[libnetfilter_queue] extra data after payload

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Hi,

when reading queue data via the recv() function
then one gets a return value much longer than the payload data,
so there are some extra data after the payload.
What kind of extra data is it?

for example:
  rv  = recv(fd, buf, sizeof(buf), 0);   // rv=84
  ...
  ret = nfq_get_payload(tb, &data);      // ret=40 (ie. ip + tcp pkt, both w/o options, and tcp w/o user data)

So, here, what are the extra 44 bytes after the tcp data?

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