From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E00BC28CBC for ; Sat, 9 May 2020 18:02:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 26655208CA for ; Sat, 9 May 2020 18:02:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rAMmZ2jV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727863AbgEISCh (ORCPT ); Sat, 9 May 2020 14:02:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726214AbgEISCg (ORCPT ); Sat, 9 May 2020 14:02:36 -0400 Received: from mail-io1-xd44.google.com (mail-io1-xd44.google.com [IPv6:2607:f8b0:4864:20::d44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BCC6C061A0C for ; Sat, 9 May 2020 11:02:36 -0700 (PDT) Received: by mail-io1-xd44.google.com with SMTP id d7so5159398ioq.5 for ; Sat, 09 May 2020 11:02:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Aqzi31B4lB7EoaZQ+FK0ZwwXEjmhbTHSk4NXHROzAKE=; b=rAMmZ2jVDzFafNNJaeH5i7FM2LLOBi5CfK8f1M+5DA/34UmGKnOgOjnnYlCFFFbjUU 3GboYI/aDhyYWk4pPwxJ52LFHaE2w4WfJqxl8V7/UUj3UbxbwLG6fFZRs/On9OfLdt3l vzWdbL99CGuPrY0cl9QF6MFmkV2UWeL5jsjzbb7DO2Fu/+xJQDmdNMLJGDDzaKY3bEHD iBGPIK4r4NMSUDD0YKVTlA/tKiHdwyovggKYtR7XMUCTcDzT/00lVckzTDovtsaI8FwP Jm3tj4hwCKTn70rMBTpfg9pEISAWu7Z+nwps5pw0eHOHhb89N0e0cpbjcELm29p71bBV OGnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Aqzi31B4lB7EoaZQ+FK0ZwwXEjmhbTHSk4NXHROzAKE=; b=aj04NvOvCJNrVYsjT1HFimGkBsIp5BOCJKRiTHSavXwQIw9zaOBG6unj/hwNlnrCAE 7OHbd76qRgqCN3BeIGaABSgjV1CsOCWfF9BMyuprMm8vQ8haJt7nn/eFfVGLPoDsPoZt SFbhfHmg5bAPo20Y0tlkB7aZxzqnRrZczMINlrGMDsr8z3frvA8X0Yn/YOAEBhIVx4KL JCBfSGm9PlkDiKOscRqldtTOxSDB7cSwzyAeXOBzk4cGZCWHM2/WWVkbdvaKvqK3wO9m XzzRqo+gGepPJUbGMNXDswqkqQmOF97lJCHLGPuKGbw6rIzmFP2PjEAdfjLkB3gMZ2rx 6O3g== X-Gm-Message-State: AGi0PuZzE5+0H5HDpfE8kFOZZYHqMYiJgkQPrR6FpUQ+c/rdw8Vb96ro b1Y7utrItS4YGRGAja8BgIHrsOdUj77QBF0tBm7DFA== X-Google-Smtp-Source: APiQypLSzXmQo2+CQ+YJm3gNvF6RrvZk/X6nVlc4jzEZN94Y7nyOEvJ5sCwPYx3oMkZPxHQDM49bP81GXtOO/607TuA= X-Received: by 2002:a6b:bc85:: with SMTP id m127mr7945271iof.89.1589047355256; Sat, 09 May 2020 11:02:35 -0700 (PDT) MIME-Version: 1.0 References: <20200509052235.150348-1-zenczykowski@gmail.com> In-Reply-To: From: =?UTF-8?Q?Maciej_=C5=BBenczykowski?= Date: Sat, 9 May 2020 11:02:23 -0700 Message-ID: Subject: Re: [PATCH] document danger of '-j REJECT'ing of '-m state INVALID' packets To: Jan Engelhardt Cc: Pablo Neira Ayuso , Florian Westphal , Linux Network Development Mailing List , Netfilter Development Mailing List Content-Type: text/plain; charset="UTF-8" Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Side note, it doesn't have to be nearly as aggressive as the above. With just: tc qdisc replace dev ifb0 root netem reorder 99.9% 0% delay 1s I still see 169.58M @ 7.02MB/s in 26s: [24263:180667450] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT [27:174654] -A INPUT -m state --state INVALID -j DROP [0:0] -A INPUT -p tcp -j REJECT --reject-with tcp-reset And the connection still freezes without the INVALID/DROP rule (after 43MiB this time)