netdev - Re: [PATCH 1/3] [IPV6]: Event type in addrconf

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Message-Id: <20080323.031724.208377895.davem@davemloft.net>
Date:	Sun, 23 Mar 2008 03:17:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	den@...nvz.org
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org, kaber@...sh.net,
	containers@...ts.osdl.org, dlezcano@...ibm.com,
	benjamin.thery@...l.net
Subject: Re: [PATCH 1/3] [IPV6]: Event type in addrconf_ifdown is mis-used.

From: "Denis V. Lunev" <den@...nvz.org>
Date: Sun, 23 Mar 2008 11:13:16 +0300

> First, this behaviour is broken for a namespace right now in the 2.6.26
> tree. inet6_dev pointer will be NULL for a loopback inside the
> namespace. The case is simple. Just remove all INET6 addresses from a
> loopback device inside a VE. This will call
>   inet6_addr_del
>     addrconf_ifdown(dev, 1);
>        if (dev == init_net.loopback_dev && how == 1)
>                 how = 0;
> the condition will be false and how will not be changed here.

That's a bug.

You can't mark any namespace's loopback device's inet6_dev as NULL
until you know that all routes, devices, and packets referring to such
devices and routes in that namespace are %100 gone and unreferenced.

It is now obviously apparent that there are several severe errors
here.
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