/*
* 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. 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 REDIS_PORT
#define REDIS_PORT              6379
#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

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