netdev - Re: [PATCH net-next v2] Add uid and cookie bpf helper to cg_skb_func

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Message-ID: <20170415014143.GA80213@ast-mbp.thefacebook.com>
Date:   Fri, 14 Apr 2017 18:41:45 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Chenbo Feng <chenbofeng.kernel@...il.com>
Cc:     netdev@...r.kernel.org, Lorenzo Colitti <lorenzo@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: Re: [PATCH net-next v2] Add uid and cookie bpf helper to
 cg_skb_func_proto

On Fri, Apr 14, 2017 at 06:25:26PM -0700, Chenbo Feng wrote:
> From: Chenbo Feng <fengc@...gle.com>
> 
> BPF helper functions get_socket_cookie and get_socket_uid can be
> used for network traffic classifications, among others. Expose
> them also to programs of type BPF_PROG_TYPE_CGROUP_SKB. As of
> commit 8f917bba0042 ("bpf: pass sk to helper functions") the
> required skb->sk function is available at both cgroup bpf ingress
> and egress hooks. With these two new helper, cg_skb_func_proto is
> effectively the same as sk_filter_func_proto.
> 
> Change since V1:
> Instead of add the helper to cg_skb_func_proto, redirect the
> cg_skb_func_proto to sk_filter_func_proto since all helper function
> in sk_filter_func_proto are applicable to cg_skb_func_proto now.
> 
> Signed-off-by: Chenbo Feng <fengc@...gle.com>

Thanks!
Acked-by: Alexei Starovoitov <ast@...nel.org>