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Message-Id: <20191105224835.D134F95C0C6F@us180.sjc.aristanetworks.com>
Date: Tue, 05 Nov 2019 14:48:35 -0800
From: fruggeri@...sta.com (Francesco Ruggeri)
To: dsahern@...il.com, davem@...emloft.net, shuah@...nel.org,
netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
fruggeri@...sta.com
Subject: [PATCH net-next v2] selftest: net: add some traceroute tests
Added the following traceroute tests.
IPV6:
Verify that in this scenario
------------------------ N2
| |
------ ------ N3 ----
| R1 | | R2 |------|H2|
------ ------ ----
| |
------------------------ N1
|
----
|H1|
----
where H1's default route goes through R1 and R1's default route goes
through R2 over N2, traceroute6 from H1 to H2 reports R2's address
on N2 and not N1.
IPV4:
Verify that traceroute from H1 to H2 shows 1.0.1.1 in this scenario
1.0.3.1/24
---- 1.0.1.3/24 1.0.1.1/24 ---- 1.0.2.1/24 1.0.2.4/24 ----
|H1|--------------------------|R1|--------------------------|H2|
---- N1 ---- N2 ----
where net.ipv4.icmp_errors_use_inbound_ifaddr is set on R1 and
1.0.3.1/24 and 1.0.1.1/24 are respectively R1's primary and secondary
address on N1.
v2: fixed some typos, and have bridge in R1 instead of R2 in IPV6 test.
Signed-off-by: Francesco Ruggeri <fruggeri@...sta.com>
---
tools/testing/selftests/net/Makefile | 2 +-
tools/testing/selftests/net/traceroute.sh | 322 ++++++++++++++++++++++
2 files changed, 323 insertions(+), 1 deletion(-)
create mode 100755 tools/testing/selftests/net/traceroute.sh
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 0bd6b23c97ef..a8e04d665b69 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -10,7 +10,7 @@ TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh
TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh
TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh ipv6_flowlabel.sh
-TEST_PROGS += tcp_fastopen_backup_key.sh fcnal-test.sh l2tp.sh
+TEST_PROGS += tcp_fastopen_backup_key.sh fcnal-test.sh l2tp.sh traceroute.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/traceroute.sh b/tools/testing/selftests/net/traceroute.sh
new file mode 100755
index 000000000000..de9ca97abc30
--- /dev/null
+++ b/tools/testing/selftests/net/traceroute.sh
@@ -0,0 +1,322 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Run traceroute/traceroute6 tests
+#
+
+VERBOSE=0
+PAUSE_ON_FAIL=no
+
+################################################################################
+#
+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 a
+ [ "$a" = "q" ] && exit 1
+ fi
+ fi
+}
+
+run_cmd()
+{
+ local ns
+ local cmd
+ local out
+ local rc
+
+ ns="$1"
+ shift
+ cmd="$*"
+
+ if [ "$VERBOSE" = "1" ]; then
+ printf " COMMAND: $cmd\n"
+ fi
+
+ out=$(eval ip netns exec ${ns} ${cmd} 2>&1)
+ rc=$?
+ if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+ echo " $out"
+ fi
+
+ [ "$VERBOSE" = "1" ] && echo
+
+ return $rc
+}
+
+################################################################################
+# create namespaces and interconnects
+
+create_ns()
+{
+ local ns=$1
+ local addr=$2
+ local addr6=$3
+
+ [ -z "${addr}" ] && addr="-"
+ [ -z "${addr6}" ] && addr6="-"
+
+ ip netns add ${ns}
+
+ ip netns exec ${ns} ip link set lo up
+ if [ "${addr}" != "-" ]; then
+ ip netns exec ${ns} ip addr add dev lo ${addr}
+ fi
+ if [ "${addr6}" != "-" ]; then
+ ip netns exec ${ns} ip -6 addr add dev lo ${addr6}
+ fi
+
+ ip netns exec ${ns} ip ro add unreachable default metric 8192
+ ip netns exec ${ns} ip -6 ro add unreachable default metric 8192
+
+ ip netns exec ${ns} sysctl -qw net.ipv4.ip_forward=1
+ ip netns exec ${ns} sysctl -qw net.ipv6.conf.all.keep_addr_on_down=1
+ ip netns exec ${ns} sysctl -qw net.ipv6.conf.all.forwarding=1
+ ip netns exec ${ns} sysctl -qw net.ipv6.conf.default.forwarding=1
+ ip netns exec ${ns} sysctl -qw net.ipv6.conf.default.accept_dad=0
+}
+
+# create veth pair to connect namespaces and apply addresses.
+connect_ns()
+{
+ local ns1=$1
+ local ns1_dev=$2
+ local ns1_addr=$3
+ local ns1_addr6=$4
+ local ns2=$5
+ local ns2_dev=$6
+ local ns2_addr=$7
+ local ns2_addr6=$8
+
+ ip netns exec ${ns1} ip li add ${ns1_dev} type veth peer name tmp
+ ip netns exec ${ns1} ip li set ${ns1_dev} up
+ ip netns exec ${ns1} ip li set tmp netns ${ns2} name ${ns2_dev}
+ ip netns exec ${ns2} ip li set ${ns2_dev} up
+
+ if [ "${ns1_addr}" != "-" ]; then
+ ip netns exec ${ns1} ip addr add dev ${ns1_dev} ${ns1_addr}
+ fi
+
+ if [ "${ns2_addr}" != "-" ]; then
+ ip netns exec ${ns2} ip addr add dev ${ns2_dev} ${ns2_addr}
+ fi
+
+ if [ "${ns1_addr6}" != "-" ]; then
+ ip netns exec ${ns1} ip addr add dev ${ns1_dev} ${ns1_addr6}
+ fi
+
+ if [ "${ns2_addr6}" != "-" ]; then
+ ip netns exec ${ns2} ip addr add dev ${ns2_dev} ${ns2_addr6}
+ fi
+}
+
+################################################################################
+# traceroute6 test
+#
+# Verify that in this scenario
+#
+# ------------------------ N2
+# | |
+# ------ ------ N3 ----
+# | R1 | | R2 |------|H2|
+# ------ ------ ----
+# | |
+# ------------------------ N1
+# |
+# ----
+# |H1|
+# ----
+#
+# where H1's default route goes through R1 and R1's default route goes
+# through R2 over N2, traceroute6 from H1 to H2 reports R2's address
+# on N2 and not N1.
+#
+# Addresses are assigned as follows:
+#
+# N1: 2000:101::/64
+# N2: 2000:102::/64
+# N3: 2000:103::/64
+#
+# R1's host part of address: 1
+# R2's host part of address: 2
+# H1's host part of address: 3
+# H2's host part of address: 4
+#
+# For example:
+# the IPv6 address of R1's interface on N2 is 2000:102::1/64
+
+cleanup_traceroute6()
+{
+ local ns
+
+ for ns in host-1 host-2 router-1 router-2
+ do
+ ip netns del ${ns} 2>/dev/null
+ done
+}
+
+setup_traceroute6()
+{
+ brdev=br0
+
+ # start clean
+ cleanup_traceroute6
+
+ set -e
+ create_ns host-1
+ create_ns host-2
+ create_ns router-1
+ create_ns router-2
+
+ # Setup N3
+ connect_ns router-2 eth3 - 2000:103::2/64 host-2 eth3 - 2000:103::4/64
+ ip netns exec host-2 ip route add default via 2000:103::2
+
+ # Setup N2
+ connect_ns router-1 eth2 - 2000:102::1/64 router-2 eth2 - 2000:102::2/64
+ ip netns exec router-1 ip route add default via 2000:102::2
+
+ # Setup N1. host-1 and router-2 connect to a bridge in router-1.
+ ip netns exec router-1 ip link add name ${brdev} type bridge
+ ip netns exec router-1 ip link set ${brdev} up
+ ip netns exec router-1 ip addr add 2000:101::1/64 dev ${brdev}
+
+ connect_ns host-1 eth0 - 2000:101::3/64 router-1 eth0 - -
+ ip netns exec router-1 ip link set dev eth0 master ${brdev}
+ ip netns exec host-1 ip route add default via 2000:101::1
+
+ connect_ns router-2 eth1 - 2000:101::2/64 router-1 eth1 - -
+ ip netns exec router-1 ip link set dev eth1 master ${brdev}
+
+ # Prime the network
+ ip netns exec host-1 ping6 -c5 2000:103::4 >/dev/null 2>&1
+
+ set +e
+}
+
+run_traceroute6()
+{
+ if [ ! -x "$(command -v traceroute6)" ]; then
+ echo "SKIP: Could not run IPV6 test without traceroute6"
+ return
+ fi
+
+ setup_traceroute6
+
+ # traceroute6 host-2 from host-1 (expects 2000:102::2)
+ run_cmd host-1 "traceroute6 2000:103::4 | grep -q 2000:102::2"
+ log_test $? 0 "IPV6 traceroute"
+
+ cleanup_traceroute6
+}
+
+################################################################################
+# traceroute test
+#
+# Verify that traceroute from H1 to H2 shows 1.0.1.1 in this scenario
+#
+# 1.0.3.1/24
+# ---- 1.0.1.3/24 1.0.1.1/24 ---- 1.0.2.1/24 1.0.2.4/24 ----
+# |H1|--------------------------|R1|--------------------------|H2|
+# ---- N1 ---- N2 ----
+#
+# where net.ipv4.icmp_errors_use_inbound_ifaddr is set on R1 and
+# 1.0.3.1/24 and 1.0.1.1/24 are respectively R1's primary and secondary
+# address on N1.
+#
+
+cleanup_traceroute()
+{
+ local ns
+
+ for ns in host-1 host-2 router
+ do
+ ip netns del ${ns} 2>/dev/null
+ done
+}
+
+setup_traceroute()
+{
+ # start clean
+ cleanup_traceroute
+
+ set -e
+ create_ns host-1
+ create_ns host-2
+ create_ns router
+
+ connect_ns host-1 eth0 1.0.1.3/24 - \
+ router eth1 1.0.3.1/24 -
+ ip netns exec host-1 ip route add default via 1.0.1.1
+
+ ip netns exec router ip addr add 1.0.1.1/24 dev eth1
+ ip netns exec router sysctl -qw \
+ net.ipv4.icmp_errors_use_inbound_ifaddr=1
+
+ connect_ns host-2 eth0 1.0.2.4/24 - \
+ router eth2 1.0.2.1/24 -
+ ip netns exec host-2 ip route add default via 1.0.2.1
+
+ # Prime the network
+ ip netns exec host-1 ping -c5 1.0.2.4 >/dev/null 2>&1
+
+ set +e
+}
+
+run_traceroute()
+{
+ if [ ! -x "$(command -v traceroute)" ]; then
+ echo "SKIP: Could not run IPV4 test without traceroute"
+ return
+ fi
+
+ setup_traceroute
+
+ # traceroute host-2 from host-1 (expects 1.0.1.1). Takes a while.
+ run_cmd host-1 "traceroute 1.0.2.4 | grep -q 1.0.1.1"
+ log_test $? 0 "IPV4 traceroute"
+
+ cleanup_traceroute
+}
+
+################################################################################
+# Run tests
+
+run_tests()
+{
+ run_traceroute6
+ run_traceroute
+}
+
+################################################################################
+# main
+
+declare -i nfail=0
+declare -i nsuccess=0
+
+while getopts :pv o
+do
+ case $o in
+ p) PAUSE_ON_FAIL=yes;;
+ v) VERBOSE=$(($VERBOSE + 1));;
+ *) exit 1;;
+ esac
+done
+
+run_tests
+
+printf "\nTests passed: %3d\n" ${nsuccess}
+printf "Tests failed: %3d\n" ${nfail}
--
2.19.1
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