net: change the type of ip_route_input_rcu to static

The type of ip_route_input_rcu should be static.
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20220711073549.8947-1-shaozhengchao@huawei.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

include/net/route.h

@@ -201,10 +201,6 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 			  struct in_device *in_dev, u32 *itag);
 int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
 			 u8 tos, struct net_device *devin);
-int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
-		       u8 tos, struct net_device *devin,
-		       struct fib_result *res);
-
 int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
 		      u8 tos, struct net_device *devin,
 		      const struct sk_buff *hint);

net/ipv4/route.c

@@ -2439,24 +2439,9 @@ out:	return err;
 	goto out;
 }
 
-int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr,
-			 u8 tos, struct net_device *dev)
-{
-	struct fib_result res;
-	int err;
-
-	tos &= IPTOS_RT_MASK;
-	rcu_read_lock();
-	err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res);
-	rcu_read_unlock();
-
-	return err;
-}
-EXPORT_SYMBOL(ip_route_input_noref);
-
 /* called with rcu_read_lock held */
-int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
-		       u8 tos, struct net_device *dev, struct fib_result *res)
+static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+			      u8 tos, struct net_device *dev, struct fib_result *res)
 {
 	/* Multicast recognition logic is moved from route cache to here.
 	 * The problem was that too many Ethernet cards have broken/missing
@@ -2505,6 +2490,21 @@ int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	return ip_route_input_slow(skb, daddr, saddr, tos, dev, res);
 }
 
+int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+			 u8 tos, struct net_device *dev)
+{
+	struct fib_result res;
+	int err;
+
+	tos &= IPTOS_RT_MASK;
+	rcu_read_lock();
+	err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res);
+	rcu_read_unlock();
+
+	return err;
+}
+EXPORT_SYMBOL(ip_route_input_noref);
+
 /* called with rcu_read_lock() */
 static struct rtable *__mkroute_output(const struct fib_result *res,
 				       const struct flowi4 *fl4, int orig_oif,