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Date:	Tue, 10 Apr 2007 13:02:10 +0200
From:	Johannes Berg <>
To:	Patrick McHardy <>
Cc:	"Eric W. Biederman" <>,
	David Miller <>,,,,,,,,
Subject: Re: [PATCH] net: Add etun driver

On Tue, 2007-04-10 at 12:46 +0200, Patrick McHardy wrote:

> Not totally different, so far I think we should use the same attributes
> as for RTM_SETLINK messages and include the device-specific stuff in
> IFLA_PROTINFO, which is symetric to what the kernel sends in RTM_NETLINK
> messages (see br_netlink.c for an example). The easiest case would be an
> empty IFLA_PROTINFO attribute, which would simply create a device
> without any configuration.

I'll have to look up these things.

> The main advantage that we don't get more weird sysfs/proc/ioctl based
> interfaces

Please don't put me into a corner I don't want to be in ;) The new
wireless stuff was completely designed using netlink. The sysfs
interface to these two specific things was a concession since it used to
exist before and we don't really have a fully functional userspace tool

>  and use the same interface that is used for all other network
> configuration, which f.e. will allow to add support for all software
> devices to iproute without much effort, so you don't need 30 different
> tools for configuring the different software device types anymore.
> Additionally we get atomic setup/dumps and extensibility.

I don't think wireless can get away without a new tool. So much stuff
there. Look at;a=blob;f=include/linux/nl80211.h;hb=HEAD


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