Add POLL_STA command to check connectivity in AP mode

The hostapd "POLL_STA <addr>" control interface command can be used to
check whether an associated station ACKs a QoS Data frame. The received
ACK for such a frame is reported as an event message ("AP-STA-POLL-OK
<addr>").

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

hostapd/ctrl_iface.c

@@ -2153,6 +2153,9 @@ static int hostapd_ctrl_iface_receive_process(struct hostapd_data *hapd,
 	} else if (os_strncmp(buf, "DISASSOCIATE ", 13) == 0) {
 		if (hostapd_ctrl_iface_disassociate(hapd, buf + 13))
 			reply_len = -1;
+	} else if (os_strncmp(buf, "POLL_STA ", 9) == 0) {
+		if (hostapd_ctrl_iface_poll_sta(hapd, buf + 9))
+			reply_len = -1;
 	} else if (os_strcmp(buf, "STOP_AP") == 0) {
 		if (hostapd_ctrl_iface_stop_ap(hapd))
 			reply_len = -1;

src/ap/ctrl_iface_ap.c

@@ -429,6 +429,27 @@ int hostapd_ctrl_iface_disassociate(struct hostapd_data *hapd,
 }
 
 
+int hostapd_ctrl_iface_poll_sta(struct hostapd_data *hapd,
+				const char *txtaddr)
+{
+	u8 addr[ETH_ALEN];
+	struct sta_info *sta;
+
+	wpa_dbg(hapd->msg_ctx, MSG_DEBUG, "CTRL_IFACE POLL_STA %s", txtaddr);
+
+	if (hwaddr_aton(txtaddr, addr))
+		return -1;
+
+	sta = ap_get_sta(hapd, addr);
+	if (!sta)
+		return -1;
+
+	hostapd_drv_poll_client(hapd, hapd->own_addr, addr,
+				sta->flags & WLAN_STA_WMM);
+	return 0;
+}
+
+
 int hostapd_ctrl_iface_status(struct hostapd_data *hapd, char *buf,
 			      size_t buflen)
 {

src/ap/ctrl_iface_ap.h

@@ -19,6 +19,8 @@ int hostapd_ctrl_iface_deauthenticate(struct hostapd_data *hapd,
 				      const char *txtaddr);
 int hostapd_ctrl_iface_disassociate(struct hostapd_data *hapd,
 				    const char *txtaddr);
+int hostapd_ctrl_iface_poll_sta(struct hostapd_data *hapd,
+				const char *txtaddr);
 int hostapd_ctrl_iface_status(struct hostapd_data *hapd, char *buf,
 			      size_t buflen);
 int hostapd_parse_csa_settings(const char *pos,

src/ap/ieee802_11.c

@@ -3013,6 +3013,8 @@ void hostapd_client_poll_ok(struct hostapd_data *hapd, const u8 *addr)
 	}
 	if (sta == NULL)
 		return;
+	wpa_msg(hapd->msg_ctx, MSG_INFO, AP_STA_POLL_OK MACSTR,
+		MAC2STR(sta->addr));
 	if (!(sta->flags & WLAN_STA_PENDING_POLL))
 		return;
 

src/common/wpa_ctrl.h

@@ -245,6 +245,7 @@ extern "C" {
 #define AP_STA_CONNECTED "AP-STA-CONNECTED "
 #define AP_STA_DISCONNECTED "AP-STA-DISCONNECTED "
 #define AP_STA_POSSIBLE_PSK_MISMATCH "AP-STA-POSSIBLE-PSK-MISMATCH "
+#define AP_STA_POLL_OK "AP-STA-POLL-OK "
 
 #define AP_REJECTED_MAX_STA "AP-REJECTED-MAX-STA "
 #define AP_REJECTED_BLOCKED_STA "AP-REJECTED-BLOCKED-STA "