netdev - Re: [PATCH 0/12] L2 network namespace (v3)

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Message-ID: <45AE4A8B.6000206@fr.ibm.com>
Date:	Wed, 17 Jan 2007 17:10:51 +0100
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Dmitry Mishin <dim@...nvz.org>
CC:	containers@...ts.osdl.org, alexey@...ru, saw@...ru,
	Andrew Morton <akpm@...l.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 0/12] L2 network namespace (v3)

Dmitry Mishin wrote:
> This is an update of L2 network namespaces patches. They are applicable
> to Cedric's 2.6.20-rc4-mm1-lxc2 tree. 
> 
> Changes:
> 	- updated to 2.6.20-rc4-mm1-lxc2
> 	- current network context is per-CPU now
> 	- fixed compilation without CONFIG_NET_NS
> 
> Changed current context definition should fix all mentioned by Cedric issues:
> 	- the nsproxy backpointer is unnecessary now - thus removed; 
> 	- the push_net_ns() and pop_net_ns() use per-CPU variable now;
> 	- there is no race on ->nsproxy between push_net_ns() and
> 	  exit_task_namespaces() because they deals with differrent pointers.
> 
> ===================================
> L2 network namespaces
> 
> The most straightforward concept of network virtualization is complete
> separation of namespaces, covering device list, routing tables, netfilter
> tables, socket hashes, and everything else.
> 
> On input path, each packet is tagged with namespace right from the
> place where it appears from a device, and is processed by each layer
> in the context of this namespace.
> Non-root namespaces communicate with the outside world in two ways: by
> owning hardware devices, or receiving packets forwarded them by their parent
> namespace via pass-through device.
> 
> This complete separation of namespaces is very useful for at least two
> purposes:
>   - allowing users to create and manage by their own various tunnels and
>     VPNs, and
>   - enabling easier and more straightforward live migration of groups of
>     processes with their environment.

Great ! Thanks Dmitry.
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