From nobody Sun Nov 1 10:09:47 2020 Return-Path: X-Original-To: int-dir@ietfa.amsl.com Delivered-To: int-dir@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D7C6A3A0CB3; Sun, 1 Nov 2020 10:09:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W-1YhJcOStnw; Sun, 1 Nov 2020 10:09:35 -0800 (PST) Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 407273A0CB2; Sun, 1 Nov 2020 10:09:34 -0800 (PST) Received: from kduck.mit.edu ([24.16.140.251]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 0A1I9PNH025881 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 1 Nov 2020 13:09:31 -0500 Date: Sun, 1 Nov 2020 10:09:25 -0800 From: Benjamin Kaduk To: Ted Lemon Cc: int-dir@ietf.org, last-call@ietf.org, draft-ietf-tls-md5-sha1-deprecate.all@ietf.org, tls@ietf.org Message-ID: <20201101180925.GR39170@kduck.mit.edu> References: <160390057302.19892.7954643072007013939@ietfa.amsl.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <160390057302.19892.7954643072007013939@ietfa.amsl.com> Archived-At: Subject: Re: [Int-dir] Intdir last call review of draft-ietf-tls-md5-sha1-deprecate-04 X-BeenThere: int-dir@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "This list is for discussion between the members of the Internet Area directorate." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Nov 2020 18:09:37 -0000 Hi Ted, Thanks for the review, especially for thinking about the point that Éric requested. I don't really agree with your nit, though, as there have been improved crypanalysis and correspondingly improved cryptographic attacks on both algorithms over time (SHA1 more recently than MD5). Increased computational power to take advantage of those cryptographic weaknesses is certainly a factor in moving to deprecate the vulnerable algorithms, but it is not the only factor. -Ben On Wed, Oct 28, 2020 at 08:56:13AM -0700, Ted Lemon via Datatracker wrote: > Reviewer: Ted Lemon > Review result: Ready with Nits > > This document is ready for publication, with one minor nit, which is included > at the end. > > Éric additionally made the following request: > As those hash algorithms were 'cheap' for TLS, I would appreciate a review of > the impact if those algorithms are deprecated in TLS 1.2. > > I am not in a position to do any practical tests, but I will point out several > things. First, deprecating MD5 is not going to cause a performance problem > because it's slower than SHA1, so we really only need to worry about whether > deprecating SHA1 will cause a problem. This document only deprecates SHA1 for > use in digital signatures. It "does not deprecate SHA-1 in HMAC for record > protection." Given the way TLS uses digital signatures, this should not be a > serious concern. At worst case, SHA256 is about 24% slower than SHA1. Best case > (shorter text) it is less than 16% slower. It's reasonable to expect that in > common use in TLS, the texts being digested will be shorter, not longer. > Further, the bulk of the computational burden of TLS is not in the generation > of digests for digital signatures. Therefore it seems reasonable to expect that > the performance impact of this change is vastly overshadowed by one of the very > factors that motivates it: the increased speed of hash computation over time. > Even assuming constant speed legacy hardware, the performance impact is not > sufficient to cause concern when considering it as part of the total system > that would be using TLS 1.2. > > Nit: > > In the abstract: > The MD5 and SHA-1 hashing algorithms are steadily weakening in > strength and their deprecation process should begin for their use in > TLS 1.2 digital signatures. > > Technically, the strength of these algorithms hasn't changed. What's changed is > that their strength is no longer sufficient to prevent realistic attacks. So it > might be better to say something like "The vulnerability of MD5 and SHA-1 > algorithms to practical attacks is steadly increasing and ..." > > > From nobody Sun Nov 1 13:53:49 2020 Return-Path: X-Original-To: int-dir@ietfa.amsl.com Delivered-To: int-dir@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 800783A098D for ; Sun, 1 Nov 2020 13:53:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, NO_DNS_FOR_FROM=0.001, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=0.01] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=fugue-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kwaOJ80X35E8 for ; Sun, 1 Nov 2020 13:53:45 -0800 (PST) Received: from mail-qk1-x730.google.com (mail-qk1-x730.google.com [IPv6:2607:f8b0:4864:20::730]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C23053A0985 for ; Sun, 1 Nov 2020 13:53:45 -0800 (PST) Received: by mail-qk1-x730.google.com with SMTP id p3so9981929qkk.7 for ; Sun, 01 Nov 2020 13:53:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=ISk9KTcm6/gengRlF1KwFyjVyAi6oUB6TGo9fa5AfUM=; b=gXM9dlZ5tAP1WmRQy4j6P8G4hKKdNKXdq5ckIe5hrBtq4OK/r/dZI5VobqavOlBnbG 1OEkiduxY8v3t2wNmo9PH5I046fujWoZqKlhI9lmqDxCDwesJd0SpR1vI+KBzkk4LiOC 6zrpkKQV9wa9TDAnKdQEsK9wdz+cJS7ZLqmyD5sIbcOqucQz46VCRXbozFdf411KaPgv CeB6cFOO8IeGs1JkofIF7JJAxKE8ENTC43s+8AKQJQ4CGhDx3MdUlUyJajsEQxqdMy4e uDRoPQ/EARKOMw+OYIsAA92KqiQodSO0sCqFVAAwQ2p1U/e3G2oSdHfJCak+ADd5Jg2U FzNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=ISk9KTcm6/gengRlF1KwFyjVyAi6oUB6TGo9fa5AfUM=; b=EWeM+WamOmTz/FqqZm8iV2So9QrSApYJDuK+R2+kDsS1+D+5B5XrfY+fiWYO/XgLGy HFki1/v0+HoJpWLQ28XPUw+kF/0cHkeh9w2wgAF/L+OKUTiioQ/q/C06+6OsW4D38flw yB0lPok6iJLWGlkUOCoUAm+pobcIWqxv/seliH00d1ok2I7NnNv9mqCto/OoSNyaF7yX JAGpJdCpcE92CFW+675ZgGTwzf4ztmfN5zZ4Zhqnt2hh4U2oV81LTAyMBewzCKfCUr/R AGlcI7kt284hadaLVqoFZaya3EStUuSIg2qgl4/q3qVtMSOaXct2RAGeKI6vJoRVY22D Fqjw== X-Gm-Message-State: AOAM530VnsK6Iiw+YOxJ2R+iWTAZNVX4VNJt2ol3OsilAiZsq/W9wNds crWPV5hhtmqrOR0yY85nSj3NNg== X-Google-Smtp-Source: ABdhPJz0SZ9co57cb2Vvg2oVdcBJCLNrdR8H00bVzdsn/iLaF7ukFHwl6a6NheMdoyQ+spVkuWrr7g== X-Received: by 2002:a37:6fc5:: with SMTP id k188mr12412992qkc.317.1604267624169; Sun, 01 Nov 2020 13:53:44 -0800 (PST) Received: from [192.168.4.114] (c-24-91-177-160.hsd1.ma.comcast.net. [24.91.177.160]) by smtp.gmail.com with ESMTPSA id o187sm6646293qkb.120.2020.11.01.13.53.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 01 Nov 2020 13:53:43 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Ted Lemon Mime-Version: 1.0 (1.0) Date: Sun, 1 Nov 2020 16:53:41 -0500 Message-Id: <558A253B-FB53-4B00-9C67-9DF7AA37C952@fugue.com> References: <20201101180925.GR39170@kduck.mit.edu> Cc: int-dir@ietf.org, last-call@ietf.org, draft-ietf-tls-md5-sha1-deprecate.all@ietf.org, tls@ietf.org In-Reply-To: <20201101180925.GR39170@kduck.mit.edu> To: Benjamin Kaduk X-Mailer: iPhone Mail (18B84) Archived-At: Subject: Re: [Int-dir] Intdir last call review of draft-ietf-tls-md5-sha1-deprecate-04 X-BeenThere: int-dir@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "This list is for discussion between the members of the Internet Area directorate." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Nov 2020 21:53:48 -0000 FWIW my nit was simply that algorithms aren=E2=80=99t getting weaker: attack= s are getting stronger. Sorry if I worded the suggested text badly.=20 > On Nov 1, 2020, at 13:09, Benjamin Kaduk wrote: >=20 > =EF=BB=BFHi Ted, >=20 > Thanks for the review, especially for thinking about the point that =C3=89= ric > requested. >=20 > I don't really agree with your nit, though, as there have been improved > crypanalysis and correspondingly improved cryptographic attacks on both > algorithms over time (SHA1 more recently than MD5). Increased > computational power to take advantage of those cryptographic weaknesses is= > certainly a factor in moving to deprecate the vulnerable algorithms, but i= t > is not the only factor. >=20 > -Ben >=20 >> On Wed, Oct 28, 2020 at 08:56:13AM -0700, Ted Lemon via Datatracker wrote= : >> Reviewer: Ted Lemon >> Review result: Ready with Nits >>=20 >> This document is ready for publication, with one minor nit, which is incl= uded >> at the end. >>=20 >> =C3=89ric additionally made the following request: >> As those hash algorithms were 'cheap' for TLS, I would appreciate a revi= ew of >> the impact if those algorithms are deprecated in TLS 1.2. >>=20 >> I am not in a position to do any practical tests, but I will point out se= veral >> things. First, deprecating MD5 is not going to cause a performance proble= m >> because it's slower than SHA1, so we really only need to worry about whet= her >> deprecating SHA1 will cause a problem. This document only deprecates SHA1= for >> use in digital signatures. It "does not deprecate SHA-1 in HMAC for recor= d >> protection." Given the way TLS uses digital signatures, this should not b= e a >> serious concern. At worst case, SHA256 is about 24% slower than SHA1. Bes= t case >> (shorter text) it is less than 16% slower. It's reasonable to expect that= in >> common use in TLS, the texts being digested will be shorter, not longer. >> Further, the bulk of the computational burden of TLS is not in the genera= tion >> of digests for digital signatures. Therefore it seems reasonable to expec= t that >> the performance impact of this change is vastly overshadowed by one of th= e very >> factors that motivates it: the increased speed of hash computation over t= ime.=20 >> Even assuming constant speed legacy hardware, the performance impact is n= ot >> sufficient to cause concern when considering it as part of the total syst= em >> that would be using TLS 1.2. >>=20 >> Nit: >>=20 >> In the abstract: >> The MD5 and SHA-1 hashing algorithms are steadily weakening in >> strength and their deprecation process should begin for their use in >> TLS 1.2 digital signatures. >>=20 >> Technically, the strength of these algorithms hasn't changed. What's chan= ged is >> that their strength is no longer sufficient to prevent realistic attacks.= So it >> might be better to say something like "The vulnerability of MD5 and SHA-1= >> algorithms to practical attacks is steadly increasing and ..." >>=20 >>=20 >>=20 From nobody Sun Nov 1 19:22:39 2020 Return-Path: X-Original-To: int-dir@ietfa.amsl.com Delivered-To: int-dir@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5CC883A0CBA; Sun, 1 Nov 2020 19:22:34 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.847 X-Spam-Level: X-Spam-Status: No, score=-1.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CaYjPBBoAjE5; Sun, 1 Nov 2020 19:22:32 -0800 (PST) Received: from mail-io1-xd29.google.com (mail-io1-xd29.google.com [IPv6:2607:f8b0:4864:20::d29]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 90A793A0CB8; Sun, 1 Nov 2020 19:22:32 -0800 (PST) Received: by mail-io1-xd29.google.com with SMTP id s24so6722529ioj.13; Sun, 01 Nov 2020 19:22:32 -0800 (PST) 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=MGGjYmIoKYZgCoSYBJQbAydDOx2ScrxwEzWlRb6PNWY=; b=GJvd+D9LcrhHuxhs/m90Z1NEn/Vg7No+FwftQxof8i9M390Uihuqgwf+3LwdgOgPYT vTEnFShpqNzO1cV27WL9C2320ufzMMkinzzeoGv9mIv5oG5Z5C+/QCEziegNyEXH6+lW fONXHw5NjGs0eN9k/4KiGac4cXF1cAAUFLLVskN59mFwn9fvzDMPEZB4laMSTUyoqPjE NFHpAZd5j/06yxh+5Qh4PcZYe+EdhRmGLfHxocwf/Fmm6qYiqpSQI0Wyr7taCZENsRYi iv6FlZKl/ByLFNagfgVuakDZ28XTsIDFnvNPf2vO8hyDXXChyKtOAFPgdLR1clJLfiHQ XZDg== 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=MGGjYmIoKYZgCoSYBJQbAydDOx2ScrxwEzWlRb6PNWY=; b=AxrVg3VBfppfS6zyW7EA04uyXv2znk8nda9/s1Ku9YsOjZdWdB/KhOZLZwid6cXi5v AI6VfZymi3HZBAY7VFP/1gcZ0yqmFjOH3RN8iOBVN3uzBcQLtWPX8bjYhs/njH1RdEfa KIf8hYGDQXwJC/4YMLS5q+jgOSAbXosiNgn6vT0Iw/wVPr2fkB49TvUiIZHKc28bDAnn hRZkrHd/Lh4rdRwU3BhLQhsXR2DObyBk5q4rKzAjgxG5uN3uswmBFbDGb1alNhdWHd4X S7IIhfHG9DmvbKMHQhcXrs2+A0/+Fk1B5Alq4WCBB10z0DgCyTzOefmcd09zWxCkeXrE Zf/g== X-Gm-Message-State: AOAM5326D+itF73odukFiT0OqHgzTBh3oVgEEAYJNKJHAUftDf7lkMFY EUBJDx7XmYkNOp7K15gTD4/h/tprKs0aQimak3riYVUbz1E= X-Google-Smtp-Source: ABdhPJztPiY5N8LInwSIhj62kEg+jDkwAsdxCV26U6NBVkb3U+scFr6TognKhH0AlR16qXdMNm9tBCUHLUlVRHh+pEc= X-Received: by 2002:a05:6638:1651:: with SMTP id a17mr10287457jat.39.1604287350042; Sun, 01 Nov 2020 19:22:30 -0800 (PST) MIME-Version: 1.0 References: <160383583753.1693.10113897796672615402@ietfa.amsl.com> In-Reply-To: <160383583753.1693.10113897796672615402@ietfa.amsl.com> From: Donald Eastlake Date: Sun, 1 Nov 2020 22:22:18 -0500 Message-ID: To: int-dir@ietf.org, "Eric Vyncke (evyncke)" Cc: last-call@ietf.org, draft-ietf-idr-flow-spec-v6.all@ietf.org Content-Type: multipart/alternative; boundary="0000000000009df27905b3174152" Archived-At: Subject: [Int-dir] Intdir telechat review of draft-ietf-idr-flow-spec-v6 X-BeenThere: int-dir@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "This list is for discussion between the members of the Internet Area directorate." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Nov 2020 03:22:34 -0000 --0000000000009df27905b3174152 Content-Type: text/plain; charset="UTF-8" I am an assigned INT directorate reviewer for draft-ietf-idr-flow-spec-v6. These comments were written primarily for the benefit of the Internet Area Directors. Document editors and shepherd(s) should treat these comments just like they would treat comments from any other IETF contributors and resolve them along with any other Last Call comments that have been received. For more details on the INT Directorate, see https://datatracker.ietf.org/group/intdir/about/. Reviewer: Donald Eastlake, III Review Result: Ready with non-technical issues The draft looks good technically, but: Issues ----- Section 4: Does the IETF allow direct references into github in the main body of a standards track RFC? Looks like all the comparison code is in the Appendix. Can the github reference at least be moved to the Appendix? Section 11.2: As far as I know, there are only normative and informational references, not "URIs" references. Editorial --------- Section 1, 1st sentence: "to be also capable of supporting" -> "to also support" Section 1, 2nd sentence: OLD This document analyzes the differences of IPv6 [RFC8200] flows description from those of traditional IPv4 packets and propose a subset of new Border Gateway Protocol [RFC4271] encoding formats to enable Dissemination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis] for IPv6. NEW This document analyzes the differences between describing IPv6 [RFC8200] flows and those of traditional IPv4 packets. It specifies new Border Gateway Protocol [RFC4271] encoding formats to enable Dissemination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis] for IPv6. There are some other minor editorial things like plural/singular forms but I assume the RFC Editor will fix those. Thanks, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 2386 Panoramic Circle, Apopka, FL 32703 USA d3e3e3@gmail.com --0000000000009df27905b3174152 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I am an assigned INT directorate reviewer= for
draft-ietf-idr-flow-spec-v6. These comments were written primarily = for
the benefit of the Internet Area Directors. Document editors and
= shepherd(s) should treat these comments just like they would treat
comme= nts from any other IETF contributors and resolve them along with
any oth= er Last Call comments that have been received. For more details
on the I= NT Directorate, see
https://datatracker.ietf.org/group/intdir/about/.

Revie= wer: Donald Eastlake, III
Review Result: Ready with non-technical issues=

The draft looks good technically, but:=C2=A0
=
Issues
-----

Section 4: Does the IETF allow direct references= into github in the
main body of a standards track RFC? Looks like all t= he comparison code
is in the Appendix. Can the github reference at least= be moved to the
Appendix?

Section 11.2: As far as I know, there = are only normative and
informational references, not "URIs" re= ferences.

Editorial
---------

Section 1, 1st sentence: &qu= ot;to be also capable of supporting" -> "to
also support&qu= ot;

Section 1, 2nd sentence:
OLD
=C2=A0 =C2=A0This document an= alyzes the differences of IPv6 [RFC8200] flows
=C2=A0 =C2=A0description = from those of traditional IPv4 packets and propose a
=C2=A0 =C2=A0subset= of new Border Gateway Protocol [RFC4271] encoding formats to
=C2=A0 =C2= =A0enable Dissemination of Flow Specification Rules
=C2=A0 =C2=A0[I-D.ie= tf-idr-rfc5575bis] for IPv6.
NEW
=C2=A0 =C2=A0This document analyzes = the differences between describing IPv6
=C2=A0 =C2=A0[RFC8200] flows and= those of traditional IPv4 packets. It specifies
=C2=A0 =C2=A0new Border= Gateway Protocol [RFC4271] encoding formats to enable
=C2=A0 =C2=A0Diss= emination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis]
=C2=A0 = =C2=A0for IPv6.

There are some other minor editorial things like plu= ral/singular
forms but I assume the RFC Editor will fix those.

Thanks,
Donald
=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=C2= =A0Donald E. Eastlake 3rd =C2=A0 +1-508-333-2270 (cell)
=C2=A02386 Panor= amic Circle, Apopka, FL 32703 USA
=C2=A0d3e3e3@gmail.com
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d=tix.at; s=rev1; h=References:To:Cc:In-Reply-To:Date:Subject:Mime-Version:Content-Type :Message-Id:From:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=hge5G5zaeHydCB9MNUlpnrlJNVCPu/Ll9BRjaUurcKA=; b=AgA7KLtoucRJ1yPVTnsdvMN6gc 2oZLZrudyYfVBcDQOndDzR28wjasw8thtdUXFiUP8cLg0FLk7L8Nm4TAMmYvHlVDaFFVqhvvQa4my DNT/rwynD9a0A5WZz3yYjiJbOW+5N+Kv+hdZ/AvO5V8d0jAeGy5Yy7cVOSTAB0CYaKbrnwSQ7fXvF OeGoIO+GyCO5UxanTeU1uFifg84Q/IRzLWs7uHCNdez4D6gffl3kQ4P8+LfpyJ5PRDFoALUBab2rp DcEnfyY0aLfHXpFzeGsoTrl3ApXYvlNobqJJFHS3qoexuv6FdOsPs5ajy70YiWOaHGL1kOHO+T/9d l1nnE5uQ==; Received: from 80-110-113-91.cgn.dynamic.surfer.at ([80.110.113.91] helo=[192.168.64.148]) by mail.fbsd.host with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.3) (envelope-from ) id 1kaJqc-000EgI-Gu; Wed, 04 Nov 2020 15:33:16 +0100 From: Christoph Loibl Message-Id: <0B4B729D-C829-4C38-91AB-2A30557A0A6E@tix.at> Content-Type: multipart/mixed; boundary="Apple-Mail=_320F7652-BFA8-44F7-88FE-30AA5F60F338" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Wed, 4 Nov 2020 15:33:11 +0100 In-Reply-To: Cc: int-dir@ietf.org, "Eric Vyncke (evyncke)" , last-call@ietf.org, draft-ietf-idr-flow-spec-v6.all@ietf.org To: Donald Eastlake References: <160383583753.1693.10113897796672615402@ietfa.amsl.com> X-Mailer: Apple Mail (2.3608.120.23.2.4) X-Scanned-By: primary on mail.fbsd.host (78.142.178.22); Wed, 04 Nov 2020 15:33:14 +0100 Archived-At: Subject: Re: [Int-dir] [BULK] Intdir telechat review of draft-ietf-idr-flow-spec-v6 X-BeenThere: int-dir@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "This list is for discussion between the members of the Internet Area directorate." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Nov 2020 14:33:36 -0000 --Apple-Mail=_320F7652-BFA8-44F7-88FE-30AA5F60F338 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Donald, Thank you for your review and comments. See my comments inline. I also = attached a updated document that contains changes resulting from your = comments. Since the draft submission is closed now I will ask Alvaro to publish = the changed document today. Cheers Christoph > Section 4: Does the IETF allow direct references into github in the > main body of a standards track RFC? Looks like all the comparison code > is in the Appendix. Can the github reference at least be moved to the > Appendix? >=20 > Section 11.2: As far as I know, there are only normative and > informational references, not "URIs" references. This is exactly the same as in rfc5575bis which has been edited by = rfc-editors, I think we can leave this for rfc-editors. I see they = somehow removed this reference. >=20 > ## Editorial > Section 1, 1st sentence: "to be also capable of supporting" -> "to > also support" Edited as suggested. >=20 > Section 1, 2nd sentence: > OLD > This document analyzes the differences of IPv6 [RFC8200] flows > description from those of traditional IPv4 packets and propose a > subset of new Border Gateway Protocol [RFC4271] encoding formats to > enable Dissemination of Flow Specification Rules > [I-D.ietf-idr-rfc5575bis] for IPv6. > NEW > This document analyzes the differences between describing IPv6 > [RFC8200] flows and those of traditional IPv4 packets. It specifies > new Border Gateway Protocol [RFC4271] encoding formats to enable > Dissemination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis] > for IPv6. >=20 Also edited as suggested. > There are some other minor editorial things like plural/singular > forms but I assume the RFC Editor will fix those. Thanks for the comments. --Apple-Mail=_320F7652-BFA8-44F7-88FE-30AA5F60F338 Content-Disposition: attachment; filename="draft-ietf-idr-flow-spec-v6 (5).txt" Content-Type: text/plain; x-unix-mode=0644; name="draft-ietf-idr-flow-spec-v6 (5).txt" Content-Transfer-Encoding: quoted-printable IDR Working Group C. Loibl, Ed. Internet-Draft next layer Telekom GmbH Updates: I-D.ietf-idr-rfc5575bis (if R. Raszuk, Ed. approved) Bloomberg LP Intended status: Standards Track S. Hares, Ed. Expires: May 8, 2021 Huawei November 4, 2020 Dissemination of Flow Specification Rules for IPv6 draft-ietf-idr-flow-spec-v6-20 Abstract Dissemination of Flow Specification Rules I-D.ietf-idr-rfc5575bis provides a Border Gateway Protocol extension for the propagation of traffic flow information for the purpose of rate limiting or filtering IPv4 protocol data packets. This document extends I-D.ietf-idr-rfc5575bis with IPv6 functionality. It also updates I-D.ietf-idr-rfc5575bis by changing the IANA Flow Spec Component Types registry. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on May 8, 2021. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of Loibl, et al. Expires May 8, 2021 [Page 1] =0C Internet-Draft IPv6 Flow Specification November 2020 publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Definitions of Terms Used in This Memo . . . . . . . . . 3 2. IPv6 Flow Specification encoding in BGP . . . . . . . . . . . 3 3. IPv6 Flow Specification components . . . . . . . . . . . . . 3 3.1. Type 1 - Destination IPv6 Prefix . . . . . . . . . . . . 4 3.2. Type 2 - Source IPv6 Prefix . . . . . . . . . . . . . . . 4 3.3. Type 3 - Upper-Layer Protocol . . . . . . . . . . . . . . 5 3.4. Type 7 - ICMPv6 Type . . . . . . . . . . . . . . . . . . 5 3.5. Type 8 - ICMPv6 Code . . . . . . . . . . . . . . . . . . 5 3.6. Type 12 - Fragment . . . . . . . . . . . . . . . . . . . 6 3.7. Type 13 - Flow Label (new) . . . . . . . . . . . . . . . 6 3.8. Encoding Example . . . . . . . . . . . . . . . . . . . . 7 4. Ordering of Flow Specifications . . . . . . . . . . . . . . . 9 5. Validation Procedure . . . . . . . . . . . . . . . . . . . . 9 6. IPv6 Traffic Filtering Action changes . . . . . . . . . . . . 9 6.1. Redirect IPv6 (rt-redirect-ipv6) Type/Sub-Type 0x80/TBD . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . . 10 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 8.1. Flow Spec IPv6 Component Types . . . . . . . . . . . . . 10 8.1.1. Registry Template . . . . . . . . . . . . . . . . . . 10 8.1.2. Registry Contents . . . . . . . . . . . . . . . . . . 11 8.2. Extended Community Flow Spec IPv6 Actions . . . . . . . . 13 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13 10. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 13 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 14 11.1. Normative References . . . . . . . . . . . . . . . . . . 14 11.2. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Appendix A. Example python code: flow_rule_cmp_v6 . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18 1. Introduction The growing amount of IPv6 traffic in private and public networks requires the extension of tools used in IPv4-only networks to also support IPv6 data packets. This document analyzes the differences between describing IPv6 [RFC8200] flows and those of IPv4 packets. It specifies new Border Loibl, et al. Expires May 8, 2021 [Page 2] =0C Internet-Draft IPv6 Flow Specification November 2020 Gateway Protocol [RFC4271] encoding formats to enable Dissemination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis] for IPv6. This specification is an extension of the base [I-D.ietf-idr-rfc5575bis]. It only defines the delta changes required to support IPv6 while all other definitions and operation mechanisms of Dissemination of Flow Specification Rules will remain in the main specification and will not be repeated here. 1.1. Definitions of Terms Used in This Memo AFI - Address Family Identifier. AS - Autonomous System. NLRI - Network Layer Reachability Information. SAFI - Subsequent Address Family Identifier. VRF - Virtual Routing and Forwarding instance. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 2. IPv6 Flow Specification encoding in BGP [I-D.ietf-idr-rfc5575bis] defines SAFIs 133 (Dissemination of Flow Specification) and 134 (L3VPN Dissemination of Flow Specification) in order to carry the corresponding Flow Specification. Implementations wishing to exchange IPv6 Flow Specifications MUST use BGP's Capability Advertisement facility to exchange the Multiprotocol Extension Capability Code (Code 1) as defined in [RFC4760]. The (AFI, SAFI) pair carried in the Multiprotocol Extension Capability MUST be: (AFI=3D2, SAFI=3D133) for IPv6 Flow Specification, and = (AFI=3D2, SAFI=3D134) for VPNv6 Flow Specification. 3. IPv6 Flow Specification components The encoding of each of the components begins with a type field (1 octet) followed by a variable length parameter. The following sections define component types and parameter encodings for IPv6. Types 4, 5, 6, 9, 10 and 11, as defined in [I-D.ietf-idr-rfc5575bis], also apply to IPv6. Note that IANA is requested to update the "Flow Loibl, et al. Expires May 8, 2021 [Page 3] =0C Internet-Draft IPv6 Flow Specification November 2020 Spec Component Types" registry in order to contain both IPv4 and IPv6 Flow Specification component type numbers in a single registry (Section 8). 3.1. Type 1 - Destination IPv6 Prefix Encoding: Defines the destination prefix to match. The offset has been defined to allow for flexible matching to portions of an IPv6 address where one is required to skip over the first N bits of the address (these bits skipped are often indicated as "don't care" bits). This can be especially useful where part of the IPv6 address consists of an embedded IPv4 address and matching needs to happen only on the embedded IPv4 address. The encoded pattern contains enough octets for the bits used in matching (length minus offset bits). length - The length field indicates the N-th most significant bit in the address where bitwise pattern matching stops. offset - The offset field indicates the number of most significant address bits to skip before bitwise pattern matching starts. pattern - Contains the matching pattern. The length of the pattern is defined by the number of bits needed for pattern matching (length minus offset). padding - The minimum number of bits required to pad the component to an octet boundary. Padding bits MUST be 0 on encoding and MUST be ignored on decoding. length =3D offset =3D 0 matches every address, otherwise length MUST = be in the range offset < length < 129 or the component is malformed. Note: This Flow Specification component can be represented by the notation ipv6address/length if offset is 0, or ipv6address/offset- length. The ipv6address in this notation is the textual IPv6 representation of the pattern shifted to the right by the number of offset bits. See also Section 3.8. 3.2. Type 2 - Source IPv6 Prefix Encoding: Defines the source prefix to match. The length, offset, pattern and padding are the same as in Section 3.1 Loibl, et al. Expires May 8, 2021 [Page 4] =0C Internet-Draft IPv6 Flow Specification November 2020 3.3. Type 3 - Upper-Layer Protocol Encoding: Contains a list of {numeric_op, value} pairs that are used to match the first Next Header value octet in IPv6 packets that is not an extension header and thus indicates that the next item in the packet is the corresponding upper-layer header (see [RFC8200] Section 4). This component uses the Numeric Operator (numeric_op) described in [I-D.ietf-idr-rfc5575bis] Section 4.2.1.1. Type 3 component values SHOULD be encoded as single octet (numeric_op len=3D00). Note: While IPv6 allows for more than one Next Header field in the packet, the main goal of the Type 3 Flow Specification component is to match on the first upper-layer IP protocol value. Therefore the definition is limited to match only on this specific Next Header field in the packet. 3.4. Type 7 - ICMPv6 Type Encoding: Defines a list of {numeric_op, value} pairs used to match the type field of an ICMPv6 packet (see also [RFC4443] Section 2.1). This component uses the Numeric Operator (numeric_op) described in [I-D.ietf-idr-rfc5575bis] Section 4.2.1.1. Type 7 component values SHOULD be encoded as single octet (numeric_op len=3D00). In case of the presence of the ICMPv6 Type component only ICMPv6 packets can match the entire Flow Specification. The ICMPv6 Type component, if present, never matches when the packet's upper-layer IP protocol value is not 58 (ICMPv6), if the packet is fragmented and this is not the first fragment, or if the system is unable to locate the transport header. Different implementations may or may not be able to decode the transport header. 3.5. Type 8 - ICMPv6 Code Encoding: Defines a list of {numeric_op, value} pairs used to match the code field of an ICMPv6 packet (see also [RFC4443] Section 2.1). This component uses the Numeric Operator (numeric_op) described in [I-D.ietf-idr-rfc5575bis] Section 4.2.1.1. Type 8 component values SHOULD be encoded as single octet (numeric_op len=3D00). Loibl, et al. Expires May 8, 2021 [Page 5] =0C Internet-Draft IPv6 Flow Specification November 2020 In case of the presence of the ICMPv6 Code component only ICMPv6 packets can match the entire Flow Specification. The ICMPv6 code component, if present, never matches when the packet's upper-layer IP protocol value is not 58 (ICMPv6), if the packet is fragmented and this is not the first fragment, or if the system is unable to locate the transport header. Different implementations may or may not be able to decode the transport header. 3.6. Type 12 - Fragment Encoding: Defines a list of {bitmask_op, bitmask} pairs used to match specific IP fragments. This component uses the Bitmask Operator (bitmask_op) described in [I-D.ietf-idr-rfc5575bis] Section 4.2.1.2. The Type 12 component bitmask MUST be encoded as single octet bitmask (bitmask_op len=3D00). 0 1 2 3 4 5 6 7 +---+---+---+---+---+---+---+---+ | 0 | 0 | 0 | 0 |LF |FF |IsF| 0 | +---+---+---+---+---+---+---+---+ Figure 1: Fragment Bitmask Operand Bitmask values: IsF - Is a fragment other than the first - match if IPv6 Fragment Header ([RFC8200] Section 4.5) Fragment Offset is not 0 FF - First fragment - match if IPv6 Fragment Header ([RFC8200] Section 4.5) Fragment Offset is 0 AND M flag is 1 LF - Last fragment - match if IPv6 Fragment Header ([RFC8200] Section 4.5) Fragment Offset is not 0 AND M flag is 0 0 - MUST be set to 0 on NLRI encoding, and MUST be ignored during decoding 3.7. Type 13 - Flow Label (new) Encoding: Contains a list of {numeric_op, value} pairs that are used to match the 20-bit Flow Label IPv6 header field ([RFC8200] Section 3). Loibl, et al. Expires May 8, 2021 [Page 6] =0C Internet-Draft IPv6 Flow Specification November 2020 This component uses the Numeric Operator (numeric_op) described in [I-D.ietf-idr-rfc5575bis] Section 4.2.1.1. Type 13 component values SHOULD be encoded as 1-, 2-, or 4-byte quantities (numeric_op len=3D00,= len=3D01 or len=3D10). 3.8. Encoding Example 3.8.1. Example 1 The following example demonstrates the prefix encoding for: "packets from ::1234:5678:9A00:0/64-104 to 2001:DB8::/32 and upper-layer- protocol tcp". +--------+----------------------+-------------------------+----------+ | length | destination | source | ul-proto | +--------+----------------------+-------------------------+----------+ | 0x12 | 01 20 00 20 01 0D B8 | 02 68 40 12 34 56 78 9A | 03 81 06 | +--------+----------------------+-------------------------+----------+ Decoded: +-------+------------+-------------------------------+ | Value | | | +-------+------------+-------------------------------+ | 0x12 | length | 18 octets (len<240 1-octet) | | 0x01 | type | Type 1 - Dest. IPv6 Prefix | | 0x20 | length | 32 bit | | 0x00 | offset | 0 bit | | 0x20 | pattern | | | 0x01 | pattern | | | 0x0D | pattern | | | 0xB8 | pattern | (no padding needed) | | 0x02 | type | Type 2 - Source IPv6 Prefix | | 0x68 | length | 104 bit | | 0x40 | offset | 64 bit | | 0x12 | pattern | | | 0x34 | pattern | | | 0x56 | pattern | | | 0x78 | pattern | | | 0x9A | pattern | (no padding needed) | | 0x03 | type | Type 3 - upper-layer-proto | | 0x81 | numeric_op | end-of-list, value size=3D1, =3D=3D | | 0x06 | value | 06 | +-------+------------+-------------------------------+ This constitutes a NLRI with a NLRI length of 18 octets. Loibl, et al. Expires May 8, 2021 [Page 7] =0C Internet-Draft IPv6 Flow Specification November 2020 Padding is not needed either for the destination prefix pattern (length - offset =3D 32 bit) or for the source prefix pattern (length = - offset =3D 40 bit), as both patterns end on an octet boundary. 3.8.2. Example 2 The following example demonstrates the prefix encoding for: "all packets from ::1234:5678:9A00:0/65-104 to 2001:DB8::/32". +--------+----------------------+-------------------------+ | length | destination | source | +--------+----------------------+-------------------------+ | 0x0f | 01 20 00 20 01 0D B8 | 02 68 41 24 68 ac f1 34 | +--------+----------------------+-------------------------+ Decoded: +-------+-------------+-------------------------------+ | Value | | | +-------+-------------+-------------------------------+ | 0x0f | length | 15 octets (len<240 1-octet) | | 0x01 | type | Type 1 - Dest. IPv6 Prefix | | 0x20 | length | 32 bit | | 0x00 | offset | 0 bit | | 0x20 | pattern | | | 0x01 | pattern | | | 0x0D | pattern | | | 0xB8 | pattern | (no padding needed) | | 0x02 | type | Type 2 - Source IPv6 Prefix | | 0x68 | length | 104 bit | | 0x41 | offset | 65 bit | | 0x24 | pattern | | | 0x68 | pattern | | | 0xac | pattern | | | 0xf1 | pattern | | | 0x34 | pattern/pad | (contains 1 bit padding) | +-------+-------------+-------------------------------+ This constitutes a NLRI with a NLRI length of 15 octets. The source prefix pattern is 104 - 65 =3D 39 bits in length. After = the pattern one bit of padding needs to be added so that the component ends on a octet boundary. However, only the first 39 bits are actually used for bitwise pattern matching starting with a 65 bit offset from the topmost bit of the address. Loibl, et al. Expires May 8, 2021 [Page 8] =0C Internet-Draft IPv6 Flow Specification November 2020 4. Ordering of Flow Specifications The definition for the order of traffic filtering rules from [I-D.ietf-idr-rfc5575bis] Section 5.1 is reused with new consideration for the IPv6 prefix offset. As long as the offsets are equal, the comparison is the same, retaining longest-prefix-match semantics. If the offsets are not equal, the lowest offset has precedence, as this flow matches the most significant bit. The code in Appendix A shows a Python3 implementation of the resulting comparison algorithm. The full code was tested with Python 3.7.2 and can be obtained at https://github.com/stoffi92/draft-ietf- idr-flow-spec-v6/tree/master/flowspec-cmp [1]. 5. Validation Procedure The validation procedure is the same as specified in [I-D.ietf-idr-rfc5575bis] Section 6 with the exception that item a) of the validation procedure should now read as follows: a) A destination prefix component with offset=3D0 is embedded in = the Flow Specification 6. IPv6 Traffic Filtering Action changes Traffic Filtering Actions from [I-D.ietf-idr-rfc5575bis] Section 7 can also be applied to IPv6 Flow Specifications. To allow an IPv6 address specific route-target, a new Traffic Filtering Action IPv6 address specific extended community is specified in Section 6.1 below. 6.1. Redirect IPv6 (rt-redirect-ipv6) Type/Sub-Type 0x80/TBD The redirect IPv6 address specific extended community allows the traffic to be redirected to a VRF routing instance that lists the specified IPv6 address specific route-target in its import policy. If several local instances match this criteria, the choice between them is a local matter (for example, the instance with the lowest Route Distinguisher value can be elected). This extended community uses the same encoding as the IPv6 address specific Route Target extended community [RFC5701] Section 2 with the high-order octet of the Type always set to 0x80 and the Sub-Type always TBD. The Local Administrator sub-field contains a number from a numbering space that is administered by the organization to which the IP Loibl, et al. Expires May 8, 2021 [Page 9] =0C Internet-Draft IPv6 Flow Specification November 2020 address carried in the Global Administrator sub-field has been assigned by an appropriate authority. Interferes with: All BGP Flow Specification redirect Traffic Filtering Actions (with itself and those specified in [I-D.ietf-idr-rfc5575bis] Section 7.4). 7. Security Considerations This document extends the functionality in [I-D.ietf-idr-rfc5575bis] to be applicable to IPv6 data packets. The same Security Considerations from [I-D.ietf-idr-rfc5575bis] now also apply to IPv6 networks. Otherwise, no new security issues are added to the BGP protocol. 8. IANA Considerations This section complies with [RFC7153]. 8.1. Flow Spec IPv6 Component Types IANA has created and maintains a registry entitled "Flow Spec Component Types". IANA is requested to add [this document] to the reference for this registry. Furthermore the registry should be rewritten to also contain the IPv6 Flow Specification Component Types as described below. The registration procedure should remain unchanged. 8.1.1. Registry Template Type Value: Contains the assigned Flow Specification component type value. IPv4 Name: Contains the associated IPv4 Flow Specification component name as specified in [I-D.ietf-idr-rfc5575bis]. IPv6 Name: Contains the associated IPv6 Flow Specification component name as specified in this document. Reference: Contains referenced to the specifications. Loibl, et al. Expires May 8, 2021 [Page 10] =0C Internet-Draft IPv6 Flow Specification November 2020 8.1.2. Registry Contents + Type Value: 0 + IPv4 Name: Reserved + IPv6 Name: Reserved + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 1 + IPv4 Name: Destination Prefix + IPv6 Name: Destination IPv6 Prefix + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 2 + IPv4 Name: Source Prefix + IPv6 Name: Source IPv6 Prefix + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 3 + IPv4 Name: IP Protocol + IPv6 Name: Upper-Layer Protocol + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 4 + IPv4 Name: Port + IPv6 Name: Port + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 5 + IPv4 Name: Destination Port + IPv6 Name: Destination Port + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 6 + IPv4 Name: Source Port + IPv6 Name: Source Port + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 7 + IPv4 Name: ICMP Type + IPv6 Name: ICMPv6 Type + Reference: [I-D.ietf-idr-rfc5575bis] [this document] Loibl, et al. Expires May 8, 2021 [Page 11] =0C Internet-Draft IPv6 Flow Specification November 2020 + Type Value: 8 + IPv4 Name: ICMP Code + IPv6 Name: ICMPv6 Code + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 9 + IPv4 Name: TCP flags + IPv6 Name: TCP flags + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 10 + IPv4 Name: Packet length + IPv6 Name: Packet length + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 11 + IPv4 Name: DSCP + IPv6 Name: DSCP + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 12 + IPv4 Name: Fragment + IPv6 Name: Fragment + Reference: [I-D.ietf-idr-rfc5575bis] [this document] + Type Value: 13 + IPv4 Name: Unassigned + IPv6 Name: Flow Label + Reference: [this document] + Type Value: 14-254 + IPv4 Name: Unassigned + IPv6 Name: Unassigned + Reference: + Type Value: 255 + IPv4 Name: Reserved + IPv6 Name: Reserved + Reference: [I-D.ietf-idr-rfc5575bis] [this document] Loibl, et al. Expires May 8, 2021 [Page 12] =0C Internet-Draft IPv6 Flow Specification November 2020 8.2. Extended Community Flow Spec IPv6 Actions IANA maintains a registry entitled "Generic Transitive Experimental Use Extended Community Sub-Types". For the purpose of this work, IANA is requested to assign a new value: +----------------+--------------------------------+-----------------+ | Sub-Type Value | Name | Reference | +----------------+--------------------------------+-----------------+ | TBD | Flow spec rt-redirect-ipv6 | [this document] | | | format | | +----------------+--------------------------------+-----------------+ Table 1: Registry: Generic Transitive Experimental Use Extended Community Sub-Types 9. Acknowledgements Authors would like to thank Pedro Marques, Hannes Gredler, Bruno Rijsman, Brian Carpenter, and Thomas Mangin for their valuable input. 10. Contributors Danny McPherson Verisign, Inc. Email: dmcpherson@verisign.com Burjiz Pithawala Individual Email: burjizp@gmail.com Andy Karch Cisco Systems 170 West Tasman Drive San Jose, CA 95134 USA Email: akarch@cisco.com Loibl, et al. Expires May 8, 2021 [Page 13] =0C Internet-Draft IPv6 Flow Specification November 2020 11. References 11.1. Normative References [I-D.ietf-idr-rfc5575bis] Loibl, C., Hares, S., Raszuk, R., McPherson, D., and M. Bacher, "Dissemination of Flow Specification Rules", draft-ietf-idr-rfc5575bis-27 (work in progress), October 2020. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC4443] Conta, A., Deering, S., and M. Gupta, Ed., "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification", STD 89, RFC 4443, DOI 10.17487/RFC4443, March 2006, . [RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter, "Multiprotocol Extensions for BGP-4", RFC 4760, DOI 10.17487/RFC4760, January 2007, . [RFC5701] Rekhter, Y., "IPv6 Address Specific BGP Extended Community Attribute", RFC 5701, DOI 10.17487/RFC5701, November 2009, . [RFC7153] Rosen, E. and Y. Rekhter, "IANA Registries for BGP Extended Communities", RFC 7153, DOI 10.17487/RFC7153, March 2014, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", STD 86, RFC 8200, DOI 10.17487/RFC8200, July 2017, . Loibl, et al. Expires May 8, 2021 [Page 14] =0C Internet-Draft IPv6 Flow Specification November 2020 11.2. URIs [1] https://github.com/stoffi92/draft-ietf-idr-flow-spec- v6/tree/master/flowspec-cmp Appendix A. Example python code: flow_rule_cmp_v6 """ Copyright (c) 2020 IETF Trust and the persons identified as authors of draft-ietf-idr-flow-spec-v6. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). """ import itertools import collections import ipaddress EQUAL =3D 0 A_HAS_PRECEDENCE =3D 1 B_HAS_PRECEDENCE =3D 2 IP_DESTINATION =3D 1 IP_SOURCE =3D 2 FS_component =3D collections.namedtuple('FS_component', 'component_type value') class FS_IPv6_prefix_component: def __init__(self, prefix, offset=3D0, component_type=3DIP_DESTINATION): self.offset =3D offset self.component_type =3D component_type # make sure if offset !=3D 0 that non of the # first offset bits are set in the prefix self.value =3D prefix if offset !=3D 0: i =3D ipaddress.IPv6Interface( (self.value.network_address, offset)) if i.network.network_address !=3D \ ipaddress.ip_address('0::0'): raise ValueError('Bits set in the offset') Loibl, et al. Expires May 8, 2021 [Page 15] =0C Internet-Draft IPv6 Flow Specification November 2020 class FS_nlri(object): """ FS_nlri class implementation that allows sorting. By calling .sort() on a array of FS_nlri objects these will be sorted according to the flow_rule_cmp algorithm. Example: nlri =3D [ FS_nlri(components=3D[ FS_component(component_type=3D4, value=3Dbytearray([0,1,2,3,4,5,6])), ]), FS_nlri(components=3D[ FS_component(component_type=3D5, value=3Dbytearray([0,1,2,3,4,5,6])), FS_component(component_type=3D6, value=3Dbytearray([0,1,2,3,4,5,6])), ]), ] nlri.sort() # sorts the array accorinding to the algorithm """ def __init__(self, components =3D None): """ components: list of type FS_component """ self.components =3D components def __lt__(self, other): # use the below algorithm for sorting result =3D flow_rule_cmp_v6(self, other) if result =3D=3D B_HAS_PRECEDENCE: return True else: return False def flow_rule_cmp_v6(a, b): """ Implementation of the flowspec sorting algorithm in draft-ietf-idr-flow-spec-v6. """ for comp_a, comp_b in itertools.zip_longest(a.components, b.components): # If a component type does not exist in one rule # this rule has lower precedence if not comp_a: return B_HAS_PRECEDENCE if not comp_b: Loibl, et al. Expires May 8, 2021 [Page 16] =0C Internet-Draft IPv6 Flow Specification November 2020 return A_HAS_PRECEDENCE # Higher precedence for lower component type if comp_a.component_type < comp_b.component_type: return A_HAS_PRECEDENCE if comp_a.component_type > comp_b.component_type: return B_HAS_PRECEDENCE # component types are equal -> type specific comparison if comp_a.component_type in (IP_DESTINATION, IP_SOURCE): if comp_a.offset < comp_b.offset: return A_HAS_PRECEDENCE if comp_a.offset > comp_b.offset: return B_HAS_PRECEDENCE # both components have the same offset # assuming comp_a.value, comp_b.value of type # ipaddress.IPv6Network # and the offset bits are reset to 0 (since they are # not represented in the NLRI) if comp_a.value.overlaps(comp_b.value): # longest prefixlen has precedence if comp_a.value.prefixlen > \ comp_b.value.prefixlen: return A_HAS_PRECEDENCE if comp_a.value.prefixlen < \ comp_b.value.prefixlen: return B_HAS_PRECEDENCE # components equal -> continue with next # component elif comp_a.value > comp_b.value: return B_HAS_PRECEDENCE elif comp_a.value < comp_b.value: return A_HAS_PRECEDENCE else: # assuming comp_a.value, comp_b.value of type # bytearray if len(comp_a.value) =3D=3D len(comp_b.value): if comp_a.value > comp_b.value: return B_HAS_PRECEDENCE if comp_a.value < comp_b.value: return A_HAS_PRECEDENCE # components equal -> continue with next # component else: common =3D min(len(comp_a.value), len(comp_b.value)) if comp_a.value[:common] > \ comp_b.value[:common]: return B_HAS_PRECEDENCE elif comp_a.value[:common] < \ Loibl, et al. Expires May 8, 2021 [Page 17] =0C Internet-Draft IPv6 Flow Specification November 2020 comp_b.value[:common]: return A_HAS_PRECEDENCE # the first common bytes match elif len(comp_a.value) > len(comp_b.value): return A_HAS_PRECEDENCE else: return B_HAS_PRECEDENCE return EQUAL Authors' Addresses Christoph Loibl (editor) next layer Telekom GmbH Mariahilfer Guertel 37/7 Vienna 1150 AT Phone: +43 664 1176414 Email: cl@tix.at Robert Raszuk (editor) Bloomberg LP 731 Lexington Ave New York City, NY 10022 USA Email: robert@raszuk.net Susan Hares (editor) Huawei 7453 Hickory Hill Saline, MI 48176 USA Email: shares@ndzh.com Loibl, et al. 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