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 * The SCTP reference 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 * The SCTP reference 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 __u16 source; 61 __u16 dest; 62 __u32 vtag; 63 __u32 checksum; 64 } __attribute__((packed)) sctp_sctphdr_t; 65 66 /* Section 3.2. Chunk Field Descriptions. */ 67 typedef struct sctp_chunkhdr { 68 __u8 type; 69 __u8 flags; 70 __u16 length; 71 } __attribute__((packed)) sctp_chunkhdr_t; 72 73 74 /* Section 3.2. Chunk Type Values. 75 * [Chunk Type] identifies the type of information contained in the Chunk 76 * Value field. It takes a value from 0 to 254. The value of 255 is 77 * reserved for future use as an extension field. 78 */ 79 typedef enum { 80 SCTP_CID_DATA = 0, 81 SCTP_CID_INIT = 1, 82 SCTP_CID_INIT_ACK = 2, 83 SCTP_CID_SACK = 3, 84 SCTP_CID_HEARTBEAT = 4, 85 SCTP_CID_HEARTBEAT_ACK = 5, 86 SCTP_CID_ABORT = 6, 87 SCTP_CID_SHUTDOWN = 7, 88 SCTP_CID_SHUTDOWN_ACK = 8, 89 SCTP_CID_ERROR = 9, 90 SCTP_CID_COOKIE_ECHO = 10, 91 SCTP_CID_COOKIE_ACK = 11, 92 SCTP_CID_ECN_ECNE = 12, 93 SCTP_CID_ECN_CWR = 13, 94 SCTP_CID_SHUTDOWN_COMPLETE = 14, 95 96 /* PR-SCTP Sec 3.2 */ 97 SCTP_CID_FWD_TSN = 0xC0, 98 99 /* Use hex, as defined in ADDIP sec. 3.1 */ 100 SCTP_CID_ASCONF = 0xC1, 101 SCTP_CID_ASCONF_ACK = 0x80, 102 } sctp_cid_t; /* 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 typedef 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 } sctp_cid_action_t; 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 typedef struct sctp_paramhdr { 156 __u16 type; 157 __u16 length; 158 } __attribute__((packed)) sctp_paramhdr_t; 159 160 typedef enum { 161 162 /* RFC 2960 Section 3.3.5 */ 163 SCTP_PARAM_HEARTBEAT_INFO = __constant_htons(1), 164 /* RFC 2960 Section 3.3.2.1 */ 165 SCTP_PARAM_IPV4_ADDRESS = __constant_htons(5), 166 SCTP_PARAM_IPV6_ADDRESS = __constant_htons(6), 167 SCTP_PARAM_STATE_COOKIE = __constant_htons(7), 168 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = __constant_htons(8), 169 SCTP_PARAM_COOKIE_PRESERVATIVE = __constant_htons(9), 170 SCTP_PARAM_HOST_NAME_ADDRESS = __constant_htons(11), 171 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = __constant_htons(12), 172 SCTP_PARAM_ECN_CAPABLE = __constant_htons(0x8000), 173 174 /* PR-SCTP Sec 3.1 */ 175 SCTP_PARAM_FWD_TSN_SUPPORT = __constant_htons(0xc000), 176 177 /* Add-IP Extension. Section 3.2 */ 178 SCTP_PARAM_ADD_IP = __constant_htons(0xc001), 179 SCTP_PARAM_DEL_IP = __constant_htons(0xc002), 180 SCTP_PARAM_ERR_CAUSE = __constant_htons(0xc003), 181 SCTP_PARAM_SET_PRIMARY = __constant_htons(0xc004), 182 SCTP_PARAM_SUCCESS_REPORT = __constant_htons(0xc005), 183 SCTP_PARAM_ADAPTION_LAYER_IND = __constant_htons(0xc006), 184 185 } sctp_param_t; /* enum */ 186 187 188 /* RFC 2960 Section 3.2.1 189 * The Parameter Types are encoded such that the highest-order two bits 190 * specify the action that must be taken if the processing endpoint does 191 * not recognize the Parameter Type. 192 * 193 */ 194 typedef enum { 195 SCTP_PARAM_ACTION_DISCARD = __constant_htons(0x0000), 196 SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000), 197 SCTP_PARAM_ACTION_SKIP = __constant_htons(0x8000), 198 SCTP_PARAM_ACTION_SKIP_ERR = __constant_htons(0xc000), 199 } sctp_param_action_t; 200 201 enum { SCTP_PARAM_ACTION_MASK = __constant_htons(0xc000), }; 202 203 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ 204 205 typedef struct sctp_datahdr { 206 __u32 tsn; 207 __u16 stream; 208 __u16 ssn; 209 __u32 ppid; 210 __u8 payload[0]; 211 } __attribute__((packed)) sctp_datahdr_t; 212 213 typedef struct sctp_data_chunk { 214 sctp_chunkhdr_t chunk_hdr; 215 sctp_datahdr_t data_hdr; 216 } __attribute__((packed)) sctp_data_chunk_t; 217 218 /* DATA Chuck Specific Flags */ 219 enum { 220 SCTP_DATA_MIDDLE_FRAG = 0x00, 221 SCTP_DATA_LAST_FRAG = 0x01, 222 SCTP_DATA_FIRST_FRAG = 0x02, 223 SCTP_DATA_NOT_FRAG = 0x03, 224 SCTP_DATA_UNORDERED = 0x04, 225 }; 226 enum { SCTP_DATA_FRAG_MASK = 0x03, }; 227 228 229 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1) 230 * 231 * This chunk is used to initiate a SCTP association between two 232 * endpoints. 233 */ 234 typedef struct sctp_inithdr { 235 __u32 init_tag; 236 __u32 a_rwnd; 237 __u16 num_outbound_streams; 238 __u16 num_inbound_streams; 239 __u32 initial_tsn; 240 __u8 params[0]; 241 } __attribute__((packed)) sctp_inithdr_t; 242 243 typedef struct sctp_init_chunk { 244 sctp_chunkhdr_t chunk_hdr; 245 sctp_inithdr_t init_hdr; 246 } __attribute__((packed)) sctp_init_chunk_t; 247 248 249 /* Section 3.3.2.1. IPv4 Address Parameter (5) */ 250 typedef struct sctp_ipv4addr_param { 251 sctp_paramhdr_t param_hdr; 252 struct in_addr addr; 253 } __attribute__((packed)) sctp_ipv4addr_param_t; 254 255 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ 256 typedef struct sctp_ipv6addr_param { 257 sctp_paramhdr_t param_hdr; 258 struct in6_addr addr; 259 } __attribute__((packed)) sctp_ipv6addr_param_t; 260 261 /* Section 3.3.2.1 Cookie Preservative (9) */ 262 typedef struct sctp_cookie_preserve_param { 263 sctp_paramhdr_t param_hdr; 264 uint32_t lifespan_increment; 265 } __attribute__((packed)) sctp_cookie_preserve_param_t; 266 267 /* Section 3.3.2.1 Host Name Address (11) */ 268 typedef struct sctp_hostname_param { 269 sctp_paramhdr_t param_hdr; 270 uint8_t hostname[0]; 271 } __attribute__((packed)) sctp_hostname_param_t; 272 273 /* Section 3.3.2.1 Supported Address Types (12) */ 274 typedef struct sctp_supported_addrs_param { 275 sctp_paramhdr_t param_hdr; 276 uint16_t types[0]; 277 } __attribute__((packed)) sctp_supported_addrs_param_t; 278 279 /* Appendix A. ECN Capable (32768) */ 280 typedef struct sctp_ecn_capable_param { 281 sctp_paramhdr_t param_hdr; 282 } __attribute__((packed)) sctp_ecn_capable_param_t; 283 284 /* ADDIP Section 3.2.6 Adaption Layer Indication */ 285 typedef struct sctp_adaption_ind_param { 286 struct sctp_paramhdr param_hdr; 287 __u32 adaption_ind; 288 } __attribute__((packed)) sctp_adaption_ind_param_t; 289 290 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): 291 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP 292 * association. 293 */ 294 typedef sctp_init_chunk_t sctp_initack_chunk_t; 295 296 /* Section 3.3.3.1 State Cookie (7) */ 297 typedef struct sctp_cookie_param { 298 sctp_paramhdr_t p; 299 __u8 body[0]; 300 } __attribute__((packed)) sctp_cookie_param_t; 301 302 /* Section 3.3.3.1 Unrecognized Parameters (8) */ 303 typedef struct sctp_unrecognized_param { 304 sctp_paramhdr_t param_hdr; 305 sctp_paramhdr_t unrecognized; 306 } __attribute__((packed)) sctp_unrecognized_param_t; 307 308 309 310 /* 311 * 3.3.4 Selective Acknowledgement (SACK) (3): 312 * 313 * This chunk is sent to the peer endpoint to acknowledge received DATA 314 * chunks and to inform the peer endpoint of gaps in the received 315 * subsequences of DATA chunks as represented by their TSNs. 316 */ 317 318 typedef struct sctp_gap_ack_block { 319 __u16 start; 320 __u16 end; 321 } __attribute__((packed)) sctp_gap_ack_block_t; 322 323 typedef uint32_t sctp_dup_tsn_t; 324 325 typedef union { 326 sctp_gap_ack_block_t gab; 327 sctp_dup_tsn_t dup; 328 } sctp_sack_variable_t; 329 330 typedef struct sctp_sackhdr { 331 __u32 cum_tsn_ack; 332 __u32 a_rwnd; 333 __u16 num_gap_ack_blocks; 334 __u16 num_dup_tsns; 335 sctp_sack_variable_t variable[0]; 336 } __attribute__((packed)) sctp_sackhdr_t; 337 338 typedef struct sctp_sack_chunk { 339 sctp_chunkhdr_t chunk_hdr; 340 sctp_sackhdr_t sack_hdr; 341 } __attribute__((packed)) sctp_sack_chunk_t; 342 343 344 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): 345 * 346 * An endpoint should send this chunk to its peer endpoint to probe the 347 * reachability of a particular destination transport address defined in 348 * the present association. 349 */ 350 351 typedef struct sctp_heartbeathdr { 352 sctp_paramhdr_t info; 353 } __attribute__((packed)) sctp_heartbeathdr_t; 354 355 typedef struct sctp_heartbeat_chunk { 356 sctp_chunkhdr_t chunk_hdr; 357 sctp_heartbeathdr_t hb_hdr; 358 } __attribute__((packed)) sctp_heartbeat_chunk_t; 359 360 361 /* For the abort and shutdown ACK we must carry the init tag in the 362 * common header. Just the common header is all that is needed with a 363 * chunk descriptor. 364 */ 365 typedef struct sctp_abort_chunk { 366 sctp_chunkhdr_t uh; 367 } __attribute__((packed)) sctp_abort_chunk_t; 368 369 370 /* For the graceful shutdown we must carry the tag (in common header) 371 * and the highest consecutive acking value. 372 */ 373 typedef struct sctp_shutdownhdr { 374 __u32 cum_tsn_ack; 375 } __attribute__((packed)) sctp_shutdownhdr_t; 376 377 struct sctp_shutdown_chunk_t { 378 sctp_chunkhdr_t chunk_hdr; 379 sctp_shutdownhdr_t shutdown_hdr; 380 } __attribute__ ((packed)); 381 382 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ 383 384 typedef struct sctp_errhdr { 385 __u16 cause; 386 __u16 length; 387 __u8 variable[0]; 388 } __attribute__((packed)) sctp_errhdr_t; 389 390 typedef struct sctp_operr_chunk { 391 sctp_chunkhdr_t chunk_hdr; 392 sctp_errhdr_t err_hdr; 393 } __attribute__((packed)) sctp_operr_chunk_t; 394 395 /* RFC 2960 3.3.10 - Operation Error 396 * 397 * Cause Code: 16 bits (unsigned integer) 398 * 399 * Defines the type of error conditions being reported. 400 * Cause Code 401 * Value Cause Code 402 * --------- ---------------- 403 * 1 Invalid Stream Identifier 404 * 2 Missing Mandatory Parameter 405 * 3 Stale Cookie Error 406 * 4 Out of Resource 407 * 5 Unresolvable Address 408 * 6 Unrecognized Chunk Type 409 * 7 Invalid Mandatory Parameter 410 * 8 Unrecognized Parameters 411 * 9 No User Data 412 * 10 Cookie Received While Shutting Down 413 */ 414 typedef enum { 415 416 SCTP_ERROR_NO_ERROR = __constant_htons(0x00), 417 SCTP_ERROR_INV_STRM = __constant_htons(0x01), 418 SCTP_ERROR_MISS_PARAM = __constant_htons(0x02), 419 SCTP_ERROR_STALE_COOKIE = __constant_htons(0x03), 420 SCTP_ERROR_NO_RESOURCE = __constant_htons(0x04), 421 SCTP_ERROR_DNS_FAILED = __constant_htons(0x05), 422 SCTP_ERROR_UNKNOWN_CHUNK = __constant_htons(0x06), 423 SCTP_ERROR_INV_PARAM = __constant_htons(0x07), 424 SCTP_ERROR_UNKNOWN_PARAM = __constant_htons(0x08), 425 SCTP_ERROR_NO_DATA = __constant_htons(0x09), 426 SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a), 427 428 429 /* SCTP Implementation Guide: 430 * 11 Restart of an association with new addresses 431 * 12 User Initiated Abort 432 * 13 Protocol Violation 433 */ 434 435 SCTP_ERROR_RESTART = __constant_htons(0x0b), 436 SCTP_ERROR_USER_ABORT = __constant_htons(0x0c), 437 SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d), 438 439 /* ADDIP Section 3.3 New Error Causes 440 * 441 * Four new Error Causes are added to the SCTP Operational Errors, 442 * primarily for use in the ASCONF-ACK chunk. 443 * 444 * Value Cause Code 445 * --------- ---------------- 446 * 0x0100 Request to Delete Last Remaining IP Address. 447 * 0x0101 Operation Refused Due to Resource Shortage. 448 * 0x0102 Request to Delete Source IP Address. 449 * 0x0103 Association Aborted due to illegal ASCONF-ACK 450 * 0x0104 Request refused - no authorization. 451 */ 452 SCTP_ERROR_DEL_LAST_IP = __constant_htons(0x0100), 453 SCTP_ERROR_RSRC_LOW = __constant_htons(0x0101), 454 SCTP_ERROR_DEL_SRC_IP = __constant_htons(0x0102), 455 SCTP_ERROR_ASCONF_ACK = __constant_htons(0x0103), 456 SCTP_ERROR_REQ_REFUSED = __constant_htons(0x0104) 457 } sctp_error_t; 458 459 460 461 /* RFC 2960. Appendix A. Explicit Congestion Notification. 462 * Explicit Congestion Notification Echo (ECNE) (12) 463 */ 464 typedef struct sctp_ecnehdr { 465 __u32 lowest_tsn; 466 } sctp_ecnehdr_t; 467 468 typedef struct sctp_ecne_chunk { 469 sctp_chunkhdr_t chunk_hdr; 470 sctp_ecnehdr_t ence_hdr; 471 } __attribute__((packed)) sctp_ecne_chunk_t; 472 473 /* RFC 2960. Appendix A. Explicit Congestion Notification. 474 * Congestion Window Reduced (CWR) (13) 475 */ 476 typedef struct sctp_cwrhdr { 477 __u32 lowest_tsn; 478 } sctp_cwrhdr_t; 479 480 typedef struct sctp_cwr_chunk { 481 sctp_chunkhdr_t chunk_hdr; 482 sctp_cwrhdr_t cwr_hdr; 483 } __attribute__((packed)) sctp_cwr_chunk_t; 484 485 /* PR-SCTP 486 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) 487 * 488 * Forward Cumulative TSN chunk has the following format: 489 * 490 * 0 1 2 3 491 * 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 1 492 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 493 * | Type = 192 | Flags = 0x00 | Length = Variable | 494 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 495 * | New Cumulative TSN | 496 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 497 * | Stream-1 | Stream Sequence-1 | 498 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 499 * \ / 500 * / \ 501 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 502 * | Stream-N | Stream Sequence-N | 503 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 504 * 505 * Chunk Flags: 506 * 507 * Set to all zeros on transmit and ignored on receipt. 508 * 509 * New Cumulative TSN: 32 bit u_int 510 * 511 * This indicates the new cumulative TSN to the data receiver. Upon 512 * the reception of this value, the data receiver MUST consider 513 * any missing TSNs earlier than or equal to this value as received 514 * and stop reporting them as gaps in any subsequent SACKs. 515 * 516 * Stream-N: 16 bit u_int 517 * 518 * This field holds a stream number that was skipped by this 519 * FWD-TSN. 520 * 521 * Stream Sequence-N: 16 bit u_int 522 * This field holds the sequence number associated with the stream 523 * that was skipped. The stream sequence field holds the largest stream 524 * sequence number in this stream being skipped. The receiver of 525 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields 526 * to enable delivery of any stranded TSN's that remain on the stream 527 * re-ordering queues. This field MUST NOT report TSN's corresponding 528 * to DATA chunk that are marked as unordered. For ordered DATA 529 * chunks this field MUST be filled in. 530 */ 531 struct sctp_fwdtsn_skip { 532 __u16 stream; 533 __u16 ssn; 534 } __attribute__((packed)); 535 536 struct sctp_fwdtsn_hdr { 537 __u32 new_cum_tsn; 538 struct sctp_fwdtsn_skip skip[0]; 539 } __attribute((packed)); 540 541 struct sctp_fwdtsn_chunk { 542 struct sctp_chunkhdr chunk_hdr; 543 struct sctp_fwdtsn_hdr fwdtsn_hdr; 544 } __attribute((packed)); 545 546 547 /* ADDIP 548 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) 549 * 550 * Serial Number: 32 bits (unsigned integer) 551 * This value represents a Serial Number for the ASCONF Chunk. The 552 * valid range of Serial Number is from 0 to 2^32-1. 553 * Serial Numbers wrap back to 0 after reaching 2^32 -1. 554 * 555 * Address Parameter: 8 or 20 bytes (depending on type) 556 * The address is an address of the sender of the ASCONF chunk, 557 * the address MUST be considered part of the association by the 558 * peer endpoint. This field may be used by the receiver of the 559 * ASCONF to help in finding the association. This parameter MUST 560 * be present in every ASCONF message i.e. it is a mandatory TLV 561 * parameter. 562 * 563 * ASCONF Parameter: TLV format 564 * Each Address configuration change is represented by a TLV 565 * parameter as defined in Section 3.2. One or more requests may 566 * be present in an ASCONF Chunk. 567 * 568 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 569 * 570 * Serial Number: 32 bits (unsigned integer) 571 * This value represents the Serial Number for the received ASCONF 572 * Chunk that is acknowledged by this chunk. This value is copied 573 * from the received ASCONF Chunk. 574 * 575 * ASCONF Parameter Response: TLV format 576 * The ASCONF Parameter Response is used in the ASCONF-ACK to 577 * report status of ASCONF processing. 578 */ 579 typedef struct sctp_addip_param { 580 sctp_paramhdr_t param_hdr; 581 __u32 crr_id; 582 } __attribute__((packed)) sctp_addip_param_t; 583 584 typedef struct sctp_addiphdr { 585 __u32 serial; 586 __u8 params[0]; 587 } __attribute__((packed)) sctp_addiphdr_t; 588 589 typedef struct sctp_addip_chunk { 590 sctp_chunkhdr_t chunk_hdr; 591 sctp_addiphdr_t addip_hdr; 592 } __attribute__((packed)) sctp_addip_chunk_t; 593 594 #endif /* __LINUX_SCTP_H__ */ 595