blob: e58f9476f29c571cb516acd53516bdc46707a416 [file] [log] [blame]
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
Joe Perches145ce502010-08-24 13:21:08 +000049#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
Neil Horman4d93df02007-08-15 16:07:44 -070056#include <linux/bootmem.h>
Vlad Yasevich845525a2008-07-18 23:08:21 -070057#include <linux/highmem.h>
58#include <linux/swap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020060#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020064#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070071struct sctp_globals sctp_globals __read_mostly;
Eric Dumazetba899662005-08-26 12:05:31 -070072DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Florian Westphalc4e85f82008-07-18 23:03:44 -070074#ifdef CONFIG_PROC_FS
75struct proc_dir_entry *proc_net_sctp;
76#endif
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078struct idr sctp_assocs_id;
79DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81/* This is the global socket data structure used for responding to
82 * the Out-of-the-blue (OOTB) packets. A control sock will be created
83 * for this socket at the initialization time.
84 */
Denis V. Lunev82581752008-04-03 14:27:26 -070085static struct sock *sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87static struct sctp_pf *sctp_pf_inet6_specific;
88static struct sctp_pf *sctp_pf_inet_specific;
89static struct sctp_af *sctp_af_v4_specific;
90static struct sctp_af *sctp_af_v6_specific;
91
Christoph Lametere18b8902006-12-06 20:33:20 -080092struct kmem_cache *sctp_chunk_cachep __read_mostly;
93struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Eric Dumazet8d987e52010-11-09 23:24:26 +000095long sysctl_sctp_mem[3];
Vlad Yasevich007e3932007-09-16 16:04:37 -070096int sysctl_sctp_rmem[3];
97int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* Return the address of the control sock. */
100struct sock *sctp_get_ctl_sock(void)
101{
Denis V. Lunev82581752008-04-03 14:27:26 -0700102 return sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
105/* Set up the proc fs entry for the SCTP protocol. */
106static __init int sctp_proc_init(void)
107{
Eric Dumazet17483762008-11-25 21:16:35 -0800108 if (percpu_counter_init(&sctp_sockets_allocated, 0))
109 goto out_nomem;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700110#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!proc_net_sctp) {
Alexey Dobriyan99b76232009-03-25 22:48:06 +0300112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
113 if (!proc_net_sctp)
Eric Dumazet17483762008-11-25 21:16:35 -0800114 goto out_free_percpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116
117 if (sctp_snmp_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700118 goto out_snmp_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (sctp_eps_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700120 goto out_eps_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (sctp_assocs_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700122 goto out_assocs_proc_init;
Neil Horman20c2c1f2008-05-09 15:14:50 -0700123 if (sctp_remaddr_proc_init())
David S. Millercaea9022008-06-16 18:25:48 -0700124 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 return 0;
127
David S. Millercaea9022008-06-16 18:25:48 -0700128out_remaddr_proc_init:
Pavel Emelyanov3d00fb92008-06-17 15:54:14 -0700129 sctp_assocs_proc_exit();
Wei Yongjun80896a32008-06-16 16:59:55 -0700130out_assocs_proc_init:
131 sctp_eps_proc_exit();
132out_eps_proc_init:
133 sctp_snmp_proc_exit();
134out_snmp_proc_init:
135 if (proc_net_sctp) {
136 proc_net_sctp = NULL;
137 remove_proc_entry("sctp", init_net.proc_net);
138 }
Eric Dumazet17483762008-11-25 21:16:35 -0800139out_free_percpu:
140 percpu_counter_destroy(&sctp_sockets_allocated);
Florian Westphalc4e85f82008-07-18 23:03:44 -0700141#else
142 return 0;
143#endif /* CONFIG_PROC_FS */
Randy Dunlap157653c2008-11-27 15:30:53 -0800144
145out_nomem:
146 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900149/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * Note: Do not make this __exit as it is used in the init error
151 * path.
152 */
153static void sctp_proc_exit(void)
154{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700155#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
Neil Horman20c2c1f2008-05-09 15:14:50 -0700159 sctp_remaddr_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 if (proc_net_sctp) {
162 proc_net_sctp = NULL;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200163 remove_proc_entry("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
Florian Westphalc4e85f82008-07-18 23:03:44 -0700165#endif
Rafael Laufer418372b2009-08-07 05:17:17 +0000166 percpu_counter_destroy(&sctp_sockets_allocated);
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 list_add_tail(&addr->list, addrlist);
195 }
196 }
197
198 rcu_read_unlock();
199}
200
201/* Extract our IP addresses from the system and stash them in the
202 * protocol structure.
203 */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800204static void sctp_get_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 struct net_device *dev;
207 struct list_head *pos;
208 struct sctp_af *af;
209
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800210 rcu_read_lock();
211 for_each_netdev_rcu(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 __list_for_each(pos, &sctp_address_families) {
213 af = list_entry(pos, struct sctp_af, list);
214 af->copy_addrlist(&sctp_local_addr_list, dev);
215 }
216 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800217 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220/* Free the existing local addresses. */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800221static void sctp_free_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 struct sctp_sockaddr_entry *addr;
224 struct list_head *pos, *temp;
225
226 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
227 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
228 list_del(pos);
229 kfree(addr);
230 }
231}
232
Vlad Yasevich29303542007-09-16 16:02:12 -0700233void sctp_local_addr_free(struct rcu_head *head)
234{
235 struct sctp_sockaddr_entry *e = container_of(head,
236 struct sctp_sockaddr_entry, rcu);
237 kfree(e);
238}
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240/* Copy the local addresses which are valid for 'scope' into 'bp'. */
241int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
Al Virodd0fc662005-10-07 07:46:04 +0100242 gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 struct sctp_sockaddr_entry *addr;
245 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Vlad Yasevich29303542007-09-16 16:02:12 -0700247 rcu_read_lock();
248 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
249 if (!addr->valid)
250 continue;
Al Viro6244be42006-11-20 17:21:44 -0800251 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 /* Now that the address is in scope, check to see if
253 * the address type is really supported by the local
254 * sock as well as the remote peer.
255 */
Al Viro6244be42006-11-20 17:21:44 -0800256 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800258 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 (copy_flags & SCTP_ADDR6_ALLOWED) &&
260 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800261 error = sctp_add_bind_addr(bp, &addr->a,
262 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 if (error)
264 goto end_copy;
265 }
266 }
267 }
268
269end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700270 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return error;
272}
273
274/* Initialize a sctp_addr from in incoming skb. */
275static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
276 int is_saddr)
277{
278 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800279 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 struct sctphdr *sh;
281
282 port = &addr->v4.sin_port;
283 addr->v4.sin_family = AF_INET;
284
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300285 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800287 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700288 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800290 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700291 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
294}
295
296/* Initialize an sctp_addr from a socket. */
297static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
298{
299 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800300 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000301 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
304/* Initialize sk->sk_rcv_saddr from sctp_addr. */
305static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
306{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000307 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
310/* Initialize sk->sk_daddr from sctp_addr. */
311static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
312{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000313 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
316/* Initialize a sctp_addr from an address parameter. */
317static void sctp_v4_from_addr_param(union sctp_addr *addr,
318 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800319 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 addr->v4.sin_family = AF_INET;
322 addr->v4.sin_port = port;
323 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
324}
325
326/* Initialize an address parameter from a sctp_addr and return the length
327 * of the address parameter.
328 */
329static int sctp_v4_to_addr_param(const union sctp_addr *addr,
330 union sctp_addr_param *param)
331{
332 int length = sizeof(sctp_ipv4addr_param_t);
333
334 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800335 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900336 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 return length;
339}
340
341/* Initialize a sctp_addr from a dst_entry. */
342static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800343 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct rtable *rt = (struct rtable *)dst;
346 saddr->v4.sin_family = AF_INET;
347 saddr->v4.sin_port = port;
348 saddr->v4.sin_addr.s_addr = rt->rt_src;
349}
350
351/* Compare two addresses exactly. */
352static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
353 const union sctp_addr *addr2)
354{
355 if (addr1->sa.sa_family != addr2->sa.sa_family)
356 return 0;
357 if (addr1->v4.sin_port != addr2->v4.sin_port)
358 return 0;
359 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
360 return 0;
361
362 return 1;
363}
364
365/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800366static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
368 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700369 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 addr->v4.sin_port = port;
371}
372
373/* Is this a wildcard address? */
374static int sctp_v4_is_any(const union sctp_addr *addr)
375{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700376 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
379/* This function checks if the address is a valid address to be used for
380 * SCTP binding.
381 *
382 * Output:
383 * Return 0 - If the address is a non-unicast or an illegal address.
384 * Return 1 - If the address is a unicast.
385 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700386static int sctp_v4_addr_valid(union sctp_addr *addr,
387 struct sctp_sock *sp,
388 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700390 /* IPv4 addresses not allowed */
391 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
392 return 0;
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800395 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return 0;
397
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900398 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000399 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900400 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 return 1;
403}
404
405/* Should this be available for binding? */
406static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
407{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800408 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Al Viroe6f1ceb2008-03-17 22:44:53 -0700411 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700412 ret != RTN_LOCAL &&
413 !sp->inet.freebind &&
414 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700416
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700417 if (ipv6_only_sock(sctp_opt2sk(sp)))
418 return 0;
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 return 1;
421}
422
423/* Checking the loopback, private and other address scopes as defined in
424 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
425 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
426 *
427 * Level 0 - unusable SCTP addresses
428 * Level 1 - loopback address
429 * Level 2 - link-local addresses
430 * Level 3 - private addresses.
431 * Level 4 - global addresses
432 * For INIT and INIT-ACK address list, let L be the level of
433 * of requested destination address, sender and receiver
434 * SHOULD include all of its addresses with level greater
435 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530436 *
437 * IPv4 scoping can be controlled through sysctl option
438 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 */
440static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
441{
442 sctp_scope_t retval;
443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800445 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800447 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800449 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800451 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
452 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
453 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 retval = SCTP_SCOPE_PRIVATE;
455 } else {
456 retval = SCTP_SCOPE_GLOBAL;
457 }
458
459 return retval;
460}
461
462/* Returns a valid dst cache entry for the given source and destination ip
463 * addresses. If an association is passed, trys to get a dst entry with a
464 * source address that matches an address in the bind address list.
465 */
466static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
467 union sctp_addr *daddr,
468 union sctp_addr *saddr)
469{
470 struct rtable *rt;
471 struct flowi fl;
472 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 struct dst_entry *dst = NULL;
475 union sctp_addr dst_saddr;
476
477 memset(&fl, 0x0, sizeof(struct flowi));
478 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400479 fl.fl_ip_dport = daddr->v4.sin_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 fl.proto = IPPROTO_SCTP;
481 if (asoc) {
482 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
483 fl.oif = asoc->base.sk->sk_bound_dev_if;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400484 fl.fl_ip_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400486 if (saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 fl.fl4_src = saddr->v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400488 fl.fl_ip_sport = saddr->v4.sin_port;
489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Harvey Harrison21454aa2008-10-31 00:54:56 -0700491 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
492 __func__, &fl.fl4_dst, &fl.fl4_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Denis V. Lunevf2063512008-01-22 22:07:34 -0800494 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700495 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
497
498 /* If there is no association or if a source address is passed, no
499 * more validation is required.
500 */
501 if (!asoc || saddr)
502 goto out;
503
504 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 if (dst) {
507 /* Walk through the bind address list and look for a bind
508 * address that matches the source address of the returned dst.
509 */
Gui Jianfeng159c6be2008-06-04 12:38:07 -0700510 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700511 rcu_read_lock();
512 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800513 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700514 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800515 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 goto out_unlock;
517 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700518 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 /* None of the bound addresses match the source address of the
521 * dst. So release it.
522 */
523 dst_release(dst);
524 dst = NULL;
525 }
526
527 /* Walk through the bind address list and try to get a dst that
528 * matches a bind address as the source address.
529 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700530 rcu_read_lock();
531 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
532 if (!laddr->valid)
533 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800534 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800535 (AF_INET == laddr->a.sa.sa_family)) {
536 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400537 fl.fl_ip_sport = laddr->a.v4.sin_port;
Denis V. Lunevf2063512008-01-22 22:07:34 -0800538 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700539 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 goto out_unlock;
541 }
542 }
543 }
544
545out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700546 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547out:
548 if (dst)
Harvey Harrison21454aa2008-10-31 00:54:56 -0700549 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
550 &rt->rt_dst, &rt->rt_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 else
552 SCTP_DEBUG_PRINTK("NO ROUTE\n");
553
554 return dst;
555}
556
557/* For v4, the source address is cached in the route entry(dst). So no need
558 * to cache it separately and hence this is an empty routine.
559 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900560static void sctp_v4_get_saddr(struct sctp_sock *sk,
561 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct dst_entry *dst,
563 union sctp_addr *daddr,
564 union sctp_addr *saddr)
565{
566 struct rtable *rt = (struct rtable *)dst;
567
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800568 if (!asoc)
569 return;
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if (rt) {
572 saddr->v4.sin_family = AF_INET;
Al Virod3f7a542006-11-20 17:12:41 -0800573 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900574 saddr->v4.sin_addr.s_addr = rt->rt_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
576}
577
578/* What interface did this skb arrive on? */
579static int sctp_v4_skb_iif(const struct sk_buff *skb)
580{
Eric Dumazet511c3f92009-06-02 05:14:27 +0000581 return skb_rtable(skb)->rt_iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584/* Was this packet marked by Explicit Congestion Notification? */
585static int sctp_v4_is_ce(const struct sk_buff *skb)
586{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700587 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
590/* Create and initialize a new sk for the socket returned by accept(). */
591static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
592 struct sctp_association *asoc)
593{
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);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000596 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598 if (!newsk)
599 goto out;
600
601 sock_init_data(NULL, newsk);
602
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000603 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 sock_reset_flag(newsk, SOCK_ZAPPED);
605
606 newinet = inet_sk(newsk);
607
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000608 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700610 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 if (newsk->sk_prot->init(newsk)) {
613 sk_common_release(newsk);
614 newsk = NULL;
615 }
616
617out:
618 return newsk;
619}
620
621/* Map address, empty for v4 family */
622static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
623{
624 /* Empty */
625}
626
627/* Dump the v4 addr to the seq file. */
628static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
629{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700630 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
632
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700633static void sctp_v4_ecn_capable(struct sock *sk)
634{
635 INET_ECN_xmit(sk);
636}
637
Vlad Yasevich29303542007-09-16 16:02:12 -0700638/* Event handler for inet address addition/deletion events.
639 * The sctp_local_addr_list needs to be protocted by a spin lock since
640 * multiple notifiers (say IPv4 and IPv6) may be running at the same
641 * time and thus corrupt the list.
642 * The reader side is protected with RCU.
643 */
Adrian Bunk24123182006-12-20 16:08:22 -0800644static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
645 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800647 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700648 struct sctp_sockaddr_entry *addr = NULL;
649 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700650 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700652 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
Denis V. Lunev6133fb12008-02-28 20:46:17 -0800653 return NOTIFY_DONE;
654
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800655 switch (ev) {
656 case NETDEV_UP:
657 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
658 if (addr) {
659 addr->a.v4.sin_family = AF_INET;
660 addr->a.v4.sin_port = 0;
661 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700662 addr->valid = 1;
663 spin_lock_bh(&sctp_local_addr_lock);
664 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
665 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800666 }
667 break;
668 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700669 spin_lock_bh(&sctp_local_addr_lock);
670 list_for_each_entry_safe(addr, temp,
671 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700672 if (addr->a.sa.sa_family == AF_INET &&
673 addr->a.v4.sin_addr.s_addr ==
674 ifa->ifa_local) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700675 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700676 addr->valid = 0;
677 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800678 break;
679 }
680 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700681 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700682 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700683 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800684 break;
685 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 return NOTIFY_DONE;
688}
689
690/*
691 * Initialize the control inode/socket with a control endpoint data
692 * structure. This endpoint is reserved exclusively for the OOTB processing.
693 */
694static int sctp_ctl_sock_init(void)
695{
696 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800697 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 if (sctp_get_pf_specific(PF_INET6))
700 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700702 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700703 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800704
705 /* If IPv6 socket could not be created, try the IPv4 socket */
706 if (err < 0 && family == PF_INET6)
707 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
708 SOCK_SEQPACKET, IPPROTO_SCTP,
709 &init_net);
710
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000712 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 return err;
714 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 return 0;
716}
717
718/* Register address family specific functions. */
719int sctp_register_af(struct sctp_af *af)
720{
721 switch (af->sa_family) {
722 case AF_INET:
723 if (sctp_af_v4_specific)
724 return 0;
725 sctp_af_v4_specific = af;
726 break;
727 case AF_INET6:
728 if (sctp_af_v6_specific)
729 return 0;
730 sctp_af_v6_specific = af;
731 break;
732 default:
733 return 0;
734 }
735
736 INIT_LIST_HEAD(&af->list);
737 list_add_tail(&af->list, &sctp_address_families);
738 return 1;
739}
740
741/* Get the table of functions for manipulating a particular address
742 * family.
743 */
744struct sctp_af *sctp_get_af_specific(sa_family_t family)
745{
746 switch (family) {
747 case AF_INET:
748 return sctp_af_v4_specific;
749 case AF_INET6:
750 return sctp_af_v6_specific;
751 default:
752 return NULL;
753 }
754}
755
756/* Common code to initialize a AF_INET msg_name. */
757static void sctp_inet_msgname(char *msgname, int *addr_len)
758{
759 struct sockaddr_in *sin;
760
761 sin = (struct sockaddr_in *)msgname;
762 *addr_len = sizeof(struct sockaddr_in);
763 sin->sin_family = AF_INET;
764 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
765}
766
767/* Copy the primary address of the peer primary address as the msg_name. */
768static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
769 int *addr_len)
770{
771 struct sockaddr_in *sin, *sinfrom;
772
773 if (msgname) {
774 struct sctp_association *asoc;
775
776 asoc = event->asoc;
777 sctp_inet_msgname(msgname, addr_len);
778 sin = (struct sockaddr_in *)msgname;
779 sinfrom = &asoc->peer.primary_addr.v4;
780 sin->sin_port = htons(asoc->peer.port);
781 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
782 }
783}
784
785/* Initialize and copy out a msgname from an inbound skb. */
786static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
787{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300789 struct sctphdr *sh = sctp_hdr(skb);
790 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700794 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 }
796}
797
798/* Do we support this AF? */
799static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
800{
801 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000802 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803}
804
805/* Address matching with wildcards allowed. */
806static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
807 const union sctp_addr *addr2,
808 struct sctp_sock *opt)
809{
810 /* PF_INET only supports AF_INET addresses. */
811 if (addr1->sa.sa_family != addr2->sa.sa_family)
812 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700813 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
814 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 return 1;
816 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
817 return 1;
818
819 return 0;
820}
821
822/* Verify that provided sockaddr looks bindable. Common verification has
823 * already been taken care of.
824 */
825static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
826{
827 return sctp_v4_available(addr, opt);
828}
829
830/* Verify that sockaddr looks sendable. Common verification has already
831 * been taken care of.
832 */
833static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
834{
835 return 1;
836}
837
838/* Fill in Supported Address Type information for INIT and INIT-ACK
839 * chunks. Returns number of addresses supported.
840 */
841static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800842 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
844 types[0] = SCTP_PARAM_IPV4_ADDRESS;
845 return 1;
846}
847
848/* Wrapper routine that calls the ip transmit routine. */
849static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700850 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Herbert Xuf8803742008-08-03 21:15:08 -0700852 struct inet_sock *inet = inet_sk(skb->sk);
853
Harvey Harrison21454aa2008-10-31 00:54:56 -0700854 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800855 __func__, skb, skb->len,
Eric Dumazet511c3f92009-06-02 05:14:27 +0000856 &skb_rtable(skb)->rt_src,
857 &skb_rtable(skb)->rt_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Herbert Xuf8803742008-08-03 21:15:08 -0700859 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
860 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
Shan Wei4e15ed42010-04-15 16:43:08 +0000863 return ip_queue_xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864}
865
Neil Horman15efbe72008-02-15 09:53:59 -0500866static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868static struct sctp_pf sctp_pf_inet = {
869 .event_msgname = sctp_inet_event_msgname,
870 .skb_msgname = sctp_inet_skb_msgname,
871 .af_supported = sctp_inet_af_supported,
872 .cmp_addr = sctp_inet_cmp_addr,
873 .bind_verify = sctp_inet_bind_verify,
874 .send_verify = sctp_inet_send_verify,
875 .supported_addrs = sctp_inet_supported_addrs,
876 .create_accept_sk = sctp_v4_create_accept_sk,
877 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500878 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879};
880
881/* Notifier for inetaddr addition/deletion events. */
882static struct notifier_block sctp_inetaddr_notifier = {
883 .notifier_call = sctp_inetaddr_event,
884};
885
886/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800887static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800888 .family = PF_INET,
889 .owner = THIS_MODULE,
890 .release = inet_release, /* Needs to be wrapped... */
891 .bind = inet_bind,
892 .connect = inet_dgram_connect,
893 .socketpair = sock_no_socketpair,
894 .accept = inet_accept,
895 .getname = inet_getname, /* Semantics are different. */
896 .poll = sctp_poll,
897 .ioctl = inet_ioctl,
898 .listen = sctp_inet_listen,
899 .shutdown = inet_shutdown, /* Looks harmless. */
900 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
901 .getsockopt = sock_common_getsockopt,
902 .sendmsg = inet_sendmsg,
903 .recvmsg = sock_common_recvmsg,
904 .mmap = sock_no_mmap,
905 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800906#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800907 .compat_setsockopt = compat_sock_common_setsockopt,
908 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800909#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910};
911
912/* Registration with AF_INET family. */
913static struct inet_protosw sctp_seqpacket_protosw = {
914 .type = SOCK_SEQPACKET,
915 .protocol = IPPROTO_SCTP,
916 .prot = &sctp_prot,
917 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 .no_check = 0,
919 .flags = SCTP_PROTOSW_FLAG
920};
921static struct inet_protosw sctp_stream_protosw = {
922 .type = SOCK_STREAM,
923 .protocol = IPPROTO_SCTP,
924 .prot = &sctp_prot,
925 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 .no_check = 0,
927 .flags = SCTP_PROTOSW_FLAG
928};
929
930/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +0000931static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 .handler = sctp_rcv,
933 .err_handler = sctp_v4_err,
934 .no_policy = 1,
935};
936
937/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500938static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800939 .sa_family = AF_INET,
940 .sctp_xmit = sctp_v4_xmit,
941 .setsockopt = ip_setsockopt,
942 .getsockopt = ip_getsockopt,
943 .get_dst = sctp_v4_get_dst,
944 .get_saddr = sctp_v4_get_saddr,
945 .copy_addrlist = sctp_v4_copy_addrlist,
946 .from_skb = sctp_v4_from_skb,
947 .from_sk = sctp_v4_from_sk,
948 .to_sk_saddr = sctp_v4_to_sk_saddr,
949 .to_sk_daddr = sctp_v4_to_sk_daddr,
950 .from_addr_param = sctp_v4_from_addr_param,
951 .to_addr_param = sctp_v4_to_addr_param,
952 .dst_saddr = sctp_v4_dst_saddr,
953 .cmp_addr = sctp_v4_cmp_addr,
954 .addr_valid = sctp_v4_addr_valid,
955 .inaddr_any = sctp_v4_inaddr_any,
956 .is_any = sctp_v4_is_any,
957 .available = sctp_v4_available,
958 .scope = sctp_v4_scope,
959 .skb_iif = sctp_v4_skb_iif,
960 .is_ce = sctp_v4_is_ce,
961 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700962 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800963 .net_header_len = sizeof(struct iphdr),
964 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800965#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800966 .compat_setsockopt = compat_ip_setsockopt,
967 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800968#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969};
970
971struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
972
973 switch (family) {
974 case PF_INET:
975 return sctp_pf_inet_specific;
976 case PF_INET6:
977 return sctp_pf_inet6_specific;
978 default:
979 return NULL;
980 }
981}
982
983/* Register the PF specific function table. */
984int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
985{
986 switch (family) {
987 case PF_INET:
988 if (sctp_pf_inet_specific)
989 return 0;
990 sctp_pf_inet_specific = pf;
991 break;
992 case PF_INET6:
993 if (sctp_pf_inet6_specific)
994 return 0;
995 sctp_pf_inet6_specific = pf;
996 break;
997 default:
998 return 0;
999 }
1000 return 1;
1001}
1002
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001003static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
Tejun Heo7d720c32010-02-16 15:20:26 +00001005 return snmp_mib_init((void __percpu **)sctp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001006 sizeof(struct sctp_mib),
1007 __alignof__(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008}
1009
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001010static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011{
Tejun Heo7d720c32010-02-16 15:20:26 +00001012 snmp_mib_free((void __percpu **)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
Vlad Yasevich270637a2008-03-20 15:17:14 -07001015static void sctp_v4_pf_init(void)
1016{
1017 /* Initialize the SCTP specific PF functions. */
1018 sctp_register_pf(&sctp_pf_inet, PF_INET);
1019 sctp_register_af(&sctp_af_inet);
1020}
1021
1022static void sctp_v4_pf_exit(void)
1023{
1024 list_del(&sctp_af_inet.list);
1025}
1026
1027static int sctp_v4_protosw_init(void)
1028{
1029 int rc;
1030
1031 rc = proto_register(&sctp_prot, 1);
1032 if (rc)
1033 return rc;
1034
1035 /* Register SCTP(UDP and TCP style) with socket layer. */
1036 inet_register_protosw(&sctp_seqpacket_protosw);
1037 inet_register_protosw(&sctp_stream_protosw);
1038
1039 return 0;
1040}
1041
1042static void sctp_v4_protosw_exit(void)
1043{
1044 inet_unregister_protosw(&sctp_stream_protosw);
1045 inet_unregister_protosw(&sctp_seqpacket_protosw);
1046 proto_unregister(&sctp_prot);
1047}
1048
1049static int sctp_v4_add_protocol(void)
1050{
1051 /* Register notifier for inet address additions/deletions. */
1052 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1053
1054 /* Register SCTP with inet layer. */
1055 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1056 return -EAGAIN;
1057
1058 return 0;
1059}
1060
1061static void sctp_v4_del_protocol(void)
1062{
1063 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1064 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1065}
1066
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067/* Initialize the universe into something sensible. */
1068SCTP_STATIC __init int sctp_init(void)
1069{
1070 int i;
1071 int status = -EINVAL;
1072 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001073 unsigned long limit;
Vlad Yasevich845525a2008-07-18 23:08:21 -07001074 unsigned long nr_pages;
Neil Horman4d93df02007-08-15 16:07:44 -07001075 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 int order;
1077
1078 /* SCTP_DEBUG sanity check. */
1079 if (!sctp_sanity_check())
1080 goto out;
1081
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001082 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 status = -ENOBUFS;
1084 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1085 sizeof(struct sctp_bind_bucket),
1086 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001087 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001089 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1092 sizeof(struct sctp_chunk),
1093 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001094 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (!sctp_chunk_cachep)
1096 goto err_chunk_cachep;
1097
1098 /* Allocate and initialise sctp mibs. */
1099 status = init_sctp_mibs();
1100 if (status)
1101 goto err_init_mibs;
1102
1103 /* Initialize proc fs directory. */
1104 status = sctp_proc_init();
1105 if (status)
1106 goto err_init_proc;
1107
1108 /* Initialize object count debugging. */
1109 sctp_dbg_objcnt_init();
1110
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 /*
1112 * 14. Suggested SCTP Protocol Parameter Values
1113 */
1114 /* The following protocol parameters are RECOMMENDED: */
1115 /* RTO.Initial - 3 seconds */
1116 sctp_rto_initial = SCTP_RTO_INITIAL;
1117 /* RTO.Min - 1 second */
1118 sctp_rto_min = SCTP_RTO_MIN;
1119 /* RTO.Max - 60 seconds */
1120 sctp_rto_max = SCTP_RTO_MAX;
1121 /* RTO.Alpha - 1/8 */
1122 sctp_rto_alpha = SCTP_RTO_ALPHA;
1123 /* RTO.Beta - 1/4 */
1124 sctp_rto_beta = SCTP_RTO_BETA;
1125
1126 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001127 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
1129 /* Whether Cookie Preservative is enabled(1) or not(0) */
1130 sctp_cookie_preserve_enable = 1;
1131
1132 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001133 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
1135 /* Association.Max.Retrans - 10 attempts
1136 * Path.Max.Retrans - 5 attempts (per destination address)
1137 * Max.Init.Retransmits - 8 attempts
1138 */
1139 sctp_max_retrans_association = 10;
1140 sctp_max_retrans_path = 5;
1141 sctp_max_retrans_init = 8;
1142
Neil Horman4eb701d2005-04-28 12:02:04 -07001143 /* Sendbuffer growth - do per-socket accounting */
1144 sctp_sndbuf_policy = 0;
1145
Neil Horman049b3ff2005-11-11 16:08:24 -08001146 /* Rcvbuffer growth - do per-socket accounting */
1147 sctp_rcvbuf_policy = 0;
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001150 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1151
1152 /* delayed SACK timeout */
1153 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155 /* Implementation specific variables. */
1156
1157 /* Initialize default stream count setup information. */
1158 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1159 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1160
1161 /* Initialize handle used for association ids. */
1162 idr_init(&sctp_assocs_id);
1163
Neil Horman4d93df02007-08-15 16:07:44 -07001164 /* Set the pressure threshold to be a fraction of global memory that
1165 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1166 * memory, with a floor of 128 pages.
Uwe Kleine-König421f91d2010-06-11 12:17:00 +02001167 * Note this initializes the data in sctpv6_prot too
Neil Horman4d93df02007-08-15 16:07:44 -07001168 * Unabashedly stolen from tcp_init
1169 */
Vlad Yasevich845525a2008-07-18 23:08:21 -07001170 nr_pages = totalram_pages - totalhigh_pages;
1171 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1172 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
Neil Horman4d93df02007-08-15 16:07:44 -07001173 limit = max(limit, 128UL);
1174 sysctl_sctp_mem[0] = limit / 4 * 3;
1175 sysctl_sctp_mem[1] = limit;
1176 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1177
1178 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1179 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1180 max_share = min(4UL*1024*1024, limit);
1181
Vlad Yasevich845525a2008-07-18 23:08:21 -07001182 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Neil Horman4d93df02007-08-15 16:07:44 -07001183 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1184 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1185
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001186 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001187 sysctl_sctp_wmem[1] = 16*1024;
1188 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 /* Size and allocate the association hash table.
1191 * The methodology is similar to that of the tcp hash tables.
1192 */
Jan Beulich44813742009-09-21 17:03:05 -07001193 if (totalram_pages >= (128 * 1024))
1194 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 else
Jan Beulich44813742009-09-21 17:03:05 -07001196 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
1198 for (order = 0; (1UL << order) < goal; order++)
1199 ;
1200
1201 do {
1202 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1203 sizeof(struct sctp_hashbucket);
1204 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1205 continue;
1206 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1207 __get_free_pages(GFP_ATOMIC, order);
1208 } while (!sctp_assoc_hashtable && --order > 0);
1209 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001210 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 status = -ENOMEM;
1212 goto err_ahash_alloc;
1213 }
1214 for (i = 0; i < sctp_assoc_hashsize; i++) {
1215 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001216 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 }
1218
1219 /* Allocate and initialize the endpoint hash table. */
1220 sctp_ep_hashsize = 64;
1221 sctp_ep_hashtable = (struct sctp_hashbucket *)
1222 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1223 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001224 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 status = -ENOMEM;
1226 goto err_ehash_alloc;
1227 }
1228 for (i = 0; i < sctp_ep_hashsize; i++) {
1229 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001230 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 }
1232
1233 /* Allocate and initialize the SCTP port hash table. */
1234 do {
1235 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1236 sizeof(struct sctp_bind_hashbucket);
1237 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1238 continue;
1239 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1240 __get_free_pages(GFP_ATOMIC, order);
1241 } while (!sctp_port_hashtable && --order > 0);
1242 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001243 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 status = -ENOMEM;
1245 goto err_bhash_alloc;
1246 }
1247 for (i = 0; i < sctp_port_hashsize; i++) {
1248 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001249 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251
Joe Perches145ce502010-08-24 13:21:08 +00001252 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 sctp_assoc_hashsize, sctp_port_hashsize);
1254
1255 /* Disable ADDIP by default. */
1256 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001257 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
1259 /* Enable PR-SCTP by default. */
1260 sctp_prsctp_enable = 1;
1261
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001262 /* Disable AUTH by default. */
1263 sctp_auth_enable = 0;
1264
Bhaskar Dutta72388432009-09-03 17:25:47 +05301265 /* Set SCOPE policy to enabled */
1266 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1267
Vlad Yasevich90f2f532009-11-23 15:53:57 -05001268 /* Set the default rwnd update threshold */
1269 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1270
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 sctp_sysctl_register();
1272
1273 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001274 sctp_v4_pf_init();
1275 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
Vlad Yasevich270637a2008-03-20 15:17:14 -07001277 /* Initialize the local address list. */
1278 INIT_LIST_HEAD(&sctp_local_addr_list);
1279 spin_lock_init(&sctp_local_addr_lock);
1280 sctp_get_local_addr_list();
1281
1282 status = sctp_v4_protosw_init();
1283
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001284 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001285 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001286
Vlad Yasevich270637a2008-03-20 15:17:14 -07001287 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001289 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
1291 /* Initialize the control inode/socket for handling OOTB packets. */
1292 if ((status = sctp_ctl_sock_init())) {
Joe Perches145ce502010-08-24 13:21:08 +00001293 pr_err("Failed to initialize the SCTP control sock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 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");