netdev - Re: How do I receive vlan tags on an AF

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Message-ID: <1375283370.10515.100.camel@edumazet-glaptop>
Date:	Wed, 31 Jul 2013 08:09:30 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	Ronny Meeus <ronny.meeus@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: How do I receive vlan tags on an AF_PACKET socket in 3.4 kernel?

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.



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