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: releng/7.4/sys/netinet/sctp_header.h 188532 2009-02-12 18:50:27Z rrs $");
   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 
  125 struct sctp_asconf_tag_param {  /* an ASCONF NAT-Vtag parameter */
  126         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  127         uint32_t local_vtag;
  128         uint32_t remote_vtag;
  129 }                     SCTP_PACKED;
  130 
  131 
  132 struct sctp_asconf_addrv4_param {       /* an ASCONF address (v4) parameter */
  133         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  134         struct sctp_ipv4addr_param addrp;       /* max storage size */
  135 }                        SCTP_PACKED;
  136 
  137 #define SCTP_MAX_SUPPORTED_EXT 256
  138 
  139 struct sctp_supported_chunk_types_param {
  140         struct sctp_paramhdr ph;/* type = 0x8008  len = x */
  141         uint8_t chunk_types[0];
  142 }                                SCTP_PACKED;
  143 
  144 
  145 /* ECN Nonce: draft-ladha-sctp-ecn-nonce */
  146 struct sctp_ecn_nonce_supported_param {
  147         struct sctp_paramhdr ph;/* type = 0x8001  len = 4 */
  148 }                              SCTP_PACKED;
  149 
  150 
  151 /*
  152  * Structures for DATA chunks
  153  */
  154 struct sctp_data {
  155         uint32_t tsn;
  156         uint16_t stream_id;
  157         uint16_t stream_sequence;
  158         uint32_t protocol_id;
  159         /* user data follows */
  160 }         SCTP_PACKED;
  161 
  162 struct sctp_data_chunk {
  163         struct sctp_chunkhdr ch;
  164         struct sctp_data dp;
  165 }               SCTP_PACKED;
  166 
  167 /*
  168  * Structures for the control chunks
  169  */
  170 
  171 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  172 struct sctp_init {
  173         uint32_t initiate_tag;  /* initiate tag */
  174         uint32_t a_rwnd;        /* a_rwnd */
  175         uint16_t num_outbound_streams;  /* OS */
  176         uint16_t num_inbound_streams;   /* MIS */
  177         uint32_t initial_tsn;   /* I-TSN */
  178         /* optional param's follow */
  179 }         SCTP_PACKED;
  180 
  181 #define SCTP_IDENTIFICATION_SIZE 16
  182 #define SCTP_ADDRESS_SIZE 4
  183 #define SCTP_RESERVE_SPACE 6
  184 /* state cookie header */
  185 struct sctp_state_cookie {      /* this is our definition... */
  186         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  187         struct timeval time_entered;    /* the time I built cookie */
  188         uint32_t cookie_life;   /* life I will award this cookie */
  189         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  190 
  191         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  192         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  193 
  194         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  195         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  196         uint32_t addr_type;     /* address type */
  197         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  198         uint32_t laddr_type;    /* my local from address type */
  199         uint32_t scope_id;      /* v6 scope id for link-locals */
  200 
  201         uint16_t peerport;      /* port address of the peer in the INIT */
  202         uint16_t myport;        /* my port address used in the INIT */
  203         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  204         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  205         uint8_t local_scope;    /* IPv6 local scope flag */
  206         uint8_t site_scope;     /* IPv6 site scope flag */
  207 
  208         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  209         uint8_t loopback_scope; /* loopback scope information */
  210         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  211         /*
  212          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  213          * (minus the cookie).
  214          */
  215 }                 SCTP_PACKED;
  216 
  217 
  218 /* Used for NAT state error cause */
  219 struct sctp_missing_nat_state {
  220         uint16_t cause;
  221         uint16_t length;
  222         uint8_t data[0];
  223 }                      SCTP_PACKED;
  224 
  225 
  226 struct sctp_inv_mandatory_param {
  227         uint16_t cause;
  228         uint16_t length;
  229         uint32_t num_param;
  230         uint16_t param;
  231         /*
  232          * We include this to 0 it since only a missing cookie will cause
  233          * this error.
  234          */
  235         uint16_t resv;
  236 }                        SCTP_PACKED;
  237 
  238 struct sctp_unresolv_addr {
  239         uint16_t cause;
  240         uint16_t length;
  241         uint16_t addr_type;
  242         uint16_t reserved;      /* Only one invalid addr type */
  243 }                  SCTP_PACKED;
  244 
  245 /* state cookie parameter */
  246 struct sctp_state_cookie_param {
  247         struct sctp_paramhdr ph;
  248         struct sctp_state_cookie cookie;
  249 }                       SCTP_PACKED;
  250 
  251 struct sctp_init_chunk {
  252         struct sctp_chunkhdr ch;
  253         struct sctp_init init;
  254 }               SCTP_PACKED;
  255 
  256 struct sctp_init_msg {
  257         struct sctphdr sh;
  258         struct sctp_init_chunk msg;
  259 }             SCTP_PACKED;
  260 
  261 /* ... used for both INIT and INIT ACK */
  262 #define sctp_init_ack           sctp_init
  263 #define sctp_init_ack_chunk     sctp_init_chunk
  264 #define sctp_init_ack_msg       sctp_init_msg
  265 
  266 
  267 /* Selective Ack (SACK) */
  268 struct sctp_gap_ack_block {
  269         uint16_t start;         /* Gap Ack block start */
  270         uint16_t end;           /* Gap Ack block end */
  271 }                  SCTP_PACKED;
  272 
  273 struct sctp_sack {
  274         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  275         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  276         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  277         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  278         /* struct sctp_gap_ack_block's follow */
  279         /* uint32_t duplicate_tsn's follow */
  280 }         SCTP_PACKED;
  281 
  282 struct sctp_sack_chunk {
  283         struct sctp_chunkhdr ch;
  284         struct sctp_sack sack;
  285 }               SCTP_PACKED;
  286 
  287 
  288 /* EY Following 3 structs define NR Selective Ack (NR_SACK) chunk */
  289 struct sctp_nr_gap_ack_block {
  290         uint16_t start;         /* NR Gap Ack block start */
  291         uint16_t end;           /* NR Gap Ack block end */
  292 }                     SCTP_PACKED;
  293 
  294 struct sctp_nr_sack {
  295         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  296         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  297         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  298         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  299         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  300         uint16_t reserved;      /* not currently used */
  301         /* struct sctp_gap_ack_block's follow */
  302         /* struct sctp_nr_gap_ack_block's follow */
  303         /* uint32_t duplicate_tsn's follow */
  304 }            SCTP_PACKED;
  305 
  306 struct sctp_nr_sack_chunk {
  307         struct sctp_chunkhdr ch;
  308         struct sctp_nr_sack nr_sack;
  309 }                  SCTP_PACKED;
  310 
  311 
  312 /* Heartbeat Request (HEARTBEAT) */
  313 struct sctp_heartbeat {
  314         struct sctp_heartbeat_info_param hb_info;
  315 }              SCTP_PACKED;
  316 
  317 struct sctp_heartbeat_chunk {
  318         struct sctp_chunkhdr ch;
  319         struct sctp_heartbeat heartbeat;
  320 }                    SCTP_PACKED;
  321 
  322 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  323 #define sctp_heartbeat_ack              sctp_heartbeat
  324 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  325 
  326 
  327 /* Abort Asssociation (ABORT) */
  328 struct sctp_abort_chunk {
  329         struct sctp_chunkhdr ch;
  330         /* optional error cause may follow */
  331 }                SCTP_PACKED;
  332 
  333 struct sctp_abort_msg {
  334         struct sctphdr sh;
  335         struct sctp_abort_chunk msg;
  336 }              SCTP_PACKED;
  337 
  338 
  339 /* Shutdown Association (SHUTDOWN) */
  340 struct sctp_shutdown_chunk {
  341         struct sctp_chunkhdr ch;
  342         uint32_t cumulative_tsn_ack;
  343 }                   SCTP_PACKED;
  344 
  345 
  346 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  347 struct sctp_shutdown_ack_chunk {
  348         struct sctp_chunkhdr ch;
  349 }                       SCTP_PACKED;
  350 
  351 
  352 /* Operation Error (ERROR) */
  353 struct sctp_error_chunk {
  354         struct sctp_chunkhdr ch;
  355         /* optional error causes follow */
  356 }                SCTP_PACKED;
  357 
  358 
  359 /* Cookie Echo (COOKIE ECHO) */
  360 struct sctp_cookie_echo_chunk {
  361         struct sctp_chunkhdr ch;
  362         struct sctp_state_cookie cookie;
  363 }                      SCTP_PACKED;
  364 
  365 /* Cookie Acknowledgment (COOKIE ACK) */
  366 struct sctp_cookie_ack_chunk {
  367         struct sctp_chunkhdr ch;
  368 }                     SCTP_PACKED;
  369 
  370 /* Explicit Congestion Notification Echo (ECNE) */
  371 struct sctp_ecne_chunk {
  372         struct sctp_chunkhdr ch;
  373         uint32_t tsn;
  374 }               SCTP_PACKED;
  375 
  376 /* Congestion Window Reduced (CWR) */
  377 struct sctp_cwr_chunk {
  378         struct sctp_chunkhdr ch;
  379         uint32_t tsn;
  380 }              SCTP_PACKED;
  381 
  382 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  383 struct sctp_shutdown_complete_chunk {
  384         struct sctp_chunkhdr ch;
  385 }                            SCTP_PACKED;
  386 
  387 /* Oper error holding a stale cookie */
  388 struct sctp_stale_cookie_msg {
  389         struct sctp_paramhdr ph;/* really an error cause */
  390         uint32_t time_usec;
  391 }                     SCTP_PACKED;
  392 
  393 struct sctp_adaptation_layer_indication {
  394         struct sctp_paramhdr ph;
  395         uint32_t indication;
  396 }                                SCTP_PACKED;
  397 
  398 struct sctp_cookie_while_shutting_down {
  399         struct sctphdr sh;
  400         struct sctp_chunkhdr ch;
  401         struct sctp_paramhdr ph;/* really an error cause */
  402 }                               SCTP_PACKED;
  403 
  404 struct sctp_shutdown_complete_msg {
  405         struct sctphdr sh;
  406         struct sctp_shutdown_complete_chunk shut_cmp;
  407 }                          SCTP_PACKED;
  408 
  409 /*
  410  * draft-ietf-tsvwg-addip-sctp
  411  */
  412 /* Address/Stream Configuration Change (ASCONF) */
  413 struct sctp_asconf_chunk {
  414         struct sctp_chunkhdr ch;
  415         uint32_t serial_number;
  416         /* lookup address parameter (mandatory) */
  417         /* asconf parameters follow */
  418 }                 SCTP_PACKED;
  419 
  420 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  421 struct sctp_asconf_ack_chunk {
  422         struct sctp_chunkhdr ch;
  423         uint32_t serial_number;
  424         /* asconf parameters follow */
  425 }                     SCTP_PACKED;
  426 
  427 /* draft-ietf-tsvwg-prsctp */
  428 /* Forward Cumulative TSN (FORWARD TSN) */
  429 struct sctp_forward_tsn_chunk {
  430         struct sctp_chunkhdr ch;
  431         uint32_t new_cumulative_tsn;
  432         /* stream/sequence pairs (sctp_strseq) follow */
  433 }                      SCTP_PACKED;
  434 
  435 struct sctp_strseq {
  436         uint16_t stream;
  437         uint16_t sequence;
  438 }           SCTP_PACKED;
  439 
  440 struct sctp_forward_tsn_msg {
  441         struct sctphdr sh;
  442         struct sctp_forward_tsn_chunk msg;
  443 }                    SCTP_PACKED;
  444 
  445 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  446 
  447 #define SCTP_NUM_DB_TO_VERIFY 31
  448 
  449 struct sctp_chunk_desc {
  450         uint8_t chunk_type;
  451         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  452         uint32_t tsn_ifany;
  453 }               SCTP_PACKED;
  454 
  455 
  456 struct sctp_pktdrop_chunk {
  457         struct sctp_chunkhdr ch;
  458         uint32_t bottle_bw;
  459         uint32_t current_onq;
  460         uint16_t trunc_len;
  461         uint16_t reserved;
  462         uint8_t data[0];
  463 }                  SCTP_PACKED;
  464 
  465 /**********STREAM RESET STUFF ******************/
  466 
  467 struct sctp_stream_reset_out_request {
  468         struct sctp_paramhdr ph;
  469         uint32_t request_seq;   /* monotonically increasing seq no */
  470         uint32_t response_seq;  /* if a response, the resp seq no */
  471         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  472         uint16_t list_of_streams[0];    /* if not all list of streams */
  473 }                             SCTP_PACKED;
  474 
  475 struct sctp_stream_reset_in_request {
  476         struct sctp_paramhdr ph;
  477         uint32_t request_seq;
  478         uint16_t list_of_streams[0];    /* if not all list of streams */
  479 }                            SCTP_PACKED;
  480 
  481 
  482 struct sctp_stream_reset_tsn_request {
  483         struct sctp_paramhdr ph;
  484         uint32_t request_seq;
  485 }                             SCTP_PACKED;
  486 
  487 struct sctp_stream_reset_response {
  488         struct sctp_paramhdr ph;
  489         uint32_t response_seq;  /* if a response, the resp seq no */
  490         uint32_t result;
  491 }                          SCTP_PACKED;
  492 
  493 struct sctp_stream_reset_response_tsn {
  494         struct sctp_paramhdr ph;
  495         uint32_t response_seq;  /* if a response, the resp seq no */
  496         uint32_t result;
  497         uint32_t senders_next_tsn;
  498         uint32_t receivers_next_tsn;
  499 }                              SCTP_PACKED;
  500 
  501 
  502 
  503 #define SCTP_STREAM_RESET_NOTHING   0x00000000  /* Nothing for me to do */
  504 #define SCTP_STREAM_RESET_PERFORMED 0x00000001  /* Did it */
  505 #define SCTP_STREAM_RESET_DENIED    0x00000002  /* refused to do it */
  506 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003  /* bad Stream no */
  507 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004  /* collision, try again */
  508 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005  /* bad str-reset seq no */
  509 
  510 /*
  511  * convience structures, note that if you are making a request for specific
  512  * streams then the request will need to be an overlay structure.
  513  */
  514 
  515 struct sctp_stream_reset_out_req {
  516         struct sctp_chunkhdr ch;
  517         struct sctp_stream_reset_out_request sr_req;
  518 }                         SCTP_PACKED;
  519 
  520 struct sctp_stream_reset_in_req {
  521         struct sctp_chunkhdr ch;
  522         struct sctp_stream_reset_in_request sr_req;
  523 }                        SCTP_PACKED;
  524 
  525 struct sctp_stream_reset_tsn_req {
  526         struct sctp_chunkhdr ch;
  527         struct sctp_stream_reset_tsn_request sr_req;
  528 }                         SCTP_PACKED;
  529 
  530 struct sctp_stream_reset_resp {
  531         struct sctp_chunkhdr ch;
  532         struct sctp_stream_reset_response sr_resp;
  533 }                      SCTP_PACKED;
  534 
  535 /* respone only valid with a TSN request */
  536 struct sctp_stream_reset_resp_tsn {
  537         struct sctp_chunkhdr ch;
  538         struct sctp_stream_reset_response_tsn sr_resp;
  539 }                          SCTP_PACKED;
  540 
  541 /****************************************************/
  542 
  543 /*
  544  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  545  */
  546 
  547 /* Should we make the max be 32? */
  548 #define SCTP_RANDOM_MAX_SIZE 256
  549 struct sctp_auth_random {
  550         struct sctp_paramhdr ph;/* type = 0x8002 */
  551         uint8_t random_data[0];
  552 }                SCTP_PACKED;
  553 
  554 struct sctp_auth_chunk_list {
  555         struct sctp_paramhdr ph;/* type = 0x8003 */
  556         uint8_t chunk_types[0];
  557 }                    SCTP_PACKED;
  558 
  559 struct sctp_auth_hmac_algo {
  560         struct sctp_paramhdr ph;/* type = 0x8004 */
  561         uint16_t hmac_ids[0];
  562 }                   SCTP_PACKED;
  563 
  564 struct sctp_auth_chunk {
  565         struct sctp_chunkhdr ch;
  566         uint16_t shared_key_id;
  567         uint16_t hmac_id;
  568         uint8_t hmac[0];
  569 }               SCTP_PACKED;
  570 
  571 struct sctp_auth_invalid_hmac {
  572         struct sctp_paramhdr ph;
  573         uint16_t hmac_id;
  574         uint16_t padding;
  575 }                      SCTP_PACKED;
  576 
  577 /*
  578  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  579  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  580  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  581  * data chunk I will split into. We could increase throughput slightly by
  582  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  583  * feel is worth it for now.
  584  */
  585 #ifndef SCTP_MAX_OVERHEAD
  586 #ifdef INET6
  587 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  588                            sizeof(struct sctphdr) + \
  589                            sizeof(struct sctp_ecne_chunk) + \
  590                            sizeof(struct sctp_sack_chunk) + \
  591                            sizeof(struct ip6_hdr))
  592 
  593 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  594                            sizeof(struct sctphdr) + \
  595                            sizeof(struct ip6_hdr))
  596 
  597 
  598 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  599                            sizeof(struct sctphdr))
  600 
  601 #else
  602 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  603                            sizeof(struct sctphdr) + \
  604                            sizeof(struct sctp_ecne_chunk) + \
  605                            sizeof(struct sctp_sack_chunk) + \
  606                            sizeof(struct ip))
  607 
  608 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  609                            sizeof(struct sctphdr) + \
  610                            sizeof(struct ip))
  611 
  612 
  613 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  614                            sizeof(struct sctphdr))
  615 
  616 #endif                          /* INET6 */
  617 #endif                          /* !SCTP_MAX_OVERHEAD */
  618 
  619 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  620                               sizeof(struct sctphdr) + \
  621                               sizeof(struct ip))
  622 
  623 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  624                               sizeof(struct sctphdr))
  625 
  626 #undef SCTP_PACKED
  627 #endif                          /* !__sctp_header_h__ */

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