tcp.h

LINUX1.0内核源代码,学习LINUX编程的一定要看。

/*
 * 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, <[e-mail]>
 *
 *		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 */