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C/C++ Source or Header  |  1994-06-30  |  6.2 KB  |  159 lines
  1. /*    @(#)tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87    */
  2.  
  3. /*
  4.  * Copyright (c) 1982, 1986 Regents of the University of California.
  5.  * All rights reserved.  The Berkeley software License Agreement
  6.  * specifies the terms and conditions for redistribution.
  7.  */
  8.  
  9. /*
  10.  * Kernel variables for tcp.
  11.  */
  12.  
  13. #ifndef _netinet_tcp_var_h
  14. #define _netinet_tcp_var_h
  15.  
  16. /*
  17.  * Tcp control block, one per tcp; fields:
  18.  */
  19. struct tcpcb {
  20.     struct    tcpiphdr *seg_next;    /* sequencing queue */
  21.     struct    tcpiphdr *seg_prev;
  22.     short    t_state;        /* state of this connection */
  23.     short    t_timer[TCPT_NTIMERS];    /* tcp timers */
  24.     short    t_rxtshift;        /* log(2) of rexmt exp. backoff */
  25.     short    t_rxtcur;        /* current retransmit value */
  26.     short    t_dupacks;        /* consecutive dup acks recd */
  27.     u_short    t_maxseg;        /* maximum segment size */
  28.     char    t_force;        /* 1 if forcing out a byte */
  29.     u_char    t_flags;
  30. #define    TF_ACKNOW    0x01        /* ack peer immediately */
  31. #define    TF_DELACK    0x02        /* ack, but try to delay it */
  32. #define    TF_NODELAY    0x04        /* don't delay packets to coalesce */
  33. #define    TF_NOOPT    0x08        /* don't use tcp options */
  34. #define    TF_SENTFIN    0x10        /* have sent FIN */
  35.     struct    tcpiphdr *t_template;    /* skeletal packet for transmit */
  36.     struct    inpcb *t_inpcb;        /* back pointer to internet pcb */
  37. /*
  38.  * The following fields are used as in the protocol specification.
  39.  * See RFC783, Dec. 1981, page 21.
  40.  */
  41. /* send sequence variables */
  42.     tcp_seq    snd_una;        /* send unacknowledged */
  43.     tcp_seq    snd_nxt;        /* send next */
  44.     tcp_seq    snd_up;            /* send urgent pointer */
  45.     tcp_seq    snd_wl1;        /* window update seg seq number */
  46.     tcp_seq    snd_wl2;        /* window update seg ack number */
  47.     tcp_seq    iss;            /* initial send sequence number */
  48.     u_short    snd_wnd;        /* send window */
  49. /* receive sequence variables */
  50.     u_short    rcv_wnd;        /* receive window */
  51.     tcp_seq    rcv_nxt;        /* receive next */
  52.     tcp_seq    rcv_up;            /* receive urgent pointer */
  53.     tcp_seq    irs;            /* initial receive sequence number */
  54. /*
  55.  * Additional variables for this implementation.
  56.  */
  57. /* receive variables */
  58.     tcp_seq    rcv_adv;        /* advertised window */
  59. /* retransmit variables */
  60.     tcp_seq    snd_max;        /* highest sequence number sent
  61.                      * used to recognize retransmits
  62.                      */
  63. /* congestion control (for slow start, source quench, retransmit after loss) */
  64.     u_short    snd_cwnd;        /* congestion-controlled window */
  65.     u_short snd_ssthresh;        /* snd_cwnd size threshhold for
  66.                      * for slow start exponential to
  67.                      * linear switch */
  68. /*
  69.  * transmit timing stuff.
  70.  * srtt and rttvar are stored as fixed point; for convenience in smoothing,
  71.  * srtt has 3 bits to the right of the binary point, rttvar has 2.
  72.  * "Variance" is actually smoothed difference.
  73.  */
  74.     short    t_idle;            /* inactivity time */
  75.     short    t_rtt;            /* round trip time */
  76.     tcp_seq    t_rtseq;        /* sequence number being timed */
  77.     short    t_srtt;            /* smoothed round-trip time */
  78.     short    t_rttvar;        /* variance in round-trip time */
  79.     u_short max_rcvd;        /* most peer has sent into window */
  80.     u_short    max_sndwnd;        /* largest window peer has offered */
  81. /* out-of-band data */
  82.     char    t_oobflags;        /* have some */
  83.     char    t_iobc;            /* input character */
  84. #define    TCPOOB_HAVEDATA    0x01
  85. #define    TCPOOB_HADDATA    0x02
  86. };
  87.  
  88. #define    intotcpcb(ip)    ((struct tcpcb *)(ip)->inp_ppcb)
  89. #define    sototcpcb(so)    (intotcpcb(sotoinpcb(so)))
  90.  
  91. /*
  92.  * TCP statistics.
  93.  * Many of these should be kept per connection,
  94.  * but that's inconvenient at the moment.
  95.  */
  96. struct    tcpstat {
  97.     u_long    tcps_connattempt;    /* connections initiated */
  98.     u_long    tcps_accepts;        /* connections accepted */
  99.     u_long    tcps_connects;        /* connections established */
  100.     u_long    tcps_drops;        /* connections dropped */
  101.     u_long    tcps_conndrops;        /* embryonic connections dropped */
  102.     u_long    tcps_closed;        /* conn. closed (includes drops) */
  103.     u_long    tcps_segstimed;        /* segs where we tried to get rtt */
  104.     u_long    tcps_rttupdated;    /* times we succeeded */
  105.     u_long    tcps_delack;        /* delayed acks sent */
  106.     u_long    tcps_timeoutdrop;    /* conn. dropped in rxmt timeout */
  107.     u_long    tcps_rexmttimeo;    /* retransmit timeouts */
  108.     u_long    tcps_persisttimeo;    /* persist timeouts */
  109.     u_long    tcps_keeptimeo;        /* keepalive timeouts */
  110.     u_long    tcps_keepprobe;        /* keepalive probes sent */
  111.     u_long    tcps_keepdrops;        /* connections dropped in keepalive */
  112.  
  113.     u_long    tcps_sndtotal;        /* total packets sent */
  114.     u_long    tcps_sndpack;        /* data packets sent */
  115.     u_long    tcps_sndbyte;        /* data bytes sent */
  116.     u_long    tcps_sndrexmitpack;    /* data packets retransmitted */
  117.     u_long    tcps_sndrexmitbyte;    /* data bytes retransmitted */
  118.     u_long    tcps_sndacks;        /* ack-only packets sent */
  119.     u_long    tcps_sndprobe;        /* window probes sent */
  120.     u_long    tcps_sndurg;        /* packets sent with URG only */
  121.     u_long    tcps_sndwinup;        /* window update-only packets sent */
  122.     u_long    tcps_sndctrl;        /* control (SYN|FIN|RST) packets sent */
  123.  
  124.     u_long    tcps_rcvtotal;        /* total packets received */
  125.     u_long    tcps_rcvpack;        /* packets received in sequence */
  126.     u_long    tcps_rcvbyte;        /* bytes received in sequence */
  127.     u_long    tcps_rcvbadsum;        /* packets received with ccksum errs */
  128.     u_long    tcps_rcvbadoff;        /* packets received with bad offset */
  129.     u_long    tcps_rcvshort;        /* packets received too short */
  130.     u_long    tcps_rcvduppack;    /* duplicate-only packets received */
  131.     u_long    tcps_rcvdupbyte;    /* duplicate-only bytes received */
  132.     u_long    tcps_rcvpartduppack;    /* packets with some duplicate data */
  133.     u_long    tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
  134.     u_long    tcps_rcvoopack;        /* out-of-order packets received */
  135.     u_long    tcps_rcvoobyte;        /* out-of-order bytes received */
  136.     u_long    tcps_rcvpackafterwin;    /* packets with data after window */
  137.     u_long    tcps_rcvbyteafterwin;    /* bytes rcvd after window */
  138.     u_long    tcps_rcvafterclose;    /* packets rcvd after "close" */
  139.     u_long    tcps_rcvwinprobe;    /* rcvd window probe packets */
  140.     u_long    tcps_rcvdupack;        /* rcvd duplicate acks */
  141.     u_long    tcps_rcvacktoomuch;    /* rcvd acks for unsent data */
  142.     u_long    tcps_rcvackpack;    /* rcvd ack packets */
  143.     u_long    tcps_rcvackbyte;    /* bytes acked by rcvd acks */
  144.     u_long    tcps_rcvwinupd;        /* rcvd window update packets */
  145. };
  146.  
  147. #ifdef KERNEL
  148. struct    inpcb tcb;        /* head of queue of active tcpcb's */
  149. struct    tcpstat tcpstat;    /* tcp statistics */
  150. struct    tcpiphdr *tcp_template();
  151. struct    tcpcb *tcp_close(), *tcp_drop();
  152. struct    tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
  153. #endif
  154. #ifdef sun
  155. #define TCP_COMPAT_42
  156. #endif
  157.  
  158. #endif /*!_netinet_tcp_var_h*/
  159.