netdev - Re: [tcpdump-workers] vlan tagged packets and libpcap breakage

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Message-ID: <CAOxq_8OnKhLMqdgj=LBiHyYwqjE82-qjcGLiUUcp14RzK8P7YA@mail.gmail.com>
Date:	Wed, 31 Oct 2012 18:22:54 -0700
From:	Ani Sinha <ani@...stanetworks.com>
To:	Guy Harris <guy@...m.mit.edu>
Cc:	netdev@...r.kernel.org,
	Francesco Ruggeri <fruggeri@...stanetworks.com>,
	tcpdump-workers@...ts.tcpdump.org
Subject: Re: [tcpdump-workers] vlan tagged packets and libpcap breakage

On Wed, Oct 31, 2012 at 5:50 PM, Guy Harris <guy@...m.mit.edu> wrote:
>
> On Oct 31, 2012, at 3:35 PM, Ani Sinha <ani@...stanetworks.com> wrote:
>
>> yes but if the packet is passed to the filter within libpcap (when we
>> are not using the kernel filter) before the reinsertion,
>
> ...that would be a bug.
>
> Currently, that bug doesn't exist in the recvfrom() code path, but *does* appear to exist in the tpacket code path - and that code path also runs the filter before the SLL header is constructed.  That should be fixed.


yes, agreed.
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