linux-kernel - Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled

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Message-ID: <20190903205509.y6bus5gw4jdw5d7l@salvia>
Date:   Tue, 3 Sep 2019 22:55:09 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Florian Westphal <fw@...len.de>
Cc:     Leonardo Bras <leonardo@...ux.ibm.com>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6
 and ipv6 module is disabled

On Tue, Sep 03, 2019 at 10:35:31PM +0200, Florian Westphal wrote:
> Pablo Neira Ayuso <pablo@...filter.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.