netdev - Re: [PATCH net-next v2 3/4] net: check tunnel option type in tunnel flags

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Date:   Wed, 27 Jun 2018 11:49:49 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>, davem@...emloft.net,
        jbenc@...hat.com
Cc:     Roopa Prabhu <roopa@...ulusnetworks.com>, jiri@...nulli.us,
        jhs@...atatu.com, xiyou.wangcong@...il.com,
        oss-drivers@...ronome.com, netdev@...r.kernel.org,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>
Subject: Re: [PATCH net-next v2 3/4] net: check tunnel option type in tunnel
 flags

On 06/27/2018 06:39 AM, Jakub Kicinski wrote:
> From: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> 
> Check the tunnel option type stored in tunnel flags when creating options
> for tunnels. Thereby ensuring we do not set geneve, vxlan or erspan tunnel
> options on interfaces that are not associated with them.
> 
> Make sure all users of the infrastructure set correct flags, for the BPF
> helper we have to set all bits to keep backward compatibility.
> 
> Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> ---
> CC: Daniel Borkmann <daniel@...earbox.net>
> 
> v2:
>  - use __be16 for dst_opt_type in net/openvswitch/flow_netlink.c (build bot).

Looks good to me, and yes in BPF case a mask like TUNNEL_OPTIONS_PRESENT is
right approach since this is opaque info and solely defined by the BPF prog
that is using the generic helper.

Thanks,
Daniel