LXR iproute2/include/netinet/tcp.h

   1/*
   2 * Copyright (c) 1982, 1986, 1993
   3 *      The Regents of the University of California.  All rights reserved.
   4 *
   5 * Redistribution and use in source and binary forms, with or without
   6 * modification, are permitted provided that the following conditions
   7 * are met:
   8 * 1. Redistributions of source code must retain the above copyright
   9 *    notice, this list of conditions and the following disclaimer.
  10 * 2. Redistributions in binary form must reproduce the above copyright
  11 *    notice, this list of conditions and the following disclaimer in the
  12 *    documentation and/or other materials provided with the distribution.
  13 * 4. Neither the name of the University nor the names of its contributors
  14 *    may be used to endorse or promote products derived from this software
  15 *    without specific prior written permission.
  16 *
  17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27 * SUCH DAMAGE.
  28 *
  29 *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  30 */
  31
  32#ifndef _NETINET_TCP_H
  33#define _NETINET_TCP_H  1
  34
  35#include <features.h>
  36
  37/*
  38 * User-settable options (used with setsockopt).
  39 */
  40#define TCP_NODELAY      1      /* Don't delay send to coalesce packets  */
  41#define TCP_MAXSEG       2      /* Set maximum segment size  */
  42#define TCP_CORK         3      /* Control sending of partial frames  */
  43#define TCP_KEEPIDLE     4      /* Start keeplives after this period */
  44#define TCP_KEEPINTVL    5      /* Interval between keepalives */
  45#define TCP_KEEPCNT      6      /* Number of keepalives before death */
  46#define TCP_SYNCNT       7      /* Number of SYN retransmits */
  47#define TCP_LINGER2      8      /* Life time of orphaned FIN-WAIT-2 state */
  48#define TCP_DEFER_ACCEPT 9      /* Wake up listener only when data arrive */
  49#define TCP_WINDOW_CLAMP 10     /* Bound advertised window */
  50#define TCP_INFO         11     /* Information about this connection. */
  51#define TCP_QUICKACK     12     /* Bock/reenable quick ACKs.  */
  52#define TCP_CONGESTION   13     /* Congestion control algorithm.  */
  53
  54#ifdef __USE_MISC
  55# include <sys/types.h>
  56
  57# ifdef __FAVOR_BSD
  58typedef u_int32_t tcp_seq;
  59/*
  60 * TCP header.
  61 * Per RFC 793, September, 1981.
  62 */
  63struct tcphdr
  64  {
  65    u_int16_t th_sport;         /* source port */
  66    u_int16_t th_dport;         /* destination port */
  67    tcp_seq th_seq;             /* sequence number */
  68    tcp_seq th_ack;             /* acknowledgement number */
  69#  if __BYTE_ORDER == __LITTLE_ENDIAN
  70    u_int8_t th_x2:4;           /* (unused) */
  71    u_int8_t th_off:4;          /* data offset */
  72#  endif
  73#  if __BYTE_ORDER == __BIG_ENDIAN
  74    u_int8_t th_off:4;          /* data offset */
  75    u_int8_t th_x2:4;           /* (unused) */
  76#  endif
  77    u_int8_t th_flags;
  78#  define TH_FIN        0x01
  79#  define TH_SYN        0x02
  80#  define TH_RST        0x04
  81#  define TH_PUSH       0x08
  82#  define TH_ACK        0x10
  83#  define TH_URG        0x20
  84    u_int16_t th_win;           /* window */
  85    u_int16_t th_sum;           /* checksum */
  86    u_int16_t th_urp;           /* urgent pointer */
  87};
  88
  89# else /* !__FAVOR_BSD */
  90struct tcphdr
  91  {
  92    u_int16_t source;
  93    u_int16_t dest;
  94    u_int32_t seq;
  95    u_int32_t ack_seq;
  96#  if __BYTE_ORDER == __LITTLE_ENDIAN
  97    u_int16_t res1:4;
  98    u_int16_t doff:4;
  99    u_int16_t fin:1;
 100    u_int16_t syn:1;
 101    u_int16_t rst:1;
 102    u_int16_t psh:1;
 103    u_int16_t ack:1;
 104    u_int16_t urg:1;
 105    u_int16_t res2:2;
 106#  elif __BYTE_ORDER == __BIG_ENDIAN
 107    u_int16_t doff:4;
 108    u_int16_t res1:4;
 109    u_int16_t res2:2;
 110    u_int16_t urg:1;
 111    u_int16_t ack:1;
 112    u_int16_t psh:1;
 113    u_int16_t rst:1;
 114    u_int16_t syn:1;
 115    u_int16_t fin:1;
 116#  else
 117#   error "Adjust your <bits/endian.h> defines"
 118#  endif
 119    u_int16_t window;
 120    u_int16_t check;
 121    u_int16_t urg_ptr;
 122};
 123# endif /* __FAVOR_BSD */
 124
 125enum
 126{
 127  TCP_ESTABLISHED = 1,
 128  TCP_SYN_SENT,
 129  TCP_SYN_RECV,
 130  TCP_FIN_WAIT1,
 131  TCP_FIN_WAIT2,
 132  TCP_TIME_WAIT,
 133  TCP_CLOSE,
 134  TCP_CLOSE_WAIT,
 135  TCP_LAST_ACK,
 136  TCP_LISTEN,
 137  TCP_CLOSING   /* now a valid state */
 138};
 139
 140# define TCPOPT_EOL             0
 141# define TCPOPT_NOP             1
 142# define TCPOPT_MAXSEG          2
 143# define TCPOLEN_MAXSEG         4
 144# define TCPOPT_WINDOW          3
 145# define TCPOLEN_WINDOW         3
 146# define TCPOPT_SACK_PERMITTED  4               /* Experimental */
 147# define TCPOLEN_SACK_PERMITTED 2
 148# define TCPOPT_SACK            5               /* Experimental */
 149# define TCPOPT_TIMESTAMP       8
 150# define TCPOLEN_TIMESTAMP      10
 151# define TCPOLEN_TSTAMP_APPA    (TCPOLEN_TIMESTAMP+2) /* appendix A */
 152
 153# define TCPOPT_TSTAMP_HDR      \
 154    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 155
 156/*
 157 * Default maximum segment size for TCP.
 158 * With an IP MSS of 576, this is 536,
 159 * but 512 is probably more convenient.
 160 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 161 */
 162# define TCP_MSS        512
 163
 164# define TCP_MAXWIN     65535   /* largest value for (unscaled) window */
 165
 166# define TCP_MAX_WINSHIFT       14      /* maximum window shift */
 167
 168# define SOL_TCP                6       /* TCP level */
 169
 170
 171# define TCPI_OPT_TIMESTAMPS    1
 172# define TCPI_OPT_SACK          2
 173# define TCPI_OPT_WSCALE        4
 174# define TCPI_OPT_ECN           8
 175# define TCPI_OPT_ECN_SEEN      16
 176
 177/* Values for tcpi_state.  */
 178enum tcp_ca_state
 179{
 180  TCP_CA_Open = 0,
 181  TCP_CA_Disorder = 1,
 182  TCP_CA_CWR = 2,
 183  TCP_CA_Recovery = 3,
 184  TCP_CA_Loss = 4
 185};
 186
 187struct tcp_info
 188{
 189  u_int8_t      tcpi_state;
 190  u_int8_t      tcpi_ca_state;
 191  u_int8_t      tcpi_retransmits;
 192  u_int8_t      tcpi_probes;
 193  u_int8_t      tcpi_backoff;
 194  u_int8_t      tcpi_options;
 195  u_int8_t      tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
 196
 197  u_int32_t     tcpi_rto;
 198  u_int32_t     tcpi_ato;
 199  u_int32_t     tcpi_snd_mss;
 200  u_int32_t     tcpi_rcv_mss;
 201
 202  u_int32_t     tcpi_unacked;
 203  u_int32_t     tcpi_sacked;
 204  u_int32_t     tcpi_lost;
 205  u_int32_t     tcpi_retrans;
 206  u_int32_t     tcpi_fackets;
 207
 208  /* Times. */
 209  u_int32_t     tcpi_last_data_sent;
 210  u_int32_t     tcpi_last_ack_sent;     /* Not remembered, sorry.  */
 211  u_int32_t     tcpi_last_data_recv;
 212  u_int32_t     tcpi_last_ack_recv;
 213
 214  /* Metrics. */
 215  u_int32_t     tcpi_pmtu;
 216  u_int32_t     tcpi_rcv_ssthresh;
 217  u_int32_t     tcpi_rtt;
 218  u_int32_t     tcpi_rttvar;
 219  u_int32_t     tcpi_snd_ssthresh;
 220  u_int32_t     tcpi_snd_cwnd;
 221  u_int32_t     tcpi_advmss;
 222  u_int32_t     tcpi_reordering;
 223  u_int32_t     tcpi_rcv_rtt;
 224  u_int32_t     tcpi_rcv_space;
 225  u_int32_t     tcpi_total_retrans;
 226
 227};
 228
 229#endif /* Misc.  */
 230
 231#endif /* netinet/tcp.h */
 232