From: "U.Mutlu" <for-gmane@mutluit.com>
To: netfilter-devel@vger.kernel.org
Subject: [libnetfilter_queue] extra data after payload
Date: Fri, 23 Sep 2011 18:19:32 +0200 [thread overview]
Message-ID: <j5ibim$sen$1@dough.gmane.org> (raw)
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?
next reply other threads:[~2011-09-23 16:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-23 16:19 U.Mutlu [this message]
2011-09-23 17:02 ` [libnetfilter_queue] extra data after payload U.Mutlu
2011-09-23 17:17 ` Jeff Haran
2011-09-24 8:08 ` U.Mutlu
2011-09-24 8:24 ` Jan Engelhardt
2011-09-26 17:45 ` Jeff Haran
2011-09-26 18:58 ` U.Mutlu
2011-09-26 20:22 ` U.Mutlu
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