defrouter_lookup_locked
dr = defrouter_lookup_locked(&ln->r_l3addr.addr6, ifp);
struct nd_defrouter *defrouter_lookup_locked(const struct in6_addr *,
dr = defrouter_lookup_locked(&new->rtaddr, new->ifp);
dr = defrouter_lookup_locked(addr, ifp);
dr = defrouter_lookup_locked(addr, ifp);