3 * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).
8 * Copyright (c) 1982, 1986 Regents of the University of California.
9 * All rights reserved. The Berkeley software License Agreement
10 * specifies the terms and conditions for redistribution.
19 * TCP FSM state definitions.
20 * Per RFC793, September, 1981.
23 #ifndef _NETINET_TCP_FSM_H
24 #define _NETINET_TCP_FSM_H
30 #define TCP_NSTATES 11
32 #define TCPS_CLOSED 0 /* closed */
33 #define TCPS_LISTEN 1 /* listening for connection */
34 #define TCPS_SYN_SENT 2 /* active, have sent syn */
35 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
37 states < TCPS_ESTABLISHED are those where connections not established
39 #define TCPS_ESTABLISHED 4 /* established */
40 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
43 states > TCPS_CLOSE_WAIT are those where user has closed
45 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
46 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
47 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
50 states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN
52 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
53 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
55 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
56 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
60 Flags used when sending segments in tcp_output.
61 Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
62 determined by state, with the proviso that TH_FIN is sent only
63 if all data queued for output is included in the segment.
65 const u_char tcp_outflags[TCP_NSTATES] = {
66 TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
68 TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
74 const char *tcpstates[] = {
75 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
76 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
77 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
85 #endif /* _NETINET_TCP_FSM_H */