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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2003 |
4 | * Copyright (c) Cisco 1999,2000 | |
5 | * Copyright (c) Motorola 1999,2000,2001 | |
6 | * Copyright (c) La Monte H.P. Yarroll 2001 | |
7 | * | |
60c778b2 | 8 | * This file is part of the SCTP kernel implementation. |
1da177e4 LT |
9 | * |
10 | * A collection class to handle the storage of transport addresses. | |
11 | * | |
1da177e4 LT |
12 | * Please send any bug reports or fixes you make to the |
13 | * email address(es): | |
91705c61 | 14 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 15 | * |
1da177e4 LT |
16 | * Written or modified by: |
17 | * La Monte H.P. Yarroll <piggy@acm.org> | |
18 | * Karl Knutson <karl@athena.chicago.il.us> | |
19 | * Jon Grimm <jgrimm@us.ibm.com> | |
20 | * Daisy Chang <daisyc@us.ibm.com> | |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/types.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <linux/in.h> |
26 | #include <net/sock.h> | |
27 | #include <net/ipv6.h> | |
28 | #include <net/if_inet6.h> | |
29 | #include <net/sctp/sctp.h> | |
30 | #include <net/sctp/sm.h> | |
31 | ||
32 | /* Forward declarations for internal helpers. */ | |
1c662018 XL |
33 | static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, |
34 | union sctp_addr *addr, enum sctp_scope scope, | |
35 | gfp_t gfp, int flags); | |
1da177e4 LT |
36 | static void sctp_bind_addr_clean(struct sctp_bind_addr *); |
37 | ||
38 | /* First Level Abstractions. */ | |
39 | ||
40 | /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses | |
41 | * in 'src' which have a broader scope than 'scope'. | |
42 | */ | |
4db67e80 | 43 | int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
1da177e4 | 44 | const struct sctp_bind_addr *src, |
1c662018 | 45 | enum sctp_scope scope, gfp_t gfp, |
3182cd84 | 46 | int flags) |
1da177e4 LT |
47 | { |
48 | struct sctp_sockaddr_entry *addr; | |
1da177e4 LT |
49 | int error = 0; |
50 | ||
51 | /* All addresses share the same port. */ | |
52 | dest->port = src->port; | |
53 | ||
54 | /* Extract the addresses which are relevant for this scope. */ | |
9dbc15f0 | 55 | list_for_each_entry(addr, &src->address_list, list) { |
4db67e80 | 56 | error = sctp_copy_one_addr(net, dest, &addr->a, scope, |
1da177e4 LT |
57 | gfp, flags); |
58 | if (error < 0) | |
59 | goto out; | |
60 | } | |
61 | ||
62 | /* If there are no addresses matching the scope and | |
63 | * this is global scope, try to get a link scope address, with | |
64 | * the assumption that we must be sitting behind a NAT. | |
65 | */ | |
66 | if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { | |
9dbc15f0 | 67 | list_for_each_entry(addr, &src->address_list, list) { |
4db67e80 | 68 | error = sctp_copy_one_addr(net, dest, &addr->a, |
1da177e4 LT |
69 | SCTP_SCOPE_LINK, gfp, |
70 | flags); | |
71 | if (error < 0) | |
72 | goto out; | |
73 | } | |
74 | } | |
75 | ||
76 | out: | |
77 | if (error) | |
78 | sctp_bind_addr_clean(dest); | |
79 | ||
80 | return error; | |
81 | } | |
82 | ||
8e71a11c VY |
83 | /* Exactly duplicate the address lists. This is necessary when doing |
84 | * peer-offs and accepts. We don't want to put all the current system | |
85 | * addresses into the endpoint. That's useless. But we do want duplicat | |
86 | * the list of bound addresses that the older endpoint used. | |
87 | */ | |
88 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, | |
89 | const struct sctp_bind_addr *src, | |
90 | gfp_t gfp) | |
91 | { | |
92 | struct sctp_sockaddr_entry *addr; | |
8e71a11c VY |
93 | int error = 0; |
94 | ||
95 | /* All addresses share the same port. */ | |
96 | dest->port = src->port; | |
97 | ||
9dbc15f0 | 98 | list_for_each_entry(addr, &src->address_list, list) { |
133800d1 MRL |
99 | error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a), |
100 | 1, gfp); | |
8e71a11c VY |
101 | if (error < 0) |
102 | break; | |
103 | } | |
104 | ||
105 | return error; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* Initialize the SCTP_bind_addr structure for either an endpoint or |
109 | * an association. | |
110 | */ | |
111 | void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) | |
112 | { | |
1da177e4 LT |
113 | INIT_LIST_HEAD(&bp->address_list); |
114 | bp->port = port; | |
115 | } | |
116 | ||
117 | /* Dispose of the address list. */ | |
118 | static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) | |
119 | { | |
c182f90b | 120 | struct sctp_sockaddr_entry *addr, *temp; |
1da177e4 LT |
121 | |
122 | /* Empty the bind address list. */ | |
c182f90b JL |
123 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { |
124 | list_del_rcu(&addr->list); | |
5d414521 | 125 | kfree_rcu(addr, rcu); |
1da177e4 LT |
126 | SCTP_DBG_OBJCNT_DEC(addr); |
127 | } | |
128 | } | |
129 | ||
130 | /* Dispose of an SCTP_bind_addr structure */ | |
131 | void sctp_bind_addr_free(struct sctp_bind_addr *bp) | |
132 | { | |
133 | /* Empty the bind address list. */ | |
134 | sctp_bind_addr_clean(bp); | |
1da177e4 LT |
135 | } |
136 | ||
137 | /* Add an address to the bind address list in the SCTP_bind_addr structure. */ | |
138 | int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, | |
133800d1 | 139 | int new_size, __u8 addr_state, gfp_t gfp) |
1da177e4 LT |
140 | { |
141 | struct sctp_sockaddr_entry *addr; | |
142 | ||
143 | /* Add the address to the bind address list. */ | |
939cfa75 | 144 | addr = kzalloc(sizeof(*addr), gfp); |
1da177e4 LT |
145 | if (!addr) |
146 | return -ENOMEM; | |
147 | ||
133800d1 | 148 | memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size)); |
1da177e4 LT |
149 | |
150 | /* Fix up the port if it has not yet been set. | |
151 | * Both v4 and v6 have the port at the same offset. | |
152 | */ | |
5ab7b859 AV |
153 | if (!addr->a.v4.sin_port) |
154 | addr->a.v4.sin_port = htons(bp->port); | |
1da177e4 | 155 | |
f57d96b2 | 156 | addr->state = addr_state; |
29303547 | 157 | addr->valid = 1; |
dc022a98 | 158 | |
1da177e4 | 159 | INIT_LIST_HEAD(&addr->list); |
559cf710 VY |
160 | |
161 | /* We always hold a socket lock when calling this function, | |
162 | * and that acts as a writer synchronizing lock. | |
163 | */ | |
164 | list_add_tail_rcu(&addr->list, &bp->address_list); | |
1da177e4 LT |
165 | SCTP_DBG_OBJCNT_INC(addr); |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | /* Delete an address from the bind address list in the SCTP_bind_addr | |
171 | * structure. | |
172 | */ | |
0ed90fb0 | 173 | int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) |
1da177e4 | 174 | { |
559cf710 | 175 | struct sctp_sockaddr_entry *addr, *temp; |
22626216 | 176 | int found = 0; |
1da177e4 | 177 | |
559cf710 VY |
178 | /* We hold the socket lock when calling this function, |
179 | * and that acts as a writer synchronizing lock. | |
180 | */ | |
181 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { | |
c9a08505 | 182 | if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
1da177e4 | 183 | /* Found the exact match. */ |
22626216 | 184 | found = 1; |
559cf710 VY |
185 | addr->valid = 0; |
186 | list_del_rcu(&addr->list); | |
187 | break; | |
1da177e4 LT |
188 | } |
189 | } | |
190 | ||
22626216 | 191 | if (found) { |
1231f0ba | 192 | kfree_rcu(addr, rcu); |
559cf710 | 193 | SCTP_DBG_OBJCNT_DEC(addr); |
0ed90fb0 | 194 | return 0; |
559cf710 VY |
195 | } |
196 | ||
1da177e4 LT |
197 | return -EINVAL; |
198 | } | |
199 | ||
200 | /* Create a network byte-order representation of all the addresses | |
201 | * formated as SCTP parameters. | |
202 | * | |
203 | * The second argument is the return value for the length. | |
204 | */ | |
205 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 206 | int *addrs_len, |
dd0fc66f | 207 | gfp_t gfp) |
1da177e4 LT |
208 | { |
209 | union sctp_params addrparms; | |
210 | union sctp_params retval; | |
211 | int addrparms_len; | |
212 | union sctp_addr_param rawaddr; | |
213 | int len; | |
214 | struct sctp_sockaddr_entry *addr; | |
215 | struct list_head *pos; | |
216 | struct sctp_af *af; | |
217 | ||
218 | addrparms_len = 0; | |
219 | len = 0; | |
220 | ||
221 | /* Allocate enough memory at once. */ | |
222 | list_for_each(pos, &bp->address_list) { | |
223 | len += sizeof(union sctp_addr_param); | |
224 | } | |
225 | ||
226 | /* Don't even bother embedding an address if there | |
227 | * is only one. | |
228 | */ | |
229 | if (len == sizeof(union sctp_addr_param)) { | |
230 | retval.v = NULL; | |
231 | goto end_raw; | |
232 | } | |
233 | ||
234 | retval.v = kmalloc(len, gfp); | |
235 | if (!retval.v) | |
236 | goto end_raw; | |
237 | ||
238 | addrparms = retval; | |
239 | ||
9dbc15f0 | 240 | list_for_each_entry(addr, &bp->address_list, list) { |
6244be4e AV |
241 | af = sctp_get_af_specific(addr->a.v4.sin_family); |
242 | len = af->to_addr_param(&addr->a, &rawaddr); | |
1da177e4 LT |
243 | memcpy(addrparms.v, &rawaddr, len); |
244 | addrparms.v += len; | |
245 | addrparms_len += len; | |
246 | } | |
247 | ||
248 | end_raw: | |
249 | *addrs_len = addrparms_len; | |
250 | return retval; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Create an address list out of the raw address list format (IPv4 and IPv6 | |
255 | * address parameters). | |
256 | */ | |
257 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, | |
dd0fc66f | 258 | int addrs_len, __u16 port, gfp_t gfp) |
1da177e4 LT |
259 | { |
260 | union sctp_addr_param *rawaddr; | |
261 | struct sctp_paramhdr *param; | |
262 | union sctp_addr addr; | |
263 | int retval = 0; | |
264 | int len; | |
265 | struct sctp_af *af; | |
266 | ||
267 | /* Convert the raw address to standard address format */ | |
268 | while (addrs_len) { | |
269 | param = (struct sctp_paramhdr *)raw_addr_list; | |
270 | rawaddr = (union sctp_addr_param *)raw_addr_list; | |
271 | ||
272 | af = sctp_get_af_specific(param_type2af(param->type)); | |
273 | if (unlikely(!af)) { | |
274 | retval = -EINVAL; | |
275 | sctp_bind_addr_clean(bp); | |
276 | break; | |
277 | } | |
278 | ||
dd86d136 | 279 | af->from_addr_param(&addr, rawaddr, htons(port), 0); |
b8607805 XL |
280 | if (sctp_bind_addr_state(bp, &addr) != -1) |
281 | goto next; | |
133800d1 MRL |
282 | retval = sctp_add_bind_addr(bp, &addr, sizeof(addr), |
283 | SCTP_ADDR_SRC, gfp); | |
1da177e4 LT |
284 | if (retval) { |
285 | /* Can't finish building the list, clean up. */ | |
286 | sctp_bind_addr_clean(bp); | |
287 | break; | |
288 | } | |
289 | ||
b8607805 | 290 | next: |
1da177e4 LT |
291 | len = ntohs(param->length); |
292 | addrs_len -= len; | |
293 | raw_addr_list += len; | |
294 | } | |
295 | ||
296 | return retval; | |
297 | } | |
298 | ||
299 | /******************************************************************** | |
300 | * 2nd Level Abstractions | |
301 | ********************************************************************/ | |
302 | ||
303 | /* Does this contain a specified address? Allow wildcarding. */ | |
d808ad9a | 304 | int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
1da177e4 LT |
305 | const union sctp_addr *addr, |
306 | struct sctp_sock *opt) | |
307 | { | |
308 | struct sctp_sockaddr_entry *laddr; | |
559cf710 VY |
309 | int match = 0; |
310 | ||
311 | rcu_read_lock(); | |
312 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
313 | if (!laddr->valid) | |
314 | continue; | |
315 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { | |
316 | match = 1; | |
317 | break; | |
318 | } | |
1da177e4 | 319 | } |
559cf710 | 320 | rcu_read_unlock(); |
1da177e4 | 321 | |
559cf710 | 322 | return match; |
1da177e4 LT |
323 | } |
324 | ||
76c6d988 XL |
325 | int sctp_bind_addrs_check(struct sctp_sock *sp, |
326 | struct sctp_sock *sp2, int cnt2) | |
327 | { | |
328 | struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr; | |
329 | struct sctp_bind_addr *bp = &sp->ep->base.bind_addr; | |
330 | struct sctp_sockaddr_entry *laddr, *laddr2; | |
331 | bool exist = false; | |
332 | int cnt = 0; | |
333 | ||
334 | rcu_read_lock(); | |
335 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
336 | list_for_each_entry_rcu(laddr2, &bp2->address_list, list) { | |
337 | if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) && | |
338 | laddr->valid && laddr2->valid) { | |
339 | exist = true; | |
340 | goto next; | |
341 | } | |
342 | } | |
343 | cnt = 0; | |
344 | break; | |
345 | next: | |
346 | cnt++; | |
347 | } | |
348 | rcu_read_unlock(); | |
349 | ||
350 | return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1); | |
351 | } | |
352 | ||
7dab83de VY |
353 | /* Does the address 'addr' conflict with any addresses in |
354 | * the bp. | |
355 | */ | |
356 | int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, | |
357 | const union sctp_addr *addr, | |
358 | struct sctp_sock *bp_sp, | |
359 | struct sctp_sock *addr_sp) | |
360 | { | |
361 | struct sctp_sockaddr_entry *laddr; | |
362 | int conflict = 0; | |
363 | struct sctp_sock *sp; | |
364 | ||
365 | /* Pick the IPv6 socket as the basis of comparison | |
366 | * since it's usually a superset of the IPv4. | |
367 | * If there is no IPv6 socket, then default to bind_addr. | |
368 | */ | |
369 | if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) | |
370 | sp = bp_sp; | |
371 | else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) | |
372 | sp = addr_sp; | |
373 | else | |
374 | sp = bp_sp; | |
375 | ||
376 | rcu_read_lock(); | |
377 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
378 | if (!laddr->valid) | |
379 | continue; | |
380 | ||
381 | conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); | |
382 | if (conflict) | |
383 | break; | |
384 | } | |
385 | rcu_read_unlock(); | |
386 | ||
387 | return conflict; | |
388 | } | |
389 | ||
75205f47 VY |
390 | /* Get the state of the entry in the bind_addr_list */ |
391 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, | |
392 | const union sctp_addr *addr) | |
393 | { | |
394 | struct sctp_sockaddr_entry *laddr; | |
395 | struct sctp_af *af; | |
396 | int state = -1; | |
397 | ||
398 | af = sctp_get_af_specific(addr->sa.sa_family); | |
399 | if (unlikely(!af)) | |
400 | return state; | |
401 | ||
402 | rcu_read_lock(); | |
403 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
404 | if (!laddr->valid) | |
405 | continue; | |
406 | if (af->cmp_addr(&laddr->a, addr)) { | |
407 | state = laddr->state; | |
408 | break; | |
409 | } | |
410 | } | |
411 | rcu_read_unlock(); | |
412 | ||
413 | return state; | |
414 | } | |
415 | ||
1da177e4 LT |
416 | /* Find the first address in the bind address list that is not present in |
417 | * the addrs packed array. | |
418 | */ | |
419 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
420 | const union sctp_addr *addrs, | |
421 | int addrcnt, | |
422 | struct sctp_sock *opt) | |
423 | { | |
424 | struct sctp_sockaddr_entry *laddr; | |
425 | union sctp_addr *addr; | |
426 | void *addr_buf; | |
427 | struct sctp_af *af; | |
1da177e4 LT |
428 | int i; |
429 | ||
559cf710 VY |
430 | /* This is only called sctp_send_asconf_del_ip() and we hold |
431 | * the socket lock in that code patch, so that address list | |
432 | * can't change. | |
433 | */ | |
434 | list_for_each_entry(laddr, &bp->address_list, list) { | |
1da177e4 LT |
435 | addr_buf = (union sctp_addr *)addrs; |
436 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 437 | addr = addr_buf; |
1da177e4 | 438 | af = sctp_get_af_specific(addr->v4.sin_family); |
d808ad9a | 439 | if (!af) |
559cf710 | 440 | break; |
1da177e4 | 441 | |
5f242a13 | 442 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
1da177e4 LT |
443 | break; |
444 | ||
445 | addr_buf += af->sockaddr_len; | |
446 | } | |
447 | if (i == addrcnt) | |
5ae955cf | 448 | return &laddr->a; |
1da177e4 LT |
449 | } |
450 | ||
451 | return NULL; | |
452 | } | |
453 | ||
454 | /* Copy out addresses from the global local address list. */ | |
4db67e80 | 455 | static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, |
1c662018 XL |
456 | union sctp_addr *addr, enum sctp_scope scope, |
457 | gfp_t gfp, int flags) | |
1da177e4 LT |
458 | { |
459 | int error = 0; | |
460 | ||
52cae8f0 | 461 | if (sctp_is_any(NULL, addr)) { |
4db67e80 | 462 | error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags); |
e7ff4a70 | 463 | } else if (sctp_in_scope(net, addr, scope)) { |
1da177e4 LT |
464 | /* Now that the address is in scope, check to see if |
465 | * the address type is supported by local sock as | |
466 | * well as the remote peer. | |
467 | */ | |
468 | if ((((AF_INET == addr->sa.sa_family) && | |
469 | (flags & SCTP_ADDR4_PEERSUPP))) || | |
470 | (((AF_INET6 == addr->sa.sa_family) && | |
471 | (flags & SCTP_ADDR6_ALLOWED) && | |
472 | (flags & SCTP_ADDR6_PEERSUPP)))) | |
133800d1 MRL |
473 | error = sctp_add_bind_addr(dest, addr, sizeof(*addr), |
474 | SCTP_ADDR_SRC, gfp); | |
1da177e4 LT |
475 | } |
476 | ||
477 | return error; | |
478 | } | |
479 | ||
480 | /* Is this a wildcard address? */ | |
52cae8f0 | 481 | int sctp_is_any(struct sock *sk, const union sctp_addr *addr) |
1da177e4 | 482 | { |
52cae8f0 VY |
483 | unsigned short fam = 0; |
484 | struct sctp_af *af; | |
485 | ||
486 | /* Try to get the right address family */ | |
487 | if (addr->sa.sa_family != AF_UNSPEC) | |
488 | fam = addr->sa.sa_family; | |
489 | else if (sk) | |
490 | fam = sk->sk_family; | |
491 | ||
492 | af = sctp_get_af_specific(fam); | |
1da177e4 LT |
493 | if (!af) |
494 | return 0; | |
52cae8f0 | 495 | |
1da177e4 LT |
496 | return af->is_any(addr); |
497 | } | |
498 | ||
499 | /* Is 'addr' valid for 'scope'? */ | |
1c662018 XL |
500 | int sctp_in_scope(struct net *net, const union sctp_addr *addr, |
501 | enum sctp_scope scope) | |
1da177e4 | 502 | { |
1c662018 | 503 | enum sctp_scope addr_scope = sctp_scope(addr); |
1da177e4 LT |
504 | |
505 | /* The unusable SCTP addresses will not be considered with | |
506 | * any defined scopes. | |
507 | */ | |
508 | if (SCTP_SCOPE_UNUSABLE == addr_scope) | |
509 | return 0; | |
510 | /* | |
511 | * For INIT and INIT-ACK address list, let L be the level of | |
512 | * of requested destination address, sender and receiver | |
513 | * SHOULD include all of its addresses with level greater | |
514 | * than or equal to L. | |
72388433 BD |
515 | * |
516 | * Address scoping can be selectively controlled via sysctl | |
517 | * option | |
1da177e4 | 518 | */ |
e1fc3b14 | 519 | switch (net->sctp.scope_policy) { |
72388433 | 520 | case SCTP_SCOPE_POLICY_DISABLE: |
1da177e4 | 521 | return 1; |
72388433 BD |
522 | case SCTP_SCOPE_POLICY_ENABLE: |
523 | if (addr_scope <= scope) | |
524 | return 1; | |
525 | break; | |
526 | case SCTP_SCOPE_POLICY_PRIVATE: | |
527 | if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) | |
528 | return 1; | |
529 | break; | |
530 | case SCTP_SCOPE_POLICY_LINK: | |
531 | if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) | |
532 | return 1; | |
533 | break; | |
534 | default: | |
535 | break; | |
536 | } | |
1da177e4 LT |
537 | |
538 | return 0; | |
539 | } | |
540 | ||
9f7d653b MH |
541 | int sctp_is_ep_boundall(struct sock *sk) |
542 | { | |
543 | struct sctp_bind_addr *bp; | |
544 | struct sctp_sockaddr_entry *addr; | |
545 | ||
546 | bp = &sctp_sk(sk)->ep->base.bind_addr; | |
547 | if (sctp_list_single_entry(&bp->address_list)) { | |
548 | addr = list_entry(bp->address_list.next, | |
549 | struct sctp_sockaddr_entry, list); | |
550 | if (sctp_is_any(sk, &addr->a)) | |
551 | return 1; | |
552 | } | |
553 | return 0; | |
554 | } | |
555 | ||
1da177e4 LT |
556 | /******************************************************************** |
557 | * 3rd Level Abstractions | |
558 | ********************************************************************/ | |
559 | ||
560 | /* What is the scope of 'addr'? */ | |
1c662018 | 561 | enum sctp_scope sctp_scope(const union sctp_addr *addr) |
1da177e4 LT |
562 | { |
563 | struct sctp_af *af; | |
564 | ||
565 | af = sctp_get_af_specific(addr->sa.sa_family); | |
566 | if (!af) | |
567 | return SCTP_SCOPE_UNUSABLE; | |
568 | ||
569 | return af->scope((union sctp_addr *)addr); | |
570 | } |