The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)tcp_fsm.h   8.1 (Berkeley) 6/10/93
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _NETINET_TCP_FSM_H_
   37 #define _NETINET_TCP_FSM_H_
   38 
   39 /*
   40  * TCP FSM state definitions.
   41  *
   42  * Per RFC793, September, 1981.
   43  */
   44 
   45 #define TCP_NSTATES     11
   46 
   47 #define TCPS_CLOSED             0       /* closed */
   48 #define TCPS_LISTEN             1       /* listening for connection */
   49 #define TCPS_SYN_SENT           2       /* active, have sent syn */
   50 #define TCPS_SYN_RECEIVED       3       /* have sent and received syn */
   51 /* states < TCPS_ESTABLISHED are those where connections not established */
   52 #define TCPS_ESTABLISHED        4       /* established */
   53 #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
   54 /* states > TCPS_CLOSE_WAIT are those where user has closed */
   55 #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
   56 #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
   57 #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
   58 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
   59 #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
   60 #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
   61 
   62 #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
   63 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
   64 #define TCPS_HAVERCVDFIN(s)     \
   65     ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2))
   66 
   67 #ifdef  TCPOUTFLAGS
   68 /*
   69  * Flags used when sending segments in tcp_output.  Basic flags (TH_RST,
   70  * TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso
   71  * that TH_FIN is sent only if all data queued for output is included in the
   72  * segment.
   73  */
   74 static u_char   tcp_outflags[TCP_NSTATES] = {
   75         TH_RST|TH_ACK,          /* 0, CLOSED */
   76         0,                      /* 1, LISTEN */
   77         TH_SYN,                 /* 2, SYN_SENT */
   78         TH_SYN|TH_ACK,          /* 3, SYN_RECEIVED */
   79         TH_ACK,                 /* 4, ESTABLISHED */
   80         TH_ACK,                 /* 5, CLOSE_WAIT */
   81         TH_FIN|TH_ACK,          /* 6, FIN_WAIT_1 */
   82         TH_FIN|TH_ACK,          /* 7, CLOSING */
   83         TH_FIN|TH_ACK,          /* 8, LAST_ACK */
   84         TH_ACK,                 /* 9, FIN_WAIT_2 */
   85         TH_ACK,                 /* 10, TIME_WAIT */
   86 };
   87 #endif
   88 
   89 #ifdef  TCPSTATES
   90 static char const * const tcpstates[] = {
   91         "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
   92         "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
   93         "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
   94 };
   95 #endif
   96 
   97 #endif

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