#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2019 David Ahern <[email protected]>. All rights reserved.
# Copyright (c) 2020 Michael Jeanson <[email protected]>. All rights reserved.
#
# Requires CONFIG_NET_VRF, CONFIG_VETH, CONFIG_BRIDGE and CONFIG_NET_NS.
#
#
# Symmetric routing topology
#
# blue red
# +----+ .253 +----+ .253 +----+
# | h1 |-------------------| r1 |-------------------| h2 |
# +----+ .1 +----+ .2 +----+
# 172.16.1/24 172.16.2/24
# 2001:db8:16:1/64 2001:db8:16:2/64
#
#
# Route from h1 to h2 and back goes through r1, incoming vrf blue has a route
# to the outgoing vrf red for the n2 network and red has a route back to n1.
# The red VRF interface has a MTU of 1400.
#
# 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.
#
# The third test sends a ping with a packet size of 1450 from h1 to h2 and
# parses the output of the command to check that a fragmentation error is
# received.
#
#
# Asymmetric routing topology
#
# This topology represents a customer setup where the issue with icmp errors
# and VRF route leaking was initialy reported. The MTU test isn't done here
# because of the lack of a return route in the red VRF.
#
# 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.
source lib.sh
VERBOSE=0
PAUSE_ON_FAIL=no
DEFAULT_TTYPE=sym
H1_N1=172.16.1.0/24
H1_N1_6=2001:db8:16:1::/64
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: $cmd"
fi
# shellcheck disable=SC2086
out=$(eval $cmd 2>&1)
rc=$?
if [ "$VERBOSE" = "1" ] && [ -n "$out" ]; then
echo "$out"
fi
[ "$VERBOSE" = "1" ] && echo
return $rc
}
run_cmd_grep()
{
local grep_pattern="$1"
shift
local cmd="$*"
local out
local rc
if [ "$VERBOSE" = "1" ]; then
echo "COMMAND: $cmd"
fi
# shellcheck disable=SC2086
out=$(eval $cmd 2>&1)
if [ "$VERBOSE" = "1" ] && [ -n "$out" ]; then
echo "$out"
fi
echo "$out" | grep -q "$grep_pattern"
rc=$?
[ "$VERBOSE" = "1" ] && echo
return $rc
}
################################################################################
# setup and teardown
cleanup()
{
cleanup_ns $h1 $h2 $r1 $r2
}
setup_vrf()
{
local ns=$1
ip -netns "${ns}" rule del pref 0
ip -netns "${ns}" rule add pref 32765 from all lookup local
ip -netns "${ns}" -6 rule del pref 0
ip -netns "${ns}" -6 rule 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_sym()
{
local ns
# make sure we are starting with a clean slate
cleanup
#
# create nodes as namespaces
setup_ns h1 h2 r1
for ns in $h1 $h2 $r1; do
if echo $ns | grep -q h[12]-; then
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
else
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
fi
done
#
# create interconnects
#
ip -netns $h1 link add eth0 type veth peer name r1h1
ip -netns $h1 link set r1h1 netns $r1 name eth0 up
ip -netns $h2 link add eth0 type veth peer name r1h2
ip -netns $h2 link set r1h2 netns $r1 name eth1 up
#
# h1
#
ip -netns $h1 addr add dev eth0 ${H1_N1_IP}/24
ip -netns $h1 -6 addr add dev eth0 ${H1_N1_IP6}/64 nodad
ip -netns $h1 link set eth0 up
# h1 to h2 via r1
ip -netns $h1 route add ${H2_N2} via ${R1_N1_IP} dev eth0
ip -netns $h1 -6 route add ${H2_N2_6} via "${R1_N1_IP6}" dev eth0
#
# h2
#
ip -netns $h2 addr add dev eth0 ${H2_N2_IP}/24
ip -netns $h2 -6 addr add dev eth0 ${H2_N2_IP6}/64 nodad
ip -netns $h2 link set eth0 up
# h2 to h1 via r1
ip -netns $h2 route add default via ${R1_N2_IP} dev eth0
ip -netns $h2 -6 route add default via ${R1_N2_IP6} dev eth0
#
# r1
#
setup_vrf $r1
create_vrf $r1 blue 1101
create_vrf $r1 red 1102
ip -netns $r1 link set mtu 1400 dev eth1
ip -netns $r1 link set eth0 vrf blue up
ip -netns $r1 link 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
# Route leak from red to blue
ip -netns $r1 route add vrf red ${H1_N1} dev blue
ip -netns $r1 -6 route add vrf red ${H1_N1_6} dev blue
# Wait for ip config to settle
sleep 2
}
setup_asym()
{
local ns
# make sure we are starting with a clean slate
cleanup
#
# create nodes as namespaces
setup_ns h1 h2 r1 r2
for ns in $h1 $h2 $r1 $r2; do
if echo $ns | grep -q h[12]-; then
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
else
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
fi
done
#
# create interconnects
#
ip -netns $h1 link add eth0 type veth peer name r1h1
ip -netns $h1 link set r1h1 netns $r1 name eth0 up
ip -netns $h1 link add eth1 type veth peer name r2h1
ip -netns $h1 link set r2h1 netns $r2 name eth0 up
ip -netns $h2 link add eth0 type veth peer name r1h2
ip -netns $h2 link set r1h2 netns $r1 name eth1 up
ip -netns $h2 link add eth1 type veth peer name r2h2
ip -netns $h2 link set r2h2 netns $r2 name eth1 up
#
# h1
#
ip -netns $h1 link add br0 type bridge
ip -netns $h1 link 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 link set eth0 master br0 up
ip -netns $h1 link set eth1 master br0 up
# h1 to h2 via r1
ip -netns $h1 route add ${H2_N2} via ${R1_N1_IP} dev br0
ip -netns $h1 -6 route add ${H2_N2_6} via "${R1_N1_IP6}" dev br0
#
# h2
#
ip -netns $h2 link add br0 type bridge
ip -netns $h2 link 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 link set eth0 master br0 up
ip -netns $h2 link set eth1 master br0 up
# h2 to h1 via r2
ip -netns $h2 route add default via ${R2_N2_IP} dev br0
ip -netns $h2 -6 route 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 link set mtu 1400 dev eth1
ip -netns $r1 link set eth0 vrf blue up
ip -netns $r1 link 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
# No route leak from red to blue
#
# 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_connectivity()
{
ip netns exec $h1 ping -c1 -w1 ${H2_N2_IP} >/dev/null 2>&1
log_test $? 0 "Basic IPv4 connectivity"
return $?
}
check_connectivity6()
{
ip netns exec $h1 "${ping6}" -c1 -w1 ${H2_N2_IP6} >/dev/null 2>&1
log_test $? 0 "Basic IPv6 connectivity"
return $?
}
check_traceroute()
{
if [ ! -x "$(command -v traceroute)" ]; then
echo "SKIP: Could not run IPV4 test without traceroute"
return 1
fi
}
check_traceroute6()
{
if [ ! -x "$(command -v traceroute6)" ]; then
echo "SKIP: Could not run IPV6 test without traceroute6"
return 1
fi
}
ipv4_traceroute()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv4 ($ttype route): VRF ICMP error route lookup traceroute"
check_traceroute || return
setup_"$ttype"
check_connectivity || return
run_cmd_grep "${R1_N1_IP}" ip netns exec $h1 traceroute ${H2_N2_IP}
log_test $? 0 "Traceroute reports a hop on r1"
}
ipv4_traceroute_asym()
{
ipv4_traceroute asym
}
ipv6_traceroute()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv6 ($ttype route): VRF ICMP error route lookup traceroute"
check_traceroute6 || return
setup_"$ttype"
check_connectivity6 || return
run_cmd_grep "${R1_N1_IP6}" ip netns exec $h1 traceroute6 ${H2_N2_IP6}
log_test $? 0 "Traceroute6 reports a hop on r1"
}
ipv6_traceroute_asym()
{
ipv6_traceroute asym
}
ipv4_ping_ttl()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv4 ($ttype route): VRF ICMP ttl error route lookup ping"
setup_"$ttype"
check_connectivity || return
run_cmd_grep "Time to live exceeded" ip netns exec $h1 ping -t1 -c1 -W2 ${H2_N2_IP}
log_test $? 0 "Ping received ICMP ttl exceeded"
}
ipv4_ping_ttl_asym()
{
ipv4_ping_ttl asym
}
ipv4_ping_frag()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv4 ($ttype route): VRF ICMP fragmentation error route lookup ping"
setup_"$ttype"
check_connectivity || return
run_cmd_grep "Frag needed" ip netns exec $h1 ping -s 1450 -Mdo -c1 -W2 ${H2_N2_IP}
log_test $? 0 "Ping received ICMP Frag needed"
}
ipv4_ping_frag_asym()
{
ipv4_ping_frag asym
}
ipv6_ping_ttl()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv6 ($ttype route): VRF ICMP ttl error route lookup ping"
setup_"$ttype"
check_connectivity6 || return
run_cmd_grep "Time exceeded: Hop limit" ip netns exec $h1 "${ping6}" -t1 -c1 -W2 ${H2_N2_IP6}
log_test $? 0 "Ping received ICMP Hop limit"
}
ipv6_ping_ttl_asym()
{
ipv6_ping_ttl asym
}
ipv6_ping_frag()
{
local ttype="$1"
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
log_section "IPv6 ($ttype route): VRF ICMP fragmentation error route lookup ping"
setup_"$ttype"
check_connectivity6 || return
run_cmd_grep "Packet too big" ip netns exec $h1 "${ping6}" -s 1450 -Mdo -c1 -W2 ${H2_N2_IP6}
log_test $? 0 "Ping received ICMP Packet too big"
}
ipv6_ping_frag_asym()
{
ipv6_ping_frag asym
}
ipv4_ping_local()
{
log_section "IPv4 (sym route): VRF ICMP local error route lookup ping"
setup_sym
check_connectivity || return
run_cmd ip netns exec $r1 ip vrf exec blue ping -c1 -w1 ${H2_N2_IP}
log_test $? 0 "VRF ICMP local IPv4"
}
ipv4_tcp_local()
{
log_section "IPv4 (sym route): VRF tcp local connection"
setup_sym
check_connectivity || return
run_cmd nettest -s -O "$h2" -l ${H2_N2_IP} -I eth0 -3 eth0 &
sleep 1
run_cmd nettest -N "$r1" -d blue -r ${H2_N2_IP}
log_test $? 0 "VRF tcp local connection IPv4"
}
ipv4_udp_local()
{
log_section "IPv4 (sym route): VRF udp local connection"
setup_sym
check_connectivity || return
run_cmd nettest -s -D -O "$h2" -l ${H2_N2_IP} -I eth0 -3 eth0 &
sleep 1
run_cmd nettest -D -N "$r1" -d blue -r ${H2_N2_IP}
log_test $? 0 "VRF udp local connection IPv4"
}
ipv6_ping_local()
{
log_section "IPv6 (sym route): VRF ICMP local error route lookup ping"
setup_sym
check_connectivity6 || return
run_cmd ip netns exec $r1 ip vrf exec blue ${ping6} -c1 -w1 ${H2_N2_IP6}
log_test $? 0 "VRF ICMP local IPv6"
}
ipv6_tcp_local()
{
log_section "IPv6 (sym route): VRF tcp local connection"
setup_sym
check_connectivity6 || return
run_cmd nettest -s -6 -O "$h2" -l ${H2_N2_IP6} -I eth0 -3 eth0 &
sleep 1
run_cmd nettest -6 -N "$r1" -d blue -r ${H2_N2_IP6}
log_test $? 0 "VRF tcp local connection IPv6"
}
ipv6_udp_local()
{
log_section "IPv6 (sym route): VRF udp local connection"
setup_sym
check_connectivity6 || return
run_cmd nettest -s -6 -D -O "$h2" -l ${H2_N2_IP6} -I eth0 -3 eth0 &
sleep 1
run_cmd nettest -6 -D -N "$r1" -d blue -r ${H2_N2_IP6}
log_test $? 0 "VRF udp local connection IPv6"
}
################################################################################
# usage
usage()
{
cat <<EOF
usage: ${0##*/} OPTS
-4 Run IPv4 tests only
-6 Run IPv6 tests only
-t TEST Run only TEST
-p Pause on fail
-v verbose mode (show commands and output)
EOF
}
################################################################################
# main
# Some systems don't have a ping6 binary anymore
command -v ping6 > /dev/null 2>&1 && ping6=$(command -v ping6) || ping6=$(command -v ping)
check_gen_prog "nettest"
TESTS_IPV4="ipv4_ping_ttl ipv4_traceroute ipv4_ping_frag ipv4_ping_local ipv4_tcp_local
ipv4_udp_local ipv4_ping_ttl_asym ipv4_traceroute_asym"
TESTS_IPV6="ipv6_ping_ttl ipv6_traceroute ipv6_ping_local ipv6_tcp_local ipv6_udp_local
ipv6_ping_ttl_asym ipv6_traceroute_asym"
ret=0
nsuccess=0
nfail=0
while getopts :46t:pvh o
do
case $o in
4) TESTS=ipv4;;
6) TESTS=ipv6;;
t) TESTS=$OPTARG;;
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_ttl|ping) ipv4_ping_ttl;;&
ipv4_ping_ttl_asym|ping) ipv4_ping_ttl_asym;;&
ipv4_traceroute|traceroute) ipv4_traceroute;;&
ipv4_traceroute_asym|traceroute) ipv4_traceroute_asym;;&
ipv4_ping_frag|ping) ipv4_ping_frag;;&
ipv4_ping_local|ping) ipv4_ping_local;;&
ipv4_tcp_local) ipv4_tcp_local;;&
ipv4_udp_local) ipv4_udp_local;;&
ipv6_ping_ttl|ping) ipv6_ping_ttl;;&
ipv6_ping_ttl_asym|ping) ipv6_ping_ttl_asym;;&
ipv6_traceroute|traceroute) ipv6_traceroute;;&
ipv6_traceroute_asym|traceroute) ipv6_traceroute_asym;;&
ipv6_ping_frag|ping) ipv6_ping_frag;;&
ipv6_ping_local|ping) ipv6_ping_local;;&
ipv6_tcp_local) ipv6_tcp_local;;&
ipv6_udp_local) ipv6_udp_local;;&
# setup namespaces and config, but do not run any tests
setup_sym|setup) setup_sym; exit 0;;
setup_asym) setup_asym; 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
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