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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 */
db28aafa 135static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
5fa782c2
NH		 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 200{
e1fc3b14 201 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 202 sctp_inithdr_t init;
203 union sctp_params addrs;
204 size_t chunksize;
205 struct sctp_chunk *retval = NULL;
206 int num_types, addrs_len = 0;
207 struct sctp_sock *sp;
208 sctp_supported_addrs_param_t sat;
3dbe8656 209 __be16 types[2];
0f3fffd8 210 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 211 sctp_supported_ext_param_t ext_param;
212 int num_ext = 0;
213 __u8 extensions[3];
730fc3d0
VY		 214 sctp_paramhdr_t *auth_chunks = NULL,
215 *auth_hmacs = NULL;
1da177e4
LT		 216
217 /* RFC 2960 3.3.2 Initiation (INIT) (1)
218 *
219 * Note 1: The INIT chunks can contain multiple addresses that
220 * can be IPv4 and/or IPv6 in any combination.
221 */
222 retval = NULL;
223
224 /* Convert the provided bind address list to raw format. */
225 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
226
227 init.init_tag = htonl(asoc->c.my_vtag);
228 init.a_rwnd = htonl(asoc->rwnd);
229 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
230 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
231 init.initial_tsn = htonl(asoc->c.initial_tsn);
232
233 /* How many address types are needed? */
234 sp = sctp_sk(asoc->base.sk);
235 num_types = sp->pf->supported_addrs(sp, types);
236
a8170c35
WY		 237 chunksize = sizeof(init) + addrs_len;
238 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
1da177e4 239 chunksize += sizeof(ecap_param);
8ee4be37 240
e1fc3b14 241 if (net->sctp.prsctp_enable)
036b579b
VY		 242 chunksize += sizeof(prsctp_param);
243
131a47e3
VY		 244 /* ADDIP: Section 4.2.7:
245 * An implementation supporting this extension [ADDIP] MUST list
246 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
247 * INIT-ACK parameters.
131a47e3 248 */
e1fc3b14 249 if (net->sctp.addip_enable) {
131a47e3
VY		 250 extensions[num_ext] = SCTP_CID_ASCONF;
251 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
252 num_ext += 2;
253 }
254
6fc791ee 255 if (sp->adaptation_ind)
256 chunksize += sizeof(aiparam);
257
1da177e4
LT		 258 chunksize += vparam_len;
259
730fc3d0 260 /* Account for AUTH related parameters */
e1fc3b14 261 if (net->sctp.auth_enable) {
730fc3d0
VY		 262 /* Add random parameter length*/
263 chunksize += sizeof(asoc->c.auth_random);
264
265 /* Add HMACS parameter length if any were defined */
266 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
267 if (auth_hmacs->length)
a8170c35 268 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 269 else
270 auth_hmacs = NULL;
271
272 /* Add CHUNKS parameter length */
273 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
274 if (auth_chunks->length)
a8170c35 275 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0 276 else
9baffaa6 277 auth_chunks = NULL;
730fc3d0
VY		 278
279 extensions[num_ext] = SCTP_CID_AUTH;
280 num_ext += 1;
281 }
282
131a47e3
VY		 283 /* If we have any extensions to report, account for that */
284 if (num_ext)
a8170c35
WY		 285 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
286 num_ext);
131a47e3 287
1da177e4
LT		 288 /* RFC 2960 3.3.2 Initiation (INIT) (1)
289 *
290 * Note 3: An INIT chunk MUST NOT contain more than one Host
291 * Name address parameter. Moreover, the sender of the INIT
292 * MUST NOT combine any other address types with the Host Name
293 * address in the INIT. The receiver of INIT MUST ignore any
294 * other address types if the Host Name address parameter is
295 * present in the received INIT chunk.
296 *
297 * PLEASE DO NOT FIXME [This version does not support Host Name.]
298 */
299
300 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
301 if (!retval)
302 goto nodata;
303
304 retval->subh.init_hdr =
305 sctp_addto_chunk(retval, sizeof(init), &init);
306 retval->param_hdr.v =
307 sctp_addto_chunk(retval, addrs_len, addrs.v);
308
309 /* RFC 2960 3.3.2 Initiation (INIT) (1)
310 *
311 * Note 4: This parameter, when present, specifies all the
312 * address types the sending endpoint can support. The absence
313 * of this parameter indicates that the sending endpoint can
314 * support any address type.
315 */
316 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
317 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
318 sctp_addto_chunk(retval, sizeof(sat), &sat);
319 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
320
321 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3 322
7aa1b54b 323 /* Add the supported extensions parameter. Be nice and add this
131a47e3
VY		 324 * fist before addiding the parameters for the extensions themselves
325 */
326 if (num_ext) {
327 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
328 ext_param.param_hdr.length =
329 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
330 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
331 &ext_param);
8ee4be37 332 sctp_addto_param(retval, num_ext, extensions);
131a47e3
VY		 333 }
334
e1fc3b14 335 if (net->sctp.prsctp_enable)
1da177e4 336 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
131a47e3 337
6fc791ee 338 if (sp->adaptation_ind) {
339 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
340 aiparam.param_hdr.length = htons(sizeof(aiparam));
341 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
342 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
343 }
131a47e3 344
730fc3d0 345 /* Add SCTP-AUTH chunks to the parameter list */
e1fc3b14 346 if (net->sctp.auth_enable) {
730fc3d0
VY		 347 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
348 asoc->c.auth_random);
349 if (auth_hmacs)
350 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
351 auth_hmacs);
352 if (auth_chunks)
353 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
354 auth_chunks);
355 }
1da177e4 356nodata:
a51482bd 357 kfree(addrs.v);
1da177e4
LT		 358 return retval;
359}
360
361struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
362 const struct sctp_chunk *chunk,
dd0fc66f 363 gfp_t gfp, int unkparam_len)
1da177e4
LT		 364{
365 sctp_inithdr_t initack;
366 struct sctp_chunk *retval;
367 union sctp_params addrs;
6fc791ee 368 struct sctp_sock *sp;
1da177e4
LT		 369 int addrs_len;
370 sctp_cookie_param_t *cookie;
371 int cookie_len;
372 size_t chunksize;
0f3fffd8 373 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 374 sctp_supported_ext_param_t ext_param;
375 int num_ext = 0;
376 __u8 extensions[3];
730fc3d0
VY		 377 sctp_paramhdr_t *auth_chunks = NULL,
378 *auth_hmacs = NULL,
379 *auth_random = NULL;
1da177e4
LT		 380
381 retval = NULL;
382
383 /* Note: there may be no addresses to embed. */
384 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
385
386 initack.init_tag = htonl(asoc->c.my_vtag);
387 initack.a_rwnd = htonl(asoc->rwnd);
388 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
389 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
390 initack.initial_tsn = htonl(asoc->c.initial_tsn);
391
392 /* FIXME: We really ought to build the cookie right
393 * into the packet instead of allocating more fresh memory.
394 */
395 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
396 addrs.v, addrs_len);
397 if (!cookie)
398 goto nomem_cookie;
399
400 /* Calculate the total size of allocation, include the reserved
401 * space for reporting unknown parameters if it is specified.
402 */
6fc791ee 403 sp = sctp_sk(asoc->base.sk);
1da177e4
LT		 404 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
405
d808ad9a 406 /* Tell peer that we'll do ECN only if peer advertised such cap. */
1da177e4
LT		 407 if (asoc->peer.ecn_capable)
408 chunksize += sizeof(ecap_param);
409
5ffad5ac 410 if (asoc->peer.prsctp_capable)
036b579b
VY		 411 chunksize += sizeof(prsctp_param);
412
5ffad5ac 413 if (asoc->peer.asconf_capable) {
131a47e3
VY		 414 extensions[num_ext] = SCTP_CID_ASCONF;
415 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
416 num_ext += 2;
417 }
418
6fc791ee 419 if (sp->adaptation_ind)
420 chunksize += sizeof(aiparam);
1da177e4 421
730fc3d0
VY		 422 if (asoc->peer.auth_capable) {
423 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
424 chunksize += ntohs(auth_random->length);
425
426 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
427 if (auth_hmacs->length)
a8170c35 428 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 429 else
430 auth_hmacs = NULL;
431
432 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
433 if (auth_chunks->length)
a8170c35 434 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0
VY		 435 else
436 auth_chunks = NULL;
437
438 extensions[num_ext] = SCTP_CID_AUTH;
439 num_ext += 1;
440 }
441
8ee4be37 442 if (num_ext)
a8170c35
WY		 443 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
444 num_ext);
8ee4be37 445
1da177e4
LT		 446 /* Now allocate and fill out the chunk. */
447 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
448 if (!retval)
449 goto nomem_chunk;
450
b99a4d53
DC		 451 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
452 *
453 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
454 * HEARTBEAT ACK, * etc.) to the same destination transport
455 * address from which it received the DATA or control chunk
456 * to which it is replying.
457 *
458 * [INIT ACK back to where the INIT came from.]
1da177e4
LT		 459 */
460 retval->transport = chunk->transport;
b99a4d53 461
1da177e4
LT		 462 retval->subh.init_hdr =
463 sctp_addto_chunk(retval, sizeof(initack), &initack);
464 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
465 sctp_addto_chunk(retval, cookie_len, cookie);
466 if (asoc->peer.ecn_capable)
467 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3
VY		 468 if (num_ext) {
469 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
470 ext_param.param_hdr.length =
471 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
472 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
473 &ext_param);
8ee4be37 474 sctp_addto_param(retval, num_ext, extensions);
131a47e3 475 }
1da177e4
LT		 476 if (asoc->peer.prsctp_capable)
477 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
478
6fc791ee 479 if (sp->adaptation_ind) {
480 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
481 aiparam.param_hdr.length = htons(sizeof(aiparam));
482 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
483 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
484 }
1da177e4 485
730fc3d0
VY		 486 if (asoc->peer.auth_capable) {
487 sctp_addto_chunk(retval, ntohs(auth_random->length),
488 auth_random);
489 if (auth_hmacs)
490 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
491 auth_hmacs);
492 if (auth_chunks)
493 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
494 auth_chunks);
495 }
496
1da177e4
LT		 497 /* We need to remove the const qualifier at this point. */
498 retval->asoc = (struct sctp_association *) asoc;
499
1da177e4
LT		 500nomem_chunk:
501 kfree(cookie);
502nomem_cookie:
a51482bd 503 kfree(addrs.v);
1da177e4
LT		 504 return retval;
505}
506
507/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
508 *
509 * This chunk is used only during the initialization of an association.
510 * It is sent by the initiator of an association to its peer to complete
511 * the initialization process. This chunk MUST precede any DATA chunk
512 * sent within the association, but MAY be bundled with one or more DATA
513 * chunks in the same packet.
514 *
515 * 0 1 2 3
516 * 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
517 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
518 * | Type = 10 |Chunk Flags | Length |
519 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
520 * / Cookie /
521 * \ \
522 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
523 *
524 * Chunk Flags: 8 bit
525 *
526 * Set to zero on transmit and ignored on receipt.
527 *
528 * Length: 16 bits (unsigned integer)
529 *
530 * Set to the size of the chunk in bytes, including the 4 bytes of
531 * the chunk header and the size of the Cookie.
532 *
533 * Cookie: variable size
534 *
535 * This field must contain the exact cookie received in the
536 * State Cookie parameter from the previous INIT ACK.
537 *
538 * An implementation SHOULD make the cookie as small as possible
539 * to insure interoperability.
540 */
541struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
542 const struct sctp_chunk *chunk)
543{
544 struct sctp_chunk *retval;
545 void *cookie;
546 int cookie_len;
547
548 cookie = asoc->peer.cookie;
549 cookie_len = asoc->peer.cookie_len;
550
551 /* Build a cookie echo chunk. */
552 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
553 if (!retval)
554 goto nodata;
555 retval->subh.cookie_hdr =
556 sctp_addto_chunk(retval, cookie_len, cookie);
557
558 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
559 *
560 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
561 * HEARTBEAT ACK, * etc.) to the same destination transport
562 * address from which it * received the DATA or control chunk
563 * to which it is replying.
564 *
565 * [COOKIE ECHO back to where the INIT ACK came from.]
566 */
567 if (chunk)
568 retval->transport = chunk->transport;
569
570nodata:
571 return retval;
572}
573
574/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
575 *
576 * This chunk is used only during the initialization of an
577 * association. It is used to acknowledge the receipt of a COOKIE
578 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
579 * within the association, but MAY be bundled with one or more DATA
580 * chunks or SACK chunk in the same SCTP packet.
581 *
582 * 0 1 2 3
583 * 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
584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
585 * | Type = 11 |Chunk Flags | Length = 4 |
586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
587 *
588 * Chunk Flags: 8 bits
589 *
590 * Set to zero on transmit and ignored on receipt.
591 */
592struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
593 const struct sctp_chunk *chunk)
594{
595 struct sctp_chunk *retval;
596
597 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
598
599 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
600 *
601 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
602 * HEARTBEAT ACK, * etc.) to the same destination transport
603 * address from which it * received the DATA or control chunk
604 * to which it is replying.
605 *
606 * [COOKIE ACK back to where the COOKIE ECHO came from.]
607 */
608 if (retval && chunk)
609 retval->transport = chunk->transport;
610
611 return retval;
612}
613
614/*
615 * Appendix A: Explicit Congestion Notification:
616 * CWR:
617 *
618 * RFC 2481 details a specific bit for a sender to send in the header of
619 * its next outbound TCP segment to indicate to its peer that it has
620 * reduced its congestion window. This is termed the CWR bit. For
621 * SCTP the same indication is made by including the CWR chunk.
622 * This chunk contains one data element, i.e. the TSN number that
623 * was sent in the ECNE chunk. This element represents the lowest
624 * TSN number in the datagram that was originally marked with the
625 * CE bit.
626 *
627 * 0 1 2 3
628 * 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
629 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
630 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
631 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
632 * | Lowest TSN Number |
633 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
634 *
635 * Note: The CWR is considered a Control chunk.
636 */
637struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
638 const __u32 lowest_tsn,
639 const struct sctp_chunk *chunk)
640{
641 struct sctp_chunk *retval;
642 sctp_cwrhdr_t cwr;
643
644 cwr.lowest_tsn = htonl(lowest_tsn);
645 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
646 sizeof(sctp_cwrhdr_t));
647
648 if (!retval)
649 goto nodata;
650
651 retval->subh.ecn_cwr_hdr =
652 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
653
654 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
655 *
656 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
657 * HEARTBEAT ACK, * etc.) to the same destination transport
658 * address from which it * received the DATA or control chunk
659 * to which it is replying.
660 *
661 * [Report a reduced congestion window back to where the ECNE
662 * came from.]
663 */
664 if (chunk)
665 retval->transport = chunk->transport;
666
667nodata:
668 return retval;
669}
670
671/* Make an ECNE chunk. This is a congestion experienced report. */
672struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
673 const __u32 lowest_tsn)
674{
675 struct sctp_chunk *retval;
676 sctp_ecnehdr_t ecne;
677
678 ecne.lowest_tsn = htonl(lowest_tsn);
679 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
680 sizeof(sctp_ecnehdr_t));
681 if (!retval)
682 goto nodata;
683 retval->subh.ecne_hdr =
684 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
685
686nodata:
687 return retval;
688}
689
690/* Make a DATA chunk for the given association from the provided
691 * parameters. However, do not populate the data payload.
692 */
693struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
694 const struct sctp_sndrcvinfo *sinfo,
695 int data_len, __u8 flags, __u16 ssn)
696{
697 struct sctp_chunk *retval;
698 struct sctp_datahdr dp;
699 int chunk_len;
700
701 /* We assign the TSN as LATE as possible, not here when
702 * creating the chunk.
703 */
704 dp.tsn = 0;
705 dp.stream = htons(sinfo->sinfo_stream);
706 dp.ppid = sinfo->sinfo_ppid;
707
708 /* Set the flags for an unordered send. */
eaa5c54d 709 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
1da177e4
LT		 710 flags |= SCTP_DATA_UNORDERED;
711 dp.ssn = 0;
712 } else
713 dp.ssn = htons(ssn);
714
715 chunk_len = sizeof(dp) + data_len;
716 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
717 if (!retval)
718 goto nodata;
719
720 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
721 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
722
723nodata:
724 return retval;
725}
726
727/* Create a selective ackowledgement (SACK) for the given
728 * association. This reports on which TSN's we've seen to date,
729 * including duplicates and gaps.
730 */
731struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
732{
733 struct sctp_chunk *retval;
734 struct sctp_sackhdr sack;
735 int len;
736 __u32 ctsn;
737 __u16 num_gabs, num_dup_tsns;
4244854d 738 struct sctp_association *aptr = (struct sctp_association *)asoc;
1da177e4 739 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
02015180 740 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
4244854d 741 struct sctp_transport *trans;
1da177e4 742
02015180 743 memset(gabs, 0, sizeof(gabs));
1da177e4
LT		 744 ctsn = sctp_tsnmap_get_ctsn(map);
745 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
746
747 /* How much room is needed in the chunk? */
02015180 748 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
1da177e4
LT		 749 num_dup_tsns = sctp_tsnmap_num_dups(map);
750
751 /* Initialize the SACK header. */
752 sack.cum_tsn_ack = htonl(ctsn);
753 sack.a_rwnd = htonl(asoc->a_rwnd);
754 sack.num_gap_ack_blocks = htons(num_gabs);
755 sack.num_dup_tsns = htons(num_dup_tsns);
756
757 len = sizeof(sack)
758 + sizeof(struct sctp_gap_ack_block) * num_gabs
759 + sizeof(__u32) * num_dup_tsns;
760
761 /* Create the chunk. */
762 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
763 if (!retval)
764 goto nodata;
765
766 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
767 *
768 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
769 * HEARTBEAT ACK, etc.) to the same destination transport
770 * address from which it received the DATA or control chunk to
771 * which it is replying. This rule should also be followed if
772 * the endpoint is bundling DATA chunks together with the
773 * reply chunk.
774 *
775 * However, when acknowledging multiple DATA chunks received
776 * in packets from different source addresses in a single
777 * SACK, the SACK chunk may be transmitted to one of the
778 * destination transport addresses from which the DATA or
779 * control chunks being acknowledged were received.
780 *
781 * [BUG: We do not implement the following paragraph.
782 * Perhaps we should remember the last transport we used for a
783 * SACK and avoid that (if possible) if we have seen any
784 * duplicates. --piggy]
785 *
786 * When a receiver of a duplicate DATA chunk sends a SACK to a
787 * multi- homed endpoint it MAY be beneficial to vary the
788 * destination address and not use the source address of the
789 * DATA chunk. The reason being that receiving a duplicate
790 * from a multi-homed endpoint might indicate that the return
791 * path (as specified in the source address of the DATA chunk)
792 * for the SACK is broken.
793 *
794 * [Send to the address from which we last received a DATA chunk.]
795 */
796 retval->transport = asoc->peer.last_data_from;
797
798 retval->subh.sack_hdr =
799 sctp_addto_chunk(retval, sizeof(sack), &sack);
800
801 /* Add the gap ack block information. */
802 if (num_gabs)
803 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
02015180 804 gabs);
1da177e4
LT		 805
806 /* Add the duplicate TSN information. */
807 if (num_dup_tsns)
808 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
809 sctp_tsnmap_get_dups(map));
810
4244854d
NH		 811 /* Once we have a sack generated, check to see what our sack
812 * generation is, if its 0, reset the transports to 0, and reset
813 * the association generation to 1
814 *
815 * The idea is that zero is never used as a valid generation for the
816 * association so no transport will match after a wrap event like this,
817 * Until the next sack
818 */
819 if (++aptr->peer.sack_generation == 0) {
820 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
821 transports)
822 trans->sack_generation = 0;
823 aptr->peer.sack_generation = 1;
824 }
1da177e4
LT		 825nodata:
826 return retval;
827}
828
829/* Make a SHUTDOWN chunk. */
830struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
831 const struct sctp_chunk *chunk)
832{
833 struct sctp_chunk *retval;
834 sctp_shutdownhdr_t shut;
835 __u32 ctsn;
836
837 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
838 shut.cum_tsn_ack = htonl(ctsn);
839
840 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
841 sizeof(sctp_shutdownhdr_t));
842 if (!retval)
843 goto nodata;
844
845 retval->subh.shutdown_hdr =
846 sctp_addto_chunk(retval, sizeof(shut), &shut);
847
848 if (chunk)
849 retval->transport = chunk->transport;
850nodata:
851 return retval;
852}
853
854struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
856{
857 struct sctp_chunk *retval;
858
859 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
860
861 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
862 *
863 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
864 * HEARTBEAT ACK, * etc.) to the same destination transport
865 * address from which it * received the DATA or control chunk
866 * to which it is replying.
867 *
868 * [ACK back to where the SHUTDOWN came from.]
869 */
870 if (retval && chunk)
871 retval->transport = chunk->transport;
872
873 return retval;
874}
875
876struct sctp_chunk *sctp_make_shutdown_complete(
877 const struct sctp_association *asoc,
878 const struct sctp_chunk *chunk)
879{
880 struct sctp_chunk *retval;
881 __u8 flags = 0;
882
047a2428
JF		 883 /* Set the T-bit if we have no association (vtag will be
884 * reflected)
885 */
1da177e4
LT		 886 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
887
888 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
889
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
891 *
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
896 *
897 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
898 * came from.]
899 */
900 if (retval && chunk)
901 retval->transport = chunk->transport;
902
d808ad9a 903 return retval;
1da177e4
LT		 904}
905
906/* Create an ABORT. Note that we set the T bit if we have no
047a2428 907 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 908 */
909struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
910 const struct sctp_chunk *chunk,
911 const size_t hint)
912{
913 struct sctp_chunk *retval;
914 __u8 flags = 0;
915
047a2428
JF		 916 /* Set the T-bit if we have no association and 'chunk' is not
917 * an INIT (vtag will be reflected).
918 */
919 if (!asoc) {
920 if (chunk && chunk->chunk_hdr &&
921 chunk->chunk_hdr->type == SCTP_CID_INIT)
922 flags = 0;
923 else
924 flags = SCTP_CHUNK_FLAG_T;
925 }
1da177e4
LT		 926
927 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
928
929 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
930 *
931 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
932 * HEARTBEAT ACK, * etc.) to the same destination transport
933 * address from which it * received the DATA or control chunk
934 * to which it is replying.
935 *
936 * [ABORT back to where the offender came from.]
937 */
938 if (retval && chunk)
939 retval->transport = chunk->transport;
940
941 return retval;
942}
943
944/* Helper to create ABORT with a NO_USER_DATA error. */
945struct sctp_chunk *sctp_make_abort_no_data(
946 const struct sctp_association *asoc,
947 const struct sctp_chunk *chunk, __u32 tsn)
948{
949 struct sctp_chunk *retval;
9f81bcd9 950 __be32 payload;
1da177e4
LT		 951
952 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
953 + sizeof(tsn));
954
955 if (!retval)
956 goto no_mem;
957
958 /* Put the tsn back into network byte order. */
959 payload = htonl(tsn);
00f1c2df
WY		 960 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
961 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 962
963 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
964 *
965 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
966 * HEARTBEAT ACK, * etc.) to the same destination transport
967 * address from which it * received the DATA or control chunk
968 * to which it is replying.
969 *
970 * [ABORT back to where the offender came from.]
971 */
972 if (chunk)
973 retval->transport = chunk->transport;
974
975no_mem:
976 return retval;
977}
978
979/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
980struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 981 const struct msghdr *msg,
982 size_t paylen)
1da177e4
LT		 983{
984 struct sctp_chunk *retval;
c164a9ba
SS		 985 void *payload = NULL;
986 int err;
1da177e4 987
c164a9ba 988 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 989 if (!retval)
990 goto err_chunk;
991
992 if (paylen) {
993 /* Put the msg_iov together into payload. */
c164a9ba 994 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 995 if (!payload)
996 goto err_payload;
c164a9ba
SS		 997
998 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
999 if (err < 0)
1000 goto err_copy;
1da177e4
LT		 1001 }
1002
00f1c2df
WY		 1003 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1004 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 1005
1006 if (paylen)
1007 kfree(payload);
1008
1009 return retval;
1010
1011err_copy:
1012 kfree(payload);
1013err_payload:
1014 sctp_chunk_free(retval);
1015 retval = NULL;
1016err_chunk:
1017 return retval;
1018}
1019
5c94bf86
AB		 1020/* Append bytes to the end of a parameter. Will panic if chunk is not big
1021 * enough.
1022 */
1023static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1024 const void *data)
1025{
1026 void *target;
1027 int chunklen = ntohs(chunk->chunk_hdr->length);
1028
1029 target = skb_put(chunk->skb, len);
1030
6383cfb3
VY		 1031 if (data)
1032 memcpy(target, data, len);
1033 else
1034 memset(target, 0, len);
5c94bf86
AB		 1035
1036 /* Adjust the chunk length field. */
1037 chunk->chunk_hdr->length = htons(chunklen + len);
1038 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1039
1040 return target;
1041}
1042
d808ad9a 1043/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 1044struct sctp_chunk *sctp_make_abort_violation(
1045 const struct sctp_association *asoc,
1046 const struct sctp_chunk *chunk,
1047 const __u8 *payload,
1048 const size_t paylen)
1049{
1050 struct sctp_chunk *retval;
1051 struct sctp_paramhdr phdr;
1052
1053 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1054 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1055 if (!retval)
1056 goto end;
1057
00f1c2df
WY		 1058 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1059 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1060
1061 phdr.type = htons(chunk->chunk_hdr->type);
1062 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1063 sctp_addto_chunk(retval, paylen, payload);
1064 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1065
1066end:
1067 return retval;
1068}
1069
ba016670
WY		 1070struct sctp_chunk *sctp_make_violation_paramlen(
1071 const struct sctp_association *asoc,
1072 const struct sctp_chunk *chunk,
1073 struct sctp_paramhdr *param)
1074{
1075 struct sctp_chunk *retval;
1076 static const char error[] = "The following parameter had invalid length:";
1077 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1078 sizeof(sctp_paramhdr_t);
1079
1080 retval = sctp_make_abort(asoc, chunk, payload_len);
1081 if (!retval)
1082 goto nodata;
1083
1084 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1085 sizeof(error) + sizeof(sctp_paramhdr_t));
1086 sctp_addto_chunk(retval, sizeof(error), error);
1087 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1088
1089nodata:
1090 return retval;
1091}
1092
de4594a5
NH		 1093struct sctp_chunk *sctp_make_violation_max_retrans(
1094 const struct sctp_association *asoc,
1095 const struct sctp_chunk *chunk)
1096{
1097 struct sctp_chunk *retval;
1098 static const char error[] = "Association exceeded its max_retans count";
1099 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1100
1101 retval = sctp_make_abort(asoc, chunk, payload_len);
1102 if (!retval)
1103 goto nodata;
1104
1105 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1106 sctp_addto_chunk(retval, sizeof(error), error);
1107
1108nodata:
1109 return retval;
1110}
1111
1da177e4
LT		 1112/* Make a HEARTBEAT chunk. */
1113struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
92c73af5 1114 const struct sctp_transport *transport)
1da177e4 1115{
92c73af5
WY		 1116 struct sctp_chunk *retval;
1117 sctp_sender_hb_info_t hbinfo;
1118
1119 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
1da177e4
LT		 1120
1121 if (!retval)
1122 goto nodata;
1123
92c73af5
WY		 1124 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1125 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1126 hbinfo.daddr = transport->ipaddr;
1127 hbinfo.sent_at = jiffies;
1128 hbinfo.hb_nonce = transport->hb_nonce;
1129
1da177e4
LT		 1130 /* Cast away the 'const', as this is just telling the chunk
1131 * what transport it belongs to.
1132 */
1133 retval->transport = (struct sctp_transport *) transport;
92c73af5
WY		 1134 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1135 &hbinfo);
1da177e4
LT		 1136
1137nodata:
1138 return retval;
1139}
1140
1141struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1142 const struct sctp_chunk *chunk,
1143 const void *payload, const size_t paylen)
1144{
1145 struct sctp_chunk *retval;
1146
1147 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1148 if (!retval)
1149 goto nodata;
1150
1151 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1152
1153 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1154 *
1155 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1156 * HEARTBEAT ACK, * etc.) to the same destination transport
1157 * address from which it * received the DATA or control chunk
1158 * to which it is replying.
1159 *
1160 * [HBACK back to where the HEARTBEAT came from.]
1161 */
1162 if (chunk)
1163 retval->transport = chunk->transport;
1164
1165nodata:
1166 return retval;
1167}
1168
1169/* Create an Operation Error chunk with the specified space reserved.
1170 * This routine can be used for containing multiple causes in the chunk.
1171 */
1172static struct sctp_chunk *sctp_make_op_error_space(
1173 const struct sctp_association *asoc,
1174 const struct sctp_chunk *chunk,
1175 size_t size)
1176{
1177 struct sctp_chunk *retval;
1178
1179 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1180 sizeof(sctp_errhdr_t) + size);
1181 if (!retval)
1182 goto nodata;
1183
1184 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1185 *
1186 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1187 * HEARTBEAT ACK, etc.) to the same destination transport
1188 * address from which it received the DATA or control chunk
1189 * to which it is replying.
1190 *
1191 */
1192 if (chunk)
1193 retval->transport = chunk->transport;
1194
1195nodata:
1196 return retval;
1197}
1198
5fa782c2
NH		 1199/* Create an Operation Error chunk of a fixed size,
1200 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1201 * This is a helper function to allocate an error chunk for
1202 * for those invalid parameter codes in which we may not want
1203 * to report all the errors, if the incomming chunk is large
1204 */
1205static inline struct sctp_chunk *sctp_make_op_error_fixed(
1206 const struct sctp_association *asoc,
1207 const struct sctp_chunk *chunk)
1208{
1209 size_t size = asoc ? asoc->pathmtu : 0;
1210
1211 if (!size)
1212 size = SCTP_DEFAULT_MAXSEGMENT;
1213
1214 return sctp_make_op_error_space(asoc, chunk, size);
1215}
1216
1da177e4
LT		 1217/* Create an Operation Error chunk. */
1218struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1219 const struct sctp_chunk *chunk,
63706c5c 1220 __be16 cause_code, const void *payload,
6383cfb3 1221 size_t paylen, size_t reserve_tail)
1da177e4
LT		 1222{
1223 struct sctp_chunk *retval;
1224
6383cfb3 1225 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1da177e4
LT		 1226 if (!retval)
1227 goto nodata;
1228
6383cfb3 1229 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
00f1c2df 1230 sctp_addto_chunk(retval, paylen, payload);
6383cfb3
VY		 1231 if (reserve_tail)
1232 sctp_addto_param(retval, reserve_tail, NULL);
1da177e4
LT		 1233
1234nodata:
1235 return retval;
1236}
1237
4cd57c80
VY		 1238struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1239{
1240 struct sctp_chunk *retval;
1241 struct sctp_hmac *hmac_desc;
1242 struct sctp_authhdr auth_hdr;
1243 __u8 *hmac;
1244
1245 /* Get the first hmac that the peer told us to use */
1246 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1247 if (unlikely(!hmac_desc))
1248 return NULL;
1249
1250 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1251 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1252 if (!retval)
1253 return NULL;
1254
1255 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1256 auth_hdr.shkey_id = htons(asoc->active_key_id);
1257
1258 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1259 &auth_hdr);
1260
1261 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1262 memset(hmac, 0, hmac_desc->hmac_len);
1263
1264 /* Adjust the chunk header to include the empty MAC */
1265 retval->chunk_hdr->length =
1266 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1267 retval->chunk_end = skb_tail_pointer(retval->skb);
1268
1269 return retval;
1270}
1271
1272
1da177e4
LT		 1273/********************************************************************
1274 * 2nd Level Abstractions
1275 ********************************************************************/
1276
1277/* Turn an skb into a chunk.
1278 * FIXME: Eventually move the structure directly inside the skb->cb[].
1279 */
1280struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1281 const struct sctp_association *asoc,
1282 struct sock *sk)
1283{
1284 struct sctp_chunk *retval;
1285
c3762229 1286 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1287
1288 if (!retval)
1289 goto nodata;
1da177e4
LT		 1290
1291 if (!sk) {
1292 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1293 }
1294
79af02c2 1295 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1296 retval->skb = skb;
1297 retval->asoc = (struct sctp_association *)asoc;
1da177e4
LT		 1298 retval->has_tsn = 0;
1299 retval->has_ssn = 0;
1300 retval->rtt_in_progress = 0;
1301 retval->sent_at = 0;
1302 retval->singleton = 1;
1303 retval->end_of_packet = 0;
1304 retval->ecn_ce_done = 0;
1305 retval->pdiscard = 0;
1306
1307 /* sctpimpguide-05.txt Section 2.8.2
1308 * M1) Each time a new DATA chunk is transmitted
1309 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1310 * 'TSN.Missing.Report' count will be used to determine missing chunks
1311 * and when to fast retransmit.
1312 */
1313 retval->tsn_missing_report = 0;
1314 retval->tsn_gap_acked = 0;
c226ef9b 1315 retval->fast_retransmit = SCTP_CAN_FRTX;
1da177e4
LT		 1316
1317 /* If this is a fragmented message, track all fragments
1318 * of the message (for SEND_FAILED).
1319 */
1320 retval->msg = NULL;
1321
1322 /* Polish the bead hole. */
1323 INIT_LIST_HEAD(&retval->transmitted_list);
1324 INIT_LIST_HEAD(&retval->frag_list);
1325 SCTP_DBG_OBJCNT_INC(chunk);
1326 atomic_set(&retval->refcnt, 1);
1327
1328nodata:
1329 return retval;
1330}
1331
1332/* Set chunk->source and dest based on the IP header in chunk->skb. */
1333void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1334 union sctp_addr *dest)
1335{
f235fca3 1336 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1337 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1338}
1339
1340/* Extract the source address from a chunk. */
1341const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1342{
1343 /* If we have a known transport, use that. */
1344 if (chunk->transport) {
6a1e5f33 1345 return &chunk->transport->ipaddr;
1da177e4
LT		 1346 } else {
1347 /* Otherwise, extract it from the IP header. */
6a1e5f33 1348 return &chunk->source;
1da177e4
LT		 1349 }
1350}
1351
1352/* Create a new chunk, setting the type and flags headers from the
1353 * arguments, reserving enough space for a 'paylen' byte payload.
1354 */
1355SCTP_STATIC
1356struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1357 __u8 type, __u8 flags, int paylen)
1358{
1359 struct sctp_chunk *retval;
1360 sctp_chunkhdr_t *chunk_hdr;
1361 struct sk_buff *skb;
1362 struct sock *sk;
1363
1364 /* No need to allocate LL here, as this is only a chunk. */
1365 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1366 GFP_ATOMIC);
1367 if (!skb)
1368 goto nodata;
1369
1370 /* Make room for the chunk header. */
1371 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1372 chunk_hdr->type = type;
1373 chunk_hdr->flags = flags;
1374 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1375
1376 sk = asoc ? asoc->base.sk : NULL;
1377 retval = sctp_chunkify(skb, asoc, sk);
1378 if (!retval) {
1379 kfree_skb(skb);
1380 goto nodata;
1381 }
1382
1383 retval->chunk_hdr = chunk_hdr;
1384 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1385
4cd57c80
VY		 1386 /* Determine if the chunk needs to be authenticated */
1387 if (sctp_auth_send_cid(type, asoc))
1388 retval->auth = 1;
1389
1da177e4
LT		 1390 /* Set the skb to the belonging sock for accounting. */
1391 skb->sk = sk;
1392
1393 return retval;
1394nodata:
1395 return NULL;
1396}
1397
1398
1399/* Release the memory occupied by a chunk. */
1400static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1401{
a08de64d
VY		 1402 BUG_ON(!list_empty(&chunk->list));
1403 list_del_init(&chunk->transmitted_list);
1404
1da177e4
LT		 1405 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1406 dev_kfree_skb(chunk->skb);
1407
1408 SCTP_DBG_OBJCNT_DEC(chunk);
1409 kmem_cache_free(sctp_chunk_cachep, chunk);
1410}
1411
1412/* Possibly, free the chunk. */
1413void sctp_chunk_free(struct sctp_chunk *chunk)
1414{
1da177e4
LT		 1415 /* Release our reference on the message tracker. */
1416 if (chunk->msg)
1417 sctp_datamsg_put(chunk->msg);
1418
1419 sctp_chunk_put(chunk);
1420}
1421
1422/* Grab a reference to the chunk. */
1423void sctp_chunk_hold(struct sctp_chunk *ch)
1424{
1425 atomic_inc(&ch->refcnt);
1426}
1427
1428/* Release a reference to the chunk. */
1429void sctp_chunk_put(struct sctp_chunk *ch)
1430{
1431 if (atomic_dec_and_test(&ch->refcnt))
1432 sctp_chunk_destroy(ch);
1433}
1434
1435/* Append bytes to the end of a chunk. Will panic if chunk is not big
1436 * enough.
1437 */
1438void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1439{
1440 void *target;
1441 void *padding;
1442 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1443 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1444
1445 padding = skb_put(chunk->skb, padlen);
1446 target = skb_put(chunk->skb, len);
1447
1448 memset(padding, 0, padlen);
1449 memcpy(target, data, len);
1450
1451 /* Adjust the chunk length field. */
1452 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1453 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1454
1455 return target;
1456}
1457
5fa782c2
NH		 1458/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1459 * space in the chunk
1460 */
1461void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1462 int len, const void *data)
1463{
2e3219b5 1464 if (skb_tailroom(chunk->skb) >= len)
5fa782c2
NH		 1465 return sctp_addto_chunk(chunk, len, data);
1466 else
1467 return NULL;
1468}
1469
1da177e4
LT		 1470/* Append bytes from user space to the end of a chunk. Will panic if
1471 * chunk is not big enough.
1472 * Returns a kernel err value.
1473 */
1474int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1475 struct iovec *data)
1476{
1477 __u8 *target;
1478 int err = 0;
1479
1480 /* Make room in chunk for data. */
1481 target = skb_put(chunk->skb, len);
1482
1483 /* Copy data (whole iovec) into chunk */
1484 if ((err = memcpy_fromiovecend(target, data, off, len)))
1485 goto out;
1486
1487 /* Adjust the chunk length field. */
1488 chunk->chunk_hdr->length =
1489 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1490 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1491
1492out:
1493 return err;
1494}
1495
1496/* Helper function to assign a TSN if needed. This assumes that both
1497 * the data_hdr and association have already been assigned.
1498 */
1499void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1500{
ab3e5e7b
VY		 1501 struct sctp_datamsg *msg;
1502 struct sctp_chunk *lchunk;
1503 struct sctp_stream *stream;
1da177e4
LT		 1504 __u16 ssn;
1505 __u16 sid;
1506
1507 if (chunk->has_ssn)
1508 return;
1509
ab3e5e7b
VY		 1510 /* All fragments will be on the same stream */
1511 sid = ntohs(chunk->subh.data_hdr->stream);
1512 stream = &chunk->asoc->ssnmap->out;
1da177e4 1513
ab3e5e7b
VY		 1514 /* Now assign the sequence number to the entire message.
1515 * All fragments must have the same stream sequence number.
1516 */
1517 msg = chunk->msg;
1518 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1519 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1520 ssn = 0;
1521 } else {
1522 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1523 ssn = sctp_ssn_next(stream, sid);
1524 else
1525 ssn = sctp_ssn_peek(stream, sid);
1526 }
1527
1528 lchunk->subh.data_hdr->ssn = htons(ssn);
1529 lchunk->has_ssn = 1;
1530 }
1da177e4
LT		 1531}
1532
1533/* Helper function to assign a TSN if needed. This assumes that both
1534 * the data_hdr and association have already been assigned.
1535 */
1536void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1537{
1538 if (!chunk->has_tsn) {
1539 /* This is the last possible instant to
1540 * assign a TSN.
1541 */
1542 chunk->subh.data_hdr->tsn =
1543 htonl(sctp_association_get_next_tsn(chunk->asoc));
1544 chunk->has_tsn = 1;
1545 }
1546}
1547
1548/* Create a CLOSED association to use with an incoming packet. */
1549struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1550 struct sctp_chunk *chunk,
dd0fc66f 1551 gfp_t gfp)
1da177e4
LT		 1552{
1553 struct sctp_association *asoc;
1554 struct sk_buff *skb;
1555 sctp_scope_t scope;
1556 struct sctp_af *af;
1557
1558 /* Create the bare association. */
1559 scope = sctp_scope(sctp_source(chunk));
1560 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1561 if (!asoc)
1562 goto nodata;
1563 asoc->temp = 1;
1564 skb = chunk->skb;
1565 /* Create an entry for the source address of the packet. */
eddc9ec5 1566 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1567 if (unlikely(!af))
1568 goto fail;
d55c41b1 1569 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1570nodata:
1571 return asoc;
1572
1573fail:
1574 sctp_association_free(asoc);
1575 return NULL;
1576}
1577
1578/* Build a cookie representing asoc.
1579 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1580 */
1581static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1582 const struct sctp_association *asoc,
1583 const struct sctp_chunk *init_chunk,
1584 int *cookie_len,
1585 const __u8 *raw_addrs, int addrs_len)
1586{
1587 sctp_cookie_param_t *retval;
1588 struct sctp_signed_cookie *cookie;
1589 struct scatterlist sg;
1590 int headersize, bodysize;
1591 unsigned int keylen;
1592 char *key;
1593
9834a2bb
VY		 1594 /* Header size is static data prior to the actual cookie, including
1595 * any padding.
1596 */
d808ad9a
YH		 1597 headersize = sizeof(sctp_paramhdr_t) +
1598 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1599 sizeof(struct sctp_cookie));
1da177e4
LT		 1600 bodysize = sizeof(struct sctp_cookie)
1601 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1602
1603 /* Pad out the cookie to a multiple to make the signature
1604 * functions simpler to write.
1605 */
1606 if (bodysize % SCTP_COOKIE_MULTIPLE)
1607 bodysize += SCTP_COOKIE_MULTIPLE
1608 - (bodysize % SCTP_COOKIE_MULTIPLE);
1609 *cookie_len = headersize + bodysize;
1610
1da177e4
LT		 1611 /* Clear this memory since we are sending this data structure
1612 * out on the network.
1613 */
af997d8c
ACM		 1614 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1615 if (!retval)
1616 goto nodata;
1617
1da177e4
LT		 1618 cookie = (struct sctp_signed_cookie *) retval->body;
1619
1620 /* Set up the parameter header. */
1621 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1622 retval->p.length = htons(*cookie_len);
1623
1624 /* Copy the cookie part of the association itself. */
1625 cookie->c = asoc->c;
1626 /* Save the raw address list length in the cookie. */
1627 cookie->c.raw_addr_list_len = addrs_len;
1628
1629 /* Remember PR-SCTP capability. */
1630 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1631
0f3fffd8
ISJ		 1632 /* Save adaptation indication in the cookie. */
1633 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1634
1635 /* Set an expiration time for the cookie. */
1636 do_gettimeofday(&cookie->c.expiration);
1637 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1638
1639 /* Copy the peer's init packet. */
1640 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1641 ntohs(init_chunk->chunk_hdr->length));
1642
1643 /* Copy the raw local address list of the association. */
1644 memcpy((__u8 *)&cookie->c.peer_init[0] +
1645 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1646
d808ad9a 1647 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1648 struct hash_desc desc;
1649
1da177e4 1650 /* Sign the message. */
68e3f5dd 1651 sg_init_one(&sg, &cookie->c, bodysize);
1da177e4
LT		 1652 keylen = SCTP_SECRET_SIZE;
1653 key = (char *)ep->secret_key[ep->current_key];
d808ad9a
YH		 1654 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1655 desc.flags = 0;
1da177e4 1656
1b489e11
HX		 1657 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1658 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1659 goto free_cookie;
1da177e4
LT		 1660 }
1661
1da177e4 1662 return retval;
1b489e11
HX		 1663
1664free_cookie:
1665 kfree(retval);
1666nodata:
1667 *cookie_len = 0;
1668 return NULL;
1da177e4
LT		 1669}
1670
1671/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1672struct sctp_association *sctp_unpack_cookie(
1673 const struct sctp_endpoint *ep,
1674 const struct sctp_association *asoc,
dd0fc66f 1675 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1676 int *error, struct sctp_chunk **errp)
1677{
1678 struct sctp_association *retval = NULL;
1679 struct sctp_signed_cookie *cookie;
1680 struct sctp_cookie *bear_cookie;
1681 int headersize, bodysize, fixed_size;
313e7b4d 1682 __u8 *digest = ep->digest;
1da177e4
LT		 1683 struct scatterlist sg;
1684 unsigned int keylen, len;
1685 char *key;
1686 sctp_scope_t scope;
1687 struct sk_buff *skb = chunk->skb;
a61bbcf2 1688 struct timeval tv;
1b489e11 1689 struct hash_desc desc;
1da177e4 1690
9834a2bb
VY		 1691 /* Header size is static data prior to the actual cookie, including
1692 * any padding.
1693 */
1694 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1695 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1696 sizeof(struct sctp_cookie));
1da177e4
LT		 1697 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1698 fixed_size = headersize + sizeof(struct sctp_cookie);
1699
1700 /* Verify that the chunk looks like it even has a cookie.
1701 * There must be enough room for our cookie and our peer's
1702 * INIT chunk.
1703 */
1704 len = ntohs(chunk->chunk_hdr->length);
1705 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1706 goto malformed;
1707
1708 /* Verify that the cookie has been padded out. */
1709 if (bodysize % SCTP_COOKIE_MULTIPLE)
1710 goto malformed;
1711
1712 /* Process the cookie. */
1713 cookie = chunk->subh.cookie_hdr;
1714 bear_cookie = &cookie->c;
1715
1716 if (!sctp_sk(ep->base.sk)->hmac)
1717 goto no_hmac;
1718
1719 /* Check the signature. */
1720 keylen = SCTP_SECRET_SIZE;
68e3f5dd 1721 sg_init_one(&sg, bear_cookie, bodysize);
1da177e4 1722 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1723 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1724 desc.flags = 0;
1da177e4 1725
8ca84481 1726 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1727 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1728 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1729 *error = -SCTP_IERROR_NOMEM;
1730 goto fail;
1731 }
1da177e4
LT		 1732
1733 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1734 /* Try the previous key. */
1735 key = (char *)ep->secret_key[ep->last_key];
8ca84481 1736 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1737 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1738 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1739 *error = -SCTP_IERROR_NOMEM;
1740 goto fail;
1741 }
1da177e4
LT		 1742
1743 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1744 /* Yikes! Still bad signature! */
1745 *error = -SCTP_IERROR_BAD_SIG;
1746 goto fail;
1747 }
1748 }
1749
1750no_hmac:
1751 /* IG Section 2.35.2:
1752 * 3) Compare the port numbers and the verification tag contained
1753 * within the COOKIE ECHO chunk to the actual port numbers and the
1754 * verification tag within the SCTP common header of the received
1755 * packet. If these values do not match the packet MUST be silently
1756 * discarded,
1757 */
1758 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1759 *error = -SCTP_IERROR_BAD_TAG;
1760 goto fail;
1761 }
1762
9b1dfad0 1763 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1764 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1765 *error = -SCTP_IERROR_BAD_PORTS;
1766 goto fail;
1767 }
1768
1769 /* Check to see if the cookie is stale. If there is already
1770 * an association, there is no need to check cookie's expiration
1771 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1772 * If skb has been timestamped, then use the stamp, otherwise
1773 * use current time. This introduces a small possibility that
1774 * that a cookie may be considered expired, but his would only slow
1775 * down the new association establishment instead of every packet.
1da177e4 1776 */
f236218b
VY		 1777 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1778 skb_get_timestamp(skb, &tv);
1779 else
1780 do_gettimeofday(&tv);
1781
a61bbcf2 1782 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1da177e4
LT		 1783 /*
1784 * Section 3.3.10.3 Stale Cookie Error (3)
1785 *
1786 * Cause of error
1787 * ---------------
1788 * Stale Cookie Error: Indicates the receipt of a valid State
1789 * Cookie that has expired.
1790 */
1791 len = ntohs(chunk->chunk_hdr->length);
1792 *errp = sctp_make_op_error_space(asoc, chunk, len);
1793 if (*errp) {
a61bbcf2 1794 suseconds_t usecs = (tv.tv_sec -
1da177e4 1795 bear_cookie->expiration.tv_sec) * 1000000L +
a61bbcf2 1796 tv.tv_usec - bear_cookie->expiration.tv_usec;
34bcca28 1797 __be32 n = htonl(usecs);
1da177e4 1798
1da177e4 1799 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1800 sizeof(n));
1801 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1802 *error = -SCTP_IERROR_STALE_COOKIE;
1803 } else
1804 *error = -SCTP_IERROR_NOMEM;
1805
1806 goto fail;
1807 }
1808
1809 /* Make a new base association. */
1810 scope = sctp_scope(sctp_source(chunk));
1811 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1812 if (!retval) {
1813 *error = -SCTP_IERROR_NOMEM;
1814 goto fail;
1815 }
1816
1817 /* Set up our peer's port number. */
1818 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1819
1820 /* Populate the association from the cookie. */
1821 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1822
1823 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1824 GFP_ATOMIC) < 0) {
1825 *error = -SCTP_IERROR_NOMEM;
1826 goto fail;
1827 }
1828
1829 /* Also, add the destination address. */
1830 if (list_empty(&retval->base.bind_addr.address_list)) {
f57d96b2
VY		 1831 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1832 SCTP_ADDR_SRC, GFP_ATOMIC);
1da177e4
LT		 1833 }
1834
1835 retval->next_tsn = retval->c.initial_tsn;
1836 retval->ctsn_ack_point = retval->next_tsn - 1;
1837 retval->addip_serial = retval->c.initial_tsn;
1838 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1839 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1840 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1841
1842 /* The INIT stuff will be done by the side effects. */
1843 return retval;
1844
1845fail:
1846 if (retval)
1847 sctp_association_free(retval);
1848
1849 return NULL;
1850
1851malformed:
1852 /* Yikes! The packet is either corrupt or deliberately
1853 * malformed.
1854 */
1855 *error = -SCTP_IERROR_MALFORMED;
1856 goto fail;
1857}
1858
1859/********************************************************************
1860 * 3rd Level Abstractions
1861 ********************************************************************/
1862
1863struct __sctp_missing {
9f81bcd9
AV		 1864 __be32 num_missing;
1865 __be16 type;
bc10502d 1866} __packed;
1da177e4
LT		 1867
1868/*
1869 * Report a missing mandatory parameter.
1870 */
1871static int sctp_process_missing_param(const struct sctp_association *asoc,
1872 sctp_param_t paramtype,
1873 struct sctp_chunk *chunk,
1874 struct sctp_chunk **errp)
1875{
1876 struct __sctp_missing report;
1877 __u16 len;
1878
1879 len = WORD_ROUND(sizeof(report));
1880
1881 /* Make an ERROR chunk, preparing enough room for
1882 * returning multiple unknown parameters.
1883 */
1884 if (!*errp)
1885 *errp = sctp_make_op_error_space(asoc, chunk, len);
1886
1887 if (*errp) {
1888 report.num_missing = htonl(1);
1889 report.type = paramtype;
ebdfcad4 1890 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1891 sizeof(report));
1892 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1893 }
1894
1895 /* Stop processing this chunk. */
1896 return 0;
1897}
1898
1899/* Report an Invalid Mandatory Parameter. */
1900static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1901 struct sctp_chunk *chunk,
1902 struct sctp_chunk **errp)
1903{
1904 /* Invalid Mandatory Parameter Error has no payload. */
1905
1906 if (!*errp)
1907 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1908
1909 if (*errp)
00f1c2df 1910 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1911
1912 /* Stop processing this chunk. */
1913 return 0;
1914}
1915
1916static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1917 struct sctp_paramhdr *param,
1918 const struct sctp_chunk *chunk,
1919 struct sctp_chunk **errp)
1920{
7ab90804
VY		 1921 /* This is a fatal error. Any accumulated non-fatal errors are
1922 * not reported.
1923 */
1924 if (*errp)
1925 sctp_chunk_free(*errp);
1926
1da177e4 1927 /* Create an error chunk and fill it in with our payload. */
ba016670 1928 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1da177e4
LT		 1929
1930 return 0;
1931}
1932
1933
1934/* Do not attempt to handle the HOST_NAME parm. However, do
1935 * send back an indicator to the peer.
1936 */
1937static int sctp_process_hn_param(const struct sctp_association *asoc,
1938 union sctp_params param,
1939 struct sctp_chunk *chunk,
1940 struct sctp_chunk **errp)
1941{
1942 __u16 len = ntohs(param.p->length);
1943
7ab90804
VY		 1944 /* Processing of the HOST_NAME parameter will generate an
1945 * ABORT. If we've accumulated any non-fatal errors, they
1946 * would be unrecognized parameters and we should not include
1947 * them in the ABORT.
1948 */
1949 if (*errp)
1950 sctp_chunk_free(*errp);
1951
1952 *errp = sctp_make_op_error_space(asoc, chunk, len);
1da177e4 1953
00f1c2df
WY		 1954 if (*errp) {
1955 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1956 sctp_addto_chunk(*errp, len, param.v);
1957 }
1da177e4
LT		 1958
1959 /* Stop processing this chunk. */
1960 return 0;
1961}
1962
f53b5b09 1963static int sctp_verify_ext_param(struct net *net, union sctp_params param)
d6701191
VY		 1964{
1965 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1966 int have_auth = 0;
1967 int have_asconf = 0;
1968 int i;
1969
1970 for (i = 0; i < num_ext; i++) {
1971 switch (param.ext->chunks[i]) {
1972 case SCTP_CID_AUTH:
1973 have_auth = 1;
1974 break;
1975 case SCTP_CID_ASCONF:
1976 case SCTP_CID_ASCONF_ACK:
1977 have_asconf = 1;
1978 break;
1979 }
1980 }
1981
1982 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1983 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1984 * only if ADD-IP is turned on and we are not backward-compatible
1985 * mode.
1986 */
e1fc3b14 1987 if (net->sctp.addip_noauth)
d6701191
VY		 1988 return 1;
1989
e1fc3b14 1990 if (net->sctp.addip_enable && !have_auth && have_asconf)
d6701191
VY		 1991 return 0;
1992
1993 return 1;
1994}
1995
131a47e3
VY		 1996static void sctp_process_ext_param(struct sctp_association *asoc,
1997 union sctp_params param)
1998{
e1fc3b14 1999 struct net *net = sock_net(asoc->base.sk);
131a47e3
VY		 2000 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2001 int i;
2002
2003 for (i = 0; i < num_ext; i++) {
2004 switch (param.ext->chunks[i]) {
2005 case SCTP_CID_FWD_TSN:
e1fc3b14 2006 if (net->sctp.prsctp_enable &&
131a47e3
VY		 2007 !asoc->peer.prsctp_capable)
2008 asoc->peer.prsctp_capable = 1;
2009 break;
730fc3d0
VY		 2010 case SCTP_CID_AUTH:
2011 /* if the peer reports AUTH, assume that he
2012 * supports AUTH.
2013 */
e1fc3b14 2014 if (net->sctp.auth_enable)
0ef46e28 2015 asoc->peer.auth_capable = 1;
730fc3d0 2016 break;
131a47e3
VY		 2017 case SCTP_CID_ASCONF:
2018 case SCTP_CID_ASCONF_ACK:
e1fc3b14 2019 if (net->sctp.addip_enable)
0ef46e28 2020 asoc->peer.asconf_capable = 1;
6b2f9cb6 2021 break;
131a47e3
VY		 2022 default:
2023 break;
2024 }
2025 }
2026}
2027
1da177e4
LT		 2028/* RFC 3.2.1 & the Implementers Guide 2.2.
2029 *
2030 * The Parameter Types are encoded such that the
2031 * highest-order two bits specify the action that must be
2032 * taken if the processing endpoint does not recognize the
2033 * Parameter Type.
2034 *
7ab90804
VY		 2035 * 00 - Stop processing this parameter; do not process any further
2036 * parameters within this chunk
1da177e4 2037 *
7ab90804
VY		 2038 * 01 - Stop processing this parameter, do not process any further
2039 * parameters within this chunk, and report the unrecognized
2040 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2041 *
2042 * 10 - Skip this parameter and continue processing.
2043 *
2044 * 11 - Skip this parameter and continue processing but
2045 * report the unrecognized parameter in an
7ab90804 2046 * 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2047 *
2048 * Return value:
7ab90804
VY		 2049 * SCTP_IERROR_NO_ERROR - continue with the chunk
2050 * SCTP_IERROR_ERROR - stop and report an error.
2051 * SCTP_IERROR_NOMEME - out of memory.
1da177e4 2052 */
7ab90804
VY		 2053static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2054 union sctp_params param,
2055 struct sctp_chunk *chunk,
2056 struct sctp_chunk **errp)
1da177e4 2057{
7ab90804 2058 int retval = SCTP_IERROR_NO_ERROR;
1da177e4
LT		 2059
2060 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2061 case SCTP_PARAM_ACTION_DISCARD:
7ab90804 2062 retval = SCTP_IERROR_ERROR;
1da177e4
LT		 2063 break;
2064 case SCTP_PARAM_ACTION_SKIP:
2065 break;
7ab90804
VY		 2066 case SCTP_PARAM_ACTION_DISCARD_ERR:
2067 retval = SCTP_IERROR_ERROR;
2068 /* Fall through */
1da177e4
LT		 2069 case SCTP_PARAM_ACTION_SKIP_ERR:
2070 /* Make an ERROR chunk, preparing enough room for
2071 * returning multiple unknown parameters.
2072 */
2073 if (NULL == *errp)
5fa782c2 2074 *errp = sctp_make_op_error_fixed(asoc, chunk);
1da177e4
LT		 2075
2076 if (*errp) {
2205a6ea
JB		 2077 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2078 WORD_ROUND(ntohs(param.p->length))))
2079 sctp_addto_chunk_fixed(*errp,
2080 WORD_ROUND(ntohs(param.p->length)),
2081 param.v);
1da177e4
LT		 2082 } else {
2083 /* If there is no memory for generating the ERROR
2084 * report as specified, an ABORT will be triggered
2085 * to the peer and the association won't be
2086 * established.
2087 */
7ab90804 2088 retval = SCTP_IERROR_NOMEM;
1da177e4 2089 }
1da177e4
LT		 2090 break;
2091 default:
2092 break;
2093 }
2094
2095 return retval;
2096}
2097
7ab90804 2098/* Verify variable length parameters
1da177e4 2099 * Return values:
7ab90804
VY		 2100 * SCTP_IERROR_ABORT - trigger an ABORT
2101 * SCTP_IERROR_NOMEM - out of memory (abort)
2102 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2103 * SCTP_IERROR_NO_ERROR - continue with the chunk
1da177e4 2104 */
f53b5b09
EB		 2105static sctp_ierror_t sctp_verify_param(struct net *net,
2106 const struct sctp_association *asoc,
7ab90804
VY		 2107 union sctp_params param,
2108 sctp_cid_t cid,
2109 struct sctp_chunk *chunk,
2110 struct sctp_chunk **err_chunk)
1da177e4 2111{
72da7b38 2112 struct sctp_hmac_algo_param *hmacs;
7ab90804 2113 int retval = SCTP_IERROR_NO_ERROR;
72da7b38
WY		 2114 __u16 n_elt, id = 0;
2115 int i;
1da177e4
LT		 2116
2117 /* FIXME - This routine is not looking at each parameter per the
2118 * chunk type, i.e., unrecognized parameters should be further
2119 * identified based on the chunk id.
2120 */
2121
2122 switch (param.p->type) {
2123 case SCTP_PARAM_IPV4_ADDRESS:
2124 case SCTP_PARAM_IPV6_ADDRESS:
2125 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2126 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2127 case SCTP_PARAM_STATE_COOKIE:
2128 case SCTP_PARAM_HEARTBEAT_INFO:
2129 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2130 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 2131 case SCTP_PARAM_ADAPTATION_LAYER_IND:
d6701191
VY		 2132 break;
2133
131a47e3 2134 case SCTP_PARAM_SUPPORTED_EXT:
f53b5b09 2135 if (!sctp_verify_ext_param(net, param))
d6701191 2136 return SCTP_IERROR_ABORT;
1da177e4
LT		 2137 break;
2138
d6de3097 2139 case SCTP_PARAM_SET_PRIMARY:
e1fc3b14 2140 if (net->sctp.addip_enable)
d6de3097
VY		 2141 break;
2142 goto fallthrough;
2143
1da177e4
LT		 2144 case SCTP_PARAM_HOST_NAME_ADDRESS:
2145 /* Tell the peer, we won't support this param. */
7ab90804
VY		 2146 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2147 retval = SCTP_IERROR_ABORT;
2148 break;
131a47e3 2149
1da177e4 2150 case SCTP_PARAM_FWD_TSN_SUPPORT:
e1fc3b14 2151 if (net->sctp.prsctp_enable)
1da177e4 2152 break;
730fc3d0
VY		 2153 goto fallthrough;
2154
2155 case SCTP_PARAM_RANDOM:
e1fc3b14 2156 if (!net->sctp.auth_enable)
730fc3d0
VY		 2157 goto fallthrough;
2158
2159 /* SCTP-AUTH: Secion 6.1
2160 * If the random number is not 32 byte long the association
2161 * MUST be aborted. The ABORT chunk SHOULD contain the error
2162 * cause 'Protocol Violation'.
2163 */
2164 if (SCTP_AUTH_RANDOM_LENGTH !=
7ab90804
VY		 2165 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2166 sctp_process_inv_paramlength(asoc, param.p,
730fc3d0 2167 chunk, err_chunk);
7ab90804
VY		 2168 retval = SCTP_IERROR_ABORT;
2169 }
730fc3d0
VY		 2170 break;
2171
2172 case SCTP_PARAM_CHUNKS:
e1fc3b14 2173 if (!net->sctp.auth_enable)
730fc3d0
VY		 2174 goto fallthrough;
2175
2176 /* SCTP-AUTH: Section 3.2
2177 * The CHUNKS parameter MUST be included once in the INIT or
2178 * INIT-ACK chunk if the sender wants to receive authenticated
2179 * chunks. Its maximum length is 260 bytes.
2180 */
7ab90804
VY		 2181 if (260 < ntohs(param.p->length)) {
2182 sctp_process_inv_paramlength(asoc, param.p,
2183 chunk, err_chunk);
2184 retval = SCTP_IERROR_ABORT;
2185 }
730fc3d0
VY		 2186 break;
2187
2188 case SCTP_PARAM_HMAC_ALGO:
e1fc3b14 2189 if (!net->sctp.auth_enable)
72da7b38
WY		 2190 goto fallthrough;
2191
2192 hmacs = (struct sctp_hmac_algo_param *)param.p;
2193 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2194
2195 /* SCTP-AUTH: Section 6.1
2196 * The HMAC algorithm based on SHA-1 MUST be supported and
2197 * included in the HMAC-ALGO parameter.
2198 */
2199 for (i = 0; i < n_elt; i++) {
2200 id = ntohs(hmacs->hmac_ids[i]);
2201
2202 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2203 break;
2204 }
2205
2206 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2207 sctp_process_inv_paramlength(asoc, param.p, chunk,
2208 err_chunk);
2209 retval = SCTP_IERROR_ABORT;
2210 }
2211 break;
730fc3d0 2212fallthrough:
1da177e4
LT		 2213 default:
2214 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2215 ntohs(param.p->type), cid);
7ab90804 2216 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
1da177e4
LT		 2217 break;
2218 }
2219 return retval;
2220}
2221
2222/* Verify the INIT packet before we process it. */
f53b5b09 2223int sctp_verify_init(struct net *net, const struct sctp_association *asoc,
1da177e4
LT		 2224 sctp_cid_t cid,
2225 sctp_init_chunk_t *peer_init,
2226 struct sctp_chunk *chunk,
2227 struct sctp_chunk **errp)
2228{
2229 union sctp_params param;
2230 int has_cookie = 0;
7ab90804 2231 int result;
1da177e4
LT		 2232
2233 /* Verify stream values are non-zero. */
2234 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
d023f629
VY		 2235 (0 == peer_init->init_hdr.num_inbound_streams) ||
2236 (0 == peer_init->init_hdr.init_tag) ||
2237 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
1da177e4 2238
7ab90804 2239 return sctp_process_inv_mandatory(asoc, chunk, errp);
1da177e4
LT		 2240 }
2241
2242 /* Check for missing mandatory parameters. */
2243 sctp_walk_params(param, peer_init, init_hdr.params) {
2244
2245 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2246 has_cookie = 1;
2247
2248 } /* for (loop through all parameters) */
2249
2250 /* There is a possibility that a parameter length was bad and
2251 * in that case we would have stoped walking the parameters.
2252 * The current param.p would point at the bad one.
2253 * Current consensus on the mailing list is to generate a PROTOCOL
2254 * VIOLATION error. We build the ERROR chunk here and let the normal
2255 * error handling code build and send the packet.
2256 */
7ab90804
VY		 2257 if (param.v != (void*)chunk->chunk_end)
2258 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
1da177e4
LT		 2259
2260 /* The only missing mandatory param possible today is
2261 * the state cookie for an INIT-ACK chunk.
2262 */
7ab90804
VY		 2263 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2264 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2265 chunk, errp);
1da177e4 2266
7ab90804 2267 /* Verify all the variable length parameters */
1da177e4
LT		 2268 sctp_walk_params(param, peer_init, init_hdr.params) {
2269
f53b5b09 2270 result = sctp_verify_param(net, asoc, param, cid, chunk, errp);
7ab90804
VY		 2271 switch (result) {
2272 case SCTP_IERROR_ABORT:
2273 case SCTP_IERROR_NOMEM:
1da177e4 2274 return 0;
7ab90804 2275 case SCTP_IERROR_ERROR:
1da177e4 2276 return 1;
7ab90804
VY		 2277 case SCTP_IERROR_NO_ERROR:
2278 default:
2279 break;
1da177e4
LT		 2280 }
2281
2282 } /* for (loop through all parameters) */
2283
2284 return 1;
2285}
2286
2287/* Unpack the parameters in an INIT packet into an association.
2288 * Returns 0 on failure, else success.
2289 * FIXME: This is an association method.
2290 */
de6becdc 2291int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
1da177e4 2292 const union sctp_addr *peer_addr,
dd0fc66f 2293 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4 2294{
e1fc3b14 2295 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 2296 union sctp_params param;
2297 struct sctp_transport *transport;
2298 struct list_head *pos, *temp;
de6becdc
WY		 2299 struct sctp_af *af;
2300 union sctp_addr addr;
1da177e4 2301 char *cookie;
de6becdc 2302 int src_match = 0;
1da177e4
LT		 2303
2304 /* We must include the address that the INIT packet came from.
2305 * This is the only address that matters for an INIT packet.
2306 * When processing a COOKIE ECHO, we retrieve the from address
2307 * of the INIT from the cookie.
2308 */
2309
2310 /* This implementation defaults to making the first transport
2311 * added as the primary transport. The source address seems to
2312 * be a a better choice than any of the embedded addresses.
2313 */
de6becdc
WY		 2314 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2315 goto nomem;
2316
2317 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2318 src_match = 1;
1da177e4
LT		 2319
2320 /* Process the initialization parameters. */
1da177e4 2321 sctp_walk_params(param, peer_init, init_hdr.params) {
de6becdc
WY		 2322 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2323 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2324 af = sctp_get_af_specific(param_type2af(param.p->type));
2325 af->from_addr_param(&addr, param.addr,
2326 chunk->sctp_hdr->source, 0);
2327 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2328 src_match = 1;
2329 }
1da177e4
LT		 2330
2331 if (!sctp_process_param(asoc, param, peer_addr, gfp))
d808ad9a 2332 goto clean_up;
1da177e4
LT		 2333 }
2334
de6becdc
WY		 2335 /* source address of chunk may not match any valid address */
2336 if (!src_match)
2337 goto clean_up;
2338
730fc3d0
VY		 2339 /* AUTH: After processing the parameters, make sure that we
2340 * have all the required info to potentially do authentications.
2341 */
2342 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2343 !asoc->peer.peer_hmacs))
2344 asoc->peer.auth_capable = 0;
2345
d6701191
VY		 2346 /* In a non-backward compatible mode, if the peer claims
2347 * support for ADD-IP but not AUTH, the ADD-IP spec states
2348 * that we MUST ABORT the association. Section 6. The section
2349 * also give us an option to silently ignore the packet, which
2350 * is what we'll do here.
6b2f9cb6 2351 */
e1fc3b14 2352 if (!net->sctp.addip_noauth &&
73d9c4fd 2353 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
6b2f9cb6
VY		 2354 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2355 SCTP_PARAM_DEL_IP |
2356 SCTP_PARAM_SET_PRIMARY);
88799fe5 2357 asoc->peer.asconf_capable = 0;
d6701191 2358 goto clean_up;
6b2f9cb6
VY		 2359 }
2360
3f7a87d2
FF		 2361 /* Walk list of transports, removing transports in the UNKNOWN state. */
2362 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2363 transport = list_entry(pos, struct sctp_transport, transports);
2364 if (transport->state == SCTP_UNKNOWN) {
2365 sctp_assoc_rm_peer(asoc, transport);
2366 }
2367 }
2368
1da177e4
LT		 2369 /* The fixed INIT headers are always in network byte
2370 * order.
2371 */
2372 asoc->peer.i.init_tag =
2373 ntohl(peer_init->init_hdr.init_tag);
2374 asoc->peer.i.a_rwnd =
2375 ntohl(peer_init->init_hdr.a_rwnd);
2376 asoc->peer.i.num_outbound_streams =
2377 ntohs(peer_init->init_hdr.num_outbound_streams);
2378 asoc->peer.i.num_inbound_streams =
2379 ntohs(peer_init->init_hdr.num_inbound_streams);
2380 asoc->peer.i.initial_tsn =
2381 ntohl(peer_init->init_hdr.initial_tsn);
2382
2383 /* Apply the upper bounds for output streams based on peer's
2384 * number of inbound streams.
2385 */
2386 if (asoc->c.sinit_num_ostreams >
2387 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2388 asoc->c.sinit_num_ostreams =
2389 ntohs(peer_init->init_hdr.num_inbound_streams);
2390 }
2391
2392 if (asoc->c.sinit_max_instreams >
2393 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2394 asoc->c.sinit_max_instreams =
2395 ntohs(peer_init->init_hdr.num_outbound_streams);
2396 }
2397
2398 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2399 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2400
2401 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2402 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2403
2404 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2405 cookie = asoc->peer.cookie;
2406 if (cookie) {
af997d8c 2407 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
1da177e4
LT		 2408 if (!asoc->peer.cookie)
2409 goto clean_up;
1da177e4
LT		 2410 }
2411
2412 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2413 * high (for example, implementations MAY use the size of the receiver
2414 * advertised window).
2415 */
9dbc15f0
RD		 2416 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2417 transports) {
1da177e4
LT		 2418 transport->ssthresh = asoc->peer.i.a_rwnd;
2419 }
2420
2421 /* Set up the TSN tracking pieces. */
8e1ee18c
VY		 2422 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2423 asoc->peer.i.initial_tsn, gfp))
2424 goto clean_up;
1da177e4
LT		 2425
2426 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2427 *
2428 * The stream sequence number in all the streams shall start
2429 * from 0 when the association is established. Also, when the
2430 * stream sequence number reaches the value 65535 the next
2431 * stream sequence number shall be set to 0.
2432 */
2433
3f7a87d2 2434 /* Allocate storage for the negotiated streams if it is not a temporary
d808ad9a 2435 * association.
1da177e4
LT		 2436 */
2437 if (!asoc->temp) {
1da177e4
LT		 2438 int error;
2439
2440 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2441 asoc->c.sinit_num_ostreams, gfp);
2442 if (!asoc->ssnmap)
2443 goto clean_up;
2444
07d93967
VY		 2445 error = sctp_assoc_set_id(asoc, gfp);
2446 if (error)
1da177e4 2447 goto clean_up;
1da177e4
LT		 2448 }
2449
2450 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2451 *
2452 * When an endpoint has an ASCONF signaled change to be sent to the
2453 * remote endpoint it should do the following:
2454 * ...
2455 * A2) A serial number should be assigned to the Chunk. The serial
2456 * number should be a monotonically increasing number. All serial
2457 * numbers are defined to be initialized at the start of the
2458 * association to the same value as the Initial TSN.
2459 */
2460 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2461 return 1;
2462
2463clean_up:
2464 /* Release the transport structures. */
2465 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2466 transport = list_entry(pos, struct sctp_transport, transports);
add52379
VY		 2467 if (transport->state != SCTP_ACTIVE)
2468 sctp_assoc_rm_peer(asoc, transport);
1da177e4 2469 }
3f7a87d2 2470
1da177e4
LT		 2471nomem:
2472 return 0;
2473}
2474
2475
2476/* Update asoc with the option described in param.
2477 *
2478 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2479 *
2480 * asoc is the association to update.
2481 * param is the variable length parameter to use for update.
2482 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2483 * If the current packet is an INIT we want to minimize the amount of
2484 * work we do. In particular, we should not build transport
2485 * structures for the addresses.
2486 */
2487static int sctp_process_param(struct sctp_association *asoc,
2488 union sctp_params param,
2489 const union sctp_addr *peer_addr,
dd0fc66f 2490 gfp_t gfp)
1da177e4 2491{
e7ff4a70 2492 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 2493 union sctp_addr addr;
2494 int i;
2495 __u16 sat;
2496 int retval = 1;
2497 sctp_scope_t scope;
2498 time_t stale;
2499 struct sctp_af *af;
d6de3097
VY		 2500 union sctp_addr_param *addr_param;
2501 struct sctp_transport *t;
1da177e4
LT		 2502
2503 /* We maintain all INIT parameters in network byte order all the
2504 * time. This allows us to not worry about whether the parameters
2505 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2506 */
2507 switch (param.p->type) {
2508 case SCTP_PARAM_IPV6_ADDRESS:
2509 if (PF_INET6 != asoc->base.sk->sk_family)
2510 break;
7dab83de
VY		 2511 goto do_addr_param;
2512
1da177e4 2513 case SCTP_PARAM_IPV4_ADDRESS:
7dab83de
VY		 2514 /* v4 addresses are not allowed on v6-only socket */
2515 if (ipv6_only_sock(asoc->base.sk))
2516 break;
2517do_addr_param:
1da177e4 2518 af = sctp_get_af_specific(param_type2af(param.p->type));
dd86d136 2519 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
1da177e4 2520 scope = sctp_scope(peer_addr);
e7ff4a70 2521 if (sctp_in_scope(net, &addr, scope))
dd86d136 2522 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2523 return 0;
2524 break;
2525
2526 case SCTP_PARAM_COOKIE_PRESERVATIVE:
e1fc3b14 2527 if (!net->sctp.cookie_preserve_enable)
1da177e4
LT		 2528 break;
2529
2530 stale = ntohl(param.life->lifespan_increment);
2531
2532 /* Suggested Cookie Life span increment's unit is msec,
2533 * (1/1000sec).
2534 */
2535 asoc->cookie_life.tv_sec += stale / 1000;
2536 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2537 break;
2538
2539 case SCTP_PARAM_HOST_NAME_ADDRESS:
2540 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2541 break;
2542
2543 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2544 /* Turn off the default values first so we'll know which
2545 * ones are really set by the peer.
2546 */
2547 asoc->peer.ipv4_address = 0;
2548 asoc->peer.ipv6_address = 0;
2549
140ee960
GJ		 2550 /* Assume that peer supports the address family
2551 * by which it sends a packet.
2552 */
2553 if (peer_addr->sa.sa_family == AF_INET6)
2554 asoc->peer.ipv6_address = 1;
2555 else if (peer_addr->sa.sa_family == AF_INET)
2556 asoc->peer.ipv4_address = 1;
2557
1da177e4
LT		 2558 /* Cycle through address types; avoid divide by 0. */
2559 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2560 if (sat)
2561 sat /= sizeof(__u16);
2562
2563 for (i = 0; i < sat; ++i) {
2564 switch (param.sat->types[i]) {
2565 case SCTP_PARAM_IPV4_ADDRESS:
2566 asoc->peer.ipv4_address = 1;
2567 break;
2568
2569 case SCTP_PARAM_IPV6_ADDRESS:
6e40a915
WY		 2570 if (PF_INET6 == asoc->base.sk->sk_family)
2571 asoc->peer.ipv6_address = 1;
1da177e4
LT		 2572 break;
2573
2574 case SCTP_PARAM_HOST_NAME_ADDRESS:
2575 asoc->peer.hostname_address = 1;
2576 break;
2577
2578 default: /* Just ignore anything else. */
2579 break;
3ff50b79 2580 }
1da177e4
LT		 2581 }
2582 break;
2583
2584 case SCTP_PARAM_STATE_COOKIE:
2585 asoc->peer.cookie_len =
2586 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2587 asoc->peer.cookie = param.cookie->body;
2588 break;
2589
2590 case SCTP_PARAM_HEARTBEAT_INFO:
2591 /* Would be odd to receive, but it causes no problems. */
2592 break;
2593
2594 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2595 /* Rejected during verify stage. */
2596 break;
2597
2598 case SCTP_PARAM_ECN_CAPABLE:
2599 asoc->peer.ecn_capable = 1;
2600 break;
2601
0f3fffd8 2602 case SCTP_PARAM_ADAPTATION_LAYER_IND:
e69c4e0f 2603 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
1da177e4
LT		 2604 break;
2605
d6de3097 2606 case SCTP_PARAM_SET_PRIMARY:
e1fc3b14 2607 if (!net->sctp.addip_enable)
0ef46e28
VY		 2608 goto fall_through;
2609
d6de3097
VY		 2610 addr_param = param.v + sizeof(sctp_addip_param_t);
2611
2612 af = sctp_get_af_specific(param_type2af(param.p->type));
2613 af->from_addr_param(&addr, addr_param,
2614 htons(asoc->peer.port), 0);
2615
2616 /* if the address is invalid, we can't process it.
2617 * XXX: see spec for what to do.
2618 */
2619 if (!af->addr_valid(&addr, NULL, NULL))
2620 break;
2621
2622 t = sctp_assoc_lookup_paddr(asoc, &addr);
2623 if (!t)
2624 break;
2625
2626 sctp_assoc_set_primary(asoc, t);
2627 break;
2628
131a47e3
VY		 2629 case SCTP_PARAM_SUPPORTED_EXT:
2630 sctp_process_ext_param(asoc, param);
2631 break;
2632
1da177e4 2633 case SCTP_PARAM_FWD_TSN_SUPPORT:
e1fc3b14 2634 if (net->sctp.prsctp_enable) {
1da177e4
LT		 2635 asoc->peer.prsctp_capable = 1;
2636 break;
2637 }
d808ad9a 2638 /* Fall Through */
730fc3d0
VY		 2639 goto fall_through;
2640
2641 case SCTP_PARAM_RANDOM:
e1fc3b14 2642 if (!net->sctp.auth_enable)
730fc3d0
VY		 2643 goto fall_through;
2644
2645 /* Save peer's random parameter */
2646 asoc->peer.peer_random = kmemdup(param.p,
2647 ntohs(param.p->length), gfp);
2648 if (!asoc->peer.peer_random) {
2649 retval = 0;
2650 break;
2651 }
2652 break;
2653
2654 case SCTP_PARAM_HMAC_ALGO:
e1fc3b14 2655 if (!net->sctp.auth_enable)
730fc3d0
VY		 2656 goto fall_through;
2657
2658 /* Save peer's HMAC list */
2659 asoc->peer.peer_hmacs = kmemdup(param.p,
2660 ntohs(param.p->length), gfp);
2661 if (!asoc->peer.peer_hmacs) {
2662 retval = 0;
2663 break;
2664 }
2665
2666 /* Set the default HMAC the peer requested*/
2667 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2668 break;
2669
2670 case SCTP_PARAM_CHUNKS:
e1fc3b14 2671 if (!net->sctp.auth_enable)
730fc3d0
VY		 2672 goto fall_through;
2673
2674 asoc->peer.peer_chunks = kmemdup(param.p,
2675 ntohs(param.p->length), gfp);
2676 if (!asoc->peer.peer_chunks)
2677 retval = 0;
2678 break;
2679fall_through:
1da177e4
LT		 2680 default:
2681 /* Any unrecognized parameters should have been caught
2682 * and handled by sctp_verify_param() which should be
2683 * called prior to this routine. Simply log the error
2684 * here.
2685 */
2686 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2687 ntohs(param.p->type), asoc);
2688 break;
3ff50b79 2689 }
1da177e4
LT		 2690
2691 return retval;
2692}
2693
2694/* Select a new verification tag. */
2695__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2696{
2697 /* I believe that this random number generator complies with RFC1750.
2698 * A tag of 0 is reserved for special cases (e.g. INIT).
2699 */
2700 __u32 x;
2701
2702 do {
2703 get_random_bytes(&x, sizeof(__u32));
2704 } while (x == 0);
2705
2706 return x;
2707}
2708
2709/* Select an initial TSN to send during startup. */
2710__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2711{
2712 __u32 retval;
2713
2714 get_random_bytes(&retval, sizeof(__u32));
2715 return retval;
2716}
2717
2718/*
2719 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2720 * 0 1 2 3
2721 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2723 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2725 * | Serial Number |
2726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2727 * | Address Parameter |
2728 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2729 * | ASCONF Parameter #1 |
2730 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2731 * \ \
2732 * / .... /
2733 * \ \
2734 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * | ASCONF Parameter #N |
2736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2737 *
d808ad9a 2738 * Address Parameter and other parameter will not be wrapped in this function
1da177e4
LT		 2739 */
2740static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2741 union sctp_addr *addr,
2742 int vparam_len)
2743{
2744 sctp_addiphdr_t asconf;
2745 struct sctp_chunk *retval;
2746 int length = sizeof(asconf) + vparam_len;
2747 union sctp_addr_param addrparam;
2748 int addrlen;
2749 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2750
2751 addrlen = af->to_addr_param(addr, &addrparam);
2752 if (!addrlen)
2753 return NULL;
2754 length += addrlen;
2755
2756 /* Create the chunk. */
2757 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2758 if (!retval)
2759 return NULL;
2760
2761 asconf.serial = htonl(asoc->addip_serial++);
2762
2763 retval->subh.addip_hdr =
2764 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2765 retval->param_hdr.v =
2766 sctp_addto_chunk(retval, addrlen, &addrparam);
2767
2768 return retval;
2769}
2770
2771/* ADDIP
2772 * 3.2.1 Add IP Address
2773 * 0 1 2 3
2774 * 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
2775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2776 * | Type = 0xC001 | Length = Variable |
2777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2778 * | ASCONF-Request Correlation ID |
2779 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2780 * | Address Parameter |
2781 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2782 *
2783 * 3.2.2 Delete IP Address
2784 * 0 1 2 3
2785 * 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
2786 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2787 * | Type = 0xC002 | Length = Variable |
2788 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * | ASCONF-Request Correlation ID |
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | Address Parameter |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 *
2794 */
2795struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2796 union sctp_addr *laddr,
2797 struct sockaddr *addrs,
2798 int addrcnt,
dbc16db1 2799 __be16 flags)
1da177e4
LT		 2800{
2801 sctp_addip_param_t param;
2802 struct sctp_chunk *retval;
2803 union sctp_addr_param addr_param;
2804 union sctp_addr *addr;
2805 void *addr_buf;
2806 struct sctp_af *af;
2807 int paramlen = sizeof(param);
2808 int addr_param_len = 0;
2809 int totallen = 0;
2810 int i;
8a07eb0a 2811 int del_pickup = 0;
1da177e4
LT		 2812
2813 /* Get total length of all the address parameters. */
2814 addr_buf = addrs;
2815 for (i = 0; i < addrcnt; i++) {
ea110733 2816 addr = addr_buf;
1da177e4
LT		 2817 af = sctp_get_af_specific(addr->v4.sin_family);
2818 addr_param_len = af->to_addr_param(addr, &addr_param);
2819
2820 totallen += paramlen;
2821 totallen += addr_param_len;
2822
2823 addr_buf += af->sockaddr_len;
8a07eb0a
MH		 2824 if (asoc->asconf_addr_del_pending && !del_pickup) {
2825 /* reuse the parameter length from the same scope one */
2826 totallen += paramlen;
2827 totallen += addr_param_len;
2828 del_pickup = 1;
2829 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
2830 }
1da177e4
LT		 2831 }
2832
2833 /* Create an asconf chunk with the required length. */
2834 retval = sctp_make_asconf(asoc, laddr, totallen);
2835 if (!retval)
2836 return NULL;
2837
2838 /* Add the address parameters to the asconf chunk. */
2839 addr_buf = addrs;
2840 for (i = 0; i < addrcnt; i++) {
ea110733 2841 addr = addr_buf;
1da177e4
LT		 2842 af = sctp_get_af_specific(addr->v4.sin_family);
2843 addr_param_len = af->to_addr_param(addr, &addr_param);
2844 param.param_hdr.type = flags;
2845 param.param_hdr.length = htons(paramlen + addr_param_len);
2846 param.crr_id = i;
2847
2848 sctp_addto_chunk(retval, paramlen, &param);
2849 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2850
2851 addr_buf += af->sockaddr_len;
2852 }
8a07eb0a
MH		 2853 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2854 addr = asoc->asconf_addr_del_pending;
2855 af = sctp_get_af_specific(addr->v4.sin_family);
2856 addr_param_len = af->to_addr_param(addr, &addr_param);
2857 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2858 param.param_hdr.length = htons(paramlen + addr_param_len);
2859 param.crr_id = i;
2860
2861 sctp_addto_chunk(retval, paramlen, &param);
2862 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2863 }
1da177e4
LT		 2864 return retval;
2865}
2866
2867/* ADDIP
2868 * 3.2.4 Set Primary IP Address
2869 * 0 1 2 3
2870 * 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
2871 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2872 * | Type =0xC004 | Length = Variable |
2873 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2874 * | ASCONF-Request Correlation ID |
2875 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2876 * | Address Parameter |
2877 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2878 *
d808ad9a 2879 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2880 */
2881struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2882 union sctp_addr *addr)
2883{
2884 sctp_addip_param_t param;
2885 struct sctp_chunk *retval;
2886 int len = sizeof(param);
2887 union sctp_addr_param addrparam;
2888 int addrlen;
2889 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2890
2891 addrlen = af->to_addr_param(addr, &addrparam);
2892 if (!addrlen)
2893 return NULL;
2894 len += addrlen;
2895
2896 /* Create the chunk and make asconf header. */
2897 retval = sctp_make_asconf(asoc, addr, len);
2898 if (!retval)
2899 return NULL;
2900
2901 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2902 param.param_hdr.length = htons(len);
2903 param.crr_id = 0;
2904
2905 sctp_addto_chunk(retval, sizeof(param), &param);
2906 sctp_addto_chunk(retval, addrlen, &addrparam);
2907
2908 return retval;
2909}
2910
2911/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2912 * 0 1 2 3
2913 * 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
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | Type = 0x80 | Chunk Flags | Chunk Length |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2917 * | Serial Number |
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2919 * | ASCONF Parameter Response#1 |
2920 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2921 * \ \
2922 * / .... /
2923 * \ \
2924 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2925 * | ASCONF Parameter Response#N |
2926 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2927 *
d808ad9a 2928 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2929 */
2930static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2931 __u32 serial, int vparam_len)
2932{
2933 sctp_addiphdr_t asconf;
2934 struct sctp_chunk *retval;
2935 int length = sizeof(asconf) + vparam_len;
2936
2937 /* Create the chunk. */
2938 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2939 if (!retval)
2940 return NULL;
2941
2942 asconf.serial = htonl(serial);
2943
2944 retval->subh.addip_hdr =
2945 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2946
2947 return retval;
2948}
2949
2950/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2951static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2952 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2953{
2954 sctp_addip_param_t ack_param;
2955 sctp_errhdr_t err_param;
2956 int asconf_param_len = 0;
2957 int err_param_len = 0;
dbc16db1 2958 __be16 response_type;
1da177e4
LT		 2959
2960 if (SCTP_ERROR_NO_ERROR == err_code) {
2961 response_type = SCTP_PARAM_SUCCESS_REPORT;
2962 } else {
2963 response_type = SCTP_PARAM_ERR_CAUSE;
2964 err_param_len = sizeof(err_param);
2965 if (asconf_param)
2966 asconf_param_len =
2967 ntohs(asconf_param->param_hdr.length);
2968 }
2969
d808ad9a 2970 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2971 ack_param.param_hdr.type = response_type;
2972 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2973 err_param_len +
2974 asconf_param_len);
2975 ack_param.crr_id = crr_id;
2976 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2977
2978 if (SCTP_ERROR_NO_ERROR == err_code)
2979 return;
2980
2981 /* Add Error Cause parameter. */
2982 err_param.cause = err_code;
2983 err_param.length = htons(err_param_len + asconf_param_len);
2984 sctp_addto_chunk(chunk, err_param_len, &err_param);
2985
2986 /* Add the failed TLV copied from ASCONF chunk. */
2987 if (asconf_param)
2988 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2989}
2990
2991/* Process a asconf parameter. */
dbc16db1 2992static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2993 struct sctp_chunk *asconf,
2994 sctp_addip_param_t *asconf_param)
2995{
2996 struct sctp_transport *peer;
2997 struct sctp_af *af;
2998 union sctp_addr addr;
1da177e4 2999 union sctp_addr_param *addr_param;
5f242a13 3000
ea110733 3001 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
c1cc678a 3002
44e65c1e
WY		 3003 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3004 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3005 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3006 return SCTP_ERROR_UNKNOWN_PARAM;
3007
6a435732 3008 switch (addr_param->p.type) {
c4492586
WY		 3009 case SCTP_PARAM_IPV6_ADDRESS:
3010 if (!asoc->peer.ipv6_address)
945e5abc 3011 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 3012 break;
3013 case SCTP_PARAM_IPV4_ADDRESS:
3014 if (!asoc->peer.ipv4_address)
945e5abc 3015 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 3016 break;
3017 default:
945e5abc 3018 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 3019 }
3020
6a435732 3021 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
1da177e4 3022 if (unlikely(!af))
945e5abc 3023 return SCTP_ERROR_DNS_FAILED;
1da177e4 3024
dd86d136 3025 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
42e30bf3
VY		 3026
3027 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3028 * or multicast address.
3029 * (note: wildcard is permitted and requires special handling so
3030 * make sure we check for that)
3031 */
3032 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
945e5abc 3033 return SCTP_ERROR_DNS_FAILED;
42e30bf3 3034
1da177e4
LT		 3035 switch (asconf_param->param_hdr.type) {
3036 case SCTP_PARAM_ADD_IP:
42e30bf3
VY		 3037 /* Section 4.2.1:
3038 * If the address 0.0.0.0 or ::0 is provided, the source
3039 * address of the packet MUST be added.
3040 */
3041 if (af->is_any(&addr))
3042 memcpy(&addr, &asconf->source, sizeof(addr));
3043
1da177e4 3044 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 3045 * request and does not have the local resources to add this
3046 * new address to the association, it MUST return an Error
3047 * Cause TLV set to the new error code 'Operation Refused
3048 * Due to Resource Shortage'.
3049 */
1da177e4 3050
dd86d136 3051 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 3052 if (!peer)
3053 return SCTP_ERROR_RSRC_LOW;
3054
3055 /* Start the heartbeat timer. */
3056 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3057 sctp_transport_hold(peer);
6af29ccc 3058 asoc->new_transport = peer;
1da177e4
LT		 3059 break;
3060 case SCTP_PARAM_DEL_IP:
3061 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 3062 * last remaining IP address of a peer endpoint, the receiver
3063 * MUST send an Error Cause TLV with the error cause set to the
3064 * new error code 'Request to Delete Last Remaining IP Address'.
3065 */
42e30bf3 3066 if (asoc->peer.transport_count == 1)
1da177e4
LT		 3067 return SCTP_ERROR_DEL_LAST_IP;
3068
3069 /* ADDIP 4.3 D8) If a request is received to delete an IP
3070 * address which is also the source address of the IP packet
3071 * which contained the ASCONF chunk, the receiver MUST reject
3072 * this request. To reject the request the receiver MUST send
3073 * an Error Cause TLV set to the new error code 'Request to
3074 * Delete Source IP Address'
3075 */
b1364104 3076 if (sctp_cmp_addr_exact(&asconf->source, &addr))
1da177e4
LT		 3077 return SCTP_ERROR_DEL_SRC_IP;
3078
42e30bf3
VY		 3079 /* Section 4.2.2
3080 * If the address 0.0.0.0 or ::0 is provided, all
3081 * addresses of the peer except the source address of the
3082 * packet MUST be deleted.
3083 */
3084 if (af->is_any(&addr)) {
3085 sctp_assoc_set_primary(asoc, asconf->transport);
3086 sctp_assoc_del_nonprimary_peers(asoc,
3087 asconf->transport);
3088 } else
3089 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 3090 break;
3091 case SCTP_PARAM_SET_PRIMARY:
42e30bf3
VY		 3092 /* ADDIP Section 4.2.4
3093 * If the address 0.0.0.0 or ::0 is provided, the receiver
3094 * MAY mark the source address of the packet as its
3095 * primary.
3096 */
3097 if (af->is_any(&addr))
3098 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3099
dd86d136 3100 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4 3101 if (!peer)
945e5abc 3102 return SCTP_ERROR_DNS_FAILED;
1da177e4
LT		 3103
3104 sctp_assoc_set_primary(asoc, peer);
3105 break;
1da177e4
LT		 3106 }
3107
3108 return SCTP_ERROR_NO_ERROR;
3109}
3110
6f4c618d
WY		 3111/* Verify the ASCONF packet before we process it. */
3112int sctp_verify_asconf(const struct sctp_association *asoc,
3113 struct sctp_paramhdr *param_hdr, void *chunk_end,
3114 struct sctp_paramhdr **errp) {
3115 sctp_addip_param_t *asconf_param;
3116 union sctp_params param;
3117 int length, plen;
3118
3119 param.v = (sctp_paramhdr_t *) param_hdr;
3120 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3121 length = ntohs(param.p->length);
3122 *errp = param.p;
3123
3124 if (param.v > chunk_end - length ||
3125 length < sizeof(sctp_paramhdr_t))
3126 return 0;
3127
3128 switch (param.p->type) {
3129 case SCTP_PARAM_ADD_IP:
3130 case SCTP_PARAM_DEL_IP:
3131 case SCTP_PARAM_SET_PRIMARY:
3132 asconf_param = (sctp_addip_param_t *)param.v;
3133 plen = ntohs(asconf_param->param_hdr.length);
3134 if (plen < sizeof(sctp_addip_param_t) +
3135 sizeof(sctp_paramhdr_t))
3136 return 0;
3137 break;
3138 case SCTP_PARAM_SUCCESS_REPORT:
3139 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3140 if (length != sizeof(sctp_addip_param_t))
3141 return 0;
3142
3143 break;
3144 default:
3145 break;
3146 }
3147
3148 param.v += WORD_ROUND(length);
3149 }
3150
3151 if (param.v != chunk_end)
3152 return 0;
3153
3154 return 1;
3155}
3156
d808ad9a 3157/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 3158 * return an ASCONF_ACK chunk to be sent in response.
3159 */
3160struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3161 struct sctp_chunk *asconf)
3162{
3163 sctp_addiphdr_t *hdr;
3164 union sctp_addr_param *addr_param;
3165 sctp_addip_param_t *asconf_param;
3166 struct sctp_chunk *asconf_ack;
3167
dbc16db1 3168 __be16 err_code;
1da177e4 3169 int length = 0;
f3830ccc 3170 int chunk_len;
1da177e4
LT		 3171 __u32 serial;
3172 int all_param_pass = 1;
3173
f3830ccc 3174 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
1da177e4
LT		 3175 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3176 serial = ntohl(hdr->serial);
3177
d808ad9a 3178 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 3179 length = sizeof(sctp_addiphdr_t);
3180 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3181 chunk_len -= length;
3182
3183 /* Skip the address parameter and store a pointer to the first
7aa1b54b 3184 * asconf parameter.
d808ad9a 3185 */
6a435732 3186 length = ntohs(addr_param->p.length);
ea110733 3187 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3188 chunk_len -= length;
3189
d808ad9a 3190 /* create an ASCONF_ACK chunk.
1da177e4 3191 * Based on the definitions of parameters, we know that the size of
2cab86be 3192 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
7aa1b54b 3193 * parameters.
1da177e4 3194 */
2cab86be 3195 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
1da177e4
LT		 3196 if (!asconf_ack)
3197 goto done;
3198
3199 /* Process the TLVs contained within the ASCONF chunk. */
3200 while (chunk_len > 0) {
3201 err_code = sctp_process_asconf_param(asoc, asconf,
3202 asconf_param);
3203 /* ADDIP 4.1 A7)
3204 * If an error response is received for a TLV parameter,
3205 * all TLVs with no response before the failed TLV are
3206 * considered successful if not reported. All TLVs after
3207 * the failed response are considered unsuccessful unless
3208 * a specific success indication is present for the parameter.
3209 */
3210 if (SCTP_ERROR_NO_ERROR != err_code)
3211 all_param_pass = 0;
3212
3213 if (!all_param_pass)
3214 sctp_add_asconf_response(asconf_ack,
3215 asconf_param->crr_id, err_code,
3216 asconf_param);
3217
3218 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3219 * an IP address sends an 'Out of Resource' in its response, it
3220 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 3221 * in the ASCONF.
1da177e4
LT		 3222 */
3223 if (SCTP_ERROR_RSRC_LOW == err_code)
3224 goto done;
3225
3226 /* Move to the next ASCONF param. */
3227 length = ntohs(asconf_param->param_hdr.length);
ea110733 3228 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3229 chunk_len -= length;
3230 }
d808ad9a 3231
1da177e4
LT		 3232done:
3233 asoc->peer.addip_serial++;
3234
3235 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 3236 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 3237 */
3238 if (asconf_ack) {
1da177e4 3239 sctp_chunk_hold(asconf_ack);
a08de64d
VY		 3240 list_add_tail(&asconf_ack->transmitted_list,
3241 &asoc->asconf_ack_list);
1da177e4
LT		 3242 }
3243
3244 return asconf_ack;
3245}
3246
3247/* Process a asconf parameter that is successfully acked. */
425e0f68 3248static void sctp_asconf_param_success(struct sctp_association *asoc,
1da177e4
LT		 3249 sctp_addip_param_t *asconf_param)
3250{
3251 struct sctp_af *af;
3252 union sctp_addr addr;
3253 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3254 union sctp_addr_param *addr_param;
1da177e4 3255 struct sctp_transport *transport;
dc022a98 3256 struct sctp_sockaddr_entry *saddr;
1da177e4 3257
ea110733 3258 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
1da177e4
LT		 3259
3260 /* We have checked the packet before, so we do not check again. */
6a435732 3261 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
dd86d136 3262 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 3263
3264 switch (asconf_param->param_hdr.type) {
3265 case SCTP_PARAM_ADD_IP:
559cf710
VY		 3266 /* This is always done in BH context with a socket lock
3267 * held, so the list can not change.
3268 */
0ed90fb0 3269 local_bh_disable();
559cf710 3270 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 3271 if (sctp_cmp_addr_exact(&saddr->a, &addr))
f57d96b2 3272 saddr->state = SCTP_ADDR_SRC;
dc022a98 3273 }
0ed90fb0 3274 local_bh_enable();
3cd9749c
WY		 3275 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3276 transports) {
3cd9749c 3277 dst_release(transport->dst);
c6ef006b 3278 transport->dst = NULL;
3cd9749c 3279 }
1da177e4
LT		 3280 break;
3281 case SCTP_PARAM_DEL_IP:
0ed90fb0 3282 local_bh_disable();
425e0f68 3283 sctp_del_bind_addr(bp, &addr);
8a07eb0a
MH		 3284 if (asoc->asconf_addr_del_pending != NULL &&
3285 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3286 kfree(asoc->asconf_addr_del_pending);
3287 asoc->asconf_addr_del_pending = NULL;
3288 }
0ed90fb0 3289 local_bh_enable();
9dbc15f0
RD		 3290 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3291 transports) {
dc022a98 3292 dst_release(transport->dst);
c6ef006b 3293 transport->dst = NULL;
1da177e4
LT		 3294 }
3295 break;
3296 default:
3297 break;
3298 }
1da177e4
LT		 3299}
3300
3301/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3302 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 3303 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 3304 * ADDIP 4.1
3305 * A7) If an error response is received for a TLV parameter, all TLVs with no
3306 * response before the failed TLV are considered successful if not reported.
3307 * All TLVs after the failed response are considered unsuccessful unless a
3308 * specific success indication is present for the parameter.
3309 */
dbc16db1 3310static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 3311 sctp_addip_param_t *asconf_param,
3312 int no_err)
3313{
3314 sctp_addip_param_t *asconf_ack_param;
3315 sctp_errhdr_t *err_param;
3316 int length;
f3830ccc 3317 int asconf_ack_len;
dbc16db1 3318 __be16 err_code;
1da177e4
LT		 3319
3320 if (no_err)
3321 err_code = SCTP_ERROR_NO_ERROR;
3322 else
3323 err_code = SCTP_ERROR_REQ_REFUSED;
3324
f3830ccc
WY		 3325 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3326 sizeof(sctp_chunkhdr_t);
3327
1da177e4
LT		 3328 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3329 * the first asconf_ack parameter.
d808ad9a 3330 */
1da177e4
LT		 3331 length = sizeof(sctp_addiphdr_t);
3332 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3333 length);
3334 asconf_ack_len -= length;
3335
3336 while (asconf_ack_len > 0) {
3337 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3338 switch(asconf_ack_param->param_hdr.type) {
3339 case SCTP_PARAM_SUCCESS_REPORT:
3340 return SCTP_ERROR_NO_ERROR;
3341 case SCTP_PARAM_ERR_CAUSE:
3342 length = sizeof(sctp_addip_param_t);
ea110733 3343 err_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3344 asconf_ack_len -= length;
3345 if (asconf_ack_len > 0)
3346 return err_param->cause;
3347 else
3348 return SCTP_ERROR_INV_PARAM;
3349 break;
3350 default:
3351 return SCTP_ERROR_INV_PARAM;
3352 }
3353 }
3354
3355 length = ntohs(asconf_ack_param->param_hdr.length);
ea110733 3356 asconf_ack_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3357 asconf_ack_len -= length;
3358 }
3359
3360 return err_code;
3361}
3362
3363/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3364int sctp_process_asconf_ack(struct sctp_association *asoc,
3365 struct sctp_chunk *asconf_ack)
3366{
3367 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3368 union sctp_addr_param *addr_param;
3369 sctp_addip_param_t *asconf_param;
3370 int length = 0;
3371 int asconf_len = asconf->skb->len;
3372 int all_param_pass = 0;
3373 int no_err = 1;
3374 int retval = 0;
dbc16db1 3375 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3376
3377 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3378 * a pointer to address parameter.
d808ad9a 3379 */
1da177e4
LT		 3380 length = sizeof(sctp_addip_chunk_t);
3381 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3382 asconf_len -= length;
3383
3384 /* Skip the address parameter in the last asconf sent and store a
7aa1b54b 3385 * pointer to the first asconf parameter.
d808ad9a 3386 */
6a435732 3387 length = ntohs(addr_param->p.length);
ea110733 3388 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3389 asconf_len -= length;
3390
3391 /* ADDIP 4.1
3392 * A8) If there is no response(s) to specific TLV parameter(s), and no
3393 * failures are indicated, then all request(s) are considered
3394 * successful.
3395 */
3396 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3397 all_param_pass = 1;
3398
3399 /* Process the TLVs contained in the last sent ASCONF chunk. */
3400 while (asconf_len > 0) {
3401 if (all_param_pass)
3402 err_code = SCTP_ERROR_NO_ERROR;
3403 else {
3404 err_code = sctp_get_asconf_response(asconf_ack,
3405 asconf_param,
3406 no_err);
3407 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3408 no_err = 0;
3409 }
3410
3411 switch (err_code) {
3412 case SCTP_ERROR_NO_ERROR:
425e0f68 3413 sctp_asconf_param_success(asoc, asconf_param);
1da177e4
LT		 3414 break;
3415
3416 case SCTP_ERROR_RSRC_LOW:
3417 retval = 1;
3418 break;
3419
a987f762 3420 case SCTP_ERROR_UNKNOWN_PARAM:
1da177e4
LT		 3421 /* Disable sending this type of asconf parameter in
3422 * future.
d808ad9a 3423 */
1da177e4
LT		 3424 asoc->peer.addip_disabled_mask |=
3425 asconf_param->param_hdr.type;
3426 break;
3427
3428 case SCTP_ERROR_REQ_REFUSED:
3429 case SCTP_ERROR_DEL_LAST_IP:
3430 case SCTP_ERROR_DEL_SRC_IP:
3431 default:
3432 break;
3433 }
3434
3435 /* Skip the processed asconf parameter and move to the next
3436 * one.
d808ad9a 3437 */
1da177e4 3438 length = ntohs(asconf_param->param_hdr.length);
ea110733 3439 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3440 asconf_len -= length;
3441 }
3442
ddc4bbee 3443 if (no_err && asoc->src_out_of_asoc_ok) {
8a07eb0a 3444 asoc->src_out_of_asoc_ok = 0;
ddc4bbee
MH		 3445 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3446 }
8a07eb0a 3447
1da177e4 3448 /* Free the cached last sent asconf chunk. */
5f9646c3 3449 list_del_init(&asconf->transmitted_list);
1da177e4
LT		 3450 sctp_chunk_free(asconf);
3451 asoc->addip_last_asconf = NULL;
3452
1da177e4
LT		 3453 return retval;
3454}
3455
d808ad9a 3456/* Make a FWD TSN chunk. */
1da177e4
LT		 3457struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3458 __u32 new_cum_tsn, size_t nstreams,
3459 struct sctp_fwdtsn_skip *skiplist)
3460{
3461 struct sctp_chunk *retval = NULL;
d808ad9a 3462 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3463 struct sctp_fwdtsn_skip skip;
3464 size_t hint;
3465 int i;
3466
3467 hint = (nstreams + 1) * sizeof(__u32);
3468
1da177e4
LT		 3469 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3470
3471 if (!retval)
3472 return NULL;
3473
1da177e4
LT		 3474 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3475 retval->subh.fwdtsn_hdr =
3476 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3477
3478 for (i = 0; i < nstreams; i++) {
3479 skip.stream = skiplist[i].stream;
3480 skip.ssn = skiplist[i].ssn;
3481 sctp_addto_chunk(retval, sizeof(skip), &skip);
3482 }
3483
3484 return retval;
3485}
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