1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifdef __FreeBSD__ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: head/sys/netinet/sctp_header.h 309682 2016-12-07 19:30:59Z tuexen $"); 38 #endif 39 40 #ifndef _NETINET_SCTP_HEADER_H_ 41 #define _NETINET_SCTP_HEADER_H_ 42 43 #if defined(__Windows__) && !defined(__Userspace_os_Windows) 44 #include <packon.h> 45 #endif 46 #if !defined(__Userspace_os_Windows) 47 #include <sys/time.h> 48 #endif 49 #include <netinet/sctp.h> 50 #include <netinet/sctp_constants.h> 51 52 #if !defined(__Userspace_os_Windows) 53 #define SCTP_PACKED __attribute__((packed)) 54 #else 55 #pragma pack (push, 1) 56 #define SCTP_PACKED 57 #endif 58 59 /* 60 * Parameter structures 61 */ 62 struct sctp_ipv4addr_param { 63 struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */ 64 uint32_t addr; /* IPV4 address */ 65 } SCTP_PACKED; 66 67 #define SCTP_V6_ADDR_BYTES 16 68 69 70 struct sctp_ipv6addr_param { 71 struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */ 72 uint8_t addr[SCTP_V6_ADDR_BYTES]; /* IPV6 address */ 73 } SCTP_PACKED; 74 75 /* Cookie Preservative */ 76 struct sctp_cookie_perserve_param { 77 struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */ 78 uint32_t time; /* time in ms to extend cookie */ 79 } SCTP_PACKED; 80 81 #define SCTP_ARRAY_MIN_LEN 1 82 /* Host Name Address */ 83 struct sctp_host_name_param { 84 struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */ 85 char name[SCTP_ARRAY_MIN_LEN]; /* host name */ 86 } SCTP_PACKED; 87 88 /* 89 * This is the maximum padded size of a s-a-p 90 * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12 91 */ 92 #define SCTP_MAX_ADDR_PARAMS_SIZE 12 93 /* supported address type */ 94 struct sctp_supported_addr_param { 95 struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */ 96 uint16_t addr_type[2]; /* array of supported address types */ 97 } SCTP_PACKED; 98 99 /* heartbeat info parameter */ 100 struct sctp_heartbeat_info_param { 101 struct sctp_paramhdr ph; 102 uint32_t time_value_1; 103 uint32_t time_value_2; 104 uint32_t random_value1; 105 uint32_t random_value2; 106 uint8_t addr_family; 107 uint8_t addr_len; 108 /* make sure that this structure is 4 byte aligned */ 109 uint8_t padding[2]; 110 char address[SCTP_ADDRMAX]; 111 } SCTP_PACKED; 112 113 114 /* draft-ietf-tsvwg-prsctp */ 115 /* PR-SCTP supported parameter */ 116 struct sctp_prsctp_supported_param { 117 struct sctp_paramhdr ph; 118 } SCTP_PACKED; 119 120 121 /* draft-ietf-tsvwg-addip-sctp */ 122 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */ 123 struct sctp_paramhdr ph;/* a SCTP parameter header */ 124 uint32_t correlation_id;/* correlation id for this param */ 125 } SCTP_PACKED; 126 127 struct sctp_asconf_addr_param { /* an ASCONF address parameter */ 128 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 129 struct sctp_ipv6addr_param addrp; /* max storage size */ 130 } SCTP_PACKED; 131 132 133 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */ 134 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 135 uint32_t local_vtag; 136 uint32_t remote_vtag; 137 } SCTP_PACKED; 138 139 140 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */ 141 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 142 struct sctp_ipv4addr_param addrp; /* max storage size */ 143 } SCTP_PACKED; 144 145 #define SCTP_MAX_SUPPORTED_EXT 256 146 147 struct sctp_supported_chunk_types_param { 148 struct sctp_paramhdr ph;/* type = 0x8008 len = x */ 149 uint8_t chunk_types[]; 150 } SCTP_PACKED; 151 152 153 /* 154 * Structures for DATA chunks 155 */ 156 struct sctp_data { 157 uint32_t tsn; 158 uint16_t sid; 159 uint16_t ssn; 160 uint32_t ppid; 161 /* user data follows */ 162 } SCTP_PACKED; 163 164 struct sctp_data_chunk { 165 struct sctp_chunkhdr ch; 166 struct sctp_data dp; 167 } SCTP_PACKED; 168 169 struct sctp_idata { 170 uint32_t tsn; 171 uint16_t sid; 172 uint16_t reserved; /* Where does the SSN go? */ 173 uint32_t mid; 174 union { 175 uint32_t ppid; 176 uint32_t fsn; /* Fragment Sequence Number */ 177 } ppid_fsn; 178 /* user data follows */ 179 } SCTP_PACKED; 180 181 struct sctp_idata_chunk { 182 struct sctp_chunkhdr ch; 183 struct sctp_idata dp; 184 } SCTP_PACKED; 185 186 /* 187 * Structures for the control chunks 188 */ 189 190 /* Initiate (INIT)/Initiate Ack (INIT ACK) */ 191 struct sctp_init { 192 uint32_t initiate_tag; /* initiate tag */ 193 uint32_t a_rwnd; /* a_rwnd */ 194 uint16_t num_outbound_streams; /* OS */ 195 uint16_t num_inbound_streams; /* MIS */ 196 uint32_t initial_tsn; /* I-TSN */ 197 /* optional param's follow */ 198 } SCTP_PACKED; 199 #define SCTP_IDENTIFICATION_SIZE 16 200 #define SCTP_ADDRESS_SIZE 4 201 #if defined(__Userspace__) 202 #define SCTP_RESERVE_SPACE 5 203 #else 204 #define SCTP_RESERVE_SPACE 6 205 #endif 206 /* state cookie header */ 207 struct sctp_state_cookie { /* this is our definition... */ 208 uint8_t identification[SCTP_IDENTIFICATION_SIZE];/* id of who we are */ 209 struct timeval time_entered; /* the time I built cookie */ 210 uint32_t cookie_life; /* life I will award this cookie */ 211 uint32_t tie_tag_my_vtag; /* my tag in old association */ 212 213 uint32_t tie_tag_peer_vtag; /* peers tag in old association */ 214 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */ 215 216 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */ 217 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */ 218 uint32_t addr_type; /* address type */ 219 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */ 220 uint32_t laddr_type; /* my local from address type */ 221 uint32_t scope_id; /* v6 scope id for link-locals */ 222 223 uint16_t peerport; /* port address of the peer in the INIT */ 224 uint16_t myport; /* my port address used in the INIT */ 225 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */ 226 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */ 227 #if defined(__Userspace__) 228 uint8_t conn_addr_legal; 229 #endif 230 uint8_t local_scope; /* IPv6 local scope flag */ 231 uint8_t site_scope; /* IPv6 site scope flag */ 232 233 uint8_t ipv4_scope; /* IPv4 private addr scope */ 234 uint8_t loopback_scope; /* loopback scope information */ 235 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */ 236 /* 237 * at the end is tacked on the INIT chunk and the INIT-ACK chunk 238 * (minus the cookie). 239 */ 240 } SCTP_PACKED; 241 242 /* state cookie parameter */ 243 struct sctp_state_cookie_param { 244 struct sctp_paramhdr ph; 245 struct sctp_state_cookie cookie; 246 } SCTP_PACKED; 247 248 struct sctp_init_chunk { 249 struct sctp_chunkhdr ch; 250 struct sctp_init init; 251 } SCTP_PACKED; 252 253 struct sctp_init_msg { 254 struct sctphdr sh; 255 struct sctp_init_chunk msg; 256 } SCTP_PACKED; 257 258 /* ... used for both INIT and INIT ACK */ 259 #define sctp_init_ack sctp_init 260 #define sctp_init_ack_chunk sctp_init_chunk 261 #define sctp_init_ack_msg sctp_init_msg 262 263 264 /* Selective Ack (SACK) */ 265 struct sctp_gap_ack_block { 266 uint16_t start; /* Gap Ack block start */ 267 uint16_t end; /* Gap Ack block end */ 268 } SCTP_PACKED; 269 270 struct sctp_sack { 271 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 272 uint32_t a_rwnd; /* updated a_rwnd of sender */ 273 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 274 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 275 /* struct sctp_gap_ack_block's follow */ 276 /* uint32_t duplicate_tsn's follow */ 277 } SCTP_PACKED; 278 279 struct sctp_sack_chunk { 280 struct sctp_chunkhdr ch; 281 struct sctp_sack sack; 282 } SCTP_PACKED; 283 284 struct sctp_nr_sack { 285 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 286 uint32_t a_rwnd; /* updated a_rwnd of sender */ 287 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 288 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */ 289 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 290 uint16_t reserved; /* not currently used*/ 291 /* struct sctp_gap_ack_block's follow */ 292 /* uint32_t duplicate_tsn's follow */ 293 } SCTP_PACKED; 294 295 struct sctp_nr_sack_chunk { 296 struct sctp_chunkhdr ch; 297 struct sctp_nr_sack nr_sack; 298 } SCTP_PACKED; 299 300 301 /* Heartbeat Request (HEARTBEAT) */ 302 struct sctp_heartbeat { 303 struct sctp_heartbeat_info_param hb_info; 304 } SCTP_PACKED; 305 306 struct sctp_heartbeat_chunk { 307 struct sctp_chunkhdr ch; 308 struct sctp_heartbeat heartbeat; 309 } SCTP_PACKED; 310 311 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */ 312 #define sctp_heartbeat_ack sctp_heartbeat 313 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk 314 315 316 /* Abort Asssociation (ABORT) */ 317 struct sctp_abort_chunk { 318 struct sctp_chunkhdr ch; 319 /* optional error cause may follow */ 320 } SCTP_PACKED; 321 322 struct sctp_abort_msg { 323 struct sctphdr sh; 324 struct sctp_abort_chunk msg; 325 } SCTP_PACKED; 326 327 328 /* Shutdown Association (SHUTDOWN) */ 329 struct sctp_shutdown_chunk { 330 struct sctp_chunkhdr ch; 331 uint32_t cumulative_tsn_ack; 332 } SCTP_PACKED; 333 334 335 /* Shutdown Acknowledgment (SHUTDOWN ACK) */ 336 struct sctp_shutdown_ack_chunk { 337 struct sctp_chunkhdr ch; 338 } SCTP_PACKED; 339 340 341 /* Operation Error (ERROR) */ 342 struct sctp_error_chunk { 343 struct sctp_chunkhdr ch; 344 /* optional error causes follow */ 345 } SCTP_PACKED; 346 347 348 /* Cookie Echo (COOKIE ECHO) */ 349 struct sctp_cookie_echo_chunk { 350 struct sctp_chunkhdr ch; 351 struct sctp_state_cookie cookie; 352 } SCTP_PACKED; 353 354 /* Cookie Acknowledgment (COOKIE ACK) */ 355 struct sctp_cookie_ack_chunk { 356 struct sctp_chunkhdr ch; 357 } SCTP_PACKED; 358 359 /* Explicit Congestion Notification Echo (ECNE) */ 360 struct old_sctp_ecne_chunk { 361 struct sctp_chunkhdr ch; 362 uint32_t tsn; 363 } SCTP_PACKED; 364 365 struct sctp_ecne_chunk { 366 struct sctp_chunkhdr ch; 367 uint32_t tsn; 368 uint32_t num_pkts_since_cwr; 369 } SCTP_PACKED; 370 371 /* Congestion Window Reduced (CWR) */ 372 struct sctp_cwr_chunk { 373 struct sctp_chunkhdr ch; 374 uint32_t tsn; 375 } SCTP_PACKED; 376 377 /* Shutdown Complete (SHUTDOWN COMPLETE) */ 378 struct sctp_shutdown_complete_chunk { 379 struct sctp_chunkhdr ch; 380 } SCTP_PACKED; 381 382 struct sctp_adaptation_layer_indication { 383 struct sctp_paramhdr ph; 384 uint32_t indication; 385 } SCTP_PACKED; 386 387 /* 388 * draft-ietf-tsvwg-addip-sctp 389 */ 390 /* Address/Stream Configuration Change (ASCONF) */ 391 struct sctp_asconf_chunk { 392 struct sctp_chunkhdr ch; 393 uint32_t serial_number; 394 /* lookup address parameter (mandatory) */ 395 /* asconf parameters follow */ 396 } SCTP_PACKED; 397 398 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */ 399 struct sctp_asconf_ack_chunk { 400 struct sctp_chunkhdr ch; 401 uint32_t serial_number; 402 /* asconf parameters follow */ 403 } SCTP_PACKED; 404 405 /* draft-ietf-tsvwg-prsctp */ 406 /* Forward Cumulative TSN (FORWARD TSN) */ 407 struct sctp_forward_tsn_chunk { 408 struct sctp_chunkhdr ch; 409 uint32_t new_cumulative_tsn; 410 /* stream/sequence pairs (sctp_strseq) follow */ 411 } SCTP_PACKED; 412 413 struct sctp_strseq { 414 uint16_t sid; 415 uint16_t ssn; 416 } SCTP_PACKED; 417 418 struct sctp_strseq_mid { 419 uint16_t sid; 420 uint16_t flags; 421 uint32_t mid; 422 }; 423 424 struct sctp_forward_tsn_msg { 425 struct sctphdr sh; 426 struct sctp_forward_tsn_chunk msg; 427 } SCTP_PACKED; 428 429 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */ 430 431 #define SCTP_NUM_DB_TO_VERIFY 31 432 433 struct sctp_chunk_desc { 434 uint8_t chunk_type; 435 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY]; 436 uint32_t tsn_ifany; 437 } SCTP_PACKED; 438 439 440 struct sctp_pktdrop_chunk { 441 struct sctp_chunkhdr ch; 442 uint32_t bottle_bw; 443 uint32_t current_onq; 444 uint16_t trunc_len; 445 uint16_t reserved; 446 uint8_t data[]; 447 } SCTP_PACKED; 448 449 /**********STREAM RESET STUFF ******************/ 450 451 struct sctp_stream_reset_request { 452 struct sctp_paramhdr ph; 453 uint32_t request_seq; 454 } SCTP_PACKED; 455 456 struct sctp_stream_reset_out_request { 457 struct sctp_paramhdr ph; 458 uint32_t request_seq; /* monotonically increasing seq no */ 459 uint32_t response_seq; /* if a response, the resp seq no */ 460 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */ 461 uint16_t list_of_streams[]; /* if not all list of streams */ 462 } SCTP_PACKED; 463 464 struct sctp_stream_reset_in_request { 465 struct sctp_paramhdr ph; 466 uint32_t request_seq; 467 uint16_t list_of_streams[]; /* if not all list of streams */ 468 } SCTP_PACKED; 469 470 struct sctp_stream_reset_tsn_request { 471 struct sctp_paramhdr ph; 472 uint32_t request_seq; 473 } SCTP_PACKED; 474 475 struct sctp_stream_reset_response { 476 struct sctp_paramhdr ph; 477 uint32_t response_seq; /* if a response, the resp seq no */ 478 uint32_t result; 479 } SCTP_PACKED; 480 481 struct sctp_stream_reset_response_tsn { 482 struct sctp_paramhdr ph; 483 uint32_t response_seq; /* if a response, the resp seq no */ 484 uint32_t result; 485 uint32_t senders_next_tsn; 486 uint32_t receivers_next_tsn; 487 } SCTP_PACKED; 488 489 struct sctp_stream_reset_add_strm { 490 struct sctp_paramhdr ph; 491 uint32_t request_seq; 492 uint16_t number_of_streams; 493 uint16_t reserved; 494 } SCTP_PACKED; 495 496 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO 0x00000000 /* XXX: unused */ 497 #define SCTP_STREAM_RESET_RESULT_PERFORMED 0x00000001 498 #define SCTP_STREAM_RESET_RESULT_DENIED 0x00000002 499 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN 0x00000003 /* XXX: unused */ 500 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004 501 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO 0x00000005 502 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS 0x00000006 /* XXX: unused */ 503 504 /* 505 * convience structures, note that if you are making a request for specific 506 * streams then the request will need to be an overlay structure. 507 */ 508 509 struct sctp_stream_reset_tsn_req { 510 struct sctp_chunkhdr ch; 511 struct sctp_stream_reset_tsn_request sr_req; 512 } SCTP_PACKED; 513 514 struct sctp_stream_reset_resp { 515 struct sctp_chunkhdr ch; 516 struct sctp_stream_reset_response sr_resp; 517 } SCTP_PACKED; 518 519 /* respone only valid with a TSN request */ 520 struct sctp_stream_reset_resp_tsn { 521 struct sctp_chunkhdr ch; 522 struct sctp_stream_reset_response_tsn sr_resp; 523 } SCTP_PACKED; 524 525 /****************************************************/ 526 527 /* 528 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth 529 */ 530 531 /* Should we make the max be 32? */ 532 #define SCTP_RANDOM_MAX_SIZE 256 533 struct sctp_auth_random { 534 struct sctp_paramhdr ph;/* type = 0x8002 */ 535 uint8_t random_data[]; 536 } SCTP_PACKED; 537 538 struct sctp_auth_chunk_list { 539 struct sctp_paramhdr ph;/* type = 0x8003 */ 540 uint8_t chunk_types[]; 541 } SCTP_PACKED; 542 543 struct sctp_auth_hmac_algo { 544 struct sctp_paramhdr ph;/* type = 0x8004 */ 545 uint16_t hmac_ids[]; 546 } SCTP_PACKED; 547 548 struct sctp_auth_chunk { 549 struct sctp_chunkhdr ch; 550 uint16_t shared_key_id; 551 uint16_t hmac_id; 552 uint8_t hmac[]; 553 } SCTP_PACKED; 554 555 /* 556 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing 557 * pieces. If ENCE is missing we could have a couple of blocks. This way we 558 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size 559 * data chunk I will split into. We could increase throughput slightly by 560 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I 561 * feel is worth it for now. 562 */ 563 #ifndef SCTP_MAX_OVERHEAD 564 #ifdef INET6 565 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 566 sizeof(struct sctphdr) + \ 567 sizeof(struct sctp_ecne_chunk) + \ 568 sizeof(struct sctp_sack_chunk) + \ 569 sizeof(struct ip6_hdr)) 570 571 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 572 sizeof(struct sctphdr) + \ 573 sizeof(struct ip6_hdr)) 574 575 576 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \ 577 sizeof(struct sctphdr)) 578 579 #else 580 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 581 sizeof(struct sctphdr) + \ 582 sizeof(struct sctp_ecne_chunk) + \ 583 sizeof(struct sctp_sack_chunk) + \ 584 sizeof(struct ip)) 585 586 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 587 sizeof(struct sctphdr) + \ 588 sizeof(struct ip)) 589 590 591 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \ 592 sizeof(struct sctphdr)) 593 594 #endif /* INET6 */ 595 #endif /* !SCTP_MAX_OVERHEAD */ 596 597 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 598 sizeof(struct sctphdr) + \ 599 sizeof(struct ip)) 600 601 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \ 602 sizeof(struct sctphdr)) 603 604 #if defined(__Windows__) 605 #include <packoff.h> 606 #endif 607 #if defined(__Userspace_os_Windows) 608 #pragma pack(pop) 609 #endif 610 #undef SCTP_PACKED 611 #endif /* !__sctp_header_h__ */ 612