linux-kernel - Re: [PATCH] bpf: Add bpf_skb_get_sock

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Date:   Mon, 10 Aug 2020 07:56:08 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jiang Yu <jyu.jiang@...o.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        zhanglin <zhang.lin16@....com.cn>,
        Kees Cook <keescook@...omium.org>,
        Andrey Ignatov <rdna@...com>,
        Quentin Monnet <quentin@...valent.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: Re: [PATCH] bpf: Add bpf_skb_get_sock_comm() helper



On 8/10/20 6:09 AM, Jiang Yu wrote:
> skb distinguished by uid can only recorded to user who consume them.
> in many case, skb should been recorded more specific to process who
> consume them. E.g, the unexpected large data traffic of illegal process
> in metered network.
> 
> this helper is used in tracing task comm of the sock to which a skb
> belongs.
> 
> Signed-off-by: Jiang Yu <jyu.jiang@...o.com>

fd can be passed from one process to another.