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>
49 #include <net/if_inet6.h>
50 #include <net/sctp/sctp.h>
51 #include <net/sctp/sm.h>
53 /* Forward declarations for internal helpers. */
54 static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
55 sctp_scope_t scope, gfp_t gfp,
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, gfp_t gfp,
69 struct sctp_sockaddr_entry *addr;
70 struct list_head *pos;
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(pos, &src->address_list) {
78 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
79 error = sctp_copy_one_addr(dest, &addr->a, scope,
85 /* If there are no addresses matching the scope and
86 * this is global scope, try to get a link scope address, with
87 * the assumption that we must be sitting behind a NAT.
89 if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
90 list_for_each(pos, &src->address_list) {
91 addr = list_entry(pos, struct sctp_sockaddr_entry,
93 error = sctp_copy_one_addr(dest, &addr->a,
103 sctp_bind_addr_clean(dest);
108 /* Initialize the SCTP_bind_addr structure for either an endpoint or
111 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
115 INIT_LIST_HEAD(&bp->address_list);
119 /* Dispose of the address list. */
120 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
122 struct sctp_sockaddr_entry *addr;
123 struct list_head *pos, *temp;
125 /* Empty the bind address list. */
126 list_for_each_safe(pos, temp, &bp->address_list) {
127 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
130 SCTP_DBG_OBJCNT_DEC(addr);
134 /* Dispose of an SCTP_bind_addr structure */
135 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
137 /* Empty the bind address list. */
138 sctp_bind_addr_clean(bp);
142 SCTP_DBG_OBJCNT_DEC(bind_addr);
146 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
147 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
148 __u8 use_as_src, gfp_t gfp)
150 struct sctp_sockaddr_entry *addr;
152 /* Add the address to the bind address list. */
153 addr = t_new(struct sctp_sockaddr_entry, gfp);
157 memcpy(&addr->a, new, sizeof(*new));
159 /* Fix up the port if it has not yet been set.
160 * Both v4 and v6 have the port at the same offset.
162 if (!addr->a.v4.sin_port)
163 addr->a.v4.sin_port = htons(bp->port);
165 addr->use_as_src = use_as_src;
168 INIT_LIST_HEAD(&addr->list);
169 INIT_RCU_HEAD(&addr->rcu);
170 list_add_tail(&addr->list, &bp->address_list);
171 SCTP_DBG_OBJCNT_INC(addr);
176 /* Delete an address from the bind address list in the SCTP_bind_addr
179 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
181 struct list_head *pos, *temp;
182 struct sctp_sockaddr_entry *addr;
184 list_for_each_safe(pos, temp, &bp->address_list) {
185 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
186 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
187 /* Found the exact match. */
190 SCTP_DBG_OBJCNT_DEC(addr);
199 /* Create a network byte-order representation of all the addresses
200 * formated as SCTP parameters.
202 * The second argument is the return value for the length.
204 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
208 union sctp_params addrparms;
209 union sctp_params retval;
211 union sctp_addr_param rawaddr;
213 struct sctp_sockaddr_entry *addr;
214 struct list_head *pos;
220 /* Allocate enough memory at once. */
221 list_for_each(pos, &bp->address_list) {
222 len += sizeof(union sctp_addr_param);
225 /* Don't even bother embedding an address if there
228 if (len == sizeof(union sctp_addr_param)) {
233 retval.v = kmalloc(len, gfp);
239 list_for_each(pos, &bp->address_list) {
240 addr = list_entry(pos, struct sctp_sockaddr_entry, 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);
245 addrparms_len += len;
249 *addrs_len = addrparms_len;
254 * Create an address list out of the raw address list format (IPv4 and IPv6
255 * address parameters).
257 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
258 int addrs_len, __u16 port, gfp_t gfp)
260 union sctp_addr_param *rawaddr;
261 struct sctp_paramhdr *param;
262 union sctp_addr addr;
267 /* Convert the raw address to standard address format */
269 param = (struct sctp_paramhdr *)raw_addr_list;
270 rawaddr = (union sctp_addr_param *)raw_addr_list;
272 af = sctp_get_af_specific(param_type2af(param->type));
275 sctp_bind_addr_clean(bp);
279 af->from_addr_param(&addr, rawaddr, htons(port), 0);
280 retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
282 /* Can't finish building the list, clean up. */
283 sctp_bind_addr_clean(bp);
287 len = ntohs(param->length);
289 raw_addr_list += len;
295 /********************************************************************
296 * 2nd Level Abstractions
297 ********************************************************************/
299 /* Does this contain a specified address? Allow wildcarding. */
300 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
301 const union sctp_addr *addr,
302 struct sctp_sock *opt)
304 struct sctp_sockaddr_entry *laddr;
305 struct list_head *pos;
307 list_for_each(pos, &bp->address_list) {
308 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
309 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
316 /* Find the first address in the bind address list that is not present in
317 * the addrs packed array.
319 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
320 const union sctp_addr *addrs,
322 struct sctp_sock *opt)
324 struct sctp_sockaddr_entry *laddr;
325 union sctp_addr *addr;
328 struct list_head *pos;
331 list_for_each(pos, &bp->address_list) {
332 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
334 addr_buf = (union sctp_addr *)addrs;
335 for (i = 0; i < addrcnt; i++) {
336 addr = (union sctp_addr *)addr_buf;
337 af = sctp_get_af_specific(addr->v4.sin_family);
341 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
344 addr_buf += af->sockaddr_len;
353 /* Copy out addresses from the global local address list. */
354 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
355 union sctp_addr *addr,
356 sctp_scope_t scope, gfp_t gfp,
361 if (sctp_is_any(addr)) {
362 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
363 } else if (sctp_in_scope(addr, scope)) {
364 /* Now that the address is in scope, check to see if
365 * the address type is supported by local sock as
366 * well as the remote peer.
368 if ((((AF_INET == addr->sa.sa_family) &&
369 (flags & SCTP_ADDR4_PEERSUPP))) ||
370 (((AF_INET6 == addr->sa.sa_family) &&
371 (flags & SCTP_ADDR6_ALLOWED) &&
372 (flags & SCTP_ADDR6_PEERSUPP))))
373 error = sctp_add_bind_addr(dest, addr, 1, gfp);
379 /* Is this a wildcard address? */
380 int sctp_is_any(const union sctp_addr *addr)
382 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
385 return af->is_any(addr);
388 /* Is 'addr' valid for 'scope'? */
389 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
391 sctp_scope_t addr_scope = sctp_scope(addr);
393 /* The unusable SCTP addresses will not be considered with
394 * any defined scopes.
396 if (SCTP_SCOPE_UNUSABLE == addr_scope)
399 * For INIT and INIT-ACK address list, let L be the level of
400 * of requested destination address, sender and receiver
401 * SHOULD include all of its addresses with level greater
402 * than or equal to L.
404 if (addr_scope <= scope)
410 /********************************************************************
411 * 3rd Level Abstractions
412 ********************************************************************/
414 /* What is the scope of 'addr'? */
415 sctp_scope_t sctp_scope(const union sctp_addr *addr)
419 af = sctp_get_af_specific(addr->sa.sa_family);
421 return SCTP_SCOPE_UNUSABLE;
423 return af->scope((union sctp_addr *)addr);