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 #define SCTP_RTOINFO    0
  64 #define SCTP_ASSOCINFO  1
  65 #define SCTP_INITMSG    2
  66 #define SCTP_NODELAY    3               /* Get/set nodelay option. */
  67 #define SCTP_AUTOCLOSE  4
  68 #define SCTP_SET_PEER_PRIMARY_ADDR 5
  69 #define SCTP_PRIMARY_ADDR       6
  70 #define SCTP_ADAPTATION_LAYER   7
  71 #define SCTP_DISABLE_FRAGMENTS  8
  72 #define SCTP_PEER_ADDR_PARAMS   9
  73 #define SCTP_DEFAULT_SEND_PARAM 10
  74 #define SCTP_EVENTS     11
  75 #define SCTP_I_WANT_MAPPED_V4_ADDR 12   /* Turn on/off mapped v4 addresses  */
  76 #define SCTP_MAXSEG     13              /* Get/set maximum fragment. */
  77 #define SCTP_STATUS     14
  78 #define SCTP_GET_PEER_ADDR_INFO 15
  79 #define SCTP_DELAYED_ACK_TIME   16
  80 #define SCTP_DELAYED_ACK SCTP_DELAYED_ACK_TIME
  81 #define SCTP_DELAYED_SACK SCTP_DELAYED_ACK_TIME
  82 #define SCTP_CONTEXT    17
  83 #define SCTP_FRAGMENT_INTERLEAVE        18
  84 #define SCTP_PARTIAL_DELIVERY_POINT     19 /* Set/Get partial delivery point */
  85 #define SCTP_MAX_BURST  20              /* Set/Get max burst */
  86 #define SCTP_AUTH_CHUNK 21      /* Set only: add a chunk type to authenticate */
  87 #define SCTP_HMAC_IDENT 22
  88 #define SCTP_AUTH_KEY   23
  89 #define SCTP_AUTH_ACTIVE_KEY    24
  90 #define SCTP_AUTH_DELETE_KEY    25
  91 #define SCTP_PEER_AUTH_CHUNKS   26      /* Read only */
  92 #define SCTP_LOCAL_AUTH_CHUNKS  27      /* Read only */
  93 #define SCTP_GET_ASSOC_NUMBER   28      /* Read only */
  94 #define SCTP_GET_ASSOC_ID_LIST  29      /* Read only */
  95 #define SCTP_AUTO_ASCONF       30
  96
  97 /* Internal Socket Options. Some of the sctp library functions are
  98  * implemented using these socket options.
  99  */
 100 #define SCTP_SOCKOPT_BINDX_ADD  100     /* BINDX requests for adding addrs */
 101 #define SCTP_SOCKOPT_BINDX_REM  101     /* BINDX requests for removing addrs. */
 102 #define SCTP_SOCKOPT_PEELOFF    102     /* peel off association. */
 103 /* Options 104-106 are deprecated and removed. Do not use this space */
 104 #define SCTP_SOCKOPT_CONNECTX_OLD       107     /* CONNECTX old requests. */
 105 #define SCTP_GET_PEER_ADDRS     108             /* Get all peer address. */
 106 #define SCTP_GET_LOCAL_ADDRS    109             /* Get all local address. */
 107 #define SCTP_SOCKOPT_CONNECTX   110             /* CONNECTX requests. */
 108 #define SCTP_SOCKOPT_CONNECTX3  111     /* CONNECTX requests (updated) */
 109
 110 /*
 111  * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
 112  *
 113  *   This cmsghdr structure provides information for initializing new
 114  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 115  *   uses this same data structure.  This structure is not used for
 116  *   recvmsg().
 117  *
 118  *   cmsg_level    cmsg_type      cmsg_data[]
 119  *   ------------  ------------   ----------------------
 120  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 121  *
 122  */
 123 struct sctp_initmsg {
 124         __u16 sinit_num_ostreams;
 125         __u16 sinit_max_instreams;
 126         __u16 sinit_max_attempts;
 127         __u16 sinit_max_init_timeo;
 128 };
 129
 130 /*
 131  * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 132  *
 133  *   This cmsghdr structure specifies SCTP options for sendmsg() and
 134  *   describes SCTP header information about a received message through
 135  *   recvmsg().
 136  *
 137  *   cmsg_level    cmsg_type      cmsg_data[]
 138  *   ------------  ------------   ----------------------
 139  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 140  *
 141  */
 142 struct sctp_sndrcvinfo {
 143         __u16 sinfo_stream;
 144         __u16 sinfo_ssn;
 145         __u16 sinfo_flags;
 146         __u32 sinfo_ppid;
 147         __u32 sinfo_context;
 148         __u32 sinfo_timetolive;
 149         __u32 sinfo_tsn;
 150         __u32 sinfo_cumtsn;
 151         sctp_assoc_t sinfo_assoc_id;
 152 };
 153
 154 /*
 155  *  sinfo_flags: 16 bits (unsigned integer)
 156  *
 157  *   This field may contain any of the following flags and is composed of
 158  *   a bitwise OR of these values.
 159  */
 160
 161 enum sctp_sinfo_flags {
 162         SCTP_UNORDERED = 1,  /* Send/receive message unordered. */
 163         SCTP_ADDR_OVER = 2,  /* Override the primary destination. */
 164         SCTP_ABORT=4,        /* Send an ABORT message to the peer. */
 165         SCTP_SACK_IMMEDIATELY = 8,      /* SACK should be sent without delay */
 166         SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */
 167 };
 168
 169
 170 /* These are cmsg_types.  */
 171 typedef enum sctp_cmsg_type {
 172         SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
 173         SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
 174 } sctp_cmsg_t;
 175
 176
 177 /*
 178  * 5.3.1.1 SCTP_ASSOC_CHANGE
 179  *
 180  *   Communication notifications inform the ULP that an SCTP association
 181  *   has either begun or ended. The identifier for a new association is
 182  *   provided by this notificaion. The notification information has the
 183  *   following format:
 184  *
 185  */
 186 struct sctp_assoc_change {
 187         __u16 sac_type;
 188         __u16 sac_flags;
 189         __u32 sac_length;
 190         __u16 sac_state;
 191         __u16 sac_error;
 192         __u16 sac_outbound_streams;
 193         __u16 sac_inbound_streams;
 194         sctp_assoc_t sac_assoc_id;
 195         __u8 sac_info[0];
 196 };
 197
 198 /*
 199  *   sac_state: 32 bits (signed integer)
 200  *
 201  *   This field holds one of a number of values that communicate the
 202  *   event that happened to the association.  They include:
 203  *
 204  *   Note:  The following state names deviate from the API draft as
 205  *   the names clash too easily with other kernel symbols.
 206  */
 207 enum sctp_sac_state {
 208         SCTP_COMM_UP,
 209         SCTP_COMM_LOST,
 210         SCTP_RESTART,
 211         SCTP_SHUTDOWN_COMP,
 212         SCTP_CANT_STR_ASSOC,
 213 };
 214
 215 /*
 216  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 217  *
 218  *   When a destination address on a multi-homed peer encounters a change
 219  *   an interface details event is sent.  The information has the
 220  *   following structure:
 221  */
 222 struct sctp_paddr_change {
 223         __u16 spc_type;
 224         __u16 spc_flags;
 225         __u32 spc_length;
 226         struct sockaddr_storage spc_aaddr;
 227         int spc_state;
 228         int spc_error;
 229         sctp_assoc_t spc_assoc_id;
 230 } __attribute__((packed, aligned(4)));
 231
 232 /*
 233  *    spc_state:  32 bits (signed integer)
 234  *
 235  *   This field holds one of a number of values that communicate the
 236  *   event that happened to the address.  They include:
 237  */
 238 enum sctp_spc_state {
 239         SCTP_ADDR_AVAILABLE,
 240         SCTP_ADDR_UNREACHABLE,
 241         SCTP_ADDR_REMOVED,
 242         SCTP_ADDR_ADDED,
 243         SCTP_ADDR_MADE_PRIM,
 244         SCTP_ADDR_CONFIRMED,
 245 };
 246
 247
 248 /*
 249  * 5.3.1.3 SCTP_REMOTE_ERROR
 250  *
 251  *   A remote peer may send an Operational Error message to its peer.
 252  *   This message indicates a variety of error conditions on an
 253  *   association. The entire error TLV as it appears on the wire is
 254  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 255  *   specification [SCTP] and any extensions for a list of possible
 256  *   error formats. SCTP error TLVs have the format:
 257  */
 258 struct sctp_remote_error {
 259         __u16 sre_type;
 260         __u16 sre_flags;
 261         __u32 sre_length;
 262         __u16 sre_error;
 263         sctp_assoc_t sre_assoc_id;
 264         __u8 sre_data[0];
 265 };
 266
 267
 268 /*
 269  * 5.3.1.4 SCTP_SEND_FAILED
 270  *
 271  *   If SCTP cannot deliver a message it may return the message as a
 272  *   notification.
 273  */
 274 struct sctp_send_failed {
 275         __u16 ssf_type;
 276         __u16 ssf_flags;
 277         __u32 ssf_length;
 278         __u32 ssf_error;
 279         struct sctp_sndrcvinfo ssf_info;
 280         sctp_assoc_t ssf_assoc_id;
 281         __u8 ssf_data[0];
 282 };
 283
 284 /*
 285  *   ssf_flags: 16 bits (unsigned integer)
 286  *
 287  *   The flag value will take one of the following values
 288  *
 289  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 290  *                       the wire.
 291  *
 292  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 293  *                       Note that this does not necessarily mean that the
 294  *                       data was (or was not) successfully delivered.
 295  */
 296 enum sctp_ssf_flags {
 297         SCTP_DATA_UNSENT,
 298         SCTP_DATA_SENT,
 299 };
 300
 301 /*
 302  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 303  *
 304  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 305  *   inform the application that it should cease sending data.
 306  */
 307 struct sctp_shutdown_event {
 308         __u16 sse_type;
 309         __u16 sse_flags;
 310         __u32 sse_length;
 311         sctp_assoc_t sse_assoc_id;
 312 };
 313
 314 /*
 315  * 5.3.1.6 SCTP_ADAPTATION_INDICATION
 316  *
 317  *   When a peer sends a Adaptation Layer Indication parameter , SCTP
 318  *   delivers this notification to inform the application
 319  *   that of the peers requested adaptation layer.
 320  */
 321 struct sctp_adaptation_event {
 322         __u16 sai_type;
 323         __u16 sai_flags;
 324         __u32 sai_length;
 325         __u32 sai_adaptation_ind;
 326         sctp_assoc_t sai_assoc_id;
 327 };
 328
 329 /*
 330  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 331  *
 332  *   When a receiver is engaged in a partial delivery of a
 333  *   message this notification will be used to indicate
 334  *   various events.
 335  */
 336 struct sctp_pdapi_event {
 337         __u16 pdapi_type;
 338         __u16 pdapi_flags;
 339         __u32 pdapi_length;
 340         __u32 pdapi_indication;
 341         sctp_assoc_t pdapi_assoc_id;
 342 };
 343
 344 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 345
 346 struct sctp_authkey_event {
 347         __u16 auth_type;
 348         __u16 auth_flags;
 349         __u32 auth_length;
 350         __u16 auth_keynumber;
 351         __u16 auth_altkeynumber;
 352         __u32 auth_indication;
 353         sctp_assoc_t auth_assoc_id;
 354 };
 355
 356 enum { SCTP_AUTH_NEWKEY = 0, };
 357
 358 /*
 359  * 6.1.9. SCTP_SENDER_DRY_EVENT
 360  *
 361  * When the SCTP stack has no more user data to send or retransmit, this
 362  * notification is given to the user. Also, at the time when a user app
 363  * subscribes to this event, if there is no data to be sent or
 364  * retransmit, the stack will immediately send up this notification.
 365  */
 366 struct sctp_sender_dry_event {
 367         __u16 sender_dry_type;
 368         __u16 sender_dry_flags;
 369         __u32 sender_dry_length;
 370         sctp_assoc_t sender_dry_assoc_id;
 371 };
 372
 373 /*
 374  * Described in Section 7.3
 375  *   Ancillary Data and Notification Interest Options
 376  */
 377 struct sctp_event_subscribe {
 378         __u8 sctp_data_io_event;
 379         __u8 sctp_association_event;
 380         __u8 sctp_address_event;
 381         __u8 sctp_send_failure_event;
 382         __u8 sctp_peer_error_event;
 383         __u8 sctp_shutdown_event;
 384         __u8 sctp_partial_delivery_event;
 385         __u8 sctp_adaptation_layer_event;
 386         __u8 sctp_authentication_event;
 387         __u8 sctp_sender_dry_event;
 388 };
 389
 390 /*
 391  * 5.3.1 SCTP Notification Structure
 392  *
 393  *   The notification structure is defined as the union of all
 394  *   notification types.
 395  *
 396  */
 397 union sctp_notification {
 398         struct {
 399                 __u16 sn_type;             /* Notification type. */
 400                 __u16 sn_flags;
 401                 __u32 sn_length;
 402         } sn_header;
 403         struct sctp_assoc_change sn_assoc_change;
 404         struct sctp_paddr_change sn_paddr_change;
 405         struct sctp_remote_error sn_remote_error;
 406         struct sctp_send_failed sn_send_failed;
 407         struct sctp_shutdown_event sn_shutdown_event;
 408         struct sctp_adaptation_event sn_adaptation_event;
 409         struct sctp_pdapi_event sn_pdapi_event;
 410         struct sctp_authkey_event sn_authkey_event;
 411         struct sctp_sender_dry_event sn_sender_dry_event;
 412 };
 413
 414 /* Section 5.3.1
 415  * All standard values for sn_type flags are greater than 2^15.
 416  * Values from 2^15 and down are reserved.
 417  */
 418
 419 enum sctp_sn_type {
 420         SCTP_SN_TYPE_BASE     = (1<<15),
 421         SCTP_ASSOC_CHANGE,
 422         SCTP_PEER_ADDR_CHANGE,
 423         SCTP_SEND_FAILED,
 424         SCTP_REMOTE_ERROR,
 425         SCTP_SHUTDOWN_EVENT,
 426         SCTP_PARTIAL_DELIVERY_EVENT,
 427         SCTP_ADAPTATION_INDICATION,
 428         SCTP_AUTHENTICATION_EVENT,
 429 #define SCTP_AUTHENTICATION_INDICATION  SCTP_AUTHENTICATION_EVENT
 430         SCTP_SENDER_DRY_EVENT,
 431 };
 432
 433 /* Notification error codes used to fill up the error fields in some
 434  * notifications.
 435  * SCTP_PEER_ADDRESS_CHAGE      : spc_error
 436  * SCTP_ASSOC_CHANGE            : sac_error
 437  * These names should be potentially included in the draft 04 of the SCTP
 438  * sockets API specification.
 439  */
 440 typedef enum sctp_sn_error {
 441         SCTP_FAILED_THRESHOLD,
 442         SCTP_RECEIVED_SACK,
 443         SCTP_HEARTBEAT_SUCCESS,
 444         SCTP_RESPONSE_TO_USER_REQ,
 445         SCTP_INTERNAL_ERROR,
 446         SCTP_SHUTDOWN_GUARD_EXPIRES,
 447         SCTP_PEER_FAULTY,
 448 } sctp_sn_error_t;
 449
 450 /*
 451  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 452  *
 453  *   The protocol parameters used to initialize and bound retransmission
 454  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 455  *   these parameters are used in RTO calculation.
 456  */
 457 struct sctp_rtoinfo {
 458         sctp_assoc_t    srto_assoc_id;
 459         __u32           srto_initial;
 460         __u32           srto_max;
 461         __u32           srto_min;
 462 };
 463
 464 /*
 465  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 466  *
 467  *   This option is used to both examine and set various association and
 468  *   endpoint parameters.
 469  */
 470 struct sctp_assocparams {
 471         sctp_assoc_t    sasoc_assoc_id;
 472         __u16           sasoc_asocmaxrxt;
 473         __u16           sasoc_number_peer_destinations;
 474         __u32           sasoc_peer_rwnd;
 475         __u32           sasoc_local_rwnd;
 476         __u32           sasoc_cookie_life;
 477 };
 478
 479 /*
 480  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 481  *
 482  *  Requests that the peer mark the enclosed address as the association
 483  *  primary. The enclosed address must be one of the association's
 484  *  locally bound addresses. The following structure is used to make a
 485  *   set primary request:
 486  */
 487 struct sctp_setpeerprim {
 488         sctp_assoc_t            sspp_assoc_id;
 489         struct sockaddr_storage sspp_addr;
 490 } __attribute__((packed, aligned(4)));
 491
 492 /*
 493  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 494  *
 495  *  Requests that the local SCTP stack use the enclosed peer address as
 496  *  the association primary. The enclosed address must be one of the
 497  *  association peer's addresses. The following structure is used to
 498  *  make a set peer primary request:
 499  */
 500 struct sctp_prim {
 501         sctp_assoc_t            ssp_assoc_id;
 502         struct sockaddr_storage ssp_addr;
 503 } __attribute__((packed, aligned(4)));
 504
 505 /*
 506  * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
 507  *
 508  * Requests that the local endpoint set the specified Adaptation Layer
 509  * Indication parameter for all future INIT and INIT-ACK exchanges.
 510  */
 511 struct sctp_setadaptation {
 512         __u32   ssb_adaptation_ind;
 513 };
 514
 515 /*
 516  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 517  *
 518  *   Applications can enable or disable heartbeats for any peer address
 519  *   of an association, modify an address's heartbeat interval, force a
 520  *   heartbeat to be sent immediately, and adjust the address's maximum
 521  *   number of retransmissions sent before an address is considered
 522  *   unreachable. The following structure is used to access and modify an
 523  *   address's parameters:
 524  */
 525 enum  sctp_spp_flags {
 526         SPP_HB_ENABLE = 1<<0,           /*Enable heartbeats*/
 527         SPP_HB_DISABLE = 1<<1,          /*Disable heartbeats*/
 528         SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
 529         SPP_HB_DEMAND = 1<<2,           /*Send heartbeat immediately*/
 530         SPP_PMTUD_ENABLE = 1<<3,        /*Enable PMTU discovery*/
 531         SPP_PMTUD_DISABLE = 1<<4,       /*Disable PMTU discovery*/
 532         SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
 533         SPP_SACKDELAY_ENABLE = 1<<5,    /*Enable SACK*/
 534         SPP_SACKDELAY_DISABLE = 1<<6,   /*Disable SACK*/
 535         SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
 536         SPP_HB_TIME_IS_ZERO = 1<<7,     /* Set HB delay to 0 */
 537 };
 538
 539 struct sctp_paddrparams {
 540         sctp_assoc_t            spp_assoc_id;
 541         struct sockaddr_storage spp_address;
 542         __u32                   spp_hbinterval;
 543         __u16                   spp_pathmaxrxt;
 544         __u32                   spp_pathmtu;
 545         __u32                   spp_sackdelay;
 546         __u32                   spp_flags;
 547 } __attribute__((packed, aligned(4)));
 548
 549 /*
 550  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 551  *
 552  * This set option adds a chunk type that the user is requesting to be
 553  * received only in an authenticated way.  Changes to the list of chunks
 554  * will only effect future associations on the socket.
 555  */
 556 struct sctp_authchunk {
 557         __u8            sauth_chunk;
 558 };
 559
 560 /*
 561  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 562  *
 563  * This option gets or sets the list of HMAC algorithms that the local
 564  * endpoint requires the peer to use.
 565 */
 566 struct sctp_hmacalgo {
 567         __u32           shmac_num_idents;
 568         __u16           shmac_idents[];
 569 };
 570
 571 /*
 572  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 573  *
 574  * This option will set a shared secret key which is used to build an
 575  * association shared key.
 576  */
 577 struct sctp_authkey {
 578         sctp_assoc_t    sca_assoc_id;
 579         __u16           sca_keynumber;
 580         __u16           sca_keylength;
 581         __u8            sca_key[];
 582 };
 583
 584 /*
 585  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 586  *
 587  * This option will get or set the active shared key to be used to build
 588  * the association shared key.
 589  */
 590
 591 struct sctp_authkeyid {
 592         sctp_assoc_t    scact_assoc_id;
 593         __u16           scact_keynumber;
 594 };
 595
 596
 597 /*
 598  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 599  *
 600  * This option will effect the way delayed acks are performed.  This
 601  * option allows you to get or set the delayed ack time, in
 602  * milliseconds.  It also allows changing the delayed ack frequency.
 603  * Changing the frequency to 1 disables the delayed sack algorithm.  If
 604  * the assoc_id is 0, then this sets or gets the endpoints default
 605  * values.  If the assoc_id field is non-zero, then the set or get
 606  * effects the specified association for the one to many model (the
 607  * assoc_id field is ignored by the one to one model).  Note that if
 608  * sack_delay or sack_freq are 0 when setting this option, then the
 609  * current values will remain unchanged.
 610  */
 611 struct sctp_sack_info {
 612         sctp_assoc_t    sack_assoc_id;
 613         uint32_t        sack_delay;
 614         uint32_t        sack_freq;
 615 };
 616
 617 struct sctp_assoc_value {
 618     sctp_assoc_t            assoc_id;
 619     uint32_t                assoc_value;
 620 };
 621
 622 /*
 623  * 7.2.2 Peer Address Information
 624  *
 625  *   Applications can retrieve information about a specific peer address
 626  *   of an association, including its reachability state, congestion
 627  *   window, and retransmission timer values.  This information is
 628  *   read-only. The following structure is used to access this
 629  *   information:
 630  */
 631 struct sctp_paddrinfo {
 632         sctp_assoc_t            spinfo_assoc_id;
 633         struct sockaddr_storage spinfo_address;
 634         __s32                   spinfo_state;
 635         __u32                   spinfo_cwnd;
 636         __u32                   spinfo_srtt;
 637         __u32                   spinfo_rto;
 638         __u32                   spinfo_mtu;
 639 } __attribute__((packed, aligned(4)));
 640
 641 /* Peer addresses's state. */
 642 /* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
 643  * calls.
 644  * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
 645  *              Not yet confirmed by a heartbeat and not available for data
 646  *              transfers.
 647  * ACTIVE : Peer address confirmed, active and available for data transfers.
 648  * INACTIVE: Peer address inactive and not available for data transfers.
 649  */
 650 enum sctp_spinfo_state {
 651         SCTP_INACTIVE,
 652         SCTP_ACTIVE,
 653         SCTP_UNCONFIRMED,
 654         SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 655 };
 656
 657 /*
 658  * 7.2.1 Association Status (SCTP_STATUS)
 659  *
 660  *   Applications can retrieve current status information about an
 661  *   association, including association state, peer receiver window size,
 662  *   number of unacked data chunks, and number of data chunks pending
 663  *   receipt.  This information is read-only.  The following structure is
 664  *   used to access this information:
 665  */
 666 struct sctp_status {
 667         sctp_assoc_t            sstat_assoc_id;
 668         __s32                   sstat_state;
 669         __u32                   sstat_rwnd;
 670         __u16                   sstat_unackdata;
 671         __u16                   sstat_penddata;
 672         __u16                   sstat_instrms;
 673         __u16                   sstat_outstrms;
 674         __u32                   sstat_fragmentation_point;
 675         struct sctp_paddrinfo   sstat_primary;
 676 };
 677
 678 /*
 679  * 7.2.3.  Get the list of chunks the peer requires to be authenticated
 680  *         (SCTP_PEER_AUTH_CHUNKS)
 681  *
 682  * This option gets a list of chunks for a specified association that
 683  * the peer requires to be received authenticated only.
 684  */
 685 struct sctp_authchunks {
 686         sctp_assoc_t    gauth_assoc_id;
 687         __u32           gauth_number_of_chunks;
 688         uint8_t         gauth_chunks[];
 689 };
 690
 691 /*
 692  * 8.2.6. Get the Current Identifiers of Associations
 693  *        (SCTP_GET_ASSOC_ID_LIST)
 694  *
 695  * This option gets the current list of SCTP association identifiers of
 696  * the SCTP associations handled by a one-to-many style socket.
 697  */
 698 struct sctp_assoc_ids {
 699         __u32           gaids_number_of_ids;
 700         sctp_assoc_t    gaids_assoc_id[];
 701 };
 702
 703 /*
 704  * 8.3, 8.5 get all peer/local addresses in an association.
 705  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
 706  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
 707  * sctp_getpaddrs() and sctp_getladdrs() API.
 708  */
 709 struct sctp_getaddrs_old {
 710         sctp_assoc_t            assoc_id;
 711         int                     addr_num;
 712         struct sockaddr         __user *addrs;
 713 };
 714 struct sctp_getaddrs {
 715         sctp_assoc_t            assoc_id; /*input*/
 716         __u32                   addr_num; /*output*/
 717         __u8                    addrs[0]; /*output, variable size*/
 718 };
 719
 720 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
 721 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
 722 enum sctp_msg_flags {
 723         MSG_NOTIFICATION = 0x8000,
 724 #define MSG_NOTIFICATION MSG_NOTIFICATION
 725 };
 726
 727 /*
 728  * 8.1 sctp_bindx()
 729  *
 730  * The flags parameter is formed from the bitwise OR of zero or more of the
 731  * following currently defined flags:
 732  */
 733 #define SCTP_BINDX_ADD_ADDR 0x01
 734 #define SCTP_BINDX_REM_ADDR 0x02
 735
 736 /* This is the structure that is passed as an argument(optval) to
 737  * getsockopt(SCTP_SOCKOPT_PEELOFF).
 738  */
 739 typedef struct {
 740         sctp_assoc_t associd;
 741         int sd;
 742 } sctp_peeloff_arg_t;
 743
 744 #endif /* __net_sctp_user_h__ */