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  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)tcp_fsm.h   8.1 (Berkeley) 6/10/93
   31  * $FreeBSD: releng/8.2/sys/netinet/tcp_fsm.h 199583 2009-11-20 15:27:52Z jhb $
   32  */
   33 
   34 #ifndef _NETINET_TCP_FSM_H_
   35 #define _NETINET_TCP_FSM_H_
   36 
   37 /*
   38  * TCP FSM state definitions.
   39  *
   40  * Per RFC793, September, 1981.
   41  */
   42 
   43 #define TCP_NSTATES     11
   44 
   45 #define TCPS_CLOSED             0       /* closed */
   46 #define TCPS_LISTEN             1       /* listening for connection */
   47 #define TCPS_SYN_SENT           2       /* active, have sent syn */
   48 #define TCPS_SYN_RECEIVED       3       /* have sent and received syn */
   49 /* states < TCPS_ESTABLISHED are those where connections not established */
   50 #define TCPS_ESTABLISHED        4       /* established */
   51 #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
   52 /* states > TCPS_CLOSE_WAIT are those where user has closed */
   53 #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
   54 #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
   55 #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
   56 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
   57 #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
   58 #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
   59 
   60 /* for KAME src sync over BSD*'s */
   61 #define TCP6_NSTATES            TCP_NSTATES
   62 #define TCP6S_CLOSED            TCPS_CLOSED
   63 #define TCP6S_LISTEN            TCPS_LISTEN
   64 #define TCP6S_SYN_SENT          TCPS_SYN_SENT
   65 #define TCP6S_SYN_RECEIVED      TCPS_SYN_RECEIVED
   66 #define TCP6S_ESTABLISHED       TCPS_ESTABLISHED
   67 #define TCP6S_CLOSE_WAIT        TCPS_CLOSE_WAIT
   68 #define TCP6S_FIN_WAIT_1        TCPS_FIN_WAIT_1
   69 #define TCP6S_CLOSING           TCPS_CLOSING
   70 #define TCP6S_LAST_ACK          TCPS_LAST_ACK
   71 #define TCP6S_FIN_WAIT_2        TCPS_FIN_WAIT_2
   72 #define TCP6S_TIME_WAIT         TCPS_TIME_WAIT
   73 
   74 #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
   75 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
   76 #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
   77 
   78 #ifdef  TCPOUTFLAGS
   79 /*
   80  * Flags used when sending segments in tcp_output.  Basic flags (TH_RST,
   81  * TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso
   82  * that TH_FIN is sent only if all data queued for output is included in the
   83  * segment.
   84  */
   85 static u_char   tcp_outflags[TCP_NSTATES] = {
   86         TH_RST|TH_ACK,          /* 0, CLOSED */
   87         0,                      /* 1, LISTEN */
   88         TH_SYN,                 /* 2, SYN_SENT */
   89         TH_SYN|TH_ACK,          /* 3, SYN_RECEIVED */
   90         TH_ACK,                 /* 4, ESTABLISHED */
   91         TH_ACK,                 /* 5, CLOSE_WAIT */
   92         TH_FIN|TH_ACK,          /* 6, FIN_WAIT_1 */
   93         TH_FIN|TH_ACK,          /* 7, CLOSING */
   94         TH_FIN|TH_ACK,          /* 8, LAST_ACK */
   95         TH_ACK,                 /* 9, FIN_WAIT_2 */
   96         TH_ACK,                 /* 10, TIME_WAIT */
   97 };      
   98 #endif
   99 
  100 #ifdef KPROF
  101 int     tcp_acounts[TCP_NSTATES][PRU_NREQ];
  102 #endif
  103 
  104 #ifdef  TCPSTATES
  105 static char const * const tcpstates[] = {
  106         "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
  107         "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
  108         "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
  109 };
  110 #endif
  111 
  112 #endif

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