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=-2.0 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 E529EC433B4 for ; Fri, 23 Apr 2021 06:46:19 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8792661409 for ; Fri, 23 Apr 2021 06:46:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8792661409 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1lZpZj-0003Rb-6D; Fri, 23 Apr 2021 02:46:03 -0400 Received: from mail-pl1-x62e.google.com ([2607:f8b0:4864:20::62e]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1lZpZh-0003Qx-Dp for kernelnewbies@kernelnewbies.org; Fri, 23 Apr 2021 02:46:01 -0400 Received: by mail-pl1-x62e.google.com with SMTP id 20so20808095pll.7 for ; Thu, 22 Apr 2021 23:46:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:message-id:date:user-agent:mime-version :content-transfer-encoding:content-language; bh=rNUJi0mB8RacgxXPIaKO5qLWaSe9qz8dUkXkgsSU8f0=; b=nV1uma6PSnCoYxMm5RcDs+BJ+xphH0UPev0/RmS5tWML9HZdoC9EEvBqpYLzAUCVVH mFsorwV6CbUMI0aJK4bsudEMJieRrejccAyM/ff8/1zqZMIhuowOC71wIzFbB6Za2S6Q +55rcrUb9w4GPp5kOa8QoLQRP3Tk4qFTmDCx5XbI1MFkboPrMYRn5yTC5C2X+Tp08yjn dSxsXd8hnPmA6shYBC9YxuXCe9Pwx7fbfEGbdUAv8tjoV1vLNr+W2Vn9SrHp22SdCQPY l6aU5qmahQXKAAmm8A3ZxgVA8IQN5fLCXFzEK5F+oP7dJ+Rgk/Ue0Dv4H6BHs4iQeZha ydGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:message-id:date:user-agent :mime-version:content-transfer-encoding:content-language; bh=rNUJi0mB8RacgxXPIaKO5qLWaSe9qz8dUkXkgsSU8f0=; b=KIVrSRdGi5e2w2yez5gy4mJ8QC/uWYnnMIJPPrITCCWQLiU06KXhffD+cUxJeXcie9 DjnuW9ib2phDYx+E/jbyMPvxCbhmszlKNreekJ9lBZ5YwM02omZjv7y5aAn4ZjurqJUP qEb5+RdLEPF7ayHcLZbLkNwES2Bl3ci3oQ/CtNz1c1tcnkTCzdrmGGLqMNg3f/GVOg8t zkrxHY72LTlNY3K+wLRA25jxNXtAp3zipHu9stdTj3MELGpxntGBiRKapi5tVFfORHvp 61O5B7BS2lejIQK0KVn7w/2VG73WddAVNF4rFDkw5jcJo73bciyU9hH/E3NqpSuI3Ov7 ZTFA== X-Gm-Message-State: AOAM530OlFsLGZMP1JdfHYz5x43KDtZYLX4yV3Wl0xnSWhyM7UdDkYwM 8VVZi5HWX8Y7IA58WK1Jya5Bcc7JOWQ= X-Google-Smtp-Source: ABdhPJwSSxQiyy1kuLpElM+6ZJeSFBKQWMHUMAOKpnsLwappgNf4+RmMB1jEtjlLX0I6MR6O/bj3yA== X-Received: by 2002:a17:902:c392:b029:ec:b679:bfea with SMTP id g18-20020a170902c392b02900ecb679bfeamr2281955plg.59.1619160359235; Thu, 22 Apr 2021 23:45:59 -0700 (PDT) Received: from [192.168.34.21] ([220.94.242.226]) by smtp.gmail.com with ESMTPSA id s21sm6486284pjr.52.2021.04.22.23.45.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Apr 2021 23:45:58 -0700 (PDT) From: JeongHwan Kim To: kernelnewbies@kernelnewbies.org Subject: TCP syn flooding protection Message-ID: <0485e030-c915-14fa-5bff-c0a0895c295b@gmail.com> Date: Fri, 23 Apr 2021 15:45:54 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 Content-Language: en-US X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: kernelnewbies-bounces@kernelnewbies.org Hi, everyone I'm testing packet flooding test with old kernel version 2.6.30. My board experienced process starvation when injecting ICMP flood with hping3 tool. I modified softirq invocation routine to launch ksoftirqd instead of executing do_softirq and I limitted the speed of ethernet phy to accept below 10Mbps. It seems that the board can process flooding ICMP packets of 10Mbps, but the board cannot process against TCP/UDP packet flooding, the speed of processes become slow down. IPtabls of which rule is dropping all TCP/UDP packet does not improve the situation. How can I protect the TCP/UDP flooding in my environment. Thanks in advance. Kim _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies