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/11.2/sys/netinet/sctp_header.h 331722 2018-03-29 02:50:57Z eadler $");
   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 /* heartbeat info parameter */
   86 struct sctp_heartbeat_info_param {
   87         struct sctp_paramhdr ph;
   88         uint32_t time_value_1;
   89         uint32_t time_value_2;
   90         uint32_t random_value1;
   91         uint32_t random_value2;
   92         uint8_t addr_family;
   93         uint8_t addr_len;
   94         /* make sure that this structure is 4 byte aligned */
   95         uint8_t padding[2];
   96         char address[SCTP_ADDRMAX];
   97 }                         SCTP_PACKED;
   98 
   99 
  100 /* draft-ietf-tsvwg-prsctp */
  101 /* PR-SCTP supported parameter */
  102 struct sctp_prsctp_supported_param {
  103         struct sctp_paramhdr ph;
  104 }                           SCTP_PACKED;
  105 
  106 
  107 /* draft-ietf-tsvwg-addip-sctp */
  108 struct sctp_asconf_paramhdr {   /* an ASCONF "parameter" */
  109         struct sctp_paramhdr ph;/* a SCTP parameter header */
  110         uint32_t correlation_id;/* correlation id for this param */
  111 }                    SCTP_PACKED;
  112 
  113 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
  114         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  115         struct sctp_ipv6addr_param addrp;       /* max storage size */
  116 }                      SCTP_PACKED;
  117 
  118 
  119 struct sctp_asconf_tag_param {  /* an ASCONF NAT-Vtag parameter */
  120         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  121         uint32_t local_vtag;
  122         uint32_t remote_vtag;
  123 }                     SCTP_PACKED;
  124 
  125 
  126 struct sctp_asconf_addrv4_param {       /* an ASCONF address (v4) parameter */
  127         struct sctp_asconf_paramhdr aph;        /* asconf "parameter" */
  128         struct sctp_ipv4addr_param addrp;       /* max storage size */
  129 }                        SCTP_PACKED;
  130 
  131 #define SCTP_MAX_SUPPORTED_EXT 256
  132 
  133 struct sctp_supported_chunk_types_param {
  134         struct sctp_paramhdr ph;/* type = 0x8008  len = x */
  135         uint8_t chunk_types[];
  136 }                                SCTP_PACKED;
  137 
  138 
  139 /*
  140  * Structures for DATA chunks
  141  */
  142 struct sctp_data {
  143         uint32_t tsn;
  144         uint16_t sid;
  145         uint16_t ssn;
  146         uint32_t ppid;
  147         /* user data follows */
  148 }         SCTP_PACKED;
  149 
  150 struct sctp_data_chunk {
  151         struct sctp_chunkhdr ch;
  152         struct sctp_data dp;
  153 }               SCTP_PACKED;
  154 
  155 struct sctp_idata {
  156         uint32_t tsn;
  157         uint16_t sid;
  158         uint16_t reserved;      /* Where does the SSN go? */
  159         uint32_t mid;
  160         union {
  161                 uint32_t ppid;
  162                 uint32_t fsn;   /* Fragment Sequence Number */
  163         }     ppid_fsn;
  164         /* user data follows */
  165 }          SCTP_PACKED;
  166 
  167 struct sctp_idata_chunk {
  168         struct sctp_chunkhdr ch;
  169         struct sctp_idata dp;
  170 }                SCTP_PACKED;
  171 
  172 /*
  173  * Structures for the control chunks
  174  */
  175 
  176 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
  177 struct sctp_init {
  178         uint32_t initiate_tag;  /* initiate tag */
  179         uint32_t a_rwnd;        /* a_rwnd */
  180         uint16_t num_outbound_streams;  /* OS */
  181         uint16_t num_inbound_streams;   /* MIS */
  182         uint32_t initial_tsn;   /* I-TSN */
  183         /* optional param's follow */
  184 }         SCTP_PACKED;
  185 #define SCTP_IDENTIFICATION_SIZE 16
  186 #define SCTP_ADDRESS_SIZE 4
  187 #define SCTP_RESERVE_SPACE 6
  188 /* state cookie header */
  189 struct sctp_state_cookie {      /* this is our definition... */
  190         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  191         struct timeval time_entered;    /* the time I built cookie */
  192         uint32_t cookie_life;   /* life I will award this cookie */
  193         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  194 
  195         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  196         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  197 
  198         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  199         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  200         uint32_t addr_type;     /* address type */
  201         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  202         uint32_t laddr_type;    /* my local from address type */
  203         uint32_t scope_id;      /* v6 scope id for link-locals */
  204 
  205         uint16_t peerport;      /* port address of the peer in the INIT */
  206         uint16_t myport;        /* my port address used in the INIT */
  207         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  208         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  209         uint8_t local_scope;    /* IPv6 local scope flag */
  210         uint8_t site_scope;     /* IPv6 site scope flag */
  211 
  212         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  213         uint8_t loopback_scope; /* loopback scope information */
  214         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  215         /*
  216          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  217          * (minus the cookie).
  218          */
  219 }                 SCTP_PACKED;
  220 
  221 /* state cookie parameter */
  222 struct sctp_state_cookie_param {
  223         struct sctp_paramhdr ph;
  224         struct sctp_state_cookie cookie;
  225 }                       SCTP_PACKED;
  226 
  227 struct sctp_init_chunk {
  228         struct sctp_chunkhdr ch;
  229         struct sctp_init init;
  230 }               SCTP_PACKED;
  231 
  232 struct sctp_init_msg {
  233         struct sctphdr sh;
  234         struct sctp_init_chunk msg;
  235 }             SCTP_PACKED;
  236 
  237 /* ... used for both INIT and INIT ACK */
  238 #define sctp_init_ack           sctp_init
  239 #define sctp_init_ack_chunk     sctp_init_chunk
  240 #define sctp_init_ack_msg       sctp_init_msg
  241 
  242 
  243 /* Selective Ack (SACK) */
  244 struct sctp_gap_ack_block {
  245         uint16_t start;         /* Gap Ack block start */
  246         uint16_t end;           /* Gap Ack block end */
  247 }                  SCTP_PACKED;
  248 
  249 struct sctp_sack {
  250         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  251         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  252         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  253         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  254         /* struct sctp_gap_ack_block's follow */
  255         /* uint32_t duplicate_tsn's follow */
  256 }         SCTP_PACKED;
  257 
  258 struct sctp_sack_chunk {
  259         struct sctp_chunkhdr ch;
  260         struct sctp_sack sack;
  261 }               SCTP_PACKED;
  262 
  263 struct sctp_nr_sack {
  264         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  265         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  266         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  267         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  268         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  269         uint16_t reserved;      /* not currently used */
  270         /* struct sctp_gap_ack_block's follow */
  271         /* uint32_t duplicate_tsn's follow */
  272 }            SCTP_PACKED;
  273 
  274 struct sctp_nr_sack_chunk {
  275         struct sctp_chunkhdr ch;
  276         struct sctp_nr_sack nr_sack;
  277 }                  SCTP_PACKED;
  278 
  279 
  280 /* Heartbeat Request (HEARTBEAT) */
  281 struct sctp_heartbeat {
  282         struct sctp_heartbeat_info_param hb_info;
  283 }              SCTP_PACKED;
  284 
  285 struct sctp_heartbeat_chunk {
  286         struct sctp_chunkhdr ch;
  287         struct sctp_heartbeat heartbeat;
  288 }                    SCTP_PACKED;
  289 
  290 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  291 #define sctp_heartbeat_ack              sctp_heartbeat
  292 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  293 
  294 
  295 /* Abort Asssociation (ABORT) */
  296 struct sctp_abort_chunk {
  297         struct sctp_chunkhdr ch;
  298         /* optional error cause may follow */
  299 }                SCTP_PACKED;
  300 
  301 struct sctp_abort_msg {
  302         struct sctphdr sh;
  303         struct sctp_abort_chunk msg;
  304 }              SCTP_PACKED;
  305 
  306 
  307 /* Shutdown Association (SHUTDOWN) */
  308 struct sctp_shutdown_chunk {
  309         struct sctp_chunkhdr ch;
  310         uint32_t cumulative_tsn_ack;
  311 }                   SCTP_PACKED;
  312 
  313 
  314 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  315 struct sctp_shutdown_ack_chunk {
  316         struct sctp_chunkhdr ch;
  317 }                       SCTP_PACKED;
  318 
  319 
  320 /* Operation Error (ERROR) */
  321 struct sctp_error_chunk {
  322         struct sctp_chunkhdr ch;
  323         /* optional error causes follow */
  324 }                SCTP_PACKED;
  325 
  326 
  327 /* Cookie Echo (COOKIE ECHO) */
  328 struct sctp_cookie_echo_chunk {
  329         struct sctp_chunkhdr ch;
  330         struct sctp_state_cookie cookie;
  331 }                      SCTP_PACKED;
  332 
  333 /* Cookie Acknowledgment (COOKIE ACK) */
  334 struct sctp_cookie_ack_chunk {
  335         struct sctp_chunkhdr ch;
  336 }                     SCTP_PACKED;
  337 
  338 /* Explicit Congestion Notification Echo (ECNE) */
  339 struct old_sctp_ecne_chunk {
  340         struct sctp_chunkhdr ch;
  341         uint32_t tsn;
  342 }                   SCTP_PACKED;
  343 
  344 struct sctp_ecne_chunk {
  345         struct sctp_chunkhdr ch;
  346         uint32_t tsn;
  347         uint32_t num_pkts_since_cwr;
  348 }               SCTP_PACKED;
  349 
  350 /* Congestion Window Reduced (CWR) */
  351 struct sctp_cwr_chunk {
  352         struct sctp_chunkhdr ch;
  353         uint32_t tsn;
  354 }              SCTP_PACKED;
  355 
  356 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  357 struct sctp_shutdown_complete_chunk {
  358         struct sctp_chunkhdr ch;
  359 }                            SCTP_PACKED;
  360 
  361 struct sctp_adaptation_layer_indication {
  362         struct sctp_paramhdr ph;
  363         uint32_t indication;
  364 }                                SCTP_PACKED;
  365 
  366 /*
  367  * draft-ietf-tsvwg-addip-sctp
  368  */
  369 /* Address/Stream Configuration Change (ASCONF) */
  370 struct sctp_asconf_chunk {
  371         struct sctp_chunkhdr ch;
  372         uint32_t serial_number;
  373         /* lookup address parameter (mandatory) */
  374         /* asconf parameters follow */
  375 }                 SCTP_PACKED;
  376 
  377 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  378 struct sctp_asconf_ack_chunk {
  379         struct sctp_chunkhdr ch;
  380         uint32_t serial_number;
  381         /* asconf parameters follow */
  382 }                     SCTP_PACKED;
  383 
  384 /* draft-ietf-tsvwg-prsctp */
  385 /* Forward Cumulative TSN (FORWARD TSN) */
  386 struct sctp_forward_tsn_chunk {
  387         struct sctp_chunkhdr ch;
  388         uint32_t new_cumulative_tsn;
  389         /* stream/sequence pairs (sctp_strseq) follow */
  390 }                      SCTP_PACKED;
  391 
  392 struct sctp_strseq {
  393         uint16_t sid;
  394         uint16_t ssn;
  395 }           SCTP_PACKED;
  396 
  397 struct sctp_strseq_mid {
  398         uint16_t sid;
  399         uint16_t flags;
  400         uint32_t mid;
  401 };
  402 
  403 struct sctp_forward_tsn_msg {
  404         struct sctphdr sh;
  405         struct sctp_forward_tsn_chunk msg;
  406 }                    SCTP_PACKED;
  407 
  408 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  409 
  410 #define SCTP_NUM_DB_TO_VERIFY 31
  411 
  412 struct sctp_chunk_desc {
  413         uint8_t chunk_type;
  414         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  415         uint32_t tsn_ifany;
  416 }               SCTP_PACKED;
  417 
  418 
  419 struct sctp_pktdrop_chunk {
  420         struct sctp_chunkhdr ch;
  421         uint32_t bottle_bw;
  422         uint32_t current_onq;
  423         uint16_t trunc_len;
  424         uint16_t reserved;
  425         uint8_t data[];
  426 }                  SCTP_PACKED;
  427 
  428 /**********STREAM RESET STUFF ******************/
  429 
  430 struct sctp_stream_reset_request {
  431         struct sctp_paramhdr ph;
  432         uint32_t request_seq;
  433 }                         SCTP_PACKED;
  434 
  435 struct sctp_stream_reset_out_request {
  436         struct sctp_paramhdr ph;
  437         uint32_t request_seq;   /* monotonically increasing seq no */
  438         uint32_t response_seq;  /* if a response, the resp seq no */
  439         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  440         uint16_t list_of_streams[];     /* if not all list of streams */
  441 }                             SCTP_PACKED;
  442 
  443 struct sctp_stream_reset_in_request {
  444         struct sctp_paramhdr ph;
  445         uint32_t request_seq;
  446         uint16_t list_of_streams[];     /* if not all list of streams */
  447 }                            SCTP_PACKED;
  448 
  449 struct sctp_stream_reset_tsn_request {
  450         struct sctp_paramhdr ph;
  451         uint32_t request_seq;
  452 }                             SCTP_PACKED;
  453 
  454 struct sctp_stream_reset_response {
  455         struct sctp_paramhdr ph;
  456         uint32_t response_seq;  /* if a response, the resp seq no */
  457         uint32_t result;
  458 }                          SCTP_PACKED;
  459 
  460 struct sctp_stream_reset_response_tsn {
  461         struct sctp_paramhdr ph;
  462         uint32_t response_seq;  /* if a response, the resp seq no */
  463         uint32_t result;
  464         uint32_t senders_next_tsn;
  465         uint32_t receivers_next_tsn;
  466 }                              SCTP_PACKED;
  467 
  468 struct sctp_stream_reset_add_strm {
  469         struct sctp_paramhdr ph;
  470         uint32_t request_seq;
  471         uint16_t number_of_streams;
  472         uint16_t reserved;
  473 }                          SCTP_PACKED;
  474 
  475 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO   0x00000000     /* XXX: unused */
  476 #define SCTP_STREAM_RESET_RESULT_PERFORMED       0x00000001
  477 #define SCTP_STREAM_RESET_RESULT_DENIED          0x00000002
  478 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN  0x00000003     /* XXX: unused */
  479 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
  480 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO   0x00000005
  481 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS     0x00000006     /* XXX: unused */
  482 
  483 /*
  484  * convience structures, note that if you are making a request for specific
  485  * streams then the request will need to be an overlay structure.
  486  */
  487 
  488 struct sctp_stream_reset_tsn_req {
  489         struct sctp_chunkhdr ch;
  490         struct sctp_stream_reset_tsn_request sr_req;
  491 }                         SCTP_PACKED;
  492 
  493 struct sctp_stream_reset_resp {
  494         struct sctp_chunkhdr ch;
  495         struct sctp_stream_reset_response sr_resp;
  496 }                      SCTP_PACKED;
  497 
  498 /* respone only valid with a TSN request */
  499 struct sctp_stream_reset_resp_tsn {
  500         struct sctp_chunkhdr ch;
  501         struct sctp_stream_reset_response_tsn sr_resp;
  502 }                          SCTP_PACKED;
  503 
  504 /****************************************************/
  505 
  506 /*
  507  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  508  */
  509 
  510 /* Should we make the max be 32? */
  511 #define SCTP_RANDOM_MAX_SIZE 256
  512 struct sctp_auth_random {
  513         struct sctp_paramhdr ph;/* type = 0x8002 */
  514         uint8_t random_data[];
  515 }                SCTP_PACKED;
  516 
  517 struct sctp_auth_chunk_list {
  518         struct sctp_paramhdr ph;/* type = 0x8003 */
  519         uint8_t chunk_types[];
  520 }                    SCTP_PACKED;
  521 
  522 struct sctp_auth_hmac_algo {
  523         struct sctp_paramhdr ph;/* type = 0x8004 */
  524         uint16_t hmac_ids[];
  525 }                   SCTP_PACKED;
  526 
  527 struct sctp_auth_chunk {
  528         struct sctp_chunkhdr ch;
  529         uint16_t shared_key_id;
  530         uint16_t hmac_id;
  531         uint8_t hmac[];
  532 }               SCTP_PACKED;
  533 
  534 /*
  535  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  536  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  537  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  538  * data chunk I will split into. We could increase throughput slightly by
  539  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  540  * feel is worth it for now.
  541  */
  542 #ifndef SCTP_MAX_OVERHEAD
  543 #ifdef INET6
  544 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  545                            sizeof(struct sctphdr) + \
  546                            sizeof(struct sctp_ecne_chunk) + \
  547                            sizeof(struct sctp_sack_chunk) + \
  548                            sizeof(struct ip6_hdr))
  549 
  550 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  551                            sizeof(struct sctphdr) + \
  552                            sizeof(struct ip6_hdr))
  553 
  554 
  555 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  556                            sizeof(struct sctphdr))
  557 
  558 #else
  559 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  560                            sizeof(struct sctphdr) + \
  561                            sizeof(struct sctp_ecne_chunk) + \
  562                            sizeof(struct sctp_sack_chunk) + \
  563                            sizeof(struct ip))
  564 
  565 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  566                            sizeof(struct sctphdr) + \
  567                            sizeof(struct ip))
  568 
  569 
  570 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  571                            sizeof(struct sctphdr))
  572 
  573 #endif                          /* INET6 */
  574 #endif                          /* !SCTP_MAX_OVERHEAD */
  575 
  576 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  577                               sizeof(struct sctphdr) + \
  578                               sizeof(struct ip))
  579 
  580 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  581                               sizeof(struct sctphdr))
  582 
  583 #undef SCTP_PACKED
  584 #endif                          /* !__sctp_header_h__ */

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