netdev - Re: [PATCH 8/8] net: Implement socketat.

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Message-ID: <m1bp797p4h.fsf@fess.ebiederm.org>
Date:	Mon, 04 Oct 2010 12:07:58 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	hadi@...erus.ca
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.osdl.org>,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Ulrich Drepper <drepper@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	David Miller <davem@...emloft.net>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Ben Greear <greearb@...delatech.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 8/8] net: Implement socketat.

jamal <hadi@...erus.ca> writes:

> One thing still confuses me...
> The app control point is in namespace0. I still want to be able to
> "boot" namespaces first and maybe a few seconds later do a socketat()...
> and create devices, tcp sockets etc. I suspect create_ns(namespace-name)
> would involve:
>      * open /proc/self/ns/net (namespace-name)
>      * unshare the netns
> Is this correct?

Almost.

create should be:
        * verify namespace-name is not already in use
        * mkdir -p /var/run/netns/<namespace-name>
	* unshare the netns
        * mount --bind /proc/self/ns/net /var/run/netns/<namespace-name>

Are you talking about an replacing something that used to use the linux
vrf patches that are floating around?

Eric
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