+extern void subnet_update(struct node_t *, subnet_t *, bool);
+extern int maskcmp(const void *, const void *, int);
+extern void maskcpy(void *, const void *, int, int);
+extern void mask(void *, int, int);
+extern bool maskcheck(const void *, int, int);
+extern bool net2str(char *, int, const subnet_t *);
+extern bool str2net(subnet_t *, const char *);