netdev - Re: [PATCH net-next v5 0/9] net: add support for IPv6 Segment Routing

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Date:   Thu, 10 Nov 2016 17:35:02 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     David Miller <davem@...emloft.net>
Cc:     david.lebrun@...ouvain.be,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v5 0/9] net: add support for IPv6 Segment Routing

On Thu, Nov 10, 2016 at 10:40 AM, David Miller <davem@...emloft.net> wrote:
>
> Series applied, but I wonder if using a Kconfig knob for the INLINE thing
> is overkill.

This breaks IPv6 completely if CONFIG_LWTUNNEL is disabled. When that
happens, seg6_iptunnel_init fails with EOPNOTSUPP and the stack fails
to initialize:

=====
NET: Registered protocol family 10
IPv6: Attempt to unregister permanent protocol 6
IPv6: Attempt to unregister permanent protocol 136
IPv6: Attempt to unregister permanent protocol 17
NET: Unregistered protocol family 10
=====

Not sure how to fix this. The following makes IPv6 work again, but I
suspect it mostly defeats the purpose of having SRH on by default:

+#ifdef CONFIG_LWTUNNEL
         err = seg6_iptunnel_init();
         if (err)
                 goto out_unregister_pernet;
+#endif

Enabling CONFIG_LWTUNNEL also makes IPv6 work again.

The breakage was caught by the kernel test robot, but the message was
not particularly scary:

http://marc.info/?l=linux-netdev&m=147848679207083&w=2