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1/* SCTP kernel implementation
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 *
7 * This file is part of the SCTP kernel implementation.
8 *
9 * A collection class to handle the storage of transport addresses.
10 *
11 * This SCTP implementation is free software;
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 *
17 * This SCTP implementation is distributed in the hope that it
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>
46#include <linux/slab.h>
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. */
55static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
56 sctp_scope_t scope, gfp_t gfp,
57 int flags);
58static 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 */
65int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
66 const struct sctp_bind_addr *src,
67 sctp_scope_t scope, gfp_t gfp,
68 int flags)
69{
70 struct sctp_sockaddr_entry *addr;
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_entry(addr, &src->address_list, list) {
78 error = sctp_copy_one_addr(dest, &addr->a, scope,
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)) {
89 list_for_each_entry(addr, &src->address_list, list) {
90 error = sctp_copy_one_addr(dest, &addr->a,
91 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
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 */
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;
115 int error = 0;
116
117 /* All addresses share the same port. */
118 dest->port = src->port;
119
120 list_for_each_entry(addr, &src->address_list, list) {
121 error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
122 if (error < 0)
123 break;
124 }
125
126 return error;
127}
128
129/* 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{
143 struct sctp_sockaddr_entry *addr, *temp;
144
145 /* Empty the bind address list. */
146 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
147 list_del_rcu(&addr->list);
148 kfree_rcu(addr, rcu);
149 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,
167 __u8 addr_state, gfp_t gfp)
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
176 memcpy(&addr->a, new, sizeof(*new));
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 */
181 if (!addr->a.v4.sin_port)
182 addr->a.v4.sin_port = htons(bp->port);
183
184 addr->state = addr_state;
185 addr->valid = 1;
186
187 INIT_LIST_HEAD(&addr->list);
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);
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 */
201int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
202{
203 struct sctp_sockaddr_entry *addr, *temp;
204 int found = 0;
205
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) {
210 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
211 /* Found the exact match. */
212 found = 1;
213 addr->valid = 0;
214 list_del_rcu(&addr->list);
215 break;
216 }
217 }
218
219 if (found) {
220 kfree_rcu(addr, rcu);
221 SCTP_DBG_OBJCNT_DEC(addr);
222 return 0;
223 }
224
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 */
233union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
234 int *addrs_len,
235 gfp_t gfp)
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
268 list_for_each_entry(addr, &bp->address_list, list) {
269 af = sctp_get_af_specific(addr->a.v4.sin_family);
270 len = af->to_addr_param(&addr->a, &rawaddr);
271 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,
286 int addrs_len, __u16 port, gfp_t gfp)
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
307 af->from_addr_param(&addr, rawaddr, htons(port), 0);
308 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
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. */
328int sctp_bind_addr_match(struct sctp_bind_addr *bp,
329 const union sctp_addr *addr,
330 struct sctp_sock *opt)
331{
332 struct sctp_sockaddr_entry *laddr;
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 }
343 }
344 rcu_read_unlock();
345
346 return match;
347}
348
349/* 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
386/* 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
412/* 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;
424 int i;
425
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) {
431 addr_buf = (union sctp_addr *)addrs;
432 for (i = 0; i < addrcnt; i++) {
433 addr = addr_buf;
434 af = sctp_get_af_specific(addr->v4.sin_family);
435 if (!af)
436 break;
437
438 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
439 break;
440
441 addr_buf += af->sockaddr_len;
442 }
443 if (i == addrcnt)
444 return &laddr->a;
445 }
446
447 return NULL;
448}
449
450/* Copy out addresses from the global local address list. */
451static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
452 union sctp_addr *addr,
453 sctp_scope_t scope, gfp_t gfp,
454 int flags)
455{
456 int error = 0;
457
458 if (sctp_is_any(NULL, addr)) {
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))))
470 error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
471 gfp);
472 }
473
474 return error;
475}
476
477/* Is this a wildcard address? */
478int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
479{
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);
490 if (!af)
491 return 0;
492
493 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.
511 *
512 * Address scoping can be selectively controlled via sysctl
513 * option
514 */
515 switch (sctp_scope_policy) {
516 case SCTP_SCOPE_POLICY_DISABLE:
517 return 1;
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 }
533
534 return 0;
535}
536
537int 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
552/********************************************************************
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}
1/* SCTP kernel implementation
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 *
7 * This file is part of the SCTP kernel implementation.
8 *
9 * A collection class to handle the storage of transport addresses.
10 *
11 * This SCTP implementation is free software;
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 *
17 * This SCTP implementation is distributed in the hope that it
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, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
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>
36 */
37
38#include <linux/types.h>
39#include <linux/slab.h>
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. */
48static int sctp_copy_one_addr(struct net *, struct sctp_bind_addr *,
49 union sctp_addr *, sctp_scope_t scope, gfp_t gfp,
50 int flags);
51static 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 */
58int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
59 const struct sctp_bind_addr *src,
60 sctp_scope_t scope, gfp_t gfp,
61 int flags)
62{
63 struct sctp_sockaddr_entry *addr;
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. */
70 list_for_each_entry(addr, &src->address_list, list) {
71 error = sctp_copy_one_addr(net, dest, &addr->a, scope,
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)) {
82 list_for_each_entry(addr, &src->address_list, list) {
83 error = sctp_copy_one_addr(net, dest, &addr->a,
84 SCTP_SCOPE_LINK, gfp,
85 flags);
86 if (error < 0)
87 goto out;
88 }
89 }
90
91out:
92 if (error)
93 sctp_bind_addr_clean(dest);
94
95 return error;
96}
97
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 */
103int 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;
108 int error = 0;
109
110 /* All addresses share the same port. */
111 dest->port = src->port;
112
113 list_for_each_entry(addr, &src->address_list, list) {
114 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
115 1, gfp);
116 if (error < 0)
117 break;
118 }
119
120 return error;
121}
122
123/* Initialize the SCTP_bind_addr structure for either an endpoint or
124 * an association.
125 */
126void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
127{
128 INIT_LIST_HEAD(&bp->address_list);
129 bp->port = port;
130}
131
132/* Dispose of the address list. */
133static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
134{
135 struct sctp_sockaddr_entry *addr, *temp;
136
137 /* Empty the bind address list. */
138 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
139 list_del_rcu(&addr->list);
140 kfree_rcu(addr, rcu);
141 SCTP_DBG_OBJCNT_DEC(addr);
142 }
143}
144
145/* Dispose of an SCTP_bind_addr structure */
146void sctp_bind_addr_free(struct sctp_bind_addr *bp)
147{
148 /* Empty the bind address list. */
149 sctp_bind_addr_clean(bp);
150}
151
152/* Add an address to the bind address list in the SCTP_bind_addr structure. */
153int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
154 int new_size, __u8 addr_state, gfp_t gfp)
155{
156 struct sctp_sockaddr_entry *addr;
157
158 /* Add the address to the bind address list. */
159 addr = kzalloc(sizeof(*addr), gfp);
160 if (!addr)
161 return -ENOMEM;
162
163 memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
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 */
168 if (!addr->a.v4.sin_port)
169 addr->a.v4.sin_port = htons(bp->port);
170
171 addr->state = addr_state;
172 addr->valid = 1;
173
174 INIT_LIST_HEAD(&addr->list);
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);
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 */
188int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
189{
190 struct sctp_sockaddr_entry *addr, *temp;
191 int found = 0;
192
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) {
197 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
198 /* Found the exact match. */
199 found = 1;
200 addr->valid = 0;
201 list_del_rcu(&addr->list);
202 break;
203 }
204 }
205
206 if (found) {
207 kfree_rcu(addr, rcu);
208 SCTP_DBG_OBJCNT_DEC(addr);
209 return 0;
210 }
211
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 */
220union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
221 int *addrs_len,
222 gfp_t gfp)
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
255 list_for_each_entry(addr, &bp->address_list, list) {
256 af = sctp_get_af_specific(addr->a.v4.sin_family);
257 len = af->to_addr_param(&addr->a, &rawaddr);
258 memcpy(addrparms.v, &rawaddr, len);
259 addrparms.v += len;
260 addrparms_len += len;
261 }
262
263end_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 */
272int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
273 int addrs_len, __u16 port, gfp_t gfp)
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
294 af->from_addr_param(&addr, rawaddr, htons(port), 0);
295 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
296 SCTP_ADDR_SRC, gfp);
297 if (retval) {
298 /* Can't finish building the list, clean up. */
299 sctp_bind_addr_clean(bp);
300 break;
301 }
302
303 len = ntohs(param->length);
304 addrs_len -= len;
305 raw_addr_list += len;
306 }
307
308 return retval;
309}
310
311/********************************************************************
312 * 2nd Level Abstractions
313 ********************************************************************/
314
315/* Does this contain a specified address? Allow wildcarding. */
316int sctp_bind_addr_match(struct sctp_bind_addr *bp,
317 const union sctp_addr *addr,
318 struct sctp_sock *opt)
319{
320 struct sctp_sockaddr_entry *laddr;
321 int match = 0;
322
323 rcu_read_lock();
324 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
325 if (!laddr->valid)
326 continue;
327 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
328 match = 1;
329 break;
330 }
331 }
332 rcu_read_unlock();
333
334 return match;
335}
336
337/* Does the address 'addr' conflict with any addresses in
338 * the bp.
339 */
340int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
341 const union sctp_addr *addr,
342 struct sctp_sock *bp_sp,
343 struct sctp_sock *addr_sp)
344{
345 struct sctp_sockaddr_entry *laddr;
346 int conflict = 0;
347 struct sctp_sock *sp;
348
349 /* Pick the IPv6 socket as the basis of comparison
350 * since it's usually a superset of the IPv4.
351 * If there is no IPv6 socket, then default to bind_addr.
352 */
353 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
354 sp = bp_sp;
355 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
356 sp = addr_sp;
357 else
358 sp = bp_sp;
359
360 rcu_read_lock();
361 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
362 if (!laddr->valid)
363 continue;
364
365 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
366 if (conflict)
367 break;
368 }
369 rcu_read_unlock();
370
371 return conflict;
372}
373
374/* Get the state of the entry in the bind_addr_list */
375int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
376 const union sctp_addr *addr)
377{
378 struct sctp_sockaddr_entry *laddr;
379 struct sctp_af *af;
380 int state = -1;
381
382 af = sctp_get_af_specific(addr->sa.sa_family);
383 if (unlikely(!af))
384 return state;
385
386 rcu_read_lock();
387 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
388 if (!laddr->valid)
389 continue;
390 if (af->cmp_addr(&laddr->a, addr)) {
391 state = laddr->state;
392 break;
393 }
394 }
395 rcu_read_unlock();
396
397 return state;
398}
399
400/* Find the first address in the bind address list that is not present in
401 * the addrs packed array.
402 */
403union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
404 const union sctp_addr *addrs,
405 int addrcnt,
406 struct sctp_sock *opt)
407{
408 struct sctp_sockaddr_entry *laddr;
409 union sctp_addr *addr;
410 void *addr_buf;
411 struct sctp_af *af;
412 int i;
413
414 /* This is only called sctp_send_asconf_del_ip() and we hold
415 * the socket lock in that code patch, so that address list
416 * can't change.
417 */
418 list_for_each_entry(laddr, &bp->address_list, list) {
419 addr_buf = (union sctp_addr *)addrs;
420 for (i = 0; i < addrcnt; i++) {
421 addr = addr_buf;
422 af = sctp_get_af_specific(addr->v4.sin_family);
423 if (!af)
424 break;
425
426 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
427 break;
428
429 addr_buf += af->sockaddr_len;
430 }
431 if (i == addrcnt)
432 return &laddr->a;
433 }
434
435 return NULL;
436}
437
438/* Copy out addresses from the global local address list. */
439static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
440 union sctp_addr *addr,
441 sctp_scope_t scope, gfp_t gfp,
442 int flags)
443{
444 int error = 0;
445
446 if (sctp_is_any(NULL, addr)) {
447 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
448 } else if (sctp_in_scope(net, addr, scope)) {
449 /* Now that the address is in scope, check to see if
450 * the address type is supported by local sock as
451 * well as the remote peer.
452 */
453 if ((((AF_INET == addr->sa.sa_family) &&
454 (flags & SCTP_ADDR4_PEERSUPP))) ||
455 (((AF_INET6 == addr->sa.sa_family) &&
456 (flags & SCTP_ADDR6_ALLOWED) &&
457 (flags & SCTP_ADDR6_PEERSUPP))))
458 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
459 SCTP_ADDR_SRC, gfp);
460 }
461
462 return error;
463}
464
465/* Is this a wildcard address? */
466int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
467{
468 unsigned short fam = 0;
469 struct sctp_af *af;
470
471 /* Try to get the right address family */
472 if (addr->sa.sa_family != AF_UNSPEC)
473 fam = addr->sa.sa_family;
474 else if (sk)
475 fam = sk->sk_family;
476
477 af = sctp_get_af_specific(fam);
478 if (!af)
479 return 0;
480
481 return af->is_any(addr);
482}
483
484/* Is 'addr' valid for 'scope'? */
485int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope)
486{
487 sctp_scope_t addr_scope = sctp_scope(addr);
488
489 /* The unusable SCTP addresses will not be considered with
490 * any defined scopes.
491 */
492 if (SCTP_SCOPE_UNUSABLE == addr_scope)
493 return 0;
494 /*
495 * For INIT and INIT-ACK address list, let L be the level of
496 * of requested destination address, sender and receiver
497 * SHOULD include all of its addresses with level greater
498 * than or equal to L.
499 *
500 * Address scoping can be selectively controlled via sysctl
501 * option
502 */
503 switch (net->sctp.scope_policy) {
504 case SCTP_SCOPE_POLICY_DISABLE:
505 return 1;
506 case SCTP_SCOPE_POLICY_ENABLE:
507 if (addr_scope <= scope)
508 return 1;
509 break;
510 case SCTP_SCOPE_POLICY_PRIVATE:
511 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
512 return 1;
513 break;
514 case SCTP_SCOPE_POLICY_LINK:
515 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
516 return 1;
517 break;
518 default:
519 break;
520 }
521
522 return 0;
523}
524
525int sctp_is_ep_boundall(struct sock *sk)
526{
527 struct sctp_bind_addr *bp;
528 struct sctp_sockaddr_entry *addr;
529
530 bp = &sctp_sk(sk)->ep->base.bind_addr;
531 if (sctp_list_single_entry(&bp->address_list)) {
532 addr = list_entry(bp->address_list.next,
533 struct sctp_sockaddr_entry, list);
534 if (sctp_is_any(sk, &addr->a))
535 return 1;
536 }
537 return 0;
538}
539
540/********************************************************************
541 * 3rd Level Abstractions
542 ********************************************************************/
543
544/* What is the scope of 'addr'? */
545sctp_scope_t sctp_scope(const union sctp_addr *addr)
546{
547 struct sctp_af *af;
548
549 af = sctp_get_af_specific(addr->sa.sa_family);
550 if (!af)
551 return SCTP_SCOPE_UNUSABLE;
552
553 return af->scope((union sctp_addr *)addr);
554}