netdev - Re: [PATCH net-next v2 2/2] Add a eBPF helper function to retrieve socket uid

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Date:   Sun, 05 Feb 2017 19:02:01 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Chenbo Feng <chenbofeng.kernel@...il.com>
Cc:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: Re: [PATCH net-next v2 2/2] Add a eBPF helper function to retrieve
 socket uid

On Sun, 2017-02-05 at 18:17 -0800, Chenbo Feng wrote:
> From: Chenbo Feng <fengc@...gle.com>
> 
> Returns the owner uid of the socket inside a sk_buff. This is useful to
> perform per-UID accounting of network traffic or per-UID packet
> filtering.
> 
> Signed-off-by: Chenbo Feng <chenbofeng.kernel@...il.com>
> ---
> +BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
> +{
> +	struct sock *sk = skb->sk;
> +	kuid_t kuid = sock_net_uid(net, sk && sk_fullsock(sk) ?
> +				   sk : NULL);
> +	return (u32)kuid.val;
> +}
> +

Have you considered to use sk_to_full_sk() ?

struct sock *sk = sk_to_full_sk(skb->sk);
kuid_t kuid = sock_net_uid(net, sk);