if_findmulti
ifma = if_findmulti(ifp, &ifr->ifr_addr);
ifma = if_findmulti(ifp, sa);
ll_ifma = if_findmulti(ifp, llsa);
ifma = if_findmulti(ifp, sa);
if_findmulti(if_t, const struct sockaddr *);
ifma = if_findmulti(priv->ifp,