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Annotation of 42BSD/sys/netinet/tcp_var.h, revision 1.1

1.1     ! root        1: /*     tcp_var.h       6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Kernel variables for tcp.
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  * Tcp control block, one per tcp; fields:
        !             9:  */
        !            10: struct tcpcb {
        !            11:        struct  tcpiphdr *seg_next;     /* sequencing queue */
        !            12:        struct  tcpiphdr *seg_prev;
        !            13:        short   t_state;                /* state of this connection */
        !            14:        short   t_timer[TCPT_NTIMERS];  /* tcp timers */
        !            15:        short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
        !            16:        struct  mbuf *t_tcpopt;         /* tcp options */
        !            17:        struct  mbuf *t_ipopt;          /* ip options */
        !            18:        short   t_maxseg;               /* maximum segment size */
        !            19:        char    t_force;                /* 1 if forcing out a byte */
        !            20:        u_char  t_flags;
        !            21: #define        TF_ACKNOW       0x01                    /* ack peer immediately */
        !            22: #define        TF_DELACK       0x02                    /* ack, but try to delay it */
        !            23: #define        TF_DONTKEEP     0x04                    /* don't use keep-alives */
        !            24: #define        TF_NOOPT        0x08                    /* don't use tcp options */
        !            25:        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        !            26:        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
        !            27: /*
        !            28:  * The following fields are used as in the protocol specification.
        !            29:  * See RFC783, Dec. 1981, page 21.
        !            30:  */
        !            31: /* send sequence variables */
        !            32:        tcp_seq snd_una;                /* send unacknowledged */
        !            33:        tcp_seq snd_nxt;                /* send next */
        !            34:        tcp_seq snd_up;                 /* send urgent pointer */
        !            35:        tcp_seq snd_wl1;                /* window update seg seq number */
        !            36:        tcp_seq snd_wl2;                /* window update seg ack number */
        !            37:        tcp_seq iss;                    /* initial send sequence number */
        !            38:        u_short snd_wnd;                /* send window */
        !            39: /* receive sequence variables */
        !            40:        short   rcv_wnd;                /* receive window */
        !            41:        tcp_seq rcv_nxt;                /* receive next */
        !            42:        tcp_seq rcv_up;                 /* receive urgent pointer */
        !            43:        tcp_seq irs;                    /* initial receive sequence number */
        !            44: /*
        !            45:  * Additional variables for this implementation.
        !            46:  */
        !            47: /* receive variables */
        !            48:        tcp_seq rcv_adv;                /* advertised window */
        !            49: /* retransmit variables */
        !            50:        tcp_seq snd_max;                /* highest sequence number sent
        !            51:                                           used to recognize retransmits */
        !            52: /* transmit timing stuff */
        !            53:        short   t_idle;                 /* inactivity time */
        !            54:        short   t_rtt;                  /* round trip time */
        !            55:        tcp_seq t_rtseq;                /* sequence number being timed */
        !            56:        float   t_srtt;                 /* smoothed round-trip time */
        !            57: /* out-of-band data */
        !            58:        char    t_oobflags;             /* have some */
        !            59:        char    t_iobc;                 /* input character */
        !            60: #define        TCPOOB_HAVEDATA 0x01
        !            61: };
        !            62: 
        !            63: #define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
        !            64: #define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
        !            65: 
        !            66: struct tcpstat {
        !            67:        int     tcps_badsum;
        !            68:        int     tcps_badoff;
        !            69:        int     tcps_hdrops;
        !            70:        int     tcps_badsegs;
        !            71:        int     tcps_unack;
        !            72: };
        !            73: 
        !            74: #ifdef KERNEL
        !            75: struct inpcb tcb;              /* head of queue of active tcpcb's */
        !            76: struct tcpstat tcpstat;        /* tcp statistics */
        !            77: struct tcpiphdr *tcp_template();
        !            78: struct tcpcb *tcp_close(), *tcp_drop();
        !            79: struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
        !            80: #endif

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