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 | |
4b2f13a2 JK |
24 | * along with GNU CC; see the file COPYING. If not, see |
25 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
26 | * |
27 | * Please send any bug reports or fixes you make to the | |
28 | * email address(es): | |
91705c61 | 29 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 30 | * |
1da177e4 LT |
31 | * Written or modified by: |
32 | * La Monte H.P. Yarroll <piggy@acm.org> | |
33 | * Karl Knutson <karl@athena.chicago.il.us> | |
34 | * Jon Grimm <jgrimm@us.ibm.com> | |
35 | * Daisy Chang <daisyc@us.ibm.com> | |
1da177e4 LT |
36 | */ |
37 | ||
38 | #include <linux/types.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #include <linux/in.h> |
41 | #include <net/sock.h> | |
42 | #include <net/ipv6.h> | |
43 | #include <net/if_inet6.h> | |
44 | #include <net/sctp/sctp.h> | |
45 | #include <net/sctp/sm.h> | |
46 | ||
47 | /* Forward declarations for internal helpers. */ | |
4db67e80 EB |
48 | static int sctp_copy_one_addr(struct net *, struct sctp_bind_addr *, |
49 | union sctp_addr *, sctp_scope_t scope, gfp_t gfp, | |
3182cd84 | 50 | int flags); |
1da177e4 LT |
51 | static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
52 | ||
53 | /* First Level Abstractions. */ | |
54 | ||
55 | /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses | |
56 | * in 'src' which have a broader scope than 'scope'. | |
57 | */ | |
4db67e80 | 58 | int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
1da177e4 | 59 | const struct sctp_bind_addr *src, |
dd0fc66f | 60 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 61 | int flags) |
1da177e4 LT |
62 | { |
63 | struct sctp_sockaddr_entry *addr; | |
1da177e4 LT |
64 | int error = 0; |
65 | ||
66 | /* All addresses share the same port. */ | |
67 | dest->port = src->port; | |
68 | ||
69 | /* Extract the addresses which are relevant for this scope. */ | |
9dbc15f0 | 70 | list_for_each_entry(addr, &src->address_list, list) { |
4db67e80 | 71 | error = sctp_copy_one_addr(net, dest, &addr->a, scope, |
1da177e4 LT |
72 | gfp, flags); |
73 | if (error < 0) | |
74 | goto out; | |
75 | } | |
76 | ||
77 | /* If there are no addresses matching the scope and | |
78 | * this is global scope, try to get a link scope address, with | |
79 | * the assumption that we must be sitting behind a NAT. | |
80 | */ | |
81 | if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { | |
9dbc15f0 | 82 | list_for_each_entry(addr, &src->address_list, list) { |
4db67e80 | 83 | error = sctp_copy_one_addr(net, dest, &addr->a, |
1da177e4 LT |
84 | SCTP_SCOPE_LINK, gfp, |
85 | flags); | |
86 | if (error < 0) | |
87 | goto out; | |
88 | } | |
89 | } | |
90 | ||
91 | out: | |
92 | if (error) | |
93 | sctp_bind_addr_clean(dest); | |
94 | ||
95 | return error; | |
96 | } | |
97 | ||
8e71a11c VY |
98 | /* Exactly duplicate the address lists. This is necessary when doing |
99 | * peer-offs and accepts. We don't want to put all the current system | |
100 | * addresses into the endpoint. That's useless. But we do want duplicat | |
101 | * the list of bound addresses that the older endpoint used. | |
102 | */ | |
103 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, | |
104 | const struct sctp_bind_addr *src, | |
105 | gfp_t gfp) | |
106 | { | |
107 | struct sctp_sockaddr_entry *addr; | |
8e71a11c VY |
108 | int error = 0; |
109 | ||
110 | /* All addresses share the same port. */ | |
111 | dest->port = src->port; | |
112 | ||
9dbc15f0 | 113 | list_for_each_entry(addr, &src->address_list, list) { |
133800d1 MRL |
114 | error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a), |
115 | 1, gfp); | |
8e71a11c VY |
116 | if (error < 0) |
117 | break; | |
118 | } | |
119 | ||
120 | return error; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* Initialize the SCTP_bind_addr structure for either an endpoint or |
124 | * an association. | |
125 | */ | |
126 | void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) | |
127 | { | |
1da177e4 LT |
128 | INIT_LIST_HEAD(&bp->address_list); |
129 | bp->port = port; | |
130 | } | |
131 | ||
132 | /* Dispose of the address list. */ | |
133 | static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) | |
134 | { | |
c182f90b | 135 | struct sctp_sockaddr_entry *addr, *temp; |
1da177e4 LT |
136 | |
137 | /* Empty the bind address list. */ | |
c182f90b JL |
138 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { |
139 | list_del_rcu(&addr->list); | |
5d414521 | 140 | kfree_rcu(addr, rcu); |
1da177e4 LT |
141 | SCTP_DBG_OBJCNT_DEC(addr); |
142 | } | |
143 | } | |
144 | ||
145 | /* Dispose of an SCTP_bind_addr structure */ | |
146 | void sctp_bind_addr_free(struct sctp_bind_addr *bp) | |
147 | { | |
148 | /* Empty the bind address list. */ | |
149 | sctp_bind_addr_clean(bp); | |
1da177e4 LT |
150 | } |
151 | ||
152 | /* Add an address to the bind address list in the SCTP_bind_addr structure. */ | |
153 | int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, | |
133800d1 | 154 | int new_size, __u8 addr_state, gfp_t gfp) |
1da177e4 LT |
155 | { |
156 | struct sctp_sockaddr_entry *addr; | |
157 | ||
158 | /* Add the address to the bind address list. */ | |
939cfa75 | 159 | addr = kzalloc(sizeof(*addr), gfp); |
1da177e4 LT |
160 | if (!addr) |
161 | return -ENOMEM; | |
162 | ||
133800d1 | 163 | memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size)); |
1da177e4 LT |
164 | |
165 | /* Fix up the port if it has not yet been set. | |
166 | * Both v4 and v6 have the port at the same offset. | |
167 | */ | |
5ab7b859 AV |
168 | if (!addr->a.v4.sin_port) |
169 | addr->a.v4.sin_port = htons(bp->port); | |
1da177e4 | 170 | |
f57d96b2 | 171 | addr->state = addr_state; |
29303547 | 172 | addr->valid = 1; |
dc022a98 | 173 | |
1da177e4 | 174 | INIT_LIST_HEAD(&addr->list); |
559cf710 VY |
175 | |
176 | /* We always hold a socket lock when calling this function, | |
177 | * and that acts as a writer synchronizing lock. | |
178 | */ | |
179 | list_add_tail_rcu(&addr->list, &bp->address_list); | |
1da177e4 LT |
180 | SCTP_DBG_OBJCNT_INC(addr); |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /* Delete an address from the bind address list in the SCTP_bind_addr | |
186 | * structure. | |
187 | */ | |
0ed90fb0 | 188 | int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) |
1da177e4 | 189 | { |
559cf710 | 190 | struct sctp_sockaddr_entry *addr, *temp; |
22626216 | 191 | int found = 0; |
1da177e4 | 192 | |
559cf710 VY |
193 | /* We hold the socket lock when calling this function, |
194 | * and that acts as a writer synchronizing lock. | |
195 | */ | |
196 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { | |
c9a08505 | 197 | if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
1da177e4 | 198 | /* Found the exact match. */ |
22626216 | 199 | found = 1; |
559cf710 VY |
200 | addr->valid = 0; |
201 | list_del_rcu(&addr->list); | |
202 | break; | |
1da177e4 LT |
203 | } |
204 | } | |
205 | ||
22626216 | 206 | if (found) { |
1231f0ba | 207 | kfree_rcu(addr, rcu); |
559cf710 | 208 | SCTP_DBG_OBJCNT_DEC(addr); |
0ed90fb0 | 209 | return 0; |
559cf710 VY |
210 | } |
211 | ||
1da177e4 LT |
212 | return -EINVAL; |
213 | } | |
214 | ||
215 | /* Create a network byte-order representation of all the addresses | |
216 | * formated as SCTP parameters. | |
217 | * | |
218 | * The second argument is the return value for the length. | |
219 | */ | |
220 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 221 | int *addrs_len, |
dd0fc66f | 222 | gfp_t gfp) |
1da177e4 LT |
223 | { |
224 | union sctp_params addrparms; | |
225 | union sctp_params retval; | |
226 | int addrparms_len; | |
227 | union sctp_addr_param rawaddr; | |
228 | int len; | |
229 | struct sctp_sockaddr_entry *addr; | |
230 | struct list_head *pos; | |
231 | struct sctp_af *af; | |
232 | ||
233 | addrparms_len = 0; | |
234 | len = 0; | |
235 | ||
236 | /* Allocate enough memory at once. */ | |
237 | list_for_each(pos, &bp->address_list) { | |
238 | len += sizeof(union sctp_addr_param); | |
239 | } | |
240 | ||
241 | /* Don't even bother embedding an address if there | |
242 | * is only one. | |
243 | */ | |
244 | if (len == sizeof(union sctp_addr_param)) { | |
245 | retval.v = NULL; | |
246 | goto end_raw; | |
247 | } | |
248 | ||
249 | retval.v = kmalloc(len, gfp); | |
250 | if (!retval.v) | |
251 | goto end_raw; | |
252 | ||
253 | addrparms = retval; | |
254 | ||
9dbc15f0 | 255 | list_for_each_entry(addr, &bp->address_list, list) { |
6244be4e AV |
256 | af = sctp_get_af_specific(addr->a.v4.sin_family); |
257 | len = af->to_addr_param(&addr->a, &rawaddr); | |
1da177e4 LT |
258 | memcpy(addrparms.v, &rawaddr, len); |
259 | addrparms.v += len; | |
260 | addrparms_len += len; | |
261 | } | |
262 | ||
263 | end_raw: | |
264 | *addrs_len = addrparms_len; | |
265 | return retval; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Create an address list out of the raw address list format (IPv4 and IPv6 | |
270 | * address parameters). | |
271 | */ | |
272 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, | |
dd0fc66f | 273 | int addrs_len, __u16 port, gfp_t gfp) |
1da177e4 LT |
274 | { |
275 | union sctp_addr_param *rawaddr; | |
276 | struct sctp_paramhdr *param; | |
277 | union sctp_addr addr; | |
278 | int retval = 0; | |
279 | int len; | |
280 | struct sctp_af *af; | |
281 | ||
282 | /* Convert the raw address to standard address format */ | |
283 | while (addrs_len) { | |
284 | param = (struct sctp_paramhdr *)raw_addr_list; | |
285 | rawaddr = (union sctp_addr_param *)raw_addr_list; | |
286 | ||
287 | af = sctp_get_af_specific(param_type2af(param->type)); | |
288 | if (unlikely(!af)) { | |
289 | retval = -EINVAL; | |
290 | sctp_bind_addr_clean(bp); | |
291 | break; | |
292 | } | |
293 | ||
dd86d136 | 294 | af->from_addr_param(&addr, rawaddr, htons(port), 0); |
b8607805 XL |
295 | if (sctp_bind_addr_state(bp, &addr) != -1) |
296 | goto next; | |
133800d1 MRL |
297 | retval = sctp_add_bind_addr(bp, &addr, sizeof(addr), |
298 | SCTP_ADDR_SRC, gfp); | |
1da177e4 LT |
299 | if (retval) { |
300 | /* Can't finish building the list, clean up. */ | |
301 | sctp_bind_addr_clean(bp); | |
302 | break; | |
303 | } | |
304 | ||
b8607805 | 305 | next: |
1da177e4 LT |
306 | len = ntohs(param->length); |
307 | addrs_len -= len; | |
308 | raw_addr_list += len; | |
309 | } | |
310 | ||
311 | return retval; | |
312 | } | |
313 | ||
314 | /******************************************************************** | |
315 | * 2nd Level Abstractions | |
316 | ********************************************************************/ | |
317 | ||
318 | /* Does this contain a specified address? Allow wildcarding. */ | |
d808ad9a | 319 | int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
1da177e4 LT |
320 | const union sctp_addr *addr, |
321 | struct sctp_sock *opt) | |
322 | { | |
323 | struct sctp_sockaddr_entry *laddr; | |
559cf710 VY |
324 | int match = 0; |
325 | ||
326 | rcu_read_lock(); | |
327 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
328 | if (!laddr->valid) | |
329 | continue; | |
330 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { | |
331 | match = 1; | |
332 | break; | |
333 | } | |
1da177e4 | 334 | } |
559cf710 | 335 | rcu_read_unlock(); |
1da177e4 | 336 | |
559cf710 | 337 | return match; |
1da177e4 LT |
338 | } |
339 | ||
7dab83de VY |
340 | /* Does the address 'addr' conflict with any addresses in |
341 | * the bp. | |
342 | */ | |
343 | int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, | |
344 | const union sctp_addr *addr, | |
345 | struct sctp_sock *bp_sp, | |
346 | struct sctp_sock *addr_sp) | |
347 | { | |
348 | struct sctp_sockaddr_entry *laddr; | |
349 | int conflict = 0; | |
350 | struct sctp_sock *sp; | |
351 | ||
352 | /* Pick the IPv6 socket as the basis of comparison | |
353 | * since it's usually a superset of the IPv4. | |
354 | * If there is no IPv6 socket, then default to bind_addr. | |
355 | */ | |
356 | if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) | |
357 | sp = bp_sp; | |
358 | else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) | |
359 | sp = addr_sp; | |
360 | else | |
361 | sp = bp_sp; | |
362 | ||
363 | rcu_read_lock(); | |
364 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
365 | if (!laddr->valid) | |
366 | continue; | |
367 | ||
368 | conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); | |
369 | if (conflict) | |
370 | break; | |
371 | } | |
372 | rcu_read_unlock(); | |
373 | ||
374 | return conflict; | |
375 | } | |
376 | ||
75205f47 VY |
377 | /* Get the state of the entry in the bind_addr_list */ |
378 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, | |
379 | const union sctp_addr *addr) | |
380 | { | |
381 | struct sctp_sockaddr_entry *laddr; | |
382 | struct sctp_af *af; | |
383 | int state = -1; | |
384 | ||
385 | af = sctp_get_af_specific(addr->sa.sa_family); | |
386 | if (unlikely(!af)) | |
387 | return state; | |
388 | ||
389 | rcu_read_lock(); | |
390 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
391 | if (!laddr->valid) | |
392 | continue; | |
393 | if (af->cmp_addr(&laddr->a, addr)) { | |
394 | state = laddr->state; | |
395 | break; | |
396 | } | |
397 | } | |
398 | rcu_read_unlock(); | |
399 | ||
400 | return state; | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /* Find the first address in the bind address list that is not present in |
404 | * the addrs packed array. | |
405 | */ | |
406 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
407 | const union sctp_addr *addrs, | |
408 | int addrcnt, | |
409 | struct sctp_sock *opt) | |
410 | { | |
411 | struct sctp_sockaddr_entry *laddr; | |
412 | union sctp_addr *addr; | |
413 | void *addr_buf; | |
414 | struct sctp_af *af; | |
1da177e4 LT |
415 | int i; |
416 | ||
559cf710 VY |
417 | /* This is only called sctp_send_asconf_del_ip() and we hold |
418 | * the socket lock in that code patch, so that address list | |
419 | * can't change. | |
420 | */ | |
421 | list_for_each_entry(laddr, &bp->address_list, list) { | |
1da177e4 LT |
422 | addr_buf = (union sctp_addr *)addrs; |
423 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 424 | addr = addr_buf; |
1da177e4 | 425 | af = sctp_get_af_specific(addr->v4.sin_family); |
d808ad9a | 426 | if (!af) |
559cf710 | 427 | break; |
1da177e4 | 428 | |
5f242a13 | 429 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
1da177e4 LT |
430 | break; |
431 | ||
432 | addr_buf += af->sockaddr_len; | |
433 | } | |
434 | if (i == addrcnt) | |
5ae955cf | 435 | return &laddr->a; |
1da177e4 LT |
436 | } |
437 | ||
438 | return NULL; | |
439 | } | |
440 | ||
441 | /* Copy out addresses from the global local address list. */ | |
4db67e80 | 442 | static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, |
1da177e4 | 443 | union sctp_addr *addr, |
dd0fc66f | 444 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 445 | int flags) |
1da177e4 LT |
446 | { |
447 | int error = 0; | |
448 | ||
52cae8f0 | 449 | if (sctp_is_any(NULL, addr)) { |
4db67e80 | 450 | error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags); |
e7ff4a70 | 451 | } else if (sctp_in_scope(net, addr, scope)) { |
1da177e4 LT |
452 | /* Now that the address is in scope, check to see if |
453 | * the address type is supported by local sock as | |
454 | * well as the remote peer. | |
455 | */ | |
456 | if ((((AF_INET == addr->sa.sa_family) && | |
457 | (flags & SCTP_ADDR4_PEERSUPP))) || | |
458 | (((AF_INET6 == addr->sa.sa_family) && | |
459 | (flags & SCTP_ADDR6_ALLOWED) && | |
460 | (flags & SCTP_ADDR6_PEERSUPP)))) | |
133800d1 MRL |
461 | error = sctp_add_bind_addr(dest, addr, sizeof(*addr), |
462 | SCTP_ADDR_SRC, gfp); | |
1da177e4 LT |
463 | } |
464 | ||
465 | return error; | |
466 | } | |
467 | ||
468 | /* Is this a wildcard address? */ | |
52cae8f0 | 469 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr) |
1da177e4 | 470 | { |
52cae8f0 VY |
471 | unsigned short fam = 0; |
472 | struct sctp_af *af; | |
473 | ||
474 | /* Try to get the right address family */ | |
475 | if (addr->sa.sa_family != AF_UNSPEC) | |
476 | fam = addr->sa.sa_family; | |
477 | else if (sk) | |
478 | fam = sk->sk_family; | |
479 | ||
480 | af = sctp_get_af_specific(fam); | |
1da177e4 LT |
481 | if (!af) |
482 | return 0; | |
52cae8f0 | 483 | |
1da177e4 LT |
484 | return af->is_any(addr); |
485 | } | |
486 | ||
487 | /* Is 'addr' valid for 'scope'? */ | |
e7ff4a70 | 488 | int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope) |
1da177e4 LT |
489 | { |
490 | sctp_scope_t addr_scope = sctp_scope(addr); | |
491 | ||
492 | /* The unusable SCTP addresses will not be considered with | |
493 | * any defined scopes. | |
494 | */ | |
495 | if (SCTP_SCOPE_UNUSABLE == addr_scope) | |
496 | return 0; | |
497 | /* | |
498 | * For INIT and INIT-ACK address list, let L be the level of | |
499 | * of requested destination address, sender and receiver | |
500 | * SHOULD include all of its addresses with level greater | |
501 | * than or equal to L. | |
72388433 BD |
502 | * |
503 | * Address scoping can be selectively controlled via sysctl | |
504 | * option | |
1da177e4 | 505 | */ |
e1fc3b14 | 506 | switch (net->sctp.scope_policy) { |
72388433 | 507 | case SCTP_SCOPE_POLICY_DISABLE: |
1da177e4 | 508 | return 1; |
72388433 BD |
509 | case SCTP_SCOPE_POLICY_ENABLE: |
510 | if (addr_scope <= scope) | |
511 | return 1; | |
512 | break; | |
513 | case SCTP_SCOPE_POLICY_PRIVATE: | |
514 | if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) | |
515 | return 1; | |
516 | break; | |
517 | case SCTP_SCOPE_POLICY_LINK: | |
518 | if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) | |
519 | return 1; | |
520 | break; | |
521 | default: | |
522 | break; | |
523 | } | |
1da177e4 LT |
524 | |
525 | return 0; | |
526 | } | |
527 | ||
9f7d653b MH |
528 | int sctp_is_ep_boundall(struct sock *sk) |
529 | { | |
530 | struct sctp_bind_addr *bp; | |
531 | struct sctp_sockaddr_entry *addr; | |
532 | ||
533 | bp = &sctp_sk(sk)->ep->base.bind_addr; | |
534 | if (sctp_list_single_entry(&bp->address_list)) { | |
535 | addr = list_entry(bp->address_list.next, | |
536 | struct sctp_sockaddr_entry, list); | |
537 | if (sctp_is_any(sk, &addr->a)) | |
538 | return 1; | |
539 | } | |
540 | return 0; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /******************************************************************** |
544 | * 3rd Level Abstractions | |
545 | ********************************************************************/ | |
546 | ||
547 | /* What is the scope of 'addr'? */ | |
548 | sctp_scope_t sctp_scope(const union sctp_addr *addr) | |
549 | { | |
550 | struct sctp_af *af; | |
551 | ||
552 | af = sctp_get_af_specific(addr->sa.sa_family); | |
553 | if (!af) | |
554 | return SCTP_SCOPE_UNUSABLE; | |
555 | ||
556 | return af->scope((union sctp_addr *)addr); | |
557 | } |