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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
6 *
7 * This file is part of the SCTP kernel reference implementation.
8 *
9 * A collection class to handle the storage of transport addresses.
10 *
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)
15 * any later version.
16 *
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.
22 *
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.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
31 *
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
34 *
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>
40 *
41 * Any bugs reported given to us we will try to fix... any fixes shared will
42 * be incorporated into the next SCTP release.
43 */
44
45#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/in.h>
47#include <net/sock.h>
48#include <net/ipv6.h>
49#include <net/if_inet6.h>
50#include <net/sctp/sctp.h>
51#include <net/sctp/sm.h>
52
53/* Forward declarations for internal helpers. */
54static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
Al Virodd0fc662005-10-07 07:46:04 +010055 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070056 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static void sctp_bind_addr_clean(struct sctp_bind_addr *);
58
59/* First Level Abstractions. */
60
61/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
62 * in 'src' which have a broader scope than 'scope'.
63 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090064int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 const struct sctp_bind_addr *src,
Al Virodd0fc662005-10-07 07:46:04 +010066 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070067 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 struct sctp_sockaddr_entry *addr;
70 struct list_head *pos;
71 int error = 0;
72
73 /* All addresses share the same port. */
74 dest->port = src->port;
75
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);
Al Viro02a8a4d2006-11-20 17:12:07 -080079 error = sctp_copy_one_addr(dest, &addr->a, scope,
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 gfp, flags);
81 if (error < 0)
82 goto out;
83 }
84
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.
88 */
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,
92 list);
Al Viro02a8a4d2006-11-20 17:12:07 -080093 error = sctp_copy_one_addr(dest, &addr->a,
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 SCTP_SCOPE_LINK, gfp,
95 flags);
96 if (error < 0)
97 goto out;
98 }
99 }
100
101out:
102 if (error)
103 sctp_bind_addr_clean(dest);
104
105 return error;
106}
107
108/* Initialize the SCTP_bind_addr structure for either an endpoint or
109 * an association.
110 */
111void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
112{
113 bp->malloced = 0;
114
115 INIT_LIST_HEAD(&bp->address_list);
116 bp->port = port;
117}
118
119/* Dispose of the address list. */
120static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
121{
122 struct sctp_sockaddr_entry *addr;
123 struct list_head *pos, *temp;
124
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);
128 list_del(pos);
129 kfree(addr);
130 SCTP_DBG_OBJCNT_DEC(addr);
131 }
132}
133
134/* Dispose of an SCTP_bind_addr structure */
135void sctp_bind_addr_free(struct sctp_bind_addr *bp)
136{
137 /* Empty the bind address list. */
138 sctp_bind_addr_clean(bp);
139
140 if (bp->malloced) {
141 kfree(bp);
142 SCTP_DBG_OBJCNT_DEC(bind_addr);
143 }
144}
145
146/* Add an address to the bind address list in the SCTP_bind_addr structure. */
147int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700148 __u8 use_as_src, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct sctp_sockaddr_entry *addr;
151
152 /* Add the address to the bind address list. */
153 addr = t_new(struct sctp_sockaddr_entry, gfp);
154 if (!addr)
155 return -ENOMEM;
156
Al Viro5ab7b852006-11-20 17:10:38 -0800157 memcpy(&addr->a, new, sizeof(*new));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 /* Fix up the port if it has not yet been set.
160 * Both v4 and v6 have the port at the same offset.
161 */
Al Viro5ab7b852006-11-20 17:10:38 -0800162 if (!addr->a.v4.sin_port)
163 addr->a.v4.sin_port = htons(bp->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700165 addr->use_as_src = use_as_src;
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 INIT_LIST_HEAD(&addr->list);
168 list_add_tail(&addr->list, &bp->address_list);
169 SCTP_DBG_OBJCNT_INC(addr);
170
171 return 0;
172}
173
174/* Delete an address from the bind address list in the SCTP_bind_addr
175 * structure.
176 */
177int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
178{
179 struct list_head *pos, *temp;
180 struct sctp_sockaddr_entry *addr;
181
182 list_for_each_safe(pos, temp, &bp->address_list) {
183 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
Al Viroc9a08502006-11-20 17:07:48 -0800184 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /* Found the exact match. */
186 list_del(pos);
187 kfree(addr);
188 SCTP_DBG_OBJCNT_DEC(addr);
189
190 return 0;
191 }
192 }
193
194 return -EINVAL;
195}
196
197/* Create a network byte-order representation of all the addresses
198 * formated as SCTP parameters.
199 *
200 * The second argument is the return value for the length.
201 */
202union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700203 int *addrs_len,
Al Virodd0fc662005-10-07 07:46:04 +0100204 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 union sctp_params addrparms;
207 union sctp_params retval;
208 int addrparms_len;
209 union sctp_addr_param rawaddr;
210 int len;
211 struct sctp_sockaddr_entry *addr;
212 struct list_head *pos;
213 struct sctp_af *af;
214
215 addrparms_len = 0;
216 len = 0;
217
218 /* Allocate enough memory at once. */
219 list_for_each(pos, &bp->address_list) {
220 len += sizeof(union sctp_addr_param);
221 }
222
223 /* Don't even bother embedding an address if there
224 * is only one.
225 */
226 if (len == sizeof(union sctp_addr_param)) {
227 retval.v = NULL;
228 goto end_raw;
229 }
230
231 retval.v = kmalloc(len, gfp);
232 if (!retval.v)
233 goto end_raw;
234
235 addrparms = retval;
236
237 list_for_each(pos, &bp->address_list) {
238 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
Al Viro6244be42006-11-20 17:21:44 -0800239 af = sctp_get_af_specific(addr->a.v4.sin_family);
240 len = af->to_addr_param(&addr->a, &rawaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 memcpy(addrparms.v, &rawaddr, len);
242 addrparms.v += len;
243 addrparms_len += len;
244 }
245
246end_raw:
247 *addrs_len = addrparms_len;
248 return retval;
249}
250
251/*
252 * Create an address list out of the raw address list format (IPv4 and IPv6
253 * address parameters).
254 */
255int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
Al Virodd0fc662005-10-07 07:46:04 +0100256 int addrs_len, __u16 port, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
258 union sctp_addr_param *rawaddr;
259 struct sctp_paramhdr *param;
260 union sctp_addr addr;
261 int retval = 0;
262 int len;
263 struct sctp_af *af;
264
265 /* Convert the raw address to standard address format */
266 while (addrs_len) {
267 param = (struct sctp_paramhdr *)raw_addr_list;
268 rawaddr = (union sctp_addr_param *)raw_addr_list;
269
270 af = sctp_get_af_specific(param_type2af(param->type));
271 if (unlikely(!af)) {
272 retval = -EINVAL;
273 sctp_bind_addr_clean(bp);
274 break;
275 }
276
Al Virodd86d132006-11-20 17:11:13 -0800277 af->from_addr_param(&addr, rawaddr, htons(port), 0);
278 retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (retval) {
280 /* Can't finish building the list, clean up. */
281 sctp_bind_addr_clean(bp);
282 break;
283 }
284
285 len = ntohs(param->length);
286 addrs_len -= len;
287 raw_addr_list += len;
288 }
289
290 return retval;
291}
292
293/********************************************************************
294 * 2nd Level Abstractions
295 ********************************************************************/
296
297/* Does this contain a specified address? Allow wildcarding. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900298int sctp_bind_addr_match(struct sctp_bind_addr *bp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 const union sctp_addr *addr,
300 struct sctp_sock *opt)
301{
302 struct sctp_sockaddr_entry *laddr;
303 struct list_head *pos;
304
305 list_for_each(pos, &bp->address_list) {
306 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
Al Viro7e1e4a22006-11-20 17:05:43 -0800307 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900308 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 }
310
311 return 0;
312}
313
314/* Find the first address in the bind address list that is not present in
315 * the addrs packed array.
316 */
317union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
318 const union sctp_addr *addrs,
319 int addrcnt,
320 struct sctp_sock *opt)
321{
322 struct sctp_sockaddr_entry *laddr;
323 union sctp_addr *addr;
324 void *addr_buf;
325 struct sctp_af *af;
326 struct list_head *pos;
327 int i;
328
329 list_for_each(pos, &bp->address_list) {
330 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 addr_buf = (union sctp_addr *)addrs;
333 for (i = 0; i < addrcnt; i++) {
334 addr = (union sctp_addr *)addr_buf;
335 af = sctp_get_af_specific(addr->v4.sin_family);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900336 if (!af)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return NULL;
338
Al Viro5f242a12006-11-20 17:05:23 -0800339 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 break;
341
342 addr_buf += af->sockaddr_len;
343 }
344 if (i == addrcnt)
Al Viro5ae955c2006-11-20 17:22:08 -0800345 return &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
347
348 return NULL;
349}
350
351/* Copy out addresses from the global local address list. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900352static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 union sctp_addr *addr,
Al Virodd0fc662005-10-07 07:46:04 +0100354 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700355 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357 int error = 0;
358
359 if (sctp_is_any(addr)) {
360 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
361 } else if (sctp_in_scope(addr, scope)) {
362 /* Now that the address is in scope, check to see if
363 * the address type is supported by local sock as
364 * well as the remote peer.
365 */
366 if ((((AF_INET == addr->sa.sa_family) &&
367 (flags & SCTP_ADDR4_PEERSUPP))) ||
368 (((AF_INET6 == addr->sa.sa_family) &&
369 (flags & SCTP_ADDR6_ALLOWED) &&
370 (flags & SCTP_ADDR6_PEERSUPP))))
Al Viro02a8a4d2006-11-20 17:12:07 -0800371 error = sctp_add_bind_addr(dest, addr, 1, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 }
373
374 return error;
375}
376
377/* Is this a wildcard address? */
378int sctp_is_any(const union sctp_addr *addr)
379{
380 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
381 if (!af)
382 return 0;
383 return af->is_any(addr);
384}
385
386/* Is 'addr' valid for 'scope'? */
387int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
388{
389 sctp_scope_t addr_scope = sctp_scope(addr);
390
391 /* The unusable SCTP addresses will not be considered with
392 * any defined scopes.
393 */
394 if (SCTP_SCOPE_UNUSABLE == addr_scope)
395 return 0;
396 /*
397 * For INIT and INIT-ACK address list, let L be the level of
398 * of requested destination address, sender and receiver
399 * SHOULD include all of its addresses with level greater
400 * than or equal to L.
401 */
402 if (addr_scope <= scope)
403 return 1;
404
405 return 0;
406}
407
408/********************************************************************
409 * 3rd Level Abstractions
410 ********************************************************************/
411
412/* What is the scope of 'addr'? */
413sctp_scope_t sctp_scope(const union sctp_addr *addr)
414{
415 struct sctp_af *af;
416
417 af = sctp_get_af_specific(addr->sa.sa_family);
418 if (!af)
419 return SCTP_SCOPE_UNUSABLE;
420
421 return af->scope((union sctp_addr *)addr);
422}