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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
10 * This file is part of the SCTP kernel implementation
11 *
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
14 *
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
18 *
19 * Please send any bug reports or fixes you make to the
20 * email address(es):
21 * lksctp developers <linux-sctp@vger.kernel.org>
22 *
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
36 */
37
38#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40#include <crypto/hash.h>
41#include <linux/types.h>
42#include <linux/kernel.h>
43#include <linux/wait.h>
44#include <linux/time.h>
45#include <linux/sched/signal.h>
46#include <linux/ip.h>
47#include <linux/capability.h>
48#include <linux/fcntl.h>
49#include <linux/poll.h>
50#include <linux/init.h>
51#include <linux/slab.h>
52#include <linux/file.h>
53#include <linux/compat.h>
54#include <linux/rhashtable.h>
55
56#include <net/ip.h>
57#include <net/icmp.h>
58#include <net/route.h>
59#include <net/ipv6.h>
60#include <net/inet_common.h>
61#include <net/busy_poll.h>
62#include <trace/events/sock.h>
63
64#include <linux/socket.h> /* for sa_family_t */
65#include <linux/export.h>
66#include <net/sock.h>
67#include <net/sctp/sctp.h>
68#include <net/sctp/sm.h>
69#include <net/sctp/stream_sched.h>
70#include <net/rps.h>
71
72/* Forward declarations for internal helper functions. */
73static bool sctp_writeable(const struct sock *sk);
74static void sctp_wfree(struct sk_buff *skb);
75static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
76 size_t msg_len);
77static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
78static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
79static int sctp_wait_for_accept(struct sock *sk, long timeo);
80static void sctp_wait_for_close(struct sock *sk, long timeo);
81static void sctp_destruct_sock(struct sock *sk);
82static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
83 union sctp_addr *addr, int len);
84static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
85static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
86static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
87static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
88static int sctp_send_asconf(struct sctp_association *asoc,
89 struct sctp_chunk *chunk);
90static int sctp_do_bind(struct sock *, union sctp_addr *, int);
91static int sctp_autobind(struct sock *sk);
92static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
93 struct sctp_association *assoc,
94 enum sctp_socket_type type);
95
96static unsigned long sctp_memory_pressure;
97static atomic_long_t sctp_memory_allocated;
98static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
99struct percpu_counter sctp_sockets_allocated;
100
101static void sctp_enter_memory_pressure(struct sock *sk)
102{
103 WRITE_ONCE(sctp_memory_pressure, 1);
104}
105
106
107/* Get the sndbuf space available at the time on the association. */
108static inline int sctp_wspace(struct sctp_association *asoc)
109{
110 struct sock *sk = asoc->base.sk;
111
112 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
113 : sk_stream_wspace(sk);
114}
115
116/* Increment the used sndbuf space count of the corresponding association by
117 * the size of the outgoing data chunk.
118 * Also, set the skb destructor for sndbuf accounting later.
119 *
120 * Since it is always 1-1 between chunk and skb, and also a new skb is always
121 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
122 * destructor in the data chunk skb for the purpose of the sndbuf space
123 * tracking.
124 */
125static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
126{
127 struct sctp_association *asoc = chunk->asoc;
128 struct sock *sk = asoc->base.sk;
129
130 /* The sndbuf space is tracked per association. */
131 sctp_association_hold(asoc);
132
133 if (chunk->shkey)
134 sctp_auth_shkey_hold(chunk->shkey);
135
136 skb_set_owner_w(chunk->skb, sk);
137
138 chunk->skb->destructor = sctp_wfree;
139 /* Save the chunk pointer in skb for sctp_wfree to use later. */
140 skb_shinfo(chunk->skb)->destructor_arg = chunk;
141
142 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
143 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
144 sk_wmem_queued_add(sk, chunk->skb->truesize + sizeof(struct sctp_chunk));
145 sk_mem_charge(sk, chunk->skb->truesize);
146}
147
148static void sctp_clear_owner_w(struct sctp_chunk *chunk)
149{
150 skb_orphan(chunk->skb);
151}
152
153#define traverse_and_process() \
154do { \
155 msg = chunk->msg; \
156 if (msg == prev_msg) \
157 continue; \
158 list_for_each_entry(c, &msg->chunks, frag_list) { \
159 if ((clear && asoc->base.sk == c->skb->sk) || \
160 (!clear && asoc->base.sk != c->skb->sk)) \
161 cb(c); \
162 } \
163 prev_msg = msg; \
164} while (0)
165
166static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
167 bool clear,
168 void (*cb)(struct sctp_chunk *))
169
170{
171 struct sctp_datamsg *msg, *prev_msg = NULL;
172 struct sctp_outq *q = &asoc->outqueue;
173 struct sctp_chunk *chunk, *c;
174 struct sctp_transport *t;
175
176 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
177 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
178 traverse_and_process();
179
180 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
181 traverse_and_process();
182
183 list_for_each_entry(chunk, &q->sacked, transmitted_list)
184 traverse_and_process();
185
186 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
187 traverse_and_process();
188
189 list_for_each_entry(chunk, &q->out_chunk_list, list)
190 traverse_and_process();
191}
192
193static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
194 void (*cb)(struct sk_buff *, struct sock *))
195
196{
197 struct sk_buff *skb, *tmp;
198
199 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
200 cb(skb, sk);
201
202 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
203 cb(skb, sk);
204
205 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206 cb(skb, sk);
207}
208
209/* Verify that this is a valid address. */
210static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
211 int len)
212{
213 struct sctp_af *af;
214
215 /* Verify basic sockaddr. */
216 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217 if (!af)
218 return -EINVAL;
219
220 /* Is this a valid SCTP address? */
221 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
222 return -EINVAL;
223
224 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
225 return -EINVAL;
226
227 return 0;
228}
229
230/* Look up the association by its id. If this is not a UDP-style
231 * socket, the ID field is always ignored.
232 */
233struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
234{
235 struct sctp_association *asoc = NULL;
236
237 /* If this is not a UDP-style socket, assoc id should be ignored. */
238 if (!sctp_style(sk, UDP)) {
239 /* Return NULL if the socket state is not ESTABLISHED. It
240 * could be a TCP-style listening socket or a socket which
241 * hasn't yet called connect() to establish an association.
242 */
243 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
244 return NULL;
245
246 /* Get the first and the only association from the list. */
247 if (!list_empty(&sctp_sk(sk)->ep->asocs))
248 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
249 struct sctp_association, asocs);
250 return asoc;
251 }
252
253 /* Otherwise this is a UDP-style socket. */
254 if (id <= SCTP_ALL_ASSOC)
255 return NULL;
256
257 spin_lock_bh(&sctp_assocs_id_lock);
258 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
259 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
260 asoc = NULL;
261 spin_unlock_bh(&sctp_assocs_id_lock);
262
263 return asoc;
264}
265
266/* Look up the transport from an address and an assoc id. If both address and
267 * id are specified, the associations matching the address and the id should be
268 * the same.
269 */
270static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
271 struct sockaddr_storage *addr,
272 sctp_assoc_t id)
273{
274 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
275 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
276 union sctp_addr *laddr = (union sctp_addr *)addr;
277 struct sctp_transport *transport;
278
279 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
280 return NULL;
281
282 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
283 laddr,
284 &transport);
285
286 if (!addr_asoc)
287 return NULL;
288
289 id_asoc = sctp_id2assoc(sk, id);
290 if (id_asoc && (id_asoc != addr_asoc))
291 return NULL;
292
293 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
294 (union sctp_addr *)addr);
295
296 return transport;
297}
298
299/* API 3.1.2 bind() - UDP Style Syntax
300 * The syntax of bind() is,
301 *
302 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
303 *
304 * sd - the socket descriptor returned by socket().
305 * addr - the address structure (struct sockaddr_in or struct
306 * sockaddr_in6 [RFC 2553]),
307 * addr_len - the size of the address structure.
308 */
309static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310{
311 int retval = 0;
312
313 lock_sock(sk);
314
315 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
316 addr, addr_len);
317
318 /* Disallow binding twice. */
319 if (!sctp_sk(sk)->ep->base.bind_addr.port)
320 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
321 addr_len);
322 else
323 retval = -EINVAL;
324
325 release_sock(sk);
326
327 return retval;
328}
329
330static int sctp_get_port_local(struct sock *, union sctp_addr *);
331
332/* Verify this is a valid sockaddr. */
333static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
334 union sctp_addr *addr, int len)
335{
336 struct sctp_af *af;
337
338 /* Check minimum size. */
339 if (len < sizeof (struct sockaddr))
340 return NULL;
341
342 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
343 return NULL;
344
345 if (addr->sa.sa_family == AF_INET6) {
346 if (len < SIN6_LEN_RFC2133)
347 return NULL;
348 /* V4 mapped address are really of AF_INET family */
349 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
350 !opt->pf->af_supported(AF_INET, opt))
351 return NULL;
352 }
353
354 /* If we get this far, af is valid. */
355 af = sctp_get_af_specific(addr->sa.sa_family);
356
357 if (len < af->sockaddr_len)
358 return NULL;
359
360 return af;
361}
362
363static void sctp_auto_asconf_init(struct sctp_sock *sp)
364{
365 struct net *net = sock_net(&sp->inet.sk);
366
367 if (net->sctp.default_auto_asconf) {
368 spin_lock_bh(&net->sctp.addr_wq_lock);
369 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
370 spin_unlock_bh(&net->sctp.addr_wq_lock);
371 sp->do_auto_asconf = 1;
372 }
373}
374
375/* Bind a local address either to an endpoint or to an association. */
376static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
377{
378 struct net *net = sock_net(sk);
379 struct sctp_sock *sp = sctp_sk(sk);
380 struct sctp_endpoint *ep = sp->ep;
381 struct sctp_bind_addr *bp = &ep->base.bind_addr;
382 struct sctp_af *af;
383 unsigned short snum;
384 int ret = 0;
385
386 /* Common sockaddr verification. */
387 af = sctp_sockaddr_af(sp, addr, len);
388 if (!af) {
389 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
390 __func__, sk, addr, len);
391 return -EINVAL;
392 }
393
394 snum = ntohs(addr->v4.sin_port);
395
396 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
397 __func__, sk, &addr->sa, bp->port, snum, len);
398
399 /* PF specific bind() address verification. */
400 if (!sp->pf->bind_verify(sp, addr))
401 return -EADDRNOTAVAIL;
402
403 /* We must either be unbound, or bind to the same port.
404 * It's OK to allow 0 ports if we are already bound.
405 * We'll just inhert an already bound port in this case
406 */
407 if (bp->port) {
408 if (!snum)
409 snum = bp->port;
410 else if (snum != bp->port) {
411 pr_debug("%s: new port %d doesn't match existing port "
412 "%d\n", __func__, snum, bp->port);
413 return -EINVAL;
414 }
415 }
416
417 if (snum && inet_port_requires_bind_service(net, snum) &&
418 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
419 return -EACCES;
420
421 /* See if the address matches any of the addresses we may have
422 * already bound before checking against other endpoints.
423 */
424 if (sctp_bind_addr_match(bp, addr, sp))
425 return -EINVAL;
426
427 /* Make sure we are allowed to bind here.
428 * The function sctp_get_port_local() does duplicate address
429 * detection.
430 */
431 addr->v4.sin_port = htons(snum);
432 if (sctp_get_port_local(sk, addr))
433 return -EADDRINUSE;
434
435 /* Refresh ephemeral port. */
436 if (!bp->port) {
437 bp->port = inet_sk(sk)->inet_num;
438 sctp_auto_asconf_init(sp);
439 }
440
441 /* Add the address to the bind address list.
442 * Use GFP_ATOMIC since BHs will be disabled.
443 */
444 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
445 SCTP_ADDR_SRC, GFP_ATOMIC);
446
447 if (ret) {
448 sctp_put_port(sk);
449 return ret;
450 }
451 /* Copy back into socket for getsockname() use. */
452 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
453 sp->pf->to_sk_saddr(addr, sk);
454
455 return ret;
456}
457
458 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
459 *
460 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
461 * at any one time. If a sender, after sending an ASCONF chunk, decides
462 * it needs to transfer another ASCONF Chunk, it MUST wait until the
463 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
464 * subsequent ASCONF. Note this restriction binds each side, so at any
465 * time two ASCONF may be in-transit on any given association (one sent
466 * from each endpoint).
467 */
468static int sctp_send_asconf(struct sctp_association *asoc,
469 struct sctp_chunk *chunk)
470{
471 int retval = 0;
472
473 /* If there is an outstanding ASCONF chunk, queue it for later
474 * transmission.
475 */
476 if (asoc->addip_last_asconf) {
477 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
478 goto out;
479 }
480
481 /* Hold the chunk until an ASCONF_ACK is received. */
482 sctp_chunk_hold(chunk);
483 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
484 if (retval)
485 sctp_chunk_free(chunk);
486 else
487 asoc->addip_last_asconf = chunk;
488
489out:
490 return retval;
491}
492
493/* Add a list of addresses as bind addresses to local endpoint or
494 * association.
495 *
496 * Basically run through each address specified in the addrs/addrcnt
497 * array/length pair, determine if it is IPv6 or IPv4 and call
498 * sctp_do_bind() on it.
499 *
500 * If any of them fails, then the operation will be reversed and the
501 * ones that were added will be removed.
502 *
503 * Only sctp_setsockopt_bindx() is supposed to call this function.
504 */
505static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
506{
507 int cnt;
508 int retval = 0;
509 void *addr_buf;
510 struct sockaddr *sa_addr;
511 struct sctp_af *af;
512
513 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
514 addrs, addrcnt);
515
516 addr_buf = addrs;
517 for (cnt = 0; cnt < addrcnt; cnt++) {
518 /* The list may contain either IPv4 or IPv6 address;
519 * determine the address length for walking thru the list.
520 */
521 sa_addr = addr_buf;
522 af = sctp_get_af_specific(sa_addr->sa_family);
523 if (!af) {
524 retval = -EINVAL;
525 goto err_bindx_add;
526 }
527
528 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
529 af->sockaddr_len);
530
531 addr_buf += af->sockaddr_len;
532
533err_bindx_add:
534 if (retval < 0) {
535 /* Failed. Cleanup the ones that have been added */
536 if (cnt > 0)
537 sctp_bindx_rem(sk, addrs, cnt);
538 return retval;
539 }
540 }
541
542 return retval;
543}
544
545/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
546 * associations that are part of the endpoint indicating that a list of local
547 * addresses are added to the endpoint.
548 *
549 * If any of the addresses is already in the bind address list of the
550 * association, we do not send the chunk for that association. But it will not
551 * affect other associations.
552 *
553 * Only sctp_setsockopt_bindx() is supposed to call this function.
554 */
555static int sctp_send_asconf_add_ip(struct sock *sk,
556 struct sockaddr *addrs,
557 int addrcnt)
558{
559 struct sctp_sock *sp;
560 struct sctp_endpoint *ep;
561 struct sctp_association *asoc;
562 struct sctp_bind_addr *bp;
563 struct sctp_chunk *chunk;
564 struct sctp_sockaddr_entry *laddr;
565 union sctp_addr *addr;
566 union sctp_addr saveaddr;
567 void *addr_buf;
568 struct sctp_af *af;
569 struct list_head *p;
570 int i;
571 int retval = 0;
572
573 sp = sctp_sk(sk);
574 ep = sp->ep;
575
576 if (!ep->asconf_enable)
577 return retval;
578
579 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
580 __func__, sk, addrs, addrcnt);
581
582 list_for_each_entry(asoc, &ep->asocs, asocs) {
583 if (!asoc->peer.asconf_capable)
584 continue;
585
586 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
587 continue;
588
589 if (!sctp_state(asoc, ESTABLISHED))
590 continue;
591
592 /* Check if any address in the packed array of addresses is
593 * in the bind address list of the association. If so,
594 * do not send the asconf chunk to its peer, but continue with
595 * other associations.
596 */
597 addr_buf = addrs;
598 for (i = 0; i < addrcnt; i++) {
599 addr = addr_buf;
600 af = sctp_get_af_specific(addr->v4.sin_family);
601 if (!af) {
602 retval = -EINVAL;
603 goto out;
604 }
605
606 if (sctp_assoc_lookup_laddr(asoc, addr))
607 break;
608
609 addr_buf += af->sockaddr_len;
610 }
611 if (i < addrcnt)
612 continue;
613
614 /* Use the first valid address in bind addr list of
615 * association as Address Parameter of ASCONF CHUNK.
616 */
617 bp = &asoc->base.bind_addr;
618 p = bp->address_list.next;
619 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
620 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
621 addrcnt, SCTP_PARAM_ADD_IP);
622 if (!chunk) {
623 retval = -ENOMEM;
624 goto out;
625 }
626
627 /* Add the new addresses to the bind address list with
628 * use_as_src set to 0.
629 */
630 addr_buf = addrs;
631 for (i = 0; i < addrcnt; i++) {
632 addr = addr_buf;
633 af = sctp_get_af_specific(addr->v4.sin_family);
634 memcpy(&saveaddr, addr, af->sockaddr_len);
635 retval = sctp_add_bind_addr(bp, &saveaddr,
636 sizeof(saveaddr),
637 SCTP_ADDR_NEW, GFP_ATOMIC);
638 addr_buf += af->sockaddr_len;
639 }
640 if (asoc->src_out_of_asoc_ok) {
641 struct sctp_transport *trans;
642
643 list_for_each_entry(trans,
644 &asoc->peer.transport_addr_list, transports) {
645 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
646 2*asoc->pathmtu, 4380));
647 trans->ssthresh = asoc->peer.i.a_rwnd;
648 trans->rto = asoc->rto_initial;
649 sctp_max_rto(asoc, trans);
650 trans->rtt = trans->srtt = trans->rttvar = 0;
651 /* Clear the source and route cache */
652 sctp_transport_route(trans, NULL,
653 sctp_sk(asoc->base.sk));
654 }
655 }
656 retval = sctp_send_asconf(asoc, chunk);
657 }
658
659out:
660 return retval;
661}
662
663/* Remove a list of addresses from bind addresses list. Do not remove the
664 * last address.
665 *
666 * Basically run through each address specified in the addrs/addrcnt
667 * array/length pair, determine if it is IPv6 or IPv4 and call
668 * sctp_del_bind() on it.
669 *
670 * If any of them fails, then the operation will be reversed and the
671 * ones that were removed will be added back.
672 *
673 * At least one address has to be left; if only one address is
674 * available, the operation will return -EBUSY.
675 *
676 * Only sctp_setsockopt_bindx() is supposed to call this function.
677 */
678static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
679{
680 struct sctp_sock *sp = sctp_sk(sk);
681 struct sctp_endpoint *ep = sp->ep;
682 int cnt;
683 struct sctp_bind_addr *bp = &ep->base.bind_addr;
684 int retval = 0;
685 void *addr_buf;
686 union sctp_addr *sa_addr;
687 struct sctp_af *af;
688
689 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
690 __func__, sk, addrs, addrcnt);
691
692 addr_buf = addrs;
693 for (cnt = 0; cnt < addrcnt; cnt++) {
694 /* If the bind address list is empty or if there is only one
695 * bind address, there is nothing more to be removed (we need
696 * at least one address here).
697 */
698 if (list_empty(&bp->address_list) ||
699 (sctp_list_single_entry(&bp->address_list))) {
700 retval = -EBUSY;
701 goto err_bindx_rem;
702 }
703
704 sa_addr = addr_buf;
705 af = sctp_get_af_specific(sa_addr->sa.sa_family);
706 if (!af) {
707 retval = -EINVAL;
708 goto err_bindx_rem;
709 }
710
711 if (!af->addr_valid(sa_addr, sp, NULL)) {
712 retval = -EADDRNOTAVAIL;
713 goto err_bindx_rem;
714 }
715
716 if (sa_addr->v4.sin_port &&
717 sa_addr->v4.sin_port != htons(bp->port)) {
718 retval = -EINVAL;
719 goto err_bindx_rem;
720 }
721
722 if (!sa_addr->v4.sin_port)
723 sa_addr->v4.sin_port = htons(bp->port);
724
725 /* FIXME - There is probably a need to check if sk->sk_saddr and
726 * sk->sk_rcv_addr are currently set to one of the addresses to
727 * be removed. This is something which needs to be looked into
728 * when we are fixing the outstanding issues with multi-homing
729 * socket routing and failover schemes. Refer to comments in
730 * sctp_do_bind(). -daisy
731 */
732 retval = sctp_del_bind_addr(bp, sa_addr);
733
734 addr_buf += af->sockaddr_len;
735err_bindx_rem:
736 if (retval < 0) {
737 /* Failed. Add the ones that has been removed back */
738 if (cnt > 0)
739 sctp_bindx_add(sk, addrs, cnt);
740 return retval;
741 }
742 }
743
744 return retval;
745}
746
747/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
748 * the associations that are part of the endpoint indicating that a list of
749 * local addresses are removed from the endpoint.
750 *
751 * If any of the addresses is already in the bind address list of the
752 * association, we do not send the chunk for that association. But it will not
753 * affect other associations.
754 *
755 * Only sctp_setsockopt_bindx() is supposed to call this function.
756 */
757static int sctp_send_asconf_del_ip(struct sock *sk,
758 struct sockaddr *addrs,
759 int addrcnt)
760{
761 struct sctp_sock *sp;
762 struct sctp_endpoint *ep;
763 struct sctp_association *asoc;
764 struct sctp_transport *transport;
765 struct sctp_bind_addr *bp;
766 struct sctp_chunk *chunk;
767 union sctp_addr *laddr;
768 void *addr_buf;
769 struct sctp_af *af;
770 struct sctp_sockaddr_entry *saddr;
771 int i;
772 int retval = 0;
773 int stored = 0;
774
775 chunk = NULL;
776 sp = sctp_sk(sk);
777 ep = sp->ep;
778
779 if (!ep->asconf_enable)
780 return retval;
781
782 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
783 __func__, sk, addrs, addrcnt);
784
785 list_for_each_entry(asoc, &ep->asocs, asocs) {
786
787 if (!asoc->peer.asconf_capable)
788 continue;
789
790 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791 continue;
792
793 if (!sctp_state(asoc, ESTABLISHED))
794 continue;
795
796 /* Check if any address in the packed array of addresses is
797 * not present in the bind address list of the association.
798 * If so, do not send the asconf chunk to its peer, but
799 * continue with other associations.
800 */
801 addr_buf = addrs;
802 for (i = 0; i < addrcnt; i++) {
803 laddr = addr_buf;
804 af = sctp_get_af_specific(laddr->v4.sin_family);
805 if (!af) {
806 retval = -EINVAL;
807 goto out;
808 }
809
810 if (!sctp_assoc_lookup_laddr(asoc, laddr))
811 break;
812
813 addr_buf += af->sockaddr_len;
814 }
815 if (i < addrcnt)
816 continue;
817
818 /* Find one address in the association's bind address list
819 * that is not in the packed array of addresses. This is to
820 * make sure that we do not delete all the addresses in the
821 * association.
822 */
823 bp = &asoc->base.bind_addr;
824 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
825 addrcnt, sp);
826 if ((laddr == NULL) && (addrcnt == 1)) {
827 if (asoc->asconf_addr_del_pending)
828 continue;
829 asoc->asconf_addr_del_pending =
830 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
831 if (asoc->asconf_addr_del_pending == NULL) {
832 retval = -ENOMEM;
833 goto out;
834 }
835 asoc->asconf_addr_del_pending->sa.sa_family =
836 addrs->sa_family;
837 asoc->asconf_addr_del_pending->v4.sin_port =
838 htons(bp->port);
839 if (addrs->sa_family == AF_INET) {
840 struct sockaddr_in *sin;
841
842 sin = (struct sockaddr_in *)addrs;
843 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
844 } else if (addrs->sa_family == AF_INET6) {
845 struct sockaddr_in6 *sin6;
846
847 sin6 = (struct sockaddr_in6 *)addrs;
848 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849 }
850
851 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
852 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
853 asoc->asconf_addr_del_pending);
854
855 asoc->src_out_of_asoc_ok = 1;
856 stored = 1;
857 goto skip_mkasconf;
858 }
859
860 if (laddr == NULL)
861 return -EINVAL;
862
863 /* We do not need RCU protection throughout this loop
864 * because this is done under a socket lock from the
865 * setsockopt call.
866 */
867 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
868 SCTP_PARAM_DEL_IP);
869 if (!chunk) {
870 retval = -ENOMEM;
871 goto out;
872 }
873
874skip_mkasconf:
875 /* Reset use_as_src flag for the addresses in the bind address
876 * list that are to be deleted.
877 */
878 addr_buf = addrs;
879 for (i = 0; i < addrcnt; i++) {
880 laddr = addr_buf;
881 af = sctp_get_af_specific(laddr->v4.sin_family);
882 list_for_each_entry(saddr, &bp->address_list, list) {
883 if (sctp_cmp_addr_exact(&saddr->a, laddr))
884 saddr->state = SCTP_ADDR_DEL;
885 }
886 addr_buf += af->sockaddr_len;
887 }
888
889 /* Update the route and saddr entries for all the transports
890 * as some of the addresses in the bind address list are
891 * about to be deleted and cannot be used as source addresses.
892 */
893 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
894 transports) {
895 sctp_transport_route(transport, NULL,
896 sctp_sk(asoc->base.sk));
897 }
898
899 if (stored)
900 /* We don't need to transmit ASCONF */
901 continue;
902 retval = sctp_send_asconf(asoc, chunk);
903 }
904out:
905 return retval;
906}
907
908/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
909int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
910{
911 struct sock *sk = sctp_opt2sk(sp);
912 union sctp_addr *addr;
913 struct sctp_af *af;
914
915 /* It is safe to write port space in caller. */
916 addr = &addrw->a;
917 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
918 af = sctp_get_af_specific(addr->sa.sa_family);
919 if (!af)
920 return -EINVAL;
921 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
922 return -EINVAL;
923
924 if (addrw->state == SCTP_ADDR_NEW)
925 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
926 else
927 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
928}
929
930/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
931 *
932 * API 8.1
933 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
934 * int flags);
935 *
936 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
937 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
938 * or IPv6 addresses.
939 *
940 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
941 * Section 3.1.2 for this usage.
942 *
943 * addrs is a pointer to an array of one or more socket addresses. Each
944 * address is contained in its appropriate structure (i.e. struct
945 * sockaddr_in or struct sockaddr_in6) the family of the address type
946 * must be used to distinguish the address length (note that this
947 * representation is termed a "packed array" of addresses). The caller
948 * specifies the number of addresses in the array with addrcnt.
949 *
950 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
951 * -1, and sets errno to the appropriate error code.
952 *
953 * For SCTP, the port given in each socket address must be the same, or
954 * sctp_bindx() will fail, setting errno to EINVAL.
955 *
956 * The flags parameter is formed from the bitwise OR of zero or more of
957 * the following currently defined flags:
958 *
959 * SCTP_BINDX_ADD_ADDR
960 *
961 * SCTP_BINDX_REM_ADDR
962 *
963 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
964 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
965 * addresses from the association. The two flags are mutually exclusive;
966 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
967 * not remove all addresses from an association; sctp_bindx() will
968 * reject such an attempt with EINVAL.
969 *
970 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
971 * additional addresses with an endpoint after calling bind(). Or use
972 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
973 * socket is associated with so that no new association accepted will be
974 * associated with those addresses. If the endpoint supports dynamic
975 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
976 * endpoint to send the appropriate message to the peer to change the
977 * peers address lists.
978 *
979 * Adding and removing addresses from a connected association is
980 * optional functionality. Implementations that do not support this
981 * functionality should return EOPNOTSUPP.
982 *
983 * Basically do nothing but copying the addresses from user to kernel
984 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
985 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
986 * from userspace.
987 *
988 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
989 * it.
990 *
991 * sk The sk of the socket
992 * addrs The pointer to the addresses
993 * addrssize Size of the addrs buffer
994 * op Operation to perform (add or remove, see the flags of
995 * sctp_bindx)
996 *
997 * Returns 0 if ok, <0 errno code on error.
998 */
999static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
1000 int addrs_size, int op)
1001{
1002 int err;
1003 int addrcnt = 0;
1004 int walk_size = 0;
1005 struct sockaddr *sa_addr;
1006 void *addr_buf = addrs;
1007 struct sctp_af *af;
1008
1009 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1010 __func__, sk, addr_buf, addrs_size, op);
1011
1012 if (unlikely(addrs_size <= 0))
1013 return -EINVAL;
1014
1015 /* Walk through the addrs buffer and count the number of addresses. */
1016 while (walk_size < addrs_size) {
1017 if (walk_size + sizeof(sa_family_t) > addrs_size)
1018 return -EINVAL;
1019
1020 sa_addr = addr_buf;
1021 af = sctp_get_af_specific(sa_addr->sa_family);
1022
1023 /* If the address family is not supported or if this address
1024 * causes the address buffer to overflow return EINVAL.
1025 */
1026 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1027 return -EINVAL;
1028 addrcnt++;
1029 addr_buf += af->sockaddr_len;
1030 walk_size += af->sockaddr_len;
1031 }
1032
1033 /* Do the work. */
1034 switch (op) {
1035 case SCTP_BINDX_ADD_ADDR:
1036 /* Allow security module to validate bindx addresses. */
1037 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1038 addrs, addrs_size);
1039 if (err)
1040 return err;
1041 err = sctp_bindx_add(sk, addrs, addrcnt);
1042 if (err)
1043 return err;
1044 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1045 case SCTP_BINDX_REM_ADDR:
1046 err = sctp_bindx_rem(sk, addrs, addrcnt);
1047 if (err)
1048 return err;
1049 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1050
1051 default:
1052 return -EINVAL;
1053 }
1054}
1055
1056static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1057 int addrlen)
1058{
1059 int err;
1060
1061 lock_sock(sk);
1062 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1063 release_sock(sk);
1064 return err;
1065}
1066
1067static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1068 const union sctp_addr *daddr,
1069 const struct sctp_initmsg *init,
1070 struct sctp_transport **tp)
1071{
1072 struct sctp_association *asoc;
1073 struct sock *sk = ep->base.sk;
1074 struct net *net = sock_net(sk);
1075 enum sctp_scope scope;
1076 int err;
1077
1078 if (sctp_endpoint_is_peeled_off(ep, daddr))
1079 return -EADDRNOTAVAIL;
1080
1081 if (!ep->base.bind_addr.port) {
1082 if (sctp_autobind(sk))
1083 return -EAGAIN;
1084 } else {
1085 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1086 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1087 return -EACCES;
1088 }
1089
1090 scope = sctp_scope(daddr);
1091 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1092 if (!asoc)
1093 return -ENOMEM;
1094
1095 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1096 if (err < 0)
1097 goto free;
1098
1099 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1100 if (!*tp) {
1101 err = -ENOMEM;
1102 goto free;
1103 }
1104
1105 if (!init)
1106 return 0;
1107
1108 if (init->sinit_num_ostreams) {
1109 __u16 outcnt = init->sinit_num_ostreams;
1110
1111 asoc->c.sinit_num_ostreams = outcnt;
1112 /* outcnt has been changed, need to re-init stream */
1113 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1114 if (err)
1115 goto free;
1116 }
1117
1118 if (init->sinit_max_instreams)
1119 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1120
1121 if (init->sinit_max_attempts)
1122 asoc->max_init_attempts = init->sinit_max_attempts;
1123
1124 if (init->sinit_max_init_timeo)
1125 asoc->max_init_timeo =
1126 msecs_to_jiffies(init->sinit_max_init_timeo);
1127
1128 return 0;
1129free:
1130 sctp_association_free(asoc);
1131 return err;
1132}
1133
1134static int sctp_connect_add_peer(struct sctp_association *asoc,
1135 union sctp_addr *daddr, int addr_len)
1136{
1137 struct sctp_endpoint *ep = asoc->ep;
1138 struct sctp_association *old;
1139 struct sctp_transport *t;
1140 int err;
1141
1142 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1143 if (err)
1144 return err;
1145
1146 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1147 if (old && old != asoc)
1148 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1149 : -EALREADY;
1150
1151 if (sctp_endpoint_is_peeled_off(ep, daddr))
1152 return -EADDRNOTAVAIL;
1153
1154 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1155 if (!t)
1156 return -ENOMEM;
1157
1158 return 0;
1159}
1160
1161/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1162 *
1163 * Common routine for handling connect() and sctp_connectx().
1164 * Connect will come in with just a single address.
1165 */
1166static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1167 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1168{
1169 struct sctp_sock *sp = sctp_sk(sk);
1170 struct sctp_endpoint *ep = sp->ep;
1171 struct sctp_transport *transport;
1172 struct sctp_association *asoc;
1173 void *addr_buf = kaddrs;
1174 union sctp_addr *daddr;
1175 struct sctp_af *af;
1176 int walk_size, err;
1177 long timeo;
1178
1179 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1180 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1181 return -EISCONN;
1182
1183 daddr = addr_buf;
1184 af = sctp_get_af_specific(daddr->sa.sa_family);
1185 if (!af || af->sockaddr_len > addrs_size)
1186 return -EINVAL;
1187
1188 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1189 if (err)
1190 return err;
1191
1192 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1193 if (asoc)
1194 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1195 : -EALREADY;
1196
1197 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1198 if (err)
1199 return err;
1200 asoc = transport->asoc;
1201
1202 addr_buf += af->sockaddr_len;
1203 walk_size = af->sockaddr_len;
1204 while (walk_size < addrs_size) {
1205 err = -EINVAL;
1206 if (walk_size + sizeof(sa_family_t) > addrs_size)
1207 goto out_free;
1208
1209 daddr = addr_buf;
1210 af = sctp_get_af_specific(daddr->sa.sa_family);
1211 if (!af || af->sockaddr_len + walk_size > addrs_size)
1212 goto out_free;
1213
1214 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1215 goto out_free;
1216
1217 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1218 if (err)
1219 goto out_free;
1220
1221 addr_buf += af->sockaddr_len;
1222 walk_size += af->sockaddr_len;
1223 }
1224
1225 /* In case the user of sctp_connectx() wants an association
1226 * id back, assign one now.
1227 */
1228 if (assoc_id) {
1229 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1230 if (err < 0)
1231 goto out_free;
1232 }
1233
1234 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1235 if (err < 0)
1236 goto out_free;
1237
1238 /* Initialize sk's dport and daddr for getpeername() */
1239 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1240 sp->pf->to_sk_daddr(daddr, sk);
1241 sk->sk_err = 0;
1242
1243 if (assoc_id)
1244 *assoc_id = asoc->assoc_id;
1245
1246 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1247 return sctp_wait_for_connect(asoc, &timeo);
1248
1249out_free:
1250 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251 __func__, asoc, kaddrs, err);
1252 sctp_association_free(asoc);
1253 return err;
1254}
1255
1256/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1257 *
1258 * API 8.9
1259 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1260 * sctp_assoc_t *asoc);
1261 *
1262 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1263 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1264 * or IPv6 addresses.
1265 *
1266 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1267 * Section 3.1.2 for this usage.
1268 *
1269 * addrs is a pointer to an array of one or more socket addresses. Each
1270 * address is contained in its appropriate structure (i.e. struct
1271 * sockaddr_in or struct sockaddr_in6) the family of the address type
1272 * must be used to distengish the address length (note that this
1273 * representation is termed a "packed array" of addresses). The caller
1274 * specifies the number of addresses in the array with addrcnt.
1275 *
1276 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1277 * the association id of the new association. On failure, sctp_connectx()
1278 * returns -1, and sets errno to the appropriate error code. The assoc_id
1279 * is not touched by the kernel.
1280 *
1281 * For SCTP, the port given in each socket address must be the same, or
1282 * sctp_connectx() will fail, setting errno to EINVAL.
1283 *
1284 * An application can use sctp_connectx to initiate an association with
1285 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1286 * allows a caller to specify multiple addresses at which a peer can be
1287 * reached. The way the SCTP stack uses the list of addresses to set up
1288 * the association is implementation dependent. This function only
1289 * specifies that the stack will try to make use of all the addresses in
1290 * the list when needed.
1291 *
1292 * Note that the list of addresses passed in is only used for setting up
1293 * the association. It does not necessarily equal the set of addresses
1294 * the peer uses for the resulting association. If the caller wants to
1295 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1296 * retrieve them after the association has been set up.
1297 *
1298 * Basically do nothing but copying the addresses from user to kernel
1299 * land and invoking either sctp_connectx(). This is used for tunneling
1300 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1301 *
1302 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303 * it.
1304 *
1305 * sk The sk of the socket
1306 * addrs The pointer to the addresses
1307 * addrssize Size of the addrs buffer
1308 *
1309 * Returns >=0 if ok, <0 errno code on error.
1310 */
1311static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1312 int addrs_size, sctp_assoc_t *assoc_id)
1313{
1314 int err = 0, flags = 0;
1315
1316 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1317 __func__, sk, kaddrs, addrs_size);
1318
1319 /* make sure the 1st addr's sa_family is accessible later */
1320 if (unlikely(addrs_size < sizeof(sa_family_t)))
1321 return -EINVAL;
1322
1323 /* Allow security module to validate connectx addresses. */
1324 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1325 (struct sockaddr *)kaddrs,
1326 addrs_size);
1327 if (err)
1328 return err;
1329
1330 /* in-kernel sockets don't generally have a file allocated to them
1331 * if all they do is call sock_create_kern().
1332 */
1333 if (sk->sk_socket->file)
1334 flags = sk->sk_socket->file->f_flags;
1335
1336 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1337}
1338
1339/*
1340 * This is an older interface. It's kept for backward compatibility
1341 * to the option that doesn't provide association id.
1342 */
1343static int sctp_setsockopt_connectx_old(struct sock *sk,
1344 struct sockaddr *kaddrs,
1345 int addrs_size)
1346{
1347 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1348}
1349
1350/*
1351 * New interface for the API. The since the API is done with a socket
1352 * option, to make it simple we feed back the association id is as a return
1353 * indication to the call. Error is always negative and association id is
1354 * always positive.
1355 */
1356static int sctp_setsockopt_connectx(struct sock *sk,
1357 struct sockaddr *kaddrs,
1358 int addrs_size)
1359{
1360 sctp_assoc_t assoc_id = 0;
1361 int err = 0;
1362
1363 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1364
1365 if (err)
1366 return err;
1367 else
1368 return assoc_id;
1369}
1370
1371/*
1372 * New (hopefully final) interface for the API.
1373 * We use the sctp_getaddrs_old structure so that use-space library
1374 * can avoid any unnecessary allocations. The only different part
1375 * is that we store the actual length of the address buffer into the
1376 * addrs_num structure member. That way we can re-use the existing
1377 * code.
1378 */
1379#ifdef CONFIG_COMPAT
1380struct compat_sctp_getaddrs_old {
1381 sctp_assoc_t assoc_id;
1382 s32 addr_num;
1383 compat_uptr_t addrs; /* struct sockaddr * */
1384};
1385#endif
1386
1387static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1388 char __user *optval,
1389 int __user *optlen)
1390{
1391 struct sctp_getaddrs_old param;
1392 sctp_assoc_t assoc_id = 0;
1393 struct sockaddr *kaddrs;
1394 int err = 0;
1395
1396#ifdef CONFIG_COMPAT
1397 if (in_compat_syscall()) {
1398 struct compat_sctp_getaddrs_old param32;
1399
1400 if (len < sizeof(param32))
1401 return -EINVAL;
1402 if (copy_from_user(¶m32, optval, sizeof(param32)))
1403 return -EFAULT;
1404
1405 param.assoc_id = param32.assoc_id;
1406 param.addr_num = param32.addr_num;
1407 param.addrs = compat_ptr(param32.addrs);
1408 } else
1409#endif
1410 {
1411 if (len < sizeof(param))
1412 return -EINVAL;
1413 if (copy_from_user(¶m, optval, sizeof(param)))
1414 return -EFAULT;
1415 }
1416
1417 kaddrs = memdup_user(param.addrs, param.addr_num);
1418 if (IS_ERR(kaddrs))
1419 return PTR_ERR(kaddrs);
1420
1421 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1422 kfree(kaddrs);
1423 if (err == 0 || err == -EINPROGRESS) {
1424 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1425 return -EFAULT;
1426 if (put_user(sizeof(assoc_id), optlen))
1427 return -EFAULT;
1428 }
1429
1430 return err;
1431}
1432
1433/* API 3.1.4 close() - UDP Style Syntax
1434 * Applications use close() to perform graceful shutdown (as described in
1435 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1436 * by a UDP-style socket.
1437 *
1438 * The syntax is
1439 *
1440 * ret = close(int sd);
1441 *
1442 * sd - the socket descriptor of the associations to be closed.
1443 *
1444 * To gracefully shutdown a specific association represented by the
1445 * UDP-style socket, an application should use the sendmsg() call,
1446 * passing no user data, but including the appropriate flag in the
1447 * ancillary data (see Section xxxx).
1448 *
1449 * If sd in the close() call is a branched-off socket representing only
1450 * one association, the shutdown is performed on that association only.
1451 *
1452 * 4.1.6 close() - TCP Style Syntax
1453 *
1454 * Applications use close() to gracefully close down an association.
1455 *
1456 * The syntax is:
1457 *
1458 * int close(int sd);
1459 *
1460 * sd - the socket descriptor of the association to be closed.
1461 *
1462 * After an application calls close() on a socket descriptor, no further
1463 * socket operations will succeed on that descriptor.
1464 *
1465 * API 7.1.4 SO_LINGER
1466 *
1467 * An application using the TCP-style socket can use this option to
1468 * perform the SCTP ABORT primitive. The linger option structure is:
1469 *
1470 * struct linger {
1471 * int l_onoff; // option on/off
1472 * int l_linger; // linger time
1473 * };
1474 *
1475 * To enable the option, set l_onoff to 1. If the l_linger value is set
1476 * to 0, calling close() is the same as the ABORT primitive. If the
1477 * value is set to a negative value, the setsockopt() call will return
1478 * an error. If the value is set to a positive value linger_time, the
1479 * close() can be blocked for at most linger_time ms. If the graceful
1480 * shutdown phase does not finish during this period, close() will
1481 * return but the graceful shutdown phase continues in the system.
1482 */
1483static void sctp_close(struct sock *sk, long timeout)
1484{
1485 struct net *net = sock_net(sk);
1486 struct sctp_endpoint *ep;
1487 struct sctp_association *asoc;
1488 struct list_head *pos, *temp;
1489 unsigned int data_was_unread;
1490
1491 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1492
1493 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1494 sk->sk_shutdown = SHUTDOWN_MASK;
1495 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1496
1497 ep = sctp_sk(sk)->ep;
1498
1499 /* Clean up any skbs sitting on the receive queue. */
1500 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1501 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1502
1503 /* Walk all associations on an endpoint. */
1504 list_for_each_safe(pos, temp, &ep->asocs) {
1505 asoc = list_entry(pos, struct sctp_association, asocs);
1506
1507 if (sctp_style(sk, TCP)) {
1508 /* A closed association can still be in the list if
1509 * it belongs to a TCP-style listening socket that is
1510 * not yet accepted. If so, free it. If not, send an
1511 * ABORT or SHUTDOWN based on the linger options.
1512 */
1513 if (sctp_state(asoc, CLOSED)) {
1514 sctp_association_free(asoc);
1515 continue;
1516 }
1517 }
1518
1519 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1520 !skb_queue_empty(&asoc->ulpq.reasm) ||
1521 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1522 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1523 struct sctp_chunk *chunk;
1524
1525 chunk = sctp_make_abort_user(asoc, NULL, 0);
1526 sctp_primitive_ABORT(net, asoc, chunk);
1527 } else
1528 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1529 }
1530
1531 /* On a TCP-style socket, block for at most linger_time if set. */
1532 if (sctp_style(sk, TCP) && timeout)
1533 sctp_wait_for_close(sk, timeout);
1534
1535 /* This will run the backlog queue. */
1536 release_sock(sk);
1537
1538 /* Supposedly, no process has access to the socket, but
1539 * the net layers still may.
1540 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1541 * held and that should be grabbed before socket lock.
1542 */
1543 spin_lock_bh(&net->sctp.addr_wq_lock);
1544 bh_lock_sock_nested(sk);
1545
1546 /* Hold the sock, since sk_common_release() will put sock_put()
1547 * and we have just a little more cleanup.
1548 */
1549 sock_hold(sk);
1550 sk_common_release(sk);
1551
1552 bh_unlock_sock(sk);
1553 spin_unlock_bh(&net->sctp.addr_wq_lock);
1554
1555 sock_put(sk);
1556
1557 SCTP_DBG_OBJCNT_DEC(sock);
1558}
1559
1560/* Handle EPIPE error. */
1561static int sctp_error(struct sock *sk, int flags, int err)
1562{
1563 if (err == -EPIPE)
1564 err = sock_error(sk) ? : -EPIPE;
1565 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1566 send_sig(SIGPIPE, current, 0);
1567 return err;
1568}
1569
1570/* API 3.1.3 sendmsg() - UDP Style Syntax
1571 *
1572 * An application uses sendmsg() and recvmsg() calls to transmit data to
1573 * and receive data from its peer.
1574 *
1575 * ssize_t sendmsg(int socket, const struct msghdr *message,
1576 * int flags);
1577 *
1578 * socket - the socket descriptor of the endpoint.
1579 * message - pointer to the msghdr structure which contains a single
1580 * user message and possibly some ancillary data.
1581 *
1582 * See Section 5 for complete description of the data
1583 * structures.
1584 *
1585 * flags - flags sent or received with the user message, see Section
1586 * 5 for complete description of the flags.
1587 *
1588 * Note: This function could use a rewrite especially when explicit
1589 * connect support comes in.
1590 */
1591/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1592
1593static int sctp_msghdr_parse(const struct msghdr *msg,
1594 struct sctp_cmsgs *cmsgs);
1595
1596static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1597 struct sctp_sndrcvinfo *srinfo,
1598 const struct msghdr *msg, size_t msg_len)
1599{
1600 __u16 sflags;
1601 int err;
1602
1603 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1604 return -EPIPE;
1605
1606 if (msg_len > sk->sk_sndbuf)
1607 return -EMSGSIZE;
1608
1609 memset(cmsgs, 0, sizeof(*cmsgs));
1610 err = sctp_msghdr_parse(msg, cmsgs);
1611 if (err) {
1612 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1613 return err;
1614 }
1615
1616 memset(srinfo, 0, sizeof(*srinfo));
1617 if (cmsgs->srinfo) {
1618 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1619 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1620 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1621 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1622 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1623 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1624 }
1625
1626 if (cmsgs->sinfo) {
1627 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1628 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1629 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1630 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1631 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1632 }
1633
1634 if (cmsgs->prinfo) {
1635 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1636 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1637 cmsgs->prinfo->pr_policy);
1638 }
1639
1640 sflags = srinfo->sinfo_flags;
1641 if (!sflags && msg_len)
1642 return 0;
1643
1644 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1645 return -EINVAL;
1646
1647 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1648 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1649 return -EINVAL;
1650
1651 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1652 return -EINVAL;
1653
1654 return 0;
1655}
1656
1657static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1658 struct sctp_cmsgs *cmsgs,
1659 union sctp_addr *daddr,
1660 struct sctp_transport **tp)
1661{
1662 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1663 struct sctp_association *asoc;
1664 struct cmsghdr *cmsg;
1665 __be32 flowinfo = 0;
1666 struct sctp_af *af;
1667 int err;
1668
1669 *tp = NULL;
1670
1671 if (sflags & (SCTP_EOF | SCTP_ABORT))
1672 return -EINVAL;
1673
1674 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1675 sctp_sstate(sk, CLOSING)))
1676 return -EADDRNOTAVAIL;
1677
1678 /* Label connection socket for first association 1-to-many
1679 * style for client sequence socket()->sendmsg(). This
1680 * needs to be done before sctp_assoc_add_peer() as that will
1681 * set up the initial packet that needs to account for any
1682 * security ip options (CIPSO/CALIPSO) added to the packet.
1683 */
1684 af = sctp_get_af_specific(daddr->sa.sa_family);
1685 if (!af)
1686 return -EINVAL;
1687 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1688 (struct sockaddr *)daddr,
1689 af->sockaddr_len);
1690 if (err < 0)
1691 return err;
1692
1693 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1694 if (err)
1695 return err;
1696 asoc = (*tp)->asoc;
1697
1698 if (!cmsgs->addrs_msg)
1699 return 0;
1700
1701 if (daddr->sa.sa_family == AF_INET6)
1702 flowinfo = daddr->v6.sin6_flowinfo;
1703
1704 /* sendv addr list parse */
1705 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1706 union sctp_addr _daddr;
1707 int dlen;
1708
1709 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1710 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1711 cmsg->cmsg_type != SCTP_DSTADDRV6))
1712 continue;
1713
1714 daddr = &_daddr;
1715 memset(daddr, 0, sizeof(*daddr));
1716 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1717 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1718 if (dlen < sizeof(struct in_addr)) {
1719 err = -EINVAL;
1720 goto free;
1721 }
1722
1723 dlen = sizeof(struct in_addr);
1724 daddr->v4.sin_family = AF_INET;
1725 daddr->v4.sin_port = htons(asoc->peer.port);
1726 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1727 } else {
1728 if (dlen < sizeof(struct in6_addr)) {
1729 err = -EINVAL;
1730 goto free;
1731 }
1732
1733 dlen = sizeof(struct in6_addr);
1734 daddr->v6.sin6_flowinfo = flowinfo;
1735 daddr->v6.sin6_family = AF_INET6;
1736 daddr->v6.sin6_port = htons(asoc->peer.port);
1737 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1738 }
1739
1740 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1741 if (err)
1742 goto free;
1743 }
1744
1745 return 0;
1746
1747free:
1748 sctp_association_free(asoc);
1749 return err;
1750}
1751
1752static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1753 __u16 sflags, struct msghdr *msg,
1754 size_t msg_len)
1755{
1756 struct sock *sk = asoc->base.sk;
1757 struct net *net = sock_net(sk);
1758
1759 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1760 return -EPIPE;
1761
1762 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1763 !sctp_state(asoc, ESTABLISHED))
1764 return 0;
1765
1766 if (sflags & SCTP_EOF) {
1767 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1768 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1769
1770 return 0;
1771 }
1772
1773 if (sflags & SCTP_ABORT) {
1774 struct sctp_chunk *chunk;
1775
1776 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1777 if (!chunk)
1778 return -ENOMEM;
1779
1780 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1781 sctp_primitive_ABORT(net, asoc, chunk);
1782 iov_iter_revert(&msg->msg_iter, msg_len);
1783
1784 return 0;
1785 }
1786
1787 return 1;
1788}
1789
1790static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1791 struct msghdr *msg, size_t msg_len,
1792 struct sctp_transport *transport,
1793 struct sctp_sndrcvinfo *sinfo)
1794{
1795 struct sock *sk = asoc->base.sk;
1796 struct sctp_sock *sp = sctp_sk(sk);
1797 struct net *net = sock_net(sk);
1798 struct sctp_datamsg *datamsg;
1799 bool wait_connect = false;
1800 struct sctp_chunk *chunk;
1801 long timeo;
1802 int err;
1803
1804 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1805 err = -EINVAL;
1806 goto err;
1807 }
1808
1809 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1810 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1811 if (err)
1812 goto err;
1813 }
1814
1815 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1816 err = -EMSGSIZE;
1817 goto err;
1818 }
1819
1820 if (asoc->pmtu_pending) {
1821 if (sp->param_flags & SPP_PMTUD_ENABLE)
1822 sctp_assoc_sync_pmtu(asoc);
1823 asoc->pmtu_pending = 0;
1824 }
1825
1826 if (sctp_wspace(asoc) < (int)msg_len)
1827 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1828
1829 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1830 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1831 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1832 if (err)
1833 goto err;
1834 if (unlikely(sinfo->sinfo_stream >= asoc->stream.outcnt)) {
1835 err = -EINVAL;
1836 goto err;
1837 }
1838 }
1839
1840 if (sctp_state(asoc, CLOSED)) {
1841 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1842 if (err)
1843 goto err;
1844
1845 if (asoc->ep->intl_enable) {
1846 timeo = sock_sndtimeo(sk, 0);
1847 err = sctp_wait_for_connect(asoc, &timeo);
1848 if (err) {
1849 err = -ESRCH;
1850 goto err;
1851 }
1852 } else {
1853 wait_connect = true;
1854 }
1855
1856 pr_debug("%s: we associated primitively\n", __func__);
1857 }
1858
1859 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1860 if (IS_ERR(datamsg)) {
1861 err = PTR_ERR(datamsg);
1862 goto err;
1863 }
1864
1865 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1866
1867 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1868 sctp_chunk_hold(chunk);
1869 sctp_set_owner_w(chunk);
1870 chunk->transport = transport;
1871 }
1872
1873 err = sctp_primitive_SEND(net, asoc, datamsg);
1874 if (err) {
1875 sctp_datamsg_free(datamsg);
1876 goto err;
1877 }
1878
1879 pr_debug("%s: we sent primitively\n", __func__);
1880
1881 sctp_datamsg_put(datamsg);
1882
1883 if (unlikely(wait_connect)) {
1884 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1885 sctp_wait_for_connect(asoc, &timeo);
1886 }
1887
1888 err = msg_len;
1889
1890err:
1891 return err;
1892}
1893
1894static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1895 const struct msghdr *msg,
1896 struct sctp_cmsgs *cmsgs)
1897{
1898 union sctp_addr *daddr = NULL;
1899 int err;
1900
1901 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1902 int len = msg->msg_namelen;
1903
1904 if (len > sizeof(*daddr))
1905 len = sizeof(*daddr);
1906
1907 daddr = (union sctp_addr *)msg->msg_name;
1908
1909 err = sctp_verify_addr(sk, daddr, len);
1910 if (err)
1911 return ERR_PTR(err);
1912 }
1913
1914 return daddr;
1915}
1916
1917static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1918 struct sctp_sndrcvinfo *sinfo,
1919 struct sctp_cmsgs *cmsgs)
1920{
1921 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1922 sinfo->sinfo_stream = asoc->default_stream;
1923 sinfo->sinfo_ppid = asoc->default_ppid;
1924 sinfo->sinfo_context = asoc->default_context;
1925 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1926
1927 if (!cmsgs->prinfo)
1928 sinfo->sinfo_flags = asoc->default_flags;
1929 }
1930
1931 if (!cmsgs->srinfo && !cmsgs->prinfo)
1932 sinfo->sinfo_timetolive = asoc->default_timetolive;
1933
1934 if (cmsgs->authinfo) {
1935 /* Reuse sinfo_tsn to indicate that authinfo was set and
1936 * sinfo_ssn to save the keyid on tx path.
1937 */
1938 sinfo->sinfo_tsn = 1;
1939 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1940 }
1941}
1942
1943static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1944{
1945 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1946 struct sctp_transport *transport = NULL;
1947 struct sctp_sndrcvinfo _sinfo, *sinfo;
1948 struct sctp_association *asoc, *tmp;
1949 struct sctp_cmsgs cmsgs;
1950 union sctp_addr *daddr;
1951 bool new = false;
1952 __u16 sflags;
1953 int err;
1954
1955 /* Parse and get snd_info */
1956 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1957 if (err)
1958 goto out;
1959
1960 sinfo = &_sinfo;
1961 sflags = sinfo->sinfo_flags;
1962
1963 /* Get daddr from msg */
1964 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1965 if (IS_ERR(daddr)) {
1966 err = PTR_ERR(daddr);
1967 goto out;
1968 }
1969
1970 lock_sock(sk);
1971
1972 /* SCTP_SENDALL process */
1973 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1974 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1975 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1976 msg_len);
1977 if (err == 0)
1978 continue;
1979 if (err < 0)
1980 goto out_unlock;
1981
1982 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1983
1984 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1985 NULL, sinfo);
1986 if (err < 0)
1987 goto out_unlock;
1988
1989 iov_iter_revert(&msg->msg_iter, err);
1990 }
1991
1992 goto out_unlock;
1993 }
1994
1995 /* Get and check or create asoc */
1996 if (daddr) {
1997 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1998 if (asoc) {
1999 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2000 msg_len);
2001 if (err <= 0)
2002 goto out_unlock;
2003 } else {
2004 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2005 &transport);
2006 if (err)
2007 goto out_unlock;
2008
2009 asoc = transport->asoc;
2010 new = true;
2011 }
2012
2013 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2014 transport = NULL;
2015 } else {
2016 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2017 if (!asoc) {
2018 err = -EPIPE;
2019 goto out_unlock;
2020 }
2021
2022 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2023 if (err <= 0)
2024 goto out_unlock;
2025 }
2026
2027 /* Update snd_info with the asoc */
2028 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2029
2030 /* Send msg to the asoc */
2031 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2032 if (err < 0 && err != -ESRCH && new)
2033 sctp_association_free(asoc);
2034
2035out_unlock:
2036 release_sock(sk);
2037out:
2038 return sctp_error(sk, msg->msg_flags, err);
2039}
2040
2041/* This is an extended version of skb_pull() that removes the data from the
2042 * start of a skb even when data is spread across the list of skb's in the
2043 * frag_list. len specifies the total amount of data that needs to be removed.
2044 * when 'len' bytes could be removed from the skb, it returns 0.
2045 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2046 * could not be removed.
2047 */
2048static int sctp_skb_pull(struct sk_buff *skb, int len)
2049{
2050 struct sk_buff *list;
2051 int skb_len = skb_headlen(skb);
2052 int rlen;
2053
2054 if (len <= skb_len) {
2055 __skb_pull(skb, len);
2056 return 0;
2057 }
2058 len -= skb_len;
2059 __skb_pull(skb, skb_len);
2060
2061 skb_walk_frags(skb, list) {
2062 rlen = sctp_skb_pull(list, len);
2063 skb->len -= (len-rlen);
2064 skb->data_len -= (len-rlen);
2065
2066 if (!rlen)
2067 return 0;
2068
2069 len = rlen;
2070 }
2071
2072 return len;
2073}
2074
2075/* API 3.1.3 recvmsg() - UDP Style Syntax
2076 *
2077 * ssize_t recvmsg(int socket, struct msghdr *message,
2078 * int flags);
2079 *
2080 * socket - the socket descriptor of the endpoint.
2081 * message - pointer to the msghdr structure which contains a single
2082 * user message and possibly some ancillary data.
2083 *
2084 * See Section 5 for complete description of the data
2085 * structures.
2086 *
2087 * flags - flags sent or received with the user message, see Section
2088 * 5 for complete description of the flags.
2089 */
2090static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2091 int flags, int *addr_len)
2092{
2093 struct sctp_ulpevent *event = NULL;
2094 struct sctp_sock *sp = sctp_sk(sk);
2095 struct sk_buff *skb, *head_skb;
2096 int copied;
2097 int err = 0;
2098 int skb_len;
2099
2100 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2101 __func__, sk, msg, len, flags, addr_len);
2102
2103 if (unlikely(flags & MSG_ERRQUEUE))
2104 return inet_recv_error(sk, msg, len, addr_len);
2105
2106 if (sk_can_busy_loop(sk) &&
2107 skb_queue_empty_lockless(&sk->sk_receive_queue))
2108 sk_busy_loop(sk, flags & MSG_DONTWAIT);
2109
2110 lock_sock(sk);
2111
2112 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2113 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2114 err = -ENOTCONN;
2115 goto out;
2116 }
2117
2118 skb = sctp_skb_recv_datagram(sk, flags, &err);
2119 if (!skb)
2120 goto out;
2121
2122 /* Get the total length of the skb including any skb's in the
2123 * frag_list.
2124 */
2125 skb_len = skb->len;
2126
2127 copied = skb_len;
2128 if (copied > len)
2129 copied = len;
2130
2131 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2132
2133 event = sctp_skb2event(skb);
2134
2135 if (err)
2136 goto out_free;
2137
2138 if (event->chunk && event->chunk->head_skb)
2139 head_skb = event->chunk->head_skb;
2140 else
2141 head_skb = skb;
2142 sock_recv_cmsgs(msg, sk, head_skb);
2143 if (sctp_ulpevent_is_notification(event)) {
2144 msg->msg_flags |= MSG_NOTIFICATION;
2145 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2146 } else {
2147 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2148 }
2149
2150 /* Check if we allow SCTP_NXTINFO. */
2151 if (sp->recvnxtinfo)
2152 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2153 /* Check if we allow SCTP_RCVINFO. */
2154 if (sp->recvrcvinfo)
2155 sctp_ulpevent_read_rcvinfo(event, msg);
2156 /* Check if we allow SCTP_SNDRCVINFO. */
2157 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2158 sctp_ulpevent_read_sndrcvinfo(event, msg);
2159
2160 err = copied;
2161
2162 /* If skb's length exceeds the user's buffer, update the skb and
2163 * push it back to the receive_queue so that the next call to
2164 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2165 */
2166 if (skb_len > copied) {
2167 msg->msg_flags &= ~MSG_EOR;
2168 if (flags & MSG_PEEK)
2169 goto out_free;
2170 sctp_skb_pull(skb, copied);
2171 skb_queue_head(&sk->sk_receive_queue, skb);
2172
2173 /* When only partial message is copied to the user, increase
2174 * rwnd by that amount. If all the data in the skb is read,
2175 * rwnd is updated when the event is freed.
2176 */
2177 if (!sctp_ulpevent_is_notification(event))
2178 sctp_assoc_rwnd_increase(event->asoc, copied);
2179 goto out;
2180 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2181 (event->msg_flags & MSG_EOR))
2182 msg->msg_flags |= MSG_EOR;
2183 else
2184 msg->msg_flags &= ~MSG_EOR;
2185
2186out_free:
2187 if (flags & MSG_PEEK) {
2188 /* Release the skb reference acquired after peeking the skb in
2189 * sctp_skb_recv_datagram().
2190 */
2191 kfree_skb(skb);
2192 } else {
2193 /* Free the event which includes releasing the reference to
2194 * the owner of the skb, freeing the skb and updating the
2195 * rwnd.
2196 */
2197 sctp_ulpevent_free(event);
2198 }
2199out:
2200 release_sock(sk);
2201 return err;
2202}
2203
2204/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2205 *
2206 * This option is a on/off flag. If enabled no SCTP message
2207 * fragmentation will be performed. Instead if a message being sent
2208 * exceeds the current PMTU size, the message will NOT be sent and
2209 * instead a error will be indicated to the user.
2210 */
2211static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2212 unsigned int optlen)
2213{
2214 if (optlen < sizeof(int))
2215 return -EINVAL;
2216 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2217 return 0;
2218}
2219
2220static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2221 unsigned int optlen)
2222{
2223 struct sctp_sock *sp = sctp_sk(sk);
2224 struct sctp_association *asoc;
2225 int i;
2226
2227 if (optlen > sizeof(struct sctp_event_subscribe))
2228 return -EINVAL;
2229
2230 for (i = 0; i < optlen; i++)
2231 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2232 sn_type[i]);
2233
2234 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2235 asoc->subscribe = sctp_sk(sk)->subscribe;
2236
2237 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2238 * if there is no data to be sent or retransmit, the stack will
2239 * immediately send up this notification.
2240 */
2241 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2242 struct sctp_ulpevent *event;
2243
2244 asoc = sctp_id2assoc(sk, 0);
2245 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2246 event = sctp_ulpevent_make_sender_dry_event(asoc,
2247 GFP_USER | __GFP_NOWARN);
2248 if (!event)
2249 return -ENOMEM;
2250
2251 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2252 }
2253 }
2254
2255 return 0;
2256}
2257
2258/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2259 *
2260 * This socket option is applicable to the UDP-style socket only. When
2261 * set it will cause associations that are idle for more than the
2262 * specified number of seconds to automatically close. An association
2263 * being idle is defined an association that has NOT sent or received
2264 * user data. The special value of '0' indicates that no automatic
2265 * close of any associations should be performed. The option expects an
2266 * integer defining the number of seconds of idle time before an
2267 * association is closed.
2268 */
2269static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2270 unsigned int optlen)
2271{
2272 struct sctp_sock *sp = sctp_sk(sk);
2273 struct net *net = sock_net(sk);
2274
2275 /* Applicable to UDP-style socket only */
2276 if (sctp_style(sk, TCP))
2277 return -EOPNOTSUPP;
2278 if (optlen != sizeof(int))
2279 return -EINVAL;
2280
2281 sp->autoclose = *optval;
2282 if (sp->autoclose > net->sctp.max_autoclose)
2283 sp->autoclose = net->sctp.max_autoclose;
2284
2285 return 0;
2286}
2287
2288/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2289 *
2290 * Applications can enable or disable heartbeats for any peer address of
2291 * an association, modify an address's heartbeat interval, force a
2292 * heartbeat to be sent immediately, and adjust the address's maximum
2293 * number of retransmissions sent before an address is considered
2294 * unreachable. The following structure is used to access and modify an
2295 * address's parameters:
2296 *
2297 * struct sctp_paddrparams {
2298 * sctp_assoc_t spp_assoc_id;
2299 * struct sockaddr_storage spp_address;
2300 * uint32_t spp_hbinterval;
2301 * uint16_t spp_pathmaxrxt;
2302 * uint32_t spp_pathmtu;
2303 * uint32_t spp_sackdelay;
2304 * uint32_t spp_flags;
2305 * uint32_t spp_ipv6_flowlabel;
2306 * uint8_t spp_dscp;
2307 * };
2308 *
2309 * spp_assoc_id - (one-to-many style socket) This is filled in the
2310 * application, and identifies the association for
2311 * this query.
2312 * spp_address - This specifies which address is of interest.
2313 * spp_hbinterval - This contains the value of the heartbeat interval,
2314 * in milliseconds. If a value of zero
2315 * is present in this field then no changes are to
2316 * be made to this parameter.
2317 * spp_pathmaxrxt - This contains the maximum number of
2318 * retransmissions before this address shall be
2319 * considered unreachable. If a value of zero
2320 * is present in this field then no changes are to
2321 * be made to this parameter.
2322 * spp_pathmtu - When Path MTU discovery is disabled the value
2323 * specified here will be the "fixed" path mtu.
2324 * Note that if the spp_address field is empty
2325 * then all associations on this address will
2326 * have this fixed path mtu set upon them.
2327 *
2328 * spp_sackdelay - When delayed sack is enabled, this value specifies
2329 * the number of milliseconds that sacks will be delayed
2330 * for. This value will apply to all addresses of an
2331 * association if the spp_address field is empty. Note
2332 * also, that if delayed sack is enabled and this
2333 * value is set to 0, no change is made to the last
2334 * recorded delayed sack timer value.
2335 *
2336 * spp_flags - These flags are used to control various features
2337 * on an association. The flag field may contain
2338 * zero or more of the following options.
2339 *
2340 * SPP_HB_ENABLE - Enable heartbeats on the
2341 * specified address. Note that if the address
2342 * field is empty all addresses for the association
2343 * have heartbeats enabled upon them.
2344 *
2345 * SPP_HB_DISABLE - Disable heartbeats on the
2346 * speicifed address. Note that if the address
2347 * field is empty all addresses for the association
2348 * will have their heartbeats disabled. Note also
2349 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2350 * mutually exclusive, only one of these two should
2351 * be specified. Enabling both fields will have
2352 * undetermined results.
2353 *
2354 * SPP_HB_DEMAND - Request a user initiated heartbeat
2355 * to be made immediately.
2356 *
2357 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2358 * heartbeat delayis to be set to the value of 0
2359 * milliseconds.
2360 *
2361 * SPP_PMTUD_ENABLE - This field will enable PMTU
2362 * discovery upon the specified address. Note that
2363 * if the address feild is empty then all addresses
2364 * on the association are effected.
2365 *
2366 * SPP_PMTUD_DISABLE - This field will disable PMTU
2367 * discovery upon the specified address. Note that
2368 * if the address feild is empty then all addresses
2369 * on the association are effected. Not also that
2370 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2371 * exclusive. Enabling both will have undetermined
2372 * results.
2373 *
2374 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2375 * on delayed sack. The time specified in spp_sackdelay
2376 * is used to specify the sack delay for this address. Note
2377 * that if spp_address is empty then all addresses will
2378 * enable delayed sack and take on the sack delay
2379 * value specified in spp_sackdelay.
2380 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2381 * off delayed sack. If the spp_address field is blank then
2382 * delayed sack is disabled for the entire association. Note
2383 * also that this field is mutually exclusive to
2384 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2385 * results.
2386 *
2387 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2388 * setting of the IPV6 flow label value. The value is
2389 * contained in the spp_ipv6_flowlabel field.
2390 * Upon retrieval, this flag will be set to indicate that
2391 * the spp_ipv6_flowlabel field has a valid value returned.
2392 * If a specific destination address is set (in the
2393 * spp_address field), then the value returned is that of
2394 * the address. If just an association is specified (and
2395 * no address), then the association's default flow label
2396 * is returned. If neither an association nor a destination
2397 * is specified, then the socket's default flow label is
2398 * returned. For non-IPv6 sockets, this flag will be left
2399 * cleared.
2400 *
2401 * SPP_DSCP: Setting this flag enables the setting of the
2402 * Differentiated Services Code Point (DSCP) value
2403 * associated with either the association or a specific
2404 * address. The value is obtained in the spp_dscp field.
2405 * Upon retrieval, this flag will be set to indicate that
2406 * the spp_dscp field has a valid value returned. If a
2407 * specific destination address is set when called (in the
2408 * spp_address field), then that specific destination
2409 * address's DSCP value is returned. If just an association
2410 * is specified, then the association's default DSCP is
2411 * returned. If neither an association nor a destination is
2412 * specified, then the socket's default DSCP is returned.
2413 *
2414 * spp_ipv6_flowlabel
2415 * - This field is used in conjunction with the
2416 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2417 * The 20 least significant bits are used for the flow
2418 * label. This setting has precedence over any IPv6-layer
2419 * setting.
2420 *
2421 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2422 * and contains the DSCP. The 6 most significant bits are
2423 * used for the DSCP. This setting has precedence over any
2424 * IPv4- or IPv6- layer setting.
2425 */
2426static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2427 struct sctp_transport *trans,
2428 struct sctp_association *asoc,
2429 struct sctp_sock *sp,
2430 int hb_change,
2431 int pmtud_change,
2432 int sackdelay_change)
2433{
2434 int error;
2435
2436 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2437 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2438 trans->asoc, trans);
2439 if (error)
2440 return error;
2441 }
2442
2443 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2444 * this field is ignored. Note also that a value of zero indicates
2445 * the current setting should be left unchanged.
2446 */
2447 if (params->spp_flags & SPP_HB_ENABLE) {
2448
2449 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2450 * set. This lets us use 0 value when this flag
2451 * is set.
2452 */
2453 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2454 params->spp_hbinterval = 0;
2455
2456 if (params->spp_hbinterval ||
2457 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2458 if (trans) {
2459 trans->hbinterval =
2460 msecs_to_jiffies(params->spp_hbinterval);
2461 sctp_transport_reset_hb_timer(trans);
2462 } else if (asoc) {
2463 asoc->hbinterval =
2464 msecs_to_jiffies(params->spp_hbinterval);
2465 } else {
2466 sp->hbinterval = params->spp_hbinterval;
2467 }
2468 }
2469 }
2470
2471 if (hb_change) {
2472 if (trans) {
2473 trans->param_flags =
2474 (trans->param_flags & ~SPP_HB) | hb_change;
2475 } else if (asoc) {
2476 asoc->param_flags =
2477 (asoc->param_flags & ~SPP_HB) | hb_change;
2478 } else {
2479 sp->param_flags =
2480 (sp->param_flags & ~SPP_HB) | hb_change;
2481 }
2482 }
2483
2484 /* When Path MTU discovery is disabled the value specified here will
2485 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2486 * include the flag SPP_PMTUD_DISABLE for this field to have any
2487 * effect).
2488 */
2489 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2490 if (trans) {
2491 trans->pathmtu = params->spp_pathmtu;
2492 sctp_assoc_sync_pmtu(asoc);
2493 } else if (asoc) {
2494 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2495 } else {
2496 sp->pathmtu = params->spp_pathmtu;
2497 }
2498 }
2499
2500 if (pmtud_change) {
2501 if (trans) {
2502 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2503 (params->spp_flags & SPP_PMTUD_ENABLE);
2504 trans->param_flags =
2505 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2506 if (update) {
2507 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2508 sctp_assoc_sync_pmtu(asoc);
2509 }
2510 sctp_transport_pl_reset(trans);
2511 } else if (asoc) {
2512 asoc->param_flags =
2513 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2514 } else {
2515 sp->param_flags =
2516 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2517 }
2518 }
2519
2520 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2521 * value of this field is ignored. Note also that a value of zero
2522 * indicates the current setting should be left unchanged.
2523 */
2524 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2525 if (trans) {
2526 trans->sackdelay =
2527 msecs_to_jiffies(params->spp_sackdelay);
2528 } else if (asoc) {
2529 asoc->sackdelay =
2530 msecs_to_jiffies(params->spp_sackdelay);
2531 } else {
2532 sp->sackdelay = params->spp_sackdelay;
2533 }
2534 }
2535
2536 if (sackdelay_change) {
2537 if (trans) {
2538 trans->param_flags =
2539 (trans->param_flags & ~SPP_SACKDELAY) |
2540 sackdelay_change;
2541 } else if (asoc) {
2542 asoc->param_flags =
2543 (asoc->param_flags & ~SPP_SACKDELAY) |
2544 sackdelay_change;
2545 } else {
2546 sp->param_flags =
2547 (sp->param_flags & ~SPP_SACKDELAY) |
2548 sackdelay_change;
2549 }
2550 }
2551
2552 /* Note that a value of zero indicates the current setting should be
2553 left unchanged.
2554 */
2555 if (params->spp_pathmaxrxt) {
2556 if (trans) {
2557 trans->pathmaxrxt = params->spp_pathmaxrxt;
2558 } else if (asoc) {
2559 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2560 } else {
2561 sp->pathmaxrxt = params->spp_pathmaxrxt;
2562 }
2563 }
2564
2565 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2566 if (trans) {
2567 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2568 trans->flowlabel = params->spp_ipv6_flowlabel &
2569 SCTP_FLOWLABEL_VAL_MASK;
2570 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571 }
2572 } else if (asoc) {
2573 struct sctp_transport *t;
2574
2575 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2576 transports) {
2577 if (t->ipaddr.sa.sa_family != AF_INET6)
2578 continue;
2579 t->flowlabel = params->spp_ipv6_flowlabel &
2580 SCTP_FLOWLABEL_VAL_MASK;
2581 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2582 }
2583 asoc->flowlabel = params->spp_ipv6_flowlabel &
2584 SCTP_FLOWLABEL_VAL_MASK;
2585 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2586 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2587 sp->flowlabel = params->spp_ipv6_flowlabel &
2588 SCTP_FLOWLABEL_VAL_MASK;
2589 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2590 }
2591 }
2592
2593 if (params->spp_flags & SPP_DSCP) {
2594 if (trans) {
2595 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596 trans->dscp |= SCTP_DSCP_SET_MASK;
2597 } else if (asoc) {
2598 struct sctp_transport *t;
2599
2600 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2601 transports) {
2602 t->dscp = params->spp_dscp &
2603 SCTP_DSCP_VAL_MASK;
2604 t->dscp |= SCTP_DSCP_SET_MASK;
2605 }
2606 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2607 asoc->dscp |= SCTP_DSCP_SET_MASK;
2608 } else {
2609 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2610 sp->dscp |= SCTP_DSCP_SET_MASK;
2611 }
2612 }
2613
2614 return 0;
2615}
2616
2617static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2618 struct sctp_paddrparams *params,
2619 unsigned int optlen)
2620{
2621 struct sctp_transport *trans = NULL;
2622 struct sctp_association *asoc = NULL;
2623 struct sctp_sock *sp = sctp_sk(sk);
2624 int error;
2625 int hb_change, pmtud_change, sackdelay_change;
2626
2627 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2628 spp_ipv6_flowlabel), 4)) {
2629 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2630 return -EINVAL;
2631 } else if (optlen != sizeof(*params)) {
2632 return -EINVAL;
2633 }
2634
2635 /* Validate flags and value parameters. */
2636 hb_change = params->spp_flags & SPP_HB;
2637 pmtud_change = params->spp_flags & SPP_PMTUD;
2638 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2639
2640 if (hb_change == SPP_HB ||
2641 pmtud_change == SPP_PMTUD ||
2642 sackdelay_change == SPP_SACKDELAY ||
2643 params->spp_sackdelay > 500 ||
2644 (params->spp_pathmtu &&
2645 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2646 return -EINVAL;
2647
2648 /* If an address other than INADDR_ANY is specified, and
2649 * no transport is found, then the request is invalid.
2650 */
2651 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2652 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2653 params->spp_assoc_id);
2654 if (!trans)
2655 return -EINVAL;
2656 }
2657
2658 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2659 * socket is a one to many style socket, and an association
2660 * was not found, then the id was invalid.
2661 */
2662 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2663 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2664 sctp_style(sk, UDP))
2665 return -EINVAL;
2666
2667 /* Heartbeat demand can only be sent on a transport or
2668 * association, but not a socket.
2669 */
2670 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2671 return -EINVAL;
2672
2673 /* Process parameters. */
2674 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2675 hb_change, pmtud_change,
2676 sackdelay_change);
2677
2678 if (error)
2679 return error;
2680
2681 /* If changes are for association, also apply parameters to each
2682 * transport.
2683 */
2684 if (!trans && asoc) {
2685 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2686 transports) {
2687 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2688 hb_change, pmtud_change,
2689 sackdelay_change);
2690 }
2691 }
2692
2693 return 0;
2694}
2695
2696static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2697{
2698 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2699}
2700
2701static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2702{
2703 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2704}
2705
2706static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2707 struct sctp_association *asoc)
2708{
2709 struct sctp_transport *trans;
2710
2711 if (params->sack_delay) {
2712 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2713 asoc->param_flags =
2714 sctp_spp_sackdelay_enable(asoc->param_flags);
2715 }
2716 if (params->sack_freq == 1) {
2717 asoc->param_flags =
2718 sctp_spp_sackdelay_disable(asoc->param_flags);
2719 } else if (params->sack_freq > 1) {
2720 asoc->sackfreq = params->sack_freq;
2721 asoc->param_flags =
2722 sctp_spp_sackdelay_enable(asoc->param_flags);
2723 }
2724
2725 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2726 transports) {
2727 if (params->sack_delay) {
2728 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2729 trans->param_flags =
2730 sctp_spp_sackdelay_enable(trans->param_flags);
2731 }
2732 if (params->sack_freq == 1) {
2733 trans->param_flags =
2734 sctp_spp_sackdelay_disable(trans->param_flags);
2735 } else if (params->sack_freq > 1) {
2736 trans->sackfreq = params->sack_freq;
2737 trans->param_flags =
2738 sctp_spp_sackdelay_enable(trans->param_flags);
2739 }
2740 }
2741}
2742
2743/*
2744 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2745 *
2746 * This option will effect the way delayed acks are performed. This
2747 * option allows you to get or set the delayed ack time, in
2748 * milliseconds. It also allows changing the delayed ack frequency.
2749 * Changing the frequency to 1 disables the delayed sack algorithm. If
2750 * the assoc_id is 0, then this sets or gets the endpoints default
2751 * values. If the assoc_id field is non-zero, then the set or get
2752 * effects the specified association for the one to many model (the
2753 * assoc_id field is ignored by the one to one model). Note that if
2754 * sack_delay or sack_freq are 0 when setting this option, then the
2755 * current values will remain unchanged.
2756 *
2757 * struct sctp_sack_info {
2758 * sctp_assoc_t sack_assoc_id;
2759 * uint32_t sack_delay;
2760 * uint32_t sack_freq;
2761 * };
2762 *
2763 * sack_assoc_id - This parameter, indicates which association the user
2764 * is performing an action upon. Note that if this field's value is
2765 * zero then the endpoints default value is changed (effecting future
2766 * associations only).
2767 *
2768 * sack_delay - This parameter contains the number of milliseconds that
2769 * the user is requesting the delayed ACK timer be set to. Note that
2770 * this value is defined in the standard to be between 200 and 500
2771 * milliseconds.
2772 *
2773 * sack_freq - This parameter contains the number of packets that must
2774 * be received before a sack is sent without waiting for the delay
2775 * timer to expire. The default value for this is 2, setting this
2776 * value to 1 will disable the delayed sack algorithm.
2777 */
2778static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2779 struct sctp_sack_info *params)
2780{
2781 struct sctp_sock *sp = sctp_sk(sk);
2782 struct sctp_association *asoc;
2783
2784 /* Validate value parameter. */
2785 if (params->sack_delay > 500)
2786 return -EINVAL;
2787
2788 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2789 * socket is a one to many style socket, and an association
2790 * was not found, then the id was invalid.
2791 */
2792 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2793 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2794 sctp_style(sk, UDP))
2795 return -EINVAL;
2796
2797 if (asoc) {
2798 sctp_apply_asoc_delayed_ack(params, asoc);
2799
2800 return 0;
2801 }
2802
2803 if (sctp_style(sk, TCP))
2804 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2805
2806 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2807 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2808 if (params->sack_delay) {
2809 sp->sackdelay = params->sack_delay;
2810 sp->param_flags =
2811 sctp_spp_sackdelay_enable(sp->param_flags);
2812 }
2813 if (params->sack_freq == 1) {
2814 sp->param_flags =
2815 sctp_spp_sackdelay_disable(sp->param_flags);
2816 } else if (params->sack_freq > 1) {
2817 sp->sackfreq = params->sack_freq;
2818 sp->param_flags =
2819 sctp_spp_sackdelay_enable(sp->param_flags);
2820 }
2821 }
2822
2823 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2824 params->sack_assoc_id == SCTP_ALL_ASSOC)
2825 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2826 sctp_apply_asoc_delayed_ack(params, asoc);
2827
2828 return 0;
2829}
2830
2831static int sctp_setsockopt_delayed_ack(struct sock *sk,
2832 struct sctp_sack_info *params,
2833 unsigned int optlen)
2834{
2835 if (optlen == sizeof(struct sctp_assoc_value)) {
2836 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2837 struct sctp_sack_info p;
2838
2839 pr_warn_ratelimited(DEPRECATED
2840 "%s (pid %d) "
2841 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2842 "Use struct sctp_sack_info instead\n",
2843 current->comm, task_pid_nr(current));
2844
2845 p.sack_assoc_id = v->assoc_id;
2846 p.sack_delay = v->assoc_value;
2847 p.sack_freq = v->assoc_value ? 0 : 1;
2848 return __sctp_setsockopt_delayed_ack(sk, &p);
2849 }
2850
2851 if (optlen != sizeof(struct sctp_sack_info))
2852 return -EINVAL;
2853 if (params->sack_delay == 0 && params->sack_freq == 0)
2854 return 0;
2855 return __sctp_setsockopt_delayed_ack(sk, params);
2856}
2857
2858/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2859 *
2860 * Applications can specify protocol parameters for the default association
2861 * initialization. The option name argument to setsockopt() and getsockopt()
2862 * is SCTP_INITMSG.
2863 *
2864 * Setting initialization parameters is effective only on an unconnected
2865 * socket (for UDP-style sockets only future associations are effected
2866 * by the change). With TCP-style sockets, this option is inherited by
2867 * sockets derived from a listener socket.
2868 */
2869static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2870 unsigned int optlen)
2871{
2872 struct sctp_sock *sp = sctp_sk(sk);
2873
2874 if (optlen != sizeof(struct sctp_initmsg))
2875 return -EINVAL;
2876
2877 if (sinit->sinit_num_ostreams)
2878 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2879 if (sinit->sinit_max_instreams)
2880 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2881 if (sinit->sinit_max_attempts)
2882 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2883 if (sinit->sinit_max_init_timeo)
2884 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2885
2886 return 0;
2887}
2888
2889/*
2890 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2891 *
2892 * Applications that wish to use the sendto() system call may wish to
2893 * specify a default set of parameters that would normally be supplied
2894 * through the inclusion of ancillary data. This socket option allows
2895 * such an application to set the default sctp_sndrcvinfo structure.
2896 * The application that wishes to use this socket option simply passes
2897 * in to this call the sctp_sndrcvinfo structure defined in Section
2898 * 5.2.2) The input parameters accepted by this call include
2899 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2900 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2901 * to this call if the caller is using the UDP model.
2902 */
2903static int sctp_setsockopt_default_send_param(struct sock *sk,
2904 struct sctp_sndrcvinfo *info,
2905 unsigned int optlen)
2906{
2907 struct sctp_sock *sp = sctp_sk(sk);
2908 struct sctp_association *asoc;
2909
2910 if (optlen != sizeof(*info))
2911 return -EINVAL;
2912 if (info->sinfo_flags &
2913 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2914 SCTP_ABORT | SCTP_EOF))
2915 return -EINVAL;
2916
2917 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2918 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2919 sctp_style(sk, UDP))
2920 return -EINVAL;
2921
2922 if (asoc) {
2923 asoc->default_stream = info->sinfo_stream;
2924 asoc->default_flags = info->sinfo_flags;
2925 asoc->default_ppid = info->sinfo_ppid;
2926 asoc->default_context = info->sinfo_context;
2927 asoc->default_timetolive = info->sinfo_timetolive;
2928
2929 return 0;
2930 }
2931
2932 if (sctp_style(sk, TCP))
2933 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2934
2935 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2936 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2937 sp->default_stream = info->sinfo_stream;
2938 sp->default_flags = info->sinfo_flags;
2939 sp->default_ppid = info->sinfo_ppid;
2940 sp->default_context = info->sinfo_context;
2941 sp->default_timetolive = info->sinfo_timetolive;
2942 }
2943
2944 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2945 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2946 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2947 asoc->default_stream = info->sinfo_stream;
2948 asoc->default_flags = info->sinfo_flags;
2949 asoc->default_ppid = info->sinfo_ppid;
2950 asoc->default_context = info->sinfo_context;
2951 asoc->default_timetolive = info->sinfo_timetolive;
2952 }
2953 }
2954
2955 return 0;
2956}
2957
2958/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2959 * (SCTP_DEFAULT_SNDINFO)
2960 */
2961static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2962 struct sctp_sndinfo *info,
2963 unsigned int optlen)
2964{
2965 struct sctp_sock *sp = sctp_sk(sk);
2966 struct sctp_association *asoc;
2967
2968 if (optlen != sizeof(*info))
2969 return -EINVAL;
2970 if (info->snd_flags &
2971 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2972 SCTP_ABORT | SCTP_EOF))
2973 return -EINVAL;
2974
2975 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2976 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2977 sctp_style(sk, UDP))
2978 return -EINVAL;
2979
2980 if (asoc) {
2981 asoc->default_stream = info->snd_sid;
2982 asoc->default_flags = info->snd_flags;
2983 asoc->default_ppid = info->snd_ppid;
2984 asoc->default_context = info->snd_context;
2985
2986 return 0;
2987 }
2988
2989 if (sctp_style(sk, TCP))
2990 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2991
2992 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2993 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2994 sp->default_stream = info->snd_sid;
2995 sp->default_flags = info->snd_flags;
2996 sp->default_ppid = info->snd_ppid;
2997 sp->default_context = info->snd_context;
2998 }
2999
3000 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
3001 info->snd_assoc_id == SCTP_ALL_ASSOC) {
3002 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3003 asoc->default_stream = info->snd_sid;
3004 asoc->default_flags = info->snd_flags;
3005 asoc->default_ppid = info->snd_ppid;
3006 asoc->default_context = info->snd_context;
3007 }
3008 }
3009
3010 return 0;
3011}
3012
3013/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3014 *
3015 * Requests that the local SCTP stack use the enclosed peer address as
3016 * the association primary. The enclosed address must be one of the
3017 * association peer's addresses.
3018 */
3019static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3020 unsigned int optlen)
3021{
3022 struct sctp_transport *trans;
3023 struct sctp_af *af;
3024 int err;
3025
3026 if (optlen != sizeof(struct sctp_prim))
3027 return -EINVAL;
3028
3029 /* Allow security module to validate address but need address len. */
3030 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3031 if (!af)
3032 return -EINVAL;
3033
3034 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3035 (struct sockaddr *)&prim->ssp_addr,
3036 af->sockaddr_len);
3037 if (err)
3038 return err;
3039
3040 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3041 if (!trans)
3042 return -EINVAL;
3043
3044 sctp_assoc_set_primary(trans->asoc, trans);
3045
3046 return 0;
3047}
3048
3049/*
3050 * 7.1.5 SCTP_NODELAY
3051 *
3052 * Turn on/off any Nagle-like algorithm. This means that packets are
3053 * generally sent as soon as possible and no unnecessary delays are
3054 * introduced, at the cost of more packets in the network. Expects an
3055 * integer boolean flag.
3056 */
3057static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3058 unsigned int optlen)
3059{
3060 if (optlen < sizeof(int))
3061 return -EINVAL;
3062 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3063 return 0;
3064}
3065
3066/*
3067 *
3068 * 7.1.1 SCTP_RTOINFO
3069 *
3070 * The protocol parameters used to initialize and bound retransmission
3071 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3072 * and modify these parameters.
3073 * All parameters are time values, in milliseconds. A value of 0, when
3074 * modifying the parameters, indicates that the current value should not
3075 * be changed.
3076 *
3077 */
3078static int sctp_setsockopt_rtoinfo(struct sock *sk,
3079 struct sctp_rtoinfo *rtoinfo,
3080 unsigned int optlen)
3081{
3082 struct sctp_association *asoc;
3083 unsigned long rto_min, rto_max;
3084 struct sctp_sock *sp = sctp_sk(sk);
3085
3086 if (optlen != sizeof (struct sctp_rtoinfo))
3087 return -EINVAL;
3088
3089 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3090
3091 /* Set the values to the specific association */
3092 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3093 sctp_style(sk, UDP))
3094 return -EINVAL;
3095
3096 rto_max = rtoinfo->srto_max;
3097 rto_min = rtoinfo->srto_min;
3098
3099 if (rto_max)
3100 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3101 else
3102 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3103
3104 if (rto_min)
3105 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3106 else
3107 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3108
3109 if (rto_min > rto_max)
3110 return -EINVAL;
3111
3112 if (asoc) {
3113 if (rtoinfo->srto_initial != 0)
3114 asoc->rto_initial =
3115 msecs_to_jiffies(rtoinfo->srto_initial);
3116 asoc->rto_max = rto_max;
3117 asoc->rto_min = rto_min;
3118 } else {
3119 /* If there is no association or the association-id = 0
3120 * set the values to the endpoint.
3121 */
3122 if (rtoinfo->srto_initial != 0)
3123 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3124 sp->rtoinfo.srto_max = rto_max;
3125 sp->rtoinfo.srto_min = rto_min;
3126 }
3127
3128 return 0;
3129}
3130
3131/*
3132 *
3133 * 7.1.2 SCTP_ASSOCINFO
3134 *
3135 * This option is used to tune the maximum retransmission attempts
3136 * of the association.
3137 * Returns an error if the new association retransmission value is
3138 * greater than the sum of the retransmission value of the peer.
3139 * See [SCTP] for more information.
3140 *
3141 */
3142static int sctp_setsockopt_associnfo(struct sock *sk,
3143 struct sctp_assocparams *assocparams,
3144 unsigned int optlen)
3145{
3146
3147 struct sctp_association *asoc;
3148
3149 if (optlen != sizeof(struct sctp_assocparams))
3150 return -EINVAL;
3151
3152 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3153
3154 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3155 sctp_style(sk, UDP))
3156 return -EINVAL;
3157
3158 /* Set the values to the specific association */
3159 if (asoc) {
3160 if (assocparams->sasoc_asocmaxrxt != 0) {
3161 __u32 path_sum = 0;
3162 int paths = 0;
3163 struct sctp_transport *peer_addr;
3164
3165 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3166 transports) {
3167 path_sum += peer_addr->pathmaxrxt;
3168 paths++;
3169 }
3170
3171 /* Only validate asocmaxrxt if we have more than
3172 * one path/transport. We do this because path
3173 * retransmissions are only counted when we have more
3174 * then one path.
3175 */
3176 if (paths > 1 &&
3177 assocparams->sasoc_asocmaxrxt > path_sum)
3178 return -EINVAL;
3179
3180 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3181 }
3182
3183 if (assocparams->sasoc_cookie_life != 0)
3184 asoc->cookie_life =
3185 ms_to_ktime(assocparams->sasoc_cookie_life);
3186 } else {
3187 /* Set the values to the endpoint */
3188 struct sctp_sock *sp = sctp_sk(sk);
3189
3190 if (assocparams->sasoc_asocmaxrxt != 0)
3191 sp->assocparams.sasoc_asocmaxrxt =
3192 assocparams->sasoc_asocmaxrxt;
3193 if (assocparams->sasoc_cookie_life != 0)
3194 sp->assocparams.sasoc_cookie_life =
3195 assocparams->sasoc_cookie_life;
3196 }
3197 return 0;
3198}
3199
3200/*
3201 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3202 *
3203 * This socket option is a boolean flag which turns on or off mapped V4
3204 * addresses. If this option is turned on and the socket is type
3205 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3206 * If this option is turned off, then no mapping will be done of V4
3207 * addresses and a user will receive both PF_INET6 and PF_INET type
3208 * addresses on the socket.
3209 */
3210static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3211 unsigned int optlen)
3212{
3213 struct sctp_sock *sp = sctp_sk(sk);
3214
3215 if (optlen < sizeof(int))
3216 return -EINVAL;
3217 if (*val)
3218 sp->v4mapped = 1;
3219 else
3220 sp->v4mapped = 0;
3221
3222 return 0;
3223}
3224
3225/*
3226 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3227 * This option will get or set the maximum size to put in any outgoing
3228 * SCTP DATA chunk. If a message is larger than this size it will be
3229 * fragmented by SCTP into the specified size. Note that the underlying
3230 * SCTP implementation may fragment into smaller sized chunks when the
3231 * PMTU of the underlying association is smaller than the value set by
3232 * the user. The default value for this option is '0' which indicates
3233 * the user is NOT limiting fragmentation and only the PMTU will effect
3234 * SCTP's choice of DATA chunk size. Note also that values set larger
3235 * than the maximum size of an IP datagram will effectively let SCTP
3236 * control fragmentation (i.e. the same as setting this option to 0).
3237 *
3238 * The following structure is used to access and modify this parameter:
3239 *
3240 * struct sctp_assoc_value {
3241 * sctp_assoc_t assoc_id;
3242 * uint32_t assoc_value;
3243 * };
3244 *
3245 * assoc_id: This parameter is ignored for one-to-one style sockets.
3246 * For one-to-many style sockets this parameter indicates which
3247 * association the user is performing an action upon. Note that if
3248 * this field's value is zero then the endpoints default value is
3249 * changed (effecting future associations only).
3250 * assoc_value: This parameter specifies the maximum size in bytes.
3251 */
3252static int sctp_setsockopt_maxseg(struct sock *sk,
3253 struct sctp_assoc_value *params,
3254 unsigned int optlen)
3255{
3256 struct sctp_sock *sp = sctp_sk(sk);
3257 struct sctp_association *asoc;
3258 sctp_assoc_t assoc_id;
3259 int val;
3260
3261 if (optlen == sizeof(int)) {
3262 pr_warn_ratelimited(DEPRECATED
3263 "%s (pid %d) "
3264 "Use of int in maxseg socket option.\n"
3265 "Use struct sctp_assoc_value instead\n",
3266 current->comm, task_pid_nr(current));
3267 assoc_id = SCTP_FUTURE_ASSOC;
3268 val = *(int *)params;
3269 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3270 assoc_id = params->assoc_id;
3271 val = params->assoc_value;
3272 } else {
3273 return -EINVAL;
3274 }
3275
3276 asoc = sctp_id2assoc(sk, assoc_id);
3277 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3278 sctp_style(sk, UDP))
3279 return -EINVAL;
3280
3281 if (val) {
3282 int min_len, max_len;
3283 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3284 sizeof(struct sctp_data_chunk);
3285
3286 min_len = sctp_min_frag_point(sp, datasize);
3287 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3288
3289 if (val < min_len || val > max_len)
3290 return -EINVAL;
3291 }
3292
3293 if (asoc) {
3294 asoc->user_frag = val;
3295 sctp_assoc_update_frag_point(asoc);
3296 } else {
3297 sp->user_frag = val;
3298 }
3299
3300 return 0;
3301}
3302
3303
3304/*
3305 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3306 *
3307 * Requests that the peer mark the enclosed address as the association
3308 * primary. The enclosed address must be one of the association's
3309 * locally bound addresses. The following structure is used to make a
3310 * set primary request:
3311 */
3312static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3313 struct sctp_setpeerprim *prim,
3314 unsigned int optlen)
3315{
3316 struct sctp_sock *sp;
3317 struct sctp_association *asoc = NULL;
3318 struct sctp_chunk *chunk;
3319 struct sctp_af *af;
3320 int err;
3321
3322 sp = sctp_sk(sk);
3323
3324 if (!sp->ep->asconf_enable)
3325 return -EPERM;
3326
3327 if (optlen != sizeof(struct sctp_setpeerprim))
3328 return -EINVAL;
3329
3330 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3331 if (!asoc)
3332 return -EINVAL;
3333
3334 if (!asoc->peer.asconf_capable)
3335 return -EPERM;
3336
3337 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3338 return -EPERM;
3339
3340 if (!sctp_state(asoc, ESTABLISHED))
3341 return -ENOTCONN;
3342
3343 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3344 if (!af)
3345 return -EINVAL;
3346
3347 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3348 return -EADDRNOTAVAIL;
3349
3350 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3351 return -EADDRNOTAVAIL;
3352
3353 /* Allow security module to validate address. */
3354 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3355 (struct sockaddr *)&prim->sspp_addr,
3356 af->sockaddr_len);
3357 if (err)
3358 return err;
3359
3360 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3361 chunk = sctp_make_asconf_set_prim(asoc,
3362 (union sctp_addr *)&prim->sspp_addr);
3363 if (!chunk)
3364 return -ENOMEM;
3365
3366 err = sctp_send_asconf(asoc, chunk);
3367
3368 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3369
3370 return err;
3371}
3372
3373static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3374 struct sctp_setadaptation *adapt,
3375 unsigned int optlen)
3376{
3377 if (optlen != sizeof(struct sctp_setadaptation))
3378 return -EINVAL;
3379
3380 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3381
3382 return 0;
3383}
3384
3385/*
3386 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3387 *
3388 * The context field in the sctp_sndrcvinfo structure is normally only
3389 * used when a failed message is retrieved holding the value that was
3390 * sent down on the actual send call. This option allows the setting of
3391 * a default context on an association basis that will be received on
3392 * reading messages from the peer. This is especially helpful in the
3393 * one-2-many model for an application to keep some reference to an
3394 * internal state machine that is processing messages on the
3395 * association. Note that the setting of this value only effects
3396 * received messages from the peer and does not effect the value that is
3397 * saved with outbound messages.
3398 */
3399static int sctp_setsockopt_context(struct sock *sk,
3400 struct sctp_assoc_value *params,
3401 unsigned int optlen)
3402{
3403 struct sctp_sock *sp = sctp_sk(sk);
3404 struct sctp_association *asoc;
3405
3406 if (optlen != sizeof(struct sctp_assoc_value))
3407 return -EINVAL;
3408
3409 asoc = sctp_id2assoc(sk, params->assoc_id);
3410 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3411 sctp_style(sk, UDP))
3412 return -EINVAL;
3413
3414 if (asoc) {
3415 asoc->default_rcv_context = params->assoc_value;
3416
3417 return 0;
3418 }
3419
3420 if (sctp_style(sk, TCP))
3421 params->assoc_id = SCTP_FUTURE_ASSOC;
3422
3423 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3424 params->assoc_id == SCTP_ALL_ASSOC)
3425 sp->default_rcv_context = params->assoc_value;
3426
3427 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3428 params->assoc_id == SCTP_ALL_ASSOC)
3429 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3430 asoc->default_rcv_context = params->assoc_value;
3431
3432 return 0;
3433}
3434
3435/*
3436 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3437 *
3438 * This options will at a minimum specify if the implementation is doing
3439 * fragmented interleave. Fragmented interleave, for a one to many
3440 * socket, is when subsequent calls to receive a message may return
3441 * parts of messages from different associations. Some implementations
3442 * may allow you to turn this value on or off. If so, when turned off,
3443 * no fragment interleave will occur (which will cause a head of line
3444 * blocking amongst multiple associations sharing the same one to many
3445 * socket). When this option is turned on, then each receive call may
3446 * come from a different association (thus the user must receive data
3447 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3448 * association each receive belongs to.
3449 *
3450 * This option takes a boolean value. A non-zero value indicates that
3451 * fragmented interleave is on. A value of zero indicates that
3452 * fragmented interleave is off.
3453 *
3454 * Note that it is important that an implementation that allows this
3455 * option to be turned on, have it off by default. Otherwise an unaware
3456 * application using the one to many model may become confused and act
3457 * incorrectly.
3458 */
3459static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3460 unsigned int optlen)
3461{
3462 if (optlen != sizeof(int))
3463 return -EINVAL;
3464
3465 sctp_sk(sk)->frag_interleave = !!*val;
3466
3467 if (!sctp_sk(sk)->frag_interleave)
3468 sctp_sk(sk)->ep->intl_enable = 0;
3469
3470 return 0;
3471}
3472
3473/*
3474 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3475 * (SCTP_PARTIAL_DELIVERY_POINT)
3476 *
3477 * This option will set or get the SCTP partial delivery point. This
3478 * point is the size of a message where the partial delivery API will be
3479 * invoked to help free up rwnd space for the peer. Setting this to a
3480 * lower value will cause partial deliveries to happen more often. The
3481 * calls argument is an integer that sets or gets the partial delivery
3482 * point. Note also that the call will fail if the user attempts to set
3483 * this value larger than the socket receive buffer size.
3484 *
3485 * Note that any single message having a length smaller than or equal to
3486 * the SCTP partial delivery point will be delivered in one single read
3487 * call as long as the user provided buffer is large enough to hold the
3488 * message.
3489 */
3490static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3491 unsigned int optlen)
3492{
3493 if (optlen != sizeof(u32))
3494 return -EINVAL;
3495
3496 /* Note: We double the receive buffer from what the user sets
3497 * it to be, also initial rwnd is based on rcvbuf/2.
3498 */
3499 if (*val > (sk->sk_rcvbuf >> 1))
3500 return -EINVAL;
3501
3502 sctp_sk(sk)->pd_point = *val;
3503
3504 return 0; /* is this the right error code? */
3505}
3506
3507/*
3508 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3509 *
3510 * This option will allow a user to change the maximum burst of packets
3511 * that can be emitted by this association. Note that the default value
3512 * is 4, and some implementations may restrict this setting so that it
3513 * can only be lowered.
3514 *
3515 * NOTE: This text doesn't seem right. Do this on a socket basis with
3516 * future associations inheriting the socket value.
3517 */
3518static int sctp_setsockopt_maxburst(struct sock *sk,
3519 struct sctp_assoc_value *params,
3520 unsigned int optlen)
3521{
3522 struct sctp_sock *sp = sctp_sk(sk);
3523 struct sctp_association *asoc;
3524 sctp_assoc_t assoc_id;
3525 u32 assoc_value;
3526
3527 if (optlen == sizeof(int)) {
3528 pr_warn_ratelimited(DEPRECATED
3529 "%s (pid %d) "
3530 "Use of int in max_burst socket option deprecated.\n"
3531 "Use struct sctp_assoc_value instead\n",
3532 current->comm, task_pid_nr(current));
3533 assoc_id = SCTP_FUTURE_ASSOC;
3534 assoc_value = *((int *)params);
3535 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3536 assoc_id = params->assoc_id;
3537 assoc_value = params->assoc_value;
3538 } else
3539 return -EINVAL;
3540
3541 asoc = sctp_id2assoc(sk, assoc_id);
3542 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3543 return -EINVAL;
3544
3545 if (asoc) {
3546 asoc->max_burst = assoc_value;
3547
3548 return 0;
3549 }
3550
3551 if (sctp_style(sk, TCP))
3552 assoc_id = SCTP_FUTURE_ASSOC;
3553
3554 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3555 sp->max_burst = assoc_value;
3556
3557 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3558 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3559 asoc->max_burst = assoc_value;
3560
3561 return 0;
3562}
3563
3564/*
3565 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3566 *
3567 * This set option adds a chunk type that the user is requesting to be
3568 * received only in an authenticated way. Changes to the list of chunks
3569 * will only effect future associations on the socket.
3570 */
3571static int sctp_setsockopt_auth_chunk(struct sock *sk,
3572 struct sctp_authchunk *val,
3573 unsigned int optlen)
3574{
3575 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3576
3577 if (!ep->auth_enable)
3578 return -EACCES;
3579
3580 if (optlen != sizeof(struct sctp_authchunk))
3581 return -EINVAL;
3582
3583 switch (val->sauth_chunk) {
3584 case SCTP_CID_INIT:
3585 case SCTP_CID_INIT_ACK:
3586 case SCTP_CID_SHUTDOWN_COMPLETE:
3587 case SCTP_CID_AUTH:
3588 return -EINVAL;
3589 }
3590
3591 /* add this chunk id to the endpoint */
3592 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3593}
3594
3595/*
3596 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3597 *
3598 * This option gets or sets the list of HMAC algorithms that the local
3599 * endpoint requires the peer to use.
3600 */
3601static int sctp_setsockopt_hmac_ident(struct sock *sk,
3602 struct sctp_hmacalgo *hmacs,
3603 unsigned int optlen)
3604{
3605 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3606 u32 idents;
3607
3608 if (!ep->auth_enable)
3609 return -EACCES;
3610
3611 if (optlen < sizeof(struct sctp_hmacalgo))
3612 return -EINVAL;
3613 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3614 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3615
3616 idents = hmacs->shmac_num_idents;
3617 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3618 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3619 return -EINVAL;
3620
3621 return sctp_auth_ep_set_hmacs(ep, hmacs);
3622}
3623
3624/*
3625 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3626 *
3627 * This option will set a shared secret key which is used to build an
3628 * association shared key.
3629 */
3630static int sctp_setsockopt_auth_key(struct sock *sk,
3631 struct sctp_authkey *authkey,
3632 unsigned int optlen)
3633{
3634 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3635 struct sctp_association *asoc;
3636 int ret = -EINVAL;
3637
3638 if (optlen <= sizeof(struct sctp_authkey))
3639 return -EINVAL;
3640 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3641 * this.
3642 */
3643 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3644
3645 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3646 goto out;
3647
3648 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3649 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3650 sctp_style(sk, UDP))
3651 goto out;
3652
3653 if (asoc) {
3654 ret = sctp_auth_set_key(ep, asoc, authkey);
3655 goto out;
3656 }
3657
3658 if (sctp_style(sk, TCP))
3659 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3660
3661 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3662 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3663 ret = sctp_auth_set_key(ep, asoc, authkey);
3664 if (ret)
3665 goto out;
3666 }
3667
3668 ret = 0;
3669
3670 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3671 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3672 list_for_each_entry(asoc, &ep->asocs, asocs) {
3673 int res = sctp_auth_set_key(ep, asoc, authkey);
3674
3675 if (res && !ret)
3676 ret = res;
3677 }
3678 }
3679
3680out:
3681 memzero_explicit(authkey, optlen);
3682 return ret;
3683}
3684
3685/*
3686 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3687 *
3688 * This option will get or set the active shared key to be used to build
3689 * the association shared key.
3690 */
3691static int sctp_setsockopt_active_key(struct sock *sk,
3692 struct sctp_authkeyid *val,
3693 unsigned int optlen)
3694{
3695 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3696 struct sctp_association *asoc;
3697 int ret = 0;
3698
3699 if (optlen != sizeof(struct sctp_authkeyid))
3700 return -EINVAL;
3701
3702 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3703 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3704 sctp_style(sk, UDP))
3705 return -EINVAL;
3706
3707 if (asoc)
3708 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3709
3710 if (sctp_style(sk, TCP))
3711 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3712
3713 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3714 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3715 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3716 if (ret)
3717 return ret;
3718 }
3719
3720 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3721 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3722 list_for_each_entry(asoc, &ep->asocs, asocs) {
3723 int res = sctp_auth_set_active_key(ep, asoc,
3724 val->scact_keynumber);
3725
3726 if (res && !ret)
3727 ret = res;
3728 }
3729 }
3730
3731 return ret;
3732}
3733
3734/*
3735 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3736 *
3737 * This set option will delete a shared secret key from use.
3738 */
3739static int sctp_setsockopt_del_key(struct sock *sk,
3740 struct sctp_authkeyid *val,
3741 unsigned int optlen)
3742{
3743 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3744 struct sctp_association *asoc;
3745 int ret = 0;
3746
3747 if (optlen != sizeof(struct sctp_authkeyid))
3748 return -EINVAL;
3749
3750 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3751 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3752 sctp_style(sk, UDP))
3753 return -EINVAL;
3754
3755 if (asoc)
3756 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3757
3758 if (sctp_style(sk, TCP))
3759 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3760
3761 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3762 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3763 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3764 if (ret)
3765 return ret;
3766 }
3767
3768 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3769 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3770 list_for_each_entry(asoc, &ep->asocs, asocs) {
3771 int res = sctp_auth_del_key_id(ep, asoc,
3772 val->scact_keynumber);
3773
3774 if (res && !ret)
3775 ret = res;
3776 }
3777 }
3778
3779 return ret;
3780}
3781
3782/*
3783 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3784 *
3785 * This set option will deactivate a shared secret key.
3786 */
3787static int sctp_setsockopt_deactivate_key(struct sock *sk,
3788 struct sctp_authkeyid *val,
3789 unsigned int optlen)
3790{
3791 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3792 struct sctp_association *asoc;
3793 int ret = 0;
3794
3795 if (optlen != sizeof(struct sctp_authkeyid))
3796 return -EINVAL;
3797
3798 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3799 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3800 sctp_style(sk, UDP))
3801 return -EINVAL;
3802
3803 if (asoc)
3804 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3805
3806 if (sctp_style(sk, TCP))
3807 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3808
3809 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3810 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3811 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3812 if (ret)
3813 return ret;
3814 }
3815
3816 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3817 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3818 list_for_each_entry(asoc, &ep->asocs, asocs) {
3819 int res = sctp_auth_deact_key_id(ep, asoc,
3820 val->scact_keynumber);
3821
3822 if (res && !ret)
3823 ret = res;
3824 }
3825 }
3826
3827 return ret;
3828}
3829
3830/*
3831 * 8.1.23 SCTP_AUTO_ASCONF
3832 *
3833 * This option will enable or disable the use of the automatic generation of
3834 * ASCONF chunks to add and delete addresses to an existing association. Note
3835 * that this option has two caveats namely: a) it only affects sockets that
3836 * are bound to all addresses available to the SCTP stack, and b) the system
3837 * administrator may have an overriding control that turns the ASCONF feature
3838 * off no matter what setting the socket option may have.
3839 * This option expects an integer boolean flag, where a non-zero value turns on
3840 * the option, and a zero value turns off the option.
3841 * Note. In this implementation, socket operation overrides default parameter
3842 * being set by sysctl as well as FreeBSD implementation
3843 */
3844static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3845 unsigned int optlen)
3846{
3847 struct sctp_sock *sp = sctp_sk(sk);
3848
3849 if (optlen < sizeof(int))
3850 return -EINVAL;
3851 if (!sctp_is_ep_boundall(sk) && *val)
3852 return -EINVAL;
3853 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3854 return 0;
3855
3856 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3857 if (*val == 0 && sp->do_auto_asconf) {
3858 list_del(&sp->auto_asconf_list);
3859 sp->do_auto_asconf = 0;
3860 } else if (*val && !sp->do_auto_asconf) {
3861 list_add_tail(&sp->auto_asconf_list,
3862 &sock_net(sk)->sctp.auto_asconf_splist);
3863 sp->do_auto_asconf = 1;
3864 }
3865 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3866 return 0;
3867}
3868
3869/*
3870 * SCTP_PEER_ADDR_THLDS
3871 *
3872 * This option allows us to alter the partially failed threshold for one or all
3873 * transports in an association. See Section 6.1 of:
3874 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3875 */
3876static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3877 struct sctp_paddrthlds_v2 *val,
3878 unsigned int optlen, bool v2)
3879{
3880 struct sctp_transport *trans;
3881 struct sctp_association *asoc;
3882 int len;
3883
3884 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3885 if (optlen < len)
3886 return -EINVAL;
3887
3888 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3889 return -EINVAL;
3890
3891 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3892 trans = sctp_addr_id2transport(sk, &val->spt_address,
3893 val->spt_assoc_id);
3894 if (!trans)
3895 return -ENOENT;
3896
3897 if (val->spt_pathmaxrxt)
3898 trans->pathmaxrxt = val->spt_pathmaxrxt;
3899 if (v2)
3900 trans->ps_retrans = val->spt_pathcpthld;
3901 trans->pf_retrans = val->spt_pathpfthld;
3902
3903 return 0;
3904 }
3905
3906 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3907 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3908 sctp_style(sk, UDP))
3909 return -EINVAL;
3910
3911 if (asoc) {
3912 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3913 transports) {
3914 if (val->spt_pathmaxrxt)
3915 trans->pathmaxrxt = val->spt_pathmaxrxt;
3916 if (v2)
3917 trans->ps_retrans = val->spt_pathcpthld;
3918 trans->pf_retrans = val->spt_pathpfthld;
3919 }
3920
3921 if (val->spt_pathmaxrxt)
3922 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3923 if (v2)
3924 asoc->ps_retrans = val->spt_pathcpthld;
3925 asoc->pf_retrans = val->spt_pathpfthld;
3926 } else {
3927 struct sctp_sock *sp = sctp_sk(sk);
3928
3929 if (val->spt_pathmaxrxt)
3930 sp->pathmaxrxt = val->spt_pathmaxrxt;
3931 if (v2)
3932 sp->ps_retrans = val->spt_pathcpthld;
3933 sp->pf_retrans = val->spt_pathpfthld;
3934 }
3935
3936 return 0;
3937}
3938
3939static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3940 unsigned int optlen)
3941{
3942 if (optlen < sizeof(int))
3943 return -EINVAL;
3944
3945 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3946
3947 return 0;
3948}
3949
3950static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3951 unsigned int optlen)
3952{
3953 if (optlen < sizeof(int))
3954 return -EINVAL;
3955
3956 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3957
3958 return 0;
3959}
3960
3961static int sctp_setsockopt_pr_supported(struct sock *sk,
3962 struct sctp_assoc_value *params,
3963 unsigned int optlen)
3964{
3965 struct sctp_association *asoc;
3966
3967 if (optlen != sizeof(*params))
3968 return -EINVAL;
3969
3970 asoc = sctp_id2assoc(sk, params->assoc_id);
3971 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3972 sctp_style(sk, UDP))
3973 return -EINVAL;
3974
3975 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3976
3977 return 0;
3978}
3979
3980static int sctp_setsockopt_default_prinfo(struct sock *sk,
3981 struct sctp_default_prinfo *info,
3982 unsigned int optlen)
3983{
3984 struct sctp_sock *sp = sctp_sk(sk);
3985 struct sctp_association *asoc;
3986 int retval = -EINVAL;
3987
3988 if (optlen != sizeof(*info))
3989 goto out;
3990
3991 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3992 goto out;
3993
3994 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3995 info->pr_value = 0;
3996
3997 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3998 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3999 sctp_style(sk, UDP))
4000 goto out;
4001
4002 retval = 0;
4003
4004 if (asoc) {
4005 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
4006 asoc->default_timetolive = info->pr_value;
4007 goto out;
4008 }
4009
4010 if (sctp_style(sk, TCP))
4011 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4012
4013 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4014 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4015 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4016 sp->default_timetolive = info->pr_value;
4017 }
4018
4019 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4020 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4021 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4022 SCTP_PR_SET_POLICY(asoc->default_flags,
4023 info->pr_policy);
4024 asoc->default_timetolive = info->pr_value;
4025 }
4026 }
4027
4028out:
4029 return retval;
4030}
4031
4032static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4033 struct sctp_assoc_value *params,
4034 unsigned int optlen)
4035{
4036 struct sctp_association *asoc;
4037 int retval = -EINVAL;
4038
4039 if (optlen != sizeof(*params))
4040 goto out;
4041
4042 asoc = sctp_id2assoc(sk, params->assoc_id);
4043 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4044 sctp_style(sk, UDP))
4045 goto out;
4046
4047 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4048
4049 retval = 0;
4050
4051out:
4052 return retval;
4053}
4054
4055static int sctp_setsockopt_enable_strreset(struct sock *sk,
4056 struct sctp_assoc_value *params,
4057 unsigned int optlen)
4058{
4059 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4060 struct sctp_association *asoc;
4061 int retval = -EINVAL;
4062
4063 if (optlen != sizeof(*params))
4064 goto out;
4065
4066 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4067 goto out;
4068
4069 asoc = sctp_id2assoc(sk, params->assoc_id);
4070 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4071 sctp_style(sk, UDP))
4072 goto out;
4073
4074 retval = 0;
4075
4076 if (asoc) {
4077 asoc->strreset_enable = params->assoc_value;
4078 goto out;
4079 }
4080
4081 if (sctp_style(sk, TCP))
4082 params->assoc_id = SCTP_FUTURE_ASSOC;
4083
4084 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4085 params->assoc_id == SCTP_ALL_ASSOC)
4086 ep->strreset_enable = params->assoc_value;
4087
4088 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4089 params->assoc_id == SCTP_ALL_ASSOC)
4090 list_for_each_entry(asoc, &ep->asocs, asocs)
4091 asoc->strreset_enable = params->assoc_value;
4092
4093out:
4094 return retval;
4095}
4096
4097static int sctp_setsockopt_reset_streams(struct sock *sk,
4098 struct sctp_reset_streams *params,
4099 unsigned int optlen)
4100{
4101 struct sctp_association *asoc;
4102
4103 if (optlen < sizeof(*params))
4104 return -EINVAL;
4105 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4106 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4107 sizeof(__u16) * sizeof(*params));
4108
4109 if (params->srs_number_streams * sizeof(__u16) >
4110 optlen - sizeof(*params))
4111 return -EINVAL;
4112
4113 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4114 if (!asoc)
4115 return -EINVAL;
4116
4117 return sctp_send_reset_streams(asoc, params);
4118}
4119
4120static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4121 unsigned int optlen)
4122{
4123 struct sctp_association *asoc;
4124
4125 if (optlen != sizeof(*associd))
4126 return -EINVAL;
4127
4128 asoc = sctp_id2assoc(sk, *associd);
4129 if (!asoc)
4130 return -EINVAL;
4131
4132 return sctp_send_reset_assoc(asoc);
4133}
4134
4135static int sctp_setsockopt_add_streams(struct sock *sk,
4136 struct sctp_add_streams *params,
4137 unsigned int optlen)
4138{
4139 struct sctp_association *asoc;
4140
4141 if (optlen != sizeof(*params))
4142 return -EINVAL;
4143
4144 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4145 if (!asoc)
4146 return -EINVAL;
4147
4148 return sctp_send_add_streams(asoc, params);
4149}
4150
4151static int sctp_setsockopt_scheduler(struct sock *sk,
4152 struct sctp_assoc_value *params,
4153 unsigned int optlen)
4154{
4155 struct sctp_sock *sp = sctp_sk(sk);
4156 struct sctp_association *asoc;
4157 int retval = 0;
4158
4159 if (optlen < sizeof(*params))
4160 return -EINVAL;
4161
4162 if (params->assoc_value > SCTP_SS_MAX)
4163 return -EINVAL;
4164
4165 asoc = sctp_id2assoc(sk, params->assoc_id);
4166 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4167 sctp_style(sk, UDP))
4168 return -EINVAL;
4169
4170 if (asoc)
4171 return sctp_sched_set_sched(asoc, params->assoc_value);
4172
4173 if (sctp_style(sk, TCP))
4174 params->assoc_id = SCTP_FUTURE_ASSOC;
4175
4176 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4177 params->assoc_id == SCTP_ALL_ASSOC)
4178 sp->default_ss = params->assoc_value;
4179
4180 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4181 params->assoc_id == SCTP_ALL_ASSOC) {
4182 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4183 int ret = sctp_sched_set_sched(asoc,
4184 params->assoc_value);
4185
4186 if (ret && !retval)
4187 retval = ret;
4188 }
4189 }
4190
4191 return retval;
4192}
4193
4194static int sctp_setsockopt_scheduler_value(struct sock *sk,
4195 struct sctp_stream_value *params,
4196 unsigned int optlen)
4197{
4198 struct sctp_association *asoc;
4199 int retval = -EINVAL;
4200
4201 if (optlen < sizeof(*params))
4202 goto out;
4203
4204 asoc = sctp_id2assoc(sk, params->assoc_id);
4205 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4206 sctp_style(sk, UDP))
4207 goto out;
4208
4209 if (asoc) {
4210 retval = sctp_sched_set_value(asoc, params->stream_id,
4211 params->stream_value, GFP_KERNEL);
4212 goto out;
4213 }
4214
4215 retval = 0;
4216
4217 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4218 int ret = sctp_sched_set_value(asoc, params->stream_id,
4219 params->stream_value,
4220 GFP_KERNEL);
4221 if (ret && !retval) /* try to return the 1st error. */
4222 retval = ret;
4223 }
4224
4225out:
4226 return retval;
4227}
4228
4229static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4230 struct sctp_assoc_value *p,
4231 unsigned int optlen)
4232{
4233 struct sctp_sock *sp = sctp_sk(sk);
4234 struct sctp_association *asoc;
4235
4236 if (optlen < sizeof(*p))
4237 return -EINVAL;
4238
4239 asoc = sctp_id2assoc(sk, p->assoc_id);
4240 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4241 return -EINVAL;
4242
4243 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4244 return -EPERM;
4245 }
4246
4247 sp->ep->intl_enable = !!p->assoc_value;
4248 return 0;
4249}
4250
4251static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4252 unsigned int optlen)
4253{
4254 if (!sctp_style(sk, TCP))
4255 return -EOPNOTSUPP;
4256
4257 if (sctp_sk(sk)->ep->base.bind_addr.port)
4258 return -EFAULT;
4259
4260 if (optlen < sizeof(int))
4261 return -EINVAL;
4262
4263 sctp_sk(sk)->reuse = !!*val;
4264
4265 return 0;
4266}
4267
4268static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4269 struct sctp_association *asoc)
4270{
4271 struct sctp_ulpevent *event;
4272
4273 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4274
4275 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4276 if (sctp_outq_is_empty(&asoc->outqueue)) {
4277 event = sctp_ulpevent_make_sender_dry_event(asoc,
4278 GFP_USER | __GFP_NOWARN);
4279 if (!event)
4280 return -ENOMEM;
4281
4282 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4283 }
4284 }
4285
4286 return 0;
4287}
4288
4289static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4290 unsigned int optlen)
4291{
4292 struct sctp_sock *sp = sctp_sk(sk);
4293 struct sctp_association *asoc;
4294 int retval = 0;
4295
4296 if (optlen < sizeof(*param))
4297 return -EINVAL;
4298
4299 if (param->se_type < SCTP_SN_TYPE_BASE ||
4300 param->se_type > SCTP_SN_TYPE_MAX)
4301 return -EINVAL;
4302
4303 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4304 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4305 sctp_style(sk, UDP))
4306 return -EINVAL;
4307
4308 if (asoc)
4309 return sctp_assoc_ulpevent_type_set(param, asoc);
4310
4311 if (sctp_style(sk, TCP))
4312 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4313
4314 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4315 param->se_assoc_id == SCTP_ALL_ASSOC)
4316 sctp_ulpevent_type_set(&sp->subscribe,
4317 param->se_type, param->se_on);
4318
4319 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4320 param->se_assoc_id == SCTP_ALL_ASSOC) {
4321 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4322 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4323
4324 if (ret && !retval)
4325 retval = ret;
4326 }
4327 }
4328
4329 return retval;
4330}
4331
4332static int sctp_setsockopt_asconf_supported(struct sock *sk,
4333 struct sctp_assoc_value *params,
4334 unsigned int optlen)
4335{
4336 struct sctp_association *asoc;
4337 struct sctp_endpoint *ep;
4338 int retval = -EINVAL;
4339
4340 if (optlen != sizeof(*params))
4341 goto out;
4342
4343 asoc = sctp_id2assoc(sk, params->assoc_id);
4344 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4345 sctp_style(sk, UDP))
4346 goto out;
4347
4348 ep = sctp_sk(sk)->ep;
4349 ep->asconf_enable = !!params->assoc_value;
4350
4351 if (ep->asconf_enable && ep->auth_enable) {
4352 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4353 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4354 }
4355
4356 retval = 0;
4357
4358out:
4359 return retval;
4360}
4361
4362static int sctp_setsockopt_auth_supported(struct sock *sk,
4363 struct sctp_assoc_value *params,
4364 unsigned int optlen)
4365{
4366 struct sctp_association *asoc;
4367 struct sctp_endpoint *ep;
4368 int retval = -EINVAL;
4369
4370 if (optlen != sizeof(*params))
4371 goto out;
4372
4373 asoc = sctp_id2assoc(sk, params->assoc_id);
4374 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4375 sctp_style(sk, UDP))
4376 goto out;
4377
4378 ep = sctp_sk(sk)->ep;
4379 if (params->assoc_value) {
4380 retval = sctp_auth_init(ep, GFP_KERNEL);
4381 if (retval)
4382 goto out;
4383 if (ep->asconf_enable) {
4384 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4385 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4386 }
4387 }
4388
4389 ep->auth_enable = !!params->assoc_value;
4390 retval = 0;
4391
4392out:
4393 return retval;
4394}
4395
4396static int sctp_setsockopt_ecn_supported(struct sock *sk,
4397 struct sctp_assoc_value *params,
4398 unsigned int optlen)
4399{
4400 struct sctp_association *asoc;
4401 int retval = -EINVAL;
4402
4403 if (optlen != sizeof(*params))
4404 goto out;
4405
4406 asoc = sctp_id2assoc(sk, params->assoc_id);
4407 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4408 sctp_style(sk, UDP))
4409 goto out;
4410
4411 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4412 retval = 0;
4413
4414out:
4415 return retval;
4416}
4417
4418static int sctp_setsockopt_pf_expose(struct sock *sk,
4419 struct sctp_assoc_value *params,
4420 unsigned int optlen)
4421{
4422 struct sctp_association *asoc;
4423 int retval = -EINVAL;
4424
4425 if (optlen != sizeof(*params))
4426 goto out;
4427
4428 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4429 goto out;
4430
4431 asoc = sctp_id2assoc(sk, params->assoc_id);
4432 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4433 sctp_style(sk, UDP))
4434 goto out;
4435
4436 if (asoc)
4437 asoc->pf_expose = params->assoc_value;
4438 else
4439 sctp_sk(sk)->pf_expose = params->assoc_value;
4440 retval = 0;
4441
4442out:
4443 return retval;
4444}
4445
4446static int sctp_setsockopt_encap_port(struct sock *sk,
4447 struct sctp_udpencaps *encap,
4448 unsigned int optlen)
4449{
4450 struct sctp_association *asoc;
4451 struct sctp_transport *t;
4452 __be16 encap_port;
4453
4454 if (optlen != sizeof(*encap))
4455 return -EINVAL;
4456
4457 /* If an address other than INADDR_ANY is specified, and
4458 * no transport is found, then the request is invalid.
4459 */
4460 encap_port = (__force __be16)encap->sue_port;
4461 if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4462 t = sctp_addr_id2transport(sk, &encap->sue_address,
4463 encap->sue_assoc_id);
4464 if (!t)
4465 return -EINVAL;
4466
4467 t->encap_port = encap_port;
4468 return 0;
4469 }
4470
4471 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4472 * socket is a one to many style socket, and an association
4473 * was not found, then the id was invalid.
4474 */
4475 asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4476 if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4477 sctp_style(sk, UDP))
4478 return -EINVAL;
4479
4480 /* If changes are for association, also apply encap_port to
4481 * each transport.
4482 */
4483 if (asoc) {
4484 list_for_each_entry(t, &asoc->peer.transport_addr_list,
4485 transports)
4486 t->encap_port = encap_port;
4487
4488 asoc->encap_port = encap_port;
4489 return 0;
4490 }
4491
4492 sctp_sk(sk)->encap_port = encap_port;
4493 return 0;
4494}
4495
4496static int sctp_setsockopt_probe_interval(struct sock *sk,
4497 struct sctp_probeinterval *params,
4498 unsigned int optlen)
4499{
4500 struct sctp_association *asoc;
4501 struct sctp_transport *t;
4502 __u32 probe_interval;
4503
4504 if (optlen != sizeof(*params))
4505 return -EINVAL;
4506
4507 probe_interval = params->spi_interval;
4508 if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4509 return -EINVAL;
4510
4511 /* If an address other than INADDR_ANY is specified, and
4512 * no transport is found, then the request is invalid.
4513 */
4514 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spi_address)) {
4515 t = sctp_addr_id2transport(sk, ¶ms->spi_address,
4516 params->spi_assoc_id);
4517 if (!t)
4518 return -EINVAL;
4519
4520 t->probe_interval = msecs_to_jiffies(probe_interval);
4521 sctp_transport_pl_reset(t);
4522 return 0;
4523 }
4524
4525 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4526 * socket is a one to many style socket, and an association
4527 * was not found, then the id was invalid.
4528 */
4529 asoc = sctp_id2assoc(sk, params->spi_assoc_id);
4530 if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4531 sctp_style(sk, UDP))
4532 return -EINVAL;
4533
4534 /* If changes are for association, also apply probe_interval to
4535 * each transport.
4536 */
4537 if (asoc) {
4538 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4539 t->probe_interval = msecs_to_jiffies(probe_interval);
4540 sctp_transport_pl_reset(t);
4541 }
4542
4543 asoc->probe_interval = msecs_to_jiffies(probe_interval);
4544 return 0;
4545 }
4546
4547 sctp_sk(sk)->probe_interval = probe_interval;
4548 return 0;
4549}
4550
4551/* API 6.2 setsockopt(), getsockopt()
4552 *
4553 * Applications use setsockopt() and getsockopt() to set or retrieve
4554 * socket options. Socket options are used to change the default
4555 * behavior of sockets calls. They are described in Section 7.
4556 *
4557 * The syntax is:
4558 *
4559 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4560 * int __user *optlen);
4561 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4562 * int optlen);
4563 *
4564 * sd - the socket descript.
4565 * level - set to IPPROTO_SCTP for all SCTP options.
4566 * optname - the option name.
4567 * optval - the buffer to store the value of the option.
4568 * optlen - the size of the buffer.
4569 */
4570static int sctp_setsockopt(struct sock *sk, int level, int optname,
4571 sockptr_t optval, unsigned int optlen)
4572{
4573 void *kopt = NULL;
4574 int retval = 0;
4575
4576 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4577
4578 /* I can hardly begin to describe how wrong this is. This is
4579 * so broken as to be worse than useless. The API draft
4580 * REALLY is NOT helpful here... I am not convinced that the
4581 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4582 * are at all well-founded.
4583 */
4584 if (level != SOL_SCTP) {
4585 struct sctp_af *af = sctp_sk(sk)->pf->af;
4586
4587 return af->setsockopt(sk, level, optname, optval, optlen);
4588 }
4589
4590 if (optlen > 0) {
4591 /* Trim it to the biggest size sctp sockopt may need if necessary */
4592 optlen = min_t(unsigned int, optlen,
4593 PAGE_ALIGN(USHRT_MAX +
4594 sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4595 kopt = memdup_sockptr(optval, optlen);
4596 if (IS_ERR(kopt))
4597 return PTR_ERR(kopt);
4598 }
4599
4600 lock_sock(sk);
4601
4602 switch (optname) {
4603 case SCTP_SOCKOPT_BINDX_ADD:
4604 /* 'optlen' is the size of the addresses buffer. */
4605 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4606 SCTP_BINDX_ADD_ADDR);
4607 break;
4608
4609 case SCTP_SOCKOPT_BINDX_REM:
4610 /* 'optlen' is the size of the addresses buffer. */
4611 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4612 SCTP_BINDX_REM_ADDR);
4613 break;
4614
4615 case SCTP_SOCKOPT_CONNECTX_OLD:
4616 /* 'optlen' is the size of the addresses buffer. */
4617 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4618 break;
4619
4620 case SCTP_SOCKOPT_CONNECTX:
4621 /* 'optlen' is the size of the addresses buffer. */
4622 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4623 break;
4624
4625 case SCTP_DISABLE_FRAGMENTS:
4626 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4627 break;
4628
4629 case SCTP_EVENTS:
4630 retval = sctp_setsockopt_events(sk, kopt, optlen);
4631 break;
4632
4633 case SCTP_AUTOCLOSE:
4634 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4635 break;
4636
4637 case SCTP_PEER_ADDR_PARAMS:
4638 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4639 break;
4640
4641 case SCTP_DELAYED_SACK:
4642 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4643 break;
4644 case SCTP_PARTIAL_DELIVERY_POINT:
4645 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4646 break;
4647
4648 case SCTP_INITMSG:
4649 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4650 break;
4651 case SCTP_DEFAULT_SEND_PARAM:
4652 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4653 break;
4654 case SCTP_DEFAULT_SNDINFO:
4655 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4656 break;
4657 case SCTP_PRIMARY_ADDR:
4658 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4659 break;
4660 case SCTP_SET_PEER_PRIMARY_ADDR:
4661 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4662 break;
4663 case SCTP_NODELAY:
4664 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4665 break;
4666 case SCTP_RTOINFO:
4667 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4668 break;
4669 case SCTP_ASSOCINFO:
4670 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4671 break;
4672 case SCTP_I_WANT_MAPPED_V4_ADDR:
4673 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4674 break;
4675 case SCTP_MAXSEG:
4676 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4677 break;
4678 case SCTP_ADAPTATION_LAYER:
4679 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4680 break;
4681 case SCTP_CONTEXT:
4682 retval = sctp_setsockopt_context(sk, kopt, optlen);
4683 break;
4684 case SCTP_FRAGMENT_INTERLEAVE:
4685 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4686 break;
4687 case SCTP_MAX_BURST:
4688 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4689 break;
4690 case SCTP_AUTH_CHUNK:
4691 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4692 break;
4693 case SCTP_HMAC_IDENT:
4694 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4695 break;
4696 case SCTP_AUTH_KEY:
4697 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4698 break;
4699 case SCTP_AUTH_ACTIVE_KEY:
4700 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4701 break;
4702 case SCTP_AUTH_DELETE_KEY:
4703 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4704 break;
4705 case SCTP_AUTH_DEACTIVATE_KEY:
4706 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4707 break;
4708 case SCTP_AUTO_ASCONF:
4709 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4710 break;
4711 case SCTP_PEER_ADDR_THLDS:
4712 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4713 false);
4714 break;
4715 case SCTP_PEER_ADDR_THLDS_V2:
4716 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4717 true);
4718 break;
4719 case SCTP_RECVRCVINFO:
4720 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4721 break;
4722 case SCTP_RECVNXTINFO:
4723 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4724 break;
4725 case SCTP_PR_SUPPORTED:
4726 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4727 break;
4728 case SCTP_DEFAULT_PRINFO:
4729 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4730 break;
4731 case SCTP_RECONFIG_SUPPORTED:
4732 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4733 break;
4734 case SCTP_ENABLE_STREAM_RESET:
4735 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4736 break;
4737 case SCTP_RESET_STREAMS:
4738 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4739 break;
4740 case SCTP_RESET_ASSOC:
4741 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4742 break;
4743 case SCTP_ADD_STREAMS:
4744 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4745 break;
4746 case SCTP_STREAM_SCHEDULER:
4747 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4748 break;
4749 case SCTP_STREAM_SCHEDULER_VALUE:
4750 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4751 break;
4752 case SCTP_INTERLEAVING_SUPPORTED:
4753 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4754 optlen);
4755 break;
4756 case SCTP_REUSE_PORT:
4757 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4758 break;
4759 case SCTP_EVENT:
4760 retval = sctp_setsockopt_event(sk, kopt, optlen);
4761 break;
4762 case SCTP_ASCONF_SUPPORTED:
4763 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4764 break;
4765 case SCTP_AUTH_SUPPORTED:
4766 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4767 break;
4768 case SCTP_ECN_SUPPORTED:
4769 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4770 break;
4771 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4772 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4773 break;
4774 case SCTP_REMOTE_UDP_ENCAPS_PORT:
4775 retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4776 break;
4777 case SCTP_PLPMTUD_PROBE_INTERVAL:
4778 retval = sctp_setsockopt_probe_interval(sk, kopt, optlen);
4779 break;
4780 default:
4781 retval = -ENOPROTOOPT;
4782 break;
4783 }
4784
4785 release_sock(sk);
4786 kfree(kopt);
4787 return retval;
4788}
4789
4790/* API 3.1.6 connect() - UDP Style Syntax
4791 *
4792 * An application may use the connect() call in the UDP model to initiate an
4793 * association without sending data.
4794 *
4795 * The syntax is:
4796 *
4797 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4798 *
4799 * sd: the socket descriptor to have a new association added to.
4800 *
4801 * nam: the address structure (either struct sockaddr_in or struct
4802 * sockaddr_in6 defined in RFC2553 [7]).
4803 *
4804 * len: the size of the address.
4805 */
4806static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4807 int addr_len, int flags)
4808{
4809 struct sctp_af *af;
4810 int err = -EINVAL;
4811
4812 lock_sock(sk);
4813 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4814 addr, addr_len);
4815
4816 /* Validate addr_len before calling common connect/connectx routine. */
4817 af = sctp_get_af_specific(addr->sa_family);
4818 if (af && addr_len >= af->sockaddr_len)
4819 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4820
4821 release_sock(sk);
4822 return err;
4823}
4824
4825int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4826 int addr_len, int flags)
4827{
4828 if (addr_len < sizeof(uaddr->sa_family))
4829 return -EINVAL;
4830
4831 if (uaddr->sa_family == AF_UNSPEC)
4832 return -EOPNOTSUPP;
4833
4834 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4835}
4836
4837/* Only called when shutdown a listening SCTP socket. */
4838static int sctp_disconnect(struct sock *sk, int flags)
4839{
4840 if (!sctp_style(sk, TCP))
4841 return -EOPNOTSUPP;
4842
4843 sk->sk_shutdown |= RCV_SHUTDOWN;
4844 return 0;
4845}
4846
4847/* 4.1.4 accept() - TCP Style Syntax
4848 *
4849 * Applications use accept() call to remove an established SCTP
4850 * association from the accept queue of the endpoint. A new socket
4851 * descriptor will be returned from accept() to represent the newly
4852 * formed association.
4853 */
4854static struct sock *sctp_accept(struct sock *sk, struct proto_accept_arg *arg)
4855{
4856 struct sctp_sock *sp;
4857 struct sctp_endpoint *ep;
4858 struct sock *newsk = NULL;
4859 struct sctp_association *asoc;
4860 long timeo;
4861 int error = 0;
4862
4863 lock_sock(sk);
4864
4865 sp = sctp_sk(sk);
4866 ep = sp->ep;
4867
4868 if (!sctp_style(sk, TCP)) {
4869 error = -EOPNOTSUPP;
4870 goto out;
4871 }
4872
4873 if (!sctp_sstate(sk, LISTENING) ||
4874 (sk->sk_shutdown & RCV_SHUTDOWN)) {
4875 error = -EINVAL;
4876 goto out;
4877 }
4878
4879 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
4880
4881 error = sctp_wait_for_accept(sk, timeo);
4882 if (error)
4883 goto out;
4884
4885 /* We treat the list of associations on the endpoint as the accept
4886 * queue and pick the first association on the list.
4887 */
4888 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4889
4890 newsk = sp->pf->create_accept_sk(sk, asoc, arg->kern);
4891 if (!newsk) {
4892 error = -ENOMEM;
4893 goto out;
4894 }
4895
4896 /* Populate the fields of the newsk from the oldsk and migrate the
4897 * asoc to the newsk.
4898 */
4899 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4900 if (error) {
4901 sk_common_release(newsk);
4902 newsk = NULL;
4903 }
4904
4905out:
4906 release_sock(sk);
4907 arg->err = error;
4908 return newsk;
4909}
4910
4911/* The SCTP ioctl handler. */
4912static int sctp_ioctl(struct sock *sk, int cmd, int *karg)
4913{
4914 int rc = -ENOTCONN;
4915
4916 lock_sock(sk);
4917
4918 /*
4919 * SEQPACKET-style sockets in LISTENING state are valid, for
4920 * SCTP, so only discard TCP-style sockets in LISTENING state.
4921 */
4922 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4923 goto out;
4924
4925 switch (cmd) {
4926 case SIOCINQ: {
4927 struct sk_buff *skb;
4928 *karg = 0;
4929
4930 skb = skb_peek(&sk->sk_receive_queue);
4931 if (skb != NULL) {
4932 /*
4933 * We will only return the amount of this packet since
4934 * that is all that will be read.
4935 */
4936 *karg = skb->len;
4937 }
4938 rc = 0;
4939 break;
4940 }
4941 default:
4942 rc = -ENOIOCTLCMD;
4943 break;
4944 }
4945out:
4946 release_sock(sk);
4947 return rc;
4948}
4949
4950/* This is the function which gets called during socket creation to
4951 * initialized the SCTP-specific portion of the sock.
4952 * The sock structure should already be zero-filled memory.
4953 */
4954static int sctp_init_sock(struct sock *sk)
4955{
4956 struct net *net = sock_net(sk);
4957 struct sctp_sock *sp;
4958
4959 pr_debug("%s: sk:%p\n", __func__, sk);
4960
4961 sp = sctp_sk(sk);
4962
4963 /* Initialize the SCTP per socket area. */
4964 switch (sk->sk_type) {
4965 case SOCK_SEQPACKET:
4966 sp->type = SCTP_SOCKET_UDP;
4967 break;
4968 case SOCK_STREAM:
4969 sp->type = SCTP_SOCKET_TCP;
4970 break;
4971 default:
4972 return -ESOCKTNOSUPPORT;
4973 }
4974
4975 sk->sk_gso_type = SKB_GSO_SCTP;
4976
4977 /* Initialize default send parameters. These parameters can be
4978 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4979 */
4980 sp->default_stream = 0;
4981 sp->default_ppid = 0;
4982 sp->default_flags = 0;
4983 sp->default_context = 0;
4984 sp->default_timetolive = 0;
4985
4986 sp->default_rcv_context = 0;
4987 sp->max_burst = net->sctp.max_burst;
4988
4989 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4990
4991 /* Initialize default setup parameters. These parameters
4992 * can be modified with the SCTP_INITMSG socket option or
4993 * overridden by the SCTP_INIT CMSG.
4994 */
4995 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4996 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4997 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4998 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4999
5000 /* Initialize default RTO related parameters. These parameters can
5001 * be modified for with the SCTP_RTOINFO socket option.
5002 */
5003 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5004 sp->rtoinfo.srto_max = net->sctp.rto_max;
5005 sp->rtoinfo.srto_min = net->sctp.rto_min;
5006
5007 /* Initialize default association related parameters. These parameters
5008 * can be modified with the SCTP_ASSOCINFO socket option.
5009 */
5010 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5011 sp->assocparams.sasoc_number_peer_destinations = 0;
5012 sp->assocparams.sasoc_peer_rwnd = 0;
5013 sp->assocparams.sasoc_local_rwnd = 0;
5014 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5015
5016 /* Initialize default event subscriptions. By default, all the
5017 * options are off.
5018 */
5019 sp->subscribe = 0;
5020
5021 /* Default Peer Address Parameters. These defaults can
5022 * be modified via SCTP_PEER_ADDR_PARAMS
5023 */
5024 sp->hbinterval = net->sctp.hb_interval;
5025 sp->udp_port = htons(net->sctp.udp_port);
5026 sp->encap_port = htons(net->sctp.encap_port);
5027 sp->pathmaxrxt = net->sctp.max_retrans_path;
5028 sp->pf_retrans = net->sctp.pf_retrans;
5029 sp->ps_retrans = net->sctp.ps_retrans;
5030 sp->pf_expose = net->sctp.pf_expose;
5031 sp->pathmtu = 0; /* allow default discovery */
5032 sp->sackdelay = net->sctp.sack_timeout;
5033 sp->sackfreq = 2;
5034 sp->param_flags = SPP_HB_ENABLE |
5035 SPP_PMTUD_ENABLE |
5036 SPP_SACKDELAY_ENABLE;
5037 sp->default_ss = SCTP_SS_DEFAULT;
5038
5039 /* If enabled no SCTP message fragmentation will be performed.
5040 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5041 */
5042 sp->disable_fragments = 0;
5043
5044 /* Enable Nagle algorithm by default. */
5045 sp->nodelay = 0;
5046
5047 sp->recvrcvinfo = 0;
5048 sp->recvnxtinfo = 0;
5049
5050 /* Enable by default. */
5051 sp->v4mapped = 1;
5052
5053 /* Auto-close idle associations after the configured
5054 * number of seconds. A value of 0 disables this
5055 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5056 * for UDP-style sockets only.
5057 */
5058 sp->autoclose = 0;
5059
5060 /* User specified fragmentation limit. */
5061 sp->user_frag = 0;
5062
5063 sp->adaptation_ind = 0;
5064
5065 sp->pf = sctp_get_pf_specific(sk->sk_family);
5066
5067 /* Control variables for partial data delivery. */
5068 atomic_set(&sp->pd_mode, 0);
5069 skb_queue_head_init(&sp->pd_lobby);
5070 sp->frag_interleave = 0;
5071 sp->probe_interval = net->sctp.probe_interval;
5072
5073 /* Create a per socket endpoint structure. Even if we
5074 * change the data structure relationships, this may still
5075 * be useful for storing pre-connect address information.
5076 */
5077 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5078 if (!sp->ep)
5079 return -ENOMEM;
5080
5081 sp->hmac = NULL;
5082
5083 sk->sk_destruct = sctp_destruct_sock;
5084
5085 SCTP_DBG_OBJCNT_INC(sock);
5086
5087 sk_sockets_allocated_inc(sk);
5088 sock_prot_inuse_add(net, sk->sk_prot, 1);
5089
5090 return 0;
5091}
5092
5093/* Cleanup any SCTP per socket resources. Must be called with
5094 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5095 */
5096static void sctp_destroy_sock(struct sock *sk)
5097{
5098 struct sctp_sock *sp;
5099
5100 pr_debug("%s: sk:%p\n", __func__, sk);
5101
5102 /* Release our hold on the endpoint. */
5103 sp = sctp_sk(sk);
5104 /* This could happen during socket init, thus we bail out
5105 * early, since the rest of the below is not setup either.
5106 */
5107 if (sp->ep == NULL)
5108 return;
5109
5110 if (sp->do_auto_asconf) {
5111 sp->do_auto_asconf = 0;
5112 list_del(&sp->auto_asconf_list);
5113 }
5114 sctp_endpoint_free(sp->ep);
5115 sk_sockets_allocated_dec(sk);
5116 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5117}
5118
5119/* Triggered when there are no references on the socket anymore */
5120static void sctp_destruct_common(struct sock *sk)
5121{
5122 struct sctp_sock *sp = sctp_sk(sk);
5123
5124 /* Free up the HMAC transform. */
5125 crypto_free_shash(sp->hmac);
5126}
5127
5128static void sctp_destruct_sock(struct sock *sk)
5129{
5130 sctp_destruct_common(sk);
5131 inet_sock_destruct(sk);
5132}
5133
5134/* API 4.1.7 shutdown() - TCP Style Syntax
5135 * int shutdown(int socket, int how);
5136 *
5137 * sd - the socket descriptor of the association to be closed.
5138 * how - Specifies the type of shutdown. The values are
5139 * as follows:
5140 * SHUT_RD
5141 * Disables further receive operations. No SCTP
5142 * protocol action is taken.
5143 * SHUT_WR
5144 * Disables further send operations, and initiates
5145 * the SCTP shutdown sequence.
5146 * SHUT_RDWR
5147 * Disables further send and receive operations
5148 * and initiates the SCTP shutdown sequence.
5149 */
5150static void sctp_shutdown(struct sock *sk, int how)
5151{
5152 struct net *net = sock_net(sk);
5153 struct sctp_endpoint *ep;
5154
5155 if (!sctp_style(sk, TCP))
5156 return;
5157
5158 ep = sctp_sk(sk)->ep;
5159 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5160 struct sctp_association *asoc;
5161
5162 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5163 asoc = list_entry(ep->asocs.next,
5164 struct sctp_association, asocs);
5165 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5166 }
5167}
5168
5169int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5170 struct sctp_info *info)
5171{
5172 struct sctp_transport *prim;
5173 struct list_head *pos;
5174 int mask;
5175
5176 memset(info, 0, sizeof(*info));
5177 if (!asoc) {
5178 struct sctp_sock *sp = sctp_sk(sk);
5179
5180 info->sctpi_s_autoclose = sp->autoclose;
5181 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5182 info->sctpi_s_pd_point = sp->pd_point;
5183 info->sctpi_s_nodelay = sp->nodelay;
5184 info->sctpi_s_disable_fragments = sp->disable_fragments;
5185 info->sctpi_s_v4mapped = sp->v4mapped;
5186 info->sctpi_s_frag_interleave = sp->frag_interleave;
5187 info->sctpi_s_type = sp->type;
5188
5189 return 0;
5190 }
5191
5192 info->sctpi_tag = asoc->c.my_vtag;
5193 info->sctpi_state = asoc->state;
5194 info->sctpi_rwnd = asoc->a_rwnd;
5195 info->sctpi_unackdata = asoc->unack_data;
5196 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5197 info->sctpi_instrms = asoc->stream.incnt;
5198 info->sctpi_outstrms = asoc->stream.outcnt;
5199 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5200 info->sctpi_inqueue++;
5201 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5202 info->sctpi_outqueue++;
5203 info->sctpi_overall_error = asoc->overall_error_count;
5204 info->sctpi_max_burst = asoc->max_burst;
5205 info->sctpi_maxseg = asoc->frag_point;
5206 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5207 info->sctpi_peer_tag = asoc->c.peer_vtag;
5208
5209 mask = asoc->peer.intl_capable << 1;
5210 mask = (mask | asoc->peer.ecn_capable) << 1;
5211 mask = (mask | asoc->peer.ipv4_address) << 1;
5212 mask = (mask | asoc->peer.ipv6_address) << 1;
5213 mask = (mask | asoc->peer.reconf_capable) << 1;
5214 mask = (mask | asoc->peer.asconf_capable) << 1;
5215 mask = (mask | asoc->peer.prsctp_capable) << 1;
5216 mask = (mask | asoc->peer.auth_capable);
5217 info->sctpi_peer_capable = mask;
5218 mask = asoc->peer.sack_needed << 1;
5219 mask = (mask | asoc->peer.sack_generation) << 1;
5220 mask = (mask | asoc->peer.zero_window_announced);
5221 info->sctpi_peer_sack = mask;
5222
5223 info->sctpi_isacks = asoc->stats.isacks;
5224 info->sctpi_osacks = asoc->stats.osacks;
5225 info->sctpi_opackets = asoc->stats.opackets;
5226 info->sctpi_ipackets = asoc->stats.ipackets;
5227 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5228 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5229 info->sctpi_idupchunks = asoc->stats.idupchunks;
5230 info->sctpi_gapcnt = asoc->stats.gapcnt;
5231 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5232 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5233 info->sctpi_oodchunks = asoc->stats.oodchunks;
5234 info->sctpi_iodchunks = asoc->stats.iodchunks;
5235 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5236 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5237
5238 prim = asoc->peer.primary_path;
5239 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5240 info->sctpi_p_state = prim->state;
5241 info->sctpi_p_cwnd = prim->cwnd;
5242 info->sctpi_p_srtt = prim->srtt;
5243 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5244 info->sctpi_p_hbinterval = prim->hbinterval;
5245 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5246 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5247 info->sctpi_p_ssthresh = prim->ssthresh;
5248 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5249 info->sctpi_p_flight_size = prim->flight_size;
5250 info->sctpi_p_error = prim->error_count;
5251
5252 return 0;
5253}
5254EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5255
5256/* use callback to avoid exporting the core structure */
5257void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5258{
5259 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5260
5261 rhashtable_walk_start(iter);
5262}
5263
5264void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5265{
5266 rhashtable_walk_stop(iter);
5267 rhashtable_walk_exit(iter);
5268}
5269
5270struct sctp_transport *sctp_transport_get_next(struct net *net,
5271 struct rhashtable_iter *iter)
5272{
5273 struct sctp_transport *t;
5274
5275 t = rhashtable_walk_next(iter);
5276 for (; t; t = rhashtable_walk_next(iter)) {
5277 if (IS_ERR(t)) {
5278 if (PTR_ERR(t) == -EAGAIN)
5279 continue;
5280 break;
5281 }
5282
5283 if (!sctp_transport_hold(t))
5284 continue;
5285
5286 if (net_eq(t->asoc->base.net, net) &&
5287 t->asoc->peer.primary_path == t)
5288 break;
5289
5290 sctp_transport_put(t);
5291 }
5292
5293 return t;
5294}
5295
5296struct sctp_transport *sctp_transport_get_idx(struct net *net,
5297 struct rhashtable_iter *iter,
5298 int pos)
5299{
5300 struct sctp_transport *t;
5301
5302 if (!pos)
5303 return SEQ_START_TOKEN;
5304
5305 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5306 if (!--pos)
5307 break;
5308 sctp_transport_put(t);
5309 }
5310
5311 return t;
5312}
5313
5314int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5315 void *p) {
5316 int err = 0;
5317 int hash = 0;
5318 struct sctp_endpoint *ep;
5319 struct sctp_hashbucket *head;
5320
5321 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5322 hash++, head++) {
5323 read_lock_bh(&head->lock);
5324 sctp_for_each_hentry(ep, &head->chain) {
5325 err = cb(ep, p);
5326 if (err)
5327 break;
5328 }
5329 read_unlock_bh(&head->lock);
5330 }
5331
5332 return err;
5333}
5334EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5335
5336int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5337 const union sctp_addr *laddr,
5338 const union sctp_addr *paddr, void *p, int dif)
5339{
5340 struct sctp_transport *transport;
5341 struct sctp_endpoint *ep;
5342 int err = -ENOENT;
5343
5344 rcu_read_lock();
5345 transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, dif);
5346 if (!transport) {
5347 rcu_read_unlock();
5348 return err;
5349 }
5350 ep = transport->asoc->ep;
5351 if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5352 sctp_transport_put(transport);
5353 rcu_read_unlock();
5354 return err;
5355 }
5356 rcu_read_unlock();
5357
5358 err = cb(ep, transport, p);
5359 sctp_endpoint_put(ep);
5360 sctp_transport_put(transport);
5361 return err;
5362}
5363EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5364
5365int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5366 struct net *net, int *pos, void *p)
5367{
5368 struct rhashtable_iter hti;
5369 struct sctp_transport *tsp;
5370 struct sctp_endpoint *ep;
5371 int ret;
5372
5373again:
5374 ret = 0;
5375 sctp_transport_walk_start(&hti);
5376
5377 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5378 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5379 ep = tsp->asoc->ep;
5380 if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5381 ret = cb(ep, tsp, p);
5382 if (ret)
5383 break;
5384 sctp_endpoint_put(ep);
5385 }
5386 (*pos)++;
5387 sctp_transport_put(tsp);
5388 }
5389 sctp_transport_walk_stop(&hti);
5390
5391 if (ret) {
5392 if (cb_done && !cb_done(ep, tsp, p)) {
5393 (*pos)++;
5394 sctp_endpoint_put(ep);
5395 sctp_transport_put(tsp);
5396 goto again;
5397 }
5398 sctp_endpoint_put(ep);
5399 sctp_transport_put(tsp);
5400 }
5401
5402 return ret;
5403}
5404EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5405
5406/* 7.2.1 Association Status (SCTP_STATUS)
5407
5408 * Applications can retrieve current status information about an
5409 * association, including association state, peer receiver window size,
5410 * number of unacked data chunks, and number of data chunks pending
5411 * receipt. This information is read-only.
5412 */
5413static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5414 char __user *optval,
5415 int __user *optlen)
5416{
5417 struct sctp_status status;
5418 struct sctp_association *asoc = NULL;
5419 struct sctp_transport *transport;
5420 sctp_assoc_t associd;
5421 int retval = 0;
5422
5423 if (len < sizeof(status)) {
5424 retval = -EINVAL;
5425 goto out;
5426 }
5427
5428 len = sizeof(status);
5429 if (copy_from_user(&status, optval, len)) {
5430 retval = -EFAULT;
5431 goto out;
5432 }
5433
5434 associd = status.sstat_assoc_id;
5435 asoc = sctp_id2assoc(sk, associd);
5436 if (!asoc) {
5437 retval = -EINVAL;
5438 goto out;
5439 }
5440
5441 transport = asoc->peer.primary_path;
5442
5443 status.sstat_assoc_id = sctp_assoc2id(asoc);
5444 status.sstat_state = sctp_assoc_to_state(asoc);
5445 status.sstat_rwnd = asoc->peer.rwnd;
5446 status.sstat_unackdata = asoc->unack_data;
5447
5448 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5449 status.sstat_instrms = asoc->stream.incnt;
5450 status.sstat_outstrms = asoc->stream.outcnt;
5451 status.sstat_fragmentation_point = asoc->frag_point;
5452 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5453 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5454 transport->af_specific->sockaddr_len);
5455 /* Map ipv4 address into v4-mapped-on-v6 address. */
5456 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5457 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5458 status.sstat_primary.spinfo_state = transport->state;
5459 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5460 status.sstat_primary.spinfo_srtt = transport->srtt;
5461 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5462 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5463
5464 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5465 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5466
5467 if (put_user(len, optlen)) {
5468 retval = -EFAULT;
5469 goto out;
5470 }
5471
5472 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5473 __func__, len, status.sstat_state, status.sstat_rwnd,
5474 status.sstat_assoc_id);
5475
5476 if (copy_to_user(optval, &status, len)) {
5477 retval = -EFAULT;
5478 goto out;
5479 }
5480
5481out:
5482 return retval;
5483}
5484
5485
5486/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5487 *
5488 * Applications can retrieve information about a specific peer address
5489 * of an association, including its reachability state, congestion
5490 * window, and retransmission timer values. This information is
5491 * read-only.
5492 */
5493static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5494 char __user *optval,
5495 int __user *optlen)
5496{
5497 struct sctp_paddrinfo pinfo;
5498 struct sctp_transport *transport;
5499 int retval = 0;
5500
5501 if (len < sizeof(pinfo)) {
5502 retval = -EINVAL;
5503 goto out;
5504 }
5505
5506 len = sizeof(pinfo);
5507 if (copy_from_user(&pinfo, optval, len)) {
5508 retval = -EFAULT;
5509 goto out;
5510 }
5511
5512 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5513 pinfo.spinfo_assoc_id);
5514 if (!transport) {
5515 retval = -EINVAL;
5516 goto out;
5517 }
5518
5519 if (transport->state == SCTP_PF &&
5520 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5521 retval = -EACCES;
5522 goto out;
5523 }
5524
5525 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5526 pinfo.spinfo_state = transport->state;
5527 pinfo.spinfo_cwnd = transport->cwnd;
5528 pinfo.spinfo_srtt = transport->srtt;
5529 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5530 pinfo.spinfo_mtu = transport->pathmtu;
5531
5532 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5533 pinfo.spinfo_state = SCTP_ACTIVE;
5534
5535 if (put_user(len, optlen)) {
5536 retval = -EFAULT;
5537 goto out;
5538 }
5539
5540 if (copy_to_user(optval, &pinfo, len)) {
5541 retval = -EFAULT;
5542 goto out;
5543 }
5544
5545out:
5546 return retval;
5547}
5548
5549/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5550 *
5551 * This option is a on/off flag. If enabled no SCTP message
5552 * fragmentation will be performed. Instead if a message being sent
5553 * exceeds the current PMTU size, the message will NOT be sent and
5554 * instead a error will be indicated to the user.
5555 */
5556static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5557 char __user *optval, int __user *optlen)
5558{
5559 int val;
5560
5561 if (len < sizeof(int))
5562 return -EINVAL;
5563
5564 len = sizeof(int);
5565 val = (sctp_sk(sk)->disable_fragments == 1);
5566 if (put_user(len, optlen))
5567 return -EFAULT;
5568 if (copy_to_user(optval, &val, len))
5569 return -EFAULT;
5570 return 0;
5571}
5572
5573/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5574 *
5575 * This socket option is used to specify various notifications and
5576 * ancillary data the user wishes to receive.
5577 */
5578static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5579 int __user *optlen)
5580{
5581 struct sctp_event_subscribe subscribe;
5582 __u8 *sn_type = (__u8 *)&subscribe;
5583 int i;
5584
5585 if (len == 0)
5586 return -EINVAL;
5587 if (len > sizeof(struct sctp_event_subscribe))
5588 len = sizeof(struct sctp_event_subscribe);
5589 if (put_user(len, optlen))
5590 return -EFAULT;
5591
5592 for (i = 0; i < len; i++)
5593 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5594 SCTP_SN_TYPE_BASE + i);
5595
5596 if (copy_to_user(optval, &subscribe, len))
5597 return -EFAULT;
5598
5599 return 0;
5600}
5601
5602/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5603 *
5604 * This socket option is applicable to the UDP-style socket only. When
5605 * set it will cause associations that are idle for more than the
5606 * specified number of seconds to automatically close. An association
5607 * being idle is defined an association that has NOT sent or received
5608 * user data. The special value of '0' indicates that no automatic
5609 * close of any associations should be performed. The option expects an
5610 * integer defining the number of seconds of idle time before an
5611 * association is closed.
5612 */
5613static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5614{
5615 /* Applicable to UDP-style socket only */
5616 if (sctp_style(sk, TCP))
5617 return -EOPNOTSUPP;
5618 if (len < sizeof(int))
5619 return -EINVAL;
5620 len = sizeof(int);
5621 if (put_user(len, optlen))
5622 return -EFAULT;
5623 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5624 return -EFAULT;
5625 return 0;
5626}
5627
5628/* Helper routine to branch off an association to a new socket. */
5629int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5630{
5631 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5632 struct sctp_sock *sp = sctp_sk(sk);
5633 struct socket *sock;
5634 int err = 0;
5635
5636 /* Do not peel off from one netns to another one. */
5637 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5638 return -EINVAL;
5639
5640 if (!asoc)
5641 return -EINVAL;
5642
5643 /* An association cannot be branched off from an already peeled-off
5644 * socket, nor is this supported for tcp style sockets.
5645 */
5646 if (!sctp_style(sk, UDP))
5647 return -EINVAL;
5648
5649 /* Create a new socket. */
5650 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5651 if (err < 0)
5652 return err;
5653
5654 sctp_copy_sock(sock->sk, sk, asoc);
5655
5656 /* Make peeled-off sockets more like 1-1 accepted sockets.
5657 * Set the daddr and initialize id to something more random and also
5658 * copy over any ip options.
5659 */
5660 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5661 sp->pf->copy_ip_options(sk, sock->sk);
5662
5663 /* Populate the fields of the newsk from the oldsk and migrate the
5664 * asoc to the newsk.
5665 */
5666 err = sctp_sock_migrate(sk, sock->sk, asoc,
5667 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5668 if (err) {
5669 sock_release(sock);
5670 sock = NULL;
5671 }
5672
5673 *sockp = sock;
5674
5675 return err;
5676}
5677EXPORT_SYMBOL(sctp_do_peeloff);
5678
5679static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5680 struct file **newfile, unsigned flags)
5681{
5682 struct socket *newsock;
5683 int retval;
5684
5685 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5686 if (retval < 0)
5687 goto out;
5688
5689 /* Map the socket to an unused fd that can be returned to the user. */
5690 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5691 if (retval < 0) {
5692 sock_release(newsock);
5693 goto out;
5694 }
5695
5696 *newfile = sock_alloc_file(newsock, 0, NULL);
5697 if (IS_ERR(*newfile)) {
5698 put_unused_fd(retval);
5699 retval = PTR_ERR(*newfile);
5700 *newfile = NULL;
5701 return retval;
5702 }
5703
5704 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5705 retval);
5706
5707 peeloff->sd = retval;
5708
5709 if (flags & SOCK_NONBLOCK)
5710 (*newfile)->f_flags |= O_NONBLOCK;
5711out:
5712 return retval;
5713}
5714
5715static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5716{
5717 sctp_peeloff_arg_t peeloff;
5718 struct file *newfile = NULL;
5719 int retval = 0;
5720
5721 if (len < sizeof(sctp_peeloff_arg_t))
5722 return -EINVAL;
5723 len = sizeof(sctp_peeloff_arg_t);
5724 if (copy_from_user(&peeloff, optval, len))
5725 return -EFAULT;
5726
5727 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5728 if (retval < 0)
5729 goto out;
5730
5731 /* Return the fd mapped to the new socket. */
5732 if (put_user(len, optlen)) {
5733 fput(newfile);
5734 put_unused_fd(retval);
5735 return -EFAULT;
5736 }
5737
5738 if (copy_to_user(optval, &peeloff, len)) {
5739 fput(newfile);
5740 put_unused_fd(retval);
5741 return -EFAULT;
5742 }
5743 fd_install(retval, newfile);
5744out:
5745 return retval;
5746}
5747
5748static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5749 char __user *optval, int __user *optlen)
5750{
5751 sctp_peeloff_flags_arg_t peeloff;
5752 struct file *newfile = NULL;
5753 int retval = 0;
5754
5755 if (len < sizeof(sctp_peeloff_flags_arg_t))
5756 return -EINVAL;
5757 len = sizeof(sctp_peeloff_flags_arg_t);
5758 if (copy_from_user(&peeloff, optval, len))
5759 return -EFAULT;
5760
5761 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5762 &newfile, peeloff.flags);
5763 if (retval < 0)
5764 goto out;
5765
5766 /* Return the fd mapped to the new socket. */
5767 if (put_user(len, optlen)) {
5768 fput(newfile);
5769 put_unused_fd(retval);
5770 return -EFAULT;
5771 }
5772
5773 if (copy_to_user(optval, &peeloff, len)) {
5774 fput(newfile);
5775 put_unused_fd(retval);
5776 return -EFAULT;
5777 }
5778 fd_install(retval, newfile);
5779out:
5780 return retval;
5781}
5782
5783/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5784 *
5785 * Applications can enable or disable heartbeats for any peer address of
5786 * an association, modify an address's heartbeat interval, force a
5787 * heartbeat to be sent immediately, and adjust the address's maximum
5788 * number of retransmissions sent before an address is considered
5789 * unreachable. The following structure is used to access and modify an
5790 * address's parameters:
5791 *
5792 * struct sctp_paddrparams {
5793 * sctp_assoc_t spp_assoc_id;
5794 * struct sockaddr_storage spp_address;
5795 * uint32_t spp_hbinterval;
5796 * uint16_t spp_pathmaxrxt;
5797 * uint32_t spp_pathmtu;
5798 * uint32_t spp_sackdelay;
5799 * uint32_t spp_flags;
5800 * };
5801 *
5802 * spp_assoc_id - (one-to-many style socket) This is filled in the
5803 * application, and identifies the association for
5804 * this query.
5805 * spp_address - This specifies which address is of interest.
5806 * spp_hbinterval - This contains the value of the heartbeat interval,
5807 * in milliseconds. If a value of zero
5808 * is present in this field then no changes are to
5809 * be made to this parameter.
5810 * spp_pathmaxrxt - This contains the maximum number of
5811 * retransmissions before this address shall be
5812 * considered unreachable. If a value of zero
5813 * is present in this field then no changes are to
5814 * be made to this parameter.
5815 * spp_pathmtu - When Path MTU discovery is disabled the value
5816 * specified here will be the "fixed" path mtu.
5817 * Note that if the spp_address field is empty
5818 * then all associations on this address will
5819 * have this fixed path mtu set upon them.
5820 *
5821 * spp_sackdelay - When delayed sack is enabled, this value specifies
5822 * the number of milliseconds that sacks will be delayed
5823 * for. This value will apply to all addresses of an
5824 * association if the spp_address field is empty. Note
5825 * also, that if delayed sack is enabled and this
5826 * value is set to 0, no change is made to the last
5827 * recorded delayed sack timer value.
5828 *
5829 * spp_flags - These flags are used to control various features
5830 * on an association. The flag field may contain
5831 * zero or more of the following options.
5832 *
5833 * SPP_HB_ENABLE - Enable heartbeats on the
5834 * specified address. Note that if the address
5835 * field is empty all addresses for the association
5836 * have heartbeats enabled upon them.
5837 *
5838 * SPP_HB_DISABLE - Disable heartbeats on the
5839 * speicifed address. Note that if the address
5840 * field is empty all addresses for the association
5841 * will have their heartbeats disabled. Note also
5842 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5843 * mutually exclusive, only one of these two should
5844 * be specified. Enabling both fields will have
5845 * undetermined results.
5846 *
5847 * SPP_HB_DEMAND - Request a user initiated heartbeat
5848 * to be made immediately.
5849 *
5850 * SPP_PMTUD_ENABLE - This field will enable PMTU
5851 * discovery upon the specified address. Note that
5852 * if the address feild is empty then all addresses
5853 * on the association are effected.
5854 *
5855 * SPP_PMTUD_DISABLE - This field will disable PMTU
5856 * discovery upon the specified address. Note that
5857 * if the address feild is empty then all addresses
5858 * on the association are effected. Not also that
5859 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5860 * exclusive. Enabling both will have undetermined
5861 * results.
5862 *
5863 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5864 * on delayed sack. The time specified in spp_sackdelay
5865 * is used to specify the sack delay for this address. Note
5866 * that if spp_address is empty then all addresses will
5867 * enable delayed sack and take on the sack delay
5868 * value specified in spp_sackdelay.
5869 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5870 * off delayed sack. If the spp_address field is blank then
5871 * delayed sack is disabled for the entire association. Note
5872 * also that this field is mutually exclusive to
5873 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5874 * results.
5875 *
5876 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5877 * setting of the IPV6 flow label value. The value is
5878 * contained in the spp_ipv6_flowlabel field.
5879 * Upon retrieval, this flag will be set to indicate that
5880 * the spp_ipv6_flowlabel field has a valid value returned.
5881 * If a specific destination address is set (in the
5882 * spp_address field), then the value returned is that of
5883 * the address. If just an association is specified (and
5884 * no address), then the association's default flow label
5885 * is returned. If neither an association nor a destination
5886 * is specified, then the socket's default flow label is
5887 * returned. For non-IPv6 sockets, this flag will be left
5888 * cleared.
5889 *
5890 * SPP_DSCP: Setting this flag enables the setting of the
5891 * Differentiated Services Code Point (DSCP) value
5892 * associated with either the association or a specific
5893 * address. The value is obtained in the spp_dscp field.
5894 * Upon retrieval, this flag will be set to indicate that
5895 * the spp_dscp field has a valid value returned. If a
5896 * specific destination address is set when called (in the
5897 * spp_address field), then that specific destination
5898 * address's DSCP value is returned. If just an association
5899 * is specified, then the association's default DSCP is
5900 * returned. If neither an association nor a destination is
5901 * specified, then the socket's default DSCP is returned.
5902 *
5903 * spp_ipv6_flowlabel
5904 * - This field is used in conjunction with the
5905 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5906 * The 20 least significant bits are used for the flow
5907 * label. This setting has precedence over any IPv6-layer
5908 * setting.
5909 *
5910 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5911 * and contains the DSCP. The 6 most significant bits are
5912 * used for the DSCP. This setting has precedence over any
5913 * IPv4- or IPv6- layer setting.
5914 */
5915static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5916 char __user *optval, int __user *optlen)
5917{
5918 struct sctp_paddrparams params;
5919 struct sctp_transport *trans = NULL;
5920 struct sctp_association *asoc = NULL;
5921 struct sctp_sock *sp = sctp_sk(sk);
5922
5923 if (len >= sizeof(params))
5924 len = sizeof(params);
5925 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5926 spp_ipv6_flowlabel), 4))
5927 len = ALIGN(offsetof(struct sctp_paddrparams,
5928 spp_ipv6_flowlabel), 4);
5929 else
5930 return -EINVAL;
5931
5932 if (copy_from_user(¶ms, optval, len))
5933 return -EFAULT;
5934
5935 /* If an address other than INADDR_ANY is specified, and
5936 * no transport is found, then the request is invalid.
5937 */
5938 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5939 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5940 params.spp_assoc_id);
5941 if (!trans) {
5942 pr_debug("%s: failed no transport\n", __func__);
5943 return -EINVAL;
5944 }
5945 }
5946
5947 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5948 * socket is a one to many style socket, and an association
5949 * was not found, then the id was invalid.
5950 */
5951 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5952 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5953 sctp_style(sk, UDP)) {
5954 pr_debug("%s: failed no association\n", __func__);
5955 return -EINVAL;
5956 }
5957
5958 if (trans) {
5959 /* Fetch transport values. */
5960 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5961 params.spp_pathmtu = trans->pathmtu;
5962 params.spp_pathmaxrxt = trans->pathmaxrxt;
5963 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5964
5965 /*draft-11 doesn't say what to return in spp_flags*/
5966 params.spp_flags = trans->param_flags;
5967 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5968 params.spp_ipv6_flowlabel = trans->flowlabel &
5969 SCTP_FLOWLABEL_VAL_MASK;
5970 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5971 }
5972 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5973 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5974 params.spp_flags |= SPP_DSCP;
5975 }
5976 } else if (asoc) {
5977 /* Fetch association values. */
5978 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5979 params.spp_pathmtu = asoc->pathmtu;
5980 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5981 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5982
5983 /*draft-11 doesn't say what to return in spp_flags*/
5984 params.spp_flags = asoc->param_flags;
5985 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5986 params.spp_ipv6_flowlabel = asoc->flowlabel &
5987 SCTP_FLOWLABEL_VAL_MASK;
5988 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5989 }
5990 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5991 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5992 params.spp_flags |= SPP_DSCP;
5993 }
5994 } else {
5995 /* Fetch socket values. */
5996 params.spp_hbinterval = sp->hbinterval;
5997 params.spp_pathmtu = sp->pathmtu;
5998 params.spp_sackdelay = sp->sackdelay;
5999 params.spp_pathmaxrxt = sp->pathmaxrxt;
6000
6001 /*draft-11 doesn't say what to return in spp_flags*/
6002 params.spp_flags = sp->param_flags;
6003 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6004 params.spp_ipv6_flowlabel = sp->flowlabel &
6005 SCTP_FLOWLABEL_VAL_MASK;
6006 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6007 }
6008 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6009 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6010 params.spp_flags |= SPP_DSCP;
6011 }
6012 }
6013
6014 if (copy_to_user(optval, ¶ms, len))
6015 return -EFAULT;
6016
6017 if (put_user(len, optlen))
6018 return -EFAULT;
6019
6020 return 0;
6021}
6022
6023/*
6024 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6025 *
6026 * This option will effect the way delayed acks are performed. This
6027 * option allows you to get or set the delayed ack time, in
6028 * milliseconds. It also allows changing the delayed ack frequency.
6029 * Changing the frequency to 1 disables the delayed sack algorithm. If
6030 * the assoc_id is 0, then this sets or gets the endpoints default
6031 * values. If the assoc_id field is non-zero, then the set or get
6032 * effects the specified association for the one to many model (the
6033 * assoc_id field is ignored by the one to one model). Note that if
6034 * sack_delay or sack_freq are 0 when setting this option, then the
6035 * current values will remain unchanged.
6036 *
6037 * struct sctp_sack_info {
6038 * sctp_assoc_t sack_assoc_id;
6039 * uint32_t sack_delay;
6040 * uint32_t sack_freq;
6041 * };
6042 *
6043 * sack_assoc_id - This parameter, indicates which association the user
6044 * is performing an action upon. Note that if this field's value is
6045 * zero then the endpoints default value is changed (effecting future
6046 * associations only).
6047 *
6048 * sack_delay - This parameter contains the number of milliseconds that
6049 * the user is requesting the delayed ACK timer be set to. Note that
6050 * this value is defined in the standard to be between 200 and 500
6051 * milliseconds.
6052 *
6053 * sack_freq - This parameter contains the number of packets that must
6054 * be received before a sack is sent without waiting for the delay
6055 * timer to expire. The default value for this is 2, setting this
6056 * value to 1 will disable the delayed sack algorithm.
6057 */
6058static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6059 char __user *optval,
6060 int __user *optlen)
6061{
6062 struct sctp_sack_info params;
6063 struct sctp_association *asoc = NULL;
6064 struct sctp_sock *sp = sctp_sk(sk);
6065
6066 if (len >= sizeof(struct sctp_sack_info)) {
6067 len = sizeof(struct sctp_sack_info);
6068
6069 if (copy_from_user(¶ms, optval, len))
6070 return -EFAULT;
6071 } else if (len == sizeof(struct sctp_assoc_value)) {
6072 pr_warn_ratelimited(DEPRECATED
6073 "%s (pid %d) "
6074 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6075 "Use struct sctp_sack_info instead\n",
6076 current->comm, task_pid_nr(current));
6077 if (copy_from_user(¶ms, optval, len))
6078 return -EFAULT;
6079 } else
6080 return -EINVAL;
6081
6082 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6083 * socket is a one to many style socket, and an association
6084 * was not found, then the id was invalid.
6085 */
6086 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6087 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6088 sctp_style(sk, UDP))
6089 return -EINVAL;
6090
6091 if (asoc) {
6092 /* Fetch association values. */
6093 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6094 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6095 params.sack_freq = asoc->sackfreq;
6096
6097 } else {
6098 params.sack_delay = 0;
6099 params.sack_freq = 1;
6100 }
6101 } else {
6102 /* Fetch socket values. */
6103 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6104 params.sack_delay = sp->sackdelay;
6105 params.sack_freq = sp->sackfreq;
6106 } else {
6107 params.sack_delay = 0;
6108 params.sack_freq = 1;
6109 }
6110 }
6111
6112 if (copy_to_user(optval, ¶ms, len))
6113 return -EFAULT;
6114
6115 if (put_user(len, optlen))
6116 return -EFAULT;
6117
6118 return 0;
6119}
6120
6121/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6122 *
6123 * Applications can specify protocol parameters for the default association
6124 * initialization. The option name argument to setsockopt() and getsockopt()
6125 * is SCTP_INITMSG.
6126 *
6127 * Setting initialization parameters is effective only on an unconnected
6128 * socket (for UDP-style sockets only future associations are effected
6129 * by the change). With TCP-style sockets, this option is inherited by
6130 * sockets derived from a listener socket.
6131 */
6132static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6133{
6134 if (len < sizeof(struct sctp_initmsg))
6135 return -EINVAL;
6136 len = sizeof(struct sctp_initmsg);
6137 if (put_user(len, optlen))
6138 return -EFAULT;
6139 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6140 return -EFAULT;
6141 return 0;
6142}
6143
6144
6145static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6146 char __user *optval, int __user *optlen)
6147{
6148 struct sctp_association *asoc;
6149 int cnt = 0;
6150 struct sctp_getaddrs getaddrs;
6151 struct sctp_transport *from;
6152 void __user *to;
6153 union sctp_addr temp;
6154 struct sctp_sock *sp = sctp_sk(sk);
6155 int addrlen;
6156 size_t space_left;
6157 int bytes_copied;
6158
6159 if (len < sizeof(struct sctp_getaddrs))
6160 return -EINVAL;
6161
6162 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6163 return -EFAULT;
6164
6165 /* For UDP-style sockets, id specifies the association to query. */
6166 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6167 if (!asoc)
6168 return -EINVAL;
6169
6170 to = optval + offsetof(struct sctp_getaddrs, addrs);
6171 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6172
6173 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6174 transports) {
6175 memcpy(&temp, &from->ipaddr, sizeof(temp));
6176 addrlen = sctp_get_pf_specific(sk->sk_family)
6177 ->addr_to_user(sp, &temp);
6178 if (space_left < addrlen)
6179 return -ENOMEM;
6180 if (copy_to_user(to, &temp, addrlen))
6181 return -EFAULT;
6182 to += addrlen;
6183 cnt++;
6184 space_left -= addrlen;
6185 }
6186
6187 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6188 return -EFAULT;
6189 bytes_copied = ((char __user *)to) - optval;
6190 if (put_user(bytes_copied, optlen))
6191 return -EFAULT;
6192
6193 return 0;
6194}
6195
6196static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6197 size_t space_left, int *bytes_copied)
6198{
6199 struct sctp_sockaddr_entry *addr;
6200 union sctp_addr temp;
6201 int cnt = 0;
6202 int addrlen;
6203 struct net *net = sock_net(sk);
6204
6205 rcu_read_lock();
6206 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6207 if (!addr->valid)
6208 continue;
6209
6210 if ((PF_INET == sk->sk_family) &&
6211 (AF_INET6 == addr->a.sa.sa_family))
6212 continue;
6213 if ((PF_INET6 == sk->sk_family) &&
6214 inet_v6_ipv6only(sk) &&
6215 (AF_INET == addr->a.sa.sa_family))
6216 continue;
6217 memcpy(&temp, &addr->a, sizeof(temp));
6218 if (!temp.v4.sin_port)
6219 temp.v4.sin_port = htons(port);
6220
6221 addrlen = sctp_get_pf_specific(sk->sk_family)
6222 ->addr_to_user(sctp_sk(sk), &temp);
6223
6224 if (space_left < addrlen) {
6225 cnt = -ENOMEM;
6226 break;
6227 }
6228 memcpy(to, &temp, addrlen);
6229
6230 to += addrlen;
6231 cnt++;
6232 space_left -= addrlen;
6233 *bytes_copied += addrlen;
6234 }
6235 rcu_read_unlock();
6236
6237 return cnt;
6238}
6239
6240
6241static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6242 char __user *optval, int __user *optlen)
6243{
6244 struct sctp_bind_addr *bp;
6245 struct sctp_association *asoc;
6246 int cnt = 0;
6247 struct sctp_getaddrs getaddrs;
6248 struct sctp_sockaddr_entry *addr;
6249 void __user *to;
6250 union sctp_addr temp;
6251 struct sctp_sock *sp = sctp_sk(sk);
6252 int addrlen;
6253 int err = 0;
6254 size_t space_left;
6255 int bytes_copied = 0;
6256 void *addrs;
6257 void *buf;
6258
6259 if (len < sizeof(struct sctp_getaddrs))
6260 return -EINVAL;
6261
6262 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6263 return -EFAULT;
6264
6265 /*
6266 * For UDP-style sockets, id specifies the association to query.
6267 * If the id field is set to the value '0' then the locally bound
6268 * addresses are returned without regard to any particular
6269 * association.
6270 */
6271 if (0 == getaddrs.assoc_id) {
6272 bp = &sctp_sk(sk)->ep->base.bind_addr;
6273 } else {
6274 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6275 if (!asoc)
6276 return -EINVAL;
6277 bp = &asoc->base.bind_addr;
6278 }
6279
6280 to = optval + offsetof(struct sctp_getaddrs, addrs);
6281 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6282
6283 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6284 if (!addrs)
6285 return -ENOMEM;
6286
6287 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6288 * addresses from the global local address list.
6289 */
6290 if (sctp_list_single_entry(&bp->address_list)) {
6291 addr = list_entry(bp->address_list.next,
6292 struct sctp_sockaddr_entry, list);
6293 if (sctp_is_any(sk, &addr->a)) {
6294 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6295 space_left, &bytes_copied);
6296 if (cnt < 0) {
6297 err = cnt;
6298 goto out;
6299 }
6300 goto copy_getaddrs;
6301 }
6302 }
6303
6304 buf = addrs;
6305 /* Protection on the bound address list is not needed since
6306 * in the socket option context we hold a socket lock and
6307 * thus the bound address list can't change.
6308 */
6309 list_for_each_entry(addr, &bp->address_list, list) {
6310 memcpy(&temp, &addr->a, sizeof(temp));
6311 addrlen = sctp_get_pf_specific(sk->sk_family)
6312 ->addr_to_user(sp, &temp);
6313 if (space_left < addrlen) {
6314 err = -ENOMEM; /*fixme: right error?*/
6315 goto out;
6316 }
6317 memcpy(buf, &temp, addrlen);
6318 buf += addrlen;
6319 bytes_copied += addrlen;
6320 cnt++;
6321 space_left -= addrlen;
6322 }
6323
6324copy_getaddrs:
6325 if (copy_to_user(to, addrs, bytes_copied)) {
6326 err = -EFAULT;
6327 goto out;
6328 }
6329 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6330 err = -EFAULT;
6331 goto out;
6332 }
6333 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6334 * but we can't change it anymore.
6335 */
6336 if (put_user(bytes_copied, optlen))
6337 err = -EFAULT;
6338out:
6339 kfree(addrs);
6340 return err;
6341}
6342
6343/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6344 *
6345 * Requests that the local SCTP stack use the enclosed peer address as
6346 * the association primary. The enclosed address must be one of the
6347 * association peer's addresses.
6348 */
6349static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6350 char __user *optval, int __user *optlen)
6351{
6352 struct sctp_prim prim;
6353 struct sctp_association *asoc;
6354 struct sctp_sock *sp = sctp_sk(sk);
6355
6356 if (len < sizeof(struct sctp_prim))
6357 return -EINVAL;
6358
6359 len = sizeof(struct sctp_prim);
6360
6361 if (copy_from_user(&prim, optval, len))
6362 return -EFAULT;
6363
6364 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6365 if (!asoc)
6366 return -EINVAL;
6367
6368 if (!asoc->peer.primary_path)
6369 return -ENOTCONN;
6370
6371 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6372 asoc->peer.primary_path->af_specific->sockaddr_len);
6373
6374 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6375 (union sctp_addr *)&prim.ssp_addr);
6376
6377 if (put_user(len, optlen))
6378 return -EFAULT;
6379 if (copy_to_user(optval, &prim, len))
6380 return -EFAULT;
6381
6382 return 0;
6383}
6384
6385/*
6386 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6387 *
6388 * Requests that the local endpoint set the specified Adaptation Layer
6389 * Indication parameter for all future INIT and INIT-ACK exchanges.
6390 */
6391static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6392 char __user *optval, int __user *optlen)
6393{
6394 struct sctp_setadaptation adaptation;
6395
6396 if (len < sizeof(struct sctp_setadaptation))
6397 return -EINVAL;
6398
6399 len = sizeof(struct sctp_setadaptation);
6400
6401 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6402
6403 if (put_user(len, optlen))
6404 return -EFAULT;
6405 if (copy_to_user(optval, &adaptation, len))
6406 return -EFAULT;
6407
6408 return 0;
6409}
6410
6411/*
6412 *
6413 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6414 *
6415 * Applications that wish to use the sendto() system call may wish to
6416 * specify a default set of parameters that would normally be supplied
6417 * through the inclusion of ancillary data. This socket option allows
6418 * such an application to set the default sctp_sndrcvinfo structure.
6419
6420
6421 * The application that wishes to use this socket option simply passes
6422 * in to this call the sctp_sndrcvinfo structure defined in Section
6423 * 5.2.2) The input parameters accepted by this call include
6424 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6425 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6426 * to this call if the caller is using the UDP model.
6427 *
6428 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6429 */
6430static int sctp_getsockopt_default_send_param(struct sock *sk,
6431 int len, char __user *optval,
6432 int __user *optlen)
6433{
6434 struct sctp_sock *sp = sctp_sk(sk);
6435 struct sctp_association *asoc;
6436 struct sctp_sndrcvinfo info;
6437
6438 if (len < sizeof(info))
6439 return -EINVAL;
6440
6441 len = sizeof(info);
6442
6443 if (copy_from_user(&info, optval, len))
6444 return -EFAULT;
6445
6446 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6447 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6448 sctp_style(sk, UDP))
6449 return -EINVAL;
6450
6451 if (asoc) {
6452 info.sinfo_stream = asoc->default_stream;
6453 info.sinfo_flags = asoc->default_flags;
6454 info.sinfo_ppid = asoc->default_ppid;
6455 info.sinfo_context = asoc->default_context;
6456 info.sinfo_timetolive = asoc->default_timetolive;
6457 } else {
6458 info.sinfo_stream = sp->default_stream;
6459 info.sinfo_flags = sp->default_flags;
6460 info.sinfo_ppid = sp->default_ppid;
6461 info.sinfo_context = sp->default_context;
6462 info.sinfo_timetolive = sp->default_timetolive;
6463 }
6464
6465 if (put_user(len, optlen))
6466 return -EFAULT;
6467 if (copy_to_user(optval, &info, len))
6468 return -EFAULT;
6469
6470 return 0;
6471}
6472
6473/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6474 * (SCTP_DEFAULT_SNDINFO)
6475 */
6476static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6477 char __user *optval,
6478 int __user *optlen)
6479{
6480 struct sctp_sock *sp = sctp_sk(sk);
6481 struct sctp_association *asoc;
6482 struct sctp_sndinfo info;
6483
6484 if (len < sizeof(info))
6485 return -EINVAL;
6486
6487 len = sizeof(info);
6488
6489 if (copy_from_user(&info, optval, len))
6490 return -EFAULT;
6491
6492 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6493 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6494 sctp_style(sk, UDP))
6495 return -EINVAL;
6496
6497 if (asoc) {
6498 info.snd_sid = asoc->default_stream;
6499 info.snd_flags = asoc->default_flags;
6500 info.snd_ppid = asoc->default_ppid;
6501 info.snd_context = asoc->default_context;
6502 } else {
6503 info.snd_sid = sp->default_stream;
6504 info.snd_flags = sp->default_flags;
6505 info.snd_ppid = sp->default_ppid;
6506 info.snd_context = sp->default_context;
6507 }
6508
6509 if (put_user(len, optlen))
6510 return -EFAULT;
6511 if (copy_to_user(optval, &info, len))
6512 return -EFAULT;
6513
6514 return 0;
6515}
6516
6517/*
6518 *
6519 * 7.1.5 SCTP_NODELAY
6520 *
6521 * Turn on/off any Nagle-like algorithm. This means that packets are
6522 * generally sent as soon as possible and no unnecessary delays are
6523 * introduced, at the cost of more packets in the network. Expects an
6524 * integer boolean flag.
6525 */
6526
6527static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6528 char __user *optval, int __user *optlen)
6529{
6530 int val;
6531
6532 if (len < sizeof(int))
6533 return -EINVAL;
6534
6535 len = sizeof(int);
6536 val = (sctp_sk(sk)->nodelay == 1);
6537 if (put_user(len, optlen))
6538 return -EFAULT;
6539 if (copy_to_user(optval, &val, len))
6540 return -EFAULT;
6541 return 0;
6542}
6543
6544/*
6545 *
6546 * 7.1.1 SCTP_RTOINFO
6547 *
6548 * The protocol parameters used to initialize and bound retransmission
6549 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6550 * and modify these parameters.
6551 * All parameters are time values, in milliseconds. A value of 0, when
6552 * modifying the parameters, indicates that the current value should not
6553 * be changed.
6554 *
6555 */
6556static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6557 char __user *optval,
6558 int __user *optlen) {
6559 struct sctp_rtoinfo rtoinfo;
6560 struct sctp_association *asoc;
6561
6562 if (len < sizeof (struct sctp_rtoinfo))
6563 return -EINVAL;
6564
6565 len = sizeof(struct sctp_rtoinfo);
6566
6567 if (copy_from_user(&rtoinfo, optval, len))
6568 return -EFAULT;
6569
6570 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6571
6572 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6573 sctp_style(sk, UDP))
6574 return -EINVAL;
6575
6576 /* Values corresponding to the specific association. */
6577 if (asoc) {
6578 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6579 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6580 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6581 } else {
6582 /* Values corresponding to the endpoint. */
6583 struct sctp_sock *sp = sctp_sk(sk);
6584
6585 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6586 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6587 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6588 }
6589
6590 if (put_user(len, optlen))
6591 return -EFAULT;
6592
6593 if (copy_to_user(optval, &rtoinfo, len))
6594 return -EFAULT;
6595
6596 return 0;
6597}
6598
6599/*
6600 *
6601 * 7.1.2 SCTP_ASSOCINFO
6602 *
6603 * This option is used to tune the maximum retransmission attempts
6604 * of the association.
6605 * Returns an error if the new association retransmission value is
6606 * greater than the sum of the retransmission value of the peer.
6607 * See [SCTP] for more information.
6608 *
6609 */
6610static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6611 char __user *optval,
6612 int __user *optlen)
6613{
6614
6615 struct sctp_assocparams assocparams;
6616 struct sctp_association *asoc;
6617 struct list_head *pos;
6618 int cnt = 0;
6619
6620 if (len < sizeof (struct sctp_assocparams))
6621 return -EINVAL;
6622
6623 len = sizeof(struct sctp_assocparams);
6624
6625 if (copy_from_user(&assocparams, optval, len))
6626 return -EFAULT;
6627
6628 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6629
6630 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6631 sctp_style(sk, UDP))
6632 return -EINVAL;
6633
6634 /* Values correspoinding to the specific association */
6635 if (asoc) {
6636 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6637 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6638 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6639 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6640
6641 list_for_each(pos, &asoc->peer.transport_addr_list) {
6642 cnt++;
6643 }
6644
6645 assocparams.sasoc_number_peer_destinations = cnt;
6646 } else {
6647 /* Values corresponding to the endpoint */
6648 struct sctp_sock *sp = sctp_sk(sk);
6649
6650 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6651 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6652 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6653 assocparams.sasoc_cookie_life =
6654 sp->assocparams.sasoc_cookie_life;
6655 assocparams.sasoc_number_peer_destinations =
6656 sp->assocparams.
6657 sasoc_number_peer_destinations;
6658 }
6659
6660 if (put_user(len, optlen))
6661 return -EFAULT;
6662
6663 if (copy_to_user(optval, &assocparams, len))
6664 return -EFAULT;
6665
6666 return 0;
6667}
6668
6669/*
6670 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6671 *
6672 * This socket option is a boolean flag which turns on or off mapped V4
6673 * addresses. If this option is turned on and the socket is type
6674 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6675 * If this option is turned off, then no mapping will be done of V4
6676 * addresses and a user will receive both PF_INET6 and PF_INET type
6677 * addresses on the socket.
6678 */
6679static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6680 char __user *optval, int __user *optlen)
6681{
6682 int val;
6683 struct sctp_sock *sp = sctp_sk(sk);
6684
6685 if (len < sizeof(int))
6686 return -EINVAL;
6687
6688 len = sizeof(int);
6689 val = sp->v4mapped;
6690 if (put_user(len, optlen))
6691 return -EFAULT;
6692 if (copy_to_user(optval, &val, len))
6693 return -EFAULT;
6694
6695 return 0;
6696}
6697
6698/*
6699 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6700 * (chapter and verse is quoted at sctp_setsockopt_context())
6701 */
6702static int sctp_getsockopt_context(struct sock *sk, int len,
6703 char __user *optval, int __user *optlen)
6704{
6705 struct sctp_assoc_value params;
6706 struct sctp_association *asoc;
6707
6708 if (len < sizeof(struct sctp_assoc_value))
6709 return -EINVAL;
6710
6711 len = sizeof(struct sctp_assoc_value);
6712
6713 if (copy_from_user(¶ms, optval, len))
6714 return -EFAULT;
6715
6716 asoc = sctp_id2assoc(sk, params.assoc_id);
6717 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6718 sctp_style(sk, UDP))
6719 return -EINVAL;
6720
6721 params.assoc_value = asoc ? asoc->default_rcv_context
6722 : sctp_sk(sk)->default_rcv_context;
6723
6724 if (put_user(len, optlen))
6725 return -EFAULT;
6726 if (copy_to_user(optval, ¶ms, len))
6727 return -EFAULT;
6728
6729 return 0;
6730}
6731
6732/*
6733 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6734 * This option will get or set the maximum size to put in any outgoing
6735 * SCTP DATA chunk. If a message is larger than this size it will be
6736 * fragmented by SCTP into the specified size. Note that the underlying
6737 * SCTP implementation may fragment into smaller sized chunks when the
6738 * PMTU of the underlying association is smaller than the value set by
6739 * the user. The default value for this option is '0' which indicates
6740 * the user is NOT limiting fragmentation and only the PMTU will effect
6741 * SCTP's choice of DATA chunk size. Note also that values set larger
6742 * than the maximum size of an IP datagram will effectively let SCTP
6743 * control fragmentation (i.e. the same as setting this option to 0).
6744 *
6745 * The following structure is used to access and modify this parameter:
6746 *
6747 * struct sctp_assoc_value {
6748 * sctp_assoc_t assoc_id;
6749 * uint32_t assoc_value;
6750 * };
6751 *
6752 * assoc_id: This parameter is ignored for one-to-one style sockets.
6753 * For one-to-many style sockets this parameter indicates which
6754 * association the user is performing an action upon. Note that if
6755 * this field's value is zero then the endpoints default value is
6756 * changed (effecting future associations only).
6757 * assoc_value: This parameter specifies the maximum size in bytes.
6758 */
6759static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6760 char __user *optval, int __user *optlen)
6761{
6762 struct sctp_assoc_value params;
6763 struct sctp_association *asoc;
6764
6765 if (len == sizeof(int)) {
6766 pr_warn_ratelimited(DEPRECATED
6767 "%s (pid %d) "
6768 "Use of int in maxseg socket option.\n"
6769 "Use struct sctp_assoc_value instead\n",
6770 current->comm, task_pid_nr(current));
6771 params.assoc_id = SCTP_FUTURE_ASSOC;
6772 } else if (len >= sizeof(struct sctp_assoc_value)) {
6773 len = sizeof(struct sctp_assoc_value);
6774 if (copy_from_user(¶ms, optval, len))
6775 return -EFAULT;
6776 } else
6777 return -EINVAL;
6778
6779 asoc = sctp_id2assoc(sk, params.assoc_id);
6780 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6781 sctp_style(sk, UDP))
6782 return -EINVAL;
6783
6784 if (asoc)
6785 params.assoc_value = asoc->frag_point;
6786 else
6787 params.assoc_value = sctp_sk(sk)->user_frag;
6788
6789 if (put_user(len, optlen))
6790 return -EFAULT;
6791 if (len == sizeof(int)) {
6792 if (copy_to_user(optval, ¶ms.assoc_value, len))
6793 return -EFAULT;
6794 } else {
6795 if (copy_to_user(optval, ¶ms, len))
6796 return -EFAULT;
6797 }
6798
6799 return 0;
6800}
6801
6802/*
6803 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6804 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6805 */
6806static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6807 char __user *optval, int __user *optlen)
6808{
6809 int val;
6810
6811 if (len < sizeof(int))
6812 return -EINVAL;
6813
6814 len = sizeof(int);
6815
6816 val = sctp_sk(sk)->frag_interleave;
6817 if (put_user(len, optlen))
6818 return -EFAULT;
6819 if (copy_to_user(optval, &val, len))
6820 return -EFAULT;
6821
6822 return 0;
6823}
6824
6825/*
6826 * 7.1.25. Set or Get the sctp partial delivery point
6827 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6828 */
6829static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6830 char __user *optval,
6831 int __user *optlen)
6832{
6833 u32 val;
6834
6835 if (len < sizeof(u32))
6836 return -EINVAL;
6837
6838 len = sizeof(u32);
6839
6840 val = sctp_sk(sk)->pd_point;
6841 if (put_user(len, optlen))
6842 return -EFAULT;
6843 if (copy_to_user(optval, &val, len))
6844 return -EFAULT;
6845
6846 return 0;
6847}
6848
6849/*
6850 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6851 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6852 */
6853static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6854 char __user *optval,
6855 int __user *optlen)
6856{
6857 struct sctp_assoc_value params;
6858 struct sctp_association *asoc;
6859
6860 if (len == sizeof(int)) {
6861 pr_warn_ratelimited(DEPRECATED
6862 "%s (pid %d) "
6863 "Use of int in max_burst socket option.\n"
6864 "Use struct sctp_assoc_value instead\n",
6865 current->comm, task_pid_nr(current));
6866 params.assoc_id = SCTP_FUTURE_ASSOC;
6867 } else if (len >= sizeof(struct sctp_assoc_value)) {
6868 len = sizeof(struct sctp_assoc_value);
6869 if (copy_from_user(¶ms, optval, len))
6870 return -EFAULT;
6871 } else
6872 return -EINVAL;
6873
6874 asoc = sctp_id2assoc(sk, params.assoc_id);
6875 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6876 sctp_style(sk, UDP))
6877 return -EINVAL;
6878
6879 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6880
6881 if (len == sizeof(int)) {
6882 if (copy_to_user(optval, ¶ms.assoc_value, len))
6883 return -EFAULT;
6884 } else {
6885 if (copy_to_user(optval, ¶ms, len))
6886 return -EFAULT;
6887 }
6888
6889 return 0;
6890
6891}
6892
6893static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6894 char __user *optval, int __user *optlen)
6895{
6896 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6897 struct sctp_hmacalgo __user *p = (void __user *)optval;
6898 struct sctp_hmac_algo_param *hmacs;
6899 __u16 data_len = 0;
6900 u32 num_idents;
6901 int i;
6902
6903 if (!ep->auth_enable)
6904 return -EACCES;
6905
6906 hmacs = ep->auth_hmacs_list;
6907 data_len = ntohs(hmacs->param_hdr.length) -
6908 sizeof(struct sctp_paramhdr);
6909
6910 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6911 return -EINVAL;
6912
6913 len = sizeof(struct sctp_hmacalgo) + data_len;
6914 num_idents = data_len / sizeof(u16);
6915
6916 if (put_user(len, optlen))
6917 return -EFAULT;
6918 if (put_user(num_idents, &p->shmac_num_idents))
6919 return -EFAULT;
6920 for (i = 0; i < num_idents; i++) {
6921 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6922
6923 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6924 return -EFAULT;
6925 }
6926 return 0;
6927}
6928
6929static int sctp_getsockopt_active_key(struct sock *sk, int len,
6930 char __user *optval, int __user *optlen)
6931{
6932 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6933 struct sctp_authkeyid val;
6934 struct sctp_association *asoc;
6935
6936 if (len < sizeof(struct sctp_authkeyid))
6937 return -EINVAL;
6938
6939 len = sizeof(struct sctp_authkeyid);
6940 if (copy_from_user(&val, optval, len))
6941 return -EFAULT;
6942
6943 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6944 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6945 return -EINVAL;
6946
6947 if (asoc) {
6948 if (!asoc->peer.auth_capable)
6949 return -EACCES;
6950 val.scact_keynumber = asoc->active_key_id;
6951 } else {
6952 if (!ep->auth_enable)
6953 return -EACCES;
6954 val.scact_keynumber = ep->active_key_id;
6955 }
6956
6957 if (put_user(len, optlen))
6958 return -EFAULT;
6959 if (copy_to_user(optval, &val, len))
6960 return -EFAULT;
6961
6962 return 0;
6963}
6964
6965static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6966 char __user *optval, int __user *optlen)
6967{
6968 struct sctp_authchunks __user *p = (void __user *)optval;
6969 struct sctp_authchunks val;
6970 struct sctp_association *asoc;
6971 struct sctp_chunks_param *ch;
6972 u32 num_chunks = 0;
6973 char __user *to;
6974
6975 if (len < sizeof(struct sctp_authchunks))
6976 return -EINVAL;
6977
6978 if (copy_from_user(&val, optval, sizeof(val)))
6979 return -EFAULT;
6980
6981 to = p->gauth_chunks;
6982 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6983 if (!asoc)
6984 return -EINVAL;
6985
6986 if (!asoc->peer.auth_capable)
6987 return -EACCES;
6988
6989 ch = asoc->peer.peer_chunks;
6990 if (!ch)
6991 goto num;
6992
6993 /* See if the user provided enough room for all the data */
6994 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6995 if (len < num_chunks)
6996 return -EINVAL;
6997
6998 if (copy_to_user(to, ch->chunks, num_chunks))
6999 return -EFAULT;
7000num:
7001 len = sizeof(struct sctp_authchunks) + num_chunks;
7002 if (put_user(len, optlen))
7003 return -EFAULT;
7004 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7005 return -EFAULT;
7006 return 0;
7007}
7008
7009static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7010 char __user *optval, int __user *optlen)
7011{
7012 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7013 struct sctp_authchunks __user *p = (void __user *)optval;
7014 struct sctp_authchunks val;
7015 struct sctp_association *asoc;
7016 struct sctp_chunks_param *ch;
7017 u32 num_chunks = 0;
7018 char __user *to;
7019
7020 if (len < sizeof(struct sctp_authchunks))
7021 return -EINVAL;
7022
7023 if (copy_from_user(&val, optval, sizeof(val)))
7024 return -EFAULT;
7025
7026 to = p->gauth_chunks;
7027 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7028 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7029 sctp_style(sk, UDP))
7030 return -EINVAL;
7031
7032 if (asoc) {
7033 if (!asoc->peer.auth_capable)
7034 return -EACCES;
7035 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7036 } else {
7037 if (!ep->auth_enable)
7038 return -EACCES;
7039 ch = ep->auth_chunk_list;
7040 }
7041 if (!ch)
7042 goto num;
7043
7044 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7045 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7046 return -EINVAL;
7047
7048 if (copy_to_user(to, ch->chunks, num_chunks))
7049 return -EFAULT;
7050num:
7051 len = sizeof(struct sctp_authchunks) + num_chunks;
7052 if (put_user(len, optlen))
7053 return -EFAULT;
7054 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7055 return -EFAULT;
7056
7057 return 0;
7058}
7059
7060/*
7061 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7062 * This option gets the current number of associations that are attached
7063 * to a one-to-many style socket. The option value is an uint32_t.
7064 */
7065static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7066 char __user *optval, int __user *optlen)
7067{
7068 struct sctp_sock *sp = sctp_sk(sk);
7069 struct sctp_association *asoc;
7070 u32 val = 0;
7071
7072 if (sctp_style(sk, TCP))
7073 return -EOPNOTSUPP;
7074
7075 if (len < sizeof(u32))
7076 return -EINVAL;
7077
7078 len = sizeof(u32);
7079
7080 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7081 val++;
7082 }
7083
7084 if (put_user(len, optlen))
7085 return -EFAULT;
7086 if (copy_to_user(optval, &val, len))
7087 return -EFAULT;
7088
7089 return 0;
7090}
7091
7092/*
7093 * 8.1.23 SCTP_AUTO_ASCONF
7094 * See the corresponding setsockopt entry as description
7095 */
7096static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7097 char __user *optval, int __user *optlen)
7098{
7099 int val = 0;
7100
7101 if (len < sizeof(int))
7102 return -EINVAL;
7103
7104 len = sizeof(int);
7105 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7106 val = 1;
7107 if (put_user(len, optlen))
7108 return -EFAULT;
7109 if (copy_to_user(optval, &val, len))
7110 return -EFAULT;
7111 return 0;
7112}
7113
7114/*
7115 * 8.2.6. Get the Current Identifiers of Associations
7116 * (SCTP_GET_ASSOC_ID_LIST)
7117 *
7118 * This option gets the current list of SCTP association identifiers of
7119 * the SCTP associations handled by a one-to-many style socket.
7120 */
7121static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7122 char __user *optval, int __user *optlen)
7123{
7124 struct sctp_sock *sp = sctp_sk(sk);
7125 struct sctp_association *asoc;
7126 struct sctp_assoc_ids *ids;
7127 size_t ids_size;
7128 u32 num = 0;
7129
7130 if (sctp_style(sk, TCP))
7131 return -EOPNOTSUPP;
7132
7133 if (len < sizeof(struct sctp_assoc_ids))
7134 return -EINVAL;
7135
7136 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7137 num++;
7138 }
7139
7140 ids_size = struct_size(ids, gaids_assoc_id, num);
7141 if (len < ids_size)
7142 return -EINVAL;
7143
7144 len = ids_size;
7145 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7146 if (unlikely(!ids))
7147 return -ENOMEM;
7148
7149 ids->gaids_number_of_ids = num;
7150 num = 0;
7151 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7152 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7153 }
7154
7155 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7156 kfree(ids);
7157 return -EFAULT;
7158 }
7159
7160 kfree(ids);
7161 return 0;
7162}
7163
7164/*
7165 * SCTP_PEER_ADDR_THLDS
7166 *
7167 * This option allows us to fetch the partially failed threshold for one or all
7168 * transports in an association. See Section 6.1 of:
7169 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7170 */
7171static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7172 char __user *optval, int len,
7173 int __user *optlen, bool v2)
7174{
7175 struct sctp_paddrthlds_v2 val;
7176 struct sctp_transport *trans;
7177 struct sctp_association *asoc;
7178 int min;
7179
7180 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7181 if (len < min)
7182 return -EINVAL;
7183 len = min;
7184 if (copy_from_user(&val, optval, len))
7185 return -EFAULT;
7186
7187 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7188 trans = sctp_addr_id2transport(sk, &val.spt_address,
7189 val.spt_assoc_id);
7190 if (!trans)
7191 return -ENOENT;
7192
7193 val.spt_pathmaxrxt = trans->pathmaxrxt;
7194 val.spt_pathpfthld = trans->pf_retrans;
7195 val.spt_pathcpthld = trans->ps_retrans;
7196
7197 goto out;
7198 }
7199
7200 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7201 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7202 sctp_style(sk, UDP))
7203 return -EINVAL;
7204
7205 if (asoc) {
7206 val.spt_pathpfthld = asoc->pf_retrans;
7207 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7208 val.spt_pathcpthld = asoc->ps_retrans;
7209 } else {
7210 struct sctp_sock *sp = sctp_sk(sk);
7211
7212 val.spt_pathpfthld = sp->pf_retrans;
7213 val.spt_pathmaxrxt = sp->pathmaxrxt;
7214 val.spt_pathcpthld = sp->ps_retrans;
7215 }
7216
7217out:
7218 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7219 return -EFAULT;
7220
7221 return 0;
7222}
7223
7224/*
7225 * SCTP_GET_ASSOC_STATS
7226 *
7227 * This option retrieves local per endpoint statistics. It is modeled
7228 * after OpenSolaris' implementation
7229 */
7230static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7231 char __user *optval,
7232 int __user *optlen)
7233{
7234 struct sctp_assoc_stats sas;
7235 struct sctp_association *asoc = NULL;
7236
7237 /* User must provide at least the assoc id */
7238 if (len < sizeof(sctp_assoc_t))
7239 return -EINVAL;
7240
7241 /* Allow the struct to grow and fill in as much as possible */
7242 len = min_t(size_t, len, sizeof(sas));
7243
7244 if (copy_from_user(&sas, optval, len))
7245 return -EFAULT;
7246
7247 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7248 if (!asoc)
7249 return -EINVAL;
7250
7251 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7252 sas.sas_gapcnt = asoc->stats.gapcnt;
7253 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7254 sas.sas_osacks = asoc->stats.osacks;
7255 sas.sas_isacks = asoc->stats.isacks;
7256 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7257 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7258 sas.sas_oodchunks = asoc->stats.oodchunks;
7259 sas.sas_iodchunks = asoc->stats.iodchunks;
7260 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7261 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7262 sas.sas_idupchunks = asoc->stats.idupchunks;
7263 sas.sas_opackets = asoc->stats.opackets;
7264 sas.sas_ipackets = asoc->stats.ipackets;
7265
7266 /* New high max rto observed, will return 0 if not a single
7267 * RTO update took place. obs_rto_ipaddr will be bogus
7268 * in such a case
7269 */
7270 sas.sas_maxrto = asoc->stats.max_obs_rto;
7271 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7272 sizeof(struct sockaddr_storage));
7273
7274 /* Mark beginning of a new observation period */
7275 asoc->stats.max_obs_rto = asoc->rto_min;
7276
7277 if (put_user(len, optlen))
7278 return -EFAULT;
7279
7280 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7281
7282 if (copy_to_user(optval, &sas, len))
7283 return -EFAULT;
7284
7285 return 0;
7286}
7287
7288static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7289 char __user *optval,
7290 int __user *optlen)
7291{
7292 int val = 0;
7293
7294 if (len < sizeof(int))
7295 return -EINVAL;
7296
7297 len = sizeof(int);
7298 if (sctp_sk(sk)->recvrcvinfo)
7299 val = 1;
7300 if (put_user(len, optlen))
7301 return -EFAULT;
7302 if (copy_to_user(optval, &val, len))
7303 return -EFAULT;
7304
7305 return 0;
7306}
7307
7308static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7309 char __user *optval,
7310 int __user *optlen)
7311{
7312 int val = 0;
7313
7314 if (len < sizeof(int))
7315 return -EINVAL;
7316
7317 len = sizeof(int);
7318 if (sctp_sk(sk)->recvnxtinfo)
7319 val = 1;
7320 if (put_user(len, optlen))
7321 return -EFAULT;
7322 if (copy_to_user(optval, &val, len))
7323 return -EFAULT;
7324
7325 return 0;
7326}
7327
7328static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7329 char __user *optval,
7330 int __user *optlen)
7331{
7332 struct sctp_assoc_value params;
7333 struct sctp_association *asoc;
7334 int retval = -EFAULT;
7335
7336 if (len < sizeof(params)) {
7337 retval = -EINVAL;
7338 goto out;
7339 }
7340
7341 len = sizeof(params);
7342 if (copy_from_user(¶ms, optval, len))
7343 goto out;
7344
7345 asoc = sctp_id2assoc(sk, params.assoc_id);
7346 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7347 sctp_style(sk, UDP)) {
7348 retval = -EINVAL;
7349 goto out;
7350 }
7351
7352 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7353 : sctp_sk(sk)->ep->prsctp_enable;
7354
7355 if (put_user(len, optlen))
7356 goto out;
7357
7358 if (copy_to_user(optval, ¶ms, len))
7359 goto out;
7360
7361 retval = 0;
7362
7363out:
7364 return retval;
7365}
7366
7367static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7368 char __user *optval,
7369 int __user *optlen)
7370{
7371 struct sctp_default_prinfo info;
7372 struct sctp_association *asoc;
7373 int retval = -EFAULT;
7374
7375 if (len < sizeof(info)) {
7376 retval = -EINVAL;
7377 goto out;
7378 }
7379
7380 len = sizeof(info);
7381 if (copy_from_user(&info, optval, len))
7382 goto out;
7383
7384 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7385 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7386 sctp_style(sk, UDP)) {
7387 retval = -EINVAL;
7388 goto out;
7389 }
7390
7391 if (asoc) {
7392 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7393 info.pr_value = asoc->default_timetolive;
7394 } else {
7395 struct sctp_sock *sp = sctp_sk(sk);
7396
7397 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7398 info.pr_value = sp->default_timetolive;
7399 }
7400
7401 if (put_user(len, optlen))
7402 goto out;
7403
7404 if (copy_to_user(optval, &info, len))
7405 goto out;
7406
7407 retval = 0;
7408
7409out:
7410 return retval;
7411}
7412
7413static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7414 char __user *optval,
7415 int __user *optlen)
7416{
7417 struct sctp_prstatus params;
7418 struct sctp_association *asoc;
7419 int policy;
7420 int retval = -EINVAL;
7421
7422 if (len < sizeof(params))
7423 goto out;
7424
7425 len = sizeof(params);
7426 if (copy_from_user(¶ms, optval, len)) {
7427 retval = -EFAULT;
7428 goto out;
7429 }
7430
7431 policy = params.sprstat_policy;
7432 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7433 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7434 goto out;
7435
7436 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7437 if (!asoc)
7438 goto out;
7439
7440 if (policy == SCTP_PR_SCTP_ALL) {
7441 params.sprstat_abandoned_unsent = 0;
7442 params.sprstat_abandoned_sent = 0;
7443 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7444 params.sprstat_abandoned_unsent +=
7445 asoc->abandoned_unsent[policy];
7446 params.sprstat_abandoned_sent +=
7447 asoc->abandoned_sent[policy];
7448 }
7449 } else {
7450 params.sprstat_abandoned_unsent =
7451 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7452 params.sprstat_abandoned_sent =
7453 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7454 }
7455
7456 if (put_user(len, optlen)) {
7457 retval = -EFAULT;
7458 goto out;
7459 }
7460
7461 if (copy_to_user(optval, ¶ms, len)) {
7462 retval = -EFAULT;
7463 goto out;
7464 }
7465
7466 retval = 0;
7467
7468out:
7469 return retval;
7470}
7471
7472static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7473 char __user *optval,
7474 int __user *optlen)
7475{
7476 struct sctp_stream_out_ext *streamoute;
7477 struct sctp_association *asoc;
7478 struct sctp_prstatus params;
7479 int retval = -EINVAL;
7480 int policy;
7481
7482 if (len < sizeof(params))
7483 goto out;
7484
7485 len = sizeof(params);
7486 if (copy_from_user(¶ms, optval, len)) {
7487 retval = -EFAULT;
7488 goto out;
7489 }
7490
7491 policy = params.sprstat_policy;
7492 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7493 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7494 goto out;
7495
7496 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7497 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7498 goto out;
7499
7500 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7501 if (!streamoute) {
7502 /* Not allocated yet, means all stats are 0 */
7503 params.sprstat_abandoned_unsent = 0;
7504 params.sprstat_abandoned_sent = 0;
7505 retval = 0;
7506 goto out;
7507 }
7508
7509 if (policy == SCTP_PR_SCTP_ALL) {
7510 params.sprstat_abandoned_unsent = 0;
7511 params.sprstat_abandoned_sent = 0;
7512 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7513 params.sprstat_abandoned_unsent +=
7514 streamoute->abandoned_unsent[policy];
7515 params.sprstat_abandoned_sent +=
7516 streamoute->abandoned_sent[policy];
7517 }
7518 } else {
7519 params.sprstat_abandoned_unsent =
7520 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7521 params.sprstat_abandoned_sent =
7522 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7523 }
7524
7525 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7526 retval = -EFAULT;
7527 goto out;
7528 }
7529
7530 retval = 0;
7531
7532out:
7533 return retval;
7534}
7535
7536static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7537 char __user *optval,
7538 int __user *optlen)
7539{
7540 struct sctp_assoc_value params;
7541 struct sctp_association *asoc;
7542 int retval = -EFAULT;
7543
7544 if (len < sizeof(params)) {
7545 retval = -EINVAL;
7546 goto out;
7547 }
7548
7549 len = sizeof(params);
7550 if (copy_from_user(¶ms, optval, len))
7551 goto out;
7552
7553 asoc = sctp_id2assoc(sk, params.assoc_id);
7554 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7555 sctp_style(sk, UDP)) {
7556 retval = -EINVAL;
7557 goto out;
7558 }
7559
7560 params.assoc_value = asoc ? asoc->peer.reconf_capable
7561 : sctp_sk(sk)->ep->reconf_enable;
7562
7563 if (put_user(len, optlen))
7564 goto out;
7565
7566 if (copy_to_user(optval, ¶ms, len))
7567 goto out;
7568
7569 retval = 0;
7570
7571out:
7572 return retval;
7573}
7574
7575static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7576 char __user *optval,
7577 int __user *optlen)
7578{
7579 struct sctp_assoc_value params;
7580 struct sctp_association *asoc;
7581 int retval = -EFAULT;
7582
7583 if (len < sizeof(params)) {
7584 retval = -EINVAL;
7585 goto out;
7586 }
7587
7588 len = sizeof(params);
7589 if (copy_from_user(¶ms, optval, len))
7590 goto out;
7591
7592 asoc = sctp_id2assoc(sk, params.assoc_id);
7593 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7594 sctp_style(sk, UDP)) {
7595 retval = -EINVAL;
7596 goto out;
7597 }
7598
7599 params.assoc_value = asoc ? asoc->strreset_enable
7600 : sctp_sk(sk)->ep->strreset_enable;
7601
7602 if (put_user(len, optlen))
7603 goto out;
7604
7605 if (copy_to_user(optval, ¶ms, len))
7606 goto out;
7607
7608 retval = 0;
7609
7610out:
7611 return retval;
7612}
7613
7614static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7615 char __user *optval,
7616 int __user *optlen)
7617{
7618 struct sctp_assoc_value params;
7619 struct sctp_association *asoc;
7620 int retval = -EFAULT;
7621
7622 if (len < sizeof(params)) {
7623 retval = -EINVAL;
7624 goto out;
7625 }
7626
7627 len = sizeof(params);
7628 if (copy_from_user(¶ms, optval, len))
7629 goto out;
7630
7631 asoc = sctp_id2assoc(sk, params.assoc_id);
7632 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7633 sctp_style(sk, UDP)) {
7634 retval = -EINVAL;
7635 goto out;
7636 }
7637
7638 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7639 : sctp_sk(sk)->default_ss;
7640
7641 if (put_user(len, optlen))
7642 goto out;
7643
7644 if (copy_to_user(optval, ¶ms, len))
7645 goto out;
7646
7647 retval = 0;
7648
7649out:
7650 return retval;
7651}
7652
7653static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7654 char __user *optval,
7655 int __user *optlen)
7656{
7657 struct sctp_stream_value params;
7658 struct sctp_association *asoc;
7659 int retval = -EFAULT;
7660
7661 if (len < sizeof(params)) {
7662 retval = -EINVAL;
7663 goto out;
7664 }
7665
7666 len = sizeof(params);
7667 if (copy_from_user(¶ms, optval, len))
7668 goto out;
7669
7670 asoc = sctp_id2assoc(sk, params.assoc_id);
7671 if (!asoc) {
7672 retval = -EINVAL;
7673 goto out;
7674 }
7675
7676 retval = sctp_sched_get_value(asoc, params.stream_id,
7677 ¶ms.stream_value);
7678 if (retval)
7679 goto out;
7680
7681 if (put_user(len, optlen)) {
7682 retval = -EFAULT;
7683 goto out;
7684 }
7685
7686 if (copy_to_user(optval, ¶ms, len)) {
7687 retval = -EFAULT;
7688 goto out;
7689 }
7690
7691out:
7692 return retval;
7693}
7694
7695static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7696 char __user *optval,
7697 int __user *optlen)
7698{
7699 struct sctp_assoc_value params;
7700 struct sctp_association *asoc;
7701 int retval = -EFAULT;
7702
7703 if (len < sizeof(params)) {
7704 retval = -EINVAL;
7705 goto out;
7706 }
7707
7708 len = sizeof(params);
7709 if (copy_from_user(¶ms, optval, len))
7710 goto out;
7711
7712 asoc = sctp_id2assoc(sk, params.assoc_id);
7713 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7714 sctp_style(sk, UDP)) {
7715 retval = -EINVAL;
7716 goto out;
7717 }
7718
7719 params.assoc_value = asoc ? asoc->peer.intl_capable
7720 : sctp_sk(sk)->ep->intl_enable;
7721
7722 if (put_user(len, optlen))
7723 goto out;
7724
7725 if (copy_to_user(optval, ¶ms, len))
7726 goto out;
7727
7728 retval = 0;
7729
7730out:
7731 return retval;
7732}
7733
7734static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7735 char __user *optval,
7736 int __user *optlen)
7737{
7738 int val;
7739
7740 if (len < sizeof(int))
7741 return -EINVAL;
7742
7743 len = sizeof(int);
7744 val = sctp_sk(sk)->reuse;
7745 if (put_user(len, optlen))
7746 return -EFAULT;
7747
7748 if (copy_to_user(optval, &val, len))
7749 return -EFAULT;
7750
7751 return 0;
7752}
7753
7754static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7755 int __user *optlen)
7756{
7757 struct sctp_association *asoc;
7758 struct sctp_event param;
7759 __u16 subscribe;
7760
7761 if (len < sizeof(param))
7762 return -EINVAL;
7763
7764 len = sizeof(param);
7765 if (copy_from_user(¶m, optval, len))
7766 return -EFAULT;
7767
7768 if (param.se_type < SCTP_SN_TYPE_BASE ||
7769 param.se_type > SCTP_SN_TYPE_MAX)
7770 return -EINVAL;
7771
7772 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7773 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7774 sctp_style(sk, UDP))
7775 return -EINVAL;
7776
7777 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7778 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7779
7780 if (put_user(len, optlen))
7781 return -EFAULT;
7782
7783 if (copy_to_user(optval, ¶m, len))
7784 return -EFAULT;
7785
7786 return 0;
7787}
7788
7789static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7790 char __user *optval,
7791 int __user *optlen)
7792{
7793 struct sctp_assoc_value params;
7794 struct sctp_association *asoc;
7795 int retval = -EFAULT;
7796
7797 if (len < sizeof(params)) {
7798 retval = -EINVAL;
7799 goto out;
7800 }
7801
7802 len = sizeof(params);
7803 if (copy_from_user(¶ms, optval, len))
7804 goto out;
7805
7806 asoc = sctp_id2assoc(sk, params.assoc_id);
7807 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7808 sctp_style(sk, UDP)) {
7809 retval = -EINVAL;
7810 goto out;
7811 }
7812
7813 params.assoc_value = asoc ? asoc->peer.asconf_capable
7814 : sctp_sk(sk)->ep->asconf_enable;
7815
7816 if (put_user(len, optlen))
7817 goto out;
7818
7819 if (copy_to_user(optval, ¶ms, len))
7820 goto out;
7821
7822 retval = 0;
7823
7824out:
7825 return retval;
7826}
7827
7828static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7829 char __user *optval,
7830 int __user *optlen)
7831{
7832 struct sctp_assoc_value params;
7833 struct sctp_association *asoc;
7834 int retval = -EFAULT;
7835
7836 if (len < sizeof(params)) {
7837 retval = -EINVAL;
7838 goto out;
7839 }
7840
7841 len = sizeof(params);
7842 if (copy_from_user(¶ms, optval, len))
7843 goto out;
7844
7845 asoc = sctp_id2assoc(sk, params.assoc_id);
7846 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7847 sctp_style(sk, UDP)) {
7848 retval = -EINVAL;
7849 goto out;
7850 }
7851
7852 params.assoc_value = asoc ? asoc->peer.auth_capable
7853 : sctp_sk(sk)->ep->auth_enable;
7854
7855 if (put_user(len, optlen))
7856 goto out;
7857
7858 if (copy_to_user(optval, ¶ms, len))
7859 goto out;
7860
7861 retval = 0;
7862
7863out:
7864 return retval;
7865}
7866
7867static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7868 char __user *optval,
7869 int __user *optlen)
7870{
7871 struct sctp_assoc_value params;
7872 struct sctp_association *asoc;
7873 int retval = -EFAULT;
7874
7875 if (len < sizeof(params)) {
7876 retval = -EINVAL;
7877 goto out;
7878 }
7879
7880 len = sizeof(params);
7881 if (copy_from_user(¶ms, optval, len))
7882 goto out;
7883
7884 asoc = sctp_id2assoc(sk, params.assoc_id);
7885 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7886 sctp_style(sk, UDP)) {
7887 retval = -EINVAL;
7888 goto out;
7889 }
7890
7891 params.assoc_value = asoc ? asoc->peer.ecn_capable
7892 : sctp_sk(sk)->ep->ecn_enable;
7893
7894 if (put_user(len, optlen))
7895 goto out;
7896
7897 if (copy_to_user(optval, ¶ms, len))
7898 goto out;
7899
7900 retval = 0;
7901
7902out:
7903 return retval;
7904}
7905
7906static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7907 char __user *optval,
7908 int __user *optlen)
7909{
7910 struct sctp_assoc_value params;
7911 struct sctp_association *asoc;
7912 int retval = -EFAULT;
7913
7914 if (len < sizeof(params)) {
7915 retval = -EINVAL;
7916 goto out;
7917 }
7918
7919 len = sizeof(params);
7920 if (copy_from_user(¶ms, optval, len))
7921 goto out;
7922
7923 asoc = sctp_id2assoc(sk, params.assoc_id);
7924 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7925 sctp_style(sk, UDP)) {
7926 retval = -EINVAL;
7927 goto out;
7928 }
7929
7930 params.assoc_value = asoc ? asoc->pf_expose
7931 : sctp_sk(sk)->pf_expose;
7932
7933 if (put_user(len, optlen))
7934 goto out;
7935
7936 if (copy_to_user(optval, ¶ms, len))
7937 goto out;
7938
7939 retval = 0;
7940
7941out:
7942 return retval;
7943}
7944
7945static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7946 char __user *optval, int __user *optlen)
7947{
7948 struct sctp_association *asoc;
7949 struct sctp_udpencaps encap;
7950 struct sctp_transport *t;
7951 __be16 encap_port;
7952
7953 if (len < sizeof(encap))
7954 return -EINVAL;
7955
7956 len = sizeof(encap);
7957 if (copy_from_user(&encap, optval, len))
7958 return -EFAULT;
7959
7960 /* If an address other than INADDR_ANY is specified, and
7961 * no transport is found, then the request is invalid.
7962 */
7963 if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7964 t = sctp_addr_id2transport(sk, &encap.sue_address,
7965 encap.sue_assoc_id);
7966 if (!t) {
7967 pr_debug("%s: failed no transport\n", __func__);
7968 return -EINVAL;
7969 }
7970
7971 encap_port = t->encap_port;
7972 goto out;
7973 }
7974
7975 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7976 * socket is a one to many style socket, and an association
7977 * was not found, then the id was invalid.
7978 */
7979 asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7980 if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7981 sctp_style(sk, UDP)) {
7982 pr_debug("%s: failed no association\n", __func__);
7983 return -EINVAL;
7984 }
7985
7986 if (asoc) {
7987 encap_port = asoc->encap_port;
7988 goto out;
7989 }
7990
7991 encap_port = sctp_sk(sk)->encap_port;
7992
7993out:
7994 encap.sue_port = (__force uint16_t)encap_port;
7995 if (copy_to_user(optval, &encap, len))
7996 return -EFAULT;
7997
7998 if (put_user(len, optlen))
7999 return -EFAULT;
8000
8001 return 0;
8002}
8003
8004static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
8005 char __user *optval,
8006 int __user *optlen)
8007{
8008 struct sctp_probeinterval params;
8009 struct sctp_association *asoc;
8010 struct sctp_transport *t;
8011 __u32 probe_interval;
8012
8013 if (len < sizeof(params))
8014 return -EINVAL;
8015
8016 len = sizeof(params);
8017 if (copy_from_user(¶ms, optval, len))
8018 return -EFAULT;
8019
8020 /* If an address other than INADDR_ANY is specified, and
8021 * no transport is found, then the request is invalid.
8022 */
8023 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spi_address)) {
8024 t = sctp_addr_id2transport(sk, ¶ms.spi_address,
8025 params.spi_assoc_id);
8026 if (!t) {
8027 pr_debug("%s: failed no transport\n", __func__);
8028 return -EINVAL;
8029 }
8030
8031 probe_interval = jiffies_to_msecs(t->probe_interval);
8032 goto out;
8033 }
8034
8035 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8036 * socket is a one to many style socket, and an association
8037 * was not found, then the id was invalid.
8038 */
8039 asoc = sctp_id2assoc(sk, params.spi_assoc_id);
8040 if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8041 sctp_style(sk, UDP)) {
8042 pr_debug("%s: failed no association\n", __func__);
8043 return -EINVAL;
8044 }
8045
8046 if (asoc) {
8047 probe_interval = jiffies_to_msecs(asoc->probe_interval);
8048 goto out;
8049 }
8050
8051 probe_interval = sctp_sk(sk)->probe_interval;
8052
8053out:
8054 params.spi_interval = probe_interval;
8055 if (copy_to_user(optval, ¶ms, len))
8056 return -EFAULT;
8057
8058 if (put_user(len, optlen))
8059 return -EFAULT;
8060
8061 return 0;
8062}
8063
8064static int sctp_getsockopt(struct sock *sk, int level, int optname,
8065 char __user *optval, int __user *optlen)
8066{
8067 int retval = 0;
8068 int len;
8069
8070 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8071
8072 /* I can hardly begin to describe how wrong this is. This is
8073 * so broken as to be worse than useless. The API draft
8074 * REALLY is NOT helpful here... I am not convinced that the
8075 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8076 * are at all well-founded.
8077 */
8078 if (level != SOL_SCTP) {
8079 struct sctp_af *af = sctp_sk(sk)->pf->af;
8080
8081 retval = af->getsockopt(sk, level, optname, optval, optlen);
8082 return retval;
8083 }
8084
8085 if (get_user(len, optlen))
8086 return -EFAULT;
8087
8088 if (len < 0)
8089 return -EINVAL;
8090
8091 lock_sock(sk);
8092
8093 switch (optname) {
8094 case SCTP_STATUS:
8095 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8096 break;
8097 case SCTP_DISABLE_FRAGMENTS:
8098 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8099 optlen);
8100 break;
8101 case SCTP_EVENTS:
8102 retval = sctp_getsockopt_events(sk, len, optval, optlen);
8103 break;
8104 case SCTP_AUTOCLOSE:
8105 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8106 break;
8107 case SCTP_SOCKOPT_PEELOFF:
8108 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8109 break;
8110 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8111 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8112 break;
8113 case SCTP_PEER_ADDR_PARAMS:
8114 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8115 optlen);
8116 break;
8117 case SCTP_DELAYED_SACK:
8118 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8119 optlen);
8120 break;
8121 case SCTP_INITMSG:
8122 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8123 break;
8124 case SCTP_GET_PEER_ADDRS:
8125 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8126 optlen);
8127 break;
8128 case SCTP_GET_LOCAL_ADDRS:
8129 retval = sctp_getsockopt_local_addrs(sk, len, optval,
8130 optlen);
8131 break;
8132 case SCTP_SOCKOPT_CONNECTX3:
8133 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8134 break;
8135 case SCTP_DEFAULT_SEND_PARAM:
8136 retval = sctp_getsockopt_default_send_param(sk, len,
8137 optval, optlen);
8138 break;
8139 case SCTP_DEFAULT_SNDINFO:
8140 retval = sctp_getsockopt_default_sndinfo(sk, len,
8141 optval, optlen);
8142 break;
8143 case SCTP_PRIMARY_ADDR:
8144 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8145 break;
8146 case SCTP_NODELAY:
8147 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8148 break;
8149 case SCTP_RTOINFO:
8150 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8151 break;
8152 case SCTP_ASSOCINFO:
8153 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8154 break;
8155 case SCTP_I_WANT_MAPPED_V4_ADDR:
8156 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8157 break;
8158 case SCTP_MAXSEG:
8159 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8160 break;
8161 case SCTP_GET_PEER_ADDR_INFO:
8162 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8163 optlen);
8164 break;
8165 case SCTP_ADAPTATION_LAYER:
8166 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8167 optlen);
8168 break;
8169 case SCTP_CONTEXT:
8170 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8171 break;
8172 case SCTP_FRAGMENT_INTERLEAVE:
8173 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8174 optlen);
8175 break;
8176 case SCTP_PARTIAL_DELIVERY_POINT:
8177 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8178 optlen);
8179 break;
8180 case SCTP_MAX_BURST:
8181 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8182 break;
8183 case SCTP_AUTH_KEY:
8184 case SCTP_AUTH_CHUNK:
8185 case SCTP_AUTH_DELETE_KEY:
8186 case SCTP_AUTH_DEACTIVATE_KEY:
8187 retval = -EOPNOTSUPP;
8188 break;
8189 case SCTP_HMAC_IDENT:
8190 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8191 break;
8192 case SCTP_AUTH_ACTIVE_KEY:
8193 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8194 break;
8195 case SCTP_PEER_AUTH_CHUNKS:
8196 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8197 optlen);
8198 break;
8199 case SCTP_LOCAL_AUTH_CHUNKS:
8200 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8201 optlen);
8202 break;
8203 case SCTP_GET_ASSOC_NUMBER:
8204 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8205 break;
8206 case SCTP_GET_ASSOC_ID_LIST:
8207 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8208 break;
8209 case SCTP_AUTO_ASCONF:
8210 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8211 break;
8212 case SCTP_PEER_ADDR_THLDS:
8213 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8214 optlen, false);
8215 break;
8216 case SCTP_PEER_ADDR_THLDS_V2:
8217 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8218 optlen, true);
8219 break;
8220 case SCTP_GET_ASSOC_STATS:
8221 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8222 break;
8223 case SCTP_RECVRCVINFO:
8224 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8225 break;
8226 case SCTP_RECVNXTINFO:
8227 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8228 break;
8229 case SCTP_PR_SUPPORTED:
8230 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8231 break;
8232 case SCTP_DEFAULT_PRINFO:
8233 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8234 optlen);
8235 break;
8236 case SCTP_PR_ASSOC_STATUS:
8237 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8238 optlen);
8239 break;
8240 case SCTP_PR_STREAM_STATUS:
8241 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8242 optlen);
8243 break;
8244 case SCTP_RECONFIG_SUPPORTED:
8245 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8246 optlen);
8247 break;
8248 case SCTP_ENABLE_STREAM_RESET:
8249 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8250 optlen);
8251 break;
8252 case SCTP_STREAM_SCHEDULER:
8253 retval = sctp_getsockopt_scheduler(sk, len, optval,
8254 optlen);
8255 break;
8256 case SCTP_STREAM_SCHEDULER_VALUE:
8257 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8258 optlen);
8259 break;
8260 case SCTP_INTERLEAVING_SUPPORTED:
8261 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8262 optlen);
8263 break;
8264 case SCTP_REUSE_PORT:
8265 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8266 break;
8267 case SCTP_EVENT:
8268 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8269 break;
8270 case SCTP_ASCONF_SUPPORTED:
8271 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8272 optlen);
8273 break;
8274 case SCTP_AUTH_SUPPORTED:
8275 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8276 optlen);
8277 break;
8278 case SCTP_ECN_SUPPORTED:
8279 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8280 break;
8281 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8282 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8283 break;
8284 case SCTP_REMOTE_UDP_ENCAPS_PORT:
8285 retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8286 break;
8287 case SCTP_PLPMTUD_PROBE_INTERVAL:
8288 retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8289 break;
8290 default:
8291 retval = -ENOPROTOOPT;
8292 break;
8293 }
8294
8295 release_sock(sk);
8296 return retval;
8297}
8298
8299static bool sctp_bpf_bypass_getsockopt(int level, int optname)
8300{
8301 if (level == SOL_SCTP) {
8302 switch (optname) {
8303 case SCTP_SOCKOPT_PEELOFF:
8304 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8305 case SCTP_SOCKOPT_CONNECTX3:
8306 return true;
8307 default:
8308 return false;
8309 }
8310 }
8311
8312 return false;
8313}
8314
8315static int sctp_hash(struct sock *sk)
8316{
8317 /* STUB */
8318 return 0;
8319}
8320
8321static void sctp_unhash(struct sock *sk)
8322{
8323 /* STUB */
8324}
8325
8326/* Check if port is acceptable. Possibly find first available port.
8327 *
8328 * The port hash table (contained in the 'global' SCTP protocol storage
8329 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8330 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8331 * list (the list number is the port number hashed out, so as you
8332 * would expect from a hash function, all the ports in a given list have
8333 * such a number that hashes out to the same list number; you were
8334 * expecting that, right?); so each list has a set of ports, with a
8335 * link to the socket (struct sock) that uses it, the port number and
8336 * a fastreuse flag (FIXME: NPI ipg).
8337 */
8338static struct sctp_bind_bucket *sctp_bucket_create(
8339 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8340
8341static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8342{
8343 struct sctp_sock *sp = sctp_sk(sk);
8344 bool reuse = (sk->sk_reuse || sp->reuse);
8345 struct sctp_bind_hashbucket *head; /* hash list */
8346 struct net *net = sock_net(sk);
8347 kuid_t uid = sock_i_uid(sk);
8348 struct sctp_bind_bucket *pp;
8349 unsigned short snum;
8350 int ret;
8351
8352 snum = ntohs(addr->v4.sin_port);
8353
8354 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8355
8356 if (snum == 0) {
8357 /* Search for an available port. */
8358 int low, high, remaining, index;
8359 unsigned int rover;
8360
8361 inet_sk_get_local_port_range(sk, &low, &high);
8362 remaining = (high - low) + 1;
8363 rover = get_random_u32_below(remaining) + low;
8364
8365 do {
8366 rover++;
8367 if ((rover < low) || (rover > high))
8368 rover = low;
8369 if (inet_is_local_reserved_port(net, rover))
8370 continue;
8371 index = sctp_phashfn(net, rover);
8372 head = &sctp_port_hashtable[index];
8373 spin_lock_bh(&head->lock);
8374 sctp_for_each_hentry(pp, &head->chain)
8375 if ((pp->port == rover) &&
8376 net_eq(net, pp->net))
8377 goto next;
8378 break;
8379 next:
8380 spin_unlock_bh(&head->lock);
8381 cond_resched();
8382 } while (--remaining > 0);
8383
8384 /* Exhausted local port range during search? */
8385 ret = 1;
8386 if (remaining <= 0)
8387 return ret;
8388
8389 /* OK, here is the one we will use. HEAD (the port
8390 * hash table list entry) is non-NULL and we hold it's
8391 * mutex.
8392 */
8393 snum = rover;
8394 } else {
8395 /* We are given an specific port number; we verify
8396 * that it is not being used. If it is used, we will
8397 * exahust the search in the hash list corresponding
8398 * to the port number (snum) - we detect that with the
8399 * port iterator, pp being NULL.
8400 */
8401 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8402 spin_lock_bh(&head->lock);
8403 sctp_for_each_hentry(pp, &head->chain) {
8404 if ((pp->port == snum) && net_eq(pp->net, net))
8405 goto pp_found;
8406 }
8407 }
8408 pp = NULL;
8409 goto pp_not_found;
8410pp_found:
8411 if (!hlist_empty(&pp->owner)) {
8412 /* We had a port hash table hit - there is an
8413 * available port (pp != NULL) and it is being
8414 * used by other socket (pp->owner not empty); that other
8415 * socket is going to be sk2.
8416 */
8417 struct sock *sk2;
8418
8419 pr_debug("%s: found a possible match\n", __func__);
8420
8421 if ((pp->fastreuse && reuse &&
8422 sk->sk_state != SCTP_SS_LISTENING) ||
8423 (pp->fastreuseport && sk->sk_reuseport &&
8424 uid_eq(pp->fastuid, uid)))
8425 goto success;
8426
8427 /* Run through the list of sockets bound to the port
8428 * (pp->port) [via the pointers bind_next and
8429 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8430 * we get the endpoint they describe and run through
8431 * the endpoint's list of IP (v4 or v6) addresses,
8432 * comparing each of the addresses with the address of
8433 * the socket sk. If we find a match, then that means
8434 * that this port/socket (sk) combination are already
8435 * in an endpoint.
8436 */
8437 sk_for_each_bound(sk2, &pp->owner) {
8438 int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
8439 struct sctp_sock *sp2 = sctp_sk(sk2);
8440 struct sctp_endpoint *ep2 = sp2->ep;
8441
8442 if (sk == sk2 ||
8443 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8444 sk2->sk_state != SCTP_SS_LISTENING) ||
8445 (sk->sk_reuseport && sk2->sk_reuseport &&
8446 uid_eq(uid, sock_i_uid(sk2))))
8447 continue;
8448
8449 if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
8450 sk->sk_bound_dev_if == bound_dev_if2) &&
8451 sctp_bind_addr_conflict(&ep2->base.bind_addr,
8452 addr, sp2, sp)) {
8453 ret = 1;
8454 goto fail_unlock;
8455 }
8456 }
8457
8458 pr_debug("%s: found a match\n", __func__);
8459 }
8460pp_not_found:
8461 /* If there was a hash table miss, create a new port. */
8462 ret = 1;
8463 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8464 goto fail_unlock;
8465
8466 /* In either case (hit or miss), make sure fastreuse is 1 only
8467 * if sk->sk_reuse is too (that is, if the caller requested
8468 * SO_REUSEADDR on this socket -sk-).
8469 */
8470 if (hlist_empty(&pp->owner)) {
8471 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8472 pp->fastreuse = 1;
8473 else
8474 pp->fastreuse = 0;
8475
8476 if (sk->sk_reuseport) {
8477 pp->fastreuseport = 1;
8478 pp->fastuid = uid;
8479 } else {
8480 pp->fastreuseport = 0;
8481 }
8482 } else {
8483 if (pp->fastreuse &&
8484 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8485 pp->fastreuse = 0;
8486
8487 if (pp->fastreuseport &&
8488 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8489 pp->fastreuseport = 0;
8490 }
8491
8492 /* We are set, so fill up all the data in the hash table
8493 * entry, tie the socket list information with the rest of the
8494 * sockets FIXME: Blurry, NPI (ipg).
8495 */
8496success:
8497 if (!sp->bind_hash) {
8498 inet_sk(sk)->inet_num = snum;
8499 sk_add_bind_node(sk, &pp->owner);
8500 sp->bind_hash = pp;
8501 }
8502 ret = 0;
8503
8504fail_unlock:
8505 spin_unlock_bh(&head->lock);
8506 return ret;
8507}
8508
8509/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8510 * port is requested.
8511 */
8512static int sctp_get_port(struct sock *sk, unsigned short snum)
8513{
8514 union sctp_addr addr;
8515 struct sctp_af *af = sctp_sk(sk)->pf->af;
8516
8517 /* Set up a dummy address struct from the sk. */
8518 af->from_sk(&addr, sk);
8519 addr.v4.sin_port = htons(snum);
8520
8521 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8522 return sctp_get_port_local(sk, &addr);
8523}
8524
8525/*
8526 * Move a socket to LISTENING state.
8527 */
8528static int sctp_listen_start(struct sock *sk, int backlog)
8529{
8530 struct sctp_sock *sp = sctp_sk(sk);
8531 struct sctp_endpoint *ep = sp->ep;
8532 struct crypto_shash *tfm = NULL;
8533 char alg[32];
8534 int err;
8535
8536 /* Allocate HMAC for generating cookie. */
8537 if (!sp->hmac && sp->sctp_hmac_alg) {
8538 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8539 tfm = crypto_alloc_shash(alg, 0, 0);
8540 if (IS_ERR(tfm)) {
8541 net_info_ratelimited("failed to load transform for %s: %ld\n",
8542 sp->sctp_hmac_alg, PTR_ERR(tfm));
8543 return -ENOSYS;
8544 }
8545 sctp_sk(sk)->hmac = tfm;
8546 }
8547
8548 /*
8549 * If a bind() or sctp_bindx() is not called prior to a listen()
8550 * call that allows new associations to be accepted, the system
8551 * picks an ephemeral port and will choose an address set equivalent
8552 * to binding with a wildcard address.
8553 *
8554 * This is not currently spelled out in the SCTP sockets
8555 * extensions draft, but follows the practice as seen in TCP
8556 * sockets.
8557 *
8558 */
8559 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8560 if (!ep->base.bind_addr.port) {
8561 if (sctp_autobind(sk)) {
8562 err = -EAGAIN;
8563 goto err;
8564 }
8565 } else {
8566 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8567 err = -EADDRINUSE;
8568 goto err;
8569 }
8570 }
8571
8572 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8573 err = sctp_hash_endpoint(ep);
8574 if (err)
8575 goto err;
8576
8577 return 0;
8578err:
8579 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8580 return err;
8581}
8582
8583/*
8584 * 4.1.3 / 5.1.3 listen()
8585 *
8586 * By default, new associations are not accepted for UDP style sockets.
8587 * An application uses listen() to mark a socket as being able to
8588 * accept new associations.
8589 *
8590 * On TCP style sockets, applications use listen() to ready the SCTP
8591 * endpoint for accepting inbound associations.
8592 *
8593 * On both types of endpoints a backlog of '0' disables listening.
8594 *
8595 * Move a socket to LISTENING state.
8596 */
8597int sctp_inet_listen(struct socket *sock, int backlog)
8598{
8599 struct sock *sk = sock->sk;
8600 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8601 int err = -EINVAL;
8602
8603 if (unlikely(backlog < 0))
8604 return err;
8605
8606 lock_sock(sk);
8607
8608 /* Peeled-off sockets are not allowed to listen(). */
8609 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8610 goto out;
8611
8612 if (sock->state != SS_UNCONNECTED)
8613 goto out;
8614
8615 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8616 goto out;
8617
8618 /* If backlog is zero, disable listening. */
8619 if (!backlog) {
8620 if (sctp_sstate(sk, CLOSED))
8621 goto out;
8622
8623 err = 0;
8624 sctp_unhash_endpoint(ep);
8625 sk->sk_state = SCTP_SS_CLOSED;
8626 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8627 sctp_sk(sk)->bind_hash->fastreuse = 1;
8628 goto out;
8629 }
8630
8631 /* If we are already listening, just update the backlog */
8632 if (sctp_sstate(sk, LISTENING))
8633 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8634 else {
8635 err = sctp_listen_start(sk, backlog);
8636 if (err)
8637 goto out;
8638 }
8639
8640 err = 0;
8641out:
8642 release_sock(sk);
8643 return err;
8644}
8645
8646/*
8647 * This function is done by modeling the current datagram_poll() and the
8648 * tcp_poll(). Note that, based on these implementations, we don't
8649 * lock the socket in this function, even though it seems that,
8650 * ideally, locking or some other mechanisms can be used to ensure
8651 * the integrity of the counters (sndbuf and wmem_alloc) used
8652 * in this place. We assume that we don't need locks either until proven
8653 * otherwise.
8654 *
8655 * Another thing to note is that we include the Async I/O support
8656 * here, again, by modeling the current TCP/UDP code. We don't have
8657 * a good way to test with it yet.
8658 */
8659__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8660{
8661 struct sock *sk = sock->sk;
8662 struct sctp_sock *sp = sctp_sk(sk);
8663 __poll_t mask;
8664
8665 poll_wait(file, sk_sleep(sk), wait);
8666
8667 sock_rps_record_flow(sk);
8668
8669 /* A TCP-style listening socket becomes readable when the accept queue
8670 * is not empty.
8671 */
8672 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8673 return (!list_empty(&sp->ep->asocs)) ?
8674 (EPOLLIN | EPOLLRDNORM) : 0;
8675
8676 mask = 0;
8677
8678 /* Is there any exceptional events? */
8679 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8680 mask |= EPOLLERR |
8681 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8682 if (sk->sk_shutdown & RCV_SHUTDOWN)
8683 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8684 if (sk->sk_shutdown == SHUTDOWN_MASK)
8685 mask |= EPOLLHUP;
8686
8687 /* Is it readable? Reconsider this code with TCP-style support. */
8688 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8689 mask |= EPOLLIN | EPOLLRDNORM;
8690
8691 /* The association is either gone or not ready. */
8692 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8693 return mask;
8694
8695 /* Is it writable? */
8696 if (sctp_writeable(sk)) {
8697 mask |= EPOLLOUT | EPOLLWRNORM;
8698 } else {
8699 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8700 /*
8701 * Since the socket is not locked, the buffer
8702 * might be made available after the writeable check and
8703 * before the bit is set. This could cause a lost I/O
8704 * signal. tcp_poll() has a race breaker for this race
8705 * condition. Based on their implementation, we put
8706 * in the following code to cover it as well.
8707 */
8708 if (sctp_writeable(sk))
8709 mask |= EPOLLOUT | EPOLLWRNORM;
8710 }
8711 return mask;
8712}
8713
8714/********************************************************************
8715 * 2nd Level Abstractions
8716 ********************************************************************/
8717
8718static struct sctp_bind_bucket *sctp_bucket_create(
8719 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8720{
8721 struct sctp_bind_bucket *pp;
8722
8723 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8724 if (pp) {
8725 SCTP_DBG_OBJCNT_INC(bind_bucket);
8726 pp->port = snum;
8727 pp->fastreuse = 0;
8728 INIT_HLIST_HEAD(&pp->owner);
8729 pp->net = net;
8730 hlist_add_head(&pp->node, &head->chain);
8731 }
8732 return pp;
8733}
8734
8735/* Caller must hold hashbucket lock for this tb with local BH disabled */
8736static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8737{
8738 if (pp && hlist_empty(&pp->owner)) {
8739 __hlist_del(&pp->node);
8740 kmem_cache_free(sctp_bucket_cachep, pp);
8741 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8742 }
8743}
8744
8745/* Release this socket's reference to a local port. */
8746static inline void __sctp_put_port(struct sock *sk)
8747{
8748 struct sctp_bind_hashbucket *head =
8749 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8750 inet_sk(sk)->inet_num)];
8751 struct sctp_bind_bucket *pp;
8752
8753 spin_lock(&head->lock);
8754 pp = sctp_sk(sk)->bind_hash;
8755 __sk_del_bind_node(sk);
8756 sctp_sk(sk)->bind_hash = NULL;
8757 inet_sk(sk)->inet_num = 0;
8758 sctp_bucket_destroy(pp);
8759 spin_unlock(&head->lock);
8760}
8761
8762void sctp_put_port(struct sock *sk)
8763{
8764 local_bh_disable();
8765 __sctp_put_port(sk);
8766 local_bh_enable();
8767}
8768
8769/*
8770 * The system picks an ephemeral port and choose an address set equivalent
8771 * to binding with a wildcard address.
8772 * One of those addresses will be the primary address for the association.
8773 * This automatically enables the multihoming capability of SCTP.
8774 */
8775static int sctp_autobind(struct sock *sk)
8776{
8777 union sctp_addr autoaddr;
8778 struct sctp_af *af;
8779 __be16 port;
8780
8781 /* Initialize a local sockaddr structure to INADDR_ANY. */
8782 af = sctp_sk(sk)->pf->af;
8783
8784 port = htons(inet_sk(sk)->inet_num);
8785 af->inaddr_any(&autoaddr, port);
8786
8787 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8788}
8789
8790/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8791 *
8792 * From RFC 2292
8793 * 4.2 The cmsghdr Structure *
8794 *
8795 * When ancillary data is sent or received, any number of ancillary data
8796 * objects can be specified by the msg_control and msg_controllen members of
8797 * the msghdr structure, because each object is preceded by
8798 * a cmsghdr structure defining the object's length (the cmsg_len member).
8799 * Historically Berkeley-derived implementations have passed only one object
8800 * at a time, but this API allows multiple objects to be
8801 * passed in a single call to sendmsg() or recvmsg(). The following example
8802 * shows two ancillary data objects in a control buffer.
8803 *
8804 * |<--------------------------- msg_controllen -------------------------->|
8805 * | |
8806 *
8807 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8808 *
8809 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8810 * | | |
8811 *
8812 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8813 *
8814 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8815 * | | | | |
8816 *
8817 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8818 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8819 *
8820 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8821 *
8822 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8823 * ^
8824 * |
8825 *
8826 * msg_control
8827 * points here
8828 */
8829static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8830{
8831 struct msghdr *my_msg = (struct msghdr *)msg;
8832 struct cmsghdr *cmsg;
8833
8834 for_each_cmsghdr(cmsg, my_msg) {
8835 if (!CMSG_OK(my_msg, cmsg))
8836 return -EINVAL;
8837
8838 /* Should we parse this header or ignore? */
8839 if (cmsg->cmsg_level != IPPROTO_SCTP)
8840 continue;
8841
8842 /* Strictly check lengths following example in SCM code. */
8843 switch (cmsg->cmsg_type) {
8844 case SCTP_INIT:
8845 /* SCTP Socket API Extension
8846 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8847 *
8848 * This cmsghdr structure provides information for
8849 * initializing new SCTP associations with sendmsg().
8850 * The SCTP_INITMSG socket option uses this same data
8851 * structure. This structure is not used for
8852 * recvmsg().
8853 *
8854 * cmsg_level cmsg_type cmsg_data[]
8855 * ------------ ------------ ----------------------
8856 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8857 */
8858 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8859 return -EINVAL;
8860
8861 cmsgs->init = CMSG_DATA(cmsg);
8862 break;
8863
8864 case SCTP_SNDRCV:
8865 /* SCTP Socket API Extension
8866 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8867 *
8868 * This cmsghdr structure specifies SCTP options for
8869 * sendmsg() and describes SCTP header information
8870 * about a received message through recvmsg().
8871 *
8872 * cmsg_level cmsg_type cmsg_data[]
8873 * ------------ ------------ ----------------------
8874 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8875 */
8876 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8877 return -EINVAL;
8878
8879 cmsgs->srinfo = CMSG_DATA(cmsg);
8880
8881 if (cmsgs->srinfo->sinfo_flags &
8882 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8883 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8884 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8885 return -EINVAL;
8886 break;
8887
8888 case SCTP_SNDINFO:
8889 /* SCTP Socket API Extension
8890 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8891 *
8892 * This cmsghdr structure specifies SCTP options for
8893 * sendmsg(). This structure and SCTP_RCVINFO replaces
8894 * SCTP_SNDRCV which has been deprecated.
8895 *
8896 * cmsg_level cmsg_type cmsg_data[]
8897 * ------------ ------------ ---------------------
8898 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8899 */
8900 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8901 return -EINVAL;
8902
8903 cmsgs->sinfo = CMSG_DATA(cmsg);
8904
8905 if (cmsgs->sinfo->snd_flags &
8906 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8907 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8908 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8909 return -EINVAL;
8910 break;
8911 case SCTP_PRINFO:
8912 /* SCTP Socket API Extension
8913 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8914 *
8915 * This cmsghdr structure specifies SCTP options for sendmsg().
8916 *
8917 * cmsg_level cmsg_type cmsg_data[]
8918 * ------------ ------------ ---------------------
8919 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8920 */
8921 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8922 return -EINVAL;
8923
8924 cmsgs->prinfo = CMSG_DATA(cmsg);
8925 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8926 return -EINVAL;
8927
8928 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8929 cmsgs->prinfo->pr_value = 0;
8930 break;
8931 case SCTP_AUTHINFO:
8932 /* SCTP Socket API Extension
8933 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8934 *
8935 * This cmsghdr structure specifies SCTP options for sendmsg().
8936 *
8937 * cmsg_level cmsg_type cmsg_data[]
8938 * ------------ ------------ ---------------------
8939 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8940 */
8941 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8942 return -EINVAL;
8943
8944 cmsgs->authinfo = CMSG_DATA(cmsg);
8945 break;
8946 case SCTP_DSTADDRV4:
8947 case SCTP_DSTADDRV6:
8948 /* SCTP Socket API Extension
8949 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8950 *
8951 * This cmsghdr structure specifies SCTP options for sendmsg().
8952 *
8953 * cmsg_level cmsg_type cmsg_data[]
8954 * ------------ ------------ ---------------------
8955 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8956 * ------------ ------------ ---------------------
8957 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8958 */
8959 cmsgs->addrs_msg = my_msg;
8960 break;
8961 default:
8962 return -EINVAL;
8963 }
8964 }
8965
8966 return 0;
8967}
8968
8969/*
8970 * Wait for a packet..
8971 * Note: This function is the same function as in core/datagram.c
8972 * with a few modifications to make lksctp work.
8973 */
8974static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8975{
8976 int error;
8977 DEFINE_WAIT(wait);
8978
8979 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8980
8981 /* Socket errors? */
8982 error = sock_error(sk);
8983 if (error)
8984 goto out;
8985
8986 if (!skb_queue_empty(&sk->sk_receive_queue))
8987 goto ready;
8988
8989 /* Socket shut down? */
8990 if (sk->sk_shutdown & RCV_SHUTDOWN)
8991 goto out;
8992
8993 /* Sequenced packets can come disconnected. If so we report the
8994 * problem.
8995 */
8996 error = -ENOTCONN;
8997
8998 /* Is there a good reason to think that we may receive some data? */
8999 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
9000 goto out;
9001
9002 /* Handle signals. */
9003 if (signal_pending(current))
9004 goto interrupted;
9005
9006 /* Let another process have a go. Since we are going to sleep
9007 * anyway. Note: This may cause odd behaviors if the message
9008 * does not fit in the user's buffer, but this seems to be the
9009 * only way to honor MSG_DONTWAIT realistically.
9010 */
9011 release_sock(sk);
9012 *timeo_p = schedule_timeout(*timeo_p);
9013 lock_sock(sk);
9014
9015ready:
9016 finish_wait(sk_sleep(sk), &wait);
9017 return 0;
9018
9019interrupted:
9020 error = sock_intr_errno(*timeo_p);
9021
9022out:
9023 finish_wait(sk_sleep(sk), &wait);
9024 *err = error;
9025 return error;
9026}
9027
9028/* Receive a datagram.
9029 * Note: This is pretty much the same routine as in core/datagram.c
9030 * with a few changes to make lksctp work.
9031 */
9032struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
9033{
9034 int error;
9035 struct sk_buff *skb;
9036 long timeo;
9037
9038 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
9039
9040 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
9041 MAX_SCHEDULE_TIMEOUT);
9042
9043 do {
9044 /* Again only user level code calls this function,
9045 * so nothing interrupt level
9046 * will suddenly eat the receive_queue.
9047 *
9048 * Look at current nfs client by the way...
9049 * However, this function was correct in any case. 8)
9050 */
9051 if (flags & MSG_PEEK) {
9052 skb = skb_peek(&sk->sk_receive_queue);
9053 if (skb)
9054 refcount_inc(&skb->users);
9055 } else {
9056 skb = __skb_dequeue(&sk->sk_receive_queue);
9057 }
9058
9059 if (skb)
9060 return skb;
9061
9062 /* Caller is allowed not to check sk->sk_err before calling. */
9063 error = sock_error(sk);
9064 if (error)
9065 goto no_packet;
9066
9067 if (sk->sk_shutdown & RCV_SHUTDOWN)
9068 break;
9069
9070
9071 /* User doesn't want to wait. */
9072 error = -EAGAIN;
9073 if (!timeo)
9074 goto no_packet;
9075 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
9076
9077 return NULL;
9078
9079no_packet:
9080 *err = error;
9081 return NULL;
9082}
9083
9084/* If sndbuf has changed, wake up per association sndbuf waiters. */
9085static void __sctp_write_space(struct sctp_association *asoc)
9086{
9087 struct sock *sk = asoc->base.sk;
9088
9089 if (sctp_wspace(asoc) <= 0)
9090 return;
9091
9092 if (waitqueue_active(&asoc->wait))
9093 wake_up_interruptible(&asoc->wait);
9094
9095 if (sctp_writeable(sk)) {
9096 struct socket_wq *wq;
9097
9098 rcu_read_lock();
9099 wq = rcu_dereference(sk->sk_wq);
9100 if (wq) {
9101 if (waitqueue_active(&wq->wait))
9102 wake_up_interruptible(&wq->wait);
9103
9104 /* Note that we try to include the Async I/O support
9105 * here by modeling from the current TCP/UDP code.
9106 * We have not tested with it yet.
9107 */
9108 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9109 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9110 }
9111 rcu_read_unlock();
9112 }
9113}
9114
9115static void sctp_wake_up_waiters(struct sock *sk,
9116 struct sctp_association *asoc)
9117{
9118 struct sctp_association *tmp = asoc;
9119
9120 /* We do accounting for the sndbuf space per association,
9121 * so we only need to wake our own association.
9122 */
9123 if (asoc->ep->sndbuf_policy)
9124 return __sctp_write_space(asoc);
9125
9126 /* If association goes down and is just flushing its
9127 * outq, then just normally notify others.
9128 */
9129 if (asoc->base.dead)
9130 return sctp_write_space(sk);
9131
9132 /* Accounting for the sndbuf space is per socket, so we
9133 * need to wake up others, try to be fair and in case of
9134 * other associations, let them have a go first instead
9135 * of just doing a sctp_write_space() call.
9136 *
9137 * Note that we reach sctp_wake_up_waiters() only when
9138 * associations free up queued chunks, thus we are under
9139 * lock and the list of associations on a socket is
9140 * guaranteed not to change.
9141 */
9142 for (tmp = list_next_entry(tmp, asocs); 1;
9143 tmp = list_next_entry(tmp, asocs)) {
9144 /* Manually skip the head element. */
9145 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9146 continue;
9147 /* Wake up association. */
9148 __sctp_write_space(tmp);
9149 /* We've reached the end. */
9150 if (tmp == asoc)
9151 break;
9152 }
9153}
9154
9155/* Do accounting for the sndbuf space.
9156 * Decrement the used sndbuf space of the corresponding association by the
9157 * data size which was just transmitted(freed).
9158 */
9159static void sctp_wfree(struct sk_buff *skb)
9160{
9161 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9162 struct sctp_association *asoc = chunk->asoc;
9163 struct sock *sk = asoc->base.sk;
9164
9165 sk_mem_uncharge(sk, skb->truesize);
9166 sk_wmem_queued_add(sk, -(skb->truesize + sizeof(struct sctp_chunk)));
9167 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9168 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9169 &sk->sk_wmem_alloc));
9170
9171 if (chunk->shkey) {
9172 struct sctp_shared_key *shkey = chunk->shkey;
9173
9174 /* refcnt == 2 and !list_empty mean after this release, it's
9175 * not being used anywhere, and it's time to notify userland
9176 * that this shkey can be freed if it's been deactivated.
9177 */
9178 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9179 refcount_read(&shkey->refcnt) == 2) {
9180 struct sctp_ulpevent *ev;
9181
9182 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9183 SCTP_AUTH_FREE_KEY,
9184 GFP_KERNEL);
9185 if (ev)
9186 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9187 }
9188 sctp_auth_shkey_release(chunk->shkey);
9189 }
9190
9191 sock_wfree(skb);
9192 sctp_wake_up_waiters(sk, asoc);
9193
9194 sctp_association_put(asoc);
9195}
9196
9197/* Do accounting for the receive space on the socket.
9198 * Accounting for the association is done in ulpevent.c
9199 * We set this as a destructor for the cloned data skbs so that
9200 * accounting is done at the correct time.
9201 */
9202void sctp_sock_rfree(struct sk_buff *skb)
9203{
9204 struct sock *sk = skb->sk;
9205 struct sctp_ulpevent *event = sctp_skb2event(skb);
9206
9207 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9208
9209 /*
9210 * Mimic the behavior of sock_rfree
9211 */
9212 sk_mem_uncharge(sk, event->rmem_len);
9213}
9214
9215
9216/* Helper function to wait for space in the sndbuf. */
9217static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9218 size_t msg_len)
9219{
9220 struct sock *sk = asoc->base.sk;
9221 long current_timeo = *timeo_p;
9222 DEFINE_WAIT(wait);
9223 int err = 0;
9224
9225 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9226 *timeo_p, msg_len);
9227
9228 /* Increment the association's refcnt. */
9229 sctp_association_hold(asoc);
9230
9231 /* Wait on the association specific sndbuf space. */
9232 for (;;) {
9233 prepare_to_wait_exclusive(&asoc->wait, &wait,
9234 TASK_INTERRUPTIBLE);
9235 if (asoc->base.dead)
9236 goto do_dead;
9237 if (!*timeo_p)
9238 goto do_nonblock;
9239 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9240 goto do_error;
9241 if (signal_pending(current))
9242 goto do_interrupted;
9243 if ((int)msg_len <= sctp_wspace(asoc) &&
9244 sk_wmem_schedule(sk, msg_len))
9245 break;
9246
9247 /* Let another process have a go. Since we are going
9248 * to sleep anyway.
9249 */
9250 release_sock(sk);
9251 current_timeo = schedule_timeout(current_timeo);
9252 lock_sock(sk);
9253 if (sk != asoc->base.sk)
9254 goto do_error;
9255
9256 *timeo_p = current_timeo;
9257 }
9258
9259out:
9260 finish_wait(&asoc->wait, &wait);
9261
9262 /* Release the association's refcnt. */
9263 sctp_association_put(asoc);
9264
9265 return err;
9266
9267do_dead:
9268 err = -ESRCH;
9269 goto out;
9270
9271do_error:
9272 err = -EPIPE;
9273 goto out;
9274
9275do_interrupted:
9276 err = sock_intr_errno(*timeo_p);
9277 goto out;
9278
9279do_nonblock:
9280 err = -EAGAIN;
9281 goto out;
9282}
9283
9284void sctp_data_ready(struct sock *sk)
9285{
9286 struct socket_wq *wq;
9287
9288 trace_sk_data_ready(sk);
9289
9290 rcu_read_lock();
9291 wq = rcu_dereference(sk->sk_wq);
9292 if (skwq_has_sleeper(wq))
9293 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9294 EPOLLRDNORM | EPOLLRDBAND);
9295 sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
9296 rcu_read_unlock();
9297}
9298
9299/* If socket sndbuf has changed, wake up all per association waiters. */
9300void sctp_write_space(struct sock *sk)
9301{
9302 struct sctp_association *asoc;
9303
9304 /* Wake up the tasks in each wait queue. */
9305 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9306 __sctp_write_space(asoc);
9307 }
9308}
9309
9310/* Is there any sndbuf space available on the socket?
9311 *
9312 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9313 * associations on the same socket. For a UDP-style socket with
9314 * multiple associations, it is possible for it to be "unwriteable"
9315 * prematurely. I assume that this is acceptable because
9316 * a premature "unwriteable" is better than an accidental "writeable" which
9317 * would cause an unwanted block under certain circumstances. For the 1-1
9318 * UDP-style sockets or TCP-style sockets, this code should work.
9319 * - Daisy
9320 */
9321static bool sctp_writeable(const struct sock *sk)
9322{
9323 return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
9324}
9325
9326/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9327 * returns immediately with EINPROGRESS.
9328 */
9329static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9330{
9331 struct sock *sk = asoc->base.sk;
9332 int err = 0;
9333 long current_timeo = *timeo_p;
9334 DEFINE_WAIT(wait);
9335
9336 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9337
9338 /* Increment the association's refcnt. */
9339 sctp_association_hold(asoc);
9340
9341 for (;;) {
9342 prepare_to_wait_exclusive(&asoc->wait, &wait,
9343 TASK_INTERRUPTIBLE);
9344 if (!*timeo_p)
9345 goto do_nonblock;
9346 if (sk->sk_shutdown & RCV_SHUTDOWN)
9347 break;
9348 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9349 asoc->base.dead)
9350 goto do_error;
9351 if (signal_pending(current))
9352 goto do_interrupted;
9353
9354 if (sctp_state(asoc, ESTABLISHED))
9355 break;
9356
9357 /* Let another process have a go. Since we are going
9358 * to sleep anyway.
9359 */
9360 release_sock(sk);
9361 current_timeo = schedule_timeout(current_timeo);
9362 lock_sock(sk);
9363
9364 *timeo_p = current_timeo;
9365 }
9366
9367out:
9368 finish_wait(&asoc->wait, &wait);
9369
9370 /* Release the association's refcnt. */
9371 sctp_association_put(asoc);
9372
9373 return err;
9374
9375do_error:
9376 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9377 err = -ETIMEDOUT;
9378 else
9379 err = -ECONNREFUSED;
9380 goto out;
9381
9382do_interrupted:
9383 err = sock_intr_errno(*timeo_p);
9384 goto out;
9385
9386do_nonblock:
9387 err = -EINPROGRESS;
9388 goto out;
9389}
9390
9391static int sctp_wait_for_accept(struct sock *sk, long timeo)
9392{
9393 struct sctp_endpoint *ep;
9394 int err = 0;
9395 DEFINE_WAIT(wait);
9396
9397 ep = sctp_sk(sk)->ep;
9398
9399
9400 for (;;) {
9401 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9402 TASK_INTERRUPTIBLE);
9403
9404 if (list_empty(&ep->asocs)) {
9405 release_sock(sk);
9406 timeo = schedule_timeout(timeo);
9407 lock_sock(sk);
9408 }
9409
9410 err = -EINVAL;
9411 if (!sctp_sstate(sk, LISTENING) ||
9412 (sk->sk_shutdown & RCV_SHUTDOWN))
9413 break;
9414
9415 err = 0;
9416 if (!list_empty(&ep->asocs))
9417 break;
9418
9419 err = sock_intr_errno(timeo);
9420 if (signal_pending(current))
9421 break;
9422
9423 err = -EAGAIN;
9424 if (!timeo)
9425 break;
9426 }
9427
9428 finish_wait(sk_sleep(sk), &wait);
9429
9430 return err;
9431}
9432
9433static void sctp_wait_for_close(struct sock *sk, long timeout)
9434{
9435 DEFINE_WAIT(wait);
9436
9437 do {
9438 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9439 if (list_empty(&sctp_sk(sk)->ep->asocs))
9440 break;
9441 release_sock(sk);
9442 timeout = schedule_timeout(timeout);
9443 lock_sock(sk);
9444 } while (!signal_pending(current) && timeout);
9445
9446 finish_wait(sk_sleep(sk), &wait);
9447}
9448
9449static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9450{
9451 struct sk_buff *frag;
9452
9453 if (!skb->data_len)
9454 goto done;
9455
9456 /* Don't forget the fragments. */
9457 skb_walk_frags(skb, frag)
9458 sctp_skb_set_owner_r_frag(frag, sk);
9459
9460done:
9461 sctp_skb_set_owner_r(skb, sk);
9462}
9463
9464void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9465 struct sctp_association *asoc)
9466{
9467 struct inet_sock *inet = inet_sk(sk);
9468 struct inet_sock *newinet;
9469 struct sctp_sock *sp = sctp_sk(sk);
9470
9471 newsk->sk_type = sk->sk_type;
9472 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9473 newsk->sk_flags = sk->sk_flags;
9474 newsk->sk_tsflags = sk->sk_tsflags;
9475 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9476 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9477 newsk->sk_reuse = sk->sk_reuse;
9478 sctp_sk(newsk)->reuse = sp->reuse;
9479
9480 newsk->sk_shutdown = sk->sk_shutdown;
9481 newsk->sk_destruct = sk->sk_destruct;
9482 newsk->sk_family = sk->sk_family;
9483 newsk->sk_protocol = IPPROTO_SCTP;
9484 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9485 newsk->sk_sndbuf = sk->sk_sndbuf;
9486 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9487 newsk->sk_lingertime = sk->sk_lingertime;
9488 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9489 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9490 newsk->sk_rxhash = sk->sk_rxhash;
9491
9492 newinet = inet_sk(newsk);
9493
9494 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9495 * getsockname() and getpeername()
9496 */
9497 newinet->inet_sport = inet->inet_sport;
9498 newinet->inet_saddr = inet->inet_saddr;
9499 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9500 newinet->inet_dport = htons(asoc->peer.port);
9501 newinet->pmtudisc = inet->pmtudisc;
9502 atomic_set(&newinet->inet_id, get_random_u16());
9503
9504 newinet->uc_ttl = inet->uc_ttl;
9505 inet_set_bit(MC_LOOP, newsk);
9506 newinet->mc_ttl = 1;
9507 newinet->mc_index = 0;
9508 newinet->mc_list = NULL;
9509
9510 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9511 net_enable_timestamp();
9512
9513 /* Set newsk security attributes from original sk and connection
9514 * security attribute from asoc.
9515 */
9516 security_sctp_sk_clone(asoc, sk, newsk);
9517}
9518
9519static inline void sctp_copy_descendant(struct sock *sk_to,
9520 const struct sock *sk_from)
9521{
9522 size_t ancestor_size = sizeof(struct inet_sock);
9523
9524 ancestor_size += sk_from->sk_prot->obj_size;
9525 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9526 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9527}
9528
9529/* Populate the fields of the newsk from the oldsk and migrate the assoc
9530 * and its messages to the newsk.
9531 */
9532static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9533 struct sctp_association *assoc,
9534 enum sctp_socket_type type)
9535{
9536 struct sctp_sock *oldsp = sctp_sk(oldsk);
9537 struct sctp_sock *newsp = sctp_sk(newsk);
9538 struct sctp_bind_bucket *pp; /* hash list port iterator */
9539 struct sctp_endpoint *newep = newsp->ep;
9540 struct sk_buff *skb, *tmp;
9541 struct sctp_ulpevent *event;
9542 struct sctp_bind_hashbucket *head;
9543 int err;
9544
9545 /* Migrate socket buffer sizes and all the socket level options to the
9546 * new socket.
9547 */
9548 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9549 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9550 /* Brute force copy old sctp opt. */
9551 sctp_copy_descendant(newsk, oldsk);
9552
9553 /* Restore the ep value that was overwritten with the above structure
9554 * copy.
9555 */
9556 newsp->ep = newep;
9557 newsp->hmac = NULL;
9558
9559 /* Hook this new socket in to the bind_hash list. */
9560 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9561 inet_sk(oldsk)->inet_num)];
9562 spin_lock_bh(&head->lock);
9563 pp = sctp_sk(oldsk)->bind_hash;
9564 sk_add_bind_node(newsk, &pp->owner);
9565 sctp_sk(newsk)->bind_hash = pp;
9566 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9567 spin_unlock_bh(&head->lock);
9568
9569 /* Copy the bind_addr list from the original endpoint to the new
9570 * endpoint so that we can handle restarts properly
9571 */
9572 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9573 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9574 if (err)
9575 return err;
9576
9577 /* New ep's auth_hmacs should be set if old ep's is set, in case
9578 * that net->sctp.auth_enable has been changed to 0 by users and
9579 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9580 */
9581 if (oldsp->ep->auth_hmacs) {
9582 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9583 if (err)
9584 return err;
9585 }
9586
9587 sctp_auto_asconf_init(newsp);
9588
9589 /* Move any messages in the old socket's receive queue that are for the
9590 * peeled off association to the new socket's receive queue.
9591 */
9592 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9593 event = sctp_skb2event(skb);
9594 if (event->asoc == assoc) {
9595 __skb_unlink(skb, &oldsk->sk_receive_queue);
9596 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9597 sctp_skb_set_owner_r_frag(skb, newsk);
9598 }
9599 }
9600
9601 /* Clean up any messages pending delivery due to partial
9602 * delivery. Three cases:
9603 * 1) No partial deliver; no work.
9604 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9605 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9606 */
9607 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9608
9609 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9610 struct sk_buff_head *queue;
9611
9612 /* Decide which queue to move pd_lobby skbs to. */
9613 if (assoc->ulpq.pd_mode) {
9614 queue = &newsp->pd_lobby;
9615 } else
9616 queue = &newsk->sk_receive_queue;
9617
9618 /* Walk through the pd_lobby, looking for skbs that
9619 * need moved to the new socket.
9620 */
9621 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9622 event = sctp_skb2event(skb);
9623 if (event->asoc == assoc) {
9624 __skb_unlink(skb, &oldsp->pd_lobby);
9625 __skb_queue_tail(queue, skb);
9626 sctp_skb_set_owner_r_frag(skb, newsk);
9627 }
9628 }
9629
9630 /* Clear up any skbs waiting for the partial
9631 * delivery to finish.
9632 */
9633 if (assoc->ulpq.pd_mode)
9634 sctp_clear_pd(oldsk, NULL);
9635
9636 }
9637
9638 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9639
9640 /* Set the type of socket to indicate that it is peeled off from the
9641 * original UDP-style socket or created with the accept() call on a
9642 * TCP-style socket..
9643 */
9644 newsp->type = type;
9645
9646 /* Mark the new socket "in-use" by the user so that any packets
9647 * that may arrive on the association after we've moved it are
9648 * queued to the backlog. This prevents a potential race between
9649 * backlog processing on the old socket and new-packet processing
9650 * on the new socket.
9651 *
9652 * The caller has just allocated newsk so we can guarantee that other
9653 * paths won't try to lock it and then oldsk.
9654 */
9655 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9656 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9657 sctp_assoc_migrate(assoc, newsk);
9658 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9659
9660 /* If the association on the newsk is already closed before accept()
9661 * is called, set RCV_SHUTDOWN flag.
9662 */
9663 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9664 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9665 newsk->sk_shutdown |= RCV_SHUTDOWN;
9666 } else {
9667 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9668 }
9669
9670 release_sock(newsk);
9671
9672 return 0;
9673}
9674
9675
9676/* This proto struct describes the ULP interface for SCTP. */
9677struct proto sctp_prot = {
9678 .name = "SCTP",
9679 .owner = THIS_MODULE,
9680 .close = sctp_close,
9681 .disconnect = sctp_disconnect,
9682 .accept = sctp_accept,
9683 .ioctl = sctp_ioctl,
9684 .init = sctp_init_sock,
9685 .destroy = sctp_destroy_sock,
9686 .shutdown = sctp_shutdown,
9687 .setsockopt = sctp_setsockopt,
9688 .getsockopt = sctp_getsockopt,
9689 .bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9690 .sendmsg = sctp_sendmsg,
9691 .recvmsg = sctp_recvmsg,
9692 .bind = sctp_bind,
9693 .bind_add = sctp_bind_add,
9694 .backlog_rcv = sctp_backlog_rcv,
9695 .hash = sctp_hash,
9696 .unhash = sctp_unhash,
9697 .no_autobind = true,
9698 .obj_size = sizeof(struct sctp_sock),
9699 .useroffset = offsetof(struct sctp_sock, subscribe),
9700 .usersize = offsetof(struct sctp_sock, initmsg) -
9701 offsetof(struct sctp_sock, subscribe) +
9702 sizeof_field(struct sctp_sock, initmsg),
9703 .sysctl_mem = sysctl_sctp_mem,
9704 .sysctl_rmem = sysctl_sctp_rmem,
9705 .sysctl_wmem = sysctl_sctp_wmem,
9706 .memory_pressure = &sctp_memory_pressure,
9707 .enter_memory_pressure = sctp_enter_memory_pressure,
9708
9709 .memory_allocated = &sctp_memory_allocated,
9710 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9711
9712 .sockets_allocated = &sctp_sockets_allocated,
9713};
9714
9715#if IS_ENABLED(CONFIG_IPV6)
9716
9717static void sctp_v6_destruct_sock(struct sock *sk)
9718{
9719 sctp_destruct_common(sk);
9720 inet6_sock_destruct(sk);
9721}
9722
9723static int sctp_v6_init_sock(struct sock *sk)
9724{
9725 int ret = sctp_init_sock(sk);
9726
9727 if (!ret)
9728 sk->sk_destruct = sctp_v6_destruct_sock;
9729
9730 return ret;
9731}
9732
9733struct proto sctpv6_prot = {
9734 .name = "SCTPv6",
9735 .owner = THIS_MODULE,
9736 .close = sctp_close,
9737 .disconnect = sctp_disconnect,
9738 .accept = sctp_accept,
9739 .ioctl = sctp_ioctl,
9740 .init = sctp_v6_init_sock,
9741 .destroy = sctp_destroy_sock,
9742 .shutdown = sctp_shutdown,
9743 .setsockopt = sctp_setsockopt,
9744 .getsockopt = sctp_getsockopt,
9745 .bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9746 .sendmsg = sctp_sendmsg,
9747 .recvmsg = sctp_recvmsg,
9748 .bind = sctp_bind,
9749 .bind_add = sctp_bind_add,
9750 .backlog_rcv = sctp_backlog_rcv,
9751 .hash = sctp_hash,
9752 .unhash = sctp_unhash,
9753 .no_autobind = true,
9754 .obj_size = sizeof(struct sctp6_sock),
9755 .ipv6_pinfo_offset = offsetof(struct sctp6_sock, inet6),
9756 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9757 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9758 offsetof(struct sctp6_sock, sctp.subscribe) +
9759 sizeof_field(struct sctp6_sock, sctp.initmsg),
9760 .sysctl_mem = sysctl_sctp_mem,
9761 .sysctl_rmem = sysctl_sctp_rmem,
9762 .sysctl_wmem = sysctl_sctp_wmem,
9763 .memory_pressure = &sctp_memory_pressure,
9764 .enter_memory_pressure = sctp_enter_memory_pressure,
9765
9766 .memory_allocated = &sctp_memory_allocated,
9767 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9768
9769 .sockets_allocated = &sctp_sockets_allocated,
9770};
9771#endif /* IS_ENABLED(CONFIG_IPV6) */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
10 * This file is part of the SCTP kernel implementation
11 *
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
14 *
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
18 *
19 * Please send any bug reports or fixes you make to the
20 * email address(es):
21 * lksctp developers <linux-sctp@vger.kernel.org>
22 *
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
36 */
37
38#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40#include <crypto/hash.h>
41#include <linux/types.h>
42#include <linux/kernel.h>
43#include <linux/wait.h>
44#include <linux/time.h>
45#include <linux/sched/signal.h>
46#include <linux/ip.h>
47#include <linux/capability.h>
48#include <linux/fcntl.h>
49#include <linux/poll.h>
50#include <linux/init.h>
51#include <linux/slab.h>
52#include <linux/file.h>
53#include <linux/compat.h>
54#include <linux/rhashtable.h>
55
56#include <net/ip.h>
57#include <net/icmp.h>
58#include <net/route.h>
59#include <net/ipv6.h>
60#include <net/inet_common.h>
61#include <net/busy_poll.h>
62
63#include <linux/socket.h> /* for sa_family_t */
64#include <linux/export.h>
65#include <net/sock.h>
66#include <net/sctp/sctp.h>
67#include <net/sctp/sm.h>
68#include <net/sctp/stream_sched.h>
69
70/* Forward declarations for internal helper functions. */
71static bool sctp_writeable(struct sock *sk);
72static void sctp_wfree(struct sk_buff *skb);
73static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
74 size_t msg_len);
75static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
76static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
77static int sctp_wait_for_accept(struct sock *sk, long timeo);
78static void sctp_wait_for_close(struct sock *sk, long timeo);
79static void sctp_destruct_sock(struct sock *sk);
80static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
81 union sctp_addr *addr, int len);
82static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
83static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
84static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
85static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
86static int sctp_send_asconf(struct sctp_association *asoc,
87 struct sctp_chunk *chunk);
88static int sctp_do_bind(struct sock *, union sctp_addr *, int);
89static int sctp_autobind(struct sock *sk);
90static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
91 struct sctp_association *assoc,
92 enum sctp_socket_type type);
93
94static unsigned long sctp_memory_pressure;
95static atomic_long_t sctp_memory_allocated;
96struct percpu_counter sctp_sockets_allocated;
97
98static void sctp_enter_memory_pressure(struct sock *sk)
99{
100 sctp_memory_pressure = 1;
101}
102
103
104/* Get the sndbuf space available at the time on the association. */
105static inline int sctp_wspace(struct sctp_association *asoc)
106{
107 struct sock *sk = asoc->base.sk;
108
109 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
110 : sk_stream_wspace(sk);
111}
112
113/* Increment the used sndbuf space count of the corresponding association by
114 * the size of the outgoing data chunk.
115 * Also, set the skb destructor for sndbuf accounting later.
116 *
117 * Since it is always 1-1 between chunk and skb, and also a new skb is always
118 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
119 * destructor in the data chunk skb for the purpose of the sndbuf space
120 * tracking.
121 */
122static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
123{
124 struct sctp_association *asoc = chunk->asoc;
125 struct sock *sk = asoc->base.sk;
126
127 /* The sndbuf space is tracked per association. */
128 sctp_association_hold(asoc);
129
130 if (chunk->shkey)
131 sctp_auth_shkey_hold(chunk->shkey);
132
133 skb_set_owner_w(chunk->skb, sk);
134
135 chunk->skb->destructor = sctp_wfree;
136 /* Save the chunk pointer in skb for sctp_wfree to use later. */
137 skb_shinfo(chunk->skb)->destructor_arg = chunk;
138
139 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
140 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
141 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 sk_mem_charge(sk, chunk->skb->truesize);
143}
144
145static void sctp_clear_owner_w(struct sctp_chunk *chunk)
146{
147 skb_orphan(chunk->skb);
148}
149
150static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
151 void (*cb)(struct sctp_chunk *))
152
153{
154 struct sctp_outq *q = &asoc->outqueue;
155 struct sctp_transport *t;
156 struct sctp_chunk *chunk;
157
158 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
159 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
160 cb(chunk);
161
162 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
163 cb(chunk);
164
165 list_for_each_entry(chunk, &q->sacked, transmitted_list)
166 cb(chunk);
167
168 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
169 cb(chunk);
170
171 list_for_each_entry(chunk, &q->out_chunk_list, list)
172 cb(chunk);
173}
174
175static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
176 void (*cb)(struct sk_buff *, struct sock *))
177
178{
179 struct sk_buff *skb, *tmp;
180
181 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
182 cb(skb, sk);
183
184 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
185 cb(skb, sk);
186
187 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
188 cb(skb, sk);
189}
190
191/* Verify that this is a valid address. */
192static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
193 int len)
194{
195 struct sctp_af *af;
196
197 /* Verify basic sockaddr. */
198 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
199 if (!af)
200 return -EINVAL;
201
202 /* Is this a valid SCTP address? */
203 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
204 return -EINVAL;
205
206 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
207 return -EINVAL;
208
209 return 0;
210}
211
212/* Look up the association by its id. If this is not a UDP-style
213 * socket, the ID field is always ignored.
214 */
215struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
216{
217 struct sctp_association *asoc = NULL;
218
219 /* If this is not a UDP-style socket, assoc id should be ignored. */
220 if (!sctp_style(sk, UDP)) {
221 /* Return NULL if the socket state is not ESTABLISHED. It
222 * could be a TCP-style listening socket or a socket which
223 * hasn't yet called connect() to establish an association.
224 */
225 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
226 return NULL;
227
228 /* Get the first and the only association from the list. */
229 if (!list_empty(&sctp_sk(sk)->ep->asocs))
230 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
231 struct sctp_association, asocs);
232 return asoc;
233 }
234
235 /* Otherwise this is a UDP-style socket. */
236 if (id <= SCTP_ALL_ASSOC)
237 return NULL;
238
239 spin_lock_bh(&sctp_assocs_id_lock);
240 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
241 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
242 asoc = NULL;
243 spin_unlock_bh(&sctp_assocs_id_lock);
244
245 return asoc;
246}
247
248/* Look up the transport from an address and an assoc id. If both address and
249 * id are specified, the associations matching the address and the id should be
250 * the same.
251 */
252static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
253 struct sockaddr_storage *addr,
254 sctp_assoc_t id)
255{
256 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
257 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
258 union sctp_addr *laddr = (union sctp_addr *)addr;
259 struct sctp_transport *transport;
260
261 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
262 return NULL;
263
264 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
265 laddr,
266 &transport);
267
268 if (!addr_asoc)
269 return NULL;
270
271 id_asoc = sctp_id2assoc(sk, id);
272 if (id_asoc && (id_asoc != addr_asoc))
273 return NULL;
274
275 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
276 (union sctp_addr *)addr);
277
278 return transport;
279}
280
281/* API 3.1.2 bind() - UDP Style Syntax
282 * The syntax of bind() is,
283 *
284 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
285 *
286 * sd - the socket descriptor returned by socket().
287 * addr - the address structure (struct sockaddr_in or struct
288 * sockaddr_in6 [RFC 2553]),
289 * addr_len - the size of the address structure.
290 */
291static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
292{
293 int retval = 0;
294
295 lock_sock(sk);
296
297 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
298 addr, addr_len);
299
300 /* Disallow binding twice. */
301 if (!sctp_sk(sk)->ep->base.bind_addr.port)
302 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
303 addr_len);
304 else
305 retval = -EINVAL;
306
307 release_sock(sk);
308
309 return retval;
310}
311
312static int sctp_get_port_local(struct sock *, union sctp_addr *);
313
314/* Verify this is a valid sockaddr. */
315static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
316 union sctp_addr *addr, int len)
317{
318 struct sctp_af *af;
319
320 /* Check minimum size. */
321 if (len < sizeof (struct sockaddr))
322 return NULL;
323
324 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
325 return NULL;
326
327 if (addr->sa.sa_family == AF_INET6) {
328 if (len < SIN6_LEN_RFC2133)
329 return NULL;
330 /* V4 mapped address are really of AF_INET family */
331 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
332 !opt->pf->af_supported(AF_INET, opt))
333 return NULL;
334 }
335
336 /* If we get this far, af is valid. */
337 af = sctp_get_af_specific(addr->sa.sa_family);
338
339 if (len < af->sockaddr_len)
340 return NULL;
341
342 return af;
343}
344
345/* Bind a local address either to an endpoint or to an association. */
346static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
347{
348 struct net *net = sock_net(sk);
349 struct sctp_sock *sp = sctp_sk(sk);
350 struct sctp_endpoint *ep = sp->ep;
351 struct sctp_bind_addr *bp = &ep->base.bind_addr;
352 struct sctp_af *af;
353 unsigned short snum;
354 int ret = 0;
355
356 /* Common sockaddr verification. */
357 af = sctp_sockaddr_af(sp, addr, len);
358 if (!af) {
359 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
360 __func__, sk, addr, len);
361 return -EINVAL;
362 }
363
364 snum = ntohs(addr->v4.sin_port);
365
366 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
367 __func__, sk, &addr->sa, bp->port, snum, len);
368
369 /* PF specific bind() address verification. */
370 if (!sp->pf->bind_verify(sp, addr))
371 return -EADDRNOTAVAIL;
372
373 /* We must either be unbound, or bind to the same port.
374 * It's OK to allow 0 ports if we are already bound.
375 * We'll just inhert an already bound port in this case
376 */
377 if (bp->port) {
378 if (!snum)
379 snum = bp->port;
380 else if (snum != bp->port) {
381 pr_debug("%s: new port %d doesn't match existing port "
382 "%d\n", __func__, snum, bp->port);
383 return -EINVAL;
384 }
385 }
386
387 if (snum && snum < inet_prot_sock(net) &&
388 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
389 return -EACCES;
390
391 /* See if the address matches any of the addresses we may have
392 * already bound before checking against other endpoints.
393 */
394 if (sctp_bind_addr_match(bp, addr, sp))
395 return -EINVAL;
396
397 /* Make sure we are allowed to bind here.
398 * The function sctp_get_port_local() does duplicate address
399 * detection.
400 */
401 addr->v4.sin_port = htons(snum);
402 if (sctp_get_port_local(sk, addr))
403 return -EADDRINUSE;
404
405 /* Refresh ephemeral port. */
406 if (!bp->port)
407 bp->port = inet_sk(sk)->inet_num;
408
409 /* Add the address to the bind address list.
410 * Use GFP_ATOMIC since BHs will be disabled.
411 */
412 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
413 SCTP_ADDR_SRC, GFP_ATOMIC);
414
415 if (ret) {
416 sctp_put_port(sk);
417 return ret;
418 }
419 /* Copy back into socket for getsockname() use. */
420 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
421 sp->pf->to_sk_saddr(addr, sk);
422
423 return ret;
424}
425
426 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
427 *
428 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
429 * at any one time. If a sender, after sending an ASCONF chunk, decides
430 * it needs to transfer another ASCONF Chunk, it MUST wait until the
431 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
432 * subsequent ASCONF. Note this restriction binds each side, so at any
433 * time two ASCONF may be in-transit on any given association (one sent
434 * from each endpoint).
435 */
436static int sctp_send_asconf(struct sctp_association *asoc,
437 struct sctp_chunk *chunk)
438{
439 struct net *net = sock_net(asoc->base.sk);
440 int retval = 0;
441
442 /* If there is an outstanding ASCONF chunk, queue it for later
443 * transmission.
444 */
445 if (asoc->addip_last_asconf) {
446 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
447 goto out;
448 }
449
450 /* Hold the chunk until an ASCONF_ACK is received. */
451 sctp_chunk_hold(chunk);
452 retval = sctp_primitive_ASCONF(net, asoc, chunk);
453 if (retval)
454 sctp_chunk_free(chunk);
455 else
456 asoc->addip_last_asconf = chunk;
457
458out:
459 return retval;
460}
461
462/* Add a list of addresses as bind addresses to local endpoint or
463 * association.
464 *
465 * Basically run through each address specified in the addrs/addrcnt
466 * array/length pair, determine if it is IPv6 or IPv4 and call
467 * sctp_do_bind() on it.
468 *
469 * If any of them fails, then the operation will be reversed and the
470 * ones that were added will be removed.
471 *
472 * Only sctp_setsockopt_bindx() is supposed to call this function.
473 */
474static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
475{
476 int cnt;
477 int retval = 0;
478 void *addr_buf;
479 struct sockaddr *sa_addr;
480 struct sctp_af *af;
481
482 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
483 addrs, addrcnt);
484
485 addr_buf = addrs;
486 for (cnt = 0; cnt < addrcnt; cnt++) {
487 /* The list may contain either IPv4 or IPv6 address;
488 * determine the address length for walking thru the list.
489 */
490 sa_addr = addr_buf;
491 af = sctp_get_af_specific(sa_addr->sa_family);
492 if (!af) {
493 retval = -EINVAL;
494 goto err_bindx_add;
495 }
496
497 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
498 af->sockaddr_len);
499
500 addr_buf += af->sockaddr_len;
501
502err_bindx_add:
503 if (retval < 0) {
504 /* Failed. Cleanup the ones that have been added */
505 if (cnt > 0)
506 sctp_bindx_rem(sk, addrs, cnt);
507 return retval;
508 }
509 }
510
511 return retval;
512}
513
514/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
515 * associations that are part of the endpoint indicating that a list of local
516 * addresses are added to the endpoint.
517 *
518 * If any of the addresses is already in the bind address list of the
519 * association, we do not send the chunk for that association. But it will not
520 * affect other associations.
521 *
522 * Only sctp_setsockopt_bindx() is supposed to call this function.
523 */
524static int sctp_send_asconf_add_ip(struct sock *sk,
525 struct sockaddr *addrs,
526 int addrcnt)
527{
528 struct sctp_sock *sp;
529 struct sctp_endpoint *ep;
530 struct sctp_association *asoc;
531 struct sctp_bind_addr *bp;
532 struct sctp_chunk *chunk;
533 struct sctp_sockaddr_entry *laddr;
534 union sctp_addr *addr;
535 union sctp_addr saveaddr;
536 void *addr_buf;
537 struct sctp_af *af;
538 struct list_head *p;
539 int i;
540 int retval = 0;
541
542 sp = sctp_sk(sk);
543 ep = sp->ep;
544
545 if (!ep->asconf_enable)
546 return retval;
547
548 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
549 __func__, sk, addrs, addrcnt);
550
551 list_for_each_entry(asoc, &ep->asocs, asocs) {
552 if (!asoc->peer.asconf_capable)
553 continue;
554
555 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
556 continue;
557
558 if (!sctp_state(asoc, ESTABLISHED))
559 continue;
560
561 /* Check if any address in the packed array of addresses is
562 * in the bind address list of the association. If so,
563 * do not send the asconf chunk to its peer, but continue with
564 * other associations.
565 */
566 addr_buf = addrs;
567 for (i = 0; i < addrcnt; i++) {
568 addr = addr_buf;
569 af = sctp_get_af_specific(addr->v4.sin_family);
570 if (!af) {
571 retval = -EINVAL;
572 goto out;
573 }
574
575 if (sctp_assoc_lookup_laddr(asoc, addr))
576 break;
577
578 addr_buf += af->sockaddr_len;
579 }
580 if (i < addrcnt)
581 continue;
582
583 /* Use the first valid address in bind addr list of
584 * association as Address Parameter of ASCONF CHUNK.
585 */
586 bp = &asoc->base.bind_addr;
587 p = bp->address_list.next;
588 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
589 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
590 addrcnt, SCTP_PARAM_ADD_IP);
591 if (!chunk) {
592 retval = -ENOMEM;
593 goto out;
594 }
595
596 /* Add the new addresses to the bind address list with
597 * use_as_src set to 0.
598 */
599 addr_buf = addrs;
600 for (i = 0; i < addrcnt; i++) {
601 addr = addr_buf;
602 af = sctp_get_af_specific(addr->v4.sin_family);
603 memcpy(&saveaddr, addr, af->sockaddr_len);
604 retval = sctp_add_bind_addr(bp, &saveaddr,
605 sizeof(saveaddr),
606 SCTP_ADDR_NEW, GFP_ATOMIC);
607 addr_buf += af->sockaddr_len;
608 }
609 if (asoc->src_out_of_asoc_ok) {
610 struct sctp_transport *trans;
611
612 list_for_each_entry(trans,
613 &asoc->peer.transport_addr_list, transports) {
614 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
615 2*asoc->pathmtu, 4380));
616 trans->ssthresh = asoc->peer.i.a_rwnd;
617 trans->rto = asoc->rto_initial;
618 sctp_max_rto(asoc, trans);
619 trans->rtt = trans->srtt = trans->rttvar = 0;
620 /* Clear the source and route cache */
621 sctp_transport_route(trans, NULL,
622 sctp_sk(asoc->base.sk));
623 }
624 }
625 retval = sctp_send_asconf(asoc, chunk);
626 }
627
628out:
629 return retval;
630}
631
632/* Remove a list of addresses from bind addresses list. Do not remove the
633 * last address.
634 *
635 * Basically run through each address specified in the addrs/addrcnt
636 * array/length pair, determine if it is IPv6 or IPv4 and call
637 * sctp_del_bind() on it.
638 *
639 * If any of them fails, then the operation will be reversed and the
640 * ones that were removed will be added back.
641 *
642 * At least one address has to be left; if only one address is
643 * available, the operation will return -EBUSY.
644 *
645 * Only sctp_setsockopt_bindx() is supposed to call this function.
646 */
647static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
648{
649 struct sctp_sock *sp = sctp_sk(sk);
650 struct sctp_endpoint *ep = sp->ep;
651 int cnt;
652 struct sctp_bind_addr *bp = &ep->base.bind_addr;
653 int retval = 0;
654 void *addr_buf;
655 union sctp_addr *sa_addr;
656 struct sctp_af *af;
657
658 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
659 __func__, sk, addrs, addrcnt);
660
661 addr_buf = addrs;
662 for (cnt = 0; cnt < addrcnt; cnt++) {
663 /* If the bind address list is empty or if there is only one
664 * bind address, there is nothing more to be removed (we need
665 * at least one address here).
666 */
667 if (list_empty(&bp->address_list) ||
668 (sctp_list_single_entry(&bp->address_list))) {
669 retval = -EBUSY;
670 goto err_bindx_rem;
671 }
672
673 sa_addr = addr_buf;
674 af = sctp_get_af_specific(sa_addr->sa.sa_family);
675 if (!af) {
676 retval = -EINVAL;
677 goto err_bindx_rem;
678 }
679
680 if (!af->addr_valid(sa_addr, sp, NULL)) {
681 retval = -EADDRNOTAVAIL;
682 goto err_bindx_rem;
683 }
684
685 if (sa_addr->v4.sin_port &&
686 sa_addr->v4.sin_port != htons(bp->port)) {
687 retval = -EINVAL;
688 goto err_bindx_rem;
689 }
690
691 if (!sa_addr->v4.sin_port)
692 sa_addr->v4.sin_port = htons(bp->port);
693
694 /* FIXME - There is probably a need to check if sk->sk_saddr and
695 * sk->sk_rcv_addr are currently set to one of the addresses to
696 * be removed. This is something which needs to be looked into
697 * when we are fixing the outstanding issues with multi-homing
698 * socket routing and failover schemes. Refer to comments in
699 * sctp_do_bind(). -daisy
700 */
701 retval = sctp_del_bind_addr(bp, sa_addr);
702
703 addr_buf += af->sockaddr_len;
704err_bindx_rem:
705 if (retval < 0) {
706 /* Failed. Add the ones that has been removed back */
707 if (cnt > 0)
708 sctp_bindx_add(sk, addrs, cnt);
709 return retval;
710 }
711 }
712
713 return retval;
714}
715
716/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
717 * the associations that are part of the endpoint indicating that a list of
718 * local addresses are removed from the endpoint.
719 *
720 * If any of the addresses is already in the bind address list of the
721 * association, we do not send the chunk for that association. But it will not
722 * affect other associations.
723 *
724 * Only sctp_setsockopt_bindx() is supposed to call this function.
725 */
726static int sctp_send_asconf_del_ip(struct sock *sk,
727 struct sockaddr *addrs,
728 int addrcnt)
729{
730 struct sctp_sock *sp;
731 struct sctp_endpoint *ep;
732 struct sctp_association *asoc;
733 struct sctp_transport *transport;
734 struct sctp_bind_addr *bp;
735 struct sctp_chunk *chunk;
736 union sctp_addr *laddr;
737 void *addr_buf;
738 struct sctp_af *af;
739 struct sctp_sockaddr_entry *saddr;
740 int i;
741 int retval = 0;
742 int stored = 0;
743
744 chunk = NULL;
745 sp = sctp_sk(sk);
746 ep = sp->ep;
747
748 if (!ep->asconf_enable)
749 return retval;
750
751 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
752 __func__, sk, addrs, addrcnt);
753
754 list_for_each_entry(asoc, &ep->asocs, asocs) {
755
756 if (!asoc->peer.asconf_capable)
757 continue;
758
759 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
760 continue;
761
762 if (!sctp_state(asoc, ESTABLISHED))
763 continue;
764
765 /* Check if any address in the packed array of addresses is
766 * not present in the bind address list of the association.
767 * If so, do not send the asconf chunk to its peer, but
768 * continue with other associations.
769 */
770 addr_buf = addrs;
771 for (i = 0; i < addrcnt; i++) {
772 laddr = addr_buf;
773 af = sctp_get_af_specific(laddr->v4.sin_family);
774 if (!af) {
775 retval = -EINVAL;
776 goto out;
777 }
778
779 if (!sctp_assoc_lookup_laddr(asoc, laddr))
780 break;
781
782 addr_buf += af->sockaddr_len;
783 }
784 if (i < addrcnt)
785 continue;
786
787 /* Find one address in the association's bind address list
788 * that is not in the packed array of addresses. This is to
789 * make sure that we do not delete all the addresses in the
790 * association.
791 */
792 bp = &asoc->base.bind_addr;
793 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
794 addrcnt, sp);
795 if ((laddr == NULL) && (addrcnt == 1)) {
796 if (asoc->asconf_addr_del_pending)
797 continue;
798 asoc->asconf_addr_del_pending =
799 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
800 if (asoc->asconf_addr_del_pending == NULL) {
801 retval = -ENOMEM;
802 goto out;
803 }
804 asoc->asconf_addr_del_pending->sa.sa_family =
805 addrs->sa_family;
806 asoc->asconf_addr_del_pending->v4.sin_port =
807 htons(bp->port);
808 if (addrs->sa_family == AF_INET) {
809 struct sockaddr_in *sin;
810
811 sin = (struct sockaddr_in *)addrs;
812 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
813 } else if (addrs->sa_family == AF_INET6) {
814 struct sockaddr_in6 *sin6;
815
816 sin6 = (struct sockaddr_in6 *)addrs;
817 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
818 }
819
820 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
821 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
822 asoc->asconf_addr_del_pending);
823
824 asoc->src_out_of_asoc_ok = 1;
825 stored = 1;
826 goto skip_mkasconf;
827 }
828
829 if (laddr == NULL)
830 return -EINVAL;
831
832 /* We do not need RCU protection throughout this loop
833 * because this is done under a socket lock from the
834 * setsockopt call.
835 */
836 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
837 SCTP_PARAM_DEL_IP);
838 if (!chunk) {
839 retval = -ENOMEM;
840 goto out;
841 }
842
843skip_mkasconf:
844 /* Reset use_as_src flag for the addresses in the bind address
845 * list that are to be deleted.
846 */
847 addr_buf = addrs;
848 for (i = 0; i < addrcnt; i++) {
849 laddr = addr_buf;
850 af = sctp_get_af_specific(laddr->v4.sin_family);
851 list_for_each_entry(saddr, &bp->address_list, list) {
852 if (sctp_cmp_addr_exact(&saddr->a, laddr))
853 saddr->state = SCTP_ADDR_DEL;
854 }
855 addr_buf += af->sockaddr_len;
856 }
857
858 /* Update the route and saddr entries for all the transports
859 * as some of the addresses in the bind address list are
860 * about to be deleted and cannot be used as source addresses.
861 */
862 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
863 transports) {
864 sctp_transport_route(transport, NULL,
865 sctp_sk(asoc->base.sk));
866 }
867
868 if (stored)
869 /* We don't need to transmit ASCONF */
870 continue;
871 retval = sctp_send_asconf(asoc, chunk);
872 }
873out:
874 return retval;
875}
876
877/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
878int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
879{
880 struct sock *sk = sctp_opt2sk(sp);
881 union sctp_addr *addr;
882 struct sctp_af *af;
883
884 /* It is safe to write port space in caller. */
885 addr = &addrw->a;
886 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
887 af = sctp_get_af_specific(addr->sa.sa_family);
888 if (!af)
889 return -EINVAL;
890 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
891 return -EINVAL;
892
893 if (addrw->state == SCTP_ADDR_NEW)
894 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
895 else
896 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
897}
898
899/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
900 *
901 * API 8.1
902 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
903 * int flags);
904 *
905 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
906 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
907 * or IPv6 addresses.
908 *
909 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
910 * Section 3.1.2 for this usage.
911 *
912 * addrs is a pointer to an array of one or more socket addresses. Each
913 * address is contained in its appropriate structure (i.e. struct
914 * sockaddr_in or struct sockaddr_in6) the family of the address type
915 * must be used to distinguish the address length (note that this
916 * representation is termed a "packed array" of addresses). The caller
917 * specifies the number of addresses in the array with addrcnt.
918 *
919 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
920 * -1, and sets errno to the appropriate error code.
921 *
922 * For SCTP, the port given in each socket address must be the same, or
923 * sctp_bindx() will fail, setting errno to EINVAL.
924 *
925 * The flags parameter is formed from the bitwise OR of zero or more of
926 * the following currently defined flags:
927 *
928 * SCTP_BINDX_ADD_ADDR
929 *
930 * SCTP_BINDX_REM_ADDR
931 *
932 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
933 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
934 * addresses from the association. The two flags are mutually exclusive;
935 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
936 * not remove all addresses from an association; sctp_bindx() will
937 * reject such an attempt with EINVAL.
938 *
939 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
940 * additional addresses with an endpoint after calling bind(). Or use
941 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
942 * socket is associated with so that no new association accepted will be
943 * associated with those addresses. If the endpoint supports dynamic
944 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
945 * endpoint to send the appropriate message to the peer to change the
946 * peers address lists.
947 *
948 * Adding and removing addresses from a connected association is
949 * optional functionality. Implementations that do not support this
950 * functionality should return EOPNOTSUPP.
951 *
952 * Basically do nothing but copying the addresses from user to kernel
953 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
954 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
955 * from userspace.
956 *
957 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
958 * it.
959 *
960 * sk The sk of the socket
961 * addrs The pointer to the addresses in user land
962 * addrssize Size of the addrs buffer
963 * op Operation to perform (add or remove, see the flags of
964 * sctp_bindx)
965 *
966 * Returns 0 if ok, <0 errno code on error.
967 */
968static int sctp_setsockopt_bindx(struct sock *sk,
969 struct sockaddr __user *addrs,
970 int addrs_size, int op)
971{
972 struct sockaddr *kaddrs;
973 int err;
974 int addrcnt = 0;
975 int walk_size = 0;
976 struct sockaddr *sa_addr;
977 void *addr_buf;
978 struct sctp_af *af;
979
980 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
981 __func__, sk, addrs, addrs_size, op);
982
983 if (unlikely(addrs_size <= 0))
984 return -EINVAL;
985
986 kaddrs = memdup_user(addrs, addrs_size);
987 if (IS_ERR(kaddrs))
988 return PTR_ERR(kaddrs);
989
990 /* Walk through the addrs buffer and count the number of addresses. */
991 addr_buf = kaddrs;
992 while (walk_size < addrs_size) {
993 if (walk_size + sizeof(sa_family_t) > addrs_size) {
994 kfree(kaddrs);
995 return -EINVAL;
996 }
997
998 sa_addr = addr_buf;
999 af = sctp_get_af_specific(sa_addr->sa_family);
1000
1001 /* If the address family is not supported or if this address
1002 * causes the address buffer to overflow return EINVAL.
1003 */
1004 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1005 kfree(kaddrs);
1006 return -EINVAL;
1007 }
1008 addrcnt++;
1009 addr_buf += af->sockaddr_len;
1010 walk_size += af->sockaddr_len;
1011 }
1012
1013 /* Do the work. */
1014 switch (op) {
1015 case SCTP_BINDX_ADD_ADDR:
1016 /* Allow security module to validate bindx addresses. */
1017 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1018 (struct sockaddr *)kaddrs,
1019 addrs_size);
1020 if (err)
1021 goto out;
1022 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1023 if (err)
1024 goto out;
1025 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1026 break;
1027
1028 case SCTP_BINDX_REM_ADDR:
1029 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1030 if (err)
1031 goto out;
1032 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1033 break;
1034
1035 default:
1036 err = -EINVAL;
1037 break;
1038 }
1039
1040out:
1041 kfree(kaddrs);
1042
1043 return err;
1044}
1045
1046static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1047 const union sctp_addr *daddr,
1048 const struct sctp_initmsg *init,
1049 struct sctp_transport **tp)
1050{
1051 struct sctp_association *asoc;
1052 struct sock *sk = ep->base.sk;
1053 struct net *net = sock_net(sk);
1054 enum sctp_scope scope;
1055 int err;
1056
1057 if (sctp_endpoint_is_peeled_off(ep, daddr))
1058 return -EADDRNOTAVAIL;
1059
1060 if (!ep->base.bind_addr.port) {
1061 if (sctp_autobind(sk))
1062 return -EAGAIN;
1063 } else {
1064 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1065 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1066 return -EACCES;
1067 }
1068
1069 scope = sctp_scope(daddr);
1070 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1071 if (!asoc)
1072 return -ENOMEM;
1073
1074 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1075 if (err < 0)
1076 goto free;
1077
1078 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1079 if (!*tp) {
1080 err = -ENOMEM;
1081 goto free;
1082 }
1083
1084 if (!init)
1085 return 0;
1086
1087 if (init->sinit_num_ostreams) {
1088 __u16 outcnt = init->sinit_num_ostreams;
1089
1090 asoc->c.sinit_num_ostreams = outcnt;
1091 /* outcnt has been changed, need to re-init stream */
1092 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1093 if (err)
1094 goto free;
1095 }
1096
1097 if (init->sinit_max_instreams)
1098 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1099
1100 if (init->sinit_max_attempts)
1101 asoc->max_init_attempts = init->sinit_max_attempts;
1102
1103 if (init->sinit_max_init_timeo)
1104 asoc->max_init_timeo =
1105 msecs_to_jiffies(init->sinit_max_init_timeo);
1106
1107 return 0;
1108free:
1109 sctp_association_free(asoc);
1110 return err;
1111}
1112
1113static int sctp_connect_add_peer(struct sctp_association *asoc,
1114 union sctp_addr *daddr, int addr_len)
1115{
1116 struct sctp_endpoint *ep = asoc->ep;
1117 struct sctp_association *old;
1118 struct sctp_transport *t;
1119 int err;
1120
1121 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1122 if (err)
1123 return err;
1124
1125 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1126 if (old && old != asoc)
1127 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1128 : -EALREADY;
1129
1130 if (sctp_endpoint_is_peeled_off(ep, daddr))
1131 return -EADDRNOTAVAIL;
1132
1133 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1134 if (!t)
1135 return -ENOMEM;
1136
1137 return 0;
1138}
1139
1140/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1141 *
1142 * Common routine for handling connect() and sctp_connectx().
1143 * Connect will come in with just a single address.
1144 */
1145static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1146 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1147{
1148 struct sctp_sock *sp = sctp_sk(sk);
1149 struct sctp_endpoint *ep = sp->ep;
1150 struct sctp_transport *transport;
1151 struct sctp_association *asoc;
1152 void *addr_buf = kaddrs;
1153 union sctp_addr *daddr;
1154 struct sctp_af *af;
1155 int walk_size, err;
1156 long timeo;
1157
1158 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1159 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1160 return -EISCONN;
1161
1162 daddr = addr_buf;
1163 af = sctp_get_af_specific(daddr->sa.sa_family);
1164 if (!af || af->sockaddr_len > addrs_size)
1165 return -EINVAL;
1166
1167 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1168 if (err)
1169 return err;
1170
1171 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1172 if (asoc)
1173 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1174 : -EALREADY;
1175
1176 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1177 if (err)
1178 return err;
1179 asoc = transport->asoc;
1180
1181 addr_buf += af->sockaddr_len;
1182 walk_size = af->sockaddr_len;
1183 while (walk_size < addrs_size) {
1184 err = -EINVAL;
1185 if (walk_size + sizeof(sa_family_t) > addrs_size)
1186 goto out_free;
1187
1188 daddr = addr_buf;
1189 af = sctp_get_af_specific(daddr->sa.sa_family);
1190 if (!af || af->sockaddr_len + walk_size > addrs_size)
1191 goto out_free;
1192
1193 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1194 goto out_free;
1195
1196 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1197 if (err)
1198 goto out_free;
1199
1200 addr_buf += af->sockaddr_len;
1201 walk_size += af->sockaddr_len;
1202 }
1203
1204 /* In case the user of sctp_connectx() wants an association
1205 * id back, assign one now.
1206 */
1207 if (assoc_id) {
1208 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1209 if (err < 0)
1210 goto out_free;
1211 }
1212
1213 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1214 if (err < 0)
1215 goto out_free;
1216
1217 /* Initialize sk's dport and daddr for getpeername() */
1218 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1219 sp->pf->to_sk_daddr(daddr, sk);
1220 sk->sk_err = 0;
1221
1222 if (assoc_id)
1223 *assoc_id = asoc->assoc_id;
1224
1225 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1226 return sctp_wait_for_connect(asoc, &timeo);
1227
1228out_free:
1229 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1230 __func__, asoc, kaddrs, err);
1231 sctp_association_free(asoc);
1232 return err;
1233}
1234
1235/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1236 *
1237 * API 8.9
1238 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1239 * sctp_assoc_t *asoc);
1240 *
1241 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1242 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1243 * or IPv6 addresses.
1244 *
1245 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1246 * Section 3.1.2 for this usage.
1247 *
1248 * addrs is a pointer to an array of one or more socket addresses. Each
1249 * address is contained in its appropriate structure (i.e. struct
1250 * sockaddr_in or struct sockaddr_in6) the family of the address type
1251 * must be used to distengish the address length (note that this
1252 * representation is termed a "packed array" of addresses). The caller
1253 * specifies the number of addresses in the array with addrcnt.
1254 *
1255 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1256 * the association id of the new association. On failure, sctp_connectx()
1257 * returns -1, and sets errno to the appropriate error code. The assoc_id
1258 * is not touched by the kernel.
1259 *
1260 * For SCTP, the port given in each socket address must be the same, or
1261 * sctp_connectx() will fail, setting errno to EINVAL.
1262 *
1263 * An application can use sctp_connectx to initiate an association with
1264 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1265 * allows a caller to specify multiple addresses at which a peer can be
1266 * reached. The way the SCTP stack uses the list of addresses to set up
1267 * the association is implementation dependent. This function only
1268 * specifies that the stack will try to make use of all the addresses in
1269 * the list when needed.
1270 *
1271 * Note that the list of addresses passed in is only used for setting up
1272 * the association. It does not necessarily equal the set of addresses
1273 * the peer uses for the resulting association. If the caller wants to
1274 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1275 * retrieve them after the association has been set up.
1276 *
1277 * Basically do nothing but copying the addresses from user to kernel
1278 * land and invoking either sctp_connectx(). This is used for tunneling
1279 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1280 *
1281 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1282 * it.
1283 *
1284 * sk The sk of the socket
1285 * addrs The pointer to the addresses in user land
1286 * addrssize Size of the addrs buffer
1287 *
1288 * Returns >=0 if ok, <0 errno code on error.
1289 */
1290static int __sctp_setsockopt_connectx(struct sock *sk,
1291 struct sockaddr __user *addrs,
1292 int addrs_size,
1293 sctp_assoc_t *assoc_id)
1294{
1295 struct sockaddr *kaddrs;
1296 int err = 0, flags = 0;
1297
1298 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1299 __func__, sk, addrs, addrs_size);
1300
1301 /* make sure the 1st addr's sa_family is accessible later */
1302 if (unlikely(addrs_size < sizeof(sa_family_t)))
1303 return -EINVAL;
1304
1305 kaddrs = memdup_user(addrs, addrs_size);
1306 if (IS_ERR(kaddrs))
1307 return PTR_ERR(kaddrs);
1308
1309 /* Allow security module to validate connectx addresses. */
1310 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1311 (struct sockaddr *)kaddrs,
1312 addrs_size);
1313 if (err)
1314 goto out_free;
1315
1316 /* in-kernel sockets don't generally have a file allocated to them
1317 * if all they do is call sock_create_kern().
1318 */
1319 if (sk->sk_socket->file)
1320 flags = sk->sk_socket->file->f_flags;
1321
1322 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1323
1324out_free:
1325 kfree(kaddrs);
1326
1327 return err;
1328}
1329
1330/*
1331 * This is an older interface. It's kept for backward compatibility
1332 * to the option that doesn't provide association id.
1333 */
1334static int sctp_setsockopt_connectx_old(struct sock *sk,
1335 struct sockaddr __user *addrs,
1336 int addrs_size)
1337{
1338 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1339}
1340
1341/*
1342 * New interface for the API. The since the API is done with a socket
1343 * option, to make it simple we feed back the association id is as a return
1344 * indication to the call. Error is always negative and association id is
1345 * always positive.
1346 */
1347static int sctp_setsockopt_connectx(struct sock *sk,
1348 struct sockaddr __user *addrs,
1349 int addrs_size)
1350{
1351 sctp_assoc_t assoc_id = 0;
1352 int err = 0;
1353
1354 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1355
1356 if (err)
1357 return err;
1358 else
1359 return assoc_id;
1360}
1361
1362/*
1363 * New (hopefully final) interface for the API.
1364 * We use the sctp_getaddrs_old structure so that use-space library
1365 * can avoid any unnecessary allocations. The only different part
1366 * is that we store the actual length of the address buffer into the
1367 * addrs_num structure member. That way we can re-use the existing
1368 * code.
1369 */
1370#ifdef CONFIG_COMPAT
1371struct compat_sctp_getaddrs_old {
1372 sctp_assoc_t assoc_id;
1373 s32 addr_num;
1374 compat_uptr_t addrs; /* struct sockaddr * */
1375};
1376#endif
1377
1378static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1379 char __user *optval,
1380 int __user *optlen)
1381{
1382 struct sctp_getaddrs_old param;
1383 sctp_assoc_t assoc_id = 0;
1384 int err = 0;
1385
1386#ifdef CONFIG_COMPAT
1387 if (in_compat_syscall()) {
1388 struct compat_sctp_getaddrs_old param32;
1389
1390 if (len < sizeof(param32))
1391 return -EINVAL;
1392 if (copy_from_user(¶m32, optval, sizeof(param32)))
1393 return -EFAULT;
1394
1395 param.assoc_id = param32.assoc_id;
1396 param.addr_num = param32.addr_num;
1397 param.addrs = compat_ptr(param32.addrs);
1398 } else
1399#endif
1400 {
1401 if (len < sizeof(param))
1402 return -EINVAL;
1403 if (copy_from_user(¶m, optval, sizeof(param)))
1404 return -EFAULT;
1405 }
1406
1407 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1408 param.addrs, param.addr_num,
1409 &assoc_id);
1410 if (err == 0 || err == -EINPROGRESS) {
1411 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1412 return -EFAULT;
1413 if (put_user(sizeof(assoc_id), optlen))
1414 return -EFAULT;
1415 }
1416
1417 return err;
1418}
1419
1420/* API 3.1.4 close() - UDP Style Syntax
1421 * Applications use close() to perform graceful shutdown (as described in
1422 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1423 * by a UDP-style socket.
1424 *
1425 * The syntax is
1426 *
1427 * ret = close(int sd);
1428 *
1429 * sd - the socket descriptor of the associations to be closed.
1430 *
1431 * To gracefully shutdown a specific association represented by the
1432 * UDP-style socket, an application should use the sendmsg() call,
1433 * passing no user data, but including the appropriate flag in the
1434 * ancillary data (see Section xxxx).
1435 *
1436 * If sd in the close() call is a branched-off socket representing only
1437 * one association, the shutdown is performed on that association only.
1438 *
1439 * 4.1.6 close() - TCP Style Syntax
1440 *
1441 * Applications use close() to gracefully close down an association.
1442 *
1443 * The syntax is:
1444 *
1445 * int close(int sd);
1446 *
1447 * sd - the socket descriptor of the association to be closed.
1448 *
1449 * After an application calls close() on a socket descriptor, no further
1450 * socket operations will succeed on that descriptor.
1451 *
1452 * API 7.1.4 SO_LINGER
1453 *
1454 * An application using the TCP-style socket can use this option to
1455 * perform the SCTP ABORT primitive. The linger option structure is:
1456 *
1457 * struct linger {
1458 * int l_onoff; // option on/off
1459 * int l_linger; // linger time
1460 * };
1461 *
1462 * To enable the option, set l_onoff to 1. If the l_linger value is set
1463 * to 0, calling close() is the same as the ABORT primitive. If the
1464 * value is set to a negative value, the setsockopt() call will return
1465 * an error. If the value is set to a positive value linger_time, the
1466 * close() can be blocked for at most linger_time ms. If the graceful
1467 * shutdown phase does not finish during this period, close() will
1468 * return but the graceful shutdown phase continues in the system.
1469 */
1470static void sctp_close(struct sock *sk, long timeout)
1471{
1472 struct net *net = sock_net(sk);
1473 struct sctp_endpoint *ep;
1474 struct sctp_association *asoc;
1475 struct list_head *pos, *temp;
1476 unsigned int data_was_unread;
1477
1478 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1479
1480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1481 sk->sk_shutdown = SHUTDOWN_MASK;
1482 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1483
1484 ep = sctp_sk(sk)->ep;
1485
1486 /* Clean up any skbs sitting on the receive queue. */
1487 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1488 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1489
1490 /* Walk all associations on an endpoint. */
1491 list_for_each_safe(pos, temp, &ep->asocs) {
1492 asoc = list_entry(pos, struct sctp_association, asocs);
1493
1494 if (sctp_style(sk, TCP)) {
1495 /* A closed association can still be in the list if
1496 * it belongs to a TCP-style listening socket that is
1497 * not yet accepted. If so, free it. If not, send an
1498 * ABORT or SHUTDOWN based on the linger options.
1499 */
1500 if (sctp_state(asoc, CLOSED)) {
1501 sctp_association_free(asoc);
1502 continue;
1503 }
1504 }
1505
1506 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1507 !skb_queue_empty(&asoc->ulpq.reasm) ||
1508 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1509 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1510 struct sctp_chunk *chunk;
1511
1512 chunk = sctp_make_abort_user(asoc, NULL, 0);
1513 sctp_primitive_ABORT(net, asoc, chunk);
1514 } else
1515 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1516 }
1517
1518 /* On a TCP-style socket, block for at most linger_time if set. */
1519 if (sctp_style(sk, TCP) && timeout)
1520 sctp_wait_for_close(sk, timeout);
1521
1522 /* This will run the backlog queue. */
1523 release_sock(sk);
1524
1525 /* Supposedly, no process has access to the socket, but
1526 * the net layers still may.
1527 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1528 * held and that should be grabbed before socket lock.
1529 */
1530 spin_lock_bh(&net->sctp.addr_wq_lock);
1531 bh_lock_sock_nested(sk);
1532
1533 /* Hold the sock, since sk_common_release() will put sock_put()
1534 * and we have just a little more cleanup.
1535 */
1536 sock_hold(sk);
1537 sk_common_release(sk);
1538
1539 bh_unlock_sock(sk);
1540 spin_unlock_bh(&net->sctp.addr_wq_lock);
1541
1542 sock_put(sk);
1543
1544 SCTP_DBG_OBJCNT_DEC(sock);
1545}
1546
1547/* Handle EPIPE error. */
1548static int sctp_error(struct sock *sk, int flags, int err)
1549{
1550 if (err == -EPIPE)
1551 err = sock_error(sk) ? : -EPIPE;
1552 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1553 send_sig(SIGPIPE, current, 0);
1554 return err;
1555}
1556
1557/* API 3.1.3 sendmsg() - UDP Style Syntax
1558 *
1559 * An application uses sendmsg() and recvmsg() calls to transmit data to
1560 * and receive data from its peer.
1561 *
1562 * ssize_t sendmsg(int socket, const struct msghdr *message,
1563 * int flags);
1564 *
1565 * socket - the socket descriptor of the endpoint.
1566 * message - pointer to the msghdr structure which contains a single
1567 * user message and possibly some ancillary data.
1568 *
1569 * See Section 5 for complete description of the data
1570 * structures.
1571 *
1572 * flags - flags sent or received with the user message, see Section
1573 * 5 for complete description of the flags.
1574 *
1575 * Note: This function could use a rewrite especially when explicit
1576 * connect support comes in.
1577 */
1578/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1579
1580static int sctp_msghdr_parse(const struct msghdr *msg,
1581 struct sctp_cmsgs *cmsgs);
1582
1583static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1584 struct sctp_sndrcvinfo *srinfo,
1585 const struct msghdr *msg, size_t msg_len)
1586{
1587 __u16 sflags;
1588 int err;
1589
1590 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1591 return -EPIPE;
1592
1593 if (msg_len > sk->sk_sndbuf)
1594 return -EMSGSIZE;
1595
1596 memset(cmsgs, 0, sizeof(*cmsgs));
1597 err = sctp_msghdr_parse(msg, cmsgs);
1598 if (err) {
1599 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1600 return err;
1601 }
1602
1603 memset(srinfo, 0, sizeof(*srinfo));
1604 if (cmsgs->srinfo) {
1605 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1606 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1607 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1608 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1609 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1610 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1611 }
1612
1613 if (cmsgs->sinfo) {
1614 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1615 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1616 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1617 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1618 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1619 }
1620
1621 if (cmsgs->prinfo) {
1622 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1623 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1624 cmsgs->prinfo->pr_policy);
1625 }
1626
1627 sflags = srinfo->sinfo_flags;
1628 if (!sflags && msg_len)
1629 return 0;
1630
1631 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1632 return -EINVAL;
1633
1634 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1635 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1636 return -EINVAL;
1637
1638 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1639 return -EINVAL;
1640
1641 return 0;
1642}
1643
1644static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1645 struct sctp_cmsgs *cmsgs,
1646 union sctp_addr *daddr,
1647 struct sctp_transport **tp)
1648{
1649 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1650 struct sctp_association *asoc;
1651 struct cmsghdr *cmsg;
1652 __be32 flowinfo = 0;
1653 struct sctp_af *af;
1654 int err;
1655
1656 *tp = NULL;
1657
1658 if (sflags & (SCTP_EOF | SCTP_ABORT))
1659 return -EINVAL;
1660
1661 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1662 sctp_sstate(sk, CLOSING)))
1663 return -EADDRNOTAVAIL;
1664
1665 /* Label connection socket for first association 1-to-many
1666 * style for client sequence socket()->sendmsg(). This
1667 * needs to be done before sctp_assoc_add_peer() as that will
1668 * set up the initial packet that needs to account for any
1669 * security ip options (CIPSO/CALIPSO) added to the packet.
1670 */
1671 af = sctp_get_af_specific(daddr->sa.sa_family);
1672 if (!af)
1673 return -EINVAL;
1674 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1675 (struct sockaddr *)daddr,
1676 af->sockaddr_len);
1677 if (err < 0)
1678 return err;
1679
1680 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1681 if (err)
1682 return err;
1683 asoc = (*tp)->asoc;
1684
1685 if (!cmsgs->addrs_msg)
1686 return 0;
1687
1688 if (daddr->sa.sa_family == AF_INET6)
1689 flowinfo = daddr->v6.sin6_flowinfo;
1690
1691 /* sendv addr list parse */
1692 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1693 union sctp_addr _daddr;
1694 int dlen;
1695
1696 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1697 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1698 cmsg->cmsg_type != SCTP_DSTADDRV6))
1699 continue;
1700
1701 daddr = &_daddr;
1702 memset(daddr, 0, sizeof(*daddr));
1703 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1704 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1705 if (dlen < sizeof(struct in_addr)) {
1706 err = -EINVAL;
1707 goto free;
1708 }
1709
1710 dlen = sizeof(struct in_addr);
1711 daddr->v4.sin_family = AF_INET;
1712 daddr->v4.sin_port = htons(asoc->peer.port);
1713 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1714 } else {
1715 if (dlen < sizeof(struct in6_addr)) {
1716 err = -EINVAL;
1717 goto free;
1718 }
1719
1720 dlen = sizeof(struct in6_addr);
1721 daddr->v6.sin6_flowinfo = flowinfo;
1722 daddr->v6.sin6_family = AF_INET6;
1723 daddr->v6.sin6_port = htons(asoc->peer.port);
1724 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1725 }
1726
1727 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1728 if (err)
1729 goto free;
1730 }
1731
1732 return 0;
1733
1734free:
1735 sctp_association_free(asoc);
1736 return err;
1737}
1738
1739static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1740 __u16 sflags, struct msghdr *msg,
1741 size_t msg_len)
1742{
1743 struct sock *sk = asoc->base.sk;
1744 struct net *net = sock_net(sk);
1745
1746 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1747 return -EPIPE;
1748
1749 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1750 !sctp_state(asoc, ESTABLISHED))
1751 return 0;
1752
1753 if (sflags & SCTP_EOF) {
1754 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1755 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1756
1757 return 0;
1758 }
1759
1760 if (sflags & SCTP_ABORT) {
1761 struct sctp_chunk *chunk;
1762
1763 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1764 if (!chunk)
1765 return -ENOMEM;
1766
1767 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1768 sctp_primitive_ABORT(net, asoc, chunk);
1769 iov_iter_revert(&msg->msg_iter, msg_len);
1770
1771 return 0;
1772 }
1773
1774 return 1;
1775}
1776
1777static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1778 struct msghdr *msg, size_t msg_len,
1779 struct sctp_transport *transport,
1780 struct sctp_sndrcvinfo *sinfo)
1781{
1782 struct sock *sk = asoc->base.sk;
1783 struct sctp_sock *sp = sctp_sk(sk);
1784 struct net *net = sock_net(sk);
1785 struct sctp_datamsg *datamsg;
1786 bool wait_connect = false;
1787 struct sctp_chunk *chunk;
1788 long timeo;
1789 int err;
1790
1791 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1792 err = -EINVAL;
1793 goto err;
1794 }
1795
1796 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1797 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1798 if (err)
1799 goto err;
1800 }
1801
1802 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1803 err = -EMSGSIZE;
1804 goto err;
1805 }
1806
1807 if (asoc->pmtu_pending) {
1808 if (sp->param_flags & SPP_PMTUD_ENABLE)
1809 sctp_assoc_sync_pmtu(asoc);
1810 asoc->pmtu_pending = 0;
1811 }
1812
1813 if (sctp_wspace(asoc) < (int)msg_len)
1814 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1815
1816 if (sk_under_memory_pressure(sk))
1817 sk_mem_reclaim(sk);
1818
1819 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1820 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1821 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1822 if (err)
1823 goto err;
1824 }
1825
1826 if (sctp_state(asoc, CLOSED)) {
1827 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1828 if (err)
1829 goto err;
1830
1831 if (asoc->ep->intl_enable) {
1832 timeo = sock_sndtimeo(sk, 0);
1833 err = sctp_wait_for_connect(asoc, &timeo);
1834 if (err) {
1835 err = -ESRCH;
1836 goto err;
1837 }
1838 } else {
1839 wait_connect = true;
1840 }
1841
1842 pr_debug("%s: we associated primitively\n", __func__);
1843 }
1844
1845 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1846 if (IS_ERR(datamsg)) {
1847 err = PTR_ERR(datamsg);
1848 goto err;
1849 }
1850
1851 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1852
1853 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1854 sctp_chunk_hold(chunk);
1855 sctp_set_owner_w(chunk);
1856 chunk->transport = transport;
1857 }
1858
1859 err = sctp_primitive_SEND(net, asoc, datamsg);
1860 if (err) {
1861 sctp_datamsg_free(datamsg);
1862 goto err;
1863 }
1864
1865 pr_debug("%s: we sent primitively\n", __func__);
1866
1867 sctp_datamsg_put(datamsg);
1868
1869 if (unlikely(wait_connect)) {
1870 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1871 sctp_wait_for_connect(asoc, &timeo);
1872 }
1873
1874 err = msg_len;
1875
1876err:
1877 return err;
1878}
1879
1880static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1881 const struct msghdr *msg,
1882 struct sctp_cmsgs *cmsgs)
1883{
1884 union sctp_addr *daddr = NULL;
1885 int err;
1886
1887 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1888 int len = msg->msg_namelen;
1889
1890 if (len > sizeof(*daddr))
1891 len = sizeof(*daddr);
1892
1893 daddr = (union sctp_addr *)msg->msg_name;
1894
1895 err = sctp_verify_addr(sk, daddr, len);
1896 if (err)
1897 return ERR_PTR(err);
1898 }
1899
1900 return daddr;
1901}
1902
1903static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1904 struct sctp_sndrcvinfo *sinfo,
1905 struct sctp_cmsgs *cmsgs)
1906{
1907 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1908 sinfo->sinfo_stream = asoc->default_stream;
1909 sinfo->sinfo_ppid = asoc->default_ppid;
1910 sinfo->sinfo_context = asoc->default_context;
1911 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1912
1913 if (!cmsgs->prinfo)
1914 sinfo->sinfo_flags = asoc->default_flags;
1915 }
1916
1917 if (!cmsgs->srinfo && !cmsgs->prinfo)
1918 sinfo->sinfo_timetolive = asoc->default_timetolive;
1919
1920 if (cmsgs->authinfo) {
1921 /* Reuse sinfo_tsn to indicate that authinfo was set and
1922 * sinfo_ssn to save the keyid on tx path.
1923 */
1924 sinfo->sinfo_tsn = 1;
1925 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1926 }
1927}
1928
1929static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1930{
1931 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1932 struct sctp_transport *transport = NULL;
1933 struct sctp_sndrcvinfo _sinfo, *sinfo;
1934 struct sctp_association *asoc, *tmp;
1935 struct sctp_cmsgs cmsgs;
1936 union sctp_addr *daddr;
1937 bool new = false;
1938 __u16 sflags;
1939 int err;
1940
1941 /* Parse and get snd_info */
1942 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1943 if (err)
1944 goto out;
1945
1946 sinfo = &_sinfo;
1947 sflags = sinfo->sinfo_flags;
1948
1949 /* Get daddr from msg */
1950 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1951 if (IS_ERR(daddr)) {
1952 err = PTR_ERR(daddr);
1953 goto out;
1954 }
1955
1956 lock_sock(sk);
1957
1958 /* SCTP_SENDALL process */
1959 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1960 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1961 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1962 msg_len);
1963 if (err == 0)
1964 continue;
1965 if (err < 0)
1966 goto out_unlock;
1967
1968 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1969
1970 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1971 NULL, sinfo);
1972 if (err < 0)
1973 goto out_unlock;
1974
1975 iov_iter_revert(&msg->msg_iter, err);
1976 }
1977
1978 goto out_unlock;
1979 }
1980
1981 /* Get and check or create asoc */
1982 if (daddr) {
1983 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1984 if (asoc) {
1985 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1986 msg_len);
1987 if (err <= 0)
1988 goto out_unlock;
1989 } else {
1990 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1991 &transport);
1992 if (err)
1993 goto out_unlock;
1994
1995 asoc = transport->asoc;
1996 new = true;
1997 }
1998
1999 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2000 transport = NULL;
2001 } else {
2002 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2003 if (!asoc) {
2004 err = -EPIPE;
2005 goto out_unlock;
2006 }
2007
2008 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2009 if (err <= 0)
2010 goto out_unlock;
2011 }
2012
2013 /* Update snd_info with the asoc */
2014 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2015
2016 /* Send msg to the asoc */
2017 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2018 if (err < 0 && err != -ESRCH && new)
2019 sctp_association_free(asoc);
2020
2021out_unlock:
2022 release_sock(sk);
2023out:
2024 return sctp_error(sk, msg->msg_flags, err);
2025}
2026
2027/* This is an extended version of skb_pull() that removes the data from the
2028 * start of a skb even when data is spread across the list of skb's in the
2029 * frag_list. len specifies the total amount of data that needs to be removed.
2030 * when 'len' bytes could be removed from the skb, it returns 0.
2031 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2032 * could not be removed.
2033 */
2034static int sctp_skb_pull(struct sk_buff *skb, int len)
2035{
2036 struct sk_buff *list;
2037 int skb_len = skb_headlen(skb);
2038 int rlen;
2039
2040 if (len <= skb_len) {
2041 __skb_pull(skb, len);
2042 return 0;
2043 }
2044 len -= skb_len;
2045 __skb_pull(skb, skb_len);
2046
2047 skb_walk_frags(skb, list) {
2048 rlen = sctp_skb_pull(list, len);
2049 skb->len -= (len-rlen);
2050 skb->data_len -= (len-rlen);
2051
2052 if (!rlen)
2053 return 0;
2054
2055 len = rlen;
2056 }
2057
2058 return len;
2059}
2060
2061/* API 3.1.3 recvmsg() - UDP Style Syntax
2062 *
2063 * ssize_t recvmsg(int socket, struct msghdr *message,
2064 * int flags);
2065 *
2066 * socket - the socket descriptor of the endpoint.
2067 * message - pointer to the msghdr structure which contains a single
2068 * user message and possibly some ancillary data.
2069 *
2070 * See Section 5 for complete description of the data
2071 * structures.
2072 *
2073 * flags - flags sent or received with the user message, see Section
2074 * 5 for complete description of the flags.
2075 */
2076static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2077 int noblock, int flags, int *addr_len)
2078{
2079 struct sctp_ulpevent *event = NULL;
2080 struct sctp_sock *sp = sctp_sk(sk);
2081 struct sk_buff *skb, *head_skb;
2082 int copied;
2083 int err = 0;
2084 int skb_len;
2085
2086 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2087 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2088 addr_len);
2089
2090 lock_sock(sk);
2091
2092 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2093 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2094 err = -ENOTCONN;
2095 goto out;
2096 }
2097
2098 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2099 if (!skb)
2100 goto out;
2101
2102 /* Get the total length of the skb including any skb's in the
2103 * frag_list.
2104 */
2105 skb_len = skb->len;
2106
2107 copied = skb_len;
2108 if (copied > len)
2109 copied = len;
2110
2111 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2112
2113 event = sctp_skb2event(skb);
2114
2115 if (err)
2116 goto out_free;
2117
2118 if (event->chunk && event->chunk->head_skb)
2119 head_skb = event->chunk->head_skb;
2120 else
2121 head_skb = skb;
2122 sock_recv_ts_and_drops(msg, sk, head_skb);
2123 if (sctp_ulpevent_is_notification(event)) {
2124 msg->msg_flags |= MSG_NOTIFICATION;
2125 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2126 } else {
2127 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2128 }
2129
2130 /* Check if we allow SCTP_NXTINFO. */
2131 if (sp->recvnxtinfo)
2132 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2133 /* Check if we allow SCTP_RCVINFO. */
2134 if (sp->recvrcvinfo)
2135 sctp_ulpevent_read_rcvinfo(event, msg);
2136 /* Check if we allow SCTP_SNDRCVINFO. */
2137 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2138 sctp_ulpevent_read_sndrcvinfo(event, msg);
2139
2140 err = copied;
2141
2142 /* If skb's length exceeds the user's buffer, update the skb and
2143 * push it back to the receive_queue so that the next call to
2144 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2145 */
2146 if (skb_len > copied) {
2147 msg->msg_flags &= ~MSG_EOR;
2148 if (flags & MSG_PEEK)
2149 goto out_free;
2150 sctp_skb_pull(skb, copied);
2151 skb_queue_head(&sk->sk_receive_queue, skb);
2152
2153 /* When only partial message is copied to the user, increase
2154 * rwnd by that amount. If all the data in the skb is read,
2155 * rwnd is updated when the event is freed.
2156 */
2157 if (!sctp_ulpevent_is_notification(event))
2158 sctp_assoc_rwnd_increase(event->asoc, copied);
2159 goto out;
2160 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2161 (event->msg_flags & MSG_EOR))
2162 msg->msg_flags |= MSG_EOR;
2163 else
2164 msg->msg_flags &= ~MSG_EOR;
2165
2166out_free:
2167 if (flags & MSG_PEEK) {
2168 /* Release the skb reference acquired after peeking the skb in
2169 * sctp_skb_recv_datagram().
2170 */
2171 kfree_skb(skb);
2172 } else {
2173 /* Free the event which includes releasing the reference to
2174 * the owner of the skb, freeing the skb and updating the
2175 * rwnd.
2176 */
2177 sctp_ulpevent_free(event);
2178 }
2179out:
2180 release_sock(sk);
2181 return err;
2182}
2183
2184/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2185 *
2186 * This option is a on/off flag. If enabled no SCTP message
2187 * fragmentation will be performed. Instead if a message being sent
2188 * exceeds the current PMTU size, the message will NOT be sent and
2189 * instead a error will be indicated to the user.
2190 */
2191static int sctp_setsockopt_disable_fragments(struct sock *sk,
2192 char __user *optval,
2193 unsigned int optlen)
2194{
2195 int val;
2196
2197 if (optlen < sizeof(int))
2198 return -EINVAL;
2199
2200 if (get_user(val, (int __user *)optval))
2201 return -EFAULT;
2202
2203 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2204
2205 return 0;
2206}
2207
2208static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2209 unsigned int optlen)
2210{
2211 struct sctp_event_subscribe subscribe;
2212 __u8 *sn_type = (__u8 *)&subscribe;
2213 struct sctp_sock *sp = sctp_sk(sk);
2214 struct sctp_association *asoc;
2215 int i;
2216
2217 if (optlen > sizeof(struct sctp_event_subscribe))
2218 return -EINVAL;
2219
2220 if (copy_from_user(&subscribe, optval, optlen))
2221 return -EFAULT;
2222
2223 for (i = 0; i < optlen; i++)
2224 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2225 sn_type[i]);
2226
2227 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2228 asoc->subscribe = sctp_sk(sk)->subscribe;
2229
2230 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2231 * if there is no data to be sent or retransmit, the stack will
2232 * immediately send up this notification.
2233 */
2234 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2235 struct sctp_ulpevent *event;
2236
2237 asoc = sctp_id2assoc(sk, 0);
2238 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2239 event = sctp_ulpevent_make_sender_dry_event(asoc,
2240 GFP_USER | __GFP_NOWARN);
2241 if (!event)
2242 return -ENOMEM;
2243
2244 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2245 }
2246 }
2247
2248 return 0;
2249}
2250
2251/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2252 *
2253 * This socket option is applicable to the UDP-style socket only. When
2254 * set it will cause associations that are idle for more than the
2255 * specified number of seconds to automatically close. An association
2256 * being idle is defined an association that has NOT sent or received
2257 * user data. The special value of '0' indicates that no automatic
2258 * close of any associations should be performed. The option expects an
2259 * integer defining the number of seconds of idle time before an
2260 * association is closed.
2261 */
2262static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2263 unsigned int optlen)
2264{
2265 struct sctp_sock *sp = sctp_sk(sk);
2266 struct net *net = sock_net(sk);
2267
2268 /* Applicable to UDP-style socket only */
2269 if (sctp_style(sk, TCP))
2270 return -EOPNOTSUPP;
2271 if (optlen != sizeof(int))
2272 return -EINVAL;
2273 if (copy_from_user(&sp->autoclose, optval, optlen))
2274 return -EFAULT;
2275
2276 if (sp->autoclose > net->sctp.max_autoclose)
2277 sp->autoclose = net->sctp.max_autoclose;
2278
2279 return 0;
2280}
2281
2282/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2283 *
2284 * Applications can enable or disable heartbeats for any peer address of
2285 * an association, modify an address's heartbeat interval, force a
2286 * heartbeat to be sent immediately, and adjust the address's maximum
2287 * number of retransmissions sent before an address is considered
2288 * unreachable. The following structure is used to access and modify an
2289 * address's parameters:
2290 *
2291 * struct sctp_paddrparams {
2292 * sctp_assoc_t spp_assoc_id;
2293 * struct sockaddr_storage spp_address;
2294 * uint32_t spp_hbinterval;
2295 * uint16_t spp_pathmaxrxt;
2296 * uint32_t spp_pathmtu;
2297 * uint32_t spp_sackdelay;
2298 * uint32_t spp_flags;
2299 * uint32_t spp_ipv6_flowlabel;
2300 * uint8_t spp_dscp;
2301 * };
2302 *
2303 * spp_assoc_id - (one-to-many style socket) This is filled in the
2304 * application, and identifies the association for
2305 * this query.
2306 * spp_address - This specifies which address is of interest.
2307 * spp_hbinterval - This contains the value of the heartbeat interval,
2308 * in milliseconds. If a value of zero
2309 * is present in this field then no changes are to
2310 * be made to this parameter.
2311 * spp_pathmaxrxt - This contains the maximum number of
2312 * retransmissions before this address shall be
2313 * considered unreachable. If a value of zero
2314 * is present in this field then no changes are to
2315 * be made to this parameter.
2316 * spp_pathmtu - When Path MTU discovery is disabled the value
2317 * specified here will be the "fixed" path mtu.
2318 * Note that if the spp_address field is empty
2319 * then all associations on this address will
2320 * have this fixed path mtu set upon them.
2321 *
2322 * spp_sackdelay - When delayed sack is enabled, this value specifies
2323 * the number of milliseconds that sacks will be delayed
2324 * for. This value will apply to all addresses of an
2325 * association if the spp_address field is empty. Note
2326 * also, that if delayed sack is enabled and this
2327 * value is set to 0, no change is made to the last
2328 * recorded delayed sack timer value.
2329 *
2330 * spp_flags - These flags are used to control various features
2331 * on an association. The flag field may contain
2332 * zero or more of the following options.
2333 *
2334 * SPP_HB_ENABLE - Enable heartbeats on the
2335 * specified address. Note that if the address
2336 * field is empty all addresses for the association
2337 * have heartbeats enabled upon them.
2338 *
2339 * SPP_HB_DISABLE - Disable heartbeats on the
2340 * speicifed address. Note that if the address
2341 * field is empty all addresses for the association
2342 * will have their heartbeats disabled. Note also
2343 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2344 * mutually exclusive, only one of these two should
2345 * be specified. Enabling both fields will have
2346 * undetermined results.
2347 *
2348 * SPP_HB_DEMAND - Request a user initiated heartbeat
2349 * to be made immediately.
2350 *
2351 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2352 * heartbeat delayis to be set to the value of 0
2353 * milliseconds.
2354 *
2355 * SPP_PMTUD_ENABLE - This field will enable PMTU
2356 * discovery upon the specified address. Note that
2357 * if the address feild is empty then all addresses
2358 * on the association are effected.
2359 *
2360 * SPP_PMTUD_DISABLE - This field will disable PMTU
2361 * discovery upon the specified address. Note that
2362 * if the address feild is empty then all addresses
2363 * on the association are effected. Not also that
2364 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2365 * exclusive. Enabling both will have undetermined
2366 * results.
2367 *
2368 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2369 * on delayed sack. The time specified in spp_sackdelay
2370 * is used to specify the sack delay for this address. Note
2371 * that if spp_address is empty then all addresses will
2372 * enable delayed sack and take on the sack delay
2373 * value specified in spp_sackdelay.
2374 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2375 * off delayed sack. If the spp_address field is blank then
2376 * delayed sack is disabled for the entire association. Note
2377 * also that this field is mutually exclusive to
2378 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2379 * results.
2380 *
2381 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2382 * setting of the IPV6 flow label value. The value is
2383 * contained in the spp_ipv6_flowlabel field.
2384 * Upon retrieval, this flag will be set to indicate that
2385 * the spp_ipv6_flowlabel field has a valid value returned.
2386 * If a specific destination address is set (in the
2387 * spp_address field), then the value returned is that of
2388 * the address. If just an association is specified (and
2389 * no address), then the association's default flow label
2390 * is returned. If neither an association nor a destination
2391 * is specified, then the socket's default flow label is
2392 * returned. For non-IPv6 sockets, this flag will be left
2393 * cleared.
2394 *
2395 * SPP_DSCP: Setting this flag enables the setting of the
2396 * Differentiated Services Code Point (DSCP) value
2397 * associated with either the association or a specific
2398 * address. The value is obtained in the spp_dscp field.
2399 * Upon retrieval, this flag will be set to indicate that
2400 * the spp_dscp field has a valid value returned. If a
2401 * specific destination address is set when called (in the
2402 * spp_address field), then that specific destination
2403 * address's DSCP value is returned. If just an association
2404 * is specified, then the association's default DSCP is
2405 * returned. If neither an association nor a destination is
2406 * specified, then the socket's default DSCP is returned.
2407 *
2408 * spp_ipv6_flowlabel
2409 * - This field is used in conjunction with the
2410 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2411 * The 20 least significant bits are used for the flow
2412 * label. This setting has precedence over any IPv6-layer
2413 * setting.
2414 *
2415 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2416 * and contains the DSCP. The 6 most significant bits are
2417 * used for the DSCP. This setting has precedence over any
2418 * IPv4- or IPv6- layer setting.
2419 */
2420static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2421 struct sctp_transport *trans,
2422 struct sctp_association *asoc,
2423 struct sctp_sock *sp,
2424 int hb_change,
2425 int pmtud_change,
2426 int sackdelay_change)
2427{
2428 int error;
2429
2430 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2431 struct net *net = sock_net(trans->asoc->base.sk);
2432
2433 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2434 if (error)
2435 return error;
2436 }
2437
2438 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2439 * this field is ignored. Note also that a value of zero indicates
2440 * the current setting should be left unchanged.
2441 */
2442 if (params->spp_flags & SPP_HB_ENABLE) {
2443
2444 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2445 * set. This lets us use 0 value when this flag
2446 * is set.
2447 */
2448 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2449 params->spp_hbinterval = 0;
2450
2451 if (params->spp_hbinterval ||
2452 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2453 if (trans) {
2454 trans->hbinterval =
2455 msecs_to_jiffies(params->spp_hbinterval);
2456 } else if (asoc) {
2457 asoc->hbinterval =
2458 msecs_to_jiffies(params->spp_hbinterval);
2459 } else {
2460 sp->hbinterval = params->spp_hbinterval;
2461 }
2462 }
2463 }
2464
2465 if (hb_change) {
2466 if (trans) {
2467 trans->param_flags =
2468 (trans->param_flags & ~SPP_HB) | hb_change;
2469 } else if (asoc) {
2470 asoc->param_flags =
2471 (asoc->param_flags & ~SPP_HB) | hb_change;
2472 } else {
2473 sp->param_flags =
2474 (sp->param_flags & ~SPP_HB) | hb_change;
2475 }
2476 }
2477
2478 /* When Path MTU discovery is disabled the value specified here will
2479 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2480 * include the flag SPP_PMTUD_DISABLE for this field to have any
2481 * effect).
2482 */
2483 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2484 if (trans) {
2485 trans->pathmtu = params->spp_pathmtu;
2486 sctp_assoc_sync_pmtu(asoc);
2487 } else if (asoc) {
2488 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2489 } else {
2490 sp->pathmtu = params->spp_pathmtu;
2491 }
2492 }
2493
2494 if (pmtud_change) {
2495 if (trans) {
2496 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2497 (params->spp_flags & SPP_PMTUD_ENABLE);
2498 trans->param_flags =
2499 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2500 if (update) {
2501 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2502 sctp_assoc_sync_pmtu(asoc);
2503 }
2504 } else if (asoc) {
2505 asoc->param_flags =
2506 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2507 } else {
2508 sp->param_flags =
2509 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2510 }
2511 }
2512
2513 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2514 * value of this field is ignored. Note also that a value of zero
2515 * indicates the current setting should be left unchanged.
2516 */
2517 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2518 if (trans) {
2519 trans->sackdelay =
2520 msecs_to_jiffies(params->spp_sackdelay);
2521 } else if (asoc) {
2522 asoc->sackdelay =
2523 msecs_to_jiffies(params->spp_sackdelay);
2524 } else {
2525 sp->sackdelay = params->spp_sackdelay;
2526 }
2527 }
2528
2529 if (sackdelay_change) {
2530 if (trans) {
2531 trans->param_flags =
2532 (trans->param_flags & ~SPP_SACKDELAY) |
2533 sackdelay_change;
2534 } else if (asoc) {
2535 asoc->param_flags =
2536 (asoc->param_flags & ~SPP_SACKDELAY) |
2537 sackdelay_change;
2538 } else {
2539 sp->param_flags =
2540 (sp->param_flags & ~SPP_SACKDELAY) |
2541 sackdelay_change;
2542 }
2543 }
2544
2545 /* Note that a value of zero indicates the current setting should be
2546 left unchanged.
2547 */
2548 if (params->spp_pathmaxrxt) {
2549 if (trans) {
2550 trans->pathmaxrxt = params->spp_pathmaxrxt;
2551 } else if (asoc) {
2552 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2553 } else {
2554 sp->pathmaxrxt = params->spp_pathmaxrxt;
2555 }
2556 }
2557
2558 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2559 if (trans) {
2560 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2561 trans->flowlabel = params->spp_ipv6_flowlabel &
2562 SCTP_FLOWLABEL_VAL_MASK;
2563 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2564 }
2565 } else if (asoc) {
2566 struct sctp_transport *t;
2567
2568 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2569 transports) {
2570 if (t->ipaddr.sa.sa_family != AF_INET6)
2571 continue;
2572 t->flowlabel = params->spp_ipv6_flowlabel &
2573 SCTP_FLOWLABEL_VAL_MASK;
2574 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2575 }
2576 asoc->flowlabel = params->spp_ipv6_flowlabel &
2577 SCTP_FLOWLABEL_VAL_MASK;
2578 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2579 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2580 sp->flowlabel = params->spp_ipv6_flowlabel &
2581 SCTP_FLOWLABEL_VAL_MASK;
2582 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2583 }
2584 }
2585
2586 if (params->spp_flags & SPP_DSCP) {
2587 if (trans) {
2588 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2589 trans->dscp |= SCTP_DSCP_SET_MASK;
2590 } else if (asoc) {
2591 struct sctp_transport *t;
2592
2593 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2594 transports) {
2595 t->dscp = params->spp_dscp &
2596 SCTP_DSCP_VAL_MASK;
2597 t->dscp |= SCTP_DSCP_SET_MASK;
2598 }
2599 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2600 asoc->dscp |= SCTP_DSCP_SET_MASK;
2601 } else {
2602 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2603 sp->dscp |= SCTP_DSCP_SET_MASK;
2604 }
2605 }
2606
2607 return 0;
2608}
2609
2610static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2611 char __user *optval,
2612 unsigned int optlen)
2613{
2614 struct sctp_paddrparams params;
2615 struct sctp_transport *trans = NULL;
2616 struct sctp_association *asoc = NULL;
2617 struct sctp_sock *sp = sctp_sk(sk);
2618 int error;
2619 int hb_change, pmtud_change, sackdelay_change;
2620
2621 if (optlen == sizeof(params)) {
2622 if (copy_from_user(¶ms, optval, optlen))
2623 return -EFAULT;
2624 } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2625 spp_ipv6_flowlabel), 4)) {
2626 if (copy_from_user(¶ms, optval, optlen))
2627 return -EFAULT;
2628 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2629 return -EINVAL;
2630 } else {
2631 return -EINVAL;
2632 }
2633
2634 /* Validate flags and value parameters. */
2635 hb_change = params.spp_flags & SPP_HB;
2636 pmtud_change = params.spp_flags & SPP_PMTUD;
2637 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2638
2639 if (hb_change == SPP_HB ||
2640 pmtud_change == SPP_PMTUD ||
2641 sackdelay_change == SPP_SACKDELAY ||
2642 params.spp_sackdelay > 500 ||
2643 (params.spp_pathmtu &&
2644 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2645 return -EINVAL;
2646
2647 /* If an address other than INADDR_ANY is specified, and
2648 * no transport is found, then the request is invalid.
2649 */
2650 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2651 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2652 params.spp_assoc_id);
2653 if (!trans)
2654 return -EINVAL;
2655 }
2656
2657 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2658 * socket is a one to many style socket, and an association
2659 * was not found, then the id was invalid.
2660 */
2661 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2662 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2663 sctp_style(sk, UDP))
2664 return -EINVAL;
2665
2666 /* Heartbeat demand can only be sent on a transport or
2667 * association, but not a socket.
2668 */
2669 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2670 return -EINVAL;
2671
2672 /* Process parameters. */
2673 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2674 hb_change, pmtud_change,
2675 sackdelay_change);
2676
2677 if (error)
2678 return error;
2679
2680 /* If changes are for association, also apply parameters to each
2681 * transport.
2682 */
2683 if (!trans && asoc) {
2684 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2685 transports) {
2686 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2687 hb_change, pmtud_change,
2688 sackdelay_change);
2689 }
2690 }
2691
2692 return 0;
2693}
2694
2695static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2696{
2697 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2698}
2699
2700static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2701{
2702 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2703}
2704
2705static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2706 struct sctp_association *asoc)
2707{
2708 struct sctp_transport *trans;
2709
2710 if (params->sack_delay) {
2711 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2712 asoc->param_flags =
2713 sctp_spp_sackdelay_enable(asoc->param_flags);
2714 }
2715 if (params->sack_freq == 1) {
2716 asoc->param_flags =
2717 sctp_spp_sackdelay_disable(asoc->param_flags);
2718 } else if (params->sack_freq > 1) {
2719 asoc->sackfreq = params->sack_freq;
2720 asoc->param_flags =
2721 sctp_spp_sackdelay_enable(asoc->param_flags);
2722 }
2723
2724 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2725 transports) {
2726 if (params->sack_delay) {
2727 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2728 trans->param_flags =
2729 sctp_spp_sackdelay_enable(trans->param_flags);
2730 }
2731 if (params->sack_freq == 1) {
2732 trans->param_flags =
2733 sctp_spp_sackdelay_disable(trans->param_flags);
2734 } else if (params->sack_freq > 1) {
2735 trans->sackfreq = params->sack_freq;
2736 trans->param_flags =
2737 sctp_spp_sackdelay_enable(trans->param_flags);
2738 }
2739 }
2740}
2741
2742/*
2743 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2744 *
2745 * This option will effect the way delayed acks are performed. This
2746 * option allows you to get or set the delayed ack time, in
2747 * milliseconds. It also allows changing the delayed ack frequency.
2748 * Changing the frequency to 1 disables the delayed sack algorithm. If
2749 * the assoc_id is 0, then this sets or gets the endpoints default
2750 * values. If the assoc_id field is non-zero, then the set or get
2751 * effects the specified association for the one to many model (the
2752 * assoc_id field is ignored by the one to one model). Note that if
2753 * sack_delay or sack_freq are 0 when setting this option, then the
2754 * current values will remain unchanged.
2755 *
2756 * struct sctp_sack_info {
2757 * sctp_assoc_t sack_assoc_id;
2758 * uint32_t sack_delay;
2759 * uint32_t sack_freq;
2760 * };
2761 *
2762 * sack_assoc_id - This parameter, indicates which association the user
2763 * is performing an action upon. Note that if this field's value is
2764 * zero then the endpoints default value is changed (effecting future
2765 * associations only).
2766 *
2767 * sack_delay - This parameter contains the number of milliseconds that
2768 * the user is requesting the delayed ACK timer be set to. Note that
2769 * this value is defined in the standard to be between 200 and 500
2770 * milliseconds.
2771 *
2772 * sack_freq - This parameter contains the number of packets that must
2773 * be received before a sack is sent without waiting for the delay
2774 * timer to expire. The default value for this is 2, setting this
2775 * value to 1 will disable the delayed sack algorithm.
2776 */
2777
2778static int sctp_setsockopt_delayed_ack(struct sock *sk,
2779 char __user *optval, unsigned int optlen)
2780{
2781 struct sctp_sock *sp = sctp_sk(sk);
2782 struct sctp_association *asoc;
2783 struct sctp_sack_info params;
2784
2785 if (optlen == sizeof(struct sctp_sack_info)) {
2786 if (copy_from_user(¶ms, optval, optlen))
2787 return -EFAULT;
2788
2789 if (params.sack_delay == 0 && params.sack_freq == 0)
2790 return 0;
2791 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2792 pr_warn_ratelimited(DEPRECATED
2793 "%s (pid %d) "
2794 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2795 "Use struct sctp_sack_info instead\n",
2796 current->comm, task_pid_nr(current));
2797 if (copy_from_user(¶ms, optval, optlen))
2798 return -EFAULT;
2799
2800 if (params.sack_delay == 0)
2801 params.sack_freq = 1;
2802 else
2803 params.sack_freq = 0;
2804 } else
2805 return -EINVAL;
2806
2807 /* Validate value parameter. */
2808 if (params.sack_delay > 500)
2809 return -EINVAL;
2810
2811 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2812 * socket is a one to many style socket, and an association
2813 * was not found, then the id was invalid.
2814 */
2815 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2816 if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2817 sctp_style(sk, UDP))
2818 return -EINVAL;
2819
2820 if (asoc) {
2821 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2822
2823 return 0;
2824 }
2825
2826 if (sctp_style(sk, TCP))
2827 params.sack_assoc_id = SCTP_FUTURE_ASSOC;
2828
2829 if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2830 params.sack_assoc_id == SCTP_ALL_ASSOC) {
2831 if (params.sack_delay) {
2832 sp->sackdelay = params.sack_delay;
2833 sp->param_flags =
2834 sctp_spp_sackdelay_enable(sp->param_flags);
2835 }
2836 if (params.sack_freq == 1) {
2837 sp->param_flags =
2838 sctp_spp_sackdelay_disable(sp->param_flags);
2839 } else if (params.sack_freq > 1) {
2840 sp->sackfreq = params.sack_freq;
2841 sp->param_flags =
2842 sctp_spp_sackdelay_enable(sp->param_flags);
2843 }
2844 }
2845
2846 if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2847 params.sack_assoc_id == SCTP_ALL_ASSOC)
2848 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2849 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2850
2851 return 0;
2852}
2853
2854/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2855 *
2856 * Applications can specify protocol parameters for the default association
2857 * initialization. The option name argument to setsockopt() and getsockopt()
2858 * is SCTP_INITMSG.
2859 *
2860 * Setting initialization parameters is effective only on an unconnected
2861 * socket (for UDP-style sockets only future associations are effected
2862 * by the change). With TCP-style sockets, this option is inherited by
2863 * sockets derived from a listener socket.
2864 */
2865static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2866{
2867 struct sctp_initmsg sinit;
2868 struct sctp_sock *sp = sctp_sk(sk);
2869
2870 if (optlen != sizeof(struct sctp_initmsg))
2871 return -EINVAL;
2872 if (copy_from_user(&sinit, optval, optlen))
2873 return -EFAULT;
2874
2875 if (sinit.sinit_num_ostreams)
2876 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2877 if (sinit.sinit_max_instreams)
2878 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2879 if (sinit.sinit_max_attempts)
2880 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2881 if (sinit.sinit_max_init_timeo)
2882 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2883
2884 return 0;
2885}
2886
2887/*
2888 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2889 *
2890 * Applications that wish to use the sendto() system call may wish to
2891 * specify a default set of parameters that would normally be supplied
2892 * through the inclusion of ancillary data. This socket option allows
2893 * such an application to set the default sctp_sndrcvinfo structure.
2894 * The application that wishes to use this socket option simply passes
2895 * in to this call the sctp_sndrcvinfo structure defined in Section
2896 * 5.2.2) The input parameters accepted by this call include
2897 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2898 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2899 * to this call if the caller is using the UDP model.
2900 */
2901static int sctp_setsockopt_default_send_param(struct sock *sk,
2902 char __user *optval,
2903 unsigned int optlen)
2904{
2905 struct sctp_sock *sp = sctp_sk(sk);
2906 struct sctp_association *asoc;
2907 struct sctp_sndrcvinfo info;
2908
2909 if (optlen != sizeof(info))
2910 return -EINVAL;
2911 if (copy_from_user(&info, optval, optlen))
2912 return -EFAULT;
2913 if (info.sinfo_flags &
2914 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2915 SCTP_ABORT | SCTP_EOF))
2916 return -EINVAL;
2917
2918 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2919 if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
2920 sctp_style(sk, UDP))
2921 return -EINVAL;
2922
2923 if (asoc) {
2924 asoc->default_stream = info.sinfo_stream;
2925 asoc->default_flags = info.sinfo_flags;
2926 asoc->default_ppid = info.sinfo_ppid;
2927 asoc->default_context = info.sinfo_context;
2928 asoc->default_timetolive = info.sinfo_timetolive;
2929
2930 return 0;
2931 }
2932
2933 if (sctp_style(sk, TCP))
2934 info.sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2935
2936 if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2937 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2938 sp->default_stream = info.sinfo_stream;
2939 sp->default_flags = info.sinfo_flags;
2940 sp->default_ppid = info.sinfo_ppid;
2941 sp->default_context = info.sinfo_context;
2942 sp->default_timetolive = info.sinfo_timetolive;
2943 }
2944
2945 if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2946 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2947 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2948 asoc->default_stream = info.sinfo_stream;
2949 asoc->default_flags = info.sinfo_flags;
2950 asoc->default_ppid = info.sinfo_ppid;
2951 asoc->default_context = info.sinfo_context;
2952 asoc->default_timetolive = info.sinfo_timetolive;
2953 }
2954 }
2955
2956 return 0;
2957}
2958
2959/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2960 * (SCTP_DEFAULT_SNDINFO)
2961 */
2962static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2963 char __user *optval,
2964 unsigned int optlen)
2965{
2966 struct sctp_sock *sp = sctp_sk(sk);
2967 struct sctp_association *asoc;
2968 struct sctp_sndinfo info;
2969
2970 if (optlen != sizeof(info))
2971 return -EINVAL;
2972 if (copy_from_user(&info, optval, optlen))
2973 return -EFAULT;
2974 if (info.snd_flags &
2975 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2976 SCTP_ABORT | SCTP_EOF))
2977 return -EINVAL;
2978
2979 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2980 if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
2981 sctp_style(sk, UDP))
2982 return -EINVAL;
2983
2984 if (asoc) {
2985 asoc->default_stream = info.snd_sid;
2986 asoc->default_flags = info.snd_flags;
2987 asoc->default_ppid = info.snd_ppid;
2988 asoc->default_context = info.snd_context;
2989
2990 return 0;
2991 }
2992
2993 if (sctp_style(sk, TCP))
2994 info.snd_assoc_id = SCTP_FUTURE_ASSOC;
2995
2996 if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
2997 info.snd_assoc_id == SCTP_ALL_ASSOC) {
2998 sp->default_stream = info.snd_sid;
2999 sp->default_flags = info.snd_flags;
3000 sp->default_ppid = info.snd_ppid;
3001 sp->default_context = info.snd_context;
3002 }
3003
3004 if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3005 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3006 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3007 asoc->default_stream = info.snd_sid;
3008 asoc->default_flags = info.snd_flags;
3009 asoc->default_ppid = info.snd_ppid;
3010 asoc->default_context = info.snd_context;
3011 }
3012 }
3013
3014 return 0;
3015}
3016
3017/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3018 *
3019 * Requests that the local SCTP stack use the enclosed peer address as
3020 * the association primary. The enclosed address must be one of the
3021 * association peer's addresses.
3022 */
3023static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3024 unsigned int optlen)
3025{
3026 struct sctp_prim prim;
3027 struct sctp_transport *trans;
3028 struct sctp_af *af;
3029 int err;
3030
3031 if (optlen != sizeof(struct sctp_prim))
3032 return -EINVAL;
3033
3034 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3035 return -EFAULT;
3036
3037 /* Allow security module to validate address but need address len. */
3038 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3039 if (!af)
3040 return -EINVAL;
3041
3042 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3043 (struct sockaddr *)&prim.ssp_addr,
3044 af->sockaddr_len);
3045 if (err)
3046 return err;
3047
3048 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3049 if (!trans)
3050 return -EINVAL;
3051
3052 sctp_assoc_set_primary(trans->asoc, trans);
3053
3054 return 0;
3055}
3056
3057/*
3058 * 7.1.5 SCTP_NODELAY
3059 *
3060 * Turn on/off any Nagle-like algorithm. This means that packets are
3061 * generally sent as soon as possible and no unnecessary delays are
3062 * introduced, at the cost of more packets in the network. Expects an
3063 * integer boolean flag.
3064 */
3065static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3066 unsigned int optlen)
3067{
3068 int val;
3069
3070 if (optlen < sizeof(int))
3071 return -EINVAL;
3072 if (get_user(val, (int __user *)optval))
3073 return -EFAULT;
3074
3075 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3076 return 0;
3077}
3078
3079/*
3080 *
3081 * 7.1.1 SCTP_RTOINFO
3082 *
3083 * The protocol parameters used to initialize and bound retransmission
3084 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3085 * and modify these parameters.
3086 * All parameters are time values, in milliseconds. A value of 0, when
3087 * modifying the parameters, indicates that the current value should not
3088 * be changed.
3089 *
3090 */
3091static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3092{
3093 struct sctp_rtoinfo rtoinfo;
3094 struct sctp_association *asoc;
3095 unsigned long rto_min, rto_max;
3096 struct sctp_sock *sp = sctp_sk(sk);
3097
3098 if (optlen != sizeof (struct sctp_rtoinfo))
3099 return -EINVAL;
3100
3101 if (copy_from_user(&rtoinfo, optval, optlen))
3102 return -EFAULT;
3103
3104 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3105
3106 /* Set the values to the specific association */
3107 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3108 sctp_style(sk, UDP))
3109 return -EINVAL;
3110
3111 rto_max = rtoinfo.srto_max;
3112 rto_min = rtoinfo.srto_min;
3113
3114 if (rto_max)
3115 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3116 else
3117 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3118
3119 if (rto_min)
3120 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3121 else
3122 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3123
3124 if (rto_min > rto_max)
3125 return -EINVAL;
3126
3127 if (asoc) {
3128 if (rtoinfo.srto_initial != 0)
3129 asoc->rto_initial =
3130 msecs_to_jiffies(rtoinfo.srto_initial);
3131 asoc->rto_max = rto_max;
3132 asoc->rto_min = rto_min;
3133 } else {
3134 /* If there is no association or the association-id = 0
3135 * set the values to the endpoint.
3136 */
3137 if (rtoinfo.srto_initial != 0)
3138 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3139 sp->rtoinfo.srto_max = rto_max;
3140 sp->rtoinfo.srto_min = rto_min;
3141 }
3142
3143 return 0;
3144}
3145
3146/*
3147 *
3148 * 7.1.2 SCTP_ASSOCINFO
3149 *
3150 * This option is used to tune the maximum retransmission attempts
3151 * of the association.
3152 * Returns an error if the new association retransmission value is
3153 * greater than the sum of the retransmission value of the peer.
3154 * See [SCTP] for more information.
3155 *
3156 */
3157static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3158{
3159
3160 struct sctp_assocparams assocparams;
3161 struct sctp_association *asoc;
3162
3163 if (optlen != sizeof(struct sctp_assocparams))
3164 return -EINVAL;
3165 if (copy_from_user(&assocparams, optval, optlen))
3166 return -EFAULT;
3167
3168 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3169
3170 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3171 sctp_style(sk, UDP))
3172 return -EINVAL;
3173
3174 /* Set the values to the specific association */
3175 if (asoc) {
3176 if (assocparams.sasoc_asocmaxrxt != 0) {
3177 __u32 path_sum = 0;
3178 int paths = 0;
3179 struct sctp_transport *peer_addr;
3180
3181 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3182 transports) {
3183 path_sum += peer_addr->pathmaxrxt;
3184 paths++;
3185 }
3186
3187 /* Only validate asocmaxrxt if we have more than
3188 * one path/transport. We do this because path
3189 * retransmissions are only counted when we have more
3190 * then one path.
3191 */
3192 if (paths > 1 &&
3193 assocparams.sasoc_asocmaxrxt > path_sum)
3194 return -EINVAL;
3195
3196 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3197 }
3198
3199 if (assocparams.sasoc_cookie_life != 0)
3200 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3201 } else {
3202 /* Set the values to the endpoint */
3203 struct sctp_sock *sp = sctp_sk(sk);
3204
3205 if (assocparams.sasoc_asocmaxrxt != 0)
3206 sp->assocparams.sasoc_asocmaxrxt =
3207 assocparams.sasoc_asocmaxrxt;
3208 if (assocparams.sasoc_cookie_life != 0)
3209 sp->assocparams.sasoc_cookie_life =
3210 assocparams.sasoc_cookie_life;
3211 }
3212 return 0;
3213}
3214
3215/*
3216 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3217 *
3218 * This socket option is a boolean flag which turns on or off mapped V4
3219 * addresses. If this option is turned on and the socket is type
3220 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3221 * If this option is turned off, then no mapping will be done of V4
3222 * addresses and a user will receive both PF_INET6 and PF_INET type
3223 * addresses on the socket.
3224 */
3225static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3226{
3227 int val;
3228 struct sctp_sock *sp = sctp_sk(sk);
3229
3230 if (optlen < sizeof(int))
3231 return -EINVAL;
3232 if (get_user(val, (int __user *)optval))
3233 return -EFAULT;
3234 if (val)
3235 sp->v4mapped = 1;
3236 else
3237 sp->v4mapped = 0;
3238
3239 return 0;
3240}
3241
3242/*
3243 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3244 * This option will get or set the maximum size to put in any outgoing
3245 * SCTP DATA chunk. If a message is larger than this size it will be
3246 * fragmented by SCTP into the specified size. Note that the underlying
3247 * SCTP implementation may fragment into smaller sized chunks when the
3248 * PMTU of the underlying association is smaller than the value set by
3249 * the user. The default value for this option is '0' which indicates
3250 * the user is NOT limiting fragmentation and only the PMTU will effect
3251 * SCTP's choice of DATA chunk size. Note also that values set larger
3252 * than the maximum size of an IP datagram will effectively let SCTP
3253 * control fragmentation (i.e. the same as setting this option to 0).
3254 *
3255 * The following structure is used to access and modify this parameter:
3256 *
3257 * struct sctp_assoc_value {
3258 * sctp_assoc_t assoc_id;
3259 * uint32_t assoc_value;
3260 * };
3261 *
3262 * assoc_id: This parameter is ignored for one-to-one style sockets.
3263 * For one-to-many style sockets this parameter indicates which
3264 * association the user is performing an action upon. Note that if
3265 * this field's value is zero then the endpoints default value is
3266 * changed (effecting future associations only).
3267 * assoc_value: This parameter specifies the maximum size in bytes.
3268 */
3269static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3270{
3271 struct sctp_sock *sp = sctp_sk(sk);
3272 struct sctp_assoc_value params;
3273 struct sctp_association *asoc;
3274 int val;
3275
3276 if (optlen == sizeof(int)) {
3277 pr_warn_ratelimited(DEPRECATED
3278 "%s (pid %d) "
3279 "Use of int in maxseg socket option.\n"
3280 "Use struct sctp_assoc_value instead\n",
3281 current->comm, task_pid_nr(current));
3282 if (copy_from_user(&val, optval, optlen))
3283 return -EFAULT;
3284 params.assoc_id = SCTP_FUTURE_ASSOC;
3285 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3286 if (copy_from_user(¶ms, optval, optlen))
3287 return -EFAULT;
3288 val = params.assoc_value;
3289 } else {
3290 return -EINVAL;
3291 }
3292
3293 asoc = sctp_id2assoc(sk, params.assoc_id);
3294 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3295 sctp_style(sk, UDP))
3296 return -EINVAL;
3297
3298 if (val) {
3299 int min_len, max_len;
3300 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3301 sizeof(struct sctp_data_chunk);
3302
3303 min_len = sctp_min_frag_point(sp, datasize);
3304 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3305
3306 if (val < min_len || val > max_len)
3307 return -EINVAL;
3308 }
3309
3310 if (asoc) {
3311 asoc->user_frag = val;
3312 sctp_assoc_update_frag_point(asoc);
3313 } else {
3314 sp->user_frag = val;
3315 }
3316
3317 return 0;
3318}
3319
3320
3321/*
3322 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3323 *
3324 * Requests that the peer mark the enclosed address as the association
3325 * primary. The enclosed address must be one of the association's
3326 * locally bound addresses. The following structure is used to make a
3327 * set primary request:
3328 */
3329static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3330 unsigned int optlen)
3331{
3332 struct sctp_sock *sp;
3333 struct sctp_association *asoc = NULL;
3334 struct sctp_setpeerprim prim;
3335 struct sctp_chunk *chunk;
3336 struct sctp_af *af;
3337 int err;
3338
3339 sp = sctp_sk(sk);
3340
3341 if (!sp->ep->asconf_enable)
3342 return -EPERM;
3343
3344 if (optlen != sizeof(struct sctp_setpeerprim))
3345 return -EINVAL;
3346
3347 if (copy_from_user(&prim, optval, optlen))
3348 return -EFAULT;
3349
3350 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3351 if (!asoc)
3352 return -EINVAL;
3353
3354 if (!asoc->peer.asconf_capable)
3355 return -EPERM;
3356
3357 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3358 return -EPERM;
3359
3360 if (!sctp_state(asoc, ESTABLISHED))
3361 return -ENOTCONN;
3362
3363 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3364 if (!af)
3365 return -EINVAL;
3366
3367 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3368 return -EADDRNOTAVAIL;
3369
3370 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3371 return -EADDRNOTAVAIL;
3372
3373 /* Allow security module to validate address. */
3374 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3375 (struct sockaddr *)&prim.sspp_addr,
3376 af->sockaddr_len);
3377 if (err)
3378 return err;
3379
3380 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3381 chunk = sctp_make_asconf_set_prim(asoc,
3382 (union sctp_addr *)&prim.sspp_addr);
3383 if (!chunk)
3384 return -ENOMEM;
3385
3386 err = sctp_send_asconf(asoc, chunk);
3387
3388 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3389
3390 return err;
3391}
3392
3393static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3394 unsigned int optlen)
3395{
3396 struct sctp_setadaptation adaptation;
3397
3398 if (optlen != sizeof(struct sctp_setadaptation))
3399 return -EINVAL;
3400 if (copy_from_user(&adaptation, optval, optlen))
3401 return -EFAULT;
3402
3403 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3404
3405 return 0;
3406}
3407
3408/*
3409 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3410 *
3411 * The context field in the sctp_sndrcvinfo structure is normally only
3412 * used when a failed message is retrieved holding the value that was
3413 * sent down on the actual send call. This option allows the setting of
3414 * a default context on an association basis that will be received on
3415 * reading messages from the peer. This is especially helpful in the
3416 * one-2-many model for an application to keep some reference to an
3417 * internal state machine that is processing messages on the
3418 * association. Note that the setting of this value only effects
3419 * received messages from the peer and does not effect the value that is
3420 * saved with outbound messages.
3421 */
3422static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3423 unsigned int optlen)
3424{
3425 struct sctp_sock *sp = sctp_sk(sk);
3426 struct sctp_assoc_value params;
3427 struct sctp_association *asoc;
3428
3429 if (optlen != sizeof(struct sctp_assoc_value))
3430 return -EINVAL;
3431 if (copy_from_user(¶ms, optval, optlen))
3432 return -EFAULT;
3433
3434 asoc = sctp_id2assoc(sk, params.assoc_id);
3435 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3436 sctp_style(sk, UDP))
3437 return -EINVAL;
3438
3439 if (asoc) {
3440 asoc->default_rcv_context = params.assoc_value;
3441
3442 return 0;
3443 }
3444
3445 if (sctp_style(sk, TCP))
3446 params.assoc_id = SCTP_FUTURE_ASSOC;
3447
3448 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3449 params.assoc_id == SCTP_ALL_ASSOC)
3450 sp->default_rcv_context = params.assoc_value;
3451
3452 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3453 params.assoc_id == SCTP_ALL_ASSOC)
3454 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3455 asoc->default_rcv_context = params.assoc_value;
3456
3457 return 0;
3458}
3459
3460/*
3461 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3462 *
3463 * This options will at a minimum specify if the implementation is doing
3464 * fragmented interleave. Fragmented interleave, for a one to many
3465 * socket, is when subsequent calls to receive a message may return
3466 * parts of messages from different associations. Some implementations
3467 * may allow you to turn this value on or off. If so, when turned off,
3468 * no fragment interleave will occur (which will cause a head of line
3469 * blocking amongst multiple associations sharing the same one to many
3470 * socket). When this option is turned on, then each receive call may
3471 * come from a different association (thus the user must receive data
3472 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3473 * association each receive belongs to.
3474 *
3475 * This option takes a boolean value. A non-zero value indicates that
3476 * fragmented interleave is on. A value of zero indicates that
3477 * fragmented interleave is off.
3478 *
3479 * Note that it is important that an implementation that allows this
3480 * option to be turned on, have it off by default. Otherwise an unaware
3481 * application using the one to many model may become confused and act
3482 * incorrectly.
3483 */
3484static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3485 char __user *optval,
3486 unsigned int optlen)
3487{
3488 int val;
3489
3490 if (optlen != sizeof(int))
3491 return -EINVAL;
3492 if (get_user(val, (int __user *)optval))
3493 return -EFAULT;
3494
3495 sctp_sk(sk)->frag_interleave = !!val;
3496
3497 if (!sctp_sk(sk)->frag_interleave)
3498 sctp_sk(sk)->ep->intl_enable = 0;
3499
3500 return 0;
3501}
3502
3503/*
3504 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3505 * (SCTP_PARTIAL_DELIVERY_POINT)
3506 *
3507 * This option will set or get the SCTP partial delivery point. This
3508 * point is the size of a message where the partial delivery API will be
3509 * invoked to help free up rwnd space for the peer. Setting this to a
3510 * lower value will cause partial deliveries to happen more often. The
3511 * calls argument is an integer that sets or gets the partial delivery
3512 * point. Note also that the call will fail if the user attempts to set
3513 * this value larger than the socket receive buffer size.
3514 *
3515 * Note that any single message having a length smaller than or equal to
3516 * the SCTP partial delivery point will be delivered in one single read
3517 * call as long as the user provided buffer is large enough to hold the
3518 * message.
3519 */
3520static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3521 char __user *optval,
3522 unsigned int optlen)
3523{
3524 u32 val;
3525
3526 if (optlen != sizeof(u32))
3527 return -EINVAL;
3528 if (get_user(val, (int __user *)optval))
3529 return -EFAULT;
3530
3531 /* Note: We double the receive buffer from what the user sets
3532 * it to be, also initial rwnd is based on rcvbuf/2.
3533 */
3534 if (val > (sk->sk_rcvbuf >> 1))
3535 return -EINVAL;
3536
3537 sctp_sk(sk)->pd_point = val;
3538
3539 return 0; /* is this the right error code? */
3540}
3541
3542/*
3543 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3544 *
3545 * This option will allow a user to change the maximum burst of packets
3546 * that can be emitted by this association. Note that the default value
3547 * is 4, and some implementations may restrict this setting so that it
3548 * can only be lowered.
3549 *
3550 * NOTE: This text doesn't seem right. Do this on a socket basis with
3551 * future associations inheriting the socket value.
3552 */
3553static int sctp_setsockopt_maxburst(struct sock *sk,
3554 char __user *optval,
3555 unsigned int optlen)
3556{
3557 struct sctp_sock *sp = sctp_sk(sk);
3558 struct sctp_assoc_value params;
3559 struct sctp_association *asoc;
3560
3561 if (optlen == sizeof(int)) {
3562 pr_warn_ratelimited(DEPRECATED
3563 "%s (pid %d) "
3564 "Use of int in max_burst socket option deprecated.\n"
3565 "Use struct sctp_assoc_value instead\n",
3566 current->comm, task_pid_nr(current));
3567 if (copy_from_user(¶ms.assoc_value, optval, optlen))
3568 return -EFAULT;
3569 params.assoc_id = SCTP_FUTURE_ASSOC;
3570 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3571 if (copy_from_user(¶ms, optval, optlen))
3572 return -EFAULT;
3573 } else
3574 return -EINVAL;
3575
3576 asoc = sctp_id2assoc(sk, params.assoc_id);
3577 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3578 sctp_style(sk, UDP))
3579 return -EINVAL;
3580
3581 if (asoc) {
3582 asoc->max_burst = params.assoc_value;
3583
3584 return 0;
3585 }
3586
3587 if (sctp_style(sk, TCP))
3588 params.assoc_id = SCTP_FUTURE_ASSOC;
3589
3590 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3591 params.assoc_id == SCTP_ALL_ASSOC)
3592 sp->max_burst = params.assoc_value;
3593
3594 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3595 params.assoc_id == SCTP_ALL_ASSOC)
3596 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3597 asoc->max_burst = params.assoc_value;
3598
3599 return 0;
3600}
3601
3602/*
3603 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3604 *
3605 * This set option adds a chunk type that the user is requesting to be
3606 * received only in an authenticated way. Changes to the list of chunks
3607 * will only effect future associations on the socket.
3608 */
3609static int sctp_setsockopt_auth_chunk(struct sock *sk,
3610 char __user *optval,
3611 unsigned int optlen)
3612{
3613 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3614 struct sctp_authchunk val;
3615
3616 if (!ep->auth_enable)
3617 return -EACCES;
3618
3619 if (optlen != sizeof(struct sctp_authchunk))
3620 return -EINVAL;
3621 if (copy_from_user(&val, optval, optlen))
3622 return -EFAULT;
3623
3624 switch (val.sauth_chunk) {
3625 case SCTP_CID_INIT:
3626 case SCTP_CID_INIT_ACK:
3627 case SCTP_CID_SHUTDOWN_COMPLETE:
3628 case SCTP_CID_AUTH:
3629 return -EINVAL;
3630 }
3631
3632 /* add this chunk id to the endpoint */
3633 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3634}
3635
3636/*
3637 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3638 *
3639 * This option gets or sets the list of HMAC algorithms that the local
3640 * endpoint requires the peer to use.
3641 */
3642static int sctp_setsockopt_hmac_ident(struct sock *sk,
3643 char __user *optval,
3644 unsigned int optlen)
3645{
3646 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3647 struct sctp_hmacalgo *hmacs;
3648 u32 idents;
3649 int err;
3650
3651 if (!ep->auth_enable)
3652 return -EACCES;
3653
3654 if (optlen < sizeof(struct sctp_hmacalgo))
3655 return -EINVAL;
3656 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3657 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3658
3659 hmacs = memdup_user(optval, optlen);
3660 if (IS_ERR(hmacs))
3661 return PTR_ERR(hmacs);
3662
3663 idents = hmacs->shmac_num_idents;
3664 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3665 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3666 err = -EINVAL;
3667 goto out;
3668 }
3669
3670 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3671out:
3672 kfree(hmacs);
3673 return err;
3674}
3675
3676/*
3677 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3678 *
3679 * This option will set a shared secret key which is used to build an
3680 * association shared key.
3681 */
3682static int sctp_setsockopt_auth_key(struct sock *sk,
3683 char __user *optval,
3684 unsigned int optlen)
3685{
3686 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3687 struct sctp_authkey *authkey;
3688 struct sctp_association *asoc;
3689 int ret = -EINVAL;
3690
3691 if (optlen <= sizeof(struct sctp_authkey))
3692 return -EINVAL;
3693 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3694 * this.
3695 */
3696 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3697
3698 authkey = memdup_user(optval, optlen);
3699 if (IS_ERR(authkey))
3700 return PTR_ERR(authkey);
3701
3702 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3703 goto out;
3704
3705 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3706 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3707 sctp_style(sk, UDP))
3708 goto out;
3709
3710 if (asoc) {
3711 ret = sctp_auth_set_key(ep, asoc, authkey);
3712 goto out;
3713 }
3714
3715 if (sctp_style(sk, TCP))
3716 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3717
3718 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3719 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3720 ret = sctp_auth_set_key(ep, asoc, authkey);
3721 if (ret)
3722 goto out;
3723 }
3724
3725 ret = 0;
3726
3727 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3728 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3729 list_for_each_entry(asoc, &ep->asocs, asocs) {
3730 int res = sctp_auth_set_key(ep, asoc, authkey);
3731
3732 if (res && !ret)
3733 ret = res;
3734 }
3735 }
3736
3737out:
3738 kzfree(authkey);
3739 return ret;
3740}
3741
3742/*
3743 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3744 *
3745 * This option will get or set the active shared key to be used to build
3746 * the association shared key.
3747 */
3748static int sctp_setsockopt_active_key(struct sock *sk,
3749 char __user *optval,
3750 unsigned int optlen)
3751{
3752 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3753 struct sctp_association *asoc;
3754 struct sctp_authkeyid val;
3755 int ret = 0;
3756
3757 if (optlen != sizeof(struct sctp_authkeyid))
3758 return -EINVAL;
3759 if (copy_from_user(&val, optval, optlen))
3760 return -EFAULT;
3761
3762 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3763 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3764 sctp_style(sk, UDP))
3765 return -EINVAL;
3766
3767 if (asoc)
3768 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3769
3770 if (sctp_style(sk, TCP))
3771 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3772
3773 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3774 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3775 ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3776 if (ret)
3777 return ret;
3778 }
3779
3780 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3781 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3782 list_for_each_entry(asoc, &ep->asocs, asocs) {
3783 int res = sctp_auth_set_active_key(ep, asoc,
3784 val.scact_keynumber);
3785
3786 if (res && !ret)
3787 ret = res;
3788 }
3789 }
3790
3791 return ret;
3792}
3793
3794/*
3795 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3796 *
3797 * This set option will delete a shared secret key from use.
3798 */
3799static int sctp_setsockopt_del_key(struct sock *sk,
3800 char __user *optval,
3801 unsigned int optlen)
3802{
3803 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3804 struct sctp_association *asoc;
3805 struct sctp_authkeyid val;
3806 int ret = 0;
3807
3808 if (optlen != sizeof(struct sctp_authkeyid))
3809 return -EINVAL;
3810 if (copy_from_user(&val, optval, optlen))
3811 return -EFAULT;
3812
3813 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3814 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3815 sctp_style(sk, UDP))
3816 return -EINVAL;
3817
3818 if (asoc)
3819 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3820
3821 if (sctp_style(sk, TCP))
3822 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3823
3824 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3825 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3826 ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3827 if (ret)
3828 return ret;
3829 }
3830
3831 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3832 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3833 list_for_each_entry(asoc, &ep->asocs, asocs) {
3834 int res = sctp_auth_del_key_id(ep, asoc,
3835 val.scact_keynumber);
3836
3837 if (res && !ret)
3838 ret = res;
3839 }
3840 }
3841
3842 return ret;
3843}
3844
3845/*
3846 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3847 *
3848 * This set option will deactivate a shared secret key.
3849 */
3850static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3851 unsigned int optlen)
3852{
3853 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3854 struct sctp_association *asoc;
3855 struct sctp_authkeyid val;
3856 int ret = 0;
3857
3858 if (optlen != sizeof(struct sctp_authkeyid))
3859 return -EINVAL;
3860 if (copy_from_user(&val, optval, optlen))
3861 return -EFAULT;
3862
3863 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3864 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3865 sctp_style(sk, UDP))
3866 return -EINVAL;
3867
3868 if (asoc)
3869 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3870
3871 if (sctp_style(sk, TCP))
3872 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3873
3874 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3875 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3876 ret = sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3877 if (ret)
3878 return ret;
3879 }
3880
3881 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3882 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3883 list_for_each_entry(asoc, &ep->asocs, asocs) {
3884 int res = sctp_auth_deact_key_id(ep, asoc,
3885 val.scact_keynumber);
3886
3887 if (res && !ret)
3888 ret = res;
3889 }
3890 }
3891
3892 return ret;
3893}
3894
3895/*
3896 * 8.1.23 SCTP_AUTO_ASCONF
3897 *
3898 * This option will enable or disable the use of the automatic generation of
3899 * ASCONF chunks to add and delete addresses to an existing association. Note
3900 * that this option has two caveats namely: a) it only affects sockets that
3901 * are bound to all addresses available to the SCTP stack, and b) the system
3902 * administrator may have an overriding control that turns the ASCONF feature
3903 * off no matter what setting the socket option may have.
3904 * This option expects an integer boolean flag, where a non-zero value turns on
3905 * the option, and a zero value turns off the option.
3906 * Note. In this implementation, socket operation overrides default parameter
3907 * being set by sysctl as well as FreeBSD implementation
3908 */
3909static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3910 unsigned int optlen)
3911{
3912 int val;
3913 struct sctp_sock *sp = sctp_sk(sk);
3914
3915 if (optlen < sizeof(int))
3916 return -EINVAL;
3917 if (get_user(val, (int __user *)optval))
3918 return -EFAULT;
3919 if (!sctp_is_ep_boundall(sk) && val)
3920 return -EINVAL;
3921 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3922 return 0;
3923
3924 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3925 if (val == 0 && sp->do_auto_asconf) {
3926 list_del(&sp->auto_asconf_list);
3927 sp->do_auto_asconf = 0;
3928 } else if (val && !sp->do_auto_asconf) {
3929 list_add_tail(&sp->auto_asconf_list,
3930 &sock_net(sk)->sctp.auto_asconf_splist);
3931 sp->do_auto_asconf = 1;
3932 }
3933 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3934 return 0;
3935}
3936
3937/*
3938 * SCTP_PEER_ADDR_THLDS
3939 *
3940 * This option allows us to alter the partially failed threshold for one or all
3941 * transports in an association. See Section 6.1 of:
3942 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3943 */
3944static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3945 char __user *optval,
3946 unsigned int optlen)
3947{
3948 struct sctp_paddrthlds val;
3949 struct sctp_transport *trans;
3950 struct sctp_association *asoc;
3951
3952 if (optlen < sizeof(struct sctp_paddrthlds))
3953 return -EINVAL;
3954 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3955 sizeof(struct sctp_paddrthlds)))
3956 return -EFAULT;
3957
3958 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3959 trans = sctp_addr_id2transport(sk, &val.spt_address,
3960 val.spt_assoc_id);
3961 if (!trans)
3962 return -ENOENT;
3963
3964 if (val.spt_pathmaxrxt)
3965 trans->pathmaxrxt = val.spt_pathmaxrxt;
3966 trans->pf_retrans = val.spt_pathpfthld;
3967
3968 return 0;
3969 }
3970
3971 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3972 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
3973 sctp_style(sk, UDP))
3974 return -EINVAL;
3975
3976 if (asoc) {
3977 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3978 transports) {
3979 if (val.spt_pathmaxrxt)
3980 trans->pathmaxrxt = val.spt_pathmaxrxt;
3981 trans->pf_retrans = val.spt_pathpfthld;
3982 }
3983
3984 if (val.spt_pathmaxrxt)
3985 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3986 asoc->pf_retrans = val.spt_pathpfthld;
3987 } else {
3988 struct sctp_sock *sp = sctp_sk(sk);
3989
3990 if (val.spt_pathmaxrxt)
3991 sp->pathmaxrxt = val.spt_pathmaxrxt;
3992 sp->pf_retrans = val.spt_pathpfthld;
3993 }
3994
3995 return 0;
3996}
3997
3998static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3999 char __user *optval,
4000 unsigned int optlen)
4001{
4002 int val;
4003
4004 if (optlen < sizeof(int))
4005 return -EINVAL;
4006 if (get_user(val, (int __user *) optval))
4007 return -EFAULT;
4008
4009 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4010
4011 return 0;
4012}
4013
4014static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4015 char __user *optval,
4016 unsigned int optlen)
4017{
4018 int val;
4019
4020 if (optlen < sizeof(int))
4021 return -EINVAL;
4022 if (get_user(val, (int __user *) optval))
4023 return -EFAULT;
4024
4025 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4026
4027 return 0;
4028}
4029
4030static int sctp_setsockopt_pr_supported(struct sock *sk,
4031 char __user *optval,
4032 unsigned int optlen)
4033{
4034 struct sctp_assoc_value params;
4035 struct sctp_association *asoc;
4036
4037 if (optlen != sizeof(params))
4038 return -EINVAL;
4039
4040 if (copy_from_user(¶ms, optval, optlen))
4041 return -EFAULT;
4042
4043 asoc = sctp_id2assoc(sk, params.assoc_id);
4044 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4045 sctp_style(sk, UDP))
4046 return -EINVAL;
4047
4048 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4049
4050 return 0;
4051}
4052
4053static int sctp_setsockopt_default_prinfo(struct sock *sk,
4054 char __user *optval,
4055 unsigned int optlen)
4056{
4057 struct sctp_sock *sp = sctp_sk(sk);
4058 struct sctp_default_prinfo info;
4059 struct sctp_association *asoc;
4060 int retval = -EINVAL;
4061
4062 if (optlen != sizeof(info))
4063 goto out;
4064
4065 if (copy_from_user(&info, optval, sizeof(info))) {
4066 retval = -EFAULT;
4067 goto out;
4068 }
4069
4070 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4071 goto out;
4072
4073 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4074 info.pr_value = 0;
4075
4076 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4077 if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4078 sctp_style(sk, UDP))
4079 goto out;
4080
4081 retval = 0;
4082
4083 if (asoc) {
4084 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4085 asoc->default_timetolive = info.pr_value;
4086 goto out;
4087 }
4088
4089 if (sctp_style(sk, TCP))
4090 info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4091
4092 if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4093 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4094 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4095 sp->default_timetolive = info.pr_value;
4096 }
4097
4098 if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4099 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4100 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4101 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4102 asoc->default_timetolive = info.pr_value;
4103 }
4104 }
4105
4106out:
4107 return retval;
4108}
4109
4110static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4111 char __user *optval,
4112 unsigned int optlen)
4113{
4114 struct sctp_assoc_value params;
4115 struct sctp_association *asoc;
4116 int retval = -EINVAL;
4117
4118 if (optlen != sizeof(params))
4119 goto out;
4120
4121 if (copy_from_user(¶ms, optval, optlen)) {
4122 retval = -EFAULT;
4123 goto out;
4124 }
4125
4126 asoc = sctp_id2assoc(sk, params.assoc_id);
4127 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4128 sctp_style(sk, UDP))
4129 goto out;
4130
4131 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4132
4133 retval = 0;
4134
4135out:
4136 return retval;
4137}
4138
4139static int sctp_setsockopt_enable_strreset(struct sock *sk,
4140 char __user *optval,
4141 unsigned int optlen)
4142{
4143 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4144 struct sctp_assoc_value params;
4145 struct sctp_association *asoc;
4146 int retval = -EINVAL;
4147
4148 if (optlen != sizeof(params))
4149 goto out;
4150
4151 if (copy_from_user(¶ms, optval, optlen)) {
4152 retval = -EFAULT;
4153 goto out;
4154 }
4155
4156 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4157 goto out;
4158
4159 asoc = sctp_id2assoc(sk, params.assoc_id);
4160 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4161 sctp_style(sk, UDP))
4162 goto out;
4163
4164 retval = 0;
4165
4166 if (asoc) {
4167 asoc->strreset_enable = params.assoc_value;
4168 goto out;
4169 }
4170
4171 if (sctp_style(sk, TCP))
4172 params.assoc_id = SCTP_FUTURE_ASSOC;
4173
4174 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4175 params.assoc_id == SCTP_ALL_ASSOC)
4176 ep->strreset_enable = params.assoc_value;
4177
4178 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4179 params.assoc_id == SCTP_ALL_ASSOC)
4180 list_for_each_entry(asoc, &ep->asocs, asocs)
4181 asoc->strreset_enable = params.assoc_value;
4182
4183out:
4184 return retval;
4185}
4186
4187static int sctp_setsockopt_reset_streams(struct sock *sk,
4188 char __user *optval,
4189 unsigned int optlen)
4190{
4191 struct sctp_reset_streams *params;
4192 struct sctp_association *asoc;
4193 int retval = -EINVAL;
4194
4195 if (optlen < sizeof(*params))
4196 return -EINVAL;
4197 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4198 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4199 sizeof(__u16) * sizeof(*params));
4200
4201 params = memdup_user(optval, optlen);
4202 if (IS_ERR(params))
4203 return PTR_ERR(params);
4204
4205 if (params->srs_number_streams * sizeof(__u16) >
4206 optlen - sizeof(*params))
4207 goto out;
4208
4209 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4210 if (!asoc)
4211 goto out;
4212
4213 retval = sctp_send_reset_streams(asoc, params);
4214
4215out:
4216 kfree(params);
4217 return retval;
4218}
4219
4220static int sctp_setsockopt_reset_assoc(struct sock *sk,
4221 char __user *optval,
4222 unsigned int optlen)
4223{
4224 struct sctp_association *asoc;
4225 sctp_assoc_t associd;
4226 int retval = -EINVAL;
4227
4228 if (optlen != sizeof(associd))
4229 goto out;
4230
4231 if (copy_from_user(&associd, optval, optlen)) {
4232 retval = -EFAULT;
4233 goto out;
4234 }
4235
4236 asoc = sctp_id2assoc(sk, associd);
4237 if (!asoc)
4238 goto out;
4239
4240 retval = sctp_send_reset_assoc(asoc);
4241
4242out:
4243 return retval;
4244}
4245
4246static int sctp_setsockopt_add_streams(struct sock *sk,
4247 char __user *optval,
4248 unsigned int optlen)
4249{
4250 struct sctp_association *asoc;
4251 struct sctp_add_streams params;
4252 int retval = -EINVAL;
4253
4254 if (optlen != sizeof(params))
4255 goto out;
4256
4257 if (copy_from_user(¶ms, optval, optlen)) {
4258 retval = -EFAULT;
4259 goto out;
4260 }
4261
4262 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4263 if (!asoc)
4264 goto out;
4265
4266 retval = sctp_send_add_streams(asoc, ¶ms);
4267
4268out:
4269 return retval;
4270}
4271
4272static int sctp_setsockopt_scheduler(struct sock *sk,
4273 char __user *optval,
4274 unsigned int optlen)
4275{
4276 struct sctp_sock *sp = sctp_sk(sk);
4277 struct sctp_association *asoc;
4278 struct sctp_assoc_value params;
4279 int retval = 0;
4280
4281 if (optlen < sizeof(params))
4282 return -EINVAL;
4283
4284 optlen = sizeof(params);
4285 if (copy_from_user(¶ms, optval, optlen))
4286 return -EFAULT;
4287
4288 if (params.assoc_value > SCTP_SS_MAX)
4289 return -EINVAL;
4290
4291 asoc = sctp_id2assoc(sk, params.assoc_id);
4292 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4293 sctp_style(sk, UDP))
4294 return -EINVAL;
4295
4296 if (asoc)
4297 return sctp_sched_set_sched(asoc, params.assoc_value);
4298
4299 if (sctp_style(sk, TCP))
4300 params.assoc_id = SCTP_FUTURE_ASSOC;
4301
4302 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4303 params.assoc_id == SCTP_ALL_ASSOC)
4304 sp->default_ss = params.assoc_value;
4305
4306 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4307 params.assoc_id == SCTP_ALL_ASSOC) {
4308 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4309 int ret = sctp_sched_set_sched(asoc,
4310 params.assoc_value);
4311
4312 if (ret && !retval)
4313 retval = ret;
4314 }
4315 }
4316
4317 return retval;
4318}
4319
4320static int sctp_setsockopt_scheduler_value(struct sock *sk,
4321 char __user *optval,
4322 unsigned int optlen)
4323{
4324 struct sctp_stream_value params;
4325 struct sctp_association *asoc;
4326 int retval = -EINVAL;
4327
4328 if (optlen < sizeof(params))
4329 goto out;
4330
4331 optlen = sizeof(params);
4332 if (copy_from_user(¶ms, optval, optlen)) {
4333 retval = -EFAULT;
4334 goto out;
4335 }
4336
4337 asoc = sctp_id2assoc(sk, params.assoc_id);
4338 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4339 sctp_style(sk, UDP))
4340 goto out;
4341
4342 if (asoc) {
4343 retval = sctp_sched_set_value(asoc, params.stream_id,
4344 params.stream_value, GFP_KERNEL);
4345 goto out;
4346 }
4347
4348 retval = 0;
4349
4350 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4351 int ret = sctp_sched_set_value(asoc, params.stream_id,
4352 params.stream_value, GFP_KERNEL);
4353 if (ret && !retval) /* try to return the 1st error. */
4354 retval = ret;
4355 }
4356
4357out:
4358 return retval;
4359}
4360
4361static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4362 char __user *optval,
4363 unsigned int optlen)
4364{
4365 struct sctp_sock *sp = sctp_sk(sk);
4366 struct sctp_assoc_value params;
4367 struct sctp_association *asoc;
4368 int retval = -EINVAL;
4369
4370 if (optlen < sizeof(params))
4371 goto out;
4372
4373 optlen = sizeof(params);
4374 if (copy_from_user(¶ms, optval, optlen)) {
4375 retval = -EFAULT;
4376 goto out;
4377 }
4378
4379 asoc = sctp_id2assoc(sk, params.assoc_id);
4380 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4381 sctp_style(sk, UDP))
4382 goto out;
4383
4384 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4385 retval = -EPERM;
4386 goto out;
4387 }
4388
4389 sp->ep->intl_enable = !!params.assoc_value;
4390
4391 retval = 0;
4392
4393out:
4394 return retval;
4395}
4396
4397static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4398 unsigned int optlen)
4399{
4400 int val;
4401
4402 if (!sctp_style(sk, TCP))
4403 return -EOPNOTSUPP;
4404
4405 if (sctp_sk(sk)->ep->base.bind_addr.port)
4406 return -EFAULT;
4407
4408 if (optlen < sizeof(int))
4409 return -EINVAL;
4410
4411 if (get_user(val, (int __user *)optval))
4412 return -EFAULT;
4413
4414 sctp_sk(sk)->reuse = !!val;
4415
4416 return 0;
4417}
4418
4419static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4420 struct sctp_association *asoc)
4421{
4422 struct sctp_ulpevent *event;
4423
4424 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4425
4426 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4427 if (sctp_outq_is_empty(&asoc->outqueue)) {
4428 event = sctp_ulpevent_make_sender_dry_event(asoc,
4429 GFP_USER | __GFP_NOWARN);
4430 if (!event)
4431 return -ENOMEM;
4432
4433 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4434 }
4435 }
4436
4437 return 0;
4438}
4439
4440static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4441 unsigned int optlen)
4442{
4443 struct sctp_sock *sp = sctp_sk(sk);
4444 struct sctp_association *asoc;
4445 struct sctp_event param;
4446 int retval = 0;
4447
4448 if (optlen < sizeof(param))
4449 return -EINVAL;
4450
4451 optlen = sizeof(param);
4452 if (copy_from_user(¶m, optval, optlen))
4453 return -EFAULT;
4454
4455 if (param.se_type < SCTP_SN_TYPE_BASE ||
4456 param.se_type > SCTP_SN_TYPE_MAX)
4457 return -EINVAL;
4458
4459 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4460 if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4461 sctp_style(sk, UDP))
4462 return -EINVAL;
4463
4464 if (asoc)
4465 return sctp_assoc_ulpevent_type_set(¶m, asoc);
4466
4467 if (sctp_style(sk, TCP))
4468 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4469
4470 if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4471 param.se_assoc_id == SCTP_ALL_ASSOC)
4472 sctp_ulpevent_type_set(&sp->subscribe,
4473 param.se_type, param.se_on);
4474
4475 if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4476 param.se_assoc_id == SCTP_ALL_ASSOC) {
4477 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4478 int ret = sctp_assoc_ulpevent_type_set(¶m, asoc);
4479
4480 if (ret && !retval)
4481 retval = ret;
4482 }
4483 }
4484
4485 return retval;
4486}
4487
4488static int sctp_setsockopt_asconf_supported(struct sock *sk,
4489 char __user *optval,
4490 unsigned int optlen)
4491{
4492 struct sctp_assoc_value params;
4493 struct sctp_association *asoc;
4494 struct sctp_endpoint *ep;
4495 int retval = -EINVAL;
4496
4497 if (optlen != sizeof(params))
4498 goto out;
4499
4500 if (copy_from_user(¶ms, optval, optlen)) {
4501 retval = -EFAULT;
4502 goto out;
4503 }
4504
4505 asoc = sctp_id2assoc(sk, params.assoc_id);
4506 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4507 sctp_style(sk, UDP))
4508 goto out;
4509
4510 ep = sctp_sk(sk)->ep;
4511 ep->asconf_enable = !!params.assoc_value;
4512
4513 if (ep->asconf_enable && ep->auth_enable) {
4514 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4515 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4516 }
4517
4518 retval = 0;
4519
4520out:
4521 return retval;
4522}
4523
4524static int sctp_setsockopt_auth_supported(struct sock *sk,
4525 char __user *optval,
4526 unsigned int optlen)
4527{
4528 struct sctp_assoc_value params;
4529 struct sctp_association *asoc;
4530 struct sctp_endpoint *ep;
4531 int retval = -EINVAL;
4532
4533 if (optlen != sizeof(params))
4534 goto out;
4535
4536 if (copy_from_user(¶ms, optval, optlen)) {
4537 retval = -EFAULT;
4538 goto out;
4539 }
4540
4541 asoc = sctp_id2assoc(sk, params.assoc_id);
4542 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4543 sctp_style(sk, UDP))
4544 goto out;
4545
4546 ep = sctp_sk(sk)->ep;
4547 if (params.assoc_value) {
4548 retval = sctp_auth_init(ep, GFP_KERNEL);
4549 if (retval)
4550 goto out;
4551 if (ep->asconf_enable) {
4552 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4553 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4554 }
4555 }
4556
4557 ep->auth_enable = !!params.assoc_value;
4558 retval = 0;
4559
4560out:
4561 return retval;
4562}
4563
4564static int sctp_setsockopt_ecn_supported(struct sock *sk,
4565 char __user *optval,
4566 unsigned int optlen)
4567{
4568 struct sctp_assoc_value params;
4569 struct sctp_association *asoc;
4570 int retval = -EINVAL;
4571
4572 if (optlen != sizeof(params))
4573 goto out;
4574
4575 if (copy_from_user(¶ms, optval, optlen)) {
4576 retval = -EFAULT;
4577 goto out;
4578 }
4579
4580 asoc = sctp_id2assoc(sk, params.assoc_id);
4581 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4582 sctp_style(sk, UDP))
4583 goto out;
4584
4585 sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
4586 retval = 0;
4587
4588out:
4589 return retval;
4590}
4591
4592/* API 6.2 setsockopt(), getsockopt()
4593 *
4594 * Applications use setsockopt() and getsockopt() to set or retrieve
4595 * socket options. Socket options are used to change the default
4596 * behavior of sockets calls. They are described in Section 7.
4597 *
4598 * The syntax is:
4599 *
4600 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4601 * int __user *optlen);
4602 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4603 * int optlen);
4604 *
4605 * sd - the socket descript.
4606 * level - set to IPPROTO_SCTP for all SCTP options.
4607 * optname - the option name.
4608 * optval - the buffer to store the value of the option.
4609 * optlen - the size of the buffer.
4610 */
4611static int sctp_setsockopt(struct sock *sk, int level, int optname,
4612 char __user *optval, unsigned int optlen)
4613{
4614 int retval = 0;
4615
4616 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4617
4618 /* I can hardly begin to describe how wrong this is. This is
4619 * so broken as to be worse than useless. The API draft
4620 * REALLY is NOT helpful here... I am not convinced that the
4621 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4622 * are at all well-founded.
4623 */
4624 if (level != SOL_SCTP) {
4625 struct sctp_af *af = sctp_sk(sk)->pf->af;
4626 retval = af->setsockopt(sk, level, optname, optval, optlen);
4627 goto out_nounlock;
4628 }
4629
4630 lock_sock(sk);
4631
4632 switch (optname) {
4633 case SCTP_SOCKOPT_BINDX_ADD:
4634 /* 'optlen' is the size of the addresses buffer. */
4635 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4636 optlen, SCTP_BINDX_ADD_ADDR);
4637 break;
4638
4639 case SCTP_SOCKOPT_BINDX_REM:
4640 /* 'optlen' is the size of the addresses buffer. */
4641 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4642 optlen, SCTP_BINDX_REM_ADDR);
4643 break;
4644
4645 case SCTP_SOCKOPT_CONNECTX_OLD:
4646 /* 'optlen' is the size of the addresses buffer. */
4647 retval = sctp_setsockopt_connectx_old(sk,
4648 (struct sockaddr __user *)optval,
4649 optlen);
4650 break;
4651
4652 case SCTP_SOCKOPT_CONNECTX:
4653 /* 'optlen' is the size of the addresses buffer. */
4654 retval = sctp_setsockopt_connectx(sk,
4655 (struct sockaddr __user *)optval,
4656 optlen);
4657 break;
4658
4659 case SCTP_DISABLE_FRAGMENTS:
4660 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4661 break;
4662
4663 case SCTP_EVENTS:
4664 retval = sctp_setsockopt_events(sk, optval, optlen);
4665 break;
4666
4667 case SCTP_AUTOCLOSE:
4668 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4669 break;
4670
4671 case SCTP_PEER_ADDR_PARAMS:
4672 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4673 break;
4674
4675 case SCTP_DELAYED_SACK:
4676 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4677 break;
4678 case SCTP_PARTIAL_DELIVERY_POINT:
4679 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4680 break;
4681
4682 case SCTP_INITMSG:
4683 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4684 break;
4685 case SCTP_DEFAULT_SEND_PARAM:
4686 retval = sctp_setsockopt_default_send_param(sk, optval,
4687 optlen);
4688 break;
4689 case SCTP_DEFAULT_SNDINFO:
4690 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4691 break;
4692 case SCTP_PRIMARY_ADDR:
4693 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4694 break;
4695 case SCTP_SET_PEER_PRIMARY_ADDR:
4696 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4697 break;
4698 case SCTP_NODELAY:
4699 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4700 break;
4701 case SCTP_RTOINFO:
4702 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4703 break;
4704 case SCTP_ASSOCINFO:
4705 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4706 break;
4707 case SCTP_I_WANT_MAPPED_V4_ADDR:
4708 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4709 break;
4710 case SCTP_MAXSEG:
4711 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4712 break;
4713 case SCTP_ADAPTATION_LAYER:
4714 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4715 break;
4716 case SCTP_CONTEXT:
4717 retval = sctp_setsockopt_context(sk, optval, optlen);
4718 break;
4719 case SCTP_FRAGMENT_INTERLEAVE:
4720 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4721 break;
4722 case SCTP_MAX_BURST:
4723 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4724 break;
4725 case SCTP_AUTH_CHUNK:
4726 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4727 break;
4728 case SCTP_HMAC_IDENT:
4729 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4730 break;
4731 case SCTP_AUTH_KEY:
4732 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4733 break;
4734 case SCTP_AUTH_ACTIVE_KEY:
4735 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4736 break;
4737 case SCTP_AUTH_DELETE_KEY:
4738 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4739 break;
4740 case SCTP_AUTH_DEACTIVATE_KEY:
4741 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4742 break;
4743 case SCTP_AUTO_ASCONF:
4744 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4745 break;
4746 case SCTP_PEER_ADDR_THLDS:
4747 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4748 break;
4749 case SCTP_RECVRCVINFO:
4750 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4751 break;
4752 case SCTP_RECVNXTINFO:
4753 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4754 break;
4755 case SCTP_PR_SUPPORTED:
4756 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4757 break;
4758 case SCTP_DEFAULT_PRINFO:
4759 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4760 break;
4761 case SCTP_RECONFIG_SUPPORTED:
4762 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4763 break;
4764 case SCTP_ENABLE_STREAM_RESET:
4765 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4766 break;
4767 case SCTP_RESET_STREAMS:
4768 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4769 break;
4770 case SCTP_RESET_ASSOC:
4771 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4772 break;
4773 case SCTP_ADD_STREAMS:
4774 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4775 break;
4776 case SCTP_STREAM_SCHEDULER:
4777 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4778 break;
4779 case SCTP_STREAM_SCHEDULER_VALUE:
4780 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4781 break;
4782 case SCTP_INTERLEAVING_SUPPORTED:
4783 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4784 optlen);
4785 break;
4786 case SCTP_REUSE_PORT:
4787 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4788 break;
4789 case SCTP_EVENT:
4790 retval = sctp_setsockopt_event(sk, optval, optlen);
4791 break;
4792 case SCTP_ASCONF_SUPPORTED:
4793 retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
4794 break;
4795 case SCTP_AUTH_SUPPORTED:
4796 retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
4797 break;
4798 case SCTP_ECN_SUPPORTED:
4799 retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
4800 break;
4801 default:
4802 retval = -ENOPROTOOPT;
4803 break;
4804 }
4805
4806 release_sock(sk);
4807
4808out_nounlock:
4809 return retval;
4810}
4811
4812/* API 3.1.6 connect() - UDP Style Syntax
4813 *
4814 * An application may use the connect() call in the UDP model to initiate an
4815 * association without sending data.
4816 *
4817 * The syntax is:
4818 *
4819 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4820 *
4821 * sd: the socket descriptor to have a new association added to.
4822 *
4823 * nam: the address structure (either struct sockaddr_in or struct
4824 * sockaddr_in6 defined in RFC2553 [7]).
4825 *
4826 * len: the size of the address.
4827 */
4828static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4829 int addr_len, int flags)
4830{
4831 struct sctp_af *af;
4832 int err = -EINVAL;
4833
4834 lock_sock(sk);
4835 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4836 addr, addr_len);
4837
4838 /* Validate addr_len before calling common connect/connectx routine. */
4839 af = sctp_get_af_specific(addr->sa_family);
4840 if (af && addr_len >= af->sockaddr_len)
4841 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4842
4843 release_sock(sk);
4844 return err;
4845}
4846
4847int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4848 int addr_len, int flags)
4849{
4850 if (addr_len < sizeof(uaddr->sa_family))
4851 return -EINVAL;
4852
4853 if (uaddr->sa_family == AF_UNSPEC)
4854 return -EOPNOTSUPP;
4855
4856 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4857}
4858
4859/* FIXME: Write comments. */
4860static int sctp_disconnect(struct sock *sk, int flags)
4861{
4862 return -EOPNOTSUPP; /* STUB */
4863}
4864
4865/* 4.1.4 accept() - TCP Style Syntax
4866 *
4867 * Applications use accept() call to remove an established SCTP
4868 * association from the accept queue of the endpoint. A new socket
4869 * descriptor will be returned from accept() to represent the newly
4870 * formed association.
4871 */
4872static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4873{
4874 struct sctp_sock *sp;
4875 struct sctp_endpoint *ep;
4876 struct sock *newsk = NULL;
4877 struct sctp_association *asoc;
4878 long timeo;
4879 int error = 0;
4880
4881 lock_sock(sk);
4882
4883 sp = sctp_sk(sk);
4884 ep = sp->ep;
4885
4886 if (!sctp_style(sk, TCP)) {
4887 error = -EOPNOTSUPP;
4888 goto out;
4889 }
4890
4891 if (!sctp_sstate(sk, LISTENING)) {
4892 error = -EINVAL;
4893 goto out;
4894 }
4895
4896 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4897
4898 error = sctp_wait_for_accept(sk, timeo);
4899 if (error)
4900 goto out;
4901
4902 /* We treat the list of associations on the endpoint as the accept
4903 * queue and pick the first association on the list.
4904 */
4905 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4906
4907 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4908 if (!newsk) {
4909 error = -ENOMEM;
4910 goto out;
4911 }
4912
4913 /* Populate the fields of the newsk from the oldsk and migrate the
4914 * asoc to the newsk.
4915 */
4916 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4917 if (error) {
4918 sk_common_release(newsk);
4919 newsk = NULL;
4920 }
4921
4922out:
4923 release_sock(sk);
4924 *err = error;
4925 return newsk;
4926}
4927
4928/* The SCTP ioctl handler. */
4929static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4930{
4931 int rc = -ENOTCONN;
4932
4933 lock_sock(sk);
4934
4935 /*
4936 * SEQPACKET-style sockets in LISTENING state are valid, for
4937 * SCTP, so only discard TCP-style sockets in LISTENING state.
4938 */
4939 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4940 goto out;
4941
4942 switch (cmd) {
4943 case SIOCINQ: {
4944 struct sk_buff *skb;
4945 unsigned int amount = 0;
4946
4947 skb = skb_peek(&sk->sk_receive_queue);
4948 if (skb != NULL) {
4949 /*
4950 * We will only return the amount of this packet since
4951 * that is all that will be read.
4952 */
4953 amount = skb->len;
4954 }
4955 rc = put_user(amount, (int __user *)arg);
4956 break;
4957 }
4958 default:
4959 rc = -ENOIOCTLCMD;
4960 break;
4961 }
4962out:
4963 release_sock(sk);
4964 return rc;
4965}
4966
4967/* This is the function which gets called during socket creation to
4968 * initialized the SCTP-specific portion of the sock.
4969 * The sock structure should already be zero-filled memory.
4970 */
4971static int sctp_init_sock(struct sock *sk)
4972{
4973 struct net *net = sock_net(sk);
4974 struct sctp_sock *sp;
4975
4976 pr_debug("%s: sk:%p\n", __func__, sk);
4977
4978 sp = sctp_sk(sk);
4979
4980 /* Initialize the SCTP per socket area. */
4981 switch (sk->sk_type) {
4982 case SOCK_SEQPACKET:
4983 sp->type = SCTP_SOCKET_UDP;
4984 break;
4985 case SOCK_STREAM:
4986 sp->type = SCTP_SOCKET_TCP;
4987 break;
4988 default:
4989 return -ESOCKTNOSUPPORT;
4990 }
4991
4992 sk->sk_gso_type = SKB_GSO_SCTP;
4993
4994 /* Initialize default send parameters. These parameters can be
4995 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4996 */
4997 sp->default_stream = 0;
4998 sp->default_ppid = 0;
4999 sp->default_flags = 0;
5000 sp->default_context = 0;
5001 sp->default_timetolive = 0;
5002
5003 sp->default_rcv_context = 0;
5004 sp->max_burst = net->sctp.max_burst;
5005
5006 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5007
5008 /* Initialize default setup parameters. These parameters
5009 * can be modified with the SCTP_INITMSG socket option or
5010 * overridden by the SCTP_INIT CMSG.
5011 */
5012 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
5013 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
5014 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
5015 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5016
5017 /* Initialize default RTO related parameters. These parameters can
5018 * be modified for with the SCTP_RTOINFO socket option.
5019 */
5020 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5021 sp->rtoinfo.srto_max = net->sctp.rto_max;
5022 sp->rtoinfo.srto_min = net->sctp.rto_min;
5023
5024 /* Initialize default association related parameters. These parameters
5025 * can be modified with the SCTP_ASSOCINFO socket option.
5026 */
5027 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5028 sp->assocparams.sasoc_number_peer_destinations = 0;
5029 sp->assocparams.sasoc_peer_rwnd = 0;
5030 sp->assocparams.sasoc_local_rwnd = 0;
5031 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5032
5033 /* Initialize default event subscriptions. By default, all the
5034 * options are off.
5035 */
5036 sp->subscribe = 0;
5037
5038 /* Default Peer Address Parameters. These defaults can
5039 * be modified via SCTP_PEER_ADDR_PARAMS
5040 */
5041 sp->hbinterval = net->sctp.hb_interval;
5042 sp->pathmaxrxt = net->sctp.max_retrans_path;
5043 sp->pf_retrans = net->sctp.pf_retrans;
5044 sp->pathmtu = 0; /* allow default discovery */
5045 sp->sackdelay = net->sctp.sack_timeout;
5046 sp->sackfreq = 2;
5047 sp->param_flags = SPP_HB_ENABLE |
5048 SPP_PMTUD_ENABLE |
5049 SPP_SACKDELAY_ENABLE;
5050 sp->default_ss = SCTP_SS_DEFAULT;
5051
5052 /* If enabled no SCTP message fragmentation will be performed.
5053 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5054 */
5055 sp->disable_fragments = 0;
5056
5057 /* Enable Nagle algorithm by default. */
5058 sp->nodelay = 0;
5059
5060 sp->recvrcvinfo = 0;
5061 sp->recvnxtinfo = 0;
5062
5063 /* Enable by default. */
5064 sp->v4mapped = 1;
5065
5066 /* Auto-close idle associations after the configured
5067 * number of seconds. A value of 0 disables this
5068 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5069 * for UDP-style sockets only.
5070 */
5071 sp->autoclose = 0;
5072
5073 /* User specified fragmentation limit. */
5074 sp->user_frag = 0;
5075
5076 sp->adaptation_ind = 0;
5077
5078 sp->pf = sctp_get_pf_specific(sk->sk_family);
5079
5080 /* Control variables for partial data delivery. */
5081 atomic_set(&sp->pd_mode, 0);
5082 skb_queue_head_init(&sp->pd_lobby);
5083 sp->frag_interleave = 0;
5084
5085 /* Create a per socket endpoint structure. Even if we
5086 * change the data structure relationships, this may still
5087 * be useful for storing pre-connect address information.
5088 */
5089 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5090 if (!sp->ep)
5091 return -ENOMEM;
5092
5093 sp->hmac = NULL;
5094
5095 sk->sk_destruct = sctp_destruct_sock;
5096
5097 SCTP_DBG_OBJCNT_INC(sock);
5098
5099 local_bh_disable();
5100 sk_sockets_allocated_inc(sk);
5101 sock_prot_inuse_add(net, sk->sk_prot, 1);
5102
5103 /* Nothing can fail after this block, otherwise
5104 * sctp_destroy_sock() will be called without addr_wq_lock held
5105 */
5106 if (net->sctp.default_auto_asconf) {
5107 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5108 list_add_tail(&sp->auto_asconf_list,
5109 &net->sctp.auto_asconf_splist);
5110 sp->do_auto_asconf = 1;
5111 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5112 } else {
5113 sp->do_auto_asconf = 0;
5114 }
5115
5116 local_bh_enable();
5117
5118 return 0;
5119}
5120
5121/* Cleanup any SCTP per socket resources. Must be called with
5122 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5123 */
5124static void sctp_destroy_sock(struct sock *sk)
5125{
5126 struct sctp_sock *sp;
5127
5128 pr_debug("%s: sk:%p\n", __func__, sk);
5129
5130 /* Release our hold on the endpoint. */
5131 sp = sctp_sk(sk);
5132 /* This could happen during socket init, thus we bail out
5133 * early, since the rest of the below is not setup either.
5134 */
5135 if (sp->ep == NULL)
5136 return;
5137
5138 if (sp->do_auto_asconf) {
5139 sp->do_auto_asconf = 0;
5140 list_del(&sp->auto_asconf_list);
5141 }
5142 sctp_endpoint_free(sp->ep);
5143 local_bh_disable();
5144 sk_sockets_allocated_dec(sk);
5145 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5146 local_bh_enable();
5147}
5148
5149/* Triggered when there are no references on the socket anymore */
5150static void sctp_destruct_sock(struct sock *sk)
5151{
5152 struct sctp_sock *sp = sctp_sk(sk);
5153
5154 /* Free up the HMAC transform. */
5155 crypto_free_shash(sp->hmac);
5156
5157 inet_sock_destruct(sk);
5158}
5159
5160/* API 4.1.7 shutdown() - TCP Style Syntax
5161 * int shutdown(int socket, int how);
5162 *
5163 * sd - the socket descriptor of the association to be closed.
5164 * how - Specifies the type of shutdown. The values are
5165 * as follows:
5166 * SHUT_RD
5167 * Disables further receive operations. No SCTP
5168 * protocol action is taken.
5169 * SHUT_WR
5170 * Disables further send operations, and initiates
5171 * the SCTP shutdown sequence.
5172 * SHUT_RDWR
5173 * Disables further send and receive operations
5174 * and initiates the SCTP shutdown sequence.
5175 */
5176static void sctp_shutdown(struct sock *sk, int how)
5177{
5178 struct net *net = sock_net(sk);
5179 struct sctp_endpoint *ep;
5180
5181 if (!sctp_style(sk, TCP))
5182 return;
5183
5184 ep = sctp_sk(sk)->ep;
5185 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5186 struct sctp_association *asoc;
5187
5188 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5189 asoc = list_entry(ep->asocs.next,
5190 struct sctp_association, asocs);
5191 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5192 }
5193}
5194
5195int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5196 struct sctp_info *info)
5197{
5198 struct sctp_transport *prim;
5199 struct list_head *pos;
5200 int mask;
5201
5202 memset(info, 0, sizeof(*info));
5203 if (!asoc) {
5204 struct sctp_sock *sp = sctp_sk(sk);
5205
5206 info->sctpi_s_autoclose = sp->autoclose;
5207 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5208 info->sctpi_s_pd_point = sp->pd_point;
5209 info->sctpi_s_nodelay = sp->nodelay;
5210 info->sctpi_s_disable_fragments = sp->disable_fragments;
5211 info->sctpi_s_v4mapped = sp->v4mapped;
5212 info->sctpi_s_frag_interleave = sp->frag_interleave;
5213 info->sctpi_s_type = sp->type;
5214
5215 return 0;
5216 }
5217
5218 info->sctpi_tag = asoc->c.my_vtag;
5219 info->sctpi_state = asoc->state;
5220 info->sctpi_rwnd = asoc->a_rwnd;
5221 info->sctpi_unackdata = asoc->unack_data;
5222 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5223 info->sctpi_instrms = asoc->stream.incnt;
5224 info->sctpi_outstrms = asoc->stream.outcnt;
5225 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5226 info->sctpi_inqueue++;
5227 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5228 info->sctpi_outqueue++;
5229 info->sctpi_overall_error = asoc->overall_error_count;
5230 info->sctpi_max_burst = asoc->max_burst;
5231 info->sctpi_maxseg = asoc->frag_point;
5232 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5233 info->sctpi_peer_tag = asoc->c.peer_vtag;
5234
5235 mask = asoc->peer.ecn_capable << 1;
5236 mask = (mask | asoc->peer.ipv4_address) << 1;
5237 mask = (mask | asoc->peer.ipv6_address) << 1;
5238 mask = (mask | asoc->peer.hostname_address) << 1;
5239 mask = (mask | asoc->peer.asconf_capable) << 1;
5240 mask = (mask | asoc->peer.prsctp_capable) << 1;
5241 mask = (mask | asoc->peer.auth_capable);
5242 info->sctpi_peer_capable = mask;
5243 mask = asoc->peer.sack_needed << 1;
5244 mask = (mask | asoc->peer.sack_generation) << 1;
5245 mask = (mask | asoc->peer.zero_window_announced);
5246 info->sctpi_peer_sack = mask;
5247
5248 info->sctpi_isacks = asoc->stats.isacks;
5249 info->sctpi_osacks = asoc->stats.osacks;
5250 info->sctpi_opackets = asoc->stats.opackets;
5251 info->sctpi_ipackets = asoc->stats.ipackets;
5252 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5253 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5254 info->sctpi_idupchunks = asoc->stats.idupchunks;
5255 info->sctpi_gapcnt = asoc->stats.gapcnt;
5256 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5257 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5258 info->sctpi_oodchunks = asoc->stats.oodchunks;
5259 info->sctpi_iodchunks = asoc->stats.iodchunks;
5260 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5261 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5262
5263 prim = asoc->peer.primary_path;
5264 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5265 info->sctpi_p_state = prim->state;
5266 info->sctpi_p_cwnd = prim->cwnd;
5267 info->sctpi_p_srtt = prim->srtt;
5268 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5269 info->sctpi_p_hbinterval = prim->hbinterval;
5270 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5271 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5272 info->sctpi_p_ssthresh = prim->ssthresh;
5273 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5274 info->sctpi_p_flight_size = prim->flight_size;
5275 info->sctpi_p_error = prim->error_count;
5276
5277 return 0;
5278}
5279EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5280
5281/* use callback to avoid exporting the core structure */
5282void sctp_transport_walk_start(struct rhashtable_iter *iter)
5283{
5284 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5285
5286 rhashtable_walk_start(iter);
5287}
5288
5289void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5290{
5291 rhashtable_walk_stop(iter);
5292 rhashtable_walk_exit(iter);
5293}
5294
5295struct sctp_transport *sctp_transport_get_next(struct net *net,
5296 struct rhashtable_iter *iter)
5297{
5298 struct sctp_transport *t;
5299
5300 t = rhashtable_walk_next(iter);
5301 for (; t; t = rhashtable_walk_next(iter)) {
5302 if (IS_ERR(t)) {
5303 if (PTR_ERR(t) == -EAGAIN)
5304 continue;
5305 break;
5306 }
5307
5308 if (!sctp_transport_hold(t))
5309 continue;
5310
5311 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5312 t->asoc->peer.primary_path == t)
5313 break;
5314
5315 sctp_transport_put(t);
5316 }
5317
5318 return t;
5319}
5320
5321struct sctp_transport *sctp_transport_get_idx(struct net *net,
5322 struct rhashtable_iter *iter,
5323 int pos)
5324{
5325 struct sctp_transport *t;
5326
5327 if (!pos)
5328 return SEQ_START_TOKEN;
5329
5330 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5331 if (!--pos)
5332 break;
5333 sctp_transport_put(t);
5334 }
5335
5336 return t;
5337}
5338
5339int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5340 void *p) {
5341 int err = 0;
5342 int hash = 0;
5343 struct sctp_ep_common *epb;
5344 struct sctp_hashbucket *head;
5345
5346 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5347 hash++, head++) {
5348 read_lock_bh(&head->lock);
5349 sctp_for_each_hentry(epb, &head->chain) {
5350 err = cb(sctp_ep(epb), p);
5351 if (err)
5352 break;
5353 }
5354 read_unlock_bh(&head->lock);
5355 }
5356
5357 return err;
5358}
5359EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5360
5361int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5362 struct net *net,
5363 const union sctp_addr *laddr,
5364 const union sctp_addr *paddr, void *p)
5365{
5366 struct sctp_transport *transport;
5367 int err;
5368
5369 rcu_read_lock();
5370 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5371 rcu_read_unlock();
5372 if (!transport)
5373 return -ENOENT;
5374
5375 err = cb(transport, p);
5376 sctp_transport_put(transport);
5377
5378 return err;
5379}
5380EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5381
5382int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5383 int (*cb_done)(struct sctp_transport *, void *),
5384 struct net *net, int *pos, void *p) {
5385 struct rhashtable_iter hti;
5386 struct sctp_transport *tsp;
5387 int ret;
5388
5389again:
5390 ret = 0;
5391 sctp_transport_walk_start(&hti);
5392
5393 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5394 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5395 ret = cb(tsp, p);
5396 if (ret)
5397 break;
5398 (*pos)++;
5399 sctp_transport_put(tsp);
5400 }
5401 sctp_transport_walk_stop(&hti);
5402
5403 if (ret) {
5404 if (cb_done && !cb_done(tsp, p)) {
5405 (*pos)++;
5406 sctp_transport_put(tsp);
5407 goto again;
5408 }
5409 sctp_transport_put(tsp);
5410 }
5411
5412 return ret;
5413}
5414EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5415
5416/* 7.2.1 Association Status (SCTP_STATUS)
5417
5418 * Applications can retrieve current status information about an
5419 * association, including association state, peer receiver window size,
5420 * number of unacked data chunks, and number of data chunks pending
5421 * receipt. This information is read-only.
5422 */
5423static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5424 char __user *optval,
5425 int __user *optlen)
5426{
5427 struct sctp_status status;
5428 struct sctp_association *asoc = NULL;
5429 struct sctp_transport *transport;
5430 sctp_assoc_t associd;
5431 int retval = 0;
5432
5433 if (len < sizeof(status)) {
5434 retval = -EINVAL;
5435 goto out;
5436 }
5437
5438 len = sizeof(status);
5439 if (copy_from_user(&status, optval, len)) {
5440 retval = -EFAULT;
5441 goto out;
5442 }
5443
5444 associd = status.sstat_assoc_id;
5445 asoc = sctp_id2assoc(sk, associd);
5446 if (!asoc) {
5447 retval = -EINVAL;
5448 goto out;
5449 }
5450
5451 transport = asoc->peer.primary_path;
5452
5453 status.sstat_assoc_id = sctp_assoc2id(asoc);
5454 status.sstat_state = sctp_assoc_to_state(asoc);
5455 status.sstat_rwnd = asoc->peer.rwnd;
5456 status.sstat_unackdata = asoc->unack_data;
5457
5458 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5459 status.sstat_instrms = asoc->stream.incnt;
5460 status.sstat_outstrms = asoc->stream.outcnt;
5461 status.sstat_fragmentation_point = asoc->frag_point;
5462 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5463 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5464 transport->af_specific->sockaddr_len);
5465 /* Map ipv4 address into v4-mapped-on-v6 address. */
5466 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5467 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5468 status.sstat_primary.spinfo_state = transport->state;
5469 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5470 status.sstat_primary.spinfo_srtt = transport->srtt;
5471 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5472 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5473
5474 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5475 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5476
5477 if (put_user(len, optlen)) {
5478 retval = -EFAULT;
5479 goto out;
5480 }
5481
5482 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5483 __func__, len, status.sstat_state, status.sstat_rwnd,
5484 status.sstat_assoc_id);
5485
5486 if (copy_to_user(optval, &status, len)) {
5487 retval = -EFAULT;
5488 goto out;
5489 }
5490
5491out:
5492 return retval;
5493}
5494
5495
5496/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5497 *
5498 * Applications can retrieve information about a specific peer address
5499 * of an association, including its reachability state, congestion
5500 * window, and retransmission timer values. This information is
5501 * read-only.
5502 */
5503static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5504 char __user *optval,
5505 int __user *optlen)
5506{
5507 struct sctp_paddrinfo pinfo;
5508 struct sctp_transport *transport;
5509 int retval = 0;
5510
5511 if (len < sizeof(pinfo)) {
5512 retval = -EINVAL;
5513 goto out;
5514 }
5515
5516 len = sizeof(pinfo);
5517 if (copy_from_user(&pinfo, optval, len)) {
5518 retval = -EFAULT;
5519 goto out;
5520 }
5521
5522 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5523 pinfo.spinfo_assoc_id);
5524 if (!transport)
5525 return -EINVAL;
5526
5527 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5528 pinfo.spinfo_state = transport->state;
5529 pinfo.spinfo_cwnd = transport->cwnd;
5530 pinfo.spinfo_srtt = transport->srtt;
5531 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5532 pinfo.spinfo_mtu = transport->pathmtu;
5533
5534 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5535 pinfo.spinfo_state = SCTP_ACTIVE;
5536
5537 if (put_user(len, optlen)) {
5538 retval = -EFAULT;
5539 goto out;
5540 }
5541
5542 if (copy_to_user(optval, &pinfo, len)) {
5543 retval = -EFAULT;
5544 goto out;
5545 }
5546
5547out:
5548 return retval;
5549}
5550
5551/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5552 *
5553 * This option is a on/off flag. If enabled no SCTP message
5554 * fragmentation will be performed. Instead if a message being sent
5555 * exceeds the current PMTU size, the message will NOT be sent and
5556 * instead a error will be indicated to the user.
5557 */
5558static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5559 char __user *optval, int __user *optlen)
5560{
5561 int val;
5562
5563 if (len < sizeof(int))
5564 return -EINVAL;
5565
5566 len = sizeof(int);
5567 val = (sctp_sk(sk)->disable_fragments == 1);
5568 if (put_user(len, optlen))
5569 return -EFAULT;
5570 if (copy_to_user(optval, &val, len))
5571 return -EFAULT;
5572 return 0;
5573}
5574
5575/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5576 *
5577 * This socket option is used to specify various notifications and
5578 * ancillary data the user wishes to receive.
5579 */
5580static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5581 int __user *optlen)
5582{
5583 struct sctp_event_subscribe subscribe;
5584 __u8 *sn_type = (__u8 *)&subscribe;
5585 int i;
5586
5587 if (len == 0)
5588 return -EINVAL;
5589 if (len > sizeof(struct sctp_event_subscribe))
5590 len = sizeof(struct sctp_event_subscribe);
5591 if (put_user(len, optlen))
5592 return -EFAULT;
5593
5594 for (i = 0; i < len; i++)
5595 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5596 SCTP_SN_TYPE_BASE + i);
5597
5598 if (copy_to_user(optval, &subscribe, len))
5599 return -EFAULT;
5600
5601 return 0;
5602}
5603
5604/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5605 *
5606 * This socket option is applicable to the UDP-style socket only. When
5607 * set it will cause associations that are idle for more than the
5608 * specified number of seconds to automatically close. An association
5609 * being idle is defined an association that has NOT sent or received
5610 * user data. The special value of '0' indicates that no automatic
5611 * close of any associations should be performed. The option expects an
5612 * integer defining the number of seconds of idle time before an
5613 * association is closed.
5614 */
5615static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5616{
5617 /* Applicable to UDP-style socket only */
5618 if (sctp_style(sk, TCP))
5619 return -EOPNOTSUPP;
5620 if (len < sizeof(int))
5621 return -EINVAL;
5622 len = sizeof(int);
5623 if (put_user(len, optlen))
5624 return -EFAULT;
5625 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5626 return -EFAULT;
5627 return 0;
5628}
5629
5630/* Helper routine to branch off an association to a new socket. */
5631int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5632{
5633 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5634 struct sctp_sock *sp = sctp_sk(sk);
5635 struct socket *sock;
5636 int err = 0;
5637
5638 /* Do not peel off from one netns to another one. */
5639 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5640 return -EINVAL;
5641
5642 if (!asoc)
5643 return -EINVAL;
5644
5645 /* An association cannot be branched off from an already peeled-off
5646 * socket, nor is this supported for tcp style sockets.
5647 */
5648 if (!sctp_style(sk, UDP))
5649 return -EINVAL;
5650
5651 /* Create a new socket. */
5652 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5653 if (err < 0)
5654 return err;
5655
5656 sctp_copy_sock(sock->sk, sk, asoc);
5657
5658 /* Make peeled-off sockets more like 1-1 accepted sockets.
5659 * Set the daddr and initialize id to something more random and also
5660 * copy over any ip options.
5661 */
5662 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5663 sp->pf->copy_ip_options(sk, sock->sk);
5664
5665 /* Populate the fields of the newsk from the oldsk and migrate the
5666 * asoc to the newsk.
5667 */
5668 err = sctp_sock_migrate(sk, sock->sk, asoc,
5669 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5670 if (err) {
5671 sock_release(sock);
5672 sock = NULL;
5673 }
5674
5675 *sockp = sock;
5676
5677 return err;
5678}
5679EXPORT_SYMBOL(sctp_do_peeloff);
5680
5681static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5682 struct file **newfile, unsigned flags)
5683{
5684 struct socket *newsock;
5685 int retval;
5686
5687 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5688 if (retval < 0)
5689 goto out;
5690
5691 /* Map the socket to an unused fd that can be returned to the user. */
5692 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5693 if (retval < 0) {
5694 sock_release(newsock);
5695 goto out;
5696 }
5697
5698 *newfile = sock_alloc_file(newsock, 0, NULL);
5699 if (IS_ERR(*newfile)) {
5700 put_unused_fd(retval);
5701 retval = PTR_ERR(*newfile);
5702 *newfile = NULL;
5703 return retval;
5704 }
5705
5706 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5707 retval);
5708
5709 peeloff->sd = retval;
5710
5711 if (flags & SOCK_NONBLOCK)
5712 (*newfile)->f_flags |= O_NONBLOCK;
5713out:
5714 return retval;
5715}
5716
5717static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5718{
5719 sctp_peeloff_arg_t peeloff;
5720 struct file *newfile = NULL;
5721 int retval = 0;
5722
5723 if (len < sizeof(sctp_peeloff_arg_t))
5724 return -EINVAL;
5725 len = sizeof(sctp_peeloff_arg_t);
5726 if (copy_from_user(&peeloff, optval, len))
5727 return -EFAULT;
5728
5729 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5730 if (retval < 0)
5731 goto out;
5732
5733 /* Return the fd mapped to the new socket. */
5734 if (put_user(len, optlen)) {
5735 fput(newfile);
5736 put_unused_fd(retval);
5737 return -EFAULT;
5738 }
5739
5740 if (copy_to_user(optval, &peeloff, len)) {
5741 fput(newfile);
5742 put_unused_fd(retval);
5743 return -EFAULT;
5744 }
5745 fd_install(retval, newfile);
5746out:
5747 return retval;
5748}
5749
5750static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5751 char __user *optval, int __user *optlen)
5752{
5753 sctp_peeloff_flags_arg_t peeloff;
5754 struct file *newfile = NULL;
5755 int retval = 0;
5756
5757 if (len < sizeof(sctp_peeloff_flags_arg_t))
5758 return -EINVAL;
5759 len = sizeof(sctp_peeloff_flags_arg_t);
5760 if (copy_from_user(&peeloff, optval, len))
5761 return -EFAULT;
5762
5763 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5764 &newfile, peeloff.flags);
5765 if (retval < 0)
5766 goto out;
5767
5768 /* Return the fd mapped to the new socket. */
5769 if (put_user(len, optlen)) {
5770 fput(newfile);
5771 put_unused_fd(retval);
5772 return -EFAULT;
5773 }
5774
5775 if (copy_to_user(optval, &peeloff, len)) {
5776 fput(newfile);
5777 put_unused_fd(retval);
5778 return -EFAULT;
5779 }
5780 fd_install(retval, newfile);
5781out:
5782 return retval;
5783}
5784
5785/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5786 *
5787 * Applications can enable or disable heartbeats for any peer address of
5788 * an association, modify an address's heartbeat interval, force a
5789 * heartbeat to be sent immediately, and adjust the address's maximum
5790 * number of retransmissions sent before an address is considered
5791 * unreachable. The following structure is used to access and modify an
5792 * address's parameters:
5793 *
5794 * struct sctp_paddrparams {
5795 * sctp_assoc_t spp_assoc_id;
5796 * struct sockaddr_storage spp_address;
5797 * uint32_t spp_hbinterval;
5798 * uint16_t spp_pathmaxrxt;
5799 * uint32_t spp_pathmtu;
5800 * uint32_t spp_sackdelay;
5801 * uint32_t spp_flags;
5802 * };
5803 *
5804 * spp_assoc_id - (one-to-many style socket) This is filled in the
5805 * application, and identifies the association for
5806 * this query.
5807 * spp_address - This specifies which address is of interest.
5808 * spp_hbinterval - This contains the value of the heartbeat interval,
5809 * in milliseconds. If a value of zero
5810 * is present in this field then no changes are to
5811 * be made to this parameter.
5812 * spp_pathmaxrxt - This contains the maximum number of
5813 * retransmissions before this address shall be
5814 * considered unreachable. If a value of zero
5815 * is present in this field then no changes are to
5816 * be made to this parameter.
5817 * spp_pathmtu - When Path MTU discovery is disabled the value
5818 * specified here will be the "fixed" path mtu.
5819 * Note that if the spp_address field is empty
5820 * then all associations on this address will
5821 * have this fixed path mtu set upon them.
5822 *
5823 * spp_sackdelay - When delayed sack is enabled, this value specifies
5824 * the number of milliseconds that sacks will be delayed
5825 * for. This value will apply to all addresses of an
5826 * association if the spp_address field is empty. Note
5827 * also, that if delayed sack is enabled and this
5828 * value is set to 0, no change is made to the last
5829 * recorded delayed sack timer value.
5830 *
5831 * spp_flags - These flags are used to control various features
5832 * on an association. The flag field may contain
5833 * zero or more of the following options.
5834 *
5835 * SPP_HB_ENABLE - Enable heartbeats on the
5836 * specified address. Note that if the address
5837 * field is empty all addresses for the association
5838 * have heartbeats enabled upon them.
5839 *
5840 * SPP_HB_DISABLE - Disable heartbeats on the
5841 * speicifed address. Note that if the address
5842 * field is empty all addresses for the association
5843 * will have their heartbeats disabled. Note also
5844 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5845 * mutually exclusive, only one of these two should
5846 * be specified. Enabling both fields will have
5847 * undetermined results.
5848 *
5849 * SPP_HB_DEMAND - Request a user initiated heartbeat
5850 * to be made immediately.
5851 *
5852 * SPP_PMTUD_ENABLE - This field will enable PMTU
5853 * discovery upon the specified address. Note that
5854 * if the address feild is empty then all addresses
5855 * on the association are effected.
5856 *
5857 * SPP_PMTUD_DISABLE - This field will disable PMTU
5858 * discovery upon the specified address. Note that
5859 * if the address feild is empty then all addresses
5860 * on the association are effected. Not also that
5861 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5862 * exclusive. Enabling both will have undetermined
5863 * results.
5864 *
5865 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5866 * on delayed sack. The time specified in spp_sackdelay
5867 * is used to specify the sack delay for this address. Note
5868 * that if spp_address is empty then all addresses will
5869 * enable delayed sack and take on the sack delay
5870 * value specified in spp_sackdelay.
5871 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5872 * off delayed sack. If the spp_address field is blank then
5873 * delayed sack is disabled for the entire association. Note
5874 * also that this field is mutually exclusive to
5875 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5876 * results.
5877 *
5878 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5879 * setting of the IPV6 flow label value. The value is
5880 * contained in the spp_ipv6_flowlabel field.
5881 * Upon retrieval, this flag will be set to indicate that
5882 * the spp_ipv6_flowlabel field has a valid value returned.
5883 * If a specific destination address is set (in the
5884 * spp_address field), then the value returned is that of
5885 * the address. If just an association is specified (and
5886 * no address), then the association's default flow label
5887 * is returned. If neither an association nor a destination
5888 * is specified, then the socket's default flow label is
5889 * returned. For non-IPv6 sockets, this flag will be left
5890 * cleared.
5891 *
5892 * SPP_DSCP: Setting this flag enables the setting of the
5893 * Differentiated Services Code Point (DSCP) value
5894 * associated with either the association or a specific
5895 * address. The value is obtained in the spp_dscp field.
5896 * Upon retrieval, this flag will be set to indicate that
5897 * the spp_dscp field has a valid value returned. If a
5898 * specific destination address is set when called (in the
5899 * spp_address field), then that specific destination
5900 * address's DSCP value is returned. If just an association
5901 * is specified, then the association's default DSCP is
5902 * returned. If neither an association nor a destination is
5903 * specified, then the socket's default DSCP is returned.
5904 *
5905 * spp_ipv6_flowlabel
5906 * - This field is used in conjunction with the
5907 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5908 * The 20 least significant bits are used for the flow
5909 * label. This setting has precedence over any IPv6-layer
5910 * setting.
5911 *
5912 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5913 * and contains the DSCP. The 6 most significant bits are
5914 * used for the DSCP. This setting has precedence over any
5915 * IPv4- or IPv6- layer setting.
5916 */
5917static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5918 char __user *optval, int __user *optlen)
5919{
5920 struct sctp_paddrparams params;
5921 struct sctp_transport *trans = NULL;
5922 struct sctp_association *asoc = NULL;
5923 struct sctp_sock *sp = sctp_sk(sk);
5924
5925 if (len >= sizeof(params))
5926 len = sizeof(params);
5927 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5928 spp_ipv6_flowlabel), 4))
5929 len = ALIGN(offsetof(struct sctp_paddrparams,
5930 spp_ipv6_flowlabel), 4);
5931 else
5932 return -EINVAL;
5933
5934 if (copy_from_user(¶ms, optval, len))
5935 return -EFAULT;
5936
5937 /* If an address other than INADDR_ANY is specified, and
5938 * no transport is found, then the request is invalid.
5939 */
5940 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5941 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5942 params.spp_assoc_id);
5943 if (!trans) {
5944 pr_debug("%s: failed no transport\n", __func__);
5945 return -EINVAL;
5946 }
5947 }
5948
5949 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5950 * socket is a one to many style socket, and an association
5951 * was not found, then the id was invalid.
5952 */
5953 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5954 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5955 sctp_style(sk, UDP)) {
5956 pr_debug("%s: failed no association\n", __func__);
5957 return -EINVAL;
5958 }
5959
5960 if (trans) {
5961 /* Fetch transport values. */
5962 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5963 params.spp_pathmtu = trans->pathmtu;
5964 params.spp_pathmaxrxt = trans->pathmaxrxt;
5965 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5966
5967 /*draft-11 doesn't say what to return in spp_flags*/
5968 params.spp_flags = trans->param_flags;
5969 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5970 params.spp_ipv6_flowlabel = trans->flowlabel &
5971 SCTP_FLOWLABEL_VAL_MASK;
5972 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5973 }
5974 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5975 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5976 params.spp_flags |= SPP_DSCP;
5977 }
5978 } else if (asoc) {
5979 /* Fetch association values. */
5980 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5981 params.spp_pathmtu = asoc->pathmtu;
5982 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5983 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5984
5985 /*draft-11 doesn't say what to return in spp_flags*/
5986 params.spp_flags = asoc->param_flags;
5987 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5988 params.spp_ipv6_flowlabel = asoc->flowlabel &
5989 SCTP_FLOWLABEL_VAL_MASK;
5990 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5991 }
5992 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5993 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5994 params.spp_flags |= SPP_DSCP;
5995 }
5996 } else {
5997 /* Fetch socket values. */
5998 params.spp_hbinterval = sp->hbinterval;
5999 params.spp_pathmtu = sp->pathmtu;
6000 params.spp_sackdelay = sp->sackdelay;
6001 params.spp_pathmaxrxt = sp->pathmaxrxt;
6002
6003 /*draft-11 doesn't say what to return in spp_flags*/
6004 params.spp_flags = sp->param_flags;
6005 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6006 params.spp_ipv6_flowlabel = sp->flowlabel &
6007 SCTP_FLOWLABEL_VAL_MASK;
6008 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6009 }
6010 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6011 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6012 params.spp_flags |= SPP_DSCP;
6013 }
6014 }
6015
6016 if (copy_to_user(optval, ¶ms, len))
6017 return -EFAULT;
6018
6019 if (put_user(len, optlen))
6020 return -EFAULT;
6021
6022 return 0;
6023}
6024
6025/*
6026 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6027 *
6028 * This option will effect the way delayed acks are performed. This
6029 * option allows you to get or set the delayed ack time, in
6030 * milliseconds. It also allows changing the delayed ack frequency.
6031 * Changing the frequency to 1 disables the delayed sack algorithm. If
6032 * the assoc_id is 0, then this sets or gets the endpoints default
6033 * values. If the assoc_id field is non-zero, then the set or get
6034 * effects the specified association for the one to many model (the
6035 * assoc_id field is ignored by the one to one model). Note that if
6036 * sack_delay or sack_freq are 0 when setting this option, then the
6037 * current values will remain unchanged.
6038 *
6039 * struct sctp_sack_info {
6040 * sctp_assoc_t sack_assoc_id;
6041 * uint32_t sack_delay;
6042 * uint32_t sack_freq;
6043 * };
6044 *
6045 * sack_assoc_id - This parameter, indicates which association the user
6046 * is performing an action upon. Note that if this field's value is
6047 * zero then the endpoints default value is changed (effecting future
6048 * associations only).
6049 *
6050 * sack_delay - This parameter contains the number of milliseconds that
6051 * the user is requesting the delayed ACK timer be set to. Note that
6052 * this value is defined in the standard to be between 200 and 500
6053 * milliseconds.
6054 *
6055 * sack_freq - This parameter contains the number of packets that must
6056 * be received before a sack is sent without waiting for the delay
6057 * timer to expire. The default value for this is 2, setting this
6058 * value to 1 will disable the delayed sack algorithm.
6059 */
6060static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6061 char __user *optval,
6062 int __user *optlen)
6063{
6064 struct sctp_sack_info params;
6065 struct sctp_association *asoc = NULL;
6066 struct sctp_sock *sp = sctp_sk(sk);
6067
6068 if (len >= sizeof(struct sctp_sack_info)) {
6069 len = sizeof(struct sctp_sack_info);
6070
6071 if (copy_from_user(¶ms, optval, len))
6072 return -EFAULT;
6073 } else if (len == sizeof(struct sctp_assoc_value)) {
6074 pr_warn_ratelimited(DEPRECATED
6075 "%s (pid %d) "
6076 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6077 "Use struct sctp_sack_info instead\n",
6078 current->comm, task_pid_nr(current));
6079 if (copy_from_user(¶ms, optval, len))
6080 return -EFAULT;
6081 } else
6082 return -EINVAL;
6083
6084 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6085 * socket is a one to many style socket, and an association
6086 * was not found, then the id was invalid.
6087 */
6088 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6089 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6090 sctp_style(sk, UDP))
6091 return -EINVAL;
6092
6093 if (asoc) {
6094 /* Fetch association values. */
6095 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6096 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6097 params.sack_freq = asoc->sackfreq;
6098
6099 } else {
6100 params.sack_delay = 0;
6101 params.sack_freq = 1;
6102 }
6103 } else {
6104 /* Fetch socket values. */
6105 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6106 params.sack_delay = sp->sackdelay;
6107 params.sack_freq = sp->sackfreq;
6108 } else {
6109 params.sack_delay = 0;
6110 params.sack_freq = 1;
6111 }
6112 }
6113
6114 if (copy_to_user(optval, ¶ms, len))
6115 return -EFAULT;
6116
6117 if (put_user(len, optlen))
6118 return -EFAULT;
6119
6120 return 0;
6121}
6122
6123/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6124 *
6125 * Applications can specify protocol parameters for the default association
6126 * initialization. The option name argument to setsockopt() and getsockopt()
6127 * is SCTP_INITMSG.
6128 *
6129 * Setting initialization parameters is effective only on an unconnected
6130 * socket (for UDP-style sockets only future associations are effected
6131 * by the change). With TCP-style sockets, this option is inherited by
6132 * sockets derived from a listener socket.
6133 */
6134static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6135{
6136 if (len < sizeof(struct sctp_initmsg))
6137 return -EINVAL;
6138 len = sizeof(struct sctp_initmsg);
6139 if (put_user(len, optlen))
6140 return -EFAULT;
6141 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6142 return -EFAULT;
6143 return 0;
6144}
6145
6146
6147static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6148 char __user *optval, int __user *optlen)
6149{
6150 struct sctp_association *asoc;
6151 int cnt = 0;
6152 struct sctp_getaddrs getaddrs;
6153 struct sctp_transport *from;
6154 void __user *to;
6155 union sctp_addr temp;
6156 struct sctp_sock *sp = sctp_sk(sk);
6157 int addrlen;
6158 size_t space_left;
6159 int bytes_copied;
6160
6161 if (len < sizeof(struct sctp_getaddrs))
6162 return -EINVAL;
6163
6164 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6165 return -EFAULT;
6166
6167 /* For UDP-style sockets, id specifies the association to query. */
6168 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6169 if (!asoc)
6170 return -EINVAL;
6171
6172 to = optval + offsetof(struct sctp_getaddrs, addrs);
6173 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6174
6175 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6176 transports) {
6177 memcpy(&temp, &from->ipaddr, sizeof(temp));
6178 addrlen = sctp_get_pf_specific(sk->sk_family)
6179 ->addr_to_user(sp, &temp);
6180 if (space_left < addrlen)
6181 return -ENOMEM;
6182 if (copy_to_user(to, &temp, addrlen))
6183 return -EFAULT;
6184 to += addrlen;
6185 cnt++;
6186 space_left -= addrlen;
6187 }
6188
6189 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6190 return -EFAULT;
6191 bytes_copied = ((char __user *)to) - optval;
6192 if (put_user(bytes_copied, optlen))
6193 return -EFAULT;
6194
6195 return 0;
6196}
6197
6198static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6199 size_t space_left, int *bytes_copied)
6200{
6201 struct sctp_sockaddr_entry *addr;
6202 union sctp_addr temp;
6203 int cnt = 0;
6204 int addrlen;
6205 struct net *net = sock_net(sk);
6206
6207 rcu_read_lock();
6208 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6209 if (!addr->valid)
6210 continue;
6211
6212 if ((PF_INET == sk->sk_family) &&
6213 (AF_INET6 == addr->a.sa.sa_family))
6214 continue;
6215 if ((PF_INET6 == sk->sk_family) &&
6216 inet_v6_ipv6only(sk) &&
6217 (AF_INET == addr->a.sa.sa_family))
6218 continue;
6219 memcpy(&temp, &addr->a, sizeof(temp));
6220 if (!temp.v4.sin_port)
6221 temp.v4.sin_port = htons(port);
6222
6223 addrlen = sctp_get_pf_specific(sk->sk_family)
6224 ->addr_to_user(sctp_sk(sk), &temp);
6225
6226 if (space_left < addrlen) {
6227 cnt = -ENOMEM;
6228 break;
6229 }
6230 memcpy(to, &temp, addrlen);
6231
6232 to += addrlen;
6233 cnt++;
6234 space_left -= addrlen;
6235 *bytes_copied += addrlen;
6236 }
6237 rcu_read_unlock();
6238
6239 return cnt;
6240}
6241
6242
6243static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6244 char __user *optval, int __user *optlen)
6245{
6246 struct sctp_bind_addr *bp;
6247 struct sctp_association *asoc;
6248 int cnt = 0;
6249 struct sctp_getaddrs getaddrs;
6250 struct sctp_sockaddr_entry *addr;
6251 void __user *to;
6252 union sctp_addr temp;
6253 struct sctp_sock *sp = sctp_sk(sk);
6254 int addrlen;
6255 int err = 0;
6256 size_t space_left;
6257 int bytes_copied = 0;
6258 void *addrs;
6259 void *buf;
6260
6261 if (len < sizeof(struct sctp_getaddrs))
6262 return -EINVAL;
6263
6264 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6265 return -EFAULT;
6266
6267 /*
6268 * For UDP-style sockets, id specifies the association to query.
6269 * If the id field is set to the value '0' then the locally bound
6270 * addresses are returned without regard to any particular
6271 * association.
6272 */
6273 if (0 == getaddrs.assoc_id) {
6274 bp = &sctp_sk(sk)->ep->base.bind_addr;
6275 } else {
6276 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6277 if (!asoc)
6278 return -EINVAL;
6279 bp = &asoc->base.bind_addr;
6280 }
6281
6282 to = optval + offsetof(struct sctp_getaddrs, addrs);
6283 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6284
6285 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6286 if (!addrs)
6287 return -ENOMEM;
6288
6289 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6290 * addresses from the global local address list.
6291 */
6292 if (sctp_list_single_entry(&bp->address_list)) {
6293 addr = list_entry(bp->address_list.next,
6294 struct sctp_sockaddr_entry, list);
6295 if (sctp_is_any(sk, &addr->a)) {
6296 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6297 space_left, &bytes_copied);
6298 if (cnt < 0) {
6299 err = cnt;
6300 goto out;
6301 }
6302 goto copy_getaddrs;
6303 }
6304 }
6305
6306 buf = addrs;
6307 /* Protection on the bound address list is not needed since
6308 * in the socket option context we hold a socket lock and
6309 * thus the bound address list can't change.
6310 */
6311 list_for_each_entry(addr, &bp->address_list, list) {
6312 memcpy(&temp, &addr->a, sizeof(temp));
6313 addrlen = sctp_get_pf_specific(sk->sk_family)
6314 ->addr_to_user(sp, &temp);
6315 if (space_left < addrlen) {
6316 err = -ENOMEM; /*fixme: right error?*/
6317 goto out;
6318 }
6319 memcpy(buf, &temp, addrlen);
6320 buf += addrlen;
6321 bytes_copied += addrlen;
6322 cnt++;
6323 space_left -= addrlen;
6324 }
6325
6326copy_getaddrs:
6327 if (copy_to_user(to, addrs, bytes_copied)) {
6328 err = -EFAULT;
6329 goto out;
6330 }
6331 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6332 err = -EFAULT;
6333 goto out;
6334 }
6335 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6336 * but we can't change it anymore.
6337 */
6338 if (put_user(bytes_copied, optlen))
6339 err = -EFAULT;
6340out:
6341 kfree(addrs);
6342 return err;
6343}
6344
6345/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6346 *
6347 * Requests that the local SCTP stack use the enclosed peer address as
6348 * the association primary. The enclosed address must be one of the
6349 * association peer's addresses.
6350 */
6351static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6352 char __user *optval, int __user *optlen)
6353{
6354 struct sctp_prim prim;
6355 struct sctp_association *asoc;
6356 struct sctp_sock *sp = sctp_sk(sk);
6357
6358 if (len < sizeof(struct sctp_prim))
6359 return -EINVAL;
6360
6361 len = sizeof(struct sctp_prim);
6362
6363 if (copy_from_user(&prim, optval, len))
6364 return -EFAULT;
6365
6366 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6367 if (!asoc)
6368 return -EINVAL;
6369
6370 if (!asoc->peer.primary_path)
6371 return -ENOTCONN;
6372
6373 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6374 asoc->peer.primary_path->af_specific->sockaddr_len);
6375
6376 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6377 (union sctp_addr *)&prim.ssp_addr);
6378
6379 if (put_user(len, optlen))
6380 return -EFAULT;
6381 if (copy_to_user(optval, &prim, len))
6382 return -EFAULT;
6383
6384 return 0;
6385}
6386
6387/*
6388 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6389 *
6390 * Requests that the local endpoint set the specified Adaptation Layer
6391 * Indication parameter for all future INIT and INIT-ACK exchanges.
6392 */
6393static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6394 char __user *optval, int __user *optlen)
6395{
6396 struct sctp_setadaptation adaptation;
6397
6398 if (len < sizeof(struct sctp_setadaptation))
6399 return -EINVAL;
6400
6401 len = sizeof(struct sctp_setadaptation);
6402
6403 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6404
6405 if (put_user(len, optlen))
6406 return -EFAULT;
6407 if (copy_to_user(optval, &adaptation, len))
6408 return -EFAULT;
6409
6410 return 0;
6411}
6412
6413/*
6414 *
6415 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6416 *
6417 * Applications that wish to use the sendto() system call may wish to
6418 * specify a default set of parameters that would normally be supplied
6419 * through the inclusion of ancillary data. This socket option allows
6420 * such an application to set the default sctp_sndrcvinfo structure.
6421
6422
6423 * The application that wishes to use this socket option simply passes
6424 * in to this call the sctp_sndrcvinfo structure defined in Section
6425 * 5.2.2) The input parameters accepted by this call include
6426 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6427 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6428 * to this call if the caller is using the UDP model.
6429 *
6430 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6431 */
6432static int sctp_getsockopt_default_send_param(struct sock *sk,
6433 int len, char __user *optval,
6434 int __user *optlen)
6435{
6436 struct sctp_sock *sp = sctp_sk(sk);
6437 struct sctp_association *asoc;
6438 struct sctp_sndrcvinfo info;
6439
6440 if (len < sizeof(info))
6441 return -EINVAL;
6442
6443 len = sizeof(info);
6444
6445 if (copy_from_user(&info, optval, len))
6446 return -EFAULT;
6447
6448 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6449 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6450 sctp_style(sk, UDP))
6451 return -EINVAL;
6452
6453 if (asoc) {
6454 info.sinfo_stream = asoc->default_stream;
6455 info.sinfo_flags = asoc->default_flags;
6456 info.sinfo_ppid = asoc->default_ppid;
6457 info.sinfo_context = asoc->default_context;
6458 info.sinfo_timetolive = asoc->default_timetolive;
6459 } else {
6460 info.sinfo_stream = sp->default_stream;
6461 info.sinfo_flags = sp->default_flags;
6462 info.sinfo_ppid = sp->default_ppid;
6463 info.sinfo_context = sp->default_context;
6464 info.sinfo_timetolive = sp->default_timetolive;
6465 }
6466
6467 if (put_user(len, optlen))
6468 return -EFAULT;
6469 if (copy_to_user(optval, &info, len))
6470 return -EFAULT;
6471
6472 return 0;
6473}
6474
6475/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6476 * (SCTP_DEFAULT_SNDINFO)
6477 */
6478static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6479 char __user *optval,
6480 int __user *optlen)
6481{
6482 struct sctp_sock *sp = sctp_sk(sk);
6483 struct sctp_association *asoc;
6484 struct sctp_sndinfo info;
6485
6486 if (len < sizeof(info))
6487 return -EINVAL;
6488
6489 len = sizeof(info);
6490
6491 if (copy_from_user(&info, optval, len))
6492 return -EFAULT;
6493
6494 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6495 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6496 sctp_style(sk, UDP))
6497 return -EINVAL;
6498
6499 if (asoc) {
6500 info.snd_sid = asoc->default_stream;
6501 info.snd_flags = asoc->default_flags;
6502 info.snd_ppid = asoc->default_ppid;
6503 info.snd_context = asoc->default_context;
6504 } else {
6505 info.snd_sid = sp->default_stream;
6506 info.snd_flags = sp->default_flags;
6507 info.snd_ppid = sp->default_ppid;
6508 info.snd_context = sp->default_context;
6509 }
6510
6511 if (put_user(len, optlen))
6512 return -EFAULT;
6513 if (copy_to_user(optval, &info, len))
6514 return -EFAULT;
6515
6516 return 0;
6517}
6518
6519/*
6520 *
6521 * 7.1.5 SCTP_NODELAY
6522 *
6523 * Turn on/off any Nagle-like algorithm. This means that packets are
6524 * generally sent as soon as possible and no unnecessary delays are
6525 * introduced, at the cost of more packets in the network. Expects an
6526 * integer boolean flag.
6527 */
6528
6529static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6530 char __user *optval, int __user *optlen)
6531{
6532 int val;
6533
6534 if (len < sizeof(int))
6535 return -EINVAL;
6536
6537 len = sizeof(int);
6538 val = (sctp_sk(sk)->nodelay == 1);
6539 if (put_user(len, optlen))
6540 return -EFAULT;
6541 if (copy_to_user(optval, &val, len))
6542 return -EFAULT;
6543 return 0;
6544}
6545
6546/*
6547 *
6548 * 7.1.1 SCTP_RTOINFO
6549 *
6550 * The protocol parameters used to initialize and bound retransmission
6551 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6552 * and modify these parameters.
6553 * All parameters are time values, in milliseconds. A value of 0, when
6554 * modifying the parameters, indicates that the current value should not
6555 * be changed.
6556 *
6557 */
6558static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6559 char __user *optval,
6560 int __user *optlen) {
6561 struct sctp_rtoinfo rtoinfo;
6562 struct sctp_association *asoc;
6563
6564 if (len < sizeof (struct sctp_rtoinfo))
6565 return -EINVAL;
6566
6567 len = sizeof(struct sctp_rtoinfo);
6568
6569 if (copy_from_user(&rtoinfo, optval, len))
6570 return -EFAULT;
6571
6572 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6573
6574 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6575 sctp_style(sk, UDP))
6576 return -EINVAL;
6577
6578 /* Values corresponding to the specific association. */
6579 if (asoc) {
6580 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6581 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6582 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6583 } else {
6584 /* Values corresponding to the endpoint. */
6585 struct sctp_sock *sp = sctp_sk(sk);
6586
6587 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6588 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6589 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6590 }
6591
6592 if (put_user(len, optlen))
6593 return -EFAULT;
6594
6595 if (copy_to_user(optval, &rtoinfo, len))
6596 return -EFAULT;
6597
6598 return 0;
6599}
6600
6601/*
6602 *
6603 * 7.1.2 SCTP_ASSOCINFO
6604 *
6605 * This option is used to tune the maximum retransmission attempts
6606 * of the association.
6607 * Returns an error if the new association retransmission value is
6608 * greater than the sum of the retransmission value of the peer.
6609 * See [SCTP] for more information.
6610 *
6611 */
6612static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6613 char __user *optval,
6614 int __user *optlen)
6615{
6616
6617 struct sctp_assocparams assocparams;
6618 struct sctp_association *asoc;
6619 struct list_head *pos;
6620 int cnt = 0;
6621
6622 if (len < sizeof (struct sctp_assocparams))
6623 return -EINVAL;
6624
6625 len = sizeof(struct sctp_assocparams);
6626
6627 if (copy_from_user(&assocparams, optval, len))
6628 return -EFAULT;
6629
6630 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6631
6632 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6633 sctp_style(sk, UDP))
6634 return -EINVAL;
6635
6636 /* Values correspoinding to the specific association */
6637 if (asoc) {
6638 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6639 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6640 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6641 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6642
6643 list_for_each(pos, &asoc->peer.transport_addr_list) {
6644 cnt++;
6645 }
6646
6647 assocparams.sasoc_number_peer_destinations = cnt;
6648 } else {
6649 /* Values corresponding to the endpoint */
6650 struct sctp_sock *sp = sctp_sk(sk);
6651
6652 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6653 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6654 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6655 assocparams.sasoc_cookie_life =
6656 sp->assocparams.sasoc_cookie_life;
6657 assocparams.sasoc_number_peer_destinations =
6658 sp->assocparams.
6659 sasoc_number_peer_destinations;
6660 }
6661
6662 if (put_user(len, optlen))
6663 return -EFAULT;
6664
6665 if (copy_to_user(optval, &assocparams, len))
6666 return -EFAULT;
6667
6668 return 0;
6669}
6670
6671/*
6672 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6673 *
6674 * This socket option is a boolean flag which turns on or off mapped V4
6675 * addresses. If this option is turned on and the socket is type
6676 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6677 * If this option is turned off, then no mapping will be done of V4
6678 * addresses and a user will receive both PF_INET6 and PF_INET type
6679 * addresses on the socket.
6680 */
6681static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6682 char __user *optval, int __user *optlen)
6683{
6684 int val;
6685 struct sctp_sock *sp = sctp_sk(sk);
6686
6687 if (len < sizeof(int))
6688 return -EINVAL;
6689
6690 len = sizeof(int);
6691 val = sp->v4mapped;
6692 if (put_user(len, optlen))
6693 return -EFAULT;
6694 if (copy_to_user(optval, &val, len))
6695 return -EFAULT;
6696
6697 return 0;
6698}
6699
6700/*
6701 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6702 * (chapter and verse is quoted at sctp_setsockopt_context())
6703 */
6704static int sctp_getsockopt_context(struct sock *sk, int len,
6705 char __user *optval, int __user *optlen)
6706{
6707 struct sctp_assoc_value params;
6708 struct sctp_association *asoc;
6709
6710 if (len < sizeof(struct sctp_assoc_value))
6711 return -EINVAL;
6712
6713 len = sizeof(struct sctp_assoc_value);
6714
6715 if (copy_from_user(¶ms, optval, len))
6716 return -EFAULT;
6717
6718 asoc = sctp_id2assoc(sk, params.assoc_id);
6719 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6720 sctp_style(sk, UDP))
6721 return -EINVAL;
6722
6723 params.assoc_value = asoc ? asoc->default_rcv_context
6724 : sctp_sk(sk)->default_rcv_context;
6725
6726 if (put_user(len, optlen))
6727 return -EFAULT;
6728 if (copy_to_user(optval, ¶ms, len))
6729 return -EFAULT;
6730
6731 return 0;
6732}
6733
6734/*
6735 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6736 * This option will get or set the maximum size to put in any outgoing
6737 * SCTP DATA chunk. If a message is larger than this size it will be
6738 * fragmented by SCTP into the specified size. Note that the underlying
6739 * SCTP implementation may fragment into smaller sized chunks when the
6740 * PMTU of the underlying association is smaller than the value set by
6741 * the user. The default value for this option is '0' which indicates
6742 * the user is NOT limiting fragmentation and only the PMTU will effect
6743 * SCTP's choice of DATA chunk size. Note also that values set larger
6744 * than the maximum size of an IP datagram will effectively let SCTP
6745 * control fragmentation (i.e. the same as setting this option to 0).
6746 *
6747 * The following structure is used to access and modify this parameter:
6748 *
6749 * struct sctp_assoc_value {
6750 * sctp_assoc_t assoc_id;
6751 * uint32_t assoc_value;
6752 * };
6753 *
6754 * assoc_id: This parameter is ignored for one-to-one style sockets.
6755 * For one-to-many style sockets this parameter indicates which
6756 * association the user is performing an action upon. Note that if
6757 * this field's value is zero then the endpoints default value is
6758 * changed (effecting future associations only).
6759 * assoc_value: This parameter specifies the maximum size in bytes.
6760 */
6761static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6762 char __user *optval, int __user *optlen)
6763{
6764 struct sctp_assoc_value params;
6765 struct sctp_association *asoc;
6766
6767 if (len == sizeof(int)) {
6768 pr_warn_ratelimited(DEPRECATED
6769 "%s (pid %d) "
6770 "Use of int in maxseg socket option.\n"
6771 "Use struct sctp_assoc_value instead\n",
6772 current->comm, task_pid_nr(current));
6773 params.assoc_id = SCTP_FUTURE_ASSOC;
6774 } else if (len >= sizeof(struct sctp_assoc_value)) {
6775 len = sizeof(struct sctp_assoc_value);
6776 if (copy_from_user(¶ms, optval, len))
6777 return -EFAULT;
6778 } else
6779 return -EINVAL;
6780
6781 asoc = sctp_id2assoc(sk, params.assoc_id);
6782 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6783 sctp_style(sk, UDP))
6784 return -EINVAL;
6785
6786 if (asoc)
6787 params.assoc_value = asoc->frag_point;
6788 else
6789 params.assoc_value = sctp_sk(sk)->user_frag;
6790
6791 if (put_user(len, optlen))
6792 return -EFAULT;
6793 if (len == sizeof(int)) {
6794 if (copy_to_user(optval, ¶ms.assoc_value, len))
6795 return -EFAULT;
6796 } else {
6797 if (copy_to_user(optval, ¶ms, len))
6798 return -EFAULT;
6799 }
6800
6801 return 0;
6802}
6803
6804/*
6805 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6806 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6807 */
6808static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6809 char __user *optval, int __user *optlen)
6810{
6811 int val;
6812
6813 if (len < sizeof(int))
6814 return -EINVAL;
6815
6816 len = sizeof(int);
6817
6818 val = sctp_sk(sk)->frag_interleave;
6819 if (put_user(len, optlen))
6820 return -EFAULT;
6821 if (copy_to_user(optval, &val, len))
6822 return -EFAULT;
6823
6824 return 0;
6825}
6826
6827/*
6828 * 7.1.25. Set or Get the sctp partial delivery point
6829 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6830 */
6831static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6832 char __user *optval,
6833 int __user *optlen)
6834{
6835 u32 val;
6836
6837 if (len < sizeof(u32))
6838 return -EINVAL;
6839
6840 len = sizeof(u32);
6841
6842 val = sctp_sk(sk)->pd_point;
6843 if (put_user(len, optlen))
6844 return -EFAULT;
6845 if (copy_to_user(optval, &val, len))
6846 return -EFAULT;
6847
6848 return 0;
6849}
6850
6851/*
6852 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6853 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6854 */
6855static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6856 char __user *optval,
6857 int __user *optlen)
6858{
6859 struct sctp_assoc_value params;
6860 struct sctp_association *asoc;
6861
6862 if (len == sizeof(int)) {
6863 pr_warn_ratelimited(DEPRECATED
6864 "%s (pid %d) "
6865 "Use of int in max_burst socket option.\n"
6866 "Use struct sctp_assoc_value instead\n",
6867 current->comm, task_pid_nr(current));
6868 params.assoc_id = SCTP_FUTURE_ASSOC;
6869 } else if (len >= sizeof(struct sctp_assoc_value)) {
6870 len = sizeof(struct sctp_assoc_value);
6871 if (copy_from_user(¶ms, optval, len))
6872 return -EFAULT;
6873 } else
6874 return -EINVAL;
6875
6876 asoc = sctp_id2assoc(sk, params.assoc_id);
6877 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6878 sctp_style(sk, UDP))
6879 return -EINVAL;
6880
6881 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6882
6883 if (len == sizeof(int)) {
6884 if (copy_to_user(optval, ¶ms.assoc_value, len))
6885 return -EFAULT;
6886 } else {
6887 if (copy_to_user(optval, ¶ms, len))
6888 return -EFAULT;
6889 }
6890
6891 return 0;
6892
6893}
6894
6895static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6896 char __user *optval, int __user *optlen)
6897{
6898 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6899 struct sctp_hmacalgo __user *p = (void __user *)optval;
6900 struct sctp_hmac_algo_param *hmacs;
6901 __u16 data_len = 0;
6902 u32 num_idents;
6903 int i;
6904
6905 if (!ep->auth_enable)
6906 return -EACCES;
6907
6908 hmacs = ep->auth_hmacs_list;
6909 data_len = ntohs(hmacs->param_hdr.length) -
6910 sizeof(struct sctp_paramhdr);
6911
6912 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6913 return -EINVAL;
6914
6915 len = sizeof(struct sctp_hmacalgo) + data_len;
6916 num_idents = data_len / sizeof(u16);
6917
6918 if (put_user(len, optlen))
6919 return -EFAULT;
6920 if (put_user(num_idents, &p->shmac_num_idents))
6921 return -EFAULT;
6922 for (i = 0; i < num_idents; i++) {
6923 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6924
6925 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6926 return -EFAULT;
6927 }
6928 return 0;
6929}
6930
6931static int sctp_getsockopt_active_key(struct sock *sk, int len,
6932 char __user *optval, int __user *optlen)
6933{
6934 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6935 struct sctp_authkeyid val;
6936 struct sctp_association *asoc;
6937
6938 if (len < sizeof(struct sctp_authkeyid))
6939 return -EINVAL;
6940
6941 len = sizeof(struct sctp_authkeyid);
6942 if (copy_from_user(&val, optval, len))
6943 return -EFAULT;
6944
6945 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6946 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6947 return -EINVAL;
6948
6949 if (asoc) {
6950 if (!asoc->peer.auth_capable)
6951 return -EACCES;
6952 val.scact_keynumber = asoc->active_key_id;
6953 } else {
6954 if (!ep->auth_enable)
6955 return -EACCES;
6956 val.scact_keynumber = ep->active_key_id;
6957 }
6958
6959 if (put_user(len, optlen))
6960 return -EFAULT;
6961 if (copy_to_user(optval, &val, len))
6962 return -EFAULT;
6963
6964 return 0;
6965}
6966
6967static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6968 char __user *optval, int __user *optlen)
6969{
6970 struct sctp_authchunks __user *p = (void __user *)optval;
6971 struct sctp_authchunks val;
6972 struct sctp_association *asoc;
6973 struct sctp_chunks_param *ch;
6974 u32 num_chunks = 0;
6975 char __user *to;
6976
6977 if (len < sizeof(struct sctp_authchunks))
6978 return -EINVAL;
6979
6980 if (copy_from_user(&val, optval, sizeof(val)))
6981 return -EFAULT;
6982
6983 to = p->gauth_chunks;
6984 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6985 if (!asoc)
6986 return -EINVAL;
6987
6988 if (!asoc->peer.auth_capable)
6989 return -EACCES;
6990
6991 ch = asoc->peer.peer_chunks;
6992 if (!ch)
6993 goto num;
6994
6995 /* See if the user provided enough room for all the data */
6996 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6997 if (len < num_chunks)
6998 return -EINVAL;
6999
7000 if (copy_to_user(to, ch->chunks, num_chunks))
7001 return -EFAULT;
7002num:
7003 len = sizeof(struct sctp_authchunks) + num_chunks;
7004 if (put_user(len, optlen))
7005 return -EFAULT;
7006 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7007 return -EFAULT;
7008 return 0;
7009}
7010
7011static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7012 char __user *optval, int __user *optlen)
7013{
7014 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7015 struct sctp_authchunks __user *p = (void __user *)optval;
7016 struct sctp_authchunks val;
7017 struct sctp_association *asoc;
7018 struct sctp_chunks_param *ch;
7019 u32 num_chunks = 0;
7020 char __user *to;
7021
7022 if (len < sizeof(struct sctp_authchunks))
7023 return -EINVAL;
7024
7025 if (copy_from_user(&val, optval, sizeof(val)))
7026 return -EFAULT;
7027
7028 to = p->gauth_chunks;
7029 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7030 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7031 sctp_style(sk, UDP))
7032 return -EINVAL;
7033
7034 if (asoc) {
7035 if (!asoc->peer.auth_capable)
7036 return -EACCES;
7037 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7038 } else {
7039 if (!ep->auth_enable)
7040 return -EACCES;
7041 ch = ep->auth_chunk_list;
7042 }
7043 if (!ch)
7044 goto num;
7045
7046 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7047 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7048 return -EINVAL;
7049
7050 if (copy_to_user(to, ch->chunks, num_chunks))
7051 return -EFAULT;
7052num:
7053 len = sizeof(struct sctp_authchunks) + num_chunks;
7054 if (put_user(len, optlen))
7055 return -EFAULT;
7056 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7057 return -EFAULT;
7058
7059 return 0;
7060}
7061
7062/*
7063 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7064 * This option gets the current number of associations that are attached
7065 * to a one-to-many style socket. The option value is an uint32_t.
7066 */
7067static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7068 char __user *optval, int __user *optlen)
7069{
7070 struct sctp_sock *sp = sctp_sk(sk);
7071 struct sctp_association *asoc;
7072 u32 val = 0;
7073
7074 if (sctp_style(sk, TCP))
7075 return -EOPNOTSUPP;
7076
7077 if (len < sizeof(u32))
7078 return -EINVAL;
7079
7080 len = sizeof(u32);
7081
7082 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7083 val++;
7084 }
7085
7086 if (put_user(len, optlen))
7087 return -EFAULT;
7088 if (copy_to_user(optval, &val, len))
7089 return -EFAULT;
7090
7091 return 0;
7092}
7093
7094/*
7095 * 8.1.23 SCTP_AUTO_ASCONF
7096 * See the corresponding setsockopt entry as description
7097 */
7098static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7099 char __user *optval, int __user *optlen)
7100{
7101 int val = 0;
7102
7103 if (len < sizeof(int))
7104 return -EINVAL;
7105
7106 len = sizeof(int);
7107 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7108 val = 1;
7109 if (put_user(len, optlen))
7110 return -EFAULT;
7111 if (copy_to_user(optval, &val, len))
7112 return -EFAULT;
7113 return 0;
7114}
7115
7116/*
7117 * 8.2.6. Get the Current Identifiers of Associations
7118 * (SCTP_GET_ASSOC_ID_LIST)
7119 *
7120 * This option gets the current list of SCTP association identifiers of
7121 * the SCTP associations handled by a one-to-many style socket.
7122 */
7123static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7124 char __user *optval, int __user *optlen)
7125{
7126 struct sctp_sock *sp = sctp_sk(sk);
7127 struct sctp_association *asoc;
7128 struct sctp_assoc_ids *ids;
7129 u32 num = 0;
7130
7131 if (sctp_style(sk, TCP))
7132 return -EOPNOTSUPP;
7133
7134 if (len < sizeof(struct sctp_assoc_ids))
7135 return -EINVAL;
7136
7137 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7138 num++;
7139 }
7140
7141 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7142 return -EINVAL;
7143
7144 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7145
7146 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7147 if (unlikely(!ids))
7148 return -ENOMEM;
7149
7150 ids->gaids_number_of_ids = num;
7151 num = 0;
7152 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7153 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7154 }
7155
7156 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7157 kfree(ids);
7158 return -EFAULT;
7159 }
7160
7161 kfree(ids);
7162 return 0;
7163}
7164
7165/*
7166 * SCTP_PEER_ADDR_THLDS
7167 *
7168 * This option allows us to fetch the partially failed threshold for one or all
7169 * transports in an association. See Section 6.1 of:
7170 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7171 */
7172static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7173 char __user *optval,
7174 int len,
7175 int __user *optlen)
7176{
7177 struct sctp_paddrthlds val;
7178 struct sctp_transport *trans;
7179 struct sctp_association *asoc;
7180
7181 if (len < sizeof(struct sctp_paddrthlds))
7182 return -EINVAL;
7183 len = sizeof(struct sctp_paddrthlds);
7184 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
7185 return -EFAULT;
7186
7187 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7188 trans = sctp_addr_id2transport(sk, &val.spt_address,
7189 val.spt_assoc_id);
7190 if (!trans)
7191 return -ENOENT;
7192
7193 val.spt_pathmaxrxt = trans->pathmaxrxt;
7194 val.spt_pathpfthld = trans->pf_retrans;
7195
7196 goto out;
7197 }
7198
7199 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7200 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7201 sctp_style(sk, UDP))
7202 return -EINVAL;
7203
7204 if (asoc) {
7205 val.spt_pathpfthld = asoc->pf_retrans;
7206 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7207 } else {
7208 struct sctp_sock *sp = sctp_sk(sk);
7209
7210 val.spt_pathpfthld = sp->pf_retrans;
7211 val.spt_pathmaxrxt = sp->pathmaxrxt;
7212 }
7213
7214out:
7215 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7216 return -EFAULT;
7217
7218 return 0;
7219}
7220
7221/*
7222 * SCTP_GET_ASSOC_STATS
7223 *
7224 * This option retrieves local per endpoint statistics. It is modeled
7225 * after OpenSolaris' implementation
7226 */
7227static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7228 char __user *optval,
7229 int __user *optlen)
7230{
7231 struct sctp_assoc_stats sas;
7232 struct sctp_association *asoc = NULL;
7233
7234 /* User must provide at least the assoc id */
7235 if (len < sizeof(sctp_assoc_t))
7236 return -EINVAL;
7237
7238 /* Allow the struct to grow and fill in as much as possible */
7239 len = min_t(size_t, len, sizeof(sas));
7240
7241 if (copy_from_user(&sas, optval, len))
7242 return -EFAULT;
7243
7244 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7245 if (!asoc)
7246 return -EINVAL;
7247
7248 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7249 sas.sas_gapcnt = asoc->stats.gapcnt;
7250 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7251 sas.sas_osacks = asoc->stats.osacks;
7252 sas.sas_isacks = asoc->stats.isacks;
7253 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7254 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7255 sas.sas_oodchunks = asoc->stats.oodchunks;
7256 sas.sas_iodchunks = asoc->stats.iodchunks;
7257 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7258 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7259 sas.sas_idupchunks = asoc->stats.idupchunks;
7260 sas.sas_opackets = asoc->stats.opackets;
7261 sas.sas_ipackets = asoc->stats.ipackets;
7262
7263 /* New high max rto observed, will return 0 if not a single
7264 * RTO update took place. obs_rto_ipaddr will be bogus
7265 * in such a case
7266 */
7267 sas.sas_maxrto = asoc->stats.max_obs_rto;
7268 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7269 sizeof(struct sockaddr_storage));
7270
7271 /* Mark beginning of a new observation period */
7272 asoc->stats.max_obs_rto = asoc->rto_min;
7273
7274 if (put_user(len, optlen))
7275 return -EFAULT;
7276
7277 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7278
7279 if (copy_to_user(optval, &sas, len))
7280 return -EFAULT;
7281
7282 return 0;
7283}
7284
7285static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7286 char __user *optval,
7287 int __user *optlen)
7288{
7289 int val = 0;
7290
7291 if (len < sizeof(int))
7292 return -EINVAL;
7293
7294 len = sizeof(int);
7295 if (sctp_sk(sk)->recvrcvinfo)
7296 val = 1;
7297 if (put_user(len, optlen))
7298 return -EFAULT;
7299 if (copy_to_user(optval, &val, len))
7300 return -EFAULT;
7301
7302 return 0;
7303}
7304
7305static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7306 char __user *optval,
7307 int __user *optlen)
7308{
7309 int val = 0;
7310
7311 if (len < sizeof(int))
7312 return -EINVAL;
7313
7314 len = sizeof(int);
7315 if (sctp_sk(sk)->recvnxtinfo)
7316 val = 1;
7317 if (put_user(len, optlen))
7318 return -EFAULT;
7319 if (copy_to_user(optval, &val, len))
7320 return -EFAULT;
7321
7322 return 0;
7323}
7324
7325static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7326 char __user *optval,
7327 int __user *optlen)
7328{
7329 struct sctp_assoc_value params;
7330 struct sctp_association *asoc;
7331 int retval = -EFAULT;
7332
7333 if (len < sizeof(params)) {
7334 retval = -EINVAL;
7335 goto out;
7336 }
7337
7338 len = sizeof(params);
7339 if (copy_from_user(¶ms, optval, len))
7340 goto out;
7341
7342 asoc = sctp_id2assoc(sk, params.assoc_id);
7343 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7344 sctp_style(sk, UDP)) {
7345 retval = -EINVAL;
7346 goto out;
7347 }
7348
7349 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7350 : sctp_sk(sk)->ep->prsctp_enable;
7351
7352 if (put_user(len, optlen))
7353 goto out;
7354
7355 if (copy_to_user(optval, ¶ms, len))
7356 goto out;
7357
7358 retval = 0;
7359
7360out:
7361 return retval;
7362}
7363
7364static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7365 char __user *optval,
7366 int __user *optlen)
7367{
7368 struct sctp_default_prinfo info;
7369 struct sctp_association *asoc;
7370 int retval = -EFAULT;
7371
7372 if (len < sizeof(info)) {
7373 retval = -EINVAL;
7374 goto out;
7375 }
7376
7377 len = sizeof(info);
7378 if (copy_from_user(&info, optval, len))
7379 goto out;
7380
7381 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7382 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7383 sctp_style(sk, UDP)) {
7384 retval = -EINVAL;
7385 goto out;
7386 }
7387
7388 if (asoc) {
7389 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7390 info.pr_value = asoc->default_timetolive;
7391 } else {
7392 struct sctp_sock *sp = sctp_sk(sk);
7393
7394 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7395 info.pr_value = sp->default_timetolive;
7396 }
7397
7398 if (put_user(len, optlen))
7399 goto out;
7400
7401 if (copy_to_user(optval, &info, len))
7402 goto out;
7403
7404 retval = 0;
7405
7406out:
7407 return retval;
7408}
7409
7410static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7411 char __user *optval,
7412 int __user *optlen)
7413{
7414 struct sctp_prstatus params;
7415 struct sctp_association *asoc;
7416 int policy;
7417 int retval = -EINVAL;
7418
7419 if (len < sizeof(params))
7420 goto out;
7421
7422 len = sizeof(params);
7423 if (copy_from_user(¶ms, optval, len)) {
7424 retval = -EFAULT;
7425 goto out;
7426 }
7427
7428 policy = params.sprstat_policy;
7429 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7430 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7431 goto out;
7432
7433 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7434 if (!asoc)
7435 goto out;
7436
7437 if (policy == SCTP_PR_SCTP_ALL) {
7438 params.sprstat_abandoned_unsent = 0;
7439 params.sprstat_abandoned_sent = 0;
7440 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7441 params.sprstat_abandoned_unsent +=
7442 asoc->abandoned_unsent[policy];
7443 params.sprstat_abandoned_sent +=
7444 asoc->abandoned_sent[policy];
7445 }
7446 } else {
7447 params.sprstat_abandoned_unsent =
7448 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7449 params.sprstat_abandoned_sent =
7450 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7451 }
7452
7453 if (put_user(len, optlen)) {
7454 retval = -EFAULT;
7455 goto out;
7456 }
7457
7458 if (copy_to_user(optval, ¶ms, len)) {
7459 retval = -EFAULT;
7460 goto out;
7461 }
7462
7463 retval = 0;
7464
7465out:
7466 return retval;
7467}
7468
7469static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7470 char __user *optval,
7471 int __user *optlen)
7472{
7473 struct sctp_stream_out_ext *streamoute;
7474 struct sctp_association *asoc;
7475 struct sctp_prstatus params;
7476 int retval = -EINVAL;
7477 int policy;
7478
7479 if (len < sizeof(params))
7480 goto out;
7481
7482 len = sizeof(params);
7483 if (copy_from_user(¶ms, optval, len)) {
7484 retval = -EFAULT;
7485 goto out;
7486 }
7487
7488 policy = params.sprstat_policy;
7489 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7490 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7491 goto out;
7492
7493 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7494 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7495 goto out;
7496
7497 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7498 if (!streamoute) {
7499 /* Not allocated yet, means all stats are 0 */
7500 params.sprstat_abandoned_unsent = 0;
7501 params.sprstat_abandoned_sent = 0;
7502 retval = 0;
7503 goto out;
7504 }
7505
7506 if (policy == SCTP_PR_SCTP_ALL) {
7507 params.sprstat_abandoned_unsent = 0;
7508 params.sprstat_abandoned_sent = 0;
7509 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7510 params.sprstat_abandoned_unsent +=
7511 streamoute->abandoned_unsent[policy];
7512 params.sprstat_abandoned_sent +=
7513 streamoute->abandoned_sent[policy];
7514 }
7515 } else {
7516 params.sprstat_abandoned_unsent =
7517 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7518 params.sprstat_abandoned_sent =
7519 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7520 }
7521
7522 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7523 retval = -EFAULT;
7524 goto out;
7525 }
7526
7527 retval = 0;
7528
7529out:
7530 return retval;
7531}
7532
7533static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7534 char __user *optval,
7535 int __user *optlen)
7536{
7537 struct sctp_assoc_value params;
7538 struct sctp_association *asoc;
7539 int retval = -EFAULT;
7540
7541 if (len < sizeof(params)) {
7542 retval = -EINVAL;
7543 goto out;
7544 }
7545
7546 len = sizeof(params);
7547 if (copy_from_user(¶ms, optval, len))
7548 goto out;
7549
7550 asoc = sctp_id2assoc(sk, params.assoc_id);
7551 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7552 sctp_style(sk, UDP)) {
7553 retval = -EINVAL;
7554 goto out;
7555 }
7556
7557 params.assoc_value = asoc ? asoc->peer.reconf_capable
7558 : sctp_sk(sk)->ep->reconf_enable;
7559
7560 if (put_user(len, optlen))
7561 goto out;
7562
7563 if (copy_to_user(optval, ¶ms, len))
7564 goto out;
7565
7566 retval = 0;
7567
7568out:
7569 return retval;
7570}
7571
7572static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7573 char __user *optval,
7574 int __user *optlen)
7575{
7576 struct sctp_assoc_value params;
7577 struct sctp_association *asoc;
7578 int retval = -EFAULT;
7579
7580 if (len < sizeof(params)) {
7581 retval = -EINVAL;
7582 goto out;
7583 }
7584
7585 len = sizeof(params);
7586 if (copy_from_user(¶ms, optval, len))
7587 goto out;
7588
7589 asoc = sctp_id2assoc(sk, params.assoc_id);
7590 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7591 sctp_style(sk, UDP)) {
7592 retval = -EINVAL;
7593 goto out;
7594 }
7595
7596 params.assoc_value = asoc ? asoc->strreset_enable
7597 : sctp_sk(sk)->ep->strreset_enable;
7598
7599 if (put_user(len, optlen))
7600 goto out;
7601
7602 if (copy_to_user(optval, ¶ms, len))
7603 goto out;
7604
7605 retval = 0;
7606
7607out:
7608 return retval;
7609}
7610
7611static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7612 char __user *optval,
7613 int __user *optlen)
7614{
7615 struct sctp_assoc_value params;
7616 struct sctp_association *asoc;
7617 int retval = -EFAULT;
7618
7619 if (len < sizeof(params)) {
7620 retval = -EINVAL;
7621 goto out;
7622 }
7623
7624 len = sizeof(params);
7625 if (copy_from_user(¶ms, optval, len))
7626 goto out;
7627
7628 asoc = sctp_id2assoc(sk, params.assoc_id);
7629 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7630 sctp_style(sk, UDP)) {
7631 retval = -EINVAL;
7632 goto out;
7633 }
7634
7635 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7636 : sctp_sk(sk)->default_ss;
7637
7638 if (put_user(len, optlen))
7639 goto out;
7640
7641 if (copy_to_user(optval, ¶ms, len))
7642 goto out;
7643
7644 retval = 0;
7645
7646out:
7647 return retval;
7648}
7649
7650static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7651 char __user *optval,
7652 int __user *optlen)
7653{
7654 struct sctp_stream_value params;
7655 struct sctp_association *asoc;
7656 int retval = -EFAULT;
7657
7658 if (len < sizeof(params)) {
7659 retval = -EINVAL;
7660 goto out;
7661 }
7662
7663 len = sizeof(params);
7664 if (copy_from_user(¶ms, optval, len))
7665 goto out;
7666
7667 asoc = sctp_id2assoc(sk, params.assoc_id);
7668 if (!asoc) {
7669 retval = -EINVAL;
7670 goto out;
7671 }
7672
7673 retval = sctp_sched_get_value(asoc, params.stream_id,
7674 ¶ms.stream_value);
7675 if (retval)
7676 goto out;
7677
7678 if (put_user(len, optlen)) {
7679 retval = -EFAULT;
7680 goto out;
7681 }
7682
7683 if (copy_to_user(optval, ¶ms, len)) {
7684 retval = -EFAULT;
7685 goto out;
7686 }
7687
7688out:
7689 return retval;
7690}
7691
7692static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7693 char __user *optval,
7694 int __user *optlen)
7695{
7696 struct sctp_assoc_value params;
7697 struct sctp_association *asoc;
7698 int retval = -EFAULT;
7699
7700 if (len < sizeof(params)) {
7701 retval = -EINVAL;
7702 goto out;
7703 }
7704
7705 len = sizeof(params);
7706 if (copy_from_user(¶ms, optval, len))
7707 goto out;
7708
7709 asoc = sctp_id2assoc(sk, params.assoc_id);
7710 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7711 sctp_style(sk, UDP)) {
7712 retval = -EINVAL;
7713 goto out;
7714 }
7715
7716 params.assoc_value = asoc ? asoc->peer.intl_capable
7717 : sctp_sk(sk)->ep->intl_enable;
7718
7719 if (put_user(len, optlen))
7720 goto out;
7721
7722 if (copy_to_user(optval, ¶ms, len))
7723 goto out;
7724
7725 retval = 0;
7726
7727out:
7728 return retval;
7729}
7730
7731static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7732 char __user *optval,
7733 int __user *optlen)
7734{
7735 int val;
7736
7737 if (len < sizeof(int))
7738 return -EINVAL;
7739
7740 len = sizeof(int);
7741 val = sctp_sk(sk)->reuse;
7742 if (put_user(len, optlen))
7743 return -EFAULT;
7744
7745 if (copy_to_user(optval, &val, len))
7746 return -EFAULT;
7747
7748 return 0;
7749}
7750
7751static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7752 int __user *optlen)
7753{
7754 struct sctp_association *asoc;
7755 struct sctp_event param;
7756 __u16 subscribe;
7757
7758 if (len < sizeof(param))
7759 return -EINVAL;
7760
7761 len = sizeof(param);
7762 if (copy_from_user(¶m, optval, len))
7763 return -EFAULT;
7764
7765 if (param.se_type < SCTP_SN_TYPE_BASE ||
7766 param.se_type > SCTP_SN_TYPE_MAX)
7767 return -EINVAL;
7768
7769 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7770 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7771 sctp_style(sk, UDP))
7772 return -EINVAL;
7773
7774 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7775 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7776
7777 if (put_user(len, optlen))
7778 return -EFAULT;
7779
7780 if (copy_to_user(optval, ¶m, len))
7781 return -EFAULT;
7782
7783 return 0;
7784}
7785
7786static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7787 char __user *optval,
7788 int __user *optlen)
7789{
7790 struct sctp_assoc_value params;
7791 struct sctp_association *asoc;
7792 int retval = -EFAULT;
7793
7794 if (len < sizeof(params)) {
7795 retval = -EINVAL;
7796 goto out;
7797 }
7798
7799 len = sizeof(params);
7800 if (copy_from_user(¶ms, optval, len))
7801 goto out;
7802
7803 asoc = sctp_id2assoc(sk, params.assoc_id);
7804 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7805 sctp_style(sk, UDP)) {
7806 retval = -EINVAL;
7807 goto out;
7808 }
7809
7810 params.assoc_value = asoc ? asoc->peer.asconf_capable
7811 : sctp_sk(sk)->ep->asconf_enable;
7812
7813 if (put_user(len, optlen))
7814 goto out;
7815
7816 if (copy_to_user(optval, ¶ms, len))
7817 goto out;
7818
7819 retval = 0;
7820
7821out:
7822 return retval;
7823}
7824
7825static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7826 char __user *optval,
7827 int __user *optlen)
7828{
7829 struct sctp_assoc_value params;
7830 struct sctp_association *asoc;
7831 int retval = -EFAULT;
7832
7833 if (len < sizeof(params)) {
7834 retval = -EINVAL;
7835 goto out;
7836 }
7837
7838 len = sizeof(params);
7839 if (copy_from_user(¶ms, optval, len))
7840 goto out;
7841
7842 asoc = sctp_id2assoc(sk, params.assoc_id);
7843 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7844 sctp_style(sk, UDP)) {
7845 retval = -EINVAL;
7846 goto out;
7847 }
7848
7849 params.assoc_value = asoc ? asoc->peer.auth_capable
7850 : sctp_sk(sk)->ep->auth_enable;
7851
7852 if (put_user(len, optlen))
7853 goto out;
7854
7855 if (copy_to_user(optval, ¶ms, len))
7856 goto out;
7857
7858 retval = 0;
7859
7860out:
7861 return retval;
7862}
7863
7864static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7865 char __user *optval,
7866 int __user *optlen)
7867{
7868 struct sctp_assoc_value params;
7869 struct sctp_association *asoc;
7870 int retval = -EFAULT;
7871
7872 if (len < sizeof(params)) {
7873 retval = -EINVAL;
7874 goto out;
7875 }
7876
7877 len = sizeof(params);
7878 if (copy_from_user(¶ms, optval, len))
7879 goto out;
7880
7881 asoc = sctp_id2assoc(sk, params.assoc_id);
7882 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7883 sctp_style(sk, UDP)) {
7884 retval = -EINVAL;
7885 goto out;
7886 }
7887
7888 params.assoc_value = asoc ? asoc->peer.ecn_capable
7889 : sctp_sk(sk)->ep->ecn_enable;
7890
7891 if (put_user(len, optlen))
7892 goto out;
7893
7894 if (copy_to_user(optval, ¶ms, len))
7895 goto out;
7896
7897 retval = 0;
7898
7899out:
7900 return retval;
7901}
7902
7903static int sctp_getsockopt(struct sock *sk, int level, int optname,
7904 char __user *optval, int __user *optlen)
7905{
7906 int retval = 0;
7907 int len;
7908
7909 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7910
7911 /* I can hardly begin to describe how wrong this is. This is
7912 * so broken as to be worse than useless. The API draft
7913 * REALLY is NOT helpful here... I am not convinced that the
7914 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7915 * are at all well-founded.
7916 */
7917 if (level != SOL_SCTP) {
7918 struct sctp_af *af = sctp_sk(sk)->pf->af;
7919
7920 retval = af->getsockopt(sk, level, optname, optval, optlen);
7921 return retval;
7922 }
7923
7924 if (get_user(len, optlen))
7925 return -EFAULT;
7926
7927 if (len < 0)
7928 return -EINVAL;
7929
7930 lock_sock(sk);
7931
7932 switch (optname) {
7933 case SCTP_STATUS:
7934 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7935 break;
7936 case SCTP_DISABLE_FRAGMENTS:
7937 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7938 optlen);
7939 break;
7940 case SCTP_EVENTS:
7941 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7942 break;
7943 case SCTP_AUTOCLOSE:
7944 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7945 break;
7946 case SCTP_SOCKOPT_PEELOFF:
7947 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7948 break;
7949 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7950 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7951 break;
7952 case SCTP_PEER_ADDR_PARAMS:
7953 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7954 optlen);
7955 break;
7956 case SCTP_DELAYED_SACK:
7957 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7958 optlen);
7959 break;
7960 case SCTP_INITMSG:
7961 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7962 break;
7963 case SCTP_GET_PEER_ADDRS:
7964 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7965 optlen);
7966 break;
7967 case SCTP_GET_LOCAL_ADDRS:
7968 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7969 optlen);
7970 break;
7971 case SCTP_SOCKOPT_CONNECTX3:
7972 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7973 break;
7974 case SCTP_DEFAULT_SEND_PARAM:
7975 retval = sctp_getsockopt_default_send_param(sk, len,
7976 optval, optlen);
7977 break;
7978 case SCTP_DEFAULT_SNDINFO:
7979 retval = sctp_getsockopt_default_sndinfo(sk, len,
7980 optval, optlen);
7981 break;
7982 case SCTP_PRIMARY_ADDR:
7983 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7984 break;
7985 case SCTP_NODELAY:
7986 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7987 break;
7988 case SCTP_RTOINFO:
7989 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7990 break;
7991 case SCTP_ASSOCINFO:
7992 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7993 break;
7994 case SCTP_I_WANT_MAPPED_V4_ADDR:
7995 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7996 break;
7997 case SCTP_MAXSEG:
7998 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7999 break;
8000 case SCTP_GET_PEER_ADDR_INFO:
8001 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8002 optlen);
8003 break;
8004 case SCTP_ADAPTATION_LAYER:
8005 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8006 optlen);
8007 break;
8008 case SCTP_CONTEXT:
8009 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8010 break;
8011 case SCTP_FRAGMENT_INTERLEAVE:
8012 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8013 optlen);
8014 break;
8015 case SCTP_PARTIAL_DELIVERY_POINT:
8016 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8017 optlen);
8018 break;
8019 case SCTP_MAX_BURST:
8020 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8021 break;
8022 case SCTP_AUTH_KEY:
8023 case SCTP_AUTH_CHUNK:
8024 case SCTP_AUTH_DELETE_KEY:
8025 case SCTP_AUTH_DEACTIVATE_KEY:
8026 retval = -EOPNOTSUPP;
8027 break;
8028 case SCTP_HMAC_IDENT:
8029 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8030 break;
8031 case SCTP_AUTH_ACTIVE_KEY:
8032 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8033 break;
8034 case SCTP_PEER_AUTH_CHUNKS:
8035 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8036 optlen);
8037 break;
8038 case SCTP_LOCAL_AUTH_CHUNKS:
8039 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8040 optlen);
8041 break;
8042 case SCTP_GET_ASSOC_NUMBER:
8043 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8044 break;
8045 case SCTP_GET_ASSOC_ID_LIST:
8046 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8047 break;
8048 case SCTP_AUTO_ASCONF:
8049 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8050 break;
8051 case SCTP_PEER_ADDR_THLDS:
8052 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
8053 break;
8054 case SCTP_GET_ASSOC_STATS:
8055 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8056 break;
8057 case SCTP_RECVRCVINFO:
8058 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8059 break;
8060 case SCTP_RECVNXTINFO:
8061 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8062 break;
8063 case SCTP_PR_SUPPORTED:
8064 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8065 break;
8066 case SCTP_DEFAULT_PRINFO:
8067 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8068 optlen);
8069 break;
8070 case SCTP_PR_ASSOC_STATUS:
8071 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8072 optlen);
8073 break;
8074 case SCTP_PR_STREAM_STATUS:
8075 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8076 optlen);
8077 break;
8078 case SCTP_RECONFIG_SUPPORTED:
8079 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8080 optlen);
8081 break;
8082 case SCTP_ENABLE_STREAM_RESET:
8083 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8084 optlen);
8085 break;
8086 case SCTP_STREAM_SCHEDULER:
8087 retval = sctp_getsockopt_scheduler(sk, len, optval,
8088 optlen);
8089 break;
8090 case SCTP_STREAM_SCHEDULER_VALUE:
8091 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8092 optlen);
8093 break;
8094 case SCTP_INTERLEAVING_SUPPORTED:
8095 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8096 optlen);
8097 break;
8098 case SCTP_REUSE_PORT:
8099 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8100 break;
8101 case SCTP_EVENT:
8102 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8103 break;
8104 case SCTP_ASCONF_SUPPORTED:
8105 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8106 optlen);
8107 break;
8108 case SCTP_AUTH_SUPPORTED:
8109 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8110 optlen);
8111 break;
8112 case SCTP_ECN_SUPPORTED:
8113 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8114 break;
8115 default:
8116 retval = -ENOPROTOOPT;
8117 break;
8118 }
8119
8120 release_sock(sk);
8121 return retval;
8122}
8123
8124static int sctp_hash(struct sock *sk)
8125{
8126 /* STUB */
8127 return 0;
8128}
8129
8130static void sctp_unhash(struct sock *sk)
8131{
8132 /* STUB */
8133}
8134
8135/* Check if port is acceptable. Possibly find first available port.
8136 *
8137 * The port hash table (contained in the 'global' SCTP protocol storage
8138 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8139 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8140 * list (the list number is the port number hashed out, so as you
8141 * would expect from a hash function, all the ports in a given list have
8142 * such a number that hashes out to the same list number; you were
8143 * expecting that, right?); so each list has a set of ports, with a
8144 * link to the socket (struct sock) that uses it, the port number and
8145 * a fastreuse flag (FIXME: NPI ipg).
8146 */
8147static struct sctp_bind_bucket *sctp_bucket_create(
8148 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8149
8150static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8151{
8152 struct sctp_sock *sp = sctp_sk(sk);
8153 bool reuse = (sk->sk_reuse || sp->reuse);
8154 struct sctp_bind_hashbucket *head; /* hash list */
8155 kuid_t uid = sock_i_uid(sk);
8156 struct sctp_bind_bucket *pp;
8157 unsigned short snum;
8158 int ret;
8159
8160 snum = ntohs(addr->v4.sin_port);
8161
8162 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8163
8164 local_bh_disable();
8165
8166 if (snum == 0) {
8167 /* Search for an available port. */
8168 int low, high, remaining, index;
8169 unsigned int rover;
8170 struct net *net = sock_net(sk);
8171
8172 inet_get_local_port_range(net, &low, &high);
8173 remaining = (high - low) + 1;
8174 rover = prandom_u32() % remaining + low;
8175
8176 do {
8177 rover++;
8178 if ((rover < low) || (rover > high))
8179 rover = low;
8180 if (inet_is_local_reserved_port(net, rover))
8181 continue;
8182 index = sctp_phashfn(sock_net(sk), rover);
8183 head = &sctp_port_hashtable[index];
8184 spin_lock(&head->lock);
8185 sctp_for_each_hentry(pp, &head->chain)
8186 if ((pp->port == rover) &&
8187 net_eq(sock_net(sk), pp->net))
8188 goto next;
8189 break;
8190 next:
8191 spin_unlock(&head->lock);
8192 } while (--remaining > 0);
8193
8194 /* Exhausted local port range during search? */
8195 ret = 1;
8196 if (remaining <= 0)
8197 goto fail;
8198
8199 /* OK, here is the one we will use. HEAD (the port
8200 * hash table list entry) is non-NULL and we hold it's
8201 * mutex.
8202 */
8203 snum = rover;
8204 } else {
8205 /* We are given an specific port number; we verify
8206 * that it is not being used. If it is used, we will
8207 * exahust the search in the hash list corresponding
8208 * to the port number (snum) - we detect that with the
8209 * port iterator, pp being NULL.
8210 */
8211 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
8212 spin_lock(&head->lock);
8213 sctp_for_each_hentry(pp, &head->chain) {
8214 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
8215 goto pp_found;
8216 }
8217 }
8218 pp = NULL;
8219 goto pp_not_found;
8220pp_found:
8221 if (!hlist_empty(&pp->owner)) {
8222 /* We had a port hash table hit - there is an
8223 * available port (pp != NULL) and it is being
8224 * used by other socket (pp->owner not empty); that other
8225 * socket is going to be sk2.
8226 */
8227 struct sock *sk2;
8228
8229 pr_debug("%s: found a possible match\n", __func__);
8230
8231 if ((pp->fastreuse && reuse &&
8232 sk->sk_state != SCTP_SS_LISTENING) ||
8233 (pp->fastreuseport && sk->sk_reuseport &&
8234 uid_eq(pp->fastuid, uid)))
8235 goto success;
8236
8237 /* Run through the list of sockets bound to the port
8238 * (pp->port) [via the pointers bind_next and
8239 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8240 * we get the endpoint they describe and run through
8241 * the endpoint's list of IP (v4 or v6) addresses,
8242 * comparing each of the addresses with the address of
8243 * the socket sk. If we find a match, then that means
8244 * that this port/socket (sk) combination are already
8245 * in an endpoint.
8246 */
8247 sk_for_each_bound(sk2, &pp->owner) {
8248 struct sctp_sock *sp2 = sctp_sk(sk2);
8249 struct sctp_endpoint *ep2 = sp2->ep;
8250
8251 if (sk == sk2 ||
8252 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8253 sk2->sk_state != SCTP_SS_LISTENING) ||
8254 (sk->sk_reuseport && sk2->sk_reuseport &&
8255 uid_eq(uid, sock_i_uid(sk2))))
8256 continue;
8257
8258 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8259 addr, sp2, sp)) {
8260 ret = 1;
8261 goto fail_unlock;
8262 }
8263 }
8264
8265 pr_debug("%s: found a match\n", __func__);
8266 }
8267pp_not_found:
8268 /* If there was a hash table miss, create a new port. */
8269 ret = 1;
8270 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
8271 goto fail_unlock;
8272
8273 /* In either case (hit or miss), make sure fastreuse is 1 only
8274 * if sk->sk_reuse is too (that is, if the caller requested
8275 * SO_REUSEADDR on this socket -sk-).
8276 */
8277 if (hlist_empty(&pp->owner)) {
8278 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8279 pp->fastreuse = 1;
8280 else
8281 pp->fastreuse = 0;
8282
8283 if (sk->sk_reuseport) {
8284 pp->fastreuseport = 1;
8285 pp->fastuid = uid;
8286 } else {
8287 pp->fastreuseport = 0;
8288 }
8289 } else {
8290 if (pp->fastreuse &&
8291 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8292 pp->fastreuse = 0;
8293
8294 if (pp->fastreuseport &&
8295 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8296 pp->fastreuseport = 0;
8297 }
8298
8299 /* We are set, so fill up all the data in the hash table
8300 * entry, tie the socket list information with the rest of the
8301 * sockets FIXME: Blurry, NPI (ipg).
8302 */
8303success:
8304 if (!sp->bind_hash) {
8305 inet_sk(sk)->inet_num = snum;
8306 sk_add_bind_node(sk, &pp->owner);
8307 sp->bind_hash = pp;
8308 }
8309 ret = 0;
8310
8311fail_unlock:
8312 spin_unlock(&head->lock);
8313
8314fail:
8315 local_bh_enable();
8316 return ret;
8317}
8318
8319/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8320 * port is requested.
8321 */
8322static int sctp_get_port(struct sock *sk, unsigned short snum)
8323{
8324 union sctp_addr addr;
8325 struct sctp_af *af = sctp_sk(sk)->pf->af;
8326
8327 /* Set up a dummy address struct from the sk. */
8328 af->from_sk(&addr, sk);
8329 addr.v4.sin_port = htons(snum);
8330
8331 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8332 return sctp_get_port_local(sk, &addr);
8333}
8334
8335/*
8336 * Move a socket to LISTENING state.
8337 */
8338static int sctp_listen_start(struct sock *sk, int backlog)
8339{
8340 struct sctp_sock *sp = sctp_sk(sk);
8341 struct sctp_endpoint *ep = sp->ep;
8342 struct crypto_shash *tfm = NULL;
8343 char alg[32];
8344
8345 /* Allocate HMAC for generating cookie. */
8346 if (!sp->hmac && sp->sctp_hmac_alg) {
8347 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8348 tfm = crypto_alloc_shash(alg, 0, 0);
8349 if (IS_ERR(tfm)) {
8350 net_info_ratelimited("failed to load transform for %s: %ld\n",
8351 sp->sctp_hmac_alg, PTR_ERR(tfm));
8352 return -ENOSYS;
8353 }
8354 sctp_sk(sk)->hmac = tfm;
8355 }
8356
8357 /*
8358 * If a bind() or sctp_bindx() is not called prior to a listen()
8359 * call that allows new associations to be accepted, the system
8360 * picks an ephemeral port and will choose an address set equivalent
8361 * to binding with a wildcard address.
8362 *
8363 * This is not currently spelled out in the SCTP sockets
8364 * extensions draft, but follows the practice as seen in TCP
8365 * sockets.
8366 *
8367 */
8368 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8369 if (!ep->base.bind_addr.port) {
8370 if (sctp_autobind(sk))
8371 return -EAGAIN;
8372 } else {
8373 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8374 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8375 return -EADDRINUSE;
8376 }
8377 }
8378
8379 sk->sk_max_ack_backlog = backlog;
8380 return sctp_hash_endpoint(ep);
8381}
8382
8383/*
8384 * 4.1.3 / 5.1.3 listen()
8385 *
8386 * By default, new associations are not accepted for UDP style sockets.
8387 * An application uses listen() to mark a socket as being able to
8388 * accept new associations.
8389 *
8390 * On TCP style sockets, applications use listen() to ready the SCTP
8391 * endpoint for accepting inbound associations.
8392 *
8393 * On both types of endpoints a backlog of '0' disables listening.
8394 *
8395 * Move a socket to LISTENING state.
8396 */
8397int sctp_inet_listen(struct socket *sock, int backlog)
8398{
8399 struct sock *sk = sock->sk;
8400 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8401 int err = -EINVAL;
8402
8403 if (unlikely(backlog < 0))
8404 return err;
8405
8406 lock_sock(sk);
8407
8408 /* Peeled-off sockets are not allowed to listen(). */
8409 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8410 goto out;
8411
8412 if (sock->state != SS_UNCONNECTED)
8413 goto out;
8414
8415 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8416 goto out;
8417
8418 /* If backlog is zero, disable listening. */
8419 if (!backlog) {
8420 if (sctp_sstate(sk, CLOSED))
8421 goto out;
8422
8423 err = 0;
8424 sctp_unhash_endpoint(ep);
8425 sk->sk_state = SCTP_SS_CLOSED;
8426 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8427 sctp_sk(sk)->bind_hash->fastreuse = 1;
8428 goto out;
8429 }
8430
8431 /* If we are already listening, just update the backlog */
8432 if (sctp_sstate(sk, LISTENING))
8433 sk->sk_max_ack_backlog = backlog;
8434 else {
8435 err = sctp_listen_start(sk, backlog);
8436 if (err)
8437 goto out;
8438 }
8439
8440 err = 0;
8441out:
8442 release_sock(sk);
8443 return err;
8444}
8445
8446/*
8447 * This function is done by modeling the current datagram_poll() and the
8448 * tcp_poll(). Note that, based on these implementations, we don't
8449 * lock the socket in this function, even though it seems that,
8450 * ideally, locking or some other mechanisms can be used to ensure
8451 * the integrity of the counters (sndbuf and wmem_alloc) used
8452 * in this place. We assume that we don't need locks either until proven
8453 * otherwise.
8454 *
8455 * Another thing to note is that we include the Async I/O support
8456 * here, again, by modeling the current TCP/UDP code. We don't have
8457 * a good way to test with it yet.
8458 */
8459__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8460{
8461 struct sock *sk = sock->sk;
8462 struct sctp_sock *sp = sctp_sk(sk);
8463 __poll_t mask;
8464
8465 poll_wait(file, sk_sleep(sk), wait);
8466
8467 sock_rps_record_flow(sk);
8468
8469 /* A TCP-style listening socket becomes readable when the accept queue
8470 * is not empty.
8471 */
8472 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8473 return (!list_empty(&sp->ep->asocs)) ?
8474 (EPOLLIN | EPOLLRDNORM) : 0;
8475
8476 mask = 0;
8477
8478 /* Is there any exceptional events? */
8479 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8480 mask |= EPOLLERR |
8481 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8482 if (sk->sk_shutdown & RCV_SHUTDOWN)
8483 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8484 if (sk->sk_shutdown == SHUTDOWN_MASK)
8485 mask |= EPOLLHUP;
8486
8487 /* Is it readable? Reconsider this code with TCP-style support. */
8488 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8489 mask |= EPOLLIN | EPOLLRDNORM;
8490
8491 /* The association is either gone or not ready. */
8492 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8493 return mask;
8494
8495 /* Is it writable? */
8496 if (sctp_writeable(sk)) {
8497 mask |= EPOLLOUT | EPOLLWRNORM;
8498 } else {
8499 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8500 /*
8501 * Since the socket is not locked, the buffer
8502 * might be made available after the writeable check and
8503 * before the bit is set. This could cause a lost I/O
8504 * signal. tcp_poll() has a race breaker for this race
8505 * condition. Based on their implementation, we put
8506 * in the following code to cover it as well.
8507 */
8508 if (sctp_writeable(sk))
8509 mask |= EPOLLOUT | EPOLLWRNORM;
8510 }
8511 return mask;
8512}
8513
8514/********************************************************************
8515 * 2nd Level Abstractions
8516 ********************************************************************/
8517
8518static struct sctp_bind_bucket *sctp_bucket_create(
8519 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8520{
8521 struct sctp_bind_bucket *pp;
8522
8523 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8524 if (pp) {
8525 SCTP_DBG_OBJCNT_INC(bind_bucket);
8526 pp->port = snum;
8527 pp->fastreuse = 0;
8528 INIT_HLIST_HEAD(&pp->owner);
8529 pp->net = net;
8530 hlist_add_head(&pp->node, &head->chain);
8531 }
8532 return pp;
8533}
8534
8535/* Caller must hold hashbucket lock for this tb with local BH disabled */
8536static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8537{
8538 if (pp && hlist_empty(&pp->owner)) {
8539 __hlist_del(&pp->node);
8540 kmem_cache_free(sctp_bucket_cachep, pp);
8541 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8542 }
8543}
8544
8545/* Release this socket's reference to a local port. */
8546static inline void __sctp_put_port(struct sock *sk)
8547{
8548 struct sctp_bind_hashbucket *head =
8549 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8550 inet_sk(sk)->inet_num)];
8551 struct sctp_bind_bucket *pp;
8552
8553 spin_lock(&head->lock);
8554 pp = sctp_sk(sk)->bind_hash;
8555 __sk_del_bind_node(sk);
8556 sctp_sk(sk)->bind_hash = NULL;
8557 inet_sk(sk)->inet_num = 0;
8558 sctp_bucket_destroy(pp);
8559 spin_unlock(&head->lock);
8560}
8561
8562void sctp_put_port(struct sock *sk)
8563{
8564 local_bh_disable();
8565 __sctp_put_port(sk);
8566 local_bh_enable();
8567}
8568
8569/*
8570 * The system picks an ephemeral port and choose an address set equivalent
8571 * to binding with a wildcard address.
8572 * One of those addresses will be the primary address for the association.
8573 * This automatically enables the multihoming capability of SCTP.
8574 */
8575static int sctp_autobind(struct sock *sk)
8576{
8577 union sctp_addr autoaddr;
8578 struct sctp_af *af;
8579 __be16 port;
8580
8581 /* Initialize a local sockaddr structure to INADDR_ANY. */
8582 af = sctp_sk(sk)->pf->af;
8583
8584 port = htons(inet_sk(sk)->inet_num);
8585 af->inaddr_any(&autoaddr, port);
8586
8587 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8588}
8589
8590/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8591 *
8592 * From RFC 2292
8593 * 4.2 The cmsghdr Structure *
8594 *
8595 * When ancillary data is sent or received, any number of ancillary data
8596 * objects can be specified by the msg_control and msg_controllen members of
8597 * the msghdr structure, because each object is preceded by
8598 * a cmsghdr structure defining the object's length (the cmsg_len member).
8599 * Historically Berkeley-derived implementations have passed only one object
8600 * at a time, but this API allows multiple objects to be
8601 * passed in a single call to sendmsg() or recvmsg(). The following example
8602 * shows two ancillary data objects in a control buffer.
8603 *
8604 * |<--------------------------- msg_controllen -------------------------->|
8605 * | |
8606 *
8607 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8608 *
8609 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8610 * | | |
8611 *
8612 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8613 *
8614 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8615 * | | | | |
8616 *
8617 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8618 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8619 *
8620 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8621 *
8622 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8623 * ^
8624 * |
8625 *
8626 * msg_control
8627 * points here
8628 */
8629static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8630{
8631 struct msghdr *my_msg = (struct msghdr *)msg;
8632 struct cmsghdr *cmsg;
8633
8634 for_each_cmsghdr(cmsg, my_msg) {
8635 if (!CMSG_OK(my_msg, cmsg))
8636 return -EINVAL;
8637
8638 /* Should we parse this header or ignore? */
8639 if (cmsg->cmsg_level != IPPROTO_SCTP)
8640 continue;
8641
8642 /* Strictly check lengths following example in SCM code. */
8643 switch (cmsg->cmsg_type) {
8644 case SCTP_INIT:
8645 /* SCTP Socket API Extension
8646 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8647 *
8648 * This cmsghdr structure provides information for
8649 * initializing new SCTP associations with sendmsg().
8650 * The SCTP_INITMSG socket option uses this same data
8651 * structure. This structure is not used for
8652 * recvmsg().
8653 *
8654 * cmsg_level cmsg_type cmsg_data[]
8655 * ------------ ------------ ----------------------
8656 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8657 */
8658 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8659 return -EINVAL;
8660
8661 cmsgs->init = CMSG_DATA(cmsg);
8662 break;
8663
8664 case SCTP_SNDRCV:
8665 /* SCTP Socket API Extension
8666 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8667 *
8668 * This cmsghdr structure specifies SCTP options for
8669 * sendmsg() and describes SCTP header information
8670 * about a received message through recvmsg().
8671 *
8672 * cmsg_level cmsg_type cmsg_data[]
8673 * ------------ ------------ ----------------------
8674 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8675 */
8676 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8677 return -EINVAL;
8678
8679 cmsgs->srinfo = CMSG_DATA(cmsg);
8680
8681 if (cmsgs->srinfo->sinfo_flags &
8682 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8683 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8684 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8685 return -EINVAL;
8686 break;
8687
8688 case SCTP_SNDINFO:
8689 /* SCTP Socket API Extension
8690 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8691 *
8692 * This cmsghdr structure specifies SCTP options for
8693 * sendmsg(). This structure and SCTP_RCVINFO replaces
8694 * SCTP_SNDRCV which has been deprecated.
8695 *
8696 * cmsg_level cmsg_type cmsg_data[]
8697 * ------------ ------------ ---------------------
8698 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8699 */
8700 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8701 return -EINVAL;
8702
8703 cmsgs->sinfo = CMSG_DATA(cmsg);
8704
8705 if (cmsgs->sinfo->snd_flags &
8706 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8707 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8708 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8709 return -EINVAL;
8710 break;
8711 case SCTP_PRINFO:
8712 /* SCTP Socket API Extension
8713 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8714 *
8715 * This cmsghdr structure specifies SCTP options for sendmsg().
8716 *
8717 * cmsg_level cmsg_type cmsg_data[]
8718 * ------------ ------------ ---------------------
8719 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8720 */
8721 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8722 return -EINVAL;
8723
8724 cmsgs->prinfo = CMSG_DATA(cmsg);
8725 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8726 return -EINVAL;
8727
8728 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8729 cmsgs->prinfo->pr_value = 0;
8730 break;
8731 case SCTP_AUTHINFO:
8732 /* SCTP Socket API Extension
8733 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8734 *
8735 * This cmsghdr structure specifies SCTP options for sendmsg().
8736 *
8737 * cmsg_level cmsg_type cmsg_data[]
8738 * ------------ ------------ ---------------------
8739 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8740 */
8741 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8742 return -EINVAL;
8743
8744 cmsgs->authinfo = CMSG_DATA(cmsg);
8745 break;
8746 case SCTP_DSTADDRV4:
8747 case SCTP_DSTADDRV6:
8748 /* SCTP Socket API Extension
8749 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8750 *
8751 * This cmsghdr structure specifies SCTP options for sendmsg().
8752 *
8753 * cmsg_level cmsg_type cmsg_data[]
8754 * ------------ ------------ ---------------------
8755 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8756 * ------------ ------------ ---------------------
8757 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8758 */
8759 cmsgs->addrs_msg = my_msg;
8760 break;
8761 default:
8762 return -EINVAL;
8763 }
8764 }
8765
8766 return 0;
8767}
8768
8769/*
8770 * Wait for a packet..
8771 * Note: This function is the same function as in core/datagram.c
8772 * with a few modifications to make lksctp work.
8773 */
8774static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8775{
8776 int error;
8777 DEFINE_WAIT(wait);
8778
8779 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8780
8781 /* Socket errors? */
8782 error = sock_error(sk);
8783 if (error)
8784 goto out;
8785
8786 if (!skb_queue_empty(&sk->sk_receive_queue))
8787 goto ready;
8788
8789 /* Socket shut down? */
8790 if (sk->sk_shutdown & RCV_SHUTDOWN)
8791 goto out;
8792
8793 /* Sequenced packets can come disconnected. If so we report the
8794 * problem.
8795 */
8796 error = -ENOTCONN;
8797
8798 /* Is there a good reason to think that we may receive some data? */
8799 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8800 goto out;
8801
8802 /* Handle signals. */
8803 if (signal_pending(current))
8804 goto interrupted;
8805
8806 /* Let another process have a go. Since we are going to sleep
8807 * anyway. Note: This may cause odd behaviors if the message
8808 * does not fit in the user's buffer, but this seems to be the
8809 * only way to honor MSG_DONTWAIT realistically.
8810 */
8811 release_sock(sk);
8812 *timeo_p = schedule_timeout(*timeo_p);
8813 lock_sock(sk);
8814
8815ready:
8816 finish_wait(sk_sleep(sk), &wait);
8817 return 0;
8818
8819interrupted:
8820 error = sock_intr_errno(*timeo_p);
8821
8822out:
8823 finish_wait(sk_sleep(sk), &wait);
8824 *err = error;
8825 return error;
8826}
8827
8828/* Receive a datagram.
8829 * Note: This is pretty much the same routine as in core/datagram.c
8830 * with a few changes to make lksctp work.
8831 */
8832struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8833 int noblock, int *err)
8834{
8835 int error;
8836 struct sk_buff *skb;
8837 long timeo;
8838
8839 timeo = sock_rcvtimeo(sk, noblock);
8840
8841 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8842 MAX_SCHEDULE_TIMEOUT);
8843
8844 do {
8845 /* Again only user level code calls this function,
8846 * so nothing interrupt level
8847 * will suddenly eat the receive_queue.
8848 *
8849 * Look at current nfs client by the way...
8850 * However, this function was correct in any case. 8)
8851 */
8852 if (flags & MSG_PEEK) {
8853 skb = skb_peek(&sk->sk_receive_queue);
8854 if (skb)
8855 refcount_inc(&skb->users);
8856 } else {
8857 skb = __skb_dequeue(&sk->sk_receive_queue);
8858 }
8859
8860 if (skb)
8861 return skb;
8862
8863 /* Caller is allowed not to check sk->sk_err before calling. */
8864 error = sock_error(sk);
8865 if (error)
8866 goto no_packet;
8867
8868 if (sk->sk_shutdown & RCV_SHUTDOWN)
8869 break;
8870
8871 if (sk_can_busy_loop(sk)) {
8872 sk_busy_loop(sk, noblock);
8873
8874 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8875 continue;
8876 }
8877
8878 /* User doesn't want to wait. */
8879 error = -EAGAIN;
8880 if (!timeo)
8881 goto no_packet;
8882 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8883
8884 return NULL;
8885
8886no_packet:
8887 *err = error;
8888 return NULL;
8889}
8890
8891/* If sndbuf has changed, wake up per association sndbuf waiters. */
8892static void __sctp_write_space(struct sctp_association *asoc)
8893{
8894 struct sock *sk = asoc->base.sk;
8895
8896 if (sctp_wspace(asoc) <= 0)
8897 return;
8898
8899 if (waitqueue_active(&asoc->wait))
8900 wake_up_interruptible(&asoc->wait);
8901
8902 if (sctp_writeable(sk)) {
8903 struct socket_wq *wq;
8904
8905 rcu_read_lock();
8906 wq = rcu_dereference(sk->sk_wq);
8907 if (wq) {
8908 if (waitqueue_active(&wq->wait))
8909 wake_up_interruptible(&wq->wait);
8910
8911 /* Note that we try to include the Async I/O support
8912 * here by modeling from the current TCP/UDP code.
8913 * We have not tested with it yet.
8914 */
8915 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8916 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8917 }
8918 rcu_read_unlock();
8919 }
8920}
8921
8922static void sctp_wake_up_waiters(struct sock *sk,
8923 struct sctp_association *asoc)
8924{
8925 struct sctp_association *tmp = asoc;
8926
8927 /* We do accounting for the sndbuf space per association,
8928 * so we only need to wake our own association.
8929 */
8930 if (asoc->ep->sndbuf_policy)
8931 return __sctp_write_space(asoc);
8932
8933 /* If association goes down and is just flushing its
8934 * outq, then just normally notify others.
8935 */
8936 if (asoc->base.dead)
8937 return sctp_write_space(sk);
8938
8939 /* Accounting for the sndbuf space is per socket, so we
8940 * need to wake up others, try to be fair and in case of
8941 * other associations, let them have a go first instead
8942 * of just doing a sctp_write_space() call.
8943 *
8944 * Note that we reach sctp_wake_up_waiters() only when
8945 * associations free up queued chunks, thus we are under
8946 * lock and the list of associations on a socket is
8947 * guaranteed not to change.
8948 */
8949 for (tmp = list_next_entry(tmp, asocs); 1;
8950 tmp = list_next_entry(tmp, asocs)) {
8951 /* Manually skip the head element. */
8952 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8953 continue;
8954 /* Wake up association. */
8955 __sctp_write_space(tmp);
8956 /* We've reached the end. */
8957 if (tmp == asoc)
8958 break;
8959 }
8960}
8961
8962/* Do accounting for the sndbuf space.
8963 * Decrement the used sndbuf space of the corresponding association by the
8964 * data size which was just transmitted(freed).
8965 */
8966static void sctp_wfree(struct sk_buff *skb)
8967{
8968 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8969 struct sctp_association *asoc = chunk->asoc;
8970 struct sock *sk = asoc->base.sk;
8971
8972 sk_mem_uncharge(sk, skb->truesize);
8973 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8974 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8975 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8976 &sk->sk_wmem_alloc));
8977
8978 if (chunk->shkey) {
8979 struct sctp_shared_key *shkey = chunk->shkey;
8980
8981 /* refcnt == 2 and !list_empty mean after this release, it's
8982 * not being used anywhere, and it's time to notify userland
8983 * that this shkey can be freed if it's been deactivated.
8984 */
8985 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8986 refcount_read(&shkey->refcnt) == 2) {
8987 struct sctp_ulpevent *ev;
8988
8989 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8990 SCTP_AUTH_FREE_KEY,
8991 GFP_KERNEL);
8992 if (ev)
8993 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8994 }
8995 sctp_auth_shkey_release(chunk->shkey);
8996 }
8997
8998 sock_wfree(skb);
8999 sctp_wake_up_waiters(sk, asoc);
9000
9001 sctp_association_put(asoc);
9002}
9003
9004/* Do accounting for the receive space on the socket.
9005 * Accounting for the association is done in ulpevent.c
9006 * We set this as a destructor for the cloned data skbs so that
9007 * accounting is done at the correct time.
9008 */
9009void sctp_sock_rfree(struct sk_buff *skb)
9010{
9011 struct sock *sk = skb->sk;
9012 struct sctp_ulpevent *event = sctp_skb2event(skb);
9013
9014 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9015
9016 /*
9017 * Mimic the behavior of sock_rfree
9018 */
9019 sk_mem_uncharge(sk, event->rmem_len);
9020}
9021
9022
9023/* Helper function to wait for space in the sndbuf. */
9024static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9025 size_t msg_len)
9026{
9027 struct sock *sk = asoc->base.sk;
9028 long current_timeo = *timeo_p;
9029 DEFINE_WAIT(wait);
9030 int err = 0;
9031
9032 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9033 *timeo_p, msg_len);
9034
9035 /* Increment the association's refcnt. */
9036 sctp_association_hold(asoc);
9037
9038 /* Wait on the association specific sndbuf space. */
9039 for (;;) {
9040 prepare_to_wait_exclusive(&asoc->wait, &wait,
9041 TASK_INTERRUPTIBLE);
9042 if (asoc->base.dead)
9043 goto do_dead;
9044 if (!*timeo_p)
9045 goto do_nonblock;
9046 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9047 goto do_error;
9048 if (signal_pending(current))
9049 goto do_interrupted;
9050 if (sk_under_memory_pressure(sk))
9051 sk_mem_reclaim(sk);
9052 if ((int)msg_len <= sctp_wspace(asoc) &&
9053 sk_wmem_schedule(sk, msg_len))
9054 break;
9055
9056 /* Let another process have a go. Since we are going
9057 * to sleep anyway.
9058 */
9059 release_sock(sk);
9060 current_timeo = schedule_timeout(current_timeo);
9061 lock_sock(sk);
9062 if (sk != asoc->base.sk)
9063 goto do_error;
9064
9065 *timeo_p = current_timeo;
9066 }
9067
9068out:
9069 finish_wait(&asoc->wait, &wait);
9070
9071 /* Release the association's refcnt. */
9072 sctp_association_put(asoc);
9073
9074 return err;
9075
9076do_dead:
9077 err = -ESRCH;
9078 goto out;
9079
9080do_error:
9081 err = -EPIPE;
9082 goto out;
9083
9084do_interrupted:
9085 err = sock_intr_errno(*timeo_p);
9086 goto out;
9087
9088do_nonblock:
9089 err = -EAGAIN;
9090 goto out;
9091}
9092
9093void sctp_data_ready(struct sock *sk)
9094{
9095 struct socket_wq *wq;
9096
9097 rcu_read_lock();
9098 wq = rcu_dereference(sk->sk_wq);
9099 if (skwq_has_sleeper(wq))
9100 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9101 EPOLLRDNORM | EPOLLRDBAND);
9102 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9103 rcu_read_unlock();
9104}
9105
9106/* If socket sndbuf has changed, wake up all per association waiters. */
9107void sctp_write_space(struct sock *sk)
9108{
9109 struct sctp_association *asoc;
9110
9111 /* Wake up the tasks in each wait queue. */
9112 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9113 __sctp_write_space(asoc);
9114 }
9115}
9116
9117/* Is there any sndbuf space available on the socket?
9118 *
9119 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9120 * associations on the same socket. For a UDP-style socket with
9121 * multiple associations, it is possible for it to be "unwriteable"
9122 * prematurely. I assume that this is acceptable because
9123 * a premature "unwriteable" is better than an accidental "writeable" which
9124 * would cause an unwanted block under certain circumstances. For the 1-1
9125 * UDP-style sockets or TCP-style sockets, this code should work.
9126 * - Daisy
9127 */
9128static bool sctp_writeable(struct sock *sk)
9129{
9130 return sk->sk_sndbuf > sk->sk_wmem_queued;
9131}
9132
9133/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9134 * returns immediately with EINPROGRESS.
9135 */
9136static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9137{
9138 struct sock *sk = asoc->base.sk;
9139 int err = 0;
9140 long current_timeo = *timeo_p;
9141 DEFINE_WAIT(wait);
9142
9143 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9144
9145 /* Increment the association's refcnt. */
9146 sctp_association_hold(asoc);
9147
9148 for (;;) {
9149 prepare_to_wait_exclusive(&asoc->wait, &wait,
9150 TASK_INTERRUPTIBLE);
9151 if (!*timeo_p)
9152 goto do_nonblock;
9153 if (sk->sk_shutdown & RCV_SHUTDOWN)
9154 break;
9155 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9156 asoc->base.dead)
9157 goto do_error;
9158 if (signal_pending(current))
9159 goto do_interrupted;
9160
9161 if (sctp_state(asoc, ESTABLISHED))
9162 break;
9163
9164 /* Let another process have a go. Since we are going
9165 * to sleep anyway.
9166 */
9167 release_sock(sk);
9168 current_timeo = schedule_timeout(current_timeo);
9169 lock_sock(sk);
9170
9171 *timeo_p = current_timeo;
9172 }
9173
9174out:
9175 finish_wait(&asoc->wait, &wait);
9176
9177 /* Release the association's refcnt. */
9178 sctp_association_put(asoc);
9179
9180 return err;
9181
9182do_error:
9183 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9184 err = -ETIMEDOUT;
9185 else
9186 err = -ECONNREFUSED;
9187 goto out;
9188
9189do_interrupted:
9190 err = sock_intr_errno(*timeo_p);
9191 goto out;
9192
9193do_nonblock:
9194 err = -EINPROGRESS;
9195 goto out;
9196}
9197
9198static int sctp_wait_for_accept(struct sock *sk, long timeo)
9199{
9200 struct sctp_endpoint *ep;
9201 int err = 0;
9202 DEFINE_WAIT(wait);
9203
9204 ep = sctp_sk(sk)->ep;
9205
9206
9207 for (;;) {
9208 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9209 TASK_INTERRUPTIBLE);
9210
9211 if (list_empty(&ep->asocs)) {
9212 release_sock(sk);
9213 timeo = schedule_timeout(timeo);
9214 lock_sock(sk);
9215 }
9216
9217 err = -EINVAL;
9218 if (!sctp_sstate(sk, LISTENING))
9219 break;
9220
9221 err = 0;
9222 if (!list_empty(&ep->asocs))
9223 break;
9224
9225 err = sock_intr_errno(timeo);
9226 if (signal_pending(current))
9227 break;
9228
9229 err = -EAGAIN;
9230 if (!timeo)
9231 break;
9232 }
9233
9234 finish_wait(sk_sleep(sk), &wait);
9235
9236 return err;
9237}
9238
9239static void sctp_wait_for_close(struct sock *sk, long timeout)
9240{
9241 DEFINE_WAIT(wait);
9242
9243 do {
9244 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9245 if (list_empty(&sctp_sk(sk)->ep->asocs))
9246 break;
9247 release_sock(sk);
9248 timeout = schedule_timeout(timeout);
9249 lock_sock(sk);
9250 } while (!signal_pending(current) && timeout);
9251
9252 finish_wait(sk_sleep(sk), &wait);
9253}
9254
9255static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9256{
9257 struct sk_buff *frag;
9258
9259 if (!skb->data_len)
9260 goto done;
9261
9262 /* Don't forget the fragments. */
9263 skb_walk_frags(skb, frag)
9264 sctp_skb_set_owner_r_frag(frag, sk);
9265
9266done:
9267 sctp_skb_set_owner_r(skb, sk);
9268}
9269
9270void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9271 struct sctp_association *asoc)
9272{
9273 struct inet_sock *inet = inet_sk(sk);
9274 struct inet_sock *newinet;
9275 struct sctp_sock *sp = sctp_sk(sk);
9276 struct sctp_endpoint *ep = sp->ep;
9277
9278 newsk->sk_type = sk->sk_type;
9279 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9280 newsk->sk_flags = sk->sk_flags;
9281 newsk->sk_tsflags = sk->sk_tsflags;
9282 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9283 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9284 newsk->sk_reuse = sk->sk_reuse;
9285 sctp_sk(newsk)->reuse = sp->reuse;
9286
9287 newsk->sk_shutdown = sk->sk_shutdown;
9288 newsk->sk_destruct = sctp_destruct_sock;
9289 newsk->sk_family = sk->sk_family;
9290 newsk->sk_protocol = IPPROTO_SCTP;
9291 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9292 newsk->sk_sndbuf = sk->sk_sndbuf;
9293 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9294 newsk->sk_lingertime = sk->sk_lingertime;
9295 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9296 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9297 newsk->sk_rxhash = sk->sk_rxhash;
9298
9299 newinet = inet_sk(newsk);
9300
9301 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9302 * getsockname() and getpeername()
9303 */
9304 newinet->inet_sport = inet->inet_sport;
9305 newinet->inet_saddr = inet->inet_saddr;
9306 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9307 newinet->inet_dport = htons(asoc->peer.port);
9308 newinet->pmtudisc = inet->pmtudisc;
9309 newinet->inet_id = prandom_u32();
9310
9311 newinet->uc_ttl = inet->uc_ttl;
9312 newinet->mc_loop = 1;
9313 newinet->mc_ttl = 1;
9314 newinet->mc_index = 0;
9315 newinet->mc_list = NULL;
9316
9317 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9318 net_enable_timestamp();
9319
9320 /* Set newsk security attributes from orginal sk and connection
9321 * security attribute from ep.
9322 */
9323 security_sctp_sk_clone(ep, sk, newsk);
9324}
9325
9326static inline void sctp_copy_descendant(struct sock *sk_to,
9327 const struct sock *sk_from)
9328{
9329 int ancestor_size = sizeof(struct inet_sock) +
9330 sizeof(struct sctp_sock) -
9331 offsetof(struct sctp_sock, pd_lobby);
9332
9333 if (sk_from->sk_family == PF_INET6)
9334 ancestor_size += sizeof(struct ipv6_pinfo);
9335
9336 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9337}
9338
9339/* Populate the fields of the newsk from the oldsk and migrate the assoc
9340 * and its messages to the newsk.
9341 */
9342static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9343 struct sctp_association *assoc,
9344 enum sctp_socket_type type)
9345{
9346 struct sctp_sock *oldsp = sctp_sk(oldsk);
9347 struct sctp_sock *newsp = sctp_sk(newsk);
9348 struct sctp_bind_bucket *pp; /* hash list port iterator */
9349 struct sctp_endpoint *newep = newsp->ep;
9350 struct sk_buff *skb, *tmp;
9351 struct sctp_ulpevent *event;
9352 struct sctp_bind_hashbucket *head;
9353 int err;
9354
9355 /* Migrate socket buffer sizes and all the socket level options to the
9356 * new socket.
9357 */
9358 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9359 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9360 /* Brute force copy old sctp opt. */
9361 sctp_copy_descendant(newsk, oldsk);
9362
9363 /* Restore the ep value that was overwritten with the above structure
9364 * copy.
9365 */
9366 newsp->ep = newep;
9367 newsp->hmac = NULL;
9368
9369 /* Hook this new socket in to the bind_hash list. */
9370 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9371 inet_sk(oldsk)->inet_num)];
9372 spin_lock_bh(&head->lock);
9373 pp = sctp_sk(oldsk)->bind_hash;
9374 sk_add_bind_node(newsk, &pp->owner);
9375 sctp_sk(newsk)->bind_hash = pp;
9376 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9377 spin_unlock_bh(&head->lock);
9378
9379 /* Copy the bind_addr list from the original endpoint to the new
9380 * endpoint so that we can handle restarts properly
9381 */
9382 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9383 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9384 if (err)
9385 return err;
9386
9387 /* New ep's auth_hmacs should be set if old ep's is set, in case
9388 * that net->sctp.auth_enable has been changed to 0 by users and
9389 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9390 */
9391 if (oldsp->ep->auth_hmacs) {
9392 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9393 if (err)
9394 return err;
9395 }
9396
9397 /* Move any messages in the old socket's receive queue that are for the
9398 * peeled off association to the new socket's receive queue.
9399 */
9400 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9401 event = sctp_skb2event(skb);
9402 if (event->asoc == assoc) {
9403 __skb_unlink(skb, &oldsk->sk_receive_queue);
9404 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9405 sctp_skb_set_owner_r_frag(skb, newsk);
9406 }
9407 }
9408
9409 /* Clean up any messages pending delivery due to partial
9410 * delivery. Three cases:
9411 * 1) No partial deliver; no work.
9412 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9413 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9414 */
9415 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9416
9417 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9418 struct sk_buff_head *queue;
9419
9420 /* Decide which queue to move pd_lobby skbs to. */
9421 if (assoc->ulpq.pd_mode) {
9422 queue = &newsp->pd_lobby;
9423 } else
9424 queue = &newsk->sk_receive_queue;
9425
9426 /* Walk through the pd_lobby, looking for skbs that
9427 * need moved to the new socket.
9428 */
9429 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9430 event = sctp_skb2event(skb);
9431 if (event->asoc == assoc) {
9432 __skb_unlink(skb, &oldsp->pd_lobby);
9433 __skb_queue_tail(queue, skb);
9434 sctp_skb_set_owner_r_frag(skb, newsk);
9435 }
9436 }
9437
9438 /* Clear up any skbs waiting for the partial
9439 * delivery to finish.
9440 */
9441 if (assoc->ulpq.pd_mode)
9442 sctp_clear_pd(oldsk, NULL);
9443
9444 }
9445
9446 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9447
9448 /* Set the type of socket to indicate that it is peeled off from the
9449 * original UDP-style socket or created with the accept() call on a
9450 * TCP-style socket..
9451 */
9452 newsp->type = type;
9453
9454 /* Mark the new socket "in-use" by the user so that any packets
9455 * that may arrive on the association after we've moved it are
9456 * queued to the backlog. This prevents a potential race between
9457 * backlog processing on the old socket and new-packet processing
9458 * on the new socket.
9459 *
9460 * The caller has just allocated newsk so we can guarantee that other
9461 * paths won't try to lock it and then oldsk.
9462 */
9463 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9464 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9465 sctp_assoc_migrate(assoc, newsk);
9466 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9467
9468 /* If the association on the newsk is already closed before accept()
9469 * is called, set RCV_SHUTDOWN flag.
9470 */
9471 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9472 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9473 newsk->sk_shutdown |= RCV_SHUTDOWN;
9474 } else {
9475 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9476 }
9477
9478 release_sock(newsk);
9479
9480 return 0;
9481}
9482
9483
9484/* This proto struct describes the ULP interface for SCTP. */
9485struct proto sctp_prot = {
9486 .name = "SCTP",
9487 .owner = THIS_MODULE,
9488 .close = sctp_close,
9489 .disconnect = sctp_disconnect,
9490 .accept = sctp_accept,
9491 .ioctl = sctp_ioctl,
9492 .init = sctp_init_sock,
9493 .destroy = sctp_destroy_sock,
9494 .shutdown = sctp_shutdown,
9495 .setsockopt = sctp_setsockopt,
9496 .getsockopt = sctp_getsockopt,
9497 .sendmsg = sctp_sendmsg,
9498 .recvmsg = sctp_recvmsg,
9499 .bind = sctp_bind,
9500 .backlog_rcv = sctp_backlog_rcv,
9501 .hash = sctp_hash,
9502 .unhash = sctp_unhash,
9503 .no_autobind = true,
9504 .obj_size = sizeof(struct sctp_sock),
9505 .useroffset = offsetof(struct sctp_sock, subscribe),
9506 .usersize = offsetof(struct sctp_sock, initmsg) -
9507 offsetof(struct sctp_sock, subscribe) +
9508 sizeof_field(struct sctp_sock, initmsg),
9509 .sysctl_mem = sysctl_sctp_mem,
9510 .sysctl_rmem = sysctl_sctp_rmem,
9511 .sysctl_wmem = sysctl_sctp_wmem,
9512 .memory_pressure = &sctp_memory_pressure,
9513 .enter_memory_pressure = sctp_enter_memory_pressure,
9514 .memory_allocated = &sctp_memory_allocated,
9515 .sockets_allocated = &sctp_sockets_allocated,
9516};
9517
9518#if IS_ENABLED(CONFIG_IPV6)
9519
9520#include <net/transp_v6.h>
9521static void sctp_v6_destroy_sock(struct sock *sk)
9522{
9523 sctp_destroy_sock(sk);
9524 inet6_destroy_sock(sk);
9525}
9526
9527struct proto sctpv6_prot = {
9528 .name = "SCTPv6",
9529 .owner = THIS_MODULE,
9530 .close = sctp_close,
9531 .disconnect = sctp_disconnect,
9532 .accept = sctp_accept,
9533 .ioctl = sctp_ioctl,
9534 .init = sctp_init_sock,
9535 .destroy = sctp_v6_destroy_sock,
9536 .shutdown = sctp_shutdown,
9537 .setsockopt = sctp_setsockopt,
9538 .getsockopt = sctp_getsockopt,
9539 .sendmsg = sctp_sendmsg,
9540 .recvmsg = sctp_recvmsg,
9541 .bind = sctp_bind,
9542 .backlog_rcv = sctp_backlog_rcv,
9543 .hash = sctp_hash,
9544 .unhash = sctp_unhash,
9545 .no_autobind = true,
9546 .obj_size = sizeof(struct sctp6_sock),
9547 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9548 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9549 offsetof(struct sctp6_sock, sctp.subscribe) +
9550 sizeof_field(struct sctp6_sock, sctp.initmsg),
9551 .sysctl_mem = sysctl_sctp_mem,
9552 .sysctl_rmem = sysctl_sctp_rmem,
9553 .sysctl_wmem = sysctl_sctp_wmem,
9554 .memory_pressure = &sctp_memory_pressure,
9555 .enter_memory_pressure = sctp_enter_memory_pressure,
9556 .memory_allocated = &sctp_memory_allocated,
9557 .sockets_allocated = &sctp_sockets_allocated,
9558};
9559#endif /* IS_ENABLED(CONFIG_IPV6) */