netdev - Re: [RFC PATCH] ipsec: fix IPv4 AH alignment on 32 bits

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Date:	Fri, 21 Jan 2011 20:20:21 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@...nd.com
Cc:	netdev@...r.kernel.org, christophe.gouault@...nd.com
Subject: Re: [RFC PATCH] ipsec: fix IPv4 AH alignment on 32 bits

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Thu, 13 Jan 2011 18:20:19 +0100

> here is a patch to fix alignment of IPv4 AH. Note that this break
> compatiblity for some algorithms (like SHA256) with old kernels
> ... but upstream cannot use SHA256 on IPv4, for example, with a target
> that is RFC compliant.
> 
> I don't know what is the best way to fix this.

We cannot just start rejecting the old 8-byte alignment on input if
Linux has been using an 8-byte alignment since day one.

If you want this change to be considered seriously, you need to relax
the AH4 input check.
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