cfg80211: Enable GO operation on additional channels

Allow GO operation on a channel marked with IEEE80211_CHAN_GO_CONCURRENT
iff there is an active station interface that is associated to
an AP operating on the same channel in the 2 GHz band or the same UNII band
(in the 5 GHz band). This relaxation is not allowed if the channel is
marked with IEEE80211_CHAN_RADAR.

Note that this is a permissive approach to the FCC definitions,
that require a clear assessment that the device operating the AP is
an authorized master, i.e., with radar detection and DFS capabilities.

It is assumed that such restrictions are enforced by user space.
Furthermore, it is assumed, that if the conditions that allowed for
the operation of the GO on such a channel change, i.e., the station
interface disconnected from the AP, it is the responsibility of user
space to evacuate the GO from the channel.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 14d8d3417735..5640dc028bfa 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4539,12 +4539,14 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy,
  * cfg80211_reg_can_beacon - check if beaconing is allowed
  * @wiphy: the wiphy
  * @chandef: the channel definition
+ * @iftype: interface type
  *
  * Return: %true if there is no secondary channel or the secondary channel(s)
  * can be used for beaconing (i.e. is not a radar channel etc.)
  */
 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
-                             struct cfg80211_chan_def *chandef);
+                             struct cfg80211_chan_def *chandef,
+                             enum nl80211_iftype iftype);
 
 /*
  * cfg80211_ch_switch_notify - update wdev channel and notify userspace
diff --git a/include/net/regulatory.h b/include/net/regulatory.h
index 75fc1f5a948d..259992444e80 100644
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -131,6 +131,11 @@ struct regulatory_request {
  *      all country IE information processed by the regulatory core. This will
  *      override %REGULATORY_COUNTRY_IE_FOLLOW_POWER as all country IEs will
  *      be ignored.
+ * @REGULATORY_ENABLE_RELAX_NO_IR: for devices that wish to allow the
+ *      NO_IR relaxation, which enables transmissions on channels on which
+ *      otherwise initiating radiation is not allowed. This will enable the
+ *      relaxations enabled under the CFG80211_REG_RELAX_NO_IR configuration
+ *      option
  */
 enum ieee80211_regulatory_flags {
         REGULATORY_CUSTOM_REG                   = BIT(0),
@@ -138,6 +143,7 @@ enum ieee80211_regulatory_flags {
         REGULATORY_DISABLE_BEACON_HINTS         = BIT(2),
         REGULATORY_COUNTRY_IE_FOLLOW_POWER      = BIT(3),
         REGULATORY_COUNTRY_IE_IGNORE            = BIT(4),
+        REGULATORY_ENABLE_RELAX_NO_IR           = BIT(5),
 };
 
 struct ieee80211_freq_range {