linux-kernel - Re: [PATCH] netfilter: conntrack: add weak IPV6 dependency

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Date:   Fri, 6 Jul 2018 17:14:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Florian Westphal <fw@...len.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        "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] netfilter: conntrack: add weak IPV6 dependency

On Fri, Jul 6, 2018 at 5:00 PM, Florian Westphal <fw@...len.de> wrote:
> Arnd Bergmann <arnd@...db.de> wrote:
>> and that resulted in a new build failure:
>>
>> net/netfilter/nf_conntrack_proto.o:(.rodata+0x788): undefined
>> reference to `nf_conntrack_l4proto_icmpv6'
>> net/ipv6/netfilter/nf_conntrack_reasm.o: In function `nf_ct_frag6_expire':
>> nf_conntrack_reasm.c:(.text+0x2320): undefined reference to
>> `ip6_expire_frag_queue'
>> net/ipv6/netfilter/nf_conntrack_reasm.o: In function `nf_ct_frag6_init':
>> nf_conntrack_reasm.c:(.text+0x2384): undefined reference to `ip6_frag_init'
>> nf_conntrack_reasm.c:(.text+0x2394): undefined reference to `ip6_frag_init'
>> nf_conntrack_reasm.c:(.text+0x2398): undefined reference to `ip6_rhash_params'
>> net/ipv6/netfilter/nf_conntrack_reasm.o: In function `nf_ct_frag6_expire':
>> nf_conntrack_reasm.c:(.text+0x10bc): undefined reference to
>> `ip6_expire_frag_queue'
>>
>> I don't think we can get CONFIG_NF_DEFRAG_IPV6=y to work with IPV6=m.
>
> Yes, not with current implementation, but I still don't think this
> is unavoidable.
>
> In case this is urgent I'm fine with the patch that adds the dependency,
> otherwise I'd like to try and disentangle nf_conntrack_reasm and ipv6.

I don't think any real users depend on it, but I hit the problem quite
frequently in randconfig testing on linux-next.

       Arnd