netdev - Re: RFC: New BGF 'LOOP' instruction

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Message-Id: <20100803.001904.63020040.davem@davemloft.net>
Date:	Tue, 03 Aug 2010 00:19:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	leonerd@...nerd.org.uk
Cc:	netdev@...r.kernel.org, hagen@...u.net
Subject: Re: RFC: New BGF 'LOOP' instruction

From: Paul LeoNerd Evans <leonerd@...nerd.org.uk>
Date: Tue, 3 Aug 2010 08:07:10 +0100

> On Mon, Aug 02, 2010 at 10:18:13PM -0700, David Miller wrote:
>> 1) The limiting scheme will make legitimate scripts USELESS
> 
> Rightnow, BPF is all but useless for parsing, say, IPv6. I only pick
> IPv6 as one example, I'm sure there must exist a great number more
> packet-based protocols that use a "linked-list" style approach to
> headers. None of those are currently filterable on the current set of
> instructions. LOOP would allow these.

It's not meant for detailed packet protocol header analysis,
it's for stateless straight line matching of masked values
in packet headers.

Nothing more.
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