extern bool net2str(char *, int, const subnet_t *);
extern bool str2net(subnet_t *, const char *);
extern subnet_t *lookup_subnet(const struct node_t *, const subnet_t *);
extern bool net2str(char *, int, const subnet_t *);
extern bool str2net(subnet_t *, const char *);
extern subnet_t *lookup_subnet(const struct node_t *, const subnet_t *);