netdev - Re: [PATCH bpf-next v3 7/9] net/netfilter: Add unstable CT lookup helpers for XDP and TC-BPF

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Date:   Sat, 11 Dec 2021 20:16:28 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Florian Westphal <fw@...len.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 7/9] net/netfilter: Add unstable CT lookup
 helpers for XDP and TC-BPF

On Sat, Dec 11, 2021 at 07:35:58PM +0100, Toke Høiland-Jørgensen wrote:
> Pablo Neira Ayuso <pablo@...filter.org> writes:
> 
> > On Fri, Dec 10, 2021 at 09:01:29PM +0530, Kumar Kartikeya Dwivedi wrote:
> >> On Fri, Dec 10, 2021 at 08:39:14PM IST, Pablo Neira Ayuso wrote:
> >> > On Fri, Dec 10, 2021 at 06:32:28PM +0530, Kumar Kartikeya Dwivedi wrote:
> >> > [...]
> >> > >  net/netfilter/nf_conntrack_core.c | 252 ++++++++++++++++++++++++++++++
> >> > >  7 files changed, 497 insertions(+), 1 deletion(-)
> >> > >
> >> > [...]
> >> > > diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> >> > > index 770a63103c7a..85042cb6f82e 100644
> >> > > --- a/net/netfilter/nf_conntrack_core.c
> >> > > +++ b/net/netfilter/nf_conntrack_core.c
> >> >
> >> > Please, keep this new code away from net/netfilter/nf_conntrack_core.c
> >> 
> >> Ok. Can it be a new file under net/netfilter, or should it live elsewhere?
> >
> > IPVS and OVS use conntrack for already quite a bit of time and they
> > keep their code in their respective folders.
> 
> Those are users, though.

OK, I see this as a yet user of the conntrack infrastructure.

> This is adding a different set of exported functions, like a BPF
> version of EXPORT_SYMBOL(). We don't put those outside the module
> where the code lives either...

OVS and IPVS uses Kconfig to enable the conntrack module as a
dependency. Then, add module that is loaded when conntrack is used.

> I can buy not wanting to bloat nf_conntrack_core.c, but what's the
> problem with adding a net/netfilter_nf_conntrack_bpf.c that gets linked
> into the same kmod?

I might be missing the reason why this can't be done in
self-contained way here.