ieee80211: add struct ieee80211_hdr_qos

The header can be used to create qos nullfunc frames, for example.
Signed-off-by: NKalle Valo <kalle.valo@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

include/linux/ieee80211.h

@@ -157,6 +157,16 @@ struct ieee80211_hdr_3addr {
 	__le16 seq_ctrl;
 } __attribute__ ((packed));
 
+struct ieee80211_qos_hdr {
+	__le16 frame_control;
+	__le16 duration_id;
+	u8 addr1[6];
+	u8 addr2[6];
+	u8 addr3[6];
+	__le16 seq_ctrl;
+	__le16 qos_ctrl;
+} __attribute__ ((packed));
+
 /**
  * ieee80211_has_tods - check if IEEE80211_FCTL_TODS is set
  * @fc: frame control bytes in little-endian byteorder