mac80211: fix various components for the new 5 and 10 MHz widths

This is a collection of minor fixes:
 * don't allow HT IEs in IBSS for 5/10 MHz
 * don't allow HT IEs in Mesh for 5/10 MHz
 * don't downgrade from/to 5 and 10 MHz channels
 * don't try HT rates for 5 and 10 MHz channels when selecting rates

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 87f2d4df31f8..e0939eb79060 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -190,6 +190,12 @@ static u32 chandef_downgrade(struct cfg80211_chan_def *c)
                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
                 break;
+        case NL80211_CHAN_WIDTH_5:
+        case NL80211_CHAN_WIDTH_10:
+                WARN_ON_ONCE(1);
+                /* keep c->width */
+                ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
+                break;
         }
 
         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
@@ -3771,6 +3777,12 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
          */
         ret = ieee80211_vif_use_channel(sdata, &chandef,
                                         IEEE80211_CHANCTX_SHARED);
+
+        /* don't downgrade for 5 and 10 MHz channels, though. */
+        if (chandef.width == NL80211_CHAN_WIDTH_5 ||
+            chandef.width == NL80211_CHAN_WIDTH_10)
+                return ret;
+
         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
                 ifmgd->flags |= chandef_downgrade(&chandef);
                 ret = ieee80211_vif_use_channel(sdata, &chandef,