nl80211: Make use of driver's capability to detect inactive stations

When drivers advertise their capability to free up inactive
stations based on ap_max_inactivity, send the inactivity period
timeout to driver in NL80211_ATTR_INACTIVITY_TIMEOUT. This
introduces a WPA_DRIVER_FLAGS (WPA_DRIVER_FLAGS_INACTIVITY_TIMER)
so that the inactivity period will be sent only when this capability
bit is set.

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

src/ap/beacon.c

@@ -682,6 +682,7 @@ void ieee802_11_set_beacon(struct hostapd_data *hapd)
 	    !is_zero_ether_addr(hapd->conf->hessid))
 		params.hessid = hapd->conf->hessid;
 	params.access_network_type = hapd->conf->access_network_type;
+	params.ap_max_inactivity = hapd->conf->ap_max_inactivity;
 	if (hostapd_drv_set_ap(hapd, &params))
 		wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 	hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);

src/drivers/driver.h

@@ -707,6 +707,13 @@ struct wpa_driver_ap_params {
 	 * enabled.
 	 */
 	u8 access_network_type;
+
+	/**
+	 * ap_max_inactivity - Timeout in seconds to detect STA's inactivity
+	 *
+	 * This is used by driver which advertises this capability.
+	 */
+	int ap_max_inactivity;
 };
 
 /**
@@ -790,6 +797,8 @@ struct wpa_driver_capa {
 #define WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD		0x00200000
 /* Driver supports U-APSD in AP mode */
 #define WPA_DRIVER_FLAGS_AP_UAPSD			0x00400000
+/* Driver supports inactivity timer in AP mode */
+#define WPA_DRIVER_FLAGS_INACTIVITY_TIMER		0x00800000
 	unsigned int flags;
 
 	int max_scan_ssids;

src/drivers/driver_nl80211.c

@@ -2512,6 +2512,9 @@ broken_combination:
 
 		if (flags & NL80211_FEATURE_SK_TX_STATUS)
 			info->data_tx_status = 1;
+
+		if (flags & NL80211_FEATURE_INACTIVITY_TIMER)
+			capa->flags |= WPA_DRIVER_FLAGS_INACTIVITY_TIMER;
 	}
 
 	if (tb[NL80211_ATTR_PROBE_RESP_OFFLOAD]) {
@@ -5415,6 +5418,11 @@ static int wpa_driver_nl80211_set_ap(void *priv,
 			wpabuf_head(params->assocresp_ies));
 	}
 
+	if (drv->capa.flags & WPA_DRIVER_FLAGS_INACTIVITY_TIMER)  {
+		NLA_PUT_U16(msg, NL80211_ATTR_INACTIVITY_TIMEOUT,
+			    params->ap_max_inactivity);
+	}
+
 	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
 	if (ret) {
 		wpa_printf(MSG_DEBUG, "nl80211: Beacon set failed: %d (%s)",