cfg80211: add event for unexpected 4addr frames

The frames are used by AP/STA WDS mode, and hostapd
needs to know when such a frame was received to set
up the VLAN appropriately to allow using it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index d94456e..12bf4d1 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -119,5 +119,7 @@
 
 bool nl80211_unexpected_frame(struct net_device *dev,
 			      const u8 *addr, gfp_t gfp);
+bool nl80211_unexpected_4addr_frame(struct net_device *dev,
+				    const u8 *addr, gfp_t gfp);
 
 #endif /* __NET_WIRELESS_NL80211_H */