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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090057#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020058#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <net/protocol.h>
60#include <net/ip.h>
61#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020062#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <net/sctp/sctp.h>
64#include <net/addrconf.h>
65#include <net/inet_common.h>
66#include <net/inet_ecn.h>
67
68/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070069struct sctp_globals sctp_globals __read_mostly;
Eric Dumazetba899662005-08-26 12:05:31 -070070DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Florian Westphalc4e85f82008-07-18 23:03:44 -070072#ifdef CONFIG_PROC_FS
73struct proc_dir_entry *proc_net_sctp;
74#endif
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076struct idr sctp_assocs_id;
77DEFINE_SPINLOCK(sctp_assocs_id_lock);
78
79/* This is the global socket data structure used for responding to
80 * the Out-of-the-blue (OOTB) packets. A control sock will be created
81 * for this socket at the initialization time.
82 */
Denis V. Lunev82581752008-04-03 14:27:26 -070083static struct sock *sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85static struct sctp_pf *sctp_pf_inet6_specific;
86static struct sctp_pf *sctp_pf_inet_specific;
87static struct sctp_af *sctp_af_v4_specific;
88static struct sctp_af *sctp_af_v6_specific;
89
Christoph Lametere18b8902006-12-06 20:33:20 -080090struct kmem_cache *sctp_chunk_cachep __read_mostly;
91struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Vlad Yasevich007e3932007-09-16 16:04:37 -070093int sysctl_sctp_mem[3];
94int sysctl_sctp_rmem[3];
95int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/* Return the address of the control sock. */
98struct sock *sctp_get_ctl_sock(void)
99{
Denis V. Lunev82581752008-04-03 14:27:26 -0700100 return sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
103/* Set up the proc fs entry for the SCTP protocol. */
104static __init int sctp_proc_init(void)
105{
Eric Dumazet17483762008-11-25 21:16:35 -0800106 if (percpu_counter_init(&sctp_sockets_allocated, 0))
107 goto out_nomem;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700108#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 if (!proc_net_sctp) {
Alexey Dobriyan99b76232009-03-25 22:48:06 +0300110 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
111 if (!proc_net_sctp)
Eric Dumazet17483762008-11-25 21:16:35 -0800112 goto out_free_percpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
114
115 if (sctp_snmp_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700116 goto out_snmp_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (sctp_eps_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700118 goto out_eps_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (sctp_assocs_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700120 goto out_assocs_proc_init;
Neil Horman20c2c1f2008-05-09 15:14:50 -0700121 if (sctp_remaddr_proc_init())
David S. Millercaea9022008-06-16 18:25:48 -0700122 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 return 0;
125
David S. Millercaea9022008-06-16 18:25:48 -0700126out_remaddr_proc_init:
Pavel Emelyanov3d00fb92008-06-17 15:54:14 -0700127 sctp_assocs_proc_exit();
Wei Yongjun80896a32008-06-16 16:59:55 -0700128out_assocs_proc_init:
129 sctp_eps_proc_exit();
130out_eps_proc_init:
131 sctp_snmp_proc_exit();
132out_snmp_proc_init:
133 if (proc_net_sctp) {
134 proc_net_sctp = NULL;
135 remove_proc_entry("sctp", init_net.proc_net);
136 }
Eric Dumazet17483762008-11-25 21:16:35 -0800137out_free_percpu:
138 percpu_counter_destroy(&sctp_sockets_allocated);
Florian Westphalc4e85f82008-07-18 23:03:44 -0700139#else
140 return 0;
141#endif /* CONFIG_PROC_FS */
Randy Dunlap157653c2008-11-27 15:30:53 -0800142
143out_nomem:
144 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900147/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 * Note: Do not make this __exit as it is used in the init error
149 * path.
150 */
151static void sctp_proc_exit(void)
152{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700153#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 sctp_snmp_proc_exit();
155 sctp_eps_proc_exit();
156 sctp_assocs_proc_exit();
Neil Horman20c2c1f2008-05-09 15:14:50 -0700157 sctp_remaddr_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 if (proc_net_sctp) {
160 proc_net_sctp = NULL;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200161 remove_proc_entry("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
Florian Westphalc4e85f82008-07-18 23:03:44 -0700163#endif
Rafael Laufer418372b2009-08-07 05:17:17 +0000164 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
167/* Private helper to extract ipv4 address and stash them in
168 * the protocol structure.
169 */
170static void sctp_v4_copy_addrlist(struct list_head *addrlist,
171 struct net_device *dev)
172{
173 struct in_device *in_dev;
174 struct in_ifaddr *ifa;
175 struct sctp_sockaddr_entry *addr;
176
177 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700178 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 rcu_read_unlock();
180 return;
181 }
182
183 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
184 /* Add the address to the local list. */
185 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
186 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800187 addr->a.v4.sin_family = AF_INET;
188 addr->a.v4.sin_port = 0;
189 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700190 addr->valid = 1;
191 INIT_LIST_HEAD(&addr->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 list_add_tail(&addr->list, addrlist);
193 }
194 }
195
196 rcu_read_unlock();
197}
198
199/* Extract our IP addresses from the system and stash them in the
200 * protocol structure.
201 */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800202static void sctp_get_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
204 struct net_device *dev;
205 struct list_head *pos;
206 struct sctp_af *af;
207
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800208 rcu_read_lock();
209 for_each_netdev_rcu(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 __list_for_each(pos, &sctp_address_families) {
211 af = list_entry(pos, struct sctp_af, list);
212 af->copy_addrlist(&sctp_local_addr_list, dev);
213 }
214 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800215 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/* Free the existing local addresses. */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800219static void sctp_free_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 struct sctp_sockaddr_entry *addr;
222 struct list_head *pos, *temp;
223
224 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
225 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
226 list_del(pos);
227 kfree(addr);
228 }
229}
230
Vlad Yasevich29303542007-09-16 16:02:12 -0700231void sctp_local_addr_free(struct rcu_head *head)
232{
233 struct sctp_sockaddr_entry *e = container_of(head,
234 struct sctp_sockaddr_entry, rcu);
235 kfree(e);
236}
237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238/* Copy the local addresses which are valid for 'scope' into 'bp'. */
239int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
Al Virodd0fc662005-10-07 07:46:04 +0100240 gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
242 struct sctp_sockaddr_entry *addr;
243 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Vlad Yasevich29303542007-09-16 16:02:12 -0700245 rcu_read_lock();
246 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
247 if (!addr->valid)
248 continue;
Al Viro6244be42006-11-20 17:21:44 -0800249 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 /* Now that the address is in scope, check to see if
251 * the address type is really supported by the local
252 * sock as well as the remote peer.
253 */
Al Viro6244be42006-11-20 17:21:44 -0800254 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800256 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 (copy_flags & SCTP_ADDR6_ALLOWED) &&
258 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800259 error = sctp_add_bind_addr(bp, &addr->a,
260 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (error)
262 goto end_copy;
263 }
264 }
265 }
266
267end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700268 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return error;
270}
271
272/* Initialize a sctp_addr from in incoming skb. */
273static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
274 int is_saddr)
275{
276 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800277 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 struct sctphdr *sh;
279
280 port = &addr->v4.sin_port;
281 addr->v4.sin_family = AF_INET;
282
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300283 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800285 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700286 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800288 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700289 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
291 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
292}
293
294/* Initialize an sctp_addr from a socket. */
295static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
296{
297 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800298 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000299 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302/* Initialize sk->sk_rcv_saddr from sctp_addr. */
303static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
304{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000305 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
308/* Initialize sk->sk_daddr from sctp_addr. */
309static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
310{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000311 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
314/* Initialize a sctp_addr from an address parameter. */
315static void sctp_v4_from_addr_param(union sctp_addr *addr,
316 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800317 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 addr->v4.sin_family = AF_INET;
320 addr->v4.sin_port = port;
321 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
322}
323
324/* Initialize an address parameter from a sctp_addr and return the length
325 * of the address parameter.
326 */
327static int sctp_v4_to_addr_param(const union sctp_addr *addr,
328 union sctp_addr_param *param)
329{
330 int length = sizeof(sctp_ipv4addr_param_t);
331
332 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800333 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900334 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 return length;
337}
338
339/* Initialize a sctp_addr from a dst_entry. */
340static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800341 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
343 struct rtable *rt = (struct rtable *)dst;
344 saddr->v4.sin_family = AF_INET;
345 saddr->v4.sin_port = port;
346 saddr->v4.sin_addr.s_addr = rt->rt_src;
347}
348
349/* Compare two addresses exactly. */
350static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
351 const union sctp_addr *addr2)
352{
353 if (addr1->sa.sa_family != addr2->sa.sa_family)
354 return 0;
355 if (addr1->v4.sin_port != addr2->v4.sin_port)
356 return 0;
357 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
358 return 0;
359
360 return 1;
361}
362
363/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800364static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700367 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 addr->v4.sin_port = port;
369}
370
371/* Is this a wildcard address? */
372static int sctp_v4_is_any(const union sctp_addr *addr)
373{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700374 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
377/* This function checks if the address is a valid address to be used for
378 * SCTP binding.
379 *
380 * Output:
381 * Return 0 - If the address is a non-unicast or an illegal address.
382 * Return 1 - If the address is a unicast.
383 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700384static int sctp_v4_addr_valid(union sctp_addr *addr,
385 struct sctp_sock *sp,
386 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700388 /* IPv4 addresses not allowed */
389 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
390 return 0;
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800393 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return 0;
395
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900396 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000397 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900398 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return 1;
401}
402
403/* Should this be available for binding? */
404static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
405{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800406 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Al Viroe6f1ceb2008-03-17 22:44:53 -0700409 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700410 ret != RTN_LOCAL &&
411 !sp->inet.freebind &&
412 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700414
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700415 if (ipv6_only_sock(sctp_opt2sk(sp)))
416 return 0;
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 return 1;
419}
420
421/* Checking the loopback, private and other address scopes as defined in
422 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
423 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
424 *
425 * Level 0 - unusable SCTP addresses
426 * Level 1 - loopback address
427 * Level 2 - link-local addresses
428 * Level 3 - private addresses.
429 * Level 4 - global addresses
430 * For INIT and INIT-ACK address list, let L be the level of
431 * of requested destination address, sender and receiver
432 * SHOULD include all of its addresses with level greater
433 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530434 *
435 * IPv4 scoping can be controlled through sysctl option
436 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 */
438static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
439{
440 sctp_scope_t retval;
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800443 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800445 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800447 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800449 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
450 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
451 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 retval = SCTP_SCOPE_PRIVATE;
453 } else {
454 retval = SCTP_SCOPE_GLOBAL;
455 }
456
457 return retval;
458}
459
460/* Returns a valid dst cache entry for the given source and destination ip
461 * addresses. If an association is passed, trys to get a dst entry with a
462 * source address that matches an address in the bind address list.
463 */
464static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
465 union sctp_addr *daddr,
466 union sctp_addr *saddr)
467{
468 struct rtable *rt;
469 struct flowi fl;
470 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 struct dst_entry *dst = NULL;
473 union sctp_addr dst_saddr;
474
475 memset(&fl, 0x0, sizeof(struct flowi));
476 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400477 fl.fl_ip_dport = daddr->v4.sin_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 fl.proto = IPPROTO_SCTP;
479 if (asoc) {
480 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
481 fl.oif = asoc->base.sk->sk_bound_dev_if;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400482 fl.fl_ip_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400484 if (saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 fl.fl4_src = saddr->v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400486 fl.fl_ip_sport = saddr->v4.sin_port;
487 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Harvey Harrison21454aa2008-10-31 00:54:56 -0700489 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
490 __func__, &fl.fl4_dst, &fl.fl4_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Denis V. Lunevf2063512008-01-22 22:07:34 -0800492 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700493 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495
496 /* If there is no association or if a source address is passed, no
497 * more validation is required.
498 */
499 if (!asoc || saddr)
500 goto out;
501
502 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 if (dst) {
505 /* Walk through the bind address list and look for a bind
506 * address that matches the source address of the returned dst.
507 */
Gui Jianfeng159c6be2008-06-04 12:38:07 -0700508 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700509 rcu_read_lock();
510 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800511 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700512 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800513 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 goto out_unlock;
515 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700516 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 /* None of the bound addresses match the source address of the
519 * dst. So release it.
520 */
521 dst_release(dst);
522 dst = NULL;
523 }
524
525 /* Walk through the bind address list and try to get a dst that
526 * matches a bind address as the source address.
527 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700528 rcu_read_lock();
529 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
530 if (!laddr->valid)
531 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800532 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800533 (AF_INET == laddr->a.sa.sa_family)) {
534 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400535 fl.fl_ip_sport = laddr->a.v4.sin_port;
Denis V. Lunevf2063512008-01-22 22:07:34 -0800536 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700537 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 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 Dumazet511c3f92009-06-02 05:14:27 +0000579 return skb_rtable(skb)->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{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900592 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700593 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000594 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
596 if (!newsk)
597 goto out;
598
599 sock_init_data(NULL, newsk);
600
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000601 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 sock_reset_flag(newsk, SOCK_ZAPPED);
603
604 newinet = inet_sk(newsk);
605
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000606 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700608 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if (newsk->sk_prot->init(newsk)) {
611 sk_common_release(newsk);
612 newsk = NULL;
613 }
614
615out:
616 return newsk;
617}
618
619/* Map address, empty for v4 family */
620static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
621{
622 /* Empty */
623}
624
625/* Dump the v4 addr to the seq file. */
626static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
627{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700628 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700631static void sctp_v4_ecn_capable(struct sock *sk)
632{
633 INET_ECN_xmit(sk);
634}
635
Vlad Yasevich29303542007-09-16 16:02:12 -0700636/* Event handler for inet address addition/deletion events.
637 * The sctp_local_addr_list needs to be protocted by a spin lock since
638 * multiple notifiers (say IPv4 and IPv6) may be running at the same
639 * time and thus corrupt the list.
640 * The reader side is protected with RCU.
641 */
Adrian Bunk24123182006-12-20 16:08:22 -0800642static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
643 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800645 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700646 struct sctp_sockaddr_entry *addr = NULL;
647 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700648 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700650 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
Denis V. Lunev6133fb12008-02-28 20:46:17 -0800651 return NOTIFY_DONE;
652
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800653 switch (ev) {
654 case NETDEV_UP:
655 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
656 if (addr) {
657 addr->a.v4.sin_family = AF_INET;
658 addr->a.v4.sin_port = 0;
659 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700660 addr->valid = 1;
661 spin_lock_bh(&sctp_local_addr_lock);
662 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
663 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800664 }
665 break;
666 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700667 spin_lock_bh(&sctp_local_addr_lock);
668 list_for_each_entry_safe(addr, temp,
669 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700670 if (addr->a.sa.sa_family == AF_INET &&
671 addr->a.v4.sin_addr.s_addr ==
672 ifa->ifa_local) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700673 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700674 addr->valid = 0;
675 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800676 break;
677 }
678 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700679 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700680 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700681 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800682 break;
683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 return NOTIFY_DONE;
686}
687
688/*
689 * Initialize the control inode/socket with a control endpoint data
690 * structure. This endpoint is reserved exclusively for the OOTB processing.
691 */
692static int sctp_ctl_sock_init(void)
693{
694 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800695 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (sctp_get_pf_specific(PF_INET6))
698 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700700 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700701 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800702
703 /* If IPv6 socket could not be created, try the IPv4 socket */
704 if (err < 0 && family == PF_INET6)
705 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
706 SOCK_SEQPACKET, IPPROTO_SCTP,
707 &init_net);
708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 if (err < 0) {
710 printk(KERN_ERR
711 "SCTP: Failed to create the SCTP control socket.\n");
712 return err;
713 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 return 0;
715}
716
717/* Register address family specific functions. */
718int sctp_register_af(struct sctp_af *af)
719{
720 switch (af->sa_family) {
721 case AF_INET:
722 if (sctp_af_v4_specific)
723 return 0;
724 sctp_af_v4_specific = af;
725 break;
726 case AF_INET6:
727 if (sctp_af_v6_specific)
728 return 0;
729 sctp_af_v6_specific = af;
730 break;
731 default:
732 return 0;
733 }
734
735 INIT_LIST_HEAD(&af->list);
736 list_add_tail(&af->list, &sctp_address_families);
737 return 1;
738}
739
740/* Get the table of functions for manipulating a particular address
741 * family.
742 */
743struct sctp_af *sctp_get_af_specific(sa_family_t family)
744{
745 switch (family) {
746 case AF_INET:
747 return sctp_af_v4_specific;
748 case AF_INET6:
749 return sctp_af_v6_specific;
750 default:
751 return NULL;
752 }
753}
754
755/* Common code to initialize a AF_INET msg_name. */
756static void sctp_inet_msgname(char *msgname, int *addr_len)
757{
758 struct sockaddr_in *sin;
759
760 sin = (struct sockaddr_in *)msgname;
761 *addr_len = sizeof(struct sockaddr_in);
762 sin->sin_family = AF_INET;
763 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
764}
765
766/* Copy the primary address of the peer primary address as the msg_name. */
767static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
768 int *addr_len)
769{
770 struct sockaddr_in *sin, *sinfrom;
771
772 if (msgname) {
773 struct sctp_association *asoc;
774
775 asoc = event->asoc;
776 sctp_inet_msgname(msgname, addr_len);
777 sin = (struct sockaddr_in *)msgname;
778 sinfrom = &asoc->peer.primary_addr.v4;
779 sin->sin_port = htons(asoc->peer.port);
780 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
781 }
782}
783
784/* Initialize and copy out a msgname from an inbound skb. */
785static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
786{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300788 struct sctphdr *sh = sctp_hdr(skb);
789 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700793 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 }
795}
796
797/* Do we support this AF? */
798static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
799{
800 /* PF_INET only supports AF_INET addresses. */
801 return (AF_INET == family);
802}
803
804/* Address matching with wildcards allowed. */
805static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
806 const union sctp_addr *addr2,
807 struct sctp_sock *opt)
808{
809 /* PF_INET only supports AF_INET addresses. */
810 if (addr1->sa.sa_family != addr2->sa.sa_family)
811 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700812 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
813 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 return 1;
815 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
816 return 1;
817
818 return 0;
819}
820
821/* Verify that provided sockaddr looks bindable. Common verification has
822 * already been taken care of.
823 */
824static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
825{
826 return sctp_v4_available(addr, opt);
827}
828
829/* Verify that sockaddr looks sendable. Common verification has already
830 * been taken care of.
831 */
832static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
833{
834 return 1;
835}
836
837/* Fill in Supported Address Type information for INIT and INIT-ACK
838 * chunks. Returns number of addresses supported.
839 */
840static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800841 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842{
843 types[0] = SCTP_PARAM_IPV4_ADDRESS;
844 return 1;
845}
846
847/* Wrapper routine that calls the ip transmit routine. */
848static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700849 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Herbert Xuf8803742008-08-03 21:15:08 -0700851 struct inet_sock *inet = inet_sk(skb->sk);
852
Harvey Harrison21454aa2008-10-31 00:54:56 -0700853 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800854 __func__, skb, skb->len,
Eric Dumazet511c3f92009-06-02 05:14:27 +0000855 &skb_rtable(skb)->rt_src,
856 &skb_rtable(skb)->rt_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Herbert Xuf8803742008-08-03 21:15:08 -0700858 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
859 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
Shan Wei4e15ed42010-04-15 16:43:08 +0000862 return ip_queue_xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863}
864
Neil Horman15efbe72008-02-15 09:53:59 -0500865static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
867static struct sctp_pf sctp_pf_inet = {
868 .event_msgname = sctp_inet_event_msgname,
869 .skb_msgname = sctp_inet_skb_msgname,
870 .af_supported = sctp_inet_af_supported,
871 .cmp_addr = sctp_inet_cmp_addr,
872 .bind_verify = sctp_inet_bind_verify,
873 .send_verify = sctp_inet_send_verify,
874 .supported_addrs = sctp_inet_supported_addrs,
875 .create_accept_sk = sctp_v4_create_accept_sk,
876 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500877 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878};
879
880/* Notifier for inetaddr addition/deletion events. */
881static struct notifier_block sctp_inetaddr_notifier = {
882 .notifier_call = sctp_inetaddr_event,
883};
884
885/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800886static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800887 .family = PF_INET,
888 .owner = THIS_MODULE,
889 .release = inet_release, /* Needs to be wrapped... */
890 .bind = inet_bind,
891 .connect = inet_dgram_connect,
892 .socketpair = sock_no_socketpair,
893 .accept = inet_accept,
894 .getname = inet_getname, /* Semantics are different. */
895 .poll = sctp_poll,
896 .ioctl = inet_ioctl,
897 .listen = sctp_inet_listen,
898 .shutdown = inet_shutdown, /* Looks harmless. */
899 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
900 .getsockopt = sock_common_getsockopt,
901 .sendmsg = inet_sendmsg,
902 .recvmsg = sock_common_recvmsg,
903 .mmap = sock_no_mmap,
904 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800905#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800906 .compat_setsockopt = compat_sock_common_setsockopt,
907 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800908#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909};
910
911/* Registration with AF_INET family. */
912static struct inet_protosw sctp_seqpacket_protosw = {
913 .type = SOCK_SEQPACKET,
914 .protocol = IPPROTO_SCTP,
915 .prot = &sctp_prot,
916 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 .no_check = 0,
918 .flags = SCTP_PROTOSW_FLAG
919};
920static struct inet_protosw sctp_stream_protosw = {
921 .type = SOCK_STREAM,
922 .protocol = IPPROTO_SCTP,
923 .prot = &sctp_prot,
924 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 .no_check = 0,
926 .flags = SCTP_PROTOSW_FLAG
927};
928
929/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +0000930static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 .handler = sctp_rcv,
932 .err_handler = sctp_v4_err,
933 .no_policy = 1,
934};
935
936/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500937static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800938 .sa_family = AF_INET,
939 .sctp_xmit = sctp_v4_xmit,
940 .setsockopt = ip_setsockopt,
941 .getsockopt = ip_getsockopt,
942 .get_dst = sctp_v4_get_dst,
943 .get_saddr = sctp_v4_get_saddr,
944 .copy_addrlist = sctp_v4_copy_addrlist,
945 .from_skb = sctp_v4_from_skb,
946 .from_sk = sctp_v4_from_sk,
947 .to_sk_saddr = sctp_v4_to_sk_saddr,
948 .to_sk_daddr = sctp_v4_to_sk_daddr,
949 .from_addr_param = sctp_v4_from_addr_param,
950 .to_addr_param = sctp_v4_to_addr_param,
951 .dst_saddr = sctp_v4_dst_saddr,
952 .cmp_addr = sctp_v4_cmp_addr,
953 .addr_valid = sctp_v4_addr_valid,
954 .inaddr_any = sctp_v4_inaddr_any,
955 .is_any = sctp_v4_is_any,
956 .available = sctp_v4_available,
957 .scope = sctp_v4_scope,
958 .skb_iif = sctp_v4_skb_iif,
959 .is_ce = sctp_v4_is_ce,
960 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700961 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800962 .net_header_len = sizeof(struct iphdr),
963 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800964#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800965 .compat_setsockopt = compat_ip_setsockopt,
966 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800967#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968};
969
970struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
971
972 switch (family) {
973 case PF_INET:
974 return sctp_pf_inet_specific;
975 case PF_INET6:
976 return sctp_pf_inet6_specific;
977 default:
978 return NULL;
979 }
980}
981
982/* Register the PF specific function table. */
983int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
984{
985 switch (family) {
986 case PF_INET:
987 if (sctp_pf_inet_specific)
988 return 0;
989 sctp_pf_inet_specific = pf;
990 break;
991 case PF_INET6:
992 if (sctp_pf_inet6_specific)
993 return 0;
994 sctp_pf_inet6_specific = pf;
995 break;
996 default:
997 return 0;
998 }
999 return 1;
1000}
1001
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001002static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Tejun Heo7d720c32010-02-16 15:20:26 +00001004 return snmp_mib_init((void __percpu **)sctp_statistics,
1005 sizeof(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006}
1007
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001008static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
Tejun Heo7d720c32010-02-16 15:20:26 +00001010 snmp_mib_free((void __percpu **)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011}
1012
Vlad Yasevich270637a2008-03-20 15:17:14 -07001013static void sctp_v4_pf_init(void)
1014{
1015 /* Initialize the SCTP specific PF functions. */
1016 sctp_register_pf(&sctp_pf_inet, PF_INET);
1017 sctp_register_af(&sctp_af_inet);
1018}
1019
1020static void sctp_v4_pf_exit(void)
1021{
1022 list_del(&sctp_af_inet.list);
1023}
1024
1025static int sctp_v4_protosw_init(void)
1026{
1027 int rc;
1028
1029 rc = proto_register(&sctp_prot, 1);
1030 if (rc)
1031 return rc;
1032
1033 /* Register SCTP(UDP and TCP style) with socket layer. */
1034 inet_register_protosw(&sctp_seqpacket_protosw);
1035 inet_register_protosw(&sctp_stream_protosw);
1036
1037 return 0;
1038}
1039
1040static void sctp_v4_protosw_exit(void)
1041{
1042 inet_unregister_protosw(&sctp_stream_protosw);
1043 inet_unregister_protosw(&sctp_seqpacket_protosw);
1044 proto_unregister(&sctp_prot);
1045}
1046
1047static int sctp_v4_add_protocol(void)
1048{
1049 /* Register notifier for inet address additions/deletions. */
1050 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1051
1052 /* Register SCTP with inet layer. */
1053 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1054 return -EAGAIN;
1055
1056 return 0;
1057}
1058
1059static void sctp_v4_del_protocol(void)
1060{
1061 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1062 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1063}
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065/* Initialize the universe into something sensible. */
1066SCTP_STATIC __init int sctp_init(void)
1067{
1068 int i;
1069 int status = -EINVAL;
1070 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001071 unsigned long limit;
Vlad Yasevich845525a2008-07-18 23:08:21 -07001072 unsigned long nr_pages;
Neil Horman4d93df02007-08-15 16:07:44 -07001073 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 int order;
1075
1076 /* SCTP_DEBUG sanity check. */
1077 if (!sctp_sanity_check())
1078 goto out;
1079
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001080 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 status = -ENOBUFS;
1082 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1083 sizeof(struct sctp_bind_bucket),
1084 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001085 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001087 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1090 sizeof(struct sctp_chunk),
1091 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001092 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 if (!sctp_chunk_cachep)
1094 goto err_chunk_cachep;
1095
1096 /* Allocate and initialise sctp mibs. */
1097 status = init_sctp_mibs();
1098 if (status)
1099 goto err_init_mibs;
1100
1101 /* Initialize proc fs directory. */
1102 status = sctp_proc_init();
1103 if (status)
1104 goto err_init_proc;
1105
1106 /* Initialize object count debugging. */
1107 sctp_dbg_objcnt_init();
1108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 /*
1110 * 14. Suggested SCTP Protocol Parameter Values
1111 */
1112 /* The following protocol parameters are RECOMMENDED: */
1113 /* RTO.Initial - 3 seconds */
1114 sctp_rto_initial = SCTP_RTO_INITIAL;
1115 /* RTO.Min - 1 second */
1116 sctp_rto_min = SCTP_RTO_MIN;
1117 /* RTO.Max - 60 seconds */
1118 sctp_rto_max = SCTP_RTO_MAX;
1119 /* RTO.Alpha - 1/8 */
1120 sctp_rto_alpha = SCTP_RTO_ALPHA;
1121 /* RTO.Beta - 1/4 */
1122 sctp_rto_beta = SCTP_RTO_BETA;
1123
1124 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001125 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127 /* Whether Cookie Preservative is enabled(1) or not(0) */
1128 sctp_cookie_preserve_enable = 1;
1129
1130 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001131 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
1133 /* Association.Max.Retrans - 10 attempts
1134 * Path.Max.Retrans - 5 attempts (per destination address)
1135 * Max.Init.Retransmits - 8 attempts
1136 */
1137 sctp_max_retrans_association = 10;
1138 sctp_max_retrans_path = 5;
1139 sctp_max_retrans_init = 8;
1140
Neil Horman4eb701d2005-04-28 12:02:04 -07001141 /* Sendbuffer growth - do per-socket accounting */
1142 sctp_sndbuf_policy = 0;
1143
Neil Horman049b3ff2005-11-11 16:08:24 -08001144 /* Rcvbuffer growth - do per-socket accounting */
1145 sctp_rcvbuf_policy = 0;
1146
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001148 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1149
1150 /* delayed SACK timeout */
1151 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
1153 /* Implementation specific variables. */
1154
1155 /* Initialize default stream count setup information. */
1156 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1157 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1158
1159 /* Initialize handle used for association ids. */
1160 idr_init(&sctp_assocs_id);
1161
Neil Horman4d93df02007-08-15 16:07:44 -07001162 /* Set the pressure threshold to be a fraction of global memory that
1163 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1164 * memory, with a floor of 128 pages.
1165 * Note this initalizes the data in sctpv6_prot too
1166 * Unabashedly stolen from tcp_init
1167 */
Vlad Yasevich845525a2008-07-18 23:08:21 -07001168 nr_pages = totalram_pages - totalhigh_pages;
1169 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1170 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
Neil Horman4d93df02007-08-15 16:07:44 -07001171 limit = max(limit, 128UL);
1172 sysctl_sctp_mem[0] = limit / 4 * 3;
1173 sysctl_sctp_mem[1] = limit;
1174 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1175
1176 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1177 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1178 max_share = min(4UL*1024*1024, limit);
1179
Vlad Yasevich845525a2008-07-18 23:08:21 -07001180 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Neil Horman4d93df02007-08-15 16:07:44 -07001181 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1182 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1183
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001184 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001185 sysctl_sctp_wmem[1] = 16*1024;
1186 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 /* Size and allocate the association hash table.
1189 * The methodology is similar to that of the tcp hash tables.
1190 */
Jan Beulich44813742009-09-21 17:03:05 -07001191 if (totalram_pages >= (128 * 1024))
1192 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 else
Jan Beulich44813742009-09-21 17:03:05 -07001194 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 for (order = 0; (1UL << order) < goal; order++)
1197 ;
1198
1199 do {
1200 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1201 sizeof(struct sctp_hashbucket);
1202 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1203 continue;
1204 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1205 __get_free_pages(GFP_ATOMIC, order);
1206 } while (!sctp_assoc_hashtable && --order > 0);
1207 if (!sctp_assoc_hashtable) {
1208 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1209 status = -ENOMEM;
1210 goto err_ahash_alloc;
1211 }
1212 for (i = 0; i < sctp_assoc_hashsize; i++) {
1213 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001214 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 }
1216
1217 /* Allocate and initialize the endpoint hash table. */
1218 sctp_ep_hashsize = 64;
1219 sctp_ep_hashtable = (struct sctp_hashbucket *)
1220 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1221 if (!sctp_ep_hashtable) {
1222 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1223 status = -ENOMEM;
1224 goto err_ehash_alloc;
1225 }
1226 for (i = 0; i < sctp_ep_hashsize; i++) {
1227 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001228 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 }
1230
1231 /* Allocate and initialize the SCTP port hash table. */
1232 do {
1233 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1234 sizeof(struct sctp_bind_hashbucket);
1235 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1236 continue;
1237 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1238 __get_free_pages(GFP_ATOMIC, order);
1239 } while (!sctp_port_hashtable && --order > 0);
1240 if (!sctp_port_hashtable) {
1241 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1242 status = -ENOMEM;
1243 goto err_bhash_alloc;
1244 }
1245 for (i = 0; i < sctp_port_hashsize; i++) {
1246 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001247 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 }
1249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 printk(KERN_INFO "SCTP: Hash tables configured "
1251 "(established %d bind %d)\n",
1252 sctp_assoc_hashsize, sctp_port_hashsize);
1253
1254 /* Disable ADDIP by default. */
1255 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001256 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
1258 /* Enable PR-SCTP by default. */
1259 sctp_prsctp_enable = 1;
1260
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001261 /* Disable AUTH by default. */
1262 sctp_auth_enable = 0;
1263
Bhaskar Dutta72388432009-09-03 17:25:47 +05301264 /* Set SCOPE policy to enabled */
1265 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1266
Vlad Yasevich90f2f532009-11-23 15:53:57 -05001267 /* Set the default rwnd update threshold */
1268 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 sctp_sysctl_register();
1271
1272 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001273 sctp_v4_pf_init();
1274 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
Vlad Yasevich270637a2008-03-20 15:17:14 -07001276 /* Initialize the local address list. */
1277 INIT_LIST_HEAD(&sctp_local_addr_list);
1278 spin_lock_init(&sctp_local_addr_lock);
1279 sctp_get_local_addr_list();
1280
1281 status = sctp_v4_protosw_init();
1282
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001283 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001284 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001285
Vlad Yasevich270637a2008-03-20 15:17:14 -07001286 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001288 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
1290 /* Initialize the control inode/socket for handling OOTB packets. */
1291 if ((status = sctp_ctl_sock_init())) {
1292 printk (KERN_ERR
1293 "SCTP: Failed to initialize the SCTP control sock.\n");
1294 goto err_ctl_sock_init;
1295 }
1296
Vlad Yasevich270637a2008-03-20 15:17:14 -07001297 status = sctp_v4_add_protocol();
1298 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001299 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001300
1301 /* Register SCTP with inet6 layer. */
1302 status = sctp_v6_add_protocol();
1303 if (status)
1304 goto err_v6_add_protocol;
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 status = 0;
1307out:
1308 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001309err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001310 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001311err_add_protocol:
Denis V. Lunev56772422008-04-03 14:28:30 -07001312 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313err_ctl_sock_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001314 sctp_v6_protosw_exit();
1315err_v6_protosw_init:
1316 sctp_v4_protosw_exit();
1317err_protosw_init:
1318 sctp_free_local_addr_list();
1319 sctp_v4_pf_exit();
1320 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 free_pages((unsigned long)sctp_port_hashtable,
1323 get_order(sctp_port_hashsize *
1324 sizeof(struct sctp_bind_hashbucket)));
1325err_bhash_alloc:
1326 kfree(sctp_ep_hashtable);
1327err_ehash_alloc:
1328 free_pages((unsigned long)sctp_assoc_hashtable,
1329 get_order(sctp_assoc_hashsize *
1330 sizeof(struct sctp_hashbucket)));
1331err_ahash_alloc:
1332 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001334err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 cleanup_sctp_mibs();
1336err_init_mibs:
1337 kmem_cache_destroy(sctp_chunk_cachep);
1338err_chunk_cachep:
1339 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 goto out;
1341}
1342
1343/* Exit handler for the SCTP protocol. */
1344SCTP_STATIC __exit void sctp_exit(void)
1345{
1346 /* BUG. This should probably do something useful like clean
1347 * up all the remaining associations and all that memory.
1348 */
1349
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001350 /* Unregister with inet6/inet layers. */
1351 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001352 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 /* Free the control endpoint. */
Denis V. Lunev56772422008-04-03 14:28:30 -07001355 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Vlad Yasevich270637a2008-03-20 15:17:14 -07001357 /* Free protosw registrations */
1358 sctp_v6_protosw_exit();
1359 sctp_v4_protosw_exit();
1360
1361 /* Free the local address list. */
1362 sctp_free_local_addr_list();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001363
1364 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001365 sctp_v6_pf_exit();
1366 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001367
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
1370 free_pages((unsigned long)sctp_assoc_hashtable,
1371 get_order(sctp_assoc_hashsize *
1372 sizeof(struct sctp_hashbucket)));
1373 kfree(sctp_ep_hashtable);
1374 free_pages((unsigned long)sctp_port_hashtable,
1375 get_order(sctp_port_hashsize *
1376 sizeof(struct sctp_bind_hashbucket)));
1377
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 sctp_dbg_objcnt_exit();
1379 sctp_proc_exit();
1380 cleanup_sctp_mibs();
1381
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001382 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1383
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001384 kmem_cache_destroy(sctp_chunk_cachep);
1385 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386}
1387
1388module_init(sctp_init);
1389module_exit(sctp_exit);
1390
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001391/*
1392 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1393 */
1394MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001395MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1397MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
Lucas Nussbaum06e86802009-02-13 08:33:41 +00001398module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1399MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400MODULE_LICENSE("GPL");