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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #ifndef _NETINET_SCTP_HEADER_H_
   39 #define _NETINET_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[2];  /* array of supported address types */
   85 }                         SCTP_PACKED;
   86 
   87 /* heartbeat info parameter */
   88 struct sctp_heartbeat_info_param {
   89         struct sctp_paramhdr ph;
   90         uint32_t time_value_1;
   91         uint32_t time_value_2;
   92         uint32_t random_value1;
   93         uint32_t random_value2;
   94         uint8_t addr_family;
   95         uint8_t addr_len;
   96         /* make sure that this structure is 4 byte aligned */
   97         uint8_t padding[2];
   98         char address[SCTP_ADDRMAX];
   99 }                         SCTP_PACKED;
  100 
  101 
  102 /* draft-ietf-tsvwg-prsctp */
  103 /* PR-SCTP supported parameter */
  104 struct sctp_prsctp_supported_param {
  105         struct sctp_paramhdr ph;
  106 }                           SCTP_PACKED;
  107 
  108 
  109 /* draft-ietf-tsvwg-addip-sctp */
  110 struct sctp_asconf_paramhdr {   /* an ASCONF "parameter" */
  111         struct sctp_paramhdr ph;        /* a SCTP parameter header */
  112         uint32_t correlation_id;        /* correlation id for this param */
  113 }                    SCTP_PACKED;
  114 
  115 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
  116         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  117         struct sctp_ipv6addr_param addrp;       /* max storage size */
  118 }                      SCTP_PACKED;
  119 
  120 
  121 struct sctp_asconf_tag_param {  /* an ASCONF NAT-Vtag parameter */
  122         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  123         uint32_t local_vtag;
  124         uint32_t remote_vtag;
  125 }                     SCTP_PACKED;
  126 
  127 
  128 struct sctp_asconf_addrv4_param {       /* an ASCONF address (v4) parameter */
  129         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  130         struct sctp_ipv4addr_param addrp;       /* max storage size */
  131 }                        SCTP_PACKED;
  132 
  133 #define SCTP_MAX_SUPPORTED_EXT 256
  134 
  135 struct sctp_supported_chunk_types_param {
  136         struct sctp_paramhdr ph;        /* type = 0x8008  len = x */
  137         uint8_t chunk_types[];
  138 }                                SCTP_PACKED;
  139 
  140 
  141 /*
  142  * Structures for DATA chunks
  143  */
  144 struct sctp_data {
  145         uint32_t tsn;
  146         uint16_t sid;
  147         uint16_t ssn;
  148         uint32_t ppid;
  149         /* user data follows */
  150 }         SCTP_PACKED;
  151 
  152 struct sctp_data_chunk {
  153         struct sctp_chunkhdr ch;
  154         struct sctp_data dp;
  155 }               SCTP_PACKED;
  156 
  157 struct sctp_idata {
  158         uint32_t tsn;
  159         uint16_t sid;
  160         uint16_t reserved;      /* Where does the SSN go? */
  161         uint32_t mid;
  162         union {
  163                 uint32_t ppid;
  164                 uint32_t fsn;   /* Fragment Sequence Number */
  165         }     ppid_fsn;
  166         /* user data follows */
  167 }          SCTP_PACKED;
  168 
  169 struct sctp_idata_chunk {
  170         struct sctp_chunkhdr ch;
  171         struct sctp_idata dp;
  172 }                SCTP_PACKED;
  173 
  174 /*
  175  * Structures for the control chunks
  176  */
  177 
  178 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  179 struct sctp_init {
  180         uint32_t initiate_tag;  /* initiate tag */
  181         uint32_t a_rwnd;        /* a_rwnd */
  182         uint16_t num_outbound_streams;  /* OS */
  183         uint16_t num_inbound_streams;   /* MIS */
  184         uint32_t initial_tsn;   /* I-TSN */
  185         /* optional param's follow */
  186 }         SCTP_PACKED;
  187 #define SCTP_IDENTIFICATION_SIZE 16
  188 #define SCTP_ADDRESS_SIZE 4
  189 #define SCTP_RESERVE_SPACE 6
  190 /* state cookie header */
  191 struct sctp_state_cookie {      /* this is our definition... */
  192         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  193         struct timeval time_entered;    /* the time I built cookie */
  194         uint32_t cookie_life;   /* life I will award this cookie */
  195         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  196 
  197         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  198         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  199 
  200         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  201         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  202         uint32_t addr_type;     /* address type */
  203         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  204         uint32_t laddr_type;    /* my local from address type */
  205         uint32_t scope_id;      /* v6 scope id for link-locals */
  206 
  207         uint16_t peerport;      /* port address of the peer in the INIT */
  208         uint16_t myport;        /* my port address used in the INIT */
  209         uint8_t ipv4_addr_legal;        /* Are V4 addr legal? */
  210         uint8_t ipv6_addr_legal;        /* Are V6 addr legal? */
  211         uint8_t local_scope;    /* IPv6 local scope flag */
  212         uint8_t site_scope;     /* IPv6 site scope flag */
  213 
  214         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  215         uint8_t loopback_scope; /* loopback scope information */
  216         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  217         /*
  218          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  219          * (minus the cookie).
  220          */
  221 }                 SCTP_PACKED;
  222 
  223 /* state cookie parameter */
  224 struct sctp_state_cookie_param {
  225         struct sctp_paramhdr ph;
  226         struct sctp_state_cookie cookie;
  227 }                       SCTP_PACKED;
  228 
  229 struct sctp_init_chunk {
  230         struct sctp_chunkhdr ch;
  231         struct sctp_init init;
  232 }               SCTP_PACKED;
  233 
  234 struct sctp_init_msg {
  235         struct sctphdr sh;
  236         struct sctp_init_chunk msg;
  237 }             SCTP_PACKED;
  238 
  239 /* ... used for both INIT and INIT ACK */
  240 #define sctp_init_ack           sctp_init
  241 #define sctp_init_ack_chunk     sctp_init_chunk
  242 #define sctp_init_ack_msg       sctp_init_msg
  243 
  244 
  245 /* Selective Ack (SACK) */
  246 struct sctp_gap_ack_block {
  247         uint16_t start;         /* Gap Ack block start */
  248         uint16_t end;           /* Gap Ack block end */
  249 }                  SCTP_PACKED;
  250 
  251 struct sctp_sack {
  252         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  253         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  254         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  255         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  256         /* struct sctp_gap_ack_block's follow */
  257         /* uint32_t duplicate_tsn's follow */
  258 }         SCTP_PACKED;
  259 
  260 struct sctp_sack_chunk {
  261         struct sctp_chunkhdr ch;
  262         struct sctp_sack sack;
  263 }               SCTP_PACKED;
  264 
  265 struct sctp_nr_sack {
  266         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  267         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  268         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  269         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  270         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  271         uint16_t reserved;      /* not currently used */
  272         /* struct sctp_gap_ack_block's follow */
  273         /* uint32_t duplicate_tsn's follow */
  274 }            SCTP_PACKED;
  275 
  276 struct sctp_nr_sack_chunk {
  277         struct sctp_chunkhdr ch;
  278         struct sctp_nr_sack nr_sack;
  279 }                  SCTP_PACKED;
  280 
  281 
  282 /* Heartbeat Request (HEARTBEAT) */
  283 struct sctp_heartbeat {
  284         struct sctp_heartbeat_info_param hb_info;
  285 }              SCTP_PACKED;
  286 
  287 struct sctp_heartbeat_chunk {
  288         struct sctp_chunkhdr ch;
  289         struct sctp_heartbeat heartbeat;
  290 }                    SCTP_PACKED;
  291 
  292 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  293 #define sctp_heartbeat_ack              sctp_heartbeat
  294 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  295 
  296 
  297 /* Abort Asssociation (ABORT) */
  298 struct sctp_abort_chunk {
  299         struct sctp_chunkhdr ch;
  300         /* optional error cause may follow */
  301 }                SCTP_PACKED;
  302 
  303 struct sctp_abort_msg {
  304         struct sctphdr sh;
  305         struct sctp_abort_chunk msg;
  306 }              SCTP_PACKED;
  307 
  308 
  309 /* Shutdown Association (SHUTDOWN) */
  310 struct sctp_shutdown_chunk {
  311         struct sctp_chunkhdr ch;
  312         uint32_t cumulative_tsn_ack;
  313 }                   SCTP_PACKED;
  314 
  315 
  316 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  317 struct sctp_shutdown_ack_chunk {
  318         struct sctp_chunkhdr ch;
  319 }                       SCTP_PACKED;
  320 
  321 
  322 /* Operation Error (ERROR) */
  323 struct sctp_error_chunk {
  324         struct sctp_chunkhdr ch;
  325         /* optional error causes follow */
  326 }                SCTP_PACKED;
  327 
  328 
  329 /* Cookie Echo (COOKIE ECHO) */
  330 struct sctp_cookie_echo_chunk {
  331         struct sctp_chunkhdr ch;
  332         struct sctp_state_cookie cookie;
  333 }                      SCTP_PACKED;
  334 
  335 /* Cookie Acknowledgment (COOKIE ACK) */
  336 struct sctp_cookie_ack_chunk {
  337         struct sctp_chunkhdr ch;
  338 }                     SCTP_PACKED;
  339 
  340 /* Explicit Congestion Notification Echo (ECNE) */
  341 struct old_sctp_ecne_chunk {
  342         struct sctp_chunkhdr ch;
  343         uint32_t tsn;
  344 }                   SCTP_PACKED;
  345 
  346 struct sctp_ecne_chunk {
  347         struct sctp_chunkhdr ch;
  348         uint32_t tsn;
  349         uint32_t num_pkts_since_cwr;
  350 }               SCTP_PACKED;
  351 
  352 /* Congestion Window Reduced (CWR) */
  353 struct sctp_cwr_chunk {
  354         struct sctp_chunkhdr ch;
  355         uint32_t tsn;
  356 }              SCTP_PACKED;
  357 
  358 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  359 struct sctp_shutdown_complete_chunk {
  360         struct sctp_chunkhdr ch;
  361 }                            SCTP_PACKED;
  362 
  363 struct sctp_adaptation_layer_indication {
  364         struct sctp_paramhdr ph;
  365         uint32_t indication;
  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 sid;
  396         uint16_t ssn;
  397 }           SCTP_PACKED;
  398 
  399 struct sctp_strseq_mid {
  400         uint16_t sid;
  401         uint16_t flags;
  402         uint32_t mid;
  403 };
  404 
  405 struct sctp_forward_tsn_msg {
  406         struct sctphdr sh;
  407         struct sctp_forward_tsn_chunk msg;
  408 }                    SCTP_PACKED;
  409 
  410 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  411 
  412 #define SCTP_NUM_DB_TO_VERIFY 31
  413 
  414 struct sctp_chunk_desc {
  415         uint8_t chunk_type;
  416         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  417         uint32_t tsn_ifany;
  418 }               SCTP_PACKED;
  419 
  420 
  421 struct sctp_pktdrop_chunk {
  422         struct sctp_chunkhdr ch;
  423         uint32_t bottle_bw;
  424         uint32_t current_onq;
  425         uint16_t trunc_len;
  426         uint16_t reserved;
  427         uint8_t data[];
  428 }                  SCTP_PACKED;
  429 
  430 /**********STREAM RESET STUFF ******************/
  431 
  432 struct sctp_stream_reset_request {
  433         struct sctp_paramhdr ph;
  434         uint32_t request_seq;
  435 }                         SCTP_PACKED;
  436 
  437 struct sctp_stream_reset_out_request {
  438         struct sctp_paramhdr ph;
  439         uint32_t request_seq;   /* monotonically increasing seq no */
  440         uint32_t response_seq;  /* if a response, the resp seq no */
  441         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  442         uint16_t list_of_streams[];     /* if not all list of streams */
  443 }                             SCTP_PACKED;
  444 
  445 struct sctp_stream_reset_in_request {
  446         struct sctp_paramhdr ph;
  447         uint32_t request_seq;
  448         uint16_t list_of_streams[];     /* if not all list of streams */
  449 }                            SCTP_PACKED;
  450 
  451 struct sctp_stream_reset_tsn_request {
  452         struct sctp_paramhdr ph;
  453         uint32_t request_seq;
  454 }                             SCTP_PACKED;
  455 
  456 struct sctp_stream_reset_response {
  457         struct sctp_paramhdr ph;
  458         uint32_t response_seq;  /* if a response, the resp seq no */
  459         uint32_t result;
  460 }                          SCTP_PACKED;
  461 
  462 struct sctp_stream_reset_response_tsn {
  463         struct sctp_paramhdr ph;
  464         uint32_t response_seq;  /* if a response, the resp seq no */
  465         uint32_t result;
  466         uint32_t senders_next_tsn;
  467         uint32_t receivers_next_tsn;
  468 }                              SCTP_PACKED;
  469 
  470 struct sctp_stream_reset_add_strm {
  471         struct sctp_paramhdr ph;
  472         uint32_t request_seq;
  473         uint16_t number_of_streams;
  474         uint16_t reserved;
  475 }                          SCTP_PACKED;
  476 
  477 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO   0x00000000     /* XXX: unused */
  478 #define SCTP_STREAM_RESET_RESULT_PERFORMED       0x00000001
  479 #define SCTP_STREAM_RESET_RESULT_DENIED          0x00000002
  480 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN  0x00000003     /* XXX: unused */
  481 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
  482 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO   0x00000005
  483 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS     0x00000006     /* XXX: unused */
  484 
  485 /*
  486  * convience structures, note that if you are making a request for specific
  487  * streams then the request will need to be an overlay structure.
  488  */
  489 
  490 struct sctp_stream_reset_tsn_req {
  491         struct sctp_chunkhdr ch;
  492         struct sctp_stream_reset_tsn_request sr_req;
  493 }                         SCTP_PACKED;
  494 
  495 struct sctp_stream_reset_resp {
  496         struct sctp_chunkhdr ch;
  497         struct sctp_stream_reset_response sr_resp;
  498 }                      SCTP_PACKED;
  499 
  500 /* respone only valid with a TSN request */
  501 struct sctp_stream_reset_resp_tsn {
  502         struct sctp_chunkhdr ch;
  503         struct sctp_stream_reset_response_tsn sr_resp;
  504 }                          SCTP_PACKED;
  505 
  506 /****************************************************/
  507 
  508 /*
  509  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  510  */
  511 
  512 /* Should we make the max be 32? */
  513 #define SCTP_RANDOM_MAX_SIZE 256
  514 struct sctp_auth_random {
  515         struct sctp_paramhdr ph;        /* type = 0x8002 */
  516         uint8_t random_data[];
  517 }                SCTP_PACKED;
  518 
  519 struct sctp_auth_chunk_list {
  520         struct sctp_paramhdr ph;        /* type = 0x8003 */
  521         uint8_t chunk_types[];
  522 }                    SCTP_PACKED;
  523 
  524 struct sctp_auth_hmac_algo {
  525         struct sctp_paramhdr ph;        /* type = 0x8004 */
  526         uint16_t hmac_ids[];
  527 }                   SCTP_PACKED;
  528 
  529 struct sctp_auth_chunk {
  530         struct sctp_chunkhdr ch;
  531         uint16_t shared_key_id;
  532         uint16_t hmac_id;
  533         uint8_t hmac[];
  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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