⟦b16db4c63⟧

TextFile

/*
 * 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.
 *
 *	@(#)tcp_var.h	2.3 - 90/01/11
 */

#ifndef _h_TCP_VAR 
#define _h_TCP_VAR 
#ident "@(#)tcp_var.h	2.4 - 90/11/02"

/*
 * Kernel variables for tcp.
 */

/*
 * Tcp control block, one per tcp; fields:
 */
struct tcpcb {
	mblk_t	*seg_next;	/* sequencing queue */
	mblk_t	*seg_prev;
	mblk_t  *t_mblk;	/* mblk for this pcb */
	short	t_state;		/* state of this connection */
	short	t_timer[TCPT_NTIMERS];	/* tcp timers */
	short	t_rxtshift;		/* log(2) of rexmt exp. backoff */
	short   t_rxtcur;		/*current retansmit value*/
	short   t_dupacks;		/*consecutive dup acks recd*/
	short	t_sflags;	/* flags for stream management */
#define TFS_DISCONN	0x01	/* disconnect has been requested */
#define TFS_CLOSED	0x02	/* the stream has been closed - release */
#define TFS_UBLOCKED	0x04	/* upstream has been flow controlled */
#define TFS_SCANNED	0x08	/* has been scanned in tcplrsrv */
#define TFS_DBLOCKED	0x10	/* upstream's write queue blocked */
#define TFS_ESTABLISH	0x20	/* in process of establishing connection */
	mblk_t *t_tcpopt;		/* tcp options */
	u_short	t_maxseg;		/* maximum segment size */
	char	t_force;		/* 1 if forcing out a byte */
	u_char	t_flags;
#define	TF_ACKNOW	0x01		/* ack peer immediately */
#define	TF_DELACK	0x02		/* ack, but try to delay it */
#define	TF_NODELAY	0x04		/* don't delay packets to coalesce */
#define	TF_NOOPT	0x08		/* don't use tcp options */
#define	TF_SENTFIN	0x10		/* have sent FIN */
#define TF_DRAIN	0x20
	mblk_t		 *t_template;	/* skeletal packet for transmit */
	struct	inpcb *t_inpcb;		/* back pointer to internet pcb */
/*
 * The following fields are used as in the protocol specification.
 * See RFC783, Dec. 1981, page 21.
 */
/* send sequence variables */
	tcp_seq	snd_una;		/* send unacknowledged */
	tcp_seq	snd_nxt;		/* send next */
	tcp_seq	snd_up;			/* send urgent pointer */
	tcp_seq	snd_wl1;		/* window update seg seq number */
	tcp_seq	snd_wl2;		/* window update seg ack number */
	tcp_seq	iss;			/* initial send sequence number */
	u_short	snd_wnd;		/* send window */
/* receive sequence variables */
	u_short	rcv_wnd;		/* receive window */
	tcp_seq	rcv_nxt;		/* receive next */
	tcp_seq	rcv_up;			/* receive urgent pointer */
	tcp_seq	irs;			/* initial receive sequence number */
/*
 * Additional variables for this implementation.
 */
/* receive variables */
	tcp_seq	rcv_adv;		/* advertised window */
/* retransmit variables */
	tcp_seq	snd_max;		/* highest sequence number sent
					 * used to recognize retransmits
					 */
/* congestion control (for source quench) */
	u_short	snd_cwnd;		/* congestion-controlled window */
	u_short	snd_ssthresh;		/* snd_cwnd size threshhold for
				         * slow start exponential to
					 * linear switch */
/* transmit timing stuff 
 * srtt snf rttvar are stored as fixed point; for convience in smoothing,
 * srtt has 3 bits to the right of the binary point, rttvar has 2.
 * "Variance" is actually smoothed difference.
 */
	short	t_idle;			/* inactivity time */
	short	t_rtt;			/* round trip time */
	u_short max_rcvd;		/* most peer has sent into window */
	tcp_seq	t_rtseq;		/* sequence number being timed */
#ifdef OLDHBTCP
	long	t_srtt;			/* smoothed round-trip time */
#else
	short	t_srtt;			/* smoothed round-trip time */
	short	t_rttvar;		/* variance in round trip time*/
#endif /*OLDHBTCP*/
	u_short	max_sndwnd;		/* largest window peer has offered */
/* out-of-band data */
	char	t_oobflags;		/* have some */
	char	t_iobc;			/* input character */
#define	TCPOOB_HAVEDATA	0x01
#define	TCPOOB_HADDATA	0x02
#define TCPOOB_RFCFORM  0x10	/* follow RFC961 interpretation */
#define TCPOOB_SEGMENT  0x20	/* try to get all data, not just last */
				/* this isn't entirely meaningful given */
				/* that only the "end" is provided */
};

#define	intotcpcb(ip)	((struct tcpcb *) ((mblk_t *)(ip)->inp_ppcb)->b_rptr)
#define	sototcpcb(so)	(intotcpcb(sotoinpcb(so)))

#ifndef IP_MAXPACKET
#define IP_MAXPACKET	65535
#endif
struct	tcpstat {
#ifdef OLDSTAT
	int	tcps_badsum;
	int	tcps_badoff;
	int	tcps_hdrops;
	int	tcps_badsegs;
	int	tcps_unack;
#else
/* 
 * The first three stats are accomodated by the new stat, but the last two are
 * not. However, they are never used anyway.
 */
	int	tcps_connattempt;	/* connections initiated */
	int	tcps_accepts;		/* connections accepted */
	int	tcps_connects;		/* connections established */
	int	tcps_drops;		/* connections dropped */
	int	tcps_conndrops;		/* embryonic connections dropped */
	int	tcps_closed;		/* conn. closed (includes drops) */
	int	tcps_segstimed;		/* segs where we tried to get rtt */
	int	tcps_rttupdated;	/* times we succeeded */
	int	tcps_delack;		/* delayed acks sent */
	int	tcps_timeoutdrop;	/* conn. dropped in rxmt timeout */
	int	tcps_rexmttimeo;	/* retransmit timeouts */
	int	tcps_persisttimeo;	/* persist timeouts */
	int	tcps_keeptimeo;		/* keepalive timeouts */
	int	tcps_keepprobe;		/* keepalive probes sent */
	int	tcps_keepdrops;		/* connections dropped in keepalive */

	int	tcps_sndtotal;		/* total packets sent */
	int	tcps_sndpack;		/* data packets sent */
	int	tcps_sndbyte;		/* data bytes sent */
	int	tcps_sndrexmitpack;	/* data packets retransmitted */
	int	tcps_sndrexmitbyte;	/* data bytes retransmitted */
	int	tcps_sndacks;		/* ack-only packets sent */
	int	tcps_sndprobe;		/* window probes sent */
	int	tcps_sndurg;		/* packets sent with URG only */
	int	tcps_sndwinup;		/* window update-only packets sent */
	int	tcps_sndctrl;		/* control (SYN|FIN|RST) packets sent */

	int	tcps_rcvtotal;		/* total packets received */
	int	tcps_rcvpack;		/* packets received in sequence */
	int	tcps_rcvbyte;		/* bytes received in sequence */
	int	tcps_rcvbadsum;		/* packets received with ccksum errs */
	int	tcps_rcvbadoff;		/* packets received with bad offset */
	int	tcps_rcvshort;		/* packets received too short */
	int	tcps_rcvduppack;	/* duplicate-only packets received */
	int	tcps_rcvdupbyte;	/* duplicate-only bytes received */
	int	tcps_rcvpartduppack;	/* packets with some duplicate data */
	int	tcps_rcvpartdupbyte;	/* dup. bytes in part-dup. packets */
	int	tcps_rcvoopack;		/* out-of-order packets received */
	int	tcps_rcvoobyte;		/* out-of-order bytes received */
	int	tcps_rcvpackafterwin;	/* packets with data after window */
	int	tcps_rcvbyteafterwin;	/* bytes rcvd after window */
	int	tcps_rcvafterclose;	/* packets rcvd after "close" */
	int	tcps_rcvwinprobe;	/* rcvd window probe packets */
	int	tcps_rcvdupack;		/* rcvd duplicate acks */
	int	tcps_rcvacktoomuch;	/* rcvd acks for unsent data */
	int	tcps_rcvackpack;	/* rcvd ack packets */
	int	tcps_rcvackbyte;	/* bytes acked by rcvd acks */
	int	tcps_rcvwinupd;		/* rcvd window update packets */

#define tcps_badsum     tcps_rcvbadsum
#define tcps_badoff     tcps_rcvbadoff
#define tcps_hdrops     tcps_rcvshort

#endif	/* OLDSTAT */

};

#ifdef KERNEL
extern struct	inpcb tcb;		/* head of queue of active tcpcb's */
extern struct	tcpstat tcpstat;	/* tcp statistics */
extern mblk_t  *tcp_template();
extern struct	tcpcb *tcp_close(), *tcp_drop();
extern struct	tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
#endif
#endif /* _h_TCP_VAR  */
DataMuseum.dk

Regnecentalen RC-900

⟦b16db4c63⟧ TextFile

Derivation

TextFile
