netdev - Re: [RFC bpf-next v7 0/6] bpf: Force to MPTCP

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Message-ID: <20230801004323.l2npfegkq3srzff3@MacBook-Pro-8.local>
Date: Mon, 31 Jul 2023 17:43:23 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Geliang Tang <geliang.tang@...e.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Florent Revest <revest@...omium.org>,
	Brendan Jackman <jackmanb@...omium.org>,
	Matthieu Baerts <matthieu.baerts@...sares.net>,
	Mat Martineau <martineau@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	John Johansen <john.johansen@...onical.com>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Eric Paris <eparis@...isplace.org>, Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>, bpf@...r.kernel.org,
	netdev@...r.kernel.org, mptcp@...ts.linux.dev,
	apparmor@...ts.ubuntu.com, linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC bpf-next v7 0/6] bpf: Force to MPTCP

On Sat, Jul 29, 2023 at 05:57:21PM +0800, Geliang Tang wrote:
> 
> The main idea is to add a hook in sys_socket() to change the protocol id
> from IPPROTO_TCP (or 0) to IPPROTO_MPTCP.

I still think it's a hack, but its blast radius is nicely contained.
And since I cannot propose any better I'm ok with it.

Patches 1-2 can be squashed into one.
Just like patches 3-6 as a single patch for selftests.

But before proceeding I'd like an explicit ack from netdev maintainers.