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: <20190903194809.GD13660@breakpoint.cc>
Date:   Tue, 3 Sep 2019 21:48:09 +0200
From:   Florian Westphal <fw@...len.de>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Florian Westphal <fw@...len.de>,
        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

Pablo Neira Ayuso <pablo@...filter.org> wrote:
> > > I was expecting we could find a way to handle this from br_netfilter
> > > alone itself.
> > 
> > We can't because we support ipv6 fib lookups from the netdev family
> > as well.
> > 
> > Alternative is to auto-accept ipv6 packets from the nf_tables eval loop,
> > but I think its worse.
> 
> Could we add a restriction for nf_tables + br_netfilter + !ipv6. I
> mean, if this is an IPv6 packet, nf_tables is on and IPv6 module if
> off, then drop this packet?

We could do that from nft_do_chain_netdev().