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 */ 45 struct sctphdr { 46 __be16 source; 47 __be16 dest; 48 __be32 vtag; 49 __le32 checksum; 50 }; 51 52 static 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. */ 58 struct 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 */ 70 enum 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 */ 110 enum { 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 }; 116 117 enum { 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 */ 125 enum { 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 */ 154 155 struct sctp_paramhdr { 156 __be16 type; 157 __be16 length; 158 }; 159 160 enum 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 */ 209 enum { 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 }; 215 216 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), }; 217 218 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ 219 220 struct sctp_datahdr { 221 __be32 tsn; 222 __be16 stream; 223 __be16 ssn; 224 __u32 ppid; 225 }; 226 227 struct sctp_data_chunk { 228 struct sctp_chunkhdr chunk_hdr; 229 struct sctp_datahdr data_hdr; 230 }; 231 232 struct sctp_idatahdr { 233 __be32 tsn; 234 __be16 stream; 235 __be16 reserved; 236 __be32 mid; 237 union { 238 __u32 ppid; 239 __be32 fsn; 240 }; 241 __u8 payload[0]; 242 }; 243 244 struct sctp_idata_chunk { 245 struct sctp_chunkhdr chunk_hdr; 246 struct sctp_idatahdr data_hdr; 247 }; 248 249 /* DATA Chuck Specific Flags */ 250 enum { 251 SCTP_DATA_MIDDLE_FRAG = 0x00, 252 SCTP_DATA_LAST_FRAG = 0x01, 253 SCTP_DATA_FIRST_FRAG = 0x02, 254 SCTP_DATA_NOT_FRAG = 0x03, 255 SCTP_DATA_UNORDERED = 0x04, 256 SCTP_DATA_SACK_IMM = 0x08, 257 }; 258 enum { SCTP_DATA_FRAG_MASK = 0x03, }; 259 260 261 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 262 * 263 * This chunk is used to initiate a SCTP association between two 264 * endpoints. 265 */ 266 struct sctp_inithdr { 267 __be32 init_tag; 268 __be32 a_rwnd; 269 __be16 num_outbound_streams; 270 __be16 num_inbound_streams; 271 __be32 initial_tsn; 272 /* __u8 params[]; */ 273 }; 274 275 struct sctp_init_chunk { 276 struct sctp_chunkhdr chunk_hdr; 277 struct sctp_inithdr init_hdr; 278 }; 279 280 281 /* Section 3.3.2.1. IPv4 Address Parameter (5) */ 282 struct sctp_ipv4addr_param { 283 struct sctp_paramhdr param_hdr; 284 struct in_addr addr; 285 }; 286 287 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ 288 struct sctp_ipv6addr_param { 289 struct sctp_paramhdr param_hdr; 290 struct in6_addr addr; 291 }; 292 293 /* Section 3.3.2.1 Cookie Preservative (9) */ 294 struct sctp_cookie_preserve_param { 295 struct sctp_paramhdr param_hdr; 296 __be32 lifespan_increment; 297 }; 298 299 /* Section 3.3.2.1 Host Name Address (11) */ 300 struct sctp_hostname_param { 301 struct sctp_paramhdr param_hdr; 302 uint8_t hostname[]; 303 }; 304 305 /* Section 3.3.2.1 Supported Address Types (12) */ 306 struct sctp_supported_addrs_param { 307 struct sctp_paramhdr param_hdr; 308 __be16 types[]; 309 }; 310 311 /* ADDIP Section 3.2.6 Adaptation Layer Indication */ 312 struct sctp_adaptation_ind_param { 313 struct sctp_paramhdr param_hdr; 314 __be32 adaptation_ind; 315 }; 316 317 /* ADDIP Section 4.2.7 Supported Extensions Parameter */ 318 struct sctp_supported_ext_param { 319 struct sctp_paramhdr param_hdr; 320 __u8 chunks[]; 321 }; 322 323 /* AUTH Section 3.1 Random */ 324 struct sctp_random_param { 325 struct sctp_paramhdr param_hdr; 326 __u8 random_val[]; 327 }; 328 329 /* AUTH Section 3.2 Chunk List */ 330 struct sctp_chunks_param { 331 struct sctp_paramhdr param_hdr; 332 __u8 chunks[]; 333 }; 334 335 /* AUTH Section 3.3 HMAC Algorithm */ 336 struct sctp_hmac_algo_param { 337 struct sctp_paramhdr param_hdr; 338 __be16 hmac_ids[]; 339 }; 340 341 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): 342 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP 343 * association. 344 */ 345 struct sctp_initack_chunk { 346 struct sctp_chunkhdr chunk_hdr; 347 struct sctp_inithdr init_hdr; 348 }; 349 350 /* Section 3.3.3.1 State Cookie (7) */ 351 struct sctp_cookie_param { 352 struct sctp_paramhdr p; 353 __u8 body[]; 354 }; 355 356 /* Section 3.3.3.1 Unrecognized Parameters (8) */ 357 struct sctp_unrecognized_param { 358 struct sctp_paramhdr param_hdr; 359 struct sctp_paramhdr unrecognized; 360 }; 361 362 363 364 /* 365 * 3.3.4 Selective Acknowledgement (SACK) (3): 366 * 367 * This chunk is sent to the peer endpoint to acknowledge received DATA 368 * chunks and to inform the peer endpoint of gaps in the received 369 * subsequences of DATA chunks as represented by their TSNs. 370 */ 371 372 struct sctp_gap_ack_block { 373 __be16 start; 374 __be16 end; 375 }; 376 377 union sctp_sack_variable { 378 struct sctp_gap_ack_block gab; 379 __be32 dup; 380 }; 381 382 struct sctp_sackhdr { 383 __be32 cum_tsn_ack; 384 __be32 a_rwnd; 385 __be16 num_gap_ack_blocks; 386 __be16 num_dup_tsns; 387 /* union sctp_sack_variable variable[]; */ 388 }; 389 390 struct sctp_sack_chunk { 391 struct sctp_chunkhdr chunk_hdr; 392 struct sctp_sackhdr sack_hdr; 393 }; 394 395 396 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 397 * 398 * An endpoint should send this chunk to its peer endpoint to probe the 399 * reachability of a particular destination transport address defined in 400 * the present association. 401 */ 402 403 struct sctp_heartbeathdr { 404 struct sctp_paramhdr info; 405 }; 406 407 struct sctp_heartbeat_chunk { 408 struct sctp_chunkhdr chunk_hdr; 409 struct sctp_heartbeathdr hb_hdr; 410 }; 411 412 413 /* PAD chunk could be bundled with heartbeat chunk to probe pmtu */ 414 struct sctp_pad_chunk { 415 struct sctp_chunkhdr uh; 416 }; 417 418 419 /* For the abort and shutdown ACK we must carry the init tag in the 420 * common header. Just the common header is all that is needed with a 421 * chunk descriptor. 422 */ 423 struct sctp_abort_chunk { 424 struct sctp_chunkhdr uh; 425 }; 426 427 428 /* For the graceful shutdown we must carry the tag (in common header) 429 * and the highest consecutive acking value. 430 */ 431 struct sctp_shutdownhdr { 432 __be32 cum_tsn_ack; 433 }; 434 435 struct sctp_shutdown_chunk { 436 struct sctp_chunkhdr chunk_hdr; 437 struct sctp_shutdownhdr shutdown_hdr; 438 }; 439 440 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 441 442 struct sctp_errhdr { 443 __be16 cause; 444 __be16 length; 445 /* __u8 variable[]; */ 446 }; 447 448 struct sctp_operr_chunk { 449 struct sctp_chunkhdr chunk_hdr; 450 struct sctp_errhdr err_hdr; 451 }; 452 453 /* RFC 2960 3.3.10 - Operation Error 454 * 455 * Cause Code: 16 bits (unsigned integer) 456 * 457 * Defines the type of error conditions being reported. 458 * Cause Code 459 * Value Cause Code 460 * --------- ---------------- 461 * 1 Invalid Stream Identifier 462 * 2 Missing Mandatory Parameter 463 * 3 Stale Cookie Error 464 * 4 Out of Resource 465 * 5 Unresolvable Address 466 * 6 Unrecognized Chunk Type 467 * 7 Invalid Mandatory Parameter 468 * 8 Unrecognized Parameters 469 * 9 No User Data 470 * 10 Cookie Received While Shutting Down 471 */ 472 enum sctp_error { 473 474 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00), 475 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01), 476 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02), 477 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03), 478 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04), 479 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05), 480 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06), 481 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07), 482 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08), 483 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09), 484 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a), 485 486 487 /* SCTP Implementation Guide: 488 * 11 Restart of an association with new addresses 489 * 12 User Initiated Abort 490 * 13 Protocol Violation 491 * 14 Restart of an Association with New Encapsulation Port 492 */ 493 494 SCTP_ERROR_RESTART = cpu_to_be16(0x0b), 495 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), 496 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), 497 SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e), 498 499 /* ADDIP Section 3.3 New Error Causes 500 * 501 * Four new Error Causes are added to the SCTP Operational Errors, 502 * primarily for use in the ASCONF-ACK chunk. 503 * 504 * Value Cause Code 505 * --------- ---------------- 506 * 0x00A0 Request to Delete Last Remaining IP Address. 507 * 0x00A1 Operation Refused Due to Resource Shortage. 508 * 0x00A2 Request to Delete Source IP Address. 509 * 0x00A3 Association Aborted due to illegal ASCONF-ACK 510 * 0x00A4 Request refused - no authorization. 511 */ 512 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0), 513 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1), 514 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2), 515 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3), 516 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4), 517 518 /* AUTH Section 4. New Error Cause 519 * 520 * This section defines a new error cause that will be sent if an AUTH 521 * chunk is received with an unsupported HMAC identifier. 522 * illustrates the new error cause. 523 * 524 * Cause Code Error Cause Name 525 * -------------------------------------------------------------- 526 * 0x0105 Unsupported HMAC Identifier 527 */ 528 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105) 529 }; 530 531 532 533 /* RFC 2960. Appendix A. Explicit Congestion Notification. 534 * Explicit Congestion Notification Echo (ECNE) (12) 535 */ 536 struct sctp_ecnehdr { 537 __be32 lowest_tsn; 538 }; 539 540 struct sctp_ecne_chunk { 541 struct sctp_chunkhdr chunk_hdr; 542 struct sctp_ecnehdr ence_hdr; 543 }; 544 545 /* RFC 2960. Appendix A. Explicit Congestion Notification. 546 * Congestion Window Reduced (CWR) (13) 547 */ 548 struct sctp_cwrhdr { 549 __be32 lowest_tsn; 550 }; 551 552 /* PR-SCTP 553 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 554 * 555 * Forward Cumulative TSN chunk has the following format: 556 * 557 * 0 1 2 3 558 * 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 1 559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 560 * | Type = 192 | Flags = 0x00 | Length = Variable | 561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 562 * | New Cumulative TSN | 563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 564 * | Stream-1 | Stream Sequence-1 | 565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 566 * \ / 567 * / \ 568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 569 * | Stream-N | Stream Sequence-N | 570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 571 * 572 * Chunk Flags: 573 * 574 * Set to all zeros on transmit and ignored on receipt. 575 * 576 * New Cumulative TSN: 32 bit u_int 577 * 578 * This indicates the new cumulative TSN to the data receiver. Upon 579 * the reception of this value, the data receiver MUST consider 580 * any missing TSNs earlier than or equal to this value as received 581 * and stop reporting them as gaps in any subsequent SACKs. 582 * 583 * Stream-N: 16 bit u_int 584 * 585 * This field holds a stream number that was skipped by this 586 * FWD-TSN. 587 * 588 * Stream Sequence-N: 16 bit u_int 589 * This field holds the sequence number associated with the stream 590 * that was skipped. The stream sequence field holds the largest stream 591 * sequence number in this stream being skipped. The receiver of 592 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 593 * to enable delivery of any stranded TSN's that remain on the stream 594 * re-ordering queues. This field MUST NOT report TSN's corresponding 595 * to DATA chunk that are marked as unordered. For ordered DATA 596 * chunks this field MUST be filled in. 597 */ 598 struct sctp_fwdtsn_skip { 599 __be16 stream; 600 __be16 ssn; 601 }; 602 603 struct sctp_fwdtsn_hdr { 604 __be32 new_cum_tsn; 605 /* struct sctp_fwdtsn_skip skip[]; */ 606 }; 607 608 struct sctp_fwdtsn_chunk { 609 struct sctp_chunkhdr chunk_hdr; 610 struct sctp_fwdtsn_hdr fwdtsn_hdr; 611 }; 612 613 struct sctp_ifwdtsn_skip { 614 __be16 stream; 615 __u8 reserved; 616 __u8 flags; 617 __be32 mid; 618 }; 619 620 struct sctp_ifwdtsn_hdr { 621 __be32 new_cum_tsn; 622 /* struct sctp_ifwdtsn_skip skip[]; */ 623 }; 624 625 struct sctp_ifwdtsn_chunk { 626 struct sctp_chunkhdr chunk_hdr; 627 struct sctp_ifwdtsn_hdr fwdtsn_hdr; 628 }; 629 630 /* ADDIP 631 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 632 * 633 * Serial Number: 32 bits (unsigned integer) 634 * This value represents a Serial Number for the ASCONF Chunk. The 635 * valid range of Serial Number is from 0 to 2^32-1. 636 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 637 * 638 * Address Parameter: 8 or 20 bytes (depending on type) 639 * The address is an address of the sender of the ASCONF chunk, 640 * the address MUST be considered part of the association by the 641 * peer endpoint. This field may be used by the receiver of the 642 * ASCONF to help in finding the association. This parameter MUST 643 * be present in every ASCONF message i.e. it is a mandatory TLV 644 * parameter. 645 * 646 * ASCONF Parameter: TLV format 647 * Each Address configuration change is represented by a TLV 648 * parameter as defined in Section 3.2. One or more requests may 649 * be present in an ASCONF Chunk. 650 * 651 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 652 * 653 * Serial Number: 32 bits (unsigned integer) 654 * This value represents the Serial Number for the received ASCONF 655 * Chunk that is acknowledged by this chunk. This value is copied 656 * from the received ASCONF Chunk. 657 * 658 * ASCONF Parameter Response: TLV format 659 * The ASCONF Parameter Response is used in the ASCONF-ACK to 660 * report status of ASCONF processing. 661 */ 662 struct sctp_addip_param { 663 struct sctp_paramhdr param_hdr; 664 __be32 crr_id; 665 }; 666 667 struct sctp_addiphdr { 668 __be32 serial; 669 /* __u8 params[]; */ 670 }; 671 672 struct sctp_addip_chunk { 673 struct sctp_chunkhdr chunk_hdr; 674 struct sctp_addiphdr addip_hdr; 675 }; 676 677 /* AUTH 678 * Section 4.1 Authentication Chunk (AUTH) 679 * 680 * This chunk is used to hold the result of the HMAC calculation. 681 * 682 * 0 1 2 3 683 * 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 1 684 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 685 * | Type = 0x0F | Flags=0 | Length | 686 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 687 * | Shared Key Identifier | HMAC Identifier | 688 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 689 * | | 690 * \ HMAC / 691 * / \ 692 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 693 * 694 * Type: 1 byte (unsigned integer) 695 * This value MUST be set to 0x0F for all AUTH-chunks. 696 * 697 * Flags: 1 byte (unsigned integer) 698 * Set to zero on transmit and ignored on receipt. 699 * 700 * Length: 2 bytes (unsigned integer) 701 * This value holds the length of the HMAC in bytes plus 8. 702 * 703 * Shared Key Identifier: 2 bytes (unsigned integer) 704 * This value describes which endpoint pair shared key is used. 705 * 706 * HMAC Identifier: 2 bytes (unsigned integer) 707 * This value describes which message digest is being used. Table 2 708 * shows the currently defined values. 709 * 710 * The following Table 2 shows the currently defined values for HMAC 711 * identifiers. 712 * 713 * +-----------------+--------------------------+ 714 * | HMAC Identifier | Message Digest Algorithm | 715 * +-----------------+--------------------------+ 716 * | 0 | Reserved | 717 * | 1 | SHA-1 defined in [8] | 718 * | 2 | Reserved | 719 * | 3 | SHA-256 defined in [8] | 720 * +-----------------+--------------------------+ 721 * 722 * 723 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC 724 * calculation. 725 */ 726 struct sctp_authhdr { 727 __be16 shkey_id; 728 __be16 hmac_id; 729 /* __u8 hmac[]; */ 730 }; 731 732 struct sctp_auth_chunk { 733 struct sctp_chunkhdr chunk_hdr; 734 struct sctp_authhdr auth_hdr; 735 }; 736 737 struct sctp_infox { 738 struct sctp_info *sctpinfo; 739 struct sctp_association *asoc; 740 }; 741 742 struct sctp_reconf_chunk { 743 struct sctp_chunkhdr chunk_hdr; 744 /* __u8 params[]; */ 745 }; 746 747 struct sctp_strreset_outreq { 748 struct sctp_paramhdr param_hdr; 749 __be32 request_seq; 750 __be32 response_seq; 751 __be32 send_reset_at_tsn; 752 __be16 list_of_streams[]; 753 }; 754 755 struct sctp_strreset_inreq { 756 struct sctp_paramhdr param_hdr; 757 __be32 request_seq; 758 __be16 list_of_streams[]; 759 }; 760 761 struct sctp_strreset_tsnreq { 762 struct sctp_paramhdr param_hdr; 763 __be32 request_seq; 764 }; 765 766 struct sctp_strreset_addstrm { 767 struct sctp_paramhdr param_hdr; 768 __be32 request_seq; 769 __be16 number_of_streams; 770 __be16 reserved; 771 }; 772 773 enum { 774 SCTP_STRRESET_NOTHING_TO_DO = 0x00, 775 SCTP_STRRESET_PERFORMED = 0x01, 776 SCTP_STRRESET_DENIED = 0x02, 777 SCTP_STRRESET_ERR_WRONG_SSN = 0x03, 778 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04, 779 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05, 780 SCTP_STRRESET_IN_PROGRESS = 0x06, 781 }; 782 783 struct sctp_strreset_resp { 784 struct sctp_paramhdr param_hdr; 785 __be32 response_seq; 786 __be32 result; 787 }; 788 789 struct sctp_strreset_resptsn { 790 struct sctp_paramhdr param_hdr; 791 __be32 response_seq; 792 __be32 result; 793 __be32 senders_next_tsn; 794 __be32 receivers_next_tsn; 795 }; 796 797 enum { 798 SCTP_DSCP_SET_MASK = 0x1, 799 SCTP_DSCP_VAL_MASK = 0xfc, 800 SCTP_FLOWLABEL_SET_MASK = 0x100000, 801 SCTP_FLOWLABEL_VAL_MASK = 0xfffff 802 }; 803 804 /* UDP Encapsulation 805 * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4 806 * 807 * The error cause indicating an "Restart of an Association with 808 * New Encapsulation Port" 809 * 810 * 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 1 811 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 812 * | Cause Code = 14 | Cause Length = 8 | 813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 814 * | Current Encapsulation Port | New Encapsulation Port | 815 * +-------------------------------+-------------------------------+ 816 */ 817 struct sctp_new_encap_port_hdr { 818 __be16 cur_port; 819 __be16 new_port; 820 }; 821 822 /* Round an int up to the next multiple of 4. */ 823 #define SCTP_PAD4(s) (((s)+3)&~3) 824 /* Truncate to the previous multiple of 4. */ 825 #define SCTP_TRUNC4(s) ((s)&~3) 826 827 #endif /* __LINUX_SCTP_H__ */ 828