Add support for IP range drop and make features more modular.

src/xdp/utils/rl.c

@@ -1,5 +1,6 @@
 #include <xdp/utils/rl.h>
 
+#ifdef ENABLE_FILTERS
 /**
  * Updates IPv4 client stats.
  * 
@@ -128,4 +129,5 @@ static __always_inline void UpdateIp6Stats(u64 *pps, u64 *bps, u128 *ip, u16 por
         bpf_map_update_elem(&map_ip6_stats, ip, &new, BPF_ANY);
 #endif
     }
-}
+}
+#endif