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 /* ECN parameter */ 86 struct sctp_ecn_supported_param { 87 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */ 88 } SCTP_PACKED; 89 90 91 /* heartbeat info parameter */ 92 struct sctp_heartbeat_info_param { 93 struct sctp_paramhdr ph; 94 uint32_t time_value_1; 95 uint32_t time_value_2; 96 uint32_t random_value1; 97 uint32_t random_value2; 98 uint8_t addr_family; 99 uint8_t addr_len; 100 /* make sure that this structure is 4 byte aligned */ 101 uint8_t padding[2]; 102 char address[SCTP_ADDRMAX]; 103 } SCTP_PACKED; 104 105 106 /* draft-ietf-tsvwg-prsctp */ 107 /* PR-SCTP supported parameter */ 108 struct sctp_prsctp_supported_param { 109 struct sctp_paramhdr ph; 110 } SCTP_PACKED; 111 112 113 /* draft-ietf-tsvwg-addip-sctp */ 114 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */ 115 struct sctp_paramhdr ph;/* a SCTP parameter header */ 116 uint32_t correlation_id;/* correlation id for this param */ 117 } SCTP_PACKED; 118 119 struct sctp_asconf_addr_param { /* an ASCONF address parameter */ 120 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 121 struct sctp_ipv6addr_param addrp; /* max storage size */ 122 } SCTP_PACKED; 123 124 125 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */ 126 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 127 uint32_t local_vtag; 128 uint32_t remote_vtag; 129 } SCTP_PACKED; 130 131 132 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */ 133 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 134 struct sctp_ipv4addr_param addrp; /* max storage size */ 135 } SCTP_PACKED; 136 137 #define SCTP_MAX_SUPPORTED_EXT 256 138 139 struct sctp_supported_chunk_types_param { 140 struct sctp_paramhdr ph;/* type = 0x8008 len = x */ 141 uint8_t chunk_types[]; 142 } SCTP_PACKED; 143 144 145 /* 146 * Structures for DATA chunks 147 */ 148 struct sctp_data { 149 uint32_t tsn; 150 uint16_t stream_id; 151 uint16_t stream_sequence; 152 uint32_t protocol_id; 153 /* user data follows */ 154 } SCTP_PACKED; 155 156 struct sctp_data_chunk { 157 struct sctp_chunkhdr ch; 158 struct sctp_data dp; 159 } SCTP_PACKED; 160 161 /* 162 * Structures for the control chunks 163 */ 164 165 /* Initiate (INIT)/Initiate Ack (INIT ACK) */ 166 struct sctp_init { 167 uint32_t initiate_tag; /* initiate tag */ 168 uint32_t a_rwnd; /* a_rwnd */ 169 uint16_t num_outbound_streams; /* OS */ 170 uint16_t num_inbound_streams; /* MIS */ 171 uint32_t initial_tsn; /* I-TSN */ 172 /* optional param's follow */ 173 } SCTP_PACKED; 174 175 #define SCTP_IDENTIFICATION_SIZE 16 176 #define SCTP_ADDRESS_SIZE 4 177 #define SCTP_RESERVE_SPACE 6 178 /* state cookie header */ 179 struct sctp_state_cookie { /* this is our definition... */ 180 uint8_t identification[SCTP_IDENTIFICATION_SIZE]; /* id of who we are */ 181 struct timeval time_entered; /* the time I built cookie */ 182 uint32_t cookie_life; /* life I will award this cookie */ 183 uint32_t tie_tag_my_vtag; /* my tag in old association */ 184 185 uint32_t tie_tag_peer_vtag; /* peers tag in old association */ 186 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */ 187 188 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */ 189 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */ 190 uint32_t addr_type; /* address type */ 191 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */ 192 uint32_t laddr_type; /* my local from address type */ 193 uint32_t scope_id; /* v6 scope id for link-locals */ 194 195 uint16_t peerport; /* port address of the peer in the INIT */ 196 uint16_t myport; /* my port address used in the INIT */ 197 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */ 198 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */ 199 uint8_t local_scope; /* IPv6 local scope flag */ 200 uint8_t site_scope; /* IPv6 site scope flag */ 201 202 uint8_t ipv4_scope; /* IPv4 private addr scope */ 203 uint8_t loopback_scope; /* loopback scope information */ 204 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */ 205 /* 206 * at the end is tacked on the INIT chunk and the INIT-ACK chunk 207 * (minus the cookie). 208 */ 209 } SCTP_PACKED; 210 211 212 /* Used for NAT state error cause */ 213 struct sctp_missing_nat_state { 214 uint16_t cause; 215 uint16_t length; 216 uint8_t data[]; 217 } SCTP_PACKED; 218 219 220 struct sctp_inv_mandatory_param { 221 uint16_t cause; 222 uint16_t length; 223 uint32_t num_param; 224 uint16_t param; 225 /* 226 * We include this to 0 it since only a missing cookie will cause 227 * this error. 228 */ 229 uint16_t resv; 230 } SCTP_PACKED; 231 232 struct sctp_unresolv_addr { 233 uint16_t cause; 234 uint16_t length; 235 uint16_t addr_type; 236 uint16_t reserved; /* Only one invalid addr type */ 237 } SCTP_PACKED; 238 239 /* state cookie parameter */ 240 struct sctp_state_cookie_param { 241 struct sctp_paramhdr ph; 242 struct sctp_state_cookie cookie; 243 } SCTP_PACKED; 244 245 struct sctp_init_chunk { 246 struct sctp_chunkhdr ch; 247 struct sctp_init init; 248 } SCTP_PACKED; 249 250 struct sctp_init_msg { 251 struct sctphdr sh; 252 struct sctp_init_chunk msg; 253 } SCTP_PACKED; 254 255 /* ... used for both INIT and INIT ACK */ 256 #define sctp_init_ack sctp_init 257 #define sctp_init_ack_chunk sctp_init_chunk 258 #define sctp_init_ack_msg sctp_init_msg 259 260 261 /* Selective Ack (SACK) */ 262 struct sctp_gap_ack_block { 263 uint16_t start; /* Gap Ack block start */ 264 uint16_t end; /* Gap Ack block end */ 265 } SCTP_PACKED; 266 267 struct sctp_sack { 268 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 269 uint32_t a_rwnd; /* updated a_rwnd of sender */ 270 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 271 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 272 /* struct sctp_gap_ack_block's follow */ 273 /* uint32_t duplicate_tsn's follow */ 274 } SCTP_PACKED; 275 276 struct sctp_sack_chunk { 277 struct sctp_chunkhdr ch; 278 struct sctp_sack sack; 279 } SCTP_PACKED; 280 281 struct sctp_nr_sack { 282 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 283 uint32_t a_rwnd; /* updated a_rwnd of sender */ 284 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 285 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */ 286 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 287 uint16_t reserved; /* not currently used */ 288 /* struct sctp_gap_ack_block's follow */ 289 /* uint32_t duplicate_tsn's follow */ 290 } SCTP_PACKED; 291 292 struct sctp_nr_sack_chunk { 293 struct sctp_chunkhdr ch; 294 struct sctp_nr_sack nr_sack; 295 } SCTP_PACKED; 296 297 298 /* Heartbeat Request (HEARTBEAT) */ 299 struct sctp_heartbeat { 300 struct sctp_heartbeat_info_param hb_info; 301 } SCTP_PACKED; 302 303 struct sctp_heartbeat_chunk { 304 struct sctp_chunkhdr ch; 305 struct sctp_heartbeat heartbeat; 306 } SCTP_PACKED; 307 308 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */ 309 #define sctp_heartbeat_ack sctp_heartbeat 310 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk 311 312 313 /* Abort Asssociation (ABORT) */ 314 struct sctp_abort_chunk { 315 struct sctp_chunkhdr ch; 316 /* optional error cause may follow */ 317 } SCTP_PACKED; 318 319 struct sctp_abort_msg { 320 struct sctphdr sh; 321 struct sctp_abort_chunk msg; 322 } SCTP_PACKED; 323 324 325 /* Shutdown Association (SHUTDOWN) */ 326 struct sctp_shutdown_chunk { 327 struct sctp_chunkhdr ch; 328 uint32_t cumulative_tsn_ack; 329 } SCTP_PACKED; 330 331 332 /* Shutdown Acknowledgment (SHUTDOWN ACK) */ 333 struct sctp_shutdown_ack_chunk { 334 struct sctp_chunkhdr ch; 335 } SCTP_PACKED; 336 337 338 /* Operation Error (ERROR) */ 339 struct sctp_error_chunk { 340 struct sctp_chunkhdr ch; 341 /* optional error causes follow */ 342 } SCTP_PACKED; 343 344 345 /* Cookie Echo (COOKIE ECHO) */ 346 struct sctp_cookie_echo_chunk { 347 struct sctp_chunkhdr ch; 348 struct sctp_state_cookie cookie; 349 } SCTP_PACKED; 350 351 /* Cookie Acknowledgment (COOKIE ACK) */ 352 struct sctp_cookie_ack_chunk { 353 struct sctp_chunkhdr ch; 354 } SCTP_PACKED; 355 356 /* Explicit Congestion Notification Echo (ECNE) */ 357 struct old_sctp_ecne_chunk { 358 struct sctp_chunkhdr ch; 359 uint32_t tsn; 360 } SCTP_PACKED; 361 362 struct sctp_ecne_chunk { 363 struct sctp_chunkhdr ch; 364 uint32_t tsn; 365 uint32_t num_pkts_since_cwr; 366 } SCTP_PACKED; 367 368 /* Congestion Window Reduced (CWR) */ 369 struct sctp_cwr_chunk { 370 struct sctp_chunkhdr ch; 371 uint32_t tsn; 372 } SCTP_PACKED; 373 374 /* Shutdown Complete (SHUTDOWN COMPLETE) */ 375 struct sctp_shutdown_complete_chunk { 376 struct sctp_chunkhdr ch; 377 } SCTP_PACKED; 378 379 /* Oper error holding a stale cookie */ 380 struct sctp_stale_cookie_msg { 381 struct sctp_paramhdr ph;/* really an error cause */ 382 uint32_t time_usec; 383 } SCTP_PACKED; 384 385 struct sctp_adaptation_layer_indication { 386 struct sctp_paramhdr ph; 387 uint32_t indication; 388 } SCTP_PACKED; 389 390 struct sctp_cookie_while_shutting_down { 391 struct sctphdr sh; 392 struct sctp_chunkhdr ch; 393 struct sctp_paramhdr ph;/* really an error cause */ 394 } SCTP_PACKED; 395 396 struct sctp_shutdown_complete_msg { 397 struct sctphdr sh; 398 struct sctp_shutdown_complete_chunk shut_cmp; 399 } SCTP_PACKED; 400 401 /* 402 * draft-ietf-tsvwg-addip-sctp 403 */ 404 /* Address/Stream Configuration Change (ASCONF) */ 405 struct sctp_asconf_chunk { 406 struct sctp_chunkhdr ch; 407 uint32_t serial_number; 408 /* lookup address parameter (mandatory) */ 409 /* asconf parameters follow */ 410 } SCTP_PACKED; 411 412 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */ 413 struct sctp_asconf_ack_chunk { 414 struct sctp_chunkhdr ch; 415 uint32_t serial_number; 416 /* asconf parameters follow */ 417 } SCTP_PACKED; 418 419 /* draft-ietf-tsvwg-prsctp */ 420 /* Forward Cumulative TSN (FORWARD TSN) */ 421 struct sctp_forward_tsn_chunk { 422 struct sctp_chunkhdr ch; 423 uint32_t new_cumulative_tsn; 424 /* stream/sequence pairs (sctp_strseq) follow */ 425 } SCTP_PACKED; 426 427 struct sctp_strseq { 428 uint16_t stream; 429 uint16_t sequence; 430 } SCTP_PACKED; 431 432 struct sctp_forward_tsn_msg { 433 struct sctphdr sh; 434 struct sctp_forward_tsn_chunk msg; 435 } SCTP_PACKED; 436 437 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */ 438 439 #define SCTP_NUM_DB_TO_VERIFY 31 440 441 struct sctp_chunk_desc { 442 uint8_t chunk_type; 443 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY]; 444 uint32_t tsn_ifany; 445 } SCTP_PACKED; 446 447 448 struct sctp_pktdrop_chunk { 449 struct sctp_chunkhdr ch; 450 uint32_t bottle_bw; 451 uint32_t current_onq; 452 uint16_t trunc_len; 453 uint16_t reserved; 454 uint8_t data[]; 455 } SCTP_PACKED; 456 457 /**********STREAM RESET STUFF ******************/ 458 459 struct sctp_stream_reset_out_request { 460 struct sctp_paramhdr ph; 461 uint32_t request_seq; /* monotonically increasing seq no */ 462 uint32_t response_seq; /* if a response, the resp seq no */ 463 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */ 464 uint16_t list_of_streams[]; /* if not all list of streams */ 465 } SCTP_PACKED; 466 467 struct sctp_stream_reset_in_request { 468 struct sctp_paramhdr ph; 469 uint32_t request_seq; 470 uint16_t list_of_streams[]; /* if not all list of streams */ 471 } SCTP_PACKED; 472 473 474 struct sctp_stream_reset_tsn_request { 475 struct sctp_paramhdr ph; 476 uint32_t request_seq; 477 } SCTP_PACKED; 478 479 struct sctp_stream_reset_response { 480 struct sctp_paramhdr ph; 481 uint32_t response_seq; /* if a response, the resp seq no */ 482 uint32_t result; 483 } SCTP_PACKED; 484 485 struct sctp_stream_reset_response_tsn { 486 struct sctp_paramhdr ph; 487 uint32_t response_seq; /* if a response, the resp seq no */ 488 uint32_t result; 489 uint32_t senders_next_tsn; 490 uint32_t receivers_next_tsn; 491 } SCTP_PACKED; 492 493 struct sctp_stream_reset_add_strm { 494 struct sctp_paramhdr ph; 495 uint32_t request_seq; 496 uint16_t number_of_streams; 497 uint16_t reserved; 498 } SCTP_PACKED; 499 500 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO 0x00000000 /* XXX: unused */ 501 #define SCTP_STREAM_RESET_RESULT_PERFORMED 0x00000001 502 #define SCTP_STREAM_RESET_RESULT_DENIED 0x00000002 503 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN 0x00000003 /* XXX: unused */ 504 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004 505 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO 0x00000005 506 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS 0x00000006 /* XXX: unused */ 507 508 /* 509 * convience structures, note that if you are making a request for specific 510 * streams then the request will need to be an overlay structure. 511 */ 512 513 struct sctp_stream_reset_tsn_req { 514 struct sctp_chunkhdr ch; 515 struct sctp_stream_reset_tsn_request sr_req; 516 } SCTP_PACKED; 517 518 struct sctp_stream_reset_resp { 519 struct sctp_chunkhdr ch; 520 struct sctp_stream_reset_response sr_resp; 521 } SCTP_PACKED; 522 523 /* respone only valid with a TSN request */ 524 struct sctp_stream_reset_resp_tsn { 525 struct sctp_chunkhdr ch; 526 struct sctp_stream_reset_response_tsn sr_resp; 527 } SCTP_PACKED; 528 529 /****************************************************/ 530 531 /* 532 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth 533 */ 534 535 /* Should we make the max be 32? */ 536 #define SCTP_RANDOM_MAX_SIZE 256 537 struct sctp_auth_random { 538 struct sctp_paramhdr ph;/* type = 0x8002 */ 539 uint8_t random_data[]; 540 } SCTP_PACKED; 541 542 struct sctp_auth_chunk_list { 543 struct sctp_paramhdr ph;/* type = 0x8003 */ 544 uint8_t chunk_types[]; 545 } SCTP_PACKED; 546 547 struct sctp_auth_hmac_algo { 548 struct sctp_paramhdr ph;/* type = 0x8004 */ 549 uint16_t hmac_ids[]; 550 } SCTP_PACKED; 551 552 struct sctp_auth_chunk { 553 struct sctp_chunkhdr ch; 554 uint16_t shared_key_id; 555 uint16_t hmac_id; 556 uint8_t hmac[]; 557 } SCTP_PACKED; 558 559 struct sctp_auth_invalid_hmac { 560 struct sctp_paramhdr ph; 561 uint16_t hmac_id; 562 uint16_t padding; 563 } SCTP_PACKED; 564 565 /* 566 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing 567 * pieces. If ENCE is missing we could have a couple of blocks. This way we 568 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size 569 * data chunk I will split into. We could increase throughput slightly by 570 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I 571 * feel is worth it for now. 572 */ 573 #ifndef SCTP_MAX_OVERHEAD 574 #ifdef INET6 575 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 576 sizeof(struct sctphdr) + \ 577 sizeof(struct sctp_ecne_chunk) + \ 578 sizeof(struct sctp_sack_chunk) + \ 579 sizeof(struct ip6_hdr)) 580 581 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 582 sizeof(struct sctphdr) + \ 583 sizeof(struct ip6_hdr)) 584 585 586 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \ 587 sizeof(struct sctphdr)) 588 589 #else 590 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 591 sizeof(struct sctphdr) + \ 592 sizeof(struct sctp_ecne_chunk) + \ 593 sizeof(struct sctp_sack_chunk) + \ 594 sizeof(struct ip)) 595 596 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 597 sizeof(struct sctphdr) + \ 598 sizeof(struct ip)) 599 600 601 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \ 602 sizeof(struct sctphdr)) 603 604 #endif /* INET6 */ 605 #endif /* !SCTP_MAX_OVERHEAD */ 606 607 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 608 sizeof(struct sctphdr) + \ 609 sizeof(struct ip)) 610 611 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \ 612 sizeof(struct sctphdr)) 613 614 #undef SCTP_PACKED 615 #endif /* !__sctp_header_h__ */ 616