The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_header.h

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    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 
   44 /*
   45  * Parameter structures
   46  */
   47 struct sctp_ipv4addr_param {
   48         struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */
   49         uint32_t addr;          /* IPV4 address */
   50 }                   SCTP_PACKED;
   51 
   52 #define SCTP_V6_ADDR_BYTES 16
   53 
   54 
   55 struct sctp_ipv6addr_param {
   56         struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */
   57         uint8_t addr[SCTP_V6_ADDR_BYTES];       /* IPV6 address */
   58 }                   SCTP_PACKED;
   59 
   60 /* Cookie Preservative */
   61 struct sctp_cookie_perserve_param {
   62         struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */
   63         uint32_t time;          /* time in ms to extend cookie */
   64 };
   65 
   66 #define SCTP_ARRAY_MIN_LEN 1
   67 /* Host Name Address */
   68 struct sctp_host_name_param {
   69         struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */
   70         char name[SCTP_ARRAY_MIN_LEN];  /* host name */
   71 }                    SCTP_PACKED;
   72 
   73 /*
   74  * This is the maximum padded size of a s-a-p
   75  * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12
   76  */
   77 #define SCTP_MAX_ADDR_PARAMS_SIZE 12
   78 /* supported address type */
   79 struct sctp_supported_addr_param {
   80         struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */
   81         uint16_t addr_type[SCTP_ARRAY_MIN_LEN]; /* array of supported address
   82                                                  * 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         uint16_t user_req;
   99         uint8_t addr_family;
  100         uint8_t addr_len;
  101         char address[SCTP_ADDRMAX];
  102 }                         SCTP_PACKED;
  103 
  104 
  105 /* draft-ietf-tsvwg-prsctp */
  106 /* PR-SCTP supported parameter */
  107 struct sctp_prsctp_supported_param {
  108         struct sctp_paramhdr ph;
  109 }                           SCTP_PACKED;
  110 
  111 
  112 /* draft-ietf-tsvwg-addip-sctp */
  113 struct sctp_asconf_paramhdr {   /* an ASCONF "parameter" */
  114         struct sctp_paramhdr ph;/* a SCTP parameter header */
  115         uint32_t correlation_id;/* correlation id for this param */
  116 }                    SCTP_PACKED;
  117 
  118 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
  119         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  120         struct sctp_ipv6addr_param addrp;       /* max storage size */
  121 }                      SCTP_PACKED;
  122 
  123 struct sctp_asconf_addrv4_param {       /* an ASCONF address (v4) parameter */
  124         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  125         struct sctp_ipv4addr_param addrp;       /* max storage size */
  126 }                        SCTP_PACKED;
  127 
  128 #define SCTP_MAX_SUPPORTED_EXT 256
  129 
  130 struct sctp_supported_chunk_types_param {
  131         struct sctp_paramhdr ph;/* type = 0x8008  len = x */
  132         uint8_t chunk_types[0];
  133 }                                SCTP_PACKED;
  134 
  135 
  136 /* ECN Nonce: draft-ladha-sctp-ecn-nonce */
  137 struct sctp_ecn_nonce_supported_param {
  138         struct sctp_paramhdr ph;/* type = 0x8001  len = 4 */
  139 }                              SCTP_PACKED;
  140 
  141 
  142 /*
  143  * Structures for DATA chunks
  144  */
  145 struct sctp_data {
  146         uint32_t tsn;
  147         uint16_t stream_id;
  148         uint16_t stream_sequence;
  149         uint32_t protocol_id;
  150         /* user data follows */
  151 }         SCTP_PACKED;
  152 
  153 struct sctp_data_chunk {
  154         struct sctp_chunkhdr ch;
  155         struct sctp_data dp;
  156 }               SCTP_PACKED;
  157 
  158 /*
  159  * Structures for the control chunks
  160  */
  161 
  162 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  163 struct sctp_init {
  164         uint32_t initiate_tag;  /* initiate tag */
  165         uint32_t a_rwnd;        /* a_rwnd */
  166         uint16_t num_outbound_streams;  /* OS */
  167         uint16_t num_inbound_streams;   /* MIS */
  168         uint32_t initial_tsn;   /* I-TSN */
  169         /* optional param's follow */
  170 }         SCTP_PACKED;
  171 
  172 #define SCTP_IDENTIFICATION_SIZE 16
  173 #define SCTP_ADDRESS_SIZE 4
  174 #define SCTP_RESERVE_SPACE 6
  175 /* state cookie header */
  176 struct sctp_state_cookie {      /* this is our definition... */
  177         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  178         struct timeval time_entered;    /* the time I built cookie */
  179         uint32_t cookie_life;   /* life I will award this cookie */
  180         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  181 
  182         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  183         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  184 
  185         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  186         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  187         uint32_t addr_type;     /* address type */
  188         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  189         uint32_t laddr_type;    /* my local from address type */
  190         uint32_t scope_id;      /* v6 scope id for link-locals */
  191 
  192         uint16_t peerport;      /* port address of the peer in the INIT */
  193         uint16_t myport;        /* my port address used in the INIT */
  194         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  195         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  196         uint8_t local_scope;    /* IPv6 local scope flag */
  197         uint8_t site_scope;     /* IPv6 site scope flag */
  198 
  199         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  200         uint8_t loopback_scope; /* loopback scope information */
  201         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  202         /*
  203          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  204          * (minus the cookie).
  205          */
  206 }                 SCTP_PACKED;
  207 
  208 struct sctp_inv_mandatory_param {
  209         uint16_t cause;
  210         uint16_t length;
  211         uint32_t num_param;
  212         uint16_t param;
  213         /*
  214          * We include this to 0 it since only a missing cookie will cause
  215          * this error.
  216          */
  217         uint16_t resv;
  218 }                        SCTP_PACKED;
  219 
  220 struct sctp_unresolv_addr {
  221         uint16_t cause;
  222         uint16_t length;
  223         uint16_t addr_type;
  224         uint16_t reserved;      /* Only one invalid addr type */
  225 }                  SCTP_PACKED;
  226 
  227 /* state cookie parameter */
  228 struct sctp_state_cookie_param {
  229         struct sctp_paramhdr ph;
  230         struct sctp_state_cookie cookie;
  231 }                       SCTP_PACKED;
  232 
  233 struct sctp_init_chunk {
  234         struct sctp_chunkhdr ch;
  235         struct sctp_init init;
  236 }               SCTP_PACKED;
  237 
  238 struct sctp_init_msg {
  239         struct sctphdr sh;
  240         struct sctp_init_chunk msg;
  241 }             SCTP_PACKED;
  242 
  243 /* ... used for both INIT and INIT ACK */
  244 #define sctp_init_ack           sctp_init
  245 #define sctp_init_ack_chunk     sctp_init_chunk
  246 #define sctp_init_ack_msg       sctp_init_msg
  247 
  248 
  249 /* Selective Ack (SACK) */
  250 struct sctp_gap_ack_block {
  251         uint16_t start;         /* Gap Ack block start */
  252         uint16_t end;           /* Gap Ack block end */
  253 }                  SCTP_PACKED;
  254 
  255 struct sctp_sack {
  256         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  257         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  258         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  259         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  260         /* struct sctp_gap_ack_block's follow */
  261         /* uint32_t duplicate_tsn's follow */
  262 }         SCTP_PACKED;
  263 
  264 struct sctp_sack_chunk {
  265         struct sctp_chunkhdr ch;
  266         struct sctp_sack sack;
  267 }               SCTP_PACKED;
  268 
  269 
  270 /* Heartbeat Request (HEARTBEAT) */
  271 struct sctp_heartbeat {
  272         struct sctp_heartbeat_info_param hb_info;
  273 }              SCTP_PACKED;
  274 
  275 struct sctp_heartbeat_chunk {
  276         struct sctp_chunkhdr ch;
  277         struct sctp_heartbeat heartbeat;
  278 }                    SCTP_PACKED;
  279 
  280 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  281 #define sctp_heartbeat_ack              sctp_heartbeat
  282 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  283 
  284 
  285 /* Abort Asssociation (ABORT) */
  286 struct sctp_abort_chunk {
  287         struct sctp_chunkhdr ch;
  288         /* optional error cause may follow */
  289 }                SCTP_PACKED;
  290 
  291 struct sctp_abort_msg {
  292         struct sctphdr sh;
  293         struct sctp_abort_chunk msg;
  294 }              SCTP_PACKED;
  295 
  296 
  297 /* Shutdown Association (SHUTDOWN) */
  298 struct sctp_shutdown_chunk {
  299         struct sctp_chunkhdr ch;
  300         uint32_t cumulative_tsn_ack;
  301 }                   SCTP_PACKED;
  302 
  303 
  304 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  305 struct sctp_shutdown_ack_chunk {
  306         struct sctp_chunkhdr ch;
  307 }                       SCTP_PACKED;
  308 
  309 
  310 /* Operation Error (ERROR) */
  311 struct sctp_error_chunk {
  312         struct sctp_chunkhdr ch;
  313         /* optional error causes follow */
  314 }                SCTP_PACKED;
  315 
  316 
  317 /* Cookie Echo (COOKIE ECHO) */
  318 struct sctp_cookie_echo_chunk {
  319         struct sctp_chunkhdr ch;
  320         struct sctp_state_cookie cookie;
  321 }                      SCTP_PACKED;
  322 
  323 /* Cookie Acknowledgment (COOKIE ACK) */
  324 struct sctp_cookie_ack_chunk {
  325         struct sctp_chunkhdr ch;
  326 }                     SCTP_PACKED;
  327 
  328 /* Explicit Congestion Notification Echo (ECNE) */
  329 struct sctp_ecne_chunk {
  330         struct sctp_chunkhdr ch;
  331         uint32_t tsn;
  332 }               SCTP_PACKED;
  333 
  334 /* Congestion Window Reduced (CWR) */
  335 struct sctp_cwr_chunk {
  336         struct sctp_chunkhdr ch;
  337         uint32_t tsn;
  338 }              SCTP_PACKED;
  339 
  340 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  341 struct sctp_shutdown_complete_chunk {
  342         struct sctp_chunkhdr ch;
  343 }                            SCTP_PACKED;
  344 
  345 /* Oper error holding a stale cookie */
  346 struct sctp_stale_cookie_msg {
  347         struct sctp_paramhdr ph;/* really an error cause */
  348         uint32_t time_usec;
  349 }                     SCTP_PACKED;
  350 
  351 struct sctp_adaptation_layer_indication {
  352         struct sctp_paramhdr ph;
  353         uint32_t indication;
  354 }                                SCTP_PACKED;
  355 
  356 struct sctp_cookie_while_shutting_down {
  357         struct sctphdr sh;
  358         struct sctp_chunkhdr ch;
  359         struct sctp_paramhdr ph;/* really an error cause */
  360 }                               SCTP_PACKED;
  361 
  362 struct sctp_shutdown_complete_msg {
  363         struct sctphdr sh;
  364         struct sctp_shutdown_complete_chunk shut_cmp;
  365 }                          SCTP_PACKED;
  366 
  367 /*
  368  * draft-ietf-tsvwg-addip-sctp
  369  */
  370 /* Address/Stream Configuration Change (ASCONF) */
  371 struct sctp_asconf_chunk {
  372         struct sctp_chunkhdr ch;
  373         uint32_t serial_number;
  374         /* lookup address parameter (mandatory) */
  375         /* asconf parameters follow */
  376 }                 SCTP_PACKED;
  377 
  378 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  379 struct sctp_asconf_ack_chunk {
  380         struct sctp_chunkhdr ch;
  381         uint32_t serial_number;
  382         /* asconf parameters follow */
  383 }                     SCTP_PACKED;
  384 
  385 /* draft-ietf-tsvwg-prsctp */
  386 /* Forward Cumulative TSN (FORWARD TSN) */
  387 struct sctp_forward_tsn_chunk {
  388         struct sctp_chunkhdr ch;
  389         uint32_t new_cumulative_tsn;
  390         /* stream/sequence pairs (sctp_strseq) follow */
  391 }                      SCTP_PACKED;
  392 
  393 struct sctp_strseq {
  394         uint16_t stream;
  395         uint16_t sequence;
  396 }           SCTP_PACKED;
  397 
  398 struct sctp_forward_tsn_msg {
  399         struct sctphdr sh;
  400         struct sctp_forward_tsn_chunk msg;
  401 }                    SCTP_PACKED;
  402 
  403 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  404 
  405 #define SCTP_NUM_DB_TO_VERIFY 31
  406 
  407 struct sctp_chunk_desc {
  408         uint8_t chunk_type;
  409         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  410         uint32_t tsn_ifany;
  411 }               SCTP_PACKED;
  412 
  413 
  414 struct sctp_pktdrop_chunk {
  415         struct sctp_chunkhdr ch;
  416         uint32_t bottle_bw;
  417         uint32_t current_onq;
  418         uint16_t trunc_len;
  419         uint16_t reserved;
  420         uint8_t data[0];
  421 }                  SCTP_PACKED;
  422 
  423 /**********STREAM RESET STUFF ******************/
  424 
  425 struct sctp_stream_reset_out_request {
  426         struct sctp_paramhdr ph;
  427         uint32_t request_seq;   /* monotonically increasing seq no */
  428         uint32_t response_seq;  /* if a response, the resp seq no */
  429         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  430         uint16_t list_of_streams[0];    /* if not all list of streams */
  431 }                             SCTP_PACKED;
  432 
  433 struct sctp_stream_reset_in_request {
  434         struct sctp_paramhdr ph;
  435         uint32_t request_seq;
  436         uint16_t list_of_streams[0];    /* if not all list of streams */
  437 }                            SCTP_PACKED;
  438 
  439 
  440 struct sctp_stream_reset_tsn_request {
  441         struct sctp_paramhdr ph;
  442         uint32_t request_seq;
  443 }                             SCTP_PACKED;
  444 
  445 struct sctp_stream_reset_response {
  446         struct sctp_paramhdr ph;
  447         uint32_t response_seq;  /* if a response, the resp seq no */
  448         uint32_t result;
  449 }                          SCTP_PACKED;
  450 
  451 struct sctp_stream_reset_response_tsn {
  452         struct sctp_paramhdr ph;
  453         uint32_t response_seq;  /* if a response, the resp seq no */
  454         uint32_t result;
  455         uint32_t senders_next_tsn;
  456         uint32_t receivers_next_tsn;
  457 }                              SCTP_PACKED;
  458 
  459 
  460 
  461 #define SCTP_STREAM_RESET_NOTHING   0x00000000  /* Nothing for me to do */
  462 #define SCTP_STREAM_RESET_PERFORMED 0x00000001  /* Did it */
  463 #define SCTP_STREAM_RESET_DENIED    0x00000002  /* refused to do it */
  464 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003  /* bad Stream no */
  465 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004  /* collision, try again */
  466 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005  /* bad str-reset seq no */
  467 
  468 /*
  469  * convience structures, note that if you are making a request for specific
  470  * streams then the request will need to be an overlay structure.
  471  */
  472 
  473 struct sctp_stream_reset_out_req {
  474         struct sctp_chunkhdr ch;
  475         struct sctp_stream_reset_out_request sr_req;
  476 }                         SCTP_PACKED;
  477 
  478 struct sctp_stream_reset_in_req {
  479         struct sctp_chunkhdr ch;
  480         struct sctp_stream_reset_in_request sr_req;
  481 }                        SCTP_PACKED;
  482 
  483 struct sctp_stream_reset_tsn_req {
  484         struct sctp_chunkhdr ch;
  485         struct sctp_stream_reset_tsn_request sr_req;
  486 }                         SCTP_PACKED;
  487 
  488 struct sctp_stream_reset_resp {
  489         struct sctp_chunkhdr ch;
  490         struct sctp_stream_reset_response sr_resp;
  491 }                      SCTP_PACKED;
  492 
  493 /* respone only valid with a TSN request */
  494 struct sctp_stream_reset_resp_tsn {
  495         struct sctp_chunkhdr ch;
  496         struct sctp_stream_reset_response_tsn sr_resp;
  497 }                          SCTP_PACKED;
  498 
  499 /****************************************************/
  500 
  501 /*
  502  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  503  */
  504 
  505 /* Should we make the max be 32? */
  506 #define SCTP_RANDOM_MAX_SIZE 256
  507 struct sctp_auth_random {
  508         struct sctp_paramhdr ph;/* type = 0x8002 */
  509         uint8_t random_data[0];
  510 }                SCTP_PACKED;
  511 
  512 struct sctp_auth_chunk_list {
  513         struct sctp_paramhdr ph;/* type = 0x8003 */
  514         uint8_t chunk_types[0];
  515 }                    SCTP_PACKED;
  516 
  517 struct sctp_auth_hmac_algo {
  518         struct sctp_paramhdr ph;/* type = 0x8004 */
  519         uint16_t hmac_ids[0];
  520 }                   SCTP_PACKED;
  521 
  522 struct sctp_auth_chunk {
  523         struct sctp_chunkhdr ch;
  524         uint16_t shared_key_id;
  525         uint16_t hmac_id;
  526         uint8_t hmac[0];
  527 }               SCTP_PACKED;
  528 
  529 struct sctp_auth_invalid_hmac {
  530         struct sctp_paramhdr ph;
  531         uint16_t hmac_id;
  532         uint16_t padding;
  533 }                      SCTP_PACKED;
  534 
  535 /*
  536  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  537  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  538  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  539  * data chunk I will split into. We could increase throughput slightly by
  540  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  541  * feel is worth it for now.
  542  */
  543 #ifndef SCTP_MAX_OVERHEAD
  544 #ifdef INET6
  545 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  546                            sizeof(struct sctphdr) + \
  547                            sizeof(struct sctp_ecne_chunk) + \
  548                            sizeof(struct sctp_sack_chunk) + \
  549                            sizeof(struct ip6_hdr))
  550 
  551 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  552                            sizeof(struct sctphdr) + \
  553                            sizeof(struct ip6_hdr))
  554 
  555 
  556 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  557                            sizeof(struct sctphdr))
  558 
  559 #else
  560 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  561                            sizeof(struct sctphdr) + \
  562                            sizeof(struct sctp_ecne_chunk) + \
  563                            sizeof(struct sctp_sack_chunk) + \
  564                            sizeof(struct ip))
  565 
  566 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  567                            sizeof(struct sctphdr) + \
  568                            sizeof(struct ip))
  569 
  570 
  571 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  572                            sizeof(struct sctphdr))
  573 
  574 #endif                          /* INET6 */
  575 #endif                          /* !SCTP_MAX_OVERHEAD */
  576 
  577 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  578                               sizeof(struct sctphdr) + \
  579                               sizeof(struct ip))
  580 
  581 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  582                               sizeof(struct sctphdr))
  583 
  584 #endif                          /* !__sctp_header_h__ */

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