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