netdev - Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while creating kernel sockets

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Message-ID: <CAHA+R7N4w4B_2GZfNfxinqPAHPqHEQo__TKt3m88fyHzerEj2g@mail.gmail.com>
Date:	Fri, 8 May 2015 13:27:32 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Ying Xue <ying.xue@...driver.com>,
	netdev <netdev@...r.kernel.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>, maxk@....qualcomm.com,
	Stephen Hemminger <stephen@...workplumber.org>,
	Thomas Graf <tgraf@...g.ch>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Tom Herbert <tom@...bertland.com>,
	James Chapman <jchapman@...alix.com>,
	Erik Hugne <erik.hugne@...csson.com>, jon.maloy@...csson.com,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while
 creating kernel sockets

On Fri, May 8, 2015 at 10:36 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> It really is invalid for a network namespace init routine to grab the
> reference count of it's network namespace (thus making the network
> namespace unfreeable).  So I am wondering if perhaps all we need to do
> is find a clean refactoring of the socket code so this case does not
> come up at all.


Good point!

I _guess_ the reason is these kernel sockets have to exist longer than
netns' life-time, it could be due to on-flying skb's?

On the other hand, we do create some fb_tunnel netdevice in netns init
too, but we don't take a refcnt there, probably because we wait
for netdevice refcnt goes to zero when unregistering.
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