-int ip_address_cmp (ip_address_t * ip1, ip_address_t * ip2);
-void ip_address_copy (ip_address_t * dst, ip_address_t * src);
-void ip_address_copy_addr (void *dst, ip_address_t * src);
-void ip_address_set (ip_address_t * dst, void *src, u8 version);
+int ip_address_cmp (const ip_address_t * ip1, const ip_address_t * ip2);
+void ip_address_copy (ip_address_t * dst, const ip_address_t * src);
+void ip_address_copy_addr (void *dst, const ip_address_t * src);
+void ip_address_set (ip_address_t * dst, const void *src, u8 version);