From patchwork Thu Aug 6 18:51:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Jeanson X-Patchwork-Id: 262678 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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 F2F3EC433E0 for ; Thu, 6 Aug 2020 18:51:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 233AC206A2 for ; Thu, 6 Aug 2020 18:52:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b="XB8NzyUX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728234AbgHFSv5 (ORCPT ); Thu, 6 Aug 2020 14:51:57 -0400 Received: from mail.efficios.com ([167.114.26.124]:39108 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725927AbgHFSv4 (ORCPT ); Thu, 6 Aug 2020 14:51:56 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 001C329BCDA; Thu, 6 Aug 2020 14:51:54 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 5PD73NyQvyqC; Thu, 6 Aug 2020 14:51:54 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 50ED629BCD9; Thu, 6 Aug 2020 14:51:54 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 50ED629BCD9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1596739914; bh=bld7xqCzU4hyPpz7h43GVxMFfXD0eRkS1jq/9gg8780=; h=From:To:Date:Message-Id:MIME-Version; b=XB8NzyUX3oW3N2u/vwu19m31m/mW2a0I99Hh2DIimuXGsYvKNkoYxA+EWumrm1DuI zCA0+Uyu3XQh89p8Vmkq/PEsIp31lXtrP0VBsKEiPZrAOoYJpX3zGg4+dIPqb9zkLh jiYxb36pVvBVLVbnKzd4ZVCJHWOKyBmVjpkK789S04JTi/e3QdzKMXIDQFNrbGRF3f zqdbAWap8DN7Bd8YmhRmwTIdWewgkBOGq3j4MtHekcskxzJNMUrnSyy1G792rSN7r8 Zi2VCvst82rJGMO61KhWecdY9HBByIVkqFBJaNobMF21p38uWxghJ4/yMOspTLiY9X QoTQjir72SefA== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 0E6QIPtzdjbl; Thu, 6 Aug 2020 14:51:54 -0400 (EDT) Received: from localhost.localdomain (96-127-212-112.qc.cable.ebox.net [96.127.212.112]) by mail.efficios.com (Postfix) with ESMTPSA id 0F7E929BCD8; Thu, 6 Aug 2020 14:51:54 -0400 (EDT) From: Michael Jeanson To: David Ahern Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Michael Jeanson , "David S . Miller" , netdev@vger.kernel.org Subject: [PATCH] selftests: Add VRF icmp error route lookup test Date: Thu, 6 Aug 2020 14:51:21 -0400 Message-Id: <20200806185121.19688-1-mjeanson@efficios.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <42cb74c8-9391-cf4c-9e57-7a1d464f8706@gmail.com> References: <42cb74c8-9391-cf4c-9e57-7a1d464f8706@gmail.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The objective is to check that the incoming vrf routing table is selected to send an ICMP error back to the source when the ttl of a packet reaches 1 while it is forwarded between different vrfs. The first test sends a ping with a ttl of 1 from h1 to h2 and parses the output of the command to check that a ttl expired error is received. [This may be flaky, I'm open to suggestions of a more robust approch.] The second test runs traceroute from h1 to h2 and parses the output to check for a hop on r1. Signed-off-by: Michael Jeanson Cc: David Ahern Cc: David S. Miller Cc: netdev@vger.kernel.org --- tools/testing/selftests/net/Makefile | 1 + .../selftests/net/vrf_icmp_error_route.sh | 429 ++++++++++++++++++ 2 files changed, 430 insertions(+) create mode 100755 tools/testing/selftests/net/vrf_icmp_error_route.sh diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 895ec992b2f1..2fc72bc2908c 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -17,6 +17,7 @@ TEST_PROGS += route_localnet.sh TEST_PROGS += reuseaddr_ports_exhausted.sh TEST_PROGS += txtimestamp.sh TEST_PROGS += vrf-xfrm-tests.sh +TEST_PROGS += vrf_icmp_error_route.sh TEST_PROGS_EXTENDED := in_netns.sh TEST_GEN_FILES = socket nettest TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any diff --git a/tools/testing/selftests/net/vrf_icmp_error_route.sh b/tools/testing/selftests/net/vrf_icmp_error_route.sh new file mode 100755 index 000000000000..0b15a886bf5b --- /dev/null +++ b/tools/testing/selftests/net/vrf_icmp_error_route.sh @@ -0,0 +1,429 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (c) 2019 David Ahern . All rights reserved. +# Copyright (c) 2020 Michael Jeanson . All rights reserved. +# +# blue red +# .253 +----+ .253 +# +----| r1 |----+ +# | +----+ | +# +----+ | | +----+ +# | h1 |--------------+ +--------------| h2 | +# +----+ .1 | | .2 +----+ +# 172.16.1/24 | +----+ | 172.16.2/24 +# 2001:db8:16:1/64 +----| r2 |----+ 2001:db8:16:2/64 +# .254 +----+ .254 +# +# +# Route from h1 to h2 goes through r1, incoming vrf blue has a route to the +# outgoing vrf red for the n2 network but red doesn't have a route back to n1. +# Route from h2 to h1 goes through r2. +# +# The objective is to check that the incoming vrf routing table is selected +# to send an ICMP error back to the source when the ttl of a packet reaches 1 +# while it is forwarded between different vrfs. +# +# The first test sends a ping with a ttl of 1 from h1 to h2 and parses the +# output of the command to check that a ttl expired error is received. +# +# The second test runs traceroute from h1 to h2 and parses the output to check +# for a hop on r1. +# +# Requires CONFIG_NET_VRF, CONFIG_VETH, CONFIG_BRIDGE and CONFIG_NET_NS. + +VERBOSE=0 +PAUSE_ON_FAIL=no + +H1_N1_IP=172.16.1.1 +R1_N1_IP=172.16.1.253 +R2_N1_IP=172.16.1.254 + +H1_N1_IP6=2001:db8:16:1::1 +R1_N1_IP6=2001:db8:16:1::253 +R2_N1_IP6=2001:db8:16:1::254 + +H2_N2=172.16.2.0/24 +H2_N2_6=2001:db8:16:2::/64 + +H2_N2_IP=172.16.2.2 +R1_N2_IP=172.16.2.253 +R2_N2_IP=172.16.2.254 + +H2_N2_IP6=2001:db8:16:2::2 +R1_N2_IP6=2001:db8:16:2::253 +R2_N2_IP6=2001:db8:16:2::254 + +################################################################################ +# helpers + +log_section() +{ + echo + echo "###########################################################################" + echo "$*" + echo "###########################################################################" + echo +} + +log_test() +{ + local rc=$1 + local expected=$2 + local msg="$3" + + if [ "${rc}" -eq "${expected}" ]; then + printf "TEST: %-60s [ OK ]\n" "${msg}" + nsuccess=$((nsuccess+1)) + else + ret=1 + nfail=$((nfail+1)) + printf "TEST: %-60s [FAIL]\n" "${msg}" + if [ "${PAUSE_ON_FAIL}" = "yes" ]; then + echo + echo "hit enter to continue, 'q' to quit" + read -r a + [ "$a" = "q" ] && exit 1 + fi + fi +} + +run_cmd() +{ + local cmd="$*" + local out + local rc + + if [ "$VERBOSE" = "1" ]; then + echo "COMMAND: $cmd" + fi + + out=$(eval $cmd 2>&1) + rc=$? + if [ "$VERBOSE" = "1" ] && [ -n "$out" ]; then + echo "$out" + fi + + [ "$VERBOSE" = "1" ] && echo + + return $rc +} + +################################################################################ +# setup and teardown + +cleanup() +{ + local ns + + setup=0 + + for ns in h1 h2 r1 r2; do + ip netns del $ns 2>/dev/null + done +} + +setup_vrf() +{ + local ns=$1 + + ip -netns "${ns}" ru del pref 0 + ip -netns "${ns}" ru add pref 32765 from all lookup local + ip -netns "${ns}" -6 ru del pref 0 + ip -netns "${ns}" -6 ru add pref 32765 from all lookup local +} + +create_vrf() +{ + local ns=$1 + local vrf=$2 + local table=$3 + + ip -netns "${ns}" link add "${vrf}" type vrf table "${table}" + ip -netns "${ns}" link set "${vrf}" up + ip -netns "${ns}" route add vrf "${vrf}" unreachable default metric 8192 + ip -netns "${ns}" -6 route add vrf "${vrf}" unreachable default metric 8192 + + ip -netns "${ns}" addr add 127.0.0.1/8 dev "${vrf}" + ip -netns "${ns}" -6 addr add ::1 dev "${vrf}" nodad +} + +setup() +{ + local ns + + if [ "${setup}" -eq 1 ]; then + return 0 + fi + + # make sure we are starting with a clean slate + cleanup + + setup=1 + + # + # create nodes as namespaces + # + for ns in h1 h2 r1 r2; do + ip netns add $ns + ip -netns $ns li set lo up + + case "${ns}" in + h[12]) ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0 + ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1 + ;; + r[12]) ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1 + ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1 + esac + done + + # + # create interconnects + # + ip -netns h1 li add eth0 type veth peer name r1h1 + ip -netns h1 li set r1h1 netns r1 name eth0 up + + ip -netns h1 li add eth1 type veth peer name r2h1 + ip -netns h1 li set r2h1 netns r2 name eth0 up + + ip -netns h2 li add eth0 type veth peer name r1h2 + ip -netns h2 li set r1h2 netns r1 name eth1 up + + ip -netns h2 li add eth1 type veth peer name r2h2 + ip -netns h2 li set r2h2 netns r2 name eth1 up + + # + # h1 + # + ip -netns h1 li add br0 type bridge + ip -netns h1 li set br0 up + ip -netns h1 addr add dev br0 ${H1_N1_IP}/24 + ip -netns h1 -6 addr add dev br0 ${H1_N1_IP6}/64 nodad + ip -netns h1 li set eth0 master br0 up + ip -netns h1 li set eth1 master br0 up + + # h1 to h2 via r1 + ip -netns h1 ro add ${H2_N2} via ${R1_N1_IP} dev br0 + ip -netns h1 -6 ro add ${H2_N2_6} via "${R1_N1_IP6}" dev br0 + + # + # h2 + # + ip -netns h2 li add br0 type bridge + ip -netns h2 li set br0 up + ip -netns h2 addr add dev br0 ${H2_N2_IP}/24 + ip -netns h2 -6 addr add dev br0 ${H2_N2_IP6}/64 nodad + ip -netns h2 li set eth0 master br0 up + ip -netns h2 li set eth1 master br0 up + + ip -netns h2 ro add default via ${R2_N2_IP} dev br0 + ip -netns h2 -6 ro add default via ${R2_N2_IP6} dev br0 + + # + # r1 + # + setup_vrf r1 + create_vrf r1 blue 1101 + create_vrf r1 red 1102 + ip -netns r1 li set eth0 vrf blue up + ip -netns r1 li set eth1 vrf red up + ip -netns r1 addr add dev eth0 ${R1_N1_IP}/24 + ip -netns r1 -6 addr add dev eth0 ${R1_N1_IP6}/64 nodad + ip -netns r1 addr add dev eth1 ${R1_N2_IP}/24 + ip -netns r1 -6 addr add dev eth1 ${R1_N2_IP6}/64 nodad + + # Route leak from blue to red + ip -netns r1 route add vrf blue ${H2_N2} dev red + ip -netns r1 -6 route add vrf blue ${H2_N2_6} dev red + + # + # r2 + # + ip -netns r2 addr add dev eth0 ${R2_N1_IP}/24 + ip -netns r2 -6 addr add dev eth0 ${R2_N1_IP6}/64 nodad + ip -netns r2 addr add dev eth1 ${R2_N2_IP}/24 + ip -netns r2 -6 addr add dev eth1 ${R2_N2_IP6}/64 nodad + + # Wait for ip config to settle + sleep 2 +} + +check_connectivity4() +{ + ip netns exec h1 ping -c1 -w1 ${H2_N2_IP} >/dev/null 2>&1 +} + +check_connectivity6() +{ + ip netns exec h1 "${ping6}" -c1 -w1 ${H2_N2_IP6} >/dev/null 2>&1 +} + +ipv4_traceroute() +{ + log_section "IPv4: VRF ICMP error route lookup traceroute" + + if [ ! -x "$(command -v traceroute)" ]; then + echo "SKIP: Could not run IPV4 test without traceroute" + return + fi + + setup + + # verify connectivity + if ! check_connectivity4; then + echo "Error: Basic connectivity is broken" + ret=1 + return + fi + + if [ "$VERBOSE" = "1" ]; then + run_cmd ip netns exec h1 traceroute ${H2_N2_IP} + fi + + ip netns exec h1 traceroute ${H2_N2_IP} | grep -q "${R1_N1_IP}" + log_test $? 0 "Traceroute reports a hop on r1" +} + +ipv6_traceroute() +{ + log_section "IPv6: VRF ICMP error route lookup traceroute" + + if [ ! -x "$(command -v traceroute6)" ]; then + echo "SKIP: Could not run IPV6 test without traceroute6" + return + fi + + setup + + # verify connectivity + if ! check_connectivity6; then + echo "Error: Basic connectivity is broken" + ret=1 + return + fi + + if [ "$VERBOSE" = "1" ]; then + run_cmd ip netns exec h1 traceroute6 ${H2_N2_IP6} + fi + + ip netns exec h1 traceroute6 ${H2_N2_IP6} | grep -q "${R1_N1_IP6}" + log_test $? 0 "Traceroute6 reports a hop on r1" +} + +ipv4_ping() +{ + log_section "IPv4: VRF ICMP error route lookup ping" + + setup + + # verify connectivity + if ! check_connectivity4; then + echo "Error: Basic connectivity is broken" + ret=1 + return + fi + + if [ "$VERBOSE" = "1" ]; then + echo "Command to check for ICMP ttl exceeded:" + run_cmd ip netns exec h1 ping -t1 -c1 -W2 ${H2_N2_IP} + fi + + ip netns exec h1 ping -t1 -c1 -W2 ${H2_N2_IP} | grep -q "Time to live exceeded" + log_test $? 0 "Ping received ICMP ttl exceeded" +} + +ipv6_ping() +{ + log_section "IPv6: VRF ICMP error route lookup ping" + + setup + + # verify connectivity + if ! check_connectivity6; then + echo "Error: Basic connectivity is broken" + ret=1 + return + fi + + if [ "$VERBOSE" = "1" ]; then + echo "Command to check for ICMP ttl exceeded:" + run_cmd ip netns exec h1 "${ping6}" -t1 -c1 -W2 ${H2_N2_IP6} + fi + + ip netns exec h1 "${ping6}" -t1 -c1 -W2 ${H2_N2_IP6} | grep -q "Time exceeded: Hop limit" + log_test $? 0 "Ping received ICMP ttl exceeded" +} +################################################################################ +# usage + +usage() +{ + cat < /dev/null 2>&1 && ping6=$(command -v ping6) || ping6=$(command -v ping) + +TESTS_IPV4="ipv4_ping ipv4_traceroute" +TESTS_IPV6="ipv6_ping ipv6_traceroute" + +ret=0 +nsuccess=0 +nfail=0 +setup=0 + +while getopts :46pvh o +do + case $o in + 4) TESTS=ipv4;; + 6) TESTS=ipv6;; + p) PAUSE_ON_FAIL=yes;; + v) VERBOSE=1;; + h) usage; exit 0;; + *) usage; exit 1;; + esac +done + +# +# show user test config +# +if [ -z "$TESTS" ]; then + TESTS="$TESTS_IPV4 $TESTS_IPV6" +elif [ "$TESTS" = "ipv4" ]; then + TESTS="$TESTS_IPV4" +elif [ "$TESTS" = "ipv6" ]; then + TESTS="$TESTS_IPV6" +fi + +for t in $TESTS +do + case $t in + ipv4_ping|ping) ipv4_ping;; + ipv4_traceroute|traceroute) ipv4_traceroute;; + + ipv6_ping|ping) ipv6_ping;; + ipv6_traceroute|traceroute) ipv6_traceroute;; + + # setup namespaces and config, but do not run any tests + setup) setup; exit 0;; + + help) echo "Test names: $TESTS"; exit 0;; + esac +done + +cleanup + +printf "\nTests passed: %3d\n" ${nsuccess} +printf "Tests failed: %3d\n" ${nfail} + +exit $ret