cfg80211: Make pre-CAC results valid only for ETSI domain

[mirror_ubuntu-bionic-kernel.git] / net / wireless / chan.c

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 5497d022fadabf17512c0f4c0b77ce50cce345dc..099f13c0c39e20431b2f61e61431f2cfd5dae2ff 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -456,6 +456,107 @@ bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
        return (r1 + r2 > 0);
 }
 
+/*
+ * Checks if center frequency of chan falls with in the bandwidth
+ * range of chandef.
+ */
+bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
+                         struct ieee80211_channel *chan)
+{
+       int width;
+       u32 cf_offset, freq;
+
+       if (chandef->chan->center_freq == chan->center_freq)
+               return true;
+
+       width = cfg80211_chandef_get_width(chandef);
+       if (width <= 20)
+               return false;
+
+       cf_offset = width / 2 - 10;
+
+       for (freq = chandef->center_freq1 - width / 2 + 10;
+            freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
+               if (chan->center_freq == freq)
+                       return true;
+       }
+
+       if (!chandef->center_freq2)
+               return false;
+
+       for (freq = chandef->center_freq2 - width / 2 + 10;
+            freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
+               if (chan->center_freq == freq)
+                       return true;
+       }
+
+       return false;
+}
+
+bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
+{
+       bool active = false;
+
+       ASSERT_WDEV_LOCK(wdev);
+
+       if (!wdev->chandef.chan)
+               return false;
+
+       switch (wdev->iftype) {
+       case NL80211_IFTYPE_AP:
+       case NL80211_IFTYPE_P2P_GO:
+               active = wdev->beacon_interval != 0;
+               break;
+       case NL80211_IFTYPE_ADHOC:
+               active = wdev->ssid_len != 0;
+               break;
+       case NL80211_IFTYPE_MESH_POINT:
+               active = wdev->mesh_id_len != 0;
+               break;
+       case NL80211_IFTYPE_STATION:
+       case NL80211_IFTYPE_OCB:
+       case NL80211_IFTYPE_P2P_CLIENT:
+       case NL80211_IFTYPE_MONITOR:
+       case NL80211_IFTYPE_AP_VLAN:
+       case NL80211_IFTYPE_WDS:
+       case NL80211_IFTYPE_P2P_DEVICE:
+       /* Can NAN type be considered as beaconing interface? */
+       case NL80211_IFTYPE_NAN:
+               break;
+       case NL80211_IFTYPE_UNSPECIFIED:
+       case NUM_NL80211_IFTYPES:
+               WARN_ON(1);
+       }
+
+       return active;
+}
+
+bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
+                                 struct ieee80211_channel *chan)
+{
+       struct wireless_dev *wdev;
+
+       ASSERT_RTNL();
+
+       if (!(chan->flags & IEEE80211_CHAN_RADAR))
+               return false;
+
+       list_for_each_entry(wdev, &wiphy->wdev_list, list) {
+               wdev_lock(wdev);
+               if (!cfg80211_beaconing_iface_active(wdev)) {
+                       wdev_unlock(wdev);
+                       continue;
+               }
+
+               if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
+                       wdev_unlock(wdev);
+                       return true;
+               }
+               wdev_unlock(wdev);
+       }
+
+       return false;
+}
 
 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
                                             u32 center_freq,