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+/*
+ * 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
+ */
+
+/*
+ * TCP header.
+ * Per RFC 793, September, 1981.
+ */
+struct tcphdr {
+ nd_uint16_t th_sport; /* source port */
+ nd_uint16_t th_dport; /* destination port */
+ nd_uint32_t th_seq; /* sequence number */
+ nd_uint32_t th_ack; /* acknowledgement number */
+ nd_uint8_t th_offx2; /* data offset, rsvd */
+ nd_uint8_t th_flags;
+ nd_uint16_t th_win; /* window */
+ nd_uint16_t th_sum; /* checksum */
+ nd_uint16_t th_urp; /* urgent pointer */
+};
+
+#define TH_OFF(th) ((GET_U_1((th)->th_offx2) & 0xf0) >> 4)
+
+/* TCP 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_ECNECHO 0x40 /* ECN Echo */
+#define TH_CWR 0x80 /* ECN Cwnd Reduced */
+
+
+#define TCPOPT_EOL 0
+#define TCPOPT_NOP 1
+#define TCPOPT_MAXSEG 2
+#define TCPOLEN_MAXSEG 4
+#define TCPOPT_WSCALE 3 /* window scale factor (rfc1323) */
+#define TCPOPT_SACKOK 4 /* selective ack ok (rfc2018) */
+#define TCPOPT_SACK 5 /* selective ack (rfc2018) */
+#define TCPOPT_ECHO 6 /* echo (rfc1072) */
+#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
+#define TCPOPT_TIMESTAMP 8 /* timestamp (rfc1323) */
+#define TCPOLEN_TIMESTAMP 10
+#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
+#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_SIGNATURE 19 /* Keyed MD5 (rfc2385) */
+#define TCPOLEN_SIGNATURE 18
+#define TCP_SIGLEN 16 /* length of an option 19 digest */
+#define TCPOPT_SCPS 20 /* SCPS-TP (CCSDS 714.0-B-2) */
+#define TCPOPT_UTO 28 /* tcp user timeout (rfc5482) */
+#define TCPOLEN_UTO 4
+#define TCPOPT_TCPAO 29 /* TCP authentication option (rfc5925) */
+#define TCPOPT_MPTCP 30 /* MPTCP options */
+#define TCPOPT_FASTOPEN 34 /* TCP Fast Open (rfc7413) */
+#define TCPOPT_EXPERIMENT2 254 /* experimental headers (rfc4727) */
+
+#define TCPOPT_TSTAMP_HDR \
+ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
+
+#ifndef FTP_PORT
+#define FTP_PORT 21
+#endif
+#ifndef SSH_PORT
+#define SSH_PORT 22
+#endif
+#ifndef TELNET_PORT
+#define TELNET_PORT 23
+#endif
+#ifndef SMTP_PORT
+#define SMTP_PORT 25
+#endif
+#ifndef WHOIS_PORT
+#define WHOIS_PORT 43
+#endif
+#ifndef NAMESERVER_PORT
+#define NAMESERVER_PORT 53
+#endif
+#ifndef HTTP_PORT
+#define HTTP_PORT 80
+#endif
+#ifndef NETBIOS_SSN_PORT
+#define NETBIOS_SSN_PORT 139 /* RFC 1001, RFC 1002 */
+#endif
+#ifndef BGP_PORT
+#define BGP_PORT 179
+#endif
+#ifndef RPKI_RTR_PORT
+#define RPKI_RTR_PORT 323
+#endif
+#ifndef SMB_PORT
+#define SMB_PORT 445
+#endif
+#ifndef RTSP_PORT
+#define RTSP_PORT 554
+#endif
+#ifndef MSDP_PORT
+#define MSDP_PORT 639
+#endif
+#ifndef LDP_PORT
+#define LDP_PORT 646
+#endif
+#ifndef PPTP_PORT
+#define PPTP_PORT 1723
+#endif
+#ifndef NFS_PORT
+#define NFS_PORT 2049
+#endif
+#ifndef OPENFLOW_PORT_OLD
+#define OPENFLOW_PORT_OLD 6633
+#endif
+#ifndef OPENFLOW_PORT_IANA
+#define OPENFLOW_PORT_IANA 6653
+#endif
+#ifndef HTTP_PORT_ALT
+#define HTTP_PORT_ALT 8080
+#endif
+#ifndef RTSP_PORT_ALT
+#define RTSP_PORT_ALT 8554
+#endif
+#ifndef BEEP_PORT
+#define BEEP_PORT 10288
+#endif
+#ifndef REDIS_PORT
+#define REDIS_PORT 6379
+#endif