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         SCTP_DELAYED_ACK_TIME,
  97 #define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK_TIME
  98
  99         /* Internal Socket Options. Some of the sctp library functions are
 100          * implemented using these socket options.
 101          */
 102         SCTP_SOCKOPT_BINDX_ADD = 100,/* BINDX requests for adding addresses. */
 103 #define SCTP_SOCKOPT_BINDX_ADD  SCTP_SOCKOPT_BINDX_ADD
 104         SCTP_SOCKOPT_BINDX_REM, /* BINDX requests for removing addresses. */
 105 #define SCTP_SOCKOPT_BINDX_REM  SCTP_SOCKOPT_BINDX_REM
 106         SCTP_SOCKOPT_PEELOFF,   /* peel off association. */
 107 #define SCTP_SOCKOPT_PEELOFF    SCTP_SOCKOPT_PEELOFF
 108         SCTP_GET_PEER_ADDRS_NUM_OLD,    /* Get number of peer addresss. */
 109 #define SCTP_GET_PEER_ADDRS_NUM_OLD     SCTP_GET_PEER_ADDRS_NUM_OLD
 110         SCTP_GET_PEER_ADDRS_OLD,        /* Get all peer addresss. */
 111 #define SCTP_GET_PEER_ADDRS_OLD SCTP_GET_PEER_ADDRS_OLD
 112         SCTP_GET_LOCAL_ADDRS_NUM_OLD,   /* Get number of local addresss. */
 113 #define SCTP_GET_LOCAL_ADDRS_NUM_OLD    SCTP_GET_LOCAL_ADDRS_NUM_OLD
 114         SCTP_GET_LOCAL_ADDRS_OLD,       /* Get all local addresss. */
 115 #define SCTP_GET_LOCAL_ADDRS_OLD        SCTP_GET_LOCAL_ADDRS_OLD
 116         SCTP_SOCKOPT_CONNECTX, /* CONNECTX requests. */
 117 #define SCTP_SOCKOPT_CONNECTX   SCTP_SOCKOPT_CONNECTX
 118         SCTP_GET_PEER_ADDRS,    /* Get all peer addresss. */
 119 #define SCTP_GET_PEER_ADDRS     SCTP_GET_PEER_ADDRS
 120         SCTP_GET_LOCAL_ADDRS,   /* Get all local addresss. */
 121 #define SCTP_GET_LOCAL_ADDRS    SCTP_GET_LOCAL_ADDRS
 122 };
 123
 124 /*
 125  * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
 126  *
 127  *   This cmsghdr structure provides information for initializing new
 128  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 129  *   uses this same data structure.  This structure is not used for
 130  *   recvmsg().
 131  *
 132  *   cmsg_level    cmsg_type      cmsg_data[]
 133  *   ------------  ------------   ----------------------
 134  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 135  *
 136  */
 137 struct sctp_initmsg {
 138         __u16 sinit_num_ostreams;
 139         __u16 sinit_max_instreams;
 140         __u16 sinit_max_attempts;
 141         __u16 sinit_max_init_timeo;
 142 };
 143
 144 /*
 145  * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 146  *
 147  *   This cmsghdr structure specifies SCTP options for sendmsg() and
 148  *   describes SCTP header information about a received message through
 149  *   recvmsg().
 150  *
 151  *   cmsg_level    cmsg_type      cmsg_data[]
 152  *   ------------  ------------   ----------------------
 153  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 154  *
 155  */
 156 struct sctp_sndrcvinfo {
 157         __u16 sinfo_stream;
 158         __u16 sinfo_ssn;
 159         __u16 sinfo_flags;
 160         __u32 sinfo_ppid;
 161         __u32 sinfo_context;
 162         __u32 sinfo_timetolive;
 163         __u32 sinfo_tsn;
 164         __u32 sinfo_cumtsn;
 165         sctp_assoc_t sinfo_assoc_id;
 166 };
 167
 168 /*
 169  *  sinfo_flags: 16 bits (unsigned integer)
 170  *
 171  *   This field may contain any of the following flags and is composed of
 172  *   a bitwise OR of these values.
 173  */
 174
 175 enum sctp_sinfo_flags {
 176         SCTP_UNORDERED = 1,  /* Send/receive message unordered. */
 177         SCTP_ADDR_OVER = 2,  /* Override the primary destination. */
 178         SCTP_ABORT=4,        /* Send an ABORT message to the peer. */
 179         SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */
 180 };
 181
 182
 183 typedef union {
 184         __u8                    raw;
 185         struct sctp_initmsg     init;
 186         struct sctp_sndrcvinfo  sndrcv;
 187 } sctp_cmsg_data_t;
 188
 189 /* These are cmsg_types.  */
 190 typedef enum sctp_cmsg_type {
 191         SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
 192         SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
 193 } sctp_cmsg_t;
 194
 195
 196 /*
 197  * 5.3.1.1 SCTP_ASSOC_CHANGE
 198  *
 199  *   Communication notifications inform the ULP that an SCTP association
 200  *   has either begun or ended. The identifier for a new association is
 201  *   provided by this notificaion. The notification information has the
 202  *   following format:
 203  *
 204  */
 205 struct sctp_assoc_change {
 206         __u16 sac_type;
 207         __u16 sac_flags;
 208         __u32 sac_length;
 209         __u16 sac_state;
 210         __u16 sac_error;
 211         __u16 sac_outbound_streams;
 212         __u16 sac_inbound_streams;
 213         sctp_assoc_t sac_assoc_id;
 214 };
 215
 216 /*
 217  *   sac_state: 32 bits (signed integer)
 218  *
 219  *   This field holds one of a number of values that communicate the
 220  *   event that happened to the association.  They include:
 221  *
 222  *   Note:  The following state names deviate from the API draft as
 223  *   the names clash too easily with other kernel symbols.
 224  */
 225 enum sctp_sac_state {
 226         SCTP_COMM_UP,
 227         SCTP_COMM_LOST,
 228         SCTP_RESTART,
 229         SCTP_SHUTDOWN_COMP,
 230         SCTP_CANT_STR_ASSOC,
 231 };
 232
 233 /*
 234  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 235  *
 236  *   When a destination address on a multi-homed peer encounters a change
 237  *   an interface details event is sent.  The information has the
 238  *   following structure:
 239  */
 240 struct sctp_paddr_change {
 241         __u16 spc_type;
 242         __u16 spc_flags;
 243         __u32 spc_length;
 244         struct sockaddr_storage spc_aaddr;
 245         int spc_state;
 246         int spc_error;
 247         sctp_assoc_t spc_assoc_id;
 248 } __attribute__((packed, aligned(4)));
 249
 250 /*
 251  *    spc_state:  32 bits (signed integer)
 252  *
 253  *   This field holds one of a number of values that communicate the
 254  *   event that happened to the address.  They include:
 255  */
 256 enum sctp_spc_state {
 257         SCTP_ADDR_AVAILABLE,
 258         SCTP_ADDR_UNREACHABLE,
 259         SCTP_ADDR_REMOVED,
 260         SCTP_ADDR_ADDED,
 261         SCTP_ADDR_MADE_PRIM,
 262 };
 263
 264
 265 /*
 266  * 5.3.1.3 SCTP_REMOTE_ERROR
 267  *
 268  *   A remote peer may send an Operational Error message to its peer.
 269  *   This message indicates a variety of error conditions on an
 270  *   association. The entire error TLV as it appears on the wire is
 271  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 272  *   specification [SCTP] and any extensions for a list of possible
 273  *   error formats. SCTP error TLVs have the format:
 274  */
 275 struct sctp_remote_error {
 276         __u16 sre_type;
 277         __u16 sre_flags;
 278         __u32 sre_length;
 279         __u16 sre_error;
 280         sctp_assoc_t sre_assoc_id;
 281         __u8 sre_data[0];
 282 };
 283
 284
 285 /*
 286  * 5.3.1.4 SCTP_SEND_FAILED
 287  *
 288  *   If SCTP cannot deliver a message it may return the message as a
 289  *   notification.
 290  */
 291 struct sctp_send_failed {
 292         __u16 ssf_type;
 293         __u16 ssf_flags;
 294         __u32 ssf_length;
 295         __u32 ssf_error;
 296         struct sctp_sndrcvinfo ssf_info;
 297         sctp_assoc_t ssf_assoc_id;
 298         __u8 ssf_data[0];
 299 };
 300
 301 /*
 302  *   ssf_flags: 16 bits (unsigned integer)
 303  *
 304  *   The flag value will take one of the following values
 305  *
 306  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 307  *                       the wire.
 308  *
 309  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 310  *                       Note that this does not necessarily mean that the
 311  *                       data was (or was not) successfully delivered.
 312  */
 313 enum sctp_ssf_flags {
 314         SCTP_DATA_UNSENT,
 315         SCTP_DATA_SENT,
 316 };
 317
 318 /*
 319  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 320  *
 321  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 322  *   inform the application that it should cease sending data.
 323  */
 324 struct sctp_shutdown_event {
 325         __u16 sse_type;
 326         __u16 sse_flags;
 327         __u32 sse_length;
 328         sctp_assoc_t sse_assoc_id;
 329 };
 330
 331 /*
 332  * 5.3.1.6 SCTP_ADAPTION_INDICATION
 333  *
 334  *   When a peer sends a Adaption Layer Indication parameter , SCTP
 335  *   delivers this notification to inform the application
 336  *   that of the peers requested adaption layer.
 337  */
 338 struct sctp_adaption_event {
 339         __u16 sai_type;
 340         __u16 sai_flags;
 341         __u32 sai_length;
 342         __u32 sai_adaption_ind;
 343         sctp_assoc_t sai_assoc_id;
 344 };
 345
 346 /*
 347  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 348  *
 349  *   When a receiver is engaged in a partial delivery of a
 350  *   message this notification will be used to indicate
 351  *   various events.
 352  */
 353 struct sctp_pdapi_event {
 354         __u16 pdapi_type;
 355         __u16 pdapi_flags;
 356         __u32 pdapi_length;
 357         __u32 pdapi_indication;
 358         sctp_assoc_t pdapi_assoc_id;
 359 };
 360
 361 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 362
 363 /*
 364  * Described in Section 7.3
 365  *   Ancillary Data and Notification Interest Options
 366  */
 367 struct sctp_event_subscribe {
 368         __u8 sctp_data_io_event;
 369         __u8 sctp_association_event;
 370         __u8 sctp_address_event;
 371         __u8 sctp_send_failure_event;
 372         __u8 sctp_peer_error_event;
 373         __u8 sctp_shutdown_event;
 374         __u8 sctp_partial_delivery_event;
 375         __u8 sctp_adaption_layer_event;
 376 };
 377
 378 /*
 379  * 5.3.1 SCTP Notification Structure
 380  *
 381  *   The notification structure is defined as the union of all
 382  *   notification types.
 383  *
 384  */
 385 union sctp_notification {
 386         struct {
 387                 __u16 sn_type;             /* Notification type. */
 388                 __u16 sn_flags;
 389                 __u32 sn_length;
 390         } sn_header;
 391         struct sctp_assoc_change sn_assoc_change;
 392         struct sctp_paddr_change sn_paddr_change;
 393         struct sctp_remote_error sn_remote_error;
 394         struct sctp_send_failed sn_send_failed;
 395         struct sctp_shutdown_event sn_shutdown_event;
 396         struct sctp_adaption_event sn_adaption_event;
 397         struct sctp_pdapi_event sn_pdapi_event;
 398 };
 399
 400 /* Section 5.3.1
 401  * All standard values for sn_type flags are greater than 2^15.
 402  * Values from 2^15 and down are reserved.
 403  */
 404
 405 enum sctp_sn_type {
 406         SCTP_SN_TYPE_BASE     = (1<<15),
 407         SCTP_ASSOC_CHANGE,
 408         SCTP_PEER_ADDR_CHANGE,
 409         SCTP_SEND_FAILED,
 410         SCTP_REMOTE_ERROR,
 411         SCTP_SHUTDOWN_EVENT,
 412         SCTP_PARTIAL_DELIVERY_EVENT,
 413         SCTP_ADAPTION_INDICATION,
 414 };
 415
 416 /* Notification error codes used to fill up the error fields in some
 417  * notifications.
 418  * SCTP_PEER_ADDRESS_CHAGE      : spc_error
 419  * SCTP_ASSOC_CHANGE            : sac_error
 420  * These names should be potentially included in the draft 04 of the SCTP
 421  * sockets API specification.
 422  */
 423 typedef enum sctp_sn_error {
 424         SCTP_FAILED_THRESHOLD,
 425         SCTP_RECEIVED_SACK,
 426         SCTP_HEARTBEAT_SUCCESS,
 427         SCTP_RESPONSE_TO_USER_REQ,
 428         SCTP_INTERNAL_ERROR,
 429         SCTP_SHUTDOWN_GUARD_EXPIRES,
 430         SCTP_PEER_FAULTY,
 431 } sctp_sn_error_t;
 432
 433 /*
 434  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 435  *
 436  *   The protocol parameters used to initialize and bound retransmission
 437  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 438  *   these parameters are used in RTO calculation.
 439  */
 440 struct sctp_rtoinfo {
 441         sctp_assoc_t    srto_assoc_id;
 442         __u32           srto_initial;
 443         __u32           srto_max;
 444         __u32           srto_min;
 445 };
 446
 447 /*
 448  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 449  *
 450  *   This option is used to both examine and set various association and
 451  *   endpoint parameters.
 452  */
 453 struct sctp_assocparams {
 454         sctp_assoc_t    sasoc_assoc_id;
 455         __u16           sasoc_asocmaxrxt;
 456         __u16           sasoc_number_peer_destinations;
 457         __u32           sasoc_peer_rwnd;
 458         __u32           sasoc_local_rwnd;
 459         __u32           sasoc_cookie_life;
 460 };
 461
 462 /*
 463  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 464  *
 465  *  Requests that the peer mark the enclosed address as the association
 466  *  primary. The enclosed address must be one of the association's
 467  *  locally bound addresses. The following structure is used to make a
 468  *   set primary request:
 469  */
 470 struct sctp_setpeerprim {
 471         sctp_assoc_t            sspp_assoc_id;
 472         struct sockaddr_storage sspp_addr;
 473 } __attribute__((packed, aligned(4)));
 474
 475 /*
 476  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 477  *
 478  *  Requests that the local SCTP stack use the enclosed peer address as
 479  *  the association primary. The enclosed address must be one of the
 480  *  association peer's addresses. The following structure is used to
 481  *  make a set peer primary request:
 482  */
 483 struct sctp_prim {
 484         sctp_assoc_t            ssp_assoc_id;
 485         struct sockaddr_storage ssp_addr;
 486 } __attribute__((packed, aligned(4)));
 487
 488 /*
 489  * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
 490  *
 491  * Requests that the local endpoint set the specified Adaption Layer
 492  * Indication parameter for all future INIT and INIT-ACK exchanges.
 493  */
 494 struct sctp_setadaption {
 495         __u32   ssb_adaption_ind;
 496 };
 497
 498 /*
 499  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 500  *
 501  *   Applications can enable or disable heartbeats for any peer address
 502  *   of an association, modify an address's heartbeat interval, force a
 503  *   heartbeat to be sent immediately, and adjust the address's maximum
 504  *   number of retransmissions sent before an address is considered
 505  *   unreachable. The following structure is used to access and modify an
 506  *   address's parameters:
 507  */
 508 enum  sctp_spp_flags {
 509         SPP_HB_ENABLE = 1,              /*Enable heartbeats*/
 510         SPP_HB_DISABLE = 2,             /*Disable heartbeats*/
 511         SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
 512         SPP_HB_DEMAND = 4,              /*Send heartbeat immediately*/
 513         SPP_PMTUD_ENABLE = 8,           /*Enable PMTU discovery*/
 514         SPP_PMTUD_DISABLE = 16,         /*Disable PMTU discovery*/
 515         SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
 516         SPP_SACKDELAY_ENABLE = 32,      /*Enable SACK*/
 517         SPP_SACKDELAY_DISABLE = 64,     /*Disable SACK*/
 518         SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
 519 };
 520
 521 struct sctp_paddrparams {
 522         sctp_assoc_t            spp_assoc_id;
 523         struct sockaddr_storage spp_address;
 524         __u32                   spp_hbinterval;
 525         __u16                   spp_pathmaxrxt;
 526         __u32                   spp_pathmtu;
 527         __u32                   spp_sackdelay;
 528         __u32                   spp_flags;
 529 } __attribute__((packed, aligned(4)));
 530
 531 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
 532  *
 533  *   This options will get or set the delayed ack timer.  The time is set
 534  *   in milliseconds.  If the assoc_id is 0, then this sets or gets the
 535  *   endpoints default delayed ack timer value.  If the assoc_id field is
 536  *   non-zero, then the set or get effects the specified association.
 537  */
 538 struct sctp_assoc_value {
 539     sctp_assoc_t            assoc_id;
 540     uint32_t                assoc_value;
 541 };
 542
 543 /*
 544  * 7.2.2 Peer Address Information
 545  *
 546  *   Applications can retrieve information about a specific peer address
 547  *   of an association, including its reachability state, congestion
 548  *   window, and retransmission timer values.  This information is
 549  *   read-only. The following structure is used to access this
 550  *   information:
 551  */
 552 struct sctp_paddrinfo {
 553         sctp_assoc_t            spinfo_assoc_id;
 554         struct sockaddr_storage spinfo_address;
 555         __s32                   spinfo_state;
 556         __u32                   spinfo_cwnd;
 557         __u32                   spinfo_srtt;
 558         __u32                   spinfo_rto;
 559         __u32                   spinfo_mtu;
 560 } __attribute__((packed, aligned(4)));
 561
 562 /* Peer addresses's state. */
 563 enum sctp_spinfo_state {
 564         SCTP_INACTIVE,
 565         SCTP_ACTIVE,
 566         SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 567 };
 568
 569 /*
 570  * 7.2.1 Association Status (SCTP_STATUS)
 571  *
 572  *   Applications can retrieve current status information about an
 573  *   association, including association state, peer receiver window size,
 574  *   number of unacked data chunks, and number of data chunks pending
 575  *   receipt.  This information is read-only.  The following structure is
 576  *   used to access this information:
 577  */
 578 struct sctp_status {
 579         sctp_assoc_t            sstat_assoc_id;
 580         __s32                   sstat_state;
 581         __u32                   sstat_rwnd;
 582         __u16                   sstat_unackdata;
 583         __u16                   sstat_penddata;
 584         __u16                   sstat_instrms;
 585         __u16                   sstat_outstrms;
 586         __u32                   sstat_fragmentation_point;
 587         struct sctp_paddrinfo   sstat_primary;
 588 };
 589
 590 /*
 591  * 8.3, 8.5 get all peer/local addresses in an association.
 592  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
 593  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
 594  * sctp_getpaddrs() and sctp_getladdrs() API.
 595  */
 596 struct sctp_getaddrs_old {
 597         sctp_assoc_t            assoc_id;
 598         int                     addr_num;
 599         struct sockaddr         __user *addrs;
 600 };
 601 struct sctp_getaddrs {
 602         sctp_assoc_t            assoc_id; /*input*/
 603         __u32                   addr_num; /*output*/
 604         __u8                    addrs[0]; /*output, variable size*/
 605 };
 606
 607 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
 608 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
 609 enum sctp_msg_flags {
 610         MSG_NOTIFICATION = 0x8000,
 611 #define MSG_NOTIFICATION MSG_NOTIFICATION
 612 };
 613
 614 /*
 615  * 8.1 sctp_bindx()
 616  *
 617  * The flags parameter is formed from the bitwise OR of zero or more of the
 618  * following currently defined flags:
 619  */
 620 #define SCTP_BINDX_ADD_ADDR 0x01
 621 #define SCTP_BINDX_REM_ADDR 0x02
 622
 623 /* This is the structure that is passed as an argument(optval) to
 624  * getsockopt(SCTP_SOCKOPT_PEELOFF).
 625  */
 626 typedef struct {
 627         sctp_assoc_t associd;
 628         int sd;
 629 } sctp_peeloff_arg_t;
 630
 631 #endif /* __net_sctp_user_h__ */