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