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sctp.h
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linux-6.19.14/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 */ 45struct sctphdr { 46 __be16 source; 47 __be16 dest; 48 __be32 vtag; 49 __le32 checksum; 50}; 51 52static 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. */ 58struct 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 */ 70enum 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 SCTP_CID_PAD = 0x84, 102}; /* enum */ 103 104 105/* Section 3.2 106 * Chunk Types are encoded such that the highest-order two bits specify 107 * the action that must be taken if the processing endpoint does not 108 * recognize the Chunk Type. 109 */ 110enum { 111 SCTP_CID_ACTION_DISCARD = 0x00, 112 SCTP_CID_ACTION_DISCARD_ERR = 0x40, 113 SCTP_CID_ACTION_SKIP = 0x80, 114 SCTP_CID_ACTION_SKIP_ERR = 0xc0, 115}; 116 117enum { SCTP_CID_ACTION_MASK = 0xc0, }; 118 119/* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE. 120 * 121 * 3.3.7 Abort Association (ABORT) (6): 122 * The T bit is set to 0 if the sender had a TCB that it destroyed. 123 * If the sender did not have a TCB it should set this bit to 1. 124 */ 125enum { SCTP_CHUNK_FLAG_T = 0x01 }; 126 127/* 128 * Set the T bit 129 * 130 * 0 1 2 3 131 * 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 1 132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 133 * | Type = 14 |Reserved |T| Length = 4 | 134 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 135 * 136 * Chunk Flags: 8 bits 137 * 138 * Reserved: 7 bits 139 * Set to 0 on transmit and ignored on receipt. 140 * 141 * T bit: 1 bit 142 * The T bit is set to 0 if the sender had a TCB that it destroyed. If 143 * the sender did NOT have a TCB it should set this bit to 1. 144 * 145 * Note: Special rules apply to this chunk for verification, please 146 * see Section 8.5.1 for details. 147 */ 148 149#define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T) 150 151/* RFC 2960 152 * Section 3.2.1 Optional/Variable-length Parmaeter Format. 153 */ 154 155struct sctp_paramhdr { 156 __be16 type; 157 __be16 length; 158}; 159 160enum sctp_param { 161 162 /* RFC 2960 Section 3.3.5 */ 163 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1), 164 /* RFC 2960 Section 3.3.2.1 */ 165 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5), 166 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6), 167 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7), 168 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8), 169 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9), 170 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11), 171 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12), 172 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000), 173 174 /* AUTH Extension Section 3 */ 175 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002), 176 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003), 177 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004), 178 179 /* Add-IP: Supported Extensions, Section 4.2 */ 180 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008), 181 182 /* PR-SCTP Sec 3.1 */ 183 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000), 184 185 /* Add-IP Extension. Section 3.2 */ 186 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001), 187 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002), 188 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003), 189 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004), 190 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005), 191 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006), 192 193 /* RE-CONFIG. Section 4 */ 194 SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d), 195 SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e), 196 SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f), 197 SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010), 198 SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011), 199 SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012), 200}; /* enum */ 201 202 203/* RFC 2960 Section 3.2.1 204 * The Parameter Types are encoded such that the highest-order two bits 205 * specify the action that must be taken if the processing endpoint does 206 * not recognize the Parameter Type. 207 * 208 */ 209enum { 210 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000), 211 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000), 212 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000), 213 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000), 214}; 215 216enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), }; 217 218/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ 219 220struct sctp_datahdr { 221 __be32 tsn; 222 __be16 stream; 223 __be16 ssn; 224 __u32 ppid; 225}; 226 227struct sctp_data_chunk { 228 struct sctp_chunkhdr chunk_hdr; 229 struct sctp_datahdr data_hdr; 230}; 231 232struct sctp_idatahdr { 233 __be32 tsn; 234 __be16 stream; 235 __be16 reserved; 236 __be32 mid; 237 union { 238 __u32 ppid; 239 __be32 fsn; 240 }; 241}; 242 243struct sctp_idata_chunk { 244 struct sctp_chunkhdr chunk_hdr; 245 struct sctp_idatahdr data_hdr; 246}; 247 248/* DATA Chuck Specific Flags */ 249enum { 250 SCTP_DATA_MIDDLE_FRAG = 0x00, 251 SCTP_DATA_LAST_FRAG = 0x01, 252 SCTP_DATA_FIRST_FRAG = 0x02, 253 SCTP_DATA_NOT_FRAG = 0x03, 254 SCTP_DATA_UNORDERED = 0x04, 255 SCTP_DATA_SACK_IMM = 0x08, 256}; 257enum { SCTP_DATA_FRAG_MASK = 0x03, }; 258 259 260/* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 261 * 262 * This chunk is used to initiate a SCTP association between two 263 * endpoints. 264 */ 265struct sctp_inithdr { 266 __be32 init_tag; 267 __be32 a_rwnd; 268 __be16 num_outbound_streams; 269 __be16 num_inbound_streams; 270 __be32 initial_tsn; 271 /* __u8 params[]; */ 272}; 273 274struct sctp_init_chunk { 275 struct sctp_chunkhdr chunk_hdr; 276 struct sctp_inithdr init_hdr; 277}; 278 279 280/* Section 3.3.2.1. IPv4 Address Parameter (5) */ 281struct sctp_ipv4addr_param { 282 struct sctp_paramhdr param_hdr; 283 struct in_addr addr; 284}; 285 286/* Section 3.3.2.1. IPv6 Address Parameter (6) */ 287struct sctp_ipv6addr_param { 288 struct sctp_paramhdr param_hdr; 289 struct in6_addr addr; 290}; 291 292/* Section 3.3.2.1 Cookie Preservative (9) */ 293struct sctp_cookie_preserve_param { 294 struct sctp_paramhdr param_hdr; 295 __be32 lifespan_increment; 296}; 297 298/* Section 3.3.2.1 Host Name Address (11) */ 299struct sctp_hostname_param { 300 struct sctp_paramhdr param_hdr; 301 uint8_t hostname[]; 302}; 303 304/* Section 3.3.2.1 Supported Address Types (12) */ 305struct sctp_supported_addrs_param { 306 struct sctp_paramhdr param_hdr; 307 __be16 types[]; 308}; 309 310/* ADDIP Section 3.2.6 Adaptation Layer Indication */ 311struct sctp_adaptation_ind_param { 312 struct sctp_paramhdr param_hdr; 313 __be32 adaptation_ind; 314}; 315 316/* ADDIP Section 4.2.7 Supported Extensions Parameter */ 317struct sctp_supported_ext_param { 318 struct sctp_paramhdr param_hdr; 319 __u8 chunks[]; 320}; 321 322/* AUTH Section 3.1 Random */ 323struct sctp_random_param { 324 struct sctp_paramhdr param_hdr; 325 __u8 random_val[]; 326}; 327 328/* AUTH Section 3.2 Chunk List */ 329struct sctp_chunks_param { 330 struct sctp_paramhdr param_hdr; 331 __u8 chunks[]; 332}; 333 334/* AUTH Section 3.3 HMAC Algorithm */ 335struct sctp_hmac_algo_param { 336 struct sctp_paramhdr param_hdr; 337 __be16 hmac_ids[]; 338}; 339 340/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): 341 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP 342 * association. 343 */ 344struct sctp_initack_chunk { 345 struct sctp_chunkhdr chunk_hdr; 346 struct sctp_inithdr init_hdr; 347}; 348 349/* Section 3.3.3.1 State Cookie (7) */ 350struct sctp_cookie_param { 351 struct sctp_paramhdr p; 352 __u8 body[]; 353}; 354 355/* Section 3.3.3.1 Unrecognized Parameters (8) */ 356struct sctp_unrecognized_param { 357 struct sctp_paramhdr param_hdr; 358 struct sctp_paramhdr unrecognized; 359}; 360 361 362 363/* 364 * 3.3.4 Selective Acknowledgement (SACK) (3): 365 * 366 * This chunk is sent to the peer endpoint to acknowledge received DATA 367 * chunks and to inform the peer endpoint of gaps in the received 368 * subsequences of DATA chunks as represented by their TSNs. 369 */ 370 371struct sctp_gap_ack_block { 372 __be16 start; 373 __be16 end; 374}; 375 376union sctp_sack_variable { 377 struct sctp_gap_ack_block gab; 378 __be32 dup; 379}; 380 381struct sctp_sackhdr { 382 __be32 cum_tsn_ack; 383 __be32 a_rwnd; 384 __be16 num_gap_ack_blocks; 385 __be16 num_dup_tsns; 386 /* union sctp_sack_variable variable[]; */ 387}; 388 389struct sctp_sack_chunk { 390 struct sctp_chunkhdr chunk_hdr; 391 struct sctp_sackhdr sack_hdr; 392}; 393 394 395/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 396 * 397 * An endpoint should send this chunk to its peer endpoint to probe the 398 * reachability of a particular destination transport address defined in 399 * the present association. 400 */ 401 402struct sctp_heartbeathdr { 403 struct sctp_paramhdr info; 404}; 405 406struct sctp_heartbeat_chunk { 407 struct sctp_chunkhdr chunk_hdr; 408 struct sctp_heartbeathdr hb_hdr; 409}; 410 411 412/* PAD chunk could be bundled with heartbeat chunk to probe pmtu */ 413struct sctp_pad_chunk { 414 struct sctp_chunkhdr uh; 415}; 416 417 418/* For the abort and shutdown ACK we must carry the init tag in the 419 * common header. Just the common header is all that is needed with a 420 * chunk descriptor. 421 */ 422struct sctp_abort_chunk { 423 struct sctp_chunkhdr uh; 424}; 425 426 427/* For the graceful shutdown we must carry the tag (in common header) 428 * and the highest consecutive acking value. 429 */ 430struct sctp_shutdownhdr { 431 __be32 cum_tsn_ack; 432}; 433 434struct sctp_shutdown_chunk { 435 struct sctp_chunkhdr chunk_hdr; 436 struct sctp_shutdownhdr shutdown_hdr; 437}; 438 439/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 440 441struct sctp_errhdr { 442 __be16 cause; 443 __be16 length; 444 /* __u8 variable[]; */ 445}; 446 447struct sctp_operr_chunk { 448 struct sctp_chunkhdr chunk_hdr; 449 struct sctp_errhdr err_hdr; 450}; 451 452/* RFC 2960 3.3.10 - Operation Error 453 * 454 * Cause Code: 16 bits (unsigned integer) 455 * 456 * Defines the type of error conditions being reported. 457 * Cause Code 458 * Value Cause Code 459 * --------- ---------------- 460 * 1 Invalid Stream Identifier 461 * 2 Missing Mandatory Parameter 462 * 3 Stale Cookie Error 463 * 4 Out of Resource 464 * 5 Unresolvable Address 465 * 6 Unrecognized Chunk Type 466 * 7 Invalid Mandatory Parameter 467 * 8 Unrecognized Parameters 468 * 9 No User Data 469 * 10 Cookie Received While Shutting Down 470 */ 471enum sctp_error { 472 473 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 474 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 475 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 476 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 477 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 478 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 479 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 480 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 481 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 482 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 483 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 484 485 486 /* SCTP Implementation Guide: 487 * 11 Restart of an association with new addresses 488 * 12 User Initiated Abort 489 * 13 Protocol Violation 490 * 14 Restart of an Association with New Encapsulation Port 491 */ 492 493 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 494 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 495 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 496 SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e), 497 498 /* ADDIP Section 3.3 New Error Causes 499 * 500 * Four new Error Causes are added to the SCTP Operational Errors, 501 * primarily for use in the ASCONF-ACK chunk. 502 * 503 * Value Cause Code 504 * --------- ---------------- 505 * 0x00A0 Request to Delete Last Remaining IP Address. 506 * 0x00A1 Operation Refused Due to Resource Shortage. 507 * 0x00A2 Request to Delete Source IP Address. 508 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 509 * 0x00A4 Request refused - no authorization. 510 */ 511 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 512 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 513 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 514 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 515 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 516 517 /* AUTH Section 4. New Error Cause 518 * 519 * This section defines a new error cause that will be sent if an AUTH 520 * chunk is received with an unsupported HMAC identifier. 521 * illustrates the new error cause. 522 * 523 * Cause Code Error Cause Name 524 * -------------------------------------------------------------- 525 * 0x0105 Unsupported HMAC Identifier 526 */ 527 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 528}; 529 530 531 532/* RFC 2960. Appendix A. Explicit Congestion Notification. 533 * Explicit Congestion Notification Echo (ECNE) (12) 534 */ 535struct sctp_ecnehdr { 536 __be32 lowest_tsn; 537}; 538 539struct sctp_ecne_chunk { 540 struct sctp_chunkhdr chunk_hdr; 541 struct sctp_ecnehdr ence_hdr; 542}; 543 544/* RFC 2960. Appendix A. Explicit Congestion Notification. 545 * Congestion Window Reduced (CWR) (13) 546 */ 547struct sctp_cwrhdr { 548 __be32 lowest_tsn; 549}; 550 551/* PR-SCTP 552 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 553 * 554 * Forward Cumulative TSN chunk has the following format: 555 * 556 * 0 1 2 3 557 * 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 1 558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 559 * | Type = 192 | Flags = 0x00 | Length = Variable | 560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 561 * | New Cumulative TSN | 562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 563 * | Stream-1 | Stream Sequence-1 | 564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 565 * \ / 566 * / \ 567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 568 * | Stream-N | Stream Sequence-N | 569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 570 * 571 * Chunk Flags: 572 * 573 * Set to all zeros on transmit and ignored on receipt. 574 * 575 * New Cumulative TSN: 32 bit u_int 576 * 577 * This indicates the new cumulative TSN to the data receiver. Upon 578 * the reception of this value, the data receiver MUST consider 579 * any missing TSNs earlier than or equal to this value as received 580 * and stop reporting them as gaps in any subsequent SACKs. 581 * 582 * Stream-N: 16 bit u_int 583 * 584 * This field holds a stream number that was skipped by this 585 * FWD-TSN. 586 * 587 * Stream Sequence-N: 16 bit u_int 588 * This field holds the sequence number associated with the stream 589 * that was skipped. The stream sequence field holds the largest stream 590 * sequence number in this stream being skipped. The receiver of 591 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 592 * to enable delivery of any stranded TSN's that remain on the stream 593 * re-ordering queues. This field MUST NOT report TSN's corresponding 594 * to DATA chunk that are marked as unordered. For ordered DATA 595 * chunks this field MUST be filled in. 596 */ 597struct sctp_fwdtsn_skip { 598 __be16 stream; 599 __be16 ssn; 600}; 601 602struct sctp_fwdtsn_hdr { 603 __be32 new_cum_tsn; 604 /* struct sctp_fwdtsn_skip skip[]; */ 605}; 606 607struct sctp_fwdtsn_chunk { 608 struct sctp_chunkhdr chunk_hdr; 609 struct sctp_fwdtsn_hdr fwdtsn_hdr; 610}; 611 612struct sctp_ifwdtsn_skip { 613 __be16 stream; 614 __u8 reserved; 615 __u8 flags; 616 __be32 mid; 617}; 618 619struct sctp_ifwdtsn_hdr { 620 __be32 new_cum_tsn; 621 /* struct sctp_ifwdtsn_skip skip[]; */ 622}; 623 624struct sctp_ifwdtsn_chunk { 625 struct sctp_chunkhdr chunk_hdr; 626 struct sctp_ifwdtsn_hdr fwdtsn_hdr; 627}; 628 629/* ADDIP 630 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 631 * 632 * Serial Number: 32 bits (unsigned integer) 633 * This value represents a Serial Number for the ASCONF Chunk. The 634 * valid range of Serial Number is from 0 to 2^32-1. 635 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 636 * 637 * Address Parameter: 8 or 20 bytes (depending on type) 638 * The address is an address of the sender of the ASCONF chunk, 639 * the address MUST be considered part of the association by the 640 * peer endpoint. This field may be used by the receiver of the 641 * ASCONF to help in finding the association. This parameter MUST 642 * be present in every ASCONF message i.e. it is a mandatory TLV 643 * parameter. 644 * 645 * ASCONF Parameter: TLV format 646 * Each Address configuration change is represented by a TLV 647 * parameter as defined in Section 3.2. One or more requests may 648 * be present in an ASCONF Chunk. 649 * 650 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 651 * 652 * Serial Number: 32 bits (unsigned integer) 653 * This value represents the Serial Number for the received ASCONF 654 * Chunk that is acknowledged by this chunk. This value is copied 655 * from the received ASCONF Chunk. 656 * 657 * ASCONF Parameter Response: TLV format 658 * The ASCONF Parameter Response is used in the ASCONF-ACK to 659 * report status of ASCONF processing. 660 */ 661struct sctp_addip_param { 662 struct sctp_paramhdr param_hdr; 663 __be32 crr_id; 664}; 665 666struct sctp_addiphdr { 667 __be32 serial; 668 /* __u8 params[]; */ 669}; 670 671struct sctp_addip_chunk { 672 struct sctp_chunkhdr chunk_hdr; 673 struct sctp_addiphdr addip_hdr; 674}; 675 676/* AUTH 677 * Section 4.1 Authentication Chunk (AUTH) 678 * 679 * This chunk is used to hold the result of the HMAC calculation. 680 * 681 * 0 1 2 3 682 * 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 1 683 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 684 * | Type = 0x0F | Flags=0 | Length | 685 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 686 * | Shared Key Identifier | HMAC Identifier | 687 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 688 * | | 689 * \ HMAC / 690 * / \ 691 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 692 * 693 * Type: 1 byte (unsigned integer) 694 * This value MUST be set to 0x0F for all AUTH-chunks. 695 * 696 * Flags: 1 byte (unsigned integer) 697 * Set to zero on transmit and ignored on receipt. 698 * 699 * Length: 2 bytes (unsigned integer) 700 * This value holds the length of the HMAC in bytes plus 8. 701 * 702 * Shared Key Identifier: 2 bytes (unsigned integer) 703 * This value describes which endpoint pair shared key is used. 704 * 705 * HMAC Identifier: 2 bytes (unsigned integer) 706 * This value describes which message digest is being used. Table 2 707 * shows the currently defined values. 708 * 709 * The following Table 2 shows the currently defined values for HMAC 710 * identifiers. 711 * 712 * +-----------------+--------------------------+ 713 * | HMAC Identifier | Message Digest Algorithm | 714 * +-----------------+--------------------------+ 715 * | 0 | Reserved | 716 * | 1 | SHA-1 defined in [8] | 717 * | 2 | Reserved | 718 * | 3 | SHA-256 defined in [8] | 719 * +-----------------+--------------------------+ 720 * 721 * 722 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 723 * calculation. 724 */ 725struct sctp_authhdr { 726 __be16 shkey_id; 727 __be16 hmac_id; 728 /* __u8 hmac[]; */ 729}; 730 731struct sctp_auth_chunk { 732 struct sctp_chunkhdr chunk_hdr; 733 struct sctp_authhdr auth_hdr; 734}; 735 736struct sctp_infox { 737 struct sctp_info *sctpinfo; 738 struct sctp_association *asoc; 739}; 740 741struct sctp_reconf_chunk { 742 struct sctp_chunkhdr chunk_hdr; 743 /* __u8 params[]; */ 744}; 745 746struct sctp_strreset_outreq { 747 struct sctp_paramhdr param_hdr; 748 __be32 request_seq; 749 __be32 response_seq; 750 __be32 send_reset_at_tsn; 751 __be16 list_of_streams[]; 752}; 753 754struct sctp_strreset_inreq { 755 struct sctp_paramhdr param_hdr; 756 __be32 request_seq; 757 __be16 list_of_streams[]; 758}; 759 760struct sctp_strreset_tsnreq { 761 struct sctp_paramhdr param_hdr; 762 __be32 request_seq; 763}; 764 765struct sctp_strreset_addstrm { 766 struct sctp_paramhdr param_hdr; 767 __be32 request_seq; 768 __be16 number_of_streams; 769 __be16 reserved; 770}; 771 772enum { 773 SCTP_STRRESET_NOTHING_TO_DO = 0x00, 774 SCTP_STRRESET_PERFORMED = 0x01, 775 SCTP_STRRESET_DENIED = 0x02, 776 SCTP_STRRESET_ERR_WRONG_SSN = 0x03, 777 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04, 778 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05, 779 SCTP_STRRESET_IN_PROGRESS = 0x06, 780}; 781 782struct sctp_strreset_resp { 783 struct sctp_paramhdr param_hdr; 784 __be32 response_seq; 785 __be32 result; 786}; 787 788struct sctp_strreset_resptsn { 789 struct sctp_paramhdr param_hdr; 790 __be32 response_seq; 791 __be32 result; 792 __be32 senders_next_tsn; 793 __be32 receivers_next_tsn; 794}; 795 796enum { 797 SCTP_DSCP_SET_MASK = 0x1, 798 SCTP_DSCP_VAL_MASK = 0xfc, 799 SCTP_FLOWLABEL_SET_MASK = 0x100000, 800 SCTP_FLOWLABEL_VAL_MASK = 0xfffff 801}; 802 803/* UDP Encapsulation 804 * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4 805 * 806 * The error cause indicating an "Restart of an Association with 807 * New Encapsulation Port" 808 * 809 * 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 1 810 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 811 * | Cause Code = 14 | Cause Length = 8 | 812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 813 * | Current Encapsulation Port | New Encapsulation Port | 814 * +-------------------------------+-------------------------------+ 815 */ 816struct sctp_new_encap_port_hdr { 817 __be16 cur_port; 818 __be16 new_port; 819}; 820 821/* Round an int up to the next multiple of 4. */ 822#define SCTP_PAD4(s) (((s)+3)&~3) 823/* Truncate to the previous multiple of 4. */ 824#define SCTP_TRUNC4(s) ((s)&~3) 825 826#endif /* __LINUX_SCTP_H__ */
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