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) 2008-2011, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2011, 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 /* $KAME: sctp_header.h,v 1.14 2005/03/06 16:04:17 itojun Exp $  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.3/sys/netinet/sctp_header.h 231490 2012-02-11 00:54:24Z tuexen $");
   37 
   38 #ifndef __sctp_header_h__
   39 #define __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 /* ECN parameter */
   88 struct sctp_ecn_supported_param {
   89         struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */
   90 }                        SCTP_PACKED;
   91 
   92 
   93 /* heartbeat info parameter */
   94 struct sctp_heartbeat_info_param {
   95         struct sctp_paramhdr ph;
   96         uint32_t time_value_1;
   97         uint32_t time_value_2;
   98         uint32_t random_value1;
   99         uint32_t random_value2;
  100         uint8_t addr_family;
  101         uint8_t addr_len;
  102         /* make sure that this structure is 4 byte aligned */
  103         uint8_t padding[2];
  104         char address[SCTP_ADDRMAX];
  105 }                         SCTP_PACKED;
  106 
  107 
  108 /* draft-ietf-tsvwg-prsctp */
  109 /* PR-SCTP supported parameter */
  110 struct sctp_prsctp_supported_param {
  111         struct sctp_paramhdr ph;
  112 }                           SCTP_PACKED;
  113 
  114 
  115 /* draft-ietf-tsvwg-addip-sctp */
  116 struct sctp_asconf_paramhdr {   /* an ASCONF "parameter" */
  117         struct sctp_paramhdr ph;/* a SCTP parameter header */
  118         uint32_t correlation_id;/* correlation id for this param */
  119 }                    SCTP_PACKED;
  120 
  121 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
  122         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  123         struct sctp_ipv6addr_param addrp;       /* max storage size */
  124 }                      SCTP_PACKED;
  125 
  126 
  127 struct sctp_asconf_tag_param {  /* an ASCONF NAT-Vtag parameter */
  128         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  129         uint32_t local_vtag;
  130         uint32_t remote_vtag;
  131 }                     SCTP_PACKED;
  132 
  133 
  134 struct sctp_asconf_addrv4_param {       /* an ASCONF address (v4) parameter */
  135         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  136         struct sctp_ipv4addr_param addrp;       /* max storage size */
  137 }                        SCTP_PACKED;
  138 
  139 #define SCTP_MAX_SUPPORTED_EXT 256
  140 
  141 struct sctp_supported_chunk_types_param {
  142         struct sctp_paramhdr ph;/* type = 0x8008  len = x */
  143         uint8_t chunk_types[];
  144 }                                SCTP_PACKED;
  145 
  146 
  147 /*
  148  * Structures for DATA chunks
  149  */
  150 struct sctp_data {
  151         uint32_t tsn;
  152         uint16_t stream_id;
  153         uint16_t stream_sequence;
  154         uint32_t protocol_id;
  155         /* user data follows */
  156 }         SCTP_PACKED;
  157 
  158 struct sctp_data_chunk {
  159         struct sctp_chunkhdr ch;
  160         struct sctp_data dp;
  161 }               SCTP_PACKED;
  162 
  163 /*
  164  * Structures for the control chunks
  165  */
  166 
  167 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  168 struct sctp_init {
  169         uint32_t initiate_tag;  /* initiate tag */
  170         uint32_t a_rwnd;        /* a_rwnd */
  171         uint16_t num_outbound_streams;  /* OS */
  172         uint16_t num_inbound_streams;   /* MIS */
  173         uint32_t initial_tsn;   /* I-TSN */
  174         /* optional param's follow */
  175 }         SCTP_PACKED;
  176 
  177 #define SCTP_IDENTIFICATION_SIZE 16
  178 #define SCTP_ADDRESS_SIZE 4
  179 #define SCTP_RESERVE_SPACE 6
  180 /* state cookie header */
  181 struct sctp_state_cookie {      /* this is our definition... */
  182         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  183         struct timeval time_entered;    /* the time I built cookie */
  184         uint32_t cookie_life;   /* life I will award this cookie */
  185         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  186 
  187         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  188         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  189 
  190         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  191         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  192         uint32_t addr_type;     /* address type */
  193         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  194         uint32_t laddr_type;    /* my local from address type */
  195         uint32_t scope_id;      /* v6 scope id for link-locals */
  196 
  197         uint16_t peerport;      /* port address of the peer in the INIT */
  198         uint16_t myport;        /* my port address used in the INIT */
  199         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  200         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  201         uint8_t local_scope;    /* IPv6 local scope flag */
  202         uint8_t site_scope;     /* IPv6 site scope flag */
  203 
  204         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  205         uint8_t loopback_scope; /* loopback scope information */
  206         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  207         /*
  208          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  209          * (minus the cookie).
  210          */
  211 }                 SCTP_PACKED;
  212 
  213 
  214 /* Used for NAT state error cause */
  215 struct sctp_missing_nat_state {
  216         uint16_t cause;
  217         uint16_t length;
  218         uint8_t data[];
  219 }                      SCTP_PACKED;
  220 
  221 
  222 struct sctp_inv_mandatory_param {
  223         uint16_t cause;
  224         uint16_t length;
  225         uint32_t num_param;
  226         uint16_t param;
  227         /*
  228          * We include this to 0 it since only a missing cookie will cause
  229          * this error.
  230          */
  231         uint16_t resv;
  232 }                        SCTP_PACKED;
  233 
  234 struct sctp_unresolv_addr {
  235         uint16_t cause;
  236         uint16_t length;
  237         uint16_t addr_type;
  238         uint16_t reserved;      /* Only one invalid addr type */
  239 }                  SCTP_PACKED;
  240 
  241 /* state cookie parameter */
  242 struct sctp_state_cookie_param {
  243         struct sctp_paramhdr ph;
  244         struct sctp_state_cookie cookie;
  245 }                       SCTP_PACKED;
  246 
  247 struct sctp_init_chunk {
  248         struct sctp_chunkhdr ch;
  249         struct sctp_init init;
  250 }               SCTP_PACKED;
  251 
  252 struct sctp_init_msg {
  253         struct sctphdr sh;
  254         struct sctp_init_chunk msg;
  255 }             SCTP_PACKED;
  256 
  257 /* ... used for both INIT and INIT ACK */
  258 #define sctp_init_ack           sctp_init
  259 #define sctp_init_ack_chunk     sctp_init_chunk
  260 #define sctp_init_ack_msg       sctp_init_msg
  261 
  262 
  263 /* Selective Ack (SACK) */
  264 struct sctp_gap_ack_block {
  265         uint16_t start;         /* Gap Ack block start */
  266         uint16_t end;           /* Gap Ack block end */
  267 }                  SCTP_PACKED;
  268 
  269 struct sctp_sack {
  270         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  271         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  272         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  273         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  274         /* struct sctp_gap_ack_block's follow */
  275         /* uint32_t duplicate_tsn's follow */
  276 }         SCTP_PACKED;
  277 
  278 struct sctp_sack_chunk {
  279         struct sctp_chunkhdr ch;
  280         struct sctp_sack sack;
  281 }               SCTP_PACKED;
  282 
  283 struct sctp_nr_sack {
  284         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  285         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  286         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  287         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  288         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  289         uint16_t reserved;      /* not currently used */
  290         /* struct sctp_gap_ack_block's follow */
  291         /* uint32_t duplicate_tsn's follow */
  292 }            SCTP_PACKED;
  293 
  294 struct sctp_nr_sack_chunk {
  295         struct sctp_chunkhdr ch;
  296         struct sctp_nr_sack nr_sack;
  297 }                  SCTP_PACKED;
  298 
  299 
  300 /* Heartbeat Request (HEARTBEAT) */
  301 struct sctp_heartbeat {
  302         struct sctp_heartbeat_info_param hb_info;
  303 }              SCTP_PACKED;
  304 
  305 struct sctp_heartbeat_chunk {
  306         struct sctp_chunkhdr ch;
  307         struct sctp_heartbeat heartbeat;
  308 }                    SCTP_PACKED;
  309 
  310 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  311 #define sctp_heartbeat_ack              sctp_heartbeat
  312 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  313 
  314 
  315 /* Abort Asssociation (ABORT) */
  316 struct sctp_abort_chunk {
  317         struct sctp_chunkhdr ch;
  318         /* optional error cause may follow */
  319 }                SCTP_PACKED;
  320 
  321 struct sctp_abort_msg {
  322         struct sctphdr sh;
  323         struct sctp_abort_chunk msg;
  324 }              SCTP_PACKED;
  325 
  326 
  327 /* Shutdown Association (SHUTDOWN) */
  328 struct sctp_shutdown_chunk {
  329         struct sctp_chunkhdr ch;
  330         uint32_t cumulative_tsn_ack;
  331 }                   SCTP_PACKED;
  332 
  333 
  334 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  335 struct sctp_shutdown_ack_chunk {
  336         struct sctp_chunkhdr ch;
  337 }                       SCTP_PACKED;
  338 
  339 
  340 /* Operation Error (ERROR) */
  341 struct sctp_error_chunk {
  342         struct sctp_chunkhdr ch;
  343         /* optional error causes follow */
  344 }                SCTP_PACKED;
  345 
  346 
  347 /* Cookie Echo (COOKIE ECHO) */
  348 struct sctp_cookie_echo_chunk {
  349         struct sctp_chunkhdr ch;
  350         struct sctp_state_cookie cookie;
  351 }                      SCTP_PACKED;
  352 
  353 /* Cookie Acknowledgment (COOKIE ACK) */
  354 struct sctp_cookie_ack_chunk {
  355         struct sctp_chunkhdr ch;
  356 }                     SCTP_PACKED;
  357 
  358 /* Explicit Congestion Notification Echo (ECNE) */
  359 struct old_sctp_ecne_chunk {
  360         struct sctp_chunkhdr ch;
  361         uint32_t tsn;
  362 }                   SCTP_PACKED;
  363 
  364 struct sctp_ecne_chunk {
  365         struct sctp_chunkhdr ch;
  366         uint32_t tsn;
  367         uint32_t num_pkts_since_cwr;
  368 }               SCTP_PACKED;
  369 
  370 /* Congestion Window Reduced (CWR) */
  371 struct sctp_cwr_chunk {
  372         struct sctp_chunkhdr ch;
  373         uint32_t tsn;
  374 }              SCTP_PACKED;
  375 
  376 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  377 struct sctp_shutdown_complete_chunk {
  378         struct sctp_chunkhdr ch;
  379 }                            SCTP_PACKED;
  380 
  381 /* Oper error holding a stale cookie */
  382 struct sctp_stale_cookie_msg {
  383         struct sctp_paramhdr ph;/* really an error cause */
  384         uint32_t time_usec;
  385 }                     SCTP_PACKED;
  386 
  387 struct sctp_adaptation_layer_indication {
  388         struct sctp_paramhdr ph;
  389         uint32_t indication;
  390 }                                SCTP_PACKED;
  391 
  392 struct sctp_cookie_while_shutting_down {
  393         struct sctphdr sh;
  394         struct sctp_chunkhdr ch;
  395         struct sctp_paramhdr ph;/* really an error cause */
  396 }                               SCTP_PACKED;
  397 
  398 struct sctp_shutdown_complete_msg {
  399         struct sctphdr sh;
  400         struct sctp_shutdown_complete_chunk shut_cmp;
  401 }                          SCTP_PACKED;
  402 
  403 /*
  404  * draft-ietf-tsvwg-addip-sctp
  405  */
  406 /* Address/Stream Configuration Change (ASCONF) */
  407 struct sctp_asconf_chunk {
  408         struct sctp_chunkhdr ch;
  409         uint32_t serial_number;
  410         /* lookup address parameter (mandatory) */
  411         /* asconf parameters follow */
  412 }                 SCTP_PACKED;
  413 
  414 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  415 struct sctp_asconf_ack_chunk {
  416         struct sctp_chunkhdr ch;
  417         uint32_t serial_number;
  418         /* asconf parameters follow */
  419 }                     SCTP_PACKED;
  420 
  421 /* draft-ietf-tsvwg-prsctp */
  422 /* Forward Cumulative TSN (FORWARD TSN) */
  423 struct sctp_forward_tsn_chunk {
  424         struct sctp_chunkhdr ch;
  425         uint32_t new_cumulative_tsn;
  426         /* stream/sequence pairs (sctp_strseq) follow */
  427 }                      SCTP_PACKED;
  428 
  429 struct sctp_strseq {
  430         uint16_t stream;
  431         uint16_t sequence;
  432 }           SCTP_PACKED;
  433 
  434 struct sctp_forward_tsn_msg {
  435         struct sctphdr sh;
  436         struct sctp_forward_tsn_chunk msg;
  437 }                    SCTP_PACKED;
  438 
  439 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  440 
  441 #define SCTP_NUM_DB_TO_VERIFY 31
  442 
  443 struct sctp_chunk_desc {
  444         uint8_t chunk_type;
  445         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  446         uint32_t tsn_ifany;
  447 }               SCTP_PACKED;
  448 
  449 
  450 struct sctp_pktdrop_chunk {
  451         struct sctp_chunkhdr ch;
  452         uint32_t bottle_bw;
  453         uint32_t current_onq;
  454         uint16_t trunc_len;
  455         uint16_t reserved;
  456         uint8_t data[];
  457 }                  SCTP_PACKED;
  458 
  459 /**********STREAM RESET STUFF ******************/
  460 
  461 struct sctp_stream_reset_out_request {
  462         struct sctp_paramhdr ph;
  463         uint32_t request_seq;   /* monotonically increasing seq no */
  464         uint32_t response_seq;  /* if a response, the resp seq no */
  465         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  466         uint16_t list_of_streams[];     /* if not all list of streams */
  467 }                             SCTP_PACKED;
  468 
  469 struct sctp_stream_reset_in_request {
  470         struct sctp_paramhdr ph;
  471         uint32_t request_seq;
  472         uint16_t list_of_streams[];     /* if not all list of streams */
  473 }                            SCTP_PACKED;
  474 
  475 
  476 struct sctp_stream_reset_tsn_request {
  477         struct sctp_paramhdr ph;
  478         uint32_t request_seq;
  479 }                             SCTP_PACKED;
  480 
  481 struct sctp_stream_reset_response {
  482         struct sctp_paramhdr ph;
  483         uint32_t response_seq;  /* if a response, the resp seq no */
  484         uint32_t result;
  485 }                          SCTP_PACKED;
  486 
  487 struct sctp_stream_reset_response_tsn {
  488         struct sctp_paramhdr ph;
  489         uint32_t response_seq;  /* if a response, the resp seq no */
  490         uint32_t result;
  491         uint32_t senders_next_tsn;
  492         uint32_t receivers_next_tsn;
  493 }                              SCTP_PACKED;
  494 
  495 struct sctp_stream_reset_add_strm {
  496         struct sctp_paramhdr ph;
  497         uint32_t request_seq;
  498         uint16_t number_of_streams;
  499         uint16_t reserved;
  500 }                          SCTP_PACKED;
  501 
  502 #define SCTP_STREAM_RESET_NOTHING   0x00000000  /* Nothing for me to do */
  503 #define SCTP_STREAM_RESET_PERFORMED 0x00000001  /* Did it */
  504 #define SCTP_STREAM_RESET_DENIED    0x00000002  /* refused to do it */
  505 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003  /* bad Stream no */
  506 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004  /* collision, try again */
  507 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005  /* bad str-reset seq no */
  508 
  509 /*
  510  * convience structures, note that if you are making a request for specific
  511  * streams then the request will need to be an overlay structure.
  512  */
  513 
  514 struct sctp_stream_reset_out_req {
  515         struct sctp_chunkhdr ch;
  516         struct sctp_stream_reset_out_request sr_req;
  517 }                         SCTP_PACKED;
  518 
  519 struct sctp_stream_reset_in_req {
  520         struct sctp_chunkhdr ch;
  521         struct sctp_stream_reset_in_request sr_req;
  522 }                        SCTP_PACKED;
  523 
  524 struct sctp_stream_reset_tsn_req {
  525         struct sctp_chunkhdr ch;
  526         struct sctp_stream_reset_tsn_request sr_req;
  527 }                         SCTP_PACKED;
  528 
  529 struct sctp_stream_reset_resp {
  530         struct sctp_chunkhdr ch;
  531         struct sctp_stream_reset_response sr_resp;
  532 }                      SCTP_PACKED;
  533 
  534 /* respone only valid with a TSN request */
  535 struct sctp_stream_reset_resp_tsn {
  536         struct sctp_chunkhdr ch;
  537         struct sctp_stream_reset_response_tsn sr_resp;
  538 }                          SCTP_PACKED;
  539 
  540 /****************************************************/
  541 
  542 /*
  543  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  544  */
  545 
  546 /* Should we make the max be 32? */
  547 #define SCTP_RANDOM_MAX_SIZE 256
  548 struct sctp_auth_random {
  549         struct sctp_paramhdr ph;/* type = 0x8002 */
  550         uint8_t random_data[];
  551 }                SCTP_PACKED;
  552 
  553 struct sctp_auth_chunk_list {
  554         struct sctp_paramhdr ph;/* type = 0x8003 */
  555         uint8_t chunk_types[];
  556 }                    SCTP_PACKED;
  557 
  558 struct sctp_auth_hmac_algo {
  559         struct sctp_paramhdr ph;/* type = 0x8004 */
  560         uint16_t hmac_ids[];
  561 }                   SCTP_PACKED;
  562 
  563 struct sctp_auth_chunk {
  564         struct sctp_chunkhdr ch;
  565         uint16_t shared_key_id;
  566         uint16_t hmac_id;
  567         uint8_t hmac[];
  568 }               SCTP_PACKED;
  569 
  570 struct sctp_auth_invalid_hmac {
  571         struct sctp_paramhdr ph;
  572         uint16_t hmac_id;
  573         uint16_t padding;
  574 }                      SCTP_PACKED;
  575 
  576 /*
  577  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  578  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  579  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  580  * data chunk I will split into. We could increase throughput slightly by
  581  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  582  * feel is worth it for now.
  583  */
  584 #ifndef SCTP_MAX_OVERHEAD
  585 #ifdef INET6
  586 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  587                            sizeof(struct sctphdr) + \
  588                            sizeof(struct sctp_ecne_chunk) + \
  589                            sizeof(struct sctp_sack_chunk) + \
  590                            sizeof(struct ip6_hdr))
  591 
  592 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  593                            sizeof(struct sctphdr) + \
  594                            sizeof(struct ip6_hdr))
  595 
  596 
  597 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  598                            sizeof(struct sctphdr))
  599 
  600 #else
  601 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  602                            sizeof(struct sctphdr) + \
  603                            sizeof(struct sctp_ecne_chunk) + \
  604                            sizeof(struct sctp_sack_chunk) + \
  605                            sizeof(struct ip))
  606 
  607 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  608                            sizeof(struct sctphdr) + \
  609                            sizeof(struct ip))
  610 
  611 
  612 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  613                            sizeof(struct sctphdr))
  614 
  615 #endif                          /* INET6 */
  616 #endif                          /* !SCTP_MAX_OVERHEAD */
  617 
  618 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  619                               sizeof(struct sctphdr) + \
  620                               sizeof(struct ip))
  621 
  622 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  623                               sizeof(struct sctphdr))
  624 
  625 #undef SCTP_PACKED
  626 #endif                          /* !__sctp_header_h__ */

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