1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef __FreeBSD__ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_header.h 240198 2012-09-07 13:36:42Z tuexen $"); 36 #endif 37 38 #ifndef _NETINET_SCTP_HEADER_H_ 39 #define _NETINET_SCTP_HEADER_H_ 40 41 #if defined(__Windows__) && !defined(__Userspace_os_Windows) 42 #include <packon.h> 43 #endif 44 #if !defined(__Userspace_os_Windows) 45 #include <sys/time.h> 46 #endif 47 #include <netinet/sctp.h> 48 #include <netinet/sctp_constants.h> 49 50 #if !defined(__Userspace_os_Windows) 51 #define SCTP_PACKED __attribute__((packed)) 52 #else 53 #pragma pack (push, 1) 54 #define SCTP_PACKED 55 #endif 56 57 /* 58 * Parameter structures 59 */ 60 struct sctp_ipv4addr_param { 61 struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */ 62 uint32_t addr; /* IPV4 address */ 63 } SCTP_PACKED; 64 65 #define SCTP_V6_ADDR_BYTES 16 66 67 68 struct sctp_ipv6addr_param { 69 struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */ 70 uint8_t addr[SCTP_V6_ADDR_BYTES]; /* IPV6 address */ 71 } SCTP_PACKED; 72 73 /* Cookie Preservative */ 74 struct sctp_cookie_perserve_param { 75 struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */ 76 uint32_t time; /* time in ms to extend cookie */ 77 } SCTP_PACKED; 78 79 #define SCTP_ARRAY_MIN_LEN 1 80 /* Host Name Address */ 81 struct sctp_host_name_param { 82 struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */ 83 char name[SCTP_ARRAY_MIN_LEN]; /* host name */ 84 } SCTP_PACKED; 85 86 /* 87 * This is the maximum padded size of a s-a-p 88 * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12 89 */ 90 #define SCTP_MAX_ADDR_PARAMS_SIZE 12 91 /* supported address type */ 92 struct sctp_supported_addr_param { 93 struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */ 94 uint16_t addr_type[2]; /* array of supported address types */ 95 } SCTP_PACKED; 96 97 /* ECN parameter */ 98 struct sctp_ecn_supported_param { 99 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */ 100 } SCTP_PACKED; 101 102 103 /* heartbeat info parameter */ 104 struct sctp_heartbeat_info_param { 105 struct sctp_paramhdr ph; 106 uint32_t time_value_1; 107 uint32_t time_value_2; 108 uint32_t random_value1; 109 uint32_t random_value2; 110 uint8_t addr_family; 111 uint8_t addr_len; 112 /* make sure that this structure is 4 byte aligned */ 113 uint8_t padding[2]; 114 char address[SCTP_ADDRMAX]; 115 } SCTP_PACKED; 116 117 118 /* draft-ietf-tsvwg-prsctp */ 119 /* PR-SCTP supported parameter */ 120 struct sctp_prsctp_supported_param { 121 struct sctp_paramhdr ph; 122 } SCTP_PACKED; 123 124 125 /* draft-ietf-tsvwg-addip-sctp */ 126 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */ 127 struct sctp_paramhdr ph;/* a SCTP parameter header */ 128 uint32_t correlation_id;/* correlation id for this param */ 129 } SCTP_PACKED; 130 131 struct sctp_asconf_addr_param { /* an ASCONF address parameter */ 132 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 133 struct sctp_ipv6addr_param addrp; /* max storage size */ 134 } SCTP_PACKED; 135 136 137 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */ 138 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 139 uint32_t local_vtag; 140 uint32_t remote_vtag; 141 } SCTP_PACKED; 142 143 144 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */ 145 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 146 struct sctp_ipv4addr_param addrp; /* max storage size */ 147 } SCTP_PACKED; 148 149 #define SCTP_MAX_SUPPORTED_EXT 256 150 151 struct sctp_supported_chunk_types_param { 152 struct sctp_paramhdr ph;/* type = 0x8008 len = x */ 153 uint8_t chunk_types[]; 154 } SCTP_PACKED; 155 156 157 /* 158 * Structures for DATA chunks 159 */ 160 struct sctp_data { 161 uint32_t tsn; 162 uint16_t stream_id; 163 uint16_t stream_sequence; 164 uint32_t protocol_id; 165 /* user data follows */ 166 } SCTP_PACKED; 167 168 struct sctp_data_chunk { 169 struct sctp_chunkhdr ch; 170 struct sctp_data dp; 171 } SCTP_PACKED; 172 173 /* 174 * Structures for the control chunks 175 */ 176 177 /* Initiate (INIT)/Initiate Ack (INIT ACK) */ 178 struct sctp_init { 179 uint32_t initiate_tag; /* initiate tag */ 180 uint32_t a_rwnd; /* a_rwnd */ 181 uint16_t num_outbound_streams; /* OS */ 182 uint16_t num_inbound_streams; /* MIS */ 183 uint32_t initial_tsn; /* I-TSN */ 184 /* optional param's follow */ 185 } SCTP_PACKED; 186 #define SCTP_IDENTIFICATION_SIZE 16 187 #define SCTP_ADDRESS_SIZE 4 188 #if defined(__Userspace__) 189 #define SCTP_RESERVE_SPACE 5 190 #else 191 #define SCTP_RESERVE_SPACE 6 192 #endif 193 /* state cookie header */ 194 struct sctp_state_cookie { /* this is our definition... */ 195 uint8_t identification[SCTP_IDENTIFICATION_SIZE];/* id of who we are */ 196 struct timeval time_entered; /* the time I built cookie */ 197 uint32_t cookie_life; /* life I will award this cookie */ 198 uint32_t tie_tag_my_vtag; /* my tag in old association */ 199 200 uint32_t tie_tag_peer_vtag; /* peers tag in old association */ 201 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */ 202 203 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */ 204 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */ 205 uint32_t addr_type; /* address type */ 206 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */ 207 uint32_t laddr_type; /* my local from address type */ 208 uint32_t scope_id; /* v6 scope id for link-locals */ 209 210 uint16_t peerport; /* port address of the peer in the INIT */ 211 uint16_t myport; /* my port address used in the INIT */ 212 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */ 213 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */ 214 #if defined(__Userspace__) 215 uint8_t conn_addr_legal; 216 #endif 217 uint8_t local_scope; /* IPv6 local scope flag */ 218 uint8_t site_scope; /* IPv6 site scope flag */ 219 220 uint8_t ipv4_scope; /* IPv4 private addr scope */ 221 uint8_t loopback_scope; /* loopback scope information */ 222 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */ 223 /* 224 * at the end is tacked on the INIT chunk and the INIT-ACK chunk 225 * (minus the cookie). 226 */ 227 } SCTP_PACKED; 228 229 230 /* Used for NAT state error cause */ 231 struct sctp_missing_nat_state { 232 uint16_t cause; 233 uint16_t length; 234 uint8_t data[]; 235 } SCTP_PACKED; 236 237 238 struct sctp_inv_mandatory_param { 239 uint16_t cause; 240 uint16_t length; 241 uint32_t num_param; 242 uint16_t param; 243 /* 244 * We include this to 0 it since only a missing cookie will cause 245 * this error. 246 */ 247 uint16_t resv; 248 } SCTP_PACKED; 249 250 struct sctp_unresolv_addr { 251 uint16_t cause; 252 uint16_t length; 253 uint16_t addr_type; 254 uint16_t reserved; /* Only one invalid addr type */ 255 } SCTP_PACKED; 256 257 /* state cookie parameter */ 258 struct sctp_state_cookie_param { 259 struct sctp_paramhdr ph; 260 struct sctp_state_cookie cookie; 261 } SCTP_PACKED; 262 263 struct sctp_init_chunk { 264 struct sctp_chunkhdr ch; 265 struct sctp_init init; 266 } SCTP_PACKED; 267 268 struct sctp_init_msg { 269 struct sctphdr sh; 270 struct sctp_init_chunk msg; 271 } SCTP_PACKED; 272 273 /* ... used for both INIT and INIT ACK */ 274 #define sctp_init_ack sctp_init 275 #define sctp_init_ack_chunk sctp_init_chunk 276 #define sctp_init_ack_msg sctp_init_msg 277 278 279 /* Selective Ack (SACK) */ 280 struct sctp_gap_ack_block { 281 uint16_t start; /* Gap Ack block start */ 282 uint16_t end; /* Gap Ack block end */ 283 } SCTP_PACKED; 284 285 struct sctp_sack { 286 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 287 uint32_t a_rwnd; /* updated a_rwnd of sender */ 288 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 289 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 290 /* struct sctp_gap_ack_block's follow */ 291 /* uint32_t duplicate_tsn's follow */ 292 } SCTP_PACKED; 293 294 struct sctp_sack_chunk { 295 struct sctp_chunkhdr ch; 296 struct sctp_sack sack; 297 } SCTP_PACKED; 298 299 struct sctp_nr_sack { 300 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 301 uint32_t a_rwnd; /* updated a_rwnd of sender */ 302 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 303 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */ 304 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 305 uint16_t reserved; /* not currently used*/ 306 /* struct sctp_gap_ack_block's follow */ 307 /* uint32_t duplicate_tsn's follow */ 308 } SCTP_PACKED; 309 310 struct sctp_nr_sack_chunk { 311 struct sctp_chunkhdr ch; 312 struct sctp_nr_sack nr_sack; 313 } SCTP_PACKED; 314 315 316 /* Heartbeat Request (HEARTBEAT) */ 317 struct sctp_heartbeat { 318 struct sctp_heartbeat_info_param hb_info; 319 } SCTP_PACKED; 320 321 struct sctp_heartbeat_chunk { 322 struct sctp_chunkhdr ch; 323 struct sctp_heartbeat heartbeat; 324 } SCTP_PACKED; 325 326 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */ 327 #define sctp_heartbeat_ack sctp_heartbeat 328 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk 329 330 331 /* Abort Asssociation (ABORT) */ 332 struct sctp_abort_chunk { 333 struct sctp_chunkhdr ch; 334 /* optional error cause may follow */ 335 } SCTP_PACKED; 336 337 struct sctp_abort_msg { 338 struct sctphdr sh; 339 struct sctp_abort_chunk msg; 340 } SCTP_PACKED; 341 342 343 /* Shutdown Association (SHUTDOWN) */ 344 struct sctp_shutdown_chunk { 345 struct sctp_chunkhdr ch; 346 uint32_t cumulative_tsn_ack; 347 } SCTP_PACKED; 348 349 350 /* Shutdown Acknowledgment (SHUTDOWN ACK) */ 351 struct sctp_shutdown_ack_chunk { 352 struct sctp_chunkhdr ch; 353 } SCTP_PACKED; 354 355 356 /* Operation Error (ERROR) */ 357 struct sctp_error_chunk { 358 struct sctp_chunkhdr ch; 359 /* optional error causes follow */ 360 } SCTP_PACKED; 361 362 363 /* Cookie Echo (COOKIE ECHO) */ 364 struct sctp_cookie_echo_chunk { 365 struct sctp_chunkhdr ch; 366 struct sctp_state_cookie cookie; 367 } SCTP_PACKED; 368 369 /* Cookie Acknowledgment (COOKIE ACK) */ 370 struct sctp_cookie_ack_chunk { 371 struct sctp_chunkhdr ch; 372 } SCTP_PACKED; 373 374 /* Explicit Congestion Notification Echo (ECNE) */ 375 struct old_sctp_ecne_chunk { 376 struct sctp_chunkhdr ch; 377 uint32_t tsn; 378 } SCTP_PACKED; 379 380 struct sctp_ecne_chunk { 381 struct sctp_chunkhdr ch; 382 uint32_t tsn; 383 uint32_t num_pkts_since_cwr; 384 } SCTP_PACKED; 385 386 /* Congestion Window Reduced (CWR) */ 387 struct sctp_cwr_chunk { 388 struct sctp_chunkhdr ch; 389 uint32_t tsn; 390 } SCTP_PACKED; 391 392 /* Shutdown Complete (SHUTDOWN COMPLETE) */ 393 struct sctp_shutdown_complete_chunk { 394 struct sctp_chunkhdr ch; 395 } SCTP_PACKED; 396 397 /* Oper error holding a stale cookie */ 398 struct sctp_stale_cookie_msg { 399 struct sctp_paramhdr ph;/* really an error cause */ 400 uint32_t time_usec; 401 } SCTP_PACKED; 402 403 struct sctp_adaptation_layer_indication { 404 struct sctp_paramhdr ph; 405 uint32_t indication; 406 } SCTP_PACKED; 407 408 struct sctp_cookie_while_shutting_down { 409 struct sctphdr sh; 410 struct sctp_chunkhdr ch; 411 struct sctp_paramhdr ph;/* really an error cause */ 412 } SCTP_PACKED; 413 414 struct sctp_shutdown_complete_msg { 415 struct sctphdr sh; 416 struct sctp_shutdown_complete_chunk shut_cmp; 417 } SCTP_PACKED; 418 419 /* 420 * draft-ietf-tsvwg-addip-sctp 421 */ 422 /* Address/Stream Configuration Change (ASCONF) */ 423 struct sctp_asconf_chunk { 424 struct sctp_chunkhdr ch; 425 uint32_t serial_number; 426 /* lookup address parameter (mandatory) */ 427 /* asconf parameters follow */ 428 } SCTP_PACKED; 429 430 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */ 431 struct sctp_asconf_ack_chunk { 432 struct sctp_chunkhdr ch; 433 uint32_t serial_number; 434 /* asconf parameters follow */ 435 } SCTP_PACKED; 436 437 /* draft-ietf-tsvwg-prsctp */ 438 /* Forward Cumulative TSN (FORWARD TSN) */ 439 struct sctp_forward_tsn_chunk { 440 struct sctp_chunkhdr ch; 441 uint32_t new_cumulative_tsn; 442 /* stream/sequence pairs (sctp_strseq) follow */ 443 } SCTP_PACKED; 444 445 struct sctp_strseq { 446 uint16_t stream; 447 uint16_t sequence; 448 } SCTP_PACKED; 449 450 struct sctp_forward_tsn_msg { 451 struct sctphdr sh; 452 struct sctp_forward_tsn_chunk msg; 453 } SCTP_PACKED; 454 455 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */ 456 457 #define SCTP_NUM_DB_TO_VERIFY 31 458 459 struct sctp_chunk_desc { 460 uint8_t chunk_type; 461 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY]; 462 uint32_t tsn_ifany; 463 } SCTP_PACKED; 464 465 466 struct sctp_pktdrop_chunk { 467 struct sctp_chunkhdr ch; 468 uint32_t bottle_bw; 469 uint32_t current_onq; 470 uint16_t trunc_len; 471 uint16_t reserved; 472 uint8_t data[]; 473 } SCTP_PACKED; 474 475 /**********STREAM RESET STUFF ******************/ 476 477 struct sctp_stream_reset_out_request { 478 struct sctp_paramhdr ph; 479 uint32_t request_seq; /* monotonically increasing seq no */ 480 uint32_t response_seq; /* if a response, the resp seq no */ 481 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */ 482 uint16_t list_of_streams[]; /* if not all list of streams */ 483 } SCTP_PACKED; 484 485 struct sctp_stream_reset_in_request { 486 struct sctp_paramhdr ph; 487 uint32_t request_seq; 488 uint16_t list_of_streams[]; /* if not all list of streams */ 489 } SCTP_PACKED; 490 491 492 struct sctp_stream_reset_tsn_request { 493 struct sctp_paramhdr ph; 494 uint32_t request_seq; 495 } SCTP_PACKED; 496 497 struct sctp_stream_reset_response { 498 struct sctp_paramhdr ph; 499 uint32_t response_seq; /* if a response, the resp seq no */ 500 uint32_t result; 501 } SCTP_PACKED; 502 503 struct sctp_stream_reset_response_tsn { 504 struct sctp_paramhdr ph; 505 uint32_t response_seq; /* if a response, the resp seq no */ 506 uint32_t result; 507 uint32_t senders_next_tsn; 508 uint32_t receivers_next_tsn; 509 } SCTP_PACKED; 510 511 struct sctp_stream_reset_add_strm { 512 struct sctp_paramhdr ph; 513 uint32_t request_seq; 514 uint16_t number_of_streams; 515 uint16_t reserved; 516 } SCTP_PACKED; 517 518 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO 0x00000000 /* XXX: unused */ 519 #define SCTP_STREAM_RESET_RESULT_PERFORMED 0x00000001 520 #define SCTP_STREAM_RESET_RESULT_DENIED 0x00000002 521 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN 0x00000003 /* XXX: unused */ 522 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004 523 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO 0x00000005 524 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS 0x00000006 /* XXX: unused */ 525 526 /* 527 * convience structures, note that if you are making a request for specific 528 * streams then the request will need to be an overlay structure. 529 */ 530 531 struct sctp_stream_reset_tsn_req { 532 struct sctp_chunkhdr ch; 533 struct sctp_stream_reset_tsn_request sr_req; 534 } SCTP_PACKED; 535 536 struct sctp_stream_reset_resp { 537 struct sctp_chunkhdr ch; 538 struct sctp_stream_reset_response sr_resp; 539 } SCTP_PACKED; 540 541 /* respone only valid with a TSN request */ 542 struct sctp_stream_reset_resp_tsn { 543 struct sctp_chunkhdr ch; 544 struct sctp_stream_reset_response_tsn sr_resp; 545 } SCTP_PACKED; 546 547 /****************************************************/ 548 549 /* 550 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth 551 */ 552 553 /* Should we make the max be 32? */ 554 #define SCTP_RANDOM_MAX_SIZE 256 555 struct sctp_auth_random { 556 struct sctp_paramhdr ph;/* type = 0x8002 */ 557 uint8_t random_data[]; 558 } SCTP_PACKED; 559 560 struct sctp_auth_chunk_list { 561 struct sctp_paramhdr ph;/* type = 0x8003 */ 562 uint8_t chunk_types[]; 563 } SCTP_PACKED; 564 565 struct sctp_auth_hmac_algo { 566 struct sctp_paramhdr ph;/* type = 0x8004 */ 567 uint16_t hmac_ids[]; 568 } SCTP_PACKED; 569 570 struct sctp_auth_chunk { 571 struct sctp_chunkhdr ch; 572 uint16_t shared_key_id; 573 uint16_t hmac_id; 574 uint8_t hmac[]; 575 } SCTP_PACKED; 576 577 struct sctp_auth_invalid_hmac { 578 struct sctp_paramhdr ph; 579 uint16_t hmac_id; 580 uint16_t padding; 581 } SCTP_PACKED; 582 583 /* 584 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing 585 * pieces. If ENCE is missing we could have a couple of blocks. This way we 586 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size 587 * data chunk I will split into. We could increase throughput slightly by 588 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I 589 * feel is worth it for now. 590 */ 591 #ifndef SCTP_MAX_OVERHEAD 592 #ifdef INET6 593 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 594 sizeof(struct sctphdr) + \ 595 sizeof(struct sctp_ecne_chunk) + \ 596 sizeof(struct sctp_sack_chunk) + \ 597 sizeof(struct ip6_hdr)) 598 599 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 600 sizeof(struct sctphdr) + \ 601 sizeof(struct ip6_hdr)) 602 603 604 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \ 605 sizeof(struct sctphdr)) 606 607 #else 608 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 609 sizeof(struct sctphdr) + \ 610 sizeof(struct sctp_ecne_chunk) + \ 611 sizeof(struct sctp_sack_chunk) + \ 612 sizeof(struct ip)) 613 614 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 615 sizeof(struct sctphdr) + \ 616 sizeof(struct ip)) 617 618 619 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \ 620 sizeof(struct sctphdr)) 621 622 #endif /* INET6 */ 623 #endif /* !SCTP_MAX_OVERHEAD */ 624 625 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 626 sizeof(struct sctphdr) + \ 627 sizeof(struct ip)) 628 629 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \ 630 sizeof(struct sctphdr)) 631 632 #if defined(__Windows__) 633 #include <packoff.h> 634 #endif 635 #if defined(__Userspace_os_Windows) 636 #pragma pack () 637 #endif 638 #undef SCTP_PACKED 639 #endif /* !__sctp_header_h__ */ 640