mac80211: add probe request filter flag

Using the frame registration notification, we
can see when probe requests are requested and
notify the low-level driver via filtering. The
flag is also set in AP and IBSS modes.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 32 insertions, 2 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 25fb351e00f8..18bd0e550600 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1604,6 +1604,23 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
         return 0;
 }
 
+static void ieee80211_mgmt_frame_register(struct wiphy *wiphy,
+                                          struct net_device *dev,
+                                          u16 frame_type, bool reg)
+{
+        struct ieee80211_local *local = wiphy_priv(wiphy);
+
+        if (frame_type != (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ))
+                return;
+
+        if (reg)
+                local->probe_req_reg++;
+        else
+                local->probe_req_reg--;
+
+        ieee80211_queue_work(&local->hw, &local->reconfig_filter);
+}
+
 struct cfg80211_ops mac80211_config_ops = {
         .add_virtual_intf = ieee80211_add_iface,
         .del_virtual_intf = ieee80211_del_iface,
@@ -1655,4 +1672,5 @@ struct cfg80211_ops mac80211_config_ops = {
         .cancel_remain_on_channel = ieee80211_cancel_remain_on_channel,
         .mgmt_tx = ieee80211_mgmt_tx,
         .set_cqm_rssi_config = ieee80211_set_cqm_rssi_config,
+        .mgmt_frame_register = ieee80211_mgmt_frame_register,
 };
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index f0610fa4fbe0..b80c38689927 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -707,7 +707,9 @@ struct ieee80211_local {
         int open_count;
         int monitors, cooked_mntrs;
         /* number of interfaces with corresponding FIF_ flags */
-        int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll;
+        int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll,
+            fif_probe_req;
+        int probe_req_reg;
         unsigned int filter_flags; /* FIF_* */
 
         bool wiphy_ciphers_allocated;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index e99d1b60557c..f9163b12c7f1 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -280,8 +280,11 @@ static int ieee80211_do_open(struct net_device *dev, bool coming_up)
                         ieee80211_start_mesh(sdata);
                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
                         local->fif_pspoll++;
+                        local->fif_probe_req++;
 
                         ieee80211_configure_filter(local);
+                } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                        local->fif_probe_req++;
                 }
 
                 changed |= ieee80211_reset_erp_info(sdata);
@@ -428,8 +431,12 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
         if (sdata->flags & IEEE80211_SDATA_PROMISC)
                 atomic_dec(&local->iff_promiscs);
 
-        if (sdata->vif.type == NL80211_IFTYPE_AP)
+        if (sdata->vif.type == NL80211_IFTYPE_AP) {
                 local->fif_pspoll--;
+                local->fif_probe_req--;
+        } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                local->fif_probe_req--;
+        }
 
         netif_addr_lock_bh(sdata->dev);
         spin_lock_bh(&local->filter_lock);
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 915ecf87e4ac..5162303a8b4a 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -54,6 +54,9 @@ void ieee80211_configure_filter(struct ieee80211_local *local)
         if (local->monitors || local->scanning)
                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
 
+        if (local->fif_probe_req || local->probe_req_reg)
+                new_flags |= FIF_PROBE_REQ;
+
         if (local->fif_fcsfail)
                 new_flags |= FIF_FCSFAIL;