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
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. */
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 *);
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 */
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)
67 {
68 struct sctp_sockaddr_entry *addr;
69 struct list_head *pos;
70 int error = 0;
71
72 /* All addresses share the same port. */
73 dest->port = src->port;
74
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,
79 gfp, flags);
80 if (error < 0)
81 goto out;
82 }
83
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.
87 */
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,
91 list);
92 error = sctp_copy_one_addr(dest, &addr->a,
93 SCTP_SCOPE_LINK, gfp,
94 flags);
95 if (error < 0)
96 goto out;
97 }
98 }
99
100 out:
101 if (error)
102 sctp_bind_addr_clean(dest);
103
104 return error;
105 }
106
107 /* Initialize the SCTP_bind_addr structure for either an endpoint or
108 * an association.
109 */
110 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
111 {
112 bp->malloced = 0;
113
114 INIT_LIST_HEAD(&bp->address_list);
115 bp->port = port;
116 }
117
118 /* Dispose of the address list. */
119 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
120 {
121 struct sctp_sockaddr_entry *addr;
122 struct list_head *pos, *temp;
123
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);
127 list_del(pos);
128 kfree(addr);
129 SCTP_DBG_OBJCNT_DEC(addr);
130 }
131 }
132
133 /* Dispose of an SCTP_bind_addr structure */
134 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
135 {
136 /* Empty the bind address list. */
137 sctp_bind_addr_clean(bp);
138
139 if (bp->malloced) {
140 kfree(bp);
141 SCTP_DBG_OBJCNT_DEC(bind_addr);
142 }
143 }
144
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,
147 int gfp)
148 {
149 struct sctp_sockaddr_entry *addr;
150
151 /* Add the address to the bind address list. */
152 addr = t_new(struct sctp_sockaddr_entry, gfp);
153 if (!addr)
154 return -ENOMEM;
155
156 memcpy(&addr->a, new, sizeof(*new));
157
158 /* Fix up the port if it has not yet been set.
159 * Both v4 and v6 have the port at the same offset.
160 */
161 if (!addr->a.v4.sin_port)
162 addr->a.v4.sin_port = bp->port;
163
164 INIT_LIST_HEAD(&addr->list);
165 list_add_tail(&addr->list, &bp->address_list);
166 SCTP_DBG_OBJCNT_INC(addr);
167
168 return 0;
169 }
170
171 /* Delete an address from the bind address list in the SCTP_bind_addr
172 * structure.
173 */
174 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
175 {
176 struct list_head *pos, *temp;
177 struct sctp_sockaddr_entry *addr;
178
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. */
183 list_del(pos);
184 kfree(addr);
185 SCTP_DBG_OBJCNT_DEC(addr);
186
187 return 0;
188 }
189 }
190
191 return -EINVAL;
192 }
193
194 /* Create a network byte-order representation of all the addresses
195 * formated as SCTP parameters.
196 *
197 * The second argument is the return value for the length.
198 */
199 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
200 int *addrs_len, int gfp)
201 {
202 union sctp_params addrparms;
203 union sctp_params retval;
204 int addrparms_len;
205 union sctp_addr_param rawaddr;
206 int len;
207 struct sctp_sockaddr_entry *addr;
208 struct list_head *pos;
209 struct sctp_af *af;
210
211 addrparms_len = 0;
212 len = 0;
213
214 /* Allocate enough memory at once. */
215 list_for_each(pos, &bp->address_list) {
216 len += sizeof(union sctp_addr_param);
217 }
218
219 /* Don't even bother embedding an address if there
220 * is only one.
221 */
222 if (len == sizeof(union sctp_addr_param)) {
223 retval.v = NULL;
224 goto end_raw;
225 }
226
227 retval.v = kmalloc(len, gfp);
228 if (!retval.v)
229 goto end_raw;
230
231 addrparms = retval;
232
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);
238 addrparms.v += len;
239 addrparms_len += len;
240 }
241
242 end_raw:
243 *addrs_len = addrparms_len;
244 return retval;
245 }
246
247 /*
248 * Create an address list out of the raw address list format (IPv4 and IPv6
249 * address parameters).
250 */
251 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
252 int addrs_len, __u16 port, int gfp)
253 {
254 union sctp_addr_param *rawaddr;
255 struct sctp_paramhdr *param;
256 union sctp_addr addr;
257 int retval = 0;
258 int len;
259 struct sctp_af *af;
260
261 /* Convert the raw address to standard address format */
262 while (addrs_len) {
263 param = (struct sctp_paramhdr *)raw_addr_list;
264 rawaddr = (union sctp_addr_param *)raw_addr_list;
265
266 af = sctp_get_af_specific(param_type2af(param->type));
267 if (unlikely(!af)) {
268 retval = -EINVAL;
269 sctp_bind_addr_clean(bp);
270 break;
271 }
272
273 af->from_addr_param(&addr, rawaddr, port, 0);
274 retval = sctp_add_bind_addr(bp, &addr, gfp);
275 if (retval) {
276 /* Can't finish building the list, clean up. */
277 sctp_bind_addr_clean(bp);
278 break;
279 }
280
281 len = ntohs(param->length);
282 addrs_len -= len;
283 raw_addr_list += len;
284 }
285
286 return retval;
287 }
288
289 /********************************************************************
290 * 2nd Level Abstractions
291 ********************************************************************/
292
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)
297 {
298 struct sctp_sockaddr_entry *laddr;
299 struct list_head *pos;
300
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))
304 return 1;
305 }
306
307 return 0;
308 }
309
310 /* Find the first address in the bind address list that is not present in
311 * the addrs packed array.
312 */
313 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
314 const union sctp_addr *addrs,
315 int addrcnt,
316 struct sctp_sock *opt)
317 {
318 struct sctp_sockaddr_entry *laddr;
319 union sctp_addr *addr;
320 void *addr_buf;
321 struct sctp_af *af;
322 struct list_head *pos;
323 int i;
324
325 list_for_each(pos, &bp->address_list) {
326 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
327
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);
332 if (!af)
333 return NULL;
334
335 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
336 break;
337
338 addr_buf += af->sockaddr_len;
339 }
340 if (i == addrcnt)
341 return &laddr->a;
342 }
343
344 return NULL;
345 }
346
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)
351 {
352 int error = 0;
353
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.
360 */
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);
367 }
368
369 return error;
370 }
371
372 /* Is this a wildcard address? */
373 int sctp_is_any(const union sctp_addr *addr)
374 {
375 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
376 if (!af)
377 return 0;
378 return af->is_any(addr);
379 }
380
381 /* Is 'addr' valid for 'scope'? */
382 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
383 {
384 sctp_scope_t addr_scope = sctp_scope(addr);
385
386 /* The unusable SCTP addresses will not be considered with
387 * any defined scopes.
388 */
389 if (SCTP_SCOPE_UNUSABLE == addr_scope)
390 return 0;
391 /*
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.
396 */
397 if (addr_scope <= scope)
398 return 1;
399
400 return 0;
401 }
402
403 /********************************************************************
404 * 3rd Level Abstractions
405 ********************************************************************/
406
407 /* What is the scope of 'addr'? */
408 sctp_scope_t sctp_scope(const union sctp_addr *addr)
409 {
410 struct sctp_af *af;
411
412 af = sctp_get_af_specific(addr->sa.sa_family);
413 if (!af)
414 return SCTP_SCOPE_UNUSABLE;
415
416 return af->scope((union sctp_addr *)addr);
417 }
418
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