cfg80211: allow user space to query the operating frequency

@@ -75,6 +75,7 @@ struct cfg80211_registered_device {
 
 	/* current channel */
 	struct ieee80211_channel *channel;
+	enum nl80211_channel_type channel_type;
 
 	/* must be last because of the way we do wiphy_priv(),
 	 * and it should at least be aligned to NETDEV_ALIGN */

@@ -97,6 +97,7 @@ int rdev_set_freq(struct cfg80211_regist
 		return result;
 
 	rdev->channel = chan;
+	rdev->channel_type = channel_type;
 
 	return 0;
 }

@@ -881,6 +881,11 @@ static int nl80211_send_iface(struct sk_
 	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
 	NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
 	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, dev->ieee80211_ptr->iftype);
+	if (rdev->channel) {
+		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, rdev->channel->center_freq);
+		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, rdev->channel_type);
+	}
+
 
 	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
 		    rdev->devlist_generation ^