netdev - Re: [PATCHv3 net-next 5/5] net: move the nat function to nf_nat

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Date:   Wed, 7 Dec 2022 21:37:29 -0500
From:   Xin Long <lucien.xin@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     network dev <netdev@...r.kernel.org>, dev@...nvswitch.org,
        davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Pravin B Shelar <pshelar@....org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>, Florian Westphal <fw@...len.de>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Oz Shlomo <ozsh@...dia.com>, Paul Blakey <paulb@...dia.com>,
        Ilya Maximets <i.maximets@....org>,
        Eelco Chaudron <echaudro@...hat.com>,
        Aaron Conole <aconole@...hat.com>,
        Saeed Mahameed <saeed@...nel.org>
Subject: Re: [PATCHv3 net-next 5/5] net: move the nat function to nf_nat_ovs
 for ovs and tc

On Tue, Dec 6, 2022 at 10:32 PM Xin Long <lucien.xin@...il.com> wrote:
>
> On Tue, Dec 6, 2022 at 6:54 PM Pablo Neira Ayuso <pablo@...filter.org> wrote:
> >
> > On Tue, Dec 06, 2022 at 06:31:16PM -0500, Xin Long wrote:
> > [...]
> > > diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
> > > index 1d4db1943936..0976d34b1e5f 100644
> > > --- a/net/netfilter/Makefile
> > > +++ b/net/netfilter/Makefile
> > > @@ -54,6 +54,12 @@ obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
> > >
> > >  nf_nat-y     := nf_nat_core.o nf_nat_proto.o nf_nat_helper.o
> > >
> > > +ifdef CONFIG_OPENVSWITCH
> > > +nf_nat-y += nf_nat_ovs.o
> > > +else ifdef CONFIG_NET_ACT_CT
> > > +nf_nat-y += nf_nat_ovs.o
> > > +endif
> >
> > Maybe add CONFIG_NF_NAT_OVS and select it from OPENVSWITCH Kconfig
> > (select is a hammer, but it should be fine in this case since
> > OPENVSWITCH already depends on NF_NAT?).
> not really completely depends, it's:
>
>   depends on (!NF_NAT || NF_NAT)
>
> but it's fine, the select will be:
>
>   select NF_NAT_OVS if NF_NAT
>
> >
> > Then in Makefile:
> >
> > nf_nat-$(CONFIG_NF_NAT_OVS)  += nf_nat_ovs.o
> >
> > And CONFIG_NF_NAT_OVS depends on OPENVSWITCH.
> Sounds great!
> Then it will be:
>
> --- a/net/netfilter/Kconfig
> +++ b/net/netfilter/Kconfig
> @@ -459,6 +459,10 @@ config NF_NAT_REDIRECT
>  config NF_NAT_MASQUERADE
>         bool
>
> +config NF_NAT_OVS
> +       bool
> +       depends on OPENVSWITCH || NET_ACT_CT
> +
Just FYI, "depends on" is not necessary in this case.
Even without this "depends on OPENVSWITCH || NET_ACT_CT",
it will still be disabled automatically if OPENVSWITCH and
NET_ACT_CT are disabled, and you can't enable it manually either.

Thanks.

>
> --- a/net/netfilter/Makefile
> +++ b/net/netfilter/Makefile
> @@ -59,6 +59,7 @@ obj-$(CONFIG_NF_LOG_SYSLOG) += nf_log_syslog.o
>  obj-$(CONFIG_NF_NAT) += nf_nat.o
>  nf_nat-$(CONFIG_NF_NAT_REDIRECT) += nf_nat_redirect.o
>  nf_nat-$(CONFIG_NF_NAT_MASQUERADE) += nf_nat_masquerade.o
> +nf_nat-$(CONFIG_NF_NAT_OVS)  += nf_nat_ovs.o
>
> --- a/net/openvswitch/Kconfig
> +++ b/net/openvswitch/Kconfig
> @@ -15,6 +15,7 @@ config OPENVSWITCH
>         select NET_MPLS_GSO
>         select DST_CACHE
>         select NET_NSH
> +       select NF_NAT_OVS if NF_NAT
>
> --- a/net/sched/Kconfig
> +++ b/net/sched/Kconfig
> @@ -977,6 +977,7 @@ config NET_ACT_TUNNEL_KEY
>  config NET_ACT_CT
>         tristate "connection tracking tc action"
>         depends on NET_CLS_ACT && NF_CONNTRACK && (!NF_NAT || NF_NAT)
> && NF_FLOW_TABLE
> +       select NF_NAT_OVS if NF_NAT
>
>
> I will prepare v4, Thanks.