-int in_addr_null(unsigned family, union in_addr_union *u);
-int in_addr_equal(unsigned family, union in_addr_union *a, union in_addr_union *b);
-int in_addr_prefix_intersect(unsigned family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
-int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen);
-int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret);
-int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret);
-int in_addr_from_string_auto(const char *s, unsigned *family, union in_addr_union *ret);
-
-static inline size_t PROTO_ADDRESS_SIZE(int proto) {
- assert(proto == AF_INET || proto == AF_INET6);
- return proto == AF_INET6 ? 16 : 4;
+int in_addr_is_null(int family, const union in_addr_union *u);
+int in_addr_is_link_local(int family, const union in_addr_union *u);
+int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b);
+int in_addr_prefix_intersect(int family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
+int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen);
+int in_addr_to_string(int family, const union in_addr_union *u, char **ret);
+int in_addr_from_string(int family, const char *s, union in_addr_union *ret);
+int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret);
+unsigned char in_addr_netmask_to_prefixlen(const struct in_addr *addr);
+struct in_addr* in_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen);
+int in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen);
+int in_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask);
+int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen);
+
+static inline size_t FAMILY_ADDRESS_SIZE(int family) {
+ assert(family == AF_INET || family == AF_INET6);
+ return family == AF_INET6 ? 16 : 4;