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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
Herbert Xu5821c762016-01-24 21:20:12 +080048#include <crypto/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/types.h>
50#include <linux/kernel.h>
51#include <linux/ip.h>
52#include <linux/ipv6.h>
53#include <linux/net.h>
54#include <linux/inet.h>
Christian Borntraegerebc3bbc2007-10-23 12:46:32 +020055#include <linux/scatterlist.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,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -030065 __u8 type, __u8 flags, int paylen,
66 gfp_t gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -040067static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -030068 __u8 flags, int paylen, gfp_t gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -040069static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -030070 __u8 type, __u8 flags, int paylen,
71 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
73 const struct sctp_association *asoc,
74 const struct sctp_chunk *init_chunk,
75 int *cookie_len,
76 const __u8 *raw_addrs, int addrs_len);
77static int sctp_process_param(struct sctp_association *asoc,
78 union sctp_params param,
79 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +010080 gfp_t gfp);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -050081static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
82 const void *data);
stephen hemminger6daaf0d2014-01-09 22:31:11 -080083static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
84 const void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Vlad Yasevich072017b2013-08-09 22:05:36 -040086/* Control chunk destructor */
87static void sctp_control_release_owner(struct sk_buff *skb)
88{
89 /*TODO: do memory release */
90}
91
92static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
93{
94 struct sctp_association *asoc = chunk->asoc;
95 struct sk_buff *skb = chunk->skb;
96
97 /* TODO: properly account for control chunks.
98 * To do it right we'll need:
99 * 1) endpoint if association isn't known.
100 * 2) proper memory accounting.
101 *
102 * For now don't do anything for now.
103 */
104 skb->sk = asoc ? asoc->base.sk : NULL;
105 skb->destructor = sctp_control_release_owner;
106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108/* What was the inbound interface for this chunk? */
109int sctp_chunk_iif(const struct sctp_chunk *chunk)
110{
111 struct sctp_af *af;
112 int iif = 0;
113
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700114 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 if (af)
116 iif = af->skb_iif(chunk->skb);
117
118 return iif;
119}
120
121/* RFC 2960 3.3.2 Initiation (INIT) (1)
122 *
123 * Note 2: The ECN capable field is reserved for future use of
124 * Explicit Congestion Notification.
125 */
126static const struct sctp_paramhdr ecap_param = {
127 SCTP_PARAM_ECN_CAPABLE,
Harvey Harrison09640e62009-02-01 00:45:17 -0800128 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129};
130static const struct sctp_paramhdr prsctp_param = {
131 SCTP_PARAM_FWD_TSN_SUPPORT,
Harvey Harrison09640e62009-02-01 00:45:17 -0800132 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133};
134
Neil Horman5fa782c2010-04-28 10:30:59 +0000135/* A helper to initialize an op error inside a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 * provided chunk, as most cause codes will be embedded inside an
137 * abort chunk.
138 */
Al Viro5bf2db02006-11-20 16:59:45 -0800139void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800140 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 sctp_errhdr_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 __u16 len;
144
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900145 /* Cause code constants are now defined in network order. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 err.cause = cause_code;
147 len = sizeof(sctp_errhdr_t) + paylen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 err.length = htons(len);
Vlad Yasevich4a1c0102007-01-09 14:35:51 -0800149 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Neil Horman5fa782c2010-04-28 10:30:59 +0000152/* A helper to initialize an op error inside a
153 * provided chunk, as most cause codes will be embedded inside an
154 * abort chunk. Differs from sctp_init_cause in that it won't oops
155 * if there isn't enough space in the op error chunk
156 */
Ioan Orghicidb28aaf2012-07-13 07:16:37 +0000157static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
Neil Horman5fa782c2010-04-28 10:30:59 +0000158 size_t paylen)
159{
160 sctp_errhdr_t err;
161 __u16 len;
162
163 /* Cause code constants are now defined in network order. */
164 err.cause = cause_code;
165 len = sizeof(sctp_errhdr_t) + paylen;
166 err.length = htons(len);
167
Wei Yongjun2e3219b2010-05-17 22:51:58 -0700168 if (skb_tailroom(chunk->skb) < len)
Neil Horman5fa782c2010-04-28 10:30:59 +0000169 return -ENOSPC;
170 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
171 sizeof(sctp_errhdr_t),
172 &err);
173 return 0;
174}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175/* 3.3.2 Initiation (INIT) (1)
176 *
177 * This chunk is used to initiate a SCTP association between two
178 * endpoints. The format of the INIT chunk is shown below:
179 *
180 * 0 1 2 3
181 * 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
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Type = 1 | Chunk Flags | Chunk Length |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Initiate Tag |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * | Advertised Receiver Window Credit (a_rwnd) |
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * | Number of Outbound Streams | Number of Inbound Streams |
190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
191 * | Initial TSN |
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
193 * \ \
194 * / Optional/Variable-Length Parameters /
195 * \ \
196 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
197 *
198 *
199 * The INIT chunk contains the following parameters. Unless otherwise
200 * noted, each parameter MUST only be included once in the INIT chunk.
201 *
202 * Fixed Parameters Status
203 * ----------------------------------------------
204 * Initiate Tag Mandatory
205 * Advertised Receiver Window Credit Mandatory
206 * Number of Outbound Streams Mandatory
207 * Number of Inbound Streams Mandatory
208 * Initial TSN Mandatory
209 *
210 * Variable Parameters Status Type Value
211 * -------------------------------------------------------------
212 * IPv4 Address (Note 1) Optional 5
213 * IPv6 Address (Note 1) Optional 6
214 * Cookie Preservative Optional 9
215 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
216 * Host Name Address (Note 3) Optional 11
217 * Supported Address Types (Note 4) Optional 12
218 */
219struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
220 const struct sctp_bind_addr *bp,
Al Virodd0fc662005-10-07 07:46:04 +0100221 gfp_t gfp, int vparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000223 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200224 struct sctp_endpoint *ep = asoc->ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 sctp_inithdr_t init;
226 union sctp_params addrs;
227 size_t chunksize;
228 struct sctp_chunk *retval = NULL;
229 int num_types, addrs_len = 0;
230 struct sctp_sock *sp;
231 sctp_supported_addrs_param_t sat;
Al Viro3dbe8652006-11-20 17:25:49 -0800232 __be16 types[2];
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800233 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700234 sctp_supported_ext_param_t ext_param;
235 int num_ext = 0;
236 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700237 sctp_paramhdr_t *auth_chunks = NULL,
238 *auth_hmacs = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 /* RFC 2960 3.3.2 Initiation (INIT) (1)
241 *
242 * Note 1: The INIT chunks can contain multiple addresses that
243 * can be IPv4 and/or IPv6 in any combination.
244 */
245 retval = NULL;
246
247 /* Convert the provided bind address list to raw format. */
248 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
249
250 init.init_tag = htonl(asoc->c.my_vtag);
251 init.a_rwnd = htonl(asoc->rwnd);
252 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
253 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
254 init.initial_tsn = htonl(asoc->c.initial_tsn);
255
256 /* How many address types are needed? */
257 sp = sctp_sk(asoc->base.sk);
258 num_types = sp->pf->supported_addrs(sp, types);
259
Wei Yongjuna8170c32010-04-28 08:47:21 +0000260 chunksize = sizeof(init) + addrs_len;
261 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 chunksize += sizeof(ecap_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500263
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000264 if (net->sctp.prsctp_enable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800265 chunksize += sizeof(prsctp_param);
266
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700267 /* ADDIP: Section 4.2.7:
268 * An implementation supporting this extension [ADDIP] MUST list
269 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
270 * INIT-ACK parameters.
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700271 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000272 if (net->sctp.addip_enable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700273 extensions[num_ext] = SCTP_CID_ASCONF;
274 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
275 num_ext += 2;
276 }
277
malc6fc791e2009-03-12 09:49:20 +0000278 if (sp->adaptation_ind)
279 chunksize += sizeof(aiparam);
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 chunksize += vparam_len;
282
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700283 /* Account for AUTH related parameters */
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200284 if (ep->auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700285 /* Add random parameter length*/
286 chunksize += sizeof(asoc->c.auth_random);
287
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
290 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000291 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700292 else
293 auth_hmacs = NULL;
294
295 /* Add CHUNKS parameter length */
296 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
297 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000298 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700299 else
Vlad Yasevich9baffaa2007-11-29 08:44:34 -0500300 auth_chunks = NULL;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700301
302 extensions[num_ext] = SCTP_CID_AUTH;
303 num_ext += 1;
304 }
305
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700306 /* If we have any extensions to report, account for that */
307 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000308 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
309 num_ext);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 /* RFC 2960 3.3.2 Initiation (INIT) (1)
312 *
313 * Note 3: An INIT chunk MUST NOT contain more than one Host
314 * Name address parameter. Moreover, the sender of the INIT
315 * MUST NOT combine any other address types with the Host Name
316 * address in the INIT. The receiver of INIT MUST ignore any
317 * other address types if the Host Name address parameter is
318 * present in the received INIT chunk.
319 *
320 * PLEASE DO NOT FIXME [This version does not support Host Name.]
321 */
322
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300323 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (!retval)
325 goto nodata;
326
327 retval->subh.init_hdr =
328 sctp_addto_chunk(retval, sizeof(init), &init);
329 retval->param_hdr.v =
330 sctp_addto_chunk(retval, addrs_len, addrs.v);
331
332 /* RFC 2960 3.3.2 Initiation (INIT) (1)
333 *
334 * Note 4: This parameter, when present, specifies all the
335 * address types the sending endpoint can support. The absence
336 * of this parameter indicates that the sending endpoint can
337 * support any address type.
338 */
339 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
340 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
341 sctp_addto_chunk(retval, sizeof(sat), &sat);
342 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
343
344 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700345
Joe Perches7aa1b542007-12-20 14:03:52 -0800346 /* Add the supported extensions parameter. Be nice and add this
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700347 * fist before addiding the parameters for the extensions themselves
348 */
349 if (num_ext) {
350 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
351 ext_param.param_hdr.length =
352 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
353 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
354 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500355 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700356 }
357
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000358 if (net->sctp.prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700360
malc6fc791e2009-03-12 09:49:20 +0000361 if (sp->adaptation_ind) {
362 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
363 aiparam.param_hdr.length = htons(sizeof(aiparam));
364 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
365 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
366 }
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700367
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700368 /* Add SCTP-AUTH chunks to the parameter list */
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200369 if (ep->auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700370 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
371 asoc->c.auth_random);
372 if (auth_hmacs)
373 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
374 auth_hmacs);
375 if (auth_chunks)
376 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
377 auth_chunks);
378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379nodata:
Jesper Juhla51482b2005-11-08 09:41:34 -0800380 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 return retval;
382}
383
384struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
385 const struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100386 gfp_t gfp, int unkparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 sctp_inithdr_t initack;
389 struct sctp_chunk *retval;
390 union sctp_params addrs;
malc6fc791e2009-03-12 09:49:20 +0000391 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 int addrs_len;
393 sctp_cookie_param_t *cookie;
394 int cookie_len;
395 size_t chunksize;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800396 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700397 sctp_supported_ext_param_t ext_param;
398 int num_ext = 0;
399 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700400 sctp_paramhdr_t *auth_chunks = NULL,
401 *auth_hmacs = NULL,
402 *auth_random = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 retval = NULL;
405
406 /* Note: there may be no addresses to embed. */
407 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
408
409 initack.init_tag = htonl(asoc->c.my_vtag);
410 initack.a_rwnd = htonl(asoc->rwnd);
411 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
412 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
413 initack.initial_tsn = htonl(asoc->c.initial_tsn);
414
415 /* FIXME: We really ought to build the cookie right
416 * into the packet instead of allocating more fresh memory.
417 */
418 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
419 addrs.v, addrs_len);
420 if (!cookie)
421 goto nomem_cookie;
422
423 /* Calculate the total size of allocation, include the reserved
424 * space for reporting unknown parameters if it is specified.
425 */
malc6fc791e2009-03-12 09:49:20 +0000426 sp = sctp_sk(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
428
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900429 /* Tell peer that we'll do ECN only if peer advertised such cap. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (asoc->peer.ecn_capable)
431 chunksize += sizeof(ecap_param);
432
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000433 if (asoc->peer.prsctp_capable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800434 chunksize += sizeof(prsctp_param);
435
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000436 if (asoc->peer.asconf_capable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700437 extensions[num_ext] = SCTP_CID_ASCONF;
438 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
439 num_ext += 2;
440 }
441
malc6fc791e2009-03-12 09:49:20 +0000442 if (sp->adaptation_ind)
443 chunksize += sizeof(aiparam);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700445 if (asoc->peer.auth_capable) {
446 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
447 chunksize += ntohs(auth_random->length);
448
449 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
450 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000451 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700452 else
453 auth_hmacs = NULL;
454
455 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
456 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000457 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700458 else
459 auth_chunks = NULL;
460
461 extensions[num_ext] = SCTP_CID_AUTH;
462 num_ext += 1;
463 }
464
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500465 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000466 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
467 num_ext);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 /* Now allocate and fill out the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300470 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (!retval)
472 goto nomem_chunk;
473
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400474 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
475 *
476 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
477 * HEARTBEAT ACK, * etc.) to the same destination transport
478 * address from which it received the DATA or control chunk
479 * to which it is replying.
480 *
481 * [INIT ACK back to where the INIT came from.]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 */
483 retval->transport = chunk->transport;
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 retval->subh.init_hdr =
486 sctp_addto_chunk(retval, sizeof(initack), &initack);
487 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
488 sctp_addto_chunk(retval, cookie_len, cookie);
489 if (asoc->peer.ecn_capable)
490 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700491 if (num_ext) {
492 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
493 ext_param.param_hdr.length =
494 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
495 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
496 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500497 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (asoc->peer.prsctp_capable)
500 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
501
malc6fc791e2009-03-12 09:49:20 +0000502 if (sp->adaptation_ind) {
503 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
504 aiparam.param_hdr.length = htons(sizeof(aiparam));
505 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
506 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700509 if (asoc->peer.auth_capable) {
510 sctp_addto_chunk(retval, ntohs(auth_random->length),
511 auth_random);
512 if (auth_hmacs)
513 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
514 auth_hmacs);
515 if (auth_chunks)
516 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
517 auth_chunks);
518 }
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* We need to remove the const qualifier at this point. */
521 retval->asoc = (struct sctp_association *) asoc;
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523nomem_chunk:
524 kfree(cookie);
525nomem_cookie:
Jesper Juhla51482b2005-11-08 09:41:34 -0800526 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 return retval;
528}
529
530/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
531 *
532 * This chunk is used only during the initialization of an association.
533 * It is sent by the initiator of an association to its peer to complete
534 * the initialization process. This chunk MUST precede any DATA chunk
535 * sent within the association, but MAY be bundled with one or more DATA
536 * chunks in the same packet.
537 *
538 * 0 1 2 3
539 * 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
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * | Type = 10 |Chunk Flags | Length |
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
543 * / Cookie /
544 * \ \
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 *
547 * Chunk Flags: 8 bit
548 *
549 * Set to zero on transmit and ignored on receipt.
550 *
551 * Length: 16 bits (unsigned integer)
552 *
553 * Set to the size of the chunk in bytes, including the 4 bytes of
554 * the chunk header and the size of the Cookie.
555 *
556 * Cookie: variable size
557 *
558 * This field must contain the exact cookie received in the
559 * State Cookie parameter from the previous INIT ACK.
560 *
561 * An implementation SHOULD make the cookie as small as possible
562 * to insure interoperability.
563 */
564struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
565 const struct sctp_chunk *chunk)
566{
567 struct sctp_chunk *retval;
568 void *cookie;
569 int cookie_len;
570
571 cookie = asoc->peer.cookie;
572 cookie_len = asoc->peer.cookie_len;
573
574 /* Build a cookie echo chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300575 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
576 cookie_len, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (!retval)
578 goto nodata;
579 retval->subh.cookie_hdr =
580 sctp_addto_chunk(retval, cookie_len, cookie);
581
582 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
583 *
584 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
585 * HEARTBEAT ACK, * etc.) to the same destination transport
586 * address from which it * received the DATA or control chunk
587 * to which it is replying.
588 *
589 * [COOKIE ECHO back to where the INIT ACK came from.]
590 */
591 if (chunk)
592 retval->transport = chunk->transport;
593
594nodata:
595 return retval;
596}
597
598/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
599 *
600 * This chunk is used only during the initialization of an
601 * association. It is used to acknowledge the receipt of a COOKIE
602 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
603 * within the association, but MAY be bundled with one or more DATA
604 * chunks or SACK chunk in the same SCTP packet.
605 *
606 * 0 1 2 3
607 * 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
608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * | Type = 11 |Chunk Flags | Length = 4 |
610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
611 *
612 * Chunk Flags: 8 bits
613 *
614 * Set to zero on transmit and ignored on receipt.
615 */
616struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
617 const struct sctp_chunk *chunk)
618{
619 struct sctp_chunk *retval;
620
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300621 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
624 *
625 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
626 * HEARTBEAT ACK, * etc.) to the same destination transport
627 * address from which it * received the DATA or control chunk
628 * to which it is replying.
629 *
630 * [COOKIE ACK back to where the COOKIE ECHO came from.]
631 */
632 if (retval && chunk)
633 retval->transport = chunk->transport;
634
635 return retval;
636}
637
638/*
639 * Appendix A: Explicit Congestion Notification:
640 * CWR:
641 *
642 * RFC 2481 details a specific bit for a sender to send in the header of
643 * its next outbound TCP segment to indicate to its peer that it has
644 * reduced its congestion window. This is termed the CWR bit. For
645 * SCTP the same indication is made by including the CWR chunk.
646 * This chunk contains one data element, i.e. the TSN number that
647 * was sent in the ECNE chunk. This element represents the lowest
648 * TSN number in the datagram that was originally marked with the
649 * CE bit.
650 *
651 * 0 1 2 3
652 * 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
653 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
654 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
655 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * | Lowest TSN Number |
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
658 *
659 * Note: The CWR is considered a Control chunk.
660 */
661struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
662 const __u32 lowest_tsn,
663 const struct sctp_chunk *chunk)
664{
665 struct sctp_chunk *retval;
666 sctp_cwrhdr_t cwr;
667
668 cwr.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400669 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300670 sizeof(sctp_cwrhdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 if (!retval)
673 goto nodata;
674
675 retval->subh.ecn_cwr_hdr =
676 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
677
678 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
679 *
680 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
681 * HEARTBEAT ACK, * etc.) to the same destination transport
682 * address from which it * received the DATA or control chunk
683 * to which it is replying.
684 *
685 * [Report a reduced congestion window back to where the ECNE
686 * came from.]
687 */
688 if (chunk)
689 retval->transport = chunk->transport;
690
691nodata:
692 return retval;
693}
694
695/* Make an ECNE chunk. This is a congestion experienced report. */
696struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
697 const __u32 lowest_tsn)
698{
699 struct sctp_chunk *retval;
700 sctp_ecnehdr_t ecne;
701
702 ecne.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400703 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300704 sizeof(sctp_ecnehdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (!retval)
706 goto nodata;
707 retval->subh.ecne_hdr =
708 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
709
710nodata:
711 return retval;
712}
713
714/* Make a DATA chunk for the given association from the provided
715 * parameters. However, do not populate the data payload.
716 */
717struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
718 const struct sctp_sndrcvinfo *sinfo,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300719 int data_len, __u8 flags, __u16 ssn,
720 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721{
722 struct sctp_chunk *retval;
723 struct sctp_datahdr dp;
724 int chunk_len;
725
726 /* We assign the TSN as LATE as possible, not here when
727 * creating the chunk.
728 */
729 dp.tsn = 0;
730 dp.stream = htons(sinfo->sinfo_stream);
731 dp.ppid = sinfo->sinfo_ppid;
732
733 /* Set the flags for an unordered send. */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700734 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 flags |= SCTP_DATA_UNORDERED;
736 dp.ssn = 0;
737 } else
738 dp.ssn = htons(ssn);
739
740 chunk_len = sizeof(dp) + data_len;
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300741 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 if (!retval)
743 goto nodata;
744
745 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
746 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
747
748nodata:
749 return retval;
750}
751
752/* Create a selective ackowledgement (SACK) for the given
753 * association. This reports on which TSN's we've seen to date,
754 * including duplicates and gaps.
755 */
756struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
757{
758 struct sctp_chunk *retval;
759 struct sctp_sackhdr sack;
760 int len;
761 __u32 ctsn;
762 __u16 num_gabs, num_dup_tsns;
Neil Horman42448542012-06-30 03:04:26 +0000763 struct sctp_association *aptr = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
Vlad Yasevich02015182008-10-08 14:19:01 -0700765 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
Neil Horman42448542012-06-30 03:04:26 +0000766 struct sctp_transport *trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
Vlad Yasevich02015182008-10-08 14:19:01 -0700768 memset(gabs, 0, sizeof(gabs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 ctsn = sctp_tsnmap_get_ctsn(map);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200770
771 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
773 /* How much room is needed in the chunk? */
Vlad Yasevich02015182008-10-08 14:19:01 -0700774 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 num_dup_tsns = sctp_tsnmap_num_dups(map);
776
777 /* Initialize the SACK header. */
778 sack.cum_tsn_ack = htonl(ctsn);
779 sack.a_rwnd = htonl(asoc->a_rwnd);
780 sack.num_gap_ack_blocks = htons(num_gabs);
781 sack.num_dup_tsns = htons(num_dup_tsns);
782
783 len = sizeof(sack)
784 + sizeof(struct sctp_gap_ack_block) * num_gabs
785 + sizeof(__u32) * num_dup_tsns;
786
787 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300788 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (!retval)
790 goto nodata;
791
792 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
793 *
794 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
795 * HEARTBEAT ACK, etc.) to the same destination transport
796 * address from which it received the DATA or control chunk to
797 * which it is replying. This rule should also be followed if
798 * the endpoint is bundling DATA chunks together with the
799 * reply chunk.
800 *
801 * However, when acknowledging multiple DATA chunks received
802 * in packets from different source addresses in a single
803 * SACK, the SACK chunk may be transmitted to one of the
804 * destination transport addresses from which the DATA or
805 * control chunks being acknowledged were received.
806 *
807 * [BUG: We do not implement the following paragraph.
808 * Perhaps we should remember the last transport we used for a
809 * SACK and avoid that (if possible) if we have seen any
810 * duplicates. --piggy]
811 *
812 * When a receiver of a duplicate DATA chunk sends a SACK to a
813 * multi- homed endpoint it MAY be beneficial to vary the
814 * destination address and not use the source address of the
815 * DATA chunk. The reason being that receiving a duplicate
816 * from a multi-homed endpoint might indicate that the return
817 * path (as specified in the source address of the DATA chunk)
818 * for the SACK is broken.
819 *
820 * [Send to the address from which we last received a DATA chunk.]
821 */
822 retval->transport = asoc->peer.last_data_from;
823
824 retval->subh.sack_hdr =
825 sctp_addto_chunk(retval, sizeof(sack), &sack);
826
827 /* Add the gap ack block information. */
828 if (num_gabs)
829 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
Vlad Yasevich02015182008-10-08 14:19:01 -0700830 gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 /* Add the duplicate TSN information. */
Michele Baldessari196d6752012-12-01 04:49:42 +0000833 if (num_dup_tsns) {
834 aptr->stats.idupchunks += num_dup_tsns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
836 sctp_tsnmap_get_dups(map));
Michele Baldessari196d6752012-12-01 04:49:42 +0000837 }
Neil Horman42448542012-06-30 03:04:26 +0000838 /* Once we have a sack generated, check to see what our sack
839 * generation is, if its 0, reset the transports to 0, and reset
840 * the association generation to 1
841 *
842 * The idea is that zero is never used as a valid generation for the
843 * association so no transport will match after a wrap event like this,
844 * Until the next sack
845 */
846 if (++aptr->peer.sack_generation == 0) {
847 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
848 transports)
849 trans->sack_generation = 0;
850 aptr->peer.sack_generation = 1;
851 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852nodata:
853 return retval;
854}
855
856/* Make a SHUTDOWN chunk. */
857struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
858 const struct sctp_chunk *chunk)
859{
860 struct sctp_chunk *retval;
861 sctp_shutdownhdr_t shut;
862 __u32 ctsn;
863
864 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
865 shut.cum_tsn_ack = htonl(ctsn);
866
Vlad Yasevich072017b2013-08-09 22:05:36 -0400867 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300868 sizeof(sctp_shutdownhdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 if (!retval)
870 goto nodata;
871
872 retval->subh.shutdown_hdr =
873 sctp_addto_chunk(retval, sizeof(shut), &shut);
874
875 if (chunk)
876 retval->transport = chunk->transport;
877nodata:
878 return retval;
879}
880
881struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
882 const struct sctp_chunk *chunk)
883{
884 struct sctp_chunk *retval;
885
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300886 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
887 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
890 *
891 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
892 * HEARTBEAT ACK, * etc.) to the same destination transport
893 * address from which it * received the DATA or control chunk
894 * to which it is replying.
895 *
896 * [ACK back to where the SHUTDOWN came from.]
897 */
898 if (retval && chunk)
899 retval->transport = chunk->transport;
900
901 return retval;
902}
903
904struct sctp_chunk *sctp_make_shutdown_complete(
905 const struct sctp_association *asoc,
906 const struct sctp_chunk *chunk)
907{
908 struct sctp_chunk *retval;
909 __u8 flags = 0;
910
Jerome Forissier047a2422005-04-28 11:58:43 -0700911 /* Set the T-bit if we have no association (vtag will be
912 * reflected)
913 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
915
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300916 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
917 0, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
920 *
921 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
922 * HEARTBEAT ACK, * etc.) to the same destination transport
923 * address from which it * received the DATA or control chunk
924 * to which it is replying.
925 *
926 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
927 * came from.]
928 */
929 if (retval && chunk)
930 retval->transport = chunk->transport;
931
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900932 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933}
934
935/* Create an ABORT. Note that we set the T bit if we have no
Jerome Forissier047a2422005-04-28 11:58:43 -0700936 * association, except when responding to an INIT (sctpimpguide 2.41).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 */
938struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
939 const struct sctp_chunk *chunk,
940 const size_t hint)
941{
942 struct sctp_chunk *retval;
943 __u8 flags = 0;
944
Jerome Forissier047a2422005-04-28 11:58:43 -0700945 /* Set the T-bit if we have no association and 'chunk' is not
946 * an INIT (vtag will be reflected).
947 */
948 if (!asoc) {
949 if (chunk && chunk->chunk_hdr &&
950 chunk->chunk_hdr->type == SCTP_CID_INIT)
951 flags = 0;
952 else
953 flags = SCTP_CHUNK_FLAG_T;
954 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300956 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
957 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
960 *
961 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
962 * HEARTBEAT ACK, * etc.) to the same destination transport
963 * address from which it * received the DATA or control chunk
964 * to which it is replying.
965 *
966 * [ABORT back to where the offender came from.]
967 */
968 if (retval && chunk)
969 retval->transport = chunk->transport;
970
971 return retval;
972}
973
974/* Helper to create ABORT with a NO_USER_DATA error. */
975struct sctp_chunk *sctp_make_abort_no_data(
976 const struct sctp_association *asoc,
977 const struct sctp_chunk *chunk, __u32 tsn)
978{
979 struct sctp_chunk *retval;
Al Viro9f81bcd2006-11-20 17:26:34 -0800980 __be32 payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
982 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
983 + sizeof(tsn));
984
985 if (!retval)
986 goto no_mem;
987
988 /* Put the tsn back into network byte order. */
989 payload = htonl(tsn);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800990 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
991 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
994 *
995 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
996 * HEARTBEAT ACK, * etc.) to the same destination transport
997 * address from which it * received the DATA or control chunk
998 * to which it is replying.
999 *
1000 * [ABORT back to where the offender came from.]
1001 */
1002 if (chunk)
1003 retval->transport = chunk->transport;
1004
1005no_mem:
1006 return retval;
1007}
1008
1009/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1010struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
Al Viro6ce8e9c2014-04-06 21:25:44 -04001011 struct msghdr *msg,
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001012 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013{
1014 struct sctp_chunk *retval;
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001015 void *payload = NULL;
1016 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001018 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (!retval)
1020 goto err_chunk;
1021
1022 if (paylen) {
1023 /* Put the msg_iov together into payload. */
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001024 payload = kmalloc(paylen, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (!payload)
1026 goto err_payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
Al Viro6ce8e9c2014-04-06 21:25:44 -04001028 err = memcpy_from_msg(payload, msg, paylen);
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001029 if (err < 0)
1030 goto err_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001033 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1034 sctp_addto_chunk(retval, paylen, payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
1036 if (paylen)
1037 kfree(payload);
1038
1039 return retval;
1040
1041err_copy:
1042 kfree(payload);
1043err_payload:
1044 sctp_chunk_free(retval);
1045 retval = NULL;
1046err_chunk:
1047 return retval;
1048}
1049
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001050/* Append bytes to the end of a parameter. Will panic if chunk is not big
1051 * enough.
1052 */
1053static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1054 const void *data)
1055{
1056 void *target;
1057 int chunklen = ntohs(chunk->chunk_hdr->length);
1058
1059 target = skb_put(chunk->skb, len);
1060
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001061 if (data)
1062 memcpy(target, data, len);
1063 else
1064 memset(target, 0, len);
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001065
1066 /* Adjust the chunk length field. */
1067 chunk->chunk_hdr->length = htons(chunklen + len);
1068 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1069
1070 return target;
1071}
1072
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001073/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074struct sctp_chunk *sctp_make_abort_violation(
1075 const struct sctp_association *asoc,
1076 const struct sctp_chunk *chunk,
1077 const __u8 *payload,
1078 const size_t paylen)
1079{
1080 struct sctp_chunk *retval;
1081 struct sctp_paramhdr phdr;
1082
1083 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001084 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 if (!retval)
1086 goto end;
1087
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001088 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1089 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 phdr.type = htons(chunk->chunk_hdr->type);
1092 phdr.length = chunk->chunk_hdr->length;
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001093 sctp_addto_chunk(retval, paylen, payload);
1094 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096end:
1097 return retval;
1098}
1099
Wei Yongjunba016672008-09-30 05:32:24 -07001100struct sctp_chunk *sctp_make_violation_paramlen(
1101 const struct sctp_association *asoc,
1102 const struct sctp_chunk *chunk,
1103 struct sctp_paramhdr *param)
1104{
1105 struct sctp_chunk *retval;
1106 static const char error[] = "The following parameter had invalid length:";
1107 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1108 sizeof(sctp_paramhdr_t);
1109
1110 retval = sctp_make_abort(asoc, chunk, payload_len);
1111 if (!retval)
1112 goto nodata;
1113
1114 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1115 sizeof(error) + sizeof(sctp_paramhdr_t));
1116 sctp_addto_chunk(retval, sizeof(error), error);
1117 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1118
1119nodata:
1120 return retval;
1121}
1122
Neil Hormande4594a2012-11-20 10:14:30 +00001123struct sctp_chunk *sctp_make_violation_max_retrans(
1124 const struct sctp_association *asoc,
1125 const struct sctp_chunk *chunk)
1126{
1127 struct sctp_chunk *retval;
1128 static const char error[] = "Association exceeded its max_retans count";
1129 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1130
1131 retval = sctp_make_abort(asoc, chunk, payload_len);
1132 if (!retval)
1133 goto nodata;
1134
1135 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1136 sctp_addto_chunk(retval, sizeof(error), error);
1137
1138nodata:
1139 return retval;
1140}
1141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142/* Make a HEARTBEAT chunk. */
1143struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
Wei Yongjun92c73af2011-04-19 21:31:47 +00001144 const struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145{
Wei Yongjun92c73af2011-04-19 21:31:47 +00001146 struct sctp_chunk *retval;
1147 sctp_sender_hb_info_t hbinfo;
1148
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001149 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1150 sizeof(hbinfo), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 if (!retval)
1153 goto nodata;
1154
Wei Yongjun92c73af2011-04-19 21:31:47 +00001155 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1156 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1157 hbinfo.daddr = transport->ipaddr;
1158 hbinfo.sent_at = jiffies;
1159 hbinfo.hb_nonce = transport->hb_nonce;
1160
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 /* Cast away the 'const', as this is just telling the chunk
1162 * what transport it belongs to.
1163 */
1164 retval->transport = (struct sctp_transport *) transport;
Wei Yongjun92c73af2011-04-19 21:31:47 +00001165 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1166 &hbinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168nodata:
1169 return retval;
1170}
1171
1172struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1173 const struct sctp_chunk *chunk,
1174 const void *payload, const size_t paylen)
1175{
1176 struct sctp_chunk *retval;
1177
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001178 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1179 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 if (!retval)
1181 goto nodata;
1182
1183 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1184
1185 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1186 *
1187 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1188 * HEARTBEAT ACK, * etc.) to the same destination transport
1189 * address from which it * received the DATA or control chunk
1190 * to which it is replying.
1191 *
1192 * [HBACK back to where the HEARTBEAT came from.]
1193 */
1194 if (chunk)
1195 retval->transport = chunk->transport;
1196
1197nodata:
1198 return retval;
1199}
1200
1201/* Create an Operation Error chunk with the specified space reserved.
1202 * This routine can be used for containing multiple causes in the chunk.
1203 */
1204static struct sctp_chunk *sctp_make_op_error_space(
1205 const struct sctp_association *asoc,
1206 const struct sctp_chunk *chunk,
1207 size_t size)
1208{
1209 struct sctp_chunk *retval;
1210
Vlad Yasevich072017b2013-08-09 22:05:36 -04001211 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001212 sizeof(sctp_errhdr_t) + size, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (!retval)
1214 goto nodata;
1215
1216 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1217 *
1218 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1219 * HEARTBEAT ACK, etc.) to the same destination transport
1220 * address from which it received the DATA or control chunk
1221 * to which it is replying.
1222 *
1223 */
1224 if (chunk)
1225 retval->transport = chunk->transport;
1226
1227nodata:
1228 return retval;
1229}
1230
Neil Horman5fa782c2010-04-28 10:30:59 +00001231/* Create an Operation Error chunk of a fixed size,
1232 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1233 * This is a helper function to allocate an error chunk for
1234 * for those invalid parameter codes in which we may not want
Jorrit Schippersd82603c2012-12-27 17:33:02 +01001235 * to report all the errors, if the incoming chunk is large
Neil Horman5fa782c2010-04-28 10:30:59 +00001236 */
1237static inline struct sctp_chunk *sctp_make_op_error_fixed(
1238 const struct sctp_association *asoc,
1239 const struct sctp_chunk *chunk)
1240{
1241 size_t size = asoc ? asoc->pathmtu : 0;
1242
1243 if (!size)
1244 size = SCTP_DEFAULT_MAXSEGMENT;
1245
1246 return sctp_make_op_error_space(asoc, chunk, size);
1247}
1248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249/* Create an Operation Error chunk. */
1250struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1251 const struct sctp_chunk *chunk,
Al Viro63706c52006-11-20 17:00:05 -08001252 __be16 cause_code, const void *payload,
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001253 size_t paylen, size_t reserve_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
1255 struct sctp_chunk *retval;
1256
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001257 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 if (!retval)
1259 goto nodata;
1260
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001261 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001262 sctp_addto_chunk(retval, paylen, payload);
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001263 if (reserve_tail)
1264 sctp_addto_param(retval, reserve_tail, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265
1266nodata:
1267 return retval;
1268}
1269
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001270struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1271{
1272 struct sctp_chunk *retval;
1273 struct sctp_hmac *hmac_desc;
1274 struct sctp_authhdr auth_hdr;
1275 __u8 *hmac;
1276
1277 /* Get the first hmac that the peer told us to use */
1278 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1279 if (unlikely(!hmac_desc))
1280 return NULL;
1281
Vlad Yasevich072017b2013-08-09 22:05:36 -04001282 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001283 hmac_desc->hmac_len + sizeof(sctp_authhdr_t),
1284 GFP_ATOMIC);
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001285 if (!retval)
1286 return NULL;
1287
1288 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1289 auth_hdr.shkey_id = htons(asoc->active_key_id);
1290
1291 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1292 &auth_hdr);
1293
1294 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1295 memset(hmac, 0, hmac_desc->hmac_len);
1296
1297 /* Adjust the chunk header to include the empty MAC */
1298 retval->chunk_hdr->length =
1299 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1300 retval->chunk_end = skb_tail_pointer(retval->skb);
1301
1302 return retval;
1303}
1304
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306/********************************************************************
1307 * 2nd Level Abstractions
1308 ********************************************************************/
1309
1310/* Turn an skb into a chunk.
1311 * FIXME: Eventually move the structure directly inside the skb->cb[].
wangweidong3dc0a542013-10-26 16:06:31 +08001312 *
1313 * sctpimpguide-05.txt Section 2.8.2
1314 * M1) Each time a new DATA chunk is transmitted
1315 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1316 * 'TSN.Missing.Report' count will be used to determine missing chunks
1317 * and when to fast retransmit.
1318 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 */
1320struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1321 const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001322 struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323{
1324 struct sctp_chunk *retval;
1325
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001326 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
1328 if (!retval)
1329 goto nodata;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001330 if (!sk)
1331 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
David S. Miller79af02c2005-07-08 21:47:49 -07001333 INIT_LIST_HEAD(&retval->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 retval->skb = skb;
1335 retval->asoc = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 retval->singleton = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Neil Hormanc226ef92008-07-25 12:44:09 -04001338 retval->fast_retransmit = SCTP_CAN_FRTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 /* Polish the bead hole. */
1341 INIT_LIST_HEAD(&retval->transmitted_list);
1342 INIT_LIST_HEAD(&retval->frag_list);
1343 SCTP_DBG_OBJCNT_INC(chunk);
1344 atomic_set(&retval->refcnt, 1);
1345
1346nodata:
1347 return retval;
1348}
1349
1350/* Set chunk->source and dest based on the IP header in chunk->skb. */
1351void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1352 union sctp_addr *dest)
1353{
Al Virof235fca2006-11-20 17:09:01 -08001354 memcpy(&chunk->source, src, sizeof(union sctp_addr));
Al Viro16b0a032006-11-20 17:13:38 -08001355 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356}
1357
1358/* Extract the source address from a chunk. */
1359const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1360{
1361 /* If we have a known transport, use that. */
1362 if (chunk->transport) {
Al Viro6a1e5f32006-11-20 17:12:25 -08001363 return &chunk->transport->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 } else {
1365 /* Otherwise, extract it from the IP header. */
Al Viro6a1e5f32006-11-20 17:12:25 -08001366 return &chunk->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 }
1368}
1369
1370/* Create a new chunk, setting the type and flags headers from the
1371 * arguments, reserving enough space for a 'paylen' byte payload.
1372 */
Vlad Yasevich072017b2013-08-09 22:05:36 -04001373static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001374 __u8 type, __u8 flags, int paylen,
1375 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
1377 struct sctp_chunk *retval;
1378 sctp_chunkhdr_t *chunk_hdr;
1379 struct sk_buff *skb;
1380 struct sock *sk;
1381
1382 /* No need to allocate LL here, as this is only a chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001383 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 if (!skb)
1385 goto nodata;
1386
1387 /* Make room for the chunk header. */
1388 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1389 chunk_hdr->type = type;
1390 chunk_hdr->flags = flags;
1391 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1392
1393 sk = asoc ? asoc->base.sk : NULL;
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001394 retval = sctp_chunkify(skb, asoc, sk, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 if (!retval) {
1396 kfree_skb(skb);
1397 goto nodata;
1398 }
1399
1400 retval->chunk_hdr = chunk_hdr;
1401 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1402
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001403 /* Determine if the chunk needs to be authenticated */
1404 if (sctp_auth_send_cid(type, asoc))
1405 retval->auth = 1;
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return retval;
1408nodata:
1409 return NULL;
1410}
1411
Vlad Yasevich072017b2013-08-09 22:05:36 -04001412static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001413 __u8 flags, int paylen, gfp_t gfp)
Vlad Yasevich072017b2013-08-09 22:05:36 -04001414{
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001415 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -04001416}
1417
1418static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001419 __u8 type, __u8 flags, int paylen,
1420 gfp_t gfp)
Vlad Yasevich072017b2013-08-09 22:05:36 -04001421{
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001422 struct sctp_chunk *chunk;
Vlad Yasevich072017b2013-08-09 22:05:36 -04001423
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001424 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -04001425 if (chunk)
1426 sctp_control_set_owner_w(chunk);
1427
1428 return chunk;
1429}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431/* Release the memory occupied by a chunk. */
1432static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1433{
Vlad Yasevicha08de642007-12-20 14:11:47 -08001434 BUG_ON(!list_empty(&chunk->list));
1435 list_del_init(&chunk->transmitted_list);
1436
Daniel Borkmannc4856582014-03-04 16:35:51 +01001437 consume_skb(chunk->skb);
1438 consume_skb(chunk->auth_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439
1440 SCTP_DBG_OBJCNT_DEC(chunk);
1441 kmem_cache_free(sctp_chunk_cachep, chunk);
1442}
1443
1444/* Possibly, free the chunk. */
1445void sctp_chunk_free(struct sctp_chunk *chunk)
1446{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 /* Release our reference on the message tracker. */
1448 if (chunk->msg)
1449 sctp_datamsg_put(chunk->msg);
1450
1451 sctp_chunk_put(chunk);
1452}
1453
1454/* Grab a reference to the chunk. */
1455void sctp_chunk_hold(struct sctp_chunk *ch)
1456{
1457 atomic_inc(&ch->refcnt);
1458}
1459
1460/* Release a reference to the chunk. */
1461void sctp_chunk_put(struct sctp_chunk *ch)
1462{
1463 if (atomic_dec_and_test(&ch->refcnt))
1464 sctp_chunk_destroy(ch);
1465}
1466
1467/* Append bytes to the end of a chunk. Will panic if chunk is not big
1468 * enough.
1469 */
1470void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1471{
1472 void *target;
1473 void *padding;
1474 int chunklen = ntohs(chunk->chunk_hdr->length);
Wei Yongjun8d614ad2007-08-06 13:55:47 +08001475 int padlen = WORD_ROUND(chunklen) - chunklen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
1477 padding = skb_put(chunk->skb, padlen);
1478 target = skb_put(chunk->skb, len);
1479
1480 memset(padding, 0, padlen);
1481 memcpy(target, data, len);
1482
1483 /* Adjust the chunk length field. */
1484 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001485 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 return target;
1488}
1489
Neil Horman5fa782c2010-04-28 10:30:59 +00001490/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1491 * space in the chunk
1492 */
stephen hemminger6daaf0d2014-01-09 22:31:11 -08001493static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1494 int len, const void *data)
Neil Horman5fa782c2010-04-28 10:30:59 +00001495{
Wei Yongjun2e3219b2010-05-17 22:51:58 -07001496 if (skb_tailroom(chunk->skb) >= len)
Neil Horman5fa782c2010-04-28 10:30:59 +00001497 return sctp_addto_chunk(chunk, len, data);
1498 else
1499 return NULL;
1500}
1501
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502/* Append bytes from user space to the end of a chunk. Will panic if
1503 * chunk is not big enough.
1504 * Returns a kernel err value.
1505 */
Al Viroe0eb0932014-11-15 01:11:23 -05001506int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1507 struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508{
Al Viroe0eb0932014-11-15 01:11:23 -05001509 void *target;
1510 ssize_t copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512 /* Make room in chunk for data. */
1513 target = skb_put(chunk->skb, len);
1514
1515 /* Copy data (whole iovec) into chunk */
Al Viroe0eb0932014-11-15 01:11:23 -05001516 copied = copy_from_iter(target, len, from);
1517 if (copied != len)
1518 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519
1520 /* Adjust the chunk length field. */
1521 chunk->chunk_hdr->length =
1522 htons(ntohs(chunk->chunk_hdr->length) + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001523 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524
Al Viroe0eb0932014-11-15 01:11:23 -05001525 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526}
1527
1528/* Helper function to assign a TSN if needed. This assumes that both
1529 * the data_hdr and association have already been assigned.
1530 */
1531void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1532{
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001533 struct sctp_datamsg *msg;
1534 struct sctp_chunk *lchunk;
1535 struct sctp_stream *stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 __u16 ssn;
1537 __u16 sid;
1538
1539 if (chunk->has_ssn)
1540 return;
1541
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001542 /* All fragments will be on the same stream */
1543 sid = ntohs(chunk->subh.data_hdr->stream);
1544 stream = &chunk->asoc->ssnmap->out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001546 /* Now assign the sequence number to the entire message.
1547 * All fragments must have the same stream sequence number.
1548 */
1549 msg = chunk->msg;
1550 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1551 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1552 ssn = 0;
1553 } else {
1554 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1555 ssn = sctp_ssn_next(stream, sid);
1556 else
1557 ssn = sctp_ssn_peek(stream, sid);
1558 }
1559
1560 lchunk->subh.data_hdr->ssn = htons(ssn);
1561 lchunk->has_ssn = 1;
1562 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563}
1564
1565/* Helper function to assign a TSN if needed. This assumes that both
1566 * the data_hdr and association have already been assigned.
1567 */
1568void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1569{
1570 if (!chunk->has_tsn) {
1571 /* This is the last possible instant to
1572 * assign a TSN.
1573 */
1574 chunk->subh.data_hdr->tsn =
1575 htonl(sctp_association_get_next_tsn(chunk->asoc));
1576 chunk->has_tsn = 1;
1577 }
1578}
1579
1580/* Create a CLOSED association to use with an incoming packet. */
1581struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -07001582 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +01001583 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584{
1585 struct sctp_association *asoc;
1586 struct sk_buff *skb;
1587 sctp_scope_t scope;
1588 struct sctp_af *af;
1589
1590 /* Create the bare association. */
1591 scope = sctp_scope(sctp_source(chunk));
1592 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1593 if (!asoc)
1594 goto nodata;
1595 asoc->temp = 1;
1596 skb = chunk->skb;
1597 /* Create an entry for the source address of the packet. */
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001598 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 if (unlikely(!af))
1600 goto fail;
Al Virod55c41b2006-11-20 17:09:40 -08001601 af->from_skb(&asoc->c.peer_addr, skb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602nodata:
1603 return asoc;
1604
1605fail:
1606 sctp_association_free(asoc);
1607 return NULL;
1608}
1609
1610/* Build a cookie representing asoc.
1611 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1612 */
1613static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1614 const struct sctp_association *asoc,
1615 const struct sctp_chunk *init_chunk,
1616 int *cookie_len,
1617 const __u8 *raw_addrs, int addrs_len)
1618{
1619 sctp_cookie_param_t *retval;
1620 struct sctp_signed_cookie *cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 int headersize, bodysize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001623 /* Header size is static data prior to the actual cookie, including
1624 * any padding.
1625 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001626 headersize = sizeof(sctp_paramhdr_t) +
1627 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001628 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 bodysize = sizeof(struct sctp_cookie)
1630 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1631
1632 /* Pad out the cookie to a multiple to make the signature
1633 * functions simpler to write.
1634 */
1635 if (bodysize % SCTP_COOKIE_MULTIPLE)
1636 bodysize += SCTP_COOKIE_MULTIPLE
1637 - (bodysize % SCTP_COOKIE_MULTIPLE);
1638 *cookie_len = headersize + bodysize;
1639
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 /* Clear this memory since we are sending this data structure
1641 * out on the network.
1642 */
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02001643 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1644 if (!retval)
1645 goto nodata;
1646
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 cookie = (struct sctp_signed_cookie *) retval->body;
1648
1649 /* Set up the parameter header. */
1650 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1651 retval->p.length = htons(*cookie_len);
1652
1653 /* Copy the cookie part of the association itself. */
1654 cookie->c = asoc->c;
1655 /* Save the raw address list length in the cookie. */
1656 cookie->c.raw_addr_list_len = addrs_len;
1657
1658 /* Remember PR-SCTP capability. */
1659 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1660
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001661 /* Save adaptation indication in the cookie. */
1662 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663
1664 /* Set an expiration time for the cookie. */
Daniel Borkmann52db8822013-06-25 18:17:27 +02001665 cookie->c.expiration = ktime_add(asoc->cookie_life,
Marcelo Ricardo Leitnercb5e1732015-12-04 15:14:03 -02001666 ktime_get_real());
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
1668 /* Copy the peer's init packet. */
1669 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1670 ntohs(init_chunk->chunk_hdr->length));
1671
1672 /* Copy the raw local address list of the association. */
1673 memcpy((__u8 *)&cookie->c.peer_init[0] +
1674 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1675
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001676 if (sctp_sk(ep->base.sk)->hmac) {
Herbert Xu5821c762016-01-24 21:20:12 +08001677 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1678 int err;
Herbert Xu1b489e12006-08-20 15:07:14 +10001679
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 /* Sign the message. */
Herbert Xu5821c762016-01-24 21:20:12 +08001681 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1682 desc->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
Herbert Xu5821c762016-01-24 21:20:12 +08001684 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1685 sizeof(ep->secret_key)) ?:
1686 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1687 cookie->signature);
1688 shash_desc_zero(desc);
1689 if (err)
Herbert Xu1b489e12006-08-20 15:07:14 +10001690 goto free_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 }
1692
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 return retval;
Herbert Xu1b489e12006-08-20 15:07:14 +10001694
1695free_cookie:
1696 kfree(retval);
1697nodata:
1698 *cookie_len = 0;
1699 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700}
1701
1702/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1703struct sctp_association *sctp_unpack_cookie(
1704 const struct sctp_endpoint *ep,
1705 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +01001706 struct sctp_chunk *chunk, gfp_t gfp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 int *error, struct sctp_chunk **errp)
1708{
1709 struct sctp_association *retval = NULL;
1710 struct sctp_signed_cookie *cookie;
1711 struct sctp_cookie *bear_cookie;
1712 int headersize, bodysize, fixed_size;
Vlad Yasevich313e7b42006-01-17 11:55:57 -08001713 __u8 *digest = ep->digest;
Daniel Borkmann570617e2013-02-12 05:15:33 +00001714 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 sctp_scope_t scope;
1716 struct sk_buff *skb = chunk->skb;
Daniel Borkmann52db8822013-06-25 18:17:27 +02001717 ktime_t kt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001719 /* Header size is static data prior to the actual cookie, including
1720 * any padding.
1721 */
1722 headersize = sizeof(sctp_chunkhdr_t) +
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001723 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001724 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1726 fixed_size = headersize + sizeof(struct sctp_cookie);
1727
1728 /* Verify that the chunk looks like it even has a cookie.
1729 * There must be enough room for our cookie and our peer's
1730 * INIT chunk.
1731 */
1732 len = ntohs(chunk->chunk_hdr->length);
1733 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1734 goto malformed;
1735
1736 /* Verify that the cookie has been padded out. */
1737 if (bodysize % SCTP_COOKIE_MULTIPLE)
1738 goto malformed;
1739
1740 /* Process the cookie. */
1741 cookie = chunk->subh.cookie_hdr;
1742 bear_cookie = &cookie->c;
1743
1744 if (!sctp_sk(ep->base.sk)->hmac)
1745 goto no_hmac;
1746
1747 /* Check the signature. */
Herbert Xu5821c762016-01-24 21:20:12 +08001748 {
1749 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1750 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Herbert Xu5821c762016-01-24 21:20:12 +08001752 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1753 desc->flags = 0;
1754
1755 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1756 sizeof(ep->secret_key)) ?:
1757 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1758 digest);
1759 shash_desc_zero(desc);
1760
1761 if (err) {
1762 *error = -SCTP_IERROR_NOMEM;
1763 goto fail;
1764 }
Herbert Xu1b489e12006-08-20 15:07:14 +10001765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766
1767 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
Daniel Borkmann570617e2013-02-12 05:15:33 +00001768 *error = -SCTP_IERROR_BAD_SIG;
1769 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 }
1771
1772no_hmac:
1773 /* IG Section 2.35.2:
1774 * 3) Compare the port numbers and the verification tag contained
1775 * within the COOKIE ECHO chunk to the actual port numbers and the
1776 * verification tag within the SCTP common header of the received
1777 * packet. If these values do not match the packet MUST be silently
1778 * discarded,
1779 */
1780 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1781 *error = -SCTP_IERROR_BAD_TAG;
1782 goto fail;
1783 }
1784
Al Viro9b1dfad2006-11-20 17:09:17 -08001785 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1787 *error = -SCTP_IERROR_BAD_PORTS;
1788 goto fail;
1789 }
1790
1791 /* Check to see if the cookie is stale. If there is already
1792 * an association, there is no need to check cookie's expiration
1793 * for init collision case of lost COOKIE ACK.
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001794 * If skb has been timestamped, then use the stamp, otherwise
1795 * use current time. This introduces a small possibility that
1796 * that a cookie may be considered expired, but his would only slow
1797 * down the new association establishment instead of every packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 */
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001799 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
Daniel Borkmann52db8822013-06-25 18:17:27 +02001800 kt = skb_get_ktime(skb);
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001801 else
Marcelo Ricardo Leitnercb5e1732015-12-04 15:14:03 -02001802 kt = ktime_get_real();
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001803
Daniel Borkmann67cb9362014-06-11 18:19:28 +02001804 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 /*
1806 * Section 3.3.10.3 Stale Cookie Error (3)
1807 *
1808 * Cause of error
1809 * ---------------
1810 * Stale Cookie Error: Indicates the receipt of a valid State
1811 * Cookie that has expired.
1812 */
1813 len = ntohs(chunk->chunk_hdr->length);
1814 *errp = sctp_make_op_error_space(asoc, chunk, len);
1815 if (*errp) {
Daniel Borkmann52db8822013-06-25 18:17:27 +02001816 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
Al Viro34bcca22006-11-20 17:27:15 -08001817 __be32 n = htonl(usecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001820 sizeof(n));
1821 sctp_addto_chunk(*errp, sizeof(n), &n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 *error = -SCTP_IERROR_STALE_COOKIE;
1823 } else
1824 *error = -SCTP_IERROR_NOMEM;
1825
1826 goto fail;
1827 }
1828
1829 /* Make a new base association. */
1830 scope = sctp_scope(sctp_source(chunk));
1831 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1832 if (!retval) {
1833 *error = -SCTP_IERROR_NOMEM;
1834 goto fail;
1835 }
1836
1837 /* Set up our peer's port number. */
1838 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1839
1840 /* Populate the association from the cookie. */
1841 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1842
1843 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1844 GFP_ATOMIC) < 0) {
1845 *error = -SCTP_IERROR_NOMEM;
1846 goto fail;
1847 }
1848
1849 /* Also, add the destination address. */
1850 if (list_empty(&retval->base.bind_addr.address_list)) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08001851 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
Marcelo Ricardo Leitner133800d2016-03-08 10:34:28 -03001852 sizeof(chunk->dest), SCTP_ADDR_SRC,
1853 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 }
1855
1856 retval->next_tsn = retval->c.initial_tsn;
1857 retval->ctsn_ack_point = retval->next_tsn - 1;
1858 retval->addip_serial = retval->c.initial_tsn;
1859 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1860 retval->peer.prsctp_capable = retval->c.prsctp_capable;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001861 retval->peer.adaptation_ind = retval->c.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
1863 /* The INIT stuff will be done by the side effects. */
1864 return retval;
1865
1866fail:
1867 if (retval)
1868 sctp_association_free(retval);
1869
1870 return NULL;
1871
1872malformed:
1873 /* Yikes! The packet is either corrupt or deliberately
1874 * malformed.
1875 */
1876 *error = -SCTP_IERROR_MALFORMED;
1877 goto fail;
1878}
1879
1880/********************************************************************
1881 * 3rd Level Abstractions
1882 ********************************************************************/
1883
1884struct __sctp_missing {
Al Viro9f81bcd2006-11-20 17:26:34 -08001885 __be32 num_missing;
1886 __be16 type;
Eric Dumazetbc105022010-06-03 03:21:52 -07001887} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
1889/*
1890 * Report a missing mandatory parameter.
1891 */
1892static int sctp_process_missing_param(const struct sctp_association *asoc,
1893 sctp_param_t paramtype,
1894 struct sctp_chunk *chunk,
1895 struct sctp_chunk **errp)
1896{
1897 struct __sctp_missing report;
1898 __u16 len;
1899
1900 len = WORD_ROUND(sizeof(report));
1901
1902 /* Make an ERROR chunk, preparing enough room for
1903 * returning multiple unknown parameters.
1904 */
1905 if (!*errp)
1906 *errp = sctp_make_op_error_space(asoc, chunk, len);
1907
1908 if (*errp) {
1909 report.num_missing = htonl(1);
1910 report.type = paramtype;
Vlad Yasevichebdfcad2007-01-15 19:12:31 -08001911 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001912 sizeof(report));
1913 sctp_addto_chunk(*errp, sizeof(report), &report);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 }
1915
1916 /* Stop processing this chunk. */
1917 return 0;
1918}
1919
1920/* Report an Invalid Mandatory Parameter. */
1921static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1922 struct sctp_chunk *chunk,
1923 struct sctp_chunk **errp)
1924{
1925 /* Invalid Mandatory Parameter Error has no payload. */
1926
1927 if (!*errp)
1928 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1929
1930 if (*errp)
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001931 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
1933 /* Stop processing this chunk. */
1934 return 0;
1935}
1936
1937static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1938 struct sctp_paramhdr *param,
1939 const struct sctp_chunk *chunk,
1940 struct sctp_chunk **errp)
1941{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001942 /* This is a fatal error. Any accumulated non-fatal errors are
1943 * not reported.
1944 */
1945 if (*errp)
1946 sctp_chunk_free(*errp);
1947
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 /* Create an error chunk and fill it in with our payload. */
Wei Yongjunba016672008-09-30 05:32:24 -07001949 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950
1951 return 0;
1952}
1953
1954
1955/* Do not attempt to handle the HOST_NAME parm. However, do
1956 * send back an indicator to the peer.
1957 */
1958static int sctp_process_hn_param(const struct sctp_association *asoc,
1959 union sctp_params param,
1960 struct sctp_chunk *chunk,
1961 struct sctp_chunk **errp)
1962{
1963 __u16 len = ntohs(param.p->length);
1964
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001965 /* Processing of the HOST_NAME parameter will generate an
1966 * ABORT. If we've accumulated any non-fatal errors, they
1967 * would be unrecognized parameters and we should not include
1968 * them in the ABORT.
1969 */
1970 if (*errp)
1971 sctp_chunk_free(*errp);
1972
1973 *errp = sctp_make_op_error_space(asoc, chunk, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001975 if (*errp) {
1976 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1977 sctp_addto_chunk(*errp, len, param.v);
1978 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
1980 /* Stop processing this chunk. */
1981 return 0;
1982}
1983
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00001984static int sctp_verify_ext_param(struct net *net, union sctp_params param)
Vlad Yasevichd6701192007-12-20 14:13:31 -08001985{
1986 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1987 int have_auth = 0;
1988 int have_asconf = 0;
1989 int i;
1990
1991 for (i = 0; i < num_ext; i++) {
1992 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08001993 case SCTP_CID_AUTH:
1994 have_auth = 1;
1995 break;
1996 case SCTP_CID_ASCONF:
1997 case SCTP_CID_ASCONF_ACK:
1998 have_asconf = 1;
1999 break;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002000 }
2001 }
2002
2003 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2004 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2005 * only if ADD-IP is turned on and we are not backward-compatible
2006 * mode.
2007 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002008 if (net->sctp.addip_noauth)
Vlad Yasevichd6701192007-12-20 14:13:31 -08002009 return 1;
2010
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002011 if (net->sctp.addip_enable && !have_auth && have_asconf)
Vlad Yasevichd6701192007-12-20 14:13:31 -08002012 return 0;
2013
2014 return 1;
2015}
2016
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002017static void sctp_process_ext_param(struct sctp_association *asoc,
2018 union sctp_params param)
2019{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002020 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002021 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2022 int i;
2023
2024 for (i = 0; i < num_ext; i++) {
2025 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08002026 case SCTP_CID_FWD_TSN:
2027 if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable)
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002028 asoc->peer.prsctp_capable = 1;
wangweidongf7010e62013-12-23 12:16:52 +08002029 break;
2030 case SCTP_CID_AUTH:
2031 /* if the peer reports AUTH, assume that he
2032 * supports AUTH.
2033 */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002034 if (asoc->ep->auth_enable)
wangweidongf7010e62013-12-23 12:16:52 +08002035 asoc->peer.auth_capable = 1;
2036 break;
2037 case SCTP_CID_ASCONF:
2038 case SCTP_CID_ASCONF_ACK:
2039 if (net->sctp.addip_enable)
2040 asoc->peer.asconf_capable = 1;
2041 break;
2042 default:
2043 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002044 }
2045 }
2046}
2047
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048/* RFC 3.2.1 & the Implementers Guide 2.2.
2049 *
2050 * The Parameter Types are encoded such that the
2051 * highest-order two bits specify the action that must be
2052 * taken if the processing endpoint does not recognize the
2053 * Parameter Type.
2054 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002055 * 00 - Stop processing this parameter; do not process any further
2056 * parameters within this chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002058 * 01 - Stop processing this parameter, do not process any further
2059 * parameters within this chunk, and report the unrecognized
2060 * parameter in an 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 *
2062 * 10 - Skip this parameter and continue processing.
2063 *
2064 * 11 - Skip this parameter and continue processing but
2065 * report the unrecognized parameter in an
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002066 * 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 *
2068 * Return value:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002069 * SCTP_IERROR_NO_ERROR - continue with the chunk
2070 * SCTP_IERROR_ERROR - stop and report an error.
2071 * SCTP_IERROR_NOMEME - out of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002073static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2074 union sctp_params param,
2075 struct sctp_chunk *chunk,
2076 struct sctp_chunk **errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002078 int retval = SCTP_IERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079
2080 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2081 case SCTP_PARAM_ACTION_DISCARD:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002082 retval = SCTP_IERROR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 break;
2084 case SCTP_PARAM_ACTION_SKIP:
2085 break;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002086 case SCTP_PARAM_ACTION_DISCARD_ERR:
2087 retval = SCTP_IERROR_ERROR;
2088 /* Fall through */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 case SCTP_PARAM_ACTION_SKIP_ERR:
2090 /* Make an ERROR chunk, preparing enough room for
2091 * returning multiple unknown parameters.
2092 */
2093 if (NULL == *errp)
Neil Horman5fa782c2010-04-28 10:30:59 +00002094 *errp = sctp_make_op_error_fixed(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095
2096 if (*errp) {
Jiri Bohac2205a6e2011-02-17 13:12:08 +00002097 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2098 WORD_ROUND(ntohs(param.p->length))))
2099 sctp_addto_chunk_fixed(*errp,
2100 WORD_ROUND(ntohs(param.p->length)),
2101 param.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 } else {
2103 /* If there is no memory for generating the ERROR
2104 * report as specified, an ABORT will be triggered
2105 * to the peer and the association won't be
2106 * established.
2107 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002108 retval = SCTP_IERROR_NOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 break;
2111 default:
2112 break;
2113 }
2114
2115 return retval;
2116}
2117
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002118/* Verify variable length parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 * Return values:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002120 * SCTP_IERROR_ABORT - trigger an ABORT
2121 * SCTP_IERROR_NOMEM - out of memory (abort)
2122 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2123 * SCTP_IERROR_NO_ERROR - continue with the chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 */
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002125static sctp_ierror_t sctp_verify_param(struct net *net,
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002126 const struct sctp_endpoint *ep,
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002127 const struct sctp_association *asoc,
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002128 union sctp_params param,
2129 sctp_cid_t cid,
2130 struct sctp_chunk *chunk,
2131 struct sctp_chunk **err_chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132{
Wei Yongjun72da7b32008-04-12 18:39:19 -07002133 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002134 int retval = SCTP_IERROR_NO_ERROR;
Wei Yongjun72da7b32008-04-12 18:39:19 -07002135 __u16 n_elt, id = 0;
2136 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137
2138 /* FIXME - This routine is not looking at each parameter per the
2139 * chunk type, i.e., unrecognized parameters should be further
2140 * identified based on the chunk id.
2141 */
2142
2143 switch (param.p->type) {
2144 case SCTP_PARAM_IPV4_ADDRESS:
2145 case SCTP_PARAM_IPV6_ADDRESS:
2146 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2147 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2148 case SCTP_PARAM_STATE_COOKIE:
2149 case SCTP_PARAM_HEARTBEAT_INFO:
2150 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2151 case SCTP_PARAM_ECN_CAPABLE:
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002152 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yasevichd6701192007-12-20 14:13:31 -08002153 break;
2154
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002155 case SCTP_PARAM_SUPPORTED_EXT:
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002156 if (!sctp_verify_ext_param(net, param))
Vlad Yasevichd6701192007-12-20 14:13:31 -08002157 return SCTP_IERROR_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 break;
2159
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002160 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002161 if (net->sctp.addip_enable)
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002162 break;
2163 goto fallthrough;
2164
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 case SCTP_PARAM_HOST_NAME_ADDRESS:
2166 /* Tell the peer, we won't support this param. */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002167 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2168 retval = SCTP_IERROR_ABORT;
2169 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002170
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 case SCTP_PARAM_FWD_TSN_SUPPORT:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002172 if (net->sctp.prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002174 goto fallthrough;
2175
2176 case SCTP_PARAM_RANDOM:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002177 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002178 goto fallthrough;
2179
2180 /* SCTP-AUTH: Secion 6.1
2181 * If the random number is not 32 byte long the association
2182 * MUST be aborted. The ABORT chunk SHOULD contain the error
2183 * cause 'Protocol Violation'.
2184 */
2185 if (SCTP_AUTH_RANDOM_LENGTH !=
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002186 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2187 sctp_process_inv_paramlength(asoc, param.p,
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002188 chunk, err_chunk);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002189 retval = SCTP_IERROR_ABORT;
2190 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002191 break;
2192
2193 case SCTP_PARAM_CHUNKS:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002194 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002195 goto fallthrough;
2196
2197 /* SCTP-AUTH: Section 3.2
2198 * The CHUNKS parameter MUST be included once in the INIT or
2199 * INIT-ACK chunk if the sender wants to receive authenticated
2200 * chunks. Its maximum length is 260 bytes.
2201 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002202 if (260 < ntohs(param.p->length)) {
2203 sctp_process_inv_paramlength(asoc, param.p,
2204 chunk, err_chunk);
2205 retval = SCTP_IERROR_ABORT;
2206 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002207 break;
2208
2209 case SCTP_PARAM_HMAC_ALGO:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002210 if (!ep->auth_enable)
Wei Yongjun72da7b32008-04-12 18:39:19 -07002211 goto fallthrough;
2212
2213 hmacs = (struct sctp_hmac_algo_param *)param.p;
2214 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2215
2216 /* SCTP-AUTH: Section 6.1
2217 * The HMAC algorithm based on SHA-1 MUST be supported and
2218 * included in the HMAC-ALGO parameter.
2219 */
2220 for (i = 0; i < n_elt; i++) {
2221 id = ntohs(hmacs->hmac_ids[i]);
2222
2223 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2224 break;
2225 }
2226
2227 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2228 sctp_process_inv_paramlength(asoc, param.p, chunk,
2229 err_chunk);
2230 retval = SCTP_IERROR_ABORT;
2231 }
2232 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002233fallthrough:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 default:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002235 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2236 __func__, ntohs(param.p->type), cid);
2237
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002238 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 break;
2240 }
2241 return retval;
2242}
2243
2244/* Verify the INIT packet before we process it. */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002245int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2246 const struct sctp_association *asoc, sctp_cid_t cid,
2247 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 struct sctp_chunk **errp)
2249{
2250 union sctp_params param;
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002251 bool has_cookie = false;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002252 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002254 /* Check for missing mandatory parameters. Note: Initial TSN is
2255 * also mandatory, but is not checked here since the valid range
2256 * is 0..2**32-1. RFC4960, section 3.3.3.
2257 */
2258 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2259 peer_init->init_hdr.num_inbound_streams == 0 ||
2260 peer_init->init_hdr.init_tag == 0 ||
2261 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002262 return sctp_process_inv_mandatory(asoc, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 sctp_walk_params(param, peer_init, init_hdr.params) {
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002265 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2266 has_cookie = true;
2267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268
2269 /* There is a possibility that a parameter length was bad and
2270 * in that case we would have stoped walking the parameters.
2271 * The current param.p would point at the bad one.
2272 * Current consensus on the mailing list is to generate a PROTOCOL
2273 * VIOLATION error. We build the ERROR chunk here and let the normal
2274 * error handling code build and send the packet.
2275 */
wangweidong26ac8e52013-12-23 12:16:51 +08002276 if (param.v != (void *)chunk->chunk_end)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002277 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278
2279 /* The only missing mandatory param possible today is
2280 * the state cookie for an INIT-ACK chunk.
2281 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002282 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2283 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2284 chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002286 /* Verify all the variable length parameters */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 sctp_walk_params(param, peer_init, init_hdr.params) {
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002288 result = sctp_verify_param(net, ep, asoc, param, cid,
2289 chunk, errp);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002290 switch (result) {
wangweidongf7010e62013-12-23 12:16:52 +08002291 case SCTP_IERROR_ABORT:
2292 case SCTP_IERROR_NOMEM:
2293 return 0;
2294 case SCTP_IERROR_ERROR:
2295 return 1;
2296 case SCTP_IERROR_NO_ERROR:
2297 default:
2298 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 }
2300
2301 } /* for (loop through all parameters) */
2302
2303 return 1;
2304}
2305
2306/* Unpack the parameters in an INIT packet into an association.
2307 * Returns 0 on failure, else success.
2308 * FIXME: This is an association method.
2309 */
Wei Yongjunde6becd2011-04-19 21:30:51 +00002310int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002312 sctp_init_chunk_t *peer_init, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002314 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 union sctp_params param;
2316 struct sctp_transport *transport;
2317 struct list_head *pos, *temp;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002318 struct sctp_af *af;
2319 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320 char *cookie;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002321 int src_match = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322
2323 /* We must include the address that the INIT packet came from.
2324 * This is the only address that matters for an INIT packet.
2325 * When processing a COOKIE ECHO, we retrieve the from address
2326 * of the INIT from the cookie.
2327 */
2328
2329 /* This implementation defaults to making the first transport
2330 * added as the primary transport. The source address seems to
2331 * be a a better choice than any of the embedded addresses.
2332 */
wangweidongcb3f8372013-12-23 12:16:50 +08002333 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
Wei Yongjunde6becd2011-04-19 21:30:51 +00002334 goto nomem;
2335
2336 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2337 src_match = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338
2339 /* Process the initialization parameters. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 sctp_walk_params(param, peer_init, init_hdr.params) {
Wei Yongjunde6becd2011-04-19 21:30:51 +00002341 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2342 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2343 af = sctp_get_af_specific(param_type2af(param.p->type));
2344 af->from_addr_param(&addr, param.addr,
2345 chunk->sctp_hdr->source, 0);
2346 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2347 src_match = 1;
2348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349
2350 if (!sctp_process_param(asoc, param, peer_addr, gfp))
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002351 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 }
2353
Wei Yongjunde6becd2011-04-19 21:30:51 +00002354 /* source address of chunk may not match any valid address */
2355 if (!src_match)
2356 goto clean_up;
2357
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002358 /* AUTH: After processing the parameters, make sure that we
2359 * have all the required info to potentially do authentications.
2360 */
2361 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2362 !asoc->peer.peer_hmacs))
2363 asoc->peer.auth_capable = 0;
2364
Vlad Yasevichd6701192007-12-20 14:13:31 -08002365 /* In a non-backward compatible mode, if the peer claims
2366 * support for ADD-IP but not AUTH, the ADD-IP spec states
2367 * that we MUST ABORT the association. Section 6. The section
2368 * also give us an option to silently ignore the packet, which
2369 * is what we'll do here.
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002370 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002371 if (!net->sctp.addip_noauth &&
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04002372 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002373 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2374 SCTP_PARAM_DEL_IP |
2375 SCTP_PARAM_SET_PRIMARY);
Vlad Yasevich88799fe2007-10-24 17:24:23 -04002376 asoc->peer.asconf_capable = 0;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002377 goto clean_up;
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002378 }
2379
Frank Filz3f7a87d2005-06-20 13:14:57 -07002380 /* Walk list of transports, removing transports in the UNKNOWN state. */
2381 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2382 transport = list_entry(pos, struct sctp_transport, transports);
2383 if (transport->state == SCTP_UNKNOWN) {
2384 sctp_assoc_rm_peer(asoc, transport);
2385 }
2386 }
2387
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388 /* The fixed INIT headers are always in network byte
2389 * order.
2390 */
2391 asoc->peer.i.init_tag =
2392 ntohl(peer_init->init_hdr.init_tag);
2393 asoc->peer.i.a_rwnd =
2394 ntohl(peer_init->init_hdr.a_rwnd);
2395 asoc->peer.i.num_outbound_streams =
2396 ntohs(peer_init->init_hdr.num_outbound_streams);
2397 asoc->peer.i.num_inbound_streams =
2398 ntohs(peer_init->init_hdr.num_inbound_streams);
2399 asoc->peer.i.initial_tsn =
2400 ntohl(peer_init->init_hdr.initial_tsn);
2401
2402 /* Apply the upper bounds for output streams based on peer's
2403 * number of inbound streams.
2404 */
2405 if (asoc->c.sinit_num_ostreams >
2406 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2407 asoc->c.sinit_num_ostreams =
2408 ntohs(peer_init->init_hdr.num_inbound_streams);
2409 }
2410
2411 if (asoc->c.sinit_max_instreams >
2412 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2413 asoc->c.sinit_max_instreams =
2414 ntohs(peer_init->init_hdr.num_outbound_streams);
2415 }
2416
2417 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2418 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2419
2420 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2421 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2422
2423 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2424 cookie = asoc->peer.cookie;
2425 if (cookie) {
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02002426 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 if (!asoc->peer.cookie)
2428 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429 }
2430
2431 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2432 * high (for example, implementations MAY use the size of the receiver
2433 * advertised window).
2434 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002435 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2436 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 transport->ssthresh = asoc->peer.i.a_rwnd;
2438 }
2439
2440 /* Set up the TSN tracking pieces. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07002441 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2442 asoc->peer.i.initial_tsn, gfp))
2443 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002444
2445 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2446 *
2447 * The stream sequence number in all the streams shall start
2448 * from 0 when the association is established. Also, when the
2449 * stream sequence number reaches the value 65535 the next
2450 * stream sequence number shall be set to 0.
2451 */
2452
Frank Filz3f7a87d2005-06-20 13:14:57 -07002453 /* Allocate storage for the negotiated streams if it is not a temporary
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002454 * association.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455 */
2456 if (!asoc->temp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 int error;
2458
2459 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2460 asoc->c.sinit_num_ostreams, gfp);
2461 if (!asoc->ssnmap)
2462 goto clean_up;
2463
Vlad Yasevich07d93962007-05-04 13:55:27 -07002464 error = sctp_assoc_set_id(asoc, gfp);
2465 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 }
2468
2469 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2470 *
2471 * When an endpoint has an ASCONF signaled change to be sent to the
2472 * remote endpoint it should do the following:
2473 * ...
2474 * A2) A serial number should be assigned to the Chunk. The serial
2475 * number should be a monotonically increasing number. All serial
2476 * numbers are defined to be initialized at the start of the
2477 * association to the same value as the Initial TSN.
2478 */
2479 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2480 return 1;
2481
2482clean_up:
2483 /* Release the transport structures. */
2484 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2485 transport = list_entry(pos, struct sctp_transport, transports);
Vlad Yasevichadd52372008-09-18 16:28:27 -07002486 if (transport->state != SCTP_ACTIVE)
2487 sctp_assoc_rm_peer(asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07002489
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490nomem:
2491 return 0;
2492}
2493
2494
2495/* Update asoc with the option described in param.
2496 *
2497 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2498 *
2499 * asoc is the association to update.
2500 * param is the variable length parameter to use for update.
2501 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2502 * If the current packet is an INIT we want to minimize the amount of
2503 * work we do. In particular, we should not build transport
2504 * structures for the addresses.
2505 */
2506static int sctp_process_param(struct sctp_association *asoc,
2507 union sctp_params param,
2508 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002509 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510{
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002511 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 union sctp_addr addr;
2513 int i;
2514 __u16 sat;
2515 int retval = 1;
2516 sctp_scope_t scope;
Arnd Bergmann3ef0a252015-09-30 13:26:40 +02002517 u32 stale;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 struct sctp_af *af;
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002519 union sctp_addr_param *addr_param;
2520 struct sctp_transport *t;
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002521 struct sctp_endpoint *ep = asoc->ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522
2523 /* We maintain all INIT parameters in network byte order all the
2524 * time. This allows us to not worry about whether the parameters
2525 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2526 */
2527 switch (param.p->type) {
2528 case SCTP_PARAM_IPV6_ADDRESS:
2529 if (PF_INET6 != asoc->base.sk->sk_family)
2530 break;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002531 goto do_addr_param;
2532
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533 case SCTP_PARAM_IPV4_ADDRESS:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002534 /* v4 addresses are not allowed on v6-only socket */
2535 if (ipv6_only_sock(asoc->base.sk))
2536 break;
2537do_addr_param:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 af = sctp_get_af_specific(param_type2af(param.p->type));
Al Virodd86d132006-11-20 17:11:13 -08002539 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 scope = sctp_scope(peer_addr);
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002541 if (sctp_in_scope(net, &addr, scope))
Al Virodd86d132006-11-20 17:11:13 -08002542 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543 return 0;
2544 break;
2545
2546 case SCTP_PARAM_COOKIE_PRESERVATIVE:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002547 if (!net->sctp.cookie_preserve_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548 break;
2549
2550 stale = ntohl(param.life->lifespan_increment);
2551
2552 /* Suggested Cookie Life span increment's unit is msec,
2553 * (1/1000sec).
2554 */
Daniel Borkmann52db8822013-06-25 18:17:27 +02002555 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002556 break;
2557
2558 case SCTP_PARAM_HOST_NAME_ADDRESS:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002559 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 break;
2561
2562 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2563 /* Turn off the default values first so we'll know which
2564 * ones are really set by the peer.
2565 */
2566 asoc->peer.ipv4_address = 0;
2567 asoc->peer.ipv6_address = 0;
2568
Gui Jianfeng140ee962008-03-05 13:43:32 -08002569 /* Assume that peer supports the address family
2570 * by which it sends a packet.
2571 */
2572 if (peer_addr->sa.sa_family == AF_INET6)
2573 asoc->peer.ipv6_address = 1;
2574 else if (peer_addr->sa.sa_family == AF_INET)
2575 asoc->peer.ipv4_address = 1;
2576
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 /* Cycle through address types; avoid divide by 0. */
2578 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2579 if (sat)
2580 sat /= sizeof(__u16);
2581
2582 for (i = 0; i < sat; ++i) {
2583 switch (param.sat->types[i]) {
2584 case SCTP_PARAM_IPV4_ADDRESS:
2585 asoc->peer.ipv4_address = 1;
2586 break;
2587
2588 case SCTP_PARAM_IPV6_ADDRESS:
Wei Yongjun6e40a912008-05-09 15:11:17 -07002589 if (PF_INET6 == asoc->base.sk->sk_family)
2590 asoc->peer.ipv6_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 break;
2592
2593 case SCTP_PARAM_HOST_NAME_ADDRESS:
2594 asoc->peer.hostname_address = 1;
2595 break;
2596
2597 default: /* Just ignore anything else. */
2598 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002599 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600 }
2601 break;
2602
2603 case SCTP_PARAM_STATE_COOKIE:
2604 asoc->peer.cookie_len =
2605 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2606 asoc->peer.cookie = param.cookie->body;
2607 break;
2608
2609 case SCTP_PARAM_HEARTBEAT_INFO:
2610 /* Would be odd to receive, but it causes no problems. */
2611 break;
2612
2613 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2614 /* Rejected during verify stage. */
2615 break;
2616
2617 case SCTP_PARAM_ECN_CAPABLE:
2618 asoc->peer.ecn_capable = 1;
2619 break;
2620
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002621 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yaseviche69c4e02008-09-15 16:29:49 -04002622 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002623 break;
2624
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002625 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002626 if (!net->sctp.addip_enable)
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07002627 goto fall_through;
2628
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002629 addr_param = param.v + sizeof(sctp_addip_param_t);
2630
Saran Maruti Ramanaracfbf6542015-01-29 11:05:58 +01002631 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Daniel Borkmanne40607c2014-11-10 17:54:26 +01002632 if (af == NULL)
2633 break;
2634
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002635 af->from_addr_param(&addr, addr_param,
2636 htons(asoc->peer.port), 0);
2637
2638 /* if the address is invalid, we can't process it.
2639 * XXX: see spec for what to do.
2640 */
2641 if (!af->addr_valid(&addr, NULL, NULL))
2642 break;
2643
2644 t = sctp_assoc_lookup_paddr(asoc, &addr);
2645 if (!t)
2646 break;
2647
2648 sctp_assoc_set_primary(asoc, t);
2649 break;
2650
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002651 case SCTP_PARAM_SUPPORTED_EXT:
2652 sctp_process_ext_param(asoc, param);
2653 break;
2654
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655 case SCTP_PARAM_FWD_TSN_SUPPORT:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002656 if (net->sctp.prsctp_enable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 asoc->peer.prsctp_capable = 1;
2658 break;
2659 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002660 /* Fall Through */
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002661 goto fall_through;
2662
2663 case SCTP_PARAM_RANDOM:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002664 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002665 goto fall_through;
2666
2667 /* Save peer's random parameter */
2668 asoc->peer.peer_random = kmemdup(param.p,
2669 ntohs(param.p->length), gfp);
2670 if (!asoc->peer.peer_random) {
2671 retval = 0;
2672 break;
2673 }
2674 break;
2675
2676 case SCTP_PARAM_HMAC_ALGO:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002677 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002678 goto fall_through;
2679
2680 /* Save peer's HMAC list */
2681 asoc->peer.peer_hmacs = kmemdup(param.p,
2682 ntohs(param.p->length), gfp);
2683 if (!asoc->peer.peer_hmacs) {
2684 retval = 0;
2685 break;
2686 }
2687
2688 /* Set the default HMAC the peer requested*/
2689 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2690 break;
2691
2692 case SCTP_PARAM_CHUNKS:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002693 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002694 goto fall_through;
2695
2696 asoc->peer.peer_chunks = kmemdup(param.p,
2697 ntohs(param.p->length), gfp);
2698 if (!asoc->peer.peer_chunks)
2699 retval = 0;
2700 break;
2701fall_through:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702 default:
2703 /* Any unrecognized parameters should have been caught
2704 * and handled by sctp_verify_param() which should be
2705 * called prior to this routine. Simply log the error
2706 * here.
2707 */
Daniel Borkmannbb333812013-06-28 19:49:40 +02002708 pr_debug("%s: ignoring param:%d for association:%p.\n",
2709 __func__, ntohs(param.p->type), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712
2713 return retval;
2714}
2715
2716/* Select a new verification tag. */
2717__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2718{
2719 /* I believe that this random number generator complies with RFC1750.
2720 * A tag of 0 is reserved for special cases (e.g. INIT).
2721 */
2722 __u32 x;
2723
2724 do {
2725 get_random_bytes(&x, sizeof(__u32));
2726 } while (x == 0);
2727
2728 return x;
2729}
2730
2731/* Select an initial TSN to send during startup. */
2732__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2733{
2734 __u32 retval;
2735
2736 get_random_bytes(&retval, sizeof(__u32));
2737 return retval;
2738}
2739
2740/*
2741 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2742 * 0 1 2 3
2743 * 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
2744 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2746 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * | Serial Number |
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * | Address Parameter |
2750 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2751 * | ASCONF Parameter #1 |
2752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * \ \
2754 * / .... /
2755 * \ \
2756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2757 * | ASCONF Parameter #N |
2758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2759 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002760 * Address Parameter and other parameter will not be wrapped in this function
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 */
2762static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2763 union sctp_addr *addr,
2764 int vparam_len)
2765{
2766 sctp_addiphdr_t asconf;
2767 struct sctp_chunk *retval;
2768 int length = sizeof(asconf) + vparam_len;
2769 union sctp_addr_param addrparam;
2770 int addrlen;
2771 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2772
2773 addrlen = af->to_addr_param(addr, &addrparam);
2774 if (!addrlen)
2775 return NULL;
2776 length += addrlen;
2777
2778 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03002779 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2780 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781 if (!retval)
2782 return NULL;
2783
2784 asconf.serial = htonl(asoc->addip_serial++);
2785
2786 retval->subh.addip_hdr =
2787 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2788 retval->param_hdr.v =
2789 sctp_addto_chunk(retval, addrlen, &addrparam);
2790
2791 return retval;
2792}
2793
2794/* ADDIP
2795 * 3.2.1 Add IP Address
2796 * 0 1 2 3
2797 * 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
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | Type = 0xC001 | Length = Variable |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2801 * | ASCONF-Request Correlation ID |
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * | Address Parameter |
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 *
2806 * 3.2.2 Delete IP Address
2807 * 0 1 2 3
2808 * 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
2809 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2810 * | Type = 0xC002 | Length = Variable |
2811 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2812 * | ASCONF-Request Correlation ID |
2813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2814 * | Address Parameter |
2815 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2816 *
2817 */
2818struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2819 union sctp_addr *laddr,
2820 struct sockaddr *addrs,
2821 int addrcnt,
Al Virodbc16db2006-11-20 17:01:42 -08002822 __be16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823{
2824 sctp_addip_param_t param;
2825 struct sctp_chunk *retval;
2826 union sctp_addr_param addr_param;
2827 union sctp_addr *addr;
2828 void *addr_buf;
2829 struct sctp_af *af;
2830 int paramlen = sizeof(param);
2831 int addr_param_len = 0;
2832 int totallen = 0;
2833 int i;
Michio Honda8a07eb02011-04-26 20:19:36 +09002834 int del_pickup = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835
2836 /* Get total length of all the address parameters. */
2837 addr_buf = addrs;
2838 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002839 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840 af = sctp_get_af_specific(addr->v4.sin_family);
2841 addr_param_len = af->to_addr_param(addr, &addr_param);
2842
2843 totallen += paramlen;
2844 totallen += addr_param_len;
2845
2846 addr_buf += af->sockaddr_len;
Michio Honda8a07eb02011-04-26 20:19:36 +09002847 if (asoc->asconf_addr_del_pending && !del_pickup) {
2848 /* reuse the parameter length from the same scope one */
2849 totallen += paramlen;
2850 totallen += addr_param_len;
2851 del_pickup = 1;
Daniel Borkmannbb333812013-06-28 19:49:40 +02002852
2853 pr_debug("%s: picked same-scope del_pending addr, "
2854 "totallen for all addresses is %d\n",
2855 __func__, totallen);
Michio Honda8a07eb02011-04-26 20:19:36 +09002856 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857 }
2858
2859 /* Create an asconf chunk with the required length. */
2860 retval = sctp_make_asconf(asoc, laddr, totallen);
2861 if (!retval)
2862 return NULL;
2863
2864 /* Add the address parameters to the asconf chunk. */
2865 addr_buf = addrs;
2866 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002867 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868 af = sctp_get_af_specific(addr->v4.sin_family);
2869 addr_param_len = af->to_addr_param(addr, &addr_param);
2870 param.param_hdr.type = flags;
2871 param.param_hdr.length = htons(paramlen + addr_param_len);
2872 param.crr_id = i;
2873
2874 sctp_addto_chunk(retval, paramlen, &param);
2875 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2876
2877 addr_buf += af->sockaddr_len;
2878 }
Michio Honda8a07eb02011-04-26 20:19:36 +09002879 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2880 addr = asoc->asconf_addr_del_pending;
2881 af = sctp_get_af_specific(addr->v4.sin_family);
2882 addr_param_len = af->to_addr_param(addr, &addr_param);
2883 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2884 param.param_hdr.length = htons(paramlen + addr_param_len);
2885 param.crr_id = i;
2886
2887 sctp_addto_chunk(retval, paramlen, &param);
2888 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2889 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890 return retval;
2891}
2892
2893/* ADDIP
2894 * 3.2.4 Set Primary IP Address
2895 * 0 1 2 3
2896 * 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
2897 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2898 * | Type =0xC004 | Length = Variable |
2899 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2900 * | ASCONF-Request Correlation ID |
2901 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2902 * | Address Parameter |
2903 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2904 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002905 * Create an ASCONF chunk with Set Primary IP address parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906 */
2907struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2908 union sctp_addr *addr)
2909{
2910 sctp_addip_param_t param;
2911 struct sctp_chunk *retval;
2912 int len = sizeof(param);
2913 union sctp_addr_param addrparam;
2914 int addrlen;
2915 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2916
2917 addrlen = af->to_addr_param(addr, &addrparam);
2918 if (!addrlen)
2919 return NULL;
2920 len += addrlen;
2921
2922 /* Create the chunk and make asconf header. */
2923 retval = sctp_make_asconf(asoc, addr, len);
2924 if (!retval)
2925 return NULL;
2926
2927 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2928 param.param_hdr.length = htons(len);
2929 param.crr_id = 0;
2930
2931 sctp_addto_chunk(retval, sizeof(param), &param);
2932 sctp_addto_chunk(retval, addrlen, &addrparam);
2933
2934 return retval;
2935}
2936
2937/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2938 * 0 1 2 3
2939 * 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
2940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2941 * | Type = 0x80 | Chunk Flags | Chunk Length |
2942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2943 * | Serial Number |
2944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2945 * | ASCONF Parameter Response#1 |
2946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * \ \
2948 * / .... /
2949 * \ \
2950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2951 * | ASCONF Parameter Response#N |
2952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2953 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002954 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955 */
2956static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2957 __u32 serial, int vparam_len)
2958{
2959 sctp_addiphdr_t asconf;
2960 struct sctp_chunk *retval;
2961 int length = sizeof(asconf) + vparam_len;
2962
2963 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03002964 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2965 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966 if (!retval)
2967 return NULL;
2968
2969 asconf.serial = htonl(serial);
2970
2971 retval->subh.addip_hdr =
2972 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2973
2974 return retval;
2975}
2976
2977/* Add response parameters to an ASCONF_ACK chunk. */
Al Viro9f81bcd2006-11-20 17:26:34 -08002978static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
Al Virodbc16db2006-11-20 17:01:42 -08002979 __be16 err_code, sctp_addip_param_t *asconf_param)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980{
2981 sctp_addip_param_t ack_param;
2982 sctp_errhdr_t err_param;
2983 int asconf_param_len = 0;
2984 int err_param_len = 0;
Al Virodbc16db2006-11-20 17:01:42 -08002985 __be16 response_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986
2987 if (SCTP_ERROR_NO_ERROR == err_code) {
2988 response_type = SCTP_PARAM_SUCCESS_REPORT;
2989 } else {
2990 response_type = SCTP_PARAM_ERR_CAUSE;
2991 err_param_len = sizeof(err_param);
2992 if (asconf_param)
2993 asconf_param_len =
2994 ntohs(asconf_param->param_hdr.length);
2995 }
2996
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002997 /* Add Success Indication or Error Cause Indication parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998 ack_param.param_hdr.type = response_type;
2999 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3000 err_param_len +
3001 asconf_param_len);
3002 ack_param.crr_id = crr_id;
3003 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3004
3005 if (SCTP_ERROR_NO_ERROR == err_code)
3006 return;
3007
3008 /* Add Error Cause parameter. */
3009 err_param.cause = err_code;
3010 err_param.length = htons(err_param_len + asconf_param_len);
3011 sctp_addto_chunk(chunk, err_param_len, &err_param);
3012
3013 /* Add the failed TLV copied from ASCONF chunk. */
3014 if (asconf_param)
3015 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3016}
3017
3018/* Process a asconf parameter. */
Al Virodbc16db2006-11-20 17:01:42 -08003019static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 struct sctp_chunk *asconf,
3021 sctp_addip_param_t *asconf_param)
3022{
3023 struct sctp_transport *peer;
3024 struct sctp_af *af;
3025 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 union sctp_addr_param *addr_param;
Al Viro5f242a12006-11-20 17:05:23 -08003027
Joe Perchesea110732011-06-13 16:21:26 +00003028 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Patrick McHardyc1cc6782008-05-13 23:25:00 -07003029
Wei Yongjun44e65c12009-06-16 14:48:24 +08003030 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3031 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3032 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3033 return SCTP_ERROR_UNKNOWN_PARAM;
3034
Shan Wei6a435732011-04-18 19:11:47 +00003035 switch (addr_param->p.type) {
Wei Yongjunc4492582008-05-09 15:11:53 -07003036 case SCTP_PARAM_IPV6_ADDRESS:
3037 if (!asoc->peer.ipv6_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003038 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003039 break;
3040 case SCTP_PARAM_IPV4_ADDRESS:
3041 if (!asoc->peer.ipv4_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003042 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003043 break;
3044 default:
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003045 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003046 }
3047
Shan Wei6a435732011-04-18 19:11:47 +00003048 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 if (unlikely(!af))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003050 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051
Al Virodd86d132006-11-20 17:11:13 -08003052 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003053
3054 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3055 * or multicast address.
3056 * (note: wildcard is permitted and requires special handling so
3057 * make sure we check for that)
3058 */
3059 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003060 return SCTP_ERROR_DNS_FAILED;
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003061
Linus Torvalds1da177e2005-04-16 15:20:36 -07003062 switch (asconf_param->param_hdr.type) {
3063 case SCTP_PARAM_ADD_IP:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003064 /* Section 4.2.1:
3065 * If the address 0.0.0.0 or ::0 is provided, the source
3066 * address of the packet MUST be added.
3067 */
3068 if (af->is_any(&addr))
3069 memcpy(&addr, &asconf->source, sizeof(addr));
3070
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003072 * request and does not have the local resources to add this
3073 * new address to the association, it MUST return an Error
3074 * Cause TLV set to the new error code 'Operation Refused
3075 * Due to Resource Shortage'.
3076 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003077
Al Virodd86d132006-11-20 17:11:13 -08003078 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079 if (!peer)
3080 return SCTP_ERROR_RSRC_LOW;
3081
3082 /* Start the heartbeat timer. */
Marcelo Ricardo Leitnerba6f5e32016-04-06 15:15:19 -03003083 sctp_transport_reset_hb_timer(peer);
Michio Honda6af29cc2011-06-16 17:14:34 +09003084 asoc->new_transport = peer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 break;
3086 case SCTP_PARAM_DEL_IP:
3087 /* ADDIP 4.3 D7) If a request is received to delete the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003088 * last remaining IP address of a peer endpoint, the receiver
3089 * MUST send an Error Cause TLV with the error cause set to the
3090 * new error code 'Request to Delete Last Remaining IP Address'.
3091 */
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003092 if (asoc->peer.transport_count == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003093 return SCTP_ERROR_DEL_LAST_IP;
3094
3095 /* ADDIP 4.3 D8) If a request is received to delete an IP
3096 * address which is also the source address of the IP packet
3097 * which contained the ASCONF chunk, the receiver MUST reject
3098 * this request. To reject the request the receiver MUST send
3099 * an Error Cause TLV set to the new error code 'Request to
3100 * Delete Source IP Address'
3101 */
Michio Hondab1364102011-04-26 17:37:02 +09003102 if (sctp_cmp_addr_exact(&asconf->source, &addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103 return SCTP_ERROR_DEL_SRC_IP;
3104
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003105 /* Section 4.2.2
3106 * If the address 0.0.0.0 or ::0 is provided, all
3107 * addresses of the peer except the source address of the
3108 * packet MUST be deleted.
3109 */
3110 if (af->is_any(&addr)) {
3111 sctp_assoc_set_primary(asoc, asconf->transport);
3112 sctp_assoc_del_nonprimary_peers(asoc,
3113 asconf->transport);
lucien7c5a9462015-08-28 17:45:58 +08003114 return SCTP_ERROR_NO_ERROR;
3115 }
3116
3117 /* If the address is not part of the association, the
3118 * ASCONF-ACK with Error Cause Indication Parameter
3119 * which including cause of Unresolvable Address should
3120 * be sent.
3121 */
3122 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3123 if (!peer)
3124 return SCTP_ERROR_DNS_FAILED;
3125
3126 sctp_assoc_rm_peer(asoc, peer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003127 break;
3128 case SCTP_PARAM_SET_PRIMARY:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003129 /* ADDIP Section 4.2.4
3130 * If the address 0.0.0.0 or ::0 is provided, the receiver
3131 * MAY mark the source address of the packet as its
3132 * primary.
3133 */
3134 if (af->is_any(&addr))
3135 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3136
Al Virodd86d132006-11-20 17:11:13 -08003137 peer = sctp_assoc_lookup_paddr(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003138 if (!peer)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003139 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003140
3141 sctp_assoc_set_primary(asoc, peer);
3142 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 }
3144
3145 return SCTP_ERROR_NO_ERROR;
3146}
3147
Daniel Borkmann9de79222014-10-09 22:55:31 +02003148/* Verify the ASCONF packet before we process it. */
3149bool sctp_verify_asconf(const struct sctp_association *asoc,
3150 struct sctp_chunk *chunk, bool addr_param_needed,
3151 struct sctp_paramhdr **errp)
3152{
3153 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003154 union sctp_params param;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003155 bool addr_param_seen = false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003156
Daniel Borkmann9de79222014-10-09 22:55:31 +02003157 sctp_walk_params(param, addip, addip_hdr.params) {
3158 size_t length = ntohs(param.p->length);
3159
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003160 *errp = param.p;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003161 switch (param.p->type) {
Daniel Borkmann9de79222014-10-09 22:55:31 +02003162 case SCTP_PARAM_ERR_CAUSE:
3163 break;
3164 case SCTP_PARAM_IPV4_ADDRESS:
3165 if (length != sizeof(sctp_ipv4addr_param_t))
3166 return false;
lucience7b4cc2015-08-27 16:26:34 +08003167 /* ensure there is only one addr param and it's in the
3168 * beginning of addip_hdr params, or we reject it.
3169 */
3170 if (param.v != addip->addip_hdr.params)
3171 return false;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003172 addr_param_seen = true;
3173 break;
3174 case SCTP_PARAM_IPV6_ADDRESS:
3175 if (length != sizeof(sctp_ipv6addr_param_t))
3176 return false;
lucience7b4cc2015-08-27 16:26:34 +08003177 if (param.v != addip->addip_hdr.params)
3178 return false;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003179 addr_param_seen = true;
3180 break;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003181 case SCTP_PARAM_ADD_IP:
3182 case SCTP_PARAM_DEL_IP:
3183 case SCTP_PARAM_SET_PRIMARY:
Daniel Borkmann9de79222014-10-09 22:55:31 +02003184 /* In ASCONF chunks, these need to be first. */
3185 if (addr_param_needed && !addr_param_seen)
3186 return false;
3187 length = ntohs(param.addip->param_hdr.length);
3188 if (length < sizeof(sctp_addip_param_t) +
3189 sizeof(sctp_paramhdr_t))
3190 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003191 break;
3192 case SCTP_PARAM_SUCCESS_REPORT:
3193 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3194 if (length != sizeof(sctp_addip_param_t))
Daniel Borkmann9de79222014-10-09 22:55:31 +02003195 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003196 break;
3197 default:
Daniel Borkmann9de79222014-10-09 22:55:31 +02003198 /* This is unkown to us, reject! */
3199 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003200 }
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003201 }
3202
Daniel Borkmann9de79222014-10-09 22:55:31 +02003203 /* Remaining sanity checks. */
3204 if (addr_param_needed && !addr_param_seen)
3205 return false;
3206 if (!addr_param_needed && addr_param_seen)
3207 return false;
3208 if (param.v != chunk->chunk_end)
3209 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003210
Daniel Borkmann9de79222014-10-09 22:55:31 +02003211 return true;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003212}
3213
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003214/* Process an incoming ASCONF chunk with the next expected serial no. and
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215 * return an ASCONF_ACK chunk to be sent in response.
3216 */
3217struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3218 struct sctp_chunk *asconf)
3219{
Daniel Borkmann9de79222014-10-09 22:55:31 +02003220 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3221 bool all_param_pass = true;
3222 union sctp_params param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003223 sctp_addiphdr_t *hdr;
3224 union sctp_addr_param *addr_param;
3225 sctp_addip_param_t *asconf_param;
3226 struct sctp_chunk *asconf_ack;
Al Virodbc16db2006-11-20 17:01:42 -08003227 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003228 int length = 0;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003229 int chunk_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230 __u32 serial;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003231
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003232 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3234 serial = ntohl(hdr->serial);
3235
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003236 /* Skip the addiphdr and store a pointer to address parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237 length = sizeof(sctp_addiphdr_t);
3238 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3239 chunk_len -= length;
3240
3241 /* Skip the address parameter and store a pointer to the first
Joe Perches7aa1b542007-12-20 14:03:52 -08003242 * asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003243 */
Shan Wei6a435732011-04-18 19:11:47 +00003244 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003245 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003246 chunk_len -= length;
3247
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003248 /* create an ASCONF_ACK chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 * Based on the definitions of parameters, we know that the size of
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003250 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
Joe Perches7aa1b542007-12-20 14:03:52 -08003251 * parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003252 */
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003253 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003254 if (!asconf_ack)
3255 goto done;
3256
3257 /* Process the TLVs contained within the ASCONF chunk. */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003258 sctp_walk_params(param, addip, addip_hdr.params) {
3259 /* Skip preceeding address parameters. */
3260 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3261 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3262 continue;
3263
Linus Torvalds1da177e2005-04-16 15:20:36 -07003264 err_code = sctp_process_asconf_param(asoc, asconf,
Daniel Borkmann9de79222014-10-09 22:55:31 +02003265 param.addip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003266 /* ADDIP 4.1 A7)
3267 * If an error response is received for a TLV parameter,
3268 * all TLVs with no response before the failed TLV are
3269 * considered successful if not reported. All TLVs after
3270 * the failed response are considered unsuccessful unless
3271 * a specific success indication is present for the parameter.
3272 */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003273 if (err_code != SCTP_ERROR_NO_ERROR)
3274 all_param_pass = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003275 if (!all_param_pass)
Daniel Borkmann9de79222014-10-09 22:55:31 +02003276 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3277 err_code, param.addip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003278
3279 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3280 * an IP address sends an 'Out of Resource' in its response, it
3281 * MUST also fail any subsequent add or delete requests bundled
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003282 * in the ASCONF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003283 */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003284 if (err_code == SCTP_ERROR_RSRC_LOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003285 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287done:
3288 asoc->peer.addip_serial++;
3289
3290 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003291 * after freeing the reference to old asconf ack if any.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003292 */
3293 if (asconf_ack) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003294 sctp_chunk_hold(asconf_ack);
Vlad Yasevicha08de642007-12-20 14:11:47 -08003295 list_add_tail(&asconf_ack->transmitted_list,
3296 &asoc->asconf_ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003297 }
3298
3299 return asconf_ack;
3300}
3301
3302/* Process a asconf parameter that is successfully acked. */
Wei Yongjun425e0f62009-06-16 14:47:30 +08003303static void sctp_asconf_param_success(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003304 sctp_addip_param_t *asconf_param)
3305{
3306 struct sctp_af *af;
3307 union sctp_addr addr;
3308 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3309 union sctp_addr_param *addr_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003310 struct sctp_transport *transport;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003311 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003312
Joe Perchesea110732011-06-13 16:21:26 +00003313 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314
3315 /* We have checked the packet before, so we do not check again. */
Shan Wei6a435732011-04-18 19:11:47 +00003316 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Al Virodd86d132006-11-20 17:11:13 -08003317 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003318
3319 switch (asconf_param->param_hdr.type) {
3320 case SCTP_PARAM_ADD_IP:
Vlad Yasevich559cf712007-09-16 16:03:28 -07003321 /* This is always done in BH context with a socket lock
3322 * held, so the list can not change.
3323 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003324 local_bh_disable();
Vlad Yasevich559cf712007-09-16 16:03:28 -07003325 list_for_each_entry(saddr, &bp->address_list, list) {
Al Virodd86d132006-11-20 17:11:13 -08003326 if (sctp_cmp_addr_exact(&saddr->a, &addr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08003327 saddr->state = SCTP_ADDR_SRC;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003328 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003329 local_bh_enable();
Wei Yongjun3cd97492009-06-16 10:07:23 +08003330 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3331 transports) {
Wei Yongjun3cd97492009-06-16 10:07:23 +08003332 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003333 transport->dst = NULL;
Wei Yongjun3cd97492009-06-16 10:07:23 +08003334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003335 break;
3336 case SCTP_PARAM_DEL_IP:
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003337 local_bh_disable();
Wei Yongjun425e0f62009-06-16 14:47:30 +08003338 sctp_del_bind_addr(bp, &addr);
Michio Honda8a07eb02011-04-26 20:19:36 +09003339 if (asoc->asconf_addr_del_pending != NULL &&
3340 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3341 kfree(asoc->asconf_addr_del_pending);
3342 asoc->asconf_addr_del_pending = NULL;
3343 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003344 local_bh_enable();
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07003345 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3346 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003347 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003348 transport->dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349 }
3350 break;
3351 default:
3352 break;
3353 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003354}
3355
3356/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3357 * for the given asconf parameter. If there is no response for this parameter,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003358 * return the error code based on the third argument 'no_err'.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003359 * ADDIP 4.1
3360 * A7) If an error response is received for a TLV parameter, all TLVs with no
3361 * response before the failed TLV are considered successful if not reported.
3362 * All TLVs after the failed response are considered unsuccessful unless a
3363 * specific success indication is present for the parameter.
3364 */
Al Virodbc16db2006-11-20 17:01:42 -08003365static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003366 sctp_addip_param_t *asconf_param,
3367 int no_err)
3368{
3369 sctp_addip_param_t *asconf_ack_param;
3370 sctp_errhdr_t *err_param;
3371 int length;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003372 int asconf_ack_len;
Al Virodbc16db2006-11-20 17:01:42 -08003373 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003374
3375 if (no_err)
3376 err_code = SCTP_ERROR_NO_ERROR;
3377 else
3378 err_code = SCTP_ERROR_REQ_REFUSED;
3379
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003380 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3381 sizeof(sctp_chunkhdr_t);
3382
Linus Torvalds1da177e2005-04-16 15:20:36 -07003383 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3384 * the first asconf_ack parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003385 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003386 length = sizeof(sctp_addiphdr_t);
3387 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3388 length);
3389 asconf_ack_len -= length;
3390
3391 while (asconf_ack_len > 0) {
3392 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
wangweidongcb3f8372013-12-23 12:16:50 +08003393 switch (asconf_ack_param->param_hdr.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003394 case SCTP_PARAM_SUCCESS_REPORT:
3395 return SCTP_ERROR_NO_ERROR;
3396 case SCTP_PARAM_ERR_CAUSE:
3397 length = sizeof(sctp_addip_param_t);
Joe Perchesea110732011-06-13 16:21:26 +00003398 err_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399 asconf_ack_len -= length;
3400 if (asconf_ack_len > 0)
3401 return err_param->cause;
3402 else
3403 return SCTP_ERROR_INV_PARAM;
3404 break;
3405 default:
3406 return SCTP_ERROR_INV_PARAM;
3407 }
3408 }
3409
3410 length = ntohs(asconf_ack_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003411 asconf_ack_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003412 asconf_ack_len -= length;
3413 }
3414
3415 return err_code;
3416}
3417
3418/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3419int sctp_process_asconf_ack(struct sctp_association *asoc,
3420 struct sctp_chunk *asconf_ack)
3421{
3422 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3423 union sctp_addr_param *addr_param;
3424 sctp_addip_param_t *asconf_param;
3425 int length = 0;
3426 int asconf_len = asconf->skb->len;
3427 int all_param_pass = 0;
3428 int no_err = 1;
3429 int retval = 0;
Al Virodbc16db2006-11-20 17:01:42 -08003430 __be16 err_code = SCTP_ERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431
3432 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3433 * a pointer to address parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003434 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003435 length = sizeof(sctp_addip_chunk_t);
3436 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3437 asconf_len -= length;
3438
3439 /* Skip the address parameter in the last asconf sent and store a
Joe Perches7aa1b542007-12-20 14:03:52 -08003440 * pointer to the first asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003441 */
Shan Wei6a435732011-04-18 19:11:47 +00003442 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003443 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003444 asconf_len -= length;
3445
3446 /* ADDIP 4.1
3447 * A8) If there is no response(s) to specific TLV parameter(s), and no
3448 * failures are indicated, then all request(s) are considered
3449 * successful.
3450 */
3451 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3452 all_param_pass = 1;
3453
3454 /* Process the TLVs contained in the last sent ASCONF chunk. */
3455 while (asconf_len > 0) {
3456 if (all_param_pass)
3457 err_code = SCTP_ERROR_NO_ERROR;
3458 else {
3459 err_code = sctp_get_asconf_response(asconf_ack,
3460 asconf_param,
3461 no_err);
3462 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3463 no_err = 0;
3464 }
3465
3466 switch (err_code) {
3467 case SCTP_ERROR_NO_ERROR:
Wei Yongjun425e0f62009-06-16 14:47:30 +08003468 sctp_asconf_param_success(asoc, asconf_param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003469 break;
3470
3471 case SCTP_ERROR_RSRC_LOW:
3472 retval = 1;
3473 break;
3474
Wei Yongjuna987f762009-04-07 15:44:29 +08003475 case SCTP_ERROR_UNKNOWN_PARAM:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003476 /* Disable sending this type of asconf parameter in
3477 * future.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003478 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479 asoc->peer.addip_disabled_mask |=
3480 asconf_param->param_hdr.type;
3481 break;
3482
3483 case SCTP_ERROR_REQ_REFUSED:
3484 case SCTP_ERROR_DEL_LAST_IP:
3485 case SCTP_ERROR_DEL_SRC_IP:
3486 default:
3487 break;
3488 }
3489
3490 /* Skip the processed asconf parameter and move to the next
3491 * one.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003492 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003493 length = ntohs(asconf_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003494 asconf_param = (void *)asconf_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003495 asconf_len -= length;
3496 }
3497
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003498 if (no_err && asoc->src_out_of_asoc_ok) {
Michio Honda8a07eb02011-04-26 20:19:36 +09003499 asoc->src_out_of_asoc_ok = 0;
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003500 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3501 }
Michio Honda8a07eb02011-04-26 20:19:36 +09003502
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 /* Free the cached last sent asconf chunk. */
Vlad Yasevich5f9646c2008-02-05 14:23:44 -05003504 list_del_init(&asconf->transmitted_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003505 sctp_chunk_free(asconf);
3506 asoc->addip_last_asconf = NULL;
3507
Linus Torvalds1da177e2005-04-16 15:20:36 -07003508 return retval;
3509}
3510
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003511/* Make a FWD TSN chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003512struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3513 __u32 new_cum_tsn, size_t nstreams,
3514 struct sctp_fwdtsn_skip *skiplist)
3515{
3516 struct sctp_chunk *retval = NULL;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003517 struct sctp_fwdtsn_hdr ftsn_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003518 struct sctp_fwdtsn_skip skip;
3519 size_t hint;
3520 int i;
3521
3522 hint = (nstreams + 1) * sizeof(__u32);
3523
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03003524 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003525
3526 if (!retval)
3527 return NULL;
3528
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3530 retval->subh.fwdtsn_hdr =
3531 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3532
3533 for (i = 0; i < nstreams; i++) {
3534 skip.stream = skiplist[i].stream;
3535 skip.ssn = skiplist[i].ssn;
3536 sctp_addto_chunk(retval, sizeof(skip), &skip);
3537 }
3538
3539 return retval;
3540}