Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 1 | /* SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * (C) Copyright IBM Corp. 2001, 2004 |
| 3 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * Copyright (c) 2001-2002 Intel Corp. |
| 6 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 7 | * This file is part of the SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * These functions work with the state functions in sctp_sm_statefuns.c |
| 10 | * to implement the state operations. These functions implement the |
| 11 | * steps which require modifying existing data structures. |
| 12 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 13 | * This SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * you can redistribute it and/or modify it under the terms of |
| 15 | * the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2, or (at your option) |
| 17 | * any later version. |
| 18 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 19 | * This SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 21 | * ************************ |
| 22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 23 | * See the GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | 4b2f13a | 2013-12-06 06:28:48 -0800 | [diff] [blame] | 26 | * along with GNU CC; see the file COPYING. If not, see |
| 27 | * <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * |
| 29 | * Please send any bug reports or fixes you make to the |
| 30 | * email address(es): |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | */ |
| 45 | |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/types.h> |
| 49 | #include <linux/kernel.h> |
| 50 | #include <linux/ip.h> |
| 51 | #include <linux/ipv6.h> |
| 52 | #include <linux/net.h> |
| 53 | #include <linux/inet.h> |
Christian Borntraeger | ebc3bbc | 2007-10-23 12:46:32 +0200 | [diff] [blame] | 54 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <linux/crypto.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 56 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #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 Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 64 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
| 65 | __u8 type, __u8 flags, int paylen); |
| 66 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
| 67 | __u8 flags, int paylen); |
| 68 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
| 69 | __u8 type, __u8 flags, int paylen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
| 71 | const struct sctp_association *asoc, |
| 72 | const struct sctp_chunk *init_chunk, |
| 73 | int *cookie_len, |
| 74 | const __u8 *raw_addrs, int addrs_len); |
| 75 | static int sctp_process_param(struct sctp_association *asoc, |
| 76 | union sctp_params param, |
| 77 | const union sctp_addr *peer_addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 78 | gfp_t gfp); |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 79 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
| 80 | const void *data); |
stephen hemminger | 6daaf0d | 2014-01-09 22:31:11 -0800 | [diff] [blame] | 81 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, |
| 82 | const void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 84 | /* Control chunk destructor */ |
| 85 | static void sctp_control_release_owner(struct sk_buff *skb) |
| 86 | { |
| 87 | /*TODO: do memory release */ |
| 88 | } |
| 89 | |
| 90 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) |
| 91 | { |
| 92 | struct sctp_association *asoc = chunk->asoc; |
| 93 | struct sk_buff *skb = chunk->skb; |
| 94 | |
| 95 | /* TODO: properly account for control chunks. |
| 96 | * To do it right we'll need: |
| 97 | * 1) endpoint if association isn't known. |
| 98 | * 2) proper memory accounting. |
| 99 | * |
| 100 | * For now don't do anything for now. |
| 101 | */ |
| 102 | skb->sk = asoc ? asoc->base.sk : NULL; |
| 103 | skb->destructor = sctp_control_release_owner; |
| 104 | } |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | /* What was the inbound interface for this chunk? */ |
| 107 | int sctp_chunk_iif(const struct sctp_chunk *chunk) |
| 108 | { |
| 109 | struct sctp_af *af; |
| 110 | int iif = 0; |
| 111 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 112 | af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | if (af) |
| 114 | iif = af->skb_iif(chunk->skb); |
| 115 | |
| 116 | return iif; |
| 117 | } |
| 118 | |
| 119 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
| 120 | * |
| 121 | * Note 2: The ECN capable field is reserved for future use of |
| 122 | * Explicit Congestion Notification. |
| 123 | */ |
| 124 | static const struct sctp_paramhdr ecap_param = { |
| 125 | SCTP_PARAM_ECN_CAPABLE, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 126 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | }; |
| 128 | static const struct sctp_paramhdr prsctp_param = { |
| 129 | SCTP_PARAM_FWD_TSN_SUPPORT, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 130 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | }; |
| 132 | |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 133 | /* A helper to initialize an op error inside a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | * provided chunk, as most cause codes will be embedded inside an |
| 135 | * abort chunk. |
| 136 | */ |
Al Viro | 5bf2db0 | 2006-11-20 16:59:45 -0800 | [diff] [blame] | 137 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 138 | size_t paylen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | { |
| 140 | sctp_errhdr_t err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | __u16 len; |
| 142 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 143 | /* Cause code constants are now defined in network order. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | err.cause = cause_code; |
| 145 | len = sizeof(sctp_errhdr_t) + paylen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | err.length = htons(len); |
Vlad Yasevich | 4a1c010 | 2007-01-09 14:35:51 -0800 | [diff] [blame] | 147 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 150 | /* A helper to initialize an op error inside a |
| 151 | * provided chunk, as most cause codes will be embedded inside an |
| 152 | * abort chunk. Differs from sctp_init_cause in that it won't oops |
| 153 | * if there isn't enough space in the op error chunk |
| 154 | */ |
Ioan Orghici | db28aaf | 2012-07-13 07:16:37 +0000 | [diff] [blame] | 155 | static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 156 | size_t paylen) |
| 157 | { |
| 158 | sctp_errhdr_t err; |
| 159 | __u16 len; |
| 160 | |
| 161 | /* Cause code constants are now defined in network order. */ |
| 162 | err.cause = cause_code; |
| 163 | len = sizeof(sctp_errhdr_t) + paylen; |
| 164 | err.length = htons(len); |
| 165 | |
Wei Yongjun | 2e3219b | 2010-05-17 22:51:58 -0700 | [diff] [blame] | 166 | if (skb_tailroom(chunk->skb) < len) |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 167 | return -ENOSPC; |
| 168 | chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, |
| 169 | sizeof(sctp_errhdr_t), |
| 170 | &err); |
| 171 | return 0; |
| 172 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /* 3.3.2 Initiation (INIT) (1) |
| 174 | * |
| 175 | * This chunk is used to initiate a SCTP association between two |
| 176 | * endpoints. The format of the INIT chunk is shown below: |
| 177 | * |
| 178 | * 0 1 2 3 |
| 179 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| 180 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 181 | * | Type = 1 | Chunk Flags | Chunk Length | |
| 182 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 183 | * | Initiate Tag | |
| 184 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 185 | * | Advertised Receiver Window Credit (a_rwnd) | |
| 186 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 187 | * | Number of Outbound Streams | Number of Inbound Streams | |
| 188 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 189 | * | Initial TSN | |
| 190 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 191 | * \ \ |
| 192 | * / Optional/Variable-Length Parameters / |
| 193 | * \ \ |
| 194 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 195 | * |
| 196 | * |
| 197 | * The INIT chunk contains the following parameters. Unless otherwise |
| 198 | * noted, each parameter MUST only be included once in the INIT chunk. |
| 199 | * |
| 200 | * Fixed Parameters Status |
| 201 | * ---------------------------------------------- |
| 202 | * Initiate Tag Mandatory |
| 203 | * Advertised Receiver Window Credit Mandatory |
| 204 | * Number of Outbound Streams Mandatory |
| 205 | * Number of Inbound Streams Mandatory |
| 206 | * Initial TSN Mandatory |
| 207 | * |
| 208 | * Variable Parameters Status Type Value |
| 209 | * ------------------------------------------------------------- |
| 210 | * IPv4 Address (Note 1) Optional 5 |
| 211 | * IPv6 Address (Note 1) Optional 6 |
| 212 | * Cookie Preservative Optional 9 |
| 213 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) |
| 214 | * Host Name Address (Note 3) Optional 11 |
| 215 | * Supported Address Types (Note 4) Optional 12 |
| 216 | */ |
| 217 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, |
| 218 | const struct sctp_bind_addr *bp, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 219 | gfp_t gfp, int vparam_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 221 | struct net *net = sock_net(asoc->base.sk); |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 222 | struct sctp_endpoint *ep = asoc->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | sctp_inithdr_t init; |
| 224 | union sctp_params addrs; |
| 225 | size_t chunksize; |
| 226 | struct sctp_chunk *retval = NULL; |
| 227 | int num_types, addrs_len = 0; |
| 228 | struct sctp_sock *sp; |
| 229 | sctp_supported_addrs_param_t sat; |
Al Viro | 3dbe865 | 2006-11-20 17:25:49 -0800 | [diff] [blame] | 230 | __be16 types[2]; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 231 | sctp_adaptation_ind_param_t aiparam; |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 232 | sctp_supported_ext_param_t ext_param; |
| 233 | int num_ext = 0; |
| 234 | __u8 extensions[3]; |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 235 | sctp_paramhdr_t *auth_chunks = NULL, |
| 236 | *auth_hmacs = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
| 239 | * |
| 240 | * Note 1: The INIT chunks can contain multiple addresses that |
| 241 | * can be IPv4 and/or IPv6 in any combination. |
| 242 | */ |
| 243 | retval = NULL; |
| 244 | |
| 245 | /* Convert the provided bind address list to raw format. */ |
| 246 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); |
| 247 | |
| 248 | init.init_tag = htonl(asoc->c.my_vtag); |
| 249 | init.a_rwnd = htonl(asoc->rwnd); |
| 250 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); |
| 251 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); |
| 252 | init.initial_tsn = htonl(asoc->c.initial_tsn); |
| 253 | |
| 254 | /* How many address types are needed? */ |
| 255 | sp = sctp_sk(asoc->base.sk); |
| 256 | num_types = sp->pf->supported_addrs(sp, types); |
| 257 | |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 258 | chunksize = sizeof(init) + addrs_len; |
| 259 | chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | chunksize += sizeof(ecap_param); |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 261 | |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 262 | if (net->sctp.prsctp_enable) |
Vlad Yasevich | 036b579 | 2008-01-07 00:28:16 -0800 | [diff] [blame] | 263 | chunksize += sizeof(prsctp_param); |
| 264 | |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 265 | /* ADDIP: Section 4.2.7: |
| 266 | * An implementation supporting this extension [ADDIP] MUST list |
| 267 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and |
| 268 | * INIT-ACK parameters. |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 269 | */ |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 270 | if (net->sctp.addip_enable) { |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 271 | extensions[num_ext] = SCTP_CID_ASCONF; |
| 272 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; |
| 273 | num_ext += 2; |
| 274 | } |
| 275 | |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 276 | if (sp->adaptation_ind) |
| 277 | chunksize += sizeof(aiparam); |
| 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | chunksize += vparam_len; |
| 280 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 281 | /* Account for AUTH related parameters */ |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 282 | if (ep->auth_enable) { |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 283 | /* Add random parameter length*/ |
| 284 | chunksize += sizeof(asoc->c.auth_random); |
| 285 | |
| 286 | /* Add HMACS parameter length if any were defined */ |
| 287 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; |
| 288 | if (auth_hmacs->length) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 289 | chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 290 | else |
| 291 | auth_hmacs = NULL; |
| 292 | |
| 293 | /* Add CHUNKS parameter length */ |
| 294 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; |
| 295 | if (auth_chunks->length) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 296 | chunksize += WORD_ROUND(ntohs(auth_chunks->length)); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 297 | else |
Vlad Yasevich | 9baffaa | 2007-11-29 08:44:34 -0500 | [diff] [blame] | 298 | auth_chunks = NULL; |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 299 | |
| 300 | extensions[num_ext] = SCTP_CID_AUTH; |
| 301 | num_ext += 1; |
| 302 | } |
| 303 | |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 304 | /* If we have any extensions to report, account for that */ |
| 305 | if (num_ext) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 306 | chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + |
| 307 | num_ext); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
| 310 | * |
| 311 | * Note 3: An INIT chunk MUST NOT contain more than one Host |
| 312 | * Name address parameter. Moreover, the sender of the INIT |
| 313 | * MUST NOT combine any other address types with the Host Name |
| 314 | * address in the INIT. The receiver of INIT MUST ignore any |
| 315 | * other address types if the Host Name address parameter is |
| 316 | * present in the received INIT chunk. |
| 317 | * |
| 318 | * PLEASE DO NOT FIXME [This version does not support Host Name.] |
| 319 | */ |
| 320 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 321 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (!retval) |
| 323 | goto nodata; |
| 324 | |
| 325 | retval->subh.init_hdr = |
| 326 | sctp_addto_chunk(retval, sizeof(init), &init); |
| 327 | retval->param_hdr.v = |
| 328 | sctp_addto_chunk(retval, addrs_len, addrs.v); |
| 329 | |
| 330 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
| 331 | * |
| 332 | * Note 4: This parameter, when present, specifies all the |
| 333 | * address types the sending endpoint can support. The absence |
| 334 | * of this parameter indicates that the sending endpoint can |
| 335 | * support any address type. |
| 336 | */ |
| 337 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; |
| 338 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); |
| 339 | sctp_addto_chunk(retval, sizeof(sat), &sat); |
| 340 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); |
| 341 | |
| 342 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 343 | |
Joe Perches | 7aa1b54 | 2007-12-20 14:03:52 -0800 | [diff] [blame] | 344 | /* Add the supported extensions parameter. Be nice and add this |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 345 | * fist before addiding the parameters for the extensions themselves |
| 346 | */ |
| 347 | if (num_ext) { |
| 348 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; |
| 349 | ext_param.param_hdr.length = |
| 350 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); |
| 351 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), |
| 352 | &ext_param); |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 353 | sctp_addto_param(retval, num_ext, extensions); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 354 | } |
| 355 | |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 356 | if (net->sctp.prsctp_enable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 358 | |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 359 | if (sp->adaptation_ind) { |
| 360 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; |
| 361 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
| 362 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); |
| 363 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
| 364 | } |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 365 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 366 | /* Add SCTP-AUTH chunks to the parameter list */ |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 367 | if (ep->auth_enable) { |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 368 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
| 369 | asoc->c.auth_random); |
| 370 | if (auth_hmacs) |
| 371 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), |
| 372 | auth_hmacs); |
| 373 | if (auth_chunks) |
| 374 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), |
| 375 | auth_chunks); |
| 376 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | nodata: |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 378 | kfree(addrs.v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return retval; |
| 380 | } |
| 381 | |
| 382 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, |
| 383 | const struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 384 | gfp_t gfp, int unkparam_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | { |
| 386 | sctp_inithdr_t initack; |
| 387 | struct sctp_chunk *retval; |
| 388 | union sctp_params addrs; |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 389 | struct sctp_sock *sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | int addrs_len; |
| 391 | sctp_cookie_param_t *cookie; |
| 392 | int cookie_len; |
| 393 | size_t chunksize; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 394 | sctp_adaptation_ind_param_t aiparam; |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 395 | sctp_supported_ext_param_t ext_param; |
| 396 | int num_ext = 0; |
| 397 | __u8 extensions[3]; |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 398 | sctp_paramhdr_t *auth_chunks = NULL, |
| 399 | *auth_hmacs = NULL, |
| 400 | *auth_random = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | retval = NULL; |
| 403 | |
| 404 | /* Note: there may be no addresses to embed. */ |
| 405 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); |
| 406 | |
| 407 | initack.init_tag = htonl(asoc->c.my_vtag); |
| 408 | initack.a_rwnd = htonl(asoc->rwnd); |
| 409 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); |
| 410 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); |
| 411 | initack.initial_tsn = htonl(asoc->c.initial_tsn); |
| 412 | |
| 413 | /* FIXME: We really ought to build the cookie right |
| 414 | * into the packet instead of allocating more fresh memory. |
| 415 | */ |
| 416 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, |
| 417 | addrs.v, addrs_len); |
| 418 | if (!cookie) |
| 419 | goto nomem_cookie; |
| 420 | |
| 421 | /* Calculate the total size of allocation, include the reserved |
| 422 | * space for reporting unknown parameters if it is specified. |
| 423 | */ |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 424 | sp = sctp_sk(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
| 426 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 427 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (asoc->peer.ecn_capable) |
| 429 | chunksize += sizeof(ecap_param); |
| 430 | |
Wei Yongjun | 5ffad5a | 2009-03-12 09:49:18 +0000 | [diff] [blame] | 431 | if (asoc->peer.prsctp_capable) |
Vlad Yasevich | 036b579 | 2008-01-07 00:28:16 -0800 | [diff] [blame] | 432 | chunksize += sizeof(prsctp_param); |
| 433 | |
Wei Yongjun | 5ffad5a | 2009-03-12 09:49:18 +0000 | [diff] [blame] | 434 | if (asoc->peer.asconf_capable) { |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 435 | extensions[num_ext] = SCTP_CID_ASCONF; |
| 436 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; |
| 437 | num_ext += 2; |
| 438 | } |
| 439 | |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 440 | if (sp->adaptation_ind) |
| 441 | chunksize += sizeof(aiparam); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 443 | if (asoc->peer.auth_capable) { |
| 444 | auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; |
| 445 | chunksize += ntohs(auth_random->length); |
| 446 | |
| 447 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; |
| 448 | if (auth_hmacs->length) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 449 | chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 450 | else |
| 451 | auth_hmacs = NULL; |
| 452 | |
| 453 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; |
| 454 | if (auth_chunks->length) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 455 | chunksize += WORD_ROUND(ntohs(auth_chunks->length)); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 456 | else |
| 457 | auth_chunks = NULL; |
| 458 | |
| 459 | extensions[num_ext] = SCTP_CID_AUTH; |
| 460 | num_ext += 1; |
| 461 | } |
| 462 | |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 463 | if (num_ext) |
Wei Yongjun | a8170c3 | 2010-04-28 08:47:21 +0000 | [diff] [blame] | 464 | chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + |
| 465 | num_ext); |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | /* Now allocate and fill out the chunk. */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 468 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | if (!retval) |
| 470 | goto nomem_chunk; |
| 471 | |
Dan Carpenter | b99a4d5 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 472 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 473 | * |
| 474 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 475 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 476 | * address from which it received the DATA or control chunk |
| 477 | * to which it is replying. |
| 478 | * |
| 479 | * [INIT ACK back to where the INIT came from.] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | */ |
| 481 | retval->transport = chunk->transport; |
Dan Carpenter | b99a4d5 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | retval->subh.init_hdr = |
| 484 | sctp_addto_chunk(retval, sizeof(initack), &initack); |
| 485 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); |
| 486 | sctp_addto_chunk(retval, cookie_len, cookie); |
| 487 | if (asoc->peer.ecn_capable) |
| 488 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 489 | if (num_ext) { |
| 490 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; |
| 491 | ext_param.param_hdr.length = |
| 492 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); |
| 493 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), |
| 494 | &ext_param); |
Vlad Yasevich | 8ee4be3 | 2007-11-29 08:50:35 -0500 | [diff] [blame] | 495 | sctp_addto_param(retval, num_ext, extensions); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | if (asoc->peer.prsctp_capable) |
| 498 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
| 499 | |
malc | 6fc791e | 2009-03-12 09:49:20 +0000 | [diff] [blame] | 500 | if (sp->adaptation_ind) { |
| 501 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; |
| 502 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
| 503 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); |
| 504 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
| 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 507 | if (asoc->peer.auth_capable) { |
| 508 | sctp_addto_chunk(retval, ntohs(auth_random->length), |
| 509 | auth_random); |
| 510 | if (auth_hmacs) |
| 511 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), |
| 512 | auth_hmacs); |
| 513 | if (auth_chunks) |
| 514 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), |
| 515 | auth_chunks); |
| 516 | } |
| 517 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* We need to remove the const qualifier at this point. */ |
| 519 | retval->asoc = (struct sctp_association *) asoc; |
| 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | nomem_chunk: |
| 522 | kfree(cookie); |
| 523 | nomem_cookie: |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 524 | kfree(addrs.v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | return retval; |
| 526 | } |
| 527 | |
| 528 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): |
| 529 | * |
| 530 | * This chunk is used only during the initialization of an association. |
| 531 | * It is sent by the initiator of an association to its peer to complete |
| 532 | * the initialization process. This chunk MUST precede any DATA chunk |
| 533 | * sent within the association, but MAY be bundled with one or more DATA |
| 534 | * chunks in the same packet. |
| 535 | * |
| 536 | * 0 1 2 3 |
| 537 | * 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 |
| 538 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 539 | * | Type = 10 |Chunk Flags | Length | |
| 540 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 541 | * / Cookie / |
| 542 | * \ \ |
| 543 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 544 | * |
| 545 | * Chunk Flags: 8 bit |
| 546 | * |
| 547 | * Set to zero on transmit and ignored on receipt. |
| 548 | * |
| 549 | * Length: 16 bits (unsigned integer) |
| 550 | * |
| 551 | * Set to the size of the chunk in bytes, including the 4 bytes of |
| 552 | * the chunk header and the size of the Cookie. |
| 553 | * |
| 554 | * Cookie: variable size |
| 555 | * |
| 556 | * This field must contain the exact cookie received in the |
| 557 | * State Cookie parameter from the previous INIT ACK. |
| 558 | * |
| 559 | * An implementation SHOULD make the cookie as small as possible |
| 560 | * to insure interoperability. |
| 561 | */ |
| 562 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, |
| 563 | const struct sctp_chunk *chunk) |
| 564 | { |
| 565 | struct sctp_chunk *retval; |
| 566 | void *cookie; |
| 567 | int cookie_len; |
| 568 | |
| 569 | cookie = asoc->peer.cookie; |
| 570 | cookie_len = asoc->peer.cookie_len; |
| 571 | |
| 572 | /* Build a cookie echo chunk. */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 573 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | if (!retval) |
| 575 | goto nodata; |
| 576 | retval->subh.cookie_hdr = |
| 577 | sctp_addto_chunk(retval, cookie_len, cookie); |
| 578 | |
| 579 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 580 | * |
| 581 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 582 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 583 | * address from which it * received the DATA or control chunk |
| 584 | * to which it is replying. |
| 585 | * |
| 586 | * [COOKIE ECHO back to where the INIT ACK came from.] |
| 587 | */ |
| 588 | if (chunk) |
| 589 | retval->transport = chunk->transport; |
| 590 | |
| 591 | nodata: |
| 592 | return retval; |
| 593 | } |
| 594 | |
| 595 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): |
| 596 | * |
| 597 | * This chunk is used only during the initialization of an |
| 598 | * association. It is used to acknowledge the receipt of a COOKIE |
| 599 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent |
| 600 | * within the association, but MAY be bundled with one or more DATA |
| 601 | * chunks or SACK chunk in the same SCTP packet. |
| 602 | * |
| 603 | * 0 1 2 3 |
| 604 | * 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 |
| 605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 606 | * | Type = 11 |Chunk Flags | Length = 4 | |
| 607 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 608 | * |
| 609 | * Chunk Flags: 8 bits |
| 610 | * |
| 611 | * Set to zero on transmit and ignored on receipt. |
| 612 | */ |
| 613 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, |
| 614 | const struct sctp_chunk *chunk) |
| 615 | { |
| 616 | struct sctp_chunk *retval; |
| 617 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 618 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
| 620 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 621 | * |
| 622 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 623 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 624 | * address from which it * received the DATA or control chunk |
| 625 | * to which it is replying. |
| 626 | * |
| 627 | * [COOKIE ACK back to where the COOKIE ECHO came from.] |
| 628 | */ |
| 629 | if (retval && chunk) |
| 630 | retval->transport = chunk->transport; |
| 631 | |
| 632 | return retval; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Appendix A: Explicit Congestion Notification: |
| 637 | * CWR: |
| 638 | * |
| 639 | * RFC 2481 details a specific bit for a sender to send in the header of |
| 640 | * its next outbound TCP segment to indicate to its peer that it has |
| 641 | * reduced its congestion window. This is termed the CWR bit. For |
| 642 | * SCTP the same indication is made by including the CWR chunk. |
| 643 | * This chunk contains one data element, i.e. the TSN number that |
| 644 | * was sent in the ECNE chunk. This element represents the lowest |
| 645 | * TSN number in the datagram that was originally marked with the |
| 646 | * CE bit. |
| 647 | * |
| 648 | * 0 1 2 3 |
| 649 | * 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 |
| 650 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 651 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | |
| 652 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 653 | * | Lowest TSN Number | |
| 654 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 655 | * |
| 656 | * Note: The CWR is considered a Control chunk. |
| 657 | */ |
| 658 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, |
| 659 | const __u32 lowest_tsn, |
| 660 | const struct sctp_chunk *chunk) |
| 661 | { |
| 662 | struct sctp_chunk *retval; |
| 663 | sctp_cwrhdr_t cwr; |
| 664 | |
| 665 | cwr.lowest_tsn = htonl(lowest_tsn); |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 666 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
| 667 | sizeof(sctp_cwrhdr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | if (!retval) |
| 670 | goto nodata; |
| 671 | |
| 672 | retval->subh.ecn_cwr_hdr = |
| 673 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); |
| 674 | |
| 675 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 676 | * |
| 677 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 678 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 679 | * address from which it * received the DATA or control chunk |
| 680 | * to which it is replying. |
| 681 | * |
| 682 | * [Report a reduced congestion window back to where the ECNE |
| 683 | * came from.] |
| 684 | */ |
| 685 | if (chunk) |
| 686 | retval->transport = chunk->transport; |
| 687 | |
| 688 | nodata: |
| 689 | return retval; |
| 690 | } |
| 691 | |
| 692 | /* Make an ECNE chunk. This is a congestion experienced report. */ |
| 693 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, |
| 694 | const __u32 lowest_tsn) |
| 695 | { |
| 696 | struct sctp_chunk *retval; |
| 697 | sctp_ecnehdr_t ecne; |
| 698 | |
| 699 | ecne.lowest_tsn = htonl(lowest_tsn); |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 700 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
| 701 | sizeof(sctp_ecnehdr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if (!retval) |
| 703 | goto nodata; |
| 704 | retval->subh.ecne_hdr = |
| 705 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); |
| 706 | |
| 707 | nodata: |
| 708 | return retval; |
| 709 | } |
| 710 | |
| 711 | /* Make a DATA chunk for the given association from the provided |
| 712 | * parameters. However, do not populate the data payload. |
| 713 | */ |
| 714 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, |
| 715 | const struct sctp_sndrcvinfo *sinfo, |
| 716 | int data_len, __u8 flags, __u16 ssn) |
| 717 | { |
| 718 | struct sctp_chunk *retval; |
| 719 | struct sctp_datahdr dp; |
| 720 | int chunk_len; |
| 721 | |
| 722 | /* We assign the TSN as LATE as possible, not here when |
| 723 | * creating the chunk. |
| 724 | */ |
| 725 | dp.tsn = 0; |
| 726 | dp.stream = htons(sinfo->sinfo_stream); |
| 727 | dp.ppid = sinfo->sinfo_ppid; |
| 728 | |
| 729 | /* Set the flags for an unordered send. */ |
Ivan Skytte Jorgensen | eaa5c54 | 2005-10-28 15:10:00 -0700 | [diff] [blame] | 730 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | flags |= SCTP_DATA_UNORDERED; |
| 732 | dp.ssn = 0; |
| 733 | } else |
| 734 | dp.ssn = htons(ssn); |
| 735 | |
| 736 | chunk_len = sizeof(dp) + data_len; |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 737 | retval = sctp_make_data(asoc, flags, chunk_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | if (!retval) |
| 739 | goto nodata; |
| 740 | |
| 741 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); |
| 742 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); |
| 743 | |
| 744 | nodata: |
| 745 | return retval; |
| 746 | } |
| 747 | |
| 748 | /* Create a selective ackowledgement (SACK) for the given |
| 749 | * association. This reports on which TSN's we've seen to date, |
| 750 | * including duplicates and gaps. |
| 751 | */ |
| 752 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) |
| 753 | { |
| 754 | struct sctp_chunk *retval; |
| 755 | struct sctp_sackhdr sack; |
| 756 | int len; |
| 757 | __u32 ctsn; |
| 758 | __u16 num_gabs, num_dup_tsns; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 759 | struct sctp_association *aptr = (struct sctp_association *)asoc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
Vlad Yasevich | 0201518 | 2008-10-08 14:19:01 -0700 | [diff] [blame] | 761 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 762 | struct sctp_transport *trans; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Vlad Yasevich | 0201518 | 2008-10-08 14:19:01 -0700 | [diff] [blame] | 764 | memset(gabs, 0, sizeof(gabs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | ctsn = sctp_tsnmap_get_ctsn(map); |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 766 | |
| 767 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | /* How much room is needed in the chunk? */ |
Vlad Yasevich | 0201518 | 2008-10-08 14:19:01 -0700 | [diff] [blame] | 770 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
| 772 | |
| 773 | /* Initialize the SACK header. */ |
| 774 | sack.cum_tsn_ack = htonl(ctsn); |
| 775 | sack.a_rwnd = htonl(asoc->a_rwnd); |
| 776 | sack.num_gap_ack_blocks = htons(num_gabs); |
| 777 | sack.num_dup_tsns = htons(num_dup_tsns); |
| 778 | |
| 779 | len = sizeof(sack) |
| 780 | + sizeof(struct sctp_gap_ack_block) * num_gabs |
| 781 | + sizeof(__u32) * num_dup_tsns; |
| 782 | |
| 783 | /* Create the chunk. */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 784 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | if (!retval) |
| 786 | goto nodata; |
| 787 | |
| 788 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 789 | * |
| 790 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 791 | * HEARTBEAT ACK, etc.) to the same destination transport |
| 792 | * address from which it received the DATA or control chunk to |
| 793 | * which it is replying. This rule should also be followed if |
| 794 | * the endpoint is bundling DATA chunks together with the |
| 795 | * reply chunk. |
| 796 | * |
| 797 | * However, when acknowledging multiple DATA chunks received |
| 798 | * in packets from different source addresses in a single |
| 799 | * SACK, the SACK chunk may be transmitted to one of the |
| 800 | * destination transport addresses from which the DATA or |
| 801 | * control chunks being acknowledged were received. |
| 802 | * |
| 803 | * [BUG: We do not implement the following paragraph. |
| 804 | * Perhaps we should remember the last transport we used for a |
| 805 | * SACK and avoid that (if possible) if we have seen any |
| 806 | * duplicates. --piggy] |
| 807 | * |
| 808 | * When a receiver of a duplicate DATA chunk sends a SACK to a |
| 809 | * multi- homed endpoint it MAY be beneficial to vary the |
| 810 | * destination address and not use the source address of the |
| 811 | * DATA chunk. The reason being that receiving a duplicate |
| 812 | * from a multi-homed endpoint might indicate that the return |
| 813 | * path (as specified in the source address of the DATA chunk) |
| 814 | * for the SACK is broken. |
| 815 | * |
| 816 | * [Send to the address from which we last received a DATA chunk.] |
| 817 | */ |
| 818 | retval->transport = asoc->peer.last_data_from; |
| 819 | |
| 820 | retval->subh.sack_hdr = |
| 821 | sctp_addto_chunk(retval, sizeof(sack), &sack); |
| 822 | |
| 823 | /* Add the gap ack block information. */ |
| 824 | if (num_gabs) |
| 825 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, |
Vlad Yasevich | 0201518 | 2008-10-08 14:19:01 -0700 | [diff] [blame] | 826 | gabs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | /* Add the duplicate TSN information. */ |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 829 | if (num_dup_tsns) { |
| 830 | aptr->stats.idupchunks += num_dup_tsns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
| 832 | sctp_tsnmap_get_dups(map)); |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 833 | } |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 834 | /* Once we have a sack generated, check to see what our sack |
| 835 | * generation is, if its 0, reset the transports to 0, and reset |
| 836 | * the association generation to 1 |
| 837 | * |
| 838 | * The idea is that zero is never used as a valid generation for the |
| 839 | * association so no transport will match after a wrap event like this, |
| 840 | * Until the next sack |
| 841 | */ |
| 842 | if (++aptr->peer.sack_generation == 0) { |
| 843 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
| 844 | transports) |
| 845 | trans->sack_generation = 0; |
| 846 | aptr->peer.sack_generation = 1; |
| 847 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | nodata: |
| 849 | return retval; |
| 850 | } |
| 851 | |
| 852 | /* Make a SHUTDOWN chunk. */ |
| 853 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, |
| 854 | const struct sctp_chunk *chunk) |
| 855 | { |
| 856 | struct sctp_chunk *retval; |
| 857 | sctp_shutdownhdr_t shut; |
| 858 | __u32 ctsn; |
| 859 | |
| 860 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| 861 | shut.cum_tsn_ack = htonl(ctsn); |
| 862 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 863 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
| 864 | sizeof(sctp_shutdownhdr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | if (!retval) |
| 866 | goto nodata; |
| 867 | |
| 868 | retval->subh.shutdown_hdr = |
| 869 | sctp_addto_chunk(retval, sizeof(shut), &shut); |
| 870 | |
| 871 | if (chunk) |
| 872 | retval->transport = chunk->transport; |
| 873 | nodata: |
| 874 | return retval; |
| 875 | } |
| 876 | |
| 877 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, |
| 878 | const struct sctp_chunk *chunk) |
| 879 | { |
| 880 | struct sctp_chunk *retval; |
| 881 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 882 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
| 884 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 885 | * |
| 886 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 887 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 888 | * address from which it * received the DATA or control chunk |
| 889 | * to which it is replying. |
| 890 | * |
| 891 | * [ACK back to where the SHUTDOWN came from.] |
| 892 | */ |
| 893 | if (retval && chunk) |
| 894 | retval->transport = chunk->transport; |
| 895 | |
| 896 | return retval; |
| 897 | } |
| 898 | |
| 899 | struct sctp_chunk *sctp_make_shutdown_complete( |
| 900 | const struct sctp_association *asoc, |
| 901 | const struct sctp_chunk *chunk) |
| 902 | { |
| 903 | struct sctp_chunk *retval; |
| 904 | __u8 flags = 0; |
| 905 | |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 906 | /* Set the T-bit if we have no association (vtag will be |
| 907 | * reflected) |
| 908 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
| 910 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 911 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 914 | * |
| 915 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 916 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 917 | * address from which it * received the DATA or control chunk |
| 918 | * to which it is replying. |
| 919 | * |
| 920 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK |
| 921 | * came from.] |
| 922 | */ |
| 923 | if (retval && chunk) |
| 924 | retval->transport = chunk->transport; |
| 925 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 926 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | /* Create an ABORT. Note that we set the T bit if we have no |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 930 | * association, except when responding to an INIT (sctpimpguide 2.41). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | */ |
| 932 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, |
| 933 | const struct sctp_chunk *chunk, |
| 934 | const size_t hint) |
| 935 | { |
| 936 | struct sctp_chunk *retval; |
| 937 | __u8 flags = 0; |
| 938 | |
Jerome Forissier | 047a242 | 2005-04-28 11:58:43 -0700 | [diff] [blame] | 939 | /* Set the T-bit if we have no association and 'chunk' is not |
| 940 | * an INIT (vtag will be reflected). |
| 941 | */ |
| 942 | if (!asoc) { |
| 943 | if (chunk && chunk->chunk_hdr && |
| 944 | chunk->chunk_hdr->type == SCTP_CID_INIT) |
| 945 | flags = 0; |
| 946 | else |
| 947 | flags = SCTP_CHUNK_FLAG_T; |
| 948 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 950 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
| 952 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 953 | * |
| 954 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 955 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 956 | * address from which it * received the DATA or control chunk |
| 957 | * to which it is replying. |
| 958 | * |
| 959 | * [ABORT back to where the offender came from.] |
| 960 | */ |
| 961 | if (retval && chunk) |
| 962 | retval->transport = chunk->transport; |
| 963 | |
| 964 | return retval; |
| 965 | } |
| 966 | |
| 967 | /* Helper to create ABORT with a NO_USER_DATA error. */ |
| 968 | struct sctp_chunk *sctp_make_abort_no_data( |
| 969 | const struct sctp_association *asoc, |
| 970 | const struct sctp_chunk *chunk, __u32 tsn) |
| 971 | { |
| 972 | struct sctp_chunk *retval; |
Al Viro | 9f81bcd | 2006-11-20 17:26:34 -0800 | [diff] [blame] | 973 | __be32 payload; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
| 975 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) |
| 976 | + sizeof(tsn)); |
| 977 | |
| 978 | if (!retval) |
| 979 | goto no_mem; |
| 980 | |
| 981 | /* Put the tsn back into network byte order. */ |
| 982 | payload = htonl(tsn); |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 983 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
| 984 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
| 986 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 987 | * |
| 988 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 989 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 990 | * address from which it * received the DATA or control chunk |
| 991 | * to which it is replying. |
| 992 | * |
| 993 | * [ABORT back to where the offender came from.] |
| 994 | */ |
| 995 | if (chunk) |
| 996 | retval->transport = chunk->transport; |
| 997 | |
| 998 | no_mem: |
| 999 | return retval; |
| 1000 | } |
| 1001 | |
| 1002 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ |
| 1003 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, |
Sridhar Samudrala | c164a9b | 2006-08-22 11:50:39 -0700 | [diff] [blame] | 1004 | const struct msghdr *msg, |
| 1005 | size_t paylen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | { |
| 1007 | struct sctp_chunk *retval; |
Sridhar Samudrala | c164a9b | 2006-08-22 11:50:39 -0700 | [diff] [blame] | 1008 | void *payload = NULL; |
| 1009 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
Sridhar Samudrala | c164a9b | 2006-08-22 11:50:39 -0700 | [diff] [blame] | 1011 | retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | if (!retval) |
| 1013 | goto err_chunk; |
| 1014 | |
| 1015 | if (paylen) { |
| 1016 | /* Put the msg_iov together into payload. */ |
Sridhar Samudrala | c164a9b | 2006-08-22 11:50:39 -0700 | [diff] [blame] | 1017 | payload = kmalloc(paylen, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | if (!payload) |
| 1019 | goto err_payload; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Sridhar Samudrala | c164a9b | 2006-08-22 11:50:39 -0700 | [diff] [blame] | 1021 | err = memcpy_fromiovec(payload, msg->msg_iov, paylen); |
| 1022 | if (err < 0) |
| 1023 | goto err_copy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1026 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
| 1027 | sctp_addto_chunk(retval, paylen, payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
| 1029 | if (paylen) |
| 1030 | kfree(payload); |
| 1031 | |
| 1032 | return retval; |
| 1033 | |
| 1034 | err_copy: |
| 1035 | kfree(payload); |
| 1036 | err_payload: |
| 1037 | sctp_chunk_free(retval); |
| 1038 | retval = NULL; |
| 1039 | err_chunk: |
| 1040 | return retval; |
| 1041 | } |
| 1042 | |
Adrian Bunk | 5c94bf8 | 2007-09-12 15:16:21 +0200 | [diff] [blame] | 1043 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
| 1044 | * enough. |
| 1045 | */ |
| 1046 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
| 1047 | const void *data) |
| 1048 | { |
| 1049 | void *target; |
| 1050 | int chunklen = ntohs(chunk->chunk_hdr->length); |
| 1051 | |
| 1052 | target = skb_put(chunk->skb, len); |
| 1053 | |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 1054 | if (data) |
| 1055 | memcpy(target, data, len); |
| 1056 | else |
| 1057 | memset(target, 0, len); |
Adrian Bunk | 5c94bf8 | 2007-09-12 15:16:21 +0200 | [diff] [blame] | 1058 | |
| 1059 | /* Adjust the chunk length field. */ |
| 1060 | chunk->chunk_hdr->length = htons(chunklen + len); |
| 1061 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
| 1062 | |
| 1063 | return target; |
| 1064 | } |
| 1065 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1066 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | struct sctp_chunk *sctp_make_abort_violation( |
| 1068 | const struct sctp_association *asoc, |
| 1069 | const struct sctp_chunk *chunk, |
| 1070 | const __u8 *payload, |
| 1071 | const size_t paylen) |
| 1072 | { |
| 1073 | struct sctp_chunk *retval; |
| 1074 | struct sctp_paramhdr phdr; |
| 1075 | |
| 1076 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1077 | + sizeof(sctp_paramhdr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | if (!retval) |
| 1079 | goto end; |
| 1080 | |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1081 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen |
| 1082 | + sizeof(sctp_paramhdr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
| 1084 | phdr.type = htons(chunk->chunk_hdr->type); |
| 1085 | phdr.length = chunk->chunk_hdr->length; |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1086 | sctp_addto_chunk(retval, paylen, payload); |
| 1087 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
| 1089 | end: |
| 1090 | return retval; |
| 1091 | } |
| 1092 | |
Wei Yongjun | ba01667 | 2008-09-30 05:32:24 -0700 | [diff] [blame] | 1093 | struct sctp_chunk *sctp_make_violation_paramlen( |
| 1094 | const struct sctp_association *asoc, |
| 1095 | const struct sctp_chunk *chunk, |
| 1096 | struct sctp_paramhdr *param) |
| 1097 | { |
| 1098 | struct sctp_chunk *retval; |
| 1099 | static const char error[] = "The following parameter had invalid length:"; |
| 1100 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + |
| 1101 | sizeof(sctp_paramhdr_t); |
| 1102 | |
| 1103 | retval = sctp_make_abort(asoc, chunk, payload_len); |
| 1104 | if (!retval) |
| 1105 | goto nodata; |
| 1106 | |
| 1107 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, |
| 1108 | sizeof(error) + sizeof(sctp_paramhdr_t)); |
| 1109 | sctp_addto_chunk(retval, sizeof(error), error); |
| 1110 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); |
| 1111 | |
| 1112 | nodata: |
| 1113 | return retval; |
| 1114 | } |
| 1115 | |
Neil Horman | de4594a | 2012-11-20 10:14:30 +0000 | [diff] [blame] | 1116 | struct sctp_chunk *sctp_make_violation_max_retrans( |
| 1117 | const struct sctp_association *asoc, |
| 1118 | const struct sctp_chunk *chunk) |
| 1119 | { |
| 1120 | struct sctp_chunk *retval; |
| 1121 | static const char error[] = "Association exceeded its max_retans count"; |
| 1122 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); |
| 1123 | |
| 1124 | retval = sctp_make_abort(asoc, chunk, payload_len); |
| 1125 | if (!retval) |
| 1126 | goto nodata; |
| 1127 | |
| 1128 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); |
| 1129 | sctp_addto_chunk(retval, sizeof(error), error); |
| 1130 | |
| 1131 | nodata: |
| 1132 | return retval; |
| 1133 | } |
| 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | /* Make a HEARTBEAT chunk. */ |
| 1136 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, |
Wei Yongjun | 92c73af | 2011-04-19 21:31:47 +0000 | [diff] [blame] | 1137 | const struct sctp_transport *transport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | { |
Wei Yongjun | 92c73af | 2011-04-19 21:31:47 +0000 | [diff] [blame] | 1139 | struct sctp_chunk *retval; |
| 1140 | sctp_sender_hb_info_t hbinfo; |
| 1141 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1142 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
| 1144 | if (!retval) |
| 1145 | goto nodata; |
| 1146 | |
Wei Yongjun | 92c73af | 2011-04-19 21:31:47 +0000 | [diff] [blame] | 1147 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
| 1148 | hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); |
| 1149 | hbinfo.daddr = transport->ipaddr; |
| 1150 | hbinfo.sent_at = jiffies; |
| 1151 | hbinfo.hb_nonce = transport->hb_nonce; |
| 1152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | /* Cast away the 'const', as this is just telling the chunk |
| 1154 | * what transport it belongs to. |
| 1155 | */ |
| 1156 | retval->transport = (struct sctp_transport *) transport; |
Wei Yongjun | 92c73af | 2011-04-19 21:31:47 +0000 | [diff] [blame] | 1157 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
| 1158 | &hbinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
| 1160 | nodata: |
| 1161 | return retval; |
| 1162 | } |
| 1163 | |
| 1164 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, |
| 1165 | const struct sctp_chunk *chunk, |
| 1166 | const void *payload, const size_t paylen) |
| 1167 | { |
| 1168 | struct sctp_chunk *retval; |
| 1169 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1170 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | if (!retval) |
| 1172 | goto nodata; |
| 1173 | |
| 1174 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); |
| 1175 | |
| 1176 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 1177 | * |
| 1178 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 1179 | * HEARTBEAT ACK, * etc.) to the same destination transport |
| 1180 | * address from which it * received the DATA or control chunk |
| 1181 | * to which it is replying. |
| 1182 | * |
| 1183 | * [HBACK back to where the HEARTBEAT came from.] |
| 1184 | */ |
| 1185 | if (chunk) |
| 1186 | retval->transport = chunk->transport; |
| 1187 | |
| 1188 | nodata: |
| 1189 | return retval; |
| 1190 | } |
| 1191 | |
| 1192 | /* Create an Operation Error chunk with the specified space reserved. |
| 1193 | * This routine can be used for containing multiple causes in the chunk. |
| 1194 | */ |
| 1195 | static struct sctp_chunk *sctp_make_op_error_space( |
| 1196 | const struct sctp_association *asoc, |
| 1197 | const struct sctp_chunk *chunk, |
| 1198 | size_t size) |
| 1199 | { |
| 1200 | struct sctp_chunk *retval; |
| 1201 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1202 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
| 1203 | sizeof(sctp_errhdr_t) + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | if (!retval) |
| 1205 | goto nodata; |
| 1206 | |
| 1207 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
| 1208 | * |
| 1209 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
| 1210 | * HEARTBEAT ACK, etc.) to the same destination transport |
| 1211 | * address from which it received the DATA or control chunk |
| 1212 | * to which it is replying. |
| 1213 | * |
| 1214 | */ |
| 1215 | if (chunk) |
| 1216 | retval->transport = chunk->transport; |
| 1217 | |
| 1218 | nodata: |
| 1219 | return retval; |
| 1220 | } |
| 1221 | |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 1222 | /* Create an Operation Error chunk of a fixed size, |
| 1223 | * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) |
| 1224 | * This is a helper function to allocate an error chunk for |
| 1225 | * for those invalid parameter codes in which we may not want |
Jorrit Schippers | d82603c | 2012-12-27 17:33:02 +0100 | [diff] [blame] | 1226 | * to report all the errors, if the incoming chunk is large |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 1227 | */ |
| 1228 | static inline struct sctp_chunk *sctp_make_op_error_fixed( |
| 1229 | const struct sctp_association *asoc, |
| 1230 | const struct sctp_chunk *chunk) |
| 1231 | { |
| 1232 | size_t size = asoc ? asoc->pathmtu : 0; |
| 1233 | |
| 1234 | if (!size) |
| 1235 | size = SCTP_DEFAULT_MAXSEGMENT; |
| 1236 | |
| 1237 | return sctp_make_op_error_space(asoc, chunk, size); |
| 1238 | } |
| 1239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | /* Create an Operation Error chunk. */ |
| 1241 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, |
| 1242 | const struct sctp_chunk *chunk, |
Al Viro | 63706c5 | 2006-11-20 17:00:05 -0800 | [diff] [blame] | 1243 | __be16 cause_code, const void *payload, |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 1244 | size_t paylen, size_t reserve_tail) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | { |
| 1246 | struct sctp_chunk *retval; |
| 1247 | |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 1248 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | if (!retval) |
| 1250 | goto nodata; |
| 1251 | |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 1252 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1253 | sctp_addto_chunk(retval, paylen, payload); |
Vlad Yasevich | 6383cfb | 2009-11-23 15:53:56 -0500 | [diff] [blame] | 1254 | if (reserve_tail) |
| 1255 | sctp_addto_param(retval, reserve_tail, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
| 1257 | nodata: |
| 1258 | return retval; |
| 1259 | } |
| 1260 | |
Vlad Yasevich | 4cd57c8 | 2007-09-16 19:32:45 -0700 | [diff] [blame] | 1261 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) |
| 1262 | { |
| 1263 | struct sctp_chunk *retval; |
| 1264 | struct sctp_hmac *hmac_desc; |
| 1265 | struct sctp_authhdr auth_hdr; |
| 1266 | __u8 *hmac; |
| 1267 | |
| 1268 | /* Get the first hmac that the peer told us to use */ |
| 1269 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); |
| 1270 | if (unlikely(!hmac_desc)) |
| 1271 | return NULL; |
| 1272 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1273 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
Vlad Yasevich | 4cd57c8 | 2007-09-16 19:32:45 -0700 | [diff] [blame] | 1274 | hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); |
| 1275 | if (!retval) |
| 1276 | return NULL; |
| 1277 | |
| 1278 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); |
| 1279 | auth_hdr.shkey_id = htons(asoc->active_key_id); |
| 1280 | |
| 1281 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), |
| 1282 | &auth_hdr); |
| 1283 | |
| 1284 | hmac = skb_put(retval->skb, hmac_desc->hmac_len); |
| 1285 | memset(hmac, 0, hmac_desc->hmac_len); |
| 1286 | |
| 1287 | /* Adjust the chunk header to include the empty MAC */ |
| 1288 | retval->chunk_hdr->length = |
| 1289 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); |
| 1290 | retval->chunk_end = skb_tail_pointer(retval->skb); |
| 1291 | |
| 1292 | return retval; |
| 1293 | } |
| 1294 | |
| 1295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | /******************************************************************** |
| 1297 | * 2nd Level Abstractions |
| 1298 | ********************************************************************/ |
| 1299 | |
| 1300 | /* Turn an skb into a chunk. |
| 1301 | * FIXME: Eventually move the structure directly inside the skb->cb[]. |
wangweidong | 3dc0a54 | 2013-10-26 16:06:31 +0800 | [diff] [blame] | 1302 | * |
| 1303 | * sctpimpguide-05.txt Section 2.8.2 |
| 1304 | * M1) Each time a new DATA chunk is transmitted |
| 1305 | * set the 'TSN.Missing.Report' count for that TSN to 0. The |
| 1306 | * 'TSN.Missing.Report' count will be used to determine missing chunks |
| 1307 | * and when to fast retransmit. |
| 1308 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | */ |
| 1310 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, |
| 1311 | const struct sctp_association *asoc, |
| 1312 | struct sock *sk) |
| 1313 | { |
| 1314 | struct sctp_chunk *retval; |
| 1315 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 1316 | retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | |
| 1318 | if (!retval) |
| 1319 | goto nodata; |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1320 | if (!sk) |
| 1321 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1323 | INIT_LIST_HEAD(&retval->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | retval->skb = skb; |
| 1325 | retval->asoc = (struct sctp_association *)asoc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | retval->singleton = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | |
Neil Horman | c226ef9 | 2008-07-25 12:44:09 -0400 | [diff] [blame] | 1328 | retval->fast_retransmit = SCTP_CAN_FRTX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | /* Polish the bead hole. */ |
| 1331 | INIT_LIST_HEAD(&retval->transmitted_list); |
| 1332 | INIT_LIST_HEAD(&retval->frag_list); |
| 1333 | SCTP_DBG_OBJCNT_INC(chunk); |
| 1334 | atomic_set(&retval->refcnt, 1); |
| 1335 | |
| 1336 | nodata: |
| 1337 | return retval; |
| 1338 | } |
| 1339 | |
| 1340 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ |
| 1341 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, |
| 1342 | union sctp_addr *dest) |
| 1343 | { |
Al Viro | f235fca | 2006-11-20 17:09:01 -0800 | [diff] [blame] | 1344 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
Al Viro | 16b0a03 | 2006-11-20 17:13:38 -0800 | [diff] [blame] | 1345 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
| 1348 | /* Extract the source address from a chunk. */ |
| 1349 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) |
| 1350 | { |
| 1351 | /* If we have a known transport, use that. */ |
| 1352 | if (chunk->transport) { |
Al Viro | 6a1e5f3 | 2006-11-20 17:12:25 -0800 | [diff] [blame] | 1353 | return &chunk->transport->ipaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | } else { |
| 1355 | /* Otherwise, extract it from the IP header. */ |
Al Viro | 6a1e5f3 | 2006-11-20 17:12:25 -0800 | [diff] [blame] | 1356 | return &chunk->source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | } |
| 1358 | } |
| 1359 | |
| 1360 | /* Create a new chunk, setting the type and flags headers from the |
| 1361 | * arguments, reserving enough space for a 'paylen' byte payload. |
| 1362 | */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1363 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
| 1364 | __u8 type, __u8 flags, int paylen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | { |
| 1366 | struct sctp_chunk *retval; |
| 1367 | sctp_chunkhdr_t *chunk_hdr; |
| 1368 | struct sk_buff *skb; |
| 1369 | struct sock *sk; |
| 1370 | |
| 1371 | /* No need to allocate LL here, as this is only a chunk. */ |
| 1372 | skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), |
| 1373 | GFP_ATOMIC); |
| 1374 | if (!skb) |
| 1375 | goto nodata; |
| 1376 | |
| 1377 | /* Make room for the chunk header. */ |
| 1378 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); |
| 1379 | chunk_hdr->type = type; |
| 1380 | chunk_hdr->flags = flags; |
| 1381 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); |
| 1382 | |
| 1383 | sk = asoc ? asoc->base.sk : NULL; |
| 1384 | retval = sctp_chunkify(skb, asoc, sk); |
| 1385 | if (!retval) { |
| 1386 | kfree_skb(skb); |
| 1387 | goto nodata; |
| 1388 | } |
| 1389 | |
| 1390 | retval->chunk_hdr = chunk_hdr; |
| 1391 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); |
| 1392 | |
Vlad Yasevich | 4cd57c8 | 2007-09-16 19:32:45 -0700 | [diff] [blame] | 1393 | /* Determine if the chunk needs to be authenticated */ |
| 1394 | if (sctp_auth_send_cid(type, asoc)) |
| 1395 | retval->auth = 1; |
| 1396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | return retval; |
| 1398 | nodata: |
| 1399 | return NULL; |
| 1400 | } |
| 1401 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 1402 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
| 1403 | __u8 flags, int paylen) |
| 1404 | { |
| 1405 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen); |
| 1406 | } |
| 1407 | |
| 1408 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
| 1409 | __u8 type, __u8 flags, int paylen) |
| 1410 | { |
| 1411 | struct sctp_chunk *chunk = _sctp_make_chunk(asoc, type, flags, paylen); |
| 1412 | |
| 1413 | if (chunk) |
| 1414 | sctp_control_set_owner_w(chunk); |
| 1415 | |
| 1416 | return chunk; |
| 1417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
| 1419 | /* Release the memory occupied by a chunk. */ |
| 1420 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) |
| 1421 | { |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1422 | BUG_ON(!list_empty(&chunk->list)); |
| 1423 | list_del_init(&chunk->transmitted_list); |
| 1424 | |
Daniel Borkmann | c485658 | 2014-03-04 16:35:51 +0100 | [diff] [blame] | 1425 | consume_skb(chunk->skb); |
| 1426 | consume_skb(chunk->auth_chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | SCTP_DBG_OBJCNT_DEC(chunk); |
| 1429 | kmem_cache_free(sctp_chunk_cachep, chunk); |
| 1430 | } |
| 1431 | |
| 1432 | /* Possibly, free the chunk. */ |
| 1433 | void sctp_chunk_free(struct sctp_chunk *chunk) |
| 1434 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | /* Release our reference on the message tracker. */ |
| 1436 | if (chunk->msg) |
| 1437 | sctp_datamsg_put(chunk->msg); |
| 1438 | |
| 1439 | sctp_chunk_put(chunk); |
| 1440 | } |
| 1441 | |
| 1442 | /* Grab a reference to the chunk. */ |
| 1443 | void sctp_chunk_hold(struct sctp_chunk *ch) |
| 1444 | { |
| 1445 | atomic_inc(&ch->refcnt); |
| 1446 | } |
| 1447 | |
| 1448 | /* Release a reference to the chunk. */ |
| 1449 | void sctp_chunk_put(struct sctp_chunk *ch) |
| 1450 | { |
| 1451 | if (atomic_dec_and_test(&ch->refcnt)) |
| 1452 | sctp_chunk_destroy(ch); |
| 1453 | } |
| 1454 | |
| 1455 | /* Append bytes to the end of a chunk. Will panic if chunk is not big |
| 1456 | * enough. |
| 1457 | */ |
| 1458 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) |
| 1459 | { |
| 1460 | void *target; |
| 1461 | void *padding; |
| 1462 | int chunklen = ntohs(chunk->chunk_hdr->length); |
Wei Yongjun | 8d614ad | 2007-08-06 13:55:47 +0800 | [diff] [blame] | 1463 | int padlen = WORD_ROUND(chunklen) - chunklen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | |
| 1465 | padding = skb_put(chunk->skb, padlen); |
| 1466 | target = skb_put(chunk->skb, len); |
| 1467 | |
| 1468 | memset(padding, 0, padlen); |
| 1469 | memcpy(target, data, len); |
| 1470 | |
| 1471 | /* Adjust the chunk length field. */ |
| 1472 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1473 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | |
| 1475 | return target; |
| 1476 | } |
| 1477 | |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 1478 | /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient |
| 1479 | * space in the chunk |
| 1480 | */ |
stephen hemminger | 6daaf0d | 2014-01-09 22:31:11 -0800 | [diff] [blame] | 1481 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, |
| 1482 | int len, const void *data) |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 1483 | { |
Wei Yongjun | 2e3219b | 2010-05-17 22:51:58 -0700 | [diff] [blame] | 1484 | if (skb_tailroom(chunk->skb) >= len) |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 1485 | return sctp_addto_chunk(chunk, len, data); |
| 1486 | else |
| 1487 | return NULL; |
| 1488 | } |
| 1489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | /* Append bytes from user space to the end of a chunk. Will panic if |
| 1491 | * chunk is not big enough. |
| 1492 | * Returns a kernel err value. |
| 1493 | */ |
| 1494 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, |
| 1495 | struct iovec *data) |
| 1496 | { |
| 1497 | __u8 *target; |
| 1498 | int err = 0; |
| 1499 | |
| 1500 | /* Make room in chunk for data. */ |
| 1501 | target = skb_put(chunk->skb, len); |
| 1502 | |
| 1503 | /* Copy data (whole iovec) into chunk */ |
| 1504 | if ((err = memcpy_fromiovecend(target, data, off, len))) |
| 1505 | goto out; |
| 1506 | |
| 1507 | /* Adjust the chunk length field. */ |
| 1508 | chunk->chunk_hdr->length = |
| 1509 | htons(ntohs(chunk->chunk_hdr->length) + len); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1510 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
| 1512 | out: |
| 1513 | return err; |
| 1514 | } |
| 1515 | |
| 1516 | /* Helper function to assign a TSN if needed. This assumes that both |
| 1517 | * the data_hdr and association have already been assigned. |
| 1518 | */ |
| 1519 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) |
| 1520 | { |
Vlad Yasevich | ab3e5e7 | 2007-08-02 16:51:42 -0400 | [diff] [blame] | 1521 | struct sctp_datamsg *msg; |
| 1522 | struct sctp_chunk *lchunk; |
| 1523 | struct sctp_stream *stream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | __u16 ssn; |
| 1525 | __u16 sid; |
| 1526 | |
| 1527 | if (chunk->has_ssn) |
| 1528 | return; |
| 1529 | |
Vlad Yasevich | ab3e5e7 | 2007-08-02 16:51:42 -0400 | [diff] [blame] | 1530 | /* All fragments will be on the same stream */ |
| 1531 | sid = ntohs(chunk->subh.data_hdr->stream); |
| 1532 | stream = &chunk->asoc->ssnmap->out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
Vlad Yasevich | ab3e5e7 | 2007-08-02 16:51:42 -0400 | [diff] [blame] | 1534 | /* Now assign the sequence number to the entire message. |
| 1535 | * All fragments must have the same stream sequence number. |
| 1536 | */ |
| 1537 | msg = chunk->msg; |
| 1538 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { |
| 1539 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
| 1540 | ssn = 0; |
| 1541 | } else { |
| 1542 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) |
| 1543 | ssn = sctp_ssn_next(stream, sid); |
| 1544 | else |
| 1545 | ssn = sctp_ssn_peek(stream, sid); |
| 1546 | } |
| 1547 | |
| 1548 | lchunk->subh.data_hdr->ssn = htons(ssn); |
| 1549 | lchunk->has_ssn = 1; |
| 1550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | } |
| 1552 | |
| 1553 | /* Helper function to assign a TSN if needed. This assumes that both |
| 1554 | * the data_hdr and association have already been assigned. |
| 1555 | */ |
| 1556 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) |
| 1557 | { |
| 1558 | if (!chunk->has_tsn) { |
| 1559 | /* This is the last possible instant to |
| 1560 | * assign a TSN. |
| 1561 | */ |
| 1562 | chunk->subh.data_hdr->tsn = |
| 1563 | htonl(sctp_association_get_next_tsn(chunk->asoc)); |
| 1564 | chunk->has_tsn = 1; |
| 1565 | } |
| 1566 | } |
| 1567 | |
| 1568 | /* Create a CLOSED association to use with an incoming packet. */ |
| 1569 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1570 | struct sctp_chunk *chunk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1571 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | { |
| 1573 | struct sctp_association *asoc; |
| 1574 | struct sk_buff *skb; |
| 1575 | sctp_scope_t scope; |
| 1576 | struct sctp_af *af; |
| 1577 | |
| 1578 | /* Create the bare association. */ |
| 1579 | scope = sctp_scope(sctp_source(chunk)); |
| 1580 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); |
| 1581 | if (!asoc) |
| 1582 | goto nodata; |
| 1583 | asoc->temp = 1; |
| 1584 | skb = chunk->skb; |
| 1585 | /* Create an entry for the source address of the packet. */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1586 | af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | if (unlikely(!af)) |
| 1588 | goto fail; |
Al Viro | d55c41b | 2006-11-20 17:09:40 -0800 | [diff] [blame] | 1589 | af->from_skb(&asoc->c.peer_addr, skb, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | nodata: |
| 1591 | return asoc; |
| 1592 | |
| 1593 | fail: |
| 1594 | sctp_association_free(asoc); |
| 1595 | return NULL; |
| 1596 | } |
| 1597 | |
| 1598 | /* Build a cookie representing asoc. |
| 1599 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. |
| 1600 | */ |
| 1601 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
| 1602 | const struct sctp_association *asoc, |
| 1603 | const struct sctp_chunk *init_chunk, |
| 1604 | int *cookie_len, |
| 1605 | const __u8 *raw_addrs, int addrs_len) |
| 1606 | { |
| 1607 | sctp_cookie_param_t *retval; |
| 1608 | struct sctp_signed_cookie *cookie; |
| 1609 | struct scatterlist sg; |
| 1610 | int headersize, bodysize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 1612 | /* Header size is static data prior to the actual cookie, including |
| 1613 | * any padding. |
| 1614 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1615 | headersize = sizeof(sctp_paramhdr_t) + |
| 1616 | (sizeof(struct sctp_signed_cookie) - |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 1617 | sizeof(struct sctp_cookie)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | bodysize = sizeof(struct sctp_cookie) |
| 1619 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; |
| 1620 | |
| 1621 | /* Pad out the cookie to a multiple to make the signature |
| 1622 | * functions simpler to write. |
| 1623 | */ |
| 1624 | if (bodysize % SCTP_COOKIE_MULTIPLE) |
| 1625 | bodysize += SCTP_COOKIE_MULTIPLE |
| 1626 | - (bodysize % SCTP_COOKIE_MULTIPLE); |
| 1627 | *cookie_len = headersize + bodysize; |
| 1628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | /* Clear this memory since we are sending this data structure |
| 1630 | * out on the network. |
| 1631 | */ |
Arnaldo Carvalho de Melo | af997d8 | 2006-11-21 01:20:33 -0200 | [diff] [blame] | 1632 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
| 1633 | if (!retval) |
| 1634 | goto nodata; |
| 1635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | cookie = (struct sctp_signed_cookie *) retval->body; |
| 1637 | |
| 1638 | /* Set up the parameter header. */ |
| 1639 | retval->p.type = SCTP_PARAM_STATE_COOKIE; |
| 1640 | retval->p.length = htons(*cookie_len); |
| 1641 | |
| 1642 | /* Copy the cookie part of the association itself. */ |
| 1643 | cookie->c = asoc->c; |
| 1644 | /* Save the raw address list length in the cookie. */ |
| 1645 | cookie->c.raw_addr_list_len = addrs_len; |
| 1646 | |
| 1647 | /* Remember PR-SCTP capability. */ |
| 1648 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; |
| 1649 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 1650 | /* Save adaptation indication in the cookie. */ |
| 1651 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | |
| 1653 | /* Set an expiration time for the cookie. */ |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 1654 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
| 1655 | ktime_get()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | |
| 1657 | /* Copy the peer's init packet. */ |
| 1658 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, |
| 1659 | ntohs(init_chunk->chunk_hdr->length)); |
| 1660 | |
| 1661 | /* Copy the raw local address list of the association. */ |
| 1662 | memcpy((__u8 *)&cookie->c.peer_init[0] + |
| 1663 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); |
| 1664 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1665 | if (sctp_sk(ep->base.sk)->hmac) { |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1666 | struct hash_desc desc; |
| 1667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | /* Sign the message. */ |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 1669 | sg_init_one(&sg, &cookie->c, bodysize); |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1670 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
| 1671 | desc.flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | |
Daniel Borkmann | 570617e | 2013-02-12 05:15:33 +0000 | [diff] [blame] | 1673 | if (crypto_hash_setkey(desc.tfm, ep->secret_key, |
| 1674 | sizeof(ep->secret_key)) || |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1675 | crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) |
| 1676 | goto free_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | } |
| 1678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | return retval; |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1680 | |
| 1681 | free_cookie: |
| 1682 | kfree(retval); |
| 1683 | nodata: |
| 1684 | *cookie_len = 0; |
| 1685 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | } |
| 1687 | |
| 1688 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ |
| 1689 | struct sctp_association *sctp_unpack_cookie( |
| 1690 | const struct sctp_endpoint *ep, |
| 1691 | const struct sctp_association *asoc, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1692 | struct sctp_chunk *chunk, gfp_t gfp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | int *error, struct sctp_chunk **errp) |
| 1694 | { |
| 1695 | struct sctp_association *retval = NULL; |
| 1696 | struct sctp_signed_cookie *cookie; |
| 1697 | struct sctp_cookie *bear_cookie; |
| 1698 | int headersize, bodysize, fixed_size; |
Vlad Yasevich | 313e7b4 | 2006-01-17 11:55:57 -0800 | [diff] [blame] | 1699 | __u8 *digest = ep->digest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | struct scatterlist sg; |
Daniel Borkmann | 570617e | 2013-02-12 05:15:33 +0000 | [diff] [blame] | 1701 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | sctp_scope_t scope; |
| 1703 | struct sk_buff *skb = chunk->skb; |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 1704 | ktime_t kt; |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1705 | struct hash_desc desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 1707 | /* Header size is static data prior to the actual cookie, including |
| 1708 | * any padding. |
| 1709 | */ |
| 1710 | headersize = sizeof(sctp_chunkhdr_t) + |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1711 | (sizeof(struct sctp_signed_cookie) - |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 1712 | sizeof(struct sctp_cookie)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
| 1714 | fixed_size = headersize + sizeof(struct sctp_cookie); |
| 1715 | |
| 1716 | /* Verify that the chunk looks like it even has a cookie. |
| 1717 | * There must be enough room for our cookie and our peer's |
| 1718 | * INIT chunk. |
| 1719 | */ |
| 1720 | len = ntohs(chunk->chunk_hdr->length); |
| 1721 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) |
| 1722 | goto malformed; |
| 1723 | |
| 1724 | /* Verify that the cookie has been padded out. */ |
| 1725 | if (bodysize % SCTP_COOKIE_MULTIPLE) |
| 1726 | goto malformed; |
| 1727 | |
| 1728 | /* Process the cookie. */ |
| 1729 | cookie = chunk->subh.cookie_hdr; |
| 1730 | bear_cookie = &cookie->c; |
| 1731 | |
| 1732 | if (!sctp_sk(ep->base.sk)->hmac) |
| 1733 | goto no_hmac; |
| 1734 | |
| 1735 | /* Check the signature. */ |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 1736 | sg_init_one(&sg, bear_cookie, bodysize); |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1737 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
| 1738 | desc.flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | |
Al Viro | 8ca8448 | 2006-06-20 03:26:14 -0700 | [diff] [blame] | 1740 | memset(digest, 0x00, SCTP_SIGNATURE_SIZE); |
Daniel Borkmann | 570617e | 2013-02-12 05:15:33 +0000 | [diff] [blame] | 1741 | if (crypto_hash_setkey(desc.tfm, ep->secret_key, |
| 1742 | sizeof(ep->secret_key)) || |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 1743 | crypto_hash_digest(&desc, &sg, bodysize, digest)) { |
| 1744 | *error = -SCTP_IERROR_NOMEM; |
| 1745 | goto fail; |
| 1746 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
| 1748 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { |
Daniel Borkmann | 570617e | 2013-02-12 05:15:33 +0000 | [diff] [blame] | 1749 | *error = -SCTP_IERROR_BAD_SIG; |
| 1750 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | } |
| 1752 | |
| 1753 | no_hmac: |
| 1754 | /* IG Section 2.35.2: |
| 1755 | * 3) Compare the port numbers and the verification tag contained |
| 1756 | * within the COOKIE ECHO chunk to the actual port numbers and the |
| 1757 | * verification tag within the SCTP common header of the received |
| 1758 | * packet. If these values do not match the packet MUST be silently |
| 1759 | * discarded, |
| 1760 | */ |
| 1761 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { |
| 1762 | *error = -SCTP_IERROR_BAD_TAG; |
| 1763 | goto fail; |
| 1764 | } |
| 1765 | |
Al Viro | 9b1dfad | 2006-11-20 17:09:17 -0800 | [diff] [blame] | 1766 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
| 1768 | *error = -SCTP_IERROR_BAD_PORTS; |
| 1769 | goto fail; |
| 1770 | } |
| 1771 | |
| 1772 | /* Check to see if the cookie is stale. If there is already |
| 1773 | * an association, there is no need to check cookie's expiration |
| 1774 | * for init collision case of lost COOKIE ACK. |
Vlad Yasevich | f236218b | 2006-09-29 17:10:03 -0700 | [diff] [blame] | 1775 | * If skb has been timestamped, then use the stamp, otherwise |
| 1776 | * use current time. This introduces a small possibility that |
| 1777 | * that a cookie may be considered expired, but his would only slow |
| 1778 | * down the new association establishment instead of every packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | */ |
Vlad Yasevich | f236218b | 2006-09-29 17:10:03 -0700 | [diff] [blame] | 1780 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 1781 | kt = skb_get_ktime(skb); |
Vlad Yasevich | f236218b | 2006-09-29 17:10:03 -0700 | [diff] [blame] | 1782 | else |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 1783 | kt = ktime_get(); |
Vlad Yasevich | f236218b | 2006-09-29 17:10:03 -0700 | [diff] [blame] | 1784 | |
Daniel Borkmann | 67cb936 | 2014-06-11 18:19:28 +0200 | [diff] [blame] | 1785 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | /* |
| 1787 | * Section 3.3.10.3 Stale Cookie Error (3) |
| 1788 | * |
| 1789 | * Cause of error |
| 1790 | * --------------- |
| 1791 | * Stale Cookie Error: Indicates the receipt of a valid State |
| 1792 | * Cookie that has expired. |
| 1793 | */ |
| 1794 | len = ntohs(chunk->chunk_hdr->length); |
| 1795 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
| 1796 | if (*errp) { |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 1797 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
Al Viro | 34bcca2 | 2006-11-20 17:27:15 -0800 | [diff] [blame] | 1798 | __be32 n = htonl(usecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1801 | sizeof(n)); |
| 1802 | sctp_addto_chunk(*errp, sizeof(n), &n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | *error = -SCTP_IERROR_STALE_COOKIE; |
| 1804 | } else |
| 1805 | *error = -SCTP_IERROR_NOMEM; |
| 1806 | |
| 1807 | goto fail; |
| 1808 | } |
| 1809 | |
| 1810 | /* Make a new base association. */ |
| 1811 | scope = sctp_scope(sctp_source(chunk)); |
| 1812 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); |
| 1813 | if (!retval) { |
| 1814 | *error = -SCTP_IERROR_NOMEM; |
| 1815 | goto fail; |
| 1816 | } |
| 1817 | |
| 1818 | /* Set up our peer's port number. */ |
| 1819 | retval->peer.port = ntohs(chunk->sctp_hdr->source); |
| 1820 | |
| 1821 | /* Populate the association from the cookie. */ |
| 1822 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); |
| 1823 | |
| 1824 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, |
| 1825 | GFP_ATOMIC) < 0) { |
| 1826 | *error = -SCTP_IERROR_NOMEM; |
| 1827 | goto fail; |
| 1828 | } |
| 1829 | |
| 1830 | /* Also, add the destination address. */ |
| 1831 | if (list_empty(&retval->base.bind_addr.address_list)) { |
Vlad Yasevich | f57d96b | 2007-12-20 14:12:24 -0800 | [diff] [blame] | 1832 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
| 1833 | SCTP_ADDR_SRC, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | } |
| 1835 | |
| 1836 | retval->next_tsn = retval->c.initial_tsn; |
| 1837 | retval->ctsn_ack_point = retval->next_tsn - 1; |
| 1838 | retval->addip_serial = retval->c.initial_tsn; |
| 1839 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
| 1840 | retval->peer.prsctp_capable = retval->c.prsctp_capable; |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 1841 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
| 1843 | /* The INIT stuff will be done by the side effects. */ |
| 1844 | return retval; |
| 1845 | |
| 1846 | fail: |
| 1847 | if (retval) |
| 1848 | sctp_association_free(retval); |
| 1849 | |
| 1850 | return NULL; |
| 1851 | |
| 1852 | malformed: |
| 1853 | /* Yikes! The packet is either corrupt or deliberately |
| 1854 | * malformed. |
| 1855 | */ |
| 1856 | *error = -SCTP_IERROR_MALFORMED; |
| 1857 | goto fail; |
| 1858 | } |
| 1859 | |
| 1860 | /******************************************************************** |
| 1861 | * 3rd Level Abstractions |
| 1862 | ********************************************************************/ |
| 1863 | |
| 1864 | struct __sctp_missing { |
Al Viro | 9f81bcd | 2006-11-20 17:26:34 -0800 | [diff] [blame] | 1865 | __be32 num_missing; |
| 1866 | __be16 type; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 1867 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | |
| 1869 | /* |
| 1870 | * Report a missing mandatory parameter. |
| 1871 | */ |
| 1872 | static int sctp_process_missing_param(const struct sctp_association *asoc, |
| 1873 | sctp_param_t paramtype, |
| 1874 | struct sctp_chunk *chunk, |
| 1875 | struct sctp_chunk **errp) |
| 1876 | { |
| 1877 | struct __sctp_missing report; |
| 1878 | __u16 len; |
| 1879 | |
| 1880 | len = WORD_ROUND(sizeof(report)); |
| 1881 | |
| 1882 | /* Make an ERROR chunk, preparing enough room for |
| 1883 | * returning multiple unknown parameters. |
| 1884 | */ |
| 1885 | if (!*errp) |
| 1886 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
| 1887 | |
| 1888 | if (*errp) { |
| 1889 | report.num_missing = htonl(1); |
| 1890 | report.type = paramtype; |
Vlad Yasevich | ebdfcad | 2007-01-15 19:12:31 -0800 | [diff] [blame] | 1891 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1892 | sizeof(report)); |
| 1893 | sctp_addto_chunk(*errp, sizeof(report), &report); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | } |
| 1895 | |
| 1896 | /* Stop processing this chunk. */ |
| 1897 | return 0; |
| 1898 | } |
| 1899 | |
| 1900 | /* Report an Invalid Mandatory Parameter. */ |
| 1901 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, |
| 1902 | struct sctp_chunk *chunk, |
| 1903 | struct sctp_chunk **errp) |
| 1904 | { |
| 1905 | /* Invalid Mandatory Parameter Error has no payload. */ |
| 1906 | |
| 1907 | if (!*errp) |
| 1908 | *errp = sctp_make_op_error_space(asoc, chunk, 0); |
| 1909 | |
| 1910 | if (*errp) |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1911 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | /* Stop processing this chunk. */ |
| 1914 | return 0; |
| 1915 | } |
| 1916 | |
| 1917 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, |
| 1918 | struct sctp_paramhdr *param, |
| 1919 | const struct sctp_chunk *chunk, |
| 1920 | struct sctp_chunk **errp) |
| 1921 | { |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 1922 | /* This is a fatal error. Any accumulated non-fatal errors are |
| 1923 | * not reported. |
| 1924 | */ |
| 1925 | if (*errp) |
| 1926 | sctp_chunk_free(*errp); |
| 1927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | /* Create an error chunk and fill it in with our payload. */ |
Wei Yongjun | ba01667 | 2008-09-30 05:32:24 -0700 | [diff] [blame] | 1929 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | |
| 1931 | return 0; |
| 1932 | } |
| 1933 | |
| 1934 | |
| 1935 | /* Do not attempt to handle the HOST_NAME parm. However, do |
| 1936 | * send back an indicator to the peer. |
| 1937 | */ |
| 1938 | static int sctp_process_hn_param(const struct sctp_association *asoc, |
| 1939 | union sctp_params param, |
| 1940 | struct sctp_chunk *chunk, |
| 1941 | struct sctp_chunk **errp) |
| 1942 | { |
| 1943 | __u16 len = ntohs(param.p->length); |
| 1944 | |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 1945 | /* Processing of the HOST_NAME parameter will generate an |
| 1946 | * ABORT. If we've accumulated any non-fatal errors, they |
| 1947 | * would be unrecognized parameters and we should not include |
| 1948 | * them in the ABORT. |
| 1949 | */ |
| 1950 | if (*errp) |
| 1951 | sctp_chunk_free(*errp); |
| 1952 | |
| 1953 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | |
Wei Yongjun | 00f1c2d | 2007-08-21 15:50:01 +0800 | [diff] [blame] | 1955 | if (*errp) { |
| 1956 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); |
| 1957 | sctp_addto_chunk(*errp, len, param.v); |
| 1958 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | |
| 1960 | /* Stop processing this chunk. */ |
| 1961 | return 0; |
| 1962 | } |
| 1963 | |
Eric W. Biederman | f53b5b0 | 2012-08-07 07:29:08 +0000 | [diff] [blame] | 1964 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 1965 | { |
| 1966 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
| 1967 | int have_auth = 0; |
| 1968 | int have_asconf = 0; |
| 1969 | int i; |
| 1970 | |
| 1971 | for (i = 0; i < num_ext; i++) { |
| 1972 | switch (param.ext->chunks[i]) { |
wangweidong | f7010e6 | 2013-12-23 12:16:52 +0800 | [diff] [blame] | 1973 | case SCTP_CID_AUTH: |
| 1974 | have_auth = 1; |
| 1975 | break; |
| 1976 | case SCTP_CID_ASCONF: |
| 1977 | case SCTP_CID_ASCONF_ACK: |
| 1978 | have_asconf = 1; |
| 1979 | break; |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 1980 | } |
| 1981 | } |
| 1982 | |
| 1983 | /* ADD-IP Security: The draft requires us to ABORT or ignore the |
| 1984 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this |
| 1985 | * only if ADD-IP is turned on and we are not backward-compatible |
| 1986 | * mode. |
| 1987 | */ |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 1988 | if (net->sctp.addip_noauth) |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 1989 | return 1; |
| 1990 | |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 1991 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 1992 | return 0; |
| 1993 | |
| 1994 | return 1; |
| 1995 | } |
| 1996 | |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 1997 | static void sctp_process_ext_param(struct sctp_association *asoc, |
| 1998 | union sctp_params param) |
| 1999 | { |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2000 | struct net *net = sock_net(asoc->base.sk); |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2001 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
| 2002 | int i; |
| 2003 | |
| 2004 | for (i = 0; i < num_ext; i++) { |
| 2005 | switch (param.ext->chunks[i]) { |
wangweidong | f7010e6 | 2013-12-23 12:16:52 +0800 | [diff] [blame] | 2006 | case SCTP_CID_FWD_TSN: |
| 2007 | if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable) |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2008 | asoc->peer.prsctp_capable = 1; |
wangweidong | f7010e6 | 2013-12-23 12:16:52 +0800 | [diff] [blame] | 2009 | break; |
| 2010 | case SCTP_CID_AUTH: |
| 2011 | /* if the peer reports AUTH, assume that he |
| 2012 | * supports AUTH. |
| 2013 | */ |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2014 | if (asoc->ep->auth_enable) |
wangweidong | f7010e6 | 2013-12-23 12:16:52 +0800 | [diff] [blame] | 2015 | asoc->peer.auth_capable = 1; |
| 2016 | break; |
| 2017 | case SCTP_CID_ASCONF: |
| 2018 | case SCTP_CID_ASCONF_ACK: |
| 2019 | if (net->sctp.addip_enable) |
| 2020 | asoc->peer.asconf_capable = 1; |
| 2021 | break; |
| 2022 | default: |
| 2023 | break; |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2024 | } |
| 2025 | } |
| 2026 | } |
| 2027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
| 2029 | * |
| 2030 | * The Parameter Types are encoded such that the |
| 2031 | * highest-order two bits specify the action that must be |
| 2032 | * taken if the processing endpoint does not recognize the |
| 2033 | * Parameter Type. |
| 2034 | * |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2035 | * 00 - Stop processing this parameter; do not process any further |
| 2036 | * parameters within this chunk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | * |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2038 | * 01 - Stop processing this parameter, do not process any further |
| 2039 | * parameters within this chunk, and report the unrecognized |
| 2040 | * parameter in an 'Unrecognized Parameter' ERROR chunk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | * |
| 2042 | * 10 - Skip this parameter and continue processing. |
| 2043 | * |
| 2044 | * 11 - Skip this parameter and continue processing but |
| 2045 | * report the unrecognized parameter in an |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2046 | * 'Unrecognized Parameter' ERROR chunk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | * |
| 2048 | * Return value: |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2049 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
| 2050 | * SCTP_IERROR_ERROR - stop and report an error. |
| 2051 | * SCTP_IERROR_NOMEME - out of memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | */ |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2053 | static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, |
| 2054 | union sctp_params param, |
| 2055 | struct sctp_chunk *chunk, |
| 2056 | struct sctp_chunk **errp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | { |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2058 | int retval = SCTP_IERROR_NO_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
| 2060 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { |
| 2061 | case SCTP_PARAM_ACTION_DISCARD: |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2062 | retval = SCTP_IERROR_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | break; |
| 2064 | case SCTP_PARAM_ACTION_SKIP: |
| 2065 | break; |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2066 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
| 2067 | retval = SCTP_IERROR_ERROR; |
| 2068 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | case SCTP_PARAM_ACTION_SKIP_ERR: |
| 2070 | /* Make an ERROR chunk, preparing enough room for |
| 2071 | * returning multiple unknown parameters. |
| 2072 | */ |
| 2073 | if (NULL == *errp) |
Neil Horman | 5fa782c | 2010-04-28 10:30:59 +0000 | [diff] [blame] | 2074 | *errp = sctp_make_op_error_fixed(asoc, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | |
| 2076 | if (*errp) { |
Jiri Bohac | 2205a6e | 2011-02-17 13:12:08 +0000 | [diff] [blame] | 2077 | if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
| 2078 | WORD_ROUND(ntohs(param.p->length)))) |
| 2079 | sctp_addto_chunk_fixed(*errp, |
| 2080 | WORD_ROUND(ntohs(param.p->length)), |
| 2081 | param.v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | } else { |
| 2083 | /* If there is no memory for generating the ERROR |
| 2084 | * report as specified, an ABORT will be triggered |
| 2085 | * to the peer and the association won't be |
| 2086 | * established. |
| 2087 | */ |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2088 | retval = SCTP_IERROR_NOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | break; |
| 2091 | default: |
| 2092 | break; |
| 2093 | } |
| 2094 | |
| 2095 | return retval; |
| 2096 | } |
| 2097 | |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2098 | /* Verify variable length parameters |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | * Return values: |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2100 | * SCTP_IERROR_ABORT - trigger an ABORT |
| 2101 | * SCTP_IERROR_NOMEM - out of memory (abort) |
| 2102 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR |
| 2103 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | */ |
Eric W. Biederman | f53b5b0 | 2012-08-07 07:29:08 +0000 | [diff] [blame] | 2105 | static sctp_ierror_t sctp_verify_param(struct net *net, |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2106 | const struct sctp_endpoint *ep, |
Eric W. Biederman | f53b5b0 | 2012-08-07 07:29:08 +0000 | [diff] [blame] | 2107 | const struct sctp_association *asoc, |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2108 | union sctp_params param, |
| 2109 | sctp_cid_t cid, |
| 2110 | struct sctp_chunk *chunk, |
| 2111 | struct sctp_chunk **err_chunk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | { |
Wei Yongjun | 72da7b3 | 2008-04-12 18:39:19 -0700 | [diff] [blame] | 2113 | struct sctp_hmac_algo_param *hmacs; |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2114 | int retval = SCTP_IERROR_NO_ERROR; |
Wei Yongjun | 72da7b3 | 2008-04-12 18:39:19 -0700 | [diff] [blame] | 2115 | __u16 n_elt, id = 0; |
| 2116 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | |
| 2118 | /* FIXME - This routine is not looking at each parameter per the |
| 2119 | * chunk type, i.e., unrecognized parameters should be further |
| 2120 | * identified based on the chunk id. |
| 2121 | */ |
| 2122 | |
| 2123 | switch (param.p->type) { |
| 2124 | case SCTP_PARAM_IPV4_ADDRESS: |
| 2125 | case SCTP_PARAM_IPV6_ADDRESS: |
| 2126 | case SCTP_PARAM_COOKIE_PRESERVATIVE: |
| 2127 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: |
| 2128 | case SCTP_PARAM_STATE_COOKIE: |
| 2129 | case SCTP_PARAM_HEARTBEAT_INFO: |
| 2130 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: |
| 2131 | case SCTP_PARAM_ECN_CAPABLE: |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 2132 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 2133 | break; |
| 2134 | |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2135 | case SCTP_PARAM_SUPPORTED_EXT: |
Eric W. Biederman | f53b5b0 | 2012-08-07 07:29:08 +0000 | [diff] [blame] | 2136 | if (!sctp_verify_ext_param(net, param)) |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 2137 | return SCTP_IERROR_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | break; |
| 2139 | |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 2140 | case SCTP_PARAM_SET_PRIMARY: |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2141 | if (net->sctp.addip_enable) |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 2142 | break; |
| 2143 | goto fallthrough; |
| 2144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
| 2146 | /* Tell the peer, we won't support this param. */ |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2147 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
| 2148 | retval = SCTP_IERROR_ABORT; |
| 2149 | break; |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2152 | if (net->sctp.prsctp_enable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | break; |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2154 | goto fallthrough; |
| 2155 | |
| 2156 | case SCTP_PARAM_RANDOM: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2157 | if (!ep->auth_enable) |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2158 | goto fallthrough; |
| 2159 | |
| 2160 | /* SCTP-AUTH: Secion 6.1 |
| 2161 | * If the random number is not 32 byte long the association |
| 2162 | * MUST be aborted. The ABORT chunk SHOULD contain the error |
| 2163 | * cause 'Protocol Violation'. |
| 2164 | */ |
| 2165 | if (SCTP_AUTH_RANDOM_LENGTH != |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2166 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { |
| 2167 | sctp_process_inv_paramlength(asoc, param.p, |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2168 | chunk, err_chunk); |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2169 | retval = SCTP_IERROR_ABORT; |
| 2170 | } |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2171 | break; |
| 2172 | |
| 2173 | case SCTP_PARAM_CHUNKS: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2174 | if (!ep->auth_enable) |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2175 | goto fallthrough; |
| 2176 | |
| 2177 | /* SCTP-AUTH: Section 3.2 |
| 2178 | * The CHUNKS parameter MUST be included once in the INIT or |
| 2179 | * INIT-ACK chunk if the sender wants to receive authenticated |
| 2180 | * chunks. Its maximum length is 260 bytes. |
| 2181 | */ |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2182 | if (260 < ntohs(param.p->length)) { |
| 2183 | sctp_process_inv_paramlength(asoc, param.p, |
| 2184 | chunk, err_chunk); |
| 2185 | retval = SCTP_IERROR_ABORT; |
| 2186 | } |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2187 | break; |
| 2188 | |
| 2189 | case SCTP_PARAM_HMAC_ALGO: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2190 | if (!ep->auth_enable) |
Wei Yongjun | 72da7b3 | 2008-04-12 18:39:19 -0700 | [diff] [blame] | 2191 | goto fallthrough; |
| 2192 | |
| 2193 | hmacs = (struct sctp_hmac_algo_param *)param.p; |
| 2194 | n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; |
| 2195 | |
| 2196 | /* SCTP-AUTH: Section 6.1 |
| 2197 | * The HMAC algorithm based on SHA-1 MUST be supported and |
| 2198 | * included in the HMAC-ALGO parameter. |
| 2199 | */ |
| 2200 | for (i = 0; i < n_elt; i++) { |
| 2201 | id = ntohs(hmacs->hmac_ids[i]); |
| 2202 | |
| 2203 | if (id == SCTP_AUTH_HMAC_ID_SHA1) |
| 2204 | break; |
| 2205 | } |
| 2206 | |
| 2207 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { |
| 2208 | sctp_process_inv_paramlength(asoc, param.p, chunk, |
| 2209 | err_chunk); |
| 2210 | retval = SCTP_IERROR_ABORT; |
| 2211 | } |
| 2212 | break; |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2213 | fallthrough: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | default: |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 2215 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
| 2216 | __func__, ntohs(param.p->type), cid); |
| 2217 | |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2218 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | break; |
| 2220 | } |
| 2221 | return retval; |
| 2222 | } |
| 2223 | |
| 2224 | /* Verify the INIT packet before we process it. */ |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2225 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
| 2226 | const struct sctp_association *asoc, sctp_cid_t cid, |
| 2227 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | struct sctp_chunk **errp) |
| 2229 | { |
| 2230 | union sctp_params param; |
Daniel Borkmann | 7613f5f | 2013-08-27 16:53:52 +0200 | [diff] [blame] | 2231 | bool has_cookie = false; |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2232 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | |
Daniel Borkmann | 7613f5f | 2013-08-27 16:53:52 +0200 | [diff] [blame] | 2234 | /* Check for missing mandatory parameters. Note: Initial TSN is |
| 2235 | * also mandatory, but is not checked here since the valid range |
| 2236 | * is 0..2**32-1. RFC4960, section 3.3.3. |
| 2237 | */ |
| 2238 | if (peer_init->init_hdr.num_outbound_streams == 0 || |
| 2239 | peer_init->init_hdr.num_inbound_streams == 0 || |
| 2240 | peer_init->init_hdr.init_tag == 0 || |
| 2241 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2242 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | sctp_walk_params(param, peer_init, init_hdr.params) { |
Daniel Borkmann | 7613f5f | 2013-08-27 16:53:52 +0200 | [diff] [blame] | 2245 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
| 2246 | has_cookie = true; |
| 2247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | |
| 2249 | /* There is a possibility that a parameter length was bad and |
| 2250 | * in that case we would have stoped walking the parameters. |
| 2251 | * The current param.p would point at the bad one. |
| 2252 | * Current consensus on the mailing list is to generate a PROTOCOL |
| 2253 | * VIOLATION error. We build the ERROR chunk here and let the normal |
| 2254 | * error handling code build and send the packet. |
| 2255 | */ |
wangweidong | 26ac8e5 | 2013-12-23 12:16:51 +0800 | [diff] [blame] | 2256 | if (param.v != (void *)chunk->chunk_end) |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2257 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | |
| 2259 | /* The only missing mandatory param possible today is |
| 2260 | * the state cookie for an INIT-ACK chunk. |
| 2261 | */ |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2262 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
| 2263 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, |
| 2264 | chunk, errp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2266 | /* Verify all the variable length parameters */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | sctp_walk_params(param, peer_init, init_hdr.params) { |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2268 | result = sctp_verify_param(net, ep, asoc, param, cid, |
| 2269 | chunk, errp); |
Vlad Yasevich | 7ab9080 | 2007-11-09 11:43:41 -0500 | [diff] [blame] | 2270 | switch (result) { |
wangweidong | f7010e6 | 2013-12-23 12:16:52 +0800 | [diff] [blame] | 2271 | case SCTP_IERROR_ABORT: |
| 2272 | case SCTP_IERROR_NOMEM: |
| 2273 | return 0; |
| 2274 | case SCTP_IERROR_ERROR: |
| 2275 | return 1; |
| 2276 | case SCTP_IERROR_NO_ERROR: |
| 2277 | default: |
| 2278 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | } |
| 2280 | |
| 2281 | } /* for (loop through all parameters) */ |
| 2282 | |
| 2283 | return 1; |
| 2284 | } |
| 2285 | |
| 2286 | /* Unpack the parameters in an INIT packet into an association. |
| 2287 | * Returns 0 on failure, else success. |
| 2288 | * FIXME: This is an association method. |
| 2289 | */ |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2290 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | const union sctp_addr *peer_addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 2292 | sctp_init_chunk_t *peer_init, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | { |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2294 | struct net *net = sock_net(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | union sctp_params param; |
| 2296 | struct sctp_transport *transport; |
| 2297 | struct list_head *pos, *temp; |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2298 | struct sctp_af *af; |
| 2299 | union sctp_addr addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | char *cookie; |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2301 | int src_match = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | |
| 2303 | /* We must include the address that the INIT packet came from. |
| 2304 | * This is the only address that matters for an INIT packet. |
| 2305 | * When processing a COOKIE ECHO, we retrieve the from address |
| 2306 | * of the INIT from the cookie. |
| 2307 | */ |
| 2308 | |
| 2309 | /* This implementation defaults to making the first transport |
| 2310 | * added as the primary transport. The source address seems to |
| 2311 | * be a a better choice than any of the embedded addresses. |
| 2312 | */ |
wangweidong | cb3f837 | 2013-12-23 12:16:50 +0800 | [diff] [blame] | 2313 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2314 | goto nomem; |
| 2315 | |
| 2316 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) |
| 2317 | src_match = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
| 2319 | /* Process the initialization parameters. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | sctp_walk_params(param, peer_init, init_hdr.params) { |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2321 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
| 2322 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { |
| 2323 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
| 2324 | af->from_addr_param(&addr, param.addr, |
| 2325 | chunk->sctp_hdr->source, 0); |
| 2326 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) |
| 2327 | src_match = 1; |
| 2328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | |
| 2330 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2331 | goto clean_up; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | } |
| 2333 | |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 2334 | /* source address of chunk may not match any valid address */ |
| 2335 | if (!src_match) |
| 2336 | goto clean_up; |
| 2337 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2338 | /* AUTH: After processing the parameters, make sure that we |
| 2339 | * have all the required info to potentially do authentications. |
| 2340 | */ |
| 2341 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || |
| 2342 | !asoc->peer.peer_hmacs)) |
| 2343 | asoc->peer.auth_capable = 0; |
| 2344 | |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 2345 | /* In a non-backward compatible mode, if the peer claims |
| 2346 | * support for ADD-IP but not AUTH, the ADD-IP spec states |
| 2347 | * that we MUST ABORT the association. Section 6. The section |
| 2348 | * also give us an option to silently ignore the packet, which |
| 2349 | * is what we'll do here. |
Vlad Yasevich | 6b2f9cb | 2007-09-16 19:35:39 -0700 | [diff] [blame] | 2350 | */ |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2351 | if (!net->sctp.addip_noauth && |
Vlad Yasevich | 73d9c4f | 2007-10-24 17:24:26 -0400 | [diff] [blame] | 2352 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
Vlad Yasevich | 6b2f9cb | 2007-09-16 19:35:39 -0700 | [diff] [blame] | 2353 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
| 2354 | SCTP_PARAM_DEL_IP | |
| 2355 | SCTP_PARAM_SET_PRIMARY); |
Vlad Yasevich | 88799fe | 2007-10-24 17:24:23 -0400 | [diff] [blame] | 2356 | asoc->peer.asconf_capable = 0; |
Vlad Yasevich | d670119 | 2007-12-20 14:13:31 -0800 | [diff] [blame] | 2357 | goto clean_up; |
Vlad Yasevich | 6b2f9cb | 2007-09-16 19:35:39 -0700 | [diff] [blame] | 2358 | } |
| 2359 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 2360 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
| 2361 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 2362 | transport = list_entry(pos, struct sctp_transport, transports); |
| 2363 | if (transport->state == SCTP_UNKNOWN) { |
| 2364 | sctp_assoc_rm_peer(asoc, transport); |
| 2365 | } |
| 2366 | } |
| 2367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | /* The fixed INIT headers are always in network byte |
| 2369 | * order. |
| 2370 | */ |
| 2371 | asoc->peer.i.init_tag = |
| 2372 | ntohl(peer_init->init_hdr.init_tag); |
| 2373 | asoc->peer.i.a_rwnd = |
| 2374 | ntohl(peer_init->init_hdr.a_rwnd); |
| 2375 | asoc->peer.i.num_outbound_streams = |
| 2376 | ntohs(peer_init->init_hdr.num_outbound_streams); |
| 2377 | asoc->peer.i.num_inbound_streams = |
| 2378 | ntohs(peer_init->init_hdr.num_inbound_streams); |
| 2379 | asoc->peer.i.initial_tsn = |
| 2380 | ntohl(peer_init->init_hdr.initial_tsn); |
| 2381 | |
| 2382 | /* Apply the upper bounds for output streams based on peer's |
| 2383 | * number of inbound streams. |
| 2384 | */ |
| 2385 | if (asoc->c.sinit_num_ostreams > |
| 2386 | ntohs(peer_init->init_hdr.num_inbound_streams)) { |
| 2387 | asoc->c.sinit_num_ostreams = |
| 2388 | ntohs(peer_init->init_hdr.num_inbound_streams); |
| 2389 | } |
| 2390 | |
| 2391 | if (asoc->c.sinit_max_instreams > |
| 2392 | ntohs(peer_init->init_hdr.num_outbound_streams)) { |
| 2393 | asoc->c.sinit_max_instreams = |
| 2394 | ntohs(peer_init->init_hdr.num_outbound_streams); |
| 2395 | } |
| 2396 | |
| 2397 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ |
| 2398 | asoc->c.peer_vtag = asoc->peer.i.init_tag; |
| 2399 | |
| 2400 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ |
| 2401 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; |
| 2402 | |
| 2403 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ |
| 2404 | cookie = asoc->peer.cookie; |
| 2405 | if (cookie) { |
Arnaldo Carvalho de Melo | af997d8 | 2006-11-21 01:20:33 -0200 | [diff] [blame] | 2406 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | if (!asoc->peer.cookie) |
| 2408 | goto clean_up; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2409 | } |
| 2410 | |
| 2411 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily |
| 2412 | * high (for example, implementations MAY use the size of the receiver |
| 2413 | * advertised window). |
| 2414 | */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 2415 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
| 2416 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | transport->ssthresh = asoc->peer.i.a_rwnd; |
| 2418 | } |
| 2419 | |
| 2420 | /* Set up the TSN tracking pieces. */ |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 2421 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
| 2422 | asoc->peer.i.initial_tsn, gfp)) |
| 2423 | goto clean_up; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | |
| 2425 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number |
| 2426 | * |
| 2427 | * The stream sequence number in all the streams shall start |
| 2428 | * from 0 when the association is established. Also, when the |
| 2429 | * stream sequence number reaches the value 65535 the next |
| 2430 | * stream sequence number shall be set to 0. |
| 2431 | */ |
| 2432 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 2433 | /* Allocate storage for the negotiated streams if it is not a temporary |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2434 | * association. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | */ |
| 2436 | if (!asoc->temp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | int error; |
| 2438 | |
| 2439 | asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, |
| 2440 | asoc->c.sinit_num_ostreams, gfp); |
| 2441 | if (!asoc->ssnmap) |
| 2442 | goto clean_up; |
| 2443 | |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 2444 | error = sctp_assoc_set_id(asoc, gfp); |
| 2445 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | goto clean_up; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | } |
| 2448 | |
| 2449 | /* ADDIP Section 4.1 ASCONF Chunk Procedures |
| 2450 | * |
| 2451 | * When an endpoint has an ASCONF signaled change to be sent to the |
| 2452 | * remote endpoint it should do the following: |
| 2453 | * ... |
| 2454 | * A2) A serial number should be assigned to the Chunk. The serial |
| 2455 | * number should be a monotonically increasing number. All serial |
| 2456 | * numbers are defined to be initialized at the start of the |
| 2457 | * association to the same value as the Initial TSN. |
| 2458 | */ |
| 2459 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; |
| 2460 | return 1; |
| 2461 | |
| 2462 | clean_up: |
| 2463 | /* Release the transport structures. */ |
| 2464 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 2465 | transport = list_entry(pos, struct sctp_transport, transports); |
Vlad Yasevich | add5237 | 2008-09-18 16:28:27 -0700 | [diff] [blame] | 2466 | if (transport->state != SCTP_ACTIVE) |
| 2467 | sctp_assoc_rm_peer(asoc, transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | } |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 2469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | nomem: |
| 2471 | return 0; |
| 2472 | } |
| 2473 | |
| 2474 | |
| 2475 | /* Update asoc with the option described in param. |
| 2476 | * |
| 2477 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT |
| 2478 | * |
| 2479 | * asoc is the association to update. |
| 2480 | * param is the variable length parameter to use for update. |
| 2481 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. |
| 2482 | * If the current packet is an INIT we want to minimize the amount of |
| 2483 | * work we do. In particular, we should not build transport |
| 2484 | * structures for the addresses. |
| 2485 | */ |
| 2486 | static int sctp_process_param(struct sctp_association *asoc, |
| 2487 | union sctp_params param, |
| 2488 | const union sctp_addr *peer_addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 2489 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | { |
Eric W. Biederman | e7ff4a7 | 2012-08-07 07:27:02 +0000 | [diff] [blame] | 2491 | struct net *net = sock_net(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | union sctp_addr addr; |
| 2493 | int i; |
| 2494 | __u16 sat; |
| 2495 | int retval = 1; |
| 2496 | sctp_scope_t scope; |
| 2497 | time_t stale; |
| 2498 | struct sctp_af *af; |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 2499 | union sctp_addr_param *addr_param; |
| 2500 | struct sctp_transport *t; |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2501 | struct sctp_endpoint *ep = asoc->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | |
| 2503 | /* We maintain all INIT parameters in network byte order all the |
| 2504 | * time. This allows us to not worry about whether the parameters |
| 2505 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. |
| 2506 | */ |
| 2507 | switch (param.p->type) { |
| 2508 | case SCTP_PARAM_IPV6_ADDRESS: |
| 2509 | if (PF_INET6 != asoc->base.sk->sk_family) |
| 2510 | break; |
Vlad Yasevich | 7dab83d | 2008-07-18 23:05:40 -0700 | [diff] [blame] | 2511 | goto do_addr_param; |
| 2512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | case SCTP_PARAM_IPV4_ADDRESS: |
Vlad Yasevich | 7dab83d | 2008-07-18 23:05:40 -0700 | [diff] [blame] | 2514 | /* v4 addresses are not allowed on v6-only socket */ |
| 2515 | if (ipv6_only_sock(asoc->base.sk)) |
| 2516 | break; |
| 2517 | do_addr_param: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 2519 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2520 | scope = sctp_scope(peer_addr); |
Eric W. Biederman | e7ff4a7 | 2012-08-07 07:27:02 +0000 | [diff] [blame] | 2521 | if (sctp_in_scope(net, &addr, scope)) |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 2522 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2523 | return 0; |
| 2524 | break; |
| 2525 | |
| 2526 | case SCTP_PARAM_COOKIE_PRESERVATIVE: |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2527 | if (!net->sctp.cookie_preserve_enable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | break; |
| 2529 | |
| 2530 | stale = ntohl(param.life->lifespan_increment); |
| 2531 | |
| 2532 | /* Suggested Cookie Life span increment's unit is msec, |
| 2533 | * (1/1000sec). |
| 2534 | */ |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 2535 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | break; |
| 2537 | |
| 2538 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 2539 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | break; |
| 2541 | |
| 2542 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: |
| 2543 | /* Turn off the default values first so we'll know which |
| 2544 | * ones are really set by the peer. |
| 2545 | */ |
| 2546 | asoc->peer.ipv4_address = 0; |
| 2547 | asoc->peer.ipv6_address = 0; |
| 2548 | |
Gui Jianfeng | 140ee96 | 2008-03-05 13:43:32 -0800 | [diff] [blame] | 2549 | /* Assume that peer supports the address family |
| 2550 | * by which it sends a packet. |
| 2551 | */ |
| 2552 | if (peer_addr->sa.sa_family == AF_INET6) |
| 2553 | asoc->peer.ipv6_address = 1; |
| 2554 | else if (peer_addr->sa.sa_family == AF_INET) |
| 2555 | asoc->peer.ipv4_address = 1; |
| 2556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2557 | /* Cycle through address types; avoid divide by 0. */ |
| 2558 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
| 2559 | if (sat) |
| 2560 | sat /= sizeof(__u16); |
| 2561 | |
| 2562 | for (i = 0; i < sat; ++i) { |
| 2563 | switch (param.sat->types[i]) { |
| 2564 | case SCTP_PARAM_IPV4_ADDRESS: |
| 2565 | asoc->peer.ipv4_address = 1; |
| 2566 | break; |
| 2567 | |
| 2568 | case SCTP_PARAM_IPV6_ADDRESS: |
Wei Yongjun | 6e40a91 | 2008-05-09 15:11:17 -0700 | [diff] [blame] | 2569 | if (PF_INET6 == asoc->base.sk->sk_family) |
| 2570 | asoc->peer.ipv6_address = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2571 | break; |
| 2572 | |
| 2573 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
| 2574 | asoc->peer.hostname_address = 1; |
| 2575 | break; |
| 2576 | |
| 2577 | default: /* Just ignore anything else. */ |
| 2578 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2579 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | } |
| 2581 | break; |
| 2582 | |
| 2583 | case SCTP_PARAM_STATE_COOKIE: |
| 2584 | asoc->peer.cookie_len = |
| 2585 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
| 2586 | asoc->peer.cookie = param.cookie->body; |
| 2587 | break; |
| 2588 | |
| 2589 | case SCTP_PARAM_HEARTBEAT_INFO: |
| 2590 | /* Would be odd to receive, but it causes no problems. */ |
| 2591 | break; |
| 2592 | |
| 2593 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: |
| 2594 | /* Rejected during verify stage. */ |
| 2595 | break; |
| 2596 | |
| 2597 | case SCTP_PARAM_ECN_CAPABLE: |
| 2598 | asoc->peer.ecn_capable = 1; |
| 2599 | break; |
| 2600 | |
Ivan Skytte Jorgensen | 0f3fffd | 2006-12-20 16:07:04 -0800 | [diff] [blame] | 2601 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
Vlad Yasevich | e69c4e0 | 2008-09-15 16:29:49 -0400 | [diff] [blame] | 2602 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | break; |
| 2604 | |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 2605 | case SCTP_PARAM_SET_PRIMARY: |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2606 | if (!net->sctp.addip_enable) |
Vlad Yasevich | 0ef46e2 | 2008-09-18 16:27:38 -0700 | [diff] [blame] | 2607 | goto fall_through; |
| 2608 | |
Vlad Yasevich | d6de309 | 2007-12-20 14:10:00 -0800 | [diff] [blame] | 2609 | addr_param = param.v + sizeof(sctp_addip_param_t); |
| 2610 | |
| 2611 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
| 2612 | af->from_addr_param(&addr, addr_param, |
| 2613 | htons(asoc->peer.port), 0); |
| 2614 | |
| 2615 | /* if the address is invalid, we can't process it. |
| 2616 | * XXX: see spec for what to do. |
| 2617 | */ |
| 2618 | if (!af->addr_valid(&addr, NULL, NULL)) |
| 2619 | break; |
| 2620 | |
| 2621 | t = sctp_assoc_lookup_paddr(asoc, &addr); |
| 2622 | if (!t) |
| 2623 | break; |
| 2624 | |
| 2625 | sctp_assoc_set_primary(asoc, t); |
| 2626 | break; |
| 2627 | |
Vlad Yasevich | 131a47e | 2007-09-16 15:53:56 -0700 | [diff] [blame] | 2628 | case SCTP_PARAM_SUPPORTED_EXT: |
| 2629 | sctp_process_ext_param(asoc, param); |
| 2630 | break; |
| 2631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 2633 | if (net->sctp.prsctp_enable) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2634 | asoc->peer.prsctp_capable = 1; |
| 2635 | break; |
| 2636 | } |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2637 | /* Fall Through */ |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2638 | goto fall_through; |
| 2639 | |
| 2640 | case SCTP_PARAM_RANDOM: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2641 | if (!ep->auth_enable) |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2642 | goto fall_through; |
| 2643 | |
| 2644 | /* Save peer's random parameter */ |
| 2645 | asoc->peer.peer_random = kmemdup(param.p, |
| 2646 | ntohs(param.p->length), gfp); |
| 2647 | if (!asoc->peer.peer_random) { |
| 2648 | retval = 0; |
| 2649 | break; |
| 2650 | } |
| 2651 | break; |
| 2652 | |
| 2653 | case SCTP_PARAM_HMAC_ALGO: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2654 | if (!ep->auth_enable) |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2655 | goto fall_through; |
| 2656 | |
| 2657 | /* Save peer's HMAC list */ |
| 2658 | asoc->peer.peer_hmacs = kmemdup(param.p, |
| 2659 | ntohs(param.p->length), gfp); |
| 2660 | if (!asoc->peer.peer_hmacs) { |
| 2661 | retval = 0; |
| 2662 | break; |
| 2663 | } |
| 2664 | |
| 2665 | /* Set the default HMAC the peer requested*/ |
| 2666 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); |
| 2667 | break; |
| 2668 | |
| 2669 | case SCTP_PARAM_CHUNKS: |
Vlad Yasevich | b14878c | 2014-04-17 17:26:50 +0200 | [diff] [blame] | 2670 | if (!ep->auth_enable) |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 2671 | goto fall_through; |
| 2672 | |
| 2673 | asoc->peer.peer_chunks = kmemdup(param.p, |
| 2674 | ntohs(param.p->length), gfp); |
| 2675 | if (!asoc->peer.peer_chunks) |
| 2676 | retval = 0; |
| 2677 | break; |
| 2678 | fall_through: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | default: |
| 2680 | /* Any unrecognized parameters should have been caught |
| 2681 | * and handled by sctp_verify_param() which should be |
| 2682 | * called prior to this routine. Simply log the error |
| 2683 | * here. |
| 2684 | */ |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 2685 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
| 2686 | __func__, ntohs(param.p->type), asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2687 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2689 | |
| 2690 | return retval; |
| 2691 | } |
| 2692 | |
| 2693 | /* Select a new verification tag. */ |
| 2694 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) |
| 2695 | { |
| 2696 | /* I believe that this random number generator complies with RFC1750. |
| 2697 | * A tag of 0 is reserved for special cases (e.g. INIT). |
| 2698 | */ |
| 2699 | __u32 x; |
| 2700 | |
| 2701 | do { |
| 2702 | get_random_bytes(&x, sizeof(__u32)); |
| 2703 | } while (x == 0); |
| 2704 | |
| 2705 | return x; |
| 2706 | } |
| 2707 | |
| 2708 | /* Select an initial TSN to send during startup. */ |
| 2709 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) |
| 2710 | { |
| 2711 | __u32 retval; |
| 2712 | |
| 2713 | get_random_bytes(&retval, sizeof(__u32)); |
| 2714 | return retval; |
| 2715 | } |
| 2716 | |
| 2717 | /* |
| 2718 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) |
| 2719 | * 0 1 2 3 |
| 2720 | * 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 |
| 2721 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2722 | * | Type = 0xC1 | Chunk Flags | Chunk Length | |
| 2723 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2724 | * | Serial Number | |
| 2725 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2726 | * | Address Parameter | |
| 2727 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2728 | * | ASCONF Parameter #1 | |
| 2729 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2730 | * \ \ |
| 2731 | * / .... / |
| 2732 | * \ \ |
| 2733 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2734 | * | ASCONF Parameter #N | |
| 2735 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2736 | * |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2737 | * Address Parameter and other parameter will not be wrapped in this function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2738 | */ |
| 2739 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, |
| 2740 | union sctp_addr *addr, |
| 2741 | int vparam_len) |
| 2742 | { |
| 2743 | sctp_addiphdr_t asconf; |
| 2744 | struct sctp_chunk *retval; |
| 2745 | int length = sizeof(asconf) + vparam_len; |
| 2746 | union sctp_addr_param addrparam; |
| 2747 | int addrlen; |
| 2748 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
| 2749 | |
| 2750 | addrlen = af->to_addr_param(addr, &addrparam); |
| 2751 | if (!addrlen) |
| 2752 | return NULL; |
| 2753 | length += addrlen; |
| 2754 | |
| 2755 | /* Create the chunk. */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 2756 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2757 | if (!retval) |
| 2758 | return NULL; |
| 2759 | |
| 2760 | asconf.serial = htonl(asoc->addip_serial++); |
| 2761 | |
| 2762 | retval->subh.addip_hdr = |
| 2763 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); |
| 2764 | retval->param_hdr.v = |
| 2765 | sctp_addto_chunk(retval, addrlen, &addrparam); |
| 2766 | |
| 2767 | return retval; |
| 2768 | } |
| 2769 | |
| 2770 | /* ADDIP |
| 2771 | * 3.2.1 Add IP Address |
| 2772 | * 0 1 2 3 |
| 2773 | * 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 |
| 2774 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2775 | * | Type = 0xC001 | Length = Variable | |
| 2776 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2777 | * | ASCONF-Request Correlation ID | |
| 2778 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2779 | * | Address Parameter | |
| 2780 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2781 | * |
| 2782 | * 3.2.2 Delete IP Address |
| 2783 | * 0 1 2 3 |
| 2784 | * 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 |
| 2785 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2786 | * | Type = 0xC002 | Length = Variable | |
| 2787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2788 | * | ASCONF-Request Correlation ID | |
| 2789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2790 | * | Address Parameter | |
| 2791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2792 | * |
| 2793 | */ |
| 2794 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, |
| 2795 | union sctp_addr *laddr, |
| 2796 | struct sockaddr *addrs, |
| 2797 | int addrcnt, |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 2798 | __be16 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | { |
| 2800 | sctp_addip_param_t param; |
| 2801 | struct sctp_chunk *retval; |
| 2802 | union sctp_addr_param addr_param; |
| 2803 | union sctp_addr *addr; |
| 2804 | void *addr_buf; |
| 2805 | struct sctp_af *af; |
| 2806 | int paramlen = sizeof(param); |
| 2807 | int addr_param_len = 0; |
| 2808 | int totallen = 0; |
| 2809 | int i; |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 2810 | int del_pickup = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | |
| 2812 | /* Get total length of all the address parameters. */ |
| 2813 | addr_buf = addrs; |
| 2814 | for (i = 0; i < addrcnt; i++) { |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 2815 | addr = addr_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2816 | af = sctp_get_af_specific(addr->v4.sin_family); |
| 2817 | addr_param_len = af->to_addr_param(addr, &addr_param); |
| 2818 | |
| 2819 | totallen += paramlen; |
| 2820 | totallen += addr_param_len; |
| 2821 | |
| 2822 | addr_buf += af->sockaddr_len; |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 2823 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
| 2824 | /* reuse the parameter length from the same scope one */ |
| 2825 | totallen += paramlen; |
| 2826 | totallen += addr_param_len; |
| 2827 | del_pickup = 1; |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 2828 | |
| 2829 | pr_debug("%s: picked same-scope del_pending addr, " |
| 2830 | "totallen for all addresses is %d\n", |
| 2831 | __func__, totallen); |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 2832 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | } |
| 2834 | |
| 2835 | /* Create an asconf chunk with the required length. */ |
| 2836 | retval = sctp_make_asconf(asoc, laddr, totallen); |
| 2837 | if (!retval) |
| 2838 | return NULL; |
| 2839 | |
| 2840 | /* Add the address parameters to the asconf chunk. */ |
| 2841 | addr_buf = addrs; |
| 2842 | for (i = 0; i < addrcnt; i++) { |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 2843 | addr = addr_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2844 | af = sctp_get_af_specific(addr->v4.sin_family); |
| 2845 | addr_param_len = af->to_addr_param(addr, &addr_param); |
| 2846 | param.param_hdr.type = flags; |
| 2847 | param.param_hdr.length = htons(paramlen + addr_param_len); |
| 2848 | param.crr_id = i; |
| 2849 | |
| 2850 | sctp_addto_chunk(retval, paramlen, ¶m); |
| 2851 | sctp_addto_chunk(retval, addr_param_len, &addr_param); |
| 2852 | |
| 2853 | addr_buf += af->sockaddr_len; |
| 2854 | } |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 2855 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
| 2856 | addr = asoc->asconf_addr_del_pending; |
| 2857 | af = sctp_get_af_specific(addr->v4.sin_family); |
| 2858 | addr_param_len = af->to_addr_param(addr, &addr_param); |
| 2859 | param.param_hdr.type = SCTP_PARAM_DEL_IP; |
| 2860 | param.param_hdr.length = htons(paramlen + addr_param_len); |
| 2861 | param.crr_id = i; |
| 2862 | |
| 2863 | sctp_addto_chunk(retval, paramlen, ¶m); |
| 2864 | sctp_addto_chunk(retval, addr_param_len, &addr_param); |
| 2865 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | return retval; |
| 2867 | } |
| 2868 | |
| 2869 | /* ADDIP |
| 2870 | * 3.2.4 Set Primary IP Address |
| 2871 | * 0 1 2 3 |
| 2872 | * 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 |
| 2873 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2874 | * | Type =0xC004 | Length = Variable | |
| 2875 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2876 | * | ASCONF-Request Correlation ID | |
| 2877 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2878 | * | Address Parameter | |
| 2879 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2880 | * |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2881 | * Create an ASCONF chunk with Set Primary IP address parameter. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | */ |
| 2883 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, |
| 2884 | union sctp_addr *addr) |
| 2885 | { |
| 2886 | sctp_addip_param_t param; |
| 2887 | struct sctp_chunk *retval; |
| 2888 | int len = sizeof(param); |
| 2889 | union sctp_addr_param addrparam; |
| 2890 | int addrlen; |
| 2891 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
| 2892 | |
| 2893 | addrlen = af->to_addr_param(addr, &addrparam); |
| 2894 | if (!addrlen) |
| 2895 | return NULL; |
| 2896 | len += addrlen; |
| 2897 | |
| 2898 | /* Create the chunk and make asconf header. */ |
| 2899 | retval = sctp_make_asconf(asoc, addr, len); |
| 2900 | if (!retval) |
| 2901 | return NULL; |
| 2902 | |
| 2903 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; |
| 2904 | param.param_hdr.length = htons(len); |
| 2905 | param.crr_id = 0; |
| 2906 | |
| 2907 | sctp_addto_chunk(retval, sizeof(param), ¶m); |
| 2908 | sctp_addto_chunk(retval, addrlen, &addrparam); |
| 2909 | |
| 2910 | return retval; |
| 2911 | } |
| 2912 | |
| 2913 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) |
| 2914 | * 0 1 2 3 |
| 2915 | * 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 |
| 2916 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2917 | * | Type = 0x80 | Chunk Flags | Chunk Length | |
| 2918 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2919 | * | Serial Number | |
| 2920 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2921 | * | ASCONF Parameter Response#1 | |
| 2922 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2923 | * \ \ |
| 2924 | * / .... / |
| 2925 | * \ \ |
| 2926 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2927 | * | ASCONF Parameter Response#N | |
| 2928 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 2929 | * |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2930 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | */ |
| 2932 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, |
| 2933 | __u32 serial, int vparam_len) |
| 2934 | { |
| 2935 | sctp_addiphdr_t asconf; |
| 2936 | struct sctp_chunk *retval; |
| 2937 | int length = sizeof(asconf) + vparam_len; |
| 2938 | |
| 2939 | /* Create the chunk. */ |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 2940 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | if (!retval) |
| 2942 | return NULL; |
| 2943 | |
| 2944 | asconf.serial = htonl(serial); |
| 2945 | |
| 2946 | retval->subh.addip_hdr = |
| 2947 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); |
| 2948 | |
| 2949 | return retval; |
| 2950 | } |
| 2951 | |
| 2952 | /* Add response parameters to an ASCONF_ACK chunk. */ |
Al Viro | 9f81bcd | 2006-11-20 17:26:34 -0800 | [diff] [blame] | 2953 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 2954 | __be16 err_code, sctp_addip_param_t *asconf_param) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2955 | { |
| 2956 | sctp_addip_param_t ack_param; |
| 2957 | sctp_errhdr_t err_param; |
| 2958 | int asconf_param_len = 0; |
| 2959 | int err_param_len = 0; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 2960 | __be16 response_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2961 | |
| 2962 | if (SCTP_ERROR_NO_ERROR == err_code) { |
| 2963 | response_type = SCTP_PARAM_SUCCESS_REPORT; |
| 2964 | } else { |
| 2965 | response_type = SCTP_PARAM_ERR_CAUSE; |
| 2966 | err_param_len = sizeof(err_param); |
| 2967 | if (asconf_param) |
| 2968 | asconf_param_len = |
| 2969 | ntohs(asconf_param->param_hdr.length); |
| 2970 | } |
| 2971 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 2972 | /* Add Success Indication or Error Cause Indication parameter. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2973 | ack_param.param_hdr.type = response_type; |
| 2974 | ack_param.param_hdr.length = htons(sizeof(ack_param) + |
| 2975 | err_param_len + |
| 2976 | asconf_param_len); |
| 2977 | ack_param.crr_id = crr_id; |
| 2978 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); |
| 2979 | |
| 2980 | if (SCTP_ERROR_NO_ERROR == err_code) |
| 2981 | return; |
| 2982 | |
| 2983 | /* Add Error Cause parameter. */ |
| 2984 | err_param.cause = err_code; |
| 2985 | err_param.length = htons(err_param_len + asconf_param_len); |
| 2986 | sctp_addto_chunk(chunk, err_param_len, &err_param); |
| 2987 | |
| 2988 | /* Add the failed TLV copied from ASCONF chunk. */ |
| 2989 | if (asconf_param) |
| 2990 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); |
| 2991 | } |
| 2992 | |
| 2993 | /* Process a asconf parameter. */ |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 2994 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | struct sctp_chunk *asconf, |
| 2996 | sctp_addip_param_t *asconf_param) |
| 2997 | { |
| 2998 | struct sctp_transport *peer; |
| 2999 | struct sctp_af *af; |
| 3000 | union sctp_addr addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | union sctp_addr_param *addr_param; |
Al Viro | 5f242a1 | 2006-11-20 17:05:23 -0800 | [diff] [blame] | 3002 | |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3003 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
Patrick McHardy | c1cc678 | 2008-05-13 23:25:00 -0700 | [diff] [blame] | 3004 | |
Wei Yongjun | 44e65c1 | 2009-06-16 14:48:24 +0800 | [diff] [blame] | 3005 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
| 3006 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && |
| 3007 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) |
| 3008 | return SCTP_ERROR_UNKNOWN_PARAM; |
| 3009 | |
Shan Wei | 6a43573 | 2011-04-18 19:11:47 +0000 | [diff] [blame] | 3010 | switch (addr_param->p.type) { |
Wei Yongjun | c449258 | 2008-05-09 15:11:53 -0700 | [diff] [blame] | 3011 | case SCTP_PARAM_IPV6_ADDRESS: |
| 3012 | if (!asoc->peer.ipv6_address) |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3013 | return SCTP_ERROR_DNS_FAILED; |
Wei Yongjun | c449258 | 2008-05-09 15:11:53 -0700 | [diff] [blame] | 3014 | break; |
| 3015 | case SCTP_PARAM_IPV4_ADDRESS: |
| 3016 | if (!asoc->peer.ipv4_address) |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3017 | return SCTP_ERROR_DNS_FAILED; |
Wei Yongjun | c449258 | 2008-05-09 15:11:53 -0700 | [diff] [blame] | 3018 | break; |
| 3019 | default: |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3020 | return SCTP_ERROR_DNS_FAILED; |
Wei Yongjun | c449258 | 2008-05-09 15:11:53 -0700 | [diff] [blame] | 3021 | } |
| 3022 | |
Shan Wei | 6a43573 | 2011-04-18 19:11:47 +0000 | [diff] [blame] | 3023 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3024 | if (unlikely(!af)) |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3025 | return SCTP_ERROR_DNS_FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 3027 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3028 | |
| 3029 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast |
| 3030 | * or multicast address. |
| 3031 | * (note: wildcard is permitted and requires special handling so |
| 3032 | * make sure we check for that) |
| 3033 | */ |
| 3034 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3035 | return SCTP_ERROR_DNS_FAILED; |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | switch (asconf_param->param_hdr.type) { |
| 3038 | case SCTP_PARAM_ADD_IP: |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3039 | /* Section 4.2.1: |
| 3040 | * If the address 0.0.0.0 or ::0 is provided, the source |
| 3041 | * address of the packet MUST be added. |
| 3042 | */ |
| 3043 | if (af->is_any(&addr)) |
| 3044 | memcpy(&addr, &asconf->source, sizeof(addr)); |
| 3045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3047 | * request and does not have the local resources to add this |
| 3048 | * new address to the association, it MUST return an Error |
| 3049 | * Cause TLV set to the new error code 'Operation Refused |
| 3050 | * Due to Resource Shortage'. |
| 3051 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 3053 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3054 | if (!peer) |
| 3055 | return SCTP_ERROR_RSRC_LOW; |
| 3056 | |
| 3057 | /* Start the heartbeat timer. */ |
| 3058 | if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) |
| 3059 | sctp_transport_hold(peer); |
Michio Honda | 6af29cc | 2011-06-16 17:14:34 +0900 | [diff] [blame] | 3060 | asoc->new_transport = peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3061 | break; |
| 3062 | case SCTP_PARAM_DEL_IP: |
| 3063 | /* ADDIP 4.3 D7) If a request is received to delete the |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3064 | * last remaining IP address of a peer endpoint, the receiver |
| 3065 | * MUST send an Error Cause TLV with the error cause set to the |
| 3066 | * new error code 'Request to Delete Last Remaining IP Address'. |
| 3067 | */ |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3068 | if (asoc->peer.transport_count == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | return SCTP_ERROR_DEL_LAST_IP; |
| 3070 | |
| 3071 | /* ADDIP 4.3 D8) If a request is received to delete an IP |
| 3072 | * address which is also the source address of the IP packet |
| 3073 | * which contained the ASCONF chunk, the receiver MUST reject |
| 3074 | * this request. To reject the request the receiver MUST send |
| 3075 | * an Error Cause TLV set to the new error code 'Request to |
| 3076 | * Delete Source IP Address' |
| 3077 | */ |
Michio Honda | b136410 | 2011-04-26 17:37:02 +0900 | [diff] [blame] | 3078 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | return SCTP_ERROR_DEL_SRC_IP; |
| 3080 | |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3081 | /* Section 4.2.2 |
| 3082 | * If the address 0.0.0.0 or ::0 is provided, all |
| 3083 | * addresses of the peer except the source address of the |
| 3084 | * packet MUST be deleted. |
| 3085 | */ |
| 3086 | if (af->is_any(&addr)) { |
| 3087 | sctp_assoc_set_primary(asoc, asconf->transport); |
| 3088 | sctp_assoc_del_nonprimary_peers(asoc, |
| 3089 | asconf->transport); |
| 3090 | } else |
| 3091 | sctp_assoc_del_peer(asoc, &addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3092 | break; |
| 3093 | case SCTP_PARAM_SET_PRIMARY: |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 3094 | /* ADDIP Section 4.2.4 |
| 3095 | * If the address 0.0.0.0 or ::0 is provided, the receiver |
| 3096 | * MAY mark the source address of the packet as its |
| 3097 | * primary. |
| 3098 | */ |
| 3099 | if (af->is_any(&addr)) |
| 3100 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); |
| 3101 | |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 3102 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3103 | if (!peer) |
Wei Yongjun | 945e5ab | 2009-04-16 14:21:02 +0800 | [diff] [blame] | 3104 | return SCTP_ERROR_DNS_FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3105 | |
| 3106 | sctp_assoc_set_primary(asoc, peer); |
| 3107 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3108 | } |
| 3109 | |
| 3110 | return SCTP_ERROR_NO_ERROR; |
| 3111 | } |
| 3112 | |
Wei Yongjun | 6f4c618 | 2007-09-19 17:19:52 +0800 | [diff] [blame] | 3113 | /* Verify the ASCONF packet before we process it. */ |
| 3114 | int sctp_verify_asconf(const struct sctp_association *asoc, |
| 3115 | struct sctp_paramhdr *param_hdr, void *chunk_end, |
| 3116 | struct sctp_paramhdr **errp) { |
| 3117 | sctp_addip_param_t *asconf_param; |
| 3118 | union sctp_params param; |
| 3119 | int length, plen; |
| 3120 | |
| 3121 | param.v = (sctp_paramhdr_t *) param_hdr; |
| 3122 | while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { |
| 3123 | length = ntohs(param.p->length); |
| 3124 | *errp = param.p; |
| 3125 | |
| 3126 | if (param.v > chunk_end - length || |
| 3127 | length < sizeof(sctp_paramhdr_t)) |
| 3128 | return 0; |
| 3129 | |
| 3130 | switch (param.p->type) { |
| 3131 | case SCTP_PARAM_ADD_IP: |
| 3132 | case SCTP_PARAM_DEL_IP: |
| 3133 | case SCTP_PARAM_SET_PRIMARY: |
| 3134 | asconf_param = (sctp_addip_param_t *)param.v; |
| 3135 | plen = ntohs(asconf_param->param_hdr.length); |
| 3136 | if (plen < sizeof(sctp_addip_param_t) + |
| 3137 | sizeof(sctp_paramhdr_t)) |
| 3138 | return 0; |
| 3139 | break; |
| 3140 | case SCTP_PARAM_SUCCESS_REPORT: |
| 3141 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
| 3142 | if (length != sizeof(sctp_addip_param_t)) |
| 3143 | return 0; |
| 3144 | |
| 3145 | break; |
| 3146 | default: |
| 3147 | break; |
| 3148 | } |
| 3149 | |
| 3150 | param.v += WORD_ROUND(length); |
| 3151 | } |
| 3152 | |
| 3153 | if (param.v != chunk_end) |
| 3154 | return 0; |
| 3155 | |
| 3156 | return 1; |
| 3157 | } |
| 3158 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3159 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | * return an ASCONF_ACK chunk to be sent in response. |
| 3161 | */ |
| 3162 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, |
| 3163 | struct sctp_chunk *asconf) |
| 3164 | { |
| 3165 | sctp_addiphdr_t *hdr; |
| 3166 | union sctp_addr_param *addr_param; |
| 3167 | sctp_addip_param_t *asconf_param; |
| 3168 | struct sctp_chunk *asconf_ack; |
| 3169 | |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 3170 | __be16 err_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3171 | int length = 0; |
Wei Yongjun | f3830cc | 2007-10-15 11:51:03 +0900 | [diff] [blame] | 3172 | int chunk_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3173 | __u32 serial; |
| 3174 | int all_param_pass = 1; |
| 3175 | |
Wei Yongjun | f3830cc | 2007-10-15 11:51:03 +0900 | [diff] [blame] | 3176 | chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | hdr = (sctp_addiphdr_t *)asconf->skb->data; |
| 3178 | serial = ntohl(hdr->serial); |
| 3179 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3180 | /* Skip the addiphdr and store a pointer to address parameter. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3181 | length = sizeof(sctp_addiphdr_t); |
| 3182 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
| 3183 | chunk_len -= length; |
| 3184 | |
| 3185 | /* Skip the address parameter and store a pointer to the first |
Joe Perches | 7aa1b54 | 2007-12-20 14:03:52 -0800 | [diff] [blame] | 3186 | * asconf parameter. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3187 | */ |
Shan Wei | 6a43573 | 2011-04-18 19:11:47 +0000 | [diff] [blame] | 3188 | length = ntohs(addr_param->p.length); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3189 | asconf_param = (void *)addr_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3190 | chunk_len -= length; |
| 3191 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3192 | /* create an ASCONF_ACK chunk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3193 | * Based on the definitions of parameters, we know that the size of |
Wei Yongjun | 2cab86b | 2011-03-31 23:42:55 +0000 | [diff] [blame] | 3194 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
Joe Perches | 7aa1b54 | 2007-12-20 14:03:52 -0800 | [diff] [blame] | 3195 | * parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3196 | */ |
Wei Yongjun | 2cab86b | 2011-03-31 23:42:55 +0000 | [diff] [blame] | 3197 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3198 | if (!asconf_ack) |
| 3199 | goto done; |
| 3200 | |
| 3201 | /* Process the TLVs contained within the ASCONF chunk. */ |
| 3202 | while (chunk_len > 0) { |
| 3203 | err_code = sctp_process_asconf_param(asoc, asconf, |
| 3204 | asconf_param); |
| 3205 | /* ADDIP 4.1 A7) |
| 3206 | * If an error response is received for a TLV parameter, |
| 3207 | * all TLVs with no response before the failed TLV are |
| 3208 | * considered successful if not reported. All TLVs after |
| 3209 | * the failed response are considered unsuccessful unless |
| 3210 | * a specific success indication is present for the parameter. |
| 3211 | */ |
| 3212 | if (SCTP_ERROR_NO_ERROR != err_code) |
| 3213 | all_param_pass = 0; |
| 3214 | |
| 3215 | if (!all_param_pass) |
| 3216 | sctp_add_asconf_response(asconf_ack, |
| 3217 | asconf_param->crr_id, err_code, |
| 3218 | asconf_param); |
| 3219 | |
| 3220 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add |
| 3221 | * an IP address sends an 'Out of Resource' in its response, it |
| 3222 | * MUST also fail any subsequent add or delete requests bundled |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3223 | * in the ASCONF. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | */ |
| 3225 | if (SCTP_ERROR_RSRC_LOW == err_code) |
| 3226 | goto done; |
| 3227 | |
| 3228 | /* Move to the next ASCONF param. */ |
| 3229 | length = ntohs(asconf_param->param_hdr.length); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3230 | asconf_param = (void *)asconf_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3231 | chunk_len -= length; |
| 3232 | } |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3234 | done: |
| 3235 | asoc->peer.addip_serial++; |
| 3236 | |
| 3237 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3238 | * after freeing the reference to old asconf ack if any. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3239 | */ |
| 3240 | if (asconf_ack) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3241 | sctp_chunk_hold(asconf_ack); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 3242 | list_add_tail(&asconf_ack->transmitted_list, |
| 3243 | &asoc->asconf_ack_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3244 | } |
| 3245 | |
| 3246 | return asconf_ack; |
| 3247 | } |
| 3248 | |
| 3249 | /* Process a asconf parameter that is successfully acked. */ |
Wei Yongjun | 425e0f6 | 2009-06-16 14:47:30 +0800 | [diff] [blame] | 3250 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3251 | sctp_addip_param_t *asconf_param) |
| 3252 | { |
| 3253 | struct sctp_af *af; |
| 3254 | union sctp_addr addr; |
| 3255 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
| 3256 | union sctp_addr_param *addr_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3257 | struct sctp_transport *transport; |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 3258 | struct sctp_sockaddr_entry *saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3259 | |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3260 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3261 | |
| 3262 | /* We have checked the packet before, so we do not check again. */ |
Shan Wei | 6a43573 | 2011-04-18 19:11:47 +0000 | [diff] [blame] | 3263 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 3264 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | |
| 3266 | switch (asconf_param->param_hdr.type) { |
| 3267 | case SCTP_PARAM_ADD_IP: |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 3268 | /* This is always done in BH context with a socket lock |
| 3269 | * held, so the list can not change. |
| 3270 | */ |
Vlad Yasevich | 0ed90fb | 2007-10-24 16:10:00 -0400 | [diff] [blame] | 3271 | local_bh_disable(); |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 3272 | list_for_each_entry(saddr, &bp->address_list, list) { |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 3273 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
Vlad Yasevich | f57d96b | 2007-12-20 14:12:24 -0800 | [diff] [blame] | 3274 | saddr->state = SCTP_ADDR_SRC; |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 3275 | } |
Vlad Yasevich | 0ed90fb | 2007-10-24 16:10:00 -0400 | [diff] [blame] | 3276 | local_bh_enable(); |
Wei Yongjun | 3cd9749 | 2009-06-16 10:07:23 +0800 | [diff] [blame] | 3277 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
| 3278 | transports) { |
Wei Yongjun | 3cd9749 | 2009-06-16 10:07:23 +0800 | [diff] [blame] | 3279 | dst_release(transport->dst); |
Vlad Yasevich | c6ef006 | 2011-04-18 19:15:22 +0000 | [diff] [blame] | 3280 | transport->dst = NULL; |
Wei Yongjun | 3cd9749 | 2009-06-16 10:07:23 +0800 | [diff] [blame] | 3281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3282 | break; |
| 3283 | case SCTP_PARAM_DEL_IP: |
Vlad Yasevich | 0ed90fb | 2007-10-24 16:10:00 -0400 | [diff] [blame] | 3284 | local_bh_disable(); |
Wei Yongjun | 425e0f6 | 2009-06-16 14:47:30 +0800 | [diff] [blame] | 3285 | sctp_del_bind_addr(bp, &addr); |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 3286 | if (asoc->asconf_addr_del_pending != NULL && |
| 3287 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { |
| 3288 | kfree(asoc->asconf_addr_del_pending); |
| 3289 | asoc->asconf_addr_del_pending = NULL; |
| 3290 | } |
Vlad Yasevich | 0ed90fb | 2007-10-24 16:10:00 -0400 | [diff] [blame] | 3291 | local_bh_enable(); |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 3292 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
| 3293 | transports) { |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 3294 | dst_release(transport->dst); |
Vlad Yasevich | c6ef006 | 2011-04-18 19:15:22 +0000 | [diff] [blame] | 3295 | transport->dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3296 | } |
| 3297 | break; |
| 3298 | default: |
| 3299 | break; |
| 3300 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3301 | } |
| 3302 | |
| 3303 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk |
| 3304 | * for the given asconf parameter. If there is no response for this parameter, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3305 | * return the error code based on the third argument 'no_err'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3306 | * ADDIP 4.1 |
| 3307 | * A7) If an error response is received for a TLV parameter, all TLVs with no |
| 3308 | * response before the failed TLV are considered successful if not reported. |
| 3309 | * All TLVs after the failed response are considered unsuccessful unless a |
| 3310 | * specific success indication is present for the parameter. |
| 3311 | */ |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 3312 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3313 | sctp_addip_param_t *asconf_param, |
| 3314 | int no_err) |
| 3315 | { |
| 3316 | sctp_addip_param_t *asconf_ack_param; |
| 3317 | sctp_errhdr_t *err_param; |
| 3318 | int length; |
Wei Yongjun | f3830cc | 2007-10-15 11:51:03 +0900 | [diff] [blame] | 3319 | int asconf_ack_len; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 3320 | __be16 err_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3321 | |
| 3322 | if (no_err) |
| 3323 | err_code = SCTP_ERROR_NO_ERROR; |
| 3324 | else |
| 3325 | err_code = SCTP_ERROR_REQ_REFUSED; |
| 3326 | |
Wei Yongjun | f3830cc | 2007-10-15 11:51:03 +0900 | [diff] [blame] | 3327 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
| 3328 | sizeof(sctp_chunkhdr_t); |
| 3329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3330 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
| 3331 | * the first asconf_ack parameter. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3332 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3333 | length = sizeof(sctp_addiphdr_t); |
| 3334 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + |
| 3335 | length); |
| 3336 | asconf_ack_len -= length; |
| 3337 | |
| 3338 | while (asconf_ack_len > 0) { |
| 3339 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { |
wangweidong | cb3f837 | 2013-12-23 12:16:50 +0800 | [diff] [blame] | 3340 | switch (asconf_ack_param->param_hdr.type) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3341 | case SCTP_PARAM_SUCCESS_REPORT: |
| 3342 | return SCTP_ERROR_NO_ERROR; |
| 3343 | case SCTP_PARAM_ERR_CAUSE: |
| 3344 | length = sizeof(sctp_addip_param_t); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3345 | err_param = (void *)asconf_ack_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3346 | asconf_ack_len -= length; |
| 3347 | if (asconf_ack_len > 0) |
| 3348 | return err_param->cause; |
| 3349 | else |
| 3350 | return SCTP_ERROR_INV_PARAM; |
| 3351 | break; |
| 3352 | default: |
| 3353 | return SCTP_ERROR_INV_PARAM; |
| 3354 | } |
| 3355 | } |
| 3356 | |
| 3357 | length = ntohs(asconf_ack_param->param_hdr.length); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3358 | asconf_ack_param = (void *)asconf_ack_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3359 | asconf_ack_len -= length; |
| 3360 | } |
| 3361 | |
| 3362 | return err_code; |
| 3363 | } |
| 3364 | |
| 3365 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ |
| 3366 | int sctp_process_asconf_ack(struct sctp_association *asoc, |
| 3367 | struct sctp_chunk *asconf_ack) |
| 3368 | { |
| 3369 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
| 3370 | union sctp_addr_param *addr_param; |
| 3371 | sctp_addip_param_t *asconf_param; |
| 3372 | int length = 0; |
| 3373 | int asconf_len = asconf->skb->len; |
| 3374 | int all_param_pass = 0; |
| 3375 | int no_err = 1; |
| 3376 | int retval = 0; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 3377 | __be16 err_code = SCTP_ERROR_NO_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3378 | |
| 3379 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store |
| 3380 | * a pointer to address parameter. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3381 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3382 | length = sizeof(sctp_addip_chunk_t); |
| 3383 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
| 3384 | asconf_len -= length; |
| 3385 | |
| 3386 | /* Skip the address parameter in the last asconf sent and store a |
Joe Perches | 7aa1b54 | 2007-12-20 14:03:52 -0800 | [diff] [blame] | 3387 | * pointer to the first asconf parameter. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3388 | */ |
Shan Wei | 6a43573 | 2011-04-18 19:11:47 +0000 | [diff] [blame] | 3389 | length = ntohs(addr_param->p.length); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3390 | asconf_param = (void *)addr_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3391 | asconf_len -= length; |
| 3392 | |
| 3393 | /* ADDIP 4.1 |
| 3394 | * A8) If there is no response(s) to specific TLV parameter(s), and no |
| 3395 | * failures are indicated, then all request(s) are considered |
| 3396 | * successful. |
| 3397 | */ |
| 3398 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) |
| 3399 | all_param_pass = 1; |
| 3400 | |
| 3401 | /* Process the TLVs contained in the last sent ASCONF chunk. */ |
| 3402 | while (asconf_len > 0) { |
| 3403 | if (all_param_pass) |
| 3404 | err_code = SCTP_ERROR_NO_ERROR; |
| 3405 | else { |
| 3406 | err_code = sctp_get_asconf_response(asconf_ack, |
| 3407 | asconf_param, |
| 3408 | no_err); |
| 3409 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) |
| 3410 | no_err = 0; |
| 3411 | } |
| 3412 | |
| 3413 | switch (err_code) { |
| 3414 | case SCTP_ERROR_NO_ERROR: |
Wei Yongjun | 425e0f6 | 2009-06-16 14:47:30 +0800 | [diff] [blame] | 3415 | sctp_asconf_param_success(asoc, asconf_param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3416 | break; |
| 3417 | |
| 3418 | case SCTP_ERROR_RSRC_LOW: |
| 3419 | retval = 1; |
| 3420 | break; |
| 3421 | |
Wei Yongjun | a987f76 | 2009-04-07 15:44:29 +0800 | [diff] [blame] | 3422 | case SCTP_ERROR_UNKNOWN_PARAM: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3423 | /* Disable sending this type of asconf parameter in |
| 3424 | * future. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3425 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3426 | asoc->peer.addip_disabled_mask |= |
| 3427 | asconf_param->param_hdr.type; |
| 3428 | break; |
| 3429 | |
| 3430 | case SCTP_ERROR_REQ_REFUSED: |
| 3431 | case SCTP_ERROR_DEL_LAST_IP: |
| 3432 | case SCTP_ERROR_DEL_SRC_IP: |
| 3433 | default: |
| 3434 | break; |
| 3435 | } |
| 3436 | |
| 3437 | /* Skip the processed asconf parameter and move to the next |
| 3438 | * one. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3439 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3440 | length = ntohs(asconf_param->param_hdr.length); |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 3441 | asconf_param = (void *)asconf_param + length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3442 | asconf_len -= length; |
| 3443 | } |
| 3444 | |
Michio Honda | ddc4bbe | 2011-06-17 11:03:23 +0900 | [diff] [blame] | 3445 | if (no_err && asoc->src_out_of_asoc_ok) { |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 3446 | asoc->src_out_of_asoc_ok = 0; |
Michio Honda | ddc4bbe | 2011-06-17 11:03:23 +0900 | [diff] [blame] | 3447 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
| 3448 | } |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 3449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3450 | /* Free the cached last sent asconf chunk. */ |
Vlad Yasevich | 5f9646c | 2008-02-05 14:23:44 -0500 | [diff] [blame] | 3451 | list_del_init(&asconf->transmitted_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3452 | sctp_chunk_free(asconf); |
| 3453 | asoc->addip_last_asconf = NULL; |
| 3454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3455 | return retval; |
| 3456 | } |
| 3457 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3458 | /* Make a FWD TSN chunk. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3459 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
| 3460 | __u32 new_cum_tsn, size_t nstreams, |
| 3461 | struct sctp_fwdtsn_skip *skiplist) |
| 3462 | { |
| 3463 | struct sctp_chunk *retval = NULL; |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 3464 | struct sctp_fwdtsn_hdr ftsn_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3465 | struct sctp_fwdtsn_skip skip; |
| 3466 | size_t hint; |
| 3467 | int i; |
| 3468 | |
| 3469 | hint = (nstreams + 1) * sizeof(__u32); |
| 3470 | |
Vlad Yasevich | 072017b | 2013-08-09 22:05:36 -0400 | [diff] [blame] | 3471 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3472 | |
| 3473 | if (!retval) |
| 3474 | return NULL; |
| 3475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
| 3477 | retval->subh.fwdtsn_hdr = |
| 3478 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); |
| 3479 | |
| 3480 | for (i = 0; i < nstreams; i++) { |
| 3481 | skip.stream = skiplist[i].stream; |
| 3482 | skip.ssn = skiplist[i].ssn; |
| 3483 | sctp_addto_chunk(retval, sizeof(skip), &skip); |
| 3484 | } |
| 3485 | |
| 3486 | return retval; |
| 3487 | } |