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