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      1 /*
      2  * Copyright (c) 1997-1998 by Sun Microsystems, Inc.
      3  * All rights reserved.
      4  */
      5 
      6 /*
      7  * Copyright (c) 1982, 1986 Regents of the University of California.
      8  * All rights reserved.  The Berkeley software License Agreement
      9  * specifies the terms and conditions for redistribution.
     10  */
     11 
     12 /*
     13  * Kernel variables for tcp.
     14  */
     15 
     16 #ifndef	_NETINET_TCP_VAR_H
     17 #define	_NETINET_TCP_VAR_H
     18 
     19 #pragma ident	"@(#)tcp_var.h	1.4	98/01/06 SMI"
     20 /* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87	*/
     21 
     22 #ifdef	__cplusplus
     23 extern "C" {
     24 #endif
     25 
     26 /*
     27  * Tcp control block, one per tcp; fields:
     28  */
     29 struct tcpcb {
     30 	struct	tcpiphdr *seg_next;	/* sequencing queue */
     31 	struct	tcpiphdr *seg_prev;
     32 	short	t_state;		/* state of this connection */
     33 	short	t_timer[TCPT_NTIMERS];	/* tcp timers */
     34 	short	t_rxtshift;		/* log(2) of rexmt exp. backoff */
     35 	short	t_rxtcur;		/* current retransmit value */
     36 	short	t_dupacks;		/* consecutive dup acks recd */
     37 	ushort_t t_maxseg;		/* maximum segment size */
     38 	char	t_force;		/* 1 if forcing out a byte */
     39 	uchar_t	t_flags;
     40 #define	TF_ACKNOW	0x01		/* ack peer immediately */
     41 #define	TF_DELACK	0x02		/* ack, but try to delay it */
     42 #define	TF_NODELAY	0x04		/* don't delay packets to coalesce */
     43 #define	TF_NOOPT	0x08		/* don't use tcp options */
     44 #define	TF_SENTFIN	0x10		/* have sent FIN */
     45 	struct	tcpiphdr *t_template;	/* skeletal packet for transmit */
     46 	struct	inpcb *t_inpcb;		/* back pointer to internet pcb */
     47 /*
     48  * The following fields are used as in the protocol specification.
     49  * See RFC783, Dec. 1981, page 21.
     50  */
     51 /* send sequence variables */
     52 	tcp_seq	snd_una;		/* send unacknowledged */
     53 	tcp_seq	snd_nxt;		/* send next */
     54 	tcp_seq	snd_up;			/* send urgent pointer */
     55 	tcp_seq	snd_wl1;		/* window update seg seq number */
     56 	tcp_seq	snd_wl2;		/* window update seg ack number */
     57 	tcp_seq	iss;			/* initial send sequence number */
     58 	ushort_t snd_wnd;		/* send window */
     59 /* receive sequence variables */
     60 	ushort_t rcv_wnd;		/* receive window */
     61 	tcp_seq	rcv_nxt;		/* receive next */
     62 	tcp_seq	rcv_up;			/* receive urgent pointer */
     63 	tcp_seq	irs;			/* initial receive sequence number */
     64 /*
     65  * Additional variables for this implementation.
     66  */
     67 /* receive variables */
     68 	tcp_seq	rcv_adv;		/* advertised window */
     69 /* retransmit variables */
     70 	tcp_seq	snd_max;		/* highest sequence number sent */
     71 					/* used to recognize retransmits */
     72 
     73 /* congestion control (for slow start, source quench, retransmit after loss) */
     74 	ushort_t snd_cwnd;		/* congestion-controlled window */
     75 	ushort_t snd_ssthresh;		/* snd_cwnd size threshhold for */
     76 					/* for slow start exponential to */
     77 /*
     78  * transmit timing stuff.
     79  * srtt and rttvar are stored as fixed point; for convenience in smoothing,
     80  * srtt has 3 bits to the right of the binary point, rttvar has 2.
     81  * "Variance" is actually smoothed difference.
     82  */
     83 	short	t_idle;			/* inactivity time */
     84 	short	t_rtt;			/* round trip time */
     85 	tcp_seq	t_rtseq;		/* sequence number being timed */
     86 	short	t_srtt;			/* smoothed round-trip time */
     87 	short	t_rttvar;		/* variance in round-trip time */
     88 	ushort_t max_rcvd;		/* most peer has sent into window */
     89 	ushort_t max_sndwnd;		/* largest window peer has offered */
     90 /* out-of-band data */
     91 	char	t_oobflags;		/* have some */
     92 	char	t_iobc;			/* input character */
     93 #define	TCPOOB_HAVEDATA	0x01
     94 #define	TCPOOB_HADDATA	0x02
     95 };
     96 
     97 #define	intotcpcb(ip)	((struct tcpcb *)(ip)->inp_ppcb)
     98 #define	sototcpcb(so)	(intotcpcb(sotoinpcb(so)))
     99 
    100 /*
    101  * TCP statistics.
    102  * Many of these should be kept per connection,
    103  * but that's inconvenient at the moment.
    104  */
    105 struct	tcpstat {
    106 	uint_t	tcps_connattempt;	/* connections initiated */
    107 	uint_t	tcps_accepts;		/* connections accepted */
    108 	uint_t	tcps_connects;		/* connections established */
    109 	uint_t	tcps_drops;		/* connections dropped */
    110 	uint_t	tcps_conndrops;		/* embryonic connections dropped */
    111 	uint_t	tcps_closed;		/* conn. closed (includes drops) */
    112 	uint_t	tcps_segstimed;		/* segs where we tried to get rtt */
    113 	uint_t	tcps_rttupdated;	/* times we succeeded */
    114 	uint_t	tcps_delack;		/* delayed acks sent */
    115 	uint_t	tcps_timeoutdrop;	/* conn. dropped in rxmt timeout */
    116 	uint_t	tcps_rexmttimeo;	/* retransmit timeouts */
    117 	uint_t	tcps_persisttimeo;	/* persist timeouts */
    118 	uint_t	tcps_keeptimeo;		/* keepalive timeouts */
    119 	uint_t	tcps_keepprobe;		/* keepalive probes sent */
    120 	uint_t	tcps_keepdrops;		/* connections dropped in keepalive */
    121 
    122 	uint_t	tcps_sndtotal;		/* total packets sent */
    123 	uint_t	tcps_sndpack;		/* data packets sent */
    124 	uint_t	tcps_sndbyte;		/* data bytes sent */
    125 	uint_t	tcps_sndrexmitpack;	/* data packets retransmitted */
    126 	uint_t	tcps_sndrexmitbyte;	/* data bytes retransmitted */
    127 	uint_t	tcps_sndacks;		/* ack-only packets sent */
    128 	uint_t	tcps_sndprobe;		/* window probes sent */
    129 	uint_t	tcps_sndurg;		/* packets sent with URG only */
    130 	uint_t	tcps_sndwinup;		/* window update-only packets sent */
    131 	uint_t	tcps_sndctrl;		/* control (SYN|FIN|RST) packets sent */
    132 
    133 	uint_t	tcps_rcvtotal;		/* total packets received */
    134 	uint_t	tcps_rcvpack;		/* packets received in sequence */
    135 	uint_t	tcps_rcvbyte;		/* bytes received in sequence */
    136 	uint_t	tcps_rcvbadsum;		/* packets received with ccksum errs */
    137 	uint_t	tcps_rcvbadoff;		/* packets received with bad offset */
    138 	uint_t	tcps_rcvshort;		/* packets received too short */
    139 	uint_t	tcps_rcvduppack;	/* duplicate-only packets received */
    140 	uint_t	tcps_rcvdupbyte;	/* duplicate-only bytes received */
    141 	uint_t	tcps_rcvpartduppack;	/* packets with some duplicate data */
    142 	uint_t	tcps_rcvpartdupbyte;	/* dup. bytes in part-dup. packets */
    143 	uint_t	tcps_rcvoopack;		/* out-of-order packets received */
    144 	uint_t	tcps_rcvoobyte;		/* out-of-order bytes received */
    145 	uint_t	tcps_rcvpackafterwin;	/* packets with data after window */
    146 	uint_t	tcps_rcvbyteafterwin;	/* bytes rcvd after window */
    147 	uint_t	tcps_rcvafterclose;	/* packets rcvd after "close" */
    148 	uint_t	tcps_rcvwinprobe;	/* rcvd window probe packets */
    149 	uint_t	tcps_rcvdupack;		/* rcvd duplicate acks */
    150 	uint_t	tcps_rcvacktoomuch;	/* rcvd acks for unsent data */
    151 	uint_t	tcps_rcvackpack;	/* rcvd ack packets */
    152 	uint_t	tcps_rcvackbyte;	/* bytes acked by rcvd acks */
    153 	uint_t	tcps_rcvwinupd;		/* rcvd window update packets */
    154 };
    155 
    156 #define	TCP_COMPAT_42
    157 
    158 #ifdef	__cplusplus
    159 }
    160 #endif
    161 
    162 #endif	/* _NETINET_TCP_VAR_H */
    163