net: ipv4: export fib_lookup and fib_table_lookup

The reverse path filter module will use fib_lookup.

If CONFIG_IP_MULTIPLE_TABLES is not set, fib_lookup is
only a static inline helper that calls fib_table_lookup,
so export that too.

Signed-off-by: Florian Westphal <[e-mail]>
Acked-by: David S. Miller <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/ipv4/fib_rules.c

···
 
 	return err;
 }
+EXPORT_SYMBOL_GPL(fib_lookup);
 
 static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
 			    int flags, struct fib_lookup_arg *arg)

net/ipv4/fib_trie.c

···
 	rcu_read_unlock();
 	return ret;
 }
+EXPORT_SYMBOL_GPL(fib_table_lookup);
 
 /*
  * Remove the leaf and return parent.