new file mode 100644
--- /dev/null
+++ b/src/event/quic/ngx_event_quic_migration.c
@@ -0,0 +1,46 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_event_quic_transport.h>
+#include <ngx_event_quic_connection.h>
+#include <ngx_event_quic_migration.h>
+
+
+ngx_int_t
+ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
+    ngx_quic_header_t *pkt, ngx_quic_path_challenge_frame_t *f)
+{
+    ngx_quic_frame_t       *frame;
+    ngx_quic_connection_t  *qc;
+
+    qc = ngx_quic_get_connection(c);
+
+    frame = ngx_quic_alloc_frame(c);
+    if (frame == NULL) {
+        return NGX_ERROR;
+    }
+
+    frame->level = pkt->level;
+    frame->type = NGX_QUIC_FT_PATH_RESPONSE;
+    frame->u.path_response = *f;
+
+    ngx_quic_queue_frame(qc, frame);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
+ngx_quic_handle_path_response_frame(ngx_connection_t *c,
+    ngx_quic_header_t *pkt, ngx_quic_path_challenge_frame_t *f)
+{
+    /* TODO */
+    return NGX_OK;
+}
+