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[mirror_ubuntu-hirsute-kernel.git] / net / sctp / sm_make_chunk.c
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60c778b2 1/* SCTP kernel implementation
1da177e4
LT		 2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
6 *
60c778b2 7 * This file is part of the SCTP kernel implementation
1da177e4
LT		 8 *
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
12 *
60c778b2 13 * This SCTP implementation is free software;
1da177e4
LT		 14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
60c778b2 19 * This SCTP implementation is distributed in the hope that it
1da177e4
LT		 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * C. Robin <chris@hundredacre.ac.uk>
41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Xingang Guo <xingang.guo@intel.com>
43 * Dajiang Zhang <dajiang.zhang@nokia.com>
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Ardelle Fan <ardelle.fan@intel.com>
47 * Kevin Gao <kevin.gao@intel.com>
48 *
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
51 */
52
145ce502
JP		 53#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
1da177e4
LT		 55#include <linux/types.h>
56#include <linux/kernel.h>
57#include <linux/ip.h>
58#include <linux/ipv6.h>
59#include <linux/net.h>
60#include <linux/inet.h>
ebc3bbcf 61#include <linux/scatterlist.h>
1da177e4 62#include <linux/crypto.h>
5a0e3ad6 63#include <linux/slab.h>
1da177e4
LT		 64#include <net/sock.h>
65
66#include <linux/skbuff.h>
67#include <linux/random.h> /* for get_random_bytes */
68#include <net/sctp/sctp.h>
69#include <net/sctp/sm.h>
70
dda91928
DB		 71static struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
72 __u8 type, __u8 flags, int paylen);
1da177e4
LT		 73static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
74 const struct sctp_association *asoc,
75 const struct sctp_chunk *init_chunk,
76 int *cookie_len,
77 const __u8 *raw_addrs, int addrs_len);
78static int sctp_process_param(struct sctp_association *asoc,
79 union sctp_params param,
80 const union sctp_addr *peer_addr,
dd0fc66f 81 gfp_t gfp);
8ee4be37
VY		 82static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
83 const void *data);
1da177e4
LT		 84
85/* What was the inbound interface for this chunk? */
86int sctp_chunk_iif(const struct sctp_chunk *chunk)
87{
88 struct sctp_af *af;
89 int iif = 0;
90
eddc9ec5 91 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
1da177e4
LT		 92 if (af)
93 iif = af->skb_iif(chunk->skb);
94
95 return iif;
96}
97
98/* RFC 2960 3.3.2 Initiation (INIT) (1)
99 *
100 * Note 2: The ECN capable field is reserved for future use of
101 * Explicit Congestion Notification.
102 */
103static const struct sctp_paramhdr ecap_param = {
104 SCTP_PARAM_ECN_CAPABLE,
09640e63 105 cpu_to_be16(sizeof(struct sctp_paramhdr)),
1da177e4
LT		 106};
107static const struct sctp_paramhdr prsctp_param = {
108 SCTP_PARAM_FWD_TSN_SUPPORT,
09640e63 109 cpu_to_be16(sizeof(struct sctp_paramhdr)),
1da177e4
LT		 110};
111
5fa782c2 112/* A helper to initialize an op error inside a
1da177e4
LT		 113 * provided chunk, as most cause codes will be embedded inside an
114 * abort chunk.
115 */
5bf2db03 116void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
00f1c2df 117 size_t paylen)
1da177e4
LT		 118{
119 sctp_errhdr_t err;
1da177e4
LT		 120 __u16 len;
121
d808ad9a 122 /* Cause code constants are now defined in network order. */
1da177e4
LT		 123 err.cause = cause_code;
124 len = sizeof(sctp_errhdr_t) + paylen;
1da177e4 125 err.length = htons(len);
4a1c0107 126 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
1da177e4
LT		 127}
128
5fa782c2
NH		 129/* A helper to initialize an op error inside a
130 * provided chunk, as most cause codes will be embedded inside an
131 * abort chunk. Differs from sctp_init_cause in that it won't oops
132 * if there isn't enough space in the op error chunk
133 */
db28aafa 134static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
5fa782c2
NH		 135 size_t paylen)
136{
137 sctp_errhdr_t err;
138 __u16 len;
139
140 /* Cause code constants are now defined in network order. */
141 err.cause = cause_code;
142 len = sizeof(sctp_errhdr_t) + paylen;
143 err.length = htons(len);
144
2e3219b5 145 if (skb_tailroom(chunk->skb) < len)
5fa782c2
NH		 146 return -ENOSPC;
147 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
148 sizeof(sctp_errhdr_t),
149 &err);
150 return 0;
151}
1da177e4
LT		 152/* 3.3.2 Initiation (INIT) (1)
153 *
154 * This chunk is used to initiate a SCTP association between two
155 * endpoints. The format of the INIT chunk is shown below:
156 *
157 * 0 1 2 3
158 * 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
159 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
160 * | Type = 1 | Chunk Flags | Chunk Length |
161 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
162 * | Initiate Tag |
163 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 * | Advertised Receiver Window Credit (a_rwnd) |
165 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
166 * | Number of Outbound Streams | Number of Inbound Streams |
167 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
168 * | Initial TSN |
169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * \ \
171 * / Optional/Variable-Length Parameters /
172 * \ \
173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 *
175 *
176 * The INIT chunk contains the following parameters. Unless otherwise
177 * noted, each parameter MUST only be included once in the INIT chunk.
178 *
179 * Fixed Parameters Status
180 * ----------------------------------------------
181 * Initiate Tag Mandatory
182 * Advertised Receiver Window Credit Mandatory
183 * Number of Outbound Streams Mandatory
184 * Number of Inbound Streams Mandatory
185 * Initial TSN Mandatory
186 *
187 * Variable Parameters Status Type Value
188 * -------------------------------------------------------------
189 * IPv4 Address (Note 1) Optional 5
190 * IPv6 Address (Note 1) Optional 6
191 * Cookie Preservative Optional 9
192 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
193 * Host Name Address (Note 3) Optional 11
194 * Supported Address Types (Note 4) Optional 12
195 */
196struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
197 const struct sctp_bind_addr *bp,
dd0fc66f 198 gfp_t gfp, int vparam_len)
1da177e4 199{
e1fc3b14 200 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 201 sctp_inithdr_t init;
202 union sctp_params addrs;
203 size_t chunksize;
204 struct sctp_chunk *retval = NULL;
205 int num_types, addrs_len = 0;
206 struct sctp_sock *sp;
207 sctp_supported_addrs_param_t sat;
3dbe8656 208 __be16 types[2];
0f3fffd8 209 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 210 sctp_supported_ext_param_t ext_param;
211 int num_ext = 0;
212 __u8 extensions[3];
730fc3d0
VY		 213 sctp_paramhdr_t *auth_chunks = NULL,
214 *auth_hmacs = NULL;
1da177e4
LT		 215
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
217 *
218 * Note 1: The INIT chunks can contain multiple addresses that
219 * can be IPv4 and/or IPv6 in any combination.
220 */
221 retval = NULL;
222
223 /* Convert the provided bind address list to raw format. */
224 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
225
226 init.init_tag = htonl(asoc->c.my_vtag);
227 init.a_rwnd = htonl(asoc->rwnd);
228 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
229 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
230 init.initial_tsn = htonl(asoc->c.initial_tsn);
231
232 /* How many address types are needed? */
233 sp = sctp_sk(asoc->base.sk);
234 num_types = sp->pf->supported_addrs(sp, types);
235
a8170c35
WY		 236 chunksize = sizeof(init) + addrs_len;
237 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
1da177e4 238 chunksize += sizeof(ecap_param);
8ee4be37 239
e1fc3b14 240 if (net->sctp.prsctp_enable)
036b579b
VY		 241 chunksize += sizeof(prsctp_param);
242
131a47e3
VY		 243 /* ADDIP: Section 4.2.7:
244 * An implementation supporting this extension [ADDIP] MUST list
245 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
246 * INIT-ACK parameters.
131a47e3 247 */
e1fc3b14 248 if (net->sctp.addip_enable) {
131a47e3
VY		 249 extensions[num_ext] = SCTP_CID_ASCONF;
250 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
251 num_ext += 2;
252 }
253
6fc791ee 254 if (sp->adaptation_ind)
255 chunksize += sizeof(aiparam);
256
1da177e4
LT		 257 chunksize += vparam_len;
258
730fc3d0 259 /* Account for AUTH related parameters */
e1fc3b14 260 if (net->sctp.auth_enable) {
730fc3d0
VY		 261 /* Add random parameter length*/
262 chunksize += sizeof(asoc->c.auth_random);
263
264 /* Add HMACS parameter length if any were defined */
265 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
266 if (auth_hmacs->length)
a8170c35 267 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 268 else
269 auth_hmacs = NULL;
270
271 /* Add CHUNKS parameter length */
272 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
273 if (auth_chunks->length)
a8170c35 274 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0 275 else
9baffaa6 276 auth_chunks = NULL;
730fc3d0
VY		 277
278 extensions[num_ext] = SCTP_CID_AUTH;
279 num_ext += 1;
280 }
281
131a47e3
VY		 282 /* If we have any extensions to report, account for that */
283 if (num_ext)
a8170c35
WY		 284 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
285 num_ext);
131a47e3 286
1da177e4
LT		 287 /* RFC 2960 3.3.2 Initiation (INIT) (1)
288 *
289 * Note 3: An INIT chunk MUST NOT contain more than one Host
290 * Name address parameter. Moreover, the sender of the INIT
291 * MUST NOT combine any other address types with the Host Name
292 * address in the INIT. The receiver of INIT MUST ignore any
293 * other address types if the Host Name address parameter is
294 * present in the received INIT chunk.
295 *
296 * PLEASE DO NOT FIXME [This version does not support Host Name.]
297 */
298
299 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
300 if (!retval)
301 goto nodata;
302
303 retval->subh.init_hdr =
304 sctp_addto_chunk(retval, sizeof(init), &init);
305 retval->param_hdr.v =
306 sctp_addto_chunk(retval, addrs_len, addrs.v);
307
308 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 *
310 * Note 4: This parameter, when present, specifies all the
311 * address types the sending endpoint can support. The absence
312 * of this parameter indicates that the sending endpoint can
313 * support any address type.
314 */
315 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
316 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
317 sctp_addto_chunk(retval, sizeof(sat), &sat);
318 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
319
320 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3 321
7aa1b54b 322 /* Add the supported extensions parameter. Be nice and add this
131a47e3
VY		 323 * fist before addiding the parameters for the extensions themselves
324 */
325 if (num_ext) {
326 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
327 ext_param.param_hdr.length =
328 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
329 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
330 &ext_param);
8ee4be37 331 sctp_addto_param(retval, num_ext, extensions);
131a47e3
VY		 332 }
333
e1fc3b14 334 if (net->sctp.prsctp_enable)
1da177e4 335 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
131a47e3 336
6fc791ee 337 if (sp->adaptation_ind) {
338 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
339 aiparam.param_hdr.length = htons(sizeof(aiparam));
340 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
341 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
342 }
131a47e3 343
730fc3d0 344 /* Add SCTP-AUTH chunks to the parameter list */
e1fc3b14 345 if (net->sctp.auth_enable) {
730fc3d0
VY		 346 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
347 asoc->c.auth_random);
348 if (auth_hmacs)
349 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
350 auth_hmacs);
351 if (auth_chunks)
352 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
353 auth_chunks);
354 }
1da177e4 355nodata:
a51482bd 356 kfree(addrs.v);
1da177e4
LT		 357 return retval;
358}
359
360struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
361 const struct sctp_chunk *chunk,
dd0fc66f 362 gfp_t gfp, int unkparam_len)
1da177e4
LT		 363{
364 sctp_inithdr_t initack;
365 struct sctp_chunk *retval;
366 union sctp_params addrs;
6fc791ee 367 struct sctp_sock *sp;
1da177e4
LT		 368 int addrs_len;
369 sctp_cookie_param_t *cookie;
370 int cookie_len;
371 size_t chunksize;
0f3fffd8 372 sctp_adaptation_ind_param_t aiparam;
131a47e3
VY		 373 sctp_supported_ext_param_t ext_param;
374 int num_ext = 0;
375 __u8 extensions[3];
730fc3d0
VY		 376 sctp_paramhdr_t *auth_chunks = NULL,
377 *auth_hmacs = NULL,
378 *auth_random = NULL;
1da177e4
LT		 379
380 retval = NULL;
381
382 /* Note: there may be no addresses to embed. */
383 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
384
385 initack.init_tag = htonl(asoc->c.my_vtag);
386 initack.a_rwnd = htonl(asoc->rwnd);
387 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
388 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
389 initack.initial_tsn = htonl(asoc->c.initial_tsn);
390
391 /* FIXME: We really ought to build the cookie right
392 * into the packet instead of allocating more fresh memory.
393 */
394 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
395 addrs.v, addrs_len);
396 if (!cookie)
397 goto nomem_cookie;
398
399 /* Calculate the total size of allocation, include the reserved
400 * space for reporting unknown parameters if it is specified.
401 */
6fc791ee 402 sp = sctp_sk(asoc->base.sk);
1da177e4
LT		 403 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
404
d808ad9a 405 /* Tell peer that we'll do ECN only if peer advertised such cap. */
1da177e4
LT		 406 if (asoc->peer.ecn_capable)
407 chunksize += sizeof(ecap_param);
408
5ffad5ac 409 if (asoc->peer.prsctp_capable)
036b579b
VY		 410 chunksize += sizeof(prsctp_param);
411
5ffad5ac 412 if (asoc->peer.asconf_capable) {
131a47e3
VY		 413 extensions[num_ext] = SCTP_CID_ASCONF;
414 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
415 num_ext += 2;
416 }
417
6fc791ee 418 if (sp->adaptation_ind)
419 chunksize += sizeof(aiparam);
1da177e4 420
730fc3d0
VY		 421 if (asoc->peer.auth_capable) {
422 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
423 chunksize += ntohs(auth_random->length);
424
425 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
426 if (auth_hmacs->length)
a8170c35 427 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
730fc3d0
VY		 428 else
429 auth_hmacs = NULL;
430
431 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
432 if (auth_chunks->length)
a8170c35 433 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
730fc3d0
VY		 434 else
435 auth_chunks = NULL;
436
437 extensions[num_ext] = SCTP_CID_AUTH;
438 num_ext += 1;
439 }
440
8ee4be37 441 if (num_ext)
a8170c35
WY		 442 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
443 num_ext);
8ee4be37 444
1da177e4
LT		 445 /* Now allocate and fill out the chunk. */
446 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
447 if (!retval)
448 goto nomem_chunk;
449
b99a4d53
DC		 450 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
451 *
452 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
453 * HEARTBEAT ACK, * etc.) to the same destination transport
454 * address from which it received the DATA or control chunk
455 * to which it is replying.
456 *
457 * [INIT ACK back to where the INIT came from.]
1da177e4
LT		 458 */
459 retval->transport = chunk->transport;
b99a4d53 460
1da177e4
LT		 461 retval->subh.init_hdr =
462 sctp_addto_chunk(retval, sizeof(initack), &initack);
463 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
464 sctp_addto_chunk(retval, cookie_len, cookie);
465 if (asoc->peer.ecn_capable)
466 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
131a47e3
VY		 467 if (num_ext) {
468 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
469 ext_param.param_hdr.length =
470 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
471 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
472 &ext_param);
8ee4be37 473 sctp_addto_param(retval, num_ext, extensions);
131a47e3 474 }
1da177e4
LT		 475 if (asoc->peer.prsctp_capable)
476 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
477
6fc791ee 478 if (sp->adaptation_ind) {
479 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
480 aiparam.param_hdr.length = htons(sizeof(aiparam));
481 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
482 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
483 }
1da177e4 484
730fc3d0
VY		 485 if (asoc->peer.auth_capable) {
486 sctp_addto_chunk(retval, ntohs(auth_random->length),
487 auth_random);
488 if (auth_hmacs)
489 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
490 auth_hmacs);
491 if (auth_chunks)
492 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
493 auth_chunks);
494 }
495
1da177e4
LT		 496 /* We need to remove the const qualifier at this point. */
497 retval->asoc = (struct sctp_association *) asoc;
498
1da177e4
LT		 499nomem_chunk:
500 kfree(cookie);
501nomem_cookie:
a51482bd 502 kfree(addrs.v);
1da177e4
LT		 503 return retval;
504}
505
506/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
507 *
508 * This chunk is used only during the initialization of an association.
509 * It is sent by the initiator of an association to its peer to complete
510 * the initialization process. This chunk MUST precede any DATA chunk
511 * sent within the association, but MAY be bundled with one or more DATA
512 * chunks in the same packet.
513 *
514 * 0 1 2 3
515 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * | Type = 10 |Chunk Flags | Length |
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
519 * / Cookie /
520 * \ \
521 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
522 *
523 * Chunk Flags: 8 bit
524 *
525 * Set to zero on transmit and ignored on receipt.
526 *
527 * Length: 16 bits (unsigned integer)
528 *
529 * Set to the size of the chunk in bytes, including the 4 bytes of
530 * the chunk header and the size of the Cookie.
531 *
532 * Cookie: variable size
533 *
534 * This field must contain the exact cookie received in the
535 * State Cookie parameter from the previous INIT ACK.
536 *
537 * An implementation SHOULD make the cookie as small as possible
538 * to insure interoperability.
539 */
540struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
541 const struct sctp_chunk *chunk)
542{
543 struct sctp_chunk *retval;
544 void *cookie;
545 int cookie_len;
546
547 cookie = asoc->peer.cookie;
548 cookie_len = asoc->peer.cookie_len;
549
550 /* Build a cookie echo chunk. */
551 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
552 if (!retval)
553 goto nodata;
554 retval->subh.cookie_hdr =
555 sctp_addto_chunk(retval, cookie_len, cookie);
556
557 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
558 *
559 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
560 * HEARTBEAT ACK, * etc.) to the same destination transport
561 * address from which it * received the DATA or control chunk
562 * to which it is replying.
563 *
564 * [COOKIE ECHO back to where the INIT ACK came from.]
565 */
566 if (chunk)
567 retval->transport = chunk->transport;
568
569nodata:
570 return retval;
571}
572
573/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
574 *
575 * This chunk is used only during the initialization of an
576 * association. It is used to acknowledge the receipt of a COOKIE
577 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
578 * within the association, but MAY be bundled with one or more DATA
579 * chunks or SACK chunk in the same SCTP packet.
580 *
581 * 0 1 2 3
582 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
584 * | Type = 11 |Chunk Flags | Length = 4 |
585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
586 *
587 * Chunk Flags: 8 bits
588 *
589 * Set to zero on transmit and ignored on receipt.
590 */
591struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
592 const struct sctp_chunk *chunk)
593{
594 struct sctp_chunk *retval;
595
596 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
597
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
599 *
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
604 *
605 * [COOKIE ACK back to where the COOKIE ECHO came from.]
606 */
607 if (retval && chunk)
608 retval->transport = chunk->transport;
609
610 return retval;
611}
612
613/*
614 * Appendix A: Explicit Congestion Notification:
615 * CWR:
616 *
617 * RFC 2481 details a specific bit for a sender to send in the header of
618 * its next outbound TCP segment to indicate to its peer that it has
619 * reduced its congestion window. This is termed the CWR bit. For
620 * SCTP the same indication is made by including the CWR chunk.
621 * This chunk contains one data element, i.e. the TSN number that
622 * was sent in the ECNE chunk. This element represents the lowest
623 * TSN number in the datagram that was originally marked with the
624 * CE bit.
625 *
626 * 0 1 2 3
627 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
629 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 * | Lowest TSN Number |
632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
633 *
634 * Note: The CWR is considered a Control chunk.
635 */
636struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
637 const __u32 lowest_tsn,
638 const struct sctp_chunk *chunk)
639{
640 struct sctp_chunk *retval;
641 sctp_cwrhdr_t cwr;
642
643 cwr.lowest_tsn = htonl(lowest_tsn);
644 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
645 sizeof(sctp_cwrhdr_t));
646
647 if (!retval)
648 goto nodata;
649
650 retval->subh.ecn_cwr_hdr =
651 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
652
653 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
654 *
655 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
656 * HEARTBEAT ACK, * etc.) to the same destination transport
657 * address from which it * received the DATA or control chunk
658 * to which it is replying.
659 *
660 * [Report a reduced congestion window back to where the ECNE
661 * came from.]
662 */
663 if (chunk)
664 retval->transport = chunk->transport;
665
666nodata:
667 return retval;
668}
669
670/* Make an ECNE chunk. This is a congestion experienced report. */
671struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
672 const __u32 lowest_tsn)
673{
674 struct sctp_chunk *retval;
675 sctp_ecnehdr_t ecne;
676
677 ecne.lowest_tsn = htonl(lowest_tsn);
678 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
679 sizeof(sctp_ecnehdr_t));
680 if (!retval)
681 goto nodata;
682 retval->subh.ecne_hdr =
683 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
684
685nodata:
686 return retval;
687}
688
689/* Make a DATA chunk for the given association from the provided
690 * parameters. However, do not populate the data payload.
691 */
692struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
693 const struct sctp_sndrcvinfo *sinfo,
694 int data_len, __u8 flags, __u16 ssn)
695{
696 struct sctp_chunk *retval;
697 struct sctp_datahdr dp;
698 int chunk_len;
699
700 /* We assign the TSN as LATE as possible, not here when
701 * creating the chunk.
702 */
703 dp.tsn = 0;
704 dp.stream = htons(sinfo->sinfo_stream);
705 dp.ppid = sinfo->sinfo_ppid;
706
707 /* Set the flags for an unordered send. */
eaa5c54d 708 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
1da177e4
LT		 709 flags |= SCTP_DATA_UNORDERED;
710 dp.ssn = 0;
711 } else
712 dp.ssn = htons(ssn);
713
714 chunk_len = sizeof(dp) + data_len;
715 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
716 if (!retval)
717 goto nodata;
718
719 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
720 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
721
722nodata:
723 return retval;
724}
725
726/* Create a selective ackowledgement (SACK) for the given
727 * association. This reports on which TSN's we've seen to date,
728 * including duplicates and gaps.
729 */
730struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
731{
732 struct sctp_chunk *retval;
733 struct sctp_sackhdr sack;
734 int len;
735 __u32 ctsn;
736 __u16 num_gabs, num_dup_tsns;
4244854d 737 struct sctp_association *aptr = (struct sctp_association *)asoc;
1da177e4 738 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
02015180 739 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
4244854d 740 struct sctp_transport *trans;
1da177e4 741
02015180 742 memset(gabs, 0, sizeof(gabs));
1da177e4
LT		 743 ctsn = sctp_tsnmap_get_ctsn(map);
744 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
745
746 /* How much room is needed in the chunk? */
02015180 747 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
1da177e4
LT		 748 num_dup_tsns = sctp_tsnmap_num_dups(map);
749
750 /* Initialize the SACK header. */
751 sack.cum_tsn_ack = htonl(ctsn);
752 sack.a_rwnd = htonl(asoc->a_rwnd);
753 sack.num_gap_ack_blocks = htons(num_gabs);
754 sack.num_dup_tsns = htons(num_dup_tsns);
755
756 len = sizeof(sack)
757 + sizeof(struct sctp_gap_ack_block) * num_gabs
758 + sizeof(__u32) * num_dup_tsns;
759
760 /* Create the chunk. */
761 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
762 if (!retval)
763 goto nodata;
764
765 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
766 *
767 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
768 * HEARTBEAT ACK, etc.) to the same destination transport
769 * address from which it received the DATA or control chunk to
770 * which it is replying. This rule should also be followed if
771 * the endpoint is bundling DATA chunks together with the
772 * reply chunk.
773 *
774 * However, when acknowledging multiple DATA chunks received
775 * in packets from different source addresses in a single
776 * SACK, the SACK chunk may be transmitted to one of the
777 * destination transport addresses from which the DATA or
778 * control chunks being acknowledged were received.
779 *
780 * [BUG: We do not implement the following paragraph.
781 * Perhaps we should remember the last transport we used for a
782 * SACK and avoid that (if possible) if we have seen any
783 * duplicates. --piggy]
784 *
785 * When a receiver of a duplicate DATA chunk sends a SACK to a
786 * multi- homed endpoint it MAY be beneficial to vary the
787 * destination address and not use the source address of the
788 * DATA chunk. The reason being that receiving a duplicate
789 * from a multi-homed endpoint might indicate that the return
790 * path (as specified in the source address of the DATA chunk)
791 * for the SACK is broken.
792 *
793 * [Send to the address from which we last received a DATA chunk.]
794 */
795 retval->transport = asoc->peer.last_data_from;
796
797 retval->subh.sack_hdr =
798 sctp_addto_chunk(retval, sizeof(sack), &sack);
799
800 /* Add the gap ack block information. */
801 if (num_gabs)
802 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
02015180 803 gabs);
1da177e4
LT		 804
805 /* Add the duplicate TSN information. */
196d6759
MB		 806 if (num_dup_tsns) {
807 aptr->stats.idupchunks += num_dup_tsns;
1da177e4
LT		 808 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
809 sctp_tsnmap_get_dups(map));
196d6759 810 }
4244854d
NH		 811 /* Once we have a sack generated, check to see what our sack
812 * generation is, if its 0, reset the transports to 0, and reset
813 * the association generation to 1
814 *
815 * The idea is that zero is never used as a valid generation for the
816 * association so no transport will match after a wrap event like this,
817 * Until the next sack
818 */
819 if (++aptr->peer.sack_generation == 0) {
820 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
821 transports)
822 trans->sack_generation = 0;
823 aptr->peer.sack_generation = 1;
824 }
1da177e4
LT		 825nodata:
826 return retval;
827}
828
829/* Make a SHUTDOWN chunk. */
830struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
831 const struct sctp_chunk *chunk)
832{
833 struct sctp_chunk *retval;
834 sctp_shutdownhdr_t shut;
835 __u32 ctsn;
836
837 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
838 shut.cum_tsn_ack = htonl(ctsn);
839
840 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
841 sizeof(sctp_shutdownhdr_t));
842 if (!retval)
843 goto nodata;
844
845 retval->subh.shutdown_hdr =
846 sctp_addto_chunk(retval, sizeof(shut), &shut);
847
848 if (chunk)
849 retval->transport = chunk->transport;
850nodata:
851 return retval;
852}
853
854struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
856{
857 struct sctp_chunk *retval;
858
859 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
860
861 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
862 *
863 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
864 * HEARTBEAT ACK, * etc.) to the same destination transport
865 * address from which it * received the DATA or control chunk
866 * to which it is replying.
867 *
868 * [ACK back to where the SHUTDOWN came from.]
869 */
870 if (retval && chunk)
871 retval->transport = chunk->transport;
872
873 return retval;
874}
875
876struct sctp_chunk *sctp_make_shutdown_complete(
877 const struct sctp_association *asoc,
878 const struct sctp_chunk *chunk)
879{
880 struct sctp_chunk *retval;
881 __u8 flags = 0;
882
047a2428
JF		 883 /* Set the T-bit if we have no association (vtag will be
884 * reflected)
885 */
1da177e4
LT		 886 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
887
888 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
889
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
891 *
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
896 *
897 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
898 * came from.]
899 */
900 if (retval && chunk)
901 retval->transport = chunk->transport;
902
d808ad9a 903 return retval;
1da177e4
LT		 904}
905
906/* Create an ABORT. Note that we set the T bit if we have no
047a2428 907 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 908 */
909struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
910 const struct sctp_chunk *chunk,
911 const size_t hint)
912{
913 struct sctp_chunk *retval;
914 __u8 flags = 0;
915
047a2428
JF		 916 /* Set the T-bit if we have no association and 'chunk' is not
917 * an INIT (vtag will be reflected).
918 */
919 if (!asoc) {
920 if (chunk && chunk->chunk_hdr &&
921 chunk->chunk_hdr->type == SCTP_CID_INIT)
922 flags = 0;
923 else
924 flags = SCTP_CHUNK_FLAG_T;
925 }
1da177e4
LT		 926
927 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
928
929 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
930 *
931 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
932 * HEARTBEAT ACK, * etc.) to the same destination transport
933 * address from which it * received the DATA or control chunk
934 * to which it is replying.
935 *
936 * [ABORT back to where the offender came from.]
937 */
938 if (retval && chunk)
939 retval->transport = chunk->transport;
940
941 return retval;
942}
943
944/* Helper to create ABORT with a NO_USER_DATA error. */
945struct sctp_chunk *sctp_make_abort_no_data(
946 const struct sctp_association *asoc,
947 const struct sctp_chunk *chunk, __u32 tsn)
948{
949 struct sctp_chunk *retval;
9f81bcd9 950 __be32 payload;
1da177e4
LT		 951
952 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
953 + sizeof(tsn));
954
955 if (!retval)
956 goto no_mem;
957
958 /* Put the tsn back into network byte order. */
959 payload = htonl(tsn);
00f1c2df
WY		 960 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
961 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 962
963 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
964 *
965 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
966 * HEARTBEAT ACK, * etc.) to the same destination transport
967 * address from which it * received the DATA or control chunk
968 * to which it is replying.
969 *
970 * [ABORT back to where the offender came from.]
971 */
972 if (chunk)
973 retval->transport = chunk->transport;
974
975no_mem:
976 return retval;
977}
978
979/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
980struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 981 const struct msghdr *msg,
982 size_t paylen)
1da177e4
LT		 983{
984 struct sctp_chunk *retval;
c164a9ba
SS		 985 void *payload = NULL;
986 int err;
1da177e4 987
c164a9ba 988 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 989 if (!retval)
990 goto err_chunk;
991
992 if (paylen) {
993 /* Put the msg_iov together into payload. */
c164a9ba 994 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 995 if (!payload)
996 goto err_payload;
c164a9ba
SS		 997
998 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
999 if (err < 0)
1000 goto err_copy;
1da177e4
LT		 1001 }
1002
00f1c2df
WY		 1003 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1004 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 1005
1006 if (paylen)
1007 kfree(payload);
1008
1009 return retval;
1010
1011err_copy:
1012 kfree(payload);
1013err_payload:
1014 sctp_chunk_free(retval);
1015 retval = NULL;
1016err_chunk:
1017 return retval;
1018}
1019
5c94bf86
AB		 1020/* Append bytes to the end of a parameter. Will panic if chunk is not big
1021 * enough.
1022 */
1023static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1024 const void *data)
1025{
1026 void *target;
1027 int chunklen = ntohs(chunk->chunk_hdr->length);
1028
1029 target = skb_put(chunk->skb, len);
1030
6383cfb3
VY		 1031 if (data)
1032 memcpy(target, data, len);
1033 else
1034 memset(target, 0, len);
5c94bf86
AB		 1035
1036 /* Adjust the chunk length field. */
1037 chunk->chunk_hdr->length = htons(chunklen + len);
1038 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1039
1040 return target;
1041}
1042
d808ad9a 1043/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 1044struct sctp_chunk *sctp_make_abort_violation(
1045 const struct sctp_association *asoc,
1046 const struct sctp_chunk *chunk,
1047 const __u8 *payload,
1048 const size_t paylen)
1049{
1050 struct sctp_chunk *retval;
1051 struct sctp_paramhdr phdr;
1052
1053 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1054 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1055 if (!retval)
1056 goto end;
1057
00f1c2df
WY		 1058 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1059 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1060
1061 phdr.type = htons(chunk->chunk_hdr->type);
1062 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1063 sctp_addto_chunk(retval, paylen, payload);
1064 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1065
1066end:
1067 return retval;
1068}
1069
ba016670
WY		 1070struct sctp_chunk *sctp_make_violation_paramlen(
1071 const struct sctp_association *asoc,
1072 const struct sctp_chunk *chunk,
1073 struct sctp_paramhdr *param)
1074{
1075 struct sctp_chunk *retval;
1076 static const char error[] = "The following parameter had invalid length:";
1077 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1078 sizeof(sctp_paramhdr_t);
1079
1080 retval = sctp_make_abort(asoc, chunk, payload_len);
1081 if (!retval)
1082 goto nodata;
1083
1084 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1085 sizeof(error) + sizeof(sctp_paramhdr_t));
1086 sctp_addto_chunk(retval, sizeof(error), error);
1087 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1088
1089nodata:
1090 return retval;
1091}
1092
de4594a5
NH		 1093struct sctp_chunk *sctp_make_violation_max_retrans(
1094 const struct sctp_association *asoc,
1095 const struct sctp_chunk *chunk)
1096{
1097 struct sctp_chunk *retval;
1098 static const char error[] = "Association exceeded its max_retans count";
1099 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1100
1101 retval = sctp_make_abort(asoc, chunk, payload_len);
1102 if (!retval)
1103 goto nodata;
1104
1105 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1106 sctp_addto_chunk(retval, sizeof(error), error);
1107
1108nodata:
1109 return retval;
1110}
1111
1da177e4
LT		 1112/* Make a HEARTBEAT chunk. */
1113struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
92c73af5 1114 const struct sctp_transport *transport)
1da177e4 1115{
92c73af5
WY		 1116 struct sctp_chunk *retval;
1117 sctp_sender_hb_info_t hbinfo;
1118
1119 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
1da177e4
LT		 1120
1121 if (!retval)
1122 goto nodata;
1123
92c73af5
WY		 1124 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1125 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1126 hbinfo.daddr = transport->ipaddr;
1127 hbinfo.sent_at = jiffies;
1128 hbinfo.hb_nonce = transport->hb_nonce;
1129
1da177e4
LT		 1130 /* Cast away the 'const', as this is just telling the chunk
1131 * what transport it belongs to.
1132 */
1133 retval->transport = (struct sctp_transport *) transport;
92c73af5
WY		 1134 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1135 &hbinfo);
1da177e4
LT		 1136
1137nodata:
1138 return retval;
1139}
1140
1141struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1142 const struct sctp_chunk *chunk,
1143 const void *payload, const size_t paylen)
1144{
1145 struct sctp_chunk *retval;
1146
1147 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1148 if (!retval)
1149 goto nodata;
1150
1151 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1152
1153 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1154 *
1155 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1156 * HEARTBEAT ACK, * etc.) to the same destination transport
1157 * address from which it * received the DATA or control chunk
1158 * to which it is replying.
1159 *
1160 * [HBACK back to where the HEARTBEAT came from.]
1161 */
1162 if (chunk)
1163 retval->transport = chunk->transport;
1164
1165nodata:
1166 return retval;
1167}
1168
1169/* Create an Operation Error chunk with the specified space reserved.
1170 * This routine can be used for containing multiple causes in the chunk.
1171 */
1172static struct sctp_chunk *sctp_make_op_error_space(
1173 const struct sctp_association *asoc,
1174 const struct sctp_chunk *chunk,
1175 size_t size)
1176{
1177 struct sctp_chunk *retval;
1178
1179 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1180 sizeof(sctp_errhdr_t) + size);
1181 if (!retval)
1182 goto nodata;
1183
1184 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1185 *
1186 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1187 * HEARTBEAT ACK, etc.) to the same destination transport
1188 * address from which it received the DATA or control chunk
1189 * to which it is replying.
1190 *
1191 */
1192 if (chunk)
1193 retval->transport = chunk->transport;
1194
1195nodata:
1196 return retval;
1197}
1198
5fa782c2
NH		 1199/* Create an Operation Error chunk of a fixed size,
1200 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1201 * This is a helper function to allocate an error chunk for
1202 * for those invalid parameter codes in which we may not want
d82603c6 1203 * to report all the errors, if the incoming chunk is large
5fa782c2
NH		 1204 */
1205static inline struct sctp_chunk *sctp_make_op_error_fixed(
1206 const struct sctp_association *asoc,
1207 const struct sctp_chunk *chunk)
1208{
1209 size_t size = asoc ? asoc->pathmtu : 0;
1210
1211 if (!size)
1212 size = SCTP_DEFAULT_MAXSEGMENT;
1213
1214 return sctp_make_op_error_space(asoc, chunk, size);
1215}
1216
1da177e4
LT		 1217/* Create an Operation Error chunk. */
1218struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1219 const struct sctp_chunk *chunk,
63706c5c 1220 __be16 cause_code, const void *payload,
6383cfb3 1221 size_t paylen, size_t reserve_tail)
1da177e4
LT		 1222{
1223 struct sctp_chunk *retval;
1224
6383cfb3 1225 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1da177e4
LT		 1226 if (!retval)
1227 goto nodata;
1228
6383cfb3 1229 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
00f1c2df 1230 sctp_addto_chunk(retval, paylen, payload);
6383cfb3
VY		 1231 if (reserve_tail)
1232 sctp_addto_param(retval, reserve_tail, NULL);
1da177e4
LT		 1233
1234nodata:
1235 return retval;
1236}
1237
4cd57c80
VY		 1238struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1239{
1240 struct sctp_chunk *retval;
1241 struct sctp_hmac *hmac_desc;
1242 struct sctp_authhdr auth_hdr;
1243 __u8 *hmac;
1244
1245 /* Get the first hmac that the peer told us to use */
1246 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1247 if (unlikely(!hmac_desc))
1248 return NULL;
1249
1250 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1251 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1252 if (!retval)
1253 return NULL;
1254
1255 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1256 auth_hdr.shkey_id = htons(asoc->active_key_id);
1257
1258 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1259 &auth_hdr);
1260
1261 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1262 memset(hmac, 0, hmac_desc->hmac_len);
1263
1264 /* Adjust the chunk header to include the empty MAC */
1265 retval->chunk_hdr->length =
1266 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1267 retval->chunk_end = skb_tail_pointer(retval->skb);
1268
1269 return retval;
1270}
1271
1272
1da177e4
LT		 1273/********************************************************************
1274 * 2nd Level Abstractions
1275 ********************************************************************/
1276
1277/* Turn an skb into a chunk.
1278 * FIXME: Eventually move the structure directly inside the skb->cb[].
1279 */
1280struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1281 const struct sctp_association *asoc,
1282 struct sock *sk)
1283{
1284 struct sctp_chunk *retval;
1285
c3762229 1286 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1287
1288 if (!retval)
1289 goto nodata;
1da177e4
LT		 1290
1291 if (!sk) {
1292 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1293 }
1294
79af02c2 1295 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1296 retval->skb = skb;
1297 retval->asoc = (struct sctp_association *)asoc;
1da177e4
LT		 1298 retval->has_tsn = 0;
1299 retval->has_ssn = 0;
1300 retval->rtt_in_progress = 0;
1301 retval->sent_at = 0;
1302 retval->singleton = 1;
1303 retval->end_of_packet = 0;
1304 retval->ecn_ce_done = 0;
1305 retval->pdiscard = 0;
1306
1307 /* sctpimpguide-05.txt Section 2.8.2
1308 * M1) Each time a new DATA chunk is transmitted
1309 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1310 * 'TSN.Missing.Report' count will be used to determine missing chunks
1311 * and when to fast retransmit.
1312 */
1313 retval->tsn_missing_report = 0;
1314 retval->tsn_gap_acked = 0;
c226ef9b 1315 retval->fast_retransmit = SCTP_CAN_FRTX;
1da177e4
LT		 1316
1317 /* If this is a fragmented message, track all fragments
1318 * of the message (for SEND_FAILED).
1319 */
1320 retval->msg = NULL;
1321
1322 /* Polish the bead hole. */
1323 INIT_LIST_HEAD(&retval->transmitted_list);
1324 INIT_LIST_HEAD(&retval->frag_list);
1325 SCTP_DBG_OBJCNT_INC(chunk);
1326 atomic_set(&retval->refcnt, 1);
1327
1328nodata:
1329 return retval;
1330}
1331
1332/* Set chunk->source and dest based on the IP header in chunk->skb. */
1333void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1334 union sctp_addr *dest)
1335{
f235fca3 1336 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1337 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1338}
1339
1340/* Extract the source address from a chunk. */
1341const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1342{
1343 /* If we have a known transport, use that. */
1344 if (chunk->transport) {
6a1e5f33 1345 return &chunk->transport->ipaddr;
1da177e4
LT		 1346 } else {
1347 /* Otherwise, extract it from the IP header. */
6a1e5f33 1348 return &chunk->source;
1da177e4
LT		 1349 }
1350}
1351
1352/* Create a new chunk, setting the type and flags headers from the
1353 * arguments, reserving enough space for a 'paylen' byte payload.
1354 */
dda91928
DB		 1355static struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1356 __u8 type, __u8 flags, int paylen)
1da177e4
LT		 1357{
1358 struct sctp_chunk *retval;
1359 sctp_chunkhdr_t *chunk_hdr;
1360 struct sk_buff *skb;
1361 struct sock *sk;
1362
1363 /* No need to allocate LL here, as this is only a chunk. */
1364 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1365 GFP_ATOMIC);
1366 if (!skb)
1367 goto nodata;
1368
1369 /* Make room for the chunk header. */
1370 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1371 chunk_hdr->type = type;
1372 chunk_hdr->flags = flags;
1373 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1374
1375 sk = asoc ? asoc->base.sk : NULL;
1376 retval = sctp_chunkify(skb, asoc, sk);
1377 if (!retval) {
1378 kfree_skb(skb);
1379 goto nodata;
1380 }
1381
1382 retval->chunk_hdr = chunk_hdr;
1383 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1384
4cd57c80
VY		 1385 /* Determine if the chunk needs to be authenticated */
1386 if (sctp_auth_send_cid(type, asoc))
1387 retval->auth = 1;
1388
1da177e4
LT		 1389 /* Set the skb to the belonging sock for accounting. */
1390 skb->sk = sk;
1391
1392 return retval;
1393nodata:
1394 return NULL;
1395}
1396
1397
1398/* Release the memory occupied by a chunk. */
1399static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1400{
a08de64d
VY		 1401 BUG_ON(!list_empty(&chunk->list));
1402 list_del_init(&chunk->transmitted_list);
1403
1da177e4
LT		 1404 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1405 dev_kfree_skb(chunk->skb);
1406
1407 SCTP_DBG_OBJCNT_DEC(chunk);
1408 kmem_cache_free(sctp_chunk_cachep, chunk);
1409}
1410
1411/* Possibly, free the chunk. */
1412void sctp_chunk_free(struct sctp_chunk *chunk)
1413{
1da177e4
LT		 1414 /* Release our reference on the message tracker. */
1415 if (chunk->msg)
1416 sctp_datamsg_put(chunk->msg);
1417
1418 sctp_chunk_put(chunk);
1419}
1420
1421/* Grab a reference to the chunk. */
1422void sctp_chunk_hold(struct sctp_chunk *ch)
1423{
1424 atomic_inc(&ch->refcnt);
1425}
1426
1427/* Release a reference to the chunk. */
1428void sctp_chunk_put(struct sctp_chunk *ch)
1429{
1430 if (atomic_dec_and_test(&ch->refcnt))
1431 sctp_chunk_destroy(ch);
1432}
1433
1434/* Append bytes to the end of a chunk. Will panic if chunk is not big
1435 * enough.
1436 */
1437void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1438{
1439 void *target;
1440 void *padding;
1441 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1442 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1443
1444 padding = skb_put(chunk->skb, padlen);
1445 target = skb_put(chunk->skb, len);
1446
1447 memset(padding, 0, padlen);
1448 memcpy(target, data, len);
1449
1450 /* Adjust the chunk length field. */
1451 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1452 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1453
1454 return target;
1455}
1456
5fa782c2
NH		 1457/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1458 * space in the chunk
1459 */
1460void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1461 int len, const void *data)
1462{
2e3219b5 1463 if (skb_tailroom(chunk->skb) >= len)
5fa782c2
NH		 1464 return sctp_addto_chunk(chunk, len, data);
1465 else
1466 return NULL;
1467}
1468
1da177e4
LT		 1469/* Append bytes from user space to the end of a chunk. Will panic if
1470 * chunk is not big enough.
1471 * Returns a kernel err value.
1472 */
1473int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1474 struct iovec *data)
1475{
1476 __u8 *target;
1477 int err = 0;
1478
1479 /* Make room in chunk for data. */
1480 target = skb_put(chunk->skb, len);
1481
1482 /* Copy data (whole iovec) into chunk */
1483 if ((err = memcpy_fromiovecend(target, data, off, len)))
1484 goto out;
1485
1486 /* Adjust the chunk length field. */
1487 chunk->chunk_hdr->length =
1488 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1489 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1490
1491out:
1492 return err;
1493}
1494
1495/* Helper function to assign a TSN if needed. This assumes that both
1496 * the data_hdr and association have already been assigned.
1497 */
1498void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1499{
ab3e5e7b
VY		 1500 struct sctp_datamsg *msg;
1501 struct sctp_chunk *lchunk;
1502 struct sctp_stream *stream;
1da177e4
LT		 1503 __u16 ssn;
1504 __u16 sid;
1505
1506 if (chunk->has_ssn)
1507 return;
1508
ab3e5e7b
VY		 1509 /* All fragments will be on the same stream */
1510 sid = ntohs(chunk->subh.data_hdr->stream);
1511 stream = &chunk->asoc->ssnmap->out;
1da177e4 1512
ab3e5e7b
VY		 1513 /* Now assign the sequence number to the entire message.
1514 * All fragments must have the same stream sequence number.
1515 */
1516 msg = chunk->msg;
1517 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1518 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1519 ssn = 0;
1520 } else {
1521 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1522 ssn = sctp_ssn_next(stream, sid);
1523 else
1524 ssn = sctp_ssn_peek(stream, sid);
1525 }
1526
1527 lchunk->subh.data_hdr->ssn = htons(ssn);
1528 lchunk->has_ssn = 1;
1529 }
1da177e4
LT		 1530}
1531
1532/* Helper function to assign a TSN if needed. This assumes that both
1533 * the data_hdr and association have already been assigned.
1534 */
1535void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1536{
1537 if (!chunk->has_tsn) {
1538 /* This is the last possible instant to
1539 * assign a TSN.
1540 */
1541 chunk->subh.data_hdr->tsn =
1542 htonl(sctp_association_get_next_tsn(chunk->asoc));
1543 chunk->has_tsn = 1;
1544 }
1545}
1546
1547/* Create a CLOSED association to use with an incoming packet. */
1548struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1549 struct sctp_chunk *chunk,
dd0fc66f 1550 gfp_t gfp)
1da177e4
LT		 1551{
1552 struct sctp_association *asoc;
1553 struct sk_buff *skb;
1554 sctp_scope_t scope;
1555 struct sctp_af *af;
1556
1557 /* Create the bare association. */
1558 scope = sctp_scope(sctp_source(chunk));
1559 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1560 if (!asoc)
1561 goto nodata;
1562 asoc->temp = 1;
1563 skb = chunk->skb;
1564 /* Create an entry for the source address of the packet. */
eddc9ec5 1565 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1566 if (unlikely(!af))
1567 goto fail;
d55c41b1 1568 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1569nodata:
1570 return asoc;
1571
1572fail:
1573 sctp_association_free(asoc);
1574 return NULL;
1575}
1576
1577/* Build a cookie representing asoc.
1578 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1579 */
1580static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1581 const struct sctp_association *asoc,
1582 const struct sctp_chunk *init_chunk,
1583 int *cookie_len,
1584 const __u8 *raw_addrs, int addrs_len)
1585{
1586 sctp_cookie_param_t *retval;
1587 struct sctp_signed_cookie *cookie;
1588 struct scatterlist sg;
1589 int headersize, bodysize;
1da177e4 1590
9834a2bb
VY		 1591 /* Header size is static data prior to the actual cookie, including
1592 * any padding.
1593 */
d808ad9a
YH		 1594 headersize = sizeof(sctp_paramhdr_t) +
1595 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1596 sizeof(struct sctp_cookie));
1da177e4
LT		 1597 bodysize = sizeof(struct sctp_cookie)
1598 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1599
1600 /* Pad out the cookie to a multiple to make the signature
1601 * functions simpler to write.
1602 */
1603 if (bodysize % SCTP_COOKIE_MULTIPLE)
1604 bodysize += SCTP_COOKIE_MULTIPLE
1605 - (bodysize % SCTP_COOKIE_MULTIPLE);
1606 *cookie_len = headersize + bodysize;
1607
1da177e4
LT		 1608 /* Clear this memory since we are sending this data structure
1609 * out on the network.
1610 */
af997d8c
ACM		 1611 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1612 if (!retval)
1613 goto nodata;
1614
1da177e4
LT		 1615 cookie = (struct sctp_signed_cookie *) retval->body;
1616
1617 /* Set up the parameter header. */
1618 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1619 retval->p.length = htons(*cookie_len);
1620
1621 /* Copy the cookie part of the association itself. */
1622 cookie->c = asoc->c;
1623 /* Save the raw address list length in the cookie. */
1624 cookie->c.raw_addr_list_len = addrs_len;
1625
1626 /* Remember PR-SCTP capability. */
1627 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1628
0f3fffd8
ISJ		 1629 /* Save adaptation indication in the cookie. */
1630 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1631
1632 /* Set an expiration time for the cookie. */
52db882f
DB		 1633 cookie->c.expiration = ktime_add(asoc->cookie_life,
1634 ktime_get());
1da177e4
LT		 1635
1636 /* Copy the peer's init packet. */
1637 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1638 ntohs(init_chunk->chunk_hdr->length));
1639
1640 /* Copy the raw local address list of the association. */
1641 memcpy((__u8 *)&cookie->c.peer_init[0] +
1642 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1643
d808ad9a 1644 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1645 struct hash_desc desc;
1646
1da177e4 1647 /* Sign the message. */
68e3f5dd 1648 sg_init_one(&sg, &cookie->c, bodysize);
d808ad9a
YH		 1649 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1650 desc.flags = 0;
1da177e4 1651
570617e7
DB		 1652 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1653 sizeof(ep->secret_key)) ||
1b489e11
HX		 1654 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1655 goto free_cookie;
1da177e4
LT		 1656 }
1657
1da177e4 1658 return retval;
1b489e11
HX		 1659
1660free_cookie:
1661 kfree(retval);
1662nodata:
1663 *cookie_len = 0;
1664 return NULL;
1da177e4
LT		 1665}
1666
1667/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1668struct sctp_association *sctp_unpack_cookie(
1669 const struct sctp_endpoint *ep,
1670 const struct sctp_association *asoc,
dd0fc66f 1671 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1672 int *error, struct sctp_chunk **errp)
1673{
1674 struct sctp_association *retval = NULL;
1675 struct sctp_signed_cookie *cookie;
1676 struct sctp_cookie *bear_cookie;
1677 int headersize, bodysize, fixed_size;
313e7b4d 1678 __u8 *digest = ep->digest;
1da177e4 1679 struct scatterlist sg;
570617e7 1680 unsigned int len;
1da177e4
LT		 1681 sctp_scope_t scope;
1682 struct sk_buff *skb = chunk->skb;
52db882f 1683 ktime_t kt;
1b489e11 1684 struct hash_desc desc;
1da177e4 1685
9834a2bb
VY		 1686 /* Header size is static data prior to the actual cookie, including
1687 * any padding.
1688 */
1689 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1690 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1691 sizeof(struct sctp_cookie));
1da177e4
LT		 1692 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1693 fixed_size = headersize + sizeof(struct sctp_cookie);
1694
1695 /* Verify that the chunk looks like it even has a cookie.
1696 * There must be enough room for our cookie and our peer's
1697 * INIT chunk.
1698 */
1699 len = ntohs(chunk->chunk_hdr->length);
1700 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1701 goto malformed;
1702
1703 /* Verify that the cookie has been padded out. */
1704 if (bodysize % SCTP_COOKIE_MULTIPLE)
1705 goto malformed;
1706
1707 /* Process the cookie. */
1708 cookie = chunk->subh.cookie_hdr;
1709 bear_cookie = &cookie->c;
1710
1711 if (!sctp_sk(ep->base.sk)->hmac)
1712 goto no_hmac;
1713
1714 /* Check the signature. */
68e3f5dd 1715 sg_init_one(&sg, bear_cookie, bodysize);
1b489e11
HX		 1716 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1717 desc.flags = 0;
1da177e4 1718
8ca84481 1719 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
570617e7
DB		 1720 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1721 sizeof(ep->secret_key)) ||
1b489e11
HX		 1722 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1723 *error = -SCTP_IERROR_NOMEM;
1724 goto fail;
1725 }
1da177e4
LT		 1726
1727 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
570617e7
DB		 1728 *error = -SCTP_IERROR_BAD_SIG;
1729 goto fail;
1da177e4
LT		 1730 }
1731
1732no_hmac:
1733 /* IG Section 2.35.2:
1734 * 3) Compare the port numbers and the verification tag contained
1735 * within the COOKIE ECHO chunk to the actual port numbers and the
1736 * verification tag within the SCTP common header of the received
1737 * packet. If these values do not match the packet MUST be silently
1738 * discarded,
1739 */
1740 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1741 *error = -SCTP_IERROR_BAD_TAG;
1742 goto fail;
1743 }
1744
9b1dfad0 1745 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1746 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1747 *error = -SCTP_IERROR_BAD_PORTS;
1748 goto fail;
1749 }
1750
1751 /* Check to see if the cookie is stale. If there is already
1752 * an association, there is no need to check cookie's expiration
1753 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1754 * If skb has been timestamped, then use the stamp, otherwise
1755 * use current time. This introduces a small possibility that
1756 * that a cookie may be considered expired, but his would only slow
1757 * down the new association establishment instead of every packet.
1da177e4 1758 */
f236218b 1759 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
52db882f 1760 kt = skb_get_ktime(skb);
f236218b 1761 else
52db882f 1762 kt = ktime_get();
f236218b 1763
52db882f 1764 if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) {
1da177e4
LT		 1765 /*
1766 * Section 3.3.10.3 Stale Cookie Error (3)
1767 *
1768 * Cause of error
1769 * ---------------
1770 * Stale Cookie Error: Indicates the receipt of a valid State
1771 * Cookie that has expired.
1772 */
1773 len = ntohs(chunk->chunk_hdr->length);
1774 *errp = sctp_make_op_error_space(asoc, chunk, len);
1775 if (*errp) {
52db882f 1776 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
34bcca28 1777 __be32 n = htonl(usecs);
1da177e4 1778
1da177e4 1779 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1780 sizeof(n));
1781 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1782 *error = -SCTP_IERROR_STALE_COOKIE;
1783 } else
1784 *error = -SCTP_IERROR_NOMEM;
1785
1786 goto fail;
1787 }
1788
1789 /* Make a new base association. */
1790 scope = sctp_scope(sctp_source(chunk));
1791 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1792 if (!retval) {
1793 *error = -SCTP_IERROR_NOMEM;
1794 goto fail;
1795 }
1796
1797 /* Set up our peer's port number. */
1798 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1799
1800 /* Populate the association from the cookie. */
1801 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1802
1803 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1804 GFP_ATOMIC) < 0) {
1805 *error = -SCTP_IERROR_NOMEM;
1806 goto fail;
1807 }
1808
1809 /* Also, add the destination address. */
1810 if (list_empty(&retval->base.bind_addr.address_list)) {
f57d96b2
VY		 1811 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1812 SCTP_ADDR_SRC, GFP_ATOMIC);
1da177e4
LT		 1813 }
1814
1815 retval->next_tsn = retval->c.initial_tsn;
1816 retval->ctsn_ack_point = retval->next_tsn - 1;
1817 retval->addip_serial = retval->c.initial_tsn;
1818 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1819 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1820 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1821
1822 /* The INIT stuff will be done by the side effects. */
1823 return retval;
1824
1825fail:
1826 if (retval)
1827 sctp_association_free(retval);
1828
1829 return NULL;
1830
1831malformed:
1832 /* Yikes! The packet is either corrupt or deliberately
1833 * malformed.
1834 */
1835 *error = -SCTP_IERROR_MALFORMED;
1836 goto fail;
1837}
1838
1839/********************************************************************
1840 * 3rd Level Abstractions
1841 ********************************************************************/
1842
1843struct __sctp_missing {
9f81bcd9
AV		 1844 __be32 num_missing;
1845 __be16 type;
bc10502d 1846} __packed;
1da177e4
LT		 1847
1848/*
1849 * Report a missing mandatory parameter.
1850 */
1851static int sctp_process_missing_param(const struct sctp_association *asoc,
1852 sctp_param_t paramtype,
1853 struct sctp_chunk *chunk,
1854 struct sctp_chunk **errp)
1855{
1856 struct __sctp_missing report;
1857 __u16 len;
1858
1859 len = WORD_ROUND(sizeof(report));
1860
1861 /* Make an ERROR chunk, preparing enough room for
1862 * returning multiple unknown parameters.
1863 */
1864 if (!*errp)
1865 *errp = sctp_make_op_error_space(asoc, chunk, len);
1866
1867 if (*errp) {
1868 report.num_missing = htonl(1);
1869 report.type = paramtype;
ebdfcad4 1870 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1871 sizeof(report));
1872 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1873 }
1874
1875 /* Stop processing this chunk. */
1876 return 0;
1877}
1878
1879/* Report an Invalid Mandatory Parameter. */
1880static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1881 struct sctp_chunk *chunk,
1882 struct sctp_chunk **errp)
1883{
1884 /* Invalid Mandatory Parameter Error has no payload. */
1885
1886 if (!*errp)
1887 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1888
1889 if (*errp)
00f1c2df 1890 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1891
1892 /* Stop processing this chunk. */
1893 return 0;
1894}
1895
1896static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1897 struct sctp_paramhdr *param,
1898 const struct sctp_chunk *chunk,
1899 struct sctp_chunk **errp)
1900{
7ab90804
VY		 1901 /* This is a fatal error. Any accumulated non-fatal errors are
1902 * not reported.
1903 */
1904 if (*errp)
1905 sctp_chunk_free(*errp);
1906
1da177e4 1907 /* Create an error chunk and fill it in with our payload. */
ba016670 1908 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1da177e4
LT		 1909
1910 return 0;
1911}
1912
1913
1914/* Do not attempt to handle the HOST_NAME parm. However, do
1915 * send back an indicator to the peer.
1916 */
1917static int sctp_process_hn_param(const struct sctp_association *asoc,
1918 union sctp_params param,
1919 struct sctp_chunk *chunk,
1920 struct sctp_chunk **errp)
1921{
1922 __u16 len = ntohs(param.p->length);
1923
7ab90804
VY		 1924 /* Processing of the HOST_NAME parameter will generate an
1925 * ABORT. If we've accumulated any non-fatal errors, they
1926 * would be unrecognized parameters and we should not include
1927 * them in the ABORT.
1928 */
1929 if (*errp)
1930 sctp_chunk_free(*errp);
1931
1932 *errp = sctp_make_op_error_space(asoc, chunk, len);
1da177e4 1933
00f1c2df
WY		 1934 if (*errp) {
1935 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1936 sctp_addto_chunk(*errp, len, param.v);
1937 }
1da177e4
LT		 1938
1939 /* Stop processing this chunk. */
1940 return 0;
1941}
1942
f53b5b09 1943static int sctp_verify_ext_param(struct net *net, union sctp_params param)
d6701191
VY		 1944{
1945 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1946 int have_auth = 0;
1947 int have_asconf = 0;
1948 int i;
1949
1950 for (i = 0; i < num_ext; i++) {
1951 switch (param.ext->chunks[i]) {
1952 case SCTP_CID_AUTH:
1953 have_auth = 1;
1954 break;
1955 case SCTP_CID_ASCONF:
1956 case SCTP_CID_ASCONF_ACK:
1957 have_asconf = 1;
1958 break;
1959 }
1960 }
1961
1962 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1963 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1964 * only if ADD-IP is turned on and we are not backward-compatible
1965 * mode.
1966 */
e1fc3b14 1967 if (net->sctp.addip_noauth)
d6701191
VY		 1968 return 1;
1969
e1fc3b14 1970 if (net->sctp.addip_enable && !have_auth && have_asconf)
d6701191
VY		 1971 return 0;
1972
1973 return 1;
1974}
1975
131a47e3
VY		 1976static void sctp_process_ext_param(struct sctp_association *asoc,
1977 union sctp_params param)
1978{
e1fc3b14 1979 struct net *net = sock_net(asoc->base.sk);
131a47e3
VY		 1980 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1981 int i;
1982
1983 for (i = 0; i < num_ext; i++) {
1984 switch (param.ext->chunks[i]) {
1985 case SCTP_CID_FWD_TSN:
e1fc3b14 1986 if (net->sctp.prsctp_enable &&
131a47e3
VY		 1987 !asoc->peer.prsctp_capable)
1988 asoc->peer.prsctp_capable = 1;
1989 break;
730fc3d0
VY		 1990 case SCTP_CID_AUTH:
1991 /* if the peer reports AUTH, assume that he
1992 * supports AUTH.
1993 */
e1fc3b14 1994 if (net->sctp.auth_enable)
0ef46e28 1995 asoc->peer.auth_capable = 1;
730fc3d0 1996 break;
131a47e3
VY		 1997 case SCTP_CID_ASCONF:
1998 case SCTP_CID_ASCONF_ACK:
e1fc3b14 1999 if (net->sctp.addip_enable)
0ef46e28 2000 asoc->peer.asconf_capable = 1;
6b2f9cb6 2001 break;
131a47e3
VY		 2002 default:
2003 break;
2004 }
2005 }
2006}
2007
1da177e4
LT		 2008/* RFC 3.2.1 & the Implementers Guide 2.2.
2009 *
2010 * The Parameter Types are encoded such that the
2011 * highest-order two bits specify the action that must be
2012 * taken if the processing endpoint does not recognize the
2013 * Parameter Type.
2014 *
7ab90804
VY		 2015 * 00 - Stop processing this parameter; do not process any further
2016 * parameters within this chunk
1da177e4 2017 *
7ab90804
VY		 2018 * 01 - Stop processing this parameter, do not process any further
2019 * parameters within this chunk, and report the unrecognized
2020 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2021 *
2022 * 10 - Skip this parameter and continue processing.
2023 *
2024 * 11 - Skip this parameter and continue processing but
2025 * report the unrecognized parameter in an
7ab90804 2026 * 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2027 *
2028 * Return value:
7ab90804
VY		 2029 * SCTP_IERROR_NO_ERROR - continue with the chunk
2030 * SCTP_IERROR_ERROR - stop and report an error.
2031 * SCTP_IERROR_NOMEME - out of memory.
1da177e4 2032 */
7ab90804
VY		 2033static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2034 union sctp_params param,
2035 struct sctp_chunk *chunk,
2036 struct sctp_chunk **errp)
1da177e4 2037{
7ab90804 2038 int retval = SCTP_IERROR_NO_ERROR;
1da177e4
LT		 2039
2040 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2041 case SCTP_PARAM_ACTION_DISCARD:
7ab90804 2042 retval = SCTP_IERROR_ERROR;
1da177e4
LT		 2043 break;
2044 case SCTP_PARAM_ACTION_SKIP:
2045 break;
7ab90804
VY		 2046 case SCTP_PARAM_ACTION_DISCARD_ERR:
2047 retval = SCTP_IERROR_ERROR;
2048 /* Fall through */
1da177e4
LT		 2049 case SCTP_PARAM_ACTION_SKIP_ERR:
2050 /* Make an ERROR chunk, preparing enough room for
2051 * returning multiple unknown parameters.
2052 */
2053 if (NULL == *errp)
5fa782c2 2054 *errp = sctp_make_op_error_fixed(asoc, chunk);
1da177e4
LT		 2055
2056 if (*errp) {
2205a6ea
JB		 2057 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2058 WORD_ROUND(ntohs(param.p->length))))
2059 sctp_addto_chunk_fixed(*errp,
2060 WORD_ROUND(ntohs(param.p->length)),
2061 param.v);
1da177e4
LT		 2062 } else {
2063 /* If there is no memory for generating the ERROR
2064 * report as specified, an ABORT will be triggered
2065 * to the peer and the association won't be
2066 * established.
2067 */
7ab90804 2068 retval = SCTP_IERROR_NOMEM;
1da177e4 2069 }
1da177e4
LT		 2070 break;
2071 default:
2072 break;
2073 }
2074
2075 return retval;
2076}
2077
7ab90804 2078/* Verify variable length parameters
1da177e4 2079 * Return values:
7ab90804
VY		 2080 * SCTP_IERROR_ABORT - trigger an ABORT
2081 * SCTP_IERROR_NOMEM - out of memory (abort)
2082 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2083 * SCTP_IERROR_NO_ERROR - continue with the chunk
1da177e4 2084 */
f53b5b09
EB		 2085static sctp_ierror_t sctp_verify_param(struct net *net,
2086 const struct sctp_association *asoc,
7ab90804
VY		 2087 union sctp_params param,
2088 sctp_cid_t cid,
2089 struct sctp_chunk *chunk,
2090 struct sctp_chunk **err_chunk)
1da177e4 2091{
72da7b38 2092 struct sctp_hmac_algo_param *hmacs;
7ab90804 2093 int retval = SCTP_IERROR_NO_ERROR;
72da7b38
WY		 2094 __u16 n_elt, id = 0;
2095 int i;
1da177e4
LT		 2096
2097 /* FIXME - This routine is not looking at each parameter per the
2098 * chunk type, i.e., unrecognized parameters should be further
2099 * identified based on the chunk id.
2100 */
2101
2102 switch (param.p->type) {
2103 case SCTP_PARAM_IPV4_ADDRESS:
2104 case SCTP_PARAM_IPV6_ADDRESS:
2105 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2106 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2107 case SCTP_PARAM_STATE_COOKIE:
2108 case SCTP_PARAM_HEARTBEAT_INFO:
2109 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2110 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 2111 case SCTP_PARAM_ADAPTATION_LAYER_IND:
d6701191
VY		 2112 break;
2113
131a47e3 2114 case SCTP_PARAM_SUPPORTED_EXT:
f53b5b09 2115 if (!sctp_verify_ext_param(net, param))
d6701191 2116 return SCTP_IERROR_ABORT;
1da177e4
LT		 2117 break;
2118
d6de3097 2119 case SCTP_PARAM_SET_PRIMARY:
e1fc3b14 2120 if (net->sctp.addip_enable)
d6de3097
VY		 2121 break;
2122 goto fallthrough;
2123
1da177e4
LT		 2124 case SCTP_PARAM_HOST_NAME_ADDRESS:
2125 /* Tell the peer, we won't support this param. */
7ab90804
VY		 2126 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2127 retval = SCTP_IERROR_ABORT;
2128 break;
131a47e3 2129
1da177e4 2130 case SCTP_PARAM_FWD_TSN_SUPPORT:
e1fc3b14 2131 if (net->sctp.prsctp_enable)
1da177e4 2132 break;
730fc3d0
VY		 2133 goto fallthrough;
2134
2135 case SCTP_PARAM_RANDOM:
e1fc3b14 2136 if (!net->sctp.auth_enable)
730fc3d0
VY		 2137 goto fallthrough;
2138
2139 /* SCTP-AUTH: Secion 6.1
2140 * If the random number is not 32 byte long the association
2141 * MUST be aborted. The ABORT chunk SHOULD contain the error
2142 * cause 'Protocol Violation'.
2143 */
2144 if (SCTP_AUTH_RANDOM_LENGTH !=
7ab90804
VY		 2145 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2146 sctp_process_inv_paramlength(asoc, param.p,
730fc3d0 2147 chunk, err_chunk);
7ab90804
VY		 2148 retval = SCTP_IERROR_ABORT;
2149 }
730fc3d0
VY		 2150 break;
2151
2152 case SCTP_PARAM_CHUNKS:
e1fc3b14 2153 if (!net->sctp.auth_enable)
730fc3d0
VY		 2154 goto fallthrough;
2155
2156 /* SCTP-AUTH: Section 3.2
2157 * The CHUNKS parameter MUST be included once in the INIT or
2158 * INIT-ACK chunk if the sender wants to receive authenticated
2159 * chunks. Its maximum length is 260 bytes.
2160 */
7ab90804
VY		 2161 if (260 < ntohs(param.p->length)) {
2162 sctp_process_inv_paramlength(asoc, param.p,
2163 chunk, err_chunk);
2164 retval = SCTP_IERROR_ABORT;
2165 }
730fc3d0
VY		 2166 break;
2167
2168 case SCTP_PARAM_HMAC_ALGO:
e1fc3b14 2169 if (!net->sctp.auth_enable)
72da7b38
WY		 2170 goto fallthrough;
2171
2172 hmacs = (struct sctp_hmac_algo_param *)param.p;
2173 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2174
2175 /* SCTP-AUTH: Section 6.1
2176 * The HMAC algorithm based on SHA-1 MUST be supported and
2177 * included in the HMAC-ALGO parameter.
2178 */
2179 for (i = 0; i < n_elt; i++) {
2180 id = ntohs(hmacs->hmac_ids[i]);
2181
2182 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2183 break;
2184 }
2185
2186 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2187 sctp_process_inv_paramlength(asoc, param.p, chunk,
2188 err_chunk);
2189 retval = SCTP_IERROR_ABORT;
2190 }
2191 break;
730fc3d0 2192fallthrough:
1da177e4
LT		 2193 default:
2194 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2195 ntohs(param.p->type), cid);
7ab90804 2196 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
1da177e4
LT		 2197 break;
2198 }
2199 return retval;
2200}
2201
2202/* Verify the INIT packet before we process it. */
f53b5b09 2203int sctp_verify_init(struct net *net, const struct sctp_association *asoc,
1da177e4
LT		 2204 sctp_cid_t cid,
2205 sctp_init_chunk_t *peer_init,
2206 struct sctp_chunk *chunk,
2207 struct sctp_chunk **errp)
2208{
2209 union sctp_params param;
2210 int has_cookie = 0;
7ab90804 2211 int result;
1da177e4
LT		 2212
2213 /* Verify stream values are non-zero. */
2214 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
d023f629
VY		 2215 (0 == peer_init->init_hdr.num_inbound_streams) ||
2216 (0 == peer_init->init_hdr.init_tag) ||
2217 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
1da177e4 2218
7ab90804 2219 return sctp_process_inv_mandatory(asoc, chunk, errp);
1da177e4
LT		 2220 }
2221
2222 /* Check for missing mandatory parameters. */
2223 sctp_walk_params(param, peer_init, init_hdr.params) {
2224
2225 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2226 has_cookie = 1;
2227
2228 } /* for (loop through all parameters) */
2229
2230 /* There is a possibility that a parameter length was bad and
2231 * in that case we would have stoped walking the parameters.
2232 * The current param.p would point at the bad one.
2233 * Current consensus on the mailing list is to generate a PROTOCOL
2234 * VIOLATION error. We build the ERROR chunk here and let the normal
2235 * error handling code build and send the packet.
2236 */
7ab90804
VY		 2237 if (param.v != (void*)chunk->chunk_end)
2238 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
1da177e4
LT		 2239
2240 /* The only missing mandatory param possible today is
2241 * the state cookie for an INIT-ACK chunk.
2242 */
7ab90804
VY		 2243 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2244 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2245 chunk, errp);
1da177e4 2246
7ab90804 2247 /* Verify all the variable length parameters */
1da177e4
LT		 2248 sctp_walk_params(param, peer_init, init_hdr.params) {
2249
f53b5b09 2250 result = sctp_verify_param(net, asoc, param, cid, chunk, errp);
7ab90804
VY		 2251 switch (result) {
2252 case SCTP_IERROR_ABORT:
2253 case SCTP_IERROR_NOMEM:
1da177e4 2254 return 0;
7ab90804 2255 case SCTP_IERROR_ERROR:
1da177e4 2256 return 1;
7ab90804
VY		 2257 case SCTP_IERROR_NO_ERROR:
2258 default:
2259 break;
1da177e4
LT		 2260 }
2261
2262 } /* for (loop through all parameters) */
2263
2264 return 1;
2265}
2266
2267/* Unpack the parameters in an INIT packet into an association.
2268 * Returns 0 on failure, else success.
2269 * FIXME: This is an association method.
2270 */
de6becdc 2271int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
1da177e4 2272 const union sctp_addr *peer_addr,
dd0fc66f 2273 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4 2274{
e1fc3b14 2275 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 2276 union sctp_params param;
2277 struct sctp_transport *transport;
2278 struct list_head *pos, *temp;
de6becdc
WY		 2279 struct sctp_af *af;
2280 union sctp_addr addr;
1da177e4 2281 char *cookie;
de6becdc 2282 int src_match = 0;
1da177e4
LT		 2283
2284 /* We must include the address that the INIT packet came from.
2285 * This is the only address that matters for an INIT packet.
2286 * When processing a COOKIE ECHO, we retrieve the from address
2287 * of the INIT from the cookie.
2288 */
2289
2290 /* This implementation defaults to making the first transport
2291 * added as the primary transport. The source address seems to
2292 * be a a better choice than any of the embedded addresses.
2293 */
de6becdc
WY		 2294 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2295 goto nomem;
2296
2297 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2298 src_match = 1;
1da177e4
LT		 2299
2300 /* Process the initialization parameters. */
1da177e4 2301 sctp_walk_params(param, peer_init, init_hdr.params) {
de6becdc
WY		 2302 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2303 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2304 af = sctp_get_af_specific(param_type2af(param.p->type));
2305 af->from_addr_param(&addr, param.addr,
2306 chunk->sctp_hdr->source, 0);
2307 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2308 src_match = 1;
2309 }
1da177e4
LT		 2310
2311 if (!sctp_process_param(asoc, param, peer_addr, gfp))
d808ad9a 2312 goto clean_up;
1da177e4
LT		 2313 }
2314
de6becdc
WY		 2315 /* source address of chunk may not match any valid address */
2316 if (!src_match)
2317 goto clean_up;
2318
730fc3d0
VY		 2319 /* AUTH: After processing the parameters, make sure that we
2320 * have all the required info to potentially do authentications.
2321 */
2322 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2323 !asoc->peer.peer_hmacs))
2324 asoc->peer.auth_capable = 0;
2325
d6701191
VY		 2326 /* In a non-backward compatible mode, if the peer claims
2327 * support for ADD-IP but not AUTH, the ADD-IP spec states
2328 * that we MUST ABORT the association. Section 6. The section
2329 * also give us an option to silently ignore the packet, which
2330 * is what we'll do here.
6b2f9cb6 2331 */
e1fc3b14 2332 if (!net->sctp.addip_noauth &&
73d9c4fd 2333 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
6b2f9cb6
VY		 2334 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2335 SCTP_PARAM_DEL_IP |
2336 SCTP_PARAM_SET_PRIMARY);
88799fe5 2337 asoc->peer.asconf_capable = 0;
d6701191 2338 goto clean_up;
6b2f9cb6
VY		 2339 }
2340
3f7a87d2
FF		 2341 /* Walk list of transports, removing transports in the UNKNOWN state. */
2342 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2343 transport = list_entry(pos, struct sctp_transport, transports);
2344 if (transport->state == SCTP_UNKNOWN) {
2345 sctp_assoc_rm_peer(asoc, transport);
2346 }
2347 }
2348
1da177e4
LT		 2349 /* The fixed INIT headers are always in network byte
2350 * order.
2351 */
2352 asoc->peer.i.init_tag =
2353 ntohl(peer_init->init_hdr.init_tag);
2354 asoc->peer.i.a_rwnd =
2355 ntohl(peer_init->init_hdr.a_rwnd);
2356 asoc->peer.i.num_outbound_streams =
2357 ntohs(peer_init->init_hdr.num_outbound_streams);
2358 asoc->peer.i.num_inbound_streams =
2359 ntohs(peer_init->init_hdr.num_inbound_streams);
2360 asoc->peer.i.initial_tsn =
2361 ntohl(peer_init->init_hdr.initial_tsn);
2362
2363 /* Apply the upper bounds for output streams based on peer's
2364 * number of inbound streams.
2365 */
2366 if (asoc->c.sinit_num_ostreams >
2367 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2368 asoc->c.sinit_num_ostreams =
2369 ntohs(peer_init->init_hdr.num_inbound_streams);
2370 }
2371
2372 if (asoc->c.sinit_max_instreams >
2373 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2374 asoc->c.sinit_max_instreams =
2375 ntohs(peer_init->init_hdr.num_outbound_streams);
2376 }
2377
2378 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2379 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2380
2381 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2382 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2383
2384 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2385 cookie = asoc->peer.cookie;
2386 if (cookie) {
af997d8c 2387 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
1da177e4
LT		 2388 if (!asoc->peer.cookie)
2389 goto clean_up;
1da177e4
LT		 2390 }
2391
2392 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2393 * high (for example, implementations MAY use the size of the receiver
2394 * advertised window).
2395 */
9dbc15f0
RD		 2396 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2397 transports) {
1da177e4
LT		 2398 transport->ssthresh = asoc->peer.i.a_rwnd;
2399 }
2400
2401 /* Set up the TSN tracking pieces. */
8e1ee18c
VY		 2402 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2403 asoc->peer.i.initial_tsn, gfp))
2404 goto clean_up;
1da177e4
LT		 2405
2406 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2407 *
2408 * The stream sequence number in all the streams shall start
2409 * from 0 when the association is established. Also, when the
2410 * stream sequence number reaches the value 65535 the next
2411 * stream sequence number shall be set to 0.
2412 */
2413
3f7a87d2 2414 /* Allocate storage for the negotiated streams if it is not a temporary
d808ad9a 2415 * association.
1da177e4
LT		 2416 */
2417 if (!asoc->temp) {
1da177e4
LT		 2418 int error;
2419
2420 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2421 asoc->c.sinit_num_ostreams, gfp);
2422 if (!asoc->ssnmap)
2423 goto clean_up;
2424
07d93967
VY		 2425 error = sctp_assoc_set_id(asoc, gfp);
2426 if (error)
1da177e4 2427 goto clean_up;
1da177e4
LT		 2428 }
2429
2430 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2431 *
2432 * When an endpoint has an ASCONF signaled change to be sent to the
2433 * remote endpoint it should do the following:
2434 * ...
2435 * A2) A serial number should be assigned to the Chunk. The serial
2436 * number should be a monotonically increasing number. All serial
2437 * numbers are defined to be initialized at the start of the
2438 * association to the same value as the Initial TSN.
2439 */
2440 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2441 return 1;
2442
2443clean_up:
2444 /* Release the transport structures. */
2445 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2446 transport = list_entry(pos, struct sctp_transport, transports);
add52379
VY		 2447 if (transport->state != SCTP_ACTIVE)
2448 sctp_assoc_rm_peer(asoc, transport);
1da177e4 2449 }
3f7a87d2 2450
1da177e4
LT		 2451nomem:
2452 return 0;
2453}
2454
2455
2456/* Update asoc with the option described in param.
2457 *
2458 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2459 *
2460 * asoc is the association to update.
2461 * param is the variable length parameter to use for update.
2462 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2463 * If the current packet is an INIT we want to minimize the amount of
2464 * work we do. In particular, we should not build transport
2465 * structures for the addresses.
2466 */
2467static int sctp_process_param(struct sctp_association *asoc,
2468 union sctp_params param,
2469 const union sctp_addr *peer_addr,
dd0fc66f 2470 gfp_t gfp)
1da177e4 2471{
e7ff4a70 2472 struct net *net = sock_net(asoc->base.sk);
1da177e4
LT		 2473 union sctp_addr addr;
2474 int i;
2475 __u16 sat;
2476 int retval = 1;
2477 sctp_scope_t scope;
2478 time_t stale;
2479 struct sctp_af *af;
d6de3097
VY		 2480 union sctp_addr_param *addr_param;
2481 struct sctp_transport *t;
1da177e4
LT		 2482
2483 /* We maintain all INIT parameters in network byte order all the
2484 * time. This allows us to not worry about whether the parameters
2485 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2486 */
2487 switch (param.p->type) {
2488 case SCTP_PARAM_IPV6_ADDRESS:
2489 if (PF_INET6 != asoc->base.sk->sk_family)
2490 break;
7dab83de
VY		 2491 goto do_addr_param;
2492
1da177e4 2493 case SCTP_PARAM_IPV4_ADDRESS:
7dab83de
VY		 2494 /* v4 addresses are not allowed on v6-only socket */
2495 if (ipv6_only_sock(asoc->base.sk))
2496 break;
2497do_addr_param:
1da177e4 2498 af = sctp_get_af_specific(param_type2af(param.p->type));
dd86d136 2499 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
1da177e4 2500 scope = sctp_scope(peer_addr);
e7ff4a70 2501 if (sctp_in_scope(net, &addr, scope))
dd86d136 2502 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2503 return 0;
2504 break;
2505
2506 case SCTP_PARAM_COOKIE_PRESERVATIVE:
e1fc3b14 2507 if (!net->sctp.cookie_preserve_enable)
1da177e4
LT		 2508 break;
2509
2510 stale = ntohl(param.life->lifespan_increment);
2511
2512 /* Suggested Cookie Life span increment's unit is msec,
2513 * (1/1000sec).
2514 */
52db882f 2515 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
1da177e4
LT		 2516 break;
2517
2518 case SCTP_PARAM_HOST_NAME_ADDRESS:
2519 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2520 break;
2521
2522 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2523 /* Turn off the default values first so we'll know which
2524 * ones are really set by the peer.
2525 */
2526 asoc->peer.ipv4_address = 0;
2527 asoc->peer.ipv6_address = 0;
2528
140ee960
GJ		 2529 /* Assume that peer supports the address family
2530 * by which it sends a packet.
2531 */
2532 if (peer_addr->sa.sa_family == AF_INET6)
2533 asoc->peer.ipv6_address = 1;
2534 else if (peer_addr->sa.sa_family == AF_INET)
2535 asoc->peer.ipv4_address = 1;
2536
1da177e4
LT		 2537 /* Cycle through address types; avoid divide by 0. */
2538 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2539 if (sat)
2540 sat /= sizeof(__u16);
2541
2542 for (i = 0; i < sat; ++i) {
2543 switch (param.sat->types[i]) {
2544 case SCTP_PARAM_IPV4_ADDRESS:
2545 asoc->peer.ipv4_address = 1;
2546 break;
2547
2548 case SCTP_PARAM_IPV6_ADDRESS:
6e40a915
WY		 2549 if (PF_INET6 == asoc->base.sk->sk_family)
2550 asoc->peer.ipv6_address = 1;
1da177e4
LT		 2551 break;
2552
2553 case SCTP_PARAM_HOST_NAME_ADDRESS:
2554 asoc->peer.hostname_address = 1;
2555 break;
2556
2557 default: /* Just ignore anything else. */
2558 break;
3ff50b79 2559 }
1da177e4
LT		 2560 }
2561 break;
2562
2563 case SCTP_PARAM_STATE_COOKIE:
2564 asoc->peer.cookie_len =
2565 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2566 asoc->peer.cookie = param.cookie->body;
2567 break;
2568
2569 case SCTP_PARAM_HEARTBEAT_INFO:
2570 /* Would be odd to receive, but it causes no problems. */
2571 break;
2572
2573 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2574 /* Rejected during verify stage. */
2575 break;
2576
2577 case SCTP_PARAM_ECN_CAPABLE:
2578 asoc->peer.ecn_capable = 1;
2579 break;
2580
0f3fffd8 2581 case SCTP_PARAM_ADAPTATION_LAYER_IND:
e69c4e0f 2582 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
1da177e4
LT		 2583 break;
2584
d6de3097 2585 case SCTP_PARAM_SET_PRIMARY:
e1fc3b14 2586 if (!net->sctp.addip_enable)
0ef46e28
VY		 2587 goto fall_through;
2588
d6de3097
VY		 2589 addr_param = param.v + sizeof(sctp_addip_param_t);
2590
2591 af = sctp_get_af_specific(param_type2af(param.p->type));
2592 af->from_addr_param(&addr, addr_param,
2593 htons(asoc->peer.port), 0);
2594
2595 /* if the address is invalid, we can't process it.
2596 * XXX: see spec for what to do.
2597 */
2598 if (!af->addr_valid(&addr, NULL, NULL))
2599 break;
2600
2601 t = sctp_assoc_lookup_paddr(asoc, &addr);
2602 if (!t)
2603 break;
2604
2605 sctp_assoc_set_primary(asoc, t);
2606 break;
2607
131a47e3
VY		 2608 case SCTP_PARAM_SUPPORTED_EXT:
2609 sctp_process_ext_param(asoc, param);
2610 break;
2611
1da177e4 2612 case SCTP_PARAM_FWD_TSN_SUPPORT:
e1fc3b14 2613 if (net->sctp.prsctp_enable) {
1da177e4
LT		 2614 asoc->peer.prsctp_capable = 1;
2615 break;
2616 }
d808ad9a 2617 /* Fall Through */
730fc3d0
VY		 2618 goto fall_through;
2619
2620 case SCTP_PARAM_RANDOM:
e1fc3b14 2621 if (!net->sctp.auth_enable)
730fc3d0
VY		 2622 goto fall_through;
2623
2624 /* Save peer's random parameter */
2625 asoc->peer.peer_random = kmemdup(param.p,
2626 ntohs(param.p->length), gfp);
2627 if (!asoc->peer.peer_random) {
2628 retval = 0;
2629 break;
2630 }
2631 break;
2632
2633 case SCTP_PARAM_HMAC_ALGO:
e1fc3b14 2634 if (!net->sctp.auth_enable)
730fc3d0
VY		 2635 goto fall_through;
2636
2637 /* Save peer's HMAC list */
2638 asoc->peer.peer_hmacs = kmemdup(param.p,
2639 ntohs(param.p->length), gfp);
2640 if (!asoc->peer.peer_hmacs) {
2641 retval = 0;
2642 break;
2643 }
2644
2645 /* Set the default HMAC the peer requested*/
2646 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2647 break;
2648
2649 case SCTP_PARAM_CHUNKS:
e1fc3b14 2650 if (!net->sctp.auth_enable)
730fc3d0
VY		 2651 goto fall_through;
2652
2653 asoc->peer.peer_chunks = kmemdup(param.p,
2654 ntohs(param.p->length), gfp);
2655 if (!asoc->peer.peer_chunks)
2656 retval = 0;
2657 break;
2658fall_through:
1da177e4
LT		 2659 default:
2660 /* Any unrecognized parameters should have been caught
2661 * and handled by sctp_verify_param() which should be
2662 * called prior to this routine. Simply log the error
2663 * here.
2664 */
2665 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2666 ntohs(param.p->type), asoc);
2667 break;
3ff50b79 2668 }
1da177e4
LT		 2669
2670 return retval;
2671}
2672
2673/* Select a new verification tag. */
2674__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2675{
2676 /* I believe that this random number generator complies with RFC1750.
2677 * A tag of 0 is reserved for special cases (e.g. INIT).
2678 */
2679 __u32 x;
2680
2681 do {
2682 get_random_bytes(&x, sizeof(__u32));
2683 } while (x == 0);
2684
2685 return x;
2686}
2687
2688/* Select an initial TSN to send during startup. */
2689__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2690{
2691 __u32 retval;
2692
2693 get_random_bytes(&retval, sizeof(__u32));
2694 return retval;
2695}
2696
2697/*
2698 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2699 * 0 1 2 3
2700 * 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
2701 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2702 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2703 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2704 * | Serial Number |
2705 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2706 * | Address Parameter |
2707 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2708 * | ASCONF Parameter #1 |
2709 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2710 * \ \
2711 * / .... /
2712 * \ \
2713 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2714 * | ASCONF Parameter #N |
2715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2716 *
d808ad9a 2717 * Address Parameter and other parameter will not be wrapped in this function
1da177e4
LT		 2718 */
2719static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2720 union sctp_addr *addr,
2721 int vparam_len)
2722{
2723 sctp_addiphdr_t asconf;
2724 struct sctp_chunk *retval;
2725 int length = sizeof(asconf) + vparam_len;
2726 union sctp_addr_param addrparam;
2727 int addrlen;
2728 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2729
2730 addrlen = af->to_addr_param(addr, &addrparam);
2731 if (!addrlen)
2732 return NULL;
2733 length += addrlen;
2734
2735 /* Create the chunk. */
2736 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2737 if (!retval)
2738 return NULL;
2739
2740 asconf.serial = htonl(asoc->addip_serial++);
2741
2742 retval->subh.addip_hdr =
2743 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2744 retval->param_hdr.v =
2745 sctp_addto_chunk(retval, addrlen, &addrparam);
2746
2747 return retval;
2748}
2749
2750/* ADDIP
2751 * 3.2.1 Add IP Address
2752 * 0 1 2 3
2753 * 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
2754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2755 * | Type = 0xC001 | Length = Variable |
2756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2757 * | ASCONF-Request Correlation ID |
2758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2759 * | Address Parameter |
2760 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2761 *
2762 * 3.2.2 Delete IP Address
2763 * 0 1 2 3
2764 * 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
2765 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2766 * | Type = 0xC002 | Length = Variable |
2767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2768 * | ASCONF-Request Correlation ID |
2769 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2770 * | Address Parameter |
2771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2772 *
2773 */
2774struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2775 union sctp_addr *laddr,
2776 struct sockaddr *addrs,
2777 int addrcnt,
dbc16db1 2778 __be16 flags)
1da177e4
LT		 2779{
2780 sctp_addip_param_t param;
2781 struct sctp_chunk *retval;
2782 union sctp_addr_param addr_param;
2783 union sctp_addr *addr;
2784 void *addr_buf;
2785 struct sctp_af *af;
2786 int paramlen = sizeof(param);
2787 int addr_param_len = 0;
2788 int totallen = 0;
2789 int i;
8a07eb0a 2790 int del_pickup = 0;
1da177e4
LT		 2791
2792 /* Get total length of all the address parameters. */
2793 addr_buf = addrs;
2794 for (i = 0; i < addrcnt; i++) {
ea110733 2795 addr = addr_buf;
1da177e4
LT		 2796 af = sctp_get_af_specific(addr->v4.sin_family);
2797 addr_param_len = af->to_addr_param(addr, &addr_param);
2798
2799 totallen += paramlen;
2800 totallen += addr_param_len;
2801
2802 addr_buf += af->sockaddr_len;
8a07eb0a
MH		 2803 if (asoc->asconf_addr_del_pending && !del_pickup) {
2804 /* reuse the parameter length from the same scope one */
2805 totallen += paramlen;
2806 totallen += addr_param_len;
2807 del_pickup = 1;
2808 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
2809 }
1da177e4
LT		 2810 }
2811
2812 /* Create an asconf chunk with the required length. */
2813 retval = sctp_make_asconf(asoc, laddr, totallen);
2814 if (!retval)
2815 return NULL;
2816
2817 /* Add the address parameters to the asconf chunk. */
2818 addr_buf = addrs;
2819 for (i = 0; i < addrcnt; i++) {
ea110733 2820 addr = addr_buf;
1da177e4
LT		 2821 af = sctp_get_af_specific(addr->v4.sin_family);
2822 addr_param_len = af->to_addr_param(addr, &addr_param);
2823 param.param_hdr.type = flags;
2824 param.param_hdr.length = htons(paramlen + addr_param_len);
2825 param.crr_id = i;
2826
2827 sctp_addto_chunk(retval, paramlen, &param);
2828 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2829
2830 addr_buf += af->sockaddr_len;
2831 }
8a07eb0a
MH		 2832 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2833 addr = asoc->asconf_addr_del_pending;
2834 af = sctp_get_af_specific(addr->v4.sin_family);
2835 addr_param_len = af->to_addr_param(addr, &addr_param);
2836 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2837 param.param_hdr.length = htons(paramlen + addr_param_len);
2838 param.crr_id = i;
2839
2840 sctp_addto_chunk(retval, paramlen, &param);
2841 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2842 }
1da177e4
LT		 2843 return retval;
2844}
2845
2846/* ADDIP
2847 * 3.2.4 Set Primary IP Address
2848 * 0 1 2 3
2849 * 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
2850 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2851 * | Type =0xC004 | Length = Variable |
2852 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2853 * | ASCONF-Request Correlation ID |
2854 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2855 * | Address Parameter |
2856 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2857 *
d808ad9a 2858 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2859 */
2860struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2861 union sctp_addr *addr)
2862{
2863 sctp_addip_param_t param;
2864 struct sctp_chunk *retval;
2865 int len = sizeof(param);
2866 union sctp_addr_param addrparam;
2867 int addrlen;
2868 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2869
2870 addrlen = af->to_addr_param(addr, &addrparam);
2871 if (!addrlen)
2872 return NULL;
2873 len += addrlen;
2874
2875 /* Create the chunk and make asconf header. */
2876 retval = sctp_make_asconf(asoc, addr, len);
2877 if (!retval)
2878 return NULL;
2879
2880 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2881 param.param_hdr.length = htons(len);
2882 param.crr_id = 0;
2883
2884 sctp_addto_chunk(retval, sizeof(param), &param);
2885 sctp_addto_chunk(retval, addrlen, &addrparam);
2886
2887 return retval;
2888}
2889
2890/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2891 * 0 1 2 3
2892 * 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
2893 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2894 * | Type = 0x80 | Chunk Flags | Chunk Length |
2895 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2896 * | Serial Number |
2897 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2898 * | ASCONF Parameter Response#1 |
2899 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2900 * \ \
2901 * / .... /
2902 * \ \
2903 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2904 * | ASCONF Parameter Response#N |
2905 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2906 *
d808ad9a 2907 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2908 */
2909static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2910 __u32 serial, int vparam_len)
2911{
2912 sctp_addiphdr_t asconf;
2913 struct sctp_chunk *retval;
2914 int length = sizeof(asconf) + vparam_len;
2915
2916 /* Create the chunk. */
2917 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2918 if (!retval)
2919 return NULL;
2920
2921 asconf.serial = htonl(serial);
2922
2923 retval->subh.addip_hdr =
2924 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2925
2926 return retval;
2927}
2928
2929/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2930static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2931 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2932{
2933 sctp_addip_param_t ack_param;
2934 sctp_errhdr_t err_param;
2935 int asconf_param_len = 0;
2936 int err_param_len = 0;
dbc16db1 2937 __be16 response_type;
1da177e4
LT		 2938
2939 if (SCTP_ERROR_NO_ERROR == err_code) {
2940 response_type = SCTP_PARAM_SUCCESS_REPORT;
2941 } else {
2942 response_type = SCTP_PARAM_ERR_CAUSE;
2943 err_param_len = sizeof(err_param);
2944 if (asconf_param)
2945 asconf_param_len =
2946 ntohs(asconf_param->param_hdr.length);
2947 }
2948
d808ad9a 2949 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2950 ack_param.param_hdr.type = response_type;
2951 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2952 err_param_len +
2953 asconf_param_len);
2954 ack_param.crr_id = crr_id;
2955 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2956
2957 if (SCTP_ERROR_NO_ERROR == err_code)
2958 return;
2959
2960 /* Add Error Cause parameter. */
2961 err_param.cause = err_code;
2962 err_param.length = htons(err_param_len + asconf_param_len);
2963 sctp_addto_chunk(chunk, err_param_len, &err_param);
2964
2965 /* Add the failed TLV copied from ASCONF chunk. */
2966 if (asconf_param)
2967 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2968}
2969
2970/* Process a asconf parameter. */
dbc16db1 2971static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2972 struct sctp_chunk *asconf,
2973 sctp_addip_param_t *asconf_param)
2974{
2975 struct sctp_transport *peer;
2976 struct sctp_af *af;
2977 union sctp_addr addr;
1da177e4 2978 union sctp_addr_param *addr_param;
5f242a13 2979
ea110733 2980 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
c1cc678a 2981
44e65c1e
WY		 2982 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2983 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2984 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2985 return SCTP_ERROR_UNKNOWN_PARAM;
2986
6a435732 2987 switch (addr_param->p.type) {
c4492586
WY		 2988 case SCTP_PARAM_IPV6_ADDRESS:
2989 if (!asoc->peer.ipv6_address)
945e5abc 2990 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2991 break;
2992 case SCTP_PARAM_IPV4_ADDRESS:
2993 if (!asoc->peer.ipv4_address)
945e5abc 2994 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2995 break;
2996 default:
945e5abc 2997 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2998 }
2999
6a435732 3000 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
1da177e4 3001 if (unlikely(!af))
945e5abc 3002 return SCTP_ERROR_DNS_FAILED;
1da177e4 3003
dd86d136 3004 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
42e30bf3
VY		 3005
3006 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3007 * or multicast address.
3008 * (note: wildcard is permitted and requires special handling so
3009 * make sure we check for that)
3010 */
3011 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
945e5abc 3012 return SCTP_ERROR_DNS_FAILED;
42e30bf3 3013
1da177e4
LT		 3014 switch (asconf_param->param_hdr.type) {
3015 case SCTP_PARAM_ADD_IP:
42e30bf3
VY		 3016 /* Section 4.2.1:
3017 * If the address 0.0.0.0 or ::0 is provided, the source
3018 * address of the packet MUST be added.
3019 */
3020 if (af->is_any(&addr))
3021 memcpy(&addr, &asconf->source, sizeof(addr));
3022
1da177e4 3023 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 3024 * request and does not have the local resources to add this
3025 * new address to the association, it MUST return an Error
3026 * Cause TLV set to the new error code 'Operation Refused
3027 * Due to Resource Shortage'.
3028 */
1da177e4 3029
dd86d136 3030 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 3031 if (!peer)
3032 return SCTP_ERROR_RSRC_LOW;
3033
3034 /* Start the heartbeat timer. */
3035 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3036 sctp_transport_hold(peer);
6af29ccc 3037 asoc->new_transport = peer;
1da177e4
LT		 3038 break;
3039 case SCTP_PARAM_DEL_IP:
3040 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 3041 * last remaining IP address of a peer endpoint, the receiver
3042 * MUST send an Error Cause TLV with the error cause set to the
3043 * new error code 'Request to Delete Last Remaining IP Address'.
3044 */
42e30bf3 3045 if (asoc->peer.transport_count == 1)
1da177e4
LT		 3046 return SCTP_ERROR_DEL_LAST_IP;
3047
3048 /* ADDIP 4.3 D8) If a request is received to delete an IP
3049 * address which is also the source address of the IP packet
3050 * which contained the ASCONF chunk, the receiver MUST reject
3051 * this request. To reject the request the receiver MUST send
3052 * an Error Cause TLV set to the new error code 'Request to
3053 * Delete Source IP Address'
3054 */
b1364104 3055 if (sctp_cmp_addr_exact(&asconf->source, &addr))
1da177e4
LT		 3056 return SCTP_ERROR_DEL_SRC_IP;
3057
42e30bf3
VY		 3058 /* Section 4.2.2
3059 * If the address 0.0.0.0 or ::0 is provided, all
3060 * addresses of the peer except the source address of the
3061 * packet MUST be deleted.
3062 */
3063 if (af->is_any(&addr)) {
3064 sctp_assoc_set_primary(asoc, asconf->transport);
3065 sctp_assoc_del_nonprimary_peers(asoc,
3066 asconf->transport);
3067 } else
3068 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 3069 break;
3070 case SCTP_PARAM_SET_PRIMARY:
42e30bf3
VY		 3071 /* ADDIP Section 4.2.4
3072 * If the address 0.0.0.0 or ::0 is provided, the receiver
3073 * MAY mark the source address of the packet as its
3074 * primary.
3075 */
3076 if (af->is_any(&addr))
3077 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3078
dd86d136 3079 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4 3080 if (!peer)
945e5abc 3081 return SCTP_ERROR_DNS_FAILED;
1da177e4
LT		 3082
3083 sctp_assoc_set_primary(asoc, peer);
3084 break;
1da177e4
LT		 3085 }
3086
3087 return SCTP_ERROR_NO_ERROR;
3088}
3089
6f4c618d
WY		 3090/* Verify the ASCONF packet before we process it. */
3091int sctp_verify_asconf(const struct sctp_association *asoc,
3092 struct sctp_paramhdr *param_hdr, void *chunk_end,
3093 struct sctp_paramhdr **errp) {
3094 sctp_addip_param_t *asconf_param;
3095 union sctp_params param;
3096 int length, plen;
3097
3098 param.v = (sctp_paramhdr_t *) param_hdr;
3099 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3100 length = ntohs(param.p->length);
3101 *errp = param.p;
3102
3103 if (param.v > chunk_end - length ||
3104 length < sizeof(sctp_paramhdr_t))
3105 return 0;
3106
3107 switch (param.p->type) {
3108 case SCTP_PARAM_ADD_IP:
3109 case SCTP_PARAM_DEL_IP:
3110 case SCTP_PARAM_SET_PRIMARY:
3111 asconf_param = (sctp_addip_param_t *)param.v;
3112 plen = ntohs(asconf_param->param_hdr.length);
3113 if (plen < sizeof(sctp_addip_param_t) +
3114 sizeof(sctp_paramhdr_t))
3115 return 0;
3116 break;
3117 case SCTP_PARAM_SUCCESS_REPORT:
3118 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3119 if (length != sizeof(sctp_addip_param_t))
3120 return 0;
3121
3122 break;
3123 default:
3124 break;
3125 }
3126
3127 param.v += WORD_ROUND(length);
3128 }
3129
3130 if (param.v != chunk_end)
3131 return 0;
3132
3133 return 1;
3134}
3135
d808ad9a 3136/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 3137 * return an ASCONF_ACK chunk to be sent in response.
3138 */
3139struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3140 struct sctp_chunk *asconf)
3141{
3142 sctp_addiphdr_t *hdr;
3143 union sctp_addr_param *addr_param;
3144 sctp_addip_param_t *asconf_param;
3145 struct sctp_chunk *asconf_ack;
3146
dbc16db1 3147 __be16 err_code;
1da177e4 3148 int length = 0;
f3830ccc 3149 int chunk_len;
1da177e4
LT		 3150 __u32 serial;
3151 int all_param_pass = 1;
3152
f3830ccc 3153 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
1da177e4
LT		 3154 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3155 serial = ntohl(hdr->serial);
3156
d808ad9a 3157 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 3158 length = sizeof(sctp_addiphdr_t);
3159 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3160 chunk_len -= length;
3161
3162 /* Skip the address parameter and store a pointer to the first
7aa1b54b 3163 * asconf parameter.
d808ad9a 3164 */
6a435732 3165 length = ntohs(addr_param->p.length);
ea110733 3166 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3167 chunk_len -= length;
3168
d808ad9a 3169 /* create an ASCONF_ACK chunk.
1da177e4 3170 * Based on the definitions of parameters, we know that the size of
2cab86be 3171 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
7aa1b54b 3172 * parameters.
1da177e4 3173 */
2cab86be 3174 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
1da177e4
LT		 3175 if (!asconf_ack)
3176 goto done;
3177
3178 /* Process the TLVs contained within the ASCONF chunk. */
3179 while (chunk_len > 0) {
3180 err_code = sctp_process_asconf_param(asoc, asconf,
3181 asconf_param);
3182 /* ADDIP 4.1 A7)
3183 * If an error response is received for a TLV parameter,
3184 * all TLVs with no response before the failed TLV are
3185 * considered successful if not reported. All TLVs after
3186 * the failed response are considered unsuccessful unless
3187 * a specific success indication is present for the parameter.
3188 */
3189 if (SCTP_ERROR_NO_ERROR != err_code)
3190 all_param_pass = 0;
3191
3192 if (!all_param_pass)
3193 sctp_add_asconf_response(asconf_ack,
3194 asconf_param->crr_id, err_code,
3195 asconf_param);
3196
3197 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3198 * an IP address sends an 'Out of Resource' in its response, it
3199 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 3200 * in the ASCONF.
1da177e4
LT		 3201 */
3202 if (SCTP_ERROR_RSRC_LOW == err_code)
3203 goto done;
3204
3205 /* Move to the next ASCONF param. */
3206 length = ntohs(asconf_param->param_hdr.length);
ea110733 3207 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3208 chunk_len -= length;
3209 }
d808ad9a 3210
1da177e4
LT		 3211done:
3212 asoc->peer.addip_serial++;
3213
3214 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 3215 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 3216 */
3217 if (asconf_ack) {
1da177e4 3218 sctp_chunk_hold(asconf_ack);
a08de64d
VY		 3219 list_add_tail(&asconf_ack->transmitted_list,
3220 &asoc->asconf_ack_list);
1da177e4
LT		 3221 }
3222
3223 return asconf_ack;
3224}
3225
3226/* Process a asconf parameter that is successfully acked. */
425e0f68 3227static void sctp_asconf_param_success(struct sctp_association *asoc,
1da177e4
LT		 3228 sctp_addip_param_t *asconf_param)
3229{
3230 struct sctp_af *af;
3231 union sctp_addr addr;
3232 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3233 union sctp_addr_param *addr_param;
1da177e4 3234 struct sctp_transport *transport;
dc022a98 3235 struct sctp_sockaddr_entry *saddr;
1da177e4 3236
ea110733 3237 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
1da177e4
LT		 3238
3239 /* We have checked the packet before, so we do not check again. */
6a435732 3240 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
dd86d136 3241 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 3242
3243 switch (asconf_param->param_hdr.type) {
3244 case SCTP_PARAM_ADD_IP:
559cf710
VY		 3245 /* This is always done in BH context with a socket lock
3246 * held, so the list can not change.
3247 */
0ed90fb0 3248 local_bh_disable();
559cf710 3249 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 3250 if (sctp_cmp_addr_exact(&saddr->a, &addr))
f57d96b2 3251 saddr->state = SCTP_ADDR_SRC;
dc022a98 3252 }
0ed90fb0 3253 local_bh_enable();
3cd9749c
WY		 3254 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3255 transports) {
3cd9749c 3256 dst_release(transport->dst);
c6ef006b 3257 transport->dst = NULL;
3cd9749c 3258 }
1da177e4
LT		 3259 break;
3260 case SCTP_PARAM_DEL_IP:
0ed90fb0 3261 local_bh_disable();
425e0f68 3262 sctp_del_bind_addr(bp, &addr);
8a07eb0a
MH		 3263 if (asoc->asconf_addr_del_pending != NULL &&
3264 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3265 kfree(asoc->asconf_addr_del_pending);
3266 asoc->asconf_addr_del_pending = NULL;
3267 }
0ed90fb0 3268 local_bh_enable();
9dbc15f0
RD		 3269 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3270 transports) {
dc022a98 3271 dst_release(transport->dst);
c6ef006b 3272 transport->dst = NULL;
1da177e4
LT		 3273 }
3274 break;
3275 default:
3276 break;
3277 }
1da177e4
LT		 3278}
3279
3280/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3281 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 3282 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 3283 * ADDIP 4.1
3284 * A7) If an error response is received for a TLV parameter, all TLVs with no
3285 * response before the failed TLV are considered successful if not reported.
3286 * All TLVs after the failed response are considered unsuccessful unless a
3287 * specific success indication is present for the parameter.
3288 */
dbc16db1 3289static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 3290 sctp_addip_param_t *asconf_param,
3291 int no_err)
3292{
3293 sctp_addip_param_t *asconf_ack_param;
3294 sctp_errhdr_t *err_param;
3295 int length;
f3830ccc 3296 int asconf_ack_len;
dbc16db1 3297 __be16 err_code;
1da177e4
LT		 3298
3299 if (no_err)
3300 err_code = SCTP_ERROR_NO_ERROR;
3301 else
3302 err_code = SCTP_ERROR_REQ_REFUSED;
3303
f3830ccc
WY		 3304 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3305 sizeof(sctp_chunkhdr_t);
3306
1da177e4
LT		 3307 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3308 * the first asconf_ack parameter.
d808ad9a 3309 */
1da177e4
LT		 3310 length = sizeof(sctp_addiphdr_t);
3311 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3312 length);
3313 asconf_ack_len -= length;
3314
3315 while (asconf_ack_len > 0) {
3316 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3317 switch(asconf_ack_param->param_hdr.type) {
3318 case SCTP_PARAM_SUCCESS_REPORT:
3319 return SCTP_ERROR_NO_ERROR;
3320 case SCTP_PARAM_ERR_CAUSE:
3321 length = sizeof(sctp_addip_param_t);
ea110733 3322 err_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3323 asconf_ack_len -= length;
3324 if (asconf_ack_len > 0)
3325 return err_param->cause;
3326 else
3327 return SCTP_ERROR_INV_PARAM;
3328 break;
3329 default:
3330 return SCTP_ERROR_INV_PARAM;
3331 }
3332 }
3333
3334 length = ntohs(asconf_ack_param->param_hdr.length);
ea110733 3335 asconf_ack_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3336 asconf_ack_len -= length;
3337 }
3338
3339 return err_code;
3340}
3341
3342/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3343int sctp_process_asconf_ack(struct sctp_association *asoc,
3344 struct sctp_chunk *asconf_ack)
3345{
3346 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3347 union sctp_addr_param *addr_param;
3348 sctp_addip_param_t *asconf_param;
3349 int length = 0;
3350 int asconf_len = asconf->skb->len;
3351 int all_param_pass = 0;
3352 int no_err = 1;
3353 int retval = 0;
dbc16db1 3354 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3355
3356 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3357 * a pointer to address parameter.
d808ad9a 3358 */
1da177e4
LT		 3359 length = sizeof(sctp_addip_chunk_t);
3360 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3361 asconf_len -= length;
3362
3363 /* Skip the address parameter in the last asconf sent and store a
7aa1b54b 3364 * pointer to the first asconf parameter.
d808ad9a 3365 */
6a435732 3366 length = ntohs(addr_param->p.length);
ea110733 3367 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3368 asconf_len -= length;
3369
3370 /* ADDIP 4.1
3371 * A8) If there is no response(s) to specific TLV parameter(s), and no
3372 * failures are indicated, then all request(s) are considered
3373 * successful.
3374 */
3375 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3376 all_param_pass = 1;
3377
3378 /* Process the TLVs contained in the last sent ASCONF chunk. */
3379 while (asconf_len > 0) {
3380 if (all_param_pass)
3381 err_code = SCTP_ERROR_NO_ERROR;
3382 else {
3383 err_code = sctp_get_asconf_response(asconf_ack,
3384 asconf_param,
3385 no_err);
3386 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3387 no_err = 0;
3388 }
3389
3390 switch (err_code) {
3391 case SCTP_ERROR_NO_ERROR:
425e0f68 3392 sctp_asconf_param_success(asoc, asconf_param);
1da177e4
LT		 3393 break;
3394
3395 case SCTP_ERROR_RSRC_LOW:
3396 retval = 1;
3397 break;
3398
a987f762 3399 case SCTP_ERROR_UNKNOWN_PARAM:
1da177e4
LT		 3400 /* Disable sending this type of asconf parameter in
3401 * future.
d808ad9a 3402 */
1da177e4
LT		 3403 asoc->peer.addip_disabled_mask |=
3404 asconf_param->param_hdr.type;
3405 break;
3406
3407 case SCTP_ERROR_REQ_REFUSED:
3408 case SCTP_ERROR_DEL_LAST_IP:
3409 case SCTP_ERROR_DEL_SRC_IP:
3410 default:
3411 break;
3412 }
3413
3414 /* Skip the processed asconf parameter and move to the next
3415 * one.
d808ad9a 3416 */
1da177e4 3417 length = ntohs(asconf_param->param_hdr.length);
ea110733 3418 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3419 asconf_len -= length;
3420 }
3421
ddc4bbee 3422 if (no_err && asoc->src_out_of_asoc_ok) {
8a07eb0a 3423 asoc->src_out_of_asoc_ok = 0;
ddc4bbee
MH		 3424 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3425 }
8a07eb0a 3426
1da177e4 3427 /* Free the cached last sent asconf chunk. */
5f9646c3 3428 list_del_init(&asconf->transmitted_list);
1da177e4
LT		 3429 sctp_chunk_free(asconf);
3430 asoc->addip_last_asconf = NULL;
3431
1da177e4
LT		 3432 return retval;
3433}
3434
d808ad9a 3435/* Make a FWD TSN chunk. */
1da177e4
LT		 3436struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3437 __u32 new_cum_tsn, size_t nstreams,
3438 struct sctp_fwdtsn_skip *skiplist)
3439{
3440 struct sctp_chunk *retval = NULL;
d808ad9a 3441 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3442 struct sctp_fwdtsn_skip skip;
3443 size_t hint;
3444 int i;
3445
3446 hint = (nstreams + 1) * sizeof(__u32);
3447
1da177e4
LT		 3448 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3449
3450 if (!retval)
3451 return NULL;
3452
1da177e4
LT		 3453 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3454 retval->subh.fwdtsn_hdr =
3455 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3456
3457 for (i = 0; i < nstreams; i++) {
3458 skip.stream = skiplist[i].stream;
3459 skip.ssn = skiplist[i].ssn;
3460 sctp_addto_chunk(retval, sizeof(skip), &skip);
3461 }
3462
3463 return retval;
3464}
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