X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/0880b18ef40ee52f08a23527900e6354275bcc33..a2cdf9f6b08eceef2637b965669f0e87065b27fb:/usr/src/sys/netinet/tcp.h

diff --git a/usr/src/sys/netinet/tcp.h b/usr/src/sys/netinet/tcp.h
index 922c906b4f..b945f85de9 100644
--- a/usr/src/sys/netinet/tcp.h
+++ b/usr/src/sys/netinet/tcp.h
@@ -1,10 +1,26 @@
 /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1982, 1986, 1993
+ *	The Regents of the University of California.  All rights reserved.
  *
- *	@(#)tcp.h	7.1 (Berkeley) %G%
+ * %sccs.include.redist.c%
+ *
+ *	@(#)tcp.h	8.1 (Berkeley) %G%
+ */
+#ifndef BYTE_ORDER
+/*
+ * Definitions for byte order,
+ * according to byte significance from low address to high.
  */
+#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax) */
+#define	BIG_ENDIAN	4321	/* most-significant byte first (IBM, net) */
+#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp) */
+
+#ifdef vax
+#define	BYTE_ORDER	LITTLE_ENDIAN
+#else
+#define	BYTE_ORDER	BIG_ENDIAN	/* mc68000, tahoe, most others */
+#endif
+#endif BYTE_ORDER
 
 typedef	u_long	tcp_seq;
 /*
@@ -16,9 +32,13 @@ struct tcphdr {
 	u_short	th_dport;		/* destination port */
 	tcp_seq	th_seq;			/* sequence number */
 	tcp_seq	th_ack;			/* acknowledgement number */
-#ifdef vax
+#if BYTE_ORDER == LITTLE_ENDIAN
 	u_char	th_x2:4,		/* (unused) */
 		th_off:4;		/* data offset */
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+	u_char	th_off:4,		/* data offset */
+		th_x2:4;		/* (unused) */
 #endif
 	u_char	th_flags;
 #define	TH_FIN	0x01
@@ -32,20 +52,33 @@ struct tcphdr {
 	u_short	th_urp;			/* urgent pointer */
 };
 
-#define	TCPOPT_EOL	0
-#define	TCPOPT_NOP	1
-#define	TCPOPT_MAXSEG	2
+#define	TCPOPT_EOL		0
+#define	TCPOPT_NOP		1
+#define	TCPOPT_MAXSEG		2
+#define    TCPOLEN_MAXSEG		4
+#define TCPOPT_WINDOW		3
+#define    TCPOLEN_WINDOW		3
+#define TCPOPT_SACK_PERMITTED	4		/* Experimental */
+#define    TCPOLEN_SACK_PERMITTED	2
+#define TCPOPT_SACK		5		/* Experimental */
+#define TCPOPT_TIMESTAMP	8
+#define    TCPOLEN_TIMESTAMP		10
+#define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
+
+#define TCPOPT_TSTAMP_HDR	\
+    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 
 /*
  * Default maximum segment size for TCP.
  * With an IP MSS of 576, this is 536,
  * but 512 is probably more convenient.
+ * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
  */
-#ifdef	lint
-#define	TCP_MSS	536
-#else
-#define	TCP_MSS	MIN(512, IP_MSS - sizeof (struct tcpiphdr))
-#endif
+#define	TCP_MSS	512
+
+#define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */
+
+#define TCP_MAX_WINSHIFT	14	/* maximum window shift */
 
 /*
  * User-settable options (used with setsockopt).