/*
* Copyright (c) 1997-1998 by Sun Microsystems, Inc.
* 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.
*/
/*
* Kernel variables for tcp.
*/
#ifndef _NETINET_TCP_VAR_H
#define _NETINET_TCP_VAR_H
#pragma ident "%Z%%M% %I% %E% SMI"
/* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87 */
#ifdef __cplusplus
extern "C" {
#endif
/*
* 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 */
ushort_t t_maxseg; /* maximum segment size */
char t_force; /* 1 if forcing out a byte */
uchar_t 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 */
ushort_t snd_wnd; /* send window */
/* receive sequence variables */
ushort_t 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) */
ushort_t snd_cwnd; /* congestion-controlled window */
ushort_t snd_ssthresh; /* snd_cwnd size threshhold for */
/* for slow start exponential to */
/*
* 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 */
ushort_t max_rcvd; /* most peer has sent into window */
ushort_t 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 {
uint_t tcps_connattempt; /* connections initiated */
uint_t tcps_accepts; /* connections accepted */
uint_t tcps_connects; /* connections established */
uint_t tcps_drops; /* connections dropped */
uint_t tcps_conndrops; /* embryonic connections dropped */
uint_t tcps_closed; /* conn. closed (includes drops) */
uint_t tcps_segstimed; /* segs where we tried to get rtt */
uint_t tcps_rttupdated; /* times we succeeded */
uint_t tcps_delack; /* delayed acks sent */
uint_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
uint_t tcps_rexmttimeo; /* retransmit timeouts */
uint_t tcps_persisttimeo; /* persist timeouts */
uint_t tcps_keeptimeo; /* keepalive timeouts */
uint_t tcps_keepprobe; /* keepalive probes sent */
uint_t tcps_keepdrops; /* connections dropped in keepalive */
uint_t tcps_sndtotal; /* total packets sent */
uint_t tcps_sndpack; /* data packets sent */
uint_t tcps_sndbyte; /* data bytes sent */
uint_t tcps_sndrexmitpack; /* data packets retransmitted */
uint_t tcps_sndrexmitbyte; /* data bytes retransmitted */
uint_t tcps_sndacks; /* ack-only packets sent */
uint_t tcps_sndprobe; /* window probes sent */
uint_t tcps_sndurg; /* packets sent with URG only */
uint_t tcps_sndwinup; /* window update-only packets sent */
uint_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
uint_t tcps_rcvtotal; /* total packets received */
uint_t tcps_rcvpack; /* packets received in sequence */
uint_t tcps_rcvbyte; /* bytes received in sequence */
uint_t tcps_rcvbadsum; /* packets received with ccksum errs */
uint_t tcps_rcvbadoff; /* packets received with bad offset */
uint_t tcps_rcvshort; /* packets received too short */
uint_t tcps_rcvduppack; /* duplicate-only packets received */
uint_t tcps_rcvdupbyte; /* duplicate-only bytes received */
uint_t tcps_rcvpartduppack; /* packets with some duplicate data */
uint_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
uint_t tcps_rcvoopack; /* out-of-order packets received */
uint_t tcps_rcvoobyte; /* out-of-order bytes received */
uint_t tcps_rcvpackafterwin; /* packets with data after window */
uint_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
uint_t tcps_rcvafterclose; /* packets rcvd after "close" */
uint_t tcps_rcvwinprobe; /* rcvd window probe packets */
uint_t tcps_rcvdupack; /* rcvd duplicate acks */
uint_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
uint_t tcps_rcvackpack; /* rcvd ack packets */
uint_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
uint_t tcps_rcvwinupd; /* rcvd window update packets */
};
#define TCP_COMPAT_42
#ifdef __cplusplus
}
#endif
#endif /* _NETINET_TCP_VAR_H */