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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>
46#include <linux/sched.h>
47#include <linux/in.h>
48#include <net/sock.h>
49#include <net/ipv6.h>
50#include <net/if_inet6.h>
51#include <net/sctp/sctp.h>
52#include <net/sctp/sm.h>
53
54/* Forward declarations for internal helpers. */
55static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
Al Virodd0fc662005-10-07 07:46:04 +010056 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -070057 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static void sctp_bind_addr_clean(struct sctp_bind_addr *);
59
60/* First Level Abstractions. */
61
62/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
63 * in 'src' which have a broader scope than 'scope'.
64 */
65int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
66 const struct sctp_bind_addr *src,
Al Virodd0fc662005-10-07 07:46:04 +010067 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -070068 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 struct sctp_sockaddr_entry *addr;
71 struct list_head *pos;
72 int error = 0;
73
74 /* All addresses share the same port. */
75 dest->port = src->port;
76
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, scope,
81 gfp, flags);
82 if (error < 0)
83 goto out;
84 }
85
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.
89 */
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,
93 list);
94 error = sctp_copy_one_addr(dest, &addr->a,
95 SCTP_SCOPE_LINK, gfp,
96 flags);
97 if (error < 0)
98 goto out;
99 }
100 }
101
102out:
103 if (error)
104 sctp_bind_addr_clean(dest);
105
106 return error;
107}
108
109/* Initialize the SCTP_bind_addr structure for either an endpoint or
110 * an association.
111 */
112void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
113{
114 bp->malloced = 0;
115
116 INIT_LIST_HEAD(&bp->address_list);
117 bp->port = port;
118}
119
120/* Dispose of the address list. */
121static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
122{
123 struct sctp_sockaddr_entry *addr;
124 struct list_head *pos, *temp;
125
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);
129 list_del(pos);
130 kfree(addr);
131 SCTP_DBG_OBJCNT_DEC(addr);
132 }
133}
134
135/* Dispose of an SCTP_bind_addr structure */
136void sctp_bind_addr_free(struct sctp_bind_addr *bp)
137{
138 /* Empty the bind address list. */
139 sctp_bind_addr_clean(bp);
140
141 if (bp->malloced) {
142 kfree(bp);
143 SCTP_DBG_OBJCNT_DEC(bind_addr);
144 }
145}
146
147/* Add an address to the bind address list in the SCTP_bind_addr structure. */
148int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700149 __u8 use_as_src, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct sctp_sockaddr_entry *addr;
152
153 /* Add the address to the bind address list. */
154 addr = t_new(struct sctp_sockaddr_entry, gfp);
155 if (!addr)
156 return -ENOMEM;
157
158 memcpy(&addr->a, new, sizeof(*new));
159
160 /* Fix up the port if it has not yet been set.
161 * Both v4 and v6 have the port at the same offset.
162 */
163 if (!addr->a.v4.sin_port)
164 addr->a.v4.sin_port = bp->port;
165
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700166 addr->use_as_src = use_as_src;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 INIT_LIST_HEAD(&addr->list);
169 list_add_tail(&addr->list, &bp->address_list);
170 SCTP_DBG_OBJCNT_INC(addr);
171
172 return 0;
173}
174
175/* Delete an address from the bind address list in the SCTP_bind_addr
176 * structure.
177 */
178int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
179{
180 struct list_head *pos, *temp;
181 struct sctp_sockaddr_entry *addr;
182
183 list_for_each_safe(pos, temp, &bp->address_list) {
184 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
185 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
186 /* Found the exact match. */
187 list_del(pos);
188 kfree(addr);
189 SCTP_DBG_OBJCNT_DEC(addr);
190
191 return 0;
192 }
193 }
194
195 return -EINVAL;
196}
197
198/* Create a network byte-order representation of all the addresses
199 * formated as SCTP parameters.
200 *
201 * The second argument is the return value for the length.
202 */
203union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -0700204 int *addrs_len,
Al Virodd0fc662005-10-07 07:46:04 +0100205 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
207 union sctp_params addrparms;
208 union sctp_params retval;
209 int addrparms_len;
210 union sctp_addr_param rawaddr;
211 int len;
212 struct sctp_sockaddr_entry *addr;
213 struct list_head *pos;
214 struct sctp_af *af;
215
216 addrparms_len = 0;
217 len = 0;
218
219 /* Allocate enough memory at once. */
220 list_for_each(pos, &bp->address_list) {
221 len += sizeof(union sctp_addr_param);
222 }
223
224 /* Don't even bother embedding an address if there
225 * is only one.
226 */
227 if (len == sizeof(union sctp_addr_param)) {
228 retval.v = NULL;
229 goto end_raw;
230 }
231
232 retval.v = kmalloc(len, gfp);
233 if (!retval.v)
234 goto end_raw;
235
236 addrparms = retval;
237
238 list_for_each(pos, &bp->address_list) {
239 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
240 af = sctp_get_af_specific(addr->a.v4.sin_family);
241 len = af->to_addr_param(&addr->a, &rawaddr);
242 memcpy(addrparms.v, &rawaddr, len);
243 addrparms.v += len;
244 addrparms_len += len;
245 }
246
247end_raw:
248 *addrs_len = addrparms_len;
249 return retval;
250}
251
252/*
253 * Create an address list out of the raw address list format (IPv4 and IPv6
254 * address parameters).
255 */
256int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
Al Virodd0fc662005-10-07 07:46:04 +0100257 int addrs_len, __u16 port, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
259 union sctp_addr_param *rawaddr;
260 struct sctp_paramhdr *param;
261 union sctp_addr addr;
262 int retval = 0;
263 int len;
264 struct sctp_af *af;
265
266 /* Convert the raw address to standard address format */
267 while (addrs_len) {
268 param = (struct sctp_paramhdr *)raw_addr_list;
269 rawaddr = (union sctp_addr_param *)raw_addr_list;
270
271 af = sctp_get_af_specific(param_type2af(param->type));
272 if (unlikely(!af)) {
273 retval = -EINVAL;
274 sctp_bind_addr_clean(bp);
275 break;
276 }
277
278 af->from_addr_param(&addr, rawaddr, port, 0);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700279 retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (retval) {
281 /* Can't finish building the list, clean up. */
282 sctp_bind_addr_clean(bp);
283 break;
284 }
285
286 len = ntohs(param->length);
287 addrs_len -= len;
288 raw_addr_list += len;
289 }
290
291 return retval;
292}
293
294/********************************************************************
295 * 2nd Level Abstractions
296 ********************************************************************/
297
298/* Does this contain a specified address? Allow wildcarding. */
299int sctp_bind_addr_match(struct sctp_bind_addr *bp,
300 const union sctp_addr *addr,
301 struct sctp_sock *opt)
302{
303 struct sctp_sockaddr_entry *laddr;
304 struct list_head *pos;
305
306 list_for_each(pos, &bp->address_list) {
307 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
308 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
309 return 1;
310 }
311
312 return 0;
313}
314
315/* Find the first address in the bind address list that is not present in
316 * the addrs packed array.
317 */
318union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
319 const union sctp_addr *addrs,
320 int addrcnt,
321 struct sctp_sock *opt)
322{
323 struct sctp_sockaddr_entry *laddr;
324 union sctp_addr *addr;
325 void *addr_buf;
326 struct sctp_af *af;
327 struct list_head *pos;
328 int i;
329
330 list_for_each(pos, &bp->address_list) {
331 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
332
333 addr_buf = (union sctp_addr *)addrs;
334 for (i = 0; i < addrcnt; i++) {
335 addr = (union sctp_addr *)addr_buf;
336 af = sctp_get_af_specific(addr->v4.sin_family);
337 if (!af)
338 return NULL;
339
340 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
341 break;
342
343 addr_buf += af->sockaddr_len;
344 }
345 if (i == addrcnt)
346 return &laddr->a;
347 }
348
349 return NULL;
350}
351
352/* Copy out addresses from the global local address list. */
353static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
354 union sctp_addr *addr,
Al Virodd0fc662005-10-07 07:46:04 +0100355 sctp_scope_t scope, gfp_t gfp,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -0700356 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358 int error = 0;
359
360 if (sctp_is_any(addr)) {
361 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
362 } else if (sctp_in_scope(addr, scope)) {
363 /* Now that the address is in scope, check to see if
364 * the address type is supported by local sock as
365 * well as the remote peer.
366 */
367 if ((((AF_INET == addr->sa.sa_family) &&
368 (flags & SCTP_ADDR4_PEERSUPP))) ||
369 (((AF_INET6 == addr->sa.sa_family) &&
370 (flags & SCTP_ADDR6_ALLOWED) &&
371 (flags & SCTP_ADDR6_PEERSUPP))))
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700372 error = sctp_add_bind_addr(dest, addr, 1, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
374
375 return error;
376}
377
378/* Is this a wildcard address? */
379int sctp_is_any(const union sctp_addr *addr)
380{
381 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
382 if (!af)
383 return 0;
384 return af->is_any(addr);
385}
386
387/* Is 'addr' valid for 'scope'? */
388int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
389{
390 sctp_scope_t addr_scope = sctp_scope(addr);
391
392 /* The unusable SCTP addresses will not be considered with
393 * any defined scopes.
394 */
395 if (SCTP_SCOPE_UNUSABLE == addr_scope)
396 return 0;
397 /*
398 * For INIT and INIT-ACK address list, let L be the level of
399 * of requested destination address, sender and receiver
400 * SHOULD include all of its addresses with level greater
401 * than or equal to L.
402 */
403 if (addr_scope <= scope)
404 return 1;
405
406 return 0;
407}
408
409/********************************************************************
410 * 3rd Level Abstractions
411 ********************************************************************/
412
413/* What is the scope of 'addr'? */
414sctp_scope_t sctp_scope(const union sctp_addr *addr)
415{
416 struct sctp_af *af;
417
418 af = sctp_get_af_specific(addr->sa.sa_family);
419 if (!af)
420 return SCTP_SCOPE_UNUSABLE;
421
422 return af->scope((union sctp_addr *)addr);
423}