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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) {
Marcelo Ricardo Leitner0ca50d12015-07-17 12:34:18 -0300490 struct net_device *odev;
491
Vlad Yasevich559cf712007-09-16 16:03:28 -0700492 if (!laddr->valid)
493 continue;
Marcelo Ricardo Leitner07868282015-07-17 12:34:17 -0300494 if (laddr->state != SCTP_ADDR_SRC ||
495 AF_INET != laddr->a.sa.sa_family)
496 continue;
Xufeng Zhang85350872014-04-25 16:55:41 +0800497
Marcelo Ricardo Leitner07868282015-07-17 12:34:17 -0300498 fl4->fl4_sport = laddr->a.v4.sin_port;
499 flowi4_update_output(fl4,
500 asoc->base.sk->sk_bound_dev_if,
501 RT_CONN_FLAGS(asoc->base.sk),
502 daddr->v4.sin_addr.s_addr,
503 laddr->a.v4.sin_addr.s_addr);
504
505 rt = ip_route_output_key(sock_net(sk), fl4);
506 if (IS_ERR(rt))
507 continue;
508
Marcelo Ricardo Leitner410f0382015-09-02 16:20:22 -0300509 if (!dst)
510 dst = &rt->dst;
511
Marcelo Ricardo Leitner0ca50d12015-07-17 12:34:18 -0300512 /* Ensure the src address belongs to the output
513 * interface.
514 */
515 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
516 false);
Marcelo Ricardo Leitnerd82f0f12015-09-02 16:20:21 -0300517 if (!odev || odev->ifindex != fl4->flowi4_oif) {
Marcelo Ricardo Leitner410f0382015-09-02 16:20:22 -0300518 if (&rt->dst != dst)
519 dst_release(&rt->dst);
Marcelo Ricardo Leitner0ca50d12015-07-17 12:34:18 -0300520 continue;
Marcelo Ricardo Leitnerd82f0f12015-09-02 16:20:21 -0300521 }
Marcelo Ricardo Leitner0ca50d12015-07-17 12:34:18 -0300522
Marcelo Ricardo Leitner410f0382015-09-02 16:20:22 -0300523 if (dst != &rt->dst)
524 dst_release(dst);
Marcelo Ricardo Leitner07868282015-07-17 12:34:17 -0300525 dst = &rt->dst;
526 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
528
529out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700530 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531out:
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000532 t->dst = dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (dst)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200534 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
535 &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 else
Daniel Borkmannbb333812013-06-28 19:49:40 +0200537 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538}
539
540/* For v4, the source address is cached in the route entry(dst). So no need
541 * to cache it separately and hence this is an empty routine.
542 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900543static void sctp_v4_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000544 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000545 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000547 union sctp_addr *saddr = &t->saddr;
548 struct rtable *rt = (struct rtable *)t->dst;
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (rt) {
551 saddr->v4.sin_family = AF_INET;
David S. Miller902ebd32011-05-09 14:49:13 -0700552 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554}
555
556/* What interface did this skb arrive on? */
557static int sctp_v4_skb_iif(const struct sk_buff *skb)
558{
David S. Miller92101b32012-07-23 16:29:00 -0700559 return inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562/* Was this packet marked by Explicit Congestion Notification? */
563static int sctp_v4_is_ce(const struct sk_buff *skb)
564{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700565 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
568/* Create and initialize a new sk for the socket returned by accept(). */
569static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
570 struct sctp_association *asoc)
571{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900572 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500573 sk->sk_prot, 0);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000574 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 if (!newsk)
577 goto out;
578
579 sock_init_data(NULL, newsk);
580
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000581 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 sock_reset_flag(newsk, SOCK_ZAPPED);
583
584 newinet = inet_sk(newsk);
585
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000586 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700588 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 if (newsk->sk_prot->init(newsk)) {
591 sk_common_release(newsk);
592 newsk = NULL;
593 }
594
595out:
596 return newsk;
597}
598
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600599static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600601 /* No address mapping for V4 sockets */
602 return sizeof(struct sockaddr_in);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603}
604
605/* Dump the v4 addr to the seq file. */
606static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
607{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700608 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
610
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700611static void sctp_v4_ecn_capable(struct sock *sk)
612{
613 INET_ECN_xmit(sk);
614}
615
stephen hemmingerbd2a13e2012-12-28 18:18:55 +0000616static void sctp_addr_wq_timeout_handler(unsigned long arg)
Michio Honda9f7d6532011-04-26 19:32:51 +0900617{
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000618 struct net *net = (struct net *)arg;
Michio Honda9f7d6532011-04-26 19:32:51 +0900619 struct sctp_sockaddr_entry *addrw, *temp;
620 struct sctp_sock *sp;
621
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000622 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900623
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000624 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200625 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
626 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
627 addrw->state, addrw);
Michio Honda9f7d6532011-04-26 19:32:51 +0900628
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000629#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900630 /* Now we send an ASCONF for each association */
631 /* Note. we currently don't handle link local IPv6 addressees */
632 if (addrw->a.sa.sa_family == AF_INET6) {
633 struct in6_addr *in6;
634
635 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
636 IPV6_ADDR_LINKLOCAL)
637 goto free_next;
638
639 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000640 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
Michio Honda9f7d6532011-04-26 19:32:51 +0900641 addrw->state == SCTP_ADDR_NEW) {
642 unsigned long timeo_val;
643
Daniel Borkmannbb333812013-06-28 19:49:40 +0200644 pr_debug("%s: this is on DAD, trying %d sec "
645 "later\n", __func__,
646 SCTP_ADDRESS_TICK_DELAY);
647
Michio Honda9f7d6532011-04-26 19:32:51 +0900648 timeo_val = jiffies;
649 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000650 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900651 break;
652 }
653 }
David S. Miller5d0c90c2011-06-06 13:05:55 -0700654#endif
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000655 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900656 struct sock *sk;
657
658 sk = sctp_opt2sk(sp);
659 /* ignore bound-specific endpoints */
660 if (!sctp_is_ep_boundall(sk))
661 continue;
wangweidong5bc1d1b2014-01-21 15:44:12 +0800662 bh_lock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900663 if (sctp_asconf_mgmt(sp, addrw) < 0)
Daniel Borkmannbb333812013-06-28 19:49:40 +0200664 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
wangweidong5bc1d1b2014-01-21 15:44:12 +0800665 bh_unlock_sock(sk);
Michio Honda9f7d6532011-04-26 19:32:51 +0900666 }
Daniel Halperin39d84a52012-06-18 11:04:55 +0000667#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900668free_next:
Daniel Halperin39d84a52012-06-18 11:04:55 +0000669#endif
Michio Honda9f7d6532011-04-26 19:32:51 +0900670 list_del(&addrw->list);
671 kfree(addrw);
672 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000673 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900674}
675
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000676static void sctp_free_addr_wq(struct net *net)
Michio Honda9f7d6532011-04-26 19:32:51 +0900677{
678 struct sctp_sockaddr_entry *addrw;
679 struct sctp_sockaddr_entry *temp;
680
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000681 spin_lock_bh(&net->sctp.addr_wq_lock);
682 del_timer(&net->sctp.addr_wq_timer);
683 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900684 list_del(&addrw->list);
685 kfree(addrw);
686 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000687 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900688}
689
690/* lookup the entry for the same address in the addr_waitq
691 * sctp_addr_wq MUST be locked
692 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000693static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
694 struct sctp_sockaddr_entry *addr)
Michio Honda9f7d6532011-04-26 19:32:51 +0900695{
696 struct sctp_sockaddr_entry *addrw;
697
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000698 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900699 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
700 continue;
701 if (addrw->a.sa.sa_family == AF_INET) {
702 if (addrw->a.v4.sin_addr.s_addr ==
703 addr->a.v4.sin_addr.s_addr)
704 return addrw;
705 } else if (addrw->a.sa.sa_family == AF_INET6) {
706 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
707 &addr->a.v6.sin6_addr))
708 return addrw;
709 }
710 }
711 return NULL;
712}
713
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000714void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
Michio Honda9f7d6532011-04-26 19:32:51 +0900715{
716 struct sctp_sockaddr_entry *addrw;
717 unsigned long timeo_val;
718
719 /* first, we check if an opposite message already exist in the queue.
720 * If we found such message, it is removed.
721 * This operation is a bit stupid, but the DHCP client attaches the
722 * new address after a couple of addition and deletion of that address
723 */
724
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000725 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900726 /* Offsets existing events in addr_wq */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000727 addrw = sctp_addr_wq_lookup(net, addr);
Michio Honda9f7d6532011-04-26 19:32:51 +0900728 if (addrw) {
729 if (addrw->state != cmd) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200730 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
731 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
732 &net->sctp.addr_waitq);
733
Michio Honda9f7d6532011-04-26 19:32:51 +0900734 list_del(&addrw->list);
735 kfree(addrw);
736 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000737 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900738 return;
739 }
740
741 /* OK, we have to add the new address to the wait queue */
742 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
743 if (addrw == NULL) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000744 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900745 return;
746 }
747 addrw->state = cmd;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000748 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200749
750 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
751 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900752
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000753 if (!timer_pending(&net->sctp.addr_wq_timer)) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900754 timeo_val = jiffies;
755 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000756 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900757 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000758 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900759}
760
Vlad Yasevich29303542007-09-16 16:02:12 -0700761/* Event handler for inet address addition/deletion events.
762 * The sctp_local_addr_list needs to be protocted by a spin lock since
763 * multiple notifiers (say IPv4 and IPv6) may be running at the same
764 * time and thus corrupt the list.
765 * The reader side is protected with RCU.
766 */
Adrian Bunk24123182006-12-20 16:08:22 -0800767static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
768 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800770 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700771 struct sctp_sockaddr_entry *addr = NULL;
772 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000773 struct net *net = dev_net(ifa->ifa_dev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700774 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800776 switch (ev) {
777 case NETDEV_UP:
778 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
779 if (addr) {
780 addr->a.v4.sin_family = AF_INET;
781 addr->a.v4.sin_port = 0;
782 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700783 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000784 spin_lock_bh(&net->sctp.local_addr_lock);
785 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
786 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
787 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800788 }
789 break;
790 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000791 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700792 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000793 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700794 if (addr->a.sa.sa_family == AF_INET &&
795 addr->a.v4.sin_addr.s_addr ==
796 ifa->ifa_local) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000797 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700798 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700799 addr->valid = 0;
800 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800801 break;
802 }
803 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000804 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700805 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800806 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800807 break;
808 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 return NOTIFY_DONE;
811}
812
813/*
814 * Initialize the control inode/socket with a control endpoint data
815 * structure. This endpoint is reserved exclusively for the OOTB processing.
816 */
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000817static int sctp_ctl_sock_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
819 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800820 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 if (sctp_get_pf_specific(PF_INET6))
823 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000825 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
826 SOCK_SEQPACKET, IPPROTO_SCTP, net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800827
828 /* If IPv6 socket could not be created, try the IPv4 socket */
829 if (err < 0 && family == PF_INET6)
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000830 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800831 SOCK_SEQPACKET, IPPROTO_SCTP,
Eric W. Biederman2ce95502012-08-06 08:43:06 +0000832 net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000835 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 return err;
837 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return 0;
839}
840
841/* Register address family specific functions. */
842int sctp_register_af(struct sctp_af *af)
843{
844 switch (af->sa_family) {
845 case AF_INET:
846 if (sctp_af_v4_specific)
847 return 0;
848 sctp_af_v4_specific = af;
849 break;
850 case AF_INET6:
851 if (sctp_af_v6_specific)
852 return 0;
853 sctp_af_v6_specific = af;
854 break;
855 default:
856 return 0;
857 }
858
859 INIT_LIST_HEAD(&af->list);
860 list_add_tail(&af->list, &sctp_address_families);
861 return 1;
862}
863
864/* Get the table of functions for manipulating a particular address
865 * family.
866 */
867struct sctp_af *sctp_get_af_specific(sa_family_t family)
868{
869 switch (family) {
870 case AF_INET:
871 return sctp_af_v4_specific;
872 case AF_INET6:
873 return sctp_af_v6_specific;
874 default:
875 return NULL;
876 }
877}
878
879/* Common code to initialize a AF_INET msg_name. */
880static void sctp_inet_msgname(char *msgname, int *addr_len)
881{
882 struct sockaddr_in *sin;
883
884 sin = (struct sockaddr_in *)msgname;
885 *addr_len = sizeof(struct sockaddr_in);
886 sin->sin_family = AF_INET;
887 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
888}
889
890/* Copy the primary address of the peer primary address as the msg_name. */
891static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
892 int *addr_len)
893{
894 struct sockaddr_in *sin, *sinfrom;
895
896 if (msgname) {
897 struct sctp_association *asoc;
898
899 asoc = event->asoc;
900 sctp_inet_msgname(msgname, addr_len);
901 sin = (struct sockaddr_in *)msgname;
902 sinfrom = &asoc->peer.primary_addr.v4;
903 sin->sin_port = htons(asoc->peer.port);
904 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
905 }
906}
907
908/* Initialize and copy out a msgname from an inbound skb. */
909static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
910{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300912 struct sctphdr *sh = sctp_hdr(skb);
913 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700917 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 }
919}
920
921/* Do we support this AF? */
922static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
923{
924 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000925 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926}
927
928/* Address matching with wildcards allowed. */
929static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
930 const union sctp_addr *addr2,
931 struct sctp_sock *opt)
932{
933 /* PF_INET only supports AF_INET addresses. */
934 if (addr1->sa.sa_family != addr2->sa.sa_family)
935 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700936 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
937 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 return 1;
939 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
940 return 1;
941
942 return 0;
943}
944
945/* Verify that provided sockaddr looks bindable. Common verification has
946 * already been taken care of.
947 */
948static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
949{
950 return sctp_v4_available(addr, opt);
951}
952
953/* Verify that sockaddr looks sendable. Common verification has already
954 * been taken care of.
955 */
956static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
957{
958 return 1;
959}
960
961/* Fill in Supported Address Type information for INIT and INIT-ACK
962 * chunks. Returns number of addresses supported.
963 */
964static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800965 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966{
967 types[0] = SCTP_PARAM_IPV4_ADDRESS;
968 return 1;
969}
970
971/* Wrapper routine that calls the ip transmit routine. */
972static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700973 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
Herbert Xuf8803742008-08-03 21:15:08 -0700975 struct inet_sock *inet = inet_sk(skb->sk);
976
Daniel Borkmannbb333812013-06-28 19:49:40 +0200977 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
978 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
Herbert Xuf8803742008-08-03 21:15:08 -0700980 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
981 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
982
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000983 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200984
Eric Dumazetb0270e92014-04-15 12:58:34 -0400985 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986}
987
Neil Horman15efbe72008-02-15 09:53:59 -0500988static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990static struct sctp_pf sctp_pf_inet = {
991 .event_msgname = sctp_inet_event_msgname,
992 .skb_msgname = sctp_inet_skb_msgname,
993 .af_supported = sctp_inet_af_supported,
994 .cmp_addr = sctp_inet_cmp_addr,
995 .bind_verify = sctp_inet_bind_verify,
996 .send_verify = sctp_inet_send_verify,
997 .supported_addrs = sctp_inet_supported_addrs,
998 .create_accept_sk = sctp_v4_create_accept_sk,
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600999 .addr_to_user = sctp_v4_addr_to_user,
1000 .to_sk_saddr = sctp_v4_to_sk_saddr,
1001 .to_sk_daddr = sctp_v4_to_sk_daddr,
Neil Horman15efbe72008-02-15 09:53:59 -05001002 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003};
1004
1005/* Notifier for inetaddr addition/deletion events. */
1006static struct notifier_block sctp_inetaddr_notifier = {
1007 .notifier_call = sctp_inetaddr_event,
1008};
1009
1010/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001011static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001012 .family = PF_INET,
1013 .owner = THIS_MODULE,
1014 .release = inet_release, /* Needs to be wrapped... */
1015 .bind = inet_bind,
1016 .connect = inet_dgram_connect,
1017 .socketpair = sock_no_socketpair,
1018 .accept = inet_accept,
1019 .getname = inet_getname, /* Semantics are different. */
1020 .poll = sctp_poll,
1021 .ioctl = inet_ioctl,
1022 .listen = sctp_inet_listen,
1023 .shutdown = inet_shutdown, /* Looks harmless. */
1024 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1025 .getsockopt = sock_common_getsockopt,
1026 .sendmsg = inet_sendmsg,
1027 .recvmsg = sock_common_recvmsg,
1028 .mmap = sock_no_mmap,
1029 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001030#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001031 .compat_setsockopt = compat_sock_common_setsockopt,
1032 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001033#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034};
1035
1036/* Registration with AF_INET family. */
1037static struct inet_protosw sctp_seqpacket_protosw = {
1038 .type = SOCK_SEQPACKET,
1039 .protocol = IPPROTO_SCTP,
1040 .prot = &sctp_prot,
1041 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 .flags = SCTP_PROTOSW_FLAG
1043};
1044static struct inet_protosw sctp_stream_protosw = {
1045 .type = SOCK_STREAM,
1046 .protocol = IPPROTO_SCTP,
1047 .prot = &sctp_prot,
1048 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 .flags = SCTP_PROTOSW_FLAG
1050};
1051
1052/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +00001053static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 .handler = sctp_rcv,
1055 .err_handler = sctp_v4_err,
1056 .no_policy = 1,
Eric W. Biedermanbb2db452012-08-06 08:46:26 +00001057 .netns_ok = 1,
Hannes Frederic Sowa8ed1dc42014-01-09 10:01:17 +01001058 .icmp_strict_tag_validation = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059};
1060
1061/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001062static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001063 .sa_family = AF_INET,
1064 .sctp_xmit = sctp_v4_xmit,
1065 .setsockopt = ip_setsockopt,
1066 .getsockopt = ip_getsockopt,
1067 .get_dst = sctp_v4_get_dst,
1068 .get_saddr = sctp_v4_get_saddr,
1069 .copy_addrlist = sctp_v4_copy_addrlist,
1070 .from_skb = sctp_v4_from_skb,
1071 .from_sk = sctp_v4_from_sk,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001072 .from_addr_param = sctp_v4_from_addr_param,
1073 .to_addr_param = sctp_v4_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001074 .cmp_addr = sctp_v4_cmp_addr,
1075 .addr_valid = sctp_v4_addr_valid,
1076 .inaddr_any = sctp_v4_inaddr_any,
1077 .is_any = sctp_v4_is_any,
1078 .available = sctp_v4_available,
1079 .scope = sctp_v4_scope,
1080 .skb_iif = sctp_v4_skb_iif,
1081 .is_ce = sctp_v4_is_ce,
1082 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001083 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001084 .net_header_len = sizeof(struct iphdr),
1085 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001086#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001087 .compat_setsockopt = compat_ip_setsockopt,
1088 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001089#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090};
1091
wangweidong8d726512013-12-23 12:16:53 +08001092struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1093{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 switch (family) {
1095 case PF_INET:
1096 return sctp_pf_inet_specific;
1097 case PF_INET6:
1098 return sctp_pf_inet6_specific;
1099 default:
1100 return NULL;
1101 }
1102}
1103
1104/* Register the PF specific function table. */
1105int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1106{
1107 switch (family) {
1108 case PF_INET:
1109 if (sctp_pf_inet_specific)
1110 return 0;
1111 sctp_pf_inet_specific = pf;
1112 break;
1113 case PF_INET6:
1114 if (sctp_pf_inet6_specific)
1115 return 0;
1116 sctp_pf_inet6_specific = pf;
1117 break;
1118 default:
1119 return 0;
1120 }
1121 return 1;
1122}
1123
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001124static inline int init_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125{
WANG Cong698365f2014-05-05 15:55:55 -07001126 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1127 if (!net->sctp.sctp_statistics)
1128 return -ENOMEM;
1129 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130}
1131
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001132static inline void cleanup_sctp_mibs(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133{
WANG Cong698365f2014-05-05 15:55:55 -07001134 free_percpu(net->sctp.sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135}
1136
Vlad Yasevich270637a2008-03-20 15:17:14 -07001137static void sctp_v4_pf_init(void)
1138{
1139 /* Initialize the SCTP specific PF functions. */
1140 sctp_register_pf(&sctp_pf_inet, PF_INET);
1141 sctp_register_af(&sctp_af_inet);
1142}
1143
1144static void sctp_v4_pf_exit(void)
1145{
1146 list_del(&sctp_af_inet.list);
1147}
1148
1149static int sctp_v4_protosw_init(void)
1150{
1151 int rc;
1152
1153 rc = proto_register(&sctp_prot, 1);
1154 if (rc)
1155 return rc;
1156
1157 /* Register SCTP(UDP and TCP style) with socket layer. */
1158 inet_register_protosw(&sctp_seqpacket_protosw);
1159 inet_register_protosw(&sctp_stream_protosw);
1160
1161 return 0;
1162}
1163
1164static void sctp_v4_protosw_exit(void)
1165{
1166 inet_unregister_protosw(&sctp_stream_protosw);
1167 inet_unregister_protosw(&sctp_seqpacket_protosw);
1168 proto_unregister(&sctp_prot);
1169}
1170
1171static int sctp_v4_add_protocol(void)
1172{
1173 /* Register notifier for inet address additions/deletions. */
1174 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1175
1176 /* Register SCTP with inet layer. */
1177 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1178 return -EAGAIN;
1179
1180 return 0;
1181}
1182
1183static void sctp_v4_del_protocol(void)
1184{
1185 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1186 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1187}
1188
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001189static int __net_init sctp_defaults_init(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001190{
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001191 int status;
1192
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001193 /*
1194 * 14. Suggested SCTP Protocol Parameter Values
1195 */
1196 /* The following protocol parameters are RECOMMENDED: */
1197 /* RTO.Initial - 3 seconds */
1198 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1199 /* RTO.Min - 1 second */
1200 net->sctp.rto_min = SCTP_RTO_MIN;
1201 /* RTO.Max - 60 seconds */
1202 net->sctp.rto_max = SCTP_RTO_MAX;
1203 /* RTO.Alpha - 1/8 */
1204 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1205 /* RTO.Beta - 1/4 */
1206 net->sctp.rto_beta = SCTP_RTO_BETA;
1207
1208 /* Valid.Cookie.Life - 60 seconds */
1209 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1210
1211 /* Whether Cookie Preservative is enabled(1) or not(0) */
1212 net->sctp.cookie_preserve_enable = 1;
1213
Neil Horman3c681982012-10-24 09:20:03 +00001214 /* Default sctp sockets to use md5 as their hmac alg */
Neil Horman0d0863b2012-12-14 15:22:01 +00001215#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
Neil Horman3c681982012-10-24 09:20:03 +00001216 net->sctp.sctp_hmac_alg = "md5";
Neil Horman0d0863b2012-12-14 15:22:01 +00001217#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
Neil Horman3c681982012-10-24 09:20:03 +00001218 net->sctp.sctp_hmac_alg = "sha1";
1219#else
1220 net->sctp.sctp_hmac_alg = NULL;
1221#endif
1222
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001223 /* Max.Burst - 4 */
1224 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1225
Zhu Yanjun566178f2015-12-16 13:55:04 +08001226 /* Enable pf state by default */
1227 net->sctp.pf_enable = 1;
1228
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001229 /* Association.Max.Retrans - 10 attempts
1230 * Path.Max.Retrans - 5 attempts (per destination address)
1231 * Max.Init.Retransmits - 8 attempts
1232 */
1233 net->sctp.max_retrans_association = 10;
1234 net->sctp.max_retrans_path = 5;
1235 net->sctp.max_retrans_init = 8;
1236
1237 /* Sendbuffer growth - do per-socket accounting */
1238 net->sctp.sndbuf_policy = 0;
1239
1240 /* Rcvbuffer growth - do per-socket accounting */
1241 net->sctp.rcvbuf_policy = 0;
1242
1243 /* HB.interval - 30 seconds */
1244 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1245
1246 /* delayed SACK timeout */
1247 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1248
1249 /* Disable ADDIP by default. */
1250 net->sctp.addip_enable = 0;
1251 net->sctp.addip_noauth = 0;
1252 net->sctp.default_auto_asconf = 0;
1253
1254 /* Enable PR-SCTP by default. */
1255 net->sctp.prsctp_enable = 1;
1256
1257 /* Disable AUTH by default. */
1258 net->sctp.auth_enable = 0;
1259
1260 /* Set SCOPE policy to enabled */
1261 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1262
1263 /* Set the default rwnd update threshold */
1264 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1265
1266 /* Initialize maximum autoclose timeout. */
1267 net->sctp.max_autoclose = INT_MAX / HZ;
1268
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001269 status = sctp_sysctl_net_register(net);
1270 if (status)
1271 goto err_sysctl_register;
1272
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001273 /* Allocate and initialise sctp mibs. */
1274 status = init_sctp_mibs(net);
1275 if (status)
1276 goto err_init_mibs;
1277
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001278 /* Initialize proc fs directory. */
1279 status = sctp_proc_init(net);
1280 if (status)
1281 goto err_init_proc;
1282
1283 sctp_dbg_objcnt_init(net);
1284
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001285 /* Initialize the local address list. */
1286 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1287 spin_lock_init(&net->sctp.local_addr_lock);
1288 sctp_get_local_addr_list(net);
1289
1290 /* Initialize the address event list */
1291 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1292 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1293 spin_lock_init(&net->sctp.addr_wq_lock);
1294 net->sctp.addr_wq_timer.expires = 0;
1295 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1296 (unsigned long)net);
1297
1298 return 0;
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001299
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001300err_init_proc:
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001301 cleanup_sctp_mibs(net);
1302err_init_mibs:
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001303 sctp_sysctl_net_unregister(net);
1304err_sysctl_register:
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001305 return status;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001306}
1307
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001308static void __net_exit sctp_defaults_exit(struct net *net)
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001309{
1310 /* Free the local address list */
1311 sctp_free_addr_wq(net);
1312 sctp_free_local_addr_list(net);
Eric W. Biederman2ce95502012-08-06 08:43:06 +00001313
Eric W. Biederman13d782f2012-08-06 08:45:15 +00001314 sctp_dbg_objcnt_exit(net);
1315
1316 sctp_proc_exit(net);
Eric W. Biedermanb01a2402012-08-06 08:47:55 +00001317 cleanup_sctp_mibs(net);
Eric W. Biedermanebb7e952012-08-07 07:23:59 +00001318 sctp_sysctl_net_unregister(net);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001319}
1320
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001321static struct pernet_operations sctp_defaults_ops = {
1322 .init = sctp_defaults_init,
1323 .exit = sctp_defaults_exit,
1324};
1325
1326static int __net_init sctp_ctrlsock_init(struct net *net)
1327{
1328 int status;
1329
1330 /* Initialize the control inode/socket for handling OOTB packets. */
1331 status = sctp_ctl_sock_init(net);
1332 if (status)
1333 pr_err("Failed to initialize the SCTP control sock\n");
1334
1335 return status;
1336}
1337
1338static void __net_init sctp_ctrlsock_exit(struct net *net)
1339{
1340 /* Free the control endpoint. */
1341 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1342}
1343
1344static struct pernet_operations sctp_ctrlsock_ops = {
1345 .init = sctp_ctrlsock_init,
1346 .exit = sctp_ctrlsock_exit,
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001347};
1348
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349/* Initialize the universe into something sensible. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001350static __init int sctp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
1352 int i;
1353 int status = -EINVAL;
1354 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001355 unsigned long limit;
1356 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 int order;
1358
Eyal Birgerb4772ef2015-03-01 14:58:29 +02001359 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001361 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 status = -ENOBUFS;
1363 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1364 sizeof(struct sctp_bind_bucket),
1365 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001366 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001368 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
1370 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1371 sizeof(struct sctp_chunk),
1372 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001373 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 if (!sctp_chunk_cachep)
1375 goto err_chunk_cachep;
1376
Tejun Heo908c7f12014-09-08 09:51:29 +09001377 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
Eric W. Biederman632c9282012-08-06 08:44:24 +00001378 if (status)
1379 goto err_percpu_counter_init;
1380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 /* Implementation specific variables. */
1382
1383 /* Initialize default stream count setup information. */
1384 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1385 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1386
1387 /* Initialize handle used for association ids. */
1388 idr_init(&sctp_assocs_id);
1389
Eric Dumazetf03d78d2011-07-07 00:27:05 -07001390 limit = nr_free_buffer_pages() / 8;
Neil Horman4d93df02007-08-15 16:07:44 -07001391 limit = max(limit, 128UL);
1392 sysctl_sctp_mem[0] = limit / 4 * 3;
1393 sysctl_sctp_mem[1] = limit;
1394 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1395
1396 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1397 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1398 max_share = min(4UL*1024*1024, limit);
1399
Vlad Yasevich845525a2008-07-18 23:08:21 -07001400 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001401 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
Neil Horman4d93df02007-08-15 16:07:44 -07001402 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1403
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001404 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001405 sysctl_sctp_wmem[1] = 16*1024;
1406 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 /* Size and allocate the association hash table.
1409 * The methodology is similar to that of the tcp hash tables.
1410 */
Jan Beulich44813742009-09-21 17:03:05 -07001411 if (totalram_pages >= (128 * 1024))
1412 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 else
Jan Beulich44813742009-09-21 17:03:05 -07001414 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
1416 for (order = 0; (1UL << order) < goal; order++)
1417 ;
1418
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 /* Allocate and initialize the endpoint hash table. */
1420 sctp_ep_hashsize = 64;
Zhang Yanfei3b77d662013-03-12 13:39:47 +08001421 sctp_ep_hashtable =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1423 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001424 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 status = -ENOMEM;
1426 goto err_ehash_alloc;
1427 }
1428 for (i = 0; i < sctp_ep_hashsize; i++) {
1429 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001430 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
1432
1433 /* Allocate and initialize the SCTP port hash table. */
1434 do {
1435 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1436 sizeof(struct sctp_bind_hashbucket);
1437 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1438 continue;
1439 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
Eric Dumazet6857a022015-12-15 15:33:39 -08001440 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 } while (!sctp_port_hashtable && --order > 0);
1442 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001443 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 status = -ENOMEM;
1445 goto err_bhash_alloc;
1446 }
1447 for (i = 0; i < sctp_port_hashsize; i++) {
1448 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001449 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 }
1451
Xin Long4f008782015-12-30 23:50:47 +08001452 if (sctp_transport_hashtable_init())
1453 goto err_thash_alloc;
1454
Xin Longb5eff712015-12-30 23:50:49 +08001455 pr_info("Hash tables configured (bind %d)\n", sctp_port_hashsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 sctp_sysctl_register();
1458
1459 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001460 sctp_v4_pf_init();
1461 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001463 status = register_pernet_subsys(&sctp_defaults_ops);
1464 if (status)
1465 goto err_register_defaults;
Vlad Yasevich270637a2008-03-20 15:17:14 -07001466
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001467 status = sctp_v4_protosw_init();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001468 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001469 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001470
Vlad Yasevich270637a2008-03-20 15:17:14 -07001471 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001473 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001475 status = register_pernet_subsys(&sctp_ctrlsock_ops);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001476 if (status)
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001477 goto err_register_ctrlsock;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001478
Vlad Yasevich270637a2008-03-20 15:17:14 -07001479 status = sctp_v4_add_protocol();
1480 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001481 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001482
1483 /* Register SCTP with inet6 layer. */
1484 status = sctp_v6_add_protocol();
1485 if (status)
1486 goto err_v6_add_protocol;
1487
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488out:
1489 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001490err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001491 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001492err_add_protocol:
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001493 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1494err_register_ctrlsock:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001495 sctp_v6_protosw_exit();
1496err_v6_protosw_init:
1497 sctp_v4_protosw_exit();
1498err_protosw_init:
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001499 unregister_pernet_subsys(&sctp_defaults_ops);
1500err_register_defaults:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001501 sctp_v4_pf_exit();
1502 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 free_pages((unsigned long)sctp_port_hashtable,
1505 get_order(sctp_port_hashsize *
1506 sizeof(struct sctp_bind_hashbucket)));
1507err_bhash_alloc:
Xin Long4f008782015-12-30 23:50:47 +08001508 sctp_transport_hashtable_destroy();
1509err_thash_alloc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 kfree(sctp_ep_hashtable);
1511err_ehash_alloc:
Eric W. Biederman632c9282012-08-06 08:44:24 +00001512 percpu_counter_destroy(&sctp_sockets_allocated);
1513err_percpu_counter_init:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 kmem_cache_destroy(sctp_chunk_cachep);
1515err_chunk_cachep:
1516 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 goto out;
1518}
1519
1520/* Exit handler for the SCTP protocol. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001521static __exit void sctp_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522{
1523 /* BUG. This should probably do something useful like clean
1524 * up all the remaining associations and all that memory.
1525 */
1526
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001527 /* Unregister with inet6/inet layers. */
1528 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001529 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001531 unregister_pernet_subsys(&sctp_ctrlsock_ops);
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001532
Vlad Yasevich270637a2008-03-20 15:17:14 -07001533 /* Free protosw registrations */
1534 sctp_v6_protosw_exit();
1535 sctp_v4_protosw_exit();
1536
Marcelo Ricardo Leitner8e2d61e2015-09-10 17:31:15 -03001537 unregister_pernet_subsys(&sctp_defaults_ops);
1538
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001539 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001540 sctp_v6_pf_exit();
1541 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001542
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 free_pages((unsigned long)sctp_port_hashtable,
1546 get_order(sctp_port_hashsize *
1547 sizeof(struct sctp_bind_hashbucket)));
Xin Longb5eff712015-12-30 23:50:49 +08001548 kfree(sctp_ep_hashtable);
Xin Long4f008782015-12-30 23:50:47 +08001549 sctp_transport_hashtable_destroy();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
Eric W. Biederman632c9282012-08-06 08:44:24 +00001551 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001553 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1554
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001555 kmem_cache_destroy(sctp_chunk_cachep);
1556 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557}
1558
1559module_init(sctp_init);
1560module_exit(sctp_exit);
1561
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001562/*
1563 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1564 */
1565MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001566MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Daniel Borkmann91705c62013-07-23 14:51:47 +02001567MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
David S. Miller71acc0d2013-08-09 13:09:41 -07001569module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1570MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571MODULE_LICENSE("GPL");