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> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
1da177e4 LT |
47 | #include <linux/in.h> |
48 | #include <net/sock.h> | |
49 | #include <net/ipv6.h> | |
50 | #include <net/if_inet6.h> | |
51 | #include <net/sctp/sctp.h> | |
52 | #include <net/sctp/sm.h> | |
53 | ||
54 | /* Forward declarations for internal helpers. */ | |
55 | static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *, | |
dd0fc66f | 56 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 57 | int flags); |
1da177e4 LT |
58 | static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
59 | ||
60 | /* First Level Abstractions. */ | |
61 | ||
62 | /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses | |
63 | * in 'src' which have a broader scope than 'scope'. | |
64 | */ | |
d808ad9a | 65 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, |
1da177e4 | 66 | const struct sctp_bind_addr *src, |
dd0fc66f | 67 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 68 | int flags) |
1da177e4 LT |
69 | { |
70 | struct sctp_sockaddr_entry *addr; | |
1da177e4 LT |
71 | int error = 0; |
72 | ||
73 | /* All addresses share the same port. */ | |
74 | dest->port = src->port; | |
75 | ||
76 | /* Extract the addresses which are relevant for this scope. */ | |
9dbc15f0 | 77 | list_for_each_entry(addr, &src->address_list, list) { |
02a8a4db | 78 | error = sctp_copy_one_addr(dest, &addr->a, scope, |
1da177e4 LT |
79 | gfp, flags); |
80 | if (error < 0) | |
81 | goto out; | |
82 | } | |
83 | ||
84 | /* If there are no addresses matching the scope and | |
85 | * this is global scope, try to get a link scope address, with | |
86 | * the assumption that we must be sitting behind a NAT. | |
87 | */ | |
88 | if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { | |
9dbc15f0 | 89 | list_for_each_entry(addr, &src->address_list, list) { |
02a8a4db | 90 | error = sctp_copy_one_addr(dest, &addr->a, |
1da177e4 LT |
91 | SCTP_SCOPE_LINK, gfp, |
92 | flags); | |
93 | if (error < 0) | |
94 | goto out; | |
95 | } | |
96 | } | |
97 | ||
98 | out: | |
99 | if (error) | |
100 | sctp_bind_addr_clean(dest); | |
101 | ||
102 | return error; | |
103 | } | |
104 | ||
8e71a11c VY |
105 | /* Exactly duplicate the address lists. This is necessary when doing |
106 | * peer-offs and accepts. We don't want to put all the current system | |
107 | * addresses into the endpoint. That's useless. But we do want duplicat | |
108 | * the list of bound addresses that the older endpoint used. | |
109 | */ | |
110 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, | |
111 | const struct sctp_bind_addr *src, | |
112 | gfp_t gfp) | |
113 | { | |
114 | struct sctp_sockaddr_entry *addr; | |
8e71a11c VY |
115 | int error = 0; |
116 | ||
117 | /* All addresses share the same port. */ | |
118 | dest->port = src->port; | |
119 | ||
9dbc15f0 | 120 | list_for_each_entry(addr, &src->address_list, list) { |
8e71a11c VY |
121 | error = sctp_add_bind_addr(dest, &addr->a, 1, gfp); |
122 | if (error < 0) | |
123 | break; | |
124 | } | |
125 | ||
126 | return error; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | /* Initialize the SCTP_bind_addr structure for either an endpoint or |
130 | * an association. | |
131 | */ | |
132 | void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) | |
133 | { | |
134 | bp->malloced = 0; | |
135 | ||
136 | INIT_LIST_HEAD(&bp->address_list); | |
137 | bp->port = port; | |
138 | } | |
139 | ||
140 | /* Dispose of the address list. */ | |
141 | static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) | |
142 | { | |
c182f90b | 143 | struct sctp_sockaddr_entry *addr, *temp; |
1da177e4 LT |
144 | |
145 | /* Empty the bind address list. */ | |
c182f90b JL |
146 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { |
147 | list_del_rcu(&addr->list); | |
5d414521 | 148 | kfree_rcu(addr, rcu); |
1da177e4 LT |
149 | SCTP_DBG_OBJCNT_DEC(addr); |
150 | } | |
151 | } | |
152 | ||
153 | /* Dispose of an SCTP_bind_addr structure */ | |
154 | void sctp_bind_addr_free(struct sctp_bind_addr *bp) | |
155 | { | |
156 | /* Empty the bind address list. */ | |
157 | sctp_bind_addr_clean(bp); | |
158 | ||
159 | if (bp->malloced) { | |
160 | kfree(bp); | |
161 | SCTP_DBG_OBJCNT_DEC(bind_addr); | |
162 | } | |
163 | } | |
164 | ||
165 | /* Add an address to the bind address list in the SCTP_bind_addr structure. */ | |
166 | int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, | |
f57d96b2 | 167 | __u8 addr_state, gfp_t gfp) |
1da177e4 LT |
168 | { |
169 | struct sctp_sockaddr_entry *addr; | |
170 | ||
171 | /* Add the address to the bind address list. */ | |
172 | addr = t_new(struct sctp_sockaddr_entry, gfp); | |
173 | if (!addr) | |
174 | return -ENOMEM; | |
175 | ||
5ab7b859 | 176 | memcpy(&addr->a, new, sizeof(*new)); |
1da177e4 LT |
177 | |
178 | /* Fix up the port if it has not yet been set. | |
179 | * Both v4 and v6 have the port at the same offset. | |
180 | */ | |
5ab7b859 AV |
181 | if (!addr->a.v4.sin_port) |
182 | addr->a.v4.sin_port = htons(bp->port); | |
1da177e4 | 183 | |
f57d96b2 | 184 | addr->state = addr_state; |
29303547 | 185 | addr->valid = 1; |
dc022a98 | 186 | |
1da177e4 | 187 | INIT_LIST_HEAD(&addr->list); |
559cf710 VY |
188 | |
189 | /* We always hold a socket lock when calling this function, | |
190 | * and that acts as a writer synchronizing lock. | |
191 | */ | |
192 | list_add_tail_rcu(&addr->list, &bp->address_list); | |
1da177e4 LT |
193 | SCTP_DBG_OBJCNT_INC(addr); |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /* Delete an address from the bind address list in the SCTP_bind_addr | |
199 | * structure. | |
200 | */ | |
0ed90fb0 | 201 | int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) |
1da177e4 | 202 | { |
559cf710 | 203 | struct sctp_sockaddr_entry *addr, *temp; |
22626216 | 204 | int found = 0; |
1da177e4 | 205 | |
559cf710 VY |
206 | /* We hold the socket lock when calling this function, |
207 | * and that acts as a writer synchronizing lock. | |
208 | */ | |
209 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { | |
c9a08505 | 210 | if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
1da177e4 | 211 | /* Found the exact match. */ |
22626216 | 212 | found = 1; |
559cf710 VY |
213 | addr->valid = 0; |
214 | list_del_rcu(&addr->list); | |
215 | break; | |
1da177e4 LT |
216 | } |
217 | } | |
218 | ||
22626216 | 219 | if (found) { |
1231f0ba | 220 | kfree_rcu(addr, rcu); |
559cf710 | 221 | SCTP_DBG_OBJCNT_DEC(addr); |
0ed90fb0 | 222 | return 0; |
559cf710 VY |
223 | } |
224 | ||
1da177e4 LT |
225 | return -EINVAL; |
226 | } | |
227 | ||
228 | /* Create a network byte-order representation of all the addresses | |
229 | * formated as SCTP parameters. | |
230 | * | |
231 | * The second argument is the return value for the length. | |
232 | */ | |
233 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 234 | int *addrs_len, |
dd0fc66f | 235 | gfp_t gfp) |
1da177e4 LT |
236 | { |
237 | union sctp_params addrparms; | |
238 | union sctp_params retval; | |
239 | int addrparms_len; | |
240 | union sctp_addr_param rawaddr; | |
241 | int len; | |
242 | struct sctp_sockaddr_entry *addr; | |
243 | struct list_head *pos; | |
244 | struct sctp_af *af; | |
245 | ||
246 | addrparms_len = 0; | |
247 | len = 0; | |
248 | ||
249 | /* Allocate enough memory at once. */ | |
250 | list_for_each(pos, &bp->address_list) { | |
251 | len += sizeof(union sctp_addr_param); | |
252 | } | |
253 | ||
254 | /* Don't even bother embedding an address if there | |
255 | * is only one. | |
256 | */ | |
257 | if (len == sizeof(union sctp_addr_param)) { | |
258 | retval.v = NULL; | |
259 | goto end_raw; | |
260 | } | |
261 | ||
262 | retval.v = kmalloc(len, gfp); | |
263 | if (!retval.v) | |
264 | goto end_raw; | |
265 | ||
266 | addrparms = retval; | |
267 | ||
9dbc15f0 | 268 | list_for_each_entry(addr, &bp->address_list, list) { |
6244be4e AV |
269 | af = sctp_get_af_specific(addr->a.v4.sin_family); |
270 | len = af->to_addr_param(&addr->a, &rawaddr); | |
1da177e4 LT |
271 | memcpy(addrparms.v, &rawaddr, len); |
272 | addrparms.v += len; | |
273 | addrparms_len += len; | |
274 | } | |
275 | ||
276 | end_raw: | |
277 | *addrs_len = addrparms_len; | |
278 | return retval; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Create an address list out of the raw address list format (IPv4 and IPv6 | |
283 | * address parameters). | |
284 | */ | |
285 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, | |
dd0fc66f | 286 | int addrs_len, __u16 port, gfp_t gfp) |
1da177e4 LT |
287 | { |
288 | union sctp_addr_param *rawaddr; | |
289 | struct sctp_paramhdr *param; | |
290 | union sctp_addr addr; | |
291 | int retval = 0; | |
292 | int len; | |
293 | struct sctp_af *af; | |
294 | ||
295 | /* Convert the raw address to standard address format */ | |
296 | while (addrs_len) { | |
297 | param = (struct sctp_paramhdr *)raw_addr_list; | |
298 | rawaddr = (union sctp_addr_param *)raw_addr_list; | |
299 | ||
300 | af = sctp_get_af_specific(param_type2af(param->type)); | |
301 | if (unlikely(!af)) { | |
302 | retval = -EINVAL; | |
303 | sctp_bind_addr_clean(bp); | |
304 | break; | |
305 | } | |
306 | ||
dd86d136 | 307 | af->from_addr_param(&addr, rawaddr, htons(port), 0); |
f57d96b2 | 308 | retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp); |
1da177e4 LT |
309 | if (retval) { |
310 | /* Can't finish building the list, clean up. */ | |
311 | sctp_bind_addr_clean(bp); | |
312 | break; | |
313 | } | |
314 | ||
315 | len = ntohs(param->length); | |
316 | addrs_len -= len; | |
317 | raw_addr_list += len; | |
318 | } | |
319 | ||
320 | return retval; | |
321 | } | |
322 | ||
323 | /******************************************************************** | |
324 | * 2nd Level Abstractions | |
325 | ********************************************************************/ | |
326 | ||
327 | /* Does this contain a specified address? Allow wildcarding. */ | |
d808ad9a | 328 | int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
1da177e4 LT |
329 | const union sctp_addr *addr, |
330 | struct sctp_sock *opt) | |
331 | { | |
332 | struct sctp_sockaddr_entry *laddr; | |
559cf710 VY |
333 | int match = 0; |
334 | ||
335 | rcu_read_lock(); | |
336 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
337 | if (!laddr->valid) | |
338 | continue; | |
339 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { | |
340 | match = 1; | |
341 | break; | |
342 | } | |
1da177e4 | 343 | } |
559cf710 | 344 | rcu_read_unlock(); |
1da177e4 | 345 | |
559cf710 | 346 | return match; |
1da177e4 LT |
347 | } |
348 | ||
7dab83de VY |
349 | /* Does the address 'addr' conflict with any addresses in |
350 | * the bp. | |
351 | */ | |
352 | int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, | |
353 | const union sctp_addr *addr, | |
354 | struct sctp_sock *bp_sp, | |
355 | struct sctp_sock *addr_sp) | |
356 | { | |
357 | struct sctp_sockaddr_entry *laddr; | |
358 | int conflict = 0; | |
359 | struct sctp_sock *sp; | |
360 | ||
361 | /* Pick the IPv6 socket as the basis of comparison | |
362 | * since it's usually a superset of the IPv4. | |
363 | * If there is no IPv6 socket, then default to bind_addr. | |
364 | */ | |
365 | if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) | |
366 | sp = bp_sp; | |
367 | else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) | |
368 | sp = addr_sp; | |
369 | else | |
370 | sp = bp_sp; | |
371 | ||
372 | rcu_read_lock(); | |
373 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
374 | if (!laddr->valid) | |
375 | continue; | |
376 | ||
377 | conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); | |
378 | if (conflict) | |
379 | break; | |
380 | } | |
381 | rcu_read_unlock(); | |
382 | ||
383 | return conflict; | |
384 | } | |
385 | ||
75205f47 VY |
386 | /* Get the state of the entry in the bind_addr_list */ |
387 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, | |
388 | const union sctp_addr *addr) | |
389 | { | |
390 | struct sctp_sockaddr_entry *laddr; | |
391 | struct sctp_af *af; | |
392 | int state = -1; | |
393 | ||
394 | af = sctp_get_af_specific(addr->sa.sa_family); | |
395 | if (unlikely(!af)) | |
396 | return state; | |
397 | ||
398 | rcu_read_lock(); | |
399 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
400 | if (!laddr->valid) | |
401 | continue; | |
402 | if (af->cmp_addr(&laddr->a, addr)) { | |
403 | state = laddr->state; | |
404 | break; | |
405 | } | |
406 | } | |
407 | rcu_read_unlock(); | |
408 | ||
409 | return state; | |
410 | } | |
411 | ||
1da177e4 LT |
412 | /* Find the first address in the bind address list that is not present in |
413 | * the addrs packed array. | |
414 | */ | |
415 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
416 | const union sctp_addr *addrs, | |
417 | int addrcnt, | |
418 | struct sctp_sock *opt) | |
419 | { | |
420 | struct sctp_sockaddr_entry *laddr; | |
421 | union sctp_addr *addr; | |
422 | void *addr_buf; | |
423 | struct sctp_af *af; | |
1da177e4 LT |
424 | int i; |
425 | ||
559cf710 VY |
426 | /* This is only called sctp_send_asconf_del_ip() and we hold |
427 | * the socket lock in that code patch, so that address list | |
428 | * can't change. | |
429 | */ | |
430 | list_for_each_entry(laddr, &bp->address_list, list) { | |
1da177e4 LT |
431 | addr_buf = (union sctp_addr *)addrs; |
432 | for (i = 0; i < addrcnt; i++) { | |
433 | addr = (union sctp_addr *)addr_buf; | |
434 | af = sctp_get_af_specific(addr->v4.sin_family); | |
d808ad9a | 435 | if (!af) |
559cf710 | 436 | break; |
1da177e4 | 437 | |
5f242a13 | 438 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
1da177e4 LT |
439 | break; |
440 | ||
441 | addr_buf += af->sockaddr_len; | |
442 | } | |
443 | if (i == addrcnt) | |
5ae955cf | 444 | return &laddr->a; |
1da177e4 LT |
445 | } |
446 | ||
447 | return NULL; | |
448 | } | |
449 | ||
450 | /* Copy out addresses from the global local address list. */ | |
d808ad9a | 451 | static int sctp_copy_one_addr(struct sctp_bind_addr *dest, |
1da177e4 | 452 | union sctp_addr *addr, |
dd0fc66f | 453 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 454 | int flags) |
1da177e4 LT |
455 | { |
456 | int error = 0; | |
457 | ||
52cae8f0 | 458 | if (sctp_is_any(NULL, addr)) { |
1da177e4 LT |
459 | error = sctp_copy_local_addr_list(dest, scope, gfp, flags); |
460 | } else if (sctp_in_scope(addr, scope)) { | |
461 | /* Now that the address is in scope, check to see if | |
462 | * the address type is supported by local sock as | |
463 | * well as the remote peer. | |
464 | */ | |
465 | if ((((AF_INET == addr->sa.sa_family) && | |
466 | (flags & SCTP_ADDR4_PEERSUPP))) || | |
467 | (((AF_INET6 == addr->sa.sa_family) && | |
468 | (flags & SCTP_ADDR6_ALLOWED) && | |
469 | (flags & SCTP_ADDR6_PEERSUPP)))) | |
f57d96b2 VY |
470 | error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC, |
471 | gfp); | |
1da177e4 LT |
472 | } |
473 | ||
474 | return error; | |
475 | } | |
476 | ||
477 | /* Is this a wildcard address? */ | |
52cae8f0 | 478 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr) |
1da177e4 | 479 | { |
52cae8f0 VY |
480 | unsigned short fam = 0; |
481 | struct sctp_af *af; | |
482 | ||
483 | /* Try to get the right address family */ | |
484 | if (addr->sa.sa_family != AF_UNSPEC) | |
485 | fam = addr->sa.sa_family; | |
486 | else if (sk) | |
487 | fam = sk->sk_family; | |
488 | ||
489 | af = sctp_get_af_specific(fam); | |
1da177e4 LT |
490 | if (!af) |
491 | return 0; | |
52cae8f0 | 492 | |
1da177e4 LT |
493 | return af->is_any(addr); |
494 | } | |
495 | ||
496 | /* Is 'addr' valid for 'scope'? */ | |
497 | int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) | |
498 | { | |
499 | sctp_scope_t addr_scope = sctp_scope(addr); | |
500 | ||
501 | /* The unusable SCTP addresses will not be considered with | |
502 | * any defined scopes. | |
503 | */ | |
504 | if (SCTP_SCOPE_UNUSABLE == addr_scope) | |
505 | return 0; | |
506 | /* | |
507 | * For INIT and INIT-ACK address list, let L be the level of | |
508 | * of requested destination address, sender and receiver | |
509 | * SHOULD include all of its addresses with level greater | |
510 | * than or equal to L. | |
72388433 BD |
511 | * |
512 | * Address scoping can be selectively controlled via sysctl | |
513 | * option | |
1da177e4 | 514 | */ |
72388433 BD |
515 | switch (sctp_scope_policy) { |
516 | case SCTP_SCOPE_POLICY_DISABLE: | |
1da177e4 | 517 | return 1; |
72388433 BD |
518 | case SCTP_SCOPE_POLICY_ENABLE: |
519 | if (addr_scope <= scope) | |
520 | return 1; | |
521 | break; | |
522 | case SCTP_SCOPE_POLICY_PRIVATE: | |
523 | if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) | |
524 | return 1; | |
525 | break; | |
526 | case SCTP_SCOPE_POLICY_LINK: | |
527 | if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) | |
528 | return 1; | |
529 | break; | |
530 | default: | |
531 | break; | |
532 | } | |
1da177e4 LT |
533 | |
534 | return 0; | |
535 | } | |
536 | ||
537 | /******************************************************************** | |
538 | * 3rd Level Abstractions | |
539 | ********************************************************************/ | |
540 | ||
541 | /* What is the scope of 'addr'? */ | |
542 | sctp_scope_t sctp_scope(const union sctp_addr *addr) | |
543 | { | |
544 | struct sctp_af *af; | |
545 | ||
546 | af = sctp_get_af_specific(addr->sa.sa_family); | |
547 | if (!af) | |
548 | return SCTP_SCOPE_UNUSABLE; | |
549 | ||
550 | return af->scope((union sctp_addr *)addr); | |
551 | } |