netdev - Re: [PATCH 2/2] ipv4: Use universal hash for ARP.

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Message-ID: <CAL1RGDWXqnL4zzcfV_kj=R2P148JcVB2X2QUV90__+e5zUH-cQ@mail.gmail.com>
Date:	Wed, 13 Jul 2011 10:59:08 -0700
From:	Roland Dreier <roland@...estorage.com>
To:	David Miller <davem@...emloft.net>
Cc:	johnwheffner@...il.com, mj@....cz, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] ipv4: Use universal hash for ARP.

On Mon, Jul 11, 2011 at 1:48 AM, David Miller <davem@...emloft.net> wrote:
> +static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
> +{
> +       u32 val = key ^ dev->ifindex;
> +
> +       return val * hash_rnd;
> +}

OK, I suggested this, and there's nothing obviously wrong with it.

But I would hope that someone actually vetted that this provides
enough variation between different hash_rnd values to avoid hash
chain attacks.

 - R.
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