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 19:35:58 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     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

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. 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...

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?

-Toke