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

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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>
This commit is contained in:
Emmanuel Grumbach 2018-08-31 11:31:12 +03:00 committed by Johannes Berg
parent 0007e94355
commit 6c18b27d6e
1 changed files with 15 additions and 2 deletions
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17
net/mac80211/mlme.c
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@ -1270,6 +1270,16 @@ 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);
@ -2453,6 +2463,7 @@ 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) {
@ -2460,6 +2471,8 @@ 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.
*/
@ -2467,7 +2480,7 @@ 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;
@ -2478,7 +2491,7 @@ 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);