mac80211: 802.11w - Add driver capability flag for MFP

This allows user space to determine whether a driver supports MFP and
behave properly without having to ask user to configure this in
MFP-optional mode.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index 2dd387495dfe..70a29b657b61 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -976,6 +976,10 @@ static int ieee80211_ioctl_siwauth(struct net_device *dev,
                         ret = -EOPNOTSUPP;
                 break;
         case IW_AUTH_MFP:
+                if (!(sdata->local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) {
+                        ret = -EOPNOTSUPP;
+                        break;
+                }
                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
                     sdata->vif.type == NL80211_IFTYPE_ADHOC)
                         sdata->u.sta.mfp = data->value;