1 files changed, 52 insertions, 15 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 94622e5fb936..4cda69b6b28c 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -865,6 +865,52 @@ static struct proto tun_proto = {
         .obj_size       = sizeof(struct tun_sock),
 };
 
+static int tun_flags(struct tun_struct *tun)
+{
+        int flags = 0;
+
+        if (tun->flags & TUN_TUN_DEV)
+                flags |= IFF_TUN;
+        else
+                flags |= IFF_TAP;
+
+        if (tun->flags & TUN_NO_PI)
+                flags |= IFF_NO_PI;
+
+        if (tun->flags & TUN_ONE_QUEUE)
+                flags |= IFF_ONE_QUEUE;
+
+        if (tun->flags & TUN_VNET_HDR)
+                flags |= IFF_VNET_HDR;
+
+        return flags;
+}
+
+static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
+                              char *buf)
+{
+        struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+        return sprintf(buf, "0x%x\n", tun_flags(tun));
+}
+
+static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
+                              char *buf)
+{
+        struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+        return sprintf(buf, "%d\n", tun->owner);
+}
+
+static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
+                              char *buf)
+{
+        struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+        return sprintf(buf, "%d\n", tun->group);
+}
+
+static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
+static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
+static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
+
 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 {
         struct sock *sk;
@@ -950,6 +996,11 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                 if (err < 0)
                         goto err_free_sk;
 
+                if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
+                    device_create_file(&tun->dev->dev, &dev_attr_owner) ||
+                    device_create_file(&tun->dev->dev, &dev_attr_group))
+                        printk(KERN_ERR "Failed to create tun sysfs files\n");
+
                 sk->sk_destruct = tun_sock_destruct;
 
                 err = tun_attach(tun, file);
@@ -1002,21 +1053,7 @@ static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
 
         strcpy(ifr->ifr_name, tun->dev->name);
 
-        ifr->ifr_flags = 0;
-
-        if (ifr->ifr_flags & TUN_TUN_DEV)
-                ifr->ifr_flags |= IFF_TUN;
-        else
-                ifr->ifr_flags |= IFF_TAP;
-
-        if (tun->flags & TUN_NO_PI)
-                ifr->ifr_flags |= IFF_NO_PI;
-
-        if (tun->flags & TUN_ONE_QUEUE)
-                ifr->ifr_flags |= IFF_ONE_QUEUE;
-
-        if (tun->flags & TUN_VNET_HDR)
-                ifr->ifr_flags |= IFF_VNET_HDR;
+        ifr->ifr_flags = tun_flags(tun);
 
         tun_put(tun);
         return 0;