hostapd: Add INTERFACE-ENABLED and INTERFACE-DISABLED events

These can be convenient for upper layer programs to determine if the
hostapd interface gets disabled/re-enabled, e.g., due to rfkill
block/unblock.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/drv_callbacks.c

@@ -1168,6 +1168,12 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 			hapd->iface, data->channel_list_changed.initiator);
 		break;
 #endif /* NEED_AP_MLME */
+	case EVENT_INTERFACE_ENABLED:
+		wpa_msg(hapd->msg_ctx, MSG_INFO, INTERFACE_ENABLED);
+		break;
+	case EVENT_INTERFACE_DISABLED:
+		wpa_msg(hapd->msg_ctx, MSG_INFO, INTERFACE_DISABLED);
+		break;
 	default:
 		wpa_printf(MSG_DEBUG, "Unknown event %d", event);
 		break;

src/common/wpa_ctrl.h

@@ -208,6 +208,9 @@ extern "C" {
 #define AP_EVENT_ENABLED "AP-ENABLED "
 #define AP_EVENT_DISABLED "AP-DISABLED "
 
+#define INTERFACE_ENABLED "INTERFACE-ENABLED "
+#define INTERFACE_DISABLED "INTERFACE-DISABLED "
+
 #define ACS_EVENT_STARTED "ACS-STARTED "
 #define ACS_EVENT_COMPLETED "ACS-COMPLETED "
 #define ACS_EVENT_FAILED "ACS-FAILED "