netdev - Re: network interfaces called "all", "default" or "config"

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Message-ID: <53CFCD26.1020409@infradead.org>
Date:	Wed, 23 Jul 2014 07:56:38 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Stephane Chazelas <stephane.chazelas@...il.com>,
	linux-kernel@...r.kernel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: network interfaces called "all", "default" or "config"

[adding netdev]

On 07/23/2014 04:33 AM, Stephane Chazelas wrote:
> Hiya,
> 
> you may want to forbid the creation of interfaces whose name is
> one of the special files in /proc/net and /proc/sys.
> 
> I can see some characters (like space, tab, newline, slash,
> dot...) are alread forbidden in interface names (EINVAL), but
> one can do for instance:
> 
> sudo ip link add link eth0 all type vlan id 2
> sudo ip link add link eth0 default type vlan id 3
> sudo ip link add link eth0 config type vlan id 4
> 
> Interestingly, after you add a "all" or "default", the
> corresponding /proc/sys/net/ipv[46]/conf/(all|default) become
> empty, and remain so even after you've removed the interface.
> 
> Adding an interface called "config" masks /proc/net/vlan/config
> 
> (tested with 3.14-1-amd64 on debian)
> 


-- 
~Randy
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