netdev - Re: [PATCH v2 2/5] bpf: Add a bpf_sock_from

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Message-ID: <20201119233127.pvaisojjos75tpo2@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 19 Nov 2020 15:31:44 -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 v2 2/5] bpf: Add a bpf_sock_from_file helper

On Thu, Nov 19, 2020 at 05:26:51PM +0100, Florent Revest wrote:
> From: Florent Revest <revest@...gle.com>
> 
> While eBPF programs can check whether a file is a socket by file->f_op
> == &socket_file_ops, they cannot convert the void private_data pointer
> to a struct socket BTF pointer. In order to do this a new helper
> wrapping sock_from_file is added.
> 
> This is useful to tracing programs but also other program types
> inheriting this set of helpers such as iterators or LSM programs.
Acked-by: Martin KaFai Lau <kafai@...com>