batman-adv: Create batman soft interfaces within correct netns.

When creating a soft interface, create it in the same netns as the
hard interface. Replace all references to init_net with the correct
name space for the interface being manipulated.

Suggested-by: Daniel Ehlers <danielehlers@mindeye.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Antonio Quartulli <a@unstable.cc>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 0a7deaf..f0e1899 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -36,7 +36,6 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
-#include <net/net_namespace.h>
 
 #include "bridge_loop_avoidance.h"
 #include "debugfs.h"
@@ -121,6 +120,7 @@
 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);
 	bool ret;
 
 	/* check if this is a batman-adv mesh interface */
@@ -133,7 +133,7 @@
 		return false;
 
 	/* recurse over the parent device */
-	parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
+	parent_dev = __dev_get_by_index(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;
@@ -456,7 +456,7 @@
 }
 
 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
-				   const char *iface_name)
+				   struct net *net, const char *iface_name)
 {
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
@@ -470,10 +470,10 @@
 	if (!kref_get_unless_zero(&hard_iface->refcount))
 		goto out;
 
-	soft_iface = dev_get_by_name(&init_net, iface_name);
+	soft_iface = dev_get_by_name(net, iface_name);
 
 	if (!soft_iface) {
-		soft_iface = batadv_softif_create(iface_name);
+		soft_iface = batadv_softif_create(net, iface_name);
 
 		if (!soft_iface) {
 			ret = -ENOMEM;