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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
76 /* If somehow no addresses were found that can be used with this
77 * scope, it's an error.
78 */
79 if (list_empty(&dest->address_list))
80 error = -ENETUNREACH;
81
82out:
83 if (error)
84 sctp_bind_addr_clean(dest);
85
86 return error;
87}
88
89/* Exactly duplicate the address lists. This is necessary when doing
90 * peer-offs and accepts. We don't want to put all the current system
91 * addresses into the endpoint. That's useless. But we do want duplicat
92 * the list of bound addresses that the older endpoint used.
93 */
94int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
95 const struct sctp_bind_addr *src,
96 gfp_t gfp)
97{
98 struct sctp_sockaddr_entry *addr;
99 int error = 0;
100
101 /* All addresses share the same port. */
102 dest->port = src->port;
103
104 list_for_each_entry(addr, &src->address_list, list) {
105 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
106 1, gfp);
107 if (error < 0)
108 break;
109 }
110
111 return error;
112}
113
114/* Initialize the SCTP_bind_addr structure for either an endpoint or
115 * an association.
116 */
117void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
118{
119 INIT_LIST_HEAD(&bp->address_list);
120 bp->port = port;
121}
122
123/* Dispose of the address list. */
124static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
125{
126 struct sctp_sockaddr_entry *addr, *temp;
127
128 /* Empty the bind address list. */
129 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
130 list_del_rcu(&addr->list);
131 kfree_rcu(addr, rcu);
132 SCTP_DBG_OBJCNT_DEC(addr);
133 }
134}
135
136/* Dispose of an SCTP_bind_addr structure */
137void sctp_bind_addr_free(struct sctp_bind_addr *bp)
138{
139 /* Empty the bind address list. */
140 sctp_bind_addr_clean(bp);
141}
142
143/* Add an address to the bind address list in the SCTP_bind_addr structure. */
144int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
145 int new_size, __u8 addr_state, gfp_t gfp)
146{
147 struct sctp_sockaddr_entry *addr;
148
149 /* Add the address to the bind address list. */
150 addr = kzalloc(sizeof(*addr), gfp);
151 if (!addr)
152 return -ENOMEM;
153
154 memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
155
156 /* Fix up the port if it has not yet been set.
157 * Both v4 and v6 have the port at the same offset.
158 */
159 if (!addr->a.v4.sin_port)
160 addr->a.v4.sin_port = htons(bp->port);
161
162 addr->state = addr_state;
163 addr->valid = 1;
164
165 INIT_LIST_HEAD(&addr->list);
166
167 /* We always hold a socket lock when calling this function,
168 * and that acts as a writer synchronizing lock.
169 */
170 list_add_tail_rcu(&addr->list, &bp->address_list);
171 SCTP_DBG_OBJCNT_INC(addr);
172
173 return 0;
174}
175
176/* Delete an address from the bind address list in the SCTP_bind_addr
177 * structure.
178 */
179int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
180{
181 struct sctp_sockaddr_entry *addr, *temp;
182 int found = 0;
183
184 /* We hold the socket lock when calling this function,
185 * and that acts as a writer synchronizing lock.
186 */
187 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
188 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
189 /* Found the exact match. */
190 found = 1;
191 addr->valid = 0;
192 list_del_rcu(&addr->list);
193 break;
194 }
195 }
196
197 if (found) {
198 kfree_rcu(addr, rcu);
199 SCTP_DBG_OBJCNT_DEC(addr);
200 return 0;
201 }
202
203 return -EINVAL;
204}
205
206/* Create a network byte-order representation of all the addresses
207 * formated as SCTP parameters.
208 *
209 * The second argument is the return value for the length.
210 */
211union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
212 int *addrs_len,
213 gfp_t gfp)
214{
215 union sctp_params addrparms;
216 union sctp_params retval;
217 int addrparms_len;
218 union sctp_addr_param rawaddr;
219 int len;
220 struct sctp_sockaddr_entry *addr;
221 struct list_head *pos;
222 struct sctp_af *af;
223
224 addrparms_len = 0;
225 len = 0;
226
227 /* Allocate enough memory at once. */
228 list_for_each(pos, &bp->address_list) {
229 len += sizeof(union sctp_addr_param);
230 }
231
232 /* Don't even bother embedding an address if there
233 * is only one.
234 */
235 if (len == sizeof(union sctp_addr_param)) {
236 retval.v = NULL;
237 goto end_raw;
238 }
239
240 retval.v = kmalloc(len, gfp);
241 if (!retval.v)
242 goto end_raw;
243
244 addrparms = retval;
245
246 list_for_each_entry(addr, &bp->address_list, list) {
247 af = sctp_get_af_specific(addr->a.v4.sin_family);
248 len = af->to_addr_param(&addr->a, &rawaddr);
249 memcpy(addrparms.v, &rawaddr, len);
250 addrparms.v += len;
251 addrparms_len += len;
252 }
253
254end_raw:
255 *addrs_len = addrparms_len;
256 return retval;
257}
258
259/*
260 * Create an address list out of the raw address list format (IPv4 and IPv6
261 * address parameters).
262 */
263int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
264 int addrs_len, __u16 port, gfp_t gfp)
265{
266 union sctp_addr_param *rawaddr;
267 struct sctp_paramhdr *param;
268 union sctp_addr addr;
269 int retval = 0;
270 int len;
271 struct sctp_af *af;
272
273 /* Convert the raw address to standard address format */
274 while (addrs_len) {
275 param = (struct sctp_paramhdr *)raw_addr_list;
276 rawaddr = (union sctp_addr_param *)raw_addr_list;
277
278 af = sctp_get_af_specific(param_type2af(param->type));
279 if (unlikely(!af) ||
280 !af->from_addr_param(&addr, rawaddr, htons(port), 0)) {
281 retval = -EINVAL;
282 goto out_err;
283 }
284
285 if (sctp_bind_addr_state(bp, &addr) != -1)
286 goto next;
287 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
288 SCTP_ADDR_SRC, gfp);
289 if (retval)
290 /* Can't finish building the list, clean up. */
291 goto out_err;
292
293next:
294 len = ntohs(param->length);
295 addrs_len -= len;
296 raw_addr_list += len;
297 }
298
299 return retval;
300
301out_err:
302 if (retval)
303 sctp_bind_addr_clean(bp);
304
305 return retval;
306}
307
308/********************************************************************
309 * 2nd Level Abstractions
310 ********************************************************************/
311
312/* Does this contain a specified address? Allow wildcarding. */
313int sctp_bind_addr_match(struct sctp_bind_addr *bp,
314 const union sctp_addr *addr,
315 struct sctp_sock *opt)
316{
317 struct sctp_sockaddr_entry *laddr;
318 int match = 0;
319
320 rcu_read_lock();
321 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
322 if (!laddr->valid)
323 continue;
324 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
325 match = 1;
326 break;
327 }
328 }
329 rcu_read_unlock();
330
331 return match;
332}
333
334int sctp_bind_addrs_check(struct sctp_sock *sp,
335 struct sctp_sock *sp2, int cnt2)
336{
337 struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr;
338 struct sctp_bind_addr *bp = &sp->ep->base.bind_addr;
339 struct sctp_sockaddr_entry *laddr, *laddr2;
340 bool exist = false;
341 int cnt = 0;
342
343 rcu_read_lock();
344 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
345 list_for_each_entry_rcu(laddr2, &bp2->address_list, list) {
346 if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) &&
347 laddr->valid && laddr2->valid) {
348 exist = true;
349 goto next;
350 }
351 }
352 cnt = 0;
353 break;
354next:
355 cnt++;
356 }
357 rcu_read_unlock();
358
359 return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1);
360}
361
362/* Does the address 'addr' conflict with any addresses in
363 * the bp.
364 */
365int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
366 const union sctp_addr *addr,
367 struct sctp_sock *bp_sp,
368 struct sctp_sock *addr_sp)
369{
370 struct sctp_sockaddr_entry *laddr;
371 int conflict = 0;
372 struct sctp_sock *sp;
373
374 /* Pick the IPv6 socket as the basis of comparison
375 * since it's usually a superset of the IPv4.
376 * If there is no IPv6 socket, then default to bind_addr.
377 */
378 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
379 sp = bp_sp;
380 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
381 sp = addr_sp;
382 else
383 sp = bp_sp;
384
385 rcu_read_lock();
386 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
387 if (!laddr->valid)
388 continue;
389
390 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
391 if (conflict)
392 break;
393 }
394 rcu_read_unlock();
395
396 return conflict;
397}
398
399/* Get the state of the entry in the bind_addr_list */
400int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
401 const union sctp_addr *addr)
402{
403 struct sctp_sockaddr_entry *laddr;
404 struct sctp_af *af;
405
406 af = sctp_get_af_specific(addr->sa.sa_family);
407 if (unlikely(!af))
408 return -1;
409
410 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
411 if (!laddr->valid)
412 continue;
413 if (af->cmp_addr(&laddr->a, addr))
414 return laddr->state;
415 }
416
417 return -1;
418}
419
420/* Find the first address in the bind address list that is not present in
421 * the addrs packed array.
422 */
423union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
424 const union sctp_addr *addrs,
425 int addrcnt,
426 struct sctp_sock *opt)
427{
428 struct sctp_sockaddr_entry *laddr;
429 union sctp_addr *addr;
430 void *addr_buf;
431 struct sctp_af *af;
432 int i;
433
434 /* This is only called sctp_send_asconf_del_ip() and we hold
435 * the socket lock in that code patch, so that address list
436 * can't change.
437 */
438 list_for_each_entry(laddr, &bp->address_list, list) {
439 addr_buf = (union sctp_addr *)addrs;
440 for (i = 0; i < addrcnt; i++) {
441 addr = addr_buf;
442 af = sctp_get_af_specific(addr->v4.sin_family);
443 if (!af)
444 break;
445
446 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
447 break;
448
449 addr_buf += af->sockaddr_len;
450 }
451 if (i == addrcnt)
452 return &laddr->a;
453 }
454
455 return NULL;
456}
457
458/* Copy out addresses from the global local address list. */
459static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
460 union sctp_addr *addr, enum sctp_scope scope,
461 gfp_t gfp, int flags)
462{
463 int error = 0;
464
465 if (sctp_is_any(NULL, addr)) {
466 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
467 } else if (sctp_in_scope(net, addr, scope)) {
468 /* Now that the address is in scope, check to see if
469 * the address type is supported by local sock as
470 * well as the remote peer.
471 */
472 if ((((AF_INET == addr->sa.sa_family) &&
473 (flags & SCTP_ADDR4_ALLOWED) &&
474 (flags & SCTP_ADDR4_PEERSUPP))) ||
475 (((AF_INET6 == addr->sa.sa_family) &&
476 (flags & SCTP_ADDR6_ALLOWED) &&
477 (flags & SCTP_ADDR6_PEERSUPP))))
478 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
479 SCTP_ADDR_SRC, gfp);
480 }
481
482 return error;
483}
484
485/* Is this a wildcard address? */
486int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
487{
488 unsigned short fam = 0;
489 struct sctp_af *af;
490
491 /* Try to get the right address family */
492 if (addr->sa.sa_family != AF_UNSPEC)
493 fam = addr->sa.sa_family;
494 else if (sk)
495 fam = sk->sk_family;
496
497 af = sctp_get_af_specific(fam);
498 if (!af)
499 return 0;
500
501 return af->is_any(addr);
502}
503
504/* Is 'addr' valid for 'scope'? */
505int sctp_in_scope(struct net *net, const union sctp_addr *addr,
506 enum sctp_scope scope)
507{
508 enum sctp_scope addr_scope = sctp_scope(addr);
509
510 /* The unusable SCTP addresses will not be considered with
511 * any defined scopes.
512 */
513 if (SCTP_SCOPE_UNUSABLE == addr_scope)
514 return 0;
515 /*
516 * For INIT and INIT-ACK address list, let L be the level of
517 * requested destination address, sender and receiver
518 * SHOULD include all of its addresses with level greater
519 * than or equal to L.
520 *
521 * Address scoping can be selectively controlled via sysctl
522 * option
523 */
524 switch (net->sctp.scope_policy) {
525 case SCTP_SCOPE_POLICY_DISABLE:
526 return 1;
527 case SCTP_SCOPE_POLICY_ENABLE:
528 if (addr_scope <= scope)
529 return 1;
530 break;
531 case SCTP_SCOPE_POLICY_PRIVATE:
532 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
533 return 1;
534 break;
535 case SCTP_SCOPE_POLICY_LINK:
536 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
537 return 1;
538 break;
539 default:
540 break;
541 }
542
543 return 0;
544}
545
546int sctp_is_ep_boundall(struct sock *sk)
547{
548 struct sctp_bind_addr *bp;
549 struct sctp_sockaddr_entry *addr;
550
551 bp = &sctp_sk(sk)->ep->base.bind_addr;
552 if (sctp_list_single_entry(&bp->address_list)) {
553 addr = list_entry(bp->address_list.next,
554 struct sctp_sockaddr_entry, list);
555 if (sctp_is_any(sk, &addr->a))
556 return 1;
557 }
558 return 0;
559}
560
561/********************************************************************
562 * 3rd Level Abstractions
563 ********************************************************************/
564
565/* What is the scope of 'addr'? */
566enum sctp_scope sctp_scope(const union sctp_addr *addr)
567{
568 struct sctp_af *af;
569
570 af = sctp_get_af_specific(addr->sa.sa_family);
571 if (!af)
572 return SCTP_SCOPE_UNUSABLE;
573
574 return af->scope((union sctp_addr *)addr);
575}