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60c778b2 1/* SCTP kernel implementation
1da177e4
LT		 2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
6 *
60c778b2 7 * This file is part of the SCTP kernel implementation
1da177e4
LT		 8 *
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
12 *
60c778b2 13 * This SCTP implementation is free software;
1da177e4
LT		 14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
60c778b2 19 * This SCTP implementation is distributed in the hope that it
1da177e4
LT		 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * C. Robin <chris@hundredacre.ac.uk>
41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Xingang Guo <xingang.guo@intel.com>
43 * Dajiang Zhang <dajiang.zhang@nokia.com>
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Ardelle Fan <ardelle.fan@intel.com>
47 * Kevin Gao <kevin.gao@intel.com>
48 *
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
51 */
52
145ce502
JP		 53#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
1da177e4
LT		 55#include <linux/types.h>
56#include <linux/kernel.h>
57#include <linux/ip.h>
58#include <linux/ipv6.h>
59#include <linux/net.h>
60#include <linux/inet.h>
ebc3bbcf 61#include <linux/scatterlist.h>
1da177e4 62#include <linux/crypto.h>
5a0e3ad6 63#include <linux/slab.h>
1da177e4
LT		 64#include <net/sock.h>
65
66#include <linux/skbuff.h>
67#include <linux/random.h> /* for get_random_bytes */
68#include <net/sctp/sctp.h>
69#include <net/sctp/sm.h>
70
1da177e4
LT		 71SCTP_STATIC
72struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
73 __u8 type, __u8 flags, int paylen);
74static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
75 const struct sctp_association *asoc,
76 const struct sctp_chunk *init_chunk,
77 int *cookie_len,
78 const __u8 *raw_addrs, int addrs_len);
79static int sctp_process_param(struct sctp_association *asoc,
80 union sctp_params param,
81 const union sctp_addr *peer_addr,
dd0fc66f 82 gfp_t gfp);
8ee4be37
VY		 83static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
84 const void *data);
1da177e4
LT		 85
86/* What was the inbound interface for this chunk? */
87int sctp_chunk_iif(const struct sctp_chunk *chunk)
88{
89 struct sctp_af *af;
90 int iif = 0;
91
eddc9ec5 92 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
1da177e4
LT		 93 if (af)
94 iif = af->skb_iif(chunk->skb);
95
96 return iif;
97}
98
99/* RFC 2960 3.3.2 Initiation (INIT) (1)
100 *
101 * Note 2: The ECN capable field is reserved for future use of
102 * Explicit Congestion Notification.
103 */
104static const struct sctp_paramhdr ecap_param = {
105 SCTP_PARAM_ECN_CAPABLE,
09640e63 106 cpu_to_be16(sizeof(struct sctp_paramhdr)),
1da177e4
LT		 107};
108static const struct sctp_paramhdr prsctp_param = {
109 SCTP_PARAM_FWD_TSN_SUPPORT,
09640e63 110 cpu_to_be16(sizeof(struct sctp_paramhdr)),
1da177e4
LT		 111};
112
5fa782c2 113/* A helper to initialize an op error inside a
1da177e4
LT		 114 * provided chunk, as most cause codes will be embedded inside an
115 * abort chunk.
116 */
5bf2db03 117void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
00f1c2df 118 size_t paylen)
1da177e4
LT		 119{
120 sctp_errhdr_t err;
1da177e4
LT		 121 __u16 len;
122
d808ad9a 123 /* Cause code constants are now defined in network order. */
1da177e4
LT		 124 err.cause = cause_code;
125 len = sizeof(sctp_errhdr_t) + paylen;
1da177e4 126 err.length = htons(len);
4a1c0107 127 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
1da177e4
LT		 128}
129
5fa782c2
NH		 130/* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
132 * abort chunk. Differs from sctp_init_cause in that it won't oops
133 * if there isn't enough space in the op error chunk
134 */
135int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
136 size_t paylen)
137{
138 sctp_errhdr_t err;
139 __u16 len;
140
141 /* Cause code constants are now defined in network order. */
142 err.cause = cause_code;
143 len = sizeof(sctp_errhdr_t) + paylen;
144 err.length = htons(len);
145
2e3219b5 146 if (skb_tailroom(chunk->skb) < len)
5fa782c2
NH		 147 return -ENOSPC;
148 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
149 sizeof(sctp_errhdr_t),
150 &err);
151 return 0;
152}
1da177e4
LT		 153/* 3.3.2 Initiation (INIT) (1)
154 *
155 * This chunk is used to initiate a SCTP association between two
156 * endpoints. The format of the INIT chunk is shown below:
157 *
158 * 0 1 2 3
159 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | Type = 1 | Chunk Flags | Chunk Length |
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
163 * | Initiate Tag |
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 * | Advertised Receiver Window Credit (a_rwnd) |
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Number of Outbound Streams | Number of Inbound Streams |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 * | Initial TSN |
170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
171 * \ \
172 * / Optional/Variable-Length Parameters /
173 * \ \
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
175 *
176 *
177 * The INIT chunk contains the following parameters. Unless otherwise
178 * noted, each parameter MUST only be included once in the INIT chunk.
179 *
180 * Fixed Parameters Status
181 * ----------------------------------------------
182 * Initiate Tag Mandatory
183 * Advertised Receiver Window Credit Mandatory
184 * Number of Outbound Streams Mandatory
185 * Number of Inbound Streams Mandatory
186 * Initial TSN Mandatory
187 *
188 * Variable Parameters Status Type Value
189 * -------------------------------------------------------------
190 * IPv4 Address (Note 1) Optional 5
191 * IPv6 Address (Note 1) Optional 6
192 * Cookie Preservative Optional 9
193 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
194 * Host Name Address (Note 3) Optional 11
195 * Supported Address Types (Note 4) Optional 12
196 */
197struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
198 const struct sctp_bind_addr *bp,
dd0fc66f 199 gfp_t gfp, int vparam_len)
1da177e4
LT		 200{
201 sctp_inithdr_t init;
202 union sctp_params addrs;
203 size_t chunksize;
204 struct sctp_chunk *retval = NULL;
205 int num_types, addrs_len = 0;
206 struct sctp_sock *sp;
207 sctp_supported_addrs_param_t sat;
3dbe8656 208 __be16 types[2];
0f3fffd8 209 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 210 sctp_supported_ext_param_t ext_param;
211 int num_ext = 0;
212 __u8 extensions[3];
730fc3d0
VY		 213 sctp_paramhdr_t *auth_chunks = NULL,
214 *auth_hmacs = NULL;
1da177e4
LT		 215
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
217 *
218 * Note 1: The INIT chunks can contain multiple addresses that
219 * can be IPv4 and/or IPv6 in any combination.
220 */
221 retval = NULL;
222
223 /* Convert the provided bind address list to raw format. */
224 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
225
226 init.init_tag = htonl(asoc->c.my_vtag);
227 init.a_rwnd = htonl(asoc->rwnd);
228 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
229 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
230 init.initial_tsn = htonl(asoc->c.initial_tsn);
231
232 /* How many address types are needed? */
233 sp = sctp_sk(asoc->base.sk);
234 num_types = sp->pf->supported_addrs(sp, types);
235
a8170c35
WY		 236 chunksize = sizeof(init) + addrs_len;
237 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
1da177e4 238 chunksize += sizeof(ecap_param);
8ee4be37 239
036b579b
VY		 240 if (sctp_prsctp_enable)
241 chunksize += sizeof(prsctp_param);
242
131a47e3
VY		 243 /* ADDIP: Section 4.2.7:
244 * An implementation supporting this extension [ADDIP] MUST list
245 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
246 * INIT-ACK parameters.
131a47e3
VY		 247 */
248 if (sctp_addip_enable) {
249 extensions[num_ext] = SCTP_CID_ASCONF;
250 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
251 num_ext += 2;
252 }
253
6fc791ee 254 if (sp->adaptation_ind)
255 chunksize += sizeof(aiparam);
256
1da177e4
LT		 257 chunksize += vparam_len;
258
730fc3d0
VY		 259 /* Account for AUTH related parameters */
260 if (sctp_auth_enable) {
261 /* Add random parameter length*/
262 chunksize += sizeof(asoc->c.auth_random);
263
264 /* Add HMACS parameter length if any were defined */
265 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
266 if (auth_hmacs->length)
a8170c35 267 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 268 else
269 auth_hmacs = NULL;
270
271 /* Add CHUNKS parameter length */
272 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
273 if (auth_chunks->length)
a8170c35 274 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0 275 else
9baffaa6 276 auth_chunks = NULL;
730fc3d0
VY		 277
278 extensions[num_ext] = SCTP_CID_AUTH;
279 num_ext += 1;
280 }
281
131a47e3
VY		 282 /* If we have any extensions to report, account for that */
283 if (num_ext)
a8170c35
WY		 284 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
285 num_ext);
131a47e3 286
1da177e4
LT		 287 /* RFC 2960 3.3.2 Initiation (INIT) (1)
288 *
289 * Note 3: An INIT chunk MUST NOT contain more than one Host
290 * Name address parameter. Moreover, the sender of the INIT
291 * MUST NOT combine any other address types with the Host Name
292 * address in the INIT. The receiver of INIT MUST ignore any
293 * other address types if the Host Name address parameter is
294 * present in the received INIT chunk.
295 *
296 * PLEASE DO NOT FIXME [This version does not support Host Name.]
297 */
298
299 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
300 if (!retval)
301 goto nodata;
302
303 retval->subh.init_hdr =
304 sctp_addto_chunk(retval, sizeof(init), &init);
305 retval->param_hdr.v =
306 sctp_addto_chunk(retval, addrs_len, addrs.v);
307
308 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 *
310 * Note 4: This parameter, when present, specifies all the
311 * address types the sending endpoint can support. The absence
312 * of this parameter indicates that the sending endpoint can
313 * support any address type.
314 */
315 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
316 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
317 sctp_addto_chunk(retval, sizeof(sat), &sat);
318 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
319
320 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3 321
7aa1b54b 322 /* Add the supported extensions parameter. Be nice and add this
131a47e3
VY		 323 * fist before addiding the parameters for the extensions themselves
324 */
325 if (num_ext) {
326 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
327 ext_param.param_hdr.length =
328 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
329 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
330 &ext_param);
8ee4be37 331 sctp_addto_param(retval, num_ext, extensions);
131a47e3
VY		 332 }
333
1da177e4
LT		 334 if (sctp_prsctp_enable)
335 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
131a47e3 336
6fc791ee 337 if (sp->adaptation_ind) {
338 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
339 aiparam.param_hdr.length = htons(sizeof(aiparam));
340 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
341 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
342 }
131a47e3 343
730fc3d0
VY		 344 /* Add SCTP-AUTH chunks to the parameter list */
345 if (sctp_auth_enable) {
346 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
347 asoc->c.auth_random);
348 if (auth_hmacs)
349 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
350 auth_hmacs);
351 if (auth_chunks)
352 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
353 auth_chunks);
354 }
1da177e4 355nodata:
a51482bd 356 kfree(addrs.v);
1da177e4
LT		 357 return retval;
358}
359
360struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
361 const struct sctp_chunk *chunk,
dd0fc66f 362 gfp_t gfp, int unkparam_len)
1da177e4
LT		 363{
364 sctp_inithdr_t initack;
365 struct sctp_chunk *retval;
366 union sctp_params addrs;
6fc791ee 367 struct sctp_sock *sp;
1da177e4
LT		 368 int addrs_len;
369 sctp_cookie_param_t *cookie;
370 int cookie_len;
371 size_t chunksize;
0f3fffd8 372 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 373 sctp_supported_ext_param_t ext_param;
374 int num_ext = 0;
375 __u8 extensions[3];
730fc3d0
VY		 376 sctp_paramhdr_t *auth_chunks = NULL,
377 *auth_hmacs = NULL,
378 *auth_random = NULL;
1da177e4
LT		 379
380 retval = NULL;
381
382 /* Note: there may be no addresses to embed. */
383 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
384
385 initack.init_tag = htonl(asoc->c.my_vtag);
386 initack.a_rwnd = htonl(asoc->rwnd);
387 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
388 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
389 initack.initial_tsn = htonl(asoc->c.initial_tsn);
390
391 /* FIXME: We really ought to build the cookie right
392 * into the packet instead of allocating more fresh memory.
393 */
394 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
395 addrs.v, addrs_len);
396 if (!cookie)
397 goto nomem_cookie;
398
399 /* Calculate the total size of allocation, include the reserved
400 * space for reporting unknown parameters if it is specified.
401 */
6fc791ee 402 sp = sctp_sk(asoc->base.sk);
1da177e4
LT		 403 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
404
d808ad9a 405 /* Tell peer that we'll do ECN only if peer advertised such cap. */
1da177e4
LT		 406 if (asoc->peer.ecn_capable)
407 chunksize += sizeof(ecap_param);
408
5ffad5ac 409 if (asoc->peer.prsctp_capable)
036b579b
VY		 410 chunksize += sizeof(prsctp_param);
411
5ffad5ac 412 if (asoc->peer.asconf_capable) {
131a47e3
VY		 413 extensions[num_ext] = SCTP_CID_ASCONF;
414 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
415 num_ext += 2;
416 }
417
6fc791ee 418 if (sp->adaptation_ind)
419 chunksize += sizeof(aiparam);
1da177e4 420
730fc3d0
VY		 421 if (asoc->peer.auth_capable) {
422 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
423 chunksize += ntohs(auth_random->length);
424
425 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
426 if (auth_hmacs->length)
a8170c35 427 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 428 else
429 auth_hmacs = NULL;
430
431 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
432 if (auth_chunks->length)
a8170c35 433 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0
VY		 434 else
435 auth_chunks = NULL;
436
437 extensions[num_ext] = SCTP_CID_AUTH;
438 num_ext += 1;
439 }
440
8ee4be37 441 if (num_ext)
a8170c35
WY		 442 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
443 num_ext);
8ee4be37 444
1da177e4
LT		 445 /* Now allocate and fill out the chunk. */
446 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
447 if (!retval)
448 goto nomem_chunk;
449
b99a4d53
DC		 450 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
451 *
452 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
453 * HEARTBEAT ACK, * etc.) to the same destination transport
454 * address from which it received the DATA or control chunk
455 * to which it is replying.
456 *
457 * [INIT ACK back to where the INIT came from.]
1da177e4
LT		 458 */
459 retval->transport = chunk->transport;
b99a4d53 460
1da177e4
LT		 461 retval->subh.init_hdr =
462 sctp_addto_chunk(retval, sizeof(initack), &initack);
463 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
464 sctp_addto_chunk(retval, cookie_len, cookie);
465 if (asoc->peer.ecn_capable)
466 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3
VY		 467 if (num_ext) {
468 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
469 ext_param.param_hdr.length =
470 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
471 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
472 &ext_param);
8ee4be37 473 sctp_addto_param(retval, num_ext, extensions);
131a47e3 474 }
1da177e4
LT		 475 if (asoc->peer.prsctp_capable)
476 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
477
6fc791ee 478 if (sp->adaptation_ind) {
479 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
480 aiparam.param_hdr.length = htons(sizeof(aiparam));
481 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
482 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
483 }
1da177e4 484
730fc3d0
VY		 485 if (asoc->peer.auth_capable) {
486 sctp_addto_chunk(retval, ntohs(auth_random->length),
487 auth_random);
488 if (auth_hmacs)
489 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
490 auth_hmacs);
491 if (auth_chunks)
492 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
493 auth_chunks);
494 }
495
1da177e4
LT		 496 /* We need to remove the const qualifier at this point. */
497 retval->asoc = (struct sctp_association *) asoc;
498
1da177e4
LT		 499nomem_chunk:
500 kfree(cookie);
501nomem_cookie:
a51482bd 502 kfree(addrs.v);
1da177e4
LT		 503 return retval;
504}
505
506/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
507 *
508 * This chunk is used only during the initialization of an association.
509 * It is sent by the initiator of an association to its peer to complete
510 * the initialization process. This chunk MUST precede any DATA chunk
511 * sent within the association, but MAY be bundled with one or more DATA
512 * chunks in the same packet.
513 *
514 * 0 1 2 3
515 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * | Type = 10 |Chunk Flags | Length |
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
519 * / Cookie /
520 * \ \
521 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
522 *
523 * Chunk Flags: 8 bit
524 *
525 * Set to zero on transmit and ignored on receipt.
526 *
527 * Length: 16 bits (unsigned integer)
528 *
529 * Set to the size of the chunk in bytes, including the 4 bytes of
530 * the chunk header and the size of the Cookie.
531 *
532 * Cookie: variable size
533 *
534 * This field must contain the exact cookie received in the
535 * State Cookie parameter from the previous INIT ACK.
536 *
537 * An implementation SHOULD make the cookie as small as possible
538 * to insure interoperability.
539 */
540struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
541 const struct sctp_chunk *chunk)
542{
543 struct sctp_chunk *retval;
544 void *cookie;
545 int cookie_len;
546
547 cookie = asoc->peer.cookie;
548 cookie_len = asoc->peer.cookie_len;
549
550 /* Build a cookie echo chunk. */
551 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
552 if (!retval)
553 goto nodata;
554 retval->subh.cookie_hdr =
555 sctp_addto_chunk(retval, cookie_len, cookie);
556
557 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
558 *
559 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
560 * HEARTBEAT ACK, * etc.) to the same destination transport
561 * address from which it * received the DATA or control chunk
562 * to which it is replying.
563 *
564 * [COOKIE ECHO back to where the INIT ACK came from.]
565 */
566 if (chunk)
567 retval->transport = chunk->transport;
568
569nodata:
570 return retval;
571}
572
573/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
574 *
575 * This chunk is used only during the initialization of an
576 * association. It is used to acknowledge the receipt of a COOKIE
577 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
578 * within the association, but MAY be bundled with one or more DATA
579 * chunks or SACK chunk in the same SCTP packet.
580 *
581 * 0 1 2 3
582 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
584 * | Type = 11 |Chunk Flags | Length = 4 |
585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
586 *
587 * Chunk Flags: 8 bits
588 *
589 * Set to zero on transmit and ignored on receipt.
590 */
591struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
592 const struct sctp_chunk *chunk)
593{
594 struct sctp_chunk *retval;
595
596 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
597
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
599 *
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
604 *
605 * [COOKIE ACK back to where the COOKIE ECHO came from.]
606 */
607 if (retval && chunk)
608 retval->transport = chunk->transport;
609
610 return retval;
611}
612
613/*
614 * Appendix A: Explicit Congestion Notification:
615 * CWR:
616 *
617 * RFC 2481 details a specific bit for a sender to send in the header of
618 * its next outbound TCP segment to indicate to its peer that it has
619 * reduced its congestion window. This is termed the CWR bit. For
620 * SCTP the same indication is made by including the CWR chunk.
621 * This chunk contains one data element, i.e. the TSN number that
622 * was sent in the ECNE chunk. This element represents the lowest
623 * TSN number in the datagram that was originally marked with the
624 * CE bit.
625 *
626 * 0 1 2 3
627 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
629 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 * | Lowest TSN Number |
632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
633 *
634 * Note: The CWR is considered a Control chunk.
635 */
636struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
637 const __u32 lowest_tsn,
638 const struct sctp_chunk *chunk)
639{
640 struct sctp_chunk *retval;
641 sctp_cwrhdr_t cwr;
642
643 cwr.lowest_tsn = htonl(lowest_tsn);
644 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
645 sizeof(sctp_cwrhdr_t));
646
647 if (!retval)
648 goto nodata;
649
650 retval->subh.ecn_cwr_hdr =
651 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
652
653 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
654 *
655 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
656 * HEARTBEAT ACK, * etc.) to the same destination transport
657 * address from which it * received the DATA or control chunk
658 * to which it is replying.
659 *
660 * [Report a reduced congestion window back to where the ECNE
661 * came from.]
662 */
663 if (chunk)
664 retval->transport = chunk->transport;
665
666nodata:
667 return retval;
668}
669
670/* Make an ECNE chunk. This is a congestion experienced report. */
671struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
672 const __u32 lowest_tsn)
673{
674 struct sctp_chunk *retval;
675 sctp_ecnehdr_t ecne;
676
677 ecne.lowest_tsn = htonl(lowest_tsn);
678 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
679 sizeof(sctp_ecnehdr_t));
680 if (!retval)
681 goto nodata;
682 retval->subh.ecne_hdr =
683 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
684
685nodata:
686 return retval;
687}
688
689/* Make a DATA chunk for the given association from the provided
690 * parameters. However, do not populate the data payload.
691 */
692struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
693 const struct sctp_sndrcvinfo *sinfo,
694 int data_len, __u8 flags, __u16 ssn)
695{
696 struct sctp_chunk *retval;
697 struct sctp_datahdr dp;
698 int chunk_len;
699
700 /* We assign the TSN as LATE as possible, not here when
701 * creating the chunk.
702 */
703 dp.tsn = 0;
704 dp.stream = htons(sinfo->sinfo_stream);
705 dp.ppid = sinfo->sinfo_ppid;
706
707 /* Set the flags for an unordered send. */
eaa5c54d 708 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
1da177e4
LT		 709 flags |= SCTP_DATA_UNORDERED;
710 dp.ssn = 0;
711 } else
712 dp.ssn = htons(ssn);
713
714 chunk_len = sizeof(dp) + data_len;
715 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
716 if (!retval)
717 goto nodata;
718
719 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
720 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
721
722nodata:
723 return retval;
724}
725
726/* Create a selective ackowledgement (SACK) for the given
727 * association. This reports on which TSN's we've seen to date,
728 * including duplicates and gaps.
729 */
730struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
731{
732 struct sctp_chunk *retval;
733 struct sctp_sackhdr sack;
734 int len;
735 __u32 ctsn;
736 __u16 num_gabs, num_dup_tsns;
737 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
02015180 738 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
1da177e4 739
02015180 740 memset(gabs, 0, sizeof(gabs));
1da177e4
LT		 741 ctsn = sctp_tsnmap_get_ctsn(map);
742 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
743
744 /* How much room is needed in the chunk? */
02015180 745 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
1da177e4
LT		 746 num_dup_tsns = sctp_tsnmap_num_dups(map);
747
748 /* Initialize the SACK header. */
749 sack.cum_tsn_ack = htonl(ctsn);
750 sack.a_rwnd = htonl(asoc->a_rwnd);
751 sack.num_gap_ack_blocks = htons(num_gabs);
752 sack.num_dup_tsns = htons(num_dup_tsns);
753
754 len = sizeof(sack)
755 + sizeof(struct sctp_gap_ack_block) * num_gabs
756 + sizeof(__u32) * num_dup_tsns;
757
758 /* Create the chunk. */
759 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
760 if (!retval)
761 goto nodata;
762
763 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
764 *
765 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
766 * HEARTBEAT ACK, etc.) to the same destination transport
767 * address from which it received the DATA or control chunk to
768 * which it is replying. This rule should also be followed if
769 * the endpoint is bundling DATA chunks together with the
770 * reply chunk.
771 *
772 * However, when acknowledging multiple DATA chunks received
773 * in packets from different source addresses in a single
774 * SACK, the SACK chunk may be transmitted to one of the
775 * destination transport addresses from which the DATA or
776 * control chunks being acknowledged were received.
777 *
778 * [BUG: We do not implement the following paragraph.
779 * Perhaps we should remember the last transport we used for a
780 * SACK and avoid that (if possible) if we have seen any
781 * duplicates. --piggy]
782 *
783 * When a receiver of a duplicate DATA chunk sends a SACK to a
784 * multi- homed endpoint it MAY be beneficial to vary the
785 * destination address and not use the source address of the
786 * DATA chunk. The reason being that receiving a duplicate
787 * from a multi-homed endpoint might indicate that the return
788 * path (as specified in the source address of the DATA chunk)
789 * for the SACK is broken.
790 *
791 * [Send to the address from which we last received a DATA chunk.]
792 */
793 retval->transport = asoc->peer.last_data_from;
794
795 retval->subh.sack_hdr =
796 sctp_addto_chunk(retval, sizeof(sack), &sack);
797
798 /* Add the gap ack block information. */
799 if (num_gabs)
800 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
02015180 801 gabs);
1da177e4
LT		 802
803 /* Add the duplicate TSN information. */
804 if (num_dup_tsns)
805 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
806 sctp_tsnmap_get_dups(map));
807
808nodata:
809 return retval;
810}
811
812/* Make a SHUTDOWN chunk. */
813struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
814 const struct sctp_chunk *chunk)
815{
816 struct sctp_chunk *retval;
817 sctp_shutdownhdr_t shut;
818 __u32 ctsn;
819
820 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
821 shut.cum_tsn_ack = htonl(ctsn);
822
823 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
824 sizeof(sctp_shutdownhdr_t));
825 if (!retval)
826 goto nodata;
827
828 retval->subh.shutdown_hdr =
829 sctp_addto_chunk(retval, sizeof(shut), &shut);
830
831 if (chunk)
832 retval->transport = chunk->transport;
833nodata:
834 return retval;
835}
836
837struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
838 const struct sctp_chunk *chunk)
839{
840 struct sctp_chunk *retval;
841
842 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
843
844 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
845 *
846 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
847 * HEARTBEAT ACK, * etc.) to the same destination transport
848 * address from which it * received the DATA or control chunk
849 * to which it is replying.
850 *
851 * [ACK back to where the SHUTDOWN came from.]
852 */
853 if (retval && chunk)
854 retval->transport = chunk->transport;
855
856 return retval;
857}
858
859struct sctp_chunk *sctp_make_shutdown_complete(
860 const struct sctp_association *asoc,
861 const struct sctp_chunk *chunk)
862{
863 struct sctp_chunk *retval;
864 __u8 flags = 0;
865
047a2428
JF		 866 /* Set the T-bit if we have no association (vtag will be
867 * reflected)
868 */
1da177e4
LT		 869 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
870
871 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
872
873 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
874 *
875 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
876 * HEARTBEAT ACK, * etc.) to the same destination transport
877 * address from which it * received the DATA or control chunk
878 * to which it is replying.
879 *
880 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
881 * came from.]
882 */
883 if (retval && chunk)
884 retval->transport = chunk->transport;
885
d808ad9a 886 return retval;
1da177e4
LT		 887}
888
889/* Create an ABORT. Note that we set the T bit if we have no
047a2428 890 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 891 */
892struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
893 const struct sctp_chunk *chunk,
894 const size_t hint)
895{
896 struct sctp_chunk *retval;
897 __u8 flags = 0;
898
047a2428
JF		 899 /* Set the T-bit if we have no association and 'chunk' is not
900 * an INIT (vtag will be reflected).
901 */
902 if (!asoc) {
903 if (chunk && chunk->chunk_hdr &&
904 chunk->chunk_hdr->type == SCTP_CID_INIT)
905 flags = 0;
906 else
907 flags = SCTP_CHUNK_FLAG_T;
908 }
1da177e4
LT		 909
910 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
911
912 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
913 *
914 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
915 * HEARTBEAT ACK, * etc.) to the same destination transport
916 * address from which it * received the DATA or control chunk
917 * to which it is replying.
918 *
919 * [ABORT back to where the offender came from.]
920 */
921 if (retval && chunk)
922 retval->transport = chunk->transport;
923
924 return retval;
925}
926
927/* Helper to create ABORT with a NO_USER_DATA error. */
928struct sctp_chunk *sctp_make_abort_no_data(
929 const struct sctp_association *asoc,
930 const struct sctp_chunk *chunk, __u32 tsn)
931{
932 struct sctp_chunk *retval;
9f81bcd9 933 __be32 payload;
1da177e4
LT		 934
935 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
936 + sizeof(tsn));
937
938 if (!retval)
939 goto no_mem;
940
941 /* Put the tsn back into network byte order. */
942 payload = htonl(tsn);
00f1c2df
WY		 943 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
944 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 945
946 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
947 *
948 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
949 * HEARTBEAT ACK, * etc.) to the same destination transport
950 * address from which it * received the DATA or control chunk
951 * to which it is replying.
952 *
953 * [ABORT back to where the offender came from.]
954 */
955 if (chunk)
956 retval->transport = chunk->transport;
957
958no_mem:
959 return retval;
960}
961
962/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
963struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 964 const struct msghdr *msg,
965 size_t paylen)
1da177e4
LT		 966{
967 struct sctp_chunk *retval;
c164a9ba
SS		 968 void *payload = NULL;
969 int err;
1da177e4 970
c164a9ba 971 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 972 if (!retval)
973 goto err_chunk;
974
975 if (paylen) {
976 /* Put the msg_iov together into payload. */
c164a9ba 977 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 978 if (!payload)
979 goto err_payload;
c164a9ba
SS		 980
981 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
982 if (err < 0)
983 goto err_copy;
1da177e4
LT		 984 }
985
00f1c2df
WY		 986 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
987 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 988
989 if (paylen)
990 kfree(payload);
991
992 return retval;
993
994err_copy:
995 kfree(payload);
996err_payload:
997 sctp_chunk_free(retval);
998 retval = NULL;
999err_chunk:
1000 return retval;
1001}
1002
5c94bf86
AB		 1003/* Append bytes to the end of a parameter. Will panic if chunk is not big
1004 * enough.
1005 */
1006static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1007 const void *data)
1008{
1009 void *target;
1010 int chunklen = ntohs(chunk->chunk_hdr->length);
1011
1012 target = skb_put(chunk->skb, len);
1013
6383cfb3
VY		 1014 if (data)
1015 memcpy(target, data, len);
1016 else
1017 memset(target, 0, len);
5c94bf86
AB		 1018
1019 /* Adjust the chunk length field. */
1020 chunk->chunk_hdr->length = htons(chunklen + len);
1021 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1022
1023 return target;
1024}
1025
d808ad9a 1026/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 1027struct sctp_chunk *sctp_make_abort_violation(
1028 const struct sctp_association *asoc,
1029 const struct sctp_chunk *chunk,
1030 const __u8 *payload,
1031 const size_t paylen)
1032{
1033 struct sctp_chunk *retval;
1034 struct sctp_paramhdr phdr;
1035
1036 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1037 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1038 if (!retval)
1039 goto end;
1040
00f1c2df
WY		 1041 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1042 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1043
1044 phdr.type = htons(chunk->chunk_hdr->type);
1045 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1046 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1048
1049end:
1050 return retval;
1051}
1052
ba016670
WY		 1053struct sctp_chunk *sctp_make_violation_paramlen(
1054 const struct sctp_association *asoc,
1055 const struct sctp_chunk *chunk,
1056 struct sctp_paramhdr *param)
1057{
1058 struct sctp_chunk *retval;
1059 static const char error[] = "The following parameter had invalid length:";
1060 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1061 sizeof(sctp_paramhdr_t);
1062
1063 retval = sctp_make_abort(asoc, chunk, payload_len);
1064 if (!retval)
1065 goto nodata;
1066
1067 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1068 sizeof(error) + sizeof(sctp_paramhdr_t));
1069 sctp_addto_chunk(retval, sizeof(error), error);
1070 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1071
1072nodata:
1073 return retval;
1074}
1075
1da177e4
LT		 1076/* Make a HEARTBEAT chunk. */
1077struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1078 const struct sctp_transport *transport,
1079 const void *payload, const size_t paylen)
1080{
1081 struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
1082 0, paylen);
1083
1084 if (!retval)
1085 goto nodata;
1086
1087 /* Cast away the 'const', as this is just telling the chunk
1088 * what transport it belongs to.
1089 */
1090 retval->transport = (struct sctp_transport *) transport;
1091 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1092
1093nodata:
1094 return retval;
1095}
1096
1097struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1098 const struct sctp_chunk *chunk,
1099 const void *payload, const size_t paylen)
1100{
1101 struct sctp_chunk *retval;
1102
1103 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1104 if (!retval)
1105 goto nodata;
1106
1107 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1108
1109 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1110 *
1111 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1112 * HEARTBEAT ACK, * etc.) to the same destination transport
1113 * address from which it * received the DATA or control chunk
1114 * to which it is replying.
1115 *
1116 * [HBACK back to where the HEARTBEAT came from.]
1117 */
1118 if (chunk)
1119 retval->transport = chunk->transport;
1120
1121nodata:
1122 return retval;
1123}
1124
1125/* Create an Operation Error chunk with the specified space reserved.
1126 * This routine can be used for containing multiple causes in the chunk.
1127 */
1128static struct sctp_chunk *sctp_make_op_error_space(
1129 const struct sctp_association *asoc,
1130 const struct sctp_chunk *chunk,
1131 size_t size)
1132{
1133 struct sctp_chunk *retval;
1134
1135 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1136 sizeof(sctp_errhdr_t) + size);
1137 if (!retval)
1138 goto nodata;
1139
1140 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1141 *
1142 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1143 * HEARTBEAT ACK, etc.) to the same destination transport
1144 * address from which it received the DATA or control chunk
1145 * to which it is replying.
1146 *
1147 */
1148 if (chunk)
1149 retval->transport = chunk->transport;
1150
1151nodata:
1152 return retval;
1153}
1154
5fa782c2
NH		 1155/* Create an Operation Error chunk of a fixed size,
1156 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1157 * This is a helper function to allocate an error chunk for
1158 * for those invalid parameter codes in which we may not want
1159 * to report all the errors, if the incomming chunk is large
1160 */
1161static inline struct sctp_chunk *sctp_make_op_error_fixed(
1162 const struct sctp_association *asoc,
1163 const struct sctp_chunk *chunk)
1164{
1165 size_t size = asoc ? asoc->pathmtu : 0;
1166
1167 if (!size)
1168 size = SCTP_DEFAULT_MAXSEGMENT;
1169
1170 return sctp_make_op_error_space(asoc, chunk, size);
1171}
1172
1da177e4
LT		 1173/* Create an Operation Error chunk. */
1174struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1175 const struct sctp_chunk *chunk,
63706c5c 1176 __be16 cause_code, const void *payload,
6383cfb3 1177 size_t paylen, size_t reserve_tail)
1da177e4
LT		 1178{
1179 struct sctp_chunk *retval;
1180
6383cfb3 1181 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1da177e4
LT		 1182 if (!retval)
1183 goto nodata;
1184
6383cfb3 1185 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
00f1c2df 1186 sctp_addto_chunk(retval, paylen, payload);
6383cfb3
VY		 1187 if (reserve_tail)
1188 sctp_addto_param(retval, reserve_tail, NULL);
1da177e4
LT		 1189
1190nodata:
1191 return retval;
1192}
1193
4cd57c80
VY		 1194struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1195{
1196 struct sctp_chunk *retval;
1197 struct sctp_hmac *hmac_desc;
1198 struct sctp_authhdr auth_hdr;
1199 __u8 *hmac;
1200
1201 /* Get the first hmac that the peer told us to use */
1202 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1203 if (unlikely(!hmac_desc))
1204 return NULL;
1205
1206 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1207 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1208 if (!retval)
1209 return NULL;
1210
1211 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1212 auth_hdr.shkey_id = htons(asoc->active_key_id);
1213
1214 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1215 &auth_hdr);
1216
1217 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1218 memset(hmac, 0, hmac_desc->hmac_len);
1219
1220 /* Adjust the chunk header to include the empty MAC */
1221 retval->chunk_hdr->length =
1222 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1223 retval->chunk_end = skb_tail_pointer(retval->skb);
1224
1225 return retval;
1226}
1227
1228
1da177e4
LT		 1229/********************************************************************
1230 * 2nd Level Abstractions
1231 ********************************************************************/
1232
1233/* Turn an skb into a chunk.
1234 * FIXME: Eventually move the structure directly inside the skb->cb[].
1235 */
1236struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1237 const struct sctp_association *asoc,
1238 struct sock *sk)
1239{
1240 struct sctp_chunk *retval;
1241
c3762229 1242 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1243
1244 if (!retval)
1245 goto nodata;
1da177e4
LT		 1246
1247 if (!sk) {
1248 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1249 }
1250
79af02c2 1251 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1252 retval->skb = skb;
1253 retval->asoc = (struct sctp_association *)asoc;
1da177e4
LT		 1254 retval->has_tsn = 0;
1255 retval->has_ssn = 0;
1256 retval->rtt_in_progress = 0;
1257 retval->sent_at = 0;
1258 retval->singleton = 1;
1259 retval->end_of_packet = 0;
1260 retval->ecn_ce_done = 0;
1261 retval->pdiscard = 0;
1262
1263 /* sctpimpguide-05.txt Section 2.8.2
1264 * M1) Each time a new DATA chunk is transmitted
1265 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1266 * 'TSN.Missing.Report' count will be used to determine missing chunks
1267 * and when to fast retransmit.
1268 */
1269 retval->tsn_missing_report = 0;
1270 retval->tsn_gap_acked = 0;
c226ef9b 1271 retval->fast_retransmit = SCTP_CAN_FRTX;
1da177e4
LT		 1272
1273 /* If this is a fragmented message, track all fragments
1274 * of the message (for SEND_FAILED).
1275 */
1276 retval->msg = NULL;
1277
1278 /* Polish the bead hole. */
1279 INIT_LIST_HEAD(&retval->transmitted_list);
1280 INIT_LIST_HEAD(&retval->frag_list);
1281 SCTP_DBG_OBJCNT_INC(chunk);
1282 atomic_set(&retval->refcnt, 1);
1283
1284nodata:
1285 return retval;
1286}
1287
1288/* Set chunk->source and dest based on the IP header in chunk->skb. */
1289void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1290 union sctp_addr *dest)
1291{
f235fca3 1292 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1293 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1294}
1295
1296/* Extract the source address from a chunk. */
1297const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1298{
1299 /* If we have a known transport, use that. */
1300 if (chunk->transport) {
6a1e5f33 1301 return &chunk->transport->ipaddr;
1da177e4
LT		 1302 } else {
1303 /* Otherwise, extract it from the IP header. */
6a1e5f33 1304 return &chunk->source;
1da177e4
LT		 1305 }
1306}
1307
1308/* Create a new chunk, setting the type and flags headers from the
1309 * arguments, reserving enough space for a 'paylen' byte payload.
1310 */
1311SCTP_STATIC
1312struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1313 __u8 type, __u8 flags, int paylen)
1314{
1315 struct sctp_chunk *retval;
1316 sctp_chunkhdr_t *chunk_hdr;
1317 struct sk_buff *skb;
1318 struct sock *sk;
1319
1320 /* No need to allocate LL here, as this is only a chunk. */
1321 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1322 GFP_ATOMIC);
1323 if (!skb)
1324 goto nodata;
1325
1326 /* Make room for the chunk header. */
1327 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1328 chunk_hdr->type = type;
1329 chunk_hdr->flags = flags;
1330 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1331
1332 sk = asoc ? asoc->base.sk : NULL;
1333 retval = sctp_chunkify(skb, asoc, sk);
1334 if (!retval) {
1335 kfree_skb(skb);
1336 goto nodata;
1337 }
1338
1339 retval->chunk_hdr = chunk_hdr;
1340 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1341
4cd57c80
VY		 1342 /* Determine if the chunk needs to be authenticated */
1343 if (sctp_auth_send_cid(type, asoc))
1344 retval->auth = 1;
1345
1da177e4
LT		 1346 /* Set the skb to the belonging sock for accounting. */
1347 skb->sk = sk;
1348
1349 return retval;
1350nodata:
1351 return NULL;
1352}
1353
1354
1355/* Release the memory occupied by a chunk. */
1356static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1357{
a08de64d
VY		 1358 BUG_ON(!list_empty(&chunk->list));
1359 list_del_init(&chunk->transmitted_list);
1360
1da177e4
LT		 1361 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1362 dev_kfree_skb(chunk->skb);
1363
1364 SCTP_DBG_OBJCNT_DEC(chunk);
1365 kmem_cache_free(sctp_chunk_cachep, chunk);
1366}
1367
1368/* Possibly, free the chunk. */
1369void sctp_chunk_free(struct sctp_chunk *chunk)
1370{
1da177e4
LT		 1371 /* Release our reference on the message tracker. */
1372 if (chunk->msg)
1373 sctp_datamsg_put(chunk->msg);
1374
1375 sctp_chunk_put(chunk);
1376}
1377
1378/* Grab a reference to the chunk. */
1379void sctp_chunk_hold(struct sctp_chunk *ch)
1380{
1381 atomic_inc(&ch->refcnt);
1382}
1383
1384/* Release a reference to the chunk. */
1385void sctp_chunk_put(struct sctp_chunk *ch)
1386{
1387 if (atomic_dec_and_test(&ch->refcnt))
1388 sctp_chunk_destroy(ch);
1389}
1390
1391/* Append bytes to the end of a chunk. Will panic if chunk is not big
1392 * enough.
1393 */
1394void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1395{
1396 void *target;
1397 void *padding;
1398 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1399 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1400
1401 padding = skb_put(chunk->skb, padlen);
1402 target = skb_put(chunk->skb, len);
1403
1404 memset(padding, 0, padlen);
1405 memcpy(target, data, len);
1406
1407 /* Adjust the chunk length field. */
1408 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1409 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1410
1411 return target;
1412}
1413
5fa782c2
NH		 1414/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1415 * space in the chunk
1416 */
1417void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1418 int len, const void *data)
1419{
2e3219b5 1420 if (skb_tailroom(chunk->skb) >= len)
5fa782c2
NH		 1421 return sctp_addto_chunk(chunk, len, data);
1422 else
1423 return NULL;
1424}
1425
1da177e4
LT		 1426/* Append bytes from user space to the end of a chunk. Will panic if
1427 * chunk is not big enough.
1428 * Returns a kernel err value.
1429 */
1430int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1431 struct iovec *data)
1432{
1433 __u8 *target;
1434 int err = 0;
1435
1436 /* Make room in chunk for data. */
1437 target = skb_put(chunk->skb, len);
1438
1439 /* Copy data (whole iovec) into chunk */
1440 if ((err = memcpy_fromiovecend(target, data, off, len)))
1441 goto out;
1442
1443 /* Adjust the chunk length field. */
1444 chunk->chunk_hdr->length =
1445 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1446 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1447
1448out:
1449 return err;
1450}
1451
1452/* Helper function to assign a TSN if needed. This assumes that both
1453 * the data_hdr and association have already been assigned.
1454 */
1455void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1456{
ab3e5e7b
VY		 1457 struct sctp_datamsg *msg;
1458 struct sctp_chunk *lchunk;
1459 struct sctp_stream *stream;
1da177e4
LT		 1460 __u16 ssn;
1461 __u16 sid;
1462
1463 if (chunk->has_ssn)
1464 return;
1465
ab3e5e7b
VY		 1466 /* All fragments will be on the same stream */
1467 sid = ntohs(chunk->subh.data_hdr->stream);
1468 stream = &chunk->asoc->ssnmap->out;
1da177e4 1469
ab3e5e7b
VY		 1470 /* Now assign the sequence number to the entire message.
1471 * All fragments must have the same stream sequence number.
1472 */
1473 msg = chunk->msg;
1474 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1475 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1476 ssn = 0;
1477 } else {
1478 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1479 ssn = sctp_ssn_next(stream, sid);
1480 else
1481 ssn = sctp_ssn_peek(stream, sid);
1482 }
1483
1484 lchunk->subh.data_hdr->ssn = htons(ssn);
1485 lchunk->has_ssn = 1;
1486 }
1da177e4
LT		 1487}
1488
1489/* Helper function to assign a TSN if needed. This assumes that both
1490 * the data_hdr and association have already been assigned.
1491 */
1492void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1493{
1494 if (!chunk->has_tsn) {
1495 /* This is the last possible instant to
1496 * assign a TSN.
1497 */
1498 chunk->subh.data_hdr->tsn =
1499 htonl(sctp_association_get_next_tsn(chunk->asoc));
1500 chunk->has_tsn = 1;
1501 }
1502}
1503
1504/* Create a CLOSED association to use with an incoming packet. */
1505struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1506 struct sctp_chunk *chunk,
dd0fc66f 1507 gfp_t gfp)
1da177e4
LT		 1508{
1509 struct sctp_association *asoc;
1510 struct sk_buff *skb;
1511 sctp_scope_t scope;
1512 struct sctp_af *af;
1513
1514 /* Create the bare association. */
1515 scope = sctp_scope(sctp_source(chunk));
1516 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1517 if (!asoc)
1518 goto nodata;
1519 asoc->temp = 1;
1520 skb = chunk->skb;
1521 /* Create an entry for the source address of the packet. */
eddc9ec5 1522 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1523 if (unlikely(!af))
1524 goto fail;
d55c41b1 1525 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1526nodata:
1527 return asoc;
1528
1529fail:
1530 sctp_association_free(asoc);
1531 return NULL;
1532}
1533
1534/* Build a cookie representing asoc.
1535 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1536 */
1537static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1538 const struct sctp_association *asoc,
1539 const struct sctp_chunk *init_chunk,
1540 int *cookie_len,
1541 const __u8 *raw_addrs, int addrs_len)
1542{
1543 sctp_cookie_param_t *retval;
1544 struct sctp_signed_cookie *cookie;
1545 struct scatterlist sg;
1546 int headersize, bodysize;
1547 unsigned int keylen;
1548 char *key;
1549
9834a2bb
VY		 1550 /* Header size is static data prior to the actual cookie, including
1551 * any padding.
1552 */
d808ad9a
YH		 1553 headersize = sizeof(sctp_paramhdr_t) +
1554 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1555 sizeof(struct sctp_cookie));
1da177e4
LT		 1556 bodysize = sizeof(struct sctp_cookie)
1557 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1558
1559 /* Pad out the cookie to a multiple to make the signature
1560 * functions simpler to write.
1561 */
1562 if (bodysize % SCTP_COOKIE_MULTIPLE)
1563 bodysize += SCTP_COOKIE_MULTIPLE
1564 - (bodysize % SCTP_COOKIE_MULTIPLE);
1565 *cookie_len = headersize + bodysize;
1566
1da177e4
LT		 1567 /* Clear this memory since we are sending this data structure
1568 * out on the network.
1569 */
af997d8c
ACM		 1570 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1571 if (!retval)
1572 goto nodata;
1573
1da177e4
LT		 1574 cookie = (struct sctp_signed_cookie *) retval->body;
1575
1576 /* Set up the parameter header. */
1577 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1578 retval->p.length = htons(*cookie_len);
1579
1580 /* Copy the cookie part of the association itself. */
1581 cookie->c = asoc->c;
1582 /* Save the raw address list length in the cookie. */
1583 cookie->c.raw_addr_list_len = addrs_len;
1584
1585 /* Remember PR-SCTP capability. */
1586 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1587
0f3fffd8
ISJ		 1588 /* Save adaptation indication in the cookie. */
1589 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1590
1591 /* Set an expiration time for the cookie. */
1592 do_gettimeofday(&cookie->c.expiration);
1593 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1594
1595 /* Copy the peer's init packet. */
1596 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1597 ntohs(init_chunk->chunk_hdr->length));
1598
1599 /* Copy the raw local address list of the association. */
1600 memcpy((__u8 *)&cookie->c.peer_init[0] +
1601 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1602
d808ad9a 1603 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1604 struct hash_desc desc;
1605
1da177e4 1606 /* Sign the message. */
68e3f5dd 1607 sg_init_one(&sg, &cookie->c, bodysize);
1da177e4
LT		 1608 keylen = SCTP_SECRET_SIZE;
1609 key = (char *)ep->secret_key[ep->current_key];
d808ad9a
YH		 1610 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1611 desc.flags = 0;
1da177e4 1612
1b489e11
HX		 1613 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1614 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1615 goto free_cookie;
1da177e4
LT		 1616 }
1617
1da177e4 1618 return retval;
1b489e11
HX		 1619
1620free_cookie:
1621 kfree(retval);
1622nodata:
1623 *cookie_len = 0;
1624 return NULL;
1da177e4
LT		 1625}
1626
1627/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1628struct sctp_association *sctp_unpack_cookie(
1629 const struct sctp_endpoint *ep,
1630 const struct sctp_association *asoc,
dd0fc66f 1631 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1632 int *error, struct sctp_chunk **errp)
1633{
1634 struct sctp_association *retval = NULL;
1635 struct sctp_signed_cookie *cookie;
1636 struct sctp_cookie *bear_cookie;
1637 int headersize, bodysize, fixed_size;
313e7b4d 1638 __u8 *digest = ep->digest;
1da177e4
LT		 1639 struct scatterlist sg;
1640 unsigned int keylen, len;
1641 char *key;
1642 sctp_scope_t scope;
1643 struct sk_buff *skb = chunk->skb;
a61bbcf2 1644 struct timeval tv;
1b489e11 1645 struct hash_desc desc;
1da177e4 1646
9834a2bb
VY		 1647 /* Header size is static data prior to the actual cookie, including
1648 * any padding.
1649 */
1650 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1651 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1652 sizeof(struct sctp_cookie));
1da177e4
LT		 1653 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1654 fixed_size = headersize + sizeof(struct sctp_cookie);
1655
1656 /* Verify that the chunk looks like it even has a cookie.
1657 * There must be enough room for our cookie and our peer's
1658 * INIT chunk.
1659 */
1660 len = ntohs(chunk->chunk_hdr->length);
1661 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1662 goto malformed;
1663
1664 /* Verify that the cookie has been padded out. */
1665 if (bodysize % SCTP_COOKIE_MULTIPLE)
1666 goto malformed;
1667
1668 /* Process the cookie. */
1669 cookie = chunk->subh.cookie_hdr;
1670 bear_cookie = &cookie->c;
1671
1672 if (!sctp_sk(ep->base.sk)->hmac)
1673 goto no_hmac;
1674
1675 /* Check the signature. */
1676 keylen = SCTP_SECRET_SIZE;
68e3f5dd 1677 sg_init_one(&sg, bear_cookie, bodysize);
1da177e4 1678 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1679 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1680 desc.flags = 0;
1da177e4 1681
8ca84481 1682 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1683 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1684 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1685 *error = -SCTP_IERROR_NOMEM;
1686 goto fail;
1687 }
1da177e4
LT		 1688
1689 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1690 /* Try the previous key. */
1691 key = (char *)ep->secret_key[ep->last_key];
8ca84481 1692 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1693 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1694 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1695 *error = -SCTP_IERROR_NOMEM;
1696 goto fail;
1697 }
1da177e4
LT		 1698
1699 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1700 /* Yikes! Still bad signature! */
1701 *error = -SCTP_IERROR_BAD_SIG;
1702 goto fail;
1703 }
1704 }
1705
1706no_hmac:
1707 /* IG Section 2.35.2:
1708 * 3) Compare the port numbers and the verification tag contained
1709 * within the COOKIE ECHO chunk to the actual port numbers and the
1710 * verification tag within the SCTP common header of the received
1711 * packet. If these values do not match the packet MUST be silently
1712 * discarded,
1713 */
1714 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1715 *error = -SCTP_IERROR_BAD_TAG;
1716 goto fail;
1717 }
1718
9b1dfad0 1719 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1720 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1721 *error = -SCTP_IERROR_BAD_PORTS;
1722 goto fail;
1723 }
1724
1725 /* Check to see if the cookie is stale. If there is already
1726 * an association, there is no need to check cookie's expiration
1727 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1728 * If skb has been timestamped, then use the stamp, otherwise
1729 * use current time. This introduces a small possibility that
1730 * that a cookie may be considered expired, but his would only slow
1731 * down the new association establishment instead of every packet.
1da177e4 1732 */
f236218b
VY		 1733 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1734 skb_get_timestamp(skb, &tv);
1735 else
1736 do_gettimeofday(&tv);
1737
a61bbcf2 1738 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1da177e4
LT		 1739 /*
1740 * Section 3.3.10.3 Stale Cookie Error (3)
1741 *
1742 * Cause of error
1743 * ---------------
1744 * Stale Cookie Error: Indicates the receipt of a valid State
1745 * Cookie that has expired.
1746 */
1747 len = ntohs(chunk->chunk_hdr->length);
1748 *errp = sctp_make_op_error_space(asoc, chunk, len);
1749 if (*errp) {
a61bbcf2 1750 suseconds_t usecs = (tv.tv_sec -
1da177e4 1751 bear_cookie->expiration.tv_sec) * 1000000L +
a61bbcf2 1752 tv.tv_usec - bear_cookie->expiration.tv_usec;
34bcca28 1753 __be32 n = htonl(usecs);
1da177e4 1754
1da177e4 1755 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1756 sizeof(n));
1757 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1758 *error = -SCTP_IERROR_STALE_COOKIE;
1759 } else
1760 *error = -SCTP_IERROR_NOMEM;
1761
1762 goto fail;
1763 }
1764
1765 /* Make a new base association. */
1766 scope = sctp_scope(sctp_source(chunk));
1767 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1768 if (!retval) {
1769 *error = -SCTP_IERROR_NOMEM;
1770 goto fail;
1771 }
1772
1773 /* Set up our peer's port number. */
1774 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1775
1776 /* Populate the association from the cookie. */
1777 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1778
1779 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1780 GFP_ATOMIC) < 0) {
1781 *error = -SCTP_IERROR_NOMEM;
1782 goto fail;
1783 }
1784
1785 /* Also, add the destination address. */
1786 if (list_empty(&retval->base.bind_addr.address_list)) {
f57d96b2
VY		 1787 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1788 SCTP_ADDR_SRC, GFP_ATOMIC);
1da177e4
LT		 1789 }
1790
1791 retval->next_tsn = retval->c.initial_tsn;
1792 retval->ctsn_ack_point = retval->next_tsn - 1;
1793 retval->addip_serial = retval->c.initial_tsn;
1794 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1795 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1796 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1797
1798 /* The INIT stuff will be done by the side effects. */
1799 return retval;
1800
1801fail:
1802 if (retval)
1803 sctp_association_free(retval);
1804
1805 return NULL;
1806
1807malformed:
1808 /* Yikes! The packet is either corrupt or deliberately
1809 * malformed.
1810 */
1811 *error = -SCTP_IERROR_MALFORMED;
1812 goto fail;
1813}
1814
1815/********************************************************************
1816 * 3rd Level Abstractions
1817 ********************************************************************/
1818
1819struct __sctp_missing {
9f81bcd9
AV		 1820 __be32 num_missing;
1821 __be16 type;
bc10502d 1822} __packed;
1da177e4
LT		 1823
1824/*
1825 * Report a missing mandatory parameter.
1826 */
1827static int sctp_process_missing_param(const struct sctp_association *asoc,
1828 sctp_param_t paramtype,
1829 struct sctp_chunk *chunk,
1830 struct sctp_chunk **errp)
1831{
1832 struct __sctp_missing report;
1833 __u16 len;
1834
1835 len = WORD_ROUND(sizeof(report));
1836
1837 /* Make an ERROR chunk, preparing enough room for
1838 * returning multiple unknown parameters.
1839 */
1840 if (!*errp)
1841 *errp = sctp_make_op_error_space(asoc, chunk, len);
1842
1843 if (*errp) {
1844 report.num_missing = htonl(1);
1845 report.type = paramtype;
ebdfcad4 1846 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1847 sizeof(report));
1848 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1849 }
1850
1851 /* Stop processing this chunk. */
1852 return 0;
1853}
1854
1855/* Report an Invalid Mandatory Parameter. */
1856static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1857 struct sctp_chunk *chunk,
1858 struct sctp_chunk **errp)
1859{
1860 /* Invalid Mandatory Parameter Error has no payload. */
1861
1862 if (!*errp)
1863 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1864
1865 if (*errp)
00f1c2df 1866 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1867
1868 /* Stop processing this chunk. */
1869 return 0;
1870}
1871
1872static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1873 struct sctp_paramhdr *param,
1874 const struct sctp_chunk *chunk,
1875 struct sctp_chunk **errp)
1876{
7ab90804
VY		 1877 /* This is a fatal error. Any accumulated non-fatal errors are
1878 * not reported.
1879 */
1880 if (*errp)
1881 sctp_chunk_free(*errp);
1882
1da177e4 1883 /* Create an error chunk and fill it in with our payload. */
ba016670 1884 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1da177e4
LT		 1885
1886 return 0;
1887}
1888
1889
1890/* Do not attempt to handle the HOST_NAME parm. However, do
1891 * send back an indicator to the peer.
1892 */
1893static int sctp_process_hn_param(const struct sctp_association *asoc,
1894 union sctp_params param,
1895 struct sctp_chunk *chunk,
1896 struct sctp_chunk **errp)
1897{
1898 __u16 len = ntohs(param.p->length);
1899
7ab90804
VY		 1900 /* Processing of the HOST_NAME parameter will generate an
1901 * ABORT. If we've accumulated any non-fatal errors, they
1902 * would be unrecognized parameters and we should not include
1903 * them in the ABORT.
1904 */
1905 if (*errp)
1906 sctp_chunk_free(*errp);
1907
1908 *errp = sctp_make_op_error_space(asoc, chunk, len);
1da177e4 1909
00f1c2df
WY		 1910 if (*errp) {
1911 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1912 sctp_addto_chunk(*errp, len, param.v);
1913 }
1da177e4
LT		 1914
1915 /* Stop processing this chunk. */
1916 return 0;
1917}
1918
d6701191
VY		 1919static int sctp_verify_ext_param(union sctp_params param)
1920{
1921 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1922 int have_auth = 0;
1923 int have_asconf = 0;
1924 int i;
1925
1926 for (i = 0; i < num_ext; i++) {
1927 switch (param.ext->chunks[i]) {
1928 case SCTP_CID_AUTH:
1929 have_auth = 1;
1930 break;
1931 case SCTP_CID_ASCONF:
1932 case SCTP_CID_ASCONF_ACK:
1933 have_asconf = 1;
1934 break;
1935 }
1936 }
1937
1938 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1939 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1940 * only if ADD-IP is turned on and we are not backward-compatible
1941 * mode.
1942 */
1943 if (sctp_addip_noauth)
1944 return 1;
1945
1946 if (sctp_addip_enable && !have_auth && have_asconf)
1947 return 0;
1948
1949 return 1;
1950}
1951
131a47e3
VY		 1952static void sctp_process_ext_param(struct sctp_association *asoc,
1953 union sctp_params param)
1954{
1955 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1956 int i;
1957
1958 for (i = 0; i < num_ext; i++) {
1959 switch (param.ext->chunks[i]) {
1960 case SCTP_CID_FWD_TSN:
1961 if (sctp_prsctp_enable &&
1962 !asoc->peer.prsctp_capable)
1963 asoc->peer.prsctp_capable = 1;
1964 break;
730fc3d0
VY		 1965 case SCTP_CID_AUTH:
1966 /* if the peer reports AUTH, assume that he
1967 * supports AUTH.
1968 */
0ef46e28
VY		 1969 if (sctp_auth_enable)
1970 asoc->peer.auth_capable = 1;
730fc3d0 1971 break;
131a47e3
VY		 1972 case SCTP_CID_ASCONF:
1973 case SCTP_CID_ASCONF_ACK:
0ef46e28
VY		 1974 if (sctp_addip_enable)
1975 asoc->peer.asconf_capable = 1;
6b2f9cb6 1976 break;
131a47e3
VY		 1977 default:
1978 break;
1979 }
1980 }
1981}
1982
1da177e4
LT		 1983/* RFC 3.2.1 & the Implementers Guide 2.2.
1984 *
1985 * The Parameter Types are encoded such that the
1986 * highest-order two bits specify the action that must be
1987 * taken if the processing endpoint does not recognize the
1988 * Parameter Type.
1989 *
7ab90804
VY		 1990 * 00 - Stop processing this parameter; do not process any further
1991 * parameters within this chunk
1da177e4 1992 *
7ab90804
VY		 1993 * 01 - Stop processing this parameter, do not process any further
1994 * parameters within this chunk, and report the unrecognized
1995 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 1996 *
1997 * 10 - Skip this parameter and continue processing.
1998 *
1999 * 11 - Skip this parameter and continue processing but
2000 * report the unrecognized parameter in an
7ab90804 2001 * 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2002 *
2003 * Return value:
7ab90804
VY		 2004 * SCTP_IERROR_NO_ERROR - continue with the chunk
2005 * SCTP_IERROR_ERROR - stop and report an error.
2006 * SCTP_IERROR_NOMEME - out of memory.
1da177e4 2007 */
7ab90804
VY		 2008static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2009 union sctp_params param,
2010 struct sctp_chunk *chunk,
2011 struct sctp_chunk **errp)
1da177e4 2012{
7ab90804 2013 int retval = SCTP_IERROR_NO_ERROR;
1da177e4
LT		 2014
2015 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2016 case SCTP_PARAM_ACTION_DISCARD:
7ab90804 2017 retval = SCTP_IERROR_ERROR;
1da177e4
LT		 2018 break;
2019 case SCTP_PARAM_ACTION_SKIP:
2020 break;
7ab90804
VY		 2021 case SCTP_PARAM_ACTION_DISCARD_ERR:
2022 retval = SCTP_IERROR_ERROR;
2023 /* Fall through */
1da177e4
LT		 2024 case SCTP_PARAM_ACTION_SKIP_ERR:
2025 /* Make an ERROR chunk, preparing enough room for
2026 * returning multiple unknown parameters.
2027 */
2028 if (NULL == *errp)
5fa782c2 2029 *errp = sctp_make_op_error_fixed(asoc, chunk);
1da177e4
LT		 2030
2031 if (*errp) {
5fa782c2 2032 sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1da177e4 2033 WORD_ROUND(ntohs(param.p->length)));
5fa782c2 2034 sctp_addto_chunk_fixed(*errp,
00f1c2df
WY		 2035 WORD_ROUND(ntohs(param.p->length)),
2036 param.v);
1da177e4
LT		 2037 } else {
2038 /* If there is no memory for generating the ERROR
2039 * report as specified, an ABORT will be triggered
2040 * to the peer and the association won't be
2041 * established.
2042 */
7ab90804 2043 retval = SCTP_IERROR_NOMEM;
1da177e4 2044 }
1da177e4
LT		 2045 break;
2046 default:
2047 break;
2048 }
2049
2050 return retval;
2051}
2052
7ab90804 2053/* Verify variable length parameters
1da177e4 2054 * Return values:
7ab90804
VY		 2055 * SCTP_IERROR_ABORT - trigger an ABORT
2056 * SCTP_IERROR_NOMEM - out of memory (abort)
2057 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2058 * SCTP_IERROR_NO_ERROR - continue with the chunk
1da177e4 2059 */
7ab90804
VY		 2060static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2061 union sctp_params param,
2062 sctp_cid_t cid,
2063 struct sctp_chunk *chunk,
2064 struct sctp_chunk **err_chunk)
1da177e4 2065{
72da7b38 2066 struct sctp_hmac_algo_param *hmacs;
7ab90804 2067 int retval = SCTP_IERROR_NO_ERROR;
72da7b38
WY		 2068 __u16 n_elt, id = 0;
2069 int i;
1da177e4
LT		 2070
2071 /* FIXME - This routine is not looking at each parameter per the
2072 * chunk type, i.e., unrecognized parameters should be further
2073 * identified based on the chunk id.
2074 */
2075
2076 switch (param.p->type) {
2077 case SCTP_PARAM_IPV4_ADDRESS:
2078 case SCTP_PARAM_IPV6_ADDRESS:
2079 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2080 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2081 case SCTP_PARAM_STATE_COOKIE:
2082 case SCTP_PARAM_HEARTBEAT_INFO:
2083 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2084 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 2085 case SCTP_PARAM_ADAPTATION_LAYER_IND:
d6701191
VY		 2086 break;
2087
131a47e3 2088 case SCTP_PARAM_SUPPORTED_EXT:
d6701191
VY		 2089 if (!sctp_verify_ext_param(param))
2090 return SCTP_IERROR_ABORT;
1da177e4
LT		 2091 break;
2092
d6de3097
VY		 2093 case SCTP_PARAM_SET_PRIMARY:
2094 if (sctp_addip_enable)
2095 break;
2096 goto fallthrough;
2097
1da177e4
LT		 2098 case SCTP_PARAM_HOST_NAME_ADDRESS:
2099 /* Tell the peer, we won't support this param. */
7ab90804
VY		 2100 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2101 retval = SCTP_IERROR_ABORT;
2102 break;
131a47e3 2103
1da177e4
LT		 2104 case SCTP_PARAM_FWD_TSN_SUPPORT:
2105 if (sctp_prsctp_enable)
2106 break;
730fc3d0
VY		 2107 goto fallthrough;
2108
2109 case SCTP_PARAM_RANDOM:
2110 if (!sctp_auth_enable)
2111 goto fallthrough;
2112
2113 /* SCTP-AUTH: Secion 6.1
2114 * If the random number is not 32 byte long the association
2115 * MUST be aborted. The ABORT chunk SHOULD contain the error
2116 * cause 'Protocol Violation'.
2117 */
2118 if (SCTP_AUTH_RANDOM_LENGTH !=
7ab90804
VY		 2119 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2120 sctp_process_inv_paramlength(asoc, param.p,
730fc3d0 2121 chunk, err_chunk);
7ab90804
VY		 2122 retval = SCTP_IERROR_ABORT;
2123 }
730fc3d0
VY		 2124 break;
2125
2126 case SCTP_PARAM_CHUNKS:
2127 if (!sctp_auth_enable)
2128 goto fallthrough;
2129
2130 /* SCTP-AUTH: Section 3.2
2131 * The CHUNKS parameter MUST be included once in the INIT or
2132 * INIT-ACK chunk if the sender wants to receive authenticated
2133 * chunks. Its maximum length is 260 bytes.
2134 */
7ab90804
VY		 2135 if (260 < ntohs(param.p->length)) {
2136 sctp_process_inv_paramlength(asoc, param.p,
2137 chunk, err_chunk);
2138 retval = SCTP_IERROR_ABORT;
2139 }
730fc3d0
VY		 2140 break;
2141
2142 case SCTP_PARAM_HMAC_ALGO:
72da7b38
WY		 2143 if (!sctp_auth_enable)
2144 goto fallthrough;
2145
2146 hmacs = (struct sctp_hmac_algo_param *)param.p;
2147 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2148
2149 /* SCTP-AUTH: Section 6.1
2150 * The HMAC algorithm based on SHA-1 MUST be supported and
2151 * included in the HMAC-ALGO parameter.
2152 */
2153 for (i = 0; i < n_elt; i++) {
2154 id = ntohs(hmacs->hmac_ids[i]);
2155
2156 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2157 break;
2158 }
2159
2160 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2161 sctp_process_inv_paramlength(asoc, param.p, chunk,
2162 err_chunk);
2163 retval = SCTP_IERROR_ABORT;
2164 }
2165 break;
730fc3d0 2166fallthrough:
1da177e4
LT		 2167 default:
2168 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2169 ntohs(param.p->type), cid);
7ab90804 2170 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
1da177e4
LT		 2171 break;
2172 }
2173 return retval;
2174}
2175
2176/* Verify the INIT packet before we process it. */
2177int sctp_verify_init(const struct sctp_association *asoc,
2178 sctp_cid_t cid,
2179 sctp_init_chunk_t *peer_init,
2180 struct sctp_chunk *chunk,
2181 struct sctp_chunk **errp)
2182{
2183 union sctp_params param;
2184 int has_cookie = 0;
7ab90804 2185 int result;
1da177e4
LT		 2186
2187 /* Verify stream values are non-zero. */
2188 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
d023f629
VY		 2189 (0 == peer_init->init_hdr.num_inbound_streams) ||
2190 (0 == peer_init->init_hdr.init_tag) ||
2191 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
1da177e4 2192
7ab90804 2193 return sctp_process_inv_mandatory(asoc, chunk, errp);
1da177e4
LT		 2194 }
2195
2196 /* Check for missing mandatory parameters. */
2197 sctp_walk_params(param, peer_init, init_hdr.params) {
2198
2199 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2200 has_cookie = 1;
2201
2202 } /* for (loop through all parameters) */
2203
2204 /* There is a possibility that a parameter length was bad and
2205 * in that case we would have stoped walking the parameters.
2206 * The current param.p would point at the bad one.
2207 * Current consensus on the mailing list is to generate a PROTOCOL
2208 * VIOLATION error. We build the ERROR chunk here and let the normal
2209 * error handling code build and send the packet.
2210 */
7ab90804
VY		 2211 if (param.v != (void*)chunk->chunk_end)
2212 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
1da177e4
LT		 2213
2214 /* The only missing mandatory param possible today is
2215 * the state cookie for an INIT-ACK chunk.
2216 */
7ab90804
VY		 2217 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2218 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2219 chunk, errp);
1da177e4 2220
7ab90804 2221 /* Verify all the variable length parameters */
1da177e4
LT		 2222 sctp_walk_params(param, peer_init, init_hdr.params) {
2223
7ab90804
VY		 2224 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2225 switch (result) {
2226 case SCTP_IERROR_ABORT:
2227 case SCTP_IERROR_NOMEM:
1da177e4 2228 return 0;
7ab90804 2229 case SCTP_IERROR_ERROR:
1da177e4 2230 return 1;
7ab90804
VY		 2231 case SCTP_IERROR_NO_ERROR:
2232 default:
2233 break;
1da177e4
LT		 2234 }
2235
2236 } /* for (loop through all parameters) */
2237
2238 return 1;
2239}
2240
2241/* Unpack the parameters in an INIT packet into an association.
2242 * Returns 0 on failure, else success.
2243 * FIXME: This is an association method.
2244 */
2245int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
2246 const union sctp_addr *peer_addr,
dd0fc66f 2247 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4
LT		 2248{
2249 union sctp_params param;
2250 struct sctp_transport *transport;
2251 struct list_head *pos, *temp;
2252 char *cookie;
2253
2254 /* We must include the address that the INIT packet came from.
2255 * This is the only address that matters for an INIT packet.
2256 * When processing a COOKIE ECHO, we retrieve the from address
2257 * of the INIT from the cookie.
2258 */
2259
2260 /* This implementation defaults to making the first transport
2261 * added as the primary transport. The source address seems to
2262 * be a a better choice than any of the embedded addresses.
2263 */
4bdf4b5f 2264 if (peer_addr) {
6a1e5f33 2265 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
1da177e4 2266 goto nomem;
4bdf4b5f 2267 }
1da177e4
LT		 2268
2269 /* Process the initialization parameters. */
1da177e4
LT		 2270 sctp_walk_params(param, peer_init, init_hdr.params) {
2271
2272 if (!sctp_process_param(asoc, param, peer_addr, gfp))
d808ad9a 2273 goto clean_up;
1da177e4
LT		 2274 }
2275
730fc3d0
VY		 2276 /* AUTH: After processing the parameters, make sure that we
2277 * have all the required info to potentially do authentications.
2278 */
2279 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2280 !asoc->peer.peer_hmacs))
2281 asoc->peer.auth_capable = 0;
2282
d6701191
VY		 2283 /* In a non-backward compatible mode, if the peer claims
2284 * support for ADD-IP but not AUTH, the ADD-IP spec states
2285 * that we MUST ABORT the association. Section 6. The section
2286 * also give us an option to silently ignore the packet, which
2287 * is what we'll do here.
6b2f9cb6 2288 */
73d9c4fd
VY		 2289 if (!sctp_addip_noauth &&
2290 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
6b2f9cb6
VY		 2291 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2292 SCTP_PARAM_DEL_IP |
2293 SCTP_PARAM_SET_PRIMARY);
88799fe5 2294 asoc->peer.asconf_capable = 0;
d6701191 2295 goto clean_up;
6b2f9cb6
VY		 2296 }
2297
3f7a87d2
FF		 2298 /* Walk list of transports, removing transports in the UNKNOWN state. */
2299 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2300 transport = list_entry(pos, struct sctp_transport, transports);
2301 if (transport->state == SCTP_UNKNOWN) {
2302 sctp_assoc_rm_peer(asoc, transport);
2303 }
2304 }
2305
1da177e4
LT		 2306 /* The fixed INIT headers are always in network byte
2307 * order.
2308 */
2309 asoc->peer.i.init_tag =
2310 ntohl(peer_init->init_hdr.init_tag);
2311 asoc->peer.i.a_rwnd =
2312 ntohl(peer_init->init_hdr.a_rwnd);
2313 asoc->peer.i.num_outbound_streams =
2314 ntohs(peer_init->init_hdr.num_outbound_streams);
2315 asoc->peer.i.num_inbound_streams =
2316 ntohs(peer_init->init_hdr.num_inbound_streams);
2317 asoc->peer.i.initial_tsn =
2318 ntohl(peer_init->init_hdr.initial_tsn);
2319
2320 /* Apply the upper bounds for output streams based on peer's
2321 * number of inbound streams.
2322 */
2323 if (asoc->c.sinit_num_ostreams >
2324 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2325 asoc->c.sinit_num_ostreams =
2326 ntohs(peer_init->init_hdr.num_inbound_streams);
2327 }
2328
2329 if (asoc->c.sinit_max_instreams >
2330 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2331 asoc->c.sinit_max_instreams =
2332 ntohs(peer_init->init_hdr.num_outbound_streams);
2333 }
2334
2335 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2336 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2337
2338 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2339 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2340
2341 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2342 cookie = asoc->peer.cookie;
2343 if (cookie) {
af997d8c 2344 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
1da177e4
LT		 2345 if (!asoc->peer.cookie)
2346 goto clean_up;
1da177e4
LT		 2347 }
2348
2349 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2350 * high (for example, implementations MAY use the size of the receiver
2351 * advertised window).
2352 */
9dbc15f0
RD		 2353 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2354 transports) {
1da177e4
LT		 2355 transport->ssthresh = asoc->peer.i.a_rwnd;
2356 }
2357
2358 /* Set up the TSN tracking pieces. */
8e1ee18c
VY		 2359 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2360 asoc->peer.i.initial_tsn, gfp))
2361 goto clean_up;
1da177e4
LT		 2362
2363 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2364 *
2365 * The stream sequence number in all the streams shall start
2366 * from 0 when the association is established. Also, when the
2367 * stream sequence number reaches the value 65535 the next
2368 * stream sequence number shall be set to 0.
2369 */
2370
3f7a87d2 2371 /* Allocate storage for the negotiated streams if it is not a temporary
d808ad9a 2372 * association.
1da177e4
LT		 2373 */
2374 if (!asoc->temp) {
1da177e4
LT		 2375 int error;
2376
2377 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2378 asoc->c.sinit_num_ostreams, gfp);
2379 if (!asoc->ssnmap)
2380 goto clean_up;
2381
07d93967
VY		 2382 error = sctp_assoc_set_id(asoc, gfp);
2383 if (error)
1da177e4 2384 goto clean_up;
1da177e4
LT		 2385 }
2386
2387 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2388 *
2389 * When an endpoint has an ASCONF signaled change to be sent to the
2390 * remote endpoint it should do the following:
2391 * ...
2392 * A2) A serial number should be assigned to the Chunk. The serial
2393 * number should be a monotonically increasing number. All serial
2394 * numbers are defined to be initialized at the start of the
2395 * association to the same value as the Initial TSN.
2396 */
2397 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2398 return 1;
2399
2400clean_up:
2401 /* Release the transport structures. */
2402 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2403 transport = list_entry(pos, struct sctp_transport, transports);
add52379
VY		 2404 if (transport->state != SCTP_ACTIVE)
2405 sctp_assoc_rm_peer(asoc, transport);
1da177e4 2406 }
3f7a87d2 2407
1da177e4
LT		 2408nomem:
2409 return 0;
2410}
2411
2412
2413/* Update asoc with the option described in param.
2414 *
2415 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2416 *
2417 * asoc is the association to update.
2418 * param is the variable length parameter to use for update.
2419 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2420 * If the current packet is an INIT we want to minimize the amount of
2421 * work we do. In particular, we should not build transport
2422 * structures for the addresses.
2423 */
2424static int sctp_process_param(struct sctp_association *asoc,
2425 union sctp_params param,
2426 const union sctp_addr *peer_addr,
dd0fc66f 2427 gfp_t gfp)
1da177e4
LT		 2428{
2429 union sctp_addr addr;
2430 int i;
2431 __u16 sat;
2432 int retval = 1;
2433 sctp_scope_t scope;
2434 time_t stale;
2435 struct sctp_af *af;
d6de3097
VY		 2436 union sctp_addr_param *addr_param;
2437 struct sctp_transport *t;
1da177e4
LT		 2438
2439 /* We maintain all INIT parameters in network byte order all the
2440 * time. This allows us to not worry about whether the parameters
2441 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2442 */
2443 switch (param.p->type) {
2444 case SCTP_PARAM_IPV6_ADDRESS:
2445 if (PF_INET6 != asoc->base.sk->sk_family)
2446 break;
7dab83de
VY		 2447 goto do_addr_param;
2448
1da177e4 2449 case SCTP_PARAM_IPV4_ADDRESS:
7dab83de
VY		 2450 /* v4 addresses are not allowed on v6-only socket */
2451 if (ipv6_only_sock(asoc->base.sk))
2452 break;
2453do_addr_param:
1da177e4 2454 af = sctp_get_af_specific(param_type2af(param.p->type));
dd86d136 2455 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
1da177e4 2456 scope = sctp_scope(peer_addr);
dd86d136
AV		 2457 if (sctp_in_scope(&addr, scope))
2458 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2459 return 0;
2460 break;
2461
2462 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2463 if (!sctp_cookie_preserve_enable)
2464 break;
2465
2466 stale = ntohl(param.life->lifespan_increment);
2467
2468 /* Suggested Cookie Life span increment's unit is msec,
2469 * (1/1000sec).
2470 */
2471 asoc->cookie_life.tv_sec += stale / 1000;
2472 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2473 break;
2474
2475 case SCTP_PARAM_HOST_NAME_ADDRESS:
2476 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2477 break;
2478
2479 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2480 /* Turn off the default values first so we'll know which
2481 * ones are really set by the peer.
2482 */
2483 asoc->peer.ipv4_address = 0;
2484 asoc->peer.ipv6_address = 0;
2485
140ee960
GJ		 2486 /* Assume that peer supports the address family
2487 * by which it sends a packet.
2488 */
2489 if (peer_addr->sa.sa_family == AF_INET6)
2490 asoc->peer.ipv6_address = 1;
2491 else if (peer_addr->sa.sa_family == AF_INET)
2492 asoc->peer.ipv4_address = 1;
2493
1da177e4
LT		 2494 /* Cycle through address types; avoid divide by 0. */
2495 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2496 if (sat)
2497 sat /= sizeof(__u16);
2498
2499 for (i = 0; i < sat; ++i) {
2500 switch (param.sat->types[i]) {
2501 case SCTP_PARAM_IPV4_ADDRESS:
2502 asoc->peer.ipv4_address = 1;
2503 break;
2504
2505 case SCTP_PARAM_IPV6_ADDRESS:
6e40a915
WY		 2506 if (PF_INET6 == asoc->base.sk->sk_family)
2507 asoc->peer.ipv6_address = 1;
1da177e4
LT		 2508 break;
2509
2510 case SCTP_PARAM_HOST_NAME_ADDRESS:
2511 asoc->peer.hostname_address = 1;
2512 break;
2513
2514 default: /* Just ignore anything else. */
2515 break;
3ff50b79 2516 }
1da177e4
LT		 2517 }
2518 break;
2519
2520 case SCTP_PARAM_STATE_COOKIE:
2521 asoc->peer.cookie_len =
2522 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2523 asoc->peer.cookie = param.cookie->body;
2524 break;
2525
2526 case SCTP_PARAM_HEARTBEAT_INFO:
2527 /* Would be odd to receive, but it causes no problems. */
2528 break;
2529
2530 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2531 /* Rejected during verify stage. */
2532 break;
2533
2534 case SCTP_PARAM_ECN_CAPABLE:
2535 asoc->peer.ecn_capable = 1;
2536 break;
2537
0f3fffd8 2538 case SCTP_PARAM_ADAPTATION_LAYER_IND:
e69c4e0f 2539 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
1da177e4
LT		 2540 break;
2541
d6de3097 2542 case SCTP_PARAM_SET_PRIMARY:
0ef46e28
VY		 2543 if (!sctp_addip_enable)
2544 goto fall_through;
2545
d6de3097
VY		 2546 addr_param = param.v + sizeof(sctp_addip_param_t);
2547
2548 af = sctp_get_af_specific(param_type2af(param.p->type));
2549 af->from_addr_param(&addr, addr_param,
2550 htons(asoc->peer.port), 0);
2551
2552 /* if the address is invalid, we can't process it.
2553 * XXX: see spec for what to do.
2554 */
2555 if (!af->addr_valid(&addr, NULL, NULL))
2556 break;
2557
2558 t = sctp_assoc_lookup_paddr(asoc, &addr);
2559 if (!t)
2560 break;
2561
2562 sctp_assoc_set_primary(asoc, t);
2563 break;
2564
131a47e3
VY		 2565 case SCTP_PARAM_SUPPORTED_EXT:
2566 sctp_process_ext_param(asoc, param);
2567 break;
2568
1da177e4
LT		 2569 case SCTP_PARAM_FWD_TSN_SUPPORT:
2570 if (sctp_prsctp_enable) {
2571 asoc->peer.prsctp_capable = 1;
2572 break;
2573 }
d808ad9a 2574 /* Fall Through */
730fc3d0
VY		 2575 goto fall_through;
2576
2577 case SCTP_PARAM_RANDOM:
2578 if (!sctp_auth_enable)
2579 goto fall_through;
2580
2581 /* Save peer's random parameter */
2582 asoc->peer.peer_random = kmemdup(param.p,
2583 ntohs(param.p->length), gfp);
2584 if (!asoc->peer.peer_random) {
2585 retval = 0;
2586 break;
2587 }
2588 break;
2589
2590 case SCTP_PARAM_HMAC_ALGO:
2591 if (!sctp_auth_enable)
2592 goto fall_through;
2593
2594 /* Save peer's HMAC list */
2595 asoc->peer.peer_hmacs = kmemdup(param.p,
2596 ntohs(param.p->length), gfp);
2597 if (!asoc->peer.peer_hmacs) {
2598 retval = 0;
2599 break;
2600 }
2601
2602 /* Set the default HMAC the peer requested*/
2603 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2604 break;
2605
2606 case SCTP_PARAM_CHUNKS:
2607 if (!sctp_auth_enable)
2608 goto fall_through;
2609
2610 asoc->peer.peer_chunks = kmemdup(param.p,
2611 ntohs(param.p->length), gfp);
2612 if (!asoc->peer.peer_chunks)
2613 retval = 0;
2614 break;
2615fall_through:
1da177e4
LT		 2616 default:
2617 /* Any unrecognized parameters should have been caught
2618 * and handled by sctp_verify_param() which should be
2619 * called prior to this routine. Simply log the error
2620 * here.
2621 */
2622 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2623 ntohs(param.p->type), asoc);
2624 break;
3ff50b79 2625 }
1da177e4
LT		 2626
2627 return retval;
2628}
2629
2630/* Select a new verification tag. */
2631__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2632{
2633 /* I believe that this random number generator complies with RFC1750.
2634 * A tag of 0 is reserved for special cases (e.g. INIT).
2635 */
2636 __u32 x;
2637
2638 do {
2639 get_random_bytes(&x, sizeof(__u32));
2640 } while (x == 0);
2641
2642 return x;
2643}
2644
2645/* Select an initial TSN to send during startup. */
2646__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2647{
2648 __u32 retval;
2649
2650 get_random_bytes(&retval, sizeof(__u32));
2651 return retval;
2652}
2653
2654/*
2655 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2656 * 0 1 2 3
2657 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2659 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2661 * | Serial Number |
2662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2663 * | Address Parameter |
2664 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2665 * | ASCONF Parameter #1 |
2666 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2667 * \ \
2668 * / .... /
2669 * \ \
2670 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2671 * | ASCONF Parameter #N |
2672 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2673 *
d808ad9a 2674 * Address Parameter and other parameter will not be wrapped in this function
1da177e4
LT		 2675 */
2676static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2677 union sctp_addr *addr,
2678 int vparam_len)
2679{
2680 sctp_addiphdr_t asconf;
2681 struct sctp_chunk *retval;
2682 int length = sizeof(asconf) + vparam_len;
2683 union sctp_addr_param addrparam;
2684 int addrlen;
2685 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2686
2687 addrlen = af->to_addr_param(addr, &addrparam);
2688 if (!addrlen)
2689 return NULL;
2690 length += addrlen;
2691
2692 /* Create the chunk. */
2693 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2694 if (!retval)
2695 return NULL;
2696
2697 asconf.serial = htonl(asoc->addip_serial++);
2698
2699 retval->subh.addip_hdr =
2700 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2701 retval->param_hdr.v =
2702 sctp_addto_chunk(retval, addrlen, &addrparam);
2703
2704 return retval;
2705}
2706
2707/* ADDIP
2708 * 3.2.1 Add IP Address
2709 * 0 1 2 3
2710 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2711 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2712 * | Type = 0xC001 | Length = Variable |
2713 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2714 * | ASCONF-Request Correlation ID |
2715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2716 * | Address Parameter |
2717 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2718 *
2719 * 3.2.2 Delete IP Address
2720 * 0 1 2 3
2721 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2723 * | Type = 0xC002 | Length = Variable |
2724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2725 * | ASCONF-Request Correlation ID |
2726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2727 * | Address Parameter |
2728 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2729 *
2730 */
2731struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2732 union sctp_addr *laddr,
2733 struct sockaddr *addrs,
2734 int addrcnt,
dbc16db1 2735 __be16 flags)
1da177e4
LT		 2736{
2737 sctp_addip_param_t param;
2738 struct sctp_chunk *retval;
2739 union sctp_addr_param addr_param;
2740 union sctp_addr *addr;
2741 void *addr_buf;
2742 struct sctp_af *af;
2743 int paramlen = sizeof(param);
2744 int addr_param_len = 0;
2745 int totallen = 0;
2746 int i;
2747
2748 /* Get total length of all the address parameters. */
2749 addr_buf = addrs;
2750 for (i = 0; i < addrcnt; i++) {
2751 addr = (union sctp_addr *)addr_buf;
2752 af = sctp_get_af_specific(addr->v4.sin_family);
2753 addr_param_len = af->to_addr_param(addr, &addr_param);
2754
2755 totallen += paramlen;
2756 totallen += addr_param_len;
2757
2758 addr_buf += af->sockaddr_len;
2759 }
2760
2761 /* Create an asconf chunk with the required length. */
2762 retval = sctp_make_asconf(asoc, laddr, totallen);
2763 if (!retval)
2764 return NULL;
2765
2766 /* Add the address parameters to the asconf chunk. */
2767 addr_buf = addrs;
2768 for (i = 0; i < addrcnt; i++) {
2769 addr = (union sctp_addr *)addr_buf;
2770 af = sctp_get_af_specific(addr->v4.sin_family);
2771 addr_param_len = af->to_addr_param(addr, &addr_param);
2772 param.param_hdr.type = flags;
2773 param.param_hdr.length = htons(paramlen + addr_param_len);
2774 param.crr_id = i;
2775
2776 sctp_addto_chunk(retval, paramlen, &param);
2777 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2778
2779 addr_buf += af->sockaddr_len;
2780 }
2781 return retval;
2782}
2783
2784/* ADDIP
2785 * 3.2.4 Set Primary IP Address
2786 * 0 1 2 3
2787 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2788 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * | Type =0xC004 | Length = Variable |
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | ASCONF-Request Correlation ID |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 * | Address Parameter |
2794 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 *
d808ad9a 2796 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2797 */
2798struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2799 union sctp_addr *addr)
2800{
2801 sctp_addip_param_t param;
2802 struct sctp_chunk *retval;
2803 int len = sizeof(param);
2804 union sctp_addr_param addrparam;
2805 int addrlen;
2806 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2807
2808 addrlen = af->to_addr_param(addr, &addrparam);
2809 if (!addrlen)
2810 return NULL;
2811 len += addrlen;
2812
2813 /* Create the chunk and make asconf header. */
2814 retval = sctp_make_asconf(asoc, addr, len);
2815 if (!retval)
2816 return NULL;
2817
2818 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2819 param.param_hdr.length = htons(len);
2820 param.crr_id = 0;
2821
2822 sctp_addto_chunk(retval, sizeof(param), &param);
2823 sctp_addto_chunk(retval, addrlen, &addrparam);
2824
2825 return retval;
2826}
2827
2828/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2829 * 0 1 2 3
2830 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2831 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2832 * | Type = 0x80 | Chunk Flags | Chunk Length |
2833 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2834 * | Serial Number |
2835 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2836 * | ASCONF Parameter Response#1 |
2837 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2838 * \ \
2839 * / .... /
2840 * \ \
2841 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2842 * | ASCONF Parameter Response#N |
2843 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2844 *
d808ad9a 2845 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2846 */
2847static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2848 __u32 serial, int vparam_len)
2849{
2850 sctp_addiphdr_t asconf;
2851 struct sctp_chunk *retval;
2852 int length = sizeof(asconf) + vparam_len;
2853
2854 /* Create the chunk. */
2855 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2856 if (!retval)
2857 return NULL;
2858
2859 asconf.serial = htonl(serial);
2860
2861 retval->subh.addip_hdr =
2862 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2863
2864 return retval;
2865}
2866
2867/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2868static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2869 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2870{
2871 sctp_addip_param_t ack_param;
2872 sctp_errhdr_t err_param;
2873 int asconf_param_len = 0;
2874 int err_param_len = 0;
dbc16db1 2875 __be16 response_type;
1da177e4
LT		 2876
2877 if (SCTP_ERROR_NO_ERROR == err_code) {
2878 response_type = SCTP_PARAM_SUCCESS_REPORT;
2879 } else {
2880 response_type = SCTP_PARAM_ERR_CAUSE;
2881 err_param_len = sizeof(err_param);
2882 if (asconf_param)
2883 asconf_param_len =
2884 ntohs(asconf_param->param_hdr.length);
2885 }
2886
d808ad9a 2887 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2888 ack_param.param_hdr.type = response_type;
2889 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2890 err_param_len +
2891 asconf_param_len);
2892 ack_param.crr_id = crr_id;
2893 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2894
2895 if (SCTP_ERROR_NO_ERROR == err_code)
2896 return;
2897
2898 /* Add Error Cause parameter. */
2899 err_param.cause = err_code;
2900 err_param.length = htons(err_param_len + asconf_param_len);
2901 sctp_addto_chunk(chunk, err_param_len, &err_param);
2902
2903 /* Add the failed TLV copied from ASCONF chunk. */
2904 if (asconf_param)
2905 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2906}
2907
2908/* Process a asconf parameter. */
dbc16db1 2909static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2910 struct sctp_chunk *asconf,
2911 sctp_addip_param_t *asconf_param)
2912{
2913 struct sctp_transport *peer;
2914 struct sctp_af *af;
2915 union sctp_addr addr;
1da177e4 2916 union sctp_addr_param *addr_param;
5f242a13 2917
c1cc678a
PM		 2918 addr_param = (union sctp_addr_param *)
2919 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2920
44e65c1e
WY		 2921 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2922 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2923 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2924 return SCTP_ERROR_UNKNOWN_PARAM;
2925
c4492586
WY		 2926 switch (addr_param->v4.param_hdr.type) {
2927 case SCTP_PARAM_IPV6_ADDRESS:
2928 if (!asoc->peer.ipv6_address)
945e5abc 2929 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2930 break;
2931 case SCTP_PARAM_IPV4_ADDRESS:
2932 if (!asoc->peer.ipv4_address)
945e5abc 2933 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2934 break;
2935 default:
945e5abc 2936 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2937 }
2938
1da177e4
LT		 2939 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2940 if (unlikely(!af))
945e5abc 2941 return SCTP_ERROR_DNS_FAILED;
1da177e4 2942
dd86d136 2943 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
42e30bf3
VY		 2944
2945 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2946 * or multicast address.
2947 * (note: wildcard is permitted and requires special handling so
2948 * make sure we check for that)
2949 */
2950 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
945e5abc 2951 return SCTP_ERROR_DNS_FAILED;
42e30bf3 2952
1da177e4
LT		 2953 switch (asconf_param->param_hdr.type) {
2954 case SCTP_PARAM_ADD_IP:
42e30bf3
VY		 2955 /* Section 4.2.1:
2956 * If the address 0.0.0.0 or ::0 is provided, the source
2957 * address of the packet MUST be added.
2958 */
2959 if (af->is_any(&addr))
2960 memcpy(&addr, &asconf->source, sizeof(addr));
2961
1da177e4 2962 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 2963 * request and does not have the local resources to add this
2964 * new address to the association, it MUST return an Error
2965 * Cause TLV set to the new error code 'Operation Refused
2966 * Due to Resource Shortage'.
2967 */
1da177e4 2968
dd86d136 2969 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 2970 if (!peer)
2971 return SCTP_ERROR_RSRC_LOW;
2972
2973 /* Start the heartbeat timer. */
2974 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2975 sctp_transport_hold(peer);
2976 break;
2977 case SCTP_PARAM_DEL_IP:
2978 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 2979 * last remaining IP address of a peer endpoint, the receiver
2980 * MUST send an Error Cause TLV with the error cause set to the
2981 * new error code 'Request to Delete Last Remaining IP Address'.
2982 */
42e30bf3 2983 if (asoc->peer.transport_count == 1)
1da177e4
LT		 2984 return SCTP_ERROR_DEL_LAST_IP;
2985
2986 /* ADDIP 4.3 D8) If a request is received to delete an IP
2987 * address which is also the source address of the IP packet
2988 * which contained the ASCONF chunk, the receiver MUST reject
2989 * this request. To reject the request the receiver MUST send
2990 * an Error Cause TLV set to the new error code 'Request to
2991 * Delete Source IP Address'
2992 */
6a1e5f33 2993 if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
1da177e4
LT		 2994 return SCTP_ERROR_DEL_SRC_IP;
2995
42e30bf3
VY		 2996 /* Section 4.2.2
2997 * If the address 0.0.0.0 or ::0 is provided, all
2998 * addresses of the peer except the source address of the
2999 * packet MUST be deleted.
3000 */
3001 if (af->is_any(&addr)) {
3002 sctp_assoc_set_primary(asoc, asconf->transport);
3003 sctp_assoc_del_nonprimary_peers(asoc,
3004 asconf->transport);
3005 } else
3006 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 3007 break;
3008 case SCTP_PARAM_SET_PRIMARY:
42e30bf3
VY		 3009 /* ADDIP Section 4.2.4
3010 * If the address 0.0.0.0 or ::0 is provided, the receiver
3011 * MAY mark the source address of the packet as its
3012 * primary.
3013 */
3014 if (af->is_any(&addr))
3015 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3016
dd86d136 3017 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4 3018 if (!peer)
945e5abc 3019 return SCTP_ERROR_DNS_FAILED;
1da177e4
LT		 3020
3021 sctp_assoc_set_primary(asoc, peer);
3022 break;
1da177e4
LT		 3023 }
3024
3025 return SCTP_ERROR_NO_ERROR;
3026}
3027
6f4c618d
WY		 3028/* Verify the ASCONF packet before we process it. */
3029int sctp_verify_asconf(const struct sctp_association *asoc,
3030 struct sctp_paramhdr *param_hdr, void *chunk_end,
3031 struct sctp_paramhdr **errp) {
3032 sctp_addip_param_t *asconf_param;
3033 union sctp_params param;
3034 int length, plen;
3035
3036 param.v = (sctp_paramhdr_t *) param_hdr;
3037 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3038 length = ntohs(param.p->length);
3039 *errp = param.p;
3040
3041 if (param.v > chunk_end - length ||
3042 length < sizeof(sctp_paramhdr_t))
3043 return 0;
3044
3045 switch (param.p->type) {
3046 case SCTP_PARAM_ADD_IP:
3047 case SCTP_PARAM_DEL_IP:
3048 case SCTP_PARAM_SET_PRIMARY:
3049 asconf_param = (sctp_addip_param_t *)param.v;
3050 plen = ntohs(asconf_param->param_hdr.length);
3051 if (plen < sizeof(sctp_addip_param_t) +
3052 sizeof(sctp_paramhdr_t))
3053 return 0;
3054 break;
3055 case SCTP_PARAM_SUCCESS_REPORT:
3056 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3057 if (length != sizeof(sctp_addip_param_t))
3058 return 0;
3059
3060 break;
3061 default:
3062 break;
3063 }
3064
3065 param.v += WORD_ROUND(length);
3066 }
3067
3068 if (param.v != chunk_end)
3069 return 0;
3070
3071 return 1;
3072}
3073
d808ad9a 3074/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 3075 * return an ASCONF_ACK chunk to be sent in response.
3076 */
3077struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3078 struct sctp_chunk *asconf)
3079{
3080 sctp_addiphdr_t *hdr;
3081 union sctp_addr_param *addr_param;
3082 sctp_addip_param_t *asconf_param;
3083 struct sctp_chunk *asconf_ack;
3084
dbc16db1 3085 __be16 err_code;
1da177e4 3086 int length = 0;
f3830ccc 3087 int chunk_len;
1da177e4
LT		 3088 __u32 serial;
3089 int all_param_pass = 1;
3090
f3830ccc 3091 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
1da177e4
LT		 3092 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3093 serial = ntohl(hdr->serial);
3094
d808ad9a 3095 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 3096 length = sizeof(sctp_addiphdr_t);
3097 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3098 chunk_len -= length;
3099
3100 /* Skip the address parameter and store a pointer to the first
7aa1b54b 3101 * asconf parameter.
d808ad9a 3102 */
1da177e4
LT		 3103 length = ntohs(addr_param->v4.param_hdr.length);
3104 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3105 chunk_len -= length;
3106
d808ad9a 3107 /* create an ASCONF_ACK chunk.
1da177e4
LT		 3108 * Based on the definitions of parameters, we know that the size of
3109 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
7aa1b54b 3110 * parameters.
1da177e4
LT		 3111 */
3112 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
3113 if (!asconf_ack)
3114 goto done;
3115
3116 /* Process the TLVs contained within the ASCONF chunk. */
3117 while (chunk_len > 0) {
3118 err_code = sctp_process_asconf_param(asoc, asconf,
3119 asconf_param);
3120 /* ADDIP 4.1 A7)
3121 * If an error response is received for a TLV parameter,
3122 * all TLVs with no response before the failed TLV are
3123 * considered successful if not reported. All TLVs after
3124 * the failed response are considered unsuccessful unless
3125 * a specific success indication is present for the parameter.
3126 */
3127 if (SCTP_ERROR_NO_ERROR != err_code)
3128 all_param_pass = 0;
3129
3130 if (!all_param_pass)
3131 sctp_add_asconf_response(asconf_ack,
3132 asconf_param->crr_id, err_code,
3133 asconf_param);
3134
3135 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3136 * an IP address sends an 'Out of Resource' in its response, it
3137 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 3138 * in the ASCONF.
1da177e4
LT		 3139 */
3140 if (SCTP_ERROR_RSRC_LOW == err_code)
3141 goto done;
3142
3143 /* Move to the next ASCONF param. */
3144 length = ntohs(asconf_param->param_hdr.length);
3145 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3146 length);
3147 chunk_len -= length;
3148 }
d808ad9a 3149
1da177e4
LT		 3150done:
3151 asoc->peer.addip_serial++;
3152
3153 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 3154 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 3155 */
3156 if (asconf_ack) {
1da177e4 3157 sctp_chunk_hold(asconf_ack);
a08de64d
VY		 3158 list_add_tail(&asconf_ack->transmitted_list,
3159 &asoc->asconf_ack_list);
1da177e4
LT		 3160 }
3161
3162 return asconf_ack;
3163}
3164
3165/* Process a asconf parameter that is successfully acked. */
425e0f68 3166static void sctp_asconf_param_success(struct sctp_association *asoc,
1da177e4
LT		 3167 sctp_addip_param_t *asconf_param)
3168{
3169 struct sctp_af *af;
3170 union sctp_addr addr;
3171 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3172 union sctp_addr_param *addr_param;
1da177e4 3173 struct sctp_transport *transport;
dc022a98 3174 struct sctp_sockaddr_entry *saddr;
1da177e4
LT		 3175
3176 addr_param = (union sctp_addr_param *)
3177 ((void *)asconf_param + sizeof(sctp_addip_param_t));
3178
3179 /* We have checked the packet before, so we do not check again. */
3180 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
dd86d136 3181 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 3182
3183 switch (asconf_param->param_hdr.type) {
3184 case SCTP_PARAM_ADD_IP:
559cf710
VY		 3185 /* This is always done in BH context with a socket lock
3186 * held, so the list can not change.
3187 */
0ed90fb0 3188 local_bh_disable();
559cf710 3189 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 3190 if (sctp_cmp_addr_exact(&saddr->a, &addr))
f57d96b2 3191 saddr->state = SCTP_ADDR_SRC;
dc022a98 3192 }
0ed90fb0 3193 local_bh_enable();
3cd9749c
WY		 3194 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3195 transports) {
3196 if (transport->state == SCTP_ACTIVE)
3197 continue;
3198 dst_release(transport->dst);
3199 sctp_transport_route(transport, NULL,
3200 sctp_sk(asoc->base.sk));
3201 }
1da177e4
LT		 3202 break;
3203 case SCTP_PARAM_DEL_IP:
0ed90fb0 3204 local_bh_disable();
425e0f68 3205 sctp_del_bind_addr(bp, &addr);
0ed90fb0 3206 local_bh_enable();
9dbc15f0
RD		 3207 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3208 transports) {
dc022a98 3209 dst_release(transport->dst);
1da177e4
LT		 3210 sctp_transport_route(transport, NULL,
3211 sctp_sk(asoc->base.sk));
3212 }
3213 break;
3214 default:
3215 break;
3216 }
1da177e4
LT		 3217}
3218
3219/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3220 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 3221 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 3222 * ADDIP 4.1
3223 * A7) If an error response is received for a TLV parameter, all TLVs with no
3224 * response before the failed TLV are considered successful if not reported.
3225 * All TLVs after the failed response are considered unsuccessful unless a
3226 * specific success indication is present for the parameter.
3227 */
dbc16db1 3228static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 3229 sctp_addip_param_t *asconf_param,
3230 int no_err)
3231{
3232 sctp_addip_param_t *asconf_ack_param;
3233 sctp_errhdr_t *err_param;
3234 int length;
f3830ccc 3235 int asconf_ack_len;
dbc16db1 3236 __be16 err_code;
1da177e4
LT		 3237
3238 if (no_err)
3239 err_code = SCTP_ERROR_NO_ERROR;
3240 else
3241 err_code = SCTP_ERROR_REQ_REFUSED;
3242
f3830ccc
WY		 3243 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3244 sizeof(sctp_chunkhdr_t);
3245
1da177e4
LT		 3246 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3247 * the first asconf_ack parameter.
d808ad9a 3248 */
1da177e4
LT		 3249 length = sizeof(sctp_addiphdr_t);
3250 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3251 length);
3252 asconf_ack_len -= length;
3253
3254 while (asconf_ack_len > 0) {
3255 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3256 switch(asconf_ack_param->param_hdr.type) {
3257 case SCTP_PARAM_SUCCESS_REPORT:
3258 return SCTP_ERROR_NO_ERROR;
3259 case SCTP_PARAM_ERR_CAUSE:
3260 length = sizeof(sctp_addip_param_t);
3261 err_param = (sctp_errhdr_t *)
3262 ((void *)asconf_ack_param + length);
3263 asconf_ack_len -= length;
3264 if (asconf_ack_len > 0)
3265 return err_param->cause;
3266 else
3267 return SCTP_ERROR_INV_PARAM;
3268 break;
3269 default:
3270 return SCTP_ERROR_INV_PARAM;
3271 }
3272 }
3273
3274 length = ntohs(asconf_ack_param->param_hdr.length);
3275 asconf_ack_param = (sctp_addip_param_t *)
3276 ((void *)asconf_ack_param + length);
3277 asconf_ack_len -= length;
3278 }
3279
3280 return err_code;
3281}
3282
3283/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3284int sctp_process_asconf_ack(struct sctp_association *asoc,
3285 struct sctp_chunk *asconf_ack)
3286{
3287 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3288 union sctp_addr_param *addr_param;
3289 sctp_addip_param_t *asconf_param;
3290 int length = 0;
3291 int asconf_len = asconf->skb->len;
3292 int all_param_pass = 0;
3293 int no_err = 1;
3294 int retval = 0;
dbc16db1 3295 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3296
3297 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3298 * a pointer to address parameter.
d808ad9a 3299 */
1da177e4
LT		 3300 length = sizeof(sctp_addip_chunk_t);
3301 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3302 asconf_len -= length;
3303
3304 /* Skip the address parameter in the last asconf sent and store a
7aa1b54b 3305 * pointer to the first asconf parameter.
d808ad9a 3306 */
1da177e4
LT		 3307 length = ntohs(addr_param->v4.param_hdr.length);
3308 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3309 asconf_len -= length;
3310
3311 /* ADDIP 4.1
3312 * A8) If there is no response(s) to specific TLV parameter(s), and no
3313 * failures are indicated, then all request(s) are considered
3314 * successful.
3315 */
3316 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3317 all_param_pass = 1;
3318
3319 /* Process the TLVs contained in the last sent ASCONF chunk. */
3320 while (asconf_len > 0) {
3321 if (all_param_pass)
3322 err_code = SCTP_ERROR_NO_ERROR;
3323 else {
3324 err_code = sctp_get_asconf_response(asconf_ack,
3325 asconf_param,
3326 no_err);
3327 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3328 no_err = 0;
3329 }
3330
3331 switch (err_code) {
3332 case SCTP_ERROR_NO_ERROR:
425e0f68 3333 sctp_asconf_param_success(asoc, asconf_param);
1da177e4
LT		 3334 break;
3335
3336 case SCTP_ERROR_RSRC_LOW:
3337 retval = 1;
3338 break;
3339
a987f762 3340 case SCTP_ERROR_UNKNOWN_PARAM:
1da177e4
LT		 3341 /* Disable sending this type of asconf parameter in
3342 * future.
d808ad9a 3343 */
1da177e4
LT		 3344 asoc->peer.addip_disabled_mask |=
3345 asconf_param->param_hdr.type;
3346 break;
3347
3348 case SCTP_ERROR_REQ_REFUSED:
3349 case SCTP_ERROR_DEL_LAST_IP:
3350 case SCTP_ERROR_DEL_SRC_IP:
3351 default:
3352 break;
3353 }
3354
3355 /* Skip the processed asconf parameter and move to the next
3356 * one.
d808ad9a 3357 */
1da177e4
LT		 3358 length = ntohs(asconf_param->param_hdr.length);
3359 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3360 length);
3361 asconf_len -= length;
3362 }
3363
3364 /* Free the cached last sent asconf chunk. */
5f9646c3 3365 list_del_init(&asconf->transmitted_list);
1da177e4
LT		 3366 sctp_chunk_free(asconf);
3367 asoc->addip_last_asconf = NULL;
3368
1da177e4
LT		 3369 return retval;
3370}
3371
d808ad9a 3372/* Make a FWD TSN chunk. */
1da177e4
LT		 3373struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3374 __u32 new_cum_tsn, size_t nstreams,
3375 struct sctp_fwdtsn_skip *skiplist)
3376{
3377 struct sctp_chunk *retval = NULL;
3378 struct sctp_fwdtsn_chunk *ftsn_chunk;
d808ad9a 3379 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3380 struct sctp_fwdtsn_skip skip;
3381 size_t hint;
3382 int i;
3383
3384 hint = (nstreams + 1) * sizeof(__u32);
3385
1da177e4
LT		 3386 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3387
3388 if (!retval)
3389 return NULL;
3390
3391 ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr;
3392
3393 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3394 retval->subh.fwdtsn_hdr =
3395 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3396
3397 for (i = 0; i < nstreams; i++) {
3398 skip.stream = skiplist[i].stream;
3399 skip.ssn = skiplist[i].ssn;
3400 sctp_addto_chunk(retval, sizeof(skip), &skip);
3401 }
3402
3403 return retval;
3404}
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