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

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