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diff --git a/lib/layer/iterate.h b/lib/layer/iterate.h
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+/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "lib/layer.h"
+#include "lib/rplan.h"
+
+/* Packet classification. */
+enum {
+ PKT_NOERROR = 1 << 0, /* Positive response */
+ PKT_NODATA = 1 << 1, /* No data response */
+ PKT_NXDOMAIN = 1 << 2, /* Negative response */
+ PKT_REFUSED = 1 << 3, /* Refused response */
+ PKT_ERROR = 1 << 4 /* Bad message */
+};
+
+/** Classify response by type. */
+KR_EXPORT
+int kr_response_classify(const knot_pkt_t *pkt);
+
+/** Make next iterative query. */
+KR_EXPORT
+int kr_make_query(struct kr_query *query, knot_pkt_t *pkt);