/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		Definitions for the TCP protocol. * * Version:	@(#)tcp.h	1.0.2	04/28/93 * * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * *		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. */#ifndef _LINUX_TCP_H#define _LINUX_TCP_H#define HEADER_SIZE	64		/* maximum header size		*/struct tcphdr {  unsigned short	source;  unsigned short	dest;  unsigned long		seq;  unsigned long		ack_seq;  unsigned short	res1:4,			doff:4,			fin:1,			syn:1,			rst:1,			psh:1,			ack:1,			urg:1,			res2:2;  unsigned short	window;  unsigned short	check;  unsigned short	urg_ptr;};enum {  TCP_ESTABLISHED = 1,  TCP_SYN_SENT,  TCP_SYN_RECV,#if 0  TCP_CLOSING, /* not a valid state, just a seperator so we can use		  < tcp_closing or > tcp_closing for checks. */#endif  TCP_FIN_WAIT1,  TCP_FIN_WAIT2,  TCP_TIME_WAIT,  TCP_CLOSE,  TCP_CLOSE_WAIT,  TCP_LAST_ACK,  TCP_LISTEN};#endif	/* _LINUX_TCP_H */