The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_header.h

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/8.4/sys/netinet/sctp_header.h 247989 2013-03-08 00:07:19Z tuexen $");
   35 
   36 #ifndef _NETINET_SCTP_HEADER_H_
   37 #define _NETINET_SCTP_HEADER_H_
   38 
   39 #include <sys/time.h>
   40 #include <netinet/sctp.h>
   41 #include <netinet/sctp_constants.h>
   42 
   43 #define SCTP_PACKED __attribute__((packed))
   44 
   45 /*
   46  * Parameter structures
   47  */
   48 struct sctp_ipv4addr_param {
   49         struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */
   50         uint32_t addr;          /* IPV4 address */
   51 }                   SCTP_PACKED;
   52 
   53 #define SCTP_V6_ADDR_BYTES 16
   54 
   55 
   56 struct sctp_ipv6addr_param {
   57         struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */
   58         uint8_t addr[SCTP_V6_ADDR_BYTES];       /* IPV6 address */
   59 }                   SCTP_PACKED;
   60 
   61 /* Cookie Preservative */
   62 struct sctp_cookie_perserve_param {
   63         struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */
   64         uint32_t time;          /* time in ms to extend cookie */
   65 }                          SCTP_PACKED;
   66 
   67 #define SCTP_ARRAY_MIN_LEN 1
   68 /* Host Name Address */
   69 struct sctp_host_name_param {
   70         struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */
   71         char name[SCTP_ARRAY_MIN_LEN];  /* host name */
   72 }                    SCTP_PACKED;
   73 
   74 /*
   75  * This is the maximum padded size of a s-a-p
   76  * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12
   77  */
   78 #define SCTP_MAX_ADDR_PARAMS_SIZE 12
   79 /* supported address type */
   80 struct sctp_supported_addr_param {
   81         struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */
   82         uint16_t addr_type[2];  /* array of supported address types */
   83 }                         SCTP_PACKED;
   84 
   85 /* ECN parameter */
   86 struct sctp_ecn_supported_param {
   87         struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */
   88 }                        SCTP_PACKED;
   89 
   90 
   91 /* heartbeat info parameter */
   92 struct sctp_heartbeat_info_param {
   93         struct sctp_paramhdr ph;
   94         uint32_t time_value_1;
   95         uint32_t time_value_2;
   96         uint32_t random_value1;
   97         uint32_t random_value2;
   98         uint8_t addr_family;
   99         uint8_t addr_len;
  100         /* make sure that this structure is 4 byte aligned */
  101         uint8_t padding[2];
  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 /*
  146  * Structures for DATA chunks
  147  */
  148 struct sctp_data {
  149         uint32_t tsn;
  150         uint16_t stream_id;
  151         uint16_t stream_sequence;
  152         uint32_t protocol_id;
  153         /* user data follows */
  154 }         SCTP_PACKED;
  155 
  156 struct sctp_data_chunk {
  157         struct sctp_chunkhdr ch;
  158         struct sctp_data dp;
  159 }               SCTP_PACKED;
  160 
  161 /*
  162  * Structures for the control chunks
  163  */
  164 
  165 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  166 struct sctp_init {
  167         uint32_t initiate_tag;  /* initiate tag */
  168         uint32_t a_rwnd;        /* a_rwnd */
  169         uint16_t num_outbound_streams;  /* OS */
  170         uint16_t num_inbound_streams;   /* MIS */
  171         uint32_t initial_tsn;   /* I-TSN */
  172         /* optional param's follow */
  173 }         SCTP_PACKED;
  174 
  175 #define SCTP_IDENTIFICATION_SIZE 16
  176 #define SCTP_ADDRESS_SIZE 4
  177 #define SCTP_RESERVE_SPACE 6
  178 /* state cookie header */
  179 struct sctp_state_cookie {      /* this is our definition... */
  180         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  181         struct timeval time_entered;    /* the time I built cookie */
  182         uint32_t cookie_life;   /* life I will award this cookie */
  183         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  184 
  185         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  186         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  187 
  188         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  189         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  190         uint32_t addr_type;     /* address type */
  191         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  192         uint32_t laddr_type;    /* my local from address type */
  193         uint32_t scope_id;      /* v6 scope id for link-locals */
  194 
  195         uint16_t peerport;      /* port address of the peer in the INIT */
  196         uint16_t myport;        /* my port address used in the INIT */
  197         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  198         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  199         uint8_t local_scope;    /* IPv6 local scope flag */
  200         uint8_t site_scope;     /* IPv6 site scope flag */
  201 
  202         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  203         uint8_t loopback_scope; /* loopback scope information */
  204         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  205         /*
  206          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  207          * (minus the cookie).
  208          */
  209 }                 SCTP_PACKED;
  210 
  211 
  212 /* Used for NAT state error cause */
  213 struct sctp_missing_nat_state {
  214         uint16_t cause;
  215         uint16_t length;
  216         uint8_t data[];
  217 }                      SCTP_PACKED;
  218 
  219 
  220 struct sctp_inv_mandatory_param {
  221         uint16_t cause;
  222         uint16_t length;
  223         uint32_t num_param;
  224         uint16_t param;
  225         /*
  226          * We include this to 0 it since only a missing cookie will cause
  227          * this error.
  228          */
  229         uint16_t resv;
  230 }                        SCTP_PACKED;
  231 
  232 struct sctp_unresolv_addr {
  233         uint16_t cause;
  234         uint16_t length;
  235         uint16_t addr_type;
  236         uint16_t reserved;      /* Only one invalid addr type */
  237 }                  SCTP_PACKED;
  238 
  239 /* state cookie parameter */
  240 struct sctp_state_cookie_param {
  241         struct sctp_paramhdr ph;
  242         struct sctp_state_cookie cookie;
  243 }                       SCTP_PACKED;
  244 
  245 struct sctp_init_chunk {
  246         struct sctp_chunkhdr ch;
  247         struct sctp_init init;
  248 }               SCTP_PACKED;
  249 
  250 struct sctp_init_msg {
  251         struct sctphdr sh;
  252         struct sctp_init_chunk msg;
  253 }             SCTP_PACKED;
  254 
  255 /* ... used for both INIT and INIT ACK */
  256 #define sctp_init_ack           sctp_init
  257 #define sctp_init_ack_chunk     sctp_init_chunk
  258 #define sctp_init_ack_msg       sctp_init_msg
  259 
  260 
  261 /* Selective Ack (SACK) */
  262 struct sctp_gap_ack_block {
  263         uint16_t start;         /* Gap Ack block start */
  264         uint16_t end;           /* Gap Ack block end */
  265 }                  SCTP_PACKED;
  266 
  267 struct sctp_sack {
  268         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  269         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  270         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  271         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  272         /* struct sctp_gap_ack_block's follow */
  273         /* uint32_t duplicate_tsn's follow */
  274 }         SCTP_PACKED;
  275 
  276 struct sctp_sack_chunk {
  277         struct sctp_chunkhdr ch;
  278         struct sctp_sack sack;
  279 }               SCTP_PACKED;
  280 
  281 struct sctp_nr_sack {
  282         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  283         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  284         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  285         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  286         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  287         uint16_t reserved;      /* not currently used */
  288         /* struct sctp_gap_ack_block's follow */
  289         /* uint32_t duplicate_tsn's follow */
  290 }            SCTP_PACKED;
  291 
  292 struct sctp_nr_sack_chunk {
  293         struct sctp_chunkhdr ch;
  294         struct sctp_nr_sack nr_sack;
  295 }                  SCTP_PACKED;
  296 
  297 
  298 /* Heartbeat Request (HEARTBEAT) */
  299 struct sctp_heartbeat {
  300         struct sctp_heartbeat_info_param hb_info;
  301 }              SCTP_PACKED;
  302 
  303 struct sctp_heartbeat_chunk {
  304         struct sctp_chunkhdr ch;
  305         struct sctp_heartbeat heartbeat;
  306 }                    SCTP_PACKED;
  307 
  308 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  309 #define sctp_heartbeat_ack              sctp_heartbeat
  310 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  311 
  312 
  313 /* Abort Asssociation (ABORT) */
  314 struct sctp_abort_chunk {
  315         struct sctp_chunkhdr ch;
  316         /* optional error cause may follow */
  317 }                SCTP_PACKED;
  318 
  319 struct sctp_abort_msg {
  320         struct sctphdr sh;
  321         struct sctp_abort_chunk msg;
  322 }              SCTP_PACKED;
  323 
  324 
  325 /* Shutdown Association (SHUTDOWN) */
  326 struct sctp_shutdown_chunk {
  327         struct sctp_chunkhdr ch;
  328         uint32_t cumulative_tsn_ack;
  329 }                   SCTP_PACKED;
  330 
  331 
  332 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  333 struct sctp_shutdown_ack_chunk {
  334         struct sctp_chunkhdr ch;
  335 }                       SCTP_PACKED;
  336 
  337 
  338 /* Operation Error (ERROR) */
  339 struct sctp_error_chunk {
  340         struct sctp_chunkhdr ch;
  341         /* optional error causes follow */
  342 }                SCTP_PACKED;
  343 
  344 
  345 /* Cookie Echo (COOKIE ECHO) */
  346 struct sctp_cookie_echo_chunk {
  347         struct sctp_chunkhdr ch;
  348         struct sctp_state_cookie cookie;
  349 }                      SCTP_PACKED;
  350 
  351 /* Cookie Acknowledgment (COOKIE ACK) */
  352 struct sctp_cookie_ack_chunk {
  353         struct sctp_chunkhdr ch;
  354 }                     SCTP_PACKED;
  355 
  356 /* Explicit Congestion Notification Echo (ECNE) */
  357 struct old_sctp_ecne_chunk {
  358         struct sctp_chunkhdr ch;
  359         uint32_t tsn;
  360 }                   SCTP_PACKED;
  361 
  362 struct sctp_ecne_chunk {
  363         struct sctp_chunkhdr ch;
  364         uint32_t tsn;
  365         uint32_t num_pkts_since_cwr;
  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_RESULT_NOTHING_TO_DO   0x00000000     /* XXX: unused */
  501 #define SCTP_STREAM_RESET_RESULT_PERFORMED       0x00000001
  502 #define SCTP_STREAM_RESET_RESULT_DENIED          0x00000002
  503 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN  0x00000003     /* XXX: unused */
  504 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
  505 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO   0x00000005
  506 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS     0x00000006     /* XXX: unused */
  507 
  508 /*
  509  * convience structures, note that if you are making a request for specific
  510  * streams then the request will need to be an overlay structure.
  511  */
  512 
  513 struct sctp_stream_reset_tsn_req {
  514         struct sctp_chunkhdr ch;
  515         struct sctp_stream_reset_tsn_request sr_req;
  516 }                         SCTP_PACKED;
  517 
  518 struct sctp_stream_reset_resp {
  519         struct sctp_chunkhdr ch;
  520         struct sctp_stream_reset_response sr_resp;
  521 }                      SCTP_PACKED;
  522 
  523 /* respone only valid with a TSN request */
  524 struct sctp_stream_reset_resp_tsn {
  525         struct sctp_chunkhdr ch;
  526         struct sctp_stream_reset_response_tsn sr_resp;
  527 }                          SCTP_PACKED;
  528 
  529 /****************************************************/
  530 
  531 /*
  532  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  533  */
  534 
  535 /* Should we make the max be 32? */
  536 #define SCTP_RANDOM_MAX_SIZE 256
  537 struct sctp_auth_random {
  538         struct sctp_paramhdr ph;/* type = 0x8002 */
  539         uint8_t random_data[];
  540 }                SCTP_PACKED;
  541 
  542 struct sctp_auth_chunk_list {
  543         struct sctp_paramhdr ph;/* type = 0x8003 */
  544         uint8_t chunk_types[];
  545 }                    SCTP_PACKED;
  546 
  547 struct sctp_auth_hmac_algo {
  548         struct sctp_paramhdr ph;/* type = 0x8004 */
  549         uint16_t hmac_ids[];
  550 }                   SCTP_PACKED;
  551 
  552 struct sctp_auth_chunk {
  553         struct sctp_chunkhdr ch;
  554         uint16_t shared_key_id;
  555         uint16_t hmac_id;
  556         uint8_t hmac[];
  557 }               SCTP_PACKED;
  558 
  559 struct sctp_auth_invalid_hmac {
  560         struct sctp_paramhdr ph;
  561         uint16_t hmac_id;
  562         uint16_t padding;
  563 }                      SCTP_PACKED;
  564 
  565 /*
  566  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  567  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  568  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  569  * data chunk I will split into. We could increase throughput slightly by
  570  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  571  * feel is worth it for now.
  572  */
  573 #ifndef SCTP_MAX_OVERHEAD
  574 #ifdef INET6
  575 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  576                            sizeof(struct sctphdr) + \
  577                            sizeof(struct sctp_ecne_chunk) + \
  578                            sizeof(struct sctp_sack_chunk) + \
  579                            sizeof(struct ip6_hdr))
  580 
  581 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  582                            sizeof(struct sctphdr) + \
  583                            sizeof(struct ip6_hdr))
  584 
  585 
  586 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  587                            sizeof(struct sctphdr))
  588 
  589 #else
  590 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  591                            sizeof(struct sctphdr) + \
  592                            sizeof(struct sctp_ecne_chunk) + \
  593                            sizeof(struct sctp_sack_chunk) + \
  594                            sizeof(struct ip))
  595 
  596 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  597                            sizeof(struct sctphdr) + \
  598                            sizeof(struct ip))
  599 
  600 
  601 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  602                            sizeof(struct sctphdr))
  603 
  604 #endif                          /* INET6 */
  605 #endif                          /* !SCTP_MAX_OVERHEAD */
  606 
  607 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  608                               sizeof(struct sctphdr) + \
  609                               sizeof(struct ip))
  610 
  611 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  612                               sizeof(struct sctphdr))
  613 
  614 #undef SCTP_PACKED
  615 #endif                          /* !__sctp_header_h__ */

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