batman-adv: Handle parent interfaces in a different netns

batman-adv tries to prevent the user from placing a batX soft
interface into another batman mesh as a hard interface. It does this
by walking up the devices list of parents and ensures they are all
none batX interfaces. iflink can point to an interface in a different
namespace, so also retrieve the parents name space when finding the
parent and use it when doing the comparison.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven@narfation.org: Fix alignments, simplify parent netns retrieval]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 714af8e..43c9a3e 100644 (file)
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -35,6 +35,8 @@
 #include <linux/rtnetlink.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <net/net_namespace.h>
+#include <net/rtnetlink.h>
 
 #include "bat_v.h"
 #include "bridge_loop_avoidance.h"
@@ -83,26 +85,56 @@ out:
        return hard_iface;
 }
 
+/**
+ * batadv_getlink_net - return link net namespace (of use fallback)
+ * @netdev: net_device to check
+ * @fallback_net: return in case get_link_net is not available for @netdev
+ *
+ * Return: result of rtnl_link_ops->get_link_net or @fallback_net
+ */
+static const struct net *batadv_getlink_net(const struct net_device *netdev,
+                                           const struct net *fallback_net)
+{
+       if (!netdev->rtnl_link_ops)
+               return fallback_net;
+
+       if (!netdev->rtnl_link_ops->get_link_net)
+               return fallback_net;
+
+       return netdev->rtnl_link_ops->get_link_net(netdev);
+}
+
 /**
  * batadv_mutual_parents - check if two devices are each others parent
- * @dev1: 1st net_device
- * @dev2: 2nd net_device
+ * @dev1: 1st net dev
+ * @net1: 1st devices netns
+ * @dev2: 2nd net dev
+ * @net2: 2nd devices netns
  *
  * 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)
+                                 const struct net *net1,
+                                 const struct net_device *dev2,
+                                 const struct net *net2)
 {
        int dev1_parent_iflink = dev_get_iflink(dev1);
        int dev2_parent_iflink = dev_get_iflink(dev2);
+       const struct net *dev1_parent_net;
+       const struct net *dev2_parent_net;
+
+       dev1_parent_net = batadv_getlink_net(dev1, net1);
+       dev2_parent_net = batadv_getlink_net(dev2, net2);
 
        if (!dev1_parent_iflink || !dev2_parent_iflink)
                return false;
 
        return (dev1_parent_iflink == dev2->ifindex) &&
-              (dev2_parent_iflink == dev1->ifindex);
+              (dev2_parent_iflink == dev1->ifindex) &&
+              net_eq(dev1_parent_net, net2) &&
+              net_eq(dev2_parent_net, net1);
 }
 
 /**
@@ -120,8 +152,9 @@ static bool batadv_mutual_parents(const struct net_device *dev1,
  */
 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 {
-       struct net_device *parent_dev;
        struct net *net = dev_net(net_dev);
+       struct net_device *parent_dev;
+       const struct net *parent_net;
        bool ret;
 
        /* check if this is a batman-adv mesh interface */
@@ -133,13 +166,16 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
            dev_get_iflink(net_dev) == net_dev->ifindex)
                return false;
 
+       parent_net = batadv_getlink_net(net_dev, net);
+
        /* recurse over the parent device */
-       parent_dev = __dev_get_by_index(net, dev_get_iflink(net_dev));
+       parent_dev = __dev_get_by_index((struct net *)parent_net,
+                                       dev_get_iflink(net_dev));
        /* if we got a NULL parent_dev there is something broken.. */
        if (WARN(!parent_dev, "Cannot find parent device"))
                return false;
 
-       if (batadv_mutual_parents(net_dev, parent_dev))
+       if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
                return false;
 
        ret = batadv_is_on_batman_iface(parent_dev);