extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
extern int arp_ioctl(unsigned int cmd, void __user *arg);
extern void arp_send(int type, int ptype, u32 dest_ip,
extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
extern int arp_ioctl(unsigned int cmd, void __user *arg);
extern void arp_send(int type, int ptype, u32 dest_ip,