WNM: Ignore WNM-Sleep Mode Request in wnm_sleep_mode=0 case

The hostapd wnm_sleep_mode parameter was previously used to control
advertisement of WNM-Sleep Mode support, but it was not used when
processing a request to use WNM-Sleep Mode. Add an explicit check during
request processing as well so that any misbehaving station is ignored.

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

src/ap/wnm_ap.c

@@ -200,6 +200,13 @@ static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd,
 	u8 *tfsreq_ie_end = NULL;
 	u16 tfsreq_ie_len = 0;
 
+	if (!hapd->conf->wnm_sleep_mode) {
+		wpa_printf(MSG_DEBUG, "Ignore WNM-Sleep Mode Request from "
+			   MACSTR " since WNM-Sleep Mode is disabled",
+			   MAC2STR(addr));
+		return;
+	}
+
 	dialog_token = *pos++;
 	while (pos + 1 < frm + len) {
 		u8 ie_len = pos[1];