+extern bool ip_prefix_validate (const ip_prefix_t * ip);
+extern void ip4_address_normalize (ip4_address_t * ip4, u8 preflen);
+extern void ip6_address_normalize (ip6_address_t * ip6, u8 preflen);
+extern void ip4_preflen_to_mask (u8 pref_len, ip4_address_t * ip);
+extern u32 ip4_mask_to_preflen (ip4_address_t * mask);
+extern void ip4_prefix_max_address_host_order (ip4_address_t * ip, u8 plen,
+ ip4_address_t * res);
+extern void ip6_prefix_max_address_host_order (ip6_address_t * ip, u8 plen,
+ ip6_address_t * res);
+extern void ip6_preflen_to_mask (u8 pref_len, ip6_address_t * mask);
+extern u32 ip6_mask_to_preflen (ip6_address_t * mask);
+