From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: rules matching ipv6 prefix addrs
Date: Wed, 03 Nov 2010 08:37:44 +0100
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References: <20101102.135254.226783976.davem@davemloft.net>
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Cc: netfilter-devel@vger.kernel.org
To: David Miller <davem@davemloft.net>
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On 02.11.2010 21:52, David Miller wrote:
> 
> H. Peter Anvin just mentioned something interesting to me,
> basically it's the fact that when your prefix addresses
> change on an interface in ipv6, this can invalidate your
> netfilter rules.
> 
> So it would be nice if there were some way to match "the
> ipv6 prefix address on interface X", and through some
> kind of caching this could be optimized so it wouldn't
> really cost anything.
> 
> Thoughts?

Perhaps something similar to the IPv4 addrtype match would work?
Basically it allows you to match on inet_addr_type() of the source
or destination address.