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