include/net/sctp/user.h

   1 /* SCTP kernel reference Implementation
   2  * (C) Copyright IBM Corp. 2001, 2004
   3  * Copyright (c) 1999-2000 Cisco, Inc.
   4  * Copyright (c) 1999-2001 Motorola, Inc.
   5  * Copyright (c) 2002 Intel Corp.
   6  *
   7  * This file is part of the SCTP kernel reference Implementation
   8  *
   9  * This header represents the structures and constants needed to support
  10  * the SCTP Extension to the Sockets API.
  11  *
  12  * The SCTP reference implementation is free software;
  13  * you can redistribute it and/or modify it under the terms of
  14  * the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * The SCTP reference implementation is distributed in the hope that it
  19  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  20  *                 ************************
  21  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  22  * See the GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with GNU CC; see the file COPYING.  If not, write to
  26  * the Free Software Foundation, 59 Temple Place - Suite 330,
  27  * Boston, MA 02111-1307, USA.
  28  *
  29  * Please send any bug reports or fixes you make to the
  30  * email address(es):
  31  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  32  *
  33  * Or submit a bug report through the following website:
  34  *    http://www.sf.net/projects/lksctp
  35  *
  36  * Written or modified by:
  37  *    La Monte H.P. Yarroll    <piggy@acm.org>
  38  *    R. Stewart               <randall@sctp.chicago.il.us>
  39  *    K. Morneau               <kmorneau@cisco.com>
  40  *    Q. Xie                   <qxie1@email.mot.com>
  41  *    Karl Knutson             <karl@athena.chicago.il.us>
  42  *    Jon Grimm                <jgrimm@us.ibm.com>
  43  *    Daisy Chang              <daisyc@us.ibm.com>
  44  *    Ryan Layer               <rmlayer@us.ibm.com>
  45  *    Ardelle Fan              <ardelle.fan@intel.com>
  46  *    Sridhar Samudrala        <sri@us.ibm.com>
  47  *
  48  * Any bugs reported given to us we will try to fix... any fixes shared will
  49  * be incorporated into the next SCTP release.
  50  */
  51
  52 #ifndef __net_sctp_user_h__
  53 #define __net_sctp_user_h__
  54
  55 #include <linux/types.h>
  56 #include <linux/socket.h>
  57
  58 typedef __s32 sctp_assoc_t;
  59
  60 /* The following symbols come from the Sockets API Extensions for
  61  * SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
  62  */
  63 enum sctp_optname {
  64         SCTP_RTOINFO,
  65 #define SCTP_RTOINFO SCTP_RTOINFO
  66         SCTP_ASSOCINFO,
  67 #define SCTP_ASSOCINFO SCTP_ASSOCINFO
  68         SCTP_INITMSG,
  69 #define SCTP_INITMSG SCTP_INITMSG
  70         SCTP_NODELAY,   /* Get/set nodelay option. */
  71 #define SCTP_NODELAY    SCTP_NODELAY
  72         SCTP_AUTOCLOSE,
  73 #define SCTP_AUTOCLOSE SCTP_AUTOCLOSE
  74         SCTP_SET_PEER_PRIMARY_ADDR,
  75 #define SCTP_SET_PEER_PRIMARY_ADDR SCTP_SET_PEER_PRIMARY_ADDR
  76         SCTP_PRIMARY_ADDR,
  77 #define SCTP_PRIMARY_ADDR SCTP_PRIMARY_ADDR
  78         SCTP_ADAPTION_LAYER,
  79 #define SCTP_ADAPTION_LAYER SCTP_ADAPTION_LAYER
  80         SCTP_DISABLE_FRAGMENTS,
  81 #define SCTP_DISABLE_FRAGMENTS SCTP_DISABLE_FRAGMENTS
  82         SCTP_PEER_ADDR_PARAMS,
  83 #define SCTP_PEER_ADDR_PARAMS SCTP_PEER_ADDR_PARAMS
  84         SCTP_DEFAULT_SEND_PARAM,
  85 #define SCTP_DEFAULT_SEND_PARAM SCTP_DEFAULT_SEND_PARAM
  86         SCTP_EVENTS,
  87 #define SCTP_EVENTS SCTP_EVENTS
  88         SCTP_I_WANT_MAPPED_V4_ADDR,  /* Turn on/off mapped v4 addresses  */
  89 #define SCTP_I_WANT_MAPPED_V4_ADDR SCTP_I_WANT_MAPPED_V4_ADDR
  90         SCTP_MAXSEG,    /* Get/set maximum fragment. */
  91 #define SCTP_MAXSEG     SCTP_MAXSEG
  92         SCTP_STATUS,
  93 #define SCTP_STATUS SCTP_STATUS
  94         SCTP_GET_PEER_ADDR_INFO,
  95 #define SCTP_GET_PEER_ADDR_INFO SCTP_GET_PEER_ADDR_INFO
  96
  97         /* Internal Socket Options. Some of the sctp library functions are
  98          * implemented using these socket options.
  99          */
 100         SCTP_SOCKOPT_BINDX_ADD = 100,/* BINDX requests for adding addresses. */
 101 #define SCTP_SOCKOPT_BINDX_ADD  SCTP_SOCKOPT_BINDX_ADD
 102         SCTP_SOCKOPT_BINDX_REM, /* BINDX requests for removing addresses. */
 103 #define SCTP_SOCKOPT_BINDX_REM  SCTP_SOCKOPT_BINDX_REM
 104         SCTP_SOCKOPT_PEELOFF,   /* peel off association. */
 105 #define SCTP_SOCKOPT_PEELOFF    SCTP_SOCKOPT_PEELOFF
 106         SCTP_GET_PEER_ADDRS_NUM,        /* Get number of peer addresss. */
 107 #define SCTP_GET_PEER_ADDRS_NUM SCTP_GET_PEER_ADDRS_NUM
 108         SCTP_GET_PEER_ADDRS,    /* Get all peer addresss. */
 109 #define SCTP_GET_PEER_ADDRS     SCTP_GET_PEER_ADDRS
 110         SCTP_GET_LOCAL_ADDRS_NUM,       /* Get number of local addresss. */
 111 #define SCTP_GET_LOCAL_ADDRS_NUM        SCTP_GET_LOCAL_ADDRS_NUM
 112         SCTP_GET_LOCAL_ADDRS,   /* Get all local addresss. */
 113 #define SCTP_GET_LOCAL_ADDRS    SCTP_GET_LOCAL_ADDRS
 114 };
 115
 116 /*
 117  * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
 118  *
 119  *   This cmsghdr structure provides information for initializing new
 120  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 121  *   uses this same data structure.  This structure is not used for
 122  *   recvmsg().
 123  *
 124  *   cmsg_level    cmsg_type      cmsg_data[]
 125  *   ------------  ------------   ----------------------
 126  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 127  *
 128  */
 129 struct sctp_initmsg {
 130         __u16 sinit_num_ostreams;
 131         __u16 sinit_max_instreams;
 132         __u16 sinit_max_attempts;
 133         __u16 sinit_max_init_timeo;
 134 };
 135
 136 /*
 137  * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 138  *
 139  *   This cmsghdr structure specifies SCTP options for sendmsg() and
 140  *   describes SCTP header information about a received message through
 141  *   recvmsg().
 142  *
 143  *   cmsg_level    cmsg_type      cmsg_data[]
 144  *   ------------  ------------   ----------------------
 145  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 146  *
 147  */
 148 struct sctp_sndrcvinfo {
 149         __u16 sinfo_stream;
 150         __u16 sinfo_ssn;
 151         __u16 sinfo_flags;
 152         __u32 sinfo_ppid;
 153         __u32 sinfo_context;
 154         __u32 sinfo_timetolive;
 155         __u32 sinfo_tsn;
 156         __u32 sinfo_cumtsn;
 157         sctp_assoc_t sinfo_assoc_id;
 158 };
 159
 160 /*
 161  *  sinfo_flags: 16 bits (unsigned integer)
 162  *
 163  *   This field may contain any of the following flags and is composed of
 164  *   a bitwise OR of these values.
 165  */
 166
 167 enum sctp_sinfo_flags {
 168         MSG_UNORDERED = 1,  /* Send/receive message unordered. */
 169         MSG_ADDR_OVER = 2,  /* Override the primary destination. */
 170         MSG_ABORT=4,        /* Send an ABORT message to the peer. */
 171         /* MSG_EOF is already defined per socket.h */
 172 };
 173
 174
 175 typedef union {
 176         __u8                    raw;
 177         struct sctp_initmsg     init;
 178         struct sctp_sndrcvinfo  sndrcv;
 179 } sctp_cmsg_data_t;
 180
 181 /* These are cmsg_types.  */
 182 typedef enum sctp_cmsg_type {
 183         SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
 184         SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
 185 } sctp_cmsg_t;
 186
 187
 188 /*
 189  * 5.3.1.1 SCTP_ASSOC_CHANGE
 190  *
 191  *   Communication notifications inform the ULP that an SCTP association
 192  *   has either begun or ended. The identifier for a new association is
 193  *   provided by this notificaion. The notification information has the
 194  *   following format:
 195  *
 196  */
 197 struct sctp_assoc_change {
 198         __u16 sac_type;
 199         __u16 sac_flags;
 200         __u32 sac_length;
 201         __u16 sac_state;
 202         __u16 sac_error;
 203         __u16 sac_outbound_streams;
 204         __u16 sac_inbound_streams;
 205         sctp_assoc_t sac_assoc_id;
 206 };
 207
 208 /*
 209  *   sac_state: 32 bits (signed integer)
 210  *
 211  *   This field holds one of a number of values that communicate the
 212  *   event that happened to the association.  They include:
 213  *
 214  *   Note:  The following state names deviate from the API draft as
 215  *   the names clash too easily with other kernel symbols.
 216  */
 217 enum sctp_sac_state {
 218         SCTP_COMM_UP,
 219         SCTP_COMM_LOST,
 220         SCTP_RESTART,
 221         SCTP_SHUTDOWN_COMP,
 222         SCTP_CANT_STR_ASSOC,
 223 };
 224
 225 /*
 226  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 227  *
 228  *   When a destination address on a multi-homed peer encounters a change
 229  *   an interface details event is sent.  The information has the
 230  *   following structure:
 231  */
 232 struct sctp_paddr_change {
 233         __u16 spc_type;
 234         __u16 spc_flags;
 235         __u32 spc_length;
 236         struct sockaddr_storage spc_aaddr;
 237         int spc_state;
 238         int spc_error;
 239         sctp_assoc_t spc_assoc_id;
 240 };
 241
 242 /*
 243  *    spc_state:  32 bits (signed integer)
 244  *
 245  *   This field holds one of a number of values that communicate the
 246  *   event that happened to the address.  They include:
 247  */
 248 enum sctp_spc_state {
 249         SCTP_ADDR_AVAILABLE,
 250         SCTP_ADDR_UNREACHABLE,
 251         SCTP_ADDR_REMOVED,
 252         SCTP_ADDR_ADDED,
 253         SCTP_ADDR_MADE_PRIM,
 254 };
 255
 256
 257 /*
 258  * 5.3.1.3 SCTP_REMOTE_ERROR
 259  *
 260  *   A remote peer may send an Operational Error message to its peer.
 261  *   This message indicates a variety of error conditions on an
 262  *   association. The entire error TLV as it appears on the wire is
 263  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 264  *   specification [SCTP] and any extensions for a list of possible
 265  *   error formats. SCTP error TLVs have the format:
 266  */
 267 struct sctp_remote_error {
 268         __u16 sre_type;
 269         __u16 sre_flags;
 270         __u32 sre_length;
 271         __u16 sre_error;
 272         sctp_assoc_t sre_assoc_id;
 273         __u8 sre_data[0];
 274 };
 275
 276
 277 /*
 278  * 5.3.1.4 SCTP_SEND_FAILED
 279  *
 280  *   If SCTP cannot deliver a message it may return the message as a
 281  *   notification.
 282  */
 283 struct sctp_send_failed {
 284         __u16 ssf_type;
 285         __u16 ssf_flags;
 286         __u32 ssf_length;
 287         __u32 ssf_error;
 288         struct sctp_sndrcvinfo ssf_info;
 289         sctp_assoc_t ssf_assoc_id;
 290         __u8 ssf_data[0];
 291 };
 292
 293 /*
 294  *   ssf_flags: 16 bits (unsigned integer)
 295  *
 296  *   The flag value will take one of the following values
 297  *
 298  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 299  *                       the wire.
 300  *
 301  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 302  *                       Note that this does not necessarily mean that the
 303  *                       data was (or was not) successfully delivered.
 304  */
 305 enum sctp_ssf_flags {
 306         SCTP_DATA_UNSENT,
 307         SCTP_DATA_SENT,
 308 };
 309
 310 /*
 311  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 312  *
 313  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 314  *   inform the application that it should cease sending data.
 315  */
 316 struct sctp_shutdown_event {
 317         __u16 sse_type;
 318         __u16 sse_flags;
 319         __u32 sse_length;
 320         sctp_assoc_t sse_assoc_id;
 321 };
 322
 323 /*
 324  * 5.3.1.6 SCTP_ADAPTION_INDICATION
 325  *
 326  *   When a peer sends a Adaption Layer Indication parameter , SCTP
 327  *   delivers this notification to inform the application
 328  *   that of the peers requested adaption layer.
 329  */
 330 struct sctp_adaption_event {
 331         __u16 sai_type;
 332         __u16 sai_flags;
 333         __u32 sai_length;
 334         __u32 sai_adaption_ind;
 335         sctp_assoc_t sai_assoc_id;
 336 };
 337
 338 /*
 339  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 340  *
 341  *   When a receiver is engaged in a partial delivery of a
 342  *   message this notification will be used to indicate
 343  *   various events.
 344  */
 345 struct sctp_pdapi_event {
 346         __u16 pdapi_type;
 347         __u16 pdapi_flags;
 348         __u32 pdapi_length;
 349         __u32 pdapi_indication;
 350         sctp_assoc_t pdapi_assoc_id;
 351 };
 352
 353 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 354
 355 /*
 356  * Described in Section 7.3
 357  *   Ancillary Data and Notification Interest Options
 358  */
 359 struct sctp_event_subscribe {
 360         __u8 sctp_data_io_event;
 361         __u8 sctp_association_event;
 362         __u8 sctp_address_event;
 363         __u8 sctp_send_failure_event;
 364         __u8 sctp_peer_error_event;
 365         __u8 sctp_shutdown_event;
 366         __u8 sctp_partial_delivery_event;
 367         __u8 sctp_adaption_layer_event;
 368 };
 369
 370 /*
 371  * 5.3.1 SCTP Notification Structure
 372  *
 373  *   The notification structure is defined as the union of all
 374  *   notification types.
 375  *
 376  */
 377 union sctp_notification {
 378         struct {
 379                 __u16 sn_type;             /* Notification type. */
 380                 __u16 sn_flags;
 381                 __u32 sn_length;
 382         } sn_header;
 383         struct sctp_assoc_change sn_assoc_change;
 384         struct sctp_paddr_change sn_paddr_change;
 385         struct sctp_remote_error sn_remote_error;
 386         struct sctp_send_failed sn_send_failed;
 387         struct sctp_shutdown_event sn_shutdown_event;
 388         struct sctp_adaption_event sn_adaption_event;
 389         struct sctp_pdapi_event sn_pdapi_event;
 390 };
 391
 392 /* Section 5.3.1
 393  * All standard values for sn_type flags are greater than 2^15.
 394  * Values from 2^15 and down are reserved.
 395  */
 396
 397 enum sctp_sn_type {
 398         SCTP_SN_TYPE_BASE     = (1<<15),
 399         SCTP_ASSOC_CHANGE,
 400         SCTP_PEER_ADDR_CHANGE,
 401         SCTP_SEND_FAILED,
 402         SCTP_REMOTE_ERROR,
 403         SCTP_SHUTDOWN_EVENT,
 404         SCTP_PARTIAL_DELIVERY_EVENT,
 405         SCTP_ADAPTION_INDICATION,
 406 };
 407
 408 /* Notification error codes used to fill up the error fields in some
 409  * notifications.
 410  * SCTP_PEER_ADDRESS_CHAGE      : spc_error
 411  * SCTP_ASSOC_CHANGE            : sac_error
 412  * These names should be potentially included in the draft 04 of the SCTP
 413  * sockets API specification.
 414  */
 415 typedef enum sctp_sn_error {
 416         SCTP_FAILED_THRESHOLD,
 417         SCTP_RECEIVED_SACK,
 418         SCTP_HEARTBEAT_SUCCESS,
 419         SCTP_RESPONSE_TO_USER_REQ,
 420         SCTP_INTERNAL_ERROR,
 421         SCTP_SHUTDOWN_GUARD_EXPIRES,
 422         SCTP_PEER_FAULTY,
 423 } sctp_sn_error_t;
 424
 425 /*
 426  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 427  *
 428  *   The protocol parameters used to initialize and bound retransmission
 429  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 430  *   these parameters are used in RTO calculation.
 431  */
 432 struct sctp_rtoinfo {
 433         sctp_assoc_t    srto_assoc_id;
 434         __u32           srto_initial;
 435         __u32           srto_max;
 436         __u32           srto_min;
 437 };
 438
 439 /*
 440  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 441  *
 442  *   This option is used to both examine and set various association and
 443  *   endpoint parameters.
 444  */
 445 struct sctp_assocparams {
 446         sctp_assoc_t    sasoc_assoc_id;
 447         __u16           sasoc_asocmaxrxt;
 448         __u16           sasoc_number_peer_destinations;
 449         __u32           sasoc_peer_rwnd;
 450         __u32           sasoc_local_rwnd;
 451         __u32           sasoc_cookie_life;
 452 };
 453
 454 /*
 455  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 456  *
 457  *  Requests that the peer mark the enclosed address as the association
 458  *  primary. The enclosed address must be one of the association's
 459  *  locally bound addresses. The following structure is used to make a
 460  *   set primary request:
 461  */
 462 struct sctp_setpeerprim {
 463         sctp_assoc_t            sspp_assoc_id;
 464         struct sockaddr_storage sspp_addr;
 465 };
 466
 467 /*
 468  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 469  *
 470  *  Requests that the local SCTP stack use the enclosed peer address as
 471  *  the association primary. The enclosed address must be one of the
 472  *  association peer's addresses. The following structure is used to
 473  *  make a set peer primary request:
 474  */
 475 struct sctp_prim {
 476         sctp_assoc_t            ssp_assoc_id;
 477         struct sockaddr_storage ssp_addr;
 478 };
 479
 480 /*
 481  * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
 482  *
 483  * Requests that the local endpoint set the specified Adaption Layer
 484  * Indication parameter for all future INIT and INIT-ACK exchanges.
 485  */
 486 struct sctp_setadaption {
 487         __u32   ssb_adaption_ind;
 488 };
 489
 490 /*
 491  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 492  *
 493  *   Applications can enable or disable heartbeats for any peer address
 494  *   of an association, modify an address's heartbeat interval, force a
 495  *   heartbeat to be sent immediately, and adjust the address's maximum
 496  *   number of retransmissions sent before an address is considered
 497  *   unreachable. The following structure is used to access and modify an
 498  *   address's parameters:
 499  */
 500 struct sctp_paddrparams {
 501         sctp_assoc_t            spp_assoc_id;
 502         struct sockaddr_storage spp_address;
 503         __u32                   spp_hbinterval;
 504         __u16                   spp_pathmaxrxt;
 505 };
 506
 507 /*
 508  * 7.2.2 Peer Address Information
 509  *
 510  *   Applications can retrieve information about a specific peer address
 511  *   of an association, including its reachability state, congestion
 512  *   window, and retransmission timer values.  This information is
 513  *   read-only. The following structure is used to access this
 514  *   information:
 515  */
 516 struct sctp_paddrinfo {
 517         sctp_assoc_t            spinfo_assoc_id;
 518         struct sockaddr_storage spinfo_address;
 519         __s32                   spinfo_state;
 520         __u32                   spinfo_cwnd;
 521         __u32                   spinfo_srtt;
 522         __u32                   spinfo_rto;
 523         __u32                   spinfo_mtu;
 524 };
 525
 526 /* Peer addresses's state. */
 527 enum sctp_spinfo_state {
 528         SCTP_INACTIVE,
 529         SCTP_ACTIVE,
 530 };
 531
 532 /*
 533  * 7.2.1 Association Status (SCTP_STATUS)
 534  *
 535  *   Applications can retrieve current status information about an
 536  *   association, including association state, peer receiver window size,
 537  *   number of unacked data chunks, and number of data chunks pending
 538  *   receipt.  This information is read-only.  The following structure is
 539  *   used to access this information:
 540  */
 541 struct sctp_status {
 542         sctp_assoc_t            sstat_assoc_id;
 543         __s32                   sstat_state;
 544         __u32                   sstat_rwnd;
 545         __u16                   sstat_unackdata;
 546         __u16                   sstat_penddata;
 547         __u16                   sstat_instrms;
 548         __u16                   sstat_outstrms;
 549         __u32                   sstat_fragmentation_point;
 550         struct sctp_paddrinfo   sstat_primary;
 551 };
 552
 553 /*
 554  * 8.3, 8.5 get all peer/local addresses in an association.
 555  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
 556  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
 557  * sctp_getpaddrs() and sctp_getladdrs() API.
 558  */
 559 struct sctp_getaddrs {
 560         sctp_assoc_t            assoc_id;
 561         int                     addr_num;
 562         struct sockaddr         __user *addrs;
 563 };
 564
 565 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
 566 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
 567 enum sctp_msg_flags {
 568         MSG_NOTIFICATION = 0x8000,
 569 #define MSG_NOTIFICATION MSG_NOTIFICATION
 570 };
 571
 572 /*
 573  * 8.1 sctp_bindx()
 574  *
 575  * The flags parameter is formed from the bitwise OR of zero or more of the
 576  * following currently defined flags:
 577  */
 578 #define SCTP_BINDX_ADD_ADDR 0x01
 579 #define SCTP_BINDX_REM_ADDR 0x02
 580
 581 /* This is the structure that is passed as an argument(optval) to
 582  * getsockopt(SCTP_SOCKOPT_PEELOFF).
 583  */
 584 typedef struct {
 585         sctp_assoc_t associd;
 586         int sd;
 587 } sctp_peeloff_arg_t;
 588
 589 #endif /* __net_sctp_user_h__ */