docs: def nl_list_entry(ptr, type_, member):
      """https://github.com/thom311/libnl/blob/libnl3_2_25/include/netlink/list.h#L64."""
      if ptr.container_of:
          return ptr.container_of
      null_data = type_()
      setattr(null_data, member, ptr)
      return null_data