IFBIF_LOCKED
bridge_ifsetflag(val, IFBIF_LOCKED);
bridge_ifclrflag(val, IFBIF_LOCKED);
if (ISSET(bif_flags, IFBIF_LOCKED)) {
if (ISSET(ifbr->ifbr_ifsflags, IFBIF_LOCKED) &&
(IFBIF_PVLAN_PTAGS|IFBIF_LOCKED|IFBIF_LEARNING|IFBIF_DISCOVER|IFBIF_BLOCKNONIP)