IPN_DELETE
n->in_flags |= IPN_DELETE;
in->in_flags |= IPN_DELETE;
if (ipn->in_use == 0 && (ipn->in_flags & IPN_DELETE)) {
n->in_flags |= IPN_DELETE;
if (in->in_use == 0 && (in->in_flags & IPN_DELETE)) {
#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)