FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_fsm.h

     /*      $OpenBSD: tcp_fsm.h,v 1.9 2018/02/05 14:53:26 bluhm Exp $       */
     /*      $NetBSD: tcp_fsm.h,v 1.6 1994/10/14 16:01:48 mycroft Exp $      */
     
     /*
      * 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. 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
     */
    
    #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 sent 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 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.
     */
    u_char  tcp_outflags[TCP_NSTATES] = {
        TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
        TH_ACK, TH_ACK,
        TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
    };
    #endif /* TCPOUTFLAGS */
    
    #ifdef  TCPSTATES
    const char *tcpstates[] = {
            "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
            "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
            "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
    };
    #endif /* TCPSTATES */
    #endif /* _NETINET_TCP_FSM_H_ */

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