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Annotation of researchv10dc/lsys/sys/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 for tcpiphdr */
        !            12:        struct queue    *so_rq;
        !            13:        struct queue    *so_wq;
        !            14:        int             so_rcount;
        !            15:        int             so_wcount;      /* because q->count is inaccurate */
        !            16:        struct  tcpcb   *so_head;       /* parent who listened */
        !            17:        int             so_dev;
        !            18:        int             so_state;
        !            19:        int             so_options;
        !            20:        in_addr         so_laddr;
        !            21:        in_addr         so_faddr;
        !            22:        tcp_port        so_lport;
        !            23:        tcp_port        so_fport;
        !            24:        int             so_oobmark;
        !            25:        int             so_delimcnt;    /* to detect logical eof */
        !            26:        short   t_state;                /* state of this connection */
        !            27:        short   t_timer[TCPT_NTIMERS];  /* tcp timers */
        !            28:        short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
        !            29:        struct block    *t_tcpopt;      /* tcp options */
        !            30:        struct block    *t_ipopt;       /* ip options */
        !            31:        short   t_maxseg;               /* maximum segment size */
        !            32:        char    t_force;                /* 1 if forcing out a byte */
        !            33:        u_char  t_flags;
        !            34: #define        TF_ACKNOW       0x01                    /* ack peer immediately */
        !            35: #define        TF_DELACK       0x02                    /* ack, but try to delay it */
        !            36: #define        TF_DONTKEEP     0x04                    /* don't use keep-alives */
        !            37: #define        TF_NOOPT        0x08                    /* don't use tcp options */
        !            38:        struct block    *t_template;    /* skeletal tcpiphdr - packet for transmit */
        !            39:        struct inpcb    *t_inpcb;       /* back pointer to internet pcb */
        !            40: /*
        !            41:  * The following fields are used as in the protocol specification.
        !            42:  * See RFC783, Dec. 1981, page 21.
        !            43:  */
        !            44: /* send sequence variables */
        !            45:        tcp_seq snd_una;                /* send unacknowledged */
        !            46:        tcp_seq snd_nxt;                /* send next */
        !            47:        tcp_seq snd_up;                 /* send urgent pointer */
        !            48:        tcp_seq snd_wl1;                /* window update seg seq number */
        !            49:        tcp_seq snd_wl2;                /* window update seg ack number */
        !            50:        tcp_seq iss;                    /* initial send sequence number */
        !            51:        u_short snd_wnd;                /* send window */
        !            52: /* receive sequence variables */
        !            53:        short   rcv_wnd;                /* receive window */
        !            54:        tcp_seq rcv_nxt;                /* receive next */
        !            55:        tcp_seq rcv_up;                 /* receive urgent pointer */
        !            56:        tcp_seq irs;                    /* initial receive sequence number */
        !            57: /*
        !            58:  * Additional variables for this implementation.
        !            59:  */
        !            60: /* receive variables */
        !            61:        tcp_seq rcv_adv;                /* advertised window */
        !            62: /* retransmit variables */
        !            63:        tcp_seq snd_max;                /* highest sequence number sent
        !            64:                                           used to recognize retransmits */
        !            65: /* transmit timing stuff */
        !            66:        short   t_idle;                 /* inactivity time */
        !            67:        short   t_rtt;                  /* round trip time */
        !            68:        tcp_seq t_rtseq;                /* sequence number being timed */
        !            69:        float   t_srtt;                 /* smoothed round-trip time */
        !            70: /* out-of-band data */
        !            71:        char    t_oobflags;             /* have some */
        !            72:        char    t_iobc;                 /* input character */
        !            73: #define        TCPOOB_HAVEDATA 0x01
        !            74: };
        !            75: 
        !            76: struct tcpstat {
        !            77:        int     tcps_badsum;
        !            78:        int     tcps_badoff;
        !            79:        int     tcps_hdrops;
        !            80:        int     tcps_badsegs;
        !            81:        int     tcps_unack;
        !            82:        int     tcps_timeouts[4];       /* timeouts while ESTABLISHED */
        !            83:        int     tcps_duplicates;        /* other side retransmitting */
        !            84:        int     tcps_delayed;           /* packets out of sequence? */
        !            85: };
        !            86: 
        !            87: #define SO_DONTROUTE   0x1
        !            88: #define SO_KEEPALIVE   0x2
        !            89: #define SO_ACCEPTCONN  0x4     /* this is real */
        !            90: #define SO_TRUSTED     0x8     /* use a trusted < 1024 port */
        !            91: 
        !            92: #define SS_OPEN                0x1     /* by user */
        !            93: #define SS_PLEASEOPEN  0x2     /* waiting for user open */
        !            94: #define SS_RCVATMARK   0x4     /* some kind of OOB */
        !            95: #define SS_WAITING     0x8     /* wait for user control */
        !            96: #define SS_HANGUP      0x20    /* HANGUP on TH_FIN */
        !            97: #define SS_HUNGUP      0x40    /* socket has been hung up (avoid multiple) */
        !            98: #define SS_WCLOSED     0x80    /* write side is closed */
        !            99: 
        !           100: #define socantsendmore(tp) (tp->so_delimcnt>1 || tp->so_state&SS_WCLOSED)
        !           101: #define sbrcvspace(tp) (tp->so_rq ?\
        !           102:                         (sorcvhiwat(tp) - tp->so_rcount)\
        !           103:                         : 0)
        !           104: #define sosndcc(tp)    (tp->so_wq ? (tp->so_wcount) : 0)
        !           105: #define sototcpcb(tp)  (tp->so_tcpcb)
        !           106: #define sorcvhiwat(tp) (tp->so_rq ? (tp->so_rq->qinfo->limit)\
        !           107:                        : 0)
        !           108: #define sohasoutofband(tp)
        !           109: 
        !           110: #ifdef KERNEL
        !           111: extern struct tcpcb *tcpcb_lookup();
        !           112: extern struct tcpcb *tcp_newconn();
        !           113: #endif
        !           114: #ifdef KERNEL
        !           115: struct tcpstat tcpstat;        /* tcp statistics */
        !           116: struct tcpcb *tcp_close(), *tcp_drop();
        !           117: struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
        !           118: #endif

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