wifi: cfg80211: do not scan disabled links on 6GHz

If a link is disabled on 6GHz, we should not send a probe request on the
channel to resolve it. Simply skip such RNR entries so that the link is
ignored.

Userspace can still see the link in the RNR and may generate an ML probe
request in order to associate to the (currently) disabled link.

Signed-off-by: Benjamin Berg <[email protected]>
Signed-off-by: Gregory Greenman <[email protected]>
Link: https://lore.kernel.org/r/20230618214436.4f7384006471.Iff8f1081e76a298bd25f9468abb3a586372cddaa@changeid
Signed-off-by: Johannes Berg <[email protected]>

Author: benzea

net/wireless/scan.c

@@ -587,6 +587,13 @@ static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
 		entry->short_ssid_valid = true;
 
 		bss_params = tbtt_info->bss_params;
+
+		/* Ignore disabled links */
+		if (length >= offsetofend(typeof(*tbtt_info), mld_params)) {
+			if (le16_get_bits(tbtt_info->mld_params.params,
+					  IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK))
+				return -EINVAL;
+		}
 	} else {
 		struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos;