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 --- net/mac80211/mlme.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index a287b3891643..328ac10084e4 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1280,6 +1280,16 @@ 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); @@ -2450,6 +2460,7 @@ 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) { @@ -2457,6 +2468,8 @@ 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. */ @@ -2464,7 +2477,7 @@ 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; @@ -2475,7 +2488,7 @@ 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);