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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sctp / sm_make_chunk.c
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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;
4244854d 737 struct sctp_association *aptr = (struct sctp_association *)asoc;
1da177e4 738 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
02015180 739 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
4244854d 740 struct sctp_transport *trans;
1da177e4 741
02015180 742 memset(gabs, 0, sizeof(gabs));
1da177e4
LT		 743 ctsn = sctp_tsnmap_get_ctsn(map);
744 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
745
746 /* How much room is needed in the chunk? */
02015180 747 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
1da177e4
LT		 748 num_dup_tsns = sctp_tsnmap_num_dups(map);
749
750 /* Initialize the SACK header. */
751 sack.cum_tsn_ack = htonl(ctsn);
752 sack.a_rwnd = htonl(asoc->a_rwnd);
753 sack.num_gap_ack_blocks = htons(num_gabs);
754 sack.num_dup_tsns = htons(num_dup_tsns);
755
756 len = sizeof(sack)
757 + sizeof(struct sctp_gap_ack_block) * num_gabs
758 + sizeof(__u32) * num_dup_tsns;
759
760 /* Create the chunk. */
761 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
762 if (!retval)
763 goto nodata;
764
765 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
766 *
767 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
768 * HEARTBEAT ACK, etc.) to the same destination transport
769 * address from which it received the DATA or control chunk to
770 * which it is replying. This rule should also be followed if
771 * the endpoint is bundling DATA chunks together with the
772 * reply chunk.
773 *
774 * However, when acknowledging multiple DATA chunks received
775 * in packets from different source addresses in a single
776 * SACK, the SACK chunk may be transmitted to one of the
777 * destination transport addresses from which the DATA or
778 * control chunks being acknowledged were received.
779 *
780 * [BUG: We do not implement the following paragraph.
781 * Perhaps we should remember the last transport we used for a
782 * SACK and avoid that (if possible) if we have seen any
783 * duplicates. --piggy]
784 *
785 * When a receiver of a duplicate DATA chunk sends a SACK to a
786 * multi- homed endpoint it MAY be beneficial to vary the
787 * destination address and not use the source address of the
788 * DATA chunk. The reason being that receiving a duplicate
789 * from a multi-homed endpoint might indicate that the return
790 * path (as specified in the source address of the DATA chunk)
791 * for the SACK is broken.
792 *
793 * [Send to the address from which we last received a DATA chunk.]
794 */
795 retval->transport = asoc->peer.last_data_from;
796
797 retval->subh.sack_hdr =
798 sctp_addto_chunk(retval, sizeof(sack), &sack);
799
800 /* Add the gap ack block information. */
801 if (num_gabs)
802 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
02015180 803 gabs);
1da177e4
LT		 804
805 /* Add the duplicate TSN information. */
806 if (num_dup_tsns)
807 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
808 sctp_tsnmap_get_dups(map));
809
4244854d
NH		 810 /* Once we have a sack generated, check to see what our sack
811 * generation is, if its 0, reset the transports to 0, and reset
812 * the association generation to 1
813 *
814 * The idea is that zero is never used as a valid generation for the
815 * association so no transport will match after a wrap event like this,
816 * Until the next sack
817 */
818 if (++aptr->peer.sack_generation == 0) {
819 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
820 transports)
821 trans->sack_generation = 0;
822 aptr->peer.sack_generation = 1;
823 }
1da177e4
LT		 824nodata:
825 return retval;
826}
827
828/* Make a SHUTDOWN chunk. */
829struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
830 const struct sctp_chunk *chunk)
831{
832 struct sctp_chunk *retval;
833 sctp_shutdownhdr_t shut;
834 __u32 ctsn;
835
836 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
837 shut.cum_tsn_ack = htonl(ctsn);
838
839 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
840 sizeof(sctp_shutdownhdr_t));
841 if (!retval)
842 goto nodata;
843
844 retval->subh.shutdown_hdr =
845 sctp_addto_chunk(retval, sizeof(shut), &shut);
846
847 if (chunk)
848 retval->transport = chunk->transport;
849nodata:
850 return retval;
851}
852
853struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
854 const struct sctp_chunk *chunk)
855{
856 struct sctp_chunk *retval;
857
858 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
859
860 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
861 *
862 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
863 * HEARTBEAT ACK, * etc.) to the same destination transport
864 * address from which it * received the DATA or control chunk
865 * to which it is replying.
866 *
867 * [ACK back to where the SHUTDOWN came from.]
868 */
869 if (retval && chunk)
870 retval->transport = chunk->transport;
871
872 return retval;
873}
874
875struct sctp_chunk *sctp_make_shutdown_complete(
876 const struct sctp_association *asoc,
877 const struct sctp_chunk *chunk)
878{
879 struct sctp_chunk *retval;
880 __u8 flags = 0;
881
047a2428
JF		 882 /* Set the T-bit if we have no association (vtag will be
883 * reflected)
884 */
1da177e4
LT		 885 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
886
887 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
888
889 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
890 *
891 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
892 * HEARTBEAT ACK, * etc.) to the same destination transport
893 * address from which it * received the DATA or control chunk
894 * to which it is replying.
895 *
896 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
897 * came from.]
898 */
899 if (retval && chunk)
900 retval->transport = chunk->transport;
901
d808ad9a 902 return retval;
1da177e4
LT		 903}
904
905/* Create an ABORT. Note that we set the T bit if we have no
047a2428 906 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 907 */
908struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
909 const struct sctp_chunk *chunk,
910 const size_t hint)
911{
912 struct sctp_chunk *retval;
913 __u8 flags = 0;
914
047a2428
JF		 915 /* Set the T-bit if we have no association and 'chunk' is not
916 * an INIT (vtag will be reflected).
917 */
918 if (!asoc) {
919 if (chunk && chunk->chunk_hdr &&
920 chunk->chunk_hdr->type == SCTP_CID_INIT)
921 flags = 0;
922 else
923 flags = SCTP_CHUNK_FLAG_T;
924 }
1da177e4
LT		 925
926 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
927
928 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
929 *
930 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
931 * HEARTBEAT ACK, * etc.) to the same destination transport
932 * address from which it * received the DATA or control chunk
933 * to which it is replying.
934 *
935 * [ABORT back to where the offender came from.]
936 */
937 if (retval && chunk)
938 retval->transport = chunk->transport;
939
940 return retval;
941}
942
943/* Helper to create ABORT with a NO_USER_DATA error. */
944struct sctp_chunk *sctp_make_abort_no_data(
945 const struct sctp_association *asoc,
946 const struct sctp_chunk *chunk, __u32 tsn)
947{
948 struct sctp_chunk *retval;
9f81bcd9 949 __be32 payload;
1da177e4
LT		 950
951 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
952 + sizeof(tsn));
953
954 if (!retval)
955 goto no_mem;
956
957 /* Put the tsn back into network byte order. */
958 payload = htonl(tsn);
00f1c2df
WY		 959 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
960 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 961
962 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
963 *
964 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
965 * HEARTBEAT ACK, * etc.) to the same destination transport
966 * address from which it * received the DATA or control chunk
967 * to which it is replying.
968 *
969 * [ABORT back to where the offender came from.]
970 */
971 if (chunk)
972 retval->transport = chunk->transport;
973
974no_mem:
975 return retval;
976}
977
978/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
979struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 980 const struct msghdr *msg,
981 size_t paylen)
1da177e4
LT		 982{
983 struct sctp_chunk *retval;
c164a9ba
SS		 984 void *payload = NULL;
985 int err;
1da177e4 986
c164a9ba 987 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 988 if (!retval)
989 goto err_chunk;
990
991 if (paylen) {
992 /* Put the msg_iov together into payload. */
c164a9ba 993 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 994 if (!payload)
995 goto err_payload;
c164a9ba
SS		 996
997 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
998 if (err < 0)
999 goto err_copy;
1da177e4
LT		 1000 }
1001
00f1c2df
WY		 1002 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1003 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 1004
1005 if (paylen)
1006 kfree(payload);
1007
1008 return retval;
1009
1010err_copy:
1011 kfree(payload);
1012err_payload:
1013 sctp_chunk_free(retval);
1014 retval = NULL;
1015err_chunk:
1016 return retval;
1017}
1018
5c94bf86
AB		 1019/* Append bytes to the end of a parameter. Will panic if chunk is not big
1020 * enough.
1021 */
1022static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1023 const void *data)
1024{
1025 void *target;
1026 int chunklen = ntohs(chunk->chunk_hdr->length);
1027
1028 target = skb_put(chunk->skb, len);
1029
6383cfb3
VY		 1030 if (data)
1031 memcpy(target, data, len);
1032 else
1033 memset(target, 0, len);
5c94bf86
AB		 1034
1035 /* Adjust the chunk length field. */
1036 chunk->chunk_hdr->length = htons(chunklen + len);
1037 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1038
1039 return target;
1040}
1041
d808ad9a 1042/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 1043struct sctp_chunk *sctp_make_abort_violation(
1044 const struct sctp_association *asoc,
1045 const struct sctp_chunk *chunk,
1046 const __u8 *payload,
1047 const size_t paylen)
1048{
1049 struct sctp_chunk *retval;
1050 struct sctp_paramhdr phdr;
1051
1052 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1053 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1054 if (!retval)
1055 goto end;
1056
00f1c2df
WY		 1057 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1058 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1059
1060 phdr.type = htons(chunk->chunk_hdr->type);
1061 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1062 sctp_addto_chunk(retval, paylen, payload);
1063 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1064
1065end:
1066 return retval;
1067}
1068
ba016670
WY		 1069struct sctp_chunk *sctp_make_violation_paramlen(
1070 const struct sctp_association *asoc,
1071 const struct sctp_chunk *chunk,
1072 struct sctp_paramhdr *param)
1073{
1074 struct sctp_chunk *retval;
1075 static const char error[] = "The following parameter had invalid length:";
1076 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1077 sizeof(sctp_paramhdr_t);
1078
1079 retval = sctp_make_abort(asoc, chunk, payload_len);
1080 if (!retval)
1081 goto nodata;
1082
1083 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1084 sizeof(error) + sizeof(sctp_paramhdr_t));
1085 sctp_addto_chunk(retval, sizeof(error), error);
1086 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1087
1088nodata:
1089 return retval;
1090}
1091
1da177e4
LT		 1092/* Make a HEARTBEAT chunk. */
1093struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
92c73af5 1094 const struct sctp_transport *transport)
1da177e4 1095{
92c73af5
WY		 1096 struct sctp_chunk *retval;
1097 sctp_sender_hb_info_t hbinfo;
1098
1099 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
1da177e4
LT		 1100
1101 if (!retval)
1102 goto nodata;
1103
92c73af5
WY		 1104 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1105 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1106 hbinfo.daddr = transport->ipaddr;
1107 hbinfo.sent_at = jiffies;
1108 hbinfo.hb_nonce = transport->hb_nonce;
1109
1da177e4
LT		 1110 /* Cast away the 'const', as this is just telling the chunk
1111 * what transport it belongs to.
1112 */
1113 retval->transport = (struct sctp_transport *) transport;
92c73af5
WY		 1114 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1115 &hbinfo);
1da177e4
LT		 1116
1117nodata:
1118 return retval;
1119}
1120
1121struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1122 const struct sctp_chunk *chunk,
1123 const void *payload, const size_t paylen)
1124{
1125 struct sctp_chunk *retval;
1126
1127 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1128 if (!retval)
1129 goto nodata;
1130
1131 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1132
1133 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1134 *
1135 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1136 * HEARTBEAT ACK, * etc.) to the same destination transport
1137 * address from which it * received the DATA or control chunk
1138 * to which it is replying.
1139 *
1140 * [HBACK back to where the HEARTBEAT came from.]
1141 */
1142 if (chunk)
1143 retval->transport = chunk->transport;
1144
1145nodata:
1146 return retval;
1147}
1148
1149/* Create an Operation Error chunk with the specified space reserved.
1150 * This routine can be used for containing multiple causes in the chunk.
1151 */
1152static struct sctp_chunk *sctp_make_op_error_space(
1153 const struct sctp_association *asoc,
1154 const struct sctp_chunk *chunk,
1155 size_t size)
1156{
1157 struct sctp_chunk *retval;
1158
1159 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1160 sizeof(sctp_errhdr_t) + size);
1161 if (!retval)
1162 goto nodata;
1163
1164 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1165 *
1166 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1167 * HEARTBEAT ACK, etc.) to the same destination transport
1168 * address from which it received the DATA or control chunk
1169 * to which it is replying.
1170 *
1171 */
1172 if (chunk)
1173 retval->transport = chunk->transport;
1174
1175nodata:
1176 return retval;
1177}
1178
5fa782c2
NH		 1179/* Create an Operation Error chunk of a fixed size,
1180 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1181 * This is a helper function to allocate an error chunk for
1182 * for those invalid parameter codes in which we may not want
1183 * to report all the errors, if the incomming chunk is large
1184 */
1185static inline struct sctp_chunk *sctp_make_op_error_fixed(
1186 const struct sctp_association *asoc,
1187 const struct sctp_chunk *chunk)
1188{
1189 size_t size = asoc ? asoc->pathmtu : 0;
1190
1191 if (!size)
1192 size = SCTP_DEFAULT_MAXSEGMENT;
1193
1194 return sctp_make_op_error_space(asoc, chunk, size);
1195}
1196
1da177e4
LT		 1197/* Create an Operation Error chunk. */
1198struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1199 const struct sctp_chunk *chunk,
63706c5c 1200 __be16 cause_code, const void *payload,
6383cfb3 1201 size_t paylen, size_t reserve_tail)
1da177e4
LT		 1202{
1203 struct sctp_chunk *retval;
1204
6383cfb3 1205 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1da177e4
LT		 1206 if (!retval)
1207 goto nodata;
1208
6383cfb3 1209 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
00f1c2df 1210 sctp_addto_chunk(retval, paylen, payload);
6383cfb3
VY		 1211 if (reserve_tail)
1212 sctp_addto_param(retval, reserve_tail, NULL);
1da177e4
LT		 1213
1214nodata:
1215 return retval;
1216}
1217
4cd57c80
VY		 1218struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1219{
1220 struct sctp_chunk *retval;
1221 struct sctp_hmac *hmac_desc;
1222 struct sctp_authhdr auth_hdr;
1223 __u8 *hmac;
1224
1225 /* Get the first hmac that the peer told us to use */
1226 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1227 if (unlikely(!hmac_desc))
1228 return NULL;
1229
1230 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1231 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1232 if (!retval)
1233 return NULL;
1234
1235 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1236 auth_hdr.shkey_id = htons(asoc->active_key_id);
1237
1238 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1239 &auth_hdr);
1240
1241 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1242 memset(hmac, 0, hmac_desc->hmac_len);
1243
1244 /* Adjust the chunk header to include the empty MAC */
1245 retval->chunk_hdr->length =
1246 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1247 retval->chunk_end = skb_tail_pointer(retval->skb);
1248
1249 return retval;
1250}
1251
1252
1da177e4
LT		 1253/********************************************************************
1254 * 2nd Level Abstractions
1255 ********************************************************************/
1256
1257/* Turn an skb into a chunk.
1258 * FIXME: Eventually move the structure directly inside the skb->cb[].
1259 */
1260struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1261 const struct sctp_association *asoc,
1262 struct sock *sk)
1263{
1264 struct sctp_chunk *retval;
1265
c3762229 1266 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1267
1268 if (!retval)
1269 goto nodata;
1da177e4
LT		 1270
1271 if (!sk) {
1272 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1273 }
1274
79af02c2 1275 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1276 retval->skb = skb;
1277 retval->asoc = (struct sctp_association *)asoc;
1da177e4
LT		 1278 retval->has_tsn = 0;
1279 retval->has_ssn = 0;
1280 retval->rtt_in_progress = 0;
1281 retval->sent_at = 0;
1282 retval->singleton = 1;
1283 retval->end_of_packet = 0;
1284 retval->ecn_ce_done = 0;
1285 retval->pdiscard = 0;
1286
1287 /* sctpimpguide-05.txt Section 2.8.2
1288 * M1) Each time a new DATA chunk is transmitted
1289 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1290 * 'TSN.Missing.Report' count will be used to determine missing chunks
1291 * and when to fast retransmit.
1292 */
1293 retval->tsn_missing_report = 0;
1294 retval->tsn_gap_acked = 0;
c226ef9b 1295 retval->fast_retransmit = SCTP_CAN_FRTX;
1da177e4
LT		 1296
1297 /* If this is a fragmented message, track all fragments
1298 * of the message (for SEND_FAILED).
1299 */
1300 retval->msg = NULL;
1301
1302 /* Polish the bead hole. */
1303 INIT_LIST_HEAD(&retval->transmitted_list);
1304 INIT_LIST_HEAD(&retval->frag_list);
1305 SCTP_DBG_OBJCNT_INC(chunk);
1306 atomic_set(&retval->refcnt, 1);
1307
1308nodata:
1309 return retval;
1310}
1311
1312/* Set chunk->source and dest based on the IP header in chunk->skb. */
1313void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1314 union sctp_addr *dest)
1315{
f235fca3 1316 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1317 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1318}
1319
1320/* Extract the source address from a chunk. */
1321const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1322{
1323 /* If we have a known transport, use that. */
1324 if (chunk->transport) {
6a1e5f33 1325 return &chunk->transport->ipaddr;
1da177e4
LT		 1326 } else {
1327 /* Otherwise, extract it from the IP header. */
6a1e5f33 1328 return &chunk->source;
1da177e4
LT		 1329 }
1330}
1331
1332/* Create a new chunk, setting the type and flags headers from the
1333 * arguments, reserving enough space for a 'paylen' byte payload.
1334 */
1335SCTP_STATIC
1336struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1337 __u8 type, __u8 flags, int paylen)
1338{
1339 struct sctp_chunk *retval;
1340 sctp_chunkhdr_t *chunk_hdr;
1341 struct sk_buff *skb;
1342 struct sock *sk;
1343
1344 /* No need to allocate LL here, as this is only a chunk. */
1345 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1346 GFP_ATOMIC);
1347 if (!skb)
1348 goto nodata;
1349
1350 /* Make room for the chunk header. */
1351 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1352 chunk_hdr->type = type;
1353 chunk_hdr->flags = flags;
1354 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1355
1356 sk = asoc ? asoc->base.sk : NULL;
1357 retval = sctp_chunkify(skb, asoc, sk);
1358 if (!retval) {
1359 kfree_skb(skb);
1360 goto nodata;
1361 }
1362
1363 retval->chunk_hdr = chunk_hdr;
1364 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1365
4cd57c80
VY		 1366 /* Determine if the chunk needs to be authenticated */
1367 if (sctp_auth_send_cid(type, asoc))
1368 retval->auth = 1;
1369
1da177e4
LT		 1370 /* Set the skb to the belonging sock for accounting. */
1371 skb->sk = sk;
1372
1373 return retval;
1374nodata:
1375 return NULL;
1376}
1377
1378
1379/* Release the memory occupied by a chunk. */
1380static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1381{
a08de64d
VY		 1382 BUG_ON(!list_empty(&chunk->list));
1383 list_del_init(&chunk->transmitted_list);
1384
1da177e4
LT		 1385 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1386 dev_kfree_skb(chunk->skb);
1387
1388 SCTP_DBG_OBJCNT_DEC(chunk);
1389 kmem_cache_free(sctp_chunk_cachep, chunk);
1390}
1391
1392/* Possibly, free the chunk. */
1393void sctp_chunk_free(struct sctp_chunk *chunk)
1394{
1da177e4
LT		 1395 /* Release our reference on the message tracker. */
1396 if (chunk->msg)
1397 sctp_datamsg_put(chunk->msg);
1398
1399 sctp_chunk_put(chunk);
1400}
1401
1402/* Grab a reference to the chunk. */
1403void sctp_chunk_hold(struct sctp_chunk *ch)
1404{
1405 atomic_inc(&ch->refcnt);
1406}
1407
1408/* Release a reference to the chunk. */
1409void sctp_chunk_put(struct sctp_chunk *ch)
1410{
1411 if (atomic_dec_and_test(&ch->refcnt))
1412 sctp_chunk_destroy(ch);
1413}
1414
1415/* Append bytes to the end of a chunk. Will panic if chunk is not big
1416 * enough.
1417 */
1418void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1419{
1420 void *target;
1421 void *padding;
1422 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1423 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1424
1425 padding = skb_put(chunk->skb, padlen);
1426 target = skb_put(chunk->skb, len);
1427
1428 memset(padding, 0, padlen);
1429 memcpy(target, data, len);
1430
1431 /* Adjust the chunk length field. */
1432 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1433 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1434
1435 return target;
1436}
1437
5fa782c2
NH		 1438/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1439 * space in the chunk
1440 */
1441void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1442 int len, const void *data)
1443{
2e3219b5 1444 if (skb_tailroom(chunk->skb) >= len)
5fa782c2
NH		 1445 return sctp_addto_chunk(chunk, len, data);
1446 else
1447 return NULL;
1448}
1449
1da177e4
LT		 1450/* Append bytes from user space to the end of a chunk. Will panic if
1451 * chunk is not big enough.
1452 * Returns a kernel err value.
1453 */
1454int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1455 struct iovec *data)
1456{
1457 __u8 *target;
1458 int err = 0;
1459
1460 /* Make room in chunk for data. */
1461 target = skb_put(chunk->skb, len);
1462
1463 /* Copy data (whole iovec) into chunk */
1464 if ((err = memcpy_fromiovecend(target, data, off, len)))
1465 goto out;
1466
1467 /* Adjust the chunk length field. */
1468 chunk->chunk_hdr->length =
1469 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1470 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1471
1472out:
1473 return err;
1474}
1475
1476/* Helper function to assign a TSN if needed. This assumes that both
1477 * the data_hdr and association have already been assigned.
1478 */
1479void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1480{
ab3e5e7b
VY		 1481 struct sctp_datamsg *msg;
1482 struct sctp_chunk *lchunk;
1483 struct sctp_stream *stream;
1da177e4
LT		 1484 __u16 ssn;
1485 __u16 sid;
1486
1487 if (chunk->has_ssn)
1488 return;
1489
ab3e5e7b
VY		 1490 /* All fragments will be on the same stream */
1491 sid = ntohs(chunk->subh.data_hdr->stream);
1492 stream = &chunk->asoc->ssnmap->out;
1da177e4 1493
ab3e5e7b
VY		 1494 /* Now assign the sequence number to the entire message.
1495 * All fragments must have the same stream sequence number.
1496 */
1497 msg = chunk->msg;
1498 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1499 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1500 ssn = 0;
1501 } else {
1502 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1503 ssn = sctp_ssn_next(stream, sid);
1504 else
1505 ssn = sctp_ssn_peek(stream, sid);
1506 }
1507
1508 lchunk->subh.data_hdr->ssn = htons(ssn);
1509 lchunk->has_ssn = 1;
1510 }
1da177e4
LT		 1511}
1512
1513/* Helper function to assign a TSN if needed. This assumes that both
1514 * the data_hdr and association have already been assigned.
1515 */
1516void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1517{
1518 if (!chunk->has_tsn) {
1519 /* This is the last possible instant to
1520 * assign a TSN.
1521 */
1522 chunk->subh.data_hdr->tsn =
1523 htonl(sctp_association_get_next_tsn(chunk->asoc));
1524 chunk->has_tsn = 1;
1525 }
1526}
1527
1528/* Create a CLOSED association to use with an incoming packet. */
1529struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1530 struct sctp_chunk *chunk,
dd0fc66f 1531 gfp_t gfp)
1da177e4
LT		 1532{
1533 struct sctp_association *asoc;
1534 struct sk_buff *skb;
1535 sctp_scope_t scope;
1536 struct sctp_af *af;
1537
1538 /* Create the bare association. */
1539 scope = sctp_scope(sctp_source(chunk));
1540 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1541 if (!asoc)
1542 goto nodata;
1543 asoc->temp = 1;
1544 skb = chunk->skb;
1545 /* Create an entry for the source address of the packet. */
eddc9ec5 1546 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1547 if (unlikely(!af))
1548 goto fail;
d55c41b1 1549 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1550nodata:
1551 return asoc;
1552
1553fail:
1554 sctp_association_free(asoc);
1555 return NULL;
1556}
1557
1558/* Build a cookie representing asoc.
1559 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1560 */
1561static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1562 const struct sctp_association *asoc,
1563 const struct sctp_chunk *init_chunk,
1564 int *cookie_len,
1565 const __u8 *raw_addrs, int addrs_len)
1566{
1567 sctp_cookie_param_t *retval;
1568 struct sctp_signed_cookie *cookie;
1569 struct scatterlist sg;
1570 int headersize, bodysize;
1571 unsigned int keylen;
1572 char *key;
1573
9834a2bb
VY		 1574 /* Header size is static data prior to the actual cookie, including
1575 * any padding.
1576 */
d808ad9a
YH		 1577 headersize = sizeof(sctp_paramhdr_t) +
1578 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1579 sizeof(struct sctp_cookie));
1da177e4
LT		 1580 bodysize = sizeof(struct sctp_cookie)
1581 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1582
1583 /* Pad out the cookie to a multiple to make the signature
1584 * functions simpler to write.
1585 */
1586 if (bodysize % SCTP_COOKIE_MULTIPLE)
1587 bodysize += SCTP_COOKIE_MULTIPLE
1588 - (bodysize % SCTP_COOKIE_MULTIPLE);
1589 *cookie_len = headersize + bodysize;
1590
1da177e4
LT		 1591 /* Clear this memory since we are sending this data structure
1592 * out on the network.
1593 */
af997d8c
ACM		 1594 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1595 if (!retval)
1596 goto nodata;
1597
1da177e4
LT		 1598 cookie = (struct sctp_signed_cookie *) retval->body;
1599
1600 /* Set up the parameter header. */
1601 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1602 retval->p.length = htons(*cookie_len);
1603
1604 /* Copy the cookie part of the association itself. */
1605 cookie->c = asoc->c;
1606 /* Save the raw address list length in the cookie. */
1607 cookie->c.raw_addr_list_len = addrs_len;
1608
1609 /* Remember PR-SCTP capability. */
1610 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1611
0f3fffd8
ISJ		 1612 /* Save adaptation indication in the cookie. */
1613 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1614
1615 /* Set an expiration time for the cookie. */
1616 do_gettimeofday(&cookie->c.expiration);
1617 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1618
1619 /* Copy the peer's init packet. */
1620 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1621 ntohs(init_chunk->chunk_hdr->length));
1622
1623 /* Copy the raw local address list of the association. */
1624 memcpy((__u8 *)&cookie->c.peer_init[0] +
1625 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1626
d808ad9a 1627 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1628 struct hash_desc desc;
1629
1da177e4 1630 /* Sign the message. */
68e3f5dd 1631 sg_init_one(&sg, &cookie->c, bodysize);
1da177e4
LT		 1632 keylen = SCTP_SECRET_SIZE;
1633 key = (char *)ep->secret_key[ep->current_key];
d808ad9a
YH		 1634 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1635 desc.flags = 0;
1da177e4 1636
1b489e11
HX		 1637 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1638 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1639 goto free_cookie;
1da177e4
LT		 1640 }
1641
1da177e4 1642 return retval;
1b489e11
HX		 1643
1644free_cookie:
1645 kfree(retval);
1646nodata:
1647 *cookie_len = 0;
1648 return NULL;
1da177e4
LT		 1649}
1650
1651/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1652struct sctp_association *sctp_unpack_cookie(
1653 const struct sctp_endpoint *ep,
1654 const struct sctp_association *asoc,
dd0fc66f 1655 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1656 int *error, struct sctp_chunk **errp)
1657{
1658 struct sctp_association *retval = NULL;
1659 struct sctp_signed_cookie *cookie;
1660 struct sctp_cookie *bear_cookie;
1661 int headersize, bodysize, fixed_size;
313e7b4d 1662 __u8 *digest = ep->digest;
1da177e4
LT		 1663 struct scatterlist sg;
1664 unsigned int keylen, len;
1665 char *key;
1666 sctp_scope_t scope;
1667 struct sk_buff *skb = chunk->skb;
a61bbcf2 1668 struct timeval tv;
1b489e11 1669 struct hash_desc desc;
1da177e4 1670
9834a2bb
VY		 1671 /* Header size is static data prior to the actual cookie, including
1672 * any padding.
1673 */
1674 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1675 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1676 sizeof(struct sctp_cookie));
1da177e4
LT		 1677 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1678 fixed_size = headersize + sizeof(struct sctp_cookie);
1679
1680 /* Verify that the chunk looks like it even has a cookie.
1681 * There must be enough room for our cookie and our peer's
1682 * INIT chunk.
1683 */
1684 len = ntohs(chunk->chunk_hdr->length);
1685 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1686 goto malformed;
1687
1688 /* Verify that the cookie has been padded out. */
1689 if (bodysize % SCTP_COOKIE_MULTIPLE)
1690 goto malformed;
1691
1692 /* Process the cookie. */
1693 cookie = chunk->subh.cookie_hdr;
1694 bear_cookie = &cookie->c;
1695
1696 if (!sctp_sk(ep->base.sk)->hmac)
1697 goto no_hmac;
1698
1699 /* Check the signature. */
1700 keylen = SCTP_SECRET_SIZE;
68e3f5dd 1701 sg_init_one(&sg, bear_cookie, bodysize);
1da177e4 1702 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1703 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1704 desc.flags = 0;
1da177e4 1705
8ca84481 1706 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1707 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1708 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1709 *error = -SCTP_IERROR_NOMEM;
1710 goto fail;
1711 }
1da177e4
LT		 1712
1713 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1714 /* Try the previous key. */
1715 key = (char *)ep->secret_key[ep->last_key];
8ca84481 1716 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1717 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1718 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1719 *error = -SCTP_IERROR_NOMEM;
1720 goto fail;
1721 }
1da177e4
LT		 1722
1723 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1724 /* Yikes! Still bad signature! */
1725 *error = -SCTP_IERROR_BAD_SIG;
1726 goto fail;
1727 }
1728 }
1729
1730no_hmac:
1731 /* IG Section 2.35.2:
1732 * 3) Compare the port numbers and the verification tag contained
1733 * within the COOKIE ECHO chunk to the actual port numbers and the
1734 * verification tag within the SCTP common header of the received
1735 * packet. If these values do not match the packet MUST be silently
1736 * discarded,
1737 */
1738 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1739 *error = -SCTP_IERROR_BAD_TAG;
1740 goto fail;
1741 }
1742
9b1dfad0 1743 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1744 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1745 *error = -SCTP_IERROR_BAD_PORTS;
1746 goto fail;
1747 }
1748
1749 /* Check to see if the cookie is stale. If there is already
1750 * an association, there is no need to check cookie's expiration
1751 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1752 * If skb has been timestamped, then use the stamp, otherwise
1753 * use current time. This introduces a small possibility that
1754 * that a cookie may be considered expired, but his would only slow
1755 * down the new association establishment instead of every packet.
1da177e4 1756 */
f236218b
VY		 1757 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1758 skb_get_timestamp(skb, &tv);
1759 else
1760 do_gettimeofday(&tv);
1761
a61bbcf2 1762 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1da177e4
LT		 1763 /*
1764 * Section 3.3.10.3 Stale Cookie Error (3)
1765 *
1766 * Cause of error
1767 * ---------------
1768 * Stale Cookie Error: Indicates the receipt of a valid State
1769 * Cookie that has expired.
1770 */
1771 len = ntohs(chunk->chunk_hdr->length);
1772 *errp = sctp_make_op_error_space(asoc, chunk, len);
1773 if (*errp) {
a61bbcf2 1774 suseconds_t usecs = (tv.tv_sec -
1da177e4 1775 bear_cookie->expiration.tv_sec) * 1000000L +
a61bbcf2 1776 tv.tv_usec - bear_cookie->expiration.tv_usec;
34bcca28 1777 __be32 n = htonl(usecs);
1da177e4 1778
1da177e4 1779 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1780 sizeof(n));
1781 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1782 *error = -SCTP_IERROR_STALE_COOKIE;
1783 } else
1784 *error = -SCTP_IERROR_NOMEM;
1785
1786 goto fail;
1787 }
1788
1789 /* Make a new base association. */
1790 scope = sctp_scope(sctp_source(chunk));
1791 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1792 if (!retval) {
1793 *error = -SCTP_IERROR_NOMEM;
1794 goto fail;
1795 }
1796
1797 /* Set up our peer's port number. */
1798 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1799
1800 /* Populate the association from the cookie. */
1801 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1802
1803 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1804 GFP_ATOMIC) < 0) {
1805 *error = -SCTP_IERROR_NOMEM;
1806 goto fail;
1807 }
1808
1809 /* Also, add the destination address. */
1810 if (list_empty(&retval->base.bind_addr.address_list)) {
f57d96b2
VY		 1811 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1812 SCTP_ADDR_SRC, GFP_ATOMIC);
1da177e4
LT		 1813 }
1814
1815 retval->next_tsn = retval->c.initial_tsn;
1816 retval->ctsn_ack_point = retval->next_tsn - 1;
1817 retval->addip_serial = retval->c.initial_tsn;
1818 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1819 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1820 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1821
1822 /* The INIT stuff will be done by the side effects. */
1823 return retval;
1824
1825fail:
1826 if (retval)
1827 sctp_association_free(retval);
1828
1829 return NULL;
1830
1831malformed:
1832 /* Yikes! The packet is either corrupt or deliberately
1833 * malformed.
1834 */
1835 *error = -SCTP_IERROR_MALFORMED;
1836 goto fail;
1837}
1838
1839/********************************************************************
1840 * 3rd Level Abstractions
1841 ********************************************************************/
1842
1843struct __sctp_missing {
9f81bcd9
AV		 1844 __be32 num_missing;
1845 __be16 type;
bc10502d 1846} __packed;
1da177e4
LT		 1847
1848/*
1849 * Report a missing mandatory parameter.
1850 */
1851static int sctp_process_missing_param(const struct sctp_association *asoc,
1852 sctp_param_t paramtype,
1853 struct sctp_chunk *chunk,
1854 struct sctp_chunk **errp)
1855{
1856 struct __sctp_missing report;
1857 __u16 len;
1858
1859 len = WORD_ROUND(sizeof(report));
1860
1861 /* Make an ERROR chunk, preparing enough room for
1862 * returning multiple unknown parameters.
1863 */
1864 if (!*errp)
1865 *errp = sctp_make_op_error_space(asoc, chunk, len);
1866
1867 if (*errp) {
1868 report.num_missing = htonl(1);
1869 report.type = paramtype;
ebdfcad4 1870 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1871 sizeof(report));
1872 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1873 }
1874
1875 /* Stop processing this chunk. */
1876 return 0;
1877}
1878
1879/* Report an Invalid Mandatory Parameter. */
1880static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1881 struct sctp_chunk *chunk,
1882 struct sctp_chunk **errp)
1883{
1884 /* Invalid Mandatory Parameter Error has no payload. */
1885
1886 if (!*errp)
1887 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1888
1889 if (*errp)
00f1c2df 1890 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1891
1892 /* Stop processing this chunk. */
1893 return 0;
1894}
1895
1896static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1897 struct sctp_paramhdr *param,
1898 const struct sctp_chunk *chunk,
1899 struct sctp_chunk **errp)
1900{
7ab90804
VY		 1901 /* This is a fatal error. Any accumulated non-fatal errors are
1902 * not reported.
1903 */
1904 if (*errp)
1905 sctp_chunk_free(*errp);
1906
1da177e4 1907 /* Create an error chunk and fill it in with our payload. */
ba016670 1908 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1da177e4
LT		 1909
1910 return 0;
1911}
1912
1913
1914/* Do not attempt to handle the HOST_NAME parm. However, do
1915 * send back an indicator to the peer.
1916 */
1917static int sctp_process_hn_param(const struct sctp_association *asoc,
1918 union sctp_params param,
1919 struct sctp_chunk *chunk,
1920 struct sctp_chunk **errp)
1921{
1922 __u16 len = ntohs(param.p->length);
1923
7ab90804
VY		 1924 /* Processing of the HOST_NAME parameter will generate an
1925 * ABORT. If we've accumulated any non-fatal errors, they
1926 * would be unrecognized parameters and we should not include
1927 * them in the ABORT.
1928 */
1929 if (*errp)
1930 sctp_chunk_free(*errp);
1931
1932 *errp = sctp_make_op_error_space(asoc, chunk, len);
1da177e4 1933
00f1c2df
WY		 1934 if (*errp) {
1935 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1936 sctp_addto_chunk(*errp, len, param.v);
1937 }
1da177e4
LT		 1938
1939 /* Stop processing this chunk. */
1940 return 0;
1941}
1942
d6701191
VY		 1943static int sctp_verify_ext_param(union sctp_params param)
1944{
1945 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1946 int have_auth = 0;
1947 int have_asconf = 0;
1948 int i;
1949
1950 for (i = 0; i < num_ext; i++) {
1951 switch (param.ext->chunks[i]) {
1952 case SCTP_CID_AUTH:
1953 have_auth = 1;
1954 break;
1955 case SCTP_CID_ASCONF:
1956 case SCTP_CID_ASCONF_ACK:
1957 have_asconf = 1;
1958 break;
1959 }
1960 }
1961
1962 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1963 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1964 * only if ADD-IP is turned on and we are not backward-compatible
1965 * mode.
1966 */
1967 if (sctp_addip_noauth)
1968 return 1;
1969
1970 if (sctp_addip_enable && !have_auth && have_asconf)
1971 return 0;
1972
1973 return 1;
1974}
1975
131a47e3
VY		 1976static void sctp_process_ext_param(struct sctp_association *asoc,
1977 union sctp_params param)
1978{
1979 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1980 int i;
1981
1982 for (i = 0; i < num_ext; i++) {
1983 switch (param.ext->chunks[i]) {
1984 case SCTP_CID_FWD_TSN:
1985 if (sctp_prsctp_enable &&
1986 !asoc->peer.prsctp_capable)
1987 asoc->peer.prsctp_capable = 1;
1988 break;
730fc3d0
VY		 1989 case SCTP_CID_AUTH:
1990 /* if the peer reports AUTH, assume that he
1991 * supports AUTH.
1992 */
0ef46e28
VY		 1993 if (sctp_auth_enable)
1994 asoc->peer.auth_capable = 1;
730fc3d0 1995 break;
131a47e3
VY		 1996 case SCTP_CID_ASCONF:
1997 case SCTP_CID_ASCONF_ACK:
0ef46e28
VY		 1998 if (sctp_addip_enable)
1999 asoc->peer.asconf_capable = 1;
6b2f9cb6 2000 break;
131a47e3
VY		 2001 default:
2002 break;
2003 }
2004 }
2005}
2006
1da177e4
LT		 2007/* RFC 3.2.1 & the Implementers Guide 2.2.
2008 *
2009 * The Parameter Types are encoded such that the
2010 * highest-order two bits specify the action that must be
2011 * taken if the processing endpoint does not recognize the
2012 * Parameter Type.
2013 *
7ab90804
VY		 2014 * 00 - Stop processing this parameter; do not process any further
2015 * parameters within this chunk
1da177e4 2016 *
7ab90804
VY		 2017 * 01 - Stop processing this parameter, do not process any further
2018 * parameters within this chunk, and report the unrecognized
2019 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2020 *
2021 * 10 - Skip this parameter and continue processing.
2022 *
2023 * 11 - Skip this parameter and continue processing but
2024 * report the unrecognized parameter in an
7ab90804 2025 * 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2026 *
2027 * Return value:
7ab90804
VY		 2028 * SCTP_IERROR_NO_ERROR - continue with the chunk
2029 * SCTP_IERROR_ERROR - stop and report an error.
2030 * SCTP_IERROR_NOMEME - out of memory.
1da177e4 2031 */
7ab90804
VY		 2032static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2033 union sctp_params param,
2034 struct sctp_chunk *chunk,
2035 struct sctp_chunk **errp)
1da177e4 2036{
7ab90804 2037 int retval = SCTP_IERROR_NO_ERROR;
1da177e4
LT		 2038
2039 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2040 case SCTP_PARAM_ACTION_DISCARD:
7ab90804 2041 retval = SCTP_IERROR_ERROR;
1da177e4
LT		 2042 break;
2043 case SCTP_PARAM_ACTION_SKIP:
2044 break;
7ab90804
VY		 2045 case SCTP_PARAM_ACTION_DISCARD_ERR:
2046 retval = SCTP_IERROR_ERROR;
2047 /* Fall through */
1da177e4
LT		 2048 case SCTP_PARAM_ACTION_SKIP_ERR:
2049 /* Make an ERROR chunk, preparing enough room for
2050 * returning multiple unknown parameters.
2051 */
2052 if (NULL == *errp)
5fa782c2 2053 *errp = sctp_make_op_error_fixed(asoc, chunk);
1da177e4
LT		 2054
2055 if (*errp) {
2205a6ea
JB		 2056 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2057 WORD_ROUND(ntohs(param.p->length))))
2058 sctp_addto_chunk_fixed(*errp,
2059 WORD_ROUND(ntohs(param.p->length)),
2060 param.v);
1da177e4
LT		 2061 } else {
2062 /* If there is no memory for generating the ERROR
2063 * report as specified, an ABORT will be triggered
2064 * to the peer and the association won't be
2065 * established.
2066 */
7ab90804 2067 retval = SCTP_IERROR_NOMEM;
1da177e4 2068 }
1da177e4
LT		 2069 break;
2070 default:
2071 break;
2072 }
2073
2074 return retval;
2075}
2076
7ab90804 2077/* Verify variable length parameters
1da177e4 2078 * Return values:
7ab90804
VY		 2079 * SCTP_IERROR_ABORT - trigger an ABORT
2080 * SCTP_IERROR_NOMEM - out of memory (abort)
2081 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2082 * SCTP_IERROR_NO_ERROR - continue with the chunk
1da177e4 2083 */
7ab90804
VY		 2084static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2085 union sctp_params param,
2086 sctp_cid_t cid,
2087 struct sctp_chunk *chunk,
2088 struct sctp_chunk **err_chunk)
1da177e4 2089{
72da7b38 2090 struct sctp_hmac_algo_param *hmacs;
7ab90804 2091 int retval = SCTP_IERROR_NO_ERROR;
72da7b38
WY		 2092 __u16 n_elt, id = 0;
2093 int i;
1da177e4
LT		 2094
2095 /* FIXME - This routine is not looking at each parameter per the
2096 * chunk type, i.e., unrecognized parameters should be further
2097 * identified based on the chunk id.
2098 */
2099
2100 switch (param.p->type) {
2101 case SCTP_PARAM_IPV4_ADDRESS:
2102 case SCTP_PARAM_IPV6_ADDRESS:
2103 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2104 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2105 case SCTP_PARAM_STATE_COOKIE:
2106 case SCTP_PARAM_HEARTBEAT_INFO:
2107 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2108 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 2109 case SCTP_PARAM_ADAPTATION_LAYER_IND:
d6701191
VY		 2110 break;
2111
131a47e3 2112 case SCTP_PARAM_SUPPORTED_EXT:
d6701191
VY		 2113 if (!sctp_verify_ext_param(param))
2114 return SCTP_IERROR_ABORT;
1da177e4
LT		 2115 break;
2116
d6de3097
VY		 2117 case SCTP_PARAM_SET_PRIMARY:
2118 if (sctp_addip_enable)
2119 break;
2120 goto fallthrough;
2121
1da177e4
LT		 2122 case SCTP_PARAM_HOST_NAME_ADDRESS:
2123 /* Tell the peer, we won't support this param. */
7ab90804
VY		 2124 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2125 retval = SCTP_IERROR_ABORT;
2126 break;
131a47e3 2127
1da177e4
LT		 2128 case SCTP_PARAM_FWD_TSN_SUPPORT:
2129 if (sctp_prsctp_enable)
2130 break;
730fc3d0
VY		 2131 goto fallthrough;
2132
2133 case SCTP_PARAM_RANDOM:
2134 if (!sctp_auth_enable)
2135 goto fallthrough;
2136
2137 /* SCTP-AUTH: Secion 6.1
2138 * If the random number is not 32 byte long the association
2139 * MUST be aborted. The ABORT chunk SHOULD contain the error
2140 * cause 'Protocol Violation'.
2141 */
2142 if (SCTP_AUTH_RANDOM_LENGTH !=
7ab90804
VY		 2143 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2144 sctp_process_inv_paramlength(asoc, param.p,
730fc3d0 2145 chunk, err_chunk);
7ab90804
VY		 2146 retval = SCTP_IERROR_ABORT;
2147 }
730fc3d0
VY		 2148 break;
2149
2150 case SCTP_PARAM_CHUNKS:
2151 if (!sctp_auth_enable)
2152 goto fallthrough;
2153
2154 /* SCTP-AUTH: Section 3.2
2155 * The CHUNKS parameter MUST be included once in the INIT or
2156 * INIT-ACK chunk if the sender wants to receive authenticated
2157 * chunks. Its maximum length is 260 bytes.
2158 */
7ab90804
VY		 2159 if (260 < ntohs(param.p->length)) {
2160 sctp_process_inv_paramlength(asoc, param.p,
2161 chunk, err_chunk);
2162 retval = SCTP_IERROR_ABORT;
2163 }
730fc3d0
VY		 2164 break;
2165
2166 case SCTP_PARAM_HMAC_ALGO:
72da7b38
WY		 2167 if (!sctp_auth_enable)
2168 goto fallthrough;
2169
2170 hmacs = (struct sctp_hmac_algo_param *)param.p;
2171 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2172
2173 /* SCTP-AUTH: Section 6.1
2174 * The HMAC algorithm based on SHA-1 MUST be supported and
2175 * included in the HMAC-ALGO parameter.
2176 */
2177 for (i = 0; i < n_elt; i++) {
2178 id = ntohs(hmacs->hmac_ids[i]);
2179
2180 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2181 break;
2182 }
2183
2184 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2185 sctp_process_inv_paramlength(asoc, param.p, chunk,
2186 err_chunk);
2187 retval = SCTP_IERROR_ABORT;
2188 }
2189 break;
730fc3d0 2190fallthrough:
1da177e4
LT		 2191 default:
2192 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2193 ntohs(param.p->type), cid);
7ab90804 2194 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
1da177e4
LT		 2195 break;
2196 }
2197 return retval;
2198}
2199
2200/* Verify the INIT packet before we process it. */
2201int sctp_verify_init(const struct sctp_association *asoc,
2202 sctp_cid_t cid,
2203 sctp_init_chunk_t *peer_init,
2204 struct sctp_chunk *chunk,
2205 struct sctp_chunk **errp)
2206{
2207 union sctp_params param;
2208 int has_cookie = 0;
7ab90804 2209 int result;
1da177e4
LT		 2210
2211 /* Verify stream values are non-zero. */
2212 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
d023f629
VY		 2213 (0 == peer_init->init_hdr.num_inbound_streams) ||
2214 (0 == peer_init->init_hdr.init_tag) ||
2215 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
1da177e4 2216
7ab90804 2217 return sctp_process_inv_mandatory(asoc, chunk, errp);
1da177e4
LT		 2218 }
2219
2220 /* Check for missing mandatory parameters. */
2221 sctp_walk_params(param, peer_init, init_hdr.params) {
2222
2223 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2224 has_cookie = 1;
2225
2226 } /* for (loop through all parameters) */
2227
2228 /* There is a possibility that a parameter length was bad and
2229 * in that case we would have stoped walking the parameters.
2230 * The current param.p would point at the bad one.
2231 * Current consensus on the mailing list is to generate a PROTOCOL
2232 * VIOLATION error. We build the ERROR chunk here and let the normal
2233 * error handling code build and send the packet.
2234 */
7ab90804
VY		 2235 if (param.v != (void*)chunk->chunk_end)
2236 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
1da177e4
LT		 2237
2238 /* The only missing mandatory param possible today is
2239 * the state cookie for an INIT-ACK chunk.
2240 */
7ab90804
VY		 2241 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2242 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2243 chunk, errp);
1da177e4 2244
7ab90804 2245 /* Verify all the variable length parameters */
1da177e4
LT		 2246 sctp_walk_params(param, peer_init, init_hdr.params) {
2247
7ab90804
VY		 2248 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2249 switch (result) {
2250 case SCTP_IERROR_ABORT:
2251 case SCTP_IERROR_NOMEM:
1da177e4 2252 return 0;
7ab90804 2253 case SCTP_IERROR_ERROR:
1da177e4 2254 return 1;
7ab90804
VY		 2255 case SCTP_IERROR_NO_ERROR:
2256 default:
2257 break;
1da177e4
LT		 2258 }
2259
2260 } /* for (loop through all parameters) */
2261
2262 return 1;
2263}
2264
2265/* Unpack the parameters in an INIT packet into an association.
2266 * Returns 0 on failure, else success.
2267 * FIXME: This is an association method.
2268 */
de6becdc 2269int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
1da177e4 2270 const union sctp_addr *peer_addr,
dd0fc66f 2271 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4
LT		 2272{
2273 union sctp_params param;
2274 struct sctp_transport *transport;
2275 struct list_head *pos, *temp;
de6becdc
WY		 2276 struct sctp_af *af;
2277 union sctp_addr addr;
1da177e4 2278 char *cookie;
de6becdc 2279 int src_match = 0;
1da177e4
LT		 2280
2281 /* We must include the address that the INIT packet came from.
2282 * This is the only address that matters for an INIT packet.
2283 * When processing a COOKIE ECHO, we retrieve the from address
2284 * of the INIT from the cookie.
2285 */
2286
2287 /* This implementation defaults to making the first transport
2288 * added as the primary transport. The source address seems to
2289 * be a a better choice than any of the embedded addresses.
2290 */
de6becdc
WY		 2291 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2292 goto nomem;
2293
2294 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2295 src_match = 1;
1da177e4
LT		 2296
2297 /* Process the initialization parameters. */
1da177e4 2298 sctp_walk_params(param, peer_init, init_hdr.params) {
de6becdc
WY		 2299 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2300 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2301 af = sctp_get_af_specific(param_type2af(param.p->type));
2302 af->from_addr_param(&addr, param.addr,
2303 chunk->sctp_hdr->source, 0);
2304 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2305 src_match = 1;
2306 }
1da177e4
LT		 2307
2308 if (!sctp_process_param(asoc, param, peer_addr, gfp))
d808ad9a 2309 goto clean_up;
1da177e4
LT		 2310 }
2311
de6becdc
WY		 2312 /* source address of chunk may not match any valid address */
2313 if (!src_match)
2314 goto clean_up;
2315
730fc3d0
VY		 2316 /* AUTH: After processing the parameters, make sure that we
2317 * have all the required info to potentially do authentications.
2318 */
2319 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2320 !asoc->peer.peer_hmacs))
2321 asoc->peer.auth_capable = 0;
2322
d6701191
VY		 2323 /* In a non-backward compatible mode, if the peer claims
2324 * support for ADD-IP but not AUTH, the ADD-IP spec states
2325 * that we MUST ABORT the association. Section 6. The section
2326 * also give us an option to silently ignore the packet, which
2327 * is what we'll do here.
6b2f9cb6 2328 */
73d9c4fd
VY		 2329 if (!sctp_addip_noauth &&
2330 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
6b2f9cb6
VY		 2331 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2332 SCTP_PARAM_DEL_IP |
2333 SCTP_PARAM_SET_PRIMARY);
88799fe5 2334 asoc->peer.asconf_capable = 0;
d6701191 2335 goto clean_up;
6b2f9cb6
VY		 2336 }
2337
3f7a87d2
FF		 2338 /* Walk list of transports, removing transports in the UNKNOWN state. */
2339 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2340 transport = list_entry(pos, struct sctp_transport, transports);
2341 if (transport->state == SCTP_UNKNOWN) {
2342 sctp_assoc_rm_peer(asoc, transport);
2343 }
2344 }
2345
1da177e4
LT		 2346 /* The fixed INIT headers are always in network byte
2347 * order.
2348 */
2349 asoc->peer.i.init_tag =
2350 ntohl(peer_init->init_hdr.init_tag);
2351 asoc->peer.i.a_rwnd =
2352 ntohl(peer_init->init_hdr.a_rwnd);
2353 asoc->peer.i.num_outbound_streams =
2354 ntohs(peer_init->init_hdr.num_outbound_streams);
2355 asoc->peer.i.num_inbound_streams =
2356 ntohs(peer_init->init_hdr.num_inbound_streams);
2357 asoc->peer.i.initial_tsn =
2358 ntohl(peer_init->init_hdr.initial_tsn);
2359
2360 /* Apply the upper bounds for output streams based on peer's
2361 * number of inbound streams.
2362 */
2363 if (asoc->c.sinit_num_ostreams >
2364 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2365 asoc->c.sinit_num_ostreams =
2366 ntohs(peer_init->init_hdr.num_inbound_streams);
2367 }
2368
2369 if (asoc->c.sinit_max_instreams >
2370 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2371 asoc->c.sinit_max_instreams =
2372 ntohs(peer_init->init_hdr.num_outbound_streams);
2373 }
2374
2375 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2376 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2377
2378 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2379 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2380
2381 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2382 cookie = asoc->peer.cookie;
2383 if (cookie) {
af997d8c 2384 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
1da177e4
LT		 2385 if (!asoc->peer.cookie)
2386 goto clean_up;
1da177e4
LT		 2387 }
2388
2389 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2390 * high (for example, implementations MAY use the size of the receiver
2391 * advertised window).
2392 */
9dbc15f0
RD		 2393 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2394 transports) {
1da177e4
LT		 2395 transport->ssthresh = asoc->peer.i.a_rwnd;
2396 }
2397
2398 /* Set up the TSN tracking pieces. */
8e1ee18c
VY		 2399 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2400 asoc->peer.i.initial_tsn, gfp))
2401 goto clean_up;
1da177e4
LT		 2402
2403 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2404 *
2405 * The stream sequence number in all the streams shall start
2406 * from 0 when the association is established. Also, when the
2407 * stream sequence number reaches the value 65535 the next
2408 * stream sequence number shall be set to 0.
2409 */
2410
3f7a87d2 2411 /* Allocate storage for the negotiated streams if it is not a temporary
d808ad9a 2412 * association.
1da177e4
LT		 2413 */
2414 if (!asoc->temp) {
1da177e4
LT		 2415 int error;
2416
2417 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2418 asoc->c.sinit_num_ostreams, gfp);
2419 if (!asoc->ssnmap)
2420 goto clean_up;
2421
07d93967
VY		 2422 error = sctp_assoc_set_id(asoc, gfp);
2423 if (error)
1da177e4 2424 goto clean_up;
1da177e4
LT		 2425 }
2426
2427 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2428 *
2429 * When an endpoint has an ASCONF signaled change to be sent to the
2430 * remote endpoint it should do the following:
2431 * ...
2432 * A2) A serial number should be assigned to the Chunk. The serial
2433 * number should be a monotonically increasing number. All serial
2434 * numbers are defined to be initialized at the start of the
2435 * association to the same value as the Initial TSN.
2436 */
2437 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2438 return 1;
2439
2440clean_up:
2441 /* Release the transport structures. */
2442 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2443 transport = list_entry(pos, struct sctp_transport, transports);
add52379
VY		 2444 if (transport->state != SCTP_ACTIVE)
2445 sctp_assoc_rm_peer(asoc, transport);
1da177e4 2446 }
3f7a87d2 2447
1da177e4
LT		 2448nomem:
2449 return 0;
2450}
2451
2452
2453/* Update asoc with the option described in param.
2454 *
2455 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2456 *
2457 * asoc is the association to update.
2458 * param is the variable length parameter to use for update.
2459 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2460 * If the current packet is an INIT we want to minimize the amount of
2461 * work we do. In particular, we should not build transport
2462 * structures for the addresses.
2463 */
2464static int sctp_process_param(struct sctp_association *asoc,
2465 union sctp_params param,
2466 const union sctp_addr *peer_addr,
dd0fc66f 2467 gfp_t gfp)
1da177e4
LT		 2468{
2469 union sctp_addr addr;
2470 int i;
2471 __u16 sat;
2472 int retval = 1;
2473 sctp_scope_t scope;
2474 time_t stale;
2475 struct sctp_af *af;
d6de3097
VY		 2476 union sctp_addr_param *addr_param;
2477 struct sctp_transport *t;
1da177e4
LT		 2478
2479 /* We maintain all INIT parameters in network byte order all the
2480 * time. This allows us to not worry about whether the parameters
2481 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2482 */
2483 switch (param.p->type) {
2484 case SCTP_PARAM_IPV6_ADDRESS:
2485 if (PF_INET6 != asoc->base.sk->sk_family)
2486 break;
7dab83de
VY		 2487 goto do_addr_param;
2488
1da177e4 2489 case SCTP_PARAM_IPV4_ADDRESS:
7dab83de
VY		 2490 /* v4 addresses are not allowed on v6-only socket */
2491 if (ipv6_only_sock(asoc->base.sk))
2492 break;
2493do_addr_param:
1da177e4 2494 af = sctp_get_af_specific(param_type2af(param.p->type));
dd86d136 2495 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
1da177e4 2496 scope = sctp_scope(peer_addr);
dd86d136
AV		 2497 if (sctp_in_scope(&addr, scope))
2498 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2499 return 0;
2500 break;
2501
2502 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2503 if (!sctp_cookie_preserve_enable)
2504 break;
2505
2506 stale = ntohl(param.life->lifespan_increment);
2507
2508 /* Suggested Cookie Life span increment's unit is msec,
2509 * (1/1000sec).
2510 */
2511 asoc->cookie_life.tv_sec += stale / 1000;
2512 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2513 break;
2514
2515 case SCTP_PARAM_HOST_NAME_ADDRESS:
2516 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2517 break;
2518
2519 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2520 /* Turn off the default values first so we'll know which
2521 * ones are really set by the peer.
2522 */
2523 asoc->peer.ipv4_address = 0;
2524 asoc->peer.ipv6_address = 0;
2525
140ee960
GJ		 2526 /* Assume that peer supports the address family
2527 * by which it sends a packet.
2528 */
2529 if (peer_addr->sa.sa_family == AF_INET6)
2530 asoc->peer.ipv6_address = 1;
2531 else if (peer_addr->sa.sa_family == AF_INET)
2532 asoc->peer.ipv4_address = 1;
2533
1da177e4
LT		 2534 /* Cycle through address types; avoid divide by 0. */
2535 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2536 if (sat)
2537 sat /= sizeof(__u16);
2538
2539 for (i = 0; i < sat; ++i) {
2540 switch (param.sat->types[i]) {
2541 case SCTP_PARAM_IPV4_ADDRESS:
2542 asoc->peer.ipv4_address = 1;
2543 break;
2544
2545 case SCTP_PARAM_IPV6_ADDRESS:
6e40a915
WY		 2546 if (PF_INET6 == asoc->base.sk->sk_family)
2547 asoc->peer.ipv6_address = 1;
1da177e4
LT		 2548 break;
2549
2550 case SCTP_PARAM_HOST_NAME_ADDRESS:
2551 asoc->peer.hostname_address = 1;
2552 break;
2553
2554 default: /* Just ignore anything else. */
2555 break;
3ff50b79 2556 }
1da177e4
LT		 2557 }
2558 break;
2559
2560 case SCTP_PARAM_STATE_COOKIE:
2561 asoc->peer.cookie_len =
2562 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2563 asoc->peer.cookie = param.cookie->body;
2564 break;
2565
2566 case SCTP_PARAM_HEARTBEAT_INFO:
2567 /* Would be odd to receive, but it causes no problems. */
2568 break;
2569
2570 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2571 /* Rejected during verify stage. */
2572 break;
2573
2574 case SCTP_PARAM_ECN_CAPABLE:
2575 asoc->peer.ecn_capable = 1;
2576 break;
2577
0f3fffd8 2578 case SCTP_PARAM_ADAPTATION_LAYER_IND:
e69c4e0f 2579 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
1da177e4
LT		 2580 break;
2581
d6de3097 2582 case SCTP_PARAM_SET_PRIMARY:
0ef46e28
VY		 2583 if (!sctp_addip_enable)
2584 goto fall_through;
2585
d6de3097
VY		 2586 addr_param = param.v + sizeof(sctp_addip_param_t);
2587
2588 af = sctp_get_af_specific(param_type2af(param.p->type));
2589 af->from_addr_param(&addr, addr_param,
2590 htons(asoc->peer.port), 0);
2591
2592 /* if the address is invalid, we can't process it.
2593 * XXX: see spec for what to do.
2594 */
2595 if (!af->addr_valid(&addr, NULL, NULL))
2596 break;
2597
2598 t = sctp_assoc_lookup_paddr(asoc, &addr);
2599 if (!t)
2600 break;
2601
2602 sctp_assoc_set_primary(asoc, t);
2603 break;
2604
131a47e3
VY		 2605 case SCTP_PARAM_SUPPORTED_EXT:
2606 sctp_process_ext_param(asoc, param);
2607 break;
2608
1da177e4
LT		 2609 case SCTP_PARAM_FWD_TSN_SUPPORT:
2610 if (sctp_prsctp_enable) {
2611 asoc->peer.prsctp_capable = 1;
2612 break;
2613 }
d808ad9a 2614 /* Fall Through */
730fc3d0
VY		 2615 goto fall_through;
2616
2617 case SCTP_PARAM_RANDOM:
2618 if (!sctp_auth_enable)
2619 goto fall_through;
2620
2621 /* Save peer's random parameter */
2622 asoc->peer.peer_random = kmemdup(param.p,
2623 ntohs(param.p->length), gfp);
2624 if (!asoc->peer.peer_random) {
2625 retval = 0;
2626 break;
2627 }
2628 break;
2629
2630 case SCTP_PARAM_HMAC_ALGO:
2631 if (!sctp_auth_enable)
2632 goto fall_through;
2633
2634 /* Save peer's HMAC list */
2635 asoc->peer.peer_hmacs = kmemdup(param.p,
2636 ntohs(param.p->length), gfp);
2637 if (!asoc->peer.peer_hmacs) {
2638 retval = 0;
2639 break;
2640 }
2641
2642 /* Set the default HMAC the peer requested*/
2643 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2644 break;
2645
2646 case SCTP_PARAM_CHUNKS:
2647 if (!sctp_auth_enable)
2648 goto fall_through;
2649
2650 asoc->peer.peer_chunks = kmemdup(param.p,
2651 ntohs(param.p->length), gfp);
2652 if (!asoc->peer.peer_chunks)
2653 retval = 0;
2654 break;
2655fall_through:
1da177e4
LT		 2656 default:
2657 /* Any unrecognized parameters should have been caught
2658 * and handled by sctp_verify_param() which should be
2659 * called prior to this routine. Simply log the error
2660 * here.
2661 */
2662 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2663 ntohs(param.p->type), asoc);
2664 break;
3ff50b79 2665 }
1da177e4
LT		 2666
2667 return retval;
2668}
2669
2670/* Select a new verification tag. */
2671__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2672{
2673 /* I believe that this random number generator complies with RFC1750.
2674 * A tag of 0 is reserved for special cases (e.g. INIT).
2675 */
2676 __u32 x;
2677
2678 do {
2679 get_random_bytes(&x, sizeof(__u32));
2680 } while (x == 0);
2681
2682 return x;
2683}
2684
2685/* Select an initial TSN to send during startup. */
2686__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2687{
2688 __u32 retval;
2689
2690 get_random_bytes(&retval, sizeof(__u32));
2691 return retval;
2692}
2693
2694/*
2695 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2696 * 0 1 2 3
2697 * 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
2698 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2699 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2700 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2701 * | Serial Number |
2702 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2703 * | Address Parameter |
2704 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2705 * | ASCONF Parameter #1 |
2706 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2707 * \ \
2708 * / .... /
2709 * \ \
2710 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2711 * | ASCONF Parameter #N |
2712 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2713 *
d808ad9a 2714 * Address Parameter and other parameter will not be wrapped in this function
1da177e4
LT		 2715 */
2716static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2717 union sctp_addr *addr,
2718 int vparam_len)
2719{
2720 sctp_addiphdr_t asconf;
2721 struct sctp_chunk *retval;
2722 int length = sizeof(asconf) + vparam_len;
2723 union sctp_addr_param addrparam;
2724 int addrlen;
2725 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2726
2727 addrlen = af->to_addr_param(addr, &addrparam);
2728 if (!addrlen)
2729 return NULL;
2730 length += addrlen;
2731
2732 /* Create the chunk. */
2733 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2734 if (!retval)
2735 return NULL;
2736
2737 asconf.serial = htonl(asoc->addip_serial++);
2738
2739 retval->subh.addip_hdr =
2740 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2741 retval->param_hdr.v =
2742 sctp_addto_chunk(retval, addrlen, &addrparam);
2743
2744 return retval;
2745}
2746
2747/* ADDIP
2748 * 3.2.1 Add IP Address
2749 * 0 1 2 3
2750 * 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
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2752 * | Type = 0xC001 | Length = Variable |
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | ASCONF-Request Correlation ID |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * | Address Parameter |
2757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2758 *
2759 * 3.2.2 Delete IP Address
2760 * 0 1 2 3
2761 * 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
2762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2763 * | Type = 0xC002 | Length = Variable |
2764 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2765 * | ASCONF-Request Correlation ID |
2766 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2767 * | Address Parameter |
2768 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2769 *
2770 */
2771struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2772 union sctp_addr *laddr,
2773 struct sockaddr *addrs,
2774 int addrcnt,
dbc16db1 2775 __be16 flags)
1da177e4
LT		 2776{
2777 sctp_addip_param_t param;
2778 struct sctp_chunk *retval;
2779 union sctp_addr_param addr_param;
2780 union sctp_addr *addr;
2781 void *addr_buf;
2782 struct sctp_af *af;
2783 int paramlen = sizeof(param);
2784 int addr_param_len = 0;
2785 int totallen = 0;
2786 int i;
8a07eb0a 2787 int del_pickup = 0;
1da177e4
LT		 2788
2789 /* Get total length of all the address parameters. */
2790 addr_buf = addrs;
2791 for (i = 0; i < addrcnt; i++) {
ea110733 2792 addr = addr_buf;
1da177e4
LT		 2793 af = sctp_get_af_specific(addr->v4.sin_family);
2794 addr_param_len = af->to_addr_param(addr, &addr_param);
2795
2796 totallen += paramlen;
2797 totallen += addr_param_len;
2798
2799 addr_buf += af->sockaddr_len;
8a07eb0a
MH		 2800 if (asoc->asconf_addr_del_pending && !del_pickup) {
2801 /* reuse the parameter length from the same scope one */
2802 totallen += paramlen;
2803 totallen += addr_param_len;
2804 del_pickup = 1;
2805 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
2806 }
1da177e4
LT		 2807 }
2808
2809 /* Create an asconf chunk with the required length. */
2810 retval = sctp_make_asconf(asoc, laddr, totallen);
2811 if (!retval)
2812 return NULL;
2813
2814 /* Add the address parameters to the asconf chunk. */
2815 addr_buf = addrs;
2816 for (i = 0; i < addrcnt; i++) {
ea110733 2817 addr = addr_buf;
1da177e4
LT		 2818 af = sctp_get_af_specific(addr->v4.sin_family);
2819 addr_param_len = af->to_addr_param(addr, &addr_param);
2820 param.param_hdr.type = flags;
2821 param.param_hdr.length = htons(paramlen + addr_param_len);
2822 param.crr_id = i;
2823
2824 sctp_addto_chunk(retval, paramlen, &param);
2825 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2826
2827 addr_buf += af->sockaddr_len;
2828 }
8a07eb0a
MH		 2829 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2830 addr = asoc->asconf_addr_del_pending;
2831 af = sctp_get_af_specific(addr->v4.sin_family);
2832 addr_param_len = af->to_addr_param(addr, &addr_param);
2833 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2834 param.param_hdr.length = htons(paramlen + addr_param_len);
2835 param.crr_id = i;
2836
2837 sctp_addto_chunk(retval, paramlen, &param);
2838 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2839 }
1da177e4
LT		 2840 return retval;
2841}
2842
2843/* ADDIP
2844 * 3.2.4 Set Primary IP Address
2845 * 0 1 2 3
2846 * 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
2847 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2848 * | Type =0xC004 | Length = Variable |
2849 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2850 * | ASCONF-Request Correlation ID |
2851 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2852 * | Address Parameter |
2853 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2854 *
d808ad9a 2855 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2856 */
2857struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2858 union sctp_addr *addr)
2859{
2860 sctp_addip_param_t param;
2861 struct sctp_chunk *retval;
2862 int len = sizeof(param);
2863 union sctp_addr_param addrparam;
2864 int addrlen;
2865 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2866
2867 addrlen = af->to_addr_param(addr, &addrparam);
2868 if (!addrlen)
2869 return NULL;
2870 len += addrlen;
2871
2872 /* Create the chunk and make asconf header. */
2873 retval = sctp_make_asconf(asoc, addr, len);
2874 if (!retval)
2875 return NULL;
2876
2877 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2878 param.param_hdr.length = htons(len);
2879 param.crr_id = 0;
2880
2881 sctp_addto_chunk(retval, sizeof(param), &param);
2882 sctp_addto_chunk(retval, addrlen, &addrparam);
2883
2884 return retval;
2885}
2886
2887/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2888 * 0 1 2 3
2889 * 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
2890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * | Type = 0x80 | Chunk Flags | Chunk Length |
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2893 * | Serial Number |
2894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * | ASCONF Parameter Response#1 |
2896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2897 * \ \
2898 * / .... /
2899 * \ \
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | ASCONF Parameter Response#N |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2903 *
d808ad9a 2904 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2905 */
2906static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2907 __u32 serial, int vparam_len)
2908{
2909 sctp_addiphdr_t asconf;
2910 struct sctp_chunk *retval;
2911 int length = sizeof(asconf) + vparam_len;
2912
2913 /* Create the chunk. */
2914 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2915 if (!retval)
2916 return NULL;
2917
2918 asconf.serial = htonl(serial);
2919
2920 retval->subh.addip_hdr =
2921 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2922
2923 return retval;
2924}
2925
2926/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2927static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2928 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2929{
2930 sctp_addip_param_t ack_param;
2931 sctp_errhdr_t err_param;
2932 int asconf_param_len = 0;
2933 int err_param_len = 0;
dbc16db1 2934 __be16 response_type;
1da177e4
LT		 2935
2936 if (SCTP_ERROR_NO_ERROR == err_code) {
2937 response_type = SCTP_PARAM_SUCCESS_REPORT;
2938 } else {
2939 response_type = SCTP_PARAM_ERR_CAUSE;
2940 err_param_len = sizeof(err_param);
2941 if (asconf_param)
2942 asconf_param_len =
2943 ntohs(asconf_param->param_hdr.length);
2944 }
2945
d808ad9a 2946 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2947 ack_param.param_hdr.type = response_type;
2948 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2949 err_param_len +
2950 asconf_param_len);
2951 ack_param.crr_id = crr_id;
2952 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2953
2954 if (SCTP_ERROR_NO_ERROR == err_code)
2955 return;
2956
2957 /* Add Error Cause parameter. */
2958 err_param.cause = err_code;
2959 err_param.length = htons(err_param_len + asconf_param_len);
2960 sctp_addto_chunk(chunk, err_param_len, &err_param);
2961
2962 /* Add the failed TLV copied from ASCONF chunk. */
2963 if (asconf_param)
2964 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2965}
2966
2967/* Process a asconf parameter. */
dbc16db1 2968static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2969 struct sctp_chunk *asconf,
2970 sctp_addip_param_t *asconf_param)
2971{
2972 struct sctp_transport *peer;
2973 struct sctp_af *af;
2974 union sctp_addr addr;
1da177e4 2975 union sctp_addr_param *addr_param;
5f242a13 2976
ea110733 2977 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
c1cc678a 2978
44e65c1e
WY		 2979 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2980 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2981 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2982 return SCTP_ERROR_UNKNOWN_PARAM;
2983
6a435732 2984 switch (addr_param->p.type) {
c4492586
WY		 2985 case SCTP_PARAM_IPV6_ADDRESS:
2986 if (!asoc->peer.ipv6_address)
945e5abc 2987 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2988 break;
2989 case SCTP_PARAM_IPV4_ADDRESS:
2990 if (!asoc->peer.ipv4_address)
945e5abc 2991 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2992 break;
2993 default:
945e5abc 2994 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2995 }
2996
6a435732 2997 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
1da177e4 2998 if (unlikely(!af))
945e5abc 2999 return SCTP_ERROR_DNS_FAILED;
1da177e4 3000
dd86d136 3001 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
42e30bf3
VY		 3002
3003 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3004 * or multicast address.
3005 * (note: wildcard is permitted and requires special handling so
3006 * make sure we check for that)
3007 */
3008 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
945e5abc 3009 return SCTP_ERROR_DNS_FAILED;
42e30bf3 3010
1da177e4
LT		 3011 switch (asconf_param->param_hdr.type) {
3012 case SCTP_PARAM_ADD_IP:
42e30bf3
VY		 3013 /* Section 4.2.1:
3014 * If the address 0.0.0.0 or ::0 is provided, the source
3015 * address of the packet MUST be added.
3016 */
3017 if (af->is_any(&addr))
3018 memcpy(&addr, &asconf->source, sizeof(addr));
3019
1da177e4 3020 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 3021 * request and does not have the local resources to add this
3022 * new address to the association, it MUST return an Error
3023 * Cause TLV set to the new error code 'Operation Refused
3024 * Due to Resource Shortage'.
3025 */
1da177e4 3026
dd86d136 3027 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 3028 if (!peer)
3029 return SCTP_ERROR_RSRC_LOW;
3030
3031 /* Start the heartbeat timer. */
3032 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3033 sctp_transport_hold(peer);
6af29ccc 3034 asoc->new_transport = peer;
1da177e4
LT		 3035 break;
3036 case SCTP_PARAM_DEL_IP:
3037 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 3038 * last remaining IP address of a peer endpoint, the receiver
3039 * MUST send an Error Cause TLV with the error cause set to the
3040 * new error code 'Request to Delete Last Remaining IP Address'.
3041 */
42e30bf3 3042 if (asoc->peer.transport_count == 1)
1da177e4
LT		 3043 return SCTP_ERROR_DEL_LAST_IP;
3044
3045 /* ADDIP 4.3 D8) If a request is received to delete an IP
3046 * address which is also the source address of the IP packet
3047 * which contained the ASCONF chunk, the receiver MUST reject
3048 * this request. To reject the request the receiver MUST send
3049 * an Error Cause TLV set to the new error code 'Request to
3050 * Delete Source IP Address'
3051 */
b1364104 3052 if (sctp_cmp_addr_exact(&asconf->source, &addr))
1da177e4
LT		 3053 return SCTP_ERROR_DEL_SRC_IP;
3054
42e30bf3
VY		 3055 /* Section 4.2.2
3056 * If the address 0.0.0.0 or ::0 is provided, all
3057 * addresses of the peer except the source address of the
3058 * packet MUST be deleted.
3059 */
3060 if (af->is_any(&addr)) {
3061 sctp_assoc_set_primary(asoc, asconf->transport);
3062 sctp_assoc_del_nonprimary_peers(asoc,
3063 asconf->transport);
3064 } else
3065 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 3066 break;
3067 case SCTP_PARAM_SET_PRIMARY:
42e30bf3
VY		 3068 /* ADDIP Section 4.2.4
3069 * If the address 0.0.0.0 or ::0 is provided, the receiver
3070 * MAY mark the source address of the packet as its
3071 * primary.
3072 */
3073 if (af->is_any(&addr))
3074 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3075
dd86d136 3076 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4 3077 if (!peer)
945e5abc 3078 return SCTP_ERROR_DNS_FAILED;
1da177e4
LT		 3079
3080 sctp_assoc_set_primary(asoc, peer);
3081 break;
1da177e4
LT		 3082 }
3083
3084 return SCTP_ERROR_NO_ERROR;
3085}
3086
6f4c618d
WY		 3087/* Verify the ASCONF packet before we process it. */
3088int sctp_verify_asconf(const struct sctp_association *asoc,
3089 struct sctp_paramhdr *param_hdr, void *chunk_end,
3090 struct sctp_paramhdr **errp) {
3091 sctp_addip_param_t *asconf_param;
3092 union sctp_params param;
3093 int length, plen;
3094
3095 param.v = (sctp_paramhdr_t *) param_hdr;
3096 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3097 length = ntohs(param.p->length);
3098 *errp = param.p;
3099
3100 if (param.v > chunk_end - length ||
3101 length < sizeof(sctp_paramhdr_t))
3102 return 0;
3103
3104 switch (param.p->type) {
3105 case SCTP_PARAM_ADD_IP:
3106 case SCTP_PARAM_DEL_IP:
3107 case SCTP_PARAM_SET_PRIMARY:
3108 asconf_param = (sctp_addip_param_t *)param.v;
3109 plen = ntohs(asconf_param->param_hdr.length);
3110 if (plen < sizeof(sctp_addip_param_t) +
3111 sizeof(sctp_paramhdr_t))
3112 return 0;
3113 break;
3114 case SCTP_PARAM_SUCCESS_REPORT:
3115 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3116 if (length != sizeof(sctp_addip_param_t))
3117 return 0;
3118
3119 break;
3120 default:
3121 break;
3122 }
3123
3124 param.v += WORD_ROUND(length);
3125 }
3126
3127 if (param.v != chunk_end)
3128 return 0;
3129
3130 return 1;
3131}
3132
d808ad9a 3133/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 3134 * return an ASCONF_ACK chunk to be sent in response.
3135 */
3136struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3137 struct sctp_chunk *asconf)
3138{
3139 sctp_addiphdr_t *hdr;
3140 union sctp_addr_param *addr_param;
3141 sctp_addip_param_t *asconf_param;
3142 struct sctp_chunk *asconf_ack;
3143
dbc16db1 3144 __be16 err_code;
1da177e4 3145 int length = 0;
f3830ccc 3146 int chunk_len;
1da177e4
LT		 3147 __u32 serial;
3148 int all_param_pass = 1;
3149
f3830ccc 3150 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
1da177e4
LT		 3151 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3152 serial = ntohl(hdr->serial);
3153
d808ad9a 3154 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 3155 length = sizeof(sctp_addiphdr_t);
3156 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3157 chunk_len -= length;
3158
3159 /* Skip the address parameter and store a pointer to the first
7aa1b54b 3160 * asconf parameter.
d808ad9a 3161 */
6a435732 3162 length = ntohs(addr_param->p.length);
ea110733 3163 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3164 chunk_len -= length;
3165
d808ad9a 3166 /* create an ASCONF_ACK chunk.
1da177e4 3167 * Based on the definitions of parameters, we know that the size of
2cab86be 3168 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
7aa1b54b 3169 * parameters.
1da177e4 3170 */
2cab86be 3171 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
1da177e4
LT		 3172 if (!asconf_ack)
3173 goto done;
3174
3175 /* Process the TLVs contained within the ASCONF chunk. */
3176 while (chunk_len > 0) {
3177 err_code = sctp_process_asconf_param(asoc, asconf,
3178 asconf_param);
3179 /* ADDIP 4.1 A7)
3180 * If an error response is received for a TLV parameter,
3181 * all TLVs with no response before the failed TLV are
3182 * considered successful if not reported. All TLVs after
3183 * the failed response are considered unsuccessful unless
3184 * a specific success indication is present for the parameter.
3185 */
3186 if (SCTP_ERROR_NO_ERROR != err_code)
3187 all_param_pass = 0;
3188
3189 if (!all_param_pass)
3190 sctp_add_asconf_response(asconf_ack,
3191 asconf_param->crr_id, err_code,
3192 asconf_param);
3193
3194 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3195 * an IP address sends an 'Out of Resource' in its response, it
3196 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 3197 * in the ASCONF.
1da177e4
LT		 3198 */
3199 if (SCTP_ERROR_RSRC_LOW == err_code)
3200 goto done;
3201
3202 /* Move to the next ASCONF param. */
3203 length = ntohs(asconf_param->param_hdr.length);
ea110733 3204 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3205 chunk_len -= length;
3206 }
d808ad9a 3207
1da177e4
LT		 3208done:
3209 asoc->peer.addip_serial++;
3210
3211 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 3212 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 3213 */
3214 if (asconf_ack) {
1da177e4 3215 sctp_chunk_hold(asconf_ack);
a08de64d
VY		 3216 list_add_tail(&asconf_ack->transmitted_list,
3217 &asoc->asconf_ack_list);
1da177e4
LT		 3218 }
3219
3220 return asconf_ack;
3221}
3222
3223/* Process a asconf parameter that is successfully acked. */
425e0f68 3224static void sctp_asconf_param_success(struct sctp_association *asoc,
1da177e4
LT		 3225 sctp_addip_param_t *asconf_param)
3226{
3227 struct sctp_af *af;
3228 union sctp_addr addr;
3229 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3230 union sctp_addr_param *addr_param;
1da177e4 3231 struct sctp_transport *transport;
dc022a98 3232 struct sctp_sockaddr_entry *saddr;
1da177e4 3233
ea110733 3234 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
1da177e4
LT		 3235
3236 /* We have checked the packet before, so we do not check again. */
6a435732 3237 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
dd86d136 3238 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 3239
3240 switch (asconf_param->param_hdr.type) {
3241 case SCTP_PARAM_ADD_IP:
559cf710
VY		 3242 /* This is always done in BH context with a socket lock
3243 * held, so the list can not change.
3244 */
0ed90fb0 3245 local_bh_disable();
559cf710 3246 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 3247 if (sctp_cmp_addr_exact(&saddr->a, &addr))
f57d96b2 3248 saddr->state = SCTP_ADDR_SRC;
dc022a98 3249 }
0ed90fb0 3250 local_bh_enable();
3cd9749c
WY		 3251 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3252 transports) {
3cd9749c 3253 dst_release(transport->dst);
c6ef006b 3254 transport->dst = NULL;
3cd9749c 3255 }
1da177e4
LT		 3256 break;
3257 case SCTP_PARAM_DEL_IP:
0ed90fb0 3258 local_bh_disable();
425e0f68 3259 sctp_del_bind_addr(bp, &addr);
8a07eb0a
MH		 3260 if (asoc->asconf_addr_del_pending != NULL &&
3261 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3262 kfree(asoc->asconf_addr_del_pending);
3263 asoc->asconf_addr_del_pending = NULL;
3264 }
0ed90fb0 3265 local_bh_enable();
9dbc15f0
RD		 3266 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3267 transports) {
dc022a98 3268 dst_release(transport->dst);
c6ef006b 3269 transport->dst = NULL;
1da177e4
LT		 3270 }
3271 break;
3272 default:
3273 break;
3274 }
1da177e4
LT		 3275}
3276
3277/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3278 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 3279 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 3280 * ADDIP 4.1
3281 * A7) If an error response is received for a TLV parameter, all TLVs with no
3282 * response before the failed TLV are considered successful if not reported.
3283 * All TLVs after the failed response are considered unsuccessful unless a
3284 * specific success indication is present for the parameter.
3285 */
dbc16db1 3286static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 3287 sctp_addip_param_t *asconf_param,
3288 int no_err)
3289{
3290 sctp_addip_param_t *asconf_ack_param;
3291 sctp_errhdr_t *err_param;
3292 int length;
f3830ccc 3293 int asconf_ack_len;
dbc16db1 3294 __be16 err_code;
1da177e4
LT		 3295
3296 if (no_err)
3297 err_code = SCTP_ERROR_NO_ERROR;
3298 else
3299 err_code = SCTP_ERROR_REQ_REFUSED;
3300
f3830ccc
WY		 3301 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3302 sizeof(sctp_chunkhdr_t);
3303
1da177e4
LT		 3304 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3305 * the first asconf_ack parameter.
d808ad9a 3306 */
1da177e4
LT		 3307 length = sizeof(sctp_addiphdr_t);
3308 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3309 length);
3310 asconf_ack_len -= length;
3311
3312 while (asconf_ack_len > 0) {
3313 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3314 switch(asconf_ack_param->param_hdr.type) {
3315 case SCTP_PARAM_SUCCESS_REPORT:
3316 return SCTP_ERROR_NO_ERROR;
3317 case SCTP_PARAM_ERR_CAUSE:
3318 length = sizeof(sctp_addip_param_t);
ea110733 3319 err_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3320 asconf_ack_len -= length;
3321 if (asconf_ack_len > 0)
3322 return err_param->cause;
3323 else
3324 return SCTP_ERROR_INV_PARAM;
3325 break;
3326 default:
3327 return SCTP_ERROR_INV_PARAM;
3328 }
3329 }
3330
3331 length = ntohs(asconf_ack_param->param_hdr.length);
ea110733 3332 asconf_ack_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3333 asconf_ack_len -= length;
3334 }
3335
3336 return err_code;
3337}
3338
3339/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3340int sctp_process_asconf_ack(struct sctp_association *asoc,
3341 struct sctp_chunk *asconf_ack)
3342{
3343 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3344 union sctp_addr_param *addr_param;
3345 sctp_addip_param_t *asconf_param;
3346 int length = 0;
3347 int asconf_len = asconf->skb->len;
3348 int all_param_pass = 0;
3349 int no_err = 1;
3350 int retval = 0;
dbc16db1 3351 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3352
3353 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3354 * a pointer to address parameter.
d808ad9a 3355 */
1da177e4
LT		 3356 length = sizeof(sctp_addip_chunk_t);
3357 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3358 asconf_len -= length;
3359
3360 /* Skip the address parameter in the last asconf sent and store a
7aa1b54b 3361 * pointer to the first asconf parameter.
d808ad9a 3362 */
6a435732 3363 length = ntohs(addr_param->p.length);
ea110733 3364 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3365 asconf_len -= length;
3366
3367 /* ADDIP 4.1
3368 * A8) If there is no response(s) to specific TLV parameter(s), and no
3369 * failures are indicated, then all request(s) are considered
3370 * successful.
3371 */
3372 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3373 all_param_pass = 1;
3374
3375 /* Process the TLVs contained in the last sent ASCONF chunk. */
3376 while (asconf_len > 0) {
3377 if (all_param_pass)
3378 err_code = SCTP_ERROR_NO_ERROR;
3379 else {
3380 err_code = sctp_get_asconf_response(asconf_ack,
3381 asconf_param,
3382 no_err);
3383 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3384 no_err = 0;
3385 }
3386
3387 switch (err_code) {
3388 case SCTP_ERROR_NO_ERROR:
425e0f68 3389 sctp_asconf_param_success(asoc, asconf_param);
1da177e4
LT		 3390 break;
3391
3392 case SCTP_ERROR_RSRC_LOW:
3393 retval = 1;
3394 break;
3395
a987f762 3396 case SCTP_ERROR_UNKNOWN_PARAM:
1da177e4
LT		 3397 /* Disable sending this type of asconf parameter in
3398 * future.
d808ad9a 3399 */
1da177e4
LT		 3400 asoc->peer.addip_disabled_mask |=
3401 asconf_param->param_hdr.type;
3402 break;
3403
3404 case SCTP_ERROR_REQ_REFUSED:
3405 case SCTP_ERROR_DEL_LAST_IP:
3406 case SCTP_ERROR_DEL_SRC_IP:
3407 default:
3408 break;
3409 }
3410
3411 /* Skip the processed asconf parameter and move to the next
3412 * one.
d808ad9a 3413 */
1da177e4 3414 length = ntohs(asconf_param->param_hdr.length);
ea110733 3415 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3416 asconf_len -= length;
3417 }
3418
ddc4bbee 3419 if (no_err && asoc->src_out_of_asoc_ok) {
8a07eb0a 3420 asoc->src_out_of_asoc_ok = 0;
ddc4bbee
MH		 3421 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3422 }
8a07eb0a 3423
1da177e4 3424 /* Free the cached last sent asconf chunk. */
5f9646c3 3425 list_del_init(&asconf->transmitted_list);
1da177e4
LT		 3426 sctp_chunk_free(asconf);
3427 asoc->addip_last_asconf = NULL;
3428
1da177e4
LT		 3429 return retval;
3430}
3431
d808ad9a 3432/* Make a FWD TSN chunk. */
1da177e4
LT		 3433struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3434 __u32 new_cum_tsn, size_t nstreams,
3435 struct sctp_fwdtsn_skip *skiplist)
3436{
3437 struct sctp_chunk *retval = NULL;
d808ad9a 3438 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3439 struct sctp_fwdtsn_skip skip;
3440 size_t hint;
3441 int i;
3442
3443 hint = (nstreams + 1) * sizeof(__u32);
3444
1da177e4
LT		 3445 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3446
3447 if (!retval)
3448 return NULL;
3449
1da177e4
LT		 3450 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3451 retval->subh.fwdtsn_hdr =
3452 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3453
3454 for (i = 0; i < nstreams; i++) {
3455 skip.stream = skiplist[i].stream;
3456 skip.ssn = skiplist[i].ssn;
3457 sctp_addto_chunk(retval, sizeof(skip), &skip);
3458 }
3459
3460 return retval;
3461}
kernel source for telekom puls (alcatel/mediatek)