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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, 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, 1, gfp);
115 if (error < 0)
116 break;
117 }
118
119 return error;
120}
121
122/* Initialize the SCTP_bind_addr structure for either an endpoint or
123 * an association.
124 */
125void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
126{
127 INIT_LIST_HEAD(&bp->address_list);
128 bp->port = port;
129}
130
131/* Dispose of the address list. */
132static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
133{
134 struct sctp_sockaddr_entry *addr, *temp;
135
136 /* Empty the bind address list. */
137 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
138 list_del_rcu(&addr->list);
139 kfree_rcu(addr, rcu);
140 SCTP_DBG_OBJCNT_DEC(addr);
141 }
142}
143
144/* Dispose of an SCTP_bind_addr structure */
145void sctp_bind_addr_free(struct sctp_bind_addr *bp)
146{
147 /* Empty the bind address list. */
148 sctp_bind_addr_clean(bp);
149}
150
151/* Add an address to the bind address list in the SCTP_bind_addr structure. */
152int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
153 __u8 addr_state, gfp_t gfp)
154{
155 struct sctp_sockaddr_entry *addr;
156
157 /* Add the address to the bind address list. */
158 addr = kzalloc(sizeof(*addr), gfp);
159 if (!addr)
160 return -ENOMEM;
161
162 memcpy(&addr->a, new, sizeof(*new));
163
164 /* Fix up the port if it has not yet been set.
165 * Both v4 and v6 have the port at the same offset.
166 */
167 if (!addr->a.v4.sin_port)
168 addr->a.v4.sin_port = htons(bp->port);
169
170 addr->state = addr_state;
171 addr->valid = 1;
172
173 INIT_LIST_HEAD(&addr->list);
174
175 /* We always hold a socket lock when calling this function,
176 * and that acts as a writer synchronizing lock.
177 */
178 list_add_tail_rcu(&addr->list, &bp->address_list);
179 SCTP_DBG_OBJCNT_INC(addr);
180
181 return 0;
182}
183
184/* Delete an address from the bind address list in the SCTP_bind_addr
185 * structure.
186 */
187int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
188{
189 struct sctp_sockaddr_entry *addr, *temp;
190 int found = 0;
191
192 /* We hold the socket lock when calling this function,
193 * and that acts as a writer synchronizing lock.
194 */
195 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
196 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
197 /* Found the exact match. */
198 found = 1;
199 addr->valid = 0;
200 list_del_rcu(&addr->list);
201 break;
202 }
203 }
204
205 if (found) {
206 kfree_rcu(addr, rcu);
207 SCTP_DBG_OBJCNT_DEC(addr);
208 return 0;
209 }
210
211 return -EINVAL;
212}
213
214/* Create a network byte-order representation of all the addresses
215 * formated as SCTP parameters.
216 *
217 * The second argument is the return value for the length.
218 */
219union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
220 int *addrs_len,
221 gfp_t gfp)
222{
223 union sctp_params addrparms;
224 union sctp_params retval;
225 int addrparms_len;
226 union sctp_addr_param rawaddr;
227 int len;
228 struct sctp_sockaddr_entry *addr;
229 struct list_head *pos;
230 struct sctp_af *af;
231
232 addrparms_len = 0;
233 len = 0;
234
235 /* Allocate enough memory at once. */
236 list_for_each(pos, &bp->address_list) {
237 len += sizeof(union sctp_addr_param);
238 }
239
240 /* Don't even bother embedding an address if there
241 * is only one.
242 */
243 if (len == sizeof(union sctp_addr_param)) {
244 retval.v = NULL;
245 goto end_raw;
246 }
247
248 retval.v = kmalloc(len, gfp);
249 if (!retval.v)
250 goto end_raw;
251
252 addrparms = retval;
253
254 list_for_each_entry(addr, &bp->address_list, list) {
255 af = sctp_get_af_specific(addr->a.v4.sin_family);
256 len = af->to_addr_param(&addr->a, &rawaddr);
257 memcpy(addrparms.v, &rawaddr, len);
258 addrparms.v += len;
259 addrparms_len += len;
260 }
261
262end_raw:
263 *addrs_len = addrparms_len;
264 return retval;
265}
266
267/*
268 * Create an address list out of the raw address list format (IPv4 and IPv6
269 * address parameters).
270 */
271int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
272 int addrs_len, __u16 port, gfp_t gfp)
273{
274 union sctp_addr_param *rawaddr;
275 struct sctp_paramhdr *param;
276 union sctp_addr addr;
277 int retval = 0;
278 int len;
279 struct sctp_af *af;
280
281 /* Convert the raw address to standard address format */
282 while (addrs_len) {
283 param = (struct sctp_paramhdr *)raw_addr_list;
284 rawaddr = (union sctp_addr_param *)raw_addr_list;
285
286 af = sctp_get_af_specific(param_type2af(param->type));
287 if (unlikely(!af)) {
288 retval = -EINVAL;
289 sctp_bind_addr_clean(bp);
290 break;
291 }
292
293 af->from_addr_param(&addr, rawaddr, htons(port), 0);
294 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
295 if (retval) {
296 /* Can't finish building the list, clean up. */
297 sctp_bind_addr_clean(bp);
298 break;
299 }
300
301 len = ntohs(param->length);
302 addrs_len -= len;
303 raw_addr_list += len;
304 }
305
306 return retval;
307}
308
309/********************************************************************
310 * 2nd Level Abstractions
311 ********************************************************************/
312
313/* Does this contain a specified address? Allow wildcarding. */
314int sctp_bind_addr_match(struct sctp_bind_addr *bp,
315 const union sctp_addr *addr,
316 struct sctp_sock *opt)
317{
318 struct sctp_sockaddr_entry *laddr;
319 int match = 0;
320
321 rcu_read_lock();
322 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
323 if (!laddr->valid)
324 continue;
325 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
326 match = 1;
327 break;
328 }
329 }
330 rcu_read_unlock();
331
332 return match;
333}
334
335/* Does the address 'addr' conflict with any addresses in
336 * the bp.
337 */
338int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
339 const union sctp_addr *addr,
340 struct sctp_sock *bp_sp,
341 struct sctp_sock *addr_sp)
342{
343 struct sctp_sockaddr_entry *laddr;
344 int conflict = 0;
345 struct sctp_sock *sp;
346
347 /* Pick the IPv6 socket as the basis of comparison
348 * since it's usually a superset of the IPv4.
349 * If there is no IPv6 socket, then default to bind_addr.
350 */
351 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
352 sp = bp_sp;
353 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
354 sp = addr_sp;
355 else
356 sp = bp_sp;
357
358 rcu_read_lock();
359 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
360 if (!laddr->valid)
361 continue;
362
363 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
364 if (conflict)
365 break;
366 }
367 rcu_read_unlock();
368
369 return conflict;
370}
371
372/* Get the state of the entry in the bind_addr_list */
373int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
374 const union sctp_addr *addr)
375{
376 struct sctp_sockaddr_entry *laddr;
377 struct sctp_af *af;
378 int state = -1;
379
380 af = sctp_get_af_specific(addr->sa.sa_family);
381 if (unlikely(!af))
382 return state;
383
384 rcu_read_lock();
385 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
386 if (!laddr->valid)
387 continue;
388 if (af->cmp_addr(&laddr->a, addr)) {
389 state = laddr->state;
390 break;
391 }
392 }
393 rcu_read_unlock();
394
395 return state;
396}
397
398/* Find the first address in the bind address list that is not present in
399 * the addrs packed array.
400 */
401union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
402 const union sctp_addr *addrs,
403 int addrcnt,
404 struct sctp_sock *opt)
405{
406 struct sctp_sockaddr_entry *laddr;
407 union sctp_addr *addr;
408 void *addr_buf;
409 struct sctp_af *af;
410 int i;
411
412 /* This is only called sctp_send_asconf_del_ip() and we hold
413 * the socket lock in that code patch, so that address list
414 * can't change.
415 */
416 list_for_each_entry(laddr, &bp->address_list, list) {
417 addr_buf = (union sctp_addr *)addrs;
418 for (i = 0; i < addrcnt; i++) {
419 addr = addr_buf;
420 af = sctp_get_af_specific(addr->v4.sin_family);
421 if (!af)
422 break;
423
424 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
425 break;
426
427 addr_buf += af->sockaddr_len;
428 }
429 if (i == addrcnt)
430 return &laddr->a;
431 }
432
433 return NULL;
434}
435
436/* Copy out addresses from the global local address list. */
437static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
438 union sctp_addr *addr,
439 sctp_scope_t scope, gfp_t gfp,
440 int flags)
441{
442 int error = 0;
443
444 if (sctp_is_any(NULL, addr)) {
445 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
446 } else if (sctp_in_scope(net, addr, scope)) {
447 /* Now that the address is in scope, check to see if
448 * the address type is supported by local sock as
449 * well as the remote peer.
450 */
451 if ((((AF_INET == addr->sa.sa_family) &&
452 (flags & SCTP_ADDR4_PEERSUPP))) ||
453 (((AF_INET6 == addr->sa.sa_family) &&
454 (flags & SCTP_ADDR6_ALLOWED) &&
455 (flags & SCTP_ADDR6_PEERSUPP))))
456 error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
457 gfp);
458 }
459
460 return error;
461}
462
463/* Is this a wildcard address? */
464int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
465{
466 unsigned short fam = 0;
467 struct sctp_af *af;
468
469 /* Try to get the right address family */
470 if (addr->sa.sa_family != AF_UNSPEC)
471 fam = addr->sa.sa_family;
472 else if (sk)
473 fam = sk->sk_family;
474
475 af = sctp_get_af_specific(fam);
476 if (!af)
477 return 0;
478
479 return af->is_any(addr);
480}
481
482/* Is 'addr' valid for 'scope'? */
483int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope)
484{
485 sctp_scope_t addr_scope = sctp_scope(addr);
486
487 /* The unusable SCTP addresses will not be considered with
488 * any defined scopes.
489 */
490 if (SCTP_SCOPE_UNUSABLE == addr_scope)
491 return 0;
492 /*
493 * For INIT and INIT-ACK address list, let L be the level of
494 * of requested destination address, sender and receiver
495 * SHOULD include all of its addresses with level greater
496 * than or equal to L.
497 *
498 * Address scoping can be selectively controlled via sysctl
499 * option
500 */
501 switch (net->sctp.scope_policy) {
502 case SCTP_SCOPE_POLICY_DISABLE:
503 return 1;
504 case SCTP_SCOPE_POLICY_ENABLE:
505 if (addr_scope <= scope)
506 return 1;
507 break;
508 case SCTP_SCOPE_POLICY_PRIVATE:
509 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
510 return 1;
511 break;
512 case SCTP_SCOPE_POLICY_LINK:
513 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
514 return 1;
515 break;
516 default:
517 break;
518 }
519
520 return 0;
521}
522
523int sctp_is_ep_boundall(struct sock *sk)
524{
525 struct sctp_bind_addr *bp;
526 struct sctp_sockaddr_entry *addr;
527
528 bp = &sctp_sk(sk)->ep->base.bind_addr;
529 if (sctp_list_single_entry(&bp->address_list)) {
530 addr = list_entry(bp->address_list.next,
531 struct sctp_sockaddr_entry, list);
532 if (sctp_is_any(sk, &addr->a))
533 return 1;
534 }
535 return 0;
536}
537
538/********************************************************************
539 * 3rd Level Abstractions
540 ********************************************************************/
541
542/* What is the scope of 'addr'? */
543sctp_scope_t sctp_scope(const union sctp_addr *addr)
544{
545 struct sctp_af *af;
546
547 af = sctp_get_af_specific(addr->sa.sa_family);
548 if (!af)
549 return SCTP_SCOPE_UNUSABLE;
550
551 return af->scope((union sctp_addr *)addr);
552}
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}