nb0->total_length_not_including_first_buffer = 0;
nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
nb0->total_length_not_including_first_buffer = 0;
nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));