sd-netlink: add support for RTA_PREF

src/basic/missing.h

@@ -901,6 +901,10 @@ static inline int setns(int fd, int nstype) {
 #define NDA_MAX (__NDA_MAX - 1)
 #endif
 
+#ifndef RTA_PREF
+#define RTA_PREF 20
+#endif
+
 #ifndef IPV6_UNICAST_IF
 #define IPV6_UNICAST_IF 76
 #endif

src/libsystemd/sd-netlink/netlink-types.c

@@ -490,7 +490,11 @@ static const NLType rtnl_route_types[] = {
         RTA_TABLE,
         RTA_MARK,
         RTA_MFC_STATS,
+        RTA_VIA,
+        RTA_NEWDST,
 */
+        [RTA_PREF]              = { .type = NETLINK_TYPE_U8 },
+
 };
 
 static const NLTypeSystem rtnl_route_type_system = {