From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: How do I receive vlan tags on an AF_PACKET socket in 3.4 kernel?
Date: Wed, 31 Jul 2013 08:09:30 -0700
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Cc: Ronny Meeus <ronny.meeus@gmail.com>,
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To: Daniel Borkmann <dborkman@redhat.com>
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On Wed, 2013-07-31 at 16:42 +0200, Daniel Borkmann wrote:

> You can use bpfc (git://github.com/borkmann/netsniff-ng.git), it also has
> an extensive man page. That should probably do it:
> 
> $ cat foo
> ld vlant
> jneq #4094, drop
> ret #-1
> drop: ret #0
> 
> $ bpfc foo
> { 0x20, 0, 0, 0xfffff02c },
> { 0x15, 0, 1, 0x00000ffe },
> { 0x6, 0, 0, 0xffffffff },
> { 0x6, 0, 0, 0x00000000 },

Thanks Daniel.

If the load of this BPF fails (because its an old kernel), then load
your old filter.