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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * C. Robin <chris@hundredacre.ac.uk>
41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Xingang Guo <xingang.guo@intel.com>
43 * Dajiang Zhang <dajiang.zhang@nokia.com>
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Ardelle Fan <ardelle.fan@intel.com>
47 * Kevin Gao <kevin.gao@intel.com>
48 *
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
51 */
52
Joe Perches145ce502010-08-24 13:21:08 +000053#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#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>
Christian Borntraegerebc3bbc2007-10-23 12:46:32 +020061#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/crypto.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090063#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070071SCTP_STATIC
72struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
73 __u8 type, __u8 flags, int paylen);
74static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
75 const struct sctp_association *asoc,
76 const struct sctp_chunk *init_chunk,
77 int *cookie_len,
78 const __u8 *raw_addrs, int addrs_len);
79static int sctp_process_param(struct sctp_association *asoc,
80 union sctp_params param,
81 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +010082 gfp_t gfp);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -050083static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
84 const void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86/* What was the inbound interface for this chunk? */
87int sctp_chunk_iif(const struct sctp_chunk *chunk)
88{
89 struct sctp_af *af;
90 int iif = 0;
91
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070092 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (af)
94 iif = af->skb_iif(chunk->skb);
95
96 return iif;
97}
98
99/* RFC 2960 3.3.2 Initiation (INIT) (1)
100 *
101 * Note 2: The ECN capable field is reserved for future use of
102 * Explicit Congestion Notification.
103 */
104static const struct sctp_paramhdr ecap_param = {
105 SCTP_PARAM_ECN_CAPABLE,
Harvey Harrison09640e62009-02-01 00:45:17 -0800106 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108static const struct sctp_paramhdr prsctp_param = {
109 SCTP_PARAM_FWD_TSN_SUPPORT,
Harvey Harrison09640e62009-02-01 00:45:17 -0800110 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111};
112
Neil Horman5fa782c2010-04-28 10:30:59 +0000113/* A helper to initialize an op error inside a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 * provided chunk, as most cause codes will be embedded inside an
115 * abort chunk.
116 */
Al Viro5bf2db02006-11-20 16:59:45 -0800117void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800118 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
120 sctp_errhdr_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 __u16 len;
122
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900123 /* Cause code constants are now defined in network order. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 err.cause = cause_code;
125 len = sizeof(sctp_errhdr_t) + paylen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 err.length = htons(len);
Vlad Yasevich4a1c0102007-01-09 14:35:51 -0800127 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
Neil Horman5fa782c2010-04-28 10:30:59 +0000130/* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
132 * abort chunk. Differs from sctp_init_cause in that it won't oops
133 * if there isn't enough space in the op error chunk
134 */
135int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
136 size_t paylen)
137{
138 sctp_errhdr_t err;
139 __u16 len;
140
141 /* Cause code constants are now defined in network order. */
142 err.cause = cause_code;
143 len = sizeof(sctp_errhdr_t) + paylen;
144 err.length = htons(len);
145
Wei Yongjun2e3219b2010-05-17 22:51:58 -0700146 if (skb_tailroom(chunk->skb) < len)
Neil Horman5fa782c2010-04-28 10:30:59 +0000147 return -ENOSPC;
148 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
149 sizeof(sctp_errhdr_t),
150 &err);
151 return 0;
152}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/* 3.3.2 Initiation (INIT) (1)
154 *
155 * This chunk is used to initiate a SCTP association between two
156 * endpoints. The format of the INIT chunk is shown below:
157 *
158 * 0 1 2 3
159 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | Type = 1 | Chunk Flags | Chunk Length |
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
163 * | Initiate Tag |
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 * | Advertised Receiver Window Credit (a_rwnd) |
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Number of Outbound Streams | Number of Inbound Streams |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 * | Initial TSN |
170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
171 * \ \
172 * / Optional/Variable-Length Parameters /
173 * \ \
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
175 *
176 *
177 * The INIT chunk contains the following parameters. Unless otherwise
178 * noted, each parameter MUST only be included once in the INIT chunk.
179 *
180 * Fixed Parameters Status
181 * ----------------------------------------------
182 * Initiate Tag Mandatory
183 * Advertised Receiver Window Credit Mandatory
184 * Number of Outbound Streams Mandatory
185 * Number of Inbound Streams Mandatory
186 * Initial TSN Mandatory
187 *
188 * Variable Parameters Status Type Value
189 * -------------------------------------------------------------
190 * IPv4 Address (Note 1) Optional 5
191 * IPv6 Address (Note 1) Optional 6
192 * Cookie Preservative Optional 9
193 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
194 * Host Name Address (Note 3) Optional 11
195 * Supported Address Types (Note 4) Optional 12
196 */
197struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
198 const struct sctp_bind_addr *bp,
Al Virodd0fc662005-10-07 07:46:04 +0100199 gfp_t gfp, int vparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
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;
Al Viro3dbe8652006-11-20 17:25:49 -0800208 __be16 types[2];
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800209 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700210 sctp_supported_ext_param_t ext_param;
211 int num_ext = 0;
212 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700213 sctp_paramhdr_t *auth_chunks = NULL,
214 *auth_hmacs = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
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
Wei Yongjuna8170c32010-04-28 08:47:21 +0000236 chunksize = sizeof(init) + addrs_len;
237 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 chunksize += sizeof(ecap_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500239
Vlad Yasevich036b5792008-01-07 00:28:16 -0800240 if (sctp_prsctp_enable)
241 chunksize += sizeof(prsctp_param);
242
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700243 /* 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.
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700247 */
248 if (sctp_addip_enable) {
249 extensions[num_ext] = SCTP_CID_ASCONF;
250 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
251 num_ext += 2;
252 }
253
malc6fc791e2009-03-12 09:49:20 +0000254 if (sp->adaptation_ind)
255 chunksize += sizeof(aiparam);
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 chunksize += vparam_len;
258
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700259 /* Account for AUTH related parameters */
260 if (sctp_auth_enable) {
261 /* Add random parameter length*/
262 chunksize += sizeof(asoc->c.auth_random);
263
264 /* Add HMACS parameter length if any were defined */
265 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
266 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000267 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700268 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)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000274 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700275 else
Vlad Yasevich9baffaa2007-11-29 08:44:34 -0500276 auth_chunks = NULL;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700277
278 extensions[num_ext] = SCTP_CID_AUTH;
279 num_ext += 1;
280 }
281
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700282 /* If we have any extensions to report, account for that */
283 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000284 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
285 num_ext);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 /* 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);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700321
Joe Perches7aa1b542007-12-20 14:03:52 -0800322 /* Add the supported extensions parameter. Be nice and add this
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700323 * 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);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500331 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700332 }
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (sctp_prsctp_enable)
335 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700336
malc6fc791e2009-03-12 09:49:20 +0000337 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 }
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700343
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700344 /* Add SCTP-AUTH chunks to the parameter list */
345 if (sctp_auth_enable) {
346 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
347 asoc->c.auth_random);
348 if (auth_hmacs)
349 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
350 auth_hmacs);
351 if (auth_chunks)
352 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
353 auth_chunks);
354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355nodata:
Jesper Juhla51482b2005-11-08 09:41:34 -0800356 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return retval;
358}
359
360struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
361 const struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100362 gfp_t gfp, int unkparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 sctp_inithdr_t initack;
365 struct sctp_chunk *retval;
366 union sctp_params addrs;
malc6fc791e2009-03-12 09:49:20 +0000367 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 int addrs_len;
369 sctp_cookie_param_t *cookie;
370 int cookie_len;
371 size_t chunksize;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800372 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700373 sctp_supported_ext_param_t ext_param;
374 int num_ext = 0;
375 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700376 sctp_paramhdr_t *auth_chunks = NULL,
377 *auth_hmacs = NULL,
378 *auth_random = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
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 */
malc6fc791e2009-03-12 09:49:20 +0000402 sp = sctp_sk(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
404
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900405 /* Tell peer that we'll do ECN only if peer advertised such cap. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (asoc->peer.ecn_capable)
407 chunksize += sizeof(ecap_param);
408
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000409 if (asoc->peer.prsctp_capable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800410 chunksize += sizeof(prsctp_param);
411
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000412 if (asoc->peer.asconf_capable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700413 extensions[num_ext] = SCTP_CID_ASCONF;
414 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
415 num_ext += 2;
416 }
417
malc6fc791e2009-03-12 09:49:20 +0000418 if (sp->adaptation_ind)
419 chunksize += sizeof(aiparam);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700421 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)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000427 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700428 else
429 auth_hmacs = NULL;
430
431 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
432 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000433 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700434 else
435 auth_chunks = NULL;
436
437 extensions[num_ext] = SCTP_CID_AUTH;
438 num_ext += 1;
439 }
440
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500441 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000442 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
443 num_ext);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 /* 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
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400450 /* 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.]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 */
459 retval->transport = chunk->transport;
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 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);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700467 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);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500473 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700474 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (asoc->peer.prsctp_capable)
476 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
477
malc6fc791e2009-03-12 09:49:20 +0000478 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700485 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 /* We need to remove the const qualifier at this point. */
497 retval->asoc = (struct sctp_association *) asoc;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499nomem_chunk:
500 kfree(cookie);
501nomem_cookie:
Jesper Juhla51482b2005-11-08 09:41:34 -0800502 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 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. */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700708 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 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;
737 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
Vlad Yasevich02015182008-10-08 14:19:01 -0700738 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Vlad Yasevich02015182008-10-08 14:19:01 -0700740 memset(gabs, 0, sizeof(gabs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 ctsn = sctp_tsnmap_get_ctsn(map);
742 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
743
744 /* How much room is needed in the chunk? */
Vlad Yasevich02015182008-10-08 14:19:01 -0700745 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 num_dup_tsns = sctp_tsnmap_num_dups(map);
747
748 /* Initialize the SACK header. */
749 sack.cum_tsn_ack = htonl(ctsn);
750 sack.a_rwnd = htonl(asoc->a_rwnd);
751 sack.num_gap_ack_blocks = htons(num_gabs);
752 sack.num_dup_tsns = htons(num_dup_tsns);
753
754 len = sizeof(sack)
755 + sizeof(struct sctp_gap_ack_block) * num_gabs
756 + sizeof(__u32) * num_dup_tsns;
757
758 /* Create the chunk. */
759 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
760 if (!retval)
761 goto nodata;
762
763 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
764 *
765 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
766 * HEARTBEAT ACK, etc.) to the same destination transport
767 * address from which it received the DATA or control chunk to
768 * which it is replying. This rule should also be followed if
769 * the endpoint is bundling DATA chunks together with the
770 * reply chunk.
771 *
772 * However, when acknowledging multiple DATA chunks received
773 * in packets from different source addresses in a single
774 * SACK, the SACK chunk may be transmitted to one of the
775 * destination transport addresses from which the DATA or
776 * control chunks being acknowledged were received.
777 *
778 * [BUG: We do not implement the following paragraph.
779 * Perhaps we should remember the last transport we used for a
780 * SACK and avoid that (if possible) if we have seen any
781 * duplicates. --piggy]
782 *
783 * When a receiver of a duplicate DATA chunk sends a SACK to a
784 * multi- homed endpoint it MAY be beneficial to vary the
785 * destination address and not use the source address of the
786 * DATA chunk. The reason being that receiving a duplicate
787 * from a multi-homed endpoint might indicate that the return
788 * path (as specified in the source address of the DATA chunk)
789 * for the SACK is broken.
790 *
791 * [Send to the address from which we last received a DATA chunk.]
792 */
793 retval->transport = asoc->peer.last_data_from;
794
795 retval->subh.sack_hdr =
796 sctp_addto_chunk(retval, sizeof(sack), &sack);
797
798 /* Add the gap ack block information. */
799 if (num_gabs)
800 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
Vlad Yasevich02015182008-10-08 14:19:01 -0700801 gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
803 /* Add the duplicate TSN information. */
804 if (num_dup_tsns)
805 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
806 sctp_tsnmap_get_dups(map));
807
808nodata:
809 return retval;
810}
811
812/* Make a SHUTDOWN chunk. */
813struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
814 const struct sctp_chunk *chunk)
815{
816 struct sctp_chunk *retval;
817 sctp_shutdownhdr_t shut;
818 __u32 ctsn;
819
820 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
821 shut.cum_tsn_ack = htonl(ctsn);
822
823 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
824 sizeof(sctp_shutdownhdr_t));
825 if (!retval)
826 goto nodata;
827
828 retval->subh.shutdown_hdr =
829 sctp_addto_chunk(retval, sizeof(shut), &shut);
830
831 if (chunk)
832 retval->transport = chunk->transport;
833nodata:
834 return retval;
835}
836
837struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
838 const struct sctp_chunk *chunk)
839{
840 struct sctp_chunk *retval;
841
842 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
843
844 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
845 *
846 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
847 * HEARTBEAT ACK, * etc.) to the same destination transport
848 * address from which it * received the DATA or control chunk
849 * to which it is replying.
850 *
851 * [ACK back to where the SHUTDOWN came from.]
852 */
853 if (retval && chunk)
854 retval->transport = chunk->transport;
855
856 return retval;
857}
858
859struct sctp_chunk *sctp_make_shutdown_complete(
860 const struct sctp_association *asoc,
861 const struct sctp_chunk *chunk)
862{
863 struct sctp_chunk *retval;
864 __u8 flags = 0;
865
Jerome Forissier047a2422005-04-28 11:58:43 -0700866 /* Set the T-bit if we have no association (vtag will be
867 * reflected)
868 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
870
871 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
872
873 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
874 *
875 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
876 * HEARTBEAT ACK, * etc.) to the same destination transport
877 * address from which it * received the DATA or control chunk
878 * to which it is replying.
879 *
880 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
881 * came from.]
882 */
883 if (retval && chunk)
884 retval->transport = chunk->transport;
885
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900886 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889/* Create an ABORT. Note that we set the T bit if we have no
Jerome Forissier047a2422005-04-28 11:58:43 -0700890 * association, except when responding to an INIT (sctpimpguide 2.41).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 */
892struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
893 const struct sctp_chunk *chunk,
894 const size_t hint)
895{
896 struct sctp_chunk *retval;
897 __u8 flags = 0;
898
Jerome Forissier047a2422005-04-28 11:58:43 -0700899 /* Set the T-bit if we have no association and 'chunk' is not
900 * an INIT (vtag will be reflected).
901 */
902 if (!asoc) {
903 if (chunk && chunk->chunk_hdr &&
904 chunk->chunk_hdr->type == SCTP_CID_INIT)
905 flags = 0;
906 else
907 flags = SCTP_CHUNK_FLAG_T;
908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
910 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
911
912 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
913 *
914 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
915 * HEARTBEAT ACK, * etc.) to the same destination transport
916 * address from which it * received the DATA or control chunk
917 * to which it is replying.
918 *
919 * [ABORT back to where the offender came from.]
920 */
921 if (retval && chunk)
922 retval->transport = chunk->transport;
923
924 return retval;
925}
926
927/* Helper to create ABORT with a NO_USER_DATA error. */
928struct sctp_chunk *sctp_make_abort_no_data(
929 const struct sctp_association *asoc,
930 const struct sctp_chunk *chunk, __u32 tsn)
931{
932 struct sctp_chunk *retval;
Al Viro9f81bcd2006-11-20 17:26:34 -0800933 __be32 payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
936 + sizeof(tsn));
937
938 if (!retval)
939 goto no_mem;
940
941 /* Put the tsn back into network byte order. */
942 payload = htonl(tsn);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800943 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
944 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
947 *
948 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
949 * HEARTBEAT ACK, * etc.) to the same destination transport
950 * address from which it * received the DATA or control chunk
951 * to which it is replying.
952 *
953 * [ABORT back to where the offender came from.]
954 */
955 if (chunk)
956 retval->transport = chunk->transport;
957
958no_mem:
959 return retval;
960}
961
962/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
963struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
Sridhar Samudralac164a9b2006-08-22 11:50:39 -0700964 const struct msghdr *msg,
965 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966{
967 struct sctp_chunk *retval;
Sridhar Samudralac164a9b2006-08-22 11:50:39 -0700968 void *payload = NULL;
969 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Sridhar Samudralac164a9b2006-08-22 11:50:39 -0700971 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (!retval)
973 goto err_chunk;
974
975 if (paylen) {
976 /* Put the msg_iov together into payload. */
Sridhar Samudralac164a9b2006-08-22 11:50:39 -0700977 payload = kmalloc(paylen, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 if (!payload)
979 goto err_payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Sridhar Samudralac164a9b2006-08-22 11:50:39 -0700981 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
982 if (err < 0)
983 goto err_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
985
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800986 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
987 sctp_addto_chunk(retval, paylen, payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989 if (paylen)
990 kfree(payload);
991
992 return retval;
993
994err_copy:
995 kfree(payload);
996err_payload:
997 sctp_chunk_free(retval);
998 retval = NULL;
999err_chunk:
1000 return retval;
1001}
1002
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001003/* Append bytes to the end of a parameter. Will panic if chunk is not big
1004 * enough.
1005 */
1006static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1007 const void *data)
1008{
1009 void *target;
1010 int chunklen = ntohs(chunk->chunk_hdr->length);
1011
1012 target = skb_put(chunk->skb, len);
1013
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001014 if (data)
1015 memcpy(target, data, len);
1016 else
1017 memset(target, 0, len);
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001018
1019 /* Adjust the chunk length field. */
1020 chunk->chunk_hdr->length = htons(chunklen + len);
1021 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1022
1023 return target;
1024}
1025
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001026/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027struct sctp_chunk *sctp_make_abort_violation(
1028 const struct sctp_association *asoc,
1029 const struct sctp_chunk *chunk,
1030 const __u8 *payload,
1031 const size_t paylen)
1032{
1033 struct sctp_chunk *retval;
1034 struct sctp_paramhdr phdr;
1035
1036 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001037 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (!retval)
1039 goto end;
1040
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001041 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1042 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
1044 phdr.type = htons(chunk->chunk_hdr->type);
1045 phdr.length = chunk->chunk_hdr->length;
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001046 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
1049end:
1050 return retval;
1051}
1052
Wei Yongjunba016672008-09-30 05:32:24 -07001053struct sctp_chunk *sctp_make_violation_paramlen(
1054 const struct sctp_association *asoc,
1055 const struct sctp_chunk *chunk,
1056 struct sctp_paramhdr *param)
1057{
1058 struct sctp_chunk *retval;
1059 static const char error[] = "The following parameter had invalid length:";
1060 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1061 sizeof(sctp_paramhdr_t);
1062
1063 retval = sctp_make_abort(asoc, chunk, payload_len);
1064 if (!retval)
1065 goto nodata;
1066
1067 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1068 sizeof(error) + sizeof(sctp_paramhdr_t));
1069 sctp_addto_chunk(retval, sizeof(error), error);
1070 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1071
1072nodata:
1073 return retval;
1074}
1075
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076/* Make a HEARTBEAT chunk. */
1077struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
Wei Yongjun92c73af2011-04-19 21:31:47 +00001078 const struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079{
Wei Yongjun92c73af2011-04-19 21:31:47 +00001080 struct sctp_chunk *retval;
1081 sctp_sender_hb_info_t hbinfo;
1082
1083 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084
1085 if (!retval)
1086 goto nodata;
1087
Wei Yongjun92c73af2011-04-19 21:31:47 +00001088 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1089 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1090 hbinfo.daddr = transport->ipaddr;
1091 hbinfo.sent_at = jiffies;
1092 hbinfo.hb_nonce = transport->hb_nonce;
1093
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 /* Cast away the 'const', as this is just telling the chunk
1095 * what transport it belongs to.
1096 */
1097 retval->transport = (struct sctp_transport *) transport;
Wei Yongjun92c73af2011-04-19 21:31:47 +00001098 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1099 &hbinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101nodata:
1102 return retval;
1103}
1104
1105struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1106 const struct sctp_chunk *chunk,
1107 const void *payload, const size_t paylen)
1108{
1109 struct sctp_chunk *retval;
1110
1111 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1112 if (!retval)
1113 goto nodata;
1114
1115 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1116
1117 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1118 *
1119 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1120 * HEARTBEAT ACK, * etc.) to the same destination transport
1121 * address from which it * received the DATA or control chunk
1122 * to which it is replying.
1123 *
1124 * [HBACK back to where the HEARTBEAT came from.]
1125 */
1126 if (chunk)
1127 retval->transport = chunk->transport;
1128
1129nodata:
1130 return retval;
1131}
1132
1133/* Create an Operation Error chunk with the specified space reserved.
1134 * This routine can be used for containing multiple causes in the chunk.
1135 */
1136static struct sctp_chunk *sctp_make_op_error_space(
1137 const struct sctp_association *asoc,
1138 const struct sctp_chunk *chunk,
1139 size_t size)
1140{
1141 struct sctp_chunk *retval;
1142
1143 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1144 sizeof(sctp_errhdr_t) + size);
1145 if (!retval)
1146 goto nodata;
1147
1148 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1149 *
1150 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1151 * HEARTBEAT ACK, etc.) to the same destination transport
1152 * address from which it received the DATA or control chunk
1153 * to which it is replying.
1154 *
1155 */
1156 if (chunk)
1157 retval->transport = chunk->transport;
1158
1159nodata:
1160 return retval;
1161}
1162
Neil Horman5fa782c2010-04-28 10:30:59 +00001163/* Create an Operation Error chunk of a fixed size,
1164 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1165 * This is a helper function to allocate an error chunk for
1166 * for those invalid parameter codes in which we may not want
1167 * to report all the errors, if the incomming chunk is large
1168 */
1169static inline struct sctp_chunk *sctp_make_op_error_fixed(
1170 const struct sctp_association *asoc,
1171 const struct sctp_chunk *chunk)
1172{
1173 size_t size = asoc ? asoc->pathmtu : 0;
1174
1175 if (!size)
1176 size = SCTP_DEFAULT_MAXSEGMENT;
1177
1178 return sctp_make_op_error_space(asoc, chunk, size);
1179}
1180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181/* Create an Operation Error chunk. */
1182struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1183 const struct sctp_chunk *chunk,
Al Viro63706c52006-11-20 17:00:05 -08001184 __be16 cause_code, const void *payload,
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001185 size_t paylen, size_t reserve_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186{
1187 struct sctp_chunk *retval;
1188
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001189 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (!retval)
1191 goto nodata;
1192
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001193 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001194 sctp_addto_chunk(retval, paylen, payload);
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001195 if (reserve_tail)
1196 sctp_addto_param(retval, reserve_tail, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
1198nodata:
1199 return retval;
1200}
1201
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001202struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1203{
1204 struct sctp_chunk *retval;
1205 struct sctp_hmac *hmac_desc;
1206 struct sctp_authhdr auth_hdr;
1207 __u8 *hmac;
1208
1209 /* Get the first hmac that the peer told us to use */
1210 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1211 if (unlikely(!hmac_desc))
1212 return NULL;
1213
1214 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1215 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1216 if (!retval)
1217 return NULL;
1218
1219 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1220 auth_hdr.shkey_id = htons(asoc->active_key_id);
1221
1222 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1223 &auth_hdr);
1224
1225 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1226 memset(hmac, 0, hmac_desc->hmac_len);
1227
1228 /* Adjust the chunk header to include the empty MAC */
1229 retval->chunk_hdr->length =
1230 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1231 retval->chunk_end = skb_tail_pointer(retval->skb);
1232
1233 return retval;
1234}
1235
1236
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237/********************************************************************
1238 * 2nd Level Abstractions
1239 ********************************************************************/
1240
1241/* Turn an skb into a chunk.
1242 * FIXME: Eventually move the structure directly inside the skb->cb[].
1243 */
1244struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1245 const struct sctp_association *asoc,
1246 struct sock *sk)
1247{
1248 struct sctp_chunk *retval;
1249
Robert P. J. Dayc3762222007-02-10 01:45:03 -08001250 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
1252 if (!retval)
1253 goto nodata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
1255 if (!sk) {
1256 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1257 }
1258
David S. Miller79af02c2005-07-08 21:47:49 -07001259 INIT_LIST_HEAD(&retval->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 retval->skb = skb;
1261 retval->asoc = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 retval->has_tsn = 0;
1263 retval->has_ssn = 0;
1264 retval->rtt_in_progress = 0;
1265 retval->sent_at = 0;
1266 retval->singleton = 1;
1267 retval->end_of_packet = 0;
1268 retval->ecn_ce_done = 0;
1269 retval->pdiscard = 0;
1270
1271 /* sctpimpguide-05.txt Section 2.8.2
1272 * M1) Each time a new DATA chunk is transmitted
1273 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1274 * 'TSN.Missing.Report' count will be used to determine missing chunks
1275 * and when to fast retransmit.
1276 */
1277 retval->tsn_missing_report = 0;
1278 retval->tsn_gap_acked = 0;
Neil Hormanc226ef92008-07-25 12:44:09 -04001279 retval->fast_retransmit = SCTP_CAN_FRTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281 /* If this is a fragmented message, track all fragments
1282 * of the message (for SEND_FAILED).
1283 */
1284 retval->msg = NULL;
1285
1286 /* Polish the bead hole. */
1287 INIT_LIST_HEAD(&retval->transmitted_list);
1288 INIT_LIST_HEAD(&retval->frag_list);
1289 SCTP_DBG_OBJCNT_INC(chunk);
1290 atomic_set(&retval->refcnt, 1);
1291
1292nodata:
1293 return retval;
1294}
1295
1296/* Set chunk->source and dest based on the IP header in chunk->skb. */
1297void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1298 union sctp_addr *dest)
1299{
Al Virof235fca2006-11-20 17:09:01 -08001300 memcpy(&chunk->source, src, sizeof(union sctp_addr));
Al Viro16b0a032006-11-20 17:13:38 -08001301 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302}
1303
1304/* Extract the source address from a chunk. */
1305const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1306{
1307 /* If we have a known transport, use that. */
1308 if (chunk->transport) {
Al Viro6a1e5f32006-11-20 17:12:25 -08001309 return &chunk->transport->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 } else {
1311 /* Otherwise, extract it from the IP header. */
Al Viro6a1e5f32006-11-20 17:12:25 -08001312 return &chunk->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 }
1314}
1315
1316/* Create a new chunk, setting the type and flags headers from the
1317 * arguments, reserving enough space for a 'paylen' byte payload.
1318 */
1319SCTP_STATIC
1320struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1321 __u8 type, __u8 flags, int paylen)
1322{
1323 struct sctp_chunk *retval;
1324 sctp_chunkhdr_t *chunk_hdr;
1325 struct sk_buff *skb;
1326 struct sock *sk;
1327
1328 /* No need to allocate LL here, as this is only a chunk. */
1329 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1330 GFP_ATOMIC);
1331 if (!skb)
1332 goto nodata;
1333
1334 /* Make room for the chunk header. */
1335 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1336 chunk_hdr->type = type;
1337 chunk_hdr->flags = flags;
1338 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1339
1340 sk = asoc ? asoc->base.sk : NULL;
1341 retval = sctp_chunkify(skb, asoc, sk);
1342 if (!retval) {
1343 kfree_skb(skb);
1344 goto nodata;
1345 }
1346
1347 retval->chunk_hdr = chunk_hdr;
1348 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1349
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001350 /* Determine if the chunk needs to be authenticated */
1351 if (sctp_auth_send_cid(type, asoc))
1352 retval->auth = 1;
1353
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 /* Set the skb to the belonging sock for accounting. */
1355 skb->sk = sk;
1356
1357 return retval;
1358nodata:
1359 return NULL;
1360}
1361
1362
1363/* Release the memory occupied by a chunk. */
1364static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1365{
Vlad Yasevicha08de642007-12-20 14:11:47 -08001366 BUG_ON(!list_empty(&chunk->list));
1367 list_del_init(&chunk->transmitted_list);
1368
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1370 dev_kfree_skb(chunk->skb);
1371
1372 SCTP_DBG_OBJCNT_DEC(chunk);
1373 kmem_cache_free(sctp_chunk_cachep, chunk);
1374}
1375
1376/* Possibly, free the chunk. */
1377void sctp_chunk_free(struct sctp_chunk *chunk)
1378{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 /* Release our reference on the message tracker. */
1380 if (chunk->msg)
1381 sctp_datamsg_put(chunk->msg);
1382
1383 sctp_chunk_put(chunk);
1384}
1385
1386/* Grab a reference to the chunk. */
1387void sctp_chunk_hold(struct sctp_chunk *ch)
1388{
1389 atomic_inc(&ch->refcnt);
1390}
1391
1392/* Release a reference to the chunk. */
1393void sctp_chunk_put(struct sctp_chunk *ch)
1394{
1395 if (atomic_dec_and_test(&ch->refcnt))
1396 sctp_chunk_destroy(ch);
1397}
1398
1399/* Append bytes to the end of a chunk. Will panic if chunk is not big
1400 * enough.
1401 */
1402void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1403{
1404 void *target;
1405 void *padding;
1406 int chunklen = ntohs(chunk->chunk_hdr->length);
Wei Yongjun8d614ad2007-08-06 13:55:47 +08001407 int padlen = WORD_ROUND(chunklen) - chunklen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408
1409 padding = skb_put(chunk->skb, padlen);
1410 target = skb_put(chunk->skb, len);
1411
1412 memset(padding, 0, padlen);
1413 memcpy(target, data, len);
1414
1415 /* Adjust the chunk length field. */
1416 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001417 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419 return target;
1420}
1421
Neil Horman5fa782c2010-04-28 10:30:59 +00001422/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1423 * space in the chunk
1424 */
1425void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1426 int len, const void *data)
1427{
Wei Yongjun2e3219b2010-05-17 22:51:58 -07001428 if (skb_tailroom(chunk->skb) >= len)
Neil Horman5fa782c2010-04-28 10:30:59 +00001429 return sctp_addto_chunk(chunk, len, data);
1430 else
1431 return NULL;
1432}
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434/* Append bytes from user space to the end of a chunk. Will panic if
1435 * chunk is not big enough.
1436 * Returns a kernel err value.
1437 */
1438int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1439 struct iovec *data)
1440{
1441 __u8 *target;
1442 int err = 0;
1443
1444 /* Make room in chunk for data. */
1445 target = skb_put(chunk->skb, len);
1446
1447 /* Copy data (whole iovec) into chunk */
1448 if ((err = memcpy_fromiovecend(target, data, off, len)))
1449 goto out;
1450
1451 /* Adjust the chunk length field. */
1452 chunk->chunk_hdr->length =
1453 htons(ntohs(chunk->chunk_hdr->length) + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001454 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
1456out:
1457 return err;
1458}
1459
1460/* Helper function to assign a TSN if needed. This assumes that both
1461 * the data_hdr and association have already been assigned.
1462 */
1463void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1464{
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001465 struct sctp_datamsg *msg;
1466 struct sctp_chunk *lchunk;
1467 struct sctp_stream *stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 __u16 ssn;
1469 __u16 sid;
1470
1471 if (chunk->has_ssn)
1472 return;
1473
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001474 /* All fragments will be on the same stream */
1475 sid = ntohs(chunk->subh.data_hdr->stream);
1476 stream = &chunk->asoc->ssnmap->out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001478 /* Now assign the sequence number to the entire message.
1479 * All fragments must have the same stream sequence number.
1480 */
1481 msg = chunk->msg;
1482 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1483 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1484 ssn = 0;
1485 } else {
1486 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1487 ssn = sctp_ssn_next(stream, sid);
1488 else
1489 ssn = sctp_ssn_peek(stream, sid);
1490 }
1491
1492 lchunk->subh.data_hdr->ssn = htons(ssn);
1493 lchunk->has_ssn = 1;
1494 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495}
1496
1497/* Helper function to assign a TSN if needed. This assumes that both
1498 * the data_hdr and association have already been assigned.
1499 */
1500void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1501{
1502 if (!chunk->has_tsn) {
1503 /* This is the last possible instant to
1504 * assign a TSN.
1505 */
1506 chunk->subh.data_hdr->tsn =
1507 htonl(sctp_association_get_next_tsn(chunk->asoc));
1508 chunk->has_tsn = 1;
1509 }
1510}
1511
1512/* Create a CLOSED association to use with an incoming packet. */
1513struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
Alexey Dobriyan3182cd842005-07-11 20:57:47 -07001514 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +01001515 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516{
1517 struct sctp_association *asoc;
1518 struct sk_buff *skb;
1519 sctp_scope_t scope;
1520 struct sctp_af *af;
1521
1522 /* Create the bare association. */
1523 scope = sctp_scope(sctp_source(chunk));
1524 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1525 if (!asoc)
1526 goto nodata;
1527 asoc->temp = 1;
1528 skb = chunk->skb;
1529 /* Create an entry for the source address of the packet. */
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001530 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 if (unlikely(!af))
1532 goto fail;
Al Virod55c41b2006-11-20 17:09:40 -08001533 af->from_skb(&asoc->c.peer_addr, skb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534nodata:
1535 return asoc;
1536
1537fail:
1538 sctp_association_free(asoc);
1539 return NULL;
1540}
1541
1542/* Build a cookie representing asoc.
1543 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1544 */
1545static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1546 const struct sctp_association *asoc,
1547 const struct sctp_chunk *init_chunk,
1548 int *cookie_len,
1549 const __u8 *raw_addrs, int addrs_len)
1550{
1551 sctp_cookie_param_t *retval;
1552 struct sctp_signed_cookie *cookie;
1553 struct scatterlist sg;
1554 int headersize, bodysize;
1555 unsigned int keylen;
1556 char *key;
1557
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001558 /* Header size is static data prior to the actual cookie, including
1559 * any padding.
1560 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001561 headersize = sizeof(sctp_paramhdr_t) +
1562 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001563 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 bodysize = sizeof(struct sctp_cookie)
1565 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1566
1567 /* Pad out the cookie to a multiple to make the signature
1568 * functions simpler to write.
1569 */
1570 if (bodysize % SCTP_COOKIE_MULTIPLE)
1571 bodysize += SCTP_COOKIE_MULTIPLE
1572 - (bodysize % SCTP_COOKIE_MULTIPLE);
1573 *cookie_len = headersize + bodysize;
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 /* Clear this memory since we are sending this data structure
1576 * out on the network.
1577 */
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02001578 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1579 if (!retval)
1580 goto nodata;
1581
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 cookie = (struct sctp_signed_cookie *) retval->body;
1583
1584 /* Set up the parameter header. */
1585 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1586 retval->p.length = htons(*cookie_len);
1587
1588 /* Copy the cookie part of the association itself. */
1589 cookie->c = asoc->c;
1590 /* Save the raw address list length in the cookie. */
1591 cookie->c.raw_addr_list_len = addrs_len;
1592
1593 /* Remember PR-SCTP capability. */
1594 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1595
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001596 /* Save adaptation indication in the cookie. */
1597 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
1599 /* Set an expiration time for the cookie. */
1600 do_gettimeofday(&cookie->c.expiration);
1601 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1602
1603 /* Copy the peer's init packet. */
1604 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1605 ntohs(init_chunk->chunk_hdr->length));
1606
1607 /* Copy the raw local address list of the association. */
1608 memcpy((__u8 *)&cookie->c.peer_init[0] +
1609 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1610
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001611 if (sctp_sk(ep->base.sk)->hmac) {
Herbert Xu1b489e12006-08-20 15:07:14 +10001612 struct hash_desc desc;
1613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 /* Sign the message. */
Herbert Xu68e3f5d2007-10-27 00:52:07 -07001615 sg_init_one(&sg, &cookie->c, bodysize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 keylen = SCTP_SECRET_SIZE;
1617 key = (char *)ep->secret_key[ep->current_key];
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001618 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1619 desc.flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620
Herbert Xu1b489e12006-08-20 15:07:14 +10001621 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1622 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1623 goto free_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 }
1625
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 return retval;
Herbert Xu1b489e12006-08-20 15:07:14 +10001627
1628free_cookie:
1629 kfree(retval);
1630nodata:
1631 *cookie_len = 0;
1632 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633}
1634
1635/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1636struct sctp_association *sctp_unpack_cookie(
1637 const struct sctp_endpoint *ep,
1638 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +01001639 struct sctp_chunk *chunk, gfp_t gfp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 int *error, struct sctp_chunk **errp)
1641{
1642 struct sctp_association *retval = NULL;
1643 struct sctp_signed_cookie *cookie;
1644 struct sctp_cookie *bear_cookie;
1645 int headersize, bodysize, fixed_size;
Vlad Yasevich313e7b42006-01-17 11:55:57 -08001646 __u8 *digest = ep->digest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 struct scatterlist sg;
1648 unsigned int keylen, len;
1649 char *key;
1650 sctp_scope_t scope;
1651 struct sk_buff *skb = chunk->skb;
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001652 struct timeval tv;
Herbert Xu1b489e12006-08-20 15:07:14 +10001653 struct hash_desc desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001655 /* Header size is static data prior to the actual cookie, including
1656 * any padding.
1657 */
1658 headersize = sizeof(sctp_chunkhdr_t) +
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001659 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001660 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1662 fixed_size = headersize + sizeof(struct sctp_cookie);
1663
1664 /* Verify that the chunk looks like it even has a cookie.
1665 * There must be enough room for our cookie and our peer's
1666 * INIT chunk.
1667 */
1668 len = ntohs(chunk->chunk_hdr->length);
1669 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1670 goto malformed;
1671
1672 /* Verify that the cookie has been padded out. */
1673 if (bodysize % SCTP_COOKIE_MULTIPLE)
1674 goto malformed;
1675
1676 /* Process the cookie. */
1677 cookie = chunk->subh.cookie_hdr;
1678 bear_cookie = &cookie->c;
1679
1680 if (!sctp_sk(ep->base.sk)->hmac)
1681 goto no_hmac;
1682
1683 /* Check the signature. */
1684 keylen = SCTP_SECRET_SIZE;
Herbert Xu68e3f5d2007-10-27 00:52:07 -07001685 sg_init_one(&sg, bear_cookie, bodysize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 key = (char *)ep->secret_key[ep->current_key];
Herbert Xu1b489e12006-08-20 15:07:14 +10001687 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1688 desc.flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
Al Viro8ca84482006-06-20 03:26:14 -07001690 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
Herbert Xu1b489e12006-08-20 15:07:14 +10001691 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1692 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1693 *error = -SCTP_IERROR_NOMEM;
1694 goto fail;
1695 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
1697 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1698 /* Try the previous key. */
1699 key = (char *)ep->secret_key[ep->last_key];
Al Viro8ca84482006-06-20 03:26:14 -07001700 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
Herbert Xu1b489e12006-08-20 15:07:14 +10001701 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1702 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1703 *error = -SCTP_IERROR_NOMEM;
1704 goto fail;
1705 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
1707 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1708 /* Yikes! Still bad signature! */
1709 *error = -SCTP_IERROR_BAD_SIG;
1710 goto fail;
1711 }
1712 }
1713
1714no_hmac:
1715 /* IG Section 2.35.2:
1716 * 3) Compare the port numbers and the verification tag contained
1717 * within the COOKIE ECHO chunk to the actual port numbers and the
1718 * verification tag within the SCTP common header of the received
1719 * packet. If these values do not match the packet MUST be silently
1720 * discarded,
1721 */
1722 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1723 *error = -SCTP_IERROR_BAD_TAG;
1724 goto fail;
1725 }
1726
Al Viro9b1dfad2006-11-20 17:09:17 -08001727 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1729 *error = -SCTP_IERROR_BAD_PORTS;
1730 goto fail;
1731 }
1732
1733 /* Check to see if the cookie is stale. If there is already
1734 * an association, there is no need to check cookie's expiration
1735 * for init collision case of lost COOKIE ACK.
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001736 * If skb has been timestamped, then use the stamp, otherwise
1737 * use current time. This introduces a small possibility that
1738 * that a cookie may be considered expired, but his would only slow
1739 * down the new association establishment instead of every packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 */
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001741 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1742 skb_get_timestamp(skb, &tv);
1743 else
1744 do_gettimeofday(&tv);
1745
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001746 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 /*
1748 * Section 3.3.10.3 Stale Cookie Error (3)
1749 *
1750 * Cause of error
1751 * ---------------
1752 * Stale Cookie Error: Indicates the receipt of a valid State
1753 * Cookie that has expired.
1754 */
1755 len = ntohs(chunk->chunk_hdr->length);
1756 *errp = sctp_make_op_error_space(asoc, chunk, len);
1757 if (*errp) {
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001758 suseconds_t usecs = (tv.tv_sec -
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 bear_cookie->expiration.tv_sec) * 1000000L +
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001760 tv.tv_usec - bear_cookie->expiration.tv_usec;
Al Viro34bcca22006-11-20 17:27:15 -08001761 __be32 n = htonl(usecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001764 sizeof(n));
1765 sctp_addto_chunk(*errp, sizeof(n), &n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 *error = -SCTP_IERROR_STALE_COOKIE;
1767 } else
1768 *error = -SCTP_IERROR_NOMEM;
1769
1770 goto fail;
1771 }
1772
1773 /* Make a new base association. */
1774 scope = sctp_scope(sctp_source(chunk));
1775 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1776 if (!retval) {
1777 *error = -SCTP_IERROR_NOMEM;
1778 goto fail;
1779 }
1780
1781 /* Set up our peer's port number. */
1782 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1783
1784 /* Populate the association from the cookie. */
1785 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1786
1787 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1788 GFP_ATOMIC) < 0) {
1789 *error = -SCTP_IERROR_NOMEM;
1790 goto fail;
1791 }
1792
1793 /* Also, add the destination address. */
1794 if (list_empty(&retval->base.bind_addr.address_list)) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08001795 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1796 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 }
1798
1799 retval->next_tsn = retval->c.initial_tsn;
1800 retval->ctsn_ack_point = retval->next_tsn - 1;
1801 retval->addip_serial = retval->c.initial_tsn;
1802 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1803 retval->peer.prsctp_capable = retval->c.prsctp_capable;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001804 retval->peer.adaptation_ind = retval->c.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
1806 /* The INIT stuff will be done by the side effects. */
1807 return retval;
1808
1809fail:
1810 if (retval)
1811 sctp_association_free(retval);
1812
1813 return NULL;
1814
1815malformed:
1816 /* Yikes! The packet is either corrupt or deliberately
1817 * malformed.
1818 */
1819 *error = -SCTP_IERROR_MALFORMED;
1820 goto fail;
1821}
1822
1823/********************************************************************
1824 * 3rd Level Abstractions
1825 ********************************************************************/
1826
1827struct __sctp_missing {
Al Viro9f81bcd2006-11-20 17:26:34 -08001828 __be32 num_missing;
1829 __be16 type;
Eric Dumazetbc105022010-06-03 03:21:52 -07001830} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831
1832/*
1833 * Report a missing mandatory parameter.
1834 */
1835static int sctp_process_missing_param(const struct sctp_association *asoc,
1836 sctp_param_t paramtype,
1837 struct sctp_chunk *chunk,
1838 struct sctp_chunk **errp)
1839{
1840 struct __sctp_missing report;
1841 __u16 len;
1842
1843 len = WORD_ROUND(sizeof(report));
1844
1845 /* Make an ERROR chunk, preparing enough room for
1846 * returning multiple unknown parameters.
1847 */
1848 if (!*errp)
1849 *errp = sctp_make_op_error_space(asoc, chunk, len);
1850
1851 if (*errp) {
1852 report.num_missing = htonl(1);
1853 report.type = paramtype;
Vlad Yasevichebdfcad2007-01-15 19:12:31 -08001854 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001855 sizeof(report));
1856 sctp_addto_chunk(*errp, sizeof(report), &report);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 }
1858
1859 /* Stop processing this chunk. */
1860 return 0;
1861}
1862
1863/* Report an Invalid Mandatory Parameter. */
1864static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1865 struct sctp_chunk *chunk,
1866 struct sctp_chunk **errp)
1867{
1868 /* Invalid Mandatory Parameter Error has no payload. */
1869
1870 if (!*errp)
1871 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1872
1873 if (*errp)
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001874 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875
1876 /* Stop processing this chunk. */
1877 return 0;
1878}
1879
1880static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1881 struct sctp_paramhdr *param,
1882 const struct sctp_chunk *chunk,
1883 struct sctp_chunk **errp)
1884{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001885 /* This is a fatal error. Any accumulated non-fatal errors are
1886 * not reported.
1887 */
1888 if (*errp)
1889 sctp_chunk_free(*errp);
1890
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 /* Create an error chunk and fill it in with our payload. */
Wei Yongjunba016672008-09-30 05:32:24 -07001892 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
1894 return 0;
1895}
1896
1897
1898/* Do not attempt to handle the HOST_NAME parm. However, do
1899 * send back an indicator to the peer.
1900 */
1901static int sctp_process_hn_param(const struct sctp_association *asoc,
1902 union sctp_params param,
1903 struct sctp_chunk *chunk,
1904 struct sctp_chunk **errp)
1905{
1906 __u16 len = ntohs(param.p->length);
1907
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001908 /* Processing of the HOST_NAME parameter will generate an
1909 * ABORT. If we've accumulated any non-fatal errors, they
1910 * would be unrecognized parameters and we should not include
1911 * them in the ABORT.
1912 */
1913 if (*errp)
1914 sctp_chunk_free(*errp);
1915
1916 *errp = sctp_make_op_error_space(asoc, chunk, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001918 if (*errp) {
1919 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1920 sctp_addto_chunk(*errp, len, param.v);
1921 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923 /* Stop processing this chunk. */
1924 return 0;
1925}
1926
Vlad Yasevichd6701192007-12-20 14:13:31 -08001927static int sctp_verify_ext_param(union sctp_params param)
1928{
1929 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1930 int have_auth = 0;
1931 int have_asconf = 0;
1932 int i;
1933
1934 for (i = 0; i < num_ext; i++) {
1935 switch (param.ext->chunks[i]) {
1936 case SCTP_CID_AUTH:
1937 have_auth = 1;
1938 break;
1939 case SCTP_CID_ASCONF:
1940 case SCTP_CID_ASCONF_ACK:
1941 have_asconf = 1;
1942 break;
1943 }
1944 }
1945
1946 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1947 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1948 * only if ADD-IP is turned on and we are not backward-compatible
1949 * mode.
1950 */
1951 if (sctp_addip_noauth)
1952 return 1;
1953
1954 if (sctp_addip_enable && !have_auth && have_asconf)
1955 return 0;
1956
1957 return 1;
1958}
1959
Vlad Yasevich131a47e2007-09-16 15:53:56 -07001960static void sctp_process_ext_param(struct sctp_association *asoc,
1961 union sctp_params param)
1962{
1963 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1964 int i;
1965
1966 for (i = 0; i < num_ext; i++) {
1967 switch (param.ext->chunks[i]) {
1968 case SCTP_CID_FWD_TSN:
1969 if (sctp_prsctp_enable &&
1970 !asoc->peer.prsctp_capable)
1971 asoc->peer.prsctp_capable = 1;
1972 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001973 case SCTP_CID_AUTH:
1974 /* if the peer reports AUTH, assume that he
1975 * supports AUTH.
1976 */
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07001977 if (sctp_auth_enable)
1978 asoc->peer.auth_capable = 1;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001979 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07001980 case SCTP_CID_ASCONF:
1981 case SCTP_CID_ASCONF_ACK:
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07001982 if (sctp_addip_enable)
1983 asoc->peer.asconf_capable = 1;
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07001984 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07001985 default:
1986 break;
1987 }
1988 }
1989}
1990
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991/* RFC 3.2.1 & the Implementers Guide 2.2.
1992 *
1993 * The Parameter Types are encoded such that the
1994 * highest-order two bits specify the action that must be
1995 * taken if the processing endpoint does not recognize the
1996 * Parameter Type.
1997 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001998 * 00 - Stop processing this parameter; do not process any further
1999 * parameters within this chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002001 * 01 - Stop processing this parameter, do not process any further
2002 * parameters within this chunk, and report the unrecognized
2003 * parameter in an 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 *
2005 * 10 - Skip this parameter and continue processing.
2006 *
2007 * 11 - Skip this parameter and continue processing but
2008 * report the unrecognized parameter in an
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002009 * 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 *
2011 * Return value:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002012 * SCTP_IERROR_NO_ERROR - continue with the chunk
2013 * SCTP_IERROR_ERROR - stop and report an error.
2014 * SCTP_IERROR_NOMEME - out of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002016static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2017 union sctp_params param,
2018 struct sctp_chunk *chunk,
2019 struct sctp_chunk **errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002021 int retval = SCTP_IERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
2023 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2024 case SCTP_PARAM_ACTION_DISCARD:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002025 retval = SCTP_IERROR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 break;
2027 case SCTP_PARAM_ACTION_SKIP:
2028 break;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002029 case SCTP_PARAM_ACTION_DISCARD_ERR:
2030 retval = SCTP_IERROR_ERROR;
2031 /* Fall through */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 case SCTP_PARAM_ACTION_SKIP_ERR:
2033 /* Make an ERROR chunk, preparing enough room for
2034 * returning multiple unknown parameters.
2035 */
2036 if (NULL == *errp)
Neil Horman5fa782c2010-04-28 10:30:59 +00002037 *errp = sctp_make_op_error_fixed(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038
2039 if (*errp) {
Jiri Bohac2205a6e2011-02-17 13:12:08 +00002040 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2041 WORD_ROUND(ntohs(param.p->length))))
2042 sctp_addto_chunk_fixed(*errp,
2043 WORD_ROUND(ntohs(param.p->length)),
2044 param.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 } else {
2046 /* If there is no memory for generating the ERROR
2047 * report as specified, an ABORT will be triggered
2048 * to the peer and the association won't be
2049 * established.
2050 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002051 retval = SCTP_IERROR_NOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 break;
2054 default:
2055 break;
2056 }
2057
2058 return retval;
2059}
2060
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002061/* Verify variable length parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 * Return values:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002063 * SCTP_IERROR_ABORT - trigger an ABORT
2064 * SCTP_IERROR_NOMEM - out of memory (abort)
2065 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2066 * SCTP_IERROR_NO_ERROR - continue with the chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002068static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2069 union sctp_params param,
2070 sctp_cid_t cid,
2071 struct sctp_chunk *chunk,
2072 struct sctp_chunk **err_chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073{
Wei Yongjun72da7b32008-04-12 18:39:19 -07002074 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002075 int retval = SCTP_IERROR_NO_ERROR;
Wei Yongjun72da7b32008-04-12 18:39:19 -07002076 __u16 n_elt, id = 0;
2077 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
2079 /* FIXME - This routine is not looking at each parameter per the
2080 * chunk type, i.e., unrecognized parameters should be further
2081 * identified based on the chunk id.
2082 */
2083
2084 switch (param.p->type) {
2085 case SCTP_PARAM_IPV4_ADDRESS:
2086 case SCTP_PARAM_IPV6_ADDRESS:
2087 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2088 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2089 case SCTP_PARAM_STATE_COOKIE:
2090 case SCTP_PARAM_HEARTBEAT_INFO:
2091 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2092 case SCTP_PARAM_ECN_CAPABLE:
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002093 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yasevichd6701192007-12-20 14:13:31 -08002094 break;
2095
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002096 case SCTP_PARAM_SUPPORTED_EXT:
Vlad Yasevichd6701192007-12-20 14:13:31 -08002097 if (!sctp_verify_ext_param(param))
2098 return SCTP_IERROR_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 break;
2100
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002101 case SCTP_PARAM_SET_PRIMARY:
2102 if (sctp_addip_enable)
2103 break;
2104 goto fallthrough;
2105
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 case SCTP_PARAM_HOST_NAME_ADDRESS:
2107 /* Tell the peer, we won't support this param. */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002108 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2109 retval = SCTP_IERROR_ABORT;
2110 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002111
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 case SCTP_PARAM_FWD_TSN_SUPPORT:
2113 if (sctp_prsctp_enable)
2114 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002115 goto fallthrough;
2116
2117 case SCTP_PARAM_RANDOM:
2118 if (!sctp_auth_enable)
2119 goto fallthrough;
2120
2121 /* SCTP-AUTH: Secion 6.1
2122 * If the random number is not 32 byte long the association
2123 * MUST be aborted. The ABORT chunk SHOULD contain the error
2124 * cause 'Protocol Violation'.
2125 */
2126 if (SCTP_AUTH_RANDOM_LENGTH !=
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002127 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2128 sctp_process_inv_paramlength(asoc, param.p,
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002129 chunk, err_chunk);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002130 retval = SCTP_IERROR_ABORT;
2131 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002132 break;
2133
2134 case SCTP_PARAM_CHUNKS:
2135 if (!sctp_auth_enable)
2136 goto fallthrough;
2137
2138 /* SCTP-AUTH: Section 3.2
2139 * The CHUNKS parameter MUST be included once in the INIT or
2140 * INIT-ACK chunk if the sender wants to receive authenticated
2141 * chunks. Its maximum length is 260 bytes.
2142 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002143 if (260 < ntohs(param.p->length)) {
2144 sctp_process_inv_paramlength(asoc, param.p,
2145 chunk, err_chunk);
2146 retval = SCTP_IERROR_ABORT;
2147 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002148 break;
2149
2150 case SCTP_PARAM_HMAC_ALGO:
Wei Yongjun72da7b32008-04-12 18:39:19 -07002151 if (!sctp_auth_enable)
2152 goto fallthrough;
2153
2154 hmacs = (struct sctp_hmac_algo_param *)param.p;
2155 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2156
2157 /* SCTP-AUTH: Section 6.1
2158 * The HMAC algorithm based on SHA-1 MUST be supported and
2159 * included in the HMAC-ALGO parameter.
2160 */
2161 for (i = 0; i < n_elt; i++) {
2162 id = ntohs(hmacs->hmac_ids[i]);
2163
2164 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2165 break;
2166 }
2167
2168 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2169 sctp_process_inv_paramlength(asoc, param.p, chunk,
2170 err_chunk);
2171 retval = SCTP_IERROR_ABORT;
2172 }
2173 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002174fallthrough:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 default:
2176 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2177 ntohs(param.p->type), cid);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002178 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 break;
2180 }
2181 return retval;
2182}
2183
2184/* Verify the INIT packet before we process it. */
2185int sctp_verify_init(const struct sctp_association *asoc,
2186 sctp_cid_t cid,
2187 sctp_init_chunk_t *peer_init,
2188 struct sctp_chunk *chunk,
2189 struct sctp_chunk **errp)
2190{
2191 union sctp_params param;
2192 int has_cookie = 0;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002193 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194
2195 /* Verify stream values are non-zero. */
2196 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
Vlad Yasevichd023f622007-01-15 19:15:45 -08002197 (0 == peer_init->init_hdr.num_inbound_streams) ||
2198 (0 == peer_init->init_hdr.init_tag) ||
2199 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002201 return sctp_process_inv_mandatory(asoc, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 }
2203
2204 /* Check for missing mandatory parameters. */
2205 sctp_walk_params(param, peer_init, init_hdr.params) {
2206
2207 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2208 has_cookie = 1;
2209
2210 } /* for (loop through all parameters) */
2211
2212 /* There is a possibility that a parameter length was bad and
2213 * in that case we would have stoped walking the parameters.
2214 * The current param.p would point at the bad one.
2215 * Current consensus on the mailing list is to generate a PROTOCOL
2216 * VIOLATION error. We build the ERROR chunk here and let the normal
2217 * error handling code build and send the packet.
2218 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002219 if (param.v != (void*)chunk->chunk_end)
2220 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221
2222 /* The only missing mandatory param possible today is
2223 * the state cookie for an INIT-ACK chunk.
2224 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002225 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2226 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2227 chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002229 /* Verify all the variable length parameters */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 sctp_walk_params(param, peer_init, init_hdr.params) {
2231
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002232 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2233 switch (result) {
2234 case SCTP_IERROR_ABORT:
2235 case SCTP_IERROR_NOMEM:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236 return 0;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002237 case SCTP_IERROR_ERROR:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 return 1;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002239 case SCTP_IERROR_NO_ERROR:
2240 default:
2241 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 }
2243
2244 } /* for (loop through all parameters) */
2245
2246 return 1;
2247}
2248
2249/* Unpack the parameters in an INIT packet into an association.
2250 * Returns 0 on failure, else success.
2251 * FIXME: This is an association method.
2252 */
Wei Yongjunde6becd2011-04-19 21:30:51 +00002253int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002255 sctp_init_chunk_t *peer_init, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256{
2257 union sctp_params param;
2258 struct sctp_transport *transport;
2259 struct list_head *pos, *temp;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002260 struct sctp_af *af;
2261 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 char *cookie;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002263 int src_match = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264
2265 /* We must include the address that the INIT packet came from.
2266 * This is the only address that matters for an INIT packet.
2267 * When processing a COOKIE ECHO, we retrieve the from address
2268 * of the INIT from the cookie.
2269 */
2270
2271 /* This implementation defaults to making the first transport
2272 * added as the primary transport. The source address seems to
2273 * be a a better choice than any of the embedded addresses.
2274 */
Wei Yongjunde6becd2011-04-19 21:30:51 +00002275 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2276 goto nomem;
2277
2278 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2279 src_match = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280
2281 /* Process the initialization parameters. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 sctp_walk_params(param, peer_init, init_hdr.params) {
Wei Yongjunde6becd2011-04-19 21:30:51 +00002283 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2284 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2285 af = sctp_get_af_specific(param_type2af(param.p->type));
2286 af->from_addr_param(&addr, param.addr,
2287 chunk->sctp_hdr->source, 0);
2288 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2289 src_match = 1;
2290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291
2292 if (!sctp_process_param(asoc, param, peer_addr, gfp))
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002293 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 }
2295
Wei Yongjunde6becd2011-04-19 21:30:51 +00002296 /* source address of chunk may not match any valid address */
2297 if (!src_match)
2298 goto clean_up;
2299
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002300 /* AUTH: After processing the parameters, make sure that we
2301 * have all the required info to potentially do authentications.
2302 */
2303 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2304 !asoc->peer.peer_hmacs))
2305 asoc->peer.auth_capable = 0;
2306
Vlad Yasevichd6701192007-12-20 14:13:31 -08002307 /* In a non-backward compatible mode, if the peer claims
2308 * support for ADD-IP but not AUTH, the ADD-IP spec states
2309 * that we MUST ABORT the association. Section 6. The section
2310 * also give us an option to silently ignore the packet, which
2311 * is what we'll do here.
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002312 */
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04002313 if (!sctp_addip_noauth &&
2314 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002315 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2316 SCTP_PARAM_DEL_IP |
2317 SCTP_PARAM_SET_PRIMARY);
Vlad Yasevich88799fe2007-10-24 17:24:23 -04002318 asoc->peer.asconf_capable = 0;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002319 goto clean_up;
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002320 }
2321
Frank Filz3f7a87d2005-06-20 13:14:57 -07002322 /* Walk list of transports, removing transports in the UNKNOWN state. */
2323 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2324 transport = list_entry(pos, struct sctp_transport, transports);
2325 if (transport->state == SCTP_UNKNOWN) {
2326 sctp_assoc_rm_peer(asoc, transport);
2327 }
2328 }
2329
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 /* The fixed INIT headers are always in network byte
2331 * order.
2332 */
2333 asoc->peer.i.init_tag =
2334 ntohl(peer_init->init_hdr.init_tag);
2335 asoc->peer.i.a_rwnd =
2336 ntohl(peer_init->init_hdr.a_rwnd);
2337 asoc->peer.i.num_outbound_streams =
2338 ntohs(peer_init->init_hdr.num_outbound_streams);
2339 asoc->peer.i.num_inbound_streams =
2340 ntohs(peer_init->init_hdr.num_inbound_streams);
2341 asoc->peer.i.initial_tsn =
2342 ntohl(peer_init->init_hdr.initial_tsn);
2343
2344 /* Apply the upper bounds for output streams based on peer's
2345 * number of inbound streams.
2346 */
2347 if (asoc->c.sinit_num_ostreams >
2348 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2349 asoc->c.sinit_num_ostreams =
2350 ntohs(peer_init->init_hdr.num_inbound_streams);
2351 }
2352
2353 if (asoc->c.sinit_max_instreams >
2354 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2355 asoc->c.sinit_max_instreams =
2356 ntohs(peer_init->init_hdr.num_outbound_streams);
2357 }
2358
2359 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2360 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2361
2362 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2363 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2364
2365 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2366 cookie = asoc->peer.cookie;
2367 if (cookie) {
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02002368 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369 if (!asoc->peer.cookie)
2370 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 }
2372
2373 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2374 * high (for example, implementations MAY use the size of the receiver
2375 * advertised window).
2376 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002377 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2378 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 transport->ssthresh = asoc->peer.i.a_rwnd;
2380 }
2381
2382 /* Set up the TSN tracking pieces. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07002383 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2384 asoc->peer.i.initial_tsn, gfp))
2385 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386
2387 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2388 *
2389 * The stream sequence number in all the streams shall start
2390 * from 0 when the association is established. Also, when the
2391 * stream sequence number reaches the value 65535 the next
2392 * stream sequence number shall be set to 0.
2393 */
2394
Frank Filz3f7a87d2005-06-20 13:14:57 -07002395 /* Allocate storage for the negotiated streams if it is not a temporary
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002396 * association.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002397 */
2398 if (!asoc->temp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 int error;
2400
2401 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2402 asoc->c.sinit_num_ostreams, gfp);
2403 if (!asoc->ssnmap)
2404 goto clean_up;
2405
Vlad Yasevich07d93962007-05-04 13:55:27 -07002406 error = sctp_assoc_set_id(asoc, gfp);
2407 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409 }
2410
2411 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2412 *
2413 * When an endpoint has an ASCONF signaled change to be sent to the
2414 * remote endpoint it should do the following:
2415 * ...
2416 * A2) A serial number should be assigned to the Chunk. The serial
2417 * number should be a monotonically increasing number. All serial
2418 * numbers are defined to be initialized at the start of the
2419 * association to the same value as the Initial TSN.
2420 */
2421 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2422 return 1;
2423
2424clean_up:
2425 /* Release the transport structures. */
2426 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2427 transport = list_entry(pos, struct sctp_transport, transports);
Vlad Yasevichadd52372008-09-18 16:28:27 -07002428 if (transport->state != SCTP_ACTIVE)
2429 sctp_assoc_rm_peer(asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07002431
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432nomem:
2433 return 0;
2434}
2435
2436
2437/* Update asoc with the option described in param.
2438 *
2439 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2440 *
2441 * asoc is the association to update.
2442 * param is the variable length parameter to use for update.
2443 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2444 * If the current packet is an INIT we want to minimize the amount of
2445 * work we do. In particular, we should not build transport
2446 * structures for the addresses.
2447 */
2448static int sctp_process_param(struct sctp_association *asoc,
2449 union sctp_params param,
2450 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002451 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452{
2453 union sctp_addr addr;
2454 int i;
2455 __u16 sat;
2456 int retval = 1;
2457 sctp_scope_t scope;
2458 time_t stale;
2459 struct sctp_af *af;
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002460 union sctp_addr_param *addr_param;
2461 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462
2463 /* We maintain all INIT parameters in network byte order all the
2464 * time. This allows us to not worry about whether the parameters
2465 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2466 */
2467 switch (param.p->type) {
2468 case SCTP_PARAM_IPV6_ADDRESS:
2469 if (PF_INET6 != asoc->base.sk->sk_family)
2470 break;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002471 goto do_addr_param;
2472
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473 case SCTP_PARAM_IPV4_ADDRESS:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002474 /* v4 addresses are not allowed on v6-only socket */
2475 if (ipv6_only_sock(asoc->base.sk))
2476 break;
2477do_addr_param:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478 af = sctp_get_af_specific(param_type2af(param.p->type));
Al Virodd86d132006-11-20 17:11:13 -08002479 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480 scope = sctp_scope(peer_addr);
Al Virodd86d132006-11-20 17:11:13 -08002481 if (sctp_in_scope(&addr, scope))
2482 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 return 0;
2484 break;
2485
2486 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2487 if (!sctp_cookie_preserve_enable)
2488 break;
2489
2490 stale = ntohl(param.life->lifespan_increment);
2491
2492 /* Suggested Cookie Life span increment's unit is msec,
2493 * (1/1000sec).
2494 */
2495 asoc->cookie_life.tv_sec += stale / 1000;
2496 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2497 break;
2498
2499 case SCTP_PARAM_HOST_NAME_ADDRESS:
2500 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2501 break;
2502
2503 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2504 /* Turn off the default values first so we'll know which
2505 * ones are really set by the peer.
2506 */
2507 asoc->peer.ipv4_address = 0;
2508 asoc->peer.ipv6_address = 0;
2509
Gui Jianfeng140ee962008-03-05 13:43:32 -08002510 /* Assume that peer supports the address family
2511 * by which it sends a packet.
2512 */
2513 if (peer_addr->sa.sa_family == AF_INET6)
2514 asoc->peer.ipv6_address = 1;
2515 else if (peer_addr->sa.sa_family == AF_INET)
2516 asoc->peer.ipv4_address = 1;
2517
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 /* Cycle through address types; avoid divide by 0. */
2519 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2520 if (sat)
2521 sat /= sizeof(__u16);
2522
2523 for (i = 0; i < sat; ++i) {
2524 switch (param.sat->types[i]) {
2525 case SCTP_PARAM_IPV4_ADDRESS:
2526 asoc->peer.ipv4_address = 1;
2527 break;
2528
2529 case SCTP_PARAM_IPV6_ADDRESS:
Wei Yongjun6e40a912008-05-09 15:11:17 -07002530 if (PF_INET6 == asoc->base.sk->sk_family)
2531 asoc->peer.ipv6_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002532 break;
2533
2534 case SCTP_PARAM_HOST_NAME_ADDRESS:
2535 asoc->peer.hostname_address = 1;
2536 break;
2537
2538 default: /* Just ignore anything else. */
2539 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541 }
2542 break;
2543
2544 case SCTP_PARAM_STATE_COOKIE:
2545 asoc->peer.cookie_len =
2546 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2547 asoc->peer.cookie = param.cookie->body;
2548 break;
2549
2550 case SCTP_PARAM_HEARTBEAT_INFO:
2551 /* Would be odd to receive, but it causes no problems. */
2552 break;
2553
2554 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2555 /* Rejected during verify stage. */
2556 break;
2557
2558 case SCTP_PARAM_ECN_CAPABLE:
2559 asoc->peer.ecn_capable = 1;
2560 break;
2561
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002562 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yaseviche69c4e02008-09-15 16:29:49 -04002563 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 break;
2565
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002566 case SCTP_PARAM_SET_PRIMARY:
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07002567 if (!sctp_addip_enable)
2568 goto fall_through;
2569
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002570 addr_param = param.v + sizeof(sctp_addip_param_t);
2571
2572 af = sctp_get_af_specific(param_type2af(param.p->type));
2573 af->from_addr_param(&addr, addr_param,
2574 htons(asoc->peer.port), 0);
2575
2576 /* if the address is invalid, we can't process it.
2577 * XXX: see spec for what to do.
2578 */
2579 if (!af->addr_valid(&addr, NULL, NULL))
2580 break;
2581
2582 t = sctp_assoc_lookup_paddr(asoc, &addr);
2583 if (!t)
2584 break;
2585
2586 sctp_assoc_set_primary(asoc, t);
2587 break;
2588
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002589 case SCTP_PARAM_SUPPORTED_EXT:
2590 sctp_process_ext_param(asoc, param);
2591 break;
2592
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593 case SCTP_PARAM_FWD_TSN_SUPPORT:
2594 if (sctp_prsctp_enable) {
2595 asoc->peer.prsctp_capable = 1;
2596 break;
2597 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002598 /* Fall Through */
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002599 goto fall_through;
2600
2601 case SCTP_PARAM_RANDOM:
2602 if (!sctp_auth_enable)
2603 goto fall_through;
2604
2605 /* Save peer's random parameter */
2606 asoc->peer.peer_random = kmemdup(param.p,
2607 ntohs(param.p->length), gfp);
2608 if (!asoc->peer.peer_random) {
2609 retval = 0;
2610 break;
2611 }
2612 break;
2613
2614 case SCTP_PARAM_HMAC_ALGO:
2615 if (!sctp_auth_enable)
2616 goto fall_through;
2617
2618 /* Save peer's HMAC list */
2619 asoc->peer.peer_hmacs = kmemdup(param.p,
2620 ntohs(param.p->length), gfp);
2621 if (!asoc->peer.peer_hmacs) {
2622 retval = 0;
2623 break;
2624 }
2625
2626 /* Set the default HMAC the peer requested*/
2627 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2628 break;
2629
2630 case SCTP_PARAM_CHUNKS:
2631 if (!sctp_auth_enable)
2632 goto fall_through;
2633
2634 asoc->peer.peer_chunks = kmemdup(param.p,
2635 ntohs(param.p->length), gfp);
2636 if (!asoc->peer.peer_chunks)
2637 retval = 0;
2638 break;
2639fall_through:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 default:
2641 /* Any unrecognized parameters should have been caught
2642 * and handled by sctp_verify_param() which should be
2643 * called prior to this routine. Simply log the error
2644 * here.
2645 */
2646 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2647 ntohs(param.p->type), asoc);
2648 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002649 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650
2651 return retval;
2652}
2653
2654/* Select a new verification tag. */
2655__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2656{
2657 /* I believe that this random number generator complies with RFC1750.
2658 * A tag of 0 is reserved for special cases (e.g. INIT).
2659 */
2660 __u32 x;
2661
2662 do {
2663 get_random_bytes(&x, sizeof(__u32));
2664 } while (x == 0);
2665
2666 return x;
2667}
2668
2669/* Select an initial TSN to send during startup. */
2670__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2671{
2672 __u32 retval;
2673
2674 get_random_bytes(&retval, sizeof(__u32));
2675 return retval;
2676}
2677
2678/*
2679 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2680 * 0 1 2 3
2681 * 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
2682 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2683 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2684 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2685 * | Serial Number |
2686 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2687 * | Address Parameter |
2688 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2689 * | ASCONF Parameter #1 |
2690 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2691 * \ \
2692 * / .... /
2693 * \ \
2694 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2695 * | ASCONF Parameter #N |
2696 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2697 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002698 * Address Parameter and other parameter will not be wrapped in this function
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 */
2700static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2701 union sctp_addr *addr,
2702 int vparam_len)
2703{
2704 sctp_addiphdr_t asconf;
2705 struct sctp_chunk *retval;
2706 int length = sizeof(asconf) + vparam_len;
2707 union sctp_addr_param addrparam;
2708 int addrlen;
2709 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2710
2711 addrlen = af->to_addr_param(addr, &addrparam);
2712 if (!addrlen)
2713 return NULL;
2714 length += addrlen;
2715
2716 /* Create the chunk. */
2717 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2718 if (!retval)
2719 return NULL;
2720
2721 asconf.serial = htonl(asoc->addip_serial++);
2722
2723 retval->subh.addip_hdr =
2724 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2725 retval->param_hdr.v =
2726 sctp_addto_chunk(retval, addrlen, &addrparam);
2727
2728 return retval;
2729}
2730
2731/* ADDIP
2732 * 3.2.1 Add IP Address
2733 * 0 1 2 3
2734 * 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
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2736 * | Type = 0xC001 | Length = Variable |
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | ASCONF-Request Correlation ID |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2740 * | Address Parameter |
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 *
2743 * 3.2.2 Delete IP Address
2744 * 0 1 2 3
2745 * 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
2746 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * | Type = 0xC002 | Length = Variable |
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * | ASCONF-Request Correlation ID |
2750 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2751 * | Address Parameter |
2752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 *
2754 */
2755struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2756 union sctp_addr *laddr,
2757 struct sockaddr *addrs,
2758 int addrcnt,
Al Virodbc16db2006-11-20 17:01:42 -08002759 __be16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760{
2761 sctp_addip_param_t param;
2762 struct sctp_chunk *retval;
2763 union sctp_addr_param addr_param;
2764 union sctp_addr *addr;
2765 void *addr_buf;
2766 struct sctp_af *af;
2767 int paramlen = sizeof(param);
2768 int addr_param_len = 0;
2769 int totallen = 0;
2770 int i;
2771
2772 /* Get total length of all the address parameters. */
2773 addr_buf = addrs;
2774 for (i = 0; i < addrcnt; i++) {
2775 addr = (union sctp_addr *)addr_buf;
2776 af = sctp_get_af_specific(addr->v4.sin_family);
2777 addr_param_len = af->to_addr_param(addr, &addr_param);
2778
2779 totallen += paramlen;
2780 totallen += addr_param_len;
2781
2782 addr_buf += af->sockaddr_len;
2783 }
2784
2785 /* Create an asconf chunk with the required length. */
2786 retval = sctp_make_asconf(asoc, laddr, totallen);
2787 if (!retval)
2788 return NULL;
2789
2790 /* Add the address parameters to the asconf chunk. */
2791 addr_buf = addrs;
2792 for (i = 0; i < addrcnt; i++) {
2793 addr = (union sctp_addr *)addr_buf;
2794 af = sctp_get_af_specific(addr->v4.sin_family);
2795 addr_param_len = af->to_addr_param(addr, &addr_param);
2796 param.param_hdr.type = flags;
2797 param.param_hdr.length = htons(paramlen + addr_param_len);
2798 param.crr_id = i;
2799
2800 sctp_addto_chunk(retval, paramlen, &param);
2801 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2802
2803 addr_buf += af->sockaddr_len;
2804 }
2805 return retval;
2806}
2807
2808/* ADDIP
2809 * 3.2.4 Set Primary IP Address
2810 * 0 1 2 3
2811 * 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
2812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2813 * | Type =0xC004 | Length = Variable |
2814 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2815 * | ASCONF-Request Correlation ID |
2816 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2817 * | Address Parameter |
2818 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2819 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002820 * Create an ASCONF chunk with Set Primary IP address parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 */
2822struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2823 union sctp_addr *addr)
2824{
2825 sctp_addip_param_t param;
2826 struct sctp_chunk *retval;
2827 int len = sizeof(param);
2828 union sctp_addr_param addrparam;
2829 int addrlen;
2830 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2831
2832 addrlen = af->to_addr_param(addr, &addrparam);
2833 if (!addrlen)
2834 return NULL;
2835 len += addrlen;
2836
2837 /* Create the chunk and make asconf header. */
2838 retval = sctp_make_asconf(asoc, addr, len);
2839 if (!retval)
2840 return NULL;
2841
2842 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2843 param.param_hdr.length = htons(len);
2844 param.crr_id = 0;
2845
2846 sctp_addto_chunk(retval, sizeof(param), &param);
2847 sctp_addto_chunk(retval, addrlen, &addrparam);
2848
2849 return retval;
2850}
2851
2852/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2853 * 0 1 2 3
2854 * 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
2855 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2856 * | Type = 0x80 | Chunk Flags | Chunk Length |
2857 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2858 * | Serial Number |
2859 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2860 * | ASCONF Parameter Response#1 |
2861 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2862 * \ \
2863 * / .... /
2864 * \ \
2865 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2866 * | ASCONF Parameter Response#N |
2867 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2868 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002869 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870 */
2871static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2872 __u32 serial, int vparam_len)
2873{
2874 sctp_addiphdr_t asconf;
2875 struct sctp_chunk *retval;
2876 int length = sizeof(asconf) + vparam_len;
2877
2878 /* Create the chunk. */
2879 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2880 if (!retval)
2881 return NULL;
2882
2883 asconf.serial = htonl(serial);
2884
2885 retval->subh.addip_hdr =
2886 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2887
2888 return retval;
2889}
2890
2891/* Add response parameters to an ASCONF_ACK chunk. */
Al Viro9f81bcd2006-11-20 17:26:34 -08002892static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
Al Virodbc16db2006-11-20 17:01:42 -08002893 __be16 err_code, sctp_addip_param_t *asconf_param)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894{
2895 sctp_addip_param_t ack_param;
2896 sctp_errhdr_t err_param;
2897 int asconf_param_len = 0;
2898 int err_param_len = 0;
Al Virodbc16db2006-11-20 17:01:42 -08002899 __be16 response_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900
2901 if (SCTP_ERROR_NO_ERROR == err_code) {
2902 response_type = SCTP_PARAM_SUCCESS_REPORT;
2903 } else {
2904 response_type = SCTP_PARAM_ERR_CAUSE;
2905 err_param_len = sizeof(err_param);
2906 if (asconf_param)
2907 asconf_param_len =
2908 ntohs(asconf_param->param_hdr.length);
2909 }
2910
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002911 /* Add Success Indication or Error Cause Indication parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 ack_param.param_hdr.type = response_type;
2913 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2914 err_param_len +
2915 asconf_param_len);
2916 ack_param.crr_id = crr_id;
2917 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2918
2919 if (SCTP_ERROR_NO_ERROR == err_code)
2920 return;
2921
2922 /* Add Error Cause parameter. */
2923 err_param.cause = err_code;
2924 err_param.length = htons(err_param_len + asconf_param_len);
2925 sctp_addto_chunk(chunk, err_param_len, &err_param);
2926
2927 /* Add the failed TLV copied from ASCONF chunk. */
2928 if (asconf_param)
2929 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2930}
2931
2932/* Process a asconf parameter. */
Al Virodbc16db2006-11-20 17:01:42 -08002933static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934 struct sctp_chunk *asconf,
2935 sctp_addip_param_t *asconf_param)
2936{
2937 struct sctp_transport *peer;
2938 struct sctp_af *af;
2939 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940 union sctp_addr_param *addr_param;
Al Viro5f242a12006-11-20 17:05:23 -08002941
Patrick McHardyc1cc6782008-05-13 23:25:00 -07002942 addr_param = (union sctp_addr_param *)
2943 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2944
Wei Yongjun44e65c12009-06-16 14:48:24 +08002945 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2946 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2947 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2948 return SCTP_ERROR_UNKNOWN_PARAM;
2949
Shan Wei6a435732011-04-18 19:11:47 +00002950 switch (addr_param->p.type) {
Wei Yongjunc4492582008-05-09 15:11:53 -07002951 case SCTP_PARAM_IPV6_ADDRESS:
2952 if (!asoc->peer.ipv6_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08002953 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07002954 break;
2955 case SCTP_PARAM_IPV4_ADDRESS:
2956 if (!asoc->peer.ipv4_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08002957 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07002958 break;
2959 default:
Wei Yongjun945e5ab2009-04-16 14:21:02 +08002960 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07002961 }
2962
Shan Wei6a435732011-04-18 19:11:47 +00002963 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964 if (unlikely(!af))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08002965 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966
Al Virodd86d132006-11-20 17:11:13 -08002967 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08002968
2969 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2970 * or multicast address.
2971 * (note: wildcard is permitted and requires special handling so
2972 * make sure we check for that)
2973 */
2974 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08002975 return SCTP_ERROR_DNS_FAILED;
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08002976
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 switch (asconf_param->param_hdr.type) {
2978 case SCTP_PARAM_ADD_IP:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08002979 /* Section 4.2.1:
2980 * If the address 0.0.0.0 or ::0 is provided, the source
2981 * address of the packet MUST be added.
2982 */
2983 if (af->is_any(&addr))
2984 memcpy(&addr, &asconf->source, sizeof(addr));
2985
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002987 * request and does not have the local resources to add this
2988 * new address to the association, it MUST return an Error
2989 * Cause TLV set to the new error code 'Operation Refused
2990 * Due to Resource Shortage'.
2991 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992
Al Virodd86d132006-11-20 17:11:13 -08002993 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 if (!peer)
2995 return SCTP_ERROR_RSRC_LOW;
2996
2997 /* Start the heartbeat timer. */
2998 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2999 sctp_transport_hold(peer);
3000 break;
3001 case SCTP_PARAM_DEL_IP:
3002 /* ADDIP 4.3 D7) If a request is received to delete the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003003 * last remaining IP address of a peer endpoint, the receiver
3004 * MUST send an Error Cause TLV with the error cause set to the
3005 * new error code 'Request to Delete Last Remaining IP Address'.
3006 */
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003007 if (asoc->peer.transport_count == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003008 return SCTP_ERROR_DEL_LAST_IP;
3009
3010 /* ADDIP 4.3 D8) If a request is received to delete an IP
3011 * address which is also the source address of the IP packet
3012 * which contained the ASCONF chunk, the receiver MUST reject
3013 * this request. To reject the request the receiver MUST send
3014 * an Error Cause TLV set to the new error code 'Request to
3015 * Delete Source IP Address'
3016 */
Al Viro6a1e5f32006-11-20 17:12:25 -08003017 if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 return SCTP_ERROR_DEL_SRC_IP;
3019
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003020 /* Section 4.2.2
3021 * If the address 0.0.0.0 or ::0 is provided, all
3022 * addresses of the peer except the source address of the
3023 * packet MUST be deleted.
3024 */
3025 if (af->is_any(&addr)) {
3026 sctp_assoc_set_primary(asoc, asconf->transport);
3027 sctp_assoc_del_nonprimary_peers(asoc,
3028 asconf->transport);
3029 } else
3030 sctp_assoc_del_peer(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003031 break;
3032 case SCTP_PARAM_SET_PRIMARY:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003033 /* ADDIP Section 4.2.4
3034 * If the address 0.0.0.0 or ::0 is provided, the receiver
3035 * MAY mark the source address of the packet as its
3036 * primary.
3037 */
3038 if (af->is_any(&addr))
3039 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3040
Al Virodd86d132006-11-20 17:11:13 -08003041 peer = sctp_assoc_lookup_paddr(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003042 if (!peer)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003043 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044
3045 sctp_assoc_set_primary(asoc, peer);
3046 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047 }
3048
3049 return SCTP_ERROR_NO_ERROR;
3050}
3051
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003052/* Verify the ASCONF packet before we process it. */
3053int sctp_verify_asconf(const struct sctp_association *asoc,
3054 struct sctp_paramhdr *param_hdr, void *chunk_end,
3055 struct sctp_paramhdr **errp) {
3056 sctp_addip_param_t *asconf_param;
3057 union sctp_params param;
3058 int length, plen;
3059
3060 param.v = (sctp_paramhdr_t *) param_hdr;
3061 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3062 length = ntohs(param.p->length);
3063 *errp = param.p;
3064
3065 if (param.v > chunk_end - length ||
3066 length < sizeof(sctp_paramhdr_t))
3067 return 0;
3068
3069 switch (param.p->type) {
3070 case SCTP_PARAM_ADD_IP:
3071 case SCTP_PARAM_DEL_IP:
3072 case SCTP_PARAM_SET_PRIMARY:
3073 asconf_param = (sctp_addip_param_t *)param.v;
3074 plen = ntohs(asconf_param->param_hdr.length);
3075 if (plen < sizeof(sctp_addip_param_t) +
3076 sizeof(sctp_paramhdr_t))
3077 return 0;
3078 break;
3079 case SCTP_PARAM_SUCCESS_REPORT:
3080 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3081 if (length != sizeof(sctp_addip_param_t))
3082 return 0;
3083
3084 break;
3085 default:
3086 break;
3087 }
3088
3089 param.v += WORD_ROUND(length);
3090 }
3091
3092 if (param.v != chunk_end)
3093 return 0;
3094
3095 return 1;
3096}
3097
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003098/* Process an incoming ASCONF chunk with the next expected serial no. and
Linus Torvalds1da177e2005-04-16 15:20:36 -07003099 * return an ASCONF_ACK chunk to be sent in response.
3100 */
3101struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3102 struct sctp_chunk *asconf)
3103{
3104 sctp_addiphdr_t *hdr;
3105 union sctp_addr_param *addr_param;
3106 sctp_addip_param_t *asconf_param;
3107 struct sctp_chunk *asconf_ack;
3108
Al Virodbc16db2006-11-20 17:01:42 -08003109 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110 int length = 0;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003111 int chunk_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112 __u32 serial;
3113 int all_param_pass = 1;
3114
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003115 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003116 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3117 serial = ntohl(hdr->serial);
3118
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003119 /* Skip the addiphdr and store a pointer to address parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003120 length = sizeof(sctp_addiphdr_t);
3121 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3122 chunk_len -= length;
3123
3124 /* Skip the address parameter and store a pointer to the first
Joe Perches7aa1b542007-12-20 14:03:52 -08003125 * asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003126 */
Shan Wei6a435732011-04-18 19:11:47 +00003127 length = ntohs(addr_param->p.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3129 chunk_len -= length;
3130
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003131 /* create an ASCONF_ACK chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003132 * Based on the definitions of parameters, we know that the size of
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003133 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
Joe Perches7aa1b542007-12-20 14:03:52 -08003134 * parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 */
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003136 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137 if (!asconf_ack)
3138 goto done;
3139
3140 /* Process the TLVs contained within the ASCONF chunk. */
3141 while (chunk_len > 0) {
3142 err_code = sctp_process_asconf_param(asoc, asconf,
3143 asconf_param);
3144 /* ADDIP 4.1 A7)
3145 * If an error response is received for a TLV parameter,
3146 * all TLVs with no response before the failed TLV are
3147 * considered successful if not reported. All TLVs after
3148 * the failed response are considered unsuccessful unless
3149 * a specific success indication is present for the parameter.
3150 */
3151 if (SCTP_ERROR_NO_ERROR != err_code)
3152 all_param_pass = 0;
3153
3154 if (!all_param_pass)
3155 sctp_add_asconf_response(asconf_ack,
3156 asconf_param->crr_id, err_code,
3157 asconf_param);
3158
3159 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3160 * an IP address sends an 'Out of Resource' in its response, it
3161 * MUST also fail any subsequent add or delete requests bundled
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003162 * in the ASCONF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003163 */
3164 if (SCTP_ERROR_RSRC_LOW == err_code)
3165 goto done;
3166
3167 /* Move to the next ASCONF param. */
3168 length = ntohs(asconf_param->param_hdr.length);
3169 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3170 length);
3171 chunk_len -= length;
3172 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003173
Linus Torvalds1da177e2005-04-16 15:20:36 -07003174done:
3175 asoc->peer.addip_serial++;
3176
3177 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003178 * after freeing the reference to old asconf ack if any.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003179 */
3180 if (asconf_ack) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003181 sctp_chunk_hold(asconf_ack);
Vlad Yasevicha08de642007-12-20 14:11:47 -08003182 list_add_tail(&asconf_ack->transmitted_list,
3183 &asoc->asconf_ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184 }
3185
3186 return asconf_ack;
3187}
3188
3189/* Process a asconf parameter that is successfully acked. */
Wei Yongjun425e0f62009-06-16 14:47:30 +08003190static void sctp_asconf_param_success(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003191 sctp_addip_param_t *asconf_param)
3192{
3193 struct sctp_af *af;
3194 union sctp_addr addr;
3195 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3196 union sctp_addr_param *addr_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003197 struct sctp_transport *transport;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003198 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199
3200 addr_param = (union sctp_addr_param *)
3201 ((void *)asconf_param + sizeof(sctp_addip_param_t));
3202
3203 /* We have checked the packet before, so we do not check again. */
Shan Wei6a435732011-04-18 19:11:47 +00003204 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Al Virodd86d132006-11-20 17:11:13 -08003205 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003206
3207 switch (asconf_param->param_hdr.type) {
3208 case SCTP_PARAM_ADD_IP:
Vlad Yasevich559cf712007-09-16 16:03:28 -07003209 /* This is always done in BH context with a socket lock
3210 * held, so the list can not change.
3211 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003212 local_bh_disable();
Vlad Yasevich559cf712007-09-16 16:03:28 -07003213 list_for_each_entry(saddr, &bp->address_list, list) {
Al Virodd86d132006-11-20 17:11:13 -08003214 if (sctp_cmp_addr_exact(&saddr->a, &addr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08003215 saddr->state = SCTP_ADDR_SRC;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003216 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003217 local_bh_enable();
Wei Yongjun3cd97492009-06-16 10:07:23 +08003218 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3219 transports) {
Wei Yongjun3cd97492009-06-16 10:07:23 +08003220 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003221 transport->dst = NULL;
Wei Yongjun3cd97492009-06-16 10:07:23 +08003222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003223 break;
3224 case SCTP_PARAM_DEL_IP:
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003225 local_bh_disable();
Wei Yongjun425e0f62009-06-16 14:47:30 +08003226 sctp_del_bind_addr(bp, &addr);
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003227 local_bh_enable();
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07003228 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3229 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003230 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003231 transport->dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003232 }
3233 break;
3234 default:
3235 break;
3236 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237}
3238
3239/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3240 * for the given asconf parameter. If there is no response for this parameter,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003241 * return the error code based on the third argument 'no_err'.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242 * ADDIP 4.1
3243 * A7) If an error response is received for a TLV parameter, all TLVs with no
3244 * response before the failed TLV are considered successful if not reported.
3245 * All TLVs after the failed response are considered unsuccessful unless a
3246 * specific success indication is present for the parameter.
3247 */
Al Virodbc16db2006-11-20 17:01:42 -08003248static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 sctp_addip_param_t *asconf_param,
3250 int no_err)
3251{
3252 sctp_addip_param_t *asconf_ack_param;
3253 sctp_errhdr_t *err_param;
3254 int length;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003255 int asconf_ack_len;
Al Virodbc16db2006-11-20 17:01:42 -08003256 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003257
3258 if (no_err)
3259 err_code = SCTP_ERROR_NO_ERROR;
3260 else
3261 err_code = SCTP_ERROR_REQ_REFUSED;
3262
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003263 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3264 sizeof(sctp_chunkhdr_t);
3265
Linus Torvalds1da177e2005-04-16 15:20:36 -07003266 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3267 * the first asconf_ack parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003268 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269 length = sizeof(sctp_addiphdr_t);
3270 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3271 length);
3272 asconf_ack_len -= length;
3273
3274 while (asconf_ack_len > 0) {
3275 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3276 switch(asconf_ack_param->param_hdr.type) {
3277 case SCTP_PARAM_SUCCESS_REPORT:
3278 return SCTP_ERROR_NO_ERROR;
3279 case SCTP_PARAM_ERR_CAUSE:
3280 length = sizeof(sctp_addip_param_t);
3281 err_param = (sctp_errhdr_t *)
3282 ((void *)asconf_ack_param + length);
3283 asconf_ack_len -= length;
3284 if (asconf_ack_len > 0)
3285 return err_param->cause;
3286 else
3287 return SCTP_ERROR_INV_PARAM;
3288 break;
3289 default:
3290 return SCTP_ERROR_INV_PARAM;
3291 }
3292 }
3293
3294 length = ntohs(asconf_ack_param->param_hdr.length);
3295 asconf_ack_param = (sctp_addip_param_t *)
3296 ((void *)asconf_ack_param + length);
3297 asconf_ack_len -= length;
3298 }
3299
3300 return err_code;
3301}
3302
3303/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3304int sctp_process_asconf_ack(struct sctp_association *asoc,
3305 struct sctp_chunk *asconf_ack)
3306{
3307 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3308 union sctp_addr_param *addr_param;
3309 sctp_addip_param_t *asconf_param;
3310 int length = 0;
3311 int asconf_len = asconf->skb->len;
3312 int all_param_pass = 0;
3313 int no_err = 1;
3314 int retval = 0;
Al Virodbc16db2006-11-20 17:01:42 -08003315 __be16 err_code = SCTP_ERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003316
3317 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3318 * a pointer to address parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003319 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003320 length = sizeof(sctp_addip_chunk_t);
3321 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3322 asconf_len -= length;
3323
3324 /* Skip the address parameter in the last asconf sent and store a
Joe Perches7aa1b542007-12-20 14:03:52 -08003325 * pointer to the first asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003326 */
Shan Wei6a435732011-04-18 19:11:47 +00003327 length = ntohs(addr_param->p.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003328 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3329 asconf_len -= length;
3330
3331 /* ADDIP 4.1
3332 * A8) If there is no response(s) to specific TLV parameter(s), and no
3333 * failures are indicated, then all request(s) are considered
3334 * successful.
3335 */
3336 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3337 all_param_pass = 1;
3338
3339 /* Process the TLVs contained in the last sent ASCONF chunk. */
3340 while (asconf_len > 0) {
3341 if (all_param_pass)
3342 err_code = SCTP_ERROR_NO_ERROR;
3343 else {
3344 err_code = sctp_get_asconf_response(asconf_ack,
3345 asconf_param,
3346 no_err);
3347 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3348 no_err = 0;
3349 }
3350
3351 switch (err_code) {
3352 case SCTP_ERROR_NO_ERROR:
Wei Yongjun425e0f62009-06-16 14:47:30 +08003353 sctp_asconf_param_success(asoc, asconf_param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003354 break;
3355
3356 case SCTP_ERROR_RSRC_LOW:
3357 retval = 1;
3358 break;
3359
Wei Yongjuna987f762009-04-07 15:44:29 +08003360 case SCTP_ERROR_UNKNOWN_PARAM:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003361 /* Disable sending this type of asconf parameter in
3362 * future.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003363 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003364 asoc->peer.addip_disabled_mask |=
3365 asconf_param->param_hdr.type;
3366 break;
3367
3368 case SCTP_ERROR_REQ_REFUSED:
3369 case SCTP_ERROR_DEL_LAST_IP:
3370 case SCTP_ERROR_DEL_SRC_IP:
3371 default:
3372 break;
3373 }
3374
3375 /* Skip the processed asconf parameter and move to the next
3376 * one.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003377 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003378 length = ntohs(asconf_param->param_hdr.length);
3379 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3380 length);
3381 asconf_len -= length;
3382 }
3383
3384 /* Free the cached last sent asconf chunk. */
Vlad Yasevich5f9646c2008-02-05 14:23:44 -05003385 list_del_init(&asconf->transmitted_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003386 sctp_chunk_free(asconf);
3387 asoc->addip_last_asconf = NULL;
3388
Linus Torvalds1da177e2005-04-16 15:20:36 -07003389 return retval;
3390}
3391
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003392/* Make a FWD TSN chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003393struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3394 __u32 new_cum_tsn, size_t nstreams,
3395 struct sctp_fwdtsn_skip *skiplist)
3396{
3397 struct sctp_chunk *retval = NULL;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003398 struct sctp_fwdtsn_hdr ftsn_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399 struct sctp_fwdtsn_skip skip;
3400 size_t hint;
3401 int i;
3402
3403 hint = (nstreams + 1) * sizeof(__u32);
3404
Linus Torvalds1da177e2005-04-16 15:20:36 -07003405 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3406
3407 if (!retval)
3408 return NULL;
3409
Linus Torvalds1da177e2005-04-16 15:20:36 -07003410 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3411 retval->subh.fwdtsn_hdr =
3412 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3413
3414 for (i = 0; i < nstreams; i++) {
3415 skip.stream = skiplist[i].stream;
3416 skip.ssn = skiplist[i].ssn;
3417 sctp_addto_chunk(retval, sizeof(skip), &skip);
3418 }
3419
3420 return retval;
3421}