batman-adv: prevent using any virtual device created on batman-adv as hard-interface

Any virtual device created on top of a batman-adv mesh interface must be
prevented to be used to create a new mesh network (this would lead to an
unwanted batman-over-batman configuration)

Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 40 insertions, 1 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 6b7a5d3eeb77..365ed74f3946 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -59,6 +59,45 @@ out:
         return hard_iface;
 }
 
+/**
+ * batadv_is_on_batman_iface - check if a device is a batman iface descendant
+ * @net_dev: the device to check
+ *
+ * If the user creates any virtual device on top of a batman-adv interface, it
+ * is important to prevent this new interface to be used to create a new mesh
+ * network (this behaviour would lead to a batman-over-batman configuration).
+ * This function recursively checks all the fathers of the device passed as
+ * argument looking for a batman-adv soft interface.
+ *
+ * Returns true if the device is descendant of a batman-adv mesh interface (or
+ * if it is a batman-adv interface itself), false otherwise
+ */
+static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
+{
+        struct net_device *parent_dev;
+        bool ret;
+
+        /* check if this is a batman-adv mesh interface */
+        if (batadv_softif_is_valid(net_dev))
+                return true;
+
+        /* no more parents..stop recursion */
+        if (net_dev->iflink == net_dev->ifindex)
+                return false;
+
+        /* recurse over the parent device */
+        parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
+        /* if we got a NULL parent_dev there is something broken.. */
+        if (WARN(!parent_dev, "Cannot find parent device"))
+                return false;
+
+        ret = batadv_is_on_batman_iface(parent_dev);
+
+        if (parent_dev)
+                dev_put(parent_dev);
+        return ret;
+}
+
 static int batadv_is_valid_iface(const struct net_device *net_dev)
 {
         if (net_dev->flags & IFF_LOOPBACK)
@@ -71,7 +110,7 @@ static int batadv_is_valid_iface(const struct net_device *net_dev)
                 return 0;
 
         /* no batman over batman */
-        if (batadv_softif_is_valid(net_dev))
+        if (batadv_is_on_batman_iface(net_dev))
                 return 0;
 
         return 1;