FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_fsm.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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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_fsm.h   8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NETINET_TCP_FSM_H_
    #define _NETINET_TCP_FSM_H_
    
    /*
     * TCP FSM state definitions.
     * Per RFC793, September, 1981.
     */
    
    #define TCP_NSTATES     11
    
    #define TCPS_CLOSED             0       /* closed */
    #define TCPS_LISTEN             1       /* listening for connection */
    #define TCPS_SYN_SENT           2       /* active, have sent syn */
    #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
    /* states < TCPS_ESTABLISHED are those where connections not established */
    #define TCPS_ESTABLISHED        4       /* established */
    #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
    /* states > TCPS_CLOSE_WAIT are those where user has closed */
    #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
    #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
    #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
    /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
    #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
    #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
    
    #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
    #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
    #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
    
    #ifdef  TCPOUTFLAGS
    /*
     * Flags used when sending segments in tcp_output.
     * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
     * determined by state, with the proviso that TH_FIN is sent only
     * if all data queued for output is included in the segment.
     */
    static u_char   tcp_outflags[TCP_NSTATES] = {
            TH_RST|TH_ACK,          /* 0, CLOSED */
            0,                      /* 1, LISTEN */
            TH_SYN,                 /* 2, SYN_SENT */
            TH_SYN|TH_ACK,          /* 3, SYN_RECEIVED */
            TH_ACK,                 /* 4, ESTABLISHED */
            TH_ACK,                 /* 5, CLOSE_WAIT */
            TH_FIN|TH_ACK,          /* 6, FIN_WAIT_1 */
            TH_FIN|TH_ACK,          /* 7, CLOSING */
            TH_FIN|TH_ACK,          /* 8, LAST_ACK */
            TH_ACK,                 /* 9, FIN_WAIT_2 */
            TH_ACK,                 /* 10, TIME_WAIT */
    };      
    #endif
    
    #ifdef KPROF
    int     tcp_acounts[TCP_NSTATES][PRU_NREQ];
    #endif
    
    #ifdef  TCPSTATES
    char *tcpstates[] = {
            "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
            "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
            "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
    };
    #endif
    
   #endif

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