netdev - Re: [PATCH net-next] trace: tcp: Add tracepoint for tcp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANn89iLybqJ22LVy00KUOVscRr8GQ88AcJ3Oy9MjBUgN=or0jA@mail.gmail.com>
Date: Mon, 24 Feb 2025 20:03:57 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Breno Leitao <leitao@...ian.org>
Cc: Neal Cardwell <ncardwell@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, "David S. Miller" <davem@...emloft.net>, 
	David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, kernel-team@...a.com, 
	yonghong.song@...ux.dev
Subject: Re: [PATCH net-next] trace: tcp: Add tracepoint for tcp_sendmsg()

On Mon, Feb 24, 2025 at 7:24 PM Breno Leitao <leitao@...ian.org> wrote:
>
> Add a lightweight tracepoint to monitor TCP sendmsg operations, enabling
> the tracing of TCP messages being sent.
>
> Meta has been using BPF programs to monitor this function for years,
> indicating significant interest in observing this important
> functionality. Adding a proper tracepoint provides a stable API for all
> users who need visibility into TCP message transmission.
>
> The implementation uses DECLARE_TRACE instead of TRACE_EVENT to avoid
> creating unnecessary trace event infrastructure and tracefs exports,
> keeping the implementation minimal while stabilizing the API.
>
> Given that this patch creates a rawtracepoint, you could hook into it
> using regular tooling, like bpftrace, using regular rawtracepoint
> infrastructure, such as:
>
>         rawtracepoint:tcp_sendmsg_tp {
>                 ....
>         }

I would expect tcp_sendmsg() being stable enough ?

kprobe:tcp_sendmsg {
}