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 219A4C54E4B for ; Sat, 9 May 2020 21:31:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F1B522083B for ; Sat, 9 May 2020 21:31:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rWXeKbbA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728073AbgEIVba (ORCPT ); Sat, 9 May 2020 17:31:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726472AbgEIVb3 (ORCPT ); Sat, 9 May 2020 17:31:29 -0400 Received: from mail-il1-x143.google.com (mail-il1-x143.google.com [IPv6:2607:f8b0:4864:20::143]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75CC3C05BD09 for ; Sat, 9 May 2020 14:31:29 -0700 (PDT) Received: by mail-il1-x143.google.com with SMTP id b18so4846901ilf.2 for ; Sat, 09 May 2020 14:31:29 -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=hJ7z4VAJSx+xm7FsCX5ABKX2tbQO8xkYPxQslY9d7K0=; b=rWXeKbbANOWUUwP7lpX8Cf9DypzTSTus6AtVqPLXV/44YtFHj5dLS43e4UxvJdWVry gwleo1nb3nWjzEjj9K3w/eKzcAiNBlaqAtRX9yIXuOtxAocr3na/utdf6mExMDCvNdmM d7DK+79H5yESiqkR8KA/BALWvVCPgho//KlswpCxh08D/Ll90Ka/PzACPfpx5feJsrSd UcQjfBzYV7mYxN4rxPdH+WfIs6U3L+3kpZijJdaBG/vRoRMSmJTfk6pVz2PxTo1h4XsN zDMohhkIQ5vFvqUk19hlU1mgcfk4ntA++fv6c/7twKf647EPBqgO/iMVtIRgWNXSTMtj XqWQ== 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=hJ7z4VAJSx+xm7FsCX5ABKX2tbQO8xkYPxQslY9d7K0=; b=cxpYKA/di7SWEosGKw8EyqGk9EXEGvnWX8Pnn8YxSlkv6lQJ3Q94A9WCTu2QX52EAe FO3rTl2x+O9PVDtTlq9gY7coELGGp1OVYSHQnDK0y/BslpcmINA7YESNoQpGbHe176Yw DANMP7om1s/qkq68+ovovx5bE/Mu5Sr12bLjLcUx6tiKrhFusI92NyenA8Icd2AAYmTQ Ak3hfStYn6JXk9ANjnLbqL1Hy6AMVR04Yy4QrPCSQAZ56mi8vrsxfYqOYf+56WdJTsg1 1oXnprg7V1Q6ppF4TKE/vgMZc1L7gjfRS08a6sL5wHHykm7jIjjTIEQsF1bre30f6cD2 8zww== X-Gm-Message-State: AGi0PuY5IuTOCw8mRHsZKcMKxuc7hbQC1MCVXfxw0fJ6PGzWxWyfkytG fDifzRV6c+HIzfAJDuXpaddhe2Ty6QogpWKS2vIVFQ== X-Google-Smtp-Source: APiQypKcAQjRZAeKQxjwrnh8OcxFNef9L1axiqwOy9aJfYL/oi19NkpaLm+EZzvOr9D2wLBWlSM9GkX0opkLZaeBXcE= X-Received: by 2002:a05:6e02:544:: with SMTP id i4mr9590534ils.145.1589059888556; Sat, 09 May 2020 14:31:28 -0700 (PDT) MIME-Version: 1.0 References: <20200509211744.8363-1-jengelh@inai.de> In-Reply-To: From: =?UTF-8?Q?Maciej_=C5=BBenczykowski?= Date: Sat, 9 May 2020 14:31:16 -0700 Message-ID: Subject: Re: [PATCH] doc: document danger of applying REJECT to INVALID CTs To: Jan Engelhardt Cc: Pablo Neira Ayuso , Florian Westphal , Linux NetDev , Netfilter Development Mailing List Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Also maybe the example should be: instead of just: -A INPUT ... -j REJECT do: -A INPUT ... -m conntrack --ctstate INVALID -j DROP -A INPUT ... -j REJECT