mac80211: Mesh data frames must have the QoS header

Per sec 7.1.3.5 of draft 12.0 of 802.11s, mesh frames indicate the
presence of the mesh control header in their QoS header.

Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 37f95f2e..72f3933 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -130,6 +130,8 @@
 #define IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK	0x0060
 /* A-MSDU 802.11n */
 #define IEEE80211_QOS_CTL_A_MSDU_PRESENT	0x0080
+/* Mesh Control 802.11s */
+#define IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT  0x0100
 
 /* U-APSD queue for WMM IEs sent by AP */
 #define IEEE80211_WMM_IE_AP_QOSINFO_UAPSD	(1<<7)