linux/include/linux/sctp.h
<<
>>
Prefs
   1/* SCTP kernel reference Implementation
   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 Intel Corp.
   6 * Copyright (c) 2001 Nokia, Inc.
   7 * Copyright (c) 2001 La Monte H.P. Yarroll
   8 *
   9 * This file is part of the SCTP kernel reference Implementation
  10 *
  11 * Various protocol defined structures.
  12 *
  13 * This SCTP implementation is free software;
  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 *
  19 * This SCTP implementation is distributed in the hope that it
  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
  26 * along with GNU CC; see the file COPYING.  If not, write to
  27 * the Free Software Foundation, 59 Temple Place - Suite 330,
  28 * Boston, MA 02111-1307, USA.
  29 *
  30 * Please send any bug reports or fixes you make to the
  31 * email address(es):
  32 *    lksctp developers <lksctp-developerst@lists.sourceforge.net>
  33 *
  34 * Or submit a bug report through the following website:
  35 *    http://www.sf.net/projects/lksctp
  36 *
  37 * Written or modified by:
  38 *    La Monte H.P. Yarroll <piggy@acm.org>
  39 *    Karl Knutson <karl@athena.chicago.il.us>
  40 *    Jon Grimm <jgrimm@us.ibm.com>
  41 *    Xingang Guo <xingang.guo@intel.com>
  42 *    randall@sctp.chicago.il.us
  43 *    kmorneau@cisco.com
  44 *    qxie1@email.mot.com
  45 *    Sridhar Samudrala <sri@us.ibm.com>
  46 *    Kevin Gao <kevin.gao@intel.com>
  47 *
  48 * Any bugs reported given to us we will try to fix... any fixes shared will
  49 * be incorporated into the next SCTP release.
  50 */
  51#ifndef __LINUX_SCTP_H__
  52#define __LINUX_SCTP_H__
  53
  54#include <linux/in.h>           /* We need in_addr.  */
  55#include <linux/in6.h>          /* We need in6_addr.  */
  56
  57
  58/* Section 3.1.  SCTP Common Header Format */
  59typedef struct sctphdr {
  60        __be16 source;
  61        __be16 dest;
  62        __be32 vtag;
  63        __le32 checksum;
  64} __packed sctp_sctphdr_t;
  65
  66#ifdef __KERNEL__
  67#include <linux/skbuff.h>
  68
  69static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
  70{
  71        return (struct sctphdr *)skb_transport_header(skb);
  72}
  73#endif
  74
  75/* Section 3.2.  Chunk Field Descriptions. */
  76typedef struct sctp_chunkhdr {
  77        __u8 type;
  78        __u8 flags;
  79        __be16 length;
  80} __packed sctp_chunkhdr_t;
  81
  82
  83/* Section 3.2.  Chunk Type Values.
  84 * [Chunk Type] identifies the type of information contained in the Chunk
  85 * Value field. It takes a value from 0 to 254. The value of 255 is
  86 * reserved for future use as an extension field.
  87 */
  88typedef enum {
  89        SCTP_CID_DATA                   = 0,
  90        SCTP_CID_INIT                   = 1,
  91        SCTP_CID_INIT_ACK               = 2,
  92        SCTP_CID_SACK                   = 3,
  93        SCTP_CID_HEARTBEAT              = 4,
  94        SCTP_CID_HEARTBEAT_ACK          = 5,
  95        SCTP_CID_ABORT                  = 6,
  96        SCTP_CID_SHUTDOWN               = 7,
  97        SCTP_CID_SHUTDOWN_ACK           = 8,
  98        SCTP_CID_ERROR                  = 9,
  99        SCTP_CID_COOKIE_ECHO            = 10,
 100        SCTP_CID_COOKIE_ACK             = 11,
 101        SCTP_CID_ECN_ECNE               = 12,
 102        SCTP_CID_ECN_CWR                = 13,
 103        SCTP_CID_SHUTDOWN_COMPLETE      = 14,
 104
 105        /* AUTH Extension Section 4.1 */
 106        SCTP_CID_AUTH                   = 0x0F,
 107
 108        /* PR-SCTP Sec 3.2 */
 109        SCTP_CID_FWD_TSN                = 0xC0,
 110
 111        /* Use hex, as defined in ADDIP sec. 3.1 */
 112        SCTP_CID_ASCONF                 = 0xC1,
 113        SCTP_CID_ASCONF_ACK             = 0x80,
 114} sctp_cid_t; /* enum */
 115
 116
 117/* Section 3.2
 118 *  Chunk Types are encoded such that the highest-order two bits specify
 119 *  the action that must be taken if the processing endpoint does not
 120 *  recognize the Chunk Type.
 121 */
 122typedef enum {
 123        SCTP_CID_ACTION_DISCARD     = 0x00,
 124        SCTP_CID_ACTION_DISCARD_ERR = 0x40,
 125        SCTP_CID_ACTION_SKIP        = 0x80,
 126        SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
 127} sctp_cid_action_t;
 128
 129enum { SCTP_CID_ACTION_MASK = 0xc0, };
 130
 131/* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
 132 *
 133 * 3.3.7 Abort Association (ABORT) (6):
 134 *    The T bit is set to 0 if the sender had a TCB that it destroyed.
 135 *    If the sender did not have a TCB it should set this bit to 1.
 136 */
 137enum { SCTP_CHUNK_FLAG_T = 0x01 };
 138
 139/*
 140 *  Set the T bit
 141 *
 142 *      0                   1                   2                   3
 143 *      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
 144 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 145 *     |   Type = 14   |Reserved     |T|      Length = 4               |
 146 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 147 *
 148 * Chunk Flags: 8 bits
 149 *
 150 *   Reserved:  7 bits
 151 *     Set to 0 on transmit and ignored on receipt.
 152 *
 153 *   T bit:  1 bit
 154 *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
 155 *     the sender did NOT have a TCB it should set this bit to 1.
 156 *
 157 * Note: Special rules apply to this chunk for verification, please
 158 * see Section 8.5.1 for details.
 159 */
 160
 161#define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
 162
 163/* RFC 2960
 164 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
 165 */
 166
 167typedef struct sctp_paramhdr {
 168        __be16 type;
 169        __be16 length;
 170} __packed sctp_paramhdr_t;
 171
 172typedef enum {
 173
 174        /* RFC 2960 Section 3.3.5 */
 175        SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
 176        /* RFC 2960 Section 3.3.2.1 */
 177        SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
 178        SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
 179        SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
 180        SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
 181        SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
 182        SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
 183        SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
 184        SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
 185
 186        /* AUTH Extension Section 3 */
 187        SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
 188        SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
 189        SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
 190
 191        /* Add-IP: Supported Extensions, Section 4.2 */
 192        SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
 193
 194        /* PR-SCTP Sec 3.1 */
 195        SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
 196
 197        /* Add-IP Extension. Section 3.2 */
 198        SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
 199        SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
 200        SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
 201        SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
 202        SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
 203        SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
 204
 205} sctp_param_t; /* enum */
 206
 207
 208/* RFC 2960 Section 3.2.1
 209 *  The Parameter Types are encoded such that the highest-order two bits
 210 *  specify the action that must be taken if the processing endpoint does
 211 *  not recognize the Parameter Type.
 212 *
 213 */
 214typedef enum {
 215        SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
 216        SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
 217        SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
 218        SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
 219} sctp_param_action_t;
 220
 221enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
 222
 223/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
 224
 225typedef struct sctp_datahdr {
 226        __be32 tsn;
 227        __be16 stream;
 228        __be16 ssn;
 229        __be32 ppid;
 230        __u8  payload[0];
 231} __packed sctp_datahdr_t;
 232
 233typedef struct sctp_data_chunk {
 234        sctp_chunkhdr_t chunk_hdr;
 235        sctp_datahdr_t  data_hdr;
 236} __packed sctp_data_chunk_t;
 237
 238/* DATA Chuck Specific Flags */
 239enum {
 240        SCTP_DATA_MIDDLE_FRAG   = 0x00,
 241        SCTP_DATA_LAST_FRAG     = 0x01,
 242        SCTP_DATA_FIRST_FRAG    = 0x02,
 243        SCTP_DATA_NOT_FRAG      = 0x03,
 244        SCTP_DATA_UNORDERED     = 0x04,
 245        SCTP_DATA_SACK_IMM      = 0x08,
 246};
 247enum { SCTP_DATA_FRAG_MASK = 0x03, };
 248
 249
 250/* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
 251 *
 252 *  This chunk is used to initiate a SCTP association between two
 253 *  endpoints.
 254 */
 255typedef struct sctp_inithdr {
 256        __be32 init_tag;
 257        __be32 a_rwnd;
 258        __be16 num_outbound_streams;
 259        __be16 num_inbound_streams;
 260        __be32 initial_tsn;
 261        __u8  params[0];
 262} __packed sctp_inithdr_t;
 263
 264typedef struct sctp_init_chunk {
 265        sctp_chunkhdr_t chunk_hdr;
 266        sctp_inithdr_t init_hdr;
 267} __packed sctp_init_chunk_t;
 268
 269
 270/* Section 3.3.2.1. IPv4 Address Parameter (5) */
 271typedef struct sctp_ipv4addr_param {
 272        sctp_paramhdr_t param_hdr;
 273        struct in_addr  addr;
 274} __packed sctp_ipv4addr_param_t;
 275
 276/* Section 3.3.2.1. IPv6 Address Parameter (6) */
 277typedef struct sctp_ipv6addr_param {
 278        sctp_paramhdr_t param_hdr;
 279        struct in6_addr addr;
 280} __packed sctp_ipv6addr_param_t;
 281
 282/* Section 3.3.2.1 Cookie Preservative (9) */
 283typedef struct sctp_cookie_preserve_param {
 284        sctp_paramhdr_t param_hdr;
 285        __be32          lifespan_increment;
 286} __packed sctp_cookie_preserve_param_t;
 287
 288/* Section 3.3.2.1 Host Name Address (11) */
 289typedef struct sctp_hostname_param {
 290        sctp_paramhdr_t param_hdr;
 291        uint8_t hostname[0];
 292} __packed sctp_hostname_param_t;
 293
 294/* Section 3.3.2.1 Supported Address Types (12) */
 295typedef struct sctp_supported_addrs_param {
 296        sctp_paramhdr_t param_hdr;
 297        __be16 types[0];
 298} __packed sctp_supported_addrs_param_t;
 299
 300/* Appendix A. ECN Capable (32768) */
 301typedef struct sctp_ecn_capable_param {
 302        sctp_paramhdr_t param_hdr;
 303} __packed sctp_ecn_capable_param_t;
 304
 305/* ADDIP Section 3.2.6 Adaptation Layer Indication */
 306typedef struct sctp_adaptation_ind_param {
 307        struct sctp_paramhdr param_hdr;
 308        __be32 adaptation_ind;
 309} __packed sctp_adaptation_ind_param_t;
 310
 311/* ADDIP Section 4.2.7 Supported Extensions Parameter */
 312typedef struct sctp_supported_ext_param {
 313        struct sctp_paramhdr param_hdr;
 314        __u8 chunks[0];
 315} __packed sctp_supported_ext_param_t;
 316
 317/* AUTH Section 3.1 Random */
 318typedef struct sctp_random_param {
 319        sctp_paramhdr_t param_hdr;
 320        __u8 random_val[0];
 321} __packed sctp_random_param_t;
 322
 323/* AUTH Section 3.2 Chunk List */
 324typedef struct sctp_chunks_param {
 325        sctp_paramhdr_t param_hdr;
 326        __u8 chunks[0];
 327} __packed sctp_chunks_param_t;
 328
 329/* AUTH Section 3.3 HMAC Algorithm */
 330typedef struct sctp_hmac_algo_param {
 331        sctp_paramhdr_t param_hdr;
 332        __be16 hmac_ids[0];
 333} __packed sctp_hmac_algo_param_t;
 334
 335/* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
 336 *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
 337 *   association.
 338 */
 339typedef sctp_init_chunk_t sctp_initack_chunk_t;
 340
 341/* Section 3.3.3.1 State Cookie (7) */
 342typedef struct sctp_cookie_param {
 343        sctp_paramhdr_t p;
 344        __u8 body[0];
 345} __packed sctp_cookie_param_t;
 346
 347/* Section 3.3.3.1 Unrecognized Parameters (8) */
 348typedef struct sctp_unrecognized_param {
 349        sctp_paramhdr_t param_hdr;
 350        sctp_paramhdr_t unrecognized;
 351} __packed sctp_unrecognized_param_t;
 352
 353
 354
 355/*
 356 * 3.3.4 Selective Acknowledgement (SACK) (3):
 357 *
 358 *  This chunk is sent to the peer endpoint to acknowledge received DATA
 359 *  chunks and to inform the peer endpoint of gaps in the received
 360 *  subsequences of DATA chunks as represented by their TSNs.
 361 */
 362
 363typedef struct sctp_gap_ack_block {
 364        __be16 start;
 365        __be16 end;
 366} __packed sctp_gap_ack_block_t;
 367
 368typedef __be32 sctp_dup_tsn_t;
 369
 370typedef union {
 371        sctp_gap_ack_block_t    gab;
 372        sctp_dup_tsn_t          dup;
 373} sctp_sack_variable_t;
 374
 375typedef struct sctp_sackhdr {
 376        __be32 cum_tsn_ack;
 377        __be32 a_rwnd;
 378        __be16 num_gap_ack_blocks;
 379        __be16 num_dup_tsns;
 380        sctp_sack_variable_t variable[0];
 381} __packed sctp_sackhdr_t;
 382
 383typedef struct sctp_sack_chunk {
 384        sctp_chunkhdr_t chunk_hdr;
 385        sctp_sackhdr_t sack_hdr;
 386} __packed sctp_sack_chunk_t;
 387
 388
 389/* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
 390 *
 391 *  An endpoint should send this chunk to its peer endpoint to probe the
 392 *  reachability of a particular destination transport address defined in
 393 *  the present association.
 394 */
 395
 396typedef struct sctp_heartbeathdr {
 397        sctp_paramhdr_t info;
 398} __packed sctp_heartbeathdr_t;
 399
 400typedef struct sctp_heartbeat_chunk {
 401        sctp_chunkhdr_t chunk_hdr;
 402        sctp_heartbeathdr_t hb_hdr;
 403} __packed sctp_heartbeat_chunk_t;
 404
 405
 406/* For the abort and shutdown ACK we must carry the init tag in the
 407 * common header. Just the common header is all that is needed with a
 408 * chunk descriptor.
 409 */
 410typedef struct sctp_abort_chunk {
 411        sctp_chunkhdr_t uh;
 412} __packed sctp_abort_chunk_t;
 413
 414
 415/* For the graceful shutdown we must carry the tag (in common header)
 416 * and the highest consecutive acking value.
 417 */
 418typedef struct sctp_shutdownhdr {
 419        __be32 cum_tsn_ack;
 420} __packed sctp_shutdownhdr_t;
 421
 422struct sctp_shutdown_chunk_t {
 423        sctp_chunkhdr_t    chunk_hdr;
 424        sctp_shutdownhdr_t shutdown_hdr;
 425} __packed;
 426
 427/* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
 428
 429typedef struct sctp_errhdr {
 430        __be16 cause;
 431        __be16 length;
 432        __u8  variable[0];
 433} __packed sctp_errhdr_t;
 434
 435typedef struct sctp_operr_chunk {
 436        sctp_chunkhdr_t chunk_hdr;
 437        sctp_errhdr_t   err_hdr;
 438} __packed sctp_operr_chunk_t;
 439
 440/* RFC 2960 3.3.10 - Operation Error
 441 *
 442 * Cause Code: 16 bits (unsigned integer)
 443 *
 444 *     Defines the type of error conditions being reported.
 445 *    Cause Code
 446 *     Value           Cause Code
 447 *     ---------      ----------------
 448 *      1              Invalid Stream Identifier
 449 *      2              Missing Mandatory Parameter
 450 *      3              Stale Cookie Error
 451 *      4              Out of Resource
 452 *      5              Unresolvable Address
 453 *      6              Unrecognized Chunk Type
 454 *      7              Invalid Mandatory Parameter
 455 *      8              Unrecognized Parameters
 456 *      9              No User Data
 457 *     10              Cookie Received While Shutting Down
 458 */
 459typedef enum {
 460
 461        SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
 462        SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
 463        SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
 464        SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
 465        SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
 466        SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
 467        SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
 468        SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
 469        SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
 470        SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
 471        SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
 472
 473
 474        /* SCTP Implementation Guide:
 475         *  11  Restart of an association with new addresses
 476         *  12  User Initiated Abort
 477         *  13  Protocol Violation
 478         */
 479
 480        SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
 481        SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
 482        SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
 483
 484        /* ADDIP Section 3.3  New Error Causes
 485         *
 486         * Four new Error Causes are added to the SCTP Operational Errors,
 487         * primarily for use in the ASCONF-ACK chunk.
 488         *
 489         * Value          Cause Code
 490         * ---------      ----------------
 491         * 0x00A0          Request to Delete Last Remaining IP Address.
 492         * 0x00A1          Operation Refused Due to Resource Shortage.
 493         * 0x00A2          Request to Delete Source IP Address.
 494         * 0x00A3          Association Aborted due to illegal ASCONF-ACK
 495         * 0x00A4          Request refused - no authorization.
 496         */
 497        SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
 498        SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
 499        SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
 500        SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
 501        SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
 502
 503        /* AUTH Section 4.  New Error Cause
 504         *
 505         * This section defines a new error cause that will be sent if an AUTH
 506         * chunk is received with an unsupported HMAC identifier.
 507         * illustrates the new error cause.
 508         *
 509         * Cause Code      Error Cause Name
 510         * --------------------------------------------------------------
 511         * 0x0105          Unsupported HMAC Identifier
 512         */
 513         SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
 514} sctp_error_t;
 515
 516
 517
 518/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 519 *   Explicit Congestion Notification Echo (ECNE) (12)
 520 */
 521typedef struct sctp_ecnehdr {
 522        __be32 lowest_tsn;
 523} sctp_ecnehdr_t;
 524
 525typedef struct sctp_ecne_chunk {
 526        sctp_chunkhdr_t chunk_hdr;
 527        sctp_ecnehdr_t ence_hdr;
 528} __packed sctp_ecne_chunk_t;
 529
 530/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 531 *   Congestion Window Reduced (CWR) (13)
 532 */
 533typedef struct sctp_cwrhdr {
 534        __be32 lowest_tsn;
 535} sctp_cwrhdr_t;
 536
 537typedef struct sctp_cwr_chunk {
 538        sctp_chunkhdr_t chunk_hdr;
 539        sctp_cwrhdr_t cwr_hdr;
 540} __packed sctp_cwr_chunk_t;
 541
 542/* PR-SCTP
 543 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
 544 *
 545 * Forward Cumulative TSN chunk has the following format:
 546 *
 547 *        0                   1                   2                   3
 548 *        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
 549 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 550 *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
 551 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 552 *      |                      New Cumulative TSN                       |
 553 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 554 *      |         Stream-1              |       Stream Sequence-1       |
 555 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 556 *      \                                                               /
 557 *      /                                                               \
 558 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 559 *      |         Stream-N              |       Stream Sequence-N       |
 560 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 561 *
 562 *      Chunk Flags:
 563 *
 564 *        Set to all zeros on transmit and ignored on receipt.
 565 *
 566 *      New Cumulative TSN: 32 bit u_int
 567 *
 568 *       This indicates the new cumulative TSN to the data receiver. Upon
 569 *       the reception of this value, the data receiver MUST consider
 570 *       any missing TSNs earlier than or equal to this value as received
 571 *       and stop reporting them as gaps in any subsequent SACKs.
 572 *
 573 *      Stream-N: 16 bit u_int
 574 *
 575 *       This field holds a stream number that was skipped by this
 576 *       FWD-TSN.
 577 *
 578 *      Stream Sequence-N: 16 bit u_int
 579 *       This field holds the sequence number associated with the stream
 580 *       that was skipped. The stream sequence field holds the largest stream
 581 *       sequence number in this stream being skipped.  The receiver of
 582 *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
 583 *       to enable delivery of any stranded TSN's that remain on the stream
 584 *       re-ordering queues. This field MUST NOT report TSN's corresponding
 585 *       to DATA chunk that are marked as unordered. For ordered DATA
 586 *       chunks this field MUST be filled in.
 587 */
 588struct sctp_fwdtsn_skip {
 589        __be16 stream;
 590        __be16 ssn;
 591} __packed;
 592
 593struct sctp_fwdtsn_hdr {
 594        __be32 new_cum_tsn;
 595        struct sctp_fwdtsn_skip skip[0];
 596} __packed;
 597
 598struct sctp_fwdtsn_chunk {
 599        struct sctp_chunkhdr chunk_hdr;
 600        struct sctp_fwdtsn_hdr fwdtsn_hdr;
 601} __packed;
 602
 603
 604/* ADDIP
 605 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
 606 *
 607 *      Serial Number: 32 bits (unsigned integer)
 608 *      This value represents a Serial Number for the ASCONF Chunk. The
 609 *      valid range of Serial Number is from 0 to 2^32-1.
 610 *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
 611 *
 612 *      Address Parameter: 8 or 20 bytes (depending on type)
 613 *      The address is an address of the sender of the ASCONF chunk,
 614 *      the address MUST be considered part of the association by the
 615 *      peer endpoint. This field may be used by the receiver of the 
 616 *      ASCONF to help in finding the association. This parameter MUST
 617 *      be present in every ASCONF message i.e. it is a mandatory TLV
 618 *      parameter.
 619 *
 620 *      ASCONF Parameter: TLV format
 621 *      Each Address configuration change is represented by a TLV
 622 *      parameter as defined in Section 3.2. One or more requests may
 623 *      be present in an ASCONF Chunk.
 624 *
 625 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
 626 * 
 627 *      Serial Number: 32 bits (unsigned integer)
 628 *      This value represents the Serial Number for the received ASCONF
 629 *      Chunk that is acknowledged by this chunk. This value is copied
 630 *      from the received ASCONF Chunk. 
 631 *
 632 *      ASCONF Parameter Response: TLV format
 633 *      The ASCONF Parameter Response is used in the ASCONF-ACK to
 634 *      report status of ASCONF processing.
 635 */
 636typedef struct sctp_addip_param {
 637        sctp_paramhdr_t param_hdr;
 638        __be32          crr_id;
 639} __packed sctp_addip_param_t;
 640
 641typedef struct sctp_addiphdr {
 642        __be32  serial;
 643        __u8    params[0];
 644} __packed sctp_addiphdr_t;
 645
 646typedef struct sctp_addip_chunk {
 647        sctp_chunkhdr_t chunk_hdr;
 648        sctp_addiphdr_t addip_hdr;
 649} __packed sctp_addip_chunk_t;
 650
 651/* AUTH
 652 * Section 4.1  Authentication Chunk (AUTH)
 653 *
 654 *   This chunk is used to hold the result of the HMAC calculation.
 655 *
 656 *    0                   1                   2                   3
 657 *    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
 658 *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 659 *   | Type = 0x0F   |   Flags=0     |             Length            |
 660 *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 661 *   |     Shared Key Identifier     |   HMAC Identifier             |
 662 *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 663 *   |                                                               |
 664 *   \                             HMAC                              /
 665 *   /                                                               \
 666 *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 667 *
 668 *   Type: 1 byte (unsigned integer)
 669 *      This value MUST be set to 0x0F for  all AUTH-chunks.
 670 *
 671 *   Flags: 1 byte (unsigned integer)
 672 *      Set to zero on transmit and ignored on receipt.
 673 *
 674 *   Length: 2 bytes (unsigned integer)
 675 *      This value holds the length of the HMAC in bytes plus 8.
 676 *
 677 *  Shared Key Identifier: 2 bytes (unsigned integer)
 678 *      This value describes which endpoint pair shared key is used.
 679 *
 680 *   HMAC Identifier: 2 bytes (unsigned integer)
 681 *      This value describes which message digest is being used.  Table 2
 682 *      shows the currently defined values.
 683 *
 684 *    The following Table 2 shows the currently defined values for HMAC
 685 *       identifiers.
 686 *
 687 *       +-----------------+--------------------------+
 688 *       | HMAC Identifier | Message Digest Algorithm |
 689 *       +-----------------+--------------------------+
 690 *       | 0               | Reserved                 |
 691 *       | 1               | SHA-1 defined in [8]     |
 692 *       | 2               | Reserved                 |
 693 *       | 3               | SHA-256 defined in [8]   |
 694 *       +-----------------+--------------------------+
 695 *
 696 *
 697 *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
 698 *      calculation.
 699 */
 700typedef struct sctp_authhdr {
 701        __be16 shkey_id;
 702        __be16 hmac_id;
 703        __u8   hmac[0];
 704} __packed sctp_authhdr_t;
 705
 706typedef struct sctp_auth_chunk {
 707        sctp_chunkhdr_t chunk_hdr;
 708        sctp_authhdr_t auth_hdr;
 709} __packed sctp_auth_chunk_t;
 710
 711#endif /* __LINUX_SCTP_H__ */
 712
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.