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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, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 *
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
47 */
48
49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
51#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
56#include <linux/bootmem.h>
57#include <linux/highmem.h>
58#include <linux/swap.h>
59#include <linux/slab.h>
60#include <net/net_namespace.h>
61#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
64#include <net/route.h>
65#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70/* Global data structures. */
71struct sctp_globals sctp_globals __read_mostly;
72DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
73
74#ifdef CONFIG_PROC_FS
75struct proc_dir_entry *proc_net_sctp;
76#endif
77
78struct idr sctp_assocs_id;
79DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81/* This is the global socket data structure used for responding to
82 * the Out-of-the-blue (OOTB) packets. A control sock will be created
83 * for this socket at the initialization time.
84 */
85static struct sock *sctp_ctl_sock;
86
87static struct sctp_pf *sctp_pf_inet6_specific;
88static struct sctp_pf *sctp_pf_inet_specific;
89static struct sctp_af *sctp_af_v4_specific;
90static struct sctp_af *sctp_af_v6_specific;
91
92struct kmem_cache *sctp_chunk_cachep __read_mostly;
93struct kmem_cache *sctp_bucket_cachep __read_mostly;
94
95long sysctl_sctp_mem[3];
96int sysctl_sctp_rmem[3];
97int sysctl_sctp_wmem[3];
98
99/* Return the address of the control sock. */
100struct sock *sctp_get_ctl_sock(void)
101{
102 return sctp_ctl_sock;
103}
104
105/* Set up the proc fs entry for the SCTP protocol. */
106static __init int sctp_proc_init(void)
107{
108 if (percpu_counter_init(&sctp_sockets_allocated, 0))
109 goto out_nomem;
110#ifdef CONFIG_PROC_FS
111 if (!proc_net_sctp) {
112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
113 if (!proc_net_sctp)
114 goto out_free_percpu;
115 }
116
117 if (sctp_snmp_proc_init())
118 goto out_snmp_proc_init;
119 if (sctp_eps_proc_init())
120 goto out_eps_proc_init;
121 if (sctp_assocs_proc_init())
122 goto out_assocs_proc_init;
123 if (sctp_remaddr_proc_init())
124 goto out_remaddr_proc_init;
125
126 return 0;
127
128out_remaddr_proc_init:
129 sctp_assocs_proc_exit();
130out_assocs_proc_init:
131 sctp_eps_proc_exit();
132out_eps_proc_init:
133 sctp_snmp_proc_exit();
134out_snmp_proc_init:
135 if (proc_net_sctp) {
136 proc_net_sctp = NULL;
137 remove_proc_entry("sctp", init_net.proc_net);
138 }
139out_free_percpu:
140 percpu_counter_destroy(&sctp_sockets_allocated);
141#else
142 return 0;
143#endif /* CONFIG_PROC_FS */
144
145out_nomem:
146 return -ENOMEM;
147}
148
149/* Clean up the proc fs entry for the SCTP protocol.
150 * Note: Do not make this __exit as it is used in the init error
151 * path.
152 */
153static void sctp_proc_exit(void)
154{
155#ifdef CONFIG_PROC_FS
156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
159 sctp_remaddr_proc_exit();
160
161 if (proc_net_sctp) {
162 proc_net_sctp = NULL;
163 remove_proc_entry("sctp", init_net.proc_net);
164 }
165#endif
166 percpu_counter_destroy(&sctp_sockets_allocated);
167}
168
169/* Private helper to extract ipv4 address and stash them in
170 * the protocol structure.
171 */
172static void sctp_v4_copy_addrlist(struct list_head *addrlist,
173 struct net_device *dev)
174{
175 struct in_device *in_dev;
176 struct in_ifaddr *ifa;
177 struct sctp_sockaddr_entry *addr;
178
179 rcu_read_lock();
180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
181 rcu_read_unlock();
182 return;
183 }
184
185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
186 /* Add the address to the local list. */
187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
188 if (addr) {
189 addr->a.v4.sin_family = AF_INET;
190 addr->a.v4.sin_port = 0;
191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
192 addr->valid = 1;
193 INIT_LIST_HEAD(&addr->list);
194 list_add_tail(&addr->list, addrlist);
195 }
196 }
197
198 rcu_read_unlock();
199}
200
201/* Extract our IP addresses from the system and stash them in the
202 * protocol structure.
203 */
204static void sctp_get_local_addr_list(void)
205{
206 struct net_device *dev;
207 struct list_head *pos;
208 struct sctp_af *af;
209
210 rcu_read_lock();
211 for_each_netdev_rcu(&init_net, dev) {
212 __list_for_each(pos, &sctp_address_families) {
213 af = list_entry(pos, struct sctp_af, list);
214 af->copy_addrlist(&sctp_local_addr_list, dev);
215 }
216 }
217 rcu_read_unlock();
218}
219
220/* Free the existing local addresses. */
221static void sctp_free_local_addr_list(void)
222{
223 struct sctp_sockaddr_entry *addr;
224 struct list_head *pos, *temp;
225
226 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
227 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
228 list_del(pos);
229 kfree(addr);
230 }
231}
232
233/* Copy the local addresses which are valid for 'scope' into 'bp'. */
234int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
235 gfp_t gfp, int copy_flags)
236{
237 struct sctp_sockaddr_entry *addr;
238 int error = 0;
239
240 rcu_read_lock();
241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
242 if (!addr->valid)
243 continue;
244 if (sctp_in_scope(&addr->a, scope)) {
245 /* Now that the address is in scope, check to see if
246 * the address type is really supported by the local
247 * sock as well as the remote peer.
248 */
249 if ((((AF_INET == addr->a.sa.sa_family) &&
250 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
251 (((AF_INET6 == addr->a.sa.sa_family) &&
252 (copy_flags & SCTP_ADDR6_ALLOWED) &&
253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
254 error = sctp_add_bind_addr(bp, &addr->a,
255 SCTP_ADDR_SRC, GFP_ATOMIC);
256 if (error)
257 goto end_copy;
258 }
259 }
260 }
261
262end_copy:
263 rcu_read_unlock();
264 return error;
265}
266
267/* Initialize a sctp_addr from in incoming skb. */
268static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
269 int is_saddr)
270{
271 void *from;
272 __be16 *port;
273 struct sctphdr *sh;
274
275 port = &addr->v4.sin_port;
276 addr->v4.sin_family = AF_INET;
277
278 sh = sctp_hdr(skb);
279 if (is_saddr) {
280 *port = sh->source;
281 from = &ip_hdr(skb)->saddr;
282 } else {
283 *port = sh->dest;
284 from = &ip_hdr(skb)->daddr;
285 }
286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
287}
288
289/* Initialize an sctp_addr from a socket. */
290static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
291{
292 addr->v4.sin_family = AF_INET;
293 addr->v4.sin_port = 0;
294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
295}
296
297/* Initialize sk->sk_rcv_saddr from sctp_addr. */
298static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
299{
300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
301}
302
303/* Initialize sk->sk_daddr from sctp_addr. */
304static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
305{
306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
307}
308
309/* Initialize a sctp_addr from an address parameter. */
310static void sctp_v4_from_addr_param(union sctp_addr *addr,
311 union sctp_addr_param *param,
312 __be16 port, int iif)
313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_port = port;
316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
317}
318
319/* Initialize an address parameter from a sctp_addr and return the length
320 * of the address parameter.
321 */
322static int sctp_v4_to_addr_param(const union sctp_addr *addr,
323 union sctp_addr_param *param)
324{
325 int length = sizeof(sctp_ipv4addr_param_t);
326
327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
328 param->v4.param_hdr.length = htons(length);
329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
330
331 return length;
332}
333
334/* Initialize a sctp_addr from a dst_entry. */
335static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
336 __be16 port)
337{
338 saddr->v4.sin_family = AF_INET;
339 saddr->v4.sin_port = port;
340 saddr->v4.sin_addr.s_addr = fl4->saddr;
341}
342
343/* Compare two addresses exactly. */
344static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
345 const union sctp_addr *addr2)
346{
347 if (addr1->sa.sa_family != addr2->sa.sa_family)
348 return 0;
349 if (addr1->v4.sin_port != addr2->v4.sin_port)
350 return 0;
351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
352 return 0;
353
354 return 1;
355}
356
357/* Initialize addr struct to INADDR_ANY. */
358static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
359{
360 addr->v4.sin_family = AF_INET;
361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
362 addr->v4.sin_port = port;
363}
364
365/* Is this a wildcard address? */
366static int sctp_v4_is_any(const union sctp_addr *addr)
367{
368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
369}
370
371/* This function checks if the address is a valid address to be used for
372 * SCTP binding.
373 *
374 * Output:
375 * Return 0 - If the address is a non-unicast or an illegal address.
376 * Return 1 - If the address is a unicast.
377 */
378static int sctp_v4_addr_valid(union sctp_addr *addr,
379 struct sctp_sock *sp,
380 const struct sk_buff *skb)
381{
382 /* IPv4 addresses not allowed */
383 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
384 return 0;
385
386 /* Is this a non-unicast address or a unusable SCTP address? */
387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
388 return 0;
389
390 /* Is this a broadcast address? */
391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
392 return 0;
393
394 return 1;
395}
396
397/* Should this be available for binding? */
398static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
399{
400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
401
402
403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
404 ret != RTN_LOCAL &&
405 !sp->inet.freebind &&
406 !sysctl_ip_nonlocal_bind)
407 return 0;
408
409 if (ipv6_only_sock(sctp_opt2sk(sp)))
410 return 0;
411
412 return 1;
413}
414
415/* Checking the loopback, private and other address scopes as defined in
416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
418 *
419 * Level 0 - unusable SCTP addresses
420 * Level 1 - loopback address
421 * Level 2 - link-local addresses
422 * Level 3 - private addresses.
423 * Level 4 - global addresses
424 * For INIT and INIT-ACK address list, let L be the level of
425 * of requested destination address, sender and receiver
426 * SHOULD include all of its addresses with level greater
427 * than or equal to L.
428 *
429 * IPv4 scoping can be controlled through sysctl option
430 * net.sctp.addr_scope_policy
431 */
432static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
433{
434 sctp_scope_t retval;
435
436 /* Check for unusable SCTP addresses. */
437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
438 retval = SCTP_SCOPE_UNUSABLE;
439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
440 retval = SCTP_SCOPE_LOOPBACK;
441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
442 retval = SCTP_SCOPE_LINK;
443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
446 retval = SCTP_SCOPE_PRIVATE;
447 } else {
448 retval = SCTP_SCOPE_GLOBAL;
449 }
450
451 return retval;
452}
453
454/* Returns a valid dst cache entry for the given source and destination ip
455 * addresses. If an association is passed, trys to get a dst entry with a
456 * source address that matches an address in the bind address list.
457 */
458static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
459 struct flowi *fl, struct sock *sk)
460{
461 struct sctp_association *asoc = t->asoc;
462 struct rtable *rt;
463 struct flowi4 *fl4 = &fl->u.ip4;
464 struct sctp_bind_addr *bp;
465 struct sctp_sockaddr_entry *laddr;
466 struct dst_entry *dst = NULL;
467 union sctp_addr *daddr = &t->ipaddr;
468 union sctp_addr dst_saddr;
469
470 memset(fl4, 0x0, sizeof(struct flowi4));
471 fl4->daddr = daddr->v4.sin_addr.s_addr;
472 fl4->fl4_dport = daddr->v4.sin_port;
473 fl4->flowi4_proto = IPPROTO_SCTP;
474 if (asoc) {
475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
477 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
478 }
479 if (saddr) {
480 fl4->saddr = saddr->v4.sin_addr.s_addr;
481 fl4->fl4_sport = saddr->v4.sin_port;
482 }
483
484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
485 __func__, &fl4->daddr, &fl4->saddr);
486
487 rt = ip_route_output_key(&init_net, fl4);
488 if (!IS_ERR(rt))
489 dst = &rt->dst;
490
491 /* If there is no association or if a source address is passed, no
492 * more validation is required.
493 */
494 if (!asoc || saddr)
495 goto out;
496
497 bp = &asoc->base.bind_addr;
498
499 if (dst) {
500 /* Walk through the bind address list and look for a bind
501 * address that matches the source address of the returned dst.
502 */
503 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
506 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
507 (laddr->state != SCTP_ADDR_SRC &&
508 !asoc->src_out_of_asoc_ok))
509 continue;
510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
511 goto out_unlock;
512 }
513 rcu_read_unlock();
514
515 /* None of the bound addresses match the source address of the
516 * dst. So release it.
517 */
518 dst_release(dst);
519 dst = NULL;
520 }
521
522 /* Walk through the bind address list and try to get a dst that
523 * matches a bind address as the source address.
524 */
525 rcu_read_lock();
526 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
527 if (!laddr->valid)
528 continue;
529 if ((laddr->state == SCTP_ADDR_SRC) &&
530 (AF_INET == laddr->a.sa.sa_family)) {
531 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
532 fl4->fl4_sport = laddr->a.v4.sin_port;
533 rt = ip_route_output_key(&init_net, fl4);
534 if (!IS_ERR(rt)) {
535 dst = &rt->dst;
536 goto out_unlock;
537 }
538 }
539 }
540
541out_unlock:
542 rcu_read_unlock();
543out:
544 t->dst = dst;
545 if (dst)
546 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
547 &fl4->daddr, &fl4->saddr);
548 else
549 SCTP_DEBUG_PRINTK("NO ROUTE\n");
550}
551
552/* For v4, the source address is cached in the route entry(dst). So no need
553 * to cache it separately and hence this is an empty routine.
554 */
555static void sctp_v4_get_saddr(struct sctp_sock *sk,
556 struct sctp_transport *t,
557 struct flowi *fl)
558{
559 union sctp_addr *saddr = &t->saddr;
560 struct rtable *rt = (struct rtable *)t->dst;
561
562 if (rt) {
563 saddr->v4.sin_family = AF_INET;
564 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
565 }
566}
567
568/* What interface did this skb arrive on? */
569static int sctp_v4_skb_iif(const struct sk_buff *skb)
570{
571 return skb_rtable(skb)->rt_iif;
572}
573
574/* Was this packet marked by Explicit Congestion Notification? */
575static int sctp_v4_is_ce(const struct sk_buff *skb)
576{
577 return INET_ECN_is_ce(ip_hdr(skb)->tos);
578}
579
580/* Create and initialize a new sk for the socket returned by accept(). */
581static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
582 struct sctp_association *asoc)
583{
584 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
585 sk->sk_prot);
586 struct inet_sock *newinet;
587
588 if (!newsk)
589 goto out;
590
591 sock_init_data(NULL, newsk);
592
593 sctp_copy_sock(newsk, sk, asoc);
594 sock_reset_flag(newsk, SOCK_ZAPPED);
595
596 newinet = inet_sk(newsk);
597
598 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
599
600 sk_refcnt_debug_inc(newsk);
601
602 if (newsk->sk_prot->init(newsk)) {
603 sk_common_release(newsk);
604 newsk = NULL;
605 }
606
607out:
608 return newsk;
609}
610
611/* Map address, empty for v4 family */
612static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
613{
614 /* Empty */
615}
616
617/* Dump the v4 addr to the seq file. */
618static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
619{
620 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
621}
622
623static void sctp_v4_ecn_capable(struct sock *sk)
624{
625 INET_ECN_xmit(sk);
626}
627
628void sctp_addr_wq_timeout_handler(unsigned long arg)
629{
630 struct sctp_sockaddr_entry *addrw, *temp;
631 struct sctp_sock *sp;
632
633 spin_lock_bh(&sctp_addr_wq_lock);
634
635 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
636 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
637 " for cmd %d at entry %p\n", &sctp_addr_waitq, &addrw->a, addrw->state,
638 addrw);
639
640#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
641 /* Now we send an ASCONF for each association */
642 /* Note. we currently don't handle link local IPv6 addressees */
643 if (addrw->a.sa.sa_family == AF_INET6) {
644 struct in6_addr *in6;
645
646 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
647 IPV6_ADDR_LINKLOCAL)
648 goto free_next;
649
650 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
651 if (ipv6_chk_addr(&init_net, in6, NULL, 0) == 0 &&
652 addrw->state == SCTP_ADDR_NEW) {
653 unsigned long timeo_val;
654
655 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
656 SCTP_ADDRESS_TICK_DELAY);
657 timeo_val = jiffies;
658 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
659 mod_timer(&sctp_addr_wq_timer, timeo_val);
660 break;
661 }
662 }
663#endif
664 list_for_each_entry(sp, &sctp_auto_asconf_splist, auto_asconf_list) {
665 struct sock *sk;
666
667 sk = sctp_opt2sk(sp);
668 /* ignore bound-specific endpoints */
669 if (!sctp_is_ep_boundall(sk))
670 continue;
671 sctp_bh_lock_sock(sk);
672 if (sctp_asconf_mgmt(sp, addrw) < 0)
673 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
674 sctp_bh_unlock_sock(sk);
675 }
676free_next:
677 list_del(&addrw->list);
678 kfree(addrw);
679 }
680 spin_unlock_bh(&sctp_addr_wq_lock);
681}
682
683static void sctp_free_addr_wq(void)
684{
685 struct sctp_sockaddr_entry *addrw;
686 struct sctp_sockaddr_entry *temp;
687
688 spin_lock_bh(&sctp_addr_wq_lock);
689 del_timer(&sctp_addr_wq_timer);
690 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
691 list_del(&addrw->list);
692 kfree(addrw);
693 }
694 spin_unlock_bh(&sctp_addr_wq_lock);
695}
696
697/* lookup the entry for the same address in the addr_waitq
698 * sctp_addr_wq MUST be locked
699 */
700static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr)
701{
702 struct sctp_sockaddr_entry *addrw;
703
704 list_for_each_entry(addrw, &sctp_addr_waitq, list) {
705 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
706 continue;
707 if (addrw->a.sa.sa_family == AF_INET) {
708 if (addrw->a.v4.sin_addr.s_addr ==
709 addr->a.v4.sin_addr.s_addr)
710 return addrw;
711 } else if (addrw->a.sa.sa_family == AF_INET6) {
712 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
713 &addr->a.v6.sin6_addr))
714 return addrw;
715 }
716 }
717 return NULL;
718}
719
720void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd)
721{
722 struct sctp_sockaddr_entry *addrw;
723 unsigned long timeo_val;
724
725 /* first, we check if an opposite message already exist in the queue.
726 * If we found such message, it is removed.
727 * This operation is a bit stupid, but the DHCP client attaches the
728 * new address after a couple of addition and deletion of that address
729 */
730
731 spin_lock_bh(&sctp_addr_wq_lock);
732 /* Offsets existing events in addr_wq */
733 addrw = sctp_addr_wq_lookup(addr);
734 if (addrw) {
735 if (addrw->state != cmd) {
736 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
737 " in wq %p\n", addrw->state, &addrw->a,
738 &sctp_addr_waitq);
739 list_del(&addrw->list);
740 kfree(addrw);
741 }
742 spin_unlock_bh(&sctp_addr_wq_lock);
743 return;
744 }
745
746 /* OK, we have to add the new address to the wait queue */
747 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
748 if (addrw == NULL) {
749 spin_unlock_bh(&sctp_addr_wq_lock);
750 return;
751 }
752 addrw->state = cmd;
753 list_add_tail(&addrw->list, &sctp_addr_waitq);
754 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
755 " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq);
756
757 if (!timer_pending(&sctp_addr_wq_timer)) {
758 timeo_val = jiffies;
759 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
760 mod_timer(&sctp_addr_wq_timer, timeo_val);
761 }
762 spin_unlock_bh(&sctp_addr_wq_lock);
763}
764
765/* Event handler for inet address addition/deletion events.
766 * The sctp_local_addr_list needs to be protocted by a spin lock since
767 * multiple notifiers (say IPv4 and IPv6) may be running at the same
768 * time and thus corrupt the list.
769 * The reader side is protected with RCU.
770 */
771static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
772 void *ptr)
773{
774 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
775 struct sctp_sockaddr_entry *addr = NULL;
776 struct sctp_sockaddr_entry *temp;
777 int found = 0;
778
779 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
780 return NOTIFY_DONE;
781
782 switch (ev) {
783 case NETDEV_UP:
784 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
785 if (addr) {
786 addr->a.v4.sin_family = AF_INET;
787 addr->a.v4.sin_port = 0;
788 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
789 addr->valid = 1;
790 spin_lock_bh(&sctp_local_addr_lock);
791 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
792 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
793 spin_unlock_bh(&sctp_local_addr_lock);
794 }
795 break;
796 case NETDEV_DOWN:
797 spin_lock_bh(&sctp_local_addr_lock);
798 list_for_each_entry_safe(addr, temp,
799 &sctp_local_addr_list, list) {
800 if (addr->a.sa.sa_family == AF_INET &&
801 addr->a.v4.sin_addr.s_addr ==
802 ifa->ifa_local) {
803 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
804 found = 1;
805 addr->valid = 0;
806 list_del_rcu(&addr->list);
807 break;
808 }
809 }
810 spin_unlock_bh(&sctp_local_addr_lock);
811 if (found)
812 kfree_rcu(addr, rcu);
813 break;
814 }
815
816 return NOTIFY_DONE;
817}
818
819/*
820 * Initialize the control inode/socket with a control endpoint data
821 * structure. This endpoint is reserved exclusively for the OOTB processing.
822 */
823static int sctp_ctl_sock_init(void)
824{
825 int err;
826 sa_family_t family = PF_INET;
827
828 if (sctp_get_pf_specific(PF_INET6))
829 family = PF_INET6;
830
831 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
832 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
833
834 /* If IPv6 socket could not be created, try the IPv4 socket */
835 if (err < 0 && family == PF_INET6)
836 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
837 SOCK_SEQPACKET, IPPROTO_SCTP,
838 &init_net);
839
840 if (err < 0) {
841 pr_err("Failed to create the SCTP control socket\n");
842 return err;
843 }
844 return 0;
845}
846
847/* Register address family specific functions. */
848int sctp_register_af(struct sctp_af *af)
849{
850 switch (af->sa_family) {
851 case AF_INET:
852 if (sctp_af_v4_specific)
853 return 0;
854 sctp_af_v4_specific = af;
855 break;
856 case AF_INET6:
857 if (sctp_af_v6_specific)
858 return 0;
859 sctp_af_v6_specific = af;
860 break;
861 default:
862 return 0;
863 }
864
865 INIT_LIST_HEAD(&af->list);
866 list_add_tail(&af->list, &sctp_address_families);
867 return 1;
868}
869
870/* Get the table of functions for manipulating a particular address
871 * family.
872 */
873struct sctp_af *sctp_get_af_specific(sa_family_t family)
874{
875 switch (family) {
876 case AF_INET:
877 return sctp_af_v4_specific;
878 case AF_INET6:
879 return sctp_af_v6_specific;
880 default:
881 return NULL;
882 }
883}
884
885/* Common code to initialize a AF_INET msg_name. */
886static void sctp_inet_msgname(char *msgname, int *addr_len)
887{
888 struct sockaddr_in *sin;
889
890 sin = (struct sockaddr_in *)msgname;
891 *addr_len = sizeof(struct sockaddr_in);
892 sin->sin_family = AF_INET;
893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
894}
895
896/* Copy the primary address of the peer primary address as the msg_name. */
897static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
898 int *addr_len)
899{
900 struct sockaddr_in *sin, *sinfrom;
901
902 if (msgname) {
903 struct sctp_association *asoc;
904
905 asoc = event->asoc;
906 sctp_inet_msgname(msgname, addr_len);
907 sin = (struct sockaddr_in *)msgname;
908 sinfrom = &asoc->peer.primary_addr.v4;
909 sin->sin_port = htons(asoc->peer.port);
910 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
911 }
912}
913
914/* Initialize and copy out a msgname from an inbound skb. */
915static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
916{
917 if (msgname) {
918 struct sctphdr *sh = sctp_hdr(skb);
919 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
920
921 sctp_inet_msgname(msgname, len);
922 sin->sin_port = sh->source;
923 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
924 }
925}
926
927/* Do we support this AF? */
928static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
929{
930 /* PF_INET only supports AF_INET addresses. */
931 return AF_INET == family;
932}
933
934/* Address matching with wildcards allowed. */
935static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
936 const union sctp_addr *addr2,
937 struct sctp_sock *opt)
938{
939 /* PF_INET only supports AF_INET addresses. */
940 if (addr1->sa.sa_family != addr2->sa.sa_family)
941 return 0;
942 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
943 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
944 return 1;
945 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
946 return 1;
947
948 return 0;
949}
950
951/* Verify that provided sockaddr looks bindable. Common verification has
952 * already been taken care of.
953 */
954static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
955{
956 return sctp_v4_available(addr, opt);
957}
958
959/* Verify that sockaddr looks sendable. Common verification has already
960 * been taken care of.
961 */
962static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
963{
964 return 1;
965}
966
967/* Fill in Supported Address Type information for INIT and INIT-ACK
968 * chunks. Returns number of addresses supported.
969 */
970static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
971 __be16 *types)
972{
973 types[0] = SCTP_PARAM_IPV4_ADDRESS;
974 return 1;
975}
976
977/* Wrapper routine that calls the ip transmit routine. */
978static inline int sctp_v4_xmit(struct sk_buff *skb,
979 struct sctp_transport *transport)
980{
981 struct inet_sock *inet = inet_sk(skb->sk);
982
983 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
984 __func__, skb, skb->len,
985 &transport->fl.u.ip4.saddr,
986 &transport->fl.u.ip4.daddr);
987
988 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
989 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
990
991 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
992 return ip_queue_xmit(skb, &transport->fl);
993}
994
995static struct sctp_af sctp_af_inet;
996
997static struct sctp_pf sctp_pf_inet = {
998 .event_msgname = sctp_inet_event_msgname,
999 .skb_msgname = sctp_inet_skb_msgname,
1000 .af_supported = sctp_inet_af_supported,
1001 .cmp_addr = sctp_inet_cmp_addr,
1002 .bind_verify = sctp_inet_bind_verify,
1003 .send_verify = sctp_inet_send_verify,
1004 .supported_addrs = sctp_inet_supported_addrs,
1005 .create_accept_sk = sctp_v4_create_accept_sk,
1006 .addr_v4map = sctp_v4_addr_v4map,
1007 .af = &sctp_af_inet
1008};
1009
1010/* Notifier for inetaddr addition/deletion events. */
1011static struct notifier_block sctp_inetaddr_notifier = {
1012 .notifier_call = sctp_inetaddr_event,
1013};
1014
1015/* Socket operations. */
1016static const struct proto_ops inet_seqpacket_ops = {
1017 .family = PF_INET,
1018 .owner = THIS_MODULE,
1019 .release = inet_release, /* Needs to be wrapped... */
1020 .bind = inet_bind,
1021 .connect = inet_dgram_connect,
1022 .socketpair = sock_no_socketpair,
1023 .accept = inet_accept,
1024 .getname = inet_getname, /* Semantics are different. */
1025 .poll = sctp_poll,
1026 .ioctl = inet_ioctl,
1027 .listen = sctp_inet_listen,
1028 .shutdown = inet_shutdown, /* Looks harmless. */
1029 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1030 .getsockopt = sock_common_getsockopt,
1031 .sendmsg = inet_sendmsg,
1032 .recvmsg = sock_common_recvmsg,
1033 .mmap = sock_no_mmap,
1034 .sendpage = sock_no_sendpage,
1035#ifdef CONFIG_COMPAT
1036 .compat_setsockopt = compat_sock_common_setsockopt,
1037 .compat_getsockopt = compat_sock_common_getsockopt,
1038#endif
1039};
1040
1041/* Registration with AF_INET family. */
1042static struct inet_protosw sctp_seqpacket_protosw = {
1043 .type = SOCK_SEQPACKET,
1044 .protocol = IPPROTO_SCTP,
1045 .prot = &sctp_prot,
1046 .ops = &inet_seqpacket_ops,
1047 .no_check = 0,
1048 .flags = SCTP_PROTOSW_FLAG
1049};
1050static struct inet_protosw sctp_stream_protosw = {
1051 .type = SOCK_STREAM,
1052 .protocol = IPPROTO_SCTP,
1053 .prot = &sctp_prot,
1054 .ops = &inet_seqpacket_ops,
1055 .no_check = 0,
1056 .flags = SCTP_PROTOSW_FLAG
1057};
1058
1059/* Register with IP layer. */
1060static const struct net_protocol sctp_protocol = {
1061 .handler = sctp_rcv,
1062 .err_handler = sctp_v4_err,
1063 .no_policy = 1,
1064};
1065
1066/* IPv4 address related functions. */
1067static struct sctp_af sctp_af_inet = {
1068 .sa_family = AF_INET,
1069 .sctp_xmit = sctp_v4_xmit,
1070 .setsockopt = ip_setsockopt,
1071 .getsockopt = ip_getsockopt,
1072 .get_dst = sctp_v4_get_dst,
1073 .get_saddr = sctp_v4_get_saddr,
1074 .copy_addrlist = sctp_v4_copy_addrlist,
1075 .from_skb = sctp_v4_from_skb,
1076 .from_sk = sctp_v4_from_sk,
1077 .to_sk_saddr = sctp_v4_to_sk_saddr,
1078 .to_sk_daddr = sctp_v4_to_sk_daddr,
1079 .from_addr_param = sctp_v4_from_addr_param,
1080 .to_addr_param = sctp_v4_to_addr_param,
1081 .cmp_addr = sctp_v4_cmp_addr,
1082 .addr_valid = sctp_v4_addr_valid,
1083 .inaddr_any = sctp_v4_inaddr_any,
1084 .is_any = sctp_v4_is_any,
1085 .available = sctp_v4_available,
1086 .scope = sctp_v4_scope,
1087 .skb_iif = sctp_v4_skb_iif,
1088 .is_ce = sctp_v4_is_ce,
1089 .seq_dump_addr = sctp_v4_seq_dump_addr,
1090 .ecn_capable = sctp_v4_ecn_capable,
1091 .net_header_len = sizeof(struct iphdr),
1092 .sockaddr_len = sizeof(struct sockaddr_in),
1093#ifdef CONFIG_COMPAT
1094 .compat_setsockopt = compat_ip_setsockopt,
1095 .compat_getsockopt = compat_ip_getsockopt,
1096#endif
1097};
1098
1099struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1100
1101 switch (family) {
1102 case PF_INET:
1103 return sctp_pf_inet_specific;
1104 case PF_INET6:
1105 return sctp_pf_inet6_specific;
1106 default:
1107 return NULL;
1108 }
1109}
1110
1111/* Register the PF specific function table. */
1112int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1113{
1114 switch (family) {
1115 case PF_INET:
1116 if (sctp_pf_inet_specific)
1117 return 0;
1118 sctp_pf_inet_specific = pf;
1119 break;
1120 case PF_INET6:
1121 if (sctp_pf_inet6_specific)
1122 return 0;
1123 sctp_pf_inet6_specific = pf;
1124 break;
1125 default:
1126 return 0;
1127 }
1128 return 1;
1129}
1130
1131static inline int init_sctp_mibs(void)
1132{
1133 return snmp_mib_init((void __percpu **)sctp_statistics,
1134 sizeof(struct sctp_mib),
1135 __alignof__(struct sctp_mib));
1136}
1137
1138static inline void cleanup_sctp_mibs(void)
1139{
1140 snmp_mib_free((void __percpu **)sctp_statistics);
1141}
1142
1143static void sctp_v4_pf_init(void)
1144{
1145 /* Initialize the SCTP specific PF functions. */
1146 sctp_register_pf(&sctp_pf_inet, PF_INET);
1147 sctp_register_af(&sctp_af_inet);
1148}
1149
1150static void sctp_v4_pf_exit(void)
1151{
1152 list_del(&sctp_af_inet.list);
1153}
1154
1155static int sctp_v4_protosw_init(void)
1156{
1157 int rc;
1158
1159 rc = proto_register(&sctp_prot, 1);
1160 if (rc)
1161 return rc;
1162
1163 /* Register SCTP(UDP and TCP style) with socket layer. */
1164 inet_register_protosw(&sctp_seqpacket_protosw);
1165 inet_register_protosw(&sctp_stream_protosw);
1166
1167 return 0;
1168}
1169
1170static void sctp_v4_protosw_exit(void)
1171{
1172 inet_unregister_protosw(&sctp_stream_protosw);
1173 inet_unregister_protosw(&sctp_seqpacket_protosw);
1174 proto_unregister(&sctp_prot);
1175}
1176
1177static int sctp_v4_add_protocol(void)
1178{
1179 /* Register notifier for inet address additions/deletions. */
1180 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1181
1182 /* Register SCTP with inet layer. */
1183 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1184 return -EAGAIN;
1185
1186 return 0;
1187}
1188
1189static void sctp_v4_del_protocol(void)
1190{
1191 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1192 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1193}
1194
1195/* Initialize the universe into something sensible. */
1196SCTP_STATIC __init int sctp_init(void)
1197{
1198 int i;
1199 int status = -EINVAL;
1200 unsigned long goal;
1201 unsigned long limit;
1202 int max_share;
1203 int order;
1204
1205 /* SCTP_DEBUG sanity check. */
1206 if (!sctp_sanity_check())
1207 goto out;
1208
1209 /* Allocate bind_bucket and chunk caches. */
1210 status = -ENOBUFS;
1211 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1212 sizeof(struct sctp_bind_bucket),
1213 0, SLAB_HWCACHE_ALIGN,
1214 NULL);
1215 if (!sctp_bucket_cachep)
1216 goto out;
1217
1218 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1219 sizeof(struct sctp_chunk),
1220 0, SLAB_HWCACHE_ALIGN,
1221 NULL);
1222 if (!sctp_chunk_cachep)
1223 goto err_chunk_cachep;
1224
1225 /* Allocate and initialise sctp mibs. */
1226 status = init_sctp_mibs();
1227 if (status)
1228 goto err_init_mibs;
1229
1230 /* Initialize proc fs directory. */
1231 status = sctp_proc_init();
1232 if (status)
1233 goto err_init_proc;
1234
1235 /* Initialize object count debugging. */
1236 sctp_dbg_objcnt_init();
1237
1238 /*
1239 * 14. Suggested SCTP Protocol Parameter Values
1240 */
1241 /* The following protocol parameters are RECOMMENDED: */
1242 /* RTO.Initial - 3 seconds */
1243 sctp_rto_initial = SCTP_RTO_INITIAL;
1244 /* RTO.Min - 1 second */
1245 sctp_rto_min = SCTP_RTO_MIN;
1246 /* RTO.Max - 60 seconds */
1247 sctp_rto_max = SCTP_RTO_MAX;
1248 /* RTO.Alpha - 1/8 */
1249 sctp_rto_alpha = SCTP_RTO_ALPHA;
1250 /* RTO.Beta - 1/4 */
1251 sctp_rto_beta = SCTP_RTO_BETA;
1252
1253 /* Valid.Cookie.Life - 60 seconds */
1254 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1255
1256 /* Whether Cookie Preservative is enabled(1) or not(0) */
1257 sctp_cookie_preserve_enable = 1;
1258
1259 /* Max.Burst - 4 */
1260 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
1261
1262 /* Association.Max.Retrans - 10 attempts
1263 * Path.Max.Retrans - 5 attempts (per destination address)
1264 * Max.Init.Retransmits - 8 attempts
1265 */
1266 sctp_max_retrans_association = 10;
1267 sctp_max_retrans_path = 5;
1268 sctp_max_retrans_init = 8;
1269
1270 /* Sendbuffer growth - do per-socket accounting */
1271 sctp_sndbuf_policy = 0;
1272
1273 /* Rcvbuffer growth - do per-socket accounting */
1274 sctp_rcvbuf_policy = 0;
1275
1276 /* HB.interval - 30 seconds */
1277 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1278
1279 /* delayed SACK timeout */
1280 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1281
1282 /* Implementation specific variables. */
1283
1284 /* Initialize default stream count setup information. */
1285 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1286 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1287
1288 /* Initialize handle used for association ids. */
1289 idr_init(&sctp_assocs_id);
1290
1291 limit = nr_free_buffer_pages() / 8;
1292 limit = max(limit, 128UL);
1293 sysctl_sctp_mem[0] = limit / 4 * 3;
1294 sysctl_sctp_mem[1] = limit;
1295 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1296
1297 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1298 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1299 max_share = min(4UL*1024*1024, limit);
1300
1301 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1302 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1303 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1304
1305 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1306 sysctl_sctp_wmem[1] = 16*1024;
1307 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1308
1309 /* Size and allocate the association hash table.
1310 * The methodology is similar to that of the tcp hash tables.
1311 */
1312 if (totalram_pages >= (128 * 1024))
1313 goal = totalram_pages >> (22 - PAGE_SHIFT);
1314 else
1315 goal = totalram_pages >> (24 - PAGE_SHIFT);
1316
1317 for (order = 0; (1UL << order) < goal; order++)
1318 ;
1319
1320 do {
1321 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1322 sizeof(struct sctp_hashbucket);
1323 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1324 continue;
1325 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1326 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1327 } while (!sctp_assoc_hashtable && --order > 0);
1328 if (!sctp_assoc_hashtable) {
1329 pr_err("Failed association hash alloc\n");
1330 status = -ENOMEM;
1331 goto err_ahash_alloc;
1332 }
1333 for (i = 0; i < sctp_assoc_hashsize; i++) {
1334 rwlock_init(&sctp_assoc_hashtable[i].lock);
1335 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1336 }
1337
1338 /* Allocate and initialize the endpoint hash table. */
1339 sctp_ep_hashsize = 64;
1340 sctp_ep_hashtable = (struct sctp_hashbucket *)
1341 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1342 if (!sctp_ep_hashtable) {
1343 pr_err("Failed endpoint_hash alloc\n");
1344 status = -ENOMEM;
1345 goto err_ehash_alloc;
1346 }
1347 for (i = 0; i < sctp_ep_hashsize; i++) {
1348 rwlock_init(&sctp_ep_hashtable[i].lock);
1349 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1350 }
1351
1352 /* Allocate and initialize the SCTP port hash table. */
1353 do {
1354 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1355 sizeof(struct sctp_bind_hashbucket);
1356 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1357 continue;
1358 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1359 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1360 } while (!sctp_port_hashtable && --order > 0);
1361 if (!sctp_port_hashtable) {
1362 pr_err("Failed bind hash alloc\n");
1363 status = -ENOMEM;
1364 goto err_bhash_alloc;
1365 }
1366 for (i = 0; i < sctp_port_hashsize; i++) {
1367 spin_lock_init(&sctp_port_hashtable[i].lock);
1368 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1369 }
1370
1371 pr_info("Hash tables configured (established %d bind %d)\n",
1372 sctp_assoc_hashsize, sctp_port_hashsize);
1373
1374 /* Disable ADDIP by default. */
1375 sctp_addip_enable = 0;
1376 sctp_addip_noauth = 0;
1377 sctp_default_auto_asconf = 0;
1378
1379 /* Enable PR-SCTP by default. */
1380 sctp_prsctp_enable = 1;
1381
1382 /* Disable AUTH by default. */
1383 sctp_auth_enable = 0;
1384
1385 /* Set SCOPE policy to enabled */
1386 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1387
1388 /* Set the default rwnd update threshold */
1389 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1390
1391 sctp_sysctl_register();
1392
1393 INIT_LIST_HEAD(&sctp_address_families);
1394 sctp_v4_pf_init();
1395 sctp_v6_pf_init();
1396
1397 /* Initialize the local address list. */
1398 INIT_LIST_HEAD(&sctp_local_addr_list);
1399 spin_lock_init(&sctp_local_addr_lock);
1400 sctp_get_local_addr_list();
1401
1402 /* Initialize the address event list */
1403 INIT_LIST_HEAD(&sctp_addr_waitq);
1404 INIT_LIST_HEAD(&sctp_auto_asconf_splist);
1405 spin_lock_init(&sctp_addr_wq_lock);
1406 sctp_addr_wq_timer.expires = 0;
1407 setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1408
1409 status = sctp_v4_protosw_init();
1410
1411 if (status)
1412 goto err_protosw_init;
1413
1414 status = sctp_v6_protosw_init();
1415 if (status)
1416 goto err_v6_protosw_init;
1417
1418 /* Initialize the control inode/socket for handling OOTB packets. */
1419 if ((status = sctp_ctl_sock_init())) {
1420 pr_err("Failed to initialize the SCTP control sock\n");
1421 goto err_ctl_sock_init;
1422 }
1423
1424 status = sctp_v4_add_protocol();
1425 if (status)
1426 goto err_add_protocol;
1427
1428 /* Register SCTP with inet6 layer. */
1429 status = sctp_v6_add_protocol();
1430 if (status)
1431 goto err_v6_add_protocol;
1432
1433 status = 0;
1434out:
1435 return status;
1436err_v6_add_protocol:
1437 sctp_v4_del_protocol();
1438err_add_protocol:
1439 inet_ctl_sock_destroy(sctp_ctl_sock);
1440err_ctl_sock_init:
1441 sctp_v6_protosw_exit();
1442err_v6_protosw_init:
1443 sctp_v4_protosw_exit();
1444err_protosw_init:
1445 sctp_free_local_addr_list();
1446 sctp_v4_pf_exit();
1447 sctp_v6_pf_exit();
1448 sctp_sysctl_unregister();
1449 free_pages((unsigned long)sctp_port_hashtable,
1450 get_order(sctp_port_hashsize *
1451 sizeof(struct sctp_bind_hashbucket)));
1452err_bhash_alloc:
1453 kfree(sctp_ep_hashtable);
1454err_ehash_alloc:
1455 free_pages((unsigned long)sctp_assoc_hashtable,
1456 get_order(sctp_assoc_hashsize *
1457 sizeof(struct sctp_hashbucket)));
1458err_ahash_alloc:
1459 sctp_dbg_objcnt_exit();
1460 sctp_proc_exit();
1461err_init_proc:
1462 cleanup_sctp_mibs();
1463err_init_mibs:
1464 kmem_cache_destroy(sctp_chunk_cachep);
1465err_chunk_cachep:
1466 kmem_cache_destroy(sctp_bucket_cachep);
1467 goto out;
1468}
1469
1470/* Exit handler for the SCTP protocol. */
1471SCTP_STATIC __exit void sctp_exit(void)
1472{
1473 /* BUG. This should probably do something useful like clean
1474 * up all the remaining associations and all that memory.
1475 */
1476
1477 /* Unregister with inet6/inet layers. */
1478 sctp_v6_del_protocol();
1479 sctp_v4_del_protocol();
1480 sctp_free_addr_wq();
1481
1482 /* Free the control endpoint. */
1483 inet_ctl_sock_destroy(sctp_ctl_sock);
1484
1485 /* Free protosw registrations */
1486 sctp_v6_protosw_exit();
1487 sctp_v4_protosw_exit();
1488
1489 /* Free the local address list. */
1490 sctp_free_local_addr_list();
1491
1492 /* Unregister with socket layer. */
1493 sctp_v6_pf_exit();
1494 sctp_v4_pf_exit();
1495
1496 sctp_sysctl_unregister();
1497
1498 free_pages((unsigned long)sctp_assoc_hashtable,
1499 get_order(sctp_assoc_hashsize *
1500 sizeof(struct sctp_hashbucket)));
1501 kfree(sctp_ep_hashtable);
1502 free_pages((unsigned long)sctp_port_hashtable,
1503 get_order(sctp_port_hashsize *
1504 sizeof(struct sctp_bind_hashbucket)));
1505
1506 sctp_dbg_objcnt_exit();
1507 sctp_proc_exit();
1508 cleanup_sctp_mibs();
1509
1510 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1511
1512 kmem_cache_destroy(sctp_chunk_cachep);
1513 kmem_cache_destroy(sctp_bucket_cachep);
1514}
1515
1516module_init(sctp_init);
1517module_exit(sctp_exit);
1518
1519/*
1520 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1521 */
1522MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1523MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1524MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1525MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1526module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1527MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1528MODULE_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/swap.h>
37#include <linux/slab.h>
38#include <net/net_namespace.h>
39#include <net/protocol.h>
40#include <net/ip.h>
41#include <net/ipv6.h>
42#include <net/route.h>
43#include <net/sctp/sctp.h>
44#include <net/addrconf.h>
45#include <net/inet_common.h>
46#include <net/inet_ecn.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 void sctp_v4_from_addr_param(union sctp_addr *addr,
257 union sctp_addr_param *param,
258 __be16 port, int iif)
259{
260 addr->v4.sin_family = AF_INET;
261 addr->v4.sin_port = port;
262 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
263 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
264}
265
266/* Initialize an address parameter from a sctp_addr and return the length
267 * of the address parameter.
268 */
269static int sctp_v4_to_addr_param(const union sctp_addr *addr,
270 union sctp_addr_param *param)
271{
272 int length = sizeof(struct sctp_ipv4addr_param);
273
274 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
275 param->v4.param_hdr.length = htons(length);
276 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
277
278 return length;
279}
280
281/* Initialize a sctp_addr from a dst_entry. */
282static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
283 __be16 port)
284{
285 saddr->v4.sin_family = AF_INET;
286 saddr->v4.sin_port = port;
287 saddr->v4.sin_addr.s_addr = fl4->saddr;
288 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
289}
290
291/* Compare two addresses exactly. */
292static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
293 const union sctp_addr *addr2)
294{
295 if (addr1->sa.sa_family != addr2->sa.sa_family)
296 return 0;
297 if (addr1->v4.sin_port != addr2->v4.sin_port)
298 return 0;
299 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
300 return 0;
301
302 return 1;
303}
304
305/* Initialize addr struct to INADDR_ANY. */
306static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
307{
308 addr->v4.sin_family = AF_INET;
309 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
310 addr->v4.sin_port = port;
311 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
312}
313
314/* Is this a wildcard address? */
315static int sctp_v4_is_any(const union sctp_addr *addr)
316{
317 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
318}
319
320/* This function checks if the address is a valid address to be used for
321 * SCTP binding.
322 *
323 * Output:
324 * Return 0 - If the address is a non-unicast or an illegal address.
325 * Return 1 - If the address is a unicast.
326 */
327static int sctp_v4_addr_valid(union sctp_addr *addr,
328 struct sctp_sock *sp,
329 const struct sk_buff *skb)
330{
331 /* IPv4 addresses not allowed */
332 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
333 return 0;
334
335 /* Is this a non-unicast address or a unusable SCTP address? */
336 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
337 return 0;
338
339 /* Is this a broadcast address? */
340 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
341 return 0;
342
343 return 1;
344}
345
346/* Should this be available for binding? */
347static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
348{
349 struct net *net = sock_net(&sp->inet.sk);
350 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
351
352
353 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
354 ret != RTN_LOCAL &&
355 !sp->inet.freebind &&
356 !net->ipv4.sysctl_ip_nonlocal_bind)
357 return 0;
358
359 if (ipv6_only_sock(sctp_opt2sk(sp)))
360 return 0;
361
362 return 1;
363}
364
365/* Checking the loopback, private and other address scopes as defined in
366 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
367 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
368 *
369 * Level 0 - unusable SCTP addresses
370 * Level 1 - loopback address
371 * Level 2 - link-local addresses
372 * Level 3 - private addresses.
373 * Level 4 - global addresses
374 * For INIT and INIT-ACK address list, let L be the level of
375 * of requested destination address, sender and receiver
376 * SHOULD include all of its addresses with level greater
377 * than or equal to L.
378 *
379 * IPv4 scoping can be controlled through sysctl option
380 * net.sctp.addr_scope_policy
381 */
382static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
383{
384 enum sctp_scope retval;
385
386 /* Check for unusable SCTP addresses. */
387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
388 retval = SCTP_SCOPE_UNUSABLE;
389 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
390 retval = SCTP_SCOPE_LOOPBACK;
391 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
392 retval = SCTP_SCOPE_LINK;
393 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
394 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
395 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
396 retval = SCTP_SCOPE_PRIVATE;
397 } else {
398 retval = SCTP_SCOPE_GLOBAL;
399 }
400
401 return retval;
402}
403
404/* Returns a valid dst cache entry for the given source and destination ip
405 * addresses. If an association is passed, trys to get a dst entry with a
406 * source address that matches an address in the bind address list.
407 */
408static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
409 struct flowi *fl, struct sock *sk)
410{
411 struct sctp_association *asoc = t->asoc;
412 struct rtable *rt;
413 struct flowi _fl;
414 struct flowi4 *fl4 = &_fl.u.ip4;
415 struct sctp_bind_addr *bp;
416 struct sctp_sockaddr_entry *laddr;
417 struct dst_entry *dst = NULL;
418 union sctp_addr *daddr = &t->ipaddr;
419 union sctp_addr dst_saddr;
420 __u8 tos = inet_sk(sk)->tos;
421
422 if (t->dscp & SCTP_DSCP_SET_MASK)
423 tos = t->dscp & SCTP_DSCP_VAL_MASK;
424 memset(&_fl, 0x0, sizeof(_fl));
425 fl4->daddr = daddr->v4.sin_addr.s_addr;
426 fl4->fl4_dport = daddr->v4.sin_port;
427 fl4->flowi4_proto = IPPROTO_SCTP;
428 if (asoc) {
429 fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
430 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
431 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
432 }
433 if (saddr) {
434 fl4->saddr = saddr->v4.sin_addr.s_addr;
435 if (!fl4->fl4_sport)
436 fl4->fl4_sport = saddr->v4.sin_port;
437 }
438
439 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
440 &fl4->saddr);
441
442 rt = ip_route_output_key(sock_net(sk), fl4);
443 if (!IS_ERR(rt)) {
444 dst = &rt->dst;
445 t->dst = dst;
446 memcpy(fl, &_fl, sizeof(_fl));
447 }
448
449 /* If there is no association or if a source address is passed, no
450 * more validation is required.
451 */
452 if (!asoc || saddr)
453 goto out;
454
455 bp = &asoc->base.bind_addr;
456
457 if (dst) {
458 /* Walk through the bind address list and look for a bind
459 * address that matches the source address of the returned dst.
460 */
461 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
462 rcu_read_lock();
463 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
464 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
465 (laddr->state != SCTP_ADDR_SRC &&
466 !asoc->src_out_of_asoc_ok))
467 continue;
468 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
469 goto out_unlock;
470 }
471 rcu_read_unlock();
472
473 /* None of the bound addresses match the source address of the
474 * dst. So release it.
475 */
476 dst_release(dst);
477 dst = NULL;
478 }
479
480 /* Walk through the bind address list and try to get a dst that
481 * matches a bind address as the source address.
482 */
483 rcu_read_lock();
484 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
485 struct net_device *odev;
486
487 if (!laddr->valid)
488 continue;
489 if (laddr->state != SCTP_ADDR_SRC ||
490 AF_INET != laddr->a.sa.sa_family)
491 continue;
492
493 fl4->fl4_sport = laddr->a.v4.sin_port;
494 flowi4_update_output(fl4,
495 asoc->base.sk->sk_bound_dev_if,
496 RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
497 daddr->v4.sin_addr.s_addr,
498 laddr->a.v4.sin_addr.s_addr);
499
500 rt = ip_route_output_key(sock_net(sk), fl4);
501 if (IS_ERR(rt))
502 continue;
503
504 /* Ensure the src address belongs to the output
505 * interface.
506 */
507 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
508 false);
509 if (!odev || odev->ifindex != fl4->flowi4_oif) {
510 if (!dst) {
511 dst = &rt->dst;
512 t->dst = dst;
513 memcpy(fl, &_fl, sizeof(_fl));
514 } else {
515 dst_release(&rt->dst);
516 }
517 continue;
518 }
519
520 dst_release(dst);
521 dst = &rt->dst;
522 t->dst = dst;
523 memcpy(fl, &_fl, sizeof(_fl));
524 break;
525 }
526
527out_unlock:
528 rcu_read_unlock();
529out:
530 if (dst) {
531 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
532 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
533 } else {
534 t->dst = NULL;
535 pr_debug("no route\n");
536 }
537}
538
539/* For v4, the source address is cached in the route entry(dst). So no need
540 * to cache it separately and hence this is an empty routine.
541 */
542static void sctp_v4_get_saddr(struct sctp_sock *sk,
543 struct sctp_transport *t,
544 struct flowi *fl)
545{
546 union sctp_addr *saddr = &t->saddr;
547 struct rtable *rt = (struct rtable *)t->dst;
548
549 if (rt) {
550 saddr->v4.sin_family = AF_INET;
551 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
552 }
553}
554
555/* What interface did this skb arrive on? */
556static int sctp_v4_skb_iif(const struct sk_buff *skb)
557{
558 return inet_iif(skb);
559}
560
561/* Was this packet marked by Explicit Congestion Notification? */
562static int sctp_v4_is_ce(const struct sk_buff *skb)
563{
564 return INET_ECN_is_ce(ip_hdr(skb)->tos);
565}
566
567/* Create and initialize a new sk for the socket returned by accept(). */
568static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
569 struct sctp_association *asoc,
570 bool kern)
571{
572 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
573 sk->sk_prot, kern);
574 struct inet_sock *newinet;
575
576 if (!newsk)
577 goto out;
578
579 sock_init_data(NULL, newsk);
580
581 sctp_copy_sock(newsk, sk, asoc);
582 sock_reset_flag(newsk, SOCK_ZAPPED);
583
584 sctp_v4_copy_ip_options(sk, newsk);
585
586 newinet = inet_sk(newsk);
587
588 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
589
590 sk_refcnt_debug_inc(newsk);
591
592 if (newsk->sk_prot->init(newsk)) {
593 sk_common_release(newsk);
594 newsk = NULL;
595 }
596
597out:
598 return newsk;
599}
600
601static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
602{
603 /* No address mapping for V4 sockets */
604 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
605 return sizeof(struct sockaddr_in);
606}
607
608/* Dump the v4 addr to the seq file. */
609static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
610{
611 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
612}
613
614static void sctp_v4_ecn_capable(struct sock *sk)
615{
616 INET_ECN_xmit(sk);
617}
618
619static void sctp_addr_wq_timeout_handler(struct timer_list *t)
620{
621 struct net *net = from_timer(net, t, sctp.addr_wq_timer);
622 struct sctp_sockaddr_entry *addrw, *temp;
623 struct sctp_sock *sp;
624
625 spin_lock_bh(&net->sctp.addr_wq_lock);
626
627 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
628 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
629 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
630 addrw->state, addrw);
631
632#if IS_ENABLED(CONFIG_IPV6)
633 /* Now we send an ASCONF for each association */
634 /* Note. we currently don't handle link local IPv6 addressees */
635 if (addrw->a.sa.sa_family == AF_INET6) {
636 struct in6_addr *in6;
637
638 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
639 IPV6_ADDR_LINKLOCAL)
640 goto free_next;
641
642 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
643 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
644 addrw->state == SCTP_ADDR_NEW) {
645 unsigned long timeo_val;
646
647 pr_debug("%s: this is on DAD, trying %d sec "
648 "later\n", __func__,
649 SCTP_ADDRESS_TICK_DELAY);
650
651 timeo_val = jiffies;
652 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
653 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
654 break;
655 }
656 }
657#endif
658 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
659 struct sock *sk;
660
661 sk = sctp_opt2sk(sp);
662 /* ignore bound-specific endpoints */
663 if (!sctp_is_ep_boundall(sk))
664 continue;
665 bh_lock_sock(sk);
666 if (sctp_asconf_mgmt(sp, addrw) < 0)
667 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
668 bh_unlock_sock(sk);
669 }
670#if IS_ENABLED(CONFIG_IPV6)
671free_next:
672#endif
673 list_del(&addrw->list);
674 kfree(addrw);
675 }
676 spin_unlock_bh(&net->sctp.addr_wq_lock);
677}
678
679static void sctp_free_addr_wq(struct net *net)
680{
681 struct sctp_sockaddr_entry *addrw;
682 struct sctp_sockaddr_entry *temp;
683
684 spin_lock_bh(&net->sctp.addr_wq_lock);
685 del_timer(&net->sctp.addr_wq_timer);
686 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
687 list_del(&addrw->list);
688 kfree(addrw);
689 }
690 spin_unlock_bh(&net->sctp.addr_wq_lock);
691}
692
693/* lookup the entry for the same address in the addr_waitq
694 * sctp_addr_wq MUST be locked
695 */
696static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
697 struct sctp_sockaddr_entry *addr)
698{
699 struct sctp_sockaddr_entry *addrw;
700
701 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
702 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
703 continue;
704 if (addrw->a.sa.sa_family == AF_INET) {
705 if (addrw->a.v4.sin_addr.s_addr ==
706 addr->a.v4.sin_addr.s_addr)
707 return addrw;
708 } else if (addrw->a.sa.sa_family == AF_INET6) {
709 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
710 &addr->a.v6.sin6_addr))
711 return addrw;
712 }
713 }
714 return NULL;
715}
716
717void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
718{
719 struct sctp_sockaddr_entry *addrw;
720 unsigned long timeo_val;
721
722 /* first, we check if an opposite message already exist in the queue.
723 * If we found such message, it is removed.
724 * This operation is a bit stupid, but the DHCP client attaches the
725 * new address after a couple of addition and deletion of that address
726 */
727
728 spin_lock_bh(&net->sctp.addr_wq_lock);
729 /* Offsets existing events in addr_wq */
730 addrw = sctp_addr_wq_lookup(net, addr);
731 if (addrw) {
732 if (addrw->state != cmd) {
733 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
734 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
735 &net->sctp.addr_waitq);
736
737 list_del(&addrw->list);
738 kfree(addrw);
739 }
740 spin_unlock_bh(&net->sctp.addr_wq_lock);
741 return;
742 }
743
744 /* OK, we have to add the new address to the wait queue */
745 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
746 if (addrw == NULL) {
747 spin_unlock_bh(&net->sctp.addr_wq_lock);
748 return;
749 }
750 addrw->state = cmd;
751 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
752
753 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
754 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
755
756 if (!timer_pending(&net->sctp.addr_wq_timer)) {
757 timeo_val = jiffies;
758 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
759 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
760 }
761 spin_unlock_bh(&net->sctp.addr_wq_lock);
762}
763
764/* Event handler for inet address addition/deletion events.
765 * The sctp_local_addr_list needs to be protocted by a spin lock since
766 * multiple notifiers (say IPv4 and IPv6) may be running at the same
767 * time and thus corrupt the list.
768 * The reader side is protected with RCU.
769 */
770static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
771 void *ptr)
772{
773 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
774 struct sctp_sockaddr_entry *addr = NULL;
775 struct sctp_sockaddr_entry *temp;
776 struct net *net = dev_net(ifa->ifa_dev->dev);
777 int found = 0;
778
779 switch (ev) {
780 case NETDEV_UP:
781 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
782 if (addr) {
783 addr->a.v4.sin_family = AF_INET;
784 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
785 addr->valid = 1;
786 spin_lock_bh(&net->sctp.local_addr_lock);
787 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
788 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
789 spin_unlock_bh(&net->sctp.local_addr_lock);
790 }
791 break;
792 case NETDEV_DOWN:
793 spin_lock_bh(&net->sctp.local_addr_lock);
794 list_for_each_entry_safe(addr, temp,
795 &net->sctp.local_addr_list, list) {
796 if (addr->a.sa.sa_family == AF_INET &&
797 addr->a.v4.sin_addr.s_addr ==
798 ifa->ifa_local) {
799 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
800 found = 1;
801 addr->valid = 0;
802 list_del_rcu(&addr->list);
803 break;
804 }
805 }
806 spin_unlock_bh(&net->sctp.local_addr_lock);
807 if (found)
808 kfree_rcu(addr, rcu);
809 break;
810 }
811
812 return NOTIFY_DONE;
813}
814
815/*
816 * Initialize the control inode/socket with a control endpoint data
817 * structure. This endpoint is reserved exclusively for the OOTB processing.
818 */
819static int sctp_ctl_sock_init(struct net *net)
820{
821 int err;
822 sa_family_t family = PF_INET;
823
824 if (sctp_get_pf_specific(PF_INET6))
825 family = PF_INET6;
826
827 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
828 SOCK_SEQPACKET, IPPROTO_SCTP, net);
829
830 /* If IPv6 socket could not be created, try the IPv4 socket */
831 if (err < 0 && family == PF_INET6)
832 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
833 SOCK_SEQPACKET, IPPROTO_SCTP,
834 net);
835
836 if (err < 0) {
837 pr_err("Failed to create the SCTP control socket\n");
838 return err;
839 }
840 return 0;
841}
842
843/* Register address family specific functions. */
844int sctp_register_af(struct sctp_af *af)
845{
846 switch (af->sa_family) {
847 case AF_INET:
848 if (sctp_af_v4_specific)
849 return 0;
850 sctp_af_v4_specific = af;
851 break;
852 case AF_INET6:
853 if (sctp_af_v6_specific)
854 return 0;
855 sctp_af_v6_specific = af;
856 break;
857 default:
858 return 0;
859 }
860
861 INIT_LIST_HEAD(&af->list);
862 list_add_tail(&af->list, &sctp_address_families);
863 return 1;
864}
865
866/* Get the table of functions for manipulating a particular address
867 * family.
868 */
869struct sctp_af *sctp_get_af_specific(sa_family_t family)
870{
871 switch (family) {
872 case AF_INET:
873 return sctp_af_v4_specific;
874 case AF_INET6:
875 return sctp_af_v6_specific;
876 default:
877 return NULL;
878 }
879}
880
881/* Common code to initialize a AF_INET msg_name. */
882static void sctp_inet_msgname(char *msgname, int *addr_len)
883{
884 struct sockaddr_in *sin;
885
886 sin = (struct sockaddr_in *)msgname;
887 *addr_len = sizeof(struct sockaddr_in);
888 sin->sin_family = AF_INET;
889 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
890}
891
892/* Copy the primary address of the peer primary address as the msg_name. */
893static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
894 int *addr_len)
895{
896 struct sockaddr_in *sin, *sinfrom;
897
898 if (msgname) {
899 struct sctp_association *asoc;
900
901 asoc = event->asoc;
902 sctp_inet_msgname(msgname, addr_len);
903 sin = (struct sockaddr_in *)msgname;
904 sinfrom = &asoc->peer.primary_addr.v4;
905 sin->sin_port = htons(asoc->peer.port);
906 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
907 }
908}
909
910/* Initialize and copy out a msgname from an inbound skb. */
911static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
912{
913 if (msgname) {
914 struct sctphdr *sh = sctp_hdr(skb);
915 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
916
917 sctp_inet_msgname(msgname, len);
918 sin->sin_port = sh->source;
919 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
920 }
921}
922
923/* Do we support this AF? */
924static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
925{
926 /* PF_INET only supports AF_INET addresses. */
927 return AF_INET == family;
928}
929
930/* Address matching with wildcards allowed. */
931static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
932 const union sctp_addr *addr2,
933 struct sctp_sock *opt)
934{
935 /* PF_INET only supports AF_INET addresses. */
936 if (addr1->sa.sa_family != addr2->sa.sa_family)
937 return 0;
938 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
939 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
940 return 1;
941 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
942 return 1;
943
944 return 0;
945}
946
947/* Verify that provided sockaddr looks bindable. Common verification has
948 * already been taken care of.
949 */
950static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
951{
952 return sctp_v4_available(addr, opt);
953}
954
955/* Verify that sockaddr looks sendable. Common verification has already
956 * been taken care of.
957 */
958static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
959{
960 return 1;
961}
962
963/* Fill in Supported Address Type information for INIT and INIT-ACK
964 * chunks. Returns number of addresses supported.
965 */
966static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
967 __be16 *types)
968{
969 types[0] = SCTP_PARAM_IPV4_ADDRESS;
970 return 1;
971}
972
973/* Wrapper routine that calls the ip transmit routine. */
974static inline int sctp_v4_xmit(struct sk_buff *skb,
975 struct sctp_transport *transport)
976{
977 struct inet_sock *inet = inet_sk(skb->sk);
978 __u8 dscp = inet->tos;
979
980 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
981 skb->len, &transport->fl.u.ip4.saddr,
982 &transport->fl.u.ip4.daddr);
983
984 if (transport->dscp & SCTP_DSCP_SET_MASK)
985 dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
986
987 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
988 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
989
990 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
991
992 return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
993}
994
995static struct sctp_af sctp_af_inet;
996
997static struct sctp_pf sctp_pf_inet = {
998 .event_msgname = sctp_inet_event_msgname,
999 .skb_msgname = sctp_inet_skb_msgname,
1000 .af_supported = sctp_inet_af_supported,
1001 .cmp_addr = sctp_inet_cmp_addr,
1002 .bind_verify = sctp_inet_bind_verify,
1003 .send_verify = sctp_inet_send_verify,
1004 .supported_addrs = sctp_inet_supported_addrs,
1005 .create_accept_sk = sctp_v4_create_accept_sk,
1006 .addr_to_user = sctp_v4_addr_to_user,
1007 .to_sk_saddr = sctp_v4_to_sk_saddr,
1008 .to_sk_daddr = sctp_v4_to_sk_daddr,
1009 .copy_ip_options = sctp_v4_copy_ip_options,
1010 .af = &sctp_af_inet
1011};
1012
1013/* Notifier for inetaddr addition/deletion events. */
1014static struct notifier_block sctp_inetaddr_notifier = {
1015 .notifier_call = sctp_inetaddr_event,
1016};
1017
1018/* Socket operations. */
1019static const struct proto_ops inet_seqpacket_ops = {
1020 .family = PF_INET,
1021 .owner = THIS_MODULE,
1022 .release = inet_release, /* Needs to be wrapped... */
1023 .bind = inet_bind,
1024 .connect = sctp_inet_connect,
1025 .socketpair = sock_no_socketpair,
1026 .accept = inet_accept,
1027 .getname = inet_getname, /* Semantics are different. */
1028 .poll = sctp_poll,
1029 .ioctl = inet_ioctl,
1030 .gettstamp = sock_gettstamp,
1031 .listen = sctp_inet_listen,
1032 .shutdown = inet_shutdown, /* Looks harmless. */
1033 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1034 .getsockopt = sock_common_getsockopt,
1035 .sendmsg = inet_sendmsg,
1036 .recvmsg = inet_recvmsg,
1037 .mmap = sock_no_mmap,
1038 .sendpage = sock_no_sendpage,
1039};
1040
1041/* Registration with AF_INET family. */
1042static struct inet_protosw sctp_seqpacket_protosw = {
1043 .type = SOCK_SEQPACKET,
1044 .protocol = IPPROTO_SCTP,
1045 .prot = &sctp_prot,
1046 .ops = &inet_seqpacket_ops,
1047 .flags = SCTP_PROTOSW_FLAG
1048};
1049static struct inet_protosw sctp_stream_protosw = {
1050 .type = SOCK_STREAM,
1051 .protocol = IPPROTO_SCTP,
1052 .prot = &sctp_prot,
1053 .ops = &inet_seqpacket_ops,
1054 .flags = SCTP_PROTOSW_FLAG
1055};
1056
1057/* Register with IP layer. */
1058static const struct net_protocol sctp_protocol = {
1059 .handler = sctp_rcv,
1060 .err_handler = sctp_v4_err,
1061 .no_policy = 1,
1062 .netns_ok = 1,
1063 .icmp_strict_tag_validation = 1,
1064};
1065
1066/* IPv4 address related functions. */
1067static struct sctp_af sctp_af_inet = {
1068 .sa_family = AF_INET,
1069 .sctp_xmit = sctp_v4_xmit,
1070 .setsockopt = ip_setsockopt,
1071 .getsockopt = ip_getsockopt,
1072 .get_dst = sctp_v4_get_dst,
1073 .get_saddr = sctp_v4_get_saddr,
1074 .copy_addrlist = sctp_v4_copy_addrlist,
1075 .from_skb = sctp_v4_from_skb,
1076 .from_sk = sctp_v4_from_sk,
1077 .from_addr_param = sctp_v4_from_addr_param,
1078 .to_addr_param = sctp_v4_to_addr_param,
1079 .cmp_addr = sctp_v4_cmp_addr,
1080 .addr_valid = sctp_v4_addr_valid,
1081 .inaddr_any = sctp_v4_inaddr_any,
1082 .is_any = sctp_v4_is_any,
1083 .available = sctp_v4_available,
1084 .scope = sctp_v4_scope,
1085 .skb_iif = sctp_v4_skb_iif,
1086 .is_ce = sctp_v4_is_ce,
1087 .seq_dump_addr = sctp_v4_seq_dump_addr,
1088 .ecn_capable = sctp_v4_ecn_capable,
1089 .net_header_len = sizeof(struct iphdr),
1090 .sockaddr_len = sizeof(struct sockaddr_in),
1091 .ip_options_len = sctp_v4_ip_options_len,
1092};
1093
1094struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1095{
1096 switch (family) {
1097 case PF_INET:
1098 return sctp_pf_inet_specific;
1099 case PF_INET6:
1100 return sctp_pf_inet6_specific;
1101 default:
1102 return NULL;
1103 }
1104}
1105
1106/* Register the PF specific function table. */
1107int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1108{
1109 switch (family) {
1110 case PF_INET:
1111 if (sctp_pf_inet_specific)
1112 return 0;
1113 sctp_pf_inet_specific = pf;
1114 break;
1115 case PF_INET6:
1116 if (sctp_pf_inet6_specific)
1117 return 0;
1118 sctp_pf_inet6_specific = pf;
1119 break;
1120 default:
1121 return 0;
1122 }
1123 return 1;
1124}
1125
1126static inline int init_sctp_mibs(struct net *net)
1127{
1128 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1129 if (!net->sctp.sctp_statistics)
1130 return -ENOMEM;
1131 return 0;
1132}
1133
1134static inline void cleanup_sctp_mibs(struct net *net)
1135{
1136 free_percpu(net->sctp.sctp_statistics);
1137}
1138
1139static void sctp_v4_pf_init(void)
1140{
1141 /* Initialize the SCTP specific PF functions. */
1142 sctp_register_pf(&sctp_pf_inet, PF_INET);
1143 sctp_register_af(&sctp_af_inet);
1144}
1145
1146static void sctp_v4_pf_exit(void)
1147{
1148 list_del(&sctp_af_inet.list);
1149}
1150
1151static int sctp_v4_protosw_init(void)
1152{
1153 int rc;
1154
1155 rc = proto_register(&sctp_prot, 1);
1156 if (rc)
1157 return rc;
1158
1159 /* Register SCTP(UDP and TCP style) with socket layer. */
1160 inet_register_protosw(&sctp_seqpacket_protosw);
1161 inet_register_protosw(&sctp_stream_protosw);
1162
1163 return 0;
1164}
1165
1166static void sctp_v4_protosw_exit(void)
1167{
1168 inet_unregister_protosw(&sctp_stream_protosw);
1169 inet_unregister_protosw(&sctp_seqpacket_protosw);
1170 proto_unregister(&sctp_prot);
1171}
1172
1173static int sctp_v4_add_protocol(void)
1174{
1175 /* Register notifier for inet address additions/deletions. */
1176 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1177
1178 /* Register SCTP with inet layer. */
1179 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1180 return -EAGAIN;
1181
1182 return 0;
1183}
1184
1185static void sctp_v4_del_protocol(void)
1186{
1187 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1188 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1189}
1190
1191static int __net_init sctp_defaults_init(struct net *net)
1192{
1193 int status;
1194
1195 /*
1196 * 14. Suggested SCTP Protocol Parameter Values
1197 */
1198 /* The following protocol parameters are RECOMMENDED: */
1199 /* RTO.Initial - 3 seconds */
1200 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1201 /* RTO.Min - 1 second */
1202 net->sctp.rto_min = SCTP_RTO_MIN;
1203 /* RTO.Max - 60 seconds */
1204 net->sctp.rto_max = SCTP_RTO_MAX;
1205 /* RTO.Alpha - 1/8 */
1206 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1207 /* RTO.Beta - 1/4 */
1208 net->sctp.rto_beta = SCTP_RTO_BETA;
1209
1210 /* Valid.Cookie.Life - 60 seconds */
1211 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1212
1213 /* Whether Cookie Preservative is enabled(1) or not(0) */
1214 net->sctp.cookie_preserve_enable = 1;
1215
1216 /* Default sctp sockets to use md5 as their hmac alg */
1217#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1218 net->sctp.sctp_hmac_alg = "md5";
1219#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1220 net->sctp.sctp_hmac_alg = "sha1";
1221#else
1222 net->sctp.sctp_hmac_alg = NULL;
1223#endif
1224
1225 /* Max.Burst - 4 */
1226 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1227
1228 /* Disable of Primary Path Switchover by default */
1229 net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX;
1230
1231 /* Enable pf state by default */
1232 net->sctp.pf_enable = 1;
1233
1234 /* Ignore pf exposure feature by default */
1235 net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET;
1236
1237 /* Association.Max.Retrans - 10 attempts
1238 * Path.Max.Retrans - 5 attempts (per destination address)
1239 * Max.Init.Retransmits - 8 attempts
1240 */
1241 net->sctp.max_retrans_association = 10;
1242 net->sctp.max_retrans_path = 5;
1243 net->sctp.max_retrans_init = 8;
1244
1245 /* Sendbuffer growth - do per-socket accounting */
1246 net->sctp.sndbuf_policy = 0;
1247
1248 /* Rcvbuffer growth - do per-socket accounting */
1249 net->sctp.rcvbuf_policy = 0;
1250
1251 /* HB.interval - 30 seconds */
1252 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1253
1254 /* delayed SACK timeout */
1255 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1256
1257 /* Disable ADDIP by default. */
1258 net->sctp.addip_enable = 0;
1259 net->sctp.addip_noauth = 0;
1260 net->sctp.default_auto_asconf = 0;
1261
1262 /* Enable PR-SCTP by default. */
1263 net->sctp.prsctp_enable = 1;
1264
1265 /* Disable RECONF by default. */
1266 net->sctp.reconf_enable = 0;
1267
1268 /* Disable AUTH by default. */
1269 net->sctp.auth_enable = 0;
1270
1271 /* Enable ECN by default. */
1272 net->sctp.ecn_enable = 1;
1273
1274 /* Set SCOPE policy to enabled */
1275 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1276
1277 /* Set the default rwnd update threshold */
1278 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1279
1280 /* Initialize maximum autoclose timeout. */
1281 net->sctp.max_autoclose = INT_MAX / HZ;
1282
1283 status = sctp_sysctl_net_register(net);
1284 if (status)
1285 goto err_sysctl_register;
1286
1287 /* Allocate and initialise sctp mibs. */
1288 status = init_sctp_mibs(net);
1289 if (status)
1290 goto err_init_mibs;
1291
1292#ifdef CONFIG_PROC_FS
1293 /* Initialize proc fs directory. */
1294 status = sctp_proc_init(net);
1295 if (status)
1296 goto err_init_proc;
1297#endif
1298
1299 sctp_dbg_objcnt_init(net);
1300
1301 /* Initialize the local address list. */
1302 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1303 spin_lock_init(&net->sctp.local_addr_lock);
1304 sctp_get_local_addr_list(net);
1305
1306 /* Initialize the address event list */
1307 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1308 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1309 spin_lock_init(&net->sctp.addr_wq_lock);
1310 net->sctp.addr_wq_timer.expires = 0;
1311 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1312
1313 return 0;
1314
1315#ifdef CONFIG_PROC_FS
1316err_init_proc:
1317 cleanup_sctp_mibs(net);
1318#endif
1319err_init_mibs:
1320 sctp_sysctl_net_unregister(net);
1321err_sysctl_register:
1322 return status;
1323}
1324
1325static void __net_exit sctp_defaults_exit(struct net *net)
1326{
1327 /* Free the local address list */
1328 sctp_free_addr_wq(net);
1329 sctp_free_local_addr_list(net);
1330
1331#ifdef CONFIG_PROC_FS
1332 remove_proc_subtree("sctp", net->proc_net);
1333 net->sctp.proc_net_sctp = NULL;
1334#endif
1335 cleanup_sctp_mibs(net);
1336 sctp_sysctl_net_unregister(net);
1337}
1338
1339static struct pernet_operations sctp_defaults_ops = {
1340 .init = sctp_defaults_init,
1341 .exit = sctp_defaults_exit,
1342};
1343
1344static int __net_init sctp_ctrlsock_init(struct net *net)
1345{
1346 int status;
1347
1348 /* Initialize the control inode/socket for handling OOTB packets. */
1349 status = sctp_ctl_sock_init(net);
1350 if (status)
1351 pr_err("Failed to initialize the SCTP control sock\n");
1352
1353 return status;
1354}
1355
1356static void __net_exit sctp_ctrlsock_exit(struct net *net)
1357{
1358 /* Free the control endpoint. */
1359 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1360}
1361
1362static struct pernet_operations sctp_ctrlsock_ops = {
1363 .init = sctp_ctrlsock_init,
1364 .exit = sctp_ctrlsock_exit,
1365};
1366
1367/* Initialize the universe into something sensible. */
1368static __init int sctp_init(void)
1369{
1370 unsigned long nr_pages = totalram_pages();
1371 unsigned long limit;
1372 unsigned long goal;
1373 int max_entry_order;
1374 int num_entries;
1375 int max_share;
1376 int status;
1377 int order;
1378 int i;
1379
1380 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1381
1382 /* Allocate bind_bucket and chunk caches. */
1383 status = -ENOBUFS;
1384 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1385 sizeof(struct sctp_bind_bucket),
1386 0, SLAB_HWCACHE_ALIGN,
1387 NULL);
1388 if (!sctp_bucket_cachep)
1389 goto out;
1390
1391 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1392 sizeof(struct sctp_chunk),
1393 0, SLAB_HWCACHE_ALIGN,
1394 NULL);
1395 if (!sctp_chunk_cachep)
1396 goto err_chunk_cachep;
1397
1398 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1399 if (status)
1400 goto err_percpu_counter_init;
1401
1402 /* Implementation specific variables. */
1403
1404 /* Initialize default stream count setup information. */
1405 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1406 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1407
1408 /* Initialize handle used for association ids. */
1409 idr_init(&sctp_assocs_id);
1410
1411 limit = nr_free_buffer_pages() / 8;
1412 limit = max(limit, 128UL);
1413 sysctl_sctp_mem[0] = limit / 4 * 3;
1414 sysctl_sctp_mem[1] = limit;
1415 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1416
1417 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1418 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1419 max_share = min(4UL*1024*1024, limit);
1420
1421 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1422 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1423 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1424
1425 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1426 sysctl_sctp_wmem[1] = 16*1024;
1427 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1428
1429 /* Size and allocate the association hash table.
1430 * The methodology is similar to that of the tcp hash tables.
1431 * Though not identical. Start by getting a goal size
1432 */
1433 if (nr_pages >= (128 * 1024))
1434 goal = nr_pages >> (22 - PAGE_SHIFT);
1435 else
1436 goal = nr_pages >> (24 - PAGE_SHIFT);
1437
1438 /* Then compute the page order for said goal */
1439 order = get_order(goal);
1440
1441 /* Now compute the required page order for the maximum sized table we
1442 * want to create
1443 */
1444 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1445 sizeof(struct sctp_bind_hashbucket));
1446
1447 /* Limit the page order by that maximum hash table size */
1448 order = min(order, max_entry_order);
1449
1450 /* Allocate and initialize the endpoint hash table. */
1451 sctp_ep_hashsize = 64;
1452 sctp_ep_hashtable =
1453 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1454 if (!sctp_ep_hashtable) {
1455 pr_err("Failed endpoint_hash alloc\n");
1456 status = -ENOMEM;
1457 goto err_ehash_alloc;
1458 }
1459 for (i = 0; i < sctp_ep_hashsize; i++) {
1460 rwlock_init(&sctp_ep_hashtable[i].lock);
1461 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1462 }
1463
1464 /* Allocate and initialize the SCTP port hash table.
1465 * Note that order is initalized to start at the max sized
1466 * table we want to support. If we can't get that many pages
1467 * reduce the order and try again
1468 */
1469 do {
1470 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1471 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1472 } while (!sctp_port_hashtable && --order > 0);
1473
1474 if (!sctp_port_hashtable) {
1475 pr_err("Failed bind hash alloc\n");
1476 status = -ENOMEM;
1477 goto err_bhash_alloc;
1478 }
1479
1480 /* Now compute the number of entries that will fit in the
1481 * port hash space we allocated
1482 */
1483 num_entries = (1UL << order) * PAGE_SIZE /
1484 sizeof(struct sctp_bind_hashbucket);
1485
1486 /* And finish by rounding it down to the nearest power of two
1487 * this wastes some memory of course, but its needed because
1488 * the hash function operates based on the assumption that
1489 * that the number of entries is a power of two
1490 */
1491 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1492
1493 for (i = 0; i < sctp_port_hashsize; i++) {
1494 spin_lock_init(&sctp_port_hashtable[i].lock);
1495 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1496 }
1497
1498 status = sctp_transport_hashtable_init();
1499 if (status)
1500 goto err_thash_alloc;
1501
1502 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1503 num_entries);
1504
1505 sctp_sysctl_register();
1506
1507 INIT_LIST_HEAD(&sctp_address_families);
1508 sctp_v4_pf_init();
1509 sctp_v6_pf_init();
1510 sctp_sched_ops_init();
1511
1512 status = register_pernet_subsys(&sctp_defaults_ops);
1513 if (status)
1514 goto err_register_defaults;
1515
1516 status = sctp_v4_protosw_init();
1517 if (status)
1518 goto err_protosw_init;
1519
1520 status = sctp_v6_protosw_init();
1521 if (status)
1522 goto err_v6_protosw_init;
1523
1524 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1525 if (status)
1526 goto err_register_ctrlsock;
1527
1528 status = sctp_v4_add_protocol();
1529 if (status)
1530 goto err_add_protocol;
1531
1532 /* Register SCTP with inet6 layer. */
1533 status = sctp_v6_add_protocol();
1534 if (status)
1535 goto err_v6_add_protocol;
1536
1537 if (sctp_offload_init() < 0)
1538 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1539
1540out:
1541 return status;
1542err_v6_add_protocol:
1543 sctp_v4_del_protocol();
1544err_add_protocol:
1545 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1546err_register_ctrlsock:
1547 sctp_v6_protosw_exit();
1548err_v6_protosw_init:
1549 sctp_v4_protosw_exit();
1550err_protosw_init:
1551 unregister_pernet_subsys(&sctp_defaults_ops);
1552err_register_defaults:
1553 sctp_v4_pf_exit();
1554 sctp_v6_pf_exit();
1555 sctp_sysctl_unregister();
1556 free_pages((unsigned long)sctp_port_hashtable,
1557 get_order(sctp_port_hashsize *
1558 sizeof(struct sctp_bind_hashbucket)));
1559err_bhash_alloc:
1560 sctp_transport_hashtable_destroy();
1561err_thash_alloc:
1562 kfree(sctp_ep_hashtable);
1563err_ehash_alloc:
1564 percpu_counter_destroy(&sctp_sockets_allocated);
1565err_percpu_counter_init:
1566 kmem_cache_destroy(sctp_chunk_cachep);
1567err_chunk_cachep:
1568 kmem_cache_destroy(sctp_bucket_cachep);
1569 goto out;
1570}
1571
1572/* Exit handler for the SCTP protocol. */
1573static __exit void sctp_exit(void)
1574{
1575 /* BUG. This should probably do something useful like clean
1576 * up all the remaining associations and all that memory.
1577 */
1578
1579 /* Unregister with inet6/inet layers. */
1580 sctp_v6_del_protocol();
1581 sctp_v4_del_protocol();
1582
1583 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1584
1585 /* Free protosw registrations */
1586 sctp_v6_protosw_exit();
1587 sctp_v4_protosw_exit();
1588
1589 unregister_pernet_subsys(&sctp_defaults_ops);
1590
1591 /* Unregister with socket layer. */
1592 sctp_v6_pf_exit();
1593 sctp_v4_pf_exit();
1594
1595 sctp_sysctl_unregister();
1596
1597 free_pages((unsigned long)sctp_port_hashtable,
1598 get_order(sctp_port_hashsize *
1599 sizeof(struct sctp_bind_hashbucket)));
1600 kfree(sctp_ep_hashtable);
1601 sctp_transport_hashtable_destroy();
1602
1603 percpu_counter_destroy(&sctp_sockets_allocated);
1604
1605 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1606
1607 kmem_cache_destroy(sctp_chunk_cachep);
1608 kmem_cache_destroy(sctp_bucket_cachep);
1609}
1610
1611module_init(sctp_init);
1612module_exit(sctp_exit);
1613
1614/*
1615 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1616 */
1617MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1618MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1619MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1620MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1621module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1622MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1623MODULE_LICENSE("GPL");