netdev - Re: [PATCH bpf 1/2] flow_dissector: Fix to use new variables for port ranges in bpf hook

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Date:   Fri, 17 Jan 2020 10:50:12 +0900
From:   Yoshiki Komachi <komachi.yoshiki@...il.com>
To:     Petar Penkov <ppenkov.kernel@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf 1/2] flow_dissector: Fix to use new variables for port
 ranges in bpf hook

2020年1月17日(金) 2:45 Petar Penkov <ppenkov.kernel@...il.com>:
>
> On Thu, Jan 16, 2020 at 1:13 AM Yoshiki Komachi
> <komachi.yoshiki@...il.com> wrote:
> >
> > This patch applies new flag (FLOW_DISSECTOR_KEY_PORTS_RANGE) and
> > field (tp_range) to BPF flow dissector to generate appropriate flow
> > keys when classified by specified port ranges.
> >
> > Fixes: 8ffb055beae5 ("cls_flower: Fix the behavior using port ranges with hw-offload")
> > Signed-off-by: Yoshiki Komachi <komachi.yoshiki@...il.com>
> > ---
> >  net/core/flow_dissector.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> > index 2dbbb03..06bbcc3 100644
> > --- a/net/core/flow_dissector.c
> > +++ b/net/core/flow_dissector.c
> > @@ -876,10 +876,17 @@ static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
> >                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
> >         }
> >
> > -       if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) {
> > +       if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
> >                 key_ports = skb_flow_dissector_target(flow_dissector,
> >                                                       FLOW_DISSECTOR_KEY_PORTS,
> >                                                       target_container);
> > +       else if (dissector_uses_key(flow_dissector,
> > +                                   FLOW_DISSECTOR_KEY_PORTS_RANGE))
> > +               key_ports = skb_flow_dissector_target(flow_dissector,
> > +                                                     FLOW_DISSECTOR_KEY_PORTS_RANGE,
> > +                                                     target_container);
> > +
> > +       if (key_ports) {
>
> If the flow dissector uses neither FLOW_DISSECTOR_KEY_PORTS_RANGE, nor
> FLOW_DISSECTOR_KEY_PORTS, I believe key_ports would be used
> uninitialized here. We should probably explicitly set it to NULL at
> the top of this function.

Thank you for kind comments.
I will fix it, and submit the next version later.

Best regards,

--
Yoshiki Komachi

> >                 key_ports->src = flow_keys->sport;
> >                 key_ports->dst = flow_keys->dport;
> >         }
> > --
> > 1.8.3.1
> >