[SCTP]: Add RCU synchronization around sctp_localaddr_list
[linux-2.6.git] / net / sctp / protocol.c
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/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
62
63 /* Global data structures. */
64 struct sctp_globals sctp_globals __read_mostly;
65 struct proc_dir_entry   *proc_net_sctp;
66 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
67
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
70
71 /* This is the global socket data structure used for responding to
72  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
73  * for this socket at the initialization time.
74  */
75 static struct socket *sctp_ctl_socket;
76
77 static struct sctp_pf *sctp_pf_inet6_specific;
78 static struct sctp_pf *sctp_pf_inet_specific;
79 static struct sctp_af *sctp_af_v4_specific;
80 static struct sctp_af *sctp_af_v6_specific;
81
82 struct kmem_cache *sctp_chunk_cachep __read_mostly;
83 struct kmem_cache *sctp_bucket_cachep __read_mostly;
84
85 /* Return the address of the control sock. */
86 struct sock *sctp_get_ctl_sock(void)
87 {
88         return sctp_ctl_socket->sk;
89 }
90
91 /* Set up the proc fs entry for the SCTP protocol. */
92 static __init int sctp_proc_init(void)
93 {
94         if (!proc_net_sctp) {
95                 struct proc_dir_entry *ent;
96                 ent = proc_mkdir("net/sctp", NULL);
97                 if (ent) {
98                         ent->owner = THIS_MODULE;
99                         proc_net_sctp = ent;
100                 } else
101                         goto out_nomem;
102         }
103
104         if (sctp_snmp_proc_init())
105                 goto out_nomem;
106         if (sctp_eps_proc_init())
107                 goto out_nomem;
108         if (sctp_assocs_proc_init())
109                 goto out_nomem;
110
111         return 0;
112
113 out_nomem:
114         return -ENOMEM;
115 }
116
117 /* Clean up the proc fs entry for the SCTP protocol.
118  * Note: Do not make this __exit as it is used in the init error
119  * path.
120  */
121 static void sctp_proc_exit(void)
122 {
123         sctp_snmp_proc_exit();
124         sctp_eps_proc_exit();
125         sctp_assocs_proc_exit();
126
127         if (proc_net_sctp) {
128                 proc_net_sctp = NULL;
129                 remove_proc_entry("net/sctp", NULL);
130         }
131 }
132
133 /* Private helper to extract ipv4 address and stash them in
134  * the protocol structure.
135  */
136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
137                                   struct net_device *dev)
138 {
139         struct in_device *in_dev;
140         struct in_ifaddr *ifa;
141         struct sctp_sockaddr_entry *addr;
142
143         rcu_read_lock();
144         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
145                 rcu_read_unlock();
146                 return;
147         }
148
149         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
150                 /* Add the address to the local list.  */
151                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
152                 if (addr) {
153                         addr->a.v4.sin_family = AF_INET;
154                         addr->a.v4.sin_port = 0;
155                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
156                         addr->valid = 1;
157                         INIT_LIST_HEAD(&addr->list);
158                         INIT_RCU_HEAD(&addr->rcu);
159                         list_add_tail(&addr->list, addrlist);
160                 }
161         }
162
163         rcu_read_unlock();
164 }
165
166 /* Extract our IP addresses from the system and stash them in the
167  * protocol structure.
168  */
169 static void sctp_get_local_addr_list(void)
170 {
171         struct net_device *dev;
172         struct list_head *pos;
173         struct sctp_af *af;
174
175         read_lock(&dev_base_lock);
176         for_each_netdev(dev) {
177                 __list_for_each(pos, &sctp_address_families) {
178                         af = list_entry(pos, struct sctp_af, list);
179                         af->copy_addrlist(&sctp_local_addr_list, dev);
180                 }
181         }
182         read_unlock(&dev_base_lock);
183 }
184
185 /* Free the existing local addresses.  */
186 static void sctp_free_local_addr_list(void)
187 {
188         struct sctp_sockaddr_entry *addr;
189         struct list_head *pos, *temp;
190
191         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
192                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
193                 list_del(pos);
194                 kfree(addr);
195         }
196 }
197
198 void sctp_local_addr_free(struct rcu_head *head)
199 {
200         struct sctp_sockaddr_entry *e = container_of(head,
201                                 struct sctp_sockaddr_entry, rcu);
202         kfree(e);
203 }
204
205 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
206 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
207                               gfp_t gfp, int copy_flags)
208 {
209         struct sctp_sockaddr_entry *addr;
210         int error = 0;
211
212         rcu_read_lock();
213         list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
214                 if (!addr->valid)
215                         continue;
216                 if (sctp_in_scope(&addr->a, scope)) {
217                         /* Now that the address is in scope, check to see if
218                          * the address type is really supported by the local
219                          * sock as well as the remote peer.
220                          */
221                         if ((((AF_INET == addr->a.sa.sa_family) &&
222                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
223                             (((AF_INET6 == addr->a.sa.sa_family) &&
224                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
225                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
226                                 error = sctp_add_bind_addr(bp, &addr->a, 1,
227                                                            GFP_ATOMIC);
228                                 if (error)
229                                         goto end_copy;
230                         }
231                 }
232         }
233
234 end_copy:
235         rcu_read_unlock();
236         return error;
237 }
238
239 /* Initialize a sctp_addr from in incoming skb.  */
240 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
241                              int is_saddr)
242 {
243         void *from;
244         __be16 *port;
245         struct sctphdr *sh;
246
247         port = &addr->v4.sin_port;
248         addr->v4.sin_family = AF_INET;
249
250         sh = sctp_hdr(skb);
251         if (is_saddr) {
252                 *port  = sh->source;
253                 from = &ip_hdr(skb)->saddr;
254         } else {
255                 *port = sh->dest;
256                 from = &ip_hdr(skb)->daddr;
257         }
258         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
259 }
260
261 /* Initialize an sctp_addr from a socket. */
262 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
263 {
264         addr->v4.sin_family = AF_INET;
265         addr->v4.sin_port = 0;
266         addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
267 }
268
269 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
270 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
271 {
272         inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
273 }
274
275 /* Initialize sk->sk_daddr from sctp_addr. */
276 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
277 {
278         inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
279 }
280
281 /* Initialize a sctp_addr from an address parameter. */
282 static void sctp_v4_from_addr_param(union sctp_addr *addr,
283                                     union sctp_addr_param *param,
284                                     __be16 port, int iif)
285 {
286         addr->v4.sin_family = AF_INET;
287         addr->v4.sin_port = port;
288         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
289 }
290
291 /* Initialize an address parameter from a sctp_addr and return the length
292  * of the address parameter.
293  */
294 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
295                                  union sctp_addr_param *param)
296 {
297         int length = sizeof(sctp_ipv4addr_param_t);
298
299         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
300         param->v4.param_hdr.length = htons(length);
301         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
302
303         return length;
304 }
305
306 /* Initialize a sctp_addr from a dst_entry. */
307 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
308                               __be16 port)
309 {
310         struct rtable *rt = (struct rtable *)dst;
311         saddr->v4.sin_family = AF_INET;
312         saddr->v4.sin_port = port;
313         saddr->v4.sin_addr.s_addr = rt->rt_src;
314 }
315
316 /* Compare two addresses exactly. */
317 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
318                             const union sctp_addr *addr2)
319 {
320         if (addr1->sa.sa_family != addr2->sa.sa_family)
321                 return 0;
322         if (addr1->v4.sin_port != addr2->v4.sin_port)
323                 return 0;
324         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
325                 return 0;
326
327         return 1;
328 }
329
330 /* Initialize addr struct to INADDR_ANY. */
331 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
332 {
333         addr->v4.sin_family = AF_INET;
334         addr->v4.sin_addr.s_addr = INADDR_ANY;
335         addr->v4.sin_port = port;
336 }
337
338 /* Is this a wildcard address? */
339 static int sctp_v4_is_any(const union sctp_addr *addr)
340 {
341         return INADDR_ANY == addr->v4.sin_addr.s_addr;
342 }
343
344 /* This function checks if the address is a valid address to be used for
345  * SCTP binding.
346  *
347  * Output:
348  * Return 0 - If the address is a non-unicast or an illegal address.
349  * Return 1 - If the address is a unicast.
350  */
351 static int sctp_v4_addr_valid(union sctp_addr *addr,
352                               struct sctp_sock *sp,
353                               const struct sk_buff *skb)
354 {
355         /* Is this a non-unicast address or a unusable SCTP address? */
356         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
357                 return 0;
358
359         /* Is this a broadcast address? */
360         if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
361                 return 0;
362
363         return 1;
364 }
365
366 /* Should this be available for binding?   */
367 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
368 {
369         int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
370
371
372         if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
373            ret != RTN_LOCAL &&
374            !sp->inet.freebind &&
375            !sysctl_ip_nonlocal_bind)
376                 return 0;
377
378         return 1;
379 }
380
381 /* Checking the loopback, private and other address scopes as defined in
382  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
383  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
384  *
385  * Level 0 - unusable SCTP addresses
386  * Level 1 - loopback address
387  * Level 2 - link-local addresses
388  * Level 3 - private addresses.
389  * Level 4 - global addresses
390  * For INIT and INIT-ACK address list, let L be the level of
391  * of requested destination address, sender and receiver
392  * SHOULD include all of its addresses with level greater
393  * than or equal to L.
394  */
395 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
396 {
397         sctp_scope_t retval;
398
399         /* Should IPv4 scoping be a sysctl configurable option
400          * so users can turn it off (default on) for certain
401          * unconventional networking environments?
402          */
403
404         /* Check for unusable SCTP addresses. */
405         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
406                 retval =  SCTP_SCOPE_UNUSABLE;
407         } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
408                 retval = SCTP_SCOPE_LOOPBACK;
409         } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
410                 retval = SCTP_SCOPE_LINK;
411         } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
412                 retval = SCTP_SCOPE_PRIVATE;
413         } else {
414                 retval = SCTP_SCOPE_GLOBAL;
415         }
416
417         return retval;
418 }
419
420 /* Returns a valid dst cache entry for the given source and destination ip
421  * addresses. If an association is passed, trys to get a dst entry with a
422  * source address that matches an address in the bind address list.
423  */
424 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
425                                          union sctp_addr *daddr,
426                                          union sctp_addr *saddr)
427 {
428         struct rtable *rt;
429         struct flowi fl;
430         struct sctp_bind_addr *bp;
431         rwlock_t *addr_lock;
432         struct sctp_sockaddr_entry *laddr;
433         struct list_head *pos;
434         struct dst_entry *dst = NULL;
435         union sctp_addr dst_saddr;
436
437         memset(&fl, 0x0, sizeof(struct flowi));
438         fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
439         fl.proto = IPPROTO_SCTP;
440         if (asoc) {
441                 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
442                 fl.oif = asoc->base.sk->sk_bound_dev_if;
443         }
444         if (saddr)
445                 fl.fl4_src = saddr->v4.sin_addr.s_addr;
446
447         SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
448                           __FUNCTION__, NIPQUAD(fl.fl4_dst),
449                           NIPQUAD(fl.fl4_src));
450
451         if (!ip_route_output_key(&rt, &fl)) {
452                 dst = &rt->u.dst;
453         }
454
455         /* If there is no association or if a source address is passed, no
456          * more validation is required.
457          */
458         if (!asoc || saddr)
459                 goto out;
460
461         bp = &asoc->base.bind_addr;
462         addr_lock = &asoc->base.addr_lock;
463
464         if (dst) {
465                 /* Walk through the bind address list and look for a bind
466                  * address that matches the source address of the returned dst.
467                  */
468                 sctp_read_lock(addr_lock);
469                 list_for_each(pos, &bp->address_list) {
470                         laddr = list_entry(pos, struct sctp_sockaddr_entry,
471                                            list);
472                         if (!laddr->use_as_src)
473                                 continue;
474                         sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
475                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
476                                 goto out_unlock;
477                 }
478                 sctp_read_unlock(addr_lock);
479
480                 /* None of the bound addresses match the source address of the
481                  * dst. So release it.
482                  */
483                 dst_release(dst);
484                 dst = NULL;
485         }
486
487         /* Walk through the bind address list and try to get a dst that
488          * matches a bind address as the source address.
489          */
490         sctp_read_lock(addr_lock);
491         list_for_each(pos, &bp->address_list) {
492                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
493
494                 if ((laddr->use_as_src) &&
495                     (AF_INET == laddr->a.sa.sa_family)) {
496                         fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
497                         if (!ip_route_output_key(&rt, &fl)) {
498                                 dst = &rt->u.dst;
499                                 goto out_unlock;
500                         }
501                 }
502         }
503
504 out_unlock:
505         sctp_read_unlock(addr_lock);
506 out:
507         if (dst)
508                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
509                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
510         else
511                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
512
513         return dst;
514 }
515
516 /* For v4, the source address is cached in the route entry(dst). So no need
517  * to cache it separately and hence this is an empty routine.
518  */
519 static void sctp_v4_get_saddr(struct sctp_association *asoc,
520                               struct dst_entry *dst,
521                               union sctp_addr *daddr,
522                               union sctp_addr *saddr)
523 {
524         struct rtable *rt = (struct rtable *)dst;
525
526         if (!asoc)
527                 return;
528
529         if (rt) {
530                 saddr->v4.sin_family = AF_INET;
531                 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
532                 saddr->v4.sin_addr.s_addr = rt->rt_src;
533         }
534 }
535
536 /* What interface did this skb arrive on? */
537 static int sctp_v4_skb_iif(const struct sk_buff *skb)
538 {
539         return ((struct rtable *)skb->dst)->rt_iif;
540 }
541
542 /* Was this packet marked by Explicit Congestion Notification? */
543 static int sctp_v4_is_ce(const struct sk_buff *skb)
544 {
545         return INET_ECN_is_ce(ip_hdr(skb)->tos);
546 }
547
548 /* Create and initialize a new sk for the socket returned by accept(). */
549 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
550                                              struct sctp_association *asoc)
551 {
552         struct inet_sock *inet = inet_sk(sk);
553         struct inet_sock *newinet;
554         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
555
556         if (!newsk)
557                 goto out;
558
559         sock_init_data(NULL, newsk);
560
561         newsk->sk_type = SOCK_STREAM;
562
563         newsk->sk_no_check = sk->sk_no_check;
564         newsk->sk_reuse = sk->sk_reuse;
565         newsk->sk_shutdown = sk->sk_shutdown;
566
567         newsk->sk_destruct = inet_sock_destruct;
568         newsk->sk_family = PF_INET;
569         newsk->sk_protocol = IPPROTO_SCTP;
570         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
571         sock_reset_flag(newsk, SOCK_ZAPPED);
572
573         newinet = inet_sk(newsk);
574
575         /* Initialize sk's sport, dport, rcv_saddr and daddr for
576          * getsockname() and getpeername()
577          */
578         newinet->sport = inet->sport;
579         newinet->saddr = inet->saddr;
580         newinet->rcv_saddr = inet->rcv_saddr;
581         newinet->dport = htons(asoc->peer.port);
582         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
583         newinet->pmtudisc = inet->pmtudisc;
584         newinet->id = asoc->next_tsn ^ jiffies;
585
586         newinet->uc_ttl = -1;
587         newinet->mc_loop = 1;
588         newinet->mc_ttl = 1;
589         newinet->mc_index = 0;
590         newinet->mc_list = NULL;
591
592         sk_refcnt_debug_inc(newsk);
593
594         if (newsk->sk_prot->init(newsk)) {
595                 sk_common_release(newsk);
596                 newsk = NULL;
597         }
598
599 out:
600         return newsk;
601 }
602
603 /* Map address, empty for v4 family */
604 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
605 {
606         /* Empty */
607 }
608
609 /* Dump the v4 addr to the seq file. */
610 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
611 {
612         seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
613 }
614
615 /* Event handler for inet address addition/deletion events.
616  * The sctp_local_addr_list needs to be protocted by a spin lock since
617  * multiple notifiers (say IPv4 and IPv6) may be running at the same
618  * time and thus corrupt the list.
619  * The reader side is protected with RCU.
620  */
621 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
622                                void *ptr)
623 {
624         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
625         struct sctp_sockaddr_entry *addr = NULL;
626         struct sctp_sockaddr_entry *temp;
627
628         switch (ev) {
629         case NETDEV_UP:
630                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
631                 if (addr) {
632                         addr->a.v4.sin_family = AF_INET;
633                         addr->a.v4.sin_port = 0;
634                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
635                         addr->valid = 1;
636                         spin_lock_bh(&sctp_local_addr_lock);
637                         list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
638                         spin_unlock_bh(&sctp_local_addr_lock);
639                 }
640                 break;
641         case NETDEV_DOWN:
642                 spin_lock_bh(&sctp_local_addr_lock);
643                 list_for_each_entry_safe(addr, temp,
644                                         &sctp_local_addr_list, list) {
645                         if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
646                                 addr->valid = 0;
647                                 list_del_rcu(&addr->list);
648                                 break;
649                         }
650                 }
651                 spin_unlock_bh(&sctp_local_addr_lock);
652                 if (addr && !addr->valid)
653                         call_rcu(&addr->rcu, sctp_local_addr_free);
654                 break;
655         }
656
657         return NOTIFY_DONE;
658 }
659
660 /*
661  * Initialize the control inode/socket with a control endpoint data
662  * structure.  This endpoint is reserved exclusively for the OOTB processing.
663  */
664 static int sctp_ctl_sock_init(void)
665 {
666         int err;
667         sa_family_t family;
668
669         if (sctp_get_pf_specific(PF_INET6))
670                 family = PF_INET6;
671         else
672                 family = PF_INET;
673
674         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
675                                &sctp_ctl_socket);
676         if (err < 0) {
677                 printk(KERN_ERR
678                        "SCTP: Failed to create the SCTP control socket.\n");
679                 return err;
680         }
681         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
682         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
683
684         return 0;
685 }
686
687 /* Register address family specific functions. */
688 int sctp_register_af(struct sctp_af *af)
689 {
690         switch (af->sa_family) {
691         case AF_INET:
692                 if (sctp_af_v4_specific)
693                         return 0;
694                 sctp_af_v4_specific = af;
695                 break;
696         case AF_INET6:
697                 if (sctp_af_v6_specific)
698                         return 0;
699                 sctp_af_v6_specific = af;
700                 break;
701         default:
702                 return 0;
703         }
704
705         INIT_LIST_HEAD(&af->list);
706         list_add_tail(&af->list, &sctp_address_families);
707         return 1;
708 }
709
710 /* Get the table of functions for manipulating a particular address
711  * family.
712  */
713 struct sctp_af *sctp_get_af_specific(sa_family_t family)
714 {
715         switch (family) {
716         case AF_INET:
717                 return sctp_af_v4_specific;
718         case AF_INET6:
719                 return sctp_af_v6_specific;
720         default:
721                 return NULL;
722         }
723 }
724
725 /* Common code to initialize a AF_INET msg_name. */
726 static void sctp_inet_msgname(char *msgname, int *addr_len)
727 {
728         struct sockaddr_in *sin;
729
730         sin = (struct sockaddr_in *)msgname;
731         *addr_len = sizeof(struct sockaddr_in);
732         sin->sin_family = AF_INET;
733         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
734 }
735
736 /* Copy the primary address of the peer primary address as the msg_name. */
737 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
738                                     int *addr_len)
739 {
740         struct sockaddr_in *sin, *sinfrom;
741
742         if (msgname) {
743                 struct sctp_association *asoc;
744
745                 asoc = event->asoc;
746                 sctp_inet_msgname(msgname, addr_len);
747                 sin = (struct sockaddr_in *)msgname;
748                 sinfrom = &asoc->peer.primary_addr.v4;
749                 sin->sin_port = htons(asoc->peer.port);
750                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
751         }
752 }
753
754 /* Initialize and copy out a msgname from an inbound skb. */
755 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
756 {
757         if (msgname) {
758                 struct sctphdr *sh = sctp_hdr(skb);
759                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
760
761                 sctp_inet_msgname(msgname, len);
762                 sin->sin_port = sh->source;
763                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
764         }
765 }
766
767 /* Do we support this AF? */
768 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
769 {
770         /* PF_INET only supports AF_INET addresses. */
771         return (AF_INET == family);
772 }
773
774 /* Address matching with wildcards allowed. */
775 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
776                               const union sctp_addr *addr2,
777                               struct sctp_sock *opt)
778 {
779         /* PF_INET only supports AF_INET addresses. */
780         if (addr1->sa.sa_family != addr2->sa.sa_family)
781                 return 0;
782         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
783             INADDR_ANY == addr2->v4.sin_addr.s_addr)
784                 return 1;
785         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
786                 return 1;
787
788         return 0;
789 }
790
791 /* Verify that provided sockaddr looks bindable.  Common verification has
792  * already been taken care of.
793  */
794 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
795 {
796         return sctp_v4_available(addr, opt);
797 }
798
799 /* Verify that sockaddr looks sendable.  Common verification has already
800  * been taken care of.
801  */
802 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
803 {
804         return 1;
805 }
806
807 /* Fill in Supported Address Type information for INIT and INIT-ACK
808  * chunks.  Returns number of addresses supported.
809  */
810 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
811                                      __be16 *types)
812 {
813         types[0] = SCTP_PARAM_IPV4_ADDRESS;
814         return 1;
815 }
816
817 /* Wrapper routine that calls the ip transmit routine. */
818 static inline int sctp_v4_xmit(struct sk_buff *skb,
819                                struct sctp_transport *transport, int ipfragok)
820 {
821         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
822                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
823                           __FUNCTION__, skb, skb->len,
824                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
825                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
826
827         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
828         return ip_queue_xmit(skb, ipfragok);
829 }
830
831 static struct sctp_af sctp_ipv4_specific;
832
833 static struct sctp_pf sctp_pf_inet = {
834         .event_msgname = sctp_inet_event_msgname,
835         .skb_msgname   = sctp_inet_skb_msgname,
836         .af_supported  = sctp_inet_af_supported,
837         .cmp_addr      = sctp_inet_cmp_addr,
838         .bind_verify   = sctp_inet_bind_verify,
839         .send_verify   = sctp_inet_send_verify,
840         .supported_addrs = sctp_inet_supported_addrs,
841         .create_accept_sk = sctp_v4_create_accept_sk,
842         .addr_v4map     = sctp_v4_addr_v4map,
843         .af            = &sctp_ipv4_specific,
844 };
845
846 /* Notifier for inetaddr addition/deletion events.  */
847 static struct notifier_block sctp_inetaddr_notifier = {
848         .notifier_call = sctp_inetaddr_event,
849 };
850
851 /* Socket operations.  */
852 static const struct proto_ops inet_seqpacket_ops = {
853         .family            = PF_INET,
854         .owner             = THIS_MODULE,
855         .release           = inet_release,      /* Needs to be wrapped... */
856         .bind              = inet_bind,
857         .connect           = inet_dgram_connect,
858         .socketpair        = sock_no_socketpair,
859         .accept            = inet_accept,
860         .getname           = inet_getname,      /* Semantics are different.  */
861         .poll              = sctp_poll,
862         .ioctl             = inet_ioctl,
863         .listen            = sctp_inet_listen,
864         .shutdown          = inet_shutdown,     /* Looks harmless.  */
865         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
866         .getsockopt        = sock_common_getsockopt,
867         .sendmsg           = inet_sendmsg,
868         .recvmsg           = sock_common_recvmsg,
869         .mmap              = sock_no_mmap,
870         .sendpage          = sock_no_sendpage,
871 #ifdef CONFIG_COMPAT
872         .compat_setsockopt = compat_sock_common_setsockopt,
873         .compat_getsockopt = compat_sock_common_getsockopt,
874 #endif
875 };
876
877 /* Registration with AF_INET family.  */
878 static struct inet_protosw sctp_seqpacket_protosw = {
879         .type       = SOCK_SEQPACKET,
880         .protocol   = IPPROTO_SCTP,
881         .prot       = &sctp_prot,
882         .ops        = &inet_seqpacket_ops,
883         .capability = -1,
884         .no_check   = 0,
885         .flags      = SCTP_PROTOSW_FLAG
886 };
887 static struct inet_protosw sctp_stream_protosw = {
888         .type       = SOCK_STREAM,
889         .protocol   = IPPROTO_SCTP,
890         .prot       = &sctp_prot,
891         .ops        = &inet_seqpacket_ops,
892         .capability = -1,
893         .no_check   = 0,
894         .flags      = SCTP_PROTOSW_FLAG
895 };
896
897 /* Register with IP layer.  */
898 static struct net_protocol sctp_protocol = {
899         .handler     = sctp_rcv,
900         .err_handler = sctp_v4_err,
901         .no_policy   = 1,
902 };
903
904 /* IPv4 address related functions.  */
905 static struct sctp_af sctp_ipv4_specific = {
906         .sa_family         = AF_INET,
907         .sctp_xmit         = sctp_v4_xmit,
908         .setsockopt        = ip_setsockopt,
909         .getsockopt        = ip_getsockopt,
910         .get_dst           = sctp_v4_get_dst,
911         .get_saddr         = sctp_v4_get_saddr,
912         .copy_addrlist     = sctp_v4_copy_addrlist,
913         .from_skb          = sctp_v4_from_skb,
914         .from_sk           = sctp_v4_from_sk,
915         .to_sk_saddr       = sctp_v4_to_sk_saddr,
916         .to_sk_daddr       = sctp_v4_to_sk_daddr,
917         .from_addr_param   = sctp_v4_from_addr_param,
918         .to_addr_param     = sctp_v4_to_addr_param,
919         .dst_saddr         = sctp_v4_dst_saddr,
920         .cmp_addr          = sctp_v4_cmp_addr,
921         .addr_valid        = sctp_v4_addr_valid,
922         .inaddr_any        = sctp_v4_inaddr_any,
923         .is_any            = sctp_v4_is_any,
924         .available         = sctp_v4_available,
925         .scope             = sctp_v4_scope,
926         .skb_iif           = sctp_v4_skb_iif,
927         .is_ce             = sctp_v4_is_ce,
928         .seq_dump_addr     = sctp_v4_seq_dump_addr,
929         .net_header_len    = sizeof(struct iphdr),
930         .sockaddr_len      = sizeof(struct sockaddr_in),
931 #ifdef CONFIG_COMPAT
932         .compat_setsockopt = compat_ip_setsockopt,
933         .compat_getsockopt = compat_ip_getsockopt,
934 #endif
935 };
936
937 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
938
939         switch (family) {
940         case PF_INET:
941                 return sctp_pf_inet_specific;
942         case PF_INET6:
943                 return sctp_pf_inet6_specific;
944         default:
945                 return NULL;
946         }
947 }
948
949 /* Register the PF specific function table.  */
950 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
951 {
952         switch (family) {
953         case PF_INET:
954                 if (sctp_pf_inet_specific)
955                         return 0;
956                 sctp_pf_inet_specific = pf;
957                 break;
958         case PF_INET6:
959                 if (sctp_pf_inet6_specific)
960                         return 0;
961                 sctp_pf_inet6_specific = pf;
962                 break;
963         default:
964                 return 0;
965         }
966         return 1;
967 }
968
969 static int __init init_sctp_mibs(void)
970 {
971         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
972         if (!sctp_statistics[0])
973                 return -ENOMEM;
974         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
975         if (!sctp_statistics[1]) {
976                 free_percpu(sctp_statistics[0]);
977                 return -ENOMEM;
978         }
979         return 0;
980
981 }
982
983 static void cleanup_sctp_mibs(void)
984 {
985         free_percpu(sctp_statistics[0]);
986         free_percpu(sctp_statistics[1]);
987 }
988
989 /* Initialize the universe into something sensible.  */
990 SCTP_STATIC __init int sctp_init(void)
991 {
992         int i;
993         int status = -EINVAL;
994         unsigned long goal;
995         int order;
996
997         /* SCTP_DEBUG sanity check. */
998         if (!sctp_sanity_check())
999                 goto out;
1000
1001         /* Allocate bind_bucket and chunk caches. */
1002         status = -ENOBUFS;
1003         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1004                                                sizeof(struct sctp_bind_bucket),
1005                                                0, SLAB_HWCACHE_ALIGN,
1006                                                NULL);
1007         if (!sctp_bucket_cachep)
1008                 goto out;
1009
1010         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1011                                                sizeof(struct sctp_chunk),
1012                                                0, SLAB_HWCACHE_ALIGN,
1013                                                NULL);
1014         if (!sctp_chunk_cachep)
1015                 goto err_chunk_cachep;
1016
1017         /* Allocate and initialise sctp mibs.  */
1018         status = init_sctp_mibs();
1019         if (status)
1020                 goto err_init_mibs;
1021
1022         /* Initialize proc fs directory.  */
1023         status = sctp_proc_init();
1024         if (status)
1025                 goto err_init_proc;
1026
1027         /* Initialize object count debugging.  */
1028         sctp_dbg_objcnt_init();
1029
1030         /* Initialize the SCTP specific PF functions. */
1031         sctp_register_pf(&sctp_pf_inet, PF_INET);
1032         /*
1033          * 14. Suggested SCTP Protocol Parameter Values
1034          */
1035         /* The following protocol parameters are RECOMMENDED:  */
1036         /* RTO.Initial              - 3  seconds */
1037         sctp_rto_initial                = SCTP_RTO_INITIAL;
1038         /* RTO.Min                  - 1  second */
1039         sctp_rto_min                    = SCTP_RTO_MIN;
1040         /* RTO.Max                 -  60 seconds */
1041         sctp_rto_max                    = SCTP_RTO_MAX;
1042         /* RTO.Alpha                - 1/8 */
1043         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1044         /* RTO.Beta                 - 1/4 */
1045         sctp_rto_beta                   = SCTP_RTO_BETA;
1046
1047         /* Valid.Cookie.Life        - 60  seconds */
1048         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1049
1050         /* Whether Cookie Preservative is enabled(1) or not(0) */
1051         sctp_cookie_preserve_enable     = 1;
1052
1053         /* Max.Burst                - 4 */
1054         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1055
1056         /* Association.Max.Retrans  - 10 attempts
1057          * Path.Max.Retrans         - 5  attempts (per destination address)
1058          * Max.Init.Retransmits     - 8  attempts
1059          */
1060         sctp_max_retrans_association    = 10;
1061         sctp_max_retrans_path           = 5;
1062         sctp_max_retrans_init           = 8;
1063
1064         /* Sendbuffer growth        - do per-socket accounting */
1065         sctp_sndbuf_policy              = 0;
1066
1067         /* Rcvbuffer growth         - do per-socket accounting */
1068         sctp_rcvbuf_policy              = 0;
1069
1070         /* HB.interval              - 30 seconds */
1071         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1072
1073         /* delayed SACK timeout */
1074         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1075
1076         /* Implementation specific variables. */
1077
1078         /* Initialize default stream count setup information. */
1079         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1080         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1081
1082         /* Initialize handle used for association ids. */
1083         idr_init(&sctp_assocs_id);
1084
1085         /* Size and allocate the association hash table.
1086          * The methodology is similar to that of the tcp hash tables.
1087          */
1088         if (num_physpages >= (128 * 1024))
1089                 goal = num_physpages >> (22 - PAGE_SHIFT);
1090         else
1091                 goal = num_physpages >> (24 - PAGE_SHIFT);
1092
1093         for (order = 0; (1UL << order) < goal; order++)
1094                 ;
1095
1096         do {
1097                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1098                                         sizeof(struct sctp_hashbucket);
1099                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1100                         continue;
1101                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1102                                         __get_free_pages(GFP_ATOMIC, order);
1103         } while (!sctp_assoc_hashtable && --order > 0);
1104         if (!sctp_assoc_hashtable) {
1105                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1106                 status = -ENOMEM;
1107                 goto err_ahash_alloc;
1108         }
1109         for (i = 0; i < sctp_assoc_hashsize; i++) {
1110                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1111                 sctp_assoc_hashtable[i].chain = NULL;
1112         }
1113
1114         /* Allocate and initialize the endpoint hash table.  */
1115         sctp_ep_hashsize = 64;
1116         sctp_ep_hashtable = (struct sctp_hashbucket *)
1117                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1118         if (!sctp_ep_hashtable) {
1119                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1120                 status = -ENOMEM;
1121                 goto err_ehash_alloc;
1122         }
1123         for (i = 0; i < sctp_ep_hashsize; i++) {
1124                 rwlock_init(&sctp_ep_hashtable[i].lock);
1125                 sctp_ep_hashtable[i].chain = NULL;
1126         }
1127
1128         /* Allocate and initialize the SCTP port hash table.  */
1129         do {
1130                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1131                                         sizeof(struct sctp_bind_hashbucket);
1132                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1133                         continue;
1134                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1135                                         __get_free_pages(GFP_ATOMIC, order);
1136         } while (!sctp_port_hashtable && --order > 0);
1137         if (!sctp_port_hashtable) {
1138                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1139                 status = -ENOMEM;
1140                 goto err_bhash_alloc;
1141         }
1142         for (i = 0; i < sctp_port_hashsize; i++) {
1143                 spin_lock_init(&sctp_port_hashtable[i].lock);
1144                 sctp_port_hashtable[i].chain = NULL;
1145         }
1146
1147         spin_lock_init(&sctp_port_alloc_lock);
1148         sctp_port_rover = sysctl_local_port_range[0] - 1;
1149
1150         printk(KERN_INFO "SCTP: Hash tables configured "
1151                          "(established %d bind %d)\n",
1152                 sctp_assoc_hashsize, sctp_port_hashsize);
1153
1154         /* Disable ADDIP by default. */
1155         sctp_addip_enable = 0;
1156
1157         /* Enable PR-SCTP by default. */
1158         sctp_prsctp_enable = 1;
1159
1160         sctp_sysctl_register();
1161
1162         INIT_LIST_HEAD(&sctp_address_families);
1163         sctp_register_af(&sctp_ipv4_specific);
1164
1165         status = proto_register(&sctp_prot, 1);
1166         if (status)
1167                 goto err_proto_register;
1168
1169         /* Register SCTP(UDP and TCP style) with socket layer.  */
1170         inet_register_protosw(&sctp_seqpacket_protosw);
1171         inet_register_protosw(&sctp_stream_protosw);
1172
1173         status = sctp_v6_init();
1174         if (status)
1175                 goto err_v6_init;
1176
1177         /* Initialize the control inode/socket for handling OOTB packets.  */
1178         if ((status = sctp_ctl_sock_init())) {
1179                 printk (KERN_ERR
1180                         "SCTP: Failed to initialize the SCTP control sock.\n");
1181                 goto err_ctl_sock_init;
1182         }
1183
1184         /* Initialize the local address list. */
1185         INIT_LIST_HEAD(&sctp_local_addr_list);
1186         spin_lock_init(&sctp_local_addr_lock);
1187         sctp_get_local_addr_list();
1188
1189         /* Register notifier for inet address additions/deletions. */
1190         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1191
1192         /* Register SCTP with inet layer.  */
1193         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) {
1194                 status = -EAGAIN;
1195                 goto err_add_protocol;
1196         }
1197
1198         /* Register SCTP with inet6 layer.  */
1199         status = sctp_v6_add_protocol();
1200         if (status)
1201                 goto err_v6_add_protocol;
1202
1203         __unsafe(THIS_MODULE);
1204         status = 0;
1205 out:
1206         return status;
1207 err_v6_add_protocol:
1208         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1209         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1210 err_add_protocol:
1211         sctp_free_local_addr_list();
1212         sock_release(sctp_ctl_socket);
1213 err_ctl_sock_init:
1214         sctp_v6_exit();
1215 err_v6_init:
1216         inet_unregister_protosw(&sctp_stream_protosw);
1217         inet_unregister_protosw(&sctp_seqpacket_protosw);
1218         proto_unregister(&sctp_prot);
1219 err_proto_register:
1220         sctp_sysctl_unregister();
1221         list_del(&sctp_ipv4_specific.list);
1222         free_pages((unsigned long)sctp_port_hashtable,
1223                    get_order(sctp_port_hashsize *
1224                              sizeof(struct sctp_bind_hashbucket)));
1225 err_bhash_alloc:
1226         kfree(sctp_ep_hashtable);
1227 err_ehash_alloc:
1228         free_pages((unsigned long)sctp_assoc_hashtable,
1229                    get_order(sctp_assoc_hashsize *
1230                              sizeof(struct sctp_hashbucket)));
1231 err_ahash_alloc:
1232         sctp_dbg_objcnt_exit();
1233         sctp_proc_exit();
1234 err_init_proc:
1235         cleanup_sctp_mibs();
1236 err_init_mibs:
1237         kmem_cache_destroy(sctp_chunk_cachep);
1238 err_chunk_cachep:
1239         kmem_cache_destroy(sctp_bucket_cachep);
1240         goto out;
1241 }
1242
1243 /* Exit handler for the SCTP protocol.  */
1244 SCTP_STATIC __exit void sctp_exit(void)
1245 {
1246         /* BUG.  This should probably do something useful like clean
1247          * up all the remaining associations and all that memory.
1248          */
1249
1250         /* Unregister with inet6/inet layers. */
1251         sctp_v6_del_protocol();
1252         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1253
1254         /* Unregister notifier for inet address additions/deletions. */
1255         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1256
1257         /* Free the local address list.  */
1258         sctp_free_local_addr_list();
1259
1260         /* Free the control endpoint.  */
1261         sock_release(sctp_ctl_socket);
1262
1263         /* Cleanup v6 initializations. */
1264         sctp_v6_exit();
1265
1266         /* Unregister with socket layer. */
1267         inet_unregister_protosw(&sctp_stream_protosw);
1268         inet_unregister_protosw(&sctp_seqpacket_protosw);
1269
1270         sctp_sysctl_unregister();
1271         list_del(&sctp_ipv4_specific.list);
1272
1273         free_pages((unsigned long)sctp_assoc_hashtable,
1274                    get_order(sctp_assoc_hashsize *
1275                              sizeof(struct sctp_hashbucket)));
1276         kfree(sctp_ep_hashtable);
1277         free_pages((unsigned long)sctp_port_hashtable,
1278                    get_order(sctp_port_hashsize *
1279                              sizeof(struct sctp_bind_hashbucket)));
1280
1281         sctp_dbg_objcnt_exit();
1282         sctp_proc_exit();
1283         cleanup_sctp_mibs();
1284
1285         kmem_cache_destroy(sctp_chunk_cachep);
1286         kmem_cache_destroy(sctp_bucket_cachep);
1287
1288         proto_unregister(&sctp_prot);
1289 }
1290
1291 module_init(sctp_init);
1292 module_exit(sctp_exit);
1293
1294 /*
1295  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1296  */
1297 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1298 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1299 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1300 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1301 MODULE_LICENSE("GPL");