1 /*!\file netinet/tcp_fsm.h
2 * TCP Finite State Machine.
6 * Copyright (c) 1982, 1986, 1993
7 * The Regents of the University of California. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93
38 * $Id: tcp_fsm.h,v 1.7 1995/11/14 20:34:34 phk Exp $
41 #ifndef __NETINET_TCP_FSM_H
42 #define __NETINET_TCP_FSM_H
45 * TCP FSM state definitions.
46 * Per RFC793, September, 1981.
49 #define TCP_NSTATES 11
51 #define TCPS_CLOSED 0 /* closed */
52 #define TCPS_LISTEN 1 /* listening for connection */
53 #define TCPS_SYN_SENT 2 /* active, have sent syn */
54 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
55 /* states < TCPS_ESTABLISHED are those where connections not established */
56 #define TCPS_ESTABLISHED 4 /* established */
57 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
58 /* states > TCPS_CLOSE_WAIT are those where user has closed */
59 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
60 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
61 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
62 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
63 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
64 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
66 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
67 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
68 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
72 * Flags used when sending segments in tcp_output.
73 * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
74 * determined by state, with the proviso that TH_FIN is sent only
75 * if all data queued for output is included in the segment.
77 static u_char tcp_outflags[TCP_NSTATES] = {
78 TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
80 TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
85 int tcp_acounts[TCP_NSTATES][PRU_NREQ];
90 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
91 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
92 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",