From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qt1-f202.google.com (mail-qt1-f202.google.com [209.85.160.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 93A371A9F87 for ; Wed, 29 Apr 2026 08:00:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777449640; cv=none; b=e2G8g6ps7xLuh6Xfai8JTb6ws05HsRsVR5p05CgzcjPukkwXO1HRuSJWU97yFixh7ZliqC9SfYSFuDAwq7PLu+kcrDSQrKpkTezFd27uI1y3Pox7pN6vykJEQ23eZrn1kVfieMDkJbIlzebk0Gno3i80yF6SuvC6wOWj+Btjrj4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777449640; c=relaxed/simple; bh=1XA04OMasEvcQGTaU7JzGlnfaWDhh0n2i98axrtVDrA=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=Ae7qDhMLOFYKcPk81jgSJPTiJ/Nl/LsC0d3wTvGeUrwVR/rZaNvbP8ZazT/xqAFBxgeR6ww7C+YdcaTwpe2O0jMlfSOwFf/xsP2Hok/guhu2beBRtifY/YwBbHMO8gG+mO2AuuIGJA2fzdocP2RpZQMSd7obs3JontnZJFXwRa8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=mpyvHnTz; arc=none smtp.client-ip=209.85.160.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="mpyvHnTz" Received: by mail-qt1-f202.google.com with SMTP id d75a77b69052e-50fba8d8c40so11673281cf.3 for ; Wed, 29 Apr 2026 01:00:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777449638; x=1778054438; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=wC8AYkUXPDgGEFvJ2Vifue2AUVg0Os0iG7aeN5r8bwc=; b=mpyvHnTzLM2ECphc5yuHcuEVgS5kozOX/eQgoZLvWasirQaVyTC//F4x1x0FaW8IJN 1eQmZDFBZj1OJ5mdtZj+TVEvCfbt0MUh8/I+KKtiM33Rd0QzIuaSR5fk7HLF37/EmvZV o5poAuB3ynbMqx0Rr0uzr2YoB5ygXHBsHPl5UO6SlrbZGi0hId2XBFgRx+jI2goo3m7k iiTQq7ZbSWvJqV79JaYb17MS2MYHoqc978TOBOyrQ4NakNZiMJnmx8Ksa5jtY+XO0XAC mh9Vl4PY1+QiFCgUcGm+0Fu3qR3BaQy7DAqv/JtXIZSoQLk8DEVoWWPG1Z31O/7ez55M bf+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777449638; x=1778054438; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wC8AYkUXPDgGEFvJ2Vifue2AUVg0Os0iG7aeN5r8bwc=; b=rSA07bTARQvdaHRAkLwqiBz5ew7gYdV7VFBf+yCnY/h6FxU98ZWAV9DPqKaA5PKbtL DfiRGTmuhpzEhKkCfXM2HT8j7YXir533eIC+q+qCGhrGcIAclnSo94lQzIl2fAIXvMzY vs0P1Q38YCfS7XvrUYe/0DOrEGI7SSB5jL/2cXFoOhY/b5+/twrnVS9mzx55XGHqmm1H FCKdmdPW+XKFT68PiXSBpJt9GFGqYH8PD7Wm98Ea5VmolCdpQMRCNgQAJdoqNzwsy2hK ZdhykdCvjUObM5H18dtE9WaQ+9NkLISR7pmgag+MbQuyljDssGSH7K3IQpZi1lbAawGZ ZwQA== X-Forwarded-Encrypted: i=1; AFNElJ/jYKio6FO0yoqvtoOUD6usQ6sSwECO1uSxz/igx8K2bof1Up3dodeKvlwXDDB2AyruNahKD9M=@vger.kernel.org X-Gm-Message-State: AOJu0YzEIJQ6Yw6Nz4eaIfebnJN9Ui0sDvqYB/ieOv5gAALnmgsXrYlY QYZL9/GUDCBkldmciX6dIOILXmS+CPmpgok2sjge3gy8WK8dpQBtls47mFjYVpMhZI3qGTGbefZ uardalAeqcuhLyA== X-Received: from qtuu7-n2.prod.google.com ([2002:a05:622a:aa47:20b0:50e:5a17:f022]) (user=edumazet job=prod-delivery.src-stubby-dispatcher) by 2002:a05:622a:1355:b0:50d:9204:4652 with SMTP id d75a77b69052e-5100e1d0764mr94771131cf.41.1777449638251; Wed, 29 Apr 2026 01:00:38 -0700 (PDT) Date: Wed, 29 Apr 2026 08:00:36 +0000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260429080036.1528533-1-edumazet@google.com> Subject: [PATCH net-next] selftests/net: packetdrill: add tcp_syncookies_ip6_9k From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Neal Cardwell , Kuniyuki Iwashima , netdev@vger.kernel.org, eric.dumazet@gmail.com, Eric Dumazet Content-Type: text/plain; charset="UTF-8" This test checks syncookie mode is able to reconstruct some client options when TCP TS are used: - wscale option. - sackOK. - MSS (in a limited way). - ECN (not tested, because of limited value). Signed-off-by: Eric Dumazet --- .../net/packetdrill/tcp_syncookies_ip6_9k.pkt | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 tools/testing/selftests/net/packetdrill/tcp_syncookies_ip6_9k.pkt diff --git a/tools/testing/selftests/net/packetdrill/tcp_syncookies_ip6_9k.pkt b/tools/testing/selftests/net/packetdrill/tcp_syncookies_ip6_9k.pkt new file mode 100644 index 0000000000000000000000000000000000000000..15d03992a99140ecc4241edae58693dc5098fece --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_syncookies_ip6_9k.pkt @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Check syncookies. +// +// Check we are able to rebuild client sack, wscale and mss options. +// IPv6 msstab[4] = { 1280 - 60, 1480 - 60, 1500 - 60, 9000 - 60 } + +--ip_version=ipv6 + +`./defaults.sh +sysctl -q net.ipv4.tcp_syncookies=2 +ip link set dev tun0 mtu 9000 +` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +0 bind(3, ..., ...) = 0 + +0 listen(3, 10) = 0 + + +0 < S 0:0(0) win 32792 + +0 > S. 0:0(0) ack 1 + +.01 < . 1:1(0) ack 1 win 1024 + + +0 accept(3, ..., ...) = 4 + +// Check we properly infer from the final packet the other peer wanted 8940 mss, wscale 10 and sackOK + +0 %{ assert tcpi_snd_mss == 8928, tcpi_snd_mss }% + +0 %{ assert tcpi_snd_wscale = 10, tcpi_snd_wscale }% + +0 %{ assert (tcpi_options & TCPI_OPT_WSCALE) != 0, tcpi_options }% + -- 2.54.0.545.g6539524ca2-goog