netdev - Re: arp

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Message-Id: <20150322.125458.2054837991708165397.davem@davemloft.net>
Date:	Sun, 22 Mar 2015 12:54:58 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...r.kernel.org, roland@...estorage.com
Subject: Re: arp_hash

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sun, 22 Mar 2015 22:42:04 +1100

> If the attacker can somehow get the pointer value of the device
> then all is lost since they could set any number of the low bits
> of val to zero.

This "attacker" with access to your physcial network?

I'm all for shifting the device pointer down a few bits to get more
entropy, but I don't completely agree with the rest of your
objections.

This hash function has to be as fast as possible, even jhash{,2} is
too expensive.
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