source: svn/trunk/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/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.  */

#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

/* 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;
};

#endif /* Misc.  */

#endif /* netinet/tcp.h */