From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7BA36175A92; Thu, 23 Apr 2026 18:50:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776970249; cv=none; b=A0W2yfDRJIUYzeQu7BPejsyTbP2fKe6OIkCRN6270ATt/Oo+bWoJtFzG0xCFygN3Ab6DCYiTWUwqVcLl8Kz1KsBVfciA10mDdH7xu0u9YLpd2Xe1CqJJFRbbaoUvWdxNZfTJv2qxWmEbcZ1n1Abgfo+6slfzSg7YGbBRL/yg/wc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776970249; c=relaxed/simple; bh=kWDjwQlBj4v1pkAPxjWyhoeDS4gp+4fQfqYuYQX5Bqg=; h=Content-Type:MIME-Version:Subject:From:Message-Id:Date:References: In-Reply-To:To:Cc; b=TQrJRFipchiiLt6qnI1f8izOdXP3G+5cpuyN4NYd8ba6VAaHRYA56a4ZabPOO0vMjQtoaAUR+q93YMbroJ8wMKrMZId7Cs/Xnd4fFyWR/hTEfHaiTEG0leUhKsm9C0VDFIgGJCpHw+bPMvAe/g2ijpFL1TXfR4H4/jUUXmVA+Kg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=U3p5NYr8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="U3p5NYr8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 286E6C2BCAF; Thu, 23 Apr 2026 18:50:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776970249; bh=kWDjwQlBj4v1pkAPxjWyhoeDS4gp+4fQfqYuYQX5Bqg=; h=Subject:From:Date:References:In-Reply-To:To:Cc:From; b=U3p5NYr8X29gwxS6PN++wJoFR+ajfxFV30Oi/IsM1tiPrsNfNUaGDaOnJZ1+HoXje 5lQgqGfdRMbOQgX6+bVGPCZvnGqYl2v+IreNW8MRasjqA8upDMdY9arHScG7W0LDx8 068HD5L/Rk2fJQtvBAI8/BzyQmmyoseLdT94dXCkOciYj8qZx3XIwluES9LLN9KKh6 pMsTFQpabOyQcJG+sAB/0Xi3dFweWv4fpy90OJZQ0ILmuokXzleNfKoqrME5a4SEFn 0zlwiHzdLj4ZPAm5iCJD2r639YZglAFCXaSVBawtuLJjEBtJdJC0dAJgzdHHQAUDSZ Qee3JUQYqKYZA== Received: from [10.30.226.235] (localhost [IPv6:::1]) by aws-us-west-2-korg-oddjob-rhel9-1.codeaurora.org (Postfix) with ESMTP id B9E4B3809A90; Thu, 23 Apr 2026 18:50:11 +0000 (UTC) Content-Type: text/plain; charset="utf-8" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH net v3 0/2] tcp: symmetric challenge ACK for SEG.ACK > SND.NXT From: patchwork-bot+netdevbpf@kernel.org Message-Id: <177697021030.714464.4327737324079505525.git-patchwork-notify@kernel.org> Date: Thu, 23 Apr 2026 18:50:10 +0000 References: <20260422123605.320000-1-jiayuan.chen@linux.dev> In-Reply-To: <20260422123605.320000-1-jiayuan.chen@linux.dev> To: Jiayuan Chen Cc: netdev@vger.kernel.org, edumazet@google.com, ncardwell@google.com, kuniyu@google.com, davem@davemloft.net, dsahern@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Hello: This series was applied to netdev/net.git (main) by Jakub Kicinski : On Wed, 22 Apr 2026 20:35:37 +0800 you wrote: > Commit 354e4aa391ed ("tcp: RFC 5961 5.2 Blind Data Injection Attack > Mitigation") quotes RFC 5961 Section 5.2 in full, which requires > that any incoming segment whose ACK value falls outside > [SND.UNA - MAX.SND.WND, SND.NXT] MUST be discarded and an ACK sent > back. Linux currently sends that challenge ACK only on the lower > edge (SEG.ACK < SND.UNA - MAX.SND.WND); on the symmetric upper edge > (SEG.ACK > SND.NXT) the segment is silently dropped with > SKB_DROP_REASON_TCP_ACK_UNSENT_DATA. > > [...] Here is the summary with links: - [net,v3,1/2] tcp: send a challenge ACK on SEG.ACK > SND.NXT https://git.kernel.org/netdev/net/c/42726ec644cb - [net,v3,2/2] selftests/net: packetdrill: cover RFC 5961 5.2 challenge ACK on both edges https://git.kernel.org/netdev/net/c/cf94b3c0f052 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html