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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
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080026 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020031 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 */
41
Joe Perches145ce502010-08-24 13:21:08 +000042#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/module.h>
45#include <linux/init.h>
46#include <linux/netdevice.h>
47#include <linux/inetdevice.h>
48#include <linux/seq_file.h>
Neil Horman4d93df02007-08-15 16:07:44 -070049#include <linux/bootmem.h>
Vlad Yasevich845525a2008-07-18 23:08:21 -070050#include <linux/highmem.h>
51#include <linux/swap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090052#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020053#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <net/protocol.h>
55#include <net/ip.h>
56#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020057#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <net/sctp/sctp.h>
59#include <net/addrconf.h>
60#include <net/inet_common.h>
61#include <net/inet_ecn.h>
62
63/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070064struct sctp_globals sctp_globals __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66struct idr sctp_assocs_id;
67DEFINE_SPINLOCK(sctp_assocs_id_lock);
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static struct sctp_pf *sctp_pf_inet6_specific;
70static struct sctp_pf *sctp_pf_inet_specific;
71static struct sctp_af *sctp_af_v4_specific;
72static struct sctp_af *sctp_af_v6_specific;
73
Christoph Lametere18b8902006-12-06 20:33:20 -080074struct kmem_cache *sctp_chunk_cachep __read_mostly;
75struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Eric Dumazet8d987e52010-11-09 23:24:26 +000077long sysctl_sctp_mem[3];
Vlad Yasevich007e3932007-09-16 16:04:37 -070078int sysctl_sctp_rmem[3];
79int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/* Set up the proc fs entry for the SCTP protocol. */
Christoph Paaschf5f417c2012-12-06 03:03:12 +000082static int __net_init sctp_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
Florian Westphalc4e85f82008-07-18 23:03:44 -070084#ifdef CONFIG_PROC_FS
Eric W. Biederman13d782f2012-08-06 08:45:15 +000085 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
86 if (!net->sctp.proc_net_sctp)
87 goto out_proc_net_sctp;
88 if (sctp_snmp_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -070089 goto out_snmp_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +000090 if (sctp_eps_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -070091 goto out_eps_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +000092 if (sctp_assocs_proc_init(net))
Wei Yongjun80896a32008-06-16 16:59:55 -070093 goto out_assocs_proc_init;
Eric W. Biederman13d782f2012-08-06 08:45:15 +000094 if (sctp_remaddr_proc_init(net))
David S. Millercaea9022008-06-16 18:25:48 -070095 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 return 0;
98
David S. Millercaea9022008-06-16 18:25:48 -070099out_remaddr_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000100 sctp_assocs_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700101out_assocs_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000102 sctp_eps_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700103out_eps_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000104 sctp_snmp_proc_exit(net);
Wei Yongjun80896a32008-06-16 16:59:55 -0700105out_snmp_proc_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000106 remove_proc_entry("sctp", net->proc_net);
107 net->sctp.proc_net_sctp = NULL;
108out_proc_net_sctp:
Randy Dunlap157653c2008-11-27 15:30:53 -0800109 return -ENOMEM;
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000110#endif /* CONFIG_PROC_FS */
111 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900114/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * Note: Do not make this __exit as it is used in the init error
116 * path.
117 */
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000118static void sctp_proc_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700120#ifdef CONFIG_PROC_FS
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000121 sctp_snmp_proc_exit(net);
122 sctp_eps_proc_exit(net);
123 sctp_assocs_proc_exit(net);
124 sctp_remaddr_proc_exit(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Eric W. Biederman13d782f2012-08-06 08:45:15 +0000126 remove_proc_entry("sctp", net->proc_net);
127 net->sctp.proc_net_sctp = NULL;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700128#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131/* Private helper to extract ipv4 address and stash them in
132 * the protocol structure.
133 */
134static void sctp_v4_copy_addrlist(struct list_head *addrlist,
135 struct net_device *dev)
136{
137 struct in_device *in_dev;
138 struct in_ifaddr *ifa;
139 struct sctp_sockaddr_entry *addr;
140
141 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700142 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 rcu_read_unlock();
144 return;
145 }
146
147 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
148 /* Add the address to the local list. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200149 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800151 addr->a.v4.sin_family = AF_INET;
152 addr->a.v4.sin_port = 0;
153 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700154 addr->valid = 1;
155 INIT_LIST_HEAD(&addr->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 list_add_tail(&addr->list, addrlist);
157 }
158 }
159
160 rcu_read_unlock();
161}
162
163/* Extract our IP addresses from the system and stash them in the
164 * protocol structure.
165 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000166static void sctp_get_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
168 struct net_device *dev;
169 struct list_head *pos;
170 struct sctp_af *af;
171
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800172 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000173 for_each_netdev_rcu(net, dev) {
Dave Jones2c0740e2013-06-17 22:26:52 -0400174 list_for_each(pos, &sctp_address_families) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 af = list_entry(pos, struct sctp_af, list);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000176 af->copy_addrlist(&net->sctp.local_addr_list, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
178 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800179 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/* Free the existing local addresses. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000183static void sctp_free_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
185 struct sctp_sockaddr_entry *addr;
186 struct list_head *pos, *temp;
187
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000188 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
190 list_del(pos);
191 kfree(addr);
192 }
193}
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195/* Copy the local addresses which are valid for 'scope' into 'bp'. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000196int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
197 sctp_scope_t scope, gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 struct sctp_sockaddr_entry *addr;
200 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Vlad Yasevich29303542007-09-16 16:02:12 -0700202 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000203 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -0700204 if (!addr->valid)
205 continue;
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +0000206 if (sctp_in_scope(net, &addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 /* Now that the address is in scope, check to see if
208 * the address type is really supported by the local
209 * sock as well as the remote peer.
210 */
Al Viro6244be42006-11-20 17:21:44 -0800211 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800213 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 (copy_flags & SCTP_ADDR6_ALLOWED) &&
215 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800216 error = sctp_add_bind_addr(bp, &addr->a,
217 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 if (error)
219 goto end_copy;
220 }
221 }
222 }
223
224end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700225 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return error;
227}
228
229/* Initialize a sctp_addr from in incoming skb. */
230static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
231 int is_saddr)
232{
233 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800234 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 struct sctphdr *sh;
236
237 port = &addr->v4.sin_port;
238 addr->v4.sin_family = AF_INET;
239
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300240 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800242 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700243 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800245 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700246 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
248 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
249}
250
251/* Initialize an sctp_addr from a socket. */
252static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
253{
254 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800255 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000256 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
258
259/* Initialize sk->sk_rcv_saddr from sctp_addr. */
260static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
261{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000262 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
265/* Initialize sk->sk_daddr from sctp_addr. */
266static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
267{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000268 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269}
270
271/* Initialize a sctp_addr from an address parameter. */
272static void sctp_v4_from_addr_param(union sctp_addr *addr,
273 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800274 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275{
276 addr->v4.sin_family = AF_INET;
277 addr->v4.sin_port = port;
278 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
279}
280
281/* Initialize an address parameter from a sctp_addr and return the length
282 * of the address parameter.
283 */
284static int sctp_v4_to_addr_param(const union sctp_addr *addr,
285 union sctp_addr_param *param)
286{
287 int length = sizeof(sctp_ipv4addr_param_t);
288
289 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800290 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900291 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 return length;
294}
295
296/* Initialize a sctp_addr from a dst_entry. */
David S. Miller18a353f42011-05-03 20:55:05 -0700297static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
Al Viro854d43a2006-11-20 17:06:24 -0800298 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 saddr->v4.sin_family = AF_INET;
301 saddr->v4.sin_port = port;
David S. Miller18a353f42011-05-03 20:55:05 -0700302 saddr->v4.sin_addr.s_addr = fl4->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
305/* Compare two addresses exactly. */
306static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
307 const union sctp_addr *addr2)
308{
309 if (addr1->sa.sa_family != addr2->sa.sa_family)
310 return 0;
311 if (addr1->v4.sin_port != addr2->v4.sin_port)
312 return 0;
313 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
314 return 0;
315
316 return 1;
317}
318
319/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800320static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
322 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700323 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 addr->v4.sin_port = port;
325}
326
327/* Is this a wildcard address? */
328static int sctp_v4_is_any(const union sctp_addr *addr)
329{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700330 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
333/* This function checks if the address is a valid address to be used for
334 * SCTP binding.
335 *
336 * Output:
337 * Return 0 - If the address is a non-unicast or an illegal address.
338 * Return 1 - If the address is a unicast.
339 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700340static int sctp_v4_addr_valid(union sctp_addr *addr,
341 struct sctp_sock *sp,
342 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700344 /* IPv4 addresses not allowed */
345 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
346 return 0;
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800349 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return 0;
351
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900352 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000353 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900354 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return 1;
357}
358
359/* Should this be available for binding? */
360static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
361{
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000362 struct net *net = sock_net(&sp->inet.sk);
363 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Al Viroe6f1ceb2008-03-17 22:44:53 -0700366 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700367 ret != RTN_LOCAL &&
368 !sp->inet.freebind &&
369 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700371
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700372 if (ipv6_only_sock(sctp_opt2sk(sp)))
373 return 0;
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 return 1;
376}
377
378/* Checking the loopback, private and other address scopes as defined in
379 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
380 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
381 *
382 * Level 0 - unusable SCTP addresses
383 * Level 1 - loopback address
384 * Level 2 - link-local addresses
385 * Level 3 - private addresses.
386 * Level 4 - global addresses
387 * For INIT and INIT-ACK address list, let L be the level of
388 * of requested destination address, sender and receiver
389 * SHOULD include all of its addresses with level greater
390 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530391 *
392 * IPv4 scoping can be controlled through sysctl option
393 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 */
395static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
396{
397 sctp_scope_t retval;
398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800400 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800402 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800404 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800406 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
407 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
408 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 retval = SCTP_SCOPE_PRIVATE;
410 } else {
411 retval = SCTP_SCOPE_GLOBAL;
412 }
413
414 return retval;
415}
416
417/* Returns a valid dst cache entry for the given source and destination ip
418 * addresses. If an association is passed, trys to get a dst entry with a
419 * source address that matches an address in the bind address list.
420 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000421static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
422 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000424 struct sctp_association *asoc = t->asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 struct rtable *rt;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000426 struct flowi4 *fl4 = &fl->u.ip4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 struct dst_entry *dst = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000430 union sctp_addr *daddr = &t->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 union sctp_addr dst_saddr;
432
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000433 memset(fl4, 0x0, sizeof(struct flowi4));
434 fl4->daddr = daddr->v4.sin_addr.s_addr;
435 fl4->fl4_dport = daddr->v4.sin_port;
436 fl4->flowi4_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (asoc) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000438 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
439 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
440 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400442 if (saddr) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000443 fl4->saddr = saddr->v4.sin_addr.s_addr;
444 fl4->fl4_sport = saddr->v4.sin_port;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400445 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Daniel Borkmannbb333812013-06-28 19:49:40 +0200447 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
448 &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000450 rt = ip_route_output_key(sock_net(sk), fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800451 if (!IS_ERR(rt))
Changli Gaod8d1f302010-06-10 23:31:35 -0700452 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 /* If there is no association or if a source address is passed, no
455 * more validation is required.
456 */
457 if (!asoc || saddr)
458 goto out;
459
460 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 if (dst) {
463 /* Walk through the bind address list and look for a bind
464 * address that matches the source address of the returned dst.
465 */
David S. Miller18a353f42011-05-03 20:55:05 -0700466 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700467 rcu_read_lock();
468 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Michio Honda8a07eb02011-04-26 20:19:36 +0900469 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
470 (laddr->state != SCTP_ADDR_SRC &&
471 !asoc->src_out_of_asoc_ok))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700472 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800473 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 goto out_unlock;
475 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700476 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 /* None of the bound addresses match the source address of the
479 * dst. So release it.
480 */
481 dst_release(dst);
482 dst = NULL;
483 }
484
485 /* Walk through the bind address list and try to get a dst that
486 * matches a bind address as the source address.
487 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700488 rcu_read_lock();
489 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
490 if (!laddr->valid)
491 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800492 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800493 (AF_INET == laddr->a.sa.sa_family)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000494 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
495 fl4->fl4_sport = laddr->a.v4.sin_port;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000496 rt = ip_route_output_key(sock_net(sk), fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800497 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700498 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 goto out_unlock;
500 }
501 }
502 }
503
504out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700505 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506out:
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000507 t->dst = dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 if (dst)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200509 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
510 &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 else
Daniel Borkmannbb333812013-06-28 19:49:40 +0200512 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
515/* For v4, the source address is cached in the route entry(dst). So no need
516 * to cache it separately and hence this is an empty routine.
517 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900518static void sctp_v4_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000519 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000520 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000522 union sctp_addr *saddr = &t->saddr;
523 struct rtable *rt = (struct rtable *)t->dst;
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (rt) {
526 saddr->v4.sin_family = AF_INET;
David S. Miller902ebd32011-05-09 14:49:13 -0700527 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529}
530
531/* What interface did this skb arrive on? */
532static int sctp_v4_skb_iif(const struct sk_buff *skb)
533{
David S. Miller92101b32012-07-23 16:29:00 -0700534 return inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
537/* Was this packet marked by Explicit Congestion Notification? */
538static int sctp_v4_is_ce(const struct sk_buff *skb)
539{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700540 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
543/* Create and initialize a new sk for the socket returned by accept(). */
544static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
545 struct sctp_association *asoc)
546{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900547 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700548 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000549 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 if (!newsk)
552 goto out;
553
554 sock_init_data(NULL, newsk);
555
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000556 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 sock_reset_flag(newsk, SOCK_ZAPPED);
558
559 newinet = inet_sk(newsk);
560
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000561 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700563 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 if (newsk->sk_prot->init(newsk)) {
566 sk_common_release(newsk);
567 newsk = NULL;
568 }
569
570out:
571 return newsk;
572}
573
574/* Map address, empty for v4 family */
575static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
576{
577 /* Empty */
578}
579
580/* Dump the v4 addr to the seq file. */
581static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
582{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700583 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700586static void sctp_v4_ecn_capable(struct sock *sk)
587{
588 INET_ECN_xmit(sk);
589}
590
stephen hemmingerbd2a13e2012-12-28 18:18:55 +0000591static void sctp_addr_wq_timeout_handler(unsigned long arg)
Michio Honda9f7d6532011-04-26 19:32:51 +0900592{
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000593 struct net *net = (struct net *)arg;
Michio Honda9f7d6532011-04-26 19:32:51 +0900594 struct sctp_sockaddr_entry *addrw, *temp;
595 struct sctp_sock *sp;
596
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000597 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900598
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000599 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200600 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
601 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
602 addrw->state, addrw);
Michio Honda9f7d6532011-04-26 19:32:51 +0900603
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000604#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900605 /* Now we send an ASCONF for each association */
606 /* Note. we currently don't handle link local IPv6 addressees */
607 if (addrw->a.sa.sa_family == AF_INET6) {
608 struct in6_addr *in6;
609
610 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
611 IPV6_ADDR_LINKLOCAL)
612 goto free_next;
613
614 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000615 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
Michio Honda9f7d6532011-04-26 19:32:51 +0900616 addrw->state == SCTP_ADDR_NEW) {
617 unsigned long timeo_val;
618
Daniel Borkmannbb333812013-06-28 19:49:40 +0200619 pr_debug("%s: this is on DAD, trying %d sec "
620 "later\n", __func__,
621 SCTP_ADDRESS_TICK_DELAY);
622
Michio Honda9f7d6532011-04-26 19:32:51 +0900623 timeo_val = jiffies;
624 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000625 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900626 break;
627 }
628 }
David S. Miller5d0c90c2011-06-06 13:05:55 -0700629#endif
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000630 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900631 struct sock *sk;
632
633 sk = sctp_opt2sk(sp);
634 /* ignore bound-specific endpoints */
635 if (!sctp_is_ep_boundall(sk))
636 continue;
wangweidong5bc1d1b2014-01-21 15:44:12 +0800637 bh_lock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900638 if (sctp_asconf_mgmt(sp, addrw) < 0)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200639 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
wangweidong5bc1d1b2014-01-21 15:44:12 +0800640 bh_unlock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900641 }
Daniel Halperin39d84a52012-06-18 11:04:55 +0000642#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900643free_next:
Daniel Halperin39d84a52012-06-18 11:04:55 +0000644#endif
Michio Honda9f7d6532011-04-26 19:32:51 +0900645 list_del(&addrw->list);
646 kfree(addrw);
647 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000648 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900649}
650
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000651static void sctp_free_addr_wq(struct net *net)
Michio Honda9f7d6532011-04-26 19:32:51 +0900652{
653 struct sctp_sockaddr_entry *addrw;
654 struct sctp_sockaddr_entry *temp;
655
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000656 spin_lock_bh(&net->sctp.addr_wq_lock);
657 del_timer(&net->sctp.addr_wq_timer);
658 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900659 list_del(&addrw->list);
660 kfree(addrw);
661 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000662 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900663}
664
665/* lookup the entry for the same address in the addr_waitq
666 * sctp_addr_wq MUST be locked
667 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000668static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
669 struct sctp_sockaddr_entry *addr)
Michio Honda9f7d6532011-04-26 19:32:51 +0900670{
671 struct sctp_sockaddr_entry *addrw;
672
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000673 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900674 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
675 continue;
676 if (addrw->a.sa.sa_family == AF_INET) {
677 if (addrw->a.v4.sin_addr.s_addr ==
678 addr->a.v4.sin_addr.s_addr)
679 return addrw;
680 } else if (addrw->a.sa.sa_family == AF_INET6) {
681 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
682 &addr->a.v6.sin6_addr))
683 return addrw;
684 }
685 }
686 return NULL;
687}
688
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000689void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
Michio Honda9f7d6532011-04-26 19:32:51 +0900690{
691 struct sctp_sockaddr_entry *addrw;
692 unsigned long timeo_val;
693
694 /* first, we check if an opposite message already exist in the queue.
695 * If we found such message, it is removed.
696 * This operation is a bit stupid, but the DHCP client attaches the
697 * new address after a couple of addition and deletion of that address
698 */
699
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000700 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900701 /* Offsets existing events in addr_wq */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000702 addrw = sctp_addr_wq_lookup(net, addr);
Michio Honda9f7d6532011-04-26 19:32:51 +0900703 if (addrw) {
704 if (addrw->state != cmd) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200705 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
706 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
707 &net->sctp.addr_waitq);
708
Michio Honda9f7d6532011-04-26 19:32:51 +0900709 list_del(&addrw->list);
710 kfree(addrw);
711 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000712 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900713 return;
714 }
715
716 /* OK, we have to add the new address to the wait queue */
717 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
718 if (addrw == NULL) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000719 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900720 return;
721 }
722 addrw->state = cmd;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000723 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200724
725 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
726 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900727
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000728 if (!timer_pending(&net->sctp.addr_wq_timer)) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900729 timeo_val = jiffies;
730 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000731 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900732 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000733 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900734}
735
Vlad Yasevich29303542007-09-16 16:02:12 -0700736/* Event handler for inet address addition/deletion events.
737 * The sctp_local_addr_list needs to be protocted by a spin lock since
738 * multiple notifiers (say IPv4 and IPv6) may be running at the same
739 * time and thus corrupt the list.
740 * The reader side is protected with RCU.
741 */
Adrian Bunk24123182006-12-20 16:08:22 -0800742static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
743 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800745 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700746 struct sctp_sockaddr_entry *addr = NULL;
747 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000748 struct net *net = dev_net(ifa->ifa_dev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700749 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800751 switch (ev) {
752 case NETDEV_UP:
753 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
754 if (addr) {
755 addr->a.v4.sin_family = AF_INET;
756 addr->a.v4.sin_port = 0;
757 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700758 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000759 spin_lock_bh(&net->sctp.local_addr_lock);
760 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
761 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
762 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800763 }
764 break;
765 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000766 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700767 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000768 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700769 if (addr->a.sa.sa_family == AF_INET &&
770 addr->a.v4.sin_addr.s_addr ==
771 ifa->ifa_local) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000772 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700773 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700774 addr->valid = 0;
775 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800776 break;
777 }
778 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000779 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700780 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800781 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800782 break;
783 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 return NOTIFY_DONE;
786}
787
788/*
789 * Initialize the control inode/socket with a control endpoint data
790 * structure. This endpoint is reserved exclusively for the OOTB processing.
791 */
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000792static int sctp_ctl_sock_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
794 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800795 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797 if (sctp_get_pf_specific(PF_INET6))
798 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000800 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
801 SOCK_SEQPACKET, IPPROTO_SCTP, net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800802
803 /* If IPv6 socket could not be created, try the IPv4 socket */
804 if (err < 0 && family == PF_INET6)
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000805 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800806 SOCK_SEQPACKET, IPPROTO_SCTP,
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000807 net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800808
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000810 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 return err;
812 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 return 0;
814}
815
816/* Register address family specific functions. */
817int sctp_register_af(struct sctp_af *af)
818{
819 switch (af->sa_family) {
820 case AF_INET:
821 if (sctp_af_v4_specific)
822 return 0;
823 sctp_af_v4_specific = af;
824 break;
825 case AF_INET6:
826 if (sctp_af_v6_specific)
827 return 0;
828 sctp_af_v6_specific = af;
829 break;
830 default:
831 return 0;
832 }
833
834 INIT_LIST_HEAD(&af->list);
835 list_add_tail(&af->list, &sctp_address_families);
836 return 1;
837}
838
839/* Get the table of functions for manipulating a particular address
840 * family.
841 */
842struct sctp_af *sctp_get_af_specific(sa_family_t family)
843{
844 switch (family) {
845 case AF_INET:
846 return sctp_af_v4_specific;
847 case AF_INET6:
848 return sctp_af_v6_specific;
849 default:
850 return NULL;
851 }
852}
853
854/* Common code to initialize a AF_INET msg_name. */
855static void sctp_inet_msgname(char *msgname, int *addr_len)
856{
857 struct sockaddr_in *sin;
858
859 sin = (struct sockaddr_in *)msgname;
860 *addr_len = sizeof(struct sockaddr_in);
861 sin->sin_family = AF_INET;
862 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
863}
864
865/* Copy the primary address of the peer primary address as the msg_name. */
866static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
867 int *addr_len)
868{
869 struct sockaddr_in *sin, *sinfrom;
870
871 if (msgname) {
872 struct sctp_association *asoc;
873
874 asoc = event->asoc;
875 sctp_inet_msgname(msgname, addr_len);
876 sin = (struct sockaddr_in *)msgname;
877 sinfrom = &asoc->peer.primary_addr.v4;
878 sin->sin_port = htons(asoc->peer.port);
879 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
880 }
881}
882
883/* Initialize and copy out a msgname from an inbound skb. */
884static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
885{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300887 struct sctphdr *sh = sctp_hdr(skb);
888 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700892 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 }
894}
895
896/* Do we support this AF? */
897static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
898{
899 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000900 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901}
902
903/* Address matching with wildcards allowed. */
904static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
905 const union sctp_addr *addr2,
906 struct sctp_sock *opt)
907{
908 /* PF_INET only supports AF_INET addresses. */
909 if (addr1->sa.sa_family != addr2->sa.sa_family)
910 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700911 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
912 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 return 1;
914 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
915 return 1;
916
917 return 0;
918}
919
920/* Verify that provided sockaddr looks bindable. Common verification has
921 * already been taken care of.
922 */
923static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
924{
925 return sctp_v4_available(addr, opt);
926}
927
928/* Verify that sockaddr looks sendable. Common verification has already
929 * been taken care of.
930 */
931static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
932{
933 return 1;
934}
935
936/* Fill in Supported Address Type information for INIT and INIT-ACK
937 * chunks. Returns number of addresses supported.
938 */
939static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800940 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941{
942 types[0] = SCTP_PARAM_IPV4_ADDRESS;
943 return 1;
944}
945
946/* Wrapper routine that calls the ip transmit routine. */
947static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700948 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
Herbert Xuf8803742008-08-03 21:15:08 -0700950 struct inet_sock *inet = inet_sk(skb->sk);
951
Daniel Borkmannbb333812013-06-28 19:49:40 +0200952 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
953 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Herbert Xuf8803742008-08-03 21:15:08 -0700955 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
956 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
957
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000958 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200959
David S. Millerd9d8da82011-05-06 22:23:20 -0700960 return ip_queue_xmit(skb, &transport->fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
962
Neil Horman15efbe72008-02-15 09:53:59 -0500963static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
965static struct sctp_pf sctp_pf_inet = {
966 .event_msgname = sctp_inet_event_msgname,
967 .skb_msgname = sctp_inet_skb_msgname,
968 .af_supported = sctp_inet_af_supported,
969 .cmp_addr = sctp_inet_cmp_addr,
970 .bind_verify = sctp_inet_bind_verify,
971 .send_verify = sctp_inet_send_verify,
972 .supported_addrs = sctp_inet_supported_addrs,
973 .create_accept_sk = sctp_v4_create_accept_sk,
974 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500975 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976};
977
978/* Notifier for inetaddr addition/deletion events. */
979static struct notifier_block sctp_inetaddr_notifier = {
980 .notifier_call = sctp_inetaddr_event,
981};
982
983/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800984static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800985 .family = PF_INET,
986 .owner = THIS_MODULE,
987 .release = inet_release, /* Needs to be wrapped... */
988 .bind = inet_bind,
989 .connect = inet_dgram_connect,
990 .socketpair = sock_no_socketpair,
991 .accept = inet_accept,
992 .getname = inet_getname, /* Semantics are different. */
993 .poll = sctp_poll,
994 .ioctl = inet_ioctl,
995 .listen = sctp_inet_listen,
996 .shutdown = inet_shutdown, /* Looks harmless. */
997 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
998 .getsockopt = sock_common_getsockopt,
999 .sendmsg = inet_sendmsg,
1000 .recvmsg = sock_common_recvmsg,
1001 .mmap = sock_no_mmap,
1002 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001003#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001004 .compat_setsockopt = compat_sock_common_setsockopt,
1005 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001006#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007};
1008
1009/* Registration with AF_INET family. */
1010static struct inet_protosw sctp_seqpacket_protosw = {
1011 .type = SOCK_SEQPACKET,
1012 .protocol = IPPROTO_SCTP,
1013 .prot = &sctp_prot,
1014 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 .no_check = 0,
1016 .flags = SCTP_PROTOSW_FLAG
1017};
1018static struct inet_protosw sctp_stream_protosw = {
1019 .type = SOCK_STREAM,
1020 .protocol = IPPROTO_SCTP,
1021 .prot = &sctp_prot,
1022 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 .no_check = 0,
1024 .flags = SCTP_PROTOSW_FLAG
1025};
1026
1027/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +00001028static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 .handler = sctp_rcv,
1030 .err_handler = sctp_v4_err,
1031 .no_policy = 1,
Eric W. Biedermanbb2db452012-08-06 08:46:26 +00001032 .netns_ok = 1,
Hannes Frederic Sowa8ed1dc42014-01-09 10:01:17 +01001033 .icmp_strict_tag_validation = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034};
1035
1036/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001037static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001038 .sa_family = AF_INET,
1039 .sctp_xmit = sctp_v4_xmit,
1040 .setsockopt = ip_setsockopt,
1041 .getsockopt = ip_getsockopt,
1042 .get_dst = sctp_v4_get_dst,
1043 .get_saddr = sctp_v4_get_saddr,
1044 .copy_addrlist = sctp_v4_copy_addrlist,
1045 .from_skb = sctp_v4_from_skb,
1046 .from_sk = sctp_v4_from_sk,
1047 .to_sk_saddr = sctp_v4_to_sk_saddr,
1048 .to_sk_daddr = sctp_v4_to_sk_daddr,
1049 .from_addr_param = sctp_v4_from_addr_param,
1050 .to_addr_param = sctp_v4_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001051 .cmp_addr = sctp_v4_cmp_addr,
1052 .addr_valid = sctp_v4_addr_valid,
1053 .inaddr_any = sctp_v4_inaddr_any,
1054 .is_any = sctp_v4_is_any,
1055 .available = sctp_v4_available,
1056 .scope = sctp_v4_scope,
1057 .skb_iif = sctp_v4_skb_iif,
1058 .is_ce = sctp_v4_is_ce,
1059 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001060 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001061 .net_header_len = sizeof(struct iphdr),
1062 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001063#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001064 .compat_setsockopt = compat_ip_setsockopt,
1065 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001066#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067};
1068
wangweidong8d726512013-12-23 12:16:53 +08001069struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1070{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 switch (family) {
1072 case PF_INET:
1073 return sctp_pf_inet_specific;
1074 case PF_INET6:
1075 return sctp_pf_inet6_specific;
1076 default:
1077 return NULL;
1078 }
1079}
1080
1081/* Register the PF specific function table. */
1082int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1083{
1084 switch (family) {
1085 case PF_INET:
1086 if (sctp_pf_inet_specific)
1087 return 0;
1088 sctp_pf_inet_specific = pf;
1089 break;
1090 case PF_INET6:
1091 if (sctp_pf_inet6_specific)
1092 return 0;
1093 sctp_pf_inet6_specific = pf;
1094 break;
1095 default:
1096 return 0;
1097 }
1098 return 1;
1099}
1100
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001101static inline int init_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001103 return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001104 sizeof(struct sctp_mib),
1105 __alignof__(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001108static inline void cleanup_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001110 snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111}
1112
Vlad Yasevich270637a2008-03-20 15:17:14 -07001113static void sctp_v4_pf_init(void)
1114{
1115 /* Initialize the SCTP specific PF functions. */
1116 sctp_register_pf(&sctp_pf_inet, PF_INET);
1117 sctp_register_af(&sctp_af_inet);
1118}
1119
1120static void sctp_v4_pf_exit(void)
1121{
1122 list_del(&sctp_af_inet.list);
1123}
1124
1125static int sctp_v4_protosw_init(void)
1126{
1127 int rc;
1128
1129 rc = proto_register(&sctp_prot, 1);
1130 if (rc)
1131 return rc;
1132
1133 /* Register SCTP(UDP and TCP style) with socket layer. */
1134 inet_register_protosw(&sctp_seqpacket_protosw);
1135 inet_register_protosw(&sctp_stream_protosw);
1136
1137 return 0;
1138}
1139
1140static void sctp_v4_protosw_exit(void)
1141{
1142 inet_unregister_protosw(&sctp_stream_protosw);
1143 inet_unregister_protosw(&sctp_seqpacket_protosw);
1144 proto_unregister(&sctp_prot);
1145}
1146
1147static int sctp_v4_add_protocol(void)
1148{
1149 /* Register notifier for inet address additions/deletions. */
1150 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1151
1152 /* Register SCTP with inet layer. */
1153 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1154 return -EAGAIN;
1155
1156 return 0;
1157}
1158
1159static void sctp_v4_del_protocol(void)
1160{
1161 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1162 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1163}
1164
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001165static int __net_init sctp_net_init(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001166{
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001167 int status;
1168
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001169 /*
1170 * 14. Suggested SCTP Protocol Parameter Values
1171 */
1172 /* The following protocol parameters are RECOMMENDED: */
1173 /* RTO.Initial - 3 seconds */
1174 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1175 /* RTO.Min - 1 second */
1176 net->sctp.rto_min = SCTP_RTO_MIN;
1177 /* RTO.Max - 60 seconds */
1178 net->sctp.rto_max = SCTP_RTO_MAX;
1179 /* RTO.Alpha - 1/8 */
1180 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1181 /* RTO.Beta - 1/4 */
1182 net->sctp.rto_beta = SCTP_RTO_BETA;
1183
1184 /* Valid.Cookie.Life - 60 seconds */
1185 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1186
1187 /* Whether Cookie Preservative is enabled(1) or not(0) */
1188 net->sctp.cookie_preserve_enable = 1;
1189
Neil Horman3c681982012-10-24 09:20:03 +00001190 /* Default sctp sockets to use md5 as their hmac alg */
Neil Horman0d0863b2012-12-14 15:22:01 +00001191#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
Neil Horman3c681982012-10-24 09:20:03 +00001192 net->sctp.sctp_hmac_alg = "md5";
Neil Horman0d0863b2012-12-14 15:22:01 +00001193#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
Neil Horman3c681982012-10-24 09:20:03 +00001194 net->sctp.sctp_hmac_alg = "sha1";
1195#else
1196 net->sctp.sctp_hmac_alg = NULL;
1197#endif
1198
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001199 /* Max.Burst - 4 */
1200 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1201
1202 /* Association.Max.Retrans - 10 attempts
1203 * Path.Max.Retrans - 5 attempts (per destination address)
1204 * Max.Init.Retransmits - 8 attempts
1205 */
1206 net->sctp.max_retrans_association = 10;
1207 net->sctp.max_retrans_path = 5;
1208 net->sctp.max_retrans_init = 8;
1209
1210 /* Sendbuffer growth - do per-socket accounting */
1211 net->sctp.sndbuf_policy = 0;
1212
1213 /* Rcvbuffer growth - do per-socket accounting */
1214 net->sctp.rcvbuf_policy = 0;
1215
1216 /* HB.interval - 30 seconds */
1217 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1218
1219 /* delayed SACK timeout */
1220 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1221
1222 /* Disable ADDIP by default. */
1223 net->sctp.addip_enable = 0;
1224 net->sctp.addip_noauth = 0;
1225 net->sctp.default_auto_asconf = 0;
1226
1227 /* Enable PR-SCTP by default. */
1228 net->sctp.prsctp_enable = 1;
1229
1230 /* Disable AUTH by default. */
1231 net->sctp.auth_enable = 0;
1232
1233 /* Set SCOPE policy to enabled */
1234 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1235
1236 /* Set the default rwnd update threshold */
1237 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1238
1239 /* Initialize maximum autoclose timeout. */
1240 net->sctp.max_autoclose = INT_MAX / HZ;
1241
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001242 status = sctp_sysctl_net_register(net);
1243 if (status)
1244 goto err_sysctl_register;
1245
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001246 /* Allocate and initialise sctp mibs. */
1247 status = init_sctp_mibs(net);
1248 if (status)
1249 goto err_init_mibs;
1250
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001251 /* Initialize proc fs directory. */
1252 status = sctp_proc_init(net);
1253 if (status)
1254 goto err_init_proc;
1255
1256 sctp_dbg_objcnt_init(net);
1257
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001258 /* Initialize the control inode/socket for handling OOTB packets. */
1259 if ((status = sctp_ctl_sock_init(net))) {
1260 pr_err("Failed to initialize the SCTP control sock\n");
1261 goto err_ctl_sock_init;
1262 }
1263
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001264 /* Initialize the local address list. */
1265 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1266 spin_lock_init(&net->sctp.local_addr_lock);
1267 sctp_get_local_addr_list(net);
1268
1269 /* Initialize the address event list */
1270 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1271 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1272 spin_lock_init(&net->sctp.addr_wq_lock);
1273 net->sctp.addr_wq_timer.expires = 0;
1274 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1275 (unsigned long)net);
1276
1277 return 0;
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001278
1279err_ctl_sock_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001280 sctp_dbg_objcnt_exit(net);
1281 sctp_proc_exit(net);
1282err_init_proc:
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001283 cleanup_sctp_mibs(net);
1284err_init_mibs:
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001285 sctp_sysctl_net_unregister(net);
1286err_sysctl_register:
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001287 return status;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001288}
1289
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001290static void __net_exit sctp_net_exit(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001291{
1292 /* Free the local address list */
1293 sctp_free_addr_wq(net);
1294 sctp_free_local_addr_list(net);
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001295
1296 /* Free the control endpoint. */
1297 inet_ctl_sock_destroy(net->sctp.ctl_sock);
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001298
1299 sctp_dbg_objcnt_exit(net);
1300
1301 sctp_proc_exit(net);
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001302 cleanup_sctp_mibs(net);
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001303 sctp_sysctl_net_unregister(net);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001304}
1305
1306static struct pernet_operations sctp_net_ops = {
1307 .init = sctp_net_init,
1308 .exit = sctp_net_exit,
1309};
1310
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311/* Initialize the universe into something sensible. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001312static __init int sctp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313{
1314 int i;
1315 int status = -EINVAL;
1316 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001317 unsigned long limit;
1318 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 int order;
1320
Daniel Borkmannbb333812013-06-28 19:49:40 +02001321 BUILD_BUG_ON(sizeof(struct sctp_ulpevent) >
1322 sizeof(((struct sk_buff *) 0)->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001324 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 status = -ENOBUFS;
1326 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1327 sizeof(struct sctp_bind_bucket),
1328 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001329 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001331 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
1333 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1334 sizeof(struct sctp_chunk),
1335 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001336 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 if (!sctp_chunk_cachep)
1338 goto err_chunk_cachep;
1339
Eric W. Biederman632c9282012-08-06 08:44:24 +00001340 status = percpu_counter_init(&sctp_sockets_allocated, 0);
1341 if (status)
1342 goto err_percpu_counter_init;
1343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 /* Implementation specific variables. */
1345
1346 /* Initialize default stream count setup information. */
1347 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1348 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1349
1350 /* Initialize handle used for association ids. */
1351 idr_init(&sctp_assocs_id);
1352
Eric Dumazetf03d78d2011-07-07 00:27:05 -07001353 limit = nr_free_buffer_pages() / 8;
Neil Horman4d93df02007-08-15 16:07:44 -07001354 limit = max(limit, 128UL);
1355 sysctl_sctp_mem[0] = limit / 4 * 3;
1356 sysctl_sctp_mem[1] = limit;
1357 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1358
1359 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1360 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1361 max_share = min(4UL*1024*1024, limit);
1362
Vlad Yasevich845525a2008-07-18 23:08:21 -07001363 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001364 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
Neil Horman4d93df02007-08-15 16:07:44 -07001365 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1366
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001367 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001368 sysctl_sctp_wmem[1] = 16*1024;
1369 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1370
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 /* Size and allocate the association hash table.
1372 * The methodology is similar to that of the tcp hash tables.
1373 */
Jan Beulich44813742009-09-21 17:03:05 -07001374 if (totalram_pages >= (128 * 1024))
1375 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 else
Jan Beulich44813742009-09-21 17:03:05 -07001377 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
1379 for (order = 0; (1UL << order) < goal; order++)
1380 ;
1381
1382 do {
1383 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1384 sizeof(struct sctp_hashbucket);
1385 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1386 continue;
1387 sctp_assoc_hashtable = (struct sctp_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001388 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 } while (!sctp_assoc_hashtable && --order > 0);
1390 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001391 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 status = -ENOMEM;
1393 goto err_ahash_alloc;
1394 }
1395 for (i = 0; i < sctp_assoc_hashsize; i++) {
1396 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001397 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 }
1399
1400 /* Allocate and initialize the endpoint hash table. */
1401 sctp_ep_hashsize = 64;
Zhang Yanfei3b77d662013-03-12 13:39:47 +08001402 sctp_ep_hashtable =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1404 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001405 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 status = -ENOMEM;
1407 goto err_ehash_alloc;
1408 }
1409 for (i = 0; i < sctp_ep_hashsize; i++) {
1410 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001411 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 }
1413
1414 /* Allocate and initialize the SCTP port hash table. */
1415 do {
1416 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1417 sizeof(struct sctp_bind_hashbucket);
1418 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1419 continue;
1420 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001421 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 } while (!sctp_port_hashtable && --order > 0);
1423 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001424 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 status = -ENOMEM;
1426 goto err_bhash_alloc;
1427 }
1428 for (i = 0; i < sctp_port_hashsize; i++) {
1429 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001430 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
1432
Joe Perches145ce502010-08-24 13:21:08 +00001433 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 sctp_assoc_hashsize, sctp_port_hashsize);
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 sctp_sysctl_register();
1437
1438 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001439 sctp_v4_pf_init();
1440 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Vlad Yasevich270637a2008-03-20 15:17:14 -07001442 status = sctp_v4_protosw_init();
1443
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001444 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001445 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001446
Vlad Yasevich270637a2008-03-20 15:17:14 -07001447 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001449 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001451 status = register_pernet_subsys(&sctp_net_ops);
1452 if (status)
1453 goto err_register_pernet_subsys;
1454
Vlad Yasevich270637a2008-03-20 15:17:14 -07001455 status = sctp_v4_add_protocol();
1456 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001457 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001458
1459 /* Register SCTP with inet6 layer. */
1460 status = sctp_v6_add_protocol();
1461 if (status)
1462 goto err_v6_add_protocol;
1463
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464out:
1465 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001466err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001467 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001468err_add_protocol:
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001469 unregister_pernet_subsys(&sctp_net_ops);
1470err_register_pernet_subsys:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001471 sctp_v6_protosw_exit();
1472err_v6_protosw_init:
1473 sctp_v4_protosw_exit();
1474err_protosw_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001475 sctp_v4_pf_exit();
1476 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 free_pages((unsigned long)sctp_port_hashtable,
1479 get_order(sctp_port_hashsize *
1480 sizeof(struct sctp_bind_hashbucket)));
1481err_bhash_alloc:
1482 kfree(sctp_ep_hashtable);
1483err_ehash_alloc:
1484 free_pages((unsigned long)sctp_assoc_hashtable,
1485 get_order(sctp_assoc_hashsize *
1486 sizeof(struct sctp_hashbucket)));
1487err_ahash_alloc:
Eric W. Biederman632c9282012-08-06 08:44:24 +00001488 percpu_counter_destroy(&sctp_sockets_allocated);
1489err_percpu_counter_init:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 kmem_cache_destroy(sctp_chunk_cachep);
1491err_chunk_cachep:
1492 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 goto out;
1494}
1495
1496/* Exit handler for the SCTP protocol. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001497static __exit void sctp_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498{
1499 /* BUG. This should probably do something useful like clean
1500 * up all the remaining associations and all that memory.
1501 */
1502
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001503 /* Unregister with inet6/inet layers. */
1504 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001505 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001507 unregister_pernet_subsys(&sctp_net_ops);
1508
Vlad Yasevich270637a2008-03-20 15:17:14 -07001509 /* Free protosw registrations */
1510 sctp_v6_protosw_exit();
1511 sctp_v4_protosw_exit();
1512
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001513 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001514 sctp_v6_pf_exit();
1515 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
1519 free_pages((unsigned long)sctp_assoc_hashtable,
1520 get_order(sctp_assoc_hashsize *
1521 sizeof(struct sctp_hashbucket)));
1522 kfree(sctp_ep_hashtable);
1523 free_pages((unsigned long)sctp_port_hashtable,
1524 get_order(sctp_port_hashsize *
1525 sizeof(struct sctp_bind_hashbucket)));
1526
Eric W. Biederman632c9282012-08-06 08:44:24 +00001527 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001529 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1530
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001531 kmem_cache_destroy(sctp_chunk_cachep);
1532 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533}
1534
1535module_init(sctp_init);
1536module_exit(sctp_exit);
1537
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001538/*
1539 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1540 */
1541MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001542MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Daniel Borkmann91705c62013-07-23 14:51:47 +02001543MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
David S. Miller71acc0d2013-08-09 13:09:41 -07001545module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1546MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547MODULE_LICENSE("GPL");