include/net/sctp/user.h

   1 /* SCTP kernel 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 implementation
   8  *
   9  * This header represents the structures and constants needed to support
  10  * the SCTP Extension to the Sockets API.
  11  *
  12  * This SCTP 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  * This SCTP 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_ADAPTATION_LAYER,
  79 #define SCTP_ADAPTATION_LAYER SCTP_ADAPTATION_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,
  97 #define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK
  98 #define SCTP_DELAYED_ACK SCTP_DELAYED_ACK
  99         SCTP_CONTEXT,   /* Receive Context */
 100 #define SCTP_CONTEXT SCTP_CONTEXT
 101         SCTP_FRAGMENT_INTERLEAVE,
 102 #define SCTP_FRAGMENT_INTERLEAVE SCTP_FRAGMENT_INTERLEAVE
 103         SCTP_PARTIAL_DELIVERY_POINT,    /* Set/Get partial delivery point */
 104 #define SCTP_PARTIAL_DELIVERY_POINT SCTP_PARTIAL_DELIVERY_POINT
 105         SCTP_MAX_BURST,         /* Set/Get max burst */
 106 #define SCTP_MAX_BURST SCTP_MAX_BURST
 107         SCTP_AUTH_CHUNK,        /* Set only: add a chunk type to authenticat */
 108 #define SCTP_AUTH_CHUNK SCTP_AUTH_CHUNK
 109         SCTP_HMAC_IDENT,
 110 #define SCTP_HMAC_IDENT SCTP_HMAC_IDENT
 111         SCTP_AUTH_KEY,
 112 #define SCTP_AUTH_KEY SCTP_AUTH_KEY
 113         SCTP_AUTH_ACTIVE_KEY,
 114 #define SCTP_AUTH_ACTIVE_KEY SCTP_AUTH_ACTIVE_KEY
 115         SCTP_AUTH_DELETE_KEY,
 116 #define SCTP_AUTH_DELETE_KEY SCTP_AUTH_DELETE_KEY
 117         SCTP_PEER_AUTH_CHUNKS,          /* Read only */
 118 #define SCTP_PEER_AUTH_CHUNKS SCTP_PEER_AUTH_CHUNKS
 119         SCTP_LOCAL_AUTH_CHUNKS,         /* Read only */
 120 #define SCTP_LOCAL_AUTH_CHUNKS SCTP_LOCAL_AUTH_CHUNKS
 121         SCTP_GET_ASSOC_NUMBER,          /* Read only */
 122 #define SCTP_GET_ASSOC_NUMBER SCTP_GET_ASSOC_NUMBER
 123
 124
 125         /* Internal Socket Options. Some of the sctp library functions are
 126          * implemented using these socket options.
 127          */
 128         SCTP_SOCKOPT_BINDX_ADD = 100,/* BINDX requests for adding addresses. */
 129 #define SCTP_SOCKOPT_BINDX_ADD  SCTP_SOCKOPT_BINDX_ADD
 130         SCTP_SOCKOPT_BINDX_REM, /* BINDX requests for removing addresses. */
 131 #define SCTP_SOCKOPT_BINDX_REM  SCTP_SOCKOPT_BINDX_REM
 132         SCTP_SOCKOPT_PEELOFF,   /* peel off association. */
 133 #define SCTP_SOCKOPT_PEELOFF    SCTP_SOCKOPT_PEELOFF
 134         SCTP_GET_PEER_ADDRS_NUM_OLD,    /* Get number of peer addresss. */
 135 #define SCTP_GET_PEER_ADDRS_NUM_OLD     SCTP_GET_PEER_ADDRS_NUM_OLD
 136         SCTP_GET_PEER_ADDRS_OLD,        /* Get all peer addresss. */
 137 #define SCTP_GET_PEER_ADDRS_OLD SCTP_GET_PEER_ADDRS_OLD
 138         SCTP_GET_LOCAL_ADDRS_NUM_OLD,   /* Get number of local addresss. */
 139 #define SCTP_GET_LOCAL_ADDRS_NUM_OLD    SCTP_GET_LOCAL_ADDRS_NUM_OLD
 140         SCTP_GET_LOCAL_ADDRS_OLD,       /* Get all local addresss. */
 141 #define SCTP_GET_LOCAL_ADDRS_OLD        SCTP_GET_LOCAL_ADDRS_OLD
 142         SCTP_SOCKOPT_CONNECTX_OLD, /* CONNECTX old requests. */
 143 #define SCTP_SOCKOPT_CONNECTX_OLD       SCTP_SOCKOPT_CONNECTX_OLD
 144         SCTP_GET_PEER_ADDRS,    /* Get all peer addresss. */
 145 #define SCTP_GET_PEER_ADDRS     SCTP_GET_PEER_ADDRS
 146         SCTP_GET_LOCAL_ADDRS,   /* Get all local addresss. */
 147 #define SCTP_GET_LOCAL_ADDRS    SCTP_GET_LOCAL_ADDRS
 148         SCTP_SOCKOPT_CONNECTX, /* CONNECTX requests. */
 149 #define SCTP_SOCKOPT_CONNECTX   SCTP_SOCKOPT_CONNECTX
 150 };
 151
 152 /*
 153  * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
 154  *
 155  *   This cmsghdr structure provides information for initializing new
 156  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 157  *   uses this same data structure.  This structure is not used for
 158  *   recvmsg().
 159  *
 160  *   cmsg_level    cmsg_type      cmsg_data[]
 161  *   ------------  ------------   ----------------------
 162  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 163  *
 164  */
 165 struct sctp_initmsg {
 166         __u16 sinit_num_ostreams;
 167         __u16 sinit_max_instreams;
 168         __u16 sinit_max_attempts;
 169         __u16 sinit_max_init_timeo;
 170 };
 171
 172 /*
 173  * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 174  *
 175  *   This cmsghdr structure specifies SCTP options for sendmsg() and
 176  *   describes SCTP header information about a received message through
 177  *   recvmsg().
 178  *
 179  *   cmsg_level    cmsg_type      cmsg_data[]
 180  *   ------------  ------------   ----------------------
 181  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 182  *
 183  */
 184 struct sctp_sndrcvinfo {
 185         __u16 sinfo_stream;
 186         __u16 sinfo_ssn;
 187         __u16 sinfo_flags;
 188         __u32 sinfo_ppid;
 189         __u32 sinfo_context;
 190         __u32 sinfo_timetolive;
 191         __u32 sinfo_tsn;
 192         __u32 sinfo_cumtsn;
 193         sctp_assoc_t sinfo_assoc_id;
 194 };
 195
 196 /*
 197  *  sinfo_flags: 16 bits (unsigned integer)
 198  *
 199  *   This field may contain any of the following flags and is composed of
 200  *   a bitwise OR of these values.
 201  */
 202
 203 enum sctp_sinfo_flags {
 204         SCTP_UNORDERED = 1,  /* Send/receive message unordered. */
 205         SCTP_ADDR_OVER = 2,  /* Override the primary destination. */
 206         SCTP_ABORT=4,        /* Send an ABORT message to the peer. */
 207         SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */
 208 };
 209
 210
 211 typedef union {
 212         __u8                    raw;
 213         struct sctp_initmsg     init;
 214         struct sctp_sndrcvinfo  sndrcv;
 215 } sctp_cmsg_data_t;
 216
 217 /* These are cmsg_types.  */
 218 typedef enum sctp_cmsg_type {
 219         SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
 220         SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
 221 } sctp_cmsg_t;
 222
 223
 224 /*
 225  * 5.3.1.1 SCTP_ASSOC_CHANGE
 226  *
 227  *   Communication notifications inform the ULP that an SCTP association
 228  *   has either begun or ended. The identifier for a new association is
 229  *   provided by this notificaion. The notification information has the
 230  *   following format:
 231  *
 232  */
 233 struct sctp_assoc_change {
 234         __u16 sac_type;
 235         __u16 sac_flags;
 236         __u32 sac_length;
 237         __u16 sac_state;
 238         __u16 sac_error;
 239         __u16 sac_outbound_streams;
 240         __u16 sac_inbound_streams;
 241         sctp_assoc_t sac_assoc_id;
 242         __u8 sac_info[0];
 243 };
 244
 245 /*
 246  *   sac_state: 32 bits (signed integer)
 247  *
 248  *   This field holds one of a number of values that communicate the
 249  *   event that happened to the association.  They include:
 250  *
 251  *   Note:  The following state names deviate from the API draft as
 252  *   the names clash too easily with other kernel symbols.
 253  */
 254 enum sctp_sac_state {
 255         SCTP_COMM_UP,
 256         SCTP_COMM_LOST,
 257         SCTP_RESTART,
 258         SCTP_SHUTDOWN_COMP,
 259         SCTP_CANT_STR_ASSOC,
 260 };
 261
 262 /*
 263  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 264  *
 265  *   When a destination address on a multi-homed peer encounters a change
 266  *   an interface details event is sent.  The information has the
 267  *   following structure:
 268  */
 269 struct sctp_paddr_change {
 270         __u16 spc_type;
 271         __u16 spc_flags;
 272         __u32 spc_length;
 273         struct sockaddr_storage spc_aaddr;
 274         int spc_state;
 275         int spc_error;
 276         sctp_assoc_t spc_assoc_id;
 277 } __attribute__((packed, aligned(4)));
 278
 279 /*
 280  *    spc_state:  32 bits (signed integer)
 281  *
 282  *   This field holds one of a number of values that communicate the
 283  *   event that happened to the address.  They include:
 284  */
 285 enum sctp_spc_state {
 286         SCTP_ADDR_AVAILABLE,
 287         SCTP_ADDR_UNREACHABLE,
 288         SCTP_ADDR_REMOVED,
 289         SCTP_ADDR_ADDED,
 290         SCTP_ADDR_MADE_PRIM,
 291         SCTP_ADDR_CONFIRMED,
 292 };
 293
 294
 295 /*
 296  * 5.3.1.3 SCTP_REMOTE_ERROR
 297  *
 298  *   A remote peer may send an Operational Error message to its peer.
 299  *   This message indicates a variety of error conditions on an
 300  *   association. The entire error TLV as it appears on the wire is
 301  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 302  *   specification [SCTP] and any extensions for a list of possible
 303  *   error formats. SCTP error TLVs have the format:
 304  */
 305 struct sctp_remote_error {
 306         __u16 sre_type;
 307         __u16 sre_flags;
 308         __u32 sre_length;
 309         __u16 sre_error;
 310         sctp_assoc_t sre_assoc_id;
 311         __u8 sre_data[0];
 312 };
 313
 314
 315 /*
 316  * 5.3.1.4 SCTP_SEND_FAILED
 317  *
 318  *   If SCTP cannot deliver a message it may return the message as a
 319  *   notification.
 320  */
 321 struct sctp_send_failed {
 322         __u16 ssf_type;
 323         __u16 ssf_flags;
 324         __u32 ssf_length;
 325         __u32 ssf_error;
 326         struct sctp_sndrcvinfo ssf_info;
 327         sctp_assoc_t ssf_assoc_id;
 328         __u8 ssf_data[0];
 329 };
 330
 331 /*
 332  *   ssf_flags: 16 bits (unsigned integer)
 333  *
 334  *   The flag value will take one of the following values
 335  *
 336  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 337  *                       the wire.
 338  *
 339  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 340  *                       Note that this does not necessarily mean that the
 341  *                       data was (or was not) successfully delivered.
 342  */
 343 enum sctp_ssf_flags {
 344         SCTP_DATA_UNSENT,
 345         SCTP_DATA_SENT,
 346 };
 347
 348 /*
 349  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 350  *
 351  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 352  *   inform the application that it should cease sending data.
 353  */
 354 struct sctp_shutdown_event {
 355         __u16 sse_type;
 356         __u16 sse_flags;
 357         __u32 sse_length;
 358         sctp_assoc_t sse_assoc_id;
 359 };
 360
 361 /*
 362  * 5.3.1.6 SCTP_ADAPTATION_INDICATION
 363  *
 364  *   When a peer sends a Adaptation Layer Indication parameter , SCTP
 365  *   delivers this notification to inform the application
 366  *   that of the peers requested adaptation layer.
 367  */
 368 struct sctp_adaptation_event {
 369         __u16 sai_type;
 370         __u16 sai_flags;
 371         __u32 sai_length;
 372         __u32 sai_adaptation_ind;
 373         sctp_assoc_t sai_assoc_id;
 374 };
 375
 376 /*
 377  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 378  *
 379  *   When a receiver is engaged in a partial delivery of a
 380  *   message this notification will be used to indicate
 381  *   various events.
 382  */
 383 struct sctp_pdapi_event {
 384         __u16 pdapi_type;
 385         __u16 pdapi_flags;
 386         __u32 pdapi_length;
 387         __u32 pdapi_indication;
 388         sctp_assoc_t pdapi_assoc_id;
 389 };
 390
 391 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 392
 393 struct sctp_authkey_event {
 394         __u16 auth_type;
 395         __u16 auth_flags;
 396         __u32 auth_length;
 397         __u16 auth_keynumber;
 398         __u16 auth_altkeynumber;
 399         __u32 auth_indication;
 400         sctp_assoc_t auth_assoc_id;
 401 };
 402
 403 enum { SCTP_AUTH_NEWKEY = 0, };
 404
 405
 406 /*
 407  * Described in Section 7.3
 408  *   Ancillary Data and Notification Interest Options
 409  */
 410 struct sctp_event_subscribe {
 411         __u8 sctp_data_io_event;
 412         __u8 sctp_association_event;
 413         __u8 sctp_address_event;
 414         __u8 sctp_send_failure_event;
 415         __u8 sctp_peer_error_event;
 416         __u8 sctp_shutdown_event;
 417         __u8 sctp_partial_delivery_event;
 418         __u8 sctp_adaptation_layer_event;
 419         __u8 sctp_authentication_event;
 420 };
 421
 422 /*
 423  * 5.3.1 SCTP Notification Structure
 424  *
 425  *   The notification structure is defined as the union of all
 426  *   notification types.
 427  *
 428  */
 429 union sctp_notification {
 430         struct {
 431                 __u16 sn_type;             /* Notification type. */
 432                 __u16 sn_flags;
 433                 __u32 sn_length;
 434         } sn_header;
 435         struct sctp_assoc_change sn_assoc_change;
 436         struct sctp_paddr_change sn_paddr_change;
 437         struct sctp_remote_error sn_remote_error;
 438         struct sctp_send_failed sn_send_failed;
 439         struct sctp_shutdown_event sn_shutdown_event;
 440         struct sctp_adaptation_event sn_adaptation_event;
 441         struct sctp_pdapi_event sn_pdapi_event;
 442         struct sctp_authkey_event sn_authkey_event;
 443 };
 444
 445 /* Section 5.3.1
 446  * All standard values for sn_type flags are greater than 2^15.
 447  * Values from 2^15 and down are reserved.
 448  */
 449
 450 enum sctp_sn_type {
 451         SCTP_SN_TYPE_BASE     = (1<<15),
 452         SCTP_ASSOC_CHANGE,
 453         SCTP_PEER_ADDR_CHANGE,
 454         SCTP_SEND_FAILED,
 455         SCTP_REMOTE_ERROR,
 456         SCTP_SHUTDOWN_EVENT,
 457         SCTP_PARTIAL_DELIVERY_EVENT,
 458         SCTP_ADAPTATION_INDICATION,
 459         SCTP_AUTHENTICATION_INDICATION,
 460 };
 461
 462 /* Notification error codes used to fill up the error fields in some
 463  * notifications.
 464  * SCTP_PEER_ADDRESS_CHAGE      : spc_error
 465  * SCTP_ASSOC_CHANGE            : sac_error
 466  * These names should be potentially included in the draft 04 of the SCTP
 467  * sockets API specification.
 468  */
 469 typedef enum sctp_sn_error {
 470         SCTP_FAILED_THRESHOLD,
 471         SCTP_RECEIVED_SACK,
 472         SCTP_HEARTBEAT_SUCCESS,
 473         SCTP_RESPONSE_TO_USER_REQ,
 474         SCTP_INTERNAL_ERROR,
 475         SCTP_SHUTDOWN_GUARD_EXPIRES,
 476         SCTP_PEER_FAULTY,
 477 } sctp_sn_error_t;
 478
 479 /*
 480  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 481  *
 482  *   The protocol parameters used to initialize and bound retransmission
 483  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 484  *   these parameters are used in RTO calculation.
 485  */
 486 struct sctp_rtoinfo {
 487         sctp_assoc_t    srto_assoc_id;
 488         __u32           srto_initial;
 489         __u32           srto_max;
 490         __u32           srto_min;
 491 };
 492
 493 /*
 494  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 495  *
 496  *   This option is used to both examine and set various association and
 497  *   endpoint parameters.
 498  */
 499 struct sctp_assocparams {
 500         sctp_assoc_t    sasoc_assoc_id;
 501         __u16           sasoc_asocmaxrxt;
 502         __u16           sasoc_number_peer_destinations;
 503         __u32           sasoc_peer_rwnd;
 504         __u32           sasoc_local_rwnd;
 505         __u32           sasoc_cookie_life;
 506 };
 507
 508 /*
 509  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 510  *
 511  *  Requests that the peer mark the enclosed address as the association
 512  *  primary. The enclosed address must be one of the association's
 513  *  locally bound addresses. The following structure is used to make a
 514  *   set primary request:
 515  */
 516 struct sctp_setpeerprim {
 517         sctp_assoc_t            sspp_assoc_id;
 518         struct sockaddr_storage sspp_addr;
 519 } __attribute__((packed, aligned(4)));
 520
 521 /*
 522  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 523  *
 524  *  Requests that the local SCTP stack use the enclosed peer address as
 525  *  the association primary. The enclosed address must be one of the
 526  *  association peer's addresses. The following structure is used to
 527  *  make a set peer primary request:
 528  */
 529 struct sctp_prim {
 530         sctp_assoc_t            ssp_assoc_id;
 531         struct sockaddr_storage ssp_addr;
 532 } __attribute__((packed, aligned(4)));
 533
 534 /*
 535  * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
 536  *
 537  * Requests that the local endpoint set the specified Adaptation Layer
 538  * Indication parameter for all future INIT and INIT-ACK exchanges.
 539  */
 540 struct sctp_setadaptation {
 541         __u32   ssb_adaptation_ind;
 542 };
 543
 544 /*
 545  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 546  *
 547  *   Applications can enable or disable heartbeats for any peer address
 548  *   of an association, modify an address's heartbeat interval, force a
 549  *   heartbeat to be sent immediately, and adjust the address's maximum
 550  *   number of retransmissions sent before an address is considered
 551  *   unreachable. The following structure is used to access and modify an
 552  *   address's parameters:
 553  */
 554 enum  sctp_spp_flags {
 555         SPP_HB_ENABLE = 1<<0,           /*Enable heartbeats*/
 556         SPP_HB_DISABLE = 1<<1,          /*Disable heartbeats*/
 557         SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
 558         SPP_HB_DEMAND = 1<<2,           /*Send heartbeat immediately*/
 559         SPP_PMTUD_ENABLE = 1<<3,        /*Enable PMTU discovery*/
 560         SPP_PMTUD_DISABLE = 1<<4,       /*Disable PMTU discovery*/
 561         SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
 562         SPP_SACKDELAY_ENABLE = 1<<5,    /*Enable SACK*/
 563         SPP_SACKDELAY_DISABLE = 1<<6,   /*Disable SACK*/
 564         SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
 565         SPP_HB_TIME_IS_ZERO = 1<<7,     /* Set HB delay to 0 */
 566 };
 567
 568 struct sctp_paddrparams {
 569         sctp_assoc_t            spp_assoc_id;
 570         struct sockaddr_storage spp_address;
 571         __u32                   spp_hbinterval;
 572         __u16                   spp_pathmaxrxt;
 573         __u32                   spp_pathmtu;
 574         __u32                   spp_sackdelay;
 575         __u32                   spp_flags;
 576 } __attribute__((packed, aligned(4)));
 577
 578 /*
 579  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 580  *
 581  * This set option adds a chunk type that the user is requesting to be
 582  * received only in an authenticated way.  Changes to the list of chunks
 583  * will only effect future associations on the socket.
 584  */
 585 struct sctp_authchunk {
 586         __u8            sauth_chunk;
 587 };
 588
 589 /*
 590  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 591  *
 592  * This option gets or sets the list of HMAC algorithms that the local
 593  * endpoint requires the peer to use.
 594 */
 595 struct sctp_hmacalgo {
 596         __u32           shmac_num_idents;
 597         __u16           shmac_idents[];
 598 };
 599
 600 /*
 601  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 602  *
 603  * This option will set a shared secret key which is used to build an
 604  * association shared key.
 605  */
 606 struct sctp_authkey {
 607         sctp_assoc_t    sca_assoc_id;
 608         __u16           sca_keynumber;
 609         __u16           sca_keylength;
 610         __u8            sca_key[];
 611 };
 612
 613 /*
 614  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 615  *
 616  * This option will get or set the active shared key to be used to build
 617  * the association shared key.
 618  */
 619
 620 struct sctp_authkeyid {
 621         sctp_assoc_t    scact_assoc_id;
 622         __u16           scact_keynumber;
 623 };
 624
 625
 626 /*
 627  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 628  *
 629  * This option will effect the way delayed acks are performed.  This
 630  * option allows you to get or set the delayed ack time, in
 631  * milliseconds.  It also allows changing the delayed ack frequency.
 632  * Changing the frequency to 1 disables the delayed sack algorithm.  If
 633  * the assoc_id is 0, then this sets or gets the endpoints default
 634  * values.  If the assoc_id field is non-zero, then the set or get
 635  * effects the specified association for the one to many model (the
 636  * assoc_id field is ignored by the one to one model).  Note that if
 637  * sack_delay or sack_freq are 0 when setting this option, then the
 638  * current values will remain unchanged.
 639  */
 640 struct sctp_sack_info {
 641         sctp_assoc_t    sack_assoc_id;
 642         uint32_t        sack_delay;
 643         uint32_t        sack_freq;
 644 };
 645
 646 struct sctp_assoc_value {
 647     sctp_assoc_t            assoc_id;
 648     uint32_t                assoc_value;
 649 };
 650
 651 /*
 652  * 7.2.2 Peer Address Information
 653  *
 654  *   Applications can retrieve information about a specific peer address
 655  *   of an association, including its reachability state, congestion
 656  *   window, and retransmission timer values.  This information is
 657  *   read-only. The following structure is used to access this
 658  *   information:
 659  */
 660 struct sctp_paddrinfo {
 661         sctp_assoc_t            spinfo_assoc_id;
 662         struct sockaddr_storage spinfo_address;
 663         __s32                   spinfo_state;
 664         __u32                   spinfo_cwnd;
 665         __u32                   spinfo_srtt;
 666         __u32                   spinfo_rto;
 667         __u32                   spinfo_mtu;
 668 } __attribute__((packed, aligned(4)));
 669
 670 /* Peer addresses's state. */
 671 /* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
 672  * calls.
 673  * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
 674  *              Not yet confirmed by a heartbeat and not available for data
 675  *              transfers.
 676  * ACTIVE : Peer address confirmed, active and available for data transfers.
 677  * INACTIVE: Peer address inactive and not available for data transfers.
 678  */
 679 enum sctp_spinfo_state {
 680         SCTP_INACTIVE,
 681         SCTP_ACTIVE,
 682         SCTP_UNCONFIRMED,
 683         SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 684 };
 685
 686 /*
 687  * 7.2.1 Association Status (SCTP_STATUS)
 688  *
 689  *   Applications can retrieve current status information about an
 690  *   association, including association state, peer receiver window size,
 691  *   number of unacked data chunks, and number of data chunks pending
 692  *   receipt.  This information is read-only.  The following structure is
 693  *   used to access this information:
 694  */
 695 struct sctp_status {
 696         sctp_assoc_t            sstat_assoc_id;
 697         __s32                   sstat_state;
 698         __u32                   sstat_rwnd;
 699         __u16                   sstat_unackdata;
 700         __u16                   sstat_penddata;
 701         __u16                   sstat_instrms;
 702         __u16                   sstat_outstrms;
 703         __u32                   sstat_fragmentation_point;
 704         struct sctp_paddrinfo   sstat_primary;
 705 };
 706
 707 /*
 708  * 7.2.3.  Get the list of chunks the peer requires to be authenticated
 709  *         (SCTP_PEER_AUTH_CHUNKS)
 710  *
 711  * This option gets a list of chunks for a specified association that
 712  * the peer requires to be received authenticated only.
 713  */
 714 struct sctp_authchunks {
 715         sctp_assoc_t    gauth_assoc_id;
 716         __u32           gauth_number_of_chunks;
 717         uint8_t         gauth_chunks[];
 718 };
 719
 720 /*
 721  * 8.3, 8.5 get all peer/local addresses in an association.
 722  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
 723  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
 724  * sctp_getpaddrs() and sctp_getladdrs() API.
 725  */
 726 struct sctp_getaddrs_old {
 727         sctp_assoc_t            assoc_id;
 728         int                     addr_num;
 729         struct sockaddr         __user *addrs;
 730 };
 731 struct sctp_getaddrs {
 732         sctp_assoc_t            assoc_id; /*input*/
 733         __u32                   addr_num; /*output*/
 734         __u8                    addrs[0]; /*output, variable size*/
 735 };
 736
 737 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
 738 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
 739 enum sctp_msg_flags {
 740         MSG_NOTIFICATION = 0x8000,
 741 #define MSG_NOTIFICATION MSG_NOTIFICATION
 742 };
 743
 744 /*
 745  * 8.1 sctp_bindx()
 746  *
 747  * The flags parameter is formed from the bitwise OR of zero or more of the
 748  * following currently defined flags:
 749  */
 750 #define SCTP_BINDX_ADD_ADDR 0x01
 751 #define SCTP_BINDX_REM_ADDR 0x02
 752
 753 /* This is the structure that is passed as an argument(optval) to
 754  * getsockopt(SCTP_SOCKOPT_PEELOFF).
 755  */
 756 typedef struct {
 757         sctp_assoc_t associd;
 758         int sd;
 759 } sctp_peeloff_arg_t;
 760
 761 #endif /* __net_sctp_user_h__ */