netdev - Re: bpf filter : support for vlan tag

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Date:	Tue, 16 Oct 2012 13:00:43 +0200
From:	Daniel Borkmann <danborkmann@...earbox.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ani Sinha <ani@...stanetworks.com>, netdev@...r.kernel.org
Subject: Re: bpf filter : support for vlan tag

On Tue, Oct 16, 2012 at 8:46 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Mon, 2012-10-15 at 19:10 -0700, Ani Sinha wrote:
>> Hi :
>>
>> I was looking at the kernel side implementation of the BPF filter. I
>> do not see any code that supports filtering of packets based on
>> provided vlan tag information from the skbuff. This will make it
>> impossible to provide any filter to tcpdump that will filter packets
>> based on the tag information if libpcap uses the kernel filter.
>>
>> Any help will be much appreciated.
>
> Right, we need a basic support, using a new ancillary definition.
>
> Is the following patch enough to address your need, or do you also need
> access to vlan_tx_tag_present() ?

I like this patch, it's especially useful to speed up processing for
packet analyzers. vlan_tx_tag_present() might also be good to have if
this doesn't waste to much room for future ancillary operations.
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