genericopenlibs/cstdlib/LINCINET/TCP_FSM.H
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/* TCP_FSM.H
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 * 
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 * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved.
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 */
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/*
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 * Copyright (c) 1982, 1986 Regents of the University of California.
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 * All rights reserved.  The Berkeley software License Agreement
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 * specifies the terms and conditions for redistribution.
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 */
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/** @file
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@publishedAll
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@released
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*/
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/*
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 * TCP FSM state definitions.
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 * Per RFC793, September, 1981.
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 */
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#ifndef	_NETINET_TCP_FSM_H
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#define	_NETINET_TCP_FSM_H
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#ifdef	__cplusplus
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extern "C" {
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#endif
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#define	TCP_NSTATES	11
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#define	TCPS_CLOSED		0	/* closed */
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#define	TCPS_LISTEN		1	/* listening for connection */
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#define	TCPS_SYN_SENT		2	/* active, have sent syn */
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#define	TCPS_SYN_RECEIVED	3	/* have send and received syn */
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/** 
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states < TCPS_ESTABLISHED are those where connections not established 
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*/
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#define	TCPS_ESTABLISHED	4	/* established */
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#define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */
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/** 
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states > TCPS_CLOSE_WAIT are those where user has closed 
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*/
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#define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */
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#define	TCPS_CLOSING		7	/* closed xchd FIN; await FIN ACK */
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#define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */
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/** 
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states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN 
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*/
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#define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */
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#define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */
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#define	TCPS_HAVERCVDSYN(s)	((s) >= TCPS_SYN_RECEIVED)
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#define	TCPS_HAVERCVDFIN(s)	((s) >= TCPS_TIME_WAIT)
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#ifdef	TCPOUTFLAGS
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/**
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Flags used when sending segments in tcp_output.
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Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
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determined by state, with the proviso that TH_FIN is sent only
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if all data queued for output is included in the segment.
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*/
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const u_char	tcp_outflags[TCP_NSTATES] = {
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    TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
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    TH_ACK, TH_ACK,
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    TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
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};
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#endif
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#ifdef	TCPSTATES
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const char *tcpstates[] = {
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	"CLOSED",	"LISTEN",	"SYN_SENT",	"SYN_RCVD",
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	"ESTABLISHED",	"CLOSE_WAIT",	"FIN_WAIT_1",	"CLOSING",
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	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",
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};
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#endif
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#ifdef	__cplusplus
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}
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#endif
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#endif	/* _NETINET_TCP_FSM_H */