Subject: Re: [PATCH net-next] tcp: Fix tcp_syn_flood_action() if CONFIG_IPV6=n

From: Jakub Kicinski <[email-masked]>
Date: Mon, 21 Nov 2022 19:52:11 -0800

On Mon, 21 Nov 2022 14:44:19 -0800 Saeed Mahameed wrote:
> there's a macro inet6_rcv_saddr(sk), we can use it instead of directly
> referencing &sk->sk_v6_rcv_saddr, it already handles the case where 
> CONFIG_IPV6=n
> 
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -6845,7 +6845,7 @@ static bool tcp_syn_flood_action(const struct sock *sk, const char *proto)
>              xchg(&queue->synflood_warned, 1) == 0) {
>                  if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) {
>                          net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",
> -                                       proto, &sk->sk_v6_rcv_saddr,
> +                                       proto, inet6_rcv_saddr(sk),

Great, could you post a full patch? I haven't seen v2, now it's almost
Thanksgiving..