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net: sctp: trivial: update mailing list address
[linux-block.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):
91705c61 32 * lksctp developers <linux-sctp@vger.kernel.org>
1da177e4
LT		 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 743 ctsn = sctp_tsnmap_get_ctsn(map);
bb33381d
DB		 744
745 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
1da177e4
LT		 746
747 /* How much room is needed in the chunk? */
02015180 748 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
1da177e4
LT		 749 num_dup_tsns = sctp_tsnmap_num_dups(map);
750
751 /* Initialize the SACK header. */
752 sack.cum_tsn_ack = htonl(ctsn);
753 sack.a_rwnd = htonl(asoc->a_rwnd);
754 sack.num_gap_ack_blocks = htons(num_gabs);
755 sack.num_dup_tsns = htons(num_dup_tsns);
756
757 len = sizeof(sack)
758 + sizeof(struct sctp_gap_ack_block) * num_gabs
759 + sizeof(__u32) * num_dup_tsns;
760
761 /* Create the chunk. */
762 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
763 if (!retval)
764 goto nodata;
765
766 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
767 *
768 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
769 * HEARTBEAT ACK, etc.) to the same destination transport
770 * address from which it received the DATA or control chunk to
771 * which it is replying. This rule should also be followed if
772 * the endpoint is bundling DATA chunks together with the
773 * reply chunk.
774 *
775 * However, when acknowledging multiple DATA chunks received
776 * in packets from different source addresses in a single
777 * SACK, the SACK chunk may be transmitted to one of the
778 * destination transport addresses from which the DATA or
779 * control chunks being acknowledged were received.
780 *
781 * [BUG: We do not implement the following paragraph.
782 * Perhaps we should remember the last transport we used for a
783 * SACK and avoid that (if possible) if we have seen any
784 * duplicates. --piggy]
785 *
786 * When a receiver of a duplicate DATA chunk sends a SACK to a
787 * multi- homed endpoint it MAY be beneficial to vary the
788 * destination address and not use the source address of the
789 * DATA chunk. The reason being that receiving a duplicate
790 * from a multi-homed endpoint might indicate that the return
791 * path (as specified in the source address of the DATA chunk)
792 * for the SACK is broken.
793 *
794 * [Send to the address from which we last received a DATA chunk.]
795 */
796 retval->transport = asoc->peer.last_data_from;
797
798 retval->subh.sack_hdr =
799 sctp_addto_chunk(retval, sizeof(sack), &sack);
800
801 /* Add the gap ack block information. */
802 if (num_gabs)
803 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
02015180 804 gabs);
1da177e4
LT		 805
806 /* Add the duplicate TSN information. */
196d6759
MB		 807 if (num_dup_tsns) {
808 aptr->stats.idupchunks += num_dup_tsns;
1da177e4
LT		 809 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
810 sctp_tsnmap_get_dups(map));
196d6759 811 }
4244854d
NH		 812 /* Once we have a sack generated, check to see what our sack
813 * generation is, if its 0, reset the transports to 0, and reset
814 * the association generation to 1
815 *
816 * The idea is that zero is never used as a valid generation for the
817 * association so no transport will match after a wrap event like this,
818 * Until the next sack
819 */
820 if (++aptr->peer.sack_generation == 0) {
821 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
822 transports)
823 trans->sack_generation = 0;
824 aptr->peer.sack_generation = 1;
825 }
1da177e4
LT		 826nodata:
827 return retval;
828}
829
830/* Make a SHUTDOWN chunk. */
831struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
832 const struct sctp_chunk *chunk)
833{
834 struct sctp_chunk *retval;
835 sctp_shutdownhdr_t shut;
836 __u32 ctsn;
837
838 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
839 shut.cum_tsn_ack = htonl(ctsn);
840
841 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
842 sizeof(sctp_shutdownhdr_t));
843 if (!retval)
844 goto nodata;
845
846 retval->subh.shutdown_hdr =
847 sctp_addto_chunk(retval, sizeof(shut), &shut);
848
849 if (chunk)
850 retval->transport = chunk->transport;
851nodata:
852 return retval;
853}
854
855struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
856 const struct sctp_chunk *chunk)
857{
858 struct sctp_chunk *retval;
859
860 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
861
862 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
863 *
864 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
865 * HEARTBEAT ACK, * etc.) to the same destination transport
866 * address from which it * received the DATA or control chunk
867 * to which it is replying.
868 *
869 * [ACK back to where the SHUTDOWN came from.]
870 */
871 if (retval && chunk)
872 retval->transport = chunk->transport;
873
874 return retval;
875}
876
877struct sctp_chunk *sctp_make_shutdown_complete(
878 const struct sctp_association *asoc,
879 const struct sctp_chunk *chunk)
880{
881 struct sctp_chunk *retval;
882 __u8 flags = 0;
883
047a2428
JF		 884 /* Set the T-bit if we have no association (vtag will be
885 * reflected)
886 */
1da177e4
LT		 887 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
888
889 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
890
891 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
892 *
893 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
894 * HEARTBEAT ACK, * etc.) to the same destination transport
895 * address from which it * received the DATA or control chunk
896 * to which it is replying.
897 *
898 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
899 * came from.]
900 */
901 if (retval && chunk)
902 retval->transport = chunk->transport;
903
d808ad9a 904 return retval;
1da177e4
LT		 905}
906
907/* Create an ABORT. Note that we set the T bit if we have no
047a2428 908 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 909 */
910struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
911 const struct sctp_chunk *chunk,
912 const size_t hint)
913{
914 struct sctp_chunk *retval;
915 __u8 flags = 0;
916
047a2428
JF		 917 /* Set the T-bit if we have no association and 'chunk' is not
918 * an INIT (vtag will be reflected).
919 */
920 if (!asoc) {
921 if (chunk && chunk->chunk_hdr &&
922 chunk->chunk_hdr->type == SCTP_CID_INIT)
923 flags = 0;
924 else
925 flags = SCTP_CHUNK_FLAG_T;
926 }
1da177e4
LT		 927
928 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
929
930 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
931 *
932 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
933 * HEARTBEAT ACK, * etc.) to the same destination transport
934 * address from which it * received the DATA or control chunk
935 * to which it is replying.
936 *
937 * [ABORT back to where the offender came from.]
938 */
939 if (retval && chunk)
940 retval->transport = chunk->transport;
941
942 return retval;
943}
944
945/* Helper to create ABORT with a NO_USER_DATA error. */
946struct sctp_chunk *sctp_make_abort_no_data(
947 const struct sctp_association *asoc,
948 const struct sctp_chunk *chunk, __u32 tsn)
949{
950 struct sctp_chunk *retval;
9f81bcd9 951 __be32 payload;
1da177e4
LT		 952
953 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
954 + sizeof(tsn));
955
956 if (!retval)
957 goto no_mem;
958
959 /* Put the tsn back into network byte order. */
960 payload = htonl(tsn);
00f1c2df
WY		 961 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
962 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1da177e4
LT		 963
964 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
965 *
966 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
967 * HEARTBEAT ACK, * etc.) to the same destination transport
968 * address from which it * received the DATA or control chunk
969 * to which it is replying.
970 *
971 * [ABORT back to where the offender came from.]
972 */
973 if (chunk)
974 retval->transport = chunk->transport;
975
976no_mem:
977 return retval;
978}
979
980/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
981struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 982 const struct msghdr *msg,
983 size_t paylen)
1da177e4
LT		 984{
985 struct sctp_chunk *retval;
c164a9ba
SS		 986 void *payload = NULL;
987 int err;
1da177e4 988
c164a9ba 989 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 990 if (!retval)
991 goto err_chunk;
992
993 if (paylen) {
994 /* Put the msg_iov together into payload. */
c164a9ba 995 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 996 if (!payload)
997 goto err_payload;
c164a9ba
SS		 998
999 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
1000 if (err < 0)
1001 goto err_copy;
1da177e4
LT		 1002 }
1003
00f1c2df
WY		 1004 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1005 sctp_addto_chunk(retval, paylen, payload);
1da177e4
LT		 1006
1007 if (paylen)
1008 kfree(payload);
1009
1010 return retval;
1011
1012err_copy:
1013 kfree(payload);
1014err_payload:
1015 sctp_chunk_free(retval);
1016 retval = NULL;
1017err_chunk:
1018 return retval;
1019}
1020
5c94bf86
AB		 1021/* Append bytes to the end of a parameter. Will panic if chunk is not big
1022 * enough.
1023 */
1024static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1025 const void *data)
1026{
1027 void *target;
1028 int chunklen = ntohs(chunk->chunk_hdr->length);
1029
1030 target = skb_put(chunk->skb, len);
1031
6383cfb3
VY		 1032 if (data)
1033 memcpy(target, data, len);
1034 else
1035 memset(target, 0, len);
5c94bf86
AB		 1036
1037 /* Adjust the chunk length field. */
1038 chunk->chunk_hdr->length = htons(chunklen + len);
1039 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1040
1041 return target;
1042}
1043
d808ad9a 1044/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1da177e4
LT		 1045struct sctp_chunk *sctp_make_abort_violation(
1046 const struct sctp_association *asoc,
1047 const struct sctp_chunk *chunk,
1048 const __u8 *payload,
1049 const size_t paylen)
1050{
1051 struct sctp_chunk *retval;
1052 struct sctp_paramhdr phdr;
1053
1054 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
00f1c2df 1055 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1056 if (!retval)
1057 goto end;
1058
00f1c2df
WY		 1059 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1060 + sizeof(sctp_paramhdr_t));
1da177e4
LT		 1061
1062 phdr.type = htons(chunk->chunk_hdr->type);
1063 phdr.length = chunk->chunk_hdr->length;
00f1c2df
WY		 1064 sctp_addto_chunk(retval, paylen, payload);
1065 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1da177e4
LT		 1066
1067end:
1068 return retval;
1069}
1070
ba016670
WY		 1071struct sctp_chunk *sctp_make_violation_paramlen(
1072 const struct sctp_association *asoc,
1073 const struct sctp_chunk *chunk,
1074 struct sctp_paramhdr *param)
1075{
1076 struct sctp_chunk *retval;
1077 static const char error[] = "The following parameter had invalid length:";
1078 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1079 sizeof(sctp_paramhdr_t);
1080
1081 retval = sctp_make_abort(asoc, chunk, payload_len);
1082 if (!retval)
1083 goto nodata;
1084
1085 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1086 sizeof(error) + sizeof(sctp_paramhdr_t));
1087 sctp_addto_chunk(retval, sizeof(error), error);
1088 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1089
1090nodata:
1091 return retval;
1092}
1093
de4594a5
NH		 1094struct sctp_chunk *sctp_make_violation_max_retrans(
1095 const struct sctp_association *asoc,
1096 const struct sctp_chunk *chunk)
1097{
1098 struct sctp_chunk *retval;
1099 static const char error[] = "Association exceeded its max_retans count";
1100 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1101
1102 retval = sctp_make_abort(asoc, chunk, payload_len);
1103 if (!retval)
1104 goto nodata;
1105
1106 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1107 sctp_addto_chunk(retval, sizeof(error), error);
1108
1109nodata:
1110 return retval;
1111}
1112
1da177e4
LT		 1113/* Make a HEARTBEAT chunk. */
1114struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
92c73af5 1115 const struct sctp_transport *transport)
1da177e4 1116{
92c73af5
WY		 1117 struct sctp_chunk *retval;
1118 sctp_sender_hb_info_t hbinfo;
1119
1120 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
1da177e4
LT		 1121
1122 if (!retval)
1123 goto nodata;
1124
92c73af5
WY		 1125 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1126 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1127 hbinfo.daddr = transport->ipaddr;
1128 hbinfo.sent_at = jiffies;
1129 hbinfo.hb_nonce = transport->hb_nonce;
1130
1da177e4
LT		 1131 /* Cast away the 'const', as this is just telling the chunk
1132 * what transport it belongs to.
1133 */
1134 retval->transport = (struct sctp_transport *) transport;
92c73af5
WY		 1135 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1136 &hbinfo);
1da177e4
LT		 1137
1138nodata:
1139 return retval;
1140}
1141
1142struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1143 const struct sctp_chunk *chunk,
1144 const void *payload, const size_t paylen)
1145{
1146 struct sctp_chunk *retval;
1147
1148 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1149 if (!retval)
1150 goto nodata;
1151
1152 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1153
1154 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1155 *
1156 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1157 * HEARTBEAT ACK, * etc.) to the same destination transport
1158 * address from which it * received the DATA or control chunk
1159 * to which it is replying.
1160 *
1161 * [HBACK back to where the HEARTBEAT came from.]
1162 */
1163 if (chunk)
1164 retval->transport = chunk->transport;
1165
1166nodata:
1167 return retval;
1168}
1169
1170/* Create an Operation Error chunk with the specified space reserved.
1171 * This routine can be used for containing multiple causes in the chunk.
1172 */
1173static struct sctp_chunk *sctp_make_op_error_space(
1174 const struct sctp_association *asoc,
1175 const struct sctp_chunk *chunk,
1176 size_t size)
1177{
1178 struct sctp_chunk *retval;
1179
1180 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1181 sizeof(sctp_errhdr_t) + size);
1182 if (!retval)
1183 goto nodata;
1184
1185 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1186 *
1187 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1188 * HEARTBEAT ACK, etc.) to the same destination transport
1189 * address from which it received the DATA or control chunk
1190 * to which it is replying.
1191 *
1192 */
1193 if (chunk)
1194 retval->transport = chunk->transport;
1195
1196nodata:
1197 return retval;
1198}
1199
5fa782c2
NH		 1200/* Create an Operation Error chunk of a fixed size,
1201 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1202 * This is a helper function to allocate an error chunk for
1203 * for those invalid parameter codes in which we may not want
d82603c6 1204 * to report all the errors, if the incoming chunk is large
5fa782c2
NH		 1205 */
1206static inline struct sctp_chunk *sctp_make_op_error_fixed(
1207 const struct sctp_association *asoc,
1208 const struct sctp_chunk *chunk)
1209{
1210 size_t size = asoc ? asoc->pathmtu : 0;
1211
1212 if (!size)
1213 size = SCTP_DEFAULT_MAXSEGMENT;
1214
1215 return sctp_make_op_error_space(asoc, chunk, size);
1216}
1217
1da177e4
LT		 1218/* Create an Operation Error chunk. */
1219struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1220 const struct sctp_chunk *chunk,
63706c5c 1221 __be16 cause_code, const void *payload,
6383cfb3 1222 size_t paylen, size_t reserve_tail)
1da177e4
LT		 1223{
1224 struct sctp_chunk *retval;
1225
6383cfb3 1226 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1da177e4
LT		 1227 if (!retval)
1228 goto nodata;
1229
6383cfb3 1230 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
00f1c2df 1231 sctp_addto_chunk(retval, paylen, payload);
6383cfb3
VY		 1232 if (reserve_tail)
1233 sctp_addto_param(retval, reserve_tail, NULL);
1da177e4
LT		 1234
1235nodata:
1236 return retval;
1237}
1238
4cd57c80
VY		 1239struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1240{
1241 struct sctp_chunk *retval;
1242 struct sctp_hmac *hmac_desc;
1243 struct sctp_authhdr auth_hdr;
1244 __u8 *hmac;
1245
1246 /* Get the first hmac that the peer told us to use */
1247 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1248 if (unlikely(!hmac_desc))
1249 return NULL;
1250
1251 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1252 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1253 if (!retval)
1254 return NULL;
1255
1256 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1257 auth_hdr.shkey_id = htons(asoc->active_key_id);
1258
1259 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1260 &auth_hdr);
1261
1262 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1263 memset(hmac, 0, hmac_desc->hmac_len);
1264
1265 /* Adjust the chunk header to include the empty MAC */
1266 retval->chunk_hdr->length =
1267 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1268 retval->chunk_end = skb_tail_pointer(retval->skb);
1269
1270 return retval;
1271}
1272
1273
1da177e4
LT		 1274/********************************************************************
1275 * 2nd Level Abstractions
1276 ********************************************************************/
1277
1278/* Turn an skb into a chunk.
1279 * FIXME: Eventually move the structure directly inside the skb->cb[].
1280 */
1281struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1282 const struct sctp_association *asoc,
1283 struct sock *sk)
1284{
1285 struct sctp_chunk *retval;
1286
c3762229 1287 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1da177e4
LT		 1288
1289 if (!retval)
1290 goto nodata;
bb33381d
DB		 1291 if (!sk)
1292 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1da177e4 1293
79af02c2 1294 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 1295 retval->skb = skb;
1296 retval->asoc = (struct sctp_association *)asoc;
1da177e4
LT		 1297 retval->has_tsn = 0;
1298 retval->has_ssn = 0;
1299 retval->rtt_in_progress = 0;
1300 retval->sent_at = 0;
1301 retval->singleton = 1;
1302 retval->end_of_packet = 0;
1303 retval->ecn_ce_done = 0;
1304 retval->pdiscard = 0;
1305
1306 /* sctpimpguide-05.txt Section 2.8.2
1307 * M1) Each time a new DATA chunk is transmitted
1308 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1309 * 'TSN.Missing.Report' count will be used to determine missing chunks
1310 * and when to fast retransmit.
1311 */
1312 retval->tsn_missing_report = 0;
1313 retval->tsn_gap_acked = 0;
c226ef9b 1314 retval->fast_retransmit = SCTP_CAN_FRTX;
1da177e4
LT		 1315
1316 /* If this is a fragmented message, track all fragments
1317 * of the message (for SEND_FAILED).
1318 */
1319 retval->msg = NULL;
1320
1321 /* Polish the bead hole. */
1322 INIT_LIST_HEAD(&retval->transmitted_list);
1323 INIT_LIST_HEAD(&retval->frag_list);
1324 SCTP_DBG_OBJCNT_INC(chunk);
1325 atomic_set(&retval->refcnt, 1);
1326
1327nodata:
1328 return retval;
1329}
1330
1331/* Set chunk->source and dest based on the IP header in chunk->skb. */
1332void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1333 union sctp_addr *dest)
1334{
f235fca3 1335 memcpy(&chunk->source, src, sizeof(union sctp_addr));
16b0a030 1336 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1da177e4
LT		 1337}
1338
1339/* Extract the source address from a chunk. */
1340const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1341{
1342 /* If we have a known transport, use that. */
1343 if (chunk->transport) {
6a1e5f33 1344 return &chunk->transport->ipaddr;
1da177e4
LT		 1345 } else {
1346 /* Otherwise, extract it from the IP header. */
6a1e5f33 1347 return &chunk->source;
1da177e4
LT		 1348 }
1349}
1350
1351/* Create a new chunk, setting the type and flags headers from the
1352 * arguments, reserving enough space for a 'paylen' byte payload.
1353 */
dda91928
DB		 1354static struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1355 __u8 type, __u8 flags, int paylen)
1da177e4
LT		 1356{
1357 struct sctp_chunk *retval;
1358 sctp_chunkhdr_t *chunk_hdr;
1359 struct sk_buff *skb;
1360 struct sock *sk;
1361
1362 /* No need to allocate LL here, as this is only a chunk. */
1363 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1364 GFP_ATOMIC);
1365 if (!skb)
1366 goto nodata;
1367
1368 /* Make room for the chunk header. */
1369 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1370 chunk_hdr->type = type;
1371 chunk_hdr->flags = flags;
1372 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1373
1374 sk = asoc ? asoc->base.sk : NULL;
1375 retval = sctp_chunkify(skb, asoc, sk);
1376 if (!retval) {
1377 kfree_skb(skb);
1378 goto nodata;
1379 }
1380
1381 retval->chunk_hdr = chunk_hdr;
1382 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1383
4cd57c80
VY		 1384 /* Determine if the chunk needs to be authenticated */
1385 if (sctp_auth_send_cid(type, asoc))
1386 retval->auth = 1;
1387
1da177e4
LT		 1388 /* Set the skb to the belonging sock for accounting. */
1389 skb->sk = sk;
1390
1391 return retval;
1392nodata:
1393 return NULL;
1394}
1395
1396
1397/* Release the memory occupied by a chunk. */
1398static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1399{
a08de64d
VY		 1400 BUG_ON(!list_empty(&chunk->list));
1401 list_del_init(&chunk->transmitted_list);
1402
1da177e4
LT		 1403 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1404 dev_kfree_skb(chunk->skb);
1405
1406 SCTP_DBG_OBJCNT_DEC(chunk);
1407 kmem_cache_free(sctp_chunk_cachep, chunk);
1408}
1409
1410/* Possibly, free the chunk. */
1411void sctp_chunk_free(struct sctp_chunk *chunk)
1412{
1da177e4
LT		 1413 /* Release our reference on the message tracker. */
1414 if (chunk->msg)
1415 sctp_datamsg_put(chunk->msg);
1416
1417 sctp_chunk_put(chunk);
1418}
1419
1420/* Grab a reference to the chunk. */
1421void sctp_chunk_hold(struct sctp_chunk *ch)
1422{
1423 atomic_inc(&ch->refcnt);
1424}
1425
1426/* Release a reference to the chunk. */
1427void sctp_chunk_put(struct sctp_chunk *ch)
1428{
1429 if (atomic_dec_and_test(&ch->refcnt))
1430 sctp_chunk_destroy(ch);
1431}
1432
1433/* Append bytes to the end of a chunk. Will panic if chunk is not big
1434 * enough.
1435 */
1436void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1437{
1438 void *target;
1439 void *padding;
1440 int chunklen = ntohs(chunk->chunk_hdr->length);
8d614ade 1441 int padlen = WORD_ROUND(chunklen) - chunklen;
1da177e4
LT		 1442
1443 padding = skb_put(chunk->skb, padlen);
1444 target = skb_put(chunk->skb, len);
1445
1446 memset(padding, 0, padlen);
1447 memcpy(target, data, len);
1448
1449 /* Adjust the chunk length field. */
1450 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
27a884dc 1451 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1452
1453 return target;
1454}
1455
5fa782c2
NH		 1456/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1457 * space in the chunk
1458 */
1459void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1460 int len, const void *data)
1461{
2e3219b5 1462 if (skb_tailroom(chunk->skb) >= len)
5fa782c2
NH		 1463 return sctp_addto_chunk(chunk, len, data);
1464 else
1465 return NULL;
1466}
1467
1da177e4
LT		 1468/* Append bytes from user space to the end of a chunk. Will panic if
1469 * chunk is not big enough.
1470 * Returns a kernel err value.
1471 */
1472int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1473 struct iovec *data)
1474{
1475 __u8 *target;
1476 int err = 0;
1477
1478 /* Make room in chunk for data. */
1479 target = skb_put(chunk->skb, len);
1480
1481 /* Copy data (whole iovec) into chunk */
1482 if ((err = memcpy_fromiovecend(target, data, off, len)))
1483 goto out;
1484
1485 /* Adjust the chunk length field. */
1486 chunk->chunk_hdr->length =
1487 htons(ntohs(chunk->chunk_hdr->length) + len);
27a884dc 1488 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1da177e4
LT		 1489
1490out:
1491 return err;
1492}
1493
1494/* Helper function to assign a TSN if needed. This assumes that both
1495 * the data_hdr and association have already been assigned.
1496 */
1497void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1498{
ab3e5e7b
VY		 1499 struct sctp_datamsg *msg;
1500 struct sctp_chunk *lchunk;
1501 struct sctp_stream *stream;
1da177e4
LT		 1502 __u16 ssn;
1503 __u16 sid;
1504
1505 if (chunk->has_ssn)
1506 return;
1507
ab3e5e7b
VY		 1508 /* All fragments will be on the same stream */
1509 sid = ntohs(chunk->subh.data_hdr->stream);
1510 stream = &chunk->asoc->ssnmap->out;
1da177e4 1511
ab3e5e7b
VY		 1512 /* Now assign the sequence number to the entire message.
1513 * All fragments must have the same stream sequence number.
1514 */
1515 msg = chunk->msg;
1516 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1517 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1518 ssn = 0;
1519 } else {
1520 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1521 ssn = sctp_ssn_next(stream, sid);
1522 else
1523 ssn = sctp_ssn_peek(stream, sid);
1524 }
1525
1526 lchunk->subh.data_hdr->ssn = htons(ssn);
1527 lchunk->has_ssn = 1;
1528 }
1da177e4
LT		 1529}
1530
1531/* Helper function to assign a TSN if needed. This assumes that both
1532 * the data_hdr and association have already been assigned.
1533 */
1534void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1535{
1536 if (!chunk->has_tsn) {
1537 /* This is the last possible instant to
1538 * assign a TSN.
1539 */
1540 chunk->subh.data_hdr->tsn =
1541 htonl(sctp_association_get_next_tsn(chunk->asoc));
1542 chunk->has_tsn = 1;
1543 }
1544}
1545
1546/* Create a CLOSED association to use with an incoming packet. */
1547struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1548 struct sctp_chunk *chunk,
dd0fc66f 1549 gfp_t gfp)
1da177e4
LT		 1550{
1551 struct sctp_association *asoc;
1552 struct sk_buff *skb;
1553 sctp_scope_t scope;
1554 struct sctp_af *af;
1555
1556 /* Create the bare association. */
1557 scope = sctp_scope(sctp_source(chunk));
1558 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1559 if (!asoc)
1560 goto nodata;
1561 asoc->temp = 1;
1562 skb = chunk->skb;
1563 /* Create an entry for the source address of the packet. */
eddc9ec5 1564 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1da177e4
LT		 1565 if (unlikely(!af))
1566 goto fail;
d55c41b1 1567 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1568nodata:
1569 return asoc;
1570
1571fail:
1572 sctp_association_free(asoc);
1573 return NULL;
1574}
1575
1576/* Build a cookie representing asoc.
1577 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1578 */
1579static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1580 const struct sctp_association *asoc,
1581 const struct sctp_chunk *init_chunk,
1582 int *cookie_len,
1583 const __u8 *raw_addrs, int addrs_len)
1584{
1585 sctp_cookie_param_t *retval;
1586 struct sctp_signed_cookie *cookie;
1587 struct scatterlist sg;
1588 int headersize, bodysize;
1da177e4 1589
9834a2bb
VY		 1590 /* Header size is static data prior to the actual cookie, including
1591 * any padding.
1592 */
d808ad9a
YH		 1593 headersize = sizeof(sctp_paramhdr_t) +
1594 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1595 sizeof(struct sctp_cookie));
1da177e4
LT		 1596 bodysize = sizeof(struct sctp_cookie)
1597 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1598
1599 /* Pad out the cookie to a multiple to make the signature
1600 * functions simpler to write.
1601 */
1602 if (bodysize % SCTP_COOKIE_MULTIPLE)
1603 bodysize += SCTP_COOKIE_MULTIPLE
1604 - (bodysize % SCTP_COOKIE_MULTIPLE);
1605 *cookie_len = headersize + bodysize;
1606
1da177e4
LT		 1607 /* Clear this memory since we are sending this data structure
1608 * out on the network.
1609 */
af997d8c
ACM		 1610 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1611 if (!retval)
1612 goto nodata;
1613
1da177e4
LT		 1614 cookie = (struct sctp_signed_cookie *) retval->body;
1615
1616 /* Set up the parameter header. */
1617 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1618 retval->p.length = htons(*cookie_len);
1619
1620 /* Copy the cookie part of the association itself. */
1621 cookie->c = asoc->c;
1622 /* Save the raw address list length in the cookie. */
1623 cookie->c.raw_addr_list_len = addrs_len;
1624
1625 /* Remember PR-SCTP capability. */
1626 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1627
0f3fffd8
ISJ		 1628 /* Save adaptation indication in the cookie. */
1629 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1da177e4
LT		 1630
1631 /* Set an expiration time for the cookie. */
52db882f
DB		 1632 cookie->c.expiration = ktime_add(asoc->cookie_life,
1633 ktime_get());
1da177e4
LT		 1634
1635 /* Copy the peer's init packet. */
1636 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1637 ntohs(init_chunk->chunk_hdr->length));
1638
1639 /* Copy the raw local address list of the association. */
1640 memcpy((__u8 *)&cookie->c.peer_init[0] +
1641 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1642
d808ad9a 1643 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1644 struct hash_desc desc;
1645
1da177e4 1646 /* Sign the message. */
68e3f5dd 1647 sg_init_one(&sg, &cookie->c, bodysize);
d808ad9a
YH		 1648 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1649 desc.flags = 0;
1da177e4 1650
570617e7
DB		 1651 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1652 sizeof(ep->secret_key)) ||
1b489e11
HX		 1653 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1654 goto free_cookie;
1da177e4
LT		 1655 }
1656
1da177e4 1657 return retval;
1b489e11
HX		 1658
1659free_cookie:
1660 kfree(retval);
1661nodata:
1662 *cookie_len = 0;
1663 return NULL;
1da177e4
LT		 1664}
1665
1666/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1667struct sctp_association *sctp_unpack_cookie(
1668 const struct sctp_endpoint *ep,
1669 const struct sctp_association *asoc,
dd0fc66f 1670 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1671 int *error, struct sctp_chunk **errp)
1672{
1673 struct sctp_association *retval = NULL;
1674 struct sctp_signed_cookie *cookie;
1675 struct sctp_cookie *bear_cookie;
1676 int headersize, bodysize, fixed_size;
313e7b4d 1677 __u8 *digest = ep->digest;
1da177e4 1678 struct scatterlist sg;
570617e7 1679 unsigned int len;
1da177e4
LT		 1680 sctp_scope_t scope;
1681 struct sk_buff *skb = chunk->skb;
52db882f 1682 ktime_t kt;
1b489e11 1683 struct hash_desc desc;
1da177e4 1684
9834a2bb
VY		 1685 /* Header size is static data prior to the actual cookie, including
1686 * any padding.
1687 */
1688 headersize = sizeof(sctp_chunkhdr_t) +
d808ad9a 1689 (sizeof(struct sctp_signed_cookie) -
9834a2bb 1690 sizeof(struct sctp_cookie));
1da177e4
LT		 1691 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1692 fixed_size = headersize + sizeof(struct sctp_cookie);
1693
1694 /* Verify that the chunk looks like it even has a cookie.
1695 * There must be enough room for our cookie and our peer's
1696 * INIT chunk.
1697 */
1698 len = ntohs(chunk->chunk_hdr->length);
1699 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1700 goto malformed;
1701
1702 /* Verify that the cookie has been padded out. */
1703 if (bodysize % SCTP_COOKIE_MULTIPLE)
1704 goto malformed;
1705
1706 /* Process the cookie. */
1707 cookie = chunk->subh.cookie_hdr;
1708 bear_cookie = &cookie->c;
1709
1710 if (!sctp_sk(ep->base.sk)->hmac)
1711 goto no_hmac;
1712
1713 /* Check the signature. */
68e3f5dd 1714 sg_init_one(&sg, bear_cookie, bodysize);
1b489e11
HX		 1715 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1716 desc.flags = 0;
1da177e4 1717
8ca84481 1718 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
570617e7
DB		 1719 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1720 sizeof(ep->secret_key)) ||
1b489e11
HX		 1721 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1722 *error = -SCTP_IERROR_NOMEM;
1723 goto fail;
1724 }
1da177e4
LT		 1725
1726 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
570617e7
DB		 1727 *error = -SCTP_IERROR_BAD_SIG;
1728 goto fail;
1da177e4
LT		 1729 }
1730
1731no_hmac:
1732 /* IG Section 2.35.2:
1733 * 3) Compare the port numbers and the verification tag contained
1734 * within the COOKIE ECHO chunk to the actual port numbers and the
1735 * verification tag within the SCTP common header of the received
1736 * packet. If these values do not match the packet MUST be silently
1737 * discarded,
1738 */
1739 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1740 *error = -SCTP_IERROR_BAD_TAG;
1741 goto fail;
1742 }
1743
9b1dfad0 1744 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1745 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1746 *error = -SCTP_IERROR_BAD_PORTS;
1747 goto fail;
1748 }
1749
1750 /* Check to see if the cookie is stale. If there is already
1751 * an association, there is no need to check cookie's expiration
1752 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1753 * If skb has been timestamped, then use the stamp, otherwise
1754 * use current time. This introduces a small possibility that
1755 * that a cookie may be considered expired, but his would only slow
1756 * down the new association establishment instead of every packet.
1da177e4 1757 */
f236218b 1758 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
52db882f 1759 kt = skb_get_ktime(skb);
f236218b 1760 else
52db882f 1761 kt = ktime_get();
f236218b 1762
52db882f 1763 if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) {
1da177e4
LT		 1764 /*
1765 * Section 3.3.10.3 Stale Cookie Error (3)
1766 *
1767 * Cause of error
1768 * ---------------
1769 * Stale Cookie Error: Indicates the receipt of a valid State
1770 * Cookie that has expired.
1771 */
1772 len = ntohs(chunk->chunk_hdr->length);
1773 *errp = sctp_make_op_error_space(asoc, chunk, len);
1774 if (*errp) {
52db882f 1775 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
34bcca28 1776 __be32 n = htonl(usecs);
1da177e4 1777
1da177e4 1778 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
00f1c2df
WY		 1779 sizeof(n));
1780 sctp_addto_chunk(*errp, sizeof(n), &n);
1da177e4
LT		 1781 *error = -SCTP_IERROR_STALE_COOKIE;
1782 } else
1783 *error = -SCTP_IERROR_NOMEM;
1784
1785 goto fail;
1786 }
1787
1788 /* Make a new base association. */
1789 scope = sctp_scope(sctp_source(chunk));
1790 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1791 if (!retval) {
1792 *error = -SCTP_IERROR_NOMEM;
1793 goto fail;
1794 }
1795
1796 /* Set up our peer's port number. */
1797 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1798
1799 /* Populate the association from the cookie. */
1800 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1801
1802 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1803 GFP_ATOMIC) < 0) {
1804 *error = -SCTP_IERROR_NOMEM;
1805 goto fail;
1806 }
1807
1808 /* Also, add the destination address. */
1809 if (list_empty(&retval->base.bind_addr.address_list)) {
f57d96b2
VY		 1810 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1811 SCTP_ADDR_SRC, GFP_ATOMIC);
1da177e4
LT		 1812 }
1813
1814 retval->next_tsn = retval->c.initial_tsn;
1815 retval->ctsn_ack_point = retval->next_tsn - 1;
1816 retval->addip_serial = retval->c.initial_tsn;
1817 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1818 retval->peer.prsctp_capable = retval->c.prsctp_capable;
0f3fffd8 1819 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1da177e4
LT		 1820
1821 /* The INIT stuff will be done by the side effects. */
1822 return retval;
1823
1824fail:
1825 if (retval)
1826 sctp_association_free(retval);
1827
1828 return NULL;
1829
1830malformed:
1831 /* Yikes! The packet is either corrupt or deliberately
1832 * malformed.
1833 */
1834 *error = -SCTP_IERROR_MALFORMED;
1835 goto fail;
1836}
1837
1838/********************************************************************
1839 * 3rd Level Abstractions
1840 ********************************************************************/
1841
1842struct __sctp_missing {
9f81bcd9
AV		 1843 __be32 num_missing;
1844 __be16 type;
bc10502d 1845} __packed;
1da177e4
LT		 1846
1847/*
1848 * Report a missing mandatory parameter.
1849 */
1850static int sctp_process_missing_param(const struct sctp_association *asoc,
1851 sctp_param_t paramtype,
1852 struct sctp_chunk *chunk,
1853 struct sctp_chunk **errp)
1854{
1855 struct __sctp_missing report;
1856 __u16 len;
1857
1858 len = WORD_ROUND(sizeof(report));
1859
1860 /* Make an ERROR chunk, preparing enough room for
1861 * returning multiple unknown parameters.
1862 */
1863 if (!*errp)
1864 *errp = sctp_make_op_error_space(asoc, chunk, len);
1865
1866 if (*errp) {
1867 report.num_missing = htonl(1);
1868 report.type = paramtype;
ebdfcad4 1869 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
00f1c2df
WY		 1870 sizeof(report));
1871 sctp_addto_chunk(*errp, sizeof(report), &report);
1da177e4
LT		 1872 }
1873
1874 /* Stop processing this chunk. */
1875 return 0;
1876}
1877
1878/* Report an Invalid Mandatory Parameter. */
1879static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1880 struct sctp_chunk *chunk,
1881 struct sctp_chunk **errp)
1882{
1883 /* Invalid Mandatory Parameter Error has no payload. */
1884
1885 if (!*errp)
1886 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1887
1888 if (*errp)
00f1c2df 1889 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1da177e4
LT		 1890
1891 /* Stop processing this chunk. */
1892 return 0;
1893}
1894
1895static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1896 struct sctp_paramhdr *param,
1897 const struct sctp_chunk *chunk,
1898 struct sctp_chunk **errp)
1899{
7ab90804
VY		 1900 /* This is a fatal error. Any accumulated non-fatal errors are
1901 * not reported.
1902 */
1903 if (*errp)
1904 sctp_chunk_free(*errp);
1905
1da177e4 1906 /* Create an error chunk and fill it in with our payload. */
ba016670 1907 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1da177e4
LT		 1908
1909 return 0;
1910}
1911
1912
1913/* Do not attempt to handle the HOST_NAME parm. However, do
1914 * send back an indicator to the peer.
1915 */
1916static int sctp_process_hn_param(const struct sctp_association *asoc,
1917 union sctp_params param,
1918 struct sctp_chunk *chunk,
1919 struct sctp_chunk **errp)
1920{
1921 __u16 len = ntohs(param.p->length);
1922
7ab90804
VY		 1923 /* Processing of the HOST_NAME parameter will generate an
1924 * ABORT. If we've accumulated any non-fatal errors, they
1925 * would be unrecognized parameters and we should not include
1926 * them in the ABORT.
1927 */
1928 if (*errp)
1929 sctp_chunk_free(*errp);
1930
1931 *errp = sctp_make_op_error_space(asoc, chunk, len);
1da177e4 1932
00f1c2df
WY		 1933 if (*errp) {
1934 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1935 sctp_addto_chunk(*errp, len, param.v);
1936 }
1da177e4
LT		 1937
1938 /* Stop processing this chunk. */
1939 return 0;
1940}
1941
f53b5b09 1942static int sctp_verify_ext_param(struct net *net, union sctp_params param)
d6701191
VY		 1943{
1944 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1945 int have_auth = 0;
1946 int have_asconf = 0;
1947 int i;
1948
1949 for (i = 0; i < num_ext; i++) {
1950 switch (param.ext->chunks[i]) {
1951 case SCTP_CID_AUTH:
1952 have_auth = 1;
1953 break;
1954 case SCTP_CID_ASCONF:
1955 case SCTP_CID_ASCONF_ACK:
1956 have_asconf = 1;
1957 break;
1958 }
1959 }
1960
1961 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1962 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1963 * only if ADD-IP is turned on and we are not backward-compatible
1964 * mode.
1965 */
e1fc3b14 1966 if (net->sctp.addip_noauth)
d6701191
VY		 1967 return 1;
1968
e1fc3b14 1969 if (net->sctp.addip_enable && !have_auth && have_asconf)
d6701191
VY		 1970 return 0;
1971
1972 return 1;
1973}
1974
131a47e3
VY		 1975static void sctp_process_ext_param(struct sctp_association *asoc,
1976 union sctp_params param)
1977{
e1fc3b14 1978 struct net *net = sock_net(asoc->base.sk);
131a47e3
VY		 1979 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1980 int i;
1981
1982 for (i = 0; i < num_ext; i++) {
1983 switch (param.ext->chunks[i]) {
1984 case SCTP_CID_FWD_TSN:
e1fc3b14 1985 if (net->sctp.prsctp_enable &&
131a47e3
VY		 1986 !asoc->peer.prsctp_capable)
1987 asoc->peer.prsctp_capable = 1;
1988 break;
730fc3d0
VY		 1989 case SCTP_CID_AUTH:
1990 /* if the peer reports AUTH, assume that he
1991 * supports AUTH.
1992 */
e1fc3b14 1993 if (net->sctp.auth_enable)
0ef46e28 1994 asoc->peer.auth_capable = 1;
730fc3d0 1995 break;
131a47e3
VY		 1996 case SCTP_CID_ASCONF:
1997 case SCTP_CID_ASCONF_ACK:
e1fc3b14 1998 if (net->sctp.addip_enable)
0ef46e28 1999 asoc->peer.asconf_capable = 1;
6b2f9cb6 2000 break;
131a47e3
VY		 2001 default:
2002 break;
2003 }
2004 }
2005}
2006
1da177e4
LT		 2007/* RFC 3.2.1 & the Implementers Guide 2.2.
2008 *
2009 * The Parameter Types are encoded such that the
2010 * highest-order two bits specify the action that must be
2011 * taken if the processing endpoint does not recognize the
2012 * Parameter Type.
2013 *
7ab90804
VY		 2014 * 00 - Stop processing this parameter; do not process any further
2015 * parameters within this chunk
1da177e4 2016 *
7ab90804
VY		 2017 * 01 - Stop processing this parameter, do not process any further
2018 * parameters within this chunk, and report the unrecognized
2019 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2020 *
2021 * 10 - Skip this parameter and continue processing.
2022 *
2023 * 11 - Skip this parameter and continue processing but
2024 * report the unrecognized parameter in an
7ab90804 2025 * 'Unrecognized Parameter' ERROR chunk.
1da177e4
LT		 2026 *
2027 * Return value:
7ab90804
VY		 2028 * SCTP_IERROR_NO_ERROR - continue with the chunk
2029 * SCTP_IERROR_ERROR - stop and report an error.
2030 * SCTP_IERROR_NOMEME - out of memory.
1da177e4 2031 */
7ab90804
VY		 2032static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2033 union sctp_params param,
2034 struct sctp_chunk *chunk,
2035 struct sctp_chunk **errp)
1da177e4 2036{
7ab90804 2037 int retval = SCTP_IERROR_NO_ERROR;
1da177e4
LT		 2038
2039 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2040 case SCTP_PARAM_ACTION_DISCARD:
7ab90804 2041 retval = SCTP_IERROR_ERROR;
1da177e4
LT		 2042 break;
2043 case SCTP_PARAM_ACTION_SKIP:
2044 break;
7ab90804
VY		 2045 case SCTP_PARAM_ACTION_DISCARD_ERR:
2046 retval = SCTP_IERROR_ERROR;
2047 /* Fall through */
1da177e4
LT		 2048 case SCTP_PARAM_ACTION_SKIP_ERR:
2049 /* Make an ERROR chunk, preparing enough room for
2050 * returning multiple unknown parameters.
2051 */
2052 if (NULL == *errp)
5fa782c2 2053 *errp = sctp_make_op_error_fixed(asoc, chunk);
1da177e4
LT		 2054
2055 if (*errp) {
2205a6ea
JB		 2056 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2057 WORD_ROUND(ntohs(param.p->length))))
2058 sctp_addto_chunk_fixed(*errp,
2059 WORD_ROUND(ntohs(param.p->length)),
2060 param.v);
1da177e4
LT		 2061 } else {
2062 /* If there is no memory for generating the ERROR
2063 * report as specified, an ABORT will be triggered
2064 * to the peer and the association won't be
2065 * established.
2066 */
7ab90804 2067 retval = SCTP_IERROR_NOMEM;
1da177e4 2068 }
1da177e4
LT		 2069 break;
2070 default:
2071 break;
2072 }
2073
2074 return retval;
2075}
2076
7ab90804 2077/* Verify variable length parameters
1da177e4 2078 * Return values:
7ab90804
VY		 2079 * SCTP_IERROR_ABORT - trigger an ABORT
2080 * SCTP_IERROR_NOMEM - out of memory (abort)
2081 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2082 * SCTP_IERROR_NO_ERROR - continue with the chunk
1da177e4 2083 */
f53b5b09
EB		 2084static sctp_ierror_t sctp_verify_param(struct net *net,
2085 const struct sctp_association *asoc,
7ab90804
VY		 2086 union sctp_params param,
2087 sctp_cid_t cid,
2088 struct sctp_chunk *chunk,
2089 struct sctp_chunk **err_chunk)
1da177e4 2090{
72da7b38 2091 struct sctp_hmac_algo_param *hmacs;
7ab90804 2092 int retval = SCTP_IERROR_NO_ERROR;
72da7b38
WY		 2093 __u16 n_elt, id = 0;
2094 int i;
1da177e4
LT		 2095
2096 /* FIXME - This routine is not looking at each parameter per the
2097 * chunk type, i.e., unrecognized parameters should be further
2098 * identified based on the chunk id.
2099 */
2100
2101 switch (param.p->type) {
2102 case SCTP_PARAM_IPV4_ADDRESS:
2103 case SCTP_PARAM_IPV6_ADDRESS:
2104 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2105 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2106 case SCTP_PARAM_STATE_COOKIE:
2107 case SCTP_PARAM_HEARTBEAT_INFO:
2108 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2109 case SCTP_PARAM_ECN_CAPABLE:
0f3fffd8 2110 case SCTP_PARAM_ADAPTATION_LAYER_IND:
d6701191
VY		 2111 break;
2112
131a47e3 2113 case SCTP_PARAM_SUPPORTED_EXT:
f53b5b09 2114 if (!sctp_verify_ext_param(net, param))
d6701191 2115 return SCTP_IERROR_ABORT;
1da177e4
LT		 2116 break;
2117
d6de3097 2118 case SCTP_PARAM_SET_PRIMARY:
e1fc3b14 2119 if (net->sctp.addip_enable)
d6de3097
VY		 2120 break;
2121 goto fallthrough;
2122
1da177e4
LT		 2123 case SCTP_PARAM_HOST_NAME_ADDRESS:
2124 /* Tell the peer, we won't support this param. */
7ab90804
VY		 2125 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2126 retval = SCTP_IERROR_ABORT;
2127 break;
131a47e3 2128
1da177e4 2129 case SCTP_PARAM_FWD_TSN_SUPPORT:
e1fc3b14 2130 if (net->sctp.prsctp_enable)
1da177e4 2131 break;
730fc3d0
VY		 2132 goto fallthrough;
2133
2134 case SCTP_PARAM_RANDOM:
e1fc3b14 2135 if (!net->sctp.auth_enable)
730fc3d0
VY		 2136 goto fallthrough;
2137
2138 /* SCTP-AUTH: Secion 6.1
2139 * If the random number is not 32 byte long the association
2140 * MUST be aborted. The ABORT chunk SHOULD contain the error
2141 * cause 'Protocol Violation'.
2142 */
2143 if (SCTP_AUTH_RANDOM_LENGTH !=
7ab90804
VY		 2144 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2145 sctp_process_inv_paramlength(asoc, param.p,
730fc3d0 2146 chunk, err_chunk);
7ab90804
VY		 2147 retval = SCTP_IERROR_ABORT;
2148 }
730fc3d0
VY		 2149 break;
2150
2151 case SCTP_PARAM_CHUNKS:
e1fc3b14 2152 if (!net->sctp.auth_enable)
730fc3d0
VY		 2153 goto fallthrough;
2154
2155 /* SCTP-AUTH: Section 3.2
2156 * The CHUNKS parameter MUST be included once in the INIT or
2157 * INIT-ACK chunk if the sender wants to receive authenticated
2158 * chunks. Its maximum length is 260 bytes.
2159 */
7ab90804
VY		 2160 if (260 < ntohs(param.p->length)) {
2161 sctp_process_inv_paramlength(asoc, param.p,
2162 chunk, err_chunk);
2163 retval = SCTP_IERROR_ABORT;
2164 }
730fc3d0
VY		 2165 break;
2166
2167 case SCTP_PARAM_HMAC_ALGO:
e1fc3b14 2168 if (!net->sctp.auth_enable)
72da7b38
WY		 2169 goto fallthrough;
2170
2171 hmacs = (struct sctp_hmac_algo_param *)param.p;
2172 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2173
2174 /* SCTP-AUTH: Section 6.1
2175 * The HMAC algorithm based on SHA-1 MUST be supported and
2176 * included in the HMAC-ALGO parameter.
2177 */
2178 for (i = 0; i < n_elt; i++) {
2179 id = ntohs(hmacs->hmac_ids[i]);
2180
2181 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2182 break;
2183 }
2184
2185 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2186 sctp_process_inv_paramlength(asoc, param.p, chunk,
2187 err_chunk);
2188 retval = SCTP_IERROR_ABORT;
2189 }
2190 break;
730fc3d0 2191fallthrough:
1da177e4 2192 default:
bb33381d
DB		 2193 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2194 __func__, ntohs(param.p->type), cid);
2195
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:
bb33381d 2519 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
1da177e4
LT		 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 */
bb33381d
DB		 2665 pr_debug("%s: ignoring param:%d for association:%p.\n",
2666 __func__, ntohs(param.p->type), asoc);
1da177e4 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;
bb33381d
DB		 2808
2809 pr_debug("%s: picked same-scope del_pending addr, "
2810 "totallen for all addresses is %d\n",
2811 __func__, totallen);
8a07eb0a 2812 }
1da177e4
LT		 2813 }
2814
2815 /* Create an asconf chunk with the required length. */
2816 retval = sctp_make_asconf(asoc, laddr, totallen);
2817 if (!retval)
2818 return NULL;
2819
2820 /* Add the address parameters to the asconf chunk. */
2821 addr_buf = addrs;
2822 for (i = 0; i < addrcnt; i++) {
ea110733 2823 addr = addr_buf;
1da177e4
LT		 2824 af = sctp_get_af_specific(addr->v4.sin_family);
2825 addr_param_len = af->to_addr_param(addr, &addr_param);
2826 param.param_hdr.type = flags;
2827 param.param_hdr.length = htons(paramlen + addr_param_len);
2828 param.crr_id = i;
2829
2830 sctp_addto_chunk(retval, paramlen, &param);
2831 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2832
2833 addr_buf += af->sockaddr_len;
2834 }
8a07eb0a
MH		 2835 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2836 addr = asoc->asconf_addr_del_pending;
2837 af = sctp_get_af_specific(addr->v4.sin_family);
2838 addr_param_len = af->to_addr_param(addr, &addr_param);
2839 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2840 param.param_hdr.length = htons(paramlen + addr_param_len);
2841 param.crr_id = i;
2842
2843 sctp_addto_chunk(retval, paramlen, &param);
2844 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2845 }
1da177e4
LT		 2846 return retval;
2847}
2848
2849/* ADDIP
2850 * 3.2.4 Set Primary IP Address
2851 * 0 1 2 3
2852 * 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
2853 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2854 * | Type =0xC004 | Length = Variable |
2855 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2856 * | ASCONF-Request Correlation ID |
2857 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2858 * | Address Parameter |
2859 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2860 *
d808ad9a 2861 * Create an ASCONF chunk with Set Primary IP address parameter.
1da177e4
LT		 2862 */
2863struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2864 union sctp_addr *addr)
2865{
2866 sctp_addip_param_t param;
2867 struct sctp_chunk *retval;
2868 int len = sizeof(param);
2869 union sctp_addr_param addrparam;
2870 int addrlen;
2871 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2872
2873 addrlen = af->to_addr_param(addr, &addrparam);
2874 if (!addrlen)
2875 return NULL;
2876 len += addrlen;
2877
2878 /* Create the chunk and make asconf header. */
2879 retval = sctp_make_asconf(asoc, addr, len);
2880 if (!retval)
2881 return NULL;
2882
2883 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2884 param.param_hdr.length = htons(len);
2885 param.crr_id = 0;
2886
2887 sctp_addto_chunk(retval, sizeof(param), &param);
2888 sctp_addto_chunk(retval, addrlen, &addrparam);
2889
2890 return retval;
2891}
2892
2893/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2894 * 0 1 2 3
2895 * 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
2896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2897 * | Type = 0x80 | Chunk Flags | Chunk Length |
2898 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2899 * | Serial Number |
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | ASCONF Parameter Response#1 |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2903 * \ \
2904 * / .... /
2905 * \ \
2906 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2907 * | ASCONF Parameter Response#N |
2908 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2909 *
d808ad9a 2910 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
1da177e4
LT		 2911 */
2912static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2913 __u32 serial, int vparam_len)
2914{
2915 sctp_addiphdr_t asconf;
2916 struct sctp_chunk *retval;
2917 int length = sizeof(asconf) + vparam_len;
2918
2919 /* Create the chunk. */
2920 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2921 if (!retval)
2922 return NULL;
2923
2924 asconf.serial = htonl(serial);
2925
2926 retval->subh.addip_hdr =
2927 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2928
2929 return retval;
2930}
2931
2932/* Add response parameters to an ASCONF_ACK chunk. */
9f81bcd9 2933static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
dbc16db1 2934 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2935{
2936 sctp_addip_param_t ack_param;
2937 sctp_errhdr_t err_param;
2938 int asconf_param_len = 0;
2939 int err_param_len = 0;
dbc16db1 2940 __be16 response_type;
1da177e4
LT		 2941
2942 if (SCTP_ERROR_NO_ERROR == err_code) {
2943 response_type = SCTP_PARAM_SUCCESS_REPORT;
2944 } else {
2945 response_type = SCTP_PARAM_ERR_CAUSE;
2946 err_param_len = sizeof(err_param);
2947 if (asconf_param)
2948 asconf_param_len =
2949 ntohs(asconf_param->param_hdr.length);
2950 }
2951
d808ad9a 2952 /* Add Success Indication or Error Cause Indication parameter. */
1da177e4
LT		 2953 ack_param.param_hdr.type = response_type;
2954 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2955 err_param_len +
2956 asconf_param_len);
2957 ack_param.crr_id = crr_id;
2958 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2959
2960 if (SCTP_ERROR_NO_ERROR == err_code)
2961 return;
2962
2963 /* Add Error Cause parameter. */
2964 err_param.cause = err_code;
2965 err_param.length = htons(err_param_len + asconf_param_len);
2966 sctp_addto_chunk(chunk, err_param_len, &err_param);
2967
2968 /* Add the failed TLV copied from ASCONF chunk. */
2969 if (asconf_param)
2970 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2971}
2972
2973/* Process a asconf parameter. */
dbc16db1 2974static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2975 struct sctp_chunk *asconf,
2976 sctp_addip_param_t *asconf_param)
2977{
2978 struct sctp_transport *peer;
2979 struct sctp_af *af;
2980 union sctp_addr addr;
1da177e4 2981 union sctp_addr_param *addr_param;
5f242a13 2982
ea110733 2983 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
c1cc678a 2984
44e65c1e
WY		 2985 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2986 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2987 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2988 return SCTP_ERROR_UNKNOWN_PARAM;
2989
6a435732 2990 switch (addr_param->p.type) {
c4492586
WY		 2991 case SCTP_PARAM_IPV6_ADDRESS:
2992 if (!asoc->peer.ipv6_address)
945e5abc 2993 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2994 break;
2995 case SCTP_PARAM_IPV4_ADDRESS:
2996 if (!asoc->peer.ipv4_address)
945e5abc 2997 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 2998 break;
2999 default:
945e5abc 3000 return SCTP_ERROR_DNS_FAILED;
c4492586
WY		 3001 }
3002
6a435732 3003 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
1da177e4 3004 if (unlikely(!af))
945e5abc 3005 return SCTP_ERROR_DNS_FAILED;
1da177e4 3006
dd86d136 3007 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
42e30bf3
VY		 3008
3009 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3010 * or multicast address.
3011 * (note: wildcard is permitted and requires special handling so
3012 * make sure we check for that)
3013 */
3014 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
945e5abc 3015 return SCTP_ERROR_DNS_FAILED;
42e30bf3 3016
1da177e4
LT		 3017 switch (asconf_param->param_hdr.type) {
3018 case SCTP_PARAM_ADD_IP:
42e30bf3
VY		 3019 /* Section 4.2.1:
3020 * If the address 0.0.0.0 or ::0 is provided, the source
3021 * address of the packet MUST be added.
3022 */
3023 if (af->is_any(&addr))
3024 memcpy(&addr, &asconf->source, sizeof(addr));
3025
1da177e4 3026 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
d808ad9a
YH		 3027 * request and does not have the local resources to add this
3028 * new address to the association, it MUST return an Error
3029 * Cause TLV set to the new error code 'Operation Refused
3030 * Due to Resource Shortage'.
3031 */
1da177e4 3032
dd86d136 3033 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 3034 if (!peer)
3035 return SCTP_ERROR_RSRC_LOW;
3036
3037 /* Start the heartbeat timer. */
3038 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3039 sctp_transport_hold(peer);
6af29ccc 3040 asoc->new_transport = peer;
1da177e4
LT		 3041 break;
3042 case SCTP_PARAM_DEL_IP:
3043 /* ADDIP 4.3 D7) If a request is received to delete the
d808ad9a
YH		 3044 * last remaining IP address of a peer endpoint, the receiver
3045 * MUST send an Error Cause TLV with the error cause set to the
3046 * new error code 'Request to Delete Last Remaining IP Address'.
3047 */
42e30bf3 3048 if (asoc->peer.transport_count == 1)
1da177e4
LT		 3049 return SCTP_ERROR_DEL_LAST_IP;
3050
3051 /* ADDIP 4.3 D8) If a request is received to delete an IP
3052 * address which is also the source address of the IP packet
3053 * which contained the ASCONF chunk, the receiver MUST reject
3054 * this request. To reject the request the receiver MUST send
3055 * an Error Cause TLV set to the new error code 'Request to
3056 * Delete Source IP Address'
3057 */
b1364104 3058 if (sctp_cmp_addr_exact(&asconf->source, &addr))
1da177e4
LT		 3059 return SCTP_ERROR_DEL_SRC_IP;
3060
42e30bf3
VY		 3061 /* Section 4.2.2
3062 * If the address 0.0.0.0 or ::0 is provided, all
3063 * addresses of the peer except the source address of the
3064 * packet MUST be deleted.
3065 */
3066 if (af->is_any(&addr)) {
3067 sctp_assoc_set_primary(asoc, asconf->transport);
3068 sctp_assoc_del_nonprimary_peers(asoc,
3069 asconf->transport);
3070 } else
3071 sctp_assoc_del_peer(asoc, &addr);
1da177e4
LT		 3072 break;
3073 case SCTP_PARAM_SET_PRIMARY:
42e30bf3
VY		 3074 /* ADDIP Section 4.2.4
3075 * If the address 0.0.0.0 or ::0 is provided, the receiver
3076 * MAY mark the source address of the packet as its
3077 * primary.
3078 */
3079 if (af->is_any(&addr))
3080 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3081
dd86d136 3082 peer = sctp_assoc_lookup_paddr(asoc, &addr);
1da177e4 3083 if (!peer)
945e5abc 3084 return SCTP_ERROR_DNS_FAILED;
1da177e4
LT		 3085
3086 sctp_assoc_set_primary(asoc, peer);
3087 break;
1da177e4
LT		 3088 }
3089
3090 return SCTP_ERROR_NO_ERROR;
3091}
3092
6f4c618d
WY		 3093/* Verify the ASCONF packet before we process it. */
3094int sctp_verify_asconf(const struct sctp_association *asoc,
3095 struct sctp_paramhdr *param_hdr, void *chunk_end,
3096 struct sctp_paramhdr **errp) {
3097 sctp_addip_param_t *asconf_param;
3098 union sctp_params param;
3099 int length, plen;
3100
3101 param.v = (sctp_paramhdr_t *) param_hdr;
3102 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3103 length = ntohs(param.p->length);
3104 *errp = param.p;
3105
3106 if (param.v > chunk_end - length ||
3107 length < sizeof(sctp_paramhdr_t))
3108 return 0;
3109
3110 switch (param.p->type) {
3111 case SCTP_PARAM_ADD_IP:
3112 case SCTP_PARAM_DEL_IP:
3113 case SCTP_PARAM_SET_PRIMARY:
3114 asconf_param = (sctp_addip_param_t *)param.v;
3115 plen = ntohs(asconf_param->param_hdr.length);
3116 if (plen < sizeof(sctp_addip_param_t) +
3117 sizeof(sctp_paramhdr_t))
3118 return 0;
3119 break;
3120 case SCTP_PARAM_SUCCESS_REPORT:
3121 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3122 if (length != sizeof(sctp_addip_param_t))
3123 return 0;
3124
3125 break;
3126 default:
3127 break;
3128 }
3129
3130 param.v += WORD_ROUND(length);
3131 }
3132
3133 if (param.v != chunk_end)
3134 return 0;
3135
3136 return 1;
3137}
3138
d808ad9a 3139/* Process an incoming ASCONF chunk with the next expected serial no. and
1da177e4
LT		 3140 * return an ASCONF_ACK chunk to be sent in response.
3141 */
3142struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3143 struct sctp_chunk *asconf)
3144{
3145 sctp_addiphdr_t *hdr;
3146 union sctp_addr_param *addr_param;
3147 sctp_addip_param_t *asconf_param;
3148 struct sctp_chunk *asconf_ack;
3149
dbc16db1 3150 __be16 err_code;
1da177e4 3151 int length = 0;
f3830ccc 3152 int chunk_len;
1da177e4
LT		 3153 __u32 serial;
3154 int all_param_pass = 1;
3155
f3830ccc 3156 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
1da177e4
LT		 3157 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3158 serial = ntohl(hdr->serial);
3159
d808ad9a 3160 /* Skip the addiphdr and store a pointer to address parameter. */
1da177e4
LT		 3161 length = sizeof(sctp_addiphdr_t);
3162 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3163 chunk_len -= length;
3164
3165 /* Skip the address parameter and store a pointer to the first
7aa1b54b 3166 * asconf parameter.
d808ad9a 3167 */
6a435732 3168 length = ntohs(addr_param->p.length);
ea110733 3169 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3170 chunk_len -= length;
3171
d808ad9a 3172 /* create an ASCONF_ACK chunk.
1da177e4 3173 * Based on the definitions of parameters, we know that the size of
2cab86be 3174 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
7aa1b54b 3175 * parameters.
1da177e4 3176 */
2cab86be 3177 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
1da177e4
LT		 3178 if (!asconf_ack)
3179 goto done;
3180
3181 /* Process the TLVs contained within the ASCONF chunk. */
3182 while (chunk_len > 0) {
3183 err_code = sctp_process_asconf_param(asoc, asconf,
3184 asconf_param);
3185 /* ADDIP 4.1 A7)
3186 * If an error response is received for a TLV parameter,
3187 * all TLVs with no response before the failed TLV are
3188 * considered successful if not reported. All TLVs after
3189 * the failed response are considered unsuccessful unless
3190 * a specific success indication is present for the parameter.
3191 */
3192 if (SCTP_ERROR_NO_ERROR != err_code)
3193 all_param_pass = 0;
3194
3195 if (!all_param_pass)
3196 sctp_add_asconf_response(asconf_ack,
3197 asconf_param->crr_id, err_code,
3198 asconf_param);
3199
3200 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3201 * an IP address sends an 'Out of Resource' in its response, it
3202 * MUST also fail any subsequent add or delete requests bundled
d808ad9a 3203 * in the ASCONF.
1da177e4
LT		 3204 */
3205 if (SCTP_ERROR_RSRC_LOW == err_code)
3206 goto done;
3207
3208 /* Move to the next ASCONF param. */
3209 length = ntohs(asconf_param->param_hdr.length);
ea110733 3210 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3211 chunk_len -= length;
3212 }
d808ad9a 3213
1da177e4
LT		 3214done:
3215 asoc->peer.addip_serial++;
3216
3217 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
d808ad9a 3218 * after freeing the reference to old asconf ack if any.
1da177e4
LT		 3219 */
3220 if (asconf_ack) {
1da177e4 3221 sctp_chunk_hold(asconf_ack);
a08de64d
VY		 3222 list_add_tail(&asconf_ack->transmitted_list,
3223 &asoc->asconf_ack_list);
1da177e4
LT		 3224 }
3225
3226 return asconf_ack;
3227}
3228
3229/* Process a asconf parameter that is successfully acked. */
425e0f68 3230static void sctp_asconf_param_success(struct sctp_association *asoc,
1da177e4
LT		 3231 sctp_addip_param_t *asconf_param)
3232{
3233 struct sctp_af *af;
3234 union sctp_addr addr;
3235 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3236 union sctp_addr_param *addr_param;
1da177e4 3237 struct sctp_transport *transport;
dc022a98 3238 struct sctp_sockaddr_entry *saddr;
1da177e4 3239
ea110733 3240 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
1da177e4
LT		 3241
3242 /* We have checked the packet before, so we do not check again. */
6a435732 3243 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
dd86d136 3244 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
1da177e4
LT		 3245
3246 switch (asconf_param->param_hdr.type) {
3247 case SCTP_PARAM_ADD_IP:
559cf710
VY		 3248 /* This is always done in BH context with a socket lock
3249 * held, so the list can not change.
3250 */
0ed90fb0 3251 local_bh_disable();
559cf710 3252 list_for_each_entry(saddr, &bp->address_list, list) {
dd86d136 3253 if (sctp_cmp_addr_exact(&saddr->a, &addr))
f57d96b2 3254 saddr->state = SCTP_ADDR_SRC;
dc022a98 3255 }
0ed90fb0 3256 local_bh_enable();
3cd9749c
WY		 3257 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3258 transports) {
3cd9749c 3259 dst_release(transport->dst);
c6ef006b 3260 transport->dst = NULL;
3cd9749c 3261 }
1da177e4
LT		 3262 break;
3263 case SCTP_PARAM_DEL_IP:
0ed90fb0 3264 local_bh_disable();
425e0f68 3265 sctp_del_bind_addr(bp, &addr);
8a07eb0a
MH		 3266 if (asoc->asconf_addr_del_pending != NULL &&
3267 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3268 kfree(asoc->asconf_addr_del_pending);
3269 asoc->asconf_addr_del_pending = NULL;
3270 }
0ed90fb0 3271 local_bh_enable();
9dbc15f0
RD		 3272 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3273 transports) {
dc022a98 3274 dst_release(transport->dst);
c6ef006b 3275 transport->dst = NULL;
1da177e4
LT		 3276 }
3277 break;
3278 default:
3279 break;
3280 }
1da177e4
LT		 3281}
3282
3283/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3284 * for the given asconf parameter. If there is no response for this parameter,
d808ad9a 3285 * return the error code based on the third argument 'no_err'.
1da177e4
LT		 3286 * ADDIP 4.1
3287 * A7) If an error response is received for a TLV parameter, all TLVs with no
3288 * response before the failed TLV are considered successful if not reported.
3289 * All TLVs after the failed response are considered unsuccessful unless a
3290 * specific success indication is present for the parameter.
3291 */
dbc16db1 3292static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 3293 sctp_addip_param_t *asconf_param,
3294 int no_err)
3295{
3296 sctp_addip_param_t *asconf_ack_param;
3297 sctp_errhdr_t *err_param;
3298 int length;
f3830ccc 3299 int asconf_ack_len;
dbc16db1 3300 __be16 err_code;
1da177e4
LT		 3301
3302 if (no_err)
3303 err_code = SCTP_ERROR_NO_ERROR;
3304 else
3305 err_code = SCTP_ERROR_REQ_REFUSED;
3306
f3830ccc
WY		 3307 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3308 sizeof(sctp_chunkhdr_t);
3309
1da177e4
LT		 3310 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3311 * the first asconf_ack parameter.
d808ad9a 3312 */
1da177e4
LT		 3313 length = sizeof(sctp_addiphdr_t);
3314 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3315 length);
3316 asconf_ack_len -= length;
3317
3318 while (asconf_ack_len > 0) {
3319 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3320 switch(asconf_ack_param->param_hdr.type) {
3321 case SCTP_PARAM_SUCCESS_REPORT:
3322 return SCTP_ERROR_NO_ERROR;
3323 case SCTP_PARAM_ERR_CAUSE:
3324 length = sizeof(sctp_addip_param_t);
ea110733 3325 err_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3326 asconf_ack_len -= length;
3327 if (asconf_ack_len > 0)
3328 return err_param->cause;
3329 else
3330 return SCTP_ERROR_INV_PARAM;
3331 break;
3332 default:
3333 return SCTP_ERROR_INV_PARAM;
3334 }
3335 }
3336
3337 length = ntohs(asconf_ack_param->param_hdr.length);
ea110733 3338 asconf_ack_param = (void *)asconf_ack_param + length;
1da177e4
LT		 3339 asconf_ack_len -= length;
3340 }
3341
3342 return err_code;
3343}
3344
3345/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3346int sctp_process_asconf_ack(struct sctp_association *asoc,
3347 struct sctp_chunk *asconf_ack)
3348{
3349 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3350 union sctp_addr_param *addr_param;
3351 sctp_addip_param_t *asconf_param;
3352 int length = 0;
3353 int asconf_len = asconf->skb->len;
3354 int all_param_pass = 0;
3355 int no_err = 1;
3356 int retval = 0;
dbc16db1 3357 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 3358
3359 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3360 * a pointer to address parameter.
d808ad9a 3361 */
1da177e4
LT		 3362 length = sizeof(sctp_addip_chunk_t);
3363 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3364 asconf_len -= length;
3365
3366 /* Skip the address parameter in the last asconf sent and store a
7aa1b54b 3367 * pointer to the first asconf parameter.
d808ad9a 3368 */
6a435732 3369 length = ntohs(addr_param->p.length);
ea110733 3370 asconf_param = (void *)addr_param + length;
1da177e4
LT		 3371 asconf_len -= length;
3372
3373 /* ADDIP 4.1
3374 * A8) If there is no response(s) to specific TLV parameter(s), and no
3375 * failures are indicated, then all request(s) are considered
3376 * successful.
3377 */
3378 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3379 all_param_pass = 1;
3380
3381 /* Process the TLVs contained in the last sent ASCONF chunk. */
3382 while (asconf_len > 0) {
3383 if (all_param_pass)
3384 err_code = SCTP_ERROR_NO_ERROR;
3385 else {
3386 err_code = sctp_get_asconf_response(asconf_ack,
3387 asconf_param,
3388 no_err);
3389 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3390 no_err = 0;
3391 }
3392
3393 switch (err_code) {
3394 case SCTP_ERROR_NO_ERROR:
425e0f68 3395 sctp_asconf_param_success(asoc, asconf_param);
1da177e4
LT		 3396 break;
3397
3398 case SCTP_ERROR_RSRC_LOW:
3399 retval = 1;
3400 break;
3401
a987f762 3402 case SCTP_ERROR_UNKNOWN_PARAM:
1da177e4
LT		 3403 /* Disable sending this type of asconf parameter in
3404 * future.
d808ad9a 3405 */
1da177e4
LT		 3406 asoc->peer.addip_disabled_mask |=
3407 asconf_param->param_hdr.type;
3408 break;
3409
3410 case SCTP_ERROR_REQ_REFUSED:
3411 case SCTP_ERROR_DEL_LAST_IP:
3412 case SCTP_ERROR_DEL_SRC_IP:
3413 default:
3414 break;
3415 }
3416
3417 /* Skip the processed asconf parameter and move to the next
3418 * one.
d808ad9a 3419 */
1da177e4 3420 length = ntohs(asconf_param->param_hdr.length);
ea110733 3421 asconf_param = (void *)asconf_param + length;
1da177e4
LT		 3422 asconf_len -= length;
3423 }
3424
ddc4bbee 3425 if (no_err && asoc->src_out_of_asoc_ok) {
8a07eb0a 3426 asoc->src_out_of_asoc_ok = 0;
ddc4bbee
MH		 3427 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3428 }
8a07eb0a 3429
1da177e4 3430 /* Free the cached last sent asconf chunk. */
5f9646c3 3431 list_del_init(&asconf->transmitted_list);
1da177e4
LT		 3432 sctp_chunk_free(asconf);
3433 asoc->addip_last_asconf = NULL;
3434
1da177e4
LT		 3435 return retval;
3436}
3437
d808ad9a 3438/* Make a FWD TSN chunk. */
1da177e4
LT		 3439struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3440 __u32 new_cum_tsn, size_t nstreams,
3441 struct sctp_fwdtsn_skip *skiplist)
3442{
3443 struct sctp_chunk *retval = NULL;
d808ad9a 3444 struct sctp_fwdtsn_hdr ftsn_hdr;
1da177e4
LT		 3445 struct sctp_fwdtsn_skip skip;
3446 size_t hint;
3447 int i;
3448
3449 hint = (nstreams + 1) * sizeof(__u32);
3450
1da177e4
LT		 3451 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3452
3453 if (!retval)
3454 return NULL;
3455
1da177e4
LT		 3456 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3457 retval->subh.fwdtsn_hdr =
3458 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3459
3460 for (i = 0; i < nstreams; i++) {
3461 skip.stream = skiplist[i].stream;
3462 skip.ssn = skiplist[i].ssn;
3463 sctp_addto_chunk(retval, sizeof(skip), &skip);
3464 }
3465
3466 return retval;
3467}
Linux 6.x block layer and io_uring tree(s)