cfg80211: add cfg80211_find_vendor_ie() function

Add function to find vendor-specific ie (along with
vendor-specific ie struct definition and P2P OUI values)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 72f3933..b5e0a5c 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -777,6 +777,13 @@
 	u8 mic[8];
 } __attribute__ ((packed));
 
+struct ieee80211_vendor_ie {
+	u8 element_id;
+	u8 len;
+	u8 oui[3];
+	u8 oui_type;
+} __packed;
+
 /* Control frames */
 struct ieee80211_rts {
 	__le16 frame_control;
@@ -1470,6 +1477,9 @@
 
 #define WLAN_PMKID_LEN			16
 
+#define WLAN_OUI_WFA			0x506f9a
+#define WLAN_OUI_TYPE_WFA_P2P		9
+
 /*
  * WMM/802.11e Tspec Element
  */