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1 /* SCTP kernel reference 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 reference Implementation
10 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
13 * The SCTP reference 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 * The SCTP reference 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 #include <linux/module.h>
50 #include <linux/init.h>
51 #include <linux/netdevice.h>
52 #include <linux/inetdevice.h>
53 #include <linux/seq_file.h>
54 #include <net/protocol.h>
55 #include <net/ip.h>
56 #include <net/ipv6.h>
57 #include <net/sctp/sctp.h>
58 #include <net/addrconf.h>
59 #include <net/inet_common.h>
60 #include <net/inet_ecn.h>
61
62 /* Global data structures. */
63 struct sctp_globals sctp_globals;
64 struct proc_dir_entry *proc_net_sctp;
65 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics);
66
67 struct idr sctp_assocs_id;
68 DEFINE_SPINLOCK(sctp_assocs_id_lock);
69
70 /* This is the global socket data structure used for responding to
71 * the Out-of-the-blue (OOTB) packets. A control sock will be created
72 * for this socket at the initialization time.
73 */
74 static struct socket *sctp_ctl_socket;
75
76 static struct sctp_pf *sctp_pf_inet6_specific;
77 static struct sctp_pf *sctp_pf_inet_specific;
78 static struct sctp_af *sctp_af_v4_specific;
79 static struct sctp_af *sctp_af_v6_specific;
80
81 kmem_cache_t *sctp_chunk_cachep;
82 kmem_cache_t *sctp_bucket_cachep;
83
84 extern int sctp_snmp_proc_init(void);
85 extern int sctp_snmp_proc_exit(void);
86 extern int sctp_eps_proc_init(void);
87 extern int sctp_eps_proc_exit(void);
88 extern int sctp_assocs_proc_init(void);
89 extern int sctp_assocs_proc_exit(void);
90
91 /* Return the address of the control sock. */
92 struct sock *sctp_get_ctl_sock(void)
93 {
94 return sctp_ctl_socket->sk;
95 }
96
97 /* Set up the proc fs entry for the SCTP protocol. */
98 static __init int sctp_proc_init(void)
99 {
100 if (!proc_net_sctp) {
101 struct proc_dir_entry *ent;
102 ent = proc_mkdir("net/sctp", NULL);
103 if (ent) {
104 ent->owner = THIS_MODULE;
105 proc_net_sctp = ent;
106 } else
107 goto out_nomem;
108 }
109
110 if (sctp_snmp_proc_init())
111 goto out_nomem;
112 if (sctp_eps_proc_init())
113 goto out_nomem;
114 if (sctp_assocs_proc_init())
115 goto out_nomem;
116
117 return 0;
118
119 out_nomem:
120 return -ENOMEM;
121 }
122
123 /* Clean up the proc fs entry for the SCTP protocol.
124 * Note: Do not make this __exit as it is used in the init error
125 * path.
126 */
127 static void sctp_proc_exit(void)
128 {
129 sctp_snmp_proc_exit();
130 sctp_eps_proc_exit();
131 sctp_assocs_proc_exit();
132
133 if (proc_net_sctp) {
134 proc_net_sctp = NULL;
135 remove_proc_entry("net/sctp", NULL);
136 }
137 }
138
139 /* Private helper to extract ipv4 address and stash them in
140 * the protocol structure.
141 */
142 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
143 struct net_device *dev)
144 {
145 struct in_device *in_dev;
146 struct in_ifaddr *ifa;
147 struct sctp_sockaddr_entry *addr;
148
149 rcu_read_lock();
150 if ((in_dev = __in_dev_get(dev)) == NULL) {
151 rcu_read_unlock();
152 return;
153 }
154
155 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
156 /* Add the address to the local list. */
157 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
158 if (addr) {
159 addr->a.v4.sin_family = AF_INET;
160 addr->a.v4.sin_port = 0;
161 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
162 list_add_tail(&addr->list, addrlist);
163 }
164 }
165
166 rcu_read_unlock();
167 }
168
169 /* Extract our IP addresses from the system and stash them in the
170 * protocol structure.
171 */
172 static void __sctp_get_local_addr_list(void)
173 {
174 struct net_device *dev;
175 struct list_head *pos;
176 struct sctp_af *af;
177
178 read_lock(&dev_base_lock);
179 for (dev = dev_base; dev; dev = dev->next) {
180 __list_for_each(pos, &sctp_address_families) {
181 af = list_entry(pos, struct sctp_af, list);
182 af->copy_addrlist(&sctp_local_addr_list, dev);
183 }
184 }
185 read_unlock(&dev_base_lock);
186 }
187
188 static void sctp_get_local_addr_list(void)
189 {
190 unsigned long flags;
191
192 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
193 __sctp_get_local_addr_list();
194 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
195 }
196
197 /* Free the existing local addresses. */
198 static void __sctp_free_local_addr_list(void)
199 {
200 struct sctp_sockaddr_entry *addr;
201 struct list_head *pos, *temp;
202
203 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
204 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
205 list_del(pos);
206 kfree(addr);
207 }
208 }
209
210 /* Free the existing local addresses. */
211 static void sctp_free_local_addr_list(void)
212 {
213 unsigned long flags;
214
215 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
216 __sctp_free_local_addr_list();
217 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
218 }
219
220 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
221 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
222 int gfp, int copy_flags)
223 {
224 struct sctp_sockaddr_entry *addr;
225 int error = 0;
226 struct list_head *pos;
227 unsigned long flags;
228
229 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
230 list_for_each(pos, &sctp_local_addr_list) {
231 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
232 if (sctp_in_scope(&addr->a, scope)) {
233 /* Now that the address is in scope, check to see if
234 * the address type is really supported by the local
235 * sock as well as the remote peer.
236 */
237 if ((((AF_INET == addr->a.sa.sa_family) &&
238 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
239 (((AF_INET6 == addr->a.sa.sa_family) &&
240 (copy_flags & SCTP_ADDR6_ALLOWED) &&
241 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
242 error = sctp_add_bind_addr(bp, &addr->a,
243 GFP_ATOMIC);
244 if (error)
245 goto end_copy;
246 }
247 }
248 }
249
250 end_copy:
251 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
252 return error;
253 }
254
255 /* Initialize a sctp_addr from in incoming skb. */
256 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
257 int is_saddr)
258 {
259 void *from;
260 __u16 *port;
261 struct sctphdr *sh;
262
263 port = &addr->v4.sin_port;
264 addr->v4.sin_family = AF_INET;
265
266 sh = (struct sctphdr *) skb->h.raw;
267 if (is_saddr) {
268 *port = ntohs(sh->source);
269 from = &skb->nh.iph->saddr;
270 } else {
271 *port = ntohs(sh->dest);
272 from = &skb->nh.iph->daddr;
273 }
274 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
275 }
276
277 /* Initialize an sctp_addr from a socket. */
278 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
279 {
280 addr->v4.sin_family = AF_INET;
281 addr->v4.sin_port = inet_sk(sk)->num;
282 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
283 }
284
285 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
286 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
287 {
288 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
289 }
290
291 /* Initialize sk->sk_daddr from sctp_addr. */
292 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
293 {
294 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
295 }
296
297 /* Initialize a sctp_addr from an address parameter. */
298 static void sctp_v4_from_addr_param(union sctp_addr *addr,
299 union sctp_addr_param *param,
300 __u16 port, int iif)
301 {
302 addr->v4.sin_family = AF_INET;
303 addr->v4.sin_port = port;
304 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
305 }
306
307 /* Initialize an address parameter from a sctp_addr and return the length
308 * of the address parameter.
309 */
310 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
311 union sctp_addr_param *param)
312 {
313 int length = sizeof(sctp_ipv4addr_param_t);
314
315 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
316 param->v4.param_hdr.length = ntohs(length);
317 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
318
319 return length;
320 }
321
322 /* Initialize a sctp_addr from a dst_entry. */
323 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
324 unsigned short port)
325 {
326 struct rtable *rt = (struct rtable *)dst;
327 saddr->v4.sin_family = AF_INET;
328 saddr->v4.sin_port = port;
329 saddr->v4.sin_addr.s_addr = rt->rt_src;
330 }
331
332 /* Compare two addresses exactly. */
333 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
334 const union sctp_addr *addr2)
335 {
336 if (addr1->sa.sa_family != addr2->sa.sa_family)
337 return 0;
338 if (addr1->v4.sin_port != addr2->v4.sin_port)
339 return 0;
340 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
341 return 0;
342
343 return 1;
344 }
345
346 /* Initialize addr struct to INADDR_ANY. */
347 static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
348 {
349 addr->v4.sin_family = AF_INET;
350 addr->v4.sin_addr.s_addr = INADDR_ANY;
351 addr->v4.sin_port = port;
352 }
353
354 /* Is this a wildcard address? */
355 static int sctp_v4_is_any(const union sctp_addr *addr)
356 {
357 return INADDR_ANY == addr->v4.sin_addr.s_addr;
358 }
359
360 /* This function checks if the address is a valid address to be used for
361 * SCTP binding.
362 *
363 * Output:
364 * Return 0 - If the address is a non-unicast or an illegal address.
365 * Return 1 - If the address is a unicast.
366 */
367 static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
368 {
369 /* Is this a non-unicast address or a unusable SCTP address? */
370 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
371 return 0;
372
373 return 1;
374 }
375
376 /* Should this be available for binding? */
377 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
378 {
379 int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
380
381
382 if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
383 ret != RTN_LOCAL &&
384 !sp->inet.freebind &&
385 !sysctl_ip_nonlocal_bind)
386 return 0;
387
388 return 1;
389 }
390
391 /* Checking the loopback, private and other address scopes as defined in
392 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
393 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
394 *
395 * Level 0 - unusable SCTP addresses
396 * Level 1 - loopback address
397 * Level 2 - link-local addresses
398 * Level 3 - private addresses.
399 * Level 4 - global addresses
400 * For INIT and INIT-ACK address list, let L be the level of
401 * of requested destination address, sender and receiver
402 * SHOULD include all of its addresses with level greater
403 * than or equal to L.
404 */
405 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
406 {
407 sctp_scope_t retval;
408
409 /* Should IPv4 scoping be a sysctl configurable option
410 * so users can turn it off (default on) for certain
411 * unconventional networking environments?
412 */
413
414 /* Check for unusable SCTP addresses. */
415 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
416 retval = SCTP_SCOPE_UNUSABLE;
417 } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
418 retval = SCTP_SCOPE_LOOPBACK;
419 } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
420 retval = SCTP_SCOPE_LINK;
421 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
422 retval = SCTP_SCOPE_PRIVATE;
423 } else {
424 retval = SCTP_SCOPE_GLOBAL;
425 }
426
427 return retval;
428 }
429
430 /* Returns a valid dst cache entry for the given source and destination ip
431 * addresses. If an association is passed, trys to get a dst entry with a
432 * source address that matches an address in the bind address list.
433 */
434 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
435 union sctp_addr *daddr,
436 union sctp_addr *saddr)
437 {
438 struct rtable *rt;
439 struct flowi fl;
440 struct sctp_bind_addr *bp;
441 rwlock_t *addr_lock;
442 struct sctp_sockaddr_entry *laddr;
443 struct list_head *pos;
444 struct dst_entry *dst = NULL;
445 union sctp_addr dst_saddr;
446
447 memset(&fl, 0x0, sizeof(struct flowi));
448 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
449 fl.proto = IPPROTO_SCTP;
450 if (asoc) {
451 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
452 fl.oif = asoc->base.sk->sk_bound_dev_if;
453 }
454 if (saddr)
455 fl.fl4_src = saddr->v4.sin_addr.s_addr;
456
457 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
458 __FUNCTION__, NIPQUAD(fl.fl4_dst),
459 NIPQUAD(fl.fl4_src));
460
461 if (!ip_route_output_key(&rt, &fl)) {
462 dst = &rt->u.dst;
463 }
464
465 /* If there is no association or if a source address is passed, no
466 * more validation is required.
467 */
468 if (!asoc || saddr)
469 goto out;
470
471 bp = &asoc->base.bind_addr;
472 addr_lock = &asoc->base.addr_lock;
473
474 if (dst) {
475 /* Walk through the bind address list and look for a bind
476 * address that matches the source address of the returned dst.
477 */
478 sctp_read_lock(addr_lock);
479 list_for_each(pos, &bp->address_list) {
480 laddr = list_entry(pos, struct sctp_sockaddr_entry,
481 list);
482 sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
483 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
484 goto out_unlock;
485 }
486 sctp_read_unlock(addr_lock);
487
488 /* None of the bound addresses match the source address of the
489 * dst. So release it.
490 */
491 dst_release(dst);
492 dst = NULL;
493 }
494
495 /* Walk through the bind address list and try to get a dst that
496 * matches a bind address as the source address.
497 */
498 sctp_read_lock(addr_lock);
499 list_for_each(pos, &bp->address_list) {
500 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
501
502 if (AF_INET == laddr->a.sa.sa_family) {
503 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
504 if (!ip_route_output_key(&rt, &fl)) {
505 dst = &rt->u.dst;
506 goto out_unlock;
507 }
508 }
509 }
510
511 out_unlock:
512 sctp_read_unlock(addr_lock);
513 out:
514 if (dst)
515 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
516 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
517 else
518 SCTP_DEBUG_PRINTK("NO ROUTE\n");
519
520 return dst;
521 }
522
523 /* For v4, the source address is cached in the route entry(dst). So no need
524 * to cache it separately and hence this is an empty routine.
525 */
526 static void sctp_v4_get_saddr(struct sctp_association *asoc,
527 struct dst_entry *dst,
528 union sctp_addr *daddr,
529 union sctp_addr *saddr)
530 {
531 struct rtable *rt = (struct rtable *)dst;
532
533 if (rt) {
534 saddr->v4.sin_family = AF_INET;
535 saddr->v4.sin_port = asoc->base.bind_addr.port;
536 saddr->v4.sin_addr.s_addr = rt->rt_src;
537 }
538 }
539
540 /* What interface did this skb arrive on? */
541 static int sctp_v4_skb_iif(const struct sk_buff *skb)
542 {
543 return ((struct rtable *)skb->dst)->rt_iif;
544 }
545
546 /* Was this packet marked by Explicit Congestion Notification? */
547 static int sctp_v4_is_ce(const struct sk_buff *skb)
548 {
549 return INET_ECN_is_ce(skb->nh.iph->tos);
550 }
551
552 /* Create and initialize a new sk for the socket returned by accept(). */
553 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
554 struct sctp_association *asoc)
555 {
556 struct inet_sock *inet = inet_sk(sk);
557 struct inet_sock *newinet;
558 struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
559
560 if (!newsk)
561 goto out;
562
563 sock_init_data(NULL, newsk);
564
565 newsk->sk_type = SOCK_STREAM;
566
567 newsk->sk_no_check = sk->sk_no_check;
568 newsk->sk_reuse = sk->sk_reuse;
569 newsk->sk_shutdown = sk->sk_shutdown;
570
571 newsk->sk_destruct = inet_sock_destruct;
572 newsk->sk_family = PF_INET;
573 newsk->sk_protocol = IPPROTO_SCTP;
574 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
575 sock_reset_flag(newsk, SOCK_ZAPPED);
576
577 newinet = inet_sk(newsk);
578
579 /* Initialize sk's sport, dport, rcv_saddr and daddr for
580 * getsockname() and getpeername()
581 */
582 newinet->sport = inet->sport;
583 newinet->saddr = inet->saddr;
584 newinet->rcv_saddr = inet->rcv_saddr;
585 newinet->dport = htons(asoc->peer.port);
586 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
587 newinet->pmtudisc = inet->pmtudisc;
588 newinet->id = 0;
589
590 newinet->uc_ttl = -1;
591 newinet->mc_loop = 1;
592 newinet->mc_ttl = 1;
593 newinet->mc_index = 0;
594 newinet->mc_list = NULL;
595
596 #ifdef INET_REFCNT_DEBUG
597 atomic_inc(&inet_sock_nr);
598 #endif
599
600 if (newsk->sk_prot->init(newsk)) {
601 sk_common_release(newsk);
602 newsk = NULL;
603 }
604
605 out:
606 return newsk;
607 }
608
609 /* Map address, empty for v4 family */
610 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
611 {
612 /* Empty */
613 }
614
615 /* Dump the v4 addr to the seq file. */
616 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
617 {
618 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
619 }
620
621 /* Event handler for inet address addition/deletion events.
622 * Basically, whenever there is an event, we re-build our local address list.
623 */
624 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
625 void *ptr)
626 {
627 unsigned long flags;
628
629 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
630 __sctp_free_local_addr_list();
631 __sctp_get_local_addr_list();
632 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
633
634 return NOTIFY_DONE;
635 }
636
637 /*
638 * Initialize the control inode/socket with a control endpoint data
639 * structure. This endpoint is reserved exclusively for the OOTB processing.
640 */
641 static int sctp_ctl_sock_init(void)
642 {
643 int err;
644 sa_family_t family;
645
646 if (sctp_get_pf_specific(PF_INET6))
647 family = PF_INET6;
648 else
649 family = PF_INET;
650
651 err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
652 &sctp_ctl_socket);
653 if (err < 0) {
654 printk(KERN_ERR
655 "SCTP: Failed to create the SCTP control socket.\n");
656 return err;
657 }
658 sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
659 inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
660
661 return 0;
662 }
663
664 /* Register address family specific functions. */
665 int sctp_register_af(struct sctp_af *af)
666 {
667 switch (af->sa_family) {
668 case AF_INET:
669 if (sctp_af_v4_specific)
670 return 0;
671 sctp_af_v4_specific = af;
672 break;
673 case AF_INET6:
674 if (sctp_af_v6_specific)
675 return 0;
676 sctp_af_v6_specific = af;
677 break;
678 default:
679 return 0;
680 }
681
682 INIT_LIST_HEAD(&af->list);
683 list_add_tail(&af->list, &sctp_address_families);
684 return 1;
685 }
686
687 /* Get the table of functions for manipulating a particular address
688 * family.
689 */
690 struct sctp_af *sctp_get_af_specific(sa_family_t family)
691 {
692 switch (family) {
693 case AF_INET:
694 return sctp_af_v4_specific;
695 case AF_INET6:
696 return sctp_af_v6_specific;
697 default:
698 return NULL;
699 }
700 }
701
702 /* Common code to initialize a AF_INET msg_name. */
703 static void sctp_inet_msgname(char *msgname, int *addr_len)
704 {
705 struct sockaddr_in *sin;
706
707 sin = (struct sockaddr_in *)msgname;
708 *addr_len = sizeof(struct sockaddr_in);
709 sin->sin_family = AF_INET;
710 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
711 }
712
713 /* Copy the primary address of the peer primary address as the msg_name. */
714 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
715 int *addr_len)
716 {
717 struct sockaddr_in *sin, *sinfrom;
718
719 if (msgname) {
720 struct sctp_association *asoc;
721
722 asoc = event->asoc;
723 sctp_inet_msgname(msgname, addr_len);
724 sin = (struct sockaddr_in *)msgname;
725 sinfrom = &asoc->peer.primary_addr.v4;
726 sin->sin_port = htons(asoc->peer.port);
727 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
728 }
729 }
730
731 /* Initialize and copy out a msgname from an inbound skb. */
732 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
733 {
734 struct sctphdr *sh;
735 struct sockaddr_in *sin;
736
737 if (msgname) {
738 sctp_inet_msgname(msgname, len);
739 sin = (struct sockaddr_in *)msgname;
740 sh = (struct sctphdr *)skb->h.raw;
741 sin->sin_port = sh->source;
742 sin->sin_addr.s_addr = skb->nh.iph->saddr;
743 }
744 }
745
746 /* Do we support this AF? */
747 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
748 {
749 /* PF_INET only supports AF_INET addresses. */
750 return (AF_INET == family);
751 }
752
753 /* Address matching with wildcards allowed. */
754 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
755 const union sctp_addr *addr2,
756 struct sctp_sock *opt)
757 {
758 /* PF_INET only supports AF_INET addresses. */
759 if (addr1->sa.sa_family != addr2->sa.sa_family)
760 return 0;
761 if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
762 INADDR_ANY == addr2->v4.sin_addr.s_addr)
763 return 1;
764 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
765 return 1;
766
767 return 0;
768 }
769
770 /* Verify that provided sockaddr looks bindable. Common verification has
771 * already been taken care of.
772 */
773 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
774 {
775 return sctp_v4_available(addr, opt);
776 }
777
778 /* Verify that sockaddr looks sendable. Common verification has already
779 * been taken care of.
780 */
781 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
782 {
783 return 1;
784 }
785
786 /* Fill in Supported Address Type information for INIT and INIT-ACK
787 * chunks. Returns number of addresses supported.
788 */
789 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
790 __u16 *types)
791 {
792 types[0] = SCTP_PARAM_IPV4_ADDRESS;
793 return 1;
794 }
795
796 /* Wrapper routine that calls the ip transmit routine. */
797 static inline int sctp_v4_xmit(struct sk_buff *skb,
798 struct sctp_transport *transport, int ipfragok)
799 {
800 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
801 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
802 __FUNCTION__, skb, skb->len,
803 NIPQUAD(((struct rtable *)skb->dst)->rt_src),
804 NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
805
806 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
807 return ip_queue_xmit(skb, ipfragok);
808 }
809
810 static struct sctp_af sctp_ipv4_specific;
811
812 static struct sctp_pf sctp_pf_inet = {
813 .event_msgname = sctp_inet_event_msgname,
814 .skb_msgname = sctp_inet_skb_msgname,
815 .af_supported = sctp_inet_af_supported,
816 .cmp_addr = sctp_inet_cmp_addr,
817 .bind_verify = sctp_inet_bind_verify,
818 .send_verify = sctp_inet_send_verify,
819 .supported_addrs = sctp_inet_supported_addrs,
820 .create_accept_sk = sctp_v4_create_accept_sk,
821 .addr_v4map = sctp_v4_addr_v4map,
822 .af = &sctp_ipv4_specific,
823 };
824
825 /* Notifier for inetaddr addition/deletion events. */
826 static struct notifier_block sctp_inetaddr_notifier = {
827 .notifier_call = sctp_inetaddr_event,
828 };
829
830 /* Socket operations. */
831 static struct proto_ops inet_seqpacket_ops = {
832 .family = PF_INET,
833 .owner = THIS_MODULE,
834 .release = inet_release, /* Needs to be wrapped... */
835 .bind = inet_bind,
836 .connect = inet_dgram_connect,
837 .socketpair = sock_no_socketpair,
838 .accept = inet_accept,
839 .getname = inet_getname, /* Semantics are different. */
840 .poll = sctp_poll,
841 .ioctl = inet_ioctl,
842 .listen = sctp_inet_listen,
843 .shutdown = inet_shutdown, /* Looks harmless. */
844 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem. */
845 .getsockopt = sock_common_getsockopt,
846 .sendmsg = inet_sendmsg,
847 .recvmsg = sock_common_recvmsg,
848 .mmap = sock_no_mmap,
849 .sendpage = sock_no_sendpage,
850 };
851
852 /* Registration with AF_INET family. */
853 static struct inet_protosw sctp_seqpacket_protosw = {
854 .type = SOCK_SEQPACKET,
855 .protocol = IPPROTO_SCTP,
856 .prot = &sctp_prot,
857 .ops = &inet_seqpacket_ops,
858 .capability = -1,
859 .no_check = 0,
860 .flags = SCTP_PROTOSW_FLAG
861 };
862 static struct inet_protosw sctp_stream_protosw = {
863 .type = SOCK_STREAM,
864 .protocol = IPPROTO_SCTP,
865 .prot = &sctp_prot,
866 .ops = &inet_seqpacket_ops,
867 .capability = -1,
868 .no_check = 0,
869 .flags = SCTP_PROTOSW_FLAG
870 };
871
872 /* Register with IP layer. */
873 static struct net_protocol sctp_protocol = {
874 .handler = sctp_rcv,
875 .err_handler = sctp_v4_err,
876 .no_policy = 1,
877 };
878
879 /* IPv4 address related functions. */
880 static struct sctp_af sctp_ipv4_specific = {
881 .sctp_xmit = sctp_v4_xmit,
882 .setsockopt = ip_setsockopt,
883 .getsockopt = ip_getsockopt,
884 .get_dst = sctp_v4_get_dst,
885 .get_saddr = sctp_v4_get_saddr,
886 .copy_addrlist = sctp_v4_copy_addrlist,
887 .from_skb = sctp_v4_from_skb,
888 .from_sk = sctp_v4_from_sk,
889 .to_sk_saddr = sctp_v4_to_sk_saddr,
890 .to_sk_daddr = sctp_v4_to_sk_daddr,
891 .from_addr_param= sctp_v4_from_addr_param,
892 .to_addr_param = sctp_v4_to_addr_param,
893 .dst_saddr = sctp_v4_dst_saddr,
894 .cmp_addr = sctp_v4_cmp_addr,
895 .addr_valid = sctp_v4_addr_valid,
896 .inaddr_any = sctp_v4_inaddr_any,
897 .is_any = sctp_v4_is_any,
898 .available = sctp_v4_available,
899 .scope = sctp_v4_scope,
900 .skb_iif = sctp_v4_skb_iif,
901 .is_ce = sctp_v4_is_ce,
902 .seq_dump_addr = sctp_v4_seq_dump_addr,
903 .net_header_len = sizeof(struct iphdr),
904 .sockaddr_len = sizeof(struct sockaddr_in),
905 .sa_family = AF_INET,
906 };
907
908 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
909
910 switch (family) {
911 case PF_INET:
912 return sctp_pf_inet_specific;
913 case PF_INET6:
914 return sctp_pf_inet6_specific;
915 default:
916 return NULL;
917 }
918 }
919
920 /* Register the PF specific function table. */
921 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
922 {
923 switch (family) {
924 case PF_INET:
925 if (sctp_pf_inet_specific)
926 return 0;
927 sctp_pf_inet_specific = pf;
928 break;
929 case PF_INET6:
930 if (sctp_pf_inet6_specific)
931 return 0;
932 sctp_pf_inet6_specific = pf;
933 break;
934 default:
935 return 0;
936 }
937 return 1;
938 }
939
940 static int __init init_sctp_mibs(void)
941 {
942 sctp_statistics[0] = alloc_percpu(struct sctp_mib);
943 if (!sctp_statistics[0])
944 return -ENOMEM;
945 sctp_statistics[1] = alloc_percpu(struct sctp_mib);
946 if (!sctp_statistics[1]) {
947 free_percpu(sctp_statistics[0]);
948 return -ENOMEM;
949 }
950 return 0;
951
952 }
953
954 static void cleanup_sctp_mibs(void)
955 {
956 free_percpu(sctp_statistics[0]);
957 free_percpu(sctp_statistics[1]);
958 }
959
960 /* Initialize the universe into something sensible. */
961 SCTP_STATIC __init int sctp_init(void)
962 {
963 int i;
964 int status = -EINVAL;
965 unsigned long goal;
966 int order;
967
968 /* SCTP_DEBUG sanity check. */
969 if (!sctp_sanity_check())
970 goto out;
971
972 status = proto_register(&sctp_prot, 1);
973 if (status)
974 goto out;
975
976 /* Add SCTP to inet_protos hash table. */
977 status = -EAGAIN;
978 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
979 goto err_add_protocol;
980
981 /* Add SCTP(TCP and UDP style) to inetsw linked list. */
982 inet_register_protosw(&sctp_seqpacket_protosw);
983 inet_register_protosw(&sctp_stream_protosw);
984
985 /* Allocate a cache pools. */
986 status = -ENOBUFS;
987 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
988 sizeof(struct sctp_bind_bucket),
989 0, SLAB_HWCACHE_ALIGN,
990 NULL, NULL);
991
992 if (!sctp_bucket_cachep)
993 goto err_bucket_cachep;
994
995 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
996 sizeof(struct sctp_chunk),
997 0, SLAB_HWCACHE_ALIGN,
998 NULL, NULL);
999 if (!sctp_chunk_cachep)
1000 goto err_chunk_cachep;
1001
1002 /* Allocate and initialise sctp mibs. */
1003 status = init_sctp_mibs();
1004 if (status)
1005 goto err_init_mibs;
1006
1007 /* Initialize proc fs directory. */
1008 status = sctp_proc_init();
1009 if (status)
1010 goto err_init_proc;
1011
1012 /* Initialize object count debugging. */
1013 sctp_dbg_objcnt_init();
1014
1015 /* Initialize the SCTP specific PF functions. */
1016 sctp_register_pf(&sctp_pf_inet, PF_INET);
1017 /*
1018 * 14. Suggested SCTP Protocol Parameter Values
1019 */
1020 /* The following protocol parameters are RECOMMENDED: */
1021 /* RTO.Initial - 3 seconds */
1022 sctp_rto_initial = SCTP_RTO_INITIAL;
1023 /* RTO.Min - 1 second */
1024 sctp_rto_min = SCTP_RTO_MIN;
1025 /* RTO.Max - 60 seconds */
1026 sctp_rto_max = SCTP_RTO_MAX;
1027 /* RTO.Alpha - 1/8 */
1028 sctp_rto_alpha = SCTP_RTO_ALPHA;
1029 /* RTO.Beta - 1/4 */
1030 sctp_rto_beta = SCTP_RTO_BETA;
1031
1032 /* Valid.Cookie.Life - 60 seconds */
1033 sctp_valid_cookie_life = 60 * HZ;
1034
1035 /* Whether Cookie Preservative is enabled(1) or not(0) */
1036 sctp_cookie_preserve_enable = 1;
1037
1038 /* Max.Burst - 4 */
1039 sctp_max_burst = SCTP_MAX_BURST;
1040
1041 /* Association.Max.Retrans - 10 attempts
1042 * Path.Max.Retrans - 5 attempts (per destination address)
1043 * Max.Init.Retransmits - 8 attempts
1044 */
1045 sctp_max_retrans_association = 10;
1046 sctp_max_retrans_path = 5;
1047 sctp_max_retrans_init = 8;
1048
1049 /* Sendbuffer growth - do per-socket accounting */
1050 sctp_sndbuf_policy = 0;
1051
1052 /* HB.interval - 30 seconds */
1053 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1054
1055 /* delayed SACK timeout */
1056 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1057
1058 /* Implementation specific variables. */
1059
1060 /* Initialize default stream count setup information. */
1061 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1062 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1063
1064 /* Initialize handle used for association ids. */
1065 idr_init(&sctp_assocs_id);
1066
1067 /* Size and allocate the association hash table.
1068 * The methodology is similar to that of the tcp hash tables.
1069 */
1070 if (num_physpages >= (128 * 1024))
1071 goal = num_physpages >> (22 - PAGE_SHIFT);
1072 else
1073 goal = num_physpages >> (24 - PAGE_SHIFT);
1074
1075 for (order = 0; (1UL << order) < goal; order++)
1076 ;
1077
1078 do {
1079 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1080 sizeof(struct sctp_hashbucket);
1081 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1082 continue;
1083 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1084 __get_free_pages(GFP_ATOMIC, order);
1085 } while (!sctp_assoc_hashtable && --order > 0);
1086 if (!sctp_assoc_hashtable) {
1087 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1088 status = -ENOMEM;
1089 goto err_ahash_alloc;
1090 }
1091 for (i = 0; i < sctp_assoc_hashsize; i++) {
1092 rwlock_init(&sctp_assoc_hashtable[i].lock);
1093 sctp_assoc_hashtable[i].chain = NULL;
1094 }
1095
1096 /* Allocate and initialize the endpoint hash table. */
1097 sctp_ep_hashsize = 64;
1098 sctp_ep_hashtable = (struct sctp_hashbucket *)
1099 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1100 if (!sctp_ep_hashtable) {
1101 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1102 status = -ENOMEM;
1103 goto err_ehash_alloc;
1104 }
1105 for (i = 0; i < sctp_ep_hashsize; i++) {
1106 rwlock_init(&sctp_ep_hashtable[i].lock);
1107 sctp_ep_hashtable[i].chain = NULL;
1108 }
1109
1110 /* Allocate and initialize the SCTP port hash table. */
1111 do {
1112 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1113 sizeof(struct sctp_bind_hashbucket);
1114 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1115 continue;
1116 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1117 __get_free_pages(GFP_ATOMIC, order);
1118 } while (!sctp_port_hashtable && --order > 0);
1119 if (!sctp_port_hashtable) {
1120 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1121 status = -ENOMEM;
1122 goto err_bhash_alloc;
1123 }
1124 for (i = 0; i < sctp_port_hashsize; i++) {
1125 spin_lock_init(&sctp_port_hashtable[i].lock);
1126 sctp_port_hashtable[i].chain = NULL;
1127 }
1128
1129 spin_lock_init(&sctp_port_alloc_lock);
1130 sctp_port_rover = sysctl_local_port_range[0] - 1;
1131
1132 printk(KERN_INFO "SCTP: Hash tables configured "
1133 "(established %d bind %d)\n",
1134 sctp_assoc_hashsize, sctp_port_hashsize);
1135
1136 /* Disable ADDIP by default. */
1137 sctp_addip_enable = 0;
1138
1139 /* Enable PR-SCTP by default. */
1140 sctp_prsctp_enable = 1;
1141
1142 sctp_sysctl_register();
1143
1144 INIT_LIST_HEAD(&sctp_address_families);
1145 sctp_register_af(&sctp_ipv4_specific);
1146
1147 status = sctp_v6_init();
1148 if (status)
1149 goto err_v6_init;
1150
1151 /* Initialize the control inode/socket for handling OOTB packets. */
1152 if ((status = sctp_ctl_sock_init())) {
1153 printk (KERN_ERR
1154 "SCTP: Failed to initialize the SCTP control sock.\n");
1155 goto err_ctl_sock_init;
1156 }
1157
1158 /* Initialize the local address list. */
1159 INIT_LIST_HEAD(&sctp_local_addr_list);
1160 spin_lock_init(&sctp_local_addr_lock);
1161
1162 /* Register notifier for inet address additions/deletions. */
1163 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1164
1165 sctp_get_local_addr_list();
1166
1167 __unsafe(THIS_MODULE);
1168 status = 0;
1169 out:
1170 return status;
1171 err_ctl_sock_init:
1172 sctp_v6_exit();
1173 err_v6_init:
1174 sctp_sysctl_unregister();
1175 list_del(&sctp_ipv4_specific.list);
1176 free_pages((unsigned long)sctp_port_hashtable,
1177 get_order(sctp_port_hashsize *
1178 sizeof(struct sctp_bind_hashbucket)));
1179 err_bhash_alloc:
1180 kfree(sctp_ep_hashtable);
1181 err_ehash_alloc:
1182 free_pages((unsigned long)sctp_assoc_hashtable,
1183 get_order(sctp_assoc_hashsize *
1184 sizeof(struct sctp_hashbucket)));
1185 err_ahash_alloc:
1186 sctp_dbg_objcnt_exit();
1187 err_init_proc:
1188 sctp_proc_exit();
1189 cleanup_sctp_mibs();
1190 err_init_mibs:
1191 kmem_cache_destroy(sctp_chunk_cachep);
1192 err_chunk_cachep:
1193 kmem_cache_destroy(sctp_bucket_cachep);
1194 err_bucket_cachep:
1195 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1196 inet_unregister_protosw(&sctp_seqpacket_protosw);
1197 inet_unregister_protosw(&sctp_stream_protosw);
1198 err_add_protocol:
1199 proto_unregister(&sctp_prot);
1200 goto out;
1201 }
1202
1203 /* Exit handler for the SCTP protocol. */
1204 SCTP_STATIC __exit void sctp_exit(void)
1205 {
1206 /* BUG. This should probably do something useful like clean
1207 * up all the remaining associations and all that memory.
1208 */
1209
1210 /* Unregister notifier for inet address additions/deletions. */
1211 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1212
1213 /* Free the local address list. */
1214 sctp_free_local_addr_list();
1215
1216 /* Free the control endpoint. */
1217 sock_release(sctp_ctl_socket);
1218
1219 sctp_v6_exit();
1220 sctp_sysctl_unregister();
1221 list_del(&sctp_ipv4_specific.list);
1222
1223 free_pages((unsigned long)sctp_assoc_hashtable,
1224 get_order(sctp_assoc_hashsize *
1225 sizeof(struct sctp_hashbucket)));
1226 kfree(sctp_ep_hashtable);
1227 free_pages((unsigned long)sctp_port_hashtable,
1228 get_order(sctp_port_hashsize *
1229 sizeof(struct sctp_bind_hashbucket)));
1230
1231 kmem_cache_destroy(sctp_chunk_cachep);
1232 kmem_cache_destroy(sctp_bucket_cachep);
1233
1234 sctp_dbg_objcnt_exit();
1235 sctp_proc_exit();
1236 cleanup_sctp_mibs();
1237
1238 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1239 inet_unregister_protosw(&sctp_seqpacket_protosw);
1240 inet_unregister_protosw(&sctp_stream_protosw);
1241 proto_unregister(&sctp_prot);
1242 }
1243
1244 module_init(sctp_init);
1245 module_exit(sctp_exit);
1246
1247 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1248 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1249 MODULE_LICENSE("GPL");