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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 *
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
47 */
48
Joe Perches145ce502010-08-24 13:21:08 +000049#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
Neil Horman4d93df02007-08-15 16:07:44 -070056#include <linux/bootmem.h>
Vlad Yasevich845525a2008-07-18 23:08:21 -070057#include <linux/highmem.h>
58#include <linux/swap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020060#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020064#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070071struct sctp_globals sctp_globals __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73struct idr sctp_assocs_id;
74DEFINE_SPINLOCK(sctp_assocs_id_lock);
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static struct sctp_pf *sctp_pf_inet6_specific;
77static struct sctp_pf *sctp_pf_inet_specific;
78static struct sctp_af *sctp_af_v4_specific;
79static struct sctp_af *sctp_af_v6_specific;
80
Christoph Lametere18b8902006-12-06 20:33:20 -080081struct kmem_cache *sctp_chunk_cachep __read_mostly;
82struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Eric Dumazet8d987e52010-11-09 23:24:26 +000084long sysctl_sctp_mem[3];
Vlad Yasevich007e3932007-09-16 16:04:37 -070085int sysctl_sctp_rmem[3];
86int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/* Set up the proc fs entry for the SCTP protocol. */
Christoph Paaschf5f417c2012-12-06 03:03:12 +000089static int __net_init sctp_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Florian Westphalc4e85f82008-07-18 23:03:44 -070091#ifdef CONFIG_PROC_FS
Eric W. Biederman13d782f2012-08-06 08:45:15 +000092 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
93 if (!net->sctp.proc_net_sctp)
94 goto out_proc_net_sctp;
95 if (sctp_snmp_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -070096 goto out_snmp_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +000097 if (sctp_eps_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -070098 goto out_eps_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +000099 if (sctp_assocs_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -0700100 goto out_assocs_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000101 if (sctp_remaddr_proc_init(net))
David S. Millercaea9022008-06-16 18:25:48 -0700102 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 return 0;
105
David S. Millercaea9022008-06-16 18:25:48 -0700106out_remaddr_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000107 sctp_assocs_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700108out_assocs_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000109 sctp_eps_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700110out_eps_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000111 sctp_snmp_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700112out_snmp_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000113 remove_proc_entry("sctp", net->proc_net);
114 net->sctp.proc_net_sctp = NULL;
115out_proc_net_sctp:
Randy Dunlap157653c2008-11-27 15:30:53 -0800116 return -ENOMEM;
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000117#endif /* CONFIG_PROC_FS */
118 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900121/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 * Note: Do not make this __exit as it is used in the init error
123 * path.
124 */
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000125static void sctp_proc_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700127#ifdef CONFIG_PROC_FS
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000128 sctp_snmp_proc_exit(net);
129 sctp_eps_proc_exit(net);
130 sctp_assocs_proc_exit(net);
131 sctp_remaddr_proc_exit(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000133 remove_proc_entry("sctp", net->proc_net);
134 net->sctp.proc_net_sctp = NULL;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700135#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
138/* Private helper to extract ipv4 address and stash them in
139 * the protocol structure.
140 */
141static void sctp_v4_copy_addrlist(struct list_head *addrlist,
142 struct net_device *dev)
143{
144 struct in_device *in_dev;
145 struct in_ifaddr *ifa;
146 struct sctp_sockaddr_entry *addr;
147
148 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700149 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 rcu_read_unlock();
151 return;
152 }
153
154 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
155 /* Add the address to the local list. */
156 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
157 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800158 addr->a.v4.sin_family = AF_INET;
159 addr->a.v4.sin_port = 0;
160 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700161 addr->valid = 1;
162 INIT_LIST_HEAD(&addr->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 list_add_tail(&addr->list, addrlist);
164 }
165 }
166
167 rcu_read_unlock();
168}
169
170/* Extract our IP addresses from the system and stash them in the
171 * protocol structure.
172 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000173static void sctp_get_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 struct net_device *dev;
176 struct list_head *pos;
177 struct sctp_af *af;
178
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800179 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000180 for_each_netdev_rcu(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 __list_for_each(pos, &sctp_address_families) {
182 af = list_entry(pos, struct sctp_af, list);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000183 af->copy_addrlist(&net->sctp.local_addr_list, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800186 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189/* Free the existing local addresses. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000190static void sctp_free_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 struct sctp_sockaddr_entry *addr;
193 struct list_head *pos, *temp;
194
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000195 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
197 list_del(pos);
198 kfree(addr);
199 }
200}
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202/* Copy the local addresses which are valid for 'scope' into 'bp'. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000203int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
204 sctp_scope_t scope, gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 struct sctp_sockaddr_entry *addr;
207 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Vlad Yasevich29303542007-09-16 16:02:12 -0700209 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000210 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -0700211 if (!addr->valid)
212 continue;
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +0000213 if (sctp_in_scope(net, &addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 /* Now that the address is in scope, check to see if
215 * the address type is really supported by the local
216 * sock as well as the remote peer.
217 */
Al Viro6244be42006-11-20 17:21:44 -0800218 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800220 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 (copy_flags & SCTP_ADDR6_ALLOWED) &&
222 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800223 error = sctp_add_bind_addr(bp, &addr->a,
224 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 if (error)
226 goto end_copy;
227 }
228 }
229 }
230
231end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700232 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return error;
234}
235
236/* Initialize a sctp_addr from in incoming skb. */
237static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
238 int is_saddr)
239{
240 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800241 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 struct sctphdr *sh;
243
244 port = &addr->v4.sin_port;
245 addr->v4.sin_family = AF_INET;
246
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300247 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800249 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700250 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800252 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700253 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 }
255 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
256}
257
258/* Initialize an sctp_addr from a socket. */
259static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
260{
261 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800262 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000263 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
266/* Initialize sk->sk_rcv_saddr from sctp_addr. */
267static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
268{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000269 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
272/* Initialize sk->sk_daddr from sctp_addr. */
273static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
274{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000275 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276}
277
278/* Initialize a sctp_addr from an address parameter. */
279static void sctp_v4_from_addr_param(union sctp_addr *addr,
280 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800281 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
283 addr->v4.sin_family = AF_INET;
284 addr->v4.sin_port = port;
285 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
286}
287
288/* Initialize an address parameter from a sctp_addr and return the length
289 * of the address parameter.
290 */
291static int sctp_v4_to_addr_param(const union sctp_addr *addr,
292 union sctp_addr_param *param)
293{
294 int length = sizeof(sctp_ipv4addr_param_t);
295
296 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800297 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900298 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 return length;
301}
302
303/* Initialize a sctp_addr from a dst_entry. */
David S. Miller18a353f42011-05-03 20:55:05 -0700304static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
Al Viro854d43a2006-11-20 17:06:24 -0800305 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 saddr->v4.sin_family = AF_INET;
308 saddr->v4.sin_port = port;
David S. Miller18a353f42011-05-03 20:55:05 -0700309 saddr->v4.sin_addr.s_addr = fl4->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
312/* Compare two addresses exactly. */
313static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
314 const union sctp_addr *addr2)
315{
316 if (addr1->sa.sa_family != addr2->sa.sa_family)
317 return 0;
318 if (addr1->v4.sin_port != addr2->v4.sin_port)
319 return 0;
320 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
321 return 0;
322
323 return 1;
324}
325
326/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800327static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700330 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 addr->v4.sin_port = port;
332}
333
334/* Is this a wildcard address? */
335static int sctp_v4_is_any(const union sctp_addr *addr)
336{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700337 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338}
339
340/* This function checks if the address is a valid address to be used for
341 * SCTP binding.
342 *
343 * Output:
344 * Return 0 - If the address is a non-unicast or an illegal address.
345 * Return 1 - If the address is a unicast.
346 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700347static int sctp_v4_addr_valid(union sctp_addr *addr,
348 struct sctp_sock *sp,
349 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700351 /* IPv4 addresses not allowed */
352 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
353 return 0;
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800356 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return 0;
358
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900359 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000360 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900361 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 return 1;
364}
365
366/* Should this be available for binding? */
367static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
368{
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000369 struct net *net = sock_net(&sp->inet.sk);
370 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Al Viroe6f1ceb2008-03-17 22:44:53 -0700373 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700374 ret != RTN_LOCAL &&
375 !sp->inet.freebind &&
376 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700378
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700379 if (ipv6_only_sock(sctp_opt2sk(sp)))
380 return 0;
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return 1;
383}
384
385/* Checking the loopback, private and other address scopes as defined in
386 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
387 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
388 *
389 * Level 0 - unusable SCTP addresses
390 * Level 1 - loopback address
391 * Level 2 - link-local addresses
392 * Level 3 - private addresses.
393 * Level 4 - global addresses
394 * For INIT and INIT-ACK address list, let L be the level of
395 * of requested destination address, sender and receiver
396 * SHOULD include all of its addresses with level greater
397 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530398 *
399 * IPv4 scoping can be controlled through sysctl option
400 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 */
402static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
403{
404 sctp_scope_t retval;
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800407 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800409 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800411 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800413 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
414 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
415 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 retval = SCTP_SCOPE_PRIVATE;
417 } else {
418 retval = SCTP_SCOPE_GLOBAL;
419 }
420
421 return retval;
422}
423
424/* Returns a valid dst cache entry for the given source and destination ip
425 * addresses. If an association is passed, trys to get a dst entry with a
426 * source address that matches an address in the bind address list.
427 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000428static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
429 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000431 struct sctp_association *asoc = t->asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 struct rtable *rt;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000433 struct flowi4 *fl4 = &fl->u.ip4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 struct dst_entry *dst = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000437 union sctp_addr *daddr = &t->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 union sctp_addr dst_saddr;
439
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000440 memset(fl4, 0x0, sizeof(struct flowi4));
441 fl4->daddr = daddr->v4.sin_addr.s_addr;
442 fl4->fl4_dport = daddr->v4.sin_port;
443 fl4->flowi4_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (asoc) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000445 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
446 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
447 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400449 if (saddr) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000450 fl4->saddr = saddr->v4.sin_addr.s_addr;
451 fl4->fl4_sport = saddr->v4.sin_port;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400452 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Harvey Harrison21454aa2008-10-31 00:54:56 -0700454 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000455 __func__, &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000457 rt = ip_route_output_key(sock_net(sk), fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800458 if (!IS_ERR(rt))
Changli Gaod8d1f302010-06-10 23:31:35 -0700459 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
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 */
David S. Miller18a353f42011-05-03 20:55:05 -0700473 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700474 rcu_read_lock();
475 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Michio Honda8a07eb02011-04-26 20:19:36 +0900476 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
477 (laddr->state != SCTP_ADDR_SRC &&
478 !asoc->src_out_of_asoc_ok))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700479 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800480 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 goto out_unlock;
482 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700483 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 /* None of the bound addresses match the source address of the
486 * dst. So release it.
487 */
488 dst_release(dst);
489 dst = NULL;
490 }
491
492 /* Walk through the bind address list and try to get a dst that
493 * matches a bind address as the source address.
494 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700495 rcu_read_lock();
496 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
497 if (!laddr->valid)
498 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800499 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800500 (AF_INET == laddr->a.sa.sa_family)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000501 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
502 fl4->fl4_sport = laddr->a.v4.sin_port;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000503 rt = ip_route_output_key(sock_net(sk), fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800504 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700505 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 goto out_unlock;
507 }
508 }
509 }
510
511out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700512 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513out:
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000514 t->dst = dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 if (dst)
Harvey Harrison21454aa2008-10-31 00:54:56 -0700516 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
David S. Miller18a353f42011-05-03 20:55:05 -0700517 &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 else
519 SCTP_DEBUG_PRINTK("NO ROUTE\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520}
521
522/* For v4, the source address is cached in the route entry(dst). So no need
523 * to cache it separately and hence this is an empty routine.
524 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900525static void sctp_v4_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000526 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000527 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000529 union sctp_addr *saddr = &t->saddr;
530 struct rtable *rt = (struct rtable *)t->dst;
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (rt) {
533 saddr->v4.sin_family = AF_INET;
David S. Miller902ebd32011-05-09 14:49:13 -0700534 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 }
536}
537
538/* What interface did this skb arrive on? */
539static int sctp_v4_skb_iif(const struct sk_buff *skb)
540{
David S. Miller92101b32012-07-23 16:29:00 -0700541 return inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
544/* Was this packet marked by Explicit Congestion Notification? */
545static int sctp_v4_is_ce(const struct sk_buff *skb)
546{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700547 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548}
549
550/* Create and initialize a new sk for the socket returned by accept(). */
551static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
552 struct sctp_association *asoc)
553{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900554 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700555 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000556 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 if (!newsk)
559 goto out;
560
561 sock_init_data(NULL, newsk);
562
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000563 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 sock_reset_flag(newsk, SOCK_ZAPPED);
565
566 newinet = inet_sk(newsk);
567
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000568 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700570 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 if (newsk->sk_prot->init(newsk)) {
573 sk_common_release(newsk);
574 newsk = NULL;
575 }
576
577out:
578 return newsk;
579}
580
581/* Map address, empty for v4 family */
582static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
583{
584 /* Empty */
585}
586
587/* Dump the v4 addr to the seq file. */
588static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
589{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700590 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700593static void sctp_v4_ecn_capable(struct sock *sk)
594{
595 INET_ECN_xmit(sk);
596}
597
Michio Honda9f7d6532011-04-26 19:32:51 +0900598void sctp_addr_wq_timeout_handler(unsigned long arg)
599{
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000600 struct net *net = (struct net *)arg;
Michio Honda9f7d6532011-04-26 19:32:51 +0900601 struct sctp_sockaddr_entry *addrw, *temp;
602 struct sctp_sock *sp;
603
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000604 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900605
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000606 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900607 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000608 " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
Michio Honda9f7d6532011-04-26 19:32:51 +0900609 addrw);
610
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000611#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900612 /* Now we send an ASCONF for each association */
613 /* Note. we currently don't handle link local IPv6 addressees */
614 if (addrw->a.sa.sa_family == AF_INET6) {
615 struct in6_addr *in6;
616
617 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
618 IPV6_ADDR_LINKLOCAL)
619 goto free_next;
620
621 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000622 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
Michio Honda9f7d6532011-04-26 19:32:51 +0900623 addrw->state == SCTP_ADDR_NEW) {
624 unsigned long timeo_val;
625
626 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
627 SCTP_ADDRESS_TICK_DELAY);
628 timeo_val = jiffies;
629 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000630 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900631 break;
632 }
633 }
David S. Miller5d0c90c2011-06-06 13:05:55 -0700634#endif
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000635 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900636 struct sock *sk;
637
638 sk = sctp_opt2sk(sp);
639 /* ignore bound-specific endpoints */
640 if (!sctp_is_ep_boundall(sk))
641 continue;
642 sctp_bh_lock_sock(sk);
643 if (sctp_asconf_mgmt(sp, addrw) < 0)
644 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
645 sctp_bh_unlock_sock(sk);
646 }
Daniel Halperin39d84a52012-06-18 11:04:55 +0000647#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900648free_next:
Daniel Halperin39d84a52012-06-18 11:04:55 +0000649#endif
Michio Honda9f7d6532011-04-26 19:32:51 +0900650 list_del(&addrw->list);
651 kfree(addrw);
652 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000653 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900654}
655
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000656static void sctp_free_addr_wq(struct net *net)
Michio Honda9f7d6532011-04-26 19:32:51 +0900657{
658 struct sctp_sockaddr_entry *addrw;
659 struct sctp_sockaddr_entry *temp;
660
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000661 spin_lock_bh(&net->sctp.addr_wq_lock);
662 del_timer(&net->sctp.addr_wq_timer);
663 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900664 list_del(&addrw->list);
665 kfree(addrw);
666 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000667 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900668}
669
670/* lookup the entry for the same address in the addr_waitq
671 * sctp_addr_wq MUST be locked
672 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000673static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
674 struct sctp_sockaddr_entry *addr)
Michio Honda9f7d6532011-04-26 19:32:51 +0900675{
676 struct sctp_sockaddr_entry *addrw;
677
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000678 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900679 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
680 continue;
681 if (addrw->a.sa.sa_family == AF_INET) {
682 if (addrw->a.v4.sin_addr.s_addr ==
683 addr->a.v4.sin_addr.s_addr)
684 return addrw;
685 } else if (addrw->a.sa.sa_family == AF_INET6) {
686 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
687 &addr->a.v6.sin6_addr))
688 return addrw;
689 }
690 }
691 return NULL;
692}
693
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000694void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
Michio Honda9f7d6532011-04-26 19:32:51 +0900695{
696 struct sctp_sockaddr_entry *addrw;
697 unsigned long timeo_val;
698
699 /* first, we check if an opposite message already exist in the queue.
700 * If we found such message, it is removed.
701 * This operation is a bit stupid, but the DHCP client attaches the
702 * new address after a couple of addition and deletion of that address
703 */
704
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000705 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900706 /* Offsets existing events in addr_wq */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000707 addrw = sctp_addr_wq_lookup(net, addr);
Michio Honda9f7d6532011-04-26 19:32:51 +0900708 if (addrw) {
709 if (addrw->state != cmd) {
710 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
711 " in wq %p\n", addrw->state, &addrw->a,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000712 &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900713 list_del(&addrw->list);
714 kfree(addrw);
715 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000716 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900717 return;
718 }
719
720 /* OK, we have to add the new address to the wait queue */
721 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
722 if (addrw == NULL) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000723 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900724 return;
725 }
726 addrw->state = cmd;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000727 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900728 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000729 " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900730
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000731 if (!timer_pending(&net->sctp.addr_wq_timer)) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900732 timeo_val = jiffies;
733 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000734 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900735 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000736 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900737}
738
Vlad Yasevich29303542007-09-16 16:02:12 -0700739/* Event handler for inet address addition/deletion events.
740 * The sctp_local_addr_list needs to be protocted by a spin lock since
741 * multiple notifiers (say IPv4 and IPv6) may be running at the same
742 * time and thus corrupt the list.
743 * The reader side is protected with RCU.
744 */
Adrian Bunk24123182006-12-20 16:08:22 -0800745static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
746 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800748 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700749 struct sctp_sockaddr_entry *addr = NULL;
750 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000751 struct net *net = dev_net(ifa->ifa_dev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700752 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800754 switch (ev) {
755 case NETDEV_UP:
756 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
757 if (addr) {
758 addr->a.v4.sin_family = AF_INET;
759 addr->a.v4.sin_port = 0;
760 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700761 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000762 spin_lock_bh(&net->sctp.local_addr_lock);
763 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
764 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
765 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800766 }
767 break;
768 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000769 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700770 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000771 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700772 if (addr->a.sa.sa_family == AF_INET &&
773 addr->a.v4.sin_addr.s_addr ==
774 ifa->ifa_local) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000775 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700776 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700777 addr->valid = 0;
778 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800779 break;
780 }
781 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000782 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700783 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800784 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800785 break;
786 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788 return NOTIFY_DONE;
789}
790
791/*
792 * Initialize the control inode/socket with a control endpoint data
793 * structure. This endpoint is reserved exclusively for the OOTB processing.
794 */
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000795static int sctp_ctl_sock_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
797 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800798 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 if (sctp_get_pf_specific(PF_INET6))
801 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000803 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
804 SOCK_SEQPACKET, IPPROTO_SCTP, net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800805
806 /* If IPv6 socket could not be created, try the IPv4 socket */
807 if (err < 0 && family == PF_INET6)
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000808 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800809 SOCK_SEQPACKET, IPPROTO_SCTP,
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000810 net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000813 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 return err;
815 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 return 0;
817}
818
819/* Register address family specific functions. */
820int sctp_register_af(struct sctp_af *af)
821{
822 switch (af->sa_family) {
823 case AF_INET:
824 if (sctp_af_v4_specific)
825 return 0;
826 sctp_af_v4_specific = af;
827 break;
828 case AF_INET6:
829 if (sctp_af_v6_specific)
830 return 0;
831 sctp_af_v6_specific = af;
832 break;
833 default:
834 return 0;
835 }
836
837 INIT_LIST_HEAD(&af->list);
838 list_add_tail(&af->list, &sctp_address_families);
839 return 1;
840}
841
842/* Get the table of functions for manipulating a particular address
843 * family.
844 */
845struct sctp_af *sctp_get_af_specific(sa_family_t family)
846{
847 switch (family) {
848 case AF_INET:
849 return sctp_af_v4_specific;
850 case AF_INET6:
851 return sctp_af_v6_specific;
852 default:
853 return NULL;
854 }
855}
856
857/* Common code to initialize a AF_INET msg_name. */
858static void sctp_inet_msgname(char *msgname, int *addr_len)
859{
860 struct sockaddr_in *sin;
861
862 sin = (struct sockaddr_in *)msgname;
863 *addr_len = sizeof(struct sockaddr_in);
864 sin->sin_family = AF_INET;
865 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
866}
867
868/* Copy the primary address of the peer primary address as the msg_name. */
869static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
870 int *addr_len)
871{
872 struct sockaddr_in *sin, *sinfrom;
873
874 if (msgname) {
875 struct sctp_association *asoc;
876
877 asoc = event->asoc;
878 sctp_inet_msgname(msgname, addr_len);
879 sin = (struct sockaddr_in *)msgname;
880 sinfrom = &asoc->peer.primary_addr.v4;
881 sin->sin_port = htons(asoc->peer.port);
882 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
883 }
884}
885
886/* Initialize and copy out a msgname from an inbound skb. */
887static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
888{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300890 struct sctphdr *sh = sctp_hdr(skb);
891 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700895 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 }
897}
898
899/* Do we support this AF? */
900static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
901{
902 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000903 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904}
905
906/* Address matching with wildcards allowed. */
907static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
908 const union sctp_addr *addr2,
909 struct sctp_sock *opt)
910{
911 /* PF_INET only supports AF_INET addresses. */
912 if (addr1->sa.sa_family != addr2->sa.sa_family)
913 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700914 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
915 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 return 1;
917 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
918 return 1;
919
920 return 0;
921}
922
923/* Verify that provided sockaddr looks bindable. Common verification has
924 * already been taken care of.
925 */
926static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
927{
928 return sctp_v4_available(addr, opt);
929}
930
931/* Verify that sockaddr looks sendable. Common verification has already
932 * been taken care of.
933 */
934static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
935{
936 return 1;
937}
938
939/* Fill in Supported Address Type information for INIT and INIT-ACK
940 * chunks. Returns number of addresses supported.
941 */
942static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800943 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944{
945 types[0] = SCTP_PARAM_IPV4_ADDRESS;
946 return 1;
947}
948
949/* Wrapper routine that calls the ip transmit routine. */
950static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700951 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952{
Herbert Xuf8803742008-08-03 21:15:08 -0700953 struct inet_sock *inet = inet_sk(skb->sk);
954
Harvey Harrison21454aa2008-10-31 00:54:56 -0700955 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800956 __func__, skb, skb->len,
David S. Miller7ef73bc2011-05-08 21:14:41 -0700957 &transport->fl.u.ip4.saddr,
958 &transport->fl.u.ip4.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Herbert Xuf8803742008-08-03 21:15:08 -0700960 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
961 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
962
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000963 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
David S. Millerd9d8da82011-05-06 22:23:20 -0700964 return ip_queue_xmit(skb, &transport->fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965}
966
Neil Horman15efbe72008-02-15 09:53:59 -0500967static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
969static struct sctp_pf sctp_pf_inet = {
970 .event_msgname = sctp_inet_event_msgname,
971 .skb_msgname = sctp_inet_skb_msgname,
972 .af_supported = sctp_inet_af_supported,
973 .cmp_addr = sctp_inet_cmp_addr,
974 .bind_verify = sctp_inet_bind_verify,
975 .send_verify = sctp_inet_send_verify,
976 .supported_addrs = sctp_inet_supported_addrs,
977 .create_accept_sk = sctp_v4_create_accept_sk,
978 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500979 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980};
981
982/* Notifier for inetaddr addition/deletion events. */
983static struct notifier_block sctp_inetaddr_notifier = {
984 .notifier_call = sctp_inetaddr_event,
985};
986
987/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800988static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800989 .family = PF_INET,
990 .owner = THIS_MODULE,
991 .release = inet_release, /* Needs to be wrapped... */
992 .bind = inet_bind,
993 .connect = inet_dgram_connect,
994 .socketpair = sock_no_socketpair,
995 .accept = inet_accept,
996 .getname = inet_getname, /* Semantics are different. */
997 .poll = sctp_poll,
998 .ioctl = inet_ioctl,
999 .listen = sctp_inet_listen,
1000 .shutdown = inet_shutdown, /* Looks harmless. */
1001 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1002 .getsockopt = sock_common_getsockopt,
1003 .sendmsg = inet_sendmsg,
1004 .recvmsg = sock_common_recvmsg,
1005 .mmap = sock_no_mmap,
1006 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001007#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001008 .compat_setsockopt = compat_sock_common_setsockopt,
1009 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001010#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011};
1012
1013/* Registration with AF_INET family. */
1014static struct inet_protosw sctp_seqpacket_protosw = {
1015 .type = SOCK_SEQPACKET,
1016 .protocol = IPPROTO_SCTP,
1017 .prot = &sctp_prot,
1018 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 .no_check = 0,
1020 .flags = SCTP_PROTOSW_FLAG
1021};
1022static struct inet_protosw sctp_stream_protosw = {
1023 .type = SOCK_STREAM,
1024 .protocol = IPPROTO_SCTP,
1025 .prot = &sctp_prot,
1026 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 .no_check = 0,
1028 .flags = SCTP_PROTOSW_FLAG
1029};
1030
1031/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +00001032static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 .handler = sctp_rcv,
1034 .err_handler = sctp_v4_err,
1035 .no_policy = 1,
Eric W. Biedermanbb2db452012-08-06 08:46:26 +00001036 .netns_ok = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037};
1038
1039/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001040static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001041 .sa_family = AF_INET,
1042 .sctp_xmit = sctp_v4_xmit,
1043 .setsockopt = ip_setsockopt,
1044 .getsockopt = ip_getsockopt,
1045 .get_dst = sctp_v4_get_dst,
1046 .get_saddr = sctp_v4_get_saddr,
1047 .copy_addrlist = sctp_v4_copy_addrlist,
1048 .from_skb = sctp_v4_from_skb,
1049 .from_sk = sctp_v4_from_sk,
1050 .to_sk_saddr = sctp_v4_to_sk_saddr,
1051 .to_sk_daddr = sctp_v4_to_sk_daddr,
1052 .from_addr_param = sctp_v4_from_addr_param,
1053 .to_addr_param = sctp_v4_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001054 .cmp_addr = sctp_v4_cmp_addr,
1055 .addr_valid = sctp_v4_addr_valid,
1056 .inaddr_any = sctp_v4_inaddr_any,
1057 .is_any = sctp_v4_is_any,
1058 .available = sctp_v4_available,
1059 .scope = sctp_v4_scope,
1060 .skb_iif = sctp_v4_skb_iif,
1061 .is_ce = sctp_v4_is_ce,
1062 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001063 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001064 .net_header_len = sizeof(struct iphdr),
1065 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001066#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001067 .compat_setsockopt = compat_ip_setsockopt,
1068 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001069#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070};
1071
1072struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1073
1074 switch (family) {
1075 case PF_INET:
1076 return sctp_pf_inet_specific;
1077 case PF_INET6:
1078 return sctp_pf_inet6_specific;
1079 default:
1080 return NULL;
1081 }
1082}
1083
1084/* Register the PF specific function table. */
1085int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1086{
1087 switch (family) {
1088 case PF_INET:
1089 if (sctp_pf_inet_specific)
1090 return 0;
1091 sctp_pf_inet_specific = pf;
1092 break;
1093 case PF_INET6:
1094 if (sctp_pf_inet6_specific)
1095 return 0;
1096 sctp_pf_inet6_specific = pf;
1097 break;
1098 default:
1099 return 0;
1100 }
1101 return 1;
1102}
1103
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001104static inline int init_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105{
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001106 return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001107 sizeof(struct sctp_mib),
1108 __alignof__(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109}
1110
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001111static inline void cleanup_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112{
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001113 snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114}
1115
Vlad Yasevich270637a2008-03-20 15:17:14 -07001116static void sctp_v4_pf_init(void)
1117{
1118 /* Initialize the SCTP specific PF functions. */
1119 sctp_register_pf(&sctp_pf_inet, PF_INET);
1120 sctp_register_af(&sctp_af_inet);
1121}
1122
1123static void sctp_v4_pf_exit(void)
1124{
1125 list_del(&sctp_af_inet.list);
1126}
1127
1128static int sctp_v4_protosw_init(void)
1129{
1130 int rc;
1131
1132 rc = proto_register(&sctp_prot, 1);
1133 if (rc)
1134 return rc;
1135
1136 /* Register SCTP(UDP and TCP style) with socket layer. */
1137 inet_register_protosw(&sctp_seqpacket_protosw);
1138 inet_register_protosw(&sctp_stream_protosw);
1139
1140 return 0;
1141}
1142
1143static void sctp_v4_protosw_exit(void)
1144{
1145 inet_unregister_protosw(&sctp_stream_protosw);
1146 inet_unregister_protosw(&sctp_seqpacket_protosw);
1147 proto_unregister(&sctp_prot);
1148}
1149
1150static int sctp_v4_add_protocol(void)
1151{
1152 /* Register notifier for inet address additions/deletions. */
1153 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1154
1155 /* Register SCTP with inet layer. */
1156 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1157 return -EAGAIN;
1158
1159 return 0;
1160}
1161
1162static void sctp_v4_del_protocol(void)
1163{
1164 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1165 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1166}
1167
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001168static int __net_init sctp_net_init(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001169{
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001170 int status;
1171
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001172 /*
1173 * 14. Suggested SCTP Protocol Parameter Values
1174 */
1175 /* The following protocol parameters are RECOMMENDED: */
1176 /* RTO.Initial - 3 seconds */
1177 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1178 /* RTO.Min - 1 second */
1179 net->sctp.rto_min = SCTP_RTO_MIN;
1180 /* RTO.Max - 60 seconds */
1181 net->sctp.rto_max = SCTP_RTO_MAX;
1182 /* RTO.Alpha - 1/8 */
1183 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1184 /* RTO.Beta - 1/4 */
1185 net->sctp.rto_beta = SCTP_RTO_BETA;
1186
1187 /* Valid.Cookie.Life - 60 seconds */
1188 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1189
1190 /* Whether Cookie Preservative is enabled(1) or not(0) */
1191 net->sctp.cookie_preserve_enable = 1;
1192
Neil Horman3c681982012-10-24 09:20:03 +00001193 /* Default sctp sockets to use md5 as their hmac alg */
Neil Horman0d0863b2012-12-14 15:22:01 +00001194#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
Neil Horman3c681982012-10-24 09:20:03 +00001195 net->sctp.sctp_hmac_alg = "md5";
Neil Horman0d0863b2012-12-14 15:22:01 +00001196#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
Neil Horman3c681982012-10-24 09:20:03 +00001197 net->sctp.sctp_hmac_alg = "sha1";
1198#else
1199 net->sctp.sctp_hmac_alg = NULL;
1200#endif
1201
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001202 /* Max.Burst - 4 */
1203 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1204
1205 /* Association.Max.Retrans - 10 attempts
1206 * Path.Max.Retrans - 5 attempts (per destination address)
1207 * Max.Init.Retransmits - 8 attempts
1208 */
1209 net->sctp.max_retrans_association = 10;
1210 net->sctp.max_retrans_path = 5;
1211 net->sctp.max_retrans_init = 8;
1212
1213 /* Sendbuffer growth - do per-socket accounting */
1214 net->sctp.sndbuf_policy = 0;
1215
1216 /* Rcvbuffer growth - do per-socket accounting */
1217 net->sctp.rcvbuf_policy = 0;
1218
1219 /* HB.interval - 30 seconds */
1220 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1221
1222 /* delayed SACK timeout */
1223 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1224
1225 /* Disable ADDIP by default. */
1226 net->sctp.addip_enable = 0;
1227 net->sctp.addip_noauth = 0;
1228 net->sctp.default_auto_asconf = 0;
1229
1230 /* Enable PR-SCTP by default. */
1231 net->sctp.prsctp_enable = 1;
1232
1233 /* Disable AUTH by default. */
1234 net->sctp.auth_enable = 0;
1235
1236 /* Set SCOPE policy to enabled */
1237 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1238
1239 /* Set the default rwnd update threshold */
1240 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1241
1242 /* Initialize maximum autoclose timeout. */
1243 net->sctp.max_autoclose = INT_MAX / HZ;
1244
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001245 status = sctp_sysctl_net_register(net);
1246 if (status)
1247 goto err_sysctl_register;
1248
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001249 /* Allocate and initialise sctp mibs. */
1250 status = init_sctp_mibs(net);
1251 if (status)
1252 goto err_init_mibs;
1253
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001254 /* Initialize proc fs directory. */
1255 status = sctp_proc_init(net);
1256 if (status)
1257 goto err_init_proc;
1258
1259 sctp_dbg_objcnt_init(net);
1260
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001261 /* Initialize the control inode/socket for handling OOTB packets. */
1262 if ((status = sctp_ctl_sock_init(net))) {
1263 pr_err("Failed to initialize the SCTP control sock\n");
1264 goto err_ctl_sock_init;
1265 }
1266
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001267 /* Initialize the local address list. */
1268 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1269 spin_lock_init(&net->sctp.local_addr_lock);
1270 sctp_get_local_addr_list(net);
1271
1272 /* Initialize the address event list */
1273 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1274 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1275 spin_lock_init(&net->sctp.addr_wq_lock);
1276 net->sctp.addr_wq_timer.expires = 0;
1277 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1278 (unsigned long)net);
1279
1280 return 0;
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001281
1282err_ctl_sock_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001283 sctp_dbg_objcnt_exit(net);
1284 sctp_proc_exit(net);
1285err_init_proc:
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001286 cleanup_sctp_mibs(net);
1287err_init_mibs:
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001288 sctp_sysctl_net_unregister(net);
1289err_sysctl_register:
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001290 return status;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001291}
1292
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001293static void __net_exit sctp_net_exit(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001294{
1295 /* Free the local address list */
1296 sctp_free_addr_wq(net);
1297 sctp_free_local_addr_list(net);
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001298
1299 /* Free the control endpoint. */
1300 inet_ctl_sock_destroy(net->sctp.ctl_sock);
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001301
1302 sctp_dbg_objcnt_exit(net);
1303
1304 sctp_proc_exit(net);
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001305 cleanup_sctp_mibs(net);
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001306 sctp_sysctl_net_unregister(net);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001307}
1308
1309static struct pernet_operations sctp_net_ops = {
1310 .init = sctp_net_init,
1311 .exit = sctp_net_exit,
1312};
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314/* Initialize the universe into something sensible. */
1315SCTP_STATIC __init int sctp_init(void)
1316{
1317 int i;
1318 int status = -EINVAL;
1319 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001320 unsigned long limit;
1321 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 int order;
1323
1324 /* SCTP_DEBUG sanity check. */
1325 if (!sctp_sanity_check())
1326 goto out;
1327
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001328 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 status = -ENOBUFS;
1330 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1331 sizeof(struct sctp_bind_bucket),
1332 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001333 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001335 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336
1337 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1338 sizeof(struct sctp_chunk),
1339 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001340 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 if (!sctp_chunk_cachep)
1342 goto err_chunk_cachep;
1343
Eric W. Biederman632c9282012-08-06 08:44:24 +00001344 status = percpu_counter_init(&sctp_sockets_allocated, 0);
1345 if (status)
1346 goto err_percpu_counter_init;
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 /* Implementation specific variables. */
1349
1350 /* Initialize default stream count setup information. */
1351 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1352 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1353
1354 /* Initialize handle used for association ids. */
1355 idr_init(&sctp_assocs_id);
1356
Eric Dumazetf03d78d2011-07-07 00:27:05 -07001357 limit = nr_free_buffer_pages() / 8;
Neil Horman4d93df02007-08-15 16:07:44 -07001358 limit = max(limit, 128UL);
1359 sysctl_sctp_mem[0] = limit / 4 * 3;
1360 sysctl_sctp_mem[1] = limit;
1361 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1362
1363 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1364 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1365 max_share = min(4UL*1024*1024, limit);
1366
Vlad Yasevich845525a2008-07-18 23:08:21 -07001367 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001368 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
Neil Horman4d93df02007-08-15 16:07:44 -07001369 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1370
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001371 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001372 sysctl_sctp_wmem[1] = 16*1024;
1373 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1374
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 /* Size and allocate the association hash table.
1376 * The methodology is similar to that of the tcp hash tables.
1377 */
Jan Beulich44813742009-09-21 17:03:05 -07001378 if (totalram_pages >= (128 * 1024))
1379 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 else
Jan Beulich44813742009-09-21 17:03:05 -07001381 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
1383 for (order = 0; (1UL << order) < goal; order++)
1384 ;
1385
1386 do {
1387 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1388 sizeof(struct sctp_hashbucket);
1389 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1390 continue;
1391 sctp_assoc_hashtable = (struct sctp_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001392 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 } while (!sctp_assoc_hashtable && --order > 0);
1394 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001395 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 status = -ENOMEM;
1397 goto err_ahash_alloc;
1398 }
1399 for (i = 0; i < sctp_assoc_hashsize; i++) {
1400 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001401 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 }
1403
1404 /* Allocate and initialize the endpoint hash table. */
1405 sctp_ep_hashsize = 64;
1406 sctp_ep_hashtable = (struct sctp_hashbucket *)
1407 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1408 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001409 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 status = -ENOMEM;
1411 goto err_ehash_alloc;
1412 }
1413 for (i = 0; i < sctp_ep_hashsize; i++) {
1414 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001415 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 }
1417
1418 /* Allocate and initialize the SCTP port hash table. */
1419 do {
1420 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1421 sizeof(struct sctp_bind_hashbucket);
1422 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1423 continue;
1424 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001425 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 } while (!sctp_port_hashtable && --order > 0);
1427 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001428 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 status = -ENOMEM;
1430 goto err_bhash_alloc;
1431 }
1432 for (i = 0; i < sctp_port_hashsize; i++) {
1433 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001434 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 }
1436
Joe Perches145ce502010-08-24 13:21:08 +00001437 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 sctp_assoc_hashsize, sctp_port_hashsize);
1439
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 sctp_sysctl_register();
1441
1442 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001443 sctp_v4_pf_init();
1444 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
Vlad Yasevich270637a2008-03-20 15:17:14 -07001446 status = sctp_v4_protosw_init();
1447
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001448 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001449 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001450
Vlad Yasevich270637a2008-03-20 15:17:14 -07001451 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001453 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001455 status = register_pernet_subsys(&sctp_net_ops);
1456 if (status)
1457 goto err_register_pernet_subsys;
1458
Vlad Yasevich270637a2008-03-20 15:17:14 -07001459 status = sctp_v4_add_protocol();
1460 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001461 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001462
1463 /* Register SCTP with inet6 layer. */
1464 status = sctp_v6_add_protocol();
1465 if (status)
1466 goto err_v6_add_protocol;
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 status = 0;
1469out:
1470 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001471err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001472 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001473err_add_protocol:
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001474 unregister_pernet_subsys(&sctp_net_ops);
1475err_register_pernet_subsys:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001476 sctp_v6_protosw_exit();
1477err_v6_protosw_init:
1478 sctp_v4_protosw_exit();
1479err_protosw_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001480 sctp_v4_pf_exit();
1481 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 free_pages((unsigned long)sctp_port_hashtable,
1484 get_order(sctp_port_hashsize *
1485 sizeof(struct sctp_bind_hashbucket)));
1486err_bhash_alloc:
1487 kfree(sctp_ep_hashtable);
1488err_ehash_alloc:
1489 free_pages((unsigned long)sctp_assoc_hashtable,
1490 get_order(sctp_assoc_hashsize *
1491 sizeof(struct sctp_hashbucket)));
1492err_ahash_alloc:
Eric W. Biederman632c9282012-08-06 08:44:24 +00001493 percpu_counter_destroy(&sctp_sockets_allocated);
1494err_percpu_counter_init:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 kmem_cache_destroy(sctp_chunk_cachep);
1496err_chunk_cachep:
1497 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 goto out;
1499}
1500
1501/* Exit handler for the SCTP protocol. */
1502SCTP_STATIC __exit void sctp_exit(void)
1503{
1504 /* BUG. This should probably do something useful like clean
1505 * up all the remaining associations and all that memory.
1506 */
1507
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001508 /* Unregister with inet6/inet layers. */
1509 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001510 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001512 unregister_pernet_subsys(&sctp_net_ops);
1513
Vlad Yasevich270637a2008-03-20 15:17:14 -07001514 /* Free protosw registrations */
1515 sctp_v6_protosw_exit();
1516 sctp_v4_protosw_exit();
1517
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001518 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001519 sctp_v6_pf_exit();
1520 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001521
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
1524 free_pages((unsigned long)sctp_assoc_hashtable,
1525 get_order(sctp_assoc_hashsize *
1526 sizeof(struct sctp_hashbucket)));
1527 kfree(sctp_ep_hashtable);
1528 free_pages((unsigned long)sctp_port_hashtable,
1529 get_order(sctp_port_hashsize *
1530 sizeof(struct sctp_bind_hashbucket)));
1531
Eric W. Biederman632c9282012-08-06 08:44:24 +00001532 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001534 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1535
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001536 kmem_cache_destroy(sctp_chunk_cachep);
1537 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538}
1539
1540module_init(sctp_init);
1541module_exit(sctp_exit);
1542
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001543/*
1544 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1545 */
1546MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001547MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1549MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
Lucas Nussbaum06e86802009-02-13 08:33:41 +00001550module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1551MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552MODULE_LICENSE("GPL");