1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_header.h,v 1.14 2005/03/06 16:04:17 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #ifndef __sctp_header_h__ 37 #define __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[SCTP_ARRAY_MIN_LEN]; /* array of supported address 83 * types */ 84 } SCTP_PACKED; 85 86 /* ECN parameter */ 87 struct sctp_ecn_supported_param { 88 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */ 89 } SCTP_PACKED; 90 91 92 /* heartbeat info parameter */ 93 struct sctp_heartbeat_info_param { 94 struct sctp_paramhdr ph; 95 uint32_t time_value_1; 96 uint32_t time_value_2; 97 uint32_t random_value1; 98 uint32_t random_value2; 99 uint16_t user_req; 100 uint8_t addr_family; 101 uint8_t addr_len; 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 /* ECN Nonce: draft-ladha-sctp-ecn-nonce */ 146 struct sctp_ecn_nonce_supported_param { 147 struct sctp_paramhdr ph;/* type = 0x8001 len = 4 */ 148 } SCTP_PACKED; 149 150 151 /* 152 * Structures for DATA chunks 153 */ 154 struct sctp_data { 155 uint32_t tsn; 156 uint16_t stream_id; 157 uint16_t stream_sequence; 158 uint32_t protocol_id; 159 /* user data follows */ 160 } SCTP_PACKED; 161 162 struct sctp_data_chunk { 163 struct sctp_chunkhdr ch; 164 struct sctp_data dp; 165 } SCTP_PACKED; 166 167 /* 168 * Structures for the control chunks 169 */ 170 171 /* Initiate (INIT)/Initiate Ack (INIT ACK) */ 172 struct sctp_init { 173 uint32_t initiate_tag; /* initiate tag */ 174 uint32_t a_rwnd; /* a_rwnd */ 175 uint16_t num_outbound_streams; /* OS */ 176 uint16_t num_inbound_streams; /* MIS */ 177 uint32_t initial_tsn; /* I-TSN */ 178 /* optional param's follow */ 179 } SCTP_PACKED; 180 181 #define SCTP_IDENTIFICATION_SIZE 16 182 #define SCTP_ADDRESS_SIZE 4 183 #define SCTP_RESERVE_SPACE 6 184 /* state cookie header */ 185 struct sctp_state_cookie { /* this is our definition... */ 186 uint8_t identification[SCTP_IDENTIFICATION_SIZE]; /* id of who we are */ 187 struct timeval time_entered; /* the time I built cookie */ 188 uint32_t cookie_life; /* life I will award this cookie */ 189 uint32_t tie_tag_my_vtag; /* my tag in old association */ 190 191 uint32_t tie_tag_peer_vtag; /* peers tag in old association */ 192 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */ 193 194 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */ 195 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */ 196 uint32_t addr_type; /* address type */ 197 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */ 198 uint32_t laddr_type; /* my local from address type */ 199 uint32_t scope_id; /* v6 scope id for link-locals */ 200 201 uint16_t peerport; /* port address of the peer in the INIT */ 202 uint16_t myport; /* my port address used in the INIT */ 203 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */ 204 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */ 205 uint8_t local_scope; /* IPv6 local scope flag */ 206 uint8_t site_scope; /* IPv6 site scope flag */ 207 208 uint8_t ipv4_scope; /* IPv4 private addr scope */ 209 uint8_t loopback_scope; /* loopback scope information */ 210 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */ 211 /* 212 * at the end is tacked on the INIT chunk and the INIT-ACK chunk 213 * (minus the cookie). 214 */ 215 } SCTP_PACKED; 216 217 218 /* Used for NAT state error cause */ 219 struct sctp_missing_nat_state { 220 uint16_t cause; 221 uint16_t length; 222 uint8_t data[]; 223 } SCTP_PACKED; 224 225 226 struct sctp_inv_mandatory_param { 227 uint16_t cause; 228 uint16_t length; 229 uint32_t num_param; 230 uint16_t param; 231 /* 232 * We include this to 0 it since only a missing cookie will cause 233 * this error. 234 */ 235 uint16_t resv; 236 } SCTP_PACKED; 237 238 struct sctp_unresolv_addr { 239 uint16_t cause; 240 uint16_t length; 241 uint16_t addr_type; 242 uint16_t reserved; /* Only one invalid addr type */ 243 } SCTP_PACKED; 244 245 /* state cookie parameter */ 246 struct sctp_state_cookie_param { 247 struct sctp_paramhdr ph; 248 struct sctp_state_cookie cookie; 249 } SCTP_PACKED; 250 251 struct sctp_init_chunk { 252 struct sctp_chunkhdr ch; 253 struct sctp_init init; 254 } SCTP_PACKED; 255 256 struct sctp_init_msg { 257 struct sctphdr sh; 258 struct sctp_init_chunk msg; 259 } SCTP_PACKED; 260 261 /* ... used for both INIT and INIT ACK */ 262 #define sctp_init_ack sctp_init 263 #define sctp_init_ack_chunk sctp_init_chunk 264 #define sctp_init_ack_msg sctp_init_msg 265 266 267 /* Selective Ack (SACK) */ 268 struct sctp_gap_ack_block { 269 uint16_t start; /* Gap Ack block start */ 270 uint16_t end; /* Gap Ack block end */ 271 } SCTP_PACKED; 272 273 struct sctp_sack { 274 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 275 uint32_t a_rwnd; /* updated a_rwnd of sender */ 276 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 277 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 278 /* struct sctp_gap_ack_block's follow */ 279 /* uint32_t duplicate_tsn's follow */ 280 } SCTP_PACKED; 281 282 struct sctp_sack_chunk { 283 struct sctp_chunkhdr ch; 284 struct sctp_sack sack; 285 } SCTP_PACKED; 286 287 struct sctp_nr_sack { 288 uint32_t cum_tsn_ack; /* cumulative TSN Ack */ 289 uint32_t a_rwnd; /* updated a_rwnd of sender */ 290 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */ 291 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */ 292 uint16_t num_dup_tsns; /* number of duplicate TSNs */ 293 uint16_t reserved; /* not currently used */ 294 /* struct sctp_gap_ack_block's follow */ 295 /* uint32_t duplicate_tsn's follow */ 296 } SCTP_PACKED; 297 298 struct sctp_nr_sack_chunk { 299 struct sctp_chunkhdr ch; 300 struct sctp_nr_sack nr_sack; 301 } SCTP_PACKED; 302 303 304 /* Heartbeat Request (HEARTBEAT) */ 305 struct sctp_heartbeat { 306 struct sctp_heartbeat_info_param hb_info; 307 } SCTP_PACKED; 308 309 struct sctp_heartbeat_chunk { 310 struct sctp_chunkhdr ch; 311 struct sctp_heartbeat heartbeat; 312 } SCTP_PACKED; 313 314 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */ 315 #define sctp_heartbeat_ack sctp_heartbeat 316 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk 317 318 319 /* Abort Asssociation (ABORT) */ 320 struct sctp_abort_chunk { 321 struct sctp_chunkhdr ch; 322 /* optional error cause may follow */ 323 } SCTP_PACKED; 324 325 struct sctp_abort_msg { 326 struct sctphdr sh; 327 struct sctp_abort_chunk msg; 328 } SCTP_PACKED; 329 330 331 /* Shutdown Association (SHUTDOWN) */ 332 struct sctp_shutdown_chunk { 333 struct sctp_chunkhdr ch; 334 uint32_t cumulative_tsn_ack; 335 } SCTP_PACKED; 336 337 338 /* Shutdown Acknowledgment (SHUTDOWN ACK) */ 339 struct sctp_shutdown_ack_chunk { 340 struct sctp_chunkhdr ch; 341 } SCTP_PACKED; 342 343 344 /* Operation Error (ERROR) */ 345 struct sctp_error_chunk { 346 struct sctp_chunkhdr ch; 347 /* optional error causes follow */ 348 } SCTP_PACKED; 349 350 351 /* Cookie Echo (COOKIE ECHO) */ 352 struct sctp_cookie_echo_chunk { 353 struct sctp_chunkhdr ch; 354 struct sctp_state_cookie cookie; 355 } SCTP_PACKED; 356 357 /* Cookie Acknowledgment (COOKIE ACK) */ 358 struct sctp_cookie_ack_chunk { 359 struct sctp_chunkhdr ch; 360 } SCTP_PACKED; 361 362 /* Explicit Congestion Notification Echo (ECNE) */ 363 struct sctp_ecne_chunk { 364 struct sctp_chunkhdr ch; 365 uint32_t tsn; 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_NOTHING 0x00000000 /* Nothing for me to do */ 501 #define SCTP_STREAM_RESET_PERFORMED 0x00000001 /* Did it */ 502 #define SCTP_STREAM_RESET_DENIED 0x00000002 /* refused to do it */ 503 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003 /* bad Stream no */ 504 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004 /* collision, try again */ 505 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005 /* bad str-reset seq no */ 506 507 /* 508 * convience structures, note that if you are making a request for specific 509 * streams then the request will need to be an overlay structure. 510 */ 511 512 struct sctp_stream_reset_out_req { 513 struct sctp_chunkhdr ch; 514 struct sctp_stream_reset_out_request sr_req; 515 } SCTP_PACKED; 516 517 struct sctp_stream_reset_in_req { 518 struct sctp_chunkhdr ch; 519 struct sctp_stream_reset_in_request sr_req; 520 } SCTP_PACKED; 521 522 struct sctp_stream_reset_tsn_req { 523 struct sctp_chunkhdr ch; 524 struct sctp_stream_reset_tsn_request sr_req; 525 } SCTP_PACKED; 526 527 struct sctp_stream_reset_resp { 528 struct sctp_chunkhdr ch; 529 struct sctp_stream_reset_response sr_resp; 530 } SCTP_PACKED; 531 532 /* respone only valid with a TSN request */ 533 struct sctp_stream_reset_resp_tsn { 534 struct sctp_chunkhdr ch; 535 struct sctp_stream_reset_response_tsn sr_resp; 536 } SCTP_PACKED; 537 538 /****************************************************/ 539 540 /* 541 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth 542 */ 543 544 /* Should we make the max be 32? */ 545 #define SCTP_RANDOM_MAX_SIZE 256 546 struct sctp_auth_random { 547 struct sctp_paramhdr ph;/* type = 0x8002 */ 548 uint8_t random_data[]; 549 } SCTP_PACKED; 550 551 struct sctp_auth_chunk_list { 552 struct sctp_paramhdr ph;/* type = 0x8003 */ 553 uint8_t chunk_types[]; 554 } SCTP_PACKED; 555 556 struct sctp_auth_hmac_algo { 557 struct sctp_paramhdr ph;/* type = 0x8004 */ 558 uint16_t hmac_ids[]; 559 } SCTP_PACKED; 560 561 struct sctp_auth_chunk { 562 struct sctp_chunkhdr ch; 563 uint16_t shared_key_id; 564 uint16_t hmac_id; 565 uint8_t hmac[]; 566 } SCTP_PACKED; 567 568 struct sctp_auth_invalid_hmac { 569 struct sctp_paramhdr ph; 570 uint16_t hmac_id; 571 uint16_t padding; 572 } SCTP_PACKED; 573 574 /* 575 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing 576 * pieces. If ENCE is missing we could have a couple of blocks. This way we 577 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size 578 * data chunk I will split into. We could increase throughput slightly by 579 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I 580 * feel is worth it for now. 581 */ 582 #ifndef SCTP_MAX_OVERHEAD 583 #ifdef INET6 584 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 585 sizeof(struct sctphdr) + \ 586 sizeof(struct sctp_ecne_chunk) + \ 587 sizeof(struct sctp_sack_chunk) + \ 588 sizeof(struct ip6_hdr)) 589 590 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 591 sizeof(struct sctphdr) + \ 592 sizeof(struct ip6_hdr)) 593 594 595 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \ 596 sizeof(struct sctphdr)) 597 598 #else 599 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 600 sizeof(struct sctphdr) + \ 601 sizeof(struct sctp_ecne_chunk) + \ 602 sizeof(struct sctp_sack_chunk) + \ 603 sizeof(struct ip)) 604 605 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 606 sizeof(struct sctphdr) + \ 607 sizeof(struct ip)) 608 609 610 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \ 611 sizeof(struct sctphdr)) 612 613 #endif /* INET6 */ 614 #endif /* !SCTP_MAX_OVERHEAD */ 615 616 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \ 617 sizeof(struct sctphdr) + \ 618 sizeof(struct ip)) 619 620 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \ 621 sizeof(struct sctphdr)) 622 623 #undef SCTP_PACKED 624 #endif /* !__sctp_header_h__ */ 625