netdev - Re: [PATCH v2 bpf-next 3/4] net: netfilter: add bpf_ct_set_nat

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Message-ID: <CAPhsuW5P=K7463Ka0CGxFD0BGChrEffbeO6UqReDtr80osDJLg@mail.gmail.com>
Date:   Tue, 6 Sep 2022 14:36:53 -0700
From:   Song Liu <song@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, pablo@...filter.org,
        fw@...len.de, netfilter-devel@...r.kernel.org,
        lorenzo.bianconi@...hat.com,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>
Subject: Re: [PATCH v2 bpf-next 3/4] net: netfilter: add bpf_ct_set_nat_info
 kfunc helper

On Mon, Sep 5, 2022 at 6:15 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> Introduce bpf_ct_set_nat_info kfunc helper in order to set source and
> destination nat addresses/ports in a new allocated ct entry not inserted
> in the connection tracking table yet.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  net/netfilter/nf_conntrack_bpf.c | 49 +++++++++++++++++++++++++++++++-
>  1 file changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/net/netfilter/nf_conntrack_bpf.c b/net/netfilter/nf_conntrack_bpf.c
> index 1cd87b28c9b0..85b8c7ee00af 100644
> --- a/net/netfilter/nf_conntrack_bpf.c
> +++ b/net/netfilter/nf_conntrack_bpf.c
> @@ -14,6 +14,7 @@
>  #include <net/netfilter/nf_conntrack.h>
>  #include <net/netfilter/nf_conntrack_bpf.h>
>  #include <net/netfilter/nf_conntrack_core.h>
> +#include <net/netfilter/nf_nat.h>
>
>  /* bpf_ct_opts - Options for CT lookup helpers
>   *
> @@ -134,7 +135,6 @@ __bpf_nf_ct_alloc_entry(struct net *net, struct bpf_sock_tuple *bpf_tuple,
>
>         memset(&ct->proto, 0, sizeof(ct->proto));
>         __nf_ct_set_timeout(ct, timeout * HZ);
> -       ct->status |= IPS_CONFIRMED;
>
>  out:
>         if (opts->netns_id >= 0)
> @@ -339,6 +339,7 @@ struct nf_conn *bpf_ct_insert_entry(struct nf_conn___init *nfct_i)
>         struct nf_conn *nfct = (struct nf_conn *)nfct_i;
>         int err;
>
> +       nfct->status |= IPS_CONFIRMED;
>         err = nf_conntrack_hash_check_insert(nfct);
>         if (err < 0) {
>                 nf_conntrack_free(nfct);
> @@ -424,6 +425,51 @@ int bpf_ct_change_status(struct nf_conn *nfct, u32 status)
>         return nf_ct_change_status_common(nfct, status);
>  }

Why do we need the above two changes in this patch?

Thanks,
Song