wpa_supplicant: Add provision to configure inactivity period in AP mode

This patch adds a configuration in network block, ap_max_inactivity, for
station's inactivity period when in AP mode. The time period is
configured in seconds, by default 300 seconds.

Signed-hostap: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>

wpa_supplicant/ap.c

@@ -181,6 +181,9 @@ static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
 		wep->keys_set = 1;
 	}
 
+	if (ssid->ap_max_inactivity)
+		bss->ap_max_inactivity = ssid->ap_max_inactivity;
+
 	/* Select group cipher based on the enabled pairwise cipher suites */
 	pairwise = 0;
 	if (bss->wpa & 1)

wpa_supplicant/config.c

@@ -1602,6 +1602,7 @@ static const struct parse_data ssid_fields[] = {
 	{ INT_RANGE(ampdu_density, -1, 7) },
 	{ STR(ht_mcs) },
 #endif /* CONFIG_HT_OVERRIDES */
+	{ INT(ap_max_inactivity) },
 };
 
 #undef OFFSET

wpa_supplicant/config_ssid.h

@@ -484,6 +484,14 @@ struct wpa_ssid {
 	 */
 	char *ht_mcs;
 #endif /* CONFIG_HT_OVERRIDES */
+
+	/**
+	 * ap_max_inactivity - Timeout in seconds to detect STA's inactivity
+	 *
+	 * This timeout value is used in AP mode to clean up inactive stations.
+	 * By default: 300 seconds.
+	 */
+	int ap_max_inactivity;
 };
 
 #endif /* CONFIG_SSID_H */

wpa_supplicant/wpa_supplicant.conf

@@ -653,6 +653,23 @@ fast_reauth=1
 # number of authentication servers. Strict EAP conformance mode can be
 # configured by disabling workarounds with eap_workaround=0.
 
+# Station inactivity limit
+#
+# If a station does not send anything in ap_max_inactivity seconds, an
+# empty data frame is sent to it in order to verify whether it is
+# still in range. If this frame is not ACKed, the station will be
+# disassociated and then deauthenticated. This feature is used to
+# clear station table of old entries when the STAs move out of the
+# range.
+#
+# The station can associate again with the AP if it is still in range;
+# this inactivity poll is just used as a nicer way of verifying
+# inactivity; i.e., client will not report broken connection because
+# disassociation frame is not sent immediately without first polling
+# the STA with a data frame.
+# default: 300 (i.e., 5 minutes)
+#ap_max_inactivity=300
+
 # Example blocks:
 
 # Simple case: WPA-PSK, PSK as an ASCII passphrase, allow all valid ciphers