netdev - Disable IPv4-mapped - enforce IPV6

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Message-ID: <51278CF6.2060402@ahsoftware.de>
Date:	Fri, 22 Feb 2013 16:21:26 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	netdev@...r.kernel.org
Subject: Disable IPv4-mapped - enforce IPV6_V6ONLY

Hello,

I'm searching for a way to either enforce IPV6_V6ONLY or to block 
IPv4-mapped addresses on ipv6-sockets (e.g. by using iptables) system-wide.

E.g. net.ipv6.bindv6only doesn't help if something calls

int v6on = 0;
setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&v6on, sizeof(v6on))

In such a case I still want to disable or block IPv4-mapped addresses on 
that socket, even if the program thinks it nows it better.

Until now I haven't found a solution.

Regards,

Alexander
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