nl80211: advertise HT/VHT channel limitations

When drivers or regulatory have limitations on
40, 80 or 160 MHz channels, advertise these to
userspace via nl80211. Also add a new feature
flag to let userspace know this is supported.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 90b7af86f392..3880f6ad7ed1 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2041,6 +2041,16 @@ enum nl80211_band_attr {
  *      (enum nl80211_dfs_state)
  * @NL80211_FREQUENCY_ATTR_DFS_TIME: time in miliseconds for how long
  *      this channel is in this DFS state.
+ * @NL80211_FREQUENCY_ATTR_NO_HT40_MINUS: HT40- isn't possible with this
+ *      channel as the control channel
+ * @NL80211_FREQUENCY_ATTR_NO_HT40_PLUS: HT40+ isn't possible with this
+ *      channel as the control channel
+ * @NL80211_FREQUENCY_ATTR_NO_80MHZ: any 80 MHz channel using this channel
+ *      as the primary or any of the secondary channels isn't possible,
+ *      this includes 80+80 channels
+ * @NL80211_FREQUENCY_ATTR_NO_160MHZ: any 160 MHz (but not 80+80) channel
+ *      using this channel as the primary or any of the secondary channels
+ *      isn't possible
  * @NL80211_FREQUENCY_ATTR_MAX: highest frequency attribute number
  *      currently defined
  * @__NL80211_FREQUENCY_ATTR_AFTER_LAST: internal use
@@ -2055,6 +2065,10 @@ enum nl80211_frequency_attr {
         NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
         NL80211_FREQUENCY_ATTR_DFS_STATE,
         NL80211_FREQUENCY_ATTR_DFS_TIME,
+        NL80211_FREQUENCY_ATTR_NO_HT40_MINUS,
+        NL80211_FREQUENCY_ATTR_NO_HT40_PLUS,
+        NL80211_FREQUENCY_ATTR_NO_80MHZ,
+        NL80211_FREQUENCY_ATTR_NO_160MHZ,
 
         /* keep last */
         __NL80211_FREQUENCY_ATTR_AFTER_LAST,
@@ -3421,6 +3435,8 @@ enum nl80211_ap_sme_features {
  *      Note that even for drivers that support this, the default is to add
  *      stations in authenticated/associated state, so to add unauthenticated
  *      stations the authenticated/associated bits have to be set in the mask.
+ * @NL80211_FEATURE_ADVERTISE_CHAN_LIMITS: cfg80211 advertises channel limits
+ *      (HT40, VHT 80/160 MHz) if this flag is set
  */
 enum nl80211_feature_flags {
         NL80211_FEATURE_SK_TX_STATUS                    = 1 << 0,
@@ -3437,6 +3453,7 @@ enum nl80211_feature_flags {
         NL80211_FEATURE_P2P_GO_CTWIN                    = 1 << 11,
         NL80211_FEATURE_P2P_GO_OPPPS                    = 1 << 12,
         NL80211_FEATURE_FULL_AP_CLIENT_STATE            = 1 << 13,
+        NL80211_FEATURE_ADVERTISE_CHAN_LIMITS           = 1 << 14,
 };
 
 /**