blob: 8c77b87a8565cb4f82c09cea65557dc9c8d1138f [file] [log] [blame]
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{
Marcelo Ricardo Leitnere7487c82016-07-13 15:08:58 -0300111 struct sk_buff *skb = chunk->skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Marcelo Ricardo Leitnere7487c82016-07-13 15:08:58 -0300113 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116/* RFC 2960 3.3.2 Initiation (INIT) (1)
117 *
118 * Note 2: The ECN capable field is reserved for future use of
119 * Explicit Congestion Notification.
120 */
121static const struct sctp_paramhdr ecap_param = {
122 SCTP_PARAM_ECN_CAPABLE,
Harvey Harrison09640e62009-02-01 00:45:17 -0800123 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124};
125static const struct sctp_paramhdr prsctp_param = {
126 SCTP_PARAM_FWD_TSN_SUPPORT,
Harvey Harrison09640e62009-02-01 00:45:17 -0800127 cpu_to_be16(sizeof(struct sctp_paramhdr)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128};
129
Neil Horman5fa782c2010-04-28 10:30:59 +0000130/* A helper to initialize an op error inside a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * provided chunk, as most cause codes will be embedded inside an
132 * abort chunk.
133 */
Al Viro5bf2db02006-11-20 16:59:45 -0800134void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +0800135 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
137 sctp_errhdr_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 __u16 len;
139
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900140 /* Cause code constants are now defined in network order. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 err.cause = cause_code;
142 len = sizeof(sctp_errhdr_t) + paylen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 err.length = htons(len);
Vlad Yasevich4a1c0102007-01-09 14:35:51 -0800144 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
Neil Horman5fa782c2010-04-28 10:30:59 +0000147/* A helper to initialize an op error inside a
148 * provided chunk, as most cause codes will be embedded inside an
149 * abort chunk. Differs from sctp_init_cause in that it won't oops
150 * if there isn't enough space in the op error chunk
151 */
Ioan Orghicidb28aaf2012-07-13 07:16:37 +0000152static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
Neil Horman5fa782c2010-04-28 10:30:59 +0000153 size_t paylen)
154{
155 sctp_errhdr_t err;
156 __u16 len;
157
158 /* Cause code constants are now defined in network order. */
159 err.cause = cause_code;
160 len = sizeof(sctp_errhdr_t) + paylen;
161 err.length = htons(len);
162
Wei Yongjun2e3219b2010-05-17 22:51:58 -0700163 if (skb_tailroom(chunk->skb) < len)
Neil Horman5fa782c2010-04-28 10:30:59 +0000164 return -ENOSPC;
165 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
166 sizeof(sctp_errhdr_t),
167 &err);
168 return 0;
169}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/* 3.3.2 Initiation (INIT) (1)
171 *
172 * This chunk is used to initiate a SCTP association between two
173 * endpoints. The format of the INIT chunk is shown below:
174 *
175 * 0 1 2 3
176 * 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
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
178 * | Type = 1 | Chunk Flags | Chunk Length |
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
180 * | Initiate Tag |
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * | Advertised Receiver Window Credit (a_rwnd) |
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 * | Number of Outbound Streams | Number of Inbound Streams |
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * | Initial TSN |
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * \ \
189 * / Optional/Variable-Length Parameters /
190 * \ \
191 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
192 *
193 *
194 * The INIT chunk contains the following parameters. Unless otherwise
195 * noted, each parameter MUST only be included once in the INIT chunk.
196 *
197 * Fixed Parameters Status
198 * ----------------------------------------------
199 * Initiate Tag Mandatory
200 * Advertised Receiver Window Credit Mandatory
201 * Number of Outbound Streams Mandatory
202 * Number of Inbound Streams Mandatory
203 * Initial TSN Mandatory
204 *
205 * Variable Parameters Status Type Value
206 * -------------------------------------------------------------
207 * IPv4 Address (Note 1) Optional 5
208 * IPv6 Address (Note 1) Optional 6
209 * Cookie Preservative Optional 9
210 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
211 * Host Name Address (Note 3) Optional 11
212 * Supported Address Types (Note 4) Optional 12
213 */
214struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
215 const struct sctp_bind_addr *bp,
Al Virodd0fc662005-10-07 07:46:04 +0100216 gfp_t gfp, int vparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000218 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200219 struct sctp_endpoint *ep = asoc->ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 sctp_inithdr_t init;
221 union sctp_params addrs;
222 size_t chunksize;
223 struct sctp_chunk *retval = NULL;
224 int num_types, addrs_len = 0;
225 struct sctp_sock *sp;
226 sctp_supported_addrs_param_t sat;
Al Viro3dbe8652006-11-20 17:25:49 -0800227 __be16 types[2];
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800228 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700229 sctp_supported_ext_param_t ext_param;
230 int num_ext = 0;
231 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700232 sctp_paramhdr_t *auth_chunks = NULL,
233 *auth_hmacs = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 /* RFC 2960 3.3.2 Initiation (INIT) (1)
236 *
237 * Note 1: The INIT chunks can contain multiple addresses that
238 * can be IPv4 and/or IPv6 in any combination.
239 */
240 retval = NULL;
241
242 /* Convert the provided bind address list to raw format. */
243 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
244
245 init.init_tag = htonl(asoc->c.my_vtag);
246 init.a_rwnd = htonl(asoc->rwnd);
247 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
248 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
249 init.initial_tsn = htonl(asoc->c.initial_tsn);
250
251 /* How many address types are needed? */
252 sp = sctp_sk(asoc->base.sk);
253 num_types = sp->pf->supported_addrs(sp, types);
254
Wei Yongjuna8170c32010-04-28 08:47:21 +0000255 chunksize = sizeof(init) + addrs_len;
256 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 chunksize += sizeof(ecap_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500258
Xin Long28aa4c22016-07-09 19:47:40 +0800259 if (asoc->prsctp_enable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800260 chunksize += sizeof(prsctp_param);
261
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700266 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000267 if (net->sctp.addip_enable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700268 extensions[num_ext] = SCTP_CID_ASCONF;
269 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
270 num_ext += 2;
271 }
272
malc6fc791e2009-03-12 09:49:20 +0000273 if (sp->adaptation_ind)
274 chunksize += sizeof(aiparam);
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 chunksize += vparam_len;
277
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700278 /* Account for AUTH related parameters */
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200279 if (ep->auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700280 /* Add random parameter length*/
281 chunksize += sizeof(asoc->c.auth_random);
282
283 /* Add HMACS parameter length if any were defined */
284 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
285 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000286 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700287 else
288 auth_hmacs = NULL;
289
290 /* Add CHUNKS parameter length */
291 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
292 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000293 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700294 else
Vlad Yasevich9baffaa2007-11-29 08:44:34 -0500295 auth_chunks = NULL;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700296
297 extensions[num_ext] = SCTP_CID_AUTH;
298 num_ext += 1;
299 }
300
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700301 /* If we have any extensions to report, account for that */
302 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000303 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
304 num_ext);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 /* RFC 2960 3.3.2 Initiation (INIT) (1)
307 *
308 * Note 3: An INIT chunk MUST NOT contain more than one Host
309 * Name address parameter. Moreover, the sender of the INIT
310 * MUST NOT combine any other address types with the Host Name
311 * address in the INIT. The receiver of INIT MUST ignore any
312 * other address types if the Host Name address parameter is
313 * present in the received INIT chunk.
314 *
315 * PLEASE DO NOT FIXME [This version does not support Host Name.]
316 */
317
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300318 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (!retval)
320 goto nodata;
321
322 retval->subh.init_hdr =
323 sctp_addto_chunk(retval, sizeof(init), &init);
324 retval->param_hdr.v =
325 sctp_addto_chunk(retval, addrs_len, addrs.v);
326
327 /* RFC 2960 3.3.2 Initiation (INIT) (1)
328 *
329 * Note 4: This parameter, when present, specifies all the
330 * address types the sending endpoint can support. The absence
331 * of this parameter indicates that the sending endpoint can
332 * support any address type.
333 */
334 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
335 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
336 sctp_addto_chunk(retval, sizeof(sat), &sat);
337 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
338
339 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700340
Joe Perches7aa1b542007-12-20 14:03:52 -0800341 /* Add the supported extensions parameter. Be nice and add this
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700342 * fist before addiding the parameters for the extensions themselves
343 */
344 if (num_ext) {
345 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
346 ext_param.param_hdr.length =
347 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
348 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
349 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500350 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700351 }
352
Xin Long28aa4c22016-07-09 19:47:40 +0800353 if (asoc->prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700355
malc6fc791e2009-03-12 09:49:20 +0000356 if (sp->adaptation_ind) {
357 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
358 aiparam.param_hdr.length = htons(sizeof(aiparam));
359 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
360 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
361 }
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700362
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700363 /* Add SCTP-AUTH chunks to the parameter list */
Vlad Yasevichb14878c2014-04-17 17:26:50 +0200364 if (ep->auth_enable) {
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700365 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
366 asoc->c.auth_random);
367 if (auth_hmacs)
368 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
369 auth_hmacs);
370 if (auth_chunks)
371 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
372 auth_chunks);
373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374nodata:
Jesper Juhla51482b2005-11-08 09:41:34 -0800375 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return retval;
377}
378
379struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
380 const struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100381 gfp_t gfp, int unkparam_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
383 sctp_inithdr_t initack;
384 struct sctp_chunk *retval;
385 union sctp_params addrs;
malc6fc791e2009-03-12 09:49:20 +0000386 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 int addrs_len;
388 sctp_cookie_param_t *cookie;
389 int cookie_len;
390 size_t chunksize;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800391 sctp_adaptation_ind_param_t aiparam;
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700392 sctp_supported_ext_param_t ext_param;
393 int num_ext = 0;
394 __u8 extensions[3];
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700395 sctp_paramhdr_t *auth_chunks = NULL,
396 *auth_hmacs = NULL,
397 *auth_random = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 retval = NULL;
400
401 /* Note: there may be no addresses to embed. */
402 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
403
404 initack.init_tag = htonl(asoc->c.my_vtag);
405 initack.a_rwnd = htonl(asoc->rwnd);
406 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
407 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
408 initack.initial_tsn = htonl(asoc->c.initial_tsn);
409
410 /* FIXME: We really ought to build the cookie right
411 * into the packet instead of allocating more fresh memory.
412 */
413 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
414 addrs.v, addrs_len);
415 if (!cookie)
416 goto nomem_cookie;
417
418 /* Calculate the total size of allocation, include the reserved
419 * space for reporting unknown parameters if it is specified.
420 */
malc6fc791e2009-03-12 09:49:20 +0000421 sp = sctp_sk(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
423
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900424 /* Tell peer that we'll do ECN only if peer advertised such cap. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 if (asoc->peer.ecn_capable)
426 chunksize += sizeof(ecap_param);
427
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000428 if (asoc->peer.prsctp_capable)
Vlad Yasevich036b5792008-01-07 00:28:16 -0800429 chunksize += sizeof(prsctp_param);
430
Wei Yongjun5ffad5a2009-03-12 09:49:18 +0000431 if (asoc->peer.asconf_capable) {
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700432 extensions[num_ext] = SCTP_CID_ASCONF;
433 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
434 num_ext += 2;
435 }
436
malc6fc791e2009-03-12 09:49:20 +0000437 if (sp->adaptation_ind)
438 chunksize += sizeof(aiparam);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700440 if (asoc->peer.auth_capable) {
441 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
442 chunksize += ntohs(auth_random->length);
443
444 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
445 if (auth_hmacs->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000446 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700447 else
448 auth_hmacs = NULL;
449
450 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
451 if (auth_chunks->length)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000452 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700453 else
454 auth_chunks = NULL;
455
456 extensions[num_ext] = SCTP_CID_AUTH;
457 num_ext += 1;
458 }
459
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500460 if (num_ext)
Wei Yongjuna8170c32010-04-28 08:47:21 +0000461 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
462 num_ext);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 /* Now allocate and fill out the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300465 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (!retval)
467 goto nomem_chunk;
468
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400469 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
470 *
471 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
472 * HEARTBEAT ACK, * etc.) to the same destination transport
473 * address from which it received the DATA or control chunk
474 * to which it is replying.
475 *
476 * [INIT ACK back to where the INIT came from.]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 */
478 retval->transport = chunk->transport;
Dan Carpenterb99a4d52010-04-30 22:41:09 -0400479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 retval->subh.init_hdr =
481 sctp_addto_chunk(retval, sizeof(initack), &initack);
482 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
483 sctp_addto_chunk(retval, cookie_len, cookie);
484 if (asoc->peer.ecn_capable)
485 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700486 if (num_ext) {
487 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
488 ext_param.param_hdr.length =
489 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
490 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
491 &ext_param);
Vlad Yasevich8ee4be32007-11-29 08:50:35 -0500492 sctp_addto_param(retval, num_ext, extensions);
Vlad Yasevich131a47e2007-09-16 15:53:56 -0700493 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 if (asoc->peer.prsctp_capable)
495 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
496
malc6fc791e2009-03-12 09:49:20 +0000497 if (sp->adaptation_ind) {
498 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
499 aiparam.param_hdr.length = htons(sizeof(aiparam));
500 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
501 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
502 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Vlad Yasevich730fc3d2007-09-16 19:32:11 -0700504 if (asoc->peer.auth_capable) {
505 sctp_addto_chunk(retval, ntohs(auth_random->length),
506 auth_random);
507 if (auth_hmacs)
508 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
509 auth_hmacs);
510 if (auth_chunks)
511 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
512 auth_chunks);
513 }
514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 /* We need to remove the const qualifier at this point. */
516 retval->asoc = (struct sctp_association *) asoc;
517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518nomem_chunk:
519 kfree(cookie);
520nomem_cookie:
Jesper Juhla51482b2005-11-08 09:41:34 -0800521 kfree(addrs.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return retval;
523}
524
525/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
526 *
527 * This chunk is used only during the initialization of an association.
528 * It is sent by the initiator of an association to its peer to complete
529 * the initialization process. This chunk MUST precede any DATA chunk
530 * sent within the association, but MAY be bundled with one or more DATA
531 * chunks in the same packet.
532 *
533 * 0 1 2 3
534 * 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
535 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
536 * | Type = 10 |Chunk Flags | Length |
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * / Cookie /
539 * \ \
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 *
542 * Chunk Flags: 8 bit
543 *
544 * Set to zero on transmit and ignored on receipt.
545 *
546 * Length: 16 bits (unsigned integer)
547 *
548 * Set to the size of the chunk in bytes, including the 4 bytes of
549 * the chunk header and the size of the Cookie.
550 *
551 * Cookie: variable size
552 *
553 * This field must contain the exact cookie received in the
554 * State Cookie parameter from the previous INIT ACK.
555 *
556 * An implementation SHOULD make the cookie as small as possible
557 * to insure interoperability.
558 */
559struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
560 const struct sctp_chunk *chunk)
561{
562 struct sctp_chunk *retval;
563 void *cookie;
564 int cookie_len;
565
566 cookie = asoc->peer.cookie;
567 cookie_len = asoc->peer.cookie_len;
568
569 /* Build a cookie echo chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300570 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
571 cookie_len, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (!retval)
573 goto nodata;
574 retval->subh.cookie_hdr =
575 sctp_addto_chunk(retval, cookie_len, cookie);
576
577 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
578 *
579 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
580 * HEARTBEAT ACK, * etc.) to the same destination transport
581 * address from which it * received the DATA or control chunk
582 * to which it is replying.
583 *
584 * [COOKIE ECHO back to where the INIT ACK came from.]
585 */
586 if (chunk)
587 retval->transport = chunk->transport;
588
589nodata:
590 return retval;
591}
592
593/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
594 *
595 * This chunk is used only during the initialization of an
596 * association. It is used to acknowledge the receipt of a COOKIE
597 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
598 * within the association, but MAY be bundled with one or more DATA
599 * chunks or SACK chunk in the same SCTP packet.
600 *
601 * 0 1 2 3
602 * 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
603 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
604 * | Type = 11 |Chunk Flags | Length = 4 |
605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
606 *
607 * Chunk Flags: 8 bits
608 *
609 * Set to zero on transmit and ignored on receipt.
610 */
611struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
612 const struct sctp_chunk *chunk)
613{
614 struct sctp_chunk *retval;
615
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300616 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
619 *
620 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
621 * HEARTBEAT ACK, * etc.) to the same destination transport
622 * address from which it * received the DATA or control chunk
623 * to which it is replying.
624 *
625 * [COOKIE ACK back to where the COOKIE ECHO came from.]
626 */
627 if (retval && chunk)
628 retval->transport = chunk->transport;
629
630 return retval;
631}
632
633/*
634 * Appendix A: Explicit Congestion Notification:
635 * CWR:
636 *
637 * RFC 2481 details a specific bit for a sender to send in the header of
638 * its next outbound TCP segment to indicate to its peer that it has
639 * reduced its congestion window. This is termed the CWR bit. For
640 * SCTP the same indication is made by including the CWR chunk.
641 * This chunk contains one data element, i.e. the TSN number that
642 * was sent in the ECNE chunk. This element represents the lowest
643 * TSN number in the datagram that was originally marked with the
644 * CE bit.
645 *
646 * 0 1 2 3
647 * 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
648 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
649 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651 * | Lowest TSN Number |
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653 *
654 * Note: The CWR is considered a Control chunk.
655 */
656struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
657 const __u32 lowest_tsn,
658 const struct sctp_chunk *chunk)
659{
660 struct sctp_chunk *retval;
661 sctp_cwrhdr_t cwr;
662
663 cwr.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400664 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300665 sizeof(sctp_cwrhdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
667 if (!retval)
668 goto nodata;
669
670 retval->subh.ecn_cwr_hdr =
671 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
672
673 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
674 *
675 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
676 * HEARTBEAT ACK, * etc.) to the same destination transport
677 * address from which it * received the DATA or control chunk
678 * to which it is replying.
679 *
680 * [Report a reduced congestion window back to where the ECNE
681 * came from.]
682 */
683 if (chunk)
684 retval->transport = chunk->transport;
685
686nodata:
687 return retval;
688}
689
690/* Make an ECNE chunk. This is a congestion experienced report. */
691struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
692 const __u32 lowest_tsn)
693{
694 struct sctp_chunk *retval;
695 sctp_ecnehdr_t ecne;
696
697 ecne.lowest_tsn = htonl(lowest_tsn);
Vlad Yasevich072017b2013-08-09 22:05:36 -0400698 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300699 sizeof(sctp_ecnehdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (!retval)
701 goto nodata;
702 retval->subh.ecne_hdr =
703 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
704
705nodata:
706 return retval;
707}
708
Xin Longa6c2f792016-07-09 19:47:43 +0800709static void sctp_set_prsctp_policy(struct sctp_chunk *chunk,
710 const struct sctp_sndrcvinfo *sinfo)
711{
712 if (!chunk->asoc->prsctp_enable)
713 return;
714
715 if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags))
716 chunk->prsctp_param =
717 jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive);
Xin Long8dbdf1f2016-07-09 19:47:45 +0800718 else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags) ||
719 SCTP_PR_PRIO_ENABLED(sinfo->sinfo_flags))
Xin Long01aadb32016-07-09 19:47:44 +0800720 chunk->prsctp_param = sinfo->sinfo_timetolive;
Xin Longa6c2f792016-07-09 19:47:43 +0800721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723/* Make a DATA chunk for the given association from the provided
724 * parameters. However, do not populate the data payload.
725 */
726struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
727 const struct sctp_sndrcvinfo *sinfo,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300728 int data_len, __u8 flags, __u16 ssn,
729 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
731 struct sctp_chunk *retval;
732 struct sctp_datahdr dp;
733 int chunk_len;
734
735 /* We assign the TSN as LATE as possible, not here when
736 * creating the chunk.
737 */
738 dp.tsn = 0;
739 dp.stream = htons(sinfo->sinfo_stream);
740 dp.ppid = sinfo->sinfo_ppid;
741
742 /* Set the flags for an unordered send. */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700743 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 flags |= SCTP_DATA_UNORDERED;
745 dp.ssn = 0;
746 } else
747 dp.ssn = htons(ssn);
748
749 chunk_len = sizeof(dp) + data_len;
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300750 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 if (!retval)
752 goto nodata;
753
754 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
755 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
Xin Longa6c2f792016-07-09 19:47:43 +0800756 sctp_set_prsctp_policy(retval, sinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758nodata:
759 return retval;
760}
761
762/* Create a selective ackowledgement (SACK) for the given
763 * association. This reports on which TSN's we've seen to date,
764 * including duplicates and gaps.
765 */
766struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
767{
768 struct sctp_chunk *retval;
769 struct sctp_sackhdr sack;
770 int len;
771 __u32 ctsn;
772 __u16 num_gabs, num_dup_tsns;
Neil Horman42448542012-06-30 03:04:26 +0000773 struct sctp_association *aptr = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
Vlad Yasevich02015182008-10-08 14:19:01 -0700775 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
Neil Horman42448542012-06-30 03:04:26 +0000776 struct sctp_transport *trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Vlad Yasevich02015182008-10-08 14:19:01 -0700778 memset(gabs, 0, sizeof(gabs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 ctsn = sctp_tsnmap_get_ctsn(map);
Daniel Borkmannbb333812013-06-28 19:49:40 +0200780
781 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 /* How much room is needed in the chunk? */
Vlad Yasevich02015182008-10-08 14:19:01 -0700784 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 num_dup_tsns = sctp_tsnmap_num_dups(map);
786
787 /* Initialize the SACK header. */
788 sack.cum_tsn_ack = htonl(ctsn);
789 sack.a_rwnd = htonl(asoc->a_rwnd);
790 sack.num_gap_ack_blocks = htons(num_gabs);
791 sack.num_dup_tsns = htons(num_dup_tsns);
792
793 len = sizeof(sack)
794 + sizeof(struct sctp_gap_ack_block) * num_gabs
795 + sizeof(__u32) * num_dup_tsns;
796
797 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300798 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 if (!retval)
800 goto nodata;
801
802 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
803 *
804 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
805 * HEARTBEAT ACK, etc.) to the same destination transport
806 * address from which it received the DATA or control chunk to
807 * which it is replying. This rule should also be followed if
808 * the endpoint is bundling DATA chunks together with the
809 * reply chunk.
810 *
811 * However, when acknowledging multiple DATA chunks received
812 * in packets from different source addresses in a single
813 * SACK, the SACK chunk may be transmitted to one of the
814 * destination transport addresses from which the DATA or
815 * control chunks being acknowledged were received.
816 *
817 * [BUG: We do not implement the following paragraph.
818 * Perhaps we should remember the last transport we used for a
819 * SACK and avoid that (if possible) if we have seen any
820 * duplicates. --piggy]
821 *
822 * When a receiver of a duplicate DATA chunk sends a SACK to a
823 * multi- homed endpoint it MAY be beneficial to vary the
824 * destination address and not use the source address of the
825 * DATA chunk. The reason being that receiving a duplicate
826 * from a multi-homed endpoint might indicate that the return
827 * path (as specified in the source address of the DATA chunk)
828 * for the SACK is broken.
829 *
830 * [Send to the address from which we last received a DATA chunk.]
831 */
832 retval->transport = asoc->peer.last_data_from;
833
834 retval->subh.sack_hdr =
835 sctp_addto_chunk(retval, sizeof(sack), &sack);
836
837 /* Add the gap ack block information. */
838 if (num_gabs)
839 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
Vlad Yasevich02015182008-10-08 14:19:01 -0700840 gabs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842 /* Add the duplicate TSN information. */
Michele Baldessari196d6752012-12-01 04:49:42 +0000843 if (num_dup_tsns) {
844 aptr->stats.idupchunks += num_dup_tsns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
846 sctp_tsnmap_get_dups(map));
Michele Baldessari196d6752012-12-01 04:49:42 +0000847 }
Neil Horman42448542012-06-30 03:04:26 +0000848 /* Once we have a sack generated, check to see what our sack
849 * generation is, if its 0, reset the transports to 0, and reset
850 * the association generation to 1
851 *
852 * The idea is that zero is never used as a valid generation for the
853 * association so no transport will match after a wrap event like this,
854 * Until the next sack
855 */
856 if (++aptr->peer.sack_generation == 0) {
857 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
858 transports)
859 trans->sack_generation = 0;
860 aptr->peer.sack_generation = 1;
861 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862nodata:
863 return retval;
864}
865
866/* Make a SHUTDOWN chunk. */
867struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
868 const struct sctp_chunk *chunk)
869{
870 struct sctp_chunk *retval;
871 sctp_shutdownhdr_t shut;
872 __u32 ctsn;
873
874 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
875 shut.cum_tsn_ack = htonl(ctsn);
876
Vlad Yasevich072017b2013-08-09 22:05:36 -0400877 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300878 sizeof(sctp_shutdownhdr_t), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 if (!retval)
880 goto nodata;
881
882 retval->subh.shutdown_hdr =
883 sctp_addto_chunk(retval, sizeof(shut), &shut);
884
885 if (chunk)
886 retval->transport = chunk->transport;
887nodata:
888 return retval;
889}
890
891struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
892 const struct sctp_chunk *chunk)
893{
894 struct sctp_chunk *retval;
895
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300896 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
897 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
900 *
901 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
902 * HEARTBEAT ACK, * etc.) to the same destination transport
903 * address from which it * received the DATA or control chunk
904 * to which it is replying.
905 *
906 * [ACK back to where the SHUTDOWN came from.]
907 */
908 if (retval && chunk)
909 retval->transport = chunk->transport;
910
911 return retval;
912}
913
914struct sctp_chunk *sctp_make_shutdown_complete(
915 const struct sctp_association *asoc,
916 const struct sctp_chunk *chunk)
917{
918 struct sctp_chunk *retval;
919 __u8 flags = 0;
920
Jerome Forissier047a2422005-04-28 11:58:43 -0700921 /* Set the T-bit if we have no association (vtag will be
922 * reflected)
923 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
925
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300926 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
927 0, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
930 *
931 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
932 * HEARTBEAT ACK, * etc.) to the same destination transport
933 * address from which it * received the DATA or control chunk
934 * to which it is replying.
935 *
936 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
937 * came from.]
938 */
939 if (retval && chunk)
940 retval->transport = chunk->transport;
941
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900942 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943}
944
945/* Create an ABORT. Note that we set the T bit if we have no
Jerome Forissier047a2422005-04-28 11:58:43 -0700946 * association, except when responding to an INIT (sctpimpguide 2.41).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 */
948struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
949 const struct sctp_chunk *chunk,
950 const size_t hint)
951{
952 struct sctp_chunk *retval;
953 __u8 flags = 0;
954
Jerome Forissier047a2422005-04-28 11:58:43 -0700955 /* Set the T-bit if we have no association and 'chunk' is not
956 * an INIT (vtag will be reflected).
957 */
958 if (!asoc) {
959 if (chunk && chunk->chunk_hdr &&
960 chunk->chunk_hdr->type == SCTP_CID_INIT)
961 flags = 0;
962 else
963 flags = SCTP_CHUNK_FLAG_T;
964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -0300966 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
967 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
969 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
970 *
971 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
972 * HEARTBEAT ACK, * etc.) to the same destination transport
973 * address from which it * received the DATA or control chunk
974 * to which it is replying.
975 *
976 * [ABORT back to where the offender came from.]
977 */
978 if (retval && chunk)
979 retval->transport = chunk->transport;
980
981 return retval;
982}
983
984/* Helper to create ABORT with a NO_USER_DATA error. */
985struct sctp_chunk *sctp_make_abort_no_data(
986 const struct sctp_association *asoc,
987 const struct sctp_chunk *chunk, __u32 tsn)
988{
989 struct sctp_chunk *retval;
Al Viro9f81bcd2006-11-20 17:26:34 -0800990 __be32 payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
993 + sizeof(tsn));
994
995 if (!retval)
996 goto no_mem;
997
998 /* Put the tsn back into network byte order. */
999 payload = htonl(tsn);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001000 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
1001 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
1003 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1004 *
1005 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1006 * HEARTBEAT ACK, * etc.) to the same destination transport
1007 * address from which it * received the DATA or control chunk
1008 * to which it is replying.
1009 *
1010 * [ABORT back to where the offender came from.]
1011 */
1012 if (chunk)
1013 retval->transport = chunk->transport;
1014
1015no_mem:
1016 return retval;
1017}
1018
1019/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1020struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
Al Viro6ce8e9c2014-04-06 21:25:44 -04001021 struct msghdr *msg,
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001022 size_t paylen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
1024 struct sctp_chunk *retval;
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001025 void *payload = NULL;
1026 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001028 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 if (!retval)
1030 goto err_chunk;
1031
1032 if (paylen) {
1033 /* Put the msg_iov together into payload. */
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001034 payload = kmalloc(paylen, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 if (!payload)
1036 goto err_payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Al Viro6ce8e9c2014-04-06 21:25:44 -04001038 err = memcpy_from_msg(payload, msg, paylen);
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001039 if (err < 0)
1040 goto err_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 }
1042
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001043 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1044 sctp_addto_chunk(retval, paylen, payload);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046 if (paylen)
1047 kfree(payload);
1048
1049 return retval;
1050
1051err_copy:
1052 kfree(payload);
1053err_payload:
1054 sctp_chunk_free(retval);
1055 retval = NULL;
1056err_chunk:
1057 return retval;
1058}
1059
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001060/* Append bytes to the end of a parameter. Will panic if chunk is not big
1061 * enough.
1062 */
1063static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1064 const void *data)
1065{
1066 void *target;
1067 int chunklen = ntohs(chunk->chunk_hdr->length);
1068
1069 target = skb_put(chunk->skb, len);
1070
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001071 if (data)
1072 memcpy(target, data, len);
1073 else
1074 memset(target, 0, len);
Adrian Bunk5c94bf82007-09-12 15:16:21 +02001075
1076 /* Adjust the chunk length field. */
1077 chunk->chunk_hdr->length = htons(chunklen + len);
1078 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1079
1080 return target;
1081}
1082
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001083/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084struct sctp_chunk *sctp_make_abort_violation(
1085 const struct sctp_association *asoc,
1086 const struct sctp_chunk *chunk,
1087 const __u8 *payload,
1088 const size_t paylen)
1089{
1090 struct sctp_chunk *retval;
1091 struct sctp_paramhdr phdr;
1092
1093 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001094 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (!retval)
1096 goto end;
1097
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001098 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1099 + sizeof(sctp_paramhdr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101 phdr.type = htons(chunk->chunk_hdr->type);
1102 phdr.length = chunk->chunk_hdr->length;
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001103 sctp_addto_chunk(retval, paylen, payload);
1104 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
1106end:
1107 return retval;
1108}
1109
Wei Yongjunba016672008-09-30 05:32:24 -07001110struct sctp_chunk *sctp_make_violation_paramlen(
1111 const struct sctp_association *asoc,
1112 const struct sctp_chunk *chunk,
1113 struct sctp_paramhdr *param)
1114{
1115 struct sctp_chunk *retval;
1116 static const char error[] = "The following parameter had invalid length:";
1117 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1118 sizeof(sctp_paramhdr_t);
1119
1120 retval = sctp_make_abort(asoc, chunk, payload_len);
1121 if (!retval)
1122 goto nodata;
1123
1124 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1125 sizeof(error) + sizeof(sctp_paramhdr_t));
1126 sctp_addto_chunk(retval, sizeof(error), error);
1127 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1128
1129nodata:
1130 return retval;
1131}
1132
Neil Hormande4594a2012-11-20 10:14:30 +00001133struct sctp_chunk *sctp_make_violation_max_retrans(
1134 const struct sctp_association *asoc,
1135 const struct sctp_chunk *chunk)
1136{
1137 struct sctp_chunk *retval;
1138 static const char error[] = "Association exceeded its max_retans count";
1139 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1140
1141 retval = sctp_make_abort(asoc, chunk, payload_len);
1142 if (!retval)
1143 goto nodata;
1144
1145 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1146 sctp_addto_chunk(retval, sizeof(error), error);
1147
1148nodata:
1149 return retval;
1150}
1151
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152/* Make a HEARTBEAT chunk. */
1153struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
Wei Yongjun92c73af2011-04-19 21:31:47 +00001154 const struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155{
Wei Yongjun92c73af2011-04-19 21:31:47 +00001156 struct sctp_chunk *retval;
1157 sctp_sender_hb_info_t hbinfo;
1158
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001159 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1160 sizeof(hbinfo), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
1162 if (!retval)
1163 goto nodata;
1164
Wei Yongjun92c73af2011-04-19 21:31:47 +00001165 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1166 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1167 hbinfo.daddr = transport->ipaddr;
1168 hbinfo.sent_at = jiffies;
1169 hbinfo.hb_nonce = transport->hb_nonce;
1170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 /* Cast away the 'const', as this is just telling the chunk
1172 * what transport it belongs to.
1173 */
1174 retval->transport = (struct sctp_transport *) transport;
Wei Yongjun92c73af2011-04-19 21:31:47 +00001175 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1176 &hbinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177
1178nodata:
1179 return retval;
1180}
1181
1182struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1183 const struct sctp_chunk *chunk,
1184 const void *payload, const size_t paylen)
1185{
1186 struct sctp_chunk *retval;
1187
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001188 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1189 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (!retval)
1191 goto nodata;
1192
1193 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1194
1195 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1196 *
1197 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1198 * HEARTBEAT ACK, * etc.) to the same destination transport
1199 * address from which it * received the DATA or control chunk
1200 * to which it is replying.
1201 *
1202 * [HBACK back to where the HEARTBEAT came from.]
1203 */
1204 if (chunk)
1205 retval->transport = chunk->transport;
1206
1207nodata:
1208 return retval;
1209}
1210
1211/* Create an Operation Error chunk with the specified space reserved.
1212 * This routine can be used for containing multiple causes in the chunk.
1213 */
1214static struct sctp_chunk *sctp_make_op_error_space(
1215 const struct sctp_association *asoc,
1216 const struct sctp_chunk *chunk,
1217 size_t size)
1218{
1219 struct sctp_chunk *retval;
1220
Vlad Yasevich072017b2013-08-09 22:05:36 -04001221 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001222 sizeof(sctp_errhdr_t) + size, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 if (!retval)
1224 goto nodata;
1225
1226 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1227 *
1228 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1229 * HEARTBEAT ACK, etc.) to the same destination transport
1230 * address from which it received the DATA or control chunk
1231 * to which it is replying.
1232 *
1233 */
1234 if (chunk)
1235 retval->transport = chunk->transport;
1236
1237nodata:
1238 return retval;
1239}
1240
Neil Horman5fa782c2010-04-28 10:30:59 +00001241/* Create an Operation Error chunk of a fixed size,
1242 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1243 * This is a helper function to allocate an error chunk for
1244 * for those invalid parameter codes in which we may not want
Jorrit Schippersd82603c2012-12-27 17:33:02 +01001245 * to report all the errors, if the incoming chunk is large
Neil Horman5fa782c2010-04-28 10:30:59 +00001246 */
1247static inline struct sctp_chunk *sctp_make_op_error_fixed(
1248 const struct sctp_association *asoc,
1249 const struct sctp_chunk *chunk)
1250{
1251 size_t size = asoc ? asoc->pathmtu : 0;
1252
1253 if (!size)
1254 size = SCTP_DEFAULT_MAXSEGMENT;
1255
1256 return sctp_make_op_error_space(asoc, chunk, size);
1257}
1258
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259/* Create an Operation Error chunk. */
1260struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1261 const struct sctp_chunk *chunk,
Al Viro63706c52006-11-20 17:00:05 -08001262 __be16 cause_code, const void *payload,
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001263 size_t paylen, size_t reserve_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264{
1265 struct sctp_chunk *retval;
1266
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001267 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 if (!retval)
1269 goto nodata;
1270
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001271 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001272 sctp_addto_chunk(retval, paylen, payload);
Vlad Yasevich6383cfb2009-11-23 15:53:56 -05001273 if (reserve_tail)
1274 sctp_addto_param(retval, reserve_tail, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
1276nodata:
1277 return retval;
1278}
1279
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001280struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1281{
1282 struct sctp_chunk *retval;
1283 struct sctp_hmac *hmac_desc;
1284 struct sctp_authhdr auth_hdr;
1285 __u8 *hmac;
1286
1287 /* Get the first hmac that the peer told us to use */
1288 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1289 if (unlikely(!hmac_desc))
1290 return NULL;
1291
Vlad Yasevich072017b2013-08-09 22:05:36 -04001292 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001293 hmac_desc->hmac_len + sizeof(sctp_authhdr_t),
1294 GFP_ATOMIC);
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001295 if (!retval)
1296 return NULL;
1297
1298 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1299 auth_hdr.shkey_id = htons(asoc->active_key_id);
1300
1301 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1302 &auth_hdr);
1303
1304 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1305 memset(hmac, 0, hmac_desc->hmac_len);
1306
1307 /* Adjust the chunk header to include the empty MAC */
1308 retval->chunk_hdr->length =
1309 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1310 retval->chunk_end = skb_tail_pointer(retval->skb);
1311
1312 return retval;
1313}
1314
1315
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316/********************************************************************
1317 * 2nd Level Abstractions
1318 ********************************************************************/
1319
1320/* Turn an skb into a chunk.
1321 * FIXME: Eventually move the structure directly inside the skb->cb[].
wangweidong3dc0a542013-10-26 16:06:31 +08001322 *
1323 * sctpimpguide-05.txt Section 2.8.2
1324 * M1) Each time a new DATA chunk is transmitted
1325 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1326 * 'TSN.Missing.Report' count will be used to determine missing chunks
1327 * and when to fast retransmit.
1328 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 */
1330struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1331 const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001332 struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333{
1334 struct sctp_chunk *retval;
1335
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001336 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
1338 if (!retval)
1339 goto nodata;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001340 if (!sk)
1341 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
David S. Miller79af02c2005-07-08 21:47:49 -07001343 INIT_LIST_HEAD(&retval->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 retval->skb = skb;
1345 retval->asoc = (struct sctp_association *)asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 retval->singleton = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
Neil Hormanc226ef92008-07-25 12:44:09 -04001348 retval->fast_retransmit = SCTP_CAN_FRTX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 /* Polish the bead hole. */
1351 INIT_LIST_HEAD(&retval->transmitted_list);
1352 INIT_LIST_HEAD(&retval->frag_list);
1353 SCTP_DBG_OBJCNT_INC(chunk);
1354 atomic_set(&retval->refcnt, 1);
1355
1356nodata:
1357 return retval;
1358}
1359
1360/* Set chunk->source and dest based on the IP header in chunk->skb. */
1361void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1362 union sctp_addr *dest)
1363{
Al Virof235fca2006-11-20 17:09:01 -08001364 memcpy(&chunk->source, src, sizeof(union sctp_addr));
Al Viro16b0a032006-11-20 17:13:38 -08001365 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366}
1367
1368/* Extract the source address from a chunk. */
1369const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1370{
1371 /* If we have a known transport, use that. */
1372 if (chunk->transport) {
Al Viro6a1e5f32006-11-20 17:12:25 -08001373 return &chunk->transport->ipaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 } else {
1375 /* Otherwise, extract it from the IP header. */
Al Viro6a1e5f32006-11-20 17:12:25 -08001376 return &chunk->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 }
1378}
1379
1380/* Create a new chunk, setting the type and flags headers from the
1381 * arguments, reserving enough space for a 'paylen' byte payload.
1382 */
Vlad Yasevich072017b2013-08-09 22:05:36 -04001383static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001384 __u8 type, __u8 flags, int paylen,
1385 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386{
1387 struct sctp_chunk *retval;
1388 sctp_chunkhdr_t *chunk_hdr;
1389 struct sk_buff *skb;
1390 struct sock *sk;
1391
1392 /* No need to allocate LL here, as this is only a chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001393 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 if (!skb)
1395 goto nodata;
1396
1397 /* Make room for the chunk header. */
1398 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1399 chunk_hdr->type = type;
1400 chunk_hdr->flags = flags;
1401 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1402
1403 sk = asoc ? asoc->base.sk : NULL;
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001404 retval = sctp_chunkify(skb, asoc, sk, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 if (!retval) {
1406 kfree_skb(skb);
1407 goto nodata;
1408 }
1409
1410 retval->chunk_hdr = chunk_hdr;
1411 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1412
Vlad Yasevich4cd57c82007-09-16 19:32:45 -07001413 /* Determine if the chunk needs to be authenticated */
1414 if (sctp_auth_send_cid(type, asoc))
1415 retval->auth = 1;
1416
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 return retval;
1418nodata:
1419 return NULL;
1420}
1421
Vlad Yasevich072017b2013-08-09 22:05:36 -04001422static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001423 __u8 flags, int paylen, gfp_t gfp)
Vlad Yasevich072017b2013-08-09 22:05:36 -04001424{
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001425 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -04001426}
1427
1428static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001429 __u8 type, __u8 flags, int paylen,
1430 gfp_t gfp)
Vlad Yasevich072017b2013-08-09 22:05:36 -04001431{
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001432 struct sctp_chunk *chunk;
Vlad Yasevich072017b2013-08-09 22:05:36 -04001433
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03001434 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
Vlad Yasevich072017b2013-08-09 22:05:36 -04001435 if (chunk)
1436 sctp_control_set_owner_w(chunk);
1437
1438 return chunk;
1439}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
1441/* Release the memory occupied by a chunk. */
1442static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1443{
Vlad Yasevicha08de642007-12-20 14:11:47 -08001444 BUG_ON(!list_empty(&chunk->list));
1445 list_del_init(&chunk->transmitted_list);
1446
Daniel Borkmannc4856582014-03-04 16:35:51 +01001447 consume_skb(chunk->skb);
1448 consume_skb(chunk->auth_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
1450 SCTP_DBG_OBJCNT_DEC(chunk);
1451 kmem_cache_free(sctp_chunk_cachep, chunk);
1452}
1453
1454/* Possibly, free the chunk. */
1455void sctp_chunk_free(struct sctp_chunk *chunk)
1456{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 /* Release our reference on the message tracker. */
1458 if (chunk->msg)
1459 sctp_datamsg_put(chunk->msg);
1460
1461 sctp_chunk_put(chunk);
1462}
1463
1464/* Grab a reference to the chunk. */
1465void sctp_chunk_hold(struct sctp_chunk *ch)
1466{
1467 atomic_inc(&ch->refcnt);
1468}
1469
1470/* Release a reference to the chunk. */
1471void sctp_chunk_put(struct sctp_chunk *ch)
1472{
1473 if (atomic_dec_and_test(&ch->refcnt))
1474 sctp_chunk_destroy(ch);
1475}
1476
1477/* Append bytes to the end of a chunk. Will panic if chunk is not big
1478 * enough.
1479 */
1480void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1481{
1482 void *target;
1483 void *padding;
1484 int chunklen = ntohs(chunk->chunk_hdr->length);
Wei Yongjun8d614ad2007-08-06 13:55:47 +08001485 int padlen = WORD_ROUND(chunklen) - chunklen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 padding = skb_put(chunk->skb, padlen);
1488 target = skb_put(chunk->skb, len);
1489
1490 memset(padding, 0, padlen);
1491 memcpy(target, data, len);
1492
1493 /* Adjust the chunk length field. */
1494 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001495 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
1497 return target;
1498}
1499
Neil Horman5fa782c2010-04-28 10:30:59 +00001500/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1501 * space in the chunk
1502 */
stephen hemminger6daaf0d2014-01-09 22:31:11 -08001503static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1504 int len, const void *data)
Neil Horman5fa782c2010-04-28 10:30:59 +00001505{
Wei Yongjun2e3219b2010-05-17 22:51:58 -07001506 if (skb_tailroom(chunk->skb) >= len)
Neil Horman5fa782c2010-04-28 10:30:59 +00001507 return sctp_addto_chunk(chunk, len, data);
1508 else
1509 return NULL;
1510}
1511
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512/* Append bytes from user space to the end of a chunk. Will panic if
1513 * chunk is not big enough.
1514 * Returns a kernel err value.
1515 */
Al Viroe0eb0932014-11-15 01:11:23 -05001516int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1517 struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518{
Al Viroe0eb0932014-11-15 01:11:23 -05001519 void *target;
1520 ssize_t copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522 /* Make room in chunk for data. */
1523 target = skb_put(chunk->skb, len);
1524
1525 /* Copy data (whole iovec) into chunk */
Al Viroe0eb0932014-11-15 01:11:23 -05001526 copied = copy_from_iter(target, len, from);
1527 if (copied != len)
1528 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
1530 /* Adjust the chunk length field. */
1531 chunk->chunk_hdr->length =
1532 htons(ntohs(chunk->chunk_hdr->length) + len);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001533 chunk->chunk_end = skb_tail_pointer(chunk->skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Al Viroe0eb0932014-11-15 01:11:23 -05001535 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
1537
1538/* Helper function to assign a TSN if needed. This assumes that both
1539 * the data_hdr and association have already been assigned.
1540 */
1541void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1542{
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001543 struct sctp_datamsg *msg;
1544 struct sctp_chunk *lchunk;
1545 struct sctp_stream *stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 __u16 ssn;
1547 __u16 sid;
1548
1549 if (chunk->has_ssn)
1550 return;
1551
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001552 /* All fragments will be on the same stream */
1553 sid = ntohs(chunk->subh.data_hdr->stream);
1554 stream = &chunk->asoc->ssnmap->out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Vlad Yasevichab3e5e72007-08-02 16:51:42 -04001556 /* Now assign the sequence number to the entire message.
1557 * All fragments must have the same stream sequence number.
1558 */
1559 msg = chunk->msg;
1560 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1561 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1562 ssn = 0;
1563 } else {
1564 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1565 ssn = sctp_ssn_next(stream, sid);
1566 else
1567 ssn = sctp_ssn_peek(stream, sid);
1568 }
1569
1570 lchunk->subh.data_hdr->ssn = htons(ssn);
1571 lchunk->has_ssn = 1;
1572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573}
1574
1575/* Helper function to assign a TSN if needed. This assumes that both
1576 * the data_hdr and association have already been assigned.
1577 */
1578void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1579{
1580 if (!chunk->has_tsn) {
1581 /* This is the last possible instant to
1582 * assign a TSN.
1583 */
1584 chunk->subh.data_hdr->tsn =
1585 htonl(sctp_association_get_next_tsn(chunk->asoc));
1586 chunk->has_tsn = 1;
1587 }
1588}
1589
1590/* Create a CLOSED association to use with an incoming packet. */
1591struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -07001592 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +01001593 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594{
1595 struct sctp_association *asoc;
1596 struct sk_buff *skb;
1597 sctp_scope_t scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
1599 /* Create the bare association. */
1600 scope = sctp_scope(sctp_source(chunk));
1601 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1602 if (!asoc)
1603 goto nodata;
1604 asoc->temp = 1;
1605 skb = chunk->skb;
1606 /* Create an entry for the source address of the packet. */
Marcelo Ricardo Leitnere7487c82016-07-13 15:08:58 -03001607 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1608
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609nodata:
1610 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611}
1612
1613/* Build a cookie representing asoc.
1614 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1615 */
1616static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1617 const struct sctp_association *asoc,
1618 const struct sctp_chunk *init_chunk,
1619 int *cookie_len,
1620 const __u8 *raw_addrs, int addrs_len)
1621{
1622 sctp_cookie_param_t *retval;
1623 struct sctp_signed_cookie *cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 int headersize, bodysize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001626 /* Header size is static data prior to the actual cookie, including
1627 * any padding.
1628 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001629 headersize = sizeof(sctp_paramhdr_t) +
1630 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001631 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 bodysize = sizeof(struct sctp_cookie)
1633 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1634
1635 /* Pad out the cookie to a multiple to make the signature
1636 * functions simpler to write.
1637 */
1638 if (bodysize % SCTP_COOKIE_MULTIPLE)
1639 bodysize += SCTP_COOKIE_MULTIPLE
1640 - (bodysize % SCTP_COOKIE_MULTIPLE);
1641 *cookie_len = headersize + bodysize;
1642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 /* Clear this memory since we are sending this data structure
1644 * out on the network.
1645 */
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02001646 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1647 if (!retval)
1648 goto nodata;
1649
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 cookie = (struct sctp_signed_cookie *) retval->body;
1651
1652 /* Set up the parameter header. */
1653 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1654 retval->p.length = htons(*cookie_len);
1655
1656 /* Copy the cookie part of the association itself. */
1657 cookie->c = asoc->c;
1658 /* Save the raw address list length in the cookie. */
1659 cookie->c.raw_addr_list_len = addrs_len;
1660
1661 /* Remember PR-SCTP capability. */
1662 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1663
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001664 /* Save adaptation indication in the cookie. */
1665 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
1667 /* Set an expiration time for the cookie. */
Daniel Borkmann52db8822013-06-25 18:17:27 +02001668 cookie->c.expiration = ktime_add(asoc->cookie_life,
Marcelo Ricardo Leitnercb5e1732015-12-04 15:14:03 -02001669 ktime_get_real());
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
1671 /* Copy the peer's init packet. */
1672 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1673 ntohs(init_chunk->chunk_hdr->length));
1674
1675 /* Copy the raw local address list of the association. */
1676 memcpy((__u8 *)&cookie->c.peer_init[0] +
1677 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1678
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001679 if (sctp_sk(ep->base.sk)->hmac) {
Herbert Xu5821c762016-01-24 21:20:12 +08001680 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1681 int err;
Herbert Xu1b489e12006-08-20 15:07:14 +10001682
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 /* Sign the message. */
Herbert Xu5821c762016-01-24 21:20:12 +08001684 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1685 desc->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686
Herbert Xu5821c762016-01-24 21:20:12 +08001687 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1688 sizeof(ep->secret_key)) ?:
1689 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1690 cookie->signature);
1691 shash_desc_zero(desc);
1692 if (err)
Herbert Xu1b489e12006-08-20 15:07:14 +10001693 goto free_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 }
1695
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 return retval;
Herbert Xu1b489e12006-08-20 15:07:14 +10001697
1698free_cookie:
1699 kfree(retval);
1700nodata:
1701 *cookie_len = 0;
1702 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703}
1704
1705/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1706struct sctp_association *sctp_unpack_cookie(
1707 const struct sctp_endpoint *ep,
1708 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +01001709 struct sctp_chunk *chunk, gfp_t gfp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 int *error, struct sctp_chunk **errp)
1711{
1712 struct sctp_association *retval = NULL;
1713 struct sctp_signed_cookie *cookie;
1714 struct sctp_cookie *bear_cookie;
1715 int headersize, bodysize, fixed_size;
Vlad Yasevich313e7b42006-01-17 11:55:57 -08001716 __u8 *digest = ep->digest;
Daniel Borkmann570617e2013-02-12 05:15:33 +00001717 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 sctp_scope_t scope;
1719 struct sk_buff *skb = chunk->skb;
Daniel Borkmann52db8822013-06-25 18:17:27 +02001720 ktime_t kt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001722 /* Header size is static data prior to the actual cookie, including
1723 * any padding.
1724 */
1725 headersize = sizeof(sctp_chunkhdr_t) +
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001726 (sizeof(struct sctp_signed_cookie) -
Vlad Yasevich9834a2b2006-01-17 11:52:12 -08001727 sizeof(struct sctp_cookie));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1729 fixed_size = headersize + sizeof(struct sctp_cookie);
1730
1731 /* Verify that the chunk looks like it even has a cookie.
1732 * There must be enough room for our cookie and our peer's
1733 * INIT chunk.
1734 */
1735 len = ntohs(chunk->chunk_hdr->length);
1736 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1737 goto malformed;
1738
1739 /* Verify that the cookie has been padded out. */
1740 if (bodysize % SCTP_COOKIE_MULTIPLE)
1741 goto malformed;
1742
1743 /* Process the cookie. */
1744 cookie = chunk->subh.cookie_hdr;
1745 bear_cookie = &cookie->c;
1746
1747 if (!sctp_sk(ep->base.sk)->hmac)
1748 goto no_hmac;
1749
1750 /* Check the signature. */
Herbert Xu5821c762016-01-24 21:20:12 +08001751 {
1752 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1753 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754
Herbert Xu5821c762016-01-24 21:20:12 +08001755 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1756 desc->flags = 0;
1757
1758 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1759 sizeof(ep->secret_key)) ?:
1760 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1761 digest);
1762 shash_desc_zero(desc);
1763
1764 if (err) {
1765 *error = -SCTP_IERROR_NOMEM;
1766 goto fail;
1767 }
Herbert Xu1b489e12006-08-20 15:07:14 +10001768 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
1770 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
Daniel Borkmann570617e2013-02-12 05:15:33 +00001771 *error = -SCTP_IERROR_BAD_SIG;
1772 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 }
1774
1775no_hmac:
1776 /* IG Section 2.35.2:
1777 * 3) Compare the port numbers and the verification tag contained
1778 * within the COOKIE ECHO chunk to the actual port numbers and the
1779 * verification tag within the SCTP common header of the received
1780 * packet. If these values do not match the packet MUST be silently
1781 * discarded,
1782 */
1783 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1784 *error = -SCTP_IERROR_BAD_TAG;
1785 goto fail;
1786 }
1787
Al Viro9b1dfad2006-11-20 17:09:17 -08001788 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1790 *error = -SCTP_IERROR_BAD_PORTS;
1791 goto fail;
1792 }
1793
1794 /* Check to see if the cookie is stale. If there is already
1795 * an association, there is no need to check cookie's expiration
1796 * for init collision case of lost COOKIE ACK.
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001797 * If skb has been timestamped, then use the stamp, otherwise
1798 * use current time. This introduces a small possibility that
1799 * that a cookie may be considered expired, but his would only slow
1800 * down the new association establishment instead of every packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 */
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001802 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
Daniel Borkmann52db8822013-06-25 18:17:27 +02001803 kt = skb_get_ktime(skb);
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001804 else
Marcelo Ricardo Leitnercb5e1732015-12-04 15:14:03 -02001805 kt = ktime_get_real();
Vlad Yasevichf236218b2006-09-29 17:10:03 -07001806
Daniel Borkmann67cb9362014-06-11 18:19:28 +02001807 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 /*
1809 * Section 3.3.10.3 Stale Cookie Error (3)
1810 *
1811 * Cause of error
1812 * ---------------
1813 * Stale Cookie Error: Indicates the receipt of a valid State
1814 * Cookie that has expired.
1815 */
1816 len = ntohs(chunk->chunk_hdr->length);
1817 *errp = sctp_make_op_error_space(asoc, chunk, len);
1818 if (*errp) {
Daniel Borkmann52db8822013-06-25 18:17:27 +02001819 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
Al Viro34bcca22006-11-20 17:27:15 -08001820 __be32 n = htonl(usecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001823 sizeof(n));
1824 sctp_addto_chunk(*errp, sizeof(n), &n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 *error = -SCTP_IERROR_STALE_COOKIE;
1826 } else
1827 *error = -SCTP_IERROR_NOMEM;
1828
1829 goto fail;
1830 }
1831
1832 /* Make a new base association. */
1833 scope = sctp_scope(sctp_source(chunk));
1834 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1835 if (!retval) {
1836 *error = -SCTP_IERROR_NOMEM;
1837 goto fail;
1838 }
1839
1840 /* Set up our peer's port number. */
1841 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1842
1843 /* Populate the association from the cookie. */
1844 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1845
1846 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1847 GFP_ATOMIC) < 0) {
1848 *error = -SCTP_IERROR_NOMEM;
1849 goto fail;
1850 }
1851
1852 /* Also, add the destination address. */
1853 if (list_empty(&retval->base.bind_addr.address_list)) {
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08001854 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
Marcelo Ricardo Leitner133800d2016-03-08 10:34:28 -03001855 sizeof(chunk->dest), SCTP_ADDR_SRC,
1856 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 }
1858
1859 retval->next_tsn = retval->c.initial_tsn;
1860 retval->ctsn_ack_point = retval->next_tsn - 1;
1861 retval->addip_serial = retval->c.initial_tsn;
1862 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1863 retval->peer.prsctp_capable = retval->c.prsctp_capable;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08001864 retval->peer.adaptation_ind = retval->c.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865
1866 /* The INIT stuff will be done by the side effects. */
1867 return retval;
1868
1869fail:
1870 if (retval)
1871 sctp_association_free(retval);
1872
1873 return NULL;
1874
1875malformed:
1876 /* Yikes! The packet is either corrupt or deliberately
1877 * malformed.
1878 */
1879 *error = -SCTP_IERROR_MALFORMED;
1880 goto fail;
1881}
1882
1883/********************************************************************
1884 * 3rd Level Abstractions
1885 ********************************************************************/
1886
1887struct __sctp_missing {
Al Viro9f81bcd2006-11-20 17:26:34 -08001888 __be32 num_missing;
1889 __be16 type;
Eric Dumazetbc105022010-06-03 03:21:52 -07001890} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891
1892/*
1893 * Report a missing mandatory parameter.
1894 */
1895static int sctp_process_missing_param(const struct sctp_association *asoc,
1896 sctp_param_t paramtype,
1897 struct sctp_chunk *chunk,
1898 struct sctp_chunk **errp)
1899{
1900 struct __sctp_missing report;
1901 __u16 len;
1902
1903 len = WORD_ROUND(sizeof(report));
1904
1905 /* Make an ERROR chunk, preparing enough room for
1906 * returning multiple unknown parameters.
1907 */
1908 if (!*errp)
1909 *errp = sctp_make_op_error_space(asoc, chunk, len);
1910
1911 if (*errp) {
1912 report.num_missing = htonl(1);
1913 report.type = paramtype;
Vlad Yasevichebdfcad2007-01-15 19:12:31 -08001914 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001915 sizeof(report));
1916 sctp_addto_chunk(*errp, sizeof(report), &report);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 }
1918
1919 /* Stop processing this chunk. */
1920 return 0;
1921}
1922
1923/* Report an Invalid Mandatory Parameter. */
1924static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1925 struct sctp_chunk *chunk,
1926 struct sctp_chunk **errp)
1927{
1928 /* Invalid Mandatory Parameter Error has no payload. */
1929
1930 if (!*errp)
1931 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1932
1933 if (*errp)
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001934 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935
1936 /* Stop processing this chunk. */
1937 return 0;
1938}
1939
1940static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1941 struct sctp_paramhdr *param,
1942 const struct sctp_chunk *chunk,
1943 struct sctp_chunk **errp)
1944{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001945 /* This is a fatal error. Any accumulated non-fatal errors are
1946 * not reported.
1947 */
1948 if (*errp)
1949 sctp_chunk_free(*errp);
1950
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 /* Create an error chunk and fill it in with our payload. */
Wei Yongjunba016672008-09-30 05:32:24 -07001952 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
1954 return 0;
1955}
1956
1957
1958/* Do not attempt to handle the HOST_NAME parm. However, do
1959 * send back an indicator to the peer.
1960 */
1961static int sctp_process_hn_param(const struct sctp_association *asoc,
1962 union sctp_params param,
1963 struct sctp_chunk *chunk,
1964 struct sctp_chunk **errp)
1965{
1966 __u16 len = ntohs(param.p->length);
1967
Vlad Yasevich7ab90802007-11-09 11:43:41 -05001968 /* Processing of the HOST_NAME parameter will generate an
1969 * ABORT. If we've accumulated any non-fatal errors, they
1970 * would be unrecognized parameters and we should not include
1971 * them in the ABORT.
1972 */
1973 if (*errp)
1974 sctp_chunk_free(*errp);
1975
1976 *errp = sctp_make_op_error_space(asoc, chunk, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977
Wei Yongjun00f1c2d2007-08-21 15:50:01 +08001978 if (*errp) {
1979 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1980 sctp_addto_chunk(*errp, len, param.v);
1981 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982
1983 /* Stop processing this chunk. */
1984 return 0;
1985}
1986
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00001987static int sctp_verify_ext_param(struct net *net, union sctp_params param)
Vlad Yasevichd6701192007-12-20 14:13:31 -08001988{
1989 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1990 int have_auth = 0;
1991 int have_asconf = 0;
1992 int i;
1993
1994 for (i = 0; i < num_ext; i++) {
1995 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08001996 case SCTP_CID_AUTH:
1997 have_auth = 1;
1998 break;
1999 case SCTP_CID_ASCONF:
2000 case SCTP_CID_ASCONF_ACK:
2001 have_asconf = 1;
2002 break;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002003 }
2004 }
2005
2006 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2007 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2008 * only if ADD-IP is turned on and we are not backward-compatible
2009 * mode.
2010 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002011 if (net->sctp.addip_noauth)
Vlad Yasevichd6701192007-12-20 14:13:31 -08002012 return 1;
2013
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002014 if (net->sctp.addip_enable && !have_auth && have_asconf)
Vlad Yasevichd6701192007-12-20 14:13:31 -08002015 return 0;
2016
2017 return 1;
2018}
2019
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002020static void sctp_process_ext_param(struct sctp_association *asoc,
2021 union sctp_params param)
2022{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002023 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002024 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2025 int i;
2026
2027 for (i = 0; i < num_ext; i++) {
2028 switch (param.ext->chunks[i]) {
wangweidongf7010e62013-12-23 12:16:52 +08002029 case SCTP_CID_FWD_TSN:
Xin Long28aa4c22016-07-09 19:47:40 +08002030 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2031 asoc->peer.prsctp_capable = 1;
wangweidongf7010e62013-12-23 12:16:52 +08002032 break;
2033 case SCTP_CID_AUTH:
2034 /* if the peer reports AUTH, assume that he
2035 * supports AUTH.
2036 */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002037 if (asoc->ep->auth_enable)
wangweidongf7010e62013-12-23 12:16:52 +08002038 asoc->peer.auth_capable = 1;
2039 break;
2040 case SCTP_CID_ASCONF:
2041 case SCTP_CID_ASCONF_ACK:
2042 if (net->sctp.addip_enable)
2043 asoc->peer.asconf_capable = 1;
2044 break;
2045 default:
2046 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002047 }
2048 }
2049}
2050
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051/* RFC 3.2.1 & the Implementers Guide 2.2.
2052 *
2053 * The Parameter Types are encoded such that the
2054 * highest-order two bits specify the action that must be
2055 * taken if the processing endpoint does not recognize the
2056 * Parameter Type.
2057 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002058 * 00 - Stop processing this parameter; do not process any further
2059 * parameters within this chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060 *
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002061 * 01 - Stop processing this parameter, do not process any further
2062 * parameters within this chunk, and report the unrecognized
2063 * parameter in an 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 *
2065 * 10 - Skip this parameter and continue processing.
2066 *
2067 * 11 - Skip this parameter and continue processing but
2068 * report the unrecognized parameter in an
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002069 * 'Unrecognized Parameter' ERROR chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 *
2071 * Return value:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002072 * SCTP_IERROR_NO_ERROR - continue with the chunk
2073 * SCTP_IERROR_ERROR - stop and report an error.
2074 * SCTP_IERROR_NOMEME - out of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002076static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2077 union sctp_params param,
2078 struct sctp_chunk *chunk,
2079 struct sctp_chunk **errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080{
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002081 int retval = SCTP_IERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082
2083 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2084 case SCTP_PARAM_ACTION_DISCARD:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002085 retval = SCTP_IERROR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086 break;
2087 case SCTP_PARAM_ACTION_SKIP:
2088 break;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002089 case SCTP_PARAM_ACTION_DISCARD_ERR:
2090 retval = SCTP_IERROR_ERROR;
2091 /* Fall through */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 case SCTP_PARAM_ACTION_SKIP_ERR:
2093 /* Make an ERROR chunk, preparing enough room for
2094 * returning multiple unknown parameters.
2095 */
2096 if (NULL == *errp)
Neil Horman5fa782c2010-04-28 10:30:59 +00002097 *errp = sctp_make_op_error_fixed(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
2099 if (*errp) {
Jiri Bohac2205a6e2011-02-17 13:12:08 +00002100 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2101 WORD_ROUND(ntohs(param.p->length))))
2102 sctp_addto_chunk_fixed(*errp,
2103 WORD_ROUND(ntohs(param.p->length)),
2104 param.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 } else {
2106 /* If there is no memory for generating the ERROR
2107 * report as specified, an ABORT will be triggered
2108 * to the peer and the association won't be
2109 * established.
2110 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002111 retval = SCTP_IERROR_NOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 break;
2114 default:
2115 break;
2116 }
2117
2118 return retval;
2119}
2120
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002121/* Verify variable length parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 * Return values:
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002123 * SCTP_IERROR_ABORT - trigger an ABORT
2124 * SCTP_IERROR_NOMEM - out of memory (abort)
2125 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2126 * SCTP_IERROR_NO_ERROR - continue with the chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 */
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002128static sctp_ierror_t sctp_verify_param(struct net *net,
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002129 const struct sctp_endpoint *ep,
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002130 const struct sctp_association *asoc,
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002131 union sctp_params param,
2132 sctp_cid_t cid,
2133 struct sctp_chunk *chunk,
2134 struct sctp_chunk **err_chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135{
Wei Yongjun72da7b32008-04-12 18:39:19 -07002136 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002137 int retval = SCTP_IERROR_NO_ERROR;
Wei Yongjun72da7b32008-04-12 18:39:19 -07002138 __u16 n_elt, id = 0;
2139 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140
2141 /* FIXME - This routine is not looking at each parameter per the
2142 * chunk type, i.e., unrecognized parameters should be further
2143 * identified based on the chunk id.
2144 */
2145
2146 switch (param.p->type) {
2147 case SCTP_PARAM_IPV4_ADDRESS:
2148 case SCTP_PARAM_IPV6_ADDRESS:
2149 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2150 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2151 case SCTP_PARAM_STATE_COOKIE:
2152 case SCTP_PARAM_HEARTBEAT_INFO:
2153 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2154 case SCTP_PARAM_ECN_CAPABLE:
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002155 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yasevichd6701192007-12-20 14:13:31 -08002156 break;
2157
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002158 case SCTP_PARAM_SUPPORTED_EXT:
Eric W. Biedermanf53b5b02012-08-07 07:29:08 +00002159 if (!sctp_verify_ext_param(net, param))
Vlad Yasevichd6701192007-12-20 14:13:31 -08002160 return SCTP_IERROR_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 break;
2162
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002163 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002164 if (net->sctp.addip_enable)
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002165 break;
2166 goto fallthrough;
2167
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168 case SCTP_PARAM_HOST_NAME_ADDRESS:
2169 /* Tell the peer, we won't support this param. */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002170 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2171 retval = SCTP_IERROR_ABORT;
2172 break;
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002173
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 case SCTP_PARAM_FWD_TSN_SUPPORT:
Xin Long28aa4c22016-07-09 19:47:40 +08002175 if (ep->prsctp_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002176 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002177 goto fallthrough;
2178
2179 case SCTP_PARAM_RANDOM:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002180 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002181 goto fallthrough;
2182
2183 /* SCTP-AUTH: Secion 6.1
2184 * If the random number is not 32 byte long the association
2185 * MUST be aborted. The ABORT chunk SHOULD contain the error
2186 * cause 'Protocol Violation'.
2187 */
2188 if (SCTP_AUTH_RANDOM_LENGTH !=
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002189 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2190 sctp_process_inv_paramlength(asoc, param.p,
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002191 chunk, err_chunk);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002192 retval = SCTP_IERROR_ABORT;
2193 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002194 break;
2195
2196 case SCTP_PARAM_CHUNKS:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002197 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002198 goto fallthrough;
2199
2200 /* SCTP-AUTH: Section 3.2
2201 * The CHUNKS parameter MUST be included once in the INIT or
2202 * INIT-ACK chunk if the sender wants to receive authenticated
2203 * chunks. Its maximum length is 260 bytes.
2204 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002205 if (260 < ntohs(param.p->length)) {
2206 sctp_process_inv_paramlength(asoc, param.p,
2207 chunk, err_chunk);
2208 retval = SCTP_IERROR_ABORT;
2209 }
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002210 break;
2211
2212 case SCTP_PARAM_HMAC_ALGO:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002213 if (!ep->auth_enable)
Wei Yongjun72da7b32008-04-12 18:39:19 -07002214 goto fallthrough;
2215
2216 hmacs = (struct sctp_hmac_algo_param *)param.p;
2217 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2218
2219 /* SCTP-AUTH: Section 6.1
2220 * The HMAC algorithm based on SHA-1 MUST be supported and
2221 * included in the HMAC-ALGO parameter.
2222 */
2223 for (i = 0; i < n_elt; i++) {
2224 id = ntohs(hmacs->hmac_ids[i]);
2225
2226 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2227 break;
2228 }
2229
2230 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2231 sctp_process_inv_paramlength(asoc, param.p, chunk,
2232 err_chunk);
2233 retval = SCTP_IERROR_ABORT;
2234 }
2235 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002236fallthrough:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 default:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002238 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2239 __func__, ntohs(param.p->type), cid);
2240
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002241 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 break;
2243 }
2244 return retval;
2245}
2246
2247/* Verify the INIT packet before we process it. */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002248int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2249 const struct sctp_association *asoc, sctp_cid_t cid,
2250 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 struct sctp_chunk **errp)
2252{
2253 union sctp_params param;
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002254 bool has_cookie = false;
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002255 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002257 /* Check for missing mandatory parameters. Note: Initial TSN is
2258 * also mandatory, but is not checked here since the valid range
2259 * is 0..2**32-1. RFC4960, section 3.3.3.
2260 */
2261 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2262 peer_init->init_hdr.num_inbound_streams == 0 ||
2263 peer_init->init_hdr.init_tag == 0 ||
2264 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002265 return sctp_process_inv_mandatory(asoc, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 sctp_walk_params(param, peer_init, init_hdr.params) {
Daniel Borkmann7613f5f2013-08-27 16:53:52 +02002268 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2269 has_cookie = true;
2270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271
2272 /* There is a possibility that a parameter length was bad and
2273 * in that case we would have stoped walking the parameters.
2274 * The current param.p would point at the bad one.
2275 * Current consensus on the mailing list is to generate a PROTOCOL
2276 * VIOLATION error. We build the ERROR chunk here and let the normal
2277 * error handling code build and send the packet.
2278 */
wangweidong26ac8e52013-12-23 12:16:51 +08002279 if (param.v != (void *)chunk->chunk_end)
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002280 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281
2282 /* The only missing mandatory param possible today is
2283 * the state cookie for an INIT-ACK chunk.
2284 */
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002285 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2286 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2287 chunk, errp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002289 /* Verify all the variable length parameters */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 sctp_walk_params(param, peer_init, init_hdr.params) {
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002291 result = sctp_verify_param(net, ep, asoc, param, cid,
2292 chunk, errp);
Vlad Yasevich7ab90802007-11-09 11:43:41 -05002293 switch (result) {
wangweidongf7010e62013-12-23 12:16:52 +08002294 case SCTP_IERROR_ABORT:
2295 case SCTP_IERROR_NOMEM:
2296 return 0;
2297 case SCTP_IERROR_ERROR:
2298 return 1;
2299 case SCTP_IERROR_NO_ERROR:
2300 default:
2301 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302 }
2303
2304 } /* for (loop through all parameters) */
2305
2306 return 1;
2307}
2308
2309/* Unpack the parameters in an INIT packet into an association.
2310 * Returns 0 on failure, else success.
2311 * FIXME: This is an association method.
2312 */
Wei Yongjunde6becd2011-04-19 21:30:51 +00002313int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002315 sctp_init_chunk_t *peer_init, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002317 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 union sctp_params param;
2319 struct sctp_transport *transport;
2320 struct list_head *pos, *temp;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002321 struct sctp_af *af;
2322 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 char *cookie;
Wei Yongjunde6becd2011-04-19 21:30:51 +00002324 int src_match = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325
2326 /* We must include the address that the INIT packet came from.
2327 * This is the only address that matters for an INIT packet.
2328 * When processing a COOKIE ECHO, we retrieve the from address
2329 * of the INIT from the cookie.
2330 */
2331
2332 /* This implementation defaults to making the first transport
2333 * added as the primary transport. The source address seems to
2334 * be a a better choice than any of the embedded addresses.
2335 */
wangweidongcb3f8372013-12-23 12:16:50 +08002336 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
Wei Yongjunde6becd2011-04-19 21:30:51 +00002337 goto nomem;
2338
2339 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2340 src_match = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341
2342 /* Process the initialization parameters. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 sctp_walk_params(param, peer_init, init_hdr.params) {
Wei Yongjunde6becd2011-04-19 21:30:51 +00002344 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2345 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2346 af = sctp_get_af_specific(param_type2af(param.p->type));
2347 af->from_addr_param(&addr, param.addr,
2348 chunk->sctp_hdr->source, 0);
2349 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2350 src_match = 1;
2351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352
2353 if (!sctp_process_param(asoc, param, peer_addr, gfp))
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002354 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 }
2356
Wei Yongjunde6becd2011-04-19 21:30:51 +00002357 /* source address of chunk may not match any valid address */
2358 if (!src_match)
2359 goto clean_up;
2360
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002361 /* AUTH: After processing the parameters, make sure that we
2362 * have all the required info to potentially do authentications.
2363 */
2364 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2365 !asoc->peer.peer_hmacs))
2366 asoc->peer.auth_capable = 0;
2367
Vlad Yasevichd6701192007-12-20 14:13:31 -08002368 /* In a non-backward compatible mode, if the peer claims
2369 * support for ADD-IP but not AUTH, the ADD-IP spec states
2370 * that we MUST ABORT the association. Section 6. The section
2371 * also give us an option to silently ignore the packet, which
2372 * is what we'll do here.
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002373 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002374 if (!net->sctp.addip_noauth &&
Vlad Yasevich73d9c4f2007-10-24 17:24:26 -04002375 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002376 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2377 SCTP_PARAM_DEL_IP |
2378 SCTP_PARAM_SET_PRIMARY);
Vlad Yasevich88799fe2007-10-24 17:24:23 -04002379 asoc->peer.asconf_capable = 0;
Vlad Yasevichd6701192007-12-20 14:13:31 -08002380 goto clean_up;
Vlad Yasevich6b2f9cb2007-09-16 19:35:39 -07002381 }
2382
Frank Filz3f7a87d2005-06-20 13:14:57 -07002383 /* Walk list of transports, removing transports in the UNKNOWN state. */
2384 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2385 transport = list_entry(pos, struct sctp_transport, transports);
2386 if (transport->state == SCTP_UNKNOWN) {
2387 sctp_assoc_rm_peer(asoc, transport);
2388 }
2389 }
2390
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 /* The fixed INIT headers are always in network byte
2392 * order.
2393 */
2394 asoc->peer.i.init_tag =
2395 ntohl(peer_init->init_hdr.init_tag);
2396 asoc->peer.i.a_rwnd =
2397 ntohl(peer_init->init_hdr.a_rwnd);
2398 asoc->peer.i.num_outbound_streams =
2399 ntohs(peer_init->init_hdr.num_outbound_streams);
2400 asoc->peer.i.num_inbound_streams =
2401 ntohs(peer_init->init_hdr.num_inbound_streams);
2402 asoc->peer.i.initial_tsn =
2403 ntohl(peer_init->init_hdr.initial_tsn);
2404
2405 /* Apply the upper bounds for output streams based on peer's
2406 * number of inbound streams.
2407 */
2408 if (asoc->c.sinit_num_ostreams >
2409 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2410 asoc->c.sinit_num_ostreams =
2411 ntohs(peer_init->init_hdr.num_inbound_streams);
2412 }
2413
2414 if (asoc->c.sinit_max_instreams >
2415 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2416 asoc->c.sinit_max_instreams =
2417 ntohs(peer_init->init_hdr.num_outbound_streams);
2418 }
2419
2420 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2421 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2422
2423 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2424 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2425
2426 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2427 cookie = asoc->peer.cookie;
2428 if (cookie) {
Arnaldo Carvalho de Meloaf997d82006-11-21 01:20:33 -02002429 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430 if (!asoc->peer.cookie)
2431 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432 }
2433
2434 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2435 * high (for example, implementations MAY use the size of the receiver
2436 * advertised window).
2437 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002438 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2439 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 transport->ssthresh = asoc->peer.i.a_rwnd;
2441 }
2442
2443 /* Set up the TSN tracking pieces. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07002444 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2445 asoc->peer.i.initial_tsn, gfp))
2446 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447
2448 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2449 *
2450 * The stream sequence number in all the streams shall start
2451 * from 0 when the association is established. Also, when the
2452 * stream sequence number reaches the value 65535 the next
2453 * stream sequence number shall be set to 0.
2454 */
2455
Frank Filz3f7a87d2005-06-20 13:14:57 -07002456 /* Allocate storage for the negotiated streams if it is not a temporary
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002457 * association.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458 */
2459 if (!asoc->temp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 int error;
2461
2462 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2463 asoc->c.sinit_num_ostreams, gfp);
2464 if (!asoc->ssnmap)
2465 goto clean_up;
2466
Vlad Yasevich07d93962007-05-04 13:55:27 -07002467 error = sctp_assoc_set_id(asoc, gfp);
2468 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 goto clean_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 }
2471
2472 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2473 *
2474 * When an endpoint has an ASCONF signaled change to be sent to the
2475 * remote endpoint it should do the following:
2476 * ...
2477 * A2) A serial number should be assigned to the Chunk. The serial
2478 * number should be a monotonically increasing number. All serial
2479 * numbers are defined to be initialized at the start of the
2480 * association to the same value as the Initial TSN.
2481 */
2482 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2483 return 1;
2484
2485clean_up:
2486 /* Release the transport structures. */
2487 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2488 transport = list_entry(pos, struct sctp_transport, transports);
Vlad Yasevichadd52372008-09-18 16:28:27 -07002489 if (transport->state != SCTP_ACTIVE)
2490 sctp_assoc_rm_peer(asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07002492
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493nomem:
2494 return 0;
2495}
2496
2497
2498/* Update asoc with the option described in param.
2499 *
2500 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2501 *
2502 * asoc is the association to update.
2503 * param is the variable length parameter to use for update.
2504 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2505 * If the current packet is an INIT we want to minimize the amount of
2506 * work we do. In particular, we should not build transport
2507 * structures for the addresses.
2508 */
2509static int sctp_process_param(struct sctp_association *asoc,
2510 union sctp_params param,
2511 const union sctp_addr *peer_addr,
Al Virodd0fc662005-10-07 07:46:04 +01002512 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513{
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002514 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 union sctp_addr addr;
2516 int i;
2517 __u16 sat;
2518 int retval = 1;
2519 sctp_scope_t scope;
Arnd Bergmann3ef0a252015-09-30 13:26:40 +02002520 u32 stale;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 struct sctp_af *af;
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002522 union sctp_addr_param *addr_param;
2523 struct sctp_transport *t;
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002524 struct sctp_endpoint *ep = asoc->ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525
2526 /* We maintain all INIT parameters in network byte order all the
2527 * time. This allows us to not worry about whether the parameters
2528 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2529 */
2530 switch (param.p->type) {
2531 case SCTP_PARAM_IPV6_ADDRESS:
2532 if (PF_INET6 != asoc->base.sk->sk_family)
2533 break;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002534 goto do_addr_param;
2535
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 case SCTP_PARAM_IPV4_ADDRESS:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07002537 /* v4 addresses are not allowed on v6-only socket */
2538 if (ipv6_only_sock(asoc->base.sk))
2539 break;
2540do_addr_param:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541 af = sctp_get_af_specific(param_type2af(param.p->type));
Al Virodd86d132006-11-20 17:11:13 -08002542 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543 scope = sctp_scope(peer_addr);
Eric W. Biedermane7ff4a72012-08-07 07:27:02 +00002544 if (sctp_in_scope(net, &addr, scope))
Al Virodd86d132006-11-20 17:11:13 -08002545 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546 return 0;
2547 break;
2548
2549 case SCTP_PARAM_COOKIE_PRESERVATIVE:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002550 if (!net->sctp.cookie_preserve_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002551 break;
2552
2553 stale = ntohl(param.life->lifespan_increment);
2554
2555 /* Suggested Cookie Life span increment's unit is msec,
2556 * (1/1000sec).
2557 */
Daniel Borkmann52db8822013-06-25 18:17:27 +02002558 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002559 break;
2560
2561 case SCTP_PARAM_HOST_NAME_ADDRESS:
Daniel Borkmannbb333812013-06-28 19:49:40 +02002562 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 break;
2564
2565 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2566 /* Turn off the default values first so we'll know which
2567 * ones are really set by the peer.
2568 */
2569 asoc->peer.ipv4_address = 0;
2570 asoc->peer.ipv6_address = 0;
2571
Gui Jianfeng140ee962008-03-05 13:43:32 -08002572 /* Assume that peer supports the address family
2573 * by which it sends a packet.
2574 */
2575 if (peer_addr->sa.sa_family == AF_INET6)
2576 asoc->peer.ipv6_address = 1;
2577 else if (peer_addr->sa.sa_family == AF_INET)
2578 asoc->peer.ipv4_address = 1;
2579
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580 /* Cycle through address types; avoid divide by 0. */
2581 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2582 if (sat)
2583 sat /= sizeof(__u16);
2584
2585 for (i = 0; i < sat; ++i) {
2586 switch (param.sat->types[i]) {
2587 case SCTP_PARAM_IPV4_ADDRESS:
2588 asoc->peer.ipv4_address = 1;
2589 break;
2590
2591 case SCTP_PARAM_IPV6_ADDRESS:
Wei Yongjun6e40a912008-05-09 15:11:17 -07002592 if (PF_INET6 == asoc->base.sk->sk_family)
2593 asoc->peer.ipv6_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 break;
2595
2596 case SCTP_PARAM_HOST_NAME_ADDRESS:
2597 asoc->peer.hostname_address = 1;
2598 break;
2599
2600 default: /* Just ignore anything else. */
2601 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002602 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 }
2604 break;
2605
2606 case SCTP_PARAM_STATE_COOKIE:
2607 asoc->peer.cookie_len =
2608 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2609 asoc->peer.cookie = param.cookie->body;
2610 break;
2611
2612 case SCTP_PARAM_HEARTBEAT_INFO:
2613 /* Would be odd to receive, but it causes no problems. */
2614 break;
2615
2616 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2617 /* Rejected during verify stage. */
2618 break;
2619
2620 case SCTP_PARAM_ECN_CAPABLE:
2621 asoc->peer.ecn_capable = 1;
2622 break;
2623
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08002624 case SCTP_PARAM_ADAPTATION_LAYER_IND:
Vlad Yaseviche69c4e02008-09-15 16:29:49 -04002625 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 break;
2627
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002628 case SCTP_PARAM_SET_PRIMARY:
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00002629 if (!net->sctp.addip_enable)
Vlad Yasevich0ef46e22008-09-18 16:27:38 -07002630 goto fall_through;
2631
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002632 addr_param = param.v + sizeof(sctp_addip_param_t);
2633
Saran Maruti Ramanaracfbf6542015-01-29 11:05:58 +01002634 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Daniel Borkmanne40607c2014-11-10 17:54:26 +01002635 if (af == NULL)
2636 break;
2637
Vlad Yasevichd6de3092007-12-20 14:10:00 -08002638 af->from_addr_param(&addr, addr_param,
2639 htons(asoc->peer.port), 0);
2640
2641 /* if the address is invalid, we can't process it.
2642 * XXX: see spec for what to do.
2643 */
2644 if (!af->addr_valid(&addr, NULL, NULL))
2645 break;
2646
2647 t = sctp_assoc_lookup_paddr(asoc, &addr);
2648 if (!t)
2649 break;
2650
2651 sctp_assoc_set_primary(asoc, t);
2652 break;
2653
Vlad Yasevich131a47e2007-09-16 15:53:56 -07002654 case SCTP_PARAM_SUPPORTED_EXT:
2655 sctp_process_ext_param(asoc, param);
2656 break;
2657
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658 case SCTP_PARAM_FWD_TSN_SUPPORT:
Xin Long28aa4c22016-07-09 19:47:40 +08002659 if (asoc->prsctp_enable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 asoc->peer.prsctp_capable = 1;
2661 break;
2662 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002663 /* Fall Through */
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002664 goto fall_through;
2665
2666 case SCTP_PARAM_RANDOM:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002667 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002668 goto fall_through;
2669
2670 /* Save peer's random parameter */
2671 asoc->peer.peer_random = kmemdup(param.p,
2672 ntohs(param.p->length), gfp);
2673 if (!asoc->peer.peer_random) {
2674 retval = 0;
2675 break;
2676 }
2677 break;
2678
2679 case SCTP_PARAM_HMAC_ALGO:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002680 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002681 goto fall_through;
2682
2683 /* Save peer's HMAC list */
2684 asoc->peer.peer_hmacs = kmemdup(param.p,
2685 ntohs(param.p->length), gfp);
2686 if (!asoc->peer.peer_hmacs) {
2687 retval = 0;
2688 break;
2689 }
2690
2691 /* Set the default HMAC the peer requested*/
2692 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2693 break;
2694
2695 case SCTP_PARAM_CHUNKS:
Vlad Yasevichb14878c2014-04-17 17:26:50 +02002696 if (!ep->auth_enable)
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07002697 goto fall_through;
2698
2699 asoc->peer.peer_chunks = kmemdup(param.p,
2700 ntohs(param.p->length), gfp);
2701 if (!asoc->peer.peer_chunks)
2702 retval = 0;
2703 break;
2704fall_through:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 default:
2706 /* Any unrecognized parameters should have been caught
2707 * and handled by sctp_verify_param() which should be
2708 * called prior to this routine. Simply log the error
2709 * here.
2710 */
Daniel Borkmannbb333812013-06-28 19:49:40 +02002711 pr_debug("%s: ignoring param:%d for association:%p.\n",
2712 __func__, ntohs(param.p->type), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002714 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715
2716 return retval;
2717}
2718
2719/* Select a new verification tag. */
2720__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2721{
2722 /* I believe that this random number generator complies with RFC1750.
2723 * A tag of 0 is reserved for special cases (e.g. INIT).
2724 */
2725 __u32 x;
2726
2727 do {
2728 get_random_bytes(&x, sizeof(__u32));
2729 } while (x == 0);
2730
2731 return x;
2732}
2733
2734/* Select an initial TSN to send during startup. */
2735__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2736{
2737 __u32 retval;
2738
2739 get_random_bytes(&retval, sizeof(__u32));
2740 return retval;
2741}
2742
2743/*
2744 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2745 * 0 1 2 3
2746 * 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
2747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2748 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * | Serial Number |
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2752 * | Address Parameter |
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | ASCONF Parameter #1 |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * \ \
2757 * / .... /
2758 * \ \
2759 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2760 * | ASCONF Parameter #N |
2761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2762 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002763 * Address Parameter and other parameter will not be wrapped in this function
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764 */
2765static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2766 union sctp_addr *addr,
2767 int vparam_len)
2768{
2769 sctp_addiphdr_t asconf;
2770 struct sctp_chunk *retval;
2771 int length = sizeof(asconf) + vparam_len;
2772 union sctp_addr_param addrparam;
2773 int addrlen;
2774 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2775
2776 addrlen = af->to_addr_param(addr, &addrparam);
2777 if (!addrlen)
2778 return NULL;
2779 length += addrlen;
2780
2781 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03002782 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2783 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 if (!retval)
2785 return NULL;
2786
2787 asconf.serial = htonl(asoc->addip_serial++);
2788
2789 retval->subh.addip_hdr =
2790 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2791 retval->param_hdr.v =
2792 sctp_addto_chunk(retval, addrlen, &addrparam);
2793
2794 return retval;
2795}
2796
2797/* ADDIP
2798 * 3.2.1 Add IP Address
2799 * 0 1 2 3
2800 * 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
2801 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2802 * | Type = 0xC001 | Length = Variable |
2803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2804 * | ASCONF-Request Correlation ID |
2805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2806 * | Address Parameter |
2807 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2808 *
2809 * 3.2.2 Delete IP Address
2810 * 0 1 2 3
2811 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2813 * | Type = 0xC002 | Length = Variable |
2814 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2815 * | ASCONF-Request Correlation ID |
2816 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2817 * | Address Parameter |
2818 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2819 *
2820 */
2821struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2822 union sctp_addr *laddr,
2823 struct sockaddr *addrs,
2824 int addrcnt,
Al Virodbc16db2006-11-20 17:01:42 -08002825 __be16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826{
2827 sctp_addip_param_t param;
2828 struct sctp_chunk *retval;
2829 union sctp_addr_param addr_param;
2830 union sctp_addr *addr;
2831 void *addr_buf;
2832 struct sctp_af *af;
2833 int paramlen = sizeof(param);
2834 int addr_param_len = 0;
2835 int totallen = 0;
2836 int i;
Michio Honda8a07eb02011-04-26 20:19:36 +09002837 int del_pickup = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838
2839 /* Get total length of all the address parameters. */
2840 addr_buf = addrs;
2841 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002842 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 af = sctp_get_af_specific(addr->v4.sin_family);
2844 addr_param_len = af->to_addr_param(addr, &addr_param);
2845
2846 totallen += paramlen;
2847 totallen += addr_param_len;
2848
2849 addr_buf += af->sockaddr_len;
Michio Honda8a07eb02011-04-26 20:19:36 +09002850 if (asoc->asconf_addr_del_pending && !del_pickup) {
2851 /* reuse the parameter length from the same scope one */
2852 totallen += paramlen;
2853 totallen += addr_param_len;
2854 del_pickup = 1;
Daniel Borkmannbb333812013-06-28 19:49:40 +02002855
2856 pr_debug("%s: picked same-scope del_pending addr, "
2857 "totallen for all addresses is %d\n",
2858 __func__, totallen);
Michio Honda8a07eb02011-04-26 20:19:36 +09002859 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002860 }
2861
2862 /* Create an asconf chunk with the required length. */
2863 retval = sctp_make_asconf(asoc, laddr, totallen);
2864 if (!retval)
2865 return NULL;
2866
2867 /* Add the address parameters to the asconf chunk. */
2868 addr_buf = addrs;
2869 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +00002870 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 af = sctp_get_af_specific(addr->v4.sin_family);
2872 addr_param_len = af->to_addr_param(addr, &addr_param);
2873 param.param_hdr.type = flags;
2874 param.param_hdr.length = htons(paramlen + addr_param_len);
2875 param.crr_id = i;
2876
2877 sctp_addto_chunk(retval, paramlen, &param);
2878 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2879
2880 addr_buf += af->sockaddr_len;
2881 }
Michio Honda8a07eb02011-04-26 20:19:36 +09002882 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2883 addr = asoc->asconf_addr_del_pending;
2884 af = sctp_get_af_specific(addr->v4.sin_family);
2885 addr_param_len = af->to_addr_param(addr, &addr_param);
2886 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2887 param.param_hdr.length = htons(paramlen + addr_param_len);
2888 param.crr_id = i;
2889
2890 sctp_addto_chunk(retval, paramlen, &param);
2891 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2892 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893 return retval;
2894}
2895
2896/* ADDIP
2897 * 3.2.4 Set Primary IP Address
2898 * 0 1 2 3
2899 * 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
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | Type =0xC004 | Length = Variable |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2903 * | ASCONF-Request Correlation ID |
2904 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2905 * | Address Parameter |
2906 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2907 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002908 * Create an ASCONF chunk with Set Primary IP address parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 */
2910struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2911 union sctp_addr *addr)
2912{
2913 sctp_addip_param_t param;
2914 struct sctp_chunk *retval;
2915 int len = sizeof(param);
2916 union sctp_addr_param addrparam;
2917 int addrlen;
2918 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2919
2920 addrlen = af->to_addr_param(addr, &addrparam);
2921 if (!addrlen)
2922 return NULL;
2923 len += addrlen;
2924
2925 /* Create the chunk and make asconf header. */
2926 retval = sctp_make_asconf(asoc, addr, len);
2927 if (!retval)
2928 return NULL;
2929
2930 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2931 param.param_hdr.length = htons(len);
2932 param.crr_id = 0;
2933
2934 sctp_addto_chunk(retval, sizeof(param), &param);
2935 sctp_addto_chunk(retval, addrlen, &addrparam);
2936
2937 return retval;
2938}
2939
2940/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2941 * 0 1 2 3
2942 * 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
2943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * | Type = 0x80 | Chunk Flags | Chunk Length |
2945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2946 * | Serial Number |
2947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2948 * | ASCONF Parameter Response#1 |
2949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2950 * \ \
2951 * / .... /
2952 * \ \
2953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2954 * | ASCONF Parameter Response#N |
2955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2956 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002957 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 */
2959static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2960 __u32 serial, int vparam_len)
2961{
2962 sctp_addiphdr_t asconf;
2963 struct sctp_chunk *retval;
2964 int length = sizeof(asconf) + vparam_len;
2965
2966 /* Create the chunk. */
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03002967 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2968 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969 if (!retval)
2970 return NULL;
2971
2972 asconf.serial = htonl(serial);
2973
2974 retval->subh.addip_hdr =
2975 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2976
2977 return retval;
2978}
2979
2980/* Add response parameters to an ASCONF_ACK chunk. */
Al Viro9f81bcd2006-11-20 17:26:34 -08002981static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
Al Virodbc16db2006-11-20 17:01:42 -08002982 __be16 err_code, sctp_addip_param_t *asconf_param)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983{
2984 sctp_addip_param_t ack_param;
2985 sctp_errhdr_t err_param;
2986 int asconf_param_len = 0;
2987 int err_param_len = 0;
Al Virodbc16db2006-11-20 17:01:42 -08002988 __be16 response_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989
2990 if (SCTP_ERROR_NO_ERROR == err_code) {
2991 response_type = SCTP_PARAM_SUCCESS_REPORT;
2992 } else {
2993 response_type = SCTP_PARAM_ERR_CAUSE;
2994 err_param_len = sizeof(err_param);
2995 if (asconf_param)
2996 asconf_param_len =
2997 ntohs(asconf_param->param_hdr.length);
2998 }
2999
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003000 /* Add Success Indication or Error Cause Indication parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003001 ack_param.param_hdr.type = response_type;
3002 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3003 err_param_len +
3004 asconf_param_len);
3005 ack_param.crr_id = crr_id;
3006 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3007
3008 if (SCTP_ERROR_NO_ERROR == err_code)
3009 return;
3010
3011 /* Add Error Cause parameter. */
3012 err_param.cause = err_code;
3013 err_param.length = htons(err_param_len + asconf_param_len);
3014 sctp_addto_chunk(chunk, err_param_len, &err_param);
3015
3016 /* Add the failed TLV copied from ASCONF chunk. */
3017 if (asconf_param)
3018 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3019}
3020
3021/* Process a asconf parameter. */
Al Virodbc16db2006-11-20 17:01:42 -08003022static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023 struct sctp_chunk *asconf,
3024 sctp_addip_param_t *asconf_param)
3025{
3026 struct sctp_transport *peer;
3027 struct sctp_af *af;
3028 union sctp_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029 union sctp_addr_param *addr_param;
Al Viro5f242a12006-11-20 17:05:23 -08003030
Joe Perchesea110732011-06-13 16:21:26 +00003031 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Patrick McHardyc1cc6782008-05-13 23:25:00 -07003032
Wei Yongjun44e65c12009-06-16 14:48:24 +08003033 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3034 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3035 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3036 return SCTP_ERROR_UNKNOWN_PARAM;
3037
Shan Wei6a435732011-04-18 19:11:47 +00003038 switch (addr_param->p.type) {
Wei Yongjunc4492582008-05-09 15:11:53 -07003039 case SCTP_PARAM_IPV6_ADDRESS:
3040 if (!asoc->peer.ipv6_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003041 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003042 break;
3043 case SCTP_PARAM_IPV4_ADDRESS:
3044 if (!asoc->peer.ipv4_address)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003045 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003046 break;
3047 default:
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003048 return SCTP_ERROR_DNS_FAILED;
Wei Yongjunc4492582008-05-09 15:11:53 -07003049 }
3050
Shan Wei6a435732011-04-18 19:11:47 +00003051 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052 if (unlikely(!af))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003053 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054
Al Virodd86d132006-11-20 17:11:13 -08003055 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003056
3057 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3058 * or multicast address.
3059 * (note: wildcard is permitted and requires special handling so
3060 * make sure we check for that)
3061 */
3062 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003063 return SCTP_ERROR_DNS_FAILED;
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003064
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065 switch (asconf_param->param_hdr.type) {
3066 case SCTP_PARAM_ADD_IP:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003067 /* Section 4.2.1:
3068 * If the address 0.0.0.0 or ::0 is provided, the source
3069 * address of the packet MUST be added.
3070 */
3071 if (af->is_any(&addr))
3072 memcpy(&addr, &asconf->source, sizeof(addr));
3073
Linus Torvalds1da177e2005-04-16 15:20:36 -07003074 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003075 * request and does not have the local resources to add this
3076 * new address to the association, it MUST return an Error
3077 * Cause TLV set to the new error code 'Operation Refused
3078 * Due to Resource Shortage'.
3079 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080
Al Virodd86d132006-11-20 17:11:13 -08003081 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082 if (!peer)
3083 return SCTP_ERROR_RSRC_LOW;
3084
3085 /* Start the heartbeat timer. */
Marcelo Ricardo Leitnerba6f5e32016-04-06 15:15:19 -03003086 sctp_transport_reset_hb_timer(peer);
Michio Honda6af29cc2011-06-16 17:14:34 +09003087 asoc->new_transport = peer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088 break;
3089 case SCTP_PARAM_DEL_IP:
3090 /* ADDIP 4.3 D7) If a request is received to delete the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003091 * last remaining IP address of a peer endpoint, the receiver
3092 * MUST send an Error Cause TLV with the error cause set to the
3093 * new error code 'Request to Delete Last Remaining IP Address'.
3094 */
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003095 if (asoc->peer.transport_count == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003096 return SCTP_ERROR_DEL_LAST_IP;
3097
3098 /* ADDIP 4.3 D8) If a request is received to delete an IP
3099 * address which is also the source address of the IP packet
3100 * which contained the ASCONF chunk, the receiver MUST reject
3101 * this request. To reject the request the receiver MUST send
3102 * an Error Cause TLV set to the new error code 'Request to
3103 * Delete Source IP Address'
3104 */
Michio Hondab1364102011-04-26 17:37:02 +09003105 if (sctp_cmp_addr_exact(&asconf->source, &addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106 return SCTP_ERROR_DEL_SRC_IP;
3107
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003108 /* Section 4.2.2
3109 * If the address 0.0.0.0 or ::0 is provided, all
3110 * addresses of the peer except the source address of the
3111 * packet MUST be deleted.
3112 */
3113 if (af->is_any(&addr)) {
3114 sctp_assoc_set_primary(asoc, asconf->transport);
3115 sctp_assoc_del_nonprimary_peers(asoc,
3116 asconf->transport);
lucien7c5a9462015-08-28 17:45:58 +08003117 return SCTP_ERROR_NO_ERROR;
3118 }
3119
3120 /* If the address is not part of the association, the
3121 * ASCONF-ACK with Error Cause Indication Parameter
3122 * which including cause of Unresolvable Address should
3123 * be sent.
3124 */
3125 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3126 if (!peer)
3127 return SCTP_ERROR_DNS_FAILED;
3128
3129 sctp_assoc_rm_peer(asoc, peer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003130 break;
3131 case SCTP_PARAM_SET_PRIMARY:
Vlad Yasevich42e30bf2007-12-20 14:08:56 -08003132 /* ADDIP Section 4.2.4
3133 * If the address 0.0.0.0 or ::0 is provided, the receiver
3134 * MAY mark the source address of the packet as its
3135 * primary.
3136 */
3137 if (af->is_any(&addr))
3138 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3139
Al Virodd86d132006-11-20 17:11:13 -08003140 peer = sctp_assoc_lookup_paddr(asoc, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141 if (!peer)
Wei Yongjun945e5ab2009-04-16 14:21:02 +08003142 return SCTP_ERROR_DNS_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143
3144 sctp_assoc_set_primary(asoc, peer);
3145 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003146 }
3147
3148 return SCTP_ERROR_NO_ERROR;
3149}
3150
Daniel Borkmann9de79222014-10-09 22:55:31 +02003151/* Verify the ASCONF packet before we process it. */
3152bool sctp_verify_asconf(const struct sctp_association *asoc,
3153 struct sctp_chunk *chunk, bool addr_param_needed,
3154 struct sctp_paramhdr **errp)
3155{
3156 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003157 union sctp_params param;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003158 bool addr_param_seen = false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003159
Daniel Borkmann9de79222014-10-09 22:55:31 +02003160 sctp_walk_params(param, addip, addip_hdr.params) {
3161 size_t length = ntohs(param.p->length);
3162
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003163 *errp = param.p;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003164 switch (param.p->type) {
Daniel Borkmann9de79222014-10-09 22:55:31 +02003165 case SCTP_PARAM_ERR_CAUSE:
3166 break;
3167 case SCTP_PARAM_IPV4_ADDRESS:
3168 if (length != sizeof(sctp_ipv4addr_param_t))
3169 return false;
lucience7b4cc2015-08-27 16:26:34 +08003170 /* ensure there is only one addr param and it's in the
3171 * beginning of addip_hdr params, or we reject it.
3172 */
3173 if (param.v != addip->addip_hdr.params)
3174 return false;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003175 addr_param_seen = true;
3176 break;
3177 case SCTP_PARAM_IPV6_ADDRESS:
3178 if (length != sizeof(sctp_ipv6addr_param_t))
3179 return false;
lucience7b4cc2015-08-27 16:26:34 +08003180 if (param.v != addip->addip_hdr.params)
3181 return false;
Daniel Borkmann9de79222014-10-09 22:55:31 +02003182 addr_param_seen = true;
3183 break;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003184 case SCTP_PARAM_ADD_IP:
3185 case SCTP_PARAM_DEL_IP:
3186 case SCTP_PARAM_SET_PRIMARY:
Daniel Borkmann9de79222014-10-09 22:55:31 +02003187 /* In ASCONF chunks, these need to be first. */
3188 if (addr_param_needed && !addr_param_seen)
3189 return false;
3190 length = ntohs(param.addip->param_hdr.length);
3191 if (length < sizeof(sctp_addip_param_t) +
3192 sizeof(sctp_paramhdr_t))
3193 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003194 break;
3195 case SCTP_PARAM_SUCCESS_REPORT:
3196 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3197 if (length != sizeof(sctp_addip_param_t))
Daniel Borkmann9de79222014-10-09 22:55:31 +02003198 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003199 break;
3200 default:
Daniel Borkmann9de79222014-10-09 22:55:31 +02003201 /* This is unkown to us, reject! */
3202 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003203 }
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003204 }
3205
Daniel Borkmann9de79222014-10-09 22:55:31 +02003206 /* Remaining sanity checks. */
3207 if (addr_param_needed && !addr_param_seen)
3208 return false;
3209 if (!addr_param_needed && addr_param_seen)
3210 return false;
3211 if (param.v != chunk->chunk_end)
3212 return false;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003213
Daniel Borkmann9de79222014-10-09 22:55:31 +02003214 return true;
Wei Yongjun6f4c6182007-09-19 17:19:52 +08003215}
3216
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003217/* Process an incoming ASCONF chunk with the next expected serial no. and
Linus Torvalds1da177e2005-04-16 15:20:36 -07003218 * return an ASCONF_ACK chunk to be sent in response.
3219 */
3220struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3221 struct sctp_chunk *asconf)
3222{
Daniel Borkmann9de79222014-10-09 22:55:31 +02003223 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3224 bool all_param_pass = true;
3225 union sctp_params param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003226 sctp_addiphdr_t *hdr;
3227 union sctp_addr_param *addr_param;
3228 sctp_addip_param_t *asconf_param;
3229 struct sctp_chunk *asconf_ack;
Al Virodbc16db2006-11-20 17:01:42 -08003230 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003231 int length = 0;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003232 int chunk_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 __u32 serial;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003234
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003235 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3237 serial = ntohl(hdr->serial);
3238
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003239 /* Skip the addiphdr and store a pointer to address parameter. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240 length = sizeof(sctp_addiphdr_t);
3241 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3242 chunk_len -= length;
3243
3244 /* Skip the address parameter and store a pointer to the first
Joe Perches7aa1b542007-12-20 14:03:52 -08003245 * asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003246 */
Shan Wei6a435732011-04-18 19:11:47 +00003247 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003248 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 chunk_len -= length;
3250
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003251 /* create an ASCONF_ACK chunk.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003252 * Based on the definitions of parameters, we know that the size of
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003253 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
Joe Perches7aa1b542007-12-20 14:03:52 -08003254 * parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255 */
Wei Yongjun2cab86b2011-03-31 23:42:55 +00003256 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003257 if (!asconf_ack)
3258 goto done;
3259
3260 /* Process the TLVs contained within the ASCONF chunk. */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003261 sctp_walk_params(param, addip, addip_hdr.params) {
3262 /* Skip preceeding address parameters. */
3263 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3264 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3265 continue;
3266
Linus Torvalds1da177e2005-04-16 15:20:36 -07003267 err_code = sctp_process_asconf_param(asoc, asconf,
Daniel Borkmann9de79222014-10-09 22:55:31 +02003268 param.addip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003269 /* ADDIP 4.1 A7)
3270 * If an error response is received for a TLV parameter,
3271 * all TLVs with no response before the failed TLV are
3272 * considered successful if not reported. All TLVs after
3273 * the failed response are considered unsuccessful unless
3274 * a specific success indication is present for the parameter.
3275 */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003276 if (err_code != SCTP_ERROR_NO_ERROR)
3277 all_param_pass = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003278 if (!all_param_pass)
Daniel Borkmann9de79222014-10-09 22:55:31 +02003279 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3280 err_code, param.addip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003281
3282 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3283 * an IP address sends an 'Out of Resource' in its response, it
3284 * MUST also fail any subsequent add or delete requests bundled
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003285 * in the ASCONF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286 */
Daniel Borkmann9de79222014-10-09 22:55:31 +02003287 if (err_code == SCTP_ERROR_RSRC_LOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003288 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290done:
3291 asoc->peer.addip_serial++;
3292
3293 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003294 * after freeing the reference to old asconf ack if any.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003295 */
3296 if (asconf_ack) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003297 sctp_chunk_hold(asconf_ack);
Vlad Yasevicha08de642007-12-20 14:11:47 -08003298 list_add_tail(&asconf_ack->transmitted_list,
3299 &asoc->asconf_ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003300 }
3301
3302 return asconf_ack;
3303}
3304
3305/* Process a asconf parameter that is successfully acked. */
Wei Yongjun425e0f62009-06-16 14:47:30 +08003306static void sctp_asconf_param_success(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307 sctp_addip_param_t *asconf_param)
3308{
3309 struct sctp_af *af;
3310 union sctp_addr addr;
3311 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3312 union sctp_addr_param *addr_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003313 struct sctp_transport *transport;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003314 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003315
Joe Perchesea110732011-06-13 16:21:26 +00003316 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317
3318 /* We have checked the packet before, so we do not check again. */
Shan Wei6a435732011-04-18 19:11:47 +00003319 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
Al Virodd86d132006-11-20 17:11:13 -08003320 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003321
3322 switch (asconf_param->param_hdr.type) {
3323 case SCTP_PARAM_ADD_IP:
Vlad Yasevich559cf712007-09-16 16:03:28 -07003324 /* This is always done in BH context with a socket lock
3325 * held, so the list can not change.
3326 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003327 local_bh_disable();
Vlad Yasevich559cf712007-09-16 16:03:28 -07003328 list_for_each_entry(saddr, &bp->address_list, list) {
Al Virodd86d132006-11-20 17:11:13 -08003329 if (sctp_cmp_addr_exact(&saddr->a, &addr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -08003330 saddr->state = SCTP_ADDR_SRC;
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003331 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003332 local_bh_enable();
Wei Yongjun3cd97492009-06-16 10:07:23 +08003333 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3334 transports) {
Wei Yongjun3cd97492009-06-16 10:07:23 +08003335 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003336 transport->dst = NULL;
Wei Yongjun3cd97492009-06-16 10:07:23 +08003337 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003338 break;
3339 case SCTP_PARAM_DEL_IP:
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003340 local_bh_disable();
Wei Yongjun425e0f62009-06-16 14:47:30 +08003341 sctp_del_bind_addr(bp, &addr);
Michio Honda8a07eb02011-04-26 20:19:36 +09003342 if (asoc->asconf_addr_del_pending != NULL &&
3343 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3344 kfree(asoc->asconf_addr_del_pending);
3345 asoc->asconf_addr_del_pending = NULL;
3346 }
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -04003347 local_bh_enable();
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07003348 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3349 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -07003350 dst_release(transport->dst);
Vlad Yasevichc6ef0062011-04-18 19:15:22 +00003351 transport->dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003352 }
3353 break;
3354 default:
3355 break;
3356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357}
3358
3359/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3360 * for the given asconf parameter. If there is no response for this parameter,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003361 * return the error code based on the third argument 'no_err'.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003362 * ADDIP 4.1
3363 * A7) If an error response is received for a TLV parameter, all TLVs with no
3364 * response before the failed TLV are considered successful if not reported.
3365 * All TLVs after the failed response are considered unsuccessful unless a
3366 * specific success indication is present for the parameter.
3367 */
Al Virodbc16db2006-11-20 17:01:42 -08003368static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003369 sctp_addip_param_t *asconf_param,
3370 int no_err)
3371{
3372 sctp_addip_param_t *asconf_ack_param;
3373 sctp_errhdr_t *err_param;
3374 int length;
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003375 int asconf_ack_len;
Al Virodbc16db2006-11-20 17:01:42 -08003376 __be16 err_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003377
3378 if (no_err)
3379 err_code = SCTP_ERROR_NO_ERROR;
3380 else
3381 err_code = SCTP_ERROR_REQ_REFUSED;
3382
Wei Yongjunf3830cc2007-10-15 11:51:03 +09003383 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3384 sizeof(sctp_chunkhdr_t);
3385
Linus Torvalds1da177e2005-04-16 15:20:36 -07003386 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3387 * the first asconf_ack parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003388 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003389 length = sizeof(sctp_addiphdr_t);
3390 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3391 length);
3392 asconf_ack_len -= length;
3393
3394 while (asconf_ack_len > 0) {
3395 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
wangweidongcb3f8372013-12-23 12:16:50 +08003396 switch (asconf_ack_param->param_hdr.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397 case SCTP_PARAM_SUCCESS_REPORT:
3398 return SCTP_ERROR_NO_ERROR;
3399 case SCTP_PARAM_ERR_CAUSE:
3400 length = sizeof(sctp_addip_param_t);
Joe Perchesea110732011-06-13 16:21:26 +00003401 err_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003402 asconf_ack_len -= length;
3403 if (asconf_ack_len > 0)
3404 return err_param->cause;
3405 else
3406 return SCTP_ERROR_INV_PARAM;
3407 break;
3408 default:
3409 return SCTP_ERROR_INV_PARAM;
3410 }
3411 }
3412
3413 length = ntohs(asconf_ack_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003414 asconf_ack_param = (void *)asconf_ack_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003415 asconf_ack_len -= length;
3416 }
3417
3418 return err_code;
3419}
3420
3421/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3422int sctp_process_asconf_ack(struct sctp_association *asoc,
3423 struct sctp_chunk *asconf_ack)
3424{
3425 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3426 union sctp_addr_param *addr_param;
3427 sctp_addip_param_t *asconf_param;
3428 int length = 0;
3429 int asconf_len = asconf->skb->len;
3430 int all_param_pass = 0;
3431 int no_err = 1;
3432 int retval = 0;
Al Virodbc16db2006-11-20 17:01:42 -08003433 __be16 err_code = SCTP_ERROR_NO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003434
3435 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3436 * a pointer to address parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003437 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003438 length = sizeof(sctp_addip_chunk_t);
3439 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3440 asconf_len -= length;
3441
3442 /* Skip the address parameter in the last asconf sent and store a
Joe Perches7aa1b542007-12-20 14:03:52 -08003443 * pointer to the first asconf parameter.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003444 */
Shan Wei6a435732011-04-18 19:11:47 +00003445 length = ntohs(addr_param->p.length);
Joe Perchesea110732011-06-13 16:21:26 +00003446 asconf_param = (void *)addr_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003447 asconf_len -= length;
3448
3449 /* ADDIP 4.1
3450 * A8) If there is no response(s) to specific TLV parameter(s), and no
3451 * failures are indicated, then all request(s) are considered
3452 * successful.
3453 */
3454 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3455 all_param_pass = 1;
3456
3457 /* Process the TLVs contained in the last sent ASCONF chunk. */
3458 while (asconf_len > 0) {
3459 if (all_param_pass)
3460 err_code = SCTP_ERROR_NO_ERROR;
3461 else {
3462 err_code = sctp_get_asconf_response(asconf_ack,
3463 asconf_param,
3464 no_err);
3465 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3466 no_err = 0;
3467 }
3468
3469 switch (err_code) {
3470 case SCTP_ERROR_NO_ERROR:
Wei Yongjun425e0f62009-06-16 14:47:30 +08003471 sctp_asconf_param_success(asoc, asconf_param);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003472 break;
3473
3474 case SCTP_ERROR_RSRC_LOW:
3475 retval = 1;
3476 break;
3477
Wei Yongjuna987f762009-04-07 15:44:29 +08003478 case SCTP_ERROR_UNKNOWN_PARAM:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479 /* Disable sending this type of asconf parameter in
3480 * future.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003481 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003482 asoc->peer.addip_disabled_mask |=
3483 asconf_param->param_hdr.type;
3484 break;
3485
3486 case SCTP_ERROR_REQ_REFUSED:
3487 case SCTP_ERROR_DEL_LAST_IP:
3488 case SCTP_ERROR_DEL_SRC_IP:
3489 default:
3490 break;
3491 }
3492
3493 /* Skip the processed asconf parameter and move to the next
3494 * one.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003495 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003496 length = ntohs(asconf_param->param_hdr.length);
Joe Perchesea110732011-06-13 16:21:26 +00003497 asconf_param = (void *)asconf_param + length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003498 asconf_len -= length;
3499 }
3500
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003501 if (no_err && asoc->src_out_of_asoc_ok) {
Michio Honda8a07eb02011-04-26 20:19:36 +09003502 asoc->src_out_of_asoc_ok = 0;
Michio Hondaddc4bbe2011-06-17 11:03:23 +09003503 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3504 }
Michio Honda8a07eb02011-04-26 20:19:36 +09003505
Linus Torvalds1da177e2005-04-16 15:20:36 -07003506 /* Free the cached last sent asconf chunk. */
Vlad Yasevich5f9646c2008-02-05 14:23:44 -05003507 list_del_init(&asconf->transmitted_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003508 sctp_chunk_free(asconf);
3509 asoc->addip_last_asconf = NULL;
3510
Linus Torvalds1da177e2005-04-16 15:20:36 -07003511 return retval;
3512}
3513
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003514/* Make a FWD TSN chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003515struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3516 __u32 new_cum_tsn, size_t nstreams,
3517 struct sctp_fwdtsn_skip *skiplist)
3518{
3519 struct sctp_chunk *retval = NULL;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003520 struct sctp_fwdtsn_hdr ftsn_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003521 struct sctp_fwdtsn_skip skip;
3522 size_t hint;
3523 int i;
3524
3525 hint = (nstreams + 1) * sizeof(__u32);
3526
Marcelo Ricardo Leitnercea87682016-03-10 18:33:07 -03003527 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003528
3529 if (!retval)
3530 return NULL;
3531
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3533 retval->subh.fwdtsn_hdr =
3534 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3535
3536 for (i = 0; i < nstreams; i++) {
3537 skip.stream = skiplist[i].stream;
3538 skip.ssn = skiplist[i].ssn;
3539 sctp_addto_chunk(retval, sizeof(skip), &skip);
3540 }
3541
3542 return retval;
3543}