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 D9D94366809; Tue, 24 Feb 2026 08:20:25 +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=1771921225; cv=none; b=KkEtf/3lOnMkII3qL7qMQS2ZxKXDbgheBlwi0DRwvaHt3XYLLLYTQYQIZ7w3tTCME+QiiXZa3DBfYfKHbohw3n4BvgtJ8qX49Swc4gJT0GJMo0DBbJh38cFj21Rcpq2pZq7OUve0COc2DVnE/itFcrpTXWtkX+b7D4VhfXuAaQo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771921225; c=relaxed/simple; bh=iQjPg2LXKrMXc3WCOF+ndy+MkCA4NlMl9SonN6terl0=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=Z8TiuNiCVqOss7rODjxBJRzPzP19Q/pwtzOrb7egc5yXNJSBwm6FHe6u40HQM8avUziQK/CEb9Jevh5nQM+NO3IiADBKR1WJ0Fo2bI3nnr+TwuvjI+du8PlK85asWUScpc/uhClVPCu+NVLkuUEeD4QxDVuv+ieCLOQbBCSdwXI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=K579pUTO; 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="K579pUTO" Received: by smtp.kernel.org (Postfix) with ESMTPS id 80E1BC19423; Tue, 24 Feb 2026 08:20:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771921225; bh=iQjPg2LXKrMXc3WCOF+ndy+MkCA4NlMl9SonN6terl0=; h=From:Subject:Date:To:Cc:Reply-To:From; b=K579pUTO4w95yrmEg1Y/mCmdrwgdRzLg0Z5FeR+eRydrHGmR7AjnFQ2J0z6ya5xjg nPQmWwiSafwQ9mdntWPpxy+9QG6iHTZGr6aWi+myYYWx3iLEIOrm8OP+3bvecd4d7+ Yn4zYcPMlzuioIbsoUsyT36qr/rkJqcJL86vrKgpVXNEQP0RI4k4tTJzmpNNYxH1uU 7S8dPNd948Snq5szoyrmnC/kPxgG/2OGN7PAIh9FPSBiGf9UE13YV958PGQWst9emk 1Klcs0gABDPLR22znBKy7vBF1MTJ1QrAl700JsifUfVuQ06UcKzIIk0U1SxHOzzjKj sSRoT//051Nkw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F5FDEFB801; Tue, 24 Feb 2026 08:20:25 +0000 (UTC) From: Simon Baatz via B4 Relay Subject: [PATCH net v2 0/2] tcp: re-enable acceptance of FIN packets when RWIN is 0 Date: Tue, 24 Feb 2026 09:20:11 +0100 Message-Id: <20260224-fix_zero_wnd_fin-v2-0-a16677ea7cea@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/2WNyw6CMBBFf4XM2pp2AI2u/A9DCLRTmERa0hJ8k P67DXHn8r7O3SBSYIpwLTYItHJk77LAQwF67NxAgk3WgBJPElEJy6/2Q8G3T2day04Y1XdKaVP 28gx5NgfKnR15B0cLNNkcOS4+vPebVe3Rj4j/xFUJKWpbybK61GhLfRumjh9H7SdoUkpfUlVIX rUAAAA= X-Change-ID: 20260221-fix_zero_wnd_fin-d1ba11cd3b07 To: Eric Dumazet , Neal Cardwell , Kuniyuki Iwashima , "David S. Miller" , David Ahern , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Simon Baatz X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1771921224; l=983; i=gmbnomis@gmail.com; s=20260220; h=from:subject:message-id; bh=iQjPg2LXKrMXc3WCOF+ndy+MkCA4NlMl9SonN6terl0=; b=d2tKmYZIkxzmfzTEaX20IA/Rl77jjUafMxejHMQM6gR1Cu7IFRtm4uyA+V5hpawd/43oiOUzg ZpYRClF6pTqC/734SUwhOJg+HzaIhMepKGrD+7M4LKP5ypxCmFY/ctB X-Developer-Key: i=gmbnomis@gmail.com; a=ed25519; pk=T/JIz/6F5bf1uQJr69lmyi7czVG+F9TVZ/8x5z9Wtqw= X-Endpoint-Received: by B4 Relay for gmbnomis@gmail.com/20260220 with auth_id=641 X-Original-From: Simon Baatz Reply-To: gmbnomis@gmail.com Hi, this series restores the ability to accept in‑sequence FIN packets even when the advertised receive window is zero, and adds a packetdrill test to guard the behavior. Signed-off-by: Simon Baatz --- Changes in v2: - Move the FIN handling out of the default execution path as suggested by Eric Dumazet - Link to v1: https://lore.kernel.org/r/20260222-fix_zero_wnd_fin-v1-0-5f4034952f3c@gmail.com --- Simon Baatz (2): tcp: re-enable acceptance of FIN packets when RWIN is 0 selftests/net: packetdrill: Verify acceptance of FIN packets when RWIN is 0 net/ipv4/tcp_input.c | 18 +++++++++++---- .../net/packetdrill/tcp_rcv_zero_wnd_fin.pkt | 27 ++++++++++++++++++++++ 2 files changed, 41 insertions(+), 4 deletions(-) --- base-commit: d4f687fbbce45b5e88438e89b5e26c0c15847992 change-id: 20260221-fix_zero_wnd_fin-d1ba11cd3b07 Best regards, -- Simon Baatz