netdev - Re: [PATCH v2] net: inet_diag: always export IPV6

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Message-Id: <20150710.232548.357031018488272501.davem@davemloft.net>
Date:	Fri, 10 Jul 2015 23:25:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	phil@....cc
Cc:	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH v2] net: inet_diag: always export IPV6_V6ONLY sockopt
 for listening sockets

From: Phil Sutter <phil@....cc>
Date: Fri, 10 Jul 2015 11:39:57 +0200

> Reconsidering my commit 20462155 "net: inet_diag: export IPV6_V6ONLY
> sockopt", I am not happy with the limitations it causes for socket
> analysing code in userspace. Exporting the value only if it is set makes
> it hard for userspace to decide whether the option is not set or the
> kernel does not support exporting the option at all.
> 
> From an auditor's perspective, the interesting question for listening
> AF_INET6 sockets is: "Does it NOT have IPV6_V6ONLY set?" Because it is
> the unexpected case. This patch allows to answer this question reliably.
> 
> Signed-off-by: Phil Sutter <phil@....cc>
> Cc: Eric Dumazet <edumazet@...gle.com>

Applied, thanks.
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