cfg80211: require HE capabilities for 6 GHz band

On 6 GHz band, HE capabilities must be available for all of
the interface types, otherwise we shouldn't use 6 GHz. Check
this.

Link: https://lore.kernel.org/r/20200528213443.5881cb3c8c4a.I583b54172f91f98d44af64a16c5826fe458cbb27@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 1651f86..5b67144 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -791,6 +791,7 @@ int wiphy_register(struct wiphy *wiphy)
        /* sanity check supported bands/channels */
        for (band = 0; band < NUM_NL80211_BANDS; band++) {
                u16 types = 0;
+               bool have_he = false;
 
                sband = wiphy->bands[band];
                if (!sband)
@@ -859,8 +860,17 @@ int wiphy_register(struct wiphy *wiphy)
                                return -EINVAL;
 
                        types |= iftd->types_mask;
+
+                       if (i == 0)
+                               have_he = iftd->he_cap.has_he;
+                       else
+                               have_he = have_he &&
+                                         iftd->he_cap.has_he;
                }
 
+               if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
+                       return -EINVAL;
+
                have_band = true;
        }