linux-kernel - Re: [PATCH net-next] netfilter: fix NETFILTER_XT_TARGET

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Date:   Fri, 6 Jul 2018 17:54:02 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Máté Eckl <ecklm94@...il.com>,
        Fernando Fernandez Mancera <ffmancera@...eup.net>,
        "Pablo M. Bermudo Garay" <pablombg@...il.com>,
        Felix Fietkau <nbd@....name>, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] netfilter: fix NETFILTER_XT_TARGET_TEE
 dependencies

On Fri, Jul 06, 2018 at 03:05:13PM +0200, Arnd Bergmann wrote:
> On Fri, Jul 6, 2018 at 2:48 PM, Pablo Neira Ayuso <pablo@...filter.org> wrote:
> > On Fri, Jul 06, 2018 at 02:45:42PM +0200, Pablo Neira Ayuso wrote:
> >> On Fri, Jul 06, 2018 at 02:37:58PM +0200, Arnd Bergmann wrote:
> >> > With NETFILTER_XT_TARGET_TEE=y and IP6_NF_IPTABLES=m, we get a link
> >> > error when referencing the NF_DUP_IPV6 module:
> >> >
> >> > net/netfilter/xt_TEE.o: In function `tee_tg6':
> >> > xt_TEE.c:(.text+0x14): undefined reference to `nf_dup_ipv6'
> >> >
> >> > The problem here is the 'select NF_DUP_IPV6 if IP6_NF_IPTABLES'
> >> > that forces NF_DUP_IPV6 to be =m as well rather than setting it
> >> > to =y as was intended here. Adding a soft dependency on
> >> > IP6_NF_IPTABLES avoids that broken configuration.
> >>
> >> Applied to nf.git, thanks Arnd.
> >
> > Sorry, let me reconsider.
> >
> > We many need similar patches to other spots in 35bf1ccecaaa ?
> >
> > If so, it would be good to fix in the one go.
> 
> I'm fairly sure that  NETFILTER_XT_TARGET_LOG is safe, since
> NF_LOG_IPV6 already depends on IP6_NF_IPTABLES.
> 
> NF_SOCKET_IPV6 like NF_DUP_IPV6 does not depend on
> IP6_NF_IPTABLES, so we may have a similar problem there, though
> I have not come across that. I have done only a few hundred randconfig
> builds since I started yesterday, so I may have missed something,
> but I think this is safe because CONFIG_NF_SOCKET_IPV6 is
> used like a 'bool' symbol these days, we don't actually control building
> a module with it, only a small portion in the nft_socket file.

Thanks for explaining.

Applied, thanks!