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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Initialization/cleanup for SCTP protocol support.
12 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 *
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
47 */
48
Joe Perches145ce502010-08-24 13:21:08 +000049#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
Neil Horman4d93df02007-08-15 16:07:44 -070056#include <linux/bootmem.h>
Vlad Yasevich845525a2008-07-18 23:08:21 -070057#include <linux/highmem.h>
58#include <linux/swap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020060#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020064#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70/* Global data structures. */
Brian Haley4cbf1ca2006-09-18 00:04:22 -070071struct sctp_globals sctp_globals __read_mostly;
Eric Dumazetba899662005-08-26 12:05:31 -070072DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Florian Westphalc4e85f82008-07-18 23:03:44 -070074#ifdef CONFIG_PROC_FS
75struct proc_dir_entry *proc_net_sctp;
76#endif
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078struct idr sctp_assocs_id;
79DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81/* This is the global socket data structure used for responding to
82 * the Out-of-the-blue (OOTB) packets. A control sock will be created
83 * for this socket at the initialization time.
84 */
Denis V. Lunev82581752008-04-03 14:27:26 -070085static struct sock *sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87static struct sctp_pf *sctp_pf_inet6_specific;
88static struct sctp_pf *sctp_pf_inet_specific;
89static struct sctp_af *sctp_af_v4_specific;
90static struct sctp_af *sctp_af_v6_specific;
91
Christoph Lametere18b8902006-12-06 20:33:20 -080092struct kmem_cache *sctp_chunk_cachep __read_mostly;
93struct kmem_cache *sctp_bucket_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Eric Dumazet8d987e52010-11-09 23:24:26 +000095long sysctl_sctp_mem[3];
Vlad Yasevich007e3932007-09-16 16:04:37 -070096int sysctl_sctp_rmem[3];
97int sysctl_sctp_wmem[3];
Neil Horman4d93df02007-08-15 16:07:44 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* Return the address of the control sock. */
100struct sock *sctp_get_ctl_sock(void)
101{
Denis V. Lunev82581752008-04-03 14:27:26 -0700102 return sctp_ctl_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
105/* Set up the proc fs entry for the SCTP protocol. */
106static __init int sctp_proc_init(void)
107{
Eric Dumazet17483762008-11-25 21:16:35 -0800108 if (percpu_counter_init(&sctp_sockets_allocated, 0))
109 goto out_nomem;
Florian Westphalc4e85f82008-07-18 23:03:44 -0700110#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!proc_net_sctp) {
Alexey Dobriyan99b76232009-03-25 22:48:06 +0300112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
113 if (!proc_net_sctp)
Eric Dumazet17483762008-11-25 21:16:35 -0800114 goto out_free_percpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116
117 if (sctp_snmp_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700118 goto out_snmp_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (sctp_eps_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700120 goto out_eps_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (sctp_assocs_proc_init())
Wei Yongjun80896a32008-06-16 16:59:55 -0700122 goto out_assocs_proc_init;
Neil Horman20c2c1f2008-05-09 15:14:50 -0700123 if (sctp_remaddr_proc_init())
David S. Millercaea9022008-06-16 18:25:48 -0700124 goto out_remaddr_proc_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 return 0;
127
David S. Millercaea9022008-06-16 18:25:48 -0700128out_remaddr_proc_init:
Pavel Emelyanov3d00fb92008-06-17 15:54:14 -0700129 sctp_assocs_proc_exit();
Wei Yongjun80896a32008-06-16 16:59:55 -0700130out_assocs_proc_init:
131 sctp_eps_proc_exit();
132out_eps_proc_init:
133 sctp_snmp_proc_exit();
134out_snmp_proc_init:
135 if (proc_net_sctp) {
136 proc_net_sctp = NULL;
137 remove_proc_entry("sctp", init_net.proc_net);
138 }
Eric Dumazet17483762008-11-25 21:16:35 -0800139out_free_percpu:
140 percpu_counter_destroy(&sctp_sockets_allocated);
Florian Westphalc4e85f82008-07-18 23:03:44 -0700141#else
142 return 0;
143#endif /* CONFIG_PROC_FS */
Randy Dunlap157653c2008-11-27 15:30:53 -0800144
145out_nomem:
146 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900149/* Clean up the proc fs entry for the SCTP protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * Note: Do not make this __exit as it is used in the init error
151 * path.
152 */
153static void sctp_proc_exit(void)
154{
Florian Westphalc4e85f82008-07-18 23:03:44 -0700155#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
Neil Horman20c2c1f2008-05-09 15:14:50 -0700159 sctp_remaddr_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 if (proc_net_sctp) {
162 proc_net_sctp = NULL;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200163 remove_proc_entry("sctp", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
Florian Westphalc4e85f82008-07-18 23:03:44 -0700165#endif
Rafael Laufer418372b2009-08-07 05:17:17 +0000166 percpu_counter_destroy(&sctp_sockets_allocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169/* Private helper to extract ipv4 address and stash them in
170 * the protocol structure.
171 */
172static void sctp_v4_copy_addrlist(struct list_head *addrlist,
173 struct net_device *dev)
174{
175 struct in_device *in_dev;
176 struct in_ifaddr *ifa;
177 struct sctp_sockaddr_entry *addr;
178
179 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 rcu_read_unlock();
182 return;
183 }
184
185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
186 /* Add the address to the local list. */
187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
188 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800189 addr->a.v4.sin_family = AF_INET;
190 addr->a.v4.sin_port = 0;
191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700192 addr->valid = 1;
193 INIT_LIST_HEAD(&addr->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 list_add_tail(&addr->list, addrlist);
195 }
196 }
197
198 rcu_read_unlock();
199}
200
201/* Extract our IP addresses from the system and stash them in the
202 * protocol structure.
203 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000204static void sctp_get_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 struct net_device *dev;
207 struct list_head *pos;
208 struct sctp_af *af;
209
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800210 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000211 for_each_netdev_rcu(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 __list_for_each(pos, &sctp_address_families) {
213 af = list_entry(pos, struct sctp_af, list);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000214 af->copy_addrlist(&net->sctp.local_addr_list, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800217 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220/* Free the existing local addresses. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000221static void sctp_free_local_addr_list(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 struct sctp_sockaddr_entry *addr;
224 struct list_head *pos, *temp;
225
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000226 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
228 list_del(pos);
229 kfree(addr);
230 }
231}
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233/* Copy the local addresses which are valid for 'scope' into 'bp'. */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000234int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
235 sctp_scope_t scope, gfp_t gfp, int copy_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct sctp_sockaddr_entry *addr;
238 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Vlad Yasevich29303542007-09-16 16:02:12 -0700240 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000241 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -0700242 if (!addr->valid)
243 continue;
Al Viro6244be42006-11-20 17:21:44 -0800244 if (sctp_in_scope(&addr->a, scope)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 /* Now that the address is in scope, check to see if
246 * the address type is really supported by the local
247 * sock as well as the remote peer.
248 */
Al Viro6244be42006-11-20 17:21:44 -0800249 if ((((AF_INET == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
Al Viro6244be42006-11-20 17:21:44 -0800251 (((AF_INET6 == addr->a.sa.sa_family) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 (copy_flags & SCTP_ADDR6_ALLOWED) &&
253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800254 error = sctp_add_bind_addr(bp, &addr->a,
255 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (error)
257 goto end_copy;
258 }
259 }
260 }
261
262end_copy:
Vlad Yasevich29303542007-09-16 16:02:12 -0700263 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return error;
265}
266
267/* Initialize a sctp_addr from in incoming skb. */
268static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
269 int is_saddr)
270{
271 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800272 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 struct sctphdr *sh;
274
275 port = &addr->v4.sin_port;
276 addr->v4.sin_family = AF_INET;
277
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300278 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800280 *port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700281 from = &ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800283 *port = sh->dest;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700284 from = &ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
287}
288
289/* Initialize an sctp_addr from a socket. */
290static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
291{
292 addr->v4.sin_family = AF_INET;
Al Viro7dcdbd92006-11-20 17:24:21 -0800293 addr->v4.sin_port = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
297/* Initialize sk->sk_rcv_saddr from sctp_addr. */
298static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
299{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303/* Initialize sk->sk_daddr from sctp_addr. */
304static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
305{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309/* Initialize a sctp_addr from an address parameter. */
310static void sctp_v4_from_addr_param(union sctp_addr *addr,
311 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800312 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_port = port;
316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
317}
318
319/* Initialize an address parameter from a sctp_addr and return the length
320 * of the address parameter.
321 */
322static int sctp_v4_to_addr_param(const union sctp_addr *addr,
323 union sctp_addr_param *param)
324{
325 int length = sizeof(sctp_ipv4addr_param_t);
326
327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800328 param->v4.param_hdr.length = htons(length);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 return length;
332}
333
334/* Initialize a sctp_addr from a dst_entry. */
David S. Miller18a353f42011-05-03 20:55:05 -0700335static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
Al Viro854d43a2006-11-20 17:06:24 -0800336 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 saddr->v4.sin_family = AF_INET;
339 saddr->v4.sin_port = port;
David S. Miller18a353f42011-05-03 20:55:05 -0700340 saddr->v4.sin_addr.s_addr = fl4->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
342
343/* Compare two addresses exactly. */
344static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
345 const union sctp_addr *addr2)
346{
347 if (addr1->sa.sa_family != addr2->sa.sa_family)
348 return 0;
349 if (addr1->v4.sin_port != addr2->v4.sin_port)
350 return 0;
351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
352 return 0;
353
354 return 1;
355}
356
357/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800358static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
360 addr->v4.sin_family = AF_INET;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 addr->v4.sin_port = port;
363}
364
365/* Is this a wildcard address? */
366static int sctp_v4_is_any(const union sctp_addr *addr)
367{
Al Viroe6f1ceb2008-03-17 22:44:53 -0700368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
371/* This function checks if the address is a valid address to be used for
372 * SCTP binding.
373 *
374 * Output:
375 * Return 0 - If the address is a non-unicast or an illegal address.
376 * Return 1 - If the address is a unicast.
377 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700378static int sctp_v4_addr_valid(union sctp_addr *addr,
379 struct sctp_sock *sp,
380 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700382 /* IPv4 addresses not allowed */
383 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
384 return 0;
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 /* Is this a non-unicast address or a unusable SCTP address? */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 return 0;
389
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900390 /* Is this a broadcast address? */
Eric Dumazet511c3f92009-06-02 05:14:27 +0000391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900392 return 0;
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return 1;
395}
396
397/* Should this be available for binding? */
398static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
399{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Al Viroe6f1ceb2008-03-17 22:44:53 -0700403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
Neil Hormancdac4e02005-06-13 15:12:33 -0700404 ret != RTN_LOCAL &&
405 !sp->inet.freebind &&
406 !sysctl_ip_nonlocal_bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 return 0;
Neil Hormancdac4e02005-06-13 15:12:33 -0700408
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700409 if (ipv6_only_sock(sctp_opt2sk(sp)))
410 return 0;
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return 1;
413}
414
415/* Checking the loopback, private and other address scopes as defined in
416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
418 *
419 * Level 0 - unusable SCTP addresses
420 * Level 1 - loopback address
421 * Level 2 - link-local addresses
422 * Level 3 - private addresses.
423 * Level 4 - global addresses
424 * For INIT and INIT-ACK address list, let L be the level of
425 * of requested destination address, sender and receiver
426 * SHOULD include all of its addresses with level greater
427 * than or equal to L.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530428 *
429 * IPv4 scoping can be controlled through sysctl option
430 * net.sctp.addr_scope_policy
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 */
432static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
433{
434 sctp_scope_t retval;
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 /* Check for unusable SCTP addresses. */
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 retval = SCTP_SCOPE_UNUSABLE;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 retval = SCTP_SCOPE_LOOPBACK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 retval = SCTP_SCOPE_LINK;
Joe Perchesb5cb2bb2007-12-16 13:46:59 -0800443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 retval = SCTP_SCOPE_PRIVATE;
447 } else {
448 retval = SCTP_SCOPE_GLOBAL;
449 }
450
451 return retval;
452}
453
454/* Returns a valid dst cache entry for the given source and destination ip
455 * addresses. If an association is passed, trys to get a dst entry with a
456 * source address that matches an address in the bind address list.
457 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000458static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
459 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000461 struct sctp_association *asoc = t->asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 struct rtable *rt;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000463 struct flowi4 *fl4 = &fl->u.ip4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 struct dst_entry *dst = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000467 union sctp_addr *daddr = &t->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 union sctp_addr dst_saddr;
469
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000470 memset(fl4, 0x0, sizeof(struct flowi4));
471 fl4->daddr = daddr->v4.sin_addr.s_addr;
472 fl4->fl4_dport = daddr->v4.sin_port;
473 fl4->flowi4_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (asoc) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
477 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400479 if (saddr) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000480 fl4->saddr = saddr->v4.sin_addr.s_addr;
481 fl4->fl4_sport = saddr->v4.sin_port;
Wei Yongjun6429d3d2010-04-30 21:42:44 -0400482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Harvey Harrison21454aa2008-10-31 00:54:56 -0700484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000485 __func__, &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000487 rt = ip_route_output_key(&init_net, fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800488 if (!IS_ERR(rt))
Changli Gaod8d1f302010-06-10 23:31:35 -0700489 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 /* If there is no association or if a source address is passed, no
492 * more validation is required.
493 */
494 if (!asoc || saddr)
495 goto out;
496
497 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 if (dst) {
500 /* Walk through the bind address list and look for a bind
501 * address that matches the source address of the returned dst.
502 */
David S. Miller18a353f42011-05-03 20:55:05 -0700503 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
Vlad Yasevich559cf712007-09-16 16:03:28 -0700504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Michio Honda8a07eb02011-04-26 20:19:36 +0900506 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
507 (laddr->state != SCTP_ADDR_SRC &&
508 !asoc->src_out_of_asoc_ok))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700509 continue;
Al Viro854d43a2006-11-20 17:06:24 -0800510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 goto out_unlock;
512 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700513 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 /* None of the bound addresses match the source address of the
516 * dst. So release it.
517 */
518 dst_release(dst);
519 dst = NULL;
520 }
521
522 /* Walk through the bind address list and try to get a dst that
523 * matches a bind address as the source address.
524 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700525 rcu_read_lock();
526 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
527 if (!laddr->valid)
528 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800529 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800530 (AF_INET == laddr->a.sa.sa_family)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000531 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
532 fl4->fl4_sport = laddr->a.v4.sin_port;
533 rt = ip_route_output_key(&init_net, fl4);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800534 if (!IS_ERR(rt)) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700535 dst = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 goto out_unlock;
537 }
538 }
539 }
540
541out_unlock:
Vlad Yasevich559cf712007-09-16 16:03:28 -0700542 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543out:
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000544 t->dst = dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (dst)
Harvey Harrison21454aa2008-10-31 00:54:56 -0700546 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
David S. Miller18a353f42011-05-03 20:55:05 -0700547 &fl4->daddr, &fl4->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 else
549 SCTP_DEBUG_PRINTK("NO ROUTE\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}
551
552/* For v4, the source address is cached in the route entry(dst). So no need
553 * to cache it separately and hence this is an empty routine.
554 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900555static void sctp_v4_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000556 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000557 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000559 union sctp_addr *saddr = &t->saddr;
560 struct rtable *rt = (struct rtable *)t->dst;
Vladislav Yasevich23ec47a2005-11-11 16:05:55 -0800561
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (rt) {
563 saddr->v4.sin_family = AF_INET;
David S. Miller902ebd32011-05-09 14:49:13 -0700564 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566}
567
568/* What interface did this skb arrive on? */
569static int sctp_v4_skb_iif(const struct sk_buff *skb)
570{
David S. Miller92101b32012-07-23 16:29:00 -0700571 return inet_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572}
573
574/* Was this packet marked by Explicit Congestion Notification? */
575static int sctp_v4_is_ce(const struct sk_buff *skb)
576{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700577 return INET_ECN_is_ce(ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
580/* Create and initialize a new sk for the socket returned by accept(). */
581static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
582 struct sctp_association *asoc)
583{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900584 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700585 sk->sk_prot);
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000586 struct inet_sock *newinet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 if (!newsk)
589 goto out;
590
591 sock_init_data(NULL, newsk);
592
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000593 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 sock_reset_flag(newsk, SOCK_ZAPPED);
595
596 newinet = inet_sk(newsk);
597
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000598 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700600 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602 if (newsk->sk_prot->init(newsk)) {
603 sk_common_release(newsk);
604 newsk = NULL;
605 }
606
607out:
608 return newsk;
609}
610
611/* Map address, empty for v4 family */
612static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
613{
614 /* Empty */
615}
616
617/* Dump the v4 addr to the seq file. */
618static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
619{
Harvey Harrison21454aa2008-10-31 00:54:56 -0700620 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621}
622
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700623static void sctp_v4_ecn_capable(struct sock *sk)
624{
625 INET_ECN_xmit(sk);
626}
627
Michio Honda9f7d6532011-04-26 19:32:51 +0900628void sctp_addr_wq_timeout_handler(unsigned long arg)
629{
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000630 struct net *net = (struct net *)arg;
Michio Honda9f7d6532011-04-26 19:32:51 +0900631 struct sctp_sockaddr_entry *addrw, *temp;
632 struct sctp_sock *sp;
633
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000634 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900635
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000636 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900637 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000638 " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
Michio Honda9f7d6532011-04-26 19:32:51 +0900639 addrw);
640
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000641#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900642 /* Now we send an ASCONF for each association */
643 /* Note. we currently don't handle link local IPv6 addressees */
644 if (addrw->a.sa.sa_family == AF_INET6) {
645 struct in6_addr *in6;
646
647 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
648 IPV6_ADDR_LINKLOCAL)
649 goto free_next;
650
651 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000652 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
Michio Honda9f7d6532011-04-26 19:32:51 +0900653 addrw->state == SCTP_ADDR_NEW) {
654 unsigned long timeo_val;
655
656 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
657 SCTP_ADDRESS_TICK_DELAY);
658 timeo_val = jiffies;
659 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000660 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900661 break;
662 }
663 }
David S. Miller5d0c90c2011-06-06 13:05:55 -0700664#endif
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000665 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900666 struct sock *sk;
667
668 sk = sctp_opt2sk(sp);
669 /* ignore bound-specific endpoints */
670 if (!sctp_is_ep_boundall(sk))
671 continue;
672 sctp_bh_lock_sock(sk);
673 if (sctp_asconf_mgmt(sp, addrw) < 0)
674 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
675 sctp_bh_unlock_sock(sk);
676 }
Daniel Halperin39d84a52012-06-18 11:04:55 +0000677#if IS_ENABLED(CONFIG_IPV6)
Michio Honda9f7d6532011-04-26 19:32:51 +0900678free_next:
Daniel Halperin39d84a52012-06-18 11:04:55 +0000679#endif
Michio Honda9f7d6532011-04-26 19:32:51 +0900680 list_del(&addrw->list);
681 kfree(addrw);
682 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000683 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900684}
685
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000686static void sctp_free_addr_wq(struct net *net)
Michio Honda9f7d6532011-04-26 19:32:51 +0900687{
688 struct sctp_sockaddr_entry *addrw;
689 struct sctp_sockaddr_entry *temp;
690
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000691 spin_lock_bh(&net->sctp.addr_wq_lock);
692 del_timer(&net->sctp.addr_wq_timer);
693 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900694 list_del(&addrw->list);
695 kfree(addrw);
696 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000697 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900698}
699
700/* lookup the entry for the same address in the addr_waitq
701 * sctp_addr_wq MUST be locked
702 */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000703static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
704 struct sctp_sockaddr_entry *addr)
Michio Honda9f7d6532011-04-26 19:32:51 +0900705{
706 struct sctp_sockaddr_entry *addrw;
707
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000708 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900709 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
710 continue;
711 if (addrw->a.sa.sa_family == AF_INET) {
712 if (addrw->a.v4.sin_addr.s_addr ==
713 addr->a.v4.sin_addr.s_addr)
714 return addrw;
715 } else if (addrw->a.sa.sa_family == AF_INET6) {
716 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
717 &addr->a.v6.sin6_addr))
718 return addrw;
719 }
720 }
721 return NULL;
722}
723
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000724void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
Michio Honda9f7d6532011-04-26 19:32:51 +0900725{
726 struct sctp_sockaddr_entry *addrw;
727 unsigned long timeo_val;
728
729 /* first, we check if an opposite message already exist in the queue.
730 * If we found such message, it is removed.
731 * This operation is a bit stupid, but the DHCP client attaches the
732 * new address after a couple of addition and deletion of that address
733 */
734
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000735 spin_lock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900736 /* Offsets existing events in addr_wq */
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000737 addrw = sctp_addr_wq_lookup(net, addr);
Michio Honda9f7d6532011-04-26 19:32:51 +0900738 if (addrw) {
739 if (addrw->state != cmd) {
740 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
741 " in wq %p\n", addrw->state, &addrw->a,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000742 &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900743 list_del(&addrw->list);
744 kfree(addrw);
745 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000746 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900747 return;
748 }
749
750 /* OK, we have to add the new address to the wait queue */
751 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
752 if (addrw == NULL) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000753 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900754 return;
755 }
756 addrw->state = cmd;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000757 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900758 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000759 " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
Michio Honda9f7d6532011-04-26 19:32:51 +0900760
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000761 if (!timer_pending(&net->sctp.addr_wq_timer)) {
Michio Honda9f7d6532011-04-26 19:32:51 +0900762 timeo_val = jiffies;
763 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000764 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
Michio Honda9f7d6532011-04-26 19:32:51 +0900765 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000766 spin_unlock_bh(&net->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +0900767}
768
Vlad Yasevich29303542007-09-16 16:02:12 -0700769/* Event handler for inet address addition/deletion events.
770 * The sctp_local_addr_list needs to be protocted by a spin lock since
771 * multiple notifiers (say IPv4 and IPv6) may be running at the same
772 * time and thus corrupt the list.
773 * The reader side is protected with RCU.
774 */
Adrian Bunk24123182006-12-20 16:08:22 -0800775static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
776 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800778 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700779 struct sctp_sockaddr_entry *addr = NULL;
780 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000781 struct net *net = dev_net(ifa->ifa_dev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700782 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800784 switch (ev) {
785 case NETDEV_UP:
786 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
787 if (addr) {
788 addr->a.v4.sin_family = AF_INET;
789 addr->a.v4.sin_port = 0;
790 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
Vlad Yasevich29303542007-09-16 16:02:12 -0700791 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000792 spin_lock_bh(&net->sctp.local_addr_lock);
793 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
794 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
795 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800796 }
797 break;
798 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000799 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700800 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000801 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700802 if (addr->a.sa.sa_family == AF_INET &&
803 addr->a.v4.sin_addr.s_addr ==
804 ifa->ifa_local) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000805 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700806 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700807 addr->valid = 0;
808 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800809 break;
810 }
811 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000812 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700813 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800814 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800815 break;
816 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 return NOTIFY_DONE;
819}
820
821/*
822 * Initialize the control inode/socket with a control endpoint data
823 * structure. This endpoint is reserved exclusively for the OOTB processing.
824 */
825static int sctp_ctl_sock_init(void)
826{
827 int err;
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800828 sa_family_t family = PF_INET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 if (sctp_get_pf_specific(PF_INET6))
831 family = PF_INET6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Denis V. Luneveee4fe42008-04-03 14:27:58 -0700833 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
Denis V. Lunev56772422008-04-03 14:28:30 -0700834 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
Brian Haleyfb13d9f2009-03-04 03:20:26 -0800835
836 /* If IPv6 socket could not be created, try the IPv4 socket */
837 if (err < 0 && family == PF_INET6)
838 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
839 SOCK_SEQPACKET, IPPROTO_SCTP,
840 &init_net);
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 if (err < 0) {
Joe Perches145ce502010-08-24 13:21:08 +0000843 pr_err("Failed to create the SCTP control socket\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 return err;
845 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 return 0;
847}
848
849/* Register address family specific functions. */
850int sctp_register_af(struct sctp_af *af)
851{
852 switch (af->sa_family) {
853 case AF_INET:
854 if (sctp_af_v4_specific)
855 return 0;
856 sctp_af_v4_specific = af;
857 break;
858 case AF_INET6:
859 if (sctp_af_v6_specific)
860 return 0;
861 sctp_af_v6_specific = af;
862 break;
863 default:
864 return 0;
865 }
866
867 INIT_LIST_HEAD(&af->list);
868 list_add_tail(&af->list, &sctp_address_families);
869 return 1;
870}
871
872/* Get the table of functions for manipulating a particular address
873 * family.
874 */
875struct sctp_af *sctp_get_af_specific(sa_family_t family)
876{
877 switch (family) {
878 case AF_INET:
879 return sctp_af_v4_specific;
880 case AF_INET6:
881 return sctp_af_v6_specific;
882 default:
883 return NULL;
884 }
885}
886
887/* Common code to initialize a AF_INET msg_name. */
888static void sctp_inet_msgname(char *msgname, int *addr_len)
889{
890 struct sockaddr_in *sin;
891
892 sin = (struct sockaddr_in *)msgname;
893 *addr_len = sizeof(struct sockaddr_in);
894 sin->sin_family = AF_INET;
895 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
896}
897
898/* Copy the primary address of the peer primary address as the msg_name. */
899static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
900 int *addr_len)
901{
902 struct sockaddr_in *sin, *sinfrom;
903
904 if (msgname) {
905 struct sctp_association *asoc;
906
907 asoc = event->asoc;
908 sctp_inet_msgname(msgname, addr_len);
909 sin = (struct sockaddr_in *)msgname;
910 sinfrom = &asoc->peer.primary_addr.v4;
911 sin->sin_port = htons(asoc->peer.port);
912 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
913 }
914}
915
916/* Initialize and copy out a msgname from an inbound skb. */
917static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
918{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 if (msgname) {
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300920 struct sctphdr *sh = sctp_hdr(skb);
921 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 sctp_inet_msgname(msgname, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 sin->sin_port = sh->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700925 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 }
927}
928
929/* Do we support this AF? */
930static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
931{
932 /* PF_INET only supports AF_INET addresses. */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000933 return AF_INET == family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934}
935
936/* Address matching with wildcards allowed. */
937static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
938 const union sctp_addr *addr2,
939 struct sctp_sock *opt)
940{
941 /* PF_INET only supports AF_INET addresses. */
942 if (addr1->sa.sa_family != addr2->sa.sa_family)
943 return 0;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700944 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
945 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 return 1;
947 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
948 return 1;
949
950 return 0;
951}
952
953/* Verify that provided sockaddr looks bindable. Common verification has
954 * already been taken care of.
955 */
956static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
957{
958 return sctp_v4_available(addr, opt);
959}
960
961/* Verify that sockaddr looks sendable. Common verification has already
962 * been taken care of.
963 */
964static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
965{
966 return 1;
967}
968
969/* Fill in Supported Address Type information for INIT and INIT-ACK
970 * chunks. Returns number of addresses supported.
971 */
972static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800973 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
975 types[0] = SCTP_PARAM_IPV4_ADDRESS;
976 return 1;
977}
978
979/* Wrapper routine that calls the ip transmit routine. */
980static inline int sctp_v4_xmit(struct sk_buff *skb,
Herbert Xuf8803742008-08-03 21:15:08 -0700981 struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982{
Herbert Xuf8803742008-08-03 21:15:08 -0700983 struct inet_sock *inet = inet_sk(skb->sk);
984
Harvey Harrison21454aa2008-10-31 00:54:56 -0700985 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800986 __func__, skb, skb->len,
David S. Miller7ef73bc2011-05-08 21:14:41 -0700987 &transport->fl.u.ip4.saddr,
988 &transport->fl.u.ip4.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Herbert Xuf8803742008-08-03 21:15:08 -0700990 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
991 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
992
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
David S. Millerd9d8da82011-05-06 22:23:20 -0700994 return ip_queue_xmit(skb, &transport->fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
Neil Horman15efbe72008-02-15 09:53:59 -0500997static struct sctp_af sctp_af_inet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999static struct sctp_pf sctp_pf_inet = {
1000 .event_msgname = sctp_inet_event_msgname,
1001 .skb_msgname = sctp_inet_skb_msgname,
1002 .af_supported = sctp_inet_af_supported,
1003 .cmp_addr = sctp_inet_cmp_addr,
1004 .bind_verify = sctp_inet_bind_verify,
1005 .send_verify = sctp_inet_send_verify,
1006 .supported_addrs = sctp_inet_supported_addrs,
1007 .create_accept_sk = sctp_v4_create_accept_sk,
1008 .addr_v4map = sctp_v4_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -05001009 .af = &sctp_af_inet
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010};
1011
1012/* Notifier for inetaddr addition/deletion events. */
1013static struct notifier_block sctp_inetaddr_notifier = {
1014 .notifier_call = sctp_inetaddr_event,
1015};
1016
1017/* Socket operations. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001018static const struct proto_ops inet_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001019 .family = PF_INET,
1020 .owner = THIS_MODULE,
1021 .release = inet_release, /* Needs to be wrapped... */
1022 .bind = inet_bind,
1023 .connect = inet_dgram_connect,
1024 .socketpair = sock_no_socketpair,
1025 .accept = inet_accept,
1026 .getname = inet_getname, /* Semantics are different. */
1027 .poll = sctp_poll,
1028 .ioctl = inet_ioctl,
1029 .listen = sctp_inet_listen,
1030 .shutdown = inet_shutdown, /* Looks harmless. */
1031 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1032 .getsockopt = sock_common_getsockopt,
1033 .sendmsg = inet_sendmsg,
1034 .recvmsg = sock_common_recvmsg,
1035 .mmap = sock_no_mmap,
1036 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001037#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001038 .compat_setsockopt = compat_sock_common_setsockopt,
1039 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001040#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041};
1042
1043/* Registration with AF_INET family. */
1044static struct inet_protosw sctp_seqpacket_protosw = {
1045 .type = SOCK_SEQPACKET,
1046 .protocol = IPPROTO_SCTP,
1047 .prot = &sctp_prot,
1048 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 .no_check = 0,
1050 .flags = SCTP_PROTOSW_FLAG
1051};
1052static struct inet_protosw sctp_stream_protosw = {
1053 .type = SOCK_STREAM,
1054 .protocol = IPPROTO_SCTP,
1055 .prot = &sctp_prot,
1056 .ops = &inet_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 .no_check = 0,
1058 .flags = SCTP_PROTOSW_FLAG
1059};
1060
1061/* Register with IP layer. */
Alexey Dobriyan32613092009-09-14 12:21:47 +00001062static const struct net_protocol sctp_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 .handler = sctp_rcv,
1064 .err_handler = sctp_v4_err,
1065 .no_policy = 1,
1066};
1067
1068/* IPv4 address related functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001069static struct sctp_af sctp_af_inet = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001070 .sa_family = AF_INET,
1071 .sctp_xmit = sctp_v4_xmit,
1072 .setsockopt = ip_setsockopt,
1073 .getsockopt = ip_getsockopt,
1074 .get_dst = sctp_v4_get_dst,
1075 .get_saddr = sctp_v4_get_saddr,
1076 .copy_addrlist = sctp_v4_copy_addrlist,
1077 .from_skb = sctp_v4_from_skb,
1078 .from_sk = sctp_v4_from_sk,
1079 .to_sk_saddr = sctp_v4_to_sk_saddr,
1080 .to_sk_daddr = sctp_v4_to_sk_daddr,
1081 .from_addr_param = sctp_v4_from_addr_param,
1082 .to_addr_param = sctp_v4_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001083 .cmp_addr = sctp_v4_cmp_addr,
1084 .addr_valid = sctp_v4_addr_valid,
1085 .inaddr_any = sctp_v4_inaddr_any,
1086 .is_any = sctp_v4_is_any,
1087 .available = sctp_v4_available,
1088 .scope = sctp_v4_scope,
1089 .skb_iif = sctp_v4_skb_iif,
1090 .is_ce = sctp_v4_is_ce,
1091 .seq_dump_addr = sctp_v4_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001092 .ecn_capable = sctp_v4_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001093 .net_header_len = sizeof(struct iphdr),
1094 .sockaddr_len = sizeof(struct sockaddr_in),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001095#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001096 .compat_setsockopt = compat_ip_setsockopt,
1097 .compat_getsockopt = compat_ip_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001098#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099};
1100
1101struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1102
1103 switch (family) {
1104 case PF_INET:
1105 return sctp_pf_inet_specific;
1106 case PF_INET6:
1107 return sctp_pf_inet6_specific;
1108 default:
1109 return NULL;
1110 }
1111}
1112
1113/* Register the PF specific function table. */
1114int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1115{
1116 switch (family) {
1117 case PF_INET:
1118 if (sctp_pf_inet_specific)
1119 return 0;
1120 sctp_pf_inet_specific = pf;
1121 break;
1122 case PF_INET6:
1123 if (sctp_pf_inet6_specific)
1124 return 0;
1125 sctp_pf_inet6_specific = pf;
1126 break;
1127 default:
1128 return 0;
1129 }
1130 return 1;
1131}
1132
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001133static inline int init_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134{
Tejun Heo7d720c32010-02-16 15:20:26 +00001135 return snmp_mib_init((void __percpu **)sctp_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00001136 sizeof(struct sctp_mib),
1137 __alignof__(struct sctp_mib));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138}
1139
YOSHIFUJI Hideaki996b1db2008-04-10 03:50:13 -07001140static inline void cleanup_sctp_mibs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
Tejun Heo7d720c32010-02-16 15:20:26 +00001142 snmp_mib_free((void __percpu **)sctp_statistics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143}
1144
Vlad Yasevich270637a2008-03-20 15:17:14 -07001145static void sctp_v4_pf_init(void)
1146{
1147 /* Initialize the SCTP specific PF functions. */
1148 sctp_register_pf(&sctp_pf_inet, PF_INET);
1149 sctp_register_af(&sctp_af_inet);
1150}
1151
1152static void sctp_v4_pf_exit(void)
1153{
1154 list_del(&sctp_af_inet.list);
1155}
1156
1157static int sctp_v4_protosw_init(void)
1158{
1159 int rc;
1160
1161 rc = proto_register(&sctp_prot, 1);
1162 if (rc)
1163 return rc;
1164
1165 /* Register SCTP(UDP and TCP style) with socket layer. */
1166 inet_register_protosw(&sctp_seqpacket_protosw);
1167 inet_register_protosw(&sctp_stream_protosw);
1168
1169 return 0;
1170}
1171
1172static void sctp_v4_protosw_exit(void)
1173{
1174 inet_unregister_protosw(&sctp_stream_protosw);
1175 inet_unregister_protosw(&sctp_seqpacket_protosw);
1176 proto_unregister(&sctp_prot);
1177}
1178
1179static int sctp_v4_add_protocol(void)
1180{
1181 /* Register notifier for inet address additions/deletions. */
1182 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1183
1184 /* Register SCTP with inet layer. */
1185 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1186 return -EAGAIN;
1187
1188 return 0;
1189}
1190
1191static void sctp_v4_del_protocol(void)
1192{
1193 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1194 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1195}
1196
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001197static int sctp_net_init(struct net *net)
1198{
1199 /* Initialize the local address list. */
1200 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1201 spin_lock_init(&net->sctp.local_addr_lock);
1202 sctp_get_local_addr_list(net);
1203
1204 /* Initialize the address event list */
1205 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1206 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1207 spin_lock_init(&net->sctp.addr_wq_lock);
1208 net->sctp.addr_wq_timer.expires = 0;
1209 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1210 (unsigned long)net);
1211
1212 return 0;
1213}
1214
1215static void sctp_net_exit(struct net *net)
1216{
1217 /* Free the local address list */
1218 sctp_free_addr_wq(net);
1219 sctp_free_local_addr_list(net);
1220}
1221
1222static struct pernet_operations sctp_net_ops = {
1223 .init = sctp_net_init,
1224 .exit = sctp_net_exit,
1225};
1226
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227/* Initialize the universe into something sensible. */
1228SCTP_STATIC __init int sctp_init(void)
1229{
1230 int i;
1231 int status = -EINVAL;
1232 unsigned long goal;
Neil Horman4d93df02007-08-15 16:07:44 -07001233 unsigned long limit;
1234 int max_share;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 int order;
1236
1237 /* SCTP_DEBUG sanity check. */
1238 if (!sctp_sanity_check())
1239 goto out;
1240
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001241 /* Allocate bind_bucket and chunk caches. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 status = -ENOBUFS;
1243 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1244 sizeof(struct sctp_bind_bucket),
1245 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001246 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 if (!sctp_bucket_cachep)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001248 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
1250 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1251 sizeof(struct sctp_chunk),
1252 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001253 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (!sctp_chunk_cachep)
1255 goto err_chunk_cachep;
1256
1257 /* Allocate and initialise sctp mibs. */
1258 status = init_sctp_mibs();
1259 if (status)
1260 goto err_init_mibs;
1261
1262 /* Initialize proc fs directory. */
1263 status = sctp_proc_init();
1264 if (status)
1265 goto err_init_proc;
1266
1267 /* Initialize object count debugging. */
1268 sctp_dbg_objcnt_init();
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 /*
1271 * 14. Suggested SCTP Protocol Parameter Values
1272 */
1273 /* The following protocol parameters are RECOMMENDED: */
1274 /* RTO.Initial - 3 seconds */
1275 sctp_rto_initial = SCTP_RTO_INITIAL;
1276 /* RTO.Min - 1 second */
1277 sctp_rto_min = SCTP_RTO_MIN;
1278 /* RTO.Max - 60 seconds */
1279 sctp_rto_max = SCTP_RTO_MAX;
1280 /* RTO.Alpha - 1/8 */
1281 sctp_rto_alpha = SCTP_RTO_ALPHA;
1282 /* RTO.Beta - 1/4 */
1283 sctp_rto_beta = SCTP_RTO_BETA;
1284
1285 /* Valid.Cookie.Life - 60 seconds */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07001286 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
1288 /* Whether Cookie Preservative is enabled(1) or not(0) */
1289 sctp_cookie_preserve_enable = 1;
1290
1291 /* Max.Burst - 4 */
Vlad Yasevich70331572007-03-23 11:34:36 -07001292 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
1294 /* Association.Max.Retrans - 10 attempts
1295 * Path.Max.Retrans - 5 attempts (per destination address)
1296 * Max.Init.Retransmits - 8 attempts
1297 */
1298 sctp_max_retrans_association = 10;
1299 sctp_max_retrans_path = 5;
1300 sctp_max_retrans_init = 8;
1301
Neil Horman4eb701d2005-04-28 12:02:04 -07001302 /* Sendbuffer growth - do per-socket accounting */
1303 sctp_sndbuf_policy = 0;
1304
Neil Horman049b3ff2005-11-11 16:08:24 -08001305 /* Rcvbuffer growth - do per-socket accounting */
1306 sctp_rcvbuf_policy = 0;
1307
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 /* HB.interval - 30 seconds */
Vlad Yasevich2f85a422005-06-28 13:24:23 -07001309 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1310
1311 /* delayed SACK timeout */
1312 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314 /* Implementation specific variables. */
1315
1316 /* Initialize default stream count setup information. */
1317 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1318 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1319
Xi Wang2692ba62011-12-16 12:44:15 +00001320 /* Initialize maximum autoclose timeout. */
1321 sctp_max_autoclose = INT_MAX / HZ;
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 /* Initialize handle used for association ids. */
1324 idr_init(&sctp_assocs_id);
1325
Eric Dumazetf03d78d2011-07-07 00:27:05 -07001326 limit = nr_free_buffer_pages() / 8;
Neil Horman4d93df02007-08-15 16:07:44 -07001327 limit = max(limit, 128UL);
1328 sysctl_sctp_mem[0] = limit / 4 * 3;
1329 sysctl_sctp_mem[1] = limit;
1330 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1331
1332 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1333 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1334 max_share = min(4UL*1024*1024, limit);
1335
Vlad Yasevich845525a2008-07-18 23:08:21 -07001336 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
Eric Dumazet87fb4b72011-10-13 07:28:54 +00001337 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
Neil Horman4d93df02007-08-15 16:07:44 -07001338 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1339
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001340 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
Neil Horman4d93df02007-08-15 16:07:44 -07001341 sysctl_sctp_wmem[1] = 16*1024;
1342 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 /* Size and allocate the association hash table.
1345 * The methodology is similar to that of the tcp hash tables.
1346 */
Jan Beulich44813742009-09-21 17:03:05 -07001347 if (totalram_pages >= (128 * 1024))
1348 goal = totalram_pages >> (22 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 else
Jan Beulich44813742009-09-21 17:03:05 -07001350 goal = totalram_pages >> (24 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352 for (order = 0; (1UL << order) < goal; order++)
1353 ;
1354
1355 do {
1356 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1357 sizeof(struct sctp_hashbucket);
1358 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1359 continue;
1360 sctp_assoc_hashtable = (struct sctp_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001361 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 } while (!sctp_assoc_hashtable && --order > 0);
1363 if (!sctp_assoc_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001364 pr_err("Failed association hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 status = -ENOMEM;
1366 goto err_ahash_alloc;
1367 }
1368 for (i = 0; i < sctp_assoc_hashsize; i++) {
1369 rwlock_init(&sctp_assoc_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001370 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 }
1372
1373 /* Allocate and initialize the endpoint hash table. */
1374 sctp_ep_hashsize = 64;
1375 sctp_ep_hashtable = (struct sctp_hashbucket *)
1376 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1377 if (!sctp_ep_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001378 pr_err("Failed endpoint_hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 status = -ENOMEM;
1380 goto err_ehash_alloc;
1381 }
1382 for (i = 0; i < sctp_ep_hashsize; i++) {
1383 rwlock_init(&sctp_ep_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001384 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 }
1386
1387 /* Allocate and initialize the SCTP port hash table. */
1388 do {
1389 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1390 sizeof(struct sctp_bind_hashbucket);
1391 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1392 continue;
1393 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
David S. Millera84b50c2011-03-30 17:51:36 -07001394 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 } while (!sctp_port_hashtable && --order > 0);
1396 if (!sctp_port_hashtable) {
Joe Perches145ce502010-08-24 13:21:08 +00001397 pr_err("Failed bind hash alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 status = -ENOMEM;
1399 goto err_bhash_alloc;
1400 }
1401 for (i = 0; i < sctp_port_hashsize; i++) {
1402 spin_lock_init(&sctp_port_hashtable[i].lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05001403 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 }
1405
Joe Perches145ce502010-08-24 13:21:08 +00001406 pr_info("Hash tables configured (established %d bind %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 sctp_assoc_hashsize, sctp_port_hashsize);
1408
1409 /* Disable ADDIP by default. */
1410 sctp_addip_enable = 0;
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04001411 sctp_addip_noauth = 0;
Michio Honda9f7d6532011-04-26 19:32:51 +09001412 sctp_default_auto_asconf = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414 /* Enable PR-SCTP by default. */
1415 sctp_prsctp_enable = 1;
1416
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -07001417 /* Disable AUTH by default. */
1418 sctp_auth_enable = 0;
1419
Bhaskar Dutta72388432009-09-03 17:25:47 +05301420 /* Set SCOPE policy to enabled */
1421 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1422
Vlad Yasevich90f2f532009-11-23 15:53:57 -05001423 /* Set the default rwnd update threshold */
1424 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 sctp_sysctl_register();
1427
1428 INIT_LIST_HEAD(&sctp_address_families);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001429 sctp_v4_pf_init();
1430 sctp_v6_pf_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431
Vlad Yasevich270637a2008-03-20 15:17:14 -07001432 status = sctp_v4_protosw_init();
1433
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001434 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001435 goto err_protosw_init;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001436
Vlad Yasevich270637a2008-03-20 15:17:14 -07001437 status = sctp_v6_protosw_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 if (status)
Vlad Yasevich270637a2008-03-20 15:17:14 -07001439 goto err_v6_protosw_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
1441 /* Initialize the control inode/socket for handling OOTB packets. */
1442 if ((status = sctp_ctl_sock_init())) {
Joe Perches145ce502010-08-24 13:21:08 +00001443 pr_err("Failed to initialize the SCTP control sock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 goto err_ctl_sock_init;
1445 }
1446
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001447 status = register_pernet_subsys(&sctp_net_ops);
1448 if (status)
1449 goto err_register_pernet_subsys;
1450
Vlad Yasevich270637a2008-03-20 15:17:14 -07001451 status = sctp_v4_add_protocol();
1452 if (status)
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001453 goto err_add_protocol;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001454
1455 /* Register SCTP with inet6 layer. */
1456 status = sctp_v6_add_protocol();
1457 if (status)
1458 goto err_v6_add_protocol;
1459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 status = 0;
1461out:
1462 return status;
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001463err_v6_add_protocol:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001464 sctp_v4_del_protocol();
Vlad Yasevichd1dd5242009-03-02 06:46:50 +00001465err_add_protocol:
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001466 unregister_pernet_subsys(&sctp_net_ops);
1467err_register_pernet_subsys:
Denis V. Lunev56772422008-04-03 14:28:30 -07001468 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469err_ctl_sock_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001470 sctp_v6_protosw_exit();
1471err_v6_protosw_init:
1472 sctp_v4_protosw_exit();
1473err_protosw_init:
Vlad Yasevich270637a2008-03-20 15:17:14 -07001474 sctp_v4_pf_exit();
1475 sctp_v6_pf_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 free_pages((unsigned long)sctp_port_hashtable,
1478 get_order(sctp_port_hashsize *
1479 sizeof(struct sctp_bind_hashbucket)));
1480err_bhash_alloc:
1481 kfree(sctp_ep_hashtable);
1482err_ehash_alloc:
1483 free_pages((unsigned long)sctp_assoc_hashtable,
1484 get_order(sctp_assoc_hashsize *
1485 sizeof(struct sctp_hashbucket)));
1486err_ahash_alloc:
1487 sctp_dbg_objcnt_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 sctp_proc_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001489err_init_proc:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 cleanup_sctp_mibs();
1491err_init_mibs:
1492 kmem_cache_destroy(sctp_chunk_cachep);
1493err_chunk_cachep:
1494 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 goto out;
1496}
1497
1498/* Exit handler for the SCTP protocol. */
1499SCTP_STATIC __exit void sctp_exit(void)
1500{
1501 /* BUG. This should probably do something useful like clean
1502 * up all the remaining associations and all that memory.
1503 */
1504
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001505 /* Unregister with inet6/inet layers. */
1506 sctp_v6_del_protocol();
Vlad Yasevich270637a2008-03-20 15:17:14 -07001507 sctp_v4_del_protocol();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
1509 /* Free the control endpoint. */
Denis V. Lunev56772422008-04-03 14:28:30 -07001510 inet_ctl_sock_destroy(sctp_ctl_sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Eric W. Biederman4db67e82012-08-06 08:42:04 +00001512 unregister_pernet_subsys(&sctp_net_ops);
1513
Vlad Yasevich270637a2008-03-20 15:17:14 -07001514 /* Free protosw registrations */
1515 sctp_v6_protosw_exit();
1516 sctp_v4_protosw_exit();
1517
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001518 /* Unregister with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001519 sctp_v6_pf_exit();
1520 sctp_v4_pf_exit();
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001521
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 sctp_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
1524 free_pages((unsigned long)sctp_assoc_hashtable,
1525 get_order(sctp_assoc_hashsize *
1526 sizeof(struct sctp_hashbucket)));
1527 kfree(sctp_ep_hashtable);
1528 free_pages((unsigned long)sctp_port_hashtable,
1529 get_order(sctp_port_hashsize *
1530 sizeof(struct sctp_bind_hashbucket)));
1531
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 sctp_dbg_objcnt_exit();
1533 sctp_proc_exit();
1534 cleanup_sctp_mibs();
1535
Jesper Dangaard Brouereaa184a2009-06-08 03:11:43 +00001536 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1537
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001538 kmem_cache_destroy(sctp_chunk_cachep);
1539 kmem_cache_destroy(sctp_bucket_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540}
1541
1542module_init(sctp_init);
1543module_exit(sctp_exit);
1544
Arnaldo Carvalho de Melobb97d312005-08-09 20:19:14 -07001545/*
1546 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1547 */
1548MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
Sridhar Samudrala882a3822006-12-13 16:33:35 -08001549MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1551MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
Lucas Nussbaum06e86802009-02-13 08:33:41 +00001552module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1553MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554MODULE_LICENSE("GPL");