Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2003 |
3 | * Copyright (c) Cisco 1999,2000 | |
4 | * Copyright (c) Motorola 1999,2000,2001 | |
5 | * Copyright (c) La Monte H.P. Yarroll 2001 | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation. |
1da177e4 LT |
8 | * |
9 | * A collection class to handle the storage of transport addresses. | |
10 | * | |
60c778b2 | 11 | * This SCTP implementation is free software; |
1da177e4 LT |
12 | * you can redistribute it and/or modify it under the terms of |
13 | * the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
60c778b2 | 17 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
18 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
19 | * ************************ | |
20 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
21 | * See the GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with GNU CC; see the file COPYING. If not, write to | |
25 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
26 | * Boston, MA 02111-1307, USA. | |
27 | * | |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
30 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
31 | * | |
32 | * Or submit a bug report through the following website: | |
33 | * http://www.sf.net/projects/lksctp | |
34 | * | |
35 | * Written or modified by: | |
36 | * La Monte H.P. Yarroll <piggy@acm.org> | |
37 | * Karl Knutson <karl@athena.chicago.il.us> | |
38 | * Jon Grimm <jgrimm@us.ibm.com> | |
39 | * Daisy Chang <daisyc@us.ibm.com> | |
40 | * | |
41 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
42 | * be incorporated into the next SCTP release. | |
43 | */ | |
44 | ||
45 | #include <linux/types.h> | |
1da177e4 LT |
46 | #include <linux/in.h> |
47 | #include <net/sock.h> | |
48 | #include <net/ipv6.h> | |
49 | #include <net/if_inet6.h> | |
50 | #include <net/sctp/sctp.h> | |
51 | #include <net/sctp/sm.h> | |
52 | ||
53 | /* Forward declarations for internal helpers. */ | |
54 | static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *, | |
dd0fc66f | 55 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 56 | int flags); |
1da177e4 LT |
57 | static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
58 | ||
59 | /* First Level Abstractions. */ | |
60 | ||
61 | /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses | |
62 | * in 'src' which have a broader scope than 'scope'. | |
63 | */ | |
d808ad9a | 64 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, |
1da177e4 | 65 | const struct sctp_bind_addr *src, |
dd0fc66f | 66 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 67 | int flags) |
1da177e4 LT |
68 | { |
69 | struct sctp_sockaddr_entry *addr; | |
1da177e4 LT |
70 | int error = 0; |
71 | ||
72 | /* All addresses share the same port. */ | |
73 | dest->port = src->port; | |
74 | ||
75 | /* Extract the addresses which are relevant for this scope. */ | |
9dbc15f0 | 76 | list_for_each_entry(addr, &src->address_list, list) { |
02a8a4db | 77 | error = sctp_copy_one_addr(dest, &addr->a, scope, |
1da177e4 LT |
78 | gfp, flags); |
79 | if (error < 0) | |
80 | goto out; | |
81 | } | |
82 | ||
83 | /* If there are no addresses matching the scope and | |
84 | * this is global scope, try to get a link scope address, with | |
85 | * the assumption that we must be sitting behind a NAT. | |
86 | */ | |
87 | if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { | |
9dbc15f0 | 88 | list_for_each_entry(addr, &src->address_list, list) { |
02a8a4db | 89 | error = sctp_copy_one_addr(dest, &addr->a, |
1da177e4 LT |
90 | SCTP_SCOPE_LINK, gfp, |
91 | flags); | |
92 | if (error < 0) | |
93 | goto out; | |
94 | } | |
95 | } | |
96 | ||
97 | out: | |
98 | if (error) | |
99 | sctp_bind_addr_clean(dest); | |
100 | ||
101 | return error; | |
102 | } | |
103 | ||
8e71a11c VY |
104 | /* Exactly duplicate the address lists. This is necessary when doing |
105 | * peer-offs and accepts. We don't want to put all the current system | |
106 | * addresses into the endpoint. That's useless. But we do want duplicat | |
107 | * the list of bound addresses that the older endpoint used. | |
108 | */ | |
109 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, | |
110 | const struct sctp_bind_addr *src, | |
111 | gfp_t gfp) | |
112 | { | |
113 | struct sctp_sockaddr_entry *addr; | |
8e71a11c VY |
114 | int error = 0; |
115 | ||
116 | /* All addresses share the same port. */ | |
117 | dest->port = src->port; | |
118 | ||
9dbc15f0 | 119 | list_for_each_entry(addr, &src->address_list, list) { |
8e71a11c VY |
120 | error = sctp_add_bind_addr(dest, &addr->a, 1, gfp); |
121 | if (error < 0) | |
122 | break; | |
123 | } | |
124 | ||
125 | return error; | |
126 | } | |
127 | ||
1da177e4 LT |
128 | /* Initialize the SCTP_bind_addr structure for either an endpoint or |
129 | * an association. | |
130 | */ | |
131 | void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) | |
132 | { | |
133 | bp->malloced = 0; | |
134 | ||
135 | INIT_LIST_HEAD(&bp->address_list); | |
136 | bp->port = port; | |
137 | } | |
138 | ||
139 | /* Dispose of the address list. */ | |
140 | static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) | |
141 | { | |
142 | struct sctp_sockaddr_entry *addr; | |
143 | struct list_head *pos, *temp; | |
144 | ||
145 | /* Empty the bind address list. */ | |
146 | list_for_each_safe(pos, temp, &bp->address_list) { | |
147 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
148 | list_del(pos); | |
149 | kfree(addr); | |
150 | SCTP_DBG_OBJCNT_DEC(addr); | |
151 | } | |
152 | } | |
153 | ||
154 | /* Dispose of an SCTP_bind_addr structure */ | |
155 | void sctp_bind_addr_free(struct sctp_bind_addr *bp) | |
156 | { | |
157 | /* Empty the bind address list. */ | |
158 | sctp_bind_addr_clean(bp); | |
159 | ||
160 | if (bp->malloced) { | |
161 | kfree(bp); | |
162 | SCTP_DBG_OBJCNT_DEC(bind_addr); | |
163 | } | |
164 | } | |
165 | ||
166 | /* Add an address to the bind address list in the SCTP_bind_addr structure. */ | |
167 | int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, | |
f57d96b2 | 168 | __u8 addr_state, gfp_t gfp) |
1da177e4 LT |
169 | { |
170 | struct sctp_sockaddr_entry *addr; | |
171 | ||
172 | /* Add the address to the bind address list. */ | |
173 | addr = t_new(struct sctp_sockaddr_entry, gfp); | |
174 | if (!addr) | |
175 | return -ENOMEM; | |
176 | ||
5ab7b859 | 177 | memcpy(&addr->a, new, sizeof(*new)); |
1da177e4 LT |
178 | |
179 | /* Fix up the port if it has not yet been set. | |
180 | * Both v4 and v6 have the port at the same offset. | |
181 | */ | |
5ab7b859 AV |
182 | if (!addr->a.v4.sin_port) |
183 | addr->a.v4.sin_port = htons(bp->port); | |
1da177e4 | 184 | |
f57d96b2 | 185 | addr->state = addr_state; |
29303547 | 186 | addr->valid = 1; |
dc022a98 | 187 | |
1da177e4 | 188 | INIT_LIST_HEAD(&addr->list); |
29303547 | 189 | INIT_RCU_HEAD(&addr->rcu); |
559cf710 VY |
190 | |
191 | /* We always hold a socket lock when calling this function, | |
192 | * and that acts as a writer synchronizing lock. | |
193 | */ | |
194 | list_add_tail_rcu(&addr->list, &bp->address_list); | |
1da177e4 LT |
195 | SCTP_DBG_OBJCNT_INC(addr); |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | /* Delete an address from the bind address list in the SCTP_bind_addr | |
201 | * structure. | |
202 | */ | |
0ed90fb0 | 203 | int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) |
1da177e4 | 204 | { |
559cf710 | 205 | struct sctp_sockaddr_entry *addr, *temp; |
22626216 | 206 | int found = 0; |
1da177e4 | 207 | |
559cf710 VY |
208 | /* We hold the socket lock when calling this function, |
209 | * and that acts as a writer synchronizing lock. | |
210 | */ | |
211 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { | |
c9a08505 | 212 | if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
1da177e4 | 213 | /* Found the exact match. */ |
22626216 | 214 | found = 1; |
559cf710 VY |
215 | addr->valid = 0; |
216 | list_del_rcu(&addr->list); | |
217 | break; | |
1da177e4 LT |
218 | } |
219 | } | |
220 | ||
22626216 | 221 | if (found) { |
0ed90fb0 | 222 | call_rcu(&addr->rcu, sctp_local_addr_free); |
559cf710 | 223 | SCTP_DBG_OBJCNT_DEC(addr); |
0ed90fb0 | 224 | return 0; |
559cf710 VY |
225 | } |
226 | ||
1da177e4 LT |
227 | return -EINVAL; |
228 | } | |
229 | ||
230 | /* Create a network byte-order representation of all the addresses | |
231 | * formated as SCTP parameters. | |
232 | * | |
233 | * The second argument is the return value for the length. | |
234 | */ | |
235 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 236 | int *addrs_len, |
dd0fc66f | 237 | gfp_t gfp) |
1da177e4 LT |
238 | { |
239 | union sctp_params addrparms; | |
240 | union sctp_params retval; | |
241 | int addrparms_len; | |
242 | union sctp_addr_param rawaddr; | |
243 | int len; | |
244 | struct sctp_sockaddr_entry *addr; | |
245 | struct list_head *pos; | |
246 | struct sctp_af *af; | |
247 | ||
248 | addrparms_len = 0; | |
249 | len = 0; | |
250 | ||
251 | /* Allocate enough memory at once. */ | |
252 | list_for_each(pos, &bp->address_list) { | |
253 | len += sizeof(union sctp_addr_param); | |
254 | } | |
255 | ||
256 | /* Don't even bother embedding an address if there | |
257 | * is only one. | |
258 | */ | |
259 | if (len == sizeof(union sctp_addr_param)) { | |
260 | retval.v = NULL; | |
261 | goto end_raw; | |
262 | } | |
263 | ||
264 | retval.v = kmalloc(len, gfp); | |
265 | if (!retval.v) | |
266 | goto end_raw; | |
267 | ||
268 | addrparms = retval; | |
269 | ||
9dbc15f0 | 270 | list_for_each_entry(addr, &bp->address_list, list) { |
6244be4e AV |
271 | af = sctp_get_af_specific(addr->a.v4.sin_family); |
272 | len = af->to_addr_param(&addr->a, &rawaddr); | |
1da177e4 LT |
273 | memcpy(addrparms.v, &rawaddr, len); |
274 | addrparms.v += len; | |
275 | addrparms_len += len; | |
276 | } | |
277 | ||
278 | end_raw: | |
279 | *addrs_len = addrparms_len; | |
280 | return retval; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Create an address list out of the raw address list format (IPv4 and IPv6 | |
285 | * address parameters). | |
286 | */ | |
287 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, | |
dd0fc66f | 288 | int addrs_len, __u16 port, gfp_t gfp) |
1da177e4 LT |
289 | { |
290 | union sctp_addr_param *rawaddr; | |
291 | struct sctp_paramhdr *param; | |
292 | union sctp_addr addr; | |
293 | int retval = 0; | |
294 | int len; | |
295 | struct sctp_af *af; | |
296 | ||
297 | /* Convert the raw address to standard address format */ | |
298 | while (addrs_len) { | |
299 | param = (struct sctp_paramhdr *)raw_addr_list; | |
300 | rawaddr = (union sctp_addr_param *)raw_addr_list; | |
301 | ||
302 | af = sctp_get_af_specific(param_type2af(param->type)); | |
303 | if (unlikely(!af)) { | |
304 | retval = -EINVAL; | |
305 | sctp_bind_addr_clean(bp); | |
306 | break; | |
307 | } | |
308 | ||
dd86d136 | 309 | af->from_addr_param(&addr, rawaddr, htons(port), 0); |
f57d96b2 | 310 | retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp); |
1da177e4 LT |
311 | if (retval) { |
312 | /* Can't finish building the list, clean up. */ | |
313 | sctp_bind_addr_clean(bp); | |
314 | break; | |
315 | } | |
316 | ||
317 | len = ntohs(param->length); | |
318 | addrs_len -= len; | |
319 | raw_addr_list += len; | |
320 | } | |
321 | ||
322 | return retval; | |
323 | } | |
324 | ||
325 | /******************************************************************** | |
326 | * 2nd Level Abstractions | |
327 | ********************************************************************/ | |
328 | ||
329 | /* Does this contain a specified address? Allow wildcarding. */ | |
d808ad9a | 330 | int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
1da177e4 LT |
331 | const union sctp_addr *addr, |
332 | struct sctp_sock *opt) | |
333 | { | |
334 | struct sctp_sockaddr_entry *laddr; | |
559cf710 VY |
335 | int match = 0; |
336 | ||
337 | rcu_read_lock(); | |
338 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
339 | if (!laddr->valid) | |
340 | continue; | |
341 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { | |
342 | match = 1; | |
343 | break; | |
344 | } | |
1da177e4 | 345 | } |
559cf710 | 346 | rcu_read_unlock(); |
1da177e4 | 347 | |
559cf710 | 348 | return match; |
1da177e4 LT |
349 | } |
350 | ||
7dab83de VY |
351 | /* Does the address 'addr' conflict with any addresses in |
352 | * the bp. | |
353 | */ | |
354 | int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, | |
355 | const union sctp_addr *addr, | |
356 | struct sctp_sock *bp_sp, | |
357 | struct sctp_sock *addr_sp) | |
358 | { | |
359 | struct sctp_sockaddr_entry *laddr; | |
360 | int conflict = 0; | |
361 | struct sctp_sock *sp; | |
362 | ||
363 | /* Pick the IPv6 socket as the basis of comparison | |
364 | * since it's usually a superset of the IPv4. | |
365 | * If there is no IPv6 socket, then default to bind_addr. | |
366 | */ | |
367 | if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) | |
368 | sp = bp_sp; | |
369 | else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) | |
370 | sp = addr_sp; | |
371 | else | |
372 | sp = bp_sp; | |
373 | ||
374 | rcu_read_lock(); | |
375 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
376 | if (!laddr->valid) | |
377 | continue; | |
378 | ||
379 | conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); | |
380 | if (conflict) | |
381 | break; | |
382 | } | |
383 | rcu_read_unlock(); | |
384 | ||
385 | return conflict; | |
386 | } | |
387 | ||
75205f47 VY |
388 | /* Get the state of the entry in the bind_addr_list */ |
389 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, | |
390 | const union sctp_addr *addr) | |
391 | { | |
392 | struct sctp_sockaddr_entry *laddr; | |
393 | struct sctp_af *af; | |
394 | int state = -1; | |
395 | ||
396 | af = sctp_get_af_specific(addr->sa.sa_family); | |
397 | if (unlikely(!af)) | |
398 | return state; | |
399 | ||
400 | rcu_read_lock(); | |
401 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
402 | if (!laddr->valid) | |
403 | continue; | |
404 | if (af->cmp_addr(&laddr->a, addr)) { | |
405 | state = laddr->state; | |
406 | break; | |
407 | } | |
408 | } | |
409 | rcu_read_unlock(); | |
410 | ||
411 | return state; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | /* Find the first address in the bind address list that is not present in |
415 | * the addrs packed array. | |
416 | */ | |
417 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
418 | const union sctp_addr *addrs, | |
419 | int addrcnt, | |
420 | struct sctp_sock *opt) | |
421 | { | |
422 | struct sctp_sockaddr_entry *laddr; | |
423 | union sctp_addr *addr; | |
424 | void *addr_buf; | |
425 | struct sctp_af *af; | |
1da177e4 LT |
426 | int i; |
427 | ||
559cf710 VY |
428 | /* This is only called sctp_send_asconf_del_ip() and we hold |
429 | * the socket lock in that code patch, so that address list | |
430 | * can't change. | |
431 | */ | |
432 | list_for_each_entry(laddr, &bp->address_list, list) { | |
1da177e4 LT |
433 | addr_buf = (union sctp_addr *)addrs; |
434 | for (i = 0; i < addrcnt; i++) { | |
435 | addr = (union sctp_addr *)addr_buf; | |
436 | af = sctp_get_af_specific(addr->v4.sin_family); | |
d808ad9a | 437 | if (!af) |
559cf710 | 438 | break; |
1da177e4 | 439 | |
5f242a13 | 440 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
1da177e4 LT |
441 | break; |
442 | ||
443 | addr_buf += af->sockaddr_len; | |
444 | } | |
445 | if (i == addrcnt) | |
5ae955cf | 446 | return &laddr->a; |
1da177e4 LT |
447 | } |
448 | ||
449 | return NULL; | |
450 | } | |
451 | ||
452 | /* Copy out addresses from the global local address list. */ | |
d808ad9a | 453 | static int sctp_copy_one_addr(struct sctp_bind_addr *dest, |
1da177e4 | 454 | union sctp_addr *addr, |
dd0fc66f | 455 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 456 | int flags) |
1da177e4 LT |
457 | { |
458 | int error = 0; | |
459 | ||
52cae8f0 | 460 | if (sctp_is_any(NULL, addr)) { |
1da177e4 LT |
461 | error = sctp_copy_local_addr_list(dest, scope, gfp, flags); |
462 | } else if (sctp_in_scope(addr, scope)) { | |
463 | /* Now that the address is in scope, check to see if | |
464 | * the address type is supported by local sock as | |
465 | * well as the remote peer. | |
466 | */ | |
467 | if ((((AF_INET == addr->sa.sa_family) && | |
468 | (flags & SCTP_ADDR4_PEERSUPP))) || | |
469 | (((AF_INET6 == addr->sa.sa_family) && | |
470 | (flags & SCTP_ADDR6_ALLOWED) && | |
471 | (flags & SCTP_ADDR6_PEERSUPP)))) | |
f57d96b2 VY |
472 | error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC, |
473 | gfp); | |
1da177e4 LT |
474 | } |
475 | ||
476 | return error; | |
477 | } | |
478 | ||
479 | /* Is this a wildcard address? */ | |
52cae8f0 | 480 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr) |
1da177e4 | 481 | { |
52cae8f0 VY |
482 | unsigned short fam = 0; |
483 | struct sctp_af *af; | |
484 | ||
485 | /* Try to get the right address family */ | |
486 | if (addr->sa.sa_family != AF_UNSPEC) | |
487 | fam = addr->sa.sa_family; | |
488 | else if (sk) | |
489 | fam = sk->sk_family; | |
490 | ||
491 | af = sctp_get_af_specific(fam); | |
1da177e4 LT |
492 | if (!af) |
493 | return 0; | |
52cae8f0 | 494 | |
1da177e4 LT |
495 | return af->is_any(addr); |
496 | } | |
497 | ||
498 | /* Is 'addr' valid for 'scope'? */ | |
499 | int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) | |
500 | { | |
501 | sctp_scope_t addr_scope = sctp_scope(addr); | |
502 | ||
503 | /* The unusable SCTP addresses will not be considered with | |
504 | * any defined scopes. | |
505 | */ | |
506 | if (SCTP_SCOPE_UNUSABLE == addr_scope) | |
507 | return 0; | |
508 | /* | |
509 | * For INIT and INIT-ACK address list, let L be the level of | |
510 | * of requested destination address, sender and receiver | |
511 | * SHOULD include all of its addresses with level greater | |
512 | * than or equal to L. | |
72388433 BD |
513 | * |
514 | * Address scoping can be selectively controlled via sysctl | |
515 | * option | |
1da177e4 | 516 | */ |
72388433 BD |
517 | switch (sctp_scope_policy) { |
518 | case SCTP_SCOPE_POLICY_DISABLE: | |
1da177e4 | 519 | return 1; |
72388433 BD |
520 | case SCTP_SCOPE_POLICY_ENABLE: |
521 | if (addr_scope <= scope) | |
522 | return 1; | |
523 | break; | |
524 | case SCTP_SCOPE_POLICY_PRIVATE: | |
525 | if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) | |
526 | return 1; | |
527 | break; | |
528 | case SCTP_SCOPE_POLICY_LINK: | |
529 | if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) | |
530 | return 1; | |
531 | break; | |
532 | default: | |
533 | break; | |
534 | } | |
1da177e4 LT |
535 | |
536 | return 0; | |
537 | } | |
538 | ||
539 | /******************************************************************** | |
540 | * 3rd Level Abstractions | |
541 | ********************************************************************/ | |
542 | ||
543 | /* What is the scope of 'addr'? */ | |
544 | sctp_scope_t sctp_scope(const union sctp_addr *addr) | |
545 | { | |
546 | struct sctp_af *af; | |
547 | ||
548 | af = sctp_get_af_specific(addr->sa.sa_family); | |
549 | if (!af) | |
550 | return SCTP_SCOPE_UNUSABLE; | |
551 | ||
552 | return af->scope((union sctp_addr *)addr); | |
553 | } |