diff --git a/sys/net/if.c b/sys/net/if.c
index 712cd13..e6b8e82 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -2055,6 +2055,11 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 		ifr->ifr_curcap = ifp->if_capenable;
 		break;
 
+	case SIOCGIFDATA:
+		error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data,
+		    sizeof(ifp->if_data));
+		break;
+
 #ifdef MAC
 	case SIOCGIFMAC:
 		error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
diff --git a/sys/sys/sockio.h b/sys/sys/sockio.h
index df0d4b2..87094a0 100644
--- a/sys/sys/sockio.h
+++ b/sys/sys/sockio.h
@@ -113,6 +113,8 @@
 #define	SIOCGIFFIB	_IOWR('i', 92, struct ifreq)	/* get IF fib */
 #define	SIOCSIFFIB	 _IOW('i', 93, struct ifreq)	/* set IF fib */
 
+#define	SIOCGIFDATA	_IOWR('i', 94, struct ifreq)	/* get if_data */
+
 #define	SIOCSDRVSPEC	_IOW('i', 123, struct ifdrv)	/* set driver-specific
 								  parameters */
 #define	SIOCGDRVSPEC	_IOWR('i', 123, struct ifdrv)	/* get driver-specific