include/uapi/linux/sctp.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /* SCTP kernel implementation
   3  * (C) Copyright IBM Corp. 2001, 2004
   4  * Copyright (c) 1999-2000 Cisco, Inc.
   5  * Copyright (c) 1999-2001 Motorola, Inc.
   6  * Copyright (c) 2002 Intel Corp.
   7  *
   8  * This file is part of the SCTP kernel implementation
   9  *
  10  * This header represents the structures and constants needed to support
  11  * the SCTP Extension to the Sockets API.
  12  *
  13  * This SCTP implementation is free software;
  14  * you can redistribute it and/or modify it under the terms of
  15  * the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This SCTP implementation is distributed in the hope that it
  20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  21  *                 ************************
  22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  23  * See the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with GNU CC; see the file COPYING.  If not, see
  27  * <http://www.gnu.org/licenses/>.
  28  *
  29  * Please send any bug reports or fixes you make to the
  30  * email address(es):
  31  *    lksctp developers <linux-sctp@vger.kernel.org>
  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  *    Inaky Perez-Gonzalez     <inaky.gonzalez@intel.com>
  48  *    Vlad Yasevich            <vladislav.yasevich@hp.com>
  49  *
  50  * Any bugs reported given to us we will try to fix... any fixes shared will
  51  * be incorporated into the next SCTP release.
  52  */
  53
  54 #ifndef _UAPI_SCTP_H
  55 #define _UAPI_SCTP_H
  56
  57 #include <linux/types.h>
  58 #include <linux/socket.h>
  59
  60 typedef __s32 sctp_assoc_t;
  61
  62 #define SCTP_FUTURE_ASSOC       0
  63 #define SCTP_CURRENT_ASSOC      1
  64 #define SCTP_ALL_ASSOC          2
  65
  66 /* The following symbols come from the Sockets API Extensions for
  67  * SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
  68  */
  69 #define SCTP_RTOINFO    0
  70 #define SCTP_ASSOCINFO  1
  71 #define SCTP_INITMSG    2
  72 #define SCTP_NODELAY    3               /* Get/set nodelay option. */
  73 #define SCTP_AUTOCLOSE  4
  74 #define SCTP_SET_PEER_PRIMARY_ADDR 5
  75 #define SCTP_PRIMARY_ADDR       6
  76 #define SCTP_ADAPTATION_LAYER   7
  77 #define SCTP_DISABLE_FRAGMENTS  8
  78 #define SCTP_PEER_ADDR_PARAMS   9
  79 #define SCTP_DEFAULT_SEND_PARAM 10
  80 #define SCTP_EVENTS     11
  81 #define SCTP_I_WANT_MAPPED_V4_ADDR 12   /* Turn on/off mapped v4 addresses  */
  82 #define SCTP_MAXSEG     13              /* Get/set maximum fragment. */
  83 #define SCTP_STATUS     14
  84 #define SCTP_GET_PEER_ADDR_INFO 15
  85 #define SCTP_DELAYED_ACK_TIME   16
  86 #define SCTP_DELAYED_ACK SCTP_DELAYED_ACK_TIME
  87 #define SCTP_DELAYED_SACK SCTP_DELAYED_ACK_TIME
  88 #define SCTP_CONTEXT    17
  89 #define SCTP_FRAGMENT_INTERLEAVE        18
  90 #define SCTP_PARTIAL_DELIVERY_POINT     19 /* Set/Get partial delivery point */
  91 #define SCTP_MAX_BURST  20              /* Set/Get max burst */
  92 #define SCTP_AUTH_CHUNK 21      /* Set only: add a chunk type to authenticate */
  93 #define SCTP_HMAC_IDENT 22
  94 #define SCTP_AUTH_KEY   23
  95 #define SCTP_AUTH_ACTIVE_KEY    24
  96 #define SCTP_AUTH_DELETE_KEY    25
  97 #define SCTP_PEER_AUTH_CHUNKS   26      /* Read only */
  98 #define SCTP_LOCAL_AUTH_CHUNKS  27      /* Read only */
  99 #define SCTP_GET_ASSOC_NUMBER   28      /* Read only */
 100 #define SCTP_GET_ASSOC_ID_LIST  29      /* Read only */
 101 #define SCTP_AUTO_ASCONF       30
 102 #define SCTP_PEER_ADDR_THLDS    31
 103 #define SCTP_RECVRCVINFO        32
 104 #define SCTP_RECVNXTINFO        33
 105 #define SCTP_DEFAULT_SNDINFO    34
 106 #define SCTP_AUTH_DEACTIVATE_KEY        35
 107 #define SCTP_REUSE_PORT         36
 108 #define SCTP_PEER_ADDR_THLDS_V2 37
 109
 110 /* Internal Socket Options. Some of the sctp library functions are
 111  * implemented using these socket options.
 112  */
 113 #define SCTP_SOCKOPT_BINDX_ADD  100     /* BINDX requests for adding addrs */
 114 #define SCTP_SOCKOPT_BINDX_REM  101     /* BINDX requests for removing addrs. */
 115 #define SCTP_SOCKOPT_PEELOFF    102     /* peel off association. */
 116 /* Options 104-106 are deprecated and removed. Do not use this space */
 117 #define SCTP_SOCKOPT_CONNECTX_OLD       107     /* CONNECTX old requests. */
 118 #define SCTP_GET_PEER_ADDRS     108             /* Get all peer address. */
 119 #define SCTP_GET_LOCAL_ADDRS    109             /* Get all local address. */
 120 #define SCTP_SOCKOPT_CONNECTX   110             /* CONNECTX requests. */
 121 #define SCTP_SOCKOPT_CONNECTX3  111     /* CONNECTX requests (updated) */
 122 #define SCTP_GET_ASSOC_STATS    112     /* Read only */
 123 #define SCTP_PR_SUPPORTED       113
 124 #define SCTP_DEFAULT_PRINFO     114
 125 #define SCTP_PR_ASSOC_STATUS    115
 126 #define SCTP_PR_STREAM_STATUS   116
 127 #define SCTP_RECONFIG_SUPPORTED 117
 128 #define SCTP_ENABLE_STREAM_RESET        118
 129 #define SCTP_RESET_STREAMS      119
 130 #define SCTP_RESET_ASSOC        120
 131 #define SCTP_ADD_STREAMS        121
 132 #define SCTP_SOCKOPT_PEELOFF_FLAGS 122
 133 #define SCTP_STREAM_SCHEDULER   123
 134 #define SCTP_STREAM_SCHEDULER_VALUE     124
 135 #define SCTP_INTERLEAVING_SUPPORTED     125
 136 #define SCTP_SENDMSG_CONNECT    126
 137 #define SCTP_EVENT      127
 138 #define SCTP_ASCONF_SUPPORTED   128
 139 #define SCTP_AUTH_SUPPORTED     129
 140 #define SCTP_ECN_SUPPORTED      130
 141 #define SCTP_EXPOSE_POTENTIALLY_FAILED_STATE    131
 142 #define SCTP_EXPOSE_PF_STATE    SCTP_EXPOSE_POTENTIALLY_FAILED_STATE
 143 #define SCTP_REMOTE_UDP_ENCAPS_PORT     132
 144 #define SCTP_PLPMTUD_PROBE_INTERVAL     133
 145
 146 /* PR-SCTP policies */
 147 #define SCTP_PR_SCTP_NONE       0x0000
 148 #define SCTP_PR_SCTP_TTL        0x0010
 149 #define SCTP_PR_SCTP_RTX        0x0020
 150 #define SCTP_PR_SCTP_PRIO       0x0030
 151 #define SCTP_PR_SCTP_MAX        SCTP_PR_SCTP_PRIO
 152 #define SCTP_PR_SCTP_MASK       0x0030
 153
 154 #define __SCTP_PR_INDEX(x)      ((x >> 4) - 1)
 155 #define SCTP_PR_INDEX(x)        __SCTP_PR_INDEX(SCTP_PR_SCTP_ ## x)
 156
 157 #define SCTP_PR_POLICY(x)       ((x) & SCTP_PR_SCTP_MASK)
 158 #define SCTP_PR_SET_POLICY(flags, x)    \
 159         do {                            \
 160                 flags &= ~SCTP_PR_SCTP_MASK;    \
 161                 flags |= x;             \
 162         } while (0)
 163
 164 #define SCTP_PR_TTL_ENABLED(x)  (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_TTL)
 165 #define SCTP_PR_RTX_ENABLED(x)  (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_RTX)
 166 #define SCTP_PR_PRIO_ENABLED(x) (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_PRIO)
 167
 168 /* For enable stream reset */
 169 #define SCTP_ENABLE_RESET_STREAM_REQ    0x01
 170 #define SCTP_ENABLE_RESET_ASSOC_REQ     0x02
 171 #define SCTP_ENABLE_CHANGE_ASSOC_REQ    0x04
 172 #define SCTP_ENABLE_STRRESET_MASK       0x07
 173
 174 #define SCTP_STREAM_RESET_INCOMING      0x01
 175 #define SCTP_STREAM_RESET_OUTGOING      0x02
 176
 177 /* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
 178 /* On user space Linux, these live in <bits/socket.h> as an enum.  */
 179 enum sctp_msg_flags {
 180         MSG_NOTIFICATION = 0x8000,
 181 #define MSG_NOTIFICATION MSG_NOTIFICATION
 182 };
 183
 184 /* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
 185  *
 186  *   This cmsghdr structure provides information for initializing new
 187  *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 188  *   uses this same data structure.  This structure is not used for
 189  *   recvmsg().
 190  *
 191  *   cmsg_level    cmsg_type      cmsg_data[]
 192  *   ------------  ------------   ----------------------
 193  *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 194  */
 195 struct sctp_initmsg {
 196         __u16 sinit_num_ostreams;
 197         __u16 sinit_max_instreams;
 198         __u16 sinit_max_attempts;
 199         __u16 sinit_max_init_timeo;
 200 };
 201
 202 /* 5.3.2 SCTP Header Information Structure (SCTP_SNDRCV)
 203  *
 204  *   This cmsghdr structure specifies SCTP options for sendmsg() and
 205  *   describes SCTP header information about a received message through
 206  *   recvmsg().
 207  *
 208  *   cmsg_level    cmsg_type      cmsg_data[]
 209  *   ------------  ------------   ----------------------
 210  *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 211  */
 212 struct sctp_sndrcvinfo {
 213         __u16 sinfo_stream;
 214         __u16 sinfo_ssn;
 215         __u16 sinfo_flags;
 216         __u32 sinfo_ppid;
 217         __u32 sinfo_context;
 218         __u32 sinfo_timetolive;
 219         __u32 sinfo_tsn;
 220         __u32 sinfo_cumtsn;
 221         sctp_assoc_t sinfo_assoc_id;
 222 };
 223
 224 /* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
 225  *
 226  *   This cmsghdr structure specifies SCTP options for sendmsg().
 227  *
 228  *   cmsg_level    cmsg_type      cmsg_data[]
 229  *   ------------  ------------   -------------------
 230  *   IPPROTO_SCTP  SCTP_SNDINFO   struct sctp_sndinfo
 231  */
 232 struct sctp_sndinfo {
 233         __u16 snd_sid;
 234         __u16 snd_flags;
 235         __u32 snd_ppid;
 236         __u32 snd_context;
 237         sctp_assoc_t snd_assoc_id;
 238 };
 239
 240 /* 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
 241  *
 242  *   This cmsghdr structure describes SCTP receive information
 243  *   about a received message through recvmsg().
 244  *
 245  *   cmsg_level    cmsg_type      cmsg_data[]
 246  *   ------------  ------------   -------------------
 247  *   IPPROTO_SCTP  SCTP_RCVINFO   struct sctp_rcvinfo
 248  */
 249 struct sctp_rcvinfo {
 250         __u16 rcv_sid;
 251         __u16 rcv_ssn;
 252         __u16 rcv_flags;
 253         __u32 rcv_ppid;
 254         __u32 rcv_tsn;
 255         __u32 rcv_cumtsn;
 256         __u32 rcv_context;
 257         sctp_assoc_t rcv_assoc_id;
 258 };
 259
 260 /* 5.3.6 SCTP Next Receive Information Structure (SCTP_NXTINFO)
 261  *
 262  *   This cmsghdr structure describes SCTP receive information
 263  *   of the next message that will be delivered through recvmsg()
 264  *   if this information is already available when delivering
 265  *   the current message.
 266  *
 267  *   cmsg_level    cmsg_type      cmsg_data[]
 268  *   ------------  ------------   -------------------
 269  *   IPPROTO_SCTP  SCTP_NXTINFO   struct sctp_nxtinfo
 270  */
 271 struct sctp_nxtinfo {
 272         __u16 nxt_sid;
 273         __u16 nxt_flags;
 274         __u32 nxt_ppid;
 275         __u32 nxt_length;
 276         sctp_assoc_t nxt_assoc_id;
 277 };
 278
 279 /* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
 280  *
 281  *   This cmsghdr structure specifies SCTP options for sendmsg().
 282  *
 283  *   cmsg_level    cmsg_type      cmsg_data[]
 284  *   ------------  ------------   -------------------
 285  *   IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
 286  */
 287 struct sctp_prinfo {
 288         __u16 pr_policy;
 289         __u32 pr_value;
 290 };
 291
 292 /* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
 293  *
 294  *   This cmsghdr structure specifies SCTP options for sendmsg().
 295  *
 296  *   cmsg_level    cmsg_type      cmsg_data[]
 297  *   ------------  ------------   -------------------
 298  *   IPPROTO_SCTP  SCTP_AUTHINFO  struct sctp_authinfo
 299  */
 300 struct sctp_authinfo {
 301         __u16 auth_keynumber;
 302 };
 303
 304 /*
 305  *  sinfo_flags: 16 bits (unsigned integer)
 306  *
 307  *   This field may contain any of the following flags and is composed of
 308  *   a bitwise OR of these values.
 309  */
 310 enum sctp_sinfo_flags {
 311         SCTP_UNORDERED          = (1 << 0), /* Send/receive message unordered. */
 312         SCTP_ADDR_OVER          = (1 << 1), /* Override the primary destination. */
 313         SCTP_ABORT              = (1 << 2), /* Send an ABORT message to the peer. */
 314         SCTP_SACK_IMMEDIATELY   = (1 << 3), /* SACK should be sent without delay. */
 315         /* 2 bits here have been used by SCTP_PR_SCTP_MASK */
 316         SCTP_SENDALL            = (1 << 6),
 317         SCTP_PR_SCTP_ALL        = (1 << 7),
 318         SCTP_NOTIFICATION       = MSG_NOTIFICATION, /* Next message is not user msg but notification. */
 319         SCTP_EOF                = MSG_FIN,  /* Initiate graceful shutdown process. */
 320 };
 321
 322 typedef union {
 323         __u8                    raw;
 324         struct sctp_initmsg     init;
 325         struct sctp_sndrcvinfo  sndrcv;
 326 } sctp_cmsg_data_t;
 327
 328 /* These are cmsg_types.  */
 329 typedef enum sctp_cmsg_type {
 330         SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
 331 #define SCTP_INIT       SCTP_INIT
 332         SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
 333 #define SCTP_SNDRCV     SCTP_SNDRCV
 334         SCTP_SNDINFO,           /* 5.3.4 SCTP Send Information Structure */
 335 #define SCTP_SNDINFO    SCTP_SNDINFO
 336         SCTP_RCVINFO,           /* 5.3.5 SCTP Receive Information Structure */
 337 #define SCTP_RCVINFO    SCTP_RCVINFO
 338         SCTP_NXTINFO,           /* 5.3.6 SCTP Next Receive Information Structure */
 339 #define SCTP_NXTINFO    SCTP_NXTINFO
 340         SCTP_PRINFO,            /* 5.3.7 SCTP PR-SCTP Information Structure */
 341 #define SCTP_PRINFO     SCTP_PRINFO
 342         SCTP_AUTHINFO,          /* 5.3.8 SCTP AUTH Information Structure */
 343 #define SCTP_AUTHINFO   SCTP_AUTHINFO
 344         SCTP_DSTADDRV4,         /* 5.3.9 SCTP Destination IPv4 Address Structure */
 345 #define SCTP_DSTADDRV4  SCTP_DSTADDRV4
 346         SCTP_DSTADDRV6,         /* 5.3.10 SCTP Destination IPv6 Address Structure */
 347 #define SCTP_DSTADDRV6  SCTP_DSTADDRV6
 348 } sctp_cmsg_t;
 349
 350 /*
 351  * 5.3.1.1 SCTP_ASSOC_CHANGE
 352  *
 353  *   Communication notifications inform the ULP that an SCTP association
 354  *   has either begun or ended. The identifier for a new association is
 355  *   provided by this notificaion. The notification information has the
 356  *   following format:
 357  *
 358  */
 359 struct sctp_assoc_change {
 360         __u16 sac_type;
 361         __u16 sac_flags;
 362         __u32 sac_length;
 363         __u16 sac_state;
 364         __u16 sac_error;
 365         __u16 sac_outbound_streams;
 366         __u16 sac_inbound_streams;
 367         sctp_assoc_t sac_assoc_id;
 368         __u8 sac_info[];
 369 };
 370
 371 /*
 372  *   sac_state: 32 bits (signed integer)
 373  *
 374  *   This field holds one of a number of values that communicate the
 375  *   event that happened to the association.  They include:
 376  *
 377  *   Note:  The following state names deviate from the API draft as
 378  *   the names clash too easily with other kernel symbols.
 379  */
 380 enum sctp_sac_state {
 381         SCTP_COMM_UP,
 382         SCTP_COMM_LOST,
 383         SCTP_RESTART,
 384         SCTP_SHUTDOWN_COMP,
 385         SCTP_CANT_STR_ASSOC,
 386 };
 387
 388 /*
 389  * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 390  *
 391  *   When a destination address on a multi-homed peer encounters a change
 392  *   an interface details event is sent.  The information has the
 393  *   following structure:
 394  */
 395 struct sctp_paddr_change {
 396         __u16 spc_type;
 397         __u16 spc_flags;
 398         __u32 spc_length;
 399         struct sockaddr_storage spc_aaddr;
 400         int spc_state;
 401         int spc_error;
 402         sctp_assoc_t spc_assoc_id;
 403 } __attribute__((packed, aligned(4)));
 404
 405 /*
 406  *    spc_state:  32 bits (signed integer)
 407  *
 408  *   This field holds one of a number of values that communicate the
 409  *   event that happened to the address.  They include:
 410  */
 411 enum sctp_spc_state {
 412         SCTP_ADDR_AVAILABLE,
 413         SCTP_ADDR_UNREACHABLE,
 414         SCTP_ADDR_REMOVED,
 415         SCTP_ADDR_ADDED,
 416         SCTP_ADDR_MADE_PRIM,
 417         SCTP_ADDR_CONFIRMED,
 418         SCTP_ADDR_POTENTIALLY_FAILED,
 419 #define SCTP_ADDR_PF    SCTP_ADDR_POTENTIALLY_FAILED
 420 };
 421
 422
 423 /*
 424  * 5.3.1.3 SCTP_REMOTE_ERROR
 425  *
 426  *   A remote peer may send an Operational Error message to its peer.
 427  *   This message indicates a variety of error conditions on an
 428  *   association. The entire error TLV as it appears on the wire is
 429  *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 430  *   specification [SCTP] and any extensions for a list of possible
 431  *   error formats. SCTP error TLVs have the format:
 432  */
 433 struct sctp_remote_error {
 434         __u16 sre_type;
 435         __u16 sre_flags;
 436         __u32 sre_length;
 437         __be16 sre_error;
 438         sctp_assoc_t sre_assoc_id;
 439         __u8 sre_data[];
 440 };
 441
 442
 443 /*
 444  * 5.3.1.4 SCTP_SEND_FAILED
 445  *
 446  *   If SCTP cannot deliver a message it may return the message as a
 447  *   notification.
 448  */
 449 struct sctp_send_failed {
 450         __u16 ssf_type;
 451         __u16 ssf_flags;
 452         __u32 ssf_length;
 453         __u32 ssf_error;
 454         struct sctp_sndrcvinfo ssf_info;
 455         sctp_assoc_t ssf_assoc_id;
 456         __u8 ssf_data[];
 457 };
 458
 459 struct sctp_send_failed_event {
 460         __u16 ssf_type;
 461         __u16 ssf_flags;
 462         __u32 ssf_length;
 463         __u32 ssf_error;
 464         struct sctp_sndinfo ssfe_info;
 465         sctp_assoc_t ssf_assoc_id;
 466         __u8 ssf_data[];
 467 };
 468
 469 /*
 470  *   ssf_flags: 16 bits (unsigned integer)
 471  *
 472  *   The flag value will take one of the following values
 473  *
 474  *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 475  *                       the wire.
 476  *
 477  *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 478  *                       Note that this does not necessarily mean that the
 479  *                       data was (or was not) successfully delivered.
 480  */
 481 enum sctp_ssf_flags {
 482         SCTP_DATA_UNSENT,
 483         SCTP_DATA_SENT,
 484 };
 485
 486 /*
 487  * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 488  *
 489  *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 490  *   inform the application that it should cease sending data.
 491  */
 492 struct sctp_shutdown_event {
 493         __u16 sse_type;
 494         __u16 sse_flags;
 495         __u32 sse_length;
 496         sctp_assoc_t sse_assoc_id;
 497 };
 498
 499 /*
 500  * 5.3.1.6 SCTP_ADAPTATION_INDICATION
 501  *
 502  *   When a peer sends a Adaptation Layer Indication parameter , SCTP
 503  *   delivers this notification to inform the application
 504  *   that of the peers requested adaptation layer.
 505  */
 506 struct sctp_adaptation_event {
 507         __u16 sai_type;
 508         __u16 sai_flags;
 509         __u32 sai_length;
 510         __u32 sai_adaptation_ind;
 511         sctp_assoc_t sai_assoc_id;
 512 };
 513
 514 /*
 515  * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 516  *
 517  *   When a receiver is engaged in a partial delivery of a
 518  *   message this notification will be used to indicate
 519  *   various events.
 520  */
 521 struct sctp_pdapi_event {
 522         __u16 pdapi_type;
 523         __u16 pdapi_flags;
 524         __u32 pdapi_length;
 525         __u32 pdapi_indication;
 526         sctp_assoc_t pdapi_assoc_id;
 527         __u32 pdapi_stream;
 528         __u32 pdapi_seq;
 529 };
 530
 531 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 532
 533 /*
 534  * 5.3.1.8.  SCTP_AUTHENTICATION_EVENT
 535  *
 536  *  When a receiver is using authentication this message will provide
 537  *  notifications regarding new keys being made active as well as errors.
 538  */
 539 struct sctp_authkey_event {
 540         __u16 auth_type;
 541         __u16 auth_flags;
 542         __u32 auth_length;
 543         __u16 auth_keynumber;
 544         __u16 auth_altkeynumber;
 545         __u32 auth_indication;
 546         sctp_assoc_t auth_assoc_id;
 547 };
 548
 549 enum {
 550         SCTP_AUTH_NEW_KEY,
 551 #define SCTP_AUTH_NEWKEY        SCTP_AUTH_NEW_KEY /* compatible with before */
 552         SCTP_AUTH_FREE_KEY,
 553         SCTP_AUTH_NO_AUTH,
 554 };
 555
 556 /*
 557  * 6.1.9. SCTP_SENDER_DRY_EVENT
 558  *
 559  * When the SCTP stack has no more user data to send or retransmit, this
 560  * notification is given to the user. Also, at the time when a user app
 561  * subscribes to this event, if there is no data to be sent or
 562  * retransmit, the stack will immediately send up this notification.
 563  */
 564 struct sctp_sender_dry_event {
 565         __u16 sender_dry_type;
 566         __u16 sender_dry_flags;
 567         __u32 sender_dry_length;
 568         sctp_assoc_t sender_dry_assoc_id;
 569 };
 570
 571 #define SCTP_STREAM_RESET_INCOMING_SSN  0x0001
 572 #define SCTP_STREAM_RESET_OUTGOING_SSN  0x0002
 573 #define SCTP_STREAM_RESET_DENIED        0x0004
 574 #define SCTP_STREAM_RESET_FAILED        0x0008
 575 struct sctp_stream_reset_event {
 576         __u16 strreset_type;
 577         __u16 strreset_flags;
 578         __u32 strreset_length;
 579         sctp_assoc_t strreset_assoc_id;
 580         __u16 strreset_stream_list[];
 581 };
 582
 583 #define SCTP_ASSOC_RESET_DENIED         0x0004
 584 #define SCTP_ASSOC_RESET_FAILED         0x0008
 585 struct sctp_assoc_reset_event {
 586         __u16 assocreset_type;
 587         __u16 assocreset_flags;
 588         __u32 assocreset_length;
 589         sctp_assoc_t assocreset_assoc_id;
 590         __u32 assocreset_local_tsn;
 591         __u32 assocreset_remote_tsn;
 592 };
 593
 594 #define SCTP_ASSOC_CHANGE_DENIED        0x0004
 595 #define SCTP_ASSOC_CHANGE_FAILED        0x0008
 596 #define SCTP_STREAM_CHANGE_DENIED       SCTP_ASSOC_CHANGE_DENIED
 597 #define SCTP_STREAM_CHANGE_FAILED       SCTP_ASSOC_CHANGE_FAILED
 598 struct sctp_stream_change_event {
 599         __u16 strchange_type;
 600         __u16 strchange_flags;
 601         __u32 strchange_length;
 602         sctp_assoc_t strchange_assoc_id;
 603         __u16 strchange_instrms;
 604         __u16 strchange_outstrms;
 605 };
 606
 607 /*
 608  * Described in Section 7.3
 609  *   Ancillary Data and Notification Interest Options
 610  */
 611 struct sctp_event_subscribe {
 612         __u8 sctp_data_io_event;
 613         __u8 sctp_association_event;
 614         __u8 sctp_address_event;
 615         __u8 sctp_send_failure_event;
 616         __u8 sctp_peer_error_event;
 617         __u8 sctp_shutdown_event;
 618         __u8 sctp_partial_delivery_event;
 619         __u8 sctp_adaptation_layer_event;
 620         __u8 sctp_authentication_event;
 621         __u8 sctp_sender_dry_event;
 622         __u8 sctp_stream_reset_event;
 623         __u8 sctp_assoc_reset_event;
 624         __u8 sctp_stream_change_event;
 625         __u8 sctp_send_failure_event_event;
 626 };
 627
 628 /*
 629  * 5.3.1 SCTP Notification Structure
 630  *
 631  *   The notification structure is defined as the union of all
 632  *   notification types.
 633  *
 634  */
 635 union sctp_notification {
 636         struct {
 637                 __u16 sn_type;             /* Notification type. */
 638                 __u16 sn_flags;
 639                 __u32 sn_length;
 640         } sn_header;
 641         struct sctp_assoc_change sn_assoc_change;
 642         struct sctp_paddr_change sn_paddr_change;
 643         struct sctp_remote_error sn_remote_error;
 644         struct sctp_send_failed sn_send_failed;
 645         struct sctp_shutdown_event sn_shutdown_event;
 646         struct sctp_adaptation_event sn_adaptation_event;
 647         struct sctp_pdapi_event sn_pdapi_event;
 648         struct sctp_authkey_event sn_authkey_event;
 649         struct sctp_sender_dry_event sn_sender_dry_event;
 650         struct sctp_stream_reset_event sn_strreset_event;
 651         struct sctp_assoc_reset_event sn_assocreset_event;
 652         struct sctp_stream_change_event sn_strchange_event;
 653         struct sctp_send_failed_event sn_send_failed_event;
 654 };
 655
 656 /* Section 5.3.1
 657  * All standard values for sn_type flags are greater than 2^15.
 658  * Values from 2^15 and down are reserved.
 659  */
 660
 661 enum sctp_sn_type {
 662         SCTP_SN_TYPE_BASE       = (1<<15),
 663         SCTP_DATA_IO_EVENT      = SCTP_SN_TYPE_BASE,
 664 #define SCTP_DATA_IO_EVENT              SCTP_DATA_IO_EVENT
 665         SCTP_ASSOC_CHANGE,
 666 #define SCTP_ASSOC_CHANGE               SCTP_ASSOC_CHANGE
 667         SCTP_PEER_ADDR_CHANGE,
 668 #define SCTP_PEER_ADDR_CHANGE           SCTP_PEER_ADDR_CHANGE
 669         SCTP_SEND_FAILED,
 670 #define SCTP_SEND_FAILED                SCTP_SEND_FAILED
 671         SCTP_REMOTE_ERROR,
 672 #define SCTP_REMOTE_ERROR               SCTP_REMOTE_ERROR
 673         SCTP_SHUTDOWN_EVENT,
 674 #define SCTP_SHUTDOWN_EVENT             SCTP_SHUTDOWN_EVENT
 675         SCTP_PARTIAL_DELIVERY_EVENT,
 676 #define SCTP_PARTIAL_DELIVERY_EVENT     SCTP_PARTIAL_DELIVERY_EVENT
 677         SCTP_ADAPTATION_INDICATION,
 678 #define SCTP_ADAPTATION_INDICATION      SCTP_ADAPTATION_INDICATION
 679         SCTP_AUTHENTICATION_EVENT,
 680 #define SCTP_AUTHENTICATION_INDICATION  SCTP_AUTHENTICATION_EVENT
 681         SCTP_SENDER_DRY_EVENT,
 682 #define SCTP_SENDER_DRY_EVENT           SCTP_SENDER_DRY_EVENT
 683         SCTP_STREAM_RESET_EVENT,
 684 #define SCTP_STREAM_RESET_EVENT         SCTP_STREAM_RESET_EVENT
 685         SCTP_ASSOC_RESET_EVENT,
 686 #define SCTP_ASSOC_RESET_EVENT          SCTP_ASSOC_RESET_EVENT
 687         SCTP_STREAM_CHANGE_EVENT,
 688 #define SCTP_STREAM_CHANGE_EVENT        SCTP_STREAM_CHANGE_EVENT
 689         SCTP_SEND_FAILED_EVENT,
 690 #define SCTP_SEND_FAILED_EVENT          SCTP_SEND_FAILED_EVENT
 691         SCTP_SN_TYPE_MAX        = SCTP_SEND_FAILED_EVENT,
 692 #define SCTP_SN_TYPE_MAX                SCTP_SN_TYPE_MAX
 693 };
 694
 695 /* Notification error codes used to fill up the error fields in some
 696  * notifications.
 697  * SCTP_PEER_ADDRESS_CHAGE      : spc_error
 698  * SCTP_ASSOC_CHANGE            : sac_error
 699  * These names should be potentially included in the draft 04 of the SCTP
 700  * sockets API specification.
 701  */
 702 typedef enum sctp_sn_error {
 703         SCTP_FAILED_THRESHOLD,
 704         SCTP_RECEIVED_SACK,
 705         SCTP_HEARTBEAT_SUCCESS,
 706         SCTP_RESPONSE_TO_USER_REQ,
 707         SCTP_INTERNAL_ERROR,
 708         SCTP_SHUTDOWN_GUARD_EXPIRES,
 709         SCTP_PEER_FAULTY,
 710 } sctp_sn_error_t;
 711
 712 /*
 713  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 714  *
 715  *   The protocol parameters used to initialize and bound retransmission
 716  *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 717  *   these parameters are used in RTO calculation.
 718  */
 719 struct sctp_rtoinfo {
 720         sctp_assoc_t    srto_assoc_id;
 721         __u32           srto_initial;
 722         __u32           srto_max;
 723         __u32           srto_min;
 724 };
 725
 726 /*
 727  * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 728  *
 729  *   This option is used to both examine and set various association and
 730  *   endpoint parameters.
 731  */
 732 struct sctp_assocparams {
 733         sctp_assoc_t    sasoc_assoc_id;
 734         __u16           sasoc_asocmaxrxt;
 735         __u16           sasoc_number_peer_destinations;
 736         __u32           sasoc_peer_rwnd;
 737         __u32           sasoc_local_rwnd;
 738         __u32           sasoc_cookie_life;
 739 };
 740
 741 /*
 742  * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 743  *
 744  *  Requests that the peer mark the enclosed address as the association
 745  *  primary. The enclosed address must be one of the association's
 746  *  locally bound addresses. The following structure is used to make a
 747  *   set primary request:
 748  */
 749 struct sctp_setpeerprim {
 750         sctp_assoc_t            sspp_assoc_id;
 751         struct sockaddr_storage sspp_addr;
 752 } __attribute__((packed, aligned(4)));
 753
 754 /*
 755  * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 756  *
 757  *  Requests that the local SCTP stack use the enclosed peer address as
 758  *  the association primary. The enclosed address must be one of the
 759  *  association peer's addresses. The following structure is used to
 760  *  make a set peer primary request:
 761  */
 762 struct sctp_prim {
 763         sctp_assoc_t            ssp_assoc_id;
 764         struct sockaddr_storage ssp_addr;
 765 } __attribute__((packed, aligned(4)));
 766
 767 /* For backward compatibility use, define the old name too */
 768 #define sctp_setprim    sctp_prim
 769
 770 /*
 771  * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
 772  *
 773  * Requests that the local endpoint set the specified Adaptation Layer
 774  * Indication parameter for all future INIT and INIT-ACK exchanges.
 775  */
 776 struct sctp_setadaptation {
 777         __u32   ssb_adaptation_ind;
 778 };
 779
 780 /*
 781  * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 782  *
 783  *   Applications can enable or disable heartbeats for any peer address
 784  *   of an association, modify an address's heartbeat interval, force a
 785  *   heartbeat to be sent immediately, and adjust the address's maximum
 786  *   number of retransmissions sent before an address is considered
 787  *   unreachable. The following structure is used to access and modify an
 788  *   address's parameters:
 789  */
 790 enum  sctp_spp_flags {
 791         SPP_HB_ENABLE = 1<<0,           /*Enable heartbeats*/
 792         SPP_HB_DISABLE = 1<<1,          /*Disable heartbeats*/
 793         SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
 794         SPP_HB_DEMAND = 1<<2,           /*Send heartbeat immediately*/
 795         SPP_PMTUD_ENABLE = 1<<3,        /*Enable PMTU discovery*/
 796         SPP_PMTUD_DISABLE = 1<<4,       /*Disable PMTU discovery*/
 797         SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
 798         SPP_SACKDELAY_ENABLE = 1<<5,    /*Enable SACK*/
 799         SPP_SACKDELAY_DISABLE = 1<<6,   /*Disable SACK*/
 800         SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
 801         SPP_HB_TIME_IS_ZERO = 1<<7,     /* Set HB delay to 0 */
 802         SPP_IPV6_FLOWLABEL = 1<<8,
 803         SPP_DSCP = 1<<9,
 804 };
 805
 806 struct sctp_paddrparams {
 807         sctp_assoc_t            spp_assoc_id;
 808         struct sockaddr_storage spp_address;
 809         __u32                   spp_hbinterval;
 810         __u16                   spp_pathmaxrxt;
 811         __u32                   spp_pathmtu;
 812         __u32                   spp_sackdelay;
 813         __u32                   spp_flags;
 814         __u32                   spp_ipv6_flowlabel;
 815         __u8                    spp_dscp;
 816 } __attribute__((packed, aligned(4)));
 817
 818 /*
 819  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 820  *
 821  * This set option adds a chunk type that the user is requesting to be
 822  * received only in an authenticated way.  Changes to the list of chunks
 823  * will only effect future associations on the socket.
 824  */
 825 struct sctp_authchunk {
 826         __u8            sauth_chunk;
 827 };
 828
 829 /*
 830  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 831  *
 832  * This option gets or sets the list of HMAC algorithms that the local
 833  * endpoint requires the peer to use.
 834  */
 835 #ifndef __KERNEL__
 836 /* This here is only used by user space as is. It might not be a good idea
 837  * to export/reveal the whole structure with reserved fields etc.
 838  */
 839 enum {
 840         SCTP_AUTH_HMAC_ID_SHA1 = 1,
 841         SCTP_AUTH_HMAC_ID_SHA256 = 3,
 842 };
 843 #endif
 844
 845 struct sctp_hmacalgo {
 846         __u32           shmac_num_idents;
 847         __u16           shmac_idents[];
 848 };
 849
 850 /* Sadly, user and kernel space have different names for
 851  * this structure member, so this is to not break anything.
 852  */
 853 #define shmac_number_of_idents  shmac_num_idents
 854
 855 /*
 856  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 857  *
 858  * This option will set a shared secret key which is used to build an
 859  * association shared key.
 860  */
 861 struct sctp_authkey {
 862         sctp_assoc_t    sca_assoc_id;
 863         __u16           sca_keynumber;
 864         __u16           sca_keylength;
 865         __u8            sca_key[];
 866 };
 867
 868 /*
 869  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 870  *
 871  * This option will get or set the active shared key to be used to build
 872  * the association shared key.
 873  */
 874
 875 struct sctp_authkeyid {
 876         sctp_assoc_t    scact_assoc_id;
 877         __u16           scact_keynumber;
 878 };
 879
 880
 881 /*
 882  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 883  *
 884  * This option will effect the way delayed acks are performed.  This
 885  * option allows you to get or set the delayed ack time, in
 886  * milliseconds.  It also allows changing the delayed ack frequency.
 887  * Changing the frequency to 1 disables the delayed sack algorithm.  If
 888  * the assoc_id is 0, then this sets or gets the endpoints default
 889  * values.  If the assoc_id field is non-zero, then the set or get
 890  * effects the specified association for the one to many model (the
 891  * assoc_id field is ignored by the one to one model).  Note that if
 892  * sack_delay or sack_freq are 0 when setting this option, then the
 893  * current values will remain unchanged.
 894  */
 895 struct sctp_sack_info {
 896         sctp_assoc_t    sack_assoc_id;
 897         uint32_t        sack_delay;
 898         uint32_t        sack_freq;
 899 };
 900
 901 struct sctp_assoc_value {
 902     sctp_assoc_t            assoc_id;
 903     uint32_t                assoc_value;
 904 };
 905
 906 struct sctp_stream_value {
 907         sctp_assoc_t assoc_id;
 908         uint16_t stream_id;
 909         uint16_t stream_value;
 910 };
 911
 912 /*
 913  * 7.2.2 Peer Address Information
 914  *
 915  *   Applications can retrieve information about a specific peer address
 916  *   of an association, including its reachability state, congestion
 917  *   window, and retransmission timer values.  This information is
 918  *   read-only. The following structure is used to access this
 919  *   information:
 920  */
 921 struct sctp_paddrinfo {
 922         sctp_assoc_t            spinfo_assoc_id;
 923         struct sockaddr_storage spinfo_address;
 924         __s32                   spinfo_state;
 925         __u32                   spinfo_cwnd;
 926         __u32                   spinfo_srtt;
 927         __u32                   spinfo_rto;
 928         __u32                   spinfo_mtu;
 929 } __attribute__((packed, aligned(4)));
 930
 931 /* Peer addresses's state. */
 932 /* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
 933  * calls.
 934  * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
 935  *              Not yet confirmed by a heartbeat and not available for data
 936  *              transfers.
 937  * ACTIVE : Peer address confirmed, active and available for data transfers.
 938  * INACTIVE: Peer address inactive and not available for data transfers.
 939  */
 940 enum sctp_spinfo_state {
 941         SCTP_INACTIVE,
 942         SCTP_PF,
 943 #define SCTP_POTENTIALLY_FAILED         SCTP_PF
 944         SCTP_ACTIVE,
 945         SCTP_UNCONFIRMED,
 946         SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 947 };
 948
 949 /*
 950  * 7.2.1 Association Status (SCTP_STATUS)
 951  *
 952  *   Applications can retrieve current status information about an
 953  *   association, including association state, peer receiver window size,
 954  *   number of unacked data chunks, and number of data chunks pending
 955  *   receipt.  This information is read-only.  The following structure is
 956  *   used to access this information:
 957  */
 958 struct sctp_status {
 959         sctp_assoc_t            sstat_assoc_id;
 960         __s32                   sstat_state;
 961         __u32                   sstat_rwnd;
 962         __u16                   sstat_unackdata;
 963         __u16                   sstat_penddata;
 964         __u16                   sstat_instrms;
 965         __u16                   sstat_outstrms;
 966         __u32                   sstat_fragmentation_point;
 967         struct sctp_paddrinfo   sstat_primary;
 968 };
 969
 970 /*
 971  * 7.2.3.  Get the list of chunks the peer requires to be authenticated
 972  *         (SCTP_PEER_AUTH_CHUNKS)
 973  *
 974  * This option gets a list of chunks for a specified association that
 975  * the peer requires to be received authenticated only.
 976  */
 977 struct sctp_authchunks {
 978         sctp_assoc_t    gauth_assoc_id;
 979         __u32           gauth_number_of_chunks;
 980         uint8_t         gauth_chunks[];
 981 };
 982
 983 /* The broken spelling has been released already in lksctp-tools header,
 984  * so don't break anyone, now that it's fixed.
 985  */
 986 #define guth_number_of_chunks   gauth_number_of_chunks
 987
 988 /* Association states.  */
 989 enum sctp_sstat_state {
 990         SCTP_EMPTY                = 0,
 991         SCTP_CLOSED               = 1,
 992         SCTP_COOKIE_WAIT          = 2,
 993         SCTP_COOKIE_ECHOED        = 3,
 994         SCTP_ESTABLISHED          = 4,
 995         SCTP_SHUTDOWN_PENDING     = 5,
 996         SCTP_SHUTDOWN_SENT        = 6,
 997         SCTP_SHUTDOWN_RECEIVED    = 7,
 998         SCTP_SHUTDOWN_ACK_SENT    = 8,
 999 };
1000
1001 /*
1002  * 8.2.6. Get the Current Identifiers of Associations
1003  *        (SCTP_GET_ASSOC_ID_LIST)
1004  *
1005  * This option gets the current list of SCTP association identifiers of
1006  * the SCTP associations handled by a one-to-many style socket.
1007  */
1008 struct sctp_assoc_ids {
1009         __u32           gaids_number_of_ids;
1010         sctp_assoc_t    gaids_assoc_id[];
1011 };
1012
1013 /*
1014  * 8.3, 8.5 get all peer/local addresses in an association.
1015  * This parameter struct is used by SCTP_GET_PEER_ADDRS and
1016  * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
1017  * sctp_getpaddrs() and sctp_getladdrs() API.
1018  */
1019 struct sctp_getaddrs_old {
1020         sctp_assoc_t            assoc_id;
1021         int                     addr_num;
1022 #ifdef __KERNEL__
1023         struct sockaddr         __user *addrs;
1024 #else
1025         struct sockaddr         *addrs;
1026 #endif
1027 };
1028
1029 struct sctp_getaddrs {
1030         sctp_assoc_t            assoc_id; /*input*/
1031         __u32                   addr_num; /*output*/
1032         __u8                    addrs[]; /*output, variable size*/
1033 };
1034
1035 /* A socket user request obtained via SCTP_GET_ASSOC_STATS that retrieves
1036  * association stats. All stats are counts except sas_maxrto and
1037  * sas_obs_rto_ipaddr. maxrto is the max observed rto + transport since
1038  * the last call. Will return 0 when RTO was not update since last call
1039  */
1040 struct sctp_assoc_stats {
1041         sctp_assoc_t    sas_assoc_id;    /* Input */
1042                                          /* Transport of observed max RTO */
1043         struct sockaddr_storage sas_obs_rto_ipaddr;
1044         __u64           sas_maxrto;      /* Maximum Observed RTO for period */
1045         __u64           sas_isacks;      /* SACKs received */
1046         __u64           sas_osacks;      /* SACKs sent */
1047         __u64           sas_opackets;    /* Packets sent */
1048         __u64           sas_ipackets;    /* Packets received */
1049         __u64           sas_rtxchunks;   /* Retransmitted Chunks */
1050         __u64           sas_outofseqtsns;/* TSN received > next expected */
1051         __u64           sas_idupchunks;  /* Dups received (ordered+unordered) */
1052         __u64           sas_gapcnt;      /* Gap Acknowledgements Received */
1053         __u64           sas_ouodchunks;  /* Unordered data chunks sent */
1054         __u64           sas_iuodchunks;  /* Unordered data chunks received */
1055         __u64           sas_oodchunks;   /* Ordered data chunks sent */
1056         __u64           sas_iodchunks;   /* Ordered data chunks received */
1057         __u64           sas_octrlchunks; /* Control chunks sent */
1058         __u64           sas_ictrlchunks; /* Control chunks received */
1059 };
1060
1061 /*
1062  * 8.1 sctp_bindx()
1063  *
1064  * The flags parameter is formed from the bitwise OR of zero or more of the
1065  * following currently defined flags:
1066  */
1067 #define SCTP_BINDX_ADD_ADDR 0x01
1068 #define SCTP_BINDX_REM_ADDR 0x02
1069
1070 /* This is the structure that is passed as an argument(optval) to
1071  * getsockopt(SCTP_SOCKOPT_PEELOFF).
1072  */
1073 typedef struct {
1074         sctp_assoc_t associd;
1075         int sd;
1076 } sctp_peeloff_arg_t;
1077
1078 typedef struct {
1079         sctp_peeloff_arg_t p_arg;
1080         unsigned flags;
1081 } sctp_peeloff_flags_arg_t;
1082
1083 /*
1084  *  Peer Address Thresholds socket option
1085  */
1086 struct sctp_paddrthlds {
1087         sctp_assoc_t spt_assoc_id;
1088         struct sockaddr_storage spt_address;
1089         __u16 spt_pathmaxrxt;
1090         __u16 spt_pathpfthld;
1091 };
1092
1093 /* Use a new structure with spt_pathcpthld for back compatibility */
1094 struct sctp_paddrthlds_v2 {
1095         sctp_assoc_t spt_assoc_id;
1096         struct sockaddr_storage spt_address;
1097         __u16 spt_pathmaxrxt;
1098         __u16 spt_pathpfthld;
1099         __u16 spt_pathcpthld;
1100 };
1101
1102 /*
1103  * Socket Option for Getting the Association/Stream-Specific PR-SCTP Status
1104  */
1105 struct sctp_prstatus {
1106         sctp_assoc_t sprstat_assoc_id;
1107         __u16 sprstat_sid;
1108         __u16 sprstat_policy;
1109         __u64 sprstat_abandoned_unsent;
1110         __u64 sprstat_abandoned_sent;
1111 };
1112
1113 struct sctp_default_prinfo {
1114         sctp_assoc_t pr_assoc_id;
1115         __u32 pr_value;
1116         __u16 pr_policy;
1117 };
1118
1119 struct sctp_info {
1120         __u32   sctpi_tag;
1121         __u32   sctpi_state;
1122         __u32   sctpi_rwnd;
1123         __u16   sctpi_unackdata;
1124         __u16   sctpi_penddata;
1125         __u16   sctpi_instrms;
1126         __u16   sctpi_outstrms;
1127         __u32   sctpi_fragmentation_point;
1128         __u32   sctpi_inqueue;
1129         __u32   sctpi_outqueue;
1130         __u32   sctpi_overall_error;
1131         __u32   sctpi_max_burst;
1132         __u32   sctpi_maxseg;
1133         __u32   sctpi_peer_rwnd;
1134         __u32   sctpi_peer_tag;
1135         __u8    sctpi_peer_capable;
1136         __u8    sctpi_peer_sack;
1137         __u16   __reserved1;
1138
1139         /* assoc status info */
1140         __u64   sctpi_isacks;
1141         __u64   sctpi_osacks;
1142         __u64   sctpi_opackets;
1143         __u64   sctpi_ipackets;
1144         __u64   sctpi_rtxchunks;
1145         __u64   sctpi_outofseqtsns;
1146         __u64   sctpi_idupchunks;
1147         __u64   sctpi_gapcnt;
1148         __u64   sctpi_ouodchunks;
1149         __u64   sctpi_iuodchunks;
1150         __u64   sctpi_oodchunks;
1151         __u64   sctpi_iodchunks;
1152         __u64   sctpi_octrlchunks;
1153         __u64   sctpi_ictrlchunks;
1154
1155         /* primary transport info */
1156         struct sockaddr_storage sctpi_p_address;
1157         __s32   sctpi_p_state;
1158         __u32   sctpi_p_cwnd;
1159         __u32   sctpi_p_srtt;
1160         __u32   sctpi_p_rto;
1161         __u32   sctpi_p_hbinterval;
1162         __u32   sctpi_p_pathmaxrxt;
1163         __u32   sctpi_p_sackdelay;
1164         __u32   sctpi_p_sackfreq;
1165         __u32   sctpi_p_ssthresh;
1166         __u32   sctpi_p_partial_bytes_acked;
1167         __u32   sctpi_p_flight_size;
1168         __u16   sctpi_p_error;
1169         __u16   __reserved2;
1170
1171         /* sctp sock info */
1172         __u32   sctpi_s_autoclose;
1173         __u32   sctpi_s_adaptation_ind;
1174         __u32   sctpi_s_pd_point;
1175         __u8    sctpi_s_nodelay;
1176         __u8    sctpi_s_disable_fragments;
1177         __u8    sctpi_s_v4mapped;
1178         __u8    sctpi_s_frag_interleave;
1179         __u32   sctpi_s_type;
1180         __u32   __reserved3;
1181 };
1182
1183 struct sctp_reset_streams {
1184         sctp_assoc_t srs_assoc_id;
1185         uint16_t srs_flags;
1186         uint16_t srs_number_streams;    /* 0 == ALL */
1187         uint16_t srs_stream_list[];     /* list if srs_num_streams is not 0 */
1188 };
1189
1190 struct sctp_add_streams {
1191         sctp_assoc_t sas_assoc_id;
1192         uint16_t sas_instrms;
1193         uint16_t sas_outstrms;
1194 };
1195
1196 struct sctp_event {
1197         sctp_assoc_t se_assoc_id;
1198         uint16_t se_type;
1199         uint8_t se_on;
1200 };
1201
1202 struct sctp_udpencaps {
1203         sctp_assoc_t sue_assoc_id;
1204         struct sockaddr_storage sue_address;
1205         uint16_t sue_port;
1206 };
1207
1208 /* SCTP Stream schedulers */
1209 enum sctp_sched_type {
1210         SCTP_SS_FCFS,
1211         SCTP_SS_DEFAULT = SCTP_SS_FCFS,
1212         SCTP_SS_PRIO,
1213         SCTP_SS_RR,
1214         SCTP_SS_FC,
1215         SCTP_SS_WFQ,
1216         SCTP_SS_MAX = SCTP_SS_WFQ
1217 };
1218
1219 /* Probe Interval socket option */
1220 struct sctp_probeinterval {
1221         sctp_assoc_t spi_assoc_id;
1222         struct sockaddr_storage spi_address;
1223         __u32 spi_interval;
1224 };
1225
1226 #endif /* _UAPI_SCTP_H */