netdev - Re: [Devel] Re: [RFD] L2 Network namespace infrastructure

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Date:	Wed, 27 Jun 2007 18:39:54 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Patrick McHardy <kaber@...sh.net>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeff Garzik <jeff@...zik.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	netdev@...r.kernel.org, jamal <hadi@...erus.ca>,
	Linux Containers <containers@...ts.osdl.org>,
	Ben Greear <greearb@...delatech.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [Devel] Re: [RFD] L2 Network namespace infrastructure

Patrick McHardy wrote:
> Eric W. Biederman wrote:
> 
>>-- The basic design
>>
>>There will be a network namespace structure that holds the global
>>variables for a network namespace, making those global variables
>>per network namespace.
>>
>>One of those per network namespace global variables will be the
>>loopback device.  Which means the network namespace a packet resides
>>in can be found simply by examining the network device or the socket
>>the packet is traversing.
>>
>>Either a pointer to this global structure will be passed into
>>the functions that need to reference per network namespace variables
>>or a structure that is already passed in (such as the network device)
>>will be modified to contain a pointer to the network namespace
>>structure.
> 
> 
> 
> I believe OpenVZ stores the current namespace somewhere global,
> which avoids passing the namespace around. Couldn't you do this
> as well?

yes, we store a global namespace context on current
(can be stored in per-cpu as well).

do you prefer this way?

Thanks,
Kirill

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