netdev - Re: [PATCH net-next] tcp: Fix build break when CONFIG

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Date:   Tue, 22 Nov 2022 08:42:49 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Jamie Bainbridge <jamie.bainbridge@...il.com>
Subject: Re: [PATCH net-next] tcp: Fix build break when CONFIG_IPV6=n

On Tue, Nov 22, 2022 at 1:37 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Saeed,
>
> On Tue, Nov 22, 2022 at 10:31 AM Saeed Mahameed <saeed@...nel.org> wrote:
> > From: Saeed Mahameed <saeedm@...dia.com>
> >
> > The cited commit caused the following build break when CONFIG_IPV6 was
> > disabled
> >
> > net/ipv4/tcp_input.c: In function ‘tcp_syn_flood_action’:
> > include/net/sock.h:387:37: error: ‘const struct sock_common’ has no member named ‘skc_v6_rcv_saddr’; did you mean ‘skc_rcv_saddr’?
> >
> > Fix by using inet6_rcv_saddr() macro which handles this situation
> > nicely.
> >
> > Fixes: d9282e48c608 ("tcp: Add listening address to SYN flood message")
> > Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
>
> Thanks for your patch!
>
> > --- a/net/ipv4/tcp_input.c
> > +++ b/net/ipv4/tcp_input.c
> > @@ -6843,9 +6843,9 @@ static bool tcp_syn_flood_action(const struct sock *sk, const char *proto)
> >
> >         if (!READ_ONCE(queue->synflood_warned) && syncookies != 2 &&
> >             xchg(&queue->synflood_warned, 1) == 0) {
> > -               if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) {
> > +               if (sk->sk_family == AF_INET6) {
>
> I think the IS_ENABLED() should stay, to make sure the IPV6-only
> code is optimized away when IPv6-support is disabled.

Agreed.