include/linux/sctp.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* SCTP kernel reference Implementation
   3  * (C) Copyright IBM Corp. 2001, 2004
   4  * Copyright (c) 1999-2000 Cisco, Inc.
   5  * Copyright (c) 1999-2001 Motorola, Inc.
   6  * Copyright (c) 2001 Intel Corp.
   7  * Copyright (c) 2001 Nokia, Inc.
   8  * Copyright (c) 2001 La Monte H.P. Yarroll
   9  *
  10  * This file is part of the SCTP kernel reference Implementation
  11  *
  12  * Various protocol defined structures.
  13  *
  14  * Please send any bug reports or fixes you make to the
  15  * email address(es):
  16  *    lksctp developers <linux-sctp@vger.kernel.org>
  17  *
  18  * Or submit a bug report through the following website:
  19  *    http://www.sf.net/projects/lksctp
  20  *
  21  * Written or modified by:
  22  *    La Monte H.P. Yarroll <piggy@acm.org>
  23  *    Karl Knutson <karl@athena.chicago.il.us>
  24  *    Jon Grimm <jgrimm@us.ibm.com>
  25  *    Xingang Guo <xingang.guo@intel.com>
  26  *    randall@sctp.chicago.il.us
  27  *    kmorneau@cisco.com
  28  *    qxie1@email.mot.com
  29  *    Sridhar Samudrala <sri@us.ibm.com>
  30  *    Kevin Gao <kevin.gao@intel.com>
  31  *
  32  * Any bugs reported given to us we will try to fix... any fixes shared will
  33  * be incorporated into the next SCTP release.
  34  */
  35 #ifndef __LINUX_SCTP_H__
  36 #define __LINUX_SCTP_H__
  37
  38 #include <linux/in.h>           /* We need in_addr.  */
  39 #include <linux/in6.h>          /* We need in6_addr.  */
  40 #include <linux/skbuff.h>
  41
  42 #include <uapi/linux/sctp.h>
  43
  44 /* Section 3.1.  SCTP Common Header Format */
  45 struct sctphdr {
  46         __be16 source;
  47         __be16 dest;
  48         __be32 vtag;
  49         __le32 checksum;
  50 };
  51
  52 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
  53 {
  54         return (struct sctphdr *)skb_transport_header(skb);
  55 }
  56
  57 /* Section 3.2.  Chunk Field Descriptions. */
  58 struct sctp_chunkhdr {
  59         __u8 type;
  60         __u8 flags;
  61         __be16 length;
  62 };
  63
  64
  65 /* Section 3.2.  Chunk Type Values.
  66  * [Chunk Type] identifies the type of information contained in the Chunk
  67  * Value field. It takes a value from 0 to 254. The value of 255 is
  68  * reserved for future use as an extension field.
  69  */
  70 enum sctp_cid {
  71         SCTP_CID_DATA                   = 0,
  72         SCTP_CID_INIT                   = 1,
  73         SCTP_CID_INIT_ACK               = 2,
  74         SCTP_CID_SACK                   = 3,
  75         SCTP_CID_HEARTBEAT              = 4,
  76         SCTP_CID_HEARTBEAT_ACK          = 5,
  77         SCTP_CID_ABORT                  = 6,
  78         SCTP_CID_SHUTDOWN               = 7,
  79         SCTP_CID_SHUTDOWN_ACK           = 8,
  80         SCTP_CID_ERROR                  = 9,
  81         SCTP_CID_COOKIE_ECHO            = 10,
  82         SCTP_CID_COOKIE_ACK             = 11,
  83         SCTP_CID_ECN_ECNE               = 12,
  84         SCTP_CID_ECN_CWR                = 13,
  85         SCTP_CID_SHUTDOWN_COMPLETE      = 14,
  86
  87         /* AUTH Extension Section 4.1 */
  88         SCTP_CID_AUTH                   = 0x0F,
  89
  90         /* sctp ndata 5.1. I-DATA */
  91         SCTP_CID_I_DATA                 = 0x40,
  92
  93         /* PR-SCTP Sec 3.2 */
  94         SCTP_CID_FWD_TSN                = 0xC0,
  95
  96         /* Use hex, as defined in ADDIP sec. 3.1 */
  97         SCTP_CID_ASCONF                 = 0xC1,
  98         SCTP_CID_I_FWD_TSN              = 0xC2,
  99         SCTP_CID_ASCONF_ACK             = 0x80,
 100         SCTP_CID_RECONF                 = 0x82,
 101 }; /* enum */
 102
 103
 104 /* Section 3.2
 105  *  Chunk Types are encoded such that the highest-order two bits specify
 106  *  the action that must be taken if the processing endpoint does not
 107  *  recognize the Chunk Type.
 108  */
 109 enum {
 110         SCTP_CID_ACTION_DISCARD     = 0x00,
 111         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
 112         SCTP_CID_ACTION_SKIP        = 0x80,
 113         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
 114 };
 115
 116 enum { SCTP_CID_ACTION_MASK = 0xc0, };
 117
 118 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
 119  *
 120  * 3.3.7 Abort Association (ABORT) (6):
 121  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
 122  *    If the sender did not have a TCB it should set this bit to 1.
 123  */
 124 enum { SCTP_CHUNK_FLAG_T = 0x01 };
 125
 126 /*
 127  *  Set the T bit
 128  *
 129  *      0                   1                   2                   3
 130  *      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
 131  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 132  *     |   Type = 14   |Reserved     |T|      Length = 4               |
 133  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 134  *
 135  * Chunk Flags: 8 bits
 136  *
 137  *   Reserved:  7 bits
 138  *     Set to 0 on transmit and ignored on receipt.
 139  *
 140  *   T bit:  1 bit
 141  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
 142  *     the sender did NOT have a TCB it should set this bit to 1.
 143  *
 144  * Note: Special rules apply to this chunk for verification, please
 145  * see Section 8.5.1 for details.
 146  */
 147
 148 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
 149
 150 /* RFC 2960
 151  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
 152  */
 153
 154 struct sctp_paramhdr {
 155         __be16 type;
 156         __be16 length;
 157 };
 158
 159 enum sctp_param {
 160
 161         /* RFC 2960 Section 3.3.5 */
 162         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
 163         /* RFC 2960 Section 3.3.2.1 */
 164         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
 165         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
 166         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
 167         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
 168         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
 169         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
 170         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
 171         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
 172
 173         /* AUTH Extension Section 3 */
 174         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
 175         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
 176         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
 177
 178         /* Add-IP: Supported Extensions, Section 4.2 */
 179         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
 180
 181         /* PR-SCTP Sec 3.1 */
 182         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
 183
 184         /* Add-IP Extension. Section 3.2 */
 185         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
 186         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
 187         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
 188         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
 189         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
 190         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
 191
 192         /* RE-CONFIG. Section 4 */
 193         SCTP_PARAM_RESET_OUT_REQUEST            = cpu_to_be16(0x000d),
 194         SCTP_PARAM_RESET_IN_REQUEST             = cpu_to_be16(0x000e),
 195         SCTP_PARAM_RESET_TSN_REQUEST            = cpu_to_be16(0x000f),
 196         SCTP_PARAM_RESET_RESPONSE               = cpu_to_be16(0x0010),
 197         SCTP_PARAM_RESET_ADD_OUT_STREAMS        = cpu_to_be16(0x0011),
 198         SCTP_PARAM_RESET_ADD_IN_STREAMS         = cpu_to_be16(0x0012),
 199 }; /* enum */
 200
 201
 202 /* RFC 2960 Section 3.2.1
 203  *  The Parameter Types are encoded such that the highest-order two bits
 204  *  specify the action that must be taken if the processing endpoint does
 205  *  not recognize the Parameter Type.
 206  *
 207  */
 208 enum {
 209         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
 210         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
 211         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
 212         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
 213 };
 214
 215 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
 216
 217 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
 218
 219 struct sctp_datahdr {
 220         __be32 tsn;
 221         __be16 stream;
 222         __be16 ssn;
 223         __u32 ppid;
 224         __u8  payload[];
 225 };
 226
 227 struct sctp_data_chunk {
 228         struct sctp_chunkhdr chunk_hdr;
 229         struct sctp_datahdr data_hdr;
 230 };
 231
 232 struct sctp_idatahdr {
 233         __be32 tsn;
 234         __be16 stream;
 235         __be16 reserved;
 236         __be32 mid;
 237         union {
 238                 __u32 ppid;
 239                 __be32 fsn;
 240         };
 241         __u8 payload[0];
 242 };
 243
 244 struct sctp_idata_chunk {
 245         struct sctp_chunkhdr chunk_hdr;
 246         struct sctp_idatahdr data_hdr;
 247 };
 248
 249 /* DATA Chuck Specific Flags */
 250 enum {
 251         SCTP_DATA_MIDDLE_FRAG   = 0x00,
 252         SCTP_DATA_LAST_FRAG     = 0x01,
 253         SCTP_DATA_FIRST_FRAG    = 0x02,
 254         SCTP_DATA_NOT_FRAG      = 0x03,
 255         SCTP_DATA_UNORDERED     = 0x04,
 256         SCTP_DATA_SACK_IMM      = 0x08,
 257 };
 258 enum { SCTP_DATA_FRAG_MASK = 0x03, };
 259
 260
 261 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
 262  *
 263  *  This chunk is used to initiate a SCTP association between two
 264  *  endpoints.
 265  */
 266 struct sctp_inithdr {
 267         __be32 init_tag;
 268         __be32 a_rwnd;
 269         __be16 num_outbound_streams;
 270         __be16 num_inbound_streams;
 271         __be32 initial_tsn;
 272         __u8  params[];
 273 };
 274
 275 struct sctp_init_chunk {
 276         struct sctp_chunkhdr chunk_hdr;
 277         struct sctp_inithdr init_hdr;
 278 };
 279
 280
 281 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
 282 struct sctp_ipv4addr_param {
 283         struct sctp_paramhdr param_hdr;
 284         struct in_addr addr;
 285 };
 286
 287 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
 288 struct sctp_ipv6addr_param {
 289         struct sctp_paramhdr param_hdr;
 290         struct in6_addr addr;
 291 };
 292
 293 /* Section 3.3.2.1 Cookie Preservative (9) */
 294 struct sctp_cookie_preserve_param {
 295         struct sctp_paramhdr param_hdr;
 296         __be32 lifespan_increment;
 297 };
 298
 299 /* Section 3.3.2.1 Host Name Address (11) */
 300 struct sctp_hostname_param {
 301         struct sctp_paramhdr param_hdr;
 302         uint8_t hostname[];
 303 };
 304
 305 /* Section 3.3.2.1 Supported Address Types (12) */
 306 struct sctp_supported_addrs_param {
 307         struct sctp_paramhdr param_hdr;
 308         __be16 types[];
 309 };
 310
 311 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
 312 struct sctp_adaptation_ind_param {
 313         struct sctp_paramhdr param_hdr;
 314         __be32 adaptation_ind;
 315 };
 316
 317 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
 318 struct sctp_supported_ext_param {
 319         struct sctp_paramhdr param_hdr;
 320         __u8 chunks[];
 321 };
 322
 323 /* AUTH Section 3.1 Random */
 324 struct sctp_random_param {
 325         struct sctp_paramhdr param_hdr;
 326         __u8 random_val[];
 327 };
 328
 329 /* AUTH Section 3.2 Chunk List */
 330 struct sctp_chunks_param {
 331         struct sctp_paramhdr param_hdr;
 332         __u8 chunks[];
 333 };
 334
 335 /* AUTH Section 3.3 HMAC Algorithm */
 336 struct sctp_hmac_algo_param {
 337         struct sctp_paramhdr param_hdr;
 338         __be16 hmac_ids[];
 339 };
 340
 341 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
 342  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
 343  *   association.
 344  */
 345 struct sctp_initack_chunk {
 346         struct sctp_chunkhdr chunk_hdr;
 347         struct sctp_inithdr init_hdr;
 348 };
 349
 350 /* Section 3.3.3.1 State Cookie (7) */
 351 struct sctp_cookie_param {
 352         struct sctp_paramhdr p;
 353         __u8 body[];
 354 };
 355
 356 /* Section 3.3.3.1 Unrecognized Parameters (8) */
 357 struct sctp_unrecognized_param {
 358         struct sctp_paramhdr param_hdr;
 359         struct sctp_paramhdr unrecognized;
 360 };
 361
 362
 363
 364 /*
 365  * 3.3.4 Selective Acknowledgement (SACK) (3):
 366  *
 367  *  This chunk is sent to the peer endpoint to acknowledge received DATA
 368  *  chunks and to inform the peer endpoint of gaps in the received
 369  *  subsequences of DATA chunks as represented by their TSNs.
 370  */
 371
 372 struct sctp_gap_ack_block {
 373         __be16 start;
 374         __be16 end;
 375 };
 376
 377 union sctp_sack_variable {
 378         struct sctp_gap_ack_block gab;
 379         __be32 dup;
 380 };
 381
 382 struct sctp_sackhdr {
 383         __be32 cum_tsn_ack;
 384         __be32 a_rwnd;
 385         __be16 num_gap_ack_blocks;
 386         __be16 num_dup_tsns;
 387         union sctp_sack_variable variable[];
 388 };
 389
 390 struct sctp_sack_chunk {
 391         struct sctp_chunkhdr chunk_hdr;
 392         struct sctp_sackhdr sack_hdr;
 393 };
 394
 395
 396 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
 397  *
 398  *  An endpoint should send this chunk to its peer endpoint to probe the
 399  *  reachability of a particular destination transport address defined in
 400  *  the present association.
 401  */
 402
 403 struct sctp_heartbeathdr {
 404         struct sctp_paramhdr info;
 405 };
 406
 407 struct sctp_heartbeat_chunk {
 408         struct sctp_chunkhdr chunk_hdr;
 409         struct sctp_heartbeathdr hb_hdr;
 410 };
 411
 412
 413 /* For the abort and shutdown ACK we must carry the init tag in the
 414  * common header. Just the common header is all that is needed with a
 415  * chunk descriptor.
 416  */
 417 struct sctp_abort_chunk {
 418         struct sctp_chunkhdr uh;
 419 };
 420
 421
 422 /* For the graceful shutdown we must carry the tag (in common header)
 423  * and the highest consecutive acking value.
 424  */
 425 struct sctp_shutdownhdr {
 426         __be32 cum_tsn_ack;
 427 };
 428
 429 struct sctp_shutdown_chunk {
 430         struct sctp_chunkhdr chunk_hdr;
 431         struct sctp_shutdownhdr shutdown_hdr;
 432 };
 433
 434 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
 435
 436 struct sctp_errhdr {
 437         __be16 cause;
 438         __be16 length;
 439         __u8  variable[];
 440 };
 441
 442 struct sctp_operr_chunk {
 443         struct sctp_chunkhdr chunk_hdr;
 444         struct sctp_errhdr err_hdr;
 445 };
 446
 447 /* RFC 2960 3.3.10 - Operation Error
 448  *
 449  * Cause Code: 16 bits (unsigned integer)
 450  *
 451  *     Defines the type of error conditions being reported.
 452  *    Cause Code
 453  *     Value           Cause Code
 454  *     ---------      ----------------
 455  *      1              Invalid Stream Identifier
 456  *      2              Missing Mandatory Parameter
 457  *      3              Stale Cookie Error
 458  *      4              Out of Resource
 459  *      5              Unresolvable Address
 460  *      6              Unrecognized Chunk Type
 461  *      7              Invalid Mandatory Parameter
 462  *      8              Unrecognized Parameters
 463  *      9              No User Data
 464  *     10              Cookie Received While Shutting Down
 465  */
 466 enum sctp_error {
 467
 468         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
 469         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
 470         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
 471         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
 472         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
 473         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
 474         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
 475         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
 476         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
 477         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
 478         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
 479
 480
 481         /* SCTP Implementation Guide:
 482          *  11  Restart of an association with new addresses
 483          *  12  User Initiated Abort
 484          *  13  Protocol Violation
 485          *  14  Restart of an Association with New Encapsulation Port
 486          */
 487
 488         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
 489         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
 490         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
 491         SCTP_ERROR_NEW_ENCAP_PORT  = cpu_to_be16(0x0e),
 492
 493         /* ADDIP Section 3.3  New Error Causes
 494          *
 495          * Four new Error Causes are added to the SCTP Operational Errors,
 496          * primarily for use in the ASCONF-ACK chunk.
 497          *
 498          * Value          Cause Code
 499          * ---------      ----------------
 500          * 0x00A0          Request to Delete Last Remaining IP Address.
 501          * 0x00A1          Operation Refused Due to Resource Shortage.
 502          * 0x00A2          Request to Delete Source IP Address.
 503          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
 504          * 0x00A4          Request refused - no authorization.
 505          */
 506         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
 507         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
 508         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
 509         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
 510         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
 511
 512         /* AUTH Section 4.  New Error Cause
 513          *
 514          * This section defines a new error cause that will be sent if an AUTH
 515          * chunk is received with an unsupported HMAC identifier.
 516          * illustrates the new error cause.
 517          *
 518          * Cause Code      Error Cause Name
 519          * --------------------------------------------------------------
 520          * 0x0105          Unsupported HMAC Identifier
 521          */
 522          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
 523 };
 524
 525
 526
 527 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 528  *   Explicit Congestion Notification Echo (ECNE) (12)
 529  */
 530 struct sctp_ecnehdr {
 531         __be32 lowest_tsn;
 532 };
 533
 534 struct sctp_ecne_chunk {
 535         struct sctp_chunkhdr chunk_hdr;
 536         struct sctp_ecnehdr ence_hdr;
 537 };
 538
 539 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 540  *   Congestion Window Reduced (CWR) (13)
 541  */
 542 struct sctp_cwrhdr {
 543         __be32 lowest_tsn;
 544 };
 545
 546 /* PR-SCTP
 547  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
 548  *
 549  * Forward Cumulative TSN chunk has the following format:
 550  *
 551  *        0                   1                   2                   3
 552  *        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
 553  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 554  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
 555  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 556  *      |                      New Cumulative TSN                       |
 557  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 558  *      |         Stream-1              |       Stream Sequence-1       |
 559  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 560  *      \                                                               /
 561  *      /                                                               \
 562  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 563  *      |         Stream-N              |       Stream Sequence-N       |
 564  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 565  *
 566  *      Chunk Flags:
 567  *
 568  *        Set to all zeros on transmit and ignored on receipt.
 569  *
 570  *      New Cumulative TSN: 32 bit u_int
 571  *
 572  *       This indicates the new cumulative TSN to the data receiver. Upon
 573  *       the reception of this value, the data receiver MUST consider
 574  *       any missing TSNs earlier than or equal to this value as received
 575  *       and stop reporting them as gaps in any subsequent SACKs.
 576  *
 577  *      Stream-N: 16 bit u_int
 578  *
 579  *       This field holds a stream number that was skipped by this
 580  *       FWD-TSN.
 581  *
 582  *      Stream Sequence-N: 16 bit u_int
 583  *       This field holds the sequence number associated with the stream
 584  *       that was skipped. The stream sequence field holds the largest stream
 585  *       sequence number in this stream being skipped.  The receiver of
 586  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
 587  *       to enable delivery of any stranded TSN's that remain on the stream
 588  *       re-ordering queues. This field MUST NOT report TSN's corresponding
 589  *       to DATA chunk that are marked as unordered. For ordered DATA
 590  *       chunks this field MUST be filled in.
 591  */
 592 struct sctp_fwdtsn_skip {
 593         __be16 stream;
 594         __be16 ssn;
 595 };
 596
 597 struct sctp_fwdtsn_hdr {
 598         __be32 new_cum_tsn;
 599         struct sctp_fwdtsn_skip skip[];
 600 };
 601
 602 struct sctp_fwdtsn_chunk {
 603         struct sctp_chunkhdr chunk_hdr;
 604         struct sctp_fwdtsn_hdr fwdtsn_hdr;
 605 };
 606
 607 struct sctp_ifwdtsn_skip {
 608         __be16 stream;
 609         __u8 reserved;
 610         __u8 flags;
 611         __be32 mid;
 612 };
 613
 614 struct sctp_ifwdtsn_hdr {
 615         __be32 new_cum_tsn;
 616         struct sctp_ifwdtsn_skip skip[];
 617 };
 618
 619 struct sctp_ifwdtsn_chunk {
 620         struct sctp_chunkhdr chunk_hdr;
 621         struct sctp_ifwdtsn_hdr fwdtsn_hdr;
 622 };
 623
 624 /* ADDIP
 625  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
 626  *
 627  *      Serial Number: 32 bits (unsigned integer)
 628  *      This value represents a Serial Number for the ASCONF Chunk. The
 629  *      valid range of Serial Number is from 0 to 2^32-1.
 630  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
 631  *
 632  *      Address Parameter: 8 or 20 bytes (depending on type)
 633  *      The address is an address of the sender of the ASCONF chunk,
 634  *      the address MUST be considered part of the association by the
 635  *      peer endpoint. This field may be used by the receiver of the
 636  *      ASCONF to help in finding the association. This parameter MUST
 637  *      be present in every ASCONF message i.e. it is a mandatory TLV
 638  *      parameter.
 639  *
 640  *      ASCONF Parameter: TLV format
 641  *      Each Address configuration change is represented by a TLV
 642  *      parameter as defined in Section 3.2. One or more requests may
 643  *      be present in an ASCONF Chunk.
 644  *
 645  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
 646  *
 647  *      Serial Number: 32 bits (unsigned integer)
 648  *      This value represents the Serial Number for the received ASCONF
 649  *      Chunk that is acknowledged by this chunk. This value is copied
 650  *      from the received ASCONF Chunk.
 651  *
 652  *      ASCONF Parameter Response: TLV format
 653  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
 654  *      report status of ASCONF processing.
 655  */
 656 struct sctp_addip_param {
 657         struct sctp_paramhdr param_hdr;
 658         __be32 crr_id;
 659 };
 660
 661 struct sctp_addiphdr {
 662         __be32  serial;
 663         __u8    params[];
 664 };
 665
 666 struct sctp_addip_chunk {
 667         struct sctp_chunkhdr chunk_hdr;
 668         struct sctp_addiphdr addip_hdr;
 669 };
 670
 671 /* AUTH
 672  * Section 4.1  Authentication Chunk (AUTH)
 673  *
 674  *   This chunk is used to hold the result of the HMAC calculation.
 675  *
 676  *    0                   1                   2                   3
 677  *    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
 678  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 679  *   | Type = 0x0F   |   Flags=0     |             Length            |
 680  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 681  *   |     Shared Key Identifier     |   HMAC Identifier             |
 682  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 683  *   |                                                               |
 684  *   \                             HMAC                              /
 685  *   /                                                               \
 686  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 687  *
 688  *   Type: 1 byte (unsigned integer)
 689  *      This value MUST be set to 0x0F for  all AUTH-chunks.
 690  *
 691  *   Flags: 1 byte (unsigned integer)
 692  *      Set to zero on transmit and ignored on receipt.
 693  *
 694  *   Length: 2 bytes (unsigned integer)
 695  *      This value holds the length of the HMAC in bytes plus 8.
 696  *
 697  *  Shared Key Identifier: 2 bytes (unsigned integer)
 698  *      This value describes which endpoint pair shared key is used.
 699  *
 700  *   HMAC Identifier: 2 bytes (unsigned integer)
 701  *      This value describes which message digest is being used.  Table 2
 702  *      shows the currently defined values.
 703  *
 704  *    The following Table 2 shows the currently defined values for HMAC
 705  *       identifiers.
 706  *
 707  *       +-----------------+--------------------------+
 708  *       | HMAC Identifier | Message Digest Algorithm |
 709  *       +-----------------+--------------------------+
 710  *       | 0               | Reserved                 |
 711  *       | 1               | SHA-1 defined in [8]     |
 712  *       | 2               | Reserved                 |
 713  *       | 3               | SHA-256 defined in [8]   |
 714  *       +-----------------+--------------------------+
 715  *
 716  *
 717  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
 718  *      calculation.
 719  */
 720 struct sctp_authhdr {
 721         __be16 shkey_id;
 722         __be16 hmac_id;
 723         __u8   hmac[];
 724 };
 725
 726 struct sctp_auth_chunk {
 727         struct sctp_chunkhdr chunk_hdr;
 728         struct sctp_authhdr auth_hdr;
 729 };
 730
 731 struct sctp_infox {
 732         struct sctp_info *sctpinfo;
 733         struct sctp_association *asoc;
 734 };
 735
 736 struct sctp_reconf_chunk {
 737         struct sctp_chunkhdr chunk_hdr;
 738         __u8 params[];
 739 };
 740
 741 struct sctp_strreset_outreq {
 742         struct sctp_paramhdr param_hdr;
 743         __be32 request_seq;
 744         __be32 response_seq;
 745         __be32 send_reset_at_tsn;
 746         __be16 list_of_streams[];
 747 };
 748
 749 struct sctp_strreset_inreq {
 750         struct sctp_paramhdr param_hdr;
 751         __be32 request_seq;
 752         __be16 list_of_streams[];
 753 };
 754
 755 struct sctp_strreset_tsnreq {
 756         struct sctp_paramhdr param_hdr;
 757         __be32 request_seq;
 758 };
 759
 760 struct sctp_strreset_addstrm {
 761         struct sctp_paramhdr param_hdr;
 762         __be32 request_seq;
 763         __be16 number_of_streams;
 764         __be16 reserved;
 765 };
 766
 767 enum {
 768         SCTP_STRRESET_NOTHING_TO_DO     = 0x00,
 769         SCTP_STRRESET_PERFORMED         = 0x01,
 770         SCTP_STRRESET_DENIED            = 0x02,
 771         SCTP_STRRESET_ERR_WRONG_SSN     = 0x03,
 772         SCTP_STRRESET_ERR_IN_PROGRESS   = 0x04,
 773         SCTP_STRRESET_ERR_BAD_SEQNO     = 0x05,
 774         SCTP_STRRESET_IN_PROGRESS       = 0x06,
 775 };
 776
 777 struct sctp_strreset_resp {
 778         struct sctp_paramhdr param_hdr;
 779         __be32 response_seq;
 780         __be32 result;
 781 };
 782
 783 struct sctp_strreset_resptsn {
 784         struct sctp_paramhdr param_hdr;
 785         __be32 response_seq;
 786         __be32 result;
 787         __be32 senders_next_tsn;
 788         __be32 receivers_next_tsn;
 789 };
 790
 791 enum {
 792         SCTP_DSCP_SET_MASK = 0x1,
 793         SCTP_DSCP_VAL_MASK = 0xfc,
 794         SCTP_FLOWLABEL_SET_MASK = 0x100000,
 795         SCTP_FLOWLABEL_VAL_MASK = 0xfffff
 796 };
 797
 798 /* UDP Encapsulation
 799  * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4
 800  *
 801  *   The error cause indicating an "Restart of an Association with
 802  *   New Encapsulation Port"
 803  *
 804  * 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
 805  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 806  * |        Cause Code = 14        |       Cause Length = 8        |
 807  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 808  * |   Current Encapsulation Port  |     New Encapsulation Port    |
 809  * +-------------------------------+-------------------------------+
 810  */
 811 struct sctp_new_encap_port_hdr {
 812         __be16 cur_port;
 813         __be16 new_port;
 814 };
 815
 816 #endif /* __LINUX_SCTP_H__ */