FreeBSD/Linux Kernel Cross Reference
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: releng/5.0/sys/netinet/tcp_fsm.h 90137 2002-02-03 11:57:32Z markm $
35 */
36
37 #ifndef _NETINET_TCP_FSM_H_
38 #define _NETINET_TCP_FSM_H_
39
40 /*
41 * TCP FSM state definitions.
42 * Per RFC793, September, 1981.
43 */
44
45 #define TCP_NSTATES 11
46
47 #define TCPS_CLOSED 0 /* closed */
48 #define TCPS_LISTEN 1 /* listening for connection */
49 #define TCPS_SYN_SENT 2 /* active, have sent syn */
50 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
51 /* states < TCPS_ESTABLISHED are those where connections not established */
52 #define TCPS_ESTABLISHED 4 /* established */
53 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
54 /* states > TCPS_CLOSE_WAIT are those where user has closed */
55 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
56 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
57 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
58 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
59 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
60 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
61
62 /* for KAME src sync over BSD*'s */
63 #define TCP6_NSTATES TCP_NSTATES
64 #define TCP6S_CLOSED TCPS_CLOSED
65 #define TCP6S_LISTEN TCPS_LISTEN
66 #define TCP6S_SYN_SENT TCPS_SYN_SENT
67 #define TCP6S_SYN_RECEIVED TCPS_SYN_RECEIVED
68 #define TCP6S_ESTABLISHED TCPS_ESTABLISHED
69 #define TCP6S_CLOSE_WAIT TCPS_CLOSE_WAIT
70 #define TCP6S_FIN_WAIT_1 TCPS_FIN_WAIT_1
71 #define TCP6S_CLOSING TCPS_CLOSING
72 #define TCP6S_LAST_ACK TCPS_LAST_ACK
73 #define TCP6S_FIN_WAIT_2 TCPS_FIN_WAIT_2
74 #define TCP6S_TIME_WAIT TCPS_TIME_WAIT
75
76 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
77 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
78 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
79
80 #ifdef TCPOUTFLAGS
81 /*
82 * Flags used when sending segments in tcp_output.
83 * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
84 * determined by state, with the proviso that TH_FIN is sent only
85 * if all data queued for output is included in the segment.
86 */
87 static u_char tcp_outflags[TCP_NSTATES] = {
88 TH_RST|TH_ACK, /* 0, CLOSED */
89 0, /* 1, LISTEN */
90 TH_SYN, /* 2, SYN_SENT */
91 TH_SYN|TH_ACK, /* 3, SYN_RECEIVED */
92 TH_ACK, /* 4, ESTABLISHED */
93 TH_ACK, /* 5, CLOSE_WAIT */
94 TH_FIN|TH_ACK, /* 6, FIN_WAIT_1 */
95 TH_FIN|TH_ACK, /* 7, CLOSING */
96 TH_FIN|TH_ACK, /* 8, LAST_ACK */
97 TH_ACK, /* 9, FIN_WAIT_2 */
98 TH_ACK, /* 10, TIME_WAIT */
99 };
100 #endif
101
102 #ifdef KPROF
103 int tcp_acounts[TCP_NSTATES][PRU_NREQ];
104 #endif
105
106 #ifdef TCPSTATES
107 const char *tcpstates[] = {
108 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
109 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
110 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
111 };
112 #endif
113
114 #endif
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