include/linux/sctp.h

   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, see
  27  * <http://www.gnu.org/licenses/>.
  28  *
  29  * Please send any bug reports or fixes you make to the
  30  * email address(es):
  31  *    lksctp developers <linux-sctp@vger.kernel.org>
  32  *
  33  * Or submit a bug report through the following website:
  34  *    http://www.sf.net/projects/lksctp
  35  *
  36  * Written or modified by:
  37  *    La Monte H.P. Yarroll <piggy@acm.org>
  38  *    Karl Knutson <karl@athena.chicago.il.us>
  39  *    Jon Grimm <jgrimm@us.ibm.com>
  40  *    Xingang Guo <xingang.guo@intel.com>
  41  *    randall@sctp.chicago.il.us
  42  *    kmorneau@cisco.com
  43  *    qxie1@email.mot.com
  44  *    Sridhar Samudrala <sri@us.ibm.com>
  45  *    Kevin Gao <kevin.gao@intel.com>
  46  *
  47  * Any bugs reported given to us we will try to fix... any fixes shared will
  48  * be incorporated into the next SCTP release.
  49  */
  50 #ifndef __LINUX_SCTP_H__
  51 #define __LINUX_SCTP_H__
  52
  53 #include <linux/in.h>           /* We need in_addr.  */
  54 #include <linux/in6.h>          /* We need in6_addr.  */
  55 #include <linux/skbuff.h>
  56
  57 #include <uapi/linux/sctp.h>
  58
  59 /* Section 3.1.  SCTP Common Header Format */
  60 struct sctphdr {
  61         __be16 source;
  62         __be16 dest;
  63         __be32 vtag;
  64         __le32 checksum;
  65 };
  66
  67 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
  68 {
  69         return (struct sctphdr *)skb_transport_header(skb);
  70 }
  71
  72 /* Section 3.2.  Chunk Field Descriptions. */
  73 struct sctp_chunkhdr {
  74         __u8 type;
  75         __u8 flags;
  76         __be16 length;
  77 };
  78
  79
  80 /* Section 3.2.  Chunk Type Values.
  81  * [Chunk Type] identifies the type of information contained in the Chunk
  82  * Value field. It takes a value from 0 to 254. The value of 255 is
  83  * reserved for future use as an extension field.
  84  */
  85 enum sctp_cid {
  86         SCTP_CID_DATA                   = 0,
  87         SCTP_CID_INIT                   = 1,
  88         SCTP_CID_INIT_ACK               = 2,
  89         SCTP_CID_SACK                   = 3,
  90         SCTP_CID_HEARTBEAT              = 4,
  91         SCTP_CID_HEARTBEAT_ACK          = 5,
  92         SCTP_CID_ABORT                  = 6,
  93         SCTP_CID_SHUTDOWN               = 7,
  94         SCTP_CID_SHUTDOWN_ACK           = 8,
  95         SCTP_CID_ERROR                  = 9,
  96         SCTP_CID_COOKIE_ECHO            = 10,
  97         SCTP_CID_COOKIE_ACK             = 11,
  98         SCTP_CID_ECN_ECNE               = 12,
  99         SCTP_CID_ECN_CWR                = 13,
 100         SCTP_CID_SHUTDOWN_COMPLETE      = 14,
 101
 102         /* AUTH Extension Section 4.1 */
 103         SCTP_CID_AUTH                   = 0x0F,
 104
 105         /* PR-SCTP Sec 3.2 */
 106         SCTP_CID_FWD_TSN                = 0xC0,
 107
 108         /* Use hex, as defined in ADDIP sec. 3.1 */
 109         SCTP_CID_ASCONF                 = 0xC1,
 110         SCTP_CID_ASCONF_ACK             = 0x80,
 111         SCTP_CID_RECONF                 = 0x82,
 112 }; /* enum */
 113
 114
 115 /* Section 3.2
 116  *  Chunk Types are encoded such that the highest-order two bits specify
 117  *  the action that must be taken if the processing endpoint does not
 118  *  recognize the Chunk Type.
 119  */
 120 enum {
 121         SCTP_CID_ACTION_DISCARD     = 0x00,
 122         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
 123         SCTP_CID_ACTION_SKIP        = 0x80,
 124         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
 125 };
 126
 127 enum { SCTP_CID_ACTION_MASK = 0xc0, };
 128
 129 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
 130  *
 131  * 3.3.7 Abort Association (ABORT) (6):
 132  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
 133  *    If the sender did not have a TCB it should set this bit to 1.
 134  */
 135 enum { SCTP_CHUNK_FLAG_T = 0x01 };
 136
 137 /*
 138  *  Set the T bit
 139  *
 140  *      0                   1                   2                   3
 141  *      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
 142  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 143  *     |   Type = 14   |Reserved     |T|      Length = 4               |
 144  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 145  *
 146  * Chunk Flags: 8 bits
 147  *
 148  *   Reserved:  7 bits
 149  *     Set to 0 on transmit and ignored on receipt.
 150  *
 151  *   T bit:  1 bit
 152  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
 153  *     the sender did NOT have a TCB it should set this bit to 1.
 154  *
 155  * Note: Special rules apply to this chunk for verification, please
 156  * see Section 8.5.1 for details.
 157  */
 158
 159 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
 160
 161 /* RFC 2960
 162  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
 163  */
 164
 165 struct sctp_paramhdr {
 166         __be16 type;
 167         __be16 length;
 168 };
 169
 170 enum sctp_param {
 171
 172         /* RFC 2960 Section 3.3.5 */
 173         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
 174         /* RFC 2960 Section 3.3.2.1 */
 175         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
 176         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
 177         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
 178         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
 179         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
 180         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
 181         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
 182         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
 183
 184         /* AUTH Extension Section 3 */
 185         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
 186         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
 187         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
 188
 189         /* Add-IP: Supported Extensions, Section 4.2 */
 190         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
 191
 192         /* PR-SCTP Sec 3.1 */
 193         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
 194
 195         /* Add-IP Extension. Section 3.2 */
 196         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
 197         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
 198         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
 199         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
 200         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
 201         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
 202
 203         /* RE-CONFIG. Section 4 */
 204         SCTP_PARAM_RESET_OUT_REQUEST            = cpu_to_be16(0x000d),
 205         SCTP_PARAM_RESET_IN_REQUEST             = cpu_to_be16(0x000e),
 206         SCTP_PARAM_RESET_TSN_REQUEST            = cpu_to_be16(0x000f),
 207         SCTP_PARAM_RESET_RESPONSE               = cpu_to_be16(0x0010),
 208         SCTP_PARAM_RESET_ADD_OUT_STREAMS        = cpu_to_be16(0x0011),
 209         SCTP_PARAM_RESET_ADD_IN_STREAMS         = cpu_to_be16(0x0012),
 210 }; /* enum */
 211
 212
 213 /* RFC 2960 Section 3.2.1
 214  *  The Parameter Types are encoded such that the highest-order two bits
 215  *  specify the action that must be taken if the processing endpoint does
 216  *  not recognize the Parameter Type.
 217  *
 218  */
 219 enum {
 220         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
 221         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
 222         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
 223         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
 224 };
 225
 226 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
 227
 228 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
 229
 230 struct sctp_datahdr {
 231         __be32 tsn;
 232         __be16 stream;
 233         __be16 ssn;
 234         __u32 ppid;
 235         __u8  payload[0];
 236 };
 237
 238 struct sctp_data_chunk {
 239         struct sctp_chunkhdr chunk_hdr;
 240         struct sctp_datahdr data_hdr;
 241 };
 242
 243 /* DATA Chuck Specific Flags */
 244 enum {
 245         SCTP_DATA_MIDDLE_FRAG   = 0x00,
 246         SCTP_DATA_LAST_FRAG     = 0x01,
 247         SCTP_DATA_FIRST_FRAG    = 0x02,
 248         SCTP_DATA_NOT_FRAG      = 0x03,
 249         SCTP_DATA_UNORDERED     = 0x04,
 250         SCTP_DATA_SACK_IMM      = 0x08,
 251 };
 252 enum { SCTP_DATA_FRAG_MASK = 0x03, };
 253
 254
 255 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
 256  *
 257  *  This chunk is used to initiate a SCTP association between two
 258  *  endpoints.
 259  */
 260 struct sctp_inithdr {
 261         __be32 init_tag;
 262         __be32 a_rwnd;
 263         __be16 num_outbound_streams;
 264         __be16 num_inbound_streams;
 265         __be32 initial_tsn;
 266         __u8  params[0];
 267 };
 268
 269 struct sctp_init_chunk {
 270         struct sctp_chunkhdr chunk_hdr;
 271         struct sctp_inithdr init_hdr;
 272 };
 273
 274
 275 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
 276 struct sctp_ipv4addr_param {
 277         struct sctp_paramhdr param_hdr;
 278         struct in_addr addr;
 279 };
 280
 281 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
 282 struct sctp_ipv6addr_param {
 283         struct sctp_paramhdr param_hdr;
 284         struct in6_addr addr;
 285 };
 286
 287 /* Section 3.3.2.1 Cookie Preservative (9) */
 288 struct sctp_cookie_preserve_param {
 289         struct sctp_paramhdr param_hdr;
 290         __be32 lifespan_increment;
 291 };
 292
 293 /* Section 3.3.2.1 Host Name Address (11) */
 294 struct sctp_hostname_param {
 295         struct sctp_paramhdr param_hdr;
 296         uint8_t hostname[0];
 297 };
 298
 299 /* Section 3.3.2.1 Supported Address Types (12) */
 300 struct sctp_supported_addrs_param {
 301         struct sctp_paramhdr param_hdr;
 302         __be16 types[0];
 303 };
 304
 305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
 306 struct sctp_adaptation_ind_param {
 307         struct sctp_paramhdr param_hdr;
 308         __be32 adaptation_ind;
 309 };
 310
 311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
 312 struct sctp_supported_ext_param {
 313         struct sctp_paramhdr param_hdr;
 314         __u8 chunks[0];
 315 };
 316
 317 /* AUTH Section 3.1 Random */
 318 struct sctp_random_param {
 319         struct sctp_paramhdr param_hdr;
 320         __u8 random_val[0];
 321 };
 322
 323 /* AUTH Section 3.2 Chunk List */
 324 struct sctp_chunks_param {
 325         struct sctp_paramhdr param_hdr;
 326         __u8 chunks[0];
 327 };
 328
 329 /* AUTH Section 3.3 HMAC Algorithm */
 330 struct sctp_hmac_algo_param {
 331         struct sctp_paramhdr param_hdr;
 332         __be16 hmac_ids[0];
 333 };
 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  */
 339 struct sctp_initack_chunk {
 340         struct sctp_chunkhdr chunk_hdr;
 341         struct sctp_inithdr init_hdr;
 342 };
 343
 344 /* Section 3.3.3.1 State Cookie (7) */
 345 struct sctp_cookie_param {
 346         struct sctp_paramhdr p;
 347         __u8 body[0];
 348 };
 349
 350 /* Section 3.3.3.1 Unrecognized Parameters (8) */
 351 struct sctp_unrecognized_param {
 352         struct sctp_paramhdr param_hdr;
 353         struct sctp_paramhdr unrecognized;
 354 };
 355
 356
 357
 358 /*
 359  * 3.3.4 Selective Acknowledgement (SACK) (3):
 360  *
 361  *  This chunk is sent to the peer endpoint to acknowledge received DATA
 362  *  chunks and to inform the peer endpoint of gaps in the received
 363  *  subsequences of DATA chunks as represented by their TSNs.
 364  */
 365
 366 struct sctp_gap_ack_block {
 367         __be16 start;
 368         __be16 end;
 369 };
 370
 371 union sctp_sack_variable {
 372         struct sctp_gap_ack_block gab;
 373         __be32 dup;
 374 };
 375
 376 struct sctp_sackhdr {
 377         __be32 cum_tsn_ack;
 378         __be32 a_rwnd;
 379         __be16 num_gap_ack_blocks;
 380         __be16 num_dup_tsns;
 381         union sctp_sack_variable variable[0];
 382 };
 383
 384 struct sctp_sack_chunk {
 385         struct sctp_chunkhdr chunk_hdr;
 386         struct sctp_sackhdr sack_hdr;
 387 };
 388
 389
 390 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
 391  *
 392  *  An endpoint should send this chunk to its peer endpoint to probe the
 393  *  reachability of a particular destination transport address defined in
 394  *  the present association.
 395  */
 396
 397 struct sctp_heartbeathdr {
 398         struct sctp_paramhdr info;
 399 };
 400
 401 struct sctp_heartbeat_chunk {
 402         struct sctp_chunkhdr chunk_hdr;
 403         struct sctp_heartbeathdr hb_hdr;
 404 };
 405
 406
 407 /* For the abort and shutdown ACK we must carry the init tag in the
 408  * common header. Just the common header is all that is needed with a
 409  * chunk descriptor.
 410  */
 411 struct sctp_abort_chunk {
 412         struct sctp_chunkhdr uh;
 413 };
 414
 415
 416 /* For the graceful shutdown we must carry the tag (in common header)
 417  * and the highest consecutive acking value.
 418  */
 419 struct sctp_shutdownhdr {
 420         __be32 cum_tsn_ack;
 421 };
 422
 423 struct sctp_shutdown_chunk {
 424         struct sctp_chunkhdr chunk_hdr;
 425         struct sctp_shutdownhdr shutdown_hdr;
 426 };
 427
 428 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
 429
 430 struct sctp_errhdr {
 431         __be16 cause;
 432         __be16 length;
 433         __u8  variable[0];
 434 };
 435
 436 struct sctp_operr_chunk {
 437         struct sctp_chunkhdr chunk_hdr;
 438         struct sctp_errhdr err_hdr;
 439 };
 440
 441 /* RFC 2960 3.3.10 - Operation Error
 442  *
 443  * Cause Code: 16 bits (unsigned integer)
 444  *
 445  *     Defines the type of error conditions being reported.
 446  *    Cause Code
 447  *     Value           Cause Code
 448  *     ---------      ----------------
 449  *      1              Invalid Stream Identifier
 450  *      2              Missing Mandatory Parameter
 451  *      3              Stale Cookie Error
 452  *      4              Out of Resource
 453  *      5              Unresolvable Address
 454  *      6              Unrecognized Chunk Type
 455  *      7              Invalid Mandatory Parameter
 456  *      8              Unrecognized Parameters
 457  *      9              No User Data
 458  *     10              Cookie Received While Shutting Down
 459  */
 460 enum sctp_error {
 461
 462         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
 463         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
 464         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
 465         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
 466         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
 467         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
 468         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
 469         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
 470         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
 471         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
 472         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
 473
 474
 475         /* SCTP Implementation Guide:
 476          *  11  Restart of an association with new addresses
 477          *  12  User Initiated Abort
 478          *  13  Protocol Violation
 479          */
 480
 481         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
 482         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
 483         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
 484
 485         /* ADDIP Section 3.3  New Error Causes
 486          *
 487          * Four new Error Causes are added to the SCTP Operational Errors,
 488          * primarily for use in the ASCONF-ACK chunk.
 489          *
 490          * Value          Cause Code
 491          * ---------      ----------------
 492          * 0x00A0          Request to Delete Last Remaining IP Address.
 493          * 0x00A1          Operation Refused Due to Resource Shortage.
 494          * 0x00A2          Request to Delete Source IP Address.
 495          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
 496          * 0x00A4          Request refused - no authorization.
 497          */
 498         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
 499         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
 500         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
 501         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
 502         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
 503
 504         /* AUTH Section 4.  New Error Cause
 505          *
 506          * This section defines a new error cause that will be sent if an AUTH
 507          * chunk is received with an unsupported HMAC identifier.
 508          * illustrates the new error cause.
 509          *
 510          * Cause Code      Error Cause Name
 511          * --------------------------------------------------------------
 512          * 0x0105          Unsupported HMAC Identifier
 513          */
 514          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
 515 };
 516
 517
 518
 519 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 520  *   Explicit Congestion Notification Echo (ECNE) (12)
 521  */
 522 struct sctp_ecnehdr {
 523         __be32 lowest_tsn;
 524 };
 525
 526 struct sctp_ecne_chunk {
 527         struct sctp_chunkhdr chunk_hdr;
 528         struct sctp_ecnehdr ence_hdr;
 529 };
 530
 531 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 532  *   Congestion Window Reduced (CWR) (13)
 533  */
 534 struct sctp_cwrhdr {
 535         __be32 lowest_tsn;
 536 };
 537
 538 /* PR-SCTP
 539  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
 540  *
 541  * Forward Cumulative TSN chunk has the following format:
 542  *
 543  *        0                   1                   2                   3
 544  *        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
 545  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 546  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
 547  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 548  *      |                      New Cumulative TSN                       |
 549  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 550  *      |         Stream-1              |       Stream Sequence-1       |
 551  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 552  *      \                                                               /
 553  *      /                                                               \
 554  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 555  *      |         Stream-N              |       Stream Sequence-N       |
 556  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 557  *
 558  *      Chunk Flags:
 559  *
 560  *        Set to all zeros on transmit and ignored on receipt.
 561  *
 562  *      New Cumulative TSN: 32 bit u_int
 563  *
 564  *       This indicates the new cumulative TSN to the data receiver. Upon
 565  *       the reception of this value, the data receiver MUST consider
 566  *       any missing TSNs earlier than or equal to this value as received
 567  *       and stop reporting them as gaps in any subsequent SACKs.
 568  *
 569  *      Stream-N: 16 bit u_int
 570  *
 571  *       This field holds a stream number that was skipped by this
 572  *       FWD-TSN.
 573  *
 574  *      Stream Sequence-N: 16 bit u_int
 575  *       This field holds the sequence number associated with the stream
 576  *       that was skipped. The stream sequence field holds the largest stream
 577  *       sequence number in this stream being skipped.  The receiver of
 578  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
 579  *       to enable delivery of any stranded TSN's that remain on the stream
 580  *       re-ordering queues. This field MUST NOT report TSN's corresponding
 581  *       to DATA chunk that are marked as unordered. For ordered DATA
 582  *       chunks this field MUST be filled in.
 583  */
 584 struct sctp_fwdtsn_skip {
 585         __be16 stream;
 586         __be16 ssn;
 587 };
 588
 589 struct sctp_fwdtsn_hdr {
 590         __be32 new_cum_tsn;
 591         struct sctp_fwdtsn_skip skip[0];
 592 };
 593
 594 struct sctp_fwdtsn_chunk {
 595         struct sctp_chunkhdr chunk_hdr;
 596         struct sctp_fwdtsn_hdr fwdtsn_hdr;
 597 };
 598
 599
 600 /* ADDIP
 601  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
 602  *
 603  *      Serial Number: 32 bits (unsigned integer)
 604  *      This value represents a Serial Number for the ASCONF Chunk. The
 605  *      valid range of Serial Number is from 0 to 2^32-1.
 606  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
 607  *
 608  *      Address Parameter: 8 or 20 bytes (depending on type)
 609  *      The address is an address of the sender of the ASCONF chunk,
 610  *      the address MUST be considered part of the association by the
 611  *      peer endpoint. This field may be used by the receiver of the
 612  *      ASCONF to help in finding the association. This parameter MUST
 613  *      be present in every ASCONF message i.e. it is a mandatory TLV
 614  *      parameter.
 615  *
 616  *      ASCONF Parameter: TLV format
 617  *      Each Address configuration change is represented by a TLV
 618  *      parameter as defined in Section 3.2. One or more requests may
 619  *      be present in an ASCONF Chunk.
 620  *
 621  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
 622  *
 623  *      Serial Number: 32 bits (unsigned integer)
 624  *      This value represents the Serial Number for the received ASCONF
 625  *      Chunk that is acknowledged by this chunk. This value is copied
 626  *      from the received ASCONF Chunk.
 627  *
 628  *      ASCONF Parameter Response: TLV format
 629  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
 630  *      report status of ASCONF processing.
 631  */
 632 struct sctp_addip_param {
 633         struct sctp_paramhdr param_hdr;
 634         __be32 crr_id;
 635 };
 636
 637 struct sctp_addiphdr {
 638         __be32  serial;
 639         __u8    params[0];
 640 };
 641
 642 struct sctp_addip_chunk {
 643         struct sctp_chunkhdr chunk_hdr;
 644         struct sctp_addiphdr addip_hdr;
 645 };
 646
 647 /* AUTH
 648  * Section 4.1  Authentication Chunk (AUTH)
 649  *
 650  *   This chunk is used to hold the result of the HMAC calculation.
 651  *
 652  *    0                   1                   2                   3
 653  *    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
 654  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 655  *   | Type = 0x0F   |   Flags=0     |             Length            |
 656  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 657  *   |     Shared Key Identifier     |   HMAC Identifier             |
 658  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 659  *   |                                                               |
 660  *   \                             HMAC                              /
 661  *   /                                                               \
 662  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 663  *
 664  *   Type: 1 byte (unsigned integer)
 665  *      This value MUST be set to 0x0F for  all AUTH-chunks.
 666  *
 667  *   Flags: 1 byte (unsigned integer)
 668  *      Set to zero on transmit and ignored on receipt.
 669  *
 670  *   Length: 2 bytes (unsigned integer)
 671  *      This value holds the length of the HMAC in bytes plus 8.
 672  *
 673  *  Shared Key Identifier: 2 bytes (unsigned integer)
 674  *      This value describes which endpoint pair shared key is used.
 675  *
 676  *   HMAC Identifier: 2 bytes (unsigned integer)
 677  *      This value describes which message digest is being used.  Table 2
 678  *      shows the currently defined values.
 679  *
 680  *    The following Table 2 shows the currently defined values for HMAC
 681  *       identifiers.
 682  *
 683  *       +-----------------+--------------------------+
 684  *       | HMAC Identifier | Message Digest Algorithm |
 685  *       +-----------------+--------------------------+
 686  *       | 0               | Reserved                 |
 687  *       | 1               | SHA-1 defined in [8]     |
 688  *       | 2               | Reserved                 |
 689  *       | 3               | SHA-256 defined in [8]   |
 690  *       +-----------------+--------------------------+
 691  *
 692  *
 693  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
 694  *      calculation.
 695  */
 696 struct sctp_authhdr {
 697         __be16 shkey_id;
 698         __be16 hmac_id;
 699         __u8   hmac[0];
 700 };
 701
 702 struct sctp_auth_chunk {
 703         struct sctp_chunkhdr chunk_hdr;
 704         struct sctp_authhdr auth_hdr;
 705 };
 706
 707 struct sctp_infox {
 708         struct sctp_info *sctpinfo;
 709         struct sctp_association *asoc;
 710 };
 711
 712 struct sctp_reconf_chunk {
 713         struct sctp_chunkhdr chunk_hdr;
 714         __u8 params[0];
 715 };
 716
 717 struct sctp_strreset_outreq {
 718         struct sctp_paramhdr param_hdr;
 719         __be32 request_seq;
 720         __be32 response_seq;
 721         __be32 send_reset_at_tsn;
 722         __be16 list_of_streams[0];
 723 };
 724
 725 struct sctp_strreset_inreq {
 726         struct sctp_paramhdr param_hdr;
 727         __be32 request_seq;
 728         __be16 list_of_streams[0];
 729 };
 730
 731 struct sctp_strreset_tsnreq {
 732         struct sctp_paramhdr param_hdr;
 733         __be32 request_seq;
 734 };
 735
 736 struct sctp_strreset_addstrm {
 737         struct sctp_paramhdr param_hdr;
 738         __be32 request_seq;
 739         __be16 number_of_streams;
 740         __be16 reserved;
 741 };
 742
 743 enum {
 744         SCTP_STRRESET_NOTHING_TO_DO     = 0x00,
 745         SCTP_STRRESET_PERFORMED         = 0x01,
 746         SCTP_STRRESET_DENIED            = 0x02,
 747         SCTP_STRRESET_ERR_WRONG_SSN     = 0x03,
 748         SCTP_STRRESET_ERR_IN_PROGRESS   = 0x04,
 749         SCTP_STRRESET_ERR_BAD_SEQNO     = 0x05,
 750         SCTP_STRRESET_IN_PROGRESS       = 0x06,
 751 };
 752
 753 struct sctp_strreset_resp {
 754         struct sctp_paramhdr param_hdr;
 755         __be32 response_seq;
 756         __be32 result;
 757 };
 758
 759 struct sctp_strreset_resptsn {
 760         struct sctp_paramhdr param_hdr;
 761         __be32 response_seq;
 762         __be32 result;
 763         __be32 senders_next_tsn;
 764         __be32 receivers_next_tsn;
 765 };
 766
 767 #endif /* __LINUX_SCTP_H__ */