Commit | Line | Data |
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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 | ||
49 | #include <linux/module.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/inetdevice.h> | |
53 | #include <linux/seq_file.h> | |
4d93df0a | 54 | #include <linux/bootmem.h> |
845525a6 VY |
55 | #include <linux/highmem.h> |
56 | #include <linux/swap.h> | |
457c4cbc | 57 | #include <net/net_namespace.h> |
1da177e4 LT |
58 | #include <net/protocol.h> |
59 | #include <net/ip.h> | |
60 | #include <net/ipv6.h> | |
14c85021 | 61 | #include <net/route.h> |
1da177e4 LT |
62 | #include <net/sctp/sctp.h> |
63 | #include <net/addrconf.h> | |
64 | #include <net/inet_common.h> | |
65 | #include <net/inet_ecn.h> | |
66 | ||
67 | /* Global data structures. */ | |
4cbf1cae | 68 | struct sctp_globals sctp_globals __read_mostly; |
ba89966c | 69 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
1da177e4 | 70 | |
c4e85f82 FW |
71 | #ifdef CONFIG_PROC_FS |
72 | struct proc_dir_entry *proc_net_sctp; | |
73 | #endif | |
74 | ||
1da177e4 LT |
75 | struct idr sctp_assocs_id; |
76 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
77 | ||
78 | /* This is the global socket data structure used for responding to | |
79 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
80 | * for this socket at the initialization time. | |
81 | */ | |
8258175c | 82 | static struct sock *sctp_ctl_sock; |
1da177e4 LT |
83 | |
84 | static struct sctp_pf *sctp_pf_inet6_specific; | |
85 | static struct sctp_pf *sctp_pf_inet_specific; | |
86 | static struct sctp_af *sctp_af_v4_specific; | |
87 | static struct sctp_af *sctp_af_v6_specific; | |
88 | ||
e18b890b CL |
89 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
90 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 91 | |
007e3936 VY |
92 | int sysctl_sctp_mem[3]; |
93 | int sysctl_sctp_rmem[3]; | |
94 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 95 | |
1da177e4 LT |
96 | /* Return the address of the control sock. */ |
97 | struct sock *sctp_get_ctl_sock(void) | |
98 | { | |
8258175c | 99 | return sctp_ctl_sock; |
1da177e4 LT |
100 | } |
101 | ||
102 | /* Set up the proc fs entry for the SCTP protocol. */ | |
103 | static __init int sctp_proc_init(void) | |
104 | { | |
1748376b ED |
105 | if (percpu_counter_init(&sctp_sockets_allocated, 0)) |
106 | goto out_nomem; | |
c4e85f82 | 107 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
108 | if (!proc_net_sctp) { |
109 | struct proc_dir_entry *ent; | |
457c4cbc | 110 | ent = proc_mkdir("sctp", init_net.proc_net); |
1da177e4 LT |
111 | if (ent) { |
112 | ent->owner = THIS_MODULE; | |
113 | proc_net_sctp = ent; | |
114 | } else | |
1748376b | 115 | goto out_free_percpu; |
1da177e4 LT |
116 | } |
117 | ||
118 | if (sctp_snmp_proc_init()) | |
80896a35 | 119 | goto out_snmp_proc_init; |
1da177e4 | 120 | if (sctp_eps_proc_init()) |
80896a35 | 121 | goto out_eps_proc_init; |
1da177e4 | 122 | if (sctp_assocs_proc_init()) |
80896a35 | 123 | goto out_assocs_proc_init; |
20c2c1fd | 124 | if (sctp_remaddr_proc_init()) |
caea902f | 125 | goto out_remaddr_proc_init; |
1da177e4 LT |
126 | |
127 | return 0; | |
128 | ||
caea902f | 129 | out_remaddr_proc_init: |
3d00fb9e | 130 | sctp_assocs_proc_exit(); |
80896a35 WY |
131 | out_assocs_proc_init: |
132 | sctp_eps_proc_exit(); | |
133 | out_eps_proc_init: | |
134 | sctp_snmp_proc_exit(); | |
135 | out_snmp_proc_init: | |
136 | if (proc_net_sctp) { | |
137 | proc_net_sctp = NULL; | |
138 | remove_proc_entry("sctp", init_net.proc_net); | |
139 | } | |
1748376b ED |
140 | out_free_percpu: |
141 | percpu_counter_destroy(&sctp_sockets_allocated); | |
c4e85f82 FW |
142 | #else |
143 | return 0; | |
144 | #endif /* CONFIG_PROC_FS */ | |
157653ce RD |
145 | |
146 | out_nomem: | |
147 | return -ENOMEM; | |
1da177e4 LT |
148 | } |
149 | ||
d808ad9a | 150 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
151 | * Note: Do not make this __exit as it is used in the init error |
152 | * path. | |
153 | */ | |
154 | static void sctp_proc_exit(void) | |
155 | { | |
c4e85f82 | 156 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
157 | sctp_snmp_proc_exit(); |
158 | sctp_eps_proc_exit(); | |
159 | sctp_assocs_proc_exit(); | |
20c2c1fd | 160 | sctp_remaddr_proc_exit(); |
1da177e4 LT |
161 | |
162 | if (proc_net_sctp) { | |
163 | proc_net_sctp = NULL; | |
457c4cbc | 164 | remove_proc_entry("sctp", init_net.proc_net); |
1da177e4 | 165 | } |
c4e85f82 | 166 | #endif |
1da177e4 LT |
167 | } |
168 | ||
169 | /* Private helper to extract ipv4 address and stash them in | |
170 | * the protocol structure. | |
171 | */ | |
172 | static 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(); | |
e5ed6399 | 180 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
181 | 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) { | |
2a6fd78a AV |
189 | 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; | |
29303547 VY |
192 | addr->valid = 1; |
193 | INIT_LIST_HEAD(&addr->list); | |
194 | INIT_RCU_HEAD(&addr->rcu); | |
1da177e4 LT |
195 | list_add_tail(&addr->list, addrlist); |
196 | } | |
197 | } | |
198 | ||
199 | rcu_read_unlock(); | |
200 | } | |
201 | ||
202 | /* Extract our IP addresses from the system and stash them in the | |
203 | * protocol structure. | |
204 | */ | |
29c7cf96 | 205 | static void sctp_get_local_addr_list(void) |
1da177e4 LT |
206 | { |
207 | struct net_device *dev; | |
208 | struct list_head *pos; | |
209 | struct sctp_af *af; | |
210 | ||
211 | read_lock(&dev_base_lock); | |
881d966b | 212 | for_each_netdev(&init_net, dev) { |
1da177e4 LT |
213 | __list_for_each(pos, &sctp_address_families) { |
214 | af = list_entry(pos, struct sctp_af, list); | |
215 | af->copy_addrlist(&sctp_local_addr_list, dev); | |
216 | } | |
217 | } | |
218 | read_unlock(&dev_base_lock); | |
219 | } | |
220 | ||
1da177e4 | 221 | /* Free the existing local addresses. */ |
29c7cf96 | 222 | static void sctp_free_local_addr_list(void) |
1da177e4 LT |
223 | { |
224 | struct sctp_sockaddr_entry *addr; | |
225 | struct list_head *pos, *temp; | |
226 | ||
227 | list_for_each_safe(pos, temp, &sctp_local_addr_list) { | |
228 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
229 | list_del(pos); | |
230 | kfree(addr); | |
231 | } | |
232 | } | |
233 | ||
29303547 VY |
234 | void sctp_local_addr_free(struct rcu_head *head) |
235 | { | |
236 | struct sctp_sockaddr_entry *e = container_of(head, | |
237 | struct sctp_sockaddr_entry, rcu); | |
238 | kfree(e); | |
239 | } | |
240 | ||
1da177e4 LT |
241 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
242 | int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, | |
dd0fc66f | 243 | gfp_t gfp, int copy_flags) |
1da177e4 LT |
244 | { |
245 | struct sctp_sockaddr_entry *addr; | |
246 | int error = 0; | |
1da177e4 | 247 | |
29303547 VY |
248 | rcu_read_lock(); |
249 | list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { | |
250 | if (!addr->valid) | |
251 | continue; | |
6244be4e | 252 | if (sctp_in_scope(&addr->a, scope)) { |
1da177e4 LT |
253 | /* Now that the address is in scope, check to see if |
254 | * the address type is really supported by the local | |
255 | * sock as well as the remote peer. | |
256 | */ | |
6244be4e | 257 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 258 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 259 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
260 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
261 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
262 | error = sctp_add_bind_addr(bp, &addr->a, |
263 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
264 | if (error) |
265 | goto end_copy; | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | end_copy: | |
29303547 | 271 | rcu_read_unlock(); |
1da177e4 LT |
272 | return error; |
273 | } | |
274 | ||
275 | /* Initialize a sctp_addr from in incoming skb. */ | |
276 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
277 | int is_saddr) | |
278 | { | |
279 | void *from; | |
d55c41b1 | 280 | __be16 *port; |
1da177e4 LT |
281 | struct sctphdr *sh; |
282 | ||
283 | port = &addr->v4.sin_port; | |
284 | addr->v4.sin_family = AF_INET; | |
285 | ||
2c0fd387 | 286 | sh = sctp_hdr(skb); |
1da177e4 | 287 | if (is_saddr) { |
d55c41b1 | 288 | *port = sh->source; |
eddc9ec5 | 289 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 290 | } else { |
d55c41b1 | 291 | *port = sh->dest; |
eddc9ec5 | 292 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
293 | } |
294 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
295 | } | |
296 | ||
297 | /* Initialize an sctp_addr from a socket. */ | |
298 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
299 | { | |
300 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 301 | addr->v4.sin_port = 0; |
1da177e4 LT |
302 | addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; |
303 | } | |
304 | ||
305 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
306 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
307 | { | |
308 | inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; | |
309 | } | |
310 | ||
311 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
312 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
313 | { | |
314 | inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; | |
315 | } | |
316 | ||
317 | /* Initialize a sctp_addr from an address parameter. */ | |
318 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
319 | union sctp_addr_param *param, | |
dd86d136 | 320 | __be16 port, int iif) |
1da177e4 LT |
321 | { |
322 | addr->v4.sin_family = AF_INET; | |
323 | addr->v4.sin_port = port; | |
324 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
325 | } | |
326 | ||
327 | /* Initialize an address parameter from a sctp_addr and return the length | |
328 | * of the address parameter. | |
329 | */ | |
330 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
331 | union sctp_addr_param *param) | |
332 | { | |
333 | int length = sizeof(sctp_ipv4addr_param_t); | |
334 | ||
335 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 336 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 337 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
338 | |
339 | return length; | |
340 | } | |
341 | ||
342 | /* Initialize a sctp_addr from a dst_entry. */ | |
343 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, | |
854d43a4 | 344 | __be16 port) |
1da177e4 LT |
345 | { |
346 | struct rtable *rt = (struct rtable *)dst; | |
347 | saddr->v4.sin_family = AF_INET; | |
348 | saddr->v4.sin_port = port; | |
349 | saddr->v4.sin_addr.s_addr = rt->rt_src; | |
350 | } | |
351 | ||
352 | /* Compare two addresses exactly. */ | |
353 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
354 | const union sctp_addr *addr2) | |
355 | { | |
356 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
357 | return 0; | |
358 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
359 | return 0; | |
360 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
361 | return 0; | |
362 | ||
363 | return 1; | |
364 | } | |
365 | ||
366 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 367 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
368 | { |
369 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 370 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
371 | addr->v4.sin_port = port; |
372 | } | |
373 | ||
374 | /* Is this a wildcard address? */ | |
375 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
376 | { | |
e6f1cebf | 377 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
378 | } |
379 | ||
380 | /* This function checks if the address is a valid address to be used for | |
381 | * SCTP binding. | |
382 | * | |
383 | * Output: | |
384 | * Return 0 - If the address is a non-unicast or an illegal address. | |
385 | * Return 1 - If the address is a unicast. | |
386 | */ | |
5636bef7 VY |
387 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
388 | struct sctp_sock *sp, | |
389 | const struct sk_buff *skb) | |
1da177e4 | 390 | { |
7dab83de VY |
391 | /* IPv4 addresses not allowed */ |
392 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
393 | return 0; | |
394 | ||
1da177e4 | 395 | /* Is this a non-unicast address or a unusable SCTP address? */ |
b5cb2bbc | 396 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
397 | return 0; |
398 | ||
d808ad9a | 399 | /* Is this a broadcast address? */ |
ee6b9673 | 400 | if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) |
d808ad9a | 401 | return 0; |
5636bef7 | 402 | |
1da177e4 LT |
403 | return 1; |
404 | } | |
405 | ||
406 | /* Should this be available for binding? */ | |
407 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
408 | { | |
6b175b26 | 409 | int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); |
1da177e4 | 410 | |
1da177e4 | 411 | |
e6f1cebf | 412 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
413 | ret != RTN_LOCAL && |
414 | !sp->inet.freebind && | |
415 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 416 | return 0; |
cdac4e07 | 417 | |
7dab83de VY |
418 | if (ipv6_only_sock(sctp_opt2sk(sp))) |
419 | return 0; | |
420 | ||
1da177e4 LT |
421 | return 1; |
422 | } | |
423 | ||
424 | /* Checking the loopback, private and other address scopes as defined in | |
425 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
426 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
427 | * | |
428 | * Level 0 - unusable SCTP addresses | |
429 | * Level 1 - loopback address | |
430 | * Level 2 - link-local addresses | |
431 | * Level 3 - private addresses. | |
432 | * Level 4 - global addresses | |
433 | * For INIT and INIT-ACK address list, let L be the level of | |
434 | * of requested destination address, sender and receiver | |
435 | * SHOULD include all of its addresses with level greater | |
436 | * than or equal to L. | |
437 | */ | |
438 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
439 | { | |
440 | sctp_scope_t retval; | |
441 | ||
442 | /* Should IPv4 scoping be a sysctl configurable option | |
443 | * so users can turn it off (default on) for certain | |
444 | * unconventional networking environments? | |
445 | */ | |
446 | ||
447 | /* Check for unusable SCTP addresses. */ | |
b5cb2bbc | 448 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 449 | retval = SCTP_SCOPE_UNUSABLE; |
b5cb2bbc | 450 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 451 | retval = SCTP_SCOPE_LOOPBACK; |
b5cb2bbc | 452 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 453 | retval = SCTP_SCOPE_LINK; |
b5cb2bbc JP |
454 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
455 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || | |
456 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { | |
1da177e4 LT |
457 | retval = SCTP_SCOPE_PRIVATE; |
458 | } else { | |
459 | retval = SCTP_SCOPE_GLOBAL; | |
460 | } | |
461 | ||
462 | return retval; | |
463 | } | |
464 | ||
465 | /* Returns a valid dst cache entry for the given source and destination ip | |
466 | * addresses. If an association is passed, trys to get a dst entry with a | |
467 | * source address that matches an address in the bind address list. | |
468 | */ | |
469 | static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, | |
470 | union sctp_addr *daddr, | |
471 | union sctp_addr *saddr) | |
472 | { | |
473 | struct rtable *rt; | |
474 | struct flowi fl; | |
475 | struct sctp_bind_addr *bp; | |
1da177e4 | 476 | struct sctp_sockaddr_entry *laddr; |
1da177e4 LT |
477 | struct dst_entry *dst = NULL; |
478 | union sctp_addr dst_saddr; | |
479 | ||
480 | memset(&fl, 0x0, sizeof(struct flowi)); | |
481 | fl.fl4_dst = daddr->v4.sin_addr.s_addr; | |
482 | fl.proto = IPPROTO_SCTP; | |
483 | if (asoc) { | |
484 | fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); | |
485 | fl.oif = asoc->base.sk->sk_bound_dev_if; | |
486 | } | |
487 | if (saddr) | |
488 | fl.fl4_src = saddr->v4.sin_addr.s_addr; | |
489 | ||
21454aaa HH |
490 | SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", |
491 | __func__, &fl.fl4_dst, &fl.fl4_src); | |
1da177e4 | 492 | |
f206351a | 493 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
494 | dst = &rt->u.dst; |
495 | } | |
496 | ||
497 | /* If there is no association or if a source address is passed, no | |
498 | * more validation is required. | |
499 | */ | |
500 | if (!asoc || saddr) | |
501 | goto out; | |
502 | ||
503 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
504 | |
505 | if (dst) { | |
506 | /* Walk through the bind address list and look for a bind | |
507 | * address that matches the source address of the returned dst. | |
508 | */ | |
159c6bea | 509 | sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); |
559cf710 VY |
510 | rcu_read_lock(); |
511 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
f57d96b2 | 512 | if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) |
dc022a98 | 513 | continue; |
854d43a4 | 514 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
515 | goto out_unlock; |
516 | } | |
559cf710 | 517 | rcu_read_unlock(); |
1da177e4 LT |
518 | |
519 | /* None of the bound addresses match the source address of the | |
520 | * dst. So release it. | |
521 | */ | |
522 | dst_release(dst); | |
523 | dst = NULL; | |
524 | } | |
525 | ||
526 | /* Walk through the bind address list and try to get a dst that | |
527 | * matches a bind address as the source address. | |
528 | */ | |
559cf710 VY |
529 | rcu_read_lock(); |
530 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
531 | if (!laddr->valid) | |
532 | continue; | |
f57d96b2 | 533 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e AV |
534 | (AF_INET == laddr->a.sa.sa_family)) { |
535 | fl.fl4_src = laddr->a.v4.sin_addr.s_addr; | |
f206351a | 536 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
537 | dst = &rt->u.dst; |
538 | goto out_unlock; | |
539 | } | |
540 | } | |
541 | } | |
542 | ||
543 | out_unlock: | |
559cf710 | 544 | rcu_read_unlock(); |
1da177e4 LT |
545 | out: |
546 | if (dst) | |
21454aaa HH |
547 | SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", |
548 | &rt->rt_dst, &rt->rt_src); | |
1da177e4 LT |
549 | else |
550 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
551 | ||
552 | return dst; | |
553 | } | |
554 | ||
555 | /* For v4, the source address is cached in the route entry(dst). So no need | |
556 | * to cache it separately and hence this is an empty routine. | |
557 | */ | |
e5117101 YH |
558 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
559 | struct sctp_association *asoc, | |
1da177e4 LT |
560 | struct dst_entry *dst, |
561 | union sctp_addr *daddr, | |
562 | union sctp_addr *saddr) | |
563 | { | |
564 | struct rtable *rt = (struct rtable *)dst; | |
565 | ||
23ec47a0 VY |
566 | if (!asoc) |
567 | return; | |
568 | ||
1da177e4 LT |
569 | if (rt) { |
570 | saddr->v4.sin_family = AF_INET; | |
d3f7a54a | 571 | saddr->v4.sin_port = htons(asoc->base.bind_addr.port); |
d808ad9a | 572 | saddr->v4.sin_addr.s_addr = rt->rt_src; |
1da177e4 LT |
573 | } |
574 | } | |
575 | ||
576 | /* What interface did this skb arrive on? */ | |
577 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
578 | { | |
ee6b9673 | 579 | return skb->rtable->rt_iif; |
1da177e4 LT |
580 | } |
581 | ||
582 | /* Was this packet marked by Explicit Congestion Notification? */ | |
583 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
584 | { | |
eddc9ec5 | 585 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
586 | } |
587 | ||
588 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
589 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
590 | struct sctp_association *asoc) | |
591 | { | |
592 | struct inet_sock *inet = inet_sk(sk); | |
593 | struct inet_sock *newinet; | |
3b1e0a65 | 594 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 595 | sk->sk_prot); |
1da177e4 LT |
596 | |
597 | if (!newsk) | |
598 | goto out; | |
599 | ||
600 | sock_init_data(NULL, newsk); | |
601 | ||
602 | newsk->sk_type = SOCK_STREAM; | |
603 | ||
604 | newsk->sk_no_check = sk->sk_no_check; | |
605 | newsk->sk_reuse = sk->sk_reuse; | |
606 | newsk->sk_shutdown = sk->sk_shutdown; | |
607 | ||
608 | newsk->sk_destruct = inet_sock_destruct; | |
609 | newsk->sk_family = PF_INET; | |
610 | newsk->sk_protocol = IPPROTO_SCTP; | |
611 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
612 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
613 | ||
614 | newinet = inet_sk(newsk); | |
615 | ||
616 | /* Initialize sk's sport, dport, rcv_saddr and daddr for | |
617 | * getsockname() and getpeername() | |
618 | */ | |
619 | newinet->sport = inet->sport; | |
620 | newinet->saddr = inet->saddr; | |
621 | newinet->rcv_saddr = inet->rcv_saddr; | |
622 | newinet->dport = htons(asoc->peer.port); | |
623 | newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; | |
624 | newinet->pmtudisc = inet->pmtudisc; | |
d808ad9a | 625 | newinet->id = asoc->next_tsn ^ jiffies; |
1da177e4 LT |
626 | |
627 | newinet->uc_ttl = -1; | |
628 | newinet->mc_loop = 1; | |
629 | newinet->mc_ttl = 1; | |
630 | newinet->mc_index = 0; | |
631 | newinet->mc_list = NULL; | |
632 | ||
e6848976 | 633 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
634 | |
635 | if (newsk->sk_prot->init(newsk)) { | |
636 | sk_common_release(newsk); | |
637 | newsk = NULL; | |
638 | } | |
639 | ||
640 | out: | |
641 | return newsk; | |
642 | } | |
643 | ||
644 | /* Map address, empty for v4 family */ | |
645 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
646 | { | |
647 | /* Empty */ | |
648 | } | |
649 | ||
650 | /* Dump the v4 addr to the seq file. */ | |
651 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
652 | { | |
21454aaa | 653 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
1da177e4 LT |
654 | } |
655 | ||
b9031d9d VY |
656 | static void sctp_v4_ecn_capable(struct sock *sk) |
657 | { | |
658 | INET_ECN_xmit(sk); | |
659 | } | |
660 | ||
29303547 VY |
661 | /* Event handler for inet address addition/deletion events. |
662 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
663 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
664 | * time and thus corrupt the list. | |
665 | * The reader side is protected with RCU. | |
666 | */ | |
24123186 AB |
667 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
668 | void *ptr) | |
1da177e4 | 669 | { |
29c7cf96 | 670 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
671 | struct sctp_sockaddr_entry *addr = NULL; |
672 | struct sctp_sockaddr_entry *temp; | |
22626216 | 673 | int found = 0; |
1da177e4 | 674 | |
721499e8 | 675 | if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) |
6133fb1a DL |
676 | return NOTIFY_DONE; |
677 | ||
29c7cf96 SS |
678 | switch (ev) { |
679 | case NETDEV_UP: | |
680 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
681 | if (addr) { | |
682 | addr->a.v4.sin_family = AF_INET; | |
683 | addr->a.v4.sin_port = 0; | |
684 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
685 | addr->valid = 1; |
686 | spin_lock_bh(&sctp_local_addr_lock); | |
687 | list_add_tail_rcu(&addr->list, &sctp_local_addr_list); | |
688 | spin_unlock_bh(&sctp_local_addr_lock); | |
29c7cf96 SS |
689 | } |
690 | break; | |
691 | case NETDEV_DOWN: | |
29303547 VY |
692 | spin_lock_bh(&sctp_local_addr_lock); |
693 | list_for_each_entry_safe(addr, temp, | |
694 | &sctp_local_addr_list, list) { | |
a40a7d15 PE |
695 | if (addr->a.sa.sa_family == AF_INET && |
696 | addr->a.v4.sin_addr.s_addr == | |
697 | ifa->ifa_local) { | |
22626216 | 698 | found = 1; |
29303547 VY |
699 | addr->valid = 0; |
700 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
701 | break; |
702 | } | |
703 | } | |
29303547 | 704 | spin_unlock_bh(&sctp_local_addr_lock); |
22626216 | 705 | if (found) |
29303547 | 706 | call_rcu(&addr->rcu, sctp_local_addr_free); |
29c7cf96 SS |
707 | break; |
708 | } | |
1da177e4 LT |
709 | |
710 | return NOTIFY_DONE; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Initialize the control inode/socket with a control endpoint data | |
715 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
716 | */ | |
717 | static int sctp_ctl_sock_init(void) | |
718 | { | |
719 | int err; | |
720 | sa_family_t family; | |
721 | ||
722 | if (sctp_get_pf_specific(PF_INET6)) | |
723 | family = PF_INET6; | |
724 | else | |
725 | family = PF_INET; | |
726 | ||
eee4fe4d | 727 | err = inet_ctl_sock_create(&sctp_ctl_sock, family, |
5677242f | 728 | SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); |
1da177e4 LT |
729 | if (err < 0) { |
730 | printk(KERN_ERR | |
731 | "SCTP: Failed to create the SCTP control socket.\n"); | |
732 | return err; | |
733 | } | |
1da177e4 LT |
734 | return 0; |
735 | } | |
736 | ||
737 | /* Register address family specific functions. */ | |
738 | int sctp_register_af(struct sctp_af *af) | |
739 | { | |
740 | switch (af->sa_family) { | |
741 | case AF_INET: | |
742 | if (sctp_af_v4_specific) | |
743 | return 0; | |
744 | sctp_af_v4_specific = af; | |
745 | break; | |
746 | case AF_INET6: | |
747 | if (sctp_af_v6_specific) | |
748 | return 0; | |
749 | sctp_af_v6_specific = af; | |
750 | break; | |
751 | default: | |
752 | return 0; | |
753 | } | |
754 | ||
755 | INIT_LIST_HEAD(&af->list); | |
756 | list_add_tail(&af->list, &sctp_address_families); | |
757 | return 1; | |
758 | } | |
759 | ||
760 | /* Get the table of functions for manipulating a particular address | |
761 | * family. | |
762 | */ | |
763 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
764 | { | |
765 | switch (family) { | |
766 | case AF_INET: | |
767 | return sctp_af_v4_specific; | |
768 | case AF_INET6: | |
769 | return sctp_af_v6_specific; | |
770 | default: | |
771 | return NULL; | |
772 | } | |
773 | } | |
774 | ||
775 | /* Common code to initialize a AF_INET msg_name. */ | |
776 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
777 | { | |
778 | struct sockaddr_in *sin; | |
779 | ||
780 | sin = (struct sockaddr_in *)msgname; | |
781 | *addr_len = sizeof(struct sockaddr_in); | |
782 | sin->sin_family = AF_INET; | |
783 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
784 | } | |
785 | ||
786 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
787 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
788 | int *addr_len) | |
789 | { | |
790 | struct sockaddr_in *sin, *sinfrom; | |
791 | ||
792 | if (msgname) { | |
793 | struct sctp_association *asoc; | |
794 | ||
795 | asoc = event->asoc; | |
796 | sctp_inet_msgname(msgname, addr_len); | |
797 | sin = (struct sockaddr_in *)msgname; | |
798 | sinfrom = &asoc->peer.primary_addr.v4; | |
799 | sin->sin_port = htons(asoc->peer.port); | |
800 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
801 | } | |
802 | } | |
803 | ||
804 | /* Initialize and copy out a msgname from an inbound skb. */ | |
805 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
806 | { | |
1da177e4 | 807 | if (msgname) { |
2c0fd387 ACM |
808 | struct sctphdr *sh = sctp_hdr(skb); |
809 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
810 | ||
1da177e4 | 811 | sctp_inet_msgname(msgname, len); |
1da177e4 | 812 | sin->sin_port = sh->source; |
eddc9ec5 | 813 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
814 | } |
815 | } | |
816 | ||
817 | /* Do we support this AF? */ | |
818 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
819 | { | |
820 | /* PF_INET only supports AF_INET addresses. */ | |
821 | return (AF_INET == family); | |
822 | } | |
823 | ||
824 | /* Address matching with wildcards allowed. */ | |
825 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
826 | const union sctp_addr *addr2, | |
827 | struct sctp_sock *opt) | |
828 | { | |
829 | /* PF_INET only supports AF_INET addresses. */ | |
830 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
831 | return 0; | |
e6f1cebf AV |
832 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
833 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
834 | return 1; |
835 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
836 | return 1; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | /* Verify that provided sockaddr looks bindable. Common verification has | |
842 | * already been taken care of. | |
843 | */ | |
844 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
845 | { | |
846 | return sctp_v4_available(addr, opt); | |
847 | } | |
848 | ||
849 | /* Verify that sockaddr looks sendable. Common verification has already | |
850 | * been taken care of. | |
851 | */ | |
852 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
853 | { | |
854 | return 1; | |
855 | } | |
856 | ||
857 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
858 | * chunks. Returns number of addresses supported. | |
859 | */ | |
860 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 861 | __be16 *types) |
1da177e4 LT |
862 | { |
863 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
864 | return 1; | |
865 | } | |
866 | ||
867 | /* Wrapper routine that calls the ip transmit routine. */ | |
868 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
f880374c | 869 | struct sctp_transport *transport) |
1da177e4 | 870 | { |
f880374c HX |
871 | struct inet_sock *inet = inet_sk(skb->sk); |
872 | ||
21454aaa | 873 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", |
0dc47877 | 874 | __func__, skb, skb->len, |
21454aaa HH |
875 | &skb->rtable->rt_src, |
876 | &skb->rtable->rt_dst); | |
1da177e4 | 877 | |
f880374c HX |
878 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
879 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; | |
880 | ||
1da177e4 | 881 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); |
f880374c | 882 | return ip_queue_xmit(skb, 0); |
1da177e4 LT |
883 | } |
884 | ||
15efbe76 | 885 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
886 | |
887 | static struct sctp_pf sctp_pf_inet = { | |
888 | .event_msgname = sctp_inet_event_msgname, | |
889 | .skb_msgname = sctp_inet_skb_msgname, | |
890 | .af_supported = sctp_inet_af_supported, | |
891 | .cmp_addr = sctp_inet_cmp_addr, | |
892 | .bind_verify = sctp_inet_bind_verify, | |
893 | .send_verify = sctp_inet_send_verify, | |
894 | .supported_addrs = sctp_inet_supported_addrs, | |
895 | .create_accept_sk = sctp_v4_create_accept_sk, | |
896 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 897 | .af = &sctp_af_inet |
1da177e4 LT |
898 | }; |
899 | ||
900 | /* Notifier for inetaddr addition/deletion events. */ | |
901 | static struct notifier_block sctp_inetaddr_notifier = { | |
902 | .notifier_call = sctp_inetaddr_event, | |
903 | }; | |
904 | ||
905 | /* Socket operations. */ | |
90ddc4f0 | 906 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
907 | .family = PF_INET, |
908 | .owner = THIS_MODULE, | |
909 | .release = inet_release, /* Needs to be wrapped... */ | |
910 | .bind = inet_bind, | |
911 | .connect = inet_dgram_connect, | |
912 | .socketpair = sock_no_socketpair, | |
913 | .accept = inet_accept, | |
914 | .getname = inet_getname, /* Semantics are different. */ | |
915 | .poll = sctp_poll, | |
916 | .ioctl = inet_ioctl, | |
917 | .listen = sctp_inet_listen, | |
918 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
919 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
920 | .getsockopt = sock_common_getsockopt, | |
921 | .sendmsg = inet_sendmsg, | |
922 | .recvmsg = sock_common_recvmsg, | |
923 | .mmap = sock_no_mmap, | |
924 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 925 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
926 | .compat_setsockopt = compat_sock_common_setsockopt, |
927 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 928 | #endif |
1da177e4 LT |
929 | }; |
930 | ||
931 | /* Registration with AF_INET family. */ | |
932 | static struct inet_protosw sctp_seqpacket_protosw = { | |
933 | .type = SOCK_SEQPACKET, | |
934 | .protocol = IPPROTO_SCTP, | |
935 | .prot = &sctp_prot, | |
936 | .ops = &inet_seqpacket_ops, | |
937 | .capability = -1, | |
938 | .no_check = 0, | |
939 | .flags = SCTP_PROTOSW_FLAG | |
940 | }; | |
941 | static struct inet_protosw sctp_stream_protosw = { | |
942 | .type = SOCK_STREAM, | |
943 | .protocol = IPPROTO_SCTP, | |
944 | .prot = &sctp_prot, | |
945 | .ops = &inet_seqpacket_ops, | |
946 | .capability = -1, | |
947 | .no_check = 0, | |
948 | .flags = SCTP_PROTOSW_FLAG | |
949 | }; | |
950 | ||
951 | /* Register with IP layer. */ | |
952 | static struct net_protocol sctp_protocol = { | |
953 | .handler = sctp_rcv, | |
954 | .err_handler = sctp_v4_err, | |
955 | .no_policy = 1, | |
956 | }; | |
957 | ||
958 | /* IPv4 address related functions. */ | |
15efbe76 | 959 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
960 | .sa_family = AF_INET, |
961 | .sctp_xmit = sctp_v4_xmit, | |
962 | .setsockopt = ip_setsockopt, | |
963 | .getsockopt = ip_getsockopt, | |
964 | .get_dst = sctp_v4_get_dst, | |
965 | .get_saddr = sctp_v4_get_saddr, | |
966 | .copy_addrlist = sctp_v4_copy_addrlist, | |
967 | .from_skb = sctp_v4_from_skb, | |
968 | .from_sk = sctp_v4_from_sk, | |
969 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
970 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
971 | .from_addr_param = sctp_v4_from_addr_param, | |
972 | .to_addr_param = sctp_v4_to_addr_param, | |
973 | .dst_saddr = sctp_v4_dst_saddr, | |
974 | .cmp_addr = sctp_v4_cmp_addr, | |
975 | .addr_valid = sctp_v4_addr_valid, | |
976 | .inaddr_any = sctp_v4_inaddr_any, | |
977 | .is_any = sctp_v4_is_any, | |
978 | .available = sctp_v4_available, | |
979 | .scope = sctp_v4_scope, | |
980 | .skb_iif = sctp_v4_skb_iif, | |
981 | .is_ce = sctp_v4_is_ce, | |
982 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 983 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
984 | .net_header_len = sizeof(struct iphdr), |
985 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 986 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
987 | .compat_setsockopt = compat_ip_setsockopt, |
988 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 989 | #endif |
1da177e4 LT |
990 | }; |
991 | ||
992 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { | |
993 | ||
994 | switch (family) { | |
995 | case PF_INET: | |
996 | return sctp_pf_inet_specific; | |
997 | case PF_INET6: | |
998 | return sctp_pf_inet6_specific; | |
999 | default: | |
1000 | return NULL; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* Register the PF specific function table. */ | |
1005 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
1006 | { | |
1007 | switch (family) { | |
1008 | case PF_INET: | |
1009 | if (sctp_pf_inet_specific) | |
1010 | return 0; | |
1011 | sctp_pf_inet_specific = pf; | |
1012 | break; | |
1013 | case PF_INET6: | |
1014 | if (sctp_pf_inet6_specific) | |
1015 | return 0; | |
1016 | sctp_pf_inet6_specific = pf; | |
1017 | break; | |
1018 | default: | |
1019 | return 0; | |
1020 | } | |
1021 | return 1; | |
1022 | } | |
1023 | ||
996b1dba YH |
1024 | static inline int init_sctp_mibs(void) |
1025 | { | |
1026 | return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); | |
1da177e4 LT |
1027 | } |
1028 | ||
996b1dba | 1029 | static inline void cleanup_sctp_mibs(void) |
1da177e4 | 1030 | { |
996b1dba | 1031 | snmp_mib_free((void**)sctp_statistics); |
1da177e4 LT |
1032 | } |
1033 | ||
270637ab VY |
1034 | static void sctp_v4_pf_init(void) |
1035 | { | |
1036 | /* Initialize the SCTP specific PF functions. */ | |
1037 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1038 | sctp_register_af(&sctp_af_inet); | |
1039 | } | |
1040 | ||
1041 | static void sctp_v4_pf_exit(void) | |
1042 | { | |
1043 | list_del(&sctp_af_inet.list); | |
1044 | } | |
1045 | ||
1046 | static int sctp_v4_protosw_init(void) | |
1047 | { | |
1048 | int rc; | |
1049 | ||
1050 | rc = proto_register(&sctp_prot, 1); | |
1051 | if (rc) | |
1052 | return rc; | |
1053 | ||
1054 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1055 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1056 | inet_register_protosw(&sctp_stream_protosw); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static void sctp_v4_protosw_exit(void) | |
1062 | { | |
1063 | inet_unregister_protosw(&sctp_stream_protosw); | |
1064 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1065 | proto_unregister(&sctp_prot); | |
1066 | } | |
1067 | ||
1068 | static int sctp_v4_add_protocol(void) | |
1069 | { | |
1070 | /* Register notifier for inet address additions/deletions. */ | |
1071 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1072 | ||
1073 | /* Register SCTP with inet layer. */ | |
1074 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1075 | return -EAGAIN; | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static void sctp_v4_del_protocol(void) | |
1081 | { | |
1082 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1083 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1084 | } | |
1085 | ||
1da177e4 LT |
1086 | /* Initialize the universe into something sensible. */ |
1087 | SCTP_STATIC __init int sctp_init(void) | |
1088 | { | |
1089 | int i; | |
1090 | int status = -EINVAL; | |
1091 | unsigned long goal; | |
4d93df0a | 1092 | unsigned long limit; |
845525a6 | 1093 | unsigned long nr_pages; |
4d93df0a | 1094 | int max_share; |
1da177e4 LT |
1095 | int order; |
1096 | ||
1097 | /* SCTP_DEBUG sanity check. */ | |
1098 | if (!sctp_sanity_check()) | |
1099 | goto out; | |
1100 | ||
827bf122 | 1101 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1102 | status = -ENOBUFS; |
1103 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1104 | sizeof(struct sctp_bind_bucket), | |
1105 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1106 | NULL); |
1da177e4 | 1107 | if (!sctp_bucket_cachep) |
827bf122 | 1108 | goto out; |
1da177e4 LT |
1109 | |
1110 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1111 | sizeof(struct sctp_chunk), | |
1112 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1113 | NULL); |
1da177e4 LT |
1114 | if (!sctp_chunk_cachep) |
1115 | goto err_chunk_cachep; | |
1116 | ||
1117 | /* Allocate and initialise sctp mibs. */ | |
1118 | status = init_sctp_mibs(); | |
1119 | if (status) | |
1120 | goto err_init_mibs; | |
1121 | ||
1122 | /* Initialize proc fs directory. */ | |
1123 | status = sctp_proc_init(); | |
1124 | if (status) | |
1125 | goto err_init_proc; | |
1126 | ||
1127 | /* Initialize object count debugging. */ | |
1128 | sctp_dbg_objcnt_init(); | |
1129 | ||
1da177e4 LT |
1130 | /* |
1131 | * 14. Suggested SCTP Protocol Parameter Values | |
1132 | */ | |
1133 | /* The following protocol parameters are RECOMMENDED: */ | |
1134 | /* RTO.Initial - 3 seconds */ | |
1135 | sctp_rto_initial = SCTP_RTO_INITIAL; | |
1136 | /* RTO.Min - 1 second */ | |
1137 | sctp_rto_min = SCTP_RTO_MIN; | |
1138 | /* RTO.Max - 60 seconds */ | |
1139 | sctp_rto_max = SCTP_RTO_MAX; | |
1140 | /* RTO.Alpha - 1/8 */ | |
1141 | sctp_rto_alpha = SCTP_RTO_ALPHA; | |
1142 | /* RTO.Beta - 1/4 */ | |
1143 | sctp_rto_beta = SCTP_RTO_BETA; | |
1144 | ||
1145 | /* Valid.Cookie.Life - 60 seconds */ | |
3fd091e7 | 1146 | sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
1da177e4 LT |
1147 | |
1148 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1149 | sctp_cookie_preserve_enable = 1; | |
1150 | ||
1151 | /* Max.Burst - 4 */ | |
70331571 | 1152 | sctp_max_burst = SCTP_DEFAULT_MAX_BURST; |
1da177e4 LT |
1153 | |
1154 | /* Association.Max.Retrans - 10 attempts | |
1155 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1156 | * Max.Init.Retransmits - 8 attempts | |
1157 | */ | |
1158 | sctp_max_retrans_association = 10; | |
1159 | sctp_max_retrans_path = 5; | |
1160 | sctp_max_retrans_init = 8; | |
1161 | ||
4eb701df NH |
1162 | /* Sendbuffer growth - do per-socket accounting */ |
1163 | sctp_sndbuf_policy = 0; | |
1164 | ||
049b3ff5 NH |
1165 | /* Rcvbuffer growth - do per-socket accounting */ |
1166 | sctp_rcvbuf_policy = 0; | |
1167 | ||
1da177e4 | 1168 | /* HB.interval - 30 seconds */ |
2f85a429 VY |
1169 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
1170 | ||
1171 | /* delayed SACK timeout */ | |
1172 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1da177e4 LT |
1173 | |
1174 | /* Implementation specific variables. */ | |
1175 | ||
1176 | /* Initialize default stream count setup information. */ | |
1177 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1178 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1179 | ||
1180 | /* Initialize handle used for association ids. */ | |
1181 | idr_init(&sctp_assocs_id); | |
1182 | ||
4d93df0a NH |
1183 | /* Set the pressure threshold to be a fraction of global memory that |
1184 | * is up to 1/2 at 256 MB, decreasing toward zero with the amount of | |
1185 | * memory, with a floor of 128 pages. | |
1186 | * Note this initalizes the data in sctpv6_prot too | |
1187 | * Unabashedly stolen from tcp_init | |
1188 | */ | |
845525a6 VY |
1189 | nr_pages = totalram_pages - totalhigh_pages; |
1190 | limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); | |
1191 | limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); | |
4d93df0a NH |
1192 | limit = max(limit, 128UL); |
1193 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1194 | sysctl_sctp_mem[1] = limit; | |
1195 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1196 | ||
1197 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1198 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1199 | max_share = min(4UL*1024*1024, limit); | |
1200 | ||
845525a6 | 1201 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
4d93df0a NH |
1202 | sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); |
1203 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); | |
1204 | ||
3ab224be | 1205 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1206 | sysctl_sctp_wmem[1] = 16*1024; |
1207 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1208 | ||
1da177e4 LT |
1209 | /* Size and allocate the association hash table. |
1210 | * The methodology is similar to that of the tcp hash tables. | |
1211 | */ | |
1212 | if (num_physpages >= (128 * 1024)) | |
1213 | goal = num_physpages >> (22 - PAGE_SHIFT); | |
1214 | else | |
1215 | goal = num_physpages >> (24 - PAGE_SHIFT); | |
1216 | ||
1217 | for (order = 0; (1UL << order) < goal; order++) | |
1218 | ; | |
1219 | ||
1220 | do { | |
1221 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1222 | sizeof(struct sctp_hashbucket); | |
1223 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1224 | continue; | |
1225 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
1226 | __get_free_pages(GFP_ATOMIC, order); | |
1227 | } while (!sctp_assoc_hashtable && --order > 0); | |
1228 | if (!sctp_assoc_hashtable) { | |
1229 | printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); | |
1230 | status = -ENOMEM; | |
1231 | goto err_ahash_alloc; | |
1232 | } | |
1233 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1234 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1235 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | /* Allocate and initialize the endpoint hash table. */ | |
1239 | sctp_ep_hashsize = 64; | |
1240 | sctp_ep_hashtable = (struct sctp_hashbucket *) | |
1241 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); | |
1242 | if (!sctp_ep_hashtable) { | |
1243 | printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); | |
1244 | status = -ENOMEM; | |
1245 | goto err_ehash_alloc; | |
1246 | } | |
1247 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1248 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1249 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1250 | } |
1251 | ||
1252 | /* Allocate and initialize the SCTP port hash table. */ | |
1253 | do { | |
1254 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1255 | sizeof(struct sctp_bind_hashbucket); | |
1256 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1257 | continue; | |
1258 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
1259 | __get_free_pages(GFP_ATOMIC, order); | |
1260 | } while (!sctp_port_hashtable && --order > 0); | |
1261 | if (!sctp_port_hashtable) { | |
1262 | printk(KERN_ERR "SCTP: Failed bind hash alloc."); | |
1263 | status = -ENOMEM; | |
1264 | goto err_bhash_alloc; | |
1265 | } | |
1266 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1267 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1268 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1269 | } |
1270 | ||
1da177e4 LT |
1271 | printk(KERN_INFO "SCTP: Hash tables configured " |
1272 | "(established %d bind %d)\n", | |
1273 | sctp_assoc_hashsize, sctp_port_hashsize); | |
1274 | ||
1275 | /* Disable ADDIP by default. */ | |
1276 | sctp_addip_enable = 0; | |
73d9c4fd | 1277 | sctp_addip_noauth = 0; |
1da177e4 LT |
1278 | |
1279 | /* Enable PR-SCTP by default. */ | |
1280 | sctp_prsctp_enable = 1; | |
1281 | ||
a29a5bd4 VY |
1282 | /* Disable AUTH by default. */ |
1283 | sctp_auth_enable = 0; | |
1284 | ||
1da177e4 LT |
1285 | sctp_sysctl_register(); |
1286 | ||
1287 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1288 | sctp_v4_pf_init(); |
1289 | sctp_v6_pf_init(); | |
1da177e4 | 1290 | |
270637ab VY |
1291 | /* Initialize the local address list. */ |
1292 | INIT_LIST_HEAD(&sctp_local_addr_list); | |
1293 | spin_lock_init(&sctp_local_addr_lock); | |
1294 | sctp_get_local_addr_list(); | |
827bf122 | 1295 | |
270637ab | 1296 | status = sctp_v4_protosw_init(); |
827bf122 | 1297 | |
1da177e4 | 1298 | if (status) |
270637ab VY |
1299 | goto err_protosw_init; |
1300 | ||
1301 | status = sctp_v6_protosw_init(); | |
1302 | if (status) | |
1303 | goto err_v6_protosw_init; | |
1da177e4 LT |
1304 | |
1305 | /* Initialize the control inode/socket for handling OOTB packets. */ | |
1306 | if ((status = sctp_ctl_sock_init())) { | |
1307 | printk (KERN_ERR | |
1308 | "SCTP: Failed to initialize the SCTP control sock.\n"); | |
1309 | goto err_ctl_sock_init; | |
1310 | } | |
1311 | ||
270637ab VY |
1312 | status = sctp_v4_add_protocol(); |
1313 | if (status) | |
827bf122 | 1314 | goto err_add_protocol; |
827bf122 SS |
1315 | |
1316 | /* Register SCTP with inet6 layer. */ | |
1317 | status = sctp_v6_add_protocol(); | |
1318 | if (status) | |
1319 | goto err_v6_add_protocol; | |
1320 | ||
1da177e4 LT |
1321 | status = 0; |
1322 | out: | |
1323 | return status; | |
827bf122 | 1324 | err_v6_add_protocol: |
270637ab | 1325 | sctp_v6_del_protocol(); |
827bf122 | 1326 | err_add_protocol: |
270637ab | 1327 | sctp_v4_del_protocol(); |
5677242f | 1328 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1329 | err_ctl_sock_init: |
270637ab VY |
1330 | sctp_v6_protosw_exit(); |
1331 | err_v6_protosw_init: | |
1332 | sctp_v4_protosw_exit(); | |
1333 | err_protosw_init: | |
1334 | sctp_free_local_addr_list(); | |
1335 | sctp_v4_pf_exit(); | |
1336 | sctp_v6_pf_exit(); | |
1da177e4 | 1337 | sctp_sysctl_unregister(); |
15efbe76 | 1338 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1339 | free_pages((unsigned long)sctp_port_hashtable, |
1340 | get_order(sctp_port_hashsize * | |
1341 | sizeof(struct sctp_bind_hashbucket))); | |
1342 | err_bhash_alloc: | |
1343 | kfree(sctp_ep_hashtable); | |
1344 | err_ehash_alloc: | |
1345 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1346 | get_order(sctp_assoc_hashsize * | |
1347 | sizeof(struct sctp_hashbucket))); | |
1348 | err_ahash_alloc: | |
1349 | sctp_dbg_objcnt_exit(); | |
1da177e4 | 1350 | sctp_proc_exit(); |
827bf122 | 1351 | err_init_proc: |
1da177e4 LT |
1352 | cleanup_sctp_mibs(); |
1353 | err_init_mibs: | |
1354 | kmem_cache_destroy(sctp_chunk_cachep); | |
1355 | err_chunk_cachep: | |
1356 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1357 | goto out; |
1358 | } | |
1359 | ||
1360 | /* Exit handler for the SCTP protocol. */ | |
1361 | SCTP_STATIC __exit void sctp_exit(void) | |
1362 | { | |
1363 | /* BUG. This should probably do something useful like clean | |
1364 | * up all the remaining associations and all that memory. | |
1365 | */ | |
1366 | ||
827bf122 SS |
1367 | /* Unregister with inet6/inet layers. */ |
1368 | sctp_v6_del_protocol(); | |
270637ab | 1369 | sctp_v4_del_protocol(); |
1da177e4 LT |
1370 | |
1371 | /* Free the control endpoint. */ | |
5677242f | 1372 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1373 | |
270637ab VY |
1374 | /* Free protosw registrations */ |
1375 | sctp_v6_protosw_exit(); | |
1376 | sctp_v4_protosw_exit(); | |
1377 | ||
1378 | /* Free the local address list. */ | |
1379 | sctp_free_local_addr_list(); | |
827bf122 SS |
1380 | |
1381 | /* Unregister with socket layer. */ | |
270637ab VY |
1382 | sctp_v6_pf_exit(); |
1383 | sctp_v4_pf_exit(); | |
827bf122 | 1384 | |
1da177e4 | 1385 | sctp_sysctl_unregister(); |
15efbe76 | 1386 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1387 | |
1388 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1389 | get_order(sctp_assoc_hashsize * | |
1390 | sizeof(struct sctp_hashbucket))); | |
1391 | kfree(sctp_ep_hashtable); | |
1392 | free_pages((unsigned long)sctp_port_hashtable, | |
1393 | get_order(sctp_port_hashsize * | |
1394 | sizeof(struct sctp_bind_hashbucket))); | |
1395 | ||
1da177e4 LT |
1396 | sctp_dbg_objcnt_exit(); |
1397 | sctp_proc_exit(); | |
1398 | cleanup_sctp_mibs(); | |
1399 | ||
827bf122 SS |
1400 | kmem_cache_destroy(sctp_chunk_cachep); |
1401 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | module_init(sctp_init); | |
1405 | module_exit(sctp_exit); | |
1406 | ||
bb97d31f ACM |
1407 | /* |
1408 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1409 | */ | |
1410 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1411 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
1da177e4 LT |
1412 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
1413 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); | |
1414 | MODULE_LICENSE("GPL"); |