AP: Expire STA without entry in kernel

If the inactivity check returns that there is no entry remaining for the
STA in the kernel, drop the STA in hostapd as well.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

src/ap/sta_info.c

@@ -370,6 +370,13 @@ void ap_handle_timer(void *eloop_ctx, void *timeout_ctx)
 			 * but do not disconnect the station now.
 			 */
 			next_time = hapd->conf->ap_max_inactivity + fuzz;
+		} else if (inactive_sec == -ENOENT) {
+			wpa_msg(hapd->msg_ctx, MSG_DEBUG,
+				"Station " MACSTR " has lost its driver entry",
+				MAC2STR(sta->addr));
+
+			if (hapd->conf->skip_inactivity_poll)
+				sta->timeout_next = STA_DISASSOC;
 		} else if (inactive_sec < hapd->conf->ap_max_inactivity) {
 			/* station activity detected; reset timeout state */
 			wpa_msg(hapd->msg_ctx, MSG_DEBUG,

src/drivers/driver_nl80211.c

@@ -5219,6 +5219,8 @@ static int i802_get_inact_sec(void *priv, const u8 *addr)
 
 	data.inactive_msec = (unsigned long) -1;
 	ret = i802_read_sta_data(priv, &data, addr);
+	if (ret == -ENOENT)
+		return -ENOENT;
 	if (ret || data.inactive_msec == (unsigned long) -1)
 		return -1;
 	return data.inactive_msec / 1000;