The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_header.h

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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/11.0/sys/netinet/sctp_header.h 303267 2016-07-24 14:50:16Z 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 /* 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 stream_id;
  145         uint16_t stream_sequence;
  146         uint32_t protocol_id;
  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 stream_id;
  158         uint16_t reserved;      /* Where does the SSN go? */
  159         uint32_t msg_id;
  160         union {
  161                 uint32_t protocol_id;
  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 
  186 #define SCTP_IDENTIFICATION_SIZE 16
  187 #define SCTP_ADDRESS_SIZE 4
  188 #define SCTP_RESERVE_SPACE 6
  189 /* state cookie header */
  190 struct sctp_state_cookie {      /* this is our definition... */
  191         uint8_t identification[SCTP_IDENTIFICATION_SIZE];       /* id of who we are */
  192         struct timeval time_entered;    /* the time I built cookie */
  193         uint32_t cookie_life;   /* life I will award this cookie */
  194         uint32_t tie_tag_my_vtag;       /* my tag in old association */
  195 
  196         uint32_t tie_tag_peer_vtag;     /* peers tag in old association */
  197         uint32_t peers_vtag;    /* peers tag in INIT (for quick ref) */
  198 
  199         uint32_t my_vtag;       /* my tag in INIT-ACK (for quick ref) */
  200         uint32_t address[SCTP_ADDRESS_SIZE];    /* 4 ints/128 bits */
  201         uint32_t addr_type;     /* address type */
  202         uint32_t laddress[SCTP_ADDRESS_SIZE];   /* my local from address */
  203         uint32_t laddr_type;    /* my local from address type */
  204         uint32_t scope_id;      /* v6 scope id for link-locals */
  205 
  206         uint16_t peerport;      /* port address of the peer in the INIT */
  207         uint16_t myport;        /* my port address used in the INIT */
  208         uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
  209         uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
  210         uint8_t local_scope;    /* IPv6 local scope flag */
  211         uint8_t site_scope;     /* IPv6 site scope flag */
  212 
  213         uint8_t ipv4_scope;     /* IPv4 private addr scope */
  214         uint8_t loopback_scope; /* loopback scope information */
  215         uint8_t reserved[SCTP_RESERVE_SPACE];   /* Align to 64 bits */
  216         /*
  217          * at the end is tacked on the INIT chunk and the INIT-ACK chunk
  218          * (minus the cookie).
  219          */
  220 }                 SCTP_PACKED;
  221 
  222 /* state cookie parameter */
  223 struct sctp_state_cookie_param {
  224         struct sctp_paramhdr ph;
  225         struct sctp_state_cookie cookie;
  226 }                       SCTP_PACKED;
  227 
  228 struct sctp_init_chunk {
  229         struct sctp_chunkhdr ch;
  230         struct sctp_init init;
  231 }               SCTP_PACKED;
  232 
  233 struct sctp_init_msg {
  234         struct sctphdr sh;
  235         struct sctp_init_chunk msg;
  236 }             SCTP_PACKED;
  237 
  238 /* ... used for both INIT and INIT ACK */
  239 #define sctp_init_ack           sctp_init
  240 #define sctp_init_ack_chunk     sctp_init_chunk
  241 #define sctp_init_ack_msg       sctp_init_msg
  242 
  243 
  244 /* Selective Ack (SACK) */
  245 struct sctp_gap_ack_block {
  246         uint16_t start;         /* Gap Ack block start */
  247         uint16_t end;           /* Gap Ack block end */
  248 }                  SCTP_PACKED;
  249 
  250 struct sctp_sack {
  251         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  252         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  253         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  254         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  255         /* struct sctp_gap_ack_block's follow */
  256         /* uint32_t duplicate_tsn's follow */
  257 }         SCTP_PACKED;
  258 
  259 struct sctp_sack_chunk {
  260         struct sctp_chunkhdr ch;
  261         struct sctp_sack sack;
  262 }               SCTP_PACKED;
  263 
  264 struct sctp_nr_sack {
  265         uint32_t cum_tsn_ack;   /* cumulative TSN Ack */
  266         uint32_t a_rwnd;        /* updated a_rwnd of sender */
  267         uint16_t num_gap_ack_blks;      /* number of Gap Ack blocks */
  268         uint16_t num_nr_gap_ack_blks;   /* number of NR Gap Ack blocks */
  269         uint16_t num_dup_tsns;  /* number of duplicate TSNs */
  270         uint16_t reserved;      /* not currently used */
  271         /* struct sctp_gap_ack_block's follow */
  272         /* uint32_t duplicate_tsn's follow */
  273 }            SCTP_PACKED;
  274 
  275 struct sctp_nr_sack_chunk {
  276         struct sctp_chunkhdr ch;
  277         struct sctp_nr_sack nr_sack;
  278 }                  SCTP_PACKED;
  279 
  280 
  281 /* Heartbeat Request (HEARTBEAT) */
  282 struct sctp_heartbeat {
  283         struct sctp_heartbeat_info_param hb_info;
  284 }              SCTP_PACKED;
  285 
  286 struct sctp_heartbeat_chunk {
  287         struct sctp_chunkhdr ch;
  288         struct sctp_heartbeat heartbeat;
  289 }                    SCTP_PACKED;
  290 
  291 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
  292 #define sctp_heartbeat_ack              sctp_heartbeat
  293 #define sctp_heartbeat_ack_chunk        sctp_heartbeat_chunk
  294 
  295 
  296 /* Abort Asssociation (ABORT) */
  297 struct sctp_abort_chunk {
  298         struct sctp_chunkhdr ch;
  299         /* optional error cause may follow */
  300 }                SCTP_PACKED;
  301 
  302 struct sctp_abort_msg {
  303         struct sctphdr sh;
  304         struct sctp_abort_chunk msg;
  305 }              SCTP_PACKED;
  306 
  307 
  308 /* Shutdown Association (SHUTDOWN) */
  309 struct sctp_shutdown_chunk {
  310         struct sctp_chunkhdr ch;
  311         uint32_t cumulative_tsn_ack;
  312 }                   SCTP_PACKED;
  313 
  314 
  315 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
  316 struct sctp_shutdown_ack_chunk {
  317         struct sctp_chunkhdr ch;
  318 }                       SCTP_PACKED;
  319 
  320 
  321 /* Operation Error (ERROR) */
  322 struct sctp_error_chunk {
  323         struct sctp_chunkhdr ch;
  324         /* optional error causes follow */
  325 }                SCTP_PACKED;
  326 
  327 
  328 /* Cookie Echo (COOKIE ECHO) */
  329 struct sctp_cookie_echo_chunk {
  330         struct sctp_chunkhdr ch;
  331         struct sctp_state_cookie cookie;
  332 }                      SCTP_PACKED;
  333 
  334 /* Cookie Acknowledgment (COOKIE ACK) */
  335 struct sctp_cookie_ack_chunk {
  336         struct sctp_chunkhdr ch;
  337 }                     SCTP_PACKED;
  338 
  339 /* Explicit Congestion Notification Echo (ECNE) */
  340 struct old_sctp_ecne_chunk {
  341         struct sctp_chunkhdr ch;
  342         uint32_t tsn;
  343 }                   SCTP_PACKED;
  344 
  345 struct sctp_ecne_chunk {
  346         struct sctp_chunkhdr ch;
  347         uint32_t tsn;
  348         uint32_t num_pkts_since_cwr;
  349 }               SCTP_PACKED;
  350 
  351 /* Congestion Window Reduced (CWR) */
  352 struct sctp_cwr_chunk {
  353         struct sctp_chunkhdr ch;
  354         uint32_t tsn;
  355 }              SCTP_PACKED;
  356 
  357 /* Shutdown Complete (SHUTDOWN COMPLETE) */
  358 struct sctp_shutdown_complete_chunk {
  359         struct sctp_chunkhdr ch;
  360 }                            SCTP_PACKED;
  361 
  362 struct sctp_adaptation_layer_indication {
  363         struct sctp_paramhdr ph;
  364         uint32_t indication;
  365 }                                SCTP_PACKED;
  366 
  367 /*
  368  * draft-ietf-tsvwg-addip-sctp
  369  */
  370 /* Address/Stream Configuration Change (ASCONF) */
  371 struct sctp_asconf_chunk {
  372         struct sctp_chunkhdr ch;
  373         uint32_t serial_number;
  374         /* lookup address parameter (mandatory) */
  375         /* asconf parameters follow */
  376 }                 SCTP_PACKED;
  377 
  378 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
  379 struct sctp_asconf_ack_chunk {
  380         struct sctp_chunkhdr ch;
  381         uint32_t serial_number;
  382         /* asconf parameters follow */
  383 }                     SCTP_PACKED;
  384 
  385 /* draft-ietf-tsvwg-prsctp */
  386 /* Forward Cumulative TSN (FORWARD TSN) */
  387 struct sctp_forward_tsn_chunk {
  388         struct sctp_chunkhdr ch;
  389         uint32_t new_cumulative_tsn;
  390         /* stream/sequence pairs (sctp_strseq) follow */
  391 }                      SCTP_PACKED;
  392 
  393 struct sctp_strseq {
  394         uint16_t stream;
  395         uint16_t sequence;
  396 }           SCTP_PACKED;
  397 
  398 struct sctp_strseq_mid {
  399         uint16_t stream;
  400         uint16_t flags;
  401         uint32_t msg_id;
  402 };
  403 
  404 struct sctp_forward_tsn_msg {
  405         struct sctphdr sh;
  406         struct sctp_forward_tsn_chunk msg;
  407 }                    SCTP_PACKED;
  408 
  409 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
  410 
  411 #define SCTP_NUM_DB_TO_VERIFY 31
  412 
  413 struct sctp_chunk_desc {
  414         uint8_t chunk_type;
  415         uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
  416         uint32_t tsn_ifany;
  417 }               SCTP_PACKED;
  418 
  419 
  420 struct sctp_pktdrop_chunk {
  421         struct sctp_chunkhdr ch;
  422         uint32_t bottle_bw;
  423         uint32_t current_onq;
  424         uint16_t trunc_len;
  425         uint16_t reserved;
  426         uint8_t data[];
  427 }                  SCTP_PACKED;
  428 
  429 /**********STREAM RESET STUFF ******************/
  430 
  431 struct sctp_stream_reset_request {
  432         struct sctp_paramhdr ph;
  433         uint32_t request_seq;
  434 }                         SCTP_PACKED;
  435 
  436 struct sctp_stream_reset_out_request {
  437         struct sctp_paramhdr ph;
  438         uint32_t request_seq;   /* monotonically increasing seq no */
  439         uint32_t response_seq;  /* if a response, the resp seq no */
  440         uint32_t send_reset_at_tsn;     /* last TSN I assigned outbound */
  441         uint16_t list_of_streams[];     /* if not all list of streams */
  442 }                             SCTP_PACKED;
  443 
  444 struct sctp_stream_reset_in_request {
  445         struct sctp_paramhdr ph;
  446         uint32_t request_seq;
  447         uint16_t list_of_streams[];     /* if not all list of streams */
  448 }                            SCTP_PACKED;
  449 
  450 struct sctp_stream_reset_tsn_request {
  451         struct sctp_paramhdr ph;
  452         uint32_t request_seq;
  453 }                             SCTP_PACKED;
  454 
  455 struct sctp_stream_reset_response {
  456         struct sctp_paramhdr ph;
  457         uint32_t response_seq;  /* if a response, the resp seq no */
  458         uint32_t result;
  459 }                          SCTP_PACKED;
  460 
  461 struct sctp_stream_reset_response_tsn {
  462         struct sctp_paramhdr ph;
  463         uint32_t response_seq;  /* if a response, the resp seq no */
  464         uint32_t result;
  465         uint32_t senders_next_tsn;
  466         uint32_t receivers_next_tsn;
  467 }                              SCTP_PACKED;
  468 
  469 struct sctp_stream_reset_add_strm {
  470         struct sctp_paramhdr ph;
  471         uint32_t request_seq;
  472         uint16_t number_of_streams;
  473         uint16_t reserved;
  474 }                          SCTP_PACKED;
  475 
  476 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO   0x00000000     /* XXX: unused */
  477 #define SCTP_STREAM_RESET_RESULT_PERFORMED       0x00000001
  478 #define SCTP_STREAM_RESET_RESULT_DENIED          0x00000002
  479 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN  0x00000003     /* XXX: unused */
  480 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
  481 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO   0x00000005
  482 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS     0x00000006     /* XXX: unused */
  483 
  484 /*
  485  * convience structures, note that if you are making a request for specific
  486  * streams then the request will need to be an overlay structure.
  487  */
  488 
  489 struct sctp_stream_reset_tsn_req {
  490         struct sctp_chunkhdr ch;
  491         struct sctp_stream_reset_tsn_request sr_req;
  492 }                         SCTP_PACKED;
  493 
  494 struct sctp_stream_reset_resp {
  495         struct sctp_chunkhdr ch;
  496         struct sctp_stream_reset_response sr_resp;
  497 }                      SCTP_PACKED;
  498 
  499 /* respone only valid with a TSN request */
  500 struct sctp_stream_reset_resp_tsn {
  501         struct sctp_chunkhdr ch;
  502         struct sctp_stream_reset_response_tsn sr_resp;
  503 }                          SCTP_PACKED;
  504 
  505 /****************************************************/
  506 
  507 /*
  508  * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
  509  */
  510 
  511 /* Should we make the max be 32? */
  512 #define SCTP_RANDOM_MAX_SIZE 256
  513 struct sctp_auth_random {
  514         struct sctp_paramhdr ph;/* type = 0x8002 */
  515         uint8_t random_data[];
  516 }                SCTP_PACKED;
  517 
  518 struct sctp_auth_chunk_list {
  519         struct sctp_paramhdr ph;/* type = 0x8003 */
  520         uint8_t chunk_types[];
  521 }                    SCTP_PACKED;
  522 
  523 struct sctp_auth_hmac_algo {
  524         struct sctp_paramhdr ph;/* type = 0x8004 */
  525         uint16_t hmac_ids[];
  526 }                   SCTP_PACKED;
  527 
  528 struct sctp_auth_chunk {
  529         struct sctp_chunkhdr ch;
  530         uint16_t shared_key_id;
  531         uint16_t hmac_id;
  532         uint8_t hmac[];
  533 }               SCTP_PACKED;
  534 
  535 /*
  536  * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
  537  * pieces. If ENCE is missing we could have a couple of blocks. This way we
  538  * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
  539  * data chunk I will split into. We could increase throughput slightly by
  540  * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
  541  * feel is worth it for now.
  542  */
  543 #ifndef SCTP_MAX_OVERHEAD
  544 #ifdef INET6
  545 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  546                            sizeof(struct sctphdr) + \
  547                            sizeof(struct sctp_ecne_chunk) + \
  548                            sizeof(struct sctp_sack_chunk) + \
  549                            sizeof(struct ip6_hdr))
  550 
  551 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  552                            sizeof(struct sctphdr) + \
  553                            sizeof(struct ip6_hdr))
  554 
  555 
  556 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
  557                            sizeof(struct sctphdr))
  558 
  559 #else
  560 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  561                            sizeof(struct sctphdr) + \
  562                            sizeof(struct sctp_ecne_chunk) + \
  563                            sizeof(struct sctp_sack_chunk) + \
  564                            sizeof(struct ip))
  565 
  566 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  567                            sizeof(struct sctphdr) + \
  568                            sizeof(struct ip))
  569 
  570 
  571 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
  572                            sizeof(struct sctphdr))
  573 
  574 #endif                          /* INET6 */
  575 #endif                          /* !SCTP_MAX_OVERHEAD */
  576 
  577 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
  578                               sizeof(struct sctphdr) + \
  579                               sizeof(struct ip))
  580 
  581 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
  582                               sizeof(struct sctphdr))
  583 
  584 #undef SCTP_PACKED
  585 #endif                          /* !__sctp_header_h__ */

Cache object: 050ec7899537c274b67d618ef9ff8bdd


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.