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/8.2/sys/netinet/sctp_header.h 206734 2010-04-17 04:00:57Z 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 }                          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[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[];
  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[];
  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 struct sctp_nr_sack {
  288         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  289         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  290         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  291         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  292         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  293         uint16_t reserved;      /* not currently used */
  294         /* struct sctp_gap_ack_block's follow */
  295         /* uint32_t duplicate_tsn's follow */
  296 }            SCTP_PACKED;
  297 
  298 struct sctp_nr_sack_chunk {
  299         struct sctp_chunkhdr ch;
  300         struct sctp_nr_sack nr_sack;
  301 }                  SCTP_PACKED;
  302 
  303 
  304 /* Heartbeat Request (HEARTBEAT) */
  305 struct sctp_heartbeat {
  306         struct sctp_heartbeat_info_param hb_info;
  307 }              SCTP_PACKED;
  308 
  309 struct sctp_heartbeat_chunk {
  310         struct sctp_chunkhdr ch;
  311         struct sctp_heartbeat heartbeat;
  312 }                    SCTP_PACKED;
  313 
  314 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  315 #define sctp_heartbeat_ack              sctp_heartbeat
  316 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  317 
  318 
  319 /* Abort Asssociation (ABORT) */
  320 struct sctp_abort_chunk {
  321         struct sctp_chunkhdr ch;
  322         /* optional error cause may follow */
  323 }                SCTP_PACKED;
  324 
  325 struct sctp_abort_msg {
  326         struct sctphdr sh;
  327         struct sctp_abort_chunk msg;
  328 }              SCTP_PACKED;
  329 
  330 
  331 /* Shutdown Association (SHUTDOWN) */
  332 struct sctp_shutdown_chunk {
  333         struct sctp_chunkhdr ch;
  334         uint32_t cumulative_tsn_ack;
  335 }                   SCTP_PACKED;
  336 
  337 
  338 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  339 struct sctp_shutdown_ack_chunk {
  340         struct sctp_chunkhdr ch;
  341 }                       SCTP_PACKED;
  342 
  343 
  344 /* Operation Error (ERROR) */
  345 struct sctp_error_chunk {
  346         struct sctp_chunkhdr ch;
  347         /* optional error causes follow */
  348 }                SCTP_PACKED;
  349 
  350 
  351 /* Cookie Echo (COOKIE ECHO) */
  352 struct sctp_cookie_echo_chunk {
  353         struct sctp_chunkhdr ch;
  354         struct sctp_state_cookie cookie;
  355 }                      SCTP_PACKED;
  356 
  357 /* Cookie Acknowledgment (COOKIE ACK) */
  358 struct sctp_cookie_ack_chunk {
  359         struct sctp_chunkhdr ch;
  360 }                     SCTP_PACKED;
  361 
  362 /* Explicit Congestion Notification Echo (ECNE) */
  363 struct sctp_ecne_chunk {
  364         struct sctp_chunkhdr ch;
  365         uint32_t tsn;
  366 }               SCTP_PACKED;
  367 
  368 /* Congestion Window Reduced (CWR) */
  369 struct sctp_cwr_chunk {
  370         struct sctp_chunkhdr ch;
  371         uint32_t tsn;
  372 }              SCTP_PACKED;
  373 
  374 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  375 struct sctp_shutdown_complete_chunk {
  376         struct sctp_chunkhdr ch;
  377 }                            SCTP_PACKED;
  378 
  379 /* Oper error holding a stale cookie */
  380 struct sctp_stale_cookie_msg {
  381         struct sctp_paramhdr ph;/* really an error cause */
  382         uint32_t time_usec;
  383 }                     SCTP_PACKED;
  384 
  385 struct sctp_adaptation_layer_indication {
  386         struct sctp_paramhdr ph;
  387         uint32_t indication;
  388 }                                SCTP_PACKED;
  389 
  390 struct sctp_cookie_while_shutting_down {
  391         struct sctphdr sh;
  392         struct sctp_chunkhdr ch;
  393         struct sctp_paramhdr ph;/* really an error cause */
  394 }                               SCTP_PACKED;
  395 
  396 struct sctp_shutdown_complete_msg {
  397         struct sctphdr sh;
  398         struct sctp_shutdown_complete_chunk shut_cmp;
  399 }                          SCTP_PACKED;
  400 
  401 /*
  402  * draft-ietf-tsvwg-addip-sctp
  403  */
  404 /* Address/Stream Configuration Change (ASCONF) */
  405 struct sctp_asconf_chunk {
  406         struct sctp_chunkhdr ch;
  407         uint32_t serial_number;
  408         /* lookup address parameter (mandatory) */
  409         /* asconf parameters follow */
  410 }                 SCTP_PACKED;
  411 
  412 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  413 struct sctp_asconf_ack_chunk {
  414         struct sctp_chunkhdr ch;
  415         uint32_t serial_number;
  416         /* asconf parameters follow */
  417 }                     SCTP_PACKED;
  418 
  419 /* draft-ietf-tsvwg-prsctp */
  420 /* Forward Cumulative TSN (FORWARD TSN) */
  421 struct sctp_forward_tsn_chunk {
  422         struct sctp_chunkhdr ch;
  423         uint32_t new_cumulative_tsn;
  424         /* stream/sequence pairs (sctp_strseq) follow */
  425 }                      SCTP_PACKED;
  426 
  427 struct sctp_strseq {
  428         uint16_t stream;
  429         uint16_t sequence;
  430 }           SCTP_PACKED;
  431 
  432 struct sctp_forward_tsn_msg {
  433         struct sctphdr sh;
  434         struct sctp_forward_tsn_chunk msg;
  435 }                    SCTP_PACKED;
  436 
  437 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  438 
  439 #define SCTP_NUM_DB_TO_VERIFY 31
  440 
  441 struct sctp_chunk_desc {
  442         uint8_t chunk_type;
  443         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  444         uint32_t tsn_ifany;
  445 }               SCTP_PACKED;
  446 
  447 
  448 struct sctp_pktdrop_chunk {
  449         struct sctp_chunkhdr ch;
  450         uint32_t bottle_bw;
  451         uint32_t current_onq;
  452         uint16_t trunc_len;
  453         uint16_t reserved;
  454         uint8_t data[];
  455 }                  SCTP_PACKED;
  456 
  457 /**********STREAM RESET STUFF ******************/
  458 
  459 struct sctp_stream_reset_out_request {
  460         struct sctp_paramhdr ph;
  461         uint32_t request_seq;   /* monotonically increasing seq no */
  462         uint32_t response_seq;  /* if a response, the resp seq no */
  463         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  464         uint16_t list_of_streams[];     /* if not all list of streams */
  465 }                             SCTP_PACKED;
  466 
  467 struct sctp_stream_reset_in_request {
  468         struct sctp_paramhdr ph;
  469         uint32_t request_seq;
  470         uint16_t list_of_streams[];     /* if not all list of streams */
  471 }                            SCTP_PACKED;
  472 
  473 
  474 struct sctp_stream_reset_tsn_request {
  475         struct sctp_paramhdr ph;
  476         uint32_t request_seq;
  477 }                             SCTP_PACKED;
  478 
  479 struct sctp_stream_reset_response {
  480         struct sctp_paramhdr ph;
  481         uint32_t response_seq;  /* if a response, the resp seq no */
  482         uint32_t result;
  483 }                          SCTP_PACKED;
  484 
  485 struct sctp_stream_reset_response_tsn {
  486         struct sctp_paramhdr ph;
  487         uint32_t response_seq;  /* if a response, the resp seq no */
  488         uint32_t result;
  489         uint32_t senders_next_tsn;
  490         uint32_t receivers_next_tsn;
  491 }                              SCTP_PACKED;
  492 
  493 struct sctp_stream_reset_add_strm {
  494         struct sctp_paramhdr ph;
  495         uint32_t request_seq;
  496         uint16_t number_of_streams;
  497         uint16_t reserved;
  498 }                          SCTP_PACKED;
  499 
  500 #define SCTP_STREAM_RESET_NOTHING   0x00000000  /* Nothing for me to do */
  501 #define SCTP_STREAM_RESET_PERFORMED 0x00000001  /* Did it */
  502 #define SCTP_STREAM_RESET_DENIED    0x00000002  /* refused to do it */
  503 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003  /* bad Stream no */
  504 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004  /* collision, try again */
  505 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005  /* bad str-reset seq no */
  506 
  507 /*
  508  * convience structures, note that if you are making a request for specific
  509  * streams then the request will need to be an overlay structure.
  510  */
  511 
  512 struct sctp_stream_reset_out_req {
  513         struct sctp_chunkhdr ch;
  514         struct sctp_stream_reset_out_request sr_req;
  515 }                         SCTP_PACKED;
  516 
  517 struct sctp_stream_reset_in_req {
  518         struct sctp_chunkhdr ch;
  519         struct sctp_stream_reset_in_request sr_req;
  520 }                        SCTP_PACKED;
  521 
  522 struct sctp_stream_reset_tsn_req {
  523         struct sctp_chunkhdr ch;
  524         struct sctp_stream_reset_tsn_request sr_req;
  525 }                         SCTP_PACKED;
  526 
  527 struct sctp_stream_reset_resp {
  528         struct sctp_chunkhdr ch;
  529         struct sctp_stream_reset_response sr_resp;
  530 }                      SCTP_PACKED;
  531 
  532 /* respone only valid with a TSN request */
  533 struct sctp_stream_reset_resp_tsn {
  534         struct sctp_chunkhdr ch;
  535         struct sctp_stream_reset_response_tsn sr_resp;
  536 }                          SCTP_PACKED;
  537 
  538 /****************************************************/
  539 
  540 /*
  541  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  542  */
  543 
  544 /* Should we make the max be 32? */
  545 #define SCTP_RANDOM_MAX_SIZE 256
  546 struct sctp_auth_random {
  547         struct sctp_paramhdr ph;/* type = 0x8002 */
  548         uint8_t random_data[];
  549 }                SCTP_PACKED;
  550 
  551 struct sctp_auth_chunk_list {
  552         struct sctp_paramhdr ph;/* type = 0x8003 */
  553         uint8_t chunk_types[];
  554 }                    SCTP_PACKED;
  555 
  556 struct sctp_auth_hmac_algo {
  557         struct sctp_paramhdr ph;/* type = 0x8004 */
  558         uint16_t hmac_ids[];
  559 }                   SCTP_PACKED;
  560 
  561 struct sctp_auth_chunk {
  562         struct sctp_chunkhdr ch;
  563         uint16_t shared_key_id;
  564         uint16_t hmac_id;
  565         uint8_t hmac[];
  566 }               SCTP_PACKED;
  567 
  568 struct sctp_auth_invalid_hmac {
  569         struct sctp_paramhdr ph;
  570         uint16_t hmac_id;
  571         uint16_t padding;
  572 }                      SCTP_PACKED;
  573 
  574 /*
  575  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  576  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  577  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  578  * data chunk I will split into. We could increase throughput slightly by
  579  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  580  * feel is worth it for now.
  581  */
  582 #ifndef SCTP_MAX_OVERHEAD
  583 #ifdef INET6
  584 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  585                            sizeof(struct sctphdr) + \
  586                            sizeof(struct sctp_ecne_chunk) + \
  587                            sizeof(struct sctp_sack_chunk) + \
  588                            sizeof(struct ip6_hdr))
  589 
  590 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  591                            sizeof(struct sctphdr) + \
  592                            sizeof(struct ip6_hdr))
  593 
  594 
  595 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  596                            sizeof(struct sctphdr))
  597 
  598 #else
  599 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  600                            sizeof(struct sctphdr) + \
  601                            sizeof(struct sctp_ecne_chunk) + \
  602                            sizeof(struct sctp_sack_chunk) + \
  603                            sizeof(struct ip))
  604 
  605 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  606                            sizeof(struct sctphdr) + \
  607                            sizeof(struct ip))
  608 
  609 
  610 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  611                            sizeof(struct sctphdr))
  612 
  613 #endif                          /* INET6 */
  614 #endif                          /* !SCTP_MAX_OVERHEAD */
  615 
  616 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  617                               sizeof(struct sctphdr) + \
  618                               sizeof(struct ip))
  619 
  620 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  621                               sizeof(struct sctphdr))
  622 
  623 #undef SCTP_PACKED
  624 #endif                          /* !__sctp_header_h__ */

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