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[SCTP]: Implete SCTP-AUTH parameter processing
[linux-2.6-block.git] / net / sctp / sm_make_chunk.c
CommitLineData
1da177e4
LT		 1/* SCTP kernel reference Implementation
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 *
7 * This file is part of the SCTP kernel reference Implementation
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 *
13 * The SCTP reference implementation is free software;
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 *
19 * The SCTP reference implementation is distributed in the hope that it
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
53#include <linux/types.h>
54#include <linux/kernel.h>
55#include <linux/ip.h>
56#include <linux/ipv6.h>
57#include <linux/net.h>
58#include <linux/inet.h>
59#include <asm/scatterlist.h>
60#include <linux/crypto.h>
61#include <net/sock.h>
62
63#include <linux/skbuff.h>
64#include <linux/random.h> /* for get_random_bytes */
65#include <net/sctp/sctp.h>
66#include <net/sctp/sm.h>
67
1da177e4
LT		 68SCTP_STATIC
69struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
70 __u8 type, __u8 flags, int paylen);
71static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
72 const struct sctp_association *asoc,
73 const struct sctp_chunk *init_chunk,
74 int *cookie_len,
75 const __u8 *raw_addrs, int addrs_len);
76static int sctp_process_param(struct sctp_association *asoc,
77 union sctp_params param,
78 const union sctp_addr *peer_addr,
dd0fc66f 79 gfp_t gfp);
1da177e4
LT		 80
81/* What was the inbound interface for this chunk? */
82int sctp_chunk_iif(const struct sctp_chunk *chunk)
83{
84 struct sctp_af *af;
85 int iif = 0;
86
eddc9ec5 87 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
1da177e4
LT		 88 if (af)
89 iif = af->skb_iif(chunk->skb);
90
91 return iif;
92}
93
94/* RFC 2960 3.3.2 Initiation (INIT) (1)
95 *
96 * Note 2: The ECN capable field is reserved for future use of
97 * Explicit Congestion Notification.
98 */
99static const struct sctp_paramhdr ecap_param = {
100 SCTP_PARAM_ECN_CAPABLE,
101 __constant_htons(sizeof(struct sctp_paramhdr)),
102};
103static const struct sctp_paramhdr prsctp_param = {
104 SCTP_PARAM_FWD_TSN_SUPPORT,
105 __constant_htons(sizeof(struct sctp_paramhdr)),
106};
107
108/* A helper to initialize to initialize an op error inside a
109 * provided chunk, as most cause codes will be embedded inside an
110 * abort chunk.
111 */
5bf2db03 112void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
00f1c2df 113 size_t paylen)
1da177e4
LT		 114{
115 sctp_errhdr_t err;
1da177e4
LT		 116 __u16 len;
117
d808ad9a 118 /* Cause code constants are now defined in network order. */
1da177e4
LT		 119 err.cause = cause_code;
120 len = sizeof(sctp_errhdr_t) + paylen;
1da177e4 121 err.length = htons(len);
4a1c0107 122 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
1da177e4
LT		 123}
124
125/* 3.3.2 Initiation (INIT) (1)
126 *
127 * This chunk is used to initiate a SCTP association between two
128 * endpoints. The format of the INIT chunk is shown below:
129 *
130 * 0 1 2 3
131 * 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
132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
133 * | Type = 1 | Chunk Flags | Chunk Length |
134 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
135 * | Initiate Tag |
136 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
137 * | Advertised Receiver Window Credit (a_rwnd) |
138 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
139 * | Number of Outbound Streams | Number of Inbound Streams |
140 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
141 * | Initial TSN |
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * \ \
144 * / Optional/Variable-Length Parameters /
145 * \ \
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 *
148 *
149 * The INIT chunk contains the following parameters. Unless otherwise
150 * noted, each parameter MUST only be included once in the INIT chunk.
151 *
152 * Fixed Parameters Status
153 * ----------------------------------------------
154 * Initiate Tag Mandatory
155 * Advertised Receiver Window Credit Mandatory
156 * Number of Outbound Streams Mandatory
157 * Number of Inbound Streams Mandatory
158 * Initial TSN Mandatory
159 *
160 * Variable Parameters Status Type Value
161 * -------------------------------------------------------------
162 * IPv4 Address (Note 1) Optional 5
163 * IPv6 Address (Note 1) Optional 6
164 * Cookie Preservative Optional 9
165 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
166 * Host Name Address (Note 3) Optional 11
167 * Supported Address Types (Note 4) Optional 12
168 */
169struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
170 const struct sctp_bind_addr *bp,
dd0fc66f 171 gfp_t gfp, int vparam_len)
1da177e4
LT		 172{
173 sctp_inithdr_t init;
174 union sctp_params addrs;
175 size_t chunksize;
176 struct sctp_chunk *retval = NULL;
177 int num_types, addrs_len = 0;
178 struct sctp_sock *sp;
179 sctp_supported_addrs_param_t sat;
3dbe8656 180 __be16 types[2];
0f3fffd8 181 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 182 sctp_supported_ext_param_t ext_param;
183 int num_ext = 0;
184 __u8 extensions[3];
730fc3d0
VY		 185 sctp_paramhdr_t *auth_chunks = NULL,
186 *auth_hmacs = NULL;
1da177e4
LT		 187
188 /* RFC 2960 3.3.2 Initiation (INIT) (1)
189 *
190 * Note 1: The INIT chunks can contain multiple addresses that
191 * can be IPv4 and/or IPv6 in any combination.
192 */
193 retval = NULL;
194
195 /* Convert the provided bind address list to raw format. */
196 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
197
198 init.init_tag = htonl(asoc->c.my_vtag);
199 init.a_rwnd = htonl(asoc->rwnd);
200 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
201 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
202 init.initial_tsn = htonl(asoc->c.initial_tsn);
203
204 /* How many address types are needed? */
205 sp = sctp_sk(asoc->base.sk);
206 num_types = sp->pf->supported_addrs(sp, types);
207
208 chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
209 chunksize += sizeof(ecap_param);
131a47e3 210 if (sctp_prsctp_enable) {
1da177e4 211 chunksize += sizeof(prsctp_param);
131a47e3
VY		 212 extensions[num_ext] = SCTP_CID_FWD_TSN;
213 num_ext += 1;
214 }
215 /* ADDIP: Section 4.2.7:
216 * An implementation supporting this extension [ADDIP] MUST list
217 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
218 * INIT-ACK parameters.
131a47e3
VY		 219 */
220 if (sctp_addip_enable) {
221 extensions[num_ext] = SCTP_CID_ASCONF;
222 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
223 num_ext += 2;
224 }
225
1da177e4
LT		 226 chunksize += sizeof(aiparam);
227 chunksize += vparam_len;
228
730fc3d0
VY		 229 /* Account for AUTH related parameters */
230 if (sctp_auth_enable) {
231 /* Add random parameter length*/
232 chunksize += sizeof(asoc->c.auth_random);
233
234 /* Add HMACS parameter length if any were defined */
235 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
236 if (auth_hmacs->length)
237 chunksize += ntohs(auth_hmacs->length);
238 else
239 auth_hmacs = NULL;
240
241 /* Add CHUNKS parameter length */
242 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
243 if (auth_chunks->length)
244 chunksize += ntohs(auth_chunks->length);
245 else
246 auth_hmacs = NULL;
247
248 extensions[num_ext] = SCTP_CID_AUTH;
249 num_ext += 1;
250 }
251
131a47e3
VY		 252 /* If we have any extensions to report, account for that */
253 if (num_ext)
254 chunksize += sizeof(sctp_supported_ext_param_t) + num_ext;
255
1da177e4
LT		 256 /* RFC 2960 3.3.2 Initiation (INIT) (1)
257 *
258 * Note 3: An INIT chunk MUST NOT contain more than one Host
259 * Name address parameter. Moreover, the sender of the INIT
260 * MUST NOT combine any other address types with the Host Name
261 * address in the INIT. The receiver of INIT MUST ignore any
262 * other address types if the Host Name address parameter is
263 * present in the received INIT chunk.
264 *
265 * PLEASE DO NOT FIXME [This version does not support Host Name.]
266 */
267
268 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
269 if (!retval)
270 goto nodata;
271
272 retval->subh.init_hdr =
273 sctp_addto_chunk(retval, sizeof(init), &init);
274 retval->param_hdr.v =
275 sctp_addto_chunk(retval, addrs_len, addrs.v);
276
277 /* RFC 2960 3.3.2 Initiation (INIT) (1)
278 *
279 * Note 4: This parameter, when present, specifies all the
280 * address types the sending endpoint can support. The absence
281 * of this parameter indicates that the sending endpoint can
282 * support any address type.
283 */
284 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
285 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
286 sctp_addto_chunk(retval, sizeof(sat), &sat);
287 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
288
289 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3
VY		 290
291 /* Add the supported extensions paramter. Be nice and add this
292 * fist before addiding the parameters for the extensions themselves
293 */
294 if (num_ext) {
295 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
296 ext_param.param_hdr.length =
297 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
298 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
299 &ext_param);
300 sctp_addto_chunk(retval, num_ext, extensions);
301 }
302
1da177e4
LT		 303 if (sctp_prsctp_enable)
304 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
131a47e3 305
0f3fffd8 306 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
1da177e4 307 aiparam.param_hdr.length = htons(sizeof(aiparam));
0f3fffd8 308 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
1da177e4 309 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
131a47e3 310
730fc3d0
VY		 311 /* Add SCTP-AUTH chunks to the parameter list */
312 if (sctp_auth_enable) {
313 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
314 asoc->c.auth_random);
315 if (auth_hmacs)
316 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
317 auth_hmacs);
318 if (auth_chunks)
319 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
320 auth_chunks);
321 }
1da177e4 322nodata:
a51482bd 323 kfree(addrs.v);
1da177e4
LT		 324 return retval;
325}
326
327struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
328 const struct sctp_chunk *chunk,
dd0fc66f 329 gfp_t gfp, int unkparam_len)
1da177e4
LT		 330{
331 sctp_inithdr_t initack;
332 struct sctp_chunk *retval;
333 union sctp_params addrs;
334 int addrs_len;
335 sctp_cookie_param_t *cookie;
336 int cookie_len;
337 size_t chunksize;
0f3fffd8 338 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 339 sctp_supported_ext_param_t ext_param;
340 int num_ext = 0;
341 __u8 extensions[3];
730fc3d0
VY		 342 sctp_paramhdr_t *auth_chunks = NULL,
343 *auth_hmacs = NULL,
344 *auth_random = NULL;
1da177e4
LT		 345
346 retval = NULL;
347
348 /* Note: there may be no addresses to embed. */
349 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
350
351 initack.init_tag = htonl(asoc->c.my_vtag);
352 initack.a_rwnd = htonl(asoc->rwnd);
353 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
354 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
355 initack.initial_tsn = htonl(asoc->c.initial_tsn);
356
357 /* FIXME: We really ought to build the cookie right
358 * into the packet instead of allocating more fresh memory.
359 */
360 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
361 addrs.v, addrs_len);
362 if (!cookie)
363 goto nomem_cookie;
364
365 /* Calculate the total size of allocation, include the reserved
366 * space for reporting unknown parameters if it is specified.
367 */
368 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
369
d808ad9a 370 /* Tell peer that we'll do ECN only if peer advertised such cap. */
1da177e4
LT		 371 if (asoc->peer.ecn_capable)
372 chunksize += sizeof(ecap_param);
373
d808ad9a 374 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
131a47e3 375 if (asoc->peer.prsctp_capable) {
1da177e4 376 chunksize += sizeof(prsctp_param);
131a47e3
VY		 377 extensions[num_ext] = SCTP_CID_FWD_TSN;
378 num_ext += 1;
379 }
1da177e4 380
131a47e3
VY		 381 if (sctp_addip_enable) {
382 extensions[num_ext] = SCTP_CID_ASCONF;
383 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
384 num_ext += 2;
385 }
386
387 chunksize += sizeof(ext_param) + num_ext;
1da177e4
LT		 388 chunksize += sizeof(aiparam);
389
730fc3d0
VY		 390 if (asoc->peer.auth_capable) {
391 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
392 chunksize += ntohs(auth_random->length);
393
394 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
395 if (auth_hmacs->length)
396 chunksize += ntohs(auth_hmacs->length);
397 else
398 auth_hmacs = NULL;
399
400 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
401 if (auth_chunks->length)
402 chunksize += ntohs(auth_chunks->length);
403 else
404 auth_chunks = NULL;
405
406 extensions[num_ext] = SCTP_CID_AUTH;
407 num_ext += 1;
408 }
409
1da177e4
LT		 410 /* Now allocate and fill out the chunk. */
411 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
412 if (!retval)
413 goto nomem_chunk;
414
415 /* Per the advice in RFC 2960 6.4, send this reply to
416 * the source of the INIT packet.
417 */
418 retval->transport = chunk->transport;
419 retval->subh.init_hdr =
420 sctp_addto_chunk(retval, sizeof(initack), &initack);
421 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
422 sctp_addto_chunk(retval, cookie_len, cookie);
423 if (asoc->peer.ecn_capable)
424 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3
VY		 425 if (num_ext) {
426 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
427 ext_param.param_hdr.length =
428 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
429 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
430 &ext_param);
431 sctp_addto_chunk(retval, num_ext, extensions);
432 }
1da177e4
LT		 433 if (asoc->peer.prsctp_capable)
434 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
435
0f3fffd8 436 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
1da177e4 437 aiparam.param_hdr.length = htons(sizeof(aiparam));
0f3fffd8 438 aiparam.adaptation_ind = htonl(sctp_sk(asoc->base.sk)->adaptation_ind);
1da177e4
LT		 439 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
440
730fc3d0
VY		 441 if (asoc->peer.auth_capable) {
442 sctp_addto_chunk(retval, ntohs(auth_random->length),
443 auth_random);
444 if (auth_hmacs)
445 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
446 auth_hmacs);
447 if (auth_chunks)
448 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
449 auth_chunks);
450 }
451
1da177e4
LT		 452 /* We need to remove the const qualifier at this point. */
453 retval->asoc = (struct sctp_association *) asoc;
454
455 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
456 *
457 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
458 * HEARTBEAT ACK, * etc.) to the same destination transport
459 * address from which it received the DATA or control chunk
460 * to which it is replying.
461 *
462 * [INIT ACK back to where the INIT came from.]
463 */
464 if (chunk)
465 retval->transport = chunk->transport;
466
467nomem_chunk:
468 kfree(cookie);
469nomem_cookie:
a51482bd 470 kfree(addrs.v);
1da177e4
LT		 471 return retval;
472}
473
474/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
475 *
476 * This chunk is used only during the initialization of an association.
477 * It is sent by the initiator of an association to its peer to complete
478 * the initialization process. This chunk MUST precede any DATA chunk
479 * sent within the association, but MAY be bundled with one or more DATA
480 * chunks in the same packet.
481 *
482 * 0 1 2 3
483 * 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
484 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
485 * | Type = 10 |Chunk Flags | Length |
486 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
487 * / Cookie /
488 * \ \
489 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
490 *
491 * Chunk Flags: 8 bit
492 *
493 * Set to zero on transmit and ignored on receipt.
494 *
495 * Length: 16 bits (unsigned integer)
496 *
497 * Set to the size of the chunk in bytes, including the 4 bytes of
498 * the chunk header and the size of the Cookie.
499 *
500 * Cookie: variable size
501 *
502 * This field must contain the exact cookie received in the
503 * State Cookie parameter from the previous INIT ACK.
504 *
505 * An implementation SHOULD make the cookie as small as possible
506 * to insure interoperability.
507 */
508struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
509 const struct sctp_chunk *chunk)
510{
511 struct sctp_chunk *retval;
512 void *cookie;
513 int cookie_len;
514
515 cookie = asoc->peer.cookie;
516 cookie_len = asoc->peer.cookie_len;
517
518 /* Build a cookie echo chunk. */
519 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
520 if (!retval)
521 goto nodata;
522 retval->subh.cookie_hdr =
523 sctp_addto_chunk(retval, cookie_len, cookie);
524
525 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
526 *
527 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
528 * HEARTBEAT ACK, * etc.) to the same destination transport
529 * address from which it * received the DATA or control chunk
530 * to which it is replying.
531 *
532 * [COOKIE ECHO back to where the INIT ACK came from.]
533 */
534 if (chunk)
535 retval->transport = chunk->transport;
536
537nodata:
538 return retval;
539}
540
541/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
542 *
543 * This chunk is used only during the initialization of an
544 * association. It is used to acknowledge the receipt of a COOKIE
545 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
546 * within the association, but MAY be bundled with one or more DATA
547 * chunks or SACK chunk in the same SCTP packet.
548 *
549 * 0 1 2 3
550 * 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
551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * | Type = 11 |Chunk Flags | Length = 4 |
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 *
555 * Chunk Flags: 8 bits
556 *
557 * Set to zero on transmit and ignored on receipt.
558 */
559struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
560 const struct sctp_chunk *chunk)
561{
562 struct sctp_chunk *retval;
563
564 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
565
566 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
567 *
568 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
569 * HEARTBEAT ACK, * etc.) to the same destination transport
570 * address from which it * received the DATA or control chunk
571 * to which it is replying.
572 *
573 * [COOKIE ACK back to where the COOKIE ECHO came from.]
574 */
575 if (retval && chunk)
576 retval->transport = chunk->transport;
577
578 return retval;
579}
580
581/*
582 * Appendix A: Explicit Congestion Notification:
583 * CWR:
584 *
585 * RFC 2481 details a specific bit for a sender to send in the header of
586 * its next outbound TCP segment to indicate to its peer that it has
587 * reduced its congestion window. This is termed the CWR bit. For
588 * SCTP the same indication is made by including the CWR chunk.
589 * This chunk contains one data element, i.e. the TSN number that
590 * was sent in the ECNE chunk. This element represents the lowest
591 * TSN number in the datagram that was originally marked with the
592 * CE bit.
593 *
594 * 0 1 2 3
595 * 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
596 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
597 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
598 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
599 * | Lowest TSN Number |
600 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
601 *
602 * Note: The CWR is considered a Control chunk.
603 */
604struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
605 const __u32 lowest_tsn,
606 const struct sctp_chunk *chunk)
607{
608 struct sctp_chunk *retval;
609 sctp_cwrhdr_t cwr;
610
611 cwr.lowest_tsn = htonl(lowest_tsn);
612 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
613 sizeof(sctp_cwrhdr_t));
614
615 if (!retval)
616 goto nodata;
617
618 retval->subh.ecn_cwr_hdr =
619 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
620
621 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
622 *
623 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
624 * HEARTBEAT ACK, * etc.) to the same destination transport
625 * address from which it * received the DATA or control chunk
626 * to which it is replying.
627 *
628 * [Report a reduced congestion window back to where the ECNE
629 * came from.]
630 */
631 if (chunk)
632 retval->transport = chunk->transport;
633
634nodata:
635 return retval;
636}
637
638/* Make an ECNE chunk. This is a congestion experienced report. */
639struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
640 const __u32 lowest_tsn)
641{
642 struct sctp_chunk *retval;
643 sctp_ecnehdr_t ecne;
644
645 ecne.lowest_tsn = htonl(lowest_tsn);
646 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
647 sizeof(sctp_ecnehdr_t));
648 if (!retval)
649 goto nodata;
650 retval->subh.ecne_hdr =
651 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
652
653nodata:
654 return retval;
655}
656
657/* Make a DATA chunk for the given association from the provided
658 * parameters. However, do not populate the data payload.
659 */
660struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
661 const struct sctp_sndrcvinfo *sinfo,
662 int data_len, __u8 flags, __u16 ssn)
663{
664 struct sctp_chunk *retval;
665 struct sctp_datahdr dp;
666 int chunk_len;
667
668 /* We assign the TSN as LATE as possible, not here when
669 * creating the chunk.
670 */
671 dp.tsn = 0;
672 dp.stream = htons(sinfo->sinfo_stream);
673 dp.ppid = sinfo->sinfo_ppid;
674
675 /* Set the flags for an unordered send. */
eaa5c54d 676 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
1da177e4
LT		 677 flags |= SCTP_DATA_UNORDERED;
678 dp.ssn = 0;
679 } else
680 dp.ssn = htons(ssn);
681
682 chunk_len = sizeof(dp) + data_len;
683 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
684 if (!retval)
685 goto nodata;
686
687 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
688 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
689
690nodata:
691 return retval;
692}
693
694/* Create a selective ackowledgement (SACK) for the given
695 * association. This reports on which TSN's we've seen to date,
696 * including duplicates and gaps.
697 */
698struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
699{
700 struct sctp_chunk *retval;
701 struct sctp_sackhdr sack;
702 int len;
703 __u32 ctsn;
704 __u16 num_gabs, num_dup_tsns;
705 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
706
707 ctsn = sctp_tsnmap_get_ctsn(map);
708 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
709
710 /* How much room is needed in the chunk? */
711 num_gabs = sctp_tsnmap_num_gabs(map);
712 num_dup_tsns = sctp_tsnmap_num_dups(map);
713
714 /* Initialize the SACK header. */
715 sack.cum_tsn_ack = htonl(ctsn);
716 sack.a_rwnd = htonl(asoc->a_rwnd);
717 sack.num_gap_ack_blocks = htons(num_gabs);
718 sack.num_dup_tsns = htons(num_dup_tsns);
719
720 len = sizeof(sack)
721 + sizeof(struct sctp_gap_ack_block) * num_gabs
722 + sizeof(__u32) * num_dup_tsns;
723
724 /* Create the chunk. */
725 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
726 if (!retval)
727 goto nodata;
728
729 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
730 *
731 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
732 * HEARTBEAT ACK, etc.) to the same destination transport
733 * address from which it received the DATA or control chunk to
734 * which it is replying. This rule should also be followed if
735 * the endpoint is bundling DATA chunks together with the
736 * reply chunk.
737 *
738 * However, when acknowledging multiple DATA chunks received
739 * in packets from different source addresses in a single
740 * SACK, the SACK chunk may be transmitted to one of the
741 * destination transport addresses from which the DATA or
742 * control chunks being acknowledged were received.
743 *
744 * [BUG: We do not implement the following paragraph.
745 * Perhaps we should remember the last transport we used for a
746 * SACK and avoid that (if possible) if we have seen any
747 * duplicates. --piggy]
748 *
749 * When a receiver of a duplicate DATA chunk sends a SACK to a
750 * multi- homed endpoint it MAY be beneficial to vary the
751 * destination address and not use the source address of the
752 * DATA chunk. The reason being that receiving a duplicate
753 * from a multi-homed endpoint might indicate that the return
754 * path (as specified in the source address of the DATA chunk)
755 * for the SACK is broken.
756 *
757 * [Send to the address from which we last received a DATA chunk.]
758 */
759 retval->transport = asoc->peer.last_data_from;
760
761 retval->subh.sack_hdr =
762 sctp_addto_chunk(retval, sizeof(sack), &sack);
763
764 /* Add the gap ack block information. */
765 if (num_gabs)
766 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
767 sctp_tsnmap_get_gabs(map));
768
769 /* Add the duplicate TSN information. */
770 if (num_dup_tsns)
771 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
772 sctp_tsnmap_get_dups(map));
773
774nodata:
775 return retval;
776}
777
778/* Make a SHUTDOWN chunk. */
779struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
780 const struct sctp_chunk *chunk)
781{
782 struct sctp_chunk *retval;
783 sctp_shutdownhdr_t shut;
784 __u32 ctsn;
785
786 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
787 shut.cum_tsn_ack = htonl(ctsn);
788
789 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
790 sizeof(sctp_shutdownhdr_t));
791 if (!retval)
792 goto nodata;
793
794 retval->subh.shutdown_hdr =
795 sctp_addto_chunk(retval, sizeof(shut), &shut);
796
797 if (chunk)
798 retval->transport = chunk->transport;
799nodata:
800 return retval;
801}
802
803struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
804 const struct sctp_chunk *chunk)
805{
806 struct sctp_chunk *retval;
807
808 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
809
810 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
811 *
812 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
813 * HEARTBEAT ACK, * etc.) to the same destination transport
814 * address from which it * received the DATA or control chunk
815 * to which it is replying.
816 *
817 * [ACK back to where the SHUTDOWN came from.]
818 */
819 if (retval && chunk)
820 retval->transport = chunk->transport;
821
822 return retval;
823}
824
825struct sctp_chunk *sctp_make_shutdown_complete(
826 const struct sctp_association *asoc,
827 const struct sctp_chunk *chunk)
828{
829 struct sctp_chunk *retval;
830 __u8 flags = 0;
831
047a2428
JF		 832 /* Set the T-bit if we have no association (vtag will be
833 * reflected)
834 */
1da177e4
LT		 835 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
836
837 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
838
839 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
840 *
841 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
842 * HEARTBEAT ACK, * etc.) to the same destination transport
843 * address from which it * received the DATA or control chunk
844 * to which it is replying.
845 *
846 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
847 * came from.]
848 */
849 if (retval && chunk)
850 retval->transport = chunk->transport;
851
d808ad9a 852 return retval;
1da177e4
LT		 853}
854
855/* Create an ABORT. Note that we set the T bit if we have no
047a2428 856 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 857 */
858struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
859 const struct sctp_chunk *chunk,
860 const size_t hint)
861{
862 struct sctp_chunk *retval;
863 __u8 flags = 0;
864
047a2428
JF		 865 /* Set the T-bit if we have no association and 'chunk' is not
866 * an INIT (vtag will be reflected).
867 */
868 if (!asoc) {
869 if (chunk && chunk->chunk_hdr &&
870 chunk->chunk_hdr->type == SCTP_CID_INIT)
871 flags = 0;
872 else
873 flags = SCTP_CHUNK_FLAG_T;
874 }
1da177e4
LT		 875
876 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
877
878 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
879 *
880 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
881 * HEARTBEAT ACK, * etc.) to the same destination transport
882 * address from which it * received the DATA or control chunk
883 * to which it is replying.
884 *
885 * [ABORT back to where the offender came from.]
886 */
887 if (retval && chunk)
888 retval->transport = chunk->transport;
889
890 return retval;
891}
892
893/* Helper to create ABORT with a NO_USER_DATA error. */
894struct sctp_chunk *sctp_make_abort_no_data(
895 const struct sctp_association *asoc,
896 const struct sctp_chunk *chunk, __u32 tsn)
897{
898 struct sctp_chunk *retval;
9f81bcd9 899 __be32 payload;
1da177e4
LT		 900
901 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
902 + sizeof(tsn));
903
904 if (!retval)
905 goto no_mem;
906
907 /* Put the tsn back into network byte order. */
908 payload = htonl(tsn);
00f1c2df
WY		 909 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
910 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 911
912 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
913 *
914 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
915 * HEARTBEAT ACK, * etc.) to the same destination transport
916 * address from which it * received the DATA or control chunk
917 * to which it is replying.
918 *
919 * [ABORT back to where the offender came from.]
920 */
921 if (chunk)
922 retval->transport = chunk->transport;
923
924no_mem:
925 return retval;
926}
927
928/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
929struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 930 const struct msghdr *msg,
931 size_t paylen)
1da177e4
LT		 932{
933 struct sctp_chunk *retval;
c164a9ba
SS		 934 void *payload = NULL;
935 int err;
1da177e4 936
c164a9ba 937 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 938 if (!retval)
939 goto err_chunk;
940
941 if (paylen) {
942 /* Put the msg_iov together into payload. */
c164a9ba 943 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 944 if (!payload)
945 goto err_payload;
c164a9ba
SS		 946
947 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
948 if (err < 0)
949 goto err_copy;
1da177e4
LT		 950 }
951
00f1c2df
WY		 952 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
953 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 954
955 if (paylen)
956 kfree(payload);
957
958 return retval;
959
960err_copy:
961 kfree(payload);
962err_payload:
963 sctp_chunk_free(retval);
964 retval = NULL;
965err_chunk:
966 return retval;
967}
968
5c94bf86
AB		 969/* Append bytes to the end of a parameter. Will panic if chunk is not big
970 * enough.
971 */
972static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
973 const void *data)
974{
975 void *target;
976 int chunklen = ntohs(chunk->chunk_hdr->length);
977
978 target = skb_put(chunk->skb, len);
979
980 memcpy(target, data, len);
981
982 /* Adjust the chunk length field. */
983 chunk->chunk_hdr->length = htons(chunklen + len);
984 chunk->chunk_end = skb_tail_pointer(chunk->skb);
985
986 return target;
987}
988
d808ad9a 989/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 990struct sctp_chunk *sctp_make_abort_violation(
991 const struct sctp_association *asoc,
992 const struct sctp_chunk *chunk,
993 const __u8 *payload,
994 const size_t paylen)
995{
996 struct sctp_chunk *retval;
997 struct sctp_paramhdr phdr;
998
999 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1000 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1001 if (!retval)
1002 goto end;
1003
00f1c2df
WY		 1004 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1005 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1006
1007 phdr.type = htons(chunk->chunk_hdr->type);
1008 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1009 sctp_addto_chunk(retval, paylen, payload);
1010 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1011
1012end:
1013 return retval;
1014}
1015
1016/* Make a HEARTBEAT chunk. */
1017struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1018 const struct sctp_transport *transport,
1019 const void *payload, const size_t paylen)
1020{
1021 struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
1022 0, paylen);
1023
1024 if (!retval)
1025 goto nodata;
1026
1027 /* Cast away the 'const', as this is just telling the chunk
1028 * what transport it belongs to.
1029 */
1030 retval->transport = (struct sctp_transport *) transport;
1031 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1032
1033nodata:
1034 return retval;
1035}
1036
1037struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1038 const struct sctp_chunk *chunk,
1039 const void *payload, const size_t paylen)
1040{
1041 struct sctp_chunk *retval;
1042
1043 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1044 if (!retval)
1045 goto nodata;
1046
1047 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1048
1049 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1050 *
1051 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1052 * HEARTBEAT ACK, * etc.) to the same destination transport
1053 * address from which it * received the DATA or control chunk
1054 * to which it is replying.
1055 *
1056 * [HBACK back to where the HEARTBEAT came from.]
1057 */
1058 if (chunk)
1059 retval->transport = chunk->transport;
1060
1061nodata:
1062 return retval;
1063}
1064
1065/* Create an Operation Error chunk with the specified space reserved.
1066 * This routine can be used for containing multiple causes in the chunk.
1067 */
1068static struct sctp_chunk *sctp_make_op_error_space(
1069 const struct sctp_association *asoc,
1070 const struct sctp_chunk *chunk,
1071 size_t size)
1072{
1073 struct sctp_chunk *retval;
1074
1075 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1076 sizeof(sctp_errhdr_t) + size);
1077 if (!retval)
1078 goto nodata;
1079
1080 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1081 *
1082 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1083 * HEARTBEAT ACK, etc.) to the same destination transport
1084 * address from which it received the DATA or control chunk
1085 * to which it is replying.
1086 *
1087 */
1088 if (chunk)
1089 retval->transport = chunk->transport;
1090
1091nodata:
1092 return retval;
1093}
1094
1095/* Create an Operation Error chunk. */
1096struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1097 const struct sctp_chunk *chunk,
63706c5c 1098 __be16 cause_code, const void *payload,
1da177e4
LT		 1099 size_t paylen)
1100{
1101 struct sctp_chunk *retval;
1102
1103 retval = sctp_make_op_error_space(asoc, chunk, paylen);
1104 if (!retval)
1105 goto nodata;
1106
00f1c2df
WY		 1107 sctp_init_cause(retval, cause_code, paylen);
1108 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 1109
1110nodata:
1111 return retval;
1112}
1113
1114/********************************************************************
1115 * 2nd Level Abstractions
1116 ********************************************************************/
1117
1118/* Turn an skb into a chunk.
1119 * FIXME: Eventually move the structure directly inside the skb->cb[].
1120 */
1121struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1122 const struct sctp_association *asoc,
1123 struct sock *sk)
1124{
1125 struct sctp_chunk *retval;
1126
c3762229 1127 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1128
1129 if (!retval)
1130 goto nodata;
1da177e4
LT		 1131
1132 if (!sk) {
1133 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1134 }
1135
79af02c2 1136 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1137 retval->skb = skb;
1138 retval->asoc = (struct sctp_association *)asoc;
1139 retval->resent = 0;
1140 retval->has_tsn = 0;
1141 retval->has_ssn = 0;
1142 retval->rtt_in_progress = 0;
1143 retval->sent_at = 0;
1144 retval->singleton = 1;
1145 retval->end_of_packet = 0;
1146 retval->ecn_ce_done = 0;
1147 retval->pdiscard = 0;
1148
1149 /* sctpimpguide-05.txt Section 2.8.2
1150 * M1) Each time a new DATA chunk is transmitted
1151 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1152 * 'TSN.Missing.Report' count will be used to determine missing chunks
1153 * and when to fast retransmit.
1154 */
1155 retval->tsn_missing_report = 0;
1156 retval->tsn_gap_acked = 0;
1157 retval->fast_retransmit = 0;
1158
1159 /* If this is a fragmented message, track all fragments
1160 * of the message (for SEND_FAILED).
1161 */
1162 retval->msg = NULL;
1163
1164 /* Polish the bead hole. */
1165 INIT_LIST_HEAD(&retval->transmitted_list);
1166 INIT_LIST_HEAD(&retval->frag_list);
1167 SCTP_DBG_OBJCNT_INC(chunk);
1168 atomic_set(&retval->refcnt, 1);
1169
1170nodata:
1171 return retval;
1172}
1173
1174/* Set chunk->source and dest based on the IP header in chunk->skb. */
1175void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1176 union sctp_addr *dest)
1177{
f235fca3 1178 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1179 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1180}
1181
1182/* Extract the source address from a chunk. */
1183const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1184{
1185 /* If we have a known transport, use that. */
1186 if (chunk->transport) {
6a1e5f33 1187 return &chunk->transport->ipaddr;
1da177e4
LT		 1188 } else {
1189 /* Otherwise, extract it from the IP header. */
6a1e5f33 1190 return &chunk->source;
1da177e4
LT		 1191 }
1192}
1193
1194/* Create a new chunk, setting the type and flags headers from the
1195 * arguments, reserving enough space for a 'paylen' byte payload.
1196 */
1197SCTP_STATIC
1198struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1199 __u8 type, __u8 flags, int paylen)
1200{
1201 struct sctp_chunk *retval;
1202 sctp_chunkhdr_t *chunk_hdr;
1203 struct sk_buff *skb;
1204 struct sock *sk;
1205
1206 /* No need to allocate LL here, as this is only a chunk. */
1207 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1208 GFP_ATOMIC);
1209 if (!skb)
1210 goto nodata;
1211
1212 /* Make room for the chunk header. */
1213 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1214 chunk_hdr->type = type;
1215 chunk_hdr->flags = flags;
1216 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1217
1218 sk = asoc ? asoc->base.sk : NULL;
1219 retval = sctp_chunkify(skb, asoc, sk);
1220 if (!retval) {
1221 kfree_skb(skb);
1222 goto nodata;
1223 }
1224
1225 retval->chunk_hdr = chunk_hdr;
1226 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1227
1228 /* Set the skb to the belonging sock for accounting. */
1229 skb->sk = sk;
1230
1231 return retval;
1232nodata:
1233 return NULL;
1234}
1235
1236
1237/* Release the memory occupied by a chunk. */
1238static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1239{
1240 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1241 dev_kfree_skb(chunk->skb);
1242
1243 SCTP_DBG_OBJCNT_DEC(chunk);
1244 kmem_cache_free(sctp_chunk_cachep, chunk);
1245}
1246
1247/* Possibly, free the chunk. */
1248void sctp_chunk_free(struct sctp_chunk *chunk)
1249{
79af02c2 1250 BUG_ON(!list_empty(&chunk->list));
1da177e4
LT		 1251 list_del_init(&chunk->transmitted_list);
1252
1253 /* Release our reference on the message tracker. */
1254 if (chunk->msg)
1255 sctp_datamsg_put(chunk->msg);
1256
1257 sctp_chunk_put(chunk);
1258}
1259
1260/* Grab a reference to the chunk. */
1261void sctp_chunk_hold(struct sctp_chunk *ch)
1262{
1263 atomic_inc(&ch->refcnt);
1264}
1265
1266/* Release a reference to the chunk. */
1267void sctp_chunk_put(struct sctp_chunk *ch)
1268{
1269 if (atomic_dec_and_test(&ch->refcnt))
1270 sctp_chunk_destroy(ch);
1271}
1272
1273/* Append bytes to the end of a chunk. Will panic if chunk is not big
1274 * enough.
1275 */
1276void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1277{
1278 void *target;
1279 void *padding;
1280 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1281 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1282
1283 padding = skb_put(chunk->skb, padlen);
1284 target = skb_put(chunk->skb, len);
1285
1286 memset(padding, 0, padlen);
1287 memcpy(target, data, len);
1288
1289 /* Adjust the chunk length field. */
1290 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1291 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1292
1293 return target;
1294}
1295
1296/* Append bytes from user space to the end of a chunk. Will panic if
1297 * chunk is not big enough.
1298 * Returns a kernel err value.
1299 */
1300int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1301 struct iovec *data)
1302{
1303 __u8 *target;
1304 int err = 0;
1305
1306 /* Make room in chunk for data. */
1307 target = skb_put(chunk->skb, len);
1308
1309 /* Copy data (whole iovec) into chunk */
1310 if ((err = memcpy_fromiovecend(target, data, off, len)))
1311 goto out;
1312
1313 /* Adjust the chunk length field. */
1314 chunk->chunk_hdr->length =
1315 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1316 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1317
1318out:
1319 return err;
1320}
1321
1322/* Helper function to assign a TSN if needed. This assumes that both
1323 * the data_hdr and association have already been assigned.
1324 */
1325void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1326{
ab3e5e7b
VY		 1327 struct sctp_datamsg *msg;
1328 struct sctp_chunk *lchunk;
1329 struct sctp_stream *stream;
1da177e4
LT		 1330 __u16 ssn;
1331 __u16 sid;
1332
1333 if (chunk->has_ssn)
1334 return;
1335
ab3e5e7b
VY		 1336 /* All fragments will be on the same stream */
1337 sid = ntohs(chunk->subh.data_hdr->stream);
1338 stream = &chunk->asoc->ssnmap->out;
1da177e4 1339
ab3e5e7b
VY		 1340 /* Now assign the sequence number to the entire message.
1341 * All fragments must have the same stream sequence number.
1342 */
1343 msg = chunk->msg;
1344 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1345 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1346 ssn = 0;
1347 } else {
1348 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1349 ssn = sctp_ssn_next(stream, sid);
1350 else
1351 ssn = sctp_ssn_peek(stream, sid);
1352 }
1353
1354 lchunk->subh.data_hdr->ssn = htons(ssn);
1355 lchunk->has_ssn = 1;
1356 }
1da177e4
LT		 1357}
1358
1359/* Helper function to assign a TSN if needed. This assumes that both
1360 * the data_hdr and association have already been assigned.
1361 */
1362void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1363{
1364 if (!chunk->has_tsn) {
1365 /* This is the last possible instant to
1366 * assign a TSN.
1367 */
1368 chunk->subh.data_hdr->tsn =
1369 htonl(sctp_association_get_next_tsn(chunk->asoc));
1370 chunk->has_tsn = 1;
1371 }
1372}
1373
1374/* Create a CLOSED association to use with an incoming packet. */
1375struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1376 struct sctp_chunk *chunk,
dd0fc66f 1377 gfp_t gfp)
1da177e4
LT		 1378{
1379 struct sctp_association *asoc;
1380 struct sk_buff *skb;
1381 sctp_scope_t scope;
1382 struct sctp_af *af;
1383
1384 /* Create the bare association. */
1385 scope = sctp_scope(sctp_source(chunk));
1386 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1387 if (!asoc)
1388 goto nodata;
1389 asoc->temp = 1;
1390 skb = chunk->skb;
1391 /* Create an entry for the source address of the packet. */
eddc9ec5 1392 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1393 if (unlikely(!af))
1394 goto fail;
d55c41b1 1395 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1396nodata:
1397 return asoc;
1398
1399fail:
1400 sctp_association_free(asoc);
1401 return NULL;
1402}
1403
1404/* Build a cookie representing asoc.
1405 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1406 */
1407static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1408 const struct sctp_association *asoc,
1409 const struct sctp_chunk *init_chunk,
1410 int *cookie_len,
1411 const __u8 *raw_addrs, int addrs_len)
1412{
1413 sctp_cookie_param_t *retval;
1414 struct sctp_signed_cookie *cookie;
1415 struct scatterlist sg;
1416 int headersize, bodysize;
1417 unsigned int keylen;
1418 char *key;
1419
9834a2bb
VY		 1420 /* Header size is static data prior to the actual cookie, including
1421 * any padding.
1422 */
d808ad9a
YH		 1423 headersize = sizeof(sctp_paramhdr_t) +
1424 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1425 sizeof(struct sctp_cookie));
1da177e4
LT		 1426 bodysize = sizeof(struct sctp_cookie)
1427 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1428
1429 /* Pad out the cookie to a multiple to make the signature
1430 * functions simpler to write.
1431 */
1432 if (bodysize % SCTP_COOKIE_MULTIPLE)
1433 bodysize += SCTP_COOKIE_MULTIPLE
1434 - (bodysize % SCTP_COOKIE_MULTIPLE);
1435 *cookie_len = headersize + bodysize;
1436
1da177e4
LT		 1437 /* Clear this memory since we are sending this data structure
1438 * out on the network.
1439 */
af997d8c
ACM		 1440 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1441 if (!retval)
1442 goto nodata;
1443
1da177e4
LT		 1444 cookie = (struct sctp_signed_cookie *) retval->body;
1445
1446 /* Set up the parameter header. */
1447 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1448 retval->p.length = htons(*cookie_len);
1449
1450 /* Copy the cookie part of the association itself. */
1451 cookie->c = asoc->c;
1452 /* Save the raw address list length in the cookie. */
1453 cookie->c.raw_addr_list_len = addrs_len;
1454
1455 /* Remember PR-SCTP capability. */
1456 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1457
0f3fffd8
ISJ		 1458 /* Save adaptation indication in the cookie. */
1459 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1460
1461 /* Set an expiration time for the cookie. */
1462 do_gettimeofday(&cookie->c.expiration);
1463 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1464
1465 /* Copy the peer's init packet. */
1466 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1467 ntohs(init_chunk->chunk_hdr->length));
1468
1469 /* Copy the raw local address list of the association. */
1470 memcpy((__u8 *)&cookie->c.peer_init[0] +
1471 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1472
d808ad9a 1473 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1474 struct hash_desc desc;
1475
1da177e4
LT		 1476 /* Sign the message. */
1477 sg.page = virt_to_page(&cookie->c);
1478 sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE;
1479 sg.length = bodysize;
1480 keylen = SCTP_SECRET_SIZE;
1481 key = (char *)ep->secret_key[ep->current_key];
d808ad9a
YH		 1482 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1483 desc.flags = 0;
1da177e4 1484
1b489e11
HX		 1485 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1486 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1487 goto free_cookie;
1da177e4
LT		 1488 }
1489
1da177e4 1490 return retval;
1b489e11
HX		 1491
1492free_cookie:
1493 kfree(retval);
1494nodata:
1495 *cookie_len = 0;
1496 return NULL;
1da177e4
LT		 1497}
1498
1499/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1500struct sctp_association *sctp_unpack_cookie(
1501 const struct sctp_endpoint *ep,
1502 const struct sctp_association *asoc,
dd0fc66f 1503 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1504 int *error, struct sctp_chunk **errp)
1505{
1506 struct sctp_association *retval = NULL;
1507 struct sctp_signed_cookie *cookie;
1508 struct sctp_cookie *bear_cookie;
1509 int headersize, bodysize, fixed_size;
313e7b4d 1510 __u8 *digest = ep->digest;
1da177e4
LT		 1511 struct scatterlist sg;
1512 unsigned int keylen, len;
1513 char *key;
1514 sctp_scope_t scope;
1515 struct sk_buff *skb = chunk->skb;
a61bbcf2 1516 struct timeval tv;
1b489e11 1517 struct hash_desc desc;
1da177e4 1518
9834a2bb
VY		 1519 /* Header size is static data prior to the actual cookie, including
1520 * any padding.
1521 */
1522 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1523 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1524 sizeof(struct sctp_cookie));
1da177e4
LT		 1525 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1526 fixed_size = headersize + sizeof(struct sctp_cookie);
1527
1528 /* Verify that the chunk looks like it even has a cookie.
1529 * There must be enough room for our cookie and our peer's
1530 * INIT chunk.
1531 */
1532 len = ntohs(chunk->chunk_hdr->length);
1533 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1534 goto malformed;
1535
1536 /* Verify that the cookie has been padded out. */
1537 if (bodysize % SCTP_COOKIE_MULTIPLE)
1538 goto malformed;
1539
1540 /* Process the cookie. */
1541 cookie = chunk->subh.cookie_hdr;
1542 bear_cookie = &cookie->c;
1543
1544 if (!sctp_sk(ep->base.sk)->hmac)
1545 goto no_hmac;
1546
1547 /* Check the signature. */
1548 keylen = SCTP_SECRET_SIZE;
1549 sg.page = virt_to_page(bear_cookie);
1550 sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE;
1551 sg.length = bodysize;
1552 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1553 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1554 desc.flags = 0;
1da177e4 1555
8ca84481 1556 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1557 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1558 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1559 *error = -SCTP_IERROR_NOMEM;
1560 goto fail;
1561 }
1da177e4
LT		 1562
1563 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1564 /* Try the previous key. */
1565 key = (char *)ep->secret_key[ep->last_key];
8ca84481 1566 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1567 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1568 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1569 *error = -SCTP_IERROR_NOMEM;
1570 goto fail;
1571 }
1da177e4
LT		 1572
1573 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1574 /* Yikes! Still bad signature! */
1575 *error = -SCTP_IERROR_BAD_SIG;
1576 goto fail;
1577 }
1578 }
1579
1580no_hmac:
1581 /* IG Section 2.35.2:
1582 * 3) Compare the port numbers and the verification tag contained
1583 * within the COOKIE ECHO chunk to the actual port numbers and the
1584 * verification tag within the SCTP common header of the received
1585 * packet. If these values do not match the packet MUST be silently
1586 * discarded,
1587 */
1588 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1589 *error = -SCTP_IERROR_BAD_TAG;
1590 goto fail;
1591 }
1592
9b1dfad0 1593 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1594 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1595 *error = -SCTP_IERROR_BAD_PORTS;
1596 goto fail;
1597 }
1598
1599 /* Check to see if the cookie is stale. If there is already
1600 * an association, there is no need to check cookie's expiration
1601 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1602 * If skb has been timestamped, then use the stamp, otherwise
1603 * use current time. This introduces a small possibility that
1604 * that a cookie may be considered expired, but his would only slow
1605 * down the new association establishment instead of every packet.
1da177e4 1606 */
f236218b
VY		 1607 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1608 skb_get_timestamp(skb, &tv);
1609 else
1610 do_gettimeofday(&tv);
1611
a61bbcf2 1612 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1da177e4
LT		 1613 /*
1614 * Section 3.3.10.3 Stale Cookie Error (3)
1615 *
1616 * Cause of error
1617 * ---------------
1618 * Stale Cookie Error: Indicates the receipt of a valid State
1619 * Cookie that has expired.
1620 */
1621 len = ntohs(chunk->chunk_hdr->length);
1622 *errp = sctp_make_op_error_space(asoc, chunk, len);
1623 if (*errp) {
a61bbcf2 1624 suseconds_t usecs = (tv.tv_sec -
1da177e4 1625 bear_cookie->expiration.tv_sec) * 1000000L +
a61bbcf2 1626 tv.tv_usec - bear_cookie->expiration.tv_usec;
34bcca28 1627 __be32 n = htonl(usecs);
1da177e4 1628
1da177e4 1629 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1630 sizeof(n));
1631 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1632 *error = -SCTP_IERROR_STALE_COOKIE;
1633 } else
1634 *error = -SCTP_IERROR_NOMEM;
1635
1636 goto fail;
1637 }
1638
1639 /* Make a new base association. */
1640 scope = sctp_scope(sctp_source(chunk));
1641 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1642 if (!retval) {
1643 *error = -SCTP_IERROR_NOMEM;
1644 goto fail;
1645 }
1646
1647 /* Set up our peer's port number. */
1648 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1649
1650 /* Populate the association from the cookie. */
1651 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1652
1653 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1654 GFP_ATOMIC) < 0) {
1655 *error = -SCTP_IERROR_NOMEM;
1656 goto fail;
1657 }
1658
1659 /* Also, add the destination address. */
1660 if (list_empty(&retval->base.bind_addr.address_list)) {
16b0a030 1661 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1,
559cf710 1662 GFP_ATOMIC);
1da177e4
LT		 1663 }
1664
1665 retval->next_tsn = retval->c.initial_tsn;
1666 retval->ctsn_ack_point = retval->next_tsn - 1;
1667 retval->addip_serial = retval->c.initial_tsn;
1668 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1669 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1670 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1671
1672 /* The INIT stuff will be done by the side effects. */
1673 return retval;
1674
1675fail:
1676 if (retval)
1677 sctp_association_free(retval);
1678
1679 return NULL;
1680
1681malformed:
1682 /* Yikes! The packet is either corrupt or deliberately
1683 * malformed.
1684 */
1685 *error = -SCTP_IERROR_MALFORMED;
1686 goto fail;
1687}
1688
1689/********************************************************************
1690 * 3rd Level Abstractions
1691 ********************************************************************/
1692
1693struct __sctp_missing {
9f81bcd9
AV		 1694 __be32 num_missing;
1695 __be16 type;
1da177e4
LT		 1696} __attribute__((packed));
1697
1698/*
1699 * Report a missing mandatory parameter.
1700 */
1701static int sctp_process_missing_param(const struct sctp_association *asoc,
1702 sctp_param_t paramtype,
1703 struct sctp_chunk *chunk,
1704 struct sctp_chunk **errp)
1705{
1706 struct __sctp_missing report;
1707 __u16 len;
1708
1709 len = WORD_ROUND(sizeof(report));
1710
1711 /* Make an ERROR chunk, preparing enough room for
1712 * returning multiple unknown parameters.
1713 */
1714 if (!*errp)
1715 *errp = sctp_make_op_error_space(asoc, chunk, len);
1716
1717 if (*errp) {
1718 report.num_missing = htonl(1);
1719 report.type = paramtype;
ebdfcad4 1720 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1721 sizeof(report));
1722 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1723 }
1724
1725 /* Stop processing this chunk. */
1726 return 0;
1727}
1728
1729/* Report an Invalid Mandatory Parameter. */
1730static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1731 struct sctp_chunk *chunk,
1732 struct sctp_chunk **errp)
1733{
1734 /* Invalid Mandatory Parameter Error has no payload. */
1735
1736 if (!*errp)
1737 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1738
1739 if (*errp)
00f1c2df 1740 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1741
1742 /* Stop processing this chunk. */
1743 return 0;
1744}
1745
1746static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1747 struct sctp_paramhdr *param,
1748 const struct sctp_chunk *chunk,
1749 struct sctp_chunk **errp)
1750{
1751 char error[] = "The following parameter had invalid length:";
d808ad9a 1752 size_t payload_len = WORD_ROUND(sizeof(error)) +
1da177e4
LT		 1753 sizeof(sctp_paramhdr_t);
1754
1755
1756 /* Create an error chunk and fill it in with our payload. */
1757 if (!*errp)
1758 *errp = sctp_make_op_error_space(asoc, chunk, payload_len);
1759
1760 if (*errp) {
00f1c2df
WY		 1761 sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION,
1762 sizeof(error) + sizeof(sctp_paramhdr_t));
1763 sctp_addto_chunk(*errp, sizeof(error), error);
1764 sctp_addto_param(*errp, sizeof(sctp_paramhdr_t), param);
1da177e4
LT		 1765 }
1766
1767 return 0;
1768}
1769
1770
1771/* Do not attempt to handle the HOST_NAME parm. However, do
1772 * send back an indicator to the peer.
1773 */
1774static int sctp_process_hn_param(const struct sctp_association *asoc,
1775 union sctp_params param,
1776 struct sctp_chunk *chunk,
1777 struct sctp_chunk **errp)
1778{
1779 __u16 len = ntohs(param.p->length);
1780
1781 /* Make an ERROR chunk. */
1782 if (!*errp)
1783 *errp = sctp_make_op_error_space(asoc, chunk, len);
1784
00f1c2df
WY		 1785 if (*errp) {
1786 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1787 sctp_addto_chunk(*errp, len, param.v);
1788 }
1da177e4
LT		 1789
1790 /* Stop processing this chunk. */
1791 return 0;
1792}
1793
131a47e3
VY		 1794static void sctp_process_ext_param(struct sctp_association *asoc,
1795 union sctp_params param)
1796{
1797 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1798 int i;
1799
1800 for (i = 0; i < num_ext; i++) {
1801 switch (param.ext->chunks[i]) {
1802 case SCTP_CID_FWD_TSN:
1803 if (sctp_prsctp_enable &&
1804 !asoc->peer.prsctp_capable)
1805 asoc->peer.prsctp_capable = 1;
1806 break;
730fc3d0
VY		 1807 case SCTP_CID_AUTH:
1808 /* if the peer reports AUTH, assume that he
1809 * supports AUTH.
1810 */
1811 asoc->peer.auth_capable = 1;
1812 break;
131a47e3
VY		 1813 case SCTP_CID_ASCONF:
1814 case SCTP_CID_ASCONF_ACK:
1815 /* don't need to do anything for ASCONF */
1816 default:
1817 break;
1818 }
1819 }
1820}
1821
1da177e4
LT		 1822/* RFC 3.2.1 & the Implementers Guide 2.2.
1823 *
1824 * The Parameter Types are encoded such that the
1825 * highest-order two bits specify the action that must be
1826 * taken if the processing endpoint does not recognize the
1827 * Parameter Type.
1828 *
1829 * 00 - Stop processing this SCTP chunk and discard it,
1830 * do not process any further chunks within it.
1831 *
1832 * 01 - Stop processing this SCTP chunk and discard it,
1833 * do not process any further chunks within it, and report
1834 * the unrecognized parameter in an 'Unrecognized
1835 * Parameter Type' (in either an ERROR or in the INIT ACK).
1836 *
1837 * 10 - Skip this parameter and continue processing.
1838 *
1839 * 11 - Skip this parameter and continue processing but
1840 * report the unrecognized parameter in an
1841 * 'Unrecognized Parameter Type' (in either an ERROR or in
1842 * the INIT ACK).
1843 *
1844 * Return value:
1845 * 0 - discard the chunk
1846 * 1 - continue with the chunk
1847 */
1848static int sctp_process_unk_param(const struct sctp_association *asoc,
1849 union sctp_params param,
1850 struct sctp_chunk *chunk,
1851 struct sctp_chunk **errp)
1852{
1853 int retval = 1;
1854
1855 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
1856 case SCTP_PARAM_ACTION_DISCARD:
1857 retval = 0;
1858 break;
1859 case SCTP_PARAM_ACTION_DISCARD_ERR:
1860 retval = 0;
1861 /* Make an ERROR chunk, preparing enough room for
1862 * returning multiple unknown parameters.
1863 */
1864 if (NULL == *errp)
1865 *errp = sctp_make_op_error_space(asoc, chunk,
1866 ntohs(chunk->chunk_hdr->length));
1867
00f1c2df 1868 if (*errp) {
1da177e4 1869 sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1da177e4 1870 WORD_ROUND(ntohs(param.p->length)));
00f1c2df
WY		 1871 sctp_addto_chunk(*errp,
1872 WORD_ROUND(ntohs(param.p->length)),
1873 param.v);
1874 }
1da177e4
LT		 1875
1876 break;
1877 case SCTP_PARAM_ACTION_SKIP:
1878 break;
1879 case SCTP_PARAM_ACTION_SKIP_ERR:
1880 /* Make an ERROR chunk, preparing enough room for
1881 * returning multiple unknown parameters.
1882 */
1883 if (NULL == *errp)
1884 *errp = sctp_make_op_error_space(asoc, chunk,
1885 ntohs(chunk->chunk_hdr->length));
1886
1887 if (*errp) {
1888 sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1da177e4 1889 WORD_ROUND(ntohs(param.p->length)));
00f1c2df
WY		 1890 sctp_addto_chunk(*errp,
1891 WORD_ROUND(ntohs(param.p->length)),
1892 param.v);
1da177e4
LT		 1893 } else {
1894 /* If there is no memory for generating the ERROR
1895 * report as specified, an ABORT will be triggered
1896 * to the peer and the association won't be
1897 * established.
1898 */
1899 retval = 0;
1900 }
1901
1902 break;
1903 default:
1904 break;
1905 }
1906
1907 return retval;
1908}
1909
1910/* Find unrecognized parameters in the chunk.
1911 * Return values:
1912 * 0 - discard the chunk
1913 * 1 - continue with the chunk
1914 */
1915static int sctp_verify_param(const struct sctp_association *asoc,
1916 union sctp_params param,
1917 sctp_cid_t cid,
1918 struct sctp_chunk *chunk,
1919 struct sctp_chunk **err_chunk)
1920{
1921 int retval = 1;
1922
1923 /* FIXME - This routine is not looking at each parameter per the
1924 * chunk type, i.e., unrecognized parameters should be further
1925 * identified based on the chunk id.
1926 */
1927
1928 switch (param.p->type) {
1929 case SCTP_PARAM_IPV4_ADDRESS:
1930 case SCTP_PARAM_IPV6_ADDRESS:
1931 case SCTP_PARAM_COOKIE_PRESERVATIVE:
1932 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
1933 case SCTP_PARAM_STATE_COOKIE:
1934 case SCTP_PARAM_HEARTBEAT_INFO:
1935 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
1936 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 1937 case SCTP_PARAM_ADAPTATION_LAYER_IND:
131a47e3 1938 case SCTP_PARAM_SUPPORTED_EXT:
1da177e4
LT		 1939 break;
1940
1941 case SCTP_PARAM_HOST_NAME_ADDRESS:
1942 /* Tell the peer, we won't support this param. */
1943 return sctp_process_hn_param(asoc, param, chunk, err_chunk);
131a47e3 1944
1da177e4
LT		 1945 case SCTP_PARAM_FWD_TSN_SUPPORT:
1946 if (sctp_prsctp_enable)
1947 break;
730fc3d0
VY		 1948 goto fallthrough;
1949
1950 case SCTP_PARAM_RANDOM:
1951 if (!sctp_auth_enable)
1952 goto fallthrough;
1953
1954 /* SCTP-AUTH: Secion 6.1
1955 * If the random number is not 32 byte long the association
1956 * MUST be aborted. The ABORT chunk SHOULD contain the error
1957 * cause 'Protocol Violation'.
1958 */
1959 if (SCTP_AUTH_RANDOM_LENGTH !=
1960 ntohs(param.p->length) - sizeof(sctp_paramhdr_t))
1961 return sctp_process_inv_paramlength(asoc, param.p,
1962 chunk, err_chunk);
1963 break;
1964
1965 case SCTP_PARAM_CHUNKS:
1966 if (!sctp_auth_enable)
1967 goto fallthrough;
1968
1969 /* SCTP-AUTH: Section 3.2
1970 * The CHUNKS parameter MUST be included once in the INIT or
1971 * INIT-ACK chunk if the sender wants to receive authenticated
1972 * chunks. Its maximum length is 260 bytes.
1973 */
1974 if (260 < ntohs(param.p->length))
1975 return sctp_process_inv_paramlength(asoc, param.p,
1976 chunk, err_chunk);
1977 break;
1978
1979 case SCTP_PARAM_HMAC_ALGO:
1980 if (!sctp_auth_enable)
1981 break;
d808ad9a 1982 /* Fall Through */
730fc3d0 1983fallthrough:
1da177e4
LT		 1984 default:
1985 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1986 ntohs(param.p->type), cid);
1987 return sctp_process_unk_param(asoc, param, chunk, err_chunk);
1988
1989 break;
1990 }
1991 return retval;
1992}
1993
1994/* Verify the INIT packet before we process it. */
1995int sctp_verify_init(const struct sctp_association *asoc,
1996 sctp_cid_t cid,
1997 sctp_init_chunk_t *peer_init,
1998 struct sctp_chunk *chunk,
1999 struct sctp_chunk **errp)
2000{
2001 union sctp_params param;
2002 int has_cookie = 0;
2003
2004 /* Verify stream values are non-zero. */
2005 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
d023f629
VY		 2006 (0 == peer_init->init_hdr.num_inbound_streams) ||
2007 (0 == peer_init->init_hdr.init_tag) ||
2008 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
1da177e4
LT		 2009
2010 sctp_process_inv_mandatory(asoc, chunk, errp);
2011 return 0;
2012 }
2013
2014 /* Check for missing mandatory parameters. */
2015 sctp_walk_params(param, peer_init, init_hdr.params) {
2016
2017 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2018 has_cookie = 1;
2019
2020 } /* for (loop through all parameters) */
2021
2022 /* There is a possibility that a parameter length was bad and
2023 * in that case we would have stoped walking the parameters.
2024 * The current param.p would point at the bad one.
2025 * Current consensus on the mailing list is to generate a PROTOCOL
2026 * VIOLATION error. We build the ERROR chunk here and let the normal
2027 * error handling code build and send the packet.
2028 */
cb243a1a 2029 if (param.v != (void*)chunk->chunk_end) {
1da177e4
LT		 2030 sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2031 return 0;
2032 }
2033
2034 /* The only missing mandatory param possible today is
2035 * the state cookie for an INIT-ACK chunk.
2036 */
2037 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) {
2038 sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2039 chunk, errp);
2040 return 0;
2041 }
2042
2043 /* Find unrecognized parameters. */
2044
2045 sctp_walk_params(param, peer_init, init_hdr.params) {
2046
2047 if (!sctp_verify_param(asoc, param, cid, chunk, errp)) {
2048 if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type)
2049 return 0;
2050 else
2051 return 1;
2052 }
2053
2054 } /* for (loop through all parameters) */
2055
2056 return 1;
2057}
2058
2059/* Unpack the parameters in an INIT packet into an association.
2060 * Returns 0 on failure, else success.
2061 * FIXME: This is an association method.
2062 */
2063int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
2064 const union sctp_addr *peer_addr,
dd0fc66f 2065 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4
LT		 2066{
2067 union sctp_params param;
2068 struct sctp_transport *transport;
2069 struct list_head *pos, *temp;
2070 char *cookie;
2071
2072 /* We must include the address that the INIT packet came from.
2073 * This is the only address that matters for an INIT packet.
2074 * When processing a COOKIE ECHO, we retrieve the from address
2075 * of the INIT from the cookie.
2076 */
2077
2078 /* This implementation defaults to making the first transport
2079 * added as the primary transport. The source address seems to
2080 * be a a better choice than any of the embedded addresses.
2081 */
4bdf4b5f 2082 if (peer_addr) {
6a1e5f33 2083 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
1da177e4 2084 goto nomem;
4bdf4b5f 2085 }
1da177e4
LT		 2086
2087 /* Process the initialization parameters. */
1da177e4
LT		 2088 sctp_walk_params(param, peer_init, init_hdr.params) {
2089
2090 if (!sctp_process_param(asoc, param, peer_addr, gfp))
d808ad9a 2091 goto clean_up;
1da177e4
LT		 2092 }
2093
730fc3d0
VY		 2094 /* AUTH: After processing the parameters, make sure that we
2095 * have all the required info to potentially do authentications.
2096 */
2097 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2098 !asoc->peer.peer_hmacs))
2099 asoc->peer.auth_capable = 0;
2100
3f7a87d2
FF		 2101 /* Walk list of transports, removing transports in the UNKNOWN state. */
2102 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2103 transport = list_entry(pos, struct sctp_transport, transports);
2104 if (transport->state == SCTP_UNKNOWN) {
2105 sctp_assoc_rm_peer(asoc, transport);
2106 }
2107 }
2108
1da177e4
LT		 2109 /* The fixed INIT headers are always in network byte
2110 * order.
2111 */
2112 asoc->peer.i.init_tag =
2113 ntohl(peer_init->init_hdr.init_tag);
2114 asoc->peer.i.a_rwnd =
2115 ntohl(peer_init->init_hdr.a_rwnd);
2116 asoc->peer.i.num_outbound_streams =
2117 ntohs(peer_init->init_hdr.num_outbound_streams);
2118 asoc->peer.i.num_inbound_streams =
2119 ntohs(peer_init->init_hdr.num_inbound_streams);
2120 asoc->peer.i.initial_tsn =
2121 ntohl(peer_init->init_hdr.initial_tsn);
2122
2123 /* Apply the upper bounds for output streams based on peer's
2124 * number of inbound streams.
2125 */
2126 if (asoc->c.sinit_num_ostreams >
2127 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2128 asoc->c.sinit_num_ostreams =
2129 ntohs(peer_init->init_hdr.num_inbound_streams);
2130 }
2131
2132 if (asoc->c.sinit_max_instreams >
2133 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2134 asoc->c.sinit_max_instreams =
2135 ntohs(peer_init->init_hdr.num_outbound_streams);
2136 }
2137
2138 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2139 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2140
2141 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2142 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2143
2144 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2145 cookie = asoc->peer.cookie;
2146 if (cookie) {
af997d8c 2147 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
1da177e4
LT		 2148 if (!asoc->peer.cookie)
2149 goto clean_up;
1da177e4
LT		 2150 }
2151
2152 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2153 * high (for example, implementations MAY use the size of the receiver
2154 * advertised window).
2155 */
2156 list_for_each(pos, &asoc->peer.transport_addr_list) {
2157 transport = list_entry(pos, struct sctp_transport, transports);
2158 transport->ssthresh = asoc->peer.i.a_rwnd;
2159 }
2160
2161 /* Set up the TSN tracking pieces. */
2162 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
2163 asoc->peer.i.initial_tsn);
2164
2165 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2166 *
2167 * The stream sequence number in all the streams shall start
2168 * from 0 when the association is established. Also, when the
2169 * stream sequence number reaches the value 65535 the next
2170 * stream sequence number shall be set to 0.
2171 */
2172
3f7a87d2 2173 /* Allocate storage for the negotiated streams if it is not a temporary
d808ad9a 2174 * association.
1da177e4
LT		 2175 */
2176 if (!asoc->temp) {
1da177e4
LT		 2177 int error;
2178
2179 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2180 asoc->c.sinit_num_ostreams, gfp);
2181 if (!asoc->ssnmap)
2182 goto clean_up;
2183
07d93967
VY		 2184 error = sctp_assoc_set_id(asoc, gfp);
2185 if (error)
1da177e4 2186 goto clean_up;
1da177e4
LT		 2187 }
2188
2189 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2190 *
2191 * When an endpoint has an ASCONF signaled change to be sent to the
2192 * remote endpoint it should do the following:
2193 * ...
2194 * A2) A serial number should be assigned to the Chunk. The serial
2195 * number should be a monotonically increasing number. All serial
2196 * numbers are defined to be initialized at the start of the
2197 * association to the same value as the Initial TSN.
2198 */
2199 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2200 return 1;
2201
2202clean_up:
2203 /* Release the transport structures. */
2204 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2205 transport = list_entry(pos, struct sctp_transport, transports);
2206 list_del_init(pos);
2207 sctp_transport_free(transport);
2208 }
3f7a87d2
FF		 2209
2210 asoc->peer.transport_count = 0;
2211
1da177e4
LT		 2212nomem:
2213 return 0;
2214}
2215
2216
2217/* Update asoc with the option described in param.
2218 *
2219 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2220 *
2221 * asoc is the association to update.
2222 * param is the variable length parameter to use for update.
2223 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2224 * If the current packet is an INIT we want to minimize the amount of
2225 * work we do. In particular, we should not build transport
2226 * structures for the addresses.
2227 */
2228static int sctp_process_param(struct sctp_association *asoc,
2229 union sctp_params param,
2230 const union sctp_addr *peer_addr,
dd0fc66f 2231 gfp_t gfp)
1da177e4
LT		 2232{
2233 union sctp_addr addr;
2234 int i;
2235 __u16 sat;
2236 int retval = 1;
2237 sctp_scope_t scope;
2238 time_t stale;
2239 struct sctp_af *af;
2240
2241 /* We maintain all INIT parameters in network byte order all the
2242 * time. This allows us to not worry about whether the parameters
2243 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2244 */
2245 switch (param.p->type) {
2246 case SCTP_PARAM_IPV6_ADDRESS:
2247 if (PF_INET6 != asoc->base.sk->sk_family)
2248 break;
2249 /* Fall through. */
2250 case SCTP_PARAM_IPV4_ADDRESS:
2251 af = sctp_get_af_specific(param_type2af(param.p->type));
dd86d136 2252 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
1da177e4 2253 scope = sctp_scope(peer_addr);
dd86d136
AV		 2254 if (sctp_in_scope(&addr, scope))
2255 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2256 return 0;
2257 break;
2258
2259 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2260 if (!sctp_cookie_preserve_enable)
2261 break;
2262
2263 stale = ntohl(param.life->lifespan_increment);
2264
2265 /* Suggested Cookie Life span increment's unit is msec,
2266 * (1/1000sec).
2267 */
2268 asoc->cookie_life.tv_sec += stale / 1000;
2269 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2270 break;
2271
2272 case SCTP_PARAM_HOST_NAME_ADDRESS:
2273 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2274 break;
2275
2276 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2277 /* Turn off the default values first so we'll know which
2278 * ones are really set by the peer.
2279 */
2280 asoc->peer.ipv4_address = 0;
2281 asoc->peer.ipv6_address = 0;
2282
2283 /* Cycle through address types; avoid divide by 0. */
2284 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2285 if (sat)
2286 sat /= sizeof(__u16);
2287
2288 for (i = 0; i < sat; ++i) {
2289 switch (param.sat->types[i]) {
2290 case SCTP_PARAM_IPV4_ADDRESS:
2291 asoc->peer.ipv4_address = 1;
2292 break;
2293
2294 case SCTP_PARAM_IPV6_ADDRESS:
2295 asoc->peer.ipv6_address = 1;
2296 break;
2297
2298 case SCTP_PARAM_HOST_NAME_ADDRESS:
2299 asoc->peer.hostname_address = 1;
2300 break;
2301
2302 default: /* Just ignore anything else. */
2303 break;
3ff50b79 2304 }
1da177e4
LT		 2305 }
2306 break;
2307
2308 case SCTP_PARAM_STATE_COOKIE:
2309 asoc->peer.cookie_len =
2310 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2311 asoc->peer.cookie = param.cookie->body;
2312 break;
2313
2314 case SCTP_PARAM_HEARTBEAT_INFO:
2315 /* Would be odd to receive, but it causes no problems. */
2316 break;
2317
2318 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2319 /* Rejected during verify stage. */
2320 break;
2321
2322 case SCTP_PARAM_ECN_CAPABLE:
2323 asoc->peer.ecn_capable = 1;
2324 break;
2325
0f3fffd8
ISJ		 2326 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2327 asoc->peer.adaptation_ind = param.aind->adaptation_ind;
1da177e4
LT		 2328 break;
2329
131a47e3
VY		 2330 case SCTP_PARAM_SUPPORTED_EXT:
2331 sctp_process_ext_param(asoc, param);
2332 break;
2333
1da177e4
LT		 2334 case SCTP_PARAM_FWD_TSN_SUPPORT:
2335 if (sctp_prsctp_enable) {
2336 asoc->peer.prsctp_capable = 1;
2337 break;
2338 }
d808ad9a 2339 /* Fall Through */
730fc3d0
VY		 2340 goto fall_through;
2341
2342 case SCTP_PARAM_RANDOM:
2343 if (!sctp_auth_enable)
2344 goto fall_through;
2345
2346 /* Save peer's random parameter */
2347 asoc->peer.peer_random = kmemdup(param.p,
2348 ntohs(param.p->length), gfp);
2349 if (!asoc->peer.peer_random) {
2350 retval = 0;
2351 break;
2352 }
2353 break;
2354
2355 case SCTP_PARAM_HMAC_ALGO:
2356 if (!sctp_auth_enable)
2357 goto fall_through;
2358
2359 /* Save peer's HMAC list */
2360 asoc->peer.peer_hmacs = kmemdup(param.p,
2361 ntohs(param.p->length), gfp);
2362 if (!asoc->peer.peer_hmacs) {
2363 retval = 0;
2364 break;
2365 }
2366
2367 /* Set the default HMAC the peer requested*/
2368 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2369 break;
2370
2371 case SCTP_PARAM_CHUNKS:
2372 if (!sctp_auth_enable)
2373 goto fall_through;
2374
2375 asoc->peer.peer_chunks = kmemdup(param.p,
2376 ntohs(param.p->length), gfp);
2377 if (!asoc->peer.peer_chunks)
2378 retval = 0;
2379 break;
2380fall_through:
1da177e4
LT		 2381 default:
2382 /* Any unrecognized parameters should have been caught
2383 * and handled by sctp_verify_param() which should be
2384 * called prior to this routine. Simply log the error
2385 * here.
2386 */
2387 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2388 ntohs(param.p->type), asoc);
2389 break;
3ff50b79 2390 }
1da177e4
LT		 2391
2392 return retval;
2393}
2394
2395/* Select a new verification tag. */
2396__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2397{
2398 /* I believe that this random number generator complies with RFC1750.
2399 * A tag of 0 is reserved for special cases (e.g. INIT).
2400 */
2401 __u32 x;
2402
2403 do {
2404 get_random_bytes(&x, sizeof(__u32));
2405 } while (x == 0);
2406
2407 return x;
2408}
2409
2410/* Select an initial TSN to send during startup. */
2411__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2412{
2413 __u32 retval;
2414
2415 get_random_bytes(&retval, sizeof(__u32));
2416 return retval;
2417}
2418
2419/*
2420 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2421 * 0 1 2 3
2422 * 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
2423 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2424 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2425 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2426 * | Serial Number |
2427 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2428 * | Address Parameter |
2429 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2430 * | ASCONF Parameter #1 |
2431 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2432 * \ \
2433 * / .... /
2434 * \ \
2435 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2436 * | ASCONF Parameter #N |
2437 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2438 *
d808ad9a 2439 * Address Parameter and other parameter will not be wrapped in this function
1da177e4
LT		 2440 */
2441static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2442 union sctp_addr *addr,
2443 int vparam_len)
2444{
2445 sctp_addiphdr_t asconf;
2446 struct sctp_chunk *retval;
2447 int length = sizeof(asconf) + vparam_len;
2448 union sctp_addr_param addrparam;
2449 int addrlen;
2450 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2451
2452 addrlen = af->to_addr_param(addr, &addrparam);
2453 if (!addrlen)
2454 return NULL;
2455 length += addrlen;
2456
2457 /* Create the chunk. */
2458 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2459 if (!retval)
2460 return NULL;
2461
2462 asconf.serial = htonl(asoc->addip_serial++);
2463
2464 retval->subh.addip_hdr =
2465 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2466 retval->param_hdr.v =
2467 sctp_addto_chunk(retval, addrlen, &addrparam);
2468
2469 return retval;
2470}
2471
2472/* ADDIP
2473 * 3.2.1 Add IP Address
2474 * 0 1 2 3
2475 * 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
2476 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2477 * | Type = 0xC001 | Length = Variable |
2478 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2479 * | ASCONF-Request Correlation ID |
2480 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2481 * | Address Parameter |
2482 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2483 *
2484 * 3.2.2 Delete IP Address
2485 * 0 1 2 3
2486 * 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
2487 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2488 * | Type = 0xC002 | Length = Variable |
2489 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2490 * | ASCONF-Request Correlation ID |
2491 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2492 * | Address Parameter |
2493 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2494 *
2495 */
2496struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2497 union sctp_addr *laddr,
2498 struct sockaddr *addrs,
2499 int addrcnt,
dbc16db1 2500 __be16 flags)
1da177e4
LT		 2501{
2502 sctp_addip_param_t param;
2503 struct sctp_chunk *retval;
2504 union sctp_addr_param addr_param;
2505 union sctp_addr *addr;
2506 void *addr_buf;
2507 struct sctp_af *af;
2508 int paramlen = sizeof(param);
2509 int addr_param_len = 0;
2510 int totallen = 0;
2511 int i;
2512
2513 /* Get total length of all the address parameters. */
2514 addr_buf = addrs;
2515 for (i = 0; i < addrcnt; i++) {
2516 addr = (union sctp_addr *)addr_buf;
2517 af = sctp_get_af_specific(addr->v4.sin_family);
2518 addr_param_len = af->to_addr_param(addr, &addr_param);
2519
2520 totallen += paramlen;
2521 totallen += addr_param_len;
2522
2523 addr_buf += af->sockaddr_len;
2524 }
2525
2526 /* Create an asconf chunk with the required length. */
2527 retval = sctp_make_asconf(asoc, laddr, totallen);
2528 if (!retval)
2529 return NULL;
2530
2531 /* Add the address parameters to the asconf chunk. */
2532 addr_buf = addrs;
2533 for (i = 0; i < addrcnt; i++) {
2534 addr = (union sctp_addr *)addr_buf;
2535 af = sctp_get_af_specific(addr->v4.sin_family);
2536 addr_param_len = af->to_addr_param(addr, &addr_param);
2537 param.param_hdr.type = flags;
2538 param.param_hdr.length = htons(paramlen + addr_param_len);
2539 param.crr_id = i;
2540
2541 sctp_addto_chunk(retval, paramlen, &param);
2542 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2543
2544 addr_buf += af->sockaddr_len;
2545 }
2546 return retval;
2547}
2548
2549/* ADDIP
2550 * 3.2.4 Set Primary IP Address
2551 * 0 1 2 3
2552 * 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
2553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2554 * | Type =0xC004 | Length = Variable |
2555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2556 * | ASCONF-Request Correlation ID |
2557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2558 * | Address Parameter |
2559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2560 *
d808ad9a 2561 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2562 */
2563struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2564 union sctp_addr *addr)
2565{
2566 sctp_addip_param_t param;
2567 struct sctp_chunk *retval;
2568 int len = sizeof(param);
2569 union sctp_addr_param addrparam;
2570 int addrlen;
2571 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2572
2573 addrlen = af->to_addr_param(addr, &addrparam);
2574 if (!addrlen)
2575 return NULL;
2576 len += addrlen;
2577
2578 /* Create the chunk and make asconf header. */
2579 retval = sctp_make_asconf(asoc, addr, len);
2580 if (!retval)
2581 return NULL;
2582
2583 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2584 param.param_hdr.length = htons(len);
2585 param.crr_id = 0;
2586
2587 sctp_addto_chunk(retval, sizeof(param), &param);
2588 sctp_addto_chunk(retval, addrlen, &addrparam);
2589
2590 return retval;
2591}
2592
2593/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2594 * 0 1 2 3
2595 * 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
2596 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2597 * | Type = 0x80 | Chunk Flags | Chunk Length |
2598 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2599 * | Serial Number |
2600 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2601 * | ASCONF Parameter Response#1 |
2602 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2603 * \ \
2604 * / .... /
2605 * \ \
2606 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2607 * | ASCONF Parameter Response#N |
2608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2609 *
d808ad9a 2610 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2611 */
2612static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2613 __u32 serial, int vparam_len)
2614{
2615 sctp_addiphdr_t asconf;
2616 struct sctp_chunk *retval;
2617 int length = sizeof(asconf) + vparam_len;
2618
2619 /* Create the chunk. */
2620 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2621 if (!retval)
2622 return NULL;
2623
2624 asconf.serial = htonl(serial);
2625
2626 retval->subh.addip_hdr =
2627 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2628
2629 return retval;
2630}
2631
2632/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2633static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2634 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2635{
2636 sctp_addip_param_t ack_param;
2637 sctp_errhdr_t err_param;
2638 int asconf_param_len = 0;
2639 int err_param_len = 0;
dbc16db1 2640 __be16 response_type;
1da177e4
LT		 2641
2642 if (SCTP_ERROR_NO_ERROR == err_code) {
2643 response_type = SCTP_PARAM_SUCCESS_REPORT;
2644 } else {
2645 response_type = SCTP_PARAM_ERR_CAUSE;
2646 err_param_len = sizeof(err_param);
2647 if (asconf_param)
2648 asconf_param_len =
2649 ntohs(asconf_param->param_hdr.length);
2650 }
2651
d808ad9a 2652 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2653 ack_param.param_hdr.type = response_type;
2654 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2655 err_param_len +
2656 asconf_param_len);
2657 ack_param.crr_id = crr_id;
2658 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2659
2660 if (SCTP_ERROR_NO_ERROR == err_code)
2661 return;
2662
2663 /* Add Error Cause parameter. */
2664 err_param.cause = err_code;
2665 err_param.length = htons(err_param_len + asconf_param_len);
2666 sctp_addto_chunk(chunk, err_param_len, &err_param);
2667
2668 /* Add the failed TLV copied from ASCONF chunk. */
2669 if (asconf_param)
2670 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2671}
2672
2673/* Process a asconf parameter. */
dbc16db1 2674static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2675 struct sctp_chunk *asconf,
2676 sctp_addip_param_t *asconf_param)
2677{
2678 struct sctp_transport *peer;
2679 struct sctp_af *af;
2680 union sctp_addr addr;
2681 struct list_head *pos;
2682 union sctp_addr_param *addr_param;
5f242a13 2683
1da177e4
LT		 2684 addr_param = (union sctp_addr_param *)
2685 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2686
2687 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2688 if (unlikely(!af))
2689 return SCTP_ERROR_INV_PARAM;
2690
dd86d136 2691 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
1da177e4
LT		 2692 switch (asconf_param->param_hdr.type) {
2693 case SCTP_PARAM_ADD_IP:
2694 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 2695 * request and does not have the local resources to add this
2696 * new address to the association, it MUST return an Error
2697 * Cause TLV set to the new error code 'Operation Refused
2698 * Due to Resource Shortage'.
2699 */
1da177e4 2700
dd86d136 2701 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 2702 if (!peer)
2703 return SCTP_ERROR_RSRC_LOW;
2704
2705 /* Start the heartbeat timer. */
2706 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2707 sctp_transport_hold(peer);
2708 break;
2709 case SCTP_PARAM_DEL_IP:
2710 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 2711 * last remaining IP address of a peer endpoint, the receiver
2712 * MUST send an Error Cause TLV with the error cause set to the
2713 * new error code 'Request to Delete Last Remaining IP Address'.
2714 */
1da177e4
LT		 2715 pos = asoc->peer.transport_addr_list.next;
2716 if (pos->next == &asoc->peer.transport_addr_list)
2717 return SCTP_ERROR_DEL_LAST_IP;
2718
2719 /* ADDIP 4.3 D8) If a request is received to delete an IP
2720 * address which is also the source address of the IP packet
2721 * which contained the ASCONF chunk, the receiver MUST reject
2722 * this request. To reject the request the receiver MUST send
2723 * an Error Cause TLV set to the new error code 'Request to
2724 * Delete Source IP Address'
2725 */
6a1e5f33 2726 if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
1da177e4
LT		 2727 return SCTP_ERROR_DEL_SRC_IP;
2728
dd86d136 2729 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 2730 break;
2731 case SCTP_PARAM_SET_PRIMARY:
dd86d136 2732 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4
LT		 2733 if (!peer)
2734 return SCTP_ERROR_INV_PARAM;
2735
2736 sctp_assoc_set_primary(asoc, peer);
2737 break;
2738 default:
2739 return SCTP_ERROR_INV_PARAM;
2740 break;
2741 }
2742
2743 return SCTP_ERROR_NO_ERROR;
2744}
2745
6f4c618d
WY		 2746/* Verify the ASCONF packet before we process it. */
2747int sctp_verify_asconf(const struct sctp_association *asoc,
2748 struct sctp_paramhdr *param_hdr, void *chunk_end,
2749 struct sctp_paramhdr **errp) {
2750 sctp_addip_param_t *asconf_param;
2751 union sctp_params param;
2752 int length, plen;
2753
2754 param.v = (sctp_paramhdr_t *) param_hdr;
2755 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
2756 length = ntohs(param.p->length);
2757 *errp = param.p;
2758
2759 if (param.v > chunk_end - length ||
2760 length < sizeof(sctp_paramhdr_t))
2761 return 0;
2762
2763 switch (param.p->type) {
2764 case SCTP_PARAM_ADD_IP:
2765 case SCTP_PARAM_DEL_IP:
2766 case SCTP_PARAM_SET_PRIMARY:
2767 asconf_param = (sctp_addip_param_t *)param.v;
2768 plen = ntohs(asconf_param->param_hdr.length);
2769 if (plen < sizeof(sctp_addip_param_t) +
2770 sizeof(sctp_paramhdr_t))
2771 return 0;
2772 break;
2773 case SCTP_PARAM_SUCCESS_REPORT:
2774 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2775 if (length != sizeof(sctp_addip_param_t))
2776 return 0;
2777
2778 break;
2779 default:
2780 break;
2781 }
2782
2783 param.v += WORD_ROUND(length);
2784 }
2785
2786 if (param.v != chunk_end)
2787 return 0;
2788
2789 return 1;
2790}
2791
d808ad9a 2792/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 2793 * return an ASCONF_ACK chunk to be sent in response.
2794 */
2795struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
2796 struct sctp_chunk *asconf)
2797{
2798 sctp_addiphdr_t *hdr;
2799 union sctp_addr_param *addr_param;
2800 sctp_addip_param_t *asconf_param;
2801 struct sctp_chunk *asconf_ack;
2802
dbc16db1 2803 __be16 err_code;
1da177e4
LT		 2804 int length = 0;
2805 int chunk_len = asconf->skb->len;
2806 __u32 serial;
2807 int all_param_pass = 1;
2808
2809 hdr = (sctp_addiphdr_t *)asconf->skb->data;
2810 serial = ntohl(hdr->serial);
2811
d808ad9a 2812 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 2813 length = sizeof(sctp_addiphdr_t);
2814 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
2815 chunk_len -= length;
2816
2817 /* Skip the address parameter and store a pointer to the first
2818 * asconf paramter.
d808ad9a 2819 */
1da177e4
LT		 2820 length = ntohs(addr_param->v4.param_hdr.length);
2821 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
2822 chunk_len -= length;
2823
d808ad9a 2824 /* create an ASCONF_ACK chunk.
1da177e4
LT		 2825 * Based on the definitions of parameters, we know that the size of
2826 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2827 * paramters.
2828 */
2829 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
2830 if (!asconf_ack)
2831 goto done;
2832
2833 /* Process the TLVs contained within the ASCONF chunk. */
2834 while (chunk_len > 0) {
2835 err_code = sctp_process_asconf_param(asoc, asconf,
2836 asconf_param);
2837 /* ADDIP 4.1 A7)
2838 * If an error response is received for a TLV parameter,
2839 * all TLVs with no response before the failed TLV are
2840 * considered successful if not reported. All TLVs after
2841 * the failed response are considered unsuccessful unless
2842 * a specific success indication is present for the parameter.
2843 */
2844 if (SCTP_ERROR_NO_ERROR != err_code)
2845 all_param_pass = 0;
2846
2847 if (!all_param_pass)
2848 sctp_add_asconf_response(asconf_ack,
2849 asconf_param->crr_id, err_code,
2850 asconf_param);
2851
2852 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2853 * an IP address sends an 'Out of Resource' in its response, it
2854 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 2855 * in the ASCONF.
1da177e4
LT		 2856 */
2857 if (SCTP_ERROR_RSRC_LOW == err_code)
2858 goto done;
2859
2860 /* Move to the next ASCONF param. */
2861 length = ntohs(asconf_param->param_hdr.length);
2862 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
2863 length);
2864 chunk_len -= length;
2865 }
d808ad9a 2866
1da177e4
LT		 2867done:
2868 asoc->peer.addip_serial++;
2869
2870 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 2871 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 2872 */
2873 if (asconf_ack) {
2874 if (asoc->addip_last_asconf_ack)
2875 sctp_chunk_free(asoc->addip_last_asconf_ack);
2876
2877 sctp_chunk_hold(asconf_ack);
2878 asoc->addip_last_asconf_ack = asconf_ack;
2879 }
2880
2881 return asconf_ack;
2882}
2883
2884/* Process a asconf parameter that is successfully acked. */
2885static int sctp_asconf_param_success(struct sctp_association *asoc,
2886 sctp_addip_param_t *asconf_param)
2887{
2888 struct sctp_af *af;
2889 union sctp_addr addr;
2890 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
2891 union sctp_addr_param *addr_param;
2892 struct list_head *pos;
2893 struct sctp_transport *transport;
dc022a98 2894 struct sctp_sockaddr_entry *saddr;
1da177e4
LT		 2895 int retval = 0;
2896
2897 addr_param = (union sctp_addr_param *)
2898 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2899
2900 /* We have checked the packet before, so we do not check again. */
2901 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
dd86d136 2902 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 2903
2904 switch (asconf_param->param_hdr.type) {
2905 case SCTP_PARAM_ADD_IP:
559cf710
VY		 2906 /* This is always done in BH context with a socket lock
2907 * held, so the list can not change.
2908 */
2909 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 2910 if (sctp_cmp_addr_exact(&saddr->a, &addr))
dc022a98
SS		 2911 saddr->use_as_src = 1;
2912 }
1da177e4
LT		 2913 break;
2914 case SCTP_PARAM_DEL_IP:
559cf710 2915 retval = sctp_del_bind_addr(bp, &addr, call_rcu_bh);
1da177e4
LT		 2916 list_for_each(pos, &asoc->peer.transport_addr_list) {
2917 transport = list_entry(pos, struct sctp_transport,
2918 transports);
dc022a98 2919 dst_release(transport->dst);
1da177e4
LT		 2920 sctp_transport_route(transport, NULL,
2921 sctp_sk(asoc->base.sk));
2922 }
2923 break;
2924 default:
2925 break;
2926 }
2927
2928 return retval;
2929}
2930
2931/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2932 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 2933 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 2934 * ADDIP 4.1
2935 * A7) If an error response is received for a TLV parameter, all TLVs with no
2936 * response before the failed TLV are considered successful if not reported.
2937 * All TLVs after the failed response are considered unsuccessful unless a
2938 * specific success indication is present for the parameter.
2939 */
dbc16db1 2940static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 2941 sctp_addip_param_t *asconf_param,
2942 int no_err)
2943{
2944 sctp_addip_param_t *asconf_ack_param;
2945 sctp_errhdr_t *err_param;
2946 int length;
2947 int asconf_ack_len = asconf_ack->skb->len;
dbc16db1 2948 __be16 err_code;
1da177e4
LT		 2949
2950 if (no_err)
2951 err_code = SCTP_ERROR_NO_ERROR;
2952 else
2953 err_code = SCTP_ERROR_REQ_REFUSED;
2954
2955 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2956 * the first asconf_ack parameter.
d808ad9a 2957 */
1da177e4
LT		 2958 length = sizeof(sctp_addiphdr_t);
2959 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
2960 length);
2961 asconf_ack_len -= length;
2962
2963 while (asconf_ack_len > 0) {
2964 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
2965 switch(asconf_ack_param->param_hdr.type) {
2966 case SCTP_PARAM_SUCCESS_REPORT:
2967 return SCTP_ERROR_NO_ERROR;
2968 case SCTP_PARAM_ERR_CAUSE:
2969 length = sizeof(sctp_addip_param_t);
2970 err_param = (sctp_errhdr_t *)
2971 ((void *)asconf_ack_param + length);
2972 asconf_ack_len -= length;
2973 if (asconf_ack_len > 0)
2974 return err_param->cause;
2975 else
2976 return SCTP_ERROR_INV_PARAM;
2977 break;
2978 default:
2979 return SCTP_ERROR_INV_PARAM;
2980 }
2981 }
2982
2983 length = ntohs(asconf_ack_param->param_hdr.length);
2984 asconf_ack_param = (sctp_addip_param_t *)
2985 ((void *)asconf_ack_param + length);
2986 asconf_ack_len -= length;
2987 }
2988
2989 return err_code;
2990}
2991
2992/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2993int sctp_process_asconf_ack(struct sctp_association *asoc,
2994 struct sctp_chunk *asconf_ack)
2995{
2996 struct sctp_chunk *asconf = asoc->addip_last_asconf;
2997 union sctp_addr_param *addr_param;
2998 sctp_addip_param_t *asconf_param;
2999 int length = 0;
3000 int asconf_len = asconf->skb->len;
3001 int all_param_pass = 0;
3002 int no_err = 1;
3003 int retval = 0;
dbc16db1 3004 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3005
3006 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3007 * a pointer to address parameter.
d808ad9a 3008 */
1da177e4
LT		 3009 length = sizeof(sctp_addip_chunk_t);
3010 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3011 asconf_len -= length;
3012
3013 /* Skip the address parameter in the last asconf sent and store a
3014 * pointer to the first asconf paramter.
d808ad9a 3015 */
1da177e4
LT		 3016 length = ntohs(addr_param->v4.param_hdr.length);
3017 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3018 asconf_len -= length;
3019
3020 /* ADDIP 4.1
3021 * A8) If there is no response(s) to specific TLV parameter(s), and no
3022 * failures are indicated, then all request(s) are considered
3023 * successful.
3024 */
3025 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3026 all_param_pass = 1;
3027
3028 /* Process the TLVs contained in the last sent ASCONF chunk. */
3029 while (asconf_len > 0) {
3030 if (all_param_pass)
3031 err_code = SCTP_ERROR_NO_ERROR;
3032 else {
3033 err_code = sctp_get_asconf_response(asconf_ack,
3034 asconf_param,
3035 no_err);
3036 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3037 no_err = 0;
3038 }
3039
3040 switch (err_code) {
3041 case SCTP_ERROR_NO_ERROR:
3042 retval = sctp_asconf_param_success(asoc, asconf_param);
3043 break;
3044
3045 case SCTP_ERROR_RSRC_LOW:
3046 retval = 1;
3047 break;
3048
3049 case SCTP_ERROR_INV_PARAM:
3050 /* Disable sending this type of asconf parameter in
3051 * future.
d808ad9a 3052 */
1da177e4
LT		 3053 asoc->peer.addip_disabled_mask |=
3054 asconf_param->param_hdr.type;
3055 break;
3056
3057 case SCTP_ERROR_REQ_REFUSED:
3058 case SCTP_ERROR_DEL_LAST_IP:
3059 case SCTP_ERROR_DEL_SRC_IP:
3060 default:
3061 break;
3062 }
3063
3064 /* Skip the processed asconf parameter and move to the next
3065 * one.
d808ad9a 3066 */
1da177e4
LT		 3067 length = ntohs(asconf_param->param_hdr.length);
3068 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3069 length);
3070 asconf_len -= length;
3071 }
3072
3073 /* Free the cached last sent asconf chunk. */
3074 sctp_chunk_free(asconf);
3075 asoc->addip_last_asconf = NULL;
3076
3077 /* Send the next asconf chunk from the addip chunk queue. */
79af02c2
DM		 3078 if (!list_empty(&asoc->addip_chunk_list)) {
3079 struct list_head *entry = asoc->addip_chunk_list.next;
3080 asconf = list_entry(entry, struct sctp_chunk, list);
3081
3082 list_del_init(entry);
3083
1da177e4
LT		 3084 /* Hold the chunk until an ASCONF_ACK is received. */
3085 sctp_chunk_hold(asconf);
3086 if (sctp_primitive_ASCONF(asoc, asconf))
3087 sctp_chunk_free(asconf);
3088 else
3089 asoc->addip_last_asconf = asconf;
3090 }
3091
3092 return retval;
3093}
3094
d808ad9a 3095/* Make a FWD TSN chunk. */
1da177e4
LT		 3096struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3097 __u32 new_cum_tsn, size_t nstreams,
3098 struct sctp_fwdtsn_skip *skiplist)
3099{
3100 struct sctp_chunk *retval = NULL;
3101 struct sctp_fwdtsn_chunk *ftsn_chunk;
d808ad9a 3102 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3103 struct sctp_fwdtsn_skip skip;
3104 size_t hint;
3105 int i;
3106
3107 hint = (nstreams + 1) * sizeof(__u32);
3108
1da177e4
LT		 3109 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3110
3111 if (!retval)
3112 return NULL;
3113
3114 ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr;
3115
3116 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3117 retval->subh.fwdtsn_hdr =
3118 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3119
3120 for (i = 0; i < nstreams; i++) {
3121 skip.stream = skiplist[i].stream;
3122 skip.ssn = skiplist[i].ssn;
3123 sctp_addto_chunk(retval, sizeof(skip), &skip);
3124 }
3125
3126 return retval;
3127}
Linux 6.x block layer and io_uring tree(s)