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 DB4D638F9C; Sun, 22 Feb 2026 12:35:19 +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=1771763719; cv=none; b=lMStdfN8YDztbWWXeCW3DHzmZwpEAGgxjmc7LvKfEQL8NejPE7CHhphKS8IqQDWSYjJrqa8wD5t0Y2N9ERnS1KAndr26zNh7ix2DW7ZkFxQgjb1uJ23nds7v3jqxGnC1N8Rm6pUqEspYJpLsoZKvrp62pT2kv5TvAxBzfrQUmrA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771763719; c=relaxed/simple; bh=Ad3HcaJiaO0xhdi6BjPXye6filJoTMtnWzaj36dECf4=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=VhltvCbFDcYVCLs2K/NFKt1ue7KKibWnyJE4FWQ0GxcmLSFb4DJQzDuUmjnYqBLer58W+6StEwrPMVFz/nWy9bDCMadubqXJQ3LL+8wXEoZn5LV+Qz/UEhPkoybJCJKzmbNFjyrPWonggvE6CFWqlhAzyMMVIZi2tu4+9PX0+Z8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BGNiuGST; 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="BGNiuGST" Received: by smtp.kernel.org (Postfix) with ESMTPS id 7643BC116D0; Sun, 22 Feb 2026 12:35:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771763719; bh=Ad3HcaJiaO0xhdi6BjPXye6filJoTMtnWzaj36dECf4=; h=From:Subject:Date:To:Cc:Reply-To:From; b=BGNiuGSTA1hfBqXw+BWSDd0nb5DvJwtyfISIm3AUT82mH/d27ffZwADfWg4GWzAih vK3D9+WVyBuwf2rf0YuzrS36E5HRXboO5/is+qFZXTeZCxvqHzc103TELM7+m7txKD Icg9ZwgfVUaU2noVu5z4t+5PtKchYW/2J2nR4i2SepxliyBCGNbpme0VfsZn/gtKs0 7ueYwJfWQjX9XVsiiREpNM84eE2F9wrhppTdEdVrbsm4h6vPG5iCQl1ZrlMMZrAkzL KcKhHmtQ7/P49R0qiIiF1MeGsyP5BsZi+/qUTBoV1CeMDyk7yVM5piyr8RCsIragro QXwghH6xtlhsg== 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 6C83AC61DFD; Sun, 22 Feb 2026 12:35:19 +0000 (UTC) From: Simon Baatz via B4 Relay Subject: [PATCH net 0/2] tcp: re-enable acceptance of FIN packets when RWIN is 0 Date: Sun, 22 Feb 2026 13:35:07 +0100 Message-Id: <20260222-fix_zero_wnd_fin-v1-0-5f4034952f3c@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@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/x2MQQqAIBAAvxJ7TnANCvpKhJRutZctNCoS/550H JiZBJECU4S+ShDo4si7FMC6ArdNspJiXxiMNq02BtXCj30p7PYWbxcW5XGeEJ1vZt1ByY5Axfm XAwidMOb8AWG+m55nAAAA 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=1771763718; l=767; i=gmbnomis@gmail.com; s=20260220; h=from:subject:message-id; bh=Ad3HcaJiaO0xhdi6BjPXye6filJoTMtnWzaj36dECf4=; b=a4wxL2o8dJnNrLbg12N86bR+YJDyDe+zCosqzLSxm28QtxkJzW+Bo1FrcyO6/PiwAXsHp0+OL 6gYnbe9lCz7C8nbCQSPVf/kBkJ3JZtcsvrGfYFyj1xdBx4zcmeekK1T 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 --- 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 | 7 +++++- .../net/packetdrill/tcp_rcv_zero_wnd_fin.pkt | 27 ++++++++++++++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) --- base-commit: d4f687fbbce45b5e88438e89b5e26c0c15847992 change-id: 20260221-fix_zero_wnd_fin-d1ba11cd3b07 Best regards, -- Simon Baatz