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Subject[PATCH 1/3] selftests: Add VRF icmp error route lookup test
Date
From: Michael Jeanson <mjeanson@efficios.com>

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 <mjeanson@efficios.com>
Cc: David Ahern <dsahern@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
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 9491bbaa0831..a716fbf780b3 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -19,6 +19,7 @@ TEST_PROGS += txtimestamp.sh
TEST_PROGS += vrf-xfrm-tests.sh
TEST_PROGS += rxtimestamp.sh
TEST_PROGS += devlink_port_split.py
+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 <dsahern@gmail.com>. All rights reserved.
+# Copyright (c) 2020 Michael Jeanson <mjeanson@efficios.com>. 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 <<EOF
+usage: ${0##*/} OPTS
+
+ -4 IPv4 tests only
+ -6 IPv6 tests only
+ -p Pause on fail
+ -v verbose mode (show commands and output)
+EOF
+}
+
+################################################################################
+# main
+
+# Some systems don't have a ping6 binary anymore
+command -v ping6 > /dev/null 2>&1 && ping6=$(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
--
2.17.1
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