static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
int *ret, struct net_device *orig_dev)
{
-#ifdef CONFIG_NETFILTER_INGRESS
if (nf_hook_ingress_active(skb)) {
int ingress_retval;
rcu_read_unlock();
return ingress_retval;
}
-#endif /* CONFIG_NETFILTER_INGRESS */
return 0;
}