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/****************************************************************************
**
** File: tcp.h
**
** Author: Mike Borella
**
** Comments: Generic TCP header structure - an attempt at OS independence
**
** $Id: tcp.h,v 1.6 2000/08/30 20:23:04 mborella Exp $
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Library General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
*****************************************************************************/
#ifndef TCP_H
#define TCP_H
#include "global.h"
#include "local.h"
/*
* TCP flags
*/
#define TCP_FLAG_FIN 0x01
#define TCP_FLAG_SYN 0x02
#define TCP_FLAG_RST 0x04
#define TCP_FLAG_PSH 0x08
#define TCP_FLAG_ACK 0x10
#define TCP_FLAG_URG 0x20
/*
* TCP options
*/
#define TCP_OPTION_EOL 0
#define TCP_OPTION_NOP 1
#define TCP_OPTION_MSS 2
#define TCP_OPTION_WS 3
#define TCP_OPTION_SACKOK 4
#define TCP_OPTION_SACK 5
#define TCP_OPTION_TS 8
/*
* TCP header
*/
typedef struct tcp_header
{
u_int16_t src; /* source port */
u_int16_t dst; /* destination port */
u_int32_t seq_number; /* sequence number */
u_int32_t ack_number; /* acknowledgement number */
#ifdef WORDS_BIGENDIAN
u_int8_t header_length:4, /* data offset */
unused:4; /* (unused) */
#else
u_int8_t unused:4, /* (unused) */
header_length:4; /* data offset */
#endif
u_int8_t flags;
u_int16_t window; /* window */
u_int16_t checksum; /* checksum */
u_int16_t urgent; /* urgent pointer */
} tcp_header_t;
void dump_tcp(packet_t *);
#endif
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