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, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
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>
41 * Any bugs reported given to us we will try to fix... any fixes shared will
42 * be incorporated into the next SCTP release.
45 #include <linux/types.h>
46 #include <linux/slab.h>
50 #include <net/if_inet6.h>
51 #include <net/sctp/sctp.h>
52 #include <net/sctp/sm.h>
54 /* Forward declarations for internal helpers. */
55 static int sctp_copy_one_addr(struct net *, struct sctp_bind_addr *,
56 union sctp_addr *, sctp_scope_t scope, gfp_t gfp,
58 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
60 /* First Level Abstractions. */
62 /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
63 * in 'src' which have a broader scope than 'scope'.
65 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
66 const struct sctp_bind_addr *src,
67 sctp_scope_t scope, gfp_t gfp,
70 struct sctp_sockaddr_entry *addr;
73 /* All addresses share the same port. */
74 dest->port = src->port;
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(net, dest, &addr->a, scope,
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.
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(net, dest, &addr->a,
100 sctp_bind_addr_clean(dest);
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.
110 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
111 const struct sctp_bind_addr *src,
114 struct sctp_sockaddr_entry *addr;
117 /* All addresses share the same port. */
118 dest->port = src->port;
120 list_for_each_entry(addr, &src->address_list, list) {
121 error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
129 /* Initialize the SCTP_bind_addr structure for either an endpoint or
132 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
134 INIT_LIST_HEAD(&bp->address_list);
138 /* Dispose of the address list. */
139 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
141 struct sctp_sockaddr_entry *addr, *temp;
143 /* Empty the bind address list. */
144 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
145 list_del_rcu(&addr->list);
146 kfree_rcu(addr, rcu);
147 SCTP_DBG_OBJCNT_DEC(addr);
151 /* Dispose of an SCTP_bind_addr structure */
152 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
154 /* Empty the bind address list. */
155 sctp_bind_addr_clean(bp);
158 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
159 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
160 __u8 addr_state, gfp_t gfp)
162 struct sctp_sockaddr_entry *addr;
164 /* Add the address to the bind address list. */
165 addr = t_new(struct sctp_sockaddr_entry, gfp);
169 memcpy(&addr->a, new, sizeof(*new));
171 /* Fix up the port if it has not yet been set.
172 * Both v4 and v6 have the port at the same offset.
174 if (!addr->a.v4.sin_port)
175 addr->a.v4.sin_port = htons(bp->port);
177 addr->state = addr_state;
180 INIT_LIST_HEAD(&addr->list);
182 /* We always hold a socket lock when calling this function,
183 * and that acts as a writer synchronizing lock.
185 list_add_tail_rcu(&addr->list, &bp->address_list);
186 SCTP_DBG_OBJCNT_INC(addr);
191 /* Delete an address from the bind address list in the SCTP_bind_addr
194 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
196 struct sctp_sockaddr_entry *addr, *temp;
199 /* We hold the socket lock when calling this function,
200 * and that acts as a writer synchronizing lock.
202 list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
203 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
204 /* Found the exact match. */
207 list_del_rcu(&addr->list);
213 kfree_rcu(addr, rcu);
214 SCTP_DBG_OBJCNT_DEC(addr);
221 /* Create a network byte-order representation of all the addresses
222 * formated as SCTP parameters.
224 * The second argument is the return value for the length.
226 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
230 union sctp_params addrparms;
231 union sctp_params retval;
233 union sctp_addr_param rawaddr;
235 struct sctp_sockaddr_entry *addr;
236 struct list_head *pos;
242 /* Allocate enough memory at once. */
243 list_for_each(pos, &bp->address_list) {
244 len += sizeof(union sctp_addr_param);
247 /* Don't even bother embedding an address if there
250 if (len == sizeof(union sctp_addr_param)) {
255 retval.v = kmalloc(len, gfp);
261 list_for_each_entry(addr, &bp->address_list, list) {
262 af = sctp_get_af_specific(addr->a.v4.sin_family);
263 len = af->to_addr_param(&addr->a, &rawaddr);
264 memcpy(addrparms.v, &rawaddr, len);
266 addrparms_len += len;
270 *addrs_len = addrparms_len;
275 * Create an address list out of the raw address list format (IPv4 and IPv6
276 * address parameters).
278 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
279 int addrs_len, __u16 port, gfp_t gfp)
281 union sctp_addr_param *rawaddr;
282 struct sctp_paramhdr *param;
283 union sctp_addr addr;
288 /* Convert the raw address to standard address format */
290 param = (struct sctp_paramhdr *)raw_addr_list;
291 rawaddr = (union sctp_addr_param *)raw_addr_list;
293 af = sctp_get_af_specific(param_type2af(param->type));
296 sctp_bind_addr_clean(bp);
300 af->from_addr_param(&addr, rawaddr, htons(port), 0);
301 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
303 /* Can't finish building the list, clean up. */
304 sctp_bind_addr_clean(bp);
308 len = ntohs(param->length);
310 raw_addr_list += len;
316 /********************************************************************
317 * 2nd Level Abstractions
318 ********************************************************************/
320 /* Does this contain a specified address? Allow wildcarding. */
321 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
322 const union sctp_addr *addr,
323 struct sctp_sock *opt)
325 struct sctp_sockaddr_entry *laddr;
329 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
332 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
342 /* Does the address 'addr' conflict with any addresses in
345 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
346 const union sctp_addr *addr,
347 struct sctp_sock *bp_sp,
348 struct sctp_sock *addr_sp)
350 struct sctp_sockaddr_entry *laddr;
352 struct sctp_sock *sp;
354 /* Pick the IPv6 socket as the basis of comparison
355 * since it's usually a superset of the IPv4.
356 * If there is no IPv6 socket, then default to bind_addr.
358 if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
360 else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
366 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
370 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
379 /* Get the state of the entry in the bind_addr_list */
380 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
381 const union sctp_addr *addr)
383 struct sctp_sockaddr_entry *laddr;
387 af = sctp_get_af_specific(addr->sa.sa_family);
392 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
395 if (af->cmp_addr(&laddr->a, addr)) {
396 state = laddr->state;
405 /* Find the first address in the bind address list that is not present in
406 * the addrs packed array.
408 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
409 const union sctp_addr *addrs,
411 struct sctp_sock *opt)
413 struct sctp_sockaddr_entry *laddr;
414 union sctp_addr *addr;
419 /* This is only called sctp_send_asconf_del_ip() and we hold
420 * the socket lock in that code patch, so that address list
423 list_for_each_entry(laddr, &bp->address_list, list) {
424 addr_buf = (union sctp_addr *)addrs;
425 for (i = 0; i < addrcnt; i++) {
427 af = sctp_get_af_specific(addr->v4.sin_family);
431 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
434 addr_buf += af->sockaddr_len;
443 /* Copy out addresses from the global local address list. */
444 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
445 union sctp_addr *addr,
446 sctp_scope_t scope, gfp_t gfp,
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_PEERSUPP))) ||
460 (((AF_INET6 == addr->sa.sa_family) &&
461 (flags & SCTP_ADDR6_ALLOWED) &&
462 (flags & SCTP_ADDR6_PEERSUPP))))
463 error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
470 /* Is this a wildcard address? */
471 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
473 unsigned short fam = 0;
476 /* Try to get the right address family */
477 if (addr->sa.sa_family != AF_UNSPEC)
478 fam = addr->sa.sa_family;
482 af = sctp_get_af_specific(fam);
486 return af->is_any(addr);
489 /* Is 'addr' valid for 'scope'? */
490 int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope)
492 sctp_scope_t addr_scope = sctp_scope(addr);
494 /* The unusable SCTP addresses will not be considered with
495 * any defined scopes.
497 if (SCTP_SCOPE_UNUSABLE == addr_scope)
500 * For INIT and INIT-ACK address list, let L be the level of
501 * of requested destination address, sender and receiver
502 * SHOULD include all of its addresses with level greater
503 * than or equal to L.
505 * Address scoping can be selectively controlled via sysctl
508 switch (net->sctp.scope_policy) {
509 case SCTP_SCOPE_POLICY_DISABLE:
511 case SCTP_SCOPE_POLICY_ENABLE:
512 if (addr_scope <= scope)
515 case SCTP_SCOPE_POLICY_PRIVATE:
516 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
519 case SCTP_SCOPE_POLICY_LINK:
520 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
530 int sctp_is_ep_boundall(struct sock *sk)
532 struct sctp_bind_addr *bp;
533 struct sctp_sockaddr_entry *addr;
535 bp = &sctp_sk(sk)->ep->base.bind_addr;
536 if (sctp_list_single_entry(&bp->address_list)) {
537 addr = list_entry(bp->address_list.next,
538 struct sctp_sockaddr_entry, list);
539 if (sctp_is_any(sk, &addr->a))
545 /********************************************************************
546 * 3rd Level Abstractions
547 ********************************************************************/
549 /* What is the scope of 'addr'? */
550 sctp_scope_t sctp_scope(const union sctp_addr *addr)
554 af = sctp_get_af_specific(addr->sa.sa_family);
556 return SCTP_SCOPE_UNUSABLE;
558 return af->scope((union sctp_addr *)addr);