cfg80211: Add AP beacon regulatory hints

When devices are world roaming they cannot beacon or do active scan
on 5 GHz or on channels 12, 13 and 14 on the 2 GHz band. Although
we have a good regulatory API some cards may _always_ world roam, this
is also true when a system does not have CRDA present. Devices doing world
roaming can still passive scan, if they find a beacon from an AP on
one of the world roaming frequencies we make the assumption we can do
the same and we also remove the passive scan requirement.

This adds support for providing beacon regulatory hints based on scans.
This works for devices that do either hardware or software scanning.
If a channel has not yet been marked as having had a beacon present
on it we queue the beacon hint processing into the workqueue.

All wireless devices will benefit from beacon regulatory hints from
any wireless device on a system including new devices connected to
the system at a later time.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/net/wireless.h b/include/net/wireless.h
index 1f4707d18adb..64a76208580c 100644
--- a/include/net/wireless.h
+++ b/include/net/wireless.h
@@ -69,6 +69,9 @@ enum ieee80211_channel_flags {
  * @band: band this channel belongs to.
  * @max_antenna_gain: maximum antenna gain in dBi
  * @max_power: maximum transmission power (in dBm)
+ * @beacon_found: helper to regulatory code to indicate when a beacon
+ *      has been found on this channel. Use regulatory_hint_found_beacon()
+ *      to enable this, this is is useful only on 5 GHz band.
  * @orig_mag: internal use
  * @orig_mpwr: internal use
  */
@@ -80,6 +83,7 @@ struct ieee80211_channel {
         u32 flags;
         int max_antenna_gain;
         int max_power;
+        bool beacon_found;
         u32 orig_flags;
         int orig_mag, orig_mpwr;
 };
@@ -425,7 +429,6 @@ extern int regulatory_hint(struct wiphy *wiphy, const char *alpha2);
 extern void regulatory_hint_11d(struct wiphy *wiphy,
                                 u8 *country_ie,
                                 u8 country_ie_len);
-
 /**
  * wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
  * @wiphy: the wireless device we want to process the regulatory domain on