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 */ 59 typedef struct sctphdr { 60 __be16 source; 61 __be16 dest; 62 __be32 vtag; 63 __le32 checksum; 64 } __packed sctp_sctphdr_t; 65 66 #ifdef __KERNEL__ 67 #include <linux/skbuff.h> 68 69 static 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. */ 76 typedef struct sctp_chunkhdr { 77 __u8 type; 78 __u8 flags; 79 __be16 length; 80 } __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 */ 88 typedef 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 */ 122 typedef 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; 128 129 enum { 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 */ 137 enum { 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 */ 166 167 typedef struct sctp_paramhdr { 168 __be16 type; 169 __be16 length; 170 } __packed sctp_paramhdr_t; 171 172 typedef 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 */ 214 typedef 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; 220 221 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), }; 222 223 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ 224 225 typedef struct sctp_datahdr { 226 __be32 tsn; 227 __be16 stream; 228 __be16 ssn; 229 __be32 ppid; 230 __u8 payload[0]; 231 } __packed sctp_datahdr_t; 232 233 typedef struct sctp_data_chunk { 234 sctp_chunkhdr_t chunk_hdr; 235 sctp_datahdr_t data_hdr; 236 } __packed sctp_data_chunk_t; 237 238 /* DATA Chuck Specific Flags */ 239 enum { 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 SCTP_DATA_SACK_IMM = 0x08, 246 }; 247 enum { SCTP_DATA_FRAG_MASK = 0x03, }; 248 249 250 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 251 * 252 * This chunk is used to initiate a SCTP association between two 253 * endpoints. 254 */ 255 typedef struct sctp_inithdr { 256 __be32 init_tag; 257 __be32 a_rwnd; 258 __be16 num_outbound_streams; 259 __be16 num_inbound_streams; 260 __be32 initial_tsn; 261 __u8 params[0]; 262 } __packed sctp_inithdr_t; 263 264 typedef struct sctp_init_chunk { 265 sctp_chunkhdr_t chunk_hdr; 266 sctp_inithdr_t init_hdr; 267 } __packed sctp_init_chunk_t; 268 269 270 /* Section 3.3.2.1. IPv4 Address Parameter (5) */ 271 typedef struct sctp_ipv4addr_param { 272 sctp_paramhdr_t param_hdr; 273 struct in_addr addr; 274 } __packed sctp_ipv4addr_param_t; 275 276 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ 277 typedef struct sctp_ipv6addr_param { 278 sctp_paramhdr_t param_hdr; 279 struct in6_addr addr; 280 } __packed sctp_ipv6addr_param_t; 281 282 /* Section 3.3.2.1 Cookie Preservative (9) */ 283 typedef struct sctp_cookie_preserve_param { 284 sctp_paramhdr_t param_hdr; 285 __be32 lifespan_increment; 286 } __packed sctp_cookie_preserve_param_t; 287 288 /* Section 3.3.2.1 Host Name Address (11) */ 289 typedef struct sctp_hostname_param { 290 sctp_paramhdr_t param_hdr; 291 uint8_t hostname[0]; 292 } __packed sctp_hostname_param_t; 293 294 /* Section 3.3.2.1 Supported Address Types (12) */ 295 typedef struct sctp_supported_addrs_param { 296 sctp_paramhdr_t param_hdr; 297 __be16 types[0]; 298 } __packed sctp_supported_addrs_param_t; 299 300 /* Appendix A. ECN Capable (32768) */ 301 typedef struct sctp_ecn_capable_param { 302 sctp_paramhdr_t param_hdr; 303 } __packed sctp_ecn_capable_param_t; 304 305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */ 306 typedef struct sctp_adaptation_ind_param { 307 struct sctp_paramhdr param_hdr; 308 __be32 adaptation_ind; 309 } __packed sctp_adaptation_ind_param_t; 310 311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */ 312 typedef struct sctp_supported_ext_param { 313 struct sctp_paramhdr param_hdr; 314 __u8 chunks[0]; 315 } __packed sctp_supported_ext_param_t; 316 317 /* AUTH Section 3.1 Random */ 318 typedef struct sctp_random_param { 319 sctp_paramhdr_t param_hdr; 320 __u8 random_val[0]; 321 } __packed sctp_random_param_t; 322 323 /* AUTH Section 3.2 Chunk List */ 324 typedef struct sctp_chunks_param { 325 sctp_paramhdr_t param_hdr; 326 __u8 chunks[0]; 327 } __packed sctp_chunks_param_t; 328 329 /* AUTH Section 3.3 HMAC Algorithm */ 330 typedef struct sctp_hmac_algo_param { 331 sctp_paramhdr_t param_hdr; 332 __be16 hmac_ids[0]; 333 } __packed sctp_hmac_algo_param_t; 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 typedef sctp_init_chunk_t sctp_initack_chunk_t; 340 341 /* Section 3.3.3.1 State Cookie (7) */ 342 typedef struct sctp_cookie_param { 343 sctp_paramhdr_t p; 344 __u8 body[0]; 345 } __packed sctp_cookie_param_t; 346 347 /* Section 3.3.3.1 Unrecognized Parameters (8) */ 348 typedef struct sctp_unrecognized_param { 349 sctp_paramhdr_t param_hdr; 350 sctp_paramhdr_t unrecognized; 351 } __packed sctp_unrecognized_param_t; 352 353 354 355 /* 356 * 3.3.4 Selective Acknowledgement (SACK) (3): 357 * 358 * This chunk is sent to the peer endpoint to acknowledge received DATA 359 * chunks and to inform the peer endpoint of gaps in the received 360 * subsequences of DATA chunks as represented by their TSNs. 361 */ 362 363 typedef struct sctp_gap_ack_block { 364 __be16 start; 365 __be16 end; 366 } __packed sctp_gap_ack_block_t; 367 368 typedef __be32 sctp_dup_tsn_t; 369 370 typedef union { 371 sctp_gap_ack_block_t gab; 372 sctp_dup_tsn_t dup; 373 } sctp_sack_variable_t; 374 375 typedef struct sctp_sackhdr { 376 __be32 cum_tsn_ack; 377 __be32 a_rwnd; 378 __be16 num_gap_ack_blocks; 379 __be16 num_dup_tsns; 380 sctp_sack_variable_t variable[0]; 381 } __packed sctp_sackhdr_t; 382 383 typedef struct sctp_sack_chunk { 384 sctp_chunkhdr_t chunk_hdr; 385 sctp_sackhdr_t sack_hdr; 386 } __packed sctp_sack_chunk_t; 387 388 389 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 390 * 391 * An endpoint should send this chunk to its peer endpoint to probe the 392 * reachability of a particular destination transport address defined in 393 * the present association. 394 */ 395 396 typedef struct sctp_heartbeathdr { 397 sctp_paramhdr_t info; 398 } __packed sctp_heartbeathdr_t; 399 400 typedef struct sctp_heartbeat_chunk { 401 sctp_chunkhdr_t chunk_hdr; 402 sctp_heartbeathdr_t hb_hdr; 403 } __packed sctp_heartbeat_chunk_t; 404 405 406 /* For the abort and shutdown ACK we must carry the init tag in the 407 * common header. Just the common header is all that is needed with a 408 * chunk descriptor. 409 */ 410 typedef struct sctp_abort_chunk { 411 sctp_chunkhdr_t uh; 412 } __packed sctp_abort_chunk_t; 413 414 415 /* For the graceful shutdown we must carry the tag (in common header) 416 * and the highest consecutive acking value. 417 */ 418 typedef struct sctp_shutdownhdr { 419 __be32 cum_tsn_ack; 420 } __packed sctp_shutdownhdr_t; 421 422 struct sctp_shutdown_chunk_t { 423 sctp_chunkhdr_t chunk_hdr; 424 sctp_shutdownhdr_t shutdown_hdr; 425 } __packed; 426 427 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 428 429 typedef struct sctp_errhdr { 430 __be16 cause; 431 __be16 length; 432 __u8 variable[0]; 433 } __packed sctp_errhdr_t; 434 435 typedef struct sctp_operr_chunk { 436 sctp_chunkhdr_t chunk_hdr; 437 sctp_errhdr_t err_hdr; 438 } __packed sctp_operr_chunk_t; 439 440 /* RFC 2960 3.3.10 - Operation Error 441 * 442 * Cause Code: 16 bits (unsigned integer) 443 * 444 * Defines the type of error conditions being reported. 445 * Cause Code 446 * Value Cause Code 447 * --------- ---------------- 448 * 1 Invalid Stream Identifier 449 * 2 Missing Mandatory Parameter 450 * 3 Stale Cookie Error 451 * 4 Out of Resource 452 * 5 Unresolvable Address 453 * 6 Unrecognized Chunk Type 454 * 7 Invalid Mandatory Parameter 455 * 8 Unrecognized Parameters 456 * 9 No User Data 457 * 10 Cookie Received While Shutting Down 458 */ 459 typedef enum { 460 461 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 462 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 463 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 464 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 465 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 466 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 467 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 468 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 469 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 470 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 471 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 472 473 474 /* SCTP Implementation Guide: 475 * 11 Restart of an association with new addresses 476 * 12 User Initiated Abort 477 * 13 Protocol Violation 478 */ 479 480 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 481 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 482 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 483 484 /* ADDIP Section 3.3 New Error Causes 485 * 486 * Four new Error Causes are added to the SCTP Operational Errors, 487 * primarily for use in the ASCONF-ACK chunk. 488 * 489 * Value Cause Code 490 * --------- ---------------- 491 * 0x00A0 Request to Delete Last Remaining IP Address. 492 * 0x00A1 Operation Refused Due to Resource Shortage. 493 * 0x00A2 Request to Delete Source IP Address. 494 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 495 * 0x00A4 Request refused - no authorization. 496 */ 497 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 498 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 499 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 500 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 501 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 502 503 /* AUTH Section 4. New Error Cause 504 * 505 * This section defines a new error cause that will be sent if an AUTH 506 * chunk is received with an unsupported HMAC identifier. 507 * illustrates the new error cause. 508 * 509 * Cause Code Error Cause Name 510 * -------------------------------------------------------------- 511 * 0x0105 Unsupported HMAC Identifier 512 */ 513 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 514 } sctp_error_t; 515 516 517 518 /* RFC 2960. Appendix A. Explicit Congestion Notification. 519 * Explicit Congestion Notification Echo (ECNE) (12) 520 */ 521 typedef struct sctp_ecnehdr { 522 __be32 lowest_tsn; 523 } sctp_ecnehdr_t; 524 525 typedef struct sctp_ecne_chunk { 526 sctp_chunkhdr_t chunk_hdr; 527 sctp_ecnehdr_t ence_hdr; 528 } __packed sctp_ecne_chunk_t; 529 530 /* RFC 2960. Appendix A. Explicit Congestion Notification. 531 * Congestion Window Reduced (CWR) (13) 532 */ 533 typedef struct sctp_cwrhdr { 534 __be32 lowest_tsn; 535 } sctp_cwrhdr_t; 536 537 typedef struct sctp_cwr_chunk { 538 sctp_chunkhdr_t chunk_hdr; 539 sctp_cwrhdr_t cwr_hdr; 540 } __packed sctp_cwr_chunk_t; 541 542 /* PR-SCTP 543 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 544 * 545 * Forward Cumulative TSN chunk has the following format: 546 * 547 * 0 1 2 3 548 * 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 1 549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 550 * | Type = 192 | Flags = 0x00 | Length = Variable | 551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 552 * | New Cumulative TSN | 553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 554 * | Stream-1 | Stream Sequence-1 | 555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 556 * \ / 557 * / \ 558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 559 * | Stream-N | Stream Sequence-N | 560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 561 * 562 * Chunk Flags: 563 * 564 * Set to all zeros on transmit and ignored on receipt. 565 * 566 * New Cumulative TSN: 32 bit u_int 567 * 568 * This indicates the new cumulative TSN to the data receiver. Upon 569 * the reception of this value, the data receiver MUST consider 570 * any missing TSNs earlier than or equal to this value as received 571 * and stop reporting them as gaps in any subsequent SACKs. 572 * 573 * Stream-N: 16 bit u_int 574 * 575 * This field holds a stream number that was skipped by this 576 * FWD-TSN. 577 * 578 * Stream Sequence-N: 16 bit u_int 579 * This field holds the sequence number associated with the stream 580 * that was skipped. The stream sequence field holds the largest stream 581 * sequence number in this stream being skipped. The receiver of 582 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 583 * to enable delivery of any stranded TSN's that remain on the stream 584 * re-ordering queues. This field MUST NOT report TSN's corresponding 585 * to DATA chunk that are marked as unordered. For ordered DATA 586 * chunks this field MUST be filled in. 587 */ 588 struct sctp_fwdtsn_skip { 589 __be16 stream; 590 __be16 ssn; 591 } __packed; 592 593 struct sctp_fwdtsn_hdr { 594 __be32 new_cum_tsn; 595 struct sctp_fwdtsn_skip skip[0]; 596 } __packed; 597 598 struct sctp_fwdtsn_chunk { 599 struct sctp_chunkhdr chunk_hdr; 600 struct sctp_fwdtsn_hdr fwdtsn_hdr; 601 } __packed; 602 603 604 /* ADDIP 605 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 606 * 607 * Serial Number: 32 bits (unsigned integer) 608 * This value represents a Serial Number for the ASCONF Chunk. The 609 * valid range of Serial Number is from 0 to 2^32-1. 610 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 611 * 612 * Address Parameter: 8 or 20 bytes (depending on type) 613 * The address is an address of the sender of the ASCONF chunk, 614 * the address MUST be considered part of the association by the 615 * peer endpoint. This field may be used by the receiver of the 616 * ASCONF to help in finding the association. This parameter MUST 617 * be present in every ASCONF message i.e. it is a mandatory TLV 618 * parameter. 619 * 620 * ASCONF Parameter: TLV format 621 * Each Address configuration change is represented by a TLV 622 * parameter as defined in Section 3.2. One or more requests may 623 * be present in an ASCONF Chunk. 624 * 625 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 626 * 627 * Serial Number: 32 bits (unsigned integer) 628 * This value represents the Serial Number for the received ASCONF 629 * Chunk that is acknowledged by this chunk. This value is copied 630 * from the received ASCONF Chunk. 631 * 632 * ASCONF Parameter Response: TLV format 633 * The ASCONF Parameter Response is used in the ASCONF-ACK to 634 * report status of ASCONF processing. 635 */ 636 typedef struct sctp_addip_param { 637 sctp_paramhdr_t param_hdr; 638 __be32 crr_id; 639 } __packed sctp_addip_param_t; 640 641 typedef struct sctp_addiphdr { 642 __be32 serial; 643 __u8 params[0]; 644 } __packed sctp_addiphdr_t; 645 646 typedef struct sctp_addip_chunk { 647 sctp_chunkhdr_t chunk_hdr; 648 sctp_addiphdr_t addip_hdr; 649 } __packed sctp_addip_chunk_t; 650 651 /* AUTH 652 * Section 4.1 Authentication Chunk (AUTH) 653 * 654 * This chunk is used to hold the result of the HMAC calculation. 655 * 656 * 0 1 2 3 657 * 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 1 658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 659 * | Type = 0x0F | Flags=0 | Length | 660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 661 * | Shared Key Identifier | HMAC Identifier | 662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 663 * | | 664 * \ HMAC / 665 * / \ 666 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 667 * 668 * Type: 1 byte (unsigned integer) 669 * This value MUST be set to 0x0F for all AUTH-chunks. 670 * 671 * Flags: 1 byte (unsigned integer) 672 * Set to zero on transmit and ignored on receipt. 673 * 674 * Length: 2 bytes (unsigned integer) 675 * This value holds the length of the HMAC in bytes plus 8. 676 * 677 * Shared Key Identifier: 2 bytes (unsigned integer) 678 * This value describes which endpoint pair shared key is used. 679 * 680 * HMAC Identifier: 2 bytes (unsigned integer) 681 * This value describes which message digest is being used. Table 2 682 * shows the currently defined values. 683 * 684 * The following Table 2 shows the currently defined values for HMAC 685 * identifiers. 686 * 687 * +-----------------+--------------------------+ 688 * | HMAC Identifier | Message Digest Algorithm | 689 * +-----------------+--------------------------+ 690 * | 0 | Reserved | 691 * | 1 | SHA-1 defined in [8] | 692 * | 2 | Reserved | 693 * | 3 | SHA-256 defined in [8] | 694 * +-----------------+--------------------------+ 695 * 696 * 697 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 698 * calculation. 699 */ 700 typedef struct sctp_authhdr { 701 __be16 shkey_id; 702 __be16 hmac_id; 703 __u8 hmac[0]; 704 } __packed sctp_authhdr_t; 705 706 typedef struct sctp_auth_chunk { 707 sctp_chunkhdr_t chunk_hdr; 708 sctp_authhdr_t auth_hdr; 709 } __packed sctp_auth_chunk_t; 710 711 #endif /* __LINUX_SCTP_H__ */ 712