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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* SCTP kernel implementation
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 *
8 * This file is part of the SCTP kernel implementation.
9 *
10 * A collection class to handle the storage of transport addresses.
11 *
12 * Please send any bug reports or fixes you make to the
13 * email address(es):
14 * lksctp developers <linux-sctp@vger.kernel.org>
15 *
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>
21 */
22
23#include <linux/types.h>
24#include <linux/slab.h>
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. */
33static 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);
36static 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 */
43int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
44 const struct sctp_bind_addr *src,
45 enum sctp_scope scope, gfp_t gfp,
46 int flags)
47{
48 struct sctp_sockaddr_entry *addr;
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. */
55 list_for_each_entry(addr, &src->address_list, list) {
56 error = sctp_copy_one_addr(net, dest, &addr->a, scope,
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)) {
67 list_for_each_entry(addr, &src->address_list, list) {
68 error = sctp_copy_one_addr(net, dest, &addr->a,
69 SCTP_SCOPE_LINK, gfp,
70 flags);
71 if (error < 0)
72 goto out;
73 }
74 }
75
76out:
77 if (error)
78 sctp_bind_addr_clean(dest);
79
80 return error;
81}
82
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 */
88int 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;
93 int error = 0;
94
95 /* All addresses share the same port. */
96 dest->port = src->port;
97
98 list_for_each_entry(addr, &src->address_list, list) {
99 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
100 1, gfp);
101 if (error < 0)
102 break;
103 }
104
105 return error;
106}
107
108/* Initialize the SCTP_bind_addr structure for either an endpoint or
109 * an association.
110 */
111void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
112{
113 INIT_LIST_HEAD(&bp->address_list);
114 bp->port = port;
115}
116
117/* Dispose of the address list. */
118static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
119{
120 struct sctp_sockaddr_entry *addr, *temp;
121
122 /* Empty the bind address list. */
123 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
124 list_del_rcu(&addr->list);
125 kfree_rcu(addr, rcu);
126 SCTP_DBG_OBJCNT_DEC(addr);
127 }
128}
129
130/* Dispose of an SCTP_bind_addr structure */
131void sctp_bind_addr_free(struct sctp_bind_addr *bp)
132{
133 /* Empty the bind address list. */
134 sctp_bind_addr_clean(bp);
135}
136
137/* Add an address to the bind address list in the SCTP_bind_addr structure. */
138int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
139 int new_size, __u8 addr_state, gfp_t gfp)
140{
141 struct sctp_sockaddr_entry *addr;
142
143 /* Add the address to the bind address list. */
144 addr = kzalloc(sizeof(*addr), gfp);
145 if (!addr)
146 return -ENOMEM;
147
148 memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
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 */
153 if (!addr->a.v4.sin_port)
154 addr->a.v4.sin_port = htons(bp->port);
155
156 addr->state = addr_state;
157 addr->valid = 1;
158
159 INIT_LIST_HEAD(&addr->list);
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);
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 */
173int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
174{
175 struct sctp_sockaddr_entry *addr, *temp;
176 int found = 0;
177
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) {
182 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
183 /* Found the exact match. */
184 found = 1;
185 addr->valid = 0;
186 list_del_rcu(&addr->list);
187 break;
188 }
189 }
190
191 if (found) {
192 kfree_rcu(addr, rcu);
193 SCTP_DBG_OBJCNT_DEC(addr);
194 return 0;
195 }
196
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 */
205union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
206 int *addrs_len,
207 gfp_t gfp)
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
240 list_for_each_entry(addr, &bp->address_list, list) {
241 af = sctp_get_af_specific(addr->a.v4.sin_family);
242 len = af->to_addr_param(&addr->a, &rawaddr);
243 memcpy(addrparms.v, &rawaddr, len);
244 addrparms.v += len;
245 addrparms_len += len;
246 }
247
248end_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 */
257int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
258 int addrs_len, __u16 port, gfp_t gfp)
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 !af->from_addr_param(&addr, rawaddr, htons(port), 0)) {
275 retval = -EINVAL;
276 goto out_err;
277 }
278
279 if (sctp_bind_addr_state(bp, &addr) != -1)
280 goto next;
281 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
282 SCTP_ADDR_SRC, gfp);
283 if (retval)
284 /* Can't finish building the list, clean up. */
285 goto out_err;
286
287next:
288 len = ntohs(param->length);
289 addrs_len -= len;
290 raw_addr_list += len;
291 }
292
293 return retval;
294
295out_err:
296 if (retval)
297 sctp_bind_addr_clean(bp);
298
299 return retval;
300}
301
302/********************************************************************
303 * 2nd Level Abstractions
304 ********************************************************************/
305
306/* Does this contain a specified address? Allow wildcarding. */
307int sctp_bind_addr_match(struct sctp_bind_addr *bp,
308 const union sctp_addr *addr,
309 struct sctp_sock *opt)
310{
311 struct sctp_sockaddr_entry *laddr;
312 int match = 0;
313
314 rcu_read_lock();
315 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
316 if (!laddr->valid)
317 continue;
318 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
319 match = 1;
320 break;
321 }
322 }
323 rcu_read_unlock();
324
325 return match;
326}
327
328int sctp_bind_addrs_check(struct sctp_sock *sp,
329 struct sctp_sock *sp2, int cnt2)
330{
331 struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr;
332 struct sctp_bind_addr *bp = &sp->ep->base.bind_addr;
333 struct sctp_sockaddr_entry *laddr, *laddr2;
334 bool exist = false;
335 int cnt = 0;
336
337 rcu_read_lock();
338 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
339 list_for_each_entry_rcu(laddr2, &bp2->address_list, list) {
340 if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) &&
341 laddr->valid && laddr2->valid) {
342 exist = true;
343 goto next;
344 }
345 }
346 cnt = 0;
347 break;
348next:
349 cnt++;
350 }
351 rcu_read_unlock();
352
353 return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1);
354}
355
356/* Does the address 'addr' conflict with any addresses in
357 * the bp.
358 */
359int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
360 const union sctp_addr *addr,
361 struct sctp_sock *bp_sp,
362 struct sctp_sock *addr_sp)
363{
364 struct sctp_sockaddr_entry *laddr;
365 int conflict = 0;
366 struct sctp_sock *sp;
367
368 /* Pick the IPv6 socket as the basis of comparison
369 * since it's usually a superset of the IPv4.
370 * If there is no IPv6 socket, then default to bind_addr.
371 */
372 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
373 sp = bp_sp;
374 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
375 sp = addr_sp;
376 else
377 sp = bp_sp;
378
379 rcu_read_lock();
380 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
381 if (!laddr->valid)
382 continue;
383
384 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
385 if (conflict)
386 break;
387 }
388 rcu_read_unlock();
389
390 return conflict;
391}
392
393/* Get the state of the entry in the bind_addr_list */
394int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
395 const union sctp_addr *addr)
396{
397 struct sctp_sockaddr_entry *laddr;
398 struct sctp_af *af;
399
400 af = sctp_get_af_specific(addr->sa.sa_family);
401 if (unlikely(!af))
402 return -1;
403
404 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
405 if (!laddr->valid)
406 continue;
407 if (af->cmp_addr(&laddr->a, addr))
408 return laddr->state;
409 }
410
411 return -1;
412}
413
414/* Find the first address in the bind address list that is not present in
415 * the addrs packed array.
416 */
417union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
418 const union sctp_addr *addrs,
419 int addrcnt,
420 struct sctp_sock *opt)
421{
422 struct sctp_sockaddr_entry *laddr;
423 union sctp_addr *addr;
424 void *addr_buf;
425 struct sctp_af *af;
426 int i;
427
428 /* This is only called sctp_send_asconf_del_ip() and we hold
429 * the socket lock in that code patch, so that address list
430 * can't change.
431 */
432 list_for_each_entry(laddr, &bp->address_list, list) {
433 addr_buf = (union sctp_addr *)addrs;
434 for (i = 0; i < addrcnt; i++) {
435 addr = addr_buf;
436 af = sctp_get_af_specific(addr->v4.sin_family);
437 if (!af)
438 break;
439
440 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
441 break;
442
443 addr_buf += af->sockaddr_len;
444 }
445 if (i == addrcnt)
446 return &laddr->a;
447 }
448
449 return NULL;
450}
451
452/* Copy out addresses from the global local address list. */
453static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
454 union sctp_addr *addr, enum sctp_scope scope,
455 gfp_t gfp, int flags)
456{
457 int error = 0;
458
459 if (sctp_is_any(NULL, addr)) {
460 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
461 } else if (sctp_in_scope(net, addr, scope)) {
462 /* Now that the address is in scope, check to see if
463 * the address type is supported by local sock as
464 * well as the remote peer.
465 */
466 if ((((AF_INET == addr->sa.sa_family) &&
467 (flags & SCTP_ADDR4_ALLOWED) &&
468 (flags & SCTP_ADDR4_PEERSUPP))) ||
469 (((AF_INET6 == addr->sa.sa_family) &&
470 (flags & SCTP_ADDR6_ALLOWED) &&
471 (flags & SCTP_ADDR6_PEERSUPP))))
472 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
473 SCTP_ADDR_SRC, gfp);
474 }
475
476 return error;
477}
478
479/* Is this a wildcard address? */
480int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
481{
482 unsigned short fam = 0;
483 struct sctp_af *af;
484
485 /* Try to get the right address family */
486 if (addr->sa.sa_family != AF_UNSPEC)
487 fam = addr->sa.sa_family;
488 else if (sk)
489 fam = sk->sk_family;
490
491 af = sctp_get_af_specific(fam);
492 if (!af)
493 return 0;
494
495 return af->is_any(addr);
496}
497
498/* Is 'addr' valid for 'scope'? */
499int sctp_in_scope(struct net *net, const union sctp_addr *addr,
500 enum sctp_scope scope)
501{
502 enum sctp_scope addr_scope = sctp_scope(addr);
503
504 /* The unusable SCTP addresses will not be considered with
505 * any defined scopes.
506 */
507 if (SCTP_SCOPE_UNUSABLE == addr_scope)
508 return 0;
509 /*
510 * For INIT and INIT-ACK address list, let L be the level of
511 * requested destination address, sender and receiver
512 * SHOULD include all of its addresses with level greater
513 * than or equal to L.
514 *
515 * Address scoping can be selectively controlled via sysctl
516 * option
517 */
518 switch (net->sctp.scope_policy) {
519 case SCTP_SCOPE_POLICY_DISABLE:
520 return 1;
521 case SCTP_SCOPE_POLICY_ENABLE:
522 if (addr_scope <= scope)
523 return 1;
524 break;
525 case SCTP_SCOPE_POLICY_PRIVATE:
526 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
527 return 1;
528 break;
529 case SCTP_SCOPE_POLICY_LINK:
530 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
531 return 1;
532 break;
533 default:
534 break;
535 }
536
537 return 0;
538}
539
540int sctp_is_ep_boundall(struct sock *sk)
541{
542 struct sctp_bind_addr *bp;
543 struct sctp_sockaddr_entry *addr;
544
545 bp = &sctp_sk(sk)->ep->base.bind_addr;
546 if (sctp_list_single_entry(&bp->address_list)) {
547 addr = list_entry(bp->address_list.next,
548 struct sctp_sockaddr_entry, list);
549 if (sctp_is_any(sk, &addr->a))
550 return 1;
551 }
552 return 0;
553}
554
555/********************************************************************
556 * 3rd Level Abstractions
557 ********************************************************************/
558
559/* What is the scope of 'addr'? */
560enum sctp_scope sctp_scope(const union sctp_addr *addr)
561{
562 struct sctp_af *af;
563
564 af = sctp_get_af_specific(addr->sa.sa_family);
565 if (!af)
566 return SCTP_SCOPE_UNUSABLE;
567
568 return af->scope((union sctp_addr *)addr);
569}
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 *net, struct sctp_bind_addr *dest,
49 union sctp_addr *addr, enum sctp_scope scope,
50 gfp_t gfp, 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 enum sctp_scope 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 if (sctp_bind_addr_state(bp, &addr) != -1)
296 goto next;
297 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
298 SCTP_ADDR_SRC, gfp);
299 if (retval) {
300 /* Can't finish building the list, clean up. */
301 sctp_bind_addr_clean(bp);
302 break;
303 }
304
305next:
306 len = ntohs(param->length);
307 addrs_len -= len;
308 raw_addr_list += len;
309 }
310
311 return retval;
312}
313
314/********************************************************************
315 * 2nd Level Abstractions
316 ********************************************************************/
317
318/* Does this contain a specified address? Allow wildcarding. */
319int sctp_bind_addr_match(struct sctp_bind_addr *bp,
320 const union sctp_addr *addr,
321 struct sctp_sock *opt)
322{
323 struct sctp_sockaddr_entry *laddr;
324 int match = 0;
325
326 rcu_read_lock();
327 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
328 if (!laddr->valid)
329 continue;
330 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
331 match = 1;
332 break;
333 }
334 }
335 rcu_read_unlock();
336
337 return match;
338}
339
340/* Does the address 'addr' conflict with any addresses in
341 * the bp.
342 */
343int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
344 const union sctp_addr *addr,
345 struct sctp_sock *bp_sp,
346 struct sctp_sock *addr_sp)
347{
348 struct sctp_sockaddr_entry *laddr;
349 int conflict = 0;
350 struct sctp_sock *sp;
351
352 /* Pick the IPv6 socket as the basis of comparison
353 * since it's usually a superset of the IPv4.
354 * If there is no IPv6 socket, then default to bind_addr.
355 */
356 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
357 sp = bp_sp;
358 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
359 sp = addr_sp;
360 else
361 sp = bp_sp;
362
363 rcu_read_lock();
364 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
365 if (!laddr->valid)
366 continue;
367
368 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
369 if (conflict)
370 break;
371 }
372 rcu_read_unlock();
373
374 return conflict;
375}
376
377/* Get the state of the entry in the bind_addr_list */
378int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
379 const union sctp_addr *addr)
380{
381 struct sctp_sockaddr_entry *laddr;
382 struct sctp_af *af;
383 int state = -1;
384
385 af = sctp_get_af_specific(addr->sa.sa_family);
386 if (unlikely(!af))
387 return state;
388
389 rcu_read_lock();
390 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
391 if (!laddr->valid)
392 continue;
393 if (af->cmp_addr(&laddr->a, addr)) {
394 state = laddr->state;
395 break;
396 }
397 }
398 rcu_read_unlock();
399
400 return state;
401}
402
403/* Find the first address in the bind address list that is not present in
404 * the addrs packed array.
405 */
406union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
407 const union sctp_addr *addrs,
408 int addrcnt,
409 struct sctp_sock *opt)
410{
411 struct sctp_sockaddr_entry *laddr;
412 union sctp_addr *addr;
413 void *addr_buf;
414 struct sctp_af *af;
415 int i;
416
417 /* This is only called sctp_send_asconf_del_ip() and we hold
418 * the socket lock in that code patch, so that address list
419 * can't change.
420 */
421 list_for_each_entry(laddr, &bp->address_list, list) {
422 addr_buf = (union sctp_addr *)addrs;
423 for (i = 0; i < addrcnt; i++) {
424 addr = addr_buf;
425 af = sctp_get_af_specific(addr->v4.sin_family);
426 if (!af)
427 break;
428
429 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
430 break;
431
432 addr_buf += af->sockaddr_len;
433 }
434 if (i == addrcnt)
435 return &laddr->a;
436 }
437
438 return NULL;
439}
440
441/* Copy out addresses from the global local address list. */
442static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
443 union sctp_addr *addr, enum sctp_scope scope,
444 gfp_t gfp, int flags)
445{
446 int error = 0;
447
448 if (sctp_is_any(NULL, addr)) {
449 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
450 } else if (sctp_in_scope(net, addr, scope)) {
451 /* Now that the address is in scope, check to see if
452 * the address type is supported by local sock as
453 * well as the remote peer.
454 */
455 if ((((AF_INET == addr->sa.sa_family) &&
456 (flags & SCTP_ADDR4_PEERSUPP))) ||
457 (((AF_INET6 == addr->sa.sa_family) &&
458 (flags & SCTP_ADDR6_ALLOWED) &&
459 (flags & SCTP_ADDR6_PEERSUPP))))
460 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
461 SCTP_ADDR_SRC, gfp);
462 }
463
464 return error;
465}
466
467/* Is this a wildcard address? */
468int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
469{
470 unsigned short fam = 0;
471 struct sctp_af *af;
472
473 /* Try to get the right address family */
474 if (addr->sa.sa_family != AF_UNSPEC)
475 fam = addr->sa.sa_family;
476 else if (sk)
477 fam = sk->sk_family;
478
479 af = sctp_get_af_specific(fam);
480 if (!af)
481 return 0;
482
483 return af->is_any(addr);
484}
485
486/* Is 'addr' valid for 'scope'? */
487int sctp_in_scope(struct net *net, const union sctp_addr *addr,
488 enum sctp_scope scope)
489{
490 enum sctp_scope addr_scope = sctp_scope(addr);
491
492 /* The unusable SCTP addresses will not be considered with
493 * any defined scopes.
494 */
495 if (SCTP_SCOPE_UNUSABLE == addr_scope)
496 return 0;
497 /*
498 * For INIT and INIT-ACK address list, let L be the level of
499 * of requested destination address, sender and receiver
500 * SHOULD include all of its addresses with level greater
501 * than or equal to L.
502 *
503 * Address scoping can be selectively controlled via sysctl
504 * option
505 */
506 switch (net->sctp.scope_policy) {
507 case SCTP_SCOPE_POLICY_DISABLE:
508 return 1;
509 case SCTP_SCOPE_POLICY_ENABLE:
510 if (addr_scope <= scope)
511 return 1;
512 break;
513 case SCTP_SCOPE_POLICY_PRIVATE:
514 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
515 return 1;
516 break;
517 case SCTP_SCOPE_POLICY_LINK:
518 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
519 return 1;
520 break;
521 default:
522 break;
523 }
524
525 return 0;
526}
527
528int sctp_is_ep_boundall(struct sock *sk)
529{
530 struct sctp_bind_addr *bp;
531 struct sctp_sockaddr_entry *addr;
532
533 bp = &sctp_sk(sk)->ep->base.bind_addr;
534 if (sctp_list_single_entry(&bp->address_list)) {
535 addr = list_entry(bp->address_list.next,
536 struct sctp_sockaddr_entry, list);
537 if (sctp_is_any(sk, &addr->a))
538 return 1;
539 }
540 return 0;
541}
542
543/********************************************************************
544 * 3rd Level Abstractions
545 ********************************************************************/
546
547/* What is the scope of 'addr'? */
548enum sctp_scope sctp_scope(const union sctp_addr *addr)
549{
550 struct sctp_af *af;
551
552 af = sctp_get_af_specific(addr->sa.sa_family);
553 if (!af)
554 return SCTP_SCOPE_UNUSABLE;
555
556 return af->scope((union sctp_addr *)addr);
557}