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Date:   Thu, 28 Apr 2022 20:15:17 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Maxim Mikityanskiy <maximmi@...dia.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH bpf-next v7 1/6] bpf: Use ipv6_only_sock in bpf_tcp_gen_syncookie

On Thu, Apr 28, 2022 at 8:38 AM Maxim Mikityanskiy <maximmi@...dia.com> wrote:
>
> Instead of querying the sk_ipv6only field directly, use the dedicated
> ipv6_only_sock helper.
>
> Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
> Reviewed-by: Tariq Toukan <tariqt@...dia.com>
> Acked-by: John Fastabend <john.fastabend@...il.com>
> Acked-by: Lorenz Bauer <lmb@...udflare.com>
> Acked-by: Petar Penkov <ppenkov@...gle.com>
> ---
>  net/core/filter.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 8847316ee20e..207a13db5c80 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -7099,7 +7099,7 @@ BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
>          */
>         switch (((struct iphdr *)iph)->version) {
>         case 4:
> -               if (sk->sk_family == AF_INET6 && sk->sk_ipv6only)
> +               if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk))
>                         return -EINVAL;

Please rebase patches before resending.

Applying: bpf: Use ipv6_only_sock in bpf_tcp_gen_syncookie
Using index info to reconstruct a base tree...
M    net/core/filter.c
Falling back to patching base and 3-way merge...
Auto-merging net/core/filter.c
No changes -- Patch already applied.
Applying: bpf: Fix documentation of th_len in bpf_tcp_{gen,check}_syncookie
Applying: bpf: Allow helpers to accept pointers with a fixed size
Applying: bpf: Add helpers to issue and check SYN cookies in XDP
error: sha1 information is lacking or useless (include/uapi/linux/bpf.h).
error: could not build fake ancestor
Patch failed at 0004 bpf: Add helpers to issue and check SYN cookies in XDP


Also trim your cc. You keep sending to addresses that are bouncing
(Lorenz's and Petar's).

Remove their Ack-s too or fix them with correct emails.

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