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} __attribute__((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} __attribute__((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} __attribute__((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} __attribute__((packed)) sctp_datahdr_t; 232 233typedef struct sctp_data_chunk { 234 sctp_chunkhdr_t chunk_hdr; 235 sctp_datahdr_t data_hdr; 236} __attribute__((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}; 246enum { SCTP_DATA_FRAG_MASK = 0x03, }; 247 248 249/* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 250 * 251 * This chunk is used to initiate a SCTP association between two 252 * endpoints. 253 */ 254typedef struct sctp_inithdr { 255 __be32 init_tag; 256 __be32 a_rwnd; 257 __be16 num_outbound_streams; 258 __be16 num_inbound_streams; 259 __be32 initial_tsn; 260 __u8 params[0]; 261} __attribute__((packed)) sctp_inithdr_t; 262 263typedef struct sctp_init_chunk { 264 sctp_chunkhdr_t chunk_hdr; 265 sctp_inithdr_t init_hdr; 266} __attribute__((packed)) sctp_init_chunk_t; 267 268 269/* Section 3.3.2.1. IPv4 Address Parameter (5) */ 270typedef struct sctp_ipv4addr_param { 271 sctp_paramhdr_t param_hdr; 272 struct in_addr addr; 273} __attribute__((packed)) sctp_ipv4addr_param_t; 274 275/* Section 3.3.2.1. IPv6 Address Parameter (6) */ 276typedef struct sctp_ipv6addr_param { 277 sctp_paramhdr_t param_hdr; 278 struct in6_addr addr; 279} __attribute__((packed)) sctp_ipv6addr_param_t; 280 281/* Section 3.3.2.1 Cookie Preservative (9) */ 282typedef struct sctp_cookie_preserve_param { 283 sctp_paramhdr_t param_hdr; 284 __be32 lifespan_increment; 285} __attribute__((packed)) sctp_cookie_preserve_param_t; 286 287/* Section 3.3.2.1 Host Name Address (11) */ 288typedef struct sctp_hostname_param { 289 sctp_paramhdr_t param_hdr; 290 uint8_t hostname[0]; 291} __attribute__((packed)) sctp_hostname_param_t; 292 293/* Section 3.3.2.1 Supported Address Types (12) */ 294typedef struct sctp_supported_addrs_param { 295 sctp_paramhdr_t param_hdr; 296 __be16 types[0]; 297} __attribute__((packed)) sctp_supported_addrs_param_t; 298 299/* Appendix A. ECN Capable (32768) */ 300typedef struct sctp_ecn_capable_param { 301 sctp_paramhdr_t param_hdr; 302} __attribute__((packed)) sctp_ecn_capable_param_t; 303 304/* ADDIP Section 3.2.6 Adaptation Layer Indication */ 305typedef struct sctp_adaptation_ind_param { 306 struct sctp_paramhdr param_hdr; 307 __be32 adaptation_ind; 308} __attribute__((packed)) sctp_adaptation_ind_param_t; 309 310/* ADDIP Section 4.2.7 Supported Extensions Parameter */ 311typedef struct sctp_supported_ext_param { 312 struct sctp_paramhdr param_hdr; 313 __u8 chunks[0]; 314} __attribute__((packed)) sctp_supported_ext_param_t; 315 316/* AUTH Section 3.1 Random */ 317typedef struct sctp_random_param { 318 sctp_paramhdr_t param_hdr; 319 __u8 random_val[0]; 320} __attribute__((packed)) sctp_random_param_t; 321 322/* AUTH Section 3.2 Chunk List */ 323typedef struct sctp_chunks_param { 324 sctp_paramhdr_t param_hdr; 325 __u8 chunks[0]; 326} __attribute__((packed)) sctp_chunks_param_t; 327 328/* AUTH Section 3.3 HMAC Algorithm */ 329typedef struct sctp_hmac_algo_param { 330 sctp_paramhdr_t param_hdr; 331 __be16 hmac_ids[0]; 332} __attribute__((packed)) sctp_hmac_algo_param_t; 333 334/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): 335 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP 336 * association. 337 */ 338typedef sctp_init_chunk_t sctp_initack_chunk_t; 339 340/* Section 3.3.3.1 State Cookie (7) */ 341typedef struct sctp_cookie_param { 342 sctp_paramhdr_t p; 343 __u8 body[0]; 344} __attribute__((packed)) sctp_cookie_param_t; 345 346/* Section 3.3.3.1 Unrecognized Parameters (8) */ 347typedef struct sctp_unrecognized_param { 348 sctp_paramhdr_t param_hdr; 349 sctp_paramhdr_t unrecognized; 350} __attribute__((packed)) sctp_unrecognized_param_t; 351 352 353 354/* 355 * 3.3.4 Selective Acknowledgement (SACK) (3): 356 * 357 * This chunk is sent to the peer endpoint to acknowledge received DATA 358 * chunks and to inform the peer endpoint of gaps in the received 359 * subsequences of DATA chunks as represented by their TSNs. 360 */ 361 362typedef struct sctp_gap_ack_block { 363 __be16 start; 364 __be16 end; 365} __attribute__((packed)) sctp_gap_ack_block_t; 366 367typedef __be32 sctp_dup_tsn_t; 368 369typedef union { 370 sctp_gap_ack_block_t gab; 371 sctp_dup_tsn_t dup; 372} sctp_sack_variable_t; 373 374typedef struct sctp_sackhdr { 375 __be32 cum_tsn_ack; 376 __be32 a_rwnd; 377 __be16 num_gap_ack_blocks; 378 __be16 num_dup_tsns; 379 sctp_sack_variable_t variable[0]; 380} __attribute__((packed)) sctp_sackhdr_t; 381 382typedef struct sctp_sack_chunk { 383 sctp_chunkhdr_t chunk_hdr; 384 sctp_sackhdr_t sack_hdr; 385} __attribute__((packed)) sctp_sack_chunk_t; 386 387 388/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 389 * 390 * An endpoint should send this chunk to its peer endpoint to probe the 391 * reachability of a particular destination transport address defined in 392 * the present association. 393 */ 394 395typedef struct sctp_heartbeathdr { 396 sctp_paramhdr_t info; 397} __attribute__((packed)) sctp_heartbeathdr_t; 398 399typedef struct sctp_heartbeat_chunk { 400 sctp_chunkhdr_t chunk_hdr; 401 sctp_heartbeathdr_t hb_hdr; 402} __attribute__((packed)) sctp_heartbeat_chunk_t; 403 404 405/* For the abort and shutdown ACK we must carry the init tag in the 406 * common header. Just the common header is all that is needed with a 407 * chunk descriptor. 408 */ 409typedef struct sctp_abort_chunk { 410 sctp_chunkhdr_t uh; 411} __attribute__((packed)) sctp_abort_chunk_t; 412 413 414/* For the graceful shutdown we must carry the tag (in common header) 415 * and the highest consecutive acking value. 416 */ 417typedef struct sctp_shutdownhdr { 418 __be32 cum_tsn_ack; 419} __attribute__((packed)) sctp_shutdownhdr_t; 420 421struct sctp_shutdown_chunk_t { 422 sctp_chunkhdr_t chunk_hdr; 423 sctp_shutdownhdr_t shutdown_hdr; 424} __attribute__ ((packed)); 425 426/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 427 428typedef struct sctp_errhdr { 429 __be16 cause; 430 __be16 length; 431 __u8 variable[0]; 432} __attribute__((packed)) sctp_errhdr_t; 433 434typedef struct sctp_operr_chunk { 435 sctp_chunkhdr_t chunk_hdr; 436 sctp_errhdr_t err_hdr; 437} __attribute__((packed)) sctp_operr_chunk_t; 438 439/* RFC 2960 3.3.10 - Operation Error 440 * 441 * Cause Code: 16 bits (unsigned integer) 442 * 443 * Defines the type of error conditions being reported. 444 * Cause Code 445 * Value Cause Code 446 * --------- ---------------- 447 * 1 Invalid Stream Identifier 448 * 2 Missing Mandatory Parameter 449 * 3 Stale Cookie Error 450 * 4 Out of Resource 451 * 5 Unresolvable Address 452 * 6 Unrecognized Chunk Type 453 * 7 Invalid Mandatory Parameter 454 * 8 Unrecognized Parameters 455 * 9 No User Data 456 * 10 Cookie Received While Shutting Down 457 */ 458typedef enum { 459 460 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 461 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 462 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 463 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 464 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 465 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 466 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 467 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 468 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 469 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 470 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 471 472 473 /* SCTP Implementation Guide: 474 * 11 Restart of an association with new addresses 475 * 12 User Initiated Abort 476 * 13 Protocol Violation 477 */ 478 479 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 480 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 481 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 482 483 /* ADDIP Section 3.3 New Error Causes 484 * 485 * Four new Error Causes are added to the SCTP Operational Errors, 486 * primarily for use in the ASCONF-ACK chunk. 487 * 488 * Value Cause Code 489 * --------- ---------------- 490 * 0x00A0 Request to Delete Last Remaining IP Address. 491 * 0x00A1 Operation Refused Due to Resource Shortage. 492 * 0x00A2 Request to Delete Source IP Address. 493 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 494 * 0x00A4 Request refused - no authorization. 495 */ 496 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 497 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 498 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 499 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 500 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 501 502 /* AUTH Section 4. New Error Cause 503 * 504 * This section defines a new error cause that will be sent if an AUTH 505 * chunk is received with an unsupported HMAC identifier. 506 * illustrates the new error cause. 507 * 508 * Cause Code Error Cause Name 509 * -------------------------------------------------------------- 510 * 0x0105 Unsupported HMAC Identifier 511 */ 512 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 513} sctp_error_t; 514 515 516 517/* RFC 2960. Appendix A. Explicit Congestion Notification. 518 * Explicit Congestion Notification Echo (ECNE) (12) 519 */ 520typedef struct sctp_ecnehdr { 521 __be32 lowest_tsn; 522} sctp_ecnehdr_t; 523 524typedef struct sctp_ecne_chunk { 525 sctp_chunkhdr_t chunk_hdr; 526 sctp_ecnehdr_t ence_hdr; 527} __attribute__((packed)) sctp_ecne_chunk_t; 528 529/* RFC 2960. Appendix A. Explicit Congestion Notification. 530 * Congestion Window Reduced (CWR) (13) 531 */ 532typedef struct sctp_cwrhdr { 533 __be32 lowest_tsn; 534} sctp_cwrhdr_t; 535 536typedef struct sctp_cwr_chunk { 537 sctp_chunkhdr_t chunk_hdr; 538 sctp_cwrhdr_t cwr_hdr; 539} __attribute__((packed)) sctp_cwr_chunk_t; 540 541/* PR-SCTP 542 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 543 * 544 * Forward Cumulative TSN chunk has the following format: 545 * 546 * 0 1 2 3 547 * 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 1 548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 549 * | Type = 192 | Flags = 0x00 | Length = Variable | 550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 551 * | New Cumulative TSN | 552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 553 * | Stream-1 | Stream Sequence-1 | 554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 555 * \ / 556 * / \ 557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 558 * | Stream-N | Stream Sequence-N | 559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 560 * 561 * Chunk Flags: 562 * 563 * Set to all zeros on transmit and ignored on receipt. 564 * 565 * New Cumulative TSN: 32 bit u_int 566 * 567 * This indicates the new cumulative TSN to the data receiver. Upon 568 * the reception of this value, the data receiver MUST consider 569 * any missing TSNs earlier than or equal to this value as received 570 * and stop reporting them as gaps in any subsequent SACKs. 571 * 572 * Stream-N: 16 bit u_int 573 * 574 * This field holds a stream number that was skipped by this 575 * FWD-TSN. 576 * 577 * Stream Sequence-N: 16 bit u_int 578 * This field holds the sequence number associated with the stream 579 * that was skipped. The stream sequence field holds the largest stream 580 * sequence number in this stream being skipped. The receiver of 581 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 582 * to enable delivery of any stranded TSN's that remain on the stream 583 * re-ordering queues. This field MUST NOT report TSN's corresponding 584 * to DATA chunk that are marked as unordered. For ordered DATA 585 * chunks this field MUST be filled in. 586 */ 587struct sctp_fwdtsn_skip { 588 __be16 stream; 589 __be16 ssn; 590} __attribute__((packed)); 591 592struct sctp_fwdtsn_hdr { 593 __be32 new_cum_tsn; 594 struct sctp_fwdtsn_skip skip[0]; 595} __attribute((packed)); 596 597struct sctp_fwdtsn_chunk { 598 struct sctp_chunkhdr chunk_hdr; 599 struct sctp_fwdtsn_hdr fwdtsn_hdr; 600} __attribute((packed)); 601 602 603/* ADDIP 604 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 605 * 606 * Serial Number: 32 bits (unsigned integer) 607 * This value represents a Serial Number for the ASCONF Chunk. The 608 * valid range of Serial Number is from 0 to 2^32-1. 609 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 610 * 611 * Address Parameter: 8 or 20 bytes (depending on type) 612 * The address is an address of the sender of the ASCONF chunk, 613 * the address MUST be considered part of the association by the 614 * peer endpoint. This field may be used by the receiver of the 615 * ASCONF to help in finding the association. This parameter MUST 616 * be present in every ASCONF message i.e. it is a mandatory TLV 617 * parameter. 618 * 619 * ASCONF Parameter: TLV format 620 * Each Address configuration change is represented by a TLV 621 * parameter as defined in Section 3.2. One or more requests may 622 * be present in an ASCONF Chunk. 623 * 624 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 625 * 626 * Serial Number: 32 bits (unsigned integer) 627 * This value represents the Serial Number for the received ASCONF 628 * Chunk that is acknowledged by this chunk. This value is copied 629 * from the received ASCONF Chunk. 630 * 631 * ASCONF Parameter Response: TLV format 632 * The ASCONF Parameter Response is used in the ASCONF-ACK to 633 * report status of ASCONF processing. 634 */ 635typedef struct sctp_addip_param { 636 sctp_paramhdr_t param_hdr; 637 __be32 crr_id; 638} __attribute__((packed)) sctp_addip_param_t; 639 640typedef struct sctp_addiphdr { 641 __be32 serial; 642 __u8 params[0]; 643} __attribute__((packed)) sctp_addiphdr_t; 644 645typedef struct sctp_addip_chunk { 646 sctp_chunkhdr_t chunk_hdr; 647 sctp_addiphdr_t addip_hdr; 648} __attribute__((packed)) sctp_addip_chunk_t; 649 650/* AUTH 651 * Section 4.1 Authentication Chunk (AUTH) 652 * 653 * This chunk is used to hold the result of the HMAC calculation. 654 * 655 * 0 1 2 3 656 * 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 1 657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 658 * | Type = 0x0F | Flags=0 | Length | 659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 660 * | Shared Key Identifier | HMAC Identifier | 661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 662 * | | 663 * \ HMAC / 664 * / \ 665 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 666 * 667 * Type: 1 byte (unsigned integer) 668 * This value MUST be set to 0x0F for all AUTH-chunks. 669 * 670 * Flags: 1 byte (unsigned integer) 671 * Set to zero on transmit and ignored on receipt. 672 * 673 * Length: 2 bytes (unsigned integer) 674 * This value holds the length of the HMAC in bytes plus 8. 675 * 676 * Shared Key Identifier: 2 bytes (unsigned integer) 677 * This value describes which endpoint pair shared key is used. 678 * 679 * HMAC Identifier: 2 bytes (unsigned integer) 680 * This value describes which message digest is being used. Table 2 681 * shows the currently defined values. 682 * 683 * The following Table 2 shows the currently defined values for HMAC 684 * identifiers. 685 * 686 * +-----------------+--------------------------+ 687 * | HMAC Identifier | Message Digest Algorithm | 688 * +-----------------+--------------------------+ 689 * | 0 | Reserved | 690 * | 1 | SHA-1 defined in [8] | 691 * | 2 | Reserved | 692 * | 3 | SHA-256 defined in [8] | 693 * +-----------------+--------------------------+ 694 * 695 * 696 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 697 * calculation. 698 */ 699typedef struct sctp_authhdr { 700 __be16 shkey_id; 701 __be16 hmac_id; 702 __u8 hmac[0]; 703} __attribute__((packed)) sctp_authhdr_t; 704 705typedef struct sctp_auth_chunk { 706 sctp_chunkhdr_t chunk_hdr; 707 sctp_authhdr_t auth_hdr; 708} __attribute__((packed)) sctp_auth_chunk_t; 709 710#endif /* __LINUX_SCTP_H__ */ 711