Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[linux-2.6-block.git] / net / batman-adv / hard-interface.c

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index fb2d9c058ed047255ab8a1fc605d1bcb9591d60a..e2aaa4cc39a7405c94c5c5f467b1c5f0591a0ddd 100644 (file)
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -83,6 +83,28 @@ out:
        return hard_iface;
 }
 
+/**
+ * batadv_mutual_parents - check if two devices are each others parent
+ * @dev1: 1st net_device
+ * @dev2: 2nd net_device
+ *
+ * veth devices come in pairs and each is the parent of the other!
+ *
+ * Return: true if the devices are each others parent, otherwise false
+ */
+static bool batadv_mutual_parents(const struct net_device *dev1,
+                                 const struct net_device *dev2)
+{
+       int dev1_parent_iflink = dev_get_iflink(dev1);
+       int dev2_parent_iflink = dev_get_iflink(dev2);
+
+       if (!dev1_parent_iflink || !dev2_parent_iflink)
+               return false;
+
+       return (dev1_parent_iflink == dev2->ifindex) &&
+              (dev2_parent_iflink == dev1->ifindex);
+}
+
 /**
  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
  * @net_dev: the device to check
@@ -116,6 +138,9 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
        if (WARN(!parent_dev, "Cannot find parent device"))
                return false;
 
+       if (batadv_mutual_parents(net_dev, parent_dev))
+               return false;
+
        ret = batadv_is_on_batman_iface(parent_dev);
 
        return ret;