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 *, struct sctp_bind_addr *,
49 union sctp_addr *, sctp_scope_t scope, gfp_t gfp,
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 sctp_scope_t 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, 1, gfp);
122 /* Initialize the SCTP_bind_addr structure for either an endpoint or
125 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
127 INIT_LIST_HEAD(&bp->address_list);
131 /* Dispose of the address list. */
132 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
134 struct sctp_sockaddr_entry *addr, *temp;
136 /* Empty the bind address list. */
137 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
138 list_del_rcu(&addr->list);
139 kfree_rcu(addr, rcu);
140 SCTP_DBG_OBJCNT_DEC(addr);
144 /* Dispose of an SCTP_bind_addr structure */
145 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
147 /* Empty the bind address list. */
148 sctp_bind_addr_clean(bp);
151 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
152 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
153 __u8 addr_state, gfp_t gfp)
155 struct sctp_sockaddr_entry *addr;
157 /* Add the address to the bind address list. */
158 addr = kzalloc(sizeof(*addr), gfp);
162 memcpy(&addr->a, new, sizeof(*new));
164 /* Fix up the port if it has not yet been set.
165 * Both v4 and v6 have the port at the same offset.
167 if (!addr->a.v4.sin_port)
168 addr->a.v4.sin_port = htons(bp->port);
170 addr->state = addr_state;
173 INIT_LIST_HEAD(&addr->list);
175 /* We always hold a socket lock when calling this function,
176 * and that acts as a writer synchronizing lock.
178 list_add_tail_rcu(&addr->list, &bp->address_list);
179 SCTP_DBG_OBJCNT_INC(addr);
184 /* Delete an address from the bind address list in the SCTP_bind_addr
187 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
189 struct sctp_sockaddr_entry *addr, *temp;
192 /* We hold the socket lock when calling this function,
193 * and that acts as a writer synchronizing lock.
195 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
196 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
197 /* Found the exact match. */
200 list_del_rcu(&addr->list);
206 kfree_rcu(addr, rcu);
207 SCTP_DBG_OBJCNT_DEC(addr);
214 /* Create a network byte-order representation of all the addresses
215 * formated as SCTP parameters.
217 * The second argument is the return value for the length.
219 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
223 union sctp_params addrparms;
224 union sctp_params retval;
226 union sctp_addr_param rawaddr;
228 struct sctp_sockaddr_entry *addr;
229 struct list_head *pos;
235 /* Allocate enough memory at once. */
236 list_for_each(pos, &bp->address_list) {
237 len += sizeof(union sctp_addr_param);
240 /* Don't even bother embedding an address if there
243 if (len == sizeof(union sctp_addr_param)) {
248 retval.v = kmalloc(len, gfp);
254 list_for_each_entry(addr, &bp->address_list, list) {
255 af = sctp_get_af_specific(addr->a.v4.sin_family);
256 len = af->to_addr_param(&addr->a, &rawaddr);
257 memcpy(addrparms.v, &rawaddr, len);
259 addrparms_len += len;
263 *addrs_len = addrparms_len;
268 * Create an address list out of the raw address list format (IPv4 and IPv6
269 * address parameters).
271 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
272 int addrs_len, __u16 port, gfp_t gfp)
274 union sctp_addr_param *rawaddr;
275 struct sctp_paramhdr *param;
276 union sctp_addr addr;
281 /* Convert the raw address to standard address format */
283 param = (struct sctp_paramhdr *)raw_addr_list;
284 rawaddr = (union sctp_addr_param *)raw_addr_list;
286 af = sctp_get_af_specific(param_type2af(param->type));
288 !af->from_addr_param(&addr, rawaddr, htons(port), 0)) {
293 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
297 len = ntohs(param->length);
299 raw_addr_list += len;
306 sctp_bind_addr_clean(bp);
311 /********************************************************************
312 * 2nd Level Abstractions
313 ********************************************************************/
315 /* Does this contain a specified address? Allow wildcarding. */
316 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
317 const union sctp_addr *addr,
318 struct sctp_sock *opt)
320 struct sctp_sockaddr_entry *laddr;
324 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
327 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
337 /* Does the address 'addr' conflict with any addresses in
340 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
341 const union sctp_addr *addr,
342 struct sctp_sock *bp_sp,
343 struct sctp_sock *addr_sp)
345 struct sctp_sockaddr_entry *laddr;
347 struct sctp_sock *sp;
349 /* Pick the IPv6 socket as the basis of comparison
350 * since it's usually a superset of the IPv4.
351 * If there is no IPv6 socket, then default to bind_addr.
353 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
355 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
361 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
365 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
374 /* Get the state of the entry in the bind_addr_list */
375 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
376 const union sctp_addr *addr)
378 struct sctp_sockaddr_entry *laddr;
382 af = sctp_get_af_specific(addr->sa.sa_family);
387 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
390 if (af->cmp_addr(&laddr->a, addr)) {
391 state = laddr->state;
400 /* Find the first address in the bind address list that is not present in
401 * the addrs packed array.
403 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
404 const union sctp_addr *addrs,
406 struct sctp_sock *opt)
408 struct sctp_sockaddr_entry *laddr;
409 union sctp_addr *addr;
414 /* This is only called sctp_send_asconf_del_ip() and we hold
415 * the socket lock in that code patch, so that address list
418 list_for_each_entry(laddr, &bp->address_list, list) {
419 addr_buf = (union sctp_addr *)addrs;
420 for (i = 0; i < addrcnt; i++) {
422 af = sctp_get_af_specific(addr->v4.sin_family);
426 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
429 addr_buf += af->sockaddr_len;
438 /* Copy out addresses from the global local address list. */
439 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
440 union sctp_addr *addr,
441 sctp_scope_t scope, gfp_t gfp,
446 if (sctp_is_any(NULL, addr)) {
447 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
448 } else if (sctp_in_scope(net, addr, scope)) {
449 /* Now that the address is in scope, check to see if
450 * the address type is supported by local sock as
451 * well as the remote peer.
453 if ((((AF_INET == addr->sa.sa_family) &&
454 (flags & SCTP_ADDR4_ALLOWED) &&
455 (flags & SCTP_ADDR4_PEERSUPP))) ||
456 (((AF_INET6 == addr->sa.sa_family) &&
457 (flags & SCTP_ADDR6_ALLOWED) &&
458 (flags & SCTP_ADDR6_PEERSUPP))))
459 error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
466 /* Is this a wildcard address? */
467 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
469 unsigned short fam = 0;
472 /* Try to get the right address family */
473 if (addr->sa.sa_family != AF_UNSPEC)
474 fam = addr->sa.sa_family;
478 af = sctp_get_af_specific(fam);
482 return af->is_any(addr);
485 /* Is 'addr' valid for 'scope'? */
486 int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope)
488 sctp_scope_t addr_scope = sctp_scope(addr);
490 /* The unusable SCTP addresses will not be considered with
491 * any defined scopes.
493 if (SCTP_SCOPE_UNUSABLE == addr_scope)
496 * For INIT and INIT-ACK address list, let L be the level of
497 * of requested destination address, sender and receiver
498 * SHOULD include all of its addresses with level greater
499 * than or equal to L.
501 * Address scoping can be selectively controlled via sysctl
504 switch (net->sctp.scope_policy) {
505 case SCTP_SCOPE_POLICY_DISABLE:
507 case SCTP_SCOPE_POLICY_ENABLE:
508 if (addr_scope <= scope)
511 case SCTP_SCOPE_POLICY_PRIVATE:
512 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
515 case SCTP_SCOPE_POLICY_LINK:
516 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
526 int sctp_is_ep_boundall(struct sock *sk)
528 struct sctp_bind_addr *bp;
529 struct sctp_sockaddr_entry *addr;
531 bp = &sctp_sk(sk)->ep->base.bind_addr;
532 if (sctp_list_single_entry(&bp->address_list)) {
533 addr = list_entry(bp->address_list.next,
534 struct sctp_sockaddr_entry, list);
535 if (sctp_is_any(sk, &addr->a))
541 /********************************************************************
542 * 3rd Level Abstractions
543 ********************************************************************/
545 /* What is the scope of 'addr'? */
546 sctp_scope_t sctp_scope(const union sctp_addr *addr)
550 af = sctp_get_af_specific(addr->sa.sa_family);
552 return SCTP_SCOPE_UNUSABLE;
554 return af->scope((union sctp_addr *)addr);