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

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Date:   Fri, 6 Jul 2018 15:55:16 +0200
From:   Florian Westphal <fw@...len.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        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, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: conntrack: add weak IPV6 dependency

Arnd Bergmann <arnd@...db.de> wrote:
> Now that the conntrack module contains code for ipv6, we can no longer
> have it built-in while IPv6 itself is a loadable module:
> 
> net/netfilter/nf_conntrack_proto.o: In function `nf_ct_netns_do_get':
> nf_conntrack_proto.c:(.text+0x88c): undefined reference to `nf_defrag_ipv6_enable'

AFAICS this is caused by

CONFIG_NF_CONNTRACK=y
CONFIG_IPV6=m
CONFIG_NF_DEFRAG_IPV6=m

This is exported via nf_defrag_ipv6.ko.

nf_defrag_ipv6 has an ipv6 dependency, but i think it might be avoidable
so this would work:

CONFIG_NF_CONNTRACK=y
CONFIG_NF_DEFRAG_IPV6=y
CONFIG_IPV6=m