3 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 3d7a6687d247..848480bc2bf9 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -127,6 +127,20 @@ static inline void random_ether_addr(u8 *addr)
 }
 
 /**
+ * dev_hw_addr_random - Create random MAC and set device flag
+ * @dev: pointer to net_device structure
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Generate random MAC to be used by a device and set addr_assign_type
+ * so the state can be read by sysfs and be used by udev.
+ */
+static inline void dev_hw_addr_random(struct net_device *dev, u8 *hwaddr)
+{
+        dev->addr_assign_type |= NET_ADDR_RANDOM;
+        random_ether_addr(hwaddr);
+}
+
+/**
  * compare_ether_addr - Compare two Ethernet addresses
  * @addr1: Pointer to a six-byte array containing the Ethernet address
  * @addr2: Pointer other six-byte array containing the Ethernet address
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b6262898ece0..1bca6171b1aa 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -66,6 +66,11 @@ struct wireless_dev;
 #define HAVE_FREE_NETDEV                /* free_netdev() */
 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
 
+/* hardware address assignment types */
+#define NET_ADDR_PERM           0       /* address is permanent (default) */
+#define NET_ADDR_RANDOM         1       /* address is generated randomly */
+#define NET_ADDR_STOLEN         2       /* address is stolen from other device */
+
 /* Backlog congestion levels */
 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 #define NET_RX_DROP             1       /* packet dropped */
@@ -919,6 +924,7 @@ struct net_device {
 
         /* Interface address info. */
         unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
+        unsigned char           addr_assign_type; /* hw address assignment type */
         unsigned char           addr_len;       /* hardware address length      */
         unsigned short          dev_id;         /* for shared network cards */
 
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index d2b596537d41..af4dfbadf2a0 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -95,6 +95,7 @@ static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
 }
 
 NETDEVICE_SHOW(dev_id, fmt_hex);
+NETDEVICE_SHOW(addr_assign_type, fmt_dec);
 NETDEVICE_SHOW(addr_len, fmt_dec);
 NETDEVICE_SHOW(iflink, fmt_dec);
 NETDEVICE_SHOW(ifindex, fmt_dec);
@@ -295,6 +296,7 @@ static ssize_t show_ifalias(struct device *dev,
 }
 
 static struct device_attribute net_class_attributes[] = {
+        __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),