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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 *
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
47 */
48
49#include <linux/module.h>
50#include <linux/init.h>
51#include <linux/netdevice.h>
52#include <linux/inetdevice.h>
53#include <linux/seq_file.h>
Neil Horman4d93df02007-08-15 16:07:44 -070054#include <linux/bootmem.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020055#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <net/protocol.h>
57#include <net/ip.h>
58#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020059#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <net/sctp/sctp.h>
61#include <net/addrconf.h>
62#include <net/inet_common.h>
63#include <net/inet_ecn.h>
64
65/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070066struct sctp_globals sctp_globals __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067struct proc_dir_entry *proc_net_sctp;
Eric Dumazetba899662005-08-26 12:05:31 -070068DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70struct idr sctp_assocs_id;
71DEFINE_SPINLOCK(sctp_assocs_id_lock);
72
73/* This is the global socket data structure used for responding to
74 * the Out-of-the-blue (OOTB) packets. A control sock will be created
75 * for this socket at the initialization time.
76 */
Denis V. Lunev82581752008-04-03 14:27:26 -070077static struct sock *sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79static struct sctp_pf *sctp_pf_inet6_specific;
80static struct sctp_pf *sctp_pf_inet_specific;
81static struct sctp_af *sctp_af_v4_specific;
82static struct sctp_af *sctp_af_v6_specific;
83
Christoph Lametere18b8902006-12-06 20:33:20 -080084struct kmem_cache *sctp_chunk_cachep __read_mostly;
85struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Vlad Yasevich007e3932007-09-16 16:04:37 -070087int sysctl_sctp_mem[3];
88int sysctl_sctp_rmem[3];
89int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/* Return the address of the control sock. */
92struct sock *sctp_get_ctl_sock(void)
93{
Denis V. Lunev82581752008-04-03 14:27:26 -070094 return sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
97/* Set up the proc fs entry for the SCTP protocol. */
98static __init int sctp_proc_init(void)
99{
100 if (!proc_net_sctp) {
101 struct proc_dir_entry *ent;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200102 ent = proc_mkdir("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (ent) {
104 ent->owner = THIS_MODULE;
105 proc_net_sctp = ent;
106 } else
107 goto out_nomem;
108 }
109
110 if (sctp_snmp_proc_init())
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900111 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (sctp_eps_proc_init())
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900113 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (sctp_assocs_proc_init())
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900115 goto out_nomem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 return 0;
118
119out_nomem:
120 return -ENOMEM;
121}
122
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900123/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * Note: Do not make this __exit as it is used in the init error
125 * path.
126 */
127static void sctp_proc_exit(void)
128{
129 sctp_snmp_proc_exit();
130 sctp_eps_proc_exit();
131 sctp_assocs_proc_exit();
132
133 if (proc_net_sctp) {
134 proc_net_sctp = NULL;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200135 remove_proc_entry("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
137}
138
139/* Private helper to extract ipv4 address and stash them in
140 * the protocol structure.
141 */
142static void sctp_v4_copy_addrlist(struct list_head *addrlist,
143 struct net_device *dev)
144{
145 struct in_device *in_dev;
146 struct in_ifaddr *ifa;
147 struct sctp_sockaddr_entry *addr;
148
149 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700150 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 rcu_read_unlock();
152 return;
153 }
154
155 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
156 /* Add the address to the local list. */
157 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
158 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800159 addr->a.v4.sin_family = AF_INET;
160 addr->a.v4.sin_port = 0;
161 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700162 addr->valid = 1;
163 INIT_LIST_HEAD(&addr->list);
164 INIT_RCU_HEAD(&addr->rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 list_add_tail(&addr->list, addrlist);
166 }
167 }
168
169 rcu_read_unlock();
170}
171
172/* Extract our IP addresses from the system and stash them in the
173 * protocol structure.
174 */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800175static void sctp_get_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 struct net_device *dev;
178 struct list_head *pos;
179 struct sctp_af *af;
180
181 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700182 for_each_netdev(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 __list_for_each(pos, &sctp_address_families) {
184 af = list_entry(pos, struct sctp_af, list);
185 af->copy_addrlist(&sctp_local_addr_list, dev);
186 }
187 }
188 read_unlock(&dev_base_lock);
189}
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191/* Free the existing local addresses. */
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800192static void sctp_free_local_addr_list(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
194 struct sctp_sockaddr_entry *addr;
195 struct list_head *pos, *temp;
196
197 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
198 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
199 list_del(pos);
200 kfree(addr);
201 }
202}
203
Vlad Yasevich29303542007-09-16 16:02:12 -0700204void sctp_local_addr_free(struct rcu_head *head)
205{
206 struct sctp_sockaddr_entry *e = container_of(head,
207 struct sctp_sockaddr_entry, rcu);
208 kfree(e);
209}
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211/* Copy the local addresses which are valid for 'scope' into 'bp'. */
212int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
Al Virodd0fc662005-10-07 07:46:04 +0100213 gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 struct sctp_sockaddr_entry *addr;
216 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Vlad Yasevich29303542007-09-16 16:02:12 -0700218 rcu_read_lock();
219 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
220 if (!addr->valid)
221 continue;
Al Viro6244be42006-11-20 17:21:44 -0800222 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 /* Now that the address is in scope, check to see if
224 * the address type is really supported by the local
225 * sock as well as the remote peer.
226 */
Al Viro6244be42006-11-20 17:21:44 -0800227 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800229 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 (copy_flags & SCTP_ADDR6_ALLOWED) &&
231 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800232 error = sctp_add_bind_addr(bp, &addr->a,
233 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (error)
235 goto end_copy;
236 }
237 }
238 }
239
240end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700241 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return error;
243}
244
245/* Initialize a sctp_addr from in incoming skb. */
246static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
247 int is_saddr)
248{
249 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800250 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct sctphdr *sh;
252
253 port = &addr->v4.sin_port;
254 addr->v4.sin_family = AF_INET;
255
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300256 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800258 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700259 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800261 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700262 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
265}
266
267/* Initialize an sctp_addr from a socket. */
268static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
269{
270 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800271 addr->v4.sin_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
273}
274
275/* Initialize sk->sk_rcv_saddr from sctp_addr. */
276static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
277{
278 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
279}
280
281/* Initialize sk->sk_daddr from sctp_addr. */
282static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
283{
284 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
285}
286
287/* Initialize a sctp_addr from an address parameter. */
288static void sctp_v4_from_addr_param(union sctp_addr *addr,
289 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800290 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
292 addr->v4.sin_family = AF_INET;
293 addr->v4.sin_port = port;
294 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
295}
296
297/* Initialize an address parameter from a sctp_addr and return the length
298 * of the address parameter.
299 */
300static int sctp_v4_to_addr_param(const union sctp_addr *addr,
301 union sctp_addr_param *param)
302{
303 int length = sizeof(sctp_ipv4addr_param_t);
304
305 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800306 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900307 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 return length;
310}
311
312/* Initialize a sctp_addr from a dst_entry. */
313static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800314 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
316 struct rtable *rt = (struct rtable *)dst;
317 saddr->v4.sin_family = AF_INET;
318 saddr->v4.sin_port = port;
319 saddr->v4.sin_addr.s_addr = rt->rt_src;
320}
321
322/* Compare two addresses exactly. */
323static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
324 const union sctp_addr *addr2)
325{
326 if (addr1->sa.sa_family != addr2->sa.sa_family)
327 return 0;
328 if (addr1->v4.sin_port != addr2->v4.sin_port)
329 return 0;
330 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
331 return 0;
332
333 return 1;
334}
335
336/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800337static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
339 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700340 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 addr->v4.sin_port = port;
342}
343
344/* Is this a wildcard address? */
345static int sctp_v4_is_any(const union sctp_addr *addr)
346{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700347 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
350/* This function checks if the address is a valid address to be used for
351 * SCTP binding.
352 *
353 * Output:
354 * Return 0 - If the address is a non-unicast or an illegal address.
355 * Return 1 - If the address is a unicast.
356 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700357static int sctp_v4_addr_valid(union sctp_addr *addr,
358 struct sctp_sock *sp,
359 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800362 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 return 0;
364
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900365 /* Is this a broadcast address? */
Eric Dumazetee6b9672008-03-05 18:30:47 -0800366 if (skb && skb->rtable->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900367 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return 1;
370}
371
372/* Should this be available for binding? */
373static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
374{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800375 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Al Viroe6f1ceb2008-03-17 22:44:53 -0700378 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700379 ret != RTN_LOCAL &&
380 !sp->inet.freebind &&
381 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return 1;
385}
386
387/* Checking the loopback, private and other address scopes as defined in
388 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
389 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
390 *
391 * Level 0 - unusable SCTP addresses
392 * Level 1 - loopback address
393 * Level 2 - link-local addresses
394 * Level 3 - private addresses.
395 * Level 4 - global addresses
396 * For INIT and INIT-ACK address list, let L be the level of
397 * of requested destination address, sender and receiver
398 * SHOULD include all of its addresses with level greater
399 * than or equal to L.
400 */
401static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
402{
403 sctp_scope_t retval;
404
405 /* Should IPv4 scoping be a sysctl configurable option
406 * so users can turn it off (default on) for certain
407 * unconventional networking environments?
408 */
409
410 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800411 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800413 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800415 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800417 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
418 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
419 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 retval = SCTP_SCOPE_PRIVATE;
421 } else {
422 retval = SCTP_SCOPE_GLOBAL;
423 }
424
425 return retval;
426}
427
428/* Returns a valid dst cache entry for the given source and destination ip
429 * addresses. If an association is passed, trys to get a dst entry with a
430 * source address that matches an address in the bind address list.
431 */
432static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
433 union sctp_addr *daddr,
434 union sctp_addr *saddr)
435{
436 struct rtable *rt;
437 struct flowi fl;
438 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 struct dst_entry *dst = NULL;
441 union sctp_addr dst_saddr;
442
443 memset(&fl, 0x0, sizeof(struct flowi));
444 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
445 fl.proto = IPPROTO_SCTP;
446 if (asoc) {
447 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
448 fl.oif = asoc->base.sk->sk_bound_dev_if;
449 }
450 if (saddr)
451 fl.fl4_src = saddr->v4.sin_addr.s_addr;
452
453 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800454 __func__, NIPQUAD(fl.fl4_dst),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 NIPQUAD(fl.fl4_src));
456
Denis V. Lunevf2063512008-01-22 22:07:34 -0800457 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 dst = &rt->u.dst;
459 }
460
461 /* If there is no association or if a source address is passed, no
462 * more validation is required.
463 */
464 if (!asoc || saddr)
465 goto out;
466
467 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 if (dst) {
470 /* Walk through the bind address list and look for a bind
471 * address that matches the source address of the returned dst.
472 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700473 rcu_read_lock();
474 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800475 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700476 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800477 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
478 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 goto out_unlock;
480 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700481 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 /* None of the bound addresses match the source address of the
484 * dst. So release it.
485 */
486 dst_release(dst);
487 dst = NULL;
488 }
489
490 /* Walk through the bind address list and try to get a dst that
491 * matches a bind address as the source address.
492 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700493 rcu_read_lock();
494 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
495 if (!laddr->valid)
496 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800497 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800498 (AF_INET == laddr->a.sa.sa_family)) {
499 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
Denis V. Lunevf2063512008-01-22 22:07:34 -0800500 if (!ip_route_output_key(&init_net, &rt, &fl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 dst = &rt->u.dst;
502 goto out_unlock;
503 }
504 }
505 }
506
507out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700508 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509out:
510 if (dst)
511 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900512 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 else
514 SCTP_DEBUG_PRINTK("NO ROUTE\n");
515
516 return dst;
517}
518
519/* For v4, the source address is cached in the route entry(dst). So no need
520 * to cache it separately and hence this is an empty routine.
521 */
522static void sctp_v4_get_saddr(struct sctp_association *asoc,
523 struct dst_entry *dst,
524 union sctp_addr *daddr,
525 union sctp_addr *saddr)
526{
527 struct rtable *rt = (struct rtable *)dst;
528
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800529 if (!asoc)
530 return;
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (rt) {
533 saddr->v4.sin_family = AF_INET;
Al Virod3f7a542006-11-20 17:12:41 -0800534 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900535 saddr->v4.sin_addr.s_addr = rt->rt_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
537}
538
539/* What interface did this skb arrive on? */
540static int sctp_v4_skb_iif(const struct sk_buff *skb)
541{
Eric Dumazetee6b9672008-03-05 18:30:47 -0800542 return skb->rtable->rt_iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543}
544
545/* Was this packet marked by Explicit Congestion Notification? */
546static int sctp_v4_is_ce(const struct sk_buff *skb)
547{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700548 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549}
550
551/* Create and initialize a new sk for the socket returned by accept(). */
552static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
553 struct sctp_association *asoc)
554{
555 struct inet_sock *inet = inet_sk(sk);
556 struct inet_sock *newinet;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900557 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700558 sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 if (!newsk)
561 goto out;
562
563 sock_init_data(NULL, newsk);
564
565 newsk->sk_type = SOCK_STREAM;
566
567 newsk->sk_no_check = sk->sk_no_check;
568 newsk->sk_reuse = sk->sk_reuse;
569 newsk->sk_shutdown = sk->sk_shutdown;
570
571 newsk->sk_destruct = inet_sock_destruct;
572 newsk->sk_family = PF_INET;
573 newsk->sk_protocol = IPPROTO_SCTP;
574 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
575 sock_reset_flag(newsk, SOCK_ZAPPED);
576
577 newinet = inet_sk(newsk);
578
579 /* Initialize sk's sport, dport, rcv_saddr and daddr for
580 * getsockname() and getpeername()
581 */
582 newinet->sport = inet->sport;
583 newinet->saddr = inet->saddr;
584 newinet->rcv_saddr = inet->rcv_saddr;
585 newinet->dport = htons(asoc->peer.port);
586 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
587 newinet->pmtudisc = inet->pmtudisc;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900588 newinet->id = asoc->next_tsn ^ jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 newinet->uc_ttl = -1;
591 newinet->mc_loop = 1;
592 newinet->mc_ttl = 1;
593 newinet->mc_index = 0;
594 newinet->mc_list = NULL;
595
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700596 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598 if (newsk->sk_prot->init(newsk)) {
599 sk_common_release(newsk);
600 newsk = NULL;
601 }
602
603out:
604 return newsk;
605}
606
607/* Map address, empty for v4 family */
608static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
609{
610 /* Empty */
611}
612
613/* Dump the v4 addr to the seq file. */
614static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
615{
616 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
617}
618
Vlad Yasevich29303542007-09-16 16:02:12 -0700619/* Event handler for inet address addition/deletion events.
620 * The sctp_local_addr_list needs to be protocted by a spin lock since
621 * multiple notifiers (say IPv4 and IPv6) may be running at the same
622 * time and thus corrupt the list.
623 * The reader side is protected with RCU.
624 */
Adrian Bunk24123182006-12-20 16:08:22 -0800625static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
626 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800628 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700629 struct sctp_sockaddr_entry *addr = NULL;
630 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700631 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900633 if (dev_net(ifa->ifa_dev->dev) != &init_net)
Denis V. Lunev6133fb12008-02-28 20:46:17 -0800634 return NOTIFY_DONE;
635
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800636 switch (ev) {
637 case NETDEV_UP:
638 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
639 if (addr) {
640 addr->a.v4.sin_family = AF_INET;
641 addr->a.v4.sin_port = 0;
642 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700643 addr->valid = 1;
644 spin_lock_bh(&sctp_local_addr_lock);
645 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
646 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800647 }
648 break;
649 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700650 spin_lock_bh(&sctp_local_addr_lock);
651 list_for_each_entry_safe(addr, temp,
652 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700653 if (addr->a.sa.sa_family == AF_INET &&
654 addr->a.v4.sin_addr.s_addr ==
655 ifa->ifa_local) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700656 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700657 addr->valid = 0;
658 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800659 break;
660 }
661 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700662 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700663 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700664 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800665 break;
666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 return NOTIFY_DONE;
669}
670
671/*
672 * Initialize the control inode/socket with a control endpoint data
673 * structure. This endpoint is reserved exclusively for the OOTB processing.
674 */
675static int sctp_ctl_sock_init(void)
676{
677 int err;
678 sa_family_t family;
679
680 if (sctp_get_pf_specific(PF_INET6))
681 family = PF_INET6;
682 else
683 family = PF_INET;
684
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700685 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700686 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 if (err < 0) {
688 printk(KERN_ERR
689 "SCTP: Failed to create the SCTP control socket.\n");
690 return err;
691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 return 0;
693}
694
695/* Register address family specific functions. */
696int sctp_register_af(struct sctp_af *af)
697{
698 switch (af->sa_family) {
699 case AF_INET:
700 if (sctp_af_v4_specific)
701 return 0;
702 sctp_af_v4_specific = af;
703 break;
704 case AF_INET6:
705 if (sctp_af_v6_specific)
706 return 0;
707 sctp_af_v6_specific = af;
708 break;
709 default:
710 return 0;
711 }
712
713 INIT_LIST_HEAD(&af->list);
714 list_add_tail(&af->list, &sctp_address_families);
715 return 1;
716}
717
718/* Get the table of functions for manipulating a particular address
719 * family.
720 */
721struct sctp_af *sctp_get_af_specific(sa_family_t family)
722{
723 switch (family) {
724 case AF_INET:
725 return sctp_af_v4_specific;
726 case AF_INET6:
727 return sctp_af_v6_specific;
728 default:
729 return NULL;
730 }
731}
732
733/* Common code to initialize a AF_INET msg_name. */
734static void sctp_inet_msgname(char *msgname, int *addr_len)
735{
736 struct sockaddr_in *sin;
737
738 sin = (struct sockaddr_in *)msgname;
739 *addr_len = sizeof(struct sockaddr_in);
740 sin->sin_family = AF_INET;
741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
742}
743
744/* Copy the primary address of the peer primary address as the msg_name. */
745static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
746 int *addr_len)
747{
748 struct sockaddr_in *sin, *sinfrom;
749
750 if (msgname) {
751 struct sctp_association *asoc;
752
753 asoc = event->asoc;
754 sctp_inet_msgname(msgname, addr_len);
755 sin = (struct sockaddr_in *)msgname;
756 sinfrom = &asoc->peer.primary_addr.v4;
757 sin->sin_port = htons(asoc->peer.port);
758 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
759 }
760}
761
762/* Initialize and copy out a msgname from an inbound skb. */
763static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
764{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300766 struct sctphdr *sh = sctp_hdr(skb);
767 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700771 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773}
774
775/* Do we support this AF? */
776static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
777{
778 /* PF_INET only supports AF_INET addresses. */
779 return (AF_INET == family);
780}
781
782/* Address matching with wildcards allowed. */
783static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
784 const union sctp_addr *addr2,
785 struct sctp_sock *opt)
786{
787 /* PF_INET only supports AF_INET addresses. */
788 if (addr1->sa.sa_family != addr2->sa.sa_family)
789 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700790 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
791 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return 1;
793 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
794 return 1;
795
796 return 0;
797}
798
799/* Verify that provided sockaddr looks bindable. Common verification has
800 * already been taken care of.
801 */
802static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
803{
804 return sctp_v4_available(addr, opt);
805}
806
807/* Verify that sockaddr looks sendable. Common verification has already
808 * been taken care of.
809 */
810static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
811{
812 return 1;
813}
814
815/* Fill in Supported Address Type information for INIT and INIT-ACK
816 * chunks. Returns number of addresses supported.
817 */
818static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800819 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
821 types[0] = SCTP_PARAM_IPV4_ADDRESS;
822 return 1;
823}
824
825/* Wrapper routine that calls the ip transmit routine. */
826static inline int sctp_v4_xmit(struct sk_buff *skb,
827 struct sctp_transport *transport, int ipfragok)
828{
829 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
830 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800831 __func__, skb, skb->len,
Eric Dumazetee6b9672008-03-05 18:30:47 -0800832 NIPQUAD(skb->rtable->rt_src),
833 NIPQUAD(skb->rtable->rt_dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
David S. Millere89862f2007-01-26 01:04:55 -0800836 return ip_queue_xmit(skb, ipfragok);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
838
Neil Horman15efbe72008-02-15 09:53:59 -0500839static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
841static struct sctp_pf sctp_pf_inet = {
842 .event_msgname = sctp_inet_event_msgname,
843 .skb_msgname = sctp_inet_skb_msgname,
844 .af_supported = sctp_inet_af_supported,
845 .cmp_addr = sctp_inet_cmp_addr,
846 .bind_verify = sctp_inet_bind_verify,
847 .send_verify = sctp_inet_send_verify,
848 .supported_addrs = sctp_inet_supported_addrs,
849 .create_accept_sk = sctp_v4_create_accept_sk,
850 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500851 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852};
853
854/* Notifier for inetaddr addition/deletion events. */
855static struct notifier_block sctp_inetaddr_notifier = {
856 .notifier_call = sctp_inetaddr_event,
857};
858
859/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800860static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800861 .family = PF_INET,
862 .owner = THIS_MODULE,
863 .release = inet_release, /* Needs to be wrapped... */
864 .bind = inet_bind,
865 .connect = inet_dgram_connect,
866 .socketpair = sock_no_socketpair,
867 .accept = inet_accept,
868 .getname = inet_getname, /* Semantics are different. */
869 .poll = sctp_poll,
870 .ioctl = inet_ioctl,
871 .listen = sctp_inet_listen,
872 .shutdown = inet_shutdown, /* Looks harmless. */
873 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
874 .getsockopt = sock_common_getsockopt,
875 .sendmsg = inet_sendmsg,
876 .recvmsg = sock_common_recvmsg,
877 .mmap = sock_no_mmap,
878 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800879#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800880 .compat_setsockopt = compat_sock_common_setsockopt,
881 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800882#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883};
884
885/* Registration with AF_INET family. */
886static struct inet_protosw sctp_seqpacket_protosw = {
887 .type = SOCK_SEQPACKET,
888 .protocol = IPPROTO_SCTP,
889 .prot = &sctp_prot,
890 .ops = &inet_seqpacket_ops,
891 .capability = -1,
892 .no_check = 0,
893 .flags = SCTP_PROTOSW_FLAG
894};
895static struct inet_protosw sctp_stream_protosw = {
896 .type = SOCK_STREAM,
897 .protocol = IPPROTO_SCTP,
898 .prot = &sctp_prot,
899 .ops = &inet_seqpacket_ops,
900 .capability = -1,
901 .no_check = 0,
902 .flags = SCTP_PROTOSW_FLAG
903};
904
905/* Register with IP layer. */
906static struct net_protocol sctp_protocol = {
907 .handler = sctp_rcv,
908 .err_handler = sctp_v4_err,
909 .no_policy = 1,
910};
911
912/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500913static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800914 .sa_family = AF_INET,
915 .sctp_xmit = sctp_v4_xmit,
916 .setsockopt = ip_setsockopt,
917 .getsockopt = ip_getsockopt,
918 .get_dst = sctp_v4_get_dst,
919 .get_saddr = sctp_v4_get_saddr,
920 .copy_addrlist = sctp_v4_copy_addrlist,
921 .from_skb = sctp_v4_from_skb,
922 .from_sk = sctp_v4_from_sk,
923 .to_sk_saddr = sctp_v4_to_sk_saddr,
924 .to_sk_daddr = sctp_v4_to_sk_daddr,
925 .from_addr_param = sctp_v4_from_addr_param,
926 .to_addr_param = sctp_v4_to_addr_param,
927 .dst_saddr = sctp_v4_dst_saddr,
928 .cmp_addr = sctp_v4_cmp_addr,
929 .addr_valid = sctp_v4_addr_valid,
930 .inaddr_any = sctp_v4_inaddr_any,
931 .is_any = sctp_v4_is_any,
932 .available = sctp_v4_available,
933 .scope = sctp_v4_scope,
934 .skb_iif = sctp_v4_skb_iif,
935 .is_ce = sctp_v4_is_ce,
936 .seq_dump_addr = sctp_v4_seq_dump_addr,
937 .net_header_len = sizeof(struct iphdr),
938 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800939#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800940 .compat_setsockopt = compat_ip_setsockopt,
941 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800942#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943};
944
945struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
946
947 switch (family) {
948 case PF_INET:
949 return sctp_pf_inet_specific;
950 case PF_INET6:
951 return sctp_pf_inet6_specific;
952 default:
953 return NULL;
954 }
955}
956
957/* Register the PF specific function table. */
958int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
959{
960 switch (family) {
961 case PF_INET:
962 if (sctp_pf_inet_specific)
963 return 0;
964 sctp_pf_inet_specific = pf;
965 break;
966 case PF_INET6:
967 if (sctp_pf_inet6_specific)
968 return 0;
969 sctp_pf_inet6_specific = pf;
970 break;
971 default:
972 return 0;
973 }
974 return 1;
975}
976
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -0700977static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978{
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -0700979 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980}
981
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -0700982static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983{
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -0700984 snmp_mib_free((void**)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985}
986
Vlad Yasevich270637a2008-03-20 15:17:14 -0700987static void sctp_v4_pf_init(void)
988{
989 /* Initialize the SCTP specific PF functions. */
990 sctp_register_pf(&sctp_pf_inet, PF_INET);
991 sctp_register_af(&sctp_af_inet);
992}
993
994static void sctp_v4_pf_exit(void)
995{
996 list_del(&sctp_af_inet.list);
997}
998
999static int sctp_v4_protosw_init(void)
1000{
1001 int rc;
1002
1003 rc = proto_register(&sctp_prot, 1);
1004 if (rc)
1005 return rc;
1006
1007 /* Register SCTP(UDP and TCP style) with socket layer. */
1008 inet_register_protosw(&sctp_seqpacket_protosw);
1009 inet_register_protosw(&sctp_stream_protosw);
1010
1011 return 0;
1012}
1013
1014static void sctp_v4_protosw_exit(void)
1015{
1016 inet_unregister_protosw(&sctp_stream_protosw);
1017 inet_unregister_protosw(&sctp_seqpacket_protosw);
1018 proto_unregister(&sctp_prot);
1019}
1020
1021static int sctp_v4_add_protocol(void)
1022{
1023 /* Register notifier for inet address additions/deletions. */
1024 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1025
1026 /* Register SCTP with inet layer. */
1027 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1028 return -EAGAIN;
1029
1030 return 0;
1031}
1032
1033static void sctp_v4_del_protocol(void)
1034{
1035 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1036 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1037}
1038
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039/* Initialize the universe into something sensible. */
1040SCTP_STATIC __init int sctp_init(void)
1041{
1042 int i;
1043 int status = -EINVAL;
1044 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001045 unsigned long limit;
1046 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 int order;
1048
1049 /* SCTP_DEBUG sanity check. */
1050 if (!sctp_sanity_check())
1051 goto out;
1052
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001053 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 status = -ENOBUFS;
1055 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1056 sizeof(struct sctp_bind_bucket),
1057 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001058 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001060 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1063 sizeof(struct sctp_chunk),
1064 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001065 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 if (!sctp_chunk_cachep)
1067 goto err_chunk_cachep;
1068
1069 /* Allocate and initialise sctp mibs. */
1070 status = init_sctp_mibs();
1071 if (status)
1072 goto err_init_mibs;
1073
1074 /* Initialize proc fs directory. */
1075 status = sctp_proc_init();
1076 if (status)
1077 goto err_init_proc;
1078
1079 /* Initialize object count debugging. */
1080 sctp_dbg_objcnt_init();
1081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 /*
1083 * 14. Suggested SCTP Protocol Parameter Values
1084 */
1085 /* The following protocol parameters are RECOMMENDED: */
1086 /* RTO.Initial - 3 seconds */
1087 sctp_rto_initial = SCTP_RTO_INITIAL;
1088 /* RTO.Min - 1 second */
1089 sctp_rto_min = SCTP_RTO_MIN;
1090 /* RTO.Max - 60 seconds */
1091 sctp_rto_max = SCTP_RTO_MAX;
1092 /* RTO.Alpha - 1/8 */
1093 sctp_rto_alpha = SCTP_RTO_ALPHA;
1094 /* RTO.Beta - 1/4 */
1095 sctp_rto_beta = SCTP_RTO_BETA;
1096
1097 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001098 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100 /* Whether Cookie Preservative is enabled(1) or not(0) */
1101 sctp_cookie_preserve_enable = 1;
1102
1103 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001104 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
1106 /* Association.Max.Retrans - 10 attempts
1107 * Path.Max.Retrans - 5 attempts (per destination address)
1108 * Max.Init.Retransmits - 8 attempts
1109 */
1110 sctp_max_retrans_association = 10;
1111 sctp_max_retrans_path = 5;
1112 sctp_max_retrans_init = 8;
1113
Neil Horman4eb701d2005-04-28 12:02:04 -07001114 /* Sendbuffer growth - do per-socket accounting */
1115 sctp_sndbuf_policy = 0;
1116
Neil Horman049b3ff2005-11-11 16:08:24 -08001117 /* Rcvbuffer growth - do per-socket accounting */
1118 sctp_rcvbuf_policy = 0;
1119
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001121 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1122
1123 /* delayed SACK timeout */
1124 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126 /* Implementation specific variables. */
1127
1128 /* Initialize default stream count setup information. */
1129 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1130 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1131
1132 /* Initialize handle used for association ids. */
1133 idr_init(&sctp_assocs_id);
1134
Neil Horman4d93df02007-08-15 16:07:44 -07001135 /* Set the pressure threshold to be a fraction of global memory that
1136 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1137 * memory, with a floor of 128 pages.
1138 * Note this initalizes the data in sctpv6_prot too
1139 * Unabashedly stolen from tcp_init
1140 */
1141 limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1142 limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1143 limit = max(limit, 128UL);
1144 sysctl_sctp_mem[0] = limit / 4 * 3;
1145 sysctl_sctp_mem[1] = limit;
1146 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1147
1148 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1149 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1150 max_share = min(4UL*1024*1024, limit);
1151
1152 sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */
1153 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1154 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1155
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001156 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001157 sysctl_sctp_wmem[1] = 16*1024;
1158 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1159
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 /* Size and allocate the association hash table.
1161 * The methodology is similar to that of the tcp hash tables.
1162 */
1163 if (num_physpages >= (128 * 1024))
1164 goal = num_physpages >> (22 - PAGE_SHIFT);
1165 else
1166 goal = num_physpages >> (24 - PAGE_SHIFT);
1167
1168 for (order = 0; (1UL << order) < goal; order++)
1169 ;
1170
1171 do {
1172 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1173 sizeof(struct sctp_hashbucket);
1174 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1175 continue;
1176 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1177 __get_free_pages(GFP_ATOMIC, order);
1178 } while (!sctp_assoc_hashtable && --order > 0);
1179 if (!sctp_assoc_hashtable) {
1180 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1181 status = -ENOMEM;
1182 goto err_ahash_alloc;
1183 }
1184 for (i = 0; i < sctp_assoc_hashsize; i++) {
1185 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001186 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 }
1188
1189 /* Allocate and initialize the endpoint hash table. */
1190 sctp_ep_hashsize = 64;
1191 sctp_ep_hashtable = (struct sctp_hashbucket *)
1192 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1193 if (!sctp_ep_hashtable) {
1194 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1195 status = -ENOMEM;
1196 goto err_ehash_alloc;
1197 }
1198 for (i = 0; i < sctp_ep_hashsize; i++) {
1199 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001200 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 }
1202
1203 /* Allocate and initialize the SCTP port hash table. */
1204 do {
1205 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1206 sizeof(struct sctp_bind_hashbucket);
1207 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1208 continue;
1209 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1210 __get_free_pages(GFP_ATOMIC, order);
1211 } while (!sctp_port_hashtable && --order > 0);
1212 if (!sctp_port_hashtable) {
1213 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1214 status = -ENOMEM;
1215 goto err_bhash_alloc;
1216 }
1217 for (i = 0; i < sctp_port_hashsize; i++) {
1218 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001219 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 }
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 printk(KERN_INFO "SCTP: Hash tables configured "
1223 "(established %d bind %d)\n",
1224 sctp_assoc_hashsize, sctp_port_hashsize);
1225
1226 /* Disable ADDIP by default. */
1227 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001228 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230 /* Enable PR-SCTP by default. */
1231 sctp_prsctp_enable = 1;
1232
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001233 /* Disable AUTH by default. */
1234 sctp_auth_enable = 0;
1235
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 sctp_sysctl_register();
1237
1238 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001239 sctp_v4_pf_init();
1240 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Vlad Yasevich270637a2008-03-20 15:17:14 -07001242 /* Initialize the local address list. */
1243 INIT_LIST_HEAD(&sctp_local_addr_list);
1244 spin_lock_init(&sctp_local_addr_lock);
1245 sctp_get_local_addr_list();
1246
1247 status = sctp_v4_protosw_init();
1248
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001249 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001250 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001251
Vlad Yasevich270637a2008-03-20 15:17:14 -07001252 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001254 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256 /* Initialize the control inode/socket for handling OOTB packets. */
1257 if ((status = sctp_ctl_sock_init())) {
1258 printk (KERN_ERR
1259 "SCTP: Failed to initialize the SCTP control sock.\n");
1260 goto err_ctl_sock_init;
1261 }
1262
Vlad Yasevich270637a2008-03-20 15:17:14 -07001263 status = sctp_v4_add_protocol();
1264 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001265 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001266
1267 /* Register SCTP with inet6 layer. */
1268 status = sctp_v6_add_protocol();
1269 if (status)
1270 goto err_v6_add_protocol;
1271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 status = 0;
1273out:
1274 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001275err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001276 sctp_v6_del_protocol();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001277err_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001278 sctp_v4_del_protocol();
Denis V. Lunev56772422008-04-03 14:28:30 -07001279 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280err_ctl_sock_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001281 sctp_v6_protosw_exit();
1282err_v6_protosw_init:
1283 sctp_v4_protosw_exit();
1284err_protosw_init:
1285 sctp_free_local_addr_list();
1286 sctp_v4_pf_exit();
1287 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 sctp_sysctl_unregister();
Neil Horman15efbe72008-02-15 09:53:59 -05001289 list_del(&sctp_af_inet.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 free_pages((unsigned long)sctp_port_hashtable,
1291 get_order(sctp_port_hashsize *
1292 sizeof(struct sctp_bind_hashbucket)));
1293err_bhash_alloc:
1294 kfree(sctp_ep_hashtable);
1295err_ehash_alloc:
1296 free_pages((unsigned long)sctp_assoc_hashtable,
1297 get_order(sctp_assoc_hashsize *
1298 sizeof(struct sctp_hashbucket)));
1299err_ahash_alloc:
1300 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001302err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 cleanup_sctp_mibs();
1304err_init_mibs:
1305 kmem_cache_destroy(sctp_chunk_cachep);
1306err_chunk_cachep:
1307 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 goto out;
1309}
1310
1311/* Exit handler for the SCTP protocol. */
1312SCTP_STATIC __exit void sctp_exit(void)
1313{
1314 /* BUG. This should probably do something useful like clean
1315 * up all the remaining associations and all that memory.
1316 */
1317
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001318 /* Unregister with inet6/inet layers. */
1319 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001320 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 /* Free the control endpoint. */
Denis V. Lunev56772422008-04-03 14:28:30 -07001323 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
Vlad Yasevich270637a2008-03-20 15:17:14 -07001325 /* Free protosw registrations */
1326 sctp_v6_protosw_exit();
1327 sctp_v4_protosw_exit();
1328
1329 /* Free the local address list. */
1330 sctp_free_local_addr_list();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001331
1332 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001333 sctp_v6_pf_exit();
1334 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001335
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 sctp_sysctl_unregister();
Neil Horman15efbe72008-02-15 09:53:59 -05001337 list_del(&sctp_af_inet.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339 free_pages((unsigned long)sctp_assoc_hashtable,
1340 get_order(sctp_assoc_hashsize *
1341 sizeof(struct sctp_hashbucket)));
1342 kfree(sctp_ep_hashtable);
1343 free_pages((unsigned long)sctp_port_hashtable,
1344 get_order(sctp_port_hashsize *
1345 sizeof(struct sctp_bind_hashbucket)));
1346
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 sctp_dbg_objcnt_exit();
1348 sctp_proc_exit();
1349 cleanup_sctp_mibs();
1350
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001351 kmem_cache_destroy(sctp_chunk_cachep);
1352 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353}
1354
1355module_init(sctp_init);
1356module_exit(sctp_exit);
1357
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001358/*
1359 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1360 */
1361MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001362MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1364MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1365MODULE_LICENSE("GPL");