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selftest: net: add some traceroute tests
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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@arista.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Francesco Ruggeri authored and David S. Miller committed Nov 7, 2019
1 parent 3edcc56 commit 3c28d99
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2 changes: 1 addition & 1 deletion tools/testing/selftests/net/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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322 changes: 322 additions & 0 deletions tools/testing/selftests/net/traceroute.sh
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Original file line number Diff line number Diff line change
@@ -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}

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