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>

2 files changed, 8 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 00a50a38c7f2..9bca2abbf038 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -865,6 +865,9 @@ enum ieee80211_tkip_key_type {
  *
  * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS:
  *      Hardware has support for dynamic PS.
+ *
+ * @IEEE80211_HW_MFP_CAPABLE:
+ *      Hardware supports management frame protection (MFP, IEEE 802.11w).
  */
 enum ieee80211_hw_flags {
         IEEE80211_HW_RX_INCLUDES_FCS                    = 1<<1,
@@ -880,6 +883,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_SUPPORTS_PS                        = 1<<11,
         IEEE80211_HW_PS_NULLFUNC_STACK                  = 1<<12,
         IEEE80211_HW_SUPPORTS_DYNAMIC_PS                = 1<<13,
+        IEEE80211_HW_MFP_CAPABLE                        = 1<<14,
 };
 
 /**
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;