1/* $NetBSD: tcp_fsm.h,v 1.16 2018/04/07 13:48:50 maxv 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 */
71const 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 TCPSTATES
87const char * const tcpstates[] = {
88 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
89 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
90 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
91};
92#elif defined(_KERNEL)
93extern const char * const tcpstates[];
94#endif
95
96#endif /* !_NETINET_TCP_FSM_H_ */
97