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