/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
 */

#ifndef _NETINET_TCP_H
#define _NETINET_TCP_H	1

#include <features.h>

/*
 * User-settable options (used with setsockopt).
 */
#define	TCP_NODELAY	 1	/* Don't delay send to coalesce packets  */
#define	TCP_MAXSEG	 2	/* Set maximum segment size  */
#define TCP_CORK	 3	/* Control sending of partial frames  */
#define TCP_KEEPIDLE	 4	/* Start keeplives after this period */
#define TCP_KEEPINTVL	 5	/* Interval between keepalives */
#define TCP_KEEPCNT	 6	/* Number of keepalives before death */
#define TCP_SYNCNT	 7	/* Number of SYN retransmits */
#define TCP_LINGER2	 8	/* Life time of orphaned FIN-WAIT-2 state */
#define TCP_DEFER_ACCEPT 9	/* Wake up listener only when data arrive */
#define TCP_WINDOW_CLAMP 10	/* Bound advertised window */
#define TCP_INFO	 11	/* Information about this connection. */
#define	TCP_QUICKACK	 12	/* Bock/reenable quick ACKs.  */
#define TCP_CONGESTION	 13	/* Congestion control algorithm.  */
#define TCP_MD5SIG	 14	/* TCP MD5 Signature (RFC2385) */
#define TCP_COOKIE_TRANSACTIONS  15 /* TCP Cookie Transactions */
#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
#define TCP_THIN_DUPACK          17 /* Fast retrans. after 1 dupack */
#define TCP_USER_TIMEOUT         18 /* How long for loss retry before timeout */
#define TCP_REPAIR               19 /* TCP sock is under repair right now */
#define TCP_REPAIR_QUEUE         20 /* Set TCP queue to repair */
#define TCP_QUEUE_SEQ            21 /* Set sequence number of repaired queue. */
#define TCP_REPAIR_OPTIONS       22 /* Repair TCP connection options */
#define TCP_FASTOPEN             23 /* Enable FastOpen on listeners */
#define TCP_TIMESTAMP            24 /* TCP time stamp */

#ifdef __USE_MISC
# include <sys/types.h>
# include <sys/socket.h>
# include <stdint.h>

typedef	uint32_t tcp_seq;
/*
 * TCP header.
 * Per RFC 793, September, 1981.
 */
struct tcphdr
  {
    __extension__ union
    {
      struct
      {
	uint16_t th_sport;	/* source port */
	uint16_t th_dport;	/* destination port */
	tcp_seq th_seq;		/* sequence number */
	tcp_seq th_ack;		/* acknowledgement number */
# if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t th_x2:4;	/* (unused) */
	uint8_t th_off:4;	/* data offset */
# endif
# if __BYTE_ORDER == __BIG_ENDIAN
	uint8_t th_off:4;	/* data offset */
	uint8_t th_x2:4;	/* (unused) */
# endif
	uint8_t th_flags;
# define TH_FIN	0x01
# define TH_SYN	0x02
# define TH_RST	0x04
# define TH_PUSH	0x08
# define TH_ACK	0x10
# define TH_URG	0x20
	uint16_t th_win;	/* window */
	uint16_t th_sum;	/* checksum */
	uint16_t th_urp;	/* urgent pointer */
      };
      struct
      {
	uint16_t source;
	uint16_t dest;
	uint32_t seq;
	uint32_t ack_seq;
# if __BYTE_ORDER == __LITTLE_ENDIAN
	uint16_t res1:4;
	uint16_t doff:4;
	uint16_t fin:1;
	uint16_t syn:1;
	uint16_t rst:1;
	uint16_t psh:1;
	uint16_t ack:1;
	uint16_t urg:1;
	uint16_t res2:2;
# elif __BYTE_ORDER == __BIG_ENDIAN
	uint16_t doff:4;
	uint16_t res1:4;
	uint16_t res2:2;
	uint16_t urg:1;
	uint16_t ack:1;
	uint16_t psh:1;
	uint16_t rst:1;
	uint16_t syn:1;
	uint16_t fin:1;
# else
#  error "Adjust your <bits/endian.h> defines"
# endif
	uint16_t window;
	uint16_t check;
	uint16_t urg_ptr;
      };
    };
};

enum
{
  TCP_ESTABLISHED = 1,
  TCP_SYN_SENT,
  TCP_SYN_RECV,
  TCP_FIN_WAIT1,
  TCP_FIN_WAIT2,
  TCP_TIME_WAIT,
  TCP_CLOSE,
  TCP_CLOSE_WAIT,
  TCP_LAST_ACK,
  TCP_LISTEN,
  TCP_CLOSING   /* now a valid state */
};

# define TCPOPT_EOL		0
# define TCPOPT_NOP		1
# define TCPOPT_MAXSEG		2
# define TCPOLEN_MAXSEG		4
# define TCPOPT_WINDOW		3
# define TCPOLEN_WINDOW		3
# define TCPOPT_SACK_PERMITTED	4		/* Experimental */
# define TCPOLEN_SACK_PERMITTED	2
# define TCPOPT_SACK		5		/* Experimental */
# define TCPOPT_TIMESTAMP	8
# define TCPOLEN_TIMESTAMP	10
# define TCPOLEN_TSTAMP_APPA	(TCPOLEN_TIMESTAMP+2) /* appendix A */

# define TCPOPT_TSTAMP_HDR	\
    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)

/*
 * Default maximum segment size for TCP.
 * With an IP MSS of 576, this is 536,
 * but 512 is probably more convenient.
 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 */
# define TCP_MSS	512

# define TCP_MAXWIN	65535	/* largest value for (unscaled) window */

# define TCP_MAX_WINSHIFT	14	/* maximum window shift */

# define SOL_TCP		6	/* TCP level */


# define TCPI_OPT_TIMESTAMPS	1
# define TCPI_OPT_SACK		2
# define TCPI_OPT_WSCALE	4
# define TCPI_OPT_ECN		8

/* Values for tcpi_state.  */
enum tcp_ca_state
{
  TCP_CA_Open = 0,
  TCP_CA_Disorder = 1,
  TCP_CA_CWR = 2,
  TCP_CA_Recovery = 3,
  TCP_CA_Loss = 4
};

struct tcp_info
{
  u_int8_t	tcpi_state;
  u_int8_t	tcpi_ca_state;
  u_int8_t	tcpi_retransmits;
  u_int8_t	tcpi_probes;
  u_int8_t	tcpi_backoff;
  u_int8_t	tcpi_options;
  u_int8_t	tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;

  u_int32_t	tcpi_rto;
  u_int32_t	tcpi_ato;
  u_int32_t	tcpi_snd_mss;
  u_int32_t	tcpi_rcv_mss;

  u_int32_t	tcpi_unacked;
  u_int32_t	tcpi_sacked;
  u_int32_t	tcpi_lost;
  u_int32_t	tcpi_retrans;
  u_int32_t	tcpi_fackets;

  /* Times. */
  u_int32_t	tcpi_last_data_sent;
  u_int32_t	tcpi_last_ack_sent;	/* Not remembered, sorry.  */
  u_int32_t	tcpi_last_data_recv;
  u_int32_t	tcpi_last_ack_recv;

  /* Metrics. */
  u_int32_t	tcpi_pmtu;
  u_int32_t	tcpi_rcv_ssthresh;
  u_int32_t	tcpi_rtt;
  u_int32_t	tcpi_rttvar;
  u_int32_t	tcpi_snd_ssthresh;
  u_int32_t	tcpi_snd_cwnd;
  u_int32_t	tcpi_advmss;
  u_int32_t	tcpi_reordering;

  u_int32_t	tcpi_rcv_rtt;
  u_int32_t	tcpi_rcv_space;

  u_int32_t	tcpi_total_retrans;
};


/* For TCP_MD5SIG socket option.  */
#define TCP_MD5SIG_MAXKEYLEN	80

struct tcp_md5sig
{
  struct sockaddr_storage tcpm_addr;		/* Address associated.  */
  u_int16_t	__tcpm_pad1;			/* Zero.  */
  u_int16_t	tcpm_keylen;			/* Key length.  */
  u_int32_t	__tcpm_pad2;			/* Zero.  */
  u_int8_t	tcpm_key[TCP_MD5SIG_MAXKEYLEN];	/* Key (binary).  */
};

#endif /* Misc.  */

#endif /* netinet/tcp.h */
