Support struct tunnel

src/packet/packet_utils.cpp

@@ -186,4 +186,18 @@ void packet_free(struct packet *pkt)
     {
         free((void *)pkt);
     }
+}
+
+void layer_convert(const struct raw_layer *in, struct layer *out)
+{
+    if (in == NULL || out == NULL)
+    {
+        return;
+    }
+
+    out->proto = in->proto;
+    out->header_len = in->hdr_len;
+    out->payload_len = in->pld_len;
+    out->header.raw = in->hdr_ptr;
+    out->payload = in->pld_ptr;
 }