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1da177e4 LT |
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> | |
1da177e4 LT |
46 | #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. */ | |
54 | static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *, | |
dd0fc66f | 55 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 56 | int flags); |
1da177e4 LT |
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 | */ | |
d808ad9a | 64 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, |
1da177e4 | 65 | const struct sctp_bind_addr *src, |
dd0fc66f | 66 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 67 | int flags) |
1da177e4 LT |
68 | { |
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); | |
02a8a4db | 79 | error = sctp_copy_one_addr(dest, &addr->a, scope, |
1da177e4 LT |
80 | 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); | |
02a8a4db | 93 | error = sctp_copy_one_addr(dest, &addr->a, |
1da177e4 LT |
94 | SCTP_SCOPE_LINK, gfp, |
95 | flags); | |
96 | if (error < 0) | |
97 | goto out; | |
98 | } | |
99 | } | |
100 | ||
101 | out: | |
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 | */ | |
111 | void 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. */ | |
120 | static 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 */ | |
135 | void 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. */ | |
147 | int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, | |
dc022a98 | 148 | __u8 use_as_src, gfp_t gfp) |
1da177e4 LT |
149 | { |
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 | ||
5ab7b859 | 157 | memcpy(&addr->a, new, sizeof(*new)); |
1da177e4 LT |
158 | |
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 | */ | |
5ab7b859 AV |
162 | if (!addr->a.v4.sin_port) |
163 | addr->a.v4.sin_port = htons(bp->port); | |
1da177e4 | 164 | |
dc022a98 | 165 | addr->use_as_src = use_as_src; |
29303547 | 166 | addr->valid = 1; |
dc022a98 | 167 | |
1da177e4 | 168 | INIT_LIST_HEAD(&addr->list); |
29303547 | 169 | INIT_RCU_HEAD(&addr->rcu); |
559cf710 VY |
170 | |
171 | /* We always hold a socket lock when calling this function, | |
172 | * and that acts as a writer synchronizing lock. | |
173 | */ | |
174 | list_add_tail_rcu(&addr->list, &bp->address_list); | |
1da177e4 LT |
175 | SCTP_DBG_OBJCNT_INC(addr); |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* Delete an address from the bind address list in the SCTP_bind_addr | |
181 | * structure. | |
182 | */ | |
559cf710 | 183 | int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr, |
78bd8fbb | 184 | void fastcall (*rcu_call)(struct rcu_head *head, |
559cf710 | 185 | void (*func)(struct rcu_head *head))) |
1da177e4 | 186 | { |
559cf710 | 187 | struct sctp_sockaddr_entry *addr, *temp; |
1da177e4 | 188 | |
559cf710 VY |
189 | /* We hold the socket lock when calling this function, |
190 | * and that acts as a writer synchronizing lock. | |
191 | */ | |
192 | list_for_each_entry_safe(addr, temp, &bp->address_list, list) { | |
c9a08505 | 193 | if (sctp_cmp_addr_exact(&addr->a, del_addr)) { |
1da177e4 | 194 | /* Found the exact match. */ |
559cf710 VY |
195 | addr->valid = 0; |
196 | list_del_rcu(&addr->list); | |
197 | break; | |
1da177e4 LT |
198 | } |
199 | } | |
200 | ||
559cf710 VY |
201 | /* Call the rcu callback provided in the args. This function is |
202 | * called by both BH packet processing and user side socket option | |
203 | * processing, but it works on different lists in those 2 contexts. | |
204 | * Each context provides it's own callback, whether call_rcu_bh() | |
205 | * or call_rcu(), to make sure that we wait for an appropriate time. | |
206 | */ | |
207 | if (addr && !addr->valid) { | |
208 | rcu_call(&addr->rcu, sctp_local_addr_free); | |
209 | SCTP_DBG_OBJCNT_DEC(addr); | |
210 | } | |
211 | ||
1da177e4 LT |
212 | return -EINVAL; |
213 | } | |
214 | ||
215 | /* Create a network byte-order representation of all the addresses | |
216 | * formated as SCTP parameters. | |
217 | * | |
218 | * The second argument is the return value for the length. | |
219 | */ | |
220 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 221 | int *addrs_len, |
dd0fc66f | 222 | gfp_t gfp) |
1da177e4 LT |
223 | { |
224 | union sctp_params addrparms; | |
225 | union sctp_params retval; | |
226 | int addrparms_len; | |
227 | union sctp_addr_param rawaddr; | |
228 | int len; | |
229 | struct sctp_sockaddr_entry *addr; | |
230 | struct list_head *pos; | |
231 | struct sctp_af *af; | |
232 | ||
233 | addrparms_len = 0; | |
234 | len = 0; | |
235 | ||
236 | /* Allocate enough memory at once. */ | |
237 | list_for_each(pos, &bp->address_list) { | |
238 | len += sizeof(union sctp_addr_param); | |
239 | } | |
240 | ||
241 | /* Don't even bother embedding an address if there | |
242 | * is only one. | |
243 | */ | |
244 | if (len == sizeof(union sctp_addr_param)) { | |
245 | retval.v = NULL; | |
246 | goto end_raw; | |
247 | } | |
248 | ||
249 | retval.v = kmalloc(len, gfp); | |
250 | if (!retval.v) | |
251 | goto end_raw; | |
252 | ||
253 | addrparms = retval; | |
254 | ||
255 | list_for_each(pos, &bp->address_list) { | |
256 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
6244be4e AV |
257 | af = sctp_get_af_specific(addr->a.v4.sin_family); |
258 | len = af->to_addr_param(&addr->a, &rawaddr); | |
1da177e4 LT |
259 | memcpy(addrparms.v, &rawaddr, len); |
260 | addrparms.v += len; | |
261 | addrparms_len += len; | |
262 | } | |
263 | ||
264 | end_raw: | |
265 | *addrs_len = addrparms_len; | |
266 | return retval; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Create an address list out of the raw address list format (IPv4 and IPv6 | |
271 | * address parameters). | |
272 | */ | |
273 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, | |
dd0fc66f | 274 | int addrs_len, __u16 port, gfp_t gfp) |
1da177e4 LT |
275 | { |
276 | union sctp_addr_param *rawaddr; | |
277 | struct sctp_paramhdr *param; | |
278 | union sctp_addr addr; | |
279 | int retval = 0; | |
280 | int len; | |
281 | struct sctp_af *af; | |
282 | ||
283 | /* Convert the raw address to standard address format */ | |
284 | while (addrs_len) { | |
285 | param = (struct sctp_paramhdr *)raw_addr_list; | |
286 | rawaddr = (union sctp_addr_param *)raw_addr_list; | |
287 | ||
288 | af = sctp_get_af_specific(param_type2af(param->type)); | |
289 | if (unlikely(!af)) { | |
290 | retval = -EINVAL; | |
291 | sctp_bind_addr_clean(bp); | |
292 | break; | |
293 | } | |
294 | ||
dd86d136 AV |
295 | af->from_addr_param(&addr, rawaddr, htons(port), 0); |
296 | retval = sctp_add_bind_addr(bp, &addr, 1, gfp); | |
1da177e4 LT |
297 | if (retval) { |
298 | /* Can't finish building the list, clean up. */ | |
299 | sctp_bind_addr_clean(bp); | |
300 | break; | |
301 | } | |
302 | ||
303 | len = ntohs(param->length); | |
304 | addrs_len -= len; | |
305 | raw_addr_list += len; | |
306 | } | |
307 | ||
308 | return retval; | |
309 | } | |
310 | ||
311 | /******************************************************************** | |
312 | * 2nd Level Abstractions | |
313 | ********************************************************************/ | |
314 | ||
315 | /* Does this contain a specified address? Allow wildcarding. */ | |
d808ad9a | 316 | int sctp_bind_addr_match(struct sctp_bind_addr *bp, |
1da177e4 LT |
317 | const union sctp_addr *addr, |
318 | struct sctp_sock *opt) | |
319 | { | |
320 | struct sctp_sockaddr_entry *laddr; | |
559cf710 VY |
321 | int match = 0; |
322 | ||
323 | rcu_read_lock(); | |
324 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
325 | if (!laddr->valid) | |
326 | continue; | |
327 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { | |
328 | match = 1; | |
329 | break; | |
330 | } | |
1da177e4 | 331 | } |
559cf710 | 332 | rcu_read_unlock(); |
1da177e4 | 333 | |
559cf710 | 334 | return match; |
1da177e4 LT |
335 | } |
336 | ||
337 | /* Find the first address in the bind address list that is not present in | |
338 | * the addrs packed array. | |
339 | */ | |
340 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
341 | const union sctp_addr *addrs, | |
342 | int addrcnt, | |
343 | struct sctp_sock *opt) | |
344 | { | |
345 | struct sctp_sockaddr_entry *laddr; | |
346 | union sctp_addr *addr; | |
347 | void *addr_buf; | |
348 | struct sctp_af *af; | |
1da177e4 LT |
349 | int i; |
350 | ||
559cf710 VY |
351 | /* This is only called sctp_send_asconf_del_ip() and we hold |
352 | * the socket lock in that code patch, so that address list | |
353 | * can't change. | |
354 | */ | |
355 | list_for_each_entry(laddr, &bp->address_list, list) { | |
1da177e4 LT |
356 | addr_buf = (union sctp_addr *)addrs; |
357 | for (i = 0; i < addrcnt; i++) { | |
358 | addr = (union sctp_addr *)addr_buf; | |
359 | af = sctp_get_af_specific(addr->v4.sin_family); | |
d808ad9a | 360 | if (!af) |
559cf710 | 361 | break; |
1da177e4 | 362 | |
5f242a13 | 363 | if (opt->pf->cmp_addr(&laddr->a, addr, opt)) |
1da177e4 LT |
364 | break; |
365 | ||
366 | addr_buf += af->sockaddr_len; | |
367 | } | |
368 | if (i == addrcnt) | |
5ae955cf | 369 | return &laddr->a; |
1da177e4 LT |
370 | } |
371 | ||
372 | return NULL; | |
373 | } | |
374 | ||
375 | /* Copy out addresses from the global local address list. */ | |
d808ad9a | 376 | static int sctp_copy_one_addr(struct sctp_bind_addr *dest, |
1da177e4 | 377 | union sctp_addr *addr, |
dd0fc66f | 378 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 379 | int flags) |
1da177e4 LT |
380 | { |
381 | int error = 0; | |
382 | ||
383 | if (sctp_is_any(addr)) { | |
384 | error = sctp_copy_local_addr_list(dest, scope, gfp, flags); | |
385 | } else if (sctp_in_scope(addr, scope)) { | |
386 | /* Now that the address is in scope, check to see if | |
387 | * the address type is supported by local sock as | |
388 | * well as the remote peer. | |
389 | */ | |
390 | if ((((AF_INET == addr->sa.sa_family) && | |
391 | (flags & SCTP_ADDR4_PEERSUPP))) || | |
392 | (((AF_INET6 == addr->sa.sa_family) && | |
393 | (flags & SCTP_ADDR6_ALLOWED) && | |
394 | (flags & SCTP_ADDR6_PEERSUPP)))) | |
02a8a4db | 395 | error = sctp_add_bind_addr(dest, addr, 1, gfp); |
1da177e4 LT |
396 | } |
397 | ||
398 | return error; | |
399 | } | |
400 | ||
401 | /* Is this a wildcard address? */ | |
402 | int sctp_is_any(const union sctp_addr *addr) | |
403 | { | |
404 | struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family); | |
405 | if (!af) | |
406 | return 0; | |
407 | return af->is_any(addr); | |
408 | } | |
409 | ||
410 | /* Is 'addr' valid for 'scope'? */ | |
411 | int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) | |
412 | { | |
413 | sctp_scope_t addr_scope = sctp_scope(addr); | |
414 | ||
415 | /* The unusable SCTP addresses will not be considered with | |
416 | * any defined scopes. | |
417 | */ | |
418 | if (SCTP_SCOPE_UNUSABLE == addr_scope) | |
419 | return 0; | |
420 | /* | |
421 | * For INIT and INIT-ACK address list, let L be the level of | |
422 | * of requested destination address, sender and receiver | |
423 | * SHOULD include all of its addresses with level greater | |
424 | * than or equal to L. | |
425 | */ | |
426 | if (addr_scope <= scope) | |
427 | return 1; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | /******************************************************************** | |
433 | * 3rd Level Abstractions | |
434 | ********************************************************************/ | |
435 | ||
436 | /* What is the scope of 'addr'? */ | |
437 | sctp_scope_t sctp_scope(const union sctp_addr *addr) | |
438 | { | |
439 | struct sctp_af *af; | |
440 | ||
441 | af = sctp_get_af_specific(addr->sa.sa_family); | |
442 | if (!af) | |
443 | return SCTP_SCOPE_UNUSABLE; | |
444 | ||
445 | return af->scope((union sctp_addr *)addr); | |
446 | } |