netdev - Re: csum offload and af

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Message-Id: <20080811.175154.168708843.davem@davemloft.net>
Date:	Mon, 11 Aug 2008 17:51:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	rusty@...tcorp.com.au, anthony@...emonkey.ws,
	netdev@...r.kernel.org
Subject: Re: csum offload and af_packet

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 12 Aug 2008 08:32:44 +0800

> On Mon, Aug 11, 2008 at 11:50:25PM +1000, Rusty Russell wrote:
> >
> > I think this is deeper than that.  This case is actually unusual, in that the 
> > packet really does arrive with a partial csum.  But usually, we're exposing 
> > an internal detail of our stack at this point.  Seems like we shouldn't if we 
> > know the user can't deal with it.  dhcpd just makes this case less academic.
> 
> I disagree.  If you're using AF_PACKET you're asking to see the
> bare details.  If you want to see the censored version you can
> always go through the IP stack.

Unfortunately the censored version doesn't allow you to get at the
link level headers, which is what at least some of these applications
want.
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