Re: add a new ->ndo_tunnel_ctl method to avoid a few set_fs calls v2

[David Miller]

From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 19 May 2020 15:03:10 +0200

> both the ipv4 and ipv6 code have an ioctl each that can be used to create
> a tunnel using code that doesn't live in the core kernel or ipv6 module.
> Currently they call ioctls on the tunnel devices to create these, for
> which the code needs to override the address limit, which is a "feature"
> I plan to get rid of.
> 
> Instead this patchset adds a new ->ndo_tunnel_ctl that can be used for
> the tunnel configuration using struct ip_tunnel_parm.  The method is
> either invoked from a helper that does the uaccess and can be wired up
> as ndo_do_ioctl method, or directly from the magic IPV4/6 ioctls that
> create tunnels with kernel space arguments.
> 
> Changes since v2:
>  - properly propagate errors in ipip6_tunnel_prl_ctl

Looks good, series applied, thanks.