+u8 *format_vnet_buffer_flags (u8 * s, va_list * args) __attribute__ ((weak));
+u8 *
+format_vnet_buffer_flags (u8 * s, va_list * args)
+{
+ s = format (s, "BUG STUB %s", __FUNCTION__);
+ return s;
+}
+
+u8 *format_vnet_buffer_opaque (u8 * s, va_list * args) __attribute__ ((weak));
+u8 *
+format_vnet_buffer_opaque (u8 * s, va_list * args)
+{
+ s = format (s, "BUG STUB %s", __FUNCTION__);
+ return s;
+}
+
+u8 *format_vnet_buffer_opaque2 (u8 * s, va_list * args)
+ __attribute__ ((weak));
+u8 *
+format_vnet_buffer_opaque2 (u8 * s, va_list * args)
+{
+ s = format (s, "BUG STUB %s", __FUNCTION__);
+ return s;
+}
+
+static u8 *
+format_buffer_metadata (u8 * s, va_list * args)
+{
+ vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
+
+ s = format (s, "flags: %U\n", format_vnet_buffer_flags, b);
+ s = format (s, "current_data: %d, current_length: %d\n",
+ (i32) (b->current_data), (i32) (b->current_length));
+ s = format (s, "current_config_index: %d, flow_id: %x, next_buffer: %x\n",
+ b->current_config_index, b->flow_id, b->next_buffer);
+ s = format (s, "error: %d, ref_count: %d, buffer_pool_index: %d\n",
+ (u32) (b->error), (u32) (b->ref_count),
+ (u32) (b->buffer_pool_index));
+ s = format (s,
+ "trace_handle: 0x%x, len_not_first_buf: %d\n",
+ b->trace_handle, b->total_length_not_including_first_buffer);
+ return s;
+}
+
+#define A(x) vec_add1(vm->pcap_buffer, (x))
+