Return to tcp_var.h CVS log

Up to [Research Unix] / researchv9 / sys / h / inet

Annotation of researchv9/sys/h/inet/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:        struct  socket *t_socket;
        !            14:        short   t_state;                /* state of this connection */
        !            15:        short   t_timer[TCPT_NTIMERS];  /* tcp timers */
        !            16:        short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
        !            17:        struct  mbuf *t_tcpopt;         /* tcp options */
        !            18:        struct  mbuf *t_ipopt;          /* ip options */
        !            19:        short   t_maxseg;               /* maximum segment size */
        !            20:        char    t_force;                /* 1 if forcing out a byte */
        !            21:        u_char  t_flags;
        !            22: #define        TF_ACKNOW       0x01                    /* ack peer immediately */
        !            23: #define        TF_DELACK       0x02                    /* ack, but try to delay it */
        !            24: #define        TF_DONTKEEP     0x04                    /* don't use keep-alives */
        !            25: #define        TF_NOOPT        0x08                    /* don't use tcp options */
        !            26:        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        !            27:        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
        !            28: /*
        !            29:  * The following fields are used as in the protocol specification.
        !            30:  * See RFC783, Dec. 1981, page 21.
        !            31:  */
        !            32: /* send sequence variables */
        !            33:        tcp_seq snd_una;                /* send unacknowledged */
        !            34:        tcp_seq snd_nxt;                /* send next */
        !            35:        tcp_seq snd_up;                 /* send urgent pointer */
        !            36:        tcp_seq snd_wl1;                /* window update seg seq number */
        !            37:        tcp_seq snd_wl2;                /* window update seg ack number */
        !            38:        tcp_seq iss;                    /* initial send sequence number */
        !            39:        u_short snd_wnd;                /* send window */
        !            40: /* receive sequence variables */
        !            41:        short   rcv_wnd;                /* receive window */
        !            42:        tcp_seq rcv_nxt;                /* receive next */
        !            43:        tcp_seq rcv_up;                 /* receive urgent pointer */
        !            44:        tcp_seq irs;                    /* initial receive sequence number */
        !            45: /*
        !            46:  * Additional variables for this implementation.
        !            47:  */
        !            48: /* receive variables */
        !            49:        tcp_seq rcv_adv;                /* advertised window */
        !            50: /* retransmit variables */
        !            51:        tcp_seq snd_max;                /* highest sequence number sent
        !            52:                                           used to recognize retransmits */
        !            53: /* transmit timing stuff */
        !            54:        short   t_idle;                 /* inactivity time */
        !            55:        short   t_rtt;                  /* round trip time */
        !            56:        tcp_seq t_rtseq;                /* sequence number being timed */
        !            57:        float   t_srtt;                 /* smoothed round-trip time */
        !            58: /* out-of-band data */
        !            59:        char    t_oobflags;             /* have some */
        !            60:        char    t_iobc;                 /* input character */
        !            61: #define        TCPOOB_HAVEDATA 0x01
        !            62: };
        !            63: 
        !            64: struct tcpstat {
        !            65:        int     tcps_badsum;
        !            66:        int     tcps_badoff;
        !            67:        int     tcps_hdrops;
        !            68:        int     tcps_badsegs;
        !            69:        int     tcps_unack;
        !            70:        int     tcps_timeouts[4];       /* timeouts while ESTABLISHED */
        !            71:        int     tcps_duplicates;        /* other side retransmitting */
        !            72:        int     tcps_delayed;           /* packets out of sequence? */
        !            73: };
        !            74: 
        !            75: #ifdef KERNEL
        !            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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.