4 files changed, 39 insertions, 0 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index a7e60eb35e312..3e018a61f28d3 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -744,6 +744,11 @@ if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc)
 		/* Reliably crash if used uninitialized. */
 		ifp->if_broadcastaddr = NULL;
 
+		if (ifp->if_type == IFT_ETHER) {
+			ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR,
+			    M_WAITOK | M_ZERO);
+		}
+
 #if defined(INET) || defined(INET6)
 		/* Use defaults for TSO, if nothing is set */
 		if (ifp->if_hw_tsomax == 0 &&
@@ -1059,6 +1064,8 @@ if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp)
 		 * Remove link ifaddr pointer and maybe decrement if_index.
 		 * Clean up all addresses.
 		 */
+		free(ifp->if_hw_addr, M_IFADDR);
+		ifp->if_hw_addr = NULL;
 		ifp->if_addr = NULL;
 
 		/* We can now free link ifaddr. */
@@ -2667,6 +2674,10 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 		    ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
 		break;
 
+	case SIOCGHWADDR:
+		error = if_gethwaddr(ifp, ifr);
+		break;
+
 	case SIOCAIFGROUP:
 	{
 		struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
@@ -3584,6 +3595,29 @@ if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req)
 }
 
 /*
+ * Get the link layer address that was read from the hardware at attach.
+ *
+ * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type
+ * their component interfaces as IFT_IEEE8023ADLAG.
+ */
+int
+if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr)
+{
+
+	if (ifp->if_hw_addr == NULL)
+		return (ENODEV);
+
+	switch (ifp->if_type) {
+	case IFT_ETHER:
+	case IFT_IEEE8023ADLAG:
+		bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen);
+		return (0);
+	default:
+		return (ENODEV);
+	}
+}
+
+/*
  * The name argument must be a pointer to storage which will last as
  * long as the interface does.  For physical devices, the result of
  * device_get_name(dev) is a good choice and for pseudo-devices a
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 7956fcfa28ed0..738406be86cf3 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -916,6 +916,8 @@ ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
 	sdl->sdl_alen = ifp->if_addrlen;
 	bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
 
+	bcopy(lla, ifp->if_hw_addr, ifp->if_addrlen);
+
 	bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
 	if (ng_ether_attach_p != NULL)
 		(*ng_ether_attach_p)(ifp);
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index e5d5c76045859..d4d2ddceeff1b 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -281,6 +281,7 @@ struct ifnet {
 	struct	ifmultihead if_multiaddrs; /* multicast addresses configured */
 	int	if_amcount;		/* number of all-multicast requests */
 	struct	ifaddr	*if_addr;	/* pointer to link-level address */
+	void	*if_hw_addr;		/* hardware link-level address */
 	const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
 	struct	rwlock if_afdata_lock;
 	void	*if_afdata[AF_MAX];
@@ -650,6 +651,7 @@ int if_gethwassist(if_t ifp);
 int if_setsoftc(if_t ifp, void *softc);
 void *if_getsoftc(if_t ifp);
 int if_setflags(if_t ifp, int flags);
+int if_gethwaddr(if_t ifp, struct ifreq *);
 int if_setmtu(if_t ifp, int mtu);
 int if_getmtu(if_t ifp);
 int if_getmtu_family(if_t ifp, int family);
diff --git a/sys/sys/sockio.h b/sys/sys/sockio.h
index 5a3b482af17af..193560f64df7f 100644
--- a/sys/sys/sockio.h
+++ b/sys/sys/sockio.h
@@ -97,6 +97,7 @@
 #define	SIOCGIFSTATUS	_IOWR('i', 59, struct ifstat)	/* get IF status */
 #define	SIOCSIFLLADDR	 _IOW('i', 60, struct ifreq)	/* set linklevel addr */
 #define	SIOCGI2C	_IOWR('i', 61, struct ifreq)	/* get I2C data  */
+#define	SIOCGHWADDR	_IOWR('i', 62, struct ifreq)	/* get hardware lladdr */
 
 #define	SIOCSIFPHYADDR	 _IOW('i', 70, struct ifaliasreq) /* set gif address */
 #define	SIOCGIFPSRCADDR	_IOWR('i', 71, struct ifreq)	/* get gif psrc addr */