netdev - Re: [PATCH] xfrm: fix inbound ipv4/udp/esp packets to UDPv6 dualstack sockets

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Message-ID: <CANP3RGdWDSmvBDsSEWXf+9u_8KQRBzr8NcQCjHB_DPMa83B6PQ@mail.gmail.com>
Date:   Thu, 27 Oct 2022 10:52:03 +0900
From:   Maciej Żenczykowski <zenczykowski@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Linux Network Development Mailing List <netdev@...r.kernel.org>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH] xfrm: fix inbound ipv4/udp/esp packets to UDPv6 dualstack sockets

On Thu, Oct 27, 2022 at 10:24 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Wed, 26 Oct 2022 17:42:37 +0900 Maciej Żenczykowski wrote:
> > I'll admit that so far I've only tested that the code builds.
>
> For _a_ definition of builds ;)
>
> ERROR: modpost: "xfrm4_udp_encap_rcv" [net/ipv6/ipv6.ko] undefined!

Oh, it does build - it even boots.

egrep 'XFRM|ESP' .config | egrep -v 'is not set'

CONFIG_NAMESPACES=y
CONFIG_X86_ESPFIX64=y
CONFIG_XFRM=y
CONFIG_XFRM_ALGO=y
CONFIG_XFRM_ESP=y
CONFIG_INET6_ESP=y

Looking at the Kconfigs/Makefiles, perhaps you have ipv6 as a module?
Why would you do that ;-)
I don't think my development systems even support booting with ipv6
modularized...