extern void arp_ifdown(struct net_device *dev);
extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
extern void arp_ifdown(struct net_device *dev);
extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,