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From: Luca Coelho <luca@coelho.fi>
To: johannes@sipsolutions.net
Cc: linux-wireless@vger.kernel.org
Subject: [PATCH 10/11] mac80211: don't filter out beacons once we start CSA
Date: Sun,  6 Dec 2020 14:54:49 +0200
Message-ID: <iwlwifi.20201206145305.83470b8407e6.I739b907598001362744692744be15335436b8351@changeid> (raw)
In-Reply-To: <20201206125450.564941-1-luca@coelho.fi>

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

I hit a bug in which we started a CSA with an action frame,
but the AP changed its mind and didn't change the beacon.
The CSA wasn't cancelled and we lost the connection.

The beacons were ignored because they never changed: they
never contained any CSA IE. Because they never changed, the
CRC of the beacon didn't change either which made us ignore
the beacons instead of processing them.

Now what happens is:
1) beacon has CRC X and it is valid. No CSA IE in the beacon
2) as long as beacon's CRC X, don't process their IEs
3) rx action frame with CSA
4) invalidate the beacon's CRC
5) rx beacon, CRC is still X, but now it is invalid
6) process the beacon, detect there is no CSA IE
7) abort CSA

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/mlme.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 824dbba62794..b5967c215b0c 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1493,6 +1493,7 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 	sdata->csa_chandef = csa_ie.chandef;
 	sdata->csa_block_tx = csa_ie.mode;
 	ifmgd->csa_ignored_same_chan = false;
+	ifmgd->beacon_crc_valid = false;
 
 	if (sdata->csa_block_tx)
 		ieee80211_stop_vif_queues(local, sdata,
-- 
2.29.2


  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-06 12:54 [PATCH 00/11] cfg80211/mac80211 patches from our internal tree 2020-12-06 Luca Coelho
2020-12-06 12:54 ` [PATCH 01/11] cfg80211: remove struct ieee80211_he_bss_color Luca Coelho
2020-12-06 12:54 ` [PATCH 02/11] mac80211: use struct assignment for he_obss_pd Luca Coelho
2020-12-06 12:54 ` [PATCH 03/11] cfg80211: support immediate reconnect request hint Luca Coelho
2020-12-06 12:54 ` [PATCH 04/11] mac80211: support driver-based disconnect with reconnect hint Luca Coelho
2020-12-06 12:54 ` [PATCH 05/11] mac80211: don't set set TDLS STA bandwidth wider than possible Luca Coelho
2020-12-06 12:54 ` [PATCH 06/11] mac80211: support Rx timestamp calculation for all preamble types Luca Coelho
2020-12-06 12:54 ` [PATCH 07/11] mac80211: use bitfield helpers for BA session action frames Luca Coelho
2020-12-06 12:54 ` [PATCH 08/11] mac80211: ignore country element TX power on 6 GHz Luca Coelho
2020-12-06 12:54 ` [PATCH 09/11] mac80211: Fix calculation of minimal channel width Luca Coelho
2020-12-06 12:54 ` Luca Coelho [this message]
2020-12-06 12:54 ` [PATCH 11/11] mac80211: Update rate control on channel change Luca Coelho

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