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

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Date:   Tue, 22 Nov 2022 10:37:00 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.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

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.

>                         net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",
> -                                       proto, &sk->sk_v6_rcv_saddr,
> +                                       proto, inet6_rcv_saddr(sk),
>                                         sk->sk_num, msg);
>                 } else {
>                         net_info_ratelimited("%s: Possible SYN flooding on port %pI4:%u. %s.\n",

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds