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 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
 /* 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, see
  * <http://www.gnu.org/licenses/>.
  *
  * Please send any bug reports or fixes you make to the
  * email address(es):
  *    lksctp developers <linux-sctp@vger.kernel.org>
  *
  * Or submit a bug report through the following website:
  *    http://www.sf.net/projects/lksctp
  *
  * Written or modified by:
  *    La Monte H.P. Yarroll    <piggy@acm.org>
  *    R. Stewart               <randall@sctp.chicago.il.us>
  *    K. Morneau               <kmorneau@cisco.com>
  *    Q. Xie                   <qxie1@email.mot.com>
  *    Karl Knutson             <karl@athena.chicago.il.us>
  *    Jon Grimm                <jgrimm@us.ibm.com>
  *    Daisy Chang              <daisyc@us.ibm.com>
  *    Ryan Layer               <rmlayer@us.ibm.com>
  *    Ardelle Fan              <ardelle.fan@intel.com>
  *    Sridhar Samudrala        <sri@us.ibm.com>
  *    Inaky Perez-Gonzalez     <inaky.gonzalez@intel.com>
  *    Vlad Yasevich            <vladislav.yasevich@hp.com>
  *
  * Any bugs reported given to us we will try to fix... any fixes shared will
  * be incorporated into the next SCTP release.
  */
 
 #ifndef _UAPI_SCTP_H
 #define _UAPI_SCTP_H
 
 #include <linux/types.h>
 #include <linux/socket.h>
 
 typedef __s32 sctp_assoc_t;
 
 #define SCTP_FUTURE_ASSOC   0
 #define SCTP_CURRENT_ASSOC  1
 #define SCTP_ALL_ASSOC      2
 
 /* 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
 #define SCTP_RECVRCVINFO    32
 #define SCTP_RECVNXTINFO    33
 #define SCTP_DEFAULT_SNDINFO    34
 #define SCTP_AUTH_DEACTIVATE_KEY    35
 #define SCTP_REUSE_PORT     36
 #define SCTP_PEER_ADDR_THLDS_V2 37
 
 /* 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) */
 #define SCTP_GET_ASSOC_STATS    112 /* Read only */
 #define SCTP_PR_SUPPORTED   113
 #define SCTP_DEFAULT_PRINFO 114
 #define SCTP_PR_ASSOC_STATUS    115
 #define SCTP_PR_STREAM_STATUS   116
 #define SCTP_RECONFIG_SUPPORTED 117
 #define SCTP_ENABLE_STREAM_RESET    118
 #define SCTP_RESET_STREAMS  119
 #define SCTP_RESET_ASSOC    120
 #define SCTP_ADD_STREAMS    121
 #define SCTP_SOCKOPT_PEELOFF_FLAGS 122
 #define SCTP_STREAM_SCHEDULER   123
 #define SCTP_STREAM_SCHEDULER_VALUE 124
 #define SCTP_INTERLEAVING_SUPPORTED 125
 #define SCTP_SENDMSG_CONNECT    126
 #define SCTP_EVENT  127
 #define SCTP_ASCONF_SUPPORTED   128
 #define SCTP_AUTH_SUPPORTED 129
 #define SCTP_ECN_SUPPORTED  130
 #define SCTP_EXPOSE_POTENTIALLY_FAILED_STATE    131
 #define SCTP_EXPOSE_PF_STATE    SCTP_EXPOSE_POTENTIALLY_FAILED_STATE
 #define SCTP_REMOTE_UDP_ENCAPS_PORT 132
 #define SCTP_PLPMTUD_PROBE_INTERVAL 133
 
 /* PR-SCTP policies */
 #define SCTP_PR_SCTP_NONE   0x0000
 #define SCTP_PR_SCTP_TTL    0x0010
 #define SCTP_PR_SCTP_RTX    0x0020
 #define SCTP_PR_SCTP_PRIO   0x0030
 #define SCTP_PR_SCTP_MAX    SCTP_PR_SCTP_PRIO
 #define SCTP_PR_SCTP_MASK   0x0030
 
 #define __SCTP_PR_INDEX(x)  ((x >> 4) - 1)
 #define SCTP_PR_INDEX(x)    __SCTP_PR_INDEX(SCTP_PR_SCTP_ ## x)
 
 #define SCTP_PR_POLICY(x)   ((x) & SCTP_PR_SCTP_MASK)
 #define SCTP_PR_SET_POLICY(flags, x)    \
     do {                \
         flags &= ~SCTP_PR_SCTP_MASK;    \
         flags |= x;     \
     } while (0)
 
 #define SCTP_PR_TTL_ENABLED(x)  (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_TTL)
 #define SCTP_PR_RTX_ENABLED(x)  (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_RTX)
 #define SCTP_PR_PRIO_ENABLED(x) (SCTP_PR_POLICY(x) == SCTP_PR_SCTP_PRIO)
 
 /* For enable stream reset */
 #define SCTP_ENABLE_RESET_STREAM_REQ    0x01
 #define SCTP_ENABLE_RESET_ASSOC_REQ 0x02
 #define SCTP_ENABLE_CHANGE_ASSOC_REQ    0x04
 #define SCTP_ENABLE_STRRESET_MASK   0x07
 
 #define SCTP_STREAM_RESET_INCOMING  0x01
 #define SCTP_STREAM_RESET_OUTGOING  0x02
 
 /* 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
 };
 
 /* 5.3.1 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;
 };
 
 /* 5.3.2 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;
 };
 
 /* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
  *
  *   This cmsghdr structure specifies SCTP options for sendmsg().
  *
  *   cmsg_level    cmsg_type      cmsg_data[]
  *   ------------  ------------   -------------------
  *   IPPROTO_SCTP  SCTP_SNDINFO   struct sctp_sndinfo
  */
 struct sctp_sndinfo {
     __u16 snd_sid;
     __u16 snd_flags;
     __u32 snd_ppid;
     __u32 snd_context;
     sctp_assoc_t snd_assoc_id;
 };
 
 /* 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
  *
  *   This cmsghdr structure describes SCTP receive information
  *   about a received message through recvmsg().
  *
  *   cmsg_level    cmsg_type      cmsg_data[]
  *   ------------  ------------   -------------------
  *   IPPROTO_SCTP  SCTP_RCVINFO   struct sctp_rcvinfo
  */
 struct sctp_rcvinfo {
     __u16 rcv_sid;
     __u16 rcv_ssn;
     __u16 rcv_flags;
     __u32 rcv_ppid;
     __u32 rcv_tsn;
     __u32 rcv_cumtsn;
     __u32 rcv_context;
     sctp_assoc_t rcv_assoc_id;
 };
 
 /* 5.3.6 SCTP Next Receive Information Structure (SCTP_NXTINFO)
  *
  *   This cmsghdr structure describes SCTP receive information
  *   of the next message that will be delivered through recvmsg()
  *   if this information is already available when delivering
  *   the current message.
  *
  *   cmsg_level    cmsg_type      cmsg_data[]
  *   ------------  ------------   -------------------
  *   IPPROTO_SCTP  SCTP_NXTINFO   struct sctp_nxtinfo
  */
 struct sctp_nxtinfo {
     __u16 nxt_sid;
     __u16 nxt_flags;
     __u32 nxt_ppid;
     __u32 nxt_length;
     sctp_assoc_t nxt_assoc_id;
 };
 
 /* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
  *
  *   This cmsghdr structure specifies SCTP options for sendmsg().
  *
  *   cmsg_level    cmsg_type      cmsg_data[]
  *   ------------  ------------   -------------------
  *   IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
  */
 struct sctp_prinfo {
     __u16 pr_policy;
     __u32 pr_value;
 };
 
 /* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
  *
  *   This cmsghdr structure specifies SCTP options for sendmsg().
  *
  *   cmsg_level    cmsg_type      cmsg_data[]
  *   ------------  ------------   -------------------
  *   IPPROTO_SCTP  SCTP_AUTHINFO  struct sctp_authinfo
  */
 struct sctp_authinfo {
     __u16 auth_keynumber;
 };
 
 /*
  *  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 << 0), /* Send/receive message unordered. */
     SCTP_ADDR_OVER      = (1 << 1), /* Override the primary destination. */
     SCTP_ABORT      = (1 << 2), /* Send an ABORT message to the peer. */
     SCTP_SACK_IMMEDIATELY   = (1 << 3), /* SACK should be sent without delay. */
     /* 2 bits here have been used by SCTP_PR_SCTP_MASK */
     SCTP_SENDALL        = (1 << 6),
     SCTP_PR_SCTP_ALL    = (1 << 7),
     SCTP_NOTIFICATION   = MSG_NOTIFICATION, /* Next message is not user msg but notification. */
     SCTP_EOF        = MSG_FIN,  /* Initiate graceful shutdown process. */
 };
 
 typedef union {
     __u8            raw;
     struct sctp_initmsg init;
     struct sctp_sndrcvinfo  sndrcv;
 } sctp_cmsg_data_t;
 
 /* These are cmsg_types.  */
 typedef enum sctp_cmsg_type {
     SCTP_INIT,      /* 5.2.1 SCTP Initiation Structure */
 #define SCTP_INIT   SCTP_INIT
     SCTP_SNDRCV,        /* 5.2.2 SCTP Header Information Structure */
 #define SCTP_SNDRCV SCTP_SNDRCV
     SCTP_SNDINFO,       /* 5.3.4 SCTP Send Information Structure */
 #define SCTP_SNDINFO    SCTP_SNDINFO
     SCTP_RCVINFO,       /* 5.3.5 SCTP Receive Information Structure */
 #define SCTP_RCVINFO    SCTP_RCVINFO
     SCTP_NXTINFO,       /* 5.3.6 SCTP Next Receive Information Structure */
 #define SCTP_NXTINFO    SCTP_NXTINFO
     SCTP_PRINFO,        /* 5.3.7 SCTP PR-SCTP Information Structure */
 #define SCTP_PRINFO SCTP_PRINFO
     SCTP_AUTHINFO,      /* 5.3.8 SCTP AUTH Information Structure */
 #define SCTP_AUTHINFO   SCTP_AUTHINFO
     SCTP_DSTADDRV4,     /* 5.3.9 SCTP Destination IPv4 Address Structure */
 #define SCTP_DSTADDRV4  SCTP_DSTADDRV4
     SCTP_DSTADDRV6,     /* 5.3.10 SCTP Destination IPv6 Address Structure */
 #define SCTP_DSTADDRV6  SCTP_DSTADDRV6
 } 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[];
 };
 
 /*
  *   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,
     SCTP_ADDR_POTENTIALLY_FAILED,
 #define SCTP_ADDR_PF    SCTP_ADDR_POTENTIALLY_FAILED
 };
 
 
 /*
  * 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;
     __be16 sre_error;
     sctp_assoc_t sre_assoc_id;
     __u8 sre_data[];
 };
 
 
 /*
  * 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[];
 };
 
 struct sctp_send_failed_event {
     __u16 ssf_type;
     __u16 ssf_flags;
     __u32 ssf_length;
     __u32 ssf_error;
     struct sctp_sndinfo ssfe_info;
     sctp_assoc_t ssf_assoc_id;
     __u8 ssf_data[];
 };
 
 /*
  *   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;
     __u32 pdapi_stream;
     __u32 pdapi_seq;
 };
 
 enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
 
 /*
  * 5.3.1.8.  SCTP_AUTHENTICATION_EVENT
  *
  *  When a receiver is using authentication this message will provide
  *  notifications regarding new keys being made active as well as errors.
  */
 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_NEW_KEY,
 #define SCTP_AUTH_NEWKEY    SCTP_AUTH_NEW_KEY /* compatible with before */
     SCTP_AUTH_FREE_KEY,
     SCTP_AUTH_NO_AUTH,
 };
 
 /*
  * 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;
 };
 
 #define SCTP_STREAM_RESET_INCOMING_SSN  0x0001
 #define SCTP_STREAM_RESET_OUTGOING_SSN  0x0002
 #define SCTP_STREAM_RESET_DENIED    0x0004
 #define SCTP_STREAM_RESET_FAILED    0x0008
 struct sctp_stream_reset_event {
     __u16 strreset_type;
     __u16 strreset_flags;
     __u32 strreset_length;
     sctp_assoc_t strreset_assoc_id;
     __u16 strreset_stream_list[];
 };
 
 #define SCTP_ASSOC_RESET_DENIED     0x0004
 #define SCTP_ASSOC_RESET_FAILED     0x0008
 struct sctp_assoc_reset_event {
     __u16 assocreset_type;
     __u16 assocreset_flags;
     __u32 assocreset_length;
     sctp_assoc_t assocreset_assoc_id;
     __u32 assocreset_local_tsn;
     __u32 assocreset_remote_tsn;
 };
 
 #define SCTP_ASSOC_CHANGE_DENIED    0x0004
 #define SCTP_ASSOC_CHANGE_FAILED    0x0008
 #define SCTP_STREAM_CHANGE_DENIED   SCTP_ASSOC_CHANGE_DENIED
 #define SCTP_STREAM_CHANGE_FAILED   SCTP_ASSOC_CHANGE_FAILED
 struct sctp_stream_change_event {
     __u16 strchange_type;
     __u16 strchange_flags;
     __u32 strchange_length;
     sctp_assoc_t strchange_assoc_id;
     __u16 strchange_instrms;
     __u16 strchange_outstrms;
 };
 
 /*
  * 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;
     __u8 sctp_stream_reset_event;
     __u8 sctp_assoc_reset_event;
     __u8 sctp_stream_change_event;
     __u8 sctp_send_failure_event_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;
     struct sctp_stream_reset_event sn_strreset_event;
     struct sctp_assoc_reset_event sn_assocreset_event;
     struct sctp_stream_change_event sn_strchange_event;
     struct sctp_send_failed_event sn_send_failed_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_DATA_IO_EVENT  = SCTP_SN_TYPE_BASE,
 #define SCTP_DATA_IO_EVENT      SCTP_DATA_IO_EVENT
     SCTP_ASSOC_CHANGE,
 #define SCTP_ASSOC_CHANGE       SCTP_ASSOC_CHANGE
     SCTP_PEER_ADDR_CHANGE,
 #define SCTP_PEER_ADDR_CHANGE       SCTP_PEER_ADDR_CHANGE
     SCTP_SEND_FAILED,
 #define SCTP_SEND_FAILED        SCTP_SEND_FAILED
     SCTP_REMOTE_ERROR,
 #define SCTP_REMOTE_ERROR       SCTP_REMOTE_ERROR
     SCTP_SHUTDOWN_EVENT,
 #define SCTP_SHUTDOWN_EVENT     SCTP_SHUTDOWN_EVENT
     SCTP_PARTIAL_DELIVERY_EVENT,
 #define SCTP_PARTIAL_DELIVERY_EVENT SCTP_PARTIAL_DELIVERY_EVENT
     SCTP_ADAPTATION_INDICATION,
 #define SCTP_ADAPTATION_INDICATION  SCTP_ADAPTATION_INDICATION
     SCTP_AUTHENTICATION_EVENT,
 #define SCTP_AUTHENTICATION_INDICATION  SCTP_AUTHENTICATION_EVENT
     SCTP_SENDER_DRY_EVENT,
 #define SCTP_SENDER_DRY_EVENT       SCTP_SENDER_DRY_EVENT
     SCTP_STREAM_RESET_EVENT,
 #define SCTP_STREAM_RESET_EVENT     SCTP_STREAM_RESET_EVENT
     SCTP_ASSOC_RESET_EVENT,
 #define SCTP_ASSOC_RESET_EVENT      SCTP_ASSOC_RESET_EVENT
     SCTP_STREAM_CHANGE_EVENT,
 #define SCTP_STREAM_CHANGE_EVENT    SCTP_STREAM_CHANGE_EVENT
     SCTP_SEND_FAILED_EVENT,
 #define SCTP_SEND_FAILED_EVENT      SCTP_SEND_FAILED_EVENT
     SCTP_SN_TYPE_MAX    = SCTP_SEND_FAILED_EVENT,
 #define SCTP_SN_TYPE_MAX        SCTP_SN_TYPE_MAX
 };
 
 /* 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)));
 
 /* For backward compatibility use, define the old name too */
 #define sctp_setprim    sctp_prim
 
 /*
  * 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 */
     SPP_IPV6_FLOWLABEL = 1<<8,
     SPP_DSCP = 1<<9,
 };
 
 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;
     __u32           spp_ipv6_flowlabel;
     __u8            spp_dscp;
 } __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.
  */
 #ifndef __KERNEL__
 /* This here is only used by user space as is. It might not be a good idea
  * to export/reveal the whole structure with reserved fields etc.
  */
 enum {
     SCTP_AUTH_HMAC_ID_SHA1 = 1,
     SCTP_AUTH_HMAC_ID_SHA256 = 3,
 };
 #endif
 
 struct sctp_hmacalgo {
     __u32       shmac_num_idents;
     __u16       shmac_idents[];
 };
 
 /* Sadly, user and kernel space have different names for
  * this structure member, so this is to not break anything.
  */
 #define shmac_number_of_idents  shmac_num_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;
 };
 
 struct sctp_stream_value {
     sctp_assoc_t assoc_id;
     uint16_t stream_id;
     uint16_t stream_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,
 #define SCTP_POTENTIALLY_FAILED     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[];
 };
 
 /* The broken spelling has been released already in lksctp-tools header,
  * so don't break anyone, now that it's fixed.
  */
 #define guth_number_of_chunks   gauth_number_of_chunks
 
 /* Association states.  */
 enum sctp_sstat_state {
     SCTP_EMPTY                = 0,
     SCTP_CLOSED               = 1,
     SCTP_COOKIE_WAIT          = 2,
     SCTP_COOKIE_ECHOED        = 3,
     SCTP_ESTABLISHED          = 4,
     SCTP_SHUTDOWN_PENDING     = 5,
     SCTP_SHUTDOWN_SENT        = 6,
     SCTP_SHUTDOWN_RECEIVED    = 7,
     SCTP_SHUTDOWN_ACK_SENT    = 8,
 };
 
 /*
  * 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;
 #ifdef __KERNEL__
     struct sockaddr     __user *addrs;
 #else
     struct sockaddr     *addrs;
 #endif
 };
 
 struct sctp_getaddrs {
     sctp_assoc_t        assoc_id; /*input*/
     __u32           addr_num; /*output*/
     __u8            addrs[]; /*output, variable size*/
 };
 
 /* A socket user request obtained via SCTP_GET_ASSOC_STATS that retrieves
  * association stats. All stats are counts except sas_maxrto and
  * sas_obs_rto_ipaddr. maxrto is the max observed rto + transport since
  * the last call. Will return 0 when RTO was not update since last call
  */
 struct sctp_assoc_stats {
     sctp_assoc_t    sas_assoc_id;    /* Input */
                      /* Transport of observed max RTO */
     struct sockaddr_storage sas_obs_rto_ipaddr;
     __u64       sas_maxrto;      /* Maximum Observed RTO for period */
     __u64       sas_isacks;  /* SACKs received */
     __u64       sas_osacks;  /* SACKs sent */
     __u64       sas_opackets;    /* Packets sent */
     __u64       sas_ipackets;    /* Packets received */
     __u64       sas_rtxchunks;   /* Retransmitted Chunks */
     __u64       sas_outofseqtsns;/* TSN received > next expected */
     __u64       sas_idupchunks;  /* Dups received (ordered+unordered) */
     __u64       sas_gapcnt;      /* Gap Acknowledgements Received */
     __u64       sas_ouodchunks;  /* Unordered data chunks sent */
     __u64       sas_iuodchunks;  /* Unordered data chunks received */
     __u64       sas_oodchunks;   /* Ordered data chunks sent */
     __u64       sas_iodchunks;   /* Ordered data chunks received */
     __u64       sas_octrlchunks; /* Control chunks sent */
     __u64       sas_ictrlchunks; /* Control chunks received */
 };
 
 /*
  * 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;
 
 typedef struct {
     sctp_peeloff_arg_t p_arg;
     unsigned flags;
 } sctp_peeloff_flags_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;
 };
 
 /* Use a new structure with spt_pathcpthld for back compatibility */
 struct sctp_paddrthlds_v2 {
     sctp_assoc_t spt_assoc_id;
     struct sockaddr_storage spt_address;
     __u16 spt_pathmaxrxt;
     __u16 spt_pathpfthld;
     __u16 spt_pathcpthld;
 };
 
 /*
  * Socket Option for Getting the Association/Stream-Specific PR-SCTP Status
  */
 struct sctp_prstatus {
     sctp_assoc_t sprstat_assoc_id;
     __u16 sprstat_sid;
     __u16 sprstat_policy;
     __u64 sprstat_abandoned_unsent;
     __u64 sprstat_abandoned_sent;
 };
 
 struct sctp_default_prinfo {
     sctp_assoc_t pr_assoc_id;
     __u32 pr_value;
     __u16 pr_policy;
 };
 
 struct sctp_info {
     __u32   sctpi_tag;
     __u32   sctpi_state;
     __u32   sctpi_rwnd;
     __u16   sctpi_unackdata;
     __u16   sctpi_penddata;
     __u16   sctpi_instrms;
     __u16   sctpi_outstrms;
     __u32   sctpi_fragmentation_point;
     __u32   sctpi_inqueue;
     __u32   sctpi_outqueue;
     __u32   sctpi_overall_error;
     __u32   sctpi_max_burst;
     __u32   sctpi_maxseg;
     __u32   sctpi_peer_rwnd;
     __u32   sctpi_peer_tag;
     __u8    sctpi_peer_capable;
     __u8    sctpi_peer_sack;
     __u16   __reserved1;
 
     /* assoc status info */
     __u64   sctpi_isacks;
     __u64   sctpi_osacks;
     __u64   sctpi_opackets;
     __u64   sctpi_ipackets;
     __u64   sctpi_rtxchunks;
     __u64   sctpi_outofseqtsns;
     __u64   sctpi_idupchunks;
     __u64   sctpi_gapcnt;
     __u64   sctpi_ouodchunks;
     __u64   sctpi_iuodchunks;
     __u64   sctpi_oodchunks;
     __u64   sctpi_iodchunks;
     __u64   sctpi_octrlchunks;
     __u64   sctpi_ictrlchunks;
 
     /* primary transport info */
     struct sockaddr_storage sctpi_p_address;
     __s32   sctpi_p_state;
     __u32   sctpi_p_cwnd;
     __u32   sctpi_p_srtt;
     __u32   sctpi_p_rto;
     __u32   sctpi_p_hbinterval;
     __u32   sctpi_p_pathmaxrxt;
     __u32   sctpi_p_sackdelay;
     __u32   sctpi_p_sackfreq;
     __u32   sctpi_p_ssthresh;
     __u32   sctpi_p_partial_bytes_acked;
     __u32   sctpi_p_flight_size;
     __u16   sctpi_p_error;
     __u16   __reserved2;
 
     /* sctp sock info */
     __u32   sctpi_s_autoclose;
     __u32   sctpi_s_adaptation_ind;
     __u32   sctpi_s_pd_point;
     __u8    sctpi_s_nodelay;
     __u8    sctpi_s_disable_fragments;
     __u8    sctpi_s_v4mapped;
     __u8    sctpi_s_frag_interleave;
     __u32   sctpi_s_type;
     __u32   __reserved3;
 };
 
 struct sctp_reset_streams {
     sctp_assoc_t srs_assoc_id;
     uint16_t srs_flags;
     uint16_t srs_number_streams;    /* 0 == ALL */
     uint16_t srs_stream_list[]; /* list if srs_num_streams is not 0 */
 };
 
 struct sctp_add_streams {
     sctp_assoc_t sas_assoc_id;
     uint16_t sas_instrms;
     uint16_t sas_outstrms;
 };
 
 struct sctp_event {
     sctp_assoc_t se_assoc_id;
     uint16_t se_type;
     uint8_t se_on;
 };
 
 struct sctp_udpencaps {
     sctp_assoc_t sue_assoc_id;
     struct sockaddr_storage sue_address;
     uint16_t sue_port;
 };
 
 /* SCTP Stream schedulers */
 enum sctp_sched_type {
     SCTP_SS_FCFS,
     SCTP_SS_DEFAULT = SCTP_SS_FCFS,
     SCTP_SS_PRIO,
     SCTP_SS_RR,
     SCTP_SS_MAX = SCTP_SS_RR
 };
 
 /* Probe Interval socket option */
 struct sctp_probeinterval {
     sctp_assoc_t spi_assoc_id;
     struct sockaddr_storage spi_address;
     __u32 spi_interval;
 };
 
 #endif /* _UAPI_SCTP_H */

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