linux-kernel - Re: [PATCH v9 net-next 16/23] net/tcp: Ignore specific ICMPs for TCP-AO connections

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Message-ID: <CANn89i+eUrn6tzQBNQjywyS-rsqm_uamJRdfP0-o_Pz2Dv1t8A@mail.gmail.com>
Date:   Thu, 10 Aug 2023 18:36:33 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     David Ahern <dsahern@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dan Carpenter <error27@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Donald Cassidy <dcassidy@...hat.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        "Gaillardetz, Dominik" <dgaillar@...na.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Leonard Crestez <cdleonard@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        "Tetreault, Francois" <ftetreau@...na.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v9 net-next 16/23] net/tcp: Ignore specific ICMPs for
 TCP-AO connections

On Thu, Aug 10, 2023 at 6:27 PM Dmitry Safonov <dima@...sta.com> wrote:
>
> On 8/8/23 14:43, Eric Dumazet wrote:
> > On Wed, Aug 2, 2023 at 7:27 PM Dmitry Safonov <dima@...sta.com> wrote:
> [..]
> >>
> >> +bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code)
> >
> > const struct sock *sk ?
>
> Well, I can't really: atomic64_inc(&ao->counters.dropped_icmp)

I think we could, because this would still work.

 struct tcp_ao_info *ao; // This is rw object

ao = rcu_dereference(tcp_sk(sk)->ao_info);

This helper looks to accept unlocked sockets, so marking them const
would avoid mistakes in the future.