netdev - Re: [PATCH net-next] tun: Add ability to create tun device with given index

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Message-ID: <20130613095248.68c52109@nehalam.linuxnetplumber.net>
Date:	Thu, 13 Jun 2013 09:52:48 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tun: Add ability to create tun device with
 given index

On Thu, 13 Jun 2013 14:04:54 +0400
Pavel Emelyanov <xemul@...allels.com> wrote:

> Tun devices cannot be created with ifidex user wants, but it's
> required by checkpoint-restore project.
> 
> Long time ago such ability was implemented for rtnl_ops-based
> interface for creating links (9c7dafbf net: Allow to create links
> with given ifindex), but the only API for creating and managing 
> tuntap devices is ioctl-based and is evolving with adding new ones
> (cde8b15f tuntap: add ioctl to attach or detach a file form tuntap
> device).
> 
> Following that trend, here's how a new ioctl that sets the ifindex
> for device, that _will_ be created by TUNSETIFF ioctl looks like.
> So those who want a tuntap device with the ifindex I, should open
> the tun device, call ioctl(fd, TUNSETIFINDEX, I), then call TUNSETIFF.
> If setifindex is not called, then it will be generated as before.
> 
> Is it OK to extend ioctls with this, or should we rather switch the
> whole tuntap driver on full-featured rtln-ops?
> 
> Signed-off-by: Pavel Emelyanov <xemul@...allels.com>
> 

I see no check for the most fundamental thing, the ifindex must be unique!
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