/*

 * 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.  */

#ifdef __USE_MISC

# include <sys/types.h>

# ifdef __FAVOR_BSD

typedef	u_int32_t tcp_seq;

/*

 * TCP header.

 * Per RFC 793, September, 1981.

 */

struct tcphdr

  {

    u_int16_t th_sport;		/* source port */

    u_int16_t th_dport;		/* destination port */

    tcp_seq th_seq;		/* sequence number */

    tcp_seq th_ack;		/* acknowledgement number */

#  if __BYTE_ORDER == __LITTLE_ENDIAN

    u_int8_t th_x2:4;		/* (unused) */

    u_int8_t th_off:4;		/* data offset */

#  endif

#  if __BYTE_ORDER == __BIG_ENDIAN

    u_int8_t th_off:4;		/* data offset */

    u_int8_t th_x2:4;		/* (unused) */

#  endif

    u_int8_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

    u_int16_t th_win;		/* window */

    u_int16_t th_sum;		/* checksum */

    u_int16_t th_urp;		/* urgent pointer */

};

# else /* !__FAVOR_BSD */

struct tcphdr

  {

    u_int16_t source;

    u_int16_t dest;

    u_int32_t seq;

    u_int32_t ack_seq;

#  if __BYTE_ORDER == __LITTLE_ENDIAN

    u_int16_t res1:4;

    u_int16_t doff:4;

    u_int16_t fin:1;

    u_int16_t syn:1;

    u_int16_t rst:1;

    u_int16_t psh:1;

    u_int16_t ack:1;

    u_int16_t urg:1;

    u_int16_t res2:2;

#  elif __BYTE_ORDER == __BIG_ENDIAN

    u_int16_t doff:4;

    u_int16_t res1:4;

    u_int16_t res2:2;

    u_int16_t urg:1;

    u_int16_t ack:1;

    u_int16_t psh:1;

    u_int16_t rst:1;

    u_int16_t syn:1;

    u_int16_t fin:1;

#  else

#   error "Adjust your <bits/endian.h> defines"

#  endif

    u_int16_t window;

    u_int16_t check;

    u_int16_t urg_ptr;

};

# endif /* __FAVOR_BSD */

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

# define TCPI_OPT_ECN_SEEN	16

/* 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;

};

#endif /* Misc.  */

#endif /* netinet/tcp.h */