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/****************************************************************************
** File: tcp.h
**
** Author: Mike Borella
**
** Comments: Generic TCP header structure - an attempt at OS independence
**
*****************************************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#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 TCPOPT_EOL 0
#define TCPOPT_NOP 1
#define TCPOPT_MAXSEG 2
/*
* TCP header
*/
typedef struct _TCPHdr
{
u_int16_t th_sport; /* source port */
u_int16_t th_dport; /* destination port */
u_int32_t th_seq; /* sequence number */
u_int32_t th_ack; /* acknowledgement number */
#ifdef WORDS_BIGENDIAN
u_int8_t th_off:4, /* data offset */
th_x2:4; /* (unused) */
#else
u_int8_t th_x2:4, /* (unused) */
th_off:4; /* data offset */
#endif
u_int8_t th_flags;
u_int16_t th_win; /* window */
u_int16_t th_sum; /* checksum */
u_int16_t th_urp; /* urgent pointer */
} TCPHdr;
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