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

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Date:   Mon, 15 Oct 2018 21:43:20 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pablo@...filter.org
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com, amir@...ai.me, pshelar@....org,
        u9012063@...il.com, daniel@...earbox.net,
        jakub.kicinski@...ronome.com
Subject: Re: [PATCH net-next 0/3] ip_tunnel: specify tunnel type via
 template

From: Pablo Neira Ayuso <pablo@...filter.org>
Date: Wed, 10 Oct 2018 00:24:36 +0200

> The following patchset adds a new field to the tunnel metadata template.
> This new field allows us to restrict the configuration to a given tunnel
> driver in order to catch incorrect configuration that may result in
> packets going to the wrong tunnel driver.
> 
> Changes with regards to initial RFC [1] are:
> 
> 1) Explicit tunnel type initialization to TUNNEL_TYPE_UNSPEC in existing
>    clients for this code, as requested by Daniel.
> 
> 2) Add TUNNEL_TYPE_* definition through enum tunnel_type in
>    uapi/linux/if_tunnel.h, so we don't need to redefine this in every
>    client of this infrastructure.
> 
> 3) Add TUNNEL_TYPE_IPIP, TUNNEL_TYPE_IPIP6 and TUNNEL_TYPE_IP6IP6, which
>    were missing in the original RFC.
> 
> Let me know if you any more comments, thanks.
> 
> [1] https://marc.info/?l=netfilter-devel&m=153861145204094&w=2

People don't need to update a core common UAPI header to add a new
ethernet driver.

They shouldn't have to do so to add a new tunneling driver either.

But that requirement is created by this patch set.