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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// 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 retval = -EINVAL;
275 sctp_bind_addr_clean(bp);
276 break;
277 }
278
279 af->from_addr_param(&addr, rawaddr, htons(port), 0);
280 if (sctp_bind_addr_state(bp, &addr) != -1)
281 goto next;
282 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
283 SCTP_ADDR_SRC, gfp);
284 if (retval) {
285 /* Can't finish building the list, clean up. */
286 sctp_bind_addr_clean(bp);
287 break;
288 }
289
290next:
291 len = ntohs(param->length);
292 addrs_len -= len;
293 raw_addr_list += len;
294 }
295
296 return retval;
297}
298
299/********************************************************************
300 * 2nd Level Abstractions
301 ********************************************************************/
302
303/* Does this contain a specified address? Allow wildcarding. */
304int sctp_bind_addr_match(struct sctp_bind_addr *bp,
305 const union sctp_addr *addr,
306 struct sctp_sock *opt)
307{
308 struct sctp_sockaddr_entry *laddr;
309 int match = 0;
310
311 rcu_read_lock();
312 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
313 if (!laddr->valid)
314 continue;
315 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
316 match = 1;
317 break;
318 }
319 }
320 rcu_read_unlock();
321
322 return match;
323}
324
325int sctp_bind_addrs_check(struct sctp_sock *sp,
326 struct sctp_sock *sp2, int cnt2)
327{
328 struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr;
329 struct sctp_bind_addr *bp = &sp->ep->base.bind_addr;
330 struct sctp_sockaddr_entry *laddr, *laddr2;
331 bool exist = false;
332 int cnt = 0;
333
334 rcu_read_lock();
335 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
336 list_for_each_entry_rcu(laddr2, &bp2->address_list, list) {
337 if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) &&
338 laddr->valid && laddr2->valid) {
339 exist = true;
340 goto next;
341 }
342 }
343 cnt = 0;
344 break;
345next:
346 cnt++;
347 }
348 rcu_read_unlock();
349
350 return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1);
351}
352
353/* Does the address 'addr' conflict with any addresses in
354 * the bp.
355 */
356int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
357 const union sctp_addr *addr,
358 struct sctp_sock *bp_sp,
359 struct sctp_sock *addr_sp)
360{
361 struct sctp_sockaddr_entry *laddr;
362 int conflict = 0;
363 struct sctp_sock *sp;
364
365 /* Pick the IPv6 socket as the basis of comparison
366 * since it's usually a superset of the IPv4.
367 * If there is no IPv6 socket, then default to bind_addr.
368 */
369 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
370 sp = bp_sp;
371 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
372 sp = addr_sp;
373 else
374 sp = bp_sp;
375
376 rcu_read_lock();
377 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
378 if (!laddr->valid)
379 continue;
380
381 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
382 if (conflict)
383 break;
384 }
385 rcu_read_unlock();
386
387 return conflict;
388}
389
390/* Get the state of the entry in the bind_addr_list */
391int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
392 const union sctp_addr *addr)
393{
394 struct sctp_sockaddr_entry *laddr;
395 struct sctp_af *af;
396
397 af = sctp_get_af_specific(addr->sa.sa_family);
398 if (unlikely(!af))
399 return -1;
400
401 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
402 if (!laddr->valid)
403 continue;
404 if (af->cmp_addr(&laddr->a, addr))
405 return laddr->state;
406 }
407
408 return -1;
409}
410
411/* Find the first address in the bind address list that is not present in
412 * the addrs packed array.
413 */
414union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
415 const union sctp_addr *addrs,
416 int addrcnt,
417 struct sctp_sock *opt)
418{
419 struct sctp_sockaddr_entry *laddr;
420 union sctp_addr *addr;
421 void *addr_buf;
422 struct sctp_af *af;
423 int i;
424
425 /* This is only called sctp_send_asconf_del_ip() and we hold
426 * the socket lock in that code patch, so that address list
427 * can't change.
428 */
429 list_for_each_entry(laddr, &bp->address_list, list) {
430 addr_buf = (union sctp_addr *)addrs;
431 for (i = 0; i < addrcnt; i++) {
432 addr = addr_buf;
433 af = sctp_get_af_specific(addr->v4.sin_family);
434 if (!af)
435 break;
436
437 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
438 break;
439
440 addr_buf += af->sockaddr_len;
441 }
442 if (i == addrcnt)
443 return &laddr->a;
444 }
445
446 return NULL;
447}
448
449/* Copy out addresses from the global local address list. */
450static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
451 union sctp_addr *addr, enum sctp_scope scope,
452 gfp_t gfp, int flags)
453{
454 int error = 0;
455
456 if (sctp_is_any(NULL, addr)) {
457 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
458 } else if (sctp_in_scope(net, addr, scope)) {
459 /* Now that the address is in scope, check to see if
460 * the address type is supported by local sock as
461 * well as the remote peer.
462 */
463 if ((((AF_INET == addr->sa.sa_family) &&
464 (flags & SCTP_ADDR4_ALLOWED) &&
465 (flags & SCTP_ADDR4_PEERSUPP))) ||
466 (((AF_INET6 == addr->sa.sa_family) &&
467 (flags & SCTP_ADDR6_ALLOWED) &&
468 (flags & SCTP_ADDR6_PEERSUPP))))
469 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
470 SCTP_ADDR_SRC, gfp);
471 }
472
473 return error;
474}
475
476/* Is this a wildcard address? */
477int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
478{
479 unsigned short fam = 0;
480 struct sctp_af *af;
481
482 /* Try to get the right address family */
483 if (addr->sa.sa_family != AF_UNSPEC)
484 fam = addr->sa.sa_family;
485 else if (sk)
486 fam = sk->sk_family;
487
488 af = sctp_get_af_specific(fam);
489 if (!af)
490 return 0;
491
492 return af->is_any(addr);
493}
494
495/* Is 'addr' valid for 'scope'? */
496int sctp_in_scope(struct net *net, const union sctp_addr *addr,
497 enum sctp_scope scope)
498{
499 enum sctp_scope 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 (net->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'? */
557enum sctp_scope 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}