netdev - Re: [PATCH] tcp: Add listening address to SYN flood message

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Message-ID: <CANn89i+HgJu_mRptWY85aVBS_gTEaeM+0HPpmw1qcx7vme8YSw@mail.gmail.com>
Date:   Thu, 10 Nov 2022 15:46:02 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Jamie Bainbridge <jamie.bainbridge@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: Add listening address to SYN flood message

On Thu, Nov 10, 2022 at 3:39 PM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Thu, 10 Nov 2022 21:21:06 +1100
> Jamie Bainbridge <jamie.bainbridge@...il.com> wrote:
>
> > +         xchg(&queue->synflood_warned, 1) == 0) {
> > +#if IS_ENABLED(CONFIG_IPV6)
> > +             if (sk->sk_family == AF_INET6) {
> > +                     net_info_ratelimited("%s: Possible SYN flooding on port %d. IP %pI6c. %s.  Check SNMP counters.\n",
> > +                                     proto, sk->sk_num,
> > +                                     &sk->sk_v6_rcv_saddr, msg);
> > +             } else
> > +#endif
> > +             {
> > +                     net_info_ratelimited("%s: Possible SYN flooding on port %d. IP %pI4. %s.  Check SNMP counters.\n",
> > +                                     proto, sk->sk_num, &sk->sk_rcv_saddr, msg);
> > +             }
> > +     }
> >
>
> Port number is unsigned not signed.
> Message also seems overly wordy to me.

Also, it is customary to use  IP.port format (like most tools, see tcpdump)