mac80211: avoid VHT usage with no 80MHz chans allowed
Currently if 80MHz channels are not allowed for use, the VHT IE is not
included in the probe request for an AP. This is not good enough if the
AP is configured with the wrong regulatory and supports VHT even where
prohibited or in TDLS scenarios.
Mark the ifmgd with the DISABLE_VHT flag for the misbehaving-AP case, and
unset VHT support from the peer-station entry for the TDLS case.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index 834ccdb..ff1c798 100644
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -120,6 +120,7 @@
struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
struct ieee80211_sta_vht_cap own_cap;
u32 cap_info, i;
+ bool have_80mhz;
memset(vht_cap, 0, sizeof(*vht_cap));
@@ -129,6 +130,20 @@
if (!vht_cap_ie || !sband->vht_cap.vht_supported)
return;
+ /* Allow VHT if at least one channel on the sband supports 80 MHz */
+ have_80mhz = false;
+ for (i = 0; i < sband->n_channels; i++) {
+ if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
+ IEEE80211_CHAN_NO_80MHZ))
+ continue;
+
+ have_80mhz = true;
+ break;
+ }
+
+ if (!have_80mhz)
+ return;
+
/*
* A VHT STA must support 40 MHz, but if we verify that here
* then we break a few things - some APs (e.g. Netgear R6300v2