+/* Callback type for post-processing the vlib trace buffer */
+struct vlib_main_t;
+struct vlib_trace_main_t;
+typedef void (vlib_trace_buffer_callback_t) (struct vlib_main_t *,
+ struct vlib_trace_main_t *);
+
+/* Callback type for alternate handling of vlib_add_trace internals */
+struct vlib_node_runtime_t;
+struct vlib_buffer_t;
+typedef void *(vlib_add_trace_callback_t) (struct vlib_main_t *,
+ struct vlib_node_runtime_t * r,
+ struct vlib_buffer_t * b,
+ u32 n_data_bytes);
+