sys/netinet/tcp_fsm.h

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