cfg/mac80211: define TDLS channel switch feature bit

Define some related TDLS protocol constants and advertise channel switch
support in the extended-capabilities IE when the feature bit is defined.

Actually supporting TDLS channel-switching also requires support for
some new nl80211 commands, to be introduced by future patches.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index 30a4c1004010..4554bdc72c91 100644
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -35,16 +35,19 @@ void ieee80211_tdls_peer_del_work(struct work_struct *wk)
         mutex_unlock(&local->mtx);
 }
 
-static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
+static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
+                                         struct sk_buff *skb)
 {
         u8 *pos = (void *)skb_put(skb, 7);
+        bool chan_switch = local->hw.wiphy->features &
+                           NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
 
         *pos++ = WLAN_EID_EXT_CAPABILITY;
         *pos++ = 5; /* len */
         *pos++ = 0x0;
         *pos++ = 0x0;
         *pos++ = 0x0;
-        *pos++ = 0x0;
+        *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
 }
 
@@ -289,7 +292,7 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
                 offset = noffset;
         }
 
-        ieee80211_tdls_add_ext_capab(skb);
+        ieee80211_tdls_add_ext_capab(local, skb);
 
         /* add the QoS element if we support it */
         if (local->hw.queues >= IEEE80211_NUM_ACS &&