netdev - Re: [PATCH 0/4] MIB: add struct net to UDP accounting macros

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Date:	Mon, 07 Jul 2008 12:19:03 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	den@...nvz.org, "Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 0/4] MIB: add struct net to UDP accounting macros

Pavel Emelyanov wrote:
> David Miller wrote:
>> From: Pavel Emelyanov <xemul@...nvz.org>
>> Date: Fri, 04 Jul 2008 15:58:44 +0400
>>
>>> This is the first small set of MIB statistics netnsization. The easiest
>>> case is UDP stats, so I started with this one. If this set is accepted,
>>> I will go on step-by-step with adding struct net to all the other stats' 
>>> accounting macros, then SNMP_XXX ones and finish with a set than will put 
>>> the stats on the struct net and fix appropriate proc files.
>>>
>>> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
>>> Acked-by: Denis V. Lunev <den@...nvz.org>
>> Applied, thanks Pavel.
>>
>> Are we going to provide some way for an administrator to fetch
>> stats from the perspective of all namespaces?  I know the idea
>> is seperation with this stuff, but admins are going to want
>> something like that.
> 
> Well, if we want to get the stats for each namespace separately, then
> this ability is already present. Since this statistics is shown via the
> /proc/net files and the /proc/net itself is seen via the /proc/<pid>/net,
> then we can walk the init-s of all the containers in the system and dump
> this info.
> 
> The problem that is to be solved with this approach is how to get these
> init-s :) But since finding any namespace by some task living in it is a
> common practice now (netdev moving, sys_hijack) this one will be solved.
> 
> BTW, are there some plans about implementing some netlink-based fetcher
> of this statistics? If so, then I think it's worth making this engine
> namespaces aware from the very beginning.


Shouldn't be interesting to handle the network namespaces directly with 
the iproute command ?

  * ip netns add <name>
  * ip netns del <name>
  * ip netns <oldname> set name <newname>
  * ip netns show

When a network namespace is created via clone|unshare, the name is 
automatically the pid of the creator.

In order to track the namespace, we can add an entry in /proc/net (aka 
/proc/<pid>/net) named "name" which contains the name of the namespace.
I heard Eric is thinking about a netnsfs.

 From a larger perspective, the iproute command with a new "netns" 
subcommand can be enhanced to have more features, for example the freeze 
and resume for the network.

  * ip netns set down <name>
  * ip netns set up <name>

So having the netns binded, we can plug the known subcommand (link, ip, 
...) with the netns features. For examples:

  * ip addr add 1.2.3.4/24 dev eth0 netns foo






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