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>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index adac1be..fbb02d2 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2019,6 +2019,11 @@ enum ieee80211_tdls_actioncode {
  */
 #define WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING   BIT(2)
 
+/* TDLS capabilities in the the 4th byte of @WLAN_EID_EXT_CAPABILITY */
+#define WLAN_EXT_CAPA4_TDLS_BUFFER_STA         BIT(4)
+#define WLAN_EXT_CAPA4_TDLS_PEER_PSM           BIT(5)
+#define WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH                BIT(6)
+
 /* Interworking capabilities are set in 7th bit of 4th byte of the
  * @WLAN_EID_EXT_CAPABILITY information element
  */
@@ -2030,6 +2035,7 @@ enum ieee80211_tdls_actioncode {
  */
 #define WLAN_EXT_CAPA5_TDLS_ENABLED    BIT(5)
 #define WLAN_EXT_CAPA5_TDLS_PROHIBITED BIT(6)
+#define WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED   BIT(7)
 
 #define WLAN_EXT_CAPA8_OPMODE_NOTIF    BIT(6)
 #define WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED    BIT(7)

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 442369f..ccdeef2 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -4095,6 +4095,8 @@ enum nl80211_ap_sme_features {
  * @NL80211_FEATURE_MAC_ON_CREATE: Device supports configuring
  *     the vif's MAC address upon creation.
  *     See 'macaddr' field in the vif_params (cfg80211.h).
+ * @NL80211_FEATURE_TDLS_CHANNEL_SWITCH: Driver supports channel switching when
+ *     operating as a TDLS peer.
  */
 enum nl80211_feature_flags {
        NL80211_FEATURE_SK_TX_STATUS                    = 1 << 0,
@@ -4125,6 +4127,7 @@ enum nl80211_feature_flags {
        NL80211_FEATURE_DYNAMIC_SMPS                    = 1 << 25,
        NL80211_FEATURE_SUPPORTS_WMM_ADMISSION          = 1 << 26,
        NL80211_FEATURE_MAC_ON_CREATE                   = 1 << 27,
+       NL80211_FEATURE_TDLS_CHANNEL_SWITCH             = 1 << 28,
 };
 
 /**

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index 30a4c10..4554bdc 100644 (file)
--- 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 &&