netdev - Re: switching network namespace midway

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Message-ID: <87a9v47qsl.fsf@xmission.com>
Date:	Mon, 29 Oct 2012 17:21:46 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	James Chapman <jchapman@...alix.com>
Subject: Re: switching network namespace midway

Stephen Hemminger <shemminger@...tta.com> writes:

> 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.

Let's see if James Chapman is interested.  I don't use L2TP for real either.

James are you at all interested in the network namespace bugs that have
been found in the l2tp code?

Eric



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