batman-adv: detect clients connected through a 802.11 device

Clients connected through a 802.11 device are now marked with the
TT_CLIENT_WIFI flag. This flag is also advertised with the tt
announcement.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

1 files changed, 30 insertions, 0 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 0d73e1e9e3d5..bf91e4d8a47f 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -681,6 +681,36 @@ err_out:
         return NET_RX_DROP;
 }
 
+/* This function returns true if the interface represented by ifindex is a
+ * 802.11 wireless device */
+bool is_wifi_iface(int ifindex)
+{
+        struct net_device *net_device = NULL;
+        bool ret = false;
+
+        if (ifindex == NULL_IFINDEX)
+                goto out;
+
+        net_device = dev_get_by_index(&init_net, ifindex);
+        if (!net_device)
+                goto out;
+
+#ifdef CONFIG_WIRELESS_EXT
+        /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
+         * check for wireless_handlers != NULL */
+        if (net_device->wireless_handlers)
+                ret = true;
+        else
+#endif
+                /* cfg80211 drivers have to set ieee80211_ptr */
+                if (net_device->ieee80211_ptr)
+                        ret = true;
+out:
+        if (net_device)
+                dev_put(net_device);
+        return ret;
+}
+
 struct notifier_block hard_if_notifier = {
         .notifier_call = hard_if_event,
 };