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

/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the TCP protocol.
 *
 * Version:     @(#)tcp.h       1.0.2   04/28/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_TCP_H
#define _LINUX_TCP_H

#include <linux/types.h>
#include <asm/byteorder.h>

struct tcphdr {
        __u16   source;
        __u16   dest;
        __u32   seq;
        __u32   ack_seq;
#if defined(__LITTLE_ENDIAN)
        __u16   res1:4,
                doff:4,
                fin:1,
                syn:1,
                rst:1,
                psh:1,
                ack:1,
                urg:1,
                ece:1,
                cwr:1;
#elif defined(__BIG_ENDIAN)
        __u16   doff:4,
                res1:4,
                cwr:1,
                ece:1,
                urg:1,
                ack:1,
                psh:1,
                rst:1,
                syn:1,
                fin:1;
#else
#error  "Endian problem - this didn't happen"
#endif  
        __u16   window;
        __u16   check;
        __u16   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 */

  TCP_MAX_STATES /* Leave at the end! */
};

#define TCP_STATE_MASK  0xF
#define TCP_ACTION_FIN  (1 << 7)

enum {
  TCPF_ESTABLISHED = (1 << 1),
  TCPF_SYN_SENT  = (1 << 2),
  TCPF_SYN_RECV  = (1 << 3),
  TCPF_FIN_WAIT1 = (1 << 4),
  TCPF_FIN_WAIT2 = (1 << 5),
  TCPF_TIME_WAIT = (1 << 6),
  TCPF_CLOSE     = (1 << 7),
  TCPF_CLOSE_WAIT = (1 << 8),
  TCPF_LAST_ACK  = (1 << 9),
  TCPF_LISTEN    = (1 << 10),
  TCPF_CLOSING   = (1 << 11) 
};

/*
 *      The union cast uses a gcc extension to avoid aliasing problems
 *  (union is compatible to any of its members)
 *  This means this part of the code is -fstrict-aliasing safe now.
 */
union tcp_word_hdr { 
        struct tcphdr hdr;
        __u32             words[5];
}; 

#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 

enum { 
        TCP_FLAG_CWR = __constant_htonl(0x00800000), 
        TCP_FLAG_ECE = __constant_htonl(0x00400000), 
        TCP_FLAG_URG = __constant_htonl(0x00200000), 
        TCP_FLAG_ACK = __constant_htonl(0x00100000), 
        TCP_FLAG_PSH = __constant_htonl(0x00080000), 
        TCP_FLAG_RST = __constant_htonl(0x00040000), 
        TCP_FLAG_SYN = __constant_htonl(0x00020000), 
        TCP_FLAG_FIN = __constant_htonl(0x00010000),
        TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
        TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
}; 

/* TCP socket options */
#define TCP_NODELAY             1       /* Turn off Nagle's algorithm. */
#define TCP_MAXSEG              2       /* Limit MSS */
#define TCP_CORK                3       /* Never send partially complete segments */
#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      /* Block/reenable quick acks */

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

enum tcp_ca_state
{
        TCP_CA_Open = 0,
#define TCPF_CA_Open    (1<<TCP_CA_Open)
        TCP_CA_Disorder = 1,
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
        TCP_CA_CWR = 2,
#define TCPF_CA_CWR     (1<<TCP_CA_CWR)
        TCP_CA_Recovery = 3,
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
        TCP_CA_Loss = 4
#define TCPF_CA_Loss    (1<<TCP_CA_Loss)
};

struct tcp_info
{
        __u8    tcpi_state;
        __u8    tcpi_ca_state;
        __u8    tcpi_retransmits;
        __u8    tcpi_probes;
        __u8    tcpi_backoff;
        __u8    tcpi_options;
        __u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;

        __u32   tcpi_rto;
        __u32   tcpi_ato;
        __u32   tcpi_snd_mss;
        __u32   tcpi_rcv_mss;

        __u32   tcpi_unacked;
        __u32   tcpi_sacked;
        __u32   tcpi_lost;
        __u32   tcpi_retrans;
        __u32   tcpi_fackets;

        /* Times. */
        __u32   tcpi_last_data_sent;
        __u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */
        __u32   tcpi_last_data_recv;
        __u32   tcpi_last_ack_recv;

        /* Metrics. */
        __u32   tcpi_pmtu;
        __u32   tcpi_rcv_ssthresh;
        __u32   tcpi_rtt;
        __u32   tcpi_rttvar;
        __u32   tcpi_snd_ssthresh;
        __u32   tcpi_snd_cwnd;
        __u32   tcpi_advmss;
        __u32   tcpi_reordering;

        __u32   tcpi_rcv_rtt;
        __u32   tcpi_rcv_space;

        __u32   tcpi_total_retrans;
};

#endif  /* _LINUX_TCP_H */