user.h

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/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2002 Intel Corp.
 *
 * This file is part of the SCTP kernel implementation
 *
 * This header represents the structures and constants needed to support
 * the SCTP Extension to the Sockets API.
 *
 * This SCTP implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This SCTP implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <[email protected]>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    La Monte H.P. Yarroll    <[email protected]>
 *    R. Stewart               <[email protected]>
 *    K. Morneau               <[email protected]>
 *    Q. Xie                   <[email protected]>
 *    Karl Knutson             <[email protected]>
 *    Jon Grimm                <[email protected]>
 *    Daisy Chang              <[email protected]>
 *    Ryan Layer               <[email protected]>
 *    Ardelle Fan          <[email protected]>
 *    Sridhar Samudrala        <[email protected]>
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#ifndef __net_sctp_user_h__
#define __net_sctp_user_h__

#include <linux/types.h>
#include <linux/socket.h>

typedef __s32 sctp_assoc_t;

/* The following symbols come from the Sockets API Extensions for
 * SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
 */
#define SCTP_RTOINFO    0
#define SCTP_ASSOCINFO  1
#define SCTP_INITMSG    2
#define SCTP_NODELAY    3       /* Get/set nodelay option. */
#define SCTP_AUTOCLOSE  4
#define SCTP_SET_PEER_PRIMARY_ADDR 5
#define SCTP_PRIMARY_ADDR   6
#define SCTP_ADAPTATION_LAYER   7
#define SCTP_DISABLE_FRAGMENTS  8
#define SCTP_PEER_ADDR_PARAMS   9
#define SCTP_DEFAULT_SEND_PARAM 10
#define SCTP_EVENTS 11
#define SCTP_I_WANT_MAPPED_V4_ADDR 12   /* Turn on/off mapped v4 addresses  */
#define SCTP_MAXSEG 13      /* Get/set maximum fragment. */
#define SCTP_STATUS 14
#define SCTP_GET_PEER_ADDR_INFO 15
#define SCTP_DELAYED_ACK_TIME   16
#define SCTP_DELAYED_ACK SCTP_DELAYED_ACK_TIME
#define SCTP_DELAYED_SACK SCTP_DELAYED_ACK_TIME
#define SCTP_CONTEXT    17
#define SCTP_FRAGMENT_INTERLEAVE    18
#define SCTP_PARTIAL_DELIVERY_POINT 19 /* Set/Get partial delivery point */
#define SCTP_MAX_BURST  20      /* Set/Get max burst */
#define SCTP_AUTH_CHUNK 21  /* Set only: add a chunk type to authenticate */
#define SCTP_HMAC_IDENT 22
#define SCTP_AUTH_KEY   23
#define SCTP_AUTH_ACTIVE_KEY    24
#define SCTP_AUTH_DELETE_KEY    25
#define SCTP_PEER_AUTH_CHUNKS   26  /* Read only */
#define SCTP_LOCAL_AUTH_CHUNKS  27  /* Read only */
#define SCTP_GET_ASSOC_NUMBER   28  /* Read only */
#define SCTP_GET_ASSOC_ID_LIST  29  /* Read only */
#define SCTP_AUTO_ASCONF       30
#define SCTP_PEER_ADDR_THLDS    31

/* Internal Socket Options. Some of the sctp library functions are
 * implemented using these socket options.
 */
#define SCTP_SOCKOPT_BINDX_ADD  100 /* BINDX requests for adding addrs */
#define SCTP_SOCKOPT_BINDX_REM  101 /* BINDX requests for removing addrs. */
#define SCTP_SOCKOPT_PEELOFF    102 /* peel off association. */
/* Options 104-106 are deprecated and removed. Do not use this space */
#define SCTP_SOCKOPT_CONNECTX_OLD   107 /* CONNECTX old requests. */
#define SCTP_GET_PEER_ADDRS 108     /* Get all peer address. */
#define SCTP_GET_LOCAL_ADDRS    109     /* Get all local address. */
#define SCTP_SOCKOPT_CONNECTX   110     /* CONNECTX requests. */
#define SCTP_SOCKOPT_CONNECTX3  111 /* CONNECTX requests (updated) */

/*
 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
 *
 *   This cmsghdr structure provides information for initializing new
 *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
 *   uses this same data structure.  This structure is not used for
 *   recvmsg().
 *
 *   cmsg_level    cmsg_type      cmsg_data[]
 *   ------------  ------------   ----------------------
 *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
 *
 */
struct sctp_initmsg {
    __u16 sinit_num_ostreams;
    __u16 sinit_max_instreams;
    __u16 sinit_max_attempts;
    __u16 sinit_max_init_timeo;
};

/*
 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 *
 *   This cmsghdr structure specifies SCTP options for sendmsg() and
 *   describes SCTP header information about a received message through
 *   recvmsg().
 *
 *   cmsg_level    cmsg_type      cmsg_data[]
 *   ------------  ------------   ----------------------
 *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
 *
 */
struct sctp_sndrcvinfo {
    __u16 sinfo_stream;
    __u16 sinfo_ssn;
    __u16 sinfo_flags;
    __u32 sinfo_ppid;
    __u32 sinfo_context;
    __u32 sinfo_timetolive;
    __u32 sinfo_tsn;
    __u32 sinfo_cumtsn;
    sctp_assoc_t sinfo_assoc_id;
};

/*
 *  sinfo_flags: 16 bits (unsigned integer)
 *
 *   This field may contain any of the following flags and is composed of
 *   a bitwise OR of these values.
 */

enum sctp_sinfo_flags {
    SCTP_UNORDERED = 1,  /* Send/receive message unordered. */
    SCTP_ADDR_OVER = 2,  /* Override the primary destination. */
    SCTP_ABORT=4,        /* Send an ABORT message to the peer. */
    SCTP_SACK_IMMEDIATELY = 8,  /* SACK should be sent without delay */
    SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */  
};


/* These are cmsg_types.  */
typedef enum sctp_cmsg_type {
    SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
    SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
} sctp_cmsg_t;


/*
 * 5.3.1.1 SCTP_ASSOC_CHANGE
 *
 *   Communication notifications inform the ULP that an SCTP association
 *   has either begun or ended. The identifier for a new association is
 *   provided by this notificaion. The notification information has the
 *   following format:
 *
 */
struct sctp_assoc_change {
    __u16 sac_type;
    __u16 sac_flags;
    __u32 sac_length;
    __u16 sac_state;
    __u16 sac_error;
    __u16 sac_outbound_streams;
    __u16 sac_inbound_streams;
    sctp_assoc_t sac_assoc_id;
    __u8 sac_info[0];
};

/*
 *   sac_state: 32 bits (signed integer)
 *
 *   This field holds one of a number of values that communicate the
 *   event that happened to the association.  They include:
 *
 *   Note:  The following state names deviate from the API draft as
 *   the names clash too easily with other kernel symbols.
 */
enum sctp_sac_state {
    SCTP_COMM_UP,
    SCTP_COMM_LOST,
    SCTP_RESTART,
    SCTP_SHUTDOWN_COMP,
    SCTP_CANT_STR_ASSOC,
};

/*
 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 *
 *   When a destination address on a multi-homed peer encounters a change
 *   an interface details event is sent.  The information has the
 *   following structure:
 */
struct sctp_paddr_change {
    __u16 spc_type;
    __u16 spc_flags;
    __u32 spc_length;
    struct sockaddr_storage spc_aaddr;
    int spc_state;
    int spc_error;
    sctp_assoc_t spc_assoc_id;
} __attribute__((packed, aligned(4)));

/*
 *    spc_state:  32 bits (signed integer)
 *
 *   This field holds one of a number of values that communicate the
 *   event that happened to the address.  They include:
 */
enum sctp_spc_state {
    SCTP_ADDR_AVAILABLE,
    SCTP_ADDR_UNREACHABLE,
    SCTP_ADDR_REMOVED,
    SCTP_ADDR_ADDED,
    SCTP_ADDR_MADE_PRIM,
    SCTP_ADDR_CONFIRMED,
};


/*
 * 5.3.1.3 SCTP_REMOTE_ERROR
 *
 *   A remote peer may send an Operational Error message to its peer.
 *   This message indicates a variety of error conditions on an
 *   association. The entire error TLV as it appears on the wire is
 *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 *   specification [SCTP] and any extensions for a list of possible
 *   error formats. SCTP error TLVs have the format:
 */
struct sctp_remote_error {
    __u16 sre_type;
    __u16 sre_flags;
    __u32 sre_length;
    __u16 sre_error;
    sctp_assoc_t sre_assoc_id;
    __u8 sre_data[0];
};


/*
 * 5.3.1.4 SCTP_SEND_FAILED
 *
 *   If SCTP cannot deliver a message it may return the message as a
 *   notification.
 */
struct sctp_send_failed {
    __u16 ssf_type;
    __u16 ssf_flags;
    __u32 ssf_length;
    __u32 ssf_error;
    struct sctp_sndrcvinfo ssf_info;
    sctp_assoc_t ssf_assoc_id;
    __u8 ssf_data[0];
};

/*
 *   ssf_flags: 16 bits (unsigned integer)
 *
 *   The flag value will take one of the following values
 *
 *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
 *                       the wire.
 *
 *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
 *                       Note that this does not necessarily mean that the
 *                       data was (or was not) successfully delivered.
 */
enum sctp_ssf_flags {
    SCTP_DATA_UNSENT,
    SCTP_DATA_SENT,
};

/*
 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 *
 *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
 *   inform the application that it should cease sending data.
 */
struct sctp_shutdown_event {
    __u16 sse_type;
    __u16 sse_flags;
    __u32 sse_length;
    sctp_assoc_t sse_assoc_id;
};

/*
 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
 *
 *   When a peer sends a Adaptation Layer Indication parameter , SCTP
 *   delivers this notification to inform the application
 *   that of the peers requested adaptation layer.
 */
struct sctp_adaptation_event {
    __u16 sai_type;
    __u16 sai_flags;
    __u32 sai_length;
    __u32 sai_adaptation_ind;
    sctp_assoc_t sai_assoc_id;
};

/*
 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 *
 *   When a receiver is engaged in a partial delivery of a
 *   message this notification will be used to indicate
 *   various events.
 */
struct sctp_pdapi_event {
    __u16 pdapi_type;
    __u16 pdapi_flags;
    __u32 pdapi_length;
    __u32 pdapi_indication;
    sctp_assoc_t pdapi_assoc_id;
};

enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };

struct sctp_authkey_event {
    __u16 auth_type;
    __u16 auth_flags;
    __u32 auth_length;
    __u16 auth_keynumber;
    __u16 auth_altkeynumber;
    __u32 auth_indication;
    sctp_assoc_t auth_assoc_id;
};

enum { SCTP_AUTH_NEWKEY = 0, };

/*
 * 6.1.9. SCTP_SENDER_DRY_EVENT
 *
 * When the SCTP stack has no more user data to send or retransmit, this
 * notification is given to the user. Also, at the time when a user app
 * subscribes to this event, if there is no data to be sent or
 * retransmit, the stack will immediately send up this notification.
 */
struct sctp_sender_dry_event {
    __u16 sender_dry_type;
    __u16 sender_dry_flags;
    __u32 sender_dry_length;
    sctp_assoc_t sender_dry_assoc_id;
};

/*
 * Described in Section 7.3
 *   Ancillary Data and Notification Interest Options
 */
struct sctp_event_subscribe {
    __u8 sctp_data_io_event;
    __u8 sctp_association_event;
    __u8 sctp_address_event;
    __u8 sctp_send_failure_event;
    __u8 sctp_peer_error_event;
    __u8 sctp_shutdown_event;
    __u8 sctp_partial_delivery_event;
    __u8 sctp_adaptation_layer_event;
    __u8 sctp_authentication_event;
    __u8 sctp_sender_dry_event;
};

/*
 * 5.3.1 SCTP Notification Structure
 *
 *   The notification structure is defined as the union of all
 *   notification types.
 *
 */
union sctp_notification {
    struct {
        __u16 sn_type;             /* Notification type. */
        __u16 sn_flags;
        __u32 sn_length;
    } sn_header;
    struct sctp_assoc_change sn_assoc_change;
    struct sctp_paddr_change sn_paddr_change;
    struct sctp_remote_error sn_remote_error;
    struct sctp_send_failed sn_send_failed;
    struct sctp_shutdown_event sn_shutdown_event;
    struct sctp_adaptation_event sn_adaptation_event;
    struct sctp_pdapi_event sn_pdapi_event;
    struct sctp_authkey_event sn_authkey_event;
    struct sctp_sender_dry_event sn_sender_dry_event;
};

/* Section 5.3.1
 * All standard values for sn_type flags are greater than 2^15.
 * Values from 2^15 and down are reserved.
 */

enum sctp_sn_type {
    SCTP_SN_TYPE_BASE     = (1<<15),
    SCTP_ASSOC_CHANGE,
    SCTP_PEER_ADDR_CHANGE,
    SCTP_SEND_FAILED,
    SCTP_REMOTE_ERROR,
    SCTP_SHUTDOWN_EVENT,
    SCTP_PARTIAL_DELIVERY_EVENT,
    SCTP_ADAPTATION_INDICATION,
    SCTP_AUTHENTICATION_EVENT,
#define SCTP_AUTHENTICATION_INDICATION  SCTP_AUTHENTICATION_EVENT
    SCTP_SENDER_DRY_EVENT,
};

/* Notification error codes used to fill up the error fields in some
 * notifications.
 * SCTP_PEER_ADDRESS_CHAGE  : spc_error
 * SCTP_ASSOC_CHANGE        : sac_error
 * These names should be potentially included in the draft 04 of the SCTP
 * sockets API specification.
 */
typedef enum sctp_sn_error {
    SCTP_FAILED_THRESHOLD,
    SCTP_RECEIVED_SACK,
    SCTP_HEARTBEAT_SUCCESS,
    SCTP_RESPONSE_TO_USER_REQ,
    SCTP_INTERNAL_ERROR,
    SCTP_SHUTDOWN_GUARD_EXPIRES,
    SCTP_PEER_FAULTY,
} sctp_sn_error_t;

/*
 * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
 *
 *   The protocol parameters used to initialize and bound retransmission
 *   timeout (RTO) are tunable.  See [SCTP] for more information on how
 *   these parameters are used in RTO calculation. 
 */
struct sctp_rtoinfo {
    sctp_assoc_t    srto_assoc_id;
    __u32       srto_initial;
    __u32       srto_max;
    __u32       srto_min;
};

/*
 * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
 *
 *   This option is used to both examine and set various association and
 *   endpoint parameters.
 */
struct sctp_assocparams {
    sctp_assoc_t    sasoc_assoc_id;
    __u16       sasoc_asocmaxrxt;
    __u16       sasoc_number_peer_destinations;
    __u32       sasoc_peer_rwnd;
    __u32       sasoc_local_rwnd;
    __u32       sasoc_cookie_life;
};

/*
 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 *
 *  Requests that the peer mark the enclosed address as the association
 *  primary. The enclosed address must be one of the association's
 *  locally bound addresses. The following structure is used to make a
 *   set primary request:
 */
struct sctp_setpeerprim {
    sctp_assoc_t            sspp_assoc_id;
    struct sockaddr_storage sspp_addr;
} __attribute__((packed, aligned(4)));

/*
 * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 *
 *  Requests that the local SCTP stack use the enclosed peer address as
 *  the association primary. The enclosed address must be one of the
 *  association peer's addresses. The following structure is used to
 *  make a set peer primary request:
 */
struct sctp_prim {
    sctp_assoc_t            ssp_assoc_id;
    struct sockaddr_storage ssp_addr;
} __attribute__((packed, aligned(4)));

/*
 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
 *
 * Requests that the local endpoint set the specified Adaptation Layer
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
struct sctp_setadaptation {
    __u32   ssb_adaptation_ind;
};

/*
 * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
 *
 *   Applications can enable or disable heartbeats for any peer address
 *   of an association, modify an address's heartbeat interval, force a
 *   heartbeat to be sent immediately, and adjust the address's maximum
 *   number of retransmissions sent before an address is considered
 *   unreachable. The following structure is used to access and modify an
 *   address's parameters:
 */
enum  sctp_spp_flags {
    SPP_HB_ENABLE = 1<<0,       /*Enable heartbeats*/
    SPP_HB_DISABLE = 1<<1,      /*Disable heartbeats*/
    SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
    SPP_HB_DEMAND = 1<<2,       /*Send heartbeat immediately*/
    SPP_PMTUD_ENABLE = 1<<3,    /*Enable PMTU discovery*/
    SPP_PMTUD_DISABLE = 1<<4,   /*Disable PMTU discovery*/
    SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
    SPP_SACKDELAY_ENABLE = 1<<5,    /*Enable SACK*/
    SPP_SACKDELAY_DISABLE = 1<<6,   /*Disable SACK*/
    SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
    SPP_HB_TIME_IS_ZERO = 1<<7, /* Set HB delay to 0 */
};

struct sctp_paddrparams {
    sctp_assoc_t        spp_assoc_id;
    struct sockaddr_storage spp_address;
    __u32           spp_hbinterval;
    __u16           spp_pathmaxrxt;
    __u32           spp_pathmtu;
    __u32           spp_sackdelay;
    __u32           spp_flags;
} __attribute__((packed, aligned(4)));

/*
 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 *
 * This set option adds a chunk type that the user is requesting to be
 * received only in an authenticated way.  Changes to the list of chunks
 * will only effect future associations on the socket.
 */
struct sctp_authchunk {
    __u8        sauth_chunk;
};

/*
 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 *
 * This option gets or sets the list of HMAC algorithms that the local
 * endpoint requires the peer to use.
*/
struct sctp_hmacalgo {
    __u32       shmac_num_idents;
    __u16       shmac_idents[];
};

/*
 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 *
 * This option will set a shared secret key which is used to build an
 * association shared key.
 */
struct sctp_authkey {
    sctp_assoc_t    sca_assoc_id;
    __u16       sca_keynumber;
    __u16       sca_keylength;
    __u8        sca_key[];
};

/*
 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 *
 * This option will get or set the active shared key to be used to build
 * the association shared key.
 */

struct sctp_authkeyid {
    sctp_assoc_t    scact_assoc_id;
    __u16       scact_keynumber;
};


/*
 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 *
 * This option will effect the way delayed acks are performed.  This
 * option allows you to get or set the delayed ack time, in
 * milliseconds.  It also allows changing the delayed ack frequency.
 * Changing the frequency to 1 disables the delayed sack algorithm.  If
 * the assoc_id is 0, then this sets or gets the endpoints default
 * values.  If the assoc_id field is non-zero, then the set or get
 * effects the specified association for the one to many model (the
 * assoc_id field is ignored by the one to one model).  Note that if
 * sack_delay or sack_freq are 0 when setting this option, then the
 * current values will remain unchanged.
 */
struct sctp_sack_info {
    sctp_assoc_t    sack_assoc_id;
    uint32_t    sack_delay;
    uint32_t    sack_freq;
};

struct sctp_assoc_value {
    sctp_assoc_t            assoc_id;
    uint32_t                assoc_value;
};

/*
 * 7.2.2 Peer Address Information
 *
 *   Applications can retrieve information about a specific peer address
 *   of an association, including its reachability state, congestion
 *   window, and retransmission timer values.  This information is
 *   read-only. The following structure is used to access this
 *   information:
 */
struct sctp_paddrinfo {
    sctp_assoc_t        spinfo_assoc_id;
    struct sockaddr_storage spinfo_address;
    __s32           spinfo_state;
    __u32           spinfo_cwnd;
    __u32           spinfo_srtt;
    __u32           spinfo_rto;
    __u32           spinfo_mtu;
} __attribute__((packed, aligned(4)));

/* Peer addresses's state. */
/* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
 * calls.
 * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
 *              Not yet confirmed by a heartbeat and not available for data
 *      transfers.
 * ACTIVE : Peer address confirmed, active and available for data transfers.
 * INACTIVE: Peer address inactive and not available for data transfers.
 */
enum sctp_spinfo_state {
    SCTP_INACTIVE,
    SCTP_PF,
    SCTP_ACTIVE,
    SCTP_UNCONFIRMED,
    SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
};

/*
 * 7.2.1 Association Status (SCTP_STATUS)
 *
 *   Applications can retrieve current status information about an
 *   association, including association state, peer receiver window size,
 *   number of unacked data chunks, and number of data chunks pending
 *   receipt.  This information is read-only.  The following structure is
 *   used to access this information:
 */
struct sctp_status {
    sctp_assoc_t        sstat_assoc_id;
    __s32           sstat_state;
    __u32           sstat_rwnd;
    __u16           sstat_unackdata;
    __u16           sstat_penddata;
    __u16           sstat_instrms;
    __u16           sstat_outstrms;
    __u32           sstat_fragmentation_point;
    struct sctp_paddrinfo   sstat_primary;
};

/*
 * 7.2.3.  Get the list of chunks the peer requires to be authenticated
 *         (SCTP_PEER_AUTH_CHUNKS)
 *
 * This option gets a list of chunks for a specified association that
 * the peer requires to be received authenticated only.
 */
struct sctp_authchunks {
    sctp_assoc_t    gauth_assoc_id;
    __u32       gauth_number_of_chunks;
    uint8_t     gauth_chunks[];
};

/*
 * 8.2.6. Get the Current Identifiers of Associations
 *        (SCTP_GET_ASSOC_ID_LIST)
 *
 * This option gets the current list of SCTP association identifiers of
 * the SCTP associations handled by a one-to-many style socket.
 */
struct sctp_assoc_ids {
    __u32       gaids_number_of_ids;
    sctp_assoc_t    gaids_assoc_id[];
};

/*
 * 8.3, 8.5 get all peer/local addresses in an association.
 * This parameter struct is used by SCTP_GET_PEER_ADDRS and 
 * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
 * sctp_getpaddrs() and sctp_getladdrs() API. 
 */
struct sctp_getaddrs_old {
    sctp_assoc_t            assoc_id;
    int         addr_num;
    struct sockaddr     __user *addrs;
};
struct sctp_getaddrs {
    sctp_assoc_t        assoc_id; /*input*/
    __u32           addr_num; /*output*/
    __u8            addrs[0]; /*output, variable size*/
};

/* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
/* On user space Linux, these live in <bits/socket.h> as an enum.  */
enum sctp_msg_flags {
    MSG_NOTIFICATION = 0x8000,
#define MSG_NOTIFICATION MSG_NOTIFICATION
};

/*
 * 8.1 sctp_bindx()
 *
 * The flags parameter is formed from the bitwise OR of zero or more of the
 * following currently defined flags:
 */
#define SCTP_BINDX_ADD_ADDR 0x01
#define SCTP_BINDX_REM_ADDR 0x02

/* This is the structure that is passed as an argument(optval) to
 * getsockopt(SCTP_SOCKOPT_PEELOFF).
 */
typedef struct {
    sctp_assoc_t associd;
    int sd;
} sctp_peeloff_arg_t;

/*
 *  Peer Address Thresholds socket option
 */
struct sctp_paddrthlds {
    sctp_assoc_t spt_assoc_id;
    struct sockaddr_storage spt_address;
    __u16 spt_pathmaxrxt;
    __u16 spt_pathpfthld;
};
#endif /* __net_sctp_user_h__ */