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

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