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
7 * This file is part of the SCTP kernel implementation.
9 * A collection class to handle the storage of transport addresses.
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)
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.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
27 * Please send any bug reports or fixes you make to the
29 * lksctp developers <linux-sctp@vger.kernel.org>
31 * Written or modified by:
32 * La Monte H.P. Yarroll <piggy@acm.org>
33 * Karl Knutson <karl@athena.chicago.il.us>
34 * Jon Grimm <jgrimm@us.ibm.com>
35 * Daisy Chang <daisyc@us.ibm.com>
38 #include <linux/types.h>
39 #include <linux/slab.h>
43 #include <net/if_inet6.h>
44 #include <net/sctp/sctp.h>
45 #include <net/sctp/sm.h>
47 /* Forward declarations for internal helpers. */
48 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
49 union sctp_addr *addr, enum sctp_scope scope,
50 gfp_t gfp, int flags);
51 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
53 /* First Level Abstractions. */
55 /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
56 * in 'src' which have a broader scope than 'scope'.
58 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
59 const struct sctp_bind_addr *src,
60 enum sctp_scope scope, gfp_t gfp,
63 struct sctp_sockaddr_entry *addr;
66 /* All addresses share the same port. */
67 dest->port = src->port;
69 /* Extract the addresses which are relevant for this scope. */
70 list_for_each_entry(addr, &src->address_list, list) {
71 error = sctp_copy_one_addr(net, dest, &addr->a, scope,
77 /* If there are no addresses matching the scope and
78 * this is global scope, try to get a link scope address, with
79 * the assumption that we must be sitting behind a NAT.
81 if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
82 list_for_each_entry(addr, &src->address_list, list) {
83 error = sctp_copy_one_addr(net, dest, &addr->a,
93 sctp_bind_addr_clean(dest);
98 /* Exactly duplicate the address lists. This is necessary when doing
99 * peer-offs and accepts. We don't want to put all the current system
100 * addresses into the endpoint. That's useless. But we do want duplicat
101 * the list of bound addresses that the older endpoint used.
103 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
104 const struct sctp_bind_addr *src,
107 struct sctp_sockaddr_entry *addr;
110 /* All addresses share the same port. */
111 dest->port = src->port;
113 list_for_each_entry(addr, &src->address_list, list) {
114 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
123 /* Initialize the SCTP_bind_addr structure for either an endpoint or
126 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
128 INIT_LIST_HEAD(&bp->address_list);
132 /* Dispose of the address list. */
133 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
135 struct sctp_sockaddr_entry *addr, *temp;
137 /* Empty the bind address list. */
138 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
139 list_del_rcu(&addr->list);
140 kfree_rcu(addr, rcu);
141 SCTP_DBG_OBJCNT_DEC(addr);
145 /* Dispose of an SCTP_bind_addr structure */
146 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
148 /* Empty the bind address list. */
149 sctp_bind_addr_clean(bp);
152 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
153 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
154 int new_size, __u8 addr_state, gfp_t gfp)
156 struct sctp_sockaddr_entry *addr;
158 /* Add the address to the bind address list. */
159 addr = kzalloc(sizeof(*addr), gfp);
163 memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
165 /* Fix up the port if it has not yet been set.
166 * Both v4 and v6 have the port at the same offset.
168 if (!addr->a.v4.sin_port)
169 addr->a.v4.sin_port = htons(bp->port);
171 addr->state = addr_state;
174 INIT_LIST_HEAD(&addr->list);
176 /* We always hold a socket lock when calling this function,
177 * and that acts as a writer synchronizing lock.
179 list_add_tail_rcu(&addr->list, &bp->address_list);
180 SCTP_DBG_OBJCNT_INC(addr);
185 /* Delete an address from the bind address list in the SCTP_bind_addr
188 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
190 struct sctp_sockaddr_entry *addr, *temp;
193 /* We hold the socket lock when calling this function,
194 * and that acts as a writer synchronizing lock.
196 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
197 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
198 /* Found the exact match. */
201 list_del_rcu(&addr->list);
207 kfree_rcu(addr, rcu);
208 SCTP_DBG_OBJCNT_DEC(addr);
215 /* Create a network byte-order representation of all the addresses
216 * formated as SCTP parameters.
218 * The second argument is the return value for the length.
220 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
224 union sctp_params addrparms;
225 union sctp_params retval;
227 union sctp_addr_param rawaddr;
229 struct sctp_sockaddr_entry *addr;
230 struct list_head *pos;
236 /* Allocate enough memory at once. */
237 list_for_each(pos, &bp->address_list) {
238 len += sizeof(union sctp_addr_param);
241 /* Don't even bother embedding an address if there
244 if (len == sizeof(union sctp_addr_param)) {
249 retval.v = kmalloc(len, gfp);
255 list_for_each_entry(addr, &bp->address_list, list) {
256 af = sctp_get_af_specific(addr->a.v4.sin_family);
257 len = af->to_addr_param(&addr->a, &rawaddr);
258 memcpy(addrparms.v, &rawaddr, len);
260 addrparms_len += len;
264 *addrs_len = addrparms_len;
269 * Create an address list out of the raw address list format (IPv4 and IPv6
270 * address parameters).
272 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
273 int addrs_len, __u16 port, gfp_t gfp)
275 union sctp_addr_param *rawaddr;
276 struct sctp_paramhdr *param;
277 union sctp_addr addr;
282 /* Convert the raw address to standard address format */
284 param = (struct sctp_paramhdr *)raw_addr_list;
285 rawaddr = (union sctp_addr_param *)raw_addr_list;
287 af = sctp_get_af_specific(param_type2af(param->type));
289 !af->from_addr_param(&addr, rawaddr, htons(port), 0)) {
294 if (sctp_bind_addr_state(bp, &addr) != -1)
296 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
299 /* Can't finish building the list, clean up. */
303 len = ntohs(param->length);
305 raw_addr_list += len;
312 sctp_bind_addr_clean(bp);
317 /********************************************************************
318 * 2nd Level Abstractions
319 ********************************************************************/
321 /* Does this contain a specified address? Allow wildcarding. */
322 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
323 const union sctp_addr *addr,
324 struct sctp_sock *opt)
326 struct sctp_sockaddr_entry *laddr;
330 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
333 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
343 /* Does the address 'addr' conflict with any addresses in
346 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
347 const union sctp_addr *addr,
348 struct sctp_sock *bp_sp,
349 struct sctp_sock *addr_sp)
351 struct sctp_sockaddr_entry *laddr;
353 struct sctp_sock *sp;
355 /* Pick the IPv6 socket as the basis of comparison
356 * since it's usually a superset of the IPv4.
357 * If there is no IPv6 socket, then default to bind_addr.
359 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
361 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
367 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
371 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
380 /* Get the state of the entry in the bind_addr_list */
381 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
382 const union sctp_addr *addr)
384 struct sctp_sockaddr_entry *laddr;
388 af = sctp_get_af_specific(addr->sa.sa_family);
393 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
396 if (af->cmp_addr(&laddr->a, addr)) {
397 state = laddr->state;
406 /* Find the first address in the bind address list that is not present in
407 * the addrs packed array.
409 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
410 const union sctp_addr *addrs,
412 struct sctp_sock *opt)
414 struct sctp_sockaddr_entry *laddr;
415 union sctp_addr *addr;
420 /* This is only called sctp_send_asconf_del_ip() and we hold
421 * the socket lock in that code patch, so that address list
424 list_for_each_entry(laddr, &bp->address_list, list) {
425 addr_buf = (union sctp_addr *)addrs;
426 for (i = 0; i < addrcnt; i++) {
428 af = sctp_get_af_specific(addr->v4.sin_family);
432 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
435 addr_buf += af->sockaddr_len;
444 /* Copy out addresses from the global local address list. */
445 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
446 union sctp_addr *addr, enum sctp_scope scope,
447 gfp_t gfp, int flags)
451 if (sctp_is_any(NULL, addr)) {
452 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
453 } else if (sctp_in_scope(net, addr, scope)) {
454 /* Now that the address is in scope, check to see if
455 * the address type is supported by local sock as
456 * well as the remote peer.
458 if ((((AF_INET == addr->sa.sa_family) &&
459 (flags & SCTP_ADDR4_ALLOWED) &&
460 (flags & SCTP_ADDR4_PEERSUPP))) ||
461 (((AF_INET6 == addr->sa.sa_family) &&
462 (flags & SCTP_ADDR6_ALLOWED) &&
463 (flags & SCTP_ADDR6_PEERSUPP))))
464 error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
471 /* Is this a wildcard address? */
472 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
474 unsigned short fam = 0;
477 /* Try to get the right address family */
478 if (addr->sa.sa_family != AF_UNSPEC)
479 fam = addr->sa.sa_family;
483 af = sctp_get_af_specific(fam);
487 return af->is_any(addr);
490 /* Is 'addr' valid for 'scope'? */
491 int sctp_in_scope(struct net *net, const union sctp_addr *addr,
492 enum sctp_scope scope)
494 enum sctp_scope addr_scope = sctp_scope(addr);
496 /* The unusable SCTP addresses will not be considered with
497 * any defined scopes.
499 if (SCTP_SCOPE_UNUSABLE == addr_scope)
502 * For INIT and INIT-ACK address list, let L be the level of
503 * of requested destination address, sender and receiver
504 * SHOULD include all of its addresses with level greater
505 * than or equal to L.
507 * Address scoping can be selectively controlled via sysctl
510 switch (net->sctp.scope_policy) {
511 case SCTP_SCOPE_POLICY_DISABLE:
513 case SCTP_SCOPE_POLICY_ENABLE:
514 if (addr_scope <= scope)
517 case SCTP_SCOPE_POLICY_PRIVATE:
518 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
521 case SCTP_SCOPE_POLICY_LINK:
522 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
532 int sctp_is_ep_boundall(struct sock *sk)
534 struct sctp_bind_addr *bp;
535 struct sctp_sockaddr_entry *addr;
537 bp = &sctp_sk(sk)->ep->base.bind_addr;
538 if (sctp_list_single_entry(&bp->address_list)) {
539 addr = list_entry(bp->address_list.next,
540 struct sctp_sockaddr_entry, list);
541 if (sctp_is_any(sk, &addr->a))
547 /********************************************************************
548 * 3rd Level Abstractions
549 ********************************************************************/
551 /* What is the scope of 'addr'? */
552 enum sctp_scope sctp_scope(const union sctp_addr *addr)
556 af = sctp_get_af_specific(addr->sa.sa_family);
558 return SCTP_SCOPE_UNUSABLE;
560 return af->scope((union sctp_addr *)addr);