netdev - Re: RFC: net 00/05: routing based send-to-self implementation

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Message-ID: <4B1427ED.6070808@candelatech.com>
Date:	Mon, 30 Nov 2009 12:15:41 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Benjamin LaHaise <bcrl@...et.ca>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: RFC: net 00/05: routing based send-to-self implementation

On 11/30/2009 12:04 PM, Benjamin LaHaise wrote:
> On Mon, Nov 30, 2009 at 11:37:31AM -0800, Ben Greear wrote:
>> This doesn't work if you want to have one application manage lots of
>> interfaces and send traffic between these interfaces.  Certainly there are
>> use-cases that can use multiple name-spaces, but it's nice to have the
>> option not to use them as well.
>
> Actually, it's quite doable from within one application.  An application
> I recently adapted to make use of multiple network namespaces within a single
> process by way of pthreads and unshare(CLONE_NEWNET).  The scheme I used
> is to just open the socket in a new namespace in a thread.  Since the
> file descriptor table is still shared, it's easy to send/receive data from
> any other thread, regardless of which virtual network namespace it's in.
> All told, setting up virtual routers with namespaces is pretty easy.

That still sounds more complicated than the proposed routing table changes,
at least for my application.  Since I also want to gather stats, set/watch routes,
etc, on each network device, would I have to keep a thread and netlink socket
running in each name-space in order to see the various devices?

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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