+/**
+ * struct ieee80211_bar - HT Block Ack Request
+ *
+ * This structure refers to "HT BlockAckReq" as
+ * described in 802.11n draft section 7.2.1.7.1
+ */
+struct ieee80211_bar {
+ __le16 frame_control;
+ __le16 duration;
+ __u8 ra[6];
+ __u8 ta[6];
+ __le16 control;
+ __le16 start_seq_num;
+} __attribute__((packed));
+
+/**
+ * struct ieee80211_ht_cap - HT capabilities
+ *
+ * This structure refers to "HT capabilities element" as
+ * described in 802.11n draft section 7.3.2.52
+ */
+struct ieee80211_ht_cap {
+ __le16 cap_info;
+ u8 ampdu_params_info;
+ u8 supp_mcs_set[16];
+ __le16 extended_ht_cap_info;
+ __le32 tx_BF_cap_info;
+ u8 antenna_selection_info;
+} __attribute__ ((packed));
+
+/**
+ * struct ieee80211_ht_cap - HT additional information
+ *
+ * This structure refers to "HT information element" as
+ * described in 802.11n draft section 7.3.2.53
+ */
+struct ieee80211_ht_addt_info {
+ u8 control_chan;
+ u8 ht_param;
+ __le16 operation_mode;
+ __le16 stbc_param;
+ u8 basic_set[16];
+} __attribute__ ((packed));
+
+/* 802.11n HT capabilities masks */
+#define IEEE80211_HT_CAP_SUP_WIDTH 0x0002
+#define IEEE80211_HT_CAP_MIMO_PS 0x000C
+#define IEEE80211_HT_CAP_GRN_FLD 0x0010
+#define IEEE80211_HT_CAP_SGI_20 0x0020
+#define IEEE80211_HT_CAP_SGI_40 0x0040
+#define IEEE80211_HT_CAP_DELAY_BA 0x0400
+#define IEEE80211_HT_CAP_MAX_AMSDU 0x0800
+#define IEEE80211_HT_CAP_AMPDU_FACTOR 0x03
+#define IEEE80211_HT_CAP_AMPDU_DENSITY 0x1C
+/* 802.11n HT IE masks */
+#define IEEE80211_HT_IE_CHA_SEC_OFFSET 0x03
+#define IEEE80211_HT_IE_CHA_WIDTH 0x04
+#define IEEE80211_HT_IE_HT_PROTECTION 0x0003
+#define IEEE80211_HT_IE_NON_GF_STA_PRSNT 0x0004
+#define IEEE80211_HT_IE_NON_HT_STA_PRSNT 0x0010
+
+/* MIMO Power Save Modes */
+#define WLAN_HT_CAP_MIMO_PS_STATIC 0
+#define WLAN_HT_CAP_MIMO_PS_DYNAMIC 1
+#define WLAN_HT_CAP_MIMO_PS_INVALID 2
+#define WLAN_HT_CAP_MIMO_PS_DISABLED 3