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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 | } |