X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/2434e4620a86ec33649e4d90bcb740c56640b405..423e92eee4fa5c99e5bdf44c0dd420d9d50ec2d8:/usr/src/sys/netinet/tcp_fsm.h

diff --git a/usr/src/sys/netinet/tcp_fsm.h b/usr/src/sys/netinet/tcp_fsm.h
index 20db16b890..4f2ce911c1 100644
--- a/usr/src/sys/netinet/tcp_fsm.h
+++ b/usr/src/sys/netinet/tcp_fsm.h
@@ -1,73 +1,52 @@
-/*	tcp_fsm.h	4.4	81/11/08	*/
+/*	tcp_fsm.h	4.12	81/12/21	*/
 
 /*
- * TCP FSM definitions.
- *
- * The TCP is conceptually a finite state machine with 13 states
- * and 9 inputs.  The states and inputs are defined here, as well
- * as an array which is used in network profiling to keep event
- * counters on the state transitions.  The actual state transitions
- * occur on input to the tcp machine (tcp_input.c) and when user
- * requests are made (tcp_states.c).
- *
- * This TCP machine has two more states than suggested in RFC 793,
- * the extra states being L_SYN_RCVD and RCV_WAIT.
- *
- * EXPLAIN THE EXTRA STATES!!!
+ * TCP FSM state definitions.
+ * Per RFC793, September, 1981.
  */
 
-/*
- * States
- */
-#define	TCP_NSTATES	14
+#define	TCP_NSTATES	11
 
-#define	EFAILEC		-1		/* new state for failure, internally */
-#define	SAME		0		/* no state change, internally */
-#define	LISTEN		1		/* listening for connection */
-#define	SYN_SENT	2		/* active, have sent syn */
-#define	SYN_RCVD	3
-#define	L_SYN_RCVD	4
-#define	ESTAB		5		/* established */
-#define	FIN_W1		6		/* have closed and sent fin */
-#define	FIN_W2		7		/* have closed and rcvd ack of fin */
-#define	TIME_WAIT	8		/* in 2*msl quiet wait after close */
-#define	CLOSE_WAIT	9		/* rcvd fin, waiting for UCLOSE */
-#define	CLOSING		10		/* closed xchd FIN; await FIN ACK */
-#define	LAST_ACK	11		/* had fin and UCLOSE; await FIN ACK */
-#define	RCV_WAIT	12		/* waiting for user to drain data */
-#define	CLOSED		13		/* closed */
+#define	TCPS_CLOSED		0	/* closed */
+#define	TCPS_LISTEN		1	/* listening for connection */
+#define	TCPS_SYN_SENT		2	/* active, have sent syn */
+#define	TCPS_SYN_RECEIVED	3	/* have send and received syn */
+/* states < TCPS_ESTABLISHED are those where connections not established */
+#define	TCPS_ESTABLISHED	4	/* established */
+#define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */
+/* states > TCPS_CLOSE_WAIT are those where user has closed */
+#define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */
+#define	TCPS_CLOSING		7	/* closed xchd FIN; await FIN ACK */
+#define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */
+/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
+#define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */
+#define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */
 
+#define	TCPS_HAVERCVDSYN(s)	((s) >= TCPS_SYN_RECEIVED)
+#define	TCPS_HAVERCVDFIN(s)	((s) >= TCPS_TIME_WAIT)
+
+#ifdef	TCPOUTFLAGS
 /*
- * Inputs to fsm.
+ * Flags used when sending segments in tcp_output.
+ * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
+ * determined by state, with the proviso that TH_FIN is sent only
+ * if all data queued for output is included in the segment.
  */
-#define	TCP_NINPUTS	10
-
-#define	IUOPENA 	0		/* active open by user */
-#define	INRECV		1		/* segment received from net */
-#define	IUOPENR		2		/* passive open by user */
-#define	IUCLOSE		3		/* close by user */
-#define	ISTIMER		4		/* tcp timer expired */
-#define	IURECV		5		/* user read data; adjust window */
-#define	IUSEND		6		/* user sending data */
-#define	IUABORT		7		/* user aborts connection */
-#define	INCLEAR		8		/* network clear */
-#define	INSEND		9		/* send by tcp to remote peer */
+u_char	tcp_outflags[TCP_NSTATES] = {
+    TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
+    TH_ACK, TH_ACK,
+    TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
+};
+#endif
 
 #ifdef KPROF
-int	acounts[TCP_NSTATES][TCP_NINPUTS];
+int	tcp_acounts[TCP_NSTATES][PRU_NREQ];
 #endif
 
-#ifdef TCPSTATES
+#ifdef	TCPSTATES
 char *tcpstates[] = {
-	"SAME",		"LISTEN",	"SYN_SENT",	"SYN_RCVD",
-	"L_SYN_RCVD",	"ESTAB",	"FIN_W1",	"FIN_W2",
-	"TIME_WAIT",	"CLOSE_WAIT",	"CLOSING",	"LAST_ACK",
-	"RCV_WAIT",	"CLOSED"
-};
-char *tcpinputs[] = {
-	"BAD",		"UOPENA",	"NRECV",	"UOPENR",
-	"UCLOSE",	"STIMER",	"URECV",	"USEND",
-	"UABORT",	"NCLEAR",	"NSEND",
+	"CLOSED",	"LISTEN",	"SYN_SENT",	"SYN_RCVD",
+	"ESTABLISHED",	"CLOSE_WAIT",	"FIN_WAIT_1",	"CLOSING",
+	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",
 };
-char *tcptimers[] = { "INIT", "REXMT", "REXMTTL", "PERSIST", "FINACK" };
 #endif