2.11BSD/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) 2/27/88
*/
/*
* 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)
*/
#define TCP_COMPAT_42 /* _always_ set for 2.11BSD - not worth the trouble
* of making it conditional
*/
#ifndef SB_MAX
#ifdef SB_MAXCOUNT
#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
#else
#define SB_MAX 8192 /* XXX */
#endif SB_MAXCOUNT
#endif SB_MAX
#ifndef IP_MAXPACKET
#define IP_MAXPACKET 65535L /* 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 ---------------- */
/*
* 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.
*/
#define tcps_connattempt tcps_ca
#define tcps_connects tcps_co
#define tcps_conndrops tcps_cd
#define tcps_keeptimeo tcps_kt
#define tcps_keepprobe tcps_kp
#define tcps_keepdrops tcps_kd
#define tcps_sndtotal tcps_st
#define tcps_sndpack tcps_sp
#define tcps_sndbyte tcps_sb
#define tcps_sndrexmitpack tcps_xp
#define tcps_sndrexmitbyte tcps_xb
#define tcps_sndacks tcps_sa
#define tcps_sndprobe tcps_SP
#define tcps_sndurg tcps_su
#define tcps_sndwinup tcps_sw
#define tcps_sndctrl tcps_sc
#define tcps_rcvtotal tcps_RT
#define tcps_rcvpack tcps_rp
#define tcps_rcvbyte tcps_rb
#define tcps_rcvbadsum tcps_bs
#define tcps_rcvbadoff tcps_bo
#define tcps_rcvshort tcps_rs
#define tcps_rcvduppack tcps_dp
#define tcps_rcvdupbyte tcps_db
#define tcps_rcvpartduppack tcps_DP
#define tcps_rcvpartdupbyte tcps_DB
#define tcps_rcvoopack tcps_op
#define tcps_rcvoobyte tcps_ob
#define tcps_rcvpackafterwin tcps_pw
#define tcps_rcvbyteafterwin tcps_bw
#define tcps_rcvafterclose tcps_ra
#define tcps_rcvwinprobe tcps_wp
#define tcps_rcvdupack tcps_da
#define tcps_rcvacktoomuch tcps_tm
#define tcps_rcvackpack tcps_ap
#define tcps_rcvackbyte tcps_ab
#define tcps_rcvwinupd tcps_wu
struct tcpstat {
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 */
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 */
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 SUPERVISOR
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