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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
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}
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}