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

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Message-ID: <87a9ufu7gb.fsf@xmission.com>
Date:	Sat, 17 Nov 2012 15:37:40 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Daniel Borkmann <danborkmann@...earbox.net>
Cc:	Michael Richardson <mcr@...delman.ca>,
	tcpdump-workers@...ts.tcpdump.org,
	Ani Sinha <ani@...stanetworks.com>, netdev@...r.kernel.org,
	Francesco Ruggeri <fruggeri@...stanetworks.com>
Subject: Re: [tcpdump-workers] vlan tagged packets and libpcap breakage

Daniel Borkmann <danborkmann@...earbox.net> writes:

> Speaking of netsniff-ng where we don't reconstruct VLAN headers, users
> have reported that depending on the NIC/driver resp. ethtool setting,
> they can come in stripped or not (in the pf_packet's rx_ring buffer).
> However, I assume VLAN AUXDATA is always consistent (and so the
> BPF/BPF JIT filtering).

Yes it was a mess before we added software stripping of the vlan headers
a year ago.

Eric
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