/*-
 * Copyright (c) 2009-2010 Brad Penoff
 * Copyright (c) 2009-2010 Humaira Kamal
 * Copyright (c) 2011-2012 Irene Ruengeler
 * Copyright (c) 2011-2012 Michael Tuexen
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef __USRSCTP_H__
#define __USRSCTP_H__

#ifdef  __cplusplus
extern "C" {
#endif

/*  to make sure some OSs define in6_pktinfo */
#define _GNU_SOURCE

#include <sys/types.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <ws2ipdef.h>
#include <ws2def.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#endif

#ifndef MSG_NOTIFICATION
/* This definition MUST be in sync with usrsctplib/user_socketvar.h */
#define MSG_NOTIFICATION 0x2000
#endif

#ifndef IPPROTO_SCTP
/* This is the IANA assigned protocol number of SCTP. */
#define IPPROTO_SCTP 132
#endif

#ifdef _WIN32
#if defined(_MSC_VER) && _MSC_VER >= 1600
#include <stdint.h>
#elif defined(SCTP_STDINT_INCLUDE)
#include SCTP_STDINT_INCLUDE
#else
#define uint8_t   unsigned __int8
#define uint16_t  unsigned __int16
#define uint32_t  unsigned __int32
#define int16_t   __int16
#define int32_t   __int32
#endif

#define ssize_t   __int64
#define MSG_EOR   0x8
#ifndef EWOULDBLOCK
#define EWOULDBLOCK  WSAEWOULDBLOCK
#endif
#define SHUT_RD    1
#define SHUT_WR    2
#define SHUT_RDWR  3
#endif

typedef uint32_t sctp_assoc_t;

#define AF_CONN 123
/* The definition of struct sockaddr_conn MUST be in
 * tune with other sockaddr_* structures.
 */
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
struct sockaddr_conn {
	uint8_t sconn_len;
	uint8_t sconn_family;
	uint16_t sconn_port;
	void *sconn_addr;
};
#else
struct sockaddr_conn {
	uint16_t sconn_family;
	uint16_t sconn_port;
	void *sconn_addr;
};
#endif

union sctp_sockstore {
#if defined(INET)
	struct sockaddr_in sin;
#endif
#if defined(INET6)
	struct sockaddr_in6 sin6;
#endif
	struct sockaddr_conn sconn;
	struct sockaddr sa;
};

#define SCTP_FUTURE_ASSOC  0
#define SCTP_CURRENT_ASSOC 1
#define SCTP_ALL_ASSOC     2

/***  Structures and definitions to use the socket API  ***/

#define SCTP_ALIGN_RESV_PAD 92
#define SCTP_ALIGN_RESV_PAD_SHORT 76

struct sctp_rcvinfo {
	uint16_t rcv_sid;
	uint16_t rcv_ssn;
	uint16_t rcv_flags;
	uint32_t rcv_ppid;
	uint32_t rcv_tsn;
	uint32_t rcv_cumtsn;
	uint32_t rcv_context;
	sctp_assoc_t rcv_assoc_id;
};

struct sctp_nxtinfo {
	uint16_t nxt_sid;
	uint16_t nxt_flags;
	uint32_t nxt_ppid;
	uint32_t nxt_length;
	sctp_assoc_t nxt_assoc_id;
};

#define SCTP_NO_NEXT_MSG           0x0000
#define SCTP_NEXT_MSG_AVAIL        0x0001
#define SCTP_NEXT_MSG_ISCOMPLETE   0x0002
#define SCTP_NEXT_MSG_IS_UNORDERED 0x0004
#define SCTP_NEXT_MSG_IS_NOTIFICATION 0x0008

struct sctp_recvv_rn {
	struct sctp_rcvinfo recvv_rcvinfo;
	struct sctp_nxtinfo recvv_nxtinfo;
};

#define SCTP_RECVV_NOINFO  0
#define SCTP_RECVV_RCVINFO 1
#define SCTP_RECVV_NXTINFO 2
#define SCTP_RECVV_RN      3

#define SCTP_SENDV_NOINFO   0
#define SCTP_SENDV_SNDINFO  1
#define SCTP_SENDV_PRINFO   2
#define SCTP_SENDV_AUTHINFO 3
#define SCTP_SENDV_SPA      4

#define SCTP_SEND_SNDINFO_VALID  0x00000001
#define SCTP_SEND_PRINFO_VALID   0x00000002
#define SCTP_SEND_AUTHINFO_VALID 0x00000004

struct sctp_snd_all_completes {
	uint16_t sall_stream;
	uint16_t sall_flags;
	uint32_t sall_ppid;
	uint32_t sall_context;
	uint32_t sall_num_sent;
	uint32_t sall_num_failed;
};

struct sctp_sndinfo {
	uint16_t snd_sid;
	uint16_t snd_flags;
	uint32_t snd_ppid;
	uint32_t snd_context;
	sctp_assoc_t snd_assoc_id;
};

struct sctp_prinfo {
	uint16_t pr_policy;
	uint32_t pr_value;
};

struct sctp_authinfo {
	uint16_t auth_keynumber;
};

struct sctp_sendv_spa {
	uint32_t sendv_flags;
	struct sctp_sndinfo sendv_sndinfo;
	struct sctp_prinfo sendv_prinfo;
	struct sctp_authinfo sendv_authinfo;
};

struct sctp_udpencaps {
	struct sockaddr_storage sue_address;
	uint32_t sue_assoc_id;
	uint16_t sue_port;
};

/********  Notifications  **************/

/* notification types */
#define SCTP_ASSOC_CHANGE                 0x0001
#define SCTP_PEER_ADDR_CHANGE             0x0002
#define SCTP_REMOTE_ERROR                 0x0003
#define SCTP_SEND_FAILED                  0x0004
#define SCTP_SHUTDOWN_EVENT               0x0005
#define SCTP_ADAPTATION_INDICATION        0x0006
#define SCTP_PARTIAL_DELIVERY_EVENT       0x0007
#define SCTP_AUTHENTICATION_EVENT         0x0008
#define SCTP_STREAM_RESET_EVENT           0x0009
#define SCTP_SENDER_DRY_EVENT             0x000a
#define SCTP_NOTIFICATIONS_STOPPED_EVENT  0x000b
#define SCTP_ASSOC_RESET_EVENT            0x000c
#define SCTP_STREAM_CHANGE_EVENT          0x000d
#define SCTP_SEND_FAILED_EVENT            0x000e

/* notification event structures */


/* association change event */
struct sctp_assoc_change {
	uint16_t sac_type;
	uint16_t sac_flags;
	uint32_t sac_length;
	uint16_t sac_state;
	uint16_t sac_error;
	uint16_t sac_outbound_streams;
	uint16_t sac_inbound_streams;
	sctp_assoc_t sac_assoc_id;
	uint8_t sac_info[]; /* not available yet */
};

/* sac_state values */
#define SCTP_COMM_UP        0x0001
#define SCTP_COMM_LOST      0x0002
#define SCTP_RESTART        0x0003
#define SCTP_SHUTDOWN_COMP  0x0004
#define SCTP_CANT_STR_ASSOC 0x0005

/* sac_info values */
#define SCTP_ASSOC_SUPPORTS_PR        0x01
#define SCTP_ASSOC_SUPPORTS_AUTH      0x02
#define SCTP_ASSOC_SUPPORTS_ASCONF    0x03
#define SCTP_ASSOC_SUPPORTS_MULTIBUF  0x04
#define SCTP_ASSOC_SUPPORTS_RE_CONFIG 0x05
#define SCTP_ASSOC_SUPPORTS_MAX       0x05

/* Address event */
struct sctp_paddr_change {
	uint16_t spc_type;
	uint16_t spc_flags;
	uint32_t spc_length;
	struct sockaddr_storage spc_aaddr;
	uint32_t spc_state;
	uint32_t spc_error;
	sctp_assoc_t spc_assoc_id;
	uint8_t spc_padding[4];
};

/* paddr state values */
#define SCTP_ADDR_AVAILABLE   0x0001
#define SCTP_ADDR_UNREACHABLE 0x0002
#define SCTP_ADDR_REMOVED     0x0003
#define SCTP_ADDR_ADDED       0x0004
#define SCTP_ADDR_MADE_PRIM   0x0005
#define SCTP_ADDR_CONFIRMED   0x0006

/* remote error events */
struct sctp_remote_error {
	uint16_t sre_type;
	uint16_t sre_flags;
	uint32_t sre_length;
	uint16_t sre_error;
	sctp_assoc_t sre_assoc_id;
	uint8_t sre_data[4];
};

/* shutdown event */
struct sctp_shutdown_event {
	uint16_t sse_type;
	uint16_t sse_flags;
	uint32_t sse_length;
	sctp_assoc_t sse_assoc_id;
};

/* Adaptation layer indication */
struct sctp_adaptation_event {
	uint16_t sai_type;
	uint16_t sai_flags;
	uint32_t sai_length;
	uint32_t sai_adaptation_ind;
	sctp_assoc_t sai_assoc_id;
};

/* Partial delivery event */
struct sctp_pdapi_event {
	uint16_t pdapi_type;
	uint16_t pdapi_flags;
	uint32_t pdapi_length;
	uint32_t pdapi_indication;
	uint32_t pdapi_stream;
	uint32_t pdapi_seq;
	sctp_assoc_t pdapi_assoc_id;
};

/* indication values */
#define SCTP_PARTIAL_DELIVERY_ABORTED  0x0001

/* SCTP authentication event */
struct sctp_authkey_event {
	uint16_t auth_type;
	uint16_t auth_flags;
	uint32_t auth_length;
	uint16_t auth_keynumber;
	uint32_t auth_indication;
	sctp_assoc_t auth_assoc_id;
};

/* indication values */
#define SCTP_AUTH_NEW_KEY   0x0001
#define SCTP_AUTH_NO_AUTH   0x0002
#define SCTP_AUTH_FREE_KEY  0x0003

/* SCTP sender dry event */
struct sctp_sender_dry_event {
	uint16_t sender_dry_type;
	uint16_t sender_dry_flags;
	uint32_t sender_dry_length;
	sctp_assoc_t sender_dry_assoc_id;
};


/* Stream reset event - subscribe to SCTP_STREAM_RESET_EVENT */
struct sctp_stream_reset_event {
	uint16_t strreset_type;
	uint16_t strreset_flags;
	uint32_t strreset_length;
	sctp_assoc_t strreset_assoc_id;
	uint16_t strreset_stream_list[];
};

/* flags in stream_reset_event (strreset_flags) */
#define SCTP_STREAM_RESET_INCOMING_SSN  0x0001
#define SCTP_STREAM_RESET_OUTGOING_SSN  0x0002
#define SCTP_STREAM_RESET_DENIED        0x0004 /* SCTP_STRRESET_FAILED */
#define SCTP_STREAM_RESET_FAILED        0x0008 /* SCTP_STRRESET_FAILED */
#define SCTP_STREAM_CHANGED_DENIED      0x0010

#define SCTP_STREAM_RESET_INCOMING      0x00000001
#define SCTP_STREAM_RESET_OUTGOING      0x00000002


/* Assoc reset event - subscribe to SCTP_ASSOC_RESET_EVENT */
struct sctp_assoc_reset_event {
	uint16_t assocreset_type;
	uint16_t assocreset_flags;
	uint32_t assocreset_length;
	sctp_assoc_t assocreset_assoc_id;
	uint32_t assocreset_local_tsn;
	uint32_t assocreset_remote_tsn;
};

#define SCTP_ASSOC_RESET_DENIED        0x0004
#define SCTP_ASSOC_RESET_FAILED        0x0008


/* Stream change event - subscribe to SCTP_STREAM_CHANGE_EVENT */
struct sctp_stream_change_event {
	uint16_t strchange_type;
	uint16_t strchange_flags;
	uint32_t strchange_length;
	sctp_assoc_t strchange_assoc_id;
	uint16_t strchange_instrms;
	uint16_t strchange_outstrms;
};

#define SCTP_STREAM_CHANGE_DENIED	0x0004
#define SCTP_STREAM_CHANGE_FAILED	0x0008


/* SCTP send failed event */
struct sctp_send_failed_event {
	uint16_t ssfe_type;
	uint16_t ssfe_flags;
	uint32_t ssfe_length;
	uint32_t ssfe_error;
	struct sctp_sndinfo ssfe_info;
	sctp_assoc_t ssfe_assoc_id;
	uint8_t  ssfe_data[];
};

/* flag that indicates state of data */
#define SCTP_DATA_UNSENT  0x0001	/* inqueue never on wire */
#define SCTP_DATA_SENT    0x0002	/* on wire at failure */

/* SCTP event option */
struct sctp_event {
	sctp_assoc_t   se_assoc_id;
	uint16_t       se_type;
	uint8_t        se_on;
};

union sctp_notification {
	struct sctp_tlv {
		uint16_t sn_type;
		uint16_t sn_flags;
		uint32_t 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_shutdown_event sn_shutdown_event;
	struct sctp_adaptation_event sn_adaptation_event;
	struct sctp_pdapi_event sn_pdapi_event;
	struct sctp_authkey_event sn_auth_event;
	struct sctp_sender_dry_event sn_sender_dry_event;
	struct sctp_send_failed_event sn_send_failed_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_event_subscribe {
	uint8_t sctp_data_io_event;
	uint8_t sctp_association_event;
	uint8_t sctp_address_event;
	uint8_t sctp_send_failure_event;
	uint8_t sctp_peer_error_event;
	uint8_t sctp_shutdown_event;
	uint8_t sctp_partial_delivery_event;
	uint8_t sctp_adaptation_layer_event;
	uint8_t sctp_authentication_event;
	uint8_t sctp_sender_dry_event;
	uint8_t sctp_stream_reset_event;
};



/* Flags that go into the sinfo->sinfo_flags field */
#define SCTP_NOTIFICATION     0x0010 /* next message is a notification */
#define SCTP_COMPLETE         0x0020 /* next message is complete */
#define SCTP_EOF              0x0100 /* Start shutdown procedures */
#define SCTP_ABORT            0x0200 /* Send an ABORT to peer */
#define SCTP_UNORDERED        0x0400 /* Message is un-ordered */
#define SCTP_ADDR_OVER        0x0800 /* Override the primary-address */
#define SCTP_SENDALL          0x1000 /* Send this on all associations */
#define SCTP_EOR              0x2000 /* end of message signal */
#define SCTP_SACK_IMMEDIATELY 0x4000 /* Set I-Bit */

#define INVALID_SINFO_FLAG(x) (((x) & 0xfffffff0 \
                                    & ~(SCTP_EOF | SCTP_ABORT | SCTP_UNORDERED |\
				        SCTP_ADDR_OVER | SCTP_SENDALL | SCTP_EOR |\
					SCTP_SACK_IMMEDIATELY)) != 0)
/* for the endpoint */

/* The lower byte is an enumeration of PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000 /* Reliable transfer */
#define SCTP_PR_SCTP_TTL  0x0001 /* Time based PR-SCTP */
#define SCTP_PR_SCTP_BUF  0x0002 /* Buffer based PR-SCTP */
#define SCTP_PR_SCTP_RTX  0x0003 /* Number of retransmissions based PR-SCTP */

#define PR_SCTP_POLICY(x)         ((x) & 0x0f)
#define PR_SCTP_ENABLED(x)        (PR_SCTP_POLICY(x) != SCTP_PR_SCTP_NONE)
#define PR_SCTP_TTL_ENABLED(x)    (PR_SCTP_POLICY(x) == SCTP_PR_SCTP_TTL)
#define PR_SCTP_BUF_ENABLED(x)    (PR_SCTP_POLICY(x) == SCTP_PR_SCTP_BUF)
#define PR_SCTP_RTX_ENABLED(x)    (PR_SCTP_POLICY(x) == SCTP_PR_SCTP_RTX)
#define PR_SCTP_INVALID_POLICY(x) (PR_SCTP_POLICY(x) > SCTP_PR_SCTP_RTX)


/*
 * user socket options: socket API defined
 */
/*
 * read-write options
 */
#define SCTP_RTOINFO                    0x00000001
#define SCTP_ASSOCINFO                  0x00000002
#define SCTP_INITMSG                    0x00000003
#define SCTP_NODELAY                    0x00000004
#define SCTP_AUTOCLOSE                  0x00000005
#define SCTP_PRIMARY_ADDR               0x00000007
#define SCTP_ADAPTATION_LAYER           0x00000008
#define SCTP_DISABLE_FRAGMENTS          0x00000009
#define SCTP_PEER_ADDR_PARAMS           0x0000000a
/* ancillary data/notification interest options */
/* Without this applied we will give V4 and V6 addresses on a V6 socket */
#define SCTP_I_WANT_MAPPED_V4_ADDR      0x0000000d
#define SCTP_MAXSEG                     0x0000000e
#define SCTP_DELAYED_SACK               0x0000000f
#define SCTP_FRAGMENT_INTERLEAVE        0x00000010
#define SCTP_PARTIAL_DELIVERY_POINT     0x00000011
/* authentication support */
#define SCTP_HMAC_IDENT                 0x00000014
#define SCTP_AUTH_ACTIVE_KEY            0x00000015
#define SCTP_AUTO_ASCONF                0x00000018
#define SCTP_MAX_BURST                  0x00000019
/* assoc level context */
#define SCTP_CONTEXT                    0x0000001a
/* explicit EOR signalling */
#define SCTP_EXPLICIT_EOR               0x0000001b
#define SCTP_REUSE_PORT                 0x0000001c

#define SCTP_EVENT                      0x0000001e
#define SCTP_RECVRCVINFO                0x0000001f
#define SCTP_RECVNXTINFO                0x00000020
#define SCTP_DEFAULT_SNDINFO            0x00000021
#define SCTP_DEFAULT_PRINFO             0x00000022
#define SCTP_REMOTE_UDP_ENCAPS_PORT     0x00000024

#define SCTP_ENABLE_STREAM_RESET        0x00000900 /* struct sctp_assoc_value */

/*
 * read-only options
 */
#define SCTP_STATUS                     0x00000100
#define SCTP_GET_PEER_ADDR_INFO         0x00000101
/* authentication support */
#define SCTP_PEER_AUTH_CHUNKS           0x00000102
#define SCTP_LOCAL_AUTH_CHUNKS          0x00000103
#define SCTP_GET_ASSOC_NUMBER           0x00000104
#define SCTP_GET_ASSOC_ID_LIST          0x00000105

/*
 * write-only options
 */
#define SCTP_SET_PEER_PRIMARY_ADDR      0x00000006
#define SCTP_AUTH_CHUNK                 0x00000012
#define SCTP_AUTH_KEY                   0x00000013
#define SCTP_AUTH_DEACTIVATE_KEY        0x0000001d
#define SCTP_AUTH_DELETE_KEY            0x00000016
#define SCTP_RESET_STREAMS              0x00000901 /* struct sctp_reset_streams */
#define SCTP_RESET_ASSOC                0x00000902 /* sctp_assoc_t */
#define SCTP_ADD_STREAMS                0x00000903 /* struct sctp_add_streams */

struct sctp_initmsg {
	uint16_t sinit_num_ostreams;
	uint16_t sinit_max_instreams;
	uint16_t sinit_max_attempts;
	uint16_t sinit_max_init_timeo;
};

struct sctp_rtoinfo {
	sctp_assoc_t srto_assoc_id;
	uint32_t srto_initial;
	uint32_t srto_max;
	uint32_t srto_min;
};

struct sctp_assocparams {
	sctp_assoc_t sasoc_assoc_id;
	uint32_t sasoc_peer_rwnd;
	uint32_t sasoc_local_rwnd;
	uint32_t sasoc_cookie_life;
	uint16_t sasoc_asocmaxrxt;
	uint16_t sasoc_number_peer_destinations;
};

struct sctp_setprim {
	struct sockaddr_storage ssp_addr;
	sctp_assoc_t ssp_assoc_id;
	uint8_t ssp_padding[4];
};

struct sctp_setadaptation {
	uint32_t   ssb_adaptation_ind;
};

struct sctp_paddrparams {
	struct sockaddr_storage spp_address;
	sctp_assoc_t spp_assoc_id;
	uint32_t spp_hbinterval;
	uint32_t spp_pathmtu;
	uint32_t spp_flags;
	uint32_t spp_ipv6_flowlabel;
	uint16_t spp_pathmaxrxt;
	uint8_t spp_dscp;
};

#define SPP_HB_ENABLE       0x00000001
#define SPP_HB_DISABLE      0x00000002
#define SPP_HB_DEMAND       0x00000004
#define SPP_PMTUD_ENABLE    0x00000008
#define SPP_PMTUD_DISABLE   0x00000010
#define SPP_HB_TIME_IS_ZERO 0x00000080
#define SPP_IPV6_FLOWLABEL  0x00000100
#define SPP_DSCP            0x00000200

/* Used for SCTP_MAXSEG, SCTP_MAX_BURST, SCTP_ENABLE_STREAM_RESET, and SCTP_CONTEXT */
struct sctp_assoc_value {
	sctp_assoc_t assoc_id;
	uint32_t assoc_value;
};

/* To enable stream reset */
#define SCTP_ENABLE_RESET_STREAM_REQ  0x00000001
#define SCTP_ENABLE_RESET_ASSOC_REQ   0x00000002
#define SCTP_ENABLE_CHANGE_ASSOC_REQ  0x00000004
#define SCTP_ENABLE_VALUE_MASK        0x00000007

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 strrst_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_hmacalgo {
	uint32_t shmac_number_of_idents;
	uint16_t shmac_idents[];
};

/* AUTH hmac_id */
#define SCTP_AUTH_HMAC_ID_RSVD    0x0000
#define SCTP_AUTH_HMAC_ID_SHA1    0x0001	/* default, mandatory */
#define SCTP_AUTH_HMAC_ID_SHA256  0x0003
#define SCTP_AUTH_HMAC_ID_SHA224  0x0004
#define SCTP_AUTH_HMAC_ID_SHA384  0x0005
#define SCTP_AUTH_HMAC_ID_SHA512  0x0006


struct sctp_sack_info {
	sctp_assoc_t sack_assoc_id;
	uint32_t sack_delay;
	uint32_t sack_freq;
};

struct sctp_default_prinfo {
	uint16_t pr_policy;
	uint32_t pr_value;
	sctp_assoc_t pr_assoc_id;
};

struct sctp_paddrinfo {
	struct sockaddr_storage spinfo_address;
	sctp_assoc_t spinfo_assoc_id;
	int32_t spinfo_state;
	uint32_t spinfo_cwnd;
	uint32_t spinfo_srtt;
	uint32_t spinfo_rto;
	uint32_t spinfo_mtu;
};

struct sctp_status {
	sctp_assoc_t sstat_assoc_id;
	int32_t  sstat_state;
	uint32_t sstat_rwnd;
	uint16_t sstat_unackdata;
	uint16_t sstat_penddata;
	uint16_t sstat_instrms;
	uint16_t sstat_outstrms;
	uint32_t sstat_fragmentation_point;
	struct sctp_paddrinfo sstat_primary;
};

/*
 * user state values
 */
#define SCTP_CLOSED             0x0000
#define SCTP_BOUND              0x1000
#define SCTP_LISTEN             0x2000
#define SCTP_COOKIE_WAIT        0x0002
#define SCTP_COOKIE_ECHOED      0x0004
#define SCTP_ESTABLISHED        0x0008
#define SCTP_SHUTDOWN_SENT      0x0010
#define SCTP_SHUTDOWN_RECEIVED  0x0020
#define SCTP_SHUTDOWN_ACK_SENT  0x0040
#define SCTP_SHUTDOWN_PENDING   0x0080


#define SCTP_ACTIVE       0x0001  /* SCTP_ADDR_REACHABLE */
#define SCTP_INACTIVE     0x0002  /* neither SCTP_ADDR_REACHABLE
                                     nor SCTP_ADDR_UNCONFIRMED */
#define SCTP_UNCONFIRMED  0x0200  /* SCTP_ADDR_UNCONFIRMED */

struct sctp_authchunks {
	sctp_assoc_t gauth_assoc_id;
/*	uint32_t gauth_number_of_chunks; not available */
	uint8_t  gauth_chunks[];
};

struct sctp_assoc_ids {
	uint32_t gaids_number_of_ids;
	sctp_assoc_t gaids_assoc_id[];
};

struct sctp_setpeerprim {
	struct sockaddr_storage sspp_addr;
	sctp_assoc_t sspp_assoc_id;
	uint8_t sspp_padding[4];
};

struct sctp_authchunk {
	uint8_t sauth_chunk;
};


struct sctp_get_nonce_values {
	sctp_assoc_t gn_assoc_id;
	uint32_t gn_peers_tag;
	uint32_t gn_local_tag;
};


/*
 * Main SCTP chunk types
 */
/************0x00 series ***********/
#define SCTP_DATA               0x00
#define SCTP_INITIATION         0x01
#define SCTP_INITIATION_ACK     0x02
#define SCTP_SELECTIVE_ACK      0x03
#define SCTP_HEARTBEAT_REQUEST  0x04
#define SCTP_HEARTBEAT_ACK      0x05
#define SCTP_ABORT_ASSOCIATION  0x06
#define SCTP_SHUTDOWN           0x07
#define SCTP_SHUTDOWN_ACK       0x08
#define SCTP_OPERATION_ERROR    0x09
#define SCTP_COOKIE_ECHO        0x0a
#define SCTP_COOKIE_ACK         0x0b
#define SCTP_ECN_ECHO           0x0c
#define SCTP_ECN_CWR            0x0d
#define SCTP_SHUTDOWN_COMPLETE  0x0e
/* RFC4895 */
#define SCTP_AUTHENTICATION     0x0f
/* EY nr_sack chunk id*/
#define SCTP_NR_SELECTIVE_ACK   0x10
/************0x40 series ***********/
/************0x80 series ***********/
/* RFC5061 */
#define	SCTP_ASCONF_ACK         0x80
/* draft-ietf-stewart-pktdrpsctp */
#define SCTP_PACKET_DROPPED     0x81
/* draft-ietf-stewart-strreset-xxx */
#define SCTP_STREAM_RESET       0x82

/* RFC4820                         */
#define SCTP_PAD_CHUNK          0x84
/************0xc0 series ***********/
/* RFC3758 */
#define SCTP_FORWARD_CUM_TSN    0xc0
/* RFC5061 */
#define SCTP_ASCONF             0xc1

struct sctp_authkey {
	sctp_assoc_t sca_assoc_id;
	uint16_t sca_keynumber;
	uint16_t sca_keylength;
	uint8_t  sca_key[];
};

struct sctp_authkeyid {
	sctp_assoc_t scact_assoc_id;
	uint16_t scact_keynumber;
};

struct sctp_cc_option {
	int option;
	struct sctp_assoc_value aid_value;
};

struct sctp_cwnd_args {
	struct sctp_nets *net;   /* network to */ /* FIXME: LP64 issue */
	uint32_t cwnd_new_value; /* cwnd in k */
	uint32_t pseudo_cumack;
	uint16_t inflight;       /* flightsize in k */
	uint16_t cwnd_augment;   /* increment to it */
	uint8_t meets_pseudo_cumack;
	uint8_t need_new_pseudo_cumack;
	uint8_t cnt_in_send;
	uint8_t cnt_in_str;
};

struct sctp_blk_args {
	uint32_t onsb;            /* in 1k bytes */
	uint32_t sndlen;          /* len of send being attempted */
	uint32_t peer_rwnd;       /* rwnd of peer */
	uint16_t send_sent_qcnt;  /* chnk cnt */
	uint16_t stream_qcnt;     /* chnk cnt */
	uint16_t chunks_on_oque;  /* chunks out */
	uint16_t flight_size;     /* flight size in k */
};

struct sctp_timeouts {
	sctp_assoc_t stimo_assoc_id;
	uint32_t stimo_init;
	uint32_t stimo_data;
	uint32_t stimo_sack;
	uint32_t stimo_shutdown;
	uint32_t stimo_heartbeat;
	uint32_t stimo_cookie;
	uint32_t stimo_shutdownack;
};


/* Standard TCP Congestion Control */
#define SCTP_CC_RFC2581         0x00000000
/* High Speed TCP Congestion Control (Floyd) */
#define SCTP_CC_HSTCP           0x00000001
/* HTCP Congestion Control */
#define SCTP_CC_HTCP            0x00000002
/* RTCC Congestion Control - RFC2581 plus */
#define SCTP_CC_RTCC            0x00000003

#define SCTP_CC_OPT_RTCC_SETMODE 0x00002000
#define SCTP_CC_OPT_USE_DCCC_EC  0x00002001
#define SCTP_CC_OPT_STEADY_STEP  0x00002002

#define SCTP_CMT_OFF            0
#define SCTP_CMT_BASE           1
#define SCTP_CMT_RPV1           2
#define SCTP_CMT_RPV2           3
#define SCTP_CMT_MPTCP          4
#define SCTP_CMT_MAX            SCTP_CMT_MPTCP

/* RS - Supported stream scheduling modules for pluggable
 * stream scheduling
 */
/* Default simple round-robin */
#define SCTP_SS_DEFAULT             0x00000000
/* Real round-robin */
#define SCTP_SS_ROUND_ROBIN         0x00000001
/* Real round-robin per packet */
#define SCTP_SS_ROUND_ROBIN_PACKET  0x00000002
/* Priority */
#define SCTP_SS_PRIORITY            0x00000003
/* Fair Bandwidth */
#define SCTP_SS_FAIR_BANDWITH       0x00000004
/* First-come, first-serve */
#define SCTP_SS_FIRST_COME          0x00000005

/******************** System calls *************/


void
usrsctp_init(uint16_t,
             int (*)(void *addr, void *buffer, size_t length, uint8_t tos, uint8_t set_df));


struct socket *
usrsctp_socket(int domain, int type, int protocol,
               int (*receive_cb)(struct socket *sock, union sctp_sockstore addr, void *data,
                                 size_t datalen, struct sctp_rcvinfo, int flags, void *ulp_info),
               int (*send_cb)(struct socket *sock, uint32_t sb_free),
               uint32_t sb_threshold,
               void *ulp_info);

int
usrsctp_setsockopt(struct socket *so,
                     int level,
                     int option_name,
                     const void *option_value,
                     socklen_t option_len);

int
usrsctp_getsockopt(struct socket *so,
                     int level,
                     int option_name,
                     void *option_value,
                     socklen_t *option_len);

ssize_t
usrsctp_sendv(struct socket *so,
                       const void *data,
                       size_t len,
                       struct sockaddr *to,
                       int addrcnt,
                       void *info,
                       socklen_t infolen,
                       unsigned int infotype,
                       int flags);

ssize_t
usrsctp_recvv(struct socket *so,
              void *dbuf,
              size_t len,
              struct sockaddr *from,
              socklen_t * fromlen,
              void *info,
              socklen_t *infolen,
              unsigned int *infotype,
              int *msg_flags);

int
usrsctp_bind(struct socket *so,
               struct sockaddr *name,
               socklen_t namelen);

int
usrsctp_bindx(struct socket *so,
                struct sockaddr *addrs,
                int addrcnt,
                int flags);

int
usrsctp_listen(struct socket *so,
                 int backlog);


struct socket *
usrsctp_accept(struct socket *so,
                 struct sockaddr * aname,
                 socklen_t * anamelen);


int
usrsctp_connect(struct socket *so,
                  struct sockaddr *name,
                  socklen_t namelen);

void
usrsctp_close(struct socket *so);

int
usrsctp_finish(void);

int
usrsctp_shutdown(struct socket *so, int how);

void
usrsctp_conninput(void *, const void *, size_t, uint8_t);

int
usrsctp_set_non_blocking(struct socket *, int);

int
usrsctp_get_non_blocking(struct socket *);

#define USRSCTP_SYSCTL_DECL(__field)           \
void usrsctp_sysctl_set_ ## __field(uint32_t value);\
uint32_t usrsctp_sysctl_get_ ## __field(void);

USRSCTP_SYSCTL_DECL(sctp_sendspace)
USRSCTP_SYSCTL_DECL(sctp_recvspace)
USRSCTP_SYSCTL_DECL(sctp_auto_asconf)
USRSCTP_SYSCTL_DECL(sctp_multiple_asconfs)
USRSCTP_SYSCTL_DECL(sctp_ecn_enable)
USRSCTP_SYSCTL_DECL(sctp_strict_sacks)
USRSCTP_SYSCTL_DECL(sctp_no_csum_on_loopback)
USRSCTP_SYSCTL_DECL(sctp_peer_chunk_oh)
USRSCTP_SYSCTL_DECL(sctp_max_burst_default)
USRSCTP_SYSCTL_DECL(sctp_max_chunks_on_queue)
USRSCTP_SYSCTL_DECL(sctp_hashtblsize)
USRSCTP_SYSCTL_DECL(sctp_pcbtblsize)
USRSCTP_SYSCTL_DECL(sctp_min_split_point)
USRSCTP_SYSCTL_DECL(sctp_chunkscale)
USRSCTP_SYSCTL_DECL(sctp_delayed_sack_time_default)
USRSCTP_SYSCTL_DECL(sctp_sack_freq_default)
USRSCTP_SYSCTL_DECL(sctp_system_free_resc_limit)
USRSCTP_SYSCTL_DECL(sctp_asoc_free_resc_limit)
USRSCTP_SYSCTL_DECL(sctp_heartbeat_interval_default)
USRSCTP_SYSCTL_DECL(sctp_pmtu_raise_time_default)
USRSCTP_SYSCTL_DECL(sctp_shutdown_guard_time_default)
USRSCTP_SYSCTL_DECL(sctp_secret_lifetime_default)
USRSCTP_SYSCTL_DECL(sctp_rto_max_default)
USRSCTP_SYSCTL_DECL(sctp_rto_min_default)
USRSCTP_SYSCTL_DECL(sctp_rto_initial_default)
USRSCTP_SYSCTL_DECL(sctp_init_rto_max_default)
USRSCTP_SYSCTL_DECL(sctp_valid_cookie_life_default)
USRSCTP_SYSCTL_DECL(sctp_init_rtx_max_default)
USRSCTP_SYSCTL_DECL(sctp_assoc_rtx_max_default)
USRSCTP_SYSCTL_DECL(sctp_path_rtx_max_default)
USRSCTP_SYSCTL_DECL(sctp_add_more_threshold)
USRSCTP_SYSCTL_DECL(sctp_nr_outgoing_streams_default)
USRSCTP_SYSCTL_DECL(sctp_cmt_on_off)
USRSCTP_SYSCTL_DECL(sctp_cmt_use_dac)
USRSCTP_SYSCTL_DECL(sctp_nr_sack_on_off)
USRSCTP_SYSCTL_DECL(sctp_use_cwnd_based_maxburst)
USRSCTP_SYSCTL_DECL(sctp_asconf_auth_nochk)
USRSCTP_SYSCTL_DECL(sctp_auth_disable)
USRSCTP_SYSCTL_DECL(sctp_nat_friendly)
USRSCTP_SYSCTL_DECL(sctp_L2_abc_variable)
USRSCTP_SYSCTL_DECL(sctp_mbuf_threshold_count)
USRSCTP_SYSCTL_DECL(sctp_do_drain)
USRSCTP_SYSCTL_DECL(sctp_hb_maxburst)
USRSCTP_SYSCTL_DECL(sctp_abort_if_one_2_one_hits_limit)
USRSCTP_SYSCTL_DECL(sctp_strict_data_order)
USRSCTP_SYSCTL_DECL(sctp_min_residual)
USRSCTP_SYSCTL_DECL(sctp_max_retran_chunk)
USRSCTP_SYSCTL_DECL(sctp_logging_level)
USRSCTP_SYSCTL_DECL(sctp_default_cc_module)
USRSCTP_SYSCTL_DECL(sctp_default_frag_interleave)
USRSCTP_SYSCTL_DECL(sctp_mobility_base)
USRSCTP_SYSCTL_DECL(sctp_mobility_fasthandoff)
USRSCTP_SYSCTL_DECL(sctp_inits_include_nat_friendly)
USRSCTP_SYSCTL_DECL(sctp_udp_tunneling_port)
USRSCTP_SYSCTL_DECL(sctp_enable_sack_immediately)
USRSCTP_SYSCTL_DECL(sctp_vtag_time_wait)
USRSCTP_SYSCTL_DECL(sctp_blackhole)
USRSCTP_SYSCTL_DECL(sctp_fr_max_burst_default)
USRSCTP_SYSCTL_DECL(sctp_path_pf_threshold)
USRSCTP_SYSCTL_DECL(sctp_default_ss_module)
USRSCTP_SYSCTL_DECL(sctp_rttvar_bw)
USRSCTP_SYSCTL_DECL(sctp_rttvar_rtt)
USRSCTP_SYSCTL_DECL(sctp_rttvar_eqret)
USRSCTP_SYSCTL_DECL(sctp_steady_step)
USRSCTP_SYSCTL_DECL(sctp_use_dccc_ecn)
USRSCTP_SYSCTL_DECL(sctp_buffer_splitting)
USRSCTP_SYSCTL_DECL(sctp_initial_cwnd)
#ifdef SCTP_DEBUG
USRSCTP_SYSCTL_DECL(sctp_debug_on)
/* More specific values can be found in sctp_constants, but
 * are not considered to be part of the API.
 */
#define SCTP_DEBUG_NONE 0x00000000
#define SCTP_DEBUG_ALL  0xffffffff
#endif
#undef USRSCTP_SYSCTL_DECL
#ifdef  __cplusplus
}
#endif
#endif
