netdev - Re: switching network namespace midway

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Message-ID: <20121029072341.158e6412@nehalam.linuxnetplumber.net>
Date:	Mon, 29 Oct 2012 07:23:41 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Benjamin LaHaise <bcrl@...ck.org>, rsa <ravi.mlists@...il.com>,
	netdev@...r.kernel.org
Subject: Re: switching network namespace midway

On Sat, 27 Oct 2012 22:43:13 -0700
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> Stephen Hemminger <shemminger@...tta.com> writes:
> 
> > I noticed that the L2TP sockets are not being moved to the correct name
> > space.
> >
> > Something like this is probably needed.
> 
> This is almost right.
> 
> There needs to be a line in l2tp_tunnel_create that verifies
> the network namespace of the socket derived from a file descriptor
> and the passed in network namespace match.
> 
> For the l2tp_tunnel_sock_create case where we have a socket that is not
> exported to userspace using sk_change_net seems appropriate to avoid
> reference counting problems.  And it may be worth moving that work into
> sk_create_kern.  But we need a network namespace hook that will lookup
> all l2tp tunnel sockets when a network namespace is being destroyed and
> remove them.  I think we can hit this bug with rmmod as well.

Since I don't use netns or L2TP for real, someone else needs to take
up the crusade here.
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