CANP_RECEIVE_OWN
(canp->canp_flags & CANP_RECEIVE_OWN) == 0) {
optval = (canp->canp_flags & CANP_RECEIVE_OWN) ? 1 : 0;
canp->canp_flags |= CANP_RECEIVE_OWN;
canp->canp_flags &= ~CANP_RECEIVE_OWN;