in6_lookup_multi
in6m_sol = in6_lookup_multi(&llsol, ifp);
in6_lookup_multi(const struct in6_addr *, const struct ifnet *);
in6m = in6_lookup_multi(&mld_addr, ifp);
in6m = in6_lookup_multi(maddr6, ifp);
if (in6_lookup_multi(&in6m->in6m_addr, in6m->in6m_ifp) != NULL)
in6m = in6_lookup_multi(addr, ifp);
ingroup = in6_lookup_multi(addr, ifp) != NULL;