/* TCP_FSM.H

  * 

  * Portions copyright (c) 1997-1999 Symbian Ltd.  All rights reserved.

  */

 /*

  * Copyright (c) 1982, 1986 Regents of the University of California.

  * All rights reserved.  The Berkeley software License Agreement

  * specifies the terms and conditions for redistribution.

  */

 /** @file

 @publishedAll

 @released

 */

 /*

  * TCP FSM state definitions.

  * Per RFC793, September, 1981.

  */

 #ifndef	_NETINET_TCP_FSM_H

 #define	_NETINET_TCP_FSM_H

 #ifdef	__cplusplus

 extern "C" {

 #endif

 #define	TCP_NSTATES	11

 #define	TCPS_CLOSED		0	/* closed */

 #define	TCPS_LISTEN		1	/* listening for connection */

 #define	TCPS_SYN_SENT		2	/* active, have sent syn */

 #define	TCPS_SYN_RECEIVED	3	/* have send and received syn */

 /** 

 states < TCPS_ESTABLISHED are those where connections not established 

 */

 #define	TCPS_ESTABLISHED	4	/* established */

 #define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */

 /** 

 states > TCPS_CLOSE_WAIT are those where user has closed 

 */

 #define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */

 #define	TCPS_CLOSING		7	/* closed xchd FIN; await FIN ACK */

 #define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */

 /** 

 states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN 

 */

 #define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */

 #define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */

 #define	TCPS_HAVERCVDSYN(s)	((s) >= TCPS_SYN_RECEIVED)

 #define	TCPS_HAVERCVDFIN(s)	((s) >= TCPS_TIME_WAIT)

 #ifdef	TCPOUTFLAGS

 /**

 Flags used when sending segments in tcp_output.

 Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally

 determined by state, with the proviso that TH_FIN is sent only

 if all data queued for output is included in the segment.

 */

 const u_char	tcp_outflags[TCP_NSTATES] = {

     TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,

     TH_ACK, TH_ACK,

     TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,

 };

 #endif

 #ifdef	TCPSTATES

 const char *tcpstates[] = {

 	"CLOSED",	"LISTEN",	"SYN_SENT",	"SYN_RCVD",

 	"ESTABLISHED",	"CLOSE_WAIT",	"FIN_WAIT_1",	"CLOSING",

 	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",

 };

 #endif

 #ifdef	__cplusplus

 }

 #endif

 #endif	/* _NETINET_TCP_FSM_H */