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- /*
- * 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
- */
-
- #ifndef _TCP_VAR
- #define _TCP_VAR
-
- /*
- * 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)
- */
-
- #ifndef BSD
- #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 */
- #endif
-
- /* #define OLDSTAT /* set if we have to use old netstat binaries */
-
- #if sun || BSD < 43
- #define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
- #endif
-
- #ifndef SB_MAX
- #ifdef SB_MAXCOUNT
- #define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
- #else
- #define SB_MAX 32767 /* XXX */
- #endif SB_MAXCOUNT
- #endif SB_MAX
-
- #ifndef IP_MAXPACKET
- #define IP_MAXPACKET 65535 /* 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.
- */
- struct tcpstat {
- #ifdef OLDSTAT
- /*
- * Declare statistics the same as in 4.3
- * at the start of tcpstat (same size and
- * position) for netstat.
- */
- int tcps_rcvbadsum;
- int tcps_rcvbadoff;
- int tcps_rcvshort;
- int tcps_badsegs;
- int tcps_unack;
- #define tcps_badsum tcps_rcvbadsum
- #define tcps_badoff tcps_rcvbadoff
- #define tcps_hdrops tcps_rcvshort
-
- #endif OLDSTAT
- 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 */
- #ifndef OLDSTAT
- 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 */
- #endif
- 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 KERNEL
- 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
-
- #endif _TCP_VAR
-