From: Johannes Berg johannes.berg@intel.com
[ Upstream commit 3660944a37ce73890292571f44f04891834f9044 ]
If the AP advertises a band switch during CSA, we will not have the right information to continue working with it, since it will likely (have to) change its capabilities and we don't track any capability changes at all. Additionally, we store e.g. supported rates per band, and that information would become invalid.
Since this is a fringe scenario, just disconnect explicitly.
Signed-off-by: Luca Coelho luciano.coelho@intel.com Link: https://lore.kernel.org/r/iwlwifi.20201129172929.0e2327107c06.I461adb07704e0... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mac80211/mlme.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 4ab78bc6c2ca5..6a94b14817471 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1210,6 +1210,17 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, if (res) return;
+ if (sdata->vif.bss_conf.chandef.chan->band != + csa_ie.chandef.chan->band) { + sdata_info(sdata, + "AP %pM switches to different band (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", + ifmgd->associated->bssid, + csa_ie.chandef.chan->center_freq, + csa_ie.chandef.width, csa_ie.chandef.center_freq1, + csa_ie.chandef.center_freq2); + goto lock_and_drop_connection; + } + if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, IEEE80211_CHAN_DISABLED)) { sdata_info(sdata, @@ -1218,9 +1229,7 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, csa_ie.chandef.chan->center_freq, csa_ie.chandef.width, csa_ie.chandef.center_freq1, csa_ie.chandef.center_freq2); - ieee80211_queue_work(&local->hw, - &ifmgd->csa_connection_drop_work); - return; + goto lock_and_drop_connection; }
if (cfg80211_chandef_identical(&csa_ie.chandef, @@ -1310,6 +1319,9 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, TU_TO_EXP_TIME((csa_ie.count - 1) * cbss->beacon_interval)); return; + lock_and_drop_connection: + mutex_lock(&local->mtx); + mutex_lock(&local->chanctx_mtx); drop_connection: ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); mutex_unlock(&local->chanctx_mtx);