netdev - Re: netfilter/iptables and network interface names

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Date:	Thu, 4 Feb 2010 15:29:01 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Thomas Woerner <twoerner@...hat.com>
cc:	netdev@...r.kernel.org,
	Netfilter Developer Mailing List 
	<netfilter-devel@...r.kernel.org>
Subject: Re: netfilter/iptables and network interface names

On Thursday 2010-02-04 13:58, Thomas Woerner wrote:

> Hello,
>
> I just fell over network interface definitions in kernel and
> netfilter/iptables.
>
> Interfaces names in the kernel have few limits: Only spaces and slashes are not
> allowed, but everything else, even Ctrl characters are.
>
> In iptables, there are other limits: Colon, exclamation mark and asterisk are
> not allowed. The plus is treated special for matching. But what will be matched
> if the interface starts with or contains a plus?
>
> iptables allows to use interfaces containing spaces and slashes. iptables-save
> is not escaping interface names. The interface "+" will be treated as no
> interface limit at all and will be dropped, therefore all interfaces match.
>
> I think there should be some discussion about interface names and limits in
> kernel and netfilter/iptables.
>
> What do you think?

I think we should cc netdev for a start.
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