From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D751F4AC14D; Mon, 28 Sep 2026 11:24:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790594668; cv=none; b=eSV+bgF+jl5GV+y49ExHCo+dhOcKiw4KEUPzmpSRZtiM33Z6NJBaBdYF20pFThrab7por0jvVmddH7mc+Bp4pkd+Vmn/+xxSQjfd1LxTpUFVNN1R5CnsYsYspG4yz4s0vyrvI1n3Y7WRp4SNuOlmvbcfV2Fe6oXsXF8bupaonz4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790594668; c=relaxed/simple; bh=96zShvewS0FUHaZkV3Ypl0XopKvOITUxP8nkh+iwyhc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=t0cwjGLSVXYyg0typ7QZNJCVXrXaf5MWpvXGLvNpbwQmv+ahr/za6B3V0pfinyIpV61JV5ER2JFjUXkyGc3IrKanH5dXiAdIfPdxBY6JUhzmypJOzQIUZWa/mu/4apjV6CzC7t5Juo3iUaSTE2cYFeRKdY1AWQfYSJ8oJeaJe90= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TO+4cgpM; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TO+4cgpM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C7411F00898; Mon, 28 Sep 2026 11:24:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790594666; bh=Z+flXo99CE7ujWH6j+CbkZKQFDT8A/xMdJen7Hp7HEs=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=TO+4cgpMI7cf2a5cTLrlWYEyzxwFlGMfCpGu3Ij/ESyVcyhh77hhoJbDzu7OxdA00 u+YaDm0OSpMlu/bC99BpR2ptk+jdv1WHmS3N4dX02Z16jM34Z4KO34TRiBSEe8PdLb z/DJfwfBMqDJNDe5Umwwk8vDD/OWQWThon70Rh9VI6qLtcsFMmIC6mSVuNtTMPBfiy 7wqwk1lk/81LMeEEgD+Kc2wM1lpJkraL+HDZzDkmJFNMsY4DseaEE9Z6CqmOsrNpvz Ovdhusi0G+JmcW1rxHil+F36NtOVdcnseNS6CJ7AXqoXhLAwMlYKeh8RzxzXVHKVrP eRPYjTy/43YUA== Message-ID: Date: Mon, 28 Sep 2026 13:24:20 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH net-next 5/5] selftests: mptcp: convert iptables to nftables for mptcp_join.sh Content-Language: fr To: netdev-bot+sashiko@kernel.org Cc: martineau@kernel.org, geliang@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, linux-kernel@vger.kernel.org, quanyeyang@proton.me References: <20260926-net-next-mptcp-misc-feat-7-4-v1-5-67af4ab37406@kernel.org> <179058242453.3145.1450534124183352369@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit Hello, On 28/09/2026 10:00, netdev-bot+sashiko@kernel.org wrote: > Thank you for your contribution! Sashiko AI review found 2 potential > issue(s) to consider. > > Critical: 0 · High: 0 · Medium: 1 · Low: 1 > > If you believe none of the issues are legitimate, please reply to each > issue of Medium severity or higher and explain why the AI is wrong. TL;DR: It looks like there are issues with NFTables, but no new version needed here for these MPTCP patches. > If any of them are legitimate and you plan to respin, please let patchwork > know by including "pw-bot: cr" as a separate line at the end of your reply > (one such reply per series is enough). > > - [Medium] In endpoint_tests() > (tools/testing/selftests/net/mptcp/mptcp_join.sh), the new rule `tcp… > - [Low] The patch removes CONFIG_NFT_COMPAT from > tools/testing/selftests/net/mptcp/config, "since we don't need it now". > > -- > > selftests: mptcp: convert iptables to nftables for mptcp_join.sh > > This converts the iptables/ip6tables rules in mptcp_join.sh to nftables. > It keeps the same table and chain names and adds init_nftables() to set > up the tables only when a test needs them. The cBPF bytecode that matched > the ADD_ADDR and RM_ADDR suboptions is replaced with "tcp option mptcp > subtype" matching. In the config fragment, CONFIG_NFT_COMPAT is swapped > for the nft modules that are now needed. (...) >> diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh >> index 18ce7136a2b0e..b16e24418e737 100755 >> --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh >> +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh > > [ ... ] > >> @@ -4402,12 +4372,10 @@ endpoint_tests() >> >> # To make sure RM_ADDR are sent over a different subflow, but >> # allow the rest to quickly and cleanly close the subflow >> - local ipt=1 >> - ip netns exec "${ns2}" ${iptables} -I OUTPUT -s "10.0.1.2" \ >> - -p tcp -m tcp --tcp-option 30 \ >> - -m bpf --bytecode \ >> - "$CBPF_MPTCP_SUBOPTION_RM_ADDR" \ >> - -j DROP || ipt=0 >> + local nft=1 >> + ip netns exec "${ns2}" nft insert rule ip filter OUTPUT \ >> + ip saddr 10.0.1.2 meta l4proto tcp \ >> + tcp option mptcp subtype remove-addr drop || nft=0 > > [Severity: Medium] > Can this rule ever match an RM_ADDR packet on an established connection? > > nft_exthdr_tcp_eval() stops at the first TCP option whose kind matches > (30 for MPTCP). The subtype check therefore only ever sees the first > MPTCP suboption: > > net/netfilter/nft_exthdr.c:nft_exthdr_tcp_eval() { > ... > for (i = sizeof(*tcph); i < tcphdr_len - 1; i += optl) { > optl = optlen(opt, i); > > if (priv->type != opt[i]) > continue; > ... > return; > } > ... > } Indeed, the RM_ADDR will be added in a second MPTCP option. It looks like Netfilter doesn't handle that case. But that seems to be an issue on the Netfilter side, rather than with the command that should work. I will follow up with Netfilter devs. If a fix cannot be added on their side, I will change the nft command to look at a specific offset. Note that the command here is just to check there is no RM_ADDR sent on the wrong side: it shouldn't catch any packets here anyway. Cheers, Matt -- Sponsored by the NGI0 Core fund.