linux-kernel - Re: [PATCH bpf-next v3 1/2] bpf: Fix bpf_get/setsockopt to tos not take effect when TCP over IPv4 via INET6 API

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Message-ID: <CANn89iLkmsLZHfp=K5Ho9_asVzmv03knj1n=aap9G+xhRaeBXA@mail.gmail.com>
Date: Sat, 14 Sep 2024 13:47:17 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Feng zhou <zhoufeng.zf@...edance.com>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org, 
	yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org, 
	sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net, 
	kuba@...nel.org, pabeni@...hat.com, mykolal@...com, shuah@...nel.org, 
	alan.maguire@...cle.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	yangzhenze@...edance.com, wangdongdong.6@...edance.com
Subject: Re: [PATCH bpf-next v3 1/2] bpf: Fix bpf_get/setsockopt to tos not
 take effect when TCP over IPv4 via INET6 API

On Sat, Sep 14, 2024 at 12:32 PM Feng zhou <zhoufeng.zf@...edance.com> wrote:
>
> From: Feng Zhou <zhoufeng.zf@...edance.com>
>
> when TCP over IPv4 via INET6 API, bpf_get/setsockopt with ipv4 will
> fail, because sk->sk_family is AF_INET6. With ipv6 will success, not
> take effect, because inet_csk(sk)->icsk_af_ops is ipv6_mapped and
> use ip_queue_xmit, inet_sk(sk)->tos.
>
> Bpf_get/setsockopt use sk_is_inet() helper to fix this case.
>
> Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>