+/* tcp_var.h 4.1 81/11/08 */
+
+/*
+ * Kernel variables for tcp.
+ */
+
+/*
+ * Tcp control block.
+ */
+struct tcb {
+ struct tcb_hd {
+ struct th *seg_next,*seg_prev; /* seq queue */
+ struct tcb *tcb_next,*tcb_prev; /* other tcb's */
+ } tcb_hd;
+ struct th *t_template; /* skeletal packet for transmit */
+ struct socket *t_socket; /* back pointer to socket */
+ struct mbuf *seg_unack; /* unacked message queue */
+ struct host *t_host;
+ short seqcnt;
+ short xxx;
+ seq_t iss; /* initial send seq # */
+ seq_t irs; /* initial recv seq # */
+ seq_t rcv_urp; /* rcv urgent pointer */
+ seq_t rcv_nxt; /* next seq # to rcv */
+ seq_t rcv_end; /* rcv eol pointer */
+ seq_t snd_off; /* seq # of first datum in send buf */
+ seq_t seq_fin; /* seq # of FIN sent */
+ seq_t snd_end; /* send eol pointer */
+ seq_t snd_urp; /* snd urgent pointer */
+ seq_t snd_lst; /* seq # of last sent datum */
+ seq_t snd_nxt; /* seq # of next datum to send */
+ seq_t snd_una; /* seq # of first unacked datum */
+ seq_t snd_wl; /* seq # of last sent window */
+ seq_t snd_hi; /* highest seq # sent */
+ seq_t snd_wnd; /* send window max */
+ seq_t t_rexmt_val; /* val saved in rexmt timer */
+ seq_t t_rtl_val; /* val saved in rexmt too long timer */
+ seq_t t_xmt_val; /* seq # sent when xmt timer started */
+ seq_t rcv_adv; /* advertised window */
+ u_short tc_flags; /* flags and state; see below */
+ u_short t_options;
+#define TO_EOL 0x01 /* eol mode */
+#define TO_URG 0x02 /* urgent mode */
+ u_short t_lport; /* local port */
+ u_short t_fport; /* foreign port */
+ u_char t_state; /* state of this connection */
+ u_char t_xmtime; /* current rexmt time */
+/* timers... must be in order */
+ short t_init; /* initialization too long */
+ short t_rexmt; /* retransmission */
+ short t_rexmttl; /* retransmit too long */
+ short t_persist; /* retransmit persistance */
+ short t_finack; /* fin acknowledged */
+ short t_xmt; /* round trip transmission time */
+/* end timers */
+};
+
+/* tc_flags values */
+#define TC_ACK_DUE 0x0001 /* must we send ACK */
+#define TC_CANCELLED 0x0002 /* retransmit timer cancelled */
+#define TC_DROPPED_TXT 0x0004 /* dropped incoming data */
+#define TC_FIN_RCVD 0x0008 /* FIN received */
+#define TC_FORCE_ONE 0x0010 /* force sending of one byte */
+#define TC_NEW_WINDOW 0x0020 /* received new window size */
+#define TC_REXMT 0x0040 /* this msg is a retransmission */
+#define TC_SND_FIN 0x0080 /* FIN should be sent */
+#define TC_SND_RST 0x0100 /* RST should be sent */
+#define TC_SND_URG 0x0200 /* urgent data to send */
+#define TC_SYN_ACKED 0x0400 /* SYN has been ACKed */
+#define TC_SYN_RCVD 0x0800 /* SYN has been received */
+#define TC_USR_CLOSED 0x1000 /* user has closed connection */
+#define TC_WAITED_2_ML 0x2000 /* wait time for FIN ACK is up */
+#define TC_NET_KEEP 0x4000 /* don't free this net input */
+#define TC_USR_ABORT 0x8000 /* user has closed and does not expect
+ to receive any more data */
+/*
+ * TCP timers.
+ */
+#define TINIT 0
+#define TREXMT 1
+#define TREXMTTL 2
+#define TPERSIST 3
+#define TFINACK 4
+#define TNTIMERS 5
+
+/*
+ * Tcp machine predicates
+ */
+#define ack_ok(x, y) \
+ (((y)->th_flags&TH_ACK)==0 || \
+ ((x)->iss < (y)->t_ackno && (y)->t_ackno <= (x)->snd_hi))
+
+#define syn_ok(x, y) \
+ ((y)->th_flags&TH_SYN)
+
+#define ack_fin(x, y) \
+ ((x)->seq_fin > (x)->iss && (y)->t_ackno > (x)->seq_fin)
+
+#define rcv_empty(x) \
+ (((x)->tc_flags&TC_USR_ABORT) || \
+ ((x)->t_socket->so_rcv.sb_mb == NULL && \
+ (x)->tcb_hd.seg_next == (x)->tcb_hd.seg_prev))
+
+#define ISSINCR 128 /* increment for iss each second */
+#define TCPSIZE 20 /* size of TCP leader (bytes) */
+
+/*
+ * THESE NEED TO BE JUSTIFIED!
+ *
+ * *2 here is because slow timeout routine called every 1/2 second.
+ */
+#define T_2ML (10*2) /* 2*maximum packet lifetime */
+#define T_PERS (5*2) /* persist time */
+#define T_REXMT (1*2) /* base for retransmission time */
+#define T_REXMTTL (30*2) /* retransmit too long timeout */
+#define T_REMAX (30*2) /* maximum retransmission time */
+
+#ifdef TCPDEBUG
+#define TDBSIZE 50
+/*
+ * Tcp debugging record.
+ */
+struct tcp_debug {
+ long td_tod; /* time of day */
+ struct tcb *td_tcb; /* -> tcb */
+ char td_old; /* old state */
+ char td_inp; /* input */
+ char td_tim; /* timer id */
+ char td_new; /* new state */
+ seq_t td_sno; /* seq_t number */
+ seq_t td_ano; /* acknowledgement */
+ u_short td_wno; /* window */
+ u_short td_lno; /* length */
+ u_char td_flg; /* message flags */
+};
+#endif
+
+#ifdef KERNEL
+struct tcb_hd tcb; /* tcp tcb list head */
+seq_t tcp_iss; /* tcp initial send seq # */
+int tcpconsdebug; /* set to 1 traces on console */
+#ifdef TCPDEBUG
+struct tcp_debug tcp_debug[TDBSIZE];
+#endif
+int tdbx; /* rotating index into tcp_debug */
+struct th *tcp_template();
+#endif
+
+#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
+#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
+#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
+#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
+struct th *tcp_template();
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