netdev - Re: [PATCH net-next] filter: add XOR instruction for use with X/K

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Date:	Mon, 24 Sep 2012 15:43:48 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Borkmann <dxchgb@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] filter: add XOR instruction for use with X/K

On Mon, 2012-09-24 at 14:23 +0200, Daniel Borkmann wrote:
> BPF_S_ANC_ALU_XOR_X has been added a while ago, but as an 'ancillary'
> operation that is invoked through a negative offset in K within BPF
> load operations. Since BPF_MOD has recently been added, BPF_XOR should
> also be part of the common ALU operations. Removing BPF_S_ANC_ALU_XOR_X
> might not be an option since this is exposed to user space.

Please note we dont expose BPF_S_ANC_ALU_XOR_X to user space.

We expose SKF_AD_ALU_XOR_X instead.

But it seems easier to leave it to keep this patch small (not touching
various JIT implementations, even if followup are welcomed)

Acked-by: Eric Dumazet <edumazet@...gle.com>


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