linux-kernel - Re: [PATCH bpf-next v4 5/6] bpf: Add an iterator selftest for bpf_sk_storage

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Message-ID: <20201204013917.32ctfr2jcy5lr5md@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 3 Dec 2020 17:39:22 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Florent Revest <revest@...omium.org>
CC:     <bpf@...r.kernel.org>, <viro@...iv.linux.org.uk>,
        <davem@...emloft.net>, <kuba@...nel.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <yhs@...com>, <andrii@...nel.org>,
        <kpsingh@...omium.org>, <revest@...gle.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v4 5/6] bpf: Add an iterator selftest for
 bpf_sk_storage_get

On Wed, Dec 02, 2020 at 09:55:26PM +0100, Florent Revest wrote:
> The eBPF program iterates over all files and tasks. For all socket
> files, it stores the tgid of the last task it encountered with a handle
> to that socket. This is a heuristic for finding the "owner" of a socket
> similar to what's done by lsof, ss, netstat or fuser. Potentially, this
> information could be used from a cgroup_skb/*gress hook to try to
> associate network traffic with processes.
> 
> The test makes sure that a socket it created is tagged with prog_tests's
> pid.
Acked-by: Martin KaFai Lau <kafai@...com>