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Date:   Tue, 3 Sep 2019 22:55:09 +0200
From:   Pablo Neira Ayuso <pablo@netfilter.org>
To:     Florian Westphal <fw@strlen.de>
Cc:     Leonardo Bras <leonardo@linux.ibm.com>,
        netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
        bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Jozsef Kadlecsik <kadlec@netfilter.org>,
        Roopa Prabhu <roopa@cumulusnetworks.com>,
        Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6
 and ipv6 module is disabled
Message-ID: <20190903205509.y6bus5gw4jdw5d7l@salvia>
References: <20190830181354.26279-1-leonardo@linux.ibm.com>
 <20190830181354.26279-2-leonardo@linux.ibm.com>
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 <99e3ef9c5ead1c95df697d49ab9cc83a95b0ac7c.camel@linux.ibm.com>
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 <20190903170550.GA13660@breakpoint.cc>
 <20190903193155.v74ws47zcn6zrwpr@salvia>
 <20190903194809.GD13660@breakpoint.cc>
 <20190903201904.npna6dt25ug5gwvd@salvia>
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On Tue, Sep 03, 2019 at 10:35:31PM +0200, Florian Westphal wrote:
> Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > On Tue, Sep 03, 2019 at 09:48:09PM +0200, Florian Westphal wrote:
> > > We could do that from nft_do_chain_netdev().
> > 
> > Indeed, this is all about the netdev case.
> > 
> > Probably add something similar to nf_ip6_route() to deal with
> > ip6_route_lookup() case? This is the one trigering the problem, right?
> 
> Yes, this particular problem is caused by ipv6 fib not being
> initialized due to ipv6.disable=1.  I don't know if there are cases
> other than FIB.
> 
> > BTW, how does nft_fib_ipv6 module kicks in if ipv6 module is not
> > loaded? The symbol dependency would pull in the IPv6 module anyway.
> 
> ipv6.disabled=1 does load the ipv6 module, but its non-functional.

I see, thanks for explaining.