-/* tcp_var.h 4.11 81/12/02 */
+/*
+ * Copyright (c) 1982 Regents of the University of California.
+ * All rights reserved. The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ * @(#)tcp_var.h 6.6 (Berkeley) %G%
+ */
/*
* Kernel variables for tcp.
struct tcpcb {
struct tcpiphdr *seg_next; /* sequencing queue */
struct tcpiphdr *seg_prev;
- int t_state; /* state of this connection */
+ 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 */
- short t_force; /* 1 if forcing out a byte */
+ 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_PUSH 0x04 /* push mode */
-#define TF_URG 0x08 /* urgent mode */
-#define TF_DONTKEEP 0x10 /* don't use keep-alives */
+#define TF_ACKNOW 0x01 /* ack peer immediately */
+#define TF_DELACK 0x02 /* ack, but try to delay it */
+#define TF_NODELAY 0x04 /* don't delay packets to coalesce */
+#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 */
/*
/* send sequence variables */
tcp_seq snd_una; /* send unacknowledged */
tcp_seq snd_nxt; /* send next */
- u_short snd_wnd; /* send window */
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 */
- tcp_seq rcv_nxt; /* receive next */
u_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 */
/*
tcp_seq rcv_adv; /* advertised window */
/* retransmit variables */
tcp_seq snd_max; /* highest sequence number sent
- used to recognize retransmits */
+ * used to recognize retransmits
+ */
+/* congestion control (for source quench) */
+ u_short snd_cwnd; /* congestion-controlled window */
/* transmit timing stuff */
short t_idle; /* inactivity time */
short t_rtt; /* round trip time */
+ u_short max_rcvd; /* most peer has sent into window */
tcp_seq t_rtseq; /* sequence number being timed */
float t_srtt; /* smoothed round-trip time */
+ u_short max_sndwnd; /* largest window peer has offered */
+/* out-of-band data */
+ char t_oobflags; /* have some */
+ char t_iobc; /* input character */
+#define TCPOOB_HAVEDATA 0x01
+#define TCPOOB_HADDATA 0x02
};
#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
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