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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
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080026 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020031 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * C. Robin <chris@hundredacre.ac.uk>
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * Xingang Guo <xingang.guo@intel.com>
39 * Dajiang Zhang <dajiang.zhang@nokia.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Ardelle Fan <ardelle.fan@intel.com>
43 * Kevin Gao <kevin.gao@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 */
45
Joe Perches145ce502010-08-24 13:21:08 +000046#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/types.h>
49#include <linux/kernel.h>
50#include <linux/ip.h>
51#include <linux/ipv6.h>
52#include <linux/net.h>
53#include <linux/inet.h>
Christian Borntraegerebc3bbc2007-10-23 12:46:32 +020054#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/crypto.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090056#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <net/sock.h>
58
59#include <linux/skbuff.h>
60#include <linux/random.h> /* for get_random_bytes */
61#include <net/sctp/sctp.h>
62#include <net/sctp/sm.h>
63
Vlad Yasevich072017b2013-08-09 22:05:36 -040064static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
65 __u8 type, __u8 flags, int paylen);
66static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
67 __u8 flags, int paylen);
68static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
69 __u8 type, __u8 flags, int paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
71 const struct sctp_association *asoc,
72 const struct sctp_chunk *init_chunk,
73 int *cookie_len,
74 const __u8 *raw_addrs, int addrs_len);
75static int sctp_process_param(struct sctp_association *asoc,
76 union sctp_params param,
77 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +010078 gfp_t gfp);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -050079static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
80 const void *data);
stephen hemminger6daaf0d2014-01-09 22:31:11 -080081static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
82 const void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Vlad Yasevich072017b2013-08-09 22:05:36 -040084/* Control chunk destructor */
85static void sctp_control_release_owner(struct sk_buff *skb)
86{
87 /*TODO: do memory release */
88}
89
90static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
91{
92 struct sctp_association *asoc = chunk->asoc;
93 struct sk_buff *skb = chunk->skb;
94
95 /* TODO: properly account for control chunks.
96 * To do it right we'll need:
97 * 1) endpoint if association isn't known.
98 * 2) proper memory accounting.
99 *
100 * For now don't do anything for now.
101 */
102 skb->sk = asoc ? asoc->base.sk : NULL;
103 skb->destructor = sctp_control_release_owner;
104}
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/* What was the inbound interface for this chunk? */
107int sctp_chunk_iif(const struct sctp_chunk *chunk)
108{
109 struct sctp_af *af;
110 int iif = 0;
111
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700112 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (af)
114 iif = af->skb_iif(chunk->skb);
115
116 return iif;
117}
118
119/* RFC 2960 3.3.2 Initiation (INIT) (1)
120 *
121 * Note 2: The ECN capable field is reserved for future use of
122 * Explicit Congestion Notification.
123 */
124static const struct sctp_paramhdr ecap_param = {
125 SCTP_PARAM_ECN_CAPABLE,
Harvey Harrison09640e62009-02-01 00:45:17 -0800126 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127};
128static const struct sctp_paramhdr prsctp_param = {
129 SCTP_PARAM_FWD_TSN_SUPPORT,
Harvey Harrison09640e62009-02-01 00:45:17 -0800130 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131};
132
Neil Horman5fa782c2010-04-28 10:30:59 +0000133/* A helper to initialize an op error inside a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * provided chunk, as most cause codes will be embedded inside an
135 * abort chunk.
136 */
Al Viro5bf2db02006-11-20 16:59:45 -0800137void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800138 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
140 sctp_errhdr_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 __u16 len;
142
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900143 /* Cause code constants are now defined in network order. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 err.cause = cause_code;
145 len = sizeof(sctp_errhdr_t) + paylen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 err.length = htons(len);
Vlad Yasevich4a1c0102007-01-09 14:35:51 -0800147 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
Neil Horman5fa782c2010-04-28 10:30:59 +0000150/* A helper to initialize an op error inside a
151 * provided chunk, as most cause codes will be embedded inside an
152 * abort chunk. Differs from sctp_init_cause in that it won't oops
153 * if there isn't enough space in the op error chunk
154 */
Ioan Orghicidb28aaf2012-07-13 07:16:37 +0000155static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
Neil Horman5fa782c2010-04-28 10:30:59 +0000156 size_t paylen)
157{
158 sctp_errhdr_t err;
159 __u16 len;
160
161 /* Cause code constants are now defined in network order. */
162 err.cause = cause_code;
163 len = sizeof(sctp_errhdr_t) + paylen;
164 err.length = htons(len);
165
Wei Yongjun2e3219b2010-05-17 22:51:58 -0700166 if (skb_tailroom(chunk->skb) < len)
Neil Horman5fa782c2010-04-28 10:30:59 +0000167 return -ENOSPC;
168 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
169 sizeof(sctp_errhdr_t),
170 &err);
171 return 0;
172}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173/* 3.3.2 Initiation (INIT) (1)
174 *
175 * This chunk is used to initiate a SCTP association between two
176 * endpoints. The format of the INIT chunk is shown below:
177 *
178 * 0 1 2 3
179 * 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
180 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * | Type = 1 | Chunk Flags | Chunk Length |
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Initiate Tag |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Advertised Receiver Window Credit (a_rwnd) |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * | Number of Outbound Streams | Number of Inbound Streams |
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * | Initial TSN |
190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
191 * \ \
192 * / Optional/Variable-Length Parameters /
193 * \ \
194 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
195 *
196 *
197 * The INIT chunk contains the following parameters. Unless otherwise
198 * noted, each parameter MUST only be included once in the INIT chunk.
199 *
200 * Fixed Parameters Status
201 * ----------------------------------------------
202 * Initiate Tag Mandatory
203 * Advertised Receiver Window Credit Mandatory
204 * Number of Outbound Streams Mandatory
205 * Number of Inbound Streams Mandatory
206 * Initial TSN Mandatory
207 *
208 * Variable Parameters Status Type Value
209 * -------------------------------------------------------------
210 * IPv4 Address (Note 1) Optional 5
211 * IPv6 Address (Note 1) Optional 6
212 * Cookie Preservative Optional 9
213 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
214 * Host Name Address (Note 3) Optional 11
215 * Supported Address Types (Note 4) Optional 12
216 */
217struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
218 const struct sctp_bind_addr *bp,
Al Virodd0fc662005-10-07 07:46:04 +0100219 gfp_t gfp, int vparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000221 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 sctp_inithdr_t init;
223 union sctp_params addrs;
224 size_t chunksize;
225 struct sctp_chunk *retval = NULL;
226 int num_types, addrs_len = 0;
227 struct sctp_sock *sp;
228 sctp_supported_addrs_param_t sat;
Al Viro3dbe8652006-11-20 17:25:49 -0800229 __be16 types[2];
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800230 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700231 sctp_supported_ext_param_t ext_param;
232 int num_ext = 0;
233 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700234 sctp_paramhdr_t *auth_chunks = NULL,
235 *auth_hmacs = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 *
239 * Note 1: The INIT chunks can contain multiple addresses that
240 * can be IPv4 and/or IPv6 in any combination.
241 */
242 retval = NULL;
243
244 /* Convert the provided bind address list to raw format. */
245 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
246
247 init.init_tag = htonl(asoc->c.my_vtag);
248 init.a_rwnd = htonl(asoc->rwnd);
249 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
250 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
251 init.initial_tsn = htonl(asoc->c.initial_tsn);
252
253 /* How many address types are needed? */
254 sp = sctp_sk(asoc->base.sk);
255 num_types = sp->pf->supported_addrs(sp, types);
256
Wei Yongjuna8170c32010-04-28 08:47:21 +0000257 chunksize = sizeof(init) + addrs_len;
258 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 chunksize += sizeof(ecap_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500260
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000261 if (net->sctp.prsctp_enable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800262 chunksize += sizeof(prsctp_param);
263
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700264 /* ADDIP: Section 4.2.7:
265 * An implementation supporting this extension [ADDIP] MUST list
266 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
267 * INIT-ACK parameters.
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700268 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000269 if (net->sctp.addip_enable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700270 extensions[num_ext] = SCTP_CID_ASCONF;
271 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
272 num_ext += 2;
273 }
274
malc6fc791e2009-03-12 09:49:20 +0000275 if (sp->adaptation_ind)
276 chunksize += sizeof(aiparam);
277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 chunksize += vparam_len;
279
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700280 /* Account for AUTH related parameters */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000281 if (net->sctp.auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700282 /* Add random parameter length*/
283 chunksize += sizeof(asoc->c.auth_random);
284
285 /* Add HMACS parameter length if any were defined */
286 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
287 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000288 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700289 else
290 auth_hmacs = NULL;
291
292 /* Add CHUNKS parameter length */
293 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
294 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000295 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700296 else
Vlad Yasevich9baffaa2007-11-29 08:44:34 -0500297 auth_chunks = NULL;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700298
299 extensions[num_ext] = SCTP_CID_AUTH;
300 num_ext += 1;
301 }
302
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700303 /* If we have any extensions to report, account for that */
304 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000305 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
306 num_ext);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 *
310 * Note 3: An INIT chunk MUST NOT contain more than one Host
311 * Name address parameter. Moreover, the sender of the INIT
312 * MUST NOT combine any other address types with the Host Name
313 * address in the INIT. The receiver of INIT MUST ignore any
314 * other address types if the Host Name address parameter is
315 * present in the received INIT chunk.
316 *
317 * PLEASE DO NOT FIXME [This version does not support Host Name.]
318 */
319
Vlad Yasevich072017b2013-08-09 22:05:36 -0400320 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (!retval)
322 goto nodata;
323
324 retval->subh.init_hdr =
325 sctp_addto_chunk(retval, sizeof(init), &init);
326 retval->param_hdr.v =
327 sctp_addto_chunk(retval, addrs_len, addrs.v);
328
329 /* RFC 2960 3.3.2 Initiation (INIT) (1)
330 *
331 * Note 4: This parameter, when present, specifies all the
332 * address types the sending endpoint can support. The absence
333 * of this parameter indicates that the sending endpoint can
334 * support any address type.
335 */
336 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
337 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
338 sctp_addto_chunk(retval, sizeof(sat), &sat);
339 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
340
341 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700342
Joe Perches7aa1b542007-12-20 14:03:52 -0800343 /* Add the supported extensions parameter. Be nice and add this
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700344 * fist before addiding the parameters for the extensions themselves
345 */
346 if (num_ext) {
347 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
348 ext_param.param_hdr.length =
349 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
350 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
351 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500352 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700353 }
354
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000355 if (net->sctp.prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700357
malc6fc791e2009-03-12 09:49:20 +0000358 if (sp->adaptation_ind) {
359 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
360 aiparam.param_hdr.length = htons(sizeof(aiparam));
361 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
362 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
363 }
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700364
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700365 /* Add SCTP-AUTH chunks to the parameter list */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000366 if (net->sctp.auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700367 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
368 asoc->c.auth_random);
369 if (auth_hmacs)
370 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
371 auth_hmacs);
372 if (auth_chunks)
373 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
374 auth_chunks);
375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376nodata:
Jesper Juhla51482b2005-11-08 09:41:34 -0800377 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return retval;
379}
380
381struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
382 const struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100383 gfp_t gfp, int unkparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
385 sctp_inithdr_t initack;
386 struct sctp_chunk *retval;
387 union sctp_params addrs;
malc6fc791e2009-03-12 09:49:20 +0000388 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 int addrs_len;
390 sctp_cookie_param_t *cookie;
391 int cookie_len;
392 size_t chunksize;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800393 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700394 sctp_supported_ext_param_t ext_param;
395 int num_ext = 0;
396 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700397 sctp_paramhdr_t *auth_chunks = NULL,
398 *auth_hmacs = NULL,
399 *auth_random = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 retval = NULL;
402
403 /* Note: there may be no addresses to embed. */
404 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
405
406 initack.init_tag = htonl(asoc->c.my_vtag);
407 initack.a_rwnd = htonl(asoc->rwnd);
408 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
409 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
410 initack.initial_tsn = htonl(asoc->c.initial_tsn);
411
412 /* FIXME: We really ought to build the cookie right
413 * into the packet instead of allocating more fresh memory.
414 */
415 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
416 addrs.v, addrs_len);
417 if (!cookie)
418 goto nomem_cookie;
419
420 /* Calculate the total size of allocation, include the reserved
421 * space for reporting unknown parameters if it is specified.
422 */
malc6fc791e2009-03-12 09:49:20 +0000423 sp = sctp_sk(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
425
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900426 /* Tell peer that we'll do ECN only if peer advertised such cap. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (asoc->peer.ecn_capable)
428 chunksize += sizeof(ecap_param);
429
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000430 if (asoc->peer.prsctp_capable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800431 chunksize += sizeof(prsctp_param);
432
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000433 if (asoc->peer.asconf_capable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700434 extensions[num_ext] = SCTP_CID_ASCONF;
435 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
436 num_ext += 2;
437 }
438
malc6fc791e2009-03-12 09:49:20 +0000439 if (sp->adaptation_ind)
440 chunksize += sizeof(aiparam);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700442 if (asoc->peer.auth_capable) {
443 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
444 chunksize += ntohs(auth_random->length);
445
446 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
447 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000448 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700449 else
450 auth_hmacs = NULL;
451
452 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
453 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000454 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700455 else
456 auth_chunks = NULL;
457
458 extensions[num_ext] = SCTP_CID_AUTH;
459 num_ext += 1;
460 }
461
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500462 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000463 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
464 num_ext);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 /* Now allocate and fill out the chunk. */
Vlad Yasevich072017b2013-08-09 22:05:36 -0400467 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (!retval)
469 goto nomem_chunk;
470
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400471 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
472 *
473 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
474 * HEARTBEAT ACK, * etc.) to the same destination transport
475 * address from which it received the DATA or control chunk
476 * to which it is replying.
477 *
478 * [INIT ACK back to where the INIT came from.]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 */
480 retval->transport = chunk->transport;
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 retval->subh.init_hdr =
483 sctp_addto_chunk(retval, sizeof(initack), &initack);
484 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
485 sctp_addto_chunk(retval, cookie_len, cookie);
486 if (asoc->peer.ecn_capable)
487 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700488 if (num_ext) {
489 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
490 ext_param.param_hdr.length =
491 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
492 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
493 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500494 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (asoc->peer.prsctp_capable)
497 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
498
malc6fc791e2009-03-12 09:49:20 +0000499 if (sp->adaptation_ind) {
500 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
501 aiparam.param_hdr.length = htons(sizeof(aiparam));
502 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
503 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700506 if (asoc->peer.auth_capable) {
507 sctp_addto_chunk(retval, ntohs(auth_random->length),
508 auth_random);
509 if (auth_hmacs)
510 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
511 auth_hmacs);
512 if (auth_chunks)
513 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
514 auth_chunks);
515 }
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 /* We need to remove the const qualifier at this point. */
518 retval->asoc = (struct sctp_association *) asoc;
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520nomem_chunk:
521 kfree(cookie);
522nomem_cookie:
Jesper Juhla51482b2005-11-08 09:41:34 -0800523 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return retval;
525}
526
527/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
528 *
529 * This chunk is used only during the initialization of an association.
530 * It is sent by the initiator of an association to its peer to complete
531 * the initialization process. This chunk MUST precede any DATA chunk
532 * sent within the association, but MAY be bundled with one or more DATA
533 * chunks in the same packet.
534 *
535 * 0 1 2 3
536 * 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
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * | Type = 10 |Chunk Flags | Length |
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
540 * / Cookie /
541 * \ \
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
543 *
544 * Chunk Flags: 8 bit
545 *
546 * Set to zero on transmit and ignored on receipt.
547 *
548 * Length: 16 bits (unsigned integer)
549 *
550 * Set to the size of the chunk in bytes, including the 4 bytes of
551 * the chunk header and the size of the Cookie.
552 *
553 * Cookie: variable size
554 *
555 * This field must contain the exact cookie received in the
556 * State Cookie parameter from the previous INIT ACK.
557 *
558 * An implementation SHOULD make the cookie as small as possible
559 * to insure interoperability.
560 */
561struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
562 const struct sctp_chunk *chunk)
563{
564 struct sctp_chunk *retval;
565 void *cookie;
566 int cookie_len;
567
568 cookie = asoc->peer.cookie;
569 cookie_len = asoc->peer.cookie_len;
570
571 /* Build a cookie echo chunk. */
Vlad Yasevich072017b2013-08-09 22:05:36 -0400572 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (!retval)
574 goto nodata;
575 retval->subh.cookie_hdr =
576 sctp_addto_chunk(retval, cookie_len, cookie);
577
578 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
579 *
580 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
581 * HEARTBEAT ACK, * etc.) to the same destination transport
582 * address from which it * received the DATA or control chunk
583 * to which it is replying.
584 *
585 * [COOKIE ECHO back to where the INIT ACK came from.]
586 */
587 if (chunk)
588 retval->transport = chunk->transport;
589
590nodata:
591 return retval;
592}
593
594/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
595 *
596 * This chunk is used only during the initialization of an
597 * association. It is used to acknowledge the receipt of a COOKIE
598 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
599 * within the association, but MAY be bundled with one or more DATA
600 * chunks or SACK chunk in the same SCTP packet.
601 *
602 * 0 1 2 3
603 * 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
604 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
605 * | Type = 11 |Chunk Flags | Length = 4 |
606 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
607 *
608 * Chunk Flags: 8 bits
609 *
610 * Set to zero on transmit and ignored on receipt.
611 */
612struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
613 const struct sctp_chunk *chunk)
614{
615 struct sctp_chunk *retval;
616
Vlad Yasevich072017b2013-08-09 22:05:36 -0400617 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
620 *
621 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
622 * HEARTBEAT ACK, * etc.) to the same destination transport
623 * address from which it * received the DATA or control chunk
624 * to which it is replying.
625 *
626 * [COOKIE ACK back to where the COOKIE ECHO came from.]
627 */
628 if (retval && chunk)
629 retval->transport = chunk->transport;
630
631 return retval;
632}
633
634/*
635 * Appendix A: Explicit Congestion Notification:
636 * CWR:
637 *
638 * RFC 2481 details a specific bit for a sender to send in the header of
639 * its next outbound TCP segment to indicate to its peer that it has
640 * reduced its congestion window. This is termed the CWR bit. For
641 * SCTP the same indication is made by including the CWR chunk.
642 * This chunk contains one data element, i.e. the TSN number that
643 * was sent in the ECNE chunk. This element represents the lowest
644 * TSN number in the datagram that was originally marked with the
645 * CE bit.
646 *
647 * 0 1 2 3
648 * 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
649 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
650 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
651 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
652 * | Lowest TSN Number |
653 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
654 *
655 * Note: The CWR is considered a Control chunk.
656 */
657struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
658 const __u32 lowest_tsn,
659 const struct sctp_chunk *chunk)
660{
661 struct sctp_chunk *retval;
662 sctp_cwrhdr_t cwr;
663
664 cwr.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400665 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
666 sizeof(sctp_cwrhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 if (!retval)
669 goto nodata;
670
671 retval->subh.ecn_cwr_hdr =
672 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
673
674 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
675 *
676 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
677 * HEARTBEAT ACK, * etc.) to the same destination transport
678 * address from which it * received the DATA or control chunk
679 * to which it is replying.
680 *
681 * [Report a reduced congestion window back to where the ECNE
682 * came from.]
683 */
684 if (chunk)
685 retval->transport = chunk->transport;
686
687nodata:
688 return retval;
689}
690
691/* Make an ECNE chunk. This is a congestion experienced report. */
692struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
693 const __u32 lowest_tsn)
694{
695 struct sctp_chunk *retval;
696 sctp_ecnehdr_t ecne;
697
698 ecne.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400699 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
700 sizeof(sctp_ecnehdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!retval)
702 goto nodata;
703 retval->subh.ecne_hdr =
704 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
705
706nodata:
707 return retval;
708}
709
710/* Make a DATA chunk for the given association from the provided
711 * parameters. However, do not populate the data payload.
712 */
713struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
714 const struct sctp_sndrcvinfo *sinfo,
715 int data_len, __u8 flags, __u16 ssn)
716{
717 struct sctp_chunk *retval;
718 struct sctp_datahdr dp;
719 int chunk_len;
720
721 /* We assign the TSN as LATE as possible, not here when
722 * creating the chunk.
723 */
724 dp.tsn = 0;
725 dp.stream = htons(sinfo->sinfo_stream);
726 dp.ppid = sinfo->sinfo_ppid;
727
728 /* Set the flags for an unordered send. */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700729 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 flags |= SCTP_DATA_UNORDERED;
731 dp.ssn = 0;
732 } else
733 dp.ssn = htons(ssn);
734
735 chunk_len = sizeof(dp) + data_len;
Vlad Yasevich072017b2013-08-09 22:05:36 -0400736 retval = sctp_make_data(asoc, flags, chunk_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (!retval)
738 goto nodata;
739
740 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
741 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
742
743nodata:
744 return retval;
745}
746
747/* Create a selective ackowledgement (SACK) for the given
748 * association. This reports on which TSN's we've seen to date,
749 * including duplicates and gaps.
750 */
751struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
752{
753 struct sctp_chunk *retval;
754 struct sctp_sackhdr sack;
755 int len;
756 __u32 ctsn;
757 __u16 num_gabs, num_dup_tsns;
Neil Horman42448542012-06-30 03:04:26 +0000758 struct sctp_association *aptr = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
Vlad Yasevich02015182008-10-08 14:19:01 -0700760 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
Neil Horman42448542012-06-30 03:04:26 +0000761 struct sctp_transport *trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Vlad Yasevich02015182008-10-08 14:19:01 -0700763 memset(gabs, 0, sizeof(gabs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 ctsn = sctp_tsnmap_get_ctsn(map);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200765
766 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 /* How much room is needed in the chunk? */
Vlad Yasevich02015182008-10-08 14:19:01 -0700769 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 num_dup_tsns = sctp_tsnmap_num_dups(map);
771
772 /* Initialize the SACK header. */
773 sack.cum_tsn_ack = htonl(ctsn);
774 sack.a_rwnd = htonl(asoc->a_rwnd);
775 sack.num_gap_ack_blocks = htons(num_gabs);
776 sack.num_dup_tsns = htons(num_dup_tsns);
777
778 len = sizeof(sack)
779 + sizeof(struct sctp_gap_ack_block) * num_gabs
780 + sizeof(__u32) * num_dup_tsns;
781
782 /* Create the chunk. */
Vlad Yasevich072017b2013-08-09 22:05:36 -0400783 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 if (!retval)
785 goto nodata;
786
787 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
788 *
789 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
790 * HEARTBEAT ACK, etc.) to the same destination transport
791 * address from which it received the DATA or control chunk to
792 * which it is replying. This rule should also be followed if
793 * the endpoint is bundling DATA chunks together with the
794 * reply chunk.
795 *
796 * However, when acknowledging multiple DATA chunks received
797 * in packets from different source addresses in a single
798 * SACK, the SACK chunk may be transmitted to one of the
799 * destination transport addresses from which the DATA or
800 * control chunks being acknowledged were received.
801 *
802 * [BUG: We do not implement the following paragraph.
803 * Perhaps we should remember the last transport we used for a
804 * SACK and avoid that (if possible) if we have seen any
805 * duplicates. --piggy]
806 *
807 * When a receiver of a duplicate DATA chunk sends a SACK to a
808 * multi- homed endpoint it MAY be beneficial to vary the
809 * destination address and not use the source address of the
810 * DATA chunk. The reason being that receiving a duplicate
811 * from a multi-homed endpoint might indicate that the return
812 * path (as specified in the source address of the DATA chunk)
813 * for the SACK is broken.
814 *
815 * [Send to the address from which we last received a DATA chunk.]
816 */
817 retval->transport = asoc->peer.last_data_from;
818
819 retval->subh.sack_hdr =
820 sctp_addto_chunk(retval, sizeof(sack), &sack);
821
822 /* Add the gap ack block information. */
823 if (num_gabs)
824 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
Vlad Yasevich02015182008-10-08 14:19:01 -0700825 gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 /* Add the duplicate TSN information. */
Michele Baldessari196d6752012-12-01 04:49:42 +0000828 if (num_dup_tsns) {
829 aptr->stats.idupchunks += num_dup_tsns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
831 sctp_tsnmap_get_dups(map));
Michele Baldessari196d6752012-12-01 04:49:42 +0000832 }
Neil Horman42448542012-06-30 03:04:26 +0000833 /* Once we have a sack generated, check to see what our sack
834 * generation is, if its 0, reset the transports to 0, and reset
835 * the association generation to 1
836 *
837 * The idea is that zero is never used as a valid generation for the
838 * association so no transport will match after a wrap event like this,
839 * Until the next sack
840 */
841 if (++aptr->peer.sack_generation == 0) {
842 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
843 transports)
844 trans->sack_generation = 0;
845 aptr->peer.sack_generation = 1;
846 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847nodata:
848 return retval;
849}
850
851/* Make a SHUTDOWN chunk. */
852struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
853 const struct sctp_chunk *chunk)
854{
855 struct sctp_chunk *retval;
856 sctp_shutdownhdr_t shut;
857 __u32 ctsn;
858
859 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
860 shut.cum_tsn_ack = htonl(ctsn);
861
Vlad Yasevich072017b2013-08-09 22:05:36 -0400862 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
863 sizeof(sctp_shutdownhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 if (!retval)
865 goto nodata;
866
867 retval->subh.shutdown_hdr =
868 sctp_addto_chunk(retval, sizeof(shut), &shut);
869
870 if (chunk)
871 retval->transport = chunk->transport;
872nodata:
873 return retval;
874}
875
876struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
877 const struct sctp_chunk *chunk)
878{
879 struct sctp_chunk *retval;
880
Vlad Yasevich072017b2013-08-09 22:05:36 -0400881 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
883 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
884 *
885 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
886 * HEARTBEAT ACK, * etc.) to the same destination transport
887 * address from which it * received the DATA or control chunk
888 * to which it is replying.
889 *
890 * [ACK back to where the SHUTDOWN came from.]
891 */
892 if (retval && chunk)
893 retval->transport = chunk->transport;
894
895 return retval;
896}
897
898struct sctp_chunk *sctp_make_shutdown_complete(
899 const struct sctp_association *asoc,
900 const struct sctp_chunk *chunk)
901{
902 struct sctp_chunk *retval;
903 __u8 flags = 0;
904
Jerome Forissier047a2422005-04-28 11:58:43 -0700905 /* Set the T-bit if we have no association (vtag will be
906 * reflected)
907 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
909
Vlad Yasevich072017b2013-08-09 22:05:36 -0400910 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
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 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
920 * came from.]
921 */
922 if (retval && chunk)
923 retval->transport = chunk->transport;
924
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900925 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926}
927
928/* Create an ABORT. Note that we set the T bit if we have no
Jerome Forissier047a2422005-04-28 11:58:43 -0700929 * association, except when responding to an INIT (sctpimpguide 2.41).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 */
931struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
932 const struct sctp_chunk *chunk,
933 const size_t hint)
934{
935 struct sctp_chunk *retval;
936 __u8 flags = 0;
937
Jerome Forissier047a2422005-04-28 11:58:43 -0700938 /* Set the T-bit if we have no association and 'chunk' is not
939 * an INIT (vtag will be reflected).
940 */
941 if (!asoc) {
942 if (chunk && chunk->chunk_hdr &&
943 chunk->chunk_hdr->type == SCTP_CID_INIT)
944 flags = 0;
945 else
946 flags = SCTP_CHUNK_FLAG_T;
947 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Vlad Yasevich072017b2013-08-09 22:05:36 -0400949 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
952 *
953 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
954 * HEARTBEAT ACK, * etc.) to the same destination transport
955 * address from which it * received the DATA or control chunk
956 * to which it is replying.
957 *
958 * [ABORT back to where the offender came from.]
959 */
960 if (retval && chunk)
961 retval->transport = chunk->transport;
962
963 return retval;
964}
965
966/* Helper to create ABORT with a NO_USER_DATA error. */
967struct sctp_chunk *sctp_make_abort_no_data(
968 const struct sctp_association *asoc,
969 const struct sctp_chunk *chunk, __u32 tsn)
970{
971 struct sctp_chunk *retval;
Al Viro9f81bcd2006-11-20 17:26:34 -0800972 __be32 payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
975 + sizeof(tsn));
976
977 if (!retval)
978 goto no_mem;
979
980 /* Put the tsn back into network byte order. */
981 payload = htonl(tsn);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800982 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
983 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
986 *
987 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
988 * HEARTBEAT ACK, * etc.) to the same destination transport
989 * address from which it * received the DATA or control chunk
990 * to which it is replying.
991 *
992 * [ABORT back to where the offender came from.]
993 */
994 if (chunk)
995 retval->transport = chunk->transport;
996
997no_mem:
998 return retval;
999}
1000
1001/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1002struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001003 const struct msghdr *msg,
1004 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005{
1006 struct sctp_chunk *retval;
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001007 void *payload = NULL;
1008 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001010 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 if (!retval)
1012 goto err_chunk;
1013
1014 if (paylen) {
1015 /* Put the msg_iov together into payload. */
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001016 payload = kmalloc(paylen, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 if (!payload)
1018 goto err_payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001020 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
1021 if (err < 0)
1022 goto err_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 }
1024
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001025 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1026 sctp_addto_chunk(retval, paylen, payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
1028 if (paylen)
1029 kfree(payload);
1030
1031 return retval;
1032
1033err_copy:
1034 kfree(payload);
1035err_payload:
1036 sctp_chunk_free(retval);
1037 retval = NULL;
1038err_chunk:
1039 return retval;
1040}
1041
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001042/* Append bytes to the end of a parameter. Will panic if chunk is not big
1043 * enough.
1044 */
1045static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1046 const void *data)
1047{
1048 void *target;
1049 int chunklen = ntohs(chunk->chunk_hdr->length);
1050
1051 target = skb_put(chunk->skb, len);
1052
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001053 if (data)
1054 memcpy(target, data, len);
1055 else
1056 memset(target, 0, len);
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001057
1058 /* Adjust the chunk length field. */
1059 chunk->chunk_hdr->length = htons(chunklen + len);
1060 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1061
1062 return target;
1063}
1064
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001065/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066struct sctp_chunk *sctp_make_abort_violation(
1067 const struct sctp_association *asoc,
1068 const struct sctp_chunk *chunk,
1069 const __u8 *payload,
1070 const size_t paylen)
1071{
1072 struct sctp_chunk *retval;
1073 struct sctp_paramhdr phdr;
1074
1075 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001076 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (!retval)
1078 goto end;
1079
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001080 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1081 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
1083 phdr.type = htons(chunk->chunk_hdr->type);
1084 phdr.length = chunk->chunk_hdr->length;
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001085 sctp_addto_chunk(retval, paylen, payload);
1086 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087
1088end:
1089 return retval;
1090}
1091
Wei Yongjunba016672008-09-30 05:32:24 -07001092struct sctp_chunk *sctp_make_violation_paramlen(
1093 const struct sctp_association *asoc,
1094 const struct sctp_chunk *chunk,
1095 struct sctp_paramhdr *param)
1096{
1097 struct sctp_chunk *retval;
1098 static const char error[] = "The following parameter had invalid length:";
1099 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1100 sizeof(sctp_paramhdr_t);
1101
1102 retval = sctp_make_abort(asoc, chunk, payload_len);
1103 if (!retval)
1104 goto nodata;
1105
1106 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1107 sizeof(error) + sizeof(sctp_paramhdr_t));
1108 sctp_addto_chunk(retval, sizeof(error), error);
1109 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1110
1111nodata:
1112 return retval;
1113}
1114
Neil Hormande4594a2012-11-20 10:14:30 +00001115struct sctp_chunk *sctp_make_violation_max_retrans(
1116 const struct sctp_association *asoc,
1117 const struct sctp_chunk *chunk)
1118{
1119 struct sctp_chunk *retval;
1120 static const char error[] = "Association exceeded its max_retans count";
1121 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1122
1123 retval = sctp_make_abort(asoc, chunk, payload_len);
1124 if (!retval)
1125 goto nodata;
1126
1127 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1128 sctp_addto_chunk(retval, sizeof(error), error);
1129
1130nodata:
1131 return retval;
1132}
1133
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134/* Make a HEARTBEAT chunk. */
1135struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
Wei Yongjun92c73af2011-04-19 21:31:47 +00001136 const struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137{
Wei Yongjun92c73af2011-04-19 21:31:47 +00001138 struct sctp_chunk *retval;
1139 sctp_sender_hb_info_t hbinfo;
1140
Vlad Yasevich072017b2013-08-09 22:05:36 -04001141 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 if (!retval)
1144 goto nodata;
1145
Wei Yongjun92c73af2011-04-19 21:31:47 +00001146 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1147 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1148 hbinfo.daddr = transport->ipaddr;
1149 hbinfo.sent_at = jiffies;
1150 hbinfo.hb_nonce = transport->hb_nonce;
1151
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 /* Cast away the 'const', as this is just telling the chunk
1153 * what transport it belongs to.
1154 */
1155 retval->transport = (struct sctp_transport *) transport;
Wei Yongjun92c73af2011-04-19 21:31:47 +00001156 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1157 &hbinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158
1159nodata:
1160 return retval;
1161}
1162
1163struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1164 const struct sctp_chunk *chunk,
1165 const void *payload, const size_t paylen)
1166{
1167 struct sctp_chunk *retval;
1168
Vlad Yasevich072017b2013-08-09 22:05:36 -04001169 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 if (!retval)
1171 goto nodata;
1172
1173 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1174
1175 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1176 *
1177 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1178 * HEARTBEAT ACK, * etc.) to the same destination transport
1179 * address from which it * received the DATA or control chunk
1180 * to which it is replying.
1181 *
1182 * [HBACK back to where the HEARTBEAT came from.]
1183 */
1184 if (chunk)
1185 retval->transport = chunk->transport;
1186
1187nodata:
1188 return retval;
1189}
1190
1191/* Create an Operation Error chunk with the specified space reserved.
1192 * This routine can be used for containing multiple causes in the chunk.
1193 */
1194static struct sctp_chunk *sctp_make_op_error_space(
1195 const struct sctp_association *asoc,
1196 const struct sctp_chunk *chunk,
1197 size_t size)
1198{
1199 struct sctp_chunk *retval;
1200
Vlad Yasevich072017b2013-08-09 22:05:36 -04001201 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1202 sizeof(sctp_errhdr_t) + size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 if (!retval)
1204 goto nodata;
1205
1206 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1207 *
1208 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1209 * HEARTBEAT ACK, etc.) to the same destination transport
1210 * address from which it received the DATA or control chunk
1211 * to which it is replying.
1212 *
1213 */
1214 if (chunk)
1215 retval->transport = chunk->transport;
1216
1217nodata:
1218 return retval;
1219}
1220
Neil Horman5fa782c2010-04-28 10:30:59 +00001221/* Create an Operation Error chunk of a fixed size,
1222 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1223 * This is a helper function to allocate an error chunk for
1224 * for those invalid parameter codes in which we may not want
Jorrit Schippersd82603c2012-12-27 17:33:02 +01001225 * to report all the errors, if the incoming chunk is large
Neil Horman5fa782c2010-04-28 10:30:59 +00001226 */
1227static inline struct sctp_chunk *sctp_make_op_error_fixed(
1228 const struct sctp_association *asoc,
1229 const struct sctp_chunk *chunk)
1230{
1231 size_t size = asoc ? asoc->pathmtu : 0;
1232
1233 if (!size)
1234 size = SCTP_DEFAULT_MAXSEGMENT;
1235
1236 return sctp_make_op_error_space(asoc, chunk, size);
1237}
1238
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239/* Create an Operation Error chunk. */
1240struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1241 const struct sctp_chunk *chunk,
Al Viro63706c52006-11-20 17:00:05 -08001242 __be16 cause_code, const void *payload,
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001243 size_t paylen, size_t reserve_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244{
1245 struct sctp_chunk *retval;
1246
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001247 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 if (!retval)
1249 goto nodata;
1250
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001251 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001252 sctp_addto_chunk(retval, paylen, payload);
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001253 if (reserve_tail)
1254 sctp_addto_param(retval, reserve_tail, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256nodata:
1257 return retval;
1258}
1259
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001260struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1261{
1262 struct sctp_chunk *retval;
1263 struct sctp_hmac *hmac_desc;
1264 struct sctp_authhdr auth_hdr;
1265 __u8 *hmac;
1266
1267 /* Get the first hmac that the peer told us to use */
1268 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1269 if (unlikely(!hmac_desc))
1270 return NULL;
1271
Vlad Yasevich072017b2013-08-09 22:05:36 -04001272 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001273 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1274 if (!retval)
1275 return NULL;
1276
1277 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1278 auth_hdr.shkey_id = htons(asoc->active_key_id);
1279
1280 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1281 &auth_hdr);
1282
1283 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1284 memset(hmac, 0, hmac_desc->hmac_len);
1285
1286 /* Adjust the chunk header to include the empty MAC */
1287 retval->chunk_hdr->length =
1288 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1289 retval->chunk_end = skb_tail_pointer(retval->skb);
1290
1291 return retval;
1292}
1293
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295/********************************************************************
1296 * 2nd Level Abstractions
1297 ********************************************************************/
1298
1299/* Turn an skb into a chunk.
1300 * FIXME: Eventually move the structure directly inside the skb->cb[].
wangweidong3dc0a542013-10-26 16:06:31 +08001301 *
1302 * sctpimpguide-05.txt Section 2.8.2
1303 * M1) Each time a new DATA chunk is transmitted
1304 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1305 * 'TSN.Missing.Report' count will be used to determine missing chunks
1306 * and when to fast retransmit.
1307 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 */
1309struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1310 const struct sctp_association *asoc,
1311 struct sock *sk)
1312{
1313 struct sctp_chunk *retval;
1314
Robert P. J. Dayc3762222007-02-10 01:45:03 -08001315 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
1317 if (!retval)
1318 goto nodata;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001319 if (!sk)
1320 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
David S. Miller79af02c2005-07-08 21:47:49 -07001322 INIT_LIST_HEAD(&retval->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 retval->skb = skb;
1324 retval->asoc = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 retval->singleton = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Neil Hormanc226ef92008-07-25 12:44:09 -04001327 retval->fast_retransmit = SCTP_CAN_FRTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 /* Polish the bead hole. */
1330 INIT_LIST_HEAD(&retval->transmitted_list);
1331 INIT_LIST_HEAD(&retval->frag_list);
1332 SCTP_DBG_OBJCNT_INC(chunk);
1333 atomic_set(&retval->refcnt, 1);
1334
1335nodata:
1336 return retval;
1337}
1338
1339/* Set chunk->source and dest based on the IP header in chunk->skb. */
1340void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1341 union sctp_addr *dest)
1342{
Al Virof235fca2006-11-20 17:09:01 -08001343 memcpy(&chunk->source, src, sizeof(union sctp_addr));
Al Viro16b0a032006-11-20 17:13:38 -08001344 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345}
1346
1347/* Extract the source address from a chunk. */
1348const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1349{
1350 /* If we have a known transport, use that. */
1351 if (chunk->transport) {
Al Viro6a1e5f32006-11-20 17:12:25 -08001352 return &chunk->transport->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 } else {
1354 /* Otherwise, extract it from the IP header. */
Al Viro6a1e5f32006-11-20 17:12:25 -08001355 return &chunk->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 }
1357}
1358
1359/* Create a new chunk, setting the type and flags headers from the
1360 * arguments, reserving enough space for a 'paylen' byte payload.
1361 */
Vlad Yasevich072017b2013-08-09 22:05:36 -04001362static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1363 __u8 type, __u8 flags, int paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
1365 struct sctp_chunk *retval;
1366 sctp_chunkhdr_t *chunk_hdr;
1367 struct sk_buff *skb;
1368 struct sock *sk;
1369
1370 /* No need to allocate LL here, as this is only a chunk. */
1371 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1372 GFP_ATOMIC);
1373 if (!skb)
1374 goto nodata;
1375
1376 /* Make room for the chunk header. */
1377 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1378 chunk_hdr->type = type;
1379 chunk_hdr->flags = flags;
1380 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1381
1382 sk = asoc ? asoc->base.sk : NULL;
1383 retval = sctp_chunkify(skb, asoc, sk);
1384 if (!retval) {
1385 kfree_skb(skb);
1386 goto nodata;
1387 }
1388
1389 retval->chunk_hdr = chunk_hdr;
1390 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1391
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001392 /* Determine if the chunk needs to be authenticated */
1393 if (sctp_auth_send_cid(type, asoc))
1394 retval->auth = 1;
1395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 return retval;
1397nodata:
1398 return NULL;
1399}
1400
Vlad Yasevich072017b2013-08-09 22:05:36 -04001401static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1402 __u8 flags, int paylen)
1403{
1404 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen);
1405}
1406
1407static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1408 __u8 type, __u8 flags, int paylen)
1409{
1410 struct sctp_chunk *chunk = _sctp_make_chunk(asoc, type, flags, paylen);
1411
1412 if (chunk)
1413 sctp_control_set_owner_w(chunk);
1414
1415 return chunk;
1416}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418/* Release the memory occupied by a chunk. */
1419static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1420{
Vlad Yasevicha08de642007-12-20 14:11:47 -08001421 BUG_ON(!list_empty(&chunk->list));
1422 list_del_init(&chunk->transmitted_list);
1423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1425 dev_kfree_skb(chunk->skb);
1426
1427 SCTP_DBG_OBJCNT_DEC(chunk);
1428 kmem_cache_free(sctp_chunk_cachep, chunk);
1429}
1430
1431/* Possibly, free the chunk. */
1432void sctp_chunk_free(struct sctp_chunk *chunk)
1433{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 /* Release our reference on the message tracker. */
1435 if (chunk->msg)
1436 sctp_datamsg_put(chunk->msg);
1437
1438 sctp_chunk_put(chunk);
1439}
1440
1441/* Grab a reference to the chunk. */
1442void sctp_chunk_hold(struct sctp_chunk *ch)
1443{
1444 atomic_inc(&ch->refcnt);
1445}
1446
1447/* Release a reference to the chunk. */
1448void sctp_chunk_put(struct sctp_chunk *ch)
1449{
1450 if (atomic_dec_and_test(&ch->refcnt))
1451 sctp_chunk_destroy(ch);
1452}
1453
1454/* Append bytes to the end of a chunk. Will panic if chunk is not big
1455 * enough.
1456 */
1457void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1458{
1459 void *target;
1460 void *padding;
1461 int chunklen = ntohs(chunk->chunk_hdr->length);
Wei Yongjun8d614ad2007-08-06 13:55:47 +08001462 int padlen = WORD_ROUND(chunklen) - chunklen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
1464 padding = skb_put(chunk->skb, padlen);
1465 target = skb_put(chunk->skb, len);
1466
1467 memset(padding, 0, padlen);
1468 memcpy(target, data, len);
1469
1470 /* Adjust the chunk length field. */
1471 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001472 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474 return target;
1475}
1476
Neil Horman5fa782c2010-04-28 10:30:59 +00001477/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1478 * space in the chunk
1479 */
stephen hemminger6daaf0d2014-01-09 22:31:11 -08001480static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1481 int len, const void *data)
Neil Horman5fa782c2010-04-28 10:30:59 +00001482{
Wei Yongjun2e3219b2010-05-17 22:51:58 -07001483 if (skb_tailroom(chunk->skb) >= len)
Neil Horman5fa782c2010-04-28 10:30:59 +00001484 return sctp_addto_chunk(chunk, len, data);
1485 else
1486 return NULL;
1487}
1488
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489/* Append bytes from user space to the end of a chunk. Will panic if
1490 * chunk is not big enough.
1491 * Returns a kernel err value.
1492 */
1493int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1494 struct iovec *data)
1495{
1496 __u8 *target;
1497 int err = 0;
1498
1499 /* Make room in chunk for data. */
1500 target = skb_put(chunk->skb, len);
1501
1502 /* Copy data (whole iovec) into chunk */
1503 if ((err = memcpy_fromiovecend(target, data, off, len)))
1504 goto out;
1505
1506 /* Adjust the chunk length field. */
1507 chunk->chunk_hdr->length =
1508 htons(ntohs(chunk->chunk_hdr->length) + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001509 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
1511out:
1512 return err;
1513}
1514
1515/* Helper function to assign a TSN if needed. This assumes that both
1516 * the data_hdr and association have already been assigned.
1517 */
1518void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1519{
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001520 struct sctp_datamsg *msg;
1521 struct sctp_chunk *lchunk;
1522 struct sctp_stream *stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 __u16 ssn;
1524 __u16 sid;
1525
1526 if (chunk->has_ssn)
1527 return;
1528
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001529 /* All fragments will be on the same stream */
1530 sid = ntohs(chunk->subh.data_hdr->stream);
1531 stream = &chunk->asoc->ssnmap->out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001533 /* Now assign the sequence number to the entire message.
1534 * All fragments must have the same stream sequence number.
1535 */
1536 msg = chunk->msg;
1537 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1538 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1539 ssn = 0;
1540 } else {
1541 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1542 ssn = sctp_ssn_next(stream, sid);
1543 else
1544 ssn = sctp_ssn_peek(stream, sid);
1545 }
1546
1547 lchunk->subh.data_hdr->ssn = htons(ssn);
1548 lchunk->has_ssn = 1;
1549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550}
1551
1552/* Helper function to assign a TSN if needed. This assumes that both
1553 * the data_hdr and association have already been assigned.
1554 */
1555void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1556{
1557 if (!chunk->has_tsn) {
1558 /* This is the last possible instant to
1559 * assign a TSN.
1560 */
1561 chunk->subh.data_hdr->tsn =
1562 htonl(sctp_association_get_next_tsn(chunk->asoc));
1563 chunk->has_tsn = 1;
1564 }
1565}
1566
1567/* Create a CLOSED association to use with an incoming packet. */
1568struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -07001569 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +01001570 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571{
1572 struct sctp_association *asoc;
1573 struct sk_buff *skb;
1574 sctp_scope_t scope;
1575 struct sctp_af *af;
1576
1577 /* Create the bare association. */
1578 scope = sctp_scope(sctp_source(chunk));
1579 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1580 if (!asoc)
1581 goto nodata;
1582 asoc->temp = 1;
1583 skb = chunk->skb;
1584 /* Create an entry for the source address of the packet. */
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001585 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 if (unlikely(!af))
1587 goto fail;
Al Virod55c41b2006-11-20 17:09:40 -08001588 af->from_skb(&asoc->c.peer_addr, skb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589nodata:
1590 return asoc;
1591
1592fail:
1593 sctp_association_free(asoc);
1594 return NULL;
1595}
1596
1597/* Build a cookie representing asoc.
1598 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1599 */
1600static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1601 const struct sctp_association *asoc,
1602 const struct sctp_chunk *init_chunk,
1603 int *cookie_len,
1604 const __u8 *raw_addrs, int addrs_len)
1605{
1606 sctp_cookie_param_t *retval;
1607 struct sctp_signed_cookie *cookie;
1608 struct scatterlist sg;
1609 int headersize, bodysize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001611 /* Header size is static data prior to the actual cookie, including
1612 * any padding.
1613 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001614 headersize = sizeof(sctp_paramhdr_t) +
1615 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001616 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 bodysize = sizeof(struct sctp_cookie)
1618 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1619
1620 /* Pad out the cookie to a multiple to make the signature
1621 * functions simpler to write.
1622 */
1623 if (bodysize % SCTP_COOKIE_MULTIPLE)
1624 bodysize += SCTP_COOKIE_MULTIPLE
1625 - (bodysize % SCTP_COOKIE_MULTIPLE);
1626 *cookie_len = headersize + bodysize;
1627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 /* Clear this memory since we are sending this data structure
1629 * out on the network.
1630 */
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02001631 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1632 if (!retval)
1633 goto nodata;
1634
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 cookie = (struct sctp_signed_cookie *) retval->body;
1636
1637 /* Set up the parameter header. */
1638 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1639 retval->p.length = htons(*cookie_len);
1640
1641 /* Copy the cookie part of the association itself. */
1642 cookie->c = asoc->c;
1643 /* Save the raw address list length in the cookie. */
1644 cookie->c.raw_addr_list_len = addrs_len;
1645
1646 /* Remember PR-SCTP capability. */
1647 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1648
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001649 /* Save adaptation indication in the cookie. */
1650 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
1652 /* Set an expiration time for the cookie. */
Daniel Borkmann52db8822013-06-25 18:17:27 +02001653 cookie->c.expiration = ktime_add(asoc->cookie_life,
1654 ktime_get());
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
1656 /* Copy the peer's init packet. */
1657 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1658 ntohs(init_chunk->chunk_hdr->length));
1659
1660 /* Copy the raw local address list of the association. */
1661 memcpy((__u8 *)&cookie->c.peer_init[0] +
1662 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1663
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001664 if (sctp_sk(ep->base.sk)->hmac) {
Herbert Xu1b489e12006-08-20 15:07:14 +10001665 struct hash_desc desc;
1666
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 /* Sign the message. */
Herbert Xu68e3f5d2007-10-27 00:52:07 -07001668 sg_init_one(&sg, &cookie->c, bodysize);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001669 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1670 desc.flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671
Daniel Borkmann570617e2013-02-12 05:15:33 +00001672 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1673 sizeof(ep->secret_key)) ||
Herbert Xu1b489e12006-08-20 15:07:14 +10001674 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1675 goto free_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 }
1677
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 return retval;
Herbert Xu1b489e12006-08-20 15:07:14 +10001679
1680free_cookie:
1681 kfree(retval);
1682nodata:
1683 *cookie_len = 0;
1684 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685}
1686
1687/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1688struct sctp_association *sctp_unpack_cookie(
1689 const struct sctp_endpoint *ep,
1690 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +01001691 struct sctp_chunk *chunk, gfp_t gfp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 int *error, struct sctp_chunk **errp)
1693{
1694 struct sctp_association *retval = NULL;
1695 struct sctp_signed_cookie *cookie;
1696 struct sctp_cookie *bear_cookie;
1697 int headersize, bodysize, fixed_size;
Vlad Yasevich313e7b42006-01-17 11:55:57 -08001698 __u8 *digest = ep->digest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 struct scatterlist sg;
Daniel Borkmann570617e2013-02-12 05:15:33 +00001700 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 sctp_scope_t scope;
1702 struct sk_buff *skb = chunk->skb;
Daniel Borkmann52db8822013-06-25 18:17:27 +02001703 ktime_t kt;
Herbert Xu1b489e12006-08-20 15:07:14 +10001704 struct hash_desc desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001706 /* Header size is static data prior to the actual cookie, including
1707 * any padding.
1708 */
1709 headersize = sizeof(sctp_chunkhdr_t) +
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001710 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001711 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1713 fixed_size = headersize + sizeof(struct sctp_cookie);
1714
1715 /* Verify that the chunk looks like it even has a cookie.
1716 * There must be enough room for our cookie and our peer's
1717 * INIT chunk.
1718 */
1719 len = ntohs(chunk->chunk_hdr->length);
1720 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1721 goto malformed;
1722
1723 /* Verify that the cookie has been padded out. */
1724 if (bodysize % SCTP_COOKIE_MULTIPLE)
1725 goto malformed;
1726
1727 /* Process the cookie. */
1728 cookie = chunk->subh.cookie_hdr;
1729 bear_cookie = &cookie->c;
1730
1731 if (!sctp_sk(ep->base.sk)->hmac)
1732 goto no_hmac;
1733
1734 /* Check the signature. */
Herbert Xu68e3f5d2007-10-27 00:52:07 -07001735 sg_init_one(&sg, bear_cookie, bodysize);
Herbert Xu1b489e12006-08-20 15:07:14 +10001736 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1737 desc.flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738
Al Viro8ca84482006-06-20 03:26:14 -07001739 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
Daniel Borkmann570617e2013-02-12 05:15:33 +00001740 if (crypto_hash_setkey(desc.tfm, ep->secret_key,
1741 sizeof(ep->secret_key)) ||
Herbert Xu1b489e12006-08-20 15:07:14 +10001742 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1743 *error = -SCTP_IERROR_NOMEM;
1744 goto fail;
1745 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
1747 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
Daniel Borkmann570617e2013-02-12 05:15:33 +00001748 *error = -SCTP_IERROR_BAD_SIG;
1749 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 }
1751
1752no_hmac:
1753 /* IG Section 2.35.2:
1754 * 3) Compare the port numbers and the verification tag contained
1755 * within the COOKIE ECHO chunk to the actual port numbers and the
1756 * verification tag within the SCTP common header of the received
1757 * packet. If these values do not match the packet MUST be silently
1758 * discarded,
1759 */
1760 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1761 *error = -SCTP_IERROR_BAD_TAG;
1762 goto fail;
1763 }
1764
Al Viro9b1dfad2006-11-20 17:09:17 -08001765 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1767 *error = -SCTP_IERROR_BAD_PORTS;
1768 goto fail;
1769 }
1770
1771 /* Check to see if the cookie is stale. If there is already
1772 * an association, there is no need to check cookie's expiration
1773 * for init collision case of lost COOKIE ACK.
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001774 * If skb has been timestamped, then use the stamp, otherwise
1775 * use current time. This introduces a small possibility that
1776 * that a cookie may be considered expired, but his would only slow
1777 * down the new association establishment instead of every packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 */
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001779 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
Daniel Borkmann52db8822013-06-25 18:17:27 +02001780 kt = skb_get_ktime(skb);
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001781 else
Daniel Borkmann52db8822013-06-25 18:17:27 +02001782 kt = ktime_get();
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001783
Daniel Borkmann52db8822013-06-25 18:17:27 +02001784 if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 /*
1786 * Section 3.3.10.3 Stale Cookie Error (3)
1787 *
1788 * Cause of error
1789 * ---------------
1790 * Stale Cookie Error: Indicates the receipt of a valid State
1791 * Cookie that has expired.
1792 */
1793 len = ntohs(chunk->chunk_hdr->length);
1794 *errp = sctp_make_op_error_space(asoc, chunk, len);
1795 if (*errp) {
Daniel Borkmann52db8822013-06-25 18:17:27 +02001796 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
Al Viro34bcca22006-11-20 17:27:15 -08001797 __be32 n = htonl(usecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001800 sizeof(n));
1801 sctp_addto_chunk(*errp, sizeof(n), &n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 *error = -SCTP_IERROR_STALE_COOKIE;
1803 } else
1804 *error = -SCTP_IERROR_NOMEM;
1805
1806 goto fail;
1807 }
1808
1809 /* Make a new base association. */
1810 scope = sctp_scope(sctp_source(chunk));
1811 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1812 if (!retval) {
1813 *error = -SCTP_IERROR_NOMEM;
1814 goto fail;
1815 }
1816
1817 /* Set up our peer's port number. */
1818 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1819
1820 /* Populate the association from the cookie. */
1821 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1822
1823 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1824 GFP_ATOMIC) < 0) {
1825 *error = -SCTP_IERROR_NOMEM;
1826 goto fail;
1827 }
1828
1829 /* Also, add the destination address. */
1830 if (list_empty(&retval->base.bind_addr.address_list)) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08001831 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1832 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 }
1834
1835 retval->next_tsn = retval->c.initial_tsn;
1836 retval->ctsn_ack_point = retval->next_tsn - 1;
1837 retval->addip_serial = retval->c.initial_tsn;
1838 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1839 retval->peer.prsctp_capable = retval->c.prsctp_capable;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001840 retval->peer.adaptation_ind = retval->c.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
1842 /* The INIT stuff will be done by the side effects. */
1843 return retval;
1844
1845fail:
1846 if (retval)
1847 sctp_association_free(retval);
1848
1849 return NULL;
1850
1851malformed:
1852 /* Yikes! The packet is either corrupt or deliberately
1853 * malformed.
1854 */
1855 *error = -SCTP_IERROR_MALFORMED;
1856 goto fail;
1857}
1858
1859/********************************************************************
1860 * 3rd Level Abstractions
1861 ********************************************************************/
1862
1863struct __sctp_missing {
Al Viro9f81bcd2006-11-20 17:26:34 -08001864 __be32 num_missing;
1865 __be16 type;
Eric Dumazetbc105022010-06-03 03:21:52 -07001866} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867
1868/*
1869 * Report a missing mandatory parameter.
1870 */
1871static int sctp_process_missing_param(const struct sctp_association *asoc,
1872 sctp_param_t paramtype,
1873 struct sctp_chunk *chunk,
1874 struct sctp_chunk **errp)
1875{
1876 struct __sctp_missing report;
1877 __u16 len;
1878
1879 len = WORD_ROUND(sizeof(report));
1880
1881 /* Make an ERROR chunk, preparing enough room for
1882 * returning multiple unknown parameters.
1883 */
1884 if (!*errp)
1885 *errp = sctp_make_op_error_space(asoc, chunk, len);
1886
1887 if (*errp) {
1888 report.num_missing = htonl(1);
1889 report.type = paramtype;
Vlad Yasevichebdfcad2007-01-15 19:12:31 -08001890 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001891 sizeof(report));
1892 sctp_addto_chunk(*errp, sizeof(report), &report);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 }
1894
1895 /* Stop processing this chunk. */
1896 return 0;
1897}
1898
1899/* Report an Invalid Mandatory Parameter. */
1900static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1901 struct sctp_chunk *chunk,
1902 struct sctp_chunk **errp)
1903{
1904 /* Invalid Mandatory Parameter Error has no payload. */
1905
1906 if (!*errp)
1907 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1908
1909 if (*errp)
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001910 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 /* Stop processing this chunk. */
1913 return 0;
1914}
1915
1916static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1917 struct sctp_paramhdr *param,
1918 const struct sctp_chunk *chunk,
1919 struct sctp_chunk **errp)
1920{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001921 /* This is a fatal error. Any accumulated non-fatal errors are
1922 * not reported.
1923 */
1924 if (*errp)
1925 sctp_chunk_free(*errp);
1926
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 /* Create an error chunk and fill it in with our payload. */
Wei Yongjunba016672008-09-30 05:32:24 -07001928 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929
1930 return 0;
1931}
1932
1933
1934/* Do not attempt to handle the HOST_NAME parm. However, do
1935 * send back an indicator to the peer.
1936 */
1937static int sctp_process_hn_param(const struct sctp_association *asoc,
1938 union sctp_params param,
1939 struct sctp_chunk *chunk,
1940 struct sctp_chunk **errp)
1941{
1942 __u16 len = ntohs(param.p->length);
1943
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001944 /* Processing of the HOST_NAME parameter will generate an
1945 * ABORT. If we've accumulated any non-fatal errors, they
1946 * would be unrecognized parameters and we should not include
1947 * them in the ABORT.
1948 */
1949 if (*errp)
1950 sctp_chunk_free(*errp);
1951
1952 *errp = sctp_make_op_error_space(asoc, chunk, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001954 if (*errp) {
1955 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1956 sctp_addto_chunk(*errp, len, param.v);
1957 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958
1959 /* Stop processing this chunk. */
1960 return 0;
1961}
1962
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00001963static int sctp_verify_ext_param(struct net *net, union sctp_params param)
Vlad Yasevichd6701192007-12-20 14:13:31 -08001964{
1965 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1966 int have_auth = 0;
1967 int have_asconf = 0;
1968 int i;
1969
1970 for (i = 0; i < num_ext; i++) {
1971 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08001972 case SCTP_CID_AUTH:
1973 have_auth = 1;
1974 break;
1975 case SCTP_CID_ASCONF:
1976 case SCTP_CID_ASCONF_ACK:
1977 have_asconf = 1;
1978 break;
Vlad Yasevichd6701192007-12-20 14:13:31 -08001979 }
1980 }
1981
1982 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1983 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1984 * only if ADD-IP is turned on and we are not backward-compatible
1985 * mode.
1986 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001987 if (net->sctp.addip_noauth)
Vlad Yasevichd6701192007-12-20 14:13:31 -08001988 return 1;
1989
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001990 if (net->sctp.addip_enable && !have_auth && have_asconf)
Vlad Yasevichd6701192007-12-20 14:13:31 -08001991 return 0;
1992
1993 return 1;
1994}
1995
Vlad Yasevich131a47e2007-09-16 15:53:56 -07001996static void sctp_process_ext_param(struct sctp_association *asoc,
1997 union sctp_params param)
1998{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00001999 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002000 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2001 int i;
2002
2003 for (i = 0; i < num_ext; i++) {
2004 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08002005 case SCTP_CID_FWD_TSN:
2006 if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable)
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002007 asoc->peer.prsctp_capable = 1;
wangweidongf7010e62013-12-23 12:16:52 +08002008 break;
2009 case SCTP_CID_AUTH:
2010 /* if the peer reports AUTH, assume that he
2011 * supports AUTH.
2012 */
2013 if (net->sctp.auth_enable)
2014 asoc->peer.auth_capable = 1;
2015 break;
2016 case SCTP_CID_ASCONF:
2017 case SCTP_CID_ASCONF_ACK:
2018 if (net->sctp.addip_enable)
2019 asoc->peer.asconf_capable = 1;
2020 break;
2021 default:
2022 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002023 }
2024 }
2025}
2026
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027/* RFC 3.2.1 & the Implementers Guide 2.2.
2028 *
2029 * The Parameter Types are encoded such that the
2030 * highest-order two bits specify the action that must be
2031 * taken if the processing endpoint does not recognize the
2032 * Parameter Type.
2033 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002034 * 00 - Stop processing this parameter; do not process any further
2035 * parameters within this chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002037 * 01 - Stop processing this parameter, do not process any further
2038 * parameters within this chunk, and report the unrecognized
2039 * parameter in an 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 *
2041 * 10 - Skip this parameter and continue processing.
2042 *
2043 * 11 - Skip this parameter and continue processing but
2044 * report the unrecognized parameter in an
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002045 * 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046 *
2047 * Return value:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002048 * SCTP_IERROR_NO_ERROR - continue with the chunk
2049 * SCTP_IERROR_ERROR - stop and report an error.
2050 * SCTP_IERROR_NOMEME - out of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002052static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2053 union sctp_params param,
2054 struct sctp_chunk *chunk,
2055 struct sctp_chunk **errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002057 int retval = SCTP_IERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058
2059 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2060 case SCTP_PARAM_ACTION_DISCARD:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002061 retval = SCTP_IERROR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 break;
2063 case SCTP_PARAM_ACTION_SKIP:
2064 break;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002065 case SCTP_PARAM_ACTION_DISCARD_ERR:
2066 retval = SCTP_IERROR_ERROR;
2067 /* Fall through */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 case SCTP_PARAM_ACTION_SKIP_ERR:
2069 /* Make an ERROR chunk, preparing enough room for
2070 * returning multiple unknown parameters.
2071 */
2072 if (NULL == *errp)
Neil Horman5fa782c2010-04-28 10:30:59 +00002073 *errp = sctp_make_op_error_fixed(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074
2075 if (*errp) {
Jiri Bohac2205a6e2011-02-17 13:12:08 +00002076 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2077 WORD_ROUND(ntohs(param.p->length))))
2078 sctp_addto_chunk_fixed(*errp,
2079 WORD_ROUND(ntohs(param.p->length)),
2080 param.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 } else {
2082 /* If there is no memory for generating the ERROR
2083 * report as specified, an ABORT will be triggered
2084 * to the peer and the association won't be
2085 * established.
2086 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002087 retval = SCTP_IERROR_NOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 break;
2090 default:
2091 break;
2092 }
2093
2094 return retval;
2095}
2096
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002097/* Verify variable length parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 * Return values:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002099 * SCTP_IERROR_ABORT - trigger an ABORT
2100 * SCTP_IERROR_NOMEM - out of memory (abort)
2101 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2102 * SCTP_IERROR_NO_ERROR - continue with the chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 */
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002104static sctp_ierror_t sctp_verify_param(struct net *net,
2105 const struct sctp_association *asoc,
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002106 union sctp_params param,
2107 sctp_cid_t cid,
2108 struct sctp_chunk *chunk,
2109 struct sctp_chunk **err_chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110{
Wei Yongjun72da7b32008-04-12 18:39:19 -07002111 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002112 int retval = SCTP_IERROR_NO_ERROR;
Wei Yongjun72da7b32008-04-12 18:39:19 -07002113 __u16 n_elt, id = 0;
2114 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115
2116 /* FIXME - This routine is not looking at each parameter per the
2117 * chunk type, i.e., unrecognized parameters should be further
2118 * identified based on the chunk id.
2119 */
2120
2121 switch (param.p->type) {
2122 case SCTP_PARAM_IPV4_ADDRESS:
2123 case SCTP_PARAM_IPV6_ADDRESS:
2124 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2125 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2126 case SCTP_PARAM_STATE_COOKIE:
2127 case SCTP_PARAM_HEARTBEAT_INFO:
2128 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2129 case SCTP_PARAM_ECN_CAPABLE:
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002130 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yasevichd6701192007-12-20 14:13:31 -08002131 break;
2132
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002133 case SCTP_PARAM_SUPPORTED_EXT:
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002134 if (!sctp_verify_ext_param(net, param))
Vlad Yasevichd6701192007-12-20 14:13:31 -08002135 return SCTP_IERROR_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 break;
2137
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002138 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002139 if (net->sctp.addip_enable)
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002140 break;
2141 goto fallthrough;
2142
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143 case SCTP_PARAM_HOST_NAME_ADDRESS:
2144 /* Tell the peer, we won't support this param. */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002145 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2146 retval = SCTP_IERROR_ABORT;
2147 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002148
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 case SCTP_PARAM_FWD_TSN_SUPPORT:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002150 if (net->sctp.prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002152 goto fallthrough;
2153
2154 case SCTP_PARAM_RANDOM:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002155 if (!net->sctp.auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002156 goto fallthrough;
2157
2158 /* SCTP-AUTH: Secion 6.1
2159 * If the random number is not 32 byte long the association
2160 * MUST be aborted. The ABORT chunk SHOULD contain the error
2161 * cause 'Protocol Violation'.
2162 */
2163 if (SCTP_AUTH_RANDOM_LENGTH !=
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002164 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2165 sctp_process_inv_paramlength(asoc, param.p,
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002166 chunk, err_chunk);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002167 retval = SCTP_IERROR_ABORT;
2168 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002169 break;
2170
2171 case SCTP_PARAM_CHUNKS:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002172 if (!net->sctp.auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002173 goto fallthrough;
2174
2175 /* SCTP-AUTH: Section 3.2
2176 * The CHUNKS parameter MUST be included once in the INIT or
2177 * INIT-ACK chunk if the sender wants to receive authenticated
2178 * chunks. Its maximum length is 260 bytes.
2179 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002180 if (260 < ntohs(param.p->length)) {
2181 sctp_process_inv_paramlength(asoc, param.p,
2182 chunk, err_chunk);
2183 retval = SCTP_IERROR_ABORT;
2184 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002185 break;
2186
2187 case SCTP_PARAM_HMAC_ALGO:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002188 if (!net->sctp.auth_enable)
Wei Yongjun72da7b32008-04-12 18:39:19 -07002189 goto fallthrough;
2190
2191 hmacs = (struct sctp_hmac_algo_param *)param.p;
2192 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2193
2194 /* SCTP-AUTH: Section 6.1
2195 * The HMAC algorithm based on SHA-1 MUST be supported and
2196 * included in the HMAC-ALGO parameter.
2197 */
2198 for (i = 0; i < n_elt; i++) {
2199 id = ntohs(hmacs->hmac_ids[i]);
2200
2201 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2202 break;
2203 }
2204
2205 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2206 sctp_process_inv_paramlength(asoc, param.p, chunk,
2207 err_chunk);
2208 retval = SCTP_IERROR_ABORT;
2209 }
2210 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002211fallthrough:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212 default:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002213 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2214 __func__, ntohs(param.p->type), cid);
2215
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002216 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 break;
2218 }
2219 return retval;
2220}
2221
2222/* Verify the INIT packet before we process it. */
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002223int sctp_verify_init(struct net *net, const struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 sctp_cid_t cid,
2225 sctp_init_chunk_t *peer_init,
2226 struct sctp_chunk *chunk,
2227 struct sctp_chunk **errp)
2228{
2229 union sctp_params param;
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002230 bool has_cookie = false;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002231 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002233 /* Check for missing mandatory parameters. Note: Initial TSN is
2234 * also mandatory, but is not checked here since the valid range
2235 * is 0..2**32-1. RFC4960, section 3.3.3.
2236 */
2237 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2238 peer_init->init_hdr.num_inbound_streams == 0 ||
2239 peer_init->init_hdr.init_tag == 0 ||
2240 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002241 return sctp_process_inv_mandatory(asoc, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 sctp_walk_params(param, peer_init, init_hdr.params) {
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002244 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2245 has_cookie = true;
2246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247
2248 /* There is a possibility that a parameter length was bad and
2249 * in that case we would have stoped walking the parameters.
2250 * The current param.p would point at the bad one.
2251 * Current consensus on the mailing list is to generate a PROTOCOL
2252 * VIOLATION error. We build the ERROR chunk here and let the normal
2253 * error handling code build and send the packet.
2254 */
wangweidong26ac8e52013-12-23 12:16:51 +08002255 if (param.v != (void *)chunk->chunk_end)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002256 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257
2258 /* The only missing mandatory param possible today is
2259 * the state cookie for an INIT-ACK chunk.
2260 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002261 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2262 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2263 chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002265 /* Verify all the variable length parameters */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 sctp_walk_params(param, peer_init, init_hdr.params) {
2267
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002268 result = sctp_verify_param(net, asoc, param, cid, chunk, errp);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002269 switch (result) {
wangweidongf7010e62013-12-23 12:16:52 +08002270 case SCTP_IERROR_ABORT:
2271 case SCTP_IERROR_NOMEM:
2272 return 0;
2273 case SCTP_IERROR_ERROR:
2274 return 1;
2275 case SCTP_IERROR_NO_ERROR:
2276 default:
2277 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 }
2279
2280 } /* for (loop through all parameters) */
2281
2282 return 1;
2283}
2284
2285/* Unpack the parameters in an INIT packet into an association.
2286 * Returns 0 on failure, else success.
2287 * FIXME: This is an association method.
2288 */
Wei Yongjunde6becd2011-04-19 21:30:51 +00002289int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002291 sctp_init_chunk_t *peer_init, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002293 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 union sctp_params param;
2295 struct sctp_transport *transport;
2296 struct list_head *pos, *temp;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002297 struct sctp_af *af;
2298 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 char *cookie;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002300 int src_match = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301
2302 /* We must include the address that the INIT packet came from.
2303 * This is the only address that matters for an INIT packet.
2304 * When processing a COOKIE ECHO, we retrieve the from address
2305 * of the INIT from the cookie.
2306 */
2307
2308 /* This implementation defaults to making the first transport
2309 * added as the primary transport. The source address seems to
2310 * be a a better choice than any of the embedded addresses.
2311 */
wangweidongcb3f8372013-12-23 12:16:50 +08002312 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
Wei Yongjunde6becd2011-04-19 21:30:51 +00002313 goto nomem;
2314
2315 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2316 src_match = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317
2318 /* Process the initialization parameters. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 sctp_walk_params(param, peer_init, init_hdr.params) {
Wei Yongjunde6becd2011-04-19 21:30:51 +00002320 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2321 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2322 af = sctp_get_af_specific(param_type2af(param.p->type));
2323 af->from_addr_param(&addr, param.addr,
2324 chunk->sctp_hdr->source, 0);
2325 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2326 src_match = 1;
2327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328
2329 if (!sctp_process_param(asoc, param, peer_addr, gfp))
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002330 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 }
2332
Wei Yongjunde6becd2011-04-19 21:30:51 +00002333 /* source address of chunk may not match any valid address */
2334 if (!src_match)
2335 goto clean_up;
2336
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002337 /* AUTH: After processing the parameters, make sure that we
2338 * have all the required info to potentially do authentications.
2339 */
2340 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2341 !asoc->peer.peer_hmacs))
2342 asoc->peer.auth_capable = 0;
2343
Vlad Yasevichd6701192007-12-20 14:13:31 -08002344 /* In a non-backward compatible mode, if the peer claims
2345 * support for ADD-IP but not AUTH, the ADD-IP spec states
2346 * that we MUST ABORT the association. Section 6. The section
2347 * also give us an option to silently ignore the packet, which
2348 * is what we'll do here.
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002349 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002350 if (!net->sctp.addip_noauth &&
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04002351 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002352 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2353 SCTP_PARAM_DEL_IP |
2354 SCTP_PARAM_SET_PRIMARY);
Vlad Yasevich88799fe2007-10-24 17:24:23 -04002355 asoc->peer.asconf_capable = 0;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002356 goto clean_up;
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002357 }
2358
Frank Filz3f7a87d2005-06-20 13:14:57 -07002359 /* Walk list of transports, removing transports in the UNKNOWN state. */
2360 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2361 transport = list_entry(pos, struct sctp_transport, transports);
2362 if (transport->state == SCTP_UNKNOWN) {
2363 sctp_assoc_rm_peer(asoc, transport);
2364 }
2365 }
2366
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 /* The fixed INIT headers are always in network byte
2368 * order.
2369 */
2370 asoc->peer.i.init_tag =
2371 ntohl(peer_init->init_hdr.init_tag);
2372 asoc->peer.i.a_rwnd =
2373 ntohl(peer_init->init_hdr.a_rwnd);
2374 asoc->peer.i.num_outbound_streams =
2375 ntohs(peer_init->init_hdr.num_outbound_streams);
2376 asoc->peer.i.num_inbound_streams =
2377 ntohs(peer_init->init_hdr.num_inbound_streams);
2378 asoc->peer.i.initial_tsn =
2379 ntohl(peer_init->init_hdr.initial_tsn);
2380
2381 /* Apply the upper bounds for output streams based on peer's
2382 * number of inbound streams.
2383 */
2384 if (asoc->c.sinit_num_ostreams >
2385 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2386 asoc->c.sinit_num_ostreams =
2387 ntohs(peer_init->init_hdr.num_inbound_streams);
2388 }
2389
2390 if (asoc->c.sinit_max_instreams >
2391 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2392 asoc->c.sinit_max_instreams =
2393 ntohs(peer_init->init_hdr.num_outbound_streams);
2394 }
2395
2396 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2397 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2398
2399 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2400 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2401
2402 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2403 cookie = asoc->peer.cookie;
2404 if (cookie) {
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02002405 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 if (!asoc->peer.cookie)
2407 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 }
2409
2410 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2411 * high (for example, implementations MAY use the size of the receiver
2412 * advertised window).
2413 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002414 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2415 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416 transport->ssthresh = asoc->peer.i.a_rwnd;
2417 }
2418
2419 /* Set up the TSN tracking pieces. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07002420 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2421 asoc->peer.i.initial_tsn, gfp))
2422 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423
2424 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2425 *
2426 * The stream sequence number in all the streams shall start
2427 * from 0 when the association is established. Also, when the
2428 * stream sequence number reaches the value 65535 the next
2429 * stream sequence number shall be set to 0.
2430 */
2431
Frank Filz3f7a87d2005-06-20 13:14:57 -07002432 /* Allocate storage for the negotiated streams if it is not a temporary
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002433 * association.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434 */
2435 if (!asoc->temp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 int error;
2437
2438 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2439 asoc->c.sinit_num_ostreams, gfp);
2440 if (!asoc->ssnmap)
2441 goto clean_up;
2442
Vlad Yasevich07d93962007-05-04 13:55:27 -07002443 error = sctp_assoc_set_id(asoc, gfp);
2444 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002446 }
2447
2448 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2449 *
2450 * When an endpoint has an ASCONF signaled change to be sent to the
2451 * remote endpoint it should do the following:
2452 * ...
2453 * A2) A serial number should be assigned to the Chunk. The serial
2454 * number should be a monotonically increasing number. All serial
2455 * numbers are defined to be initialized at the start of the
2456 * association to the same value as the Initial TSN.
2457 */
2458 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2459 return 1;
2460
2461clean_up:
2462 /* Release the transport structures. */
2463 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2464 transport = list_entry(pos, struct sctp_transport, transports);
Vlad Yasevichadd52372008-09-18 16:28:27 -07002465 if (transport->state != SCTP_ACTIVE)
2466 sctp_assoc_rm_peer(asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07002468
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469nomem:
2470 return 0;
2471}
2472
2473
2474/* Update asoc with the option described in param.
2475 *
2476 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2477 *
2478 * asoc is the association to update.
2479 * param is the variable length parameter to use for update.
2480 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2481 * If the current packet is an INIT we want to minimize the amount of
2482 * work we do. In particular, we should not build transport
2483 * structures for the addresses.
2484 */
2485static int sctp_process_param(struct sctp_association *asoc,
2486 union sctp_params param,
2487 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002488 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489{
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002490 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 union sctp_addr addr;
2492 int i;
2493 __u16 sat;
2494 int retval = 1;
2495 sctp_scope_t scope;
2496 time_t stale;
2497 struct sctp_af *af;
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002498 union sctp_addr_param *addr_param;
2499 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500
2501 /* We maintain all INIT parameters in network byte order all the
2502 * time. This allows us to not worry about whether the parameters
2503 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2504 */
2505 switch (param.p->type) {
2506 case SCTP_PARAM_IPV6_ADDRESS:
2507 if (PF_INET6 != asoc->base.sk->sk_family)
2508 break;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002509 goto do_addr_param;
2510
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 case SCTP_PARAM_IPV4_ADDRESS:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002512 /* v4 addresses are not allowed on v6-only socket */
2513 if (ipv6_only_sock(asoc->base.sk))
2514 break;
2515do_addr_param:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516 af = sctp_get_af_specific(param_type2af(param.p->type));
Al Virodd86d132006-11-20 17:11:13 -08002517 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 scope = sctp_scope(peer_addr);
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002519 if (sctp_in_scope(net, &addr, scope))
Al Virodd86d132006-11-20 17:11:13 -08002520 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 return 0;
2522 break;
2523
2524 case SCTP_PARAM_COOKIE_PRESERVATIVE:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002525 if (!net->sctp.cookie_preserve_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 break;
2527
2528 stale = ntohl(param.life->lifespan_increment);
2529
2530 /* Suggested Cookie Life span increment's unit is msec,
2531 * (1/1000sec).
2532 */
Daniel Borkmann52db8822013-06-25 18:17:27 +02002533 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534 break;
2535
2536 case SCTP_PARAM_HOST_NAME_ADDRESS:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002537 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 break;
2539
2540 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2541 /* Turn off the default values first so we'll know which
2542 * ones are really set by the peer.
2543 */
2544 asoc->peer.ipv4_address = 0;
2545 asoc->peer.ipv6_address = 0;
2546
Gui Jianfeng140ee962008-03-05 13:43:32 -08002547 /* Assume that peer supports the address family
2548 * by which it sends a packet.
2549 */
2550 if (peer_addr->sa.sa_family == AF_INET6)
2551 asoc->peer.ipv6_address = 1;
2552 else if (peer_addr->sa.sa_family == AF_INET)
2553 asoc->peer.ipv4_address = 1;
2554
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555 /* Cycle through address types; avoid divide by 0. */
2556 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2557 if (sat)
2558 sat /= sizeof(__u16);
2559
2560 for (i = 0; i < sat; ++i) {
2561 switch (param.sat->types[i]) {
2562 case SCTP_PARAM_IPV4_ADDRESS:
2563 asoc->peer.ipv4_address = 1;
2564 break;
2565
2566 case SCTP_PARAM_IPV6_ADDRESS:
Wei Yongjun6e40a912008-05-09 15:11:17 -07002567 if (PF_INET6 == asoc->base.sk->sk_family)
2568 asoc->peer.ipv6_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 break;
2570
2571 case SCTP_PARAM_HOST_NAME_ADDRESS:
2572 asoc->peer.hostname_address = 1;
2573 break;
2574
2575 default: /* Just ignore anything else. */
2576 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002578 }
2579 break;
2580
2581 case SCTP_PARAM_STATE_COOKIE:
2582 asoc->peer.cookie_len =
2583 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2584 asoc->peer.cookie = param.cookie->body;
2585 break;
2586
2587 case SCTP_PARAM_HEARTBEAT_INFO:
2588 /* Would be odd to receive, but it causes no problems. */
2589 break;
2590
2591 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2592 /* Rejected during verify stage. */
2593 break;
2594
2595 case SCTP_PARAM_ECN_CAPABLE:
2596 asoc->peer.ecn_capable = 1;
2597 break;
2598
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002599 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yaseviche69c4e02008-09-15 16:29:49 -04002600 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 break;
2602
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002603 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002604 if (!net->sctp.addip_enable)
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07002605 goto fall_through;
2606
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002607 addr_param = param.v + sizeof(sctp_addip_param_t);
2608
2609 af = sctp_get_af_specific(param_type2af(param.p->type));
2610 af->from_addr_param(&addr, addr_param,
2611 htons(asoc->peer.port), 0);
2612
2613 /* if the address is invalid, we can't process it.
2614 * XXX: see spec for what to do.
2615 */
2616 if (!af->addr_valid(&addr, NULL, NULL))
2617 break;
2618
2619 t = sctp_assoc_lookup_paddr(asoc, &addr);
2620 if (!t)
2621 break;
2622
2623 sctp_assoc_set_primary(asoc, t);
2624 break;
2625
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002626 case SCTP_PARAM_SUPPORTED_EXT:
2627 sctp_process_ext_param(asoc, param);
2628 break;
2629
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 case SCTP_PARAM_FWD_TSN_SUPPORT:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002631 if (net->sctp.prsctp_enable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632 asoc->peer.prsctp_capable = 1;
2633 break;
2634 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002635 /* Fall Through */
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002636 goto fall_through;
2637
2638 case SCTP_PARAM_RANDOM:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002639 if (!net->sctp.auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002640 goto fall_through;
2641
2642 /* Save peer's random parameter */
2643 asoc->peer.peer_random = kmemdup(param.p,
2644 ntohs(param.p->length), gfp);
2645 if (!asoc->peer.peer_random) {
2646 retval = 0;
2647 break;
2648 }
2649 break;
2650
2651 case SCTP_PARAM_HMAC_ALGO:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002652 if (!net->sctp.auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002653 goto fall_through;
2654
2655 /* Save peer's HMAC list */
2656 asoc->peer.peer_hmacs = kmemdup(param.p,
2657 ntohs(param.p->length), gfp);
2658 if (!asoc->peer.peer_hmacs) {
2659 retval = 0;
2660 break;
2661 }
2662
2663 /* Set the default HMAC the peer requested*/
2664 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2665 break;
2666
2667 case SCTP_PARAM_CHUNKS:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002668 if (!net->sctp.auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002669 goto fall_through;
2670
2671 asoc->peer.peer_chunks = kmemdup(param.p,
2672 ntohs(param.p->length), gfp);
2673 if (!asoc->peer.peer_chunks)
2674 retval = 0;
2675 break;
2676fall_through:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677 default:
2678 /* Any unrecognized parameters should have been caught
2679 * and handled by sctp_verify_param() which should be
2680 * called prior to this routine. Simply log the error
2681 * here.
2682 */
Daniel Borkmannbb333812013-06-28 19:49:40 +02002683 pr_debug("%s: ignoring param:%d for association:%p.\n",
2684 __func__, ntohs(param.p->type), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002686 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687
2688 return retval;
2689}
2690
2691/* Select a new verification tag. */
2692__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2693{
2694 /* I believe that this random number generator complies with RFC1750.
2695 * A tag of 0 is reserved for special cases (e.g. INIT).
2696 */
2697 __u32 x;
2698
2699 do {
2700 get_random_bytes(&x, sizeof(__u32));
2701 } while (x == 0);
2702
2703 return x;
2704}
2705
2706/* Select an initial TSN to send during startup. */
2707__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2708{
2709 __u32 retval;
2710
2711 get_random_bytes(&retval, sizeof(__u32));
2712 return retval;
2713}
2714
2715/*
2716 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2717 * 0 1 2 3
2718 * 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
2719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2720 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2722 * | Serial Number |
2723 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2724 * | Address Parameter |
2725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2726 * | ASCONF Parameter #1 |
2727 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2728 * \ \
2729 * / .... /
2730 * \ \
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2732 * | ASCONF Parameter #N |
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002735 * Address Parameter and other parameter will not be wrapped in this function
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 */
2737static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2738 union sctp_addr *addr,
2739 int vparam_len)
2740{
2741 sctp_addiphdr_t asconf;
2742 struct sctp_chunk *retval;
2743 int length = sizeof(asconf) + vparam_len;
2744 union sctp_addr_param addrparam;
2745 int addrlen;
2746 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2747
2748 addrlen = af->to_addr_param(addr, &addrparam);
2749 if (!addrlen)
2750 return NULL;
2751 length += addrlen;
2752
2753 /* Create the chunk. */
Vlad Yasevich072017b2013-08-09 22:05:36 -04002754 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755 if (!retval)
2756 return NULL;
2757
2758 asconf.serial = htonl(asoc->addip_serial++);
2759
2760 retval->subh.addip_hdr =
2761 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2762 retval->param_hdr.v =
2763 sctp_addto_chunk(retval, addrlen, &addrparam);
2764
2765 return retval;
2766}
2767
2768/* ADDIP
2769 * 3.2.1 Add IP Address
2770 * 0 1 2 3
2771 * 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
2772 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2773 * | Type = 0xC001 | Length = Variable |
2774 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2775 * | ASCONF-Request Correlation ID |
2776 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2777 * | Address Parameter |
2778 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2779 *
2780 * 3.2.2 Delete IP Address
2781 * 0 1 2 3
2782 * 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
2783 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2784 * | Type = 0xC002 | Length = Variable |
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | ASCONF-Request Correlation ID |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | Address Parameter |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2790 *
2791 */
2792struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2793 union sctp_addr *laddr,
2794 struct sockaddr *addrs,
2795 int addrcnt,
Al Virodbc16db2006-11-20 17:01:42 -08002796 __be16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797{
2798 sctp_addip_param_t param;
2799 struct sctp_chunk *retval;
2800 union sctp_addr_param addr_param;
2801 union sctp_addr *addr;
2802 void *addr_buf;
2803 struct sctp_af *af;
2804 int paramlen = sizeof(param);
2805 int addr_param_len = 0;
2806 int totallen = 0;
2807 int i;
Michio Honda8a07eb02011-04-26 20:19:36 +09002808 int del_pickup = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809
2810 /* Get total length of all the address parameters. */
2811 addr_buf = addrs;
2812 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002813 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814 af = sctp_get_af_specific(addr->v4.sin_family);
2815 addr_param_len = af->to_addr_param(addr, &addr_param);
2816
2817 totallen += paramlen;
2818 totallen += addr_param_len;
2819
2820 addr_buf += af->sockaddr_len;
Michio Honda8a07eb02011-04-26 20:19:36 +09002821 if (asoc->asconf_addr_del_pending && !del_pickup) {
2822 /* reuse the parameter length from the same scope one */
2823 totallen += paramlen;
2824 totallen += addr_param_len;
2825 del_pickup = 1;
Daniel Borkmannbb333812013-06-28 19:49:40 +02002826
2827 pr_debug("%s: picked same-scope del_pending addr, "
2828 "totallen for all addresses is %d\n",
2829 __func__, totallen);
Michio Honda8a07eb02011-04-26 20:19:36 +09002830 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002831 }
2832
2833 /* Create an asconf chunk with the required length. */
2834 retval = sctp_make_asconf(asoc, laddr, totallen);
2835 if (!retval)
2836 return NULL;
2837
2838 /* Add the address parameters to the asconf chunk. */
2839 addr_buf = addrs;
2840 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002841 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 af = sctp_get_af_specific(addr->v4.sin_family);
2843 addr_param_len = af->to_addr_param(addr, &addr_param);
2844 param.param_hdr.type = flags;
2845 param.param_hdr.length = htons(paramlen + addr_param_len);
2846 param.crr_id = i;
2847
2848 sctp_addto_chunk(retval, paramlen, &param);
2849 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2850
2851 addr_buf += af->sockaddr_len;
2852 }
Michio Honda8a07eb02011-04-26 20:19:36 +09002853 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2854 addr = asoc->asconf_addr_del_pending;
2855 af = sctp_get_af_specific(addr->v4.sin_family);
2856 addr_param_len = af->to_addr_param(addr, &addr_param);
2857 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2858 param.param_hdr.length = htons(paramlen + addr_param_len);
2859 param.crr_id = i;
2860
2861 sctp_addto_chunk(retval, paramlen, &param);
2862 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2863 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864 return retval;
2865}
2866
2867/* ADDIP
2868 * 3.2.4 Set Primary IP Address
2869 * 0 1 2 3
2870 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2871 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2872 * | Type =0xC004 | Length = Variable |
2873 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2874 * | ASCONF-Request Correlation ID |
2875 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2876 * | Address Parameter |
2877 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2878 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002879 * Create an ASCONF chunk with Set Primary IP address parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880 */
2881struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2882 union sctp_addr *addr)
2883{
2884 sctp_addip_param_t param;
2885 struct sctp_chunk *retval;
2886 int len = sizeof(param);
2887 union sctp_addr_param addrparam;
2888 int addrlen;
2889 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2890
2891 addrlen = af->to_addr_param(addr, &addrparam);
2892 if (!addrlen)
2893 return NULL;
2894 len += addrlen;
2895
2896 /* Create the chunk and make asconf header. */
2897 retval = sctp_make_asconf(asoc, addr, len);
2898 if (!retval)
2899 return NULL;
2900
2901 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2902 param.param_hdr.length = htons(len);
2903 param.crr_id = 0;
2904
2905 sctp_addto_chunk(retval, sizeof(param), &param);
2906 sctp_addto_chunk(retval, addrlen, &addrparam);
2907
2908 return retval;
2909}
2910
2911/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2912 * 0 1 2 3
2913 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | Type = 0x80 | Chunk Flags | Chunk Length |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2917 * | Serial Number |
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2919 * | ASCONF Parameter Response#1 |
2920 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2921 * \ \
2922 * / .... /
2923 * \ \
2924 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2925 * | ASCONF Parameter Response#N |
2926 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2927 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002928 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 */
2930static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2931 __u32 serial, int vparam_len)
2932{
2933 sctp_addiphdr_t asconf;
2934 struct sctp_chunk *retval;
2935 int length = sizeof(asconf) + vparam_len;
2936
2937 /* Create the chunk. */
Vlad Yasevich072017b2013-08-09 22:05:36 -04002938 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 if (!retval)
2940 return NULL;
2941
2942 asconf.serial = htonl(serial);
2943
2944 retval->subh.addip_hdr =
2945 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2946
2947 return retval;
2948}
2949
2950/* Add response parameters to an ASCONF_ACK chunk. */
Al Viro9f81bcd2006-11-20 17:26:34 -08002951static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
Al Virodbc16db2006-11-20 17:01:42 -08002952 __be16 err_code, sctp_addip_param_t *asconf_param)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002953{
2954 sctp_addip_param_t ack_param;
2955 sctp_errhdr_t err_param;
2956 int asconf_param_len = 0;
2957 int err_param_len = 0;
Al Virodbc16db2006-11-20 17:01:42 -08002958 __be16 response_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959
2960 if (SCTP_ERROR_NO_ERROR == err_code) {
2961 response_type = SCTP_PARAM_SUCCESS_REPORT;
2962 } else {
2963 response_type = SCTP_PARAM_ERR_CAUSE;
2964 err_param_len = sizeof(err_param);
2965 if (asconf_param)
2966 asconf_param_len =
2967 ntohs(asconf_param->param_hdr.length);
2968 }
2969
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002970 /* Add Success Indication or Error Cause Indication parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 ack_param.param_hdr.type = response_type;
2972 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2973 err_param_len +
2974 asconf_param_len);
2975 ack_param.crr_id = crr_id;
2976 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2977
2978 if (SCTP_ERROR_NO_ERROR == err_code)
2979 return;
2980
2981 /* Add Error Cause parameter. */
2982 err_param.cause = err_code;
2983 err_param.length = htons(err_param_len + asconf_param_len);
2984 sctp_addto_chunk(chunk, err_param_len, &err_param);
2985
2986 /* Add the failed TLV copied from ASCONF chunk. */
2987 if (asconf_param)
2988 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2989}
2990
2991/* Process a asconf parameter. */
Al Virodbc16db2006-11-20 17:01:42 -08002992static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 struct sctp_chunk *asconf,
2994 sctp_addip_param_t *asconf_param)
2995{
2996 struct sctp_transport *peer;
2997 struct sctp_af *af;
2998 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999 union sctp_addr_param *addr_param;
Al Viro5f242a12006-11-20 17:05:23 -08003000
Joe Perchesea110732011-06-13 16:21:26 +00003001 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Patrick McHardyc1cc6782008-05-13 23:25:00 -07003002
Wei Yongjun44e65c12009-06-16 14:48:24 +08003003 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3004 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3005 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3006 return SCTP_ERROR_UNKNOWN_PARAM;
3007
Shan Wei6a435732011-04-18 19:11:47 +00003008 switch (addr_param->p.type) {
Wei Yongjunc4492582008-05-09 15:11:53 -07003009 case SCTP_PARAM_IPV6_ADDRESS:
3010 if (!asoc->peer.ipv6_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003011 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003012 break;
3013 case SCTP_PARAM_IPV4_ADDRESS:
3014 if (!asoc->peer.ipv4_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003015 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003016 break;
3017 default:
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003018 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003019 }
3020
Shan Wei6a435732011-04-18 19:11:47 +00003021 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022 if (unlikely(!af))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003023 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024
Al Virodd86d132006-11-20 17:11:13 -08003025 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003026
3027 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3028 * or multicast address.
3029 * (note: wildcard is permitted and requires special handling so
3030 * make sure we check for that)
3031 */
3032 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003033 return SCTP_ERROR_DNS_FAILED;
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003034
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035 switch (asconf_param->param_hdr.type) {
3036 case SCTP_PARAM_ADD_IP:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003037 /* Section 4.2.1:
3038 * If the address 0.0.0.0 or ::0 is provided, the source
3039 * address of the packet MUST be added.
3040 */
3041 if (af->is_any(&addr))
3042 memcpy(&addr, &asconf->source, sizeof(addr));
3043
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003045 * request and does not have the local resources to add this
3046 * new address to the association, it MUST return an Error
3047 * Cause TLV set to the new error code 'Operation Refused
3048 * Due to Resource Shortage'.
3049 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003050
Al Virodd86d132006-11-20 17:11:13 -08003051 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052 if (!peer)
3053 return SCTP_ERROR_RSRC_LOW;
3054
3055 /* Start the heartbeat timer. */
3056 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3057 sctp_transport_hold(peer);
Michio Honda6af29cc2011-06-16 17:14:34 +09003058 asoc->new_transport = peer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 break;
3060 case SCTP_PARAM_DEL_IP:
3061 /* ADDIP 4.3 D7) If a request is received to delete the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003062 * last remaining IP address of a peer endpoint, the receiver
3063 * MUST send an Error Cause TLV with the error cause set to the
3064 * new error code 'Request to Delete Last Remaining IP Address'.
3065 */
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003066 if (asoc->peer.transport_count == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 return SCTP_ERROR_DEL_LAST_IP;
3068
3069 /* ADDIP 4.3 D8) If a request is received to delete an IP
3070 * address which is also the source address of the IP packet
3071 * which contained the ASCONF chunk, the receiver MUST reject
3072 * this request. To reject the request the receiver MUST send
3073 * an Error Cause TLV set to the new error code 'Request to
3074 * Delete Source IP Address'
3075 */
Michio Hondab1364102011-04-26 17:37:02 +09003076 if (sctp_cmp_addr_exact(&asconf->source, &addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003077 return SCTP_ERROR_DEL_SRC_IP;
3078
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003079 /* Section 4.2.2
3080 * If the address 0.0.0.0 or ::0 is provided, all
3081 * addresses of the peer except the source address of the
3082 * packet MUST be deleted.
3083 */
3084 if (af->is_any(&addr)) {
3085 sctp_assoc_set_primary(asoc, asconf->transport);
3086 sctp_assoc_del_nonprimary_peers(asoc,
3087 asconf->transport);
3088 } else
3089 sctp_assoc_del_peer(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 break;
3091 case SCTP_PARAM_SET_PRIMARY:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003092 /* ADDIP Section 4.2.4
3093 * If the address 0.0.0.0 or ::0 is provided, the receiver
3094 * MAY mark the source address of the packet as its
3095 * primary.
3096 */
3097 if (af->is_any(&addr))
3098 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3099
Al Virodd86d132006-11-20 17:11:13 -08003100 peer = sctp_assoc_lookup_paddr(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101 if (!peer)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003102 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103
3104 sctp_assoc_set_primary(asoc, peer);
3105 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106 }
3107
3108 return SCTP_ERROR_NO_ERROR;
3109}
3110
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003111/* Verify the ASCONF packet before we process it. */
3112int sctp_verify_asconf(const struct sctp_association *asoc,
3113 struct sctp_paramhdr *param_hdr, void *chunk_end,
3114 struct sctp_paramhdr **errp) {
3115 sctp_addip_param_t *asconf_param;
3116 union sctp_params param;
3117 int length, plen;
3118
3119 param.v = (sctp_paramhdr_t *) param_hdr;
3120 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3121 length = ntohs(param.p->length);
3122 *errp = param.p;
3123
3124 if (param.v > chunk_end - length ||
3125 length < sizeof(sctp_paramhdr_t))
3126 return 0;
3127
3128 switch (param.p->type) {
3129 case SCTP_PARAM_ADD_IP:
3130 case SCTP_PARAM_DEL_IP:
3131 case SCTP_PARAM_SET_PRIMARY:
3132 asconf_param = (sctp_addip_param_t *)param.v;
3133 plen = ntohs(asconf_param->param_hdr.length);
3134 if (plen < sizeof(sctp_addip_param_t) +
3135 sizeof(sctp_paramhdr_t))
3136 return 0;
3137 break;
3138 case SCTP_PARAM_SUCCESS_REPORT:
3139 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3140 if (length != sizeof(sctp_addip_param_t))
3141 return 0;
3142
3143 break;
3144 default:
3145 break;
3146 }
3147
3148 param.v += WORD_ROUND(length);
3149 }
3150
3151 if (param.v != chunk_end)
3152 return 0;
3153
3154 return 1;
3155}
3156
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003157/* Process an incoming ASCONF chunk with the next expected serial no. and
Linus Torvalds1da177e2005-04-16 15:20:36 -07003158 * return an ASCONF_ACK chunk to be sent in response.
3159 */
3160struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3161 struct sctp_chunk *asconf)
3162{
3163 sctp_addiphdr_t *hdr;
3164 union sctp_addr_param *addr_param;
3165 sctp_addip_param_t *asconf_param;
3166 struct sctp_chunk *asconf_ack;
3167
Al Virodbc16db2006-11-20 17:01:42 -08003168 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003169 int length = 0;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003170 int chunk_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003171 __u32 serial;
3172 int all_param_pass = 1;
3173
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003174 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003175 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3176 serial = ntohl(hdr->serial);
3177
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003178 /* Skip the addiphdr and store a pointer to address parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003179 length = sizeof(sctp_addiphdr_t);
3180 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3181 chunk_len -= length;
3182
3183 /* Skip the address parameter and store a pointer to the first
Joe Perches7aa1b542007-12-20 14:03:52 -08003184 * asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003185 */
Shan Wei6a435732011-04-18 19:11:47 +00003186 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003187 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003188 chunk_len -= length;
3189
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003190 /* create an ASCONF_ACK chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003191 * Based on the definitions of parameters, we know that the size of
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003192 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
Joe Perches7aa1b542007-12-20 14:03:52 -08003193 * parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194 */
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003195 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003196 if (!asconf_ack)
3197 goto done;
3198
3199 /* Process the TLVs contained within the ASCONF chunk. */
3200 while (chunk_len > 0) {
3201 err_code = sctp_process_asconf_param(asoc, asconf,
3202 asconf_param);
3203 /* ADDIP 4.1 A7)
3204 * If an error response is received for a TLV parameter,
3205 * all TLVs with no response before the failed TLV are
3206 * considered successful if not reported. All TLVs after
3207 * the failed response are considered unsuccessful unless
3208 * a specific success indication is present for the parameter.
3209 */
3210 if (SCTP_ERROR_NO_ERROR != err_code)
3211 all_param_pass = 0;
3212
3213 if (!all_param_pass)
3214 sctp_add_asconf_response(asconf_ack,
3215 asconf_param->crr_id, err_code,
3216 asconf_param);
3217
3218 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3219 * an IP address sends an 'Out of Resource' in its response, it
3220 * MUST also fail any subsequent add or delete requests bundled
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003221 * in the ASCONF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003222 */
3223 if (SCTP_ERROR_RSRC_LOW == err_code)
3224 goto done;
3225
3226 /* Move to the next ASCONF param. */
3227 length = ntohs(asconf_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003228 asconf_param = (void *)asconf_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003229 chunk_len -= length;
3230 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003231
Linus Torvalds1da177e2005-04-16 15:20:36 -07003232done:
3233 asoc->peer.addip_serial++;
3234
3235 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003236 * after freeing the reference to old asconf ack if any.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237 */
3238 if (asconf_ack) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003239 sctp_chunk_hold(asconf_ack);
Vlad Yasevicha08de642007-12-20 14:11:47 -08003240 list_add_tail(&asconf_ack->transmitted_list,
3241 &asoc->asconf_ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242 }
3243
3244 return asconf_ack;
3245}
3246
3247/* Process a asconf parameter that is successfully acked. */
Wei Yongjun425e0f62009-06-16 14:47:30 +08003248static void sctp_asconf_param_success(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 sctp_addip_param_t *asconf_param)
3250{
3251 struct sctp_af *af;
3252 union sctp_addr addr;
3253 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3254 union sctp_addr_param *addr_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255 struct sctp_transport *transport;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003256 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003257
Joe Perchesea110732011-06-13 16:21:26 +00003258 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003259
3260 /* We have checked the packet before, so we do not check again. */
Shan Wei6a435732011-04-18 19:11:47 +00003261 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Al Virodd86d132006-11-20 17:11:13 -08003262 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003263
3264 switch (asconf_param->param_hdr.type) {
3265 case SCTP_PARAM_ADD_IP:
Vlad Yasevich559cf712007-09-16 16:03:28 -07003266 /* This is always done in BH context with a socket lock
3267 * held, so the list can not change.
3268 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003269 local_bh_disable();
Vlad Yasevich559cf712007-09-16 16:03:28 -07003270 list_for_each_entry(saddr, &bp->address_list, list) {
Al Virodd86d132006-11-20 17:11:13 -08003271 if (sctp_cmp_addr_exact(&saddr->a, &addr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08003272 saddr->state = SCTP_ADDR_SRC;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003273 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003274 local_bh_enable();
Wei Yongjun3cd97492009-06-16 10:07:23 +08003275 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3276 transports) {
Wei Yongjun3cd97492009-06-16 10:07:23 +08003277 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003278 transport->dst = NULL;
Wei Yongjun3cd97492009-06-16 10:07:23 +08003279 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003280 break;
3281 case SCTP_PARAM_DEL_IP:
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003282 local_bh_disable();
Wei Yongjun425e0f62009-06-16 14:47:30 +08003283 sctp_del_bind_addr(bp, &addr);
Michio Honda8a07eb02011-04-26 20:19:36 +09003284 if (asoc->asconf_addr_del_pending != NULL &&
3285 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3286 kfree(asoc->asconf_addr_del_pending);
3287 asoc->asconf_addr_del_pending = NULL;
3288 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003289 local_bh_enable();
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07003290 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3291 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003292 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003293 transport->dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003294 }
3295 break;
3296 default:
3297 break;
3298 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003299}
3300
3301/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3302 * for the given asconf parameter. If there is no response for this parameter,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003303 * return the error code based on the third argument 'no_err'.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003304 * ADDIP 4.1
3305 * A7) If an error response is received for a TLV parameter, all TLVs with no
3306 * response before the failed TLV are considered successful if not reported.
3307 * All TLVs after the failed response are considered unsuccessful unless a
3308 * specific success indication is present for the parameter.
3309 */
Al Virodbc16db2006-11-20 17:01:42 -08003310static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003311 sctp_addip_param_t *asconf_param,
3312 int no_err)
3313{
3314 sctp_addip_param_t *asconf_ack_param;
3315 sctp_errhdr_t *err_param;
3316 int length;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003317 int asconf_ack_len;
Al Virodbc16db2006-11-20 17:01:42 -08003318 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003319
3320 if (no_err)
3321 err_code = SCTP_ERROR_NO_ERROR;
3322 else
3323 err_code = SCTP_ERROR_REQ_REFUSED;
3324
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003325 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3326 sizeof(sctp_chunkhdr_t);
3327
Linus Torvalds1da177e2005-04-16 15:20:36 -07003328 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3329 * the first asconf_ack parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003330 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003331 length = sizeof(sctp_addiphdr_t);
3332 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3333 length);
3334 asconf_ack_len -= length;
3335
3336 while (asconf_ack_len > 0) {
3337 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
wangweidongcb3f8372013-12-23 12:16:50 +08003338 switch (asconf_ack_param->param_hdr.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003339 case SCTP_PARAM_SUCCESS_REPORT:
3340 return SCTP_ERROR_NO_ERROR;
3341 case SCTP_PARAM_ERR_CAUSE:
3342 length = sizeof(sctp_addip_param_t);
Joe Perchesea110732011-06-13 16:21:26 +00003343 err_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344 asconf_ack_len -= length;
3345 if (asconf_ack_len > 0)
3346 return err_param->cause;
3347 else
3348 return SCTP_ERROR_INV_PARAM;
3349 break;
3350 default:
3351 return SCTP_ERROR_INV_PARAM;
3352 }
3353 }
3354
3355 length = ntohs(asconf_ack_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003356 asconf_ack_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357 asconf_ack_len -= length;
3358 }
3359
3360 return err_code;
3361}
3362
3363/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3364int sctp_process_asconf_ack(struct sctp_association *asoc,
3365 struct sctp_chunk *asconf_ack)
3366{
3367 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3368 union sctp_addr_param *addr_param;
3369 sctp_addip_param_t *asconf_param;
3370 int length = 0;
3371 int asconf_len = asconf->skb->len;
3372 int all_param_pass = 0;
3373 int no_err = 1;
3374 int retval = 0;
Al Virodbc16db2006-11-20 17:01:42 -08003375 __be16 err_code = SCTP_ERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003376
3377 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3378 * a pointer to address parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003379 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003380 length = sizeof(sctp_addip_chunk_t);
3381 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3382 asconf_len -= length;
3383
3384 /* Skip the address parameter in the last asconf sent and store a
Joe Perches7aa1b542007-12-20 14:03:52 -08003385 * pointer to the first asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003386 */
Shan Wei6a435732011-04-18 19:11:47 +00003387 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003388 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003389 asconf_len -= length;
3390
3391 /* ADDIP 4.1
3392 * A8) If there is no response(s) to specific TLV parameter(s), and no
3393 * failures are indicated, then all request(s) are considered
3394 * successful.
3395 */
3396 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3397 all_param_pass = 1;
3398
3399 /* Process the TLVs contained in the last sent ASCONF chunk. */
3400 while (asconf_len > 0) {
3401 if (all_param_pass)
3402 err_code = SCTP_ERROR_NO_ERROR;
3403 else {
3404 err_code = sctp_get_asconf_response(asconf_ack,
3405 asconf_param,
3406 no_err);
3407 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3408 no_err = 0;
3409 }
3410
3411 switch (err_code) {
3412 case SCTP_ERROR_NO_ERROR:
Wei Yongjun425e0f62009-06-16 14:47:30 +08003413 sctp_asconf_param_success(asoc, asconf_param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003414 break;
3415
3416 case SCTP_ERROR_RSRC_LOW:
3417 retval = 1;
3418 break;
3419
Wei Yongjuna987f762009-04-07 15:44:29 +08003420 case SCTP_ERROR_UNKNOWN_PARAM:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003421 /* Disable sending this type of asconf parameter in
3422 * future.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003423 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003424 asoc->peer.addip_disabled_mask |=
3425 asconf_param->param_hdr.type;
3426 break;
3427
3428 case SCTP_ERROR_REQ_REFUSED:
3429 case SCTP_ERROR_DEL_LAST_IP:
3430 case SCTP_ERROR_DEL_SRC_IP:
3431 default:
3432 break;
3433 }
3434
3435 /* Skip the processed asconf parameter and move to the next
3436 * one.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003437 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003438 length = ntohs(asconf_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003439 asconf_param = (void *)asconf_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003440 asconf_len -= length;
3441 }
3442
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003443 if (no_err && asoc->src_out_of_asoc_ok) {
Michio Honda8a07eb02011-04-26 20:19:36 +09003444 asoc->src_out_of_asoc_ok = 0;
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003445 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3446 }
Michio Honda8a07eb02011-04-26 20:19:36 +09003447
Linus Torvalds1da177e2005-04-16 15:20:36 -07003448 /* Free the cached last sent asconf chunk. */
Vlad Yasevich5f9646c2008-02-05 14:23:44 -05003449 list_del_init(&asconf->transmitted_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003450 sctp_chunk_free(asconf);
3451 asoc->addip_last_asconf = NULL;
3452
Linus Torvalds1da177e2005-04-16 15:20:36 -07003453 return retval;
3454}
3455
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003456/* Make a FWD TSN chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3458 __u32 new_cum_tsn, size_t nstreams,
3459 struct sctp_fwdtsn_skip *skiplist)
3460{
3461 struct sctp_chunk *retval = NULL;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003462 struct sctp_fwdtsn_hdr ftsn_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003463 struct sctp_fwdtsn_skip skip;
3464 size_t hint;
3465 int i;
3466
3467 hint = (nstreams + 1) * sizeof(__u32);
3468
Vlad Yasevich072017b2013-08-09 22:05:36 -04003469 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003470
3471 if (!retval)
3472 return NULL;
3473
Linus Torvalds1da177e2005-04-16 15:20:36 -07003474 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3475 retval->subh.fwdtsn_hdr =
3476 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3477
3478 for (i = 0; i < nstreams; i++) {
3479 skip.stream = skiplist[i].stream;
3480 skip.ssn = skiplist[i].ssn;
3481 sctp_addto_chunk(retval, sizeof(skip), &skip);
3482 }
3483
3484 return retval;
3485}