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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_bw(const struct ieee80211_node *,
+ enum ieee80211_sta_rx_bw);
+
#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 +873,132 @@
{
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 VHT40 rates can be transmitted to the given node.
+ *
+ * This verifies that the BSS is VHT40 capable and the current
+ * node channel width is 40MHz.
+ */
+static 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 VHT80 rates can be transmitted to the given node.
+ *
+ * This verifies that the BSS is VHT80 capable and the current
+ * node channel width is 80MHz.
+ */
+static 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));
+}
+
+/*
+ * Return true if VHT 160 rates can be transmitted to the given node.
+ *
+ * This verifies that the BSS is VHT80+80 or VHT160 capable and the current
+ * node channel width is 80+80MHz or 160MHz.
+ */
+static bool
+ieee80211_vht_check_tx_vht160(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;
+
+ if (ni->ni_chw != IEEE80211_STA_RX_BW_160)
+ return (false);
+
+ if (IEEE80211_IS_CHAN_VHT160(bss_chan) &&
+ IEEE80211_IS_CHAN_VHT160(ni->ni_chan))
+ return (true);
+
+ if (IEEE80211_IS_CHAN_VHT80P80(bss_chan) &&
+ IEEE80211_IS_CHAN_VHT80P80(ni->ni_chan))
+ return (true);
+
+ return (false);
+}
+
+/*
+ * Check if the given transmit bandwidth is available to the given
+ * node.
+ *
+ * This isn't ENTIRELY correct at the moment as the individual
+ * checks are unfortunately doing much stricter channel/bandwidth
+ * checks, but it will be enough for basic station mode operation.
+ */
+bool
+ieee80211_vht_check_tx_bw(const struct ieee80211_node *ni,
+ enum ieee80211_sta_rx_bw bw)
+{
+
+ switch (bw) {
+ case IEEE80211_STA_RX_BW_20:
+ return (ieee80211_vht_check_tx_vht(ni));
+ case IEEE80211_STA_RX_BW_40:
+ return (ieee80211_vht_check_tx_vht40(ni));
+ case IEEE80211_STA_RX_BW_80:
+ return (ieee80211_vht_check_tx_vht80(ni));
+ case IEEE80211_STA_RX_BW_160:
+ return (ieee80211_vht_check_tx_vht160(ni));
+ case IEEE80211_STA_RX_BW_320:
+ return (false);
+ default:
+ return (false);
+ }
+}

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