include/netinet/tcp.h - maze/iproute2 - Git at Google

 /*
  * 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 */
	/*
	* 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 */