patches/dev.c.patch

diff --git a/net/core/dev.c b/net/core/dev.c
index d23742f..1f0415f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3168,6 +3168,9 @@ void netdev_rx_handler_unregister(struct net_device *dev)
 }
 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
 
+int (*athrs_fast_nat_recv)(struct sk_buff *skb) __rcu __read_mostly;
+EXPORT_SYMBOL_GPL(athrs_fast_nat_recv);
+
 static int __netif_receive_skb(struct sk_buff *skb)
 {
 	struct packet_type *ptype, *pt_prev;
@@ -3177,6 +3180,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
 	bool deliver_exact = false;
 	int ret = NET_RX_DROP;
 	__be16 type;
+	int (*fast_recv)(struct sk_buff *skb);
 
 	net_timestamp_check(!netdev_tstamp_prequeue, skb);
 
@@ -3194,10 +3198,18 @@ static int __netif_receive_skb(struct sk_buff *skb)
 	skb_reset_transport_header(skb);
 	skb_reset_mac_len(skb);
 
-	pt_prev = NULL;
-
 	rcu_read_lock();
 
+	fast_recv = rcu_dereference(athrs_fast_nat_recv);
+	if (fast_recv) {
+		if (fast_recv(skb)) {
+			rcu_read_unlock();
+			return NET_RX_SUCCESS;
+		}
+	}
+
+	pt_prev = NULL;
+
 another_round:
 
 	__this_cpu_inc(softnet_data.processed);