extern int maskcmp(const void *a, const void *b, int masklen);
extern void maskcpy(void *dest, const void *src, int masklen, int len);
extern void mask(void *mask, int masklen, int len);
+extern bool subnetcheck(const subnet_t subnet);
extern bool maskcheck(const void *mask, int masklen, int len);
extern bool net2str(char *netstr, int len, const subnet_t *subnet);
extern bool str2net(subnet_t *subnet, const char *netstr);