Commit 4e39ccac authored by Antonio Quartulli's avatar Antonio Quartulli Committed by Johannes Berg
Browse files

mac80211: do not actively scan DFS channels 



DFS channels should not be actively scanned as we can't be sure
if we are allowed or not.

If the current channel is in the DFS band, active scan might be
performed after CSA, but we have no guarantee about other channels,
therefore it is safer to prevent active scanning at all.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarAntonio Quartulli <antonio@open-mesh.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 835112b2

net/mac80211/scan.c

+5 −4
Original line number Diff line number Diff line
@@ -597,8 +597,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 
		/* We need to ensure power level is at max for scanning. */

		ieee80211_hw_config(local, 0);



		if ((req->channels[0]->flags &

		     IEEE80211_CHAN_NO_IR) ||

		if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |

						IEEE80211_CHAN_RADAR)) ||

		    !req->n_ssids) {

			next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;

		} else {
@@ -645,7 +645,7 @@ ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 
	 * TODO: channel switching also consumes quite some time,

	 * add that delay as well to get a better estimation

	 */

	if (chan->flags & IEEE80211_CHAN_NO_IR)

	if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))

		return IEEE80211_PASSIVE_CHANNEL_TIME;

	return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;

}
@@ -777,7 +777,8 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 
	 *

	 * In any case, it is not necessary for a passive scan.

	 */

	if (chan->flags & IEEE80211_CHAN_NO_IR || !scan_req->n_ssids) {

	if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||

	    !scan_req->n_ssids) {

		*next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;

		local->next_scan_state = SCAN_DECISION;

		return;

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