1 /* SCTP kernel reference 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 reference implementation.
9 * A collection class to handle the storage of transport addresses.
11 * The SCTP reference 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 * The SCTP reference 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/sched.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 sctp_bind_addr *, union sctp_addr *,
56 sctp_scope_t scope, int gfp, int flags);
57 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
59 /* First Level Abstractions. */
61 /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
62 * in 'src' which have a broader scope than 'scope'.
64 int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
65 const struct sctp_bind_addr *src,
66 sctp_scope_t scope, int gfp, int flags)
68 struct sctp_sockaddr_entry *addr;
69 struct list_head *pos;
72 /* All addresses share the same port. */
73 dest->port = src->port;
75 /* Extract the addresses which are relevant for this scope. */
76 list_for_each(pos, &src->address_list) {
77 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
78 error = sctp_copy_one_addr(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(pos, &src->address_list) {
90 addr = list_entry(pos, struct sctp_sockaddr_entry,
92 error = sctp_copy_one_addr(dest, &addr->a,
102 sctp_bind_addr_clean(dest);
107 /* Create a new SCTP_bind_addr from nothing. */
108 struct sctp_bind_addr *sctp_bind_addr_new(int gfp)
110 struct sctp_bind_addr *retval;
112 retval = t_new(struct sctp_bind_addr, gfp);
116 sctp_bind_addr_init(retval, 0);
117 retval->malloced = 1;
118 SCTP_DBG_OBJCNT_INC(bind_addr);
124 /* Initialize the SCTP_bind_addr structure for either an endpoint or
127 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
131 INIT_LIST_HEAD(&bp->address_list);
135 /* Dispose of the address list. */
136 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
138 struct sctp_sockaddr_entry *addr;
139 struct list_head *pos, *temp;
141 /* Empty the bind address list. */
142 list_for_each_safe(pos, temp, &bp->address_list) {
143 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
146 SCTP_DBG_OBJCNT_DEC(addr);
150 /* Dispose of an SCTP_bind_addr structure */
151 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
153 /* Empty the bind address list. */
154 sctp_bind_addr_clean(bp);
158 SCTP_DBG_OBJCNT_DEC(bind_addr);
162 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
163 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
166 struct sctp_sockaddr_entry *addr;
168 /* Add the address to the bind address list. */
169 addr = t_new(struct sctp_sockaddr_entry, gfp);
173 memcpy(&addr->a, new, sizeof(*new));
175 /* Fix up the port if it has not yet been set.
176 * Both v4 and v6 have the port at the same offset.
178 if (!addr->a.v4.sin_port)
179 addr->a.v4.sin_port = bp->port;
181 INIT_LIST_HEAD(&addr->list);
182 list_add_tail(&addr->list, &bp->address_list);
183 SCTP_DBG_OBJCNT_INC(addr);
188 /* Delete an address from the bind address list in the SCTP_bind_addr
191 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
193 struct list_head *pos, *temp;
194 struct sctp_sockaddr_entry *addr;
196 list_for_each_safe(pos, temp, &bp->address_list) {
197 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
198 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
199 /* Found the exact match. */
202 SCTP_DBG_OBJCNT_DEC(addr);
211 /* Create a network byte-order representation of all the addresses
212 * formated as SCTP parameters.
214 * The second argument is the return value for the length.
216 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
217 int *addrs_len, int gfp)
219 union sctp_params addrparms;
220 union sctp_params retval;
222 union sctp_addr_param rawaddr;
224 struct sctp_sockaddr_entry *addr;
225 struct list_head *pos;
231 /* Allocate enough memory at once. */
232 list_for_each(pos, &bp->address_list) {
233 len += sizeof(union sctp_addr_param);
236 /* Don't even bother embedding an address if there
239 if (len == sizeof(union sctp_addr_param)) {
244 retval.v = kmalloc(len, gfp);
250 list_for_each(pos, &bp->address_list) {
251 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
252 af = sctp_get_af_specific(addr->a.v4.sin_family);
253 len = af->to_addr_param(&addr->a, &rawaddr);
254 memcpy(addrparms.v, &rawaddr, len);
256 addrparms_len += len;
260 *addrs_len = addrparms_len;
265 * Create an address list out of the raw address list format (IPv4 and IPv6
266 * address parameters).
268 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
269 int addrs_len, __u16 port, int gfp)
271 union sctp_addr_param *rawaddr;
272 struct sctp_paramhdr *param;
273 union sctp_addr addr;
278 /* Convert the raw address to standard address format */
280 param = (struct sctp_paramhdr *)raw_addr_list;
281 rawaddr = (union sctp_addr_param *)raw_addr_list;
283 af = sctp_get_af_specific(param_type2af(param->type));
286 sctp_bind_addr_clean(bp);
290 af->from_addr_param(&addr, rawaddr, port, 0);
291 retval = sctp_add_bind_addr(bp, &addr, gfp);
293 /* Can't finish building the list, clean up. */
294 sctp_bind_addr_clean(bp);
298 len = ntohs(param->length);
300 raw_addr_list += len;
306 /********************************************************************
307 * 2nd Level Abstractions
308 ********************************************************************/
310 /* Does this contain a specified address? Allow wildcarding. */
311 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
312 const union sctp_addr *addr,
313 struct sctp_opt *opt)
315 struct sctp_sockaddr_entry *laddr;
316 struct list_head *pos;
318 list_for_each(pos, &bp->address_list) {
319 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
320 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
327 /* Find the first address in the bind address list that is not present in
328 * the addrs packed array.
330 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
331 const union sctp_addr *addrs,
333 struct sctp_opt *opt)
335 struct sctp_sockaddr_entry *laddr;
336 union sctp_addr *addr;
339 struct list_head *pos;
342 list_for_each(pos, &bp->address_list) {
343 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
345 addr_buf = (union sctp_addr *)addrs;
346 for (i = 0; i < addrcnt; i++) {
347 addr = (union sctp_addr *)addr_buf;
348 af = sctp_get_af_specific(addr->v4.sin_family);
352 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
355 addr_buf += af->sockaddr_len;
364 /* Copy out addresses from the global local address list. */
365 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
366 union sctp_addr *addr,
367 sctp_scope_t scope, int gfp, int flags)
371 if (sctp_is_any(addr)) {
372 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
373 } else if (sctp_in_scope(addr, scope)) {
374 /* Now that the address is in scope, check to see if
375 * the address type is supported by local sock as
376 * well as the remote peer.
378 if ((((AF_INET == addr->sa.sa_family) &&
379 (flags & SCTP_ADDR4_PEERSUPP))) ||
380 (((AF_INET6 == addr->sa.sa_family) &&
381 (flags & SCTP_ADDR6_ALLOWED) &&
382 (flags & SCTP_ADDR6_PEERSUPP))))
383 error = sctp_add_bind_addr(dest, addr, gfp);
389 /* Is this a wildcard address? */
390 int sctp_is_any(const union sctp_addr *addr)
392 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
395 return af->is_any(addr);
398 /* Is 'addr' valid for 'scope'? */
399 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
401 sctp_scope_t addr_scope = sctp_scope(addr);
403 /* The unusable SCTP addresses will not be considered with
404 * any defined scopes.
406 if (SCTP_SCOPE_UNUSABLE == addr_scope)
409 * For INIT and INIT-ACK address list, let L be the level of
410 * of requested destination address, sender and receiver
411 * SHOULD include all of its addresses with level greater
412 * than or equal to L.
414 if (addr_scope <= scope)
420 /********************************************************************
421 * 3rd Level Abstractions
422 ********************************************************************/
424 /* What is the scope of 'addr'? */
425 sctp_scope_t sctp_scope(const union sctp_addr *addr)
429 af = sctp_get_af_specific(addr->sa.sa_family);
431 return SCTP_SCOPE_UNUSABLE;
433 return af->scope((union sctp_addr *)addr);