blob: d50f610d1b02a4b44ffde9dee0d651f5d01fa49e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* SCTP kernel reference Implementation
2 * (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 *
9 * This file is part of the SCTP kernel reference Implementation
10 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
13 * The SCTP reference implementation is free software;
14 * 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 *
19 * The SCTP reference implementation is distributed in the hope that it
20 * 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 */
77static struct socket *sctp_ctl_socket;
78
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{
94 return sctp_ctl_socket->sk;
95}
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)))) {
Al Viro5ab7b852006-11-20 17:10:38 -0800232 error = sctp_add_bind_addr(bp, &addr->a, 1,
Vlad Yasevich559cf712007-09-16 16:03:28 -0700233 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;
340 addr->v4.sin_addr.s_addr = INADDR_ANY;
341 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{
347 return INADDR_ANY == addr->v4.sin_addr.s_addr;
348}
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? */
362 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
363 return 0;
364
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900365 /* Is this a broadcast address? */
366 if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
367 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{
375 int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Neil Hormancdac4e02005-06-13 15:12:33 -0700378 if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
379 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. */
411 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
412 retval = SCTP_SCOPE_UNUSABLE;
413 } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
414 retval = SCTP_SCOPE_LOOPBACK;
415 } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
416 retval = SCTP_SCOPE_LINK;
417 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
418 retval = SCTP_SCOPE_PRIVATE;
419 } else {
420 retval = SCTP_SCOPE_GLOBAL;
421 }
422
423 return retval;
424}
425
426/* Returns a valid dst cache entry for the given source and destination ip
427 * addresses. If an association is passed, trys to get a dst entry with a
428 * source address that matches an address in the bind address list.
429 */
430static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
431 union sctp_addr *daddr,
432 union sctp_addr *saddr)
433{
434 struct rtable *rt;
435 struct flowi fl;
436 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 struct dst_entry *dst = NULL;
439 union sctp_addr dst_saddr;
440
441 memset(&fl, 0x0, sizeof(struct flowi));
442 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
443 fl.proto = IPPROTO_SCTP;
444 if (asoc) {
445 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
446 fl.oif = asoc->base.sk->sk_bound_dev_if;
447 }
448 if (saddr)
449 fl.fl4_src = saddr->v4.sin_addr.s_addr;
450
451 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
452 __FUNCTION__, NIPQUAD(fl.fl4_dst),
453 NIPQUAD(fl.fl4_src));
454
455 if (!ip_route_output_key(&rt, &fl)) {
456 dst = &rt->u.dst;
457 }
458
459 /* If there is no association or if a source address is passed, no
460 * more validation is required.
461 */
462 if (!asoc || saddr)
463 goto out;
464
465 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 if (dst) {
468 /* Walk through the bind address list and look for a bind
469 * address that matches the source address of the returned dst.
470 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700471 rcu_read_lock();
472 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
473 if (!laddr->valid || !laddr->use_as_src)
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700474 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800475 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
476 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 goto out_unlock;
478 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700479 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 /* None of the bound addresses match the source address of the
482 * dst. So release it.
483 */
484 dst_release(dst);
485 dst = NULL;
486 }
487
488 /* Walk through the bind address list and try to get a dst that
489 * matches a bind address as the source address.
490 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700491 rcu_read_lock();
492 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
493 if (!laddr->valid)
494 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700495 if ((laddr->use_as_src) &&
Al Viro6244be42006-11-20 17:21:44 -0800496 (AF_INET == laddr->a.sa.sa_family)) {
497 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (!ip_route_output_key(&rt, &fl)) {
499 dst = &rt->u.dst;
500 goto out_unlock;
501 }
502 }
503 }
504
505out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700506 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507out:
508 if (dst)
509 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900510 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 else
512 SCTP_DEBUG_PRINTK("NO ROUTE\n");
513
514 return dst;
515}
516
517/* For v4, the source address is cached in the route entry(dst). So no need
518 * to cache it separately and hence this is an empty routine.
519 */
520static void sctp_v4_get_saddr(struct sctp_association *asoc,
521 struct dst_entry *dst,
522 union sctp_addr *daddr,
523 union sctp_addr *saddr)
524{
525 struct rtable *rt = (struct rtable *)dst;
526
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800527 if (!asoc)
528 return;
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (rt) {
531 saddr->v4.sin_family = AF_INET;
Al Virod3f7a542006-11-20 17:12:41 -0800532 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900533 saddr->v4.sin_addr.s_addr = rt->rt_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
535}
536
537/* What interface did this skb arrive on? */
538static int sctp_v4_skb_iif(const struct sk_buff *skb)
539{
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900540 return ((struct rtable *)skb->dst)->rt_iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
543/* Was this packet marked by Explicit Congestion Notification? */
544static int sctp_v4_is_ce(const struct sk_buff *skb)
545{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700546 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548
549/* Create and initialize a new sk for the socket returned by accept(). */
550static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
551 struct sctp_association *asoc)
552{
553 struct inet_sock *inet = inet_sk(sk);
554 struct inet_sock *newinet;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700555 struct sock *newsk = sk_alloc(sk->sk_net, PF_INET, GFP_KERNEL,
556 sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 if (!newsk)
559 goto out;
560
561 sock_init_data(NULL, newsk);
562
563 newsk->sk_type = SOCK_STREAM;
564
565 newsk->sk_no_check = sk->sk_no_check;
566 newsk->sk_reuse = sk->sk_reuse;
567 newsk->sk_shutdown = sk->sk_shutdown;
568
569 newsk->sk_destruct = inet_sock_destruct;
570 newsk->sk_family = PF_INET;
571 newsk->sk_protocol = IPPROTO_SCTP;
572 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
573 sock_reset_flag(newsk, SOCK_ZAPPED);
574
575 newinet = inet_sk(newsk);
576
577 /* Initialize sk's sport, dport, rcv_saddr and daddr for
578 * getsockname() and getpeername()
579 */
580 newinet->sport = inet->sport;
581 newinet->saddr = inet->saddr;
582 newinet->rcv_saddr = inet->rcv_saddr;
583 newinet->dport = htons(asoc->peer.port);
584 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
585 newinet->pmtudisc = inet->pmtudisc;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900586 newinet->id = asoc->next_tsn ^ jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 newinet->uc_ttl = -1;
589 newinet->mc_loop = 1;
590 newinet->mc_ttl = 1;
591 newinet->mc_index = 0;
592 newinet->mc_list = NULL;
593
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700594 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
596 if (newsk->sk_prot->init(newsk)) {
597 sk_common_release(newsk);
598 newsk = NULL;
599 }
600
601out:
602 return newsk;
603}
604
605/* Map address, empty for v4 family */
606static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
607{
608 /* Empty */
609}
610
611/* Dump the v4 addr to the seq file. */
612static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
613{
614 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
615}
616
Vlad Yasevich29303542007-09-16 16:02:12 -0700617/* Event handler for inet address addition/deletion events.
618 * The sctp_local_addr_list needs to be protocted by a spin lock since
619 * multiple notifiers (say IPv4 and IPv6) may be running at the same
620 * time and thus corrupt the list.
621 * The reader side is protected with RCU.
622 */
Adrian Bunk24123182006-12-20 16:08:22 -0800623static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
624 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800626 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700627 struct sctp_sockaddr_entry *addr = NULL;
628 struct sctp_sockaddr_entry *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800630 switch (ev) {
631 case NETDEV_UP:
632 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
633 if (addr) {
634 addr->a.v4.sin_family = AF_INET;
635 addr->a.v4.sin_port = 0;
636 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700637 addr->valid = 1;
638 spin_lock_bh(&sctp_local_addr_lock);
639 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
640 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800641 }
642 break;
643 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700644 spin_lock_bh(&sctp_local_addr_lock);
645 list_for_each_entry_safe(addr, temp,
646 &sctp_local_addr_list, list) {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800647 if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
Vlad Yasevich29303542007-09-16 16:02:12 -0700648 addr->valid = 0;
649 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800650 break;
651 }
652 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700653 spin_unlock_bh(&sctp_local_addr_lock);
654 if (addr && !addr->valid)
655 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800656 break;
657 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 return NOTIFY_DONE;
660}
661
662/*
663 * Initialize the control inode/socket with a control endpoint data
664 * structure. This endpoint is reserved exclusively for the OOTB processing.
665 */
666static int sctp_ctl_sock_init(void)
667{
668 int err;
669 sa_family_t family;
670
671 if (sctp_get_pf_specific(PF_INET6))
672 family = PF_INET6;
673 else
674 family = PF_INET;
675
676 err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
677 &sctp_ctl_socket);
678 if (err < 0) {
679 printk(KERN_ERR
680 "SCTP: Failed to create the SCTP control socket.\n");
681 return err;
682 }
683 sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
684 inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
685
686 return 0;
687}
688
689/* Register address family specific functions. */
690int sctp_register_af(struct sctp_af *af)
691{
692 switch (af->sa_family) {
693 case AF_INET:
694 if (sctp_af_v4_specific)
695 return 0;
696 sctp_af_v4_specific = af;
697 break;
698 case AF_INET6:
699 if (sctp_af_v6_specific)
700 return 0;
701 sctp_af_v6_specific = af;
702 break;
703 default:
704 return 0;
705 }
706
707 INIT_LIST_HEAD(&af->list);
708 list_add_tail(&af->list, &sctp_address_families);
709 return 1;
710}
711
712/* Get the table of functions for manipulating a particular address
713 * family.
714 */
715struct sctp_af *sctp_get_af_specific(sa_family_t family)
716{
717 switch (family) {
718 case AF_INET:
719 return sctp_af_v4_specific;
720 case AF_INET6:
721 return sctp_af_v6_specific;
722 default:
723 return NULL;
724 }
725}
726
727/* Common code to initialize a AF_INET msg_name. */
728static void sctp_inet_msgname(char *msgname, int *addr_len)
729{
730 struct sockaddr_in *sin;
731
732 sin = (struct sockaddr_in *)msgname;
733 *addr_len = sizeof(struct sockaddr_in);
734 sin->sin_family = AF_INET;
735 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
736}
737
738/* Copy the primary address of the peer primary address as the msg_name. */
739static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
740 int *addr_len)
741{
742 struct sockaddr_in *sin, *sinfrom;
743
744 if (msgname) {
745 struct sctp_association *asoc;
746
747 asoc = event->asoc;
748 sctp_inet_msgname(msgname, addr_len);
749 sin = (struct sockaddr_in *)msgname;
750 sinfrom = &asoc->peer.primary_addr.v4;
751 sin->sin_port = htons(asoc->peer.port);
752 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
753 }
754}
755
756/* Initialize and copy out a msgname from an inbound skb. */
757static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
758{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300760 struct sctphdr *sh = sctp_hdr(skb);
761 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700765 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
767}
768
769/* Do we support this AF? */
770static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
771{
772 /* PF_INET only supports AF_INET addresses. */
773 return (AF_INET == family);
774}
775
776/* Address matching with wildcards allowed. */
777static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
778 const union sctp_addr *addr2,
779 struct sctp_sock *opt)
780{
781 /* PF_INET only supports AF_INET addresses. */
782 if (addr1->sa.sa_family != addr2->sa.sa_family)
783 return 0;
784 if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
785 INADDR_ANY == addr2->v4.sin_addr.s_addr)
786 return 1;
787 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
788 return 1;
789
790 return 0;
791}
792
793/* Verify that provided sockaddr looks bindable. Common verification has
794 * already been taken care of.
795 */
796static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
797{
798 return sctp_v4_available(addr, opt);
799}
800
801/* Verify that sockaddr looks sendable. Common verification has already
802 * been taken care of.
803 */
804static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
805{
806 return 1;
807}
808
809/* Fill in Supported Address Type information for INIT and INIT-ACK
810 * chunks. Returns number of addresses supported.
811 */
812static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800813 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
815 types[0] = SCTP_PARAM_IPV4_ADDRESS;
816 return 1;
817}
818
819/* Wrapper routine that calls the ip transmit routine. */
820static inline int sctp_v4_xmit(struct sk_buff *skb,
821 struct sctp_transport *transport, int ipfragok)
822{
823 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
824 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
825 __FUNCTION__, skb, skb->len,
826 NIPQUAD(((struct rtable *)skb->dst)->rt_src),
827 NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
828
829 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
David S. Millere89862f2007-01-26 01:04:55 -0800830 return ip_queue_xmit(skb, ipfragok);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831}
832
833static struct sctp_af sctp_ipv4_specific;
834
835static struct sctp_pf sctp_pf_inet = {
836 .event_msgname = sctp_inet_event_msgname,
837 .skb_msgname = sctp_inet_skb_msgname,
838 .af_supported = sctp_inet_af_supported,
839 .cmp_addr = sctp_inet_cmp_addr,
840 .bind_verify = sctp_inet_bind_verify,
841 .send_verify = sctp_inet_send_verify,
842 .supported_addrs = sctp_inet_supported_addrs,
843 .create_accept_sk = sctp_v4_create_accept_sk,
844 .addr_v4map = sctp_v4_addr_v4map,
845 .af = &sctp_ipv4_specific,
846};
847
848/* Notifier for inetaddr addition/deletion events. */
849static struct notifier_block sctp_inetaddr_notifier = {
850 .notifier_call = sctp_inetaddr_event,
851};
852
853/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800854static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800855 .family = PF_INET,
856 .owner = THIS_MODULE,
857 .release = inet_release, /* Needs to be wrapped... */
858 .bind = inet_bind,
859 .connect = inet_dgram_connect,
860 .socketpair = sock_no_socketpair,
861 .accept = inet_accept,
862 .getname = inet_getname, /* Semantics are different. */
863 .poll = sctp_poll,
864 .ioctl = inet_ioctl,
865 .listen = sctp_inet_listen,
866 .shutdown = inet_shutdown, /* Looks harmless. */
867 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
868 .getsockopt = sock_common_getsockopt,
869 .sendmsg = inet_sendmsg,
870 .recvmsg = sock_common_recvmsg,
871 .mmap = sock_no_mmap,
872 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800873#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800874 .compat_setsockopt = compat_sock_common_setsockopt,
875 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800876#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877};
878
879/* Registration with AF_INET family. */
880static struct inet_protosw sctp_seqpacket_protosw = {
881 .type = SOCK_SEQPACKET,
882 .protocol = IPPROTO_SCTP,
883 .prot = &sctp_prot,
884 .ops = &inet_seqpacket_ops,
885 .capability = -1,
886 .no_check = 0,
887 .flags = SCTP_PROTOSW_FLAG
888};
889static struct inet_protosw sctp_stream_protosw = {
890 .type = SOCK_STREAM,
891 .protocol = IPPROTO_SCTP,
892 .prot = &sctp_prot,
893 .ops = &inet_seqpacket_ops,
894 .capability = -1,
895 .no_check = 0,
896 .flags = SCTP_PROTOSW_FLAG
897};
898
899/* Register with IP layer. */
900static struct net_protocol sctp_protocol = {
901 .handler = sctp_rcv,
902 .err_handler = sctp_v4_err,
903 .no_policy = 1,
904};
905
906/* IPv4 address related functions. */
907static struct sctp_af sctp_ipv4_specific = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800908 .sa_family = AF_INET,
909 .sctp_xmit = sctp_v4_xmit,
910 .setsockopt = ip_setsockopt,
911 .getsockopt = ip_getsockopt,
912 .get_dst = sctp_v4_get_dst,
913 .get_saddr = sctp_v4_get_saddr,
914 .copy_addrlist = sctp_v4_copy_addrlist,
915 .from_skb = sctp_v4_from_skb,
916 .from_sk = sctp_v4_from_sk,
917 .to_sk_saddr = sctp_v4_to_sk_saddr,
918 .to_sk_daddr = sctp_v4_to_sk_daddr,
919 .from_addr_param = sctp_v4_from_addr_param,
920 .to_addr_param = sctp_v4_to_addr_param,
921 .dst_saddr = sctp_v4_dst_saddr,
922 .cmp_addr = sctp_v4_cmp_addr,
923 .addr_valid = sctp_v4_addr_valid,
924 .inaddr_any = sctp_v4_inaddr_any,
925 .is_any = sctp_v4_is_any,
926 .available = sctp_v4_available,
927 .scope = sctp_v4_scope,
928 .skb_iif = sctp_v4_skb_iif,
929 .is_ce = sctp_v4_is_ce,
930 .seq_dump_addr = sctp_v4_seq_dump_addr,
931 .net_header_len = sizeof(struct iphdr),
932 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800933#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800934 .compat_setsockopt = compat_ip_setsockopt,
935 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800936#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937};
938
939struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
940
941 switch (family) {
942 case PF_INET:
943 return sctp_pf_inet_specific;
944 case PF_INET6:
945 return sctp_pf_inet6_specific;
946 default:
947 return NULL;
948 }
949}
950
951/* Register the PF specific function table. */
952int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
953{
954 switch (family) {
955 case PF_INET:
956 if (sctp_pf_inet_specific)
957 return 0;
958 sctp_pf_inet_specific = pf;
959 break;
960 case PF_INET6:
961 if (sctp_pf_inet6_specific)
962 return 0;
963 sctp_pf_inet6_specific = pf;
964 break;
965 default:
966 return 0;
967 }
968 return 1;
969}
970
971static int __init init_sctp_mibs(void)
972{
973 sctp_statistics[0] = alloc_percpu(struct sctp_mib);
974 if (!sctp_statistics[0])
975 return -ENOMEM;
976 sctp_statistics[1] = alloc_percpu(struct sctp_mib);
977 if (!sctp_statistics[1]) {
978 free_percpu(sctp_statistics[0]);
979 return -ENOMEM;
980 }
981 return 0;
982
983}
984
985static void cleanup_sctp_mibs(void)
986{
987 free_percpu(sctp_statistics[0]);
988 free_percpu(sctp_statistics[1]);
989}
990
991/* Initialize the universe into something sensible. */
992SCTP_STATIC __init int sctp_init(void)
993{
994 int i;
995 int status = -EINVAL;
996 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -0700997 unsigned long limit;
998 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 int order;
1000
1001 /* SCTP_DEBUG sanity check. */
1002 if (!sctp_sanity_check())
1003 goto out;
1004
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001005 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 status = -ENOBUFS;
1007 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1008 sizeof(struct sctp_bind_bucket),
1009 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001010 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001012 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
1014 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1015 sizeof(struct sctp_chunk),
1016 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001017 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 if (!sctp_chunk_cachep)
1019 goto err_chunk_cachep;
1020
1021 /* Allocate and initialise sctp mibs. */
1022 status = init_sctp_mibs();
1023 if (status)
1024 goto err_init_mibs;
1025
1026 /* Initialize proc fs directory. */
1027 status = sctp_proc_init();
1028 if (status)
1029 goto err_init_proc;
1030
1031 /* Initialize object count debugging. */
1032 sctp_dbg_objcnt_init();
1033
1034 /* Initialize the SCTP specific PF functions. */
1035 sctp_register_pf(&sctp_pf_inet, PF_INET);
1036 /*
1037 * 14. Suggested SCTP Protocol Parameter Values
1038 */
1039 /* The following protocol parameters are RECOMMENDED: */
1040 /* RTO.Initial - 3 seconds */
1041 sctp_rto_initial = SCTP_RTO_INITIAL;
1042 /* RTO.Min - 1 second */
1043 sctp_rto_min = SCTP_RTO_MIN;
1044 /* RTO.Max - 60 seconds */
1045 sctp_rto_max = SCTP_RTO_MAX;
1046 /* RTO.Alpha - 1/8 */
1047 sctp_rto_alpha = SCTP_RTO_ALPHA;
1048 /* RTO.Beta - 1/4 */
1049 sctp_rto_beta = SCTP_RTO_BETA;
1050
1051 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001052 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
1054 /* Whether Cookie Preservative is enabled(1) or not(0) */
1055 sctp_cookie_preserve_enable = 1;
1056
1057 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001058 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
1060 /* Association.Max.Retrans - 10 attempts
1061 * Path.Max.Retrans - 5 attempts (per destination address)
1062 * Max.Init.Retransmits - 8 attempts
1063 */
1064 sctp_max_retrans_association = 10;
1065 sctp_max_retrans_path = 5;
1066 sctp_max_retrans_init = 8;
1067
Neil Horman4eb701d2005-04-28 12:02:04 -07001068 /* Sendbuffer growth - do per-socket accounting */
1069 sctp_sndbuf_policy = 0;
1070
Neil Horman049b3ff2005-11-11 16:08:24 -08001071 /* Rcvbuffer growth - do per-socket accounting */
1072 sctp_rcvbuf_policy = 0;
1073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001075 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1076
1077 /* delayed SACK timeout */
1078 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
1080 /* Implementation specific variables. */
1081
1082 /* Initialize default stream count setup information. */
1083 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1084 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1085
1086 /* Initialize handle used for association ids. */
1087 idr_init(&sctp_assocs_id);
1088
Neil Horman4d93df02007-08-15 16:07:44 -07001089 /* Set the pressure threshold to be a fraction of global memory that
1090 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1091 * memory, with a floor of 128 pages.
1092 * Note this initalizes the data in sctpv6_prot too
1093 * Unabashedly stolen from tcp_init
1094 */
1095 limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1096 limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1097 limit = max(limit, 128UL);
1098 sysctl_sctp_mem[0] = limit / 4 * 3;
1099 sysctl_sctp_mem[1] = limit;
1100 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1101
1102 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1103 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1104 max_share = min(4UL*1024*1024, limit);
1105
1106 sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */
1107 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1108 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1109
1110 sysctl_sctp_wmem[0] = SK_STREAM_MEM_QUANTUM;
1111 sysctl_sctp_wmem[1] = 16*1024;
1112 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 /* Size and allocate the association hash table.
1115 * The methodology is similar to that of the tcp hash tables.
1116 */
1117 if (num_physpages >= (128 * 1024))
1118 goal = num_physpages >> (22 - PAGE_SHIFT);
1119 else
1120 goal = num_physpages >> (24 - PAGE_SHIFT);
1121
1122 for (order = 0; (1UL << order) < goal; order++)
1123 ;
1124
1125 do {
1126 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1127 sizeof(struct sctp_hashbucket);
1128 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1129 continue;
1130 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1131 __get_free_pages(GFP_ATOMIC, order);
1132 } while (!sctp_assoc_hashtable && --order > 0);
1133 if (!sctp_assoc_hashtable) {
1134 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1135 status = -ENOMEM;
1136 goto err_ahash_alloc;
1137 }
1138 for (i = 0; i < sctp_assoc_hashsize; i++) {
1139 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001140 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 }
1142
1143 /* Allocate and initialize the endpoint hash table. */
1144 sctp_ep_hashsize = 64;
1145 sctp_ep_hashtable = (struct sctp_hashbucket *)
1146 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1147 if (!sctp_ep_hashtable) {
1148 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1149 status = -ENOMEM;
1150 goto err_ehash_alloc;
1151 }
1152 for (i = 0; i < sctp_ep_hashsize; i++) {
1153 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001154 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 }
1156
1157 /* Allocate and initialize the SCTP port hash table. */
1158 do {
1159 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1160 sizeof(struct sctp_bind_hashbucket);
1161 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1162 continue;
1163 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1164 __get_free_pages(GFP_ATOMIC, order);
1165 } while (!sctp_port_hashtable && --order > 0);
1166 if (!sctp_port_hashtable) {
1167 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1168 status = -ENOMEM;
1169 goto err_bhash_alloc;
1170 }
1171 for (i = 0; i < sctp_port_hashsize; i++) {
1172 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001173 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 }
1175
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 printk(KERN_INFO "SCTP: Hash tables configured "
1177 "(established %d bind %d)\n",
1178 sctp_assoc_hashsize, sctp_port_hashsize);
1179
1180 /* Disable ADDIP by default. */
1181 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001182 sctp_addip_noauth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 /* Enable PR-SCTP by default. */
1185 sctp_prsctp_enable = 1;
1186
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001187 /* Disable AUTH by default. */
1188 sctp_auth_enable = 0;
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 sctp_sysctl_register();
1191
1192 INIT_LIST_HEAD(&sctp_address_families);
1193 sctp_register_af(&sctp_ipv4_specific);
1194
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001195 status = proto_register(&sctp_prot, 1);
1196 if (status)
1197 goto err_proto_register;
1198
1199 /* Register SCTP(UDP and TCP style) with socket layer. */
1200 inet_register_protosw(&sctp_seqpacket_protosw);
1201 inet_register_protosw(&sctp_stream_protosw);
1202
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 status = sctp_v6_init();
1204 if (status)
1205 goto err_v6_init;
1206
1207 /* Initialize the control inode/socket for handling OOTB packets. */
1208 if ((status = sctp_ctl_sock_init())) {
1209 printk (KERN_ERR
1210 "SCTP: Failed to initialize the SCTP control sock.\n");
1211 goto err_ctl_sock_init;
1212 }
1213
1214 /* Initialize the local address list. */
1215 INIT_LIST_HEAD(&sctp_local_addr_list);
Vlad Yasevich29303542007-09-16 16:02:12 -07001216 spin_lock_init(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08001217 sctp_get_local_addr_list();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
1219 /* Register notifier for inet address additions/deletions. */
1220 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1221
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001222 /* Register SCTP with inet layer. */
1223 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) {
1224 status = -EAGAIN;
1225 goto err_add_protocol;
1226 }
1227
1228 /* Register SCTP with inet6 layer. */
1229 status = sctp_v6_add_protocol();
1230 if (status)
1231 goto err_v6_add_protocol;
1232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 status = 0;
1234out:
1235 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001236err_v6_add_protocol:
1237 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1238 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1239err_add_protocol:
1240 sctp_free_local_addr_list();
1241 sock_release(sctp_ctl_socket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242err_ctl_sock_init:
1243 sctp_v6_exit();
1244err_v6_init:
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001245 inet_unregister_protosw(&sctp_stream_protosw);
1246 inet_unregister_protosw(&sctp_seqpacket_protosw);
1247 proto_unregister(&sctp_prot);
1248err_proto_register:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 sctp_sysctl_unregister();
1250 list_del(&sctp_ipv4_specific.list);
1251 free_pages((unsigned long)sctp_port_hashtable,
1252 get_order(sctp_port_hashsize *
1253 sizeof(struct sctp_bind_hashbucket)));
1254err_bhash_alloc:
1255 kfree(sctp_ep_hashtable);
1256err_ehash_alloc:
1257 free_pages((unsigned long)sctp_assoc_hashtable,
1258 get_order(sctp_assoc_hashsize *
1259 sizeof(struct sctp_hashbucket)));
1260err_ahash_alloc:
1261 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001263err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 cleanup_sctp_mibs();
1265err_init_mibs:
1266 kmem_cache_destroy(sctp_chunk_cachep);
1267err_chunk_cachep:
1268 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 goto out;
1270}
1271
1272/* Exit handler for the SCTP protocol. */
1273SCTP_STATIC __exit void sctp_exit(void)
1274{
1275 /* BUG. This should probably do something useful like clean
1276 * up all the remaining associations and all that memory.
1277 */
1278
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001279 /* Unregister with inet6/inet layers. */
1280 sctp_v6_del_protocol();
1281 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
Vlad Yasevich29303542007-09-16 16:02:12 -07001283 /* Unregister notifier for inet address additions/deletions. */
1284 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 /* Free the local address list. */
1287 sctp_free_local_addr_list();
1288
1289 /* Free the control endpoint. */
1290 sock_release(sctp_ctl_socket);
1291
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001292 /* Cleanup v6 initializations. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 sctp_v6_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001294
1295 /* Unregister with socket layer. */
1296 inet_unregister_protosw(&sctp_stream_protosw);
1297 inet_unregister_protosw(&sctp_seqpacket_protosw);
1298
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 sctp_sysctl_unregister();
1300 list_del(&sctp_ipv4_specific.list);
1301
1302 free_pages((unsigned long)sctp_assoc_hashtable,
1303 get_order(sctp_assoc_hashsize *
1304 sizeof(struct sctp_hashbucket)));
1305 kfree(sctp_ep_hashtable);
1306 free_pages((unsigned long)sctp_port_hashtable,
1307 get_order(sctp_port_hashsize *
1308 sizeof(struct sctp_bind_hashbucket)));
1309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 sctp_dbg_objcnt_exit();
1311 sctp_proc_exit();
1312 cleanup_sctp_mibs();
1313
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001314 kmem_cache_destroy(sctp_chunk_cachep);
1315 kmem_cache_destroy(sctp_bucket_cachep);
1316
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 proto_unregister(&sctp_prot);
1318}
1319
1320module_init(sctp_init);
1321module_exit(sctp_exit);
1322
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001323/*
1324 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1325 */
1326MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001327MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1329MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1330MODULE_LICENSE("GPL");