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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 &&
Vincent Bernat49a60152014-09-05 15:09:03 +0200369 !net->ipv4.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->fl4_sport = laddr->a.v4.sin_port;
Xufeng Zhang85350872014-04-25 16:55:41 +0800495 flowi4_update_output(fl4,
496 asoc->base.sk->sk_bound_dev_if,
497 RT_CONN_FLAGS(asoc->base.sk),
498 daddr->v4.sin_addr.s_addr,
499 laddr->a.v4.sin_addr.s_addr);
500
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000501 rt = ip_route_output_key(sock_net(sk), fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800502 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700503 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 goto out_unlock;
505 }
506 }
507 }
508
509out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700510 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511out:
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000512 t->dst = dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 if (dst)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200514 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
515 &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 else
Daniel Borkmannbb333812013-06-28 19:49:40 +0200517 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520/* For v4, the source address is cached in the route entry(dst). So no need
521 * to cache it separately and hence this is an empty routine.
522 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900523static void sctp_v4_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000524 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000525 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000527 union sctp_addr *saddr = &t->saddr;
528 struct rtable *rt = (struct rtable *)t->dst;
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (rt) {
531 saddr->v4.sin_family = AF_INET;
David S. Miller902ebd32011-05-09 14:49:13 -0700532 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
534}
535
536/* What interface did this skb arrive on? */
537static int sctp_v4_skb_iif(const struct sk_buff *skb)
538{
David S. Miller92101b32012-07-23 16:29:00 -0700539 return inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
541
542/* Was this packet marked by Explicit Congestion Notification? */
543static int sctp_v4_is_ce(const struct sk_buff *skb)
544{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700545 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546}
547
548/* Create and initialize a new sk for the socket returned by accept(). */
549static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
550 struct sctp_association *asoc)
551{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900552 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700553 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000554 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 if (!newsk)
557 goto out;
558
559 sock_init_data(NULL, newsk);
560
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000561 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 sock_reset_flag(newsk, SOCK_ZAPPED);
563
564 newinet = inet_sk(newsk);
565
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000566 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700568 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 if (newsk->sk_prot->init(newsk)) {
571 sk_common_release(newsk);
572 newsk = NULL;
573 }
574
575out:
576 return newsk;
577}
578
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600579static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600581 /* No address mapping for V4 sockets */
582 return sizeof(struct sockaddr_in);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
584
585/* Dump the v4 addr to the seq file. */
586static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
587{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700588 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700591static void sctp_v4_ecn_capable(struct sock *sk)
592{
593 INET_ECN_xmit(sk);
594}
595
stephen hemmingerbd2a13e2012-12-28 18:18:55 +0000596static void sctp_addr_wq_timeout_handler(unsigned long arg)
Michio Honda9f7d6532011-04-26 19:32:51 +0900597{
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000598 struct net *net = (struct net *)arg;
Michio Honda9f7d6532011-04-26 19:32:51 +0900599 struct sctp_sockaddr_entry *addrw, *temp;
600 struct sctp_sock *sp;
601
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000602 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900603
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000604 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200605 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
606 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
607 addrw->state, addrw);
Michio Honda9f7d6532011-04-26 19:32:51 +0900608
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000609#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900610 /* Now we send an ASCONF for each association */
611 /* Note. we currently don't handle link local IPv6 addressees */
612 if (addrw->a.sa.sa_family == AF_INET6) {
613 struct in6_addr *in6;
614
615 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
616 IPV6_ADDR_LINKLOCAL)
617 goto free_next;
618
619 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000620 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
Michio Honda9f7d6532011-04-26 19:32:51 +0900621 addrw->state == SCTP_ADDR_NEW) {
622 unsigned long timeo_val;
623
Daniel Borkmannbb333812013-06-28 19:49:40 +0200624 pr_debug("%s: this is on DAD, trying %d sec "
625 "later\n", __func__,
626 SCTP_ADDRESS_TICK_DELAY);
627
Michio Honda9f7d6532011-04-26 19:32:51 +0900628 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;
wangweidong5bc1d1b2014-01-21 15:44:12 +0800642 bh_lock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900643 if (sctp_asconf_mgmt(sp, addrw) < 0)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200644 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
wangweidong5bc1d1b2014-01-21 15:44:12 +0800645 bh_unlock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900646 }
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) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200710 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
711 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
712 &net->sctp.addr_waitq);
713
Michio Honda9f7d6532011-04-26 19:32:51 +0900714 list_del(&addrw->list);
715 kfree(addrw);
716 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000717 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900718 return;
719 }
720
721 /* OK, we have to add the new address to the wait queue */
722 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
723 if (addrw == NULL) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000724 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900725 return;
726 }
727 addrw->state = cmd;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000728 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200729
730 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
731 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900732
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000733 if (!timer_pending(&net->sctp.addr_wq_timer)) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900734 timeo_val = jiffies;
735 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000736 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900737 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000738 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900739}
740
Vlad Yasevich29303542007-09-16 16:02:12 -0700741/* Event handler for inet address addition/deletion events.
742 * The sctp_local_addr_list needs to be protocted by a spin lock since
743 * multiple notifiers (say IPv4 and IPv6) may be running at the same
744 * time and thus corrupt the list.
745 * The reader side is protected with RCU.
746 */
Adrian Bunk24123182006-12-20 16:08:22 -0800747static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
748 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800750 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700751 struct sctp_sockaddr_entry *addr = NULL;
752 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000753 struct net *net = dev_net(ifa->ifa_dev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700754 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800756 switch (ev) {
757 case NETDEV_UP:
758 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
759 if (addr) {
760 addr->a.v4.sin_family = AF_INET;
761 addr->a.v4.sin_port = 0;
762 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700763 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000764 spin_lock_bh(&net->sctp.local_addr_lock);
765 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
766 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
767 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800768 }
769 break;
770 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000771 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700772 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000773 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700774 if (addr->a.sa.sa_family == AF_INET &&
775 addr->a.v4.sin_addr.s_addr ==
776 ifa->ifa_local) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000777 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700778 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700779 addr->valid = 0;
780 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800781 break;
782 }
783 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000784 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700785 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800786 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800787 break;
788 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
790 return NOTIFY_DONE;
791}
792
793/*
794 * Initialize the control inode/socket with a control endpoint data
795 * structure. This endpoint is reserved exclusively for the OOTB processing.
796 */
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000797static int sctp_ctl_sock_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
799 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800800 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802 if (sctp_get_pf_specific(PF_INET6))
803 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000805 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
806 SOCK_SEQPACKET, IPPROTO_SCTP, net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800807
808 /* If IPv6 socket could not be created, try the IPv4 socket */
809 if (err < 0 && family == PF_INET6)
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000810 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800811 SOCK_SEQPACKET, IPPROTO_SCTP,
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000812 net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000815 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 return err;
817 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 return 0;
819}
820
821/* Register address family specific functions. */
822int sctp_register_af(struct sctp_af *af)
823{
824 switch (af->sa_family) {
825 case AF_INET:
826 if (sctp_af_v4_specific)
827 return 0;
828 sctp_af_v4_specific = af;
829 break;
830 case AF_INET6:
831 if (sctp_af_v6_specific)
832 return 0;
833 sctp_af_v6_specific = af;
834 break;
835 default:
836 return 0;
837 }
838
839 INIT_LIST_HEAD(&af->list);
840 list_add_tail(&af->list, &sctp_address_families);
841 return 1;
842}
843
844/* Get the table of functions for manipulating a particular address
845 * family.
846 */
847struct sctp_af *sctp_get_af_specific(sa_family_t family)
848{
849 switch (family) {
850 case AF_INET:
851 return sctp_af_v4_specific;
852 case AF_INET6:
853 return sctp_af_v6_specific;
854 default:
855 return NULL;
856 }
857}
858
859/* Common code to initialize a AF_INET msg_name. */
860static void sctp_inet_msgname(char *msgname, int *addr_len)
861{
862 struct sockaddr_in *sin;
863
864 sin = (struct sockaddr_in *)msgname;
865 *addr_len = sizeof(struct sockaddr_in);
866 sin->sin_family = AF_INET;
867 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
868}
869
870/* Copy the primary address of the peer primary address as the msg_name. */
871static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
872 int *addr_len)
873{
874 struct sockaddr_in *sin, *sinfrom;
875
876 if (msgname) {
877 struct sctp_association *asoc;
878
879 asoc = event->asoc;
880 sctp_inet_msgname(msgname, addr_len);
881 sin = (struct sockaddr_in *)msgname;
882 sinfrom = &asoc->peer.primary_addr.v4;
883 sin->sin_port = htons(asoc->peer.port);
884 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
885 }
886}
887
888/* Initialize and copy out a msgname from an inbound skb. */
889static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
890{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300892 struct sctphdr *sh = sctp_hdr(skb);
893 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700897 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 }
899}
900
901/* Do we support this AF? */
902static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
903{
904 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000905 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
907
908/* Address matching with wildcards allowed. */
909static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
910 const union sctp_addr *addr2,
911 struct sctp_sock *opt)
912{
913 /* PF_INET only supports AF_INET addresses. */
914 if (addr1->sa.sa_family != addr2->sa.sa_family)
915 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700916 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
917 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 return 1;
919 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
920 return 1;
921
922 return 0;
923}
924
925/* Verify that provided sockaddr looks bindable. Common verification has
926 * already been taken care of.
927 */
928static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
929{
930 return sctp_v4_available(addr, opt);
931}
932
933/* Verify that sockaddr looks sendable. Common verification has already
934 * been taken care of.
935 */
936static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
937{
938 return 1;
939}
940
941/* Fill in Supported Address Type information for INIT and INIT-ACK
942 * chunks. Returns number of addresses supported.
943 */
944static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800945 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946{
947 types[0] = SCTP_PARAM_IPV4_ADDRESS;
948 return 1;
949}
950
951/* Wrapper routine that calls the ip transmit routine. */
952static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700953 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954{
Herbert Xuf8803742008-08-03 21:15:08 -0700955 struct inet_sock *inet = inet_sk(skb->sk);
956
Daniel Borkmannbb333812013-06-28 19:49:40 +0200957 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
958 skb->len, &transport->fl.u.ip4.saddr, &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);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200964
Eric Dumazetb0270e92014-04-15 12:58:34 -0400965 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966}
967
Neil Horman15efbe72008-02-15 09:53:59 -0500968static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970static struct sctp_pf sctp_pf_inet = {
971 .event_msgname = sctp_inet_event_msgname,
972 .skb_msgname = sctp_inet_skb_msgname,
973 .af_supported = sctp_inet_af_supported,
974 .cmp_addr = sctp_inet_cmp_addr,
975 .bind_verify = sctp_inet_bind_verify,
976 .send_verify = sctp_inet_send_verify,
977 .supported_addrs = sctp_inet_supported_addrs,
978 .create_accept_sk = sctp_v4_create_accept_sk,
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600979 .addr_to_user = sctp_v4_addr_to_user,
980 .to_sk_saddr = sctp_v4_to_sk_saddr,
981 .to_sk_daddr = sctp_v4_to_sk_daddr,
Neil Horman15efbe72008-02-15 09:53:59 -0500982 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983};
984
985/* Notifier for inetaddr addition/deletion events. */
986static struct notifier_block sctp_inetaddr_notifier = {
987 .notifier_call = sctp_inetaddr_event,
988};
989
990/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800991static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800992 .family = PF_INET,
993 .owner = THIS_MODULE,
994 .release = inet_release, /* Needs to be wrapped... */
995 .bind = inet_bind,
996 .connect = inet_dgram_connect,
997 .socketpair = sock_no_socketpair,
998 .accept = inet_accept,
999 .getname = inet_getname, /* Semantics are different. */
1000 .poll = sctp_poll,
1001 .ioctl = inet_ioctl,
1002 .listen = sctp_inet_listen,
1003 .shutdown = inet_shutdown, /* Looks harmless. */
1004 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1005 .getsockopt = sock_common_getsockopt,
1006 .sendmsg = inet_sendmsg,
1007 .recvmsg = sock_common_recvmsg,
1008 .mmap = sock_no_mmap,
1009 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001010#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001011 .compat_setsockopt = compat_sock_common_setsockopt,
1012 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001013#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014};
1015
1016/* Registration with AF_INET family. */
1017static struct inet_protosw sctp_seqpacket_protosw = {
1018 .type = SOCK_SEQPACKET,
1019 .protocol = IPPROTO_SCTP,
1020 .prot = &sctp_prot,
1021 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 .flags = SCTP_PROTOSW_FLAG
1023};
1024static struct inet_protosw sctp_stream_protosw = {
1025 .type = SOCK_STREAM,
1026 .protocol = IPPROTO_SCTP,
1027 .prot = &sctp_prot,
1028 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 .flags = SCTP_PROTOSW_FLAG
1030};
1031
1032/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +00001033static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 .handler = sctp_rcv,
1035 .err_handler = sctp_v4_err,
1036 .no_policy = 1,
Eric W. Biedermanbb2db452012-08-06 08:46:26 +00001037 .netns_ok = 1,
Hannes Frederic Sowa8ed1dc42014-01-09 10:01:17 +01001038 .icmp_strict_tag_validation = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039};
1040
1041/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001042static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001043 .sa_family = AF_INET,
1044 .sctp_xmit = sctp_v4_xmit,
1045 .setsockopt = ip_setsockopt,
1046 .getsockopt = ip_getsockopt,
1047 .get_dst = sctp_v4_get_dst,
1048 .get_saddr = sctp_v4_get_saddr,
1049 .copy_addrlist = sctp_v4_copy_addrlist,
1050 .from_skb = sctp_v4_from_skb,
1051 .from_sk = sctp_v4_from_sk,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001052 .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
wangweidong8d726512013-12-23 12:16:53 +08001072struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1073{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 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{
WANG Cong698365f2014-05-05 15:55:55 -07001106 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1107 if (!net->sctp.sctp_statistics)
1108 return -ENOMEM;
1109 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110}
1111
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001112static inline void cleanup_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113{
WANG Cong698365f2014-05-05 15:55:55 -07001114 free_percpu(net->sctp.sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115}
1116
Vlad Yasevich270637a2008-03-20 15:17:14 -07001117static void sctp_v4_pf_init(void)
1118{
1119 /* Initialize the SCTP specific PF functions. */
1120 sctp_register_pf(&sctp_pf_inet, PF_INET);
1121 sctp_register_af(&sctp_af_inet);
1122}
1123
1124static void sctp_v4_pf_exit(void)
1125{
1126 list_del(&sctp_af_inet.list);
1127}
1128
1129static int sctp_v4_protosw_init(void)
1130{
1131 int rc;
1132
1133 rc = proto_register(&sctp_prot, 1);
1134 if (rc)
1135 return rc;
1136
1137 /* Register SCTP(UDP and TCP style) with socket layer. */
1138 inet_register_protosw(&sctp_seqpacket_protosw);
1139 inet_register_protosw(&sctp_stream_protosw);
1140
1141 return 0;
1142}
1143
1144static void sctp_v4_protosw_exit(void)
1145{
1146 inet_unregister_protosw(&sctp_stream_protosw);
1147 inet_unregister_protosw(&sctp_seqpacket_protosw);
1148 proto_unregister(&sctp_prot);
1149}
1150
1151static int sctp_v4_add_protocol(void)
1152{
1153 /* Register notifier for inet address additions/deletions. */
1154 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1155
1156 /* Register SCTP with inet layer. */
1157 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1158 return -EAGAIN;
1159
1160 return 0;
1161}
1162
1163static void sctp_v4_del_protocol(void)
1164{
1165 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1166 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1167}
1168
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001169static int __net_init sctp_net_init(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001170{
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001171 int status;
1172
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001173 /*
1174 * 14. Suggested SCTP Protocol Parameter Values
1175 */
1176 /* The following protocol parameters are RECOMMENDED: */
1177 /* RTO.Initial - 3 seconds */
1178 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1179 /* RTO.Min - 1 second */
1180 net->sctp.rto_min = SCTP_RTO_MIN;
1181 /* RTO.Max - 60 seconds */
1182 net->sctp.rto_max = SCTP_RTO_MAX;
1183 /* RTO.Alpha - 1/8 */
1184 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1185 /* RTO.Beta - 1/4 */
1186 net->sctp.rto_beta = SCTP_RTO_BETA;
1187
1188 /* Valid.Cookie.Life - 60 seconds */
1189 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1190
1191 /* Whether Cookie Preservative is enabled(1) or not(0) */
1192 net->sctp.cookie_preserve_enable = 1;
1193
Neil Horman3c681982012-10-24 09:20:03 +00001194 /* Default sctp sockets to use md5 as their hmac alg */
Neil Horman0d0863b2012-12-14 15:22:01 +00001195#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
Neil Horman3c681982012-10-24 09:20:03 +00001196 net->sctp.sctp_hmac_alg = "md5";
Neil Horman0d0863b2012-12-14 15:22:01 +00001197#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
Neil Horman3c681982012-10-24 09:20:03 +00001198 net->sctp.sctp_hmac_alg = "sha1";
1199#else
1200 net->sctp.sctp_hmac_alg = NULL;
1201#endif
1202
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001203 /* Max.Burst - 4 */
1204 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1205
1206 /* Association.Max.Retrans - 10 attempts
1207 * Path.Max.Retrans - 5 attempts (per destination address)
1208 * Max.Init.Retransmits - 8 attempts
1209 */
1210 net->sctp.max_retrans_association = 10;
1211 net->sctp.max_retrans_path = 5;
1212 net->sctp.max_retrans_init = 8;
1213
1214 /* Sendbuffer growth - do per-socket accounting */
1215 net->sctp.sndbuf_policy = 0;
1216
1217 /* Rcvbuffer growth - do per-socket accounting */
1218 net->sctp.rcvbuf_policy = 0;
1219
1220 /* HB.interval - 30 seconds */
1221 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1222
1223 /* delayed SACK timeout */
1224 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1225
1226 /* Disable ADDIP by default. */
1227 net->sctp.addip_enable = 0;
1228 net->sctp.addip_noauth = 0;
1229 net->sctp.default_auto_asconf = 0;
1230
1231 /* Enable PR-SCTP by default. */
1232 net->sctp.prsctp_enable = 1;
1233
1234 /* Disable AUTH by default. */
1235 net->sctp.auth_enable = 0;
1236
1237 /* Set SCOPE policy to enabled */
1238 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1239
1240 /* Set the default rwnd update threshold */
1241 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1242
1243 /* Initialize maximum autoclose timeout. */
1244 net->sctp.max_autoclose = INT_MAX / HZ;
1245
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001246 status = sctp_sysctl_net_register(net);
1247 if (status)
1248 goto err_sysctl_register;
1249
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001250 /* Allocate and initialise sctp mibs. */
1251 status = init_sctp_mibs(net);
1252 if (status)
1253 goto err_init_mibs;
1254
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001255 /* Initialize proc fs directory. */
1256 status = sctp_proc_init(net);
1257 if (status)
1258 goto err_init_proc;
1259
1260 sctp_dbg_objcnt_init(net);
1261
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001262 /* Initialize the control inode/socket for handling OOTB packets. */
1263 if ((status = sctp_ctl_sock_init(net))) {
1264 pr_err("Failed to initialize the SCTP control sock\n");
1265 goto err_ctl_sock_init;
1266 }
1267
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001268 /* Initialize the local address list. */
1269 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1270 spin_lock_init(&net->sctp.local_addr_lock);
1271 sctp_get_local_addr_list(net);
1272
1273 /* Initialize the address event list */
1274 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1275 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1276 spin_lock_init(&net->sctp.addr_wq_lock);
1277 net->sctp.addr_wq_timer.expires = 0;
1278 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1279 (unsigned long)net);
1280
1281 return 0;
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001282
1283err_ctl_sock_init:
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001284 sctp_dbg_objcnt_exit(net);
1285 sctp_proc_exit(net);
1286err_init_proc:
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001287 cleanup_sctp_mibs(net);
1288err_init_mibs:
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001289 sctp_sysctl_net_unregister(net);
1290err_sysctl_register:
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001291 return status;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001292}
1293
Christoph Paaschf5f417c2012-12-06 03:03:12 +00001294static void __net_exit sctp_net_exit(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001295{
1296 /* Free the local address list */
1297 sctp_free_addr_wq(net);
1298 sctp_free_local_addr_list(net);
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001299
1300 /* Free the control endpoint. */
1301 inet_ctl_sock_destroy(net->sctp.ctl_sock);
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001302
1303 sctp_dbg_objcnt_exit(net);
1304
1305 sctp_proc_exit(net);
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001306 cleanup_sctp_mibs(net);
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001307 sctp_sysctl_net_unregister(net);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001308}
1309
1310static struct pernet_operations sctp_net_ops = {
1311 .init = sctp_net_init,
1312 .exit = sctp_net_exit,
1313};
1314
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315/* Initialize the universe into something sensible. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001316static __init int sctp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317{
1318 int i;
1319 int status = -EINVAL;
1320 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001321 unsigned long limit;
1322 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 int order;
1324
Eyal Birgerb4772ef2015-03-01 14:58:29 +02001325 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001327 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 status = -ENOBUFS;
1329 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1330 sizeof(struct sctp_bind_bucket),
1331 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001332 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001334 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
1336 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1337 sizeof(struct sctp_chunk),
1338 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001339 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 if (!sctp_chunk_cachep)
1341 goto err_chunk_cachep;
1342
Tejun Heo908c7f12014-09-08 09:51:29 +09001343 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
Eric W. Biederman632c9282012-08-06 08:44:24 +00001344 if (status)
1345 goto err_percpu_counter_init;
1346
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 /* Implementation specific variables. */
1348
1349 /* Initialize default stream count setup information. */
1350 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1351 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1352
1353 /* Initialize handle used for association ids. */
1354 idr_init(&sctp_assocs_id);
1355
Eric Dumazetf03d78d2011-07-07 00:27:05 -07001356 limit = nr_free_buffer_pages() / 8;
Neil Horman4d93df02007-08-15 16:07:44 -07001357 limit = max(limit, 128UL);
1358 sysctl_sctp_mem[0] = limit / 4 * 3;
1359 sysctl_sctp_mem[1] = limit;
1360 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1361
1362 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1363 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1364 max_share = min(4UL*1024*1024, limit);
1365
Vlad Yasevich845525a2008-07-18 23:08:21 -07001366 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001367 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
Neil Horman4d93df02007-08-15 16:07:44 -07001368 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1369
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001370 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001371 sysctl_sctp_wmem[1] = 16*1024;
1372 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 /* Size and allocate the association hash table.
1375 * The methodology is similar to that of the tcp hash tables.
1376 */
Jan Beulich44813742009-09-21 17:03:05 -07001377 if (totalram_pages >= (128 * 1024))
1378 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 else
Jan Beulich44813742009-09-21 17:03:05 -07001380 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381
1382 for (order = 0; (1UL << order) < goal; order++)
1383 ;
1384
1385 do {
1386 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1387 sizeof(struct sctp_hashbucket);
1388 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1389 continue;
1390 sctp_assoc_hashtable = (struct sctp_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001391 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 } while (!sctp_assoc_hashtable && --order > 0);
1393 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001394 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 status = -ENOMEM;
1396 goto err_ahash_alloc;
1397 }
1398 for (i = 0; i < sctp_assoc_hashsize; i++) {
1399 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001400 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 }
1402
1403 /* Allocate and initialize the endpoint hash table. */
1404 sctp_ep_hashsize = 64;
Zhang Yanfei3b77d662013-03-12 13:39:47 +08001405 sctp_ep_hashtable =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1407 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001408 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 status = -ENOMEM;
1410 goto err_ehash_alloc;
1411 }
1412 for (i = 0; i < sctp_ep_hashsize; i++) {
1413 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001414 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 }
1416
1417 /* Allocate and initialize the SCTP port hash table. */
1418 do {
1419 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1420 sizeof(struct sctp_bind_hashbucket);
1421 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1422 continue;
1423 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001424 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 } while (!sctp_port_hashtable && --order > 0);
1426 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001427 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 status = -ENOMEM;
1429 goto err_bhash_alloc;
1430 }
1431 for (i = 0; i < sctp_port_hashsize; i++) {
1432 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001433 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 }
1435
Joe Perches145ce502010-08-24 13:21:08 +00001436 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 sctp_assoc_hashsize, sctp_port_hashsize);
1438
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 sctp_sysctl_register();
1440
1441 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001442 sctp_v4_pf_init();
1443 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
Vlad Yasevich270637a2008-03-20 15:17:14 -07001445 status = sctp_v4_protosw_init();
1446
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001447 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001448 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001449
Vlad Yasevich270637a2008-03-20 15:17:14 -07001450 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001452 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001454 status = register_pernet_subsys(&sctp_net_ops);
1455 if (status)
1456 goto err_register_pernet_subsys;
1457
Vlad Yasevich270637a2008-03-20 15:17:14 -07001458 status = sctp_v4_add_protocol();
1459 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001460 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001461
1462 /* Register SCTP with inet6 layer. */
1463 status = sctp_v6_add_protocol();
1464 if (status)
1465 goto err_v6_add_protocol;
1466
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467out:
1468 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001469err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001470 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001471err_add_protocol:
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001472 unregister_pernet_subsys(&sctp_net_ops);
1473err_register_pernet_subsys:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001474 sctp_v6_protosw_exit();
1475err_v6_protosw_init:
1476 sctp_v4_protosw_exit();
1477err_protosw_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001478 sctp_v4_pf_exit();
1479 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 free_pages((unsigned long)sctp_port_hashtable,
1482 get_order(sctp_port_hashsize *
1483 sizeof(struct sctp_bind_hashbucket)));
1484err_bhash_alloc:
1485 kfree(sctp_ep_hashtable);
1486err_ehash_alloc:
1487 free_pages((unsigned long)sctp_assoc_hashtable,
1488 get_order(sctp_assoc_hashsize *
1489 sizeof(struct sctp_hashbucket)));
1490err_ahash_alloc:
Eric W. Biederman632c9282012-08-06 08:44:24 +00001491 percpu_counter_destroy(&sctp_sockets_allocated);
1492err_percpu_counter_init:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 kmem_cache_destroy(sctp_chunk_cachep);
1494err_chunk_cachep:
1495 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 goto out;
1497}
1498
1499/* Exit handler for the SCTP protocol. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001500static __exit void sctp_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501{
1502 /* BUG. This should probably do something useful like clean
1503 * up all the remaining associations and all that memory.
1504 */
1505
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001506 /* Unregister with inet6/inet layers. */
1507 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001508 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001510 unregister_pernet_subsys(&sctp_net_ops);
1511
Vlad Yasevich270637a2008-03-20 15:17:14 -07001512 /* Free protosw registrations */
1513 sctp_v6_protosw_exit();
1514 sctp_v4_protosw_exit();
1515
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001516 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001517 sctp_v6_pf_exit();
1518 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001519
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522 free_pages((unsigned long)sctp_assoc_hashtable,
1523 get_order(sctp_assoc_hashsize *
1524 sizeof(struct sctp_hashbucket)));
1525 kfree(sctp_ep_hashtable);
1526 free_pages((unsigned long)sctp_port_hashtable,
1527 get_order(sctp_port_hashsize *
1528 sizeof(struct sctp_bind_hashbucket)));
1529
Eric W. Biederman632c9282012-08-06 08:44:24 +00001530 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001532 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1533
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001534 kmem_cache_destroy(sctp_chunk_cachep);
1535 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
1537
1538module_init(sctp_init);
1539module_exit(sctp_exit);
1540
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001541/*
1542 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1543 */
1544MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001545MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Daniel Borkmann91705c62013-07-23 14:51:47 +02001546MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
David S. Miller71acc0d2013-08-09 13:09:41 -07001548module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1549MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550MODULE_LICENSE("GPL");