mac80211: don't Tx a deauth frame if the AP forbade Tx

[ Upstream commit 6c18b27d6e5c6a7206364eae2b47bc8d8b2fa68f ]

If the driver fails to properly prepare for the channel
switch, mac80211 will disconnect. If the CSA IE had mode
set to 1, it means that the clients are not allowed to send
any Tx on the current channel, and that includes the
deauthentication frame.

Make sure that we don't send the deauthentication frame in
this case.

In iwlwifi, this caused a failure to flush queues since the
firmware already closed the queues after having parsed the
CSA IE. Then mac80211 would wait until the deauthentication
frame would go out (drv_flush(drop=false)) and that would
never happen.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 04e6280f4819d97fd5ef7ddd2768297c066d87b1..39451c84c7859fc200e699119e8ebddc999b6d82 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1282,6 +1282,16 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
                                         cbss->beacon_interval));
        return;
  drop_connection:
+       /*
+        * This is just so that the disconnect flow will know that
+        * we were trying to switch channel and failed. In case the
+        * mode is 1 (we are not allowed to Tx), we will know not to
+        * send a deauthentication frame. Those two fields will be
+        * reset when the disconnection worker runs.
+        */
+       sdata->vif.csa_active = true;
+       sdata->csa_block_tx = csa_ie.mode;
+
        ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
        mutex_unlock(&local->chanctx_mtx);
        mutex_unlock(&local->mtx);
@@ -2454,6 +2464,7 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
+       bool tx;
 
        sdata_lock(sdata);
        if (!ifmgd->associated) {
@@ -2461,6 +2472,8 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
                return;
        }
 
+       tx = !sdata->csa_block_tx;
+
        /* AP is probably out of range (or not reachable for another reason) so
         * remove the bss struct for that AP.
         */
@@ -2468,7 +2481,7 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
 
        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                               WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
-                              true, frame_buf);
+                              tx, frame_buf);
        mutex_lock(&local->mtx);
        sdata->vif.csa_active = false;
        ifmgd->csa_waiting_bcn = false;
@@ -2479,7 +2492,7 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
        }
        mutex_unlock(&local->mtx);
 
-       ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
+       ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
                                    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
 
        sdata_unlock(sdata);