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