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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 Intel Corp.
7 * Copyright (c) 2001 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
10 * This file is part of the SCTP kernel implementation
11 *
12 * Initialization/cleanup for SCTP protocol support.
13 *
14 * Please send any bug reports or fixes you make to the
15 * email address(es):
16 * lksctp developers <linux-sctp@vger.kernel.org>
17 *
18 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Sridhar Samudrala <sri@us.ibm.com>
23 * Daisy Chang <daisyc@us.ibm.com>
24 * Ardelle Fan <ardelle.fan@intel.com>
25 */
26
27#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/netdevice.h>
32#include <linux/inetdevice.h>
33#include <linux/seq_file.h>
34#include <linux/memblock.h>
35#include <linux/highmem.h>
36#include <linux/slab.h>
37#include <net/net_namespace.h>
38#include <net/protocol.h>
39#include <net/ip.h>
40#include <net/ipv6.h>
41#include <net/route.h>
42#include <net/sctp/sctp.h>
43#include <net/addrconf.h>
44#include <net/inet_common.h>
45#include <net/inet_ecn.h>
46#include <net/udp_tunnel.h>
47#include <net/inet_dscp.h>
48
49#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
50
51/* Global data structures. */
52struct sctp_globals sctp_globals __read_mostly;
53
54struct idr sctp_assocs_id;
55DEFINE_SPINLOCK(sctp_assocs_id_lock);
56
57static struct sctp_pf *sctp_pf_inet6_specific;
58static struct sctp_pf *sctp_pf_inet_specific;
59static struct sctp_af *sctp_af_v4_specific;
60static struct sctp_af *sctp_af_v6_specific;
61
62struct kmem_cache *sctp_chunk_cachep __read_mostly;
63struct kmem_cache *sctp_bucket_cachep __read_mostly;
64
65long sysctl_sctp_mem[3];
66int sysctl_sctp_rmem[3];
67int sysctl_sctp_wmem[3];
68
69/* Private helper to extract ipv4 address and stash them in
70 * the protocol structure.
71 */
72static void sctp_v4_copy_addrlist(struct list_head *addrlist,
73 struct net_device *dev)
74{
75 struct in_device *in_dev;
76 struct in_ifaddr *ifa;
77 struct sctp_sockaddr_entry *addr;
78
79 rcu_read_lock();
80 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
81 rcu_read_unlock();
82 return;
83 }
84
85 in_dev_for_each_ifa_rcu(ifa, in_dev) {
86 /* Add the address to the local list. */
87 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
88 if (addr) {
89 addr->a.v4.sin_family = AF_INET;
90 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
91 addr->valid = 1;
92 INIT_LIST_HEAD(&addr->list);
93 list_add_tail(&addr->list, addrlist);
94 }
95 }
96
97 rcu_read_unlock();
98}
99
100/* Extract our IP addresses from the system and stash them in the
101 * protocol structure.
102 */
103static void sctp_get_local_addr_list(struct net *net)
104{
105 struct net_device *dev;
106 struct list_head *pos;
107 struct sctp_af *af;
108
109 rcu_read_lock();
110 for_each_netdev_rcu(net, dev) {
111 list_for_each(pos, &sctp_address_families) {
112 af = list_entry(pos, struct sctp_af, list);
113 af->copy_addrlist(&net->sctp.local_addr_list, dev);
114 }
115 }
116 rcu_read_unlock();
117}
118
119/* Free the existing local addresses. */
120static void sctp_free_local_addr_list(struct net *net)
121{
122 struct sctp_sockaddr_entry *addr;
123 struct list_head *pos, *temp;
124
125 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
126 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
127 list_del(pos);
128 kfree(addr);
129 }
130}
131
132/* Copy the local addresses which are valid for 'scope' into 'bp'. */
133int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
134 enum sctp_scope scope, gfp_t gfp, int copy_flags)
135{
136 struct sctp_sockaddr_entry *addr;
137 union sctp_addr laddr;
138 int error = 0;
139
140 rcu_read_lock();
141 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
142 if (!addr->valid)
143 continue;
144 if (!sctp_in_scope(net, &addr->a, scope))
145 continue;
146
147 /* Now that the address is in scope, check to see if
148 * the address type is really supported by the local
149 * sock as well as the remote peer.
150 */
151 if (addr->a.sa.sa_family == AF_INET &&
152 (!(copy_flags & SCTP_ADDR4_ALLOWED) ||
153 !(copy_flags & SCTP_ADDR4_PEERSUPP)))
154 continue;
155 if (addr->a.sa.sa_family == AF_INET6 &&
156 (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
157 !(copy_flags & SCTP_ADDR6_PEERSUPP)))
158 continue;
159
160 laddr = addr->a;
161 /* also works for setting ipv6 address port */
162 laddr.v4.sin_port = htons(bp->port);
163 if (sctp_bind_addr_state(bp, &laddr) != -1)
164 continue;
165
166 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
167 SCTP_ADDR_SRC, GFP_ATOMIC);
168 if (error)
169 break;
170 }
171
172 rcu_read_unlock();
173 return error;
174}
175
176/* Copy over any ip options */
177static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
178{
179 struct inet_sock *newinet, *inet = inet_sk(sk);
180 struct ip_options_rcu *inet_opt, *newopt = NULL;
181
182 newinet = inet_sk(newsk);
183
184 rcu_read_lock();
185 inet_opt = rcu_dereference(inet->inet_opt);
186 if (inet_opt) {
187 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
188 inet_opt->opt.optlen, GFP_ATOMIC);
189 if (newopt)
190 memcpy(newopt, inet_opt, sizeof(*inet_opt) +
191 inet_opt->opt.optlen);
192 else
193 pr_err("%s: Failed to copy ip options\n", __func__);
194 }
195 RCU_INIT_POINTER(newinet->inet_opt, newopt);
196 rcu_read_unlock();
197}
198
199/* Account for the IP options */
200static int sctp_v4_ip_options_len(struct sock *sk)
201{
202 struct inet_sock *inet = inet_sk(sk);
203 struct ip_options_rcu *inet_opt;
204 int len = 0;
205
206 rcu_read_lock();
207 inet_opt = rcu_dereference(inet->inet_opt);
208 if (inet_opt)
209 len = inet_opt->opt.optlen;
210
211 rcu_read_unlock();
212 return len;
213}
214
215/* Initialize a sctp_addr from in incoming skb. */
216static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
217 int is_saddr)
218{
219 /* Always called on head skb, so this is safe */
220 struct sctphdr *sh = sctp_hdr(skb);
221 struct sockaddr_in *sa = &addr->v4;
222
223 addr->v4.sin_family = AF_INET;
224
225 if (is_saddr) {
226 sa->sin_port = sh->source;
227 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
228 } else {
229 sa->sin_port = sh->dest;
230 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
231 }
232 memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
233}
234
235/* Initialize an sctp_addr from a socket. */
236static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
237{
238 addr->v4.sin_family = AF_INET;
239 addr->v4.sin_port = 0;
240 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
241 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
242}
243
244/* Initialize sk->sk_rcv_saddr from sctp_addr. */
245static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
246{
247 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
248}
249
250/* Initialize sk->sk_daddr from sctp_addr. */
251static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
252{
253 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
254}
255
256/* Initialize a sctp_addr from an address parameter. */
257static bool sctp_v4_from_addr_param(union sctp_addr *addr,
258 union sctp_addr_param *param,
259 __be16 port, int iif)
260{
261 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param))
262 return false;
263
264 addr->v4.sin_family = AF_INET;
265 addr->v4.sin_port = port;
266 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
267 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
268
269 return true;
270}
271
272/* Initialize an address parameter from a sctp_addr and return the length
273 * of the address parameter.
274 */
275static int sctp_v4_to_addr_param(const union sctp_addr *addr,
276 union sctp_addr_param *param)
277{
278 int length = sizeof(struct sctp_ipv4addr_param);
279
280 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
281 param->v4.param_hdr.length = htons(length);
282 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
283
284 return length;
285}
286
287/* Initialize a sctp_addr from a dst_entry. */
288static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
289 __be16 port)
290{
291 saddr->v4.sin_family = AF_INET;
292 saddr->v4.sin_port = port;
293 saddr->v4.sin_addr.s_addr = fl4->saddr;
294 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
295}
296
297/* Compare two addresses exactly. */
298static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
299 const union sctp_addr *addr2)
300{
301 if (addr1->sa.sa_family != addr2->sa.sa_family)
302 return 0;
303 if (addr1->v4.sin_port != addr2->v4.sin_port)
304 return 0;
305 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
306 return 0;
307
308 return 1;
309}
310
311/* Initialize addr struct to INADDR_ANY. */
312static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
316 addr->v4.sin_port = port;
317 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
318}
319
320/* Is this a wildcard address? */
321static int sctp_v4_is_any(const union sctp_addr *addr)
322{
323 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
324}
325
326/* This function checks if the address is a valid address to be used for
327 * SCTP binding.
328 *
329 * Output:
330 * Return 0 - If the address is a non-unicast or an illegal address.
331 * Return 1 - If the address is a unicast.
332 */
333static int sctp_v4_addr_valid(union sctp_addr *addr,
334 struct sctp_sock *sp,
335 const struct sk_buff *skb)
336{
337 /* IPv4 addresses not allowed */
338 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
339 return 0;
340
341 /* Is this a non-unicast address or a unusable SCTP address? */
342 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
343 return 0;
344
345 /* Is this a broadcast address? */
346 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
347 return 0;
348
349 return 1;
350}
351
352/* Should this be available for binding? */
353static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
354{
355 struct sock *sk = &sp->inet.sk;
356 struct net *net = sock_net(sk);
357 int tb_id = RT_TABLE_LOCAL;
358 int ret;
359
360 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ?: tb_id;
361 ret = inet_addr_type_table(net, addr->v4.sin_addr.s_addr, tb_id);
362 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
363 ret != RTN_LOCAL &&
364 !inet_test_bit(FREEBIND, sk) &&
365 !READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind))
366 return 0;
367
368 if (ipv6_only_sock(sctp_opt2sk(sp)))
369 return 0;
370
371 return 1;
372}
373
374/* Checking the loopback, private and other address scopes as defined in
375 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
376 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
377 *
378 * Level 0 - unusable SCTP addresses
379 * Level 1 - loopback address
380 * Level 2 - link-local addresses
381 * Level 3 - private addresses.
382 * Level 4 - global addresses
383 * For INIT and INIT-ACK address list, let L be the level of
384 * requested destination address, sender and receiver
385 * SHOULD include all of its addresses with level greater
386 * than or equal to L.
387 *
388 * IPv4 scoping can be controlled through sysctl option
389 * net.sctp.addr_scope_policy
390 */
391static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
392{
393 enum sctp_scope retval;
394
395 /* Check for unusable SCTP addresses. */
396 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
397 retval = SCTP_SCOPE_UNUSABLE;
398 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
399 retval = SCTP_SCOPE_LOOPBACK;
400 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
401 retval = SCTP_SCOPE_LINK;
402 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
403 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
404 ipv4_is_private_192(addr->v4.sin_addr.s_addr) ||
405 ipv4_is_test_198(addr->v4.sin_addr.s_addr)) {
406 retval = SCTP_SCOPE_PRIVATE;
407 } else {
408 retval = SCTP_SCOPE_GLOBAL;
409 }
410
411 return retval;
412}
413
414/* Returns a valid dst cache entry for the given source and destination ip
415 * addresses. If an association is passed, trys to get a dst entry with a
416 * source address that matches an address in the bind address list.
417 */
418static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
419 struct flowi *fl, struct sock *sk)
420{
421 struct sctp_association *asoc = t->asoc;
422 struct rtable *rt;
423 struct flowi _fl;
424 struct flowi4 *fl4 = &_fl.u.ip4;
425 struct sctp_bind_addr *bp;
426 struct sctp_sockaddr_entry *laddr;
427 struct dst_entry *dst = NULL;
428 union sctp_addr *daddr = &t->ipaddr;
429 union sctp_addr dst_saddr;
430 u8 tos = READ_ONCE(inet_sk(sk)->tos);
431
432 if (t->dscp & SCTP_DSCP_SET_MASK)
433 tos = t->dscp & SCTP_DSCP_VAL_MASK;
434 memset(&_fl, 0x0, sizeof(_fl));
435 fl4->daddr = daddr->v4.sin_addr.s_addr;
436 fl4->fl4_dport = daddr->v4.sin_port;
437 fl4->flowi4_proto = IPPROTO_SCTP;
438 if (asoc) {
439 fl4->flowi4_tos = tos & INET_DSCP_MASK;
440 fl4->flowi4_scope = ip_sock_rt_scope(asoc->base.sk);
441 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
442 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
443 }
444 if (saddr) {
445 fl4->saddr = saddr->v4.sin_addr.s_addr;
446 if (!fl4->fl4_sport)
447 fl4->fl4_sport = saddr->v4.sin_port;
448 }
449
450 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
451 &fl4->saddr);
452
453 rt = ip_route_output_key(sock_net(sk), fl4);
454 if (!IS_ERR(rt)) {
455 dst = &rt->dst;
456 t->dst = dst;
457 memcpy(fl, &_fl, sizeof(_fl));
458 }
459
460 /* If there is no association or if a source address is passed, no
461 * more validation is required.
462 */
463 if (!asoc || saddr)
464 goto out;
465
466 bp = &asoc->base.bind_addr;
467
468 if (dst) {
469 /* Walk through the bind address list and look for a bind
470 * address that matches the source address of the returned dst.
471 */
472 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
473 rcu_read_lock();
474 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
475 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
476 (laddr->state != SCTP_ADDR_SRC &&
477 !asoc->src_out_of_asoc_ok))
478 continue;
479 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
480 goto out_unlock;
481 }
482 rcu_read_unlock();
483
484 /* None of the bound addresses match the source address of the
485 * dst. So release it.
486 */
487 dst_release(dst);
488 dst = NULL;
489 }
490
491 /* Walk through the bind address list and try to get a dst that
492 * matches a bind address as the source address.
493 */
494 rcu_read_lock();
495 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
496 struct net_device *odev;
497
498 if (!laddr->valid)
499 continue;
500 if (laddr->state != SCTP_ADDR_SRC ||
501 AF_INET != laddr->a.sa.sa_family)
502 continue;
503
504 fl4->fl4_sport = laddr->a.v4.sin_port;
505 flowi4_update_output(fl4, asoc->base.sk->sk_bound_dev_if,
506 daddr->v4.sin_addr.s_addr,
507 laddr->a.v4.sin_addr.s_addr);
508
509 rt = ip_route_output_key(sock_net(sk), fl4);
510 if (IS_ERR(rt))
511 continue;
512
513 /* Ensure the src address belongs to the output
514 * interface.
515 */
516 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
517 false);
518 if (!odev || odev->ifindex != fl4->flowi4_oif) {
519 if (!dst) {
520 dst = &rt->dst;
521 t->dst = dst;
522 memcpy(fl, &_fl, sizeof(_fl));
523 } else {
524 dst_release(&rt->dst);
525 }
526 continue;
527 }
528
529 dst_release(dst);
530 dst = &rt->dst;
531 t->dst = dst;
532 memcpy(fl, &_fl, sizeof(_fl));
533 break;
534 }
535
536out_unlock:
537 rcu_read_unlock();
538out:
539 if (dst) {
540 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
541 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
542 } else {
543 t->dst = NULL;
544 pr_debug("no route\n");
545 }
546}
547
548/* For v4, the source address is cached in the route entry(dst). So no need
549 * to cache it separately and hence this is an empty routine.
550 */
551static void sctp_v4_get_saddr(struct sctp_sock *sk,
552 struct sctp_transport *t,
553 struct flowi *fl)
554{
555 union sctp_addr *saddr = &t->saddr;
556 struct rtable *rt = dst_rtable(t->dst);
557
558 if (rt) {
559 saddr->v4.sin_family = AF_INET;
560 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
561 }
562}
563
564/* What interface did this skb arrive on? */
565static int sctp_v4_skb_iif(const struct sk_buff *skb)
566{
567 return inet_iif(skb);
568}
569
570static int sctp_v4_skb_sdif(const struct sk_buff *skb)
571{
572 return inet_sdif(skb);
573}
574
575/* Was this packet marked by Explicit Congestion Notification? */
576static int sctp_v4_is_ce(const struct sk_buff *skb)
577{
578 return INET_ECN_is_ce(ip_hdr(skb)->tos);
579}
580
581/* Create and initialize a new sk for the socket returned by accept(). */
582static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
583 struct sctp_association *asoc,
584 bool kern)
585{
586 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
587 sk->sk_prot, kern);
588 struct inet_sock *newinet;
589
590 if (!newsk)
591 goto out;
592
593 sock_init_data(NULL, newsk);
594
595 sctp_copy_sock(newsk, sk, asoc);
596 sock_reset_flag(newsk, SOCK_ZAPPED);
597
598 sctp_v4_copy_ip_options(sk, newsk);
599
600 newinet = inet_sk(newsk);
601
602 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
603
604 if (newsk->sk_prot->init(newsk)) {
605 sk_common_release(newsk);
606 newsk = NULL;
607 }
608
609out:
610 return newsk;
611}
612
613static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
614{
615 /* No address mapping for V4 sockets */
616 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
617 return sizeof(struct sockaddr_in);
618}
619
620/* Dump the v4 addr to the seq file. */
621static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
622{
623 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
624}
625
626static void sctp_v4_ecn_capable(struct sock *sk)
627{
628 INET_ECN_xmit(sk);
629}
630
631static void sctp_addr_wq_timeout_handler(struct timer_list *t)
632{
633 struct net *net = from_timer(net, t, sctp.addr_wq_timer);
634 struct sctp_sockaddr_entry *addrw, *temp;
635 struct sctp_sock *sp;
636
637 spin_lock_bh(&net->sctp.addr_wq_lock);
638
639 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
640 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
641 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
642 addrw->state, addrw);
643
644#if IS_ENABLED(CONFIG_IPV6)
645 /* Now we send an ASCONF for each association */
646 /* Note. we currently don't handle link local IPv6 addressees */
647 if (addrw->a.sa.sa_family == AF_INET6) {
648 struct in6_addr *in6;
649
650 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
651 IPV6_ADDR_LINKLOCAL)
652 goto free_next;
653
654 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
655 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
656 addrw->state == SCTP_ADDR_NEW) {
657 unsigned long timeo_val;
658
659 pr_debug("%s: this is on DAD, trying %d sec "
660 "later\n", __func__,
661 SCTP_ADDRESS_TICK_DELAY);
662
663 timeo_val = jiffies;
664 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
665 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
666 break;
667 }
668 }
669#endif
670 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
671 struct sock *sk;
672
673 sk = sctp_opt2sk(sp);
674 /* ignore bound-specific endpoints */
675 if (!sctp_is_ep_boundall(sk))
676 continue;
677 bh_lock_sock(sk);
678 if (sctp_asconf_mgmt(sp, addrw) < 0)
679 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
680 bh_unlock_sock(sk);
681 }
682#if IS_ENABLED(CONFIG_IPV6)
683free_next:
684#endif
685 list_del(&addrw->list);
686 kfree(addrw);
687 }
688 spin_unlock_bh(&net->sctp.addr_wq_lock);
689}
690
691static void sctp_free_addr_wq(struct net *net)
692{
693 struct sctp_sockaddr_entry *addrw;
694 struct sctp_sockaddr_entry *temp;
695
696 spin_lock_bh(&net->sctp.addr_wq_lock);
697 del_timer(&net->sctp.addr_wq_timer);
698 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
699 list_del(&addrw->list);
700 kfree(addrw);
701 }
702 spin_unlock_bh(&net->sctp.addr_wq_lock);
703}
704
705/* lookup the entry for the same address in the addr_waitq
706 * sctp_addr_wq MUST be locked
707 */
708static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
709 struct sctp_sockaddr_entry *addr)
710{
711 struct sctp_sockaddr_entry *addrw;
712
713 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
714 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
715 continue;
716 if (addrw->a.sa.sa_family == AF_INET) {
717 if (addrw->a.v4.sin_addr.s_addr ==
718 addr->a.v4.sin_addr.s_addr)
719 return addrw;
720 } else if (addrw->a.sa.sa_family == AF_INET6) {
721 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
722 &addr->a.v6.sin6_addr))
723 return addrw;
724 }
725 }
726 return NULL;
727}
728
729void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
730{
731 struct sctp_sockaddr_entry *addrw;
732 unsigned long timeo_val;
733
734 /* first, we check if an opposite message already exist in the queue.
735 * If we found such message, it is removed.
736 * This operation is a bit stupid, but the DHCP client attaches the
737 * new address after a couple of addition and deletion of that address
738 */
739
740 spin_lock_bh(&net->sctp.addr_wq_lock);
741
742 /* Avoid searching the queue or modifying it if there are no consumers,
743 * as it can lead to performance degradation if addresses are modified
744 * en-masse.
745 *
746 * If the queue already contains some events, update it anyway to avoid
747 * ugly races between new sessions and new address events.
748 */
749 if (list_empty(&net->sctp.auto_asconf_splist) &&
750 list_empty(&net->sctp.addr_waitq)) {
751 spin_unlock_bh(&net->sctp.addr_wq_lock);
752 return;
753 }
754
755 /* Offsets existing events in addr_wq */
756 addrw = sctp_addr_wq_lookup(net, addr);
757 if (addrw) {
758 if (addrw->state != cmd) {
759 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
760 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
761 &net->sctp.addr_waitq);
762
763 list_del(&addrw->list);
764 kfree(addrw);
765 }
766 spin_unlock_bh(&net->sctp.addr_wq_lock);
767 return;
768 }
769
770 /* OK, we have to add the new address to the wait queue */
771 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
772 if (addrw == NULL) {
773 spin_unlock_bh(&net->sctp.addr_wq_lock);
774 return;
775 }
776 addrw->state = cmd;
777 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
778
779 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
780 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
781
782 if (!timer_pending(&net->sctp.addr_wq_timer)) {
783 timeo_val = jiffies;
784 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
785 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
786 }
787 spin_unlock_bh(&net->sctp.addr_wq_lock);
788}
789
790/* Event handler for inet address addition/deletion events.
791 * The sctp_local_addr_list needs to be protocted by a spin lock since
792 * multiple notifiers (say IPv4 and IPv6) may be running at the same
793 * time and thus corrupt the list.
794 * The reader side is protected with RCU.
795 */
796static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
797 void *ptr)
798{
799 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
800 struct sctp_sockaddr_entry *addr = NULL;
801 struct sctp_sockaddr_entry *temp;
802 struct net *net = dev_net(ifa->ifa_dev->dev);
803 int found = 0;
804
805 switch (ev) {
806 case NETDEV_UP:
807 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
808 if (addr) {
809 addr->a.v4.sin_family = AF_INET;
810 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
811 addr->valid = 1;
812 spin_lock_bh(&net->sctp.local_addr_lock);
813 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
814 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
815 spin_unlock_bh(&net->sctp.local_addr_lock);
816 }
817 break;
818 case NETDEV_DOWN:
819 spin_lock_bh(&net->sctp.local_addr_lock);
820 list_for_each_entry_safe(addr, temp,
821 &net->sctp.local_addr_list, list) {
822 if (addr->a.sa.sa_family == AF_INET &&
823 addr->a.v4.sin_addr.s_addr ==
824 ifa->ifa_local) {
825 found = 1;
826 addr->valid = 0;
827 list_del_rcu(&addr->list);
828 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
829 break;
830 }
831 }
832 spin_unlock_bh(&net->sctp.local_addr_lock);
833 if (found)
834 kfree_rcu(addr, rcu);
835 break;
836 }
837
838 return NOTIFY_DONE;
839}
840
841/*
842 * Initialize the control inode/socket with a control endpoint data
843 * structure. This endpoint is reserved exclusively for the OOTB processing.
844 */
845static int sctp_ctl_sock_init(struct net *net)
846{
847 int err;
848 sa_family_t family = PF_INET;
849
850 if (sctp_get_pf_specific(PF_INET6))
851 family = PF_INET6;
852
853 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
854 SOCK_SEQPACKET, IPPROTO_SCTP, net);
855
856 /* If IPv6 socket could not be created, try the IPv4 socket */
857 if (err < 0 && family == PF_INET6)
858 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
859 SOCK_SEQPACKET, IPPROTO_SCTP,
860 net);
861
862 if (err < 0) {
863 pr_err("Failed to create the SCTP control socket\n");
864 return err;
865 }
866 return 0;
867}
868
869static int sctp_udp_rcv(struct sock *sk, struct sk_buff *skb)
870{
871 SCTP_INPUT_CB(skb)->encap_port = udp_hdr(skb)->source;
872
873 skb_set_transport_header(skb, sizeof(struct udphdr));
874 sctp_rcv(skb);
875 return 0;
876}
877
878int sctp_udp_sock_start(struct net *net)
879{
880 struct udp_tunnel_sock_cfg tuncfg = {NULL};
881 struct udp_port_cfg udp_conf = {0};
882 struct socket *sock;
883 int err;
884
885 udp_conf.family = AF_INET;
886 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
887 udp_conf.local_udp_port = htons(net->sctp.udp_port);
888 err = udp_sock_create(net, &udp_conf, &sock);
889 if (err) {
890 pr_err("Failed to create the SCTP UDP tunneling v4 sock\n");
891 return err;
892 }
893
894 tuncfg.encap_type = 1;
895 tuncfg.encap_rcv = sctp_udp_rcv;
896 tuncfg.encap_err_lookup = sctp_udp_v4_err;
897 setup_udp_tunnel_sock(net, sock, &tuncfg);
898 net->sctp.udp4_sock = sock->sk;
899
900#if IS_ENABLED(CONFIG_IPV6)
901 memset(&udp_conf, 0, sizeof(udp_conf));
902
903 udp_conf.family = AF_INET6;
904 udp_conf.local_ip6 = in6addr_any;
905 udp_conf.local_udp_port = htons(net->sctp.udp_port);
906 udp_conf.use_udp6_rx_checksums = true;
907 udp_conf.ipv6_v6only = true;
908 err = udp_sock_create(net, &udp_conf, &sock);
909 if (err) {
910 pr_err("Failed to create the SCTP UDP tunneling v6 sock\n");
911 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket);
912 net->sctp.udp4_sock = NULL;
913 return err;
914 }
915
916 tuncfg.encap_type = 1;
917 tuncfg.encap_rcv = sctp_udp_rcv;
918 tuncfg.encap_err_lookup = sctp_udp_v6_err;
919 setup_udp_tunnel_sock(net, sock, &tuncfg);
920 net->sctp.udp6_sock = sock->sk;
921#endif
922
923 return 0;
924}
925
926void sctp_udp_sock_stop(struct net *net)
927{
928 if (net->sctp.udp4_sock) {
929 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket);
930 net->sctp.udp4_sock = NULL;
931 }
932 if (net->sctp.udp6_sock) {
933 udp_tunnel_sock_release(net->sctp.udp6_sock->sk_socket);
934 net->sctp.udp6_sock = NULL;
935 }
936}
937
938/* Register address family specific functions. */
939int sctp_register_af(struct sctp_af *af)
940{
941 switch (af->sa_family) {
942 case AF_INET:
943 if (sctp_af_v4_specific)
944 return 0;
945 sctp_af_v4_specific = af;
946 break;
947 case AF_INET6:
948 if (sctp_af_v6_specific)
949 return 0;
950 sctp_af_v6_specific = af;
951 break;
952 default:
953 return 0;
954 }
955
956 INIT_LIST_HEAD(&af->list);
957 list_add_tail(&af->list, &sctp_address_families);
958 return 1;
959}
960
961/* Get the table of functions for manipulating a particular address
962 * family.
963 */
964struct sctp_af *sctp_get_af_specific(sa_family_t family)
965{
966 switch (family) {
967 case AF_INET:
968 return sctp_af_v4_specific;
969 case AF_INET6:
970 return sctp_af_v6_specific;
971 default:
972 return NULL;
973 }
974}
975
976/* Common code to initialize a AF_INET msg_name. */
977static void sctp_inet_msgname(char *msgname, int *addr_len)
978{
979 struct sockaddr_in *sin;
980
981 sin = (struct sockaddr_in *)msgname;
982 *addr_len = sizeof(struct sockaddr_in);
983 sin->sin_family = AF_INET;
984 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
985}
986
987/* Copy the primary address of the peer primary address as the msg_name. */
988static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
989 int *addr_len)
990{
991 struct sockaddr_in *sin, *sinfrom;
992
993 if (msgname) {
994 struct sctp_association *asoc;
995
996 asoc = event->asoc;
997 sctp_inet_msgname(msgname, addr_len);
998 sin = (struct sockaddr_in *)msgname;
999 sinfrom = &asoc->peer.primary_addr.v4;
1000 sin->sin_port = htons(asoc->peer.port);
1001 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
1002 }
1003}
1004
1005/* Initialize and copy out a msgname from an inbound skb. */
1006static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
1007{
1008 if (msgname) {
1009 struct sctphdr *sh = sctp_hdr(skb);
1010 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
1011
1012 sctp_inet_msgname(msgname, len);
1013 sin->sin_port = sh->source;
1014 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1015 }
1016}
1017
1018/* Do we support this AF? */
1019static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
1020{
1021 /* PF_INET only supports AF_INET addresses. */
1022 return AF_INET == family;
1023}
1024
1025/* Address matching with wildcards allowed. */
1026static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
1027 const union sctp_addr *addr2,
1028 struct sctp_sock *opt)
1029{
1030 /* PF_INET only supports AF_INET addresses. */
1031 if (addr1->sa.sa_family != addr2->sa.sa_family)
1032 return 0;
1033 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
1034 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
1035 return 1;
1036 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
1037 return 1;
1038
1039 return 0;
1040}
1041
1042/* Verify that provided sockaddr looks bindable. Common verification has
1043 * already been taken care of.
1044 */
1045static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
1046{
1047 return sctp_v4_available(addr, opt);
1048}
1049
1050/* Verify that sockaddr looks sendable. Common verification has already
1051 * been taken care of.
1052 */
1053static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
1054{
1055 return 1;
1056}
1057
1058/* Fill in Supported Address Type information for INIT and INIT-ACK
1059 * chunks. Returns number of addresses supported.
1060 */
1061static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
1062 __be16 *types)
1063{
1064 types[0] = SCTP_PARAM_IPV4_ADDRESS;
1065 return 1;
1066}
1067
1068/* Wrapper routine that calls the ip transmit routine. */
1069static inline int sctp_v4_xmit(struct sk_buff *skb, struct sctp_transport *t)
1070{
1071 struct dst_entry *dst = dst_clone(t->dst);
1072 struct flowi4 *fl4 = &t->fl.u.ip4;
1073 struct sock *sk = skb->sk;
1074 struct inet_sock *inet = inet_sk(sk);
1075 __u8 dscp = READ_ONCE(inet->tos);
1076 __be16 df = 0;
1077
1078 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
1079 skb->len, &fl4->saddr, &fl4->daddr);
1080
1081 if (t->dscp & SCTP_DSCP_SET_MASK)
1082 dscp = t->dscp & SCTP_DSCP_VAL_MASK;
1083
1084 inet->pmtudisc = t->param_flags & SPP_PMTUD_ENABLE ? IP_PMTUDISC_DO
1085 : IP_PMTUDISC_DONT;
1086 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
1087
1088 if (!t->encap_port || !sctp_sk(sk)->udp_port) {
1089 skb_dst_set(skb, dst);
1090 return __ip_queue_xmit(sk, skb, &t->fl, dscp);
1091 }
1092
1093 if (skb_is_gso(skb))
1094 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
1095
1096 if (ip_dont_fragment(sk, dst) && !skb->ignore_df)
1097 df = htons(IP_DF);
1098
1099 skb->encapsulation = 1;
1100 skb_reset_inner_mac_header(skb);
1101 skb_reset_inner_transport_header(skb);
1102 skb_set_inner_ipproto(skb, IPPROTO_SCTP);
1103 udp_tunnel_xmit_skb(dst_rtable(dst), sk, skb, fl4->saddr,
1104 fl4->daddr, dscp, ip4_dst_hoplimit(dst), df,
1105 sctp_sk(sk)->udp_port, t->encap_port, false, false);
1106 return 0;
1107}
1108
1109static struct sctp_af sctp_af_inet;
1110
1111static struct sctp_pf sctp_pf_inet = {
1112 .event_msgname = sctp_inet_event_msgname,
1113 .skb_msgname = sctp_inet_skb_msgname,
1114 .af_supported = sctp_inet_af_supported,
1115 .cmp_addr = sctp_inet_cmp_addr,
1116 .bind_verify = sctp_inet_bind_verify,
1117 .send_verify = sctp_inet_send_verify,
1118 .supported_addrs = sctp_inet_supported_addrs,
1119 .create_accept_sk = sctp_v4_create_accept_sk,
1120 .addr_to_user = sctp_v4_addr_to_user,
1121 .to_sk_saddr = sctp_v4_to_sk_saddr,
1122 .to_sk_daddr = sctp_v4_to_sk_daddr,
1123 .copy_ip_options = sctp_v4_copy_ip_options,
1124 .af = &sctp_af_inet
1125};
1126
1127/* Notifier for inetaddr addition/deletion events. */
1128static struct notifier_block sctp_inetaddr_notifier = {
1129 .notifier_call = sctp_inetaddr_event,
1130};
1131
1132/* Socket operations. */
1133static const struct proto_ops inet_seqpacket_ops = {
1134 .family = PF_INET,
1135 .owner = THIS_MODULE,
1136 .release = inet_release, /* Needs to be wrapped... */
1137 .bind = inet_bind,
1138 .connect = sctp_inet_connect,
1139 .socketpair = sock_no_socketpair,
1140 .accept = inet_accept,
1141 .getname = inet_getname, /* Semantics are different. */
1142 .poll = sctp_poll,
1143 .ioctl = inet_ioctl,
1144 .gettstamp = sock_gettstamp,
1145 .listen = sctp_inet_listen,
1146 .shutdown = inet_shutdown, /* Looks harmless. */
1147 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1148 .getsockopt = sock_common_getsockopt,
1149 .sendmsg = inet_sendmsg,
1150 .recvmsg = inet_recvmsg,
1151 .mmap = sock_no_mmap,
1152};
1153
1154/* Registration with AF_INET family. */
1155static struct inet_protosw sctp_seqpacket_protosw = {
1156 .type = SOCK_SEQPACKET,
1157 .protocol = IPPROTO_SCTP,
1158 .prot = &sctp_prot,
1159 .ops = &inet_seqpacket_ops,
1160 .flags = SCTP_PROTOSW_FLAG
1161};
1162static struct inet_protosw sctp_stream_protosw = {
1163 .type = SOCK_STREAM,
1164 .protocol = IPPROTO_SCTP,
1165 .prot = &sctp_prot,
1166 .ops = &inet_seqpacket_ops,
1167 .flags = SCTP_PROTOSW_FLAG
1168};
1169
1170static int sctp4_rcv(struct sk_buff *skb)
1171{
1172 SCTP_INPUT_CB(skb)->encap_port = 0;
1173 return sctp_rcv(skb);
1174}
1175
1176/* Register with IP layer. */
1177static const struct net_protocol sctp_protocol = {
1178 .handler = sctp4_rcv,
1179 .err_handler = sctp_v4_err,
1180 .no_policy = 1,
1181 .icmp_strict_tag_validation = 1,
1182};
1183
1184/* IPv4 address related functions. */
1185static struct sctp_af sctp_af_inet = {
1186 .sa_family = AF_INET,
1187 .sctp_xmit = sctp_v4_xmit,
1188 .setsockopt = ip_setsockopt,
1189 .getsockopt = ip_getsockopt,
1190 .get_dst = sctp_v4_get_dst,
1191 .get_saddr = sctp_v4_get_saddr,
1192 .copy_addrlist = sctp_v4_copy_addrlist,
1193 .from_skb = sctp_v4_from_skb,
1194 .from_sk = sctp_v4_from_sk,
1195 .from_addr_param = sctp_v4_from_addr_param,
1196 .to_addr_param = sctp_v4_to_addr_param,
1197 .cmp_addr = sctp_v4_cmp_addr,
1198 .addr_valid = sctp_v4_addr_valid,
1199 .inaddr_any = sctp_v4_inaddr_any,
1200 .is_any = sctp_v4_is_any,
1201 .available = sctp_v4_available,
1202 .scope = sctp_v4_scope,
1203 .skb_iif = sctp_v4_skb_iif,
1204 .skb_sdif = sctp_v4_skb_sdif,
1205 .is_ce = sctp_v4_is_ce,
1206 .seq_dump_addr = sctp_v4_seq_dump_addr,
1207 .ecn_capable = sctp_v4_ecn_capable,
1208 .net_header_len = sizeof(struct iphdr),
1209 .sockaddr_len = sizeof(struct sockaddr_in),
1210 .ip_options_len = sctp_v4_ip_options_len,
1211};
1212
1213struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1214{
1215 switch (family) {
1216 case PF_INET:
1217 return sctp_pf_inet_specific;
1218 case PF_INET6:
1219 return sctp_pf_inet6_specific;
1220 default:
1221 return NULL;
1222 }
1223}
1224
1225/* Register the PF specific function table. */
1226int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1227{
1228 switch (family) {
1229 case PF_INET:
1230 if (sctp_pf_inet_specific)
1231 return 0;
1232 sctp_pf_inet_specific = pf;
1233 break;
1234 case PF_INET6:
1235 if (sctp_pf_inet6_specific)
1236 return 0;
1237 sctp_pf_inet6_specific = pf;
1238 break;
1239 default:
1240 return 0;
1241 }
1242 return 1;
1243}
1244
1245static inline int init_sctp_mibs(struct net *net)
1246{
1247 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1248 if (!net->sctp.sctp_statistics)
1249 return -ENOMEM;
1250 return 0;
1251}
1252
1253static inline void cleanup_sctp_mibs(struct net *net)
1254{
1255 free_percpu(net->sctp.sctp_statistics);
1256}
1257
1258static void sctp_v4_pf_init(void)
1259{
1260 /* Initialize the SCTP specific PF functions. */
1261 sctp_register_pf(&sctp_pf_inet, PF_INET);
1262 sctp_register_af(&sctp_af_inet);
1263}
1264
1265static void sctp_v4_pf_exit(void)
1266{
1267 list_del(&sctp_af_inet.list);
1268}
1269
1270static int sctp_v4_protosw_init(void)
1271{
1272 int rc;
1273
1274 rc = proto_register(&sctp_prot, 1);
1275 if (rc)
1276 return rc;
1277
1278 /* Register SCTP(UDP and TCP style) with socket layer. */
1279 inet_register_protosw(&sctp_seqpacket_protosw);
1280 inet_register_protosw(&sctp_stream_protosw);
1281
1282 return 0;
1283}
1284
1285static void sctp_v4_protosw_exit(void)
1286{
1287 inet_unregister_protosw(&sctp_stream_protosw);
1288 inet_unregister_protosw(&sctp_seqpacket_protosw);
1289 proto_unregister(&sctp_prot);
1290}
1291
1292static int sctp_v4_add_protocol(void)
1293{
1294 /* Register notifier for inet address additions/deletions. */
1295 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1296
1297 /* Register SCTP with inet layer. */
1298 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1299 return -EAGAIN;
1300
1301 return 0;
1302}
1303
1304static void sctp_v4_del_protocol(void)
1305{
1306 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1307 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1308}
1309
1310static int __net_init sctp_defaults_init(struct net *net)
1311{
1312 int status;
1313
1314 /*
1315 * 14. Suggested SCTP Protocol Parameter Values
1316 */
1317 /* The following protocol parameters are RECOMMENDED: */
1318 /* RTO.Initial - 3 seconds */
1319 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1320 /* RTO.Min - 1 second */
1321 net->sctp.rto_min = SCTP_RTO_MIN;
1322 /* RTO.Max - 60 seconds */
1323 net->sctp.rto_max = SCTP_RTO_MAX;
1324 /* RTO.Alpha - 1/8 */
1325 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1326 /* RTO.Beta - 1/4 */
1327 net->sctp.rto_beta = SCTP_RTO_BETA;
1328
1329 /* Valid.Cookie.Life - 60 seconds */
1330 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1331
1332 /* Whether Cookie Preservative is enabled(1) or not(0) */
1333 net->sctp.cookie_preserve_enable = 1;
1334
1335 /* Default sctp sockets to use md5 as their hmac alg */
1336#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1337 net->sctp.sctp_hmac_alg = "md5";
1338#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1339 net->sctp.sctp_hmac_alg = "sha1";
1340#else
1341 net->sctp.sctp_hmac_alg = NULL;
1342#endif
1343
1344 /* Max.Burst - 4 */
1345 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1346
1347 /* Disable of Primary Path Switchover by default */
1348 net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX;
1349
1350 /* Enable pf state by default */
1351 net->sctp.pf_enable = 1;
1352
1353 /* Ignore pf exposure feature by default */
1354 net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET;
1355
1356 /* Association.Max.Retrans - 10 attempts
1357 * Path.Max.Retrans - 5 attempts (per destination address)
1358 * Max.Init.Retransmits - 8 attempts
1359 */
1360 net->sctp.max_retrans_association = 10;
1361 net->sctp.max_retrans_path = 5;
1362 net->sctp.max_retrans_init = 8;
1363
1364 /* Sendbuffer growth - do per-socket accounting */
1365 net->sctp.sndbuf_policy = 0;
1366
1367 /* Rcvbuffer growth - do per-socket accounting */
1368 net->sctp.rcvbuf_policy = 0;
1369
1370 /* HB.interval - 30 seconds */
1371 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1372
1373 /* delayed SACK timeout */
1374 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1375
1376 /* Disable ADDIP by default. */
1377 net->sctp.addip_enable = 0;
1378 net->sctp.addip_noauth = 0;
1379 net->sctp.default_auto_asconf = 0;
1380
1381 /* Enable PR-SCTP by default. */
1382 net->sctp.prsctp_enable = 1;
1383
1384 /* Disable RECONF by default. */
1385 net->sctp.reconf_enable = 0;
1386
1387 /* Disable AUTH by default. */
1388 net->sctp.auth_enable = 0;
1389
1390 /* Enable ECN by default. */
1391 net->sctp.ecn_enable = 1;
1392
1393 /* Set UDP tunneling listening port to 0 by default */
1394 net->sctp.udp_port = 0;
1395
1396 /* Set remote encap port to 0 by default */
1397 net->sctp.encap_port = 0;
1398
1399 /* Set SCOPE policy to enabled */
1400 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1401
1402 /* Set the default rwnd update threshold */
1403 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1404
1405 /* Initialize maximum autoclose timeout. */
1406 net->sctp.max_autoclose = INT_MAX / HZ;
1407
1408#ifdef CONFIG_NET_L3_MASTER_DEV
1409 net->sctp.l3mdev_accept = 1;
1410#endif
1411
1412 status = sctp_sysctl_net_register(net);
1413 if (status)
1414 goto err_sysctl_register;
1415
1416 /* Allocate and initialise sctp mibs. */
1417 status = init_sctp_mibs(net);
1418 if (status)
1419 goto err_init_mibs;
1420
1421#ifdef CONFIG_PROC_FS
1422 /* Initialize proc fs directory. */
1423 status = sctp_proc_init(net);
1424 if (status)
1425 goto err_init_proc;
1426#endif
1427
1428 sctp_dbg_objcnt_init(net);
1429
1430 /* Initialize the local address list. */
1431 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1432 spin_lock_init(&net->sctp.local_addr_lock);
1433 sctp_get_local_addr_list(net);
1434
1435 /* Initialize the address event list */
1436 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1437 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1438 spin_lock_init(&net->sctp.addr_wq_lock);
1439 net->sctp.addr_wq_timer.expires = 0;
1440 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1441
1442 return 0;
1443
1444#ifdef CONFIG_PROC_FS
1445err_init_proc:
1446 cleanup_sctp_mibs(net);
1447#endif
1448err_init_mibs:
1449 sctp_sysctl_net_unregister(net);
1450err_sysctl_register:
1451 return status;
1452}
1453
1454static void __net_exit sctp_defaults_exit(struct net *net)
1455{
1456 /* Free the local address list */
1457 sctp_free_addr_wq(net);
1458 sctp_free_local_addr_list(net);
1459
1460#ifdef CONFIG_PROC_FS
1461 remove_proc_subtree("sctp", net->proc_net);
1462 net->sctp.proc_net_sctp = NULL;
1463#endif
1464 cleanup_sctp_mibs(net);
1465 sctp_sysctl_net_unregister(net);
1466}
1467
1468static struct pernet_operations sctp_defaults_ops = {
1469 .init = sctp_defaults_init,
1470 .exit = sctp_defaults_exit,
1471};
1472
1473static int __net_init sctp_ctrlsock_init(struct net *net)
1474{
1475 int status;
1476
1477 /* Initialize the control inode/socket for handling OOTB packets. */
1478 status = sctp_ctl_sock_init(net);
1479 if (status)
1480 pr_err("Failed to initialize the SCTP control sock\n");
1481
1482 return status;
1483}
1484
1485static void __net_exit sctp_ctrlsock_exit(struct net *net)
1486{
1487 /* Free the control endpoint. */
1488 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1489}
1490
1491static struct pernet_operations sctp_ctrlsock_ops = {
1492 .init = sctp_ctrlsock_init,
1493 .exit = sctp_ctrlsock_exit,
1494};
1495
1496/* Initialize the universe into something sensible. */
1497static __init int sctp_init(void)
1498{
1499 unsigned long nr_pages = totalram_pages();
1500 unsigned long limit;
1501 unsigned long goal;
1502 int max_entry_order;
1503 int num_entries;
1504 int max_share;
1505 int status;
1506 int order;
1507 int i;
1508
1509 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1510
1511 /* Allocate bind_bucket and chunk caches. */
1512 status = -ENOBUFS;
1513 sctp_bucket_cachep = KMEM_CACHE(sctp_bind_bucket, SLAB_HWCACHE_ALIGN);
1514 if (!sctp_bucket_cachep)
1515 goto out;
1516
1517 sctp_chunk_cachep = KMEM_CACHE(sctp_chunk, SLAB_HWCACHE_ALIGN);
1518 if (!sctp_chunk_cachep)
1519 goto err_chunk_cachep;
1520
1521 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1522 if (status)
1523 goto err_percpu_counter_init;
1524
1525 /* Implementation specific variables. */
1526
1527 /* Initialize default stream count setup information. */
1528 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1529 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1530
1531 /* Initialize handle used for association ids. */
1532 idr_init(&sctp_assocs_id);
1533
1534 limit = nr_free_buffer_pages() / 8;
1535 limit = max(limit, 128UL);
1536 sysctl_sctp_mem[0] = limit / 4 * 3;
1537 sysctl_sctp_mem[1] = limit;
1538 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1539
1540 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1541 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1542 max_share = min(4UL*1024*1024, limit);
1543
1544 sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */
1545 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1546 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1547
1548 sysctl_sctp_wmem[0] = PAGE_SIZE;
1549 sysctl_sctp_wmem[1] = 16*1024;
1550 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1551
1552 /* Size and allocate the association hash table.
1553 * The methodology is similar to that of the tcp hash tables.
1554 * Though not identical. Start by getting a goal size
1555 */
1556 if (nr_pages >= (128 * 1024))
1557 goal = nr_pages >> (22 - PAGE_SHIFT);
1558 else
1559 goal = nr_pages >> (24 - PAGE_SHIFT);
1560
1561 /* Then compute the page order for said goal */
1562 order = get_order(goal);
1563
1564 /* Now compute the required page order for the maximum sized table we
1565 * want to create
1566 */
1567 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1568 sizeof(struct sctp_bind_hashbucket));
1569
1570 /* Limit the page order by that maximum hash table size */
1571 order = min(order, max_entry_order);
1572
1573 /* Allocate and initialize the endpoint hash table. */
1574 sctp_ep_hashsize = 64;
1575 sctp_ep_hashtable =
1576 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1577 if (!sctp_ep_hashtable) {
1578 pr_err("Failed endpoint_hash alloc\n");
1579 status = -ENOMEM;
1580 goto err_ehash_alloc;
1581 }
1582 for (i = 0; i < sctp_ep_hashsize; i++) {
1583 rwlock_init(&sctp_ep_hashtable[i].lock);
1584 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1585 }
1586
1587 /* Allocate and initialize the SCTP port hash table.
1588 * Note that order is initalized to start at the max sized
1589 * table we want to support. If we can't get that many pages
1590 * reduce the order and try again
1591 */
1592 do {
1593 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1594 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1595 } while (!sctp_port_hashtable && --order > 0);
1596
1597 if (!sctp_port_hashtable) {
1598 pr_err("Failed bind hash alloc\n");
1599 status = -ENOMEM;
1600 goto err_bhash_alloc;
1601 }
1602
1603 /* Now compute the number of entries that will fit in the
1604 * port hash space we allocated
1605 */
1606 num_entries = (1UL << order) * PAGE_SIZE /
1607 sizeof(struct sctp_bind_hashbucket);
1608
1609 /* And finish by rounding it down to the nearest power of two.
1610 * This wastes some memory of course, but it's needed because
1611 * the hash function operates based on the assumption that
1612 * the number of entries is a power of two.
1613 */
1614 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1615
1616 for (i = 0; i < sctp_port_hashsize; i++) {
1617 spin_lock_init(&sctp_port_hashtable[i].lock);
1618 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1619 }
1620
1621 status = sctp_transport_hashtable_init();
1622 if (status)
1623 goto err_thash_alloc;
1624
1625 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1626 num_entries);
1627
1628 sctp_sysctl_register();
1629
1630 INIT_LIST_HEAD(&sctp_address_families);
1631 sctp_v4_pf_init();
1632 sctp_v6_pf_init();
1633 sctp_sched_ops_init();
1634
1635 status = register_pernet_subsys(&sctp_defaults_ops);
1636 if (status)
1637 goto err_register_defaults;
1638
1639 status = sctp_v4_protosw_init();
1640 if (status)
1641 goto err_protosw_init;
1642
1643 status = sctp_v6_protosw_init();
1644 if (status)
1645 goto err_v6_protosw_init;
1646
1647 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1648 if (status)
1649 goto err_register_ctrlsock;
1650
1651 status = sctp_v4_add_protocol();
1652 if (status)
1653 goto err_add_protocol;
1654
1655 /* Register SCTP with inet6 layer. */
1656 status = sctp_v6_add_protocol();
1657 if (status)
1658 goto err_v6_add_protocol;
1659
1660 if (sctp_offload_init() < 0)
1661 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1662
1663out:
1664 return status;
1665err_v6_add_protocol:
1666 sctp_v4_del_protocol();
1667err_add_protocol:
1668 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1669err_register_ctrlsock:
1670 sctp_v6_protosw_exit();
1671err_v6_protosw_init:
1672 sctp_v4_protosw_exit();
1673err_protosw_init:
1674 unregister_pernet_subsys(&sctp_defaults_ops);
1675err_register_defaults:
1676 sctp_v4_pf_exit();
1677 sctp_v6_pf_exit();
1678 sctp_sysctl_unregister();
1679 free_pages((unsigned long)sctp_port_hashtable,
1680 get_order(sctp_port_hashsize *
1681 sizeof(struct sctp_bind_hashbucket)));
1682err_bhash_alloc:
1683 sctp_transport_hashtable_destroy();
1684err_thash_alloc:
1685 kfree(sctp_ep_hashtable);
1686err_ehash_alloc:
1687 percpu_counter_destroy(&sctp_sockets_allocated);
1688err_percpu_counter_init:
1689 kmem_cache_destroy(sctp_chunk_cachep);
1690err_chunk_cachep:
1691 kmem_cache_destroy(sctp_bucket_cachep);
1692 goto out;
1693}
1694
1695/* Exit handler for the SCTP protocol. */
1696static __exit void sctp_exit(void)
1697{
1698 /* BUG. This should probably do something useful like clean
1699 * up all the remaining associations and all that memory.
1700 */
1701
1702 /* Unregister with inet6/inet layers. */
1703 sctp_v6_del_protocol();
1704 sctp_v4_del_protocol();
1705
1706 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1707
1708 /* Free protosw registrations */
1709 sctp_v6_protosw_exit();
1710 sctp_v4_protosw_exit();
1711
1712 unregister_pernet_subsys(&sctp_defaults_ops);
1713
1714 /* Unregister with socket layer. */
1715 sctp_v6_pf_exit();
1716 sctp_v4_pf_exit();
1717
1718 sctp_sysctl_unregister();
1719
1720 free_pages((unsigned long)sctp_port_hashtable,
1721 get_order(sctp_port_hashsize *
1722 sizeof(struct sctp_bind_hashbucket)));
1723 kfree(sctp_ep_hashtable);
1724 sctp_transport_hashtable_destroy();
1725
1726 percpu_counter_destroy(&sctp_sockets_allocated);
1727
1728 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1729
1730 kmem_cache_destroy(sctp_chunk_cachep);
1731 kmem_cache_destroy(sctp_bucket_cachep);
1732}
1733
1734module_init(sctp_init);
1735module_exit(sctp_exit);
1736
1737/*
1738 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1739 */
1740MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1741MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1742MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1743MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1744module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1745MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1746MODULE_LICENSE("GPL");
1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
9 * This file is part of the SCTP kernel implementation
10 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 *
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
47 */
48
49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
51#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
56#include <linux/bootmem.h>
57#include <linux/highmem.h>
58#include <linux/swap.h>
59#include <linux/slab.h>
60#include <net/net_namespace.h>
61#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
64#include <net/route.h>
65#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70/* Global data structures. */
71struct sctp_globals sctp_globals __read_mostly;
72DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
73
74#ifdef CONFIG_PROC_FS
75struct proc_dir_entry *proc_net_sctp;
76#endif
77
78struct idr sctp_assocs_id;
79DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81/* This is the global socket data structure used for responding to
82 * the Out-of-the-blue (OOTB) packets. A control sock will be created
83 * for this socket at the initialization time.
84 */
85static struct sock *sctp_ctl_sock;
86
87static struct sctp_pf *sctp_pf_inet6_specific;
88static struct sctp_pf *sctp_pf_inet_specific;
89static struct sctp_af *sctp_af_v4_specific;
90static struct sctp_af *sctp_af_v6_specific;
91
92struct kmem_cache *sctp_chunk_cachep __read_mostly;
93struct kmem_cache *sctp_bucket_cachep __read_mostly;
94
95long sysctl_sctp_mem[3];
96int sysctl_sctp_rmem[3];
97int sysctl_sctp_wmem[3];
98
99/* Return the address of the control sock. */
100struct sock *sctp_get_ctl_sock(void)
101{
102 return sctp_ctl_sock;
103}
104
105/* Set up the proc fs entry for the SCTP protocol. */
106static __init int sctp_proc_init(void)
107{
108 if (percpu_counter_init(&sctp_sockets_allocated, 0))
109 goto out_nomem;
110#ifdef CONFIG_PROC_FS
111 if (!proc_net_sctp) {
112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
113 if (!proc_net_sctp)
114 goto out_free_percpu;
115 }
116
117 if (sctp_snmp_proc_init())
118 goto out_snmp_proc_init;
119 if (sctp_eps_proc_init())
120 goto out_eps_proc_init;
121 if (sctp_assocs_proc_init())
122 goto out_assocs_proc_init;
123 if (sctp_remaddr_proc_init())
124 goto out_remaddr_proc_init;
125
126 return 0;
127
128out_remaddr_proc_init:
129 sctp_assocs_proc_exit();
130out_assocs_proc_init:
131 sctp_eps_proc_exit();
132out_eps_proc_init:
133 sctp_snmp_proc_exit();
134out_snmp_proc_init:
135 if (proc_net_sctp) {
136 proc_net_sctp = NULL;
137 remove_proc_entry("sctp", init_net.proc_net);
138 }
139out_free_percpu:
140 percpu_counter_destroy(&sctp_sockets_allocated);
141#else
142 return 0;
143#endif /* CONFIG_PROC_FS */
144
145out_nomem:
146 return -ENOMEM;
147}
148
149/* Clean up the proc fs entry for the SCTP protocol.
150 * Note: Do not make this __exit as it is used in the init error
151 * path.
152 */
153static void sctp_proc_exit(void)
154{
155#ifdef CONFIG_PROC_FS
156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
159 sctp_remaddr_proc_exit();
160
161 if (proc_net_sctp) {
162 proc_net_sctp = NULL;
163 remove_proc_entry("sctp", init_net.proc_net);
164 }
165#endif
166 percpu_counter_destroy(&sctp_sockets_allocated);
167}
168
169/* Private helper to extract ipv4 address and stash them in
170 * the protocol structure.
171 */
172static void sctp_v4_copy_addrlist(struct list_head *addrlist,
173 struct net_device *dev)
174{
175 struct in_device *in_dev;
176 struct in_ifaddr *ifa;
177 struct sctp_sockaddr_entry *addr;
178
179 rcu_read_lock();
180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
181 rcu_read_unlock();
182 return;
183 }
184
185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
186 /* Add the address to the local list. */
187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
188 if (addr) {
189 addr->a.v4.sin_family = AF_INET;
190 addr->a.v4.sin_port = 0;
191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
192 addr->valid = 1;
193 INIT_LIST_HEAD(&addr->list);
194 list_add_tail(&addr->list, addrlist);
195 }
196 }
197
198 rcu_read_unlock();
199}
200
201/* Extract our IP addresses from the system and stash them in the
202 * protocol structure.
203 */
204static void sctp_get_local_addr_list(void)
205{
206 struct net_device *dev;
207 struct list_head *pos;
208 struct sctp_af *af;
209
210 rcu_read_lock();
211 for_each_netdev_rcu(&init_net, dev) {
212 __list_for_each(pos, &sctp_address_families) {
213 af = list_entry(pos, struct sctp_af, list);
214 af->copy_addrlist(&sctp_local_addr_list, dev);
215 }
216 }
217 rcu_read_unlock();
218}
219
220/* Free the existing local addresses. */
221static void sctp_free_local_addr_list(void)
222{
223 struct sctp_sockaddr_entry *addr;
224 struct list_head *pos, *temp;
225
226 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
227 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
228 list_del(pos);
229 kfree(addr);
230 }
231}
232
233/* Copy the local addresses which are valid for 'scope' into 'bp'. */
234int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
235 gfp_t gfp, int copy_flags)
236{
237 struct sctp_sockaddr_entry *addr;
238 int error = 0;
239
240 rcu_read_lock();
241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
242 if (!addr->valid)
243 continue;
244 if (sctp_in_scope(&addr->a, scope)) {
245 /* Now that the address is in scope, check to see if
246 * the address type is really supported by the local
247 * sock as well as the remote peer.
248 */
249 if ((((AF_INET == addr->a.sa.sa_family) &&
250 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
251 (((AF_INET6 == addr->a.sa.sa_family) &&
252 (copy_flags & SCTP_ADDR6_ALLOWED) &&
253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
254 error = sctp_add_bind_addr(bp, &addr->a,
255 SCTP_ADDR_SRC, GFP_ATOMIC);
256 if (error)
257 goto end_copy;
258 }
259 }
260 }
261
262end_copy:
263 rcu_read_unlock();
264 return error;
265}
266
267/* Initialize a sctp_addr from in incoming skb. */
268static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
269 int is_saddr)
270{
271 void *from;
272 __be16 *port;
273 struct sctphdr *sh;
274
275 port = &addr->v4.sin_port;
276 addr->v4.sin_family = AF_INET;
277
278 sh = sctp_hdr(skb);
279 if (is_saddr) {
280 *port = sh->source;
281 from = &ip_hdr(skb)->saddr;
282 } else {
283 *port = sh->dest;
284 from = &ip_hdr(skb)->daddr;
285 }
286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
287}
288
289/* Initialize an sctp_addr from a socket. */
290static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
291{
292 addr->v4.sin_family = AF_INET;
293 addr->v4.sin_port = 0;
294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
295}
296
297/* Initialize sk->sk_rcv_saddr from sctp_addr. */
298static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
299{
300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
301}
302
303/* Initialize sk->sk_daddr from sctp_addr. */
304static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
305{
306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
307}
308
309/* Initialize a sctp_addr from an address parameter. */
310static void sctp_v4_from_addr_param(union sctp_addr *addr,
311 union sctp_addr_param *param,
312 __be16 port, int iif)
313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_port = port;
316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
317}
318
319/* Initialize an address parameter from a sctp_addr and return the length
320 * of the address parameter.
321 */
322static int sctp_v4_to_addr_param(const union sctp_addr *addr,
323 union sctp_addr_param *param)
324{
325 int length = sizeof(sctp_ipv4addr_param_t);
326
327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
328 param->v4.param_hdr.length = htons(length);
329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
330
331 return length;
332}
333
334/* Initialize a sctp_addr from a dst_entry. */
335static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
336 __be16 port)
337{
338 saddr->v4.sin_family = AF_INET;
339 saddr->v4.sin_port = port;
340 saddr->v4.sin_addr.s_addr = fl4->saddr;
341}
342
343/* Compare two addresses exactly. */
344static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
345 const union sctp_addr *addr2)
346{
347 if (addr1->sa.sa_family != addr2->sa.sa_family)
348 return 0;
349 if (addr1->v4.sin_port != addr2->v4.sin_port)
350 return 0;
351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
352 return 0;
353
354 return 1;
355}
356
357/* Initialize addr struct to INADDR_ANY. */
358static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
359{
360 addr->v4.sin_family = AF_INET;
361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
362 addr->v4.sin_port = port;
363}
364
365/* Is this a wildcard address? */
366static int sctp_v4_is_any(const union sctp_addr *addr)
367{
368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
369}
370
371/* This function checks if the address is a valid address to be used for
372 * SCTP binding.
373 *
374 * Output:
375 * Return 0 - If the address is a non-unicast or an illegal address.
376 * Return 1 - If the address is a unicast.
377 */
378static int sctp_v4_addr_valid(union sctp_addr *addr,
379 struct sctp_sock *sp,
380 const struct sk_buff *skb)
381{
382 /* IPv4 addresses not allowed */
383 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
384 return 0;
385
386 /* Is this a non-unicast address or a unusable SCTP address? */
387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
388 return 0;
389
390 /* Is this a broadcast address? */
391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
392 return 0;
393
394 return 1;
395}
396
397/* Should this be available for binding? */
398static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
399{
400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
401
402
403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
404 ret != RTN_LOCAL &&
405 !sp->inet.freebind &&
406 !sysctl_ip_nonlocal_bind)
407 return 0;
408
409 if (ipv6_only_sock(sctp_opt2sk(sp)))
410 return 0;
411
412 return 1;
413}
414
415/* Checking the loopback, private and other address scopes as defined in
416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
418 *
419 * Level 0 - unusable SCTP addresses
420 * Level 1 - loopback address
421 * Level 2 - link-local addresses
422 * Level 3 - private addresses.
423 * Level 4 - global addresses
424 * For INIT and INIT-ACK address list, let L be the level of
425 * of requested destination address, sender and receiver
426 * SHOULD include all of its addresses with level greater
427 * than or equal to L.
428 *
429 * IPv4 scoping can be controlled through sysctl option
430 * net.sctp.addr_scope_policy
431 */
432static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
433{
434 sctp_scope_t retval;
435
436 /* Check for unusable SCTP addresses. */
437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
438 retval = SCTP_SCOPE_UNUSABLE;
439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
440 retval = SCTP_SCOPE_LOOPBACK;
441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
442 retval = SCTP_SCOPE_LINK;
443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
446 retval = SCTP_SCOPE_PRIVATE;
447 } else {
448 retval = SCTP_SCOPE_GLOBAL;
449 }
450
451 return retval;
452}
453
454/* Returns a valid dst cache entry for the given source and destination ip
455 * addresses. If an association is passed, trys to get a dst entry with a
456 * source address that matches an address in the bind address list.
457 */
458static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
459 struct flowi *fl, struct sock *sk)
460{
461 struct sctp_association *asoc = t->asoc;
462 struct rtable *rt;
463 struct flowi4 *fl4 = &fl->u.ip4;
464 struct sctp_bind_addr *bp;
465 struct sctp_sockaddr_entry *laddr;
466 struct dst_entry *dst = NULL;
467 union sctp_addr *daddr = &t->ipaddr;
468 union sctp_addr dst_saddr;
469
470 memset(fl4, 0x0, sizeof(struct flowi4));
471 fl4->daddr = daddr->v4.sin_addr.s_addr;
472 fl4->fl4_dport = daddr->v4.sin_port;
473 fl4->flowi4_proto = IPPROTO_SCTP;
474 if (asoc) {
475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
477 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
478 }
479 if (saddr) {
480 fl4->saddr = saddr->v4.sin_addr.s_addr;
481 fl4->fl4_sport = saddr->v4.sin_port;
482 }
483
484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
485 __func__, &fl4->daddr, &fl4->saddr);
486
487 rt = ip_route_output_key(&init_net, fl4);
488 if (!IS_ERR(rt))
489 dst = &rt->dst;
490
491 /* If there is no association or if a source address is passed, no
492 * more validation is required.
493 */
494 if (!asoc || saddr)
495 goto out;
496
497 bp = &asoc->base.bind_addr;
498
499 if (dst) {
500 /* Walk through the bind address list and look for a bind
501 * address that matches the source address of the returned dst.
502 */
503 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
506 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
507 (laddr->state != SCTP_ADDR_SRC &&
508 !asoc->src_out_of_asoc_ok))
509 continue;
510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
511 goto out_unlock;
512 }
513 rcu_read_unlock();
514
515 /* None of the bound addresses match the source address of the
516 * dst. So release it.
517 */
518 dst_release(dst);
519 dst = NULL;
520 }
521
522 /* Walk through the bind address list and try to get a dst that
523 * matches a bind address as the source address.
524 */
525 rcu_read_lock();
526 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
527 if (!laddr->valid)
528 continue;
529 if ((laddr->state == SCTP_ADDR_SRC) &&
530 (AF_INET == laddr->a.sa.sa_family)) {
531 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
532 fl4->fl4_sport = laddr->a.v4.sin_port;
533 rt = ip_route_output_key(&init_net, fl4);
534 if (!IS_ERR(rt)) {
535 dst = &rt->dst;
536 goto out_unlock;
537 }
538 }
539 }
540
541out_unlock:
542 rcu_read_unlock();
543out:
544 t->dst = dst;
545 if (dst)
546 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
547 &fl4->daddr, &fl4->saddr);
548 else
549 SCTP_DEBUG_PRINTK("NO ROUTE\n");
550}
551
552/* For v4, the source address is cached in the route entry(dst). So no need
553 * to cache it separately and hence this is an empty routine.
554 */
555static void sctp_v4_get_saddr(struct sctp_sock *sk,
556 struct sctp_transport *t,
557 struct flowi *fl)
558{
559 union sctp_addr *saddr = &t->saddr;
560 struct rtable *rt = (struct rtable *)t->dst;
561
562 if (rt) {
563 saddr->v4.sin_family = AF_INET;
564 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
565 }
566}
567
568/* What interface did this skb arrive on? */
569static int sctp_v4_skb_iif(const struct sk_buff *skb)
570{
571 return skb_rtable(skb)->rt_iif;
572}
573
574/* Was this packet marked by Explicit Congestion Notification? */
575static int sctp_v4_is_ce(const struct sk_buff *skb)
576{
577 return INET_ECN_is_ce(ip_hdr(skb)->tos);
578}
579
580/* Create and initialize a new sk for the socket returned by accept(). */
581static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
582 struct sctp_association *asoc)
583{
584 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
585 sk->sk_prot);
586 struct inet_sock *newinet;
587
588 if (!newsk)
589 goto out;
590
591 sock_init_data(NULL, newsk);
592
593 sctp_copy_sock(newsk, sk, asoc);
594 sock_reset_flag(newsk, SOCK_ZAPPED);
595
596 newinet = inet_sk(newsk);
597
598 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
599
600 sk_refcnt_debug_inc(newsk);
601
602 if (newsk->sk_prot->init(newsk)) {
603 sk_common_release(newsk);
604 newsk = NULL;
605 }
606
607out:
608 return newsk;
609}
610
611/* Map address, empty for v4 family */
612static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
613{
614 /* Empty */
615}
616
617/* Dump the v4 addr to the seq file. */
618static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
619{
620 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
621}
622
623static void sctp_v4_ecn_capable(struct sock *sk)
624{
625 INET_ECN_xmit(sk);
626}
627
628void sctp_addr_wq_timeout_handler(unsigned long arg)
629{
630 struct sctp_sockaddr_entry *addrw, *temp;
631 struct sctp_sock *sp;
632
633 spin_lock_bh(&sctp_addr_wq_lock);
634
635 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
636 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
637 " for cmd %d at entry %p\n", &sctp_addr_waitq, &addrw->a, addrw->state,
638 addrw);
639
640#if IS_ENABLED(CONFIG_IPV6)
641 /* Now we send an ASCONF for each association */
642 /* Note. we currently don't handle link local IPv6 addressees */
643 if (addrw->a.sa.sa_family == AF_INET6) {
644 struct in6_addr *in6;
645
646 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
647 IPV6_ADDR_LINKLOCAL)
648 goto free_next;
649
650 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
651 if (ipv6_chk_addr(&init_net, in6, NULL, 0) == 0 &&
652 addrw->state == SCTP_ADDR_NEW) {
653 unsigned long timeo_val;
654
655 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
656 SCTP_ADDRESS_TICK_DELAY);
657 timeo_val = jiffies;
658 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
659 mod_timer(&sctp_addr_wq_timer, timeo_val);
660 break;
661 }
662 }
663#endif
664 list_for_each_entry(sp, &sctp_auto_asconf_splist, auto_asconf_list) {
665 struct sock *sk;
666
667 sk = sctp_opt2sk(sp);
668 /* ignore bound-specific endpoints */
669 if (!sctp_is_ep_boundall(sk))
670 continue;
671 sctp_bh_lock_sock(sk);
672 if (sctp_asconf_mgmt(sp, addrw) < 0)
673 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
674 sctp_bh_unlock_sock(sk);
675 }
676#if IS_ENABLED(CONFIG_IPV6)
677free_next:
678#endif
679 list_del(&addrw->list);
680 kfree(addrw);
681 }
682 spin_unlock_bh(&sctp_addr_wq_lock);
683}
684
685static void sctp_free_addr_wq(void)
686{
687 struct sctp_sockaddr_entry *addrw;
688 struct sctp_sockaddr_entry *temp;
689
690 spin_lock_bh(&sctp_addr_wq_lock);
691 del_timer(&sctp_addr_wq_timer);
692 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
693 list_del(&addrw->list);
694 kfree(addrw);
695 }
696 spin_unlock_bh(&sctp_addr_wq_lock);
697}
698
699/* lookup the entry for the same address in the addr_waitq
700 * sctp_addr_wq MUST be locked
701 */
702static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr)
703{
704 struct sctp_sockaddr_entry *addrw;
705
706 list_for_each_entry(addrw, &sctp_addr_waitq, list) {
707 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
708 continue;
709 if (addrw->a.sa.sa_family == AF_INET) {
710 if (addrw->a.v4.sin_addr.s_addr ==
711 addr->a.v4.sin_addr.s_addr)
712 return addrw;
713 } else if (addrw->a.sa.sa_family == AF_INET6) {
714 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
715 &addr->a.v6.sin6_addr))
716 return addrw;
717 }
718 }
719 return NULL;
720}
721
722void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd)
723{
724 struct sctp_sockaddr_entry *addrw;
725 unsigned long timeo_val;
726
727 /* first, we check if an opposite message already exist in the queue.
728 * If we found such message, it is removed.
729 * This operation is a bit stupid, but the DHCP client attaches the
730 * new address after a couple of addition and deletion of that address
731 */
732
733 spin_lock_bh(&sctp_addr_wq_lock);
734 /* Offsets existing events in addr_wq */
735 addrw = sctp_addr_wq_lookup(addr);
736 if (addrw) {
737 if (addrw->state != cmd) {
738 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
739 " in wq %p\n", addrw->state, &addrw->a,
740 &sctp_addr_waitq);
741 list_del(&addrw->list);
742 kfree(addrw);
743 }
744 spin_unlock_bh(&sctp_addr_wq_lock);
745 return;
746 }
747
748 /* OK, we have to add the new address to the wait queue */
749 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
750 if (addrw == NULL) {
751 spin_unlock_bh(&sctp_addr_wq_lock);
752 return;
753 }
754 addrw->state = cmd;
755 list_add_tail(&addrw->list, &sctp_addr_waitq);
756 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
757 " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq);
758
759 if (!timer_pending(&sctp_addr_wq_timer)) {
760 timeo_val = jiffies;
761 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
762 mod_timer(&sctp_addr_wq_timer, timeo_val);
763 }
764 spin_unlock_bh(&sctp_addr_wq_lock);
765}
766
767/* Event handler for inet address addition/deletion events.
768 * The sctp_local_addr_list needs to be protocted by a spin lock since
769 * multiple notifiers (say IPv4 and IPv6) may be running at the same
770 * time and thus corrupt the list.
771 * The reader side is protected with RCU.
772 */
773static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
774 void *ptr)
775{
776 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
777 struct sctp_sockaddr_entry *addr = NULL;
778 struct sctp_sockaddr_entry *temp;
779 int found = 0;
780
781 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
782 return NOTIFY_DONE;
783
784 switch (ev) {
785 case NETDEV_UP:
786 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
787 if (addr) {
788 addr->a.v4.sin_family = AF_INET;
789 addr->a.v4.sin_port = 0;
790 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
791 addr->valid = 1;
792 spin_lock_bh(&sctp_local_addr_lock);
793 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
794 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
795 spin_unlock_bh(&sctp_local_addr_lock);
796 }
797 break;
798 case NETDEV_DOWN:
799 spin_lock_bh(&sctp_local_addr_lock);
800 list_for_each_entry_safe(addr, temp,
801 &sctp_local_addr_list, list) {
802 if (addr->a.sa.sa_family == AF_INET &&
803 addr->a.v4.sin_addr.s_addr ==
804 ifa->ifa_local) {
805 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
806 found = 1;
807 addr->valid = 0;
808 list_del_rcu(&addr->list);
809 break;
810 }
811 }
812 spin_unlock_bh(&sctp_local_addr_lock);
813 if (found)
814 kfree_rcu(addr, rcu);
815 break;
816 }
817
818 return NOTIFY_DONE;
819}
820
821/*
822 * Initialize the control inode/socket with a control endpoint data
823 * structure. This endpoint is reserved exclusively for the OOTB processing.
824 */
825static int sctp_ctl_sock_init(void)
826{
827 int err;
828 sa_family_t family = PF_INET;
829
830 if (sctp_get_pf_specific(PF_INET6))
831 family = PF_INET6;
832
833 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
834 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
835
836 /* If IPv6 socket could not be created, try the IPv4 socket */
837 if (err < 0 && family == PF_INET6)
838 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
839 SOCK_SEQPACKET, IPPROTO_SCTP,
840 &init_net);
841
842 if (err < 0) {
843 pr_err("Failed to create the SCTP control socket\n");
844 return err;
845 }
846 return 0;
847}
848
849/* Register address family specific functions. */
850int sctp_register_af(struct sctp_af *af)
851{
852 switch (af->sa_family) {
853 case AF_INET:
854 if (sctp_af_v4_specific)
855 return 0;
856 sctp_af_v4_specific = af;
857 break;
858 case AF_INET6:
859 if (sctp_af_v6_specific)
860 return 0;
861 sctp_af_v6_specific = af;
862 break;
863 default:
864 return 0;
865 }
866
867 INIT_LIST_HEAD(&af->list);
868 list_add_tail(&af->list, &sctp_address_families);
869 return 1;
870}
871
872/* Get the table of functions for manipulating a particular address
873 * family.
874 */
875struct sctp_af *sctp_get_af_specific(sa_family_t family)
876{
877 switch (family) {
878 case AF_INET:
879 return sctp_af_v4_specific;
880 case AF_INET6:
881 return sctp_af_v6_specific;
882 default:
883 return NULL;
884 }
885}
886
887/* Common code to initialize a AF_INET msg_name. */
888static void sctp_inet_msgname(char *msgname, int *addr_len)
889{
890 struct sockaddr_in *sin;
891
892 sin = (struct sockaddr_in *)msgname;
893 *addr_len = sizeof(struct sockaddr_in);
894 sin->sin_family = AF_INET;
895 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
896}
897
898/* Copy the primary address of the peer primary address as the msg_name. */
899static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
900 int *addr_len)
901{
902 struct sockaddr_in *sin, *sinfrom;
903
904 if (msgname) {
905 struct sctp_association *asoc;
906
907 asoc = event->asoc;
908 sctp_inet_msgname(msgname, addr_len);
909 sin = (struct sockaddr_in *)msgname;
910 sinfrom = &asoc->peer.primary_addr.v4;
911 sin->sin_port = htons(asoc->peer.port);
912 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
913 }
914}
915
916/* Initialize and copy out a msgname from an inbound skb. */
917static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
918{
919 if (msgname) {
920 struct sctphdr *sh = sctp_hdr(skb);
921 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
922
923 sctp_inet_msgname(msgname, len);
924 sin->sin_port = sh->source;
925 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
926 }
927}
928
929/* Do we support this AF? */
930static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
931{
932 /* PF_INET only supports AF_INET addresses. */
933 return AF_INET == family;
934}
935
936/* Address matching with wildcards allowed. */
937static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
938 const union sctp_addr *addr2,
939 struct sctp_sock *opt)
940{
941 /* PF_INET only supports AF_INET addresses. */
942 if (addr1->sa.sa_family != addr2->sa.sa_family)
943 return 0;
944 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
945 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
946 return 1;
947 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
948 return 1;
949
950 return 0;
951}
952
953/* Verify that provided sockaddr looks bindable. Common verification has
954 * already been taken care of.
955 */
956static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
957{
958 return sctp_v4_available(addr, opt);
959}
960
961/* Verify that sockaddr looks sendable. Common verification has already
962 * been taken care of.
963 */
964static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
965{
966 return 1;
967}
968
969/* Fill in Supported Address Type information for INIT and INIT-ACK
970 * chunks. Returns number of addresses supported.
971 */
972static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
973 __be16 *types)
974{
975 types[0] = SCTP_PARAM_IPV4_ADDRESS;
976 return 1;
977}
978
979/* Wrapper routine that calls the ip transmit routine. */
980static inline int sctp_v4_xmit(struct sk_buff *skb,
981 struct sctp_transport *transport)
982{
983 struct inet_sock *inet = inet_sk(skb->sk);
984
985 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
986 __func__, skb, skb->len,
987 &transport->fl.u.ip4.saddr,
988 &transport->fl.u.ip4.daddr);
989
990 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
991 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
992
993 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
994 return ip_queue_xmit(skb, &transport->fl);
995}
996
997static struct sctp_af sctp_af_inet;
998
999static struct sctp_pf sctp_pf_inet = {
1000 .event_msgname = sctp_inet_event_msgname,
1001 .skb_msgname = sctp_inet_skb_msgname,
1002 .af_supported = sctp_inet_af_supported,
1003 .cmp_addr = sctp_inet_cmp_addr,
1004 .bind_verify = sctp_inet_bind_verify,
1005 .send_verify = sctp_inet_send_verify,
1006 .supported_addrs = sctp_inet_supported_addrs,
1007 .create_accept_sk = sctp_v4_create_accept_sk,
1008 .addr_v4map = sctp_v4_addr_v4map,
1009 .af = &sctp_af_inet
1010};
1011
1012/* Notifier for inetaddr addition/deletion events. */
1013static struct notifier_block sctp_inetaddr_notifier = {
1014 .notifier_call = sctp_inetaddr_event,
1015};
1016
1017/* Socket operations. */
1018static const struct proto_ops inet_seqpacket_ops = {
1019 .family = PF_INET,
1020 .owner = THIS_MODULE,
1021 .release = inet_release, /* Needs to be wrapped... */
1022 .bind = inet_bind,
1023 .connect = inet_dgram_connect,
1024 .socketpair = sock_no_socketpair,
1025 .accept = inet_accept,
1026 .getname = inet_getname, /* Semantics are different. */
1027 .poll = sctp_poll,
1028 .ioctl = inet_ioctl,
1029 .listen = sctp_inet_listen,
1030 .shutdown = inet_shutdown, /* Looks harmless. */
1031 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1032 .getsockopt = sock_common_getsockopt,
1033 .sendmsg = inet_sendmsg,
1034 .recvmsg = sock_common_recvmsg,
1035 .mmap = sock_no_mmap,
1036 .sendpage = sock_no_sendpage,
1037#ifdef CONFIG_COMPAT
1038 .compat_setsockopt = compat_sock_common_setsockopt,
1039 .compat_getsockopt = compat_sock_common_getsockopt,
1040#endif
1041};
1042
1043/* Registration with AF_INET family. */
1044static struct inet_protosw sctp_seqpacket_protosw = {
1045 .type = SOCK_SEQPACKET,
1046 .protocol = IPPROTO_SCTP,
1047 .prot = &sctp_prot,
1048 .ops = &inet_seqpacket_ops,
1049 .no_check = 0,
1050 .flags = SCTP_PROTOSW_FLAG
1051};
1052static struct inet_protosw sctp_stream_protosw = {
1053 .type = SOCK_STREAM,
1054 .protocol = IPPROTO_SCTP,
1055 .prot = &sctp_prot,
1056 .ops = &inet_seqpacket_ops,
1057 .no_check = 0,
1058 .flags = SCTP_PROTOSW_FLAG
1059};
1060
1061/* Register with IP layer. */
1062static const struct net_protocol sctp_protocol = {
1063 .handler = sctp_rcv,
1064 .err_handler = sctp_v4_err,
1065 .no_policy = 1,
1066};
1067
1068/* IPv4 address related functions. */
1069static struct sctp_af sctp_af_inet = {
1070 .sa_family = AF_INET,
1071 .sctp_xmit = sctp_v4_xmit,
1072 .setsockopt = ip_setsockopt,
1073 .getsockopt = ip_getsockopt,
1074 .get_dst = sctp_v4_get_dst,
1075 .get_saddr = sctp_v4_get_saddr,
1076 .copy_addrlist = sctp_v4_copy_addrlist,
1077 .from_skb = sctp_v4_from_skb,
1078 .from_sk = sctp_v4_from_sk,
1079 .to_sk_saddr = sctp_v4_to_sk_saddr,
1080 .to_sk_daddr = sctp_v4_to_sk_daddr,
1081 .from_addr_param = sctp_v4_from_addr_param,
1082 .to_addr_param = sctp_v4_to_addr_param,
1083 .cmp_addr = sctp_v4_cmp_addr,
1084 .addr_valid = sctp_v4_addr_valid,
1085 .inaddr_any = sctp_v4_inaddr_any,
1086 .is_any = sctp_v4_is_any,
1087 .available = sctp_v4_available,
1088 .scope = sctp_v4_scope,
1089 .skb_iif = sctp_v4_skb_iif,
1090 .is_ce = sctp_v4_is_ce,
1091 .seq_dump_addr = sctp_v4_seq_dump_addr,
1092 .ecn_capable = sctp_v4_ecn_capable,
1093 .net_header_len = sizeof(struct iphdr),
1094 .sockaddr_len = sizeof(struct sockaddr_in),
1095#ifdef CONFIG_COMPAT
1096 .compat_setsockopt = compat_ip_setsockopt,
1097 .compat_getsockopt = compat_ip_getsockopt,
1098#endif
1099};
1100
1101struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1102
1103 switch (family) {
1104 case PF_INET:
1105 return sctp_pf_inet_specific;
1106 case PF_INET6:
1107 return sctp_pf_inet6_specific;
1108 default:
1109 return NULL;
1110 }
1111}
1112
1113/* Register the PF specific function table. */
1114int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1115{
1116 switch (family) {
1117 case PF_INET:
1118 if (sctp_pf_inet_specific)
1119 return 0;
1120 sctp_pf_inet_specific = pf;
1121 break;
1122 case PF_INET6:
1123 if (sctp_pf_inet6_specific)
1124 return 0;
1125 sctp_pf_inet6_specific = pf;
1126 break;
1127 default:
1128 return 0;
1129 }
1130 return 1;
1131}
1132
1133static inline int init_sctp_mibs(void)
1134{
1135 return snmp_mib_init((void __percpu **)sctp_statistics,
1136 sizeof(struct sctp_mib),
1137 __alignof__(struct sctp_mib));
1138}
1139
1140static inline void cleanup_sctp_mibs(void)
1141{
1142 snmp_mib_free((void __percpu **)sctp_statistics);
1143}
1144
1145static void sctp_v4_pf_init(void)
1146{
1147 /* Initialize the SCTP specific PF functions. */
1148 sctp_register_pf(&sctp_pf_inet, PF_INET);
1149 sctp_register_af(&sctp_af_inet);
1150}
1151
1152static void sctp_v4_pf_exit(void)
1153{
1154 list_del(&sctp_af_inet.list);
1155}
1156
1157static int sctp_v4_protosw_init(void)
1158{
1159 int rc;
1160
1161 rc = proto_register(&sctp_prot, 1);
1162 if (rc)
1163 return rc;
1164
1165 /* Register SCTP(UDP and TCP style) with socket layer. */
1166 inet_register_protosw(&sctp_seqpacket_protosw);
1167 inet_register_protosw(&sctp_stream_protosw);
1168
1169 return 0;
1170}
1171
1172static void sctp_v4_protosw_exit(void)
1173{
1174 inet_unregister_protosw(&sctp_stream_protosw);
1175 inet_unregister_protosw(&sctp_seqpacket_protosw);
1176 proto_unregister(&sctp_prot);
1177}
1178
1179static int sctp_v4_add_protocol(void)
1180{
1181 /* Register notifier for inet address additions/deletions. */
1182 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1183
1184 /* Register SCTP with inet layer. */
1185 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1186 return -EAGAIN;
1187
1188 return 0;
1189}
1190
1191static void sctp_v4_del_protocol(void)
1192{
1193 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1194 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1195}
1196
1197/* Initialize the universe into something sensible. */
1198SCTP_STATIC __init int sctp_init(void)
1199{
1200 int i;
1201 int status = -EINVAL;
1202 unsigned long goal;
1203 unsigned long limit;
1204 int max_share;
1205 int order;
1206
1207 /* SCTP_DEBUG sanity check. */
1208 if (!sctp_sanity_check())
1209 goto out;
1210
1211 /* Allocate bind_bucket and chunk caches. */
1212 status = -ENOBUFS;
1213 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1214 sizeof(struct sctp_bind_bucket),
1215 0, SLAB_HWCACHE_ALIGN,
1216 NULL);
1217 if (!sctp_bucket_cachep)
1218 goto out;
1219
1220 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1221 sizeof(struct sctp_chunk),
1222 0, SLAB_HWCACHE_ALIGN,
1223 NULL);
1224 if (!sctp_chunk_cachep)
1225 goto err_chunk_cachep;
1226
1227 /* Allocate and initialise sctp mibs. */
1228 status = init_sctp_mibs();
1229 if (status)
1230 goto err_init_mibs;
1231
1232 /* Initialize proc fs directory. */
1233 status = sctp_proc_init();
1234 if (status)
1235 goto err_init_proc;
1236
1237 /* Initialize object count debugging. */
1238 sctp_dbg_objcnt_init();
1239
1240 /*
1241 * 14. Suggested SCTP Protocol Parameter Values
1242 */
1243 /* The following protocol parameters are RECOMMENDED: */
1244 /* RTO.Initial - 3 seconds */
1245 sctp_rto_initial = SCTP_RTO_INITIAL;
1246 /* RTO.Min - 1 second */
1247 sctp_rto_min = SCTP_RTO_MIN;
1248 /* RTO.Max - 60 seconds */
1249 sctp_rto_max = SCTP_RTO_MAX;
1250 /* RTO.Alpha - 1/8 */
1251 sctp_rto_alpha = SCTP_RTO_ALPHA;
1252 /* RTO.Beta - 1/4 */
1253 sctp_rto_beta = SCTP_RTO_BETA;
1254
1255 /* Valid.Cookie.Life - 60 seconds */
1256 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1257
1258 /* Whether Cookie Preservative is enabled(1) or not(0) */
1259 sctp_cookie_preserve_enable = 1;
1260
1261 /* Max.Burst - 4 */
1262 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
1263
1264 /* Association.Max.Retrans - 10 attempts
1265 * Path.Max.Retrans - 5 attempts (per destination address)
1266 * Max.Init.Retransmits - 8 attempts
1267 */
1268 sctp_max_retrans_association = 10;
1269 sctp_max_retrans_path = 5;
1270 sctp_max_retrans_init = 8;
1271
1272 /* Sendbuffer growth - do per-socket accounting */
1273 sctp_sndbuf_policy = 0;
1274
1275 /* Rcvbuffer growth - do per-socket accounting */
1276 sctp_rcvbuf_policy = 0;
1277
1278 /* HB.interval - 30 seconds */
1279 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1280
1281 /* delayed SACK timeout */
1282 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1283
1284 /* Implementation specific variables. */
1285
1286 /* Initialize default stream count setup information. */
1287 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1288 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1289
1290 /* Initialize maximum autoclose timeout. */
1291 sctp_max_autoclose = INT_MAX / HZ;
1292
1293 /* Initialize handle used for association ids. */
1294 idr_init(&sctp_assocs_id);
1295
1296 limit = nr_free_buffer_pages() / 8;
1297 limit = max(limit, 128UL);
1298 sysctl_sctp_mem[0] = limit / 4 * 3;
1299 sysctl_sctp_mem[1] = limit;
1300 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1301
1302 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1303 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1304 max_share = min(4UL*1024*1024, limit);
1305
1306 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1307 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1308 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1309
1310 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1311 sysctl_sctp_wmem[1] = 16*1024;
1312 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1313
1314 /* Size and allocate the association hash table.
1315 * The methodology is similar to that of the tcp hash tables.
1316 */
1317 if (totalram_pages >= (128 * 1024))
1318 goal = totalram_pages >> (22 - PAGE_SHIFT);
1319 else
1320 goal = totalram_pages >> (24 - PAGE_SHIFT);
1321
1322 for (order = 0; (1UL << order) < goal; order++)
1323 ;
1324
1325 do {
1326 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1327 sizeof(struct sctp_hashbucket);
1328 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1329 continue;
1330 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1331 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1332 } while (!sctp_assoc_hashtable && --order > 0);
1333 if (!sctp_assoc_hashtable) {
1334 pr_err("Failed association hash alloc\n");
1335 status = -ENOMEM;
1336 goto err_ahash_alloc;
1337 }
1338 for (i = 0; i < sctp_assoc_hashsize; i++) {
1339 rwlock_init(&sctp_assoc_hashtable[i].lock);
1340 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1341 }
1342
1343 /* Allocate and initialize the endpoint hash table. */
1344 sctp_ep_hashsize = 64;
1345 sctp_ep_hashtable = (struct sctp_hashbucket *)
1346 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1347 if (!sctp_ep_hashtable) {
1348 pr_err("Failed endpoint_hash alloc\n");
1349 status = -ENOMEM;
1350 goto err_ehash_alloc;
1351 }
1352 for (i = 0; i < sctp_ep_hashsize; i++) {
1353 rwlock_init(&sctp_ep_hashtable[i].lock);
1354 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1355 }
1356
1357 /* Allocate and initialize the SCTP port hash table. */
1358 do {
1359 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1360 sizeof(struct sctp_bind_hashbucket);
1361 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1362 continue;
1363 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1364 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1365 } while (!sctp_port_hashtable && --order > 0);
1366 if (!sctp_port_hashtable) {
1367 pr_err("Failed bind hash alloc\n");
1368 status = -ENOMEM;
1369 goto err_bhash_alloc;
1370 }
1371 for (i = 0; i < sctp_port_hashsize; i++) {
1372 spin_lock_init(&sctp_port_hashtable[i].lock);
1373 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1374 }
1375
1376 pr_info("Hash tables configured (established %d bind %d)\n",
1377 sctp_assoc_hashsize, sctp_port_hashsize);
1378
1379 /* Disable ADDIP by default. */
1380 sctp_addip_enable = 0;
1381 sctp_addip_noauth = 0;
1382 sctp_default_auto_asconf = 0;
1383
1384 /* Enable PR-SCTP by default. */
1385 sctp_prsctp_enable = 1;
1386
1387 /* Disable AUTH by default. */
1388 sctp_auth_enable = 0;
1389
1390 /* Set SCOPE policy to enabled */
1391 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1392
1393 /* Set the default rwnd update threshold */
1394 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1395
1396 sctp_sysctl_register();
1397
1398 INIT_LIST_HEAD(&sctp_address_families);
1399 sctp_v4_pf_init();
1400 sctp_v6_pf_init();
1401
1402 /* Initialize the local address list. */
1403 INIT_LIST_HEAD(&sctp_local_addr_list);
1404 spin_lock_init(&sctp_local_addr_lock);
1405 sctp_get_local_addr_list();
1406
1407 /* Initialize the address event list */
1408 INIT_LIST_HEAD(&sctp_addr_waitq);
1409 INIT_LIST_HEAD(&sctp_auto_asconf_splist);
1410 spin_lock_init(&sctp_addr_wq_lock);
1411 sctp_addr_wq_timer.expires = 0;
1412 setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1413
1414 status = sctp_v4_protosw_init();
1415
1416 if (status)
1417 goto err_protosw_init;
1418
1419 status = sctp_v6_protosw_init();
1420 if (status)
1421 goto err_v6_protosw_init;
1422
1423 /* Initialize the control inode/socket for handling OOTB packets. */
1424 if ((status = sctp_ctl_sock_init())) {
1425 pr_err("Failed to initialize the SCTP control sock\n");
1426 goto err_ctl_sock_init;
1427 }
1428
1429 status = sctp_v4_add_protocol();
1430 if (status)
1431 goto err_add_protocol;
1432
1433 /* Register SCTP with inet6 layer. */
1434 status = sctp_v6_add_protocol();
1435 if (status)
1436 goto err_v6_add_protocol;
1437
1438 status = 0;
1439out:
1440 return status;
1441err_v6_add_protocol:
1442 sctp_v4_del_protocol();
1443err_add_protocol:
1444 inet_ctl_sock_destroy(sctp_ctl_sock);
1445err_ctl_sock_init:
1446 sctp_v6_protosw_exit();
1447err_v6_protosw_init:
1448 sctp_v4_protosw_exit();
1449err_protosw_init:
1450 sctp_free_local_addr_list();
1451 sctp_v4_pf_exit();
1452 sctp_v6_pf_exit();
1453 sctp_sysctl_unregister();
1454 free_pages((unsigned long)sctp_port_hashtable,
1455 get_order(sctp_port_hashsize *
1456 sizeof(struct sctp_bind_hashbucket)));
1457err_bhash_alloc:
1458 kfree(sctp_ep_hashtable);
1459err_ehash_alloc:
1460 free_pages((unsigned long)sctp_assoc_hashtable,
1461 get_order(sctp_assoc_hashsize *
1462 sizeof(struct sctp_hashbucket)));
1463err_ahash_alloc:
1464 sctp_dbg_objcnt_exit();
1465 sctp_proc_exit();
1466err_init_proc:
1467 cleanup_sctp_mibs();
1468err_init_mibs:
1469 kmem_cache_destroy(sctp_chunk_cachep);
1470err_chunk_cachep:
1471 kmem_cache_destroy(sctp_bucket_cachep);
1472 goto out;
1473}
1474
1475/* Exit handler for the SCTP protocol. */
1476SCTP_STATIC __exit void sctp_exit(void)
1477{
1478 /* BUG. This should probably do something useful like clean
1479 * up all the remaining associations and all that memory.
1480 */
1481
1482 /* Unregister with inet6/inet layers. */
1483 sctp_v6_del_protocol();
1484 sctp_v4_del_protocol();
1485 sctp_free_addr_wq();
1486
1487 /* Free the control endpoint. */
1488 inet_ctl_sock_destroy(sctp_ctl_sock);
1489
1490 /* Free protosw registrations */
1491 sctp_v6_protosw_exit();
1492 sctp_v4_protosw_exit();
1493
1494 /* Free the local address list. */
1495 sctp_free_local_addr_list();
1496
1497 /* Unregister with socket layer. */
1498 sctp_v6_pf_exit();
1499 sctp_v4_pf_exit();
1500
1501 sctp_sysctl_unregister();
1502
1503 free_pages((unsigned long)sctp_assoc_hashtable,
1504 get_order(sctp_assoc_hashsize *
1505 sizeof(struct sctp_hashbucket)));
1506 kfree(sctp_ep_hashtable);
1507 free_pages((unsigned long)sctp_port_hashtable,
1508 get_order(sctp_port_hashsize *
1509 sizeof(struct sctp_bind_hashbucket)));
1510
1511 sctp_dbg_objcnt_exit();
1512 sctp_proc_exit();
1513 cleanup_sctp_mibs();
1514
1515 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1516
1517 kmem_cache_destroy(sctp_chunk_cachep);
1518 kmem_cache_destroy(sctp_bucket_cachep);
1519}
1520
1521module_init(sctp_init);
1522module_exit(sctp_exit);
1523
1524/*
1525 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1526 */
1527MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1528MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1529MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1530MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1531module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1532MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1533MODULE_LICENSE("GPL");