X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fin-addr-util.c;h=457eedd6d81825f519984f06884cc0c91ab4c6c0;hb=56dec05d29098b151421625c68525c2c3961e574;hp=e9a99177fcaf424923827db9074a06ad38820555;hpb=623a4c97b9175f95c4b1c6fc34e36c56f1e4ddbf;p=elogind.git

diff --git a/src/shared/in-addr-util.c b/src/shared/in-addr-util.c
index e9a99177f..457eedd6d 100644
--- a/src/shared/in-addr-util.c
+++ b/src/shared/in-addr-util.c
@@ -23,7 +23,7 @@
 
 #include "in-addr-util.h"
 
-int in_addr_null(int family, const union in_addr_union *u) {
+int in_addr_is_null(int family, const union in_addr_union *u) {
         assert(u);
 
         if (family == AF_INET)
@@ -39,6 +39,17 @@ int in_addr_null(int family, const union in_addr_union *u) {
         return -EAFNOSUPPORT;
 }
 
+int in_addr_is_link_local(int family, const union in_addr_union *u) {
+        assert(u);
+
+        if (family == AF_INET)
+                return (be32toh(u->in.s_addr) & 0xFFFF0000) == (169U << 24 | 254U << 16);
+
+        if (family == AF_INET6)
+                return IN6_IS_ADDR_LINKLOCAL(&u->in6);
+
+        return -EAFNOSUPPORT;
+}
 
 int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b) {
         assert(a);
@@ -231,3 +242,9 @@ int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *re
 
         return -EINVAL;
 }
+
+unsigned in_addr_netmask_to_prefixlen(const struct in_addr *addr) {
+        assert(addr);
+
+        return 32 - u32ctz(be32toh(addr->s_addr));
+}