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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (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 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * Initialization/cleanup for SCTP protocol support. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * 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 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * 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 | ||
145ce502 JP |
49 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
50 | ||
1da177e4 LT |
51 | #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> | |
4d93df0a | 56 | #include <linux/bootmem.h> |
845525a6 VY |
57 | #include <linux/highmem.h> |
58 | #include <linux/swap.h> | |
5a0e3ad6 | 59 | #include <linux/slab.h> |
457c4cbc | 60 | #include <net/net_namespace.h> |
1da177e4 LT |
61 | #include <net/protocol.h> |
62 | #include <net/ip.h> | |
63 | #include <net/ipv6.h> | |
14c85021 | 64 | #include <net/route.h> |
1da177e4 LT |
65 | #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. */ | |
4cbf1cae | 71 | struct sctp_globals sctp_globals __read_mostly; |
ba89966c | 72 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
1da177e4 | 73 | |
c4e85f82 FW |
74 | #ifdef CONFIG_PROC_FS |
75 | struct proc_dir_entry *proc_net_sctp; | |
76 | #endif | |
77 | ||
1da177e4 LT |
78 | struct idr sctp_assocs_id; |
79 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
80 | ||
1da177e4 LT |
81 | static struct sctp_pf *sctp_pf_inet6_specific; |
82 | static struct sctp_pf *sctp_pf_inet_specific; | |
83 | static struct sctp_af *sctp_af_v4_specific; | |
84 | static struct sctp_af *sctp_af_v6_specific; | |
85 | ||
e18b890b CL |
86 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
87 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 88 | |
8d987e5c | 89 | long sysctl_sctp_mem[3]; |
007e3936 VY |
90 | int sysctl_sctp_rmem[3]; |
91 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 92 | |
1da177e4 LT |
93 | /* Set up the proc fs entry for the SCTP protocol. */ |
94 | static __init int sctp_proc_init(void) | |
95 | { | |
1748376b ED |
96 | if (percpu_counter_init(&sctp_sockets_allocated, 0)) |
97 | goto out_nomem; | |
c4e85f82 | 98 | #ifdef CONFIG_PROC_FS |
1da177e4 | 99 | if (!proc_net_sctp) { |
99b76233 AD |
100 | proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); |
101 | if (!proc_net_sctp) | |
1748376b | 102 | goto out_free_percpu; |
1da177e4 LT |
103 | } |
104 | ||
105 | if (sctp_snmp_proc_init()) | |
80896a35 | 106 | goto out_snmp_proc_init; |
1da177e4 | 107 | if (sctp_eps_proc_init()) |
80896a35 | 108 | goto out_eps_proc_init; |
1da177e4 | 109 | if (sctp_assocs_proc_init()) |
80896a35 | 110 | goto out_assocs_proc_init; |
20c2c1fd | 111 | if (sctp_remaddr_proc_init()) |
caea902f | 112 | goto out_remaddr_proc_init; |
1da177e4 LT |
113 | |
114 | return 0; | |
115 | ||
caea902f | 116 | out_remaddr_proc_init: |
3d00fb9e | 117 | sctp_assocs_proc_exit(); |
80896a35 WY |
118 | out_assocs_proc_init: |
119 | sctp_eps_proc_exit(); | |
120 | out_eps_proc_init: | |
121 | sctp_snmp_proc_exit(); | |
122 | out_snmp_proc_init: | |
123 | if (proc_net_sctp) { | |
124 | proc_net_sctp = NULL; | |
125 | remove_proc_entry("sctp", init_net.proc_net); | |
126 | } | |
1748376b ED |
127 | out_free_percpu: |
128 | percpu_counter_destroy(&sctp_sockets_allocated); | |
c4e85f82 FW |
129 | #else |
130 | return 0; | |
131 | #endif /* CONFIG_PROC_FS */ | |
157653ce RD |
132 | |
133 | out_nomem: | |
134 | return -ENOMEM; | |
1da177e4 LT |
135 | } |
136 | ||
d808ad9a | 137 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
138 | * Note: Do not make this __exit as it is used in the init error |
139 | * path. | |
140 | */ | |
141 | static void sctp_proc_exit(void) | |
142 | { | |
c4e85f82 | 143 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
144 | sctp_snmp_proc_exit(); |
145 | sctp_eps_proc_exit(); | |
146 | sctp_assocs_proc_exit(); | |
20c2c1fd | 147 | sctp_remaddr_proc_exit(); |
1da177e4 LT |
148 | |
149 | if (proc_net_sctp) { | |
150 | proc_net_sctp = NULL; | |
457c4cbc | 151 | remove_proc_entry("sctp", init_net.proc_net); |
1da177e4 | 152 | } |
c4e85f82 | 153 | #endif |
418372b0 | 154 | percpu_counter_destroy(&sctp_sockets_allocated); |
1da177e4 LT |
155 | } |
156 | ||
157 | /* Private helper to extract ipv4 address and stash them in | |
158 | * the protocol structure. | |
159 | */ | |
160 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
161 | struct net_device *dev) | |
162 | { | |
163 | struct in_device *in_dev; | |
164 | struct in_ifaddr *ifa; | |
165 | struct sctp_sockaddr_entry *addr; | |
166 | ||
167 | rcu_read_lock(); | |
e5ed6399 | 168 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
169 | rcu_read_unlock(); |
170 | return; | |
171 | } | |
172 | ||
173 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
174 | /* Add the address to the local list. */ | |
175 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
176 | if (addr) { | |
2a6fd78a AV |
177 | addr->a.v4.sin_family = AF_INET; |
178 | addr->a.v4.sin_port = 0; | |
179 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
180 | addr->valid = 1; |
181 | INIT_LIST_HEAD(&addr->list); | |
1da177e4 LT |
182 | list_add_tail(&addr->list, addrlist); |
183 | } | |
184 | } | |
185 | ||
186 | rcu_read_unlock(); | |
187 | } | |
188 | ||
189 | /* Extract our IP addresses from the system and stash them in the | |
190 | * protocol structure. | |
191 | */ | |
4db67e80 | 192 | static void sctp_get_local_addr_list(struct net *net) |
1da177e4 LT |
193 | { |
194 | struct net_device *dev; | |
195 | struct list_head *pos; | |
196 | struct sctp_af *af; | |
197 | ||
c6d14c84 | 198 | rcu_read_lock(); |
4db67e80 | 199 | for_each_netdev_rcu(net, dev) { |
1da177e4 LT |
200 | __list_for_each(pos, &sctp_address_families) { |
201 | af = list_entry(pos, struct sctp_af, list); | |
4db67e80 | 202 | af->copy_addrlist(&net->sctp.local_addr_list, dev); |
1da177e4 LT |
203 | } |
204 | } | |
c6d14c84 | 205 | rcu_read_unlock(); |
1da177e4 LT |
206 | } |
207 | ||
1da177e4 | 208 | /* Free the existing local addresses. */ |
4db67e80 | 209 | static void sctp_free_local_addr_list(struct net *net) |
1da177e4 LT |
210 | { |
211 | struct sctp_sockaddr_entry *addr; | |
212 | struct list_head *pos, *temp; | |
213 | ||
4db67e80 | 214 | list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { |
1da177e4 LT |
215 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
216 | list_del(pos); | |
217 | kfree(addr); | |
218 | } | |
219 | } | |
220 | ||
1da177e4 | 221 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
4db67e80 EB |
222 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, |
223 | sctp_scope_t scope, gfp_t gfp, int copy_flags) | |
1da177e4 LT |
224 | { |
225 | struct sctp_sockaddr_entry *addr; | |
226 | int error = 0; | |
1da177e4 | 227 | |
29303547 | 228 | rcu_read_lock(); |
4db67e80 | 229 | list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { |
29303547 VY |
230 | if (!addr->valid) |
231 | continue; | |
6244be4e | 232 | if (sctp_in_scope(&addr->a, scope)) { |
1da177e4 LT |
233 | /* Now that the address is in scope, check to see if |
234 | * the address type is really supported by the local | |
235 | * sock as well as the remote peer. | |
236 | */ | |
6244be4e | 237 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 238 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 239 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
240 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
241 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
242 | error = sctp_add_bind_addr(bp, &addr->a, |
243 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
244 | if (error) |
245 | goto end_copy; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
250 | end_copy: | |
29303547 | 251 | rcu_read_unlock(); |
1da177e4 LT |
252 | return error; |
253 | } | |
254 | ||
255 | /* Initialize a sctp_addr from in incoming skb. */ | |
256 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
257 | int is_saddr) | |
258 | { | |
259 | void *from; | |
d55c41b1 | 260 | __be16 *port; |
1da177e4 LT |
261 | struct sctphdr *sh; |
262 | ||
263 | port = &addr->v4.sin_port; | |
264 | addr->v4.sin_family = AF_INET; | |
265 | ||
2c0fd387 | 266 | sh = sctp_hdr(skb); |
1da177e4 | 267 | if (is_saddr) { |
d55c41b1 | 268 | *port = sh->source; |
eddc9ec5 | 269 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 270 | } else { |
d55c41b1 | 271 | *port = sh->dest; |
eddc9ec5 | 272 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
273 | } |
274 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
275 | } | |
276 | ||
277 | /* Initialize an sctp_addr from a socket. */ | |
278 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
279 | { | |
280 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 281 | addr->v4.sin_port = 0; |
c720c7e8 | 282 | addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; |
1da177e4 LT |
283 | } |
284 | ||
285 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
286 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
287 | { | |
c720c7e8 | 288 | inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
289 | } |
290 | ||
291 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
292 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
293 | { | |
c720c7e8 | 294 | inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
295 | } |
296 | ||
297 | /* Initialize a sctp_addr from an address parameter. */ | |
298 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
299 | union sctp_addr_param *param, | |
dd86d136 | 300 | __be16 port, int iif) |
1da177e4 LT |
301 | { |
302 | addr->v4.sin_family = AF_INET; | |
303 | addr->v4.sin_port = port; | |
304 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
305 | } | |
306 | ||
307 | /* Initialize an address parameter from a sctp_addr and return the length | |
308 | * of the address parameter. | |
309 | */ | |
310 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
311 | union sctp_addr_param *param) | |
312 | { | |
313 | int length = sizeof(sctp_ipv4addr_param_t); | |
314 | ||
315 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 316 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 317 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
318 | |
319 | return length; | |
320 | } | |
321 | ||
322 | /* Initialize a sctp_addr from a dst_entry. */ | |
18a353f4 | 323 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, |
854d43a4 | 324 | __be16 port) |
1da177e4 | 325 | { |
1da177e4 LT |
326 | saddr->v4.sin_family = AF_INET; |
327 | saddr->v4.sin_port = port; | |
18a353f4 | 328 | saddr->v4.sin_addr.s_addr = fl4->saddr; |
1da177e4 LT |
329 | } |
330 | ||
331 | /* Compare two addresses exactly. */ | |
332 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
333 | const union sctp_addr *addr2) | |
334 | { | |
335 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
336 | return 0; | |
337 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
338 | return 0; | |
339 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
340 | return 0; | |
341 | ||
342 | return 1; | |
343 | } | |
344 | ||
345 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 346 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
347 | { |
348 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 349 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
350 | addr->v4.sin_port = port; |
351 | } | |
352 | ||
353 | /* Is this a wildcard address? */ | |
354 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
355 | { | |
e6f1cebf | 356 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
357 | } |
358 | ||
359 | /* This function checks if the address is a valid address to be used for | |
360 | * SCTP binding. | |
361 | * | |
362 | * Output: | |
363 | * Return 0 - If the address is a non-unicast or an illegal address. | |
364 | * Return 1 - If the address is a unicast. | |
365 | */ | |
5636bef7 VY |
366 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
367 | struct sctp_sock *sp, | |
368 | const struct sk_buff *skb) | |
1da177e4 | 369 | { |
7dab83de VY |
370 | /* IPv4 addresses not allowed */ |
371 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
372 | return 0; | |
373 | ||
1da177e4 | 374 | /* Is this a non-unicast address or a unusable SCTP address? */ |
b5cb2bbc | 375 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
376 | return 0; |
377 | ||
d808ad9a | 378 | /* Is this a broadcast address? */ |
511c3f92 | 379 | if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) |
d808ad9a | 380 | return 0; |
5636bef7 | 381 | |
1da177e4 LT |
382 | return 1; |
383 | } | |
384 | ||
385 | /* Should this be available for binding? */ | |
386 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
387 | { | |
6b175b26 | 388 | int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); |
1da177e4 | 389 | |
1da177e4 | 390 | |
e6f1cebf | 391 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
392 | ret != RTN_LOCAL && |
393 | !sp->inet.freebind && | |
394 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 395 | return 0; |
cdac4e07 | 396 | |
7dab83de VY |
397 | if (ipv6_only_sock(sctp_opt2sk(sp))) |
398 | return 0; | |
399 | ||
1da177e4 LT |
400 | return 1; |
401 | } | |
402 | ||
403 | /* Checking the loopback, private and other address scopes as defined in | |
404 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
405 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
406 | * | |
407 | * Level 0 - unusable SCTP addresses | |
408 | * Level 1 - loopback address | |
409 | * Level 2 - link-local addresses | |
410 | * Level 3 - private addresses. | |
411 | * Level 4 - global addresses | |
412 | * For INIT and INIT-ACK address list, let L be the level of | |
413 | * of requested destination address, sender and receiver | |
414 | * SHOULD include all of its addresses with level greater | |
415 | * than or equal to L. | |
72388433 BD |
416 | * |
417 | * IPv4 scoping can be controlled through sysctl option | |
418 | * net.sctp.addr_scope_policy | |
1da177e4 LT |
419 | */ |
420 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
421 | { | |
422 | sctp_scope_t retval; | |
423 | ||
1da177e4 | 424 | /* Check for unusable SCTP addresses. */ |
b5cb2bbc | 425 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 426 | retval = SCTP_SCOPE_UNUSABLE; |
b5cb2bbc | 427 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 428 | retval = SCTP_SCOPE_LOOPBACK; |
b5cb2bbc | 429 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 430 | retval = SCTP_SCOPE_LINK; |
b5cb2bbc JP |
431 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
432 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || | |
433 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { | |
1da177e4 LT |
434 | retval = SCTP_SCOPE_PRIVATE; |
435 | } else { | |
436 | retval = SCTP_SCOPE_GLOBAL; | |
437 | } | |
438 | ||
439 | return retval; | |
440 | } | |
441 | ||
442 | /* Returns a valid dst cache entry for the given source and destination ip | |
443 | * addresses. If an association is passed, trys to get a dst entry with a | |
444 | * source address that matches an address in the bind address list. | |
445 | */ | |
da0420be VY |
446 | static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
447 | struct flowi *fl, struct sock *sk) | |
1da177e4 | 448 | { |
da0420be | 449 | struct sctp_association *asoc = t->asoc; |
1da177e4 | 450 | struct rtable *rt; |
9914ae3c | 451 | struct flowi4 *fl4 = &fl->u.ip4; |
1da177e4 | 452 | struct sctp_bind_addr *bp; |
1da177e4 | 453 | struct sctp_sockaddr_entry *laddr; |
1da177e4 | 454 | struct dst_entry *dst = NULL; |
da0420be | 455 | union sctp_addr *daddr = &t->ipaddr; |
1da177e4 LT |
456 | union sctp_addr dst_saddr; |
457 | ||
9914ae3c VY |
458 | memset(fl4, 0x0, sizeof(struct flowi4)); |
459 | fl4->daddr = daddr->v4.sin_addr.s_addr; | |
460 | fl4->fl4_dport = daddr->v4.sin_port; | |
461 | fl4->flowi4_proto = IPPROTO_SCTP; | |
1da177e4 | 462 | if (asoc) { |
9914ae3c VY |
463 | fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); |
464 | fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; | |
465 | fl4->fl4_sport = htons(asoc->base.bind_addr.port); | |
1da177e4 | 466 | } |
6429d3dc | 467 | if (saddr) { |
9914ae3c VY |
468 | fl4->saddr = saddr->v4.sin_addr.s_addr; |
469 | fl4->fl4_sport = saddr->v4.sin_port; | |
6429d3dc | 470 | } |
1da177e4 | 471 | |
21454aaa | 472 | SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", |
9914ae3c | 473 | __func__, &fl4->daddr, &fl4->saddr); |
1da177e4 | 474 | |
9914ae3c | 475 | rt = ip_route_output_key(&init_net, fl4); |
b23dd4fe | 476 | if (!IS_ERR(rt)) |
d8d1f30b | 477 | dst = &rt->dst; |
1da177e4 LT |
478 | |
479 | /* If there is no association or if a source address is passed, no | |
480 | * more validation is required. | |
481 | */ | |
482 | if (!asoc || saddr) | |
483 | goto out; | |
484 | ||
485 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
486 | |
487 | if (dst) { | |
488 | /* Walk through the bind address list and look for a bind | |
489 | * address that matches the source address of the returned dst. | |
490 | */ | |
18a353f4 | 491 | sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); |
559cf710 VY |
492 | rcu_read_lock(); |
493 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
8a07eb0a MH |
494 | if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || |
495 | (laddr->state != SCTP_ADDR_SRC && | |
496 | !asoc->src_out_of_asoc_ok)) | |
dc022a98 | 497 | continue; |
854d43a4 | 498 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
499 | goto out_unlock; |
500 | } | |
559cf710 | 501 | rcu_read_unlock(); |
1da177e4 LT |
502 | |
503 | /* None of the bound addresses match the source address of the | |
504 | * dst. So release it. | |
505 | */ | |
506 | dst_release(dst); | |
507 | dst = NULL; | |
508 | } | |
509 | ||
510 | /* Walk through the bind address list and try to get a dst that | |
511 | * matches a bind address as the source address. | |
512 | */ | |
559cf710 VY |
513 | rcu_read_lock(); |
514 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
515 | if (!laddr->valid) | |
516 | continue; | |
f57d96b2 | 517 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e | 518 | (AF_INET == laddr->a.sa.sa_family)) { |
9914ae3c VY |
519 | fl4->saddr = laddr->a.v4.sin_addr.s_addr; |
520 | fl4->fl4_sport = laddr->a.v4.sin_port; | |
521 | rt = ip_route_output_key(&init_net, fl4); | |
b23dd4fe | 522 | if (!IS_ERR(rt)) { |
d8d1f30b | 523 | dst = &rt->dst; |
1da177e4 LT |
524 | goto out_unlock; |
525 | } | |
526 | } | |
527 | } | |
528 | ||
529 | out_unlock: | |
559cf710 | 530 | rcu_read_unlock(); |
1da177e4 | 531 | out: |
da0420be | 532 | t->dst = dst; |
1da177e4 | 533 | if (dst) |
21454aaa | 534 | SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", |
18a353f4 | 535 | &fl4->daddr, &fl4->saddr); |
1da177e4 LT |
536 | else |
537 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
1da177e4 LT |
538 | } |
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 | */ | |
e5117101 | 543 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
9914ae3c | 544 | struct sctp_transport *t, |
9914ae3c | 545 | struct flowi *fl) |
1da177e4 | 546 | { |
9914ae3c VY |
547 | union sctp_addr *saddr = &t->saddr; |
548 | struct rtable *rt = (struct rtable *)t->dst; | |
23ec47a0 | 549 | |
1da177e4 LT |
550 | if (rt) { |
551 | saddr->v4.sin_family = AF_INET; | |
902ebd3e | 552 | saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; |
1da177e4 LT |
553 | } |
554 | } | |
555 | ||
556 | /* What interface did this skb arrive on? */ | |
557 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
558 | { | |
92101b3b | 559 | return inet_iif(skb); |
1da177e4 LT |
560 | } |
561 | ||
562 | /* Was this packet marked by Explicit Congestion Notification? */ | |
563 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
564 | { | |
eddc9ec5 | 565 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
566 | } |
567 | ||
568 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
569 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
570 | struct sctp_association *asoc) | |
571 | { | |
3b1e0a65 | 572 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 573 | sk->sk_prot); |
914e1c8b | 574 | struct inet_sock *newinet; |
1da177e4 LT |
575 | |
576 | if (!newsk) | |
577 | goto out; | |
578 | ||
579 | sock_init_data(NULL, newsk); | |
580 | ||
914e1c8b | 581 | sctp_copy_sock(newsk, sk, asoc); |
1da177e4 LT |
582 | sock_reset_flag(newsk, SOCK_ZAPPED); |
583 | ||
584 | newinet = inet_sk(newsk); | |
585 | ||
c720c7e8 | 586 | newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
1da177e4 | 587 | |
e6848976 | 588 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
589 | |
590 | if (newsk->sk_prot->init(newsk)) { | |
591 | sk_common_release(newsk); | |
592 | newsk = NULL; | |
593 | } | |
594 | ||
595 | out: | |
596 | return newsk; | |
597 | } | |
598 | ||
599 | /* Map address, empty for v4 family */ | |
600 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
601 | { | |
602 | /* Empty */ | |
603 | } | |
604 | ||
605 | /* Dump the v4 addr to the seq file. */ | |
606 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
607 | { | |
21454aaa | 608 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
1da177e4 LT |
609 | } |
610 | ||
b9031d9d VY |
611 | static void sctp_v4_ecn_capable(struct sock *sk) |
612 | { | |
613 | INET_ECN_xmit(sk); | |
614 | } | |
615 | ||
9f7d653b MH |
616 | void sctp_addr_wq_timeout_handler(unsigned long arg) |
617 | { | |
4db67e80 | 618 | struct net *net = (struct net *)arg; |
9f7d653b MH |
619 | struct sctp_sockaddr_entry *addrw, *temp; |
620 | struct sctp_sock *sp; | |
621 | ||
4db67e80 | 622 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 623 | |
4db67e80 | 624 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
9f7d653b | 625 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ", |
4db67e80 | 626 | " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state, |
9f7d653b MH |
627 | addrw); |
628 | ||
dfd56b8b | 629 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b MH |
630 | /* 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; | |
4db67e80 | 640 | if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && |
9f7d653b MH |
641 | addrw->state == SCTP_ADDR_NEW) { |
642 | unsigned long timeo_val; | |
643 | ||
644 | SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n", | |
645 | SCTP_ADDRESS_TICK_DELAY); | |
646 | timeo_val = jiffies; | |
647 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 648 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b MH |
649 | break; |
650 | } | |
651 | } | |
5d0c90cf | 652 | #endif |
4db67e80 | 653 | list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { |
9f7d653b MH |
654 | struct sock *sk; |
655 | ||
656 | sk = sctp_opt2sk(sp); | |
657 | /* ignore bound-specific endpoints */ | |
658 | if (!sctp_is_ep_boundall(sk)) | |
659 | continue; | |
660 | sctp_bh_lock_sock(sk); | |
661 | if (sctp_asconf_mgmt(sp, addrw) < 0) | |
662 | SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n"); | |
663 | sctp_bh_unlock_sock(sk); | |
664 | } | |
39d84a58 | 665 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b | 666 | free_next: |
39d84a58 | 667 | #endif |
9f7d653b MH |
668 | list_del(&addrw->list); |
669 | kfree(addrw); | |
670 | } | |
4db67e80 | 671 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
672 | } |
673 | ||
4db67e80 | 674 | static void sctp_free_addr_wq(struct net *net) |
9f7d653b MH |
675 | { |
676 | struct sctp_sockaddr_entry *addrw; | |
677 | struct sctp_sockaddr_entry *temp; | |
678 | ||
4db67e80 EB |
679 | spin_lock_bh(&net->sctp.addr_wq_lock); |
680 | del_timer(&net->sctp.addr_wq_timer); | |
681 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { | |
9f7d653b MH |
682 | list_del(&addrw->list); |
683 | kfree(addrw); | |
684 | } | |
4db67e80 | 685 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
686 | } |
687 | ||
688 | /* lookup the entry for the same address in the addr_waitq | |
689 | * sctp_addr_wq MUST be locked | |
690 | */ | |
4db67e80 EB |
691 | static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, |
692 | struct sctp_sockaddr_entry *addr) | |
9f7d653b MH |
693 | { |
694 | struct sctp_sockaddr_entry *addrw; | |
695 | ||
4db67e80 | 696 | list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { |
9f7d653b MH |
697 | if (addrw->a.sa.sa_family != addr->a.sa.sa_family) |
698 | continue; | |
699 | if (addrw->a.sa.sa_family == AF_INET) { | |
700 | if (addrw->a.v4.sin_addr.s_addr == | |
701 | addr->a.v4.sin_addr.s_addr) | |
702 | return addrw; | |
703 | } else if (addrw->a.sa.sa_family == AF_INET6) { | |
704 | if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, | |
705 | &addr->a.v6.sin6_addr)) | |
706 | return addrw; | |
707 | } | |
708 | } | |
709 | return NULL; | |
710 | } | |
711 | ||
4db67e80 | 712 | void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) |
9f7d653b MH |
713 | { |
714 | struct sctp_sockaddr_entry *addrw; | |
715 | unsigned long timeo_val; | |
716 | ||
717 | /* first, we check if an opposite message already exist in the queue. | |
718 | * If we found such message, it is removed. | |
719 | * This operation is a bit stupid, but the DHCP client attaches the | |
720 | * new address after a couple of addition and deletion of that address | |
721 | */ | |
722 | ||
4db67e80 | 723 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 724 | /* Offsets existing events in addr_wq */ |
4db67e80 | 725 | addrw = sctp_addr_wq_lookup(net, addr); |
9f7d653b MH |
726 | if (addrw) { |
727 | if (addrw->state != cmd) { | |
728 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ", | |
729 | " in wq %p\n", addrw->state, &addrw->a, | |
4db67e80 | 730 | &net->sctp.addr_waitq); |
9f7d653b MH |
731 | list_del(&addrw->list); |
732 | kfree(addrw); | |
733 | } | |
4db67e80 | 734 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
735 | return; |
736 | } | |
737 | ||
738 | /* OK, we have to add the new address to the wait queue */ | |
739 | addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
740 | if (addrw == NULL) { | |
4db67e80 | 741 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
742 | return; |
743 | } | |
744 | addrw->state = cmd; | |
4db67e80 | 745 | list_add_tail(&addrw->list, &net->sctp.addr_waitq); |
9f7d653b | 746 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ", |
4db67e80 | 747 | " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq); |
9f7d653b | 748 | |
4db67e80 | 749 | if (!timer_pending(&net->sctp.addr_wq_timer)) { |
9f7d653b MH |
750 | timeo_val = jiffies; |
751 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 752 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b | 753 | } |
4db67e80 | 754 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
755 | } |
756 | ||
29303547 VY |
757 | /* Event handler for inet address addition/deletion events. |
758 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
759 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
760 | * time and thus corrupt the list. | |
761 | * The reader side is protected with RCU. | |
762 | */ | |
24123186 AB |
763 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
764 | void *ptr) | |
1da177e4 | 765 | { |
29c7cf96 | 766 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
767 | struct sctp_sockaddr_entry *addr = NULL; |
768 | struct sctp_sockaddr_entry *temp; | |
4db67e80 | 769 | struct net *net = dev_net(ifa->ifa_dev->dev); |
22626216 | 770 | int found = 0; |
1da177e4 | 771 | |
29c7cf96 SS |
772 | switch (ev) { |
773 | case NETDEV_UP: | |
774 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
775 | if (addr) { | |
776 | addr->a.v4.sin_family = AF_INET; | |
777 | addr->a.v4.sin_port = 0; | |
778 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 | 779 | addr->valid = 1; |
4db67e80 EB |
780 | spin_lock_bh(&net->sctp.local_addr_lock); |
781 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); | |
782 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); | |
783 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
29c7cf96 SS |
784 | } |
785 | break; | |
786 | case NETDEV_DOWN: | |
4db67e80 | 787 | spin_lock_bh(&net->sctp.local_addr_lock); |
29303547 | 788 | list_for_each_entry_safe(addr, temp, |
4db67e80 | 789 | &net->sctp.local_addr_list, list) { |
a40a7d15 PE |
790 | if (addr->a.sa.sa_family == AF_INET && |
791 | addr->a.v4.sin_addr.s_addr == | |
792 | ifa->ifa_local) { | |
4db67e80 | 793 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
22626216 | 794 | found = 1; |
29303547 VY |
795 | addr->valid = 0; |
796 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
797 | break; |
798 | } | |
799 | } | |
4db67e80 | 800 | spin_unlock_bh(&net->sctp.local_addr_lock); |
22626216 | 801 | if (found) |
1231f0ba | 802 | kfree_rcu(addr, rcu); |
29c7cf96 SS |
803 | break; |
804 | } | |
1da177e4 LT |
805 | |
806 | return NOTIFY_DONE; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Initialize the control inode/socket with a control endpoint data | |
811 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
812 | */ | |
2ce95503 | 813 | static int sctp_ctl_sock_init(struct net *net) |
1da177e4 LT |
814 | { |
815 | int err; | |
fb13d9f9 | 816 | sa_family_t family = PF_INET; |
1da177e4 LT |
817 | |
818 | if (sctp_get_pf_specific(PF_INET6)) | |
819 | family = PF_INET6; | |
1da177e4 | 820 | |
2ce95503 EB |
821 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, |
822 | SOCK_SEQPACKET, IPPROTO_SCTP, net); | |
fb13d9f9 BH |
823 | |
824 | /* If IPv6 socket could not be created, try the IPv4 socket */ | |
825 | if (err < 0 && family == PF_INET6) | |
2ce95503 | 826 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, |
fb13d9f9 | 827 | SOCK_SEQPACKET, IPPROTO_SCTP, |
2ce95503 | 828 | net); |
fb13d9f9 | 829 | |
1da177e4 | 830 | if (err < 0) { |
145ce502 | 831 | pr_err("Failed to create the SCTP control socket\n"); |
1da177e4 LT |
832 | return err; |
833 | } | |
1da177e4 LT |
834 | return 0; |
835 | } | |
836 | ||
837 | /* Register address family specific functions. */ | |
838 | int sctp_register_af(struct sctp_af *af) | |
839 | { | |
840 | switch (af->sa_family) { | |
841 | case AF_INET: | |
842 | if (sctp_af_v4_specific) | |
843 | return 0; | |
844 | sctp_af_v4_specific = af; | |
845 | break; | |
846 | case AF_INET6: | |
847 | if (sctp_af_v6_specific) | |
848 | return 0; | |
849 | sctp_af_v6_specific = af; | |
850 | break; | |
851 | default: | |
852 | return 0; | |
853 | } | |
854 | ||
855 | INIT_LIST_HEAD(&af->list); | |
856 | list_add_tail(&af->list, &sctp_address_families); | |
857 | return 1; | |
858 | } | |
859 | ||
860 | /* Get the table of functions for manipulating a particular address | |
861 | * family. | |
862 | */ | |
863 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
864 | { | |
865 | switch (family) { | |
866 | case AF_INET: | |
867 | return sctp_af_v4_specific; | |
868 | case AF_INET6: | |
869 | return sctp_af_v6_specific; | |
870 | default: | |
871 | return NULL; | |
872 | } | |
873 | } | |
874 | ||
875 | /* Common code to initialize a AF_INET msg_name. */ | |
876 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
877 | { | |
878 | struct sockaddr_in *sin; | |
879 | ||
880 | sin = (struct sockaddr_in *)msgname; | |
881 | *addr_len = sizeof(struct sockaddr_in); | |
882 | sin->sin_family = AF_INET; | |
883 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
884 | } | |
885 | ||
886 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
887 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
888 | int *addr_len) | |
889 | { | |
890 | struct sockaddr_in *sin, *sinfrom; | |
891 | ||
892 | if (msgname) { | |
893 | struct sctp_association *asoc; | |
894 | ||
895 | asoc = event->asoc; | |
896 | sctp_inet_msgname(msgname, addr_len); | |
897 | sin = (struct sockaddr_in *)msgname; | |
898 | sinfrom = &asoc->peer.primary_addr.v4; | |
899 | sin->sin_port = htons(asoc->peer.port); | |
900 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
901 | } | |
902 | } | |
903 | ||
904 | /* Initialize and copy out a msgname from an inbound skb. */ | |
905 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
906 | { | |
1da177e4 | 907 | if (msgname) { |
2c0fd387 ACM |
908 | struct sctphdr *sh = sctp_hdr(skb); |
909 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
910 | ||
1da177e4 | 911 | sctp_inet_msgname(msgname, len); |
1da177e4 | 912 | sin->sin_port = sh->source; |
eddc9ec5 | 913 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
914 | } |
915 | } | |
916 | ||
917 | /* Do we support this AF? */ | |
918 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
919 | { | |
920 | /* PF_INET only supports AF_INET addresses. */ | |
a02cec21 | 921 | return AF_INET == family; |
1da177e4 LT |
922 | } |
923 | ||
924 | /* Address matching with wildcards allowed. */ | |
925 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
926 | const union sctp_addr *addr2, | |
927 | struct sctp_sock *opt) | |
928 | { | |
929 | /* PF_INET only supports AF_INET addresses. */ | |
930 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
931 | return 0; | |
e6f1cebf AV |
932 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
933 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
934 | return 1; |
935 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
936 | return 1; | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
941 | /* Verify that provided sockaddr looks bindable. Common verification has | |
942 | * already been taken care of. | |
943 | */ | |
944 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
945 | { | |
946 | return sctp_v4_available(addr, opt); | |
947 | } | |
948 | ||
949 | /* Verify that sockaddr looks sendable. Common verification has already | |
950 | * been taken care of. | |
951 | */ | |
952 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
953 | { | |
954 | return 1; | |
955 | } | |
956 | ||
957 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
958 | * chunks. Returns number of addresses supported. | |
959 | */ | |
960 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 961 | __be16 *types) |
1da177e4 LT |
962 | { |
963 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
964 | return 1; | |
965 | } | |
966 | ||
967 | /* Wrapper routine that calls the ip transmit routine. */ | |
968 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
f880374c | 969 | struct sctp_transport *transport) |
1da177e4 | 970 | { |
f880374c HX |
971 | struct inet_sock *inet = inet_sk(skb->sk); |
972 | ||
21454aaa | 973 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", |
0dc47877 | 974 | __func__, skb, skb->len, |
7ef73bca DM |
975 | &transport->fl.u.ip4.saddr, |
976 | &transport->fl.u.ip4.daddr); | |
1da177e4 | 977 | |
f880374c HX |
978 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
979 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; | |
980 | ||
1da177e4 | 981 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); |
d9d8da80 | 982 | return ip_queue_xmit(skb, &transport->fl); |
1da177e4 LT |
983 | } |
984 | ||
15efbe76 | 985 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
986 | |
987 | static struct sctp_pf sctp_pf_inet = { | |
988 | .event_msgname = sctp_inet_event_msgname, | |
989 | .skb_msgname = sctp_inet_skb_msgname, | |
990 | .af_supported = sctp_inet_af_supported, | |
991 | .cmp_addr = sctp_inet_cmp_addr, | |
992 | .bind_verify = sctp_inet_bind_verify, | |
993 | .send_verify = sctp_inet_send_verify, | |
994 | .supported_addrs = sctp_inet_supported_addrs, | |
995 | .create_accept_sk = sctp_v4_create_accept_sk, | |
996 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 997 | .af = &sctp_af_inet |
1da177e4 LT |
998 | }; |
999 | ||
1000 | /* Notifier for inetaddr addition/deletion events. */ | |
1001 | static struct notifier_block sctp_inetaddr_notifier = { | |
1002 | .notifier_call = sctp_inetaddr_event, | |
1003 | }; | |
1004 | ||
1005 | /* Socket operations. */ | |
90ddc4f0 | 1006 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
1007 | .family = PF_INET, |
1008 | .owner = THIS_MODULE, | |
1009 | .release = inet_release, /* Needs to be wrapped... */ | |
1010 | .bind = inet_bind, | |
1011 | .connect = inet_dgram_connect, | |
1012 | .socketpair = sock_no_socketpair, | |
1013 | .accept = inet_accept, | |
1014 | .getname = inet_getname, /* Semantics are different. */ | |
1015 | .poll = sctp_poll, | |
1016 | .ioctl = inet_ioctl, | |
1017 | .listen = sctp_inet_listen, | |
1018 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
1019 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
1020 | .getsockopt = sock_common_getsockopt, | |
1021 | .sendmsg = inet_sendmsg, | |
1022 | .recvmsg = sock_common_recvmsg, | |
1023 | .mmap = sock_no_mmap, | |
1024 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1025 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1026 | .compat_setsockopt = compat_sock_common_setsockopt, |
1027 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1028 | #endif |
1da177e4 LT |
1029 | }; |
1030 | ||
1031 | /* Registration with AF_INET family. */ | |
1032 | static struct inet_protosw sctp_seqpacket_protosw = { | |
1033 | .type = SOCK_SEQPACKET, | |
1034 | .protocol = IPPROTO_SCTP, | |
1035 | .prot = &sctp_prot, | |
1036 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1037 | .no_check = 0, |
1038 | .flags = SCTP_PROTOSW_FLAG | |
1039 | }; | |
1040 | static struct inet_protosw sctp_stream_protosw = { | |
1041 | .type = SOCK_STREAM, | |
1042 | .protocol = IPPROTO_SCTP, | |
1043 | .prot = &sctp_prot, | |
1044 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1045 | .no_check = 0, |
1046 | .flags = SCTP_PROTOSW_FLAG | |
1047 | }; | |
1048 | ||
1049 | /* Register with IP layer. */ | |
32613090 | 1050 | static const struct net_protocol sctp_protocol = { |
1da177e4 LT |
1051 | .handler = sctp_rcv, |
1052 | .err_handler = sctp_v4_err, | |
1053 | .no_policy = 1, | |
1054 | }; | |
1055 | ||
1056 | /* IPv4 address related functions. */ | |
15efbe76 | 1057 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
1058 | .sa_family = AF_INET, |
1059 | .sctp_xmit = sctp_v4_xmit, | |
1060 | .setsockopt = ip_setsockopt, | |
1061 | .getsockopt = ip_getsockopt, | |
1062 | .get_dst = sctp_v4_get_dst, | |
1063 | .get_saddr = sctp_v4_get_saddr, | |
1064 | .copy_addrlist = sctp_v4_copy_addrlist, | |
1065 | .from_skb = sctp_v4_from_skb, | |
1066 | .from_sk = sctp_v4_from_sk, | |
1067 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
1068 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
1069 | .from_addr_param = sctp_v4_from_addr_param, | |
1070 | .to_addr_param = sctp_v4_to_addr_param, | |
543d9cfe ACM |
1071 | .cmp_addr = sctp_v4_cmp_addr, |
1072 | .addr_valid = sctp_v4_addr_valid, | |
1073 | .inaddr_any = sctp_v4_inaddr_any, | |
1074 | .is_any = sctp_v4_is_any, | |
1075 | .available = sctp_v4_available, | |
1076 | .scope = sctp_v4_scope, | |
1077 | .skb_iif = sctp_v4_skb_iif, | |
1078 | .is_ce = sctp_v4_is_ce, | |
1079 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 1080 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
1081 | .net_header_len = sizeof(struct iphdr), |
1082 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 1083 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1084 | .compat_setsockopt = compat_ip_setsockopt, |
1085 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1086 | #endif |
1da177e4 LT |
1087 | }; |
1088 | ||
1089 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { | |
1090 | ||
1091 | switch (family) { | |
1092 | case PF_INET: | |
1093 | return sctp_pf_inet_specific; | |
1094 | case PF_INET6: | |
1095 | return sctp_pf_inet6_specific; | |
1096 | default: | |
1097 | return NULL; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | /* Register the PF specific function table. */ | |
1102 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
1103 | { | |
1104 | switch (family) { | |
1105 | case PF_INET: | |
1106 | if (sctp_pf_inet_specific) | |
1107 | return 0; | |
1108 | sctp_pf_inet_specific = pf; | |
1109 | break; | |
1110 | case PF_INET6: | |
1111 | if (sctp_pf_inet6_specific) | |
1112 | return 0; | |
1113 | sctp_pf_inet6_specific = pf; | |
1114 | break; | |
1115 | default: | |
1116 | return 0; | |
1117 | } | |
1118 | return 1; | |
1119 | } | |
1120 | ||
996b1dba YH |
1121 | static inline int init_sctp_mibs(void) |
1122 | { | |
7d720c3e | 1123 | return snmp_mib_init((void __percpu **)sctp_statistics, |
1823e4c8 ED |
1124 | sizeof(struct sctp_mib), |
1125 | __alignof__(struct sctp_mib)); | |
1da177e4 LT |
1126 | } |
1127 | ||
996b1dba | 1128 | static inline void cleanup_sctp_mibs(void) |
1da177e4 | 1129 | { |
7d720c3e | 1130 | snmp_mib_free((void __percpu **)sctp_statistics); |
1da177e4 LT |
1131 | } |
1132 | ||
270637ab VY |
1133 | static void sctp_v4_pf_init(void) |
1134 | { | |
1135 | /* Initialize the SCTP specific PF functions. */ | |
1136 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1137 | sctp_register_af(&sctp_af_inet); | |
1138 | } | |
1139 | ||
1140 | static void sctp_v4_pf_exit(void) | |
1141 | { | |
1142 | list_del(&sctp_af_inet.list); | |
1143 | } | |
1144 | ||
1145 | static int sctp_v4_protosw_init(void) | |
1146 | { | |
1147 | int rc; | |
1148 | ||
1149 | rc = proto_register(&sctp_prot, 1); | |
1150 | if (rc) | |
1151 | return rc; | |
1152 | ||
1153 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1154 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1155 | inet_register_protosw(&sctp_stream_protosw); | |
1156 | ||
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | static void sctp_v4_protosw_exit(void) | |
1161 | { | |
1162 | inet_unregister_protosw(&sctp_stream_protosw); | |
1163 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1164 | proto_unregister(&sctp_prot); | |
1165 | } | |
1166 | ||
1167 | static int sctp_v4_add_protocol(void) | |
1168 | { | |
1169 | /* Register notifier for inet address additions/deletions. */ | |
1170 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1171 | ||
1172 | /* Register SCTP with inet layer. */ | |
1173 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1174 | return -EAGAIN; | |
1175 | ||
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static void sctp_v4_del_protocol(void) | |
1180 | { | |
1181 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1182 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1183 | } | |
1184 | ||
4db67e80 EB |
1185 | static int sctp_net_init(struct net *net) |
1186 | { | |
2ce95503 EB |
1187 | int status; |
1188 | ||
1189 | /* Initialize the control inode/socket for handling OOTB packets. */ | |
1190 | if ((status = sctp_ctl_sock_init(net))) { | |
1191 | pr_err("Failed to initialize the SCTP control sock\n"); | |
1192 | goto err_ctl_sock_init; | |
1193 | } | |
1194 | ||
4db67e80 EB |
1195 | /* Initialize the local address list. */ |
1196 | INIT_LIST_HEAD(&net->sctp.local_addr_list); | |
1197 | spin_lock_init(&net->sctp.local_addr_lock); | |
1198 | sctp_get_local_addr_list(net); | |
1199 | ||
1200 | /* Initialize the address event list */ | |
1201 | INIT_LIST_HEAD(&net->sctp.addr_waitq); | |
1202 | INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); | |
1203 | spin_lock_init(&net->sctp.addr_wq_lock); | |
1204 | net->sctp.addr_wq_timer.expires = 0; | |
1205 | setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, | |
1206 | (unsigned long)net); | |
1207 | ||
1208 | return 0; | |
2ce95503 EB |
1209 | |
1210 | err_ctl_sock_init: | |
1211 | return status; | |
4db67e80 EB |
1212 | } |
1213 | ||
1214 | static void sctp_net_exit(struct net *net) | |
1215 | { | |
1216 | /* Free the local address list */ | |
1217 | sctp_free_addr_wq(net); | |
1218 | sctp_free_local_addr_list(net); | |
2ce95503 EB |
1219 | |
1220 | /* Free the control endpoint. */ | |
1221 | inet_ctl_sock_destroy(net->sctp.ctl_sock); | |
4db67e80 EB |
1222 | } |
1223 | ||
1224 | static struct pernet_operations sctp_net_ops = { | |
1225 | .init = sctp_net_init, | |
1226 | .exit = sctp_net_exit, | |
1227 | }; | |
1228 | ||
1da177e4 LT |
1229 | /* Initialize the universe into something sensible. */ |
1230 | SCTP_STATIC __init int sctp_init(void) | |
1231 | { | |
1232 | int i; | |
1233 | int status = -EINVAL; | |
1234 | unsigned long goal; | |
4d93df0a NH |
1235 | unsigned long limit; |
1236 | int max_share; | |
1da177e4 LT |
1237 | int order; |
1238 | ||
1239 | /* SCTP_DEBUG sanity check. */ | |
1240 | if (!sctp_sanity_check()) | |
1241 | goto out; | |
1242 | ||
827bf122 | 1243 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1244 | status = -ENOBUFS; |
1245 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1246 | sizeof(struct sctp_bind_bucket), | |
1247 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1248 | NULL); |
1da177e4 | 1249 | if (!sctp_bucket_cachep) |
827bf122 | 1250 | goto out; |
1da177e4 LT |
1251 | |
1252 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1253 | sizeof(struct sctp_chunk), | |
1254 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1255 | NULL); |
1da177e4 LT |
1256 | if (!sctp_chunk_cachep) |
1257 | goto err_chunk_cachep; | |
1258 | ||
1259 | /* Allocate and initialise sctp mibs. */ | |
1260 | status = init_sctp_mibs(); | |
1261 | if (status) | |
1262 | goto err_init_mibs; | |
1263 | ||
1264 | /* Initialize proc fs directory. */ | |
1265 | status = sctp_proc_init(); | |
1266 | if (status) | |
1267 | goto err_init_proc; | |
1268 | ||
1269 | /* Initialize object count debugging. */ | |
1270 | sctp_dbg_objcnt_init(); | |
1271 | ||
1da177e4 LT |
1272 | /* |
1273 | * 14. Suggested SCTP Protocol Parameter Values | |
1274 | */ | |
1275 | /* The following protocol parameters are RECOMMENDED: */ | |
1276 | /* RTO.Initial - 3 seconds */ | |
1277 | sctp_rto_initial = SCTP_RTO_INITIAL; | |
1278 | /* RTO.Min - 1 second */ | |
1279 | sctp_rto_min = SCTP_RTO_MIN; | |
1280 | /* RTO.Max - 60 seconds */ | |
1281 | sctp_rto_max = SCTP_RTO_MAX; | |
1282 | /* RTO.Alpha - 1/8 */ | |
1283 | sctp_rto_alpha = SCTP_RTO_ALPHA; | |
1284 | /* RTO.Beta - 1/4 */ | |
1285 | sctp_rto_beta = SCTP_RTO_BETA; | |
1286 | ||
1287 | /* Valid.Cookie.Life - 60 seconds */ | |
3fd091e7 | 1288 | sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
1da177e4 LT |
1289 | |
1290 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1291 | sctp_cookie_preserve_enable = 1; | |
1292 | ||
1293 | /* Max.Burst - 4 */ | |
70331571 | 1294 | sctp_max_burst = SCTP_DEFAULT_MAX_BURST; |
1da177e4 LT |
1295 | |
1296 | /* Association.Max.Retrans - 10 attempts | |
1297 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1298 | * Max.Init.Retransmits - 8 attempts | |
1299 | */ | |
1300 | sctp_max_retrans_association = 10; | |
1301 | sctp_max_retrans_path = 5; | |
1302 | sctp_max_retrans_init = 8; | |
1303 | ||
4eb701df NH |
1304 | /* Sendbuffer growth - do per-socket accounting */ |
1305 | sctp_sndbuf_policy = 0; | |
1306 | ||
049b3ff5 NH |
1307 | /* Rcvbuffer growth - do per-socket accounting */ |
1308 | sctp_rcvbuf_policy = 0; | |
1309 | ||
1da177e4 | 1310 | /* HB.interval - 30 seconds */ |
2f85a429 VY |
1311 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
1312 | ||
1313 | /* delayed SACK timeout */ | |
1314 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1da177e4 LT |
1315 | |
1316 | /* Implementation specific variables. */ | |
1317 | ||
1318 | /* Initialize default stream count setup information. */ | |
1319 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1320 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1321 | ||
2692ba61 XW |
1322 | /* Initialize maximum autoclose timeout. */ |
1323 | sctp_max_autoclose = INT_MAX / HZ; | |
1324 | ||
1da177e4 LT |
1325 | /* Initialize handle used for association ids. */ |
1326 | idr_init(&sctp_assocs_id); | |
1327 | ||
f03d78db | 1328 | limit = nr_free_buffer_pages() / 8; |
4d93df0a NH |
1329 | limit = max(limit, 128UL); |
1330 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1331 | sysctl_sctp_mem[1] = limit; | |
1332 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1333 | ||
1334 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1335 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1336 | max_share = min(4UL*1024*1024, limit); | |
1337 | ||
845525a6 | 1338 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
87fb4b7b | 1339 | sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); |
4d93df0a NH |
1340 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); |
1341 | ||
3ab224be | 1342 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1343 | sysctl_sctp_wmem[1] = 16*1024; |
1344 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1345 | ||
1da177e4 LT |
1346 | /* Size and allocate the association hash table. |
1347 | * The methodology is similar to that of the tcp hash tables. | |
1348 | */ | |
4481374c JB |
1349 | if (totalram_pages >= (128 * 1024)) |
1350 | goal = totalram_pages >> (22 - PAGE_SHIFT); | |
1da177e4 | 1351 | else |
4481374c | 1352 | goal = totalram_pages >> (24 - PAGE_SHIFT); |
1da177e4 LT |
1353 | |
1354 | for (order = 0; (1UL << order) < goal; order++) | |
1355 | ; | |
1356 | ||
1357 | do { | |
1358 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1359 | sizeof(struct sctp_hashbucket); | |
1360 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1361 | continue; | |
1362 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
a84b50ce | 1363 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1364 | } while (!sctp_assoc_hashtable && --order > 0); |
1365 | if (!sctp_assoc_hashtable) { | |
145ce502 | 1366 | pr_err("Failed association hash alloc\n"); |
1da177e4 LT |
1367 | status = -ENOMEM; |
1368 | goto err_ahash_alloc; | |
1369 | } | |
1370 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1371 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1372 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | /* Allocate and initialize the endpoint hash table. */ | |
1376 | sctp_ep_hashsize = 64; | |
1377 | sctp_ep_hashtable = (struct sctp_hashbucket *) | |
1378 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); | |
1379 | if (!sctp_ep_hashtable) { | |
145ce502 | 1380 | pr_err("Failed endpoint_hash alloc\n"); |
1da177e4 LT |
1381 | status = -ENOMEM; |
1382 | goto err_ehash_alloc; | |
1383 | } | |
1384 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1385 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1386 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | /* Allocate and initialize the SCTP port hash table. */ | |
1390 | do { | |
1391 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1392 | sizeof(struct sctp_bind_hashbucket); | |
1393 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1394 | continue; | |
1395 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
a84b50ce | 1396 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1397 | } while (!sctp_port_hashtable && --order > 0); |
1398 | if (!sctp_port_hashtable) { | |
145ce502 | 1399 | pr_err("Failed bind hash alloc\n"); |
1da177e4 LT |
1400 | status = -ENOMEM; |
1401 | goto err_bhash_alloc; | |
1402 | } | |
1403 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1404 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1405 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1406 | } |
1407 | ||
145ce502 | 1408 | pr_info("Hash tables configured (established %d bind %d)\n", |
1da177e4 LT |
1409 | sctp_assoc_hashsize, sctp_port_hashsize); |
1410 | ||
1411 | /* Disable ADDIP by default. */ | |
1412 | sctp_addip_enable = 0; | |
73d9c4fd | 1413 | sctp_addip_noauth = 0; |
9f7d653b | 1414 | sctp_default_auto_asconf = 0; |
1da177e4 LT |
1415 | |
1416 | /* Enable PR-SCTP by default. */ | |
1417 | sctp_prsctp_enable = 1; | |
1418 | ||
a29a5bd4 VY |
1419 | /* Disable AUTH by default. */ |
1420 | sctp_auth_enable = 0; | |
1421 | ||
72388433 BD |
1422 | /* Set SCOPE policy to enabled */ |
1423 | sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; | |
1424 | ||
90f2f531 VY |
1425 | /* Set the default rwnd update threshold */ |
1426 | sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; | |
1427 | ||
1da177e4 LT |
1428 | sctp_sysctl_register(); |
1429 | ||
1430 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1431 | sctp_v4_pf_init(); |
1432 | sctp_v6_pf_init(); | |
1da177e4 | 1433 | |
270637ab | 1434 | status = sctp_v4_protosw_init(); |
827bf122 | 1435 | |
1da177e4 | 1436 | if (status) |
270637ab VY |
1437 | goto err_protosw_init; |
1438 | ||
1439 | status = sctp_v6_protosw_init(); | |
1440 | if (status) | |
1441 | goto err_v6_protosw_init; | |
1da177e4 | 1442 | |
4db67e80 EB |
1443 | status = register_pernet_subsys(&sctp_net_ops); |
1444 | if (status) | |
1445 | goto err_register_pernet_subsys; | |
1446 | ||
270637ab VY |
1447 | status = sctp_v4_add_protocol(); |
1448 | if (status) | |
827bf122 | 1449 | goto err_add_protocol; |
827bf122 SS |
1450 | |
1451 | /* Register SCTP with inet6 layer. */ | |
1452 | status = sctp_v6_add_protocol(); | |
1453 | if (status) | |
1454 | goto err_v6_add_protocol; | |
1455 | ||
1da177e4 LT |
1456 | status = 0; |
1457 | out: | |
1458 | return status; | |
827bf122 | 1459 | err_v6_add_protocol: |
270637ab | 1460 | sctp_v4_del_protocol(); |
d1dd5247 | 1461 | err_add_protocol: |
4db67e80 EB |
1462 | unregister_pernet_subsys(&sctp_net_ops); |
1463 | err_register_pernet_subsys: | |
270637ab VY |
1464 | sctp_v6_protosw_exit(); |
1465 | err_v6_protosw_init: | |
1466 | sctp_v4_protosw_exit(); | |
1467 | err_protosw_init: | |
270637ab VY |
1468 | sctp_v4_pf_exit(); |
1469 | sctp_v6_pf_exit(); | |
1da177e4 | 1470 | sctp_sysctl_unregister(); |
1da177e4 LT |
1471 | free_pages((unsigned long)sctp_port_hashtable, |
1472 | get_order(sctp_port_hashsize * | |
1473 | sizeof(struct sctp_bind_hashbucket))); | |
1474 | err_bhash_alloc: | |
1475 | kfree(sctp_ep_hashtable); | |
1476 | err_ehash_alloc: | |
1477 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1478 | get_order(sctp_assoc_hashsize * | |
1479 | sizeof(struct sctp_hashbucket))); | |
1480 | err_ahash_alloc: | |
1481 | sctp_dbg_objcnt_exit(); | |
1da177e4 | 1482 | sctp_proc_exit(); |
827bf122 | 1483 | err_init_proc: |
1da177e4 LT |
1484 | cleanup_sctp_mibs(); |
1485 | err_init_mibs: | |
1486 | kmem_cache_destroy(sctp_chunk_cachep); | |
1487 | err_chunk_cachep: | |
1488 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1489 | goto out; |
1490 | } | |
1491 | ||
1492 | /* Exit handler for the SCTP protocol. */ | |
1493 | SCTP_STATIC __exit void sctp_exit(void) | |
1494 | { | |
1495 | /* BUG. This should probably do something useful like clean | |
1496 | * up all the remaining associations and all that memory. | |
1497 | */ | |
1498 | ||
827bf122 SS |
1499 | /* Unregister with inet6/inet layers. */ |
1500 | sctp_v6_del_protocol(); | |
270637ab | 1501 | sctp_v4_del_protocol(); |
1da177e4 | 1502 | |
4db67e80 EB |
1503 | unregister_pernet_subsys(&sctp_net_ops); |
1504 | ||
270637ab VY |
1505 | /* Free protosw registrations */ |
1506 | sctp_v6_protosw_exit(); | |
1507 | sctp_v4_protosw_exit(); | |
1508 | ||
827bf122 | 1509 | /* Unregister with socket layer. */ |
270637ab VY |
1510 | sctp_v6_pf_exit(); |
1511 | sctp_v4_pf_exit(); | |
827bf122 | 1512 | |
1da177e4 | 1513 | sctp_sysctl_unregister(); |
1da177e4 LT |
1514 | |
1515 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1516 | get_order(sctp_assoc_hashsize * | |
1517 | sizeof(struct sctp_hashbucket))); | |
1518 | kfree(sctp_ep_hashtable); | |
1519 | free_pages((unsigned long)sctp_port_hashtable, | |
1520 | get_order(sctp_port_hashsize * | |
1521 | sizeof(struct sctp_bind_hashbucket))); | |
1522 | ||
1da177e4 LT |
1523 | sctp_dbg_objcnt_exit(); |
1524 | sctp_proc_exit(); | |
1525 | cleanup_sctp_mibs(); | |
1526 | ||
eaa184a1 JDB |
1527 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1528 | ||
827bf122 SS |
1529 | kmem_cache_destroy(sctp_chunk_cachep); |
1530 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1531 | } |
1532 | ||
1533 | module_init(sctp_init); | |
1534 | module_exit(sctp_exit); | |
1535 | ||
bb97d31f ACM |
1536 | /* |
1537 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1538 | */ | |
1539 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1540 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
1da177e4 LT |
1541 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
1542 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); | |
06e86806 LN |
1543 | module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); |
1544 | MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); | |
1da177e4 | 1545 | MODULE_LICENSE("GPL"); |