/*
- * Copyright (c) 1982 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
*
- * @(#)tcp_var.h 6.4 (Berkeley) %G%
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * @(#)tcp_var.h 7.8 (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)
*/
+#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 ---------------- */
+
+/*
+ * 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
+
+/*
+ * 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.
*/
short t_state; /* state of this connection */
short t_timer[TCPT_NTIMERS]; /* tcp timers */
short t_rxtshift; /* log(2) of rexmt exp. backoff */
- struct mbuf *t_tcpopt; /* tcp options */
- short t_maxseg; /* maximum segment size */
+ 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_DONTKEEP 0x04 /* don't use keep-alives */
-#define TF_NOOPT 0x08 /* don't use tcp options */
+#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 */
/*
tcp_seq iss; /* initial send sequence number */
u_short snd_wnd; /* send window */
/* receive sequence variables */
- short rcv_wnd; /* receive window */
+ 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 */
tcp_seq snd_max; /* highest sequence number sent
* used to recognize retransmits
*/
-/* congestion control (for source quench) */
+/* congestion control (for slow start, source quench, retransmit after loss) */
u_short snd_cwnd; /* congestion-controlled window */
-/* transmit timing stuff */
+ 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 */
- u_short max_rcvd; /* most peer has sent into window */
tcp_seq t_rtseq; /* sequence number being timed */
- float t_srtt; /* smoothed round-trip time */
+ 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 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 {
- int tcps_badsum;
- int tcps_badoff;
- int tcps_hdrops;
+#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
+#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
+#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
+#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