blob: 4ece451c8d27d59ba2a73fba1baf6cb8ca19fe4e [file] [log] [blame]
Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * A collection class to handle the storage of transport addresses.
10 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050017 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#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. */
55static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
Al Virodd0fc662005-10-07 07:46:04 +010056 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070057 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static 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 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090065int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 const struct sctp_bind_addr *src,
Al Virodd0fc662005-10-07 07:46:04 +010067 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070068 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 struct sctp_sockaddr_entry *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 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. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -070077 list_for_each_entry(addr, &src->address_list, list) {
Al Viro02a8a4d2006-11-20 17:12:07 -080078 error = sctp_copy_one_addr(dest, &addr->a, scope,
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 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)) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -070089 list_for_each_entry(addr, &src->address_list, list) {
Al Viro02a8a4d2006-11-20 17:12:07 -080090 error = sctp_copy_one_addr(dest, &addr->a,
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 SCTP_SCOPE_LINK, gfp,
92 flags);
93 if (error < 0)
94 goto out;
95 }
96 }
97
98out:
99 if (error)
100 sctp_bind_addr_clean(dest);
101
102 return error;
103}
104
Vlad Yasevich8e71a112007-12-06 22:50:54 -0800105/* 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 */
110int 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;
Vlad Yasevich8e71a112007-12-06 22:50:54 -0800115 int error = 0;
116
117 /* All addresses share the same port. */
118 dest->port = src->port;
119
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700120 list_for_each_entry(addr, &src->address_list, list) {
Vlad Yasevich8e71a112007-12-06 22:50:54 -0800121 error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
122 if (error < 0)
123 break;
124 }
125
126 return error;
127}
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129/* Initialize the SCTP_bind_addr structure for either an endpoint or
130 * an association.
131 */
132void 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. */
141static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
142{
Jacek Luczakc182f902011-05-19 09:55:13 +0000143 struct sctp_sockaddr_entry *addr, *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 /* Empty the bind address list. */
Jacek Luczakc182f902011-05-19 09:55:13 +0000146 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
147 list_del_rcu(&addr->list);
David S. Miller5d414522011-05-21 02:10:23 -0400148 kfree_rcu(addr, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 SCTP_DBG_OBJCNT_DEC(addr);
150 }
151}
152
153/* Dispose of an SCTP_bind_addr structure */
154void 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. */
166int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800167 __u8 addr_state, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
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
Al Viro5ab7b852006-11-20 17:10:38 -0800176 memcpy(&addr->a, new, sizeof(*new));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
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 */
Al Viro5ab7b852006-11-20 17:10:38 -0800181 if (!addr->a.v4.sin_port)
182 addr->a.v4.sin_port = htons(bp->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800184 addr->state = addr_state;
Vlad Yasevich29303542007-09-16 16:02:12 -0700185 addr->valid = 1;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 INIT_LIST_HEAD(&addr->list);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700188
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 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 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400201int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Vlad Yasevich559cf712007-09-16 16:03:28 -0700203 struct sctp_sockaddr_entry *addr, *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700204 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Vlad Yasevich559cf712007-09-16 16:03:28 -0700206 /* 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) {
Al Viroc9a08502006-11-20 17:07:48 -0800210 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* Found the exact match. */
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700212 found = 1;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700213 addr->valid = 0;
214 list_del_rcu(&addr->list);
215 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217 }
218
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700219 if (found) {
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800220 kfree_rcu(addr, rcu);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700221 SCTP_DBG_OBJCNT_DEC(addr);
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400222 return 0;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700223 }
224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 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 */
233union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700234 int *addrs_len,
Al Virodd0fc662005-10-07 07:46:04 +0100235 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
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
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700268 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -0800269 af = sctp_get_af_specific(addr->a.v4.sin_family);
270 len = af->to_addr_param(&addr->a, &rawaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 memcpy(addrparms.v, &rawaddr, len);
272 addrparms.v += len;
273 addrparms_len += len;
274 }
275
276end_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 */
285int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
Al Virodd0fc662005-10-07 07:46:04 +0100286 int addrs_len, __u16 port, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
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
Al Virodd86d132006-11-20 17:11:13 -0800307 af->from_addr_param(&addr, rawaddr, htons(port), 0);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800308 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 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. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900328int sctp_bind_addr_match(struct sctp_bind_addr *bp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 const union sctp_addr *addr,
330 struct sctp_sock *opt)
331{
332 struct sctp_sockaddr_entry *laddr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700333 int match = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Vlad Yasevich559cf712007-09-16 16:03:28 -0700335 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
Vlad Yasevich559cf712007-09-16 16:03:28 -0700344 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Vlad Yasevich559cf712007-09-16 16:03:28 -0700346 return match;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
348
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700349/* Does the address 'addr' conflict with any addresses in
350 * the bp.
351 */
352int 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
Vlad Yasevich75205f42007-12-20 14:12:59 -0800386/* Get the state of the entry in the bind_addr_list */
387int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412/* Find the first address in the bind address list that is not present in
413 * the addrs packed array.
414 */
415union 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 int i;
425
Vlad Yasevich559cf712007-09-16 16:03:28 -0700426 /* 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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 addr_buf = (union sctp_addr *)addrs;
432 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000433 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 af = sctp_get_af_specific(addr->v4.sin_family);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900435 if (!af)
Vlad Yasevich559cf712007-09-16 16:03:28 -0700436 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Al Viro5f242a12006-11-20 17:05:23 -0800438 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 break;
440
441 addr_buf += af->sockaddr_len;
442 }
443 if (i == addrcnt)
Al Viro5ae955c2006-11-20 17:22:08 -0800444 return &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 }
446
447 return NULL;
448}
449
450/* Copy out addresses from the global local address list. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900451static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 union sctp_addr *addr,
Al Virodd0fc662005-10-07 07:46:04 +0100453 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700454 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
456 int error = 0;
457
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400458 if (sctp_is_any(NULL, addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 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))))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800470 error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
471 gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 }
473
474 return error;
475}
476
477/* Is this a wildcard address? */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400478int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400480 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 if (!af)
491 return 0;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return af->is_any(addr);
494}
495
496/* Is 'addr' valid for 'scope'? */
497int 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.
Bhaskar Dutta72388432009-09-03 17:25:47 +0530511 *
512 * Address scoping can be selectively controlled via sysctl
513 * option
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 */
Bhaskar Dutta72388432009-09-03 17:25:47 +0530515 switch (sctp_scope_policy) {
516 case SCTP_SCOPE_POLICY_DISABLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return 1;
Bhaskar Dutta72388432009-09-03 17:25:47 +0530518 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 return 0;
535}
536
Michio Honda9f7d6532011-04-26 19:32:51 +0900537int sctp_is_ep_boundall(struct sock *sk)
538{
539 struct sctp_bind_addr *bp;
540 struct sctp_sockaddr_entry *addr;
541
542 bp = &sctp_sk(sk)->ep->base.bind_addr;
543 if (sctp_list_single_entry(&bp->address_list)) {
544 addr = list_entry(bp->address_list.next,
545 struct sctp_sockaddr_entry, list);
546 if (sctp_is_any(sk, &addr->a))
547 return 1;
548 }
549 return 0;
550}
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552/********************************************************************
553 * 3rd Level Abstractions
554 ********************************************************************/
555
556/* What is the scope of 'addr'? */
557sctp_scope_t sctp_scope(const union sctp_addr *addr)
558{
559 struct sctp_af *af;
560
561 af = sctp_get_af_specific(addr->sa.sa_family);
562 if (!af)
563 return SCTP_SCOPE_UNUSABLE;
564
565 return af->scope((union sctp_addr *)addr);
566}