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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
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233/* Copy the local addresses which are valid for 'scope' into 'bp'. */
234int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
Al Virodd0fc662005-10-07 07:46:04 +0100235 gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct sctp_sockaddr_entry *addr;
238 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Vlad Yasevich29303542007-09-16 16:02:12 -0700240 rcu_read_lock();
241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
242 if (!addr->valid)
243 continue;
Al Viro6244be42006-11-20 17:21:44 -0800244 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 /* Now that the address is in scope, check to see if
246 * the address type is really supported by the local
247 * sock as well as the remote peer.
248 */
Al Viro6244be42006-11-20 17:21:44 -0800249 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800251 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 (copy_flags & SCTP_ADDR6_ALLOWED) &&
253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800254 error = sctp_add_bind_addr(bp, &addr->a,
255 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (error)
257 goto end_copy;
258 }
259 }
260 }
261
262end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700263 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return error;
265}
266
267/* Initialize a sctp_addr from in incoming skb. */
268static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
269 int is_saddr)
270{
271 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800272 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 struct sctphdr *sh;
274
275 port = &addr->v4.sin_port;
276 addr->v4.sin_family = AF_INET;
277
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300278 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800280 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700281 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800283 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700284 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
287}
288
289/* Initialize an sctp_addr from a socket. */
290static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
291{
292 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800293 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
297/* Initialize sk->sk_rcv_saddr from sctp_addr. */
298static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
299{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303/* Initialize sk->sk_daddr from sctp_addr. */
304static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
305{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309/* Initialize a sctp_addr from an address parameter. */
310static void sctp_v4_from_addr_param(union sctp_addr *addr,
311 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800312 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_port = port;
316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
317}
318
319/* Initialize an address parameter from a sctp_addr and return the length
320 * of the address parameter.
321 */
322static int sctp_v4_to_addr_param(const union sctp_addr *addr,
323 union sctp_addr_param *param)
324{
325 int length = sizeof(sctp_ipv4addr_param_t);
326
327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800328 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 return length;
332}
333
334/* Initialize a sctp_addr from a dst_entry. */
335static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800336 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
338 struct rtable *rt = (struct rtable *)dst;
339 saddr->v4.sin_family = AF_INET;
340 saddr->v4.sin_port = port;
341 saddr->v4.sin_addr.s_addr = rt->rt_src;
342}
343
344/* Compare two addresses exactly. */
345static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
346 const union sctp_addr *addr2)
347{
348 if (addr1->sa.sa_family != addr2->sa.sa_family)
349 return 0;
350 if (addr1->v4.sin_port != addr2->v4.sin_port)
351 return 0;
352 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
353 return 0;
354
355 return 1;
356}
357
358/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800359static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700362 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 addr->v4.sin_port = port;
364}
365
366/* Is this a wildcard address? */
367static int sctp_v4_is_any(const union sctp_addr *addr)
368{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700369 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372/* This function checks if the address is a valid address to be used for
373 * SCTP binding.
374 *
375 * Output:
376 * Return 0 - If the address is a non-unicast or an illegal address.
377 * Return 1 - If the address is a unicast.
378 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700379static int sctp_v4_addr_valid(union sctp_addr *addr,
380 struct sctp_sock *sp,
381 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700383 /* IPv4 addresses not allowed */
384 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
385 return 0;
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800388 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return 0;
390
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900391 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000392 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900393 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return 1;
396}
397
398/* Should this be available for binding? */
399static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
400{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800401 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Al Viroe6f1ceb2008-03-17 22:44:53 -0700404 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700405 ret != RTN_LOCAL &&
406 !sp->inet.freebind &&
407 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700409
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700410 if (ipv6_only_sock(sctp_opt2sk(sp)))
411 return 0;
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return 1;
414}
415
416/* Checking the loopback, private and other address scopes as defined in
417 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
418 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
419 *
420 * Level 0 - unusable SCTP addresses
421 * Level 1 - loopback address
422 * Level 2 - link-local addresses
423 * Level 3 - private addresses.
424 * Level 4 - global addresses
425 * For INIT and INIT-ACK address list, let L be the level of
426 * of requested destination address, sender and receiver
427 * SHOULD include all of its addresses with level greater
428 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530429 *
430 * IPv4 scoping can be controlled through sysctl option
431 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 */
433static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
434{
435 sctp_scope_t retval;
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800438 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800440 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800442 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800444 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
445 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
446 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 retval = SCTP_SCOPE_PRIVATE;
448 } else {
449 retval = SCTP_SCOPE_GLOBAL;
450 }
451
452 return retval;
453}
454
455/* Returns a valid dst cache entry for the given source and destination ip
456 * addresses. If an association is passed, trys to get a dst entry with a
457 * source address that matches an address in the bind address list.
458 */
459static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
460 union sctp_addr *daddr,
461 union sctp_addr *saddr)
462{
463 struct rtable *rt;
David S. Miller9d6ec932011-03-12 01:12:47 -0500464 struct flowi4 fl4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 struct dst_entry *dst = NULL;
468 union sctp_addr dst_saddr;
469
David S. Miller9d6ec932011-03-12 01:12:47 -0500470 memset(&fl4, 0x0, sizeof(struct flowi4));
471 fl4.daddr = daddr->v4.sin_addr.s_addr;
David S. Miller9cce96d2011-03-12 03:00:33 -0500472 fl4.fl4_dport = daddr->v4.sin_port;
David S. Miller9d6ec932011-03-12 01:12:47 -0500473 fl4.flowi4_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (asoc) {
David S. Miller9d6ec932011-03-12 01:12:47 -0500475 fl4.flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
476 fl4.flowi4_oif = asoc->base.sk->sk_bound_dev_if;
David S. Miller9cce96d2011-03-12 03:00:33 -0500477 fl4.fl4_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400479 if (saddr) {
David S. Miller9d6ec932011-03-12 01:12:47 -0500480 fl4.saddr = saddr->v4.sin_addr.s_addr;
David S. Miller9cce96d2011-03-12 03:00:33 -0500481 fl4.fl4_sport = saddr->v4.sin_port;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Harvey Harrison21454aa2008-10-31 00:54:56 -0700484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
David S. Miller9d6ec932011-03-12 01:12:47 -0500485 __func__, &fl4.daddr, &fl4.saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
David S. Miller9d6ec932011-03-12 01:12:47 -0500487 rt = ip_route_output_key(&init_net, &fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800488 if (!IS_ERR(rt))
Changli Gaod8d1f302010-06-10 23:31:35 -0700489 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 /* If there is no association or if a source address is passed, no
492 * more validation is required.
493 */
494 if (!asoc || saddr)
495 goto out;
496
497 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 if (dst) {
500 /* Walk through the bind address list and look for a bind
501 * address that matches the source address of the returned dst.
502 */
Gui Jianfeng159c6be2008-06-04 12:38:07 -0700503 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800506 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700507 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800508 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 goto out_unlock;
510 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700511 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 /* None of the bound addresses match the source address of the
514 * dst. So release it.
515 */
516 dst_release(dst);
517 dst = NULL;
518 }
519
520 /* Walk through the bind address list and try to get a dst that
521 * matches a bind address as the source address.
522 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700523 rcu_read_lock();
524 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
525 if (!laddr->valid)
526 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800527 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800528 (AF_INET == laddr->a.sa.sa_family)) {
David S. Miller9d6ec932011-03-12 01:12:47 -0500529 fl4.saddr = laddr->a.v4.sin_addr.s_addr;
David S. Miller9cce96d2011-03-12 03:00:33 -0500530 fl4.fl4_sport = laddr->a.v4.sin_port;
David S. Miller9d6ec932011-03-12 01:12:47 -0500531 rt = ip_route_output_key(&init_net, &fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800532 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700533 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 goto out_unlock;
535 }
536 }
537 }
538
539out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700540 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541out:
542 if (dst)
Harvey Harrison21454aa2008-10-31 00:54:56 -0700543 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
544 &rt->rt_dst, &rt->rt_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 else
546 SCTP_DEBUG_PRINTK("NO ROUTE\n");
547
548 return dst;
549}
550
551/* For v4, the source address is cached in the route entry(dst). So no need
552 * to cache it separately and hence this is an empty routine.
553 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900554static void sctp_v4_get_saddr(struct sctp_sock *sk,
555 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 struct dst_entry *dst,
557 union sctp_addr *daddr,
558 union sctp_addr *saddr)
559{
560 struct rtable *rt = (struct rtable *)dst;
561
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800562 if (!asoc)
563 return;
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 if (rt) {
566 saddr->v4.sin_family = AF_INET;
Al Virod3f7a542006-11-20 17:12:41 -0800567 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900568 saddr->v4.sin_addr.s_addr = rt->rt_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 }
570}
571
572/* What interface did this skb arrive on? */
573static int sctp_v4_skb_iif(const struct sk_buff *skb)
574{
Eric Dumazet511c3f92009-06-02 05:14:27 +0000575 return skb_rtable(skb)->rt_iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576}
577
578/* Was this packet marked by Explicit Congestion Notification? */
579static int sctp_v4_is_ce(const struct sk_buff *skb)
580{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700581 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584/* Create and initialize a new sk for the socket returned by accept(). */
585static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
586 struct sctp_association *asoc)
587{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900588 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700589 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000590 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 if (!newsk)
593 goto out;
594
595 sock_init_data(NULL, newsk);
596
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000597 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 sock_reset_flag(newsk, SOCK_ZAPPED);
599
600 newinet = inet_sk(newsk);
601
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000602 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700604 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606 if (newsk->sk_prot->init(newsk)) {
607 sk_common_release(newsk);
608 newsk = NULL;
609 }
610
611out:
612 return newsk;
613}
614
615/* Map address, empty for v4 family */
616static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
617{
618 /* Empty */
619}
620
621/* Dump the v4 addr to the seq file. */
622static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
623{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700624 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700627static void sctp_v4_ecn_capable(struct sock *sk)
628{
629 INET_ECN_xmit(sk);
630}
631
Vlad Yasevich29303542007-09-16 16:02:12 -0700632/* Event handler for inet address addition/deletion events.
633 * The sctp_local_addr_list needs to be protocted by a spin lock since
634 * multiple notifiers (say IPv4 and IPv6) may be running at the same
635 * time and thus corrupt the list.
636 * The reader side is protected with RCU.
637 */
Adrian Bunk24123182006-12-20 16:08:22 -0800638static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
639 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800641 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700642 struct sctp_sockaddr_entry *addr = NULL;
643 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700644 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700646 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
Denis V. Lunev6133fb12008-02-28 20:46:17 -0800647 return NOTIFY_DONE;
648
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800649 switch (ev) {
650 case NETDEV_UP:
651 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
652 if (addr) {
653 addr->a.v4.sin_family = AF_INET;
654 addr->a.v4.sin_port = 0;
655 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700656 addr->valid = 1;
657 spin_lock_bh(&sctp_local_addr_lock);
658 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
659 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800660 }
661 break;
662 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700663 spin_lock_bh(&sctp_local_addr_lock);
664 list_for_each_entry_safe(addr, temp,
665 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700666 if (addr->a.sa.sa_family == AF_INET &&
667 addr->a.v4.sin_addr.s_addr ==
668 ifa->ifa_local) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700669 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700670 addr->valid = 0;
671 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800672 break;
673 }
674 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700675 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700676 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800677 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800678 break;
679 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 return NOTIFY_DONE;
682}
683
684/*
685 * Initialize the control inode/socket with a control endpoint data
686 * structure. This endpoint is reserved exclusively for the OOTB processing.
687 */
688static int sctp_ctl_sock_init(void)
689{
690 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800691 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 if (sctp_get_pf_specific(PF_INET6))
694 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700696 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700697 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800698
699 /* If IPv6 socket could not be created, try the IPv4 socket */
700 if (err < 0 && family == PF_INET6)
701 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
702 SOCK_SEQPACKET, IPPROTO_SCTP,
703 &init_net);
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000706 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return err;
708 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 return 0;
710}
711
712/* Register address family specific functions. */
713int sctp_register_af(struct sctp_af *af)
714{
715 switch (af->sa_family) {
716 case AF_INET:
717 if (sctp_af_v4_specific)
718 return 0;
719 sctp_af_v4_specific = af;
720 break;
721 case AF_INET6:
722 if (sctp_af_v6_specific)
723 return 0;
724 sctp_af_v6_specific = af;
725 break;
726 default:
727 return 0;
728 }
729
730 INIT_LIST_HEAD(&af->list);
731 list_add_tail(&af->list, &sctp_address_families);
732 return 1;
733}
734
735/* Get the table of functions for manipulating a particular address
736 * family.
737 */
738struct sctp_af *sctp_get_af_specific(sa_family_t family)
739{
740 switch (family) {
741 case AF_INET:
742 return sctp_af_v4_specific;
743 case AF_INET6:
744 return sctp_af_v6_specific;
745 default:
746 return NULL;
747 }
748}
749
750/* Common code to initialize a AF_INET msg_name. */
751static void sctp_inet_msgname(char *msgname, int *addr_len)
752{
753 struct sockaddr_in *sin;
754
755 sin = (struct sockaddr_in *)msgname;
756 *addr_len = sizeof(struct sockaddr_in);
757 sin->sin_family = AF_INET;
758 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
759}
760
761/* Copy the primary address of the peer primary address as the msg_name. */
762static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
763 int *addr_len)
764{
765 struct sockaddr_in *sin, *sinfrom;
766
767 if (msgname) {
768 struct sctp_association *asoc;
769
770 asoc = event->asoc;
771 sctp_inet_msgname(msgname, addr_len);
772 sin = (struct sockaddr_in *)msgname;
773 sinfrom = &asoc->peer.primary_addr.v4;
774 sin->sin_port = htons(asoc->peer.port);
775 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
776 }
777}
778
779/* Initialize and copy out a msgname from an inbound skb. */
780static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
781{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300783 struct sctphdr *sh = sctp_hdr(skb);
784 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
785
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700788 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
790}
791
792/* Do we support this AF? */
793static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
794{
795 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000796 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797}
798
799/* Address matching with wildcards allowed. */
800static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
801 const union sctp_addr *addr2,
802 struct sctp_sock *opt)
803{
804 /* PF_INET only supports AF_INET addresses. */
805 if (addr1->sa.sa_family != addr2->sa.sa_family)
806 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700807 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
808 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 return 1;
810 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
811 return 1;
812
813 return 0;
814}
815
816/* Verify that provided sockaddr looks bindable. Common verification has
817 * already been taken care of.
818 */
819static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
820{
821 return sctp_v4_available(addr, opt);
822}
823
824/* Verify that sockaddr looks sendable. Common verification has already
825 * been taken care of.
826 */
827static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
828{
829 return 1;
830}
831
832/* Fill in Supported Address Type information for INIT and INIT-ACK
833 * chunks. Returns number of addresses supported.
834 */
835static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800836 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
838 types[0] = SCTP_PARAM_IPV4_ADDRESS;
839 return 1;
840}
841
842/* Wrapper routine that calls the ip transmit routine. */
843static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700844 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845{
Herbert Xuf8803742008-08-03 21:15:08 -0700846 struct inet_sock *inet = inet_sk(skb->sk);
847
Harvey Harrison21454aa2008-10-31 00:54:56 -0700848 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800849 __func__, skb, skb->len,
Eric Dumazet511c3f92009-06-02 05:14:27 +0000850 &skb_rtable(skb)->rt_src,
851 &skb_rtable(skb)->rt_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Herbert Xuf8803742008-08-03 21:15:08 -0700853 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
854 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
Shan Wei4e15ed42010-04-15 16:43:08 +0000857 return ip_queue_xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858}
859
Neil Horman15efbe72008-02-15 09:53:59 -0500860static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862static struct sctp_pf sctp_pf_inet = {
863 .event_msgname = sctp_inet_event_msgname,
864 .skb_msgname = sctp_inet_skb_msgname,
865 .af_supported = sctp_inet_af_supported,
866 .cmp_addr = sctp_inet_cmp_addr,
867 .bind_verify = sctp_inet_bind_verify,
868 .send_verify = sctp_inet_send_verify,
869 .supported_addrs = sctp_inet_supported_addrs,
870 .create_accept_sk = sctp_v4_create_accept_sk,
871 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500872 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873};
874
875/* Notifier for inetaddr addition/deletion events. */
876static struct notifier_block sctp_inetaddr_notifier = {
877 .notifier_call = sctp_inetaddr_event,
878};
879
880/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800881static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800882 .family = PF_INET,
883 .owner = THIS_MODULE,
884 .release = inet_release, /* Needs to be wrapped... */
885 .bind = inet_bind,
886 .connect = inet_dgram_connect,
887 .socketpair = sock_no_socketpair,
888 .accept = inet_accept,
889 .getname = inet_getname, /* Semantics are different. */
890 .poll = sctp_poll,
891 .ioctl = inet_ioctl,
892 .listen = sctp_inet_listen,
893 .shutdown = inet_shutdown, /* Looks harmless. */
894 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
895 .getsockopt = sock_common_getsockopt,
896 .sendmsg = inet_sendmsg,
897 .recvmsg = sock_common_recvmsg,
898 .mmap = sock_no_mmap,
899 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800900#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800901 .compat_setsockopt = compat_sock_common_setsockopt,
902 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800903#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904};
905
906/* Registration with AF_INET family. */
907static struct inet_protosw sctp_seqpacket_protosw = {
908 .type = SOCK_SEQPACKET,
909 .protocol = IPPROTO_SCTP,
910 .prot = &sctp_prot,
911 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 .no_check = 0,
913 .flags = SCTP_PROTOSW_FLAG
914};
915static struct inet_protosw sctp_stream_protosw = {
916 .type = SOCK_STREAM,
917 .protocol = IPPROTO_SCTP,
918 .prot = &sctp_prot,
919 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 .no_check = 0,
921 .flags = SCTP_PROTOSW_FLAG
922};
923
924/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +0000925static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 .handler = sctp_rcv,
927 .err_handler = sctp_v4_err,
928 .no_policy = 1,
929};
930
931/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500932static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800933 .sa_family = AF_INET,
934 .sctp_xmit = sctp_v4_xmit,
935 .setsockopt = ip_setsockopt,
936 .getsockopt = ip_getsockopt,
937 .get_dst = sctp_v4_get_dst,
938 .get_saddr = sctp_v4_get_saddr,
939 .copy_addrlist = sctp_v4_copy_addrlist,
940 .from_skb = sctp_v4_from_skb,
941 .from_sk = sctp_v4_from_sk,
942 .to_sk_saddr = sctp_v4_to_sk_saddr,
943 .to_sk_daddr = sctp_v4_to_sk_daddr,
944 .from_addr_param = sctp_v4_from_addr_param,
945 .to_addr_param = sctp_v4_to_addr_param,
946 .dst_saddr = sctp_v4_dst_saddr,
947 .cmp_addr = sctp_v4_cmp_addr,
948 .addr_valid = sctp_v4_addr_valid,
949 .inaddr_any = sctp_v4_inaddr_any,
950 .is_any = sctp_v4_is_any,
951 .available = sctp_v4_available,
952 .scope = sctp_v4_scope,
953 .skb_iif = sctp_v4_skb_iif,
954 .is_ce = sctp_v4_is_ce,
955 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700956 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800957 .net_header_len = sizeof(struct iphdr),
958 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800959#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800960 .compat_setsockopt = compat_ip_setsockopt,
961 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800962#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963};
964
965struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
966
967 switch (family) {
968 case PF_INET:
969 return sctp_pf_inet_specific;
970 case PF_INET6:
971 return sctp_pf_inet6_specific;
972 default:
973 return NULL;
974 }
975}
976
977/* Register the PF specific function table. */
978int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
979{
980 switch (family) {
981 case PF_INET:
982 if (sctp_pf_inet_specific)
983 return 0;
984 sctp_pf_inet_specific = pf;
985 break;
986 case PF_INET6:
987 if (sctp_pf_inet6_specific)
988 return 0;
989 sctp_pf_inet6_specific = pf;
990 break;
991 default:
992 return 0;
993 }
994 return 1;
995}
996
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -0700997static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998{
Tejun Heo7d720c32010-02-16 15:20:26 +0000999 return snmp_mib_init((void __percpu **)sctp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001000 sizeof(struct sctp_mib),
1001 __alignof__(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002}
1003
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001004static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005{
Tejun Heo7d720c32010-02-16 15:20:26 +00001006 snmp_mib_free((void __percpu **)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007}
1008
Vlad Yasevich270637a2008-03-20 15:17:14 -07001009static void sctp_v4_pf_init(void)
1010{
1011 /* Initialize the SCTP specific PF functions. */
1012 sctp_register_pf(&sctp_pf_inet, PF_INET);
1013 sctp_register_af(&sctp_af_inet);
1014}
1015
1016static void sctp_v4_pf_exit(void)
1017{
1018 list_del(&sctp_af_inet.list);
1019}
1020
1021static int sctp_v4_protosw_init(void)
1022{
1023 int rc;
1024
1025 rc = proto_register(&sctp_prot, 1);
1026 if (rc)
1027 return rc;
1028
1029 /* Register SCTP(UDP and TCP style) with socket layer. */
1030 inet_register_protosw(&sctp_seqpacket_protosw);
1031 inet_register_protosw(&sctp_stream_protosw);
1032
1033 return 0;
1034}
1035
1036static void sctp_v4_protosw_exit(void)
1037{
1038 inet_unregister_protosw(&sctp_stream_protosw);
1039 inet_unregister_protosw(&sctp_seqpacket_protosw);
1040 proto_unregister(&sctp_prot);
1041}
1042
1043static int sctp_v4_add_protocol(void)
1044{
1045 /* Register notifier for inet address additions/deletions. */
1046 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1047
1048 /* Register SCTP with inet layer. */
1049 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1050 return -EAGAIN;
1051
1052 return 0;
1053}
1054
1055static void sctp_v4_del_protocol(void)
1056{
1057 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1058 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1059}
1060
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061/* Initialize the universe into something sensible. */
1062SCTP_STATIC __init int sctp_init(void)
1063{
1064 int i;
1065 int status = -EINVAL;
1066 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001067 unsigned long limit;
Vlad Yasevich845525a2008-07-18 23:08:21 -07001068 unsigned long nr_pages;
Neil Horman4d93df02007-08-15 16:07:44 -07001069 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 int order;
1071
1072 /* SCTP_DEBUG sanity check. */
1073 if (!sctp_sanity_check())
1074 goto out;
1075
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001076 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 status = -ENOBUFS;
1078 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1079 sizeof(struct sctp_bind_bucket),
1080 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001081 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001083 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084
1085 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1086 sizeof(struct sctp_chunk),
1087 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001088 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (!sctp_chunk_cachep)
1090 goto err_chunk_cachep;
1091
1092 /* Allocate and initialise sctp mibs. */
1093 status = init_sctp_mibs();
1094 if (status)
1095 goto err_init_mibs;
1096
1097 /* Initialize proc fs directory. */
1098 status = sctp_proc_init();
1099 if (status)
1100 goto err_init_proc;
1101
1102 /* Initialize object count debugging. */
1103 sctp_dbg_objcnt_init();
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 /*
1106 * 14. Suggested SCTP Protocol Parameter Values
1107 */
1108 /* The following protocol parameters are RECOMMENDED: */
1109 /* RTO.Initial - 3 seconds */
1110 sctp_rto_initial = SCTP_RTO_INITIAL;
1111 /* RTO.Min - 1 second */
1112 sctp_rto_min = SCTP_RTO_MIN;
1113 /* RTO.Max - 60 seconds */
1114 sctp_rto_max = SCTP_RTO_MAX;
1115 /* RTO.Alpha - 1/8 */
1116 sctp_rto_alpha = SCTP_RTO_ALPHA;
1117 /* RTO.Beta - 1/4 */
1118 sctp_rto_beta = SCTP_RTO_BETA;
1119
1120 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001121 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
1123 /* Whether Cookie Preservative is enabled(1) or not(0) */
1124 sctp_cookie_preserve_enable = 1;
1125
1126 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001127 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
1129 /* Association.Max.Retrans - 10 attempts
1130 * Path.Max.Retrans - 5 attempts (per destination address)
1131 * Max.Init.Retransmits - 8 attempts
1132 */
1133 sctp_max_retrans_association = 10;
1134 sctp_max_retrans_path = 5;
1135 sctp_max_retrans_init = 8;
1136
Neil Horman4eb701d2005-04-28 12:02:04 -07001137 /* Sendbuffer growth - do per-socket accounting */
1138 sctp_sndbuf_policy = 0;
1139
Neil Horman049b3ff2005-11-11 16:08:24 -08001140 /* Rcvbuffer growth - do per-socket accounting */
1141 sctp_rcvbuf_policy = 0;
1142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001144 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1145
1146 /* delayed SACK timeout */
1147 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149 /* Implementation specific variables. */
1150
1151 /* Initialize default stream count setup information. */
1152 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1153 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1154
1155 /* Initialize handle used for association ids. */
1156 idr_init(&sctp_assocs_id);
1157
Neil Horman4d93df02007-08-15 16:07:44 -07001158 /* Set the pressure threshold to be a fraction of global memory that
1159 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1160 * memory, with a floor of 128 pages.
Uwe Kleine-König421f91d2010-06-11 12:17:00 +02001161 * Note this initializes the data in sctpv6_prot too
Neil Horman4d93df02007-08-15 16:07:44 -07001162 * Unabashedly stolen from tcp_init
1163 */
Vlad Yasevich845525a2008-07-18 23:08:21 -07001164 nr_pages = totalram_pages - totalhigh_pages;
1165 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1166 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
Neil Horman4d93df02007-08-15 16:07:44 -07001167 limit = max(limit, 128UL);
1168 sysctl_sctp_mem[0] = limit / 4 * 3;
1169 sysctl_sctp_mem[1] = limit;
1170 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1171
1172 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1173 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1174 max_share = min(4UL*1024*1024, limit);
1175
Vlad Yasevich845525a2008-07-18 23:08:21 -07001176 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Neil Horman4d93df02007-08-15 16:07:44 -07001177 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1178 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1179
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001180 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001181 sysctl_sctp_wmem[1] = 16*1024;
1182 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 /* Size and allocate the association hash table.
1185 * The methodology is similar to that of the tcp hash tables.
1186 */
Jan Beulich44813742009-09-21 17:03:05 -07001187 if (totalram_pages >= (128 * 1024))
1188 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 else
Jan Beulich44813742009-09-21 17:03:05 -07001190 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
1192 for (order = 0; (1UL << order) < goal; order++)
1193 ;
1194
1195 do {
1196 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1197 sizeof(struct sctp_hashbucket);
1198 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1199 continue;
1200 sctp_assoc_hashtable = (struct sctp_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001201 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 } while (!sctp_assoc_hashtable && --order > 0);
1203 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001204 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 status = -ENOMEM;
1206 goto err_ahash_alloc;
1207 }
1208 for (i = 0; i < sctp_assoc_hashsize; i++) {
1209 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001210 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 }
1212
1213 /* Allocate and initialize the endpoint hash table. */
1214 sctp_ep_hashsize = 64;
1215 sctp_ep_hashtable = (struct sctp_hashbucket *)
1216 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1217 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001218 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 status = -ENOMEM;
1220 goto err_ehash_alloc;
1221 }
1222 for (i = 0; i < sctp_ep_hashsize; i++) {
1223 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001224 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 }
1226
1227 /* Allocate and initialize the SCTP port hash table. */
1228 do {
1229 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1230 sizeof(struct sctp_bind_hashbucket);
1231 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1232 continue;
1233 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001234 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 } while (!sctp_port_hashtable && --order > 0);
1236 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001237 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 status = -ENOMEM;
1239 goto err_bhash_alloc;
1240 }
1241 for (i = 0; i < sctp_port_hashsize; i++) {
1242 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001243 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 }
1245
Joe Perches145ce502010-08-24 13:21:08 +00001246 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 sctp_assoc_hashsize, sctp_port_hashsize);
1248
1249 /* Disable ADDIP by default. */
1250 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001251 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 /* Enable PR-SCTP by default. */
1254 sctp_prsctp_enable = 1;
1255
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001256 /* Disable AUTH by default. */
1257 sctp_auth_enable = 0;
1258
Bhaskar Dutta72388432009-09-03 17:25:47 +05301259 /* Set SCOPE policy to enabled */
1260 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1261
Vlad Yasevich90f2f532009-11-23 15:53:57 -05001262 /* Set the default rwnd update threshold */
1263 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 sctp_sysctl_register();
1266
1267 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001268 sctp_v4_pf_init();
1269 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
Vlad Yasevich270637a2008-03-20 15:17:14 -07001271 /* Initialize the local address list. */
1272 INIT_LIST_HEAD(&sctp_local_addr_list);
1273 spin_lock_init(&sctp_local_addr_lock);
1274 sctp_get_local_addr_list();
1275
1276 status = sctp_v4_protosw_init();
1277
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001278 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001279 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001280
Vlad Yasevich270637a2008-03-20 15:17:14 -07001281 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001283 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
1285 /* Initialize the control inode/socket for handling OOTB packets. */
1286 if ((status = sctp_ctl_sock_init())) {
Joe Perches145ce502010-08-24 13:21:08 +00001287 pr_err("Failed to initialize the SCTP control sock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 goto err_ctl_sock_init;
1289 }
1290
Vlad Yasevich270637a2008-03-20 15:17:14 -07001291 status = sctp_v4_add_protocol();
1292 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001293 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001294
1295 /* Register SCTP with inet6 layer. */
1296 status = sctp_v6_add_protocol();
1297 if (status)
1298 goto err_v6_add_protocol;
1299
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 status = 0;
1301out:
1302 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001303err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001304 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001305err_add_protocol:
Denis V. Lunev56772422008-04-03 14:28:30 -07001306 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307err_ctl_sock_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001308 sctp_v6_protosw_exit();
1309err_v6_protosw_init:
1310 sctp_v4_protosw_exit();
1311err_protosw_init:
1312 sctp_free_local_addr_list();
1313 sctp_v4_pf_exit();
1314 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 free_pages((unsigned long)sctp_port_hashtable,
1317 get_order(sctp_port_hashsize *
1318 sizeof(struct sctp_bind_hashbucket)));
1319err_bhash_alloc:
1320 kfree(sctp_ep_hashtable);
1321err_ehash_alloc:
1322 free_pages((unsigned long)sctp_assoc_hashtable,
1323 get_order(sctp_assoc_hashsize *
1324 sizeof(struct sctp_hashbucket)));
1325err_ahash_alloc:
1326 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001328err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 cleanup_sctp_mibs();
1330err_init_mibs:
1331 kmem_cache_destroy(sctp_chunk_cachep);
1332err_chunk_cachep:
1333 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 goto out;
1335}
1336
1337/* Exit handler for the SCTP protocol. */
1338SCTP_STATIC __exit void sctp_exit(void)
1339{
1340 /* BUG. This should probably do something useful like clean
1341 * up all the remaining associations and all that memory.
1342 */
1343
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001344 /* Unregister with inet6/inet layers. */
1345 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001346 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
1348 /* Free the control endpoint. */
Denis V. Lunev56772422008-04-03 14:28:30 -07001349 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
Vlad Yasevich270637a2008-03-20 15:17:14 -07001351 /* Free protosw registrations */
1352 sctp_v6_protosw_exit();
1353 sctp_v4_protosw_exit();
1354
1355 /* Free the local address list. */
1356 sctp_free_local_addr_list();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001357
1358 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001359 sctp_v6_pf_exit();
1360 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001361
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364 free_pages((unsigned long)sctp_assoc_hashtable,
1365 get_order(sctp_assoc_hashsize *
1366 sizeof(struct sctp_hashbucket)));
1367 kfree(sctp_ep_hashtable);
1368 free_pages((unsigned long)sctp_port_hashtable,
1369 get_order(sctp_port_hashsize *
1370 sizeof(struct sctp_bind_hashbucket)));
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 sctp_dbg_objcnt_exit();
1373 sctp_proc_exit();
1374 cleanup_sctp_mibs();
1375
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001376 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1377
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001378 kmem_cache_destroy(sctp_chunk_cachep);
1379 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380}
1381
1382module_init(sctp_init);
1383module_exit(sctp_exit);
1384
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001385/*
1386 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1387 */
1388MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001389MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1391MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
Lucas Nussbaum06e86802009-02-13 08:33:41 +00001392module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1393MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394MODULE_LICENSE("GPL");