extern int in_ifadown(struct ifaddr *ifa, int);
extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
extern u_int32_t inaddr_hashval(u_int32_t);
extern int in_ifadown(struct ifaddr *ifa, int);
extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
extern u_int32_t inaddr_hashval(u_int32_t);