diff --git a/sys/sys/socket.h b/sys/sys/socket.h
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -264,6 +264,7 @@
 #define	AF_ARP		35
 #define	AF_BLUETOOTH	36		/* Bluetooth sockets */
 #define	AF_IEEE80211	37		/* IEEE 802.11 protocol */
+#define	AF_NETLINK	38		/* Netlink protocol */
 #define	AF_INET_SDP	40		/* OFED Socket Direct Protocol ipv4 */
 #define	AF_INET6_SDP	42		/* OFED Socket Direct Protocol ipv6 */
 #define	AF_HYPERV	43		/* HyperV sockets */
@@ -389,6 +390,7 @@
 #define	PF_ARP		AF_ARP
 #define	PF_BLUETOOTH	AF_BLUETOOTH
 #define	PF_IEEE80211	AF_IEEE80211
+#define	PF_NETLINK	AF_NETLINK
 #define	PF_INET_SDP	AF_INET_SDP
 #define	PF_INET6_SDP	AF_INET6_SDP