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[unix-history] / usr / src / sys / netinet / tcp_var.h
diff --git a/usr/src/sys/netinet/tcp_var.h b/usr/src/sys/netinet/tcp_var.h
index e44cc50..61c672e 100644 (file)
--- a/usr/src/sys/netinet/tcp_var.h
+++ b/usr/src/sys/netinet/tcp_var.h
@@ -1,4 +1,125 @@
-/*     tcp_var.h       6.2     84/11/14        */
+/*
+ * 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 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.
 
 /*
  * Kernel variables for tcp.
@@ -13,15 +134,16 @@ struct tcpcb {
        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_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 */
-       struct  mbuf *t_ipopt;          /* ip 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;
        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 */
 /*
        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
 /*
@@ -37,7 +159,7 @@ struct tcpcb {
        tcp_seq iss;                    /* initial send sequence number */
        u_short snd_wnd;                /* send window */
 /* receive sequence variables */
        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 rcv_nxt;                /* receive next */
        tcp_seq rcv_up;                 /* receive urgent pointer */
        tcp_seq irs;                    /* initial receive sequence number */
@@ -50,28 +172,124 @@ struct tcpcb {
        tcp_seq snd_max;                /* highest sequence number sent
                                         * used to recognize retransmits
                                         */
        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 */
        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 */
        tcp_seq t_rtseq;                /* sequence number being timed */
        short   t_idle;                 /* inactivity time */
        short   t_rtt;                  /* round trip time */
        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        TCPOOB_HAVEDATA 0x01
 /* 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)))
 
 };
 
 #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 {
 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;
        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
 };
 
 #ifdef KERNEL
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.