netdev - Re: [Patch bpf-next v8 10/16] sock: introduce sk->sk_prot->psock_update_sk

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Date:   Fri, 02 Apr 2021 12:16:36 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        duanxiongchun@...edance.com, wangdongdong.6@...edance.com,
        jiang.wang@...edance.com, Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: Re: [Patch bpf-next v8 10/16] sock: introduce
 sk->sk_prot->psock_update_sk_prot()

On Wed, Mar 31, 2021 at 04:32 AM CEST, Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
>
> Currently sockmap calls into each protocol to update the struct
> proto and replace it. This certainly won't work when the protocol
> is implemented as a module, for example, AF_UNIX.
>
> Introduce a new ops sk->sk_prot->psock_update_sk_prot(), so each
> protocol can implement its own way to replace the struct proto.
> This also helps get rid of symbol dependencies on CONFIG_INET.
>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Jakub Sitnicki <jakub@...udflare.com>
> Cc: Lorenz Bauer <lmb@...udflare.com>
> Signed-off-by: Cong Wang <cong.wang@...edance.com>
> ---

[...]

> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 4a0478b17243..38952aaee3a1 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -2849,6 +2849,9 @@ struct proto udp_prot = {
>  	.unhash			= udp_lib_unhash,
>  	.rehash			= udp_v4_rehash,
>  	.get_port		= udp_v4_get_port,
> +#ifdef CONFIG_BPF_SYSCALL
> +	.psock_update_sk_prot	= udp_bpf_update_proto,
> +#endif
>  	.memory_allocated	= &udp_memory_allocated,
>  	.sysctl_mem		= sysctl_udp_mem,
>  	.sysctl_wmem_offset	= offsetof(struct net, ipv4.sysctl_udp_wmem_min),
> diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c
> index 7a94791efc1a..6001f93cd3a0 100644
> --- a/net/ipv4/udp_bpf.c
> +++ b/net/ipv4/udp_bpf.c
> @@ -41,12 +41,23 @@ static int __init udp_bpf_v4_build_proto(void)
>  }
>  core_initcall(udp_bpf_v4_build_proto);
>
> -struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
> +int udp_bpf_update_proto(struct sock *sk, bool restore)
>  {
>  	int family = sk->sk_family == AF_INET ? UDP_BPF_IPV4 : UDP_BPF_IPV6;
> +	struct sk_psock *psock = sk_psock(sk);
> +
> +	if (restore) {
> +		sk->sk_write_space = psock->saved_write_space;
> +		/* Pairs with lockless read in sk_clone_lock() */

Just to clarify. UDP sockets don't get cloned, so the above comment
apply.

> +		WRITE_ONCE(sk->sk_prot, psock->sk_proto);
> +		return 0;
> +	}
>
>  	if (sk->sk_family == AF_INET6)
>  		udp_bpf_check_v6_needs_rebuild(psock->sk_proto);
>
> -	return &udp_bpf_prots[family];
> +	/* Pairs with lockless read in sk_clone_lock() */
> +	WRITE_ONCE(sk->sk_prot, &udp_bpf_prots[family]);
> +	return 0;
>  }
> +EXPORT_SYMBOL_GPL(udp_bpf_update_proto);

[...]