* Copyright (c) 1982, 1986 Regents of the University of California.
* 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)
#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 */
/* #define OLDSTAT /* set if we have to use old netstat binaries */
#define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
#define SB_MAX 32767 /* XXX */
#define IP_MAXPACKET 65535 /* maximum packet size */
* 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.
#define MCLBYTES CLBYTES /* XXX */
* 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.
#define in_localaddr tcp_in_localaddr
/* --------------- 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)
#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 */
/* #define OLDSTAT /* set if we have to use old netstat binaries */
#define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
#define SB_MAX 32767 /* XXX */
* 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.
#define MCLBYTES CLBYTES /* XXX */
* 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.
#define in_localaddr tcp_in_localaddr
/* --------------- end of TCP config ---------------- */
* Kernel variables for tcp.
* Tcp control block, one per tcp; fields:
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 */
#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.
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
* 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 */ 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)))
* Many of these should be kept per connection,
* but that's inconvenient at the moment.
* Declare statistics the same as in 4.3
* at the start of tcpstat (same size and
#define tcps_badsum tcps_rcvbadsum
#define tcps_badoff tcps_rcvbadoff
#define tcps_hdrops tcps_rcvshort
* Declare statistics the same as in 4.3
* at the start of tcpstat (same size and
#define tcps_badsum tcps_rcvbadsum
#define tcps_badoff tcps_rcvbadoff
#define tcps_hdrops tcps_rcvshort
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 */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();
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