--- /dev/null
+/*!\file netinet/tcp.h
+ * TCP header and options.
+ */
+
+/* $NetBSD: tcp.h,v 1.8 1995/04/17 05:32:58 cgd Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)tcp.h 8.1 (Berkeley) 6/10/93
+ */
+
+#ifndef __NETINET_TCP_H
+#define __NETINET_TCP_H
+
+typedef u_long tcp_seq;
+typedef u_long tcp_cc; /* connection count per rfc1644 */
+
+#include <sys/packon.h>
+
+
+/*
+ * TCP header.
+ * Per RFC 793, September, 1981.
+ */
+struct tcphdr {
+ u_short th_sport; /* source port */
+ u_short th_dport; /* destination port */
+ tcp_seq th_seq; /* sequence number */
+ tcp_seq th_ack; /* acknowledgement number */
+ u_char th_x2:4; /* (unused) */
+ u_char th_off:4; /* data offset */
+ u_char th_flags;
+#define TH_FIN 0x01
+#define TH_SYN 0x02
+#define TH_RST 0x04
+#define TH_PUSH 0x08
+#define TH_ACK 0x10
+#define TH_URG 0x20
+#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)
+
+ u_short th_win; /* window */
+ u_short th_sum; /* checksum */
+ u_short th_urp; /* urgent pointer */
+};
+
+#include <sys/packoff.h>
+
+#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
+#define TCPOLEN_SACK_PERMITTED 2
+#define TCPOPT_SACK 5
+#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)
+
+#define TCPOPT_CC 11 /* CC options: RFC-1644 */
+#define TCPOPT_CCNEW 12
+#define TCPOPT_CCECHO 13
+#define TCPOLEN_CC 6
+#define TCPOLEN_CC_APPA (TCPOLEN_CC+2)
+#define TCPOPT_CC_HDR(ccopt) \
+ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
+
+#define TCPOPT_SIGNATURE 19
+#define TCP_SIGLEN 16
+
+/*
+ * 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)).
+ */
+#define TCP_MSS 512
+
+#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
+#define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */
+
+#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
+
+#define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */
+#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
+ /* max space left for options */
+
+/*
+ * User-settable options (used with setsockopt).
+ */
+#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
+#define TCP_MAXSEG 0x02 /* set maximum segment size */
+#ifdef TCP_AUTO
+#define TCP_AUTO_OP 0x03 /* 0 to disable autotuning, 1 to reenable */
+#endif
+#define TCP_NOPUSH 0x04 /* don't push last block of write */
+#define TCP_NOOPT 0x08 /* don't use TCP options */
+
+/* For PSC modifications */
+#if defined(TCP_AUTO) || defined(TCP_SACK) || defined(TCP_FACK)
+#define PSC_VERSION "0.8"
+#endif
+
+#endif
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