[unix-history] / usr / src / sys / netinet / tcp_var.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 *	@(#)tcp_var.h	7.7 (Berkeley) %G%
 */

/*
 * TCP configuration:  This is a half-assed attempt to make TCP
 * self-configure for a few varieties of 4.2 and 4.3-based unixes.
 * If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
 * this carefully (it's probably not right).  Please send me mail
 * if you run into configuration problems.
 *  - Van Jacobson (van@lbl-csam.arpa)
 */

#ifndef BSD
#define BSD 42	/* if we're not 4.3, pretend we're 4.2 */
#define OLDSTAT	/* set if we have to use old netstat binaries */
#endif

/* #define OLDSTAT	/* set if we have to use old netstat binaries */

#if sun || BSD < 43
#define TCP_COMPAT_42	/* set if we have to interop w/4.2 systems */
#endif

#ifndef SB_MAX
#ifdef	SB_MAXCOUNT
#define	SB_MAX	SB_MAXCOUNT	/* Sun has to be a little bit different... */
#else
#define SB_MAX	32767		/* XXX */
#endif	SB_MAXCOUNT
#endif	SB_MAX

#ifndef IP_MAXPACKET
#define	IP_MAXPACKET	65535		/* maximum packet size */
#endif

/*
 * Bill Nowicki pointed out that the page size (CLBYTES) has
 * nothing to do with the mbuf cluster size.  So, we followed
 * Sun's lead and made the new define MCLBYTES stand for the mbuf
 * cluster size.  The following define makes up backwards compatible
 * with 4.3 and 4.2.  If CLBYTES is >1024 on your machine, check
 * this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
 */
#ifndef MCLBYTES
#define	MCLBYTES CLBYTES	/* XXX */
#endif

/*
 * The routine in_localaddr is broken in Sun's 3.4.  We redefine ours
 * (in tcp_input.c) so we use can it but won't have a name conflict.
 */
#ifdef sun
#define in_localaddr tcp_in_localaddr
#endif

/* --------------- end of TCP config ---------------- */

/*
 * TCP configuration:  This is a half-assed attempt to make TCP
 * self-configure for a few varieties of 4.2 and 4.3-based unixes.
 * If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
 * this carefully (it's probably not right).  Please send me mail
 * if you run into configuration problems.
 *  - Van Jacobson (van@lbl-csam.arpa)
 */

#ifndef BSD
#define BSD 42	/* if we're not 4.3, pretend we're 4.2 */
#define OLDSTAT	/* set if we have to use old netstat binaries */
#endif

/* #define OLDSTAT	/* set if we have to use old netstat binaries */

#if sun || BSD < 43
#define TCP_COMPAT_42	/* set if we have to interop w/4.2 systems */
#endif

#ifndef SB_MAX
#ifdef	SB_MAXCOUNT
#define	SB_MAX	SB_MAXCOUNT	/* Sun has to be a little bit different... */
#else
#define SB_MAX	32767		/* XXX */
#endif	SB_MAXCOUNT
#endif	SB_MAX

/*
 * Bill Nowicki pointed out that the page size (CLBYTES) has
 * nothing to do with the mbuf cluster size.  So, we followed
 * Sun's lead and made the new define MCLBYTES stand for the mbuf
 * cluster size.  The following define makes up backwards compatible
 * with 4.3 and 4.2.  If CLBYTES is >1024 on your machine, check
 * this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
 */
#ifndef MCLBYTES
#define	MCLBYTES CLBYTES	/* XXX */
#endif

/*
 * The routine in_localaddr is broken in Sun's 3.4.  We redefine ours
 * (in tcp_input.c) so we use can it but won't have a name conflict.
 */
#ifdef sun
#define in_localaddr tcp_in_localaddr
#endif

/* --------------- end of TCP config ---------------- */

/*
 * Kernel variables for tcp.
 */

/*
 * Tcp control block, one per tcp; fields:
 */
struct tcpcb {
	struct	tcpiphdr *seg_next;	/* sequencing queue */
	struct	tcpiphdr *seg_prev;
	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 retransmit value */
	short	t_dupacks;		/* consecutive dup acks recd */
	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 */
	struct	tcpiphdr *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 slow start, source quench, retransmit after loss) */
	u_short	snd_cwnd;		/* congestion-controlled window */
	u_short snd_ssthresh;		/* snd_cwnd size threshhold for
					 * for slow start exponential to
					 * linear switch */
/*
 * transmit timing stuff.
 * srtt and rttvar are stored as fixed point; for convenience 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 */
	tcp_seq	t_rtseq;		/* sequence number being timed */
	short	t_srtt;			/* smoothed round-trip time */
	short	t_rttvar;		/* variance in round-trip time */
	u_short max_rcvd;		/* most peer has sent into window */
	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	intotcpcb(ip)	((struct tcpcb *)(ip)->inp_ppcb)
#define	sototcpcb(so)	(intotcpcb(sotoinpcb(so)))

/*
 * TCP statistics.
 * Many of these should be kept per connection,
 * but that's inconvenient at the moment.
 */
struct	tcpstat {
#ifdef OLDSTAT
	/*
	 * Declare statistics the same as in 4.3
	 * at the start of tcpstat (same size and
	 * position) for netstat.
	 */
	int	tcps_rcvbadsum;
	int	tcps_rcvbadoff;
	int	tcps_rcvshort;
	int	tcps_badsegs;
	int	tcps_unack;
#define	tcps_badsum	tcps_rcvbadsum
#define	tcps_badoff	tcps_rcvbadoff
#define	tcps_hdrops	tcps_rcvshort

#endif OLDSTAT
#ifdef OLDSTAT
	/*
	 * Declare statistics the same as in 4.3
	 * at the start of tcpstat (same size and
	 * position) for netstat.
	 */
	int	tcps_rcvbadsum;
	int	tcps_rcvbadoff;
	int	tcps_rcvshort;
	int	tcps_badsegs;
	int	tcps_unack;
#define	tcps_badsum	tcps_rcvbadsum
#define	tcps_badoff	tcps_rcvbadoff
#define	tcps_hdrops	tcps_rcvshort

#endif OLDSTAT
	u_long	tcps_connattempt;	/* connections initiated */
	u_long	tcps_accepts;		/* connections accepted */
	u_long	tcps_connects;		/* connections established */
	u_long	tcps_drops;		/* connections dropped */
	u_long	tcps_conndrops;		/* embryonic connections dropped */
	u_long	tcps_closed;		/* conn. closed (includes drops) */
	u_long	tcps_segstimed;		/* segs where we tried to get rtt */
	u_long	tcps_rttupdated;	/* times we succeeded */
	u_long	tcps_delack;		/* delayed acks sent */
	u_long	tcps_timeoutdrop;	/* conn. dropped in rxmt timeout */
	u_long	tcps_rexmttimeo;	/* retransmit timeouts */
	u_long	tcps_persisttimeo;	/* persist timeouts */
	u_long	tcps_keeptimeo;		/* keepalive timeouts */
	u_long	tcps_keepprobe;		/* keepalive probes sent */
	u_long	tcps_keepdrops;		/* connections dropped in keepalive */

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

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

#ifdef KERNEL
struct	inpcb tcb;		/* head of queue of active tcpcb's */
struct	tcpstat tcpstat;	/* tcp statistics */
struct	tcpiphdr *tcp_template();
struct	tcpcb *tcp_close(), *tcp_drop();
struct	tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
#endif
Commit	Line	Data
8ae0e4b4	1	/*
0880b18e	2	* Copyright (c) 1982, 1986 Regents of the University of California.
2b6b6284	3	* All rights reserved.
8ae0e4b4	4	*
2b6b6284 KB	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that this notice is preserved and that due credit is given
	7	* to the University of California at Berkeley. The name of the University
	8	* may not be used to endorse or promote products derived from this
	9	* software without specific prior written permission. This software
	10	* is provided ``as is'' without express or implied warranty.
	11	*
914527c0	12	* @(#)tcp_var.h 7.7 (Berkeley) %G%
8ae0e4b4	13	*/
ad6d0022	14
9d866d2f MK	15	/*
	16	* TCP configuration: This is a half-assed attempt to make TCP
	17	* self-configure for a few varieties of 4.2 and 4.3-based unixes.
	18	* If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
	19	* this carefully (it's probably not right). Please send me mail
	20	* if you run into configuration problems.
	21	* - Van Jacobson (van@lbl-csam.arpa)
	22	*/
	23
	24	#ifndef BSD
	25	#define BSD 42 /* if we're not 4.3, pretend we're 4.2 */
ac4e7106	26	#define OLDSTAT /* set if we have to use old netstat binaries */
9d866d2f MK	27	#endif
9d866d2f MK	28
ac4e7106 MK	29	/* #define OLDSTAT /* set if we have to use old netstat binaries */
ac4e7106 MK	30
9d866d2f MK	31	#if sun \|\| BSD < 43
	32	#define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
	33	#endif
	34
	35	#ifndef SB_MAX
	36	#ifdef SB_MAXCOUNT
	37	#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
	38	#else
	39	#define SB_MAX 32767 /* XXX */
	40	#endif SB_MAXCOUNT
	41	#endif SB_MAX
	42
914527c0 MK	43	#ifndef IP_MAXPACKET
	44	#define IP_MAXPACKET 65535 /* maximum packet size */
	45	#endif
	46
	47	/*
	48	* Bill Nowicki pointed out that the page size (CLBYTES) has
	49	* nothing to do with the mbuf cluster size. So, we followed
	50	* Sun's lead and made the new define MCLBYTES stand for the mbuf
	51	* cluster size. The following define makes up backwards compatible
	52	* with 4.3 and 4.2. If CLBYTES is >1024 on your machine, check
	53	* this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
	54	*/
	55	#ifndef MCLBYTES
	56	#define MCLBYTES CLBYTES /* XXX */
	57	#endif
	58
	59	/*
	60	* The routine in_localaddr is broken in Sun's 3.4. We redefine ours
	61	* (in tcp_input.c) so we use can it but won't have a name conflict.
	62	*/
	63	#ifdef sun
	64	#define in_localaddr tcp_in_localaddr
	65	#endif
	66
	67	/* --------------- end of TCP config ---------------- */
	68
	69	/*
	70	* TCP configuration: This is a half-assed attempt to make TCP
	71	* self-configure for a few varieties of 4.2 and 4.3-based unixes.
	72	* If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
	73	* this carefully (it's probably not right). Please send me mail
	74	* if you run into configuration problems.
	75	* - Van Jacobson (van@lbl-csam.arpa)
	76	*/
	77
	78	#ifndef BSD
	79	#define BSD 42 /* if we're not 4.3, pretend we're 4.2 */
	80	#define OLDSTAT /* set if we have to use old netstat binaries */
	81	#endif
	82
	83	/* #define OLDSTAT /* set if we have to use old netstat binaries */
	84
	85	#if sun \|\| BSD < 43
	86	#define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
	87	#endif
	88
	89	#ifndef SB_MAX
	90	#ifdef SB_MAXCOUNT
	91	#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
	92	#else
	93	#define SB_MAX 32767 /* XXX */
	94	#endif SB_MAXCOUNT
	95	#endif SB_MAX
	96
9d866d2f MK	97	/*
	98	* Bill Nowicki pointed out that the page size (CLBYTES) has
	99	* nothing to do with the mbuf cluster size. So, we followed
	100	* Sun's lead and made the new define MCLBYTES stand for the mbuf
	101	* cluster size. The following define makes up backwards compatible
	102	* with 4.3 and 4.2. If CLBYTES is >1024 on your machine, check
	103	* this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
	104	*/
	105	#ifndef MCLBYTES
	106	#define MCLBYTES CLBYTES /* XXX */
	107	#endif
	108
	109	/*
	110	* The routine in_localaddr is broken in Sun's 3.4. We redefine ours
	111	* (in tcp_input.c) so we use can it but won't have a name conflict.
	112	*/
	113	#ifdef sun
	114	#define in_localaddr tcp_in_localaddr
	115	#endif
	116
	117	/* --------------- end of TCP config ---------------- */
	118
ad6d0022 BJ	119	/*
	120	* Kernel variables for tcp.
	121	*/
	122
	123	/*
405c9168	124	* Tcp control block, one per tcp; fields:
ad6d0022	125	*/
53a5409e	126	struct tcpcb {
a6503abf BJ	127	struct tcpiphdr seg_next; / sequencing queue */
a6503abf BJ	128	struct tcpiphdr *seg_prev;
4aed14e3	129	short t_state; /* state of this connection */
a41e26c7	130	short t_timer[TCPT_NTIMERS]; /* tcp timers */
405c9168	131	short t_rxtshift; /* log(2) of rexmt exp. backoff */
a6bbda13	132	short t_rxtcur; /* current retransmit value */
e1ead9e7	133	short t_dupacks; /* consecutive dup acks recd */
faa26a98	134	u_short t_maxseg; /* maximum segment size */
4aed14e3	135	char t_force; /* 1 if forcing out a byte */
2ff61f9d	136	u_char t_flags;
6f638424 MK	137	#define TF_ACKNOW 0x01 /* ack peer immediately */
	138	#define TF_DELACK 0x02 /* ack, but try to delay it */
	139	#define TF_NODELAY 0x04 /* don't delay packets to coalesce */
	140	#define TF_NOOPT 0x08 /* don't use tcp options */
faa26a98	141	#define TF_SENTFIN 0x10 /* have sent FIN */
2ff61f9d BJ	142	struct tcpiphdr t_template; / skeletal packet for transmit */
2ff61f9d BJ	143	struct inpcb t_inpcb; / back pointer to internet pcb */
ad6d0022	144	/*
2ff61f9d BJ	145	* The following fields are used as in the protocol specification.
2ff61f9d BJ	146	* See RFC783, Dec. 1981, page 21.
ad6d0022	147	*/
2ff61f9d BJ	148	/* send sequence variables */
	149	tcp_seq snd_una; /* send unacknowledged */
	150	tcp_seq snd_nxt; /* send next */
2ff61f9d BJ	151	tcp_seq snd_up; /* send urgent pointer */
	152	tcp_seq snd_wl1; /* window update seg seq number */
	153	tcp_seq snd_wl2; /* window update seg ack number */
	154	tcp_seq iss; /* initial send sequence number */
4aed14e3	155	u_short snd_wnd; /* send window */
2ff61f9d	156	/* receive sequence variables */
6f638424	157	u_short rcv_wnd; /* receive window */
4aed14e3	158	tcp_seq rcv_nxt; /* receive next */
2ff61f9d BJ	159	tcp_seq rcv_up; /* receive urgent pointer */
2ff61f9d BJ	160	tcp_seq irs; /* initial receive sequence number */
ad6d0022	161	/*
2ff61f9d	162	* Additional variables for this implementation.
ad6d0022	163	*/
2ff61f9d	164	/* receive variables */
a6503abf BJ	165	tcp_seq rcv_adv; /* advertised window */
a6503abf BJ	166	/* retransmit variables */
a41e26c7	167	tcp_seq snd_max; /* highest sequence number sent
05586739 MK	168	* used to recognize retransmits
05586739 MK	169	*/
e1ead9e7	170	/* congestion control (for slow start, source quench, retransmit after loss) */
05586739	171	u_short snd_cwnd; /* congestion-controlled window */
e1ead9e7 MK	172	u_short snd_ssthresh; /* snd_cwnd size threshhold for
	173	* for slow start exponential to
	174	* linear switch */
7cc62c26 MK	175	/*
	176	* transmit timing stuff.
	177	* srtt and rttvar are stored as fixed point; for convenience in smoothing,
	178	* srtt has 3 bits to the right of the binary point, rttvar has 2.
e1ead9e7	179	* "Variance" is actually smoothed difference.
7cc62c26	180	*/
405c9168 BJ	181	short t_idle; /* inactivity time */
	182	short t_rtt; /* round trip time */
	183	tcp_seq t_rtseq; /* sequence number being timed */
7cc62c26 MK	184	short t_srtt; /* smoothed round-trip time */
7cc62c26 MK	185	short t_rttvar; /* variance in round-trip time */
e1ead9e7	186	u_short max_rcvd; /* most peer has sent into window */
18a438b6	187	u_short max_sndwnd; /* largest window peer has offered */
8b5a83bb BJ	188	/* out-of-band data */
8b5a83bb BJ	189	char t_oobflags; /* have some */
b2db9217	190	char t_iobc; /* input character */
8b5a83bb	191	#define TCPOOB_HAVEDATA 0x01
22b0776e	192	#define TCPOOB_HADDATA 0x02
2ff61f9d	193	};
ad6d0022	194
2ff61f9d BJ	195	#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
2ff61f9d BJ	196	#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
ad6d0022	197
3b52afc5 MK	198	/*
	199	* TCP statistics.
	200	* Many of these should be kept per connection,
	201	* but that's inconvenient at the moment.
	202	*/
2b4b57cd	203	struct tcpstat {
ac4e7106 MK	204	#ifdef OLDSTAT
	205	/*
	206	* Declare statistics the same as in 4.3
	207	* at the start of tcpstat (same size and
	208	* position) for netstat.
	209	*/
	210	int tcps_rcvbadsum;
	211	int tcps_rcvbadoff;
	212	int tcps_rcvshort;
	213	int tcps_badsegs;
	214	int tcps_unack;
	215	#define tcps_badsum tcps_rcvbadsum
	216	#define tcps_badoff tcps_rcvbadoff
	217	#define tcps_hdrops tcps_rcvshort
	218
914527c0 MK	219	#endif OLDSTAT
	220	#ifdef OLDSTAT
	221	/*
	222	* Declare statistics the same as in 4.3
	223	* at the start of tcpstat (same size and
	224	* position) for netstat.
	225	*/
	226	int tcps_rcvbadsum;
	227	int tcps_rcvbadoff;
	228	int tcps_rcvshort;
	229	int tcps_badsegs;
	230	int tcps_unack;
	231	#define tcps_badsum tcps_rcvbadsum
	232	#define tcps_badoff tcps_rcvbadoff
	233	#define tcps_hdrops tcps_rcvshort
	234
ac4e7106	235	#endif OLDSTAT
3b52afc5 MK	236	u_long tcps_connattempt; /* connections initiated */
	237	u_long tcps_accepts; /* connections accepted */
	238	u_long tcps_connects; /* connections established */
	239	u_long tcps_drops; /* connections dropped */
	240	u_long tcps_conndrops; /* embryonic connections dropped */
	241	u_long tcps_closed; /* conn. closed (includes drops) */
	242	u_long tcps_segstimed; /* segs where we tried to get rtt */
	243	u_long tcps_rttupdated; /* times we succeeded */
	244	u_long tcps_delack; /* delayed acks sent */
	245	u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
	246	u_long tcps_rexmttimeo; /* retransmit timeouts */
	247	u_long tcps_persisttimeo; /* persist timeouts */
	248	u_long tcps_keeptimeo; /* keepalive timeouts */
	249	u_long tcps_keepprobe; /* keepalive probes sent */
	250	u_long tcps_keepdrops; /* connections dropped in keepalive */
	251
	252	u_long tcps_sndtotal; /* total packets sent */
	253	u_long tcps_sndpack; /* data packets sent */
	254	u_long tcps_sndbyte; /* data bytes sent */
	255	u_long tcps_sndrexmitpack; /* data packets retransmitted */
	256	u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
	257	u_long tcps_sndacks; /* ack-only packets sent */
	258	u_long tcps_sndprobe; /* window probes sent */
	259	u_long tcps_sndurg; /* packets sent with URG only */
	260	u_long tcps_sndwinup; /* window update-only packets sent */
	261	u_long tcps_sndctrl; /* control (SYN\|FIN\|RST) packets sent */
	262
	263	u_long tcps_rcvtotal; /* total packets received */
	264	u_long tcps_rcvpack; /* packets received in sequence */
	265	u_long tcps_rcvbyte; /* bytes received in sequence */
914527c0	266	#ifndef OLDSTAT
ac4e7106	267	#ifndef OLDSTAT
3b52afc5 MK	268	u_long tcps_rcvbadsum; /* packets received with ccksum errs */
	269	u_long tcps_rcvbadoff; /* packets received with bad offset */
	270	u_long tcps_rcvshort; /* packets received too short */
914527c0	271	#endif
ac4e7106	272	#endif
3b52afc5 MK	273	u_long tcps_rcvduppack; /* duplicate-only packets received */
	274	u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
	275	u_long tcps_rcvpartduppack; /* packets with some duplicate data */
	276	u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
	277	u_long tcps_rcvoopack; /* out-of-order packets received */
	278	u_long tcps_rcvoobyte; /* out-of-order bytes received */
	279	u_long tcps_rcvpackafterwin; /* packets with data after window */
	280	u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
	281	u_long tcps_rcvafterclose; /* packets rcvd after "close" */
	282	u_long tcps_rcvwinprobe; /* rcvd window probe packets */
	283	u_long tcps_rcvdupack; /* rcvd duplicate acks */
	284	u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
	285	u_long tcps_rcvackpack; /* rcvd ack packets */
	286	u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
	287	u_long tcps_rcvwinupd; /* rcvd window update packets */
2b4b57cd BJ	288	};
2b4b57cd BJ	289
ad6d0022	290	#ifdef KERNEL
2ff61f9d BJ	291	struct inpcb tcb; /* head of queue of active tcpcb's */
2ff61f9d BJ	292	struct tcpstat tcpstat; /* tcp statistics */
53a5409e	293	struct tcpiphdr *tcp_template();
0e3936fa SL	294	struct tcpcb tcp_close(), tcp_drop();
0e3936fa SL	295	struct tcpcb tcp_timers(), tcp_disconnect(), *tcp_usrclosed();
ad6d0022	296	#endif