234 lines
9.6 KiB
C
234 lines
9.6 KiB
C
/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)tcp_var.h 7.8 (Berkeley) 6/29/88
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*/
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/*
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* TCP configuration: This is a half-assed attempt to make TCP
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* self-configure for a few varieties of 4.2 and 4.3-based unixes.
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* If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
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* this carefully (it's probably not right). Please send me mail
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* if you run into configuration problems.
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* - Van Jacobson (van@lbl-csam.arpa)
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*/
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#ifndef BSD
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#define BSD 42 /* if we're not 4.3, pretend we're 4.2 */
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#define OLDSTAT /* set if we have to use old netstat binaries */
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#endif
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/* #define OLDSTAT /* set if we have to use old netstat binaries */
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#if sun || BSD < 43
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#define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
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#endif
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#ifndef SB_MAX
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#ifdef SB_MAXCOUNT
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#define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
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#else
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#define SB_MAX 32767 /* XXX */
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#endif SB_MAXCOUNT
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#endif SB_MAX
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#ifndef IP_MAXPACKET
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#define IP_MAXPACKET 65535 /* maximum packet size */
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#endif
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/*
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* Bill Nowicki pointed out that the page size (CLBYTES) has
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* nothing to do with the mbuf cluster size. So, we followed
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* Sun's lead and made the new define MCLBYTES stand for the mbuf
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* cluster size. The following define makes up backwards compatible
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* with 4.3 and 4.2. If CLBYTES is >1024 on your machine, check
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* this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
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*/
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#ifndef MCLBYTES
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#define MCLBYTES CLBYTES /* XXX */
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#endif
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/*
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* The routine in_localaddr is broken in Sun's 3.4. We redefine ours
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* (in tcp_input.c) so we use can it but won't have a name conflict.
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*/
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#ifdef sun
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#define in_localaddr tcp_in_localaddr
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#endif
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/* --------------- end of TCP config ---------------- */
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/*
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* Kernel variables for tcp.
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*/
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/*
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* Tcp control block, one per tcp; fields:
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*/
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struct tcpcb {
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struct tcpiphdr *seg_next; /* sequencing queue */
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struct tcpiphdr *seg_prev;
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short t_state; /* state of this connection */
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short t_timer[TCPT_NTIMERS]; /* tcp timers */
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short t_rxtshift; /* log(2) of rexmt exp. backoff */
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short t_rxtcur; /* current retransmit value */
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short t_dupacks; /* consecutive dup acks recd */
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u_short t_maxseg; /* maximum segment size */
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char t_force; /* 1 if forcing out a byte */
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u_char t_flags;
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#define TF_ACKNOW 0x01 /* ack peer immediately */
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#define TF_DELACK 0x02 /* ack, but try to delay it */
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#define TF_NODELAY 0x04 /* don't delay packets to coalesce */
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#define TF_NOOPT 0x08 /* don't use tcp options */
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#define TF_SENTFIN 0x10 /* have sent FIN */
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struct tcpiphdr *t_template; /* skeletal packet for transmit */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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/*
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* The following fields are used as in the protocol specification.
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* See RFC783, Dec. 1981, page 21.
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*/
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/* send sequence variables */
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tcp_seq snd_una; /* send unacknowledged */
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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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tcp_seq snd_wl1; /* window update seg seq number */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq iss; /* initial send sequence number */
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u_short snd_wnd; /* send window */
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/* receive sequence variables */
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u_short rcv_wnd; /* receive window */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_up; /* receive urgent pointer */
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tcp_seq irs; /* initial receive sequence number */
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/*
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* Additional variables for this implementation.
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*/
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/* receive variables */
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tcp_seq rcv_adv; /* advertised window */
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/* retransmit variables */
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tcp_seq snd_max; /* highest sequence number sent
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* used to recognize retransmits
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*/
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/* congestion control (for slow start, source quench, retransmit after loss) */
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u_short snd_cwnd; /* congestion-controlled window */
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u_short snd_ssthresh; /* snd_cwnd size threshhold for
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* for slow start exponential to
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* linear switch */
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/*
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* transmit timing stuff.
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* srtt and rttvar are stored as fixed point; for convenience in smoothing,
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* srtt has 3 bits to the right of the binary point, rttvar has 2.
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* "Variance" is actually smoothed difference.
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*/
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short t_idle; /* inactivity time */
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short t_rtt; /* round trip time */
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tcp_seq t_rtseq; /* sequence number being timed */
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short t_srtt; /* smoothed round-trip time */
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short t_rttvar; /* variance in round-trip time */
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u_short max_rcvd; /* most peer has sent into window */
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u_short max_sndwnd; /* largest window peer has offered */
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/* out-of-band data */
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char t_oobflags; /* have some */
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char t_iobc; /* input character */
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#define TCPOOB_HAVEDATA 0x01
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#define TCPOOB_HADDATA 0x02
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};
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#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
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#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
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/*
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* TCP statistics.
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* Many of these should be kept per connection,
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* but that's inconvenient at the moment.
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*/
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struct tcpstat {
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#ifdef OLDSTAT
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/*
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* Declare statistics the same as in 4.3
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* at the start of tcpstat (same size and
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* position) for netstat.
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*/
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int tcps_rcvbadsum;
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int tcps_rcvbadoff;
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int tcps_rcvshort;
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int tcps_badsegs;
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int tcps_unack;
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#define tcps_badsum tcps_rcvbadsum
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#define tcps_badoff tcps_rcvbadoff
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#define tcps_hdrops tcps_rcvshort
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#endif OLDSTAT
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u_long tcps_connattempt; /* connections initiated */
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u_long tcps_accepts; /* connections accepted */
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u_long tcps_connects; /* connections established */
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u_long tcps_drops; /* connections dropped */
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u_long tcps_conndrops; /* embryonic connections dropped */
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u_long tcps_closed; /* conn. closed (includes drops) */
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u_long tcps_segstimed; /* segs where we tried to get rtt */
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u_long tcps_rttupdated; /* times we succeeded */
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u_long tcps_delack; /* delayed acks sent */
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u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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u_long tcps_rexmttimeo; /* retransmit timeouts */
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u_long tcps_persisttimeo; /* persist timeouts */
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u_long tcps_keeptimeo; /* keepalive timeouts */
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u_long tcps_keepprobe; /* keepalive probes sent */
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u_long tcps_keepdrops; /* connections dropped in keepalive */
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u_long tcps_sndtotal; /* total packets sent */
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u_long tcps_sndpack; /* data packets sent */
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u_long tcps_sndbyte; /* data bytes sent */
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u_long tcps_sndrexmitpack; /* data packets retransmitted */
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u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
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u_long tcps_sndacks; /* ack-only packets sent */
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u_long tcps_sndprobe; /* window probes sent */
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u_long tcps_sndurg; /* packets sent with URG only */
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u_long tcps_sndwinup; /* window update-only packets sent */
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u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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u_long tcps_rcvtotal; /* total packets received */
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u_long tcps_rcvpack; /* packets received in sequence */
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u_long tcps_rcvbyte; /* bytes received in sequence */
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#ifndef OLDSTAT
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u_long tcps_rcvbadsum; /* packets received with ccksum errs */
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u_long tcps_rcvbadoff; /* packets received with bad offset */
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u_long tcps_rcvshort; /* packets received too short */
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#endif
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u_long tcps_rcvduppack; /* duplicate-only packets received */
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u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
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u_long tcps_rcvpartduppack; /* packets with some duplicate data */
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u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
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u_long tcps_rcvoopack; /* out-of-order packets received */
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u_long tcps_rcvoobyte; /* out-of-order bytes received */
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u_long tcps_rcvpackafterwin; /* packets with data after window */
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u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
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u_long tcps_rcvafterclose; /* packets rcvd after "close" */
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u_long tcps_rcvwinprobe; /* rcvd window probe packets */
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u_long tcps_rcvdupack; /* rcvd duplicate acks */
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u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
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u_long tcps_rcvackpack; /* rcvd ack packets */
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u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
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u_long tcps_rcvwinupd; /* rcvd window update packets */
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};
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#ifdef _KERNEL
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struct inpcb tcb; /* head of queue of active tcpcb's */
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struct tcpstat tcpstat; /* tcp statistics */
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struct tcpiphdr *tcp_template();
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struct tcpcb *tcp_close(), *tcp_drop();
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struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
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#endif
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