netdev - Re: netstat and dual stack sockets

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Message-ID: <CAPh34mdX2YuqMVY8Adjnaa4CET2xaMJafQ2mLgck6sOo0Nq3xQ@mail.gmail.com>
Date:	Mon, 15 Jun 2015 23:36:54 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	netdev <netdev@...r.kernel.org>
Subject: Re: netstat and dual stack sockets

On 15 June 2015 at 22:54, Phil Sutter <phil@....cc> wrote:

> As I see it, a user has no way of detecting the listening socket in this
> address family: it does not show in /proc/net/{tcp,udp} nor do
> 'netstat', 'ss' or 'lsof' print any additional information about those
> sockets over pure IPv6 ones.

Probably a combination of IPV6_V6ONLY(1, 0) and IN6_IS_ADDR_V4MAPPED
fulfills all user requirements, ... so far. Your proposal is to hand
over sk->sk_ipv6only?

Hagen
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