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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * 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>
Neil Horman4d93df02007-08-15 16:07:44 -070054#include <linux/bootmem.h>
Vlad Yasevich845525a2008-07-18 23:08:21 -070055#include <linux/highmem.h>
56#include <linux/swap.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020057#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <net/protocol.h>
59#include <net/ip.h>
60#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020061#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <net/sctp/sctp.h>
63#include <net/addrconf.h>
64#include <net/inet_common.h>
65#include <net/inet_ecn.h>
66
67/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070068struct sctp_globals sctp_globals __read_mostly;
Eric Dumazetba899662005-08-26 12:05:31 -070069DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Florian Westphalc4e85f82008-07-18 23:03:44 -070071#ifdef CONFIG_PROC_FS
72struct proc_dir_entry *proc_net_sctp;
73#endif
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075struct idr sctp_assocs_id;
76DEFINE_SPINLOCK(sctp_assocs_id_lock);
77
78/* This is the global socket data structure used for responding to
79 * the Out-of-the-blue (OOTB) packets. A control sock will be created
80 * for this socket at the initialization time.
81 */
Denis V. Lunev82581752008-04-03 14:27:26 -070082static struct sock *sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84static struct sctp_pf *sctp_pf_inet6_specific;
85static struct sctp_pf *sctp_pf_inet_specific;
86static struct sctp_af *sctp_af_v4_specific;
87static struct sctp_af *sctp_af_v6_specific;
88
Christoph Lametere18b8902006-12-06 20:33:20 -080089struct kmem_cache *sctp_chunk_cachep __read_mostly;
90struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Vlad Yasevich007e3932007-09-16 16:04:37 -070092int sysctl_sctp_mem[3];
93int sysctl_sctp_rmem[3];
94int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* Return the address of the control sock. */
97struct sock *sctp_get_ctl_sock(void)
98{
Denis V. Lunev82581752008-04-03 14:27:26 -070099 return sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
102/* Set up the proc fs entry for the SCTP protocol. */
103static __init int sctp_proc_init(void)
104{
Eric Dumazet17483762008-11-25 21:16:35 -0800105 if (percpu_counter_init(&sctp_sockets_allocated, 0))
106 goto out_nomem;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700107#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 if (!proc_net_sctp) {
109 struct proc_dir_entry *ent;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200110 ent = proc_mkdir("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (ent) {
112 ent->owner = THIS_MODULE;
113 proc_net_sctp = ent;
114 } else
Eric Dumazet17483762008-11-25 21:16:35 -0800115 goto out_free_percpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117
118 if (sctp_snmp_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700119 goto out_snmp_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (sctp_eps_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700121 goto out_eps_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 if (sctp_assocs_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700123 goto out_assocs_proc_init;
Neil Horman20c2c1f2008-05-09 15:14:50 -0700124 if (sctp_remaddr_proc_init())
David S. Millercaea9022008-06-16 18:25:48 -0700125 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 return 0;
128
David S. Millercaea9022008-06-16 18:25:48 -0700129out_remaddr_proc_init:
Pavel Emelyanov3d00fb92008-06-17 15:54:14 -0700130 sctp_assocs_proc_exit();
Wei Yongjun80896a32008-06-16 16:59:55 -0700131out_assocs_proc_init:
132 sctp_eps_proc_exit();
133out_eps_proc_init:
134 sctp_snmp_proc_exit();
135out_snmp_proc_init:
136 if (proc_net_sctp) {
137 proc_net_sctp = NULL;
138 remove_proc_entry("sctp", init_net.proc_net);
139 }
Eric Dumazet17483762008-11-25 21:16:35 -0800140out_free_percpu:
141 percpu_counter_destroy(&sctp_sockets_allocated);
Florian Westphalc4e85f82008-07-18 23:03:44 -0700142#else
143 return 0;
144#endif /* CONFIG_PROC_FS */
Randy Dunlap157653c2008-11-27 15:30:53 -0800145
146out_nomem:
147 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900150/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 * Note: Do not make this __exit as it is used in the init error
152 * path.
153 */
154static void sctp_proc_exit(void)
155{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700156#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 sctp_snmp_proc_exit();
158 sctp_eps_proc_exit();
159 sctp_assocs_proc_exit();
Neil Horman20c2c1f2008-05-09 15:14:50 -0700160 sctp_remaddr_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 if (proc_net_sctp) {
163 proc_net_sctp = NULL;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200164 remove_proc_entry("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
Florian Westphalc4e85f82008-07-18 23:03:44 -0700166#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
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();
Herbert Xue5ed6392005-10-03 14:35:55 -0700180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 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) {
Al Viro2a6fd782006-11-20 17:04:42 -0800189 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;
Vlad Yasevich29303542007-09-16 16:02:12 -0700192 addr->valid = 1;
193 INIT_LIST_HEAD(&addr->list);
194 INIT_RCU_HEAD(&addr->rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 list_add_tail(&addr->list, addrlist);
196 }
197 }
198
199 rcu_read_unlock();
200}
201
202/* Extract our IP addresses from the system and stash them in the
203 * protocol structure.
204 */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800205static void sctp_get_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
207 struct net_device *dev;
208 struct list_head *pos;
209 struct sctp_af *af;
210
211 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700212 for_each_netdev(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 __list_for_each(pos, &sctp_address_families) {
214 af = list_entry(pos, struct sctp_af, list);
215 af->copy_addrlist(&sctp_local_addr_list, dev);
216 }
217 }
218 read_unlock(&dev_base_lock);
219}
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221/* Free the existing local addresses. */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800222static void sctp_free_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 struct sctp_sockaddr_entry *addr;
225 struct list_head *pos, *temp;
226
227 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
228 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
229 list_del(pos);
230 kfree(addr);
231 }
232}
233
Vlad Yasevich29303542007-09-16 16:02:12 -0700234void sctp_local_addr_free(struct rcu_head *head)
235{
236 struct sctp_sockaddr_entry *e = container_of(head,
237 struct sctp_sockaddr_entry, rcu);
238 kfree(e);
239}
240
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241/* Copy the local addresses which are valid for 'scope' into 'bp'. */
242int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
Al Virodd0fc662005-10-07 07:46:04 +0100243 gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
245 struct sctp_sockaddr_entry *addr;
246 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Vlad Yasevich29303542007-09-16 16:02:12 -0700248 rcu_read_lock();
249 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
250 if (!addr->valid)
251 continue;
Al Viro6244be42006-11-20 17:21:44 -0800252 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 /* Now that the address is in scope, check to see if
254 * the address type is really supported by the local
255 * sock as well as the remote peer.
256 */
Al Viro6244be42006-11-20 17:21:44 -0800257 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800259 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 (copy_flags & SCTP_ADDR6_ALLOWED) &&
261 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800262 error = sctp_add_bind_addr(bp, &addr->a,
263 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (error)
265 goto end_copy;
266 }
267 }
268 }
269
270end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700271 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return error;
273}
274
275/* Initialize a sctp_addr from in incoming skb. */
276static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
277 int is_saddr)
278{
279 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800280 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 struct sctphdr *sh;
282
283 port = &addr->v4.sin_port;
284 addr->v4.sin_family = AF_INET;
285
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300286 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800288 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700289 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800291 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700292 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
295}
296
297/* Initialize an sctp_addr from a socket. */
298static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
299{
300 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800301 addr->v4.sin_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
303}
304
305/* Initialize sk->sk_rcv_saddr from sctp_addr. */
306static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
307{
308 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
309}
310
311/* Initialize sk->sk_daddr from sctp_addr. */
312static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
313{
314 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
315}
316
317/* Initialize a sctp_addr from an address parameter. */
318static void sctp_v4_from_addr_param(union sctp_addr *addr,
319 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800320 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
322 addr->v4.sin_family = AF_INET;
323 addr->v4.sin_port = port;
324 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
325}
326
327/* Initialize an address parameter from a sctp_addr and return the length
328 * of the address parameter.
329 */
330static int sctp_v4_to_addr_param(const union sctp_addr *addr,
331 union sctp_addr_param *param)
332{
333 int length = sizeof(sctp_ipv4addr_param_t);
334
335 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800336 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900337 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 return length;
340}
341
342/* Initialize a sctp_addr from a dst_entry. */
343static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800344 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 struct rtable *rt = (struct rtable *)dst;
347 saddr->v4.sin_family = AF_INET;
348 saddr->v4.sin_port = port;
349 saddr->v4.sin_addr.s_addr = rt->rt_src;
350}
351
352/* Compare two addresses exactly. */
353static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
354 const union sctp_addr *addr2)
355{
356 if (addr1->sa.sa_family != addr2->sa.sa_family)
357 return 0;
358 if (addr1->v4.sin_port != addr2->v4.sin_port)
359 return 0;
360 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
361 return 0;
362
363 return 1;
364}
365
366/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800367static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700370 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 addr->v4.sin_port = port;
372}
373
374/* Is this a wildcard address? */
375static int sctp_v4_is_any(const union sctp_addr *addr)
376{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700377 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380/* This function checks if the address is a valid address to be used for
381 * SCTP binding.
382 *
383 * Output:
384 * Return 0 - If the address is a non-unicast or an illegal address.
385 * Return 1 - If the address is a unicast.
386 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700387static int sctp_v4_addr_valid(union sctp_addr *addr,
388 struct sctp_sock *sp,
389 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700391 /* IPv4 addresses not allowed */
392 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
393 return 0;
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800396 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return 0;
398
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900399 /* Is this a broadcast address? */
Eric Dumazetee6b9672008-03-05 18:30:47 -0800400 if (skb && skb->rtable->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900401 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 return 1;
404}
405
406/* Should this be available for binding? */
407static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
408{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800409 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Al Viroe6f1ceb2008-03-17 22:44:53 -0700412 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700413 ret != RTN_LOCAL &&
414 !sp->inet.freebind &&
415 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700417
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700418 if (ipv6_only_sock(sctp_opt2sk(sp)))
419 return 0;
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 return 1;
422}
423
424/* Checking the loopback, private and other address scopes as defined in
425 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
426 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
427 *
428 * Level 0 - unusable SCTP addresses
429 * Level 1 - loopback address
430 * Level 2 - link-local addresses
431 * Level 3 - private addresses.
432 * Level 4 - global addresses
433 * For INIT and INIT-ACK address list, let L be the level of
434 * of requested destination address, sender and receiver
435 * SHOULD include all of its addresses with level greater
436 * than or equal to L.
437 */
438static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
439{
440 sctp_scope_t retval;
441
442 /* Should IPv4 scoping be a sysctl configurable option
443 * so users can turn it off (default on) for certain
444 * unconventional networking environments?
445 */
446
447 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800448 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800450 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800452 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800454 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
455 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
456 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 retval = SCTP_SCOPE_PRIVATE;
458 } else {
459 retval = SCTP_SCOPE_GLOBAL;
460 }
461
462 return retval;
463}
464
465/* Returns a valid dst cache entry for the given source and destination ip
466 * addresses. If an association is passed, trys to get a dst entry with a
467 * source address that matches an address in the bind address list.
468 */
469static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
470 union sctp_addr *daddr,
471 union sctp_addr *saddr)
472{
473 struct rtable *rt;
474 struct flowi fl;
475 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 struct dst_entry *dst = NULL;
478 union sctp_addr dst_saddr;
479
480 memset(&fl, 0x0, sizeof(struct flowi));
481 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
482 fl.proto = IPPROTO_SCTP;
483 if (asoc) {
484 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
485 fl.oif = asoc->base.sk->sk_bound_dev_if;
486 }
487 if (saddr)
488 fl.fl4_src = saddr->v4.sin_addr.s_addr;
489
Harvey Harrison21454aa2008-10-31 00:54:56 -0700490 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
491 __func__, &fl.fl4_dst, &fl.fl4_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Denis V. Lunevf2063512008-01-22 22:07:34 -0800493 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 dst = &rt->u.dst;
495 }
496
497 /* If there is no association or if a source address is passed, no
498 * more validation is required.
499 */
500 if (!asoc || saddr)
501 goto out;
502
503 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 if (dst) {
506 /* Walk through the bind address list and look for a bind
507 * address that matches the source address of the returned dst.
508 */
Gui Jianfeng159c6be2008-06-04 12:38:07 -0700509 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700510 rcu_read_lock();
511 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800512 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700513 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800514 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto out_unlock;
516 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700517 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 /* None of the bound addresses match the source address of the
520 * dst. So release it.
521 */
522 dst_release(dst);
523 dst = NULL;
524 }
525
526 /* Walk through the bind address list and try to get a dst that
527 * matches a bind address as the source address.
528 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700529 rcu_read_lock();
530 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
531 if (!laddr->valid)
532 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800533 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800534 (AF_INET == laddr->a.sa.sa_family)) {
535 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
Denis V. Lunevf2063512008-01-22 22:07:34 -0800536 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 dst = &rt->u.dst;
538 goto out_unlock;
539 }
540 }
541 }
542
543out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700544 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545out:
546 if (dst)
Harvey Harrison21454aa2008-10-31 00:54:56 -0700547 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
548 &rt->rt_dst, &rt->rt_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 else
550 SCTP_DEBUG_PRINTK("NO ROUTE\n");
551
552 return dst;
553}
554
555/* For v4, the source address is cached in the route entry(dst). So no need
556 * to cache it separately and hence this is an empty routine.
557 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900558static void sctp_v4_get_saddr(struct sctp_sock *sk,
559 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 struct dst_entry *dst,
561 union sctp_addr *daddr,
562 union sctp_addr *saddr)
563{
564 struct rtable *rt = (struct rtable *)dst;
565
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800566 if (!asoc)
567 return;
568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (rt) {
570 saddr->v4.sin_family = AF_INET;
Al Virod3f7a542006-11-20 17:12:41 -0800571 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900572 saddr->v4.sin_addr.s_addr = rt->rt_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 }
574}
575
576/* What interface did this skb arrive on? */
577static int sctp_v4_skb_iif(const struct sk_buff *skb)
578{
Eric Dumazetee6b9672008-03-05 18:30:47 -0800579 return skb->rtable->rt_iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
582/* Was this packet marked by Explicit Congestion Notification? */
583static int sctp_v4_is_ce(const struct sk_buff *skb)
584{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700585 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
588/* Create and initialize a new sk for the socket returned by accept(). */
589static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
590 struct sctp_association *asoc)
591{
592 struct inet_sock *inet = inet_sk(sk);
593 struct inet_sock *newinet;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900594 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700595 sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
597 if (!newsk)
598 goto out;
599
600 sock_init_data(NULL, newsk);
601
602 newsk->sk_type = SOCK_STREAM;
603
604 newsk->sk_no_check = sk->sk_no_check;
605 newsk->sk_reuse = sk->sk_reuse;
606 newsk->sk_shutdown = sk->sk_shutdown;
607
608 newsk->sk_destruct = inet_sock_destruct;
609 newsk->sk_family = PF_INET;
610 newsk->sk_protocol = IPPROTO_SCTP;
611 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
612 sock_reset_flag(newsk, SOCK_ZAPPED);
613
614 newinet = inet_sk(newsk);
615
616 /* Initialize sk's sport, dport, rcv_saddr and daddr for
617 * getsockname() and getpeername()
618 */
619 newinet->sport = inet->sport;
620 newinet->saddr = inet->saddr;
621 newinet->rcv_saddr = inet->rcv_saddr;
622 newinet->dport = htons(asoc->peer.port);
623 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
624 newinet->pmtudisc = inet->pmtudisc;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900625 newinet->id = asoc->next_tsn ^ jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 newinet->uc_ttl = -1;
628 newinet->mc_loop = 1;
629 newinet->mc_ttl = 1;
630 newinet->mc_index = 0;
631 newinet->mc_list = NULL;
632
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700633 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 if (newsk->sk_prot->init(newsk)) {
636 sk_common_release(newsk);
637 newsk = NULL;
638 }
639
640out:
641 return newsk;
642}
643
644/* Map address, empty for v4 family */
645static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
646{
647 /* Empty */
648}
649
650/* Dump the v4 addr to the seq file. */
651static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
652{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700653 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700656static void sctp_v4_ecn_capable(struct sock *sk)
657{
658 INET_ECN_xmit(sk);
659}
660
Vlad Yasevich29303542007-09-16 16:02:12 -0700661/* Event handler for inet address addition/deletion events.
662 * The sctp_local_addr_list needs to be protocted by a spin lock since
663 * multiple notifiers (say IPv4 and IPv6) may be running at the same
664 * time and thus corrupt the list.
665 * The reader side is protected with RCU.
666 */
Adrian Bunk24123182006-12-20 16:08:22 -0800667static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
668 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800670 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700671 struct sctp_sockaddr_entry *addr = NULL;
672 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700673 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700675 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
Denis V. Lunev6133fb12008-02-28 20:46:17 -0800676 return NOTIFY_DONE;
677
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800678 switch (ev) {
679 case NETDEV_UP:
680 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
681 if (addr) {
682 addr->a.v4.sin_family = AF_INET;
683 addr->a.v4.sin_port = 0;
684 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700685 addr->valid = 1;
686 spin_lock_bh(&sctp_local_addr_lock);
687 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
688 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800689 }
690 break;
691 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700692 spin_lock_bh(&sctp_local_addr_lock);
693 list_for_each_entry_safe(addr, temp,
694 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700695 if (addr->a.sa.sa_family == AF_INET &&
696 addr->a.v4.sin_addr.s_addr ==
697 ifa->ifa_local) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700698 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700699 addr->valid = 0;
700 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800701 break;
702 }
703 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700704 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700705 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700706 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800707 break;
708 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 return NOTIFY_DONE;
711}
712
713/*
714 * Initialize the control inode/socket with a control endpoint data
715 * structure. This endpoint is reserved exclusively for the OOTB processing.
716 */
717static int sctp_ctl_sock_init(void)
718{
719 int err;
720 sa_family_t family;
721
722 if (sctp_get_pf_specific(PF_INET6))
723 family = PF_INET6;
724 else
725 family = PF_INET;
726
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700727 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700728 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 if (err < 0) {
730 printk(KERN_ERR
731 "SCTP: Failed to create the SCTP control socket.\n");
732 return err;
733 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 return 0;
735}
736
737/* Register address family specific functions. */
738int sctp_register_af(struct sctp_af *af)
739{
740 switch (af->sa_family) {
741 case AF_INET:
742 if (sctp_af_v4_specific)
743 return 0;
744 sctp_af_v4_specific = af;
745 break;
746 case AF_INET6:
747 if (sctp_af_v6_specific)
748 return 0;
749 sctp_af_v6_specific = af;
750 break;
751 default:
752 return 0;
753 }
754
755 INIT_LIST_HEAD(&af->list);
756 list_add_tail(&af->list, &sctp_address_families);
757 return 1;
758}
759
760/* Get the table of functions for manipulating a particular address
761 * family.
762 */
763struct sctp_af *sctp_get_af_specific(sa_family_t family)
764{
765 switch (family) {
766 case AF_INET:
767 return sctp_af_v4_specific;
768 case AF_INET6:
769 return sctp_af_v6_specific;
770 default:
771 return NULL;
772 }
773}
774
775/* Common code to initialize a AF_INET msg_name. */
776static void sctp_inet_msgname(char *msgname, int *addr_len)
777{
778 struct sockaddr_in *sin;
779
780 sin = (struct sockaddr_in *)msgname;
781 *addr_len = sizeof(struct sockaddr_in);
782 sin->sin_family = AF_INET;
783 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
784}
785
786/* Copy the primary address of the peer primary address as the msg_name. */
787static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
788 int *addr_len)
789{
790 struct sockaddr_in *sin, *sinfrom;
791
792 if (msgname) {
793 struct sctp_association *asoc;
794
795 asoc = event->asoc;
796 sctp_inet_msgname(msgname, addr_len);
797 sin = (struct sockaddr_in *)msgname;
798 sinfrom = &asoc->peer.primary_addr.v4;
799 sin->sin_port = htons(asoc->peer.port);
800 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
801 }
802}
803
804/* Initialize and copy out a msgname from an inbound skb. */
805static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
806{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300808 struct sctphdr *sh = sctp_hdr(skb);
809 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
810
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700813 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 }
815}
816
817/* Do we support this AF? */
818static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
819{
820 /* PF_INET only supports AF_INET addresses. */
821 return (AF_INET == family);
822}
823
824/* Address matching with wildcards allowed. */
825static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
826 const union sctp_addr *addr2,
827 struct sctp_sock *opt)
828{
829 /* PF_INET only supports AF_INET addresses. */
830 if (addr1->sa.sa_family != addr2->sa.sa_family)
831 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700832 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
833 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 return 1;
835 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
836 return 1;
837
838 return 0;
839}
840
841/* Verify that provided sockaddr looks bindable. Common verification has
842 * already been taken care of.
843 */
844static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
845{
846 return sctp_v4_available(addr, opt);
847}
848
849/* Verify that sockaddr looks sendable. Common verification has already
850 * been taken care of.
851 */
852static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
853{
854 return 1;
855}
856
857/* Fill in Supported Address Type information for INIT and INIT-ACK
858 * chunks. Returns number of addresses supported.
859 */
860static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800861 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
863 types[0] = SCTP_PARAM_IPV4_ADDRESS;
864 return 1;
865}
866
867/* Wrapper routine that calls the ip transmit routine. */
868static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700869 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870{
Herbert Xuf8803742008-08-03 21:15:08 -0700871 struct inet_sock *inet = inet_sk(skb->sk);
872
Harvey Harrison21454aa2008-10-31 00:54:56 -0700873 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800874 __func__, skb, skb->len,
Harvey Harrison21454aa2008-10-31 00:54:56 -0700875 &skb->rtable->rt_src,
876 &skb->rtable->rt_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Herbert Xuf8803742008-08-03 21:15:08 -0700878 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
879 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
Herbert Xuf8803742008-08-03 21:15:08 -0700882 return ip_queue_xmit(skb, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883}
884
Neil Horman15efbe72008-02-15 09:53:59 -0500885static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887static struct sctp_pf sctp_pf_inet = {
888 .event_msgname = sctp_inet_event_msgname,
889 .skb_msgname = sctp_inet_skb_msgname,
890 .af_supported = sctp_inet_af_supported,
891 .cmp_addr = sctp_inet_cmp_addr,
892 .bind_verify = sctp_inet_bind_verify,
893 .send_verify = sctp_inet_send_verify,
894 .supported_addrs = sctp_inet_supported_addrs,
895 .create_accept_sk = sctp_v4_create_accept_sk,
896 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500897 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898};
899
900/* Notifier for inetaddr addition/deletion events. */
901static struct notifier_block sctp_inetaddr_notifier = {
902 .notifier_call = sctp_inetaddr_event,
903};
904
905/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800906static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800907 .family = PF_INET,
908 .owner = THIS_MODULE,
909 .release = inet_release, /* Needs to be wrapped... */
910 .bind = inet_bind,
911 .connect = inet_dgram_connect,
912 .socketpair = sock_no_socketpair,
913 .accept = inet_accept,
914 .getname = inet_getname, /* Semantics are different. */
915 .poll = sctp_poll,
916 .ioctl = inet_ioctl,
917 .listen = sctp_inet_listen,
918 .shutdown = inet_shutdown, /* Looks harmless. */
919 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
920 .getsockopt = sock_common_getsockopt,
921 .sendmsg = inet_sendmsg,
922 .recvmsg = sock_common_recvmsg,
923 .mmap = sock_no_mmap,
924 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800925#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800926 .compat_setsockopt = compat_sock_common_setsockopt,
927 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800928#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929};
930
931/* Registration with AF_INET family. */
932static struct inet_protosw sctp_seqpacket_protosw = {
933 .type = SOCK_SEQPACKET,
934 .protocol = IPPROTO_SCTP,
935 .prot = &sctp_prot,
936 .ops = &inet_seqpacket_ops,
937 .capability = -1,
938 .no_check = 0,
939 .flags = SCTP_PROTOSW_FLAG
940};
941static struct inet_protosw sctp_stream_protosw = {
942 .type = SOCK_STREAM,
943 .protocol = IPPROTO_SCTP,
944 .prot = &sctp_prot,
945 .ops = &inet_seqpacket_ops,
946 .capability = -1,
947 .no_check = 0,
948 .flags = SCTP_PROTOSW_FLAG
949};
950
951/* Register with IP layer. */
952static struct net_protocol sctp_protocol = {
953 .handler = sctp_rcv,
954 .err_handler = sctp_v4_err,
955 .no_policy = 1,
956};
957
958/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500959static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800960 .sa_family = AF_INET,
961 .sctp_xmit = sctp_v4_xmit,
962 .setsockopt = ip_setsockopt,
963 .getsockopt = ip_getsockopt,
964 .get_dst = sctp_v4_get_dst,
965 .get_saddr = sctp_v4_get_saddr,
966 .copy_addrlist = sctp_v4_copy_addrlist,
967 .from_skb = sctp_v4_from_skb,
968 .from_sk = sctp_v4_from_sk,
969 .to_sk_saddr = sctp_v4_to_sk_saddr,
970 .to_sk_daddr = sctp_v4_to_sk_daddr,
971 .from_addr_param = sctp_v4_from_addr_param,
972 .to_addr_param = sctp_v4_to_addr_param,
973 .dst_saddr = sctp_v4_dst_saddr,
974 .cmp_addr = sctp_v4_cmp_addr,
975 .addr_valid = sctp_v4_addr_valid,
976 .inaddr_any = sctp_v4_inaddr_any,
977 .is_any = sctp_v4_is_any,
978 .available = sctp_v4_available,
979 .scope = sctp_v4_scope,
980 .skb_iif = sctp_v4_skb_iif,
981 .is_ce = sctp_v4_is_ce,
982 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700983 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800984 .net_header_len = sizeof(struct iphdr),
985 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800986#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800987 .compat_setsockopt = compat_ip_setsockopt,
988 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800989#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990};
991
992struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
993
994 switch (family) {
995 case PF_INET:
996 return sctp_pf_inet_specific;
997 case PF_INET6:
998 return sctp_pf_inet6_specific;
999 default:
1000 return NULL;
1001 }
1002}
1003
1004/* Register the PF specific function table. */
1005int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1006{
1007 switch (family) {
1008 case PF_INET:
1009 if (sctp_pf_inet_specific)
1010 return 0;
1011 sctp_pf_inet_specific = pf;
1012 break;
1013 case PF_INET6:
1014 if (sctp_pf_inet6_specific)
1015 return 0;
1016 sctp_pf_inet6_specific = pf;
1017 break;
1018 default:
1019 return 0;
1020 }
1021 return 1;
1022}
1023
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001024static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025{
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001026 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027}
1028
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001029static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030{
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001031 snmp_mib_free((void**)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032}
1033
Vlad Yasevich270637a2008-03-20 15:17:14 -07001034static void sctp_v4_pf_init(void)
1035{
1036 /* Initialize the SCTP specific PF functions. */
1037 sctp_register_pf(&sctp_pf_inet, PF_INET);
1038 sctp_register_af(&sctp_af_inet);
1039}
1040
1041static void sctp_v4_pf_exit(void)
1042{
1043 list_del(&sctp_af_inet.list);
1044}
1045
1046static int sctp_v4_protosw_init(void)
1047{
1048 int rc;
1049
1050 rc = proto_register(&sctp_prot, 1);
1051 if (rc)
1052 return rc;
1053
1054 /* Register SCTP(UDP and TCP style) with socket layer. */
1055 inet_register_protosw(&sctp_seqpacket_protosw);
1056 inet_register_protosw(&sctp_stream_protosw);
1057
1058 return 0;
1059}
1060
1061static void sctp_v4_protosw_exit(void)
1062{
1063 inet_unregister_protosw(&sctp_stream_protosw);
1064 inet_unregister_protosw(&sctp_seqpacket_protosw);
1065 proto_unregister(&sctp_prot);
1066}
1067
1068static int sctp_v4_add_protocol(void)
1069{
1070 /* Register notifier for inet address additions/deletions. */
1071 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1072
1073 /* Register SCTP with inet layer. */
1074 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1075 return -EAGAIN;
1076
1077 return 0;
1078}
1079
1080static void sctp_v4_del_protocol(void)
1081{
1082 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1083 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1084}
1085
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086/* Initialize the universe into something sensible. */
1087SCTP_STATIC __init int sctp_init(void)
1088{
1089 int i;
1090 int status = -EINVAL;
1091 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001092 unsigned long limit;
Vlad Yasevich845525a2008-07-18 23:08:21 -07001093 unsigned long nr_pages;
Neil Horman4d93df02007-08-15 16:07:44 -07001094 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 int order;
1096
1097 /* SCTP_DEBUG sanity check. */
1098 if (!sctp_sanity_check())
1099 goto out;
1100
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001101 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 status = -ENOBUFS;
1103 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1104 sizeof(struct sctp_bind_bucket),
1105 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001106 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001108 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
1110 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1111 sizeof(struct sctp_chunk),
1112 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001113 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 if (!sctp_chunk_cachep)
1115 goto err_chunk_cachep;
1116
1117 /* Allocate and initialise sctp mibs. */
1118 status = init_sctp_mibs();
1119 if (status)
1120 goto err_init_mibs;
1121
1122 /* Initialize proc fs directory. */
1123 status = sctp_proc_init();
1124 if (status)
1125 goto err_init_proc;
1126
1127 /* Initialize object count debugging. */
1128 sctp_dbg_objcnt_init();
1129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 /*
1131 * 14. Suggested SCTP Protocol Parameter Values
1132 */
1133 /* The following protocol parameters are RECOMMENDED: */
1134 /* RTO.Initial - 3 seconds */
1135 sctp_rto_initial = SCTP_RTO_INITIAL;
1136 /* RTO.Min - 1 second */
1137 sctp_rto_min = SCTP_RTO_MIN;
1138 /* RTO.Max - 60 seconds */
1139 sctp_rto_max = SCTP_RTO_MAX;
1140 /* RTO.Alpha - 1/8 */
1141 sctp_rto_alpha = SCTP_RTO_ALPHA;
1142 /* RTO.Beta - 1/4 */
1143 sctp_rto_beta = SCTP_RTO_BETA;
1144
1145 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001146 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
1148 /* Whether Cookie Preservative is enabled(1) or not(0) */
1149 sctp_cookie_preserve_enable = 1;
1150
1151 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001152 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154 /* Association.Max.Retrans - 10 attempts
1155 * Path.Max.Retrans - 5 attempts (per destination address)
1156 * Max.Init.Retransmits - 8 attempts
1157 */
1158 sctp_max_retrans_association = 10;
1159 sctp_max_retrans_path = 5;
1160 sctp_max_retrans_init = 8;
1161
Neil Horman4eb701d2005-04-28 12:02:04 -07001162 /* Sendbuffer growth - do per-socket accounting */
1163 sctp_sndbuf_policy = 0;
1164
Neil Horman049b3ff2005-11-11 16:08:24 -08001165 /* Rcvbuffer growth - do per-socket accounting */
1166 sctp_rcvbuf_policy = 0;
1167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001169 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1170
1171 /* delayed SACK timeout */
1172 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
1174 /* Implementation specific variables. */
1175
1176 /* Initialize default stream count setup information. */
1177 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1178 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1179
1180 /* Initialize handle used for association ids. */
1181 idr_init(&sctp_assocs_id);
1182
Neil Horman4d93df02007-08-15 16:07:44 -07001183 /* Set the pressure threshold to be a fraction of global memory that
1184 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1185 * memory, with a floor of 128 pages.
1186 * Note this initalizes the data in sctpv6_prot too
1187 * Unabashedly stolen from tcp_init
1188 */
Vlad Yasevich845525a2008-07-18 23:08:21 -07001189 nr_pages = totalram_pages - totalhigh_pages;
1190 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1191 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
Neil Horman4d93df02007-08-15 16:07:44 -07001192 limit = max(limit, 128UL);
1193 sysctl_sctp_mem[0] = limit / 4 * 3;
1194 sysctl_sctp_mem[1] = limit;
1195 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1196
1197 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1198 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1199 max_share = min(4UL*1024*1024, limit);
1200
Vlad Yasevich845525a2008-07-18 23:08:21 -07001201 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Neil Horman4d93df02007-08-15 16:07:44 -07001202 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1203 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1204
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001205 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001206 sysctl_sctp_wmem[1] = 16*1024;
1207 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 /* Size and allocate the association hash table.
1210 * The methodology is similar to that of the tcp hash tables.
1211 */
1212 if (num_physpages >= (128 * 1024))
1213 goal = num_physpages >> (22 - PAGE_SHIFT);
1214 else
1215 goal = num_physpages >> (24 - PAGE_SHIFT);
1216
1217 for (order = 0; (1UL << order) < goal; order++)
1218 ;
1219
1220 do {
1221 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1222 sizeof(struct sctp_hashbucket);
1223 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1224 continue;
1225 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1226 __get_free_pages(GFP_ATOMIC, order);
1227 } while (!sctp_assoc_hashtable && --order > 0);
1228 if (!sctp_assoc_hashtable) {
1229 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1230 status = -ENOMEM;
1231 goto err_ahash_alloc;
1232 }
1233 for (i = 0; i < sctp_assoc_hashsize; i++) {
1234 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001235 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 }
1237
1238 /* Allocate and initialize the endpoint hash table. */
1239 sctp_ep_hashsize = 64;
1240 sctp_ep_hashtable = (struct sctp_hashbucket *)
1241 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1242 if (!sctp_ep_hashtable) {
1243 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1244 status = -ENOMEM;
1245 goto err_ehash_alloc;
1246 }
1247 for (i = 0; i < sctp_ep_hashsize; i++) {
1248 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001249 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251
1252 /* Allocate and initialize the SCTP port hash table. */
1253 do {
1254 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1255 sizeof(struct sctp_bind_hashbucket);
1256 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1257 continue;
1258 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1259 __get_free_pages(GFP_ATOMIC, order);
1260 } while (!sctp_port_hashtable && --order > 0);
1261 if (!sctp_port_hashtable) {
1262 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1263 status = -ENOMEM;
1264 goto err_bhash_alloc;
1265 }
1266 for (i = 0; i < sctp_port_hashsize; i++) {
1267 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001268 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 }
1270
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 printk(KERN_INFO "SCTP: Hash tables configured "
1272 "(established %d bind %d)\n",
1273 sctp_assoc_hashsize, sctp_port_hashsize);
1274
1275 /* Disable ADDIP by default. */
1276 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001277 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
1279 /* Enable PR-SCTP by default. */
1280 sctp_prsctp_enable = 1;
1281
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001282 /* Disable AUTH by default. */
1283 sctp_auth_enable = 0;
1284
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 sctp_sysctl_register();
1286
1287 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001288 sctp_v4_pf_init();
1289 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Vlad Yasevich270637a2008-03-20 15:17:14 -07001291 /* Initialize the local address list. */
1292 INIT_LIST_HEAD(&sctp_local_addr_list);
1293 spin_lock_init(&sctp_local_addr_lock);
1294 sctp_get_local_addr_list();
1295
1296 status = sctp_v4_protosw_init();
1297
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001298 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001299 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001300
Vlad Yasevich270637a2008-03-20 15:17:14 -07001301 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001303 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
1305 /* Initialize the control inode/socket for handling OOTB packets. */
1306 if ((status = sctp_ctl_sock_init())) {
1307 printk (KERN_ERR
1308 "SCTP: Failed to initialize the SCTP control sock.\n");
1309 goto err_ctl_sock_init;
1310 }
1311
Vlad Yasevich270637a2008-03-20 15:17:14 -07001312 status = sctp_v4_add_protocol();
1313 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001314 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001315
1316 /* Register SCTP with inet6 layer. */
1317 status = sctp_v6_add_protocol();
1318 if (status)
1319 goto err_v6_add_protocol;
1320
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 status = 0;
1322out:
1323 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001324err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001325 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001326err_add_protocol:
Denis V. Lunev56772422008-04-03 14:28:30 -07001327 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328err_ctl_sock_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001329 sctp_v6_protosw_exit();
1330err_v6_protosw_init:
1331 sctp_v4_protosw_exit();
1332err_protosw_init:
1333 sctp_free_local_addr_list();
1334 sctp_v4_pf_exit();
1335 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 free_pages((unsigned long)sctp_port_hashtable,
1338 get_order(sctp_port_hashsize *
1339 sizeof(struct sctp_bind_hashbucket)));
1340err_bhash_alloc:
1341 kfree(sctp_ep_hashtable);
1342err_ehash_alloc:
1343 free_pages((unsigned long)sctp_assoc_hashtable,
1344 get_order(sctp_assoc_hashsize *
1345 sizeof(struct sctp_hashbucket)));
1346err_ahash_alloc:
1347 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001349err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 cleanup_sctp_mibs();
1351err_init_mibs:
1352 kmem_cache_destroy(sctp_chunk_cachep);
1353err_chunk_cachep:
1354 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 goto out;
1356}
1357
1358/* Exit handler for the SCTP protocol. */
1359SCTP_STATIC __exit void sctp_exit(void)
1360{
1361 /* BUG. This should probably do something useful like clean
1362 * up all the remaining associations and all that memory.
1363 */
1364
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001365 /* Unregister with inet6/inet layers. */
1366 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001367 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /* Free the control endpoint. */
Denis V. Lunev56772422008-04-03 14:28:30 -07001370 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
Vlad Yasevich270637a2008-03-20 15:17:14 -07001372 /* Free protosw registrations */
1373 sctp_v6_protosw_exit();
1374 sctp_v4_protosw_exit();
1375
1376 /* Free the local address list. */
1377 sctp_free_local_addr_list();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001378
1379 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001380 sctp_v6_pf_exit();
1381 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001382
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 free_pages((unsigned long)sctp_assoc_hashtable,
1386 get_order(sctp_assoc_hashsize *
1387 sizeof(struct sctp_hashbucket)));
1388 kfree(sctp_ep_hashtable);
1389 free_pages((unsigned long)sctp_port_hashtable,
1390 get_order(sctp_port_hashsize *
1391 sizeof(struct sctp_bind_hashbucket)));
1392
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 sctp_dbg_objcnt_exit();
1394 sctp_proc_exit();
1395 cleanup_sctp_mibs();
1396
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001397 kmem_cache_destroy(sctp_chunk_cachep);
1398 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399}
1400
1401module_init(sctp_init);
1402module_exit(sctp_exit);
1403
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001404/*
1405 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1406 */
1407MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001408MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1410MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1411MODULE_LICENSE("GPL");