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 /* Initialize the SCTP_bind_addr structure for either an endpoint or
110 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
114 INIT_LIST_HEAD(&bp->address_list);
118 /* Dispose of the address list. */
119 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
121 struct sctp_sockaddr_entry *addr;
122 struct list_head *pos, *temp;
124 /* Empty the bind address list. */
125 list_for_each_safe(pos, temp, &bp->address_list) {
126 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
129 SCTP_DBG_OBJCNT_DEC(addr);
133 /* Dispose of an SCTP_bind_addr structure */
134 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
136 /* Empty the bind address list. */
137 sctp_bind_addr_clean(bp);
141 SCTP_DBG_OBJCNT_DEC(bind_addr);
145 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
146 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
149 struct sctp_sockaddr_entry *addr;
151 /* Add the address to the bind address list. */
152 addr = t_new(struct sctp_sockaddr_entry, gfp);
156 memcpy(&addr->a, new, sizeof(*new));
158 /* Fix up the port if it has not yet been set.
159 * Both v4 and v6 have the port at the same offset.
161 if (!addr->a.v4.sin_port)
162 addr->a.v4.sin_port = bp->port;
164 INIT_LIST_HEAD(&addr->list);
165 list_add_tail(&addr->list, &bp->address_list);
166 SCTP_DBG_OBJCNT_INC(addr);
171 /* Delete an address from the bind address list in the SCTP_bind_addr
174 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
176 struct list_head *pos, *temp;
177 struct sctp_sockaddr_entry *addr;
179 list_for_each_safe(pos, temp, &bp->address_list) {
180 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
181 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
182 /* Found the exact match. */
185 SCTP_DBG_OBJCNT_DEC(addr);
194 /* Create a network byte-order representation of all the addresses
195 * formated as SCTP parameters.
197 * The second argument is the return value for the length.
199 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
200 int *addrs_len, int gfp)
202 union sctp_params addrparms;
203 union sctp_params retval;
205 union sctp_addr_param rawaddr;
207 struct sctp_sockaddr_entry *addr;
208 struct list_head *pos;
214 /* Allocate enough memory at once. */
215 list_for_each(pos, &bp->address_list) {
216 len += sizeof(union sctp_addr_param);
219 /* Don't even bother embedding an address if there
222 if (len == sizeof(union sctp_addr_param)) {
227 retval.v = kmalloc(len, gfp);
233 list_for_each(pos, &bp->address_list) {
234 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
235 af = sctp_get_af_specific(addr->a.v4.sin_family);
236 len = af->to_addr_param(&addr->a, &rawaddr);
237 memcpy(addrparms.v, &rawaddr, len);
239 addrparms_len += len;
243 *addrs_len = addrparms_len;
248 * Create an address list out of the raw address list format (IPv4 and IPv6
249 * address parameters).
251 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
252 int addrs_len, __u16 port, int gfp)
254 union sctp_addr_param *rawaddr;
255 struct sctp_paramhdr *param;
256 union sctp_addr addr;
261 /* Convert the raw address to standard address format */
263 param = (struct sctp_paramhdr *)raw_addr_list;
264 rawaddr = (union sctp_addr_param *)raw_addr_list;
266 af = sctp_get_af_specific(param_type2af(param->type));
269 sctp_bind_addr_clean(bp);
273 af->from_addr_param(&addr, rawaddr, port, 0);
274 retval = sctp_add_bind_addr(bp, &addr, gfp);
276 /* Can't finish building the list, clean up. */
277 sctp_bind_addr_clean(bp);
281 len = ntohs(param->length);
283 raw_addr_list += len;
289 /********************************************************************
290 * 2nd Level Abstractions
291 ********************************************************************/
293 /* Does this contain a specified address? Allow wildcarding. */
294 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
295 const union sctp_addr *addr,
296 struct sctp_sock *opt)
298 struct sctp_sockaddr_entry *laddr;
299 struct list_head *pos;
301 list_for_each(pos, &bp->address_list) {
302 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
303 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
310 /* Find the first address in the bind address list that is not present in
311 * the addrs packed array.
313 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
314 const union sctp_addr *addrs,
316 struct sctp_sock *opt)
318 struct sctp_sockaddr_entry *laddr;
319 union sctp_addr *addr;
322 struct list_head *pos;
325 list_for_each(pos, &bp->address_list) {
326 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
328 addr_buf = (union sctp_addr *)addrs;
329 for (i = 0; i < addrcnt; i++) {
330 addr = (union sctp_addr *)addr_buf;
331 af = sctp_get_af_specific(addr->v4.sin_family);
335 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
338 addr_buf += af->sockaddr_len;
347 /* Copy out addresses from the global local address list. */
348 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
349 union sctp_addr *addr,
350 sctp_scope_t scope, int gfp, int flags)
354 if (sctp_is_any(addr)) {
355 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
356 } else if (sctp_in_scope(addr, scope)) {
357 /* Now that the address is in scope, check to see if
358 * the address type is supported by local sock as
359 * well as the remote peer.
361 if ((((AF_INET == addr->sa.sa_family) &&
362 (flags & SCTP_ADDR4_PEERSUPP))) ||
363 (((AF_INET6 == addr->sa.sa_family) &&
364 (flags & SCTP_ADDR6_ALLOWED) &&
365 (flags & SCTP_ADDR6_PEERSUPP))))
366 error = sctp_add_bind_addr(dest, addr, gfp);
372 /* Is this a wildcard address? */
373 int sctp_is_any(const union sctp_addr *addr)
375 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
378 return af->is_any(addr);
381 /* Is 'addr' valid for 'scope'? */
382 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
384 sctp_scope_t addr_scope = sctp_scope(addr);
386 /* The unusable SCTP addresses will not be considered with
387 * any defined scopes.
389 if (SCTP_SCOPE_UNUSABLE == addr_scope)
392 * For INIT and INIT-ACK address list, let L be the level of
393 * of requested destination address, sender and receiver
394 * SHOULD include all of its addresses with level greater
395 * than or equal to L.
397 if (addr_scope <= scope)
403 /********************************************************************
404 * 3rd Level Abstractions
405 ********************************************************************/
407 /* What is the scope of 'addr'? */
408 sctp_scope_t sctp_scope(const union sctp_addr *addr)
412 af = sctp_get_af_specific(addr->sa.sa_family);
414 return SCTP_SCOPE_UNUSABLE;
416 return af->scope((union sctp_addr *)addr);