1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, 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 /* $KAME: sctp_header.h,v 1.14 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef __sctp_header_h__ 39 #define __sctp_header_h__ 40 41 #include <sys/time.h> 42 #include <netinet/sctp.h> 43 #include <netinet/sctp_constants.h> 44 45 #define SCTP_PACKED __attribute__((packed)) 46 47 /* 48 * Parameter structures 49 */ 50 struct sctp_ipv4addr_param { 51 struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */ 52 uint32_t addr; /* IPV4 address */ 53 } SCTP_PACKED; 54 55 #define SCTP_V6_ADDR_BYTES 16 56 57 58 struct sctp_ipv6addr_param { 59 struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */ 60 uint8_t addr[SCTP_V6_ADDR_BYTES]; /* IPV6 address */ 61 } SCTP_PACKED; 62 63 /* Cookie Preservative */ 64 struct sctp_cookie_perserve_param { 65 struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */ 66 uint32_t time; /* time in ms to extend cookie */ 67 } SCTP_PACKED; 68 69 #define SCTP_ARRAY_MIN_LEN 1 70 /* Host Name Address */ 71 struct sctp_host_name_param { 72 struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */ 73 char name[SCTP_ARRAY_MIN_LEN]; /* host name */ 74 } SCTP_PACKED; 75 76 /* 77 * This is the maximum padded size of a s-a-p 78 * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12 79 */ 80 #define SCTP_MAX_ADDR_PARAMS_SIZE 12 81 /* supported address type */ 82 struct sctp_supported_addr_param { 83 struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */ 84 uint16_t addr_type[SCTP_ARRAY_MIN_LEN]; /* array of supported address 85 * types */ 86 } SCTP_PACKED; 87 88 /* ECN parameter */ 89 struct sctp_ecn_supported_param { 90 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */ 91 } SCTP_PACKED; 92 93 94 /* heartbeat info parameter */ 95 struct sctp_heartbeat_info_param { 96 struct sctp_paramhdr ph; 97 uint32_t time_value_1; 98 uint32_t time_value_2; 99 uint32_t random_value1; 100 uint32_t random_value2; 101 uint8_t addr_family; 102 uint8_t addr_len; 103 /* make sure that this structure is 4 byte aligned */ 104 uint8_t padding[2]; 105 char address[SCTP_ADDRMAX]; 106 } SCTP_PACKED; 107 108 109 /* draft-ietf-tsvwg-prsctp */ 110 /* PR-SCTP supported parameter */ 111 struct sctp_prsctp_supported_param { 112 struct sctp_paramhdr ph; 113 } SCTP_PACKED; 114 115 116 /* draft-ietf-tsvwg-addip-sctp */ 117 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */ 118 struct sctp_paramhdr ph;/* a SCTP parameter header */ 119 uint32_t correlation_id;/* correlation id for this param */ 120 } SCTP_PACKED; 121 122 struct sctp_asconf_addr_param { /* an ASCONF address parameter */ 123 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 124 struct sctp_ipv6addr_param addrp; /* max storage size */ 125 } SCTP_PACKED; 126 127 128 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */ 129 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 130 uint32_t local_vtag; 131 uint32_t remote_vtag; 132 } SCTP_PACKED; 133 134 135 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */ 136 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */ 137 struct sctp_ipv4addr_param addrp; /* max storage size */ 138 } SCTP_PACKED; 139 140 #define SCTP_MAX_SUPPORTED_EXT 256 141 142 struct sctp_supported_chunk_types_param { 143 struct sctp_paramhdr ph;/* type = 0x8008 len = x */ 144 uint8_t chunk_types[]; 145 } SCTP_PACKED; 146 147 148 /* 149 * Structures for DATA chunks 150 */ 151 struct sctp_data { 152 uint32_t tsn; 153 uint16_t stream_id; 154 uint16_t stream_sequence; 155 uint32_t protocol_id; 156 /* user data follows */ 157 } SCTP_PACKED; 158 159 struct sctp_data_chunk { 160 struct sctp_chunkhdr ch; 161 struct sctp_data dp; 162 } SCTP_PACKED; 163 164 /* 165 * Structures for the control chunks 166 */ 167 168 /* Initiate (INIT)/Initiate Ack (INIT ACK) */ 169 struct sctp_init { 170 uint32_t initiate_tag; /* initiate tag */ 171 uint32_t a_rwnd; /* a_rwnd */ 172 uint16_t num_outbound_streams; /* OS */ 173 uint16_t num_inbound_streams; /* MIS */ 174 uint32_t initial_tsn; /* I-TSN */ 175 /* optional param's follow */ 176 } SCTP_PACKED; 177 178 #define SCTP_IDENTIFICATION_SIZE 16 179 #define SCTP_ADDRESS_SIZE 4 180 #define SCTP_RESERVE_SPACE 6 181 /* state cookie header */ 182 struct sctp_state_cookie { /* this is our definition... */ 183 uint8_t identification[SCTP_IDENTIFICATION_SIZE]; /* id of who we are */ 184 struct timeval time_entered; /* the time I built cookie */ 185 uint32_t cookie_life; /* life I will award this cookie */ 186 uint32_t tie_tag_my_vtag; /* my tag in old association */ 187 188 uint32_t tie_tag_peer_vtag; /* peers tag in old association */ 189 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */ 190 191 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */ 192 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */ 193 uint32_t addr_type; /* address type */ 194 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */ 195 uint32_t laddr_type; /* my local from address type */ 196 uint32_t scope_id; /* v6 scope id for link-locals */ 197 198 uint16_t peerport; /* port address of the peer in the INIT */ 199 uint16_t myport; /* my port address used in the INIT */ 200 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */ 201 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */ 202 uint8_t local_scope; /* IPv6 local scope flag */ 203 uint8_t site_scope; /* IPv6 site scope flag */ 204 205 uint8_t ipv4_scope; /* IPv4 private addr scope */ 206 uint8_t loopback_scope; /* loopback scope information */ 207 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */ 208 /* 209 * at the end is tacked on the INIT chunk and the INIT-ACK chunk 210 * (minus the cookie). 211 */ 212 } SCTP_PACKED; 213 214 215 /* Used for NAT state error cause */ 216 struct sctp_missing_nat_state { 217 uint16_t cause; 218 uint16_t length; 219 uint8_t data[]; 220 } SCTP_PACKED; 221 222 223 struct sctp_inv_mandatory_param { 224 uint16_t cause; 225 uint16_t length; 226 uint32_t num_param; 227 uint16_t param; 228 /* 229 * We include this to 0 it since only a missing cookie will cause 230 * this error. 231 */ 232 uint16_t resv; 233 } SCTP_PACKED; 234 235 struct sctp_unresolv_addr { 236 uint16_t cause; 237 uint16_t length; 238 uint16_t addr_type; 239 uint16_t reserved; /* Only one invalid addr type */ 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 /* Oper error holding a stale cookie */ 383 struct sctp_stale_cookie_msg { 384 struct sctp_paramhdr ph;/* really an error cause */ 385 uint32_t time_usec; 386 } SCTP_PACKED; 387 388 struct sctp_adaptation_layer_indication { 389 struct sctp_paramhdr ph; 390 uint32_t indication; 391 } SCTP_PACKED; 392 393 struct sctp_cookie_while_shutting_down { 394 struct sctphdr sh; 395 struct sctp_chunkhdr ch; 396 struct sctp_paramhdr ph;/* really an error cause */ 397 } SCTP_PACKED; 398 399 struct sctp_shutdown_complete_msg { 400 struct sctphdr sh; 401 struct sctp_shutdown_complete_chunk shut_cmp; 402 } SCTP_PACKED; 403 404 /* 405 * draft-ietf-tsvwg-addip-sctp 406 */ 407 /* Address/Stream Configuration Change (ASCONF) */ 408 struct sctp_asconf_chunk { 409 struct sctp_chunkhdr ch; 410 uint32_t serial_number; 411 /* lookup address parameter (mandatory) */ 412 /* asconf parameters follow */ 413 } SCTP_PACKED; 414 415 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */ 416 struct sctp_asconf_ack_chunk { 417 struct sctp_chunkhdr ch; 418 uint32_t serial_number; 419 /* asconf parameters follow */ 420 } SCTP_PACKED; 421 422 /* draft-ietf-tsvwg-prsctp */ 423 /* Forward Cumulative TSN (FORWARD TSN) */ 424 struct sctp_forward_tsn_chunk { 425 struct sctp_chunkhdr ch; 426 uint32_t new_cumulative_tsn; 427 /* stream/sequence pairs (sctp_strseq) follow */ 428 } SCTP_PACKED; 429 430 struct sctp_strseq { 431 uint16_t stream; 432 uint16_t sequence; 433 } SCTP_PACKED; 434 435 struct sctp_forward_tsn_msg { 436 struct sctphdr sh; 437 struct sctp_forward_tsn_chunk msg; 438 } SCTP_PACKED; 439 440 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */ 441 442 #define SCTP_NUM_DB_TO_VERIFY 31 443 444 struct sctp_chunk_desc { 445 uint8_t chunk_type; 446 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY]; 447 uint32_t tsn_ifany; 448 } SCTP_PACKED; 449 450 451 struct sctp_pktdrop_chunk { 452 struct sctp_chunkhdr ch; 453 uint32_t bottle_bw; 454 uint32_t current_onq; 455 uint16_t trunc_len; 456 uint16_t reserved; 457 uint8_t data[]; 458 } SCTP_PACKED; 459 460 /**********STREAM RESET STUFF ******************/ 461 462 struct sctp_stream_reset_out_request { 463 struct sctp_paramhdr ph; 464 uint32_t request_seq; /* monotonically increasing seq no */ 465 uint32_t response_seq; /* if a response, the resp seq no */ 466 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */ 467 uint16_t list_of_streams[]; /* if not all list of streams */ 468 } SCTP_PACKED; 469 470 struct sctp_stream_reset_in_request { 471 struct sctp_paramhdr ph; 472 uint32_t request_seq; 473 uint16_t list_of_streams[]; /* if not all list of streams */ 474 } SCTP_PACKED; 475 476 477 struct sctp_stream_reset_tsn_request { 478 struct sctp_paramhdr ph; 479 uint32_t request_seq; 480 } SCTP_PACKED; 481 482 struct sctp_stream_reset_response { 483 struct sctp_paramhdr ph; 484 uint32_t response_seq; /* if a response, the resp seq no */ 485 uint32_t result; 486 } SCTP_PACKED; 487 488 struct sctp_stream_reset_response_tsn { 489 struct sctp_paramhdr ph; 490 uint32_t response_seq; /* if a response, the resp seq no */ 491 uint32_t result; 492 uint32_t senders_next_tsn; 493 uint32_t receivers_next_tsn; 494 } SCTP_PACKED; 495 496 struct sctp_stream_reset_add_strm { 497 struct sctp_paramhdr ph; 498 uint32_t request_seq; 499 uint16_t number_of_streams; 500 uint16_t reserved; 501 } SCTP_PACKED; 502 503 #define SCTP_STREAM_RESET_NOTHING 0x00000000 /* Nothing for me to do */ 504 #define SCTP_STREAM_RESET_PERFORMED 0x00000001 /* Did it */ 505 #define SCTP_STREAM_RESET_DENIED 0x00000002 /* refused to do it */ 506 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003 /* bad Stream no */ 507 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004 /* collision, try again */ 508 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005 /* bad str-reset seq no */ 509 510 /* 511 * convience structures, note that if you are making a request for specific 512 * streams then the request will need to be an overlay structure. 513 */ 514 515 struct sctp_stream_reset_out_req { 516 struct sctp_chunkhdr ch; 517 struct sctp_stream_reset_out_request sr_req; 518 } SCTP_PACKED; 519 520 struct sctp_stream_reset_in_req { 521 struct sctp_chunkhdr ch; 522 struct sctp_stream_reset_in_request sr_req; 523 } SCTP_PACKED; 524 525 struct sctp_stream_reset_tsn_req { 526 struct sctp_chunkhdr ch; 527 struct sctp_stream_reset_tsn_request sr_req; 528 } SCTP_PACKED; 529 530 struct sctp_stream_reset_resp { 531 struct sctp_chunkhdr ch; 532 struct sctp_stream_reset_response sr_resp; 533 } SCTP_PACKED; 534 535 /* respone only valid with a TSN request */ 536 struct sctp_stream_reset_resp_tsn { 537 struct sctp_chunkhdr ch; 538 struct sctp_stream_reset_response_tsn sr_resp; 539 } SCTP_PACKED; 540 541 /****************************************************/ 542 543 /* 544 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth 545 */ 546 547 /* Should we make the max be 32? */ 548 #define SCTP_RANDOM_MAX_SIZE 256 549 struct sctp_auth_random { 550 struct sctp_paramhdr ph;/* type = 0x8002 */ 551 uint8_t random_data[]; 552 } SCTP_PACKED; 553 554 struct sctp_auth_chunk_list { 555 struct sctp_paramhdr ph;/* type = 0x8003 */ 556 uint8_t chunk_types[]; 557 } SCTP_PACKED; 558 559 struct sctp_auth_hmac_algo { 560 struct sctp_paramhdr ph;/* type = 0x8004 */ 561 uint16_t hmac_ids[]; 562 } SCTP_PACKED; 563 564 struct sctp_auth_chunk { 565 struct sctp_chunkhdr ch; 566 uint16_t shared_key_id; 567 uint16_t hmac_id; 568 uint8_t hmac[]; 569 } SCTP_PACKED; 570 571 struct sctp_auth_invalid_hmac { 572 struct sctp_paramhdr ph; 573 uint16_t hmac_id; 574 uint16_t padding; 575 } SCTP_PACKED; 576 577 /* 578 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing 579 * pieces. If ENCE is missing we could have a couple of blocks. This way we 580 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size 581 * data chunk I will split into. We could increase throughput slightly by 582 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I 583 * feel is worth it for now. 584 */ 585 #ifndef SCTP_MAX_OVERHEAD 586 #ifdef INET6 587 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 588 sizeof(struct sctphdr) + \ 589 sizeof(struct sctp_ecne_chunk) + \ 590 sizeof(struct sctp_sack_chunk) + \ 591 sizeof(struct ip6_hdr)) 592 593 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 594 sizeof(struct sctphdr) + \ 595 sizeof(struct ip6_hdr)) 596 597 598 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \ 599 sizeof(struct sctphdr)) 600 601 #else 602 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 603 sizeof(struct sctphdr) + \ 604 sizeof(struct sctp_ecne_chunk) + \ 605 sizeof(struct sctp_sack_chunk) + \ 606 sizeof(struct ip)) 607 608 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 609 sizeof(struct sctphdr) + \ 610 sizeof(struct ip)) 611 612 613 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \ 614 sizeof(struct sctphdr)) 615 616 #endif /* INET6 */ 617 #endif /* !SCTP_MAX_OVERHEAD */ 618 619 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 620 sizeof(struct sctphdr) + \ 621 sizeof(struct ip)) 622 623 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \ 624 sizeof(struct sctphdr)) 625 626 #undef SCTP_PACKED 627 #endif /* !__sctp_header_h__ */ 628