DPP: Event message for indicating when Relay would need a Controller

The new DPP-RELAY-NEEDS-CONTROLLER control interface event can be used
to trigger mDNS discovery of a Controller to see if such a connection
can be established automatically at the time an Enrollee is trying to
initiate an operation.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>

src/ap/dpp_hostapd.c

@@ -1001,6 +1001,27 @@ void hostapd_dpp_listen_stop(struct hostapd_data *hapd)
 }
 
 
+#ifdef CONFIG_DPP2
+static void
+hostapd_dpp_relay_needs_controller(struct hostapd_data *hapd, const u8 *src,
+				   enum dpp_public_action_frame_type type)
+{
+	struct os_reltime now;
+
+	if (!hapd->conf->dpp_relay_port)
+		return;
+
+	os_get_reltime(&now);
+	if (hapd->dpp_relay_last_needs_ctrl.sec &&
+	    !os_reltime_expired(&now, &hapd->dpp_relay_last_needs_ctrl, 60))
+		return;
+	hapd->dpp_relay_last_needs_ctrl = now;
+	wpa_msg(hapd->msg_ctx, MSG_INFO, DPP_EVENT_RELAY_NEEDS_CONTROLLER
+		MACSTR " %u", MAC2STR(src), type);
+}
+#endif /* CONFIG_DPP2 */
+
+
 static void hostapd_dpp_rx_auth_req(struct hostapd_data *hapd, const u8 *src,
 				    const u8 *hdr, const u8 *buf, size_t len,
 				    unsigned int freq)
@@ -1049,6 +1070,8 @@ static void hostapd_dpp_rx_auth_req(struct hostapd_data *hapd, const u8 *src,
 					src, hdr, buf, len, freq, i_bootstrap,
 					r_bootstrap, hapd) == 0)
 			return;
+		hostapd_dpp_relay_needs_controller(hapd, src,
+						   DPP_PA_AUTHENTICATION_REQ);
 	}
 #endif /* CONFIG_DPP2 */
 	if (!own_bi) {
@@ -1668,6 +1691,8 @@ hostapd_dpp_rx_presence_announcement(struct hostapd_data *hapd, const u8 *src,
 			return;
 		wpa_printf(MSG_DEBUG,
 			   "DPP: No matching bootstrapping information found");
+		hostapd_dpp_relay_needs_controller(
+			hapd, src, DPP_PA_PRESENCE_ANNOUNCEMENT);
 		return;
 	}
 
@@ -1758,6 +1783,8 @@ hostapd_dpp_rx_reconfig_announcement(struct hostapd_data *hapd, const u8 *src,
 			return;
 		wpa_printf(MSG_DEBUG,
 			   "DPP: No matching Configurator information found");
+		hostapd_dpp_relay_needs_controller(
+			hapd, src, DPP_PA_RECONFIG_ANNOUNCEMENT);
 		return;
 	}
 
@@ -2198,9 +2225,12 @@ try_relay:
 #ifdef CONFIG_DPP2
 	if (v2 && dpp_relay_rx_action(hapd->iface->interfaces->dpp,
 				      src, hdr, buf, len, freq, NULL, NULL,
-				      hapd) != 0)
+				      hapd) != 0) {
 		wpa_printf(MSG_DEBUG,
 			   "DPP: No Relay available for the message");
+		hostapd_dpp_relay_needs_controller(hapd, src,
+						   DPP_PA_PKEX_EXCHANGE_REQ);
+	}
 #else /* CONFIG_DPP2 */
 	wpa_printf(MSG_DEBUG, "DPP: No relay functionality included - skip");
 #endif /* CONFIG_DPP2 */

src/ap/hostapd.h

@@ -433,6 +433,7 @@ struct hostapd_data {
 	int dpp_chirp_round;
 	int dpp_chirp_scan_done;
 	int dpp_chirp_listen;
+	struct os_reltime dpp_relay_last_needs_ctrl;
 #endif /* CONFIG_DPP2 */
 #ifdef CONFIG_TESTING_OPTIONS
 	char *dpp_config_obj_override;

src/common/wpa_ctrl.h

@@ -215,6 +215,7 @@ extern "C" {
 #define DPP_EVENT_CONF_NEEDED "DPP-CONF-NEEDED "
 #define DPP_EVENT_PB_STATUS "DPP-PB-STATUS "
 #define DPP_EVENT_PB_RESULT "DPP-PB-RESULT "
+#define DPP_EVENT_RELAY_NEEDS_CONTROLLER "DPP-RELAY-NEEDS-CONTROLLER "
 
 /* MESH events */
 #define MESH_GROUP_STARTED "MESH-GROUP-STARTED "