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 struct sctp_ipv4addr_param { 277 struct sctp_paramhdr param_hdr; 278 struct in_addr addr; 279 }; 280 281 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ 282 struct sctp_ipv6addr_param { 283 struct sctp_paramhdr param_hdr; 284 struct in6_addr addr; 285 }; 286 287 /* Section 3.3.2.1 Cookie Preservative (9) */ 288 struct sctp_cookie_preserve_param { 289 struct sctp_paramhdr param_hdr; 290 __be32 lifespan_increment; 291 }; 292 293 /* Section 3.3.2.1 Host Name Address (11) */ 294 struct sctp_hostname_param { 295 struct sctp_paramhdr param_hdr; 296 uint8_t hostname[0]; 297 }; 298 299 /* Section 3.3.2.1 Supported Address Types (12) */ 300 struct sctp_supported_addrs_param { 301 struct sctp_paramhdr param_hdr; 302 __be16 types[0]; 303 }; 304 305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */ 306 struct sctp_adaptation_ind_param { 307 struct sctp_paramhdr param_hdr; 308 __be32 adaptation_ind; 309 }; 310 311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */ 312 struct sctp_supported_ext_param { 313 struct sctp_paramhdr param_hdr; 314 __u8 chunks[0]; 315 }; 316 317 /* AUTH Section 3.1 Random */ 318 struct sctp_random_param { 319 struct sctp_paramhdr param_hdr; 320 __u8 random_val[0]; 321 }; 322 323 /* AUTH Section 3.2 Chunk List */ 324 struct sctp_chunks_param { 325 struct sctp_paramhdr param_hdr; 326 __u8 chunks[0]; 327 }; 328 329 /* AUTH Section 3.3 HMAC Algorithm */ 330 struct sctp_hmac_algo_param { 331 struct sctp_paramhdr param_hdr; 332 __be16 hmac_ids[0]; 333 }; 334 335 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): 336 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP 337 * association. 338 */ 339 struct sctp_initack_chunk { 340 struct sctp_chunkhdr chunk_hdr; 341 struct sctp_inithdr init_hdr; 342 }; 343 344 /* Section 3.3.3.1 State Cookie (7) */ 345 struct sctp_cookie_param { 346 struct sctp_paramhdr p; 347 __u8 body[0]; 348 }; 349 350 /* Section 3.3.3.1 Unrecognized Parameters (8) */ 351 struct sctp_unrecognized_param { 352 struct sctp_paramhdr param_hdr; 353 struct sctp_paramhdr unrecognized; 354 }; 355 356 357 358 /* 359 * 3.3.4 Selective Acknowledgement (SACK) (3): 360 * 361 * This chunk is sent to the peer endpoint to acknowledge received DATA 362 * chunks and to inform the peer endpoint of gaps in the received 363 * subsequences of DATA chunks as represented by their TSNs. 364 */ 365 366 struct sctp_gap_ack_block { 367 __be16 start; 368 __be16 end; 369 }; 370 371 union sctp_sack_variable { 372 struct sctp_gap_ack_block gab; 373 __be32 dup; 374 }; 375 376 struct sctp_sackhdr { 377 __be32 cum_tsn_ack; 378 __be32 a_rwnd; 379 __be16 num_gap_ack_blocks; 380 __be16 num_dup_tsns; 381 union sctp_sack_variable variable[0]; 382 }; 383 384 struct sctp_sack_chunk { 385 struct sctp_chunkhdr chunk_hdr; 386 struct sctp_sackhdr sack_hdr; 387 }; 388 389 390 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 391 * 392 * An endpoint should send this chunk to its peer endpoint to probe the 393 * reachability of a particular destination transport address defined in 394 * the present association. 395 */ 396 397 struct sctp_heartbeathdr { 398 struct sctp_paramhdr info; 399 }; 400 401 struct sctp_heartbeat_chunk { 402 struct sctp_chunkhdr chunk_hdr; 403 struct sctp_heartbeathdr hb_hdr; 404 }; 405 406 407 /* For the abort and shutdown ACK we must carry the init tag in the 408 * common header. Just the common header is all that is needed with a 409 * chunk descriptor. 410 */ 411 struct sctp_abort_chunk { 412 struct sctp_chunkhdr uh; 413 }; 414 415 416 /* For the graceful shutdown we must carry the tag (in common header) 417 * and the highest consecutive acking value. 418 */ 419 typedef struct sctp_shutdownhdr { 420 __be32 cum_tsn_ack; 421 } sctp_shutdownhdr_t; 422 423 struct sctp_shutdown_chunk_t { 424 struct sctp_chunkhdr chunk_hdr; 425 sctp_shutdownhdr_t shutdown_hdr; 426 }; 427 428 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 429 430 typedef struct sctp_errhdr { 431 __be16 cause; 432 __be16 length; 433 __u8 variable[0]; 434 } sctp_errhdr_t; 435 436 typedef struct sctp_operr_chunk { 437 struct sctp_chunkhdr chunk_hdr; 438 sctp_errhdr_t err_hdr; 439 } sctp_operr_chunk_t; 440 441 /* RFC 2960 3.3.10 - Operation Error 442 * 443 * Cause Code: 16 bits (unsigned integer) 444 * 445 * Defines the type of error conditions being reported. 446 * Cause Code 447 * Value Cause Code 448 * --------- ---------------- 449 * 1 Invalid Stream Identifier 450 * 2 Missing Mandatory Parameter 451 * 3 Stale Cookie Error 452 * 4 Out of Resource 453 * 5 Unresolvable Address 454 * 6 Unrecognized Chunk Type 455 * 7 Invalid Mandatory Parameter 456 * 8 Unrecognized Parameters 457 * 9 No User Data 458 * 10 Cookie Received While Shutting Down 459 */ 460 typedef enum { 461 462 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 463 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 464 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 465 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 466 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 467 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 468 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 469 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 470 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 471 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 472 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 473 474 475 /* SCTP Implementation Guide: 476 * 11 Restart of an association with new addresses 477 * 12 User Initiated Abort 478 * 13 Protocol Violation 479 */ 480 481 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 482 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 483 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 484 485 /* ADDIP Section 3.3 New Error Causes 486 * 487 * Four new Error Causes are added to the SCTP Operational Errors, 488 * primarily for use in the ASCONF-ACK chunk. 489 * 490 * Value Cause Code 491 * --------- ---------------- 492 * 0x00A0 Request to Delete Last Remaining IP Address. 493 * 0x00A1 Operation Refused Due to Resource Shortage. 494 * 0x00A2 Request to Delete Source IP Address. 495 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 496 * 0x00A4 Request refused - no authorization. 497 */ 498 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 499 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 500 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 501 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 502 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 503 504 /* AUTH Section 4. New Error Cause 505 * 506 * This section defines a new error cause that will be sent if an AUTH 507 * chunk is received with an unsupported HMAC identifier. 508 * illustrates the new error cause. 509 * 510 * Cause Code Error Cause Name 511 * -------------------------------------------------------------- 512 * 0x0105 Unsupported HMAC Identifier 513 */ 514 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 515 } sctp_error_t; 516 517 518 519 /* RFC 2960. Appendix A. Explicit Congestion Notification. 520 * Explicit Congestion Notification Echo (ECNE) (12) 521 */ 522 typedef struct sctp_ecnehdr { 523 __be32 lowest_tsn; 524 } sctp_ecnehdr_t; 525 526 typedef struct sctp_ecne_chunk { 527 struct sctp_chunkhdr chunk_hdr; 528 sctp_ecnehdr_t ence_hdr; 529 } sctp_ecne_chunk_t; 530 531 /* RFC 2960. Appendix A. Explicit Congestion Notification. 532 * Congestion Window Reduced (CWR) (13) 533 */ 534 typedef struct sctp_cwrhdr { 535 __be32 lowest_tsn; 536 } sctp_cwrhdr_t; 537 538 typedef struct sctp_cwr_chunk { 539 struct sctp_chunkhdr chunk_hdr; 540 sctp_cwrhdr_t cwr_hdr; 541 } sctp_cwr_chunk_t; 542 543 /* PR-SCTP 544 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 545 * 546 * Forward Cumulative TSN chunk has the following format: 547 * 548 * 0 1 2 3 549 * 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 1 550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 551 * | Type = 192 | Flags = 0x00 | Length = Variable | 552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 553 * | New Cumulative TSN | 554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 555 * | Stream-1 | Stream Sequence-1 | 556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 557 * \ / 558 * / \ 559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 560 * | Stream-N | Stream Sequence-N | 561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 562 * 563 * Chunk Flags: 564 * 565 * Set to all zeros on transmit and ignored on receipt. 566 * 567 * New Cumulative TSN: 32 bit u_int 568 * 569 * This indicates the new cumulative TSN to the data receiver. Upon 570 * the reception of this value, the data receiver MUST consider 571 * any missing TSNs earlier than or equal to this value as received 572 * and stop reporting them as gaps in any subsequent SACKs. 573 * 574 * Stream-N: 16 bit u_int 575 * 576 * This field holds a stream number that was skipped by this 577 * FWD-TSN. 578 * 579 * Stream Sequence-N: 16 bit u_int 580 * This field holds the sequence number associated with the stream 581 * that was skipped. The stream sequence field holds the largest stream 582 * sequence number in this stream being skipped. The receiver of 583 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 584 * to enable delivery of any stranded TSN's that remain on the stream 585 * re-ordering queues. This field MUST NOT report TSN's corresponding 586 * to DATA chunk that are marked as unordered. For ordered DATA 587 * chunks this field MUST be filled in. 588 */ 589 struct sctp_fwdtsn_skip { 590 __be16 stream; 591 __be16 ssn; 592 }; 593 594 struct sctp_fwdtsn_hdr { 595 __be32 new_cum_tsn; 596 struct sctp_fwdtsn_skip skip[0]; 597 }; 598 599 struct sctp_fwdtsn_chunk { 600 struct sctp_chunkhdr chunk_hdr; 601 struct sctp_fwdtsn_hdr fwdtsn_hdr; 602 }; 603 604 605 /* ADDIP 606 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 607 * 608 * Serial Number: 32 bits (unsigned integer) 609 * This value represents a Serial Number for the ASCONF Chunk. The 610 * valid range of Serial Number is from 0 to 2^32-1. 611 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 612 * 613 * Address Parameter: 8 or 20 bytes (depending on type) 614 * The address is an address of the sender of the ASCONF chunk, 615 * the address MUST be considered part of the association by the 616 * peer endpoint. This field may be used by the receiver of the 617 * ASCONF to help in finding the association. This parameter MUST 618 * be present in every ASCONF message i.e. it is a mandatory TLV 619 * parameter. 620 * 621 * ASCONF Parameter: TLV format 622 * Each Address configuration change is represented by a TLV 623 * parameter as defined in Section 3.2. One or more requests may 624 * be present in an ASCONF Chunk. 625 * 626 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 627 * 628 * Serial Number: 32 bits (unsigned integer) 629 * This value represents the Serial Number for the received ASCONF 630 * Chunk that is acknowledged by this chunk. This value is copied 631 * from the received ASCONF Chunk. 632 * 633 * ASCONF Parameter Response: TLV format 634 * The ASCONF Parameter Response is used in the ASCONF-ACK to 635 * report status of ASCONF processing. 636 */ 637 typedef struct sctp_addip_param { 638 struct sctp_paramhdr param_hdr; 639 __be32 crr_id; 640 } sctp_addip_param_t; 641 642 typedef struct sctp_addiphdr { 643 __be32 serial; 644 __u8 params[0]; 645 } sctp_addiphdr_t; 646 647 typedef struct sctp_addip_chunk { 648 struct sctp_chunkhdr chunk_hdr; 649 sctp_addiphdr_t addip_hdr; 650 } sctp_addip_chunk_t; 651 652 /* AUTH 653 * Section 4.1 Authentication Chunk (AUTH) 654 * 655 * This chunk is used to hold the result of the HMAC calculation. 656 * 657 * 0 1 2 3 658 * 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 1 659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 660 * | Type = 0x0F | Flags=0 | Length | 661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 662 * | Shared Key Identifier | HMAC Identifier | 663 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 664 * | | 665 * \ HMAC / 666 * / \ 667 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 668 * 669 * Type: 1 byte (unsigned integer) 670 * This value MUST be set to 0x0F for all AUTH-chunks. 671 * 672 * Flags: 1 byte (unsigned integer) 673 * Set to zero on transmit and ignored on receipt. 674 * 675 * Length: 2 bytes (unsigned integer) 676 * This value holds the length of the HMAC in bytes plus 8. 677 * 678 * Shared Key Identifier: 2 bytes (unsigned integer) 679 * This value describes which endpoint pair shared key is used. 680 * 681 * HMAC Identifier: 2 bytes (unsigned integer) 682 * This value describes which message digest is being used. Table 2 683 * shows the currently defined values. 684 * 685 * The following Table 2 shows the currently defined values for HMAC 686 * identifiers. 687 * 688 * +-----------------+--------------------------+ 689 * | HMAC Identifier | Message Digest Algorithm | 690 * +-----------------+--------------------------+ 691 * | 0 | Reserved | 692 * | 1 | SHA-1 defined in [8] | 693 * | 2 | Reserved | 694 * | 3 | SHA-256 defined in [8] | 695 * +-----------------+--------------------------+ 696 * 697 * 698 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 699 * calculation. 700 */ 701 typedef struct sctp_authhdr { 702 __be16 shkey_id; 703 __be16 hmac_id; 704 __u8 hmac[0]; 705 } sctp_authhdr_t; 706 707 typedef struct sctp_auth_chunk { 708 struct sctp_chunkhdr chunk_hdr; 709 sctp_authhdr_t auth_hdr; 710 } sctp_auth_chunk_t; 711 712 struct sctp_infox { 713 struct sctp_info *sctpinfo; 714 struct sctp_association *asoc; 715 }; 716 717 struct sctp_reconf_chunk { 718 struct sctp_chunkhdr chunk_hdr; 719 __u8 params[0]; 720 }; 721 722 struct sctp_strreset_outreq { 723 struct sctp_paramhdr param_hdr; 724 __u32 request_seq; 725 __u32 response_seq; 726 __u32 send_reset_at_tsn; 727 __u16 list_of_streams[0]; 728 }; 729 730 struct sctp_strreset_inreq { 731 struct sctp_paramhdr param_hdr; 732 __u32 request_seq; 733 __u16 list_of_streams[0]; 734 }; 735 736 struct sctp_strreset_tsnreq { 737 struct sctp_paramhdr param_hdr; 738 __u32 request_seq; 739 }; 740 741 struct sctp_strreset_addstrm { 742 struct sctp_paramhdr param_hdr; 743 __u32 request_seq; 744 __u16 number_of_streams; 745 __u16 reserved; 746 }; 747 748 enum { 749 SCTP_STRRESET_NOTHING_TO_DO = 0x00, 750 SCTP_STRRESET_PERFORMED = 0x01, 751 SCTP_STRRESET_DENIED = 0x02, 752 SCTP_STRRESET_ERR_WRONG_SSN = 0x03, 753 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04, 754 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05, 755 SCTP_STRRESET_IN_PROGRESS = 0x06, 756 }; 757 758 struct sctp_strreset_resp { 759 struct sctp_paramhdr param_hdr; 760 __u32 response_seq; 761 __u32 result; 762 }; 763 764 struct sctp_strreset_resptsn { 765 struct sctp_paramhdr param_hdr; 766 __u32 response_seq; 767 __u32 result; 768 __u32 senders_next_tsn; 769 __u32 receivers_next_tsn; 770 }; 771 772 #endif /* __LINUX_SCTP_H__ */ 773