code: def nla_for_each_nested(nla, rem):
      
      pos = nlattr(nla_data(nla))
      rem.value = nla_len(nla)
      while nla_ok(pos, rem):
          yield pos
          pos = nla_next(pos, rem)
docs: Iterate over a stream of nested attributes.
  
      https://github.com/thom311/libnl/blob/libnl3_2_25/include/netlink/attr.h#L274
  
      Positional arguments:
      nla -- attribute containing the nested attributes (nlattr class instance).
      rem -- initialized to len, holds bytes currently remaining in stream (c_int).
  
      Returns:
      Generator yielding nlattr instances.