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diff --git a/sys/net80211/ieee80211_vht.h b/sys/net80211/ieee80211_vht.h
--- a/sys/net80211/ieee80211_vht.h
+++ b/sys/net80211/ieee80211_vht.h
@@ -65,4 +65,8 @@
void ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node *ni,
struct ieee80211_vht_operation *, int);
+bool ieee80211_vht_check_tx_vht(const struct ieee80211_node *);
+bool ieee80211_vht_check_tx_vht40(const struct ieee80211_node *);
+bool ieee80211_vht_check_tx_vht80(const struct ieee80211_node *);
+
#endif /* _NET80211_IEEE80211_VHT_H_ */
diff --git a/sys/net80211/ieee80211_vht.c b/sys/net80211/ieee80211_vht.c
--- a/sys/net80211/ieee80211_vht.c
+++ b/sys/net80211/ieee80211_vht.c
@@ -873,3 +873,71 @@
{
printf("%s: called; TODO!\n", __func__);
}
+
+/*
+ * Return true if VHT rates can be used for the given node.
+ */
+bool
+ieee80211_vht_check_tx_vht(const struct ieee80211_node *ni)
+{
+ const struct ieee80211vap *vap;
+ const struct ieee80211_channel *bss_chan;
+
+ if (ni == NULL || ni->ni_chan == IEEE80211_CHAN_ANYC ||
+ ni->ni_vap == NULL || ni->ni_vap->iv_bss == NULL)
+ return (false);
+
+ vap = ni->ni_vap;
+ bss_chan = vap->iv_bss->ni_chan;
+
+ if (bss_chan == IEEE80211_CHAN_ANYC)
+ return (false);
+
+ return (IEEE80211_IS_CHAN_VHT(ni->ni_chan));
+}
+
+/*
+ * Return true if VHT 40 rates can be transmitted to the given node.
+ *
+ * This verifies that the BSS is VHT40 capable and the current
+ * node channel width is 40MHz.
+ */
+bool
+ieee80211_vht_check_tx_vht40(const struct ieee80211_node *ni)
+{
+ struct ieee80211vap *vap;
+ struct ieee80211_channel *bss_chan;
+
+ if (! ieee80211_vht_check_tx_vht(ni))
+ return (false);
+
+ vap = ni->ni_vap;
+ bss_chan = vap->iv_bss->ni_chan;
+
+ return (IEEE80211_IS_CHAN_VHT40(bss_chan) &&
+ IEEE80211_IS_CHAN_VHT40(ni->ni_chan) &&
+ (ni->ni_chw == IEEE80211_STA_RX_BW_40));
+}
+
+/*
+ * Return true if VHT 80 rates can be transmitted to the given node.
+ *
+ * This verifies that the BSS is VHT80 capable and the current
+ * node channel width is 80MHz.
+ */
+bool
+ieee80211_vht_check_tx_vht80(const struct ieee80211_node *ni)
+{
+ struct ieee80211vap *vap;
+ struct ieee80211_channel *bss_chan;
+
+ if (! ieee80211_vht_check_tx_vht(ni))
+ return (false);
+
+ vap = ni->ni_vap;
+ bss_chan = vap->iv_bss->ni_chan;
+
+ return (IEEE80211_IS_CHAN_VHT80(bss_chan) &&
+ IEEE80211_IS_CHAN_VHT80(ni->ni_chan) &&
+ (ni->ni_chw == IEEE80211_STA_RX_BW_80));
+}

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