netdev - Re: [PATCH RFC,net-next 0/3] ip_tunnel: specify tunnel type via template

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Date:   Thu, 4 Oct 2018 12:13:57 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        roopa@...ulusnetworks.com, amir@...ai.me, pshelar@....org,
        u9012063@...il.com
Subject: Re: [PATCH RFC,net-next 0/3] ip_tunnel: specify tunnel type via
 template

On Thu,  4 Oct 2018 02:03:42 +0200, Pablo Neira Ayuso wrote:
> Hi,
> 
> The following patchset adds a new field to the tunnel metadata template
> to restrict the configuration to a given tunnel driver. Currently, a
> misconfiguration may result in packets going to the wrong tunnel driver.
> 
> Although we have the tunnel option flags, they are not mandatory for
> some tunnel drivers, eg. vxlan, which may use it or not; and gre which
> does not use them.

Option flags are necessary because interpretation of option blob is
entirely protocol-specific.

> This patch updates tc's tunnel action and netfilter's tunnel extension
> to use this new field. OVS netlink interface has been left unset, although they
> could be updated to use this.
> 
> By extending the existing tc action to support the IP_TUNNEL_INFO_BRIDGE
> mode, I think it should be possible to expose IP_TUNNEL_TYPE_VLAN too,
> although this patchset doesn't address this scenario.
> 
> The field is initialized to zero, which maps to IP_TUNNEL_TYPE_UNSPEC to
> retain the existing behaviour, so the existing flexibility is still in
> place while this new feature is added.
> 
> Cc'ing people that git annotate show as dealing with these bits more
> recently.

What practical scenario are you trying to address here?  Have you seen
https://www.mail-archive.com/netdev@vger.kernel.org/msg250705.html
?