nl80211: Clear BSS state mismatches with deauth as a workaround

There seem to be some cases in which wpa_supplicant and
cfg80211/mac80211 seem to have different understanding on
authentication/association state. Since cfg80211/mac80211 is very strict
on when it accepts new authentication/association/scan commands, try our
best at clearing such state mismatches by explicitly deauthenticating
from BSSes with which the driver claims we are associated with if we do
not have local information about such association.

src/drivers/driver_nl80211.c

@@ -121,6 +121,8 @@ static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx,
 static int wpa_driver_nl80211_set_mode(void *priv, int mode);
 static int
 wpa_driver_nl80211_finish_drv_init(struct wpa_driver_nl80211_data *drv);
+static int wpa_driver_nl80211_mlme(struct wpa_driver_nl80211_data *drv,
+				   const u8 *addr, int cmd, u16 reason_code);
 
 #if defined(CONFIG_AP) || defined(HOSTAPD)
 static void nl80211_remove_monitor_interface(
@@ -1700,6 +1702,19 @@ static int bss_info_handler(struct nl_msg *msg, void *arg)
 }
 
 
+static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
+				 const u8 *addr)
+{
+	if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
+		wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
+			   "mismatch");
+		wpa_driver_nl80211_mlme(drv, addr,
+					NL80211_CMD_DEAUTHENTICATE,
+					WLAN_REASON_PREV_AUTH_NOT_VALID);
+	}
+}
+
+
 static void wpa_driver_nl80211_check_bss_status(
 	struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
 {
@@ -1734,13 +1749,16 @@ static void wpa_driver_nl80211_check_bss_status(
 				wpa_printf(MSG_DEBUG, "nl80211: Local state "
 					   "(not associated) does not match "
 					   "with BSS state");
+				clear_state_mismatch(drv, r->bssid);
 			} else if (drv->nlmode == NL80211_IFTYPE_STATION &&
 				   os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
 				   0) {
 				wpa_printf(MSG_DEBUG, "nl80211: Local state "
 					   "(associated with " MACSTR ") does "
 					   "not match with BSS state",
-					   MAC2STR(r->bssid));
+					   MAC2STR(drv->bssid));
+				clear_state_mismatch(drv, r->bssid);
+				clear_state_mismatch(drv, drv->bssid);
 			}
 		}
 	}