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

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    1 /*      $NetBSD: tcp_fsm.h,v 1.15 2005/12/10 23:36:23 elad Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tcp_fsm.h   8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 #ifndef _NETINET_TCP_FSM_H_
   35 #define _NETINET_TCP_FSM_H_
   36 
   37 /*
   38  * TCP FSM state definitions.
   39  * Per RFC793, September, 1981.
   40  */
   41 
   42 #define TCP_NSTATES     11
   43 
   44 #define TCPS_CLOSED             0       /* closed */
   45 #define TCPS_LISTEN             1       /* listening for connection */
   46 #define TCPS_SYN_SENT           2       /* active, have sent syn */
   47 #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
   48 /* states < TCPS_ESTABLISHED are those where connections not established */
   49 #define TCPS_ESTABLISHED        4       /* established */
   50 #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
   51 /* states > TCPS_CLOSE_WAIT are those where user has closed */
   52 #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
   53 #define TCPS_CLOSING            7       /* closed xchd FIN; await ACK */
   54 #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
   55 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
   56 #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
   57 #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
   58 
   59 #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
   60 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
   61 #define TCPS_HAVERCVDFIN(s) \
   62     ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2))
   63 
   64 #ifdef  TCPOUTFLAGS
   65 /*
   66  * Flags used when sending segments in tcp_output.
   67  * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
   68  * determined by state, with the proviso that TH_FIN is sent only
   69  * if all data queued for output is included in the segment.
   70  */
   71 const u_char    tcp_outflags[TCP_NSTATES] = {
   72         TH_RST|TH_ACK,  /* CLOSED */
   73         0,              /* LISTEN */
   74         TH_SYN,         /* SYN_SENT */
   75         TH_SYN|TH_ACK,  /* SYN_RCVD */
   76         TH_ACK,         /* ESTABLISHED */
   77         TH_ACK,         /* CLOSE_WAIT */
   78         TH_FIN|TH_ACK,  /* FIN_WAIT_1 */
   79         TH_FIN|TH_ACK,  /* CLOSING */
   80         TH_FIN|TH_ACK,  /* LAST_ACK */
   81         TH_ACK,         /* FIN_WAIT_2 */
   82         TH_ACK,         /* TIME_WAIT */
   83 };
   84 #endif
   85 
   86 #ifdef KPROF
   87 int     tcp_acounts[TCP_NSTATES][PRU_NREQ];
   88 #endif
   89 
   90 #ifdef  TCPSTATES
   91 const char * const tcpstates[] = {
   92         "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
   93         "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
   94         "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
   95 };
   96 #elif defined(_KERNEL)
   97 extern const char * const tcpstates[];
   98 #endif
   99 
  100 #endif /* !_NETINET_TCP_FSM_H_ */

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