usr/src/uts/common/netinet/tcp_var.h

   1 /*
   2  * Copyright (c) 1997-1998 by Sun Microsystems, Inc.
   3  * All rights reserved.
   4  */
   5
   6 /*
   7  * Copyright (c) 1982, 1986 Regents of the University of California.
   8  * All rights reserved.  The Berkeley software License Agreement
   9  * specifies the terms and conditions for redistribution.
  10  */
  11
  12 /*
  13  * Kernel variables for tcp.
  14  */
  15
  16 #ifndef _NETINET_TCP_VAR_H
  17 #define _NETINET_TCP_VAR_H
  18
  19 #pragma ident   "%Z%%M% %I%     %E% SMI"
  20 /* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87    */
  21
  22 #ifdef  __cplusplus
  23 extern "C" {
  24 #endif
  25
  26 /*
  27  * Tcp control block, one per tcp; fields:
  28  */
  29 struct tcpcb {
  30         struct  tcpiphdr *seg_next;     /* sequencing queue */
  31         struct  tcpiphdr *seg_prev;
  32         short   t_state;                /* state of this connection */
  33         short   t_timer[TCPT_NTIMERS];  /* tcp timers */
  34         short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
  35         short   t_rxtcur;               /* current retransmit value */
  36         short   t_dupacks;              /* consecutive dup acks recd */
  37         ushort_t t_maxseg;              /* maximum segment size */
  38         char    t_force;                /* 1 if forcing out a byte */
  39         uchar_t t_flags;
  40 #define TF_ACKNOW       0x01            /* ack peer immediately */
  41 #define TF_DELACK       0x02            /* ack, but try to delay it */
  42 #define TF_NODELAY      0x04            /* don't delay packets to coalesce */
  43 #define TF_NOOPT        0x08            /* don't use tcp options */
  44 #define TF_SENTFIN      0x10            /* have sent FIN */
  45         struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
  46         struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
  47 /*
  48  * The following fields are used as in the protocol specification.
  49  * See RFC783, Dec. 1981, page 21.
  50  */
  51 /* send sequence variables */
  52         tcp_seq snd_una;                /* send unacknowledged */
  53         tcp_seq snd_nxt;                /* send next */
  54         tcp_seq snd_up;                 /* send urgent pointer */
  55         tcp_seq snd_wl1;                /* window update seg seq number */
  56         tcp_seq snd_wl2;                /* window update seg ack number */
  57         tcp_seq iss;                    /* initial send sequence number */
  58         ushort_t snd_wnd;               /* send window */
  59 /* receive sequence variables */
  60         ushort_t rcv_wnd;               /* receive window */
  61         tcp_seq rcv_nxt;                /* receive next */
  62         tcp_seq rcv_up;                 /* receive urgent pointer */
  63         tcp_seq irs;                    /* initial receive sequence number */
  64 /*
  65  * Additional variables for this implementation.
  66  */
  67 /* receive variables */
  68         tcp_seq rcv_adv;                /* advertised window */
  69 /* retransmit variables */
  70         tcp_seq snd_max;                /* highest sequence number sent */
  71                                         /* used to recognize retransmits */
  72
  73 /* congestion control (for slow start, source quench, retransmit after loss) */
  74         ushort_t snd_cwnd;              /* congestion-controlled window */
  75         ushort_t snd_ssthresh;          /* snd_cwnd size threshhold for */
  76                                         /* for slow start exponential to */
  77 /*
  78  * transmit timing stuff.
  79  * srtt and rttvar are stored as fixed point; for convenience in smoothing,
  80  * srtt has 3 bits to the right of the binary point, rttvar has 2.
  81  * "Variance" is actually smoothed difference.
  82  */
  83         short   t_idle;                 /* inactivity time */
  84         short   t_rtt;                  /* round trip time */
  85         tcp_seq t_rtseq;                /* sequence number being timed */
  86         short   t_srtt;                 /* smoothed round-trip time */
  87         short   t_rttvar;               /* variance in round-trip time */
  88         ushort_t max_rcvd;              /* most peer has sent into window */
  89         ushort_t max_sndwnd;            /* largest window peer has offered */
  90 /* out-of-band data */
  91         char    t_oobflags;             /* have some */
  92         char    t_iobc;                 /* input character */
  93 #define TCPOOB_HAVEDATA 0x01
  94 #define TCPOOB_HADDATA  0x02
  95 };
  96
  97 #define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
  98 #define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
  99
 100 /*
 101  * TCP statistics.
 102  * Many of these should be kept per connection,
 103  * but that's inconvenient at the moment.
 104  */
 105 struct  tcpstat {
 106         uint_t  tcps_connattempt;       /* connections initiated */
 107         uint_t  tcps_accepts;           /* connections accepted */
 108         uint_t  tcps_connects;          /* connections established */
 109         uint_t  tcps_drops;             /* connections dropped */
 110         uint_t  tcps_conndrops;         /* embryonic connections dropped */
 111         uint_t  tcps_closed;            /* conn. closed (includes drops) */
 112         uint_t  tcps_segstimed;         /* segs where we tried to get rtt */
 113         uint_t  tcps_rttupdated;        /* times we succeeded */
 114         uint_t  tcps_delack;            /* delayed acks sent */
 115         uint_t  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
 116         uint_t  tcps_rexmttimeo;        /* retransmit timeouts */
 117         uint_t  tcps_persisttimeo;      /* persist timeouts */
 118         uint_t  tcps_keeptimeo;         /* keepalive timeouts */
 119         uint_t  tcps_keepprobe;         /* keepalive probes sent */
 120         uint_t  tcps_keepdrops;         /* connections dropped in keepalive */
 121
 122         uint_t  tcps_sndtotal;          /* total packets sent */
 123         uint_t  tcps_sndpack;           /* data packets sent */
 124         uint_t  tcps_sndbyte;           /* data bytes sent */
 125         uint_t  tcps_sndrexmitpack;     /* data packets retransmitted */
 126         uint_t  tcps_sndrexmitbyte;     /* data bytes retransmitted */
 127         uint_t  tcps_sndacks;           /* ack-only packets sent */
 128         uint_t  tcps_sndprobe;          /* window probes sent */
 129         uint_t  tcps_sndurg;            /* packets sent with URG only */
 130         uint_t  tcps_sndwinup;          /* window update-only packets sent */
 131         uint_t  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
 132
 133         uint_t  tcps_rcvtotal;          /* total packets received */
 134         uint_t  tcps_rcvpack;           /* packets received in sequence */
 135         uint_t  tcps_rcvbyte;           /* bytes received in sequence */
 136         uint_t  tcps_rcvbadsum;         /* packets received with ccksum errs */
 137         uint_t  tcps_rcvbadoff;         /* packets received with bad offset */
 138         uint_t  tcps_rcvshort;          /* packets received too short */
 139         uint_t  tcps_rcvduppack;        /* duplicate-only packets received */
 140         uint_t  tcps_rcvdupbyte;        /* duplicate-only bytes received */
 141         uint_t  tcps_rcvpartduppack;    /* packets with some duplicate data */
 142         uint_t  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
 143         uint_t  tcps_rcvoopack;         /* out-of-order packets received */
 144         uint_t  tcps_rcvoobyte;         /* out-of-order bytes received */
 145         uint_t  tcps_rcvpackafterwin;   /* packets with data after window */
 146         uint_t  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
 147         uint_t  tcps_rcvafterclose;     /* packets rcvd after "close" */
 148         uint_t  tcps_rcvwinprobe;       /* rcvd window probe packets */
 149         uint_t  tcps_rcvdupack;         /* rcvd duplicate acks */
 150         uint_t  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
 151         uint_t  tcps_rcvackpack;        /* rcvd ack packets */
 152         uint_t  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
 153         uint_t  tcps_rcvwinupd;         /* rcvd window update packets */
 154 };
 155
 156 #define TCP_COMPAT_42
 157
 158 #ifdef  __cplusplus
 159 }
 160 #endif
 161
 162 #endif  /* _NETINET_TCP_VAR_H */