4.9-stable review patch. If anyone has any objections, please let me know.
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From: Emmanuel Grumbach emmanuel.grumbach@intel.com
[ 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 --- net/mac80211/mlme.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
--- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1282,6 +1282,16 @@ ieee80211_sta_process_chanswitch(struct 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(struc 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(struc 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(struc
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(struc } 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);