qcacmn: Accept nan responder request without iface name

The service layer need not provide the iface name in the
responder request to the driver if the request is being rejected.
The service layer maps the ndp_instance_id only after accepting
the request, if the ndp indication is rejected, the user space
has no knowledge of the iface name on which the NDP would have
gotten mapped if it were successful

CRs-Fixed: 2222041
Change-Id: I94a7de0c98c14dbe2389dd8364b6dd78858a9d0a

src/os_if_nan.c

@@ -406,22 +406,36 @@ static int os_if_nan_process_ndp_responder_req(struct wlan_objmgr_psoc *psoc,
 	struct wlan_objmgr_vdev *nan_vdev;
 	struct nan_datapath_responder_req req = {0};
 
-	if (!tb[QCA_WLAN_VENDOR_ATTR_NDP_IFACE_STR]) {
-		cfg80211_err("Interface name string is unavailable");
-		return -EINVAL;
-	}
+	if (tb[QCA_WLAN_VENDOR_ATTR_NDP_IFACE_STR]) {
+		iface_name = nla_data(tb[QCA_WLAN_VENDOR_ATTR_NDP_IFACE_STR]);
 
-	iface_name = nla_data(tb[QCA_WLAN_VENDOR_ATTR_NDP_IFACE_STR]);
-	/* Check if there is already an existing NAN interface */
-	nan_vdev = wlan_util_get_vdev_by_ifname(psoc, iface_name, WLAN_NAN_ID);
-	if (!nan_vdev) {
-		cfg80211_err("NAN data interface %s not available", iface_name);
-		return -EINVAL;
-	}
+		/* Check if there is already an existing NAN interface */
+		nan_vdev = wlan_util_get_vdev_by_ifname(psoc, iface_name,
+				WLAN_NAN_ID);
+		if (!nan_vdev) {
+			cfg80211_err("NAN data interface %s not available",
+				iface_name);
+			return -ENODEV;
+		}
 
-	if (nan_vdev->vdev_mlme.vdev_opmode != QDF_NDI_MODE) {
-		cfg80211_err("Interface found is not NDI");
-		return -EINVAL;
+		if (nan_vdev->vdev_mlme.vdev_opmode != QDF_NDI_MODE) {
+			cfg80211_err("Interface found is not NDI");
+			return -ENODEV;
+		}
+	} else {
+		/*
+		 * If the data indication is rejected, the userspace
+		 * may not send the iface name. Use the first available NDI
+		 * in that case
+		 */
+		cfg80211_debug("ndp rsp rejected, using first available NDI");
+
+		nan_vdev = wlan_objmgr_get_vdev_by_opmode_from_psoc(psoc,
+				QDF_NDI_MODE, WLAN_NAN_ID);
+		if (!nan_vdev) {
+			cfg80211_err("NAN data interface is not available");
+			return -ENODEV;
+		}
 	}
 
 	state = ucfg_nan_get_ndi_state(nan_vdev);