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Annotation of 43BSD/sys/netinet/tcp_var.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)tcp_var.h   7.1 (Berkeley) 6/5/86
                      7:  */
                      8: 
                      9: /*
                     10:  * Kernel variables for tcp.
                     11:  */
                     12: 
                     13: /*
                     14:  * Tcp control block, one per tcp; fields:
                     15:  */
                     16: struct tcpcb {
                     17:        struct  tcpiphdr *seg_next;     /* sequencing queue */
                     18:        struct  tcpiphdr *seg_prev;
                     19:        short   t_state;                /* state of this connection */
                     20:        short   t_timer[TCPT_NTIMERS];  /* tcp timers */
                     21:        short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
                     22:        struct  mbuf *t_tcpopt;         /* tcp options */
                     23:        u_short t_maxseg;               /* maximum segment size */
                     24:        char    t_force;                /* 1 if forcing out a byte */
                     25:        u_char  t_flags;
                     26: #define        TF_ACKNOW       0x01            /* ack peer immediately */
                     27: #define        TF_DELACK       0x02            /* ack, but try to delay it */
                     28: #define        TF_NODELAY      0x04            /* don't delay packets to coalesce */
                     29: #define        TF_NOOPT        0x08            /* don't use tcp options */
                     30: #define        TF_SENTFIN      0x10            /* have sent FIN */
                     31:        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
                     32:        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
                     33: /*
                     34:  * The following fields are used as in the protocol specification.
                     35:  * See RFC783, Dec. 1981, page 21.
                     36:  */
                     37: /* send sequence variables */
                     38:        tcp_seq snd_una;                /* send unacknowledged */
                     39:        tcp_seq snd_nxt;                /* send next */
                     40:        tcp_seq snd_up;                 /* send urgent pointer */
                     41:        tcp_seq snd_wl1;                /* window update seg seq number */
                     42:        tcp_seq snd_wl2;                /* window update seg ack number */
                     43:        tcp_seq iss;                    /* initial send sequence number */
                     44:        u_short snd_wnd;                /* send window */
                     45: /* receive sequence variables */
                     46:        u_short rcv_wnd;                /* receive window */
                     47:        tcp_seq rcv_nxt;                /* receive next */
                     48:        tcp_seq rcv_up;                 /* receive urgent pointer */
                     49:        tcp_seq irs;                    /* initial receive sequence number */
                     50: /*
                     51:  * Additional variables for this implementation.
                     52:  */
                     53: /* receive variables */
                     54:        tcp_seq rcv_adv;                /* advertised window */
                     55: /* retransmit variables */
                     56:        tcp_seq snd_max;                /* highest sequence number sent
                     57:                                         * used to recognize retransmits
                     58:                                         */
                     59: /* congestion control (for source quench) */
                     60:        u_short snd_cwnd;               /* congestion-controlled window */
                     61: /* transmit timing stuff */
                     62:        short   t_idle;                 /* inactivity time */
                     63:        short   t_rtt;                  /* round trip time */
                     64:        u_short max_rcvd;               /* most peer has sent into window */
                     65:        tcp_seq t_rtseq;                /* sequence number being timed */
                     66:        float   t_srtt;                 /* smoothed round-trip time */
                     67:        u_short max_sndwnd;             /* largest window peer has offered */
                     68: /* out-of-band data */
                     69:        char    t_oobflags;             /* have some */
                     70:        char    t_iobc;                 /* input character */
                     71: #define        TCPOOB_HAVEDATA 0x01
                     72: #define        TCPOOB_HADDATA  0x02
                     73: };
                     74: 
                     75: #define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
                     76: #define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
                     77: 
                     78: struct tcpstat {
                     79:        int     tcps_badsum;
                     80:        int     tcps_badoff;
                     81:        int     tcps_hdrops;
                     82:        int     tcps_badsegs;
                     83:        int     tcps_unack;
                     84: };
                     85: 
                     86: #ifdef KERNEL
                     87: struct inpcb tcb;              /* head of queue of active tcpcb's */
                     88: struct tcpstat tcpstat;        /* tcp statistics */
                     89: struct tcpiphdr *tcp_template();
                     90: struct tcpcb *tcp_close(), *tcp_drop();
                     91: struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
                     92: #endif

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