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, 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 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;
71 struct list_head *pos;
74 /* All addresses share the same port. */
75 dest->port = src->port;
77 /* Extract the addresses which are relevant for this scope. */
78 list_for_each(pos, &src->address_list) {
79 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
80 error = sctp_copy_one_addr(dest, &addr->a_h, scope,
86 /* If there are no addresses matching the scope and
87 * this is global scope, try to get a link scope address, with
88 * the assumption that we must be sitting behind a NAT.
90 if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
91 list_for_each(pos, &src->address_list) {
92 addr = list_entry(pos, struct sctp_sockaddr_entry,
94 error = sctp_copy_one_addr(dest, &addr->a_h,
104 sctp_bind_addr_clean(dest);
109 /* Initialize the SCTP_bind_addr structure for either an endpoint or
112 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
116 INIT_LIST_HEAD(&bp->address_list);
120 /* Dispose of the address list. */
121 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
123 struct sctp_sockaddr_entry *addr;
124 struct list_head *pos, *temp;
126 /* Empty the bind address list. */
127 list_for_each_safe(pos, temp, &bp->address_list) {
128 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
131 SCTP_DBG_OBJCNT_DEC(addr);
135 /* Dispose of an SCTP_bind_addr structure */
136 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
138 /* Empty the bind address list. */
139 sctp_bind_addr_clean(bp);
143 SCTP_DBG_OBJCNT_DEC(bind_addr);
147 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
148 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
149 __u8 use_as_src, gfp_t gfp)
151 struct sctp_sockaddr_entry *addr;
153 /* Add the address to the bind address list. */
154 addr = t_new(struct sctp_sockaddr_entry, gfp);
158 memcpy(&addr->a, new, sizeof(*new));
160 /* Fix up the port if it has not yet been set.
161 * Both v4 and v6 have the port at the same offset.
163 if (!addr->a.v4.sin_port)
164 addr->a.v4.sin_port = htons(bp->port);
166 flip_to_h(&addr->a_h, &addr->a);
168 addr->use_as_src = use_as_src;
170 INIT_LIST_HEAD(&addr->list);
171 list_add_tail(&addr->list, &bp->address_list);
172 SCTP_DBG_OBJCNT_INC(addr);
177 /* Delete an address from the bind address list in the SCTP_bind_addr
180 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
182 struct list_head *pos, *temp;
183 struct sctp_sockaddr_entry *addr;
185 list_for_each_safe(pos, temp, &bp->address_list) {
186 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
187 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
188 /* Found the exact match. */
191 SCTP_DBG_OBJCNT_DEC(addr);
200 /* Create a network byte-order representation of all the addresses
201 * formated as SCTP parameters.
203 * The second argument is the return value for the length.
205 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
209 union sctp_params addrparms;
210 union sctp_params retval;
212 union sctp_addr_param rawaddr;
214 struct sctp_sockaddr_entry *addr;
215 struct list_head *pos;
221 /* Allocate enough memory at once. */
222 list_for_each(pos, &bp->address_list) {
223 len += sizeof(union sctp_addr_param);
226 /* Don't even bother embedding an address if there
229 if (len == sizeof(union sctp_addr_param)) {
234 retval.v = kmalloc(len, gfp);
240 list_for_each(pos, &bp->address_list) {
241 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
242 af = sctp_get_af_specific(addr->a_h.v4.sin_family);
243 len = af->to_addr_param(&addr->a_h, &rawaddr);
244 memcpy(addrparms.v, &rawaddr, len);
246 addrparms_len += len;
250 *addrs_len = addrparms_len;
255 * Create an address list out of the raw address list format (IPv4 and IPv6
256 * address parameters).
258 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
259 int addrs_len, __u16 port, gfp_t gfp)
261 union sctp_addr_param *rawaddr;
262 struct sctp_paramhdr *param;
263 union sctp_addr addr;
269 /* Convert the raw address to standard address format */
271 param = (struct sctp_paramhdr *)raw_addr_list;
272 rawaddr = (union sctp_addr_param *)raw_addr_list;
274 af = sctp_get_af_specific(param_type2af(param->type));
277 sctp_bind_addr_clean(bp);
281 af->from_addr_param(&addr, rawaddr, port, 0);
282 flip_to_n(&tmp, &addr);
283 retval = sctp_add_bind_addr(bp, &tmp, 1, gfp);
285 /* Can't finish building the list, clean up. */
286 sctp_bind_addr_clean(bp);
290 len = ntohs(param->length);
292 raw_addr_list += len;
298 /********************************************************************
299 * 2nd Level Abstractions
300 ********************************************************************/
302 /* Does this contain a specified address? Allow wildcarding. */
303 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
304 const union sctp_addr *addr,
305 struct sctp_sock *opt)
307 struct sctp_sockaddr_entry *laddr;
308 struct list_head *pos;
310 list_for_each(pos, &bp->address_list) {
311 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
312 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
319 /* Find the first address in the bind address list that is not present in
320 * the addrs packed array.
322 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
323 const union sctp_addr *addrs,
325 struct sctp_sock *opt)
327 struct sctp_sockaddr_entry *laddr;
328 union sctp_addr *addr;
331 struct list_head *pos;
334 list_for_each(pos, &bp->address_list) {
335 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
337 addr_buf = (union sctp_addr *)addrs;
338 for (i = 0; i < addrcnt; i++) {
339 addr = (union sctp_addr *)addr_buf;
340 af = sctp_get_af_specific(addr->v4.sin_family);
344 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
347 addr_buf += af->sockaddr_len;
356 /* Copy out addresses from the global local address list. */
357 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
358 union sctp_addr *addr,
359 sctp_scope_t scope, gfp_t gfp,
364 flip_to_n(&tmp, addr);
366 if (sctp_is_any(addr)) {
367 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
368 } else if (sctp_in_scope(addr, scope)) {
369 /* Now that the address is in scope, check to see if
370 * the address type is supported by local sock as
371 * well as the remote peer.
373 if ((((AF_INET == addr->sa.sa_family) &&
374 (flags & SCTP_ADDR4_PEERSUPP))) ||
375 (((AF_INET6 == addr->sa.sa_family) &&
376 (flags & SCTP_ADDR6_ALLOWED) &&
377 (flags & SCTP_ADDR6_PEERSUPP))))
378 error = sctp_add_bind_addr(dest, &tmp, 1, gfp);
384 /* Is this a wildcard address? */
385 int sctp_is_any(const union sctp_addr *addr)
387 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
390 return af->is_any(addr);
393 /* Is 'addr' valid for 'scope'? */
394 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
396 sctp_scope_t addr_scope = sctp_scope(addr);
398 /* The unusable SCTP addresses will not be considered with
399 * any defined scopes.
401 if (SCTP_SCOPE_UNUSABLE == addr_scope)
404 * For INIT and INIT-ACK address list, let L be the level of
405 * of requested destination address, sender and receiver
406 * SHOULD include all of its addresses with level greater
407 * than or equal to L.
409 if (addr_scope <= scope)
415 /********************************************************************
416 * 3rd Level Abstractions
417 ********************************************************************/
419 /* What is the scope of 'addr'? */
420 sctp_scope_t sctp_scope(const union sctp_addr *addr)
424 af = sctp_get_af_specific(addr->sa.sa_family);
426 return SCTP_SCOPE_UNUSABLE;
428 return af->scope((union sctp_addr *)addr);