From patchwork Tue Jul 20 19:42:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Iurman X-Patchwork-Id: 481983 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 06F87C07E95 for ; Tue, 20 Jul 2021 19:57:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF43D6113B for ; Tue, 20 Jul 2021 19:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232902AbhGTTPE (ORCPT ); Tue, 20 Jul 2021 15:15:04 -0400 Received: from serv108.segi.ulg.ac.be ([139.165.32.111]:37824 "EHLO serv108.segi.ulg.ac.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232986AbhGTTNU (ORCPT ); Tue, 20 Jul 2021 15:13:20 -0400 Received: from localhost.localdomain (148.24-240-81.adsl-dyn.isp.belgacom.be [81.240.24.148]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by serv108.segi.ulg.ac.be (Postfix) with ESMTPSA id 8C20A200F4B1; Tue, 20 Jul 2021 21:43:25 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 serv108.segi.ulg.ac.be 8C20A200F4B1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uliege.be; s=ulg20190529; t=1626810205; bh=I6IgflmmRTaQWt4yU6RSHdm1rnzyseL8lEZWb8d5ZUc=; h=From:To:Cc:Subject:Date:From; b=CSq2/39cLYVRj0hgX21cLjZI14z/HHGiskUvtPaolC7cigKtwUALe1vy94Do1HhE0 3tH9rrHaDEr4zb7MxW9s4oZoPolZQl1uYjf7U8l0qNRQICztMOt4Ts24j637LUF0tO 1bGywixNXLonbarmXRoWIlr18fQ0cpi3adKxDEEAzw2Ki24wKQuAbslf1a8WkUtGNh qgKYW++Z/mNynOND59VHqLE1FVplhIc/kVCcKq/DKMSkCBxeH8yxXre0s1drQQpCy3 fnLzrPS1r8H+/2uIkoCSdhtjVtRJbgUQiZ5R6WBD2g+WTYcX3Tj6UmYlt0Ep0hdEhd dHEP0LuGtIUpQ== From: Justin Iurman To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org, dsahern@kernel.org, tom@herbertland.com, justin.iurman@uliege.be Subject: [PATCH net-next v5 0/6] Support for the IOAM Pre-allocated Trace with IPv6 Date: Tue, 20 Jul 2021 21:42:55 +0200 Message-Id: <20210720194301.23243-1-justin.iurman@uliege.be> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org v5: - Refine types, min/max and default values for new sysctls - Introduce a "_wide" sysctl for each "ioam6_id" sysctl - Add more validation on headers before processing data - RCU for sc <> ns pointers + appropriate accessors - Generic Netlink policies are now per op, not per family anymore - Address other comments/remarks from Jakub (thanks again) - Revert "__packed" to "__attribute__((packed))" for uapi headers - Add tests to cover the functionality added, as requested by David Ahern v4: - Address warnings from checkpatch (ignore errors related to unnamed bitfields in the first patch) - Use of hweight32 (thanks Jakub) - Remove inline keyword from static functions in C files and let the compiler decide what to do (thanks Jakub) v3: - Fix warning "unused label 'out_unregister_genl'" by adding conditional macro - Fix lwtunnel output redirect bug: dst cache useless in this case, use orig_output instead v2: - Fix warning with static for __ioam6_fill_trace_data - Fix sparse warning with __force when casting __be64 to __be32 - Fix unchecked dereference when removing IOAM namespaces or schemas - exthdrs.c: Don't drop by default (now: ignore) to match the act bits "00" - Add control plane support for the inline insertion (lwtunnel) - Provide uapi structures - Use __net_timestamp if skb->tstamp is empty - Add note about the temporary IANA allocation - Remove support for "removable" TLVs - Remove support for virtual/anonymous tunnel decapsulation In-situ Operations, Administration, and Maintenance (IOAM) records operational and telemetry information in a packet while it traverses a path between two points in an IOAM domain. It is defined in draft-ietf-ippm-ioam-data [1]. IOAM data fields can be encapsulated into a variety of protocols. The IPv6 encapsulation is defined in draft-ietf-ippm-ioam-ipv6-options [2], via extension headers. IOAM can be used to complement OAM mechanisms based on e.g. ICMP or other types of probe packets. This patchset implements support for the Pre-allocated Trace, carried by a Hop-by-Hop. Therefore, a new IPv6 Hop-by-Hop TLV option is introduced, see IANA [3]. The three other IOAM options are not included in this patchset (Incremental Trace, Proof-of-Transit and Edge-to-Edge). The main idea behind the IOAM Pre-allocated Trace is that a node pre-allocates some room in packets for IOAM data. Then, each IOAM node on the path will insert its data. There exist several interesting use- cases, e.g. Fast failure detection/isolation or Smart service selection. Another killer use-case is what we have called Cross-Layer Telemetry, see the demo video on its repository [4], that aims to make the entire stack (L2/L3 -> L7) visible for distributed tracing tools (e.g. Jaeger), instead of the current L5 -> L7 limited view. So, basically, this is a nice feature for the Linux Kernel. This patchset also provides support for the control plane part, but only for the inline insertion (host-to-host use case), through lightweight tunnels. Indeed, for in-transit traffic, the solution is to have an IPv6-in-IPv6 encapsulation, which brings some difficulties and still requires a little bit of work and discussion (ie anonymous tunnel decapsulation and multi egress resolution). - Patch 1: IPv6 IOAM headers definition - Patch 2: Data plane support for Pre-allocated Trace - Patch 3: IOAM Generic Netlink API - Patch 4: Support for IOAM injection with lwtunnels - Patch 5: Documentation for new IOAM sysctls - Patch 6: Test for the IOAM insertion with IPv6 [1] https://tools.ietf.org/html/draft-ietf-ippm-ioam-data [2] https://tools.ietf.org/html/draft-ietf-ippm-ioam-ipv6-options [3] https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters-2 [4] https://github.com/iurmanj/cross-layer-telemetry Justin Iurman (6): uapi: IPv6 IOAM headers definition ipv6: ioam: Data plane support for Pre-allocated Trace ipv6: ioam: IOAM Generic Netlink API ipv6: ioam: Support for IOAM injection with lwtunnels ipv6: ioam: Documentation for new IOAM sysctls selftests: net: Test for the IOAM insertion with IPv6 Documentation/networking/ioam6-sysctl.rst | 26 + Documentation/networking/ip-sysctl.rst | 17 + include/linux/ioam6.h | 13 + include/linux/ioam6_genl.h | 13 + include/linux/ioam6_iptunnel.h | 13 + include/linux/ipv6.h | 3 + include/net/ioam6.h | 67 ++ include/net/netns/ipv6.h | 3 + include/uapi/linux/in6.h | 1 + include/uapi/linux/ioam6.h | 133 +++ include/uapi/linux/ioam6_genl.h | 52 ++ include/uapi/linux/ioam6_iptunnel.h | 20 + include/uapi/linux/ipv6.h | 3 + include/uapi/linux/lwtunnel.h | 1 + net/core/lwtunnel.c | 2 + net/ipv6/Kconfig | 11 + net/ipv6/Makefile | 3 +- net/ipv6/addrconf.c | 37 + net/ipv6/af_inet6.c | 10 + net/ipv6/exthdrs.c | 61 ++ net/ipv6/ioam6.c | 910 +++++++++++++++++++++ net/ipv6/ioam6_iptunnel.c | 274 +++++++ net/ipv6/sysctl_net_ipv6.c | 19 + tools/testing/selftests/net/Makefile | 2 + tools/testing/selftests/net/config | 1 + tools/testing/selftests/net/ioam6.sh | 298 +++++++ tools/testing/selftests/net/ioam6_parser.c | 403 +++++++++ 27 files changed, 2395 insertions(+), 1 deletion(-) create mode 100644 Documentation/networking/ioam6-sysctl.rst create mode 100644 include/linux/ioam6.h create mode 100644 include/linux/ioam6_genl.h create mode 100644 include/linux/ioam6_iptunnel.h create mode 100644 include/net/ioam6.h create mode 100644 include/uapi/linux/ioam6.h create mode 100644 include/uapi/linux/ioam6_genl.h create mode 100644 include/uapi/linux/ioam6_iptunnel.h create mode 100644 net/ipv6/ioam6.c create mode 100644 net/ipv6/ioam6_iptunnel.c create mode 100644 tools/testing/selftests/net/ioam6.sh create mode 100644 tools/testing/selftests/net/ioam6_parser.c