From e1a9ae3a73810c00e492485fdbae09f0dccb057e Mon Sep 17 00:00:00 2001 From: Chenming Huang Date: Mon, 23 Sep 2024 07:46:44 +0530 Subject: wifi: cfg80211: Do not create BSS entries for unsupported channels Currently, in cfg80211_parse_ml_elem_sta_data(), when RNR element indicates a BSS that operates in a channel that current regulatory domain doesn't support, a NULL value is returned by ieee80211_get_channel_khz() and assigned to this BSS entry's channel field. Later in cfg80211_inform_single_bss_data(), the reported BSS entry's channel will be wrongly overridden by transmitted BSS's. This could result in connection failure that when wpa_supplicant tries to select this reported BSS entry while it actually resides in an unsupported channel. Since this channel is not supported, it is reasonable to skip such entries instead of reporting wrong information. Signed-off-by: Chenming Huang Link: https://patch.msgid.link/20240923021644.12885-1-quic_chenhuan@quicinc.com Signed-off-by: Johannes Berg --- net/wireless/scan.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/wireless') diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 59a90bf3c0d6..d0aed41ded2f 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -3050,6 +3050,10 @@ cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy, freq = ieee80211_channel_to_freq_khz(ap_info->channel, band); data.channel = ieee80211_get_channel_khz(wiphy, freq); + /* Skip if RNR element specifies an unsupported channel */ + if (!data.channel) + continue; + /* Skip if BSS entry generated from MBSSID or DIRECT source * frame data available already. */ -- cgit v1.2.3 From 68d0021fe7231eec0fb84cd110cf62a6e782b72d Mon Sep 17 00:00:00 2001 From: Remi Pommarel Date: Tue, 24 Sep 2024 21:28:04 +0200 Subject: wifi: cfg80211: Add wiphy_delayed_work_pending() Add wiphy_delayed_work_pending() to check if any delayed work timer is pending, that can be used to be sure that wiphy_delayed_work_queue() won't postpone an already pending delayed work. Signed-off-by: Remi Pommarel Link: https://patch.msgid.link/20240924192805.13859-2-repk@triplefau.lt [fix return value kernel-doc] Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ net/wireless/core.c | 7 +++++++ 2 files changed, 51 insertions(+) (limited to 'net/wireless') diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 69ec1eb41a09..941dc62f3027 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -6129,6 +6129,50 @@ void wiphy_delayed_work_cancel(struct wiphy *wiphy, void wiphy_delayed_work_flush(struct wiphy *wiphy, struct wiphy_delayed_work *dwork); +/** + * wiphy_delayed_work_pending - Find out whether a wiphy delayable + * work item is currently pending. + * + * @wiphy: the wiphy, for debug purposes + * @dwork: the delayed work in question + * + * Return: true if timer is pending, false otherwise + * + * How wiphy_delayed_work_queue() works is by setting a timer which + * when it expires calls wiphy_work_queue() to queue the wiphy work. + * Because wiphy_delayed_work_queue() uses mod_timer(), if it is + * called twice and the second call happens before the first call + * deadline, the work will rescheduled for the second deadline and + * won't run before that. + * + * wiphy_delayed_work_pending() can be used to detect if calling + * wiphy_work_delayed_work_queue() would start a new work schedule + * or delayed a previous one. As seen below it cannot be used to + * detect precisely if the work has finished to execute nor if it + * is currently executing. + * + * CPU0 CPU1 + * wiphy_delayed_work_queue(wk) + * mod_timer(wk->timer) + * wiphy_delayed_work_pending(wk) -> true + * + * [...] + * expire_timers(wk->timer) + * detach_timer(wk->timer) + * wiphy_delayed_work_pending(wk) -> false + * wk->timer->function() | + * wiphy_work_queue(wk) | delayed work pending + * list_add_tail() | returns false but + * queue_work(cfg80211_wiphy_work) | wk->func() has not + * | been run yet + * [...] | + * cfg80211_wiphy_work() | + * wk->func() V + * + */ +bool wiphy_delayed_work_pending(struct wiphy *wiphy, + struct wiphy_delayed_work *dwork); + /** * enum ieee80211_ap_reg_power - regulatory power for an Access Point * diff --git a/net/wireless/core.c b/net/wireless/core.c index 661adfc77644..8331064de9dd 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -1704,6 +1704,13 @@ void wiphy_delayed_work_flush(struct wiphy *wiphy, } EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); +bool wiphy_delayed_work_pending(struct wiphy *wiphy, + struct wiphy_delayed_work *dwork) +{ + return timer_pending(&dwork->timer); +} +EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending); + static int __init cfg80211_init(void) { int err; -- cgit v1.2.3