linux-kernel - Re: [PATCH nf-next v4 1/2] netfilter: Make IP6_NF_IPTABLES

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Message-ID: <20240829162512.GA14214@breakpoint.cc>
Date: Thu, 29 Aug 2024 18:25:12 +0200
From: Florian Westphal <fw@...len.de>
To: Breno Leitao <leitao@...ian.org>
Cc: fw@...len.de, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	David Ahern <dsahern@...nel.org>, rbc@...a.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	"open list:NETFILTER" <coreteam@...filter.org>
Subject: Re: [PATCH nf-next v4 1/2] netfilter: Make IP6_NF_IPTABLES_LEGACY
 selectable

Breno Leitao <leitao@...ian.org> wrote:
> This option makes IP6_NF_IPTABLES_LEGACY user selectable, giving
> users the option to configure iptables without enabling any other
> config.

I don't get it.

IP(6)_NF_IPTABLES_LEGACY without iptable_filter, mangle etc.
is useless, rules get attached to basechains that get registered
by the iptable_{mangle,filter,nat,...} modules, i.e. those that
"select IP(6)_NF_IPTABLES_LEGACY".

The old get/setsockopt UAPI is useless without them, iptables -L, -A,
etc. won't work.

What am I missing?

I'm fine with this because this is needed anyway to allow
disabling the get/setsockopt api (needs the 'depends on' changes
though) later, but this change is a mystery to me.