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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> |
457c4cbc | 55 | #include <net/net_namespace.h> |
1da177e4 LT |
56 | #include <net/protocol.h> |
57 | #include <net/ip.h> | |
58 | #include <net/ipv6.h> | |
14c85021 | 59 | #include <net/route.h> |
1da177e4 LT |
60 | #include <net/sctp/sctp.h> |
61 | #include <net/addrconf.h> | |
62 | #include <net/inet_common.h> | |
63 | #include <net/inet_ecn.h> | |
64 | ||
65 | /* Global data structures. */ | |
4cbf1cae | 66 | struct sctp_globals sctp_globals __read_mostly; |
1da177e4 | 67 | struct proc_dir_entry *proc_net_sctp; |
ba89966c | 68 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
1da177e4 LT |
69 | |
70 | struct idr sctp_assocs_id; | |
71 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
72 | ||
73 | /* This is the global socket data structure used for responding to | |
74 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
75 | * for this socket at the initialization time. | |
76 | */ | |
8258175c | 77 | static struct sock *sctp_ctl_sock; |
1da177e4 LT |
78 | |
79 | static struct sctp_pf *sctp_pf_inet6_specific; | |
80 | static struct sctp_pf *sctp_pf_inet_specific; | |
81 | static struct sctp_af *sctp_af_v4_specific; | |
82 | static struct sctp_af *sctp_af_v6_specific; | |
83 | ||
e18b890b CL |
84 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
85 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 86 | |
007e3936 VY |
87 | int sysctl_sctp_mem[3]; |
88 | int sysctl_sctp_rmem[3]; | |
89 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 90 | |
1da177e4 LT |
91 | /* Return the address of the control sock. */ |
92 | struct sock *sctp_get_ctl_sock(void) | |
93 | { | |
8258175c | 94 | return sctp_ctl_sock; |
1da177e4 LT |
95 | } |
96 | ||
97 | /* Set up the proc fs entry for the SCTP protocol. */ | |
98 | static __init int sctp_proc_init(void) | |
99 | { | |
100 | if (!proc_net_sctp) { | |
101 | struct proc_dir_entry *ent; | |
457c4cbc | 102 | ent = proc_mkdir("sctp", init_net.proc_net); |
1da177e4 LT |
103 | if (ent) { |
104 | ent->owner = THIS_MODULE; | |
105 | proc_net_sctp = ent; | |
106 | } else | |
107 | goto out_nomem; | |
108 | } | |
109 | ||
110 | if (sctp_snmp_proc_init()) | |
80896a35 | 111 | goto out_snmp_proc_init; |
1da177e4 | 112 | if (sctp_eps_proc_init()) |
80896a35 | 113 | goto out_eps_proc_init; |
1da177e4 | 114 | if (sctp_assocs_proc_init()) |
80896a35 | 115 | goto out_assocs_proc_init; |
20c2c1fd | 116 | if (sctp_remaddr_proc_init()) |
caea902f | 117 | goto out_remaddr_proc_init; |
1da177e4 LT |
118 | |
119 | return 0; | |
120 | ||
caea902f DM |
121 | out_remaddr_proc_init: |
122 | sctp_remaddr_proc_exit(); | |
80896a35 WY |
123 | out_assocs_proc_init: |
124 | sctp_eps_proc_exit(); | |
125 | out_eps_proc_init: | |
126 | sctp_snmp_proc_exit(); | |
127 | out_snmp_proc_init: | |
128 | if (proc_net_sctp) { | |
129 | proc_net_sctp = NULL; | |
130 | remove_proc_entry("sctp", init_net.proc_net); | |
131 | } | |
1da177e4 LT |
132 | out_nomem: |
133 | return -ENOMEM; | |
134 | } | |
135 | ||
d808ad9a | 136 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
137 | * Note: Do not make this __exit as it is used in the init error |
138 | * path. | |
139 | */ | |
140 | static void sctp_proc_exit(void) | |
141 | { | |
142 | sctp_snmp_proc_exit(); | |
143 | sctp_eps_proc_exit(); | |
144 | sctp_assocs_proc_exit(); | |
20c2c1fd | 145 | sctp_remaddr_proc_exit(); |
1da177e4 LT |
146 | |
147 | if (proc_net_sctp) { | |
148 | proc_net_sctp = NULL; | |
457c4cbc | 149 | remove_proc_entry("sctp", init_net.proc_net); |
1da177e4 LT |
150 | } |
151 | } | |
152 | ||
153 | /* Private helper to extract ipv4 address and stash them in | |
154 | * the protocol structure. | |
155 | */ | |
156 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
157 | struct net_device *dev) | |
158 | { | |
159 | struct in_device *in_dev; | |
160 | struct in_ifaddr *ifa; | |
161 | struct sctp_sockaddr_entry *addr; | |
162 | ||
163 | rcu_read_lock(); | |
e5ed6399 | 164 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
165 | rcu_read_unlock(); |
166 | return; | |
167 | } | |
168 | ||
169 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
170 | /* Add the address to the local list. */ | |
171 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
172 | if (addr) { | |
2a6fd78a AV |
173 | addr->a.v4.sin_family = AF_INET; |
174 | addr->a.v4.sin_port = 0; | |
175 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
176 | addr->valid = 1; |
177 | INIT_LIST_HEAD(&addr->list); | |
178 | INIT_RCU_HEAD(&addr->rcu); | |
1da177e4 LT |
179 | list_add_tail(&addr->list, addrlist); |
180 | } | |
181 | } | |
182 | ||
183 | rcu_read_unlock(); | |
184 | } | |
185 | ||
186 | /* Extract our IP addresses from the system and stash them in the | |
187 | * protocol structure. | |
188 | */ | |
29c7cf96 | 189 | static void sctp_get_local_addr_list(void) |
1da177e4 LT |
190 | { |
191 | struct net_device *dev; | |
192 | struct list_head *pos; | |
193 | struct sctp_af *af; | |
194 | ||
195 | read_lock(&dev_base_lock); | |
881d966b | 196 | for_each_netdev(&init_net, dev) { |
1da177e4 LT |
197 | __list_for_each(pos, &sctp_address_families) { |
198 | af = list_entry(pos, struct sctp_af, list); | |
199 | af->copy_addrlist(&sctp_local_addr_list, dev); | |
200 | } | |
201 | } | |
202 | read_unlock(&dev_base_lock); | |
203 | } | |
204 | ||
1da177e4 | 205 | /* Free the existing local addresses. */ |
29c7cf96 | 206 | static void sctp_free_local_addr_list(void) |
1da177e4 LT |
207 | { |
208 | struct sctp_sockaddr_entry *addr; | |
209 | struct list_head *pos, *temp; | |
210 | ||
211 | list_for_each_safe(pos, temp, &sctp_local_addr_list) { | |
212 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
213 | list_del(pos); | |
214 | kfree(addr); | |
215 | } | |
216 | } | |
217 | ||
29303547 VY |
218 | void sctp_local_addr_free(struct rcu_head *head) |
219 | { | |
220 | struct sctp_sockaddr_entry *e = container_of(head, | |
221 | struct sctp_sockaddr_entry, rcu); | |
222 | kfree(e); | |
223 | } | |
224 | ||
1da177e4 LT |
225 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
226 | int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, | |
dd0fc66f | 227 | gfp_t gfp, int copy_flags) |
1da177e4 LT |
228 | { |
229 | struct sctp_sockaddr_entry *addr; | |
230 | int error = 0; | |
1da177e4 | 231 | |
29303547 VY |
232 | rcu_read_lock(); |
233 | list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { | |
234 | if (!addr->valid) | |
235 | continue; | |
6244be4e | 236 | if (sctp_in_scope(&addr->a, scope)) { |
1da177e4 LT |
237 | /* Now that the address is in scope, check to see if |
238 | * the address type is really supported by the local | |
239 | * sock as well as the remote peer. | |
240 | */ | |
6244be4e | 241 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 242 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 243 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
244 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
245 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
246 | error = sctp_add_bind_addr(bp, &addr->a, |
247 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
248 | if (error) |
249 | goto end_copy; | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
254 | end_copy: | |
29303547 | 255 | rcu_read_unlock(); |
1da177e4 LT |
256 | return error; |
257 | } | |
258 | ||
259 | /* Initialize a sctp_addr from in incoming skb. */ | |
260 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
261 | int is_saddr) | |
262 | { | |
263 | void *from; | |
d55c41b1 | 264 | __be16 *port; |
1da177e4 LT |
265 | struct sctphdr *sh; |
266 | ||
267 | port = &addr->v4.sin_port; | |
268 | addr->v4.sin_family = AF_INET; | |
269 | ||
2c0fd387 | 270 | sh = sctp_hdr(skb); |
1da177e4 | 271 | if (is_saddr) { |
d55c41b1 | 272 | *port = sh->source; |
eddc9ec5 | 273 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 274 | } else { |
d55c41b1 | 275 | *port = sh->dest; |
eddc9ec5 | 276 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
277 | } |
278 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
279 | } | |
280 | ||
281 | /* Initialize an sctp_addr from a socket. */ | |
282 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
283 | { | |
284 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 285 | addr->v4.sin_port = 0; |
1da177e4 LT |
286 | addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; |
287 | } | |
288 | ||
289 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
290 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
291 | { | |
292 | inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; | |
293 | } | |
294 | ||
295 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
296 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
297 | { | |
298 | inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; | |
299 | } | |
300 | ||
301 | /* Initialize a sctp_addr from an address parameter. */ | |
302 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
303 | union sctp_addr_param *param, | |
dd86d136 | 304 | __be16 port, int iif) |
1da177e4 LT |
305 | { |
306 | addr->v4.sin_family = AF_INET; | |
307 | addr->v4.sin_port = port; | |
308 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
309 | } | |
310 | ||
311 | /* Initialize an address parameter from a sctp_addr and return the length | |
312 | * of the address parameter. | |
313 | */ | |
314 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
315 | union sctp_addr_param *param) | |
316 | { | |
317 | int length = sizeof(sctp_ipv4addr_param_t); | |
318 | ||
319 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 320 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 321 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
322 | |
323 | return length; | |
324 | } | |
325 | ||
326 | /* Initialize a sctp_addr from a dst_entry. */ | |
327 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, | |
854d43a4 | 328 | __be16 port) |
1da177e4 LT |
329 | { |
330 | struct rtable *rt = (struct rtable *)dst; | |
331 | saddr->v4.sin_family = AF_INET; | |
332 | saddr->v4.sin_port = port; | |
333 | saddr->v4.sin_addr.s_addr = rt->rt_src; | |
334 | } | |
335 | ||
336 | /* Compare two addresses exactly. */ | |
337 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
338 | const union sctp_addr *addr2) | |
339 | { | |
340 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
341 | return 0; | |
342 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
343 | return 0; | |
344 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
345 | return 0; | |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
350 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 351 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
352 | { |
353 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 354 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
355 | addr->v4.sin_port = port; |
356 | } | |
357 | ||
358 | /* Is this a wildcard address? */ | |
359 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
360 | { | |
e6f1cebf | 361 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
362 | } |
363 | ||
364 | /* This function checks if the address is a valid address to be used for | |
365 | * SCTP binding. | |
366 | * | |
367 | * Output: | |
368 | * Return 0 - If the address is a non-unicast or an illegal address. | |
369 | * Return 1 - If the address is a unicast. | |
370 | */ | |
5636bef7 VY |
371 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
372 | struct sctp_sock *sp, | |
373 | const struct sk_buff *skb) | |
1da177e4 LT |
374 | { |
375 | /* Is this a non-unicast address or a unusable SCTP address? */ | |
b5cb2bbc | 376 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
377 | return 0; |
378 | ||
d808ad9a | 379 | /* Is this a broadcast address? */ |
ee6b9673 | 380 | if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) |
d808ad9a | 381 | return 0; |
5636bef7 | 382 | |
1da177e4 LT |
383 | return 1; |
384 | } | |
385 | ||
386 | /* Should this be available for binding? */ | |
387 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
388 | { | |
6b175b26 | 389 | int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); |
1da177e4 | 390 | |
1da177e4 | 391 | |
e6f1cebf | 392 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
393 | ret != RTN_LOCAL && |
394 | !sp->inet.freebind && | |
395 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 396 | return 0; |
cdac4e07 | 397 | |
1da177e4 LT |
398 | return 1; |
399 | } | |
400 | ||
401 | /* Checking the loopback, private and other address scopes as defined in | |
402 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
403 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
404 | * | |
405 | * Level 0 - unusable SCTP addresses | |
406 | * Level 1 - loopback address | |
407 | * Level 2 - link-local addresses | |
408 | * Level 3 - private addresses. | |
409 | * Level 4 - global addresses | |
410 | * For INIT and INIT-ACK address list, let L be the level of | |
411 | * of requested destination address, sender and receiver | |
412 | * SHOULD include all of its addresses with level greater | |
413 | * than or equal to L. | |
414 | */ | |
415 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
416 | { | |
417 | sctp_scope_t retval; | |
418 | ||
419 | /* Should IPv4 scoping be a sysctl configurable option | |
420 | * so users can turn it off (default on) for certain | |
421 | * unconventional networking environments? | |
422 | */ | |
423 | ||
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 | */ | |
446 | static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, | |
447 | union sctp_addr *daddr, | |
448 | union sctp_addr *saddr) | |
449 | { | |
450 | struct rtable *rt; | |
451 | struct flowi fl; | |
452 | struct sctp_bind_addr *bp; | |
1da177e4 | 453 | struct sctp_sockaddr_entry *laddr; |
1da177e4 LT |
454 | struct dst_entry *dst = NULL; |
455 | union sctp_addr dst_saddr; | |
456 | ||
457 | memset(&fl, 0x0, sizeof(struct flowi)); | |
458 | fl.fl4_dst = daddr->v4.sin_addr.s_addr; | |
459 | fl.proto = IPPROTO_SCTP; | |
460 | if (asoc) { | |
461 | fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); | |
462 | fl.oif = asoc->base.sk->sk_bound_dev_if; | |
463 | } | |
464 | if (saddr) | |
465 | fl.fl4_src = saddr->v4.sin_addr.s_addr; | |
466 | ||
467 | SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ", | |
0dc47877 | 468 | __func__, NIPQUAD(fl.fl4_dst), |
1da177e4 LT |
469 | NIPQUAD(fl.fl4_src)); |
470 | ||
f206351a | 471 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
472 | dst = &rt->u.dst; |
473 | } | |
474 | ||
475 | /* If there is no association or if a source address is passed, no | |
476 | * more validation is required. | |
477 | */ | |
478 | if (!asoc || saddr) | |
479 | goto out; | |
480 | ||
481 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
482 | |
483 | if (dst) { | |
484 | /* Walk through the bind address list and look for a bind | |
485 | * address that matches the source address of the returned dst. | |
486 | */ | |
159c6bea | 487 | sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); |
559cf710 VY |
488 | rcu_read_lock(); |
489 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
f57d96b2 | 490 | if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) |
dc022a98 | 491 | continue; |
854d43a4 | 492 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
493 | goto out_unlock; |
494 | } | |
559cf710 | 495 | rcu_read_unlock(); |
1da177e4 LT |
496 | |
497 | /* None of the bound addresses match the source address of the | |
498 | * dst. So release it. | |
499 | */ | |
500 | dst_release(dst); | |
501 | dst = NULL; | |
502 | } | |
503 | ||
504 | /* Walk through the bind address list and try to get a dst that | |
505 | * matches a bind address as the source address. | |
506 | */ | |
559cf710 VY |
507 | rcu_read_lock(); |
508 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
509 | if (!laddr->valid) | |
510 | continue; | |
f57d96b2 | 511 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e AV |
512 | (AF_INET == laddr->a.sa.sa_family)) { |
513 | fl.fl4_src = laddr->a.v4.sin_addr.s_addr; | |
f206351a | 514 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
515 | dst = &rt->u.dst; |
516 | goto out_unlock; | |
517 | } | |
518 | } | |
519 | } | |
520 | ||
521 | out_unlock: | |
559cf710 | 522 | rcu_read_unlock(); |
1da177e4 LT |
523 | out: |
524 | if (dst) | |
525 | SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n", | |
d808ad9a | 526 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src)); |
1da177e4 LT |
527 | else |
528 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
529 | ||
530 | return dst; | |
531 | } | |
532 | ||
533 | /* For v4, the source address is cached in the route entry(dst). So no need | |
534 | * to cache it separately and hence this is an empty routine. | |
535 | */ | |
e5117101 YH |
536 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
537 | struct sctp_association *asoc, | |
1da177e4 LT |
538 | struct dst_entry *dst, |
539 | union sctp_addr *daddr, | |
540 | union sctp_addr *saddr) | |
541 | { | |
542 | struct rtable *rt = (struct rtable *)dst; | |
543 | ||
23ec47a0 VY |
544 | if (!asoc) |
545 | return; | |
546 | ||
1da177e4 LT |
547 | if (rt) { |
548 | saddr->v4.sin_family = AF_INET; | |
d3f7a54a | 549 | saddr->v4.sin_port = htons(asoc->base.bind_addr.port); |
d808ad9a | 550 | saddr->v4.sin_addr.s_addr = rt->rt_src; |
1da177e4 LT |
551 | } |
552 | } | |
553 | ||
554 | /* What interface did this skb arrive on? */ | |
555 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
556 | { | |
ee6b9673 | 557 | return skb->rtable->rt_iif; |
1da177e4 LT |
558 | } |
559 | ||
560 | /* Was this packet marked by Explicit Congestion Notification? */ | |
561 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
562 | { | |
eddc9ec5 | 563 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
564 | } |
565 | ||
566 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
567 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
568 | struct sctp_association *asoc) | |
569 | { | |
570 | struct inet_sock *inet = inet_sk(sk); | |
571 | struct inet_sock *newinet; | |
3b1e0a65 | 572 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 573 | sk->sk_prot); |
1da177e4 LT |
574 | |
575 | if (!newsk) | |
576 | goto out; | |
577 | ||
578 | sock_init_data(NULL, newsk); | |
579 | ||
580 | newsk->sk_type = SOCK_STREAM; | |
581 | ||
582 | newsk->sk_no_check = sk->sk_no_check; | |
583 | newsk->sk_reuse = sk->sk_reuse; | |
584 | newsk->sk_shutdown = sk->sk_shutdown; | |
585 | ||
586 | newsk->sk_destruct = inet_sock_destruct; | |
587 | newsk->sk_family = PF_INET; | |
588 | newsk->sk_protocol = IPPROTO_SCTP; | |
589 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
590 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
591 | ||
592 | newinet = inet_sk(newsk); | |
593 | ||
594 | /* Initialize sk's sport, dport, rcv_saddr and daddr for | |
595 | * getsockname() and getpeername() | |
596 | */ | |
597 | newinet->sport = inet->sport; | |
598 | newinet->saddr = inet->saddr; | |
599 | newinet->rcv_saddr = inet->rcv_saddr; | |
600 | newinet->dport = htons(asoc->peer.port); | |
601 | newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; | |
602 | newinet->pmtudisc = inet->pmtudisc; | |
d808ad9a | 603 | newinet->id = asoc->next_tsn ^ jiffies; |
1da177e4 LT |
604 | |
605 | newinet->uc_ttl = -1; | |
606 | newinet->mc_loop = 1; | |
607 | newinet->mc_ttl = 1; | |
608 | newinet->mc_index = 0; | |
609 | newinet->mc_list = NULL; | |
610 | ||
e6848976 | 611 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
612 | |
613 | if (newsk->sk_prot->init(newsk)) { | |
614 | sk_common_release(newsk); | |
615 | newsk = NULL; | |
616 | } | |
617 | ||
618 | out: | |
619 | return newsk; | |
620 | } | |
621 | ||
622 | /* Map address, empty for v4 family */ | |
623 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
624 | { | |
625 | /* Empty */ | |
626 | } | |
627 | ||
628 | /* Dump the v4 addr to the seq file. */ | |
629 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
630 | { | |
631 | seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); | |
632 | } | |
633 | ||
b9031d9d VY |
634 | static void sctp_v4_ecn_capable(struct sock *sk) |
635 | { | |
636 | INET_ECN_xmit(sk); | |
637 | } | |
638 | ||
29303547 VY |
639 | /* Event handler for inet address addition/deletion events. |
640 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
641 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
642 | * time and thus corrupt the list. | |
643 | * The reader side is protected with RCU. | |
644 | */ | |
24123186 AB |
645 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
646 | void *ptr) | |
1da177e4 | 647 | { |
29c7cf96 | 648 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
649 | struct sctp_sockaddr_entry *addr = NULL; |
650 | struct sctp_sockaddr_entry *temp; | |
22626216 | 651 | int found = 0; |
1da177e4 | 652 | |
c346dca1 | 653 | if (dev_net(ifa->ifa_dev->dev) != &init_net) |
6133fb1a DL |
654 | return NOTIFY_DONE; |
655 | ||
29c7cf96 SS |
656 | switch (ev) { |
657 | case NETDEV_UP: | |
658 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
659 | if (addr) { | |
660 | addr->a.v4.sin_family = AF_INET; | |
661 | addr->a.v4.sin_port = 0; | |
662 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
663 | addr->valid = 1; |
664 | spin_lock_bh(&sctp_local_addr_lock); | |
665 | list_add_tail_rcu(&addr->list, &sctp_local_addr_list); | |
666 | spin_unlock_bh(&sctp_local_addr_lock); | |
29c7cf96 SS |
667 | } |
668 | break; | |
669 | case NETDEV_DOWN: | |
29303547 VY |
670 | spin_lock_bh(&sctp_local_addr_lock); |
671 | list_for_each_entry_safe(addr, temp, | |
672 | &sctp_local_addr_list, list) { | |
a40a7d15 PE |
673 | if (addr->a.sa.sa_family == AF_INET && |
674 | addr->a.v4.sin_addr.s_addr == | |
675 | ifa->ifa_local) { | |
22626216 | 676 | found = 1; |
29303547 VY |
677 | addr->valid = 0; |
678 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
679 | break; |
680 | } | |
681 | } | |
29303547 | 682 | spin_unlock_bh(&sctp_local_addr_lock); |
22626216 | 683 | if (found) |
29303547 | 684 | call_rcu(&addr->rcu, sctp_local_addr_free); |
29c7cf96 SS |
685 | break; |
686 | } | |
1da177e4 LT |
687 | |
688 | return NOTIFY_DONE; | |
689 | } | |
690 | ||
691 | /* | |
692 | * Initialize the control inode/socket with a control endpoint data | |
693 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
694 | */ | |
695 | static int sctp_ctl_sock_init(void) | |
696 | { | |
697 | int err; | |
698 | sa_family_t family; | |
699 | ||
700 | if (sctp_get_pf_specific(PF_INET6)) | |
701 | family = PF_INET6; | |
702 | else | |
703 | family = PF_INET; | |
704 | ||
eee4fe4d | 705 | err = inet_ctl_sock_create(&sctp_ctl_sock, family, |
5677242f | 706 | SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); |
1da177e4 LT |
707 | if (err < 0) { |
708 | printk(KERN_ERR | |
709 | "SCTP: Failed to create the SCTP control socket.\n"); | |
710 | return err; | |
711 | } | |
1da177e4 LT |
712 | return 0; |
713 | } | |
714 | ||
715 | /* Register address family specific functions. */ | |
716 | int sctp_register_af(struct sctp_af *af) | |
717 | { | |
718 | switch (af->sa_family) { | |
719 | case AF_INET: | |
720 | if (sctp_af_v4_specific) | |
721 | return 0; | |
722 | sctp_af_v4_specific = af; | |
723 | break; | |
724 | case AF_INET6: | |
725 | if (sctp_af_v6_specific) | |
726 | return 0; | |
727 | sctp_af_v6_specific = af; | |
728 | break; | |
729 | default: | |
730 | return 0; | |
731 | } | |
732 | ||
733 | INIT_LIST_HEAD(&af->list); | |
734 | list_add_tail(&af->list, &sctp_address_families); | |
735 | return 1; | |
736 | } | |
737 | ||
738 | /* Get the table of functions for manipulating a particular address | |
739 | * family. | |
740 | */ | |
741 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
742 | { | |
743 | switch (family) { | |
744 | case AF_INET: | |
745 | return sctp_af_v4_specific; | |
746 | case AF_INET6: | |
747 | return sctp_af_v6_specific; | |
748 | default: | |
749 | return NULL; | |
750 | } | |
751 | } | |
752 | ||
753 | /* Common code to initialize a AF_INET msg_name. */ | |
754 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
755 | { | |
756 | struct sockaddr_in *sin; | |
757 | ||
758 | sin = (struct sockaddr_in *)msgname; | |
759 | *addr_len = sizeof(struct sockaddr_in); | |
760 | sin->sin_family = AF_INET; | |
761 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
762 | } | |
763 | ||
764 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
765 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
766 | int *addr_len) | |
767 | { | |
768 | struct sockaddr_in *sin, *sinfrom; | |
769 | ||
770 | if (msgname) { | |
771 | struct sctp_association *asoc; | |
772 | ||
773 | asoc = event->asoc; | |
774 | sctp_inet_msgname(msgname, addr_len); | |
775 | sin = (struct sockaddr_in *)msgname; | |
776 | sinfrom = &asoc->peer.primary_addr.v4; | |
777 | sin->sin_port = htons(asoc->peer.port); | |
778 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
779 | } | |
780 | } | |
781 | ||
782 | /* Initialize and copy out a msgname from an inbound skb. */ | |
783 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
784 | { | |
1da177e4 | 785 | if (msgname) { |
2c0fd387 ACM |
786 | struct sctphdr *sh = sctp_hdr(skb); |
787 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
788 | ||
1da177e4 | 789 | sctp_inet_msgname(msgname, len); |
1da177e4 | 790 | sin->sin_port = sh->source; |
eddc9ec5 | 791 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
792 | } |
793 | } | |
794 | ||
795 | /* Do we support this AF? */ | |
796 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
797 | { | |
798 | /* PF_INET only supports AF_INET addresses. */ | |
799 | return (AF_INET == family); | |
800 | } | |
801 | ||
802 | /* Address matching with wildcards allowed. */ | |
803 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
804 | const union sctp_addr *addr2, | |
805 | struct sctp_sock *opt) | |
806 | { | |
807 | /* PF_INET only supports AF_INET addresses. */ | |
808 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
809 | return 0; | |
e6f1cebf AV |
810 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
811 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
812 | return 1; |
813 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
814 | return 1; | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | /* Verify that provided sockaddr looks bindable. Common verification has | |
820 | * already been taken care of. | |
821 | */ | |
822 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
823 | { | |
824 | return sctp_v4_available(addr, opt); | |
825 | } | |
826 | ||
827 | /* Verify that sockaddr looks sendable. Common verification has already | |
828 | * been taken care of. | |
829 | */ | |
830 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
831 | { | |
832 | return 1; | |
833 | } | |
834 | ||
835 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
836 | * chunks. Returns number of addresses supported. | |
837 | */ | |
838 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 839 | __be16 *types) |
1da177e4 LT |
840 | { |
841 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
842 | return 1; | |
843 | } | |
844 | ||
845 | /* Wrapper routine that calls the ip transmit routine. */ | |
846 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
847 | struct sctp_transport *transport, int ipfragok) | |
848 | { | |
849 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " | |
850 | "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", | |
0dc47877 | 851 | __func__, skb, skb->len, |
ee6b9673 ED |
852 | NIPQUAD(skb->rtable->rt_src), |
853 | NIPQUAD(skb->rtable->rt_dst)); | |
1da177e4 LT |
854 | |
855 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); | |
e89862f4 | 856 | return ip_queue_xmit(skb, ipfragok); |
1da177e4 LT |
857 | } |
858 | ||
15efbe76 | 859 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
860 | |
861 | static struct sctp_pf sctp_pf_inet = { | |
862 | .event_msgname = sctp_inet_event_msgname, | |
863 | .skb_msgname = sctp_inet_skb_msgname, | |
864 | .af_supported = sctp_inet_af_supported, | |
865 | .cmp_addr = sctp_inet_cmp_addr, | |
866 | .bind_verify = sctp_inet_bind_verify, | |
867 | .send_verify = sctp_inet_send_verify, | |
868 | .supported_addrs = sctp_inet_supported_addrs, | |
869 | .create_accept_sk = sctp_v4_create_accept_sk, | |
870 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 871 | .af = &sctp_af_inet |
1da177e4 LT |
872 | }; |
873 | ||
874 | /* Notifier for inetaddr addition/deletion events. */ | |
875 | static struct notifier_block sctp_inetaddr_notifier = { | |
876 | .notifier_call = sctp_inetaddr_event, | |
877 | }; | |
878 | ||
879 | /* Socket operations. */ | |
90ddc4f0 | 880 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
881 | .family = PF_INET, |
882 | .owner = THIS_MODULE, | |
883 | .release = inet_release, /* Needs to be wrapped... */ | |
884 | .bind = inet_bind, | |
885 | .connect = inet_dgram_connect, | |
886 | .socketpair = sock_no_socketpair, | |
887 | .accept = inet_accept, | |
888 | .getname = inet_getname, /* Semantics are different. */ | |
889 | .poll = sctp_poll, | |
890 | .ioctl = inet_ioctl, | |
891 | .listen = sctp_inet_listen, | |
892 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
893 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
894 | .getsockopt = sock_common_getsockopt, | |
895 | .sendmsg = inet_sendmsg, | |
896 | .recvmsg = sock_common_recvmsg, | |
897 | .mmap = sock_no_mmap, | |
898 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 899 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
900 | .compat_setsockopt = compat_sock_common_setsockopt, |
901 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 902 | #endif |
1da177e4 LT |
903 | }; |
904 | ||
905 | /* Registration with AF_INET family. */ | |
906 | static struct inet_protosw sctp_seqpacket_protosw = { | |
907 | .type = SOCK_SEQPACKET, | |
908 | .protocol = IPPROTO_SCTP, | |
909 | .prot = &sctp_prot, | |
910 | .ops = &inet_seqpacket_ops, | |
911 | .capability = -1, | |
912 | .no_check = 0, | |
913 | .flags = SCTP_PROTOSW_FLAG | |
914 | }; | |
915 | static struct inet_protosw sctp_stream_protosw = { | |
916 | .type = SOCK_STREAM, | |
917 | .protocol = IPPROTO_SCTP, | |
918 | .prot = &sctp_prot, | |
919 | .ops = &inet_seqpacket_ops, | |
920 | .capability = -1, | |
921 | .no_check = 0, | |
922 | .flags = SCTP_PROTOSW_FLAG | |
923 | }; | |
924 | ||
925 | /* Register with IP layer. */ | |
926 | static struct net_protocol sctp_protocol = { | |
927 | .handler = sctp_rcv, | |
928 | .err_handler = sctp_v4_err, | |
929 | .no_policy = 1, | |
930 | }; | |
931 | ||
932 | /* IPv4 address related functions. */ | |
15efbe76 | 933 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
934 | .sa_family = AF_INET, |
935 | .sctp_xmit = sctp_v4_xmit, | |
936 | .setsockopt = ip_setsockopt, | |
937 | .getsockopt = ip_getsockopt, | |
938 | .get_dst = sctp_v4_get_dst, | |
939 | .get_saddr = sctp_v4_get_saddr, | |
940 | .copy_addrlist = sctp_v4_copy_addrlist, | |
941 | .from_skb = sctp_v4_from_skb, | |
942 | .from_sk = sctp_v4_from_sk, | |
943 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
944 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
945 | .from_addr_param = sctp_v4_from_addr_param, | |
946 | .to_addr_param = sctp_v4_to_addr_param, | |
947 | .dst_saddr = sctp_v4_dst_saddr, | |
948 | .cmp_addr = sctp_v4_cmp_addr, | |
949 | .addr_valid = sctp_v4_addr_valid, | |
950 | .inaddr_any = sctp_v4_inaddr_any, | |
951 | .is_any = sctp_v4_is_any, | |
952 | .available = sctp_v4_available, | |
953 | .scope = sctp_v4_scope, | |
954 | .skb_iif = sctp_v4_skb_iif, | |
955 | .is_ce = sctp_v4_is_ce, | |
956 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 957 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
958 | .net_header_len = sizeof(struct iphdr), |
959 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 960 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
961 | .compat_setsockopt = compat_ip_setsockopt, |
962 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 963 | #endif |
1da177e4 LT |
964 | }; |
965 | ||
966 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { | |
967 | ||
968 | switch (family) { | |
969 | case PF_INET: | |
970 | return sctp_pf_inet_specific; | |
971 | case PF_INET6: | |
972 | return sctp_pf_inet6_specific; | |
973 | default: | |
974 | return NULL; | |
975 | } | |
976 | } | |
977 | ||
978 | /* Register the PF specific function table. */ | |
979 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
980 | { | |
981 | switch (family) { | |
982 | case PF_INET: | |
983 | if (sctp_pf_inet_specific) | |
984 | return 0; | |
985 | sctp_pf_inet_specific = pf; | |
986 | break; | |
987 | case PF_INET6: | |
988 | if (sctp_pf_inet6_specific) | |
989 | return 0; | |
990 | sctp_pf_inet6_specific = pf; | |
991 | break; | |
992 | default: | |
993 | return 0; | |
994 | } | |
995 | return 1; | |
996 | } | |
997 | ||
996b1dba YH |
998 | static inline int init_sctp_mibs(void) |
999 | { | |
1000 | return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); | |
1da177e4 LT |
1001 | } |
1002 | ||
996b1dba | 1003 | static inline void cleanup_sctp_mibs(void) |
1da177e4 | 1004 | { |
996b1dba | 1005 | snmp_mib_free((void**)sctp_statistics); |
1da177e4 LT |
1006 | } |
1007 | ||
270637ab VY |
1008 | static void sctp_v4_pf_init(void) |
1009 | { | |
1010 | /* Initialize the SCTP specific PF functions. */ | |
1011 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1012 | sctp_register_af(&sctp_af_inet); | |
1013 | } | |
1014 | ||
1015 | static void sctp_v4_pf_exit(void) | |
1016 | { | |
1017 | list_del(&sctp_af_inet.list); | |
1018 | } | |
1019 | ||
1020 | static int sctp_v4_protosw_init(void) | |
1021 | { | |
1022 | int rc; | |
1023 | ||
1024 | rc = proto_register(&sctp_prot, 1); | |
1025 | if (rc) | |
1026 | return rc; | |
1027 | ||
1028 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1029 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1030 | inet_register_protosw(&sctp_stream_protosw); | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static void sctp_v4_protosw_exit(void) | |
1036 | { | |
1037 | inet_unregister_protosw(&sctp_stream_protosw); | |
1038 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1039 | proto_unregister(&sctp_prot); | |
1040 | } | |
1041 | ||
1042 | static int sctp_v4_add_protocol(void) | |
1043 | { | |
1044 | /* Register notifier for inet address additions/deletions. */ | |
1045 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1046 | ||
1047 | /* Register SCTP with inet layer. */ | |
1048 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1049 | return -EAGAIN; | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static void sctp_v4_del_protocol(void) | |
1055 | { | |
1056 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1057 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1058 | } | |
1059 | ||
1da177e4 LT |
1060 | /* Initialize the universe into something sensible. */ |
1061 | SCTP_STATIC __init int sctp_init(void) | |
1062 | { | |
1063 | int i; | |
1064 | int status = -EINVAL; | |
1065 | unsigned long goal; | |
4d93df0a NH |
1066 | unsigned long limit; |
1067 | int max_share; | |
1da177e4 LT |
1068 | int order; |
1069 | ||
1070 | /* SCTP_DEBUG sanity check. */ | |
1071 | if (!sctp_sanity_check()) | |
1072 | goto out; | |
1073 | ||
827bf122 | 1074 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1075 | status = -ENOBUFS; |
1076 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1077 | sizeof(struct sctp_bind_bucket), | |
1078 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1079 | NULL); |
1da177e4 | 1080 | if (!sctp_bucket_cachep) |
827bf122 | 1081 | goto out; |
1da177e4 LT |
1082 | |
1083 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1084 | sizeof(struct sctp_chunk), | |
1085 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1086 | NULL); |
1da177e4 LT |
1087 | if (!sctp_chunk_cachep) |
1088 | goto err_chunk_cachep; | |
1089 | ||
1090 | /* Allocate and initialise sctp mibs. */ | |
1091 | status = init_sctp_mibs(); | |
1092 | if (status) | |
1093 | goto err_init_mibs; | |
1094 | ||
1095 | /* Initialize proc fs directory. */ | |
1096 | status = sctp_proc_init(); | |
1097 | if (status) | |
1098 | goto err_init_proc; | |
1099 | ||
1100 | /* Initialize object count debugging. */ | |
1101 | sctp_dbg_objcnt_init(); | |
1102 | ||
1da177e4 LT |
1103 | /* |
1104 | * 14. Suggested SCTP Protocol Parameter Values | |
1105 | */ | |
1106 | /* The following protocol parameters are RECOMMENDED: */ | |
1107 | /* RTO.Initial - 3 seconds */ | |
1108 | sctp_rto_initial = SCTP_RTO_INITIAL; | |
1109 | /* RTO.Min - 1 second */ | |
1110 | sctp_rto_min = SCTP_RTO_MIN; | |
1111 | /* RTO.Max - 60 seconds */ | |
1112 | sctp_rto_max = SCTP_RTO_MAX; | |
1113 | /* RTO.Alpha - 1/8 */ | |
1114 | sctp_rto_alpha = SCTP_RTO_ALPHA; | |
1115 | /* RTO.Beta - 1/4 */ | |
1116 | sctp_rto_beta = SCTP_RTO_BETA; | |
1117 | ||
1118 | /* Valid.Cookie.Life - 60 seconds */ | |
3fd091e7 | 1119 | sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
1da177e4 LT |
1120 | |
1121 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1122 | sctp_cookie_preserve_enable = 1; | |
1123 | ||
1124 | /* Max.Burst - 4 */ | |
70331571 | 1125 | sctp_max_burst = SCTP_DEFAULT_MAX_BURST; |
1da177e4 LT |
1126 | |
1127 | /* Association.Max.Retrans - 10 attempts | |
1128 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1129 | * Max.Init.Retransmits - 8 attempts | |
1130 | */ | |
1131 | sctp_max_retrans_association = 10; | |
1132 | sctp_max_retrans_path = 5; | |
1133 | sctp_max_retrans_init = 8; | |
1134 | ||
4eb701df NH |
1135 | /* Sendbuffer growth - do per-socket accounting */ |
1136 | sctp_sndbuf_policy = 0; | |
1137 | ||
049b3ff5 NH |
1138 | /* Rcvbuffer growth - do per-socket accounting */ |
1139 | sctp_rcvbuf_policy = 0; | |
1140 | ||
1da177e4 | 1141 | /* HB.interval - 30 seconds */ |
2f85a429 VY |
1142 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
1143 | ||
1144 | /* delayed SACK timeout */ | |
1145 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1da177e4 LT |
1146 | |
1147 | /* Implementation specific variables. */ | |
1148 | ||
1149 | /* Initialize default stream count setup information. */ | |
1150 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1151 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1152 | ||
1153 | /* Initialize handle used for association ids. */ | |
1154 | idr_init(&sctp_assocs_id); | |
1155 | ||
4d93df0a NH |
1156 | /* Set the pressure threshold to be a fraction of global memory that |
1157 | * is up to 1/2 at 256 MB, decreasing toward zero with the amount of | |
1158 | * memory, with a floor of 128 pages. | |
1159 | * Note this initalizes the data in sctpv6_prot too | |
1160 | * Unabashedly stolen from tcp_init | |
1161 | */ | |
1162 | limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); | |
1163 | limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); | |
1164 | limit = max(limit, 128UL); | |
1165 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1166 | sysctl_sctp_mem[1] = limit; | |
1167 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1168 | ||
1169 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1170 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1171 | max_share = min(4UL*1024*1024, limit); | |
1172 | ||
1173 | sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */ | |
1174 | sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); | |
1175 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); | |
1176 | ||
3ab224be | 1177 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1178 | sysctl_sctp_wmem[1] = 16*1024; |
1179 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1180 | ||
1da177e4 LT |
1181 | /* Size and allocate the association hash table. |
1182 | * The methodology is similar to that of the tcp hash tables. | |
1183 | */ | |
1184 | if (num_physpages >= (128 * 1024)) | |
1185 | goal = num_physpages >> (22 - PAGE_SHIFT); | |
1186 | else | |
1187 | goal = num_physpages >> (24 - PAGE_SHIFT); | |
1188 | ||
1189 | for (order = 0; (1UL << order) < goal; order++) | |
1190 | ; | |
1191 | ||
1192 | do { | |
1193 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1194 | sizeof(struct sctp_hashbucket); | |
1195 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1196 | continue; | |
1197 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
1198 | __get_free_pages(GFP_ATOMIC, order); | |
1199 | } while (!sctp_assoc_hashtable && --order > 0); | |
1200 | if (!sctp_assoc_hashtable) { | |
1201 | printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); | |
1202 | status = -ENOMEM; | |
1203 | goto err_ahash_alloc; | |
1204 | } | |
1205 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1206 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1207 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1208 | } |
1209 | ||
1210 | /* Allocate and initialize the endpoint hash table. */ | |
1211 | sctp_ep_hashsize = 64; | |
1212 | sctp_ep_hashtable = (struct sctp_hashbucket *) | |
1213 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); | |
1214 | if (!sctp_ep_hashtable) { | |
1215 | printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); | |
1216 | status = -ENOMEM; | |
1217 | goto err_ehash_alloc; | |
1218 | } | |
1219 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1220 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1221 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1222 | } |
1223 | ||
1224 | /* Allocate and initialize the SCTP port hash table. */ | |
1225 | do { | |
1226 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1227 | sizeof(struct sctp_bind_hashbucket); | |
1228 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1229 | continue; | |
1230 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
1231 | __get_free_pages(GFP_ATOMIC, order); | |
1232 | } while (!sctp_port_hashtable && --order > 0); | |
1233 | if (!sctp_port_hashtable) { | |
1234 | printk(KERN_ERR "SCTP: Failed bind hash alloc."); | |
1235 | status = -ENOMEM; | |
1236 | goto err_bhash_alloc; | |
1237 | } | |
1238 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1239 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1240 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1241 | } |
1242 | ||
1da177e4 LT |
1243 | printk(KERN_INFO "SCTP: Hash tables configured " |
1244 | "(established %d bind %d)\n", | |
1245 | sctp_assoc_hashsize, sctp_port_hashsize); | |
1246 | ||
1247 | /* Disable ADDIP by default. */ | |
1248 | sctp_addip_enable = 0; | |
73d9c4fd | 1249 | sctp_addip_noauth = 0; |
1da177e4 LT |
1250 | |
1251 | /* Enable PR-SCTP by default. */ | |
1252 | sctp_prsctp_enable = 1; | |
1253 | ||
a29a5bd4 VY |
1254 | /* Disable AUTH by default. */ |
1255 | sctp_auth_enable = 0; | |
1256 | ||
1da177e4 LT |
1257 | sctp_sysctl_register(); |
1258 | ||
1259 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1260 | sctp_v4_pf_init(); |
1261 | sctp_v6_pf_init(); | |
1da177e4 | 1262 | |
270637ab VY |
1263 | /* Initialize the local address list. */ |
1264 | INIT_LIST_HEAD(&sctp_local_addr_list); | |
1265 | spin_lock_init(&sctp_local_addr_lock); | |
1266 | sctp_get_local_addr_list(); | |
827bf122 | 1267 | |
270637ab | 1268 | status = sctp_v4_protosw_init(); |
827bf122 | 1269 | |
1da177e4 | 1270 | if (status) |
270637ab VY |
1271 | goto err_protosw_init; |
1272 | ||
1273 | status = sctp_v6_protosw_init(); | |
1274 | if (status) | |
1275 | goto err_v6_protosw_init; | |
1da177e4 LT |
1276 | |
1277 | /* Initialize the control inode/socket for handling OOTB packets. */ | |
1278 | if ((status = sctp_ctl_sock_init())) { | |
1279 | printk (KERN_ERR | |
1280 | "SCTP: Failed to initialize the SCTP control sock.\n"); | |
1281 | goto err_ctl_sock_init; | |
1282 | } | |
1283 | ||
270637ab VY |
1284 | status = sctp_v4_add_protocol(); |
1285 | if (status) | |
827bf122 | 1286 | goto err_add_protocol; |
827bf122 SS |
1287 | |
1288 | /* Register SCTP with inet6 layer. */ | |
1289 | status = sctp_v6_add_protocol(); | |
1290 | if (status) | |
1291 | goto err_v6_add_protocol; | |
1292 | ||
1da177e4 LT |
1293 | status = 0; |
1294 | out: | |
1295 | return status; | |
827bf122 | 1296 | err_v6_add_protocol: |
270637ab | 1297 | sctp_v6_del_protocol(); |
827bf122 | 1298 | err_add_protocol: |
270637ab | 1299 | sctp_v4_del_protocol(); |
5677242f | 1300 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1301 | err_ctl_sock_init: |
270637ab VY |
1302 | sctp_v6_protosw_exit(); |
1303 | err_v6_protosw_init: | |
1304 | sctp_v4_protosw_exit(); | |
1305 | err_protosw_init: | |
1306 | sctp_free_local_addr_list(); | |
1307 | sctp_v4_pf_exit(); | |
1308 | sctp_v6_pf_exit(); | |
1da177e4 | 1309 | sctp_sysctl_unregister(); |
15efbe76 | 1310 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1311 | free_pages((unsigned long)sctp_port_hashtable, |
1312 | get_order(sctp_port_hashsize * | |
1313 | sizeof(struct sctp_bind_hashbucket))); | |
1314 | err_bhash_alloc: | |
1315 | kfree(sctp_ep_hashtable); | |
1316 | err_ehash_alloc: | |
1317 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1318 | get_order(sctp_assoc_hashsize * | |
1319 | sizeof(struct sctp_hashbucket))); | |
1320 | err_ahash_alloc: | |
1321 | sctp_dbg_objcnt_exit(); | |
1da177e4 | 1322 | sctp_proc_exit(); |
827bf122 | 1323 | err_init_proc: |
1da177e4 LT |
1324 | cleanup_sctp_mibs(); |
1325 | err_init_mibs: | |
1326 | kmem_cache_destroy(sctp_chunk_cachep); | |
1327 | err_chunk_cachep: | |
1328 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1329 | goto out; |
1330 | } | |
1331 | ||
1332 | /* Exit handler for the SCTP protocol. */ | |
1333 | SCTP_STATIC __exit void sctp_exit(void) | |
1334 | { | |
1335 | /* BUG. This should probably do something useful like clean | |
1336 | * up all the remaining associations and all that memory. | |
1337 | */ | |
1338 | ||
827bf122 SS |
1339 | /* Unregister with inet6/inet layers. */ |
1340 | sctp_v6_del_protocol(); | |
270637ab | 1341 | sctp_v4_del_protocol(); |
1da177e4 LT |
1342 | |
1343 | /* Free the control endpoint. */ | |
5677242f | 1344 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1345 | |
270637ab VY |
1346 | /* Free protosw registrations */ |
1347 | sctp_v6_protosw_exit(); | |
1348 | sctp_v4_protosw_exit(); | |
1349 | ||
1350 | /* Free the local address list. */ | |
1351 | sctp_free_local_addr_list(); | |
827bf122 SS |
1352 | |
1353 | /* Unregister with socket layer. */ | |
270637ab VY |
1354 | sctp_v6_pf_exit(); |
1355 | sctp_v4_pf_exit(); | |
827bf122 | 1356 | |
1da177e4 | 1357 | sctp_sysctl_unregister(); |
15efbe76 | 1358 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1359 | |
1360 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1361 | get_order(sctp_assoc_hashsize * | |
1362 | sizeof(struct sctp_hashbucket))); | |
1363 | kfree(sctp_ep_hashtable); | |
1364 | free_pages((unsigned long)sctp_port_hashtable, | |
1365 | get_order(sctp_port_hashsize * | |
1366 | sizeof(struct sctp_bind_hashbucket))); | |
1367 | ||
1da177e4 LT |
1368 | sctp_dbg_objcnt_exit(); |
1369 | sctp_proc_exit(); | |
1370 | cleanup_sctp_mibs(); | |
1371 | ||
827bf122 SS |
1372 | kmem_cache_destroy(sctp_chunk_cachep); |
1373 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | module_init(sctp_init); | |
1377 | module_exit(sctp_exit); | |
1378 | ||
bb97d31f ACM |
1379 | /* |
1380 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1381 | */ | |
1382 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1383 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
1da177e4 LT |
1384 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
1385 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); | |
1386 | MODULE_LICENSE("GPL"); |