tcpfsm.h

来自「TCP-IP红宝书源代码」· C头文件 代码 · 共 60 行

/* tcpfsm.h - TCB, EVENT, MKEVENT */

/* TCP states */

#define TCPS_FREE		0
#define TCPS_CLOSED		1
#define	TCPS_LISTEN		2
#define	TCPS_SYNSENT		3
#define	TCPS_SYNRCVD		4
#define	TCPS_ESTABLISHED	5
#define	TCPS_FINWAIT1		6
#define	TCPS_FINWAIT2		7
#define	TCPS_CLOSEWAIT		8
#define	TCPS_LASTACK		9
#define	TCPS_CLOSING		10
#define	TCPS_TIMEWAIT		11

#define	NTCPSTATES		12

/* Output States */

#define	TCPO_IDLE		0
#define	TCPO_PERSIST		1
#define	TCPO_XMIT		2
#define	TCPO_REXMT		3

#define	NTCPOSTATES		4

/* event processing */

#define	SEND		0x1
#define	PERSIST		0x2
#define	RETRANSMIT	0x3
#define	DELETE		0x4
#define	TMASK		0x7

#define	EVENT(x)	((int)(x) & TMASK)
#define	TCB(x)		((int)(x) >> 3)
#define	MKEVENT(timer, tcb)	(void *)(((tcb)<<3) | ((timer) & TMASK))

/* implementation parameters */

#define	TCP_MAXRETRIES	   12	/* max retransmissions before giving up */
#define	TCP_TWOMSL	12000	/* 2 minutes (2 * Max Segment Lifetime)	*/
#define	TCP_MAXRXT	 2000	/* 20 seconds max rexmt time		*/
#define	TCP_MINRXT	   50	/* 1/2 second min rexmt time		*/
#define	TCP_ACKDELAY	   20	/* 1/5 sec ACK delay, if TCBF_DELACK	*/

#define	TCP_MAXPRS	 6000	/* 1 minute max persist time		*/

/* second argument to tcpsend(): */

#define	TSF_NEWDATA	0	/* send all new data			*/
#define	TSF_REXMT	1	/* retransmit the first pending segment	*/

/* third argument to tcpwr():	*/

#define	TWF_NORMAL	0	/* normal data write			*/
#define	TWF_URGENT	1	/* urgent data write			*/