netdev - Re: [PATCH bpf-next 01/14] net: Change sock_setsockopt from taking sock ptr to sk ptr

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Date:   Wed, 27 Jul 2022 10:16:28 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     bpf <bpf@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        kernel-team <kernel-team@...com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH bpf-next 01/14] net: Change sock_setsockopt from taking
 sock ptr to sk ptr

On Wed, Jul 27, 2022 at 8:09 AM Martin KaFai Lau <kafai@...com> wrote:
>
> A latter patch refactors bpf_setsockopt(SOL_SOCKET) with the
> sock_setsockopt() to avoid code duplication and code
> drift between the two duplicates.
>
> The current sock_setsockopt() takes sock ptr as the argument.
> The very first thing of this function is to get back the sk ptr
> by 'sk = sock->sk'.
>
> bpf_setsockopt() could be called when the sk does not have
> a userspace owner.  Meaning sk->sk_socket is NULL.  For example,
> when a passive tcp connection has just been established.  Thus,
> it cannot use the sock_setsockopt(sk->sk_socket) or else it will
> pass a NULL sock ptr.
>
> All existing callers have both sock->sk and sk->sk_socket pointer.
> Thus, this patch changes the sock_setsockopt() to take a sk ptr
> instead of the sock ptr.  The bpf_setsockopt() only allows
> optnames that do not require a sock ptr.
>
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---

...

> diff --git a/include/net/sock.h b/include/net/sock.h
> index f7ad1a7705e9..9e2539dcc293 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1795,7 +1795,7 @@ void sock_pfree(struct sk_buff *skb);
>  #define sock_edemux sock_efree
>  #endif
>
> -int sock_setsockopt(struct socket *sock, int level, int op,
> +int sock_setsockopt(struct sock *sk, int level, int op,
>                     sockptr_t optval, unsigned int optlen);
>

SGTM, but I feel we should rename this to sk_setsockopt() ?