1 /* SCTP kernel reference Implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * Copyright (c) 2001 Nokia, Inc. 7 * Copyright (c) 2001 La Monte H.P. Yarroll 8 * 9 * This file is part of the SCTP kernel reference Implementation 10 * 11 * Various protocol defined structures. 12 * 13 * This SCTP implementation is free software; 14 * you can redistribute it and/or modify it under the terms of 15 * the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This SCTP implementation is distributed in the hope that it 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 21 * ************************ 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 23 * See the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with GNU CC; see the file COPYING. If not, see 27 * <http://www.gnu.org/licenses/>. 28 * 29 * Please send any bug reports or fixes you make to the 30 * email address(es): 31 * lksctp developers <[email protected]> 32 * 33 * Or submit a bug report through the following website: 34 * http://www.sf.net/projects/lksctp 35 * 36 * Written or modified by: 37 * La Monte H.P. Yarroll <[email protected]> 38 * Karl Knutson <[email protected]> 39 * Jon Grimm <[email protected]> 40 * Xingang Guo <[email protected]> 41 * [email protected] 42 * [email protected] 43 * [email protected] 44 * Sridhar Samudrala <[email protected]> 45 * Kevin Gao <[email protected]> 46 * 47 * Any bugs reported given to us we will try to fix... any fixes shared will 48 * be incorporated into the next SCTP release. 49 */ 50 #ifndef __LINUX_SCTP_H__ 51 #define __LINUX_SCTP_H__ 52 53 #include <linux/in.h> /* We need in_addr. */ 54 #include <linux/in6.h> /* We need in6_addr. */ 55 #include <linux/skbuff.h> 56 57 #include <uapi/linux/sctp.h> 58 59 /* Section 3.1. SCTP Common Header Format */ 60 struct sctphdr { 61 __be16 source; 62 __be16 dest; 63 __be32 vtag; 64 __le32 checksum; 65 }; 66 67 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb) 68 { 69 return (struct sctphdr *)skb_transport_header(skb); 70 } 71 72 /* Section 3.2. Chunk Field Descriptions. */ 73 struct sctp_chunkhdr { 74 __u8 type; 75 __u8 flags; 76 __be16 length; 77 }; 78 79 80 /* Section 3.2. Chunk Type Values. 81 * [Chunk Type] identifies the type of information contained in the Chunk 82 * Value field. It takes a value from 0 to 254. The value of 255 is 83 * reserved for future use as an extension field. 84 */ 85 enum sctp_cid { 86 SCTP_CID_DATA = 0, 87 SCTP_CID_INIT = 1, 88 SCTP_CID_INIT_ACK = 2, 89 SCTP_CID_SACK = 3, 90 SCTP_CID_HEARTBEAT = 4, 91 SCTP_CID_HEARTBEAT_ACK = 5, 92 SCTP_CID_ABORT = 6, 93 SCTP_CID_SHUTDOWN = 7, 94 SCTP_CID_SHUTDOWN_ACK = 8, 95 SCTP_CID_ERROR = 9, 96 SCTP_CID_COOKIE_ECHO = 10, 97 SCTP_CID_COOKIE_ACK = 11, 98 SCTP_CID_ECN_ECNE = 12, 99 SCTP_CID_ECN_CWR = 13, 100 SCTP_CID_SHUTDOWN_COMPLETE = 14, 101 102 /* AUTH Extension Section 4.1 */ 103 SCTP_CID_AUTH = 0x0F, 104 105 /* PR-SCTP Sec 3.2 */ 106 SCTP_CID_FWD_TSN = 0xC0, 107 108 /* Use hex, as defined in ADDIP sec. 3.1 */ 109 SCTP_CID_ASCONF = 0xC1, 110 SCTP_CID_ASCONF_ACK = 0x80, 111 SCTP_CID_RECONF = 0x82, 112 }; /* enum */ 113 114 115 /* Section 3.2 116 * Chunk Types are encoded such that the highest-order two bits specify 117 * the action that must be taken if the processing endpoint does not 118 * recognize the Chunk Type. 119 */ 120 enum { 121 SCTP_CID_ACTION_DISCARD = 0x00, 122 SCTP_CID_ACTION_DISCARD_ERR = 0x40, 123 SCTP_CID_ACTION_SKIP = 0x80, 124 SCTP_CID_ACTION_SKIP_ERR = 0xc0, 125 }; 126 127 enum { SCTP_CID_ACTION_MASK = 0xc0, }; 128 129 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE. 130 * 131 * 3.3.7 Abort Association (ABORT) (6): 132 * The T bit is set to 0 if the sender had a TCB that it destroyed. 133 * If the sender did not have a TCB it should set this bit to 1. 134 */ 135 enum { SCTP_CHUNK_FLAG_T = 0x01 }; 136 137 /* 138 * Set the T bit 139 * 140 * 0 1 2 3 141 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 143 * | Type = 14 |Reserved |T| Length = 4 | 144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 145 * 146 * Chunk Flags: 8 bits 147 * 148 * Reserved: 7 bits 149 * Set to 0 on transmit and ignored on receipt. 150 * 151 * T bit: 1 bit 152 * The T bit is set to 0 if the sender had a TCB that it destroyed. If 153 * the sender did NOT have a TCB it should set this bit to 1. 154 * 155 * Note: Special rules apply to this chunk for verification, please 156 * see Section 8.5.1 for details. 157 */ 158 159 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T) 160 161 /* RFC 2960 162 * Section 3.2.1 Optional/Variable-length Parmaeter Format. 163 */ 164 165 struct sctp_paramhdr { 166 __be16 type; 167 __be16 length; 168 }; 169 170 enum sctp_param { 171 172 /* RFC 2960 Section 3.3.5 */ 173 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1), 174 /* RFC 2960 Section 3.3.2.1 */ 175 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5), 176 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6), 177 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7), 178 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8), 179 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9), 180 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11), 181 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12), 182 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000), 183 184 /* AUTH Extension Section 3 */ 185 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002), 186 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003), 187 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004), 188 189 /* Add-IP: Supported Extensions, Section 4.2 */ 190 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008), 191 192 /* PR-SCTP Sec 3.1 */ 193 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000), 194 195 /* Add-IP Extension. Section 3.2 */ 196 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001), 197 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002), 198 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003), 199 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004), 200 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005), 201 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006), 202 203 /* RE-CONFIG. Section 4 */ 204 SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d), 205 SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e), 206 SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f), 207 SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010), 208 SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011), 209 SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012), 210 }; /* enum */ 211 212 213 /* RFC 2960 Section 3.2.1 214 * The Parameter Types are encoded such that the highest-order two bits 215 * specify the action that must be taken if the processing endpoint does 216 * not recognize the Parameter Type. 217 * 218 */ 219 enum { 220 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000), 221 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000), 222 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000), 223 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000), 224 }; 225 226 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), }; 227 228 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ 229 230 struct sctp_datahdr { 231 __be32 tsn; 232 __be16 stream; 233 __be16 ssn; 234 __be32 ppid; 235 __u8 payload[0]; 236 }; 237 238 struct sctp_data_chunk { 239 struct sctp_chunkhdr chunk_hdr; 240 struct sctp_datahdr data_hdr; 241 }; 242 243 /* DATA Chuck Specific Flags */ 244 enum { 245 SCTP_DATA_MIDDLE_FRAG = 0x00, 246 SCTP_DATA_LAST_FRAG = 0x01, 247 SCTP_DATA_FIRST_FRAG = 0x02, 248 SCTP_DATA_NOT_FRAG = 0x03, 249 SCTP_DATA_UNORDERED = 0x04, 250 SCTP_DATA_SACK_IMM = 0x08, 251 }; 252 enum { SCTP_DATA_FRAG_MASK = 0x03, }; 253 254 255 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 256 * 257 * This chunk is used to initiate a SCTP association between two 258 * endpoints. 259 */ 260 struct sctp_inithdr { 261 __be32 init_tag; 262 __be32 a_rwnd; 263 __be16 num_outbound_streams; 264 __be16 num_inbound_streams; 265 __be32 initial_tsn; 266 __u8 params[0]; 267 }; 268 269 struct sctp_init_chunk { 270 struct sctp_chunkhdr chunk_hdr; 271 struct sctp_inithdr init_hdr; 272 }; 273 274 275 /* Section 3.3.2.1. IPv4 Address Parameter (5) */ 276 typedef struct sctp_ipv4addr_param { 277 struct sctp_paramhdr param_hdr; 278 struct in_addr addr; 279 } sctp_ipv4addr_param_t; 280 281 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ 282 typedef struct sctp_ipv6addr_param { 283 struct sctp_paramhdr param_hdr; 284 struct in6_addr addr; 285 } sctp_ipv6addr_param_t; 286 287 /* Section 3.3.2.1 Cookie Preservative (9) */ 288 typedef struct sctp_cookie_preserve_param { 289 struct sctp_paramhdr param_hdr; 290 __be32 lifespan_increment; 291 } sctp_cookie_preserve_param_t; 292 293 /* Section 3.3.2.1 Host Name Address (11) */ 294 typedef struct sctp_hostname_param { 295 struct sctp_paramhdr param_hdr; 296 uint8_t hostname[0]; 297 } sctp_hostname_param_t; 298 299 /* Section 3.3.2.1 Supported Address Types (12) */ 300 typedef struct sctp_supported_addrs_param { 301 struct sctp_paramhdr param_hdr; 302 __be16 types[0]; 303 } sctp_supported_addrs_param_t; 304 305 /* Appendix A. ECN Capable (32768) */ 306 typedef struct sctp_ecn_capable_param { 307 struct sctp_paramhdr param_hdr; 308 } sctp_ecn_capable_param_t; 309 310 /* ADDIP Section 3.2.6 Adaptation Layer Indication */ 311 typedef struct sctp_adaptation_ind_param { 312 struct sctp_paramhdr param_hdr; 313 __be32 adaptation_ind; 314 } sctp_adaptation_ind_param_t; 315 316 /* ADDIP Section 4.2.7 Supported Extensions Parameter */ 317 typedef struct sctp_supported_ext_param { 318 struct sctp_paramhdr param_hdr; 319 __u8 chunks[0]; 320 } sctp_supported_ext_param_t; 321 322 /* AUTH Section 3.1 Random */ 323 typedef struct sctp_random_param { 324 struct sctp_paramhdr param_hdr; 325 __u8 random_val[0]; 326 } sctp_random_param_t; 327 328 /* AUTH Section 3.2 Chunk List */ 329 typedef struct sctp_chunks_param { 330 struct sctp_paramhdr param_hdr; 331 __u8 chunks[0]; 332 } sctp_chunks_param_t; 333 334 /* AUTH Section 3.3 HMAC Algorithm */ 335 typedef struct sctp_hmac_algo_param { 336 struct sctp_paramhdr param_hdr; 337 __be16 hmac_ids[0]; 338 } sctp_hmac_algo_param_t; 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 */ 344 typedef struct sctp_init_chunk sctp_initack_chunk_t; 345 346 /* Section 3.3.3.1 State Cookie (7) */ 347 typedef struct sctp_cookie_param { 348 struct sctp_paramhdr p; 349 __u8 body[0]; 350 } sctp_cookie_param_t; 351 352 /* Section 3.3.3.1 Unrecognized Parameters (8) */ 353 typedef struct sctp_unrecognized_param { 354 struct sctp_paramhdr param_hdr; 355 struct sctp_paramhdr unrecognized; 356 } sctp_unrecognized_param_t; 357 358 359 360 /* 361 * 3.3.4 Selective Acknowledgement (SACK) (3): 362 * 363 * This chunk is sent to the peer endpoint to acknowledge received DATA 364 * chunks and to inform the peer endpoint of gaps in the received 365 * subsequences of DATA chunks as represented by their TSNs. 366 */ 367 368 typedef struct sctp_gap_ack_block { 369 __be16 start; 370 __be16 end; 371 } sctp_gap_ack_block_t; 372 373 typedef __be32 sctp_dup_tsn_t; 374 375 typedef union { 376 sctp_gap_ack_block_t gab; 377 sctp_dup_tsn_t dup; 378 } sctp_sack_variable_t; 379 380 typedef struct sctp_sackhdr { 381 __be32 cum_tsn_ack; 382 __be32 a_rwnd; 383 __be16 num_gap_ack_blocks; 384 __be16 num_dup_tsns; 385 sctp_sack_variable_t variable[0]; 386 } sctp_sackhdr_t; 387 388 typedef struct sctp_sack_chunk { 389 struct sctp_chunkhdr chunk_hdr; 390 sctp_sackhdr_t sack_hdr; 391 } sctp_sack_chunk_t; 392 393 394 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 395 * 396 * An endpoint should send this chunk to its peer endpoint to probe the 397 * reachability of a particular destination transport address defined in 398 * the present association. 399 */ 400 401 typedef struct sctp_heartbeathdr { 402 struct sctp_paramhdr info; 403 } sctp_heartbeathdr_t; 404 405 typedef struct sctp_heartbeat_chunk { 406 struct sctp_chunkhdr chunk_hdr; 407 sctp_heartbeathdr_t hb_hdr; 408 } sctp_heartbeat_chunk_t; 409 410 411 /* For the abort and shutdown ACK we must carry the init tag in the 412 * common header. Just the common header is all that is needed with a 413 * chunk descriptor. 414 */ 415 typedef struct sctp_abort_chunk { 416 struct sctp_chunkhdr uh; 417 } sctp_abort_chunk_t; 418 419 420 /* For the graceful shutdown we must carry the tag (in common header) 421 * and the highest consecutive acking value. 422 */ 423 typedef struct sctp_shutdownhdr { 424 __be32 cum_tsn_ack; 425 } sctp_shutdownhdr_t; 426 427 struct sctp_shutdown_chunk_t { 428 struct sctp_chunkhdr chunk_hdr; 429 sctp_shutdownhdr_t shutdown_hdr; 430 }; 431 432 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 433 434 typedef struct sctp_errhdr { 435 __be16 cause; 436 __be16 length; 437 __u8 variable[0]; 438 } sctp_errhdr_t; 439 440 typedef struct sctp_operr_chunk { 441 struct sctp_chunkhdr chunk_hdr; 442 sctp_errhdr_t err_hdr; 443 } sctp_operr_chunk_t; 444 445 /* RFC 2960 3.3.10 - Operation Error 446 * 447 * Cause Code: 16 bits (unsigned integer) 448 * 449 * Defines the type of error conditions being reported. 450 * Cause Code 451 * Value Cause Code 452 * --------- ---------------- 453 * 1 Invalid Stream Identifier 454 * 2 Missing Mandatory Parameter 455 * 3 Stale Cookie Error 456 * 4 Out of Resource 457 * 5 Unresolvable Address 458 * 6 Unrecognized Chunk Type 459 * 7 Invalid Mandatory Parameter 460 * 8 Unrecognized Parameters 461 * 9 No User Data 462 * 10 Cookie Received While Shutting Down 463 */ 464 typedef enum { 465 466 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 467 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 468 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 469 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 470 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 471 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 472 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 473 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 474 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 475 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 476 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 477 478 479 /* SCTP Implementation Guide: 480 * 11 Restart of an association with new addresses 481 * 12 User Initiated Abort 482 * 13 Protocol Violation 483 */ 484 485 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 486 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 487 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 488 489 /* ADDIP Section 3.3 New Error Causes 490 * 491 * Four new Error Causes are added to the SCTP Operational Errors, 492 * primarily for use in the ASCONF-ACK chunk. 493 * 494 * Value Cause Code 495 * --------- ---------------- 496 * 0x00A0 Request to Delete Last Remaining IP Address. 497 * 0x00A1 Operation Refused Due to Resource Shortage. 498 * 0x00A2 Request to Delete Source IP Address. 499 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 500 * 0x00A4 Request refused - no authorization. 501 */ 502 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 503 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 504 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 505 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 506 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 507 508 /* AUTH Section 4. New Error Cause 509 * 510 * This section defines a new error cause that will be sent if an AUTH 511 * chunk is received with an unsupported HMAC identifier. 512 * illustrates the new error cause. 513 * 514 * Cause Code Error Cause Name 515 * -------------------------------------------------------------- 516 * 0x0105 Unsupported HMAC Identifier 517 */ 518 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 519 } sctp_error_t; 520 521 522 523 /* RFC 2960. Appendix A. Explicit Congestion Notification. 524 * Explicit Congestion Notification Echo (ECNE) (12) 525 */ 526 typedef struct sctp_ecnehdr { 527 __be32 lowest_tsn; 528 } sctp_ecnehdr_t; 529 530 typedef struct sctp_ecne_chunk { 531 struct sctp_chunkhdr chunk_hdr; 532 sctp_ecnehdr_t ence_hdr; 533 } sctp_ecne_chunk_t; 534 535 /* RFC 2960. Appendix A. Explicit Congestion Notification. 536 * Congestion Window Reduced (CWR) (13) 537 */ 538 typedef struct sctp_cwrhdr { 539 __be32 lowest_tsn; 540 } sctp_cwrhdr_t; 541 542 typedef struct sctp_cwr_chunk { 543 struct sctp_chunkhdr chunk_hdr; 544 sctp_cwrhdr_t cwr_hdr; 545 } sctp_cwr_chunk_t; 546 547 /* PR-SCTP 548 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 549 * 550 * Forward Cumulative TSN chunk has the following format: 551 * 552 * 0 1 2 3 553 * 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 1 554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 555 * | Type = 192 | Flags = 0x00 | Length = Variable | 556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 557 * | New Cumulative TSN | 558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 559 * | Stream-1 | Stream Sequence-1 | 560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 561 * \ / 562 * / \ 563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 564 * | Stream-N | Stream Sequence-N | 565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 566 * 567 * Chunk Flags: 568 * 569 * Set to all zeros on transmit and ignored on receipt. 570 * 571 * New Cumulative TSN: 32 bit u_int 572 * 573 * This indicates the new cumulative TSN to the data receiver. Upon 574 * the reception of this value, the data receiver MUST consider 575 * any missing TSNs earlier than or equal to this value as received 576 * and stop reporting them as gaps in any subsequent SACKs. 577 * 578 * Stream-N: 16 bit u_int 579 * 580 * This field holds a stream number that was skipped by this 581 * FWD-TSN. 582 * 583 * Stream Sequence-N: 16 bit u_int 584 * This field holds the sequence number associated with the stream 585 * that was skipped. The stream sequence field holds the largest stream 586 * sequence number in this stream being skipped. The receiver of 587 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 588 * to enable delivery of any stranded TSN's that remain on the stream 589 * re-ordering queues. This field MUST NOT report TSN's corresponding 590 * to DATA chunk that are marked as unordered. For ordered DATA 591 * chunks this field MUST be filled in. 592 */ 593 struct sctp_fwdtsn_skip { 594 __be16 stream; 595 __be16 ssn; 596 }; 597 598 struct sctp_fwdtsn_hdr { 599 __be32 new_cum_tsn; 600 struct sctp_fwdtsn_skip skip[0]; 601 }; 602 603 struct sctp_fwdtsn_chunk { 604 struct sctp_chunkhdr chunk_hdr; 605 struct sctp_fwdtsn_hdr fwdtsn_hdr; 606 }; 607 608 609 /* ADDIP 610 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 611 * 612 * Serial Number: 32 bits (unsigned integer) 613 * This value represents a Serial Number for the ASCONF Chunk. The 614 * valid range of Serial Number is from 0 to 2^32-1. 615 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 616 * 617 * Address Parameter: 8 or 20 bytes (depending on type) 618 * The address is an address of the sender of the ASCONF chunk, 619 * the address MUST be considered part of the association by the 620 * peer endpoint. This field may be used by the receiver of the 621 * ASCONF to help in finding the association. This parameter MUST 622 * be present in every ASCONF message i.e. it is a mandatory TLV 623 * parameter. 624 * 625 * ASCONF Parameter: TLV format 626 * Each Address configuration change is represented by a TLV 627 * parameter as defined in Section 3.2. One or more requests may 628 * be present in an ASCONF Chunk. 629 * 630 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 631 * 632 * Serial Number: 32 bits (unsigned integer) 633 * This value represents the Serial Number for the received ASCONF 634 * Chunk that is acknowledged by this chunk. This value is copied 635 * from the received ASCONF Chunk. 636 * 637 * ASCONF Parameter Response: TLV format 638 * The ASCONF Parameter Response is used in the ASCONF-ACK to 639 * report status of ASCONF processing. 640 */ 641 typedef struct sctp_addip_param { 642 struct sctp_paramhdr param_hdr; 643 __be32 crr_id; 644 } sctp_addip_param_t; 645 646 typedef struct sctp_addiphdr { 647 __be32 serial; 648 __u8 params[0]; 649 } sctp_addiphdr_t; 650 651 typedef struct sctp_addip_chunk { 652 struct sctp_chunkhdr chunk_hdr; 653 sctp_addiphdr_t addip_hdr; 654 } sctp_addip_chunk_t; 655 656 /* AUTH 657 * Section 4.1 Authentication Chunk (AUTH) 658 * 659 * This chunk is used to hold the result of the HMAC calculation. 660 * 661 * 0 1 2 3 662 * 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 1 663 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 664 * | Type = 0x0F | Flags=0 | Length | 665 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 666 * | Shared Key Identifier | HMAC Identifier | 667 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 668 * | | 669 * \ HMAC / 670 * / \ 671 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 672 * 673 * Type: 1 byte (unsigned integer) 674 * This value MUST be set to 0x0F for all AUTH-chunks. 675 * 676 * Flags: 1 byte (unsigned integer) 677 * Set to zero on transmit and ignored on receipt. 678 * 679 * Length: 2 bytes (unsigned integer) 680 * This value holds the length of the HMAC in bytes plus 8. 681 * 682 * Shared Key Identifier: 2 bytes (unsigned integer) 683 * This value describes which endpoint pair shared key is used. 684 * 685 * HMAC Identifier: 2 bytes (unsigned integer) 686 * This value describes which message digest is being used. Table 2 687 * shows the currently defined values. 688 * 689 * The following Table 2 shows the currently defined values for HMAC 690 * identifiers. 691 * 692 * +-----------------+--------------------------+ 693 * | HMAC Identifier | Message Digest Algorithm | 694 * +-----------------+--------------------------+ 695 * | 0 | Reserved | 696 * | 1 | SHA-1 defined in [8] | 697 * | 2 | Reserved | 698 * | 3 | SHA-256 defined in [8] | 699 * +-----------------+--------------------------+ 700 * 701 * 702 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 703 * calculation. 704 */ 705 typedef struct sctp_authhdr { 706 __be16 shkey_id; 707 __be16 hmac_id; 708 __u8 hmac[0]; 709 } sctp_authhdr_t; 710 711 typedef struct sctp_auth_chunk { 712 struct sctp_chunkhdr chunk_hdr; 713 sctp_authhdr_t auth_hdr; 714 } sctp_auth_chunk_t; 715 716 struct sctp_infox { 717 struct sctp_info *sctpinfo; 718 struct sctp_association *asoc; 719 }; 720 721 struct sctp_reconf_chunk { 722 struct sctp_chunkhdr chunk_hdr; 723 __u8 params[0]; 724 }; 725 726 struct sctp_strreset_outreq { 727 struct sctp_paramhdr param_hdr; 728 __u32 request_seq; 729 __u32 response_seq; 730 __u32 send_reset_at_tsn; 731 __u16 list_of_streams[0]; 732 }; 733 734 struct sctp_strreset_inreq { 735 struct sctp_paramhdr param_hdr; 736 __u32 request_seq; 737 __u16 list_of_streams[0]; 738 }; 739 740 struct sctp_strreset_tsnreq { 741 struct sctp_paramhdr param_hdr; 742 __u32 request_seq; 743 }; 744 745 struct sctp_strreset_addstrm { 746 struct sctp_paramhdr param_hdr; 747 __u32 request_seq; 748 __u16 number_of_streams; 749 __u16 reserved; 750 }; 751 752 enum { 753 SCTP_STRRESET_NOTHING_TO_DO = 0x00, 754 SCTP_STRRESET_PERFORMED = 0x01, 755 SCTP_STRRESET_DENIED = 0x02, 756 SCTP_STRRESET_ERR_WRONG_SSN = 0x03, 757 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04, 758 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05, 759 SCTP_STRRESET_IN_PROGRESS = 0x06, 760 }; 761 762 struct sctp_strreset_resp { 763 struct sctp_paramhdr param_hdr; 764 __u32 response_seq; 765 __u32 result; 766 }; 767 768 struct sctp_strreset_resptsn { 769 struct sctp_paramhdr param_hdr; 770 __u32 response_seq; 771 __u32 result; 772 __u32 senders_next_tsn; 773 __u32 receivers_next_tsn; 774 }; 775 776 #endif /* __LINUX_SCTP_H__ */ 777