BSD 4_1c_2 development

Work on file a/sys/netinet/tcp_var.h

Synthesized-from: CSRG/cd1/4.1c.2

diff --git a/a/sys/netinet/tcp_var.h b/a/sys/netinet/tcp_var.h
new file mode 100644 (file)
index 0000000..a1ce743
--- /dev/null
+++ b/a/sys/netinet/tcp_var.h
@@ -0,0 +1,80 @@
+/*     tcp_var.h       4.18    83/01/17        */
+
+/*
+ * Kernel variables for tcp.
+ */
+
+/*
+ * Tcp control block, one per tcp; fields:
+ */
+struct tcpcb {
+       struct  tcpiphdr *seg_next;     /* sequencing queue */
+       struct  tcpiphdr *seg_prev;
+       short   t_state;                /* state of this connection */
+       short   t_timer[TCPT_NTIMERS];  /* tcp timers */
+       short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
+       struct  mbuf *t_tcpopt;         /* tcp options */
+       struct  mbuf *t_ipopt;          /* ip options */
+       short   t_maxseg;               /* maximum segment size */
+       char    t_force;                /* 1 if forcing out a byte */
+       u_char  t_flags;
+#define        TF_ACKNOW       0x01                    /* ack peer immediately */
+#define        TF_DELACK       0x02                    /* ack, but try to delay it */
+#define        TF_DONTKEEP     0x04                    /* don't use keep-alives */
+#define        TF_NOOPT        0x08                    /* don't use tcp options */
+       struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
+       struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
+/*
+ * The following fields are used as in the protocol specification.
+ * See RFC783, Dec. 1981, page 21.
+ */
+/* send sequence variables */
+       tcp_seq snd_una;                /* send unacknowledged */
+       tcp_seq snd_nxt;                /* send next */
+       tcp_seq snd_up;                 /* send urgent pointer */
+       tcp_seq snd_wl1;                /* window update seg seq number */
+       tcp_seq snd_wl2;                /* window update seg ack number */
+       tcp_seq iss;                    /* initial send sequence number */
+       u_short snd_wnd;                /* send window */
+/* receive sequence variables */
+       short   rcv_wnd;                /* receive window */
+       tcp_seq rcv_nxt;                /* receive next */
+       tcp_seq rcv_up;                 /* receive urgent pointer */
+       tcp_seq irs;                    /* initial receive sequence number */
+/*
+ * Additional variables for this implementation.
+ */
+/* receive variables */
+       tcp_seq rcv_adv;                /* advertised window */
+/* retransmit variables */
+       tcp_seq snd_max;                /* highest sequence number sent
+                                          used to recognize retransmits */
+/* transmit timing stuff */
+       short   t_idle;                 /* inactivity time */
+       short   t_rtt;                  /* round trip time */
+       tcp_seq t_rtseq;                /* sequence number being timed */
+       float   t_srtt;                 /* smoothed round-trip time */
+/* out-of-band data */
+       char    t_oobflags;             /* have some */
+       char    t_iobc;                 /* input character */
+#define        TCPOOB_HAVEDATA 0x01
+};
+
+#define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
+#define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
+
+struct tcpstat {
+       int     tcps_badsum;
+       int     tcps_badoff;
+       int     tcps_hdrops;
+       int     tcps_badsegs;
+       int     tcps_unack;
+};
+
+#ifdef KERNEL
+struct inpcb tcb;              /* head of queue of active tcpcb's */
+struct tcpstat tcpstat;        /* tcp statistics */
+struct tcpiphdr *tcp_template();
+struct tcpcb *tcp_close(), *tcp_drop();
+struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
+#endif