www.pudn.com > tdi_fw.rar > net.h, change:2009-04-28,size:1846b

// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil -*- (for GNU Emacs) 
// 
// $Id: net.h,v 1.1 2009/04/28 12:53:28 tanwen Exp $ 
 
#ifndef _net_h_ 
#define _net_h_ 
 
/* 
 * network definitions 
 */ 
 
#pragma pack(1) 
 
struct ether_hdr { 
	UCHAR	ether_dhost[6]; 
	UCHAR	ether_shost[6]; 
	USHORT	ether_type; 
}; 
 
#define	ETHERTYPE_IP		0x0800	/* IP protocol */ 
 
#define	IP_DF 0x4000			/* dont fragment flag */ 
#define	IP_MF 0x2000			/* more fragments flag */ 
#define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */ 
 
struct ip_hdr { 
	UCHAR	ip_hl:4;	/* header length */ 
	UCHAR	ip_v:4;		/* version */ 
	UCHAR	ip_tos;		/* type of service */ 
	USHORT	ip_len;		/* total length */ 
	USHORT	ip_id;		/* identification */ 
	USHORT	ip_off;		/* fragment offset field */ 
	UCHAR	ip_ttl;		/* time to live */ 
	UCHAR	ip_p;		/* protocol */ 
	USHORT	ip_sum;		/* checksum */ 
	ULONG	ip_src;		/* source address */ 
	ULONG	ip_dst;		/* dest address */ 
}; 
 
struct icmp_hdr { 
	UCHAR	icmp_type;		/* type of message */ 
	UCHAR	icmp_code;		/* type sub code */ 
	USHORT	icmp_cksum;		/* ones complement cksum of struct */ 
}; 
 
struct udp_hdr { 
	USHORT	uh_sport;		/* source port */ 
	USHORT	uh_dport;		/* destination port */ 
	USHORT	uh_ulen;		/* udp length */ 
	USHORT	uh_sum;			/* udp checksum */ 
}; 
 
#define	TH_FIN	0x01 
#define	TH_SYN	0x02 
#define	TH_RST	0x04 
#define	TH_PUSH	0x08 
#define	TH_ACK	0x10 
#define	TH_URG	0x20 
 
struct tcp_hdr { 
	USHORT	th_sport;		/* source port */ 
	USHORT	th_dport;		/* destination port */ 
	ULONG	th_seq;			/* sequence number */ 
	ULONG	th_ack;			/* acknowledgement number */ 
 
	UCHAR	th_x2:4;		/* (unused) */ 
	UCHAR	th_off:4;		/* data offset */ 
	UCHAR	th_flags; 
 
	USHORT	th_win;			/* window */ 
	USHORT	th_sum;			/* checksum */ 
	USHORT	th_urp;			/* urgent pointer */ 
}; 
 
#pragma pack() 
 
#endif