netdev - Re: ping (iputils) review (call for help)

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Date:   Thu, 3 Nov 2022 11:43:36 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     Petr Vorel <pvorel@...e.cz>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Michal Kubecek <mkubecek@...e.cz>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vasiliy Kulikov <segoon@...nwall.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: ping (iputils) review (call for help)

On Thu, Nov 3, 2022 at 7:30 AM Petr Vorel <pvorel@...e.cz> wrote:
>
> Hi,
>
> I'm sorry to bother you about userspace. I'm preparing new iputils release and
> I'm not sure about these two patches.  As there has been many regressions,
> review from experts is more than welcome.
>
> If you have time to review them, it does not matter if you post your
> comments/RBT in github or here (as long as you keep Cc me so that I don't
> overlook it).
>
> BTW I wonder if it make sense to list Hideaki YOSHIFUJI as NETWORKING
> IPv4/IPv6 maintainer. If I'm not mistaken, it has been a decade since he was active.
>
> * ping: Call connect() before sending/receiving
> https://github.com/iputils/iputils/pull/391
> => I did not even knew it's possible to connect to ping socket, but looks like
> it works on both raw socket and on ICMP datagram socket.
The workaround of not using the PING socket is:

# sysctl -w net.ipv4.ping_group_range="1 0"

>
> * ping: revert "ping: do not bind to device when destination IP is on device
> https://github.com/iputils/iputils/pull/396
> => the problem has been fixed in mainline and stable/LTS kernels therefore I
> suppose we can revert cc44f4c as done in this PR. It's just a question if we
> should care about people who run new iputils on older (unfixed) kernels.
cc44f4c has also caused some regression though it's only seen in the
kselftests, and that is why I made the kernel fix. I don't know which
regression is more serious regardless of the patch's correctness. :-).
or can we put some changelog to say that this revert should be
backported together with the kernel commit?

Thanks.