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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
150#define traverse_and_process() \
151do { \
152 msg = chunk->msg; \
153 if (msg == prev_msg) \
154 continue; \
155 list_for_each_entry(c, &msg->chunks, frag_list) { \
156 if ((clear && asoc->base.sk == c->skb->sk) || \
157 (!clear && asoc->base.sk != c->skb->sk)) \
158 cb(c); \
159 } \
160 prev_msg = msg; \
161} while (0)
162
163static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
164 bool clear,
165 void (*cb)(struct sctp_chunk *))
166
167{
168 struct sctp_datamsg *msg, *prev_msg = NULL;
169 struct sctp_outq *q = &asoc->outqueue;
170 struct sctp_chunk *chunk, *c;
171 struct sctp_transport *t;
172
173 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
175 traverse_and_process();
176
177 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
178 traverse_and_process();
179
180 list_for_each_entry(chunk, &q->sacked, transmitted_list)
181 traverse_and_process();
182
183 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
184 traverse_and_process();
185
186 list_for_each_entry(chunk, &q->out_chunk_list, list)
187 traverse_and_process();
188}
189
190static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
191 void (*cb)(struct sk_buff *, struct sock *))
192
193{
194 struct sk_buff *skb, *tmp;
195
196 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
197 cb(skb, sk);
198
199 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
200 cb(skb, sk);
201
202 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
203 cb(skb, sk);
204}
205
206/* Verify that this is a valid address. */
207static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
208 int len)
209{
210 struct sctp_af *af;
211
212 /* Verify basic sockaddr. */
213 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
214 if (!af)
215 return -EINVAL;
216
217 /* Is this a valid SCTP address? */
218 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
219 return -EINVAL;
220
221 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
222 return -EINVAL;
223
224 return 0;
225}
226
227/* Look up the association by its id. If this is not a UDP-style
228 * socket, the ID field is always ignored.
229 */
230struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
231{
232 struct sctp_association *asoc = NULL;
233
234 /* If this is not a UDP-style socket, assoc id should be ignored. */
235 if (!sctp_style(sk, UDP)) {
236 /* Return NULL if the socket state is not ESTABLISHED. It
237 * could be a TCP-style listening socket or a socket which
238 * hasn't yet called connect() to establish an association.
239 */
240 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
241 return NULL;
242
243 /* Get the first and the only association from the list. */
244 if (!list_empty(&sctp_sk(sk)->ep->asocs))
245 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
246 struct sctp_association, asocs);
247 return asoc;
248 }
249
250 /* Otherwise this is a UDP-style socket. */
251 if (id <= SCTP_ALL_ASSOC)
252 return NULL;
253
254 spin_lock_bh(&sctp_assocs_id_lock);
255 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
256 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
257 asoc = NULL;
258 spin_unlock_bh(&sctp_assocs_id_lock);
259
260 return asoc;
261}
262
263/* Look up the transport from an address and an assoc id. If both address and
264 * id are specified, the associations matching the address and the id should be
265 * the same.
266 */
267static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
268 struct sockaddr_storage *addr,
269 sctp_assoc_t id)
270{
271 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
272 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
273 union sctp_addr *laddr = (union sctp_addr *)addr;
274 struct sctp_transport *transport;
275
276 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
277 return NULL;
278
279 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
280 laddr,
281 &transport);
282
283 if (!addr_asoc)
284 return NULL;
285
286 id_asoc = sctp_id2assoc(sk, id);
287 if (id_asoc && (id_asoc != addr_asoc))
288 return NULL;
289
290 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
291 (union sctp_addr *)addr);
292
293 return transport;
294}
295
296/* API 3.1.2 bind() - UDP Style Syntax
297 * The syntax of bind() is,
298 *
299 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
300 *
301 * sd - the socket descriptor returned by socket().
302 * addr - the address structure (struct sockaddr_in or struct
303 * sockaddr_in6 [RFC 2553]),
304 * addr_len - the size of the address structure.
305 */
306static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
307{
308 int retval = 0;
309
310 lock_sock(sk);
311
312 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
313 addr, addr_len);
314
315 /* Disallow binding twice. */
316 if (!sctp_sk(sk)->ep->base.bind_addr.port)
317 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
318 addr_len);
319 else
320 retval = -EINVAL;
321
322 release_sock(sk);
323
324 return retval;
325}
326
327static int sctp_get_port_local(struct sock *, union sctp_addr *);
328
329/* Verify this is a valid sockaddr. */
330static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
331 union sctp_addr *addr, int len)
332{
333 struct sctp_af *af;
334
335 /* Check minimum size. */
336 if (len < sizeof (struct sockaddr))
337 return NULL;
338
339 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
340 return NULL;
341
342 if (addr->sa.sa_family == AF_INET6) {
343 if (len < SIN6_LEN_RFC2133)
344 return NULL;
345 /* V4 mapped address are really of AF_INET family */
346 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
347 !opt->pf->af_supported(AF_INET, opt))
348 return NULL;
349 }
350
351 /* If we get this far, af is valid. */
352 af = sctp_get_af_specific(addr->sa.sa_family);
353
354 if (len < af->sockaddr_len)
355 return NULL;
356
357 return af;
358}
359
360/* Bind a local address either to an endpoint or to an association. */
361static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
362{
363 struct net *net = sock_net(sk);
364 struct sctp_sock *sp = sctp_sk(sk);
365 struct sctp_endpoint *ep = sp->ep;
366 struct sctp_bind_addr *bp = &ep->base.bind_addr;
367 struct sctp_af *af;
368 unsigned short snum;
369 int ret = 0;
370
371 /* Common sockaddr verification. */
372 af = sctp_sockaddr_af(sp, addr, len);
373 if (!af) {
374 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
375 __func__, sk, addr, len);
376 return -EINVAL;
377 }
378
379 snum = ntohs(addr->v4.sin_port);
380
381 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
382 __func__, sk, &addr->sa, bp->port, snum, len);
383
384 /* PF specific bind() address verification. */
385 if (!sp->pf->bind_verify(sp, addr))
386 return -EADDRNOTAVAIL;
387
388 /* We must either be unbound, or bind to the same port.
389 * It's OK to allow 0 ports if we are already bound.
390 * We'll just inhert an already bound port in this case
391 */
392 if (bp->port) {
393 if (!snum)
394 snum = bp->port;
395 else if (snum != bp->port) {
396 pr_debug("%s: new port %d doesn't match existing port "
397 "%d\n", __func__, snum, bp->port);
398 return -EINVAL;
399 }
400 }
401
402 if (snum && inet_port_requires_bind_service(net, snum) &&
403 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
404 return -EACCES;
405
406 /* See if the address matches any of the addresses we may have
407 * already bound before checking against other endpoints.
408 */
409 if (sctp_bind_addr_match(bp, addr, sp))
410 return -EINVAL;
411
412 /* Make sure we are allowed to bind here.
413 * The function sctp_get_port_local() does duplicate address
414 * detection.
415 */
416 addr->v4.sin_port = htons(snum);
417 if (sctp_get_port_local(sk, addr))
418 return -EADDRINUSE;
419
420 /* Refresh ephemeral port. */
421 if (!bp->port)
422 bp->port = inet_sk(sk)->inet_num;
423
424 /* Add the address to the bind address list.
425 * Use GFP_ATOMIC since BHs will be disabled.
426 */
427 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
428 SCTP_ADDR_SRC, GFP_ATOMIC);
429
430 if (ret) {
431 sctp_put_port(sk);
432 return ret;
433 }
434 /* Copy back into socket for getsockname() use. */
435 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
436 sp->pf->to_sk_saddr(addr, sk);
437
438 return ret;
439}
440
441 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
442 *
443 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
444 * at any one time. If a sender, after sending an ASCONF chunk, decides
445 * it needs to transfer another ASCONF Chunk, it MUST wait until the
446 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
447 * subsequent ASCONF. Note this restriction binds each side, so at any
448 * time two ASCONF may be in-transit on any given association (one sent
449 * from each endpoint).
450 */
451static int sctp_send_asconf(struct sctp_association *asoc,
452 struct sctp_chunk *chunk)
453{
454 int retval = 0;
455
456 /* If there is an outstanding ASCONF chunk, queue it for later
457 * transmission.
458 */
459 if (asoc->addip_last_asconf) {
460 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
461 goto out;
462 }
463
464 /* Hold the chunk until an ASCONF_ACK is received. */
465 sctp_chunk_hold(chunk);
466 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
467 if (retval)
468 sctp_chunk_free(chunk);
469 else
470 asoc->addip_last_asconf = chunk;
471
472out:
473 return retval;
474}
475
476/* Add a list of addresses as bind addresses to local endpoint or
477 * association.
478 *
479 * Basically run through each address specified in the addrs/addrcnt
480 * array/length pair, determine if it is IPv6 or IPv4 and call
481 * sctp_do_bind() on it.
482 *
483 * If any of them fails, then the operation will be reversed and the
484 * ones that were added will be removed.
485 *
486 * Only sctp_setsockopt_bindx() is supposed to call this function.
487 */
488static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
489{
490 int cnt;
491 int retval = 0;
492 void *addr_buf;
493 struct sockaddr *sa_addr;
494 struct sctp_af *af;
495
496 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
497 addrs, addrcnt);
498
499 addr_buf = addrs;
500 for (cnt = 0; cnt < addrcnt; cnt++) {
501 /* The list may contain either IPv4 or IPv6 address;
502 * determine the address length for walking thru the list.
503 */
504 sa_addr = addr_buf;
505 af = sctp_get_af_specific(sa_addr->sa_family);
506 if (!af) {
507 retval = -EINVAL;
508 goto err_bindx_add;
509 }
510
511 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
512 af->sockaddr_len);
513
514 addr_buf += af->sockaddr_len;
515
516err_bindx_add:
517 if (retval < 0) {
518 /* Failed. Cleanup the ones that have been added */
519 if (cnt > 0)
520 sctp_bindx_rem(sk, addrs, cnt);
521 return retval;
522 }
523 }
524
525 return retval;
526}
527
528/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
529 * associations that are part of the endpoint indicating that a list of local
530 * addresses are added to the endpoint.
531 *
532 * If any of the addresses is already in the bind address list of the
533 * association, we do not send the chunk for that association. But it will not
534 * affect other associations.
535 *
536 * Only sctp_setsockopt_bindx() is supposed to call this function.
537 */
538static int sctp_send_asconf_add_ip(struct sock *sk,
539 struct sockaddr *addrs,
540 int addrcnt)
541{
542 struct sctp_sock *sp;
543 struct sctp_endpoint *ep;
544 struct sctp_association *asoc;
545 struct sctp_bind_addr *bp;
546 struct sctp_chunk *chunk;
547 struct sctp_sockaddr_entry *laddr;
548 union sctp_addr *addr;
549 union sctp_addr saveaddr;
550 void *addr_buf;
551 struct sctp_af *af;
552 struct list_head *p;
553 int i;
554 int retval = 0;
555
556 sp = sctp_sk(sk);
557 ep = sp->ep;
558
559 if (!ep->asconf_enable)
560 return retval;
561
562 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
563 __func__, sk, addrs, addrcnt);
564
565 list_for_each_entry(asoc, &ep->asocs, asocs) {
566 if (!asoc->peer.asconf_capable)
567 continue;
568
569 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
570 continue;
571
572 if (!sctp_state(asoc, ESTABLISHED))
573 continue;
574
575 /* Check if any address in the packed array of addresses is
576 * in the bind address list of the association. If so,
577 * do not send the asconf chunk to its peer, but continue with
578 * other associations.
579 */
580 addr_buf = addrs;
581 for (i = 0; i < addrcnt; i++) {
582 addr = addr_buf;
583 af = sctp_get_af_specific(addr->v4.sin_family);
584 if (!af) {
585 retval = -EINVAL;
586 goto out;
587 }
588
589 if (sctp_assoc_lookup_laddr(asoc, addr))
590 break;
591
592 addr_buf += af->sockaddr_len;
593 }
594 if (i < addrcnt)
595 continue;
596
597 /* Use the first valid address in bind addr list of
598 * association as Address Parameter of ASCONF CHUNK.
599 */
600 bp = &asoc->base.bind_addr;
601 p = bp->address_list.next;
602 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
603 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
604 addrcnt, SCTP_PARAM_ADD_IP);
605 if (!chunk) {
606 retval = -ENOMEM;
607 goto out;
608 }
609
610 /* Add the new addresses to the bind address list with
611 * use_as_src set to 0.
612 */
613 addr_buf = addrs;
614 for (i = 0; i < addrcnt; i++) {
615 addr = addr_buf;
616 af = sctp_get_af_specific(addr->v4.sin_family);
617 memcpy(&saveaddr, addr, af->sockaddr_len);
618 retval = sctp_add_bind_addr(bp, &saveaddr,
619 sizeof(saveaddr),
620 SCTP_ADDR_NEW, GFP_ATOMIC);
621 addr_buf += af->sockaddr_len;
622 }
623 if (asoc->src_out_of_asoc_ok) {
624 struct sctp_transport *trans;
625
626 list_for_each_entry(trans,
627 &asoc->peer.transport_addr_list, transports) {
628 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
629 2*asoc->pathmtu, 4380));
630 trans->ssthresh = asoc->peer.i.a_rwnd;
631 trans->rto = asoc->rto_initial;
632 sctp_max_rto(asoc, trans);
633 trans->rtt = trans->srtt = trans->rttvar = 0;
634 /* Clear the source and route cache */
635 sctp_transport_route(trans, NULL,
636 sctp_sk(asoc->base.sk));
637 }
638 }
639 retval = sctp_send_asconf(asoc, chunk);
640 }
641
642out:
643 return retval;
644}
645
646/* Remove a list of addresses from bind addresses list. Do not remove the
647 * last address.
648 *
649 * Basically run through each address specified in the addrs/addrcnt
650 * array/length pair, determine if it is IPv6 or IPv4 and call
651 * sctp_del_bind() on it.
652 *
653 * If any of them fails, then the operation will be reversed and the
654 * ones that were removed will be added back.
655 *
656 * At least one address has to be left; if only one address is
657 * available, the operation will return -EBUSY.
658 *
659 * Only sctp_setsockopt_bindx() is supposed to call this function.
660 */
661static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
662{
663 struct sctp_sock *sp = sctp_sk(sk);
664 struct sctp_endpoint *ep = sp->ep;
665 int cnt;
666 struct sctp_bind_addr *bp = &ep->base.bind_addr;
667 int retval = 0;
668 void *addr_buf;
669 union sctp_addr *sa_addr;
670 struct sctp_af *af;
671
672 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
673 __func__, sk, addrs, addrcnt);
674
675 addr_buf = addrs;
676 for (cnt = 0; cnt < addrcnt; cnt++) {
677 /* If the bind address list is empty or if there is only one
678 * bind address, there is nothing more to be removed (we need
679 * at least one address here).
680 */
681 if (list_empty(&bp->address_list) ||
682 (sctp_list_single_entry(&bp->address_list))) {
683 retval = -EBUSY;
684 goto err_bindx_rem;
685 }
686
687 sa_addr = addr_buf;
688 af = sctp_get_af_specific(sa_addr->sa.sa_family);
689 if (!af) {
690 retval = -EINVAL;
691 goto err_bindx_rem;
692 }
693
694 if (!af->addr_valid(sa_addr, sp, NULL)) {
695 retval = -EADDRNOTAVAIL;
696 goto err_bindx_rem;
697 }
698
699 if (sa_addr->v4.sin_port &&
700 sa_addr->v4.sin_port != htons(bp->port)) {
701 retval = -EINVAL;
702 goto err_bindx_rem;
703 }
704
705 if (!sa_addr->v4.sin_port)
706 sa_addr->v4.sin_port = htons(bp->port);
707
708 /* FIXME - There is probably a need to check if sk->sk_saddr and
709 * sk->sk_rcv_addr are currently set to one of the addresses to
710 * be removed. This is something which needs to be looked into
711 * when we are fixing the outstanding issues with multi-homing
712 * socket routing and failover schemes. Refer to comments in
713 * sctp_do_bind(). -daisy
714 */
715 retval = sctp_del_bind_addr(bp, sa_addr);
716
717 addr_buf += af->sockaddr_len;
718err_bindx_rem:
719 if (retval < 0) {
720 /* Failed. Add the ones that has been removed back */
721 if (cnt > 0)
722 sctp_bindx_add(sk, addrs, cnt);
723 return retval;
724 }
725 }
726
727 return retval;
728}
729
730/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
731 * the associations that are part of the endpoint indicating that a list of
732 * local addresses are removed from the endpoint.
733 *
734 * If any of the addresses is already in the bind address list of the
735 * association, we do not send the chunk for that association. But it will not
736 * affect other associations.
737 *
738 * Only sctp_setsockopt_bindx() is supposed to call this function.
739 */
740static int sctp_send_asconf_del_ip(struct sock *sk,
741 struct sockaddr *addrs,
742 int addrcnt)
743{
744 struct sctp_sock *sp;
745 struct sctp_endpoint *ep;
746 struct sctp_association *asoc;
747 struct sctp_transport *transport;
748 struct sctp_bind_addr *bp;
749 struct sctp_chunk *chunk;
750 union sctp_addr *laddr;
751 void *addr_buf;
752 struct sctp_af *af;
753 struct sctp_sockaddr_entry *saddr;
754 int i;
755 int retval = 0;
756 int stored = 0;
757
758 chunk = NULL;
759 sp = sctp_sk(sk);
760 ep = sp->ep;
761
762 if (!ep->asconf_enable)
763 return retval;
764
765 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
766 __func__, sk, addrs, addrcnt);
767
768 list_for_each_entry(asoc, &ep->asocs, asocs) {
769
770 if (!asoc->peer.asconf_capable)
771 continue;
772
773 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
774 continue;
775
776 if (!sctp_state(asoc, ESTABLISHED))
777 continue;
778
779 /* Check if any address in the packed array of addresses is
780 * not present in the bind address list of the association.
781 * If so, do not send the asconf chunk to its peer, but
782 * continue with other associations.
783 */
784 addr_buf = addrs;
785 for (i = 0; i < addrcnt; i++) {
786 laddr = addr_buf;
787 af = sctp_get_af_specific(laddr->v4.sin_family);
788 if (!af) {
789 retval = -EINVAL;
790 goto out;
791 }
792
793 if (!sctp_assoc_lookup_laddr(asoc, laddr))
794 break;
795
796 addr_buf += af->sockaddr_len;
797 }
798 if (i < addrcnt)
799 continue;
800
801 /* Find one address in the association's bind address list
802 * that is not in the packed array of addresses. This is to
803 * make sure that we do not delete all the addresses in the
804 * association.
805 */
806 bp = &asoc->base.bind_addr;
807 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
808 addrcnt, sp);
809 if ((laddr == NULL) && (addrcnt == 1)) {
810 if (asoc->asconf_addr_del_pending)
811 continue;
812 asoc->asconf_addr_del_pending =
813 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
814 if (asoc->asconf_addr_del_pending == NULL) {
815 retval = -ENOMEM;
816 goto out;
817 }
818 asoc->asconf_addr_del_pending->sa.sa_family =
819 addrs->sa_family;
820 asoc->asconf_addr_del_pending->v4.sin_port =
821 htons(bp->port);
822 if (addrs->sa_family == AF_INET) {
823 struct sockaddr_in *sin;
824
825 sin = (struct sockaddr_in *)addrs;
826 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
827 } else if (addrs->sa_family == AF_INET6) {
828 struct sockaddr_in6 *sin6;
829
830 sin6 = (struct sockaddr_in6 *)addrs;
831 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
832 }
833
834 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
835 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
836 asoc->asconf_addr_del_pending);
837
838 asoc->src_out_of_asoc_ok = 1;
839 stored = 1;
840 goto skip_mkasconf;
841 }
842
843 if (laddr == NULL)
844 return -EINVAL;
845
846 /* We do not need RCU protection throughout this loop
847 * because this is done under a socket lock from the
848 * setsockopt call.
849 */
850 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
851 SCTP_PARAM_DEL_IP);
852 if (!chunk) {
853 retval = -ENOMEM;
854 goto out;
855 }
856
857skip_mkasconf:
858 /* Reset use_as_src flag for the addresses in the bind address
859 * list that are to be deleted.
860 */
861 addr_buf = addrs;
862 for (i = 0; i < addrcnt; i++) {
863 laddr = addr_buf;
864 af = sctp_get_af_specific(laddr->v4.sin_family);
865 list_for_each_entry(saddr, &bp->address_list, list) {
866 if (sctp_cmp_addr_exact(&saddr->a, laddr))
867 saddr->state = SCTP_ADDR_DEL;
868 }
869 addr_buf += af->sockaddr_len;
870 }
871
872 /* Update the route and saddr entries for all the transports
873 * as some of the addresses in the bind address list are
874 * about to be deleted and cannot be used as source addresses.
875 */
876 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
877 transports) {
878 sctp_transport_route(transport, NULL,
879 sctp_sk(asoc->base.sk));
880 }
881
882 if (stored)
883 /* We don't need to transmit ASCONF */
884 continue;
885 retval = sctp_send_asconf(asoc, chunk);
886 }
887out:
888 return retval;
889}
890
891/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
892int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
893{
894 struct sock *sk = sctp_opt2sk(sp);
895 union sctp_addr *addr;
896 struct sctp_af *af;
897
898 /* It is safe to write port space in caller. */
899 addr = &addrw->a;
900 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
901 af = sctp_get_af_specific(addr->sa.sa_family);
902 if (!af)
903 return -EINVAL;
904 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
905 return -EINVAL;
906
907 if (addrw->state == SCTP_ADDR_NEW)
908 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
909 else
910 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
911}
912
913/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
914 *
915 * API 8.1
916 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
917 * int flags);
918 *
919 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
920 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
921 * or IPv6 addresses.
922 *
923 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
924 * Section 3.1.2 for this usage.
925 *
926 * addrs is a pointer to an array of one or more socket addresses. Each
927 * address is contained in its appropriate structure (i.e. struct
928 * sockaddr_in or struct sockaddr_in6) the family of the address type
929 * must be used to distinguish the address length (note that this
930 * representation is termed a "packed array" of addresses). The caller
931 * specifies the number of addresses in the array with addrcnt.
932 *
933 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
934 * -1, and sets errno to the appropriate error code.
935 *
936 * For SCTP, the port given in each socket address must be the same, or
937 * sctp_bindx() will fail, setting errno to EINVAL.
938 *
939 * The flags parameter is formed from the bitwise OR of zero or more of
940 * the following currently defined flags:
941 *
942 * SCTP_BINDX_ADD_ADDR
943 *
944 * SCTP_BINDX_REM_ADDR
945 *
946 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
947 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
948 * addresses from the association. The two flags are mutually exclusive;
949 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
950 * not remove all addresses from an association; sctp_bindx() will
951 * reject such an attempt with EINVAL.
952 *
953 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
954 * additional addresses with an endpoint after calling bind(). Or use
955 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
956 * socket is associated with so that no new association accepted will be
957 * associated with those addresses. If the endpoint supports dynamic
958 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
959 * endpoint to send the appropriate message to the peer to change the
960 * peers address lists.
961 *
962 * Adding and removing addresses from a connected association is
963 * optional functionality. Implementations that do not support this
964 * functionality should return EOPNOTSUPP.
965 *
966 * Basically do nothing but copying the addresses from user to kernel
967 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
968 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
969 * from userspace.
970 *
971 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
972 * it.
973 *
974 * sk The sk of the socket
975 * addrs The pointer to the addresses
976 * addrssize Size of the addrs buffer
977 * op Operation to perform (add or remove, see the flags of
978 * sctp_bindx)
979 *
980 * Returns 0 if ok, <0 errno code on error.
981 */
982static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
983 int addrs_size, int op)
984{
985 int err;
986 int addrcnt = 0;
987 int walk_size = 0;
988 struct sockaddr *sa_addr;
989 void *addr_buf = addrs;
990 struct sctp_af *af;
991
992 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
993 __func__, sk, addr_buf, addrs_size, op);
994
995 if (unlikely(addrs_size <= 0))
996 return -EINVAL;
997
998 /* Walk through the addrs buffer and count the number of addresses. */
999 while (walk_size < addrs_size) {
1000 if (walk_size + sizeof(sa_family_t) > addrs_size)
1001 return -EINVAL;
1002
1003 sa_addr = addr_buf;
1004 af = sctp_get_af_specific(sa_addr->sa_family);
1005
1006 /* If the address family is not supported or if this address
1007 * causes the address buffer to overflow return EINVAL.
1008 */
1009 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1010 return -EINVAL;
1011 addrcnt++;
1012 addr_buf += af->sockaddr_len;
1013 walk_size += af->sockaddr_len;
1014 }
1015
1016 /* Do the work. */
1017 switch (op) {
1018 case SCTP_BINDX_ADD_ADDR:
1019 /* Allow security module to validate bindx addresses. */
1020 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1021 addrs, addrs_size);
1022 if (err)
1023 return err;
1024 err = sctp_bindx_add(sk, addrs, addrcnt);
1025 if (err)
1026 return err;
1027 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1028 case SCTP_BINDX_REM_ADDR:
1029 err = sctp_bindx_rem(sk, addrs, addrcnt);
1030 if (err)
1031 return err;
1032 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1033
1034 default:
1035 return -EINVAL;
1036 }
1037}
1038
1039static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1040 int addrlen)
1041{
1042 int err;
1043
1044 lock_sock(sk);
1045 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1046 release_sock(sk);
1047 return err;
1048}
1049
1050static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1051 const union sctp_addr *daddr,
1052 const struct sctp_initmsg *init,
1053 struct sctp_transport **tp)
1054{
1055 struct sctp_association *asoc;
1056 struct sock *sk = ep->base.sk;
1057 struct net *net = sock_net(sk);
1058 enum sctp_scope scope;
1059 int err;
1060
1061 if (sctp_endpoint_is_peeled_off(ep, daddr))
1062 return -EADDRNOTAVAIL;
1063
1064 if (!ep->base.bind_addr.port) {
1065 if (sctp_autobind(sk))
1066 return -EAGAIN;
1067 } else {
1068 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1069 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1070 return -EACCES;
1071 }
1072
1073 scope = sctp_scope(daddr);
1074 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1075 if (!asoc)
1076 return -ENOMEM;
1077
1078 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1079 if (err < 0)
1080 goto free;
1081
1082 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1083 if (!*tp) {
1084 err = -ENOMEM;
1085 goto free;
1086 }
1087
1088 if (!init)
1089 return 0;
1090
1091 if (init->sinit_num_ostreams) {
1092 __u16 outcnt = init->sinit_num_ostreams;
1093
1094 asoc->c.sinit_num_ostreams = outcnt;
1095 /* outcnt has been changed, need to re-init stream */
1096 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1097 if (err)
1098 goto free;
1099 }
1100
1101 if (init->sinit_max_instreams)
1102 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1103
1104 if (init->sinit_max_attempts)
1105 asoc->max_init_attempts = init->sinit_max_attempts;
1106
1107 if (init->sinit_max_init_timeo)
1108 asoc->max_init_timeo =
1109 msecs_to_jiffies(init->sinit_max_init_timeo);
1110
1111 return 0;
1112free:
1113 sctp_association_free(asoc);
1114 return err;
1115}
1116
1117static int sctp_connect_add_peer(struct sctp_association *asoc,
1118 union sctp_addr *daddr, int addr_len)
1119{
1120 struct sctp_endpoint *ep = asoc->ep;
1121 struct sctp_association *old;
1122 struct sctp_transport *t;
1123 int err;
1124
1125 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1126 if (err)
1127 return err;
1128
1129 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1130 if (old && old != asoc)
1131 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1132 : -EALREADY;
1133
1134 if (sctp_endpoint_is_peeled_off(ep, daddr))
1135 return -EADDRNOTAVAIL;
1136
1137 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1138 if (!t)
1139 return -ENOMEM;
1140
1141 return 0;
1142}
1143
1144/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1145 *
1146 * Common routine for handling connect() and sctp_connectx().
1147 * Connect will come in with just a single address.
1148 */
1149static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1150 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1151{
1152 struct sctp_sock *sp = sctp_sk(sk);
1153 struct sctp_endpoint *ep = sp->ep;
1154 struct sctp_transport *transport;
1155 struct sctp_association *asoc;
1156 void *addr_buf = kaddrs;
1157 union sctp_addr *daddr;
1158 struct sctp_af *af;
1159 int walk_size, err;
1160 long timeo;
1161
1162 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1163 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1164 return -EISCONN;
1165
1166 daddr = addr_buf;
1167 af = sctp_get_af_specific(daddr->sa.sa_family);
1168 if (!af || af->sockaddr_len > addrs_size)
1169 return -EINVAL;
1170
1171 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1172 if (err)
1173 return err;
1174
1175 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1176 if (asoc)
1177 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1178 : -EALREADY;
1179
1180 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1181 if (err)
1182 return err;
1183 asoc = transport->asoc;
1184
1185 addr_buf += af->sockaddr_len;
1186 walk_size = af->sockaddr_len;
1187 while (walk_size < addrs_size) {
1188 err = -EINVAL;
1189 if (walk_size + sizeof(sa_family_t) > addrs_size)
1190 goto out_free;
1191
1192 daddr = addr_buf;
1193 af = sctp_get_af_specific(daddr->sa.sa_family);
1194 if (!af || af->sockaddr_len + walk_size > addrs_size)
1195 goto out_free;
1196
1197 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1198 goto out_free;
1199
1200 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1201 if (err)
1202 goto out_free;
1203
1204 addr_buf += af->sockaddr_len;
1205 walk_size += af->sockaddr_len;
1206 }
1207
1208 /* In case the user of sctp_connectx() wants an association
1209 * id back, assign one now.
1210 */
1211 if (assoc_id) {
1212 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1213 if (err < 0)
1214 goto out_free;
1215 }
1216
1217 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1218 if (err < 0)
1219 goto out_free;
1220
1221 /* Initialize sk's dport and daddr for getpeername() */
1222 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1223 sp->pf->to_sk_daddr(daddr, sk);
1224 sk->sk_err = 0;
1225
1226 if (assoc_id)
1227 *assoc_id = asoc->assoc_id;
1228
1229 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1230 return sctp_wait_for_connect(asoc, &timeo);
1231
1232out_free:
1233 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1234 __func__, asoc, kaddrs, err);
1235 sctp_association_free(asoc);
1236 return err;
1237}
1238
1239/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1240 *
1241 * API 8.9
1242 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1243 * sctp_assoc_t *asoc);
1244 *
1245 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1246 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1247 * or IPv6 addresses.
1248 *
1249 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1250 * Section 3.1.2 for this usage.
1251 *
1252 * addrs is a pointer to an array of one or more socket addresses. Each
1253 * address is contained in its appropriate structure (i.e. struct
1254 * sockaddr_in or struct sockaddr_in6) the family of the address type
1255 * must be used to distengish the address length (note that this
1256 * representation is termed a "packed array" of addresses). The caller
1257 * specifies the number of addresses in the array with addrcnt.
1258 *
1259 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1260 * the association id of the new association. On failure, sctp_connectx()
1261 * returns -1, and sets errno to the appropriate error code. The assoc_id
1262 * is not touched by the kernel.
1263 *
1264 * For SCTP, the port given in each socket address must be the same, or
1265 * sctp_connectx() will fail, setting errno to EINVAL.
1266 *
1267 * An application can use sctp_connectx to initiate an association with
1268 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1269 * allows a caller to specify multiple addresses at which a peer can be
1270 * reached. The way the SCTP stack uses the list of addresses to set up
1271 * the association is implementation dependent. This function only
1272 * specifies that the stack will try to make use of all the addresses in
1273 * the list when needed.
1274 *
1275 * Note that the list of addresses passed in is only used for setting up
1276 * the association. It does not necessarily equal the set of addresses
1277 * the peer uses for the resulting association. If the caller wants to
1278 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1279 * retrieve them after the association has been set up.
1280 *
1281 * Basically do nothing but copying the addresses from user to kernel
1282 * land and invoking either sctp_connectx(). This is used for tunneling
1283 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1284 *
1285 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1286 * it.
1287 *
1288 * sk The sk of the socket
1289 * addrs The pointer to the addresses
1290 * addrssize Size of the addrs buffer
1291 *
1292 * Returns >=0 if ok, <0 errno code on error.
1293 */
1294static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1295 int addrs_size, sctp_assoc_t *assoc_id)
1296{
1297 int err = 0, flags = 0;
1298
1299 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1300 __func__, sk, kaddrs, addrs_size);
1301
1302 /* make sure the 1st addr's sa_family is accessible later */
1303 if (unlikely(addrs_size < sizeof(sa_family_t)))
1304 return -EINVAL;
1305
1306 /* Allow security module to validate connectx addresses. */
1307 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1308 (struct sockaddr *)kaddrs,
1309 addrs_size);
1310 if (err)
1311 return err;
1312
1313 /* in-kernel sockets don't generally have a file allocated to them
1314 * if all they do is call sock_create_kern().
1315 */
1316 if (sk->sk_socket->file)
1317 flags = sk->sk_socket->file->f_flags;
1318
1319 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1320}
1321
1322/*
1323 * This is an older interface. It's kept for backward compatibility
1324 * to the option that doesn't provide association id.
1325 */
1326static int sctp_setsockopt_connectx_old(struct sock *sk,
1327 struct sockaddr *kaddrs,
1328 int addrs_size)
1329{
1330 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1331}
1332
1333/*
1334 * New interface for the API. The since the API is done with a socket
1335 * option, to make it simple we feed back the association id is as a return
1336 * indication to the call. Error is always negative and association id is
1337 * always positive.
1338 */
1339static int sctp_setsockopt_connectx(struct sock *sk,
1340 struct sockaddr *kaddrs,
1341 int addrs_size)
1342{
1343 sctp_assoc_t assoc_id = 0;
1344 int err = 0;
1345
1346 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1347
1348 if (err)
1349 return err;
1350 else
1351 return assoc_id;
1352}
1353
1354/*
1355 * New (hopefully final) interface for the API.
1356 * We use the sctp_getaddrs_old structure so that use-space library
1357 * can avoid any unnecessary allocations. The only different part
1358 * is that we store the actual length of the address buffer into the
1359 * addrs_num structure member. That way we can re-use the existing
1360 * code.
1361 */
1362#ifdef CONFIG_COMPAT
1363struct compat_sctp_getaddrs_old {
1364 sctp_assoc_t assoc_id;
1365 s32 addr_num;
1366 compat_uptr_t addrs; /* struct sockaddr * */
1367};
1368#endif
1369
1370static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1371 char __user *optval,
1372 int __user *optlen)
1373{
1374 struct sctp_getaddrs_old param;
1375 sctp_assoc_t assoc_id = 0;
1376 struct sockaddr *kaddrs;
1377 int err = 0;
1378
1379#ifdef CONFIG_COMPAT
1380 if (in_compat_syscall()) {
1381 struct compat_sctp_getaddrs_old param32;
1382
1383 if (len < sizeof(param32))
1384 return -EINVAL;
1385 if (copy_from_user(¶m32, optval, sizeof(param32)))
1386 return -EFAULT;
1387
1388 param.assoc_id = param32.assoc_id;
1389 param.addr_num = param32.addr_num;
1390 param.addrs = compat_ptr(param32.addrs);
1391 } else
1392#endif
1393 {
1394 if (len < sizeof(param))
1395 return -EINVAL;
1396 if (copy_from_user(¶m, optval, sizeof(param)))
1397 return -EFAULT;
1398 }
1399
1400 kaddrs = memdup_user(param.addrs, param.addr_num);
1401 if (IS_ERR(kaddrs))
1402 return PTR_ERR(kaddrs);
1403
1404 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1405 kfree(kaddrs);
1406 if (err == 0 || err == -EINPROGRESS) {
1407 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1408 return -EFAULT;
1409 if (put_user(sizeof(assoc_id), optlen))
1410 return -EFAULT;
1411 }
1412
1413 return err;
1414}
1415
1416/* API 3.1.4 close() - UDP Style Syntax
1417 * Applications use close() to perform graceful shutdown (as described in
1418 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1419 * by a UDP-style socket.
1420 *
1421 * The syntax is
1422 *
1423 * ret = close(int sd);
1424 *
1425 * sd - the socket descriptor of the associations to be closed.
1426 *
1427 * To gracefully shutdown a specific association represented by the
1428 * UDP-style socket, an application should use the sendmsg() call,
1429 * passing no user data, but including the appropriate flag in the
1430 * ancillary data (see Section xxxx).
1431 *
1432 * If sd in the close() call is a branched-off socket representing only
1433 * one association, the shutdown is performed on that association only.
1434 *
1435 * 4.1.6 close() - TCP Style Syntax
1436 *
1437 * Applications use close() to gracefully close down an association.
1438 *
1439 * The syntax is:
1440 *
1441 * int close(int sd);
1442 *
1443 * sd - the socket descriptor of the association to be closed.
1444 *
1445 * After an application calls close() on a socket descriptor, no further
1446 * socket operations will succeed on that descriptor.
1447 *
1448 * API 7.1.4 SO_LINGER
1449 *
1450 * An application using the TCP-style socket can use this option to
1451 * perform the SCTP ABORT primitive. The linger option structure is:
1452 *
1453 * struct linger {
1454 * int l_onoff; // option on/off
1455 * int l_linger; // linger time
1456 * };
1457 *
1458 * To enable the option, set l_onoff to 1. If the l_linger value is set
1459 * to 0, calling close() is the same as the ABORT primitive. If the
1460 * value is set to a negative value, the setsockopt() call will return
1461 * an error. If the value is set to a positive value linger_time, the
1462 * close() can be blocked for at most linger_time ms. If the graceful
1463 * shutdown phase does not finish during this period, close() will
1464 * return but the graceful shutdown phase continues in the system.
1465 */
1466static void sctp_close(struct sock *sk, long timeout)
1467{
1468 struct net *net = sock_net(sk);
1469 struct sctp_endpoint *ep;
1470 struct sctp_association *asoc;
1471 struct list_head *pos, *temp;
1472 unsigned int data_was_unread;
1473
1474 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1475
1476 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1477 sk->sk_shutdown = SHUTDOWN_MASK;
1478 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1479
1480 ep = sctp_sk(sk)->ep;
1481
1482 /* Clean up any skbs sitting on the receive queue. */
1483 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1484 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1485
1486 /* Walk all associations on an endpoint. */
1487 list_for_each_safe(pos, temp, &ep->asocs) {
1488 asoc = list_entry(pos, struct sctp_association, asocs);
1489
1490 if (sctp_style(sk, TCP)) {
1491 /* A closed association can still be in the list if
1492 * it belongs to a TCP-style listening socket that is
1493 * not yet accepted. If so, free it. If not, send an
1494 * ABORT or SHUTDOWN based on the linger options.
1495 */
1496 if (sctp_state(asoc, CLOSED)) {
1497 sctp_association_free(asoc);
1498 continue;
1499 }
1500 }
1501
1502 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1503 !skb_queue_empty(&asoc->ulpq.reasm) ||
1504 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1505 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1506 struct sctp_chunk *chunk;
1507
1508 chunk = sctp_make_abort_user(asoc, NULL, 0);
1509 sctp_primitive_ABORT(net, asoc, chunk);
1510 } else
1511 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1512 }
1513
1514 /* On a TCP-style socket, block for at most linger_time if set. */
1515 if (sctp_style(sk, TCP) && timeout)
1516 sctp_wait_for_close(sk, timeout);
1517
1518 /* This will run the backlog queue. */
1519 release_sock(sk);
1520
1521 /* Supposedly, no process has access to the socket, but
1522 * the net layers still may.
1523 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1524 * held and that should be grabbed before socket lock.
1525 */
1526 spin_lock_bh(&net->sctp.addr_wq_lock);
1527 bh_lock_sock_nested(sk);
1528
1529 /* Hold the sock, since sk_common_release() will put sock_put()
1530 * and we have just a little more cleanup.
1531 */
1532 sock_hold(sk);
1533 sk_common_release(sk);
1534
1535 bh_unlock_sock(sk);
1536 spin_unlock_bh(&net->sctp.addr_wq_lock);
1537
1538 sock_put(sk);
1539
1540 SCTP_DBG_OBJCNT_DEC(sock);
1541}
1542
1543/* Handle EPIPE error. */
1544static int sctp_error(struct sock *sk, int flags, int err)
1545{
1546 if (err == -EPIPE)
1547 err = sock_error(sk) ? : -EPIPE;
1548 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1549 send_sig(SIGPIPE, current, 0);
1550 return err;
1551}
1552
1553/* API 3.1.3 sendmsg() - UDP Style Syntax
1554 *
1555 * An application uses sendmsg() and recvmsg() calls to transmit data to
1556 * and receive data from its peer.
1557 *
1558 * ssize_t sendmsg(int socket, const struct msghdr *message,
1559 * int flags);
1560 *
1561 * socket - the socket descriptor of the endpoint.
1562 * message - pointer to the msghdr structure which contains a single
1563 * user message and possibly some ancillary data.
1564 *
1565 * See Section 5 for complete description of the data
1566 * structures.
1567 *
1568 * flags - flags sent or received with the user message, see Section
1569 * 5 for complete description of the flags.
1570 *
1571 * Note: This function could use a rewrite especially when explicit
1572 * connect support comes in.
1573 */
1574/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1575
1576static int sctp_msghdr_parse(const struct msghdr *msg,
1577 struct sctp_cmsgs *cmsgs);
1578
1579static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1580 struct sctp_sndrcvinfo *srinfo,
1581 const struct msghdr *msg, size_t msg_len)
1582{
1583 __u16 sflags;
1584 int err;
1585
1586 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1587 return -EPIPE;
1588
1589 if (msg_len > sk->sk_sndbuf)
1590 return -EMSGSIZE;
1591
1592 memset(cmsgs, 0, sizeof(*cmsgs));
1593 err = sctp_msghdr_parse(msg, cmsgs);
1594 if (err) {
1595 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1596 return err;
1597 }
1598
1599 memset(srinfo, 0, sizeof(*srinfo));
1600 if (cmsgs->srinfo) {
1601 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1602 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1603 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1604 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1605 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1606 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1607 }
1608
1609 if (cmsgs->sinfo) {
1610 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1611 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1612 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1613 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1614 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1615 }
1616
1617 if (cmsgs->prinfo) {
1618 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1619 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1620 cmsgs->prinfo->pr_policy);
1621 }
1622
1623 sflags = srinfo->sinfo_flags;
1624 if (!sflags && msg_len)
1625 return 0;
1626
1627 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1628 return -EINVAL;
1629
1630 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1631 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1632 return -EINVAL;
1633
1634 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1635 return -EINVAL;
1636
1637 return 0;
1638}
1639
1640static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1641 struct sctp_cmsgs *cmsgs,
1642 union sctp_addr *daddr,
1643 struct sctp_transport **tp)
1644{
1645 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1646 struct sctp_association *asoc;
1647 struct cmsghdr *cmsg;
1648 __be32 flowinfo = 0;
1649 struct sctp_af *af;
1650 int err;
1651
1652 *tp = NULL;
1653
1654 if (sflags & (SCTP_EOF | SCTP_ABORT))
1655 return -EINVAL;
1656
1657 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1658 sctp_sstate(sk, CLOSING)))
1659 return -EADDRNOTAVAIL;
1660
1661 /* Label connection socket for first association 1-to-many
1662 * style for client sequence socket()->sendmsg(). This
1663 * needs to be done before sctp_assoc_add_peer() as that will
1664 * set up the initial packet that needs to account for any
1665 * security ip options (CIPSO/CALIPSO) added to the packet.
1666 */
1667 af = sctp_get_af_specific(daddr->sa.sa_family);
1668 if (!af)
1669 return -EINVAL;
1670 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1671 (struct sockaddr *)daddr,
1672 af->sockaddr_len);
1673 if (err < 0)
1674 return err;
1675
1676 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1677 if (err)
1678 return err;
1679 asoc = (*tp)->asoc;
1680
1681 if (!cmsgs->addrs_msg)
1682 return 0;
1683
1684 if (daddr->sa.sa_family == AF_INET6)
1685 flowinfo = daddr->v6.sin6_flowinfo;
1686
1687 /* sendv addr list parse */
1688 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1689 union sctp_addr _daddr;
1690 int dlen;
1691
1692 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1693 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1694 cmsg->cmsg_type != SCTP_DSTADDRV6))
1695 continue;
1696
1697 daddr = &_daddr;
1698 memset(daddr, 0, sizeof(*daddr));
1699 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1700 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1701 if (dlen < sizeof(struct in_addr)) {
1702 err = -EINVAL;
1703 goto free;
1704 }
1705
1706 dlen = sizeof(struct in_addr);
1707 daddr->v4.sin_family = AF_INET;
1708 daddr->v4.sin_port = htons(asoc->peer.port);
1709 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1710 } else {
1711 if (dlen < sizeof(struct in6_addr)) {
1712 err = -EINVAL;
1713 goto free;
1714 }
1715
1716 dlen = sizeof(struct in6_addr);
1717 daddr->v6.sin6_flowinfo = flowinfo;
1718 daddr->v6.sin6_family = AF_INET6;
1719 daddr->v6.sin6_port = htons(asoc->peer.port);
1720 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1721 }
1722
1723 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1724 if (err)
1725 goto free;
1726 }
1727
1728 return 0;
1729
1730free:
1731 sctp_association_free(asoc);
1732 return err;
1733}
1734
1735static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1736 __u16 sflags, struct msghdr *msg,
1737 size_t msg_len)
1738{
1739 struct sock *sk = asoc->base.sk;
1740 struct net *net = sock_net(sk);
1741
1742 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1743 return -EPIPE;
1744
1745 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1746 !sctp_state(asoc, ESTABLISHED))
1747 return 0;
1748
1749 if (sflags & SCTP_EOF) {
1750 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1751 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1752
1753 return 0;
1754 }
1755
1756 if (sflags & SCTP_ABORT) {
1757 struct sctp_chunk *chunk;
1758
1759 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1760 if (!chunk)
1761 return -ENOMEM;
1762
1763 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1764 sctp_primitive_ABORT(net, asoc, chunk);
1765 iov_iter_revert(&msg->msg_iter, msg_len);
1766
1767 return 0;
1768 }
1769
1770 return 1;
1771}
1772
1773static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1774 struct msghdr *msg, size_t msg_len,
1775 struct sctp_transport *transport,
1776 struct sctp_sndrcvinfo *sinfo)
1777{
1778 struct sock *sk = asoc->base.sk;
1779 struct sctp_sock *sp = sctp_sk(sk);
1780 struct net *net = sock_net(sk);
1781 struct sctp_datamsg *datamsg;
1782 bool wait_connect = false;
1783 struct sctp_chunk *chunk;
1784 long timeo;
1785 int err;
1786
1787 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1788 err = -EINVAL;
1789 goto err;
1790 }
1791
1792 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1793 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1794 if (err)
1795 goto err;
1796 }
1797
1798 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1799 err = -EMSGSIZE;
1800 goto err;
1801 }
1802
1803 if (asoc->pmtu_pending) {
1804 if (sp->param_flags & SPP_PMTUD_ENABLE)
1805 sctp_assoc_sync_pmtu(asoc);
1806 asoc->pmtu_pending = 0;
1807 }
1808
1809 if (sctp_wspace(asoc) < (int)msg_len)
1810 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1811
1812 if (sk_under_memory_pressure(sk))
1813 sk_mem_reclaim(sk);
1814
1815 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1816 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1817 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1818 if (err)
1819 goto err;
1820 }
1821
1822 if (sctp_state(asoc, CLOSED)) {
1823 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1824 if (err)
1825 goto err;
1826
1827 if (asoc->ep->intl_enable) {
1828 timeo = sock_sndtimeo(sk, 0);
1829 err = sctp_wait_for_connect(asoc, &timeo);
1830 if (err) {
1831 err = -ESRCH;
1832 goto err;
1833 }
1834 } else {
1835 wait_connect = true;
1836 }
1837
1838 pr_debug("%s: we associated primitively\n", __func__);
1839 }
1840
1841 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1842 if (IS_ERR(datamsg)) {
1843 err = PTR_ERR(datamsg);
1844 goto err;
1845 }
1846
1847 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1848
1849 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1850 sctp_chunk_hold(chunk);
1851 sctp_set_owner_w(chunk);
1852 chunk->transport = transport;
1853 }
1854
1855 err = sctp_primitive_SEND(net, asoc, datamsg);
1856 if (err) {
1857 sctp_datamsg_free(datamsg);
1858 goto err;
1859 }
1860
1861 pr_debug("%s: we sent primitively\n", __func__);
1862
1863 sctp_datamsg_put(datamsg);
1864
1865 if (unlikely(wait_connect)) {
1866 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1867 sctp_wait_for_connect(asoc, &timeo);
1868 }
1869
1870 err = msg_len;
1871
1872err:
1873 return err;
1874}
1875
1876static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1877 const struct msghdr *msg,
1878 struct sctp_cmsgs *cmsgs)
1879{
1880 union sctp_addr *daddr = NULL;
1881 int err;
1882
1883 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1884 int len = msg->msg_namelen;
1885
1886 if (len > sizeof(*daddr))
1887 len = sizeof(*daddr);
1888
1889 daddr = (union sctp_addr *)msg->msg_name;
1890
1891 err = sctp_verify_addr(sk, daddr, len);
1892 if (err)
1893 return ERR_PTR(err);
1894 }
1895
1896 return daddr;
1897}
1898
1899static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1900 struct sctp_sndrcvinfo *sinfo,
1901 struct sctp_cmsgs *cmsgs)
1902{
1903 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1904 sinfo->sinfo_stream = asoc->default_stream;
1905 sinfo->sinfo_ppid = asoc->default_ppid;
1906 sinfo->sinfo_context = asoc->default_context;
1907 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1908
1909 if (!cmsgs->prinfo)
1910 sinfo->sinfo_flags = asoc->default_flags;
1911 }
1912
1913 if (!cmsgs->srinfo && !cmsgs->prinfo)
1914 sinfo->sinfo_timetolive = asoc->default_timetolive;
1915
1916 if (cmsgs->authinfo) {
1917 /* Reuse sinfo_tsn to indicate that authinfo was set and
1918 * sinfo_ssn to save the keyid on tx path.
1919 */
1920 sinfo->sinfo_tsn = 1;
1921 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1922 }
1923}
1924
1925static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1926{
1927 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1928 struct sctp_transport *transport = NULL;
1929 struct sctp_sndrcvinfo _sinfo, *sinfo;
1930 struct sctp_association *asoc, *tmp;
1931 struct sctp_cmsgs cmsgs;
1932 union sctp_addr *daddr;
1933 bool new = false;
1934 __u16 sflags;
1935 int err;
1936
1937 /* Parse and get snd_info */
1938 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1939 if (err)
1940 goto out;
1941
1942 sinfo = &_sinfo;
1943 sflags = sinfo->sinfo_flags;
1944
1945 /* Get daddr from msg */
1946 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1947 if (IS_ERR(daddr)) {
1948 err = PTR_ERR(daddr);
1949 goto out;
1950 }
1951
1952 lock_sock(sk);
1953
1954 /* SCTP_SENDALL process */
1955 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1956 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1957 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1958 msg_len);
1959 if (err == 0)
1960 continue;
1961 if (err < 0)
1962 goto out_unlock;
1963
1964 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1965
1966 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1967 NULL, sinfo);
1968 if (err < 0)
1969 goto out_unlock;
1970
1971 iov_iter_revert(&msg->msg_iter, err);
1972 }
1973
1974 goto out_unlock;
1975 }
1976
1977 /* Get and check or create asoc */
1978 if (daddr) {
1979 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1980 if (asoc) {
1981 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1982 msg_len);
1983 if (err <= 0)
1984 goto out_unlock;
1985 } else {
1986 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1987 &transport);
1988 if (err)
1989 goto out_unlock;
1990
1991 asoc = transport->asoc;
1992 new = true;
1993 }
1994
1995 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
1996 transport = NULL;
1997 } else {
1998 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
1999 if (!asoc) {
2000 err = -EPIPE;
2001 goto out_unlock;
2002 }
2003
2004 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2005 if (err <= 0)
2006 goto out_unlock;
2007 }
2008
2009 /* Update snd_info with the asoc */
2010 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2011
2012 /* Send msg to the asoc */
2013 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2014 if (err < 0 && err != -ESRCH && new)
2015 sctp_association_free(asoc);
2016
2017out_unlock:
2018 release_sock(sk);
2019out:
2020 return sctp_error(sk, msg->msg_flags, err);
2021}
2022
2023/* This is an extended version of skb_pull() that removes the data from the
2024 * start of a skb even when data is spread across the list of skb's in the
2025 * frag_list. len specifies the total amount of data that needs to be removed.
2026 * when 'len' bytes could be removed from the skb, it returns 0.
2027 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2028 * could not be removed.
2029 */
2030static int sctp_skb_pull(struct sk_buff *skb, int len)
2031{
2032 struct sk_buff *list;
2033 int skb_len = skb_headlen(skb);
2034 int rlen;
2035
2036 if (len <= skb_len) {
2037 __skb_pull(skb, len);
2038 return 0;
2039 }
2040 len -= skb_len;
2041 __skb_pull(skb, skb_len);
2042
2043 skb_walk_frags(skb, list) {
2044 rlen = sctp_skb_pull(list, len);
2045 skb->len -= (len-rlen);
2046 skb->data_len -= (len-rlen);
2047
2048 if (!rlen)
2049 return 0;
2050
2051 len = rlen;
2052 }
2053
2054 return len;
2055}
2056
2057/* API 3.1.3 recvmsg() - UDP Style Syntax
2058 *
2059 * ssize_t recvmsg(int socket, struct msghdr *message,
2060 * int flags);
2061 *
2062 * socket - the socket descriptor of the endpoint.
2063 * message - pointer to the msghdr structure which contains a single
2064 * user message and possibly some ancillary data.
2065 *
2066 * See Section 5 for complete description of the data
2067 * structures.
2068 *
2069 * flags - flags sent or received with the user message, see Section
2070 * 5 for complete description of the flags.
2071 */
2072static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2073 int noblock, int flags, int *addr_len)
2074{
2075 struct sctp_ulpevent *event = NULL;
2076 struct sctp_sock *sp = sctp_sk(sk);
2077 struct sk_buff *skb, *head_skb;
2078 int copied;
2079 int err = 0;
2080 int skb_len;
2081
2082 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2083 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2084 addr_len);
2085
2086 lock_sock(sk);
2087
2088 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2089 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2090 err = -ENOTCONN;
2091 goto out;
2092 }
2093
2094 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2095 if (!skb)
2096 goto out;
2097
2098 /* Get the total length of the skb including any skb's in the
2099 * frag_list.
2100 */
2101 skb_len = skb->len;
2102
2103 copied = skb_len;
2104 if (copied > len)
2105 copied = len;
2106
2107 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2108
2109 event = sctp_skb2event(skb);
2110
2111 if (err)
2112 goto out_free;
2113
2114 if (event->chunk && event->chunk->head_skb)
2115 head_skb = event->chunk->head_skb;
2116 else
2117 head_skb = skb;
2118 sock_recv_ts_and_drops(msg, sk, head_skb);
2119 if (sctp_ulpevent_is_notification(event)) {
2120 msg->msg_flags |= MSG_NOTIFICATION;
2121 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2122 } else {
2123 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2124 }
2125
2126 /* Check if we allow SCTP_NXTINFO. */
2127 if (sp->recvnxtinfo)
2128 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2129 /* Check if we allow SCTP_RCVINFO. */
2130 if (sp->recvrcvinfo)
2131 sctp_ulpevent_read_rcvinfo(event, msg);
2132 /* Check if we allow SCTP_SNDRCVINFO. */
2133 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2134 sctp_ulpevent_read_sndrcvinfo(event, msg);
2135
2136 err = copied;
2137
2138 /* If skb's length exceeds the user's buffer, update the skb and
2139 * push it back to the receive_queue so that the next call to
2140 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2141 */
2142 if (skb_len > copied) {
2143 msg->msg_flags &= ~MSG_EOR;
2144 if (flags & MSG_PEEK)
2145 goto out_free;
2146 sctp_skb_pull(skb, copied);
2147 skb_queue_head(&sk->sk_receive_queue, skb);
2148
2149 /* When only partial message is copied to the user, increase
2150 * rwnd by that amount. If all the data in the skb is read,
2151 * rwnd is updated when the event is freed.
2152 */
2153 if (!sctp_ulpevent_is_notification(event))
2154 sctp_assoc_rwnd_increase(event->asoc, copied);
2155 goto out;
2156 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2157 (event->msg_flags & MSG_EOR))
2158 msg->msg_flags |= MSG_EOR;
2159 else
2160 msg->msg_flags &= ~MSG_EOR;
2161
2162out_free:
2163 if (flags & MSG_PEEK) {
2164 /* Release the skb reference acquired after peeking the skb in
2165 * sctp_skb_recv_datagram().
2166 */
2167 kfree_skb(skb);
2168 } else {
2169 /* Free the event which includes releasing the reference to
2170 * the owner of the skb, freeing the skb and updating the
2171 * rwnd.
2172 */
2173 sctp_ulpevent_free(event);
2174 }
2175out:
2176 release_sock(sk);
2177 return err;
2178}
2179
2180/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2181 *
2182 * This option is a on/off flag. If enabled no SCTP message
2183 * fragmentation will be performed. Instead if a message being sent
2184 * exceeds the current PMTU size, the message will NOT be sent and
2185 * instead a error will be indicated to the user.
2186 */
2187static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2188 unsigned int optlen)
2189{
2190 if (optlen < sizeof(int))
2191 return -EINVAL;
2192 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2193 return 0;
2194}
2195
2196static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2197 unsigned int optlen)
2198{
2199 struct sctp_sock *sp = sctp_sk(sk);
2200 struct sctp_association *asoc;
2201 int i;
2202
2203 if (optlen > sizeof(struct sctp_event_subscribe))
2204 return -EINVAL;
2205
2206 for (i = 0; i < optlen; i++)
2207 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2208 sn_type[i]);
2209
2210 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2211 asoc->subscribe = sctp_sk(sk)->subscribe;
2212
2213 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2214 * if there is no data to be sent or retransmit, the stack will
2215 * immediately send up this notification.
2216 */
2217 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2218 struct sctp_ulpevent *event;
2219
2220 asoc = sctp_id2assoc(sk, 0);
2221 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2222 event = sctp_ulpevent_make_sender_dry_event(asoc,
2223 GFP_USER | __GFP_NOWARN);
2224 if (!event)
2225 return -ENOMEM;
2226
2227 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2228 }
2229 }
2230
2231 return 0;
2232}
2233
2234/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2235 *
2236 * This socket option is applicable to the UDP-style socket only. When
2237 * set it will cause associations that are idle for more than the
2238 * specified number of seconds to automatically close. An association
2239 * being idle is defined an association that has NOT sent or received
2240 * user data. The special value of '0' indicates that no automatic
2241 * close of any associations should be performed. The option expects an
2242 * integer defining the number of seconds of idle time before an
2243 * association is closed.
2244 */
2245static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2246 unsigned int optlen)
2247{
2248 struct sctp_sock *sp = sctp_sk(sk);
2249 struct net *net = sock_net(sk);
2250
2251 /* Applicable to UDP-style socket only */
2252 if (sctp_style(sk, TCP))
2253 return -EOPNOTSUPP;
2254 if (optlen != sizeof(int))
2255 return -EINVAL;
2256
2257 sp->autoclose = *optval;
2258 if (sp->autoclose > net->sctp.max_autoclose)
2259 sp->autoclose = net->sctp.max_autoclose;
2260
2261 return 0;
2262}
2263
2264/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2265 *
2266 * Applications can enable or disable heartbeats for any peer address of
2267 * an association, modify an address's heartbeat interval, force a
2268 * heartbeat to be sent immediately, and adjust the address's maximum
2269 * number of retransmissions sent before an address is considered
2270 * unreachable. The following structure is used to access and modify an
2271 * address's parameters:
2272 *
2273 * struct sctp_paddrparams {
2274 * sctp_assoc_t spp_assoc_id;
2275 * struct sockaddr_storage spp_address;
2276 * uint32_t spp_hbinterval;
2277 * uint16_t spp_pathmaxrxt;
2278 * uint32_t spp_pathmtu;
2279 * uint32_t spp_sackdelay;
2280 * uint32_t spp_flags;
2281 * uint32_t spp_ipv6_flowlabel;
2282 * uint8_t spp_dscp;
2283 * };
2284 *
2285 * spp_assoc_id - (one-to-many style socket) This is filled in the
2286 * application, and identifies the association for
2287 * this query.
2288 * spp_address - This specifies which address is of interest.
2289 * spp_hbinterval - This contains the value of the heartbeat interval,
2290 * in milliseconds. If a value of zero
2291 * is present in this field then no changes are to
2292 * be made to this parameter.
2293 * spp_pathmaxrxt - This contains the maximum number of
2294 * retransmissions before this address shall be
2295 * considered unreachable. If a value of zero
2296 * is present in this field then no changes are to
2297 * be made to this parameter.
2298 * spp_pathmtu - When Path MTU discovery is disabled the value
2299 * specified here will be the "fixed" path mtu.
2300 * Note that if the spp_address field is empty
2301 * then all associations on this address will
2302 * have this fixed path mtu set upon them.
2303 *
2304 * spp_sackdelay - When delayed sack is enabled, this value specifies
2305 * the number of milliseconds that sacks will be delayed
2306 * for. This value will apply to all addresses of an
2307 * association if the spp_address field is empty. Note
2308 * also, that if delayed sack is enabled and this
2309 * value is set to 0, no change is made to the last
2310 * recorded delayed sack timer value.
2311 *
2312 * spp_flags - These flags are used to control various features
2313 * on an association. The flag field may contain
2314 * zero or more of the following options.
2315 *
2316 * SPP_HB_ENABLE - Enable heartbeats on the
2317 * specified address. Note that if the address
2318 * field is empty all addresses for the association
2319 * have heartbeats enabled upon them.
2320 *
2321 * SPP_HB_DISABLE - Disable heartbeats on the
2322 * speicifed address. Note that if the address
2323 * field is empty all addresses for the association
2324 * will have their heartbeats disabled. Note also
2325 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2326 * mutually exclusive, only one of these two should
2327 * be specified. Enabling both fields will have
2328 * undetermined results.
2329 *
2330 * SPP_HB_DEMAND - Request a user initiated heartbeat
2331 * to be made immediately.
2332 *
2333 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2334 * heartbeat delayis to be set to the value of 0
2335 * milliseconds.
2336 *
2337 * SPP_PMTUD_ENABLE - This field will enable PMTU
2338 * discovery upon the specified address. Note that
2339 * if the address feild is empty then all addresses
2340 * on the association are effected.
2341 *
2342 * SPP_PMTUD_DISABLE - This field will disable PMTU
2343 * discovery upon the specified address. Note that
2344 * if the address feild is empty then all addresses
2345 * on the association are effected. Not also that
2346 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2347 * exclusive. Enabling both will have undetermined
2348 * results.
2349 *
2350 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2351 * on delayed sack. The time specified in spp_sackdelay
2352 * is used to specify the sack delay for this address. Note
2353 * that if spp_address is empty then all addresses will
2354 * enable delayed sack and take on the sack delay
2355 * value specified in spp_sackdelay.
2356 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2357 * off delayed sack. If the spp_address field is blank then
2358 * delayed sack is disabled for the entire association. Note
2359 * also that this field is mutually exclusive to
2360 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2361 * results.
2362 *
2363 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2364 * setting of the IPV6 flow label value. The value is
2365 * contained in the spp_ipv6_flowlabel field.
2366 * Upon retrieval, this flag will be set to indicate that
2367 * the spp_ipv6_flowlabel field has a valid value returned.
2368 * If a specific destination address is set (in the
2369 * spp_address field), then the value returned is that of
2370 * the address. If just an association is specified (and
2371 * no address), then the association's default flow label
2372 * is returned. If neither an association nor a destination
2373 * is specified, then the socket's default flow label is
2374 * returned. For non-IPv6 sockets, this flag will be left
2375 * cleared.
2376 *
2377 * SPP_DSCP: Setting this flag enables the setting of the
2378 * Differentiated Services Code Point (DSCP) value
2379 * associated with either the association or a specific
2380 * address. The value is obtained in the spp_dscp field.
2381 * Upon retrieval, this flag will be set to indicate that
2382 * the spp_dscp field has a valid value returned. If a
2383 * specific destination address is set when called (in the
2384 * spp_address field), then that specific destination
2385 * address's DSCP value is returned. If just an association
2386 * is specified, then the association's default DSCP is
2387 * returned. If neither an association nor a destination is
2388 * specified, then the socket's default DSCP is returned.
2389 *
2390 * spp_ipv6_flowlabel
2391 * - This field is used in conjunction with the
2392 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2393 * The 20 least significant bits are used for the flow
2394 * label. This setting has precedence over any IPv6-layer
2395 * setting.
2396 *
2397 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2398 * and contains the DSCP. The 6 most significant bits are
2399 * used for the DSCP. This setting has precedence over any
2400 * IPv4- or IPv6- layer setting.
2401 */
2402static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2403 struct sctp_transport *trans,
2404 struct sctp_association *asoc,
2405 struct sctp_sock *sp,
2406 int hb_change,
2407 int pmtud_change,
2408 int sackdelay_change)
2409{
2410 int error;
2411
2412 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2413 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2414 trans->asoc, trans);
2415 if (error)
2416 return error;
2417 }
2418
2419 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2420 * this field is ignored. Note also that a value of zero indicates
2421 * the current setting should be left unchanged.
2422 */
2423 if (params->spp_flags & SPP_HB_ENABLE) {
2424
2425 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2426 * set. This lets us use 0 value when this flag
2427 * is set.
2428 */
2429 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2430 params->spp_hbinterval = 0;
2431
2432 if (params->spp_hbinterval ||
2433 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2434 if (trans) {
2435 trans->hbinterval =
2436 msecs_to_jiffies(params->spp_hbinterval);
2437 } else if (asoc) {
2438 asoc->hbinterval =
2439 msecs_to_jiffies(params->spp_hbinterval);
2440 } else {
2441 sp->hbinterval = params->spp_hbinterval;
2442 }
2443 }
2444 }
2445
2446 if (hb_change) {
2447 if (trans) {
2448 trans->param_flags =
2449 (trans->param_flags & ~SPP_HB) | hb_change;
2450 } else if (asoc) {
2451 asoc->param_flags =
2452 (asoc->param_flags & ~SPP_HB) | hb_change;
2453 } else {
2454 sp->param_flags =
2455 (sp->param_flags & ~SPP_HB) | hb_change;
2456 }
2457 }
2458
2459 /* When Path MTU discovery is disabled the value specified here will
2460 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2461 * include the flag SPP_PMTUD_DISABLE for this field to have any
2462 * effect).
2463 */
2464 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2465 if (trans) {
2466 trans->pathmtu = params->spp_pathmtu;
2467 sctp_assoc_sync_pmtu(asoc);
2468 } else if (asoc) {
2469 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2470 } else {
2471 sp->pathmtu = params->spp_pathmtu;
2472 }
2473 }
2474
2475 if (pmtud_change) {
2476 if (trans) {
2477 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2478 (params->spp_flags & SPP_PMTUD_ENABLE);
2479 trans->param_flags =
2480 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2481 if (update) {
2482 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2483 sctp_assoc_sync_pmtu(asoc);
2484 }
2485 } else if (asoc) {
2486 asoc->param_flags =
2487 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2488 } else {
2489 sp->param_flags =
2490 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2491 }
2492 }
2493
2494 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2495 * value of this field is ignored. Note also that a value of zero
2496 * indicates the current setting should be left unchanged.
2497 */
2498 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2499 if (trans) {
2500 trans->sackdelay =
2501 msecs_to_jiffies(params->spp_sackdelay);
2502 } else if (asoc) {
2503 asoc->sackdelay =
2504 msecs_to_jiffies(params->spp_sackdelay);
2505 } else {
2506 sp->sackdelay = params->spp_sackdelay;
2507 }
2508 }
2509
2510 if (sackdelay_change) {
2511 if (trans) {
2512 trans->param_flags =
2513 (trans->param_flags & ~SPP_SACKDELAY) |
2514 sackdelay_change;
2515 } else if (asoc) {
2516 asoc->param_flags =
2517 (asoc->param_flags & ~SPP_SACKDELAY) |
2518 sackdelay_change;
2519 } else {
2520 sp->param_flags =
2521 (sp->param_flags & ~SPP_SACKDELAY) |
2522 sackdelay_change;
2523 }
2524 }
2525
2526 /* Note that a value of zero indicates the current setting should be
2527 left unchanged.
2528 */
2529 if (params->spp_pathmaxrxt) {
2530 if (trans) {
2531 trans->pathmaxrxt = params->spp_pathmaxrxt;
2532 } else if (asoc) {
2533 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2534 } else {
2535 sp->pathmaxrxt = params->spp_pathmaxrxt;
2536 }
2537 }
2538
2539 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2540 if (trans) {
2541 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2542 trans->flowlabel = params->spp_ipv6_flowlabel &
2543 SCTP_FLOWLABEL_VAL_MASK;
2544 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2545 }
2546 } else if (asoc) {
2547 struct sctp_transport *t;
2548
2549 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2550 transports) {
2551 if (t->ipaddr.sa.sa_family != AF_INET6)
2552 continue;
2553 t->flowlabel = params->spp_ipv6_flowlabel &
2554 SCTP_FLOWLABEL_VAL_MASK;
2555 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2556 }
2557 asoc->flowlabel = params->spp_ipv6_flowlabel &
2558 SCTP_FLOWLABEL_VAL_MASK;
2559 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2560 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2561 sp->flowlabel = params->spp_ipv6_flowlabel &
2562 SCTP_FLOWLABEL_VAL_MASK;
2563 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2564 }
2565 }
2566
2567 if (params->spp_flags & SPP_DSCP) {
2568 if (trans) {
2569 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2570 trans->dscp |= SCTP_DSCP_SET_MASK;
2571 } else if (asoc) {
2572 struct sctp_transport *t;
2573
2574 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2575 transports) {
2576 t->dscp = params->spp_dscp &
2577 SCTP_DSCP_VAL_MASK;
2578 t->dscp |= SCTP_DSCP_SET_MASK;
2579 }
2580 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2581 asoc->dscp |= SCTP_DSCP_SET_MASK;
2582 } else {
2583 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2584 sp->dscp |= SCTP_DSCP_SET_MASK;
2585 }
2586 }
2587
2588 return 0;
2589}
2590
2591static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2592 struct sctp_paddrparams *params,
2593 unsigned int optlen)
2594{
2595 struct sctp_transport *trans = NULL;
2596 struct sctp_association *asoc = NULL;
2597 struct sctp_sock *sp = sctp_sk(sk);
2598 int error;
2599 int hb_change, pmtud_change, sackdelay_change;
2600
2601 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2602 spp_ipv6_flowlabel), 4)) {
2603 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2604 return -EINVAL;
2605 } else if (optlen != sizeof(*params)) {
2606 return -EINVAL;
2607 }
2608
2609 /* Validate flags and value parameters. */
2610 hb_change = params->spp_flags & SPP_HB;
2611 pmtud_change = params->spp_flags & SPP_PMTUD;
2612 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2613
2614 if (hb_change == SPP_HB ||
2615 pmtud_change == SPP_PMTUD ||
2616 sackdelay_change == SPP_SACKDELAY ||
2617 params->spp_sackdelay > 500 ||
2618 (params->spp_pathmtu &&
2619 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2620 return -EINVAL;
2621
2622 /* If an address other than INADDR_ANY is specified, and
2623 * no transport is found, then the request is invalid.
2624 */
2625 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2626 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2627 params->spp_assoc_id);
2628 if (!trans)
2629 return -EINVAL;
2630 }
2631
2632 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2633 * socket is a one to many style socket, and an association
2634 * was not found, then the id was invalid.
2635 */
2636 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2637 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2638 sctp_style(sk, UDP))
2639 return -EINVAL;
2640
2641 /* Heartbeat demand can only be sent on a transport or
2642 * association, but not a socket.
2643 */
2644 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2645 return -EINVAL;
2646
2647 /* Process parameters. */
2648 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2649 hb_change, pmtud_change,
2650 sackdelay_change);
2651
2652 if (error)
2653 return error;
2654
2655 /* If changes are for association, also apply parameters to each
2656 * transport.
2657 */
2658 if (!trans && asoc) {
2659 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2660 transports) {
2661 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2662 hb_change, pmtud_change,
2663 sackdelay_change);
2664 }
2665 }
2666
2667 return 0;
2668}
2669
2670static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2671{
2672 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2673}
2674
2675static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2676{
2677 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2678}
2679
2680static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2681 struct sctp_association *asoc)
2682{
2683 struct sctp_transport *trans;
2684
2685 if (params->sack_delay) {
2686 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2687 asoc->param_flags =
2688 sctp_spp_sackdelay_enable(asoc->param_flags);
2689 }
2690 if (params->sack_freq == 1) {
2691 asoc->param_flags =
2692 sctp_spp_sackdelay_disable(asoc->param_flags);
2693 } else if (params->sack_freq > 1) {
2694 asoc->sackfreq = params->sack_freq;
2695 asoc->param_flags =
2696 sctp_spp_sackdelay_enable(asoc->param_flags);
2697 }
2698
2699 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2700 transports) {
2701 if (params->sack_delay) {
2702 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2703 trans->param_flags =
2704 sctp_spp_sackdelay_enable(trans->param_flags);
2705 }
2706 if (params->sack_freq == 1) {
2707 trans->param_flags =
2708 sctp_spp_sackdelay_disable(trans->param_flags);
2709 } else if (params->sack_freq > 1) {
2710 trans->sackfreq = params->sack_freq;
2711 trans->param_flags =
2712 sctp_spp_sackdelay_enable(trans->param_flags);
2713 }
2714 }
2715}
2716
2717/*
2718 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2719 *
2720 * This option will effect the way delayed acks are performed. This
2721 * option allows you to get or set the delayed ack time, in
2722 * milliseconds. It also allows changing the delayed ack frequency.
2723 * Changing the frequency to 1 disables the delayed sack algorithm. If
2724 * the assoc_id is 0, then this sets or gets the endpoints default
2725 * values. If the assoc_id field is non-zero, then the set or get
2726 * effects the specified association for the one to many model (the
2727 * assoc_id field is ignored by the one to one model). Note that if
2728 * sack_delay or sack_freq are 0 when setting this option, then the
2729 * current values will remain unchanged.
2730 *
2731 * struct sctp_sack_info {
2732 * sctp_assoc_t sack_assoc_id;
2733 * uint32_t sack_delay;
2734 * uint32_t sack_freq;
2735 * };
2736 *
2737 * sack_assoc_id - This parameter, indicates which association the user
2738 * is performing an action upon. Note that if this field's value is
2739 * zero then the endpoints default value is changed (effecting future
2740 * associations only).
2741 *
2742 * sack_delay - This parameter contains the number of milliseconds that
2743 * the user is requesting the delayed ACK timer be set to. Note that
2744 * this value is defined in the standard to be between 200 and 500
2745 * milliseconds.
2746 *
2747 * sack_freq - This parameter contains the number of packets that must
2748 * be received before a sack is sent without waiting for the delay
2749 * timer to expire. The default value for this is 2, setting this
2750 * value to 1 will disable the delayed sack algorithm.
2751 */
2752static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2753 struct sctp_sack_info *params)
2754{
2755 struct sctp_sock *sp = sctp_sk(sk);
2756 struct sctp_association *asoc;
2757
2758 /* Validate value parameter. */
2759 if (params->sack_delay > 500)
2760 return -EINVAL;
2761
2762 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2763 * socket is a one to many style socket, and an association
2764 * was not found, then the id was invalid.
2765 */
2766 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2767 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2768 sctp_style(sk, UDP))
2769 return -EINVAL;
2770
2771 if (asoc) {
2772 sctp_apply_asoc_delayed_ack(params, asoc);
2773
2774 return 0;
2775 }
2776
2777 if (sctp_style(sk, TCP))
2778 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2779
2780 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2781 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2782 if (params->sack_delay) {
2783 sp->sackdelay = params->sack_delay;
2784 sp->param_flags =
2785 sctp_spp_sackdelay_enable(sp->param_flags);
2786 }
2787 if (params->sack_freq == 1) {
2788 sp->param_flags =
2789 sctp_spp_sackdelay_disable(sp->param_flags);
2790 } else if (params->sack_freq > 1) {
2791 sp->sackfreq = params->sack_freq;
2792 sp->param_flags =
2793 sctp_spp_sackdelay_enable(sp->param_flags);
2794 }
2795 }
2796
2797 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2798 params->sack_assoc_id == SCTP_ALL_ASSOC)
2799 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2800 sctp_apply_asoc_delayed_ack(params, asoc);
2801
2802 return 0;
2803}
2804
2805static int sctp_setsockopt_delayed_ack(struct sock *sk,
2806 struct sctp_sack_info *params,
2807 unsigned int optlen)
2808{
2809 if (optlen == sizeof(struct sctp_assoc_value)) {
2810 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2811 struct sctp_sack_info p;
2812
2813 pr_warn_ratelimited(DEPRECATED
2814 "%s (pid %d) "
2815 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2816 "Use struct sctp_sack_info instead\n",
2817 current->comm, task_pid_nr(current));
2818
2819 p.sack_assoc_id = v->assoc_id;
2820 p.sack_delay = v->assoc_value;
2821 p.sack_freq = v->assoc_value ? 0 : 1;
2822 return __sctp_setsockopt_delayed_ack(sk, &p);
2823 }
2824
2825 if (optlen != sizeof(struct sctp_sack_info))
2826 return -EINVAL;
2827 if (params->sack_delay == 0 && params->sack_freq == 0)
2828 return 0;
2829 return __sctp_setsockopt_delayed_ack(sk, params);
2830}
2831
2832/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2833 *
2834 * Applications can specify protocol parameters for the default association
2835 * initialization. The option name argument to setsockopt() and getsockopt()
2836 * is SCTP_INITMSG.
2837 *
2838 * Setting initialization parameters is effective only on an unconnected
2839 * socket (for UDP-style sockets only future associations are effected
2840 * by the change). With TCP-style sockets, this option is inherited by
2841 * sockets derived from a listener socket.
2842 */
2843static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2844 unsigned int optlen)
2845{
2846 struct sctp_sock *sp = sctp_sk(sk);
2847
2848 if (optlen != sizeof(struct sctp_initmsg))
2849 return -EINVAL;
2850
2851 if (sinit->sinit_num_ostreams)
2852 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2853 if (sinit->sinit_max_instreams)
2854 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2855 if (sinit->sinit_max_attempts)
2856 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2857 if (sinit->sinit_max_init_timeo)
2858 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2859
2860 return 0;
2861}
2862
2863/*
2864 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2865 *
2866 * Applications that wish to use the sendto() system call may wish to
2867 * specify a default set of parameters that would normally be supplied
2868 * through the inclusion of ancillary data. This socket option allows
2869 * such an application to set the default sctp_sndrcvinfo structure.
2870 * The application that wishes to use this socket option simply passes
2871 * in to this call the sctp_sndrcvinfo structure defined in Section
2872 * 5.2.2) The input parameters accepted by this call include
2873 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2874 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2875 * to this call if the caller is using the UDP model.
2876 */
2877static int sctp_setsockopt_default_send_param(struct sock *sk,
2878 struct sctp_sndrcvinfo *info,
2879 unsigned int optlen)
2880{
2881 struct sctp_sock *sp = sctp_sk(sk);
2882 struct sctp_association *asoc;
2883
2884 if (optlen != sizeof(*info))
2885 return -EINVAL;
2886 if (info->sinfo_flags &
2887 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2888 SCTP_ABORT | SCTP_EOF))
2889 return -EINVAL;
2890
2891 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2892 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2893 sctp_style(sk, UDP))
2894 return -EINVAL;
2895
2896 if (asoc) {
2897 asoc->default_stream = info->sinfo_stream;
2898 asoc->default_flags = info->sinfo_flags;
2899 asoc->default_ppid = info->sinfo_ppid;
2900 asoc->default_context = info->sinfo_context;
2901 asoc->default_timetolive = info->sinfo_timetolive;
2902
2903 return 0;
2904 }
2905
2906 if (sctp_style(sk, TCP))
2907 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2908
2909 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2910 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2911 sp->default_stream = info->sinfo_stream;
2912 sp->default_flags = info->sinfo_flags;
2913 sp->default_ppid = info->sinfo_ppid;
2914 sp->default_context = info->sinfo_context;
2915 sp->default_timetolive = info->sinfo_timetolive;
2916 }
2917
2918 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2919 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2920 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2921 asoc->default_stream = info->sinfo_stream;
2922 asoc->default_flags = info->sinfo_flags;
2923 asoc->default_ppid = info->sinfo_ppid;
2924 asoc->default_context = info->sinfo_context;
2925 asoc->default_timetolive = info->sinfo_timetolive;
2926 }
2927 }
2928
2929 return 0;
2930}
2931
2932/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2933 * (SCTP_DEFAULT_SNDINFO)
2934 */
2935static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2936 struct sctp_sndinfo *info,
2937 unsigned int optlen)
2938{
2939 struct sctp_sock *sp = sctp_sk(sk);
2940 struct sctp_association *asoc;
2941
2942 if (optlen != sizeof(*info))
2943 return -EINVAL;
2944 if (info->snd_flags &
2945 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2946 SCTP_ABORT | SCTP_EOF))
2947 return -EINVAL;
2948
2949 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2950 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2951 sctp_style(sk, UDP))
2952 return -EINVAL;
2953
2954 if (asoc) {
2955 asoc->default_stream = info->snd_sid;
2956 asoc->default_flags = info->snd_flags;
2957 asoc->default_ppid = info->snd_ppid;
2958 asoc->default_context = info->snd_context;
2959
2960 return 0;
2961 }
2962
2963 if (sctp_style(sk, TCP))
2964 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2965
2966 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2967 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2968 sp->default_stream = info->snd_sid;
2969 sp->default_flags = info->snd_flags;
2970 sp->default_ppid = info->snd_ppid;
2971 sp->default_context = info->snd_context;
2972 }
2973
2974 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2975 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2976 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2977 asoc->default_stream = info->snd_sid;
2978 asoc->default_flags = info->snd_flags;
2979 asoc->default_ppid = info->snd_ppid;
2980 asoc->default_context = info->snd_context;
2981 }
2982 }
2983
2984 return 0;
2985}
2986
2987/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2988 *
2989 * Requests that the local SCTP stack use the enclosed peer address as
2990 * the association primary. The enclosed address must be one of the
2991 * association peer's addresses.
2992 */
2993static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
2994 unsigned int optlen)
2995{
2996 struct sctp_transport *trans;
2997 struct sctp_af *af;
2998 int err;
2999
3000 if (optlen != sizeof(struct sctp_prim))
3001 return -EINVAL;
3002
3003 /* Allow security module to validate address but need address len. */
3004 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3005 if (!af)
3006 return -EINVAL;
3007
3008 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3009 (struct sockaddr *)&prim->ssp_addr,
3010 af->sockaddr_len);
3011 if (err)
3012 return err;
3013
3014 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3015 if (!trans)
3016 return -EINVAL;
3017
3018 sctp_assoc_set_primary(trans->asoc, trans);
3019
3020 return 0;
3021}
3022
3023/*
3024 * 7.1.5 SCTP_NODELAY
3025 *
3026 * Turn on/off any Nagle-like algorithm. This means that packets are
3027 * generally sent as soon as possible and no unnecessary delays are
3028 * introduced, at the cost of more packets in the network. Expects an
3029 * integer boolean flag.
3030 */
3031static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3032 unsigned int optlen)
3033{
3034 if (optlen < sizeof(int))
3035 return -EINVAL;
3036 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3037 return 0;
3038}
3039
3040/*
3041 *
3042 * 7.1.1 SCTP_RTOINFO
3043 *
3044 * The protocol parameters used to initialize and bound retransmission
3045 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3046 * and modify these parameters.
3047 * All parameters are time values, in milliseconds. A value of 0, when
3048 * modifying the parameters, indicates that the current value should not
3049 * be changed.
3050 *
3051 */
3052static int sctp_setsockopt_rtoinfo(struct sock *sk,
3053 struct sctp_rtoinfo *rtoinfo,
3054 unsigned int optlen)
3055{
3056 struct sctp_association *asoc;
3057 unsigned long rto_min, rto_max;
3058 struct sctp_sock *sp = sctp_sk(sk);
3059
3060 if (optlen != sizeof (struct sctp_rtoinfo))
3061 return -EINVAL;
3062
3063 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3064
3065 /* Set the values to the specific association */
3066 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3067 sctp_style(sk, UDP))
3068 return -EINVAL;
3069
3070 rto_max = rtoinfo->srto_max;
3071 rto_min = rtoinfo->srto_min;
3072
3073 if (rto_max)
3074 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3075 else
3076 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3077
3078 if (rto_min)
3079 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3080 else
3081 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3082
3083 if (rto_min > rto_max)
3084 return -EINVAL;
3085
3086 if (asoc) {
3087 if (rtoinfo->srto_initial != 0)
3088 asoc->rto_initial =
3089 msecs_to_jiffies(rtoinfo->srto_initial);
3090 asoc->rto_max = rto_max;
3091 asoc->rto_min = rto_min;
3092 } else {
3093 /* If there is no association or the association-id = 0
3094 * set the values to the endpoint.
3095 */
3096 if (rtoinfo->srto_initial != 0)
3097 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3098 sp->rtoinfo.srto_max = rto_max;
3099 sp->rtoinfo.srto_min = rto_min;
3100 }
3101
3102 return 0;
3103}
3104
3105/*
3106 *
3107 * 7.1.2 SCTP_ASSOCINFO
3108 *
3109 * This option is used to tune the maximum retransmission attempts
3110 * of the association.
3111 * Returns an error if the new association retransmission value is
3112 * greater than the sum of the retransmission value of the peer.
3113 * See [SCTP] for more information.
3114 *
3115 */
3116static int sctp_setsockopt_associnfo(struct sock *sk,
3117 struct sctp_assocparams *assocparams,
3118 unsigned int optlen)
3119{
3120
3121 struct sctp_association *asoc;
3122
3123 if (optlen != sizeof(struct sctp_assocparams))
3124 return -EINVAL;
3125
3126 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3127
3128 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3129 sctp_style(sk, UDP))
3130 return -EINVAL;
3131
3132 /* Set the values to the specific association */
3133 if (asoc) {
3134 if (assocparams->sasoc_asocmaxrxt != 0) {
3135 __u32 path_sum = 0;
3136 int paths = 0;
3137 struct sctp_transport *peer_addr;
3138
3139 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3140 transports) {
3141 path_sum += peer_addr->pathmaxrxt;
3142 paths++;
3143 }
3144
3145 /* Only validate asocmaxrxt if we have more than
3146 * one path/transport. We do this because path
3147 * retransmissions are only counted when we have more
3148 * then one path.
3149 */
3150 if (paths > 1 &&
3151 assocparams->sasoc_asocmaxrxt > path_sum)
3152 return -EINVAL;
3153
3154 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3155 }
3156
3157 if (assocparams->sasoc_cookie_life != 0)
3158 asoc->cookie_life =
3159 ms_to_ktime(assocparams->sasoc_cookie_life);
3160 } else {
3161 /* Set the values to the endpoint */
3162 struct sctp_sock *sp = sctp_sk(sk);
3163
3164 if (assocparams->sasoc_asocmaxrxt != 0)
3165 sp->assocparams.sasoc_asocmaxrxt =
3166 assocparams->sasoc_asocmaxrxt;
3167 if (assocparams->sasoc_cookie_life != 0)
3168 sp->assocparams.sasoc_cookie_life =
3169 assocparams->sasoc_cookie_life;
3170 }
3171 return 0;
3172}
3173
3174/*
3175 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3176 *
3177 * This socket option is a boolean flag which turns on or off mapped V4
3178 * addresses. If this option is turned on and the socket is type
3179 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3180 * If this option is turned off, then no mapping will be done of V4
3181 * addresses and a user will receive both PF_INET6 and PF_INET type
3182 * addresses on the socket.
3183 */
3184static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3185 unsigned int optlen)
3186{
3187 struct sctp_sock *sp = sctp_sk(sk);
3188
3189 if (optlen < sizeof(int))
3190 return -EINVAL;
3191 if (*val)
3192 sp->v4mapped = 1;
3193 else
3194 sp->v4mapped = 0;
3195
3196 return 0;
3197}
3198
3199/*
3200 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3201 * This option will get or set the maximum size to put in any outgoing
3202 * SCTP DATA chunk. If a message is larger than this size it will be
3203 * fragmented by SCTP into the specified size. Note that the underlying
3204 * SCTP implementation may fragment into smaller sized chunks when the
3205 * PMTU of the underlying association is smaller than the value set by
3206 * the user. The default value for this option is '0' which indicates
3207 * the user is NOT limiting fragmentation and only the PMTU will effect
3208 * SCTP's choice of DATA chunk size. Note also that values set larger
3209 * than the maximum size of an IP datagram will effectively let SCTP
3210 * control fragmentation (i.e. the same as setting this option to 0).
3211 *
3212 * The following structure is used to access and modify this parameter:
3213 *
3214 * struct sctp_assoc_value {
3215 * sctp_assoc_t assoc_id;
3216 * uint32_t assoc_value;
3217 * };
3218 *
3219 * assoc_id: This parameter is ignored for one-to-one style sockets.
3220 * For one-to-many style sockets this parameter indicates which
3221 * association the user is performing an action upon. Note that if
3222 * this field's value is zero then the endpoints default value is
3223 * changed (effecting future associations only).
3224 * assoc_value: This parameter specifies the maximum size in bytes.
3225 */
3226static int sctp_setsockopt_maxseg(struct sock *sk,
3227 struct sctp_assoc_value *params,
3228 unsigned int optlen)
3229{
3230 struct sctp_sock *sp = sctp_sk(sk);
3231 struct sctp_association *asoc;
3232 sctp_assoc_t assoc_id;
3233 int val;
3234
3235 if (optlen == sizeof(int)) {
3236 pr_warn_ratelimited(DEPRECATED
3237 "%s (pid %d) "
3238 "Use of int in maxseg socket option.\n"
3239 "Use struct sctp_assoc_value instead\n",
3240 current->comm, task_pid_nr(current));
3241 assoc_id = SCTP_FUTURE_ASSOC;
3242 val = *(int *)params;
3243 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3244 assoc_id = params->assoc_id;
3245 val = params->assoc_value;
3246 } else {
3247 return -EINVAL;
3248 }
3249
3250 asoc = sctp_id2assoc(sk, assoc_id);
3251 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3252 sctp_style(sk, UDP))
3253 return -EINVAL;
3254
3255 if (val) {
3256 int min_len, max_len;
3257 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3258 sizeof(struct sctp_data_chunk);
3259
3260 min_len = sctp_min_frag_point(sp, datasize);
3261 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3262
3263 if (val < min_len || val > max_len)
3264 return -EINVAL;
3265 }
3266
3267 if (asoc) {
3268 asoc->user_frag = val;
3269 sctp_assoc_update_frag_point(asoc);
3270 } else {
3271 sp->user_frag = val;
3272 }
3273
3274 return 0;
3275}
3276
3277
3278/*
3279 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3280 *
3281 * Requests that the peer mark the enclosed address as the association
3282 * primary. The enclosed address must be one of the association's
3283 * locally bound addresses. The following structure is used to make a
3284 * set primary request:
3285 */
3286static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3287 struct sctp_setpeerprim *prim,
3288 unsigned int optlen)
3289{
3290 struct sctp_sock *sp;
3291 struct sctp_association *asoc = NULL;
3292 struct sctp_chunk *chunk;
3293 struct sctp_af *af;
3294 int err;
3295
3296 sp = sctp_sk(sk);
3297
3298 if (!sp->ep->asconf_enable)
3299 return -EPERM;
3300
3301 if (optlen != sizeof(struct sctp_setpeerprim))
3302 return -EINVAL;
3303
3304 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3305 if (!asoc)
3306 return -EINVAL;
3307
3308 if (!asoc->peer.asconf_capable)
3309 return -EPERM;
3310
3311 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3312 return -EPERM;
3313
3314 if (!sctp_state(asoc, ESTABLISHED))
3315 return -ENOTCONN;
3316
3317 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3318 if (!af)
3319 return -EINVAL;
3320
3321 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3322 return -EADDRNOTAVAIL;
3323
3324 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3325 return -EADDRNOTAVAIL;
3326
3327 /* Allow security module to validate address. */
3328 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3329 (struct sockaddr *)&prim->sspp_addr,
3330 af->sockaddr_len);
3331 if (err)
3332 return err;
3333
3334 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3335 chunk = sctp_make_asconf_set_prim(asoc,
3336 (union sctp_addr *)&prim->sspp_addr);
3337 if (!chunk)
3338 return -ENOMEM;
3339
3340 err = sctp_send_asconf(asoc, chunk);
3341
3342 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3343
3344 return err;
3345}
3346
3347static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3348 struct sctp_setadaptation *adapt,
3349 unsigned int optlen)
3350{
3351 if (optlen != sizeof(struct sctp_setadaptation))
3352 return -EINVAL;
3353
3354 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3355
3356 return 0;
3357}
3358
3359/*
3360 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3361 *
3362 * The context field in the sctp_sndrcvinfo structure is normally only
3363 * used when a failed message is retrieved holding the value that was
3364 * sent down on the actual send call. This option allows the setting of
3365 * a default context on an association basis that will be received on
3366 * reading messages from the peer. This is especially helpful in the
3367 * one-2-many model for an application to keep some reference to an
3368 * internal state machine that is processing messages on the
3369 * association. Note that the setting of this value only effects
3370 * received messages from the peer and does not effect the value that is
3371 * saved with outbound messages.
3372 */
3373static int sctp_setsockopt_context(struct sock *sk,
3374 struct sctp_assoc_value *params,
3375 unsigned int optlen)
3376{
3377 struct sctp_sock *sp = sctp_sk(sk);
3378 struct sctp_association *asoc;
3379
3380 if (optlen != sizeof(struct sctp_assoc_value))
3381 return -EINVAL;
3382
3383 asoc = sctp_id2assoc(sk, params->assoc_id);
3384 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3385 sctp_style(sk, UDP))
3386 return -EINVAL;
3387
3388 if (asoc) {
3389 asoc->default_rcv_context = params->assoc_value;
3390
3391 return 0;
3392 }
3393
3394 if (sctp_style(sk, TCP))
3395 params->assoc_id = SCTP_FUTURE_ASSOC;
3396
3397 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3398 params->assoc_id == SCTP_ALL_ASSOC)
3399 sp->default_rcv_context = params->assoc_value;
3400
3401 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3402 params->assoc_id == SCTP_ALL_ASSOC)
3403 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3404 asoc->default_rcv_context = params->assoc_value;
3405
3406 return 0;
3407}
3408
3409/*
3410 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3411 *
3412 * This options will at a minimum specify if the implementation is doing
3413 * fragmented interleave. Fragmented interleave, for a one to many
3414 * socket, is when subsequent calls to receive a message may return
3415 * parts of messages from different associations. Some implementations
3416 * may allow you to turn this value on or off. If so, when turned off,
3417 * no fragment interleave will occur (which will cause a head of line
3418 * blocking amongst multiple associations sharing the same one to many
3419 * socket). When this option is turned on, then each receive call may
3420 * come from a different association (thus the user must receive data
3421 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3422 * association each receive belongs to.
3423 *
3424 * This option takes a boolean value. A non-zero value indicates that
3425 * fragmented interleave is on. A value of zero indicates that
3426 * fragmented interleave is off.
3427 *
3428 * Note that it is important that an implementation that allows this
3429 * option to be turned on, have it off by default. Otherwise an unaware
3430 * application using the one to many model may become confused and act
3431 * incorrectly.
3432 */
3433static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3434 unsigned int optlen)
3435{
3436 if (optlen != sizeof(int))
3437 return -EINVAL;
3438
3439 sctp_sk(sk)->frag_interleave = !!*val;
3440
3441 if (!sctp_sk(sk)->frag_interleave)
3442 sctp_sk(sk)->ep->intl_enable = 0;
3443
3444 return 0;
3445}
3446
3447/*
3448 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3449 * (SCTP_PARTIAL_DELIVERY_POINT)
3450 *
3451 * This option will set or get the SCTP partial delivery point. This
3452 * point is the size of a message where the partial delivery API will be
3453 * invoked to help free up rwnd space for the peer. Setting this to a
3454 * lower value will cause partial deliveries to happen more often. The
3455 * calls argument is an integer that sets or gets the partial delivery
3456 * point. Note also that the call will fail if the user attempts to set
3457 * this value larger than the socket receive buffer size.
3458 *
3459 * Note that any single message having a length smaller than or equal to
3460 * the SCTP partial delivery point will be delivered in one single read
3461 * call as long as the user provided buffer is large enough to hold the
3462 * message.
3463 */
3464static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3465 unsigned int optlen)
3466{
3467 if (optlen != sizeof(u32))
3468 return -EINVAL;
3469
3470 /* Note: We double the receive buffer from what the user sets
3471 * it to be, also initial rwnd is based on rcvbuf/2.
3472 */
3473 if (*val > (sk->sk_rcvbuf >> 1))
3474 return -EINVAL;
3475
3476 sctp_sk(sk)->pd_point = *val;
3477
3478 return 0; /* is this the right error code? */
3479}
3480
3481/*
3482 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3483 *
3484 * This option will allow a user to change the maximum burst of packets
3485 * that can be emitted by this association. Note that the default value
3486 * is 4, and some implementations may restrict this setting so that it
3487 * can only be lowered.
3488 *
3489 * NOTE: This text doesn't seem right. Do this on a socket basis with
3490 * future associations inheriting the socket value.
3491 */
3492static int sctp_setsockopt_maxburst(struct sock *sk,
3493 struct sctp_assoc_value *params,
3494 unsigned int optlen)
3495{
3496 struct sctp_sock *sp = sctp_sk(sk);
3497 struct sctp_association *asoc;
3498 sctp_assoc_t assoc_id;
3499 u32 assoc_value;
3500
3501 if (optlen == sizeof(int)) {
3502 pr_warn_ratelimited(DEPRECATED
3503 "%s (pid %d) "
3504 "Use of int in max_burst socket option deprecated.\n"
3505 "Use struct sctp_assoc_value instead\n",
3506 current->comm, task_pid_nr(current));
3507 assoc_id = SCTP_FUTURE_ASSOC;
3508 assoc_value = *((int *)params);
3509 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3510 assoc_id = params->assoc_id;
3511 assoc_value = params->assoc_value;
3512 } else
3513 return -EINVAL;
3514
3515 asoc = sctp_id2assoc(sk, assoc_id);
3516 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3517 return -EINVAL;
3518
3519 if (asoc) {
3520 asoc->max_burst = assoc_value;
3521
3522 return 0;
3523 }
3524
3525 if (sctp_style(sk, TCP))
3526 assoc_id = SCTP_FUTURE_ASSOC;
3527
3528 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3529 sp->max_burst = assoc_value;
3530
3531 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3532 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3533 asoc->max_burst = assoc_value;
3534
3535 return 0;
3536}
3537
3538/*
3539 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3540 *
3541 * This set option adds a chunk type that the user is requesting to be
3542 * received only in an authenticated way. Changes to the list of chunks
3543 * will only effect future associations on the socket.
3544 */
3545static int sctp_setsockopt_auth_chunk(struct sock *sk,
3546 struct sctp_authchunk *val,
3547 unsigned int optlen)
3548{
3549 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3550
3551 if (!ep->auth_enable)
3552 return -EACCES;
3553
3554 if (optlen != sizeof(struct sctp_authchunk))
3555 return -EINVAL;
3556
3557 switch (val->sauth_chunk) {
3558 case SCTP_CID_INIT:
3559 case SCTP_CID_INIT_ACK:
3560 case SCTP_CID_SHUTDOWN_COMPLETE:
3561 case SCTP_CID_AUTH:
3562 return -EINVAL;
3563 }
3564
3565 /* add this chunk id to the endpoint */
3566 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3567}
3568
3569/*
3570 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3571 *
3572 * This option gets or sets the list of HMAC algorithms that the local
3573 * endpoint requires the peer to use.
3574 */
3575static int sctp_setsockopt_hmac_ident(struct sock *sk,
3576 struct sctp_hmacalgo *hmacs,
3577 unsigned int optlen)
3578{
3579 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3580 u32 idents;
3581
3582 if (!ep->auth_enable)
3583 return -EACCES;
3584
3585 if (optlen < sizeof(struct sctp_hmacalgo))
3586 return -EINVAL;
3587 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3588 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3589
3590 idents = hmacs->shmac_num_idents;
3591 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3592 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3593 return -EINVAL;
3594
3595 return sctp_auth_ep_set_hmacs(ep, hmacs);
3596}
3597
3598/*
3599 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3600 *
3601 * This option will set a shared secret key which is used to build an
3602 * association shared key.
3603 */
3604static int sctp_setsockopt_auth_key(struct sock *sk,
3605 struct sctp_authkey *authkey,
3606 unsigned int optlen)
3607{
3608 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3609 struct sctp_association *asoc;
3610 int ret = -EINVAL;
3611
3612 if (optlen <= sizeof(struct sctp_authkey))
3613 return -EINVAL;
3614 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3615 * this.
3616 */
3617 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3618
3619 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3620 goto out;
3621
3622 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3623 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3624 sctp_style(sk, UDP))
3625 goto out;
3626
3627 if (asoc) {
3628 ret = sctp_auth_set_key(ep, asoc, authkey);
3629 goto out;
3630 }
3631
3632 if (sctp_style(sk, TCP))
3633 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3634
3635 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3636 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3637 ret = sctp_auth_set_key(ep, asoc, authkey);
3638 if (ret)
3639 goto out;
3640 }
3641
3642 ret = 0;
3643
3644 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3645 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3646 list_for_each_entry(asoc, &ep->asocs, asocs) {
3647 int res = sctp_auth_set_key(ep, asoc, authkey);
3648
3649 if (res && !ret)
3650 ret = res;
3651 }
3652 }
3653
3654out:
3655 memzero_explicit(authkey, optlen);
3656 return ret;
3657}
3658
3659/*
3660 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3661 *
3662 * This option will get or set the active shared key to be used to build
3663 * the association shared key.
3664 */
3665static int sctp_setsockopt_active_key(struct sock *sk,
3666 struct sctp_authkeyid *val,
3667 unsigned int optlen)
3668{
3669 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3670 struct sctp_association *asoc;
3671 int ret = 0;
3672
3673 if (optlen != sizeof(struct sctp_authkeyid))
3674 return -EINVAL;
3675
3676 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3677 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3678 sctp_style(sk, UDP))
3679 return -EINVAL;
3680
3681 if (asoc)
3682 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3683
3684 if (sctp_style(sk, TCP))
3685 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3686
3687 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3688 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3689 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3690 if (ret)
3691 return ret;
3692 }
3693
3694 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3695 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3696 list_for_each_entry(asoc, &ep->asocs, asocs) {
3697 int res = sctp_auth_set_active_key(ep, asoc,
3698 val->scact_keynumber);
3699
3700 if (res && !ret)
3701 ret = res;
3702 }
3703 }
3704
3705 return ret;
3706}
3707
3708/*
3709 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3710 *
3711 * This set option will delete a shared secret key from use.
3712 */
3713static int sctp_setsockopt_del_key(struct sock *sk,
3714 struct sctp_authkeyid *val,
3715 unsigned int optlen)
3716{
3717 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3718 struct sctp_association *asoc;
3719 int ret = 0;
3720
3721 if (optlen != sizeof(struct sctp_authkeyid))
3722 return -EINVAL;
3723
3724 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3725 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3726 sctp_style(sk, UDP))
3727 return -EINVAL;
3728
3729 if (asoc)
3730 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3731
3732 if (sctp_style(sk, TCP))
3733 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3734
3735 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3736 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3737 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3738 if (ret)
3739 return ret;
3740 }
3741
3742 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3743 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3744 list_for_each_entry(asoc, &ep->asocs, asocs) {
3745 int res = sctp_auth_del_key_id(ep, asoc,
3746 val->scact_keynumber);
3747
3748 if (res && !ret)
3749 ret = res;
3750 }
3751 }
3752
3753 return ret;
3754}
3755
3756/*
3757 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3758 *
3759 * This set option will deactivate a shared secret key.
3760 */
3761static int sctp_setsockopt_deactivate_key(struct sock *sk,
3762 struct sctp_authkeyid *val,
3763 unsigned int optlen)
3764{
3765 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3766 struct sctp_association *asoc;
3767 int ret = 0;
3768
3769 if (optlen != sizeof(struct sctp_authkeyid))
3770 return -EINVAL;
3771
3772 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3773 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3774 sctp_style(sk, UDP))
3775 return -EINVAL;
3776
3777 if (asoc)
3778 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3779
3780 if (sctp_style(sk, TCP))
3781 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3782
3783 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3784 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3785 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3786 if (ret)
3787 return ret;
3788 }
3789
3790 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3791 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3792 list_for_each_entry(asoc, &ep->asocs, asocs) {
3793 int res = sctp_auth_deact_key_id(ep, asoc,
3794 val->scact_keynumber);
3795
3796 if (res && !ret)
3797 ret = res;
3798 }
3799 }
3800
3801 return ret;
3802}
3803
3804/*
3805 * 8.1.23 SCTP_AUTO_ASCONF
3806 *
3807 * This option will enable or disable the use of the automatic generation of
3808 * ASCONF chunks to add and delete addresses to an existing association. Note
3809 * that this option has two caveats namely: a) it only affects sockets that
3810 * are bound to all addresses available to the SCTP stack, and b) the system
3811 * administrator may have an overriding control that turns the ASCONF feature
3812 * off no matter what setting the socket option may have.
3813 * This option expects an integer boolean flag, where a non-zero value turns on
3814 * the option, and a zero value turns off the option.
3815 * Note. In this implementation, socket operation overrides default parameter
3816 * being set by sysctl as well as FreeBSD implementation
3817 */
3818static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3819 unsigned int optlen)
3820{
3821 struct sctp_sock *sp = sctp_sk(sk);
3822
3823 if (optlen < sizeof(int))
3824 return -EINVAL;
3825 if (!sctp_is_ep_boundall(sk) && *val)
3826 return -EINVAL;
3827 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3828 return 0;
3829
3830 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3831 if (*val == 0 && sp->do_auto_asconf) {
3832 list_del(&sp->auto_asconf_list);
3833 sp->do_auto_asconf = 0;
3834 } else if (*val && !sp->do_auto_asconf) {
3835 list_add_tail(&sp->auto_asconf_list,
3836 &sock_net(sk)->sctp.auto_asconf_splist);
3837 sp->do_auto_asconf = 1;
3838 }
3839 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3840 return 0;
3841}
3842
3843/*
3844 * SCTP_PEER_ADDR_THLDS
3845 *
3846 * This option allows us to alter the partially failed threshold for one or all
3847 * transports in an association. See Section 6.1 of:
3848 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3849 */
3850static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3851 struct sctp_paddrthlds_v2 *val,
3852 unsigned int optlen, bool v2)
3853{
3854 struct sctp_transport *trans;
3855 struct sctp_association *asoc;
3856 int len;
3857
3858 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3859 if (optlen < len)
3860 return -EINVAL;
3861
3862 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3863 return -EINVAL;
3864
3865 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3866 trans = sctp_addr_id2transport(sk, &val->spt_address,
3867 val->spt_assoc_id);
3868 if (!trans)
3869 return -ENOENT;
3870
3871 if (val->spt_pathmaxrxt)
3872 trans->pathmaxrxt = val->spt_pathmaxrxt;
3873 if (v2)
3874 trans->ps_retrans = val->spt_pathcpthld;
3875 trans->pf_retrans = val->spt_pathpfthld;
3876
3877 return 0;
3878 }
3879
3880 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3881 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3882 sctp_style(sk, UDP))
3883 return -EINVAL;
3884
3885 if (asoc) {
3886 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3887 transports) {
3888 if (val->spt_pathmaxrxt)
3889 trans->pathmaxrxt = val->spt_pathmaxrxt;
3890 if (v2)
3891 trans->ps_retrans = val->spt_pathcpthld;
3892 trans->pf_retrans = val->spt_pathpfthld;
3893 }
3894
3895 if (val->spt_pathmaxrxt)
3896 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3897 if (v2)
3898 asoc->ps_retrans = val->spt_pathcpthld;
3899 asoc->pf_retrans = val->spt_pathpfthld;
3900 } else {
3901 struct sctp_sock *sp = sctp_sk(sk);
3902
3903 if (val->spt_pathmaxrxt)
3904 sp->pathmaxrxt = val->spt_pathmaxrxt;
3905 if (v2)
3906 sp->ps_retrans = val->spt_pathcpthld;
3907 sp->pf_retrans = val->spt_pathpfthld;
3908 }
3909
3910 return 0;
3911}
3912
3913static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3914 unsigned int optlen)
3915{
3916 if (optlen < sizeof(int))
3917 return -EINVAL;
3918
3919 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3920
3921 return 0;
3922}
3923
3924static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3925 unsigned int optlen)
3926{
3927 if (optlen < sizeof(int))
3928 return -EINVAL;
3929
3930 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3931
3932 return 0;
3933}
3934
3935static int sctp_setsockopt_pr_supported(struct sock *sk,
3936 struct sctp_assoc_value *params,
3937 unsigned int optlen)
3938{
3939 struct sctp_association *asoc;
3940
3941 if (optlen != sizeof(*params))
3942 return -EINVAL;
3943
3944 asoc = sctp_id2assoc(sk, params->assoc_id);
3945 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3946 sctp_style(sk, UDP))
3947 return -EINVAL;
3948
3949 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3950
3951 return 0;
3952}
3953
3954static int sctp_setsockopt_default_prinfo(struct sock *sk,
3955 struct sctp_default_prinfo *info,
3956 unsigned int optlen)
3957{
3958 struct sctp_sock *sp = sctp_sk(sk);
3959 struct sctp_association *asoc;
3960 int retval = -EINVAL;
3961
3962 if (optlen != sizeof(*info))
3963 goto out;
3964
3965 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3966 goto out;
3967
3968 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3969 info->pr_value = 0;
3970
3971 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3972 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3973 sctp_style(sk, UDP))
3974 goto out;
3975
3976 retval = 0;
3977
3978 if (asoc) {
3979 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3980 asoc->default_timetolive = info->pr_value;
3981 goto out;
3982 }
3983
3984 if (sctp_style(sk, TCP))
3985 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
3986
3987 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
3988 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3989 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
3990 sp->default_timetolive = info->pr_value;
3991 }
3992
3993 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
3994 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3995 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3996 SCTP_PR_SET_POLICY(asoc->default_flags,
3997 info->pr_policy);
3998 asoc->default_timetolive = info->pr_value;
3999 }
4000 }
4001
4002out:
4003 return retval;
4004}
4005
4006static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4007 struct sctp_assoc_value *params,
4008 unsigned int optlen)
4009{
4010 struct sctp_association *asoc;
4011 int retval = -EINVAL;
4012
4013 if (optlen != sizeof(*params))
4014 goto out;
4015
4016 asoc = sctp_id2assoc(sk, params->assoc_id);
4017 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4018 sctp_style(sk, UDP))
4019 goto out;
4020
4021 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4022
4023 retval = 0;
4024
4025out:
4026 return retval;
4027}
4028
4029static int sctp_setsockopt_enable_strreset(struct sock *sk,
4030 struct sctp_assoc_value *params,
4031 unsigned int optlen)
4032{
4033 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4034 struct sctp_association *asoc;
4035 int retval = -EINVAL;
4036
4037 if (optlen != sizeof(*params))
4038 goto out;
4039
4040 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4041 goto out;
4042
4043 asoc = sctp_id2assoc(sk, params->assoc_id);
4044 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4045 sctp_style(sk, UDP))
4046 goto out;
4047
4048 retval = 0;
4049
4050 if (asoc) {
4051 asoc->strreset_enable = params->assoc_value;
4052 goto out;
4053 }
4054
4055 if (sctp_style(sk, TCP))
4056 params->assoc_id = SCTP_FUTURE_ASSOC;
4057
4058 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4059 params->assoc_id == SCTP_ALL_ASSOC)
4060 ep->strreset_enable = params->assoc_value;
4061
4062 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4063 params->assoc_id == SCTP_ALL_ASSOC)
4064 list_for_each_entry(asoc, &ep->asocs, asocs)
4065 asoc->strreset_enable = params->assoc_value;
4066
4067out:
4068 return retval;
4069}
4070
4071static int sctp_setsockopt_reset_streams(struct sock *sk,
4072 struct sctp_reset_streams *params,
4073 unsigned int optlen)
4074{
4075 struct sctp_association *asoc;
4076
4077 if (optlen < sizeof(*params))
4078 return -EINVAL;
4079 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4080 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4081 sizeof(__u16) * sizeof(*params));
4082
4083 if (params->srs_number_streams * sizeof(__u16) >
4084 optlen - sizeof(*params))
4085 return -EINVAL;
4086
4087 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4088 if (!asoc)
4089 return -EINVAL;
4090
4091 return sctp_send_reset_streams(asoc, params);
4092}
4093
4094static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4095 unsigned int optlen)
4096{
4097 struct sctp_association *asoc;
4098
4099 if (optlen != sizeof(*associd))
4100 return -EINVAL;
4101
4102 asoc = sctp_id2assoc(sk, *associd);
4103 if (!asoc)
4104 return -EINVAL;
4105
4106 return sctp_send_reset_assoc(asoc);
4107}
4108
4109static int sctp_setsockopt_add_streams(struct sock *sk,
4110 struct sctp_add_streams *params,
4111 unsigned int optlen)
4112{
4113 struct sctp_association *asoc;
4114
4115 if (optlen != sizeof(*params))
4116 return -EINVAL;
4117
4118 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4119 if (!asoc)
4120 return -EINVAL;
4121
4122 return sctp_send_add_streams(asoc, params);
4123}
4124
4125static int sctp_setsockopt_scheduler(struct sock *sk,
4126 struct sctp_assoc_value *params,
4127 unsigned int optlen)
4128{
4129 struct sctp_sock *sp = sctp_sk(sk);
4130 struct sctp_association *asoc;
4131 int retval = 0;
4132
4133 if (optlen < sizeof(*params))
4134 return -EINVAL;
4135
4136 if (params->assoc_value > SCTP_SS_MAX)
4137 return -EINVAL;
4138
4139 asoc = sctp_id2assoc(sk, params->assoc_id);
4140 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4141 sctp_style(sk, UDP))
4142 return -EINVAL;
4143
4144 if (asoc)
4145 return sctp_sched_set_sched(asoc, params->assoc_value);
4146
4147 if (sctp_style(sk, TCP))
4148 params->assoc_id = SCTP_FUTURE_ASSOC;
4149
4150 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4151 params->assoc_id == SCTP_ALL_ASSOC)
4152 sp->default_ss = params->assoc_value;
4153
4154 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4155 params->assoc_id == SCTP_ALL_ASSOC) {
4156 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4157 int ret = sctp_sched_set_sched(asoc,
4158 params->assoc_value);
4159
4160 if (ret && !retval)
4161 retval = ret;
4162 }
4163 }
4164
4165 return retval;
4166}
4167
4168static int sctp_setsockopt_scheduler_value(struct sock *sk,
4169 struct sctp_stream_value *params,
4170 unsigned int optlen)
4171{
4172 struct sctp_association *asoc;
4173 int retval = -EINVAL;
4174
4175 if (optlen < sizeof(*params))
4176 goto out;
4177
4178 asoc = sctp_id2assoc(sk, params->assoc_id);
4179 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4180 sctp_style(sk, UDP))
4181 goto out;
4182
4183 if (asoc) {
4184 retval = sctp_sched_set_value(asoc, params->stream_id,
4185 params->stream_value, GFP_KERNEL);
4186 goto out;
4187 }
4188
4189 retval = 0;
4190
4191 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4192 int ret = sctp_sched_set_value(asoc, params->stream_id,
4193 params->stream_value,
4194 GFP_KERNEL);
4195 if (ret && !retval) /* try to return the 1st error. */
4196 retval = ret;
4197 }
4198
4199out:
4200 return retval;
4201}
4202
4203static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4204 struct sctp_assoc_value *p,
4205 unsigned int optlen)
4206{
4207 struct sctp_sock *sp = sctp_sk(sk);
4208 struct sctp_association *asoc;
4209
4210 if (optlen < sizeof(*p))
4211 return -EINVAL;
4212
4213 asoc = sctp_id2assoc(sk, p->assoc_id);
4214 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4215 return -EINVAL;
4216
4217 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4218 return -EPERM;
4219 }
4220
4221 sp->ep->intl_enable = !!p->assoc_value;
4222 return 0;
4223}
4224
4225static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4226 unsigned int optlen)
4227{
4228 if (!sctp_style(sk, TCP))
4229 return -EOPNOTSUPP;
4230
4231 if (sctp_sk(sk)->ep->base.bind_addr.port)
4232 return -EFAULT;
4233
4234 if (optlen < sizeof(int))
4235 return -EINVAL;
4236
4237 sctp_sk(sk)->reuse = !!*val;
4238
4239 return 0;
4240}
4241
4242static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4243 struct sctp_association *asoc)
4244{
4245 struct sctp_ulpevent *event;
4246
4247 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4248
4249 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4250 if (sctp_outq_is_empty(&asoc->outqueue)) {
4251 event = sctp_ulpevent_make_sender_dry_event(asoc,
4252 GFP_USER | __GFP_NOWARN);
4253 if (!event)
4254 return -ENOMEM;
4255
4256 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4257 }
4258 }
4259
4260 return 0;
4261}
4262
4263static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4264 unsigned int optlen)
4265{
4266 struct sctp_sock *sp = sctp_sk(sk);
4267 struct sctp_association *asoc;
4268 int retval = 0;
4269
4270 if (optlen < sizeof(*param))
4271 return -EINVAL;
4272
4273 if (param->se_type < SCTP_SN_TYPE_BASE ||
4274 param->se_type > SCTP_SN_TYPE_MAX)
4275 return -EINVAL;
4276
4277 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4278 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4279 sctp_style(sk, UDP))
4280 return -EINVAL;
4281
4282 if (asoc)
4283 return sctp_assoc_ulpevent_type_set(param, asoc);
4284
4285 if (sctp_style(sk, TCP))
4286 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4287
4288 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4289 param->se_assoc_id == SCTP_ALL_ASSOC)
4290 sctp_ulpevent_type_set(&sp->subscribe,
4291 param->se_type, param->se_on);
4292
4293 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4294 param->se_assoc_id == SCTP_ALL_ASSOC) {
4295 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4296 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4297
4298 if (ret && !retval)
4299 retval = ret;
4300 }
4301 }
4302
4303 return retval;
4304}
4305
4306static int sctp_setsockopt_asconf_supported(struct sock *sk,
4307 struct sctp_assoc_value *params,
4308 unsigned int optlen)
4309{
4310 struct sctp_association *asoc;
4311 struct sctp_endpoint *ep;
4312 int retval = -EINVAL;
4313
4314 if (optlen != sizeof(*params))
4315 goto out;
4316
4317 asoc = sctp_id2assoc(sk, params->assoc_id);
4318 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4319 sctp_style(sk, UDP))
4320 goto out;
4321
4322 ep = sctp_sk(sk)->ep;
4323 ep->asconf_enable = !!params->assoc_value;
4324
4325 if (ep->asconf_enable && ep->auth_enable) {
4326 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4327 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4328 }
4329
4330 retval = 0;
4331
4332out:
4333 return retval;
4334}
4335
4336static int sctp_setsockopt_auth_supported(struct sock *sk,
4337 struct sctp_assoc_value *params,
4338 unsigned int optlen)
4339{
4340 struct sctp_association *asoc;
4341 struct sctp_endpoint *ep;
4342 int retval = -EINVAL;
4343
4344 if (optlen != sizeof(*params))
4345 goto out;
4346
4347 asoc = sctp_id2assoc(sk, params->assoc_id);
4348 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4349 sctp_style(sk, UDP))
4350 goto out;
4351
4352 ep = sctp_sk(sk)->ep;
4353 if (params->assoc_value) {
4354 retval = sctp_auth_init(ep, GFP_KERNEL);
4355 if (retval)
4356 goto out;
4357 if (ep->asconf_enable) {
4358 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4359 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4360 }
4361 }
4362
4363 ep->auth_enable = !!params->assoc_value;
4364 retval = 0;
4365
4366out:
4367 return retval;
4368}
4369
4370static int sctp_setsockopt_ecn_supported(struct sock *sk,
4371 struct sctp_assoc_value *params,
4372 unsigned int optlen)
4373{
4374 struct sctp_association *asoc;
4375 int retval = -EINVAL;
4376
4377 if (optlen != sizeof(*params))
4378 goto out;
4379
4380 asoc = sctp_id2assoc(sk, params->assoc_id);
4381 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4382 sctp_style(sk, UDP))
4383 goto out;
4384
4385 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4386 retval = 0;
4387
4388out:
4389 return retval;
4390}
4391
4392static int sctp_setsockopt_pf_expose(struct sock *sk,
4393 struct sctp_assoc_value *params,
4394 unsigned int optlen)
4395{
4396 struct sctp_association *asoc;
4397 int retval = -EINVAL;
4398
4399 if (optlen != sizeof(*params))
4400 goto out;
4401
4402 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4403 goto out;
4404
4405 asoc = sctp_id2assoc(sk, params->assoc_id);
4406 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4407 sctp_style(sk, UDP))
4408 goto out;
4409
4410 if (asoc)
4411 asoc->pf_expose = params->assoc_value;
4412 else
4413 sctp_sk(sk)->pf_expose = params->assoc_value;
4414 retval = 0;
4415
4416out:
4417 return retval;
4418}
4419
4420/* API 6.2 setsockopt(), getsockopt()
4421 *
4422 * Applications use setsockopt() and getsockopt() to set or retrieve
4423 * socket options. Socket options are used to change the default
4424 * behavior of sockets calls. They are described in Section 7.
4425 *
4426 * The syntax is:
4427 *
4428 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4429 * int __user *optlen);
4430 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4431 * int optlen);
4432 *
4433 * sd - the socket descript.
4434 * level - set to IPPROTO_SCTP for all SCTP options.
4435 * optname - the option name.
4436 * optval - the buffer to store the value of the option.
4437 * optlen - the size of the buffer.
4438 */
4439static int sctp_setsockopt(struct sock *sk, int level, int optname,
4440 sockptr_t optval, unsigned int optlen)
4441{
4442 void *kopt = NULL;
4443 int retval = 0;
4444
4445 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4446
4447 /* I can hardly begin to describe how wrong this is. This is
4448 * so broken as to be worse than useless. The API draft
4449 * REALLY is NOT helpful here... I am not convinced that the
4450 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4451 * are at all well-founded.
4452 */
4453 if (level != SOL_SCTP) {
4454 struct sctp_af *af = sctp_sk(sk)->pf->af;
4455
4456 return af->setsockopt(sk, level, optname, optval, optlen);
4457 }
4458
4459 if (optlen > 0) {
4460 kopt = memdup_sockptr(optval, optlen);
4461 if (IS_ERR(kopt))
4462 return PTR_ERR(kopt);
4463 }
4464
4465 lock_sock(sk);
4466
4467 switch (optname) {
4468 case SCTP_SOCKOPT_BINDX_ADD:
4469 /* 'optlen' is the size of the addresses buffer. */
4470 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4471 SCTP_BINDX_ADD_ADDR);
4472 break;
4473
4474 case SCTP_SOCKOPT_BINDX_REM:
4475 /* 'optlen' is the size of the addresses buffer. */
4476 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4477 SCTP_BINDX_REM_ADDR);
4478 break;
4479
4480 case SCTP_SOCKOPT_CONNECTX_OLD:
4481 /* 'optlen' is the size of the addresses buffer. */
4482 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4483 break;
4484
4485 case SCTP_SOCKOPT_CONNECTX:
4486 /* 'optlen' is the size of the addresses buffer. */
4487 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4488 break;
4489
4490 case SCTP_DISABLE_FRAGMENTS:
4491 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4492 break;
4493
4494 case SCTP_EVENTS:
4495 retval = sctp_setsockopt_events(sk, kopt, optlen);
4496 break;
4497
4498 case SCTP_AUTOCLOSE:
4499 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4500 break;
4501
4502 case SCTP_PEER_ADDR_PARAMS:
4503 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4504 break;
4505
4506 case SCTP_DELAYED_SACK:
4507 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4508 break;
4509 case SCTP_PARTIAL_DELIVERY_POINT:
4510 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4511 break;
4512
4513 case SCTP_INITMSG:
4514 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4515 break;
4516 case SCTP_DEFAULT_SEND_PARAM:
4517 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4518 break;
4519 case SCTP_DEFAULT_SNDINFO:
4520 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4521 break;
4522 case SCTP_PRIMARY_ADDR:
4523 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4524 break;
4525 case SCTP_SET_PEER_PRIMARY_ADDR:
4526 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4527 break;
4528 case SCTP_NODELAY:
4529 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4530 break;
4531 case SCTP_RTOINFO:
4532 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4533 break;
4534 case SCTP_ASSOCINFO:
4535 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4536 break;
4537 case SCTP_I_WANT_MAPPED_V4_ADDR:
4538 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4539 break;
4540 case SCTP_MAXSEG:
4541 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4542 break;
4543 case SCTP_ADAPTATION_LAYER:
4544 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4545 break;
4546 case SCTP_CONTEXT:
4547 retval = sctp_setsockopt_context(sk, kopt, optlen);
4548 break;
4549 case SCTP_FRAGMENT_INTERLEAVE:
4550 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4551 break;
4552 case SCTP_MAX_BURST:
4553 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4554 break;
4555 case SCTP_AUTH_CHUNK:
4556 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4557 break;
4558 case SCTP_HMAC_IDENT:
4559 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4560 break;
4561 case SCTP_AUTH_KEY:
4562 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4563 break;
4564 case SCTP_AUTH_ACTIVE_KEY:
4565 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4566 break;
4567 case SCTP_AUTH_DELETE_KEY:
4568 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4569 break;
4570 case SCTP_AUTH_DEACTIVATE_KEY:
4571 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4572 break;
4573 case SCTP_AUTO_ASCONF:
4574 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4575 break;
4576 case SCTP_PEER_ADDR_THLDS:
4577 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4578 false);
4579 break;
4580 case SCTP_PEER_ADDR_THLDS_V2:
4581 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4582 true);
4583 break;
4584 case SCTP_RECVRCVINFO:
4585 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4586 break;
4587 case SCTP_RECVNXTINFO:
4588 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4589 break;
4590 case SCTP_PR_SUPPORTED:
4591 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4592 break;
4593 case SCTP_DEFAULT_PRINFO:
4594 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4595 break;
4596 case SCTP_RECONFIG_SUPPORTED:
4597 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4598 break;
4599 case SCTP_ENABLE_STREAM_RESET:
4600 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4601 break;
4602 case SCTP_RESET_STREAMS:
4603 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4604 break;
4605 case SCTP_RESET_ASSOC:
4606 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4607 break;
4608 case SCTP_ADD_STREAMS:
4609 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4610 break;
4611 case SCTP_STREAM_SCHEDULER:
4612 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4613 break;
4614 case SCTP_STREAM_SCHEDULER_VALUE:
4615 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4616 break;
4617 case SCTP_INTERLEAVING_SUPPORTED:
4618 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4619 optlen);
4620 break;
4621 case SCTP_REUSE_PORT:
4622 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4623 break;
4624 case SCTP_EVENT:
4625 retval = sctp_setsockopt_event(sk, kopt, optlen);
4626 break;
4627 case SCTP_ASCONF_SUPPORTED:
4628 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4629 break;
4630 case SCTP_AUTH_SUPPORTED:
4631 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4632 break;
4633 case SCTP_ECN_SUPPORTED:
4634 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4635 break;
4636 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4637 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4638 break;
4639 default:
4640 retval = -ENOPROTOOPT;
4641 break;
4642 }
4643
4644 release_sock(sk);
4645 kfree(kopt);
4646 return retval;
4647}
4648
4649/* API 3.1.6 connect() - UDP Style Syntax
4650 *
4651 * An application may use the connect() call in the UDP model to initiate an
4652 * association without sending data.
4653 *
4654 * The syntax is:
4655 *
4656 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4657 *
4658 * sd: the socket descriptor to have a new association added to.
4659 *
4660 * nam: the address structure (either struct sockaddr_in or struct
4661 * sockaddr_in6 defined in RFC2553 [7]).
4662 *
4663 * len: the size of the address.
4664 */
4665static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4666 int addr_len, int flags)
4667{
4668 struct sctp_af *af;
4669 int err = -EINVAL;
4670
4671 lock_sock(sk);
4672 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4673 addr, addr_len);
4674
4675 /* Validate addr_len before calling common connect/connectx routine. */
4676 af = sctp_get_af_specific(addr->sa_family);
4677 if (af && addr_len >= af->sockaddr_len)
4678 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4679
4680 release_sock(sk);
4681 return err;
4682}
4683
4684int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4685 int addr_len, int flags)
4686{
4687 if (addr_len < sizeof(uaddr->sa_family))
4688 return -EINVAL;
4689
4690 if (uaddr->sa_family == AF_UNSPEC)
4691 return -EOPNOTSUPP;
4692
4693 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4694}
4695
4696/* FIXME: Write comments. */
4697static int sctp_disconnect(struct sock *sk, int flags)
4698{
4699 return -EOPNOTSUPP; /* STUB */
4700}
4701
4702/* 4.1.4 accept() - TCP Style Syntax
4703 *
4704 * Applications use accept() call to remove an established SCTP
4705 * association from the accept queue of the endpoint. A new socket
4706 * descriptor will be returned from accept() to represent the newly
4707 * formed association.
4708 */
4709static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4710{
4711 struct sctp_sock *sp;
4712 struct sctp_endpoint *ep;
4713 struct sock *newsk = NULL;
4714 struct sctp_association *asoc;
4715 long timeo;
4716 int error = 0;
4717
4718 lock_sock(sk);
4719
4720 sp = sctp_sk(sk);
4721 ep = sp->ep;
4722
4723 if (!sctp_style(sk, TCP)) {
4724 error = -EOPNOTSUPP;
4725 goto out;
4726 }
4727
4728 if (!sctp_sstate(sk, LISTENING)) {
4729 error = -EINVAL;
4730 goto out;
4731 }
4732
4733 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4734
4735 error = sctp_wait_for_accept(sk, timeo);
4736 if (error)
4737 goto out;
4738
4739 /* We treat the list of associations on the endpoint as the accept
4740 * queue and pick the first association on the list.
4741 */
4742 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4743
4744 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4745 if (!newsk) {
4746 error = -ENOMEM;
4747 goto out;
4748 }
4749
4750 /* Populate the fields of the newsk from the oldsk and migrate the
4751 * asoc to the newsk.
4752 */
4753 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4754 if (error) {
4755 sk_common_release(newsk);
4756 newsk = NULL;
4757 }
4758
4759out:
4760 release_sock(sk);
4761 *err = error;
4762 return newsk;
4763}
4764
4765/* The SCTP ioctl handler. */
4766static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4767{
4768 int rc = -ENOTCONN;
4769
4770 lock_sock(sk);
4771
4772 /*
4773 * SEQPACKET-style sockets in LISTENING state are valid, for
4774 * SCTP, so only discard TCP-style sockets in LISTENING state.
4775 */
4776 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4777 goto out;
4778
4779 switch (cmd) {
4780 case SIOCINQ: {
4781 struct sk_buff *skb;
4782 unsigned int amount = 0;
4783
4784 skb = skb_peek(&sk->sk_receive_queue);
4785 if (skb != NULL) {
4786 /*
4787 * We will only return the amount of this packet since
4788 * that is all that will be read.
4789 */
4790 amount = skb->len;
4791 }
4792 rc = put_user(amount, (int __user *)arg);
4793 break;
4794 }
4795 default:
4796 rc = -ENOIOCTLCMD;
4797 break;
4798 }
4799out:
4800 release_sock(sk);
4801 return rc;
4802}
4803
4804/* This is the function which gets called during socket creation to
4805 * initialized the SCTP-specific portion of the sock.
4806 * The sock structure should already be zero-filled memory.
4807 */
4808static int sctp_init_sock(struct sock *sk)
4809{
4810 struct net *net = sock_net(sk);
4811 struct sctp_sock *sp;
4812
4813 pr_debug("%s: sk:%p\n", __func__, sk);
4814
4815 sp = sctp_sk(sk);
4816
4817 /* Initialize the SCTP per socket area. */
4818 switch (sk->sk_type) {
4819 case SOCK_SEQPACKET:
4820 sp->type = SCTP_SOCKET_UDP;
4821 break;
4822 case SOCK_STREAM:
4823 sp->type = SCTP_SOCKET_TCP;
4824 break;
4825 default:
4826 return -ESOCKTNOSUPPORT;
4827 }
4828
4829 sk->sk_gso_type = SKB_GSO_SCTP;
4830
4831 /* Initialize default send parameters. These parameters can be
4832 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4833 */
4834 sp->default_stream = 0;
4835 sp->default_ppid = 0;
4836 sp->default_flags = 0;
4837 sp->default_context = 0;
4838 sp->default_timetolive = 0;
4839
4840 sp->default_rcv_context = 0;
4841 sp->max_burst = net->sctp.max_burst;
4842
4843 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4844
4845 /* Initialize default setup parameters. These parameters
4846 * can be modified with the SCTP_INITMSG socket option or
4847 * overridden by the SCTP_INIT CMSG.
4848 */
4849 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4850 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4851 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4852 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4853
4854 /* Initialize default RTO related parameters. These parameters can
4855 * be modified for with the SCTP_RTOINFO socket option.
4856 */
4857 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4858 sp->rtoinfo.srto_max = net->sctp.rto_max;
4859 sp->rtoinfo.srto_min = net->sctp.rto_min;
4860
4861 /* Initialize default association related parameters. These parameters
4862 * can be modified with the SCTP_ASSOCINFO socket option.
4863 */
4864 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4865 sp->assocparams.sasoc_number_peer_destinations = 0;
4866 sp->assocparams.sasoc_peer_rwnd = 0;
4867 sp->assocparams.sasoc_local_rwnd = 0;
4868 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4869
4870 /* Initialize default event subscriptions. By default, all the
4871 * options are off.
4872 */
4873 sp->subscribe = 0;
4874
4875 /* Default Peer Address Parameters. These defaults can
4876 * be modified via SCTP_PEER_ADDR_PARAMS
4877 */
4878 sp->hbinterval = net->sctp.hb_interval;
4879 sp->pathmaxrxt = net->sctp.max_retrans_path;
4880 sp->pf_retrans = net->sctp.pf_retrans;
4881 sp->ps_retrans = net->sctp.ps_retrans;
4882 sp->pf_expose = net->sctp.pf_expose;
4883 sp->pathmtu = 0; /* allow default discovery */
4884 sp->sackdelay = net->sctp.sack_timeout;
4885 sp->sackfreq = 2;
4886 sp->param_flags = SPP_HB_ENABLE |
4887 SPP_PMTUD_ENABLE |
4888 SPP_SACKDELAY_ENABLE;
4889 sp->default_ss = SCTP_SS_DEFAULT;
4890
4891 /* If enabled no SCTP message fragmentation will be performed.
4892 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4893 */
4894 sp->disable_fragments = 0;
4895
4896 /* Enable Nagle algorithm by default. */
4897 sp->nodelay = 0;
4898
4899 sp->recvrcvinfo = 0;
4900 sp->recvnxtinfo = 0;
4901
4902 /* Enable by default. */
4903 sp->v4mapped = 1;
4904
4905 /* Auto-close idle associations after the configured
4906 * number of seconds. A value of 0 disables this
4907 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4908 * for UDP-style sockets only.
4909 */
4910 sp->autoclose = 0;
4911
4912 /* User specified fragmentation limit. */
4913 sp->user_frag = 0;
4914
4915 sp->adaptation_ind = 0;
4916
4917 sp->pf = sctp_get_pf_specific(sk->sk_family);
4918
4919 /* Control variables for partial data delivery. */
4920 atomic_set(&sp->pd_mode, 0);
4921 skb_queue_head_init(&sp->pd_lobby);
4922 sp->frag_interleave = 0;
4923
4924 /* Create a per socket endpoint structure. Even if we
4925 * change the data structure relationships, this may still
4926 * be useful for storing pre-connect address information.
4927 */
4928 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4929 if (!sp->ep)
4930 return -ENOMEM;
4931
4932 sp->hmac = NULL;
4933
4934 sk->sk_destruct = sctp_destruct_sock;
4935
4936 SCTP_DBG_OBJCNT_INC(sock);
4937
4938 local_bh_disable();
4939 sk_sockets_allocated_inc(sk);
4940 sock_prot_inuse_add(net, sk->sk_prot, 1);
4941
4942 /* Nothing can fail after this block, otherwise
4943 * sctp_destroy_sock() will be called without addr_wq_lock held
4944 */
4945 if (net->sctp.default_auto_asconf) {
4946 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4947 list_add_tail(&sp->auto_asconf_list,
4948 &net->sctp.auto_asconf_splist);
4949 sp->do_auto_asconf = 1;
4950 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4951 } else {
4952 sp->do_auto_asconf = 0;
4953 }
4954
4955 local_bh_enable();
4956
4957 return 0;
4958}
4959
4960/* Cleanup any SCTP per socket resources. Must be called with
4961 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4962 */
4963static void sctp_destroy_sock(struct sock *sk)
4964{
4965 struct sctp_sock *sp;
4966
4967 pr_debug("%s: sk:%p\n", __func__, sk);
4968
4969 /* Release our hold on the endpoint. */
4970 sp = sctp_sk(sk);
4971 /* This could happen during socket init, thus we bail out
4972 * early, since the rest of the below is not setup either.
4973 */
4974 if (sp->ep == NULL)
4975 return;
4976
4977 if (sp->do_auto_asconf) {
4978 sp->do_auto_asconf = 0;
4979 list_del(&sp->auto_asconf_list);
4980 }
4981 sctp_endpoint_free(sp->ep);
4982 local_bh_disable();
4983 sk_sockets_allocated_dec(sk);
4984 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4985 local_bh_enable();
4986}
4987
4988/* Triggered when there are no references on the socket anymore */
4989static void sctp_destruct_sock(struct sock *sk)
4990{
4991 struct sctp_sock *sp = sctp_sk(sk);
4992
4993 /* Free up the HMAC transform. */
4994 crypto_free_shash(sp->hmac);
4995
4996 inet_sock_destruct(sk);
4997}
4998
4999/* API 4.1.7 shutdown() - TCP Style Syntax
5000 * int shutdown(int socket, int how);
5001 *
5002 * sd - the socket descriptor of the association to be closed.
5003 * how - Specifies the type of shutdown. The values are
5004 * as follows:
5005 * SHUT_RD
5006 * Disables further receive operations. No SCTP
5007 * protocol action is taken.
5008 * SHUT_WR
5009 * Disables further send operations, and initiates
5010 * the SCTP shutdown sequence.
5011 * SHUT_RDWR
5012 * Disables further send and receive operations
5013 * and initiates the SCTP shutdown sequence.
5014 */
5015static void sctp_shutdown(struct sock *sk, int how)
5016{
5017 struct net *net = sock_net(sk);
5018 struct sctp_endpoint *ep;
5019
5020 if (!sctp_style(sk, TCP))
5021 return;
5022
5023 ep = sctp_sk(sk)->ep;
5024 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5025 struct sctp_association *asoc;
5026
5027 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5028 asoc = list_entry(ep->asocs.next,
5029 struct sctp_association, asocs);
5030 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5031 }
5032}
5033
5034int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5035 struct sctp_info *info)
5036{
5037 struct sctp_transport *prim;
5038 struct list_head *pos;
5039 int mask;
5040
5041 memset(info, 0, sizeof(*info));
5042 if (!asoc) {
5043 struct sctp_sock *sp = sctp_sk(sk);
5044
5045 info->sctpi_s_autoclose = sp->autoclose;
5046 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5047 info->sctpi_s_pd_point = sp->pd_point;
5048 info->sctpi_s_nodelay = sp->nodelay;
5049 info->sctpi_s_disable_fragments = sp->disable_fragments;
5050 info->sctpi_s_v4mapped = sp->v4mapped;
5051 info->sctpi_s_frag_interleave = sp->frag_interleave;
5052 info->sctpi_s_type = sp->type;
5053
5054 return 0;
5055 }
5056
5057 info->sctpi_tag = asoc->c.my_vtag;
5058 info->sctpi_state = asoc->state;
5059 info->sctpi_rwnd = asoc->a_rwnd;
5060 info->sctpi_unackdata = asoc->unack_data;
5061 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5062 info->sctpi_instrms = asoc->stream.incnt;
5063 info->sctpi_outstrms = asoc->stream.outcnt;
5064 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5065 info->sctpi_inqueue++;
5066 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5067 info->sctpi_outqueue++;
5068 info->sctpi_overall_error = asoc->overall_error_count;
5069 info->sctpi_max_burst = asoc->max_burst;
5070 info->sctpi_maxseg = asoc->frag_point;
5071 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5072 info->sctpi_peer_tag = asoc->c.peer_vtag;
5073
5074 mask = asoc->peer.ecn_capable << 1;
5075 mask = (mask | asoc->peer.ipv4_address) << 1;
5076 mask = (mask | asoc->peer.ipv6_address) << 1;
5077 mask = (mask | asoc->peer.hostname_address) << 1;
5078 mask = (mask | asoc->peer.asconf_capable) << 1;
5079 mask = (mask | asoc->peer.prsctp_capable) << 1;
5080 mask = (mask | asoc->peer.auth_capable);
5081 info->sctpi_peer_capable = mask;
5082 mask = asoc->peer.sack_needed << 1;
5083 mask = (mask | asoc->peer.sack_generation) << 1;
5084 mask = (mask | asoc->peer.zero_window_announced);
5085 info->sctpi_peer_sack = mask;
5086
5087 info->sctpi_isacks = asoc->stats.isacks;
5088 info->sctpi_osacks = asoc->stats.osacks;
5089 info->sctpi_opackets = asoc->stats.opackets;
5090 info->sctpi_ipackets = asoc->stats.ipackets;
5091 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5092 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5093 info->sctpi_idupchunks = asoc->stats.idupchunks;
5094 info->sctpi_gapcnt = asoc->stats.gapcnt;
5095 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5096 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5097 info->sctpi_oodchunks = asoc->stats.oodchunks;
5098 info->sctpi_iodchunks = asoc->stats.iodchunks;
5099 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5100 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5101
5102 prim = asoc->peer.primary_path;
5103 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5104 info->sctpi_p_state = prim->state;
5105 info->sctpi_p_cwnd = prim->cwnd;
5106 info->sctpi_p_srtt = prim->srtt;
5107 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5108 info->sctpi_p_hbinterval = prim->hbinterval;
5109 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5110 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5111 info->sctpi_p_ssthresh = prim->ssthresh;
5112 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5113 info->sctpi_p_flight_size = prim->flight_size;
5114 info->sctpi_p_error = prim->error_count;
5115
5116 return 0;
5117}
5118EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5119
5120/* use callback to avoid exporting the core structure */
5121void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5122{
5123 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5124
5125 rhashtable_walk_start(iter);
5126}
5127
5128void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5129{
5130 rhashtable_walk_stop(iter);
5131 rhashtable_walk_exit(iter);
5132}
5133
5134struct sctp_transport *sctp_transport_get_next(struct net *net,
5135 struct rhashtable_iter *iter)
5136{
5137 struct sctp_transport *t;
5138
5139 t = rhashtable_walk_next(iter);
5140 for (; t; t = rhashtable_walk_next(iter)) {
5141 if (IS_ERR(t)) {
5142 if (PTR_ERR(t) == -EAGAIN)
5143 continue;
5144 break;
5145 }
5146
5147 if (!sctp_transport_hold(t))
5148 continue;
5149
5150 if (net_eq(t->asoc->base.net, net) &&
5151 t->asoc->peer.primary_path == t)
5152 break;
5153
5154 sctp_transport_put(t);
5155 }
5156
5157 return t;
5158}
5159
5160struct sctp_transport *sctp_transport_get_idx(struct net *net,
5161 struct rhashtable_iter *iter,
5162 int pos)
5163{
5164 struct sctp_transport *t;
5165
5166 if (!pos)
5167 return SEQ_START_TOKEN;
5168
5169 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5170 if (!--pos)
5171 break;
5172 sctp_transport_put(t);
5173 }
5174
5175 return t;
5176}
5177
5178int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5179 void *p) {
5180 int err = 0;
5181 int hash = 0;
5182 struct sctp_ep_common *epb;
5183 struct sctp_hashbucket *head;
5184
5185 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5186 hash++, head++) {
5187 read_lock_bh(&head->lock);
5188 sctp_for_each_hentry(epb, &head->chain) {
5189 err = cb(sctp_ep(epb), p);
5190 if (err)
5191 break;
5192 }
5193 read_unlock_bh(&head->lock);
5194 }
5195
5196 return err;
5197}
5198EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5199
5200int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5201 struct net *net,
5202 const union sctp_addr *laddr,
5203 const union sctp_addr *paddr, void *p)
5204{
5205 struct sctp_transport *transport;
5206 int err;
5207
5208 rcu_read_lock();
5209 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5210 rcu_read_unlock();
5211 if (!transport)
5212 return -ENOENT;
5213
5214 err = cb(transport, p);
5215 sctp_transport_put(transport);
5216
5217 return err;
5218}
5219EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5220
5221int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5222 int (*cb_done)(struct sctp_transport *, void *),
5223 struct net *net, int *pos, void *p) {
5224 struct rhashtable_iter hti;
5225 struct sctp_transport *tsp;
5226 int ret;
5227
5228again:
5229 ret = 0;
5230 sctp_transport_walk_start(&hti);
5231
5232 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5233 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5234 ret = cb(tsp, p);
5235 if (ret)
5236 break;
5237 (*pos)++;
5238 sctp_transport_put(tsp);
5239 }
5240 sctp_transport_walk_stop(&hti);
5241
5242 if (ret) {
5243 if (cb_done && !cb_done(tsp, p)) {
5244 (*pos)++;
5245 sctp_transport_put(tsp);
5246 goto again;
5247 }
5248 sctp_transport_put(tsp);
5249 }
5250
5251 return ret;
5252}
5253EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5254
5255/* 7.2.1 Association Status (SCTP_STATUS)
5256
5257 * Applications can retrieve current status information about an
5258 * association, including association state, peer receiver window size,
5259 * number of unacked data chunks, and number of data chunks pending
5260 * receipt. This information is read-only.
5261 */
5262static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5263 char __user *optval,
5264 int __user *optlen)
5265{
5266 struct sctp_status status;
5267 struct sctp_association *asoc = NULL;
5268 struct sctp_transport *transport;
5269 sctp_assoc_t associd;
5270 int retval = 0;
5271
5272 if (len < sizeof(status)) {
5273 retval = -EINVAL;
5274 goto out;
5275 }
5276
5277 len = sizeof(status);
5278 if (copy_from_user(&status, optval, len)) {
5279 retval = -EFAULT;
5280 goto out;
5281 }
5282
5283 associd = status.sstat_assoc_id;
5284 asoc = sctp_id2assoc(sk, associd);
5285 if (!asoc) {
5286 retval = -EINVAL;
5287 goto out;
5288 }
5289
5290 transport = asoc->peer.primary_path;
5291
5292 status.sstat_assoc_id = sctp_assoc2id(asoc);
5293 status.sstat_state = sctp_assoc_to_state(asoc);
5294 status.sstat_rwnd = asoc->peer.rwnd;
5295 status.sstat_unackdata = asoc->unack_data;
5296
5297 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5298 status.sstat_instrms = asoc->stream.incnt;
5299 status.sstat_outstrms = asoc->stream.outcnt;
5300 status.sstat_fragmentation_point = asoc->frag_point;
5301 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5302 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5303 transport->af_specific->sockaddr_len);
5304 /* Map ipv4 address into v4-mapped-on-v6 address. */
5305 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5306 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5307 status.sstat_primary.spinfo_state = transport->state;
5308 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5309 status.sstat_primary.spinfo_srtt = transport->srtt;
5310 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5311 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5312
5313 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5314 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5315
5316 if (put_user(len, optlen)) {
5317 retval = -EFAULT;
5318 goto out;
5319 }
5320
5321 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5322 __func__, len, status.sstat_state, status.sstat_rwnd,
5323 status.sstat_assoc_id);
5324
5325 if (copy_to_user(optval, &status, len)) {
5326 retval = -EFAULT;
5327 goto out;
5328 }
5329
5330out:
5331 return retval;
5332}
5333
5334
5335/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5336 *
5337 * Applications can retrieve information about a specific peer address
5338 * of an association, including its reachability state, congestion
5339 * window, and retransmission timer values. This information is
5340 * read-only.
5341 */
5342static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5343 char __user *optval,
5344 int __user *optlen)
5345{
5346 struct sctp_paddrinfo pinfo;
5347 struct sctp_transport *transport;
5348 int retval = 0;
5349
5350 if (len < sizeof(pinfo)) {
5351 retval = -EINVAL;
5352 goto out;
5353 }
5354
5355 len = sizeof(pinfo);
5356 if (copy_from_user(&pinfo, optval, len)) {
5357 retval = -EFAULT;
5358 goto out;
5359 }
5360
5361 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5362 pinfo.spinfo_assoc_id);
5363 if (!transport) {
5364 retval = -EINVAL;
5365 goto out;
5366 }
5367
5368 if (transport->state == SCTP_PF &&
5369 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5370 retval = -EACCES;
5371 goto out;
5372 }
5373
5374 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5375 pinfo.spinfo_state = transport->state;
5376 pinfo.spinfo_cwnd = transport->cwnd;
5377 pinfo.spinfo_srtt = transport->srtt;
5378 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5379 pinfo.spinfo_mtu = transport->pathmtu;
5380
5381 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5382 pinfo.spinfo_state = SCTP_ACTIVE;
5383
5384 if (put_user(len, optlen)) {
5385 retval = -EFAULT;
5386 goto out;
5387 }
5388
5389 if (copy_to_user(optval, &pinfo, len)) {
5390 retval = -EFAULT;
5391 goto out;
5392 }
5393
5394out:
5395 return retval;
5396}
5397
5398/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5399 *
5400 * This option is a on/off flag. If enabled no SCTP message
5401 * fragmentation will be performed. Instead if a message being sent
5402 * exceeds the current PMTU size, the message will NOT be sent and
5403 * instead a error will be indicated to the user.
5404 */
5405static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5406 char __user *optval, int __user *optlen)
5407{
5408 int val;
5409
5410 if (len < sizeof(int))
5411 return -EINVAL;
5412
5413 len = sizeof(int);
5414 val = (sctp_sk(sk)->disable_fragments == 1);
5415 if (put_user(len, optlen))
5416 return -EFAULT;
5417 if (copy_to_user(optval, &val, len))
5418 return -EFAULT;
5419 return 0;
5420}
5421
5422/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5423 *
5424 * This socket option is used to specify various notifications and
5425 * ancillary data the user wishes to receive.
5426 */
5427static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5428 int __user *optlen)
5429{
5430 struct sctp_event_subscribe subscribe;
5431 __u8 *sn_type = (__u8 *)&subscribe;
5432 int i;
5433
5434 if (len == 0)
5435 return -EINVAL;
5436 if (len > sizeof(struct sctp_event_subscribe))
5437 len = sizeof(struct sctp_event_subscribe);
5438 if (put_user(len, optlen))
5439 return -EFAULT;
5440
5441 for (i = 0; i < len; i++)
5442 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5443 SCTP_SN_TYPE_BASE + i);
5444
5445 if (copy_to_user(optval, &subscribe, len))
5446 return -EFAULT;
5447
5448 return 0;
5449}
5450
5451/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5452 *
5453 * This socket option is applicable to the UDP-style socket only. When
5454 * set it will cause associations that are idle for more than the
5455 * specified number of seconds to automatically close. An association
5456 * being idle is defined an association that has NOT sent or received
5457 * user data. The special value of '0' indicates that no automatic
5458 * close of any associations should be performed. The option expects an
5459 * integer defining the number of seconds of idle time before an
5460 * association is closed.
5461 */
5462static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5463{
5464 /* Applicable to UDP-style socket only */
5465 if (sctp_style(sk, TCP))
5466 return -EOPNOTSUPP;
5467 if (len < sizeof(int))
5468 return -EINVAL;
5469 len = sizeof(int);
5470 if (put_user(len, optlen))
5471 return -EFAULT;
5472 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5473 return -EFAULT;
5474 return 0;
5475}
5476
5477/* Helper routine to branch off an association to a new socket. */
5478int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5479{
5480 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5481 struct sctp_sock *sp = sctp_sk(sk);
5482 struct socket *sock;
5483 int err = 0;
5484
5485 /* Do not peel off from one netns to another one. */
5486 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5487 return -EINVAL;
5488
5489 if (!asoc)
5490 return -EINVAL;
5491
5492 /* An association cannot be branched off from an already peeled-off
5493 * socket, nor is this supported for tcp style sockets.
5494 */
5495 if (!sctp_style(sk, UDP))
5496 return -EINVAL;
5497
5498 /* Create a new socket. */
5499 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5500 if (err < 0)
5501 return err;
5502
5503 sctp_copy_sock(sock->sk, sk, asoc);
5504
5505 /* Make peeled-off sockets more like 1-1 accepted sockets.
5506 * Set the daddr and initialize id to something more random and also
5507 * copy over any ip options.
5508 */
5509 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5510 sp->pf->copy_ip_options(sk, sock->sk);
5511
5512 /* Populate the fields of the newsk from the oldsk and migrate the
5513 * asoc to the newsk.
5514 */
5515 err = sctp_sock_migrate(sk, sock->sk, asoc,
5516 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5517 if (err) {
5518 sock_release(sock);
5519 sock = NULL;
5520 }
5521
5522 *sockp = sock;
5523
5524 return err;
5525}
5526EXPORT_SYMBOL(sctp_do_peeloff);
5527
5528static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5529 struct file **newfile, unsigned flags)
5530{
5531 struct socket *newsock;
5532 int retval;
5533
5534 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5535 if (retval < 0)
5536 goto out;
5537
5538 /* Map the socket to an unused fd that can be returned to the user. */
5539 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5540 if (retval < 0) {
5541 sock_release(newsock);
5542 goto out;
5543 }
5544
5545 *newfile = sock_alloc_file(newsock, 0, NULL);
5546 if (IS_ERR(*newfile)) {
5547 put_unused_fd(retval);
5548 retval = PTR_ERR(*newfile);
5549 *newfile = NULL;
5550 return retval;
5551 }
5552
5553 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5554 retval);
5555
5556 peeloff->sd = retval;
5557
5558 if (flags & SOCK_NONBLOCK)
5559 (*newfile)->f_flags |= O_NONBLOCK;
5560out:
5561 return retval;
5562}
5563
5564static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5565{
5566 sctp_peeloff_arg_t peeloff;
5567 struct file *newfile = NULL;
5568 int retval = 0;
5569
5570 if (len < sizeof(sctp_peeloff_arg_t))
5571 return -EINVAL;
5572 len = sizeof(sctp_peeloff_arg_t);
5573 if (copy_from_user(&peeloff, optval, len))
5574 return -EFAULT;
5575
5576 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5577 if (retval < 0)
5578 goto out;
5579
5580 /* Return the fd mapped to the new socket. */
5581 if (put_user(len, optlen)) {
5582 fput(newfile);
5583 put_unused_fd(retval);
5584 return -EFAULT;
5585 }
5586
5587 if (copy_to_user(optval, &peeloff, len)) {
5588 fput(newfile);
5589 put_unused_fd(retval);
5590 return -EFAULT;
5591 }
5592 fd_install(retval, newfile);
5593out:
5594 return retval;
5595}
5596
5597static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5598 char __user *optval, int __user *optlen)
5599{
5600 sctp_peeloff_flags_arg_t peeloff;
5601 struct file *newfile = NULL;
5602 int retval = 0;
5603
5604 if (len < sizeof(sctp_peeloff_flags_arg_t))
5605 return -EINVAL;
5606 len = sizeof(sctp_peeloff_flags_arg_t);
5607 if (copy_from_user(&peeloff, optval, len))
5608 return -EFAULT;
5609
5610 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5611 &newfile, peeloff.flags);
5612 if (retval < 0)
5613 goto out;
5614
5615 /* Return the fd mapped to the new socket. */
5616 if (put_user(len, optlen)) {
5617 fput(newfile);
5618 put_unused_fd(retval);
5619 return -EFAULT;
5620 }
5621
5622 if (copy_to_user(optval, &peeloff, len)) {
5623 fput(newfile);
5624 put_unused_fd(retval);
5625 return -EFAULT;
5626 }
5627 fd_install(retval, newfile);
5628out:
5629 return retval;
5630}
5631
5632/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5633 *
5634 * Applications can enable or disable heartbeats for any peer address of
5635 * an association, modify an address's heartbeat interval, force a
5636 * heartbeat to be sent immediately, and adjust the address's maximum
5637 * number of retransmissions sent before an address is considered
5638 * unreachable. The following structure is used to access and modify an
5639 * address's parameters:
5640 *
5641 * struct sctp_paddrparams {
5642 * sctp_assoc_t spp_assoc_id;
5643 * struct sockaddr_storage spp_address;
5644 * uint32_t spp_hbinterval;
5645 * uint16_t spp_pathmaxrxt;
5646 * uint32_t spp_pathmtu;
5647 * uint32_t spp_sackdelay;
5648 * uint32_t spp_flags;
5649 * };
5650 *
5651 * spp_assoc_id - (one-to-many style socket) This is filled in the
5652 * application, and identifies the association for
5653 * this query.
5654 * spp_address - This specifies which address is of interest.
5655 * spp_hbinterval - This contains the value of the heartbeat interval,
5656 * in milliseconds. If a value of zero
5657 * is present in this field then no changes are to
5658 * be made to this parameter.
5659 * spp_pathmaxrxt - This contains the maximum number of
5660 * retransmissions before this address shall be
5661 * considered unreachable. If a value of zero
5662 * is present in this field then no changes are to
5663 * be made to this parameter.
5664 * spp_pathmtu - When Path MTU discovery is disabled the value
5665 * specified here will be the "fixed" path mtu.
5666 * Note that if the spp_address field is empty
5667 * then all associations on this address will
5668 * have this fixed path mtu set upon them.
5669 *
5670 * spp_sackdelay - When delayed sack is enabled, this value specifies
5671 * the number of milliseconds that sacks will be delayed
5672 * for. This value will apply to all addresses of an
5673 * association if the spp_address field is empty. Note
5674 * also, that if delayed sack is enabled and this
5675 * value is set to 0, no change is made to the last
5676 * recorded delayed sack timer value.
5677 *
5678 * spp_flags - These flags are used to control various features
5679 * on an association. The flag field may contain
5680 * zero or more of the following options.
5681 *
5682 * SPP_HB_ENABLE - Enable heartbeats on the
5683 * specified address. Note that if the address
5684 * field is empty all addresses for the association
5685 * have heartbeats enabled upon them.
5686 *
5687 * SPP_HB_DISABLE - Disable heartbeats on the
5688 * speicifed address. Note that if the address
5689 * field is empty all addresses for the association
5690 * will have their heartbeats disabled. Note also
5691 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5692 * mutually exclusive, only one of these two should
5693 * be specified. Enabling both fields will have
5694 * undetermined results.
5695 *
5696 * SPP_HB_DEMAND - Request a user initiated heartbeat
5697 * to be made immediately.
5698 *
5699 * SPP_PMTUD_ENABLE - This field will enable PMTU
5700 * discovery upon the specified address. Note that
5701 * if the address feild is empty then all addresses
5702 * on the association are effected.
5703 *
5704 * SPP_PMTUD_DISABLE - This field will disable PMTU
5705 * discovery upon the specified address. Note that
5706 * if the address feild is empty then all addresses
5707 * on the association are effected. Not also that
5708 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5709 * exclusive. Enabling both will have undetermined
5710 * results.
5711 *
5712 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5713 * on delayed sack. The time specified in spp_sackdelay
5714 * is used to specify the sack delay for this address. Note
5715 * that if spp_address is empty then all addresses will
5716 * enable delayed sack and take on the sack delay
5717 * value specified in spp_sackdelay.
5718 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5719 * off delayed sack. If the spp_address field is blank then
5720 * delayed sack is disabled for the entire association. Note
5721 * also that this field is mutually exclusive to
5722 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5723 * results.
5724 *
5725 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5726 * setting of the IPV6 flow label value. The value is
5727 * contained in the spp_ipv6_flowlabel field.
5728 * Upon retrieval, this flag will be set to indicate that
5729 * the spp_ipv6_flowlabel field has a valid value returned.
5730 * If a specific destination address is set (in the
5731 * spp_address field), then the value returned is that of
5732 * the address. If just an association is specified (and
5733 * no address), then the association's default flow label
5734 * is returned. If neither an association nor a destination
5735 * is specified, then the socket's default flow label is
5736 * returned. For non-IPv6 sockets, this flag will be left
5737 * cleared.
5738 *
5739 * SPP_DSCP: Setting this flag enables the setting of the
5740 * Differentiated Services Code Point (DSCP) value
5741 * associated with either the association or a specific
5742 * address. The value is obtained in the spp_dscp field.
5743 * Upon retrieval, this flag will be set to indicate that
5744 * the spp_dscp field has a valid value returned. If a
5745 * specific destination address is set when called (in the
5746 * spp_address field), then that specific destination
5747 * address's DSCP value is returned. If just an association
5748 * is specified, then the association's default DSCP is
5749 * returned. If neither an association nor a destination is
5750 * specified, then the socket's default DSCP is returned.
5751 *
5752 * spp_ipv6_flowlabel
5753 * - This field is used in conjunction with the
5754 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5755 * The 20 least significant bits are used for the flow
5756 * label. This setting has precedence over any IPv6-layer
5757 * setting.
5758 *
5759 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5760 * and contains the DSCP. The 6 most significant bits are
5761 * used for the DSCP. This setting has precedence over any
5762 * IPv4- or IPv6- layer setting.
5763 */
5764static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5765 char __user *optval, int __user *optlen)
5766{
5767 struct sctp_paddrparams params;
5768 struct sctp_transport *trans = NULL;
5769 struct sctp_association *asoc = NULL;
5770 struct sctp_sock *sp = sctp_sk(sk);
5771
5772 if (len >= sizeof(params))
5773 len = sizeof(params);
5774 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5775 spp_ipv6_flowlabel), 4))
5776 len = ALIGN(offsetof(struct sctp_paddrparams,
5777 spp_ipv6_flowlabel), 4);
5778 else
5779 return -EINVAL;
5780
5781 if (copy_from_user(¶ms, optval, len))
5782 return -EFAULT;
5783
5784 /* If an address other than INADDR_ANY is specified, and
5785 * no transport is found, then the request is invalid.
5786 */
5787 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5788 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5789 params.spp_assoc_id);
5790 if (!trans) {
5791 pr_debug("%s: failed no transport\n", __func__);
5792 return -EINVAL;
5793 }
5794 }
5795
5796 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5797 * socket is a one to many style socket, and an association
5798 * was not found, then the id was invalid.
5799 */
5800 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5801 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5802 sctp_style(sk, UDP)) {
5803 pr_debug("%s: failed no association\n", __func__);
5804 return -EINVAL;
5805 }
5806
5807 if (trans) {
5808 /* Fetch transport values. */
5809 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5810 params.spp_pathmtu = trans->pathmtu;
5811 params.spp_pathmaxrxt = trans->pathmaxrxt;
5812 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5813
5814 /*draft-11 doesn't say what to return in spp_flags*/
5815 params.spp_flags = trans->param_flags;
5816 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5817 params.spp_ipv6_flowlabel = trans->flowlabel &
5818 SCTP_FLOWLABEL_VAL_MASK;
5819 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5820 }
5821 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5822 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5823 params.spp_flags |= SPP_DSCP;
5824 }
5825 } else if (asoc) {
5826 /* Fetch association values. */
5827 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5828 params.spp_pathmtu = asoc->pathmtu;
5829 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5830 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5831
5832 /*draft-11 doesn't say what to return in spp_flags*/
5833 params.spp_flags = asoc->param_flags;
5834 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5835 params.spp_ipv6_flowlabel = asoc->flowlabel &
5836 SCTP_FLOWLABEL_VAL_MASK;
5837 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5838 }
5839 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5840 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5841 params.spp_flags |= SPP_DSCP;
5842 }
5843 } else {
5844 /* Fetch socket values. */
5845 params.spp_hbinterval = sp->hbinterval;
5846 params.spp_pathmtu = sp->pathmtu;
5847 params.spp_sackdelay = sp->sackdelay;
5848 params.spp_pathmaxrxt = sp->pathmaxrxt;
5849
5850 /*draft-11 doesn't say what to return in spp_flags*/
5851 params.spp_flags = sp->param_flags;
5852 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5853 params.spp_ipv6_flowlabel = sp->flowlabel &
5854 SCTP_FLOWLABEL_VAL_MASK;
5855 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5856 }
5857 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5858 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5859 params.spp_flags |= SPP_DSCP;
5860 }
5861 }
5862
5863 if (copy_to_user(optval, ¶ms, len))
5864 return -EFAULT;
5865
5866 if (put_user(len, optlen))
5867 return -EFAULT;
5868
5869 return 0;
5870}
5871
5872/*
5873 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5874 *
5875 * This option will effect the way delayed acks are performed. This
5876 * option allows you to get or set the delayed ack time, in
5877 * milliseconds. It also allows changing the delayed ack frequency.
5878 * Changing the frequency to 1 disables the delayed sack algorithm. If
5879 * the assoc_id is 0, then this sets or gets the endpoints default
5880 * values. If the assoc_id field is non-zero, then the set or get
5881 * effects the specified association for the one to many model (the
5882 * assoc_id field is ignored by the one to one model). Note that if
5883 * sack_delay or sack_freq are 0 when setting this option, then the
5884 * current values will remain unchanged.
5885 *
5886 * struct sctp_sack_info {
5887 * sctp_assoc_t sack_assoc_id;
5888 * uint32_t sack_delay;
5889 * uint32_t sack_freq;
5890 * };
5891 *
5892 * sack_assoc_id - This parameter, indicates which association the user
5893 * is performing an action upon. Note that if this field's value is
5894 * zero then the endpoints default value is changed (effecting future
5895 * associations only).
5896 *
5897 * sack_delay - This parameter contains the number of milliseconds that
5898 * the user is requesting the delayed ACK timer be set to. Note that
5899 * this value is defined in the standard to be between 200 and 500
5900 * milliseconds.
5901 *
5902 * sack_freq - This parameter contains the number of packets that must
5903 * be received before a sack is sent without waiting for the delay
5904 * timer to expire. The default value for this is 2, setting this
5905 * value to 1 will disable the delayed sack algorithm.
5906 */
5907static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5908 char __user *optval,
5909 int __user *optlen)
5910{
5911 struct sctp_sack_info params;
5912 struct sctp_association *asoc = NULL;
5913 struct sctp_sock *sp = sctp_sk(sk);
5914
5915 if (len >= sizeof(struct sctp_sack_info)) {
5916 len = sizeof(struct sctp_sack_info);
5917
5918 if (copy_from_user(¶ms, optval, len))
5919 return -EFAULT;
5920 } else if (len == sizeof(struct sctp_assoc_value)) {
5921 pr_warn_ratelimited(DEPRECATED
5922 "%s (pid %d) "
5923 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5924 "Use struct sctp_sack_info instead\n",
5925 current->comm, task_pid_nr(current));
5926 if (copy_from_user(¶ms, optval, len))
5927 return -EFAULT;
5928 } else
5929 return -EINVAL;
5930
5931 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5932 * socket is a one to many style socket, and an association
5933 * was not found, then the id was invalid.
5934 */
5935 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5936 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
5937 sctp_style(sk, UDP))
5938 return -EINVAL;
5939
5940 if (asoc) {
5941 /* Fetch association values. */
5942 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5943 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
5944 params.sack_freq = asoc->sackfreq;
5945
5946 } else {
5947 params.sack_delay = 0;
5948 params.sack_freq = 1;
5949 }
5950 } else {
5951 /* Fetch socket values. */
5952 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5953 params.sack_delay = sp->sackdelay;
5954 params.sack_freq = sp->sackfreq;
5955 } else {
5956 params.sack_delay = 0;
5957 params.sack_freq = 1;
5958 }
5959 }
5960
5961 if (copy_to_user(optval, ¶ms, len))
5962 return -EFAULT;
5963
5964 if (put_user(len, optlen))
5965 return -EFAULT;
5966
5967 return 0;
5968}
5969
5970/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5971 *
5972 * Applications can specify protocol parameters for the default association
5973 * initialization. The option name argument to setsockopt() and getsockopt()
5974 * is SCTP_INITMSG.
5975 *
5976 * Setting initialization parameters is effective only on an unconnected
5977 * socket (for UDP-style sockets only future associations are effected
5978 * by the change). With TCP-style sockets, this option is inherited by
5979 * sockets derived from a listener socket.
5980 */
5981static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5982{
5983 if (len < sizeof(struct sctp_initmsg))
5984 return -EINVAL;
5985 len = sizeof(struct sctp_initmsg);
5986 if (put_user(len, optlen))
5987 return -EFAULT;
5988 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5989 return -EFAULT;
5990 return 0;
5991}
5992
5993
5994static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5995 char __user *optval, int __user *optlen)
5996{
5997 struct sctp_association *asoc;
5998 int cnt = 0;
5999 struct sctp_getaddrs getaddrs;
6000 struct sctp_transport *from;
6001 void __user *to;
6002 union sctp_addr temp;
6003 struct sctp_sock *sp = sctp_sk(sk);
6004 int addrlen;
6005 size_t space_left;
6006 int bytes_copied;
6007
6008 if (len < sizeof(struct sctp_getaddrs))
6009 return -EINVAL;
6010
6011 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6012 return -EFAULT;
6013
6014 /* For UDP-style sockets, id specifies the association to query. */
6015 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6016 if (!asoc)
6017 return -EINVAL;
6018
6019 to = optval + offsetof(struct sctp_getaddrs, addrs);
6020 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6021
6022 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6023 transports) {
6024 memcpy(&temp, &from->ipaddr, sizeof(temp));
6025 addrlen = sctp_get_pf_specific(sk->sk_family)
6026 ->addr_to_user(sp, &temp);
6027 if (space_left < addrlen)
6028 return -ENOMEM;
6029 if (copy_to_user(to, &temp, addrlen))
6030 return -EFAULT;
6031 to += addrlen;
6032 cnt++;
6033 space_left -= addrlen;
6034 }
6035
6036 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6037 return -EFAULT;
6038 bytes_copied = ((char __user *)to) - optval;
6039 if (put_user(bytes_copied, optlen))
6040 return -EFAULT;
6041
6042 return 0;
6043}
6044
6045static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6046 size_t space_left, int *bytes_copied)
6047{
6048 struct sctp_sockaddr_entry *addr;
6049 union sctp_addr temp;
6050 int cnt = 0;
6051 int addrlen;
6052 struct net *net = sock_net(sk);
6053
6054 rcu_read_lock();
6055 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6056 if (!addr->valid)
6057 continue;
6058
6059 if ((PF_INET == sk->sk_family) &&
6060 (AF_INET6 == addr->a.sa.sa_family))
6061 continue;
6062 if ((PF_INET6 == sk->sk_family) &&
6063 inet_v6_ipv6only(sk) &&
6064 (AF_INET == addr->a.sa.sa_family))
6065 continue;
6066 memcpy(&temp, &addr->a, sizeof(temp));
6067 if (!temp.v4.sin_port)
6068 temp.v4.sin_port = htons(port);
6069
6070 addrlen = sctp_get_pf_specific(sk->sk_family)
6071 ->addr_to_user(sctp_sk(sk), &temp);
6072
6073 if (space_left < addrlen) {
6074 cnt = -ENOMEM;
6075 break;
6076 }
6077 memcpy(to, &temp, addrlen);
6078
6079 to += addrlen;
6080 cnt++;
6081 space_left -= addrlen;
6082 *bytes_copied += addrlen;
6083 }
6084 rcu_read_unlock();
6085
6086 return cnt;
6087}
6088
6089
6090static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6091 char __user *optval, int __user *optlen)
6092{
6093 struct sctp_bind_addr *bp;
6094 struct sctp_association *asoc;
6095 int cnt = 0;
6096 struct sctp_getaddrs getaddrs;
6097 struct sctp_sockaddr_entry *addr;
6098 void __user *to;
6099 union sctp_addr temp;
6100 struct sctp_sock *sp = sctp_sk(sk);
6101 int addrlen;
6102 int err = 0;
6103 size_t space_left;
6104 int bytes_copied = 0;
6105 void *addrs;
6106 void *buf;
6107
6108 if (len < sizeof(struct sctp_getaddrs))
6109 return -EINVAL;
6110
6111 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6112 return -EFAULT;
6113
6114 /*
6115 * For UDP-style sockets, id specifies the association to query.
6116 * If the id field is set to the value '0' then the locally bound
6117 * addresses are returned without regard to any particular
6118 * association.
6119 */
6120 if (0 == getaddrs.assoc_id) {
6121 bp = &sctp_sk(sk)->ep->base.bind_addr;
6122 } else {
6123 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6124 if (!asoc)
6125 return -EINVAL;
6126 bp = &asoc->base.bind_addr;
6127 }
6128
6129 to = optval + offsetof(struct sctp_getaddrs, addrs);
6130 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6131
6132 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6133 if (!addrs)
6134 return -ENOMEM;
6135
6136 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6137 * addresses from the global local address list.
6138 */
6139 if (sctp_list_single_entry(&bp->address_list)) {
6140 addr = list_entry(bp->address_list.next,
6141 struct sctp_sockaddr_entry, list);
6142 if (sctp_is_any(sk, &addr->a)) {
6143 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6144 space_left, &bytes_copied);
6145 if (cnt < 0) {
6146 err = cnt;
6147 goto out;
6148 }
6149 goto copy_getaddrs;
6150 }
6151 }
6152
6153 buf = addrs;
6154 /* Protection on the bound address list is not needed since
6155 * in the socket option context we hold a socket lock and
6156 * thus the bound address list can't change.
6157 */
6158 list_for_each_entry(addr, &bp->address_list, list) {
6159 memcpy(&temp, &addr->a, sizeof(temp));
6160 addrlen = sctp_get_pf_specific(sk->sk_family)
6161 ->addr_to_user(sp, &temp);
6162 if (space_left < addrlen) {
6163 err = -ENOMEM; /*fixme: right error?*/
6164 goto out;
6165 }
6166 memcpy(buf, &temp, addrlen);
6167 buf += addrlen;
6168 bytes_copied += addrlen;
6169 cnt++;
6170 space_left -= addrlen;
6171 }
6172
6173copy_getaddrs:
6174 if (copy_to_user(to, addrs, bytes_copied)) {
6175 err = -EFAULT;
6176 goto out;
6177 }
6178 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6179 err = -EFAULT;
6180 goto out;
6181 }
6182 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6183 * but we can't change it anymore.
6184 */
6185 if (put_user(bytes_copied, optlen))
6186 err = -EFAULT;
6187out:
6188 kfree(addrs);
6189 return err;
6190}
6191
6192/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6193 *
6194 * Requests that the local SCTP stack use the enclosed peer address as
6195 * the association primary. The enclosed address must be one of the
6196 * association peer's addresses.
6197 */
6198static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6199 char __user *optval, int __user *optlen)
6200{
6201 struct sctp_prim prim;
6202 struct sctp_association *asoc;
6203 struct sctp_sock *sp = sctp_sk(sk);
6204
6205 if (len < sizeof(struct sctp_prim))
6206 return -EINVAL;
6207
6208 len = sizeof(struct sctp_prim);
6209
6210 if (copy_from_user(&prim, optval, len))
6211 return -EFAULT;
6212
6213 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6214 if (!asoc)
6215 return -EINVAL;
6216
6217 if (!asoc->peer.primary_path)
6218 return -ENOTCONN;
6219
6220 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6221 asoc->peer.primary_path->af_specific->sockaddr_len);
6222
6223 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6224 (union sctp_addr *)&prim.ssp_addr);
6225
6226 if (put_user(len, optlen))
6227 return -EFAULT;
6228 if (copy_to_user(optval, &prim, len))
6229 return -EFAULT;
6230
6231 return 0;
6232}
6233
6234/*
6235 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6236 *
6237 * Requests that the local endpoint set the specified Adaptation Layer
6238 * Indication parameter for all future INIT and INIT-ACK exchanges.
6239 */
6240static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6241 char __user *optval, int __user *optlen)
6242{
6243 struct sctp_setadaptation adaptation;
6244
6245 if (len < sizeof(struct sctp_setadaptation))
6246 return -EINVAL;
6247
6248 len = sizeof(struct sctp_setadaptation);
6249
6250 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6251
6252 if (put_user(len, optlen))
6253 return -EFAULT;
6254 if (copy_to_user(optval, &adaptation, len))
6255 return -EFAULT;
6256
6257 return 0;
6258}
6259
6260/*
6261 *
6262 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6263 *
6264 * Applications that wish to use the sendto() system call may wish to
6265 * specify a default set of parameters that would normally be supplied
6266 * through the inclusion of ancillary data. This socket option allows
6267 * such an application to set the default sctp_sndrcvinfo structure.
6268
6269
6270 * The application that wishes to use this socket option simply passes
6271 * in to this call the sctp_sndrcvinfo structure defined in Section
6272 * 5.2.2) The input parameters accepted by this call include
6273 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6274 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6275 * to this call if the caller is using the UDP model.
6276 *
6277 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6278 */
6279static int sctp_getsockopt_default_send_param(struct sock *sk,
6280 int len, char __user *optval,
6281 int __user *optlen)
6282{
6283 struct sctp_sock *sp = sctp_sk(sk);
6284 struct sctp_association *asoc;
6285 struct sctp_sndrcvinfo info;
6286
6287 if (len < sizeof(info))
6288 return -EINVAL;
6289
6290 len = sizeof(info);
6291
6292 if (copy_from_user(&info, optval, len))
6293 return -EFAULT;
6294
6295 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6296 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6297 sctp_style(sk, UDP))
6298 return -EINVAL;
6299
6300 if (asoc) {
6301 info.sinfo_stream = asoc->default_stream;
6302 info.sinfo_flags = asoc->default_flags;
6303 info.sinfo_ppid = asoc->default_ppid;
6304 info.sinfo_context = asoc->default_context;
6305 info.sinfo_timetolive = asoc->default_timetolive;
6306 } else {
6307 info.sinfo_stream = sp->default_stream;
6308 info.sinfo_flags = sp->default_flags;
6309 info.sinfo_ppid = sp->default_ppid;
6310 info.sinfo_context = sp->default_context;
6311 info.sinfo_timetolive = sp->default_timetolive;
6312 }
6313
6314 if (put_user(len, optlen))
6315 return -EFAULT;
6316 if (copy_to_user(optval, &info, len))
6317 return -EFAULT;
6318
6319 return 0;
6320}
6321
6322/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6323 * (SCTP_DEFAULT_SNDINFO)
6324 */
6325static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6326 char __user *optval,
6327 int __user *optlen)
6328{
6329 struct sctp_sock *sp = sctp_sk(sk);
6330 struct sctp_association *asoc;
6331 struct sctp_sndinfo info;
6332
6333 if (len < sizeof(info))
6334 return -EINVAL;
6335
6336 len = sizeof(info);
6337
6338 if (copy_from_user(&info, optval, len))
6339 return -EFAULT;
6340
6341 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6342 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6343 sctp_style(sk, UDP))
6344 return -EINVAL;
6345
6346 if (asoc) {
6347 info.snd_sid = asoc->default_stream;
6348 info.snd_flags = asoc->default_flags;
6349 info.snd_ppid = asoc->default_ppid;
6350 info.snd_context = asoc->default_context;
6351 } else {
6352 info.snd_sid = sp->default_stream;
6353 info.snd_flags = sp->default_flags;
6354 info.snd_ppid = sp->default_ppid;
6355 info.snd_context = sp->default_context;
6356 }
6357
6358 if (put_user(len, optlen))
6359 return -EFAULT;
6360 if (copy_to_user(optval, &info, len))
6361 return -EFAULT;
6362
6363 return 0;
6364}
6365
6366/*
6367 *
6368 * 7.1.5 SCTP_NODELAY
6369 *
6370 * Turn on/off any Nagle-like algorithm. This means that packets are
6371 * generally sent as soon as possible and no unnecessary delays are
6372 * introduced, at the cost of more packets in the network. Expects an
6373 * integer boolean flag.
6374 */
6375
6376static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6377 char __user *optval, int __user *optlen)
6378{
6379 int val;
6380
6381 if (len < sizeof(int))
6382 return -EINVAL;
6383
6384 len = sizeof(int);
6385 val = (sctp_sk(sk)->nodelay == 1);
6386 if (put_user(len, optlen))
6387 return -EFAULT;
6388 if (copy_to_user(optval, &val, len))
6389 return -EFAULT;
6390 return 0;
6391}
6392
6393/*
6394 *
6395 * 7.1.1 SCTP_RTOINFO
6396 *
6397 * The protocol parameters used to initialize and bound retransmission
6398 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6399 * and modify these parameters.
6400 * All parameters are time values, in milliseconds. A value of 0, when
6401 * modifying the parameters, indicates that the current value should not
6402 * be changed.
6403 *
6404 */
6405static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6406 char __user *optval,
6407 int __user *optlen) {
6408 struct sctp_rtoinfo rtoinfo;
6409 struct sctp_association *asoc;
6410
6411 if (len < sizeof (struct sctp_rtoinfo))
6412 return -EINVAL;
6413
6414 len = sizeof(struct sctp_rtoinfo);
6415
6416 if (copy_from_user(&rtoinfo, optval, len))
6417 return -EFAULT;
6418
6419 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6420
6421 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6422 sctp_style(sk, UDP))
6423 return -EINVAL;
6424
6425 /* Values corresponding to the specific association. */
6426 if (asoc) {
6427 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6428 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6429 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6430 } else {
6431 /* Values corresponding to the endpoint. */
6432 struct sctp_sock *sp = sctp_sk(sk);
6433
6434 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6435 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6436 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6437 }
6438
6439 if (put_user(len, optlen))
6440 return -EFAULT;
6441
6442 if (copy_to_user(optval, &rtoinfo, len))
6443 return -EFAULT;
6444
6445 return 0;
6446}
6447
6448/*
6449 *
6450 * 7.1.2 SCTP_ASSOCINFO
6451 *
6452 * This option is used to tune the maximum retransmission attempts
6453 * of the association.
6454 * Returns an error if the new association retransmission value is
6455 * greater than the sum of the retransmission value of the peer.
6456 * See [SCTP] for more information.
6457 *
6458 */
6459static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6460 char __user *optval,
6461 int __user *optlen)
6462{
6463
6464 struct sctp_assocparams assocparams;
6465 struct sctp_association *asoc;
6466 struct list_head *pos;
6467 int cnt = 0;
6468
6469 if (len < sizeof (struct sctp_assocparams))
6470 return -EINVAL;
6471
6472 len = sizeof(struct sctp_assocparams);
6473
6474 if (copy_from_user(&assocparams, optval, len))
6475 return -EFAULT;
6476
6477 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6478
6479 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6480 sctp_style(sk, UDP))
6481 return -EINVAL;
6482
6483 /* Values correspoinding to the specific association */
6484 if (asoc) {
6485 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6486 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6487 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6488 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6489
6490 list_for_each(pos, &asoc->peer.transport_addr_list) {
6491 cnt++;
6492 }
6493
6494 assocparams.sasoc_number_peer_destinations = cnt;
6495 } else {
6496 /* Values corresponding to the endpoint */
6497 struct sctp_sock *sp = sctp_sk(sk);
6498
6499 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6500 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6501 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6502 assocparams.sasoc_cookie_life =
6503 sp->assocparams.sasoc_cookie_life;
6504 assocparams.sasoc_number_peer_destinations =
6505 sp->assocparams.
6506 sasoc_number_peer_destinations;
6507 }
6508
6509 if (put_user(len, optlen))
6510 return -EFAULT;
6511
6512 if (copy_to_user(optval, &assocparams, len))
6513 return -EFAULT;
6514
6515 return 0;
6516}
6517
6518/*
6519 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6520 *
6521 * This socket option is a boolean flag which turns on or off mapped V4
6522 * addresses. If this option is turned on and the socket is type
6523 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6524 * If this option is turned off, then no mapping will be done of V4
6525 * addresses and a user will receive both PF_INET6 and PF_INET type
6526 * addresses on the socket.
6527 */
6528static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6529 char __user *optval, int __user *optlen)
6530{
6531 int val;
6532 struct sctp_sock *sp = sctp_sk(sk);
6533
6534 if (len < sizeof(int))
6535 return -EINVAL;
6536
6537 len = sizeof(int);
6538 val = sp->v4mapped;
6539 if (put_user(len, optlen))
6540 return -EFAULT;
6541 if (copy_to_user(optval, &val, len))
6542 return -EFAULT;
6543
6544 return 0;
6545}
6546
6547/*
6548 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6549 * (chapter and verse is quoted at sctp_setsockopt_context())
6550 */
6551static int sctp_getsockopt_context(struct sock *sk, int len,
6552 char __user *optval, int __user *optlen)
6553{
6554 struct sctp_assoc_value params;
6555 struct sctp_association *asoc;
6556
6557 if (len < sizeof(struct sctp_assoc_value))
6558 return -EINVAL;
6559
6560 len = sizeof(struct sctp_assoc_value);
6561
6562 if (copy_from_user(¶ms, optval, len))
6563 return -EFAULT;
6564
6565 asoc = sctp_id2assoc(sk, params.assoc_id);
6566 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6567 sctp_style(sk, UDP))
6568 return -EINVAL;
6569
6570 params.assoc_value = asoc ? asoc->default_rcv_context
6571 : sctp_sk(sk)->default_rcv_context;
6572
6573 if (put_user(len, optlen))
6574 return -EFAULT;
6575 if (copy_to_user(optval, ¶ms, len))
6576 return -EFAULT;
6577
6578 return 0;
6579}
6580
6581/*
6582 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6583 * This option will get or set the maximum size to put in any outgoing
6584 * SCTP DATA chunk. If a message is larger than this size it will be
6585 * fragmented by SCTP into the specified size. Note that the underlying
6586 * SCTP implementation may fragment into smaller sized chunks when the
6587 * PMTU of the underlying association is smaller than the value set by
6588 * the user. The default value for this option is '0' which indicates
6589 * the user is NOT limiting fragmentation and only the PMTU will effect
6590 * SCTP's choice of DATA chunk size. Note also that values set larger
6591 * than the maximum size of an IP datagram will effectively let SCTP
6592 * control fragmentation (i.e. the same as setting this option to 0).
6593 *
6594 * The following structure is used to access and modify this parameter:
6595 *
6596 * struct sctp_assoc_value {
6597 * sctp_assoc_t assoc_id;
6598 * uint32_t assoc_value;
6599 * };
6600 *
6601 * assoc_id: This parameter is ignored for one-to-one style sockets.
6602 * For one-to-many style sockets this parameter indicates which
6603 * association the user is performing an action upon. Note that if
6604 * this field's value is zero then the endpoints default value is
6605 * changed (effecting future associations only).
6606 * assoc_value: This parameter specifies the maximum size in bytes.
6607 */
6608static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6609 char __user *optval, int __user *optlen)
6610{
6611 struct sctp_assoc_value params;
6612 struct sctp_association *asoc;
6613
6614 if (len == sizeof(int)) {
6615 pr_warn_ratelimited(DEPRECATED
6616 "%s (pid %d) "
6617 "Use of int in maxseg socket option.\n"
6618 "Use struct sctp_assoc_value instead\n",
6619 current->comm, task_pid_nr(current));
6620 params.assoc_id = SCTP_FUTURE_ASSOC;
6621 } else if (len >= sizeof(struct sctp_assoc_value)) {
6622 len = sizeof(struct sctp_assoc_value);
6623 if (copy_from_user(¶ms, optval, len))
6624 return -EFAULT;
6625 } else
6626 return -EINVAL;
6627
6628 asoc = sctp_id2assoc(sk, params.assoc_id);
6629 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6630 sctp_style(sk, UDP))
6631 return -EINVAL;
6632
6633 if (asoc)
6634 params.assoc_value = asoc->frag_point;
6635 else
6636 params.assoc_value = sctp_sk(sk)->user_frag;
6637
6638 if (put_user(len, optlen))
6639 return -EFAULT;
6640 if (len == sizeof(int)) {
6641 if (copy_to_user(optval, ¶ms.assoc_value, len))
6642 return -EFAULT;
6643 } else {
6644 if (copy_to_user(optval, ¶ms, len))
6645 return -EFAULT;
6646 }
6647
6648 return 0;
6649}
6650
6651/*
6652 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6653 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6654 */
6655static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6656 char __user *optval, int __user *optlen)
6657{
6658 int val;
6659
6660 if (len < sizeof(int))
6661 return -EINVAL;
6662
6663 len = sizeof(int);
6664
6665 val = sctp_sk(sk)->frag_interleave;
6666 if (put_user(len, optlen))
6667 return -EFAULT;
6668 if (copy_to_user(optval, &val, len))
6669 return -EFAULT;
6670
6671 return 0;
6672}
6673
6674/*
6675 * 7.1.25. Set or Get the sctp partial delivery point
6676 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6677 */
6678static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6679 char __user *optval,
6680 int __user *optlen)
6681{
6682 u32 val;
6683
6684 if (len < sizeof(u32))
6685 return -EINVAL;
6686
6687 len = sizeof(u32);
6688
6689 val = sctp_sk(sk)->pd_point;
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 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6700 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6701 */
6702static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6703 char __user *optval,
6704 int __user *optlen)
6705{
6706 struct sctp_assoc_value params;
6707 struct sctp_association *asoc;
6708
6709 if (len == sizeof(int)) {
6710 pr_warn_ratelimited(DEPRECATED
6711 "%s (pid %d) "
6712 "Use of int in max_burst socket option.\n"
6713 "Use struct sctp_assoc_value instead\n",
6714 current->comm, task_pid_nr(current));
6715 params.assoc_id = SCTP_FUTURE_ASSOC;
6716 } else if (len >= sizeof(struct sctp_assoc_value)) {
6717 len = sizeof(struct sctp_assoc_value);
6718 if (copy_from_user(¶ms, optval, len))
6719 return -EFAULT;
6720 } else
6721 return -EINVAL;
6722
6723 asoc = sctp_id2assoc(sk, params.assoc_id);
6724 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6725 sctp_style(sk, UDP))
6726 return -EINVAL;
6727
6728 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6729
6730 if (len == sizeof(int)) {
6731 if (copy_to_user(optval, ¶ms.assoc_value, len))
6732 return -EFAULT;
6733 } else {
6734 if (copy_to_user(optval, ¶ms, len))
6735 return -EFAULT;
6736 }
6737
6738 return 0;
6739
6740}
6741
6742static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6743 char __user *optval, int __user *optlen)
6744{
6745 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6746 struct sctp_hmacalgo __user *p = (void __user *)optval;
6747 struct sctp_hmac_algo_param *hmacs;
6748 __u16 data_len = 0;
6749 u32 num_idents;
6750 int i;
6751
6752 if (!ep->auth_enable)
6753 return -EACCES;
6754
6755 hmacs = ep->auth_hmacs_list;
6756 data_len = ntohs(hmacs->param_hdr.length) -
6757 sizeof(struct sctp_paramhdr);
6758
6759 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6760 return -EINVAL;
6761
6762 len = sizeof(struct sctp_hmacalgo) + data_len;
6763 num_idents = data_len / sizeof(u16);
6764
6765 if (put_user(len, optlen))
6766 return -EFAULT;
6767 if (put_user(num_idents, &p->shmac_num_idents))
6768 return -EFAULT;
6769 for (i = 0; i < num_idents; i++) {
6770 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6771
6772 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6773 return -EFAULT;
6774 }
6775 return 0;
6776}
6777
6778static int sctp_getsockopt_active_key(struct sock *sk, int len,
6779 char __user *optval, int __user *optlen)
6780{
6781 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6782 struct sctp_authkeyid val;
6783 struct sctp_association *asoc;
6784
6785 if (len < sizeof(struct sctp_authkeyid))
6786 return -EINVAL;
6787
6788 len = sizeof(struct sctp_authkeyid);
6789 if (copy_from_user(&val, optval, len))
6790 return -EFAULT;
6791
6792 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6793 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6794 return -EINVAL;
6795
6796 if (asoc) {
6797 if (!asoc->peer.auth_capable)
6798 return -EACCES;
6799 val.scact_keynumber = asoc->active_key_id;
6800 } else {
6801 if (!ep->auth_enable)
6802 return -EACCES;
6803 val.scact_keynumber = ep->active_key_id;
6804 }
6805
6806 if (put_user(len, optlen))
6807 return -EFAULT;
6808 if (copy_to_user(optval, &val, len))
6809 return -EFAULT;
6810
6811 return 0;
6812}
6813
6814static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6815 char __user *optval, int __user *optlen)
6816{
6817 struct sctp_authchunks __user *p = (void __user *)optval;
6818 struct sctp_authchunks val;
6819 struct sctp_association *asoc;
6820 struct sctp_chunks_param *ch;
6821 u32 num_chunks = 0;
6822 char __user *to;
6823
6824 if (len < sizeof(struct sctp_authchunks))
6825 return -EINVAL;
6826
6827 if (copy_from_user(&val, optval, sizeof(val)))
6828 return -EFAULT;
6829
6830 to = p->gauth_chunks;
6831 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6832 if (!asoc)
6833 return -EINVAL;
6834
6835 if (!asoc->peer.auth_capable)
6836 return -EACCES;
6837
6838 ch = asoc->peer.peer_chunks;
6839 if (!ch)
6840 goto num;
6841
6842 /* See if the user provided enough room for all the data */
6843 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6844 if (len < num_chunks)
6845 return -EINVAL;
6846
6847 if (copy_to_user(to, ch->chunks, num_chunks))
6848 return -EFAULT;
6849num:
6850 len = sizeof(struct sctp_authchunks) + num_chunks;
6851 if (put_user(len, optlen))
6852 return -EFAULT;
6853 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6854 return -EFAULT;
6855 return 0;
6856}
6857
6858static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6859 char __user *optval, int __user *optlen)
6860{
6861 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6862 struct sctp_authchunks __user *p = (void __user *)optval;
6863 struct sctp_authchunks val;
6864 struct sctp_association *asoc;
6865 struct sctp_chunks_param *ch;
6866 u32 num_chunks = 0;
6867 char __user *to;
6868
6869 if (len < sizeof(struct sctp_authchunks))
6870 return -EINVAL;
6871
6872 if (copy_from_user(&val, optval, sizeof(val)))
6873 return -EFAULT;
6874
6875 to = p->gauth_chunks;
6876 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6877 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6878 sctp_style(sk, UDP))
6879 return -EINVAL;
6880
6881 if (asoc) {
6882 if (!asoc->peer.auth_capable)
6883 return -EACCES;
6884 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6885 } else {
6886 if (!ep->auth_enable)
6887 return -EACCES;
6888 ch = ep->auth_chunk_list;
6889 }
6890 if (!ch)
6891 goto num;
6892
6893 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6894 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6895 return -EINVAL;
6896
6897 if (copy_to_user(to, ch->chunks, num_chunks))
6898 return -EFAULT;
6899num:
6900 len = sizeof(struct sctp_authchunks) + num_chunks;
6901 if (put_user(len, optlen))
6902 return -EFAULT;
6903 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6904 return -EFAULT;
6905
6906 return 0;
6907}
6908
6909/*
6910 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6911 * This option gets the current number of associations that are attached
6912 * to a one-to-many style socket. The option value is an uint32_t.
6913 */
6914static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6915 char __user *optval, int __user *optlen)
6916{
6917 struct sctp_sock *sp = sctp_sk(sk);
6918 struct sctp_association *asoc;
6919 u32 val = 0;
6920
6921 if (sctp_style(sk, TCP))
6922 return -EOPNOTSUPP;
6923
6924 if (len < sizeof(u32))
6925 return -EINVAL;
6926
6927 len = sizeof(u32);
6928
6929 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6930 val++;
6931 }
6932
6933 if (put_user(len, optlen))
6934 return -EFAULT;
6935 if (copy_to_user(optval, &val, len))
6936 return -EFAULT;
6937
6938 return 0;
6939}
6940
6941/*
6942 * 8.1.23 SCTP_AUTO_ASCONF
6943 * See the corresponding setsockopt entry as description
6944 */
6945static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6946 char __user *optval, int __user *optlen)
6947{
6948 int val = 0;
6949
6950 if (len < sizeof(int))
6951 return -EINVAL;
6952
6953 len = sizeof(int);
6954 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6955 val = 1;
6956 if (put_user(len, optlen))
6957 return -EFAULT;
6958 if (copy_to_user(optval, &val, len))
6959 return -EFAULT;
6960 return 0;
6961}
6962
6963/*
6964 * 8.2.6. Get the Current Identifiers of Associations
6965 * (SCTP_GET_ASSOC_ID_LIST)
6966 *
6967 * This option gets the current list of SCTP association identifiers of
6968 * the SCTP associations handled by a one-to-many style socket.
6969 */
6970static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6971 char __user *optval, int __user *optlen)
6972{
6973 struct sctp_sock *sp = sctp_sk(sk);
6974 struct sctp_association *asoc;
6975 struct sctp_assoc_ids *ids;
6976 u32 num = 0;
6977
6978 if (sctp_style(sk, TCP))
6979 return -EOPNOTSUPP;
6980
6981 if (len < sizeof(struct sctp_assoc_ids))
6982 return -EINVAL;
6983
6984 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6985 num++;
6986 }
6987
6988 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6989 return -EINVAL;
6990
6991 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6992
6993 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6994 if (unlikely(!ids))
6995 return -ENOMEM;
6996
6997 ids->gaids_number_of_ids = num;
6998 num = 0;
6999 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7000 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7001 }
7002
7003 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7004 kfree(ids);
7005 return -EFAULT;
7006 }
7007
7008 kfree(ids);
7009 return 0;
7010}
7011
7012/*
7013 * SCTP_PEER_ADDR_THLDS
7014 *
7015 * This option allows us to fetch the partially failed threshold for one or all
7016 * transports in an association. See Section 6.1 of:
7017 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7018 */
7019static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7020 char __user *optval, int len,
7021 int __user *optlen, bool v2)
7022{
7023 struct sctp_paddrthlds_v2 val;
7024 struct sctp_transport *trans;
7025 struct sctp_association *asoc;
7026 int min;
7027
7028 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7029 if (len < min)
7030 return -EINVAL;
7031 len = min;
7032 if (copy_from_user(&val, optval, len))
7033 return -EFAULT;
7034
7035 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7036 trans = sctp_addr_id2transport(sk, &val.spt_address,
7037 val.spt_assoc_id);
7038 if (!trans)
7039 return -ENOENT;
7040
7041 val.spt_pathmaxrxt = trans->pathmaxrxt;
7042 val.spt_pathpfthld = trans->pf_retrans;
7043 val.spt_pathcpthld = trans->ps_retrans;
7044
7045 goto out;
7046 }
7047
7048 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7049 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7050 sctp_style(sk, UDP))
7051 return -EINVAL;
7052
7053 if (asoc) {
7054 val.spt_pathpfthld = asoc->pf_retrans;
7055 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7056 val.spt_pathcpthld = asoc->ps_retrans;
7057 } else {
7058 struct sctp_sock *sp = sctp_sk(sk);
7059
7060 val.spt_pathpfthld = sp->pf_retrans;
7061 val.spt_pathmaxrxt = sp->pathmaxrxt;
7062 val.spt_pathcpthld = sp->ps_retrans;
7063 }
7064
7065out:
7066 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7067 return -EFAULT;
7068
7069 return 0;
7070}
7071
7072/*
7073 * SCTP_GET_ASSOC_STATS
7074 *
7075 * This option retrieves local per endpoint statistics. It is modeled
7076 * after OpenSolaris' implementation
7077 */
7078static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7079 char __user *optval,
7080 int __user *optlen)
7081{
7082 struct sctp_assoc_stats sas;
7083 struct sctp_association *asoc = NULL;
7084
7085 /* User must provide at least the assoc id */
7086 if (len < sizeof(sctp_assoc_t))
7087 return -EINVAL;
7088
7089 /* Allow the struct to grow and fill in as much as possible */
7090 len = min_t(size_t, len, sizeof(sas));
7091
7092 if (copy_from_user(&sas, optval, len))
7093 return -EFAULT;
7094
7095 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7096 if (!asoc)
7097 return -EINVAL;
7098
7099 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7100 sas.sas_gapcnt = asoc->stats.gapcnt;
7101 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7102 sas.sas_osacks = asoc->stats.osacks;
7103 sas.sas_isacks = asoc->stats.isacks;
7104 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7105 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7106 sas.sas_oodchunks = asoc->stats.oodchunks;
7107 sas.sas_iodchunks = asoc->stats.iodchunks;
7108 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7109 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7110 sas.sas_idupchunks = asoc->stats.idupchunks;
7111 sas.sas_opackets = asoc->stats.opackets;
7112 sas.sas_ipackets = asoc->stats.ipackets;
7113
7114 /* New high max rto observed, will return 0 if not a single
7115 * RTO update took place. obs_rto_ipaddr will be bogus
7116 * in such a case
7117 */
7118 sas.sas_maxrto = asoc->stats.max_obs_rto;
7119 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7120 sizeof(struct sockaddr_storage));
7121
7122 /* Mark beginning of a new observation period */
7123 asoc->stats.max_obs_rto = asoc->rto_min;
7124
7125 if (put_user(len, optlen))
7126 return -EFAULT;
7127
7128 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7129
7130 if (copy_to_user(optval, &sas, len))
7131 return -EFAULT;
7132
7133 return 0;
7134}
7135
7136static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7137 char __user *optval,
7138 int __user *optlen)
7139{
7140 int val = 0;
7141
7142 if (len < sizeof(int))
7143 return -EINVAL;
7144
7145 len = sizeof(int);
7146 if (sctp_sk(sk)->recvrcvinfo)
7147 val = 1;
7148 if (put_user(len, optlen))
7149 return -EFAULT;
7150 if (copy_to_user(optval, &val, len))
7151 return -EFAULT;
7152
7153 return 0;
7154}
7155
7156static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7157 char __user *optval,
7158 int __user *optlen)
7159{
7160 int val = 0;
7161
7162 if (len < sizeof(int))
7163 return -EINVAL;
7164
7165 len = sizeof(int);
7166 if (sctp_sk(sk)->recvnxtinfo)
7167 val = 1;
7168 if (put_user(len, optlen))
7169 return -EFAULT;
7170 if (copy_to_user(optval, &val, len))
7171 return -EFAULT;
7172
7173 return 0;
7174}
7175
7176static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7177 char __user *optval,
7178 int __user *optlen)
7179{
7180 struct sctp_assoc_value params;
7181 struct sctp_association *asoc;
7182 int retval = -EFAULT;
7183
7184 if (len < sizeof(params)) {
7185 retval = -EINVAL;
7186 goto out;
7187 }
7188
7189 len = sizeof(params);
7190 if (copy_from_user(¶ms, optval, len))
7191 goto out;
7192
7193 asoc = sctp_id2assoc(sk, params.assoc_id);
7194 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7195 sctp_style(sk, UDP)) {
7196 retval = -EINVAL;
7197 goto out;
7198 }
7199
7200 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7201 : sctp_sk(sk)->ep->prsctp_enable;
7202
7203 if (put_user(len, optlen))
7204 goto out;
7205
7206 if (copy_to_user(optval, ¶ms, len))
7207 goto out;
7208
7209 retval = 0;
7210
7211out:
7212 return retval;
7213}
7214
7215static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7216 char __user *optval,
7217 int __user *optlen)
7218{
7219 struct sctp_default_prinfo info;
7220 struct sctp_association *asoc;
7221 int retval = -EFAULT;
7222
7223 if (len < sizeof(info)) {
7224 retval = -EINVAL;
7225 goto out;
7226 }
7227
7228 len = sizeof(info);
7229 if (copy_from_user(&info, optval, len))
7230 goto out;
7231
7232 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7233 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7234 sctp_style(sk, UDP)) {
7235 retval = -EINVAL;
7236 goto out;
7237 }
7238
7239 if (asoc) {
7240 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7241 info.pr_value = asoc->default_timetolive;
7242 } else {
7243 struct sctp_sock *sp = sctp_sk(sk);
7244
7245 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7246 info.pr_value = sp->default_timetolive;
7247 }
7248
7249 if (put_user(len, optlen))
7250 goto out;
7251
7252 if (copy_to_user(optval, &info, len))
7253 goto out;
7254
7255 retval = 0;
7256
7257out:
7258 return retval;
7259}
7260
7261static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7262 char __user *optval,
7263 int __user *optlen)
7264{
7265 struct sctp_prstatus params;
7266 struct sctp_association *asoc;
7267 int policy;
7268 int retval = -EINVAL;
7269
7270 if (len < sizeof(params))
7271 goto out;
7272
7273 len = sizeof(params);
7274 if (copy_from_user(¶ms, optval, len)) {
7275 retval = -EFAULT;
7276 goto out;
7277 }
7278
7279 policy = params.sprstat_policy;
7280 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7281 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7282 goto out;
7283
7284 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7285 if (!asoc)
7286 goto out;
7287
7288 if (policy == SCTP_PR_SCTP_ALL) {
7289 params.sprstat_abandoned_unsent = 0;
7290 params.sprstat_abandoned_sent = 0;
7291 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7292 params.sprstat_abandoned_unsent +=
7293 asoc->abandoned_unsent[policy];
7294 params.sprstat_abandoned_sent +=
7295 asoc->abandoned_sent[policy];
7296 }
7297 } else {
7298 params.sprstat_abandoned_unsent =
7299 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7300 params.sprstat_abandoned_sent =
7301 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7302 }
7303
7304 if (put_user(len, optlen)) {
7305 retval = -EFAULT;
7306 goto out;
7307 }
7308
7309 if (copy_to_user(optval, ¶ms, len)) {
7310 retval = -EFAULT;
7311 goto out;
7312 }
7313
7314 retval = 0;
7315
7316out:
7317 return retval;
7318}
7319
7320static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7321 char __user *optval,
7322 int __user *optlen)
7323{
7324 struct sctp_stream_out_ext *streamoute;
7325 struct sctp_association *asoc;
7326 struct sctp_prstatus params;
7327 int retval = -EINVAL;
7328 int policy;
7329
7330 if (len < sizeof(params))
7331 goto out;
7332
7333 len = sizeof(params);
7334 if (copy_from_user(¶ms, optval, len)) {
7335 retval = -EFAULT;
7336 goto out;
7337 }
7338
7339 policy = params.sprstat_policy;
7340 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7341 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7342 goto out;
7343
7344 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7345 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7346 goto out;
7347
7348 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7349 if (!streamoute) {
7350 /* Not allocated yet, means all stats are 0 */
7351 params.sprstat_abandoned_unsent = 0;
7352 params.sprstat_abandoned_sent = 0;
7353 retval = 0;
7354 goto out;
7355 }
7356
7357 if (policy == SCTP_PR_SCTP_ALL) {
7358 params.sprstat_abandoned_unsent = 0;
7359 params.sprstat_abandoned_sent = 0;
7360 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7361 params.sprstat_abandoned_unsent +=
7362 streamoute->abandoned_unsent[policy];
7363 params.sprstat_abandoned_sent +=
7364 streamoute->abandoned_sent[policy];
7365 }
7366 } else {
7367 params.sprstat_abandoned_unsent =
7368 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7369 params.sprstat_abandoned_sent =
7370 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7371 }
7372
7373 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7374 retval = -EFAULT;
7375 goto out;
7376 }
7377
7378 retval = 0;
7379
7380out:
7381 return retval;
7382}
7383
7384static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7385 char __user *optval,
7386 int __user *optlen)
7387{
7388 struct sctp_assoc_value params;
7389 struct sctp_association *asoc;
7390 int retval = -EFAULT;
7391
7392 if (len < sizeof(params)) {
7393 retval = -EINVAL;
7394 goto out;
7395 }
7396
7397 len = sizeof(params);
7398 if (copy_from_user(¶ms, optval, len))
7399 goto out;
7400
7401 asoc = sctp_id2assoc(sk, params.assoc_id);
7402 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7403 sctp_style(sk, UDP)) {
7404 retval = -EINVAL;
7405 goto out;
7406 }
7407
7408 params.assoc_value = asoc ? asoc->peer.reconf_capable
7409 : sctp_sk(sk)->ep->reconf_enable;
7410
7411 if (put_user(len, optlen))
7412 goto out;
7413
7414 if (copy_to_user(optval, ¶ms, len))
7415 goto out;
7416
7417 retval = 0;
7418
7419out:
7420 return retval;
7421}
7422
7423static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7424 char __user *optval,
7425 int __user *optlen)
7426{
7427 struct sctp_assoc_value params;
7428 struct sctp_association *asoc;
7429 int retval = -EFAULT;
7430
7431 if (len < sizeof(params)) {
7432 retval = -EINVAL;
7433 goto out;
7434 }
7435
7436 len = sizeof(params);
7437 if (copy_from_user(¶ms, optval, len))
7438 goto out;
7439
7440 asoc = sctp_id2assoc(sk, params.assoc_id);
7441 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7442 sctp_style(sk, UDP)) {
7443 retval = -EINVAL;
7444 goto out;
7445 }
7446
7447 params.assoc_value = asoc ? asoc->strreset_enable
7448 : sctp_sk(sk)->ep->strreset_enable;
7449
7450 if (put_user(len, optlen))
7451 goto out;
7452
7453 if (copy_to_user(optval, ¶ms, len))
7454 goto out;
7455
7456 retval = 0;
7457
7458out:
7459 return retval;
7460}
7461
7462static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7463 char __user *optval,
7464 int __user *optlen)
7465{
7466 struct sctp_assoc_value params;
7467 struct sctp_association *asoc;
7468 int retval = -EFAULT;
7469
7470 if (len < sizeof(params)) {
7471 retval = -EINVAL;
7472 goto out;
7473 }
7474
7475 len = sizeof(params);
7476 if (copy_from_user(¶ms, optval, len))
7477 goto out;
7478
7479 asoc = sctp_id2assoc(sk, params.assoc_id);
7480 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7481 sctp_style(sk, UDP)) {
7482 retval = -EINVAL;
7483 goto out;
7484 }
7485
7486 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7487 : sctp_sk(sk)->default_ss;
7488
7489 if (put_user(len, optlen))
7490 goto out;
7491
7492 if (copy_to_user(optval, ¶ms, len))
7493 goto out;
7494
7495 retval = 0;
7496
7497out:
7498 return retval;
7499}
7500
7501static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7502 char __user *optval,
7503 int __user *optlen)
7504{
7505 struct sctp_stream_value params;
7506 struct sctp_association *asoc;
7507 int retval = -EFAULT;
7508
7509 if (len < sizeof(params)) {
7510 retval = -EINVAL;
7511 goto out;
7512 }
7513
7514 len = sizeof(params);
7515 if (copy_from_user(¶ms, optval, len))
7516 goto out;
7517
7518 asoc = sctp_id2assoc(sk, params.assoc_id);
7519 if (!asoc) {
7520 retval = -EINVAL;
7521 goto out;
7522 }
7523
7524 retval = sctp_sched_get_value(asoc, params.stream_id,
7525 ¶ms.stream_value);
7526 if (retval)
7527 goto out;
7528
7529 if (put_user(len, optlen)) {
7530 retval = -EFAULT;
7531 goto out;
7532 }
7533
7534 if (copy_to_user(optval, ¶ms, len)) {
7535 retval = -EFAULT;
7536 goto out;
7537 }
7538
7539out:
7540 return retval;
7541}
7542
7543static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7544 char __user *optval,
7545 int __user *optlen)
7546{
7547 struct sctp_assoc_value params;
7548 struct sctp_association *asoc;
7549 int retval = -EFAULT;
7550
7551 if (len < sizeof(params)) {
7552 retval = -EINVAL;
7553 goto out;
7554 }
7555
7556 len = sizeof(params);
7557 if (copy_from_user(¶ms, optval, len))
7558 goto out;
7559
7560 asoc = sctp_id2assoc(sk, params.assoc_id);
7561 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7562 sctp_style(sk, UDP)) {
7563 retval = -EINVAL;
7564 goto out;
7565 }
7566
7567 params.assoc_value = asoc ? asoc->peer.intl_capable
7568 : sctp_sk(sk)->ep->intl_enable;
7569
7570 if (put_user(len, optlen))
7571 goto out;
7572
7573 if (copy_to_user(optval, ¶ms, len))
7574 goto out;
7575
7576 retval = 0;
7577
7578out:
7579 return retval;
7580}
7581
7582static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7583 char __user *optval,
7584 int __user *optlen)
7585{
7586 int val;
7587
7588 if (len < sizeof(int))
7589 return -EINVAL;
7590
7591 len = sizeof(int);
7592 val = sctp_sk(sk)->reuse;
7593 if (put_user(len, optlen))
7594 return -EFAULT;
7595
7596 if (copy_to_user(optval, &val, len))
7597 return -EFAULT;
7598
7599 return 0;
7600}
7601
7602static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7603 int __user *optlen)
7604{
7605 struct sctp_association *asoc;
7606 struct sctp_event param;
7607 __u16 subscribe;
7608
7609 if (len < sizeof(param))
7610 return -EINVAL;
7611
7612 len = sizeof(param);
7613 if (copy_from_user(¶m, optval, len))
7614 return -EFAULT;
7615
7616 if (param.se_type < SCTP_SN_TYPE_BASE ||
7617 param.se_type > SCTP_SN_TYPE_MAX)
7618 return -EINVAL;
7619
7620 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7621 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7622 sctp_style(sk, UDP))
7623 return -EINVAL;
7624
7625 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7626 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7627
7628 if (put_user(len, optlen))
7629 return -EFAULT;
7630
7631 if (copy_to_user(optval, ¶m, len))
7632 return -EFAULT;
7633
7634 return 0;
7635}
7636
7637static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7638 char __user *optval,
7639 int __user *optlen)
7640{
7641 struct sctp_assoc_value params;
7642 struct sctp_association *asoc;
7643 int retval = -EFAULT;
7644
7645 if (len < sizeof(params)) {
7646 retval = -EINVAL;
7647 goto out;
7648 }
7649
7650 len = sizeof(params);
7651 if (copy_from_user(¶ms, optval, len))
7652 goto out;
7653
7654 asoc = sctp_id2assoc(sk, params.assoc_id);
7655 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7656 sctp_style(sk, UDP)) {
7657 retval = -EINVAL;
7658 goto out;
7659 }
7660
7661 params.assoc_value = asoc ? asoc->peer.asconf_capable
7662 : sctp_sk(sk)->ep->asconf_enable;
7663
7664 if (put_user(len, optlen))
7665 goto out;
7666
7667 if (copy_to_user(optval, ¶ms, len))
7668 goto out;
7669
7670 retval = 0;
7671
7672out:
7673 return retval;
7674}
7675
7676static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7677 char __user *optval,
7678 int __user *optlen)
7679{
7680 struct sctp_assoc_value params;
7681 struct sctp_association *asoc;
7682 int retval = -EFAULT;
7683
7684 if (len < sizeof(params)) {
7685 retval = -EINVAL;
7686 goto out;
7687 }
7688
7689 len = sizeof(params);
7690 if (copy_from_user(¶ms, optval, len))
7691 goto out;
7692
7693 asoc = sctp_id2assoc(sk, params.assoc_id);
7694 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7695 sctp_style(sk, UDP)) {
7696 retval = -EINVAL;
7697 goto out;
7698 }
7699
7700 params.assoc_value = asoc ? asoc->peer.auth_capable
7701 : sctp_sk(sk)->ep->auth_enable;
7702
7703 if (put_user(len, optlen))
7704 goto out;
7705
7706 if (copy_to_user(optval, ¶ms, len))
7707 goto out;
7708
7709 retval = 0;
7710
7711out:
7712 return retval;
7713}
7714
7715static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7716 char __user *optval,
7717 int __user *optlen)
7718{
7719 struct sctp_assoc_value params;
7720 struct sctp_association *asoc;
7721 int retval = -EFAULT;
7722
7723 if (len < sizeof(params)) {
7724 retval = -EINVAL;
7725 goto out;
7726 }
7727
7728 len = sizeof(params);
7729 if (copy_from_user(¶ms, optval, len))
7730 goto out;
7731
7732 asoc = sctp_id2assoc(sk, params.assoc_id);
7733 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7734 sctp_style(sk, UDP)) {
7735 retval = -EINVAL;
7736 goto out;
7737 }
7738
7739 params.assoc_value = asoc ? asoc->peer.ecn_capable
7740 : sctp_sk(sk)->ep->ecn_enable;
7741
7742 if (put_user(len, optlen))
7743 goto out;
7744
7745 if (copy_to_user(optval, ¶ms, len))
7746 goto out;
7747
7748 retval = 0;
7749
7750out:
7751 return retval;
7752}
7753
7754static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7755 char __user *optval,
7756 int __user *optlen)
7757{
7758 struct sctp_assoc_value params;
7759 struct sctp_association *asoc;
7760 int retval = -EFAULT;
7761
7762 if (len < sizeof(params)) {
7763 retval = -EINVAL;
7764 goto out;
7765 }
7766
7767 len = sizeof(params);
7768 if (copy_from_user(¶ms, optval, len))
7769 goto out;
7770
7771 asoc = sctp_id2assoc(sk, params.assoc_id);
7772 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7773 sctp_style(sk, UDP)) {
7774 retval = -EINVAL;
7775 goto out;
7776 }
7777
7778 params.assoc_value = asoc ? asoc->pf_expose
7779 : sctp_sk(sk)->pf_expose;
7780
7781 if (put_user(len, optlen))
7782 goto out;
7783
7784 if (copy_to_user(optval, ¶ms, len))
7785 goto out;
7786
7787 retval = 0;
7788
7789out:
7790 return retval;
7791}
7792
7793static int sctp_getsockopt(struct sock *sk, int level, int optname,
7794 char __user *optval, int __user *optlen)
7795{
7796 int retval = 0;
7797 int len;
7798
7799 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7800
7801 /* I can hardly begin to describe how wrong this is. This is
7802 * so broken as to be worse than useless. The API draft
7803 * REALLY is NOT helpful here... I am not convinced that the
7804 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7805 * are at all well-founded.
7806 */
7807 if (level != SOL_SCTP) {
7808 struct sctp_af *af = sctp_sk(sk)->pf->af;
7809
7810 retval = af->getsockopt(sk, level, optname, optval, optlen);
7811 return retval;
7812 }
7813
7814 if (get_user(len, optlen))
7815 return -EFAULT;
7816
7817 if (len < 0)
7818 return -EINVAL;
7819
7820 lock_sock(sk);
7821
7822 switch (optname) {
7823 case SCTP_STATUS:
7824 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7825 break;
7826 case SCTP_DISABLE_FRAGMENTS:
7827 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7828 optlen);
7829 break;
7830 case SCTP_EVENTS:
7831 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7832 break;
7833 case SCTP_AUTOCLOSE:
7834 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7835 break;
7836 case SCTP_SOCKOPT_PEELOFF:
7837 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7838 break;
7839 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7840 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7841 break;
7842 case SCTP_PEER_ADDR_PARAMS:
7843 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7844 optlen);
7845 break;
7846 case SCTP_DELAYED_SACK:
7847 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7848 optlen);
7849 break;
7850 case SCTP_INITMSG:
7851 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7852 break;
7853 case SCTP_GET_PEER_ADDRS:
7854 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7855 optlen);
7856 break;
7857 case SCTP_GET_LOCAL_ADDRS:
7858 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7859 optlen);
7860 break;
7861 case SCTP_SOCKOPT_CONNECTX3:
7862 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7863 break;
7864 case SCTP_DEFAULT_SEND_PARAM:
7865 retval = sctp_getsockopt_default_send_param(sk, len,
7866 optval, optlen);
7867 break;
7868 case SCTP_DEFAULT_SNDINFO:
7869 retval = sctp_getsockopt_default_sndinfo(sk, len,
7870 optval, optlen);
7871 break;
7872 case SCTP_PRIMARY_ADDR:
7873 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7874 break;
7875 case SCTP_NODELAY:
7876 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7877 break;
7878 case SCTP_RTOINFO:
7879 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7880 break;
7881 case SCTP_ASSOCINFO:
7882 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7883 break;
7884 case SCTP_I_WANT_MAPPED_V4_ADDR:
7885 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7886 break;
7887 case SCTP_MAXSEG:
7888 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7889 break;
7890 case SCTP_GET_PEER_ADDR_INFO:
7891 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7892 optlen);
7893 break;
7894 case SCTP_ADAPTATION_LAYER:
7895 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7896 optlen);
7897 break;
7898 case SCTP_CONTEXT:
7899 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7900 break;
7901 case SCTP_FRAGMENT_INTERLEAVE:
7902 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7903 optlen);
7904 break;
7905 case SCTP_PARTIAL_DELIVERY_POINT:
7906 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7907 optlen);
7908 break;
7909 case SCTP_MAX_BURST:
7910 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7911 break;
7912 case SCTP_AUTH_KEY:
7913 case SCTP_AUTH_CHUNK:
7914 case SCTP_AUTH_DELETE_KEY:
7915 case SCTP_AUTH_DEACTIVATE_KEY:
7916 retval = -EOPNOTSUPP;
7917 break;
7918 case SCTP_HMAC_IDENT:
7919 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7920 break;
7921 case SCTP_AUTH_ACTIVE_KEY:
7922 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7923 break;
7924 case SCTP_PEER_AUTH_CHUNKS:
7925 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7926 optlen);
7927 break;
7928 case SCTP_LOCAL_AUTH_CHUNKS:
7929 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7930 optlen);
7931 break;
7932 case SCTP_GET_ASSOC_NUMBER:
7933 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7934 break;
7935 case SCTP_GET_ASSOC_ID_LIST:
7936 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7937 break;
7938 case SCTP_AUTO_ASCONF:
7939 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7940 break;
7941 case SCTP_PEER_ADDR_THLDS:
7942 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
7943 optlen, false);
7944 break;
7945 case SCTP_PEER_ADDR_THLDS_V2:
7946 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
7947 optlen, true);
7948 break;
7949 case SCTP_GET_ASSOC_STATS:
7950 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7951 break;
7952 case SCTP_RECVRCVINFO:
7953 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7954 break;
7955 case SCTP_RECVNXTINFO:
7956 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7957 break;
7958 case SCTP_PR_SUPPORTED:
7959 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7960 break;
7961 case SCTP_DEFAULT_PRINFO:
7962 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7963 optlen);
7964 break;
7965 case SCTP_PR_ASSOC_STATUS:
7966 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7967 optlen);
7968 break;
7969 case SCTP_PR_STREAM_STATUS:
7970 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7971 optlen);
7972 break;
7973 case SCTP_RECONFIG_SUPPORTED:
7974 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7975 optlen);
7976 break;
7977 case SCTP_ENABLE_STREAM_RESET:
7978 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7979 optlen);
7980 break;
7981 case SCTP_STREAM_SCHEDULER:
7982 retval = sctp_getsockopt_scheduler(sk, len, optval,
7983 optlen);
7984 break;
7985 case SCTP_STREAM_SCHEDULER_VALUE:
7986 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7987 optlen);
7988 break;
7989 case SCTP_INTERLEAVING_SUPPORTED:
7990 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7991 optlen);
7992 break;
7993 case SCTP_REUSE_PORT:
7994 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
7995 break;
7996 case SCTP_EVENT:
7997 retval = sctp_getsockopt_event(sk, len, optval, optlen);
7998 break;
7999 case SCTP_ASCONF_SUPPORTED:
8000 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8001 optlen);
8002 break;
8003 case SCTP_AUTH_SUPPORTED:
8004 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8005 optlen);
8006 break;
8007 case SCTP_ECN_SUPPORTED:
8008 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8009 break;
8010 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8011 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8012 break;
8013 default:
8014 retval = -ENOPROTOOPT;
8015 break;
8016 }
8017
8018 release_sock(sk);
8019 return retval;
8020}
8021
8022static int sctp_hash(struct sock *sk)
8023{
8024 /* STUB */
8025 return 0;
8026}
8027
8028static void sctp_unhash(struct sock *sk)
8029{
8030 /* STUB */
8031}
8032
8033/* Check if port is acceptable. Possibly find first available port.
8034 *
8035 * The port hash table (contained in the 'global' SCTP protocol storage
8036 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8037 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8038 * list (the list number is the port number hashed out, so as you
8039 * would expect from a hash function, all the ports in a given list have
8040 * such a number that hashes out to the same list number; you were
8041 * expecting that, right?); so each list has a set of ports, with a
8042 * link to the socket (struct sock) that uses it, the port number and
8043 * a fastreuse flag (FIXME: NPI ipg).
8044 */
8045static struct sctp_bind_bucket *sctp_bucket_create(
8046 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8047
8048static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8049{
8050 struct sctp_sock *sp = sctp_sk(sk);
8051 bool reuse = (sk->sk_reuse || sp->reuse);
8052 struct sctp_bind_hashbucket *head; /* hash list */
8053 struct net *net = sock_net(sk);
8054 kuid_t uid = sock_i_uid(sk);
8055 struct sctp_bind_bucket *pp;
8056 unsigned short snum;
8057 int ret;
8058
8059 snum = ntohs(addr->v4.sin_port);
8060
8061 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8062
8063 if (snum == 0) {
8064 /* Search for an available port. */
8065 int low, high, remaining, index;
8066 unsigned int rover;
8067
8068 inet_get_local_port_range(net, &low, &high);
8069 remaining = (high - low) + 1;
8070 rover = prandom_u32() % remaining + low;
8071
8072 do {
8073 rover++;
8074 if ((rover < low) || (rover > high))
8075 rover = low;
8076 if (inet_is_local_reserved_port(net, rover))
8077 continue;
8078 index = sctp_phashfn(net, rover);
8079 head = &sctp_port_hashtable[index];
8080 spin_lock_bh(&head->lock);
8081 sctp_for_each_hentry(pp, &head->chain)
8082 if ((pp->port == rover) &&
8083 net_eq(net, pp->net))
8084 goto next;
8085 break;
8086 next:
8087 spin_unlock_bh(&head->lock);
8088 cond_resched();
8089 } while (--remaining > 0);
8090
8091 /* Exhausted local port range during search? */
8092 ret = 1;
8093 if (remaining <= 0)
8094 return ret;
8095
8096 /* OK, here is the one we will use. HEAD (the port
8097 * hash table list entry) is non-NULL and we hold it's
8098 * mutex.
8099 */
8100 snum = rover;
8101 } else {
8102 /* We are given an specific port number; we verify
8103 * that it is not being used. If it is used, we will
8104 * exahust the search in the hash list corresponding
8105 * to the port number (snum) - we detect that with the
8106 * port iterator, pp being NULL.
8107 */
8108 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8109 spin_lock_bh(&head->lock);
8110 sctp_for_each_hentry(pp, &head->chain) {
8111 if ((pp->port == snum) && net_eq(pp->net, net))
8112 goto pp_found;
8113 }
8114 }
8115 pp = NULL;
8116 goto pp_not_found;
8117pp_found:
8118 if (!hlist_empty(&pp->owner)) {
8119 /* We had a port hash table hit - there is an
8120 * available port (pp != NULL) and it is being
8121 * used by other socket (pp->owner not empty); that other
8122 * socket is going to be sk2.
8123 */
8124 struct sock *sk2;
8125
8126 pr_debug("%s: found a possible match\n", __func__);
8127
8128 if ((pp->fastreuse && reuse &&
8129 sk->sk_state != SCTP_SS_LISTENING) ||
8130 (pp->fastreuseport && sk->sk_reuseport &&
8131 uid_eq(pp->fastuid, uid)))
8132 goto success;
8133
8134 /* Run through the list of sockets bound to the port
8135 * (pp->port) [via the pointers bind_next and
8136 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8137 * we get the endpoint they describe and run through
8138 * the endpoint's list of IP (v4 or v6) addresses,
8139 * comparing each of the addresses with the address of
8140 * the socket sk. If we find a match, then that means
8141 * that this port/socket (sk) combination are already
8142 * in an endpoint.
8143 */
8144 sk_for_each_bound(sk2, &pp->owner) {
8145 struct sctp_sock *sp2 = sctp_sk(sk2);
8146 struct sctp_endpoint *ep2 = sp2->ep;
8147
8148 if (sk == sk2 ||
8149 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8150 sk2->sk_state != SCTP_SS_LISTENING) ||
8151 (sk->sk_reuseport && sk2->sk_reuseport &&
8152 uid_eq(uid, sock_i_uid(sk2))))
8153 continue;
8154
8155 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8156 addr, sp2, sp)) {
8157 ret = 1;
8158 goto fail_unlock;
8159 }
8160 }
8161
8162 pr_debug("%s: found a match\n", __func__);
8163 }
8164pp_not_found:
8165 /* If there was a hash table miss, create a new port. */
8166 ret = 1;
8167 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8168 goto fail_unlock;
8169
8170 /* In either case (hit or miss), make sure fastreuse is 1 only
8171 * if sk->sk_reuse is too (that is, if the caller requested
8172 * SO_REUSEADDR on this socket -sk-).
8173 */
8174 if (hlist_empty(&pp->owner)) {
8175 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8176 pp->fastreuse = 1;
8177 else
8178 pp->fastreuse = 0;
8179
8180 if (sk->sk_reuseport) {
8181 pp->fastreuseport = 1;
8182 pp->fastuid = uid;
8183 } else {
8184 pp->fastreuseport = 0;
8185 }
8186 } else {
8187 if (pp->fastreuse &&
8188 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8189 pp->fastreuse = 0;
8190
8191 if (pp->fastreuseport &&
8192 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8193 pp->fastreuseport = 0;
8194 }
8195
8196 /* We are set, so fill up all the data in the hash table
8197 * entry, tie the socket list information with the rest of the
8198 * sockets FIXME: Blurry, NPI (ipg).
8199 */
8200success:
8201 if (!sp->bind_hash) {
8202 inet_sk(sk)->inet_num = snum;
8203 sk_add_bind_node(sk, &pp->owner);
8204 sp->bind_hash = pp;
8205 }
8206 ret = 0;
8207
8208fail_unlock:
8209 spin_unlock_bh(&head->lock);
8210 return ret;
8211}
8212
8213/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8214 * port is requested.
8215 */
8216static int sctp_get_port(struct sock *sk, unsigned short snum)
8217{
8218 union sctp_addr addr;
8219 struct sctp_af *af = sctp_sk(sk)->pf->af;
8220
8221 /* Set up a dummy address struct from the sk. */
8222 af->from_sk(&addr, sk);
8223 addr.v4.sin_port = htons(snum);
8224
8225 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8226 return sctp_get_port_local(sk, &addr);
8227}
8228
8229/*
8230 * Move a socket to LISTENING state.
8231 */
8232static int sctp_listen_start(struct sock *sk, int backlog)
8233{
8234 struct sctp_sock *sp = sctp_sk(sk);
8235 struct sctp_endpoint *ep = sp->ep;
8236 struct crypto_shash *tfm = NULL;
8237 char alg[32];
8238
8239 /* Allocate HMAC for generating cookie. */
8240 if (!sp->hmac && sp->sctp_hmac_alg) {
8241 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8242 tfm = crypto_alloc_shash(alg, 0, 0);
8243 if (IS_ERR(tfm)) {
8244 net_info_ratelimited("failed to load transform for %s: %ld\n",
8245 sp->sctp_hmac_alg, PTR_ERR(tfm));
8246 return -ENOSYS;
8247 }
8248 sctp_sk(sk)->hmac = tfm;
8249 }
8250
8251 /*
8252 * If a bind() or sctp_bindx() is not called prior to a listen()
8253 * call that allows new associations to be accepted, the system
8254 * picks an ephemeral port and will choose an address set equivalent
8255 * to binding with a wildcard address.
8256 *
8257 * This is not currently spelled out in the SCTP sockets
8258 * extensions draft, but follows the practice as seen in TCP
8259 * sockets.
8260 *
8261 */
8262 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8263 if (!ep->base.bind_addr.port) {
8264 if (sctp_autobind(sk))
8265 return -EAGAIN;
8266 } else {
8267 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8268 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8269 return -EADDRINUSE;
8270 }
8271 }
8272
8273 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8274 return sctp_hash_endpoint(ep);
8275}
8276
8277/*
8278 * 4.1.3 / 5.1.3 listen()
8279 *
8280 * By default, new associations are not accepted for UDP style sockets.
8281 * An application uses listen() to mark a socket as being able to
8282 * accept new associations.
8283 *
8284 * On TCP style sockets, applications use listen() to ready the SCTP
8285 * endpoint for accepting inbound associations.
8286 *
8287 * On both types of endpoints a backlog of '0' disables listening.
8288 *
8289 * Move a socket to LISTENING state.
8290 */
8291int sctp_inet_listen(struct socket *sock, int backlog)
8292{
8293 struct sock *sk = sock->sk;
8294 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8295 int err = -EINVAL;
8296
8297 if (unlikely(backlog < 0))
8298 return err;
8299
8300 lock_sock(sk);
8301
8302 /* Peeled-off sockets are not allowed to listen(). */
8303 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8304 goto out;
8305
8306 if (sock->state != SS_UNCONNECTED)
8307 goto out;
8308
8309 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8310 goto out;
8311
8312 /* If backlog is zero, disable listening. */
8313 if (!backlog) {
8314 if (sctp_sstate(sk, CLOSED))
8315 goto out;
8316
8317 err = 0;
8318 sctp_unhash_endpoint(ep);
8319 sk->sk_state = SCTP_SS_CLOSED;
8320 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8321 sctp_sk(sk)->bind_hash->fastreuse = 1;
8322 goto out;
8323 }
8324
8325 /* If we are already listening, just update the backlog */
8326 if (sctp_sstate(sk, LISTENING))
8327 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8328 else {
8329 err = sctp_listen_start(sk, backlog);
8330 if (err)
8331 goto out;
8332 }
8333
8334 err = 0;
8335out:
8336 release_sock(sk);
8337 return err;
8338}
8339
8340/*
8341 * This function is done by modeling the current datagram_poll() and the
8342 * tcp_poll(). Note that, based on these implementations, we don't
8343 * lock the socket in this function, even though it seems that,
8344 * ideally, locking or some other mechanisms can be used to ensure
8345 * the integrity of the counters (sndbuf and wmem_alloc) used
8346 * in this place. We assume that we don't need locks either until proven
8347 * otherwise.
8348 *
8349 * Another thing to note is that we include the Async I/O support
8350 * here, again, by modeling the current TCP/UDP code. We don't have
8351 * a good way to test with it yet.
8352 */
8353__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8354{
8355 struct sock *sk = sock->sk;
8356 struct sctp_sock *sp = sctp_sk(sk);
8357 __poll_t mask;
8358
8359 poll_wait(file, sk_sleep(sk), wait);
8360
8361 sock_rps_record_flow(sk);
8362
8363 /* A TCP-style listening socket becomes readable when the accept queue
8364 * is not empty.
8365 */
8366 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8367 return (!list_empty(&sp->ep->asocs)) ?
8368 (EPOLLIN | EPOLLRDNORM) : 0;
8369
8370 mask = 0;
8371
8372 /* Is there any exceptional events? */
8373 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8374 mask |= EPOLLERR |
8375 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8376 if (sk->sk_shutdown & RCV_SHUTDOWN)
8377 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8378 if (sk->sk_shutdown == SHUTDOWN_MASK)
8379 mask |= EPOLLHUP;
8380
8381 /* Is it readable? Reconsider this code with TCP-style support. */
8382 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8383 mask |= EPOLLIN | EPOLLRDNORM;
8384
8385 /* The association is either gone or not ready. */
8386 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8387 return mask;
8388
8389 /* Is it writable? */
8390 if (sctp_writeable(sk)) {
8391 mask |= EPOLLOUT | EPOLLWRNORM;
8392 } else {
8393 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8394 /*
8395 * Since the socket is not locked, the buffer
8396 * might be made available after the writeable check and
8397 * before the bit is set. This could cause a lost I/O
8398 * signal. tcp_poll() has a race breaker for this race
8399 * condition. Based on their implementation, we put
8400 * in the following code to cover it as well.
8401 */
8402 if (sctp_writeable(sk))
8403 mask |= EPOLLOUT | EPOLLWRNORM;
8404 }
8405 return mask;
8406}
8407
8408/********************************************************************
8409 * 2nd Level Abstractions
8410 ********************************************************************/
8411
8412static struct sctp_bind_bucket *sctp_bucket_create(
8413 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8414{
8415 struct sctp_bind_bucket *pp;
8416
8417 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8418 if (pp) {
8419 SCTP_DBG_OBJCNT_INC(bind_bucket);
8420 pp->port = snum;
8421 pp->fastreuse = 0;
8422 INIT_HLIST_HEAD(&pp->owner);
8423 pp->net = net;
8424 hlist_add_head(&pp->node, &head->chain);
8425 }
8426 return pp;
8427}
8428
8429/* Caller must hold hashbucket lock for this tb with local BH disabled */
8430static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8431{
8432 if (pp && hlist_empty(&pp->owner)) {
8433 __hlist_del(&pp->node);
8434 kmem_cache_free(sctp_bucket_cachep, pp);
8435 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8436 }
8437}
8438
8439/* Release this socket's reference to a local port. */
8440static inline void __sctp_put_port(struct sock *sk)
8441{
8442 struct sctp_bind_hashbucket *head =
8443 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8444 inet_sk(sk)->inet_num)];
8445 struct sctp_bind_bucket *pp;
8446
8447 spin_lock(&head->lock);
8448 pp = sctp_sk(sk)->bind_hash;
8449 __sk_del_bind_node(sk);
8450 sctp_sk(sk)->bind_hash = NULL;
8451 inet_sk(sk)->inet_num = 0;
8452 sctp_bucket_destroy(pp);
8453 spin_unlock(&head->lock);
8454}
8455
8456void sctp_put_port(struct sock *sk)
8457{
8458 local_bh_disable();
8459 __sctp_put_port(sk);
8460 local_bh_enable();
8461}
8462
8463/*
8464 * The system picks an ephemeral port and choose an address set equivalent
8465 * to binding with a wildcard address.
8466 * One of those addresses will be the primary address for the association.
8467 * This automatically enables the multihoming capability of SCTP.
8468 */
8469static int sctp_autobind(struct sock *sk)
8470{
8471 union sctp_addr autoaddr;
8472 struct sctp_af *af;
8473 __be16 port;
8474
8475 /* Initialize a local sockaddr structure to INADDR_ANY. */
8476 af = sctp_sk(sk)->pf->af;
8477
8478 port = htons(inet_sk(sk)->inet_num);
8479 af->inaddr_any(&autoaddr, port);
8480
8481 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8482}
8483
8484/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8485 *
8486 * From RFC 2292
8487 * 4.2 The cmsghdr Structure *
8488 *
8489 * When ancillary data is sent or received, any number of ancillary data
8490 * objects can be specified by the msg_control and msg_controllen members of
8491 * the msghdr structure, because each object is preceded by
8492 * a cmsghdr structure defining the object's length (the cmsg_len member).
8493 * Historically Berkeley-derived implementations have passed only one object
8494 * at a time, but this API allows multiple objects to be
8495 * passed in a single call to sendmsg() or recvmsg(). The following example
8496 * shows two ancillary data objects in a control buffer.
8497 *
8498 * |<--------------------------- msg_controllen -------------------------->|
8499 * | |
8500 *
8501 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8502 *
8503 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8504 * | | |
8505 *
8506 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8507 *
8508 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8509 * | | | | |
8510 *
8511 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8512 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8513 *
8514 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8515 *
8516 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8517 * ^
8518 * |
8519 *
8520 * msg_control
8521 * points here
8522 */
8523static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8524{
8525 struct msghdr *my_msg = (struct msghdr *)msg;
8526 struct cmsghdr *cmsg;
8527
8528 for_each_cmsghdr(cmsg, my_msg) {
8529 if (!CMSG_OK(my_msg, cmsg))
8530 return -EINVAL;
8531
8532 /* Should we parse this header or ignore? */
8533 if (cmsg->cmsg_level != IPPROTO_SCTP)
8534 continue;
8535
8536 /* Strictly check lengths following example in SCM code. */
8537 switch (cmsg->cmsg_type) {
8538 case SCTP_INIT:
8539 /* SCTP Socket API Extension
8540 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8541 *
8542 * This cmsghdr structure provides information for
8543 * initializing new SCTP associations with sendmsg().
8544 * The SCTP_INITMSG socket option uses this same data
8545 * structure. This structure is not used for
8546 * recvmsg().
8547 *
8548 * cmsg_level cmsg_type cmsg_data[]
8549 * ------------ ------------ ----------------------
8550 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8551 */
8552 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8553 return -EINVAL;
8554
8555 cmsgs->init = CMSG_DATA(cmsg);
8556 break;
8557
8558 case SCTP_SNDRCV:
8559 /* SCTP Socket API Extension
8560 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8561 *
8562 * This cmsghdr structure specifies SCTP options for
8563 * sendmsg() and describes SCTP header information
8564 * about a received message through recvmsg().
8565 *
8566 * cmsg_level cmsg_type cmsg_data[]
8567 * ------------ ------------ ----------------------
8568 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8569 */
8570 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8571 return -EINVAL;
8572
8573 cmsgs->srinfo = CMSG_DATA(cmsg);
8574
8575 if (cmsgs->srinfo->sinfo_flags &
8576 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8577 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8578 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8579 return -EINVAL;
8580 break;
8581
8582 case SCTP_SNDINFO:
8583 /* SCTP Socket API Extension
8584 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8585 *
8586 * This cmsghdr structure specifies SCTP options for
8587 * sendmsg(). This structure and SCTP_RCVINFO replaces
8588 * SCTP_SNDRCV which has been deprecated.
8589 *
8590 * cmsg_level cmsg_type cmsg_data[]
8591 * ------------ ------------ ---------------------
8592 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8593 */
8594 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8595 return -EINVAL;
8596
8597 cmsgs->sinfo = CMSG_DATA(cmsg);
8598
8599 if (cmsgs->sinfo->snd_flags &
8600 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8601 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8602 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8603 return -EINVAL;
8604 break;
8605 case SCTP_PRINFO:
8606 /* SCTP Socket API Extension
8607 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8608 *
8609 * This cmsghdr structure specifies SCTP options for sendmsg().
8610 *
8611 * cmsg_level cmsg_type cmsg_data[]
8612 * ------------ ------------ ---------------------
8613 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8614 */
8615 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8616 return -EINVAL;
8617
8618 cmsgs->prinfo = CMSG_DATA(cmsg);
8619 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8620 return -EINVAL;
8621
8622 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8623 cmsgs->prinfo->pr_value = 0;
8624 break;
8625 case SCTP_AUTHINFO:
8626 /* SCTP Socket API Extension
8627 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8628 *
8629 * This cmsghdr structure specifies SCTP options for sendmsg().
8630 *
8631 * cmsg_level cmsg_type cmsg_data[]
8632 * ------------ ------------ ---------------------
8633 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8634 */
8635 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8636 return -EINVAL;
8637
8638 cmsgs->authinfo = CMSG_DATA(cmsg);
8639 break;
8640 case SCTP_DSTADDRV4:
8641 case SCTP_DSTADDRV6:
8642 /* SCTP Socket API Extension
8643 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8644 *
8645 * This cmsghdr structure specifies SCTP options for sendmsg().
8646 *
8647 * cmsg_level cmsg_type cmsg_data[]
8648 * ------------ ------------ ---------------------
8649 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8650 * ------------ ------------ ---------------------
8651 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8652 */
8653 cmsgs->addrs_msg = my_msg;
8654 break;
8655 default:
8656 return -EINVAL;
8657 }
8658 }
8659
8660 return 0;
8661}
8662
8663/*
8664 * Wait for a packet..
8665 * Note: This function is the same function as in core/datagram.c
8666 * with a few modifications to make lksctp work.
8667 */
8668static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8669{
8670 int error;
8671 DEFINE_WAIT(wait);
8672
8673 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8674
8675 /* Socket errors? */
8676 error = sock_error(sk);
8677 if (error)
8678 goto out;
8679
8680 if (!skb_queue_empty(&sk->sk_receive_queue))
8681 goto ready;
8682
8683 /* Socket shut down? */
8684 if (sk->sk_shutdown & RCV_SHUTDOWN)
8685 goto out;
8686
8687 /* Sequenced packets can come disconnected. If so we report the
8688 * problem.
8689 */
8690 error = -ENOTCONN;
8691
8692 /* Is there a good reason to think that we may receive some data? */
8693 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8694 goto out;
8695
8696 /* Handle signals. */
8697 if (signal_pending(current))
8698 goto interrupted;
8699
8700 /* Let another process have a go. Since we are going to sleep
8701 * anyway. Note: This may cause odd behaviors if the message
8702 * does not fit in the user's buffer, but this seems to be the
8703 * only way to honor MSG_DONTWAIT realistically.
8704 */
8705 release_sock(sk);
8706 *timeo_p = schedule_timeout(*timeo_p);
8707 lock_sock(sk);
8708
8709ready:
8710 finish_wait(sk_sleep(sk), &wait);
8711 return 0;
8712
8713interrupted:
8714 error = sock_intr_errno(*timeo_p);
8715
8716out:
8717 finish_wait(sk_sleep(sk), &wait);
8718 *err = error;
8719 return error;
8720}
8721
8722/* Receive a datagram.
8723 * Note: This is pretty much the same routine as in core/datagram.c
8724 * with a few changes to make lksctp work.
8725 */
8726struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8727 int noblock, int *err)
8728{
8729 int error;
8730 struct sk_buff *skb;
8731 long timeo;
8732
8733 timeo = sock_rcvtimeo(sk, noblock);
8734
8735 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8736 MAX_SCHEDULE_TIMEOUT);
8737
8738 do {
8739 /* Again only user level code calls this function,
8740 * so nothing interrupt level
8741 * will suddenly eat the receive_queue.
8742 *
8743 * Look at current nfs client by the way...
8744 * However, this function was correct in any case. 8)
8745 */
8746 if (flags & MSG_PEEK) {
8747 skb = skb_peek(&sk->sk_receive_queue);
8748 if (skb)
8749 refcount_inc(&skb->users);
8750 } else {
8751 skb = __skb_dequeue(&sk->sk_receive_queue);
8752 }
8753
8754 if (skb)
8755 return skb;
8756
8757 /* Caller is allowed not to check sk->sk_err before calling. */
8758 error = sock_error(sk);
8759 if (error)
8760 goto no_packet;
8761
8762 if (sk->sk_shutdown & RCV_SHUTDOWN)
8763 break;
8764
8765 if (sk_can_busy_loop(sk)) {
8766 sk_busy_loop(sk, noblock);
8767
8768 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8769 continue;
8770 }
8771
8772 /* User doesn't want to wait. */
8773 error = -EAGAIN;
8774 if (!timeo)
8775 goto no_packet;
8776 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8777
8778 return NULL;
8779
8780no_packet:
8781 *err = error;
8782 return NULL;
8783}
8784
8785/* If sndbuf has changed, wake up per association sndbuf waiters. */
8786static void __sctp_write_space(struct sctp_association *asoc)
8787{
8788 struct sock *sk = asoc->base.sk;
8789
8790 if (sctp_wspace(asoc) <= 0)
8791 return;
8792
8793 if (waitqueue_active(&asoc->wait))
8794 wake_up_interruptible(&asoc->wait);
8795
8796 if (sctp_writeable(sk)) {
8797 struct socket_wq *wq;
8798
8799 rcu_read_lock();
8800 wq = rcu_dereference(sk->sk_wq);
8801 if (wq) {
8802 if (waitqueue_active(&wq->wait))
8803 wake_up_interruptible(&wq->wait);
8804
8805 /* Note that we try to include the Async I/O support
8806 * here by modeling from the current TCP/UDP code.
8807 * We have not tested with it yet.
8808 */
8809 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8810 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8811 }
8812 rcu_read_unlock();
8813 }
8814}
8815
8816static void sctp_wake_up_waiters(struct sock *sk,
8817 struct sctp_association *asoc)
8818{
8819 struct sctp_association *tmp = asoc;
8820
8821 /* We do accounting for the sndbuf space per association,
8822 * so we only need to wake our own association.
8823 */
8824 if (asoc->ep->sndbuf_policy)
8825 return __sctp_write_space(asoc);
8826
8827 /* If association goes down and is just flushing its
8828 * outq, then just normally notify others.
8829 */
8830 if (asoc->base.dead)
8831 return sctp_write_space(sk);
8832
8833 /* Accounting for the sndbuf space is per socket, so we
8834 * need to wake up others, try to be fair and in case of
8835 * other associations, let them have a go first instead
8836 * of just doing a sctp_write_space() call.
8837 *
8838 * Note that we reach sctp_wake_up_waiters() only when
8839 * associations free up queued chunks, thus we are under
8840 * lock and the list of associations on a socket is
8841 * guaranteed not to change.
8842 */
8843 for (tmp = list_next_entry(tmp, asocs); 1;
8844 tmp = list_next_entry(tmp, asocs)) {
8845 /* Manually skip the head element. */
8846 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8847 continue;
8848 /* Wake up association. */
8849 __sctp_write_space(tmp);
8850 /* We've reached the end. */
8851 if (tmp == asoc)
8852 break;
8853 }
8854}
8855
8856/* Do accounting for the sndbuf space.
8857 * Decrement the used sndbuf space of the corresponding association by the
8858 * data size which was just transmitted(freed).
8859 */
8860static void sctp_wfree(struct sk_buff *skb)
8861{
8862 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8863 struct sctp_association *asoc = chunk->asoc;
8864 struct sock *sk = asoc->base.sk;
8865
8866 sk_mem_uncharge(sk, skb->truesize);
8867 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8868 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8869 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8870 &sk->sk_wmem_alloc));
8871
8872 if (chunk->shkey) {
8873 struct sctp_shared_key *shkey = chunk->shkey;
8874
8875 /* refcnt == 2 and !list_empty mean after this release, it's
8876 * not being used anywhere, and it's time to notify userland
8877 * that this shkey can be freed if it's been deactivated.
8878 */
8879 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8880 refcount_read(&shkey->refcnt) == 2) {
8881 struct sctp_ulpevent *ev;
8882
8883 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8884 SCTP_AUTH_FREE_KEY,
8885 GFP_KERNEL);
8886 if (ev)
8887 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8888 }
8889 sctp_auth_shkey_release(chunk->shkey);
8890 }
8891
8892 sock_wfree(skb);
8893 sctp_wake_up_waiters(sk, asoc);
8894
8895 sctp_association_put(asoc);
8896}
8897
8898/* Do accounting for the receive space on the socket.
8899 * Accounting for the association is done in ulpevent.c
8900 * We set this as a destructor for the cloned data skbs so that
8901 * accounting is done at the correct time.
8902 */
8903void sctp_sock_rfree(struct sk_buff *skb)
8904{
8905 struct sock *sk = skb->sk;
8906 struct sctp_ulpevent *event = sctp_skb2event(skb);
8907
8908 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8909
8910 /*
8911 * Mimic the behavior of sock_rfree
8912 */
8913 sk_mem_uncharge(sk, event->rmem_len);
8914}
8915
8916
8917/* Helper function to wait for space in the sndbuf. */
8918static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8919 size_t msg_len)
8920{
8921 struct sock *sk = asoc->base.sk;
8922 long current_timeo = *timeo_p;
8923 DEFINE_WAIT(wait);
8924 int err = 0;
8925
8926 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8927 *timeo_p, msg_len);
8928
8929 /* Increment the association's refcnt. */
8930 sctp_association_hold(asoc);
8931
8932 /* Wait on the association specific sndbuf space. */
8933 for (;;) {
8934 prepare_to_wait_exclusive(&asoc->wait, &wait,
8935 TASK_INTERRUPTIBLE);
8936 if (asoc->base.dead)
8937 goto do_dead;
8938 if (!*timeo_p)
8939 goto do_nonblock;
8940 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8941 goto do_error;
8942 if (signal_pending(current))
8943 goto do_interrupted;
8944 if (sk_under_memory_pressure(sk))
8945 sk_mem_reclaim(sk);
8946 if ((int)msg_len <= sctp_wspace(asoc) &&
8947 sk_wmem_schedule(sk, msg_len))
8948 break;
8949
8950 /* Let another process have a go. Since we are going
8951 * to sleep anyway.
8952 */
8953 release_sock(sk);
8954 current_timeo = schedule_timeout(current_timeo);
8955 lock_sock(sk);
8956 if (sk != asoc->base.sk)
8957 goto do_error;
8958
8959 *timeo_p = current_timeo;
8960 }
8961
8962out:
8963 finish_wait(&asoc->wait, &wait);
8964
8965 /* Release the association's refcnt. */
8966 sctp_association_put(asoc);
8967
8968 return err;
8969
8970do_dead:
8971 err = -ESRCH;
8972 goto out;
8973
8974do_error:
8975 err = -EPIPE;
8976 goto out;
8977
8978do_interrupted:
8979 err = sock_intr_errno(*timeo_p);
8980 goto out;
8981
8982do_nonblock:
8983 err = -EAGAIN;
8984 goto out;
8985}
8986
8987void sctp_data_ready(struct sock *sk)
8988{
8989 struct socket_wq *wq;
8990
8991 rcu_read_lock();
8992 wq = rcu_dereference(sk->sk_wq);
8993 if (skwq_has_sleeper(wq))
8994 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8995 EPOLLRDNORM | EPOLLRDBAND);
8996 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8997 rcu_read_unlock();
8998}
8999
9000/* If socket sndbuf has changed, wake up all per association waiters. */
9001void sctp_write_space(struct sock *sk)
9002{
9003 struct sctp_association *asoc;
9004
9005 /* Wake up the tasks in each wait queue. */
9006 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9007 __sctp_write_space(asoc);
9008 }
9009}
9010
9011/* Is there any sndbuf space available on the socket?
9012 *
9013 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9014 * associations on the same socket. For a UDP-style socket with
9015 * multiple associations, it is possible for it to be "unwriteable"
9016 * prematurely. I assume that this is acceptable because
9017 * a premature "unwriteable" is better than an accidental "writeable" which
9018 * would cause an unwanted block under certain circumstances. For the 1-1
9019 * UDP-style sockets or TCP-style sockets, this code should work.
9020 * - Daisy
9021 */
9022static bool sctp_writeable(struct sock *sk)
9023{
9024 return sk->sk_sndbuf > sk->sk_wmem_queued;
9025}
9026
9027/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9028 * returns immediately with EINPROGRESS.
9029 */
9030static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9031{
9032 struct sock *sk = asoc->base.sk;
9033 int err = 0;
9034 long current_timeo = *timeo_p;
9035 DEFINE_WAIT(wait);
9036
9037 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9038
9039 /* Increment the association's refcnt. */
9040 sctp_association_hold(asoc);
9041
9042 for (;;) {
9043 prepare_to_wait_exclusive(&asoc->wait, &wait,
9044 TASK_INTERRUPTIBLE);
9045 if (!*timeo_p)
9046 goto do_nonblock;
9047 if (sk->sk_shutdown & RCV_SHUTDOWN)
9048 break;
9049 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9050 asoc->base.dead)
9051 goto do_error;
9052 if (signal_pending(current))
9053 goto do_interrupted;
9054
9055 if (sctp_state(asoc, ESTABLISHED))
9056 break;
9057
9058 /* Let another process have a go. Since we are going
9059 * to sleep anyway.
9060 */
9061 release_sock(sk);
9062 current_timeo = schedule_timeout(current_timeo);
9063 lock_sock(sk);
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_error:
9077 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9078 err = -ETIMEDOUT;
9079 else
9080 err = -ECONNREFUSED;
9081 goto out;
9082
9083do_interrupted:
9084 err = sock_intr_errno(*timeo_p);
9085 goto out;
9086
9087do_nonblock:
9088 err = -EINPROGRESS;
9089 goto out;
9090}
9091
9092static int sctp_wait_for_accept(struct sock *sk, long timeo)
9093{
9094 struct sctp_endpoint *ep;
9095 int err = 0;
9096 DEFINE_WAIT(wait);
9097
9098 ep = sctp_sk(sk)->ep;
9099
9100
9101 for (;;) {
9102 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9103 TASK_INTERRUPTIBLE);
9104
9105 if (list_empty(&ep->asocs)) {
9106 release_sock(sk);
9107 timeo = schedule_timeout(timeo);
9108 lock_sock(sk);
9109 }
9110
9111 err = -EINVAL;
9112 if (!sctp_sstate(sk, LISTENING))
9113 break;
9114
9115 err = 0;
9116 if (!list_empty(&ep->asocs))
9117 break;
9118
9119 err = sock_intr_errno(timeo);
9120 if (signal_pending(current))
9121 break;
9122
9123 err = -EAGAIN;
9124 if (!timeo)
9125 break;
9126 }
9127
9128 finish_wait(sk_sleep(sk), &wait);
9129
9130 return err;
9131}
9132
9133static void sctp_wait_for_close(struct sock *sk, long timeout)
9134{
9135 DEFINE_WAIT(wait);
9136
9137 do {
9138 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9139 if (list_empty(&sctp_sk(sk)->ep->asocs))
9140 break;
9141 release_sock(sk);
9142 timeout = schedule_timeout(timeout);
9143 lock_sock(sk);
9144 } while (!signal_pending(current) && timeout);
9145
9146 finish_wait(sk_sleep(sk), &wait);
9147}
9148
9149static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9150{
9151 struct sk_buff *frag;
9152
9153 if (!skb->data_len)
9154 goto done;
9155
9156 /* Don't forget the fragments. */
9157 skb_walk_frags(skb, frag)
9158 sctp_skb_set_owner_r_frag(frag, sk);
9159
9160done:
9161 sctp_skb_set_owner_r(skb, sk);
9162}
9163
9164void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9165 struct sctp_association *asoc)
9166{
9167 struct inet_sock *inet = inet_sk(sk);
9168 struct inet_sock *newinet;
9169 struct sctp_sock *sp = sctp_sk(sk);
9170 struct sctp_endpoint *ep = sp->ep;
9171
9172 newsk->sk_type = sk->sk_type;
9173 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9174 newsk->sk_flags = sk->sk_flags;
9175 newsk->sk_tsflags = sk->sk_tsflags;
9176 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9177 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9178 newsk->sk_reuse = sk->sk_reuse;
9179 sctp_sk(newsk)->reuse = sp->reuse;
9180
9181 newsk->sk_shutdown = sk->sk_shutdown;
9182 newsk->sk_destruct = sctp_destruct_sock;
9183 newsk->sk_family = sk->sk_family;
9184 newsk->sk_protocol = IPPROTO_SCTP;
9185 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9186 newsk->sk_sndbuf = sk->sk_sndbuf;
9187 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9188 newsk->sk_lingertime = sk->sk_lingertime;
9189 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9190 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9191 newsk->sk_rxhash = sk->sk_rxhash;
9192
9193 newinet = inet_sk(newsk);
9194
9195 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9196 * getsockname() and getpeername()
9197 */
9198 newinet->inet_sport = inet->inet_sport;
9199 newinet->inet_saddr = inet->inet_saddr;
9200 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9201 newinet->inet_dport = htons(asoc->peer.port);
9202 newinet->pmtudisc = inet->pmtudisc;
9203 newinet->inet_id = prandom_u32();
9204
9205 newinet->uc_ttl = inet->uc_ttl;
9206 newinet->mc_loop = 1;
9207 newinet->mc_ttl = 1;
9208 newinet->mc_index = 0;
9209 newinet->mc_list = NULL;
9210
9211 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9212 net_enable_timestamp();
9213
9214 /* Set newsk security attributes from orginal sk and connection
9215 * security attribute from ep.
9216 */
9217 security_sctp_sk_clone(ep, sk, newsk);
9218}
9219
9220static inline void sctp_copy_descendant(struct sock *sk_to,
9221 const struct sock *sk_from)
9222{
9223 size_t ancestor_size = sizeof(struct inet_sock);
9224
9225 ancestor_size += sk_from->sk_prot->obj_size;
9226 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9227 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9228}
9229
9230/* Populate the fields of the newsk from the oldsk and migrate the assoc
9231 * and its messages to the newsk.
9232 */
9233static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9234 struct sctp_association *assoc,
9235 enum sctp_socket_type type)
9236{
9237 struct sctp_sock *oldsp = sctp_sk(oldsk);
9238 struct sctp_sock *newsp = sctp_sk(newsk);
9239 struct sctp_bind_bucket *pp; /* hash list port iterator */
9240 struct sctp_endpoint *newep = newsp->ep;
9241 struct sk_buff *skb, *tmp;
9242 struct sctp_ulpevent *event;
9243 struct sctp_bind_hashbucket *head;
9244 int err;
9245
9246 /* Migrate socket buffer sizes and all the socket level options to the
9247 * new socket.
9248 */
9249 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9250 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9251 /* Brute force copy old sctp opt. */
9252 sctp_copy_descendant(newsk, oldsk);
9253
9254 /* Restore the ep value that was overwritten with the above structure
9255 * copy.
9256 */
9257 newsp->ep = newep;
9258 newsp->hmac = NULL;
9259
9260 /* Hook this new socket in to the bind_hash list. */
9261 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9262 inet_sk(oldsk)->inet_num)];
9263 spin_lock_bh(&head->lock);
9264 pp = sctp_sk(oldsk)->bind_hash;
9265 sk_add_bind_node(newsk, &pp->owner);
9266 sctp_sk(newsk)->bind_hash = pp;
9267 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9268 spin_unlock_bh(&head->lock);
9269
9270 /* Copy the bind_addr list from the original endpoint to the new
9271 * endpoint so that we can handle restarts properly
9272 */
9273 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9274 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9275 if (err)
9276 return err;
9277
9278 /* New ep's auth_hmacs should be set if old ep's is set, in case
9279 * that net->sctp.auth_enable has been changed to 0 by users and
9280 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9281 */
9282 if (oldsp->ep->auth_hmacs) {
9283 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9284 if (err)
9285 return err;
9286 }
9287
9288 /* Move any messages in the old socket's receive queue that are for the
9289 * peeled off association to the new socket's receive queue.
9290 */
9291 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9292 event = sctp_skb2event(skb);
9293 if (event->asoc == assoc) {
9294 __skb_unlink(skb, &oldsk->sk_receive_queue);
9295 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9296 sctp_skb_set_owner_r_frag(skb, newsk);
9297 }
9298 }
9299
9300 /* Clean up any messages pending delivery due to partial
9301 * delivery. Three cases:
9302 * 1) No partial deliver; no work.
9303 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9304 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9305 */
9306 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9307
9308 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9309 struct sk_buff_head *queue;
9310
9311 /* Decide which queue to move pd_lobby skbs to. */
9312 if (assoc->ulpq.pd_mode) {
9313 queue = &newsp->pd_lobby;
9314 } else
9315 queue = &newsk->sk_receive_queue;
9316
9317 /* Walk through the pd_lobby, looking for skbs that
9318 * need moved to the new socket.
9319 */
9320 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9321 event = sctp_skb2event(skb);
9322 if (event->asoc == assoc) {
9323 __skb_unlink(skb, &oldsp->pd_lobby);
9324 __skb_queue_tail(queue, skb);
9325 sctp_skb_set_owner_r_frag(skb, newsk);
9326 }
9327 }
9328
9329 /* Clear up any skbs waiting for the partial
9330 * delivery to finish.
9331 */
9332 if (assoc->ulpq.pd_mode)
9333 sctp_clear_pd(oldsk, NULL);
9334
9335 }
9336
9337 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9338
9339 /* Set the type of socket to indicate that it is peeled off from the
9340 * original UDP-style socket or created with the accept() call on a
9341 * TCP-style socket..
9342 */
9343 newsp->type = type;
9344
9345 /* Mark the new socket "in-use" by the user so that any packets
9346 * that may arrive on the association after we've moved it are
9347 * queued to the backlog. This prevents a potential race between
9348 * backlog processing on the old socket and new-packet processing
9349 * on the new socket.
9350 *
9351 * The caller has just allocated newsk so we can guarantee that other
9352 * paths won't try to lock it and then oldsk.
9353 */
9354 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9355 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9356 sctp_assoc_migrate(assoc, newsk);
9357 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9358
9359 /* If the association on the newsk is already closed before accept()
9360 * is called, set RCV_SHUTDOWN flag.
9361 */
9362 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9363 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9364 newsk->sk_shutdown |= RCV_SHUTDOWN;
9365 } else {
9366 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9367 }
9368
9369 release_sock(newsk);
9370
9371 return 0;
9372}
9373
9374
9375/* This proto struct describes the ULP interface for SCTP. */
9376struct proto sctp_prot = {
9377 .name = "SCTP",
9378 .owner = THIS_MODULE,
9379 .close = sctp_close,
9380 .disconnect = sctp_disconnect,
9381 .accept = sctp_accept,
9382 .ioctl = sctp_ioctl,
9383 .init = sctp_init_sock,
9384 .destroy = sctp_destroy_sock,
9385 .shutdown = sctp_shutdown,
9386 .setsockopt = sctp_setsockopt,
9387 .getsockopt = sctp_getsockopt,
9388 .sendmsg = sctp_sendmsg,
9389 .recvmsg = sctp_recvmsg,
9390 .bind = sctp_bind,
9391 .bind_add = sctp_bind_add,
9392 .backlog_rcv = sctp_backlog_rcv,
9393 .hash = sctp_hash,
9394 .unhash = sctp_unhash,
9395 .no_autobind = true,
9396 .obj_size = sizeof(struct sctp_sock),
9397 .useroffset = offsetof(struct sctp_sock, subscribe),
9398 .usersize = offsetof(struct sctp_sock, initmsg) -
9399 offsetof(struct sctp_sock, subscribe) +
9400 sizeof_field(struct sctp_sock, initmsg),
9401 .sysctl_mem = sysctl_sctp_mem,
9402 .sysctl_rmem = sysctl_sctp_rmem,
9403 .sysctl_wmem = sysctl_sctp_wmem,
9404 .memory_pressure = &sctp_memory_pressure,
9405 .enter_memory_pressure = sctp_enter_memory_pressure,
9406 .memory_allocated = &sctp_memory_allocated,
9407 .sockets_allocated = &sctp_sockets_allocated,
9408};
9409
9410#if IS_ENABLED(CONFIG_IPV6)
9411
9412#include <net/transp_v6.h>
9413static void sctp_v6_destroy_sock(struct sock *sk)
9414{
9415 sctp_destroy_sock(sk);
9416 inet6_destroy_sock(sk);
9417}
9418
9419struct proto sctpv6_prot = {
9420 .name = "SCTPv6",
9421 .owner = THIS_MODULE,
9422 .close = sctp_close,
9423 .disconnect = sctp_disconnect,
9424 .accept = sctp_accept,
9425 .ioctl = sctp_ioctl,
9426 .init = sctp_init_sock,
9427 .destroy = sctp_v6_destroy_sock,
9428 .shutdown = sctp_shutdown,
9429 .setsockopt = sctp_setsockopt,
9430 .getsockopt = sctp_getsockopt,
9431 .sendmsg = sctp_sendmsg,
9432 .recvmsg = sctp_recvmsg,
9433 .bind = sctp_bind,
9434 .bind_add = sctp_bind_add,
9435 .backlog_rcv = sctp_backlog_rcv,
9436 .hash = sctp_hash,
9437 .unhash = sctp_unhash,
9438 .no_autobind = true,
9439 .obj_size = sizeof(struct sctp6_sock),
9440 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9441 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9442 offsetof(struct sctp6_sock, sctp.subscribe) +
9443 sizeof_field(struct sctp6_sock, sctp.initmsg),
9444 .sysctl_mem = sysctl_sctp_mem,
9445 .sysctl_rmem = sysctl_sctp_rmem,
9446 .sysctl_wmem = sysctl_sctp_wmem,
9447 .memory_pressure = &sctp_memory_pressure,
9448 .enter_memory_pressure = sctp_enter_memory_pressure,
9449 .memory_allocated = &sctp_memory_allocated,
9450 .sockets_allocated = &sctp_sockets_allocated,
9451};
9452#endif /* IS_ENABLED(CONFIG_IPV6) */