#ifndef __UDP_H#define __UDP_H#define TFTP 0x45/* *	This structure defines an udp header. */__packed struct udphdr {	unsigned short	source;	unsigned short	dest;	unsigned short	len;	unsigned short	check;};//__attribute__ ((packed));int udp_init(void);int udp_rcv_packet(struct sk_buff *skb);int udp_send(struct sk_buff *skb, unsigned long ip,	unsigned short source, unsigned short dest);void udp_skb_reserve(struct sk_buff *skb);unsigned short udp_get_source_port(struct sk_buff *skb);#endif /* __UDP_H */