#ifndef __IP_H#define __IP_H#define UDP  0x11/* *	This structure defines an ip header. */struct iphdr {	unsigned char	ihl:4,			version:4;	unsigned char	tos;	unsigned short	tot_len;	unsigned short	id;	unsigned short	frag_off;	unsigned char	ttl;	unsigned char	protocol;	unsigned short	check;	unsigned long	saddr;	unsigned long	daddr;	/*The options start here. */}__attribute__ ((packed));int ip_init(unsigned long ip);int ip_rcv_packet(struct sk_buff *skb);int ip_send(struct sk_buff *skb, unsigned long ip, unsigned char proto);void ip_skb_reserve(struct sk_buff *skb);unsigned long ip_get_source_ip(struct sk_buff *skb);#endif /* __IP_H */