ipv4: export fib_flush

As nexthops are deleted, fib entries referencing it are marked dead.
Export fib_flush so those entries can be removed in a timely manner.
Signed-off-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -473,6 +473,7 @@ static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
 #endif
 }
 
+void fib_flush(struct net *net);
 void free_fib_info(struct fib_info *fi);
 
 static inline void fib_info_hold(struct fib_info *fi)

net/ipv4/fib_frontend.c

@@ -192,7 +192,7 @@ int fib_unmerge(struct net *net)
 	return 0;
 }
 
-static void fib_flush(struct net *net)
+void fib_flush(struct net *net)
 {
 	int flushed = 0;
 	unsigned int h;