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