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mac80211: upgrade passive scan to active scan on DFS channels after beacon rx

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In client mode, we can't connect to hidden SSID APs or SSIDs not advertised
in beacons on DFS channels, since we're forced to passive scan. Fix this by
sending out a probe request immediately after the first beacon, if active
scan was requested by the user.

Cc: stable@vger.kernel.org
Reported-by: Catrinel Catrinescu <cc@80211.de>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20220420104907.36275-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2022-04-20 12:49:07 +02:00 committed by Johannes Berg
parent 0969b96352
commit b041b7b9de
2 changed files with 25 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/mac80211/ieee80211_i.h
View File

@ -1148,6 +1148,9 @@ struct tpt_led_trigger {
* a scan complete for an aborted scan.
* @SCAN_HW_CANCELLED: Set for our scan work function when the scan is being
* cancelled.
* @SCAN_BEACON_WAIT: Set whenever we're passive scanning because of radar/no-IR
* and could send a probe request after receiving a beacon.
* @SCAN_BEACON_DONE: Beacon received, we can now send a probe request
*/
enum {
SCAN_SW_SCANNING,
@ -1156,6 +1159,8 @@ enum {
SCAN_COMPLETED,
SCAN_ABORTED,
SCAN_HW_CANCELLED,
SCAN_BEACON_WAIT,
SCAN_BEACON_DONE,
};
/**

20
net/mac80211/scan.c
View File

@ -281,6 +281,16 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
if (likely(!sdata1 && !sdata2))
return;
if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) {
/*
* we were passive scanning because of radar/no-IR, but
* the beacon/proberesp rx gives us an opportunity to upgrade
* to active scan
*/
set_bit(SCAN_BEACON_DONE, &local->scanning);
ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
}
if (ieee80211_is_probe_resp(mgmt->frame_control)) {
struct cfg80211_scan_request *scan_req;
struct cfg80211_sched_scan_request *sched_scan_req;
@ -787,6 +797,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
IEEE80211_CHAN_RADAR)) ||
!req->n_ssids) {
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
if (req->n_ssids)
set_bit(SCAN_BEACON_WAIT, &local->scanning);
} else {
ieee80211_scan_state_send_probe(local, &next_delay);
next_delay = IEEE80211_CHANNEL_TIME;
@ -998,6 +1010,8 @@ set_channel:
!scan_req->n_ssids) {
*next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
local->next_scan_state = SCAN_DECISION;
if (scan_req->n_ssids)
set_bit(SCAN_BEACON_WAIT, &local->scanning);
return;
}
@ -1090,6 +1104,8 @@ void ieee80211_scan_work(struct work_struct *work)
goto out;
}
clear_bit(SCAN_BEACON_WAIT, &local->scanning);
/*
* as long as no delay is required advance immediately
* without scheduling a new work
@ -1100,6 +1116,10 @@ void ieee80211_scan_work(struct work_struct *work)
goto out_complete;
}
if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
local->next_scan_state == SCAN_DECISION)
local->next_scan_state = SCAN_SEND_PROBE;
switch (local->next_scan_state) {
case SCAN_DECISION:
/* if no more bands/channels left, complete scan */