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=-5.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 223EEC2D0E2 for ; Tue, 22 Sep 2020 11:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0E0823600 for ; Tue, 22 Sep 2020 11:28:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="WdLE/hJ4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726487AbgIVL2R (ORCPT ); Tue, 22 Sep 2020 07:28:17 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:25447 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726454AbgIVL2R (ORCPT ); Tue, 22 Sep 2020 07:28:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600774095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ELNDqsHaEnnMd6daVabrNKHCgeitBykR38gWb5vAGas=; b=WdLE/hJ4DLnLKWP1Ct3uFjzz6RZQOtLBxRxbcpFLNwEyfpF4xgXEIS5yK/wEFMGE2kKoIR PLnhiCeOUaG3Z8+uFyx+INI9/cE73v8//ateiJow2iJbJH5MmF+6qH2CYSOJdFGV/x4+EP tbuW2WOFDmPqPA7sSwpr/Amc8f2wjGM= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-355-4JoOhFNhOkWoazqX8OkJFQ-1; Tue, 22 Sep 2020 07:28:13 -0400 X-MC-Unique: 4JoOhFNhOkWoazqX8OkJFQ-1 Received: by mail-wr1-f70.google.com with SMTP id g6so7296283wrv.3 for ; Tue, 22 Sep 2020 04:28:13 -0700 (PDT) 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:in-reply-to:references:date :message-id:mime-version; bh=ELNDqsHaEnnMd6daVabrNKHCgeitBykR38gWb5vAGas=; b=eE9DVmx5Aj22dngB941dlelhsNBz2KZJZ98bnDLnprw+Qc0p3lWREd6+2DvlzDcplC dLzYF+tqDja6Jzmo2cEUYLJrH0wnVjB6dg7dXFoGYSJdkcx9AHBETQeA0Q30muyIWCY7 DjjLE4Xei1eyFOcek7PXeIOZ2RQfp+iwYCIRsXfOfvH1mefPRy/fqj0VqU6XnCBLrJU2 qH0WUeTH6duwEoxIFQyzXQGr5pEBbzBZlySK9XUER+85CaxKwPI58UHM5QJrmjs6Cr9I uAanSYmsWrA+CFavSmSihOcHr/zsCwioOYB8sFCg4CWxGgGa4SXvbCHldfh4De7T0SgN 9q/Q== X-Gm-Message-State: AOAM530sULHBAwzuAwbZS353MRyWmaGYsXQP9muua/gZ58wiEbnBMgUx 3jge+uG3Wuu8DXqrJ6B5c9lNNbnr3C6cGPoV2CZVUFp6yixbW0lJ5npTlQVc7ZFDHTvTer7AoNJ JHolsa9QLHZwGHEbg2pypuyc= X-Received: by 2002:adf:cd0e:: with SMTP id w14mr5298610wrm.0.1600774092796; Tue, 22 Sep 2020 04:28:12 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwaXwVoJY21MDdCz8358Tz9d/3e5nKGaFD05r2abHrPj7beTjxaXhEEtaB5F8I+Q4B+WurQuw== X-Received: by 2002:adf:cd0e:: with SMTP id w14mr5298601wrm.0.1600774092656; Tue, 22 Sep 2020 04:28:12 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id i6sm28764599wra.1.2020.09.22.04.28.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Sep 2020 04:28:12 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id A8C17183A99; Tue, 22 Sep 2020 13:28:11 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Topi Wala , xdp-newbies@vger.kernel.org Subject: Re: NDv6 and xdp-filter In-Reply-To: References: X-Clacks-Overhead: GNU Terry Pratchett Date: Tue, 22 Sep 2020 13:28:11 +0200 Message-ID: <874knqoxtg.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: xdp-newbies@vger.kernel.org Topi Wala writes: > Hi, > > I've installed an xdp-filter (dny_all) on my tap interface (and am > only letting through L2 packets that match my src/dst mac), and it > still lets through NDv6 traffic. Do L2 multicast packets not get > "received" by the xdp filter? Running tcpdump inside Qemu linux > connected to this tap interface shows me NDv6 multicast packets from > the ToR switch. All packets should be received by the XDP program; but only in the ingress direction. So what do mean "running tcpdump inside the qemu instance"? That sounds like you're talking about packets going *out* of the TAP interface from the host PoV? XDP won't see those (you'll have to run the program on the physical interface). -Toke