#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Validate cached routes in fib{6}_nh that is used by multiple prefixes.
# Validate a different # exception is generated in h0 for each remote host.
#
# h1
# /
# h0 - r1 - h2
# \
# h3
#
# routing in h0 to hN is done with nexthop objects.
source lib.sh
PAUSE_ON_FAIL=no
VERBOSE=0
which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
################################################################################
# helpers
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
[ "$a" = "q" ] && exit 1
fi
fi
[ "$VERBOSE" = "1" ] && echo
}
run_cmd()
{
local cmd="$*"
local out
local rc
if [ "$VERBOSE" = "1" ]; then
echo "COMMAND: $cmd"
fi
out=$(eval $cmd 2>&1)
rc=$?
if [ "$VERBOSE" = "1" -a -n "$out" ]; then
echo "$out"
fi
[ "$VERBOSE" = "1" ] && echo
return $rc
}
################################################################################
# config
create_ns()
{
local ns=${1}
ip netns exec ${ns} sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
case ${ns} in
h*)
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
;;
r*)
ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
;;
esac
}
setup()
{
local ns
local i
#set -e
setup_ns h0 r1 h1 h2 h3
h[0]=$h0
h[1]=$h1
h[2]=$h2
h[3]=$h3
r[1]=$r1
for ns in ${h[0]} ${r[1]} ${h[1]} ${h[2]} ${h[3]}
do
create_ns ${ns}
done
#
# create interconnects
#
for i in 0 1 2 3
do
ip -netns ${h[$i]} li add eth0 type veth peer name r1h${i}
ip -netns ${h[$i]} li set eth0 up
ip -netns ${h[$i]} li set r1h${i} netns ${r[1]} name eth${i} up
ip -netns ${h[$i]} addr add dev eth0 172.16.10${i}.1/24
ip -netns ${h[$i]} -6 addr add dev eth0 2001:db8:10${i}::1/64
ip -netns ${r[1]} addr add dev eth${i} 172.16.10${i}.254/24
ip -netns ${r[1]} -6 addr add dev eth${i} 2001:db8:10${i}::64/64
done
ip -netns ${h[0]} nexthop add id 4 via 172.16.100.254 dev eth0
ip -netns ${h[0]} nexthop add id 6 via 2001:db8:100::64 dev eth0
# routing from ${h[0]} to h1-h3 and back
for i in 1 2 3
do
ip -netns ${h[0]} ro add 172.16.10${i}.0/24 nhid 4
ip -netns ${h[$i]} ro add 172.16.100.0/24 via 172.16.10${i}.254
ip -netns ${h[0]} -6 ro add 2001:db8:10${i}::/64 nhid 6
ip -netns ${h[$i]} -6 ro add 2001:db8:100::/64 via 2001:db8:10${i}::64
done
if [ "$VERBOSE" = "1" ]; then
echo
echo "host 1 config"
ip -netns ${h[0]} li sh
ip -netns ${h[0]} ro sh
ip -netns ${h[0]} -6 ro sh
fi
#set +e
}
cleanup()
{
cleanup_all_ns
}
change_mtu()
{
local hostid=$1
local mtu=$2
run_cmd ip -netns h${hostid} li set eth0 mtu ${mtu}
run_cmd ip -netns ${r1} li set eth${hostid} mtu ${mtu}
}
################################################################################
# validate exceptions
validate_v4_exception()
{
local i=$1
local mtu=$2
local ping_sz=$3
local dst="172.16.10${i}.1"
local h0_ip=172.16.100.1
local r1_ip=172.16.100.254
local rc
if [ ${ping_sz} != "0" ]; then
run_cmd ip netns exec ${h0} ping -s ${ping_sz} -c5 -w5 ${dst}
fi
if [ "$VERBOSE" = "1" ]; then
echo "Route get"
ip -netns ${h0} ro get ${dst}
echo "Searching for:"
echo " cache .* mtu ${mtu}"
echo
fi
ip -netns ${h0} ro get ${dst} | \
grep -q "cache .* mtu ${mtu}"
rc=$?
log_test $rc 0 "IPv4: host 0 to host ${i}, mtu ${mtu}"
}
validate_v6_exception()
{
local i=$1
local mtu=$2
local ping_sz=$3
local dst="2001:db8:10${i}::1"
local h0_ip=2001:db8:100::1
local r1_ip=2001:db8:100::64
local rc
if [ ${ping_sz} != "0" ]; then
run_cmd ip netns exec ${h0} ${ping6} -s ${ping_sz} -c5 -w5 ${dst}
fi
if [ "$VERBOSE" = "1" ]; then
echo "Route get"
ip -netns ${h0} -6 ro get ${dst}
echo "Searching for:"
echo " ${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}"
echo
fi
ip -netns ${h0} -6 ro get ${dst} | \
grep -q "${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}"
rc=$?
log_test $rc 0 "IPv6: host 0 to host ${i}, mtu ${mtu}"
}
################################################################################
# main
while getopts :pv o
do
case $o in
p) PAUSE_ON_FAIL=yes;;
v) VERBOSE=1;;
esac
done
cleanup
setup
sleep 2
cpus=$(cat /sys/devices/system/cpu/online)
cpus="$(seq ${cpus/-/ })"
ret=0
for i in 1 2 3
do
# generate a cached route per-cpu
for c in ${cpus}; do
run_cmd taskset -c ${c} ip netns exec ${h0} ping -c1 -w1 172.16.10${i}.1
[ $? -ne 0 ] && printf "\nERROR: ping to ${h[$i]} failed\n" && ret=1
run_cmd taskset -c ${c} ip netns exec ${h0} ${ping6} -c1 -w1 2001:db8:10${i}::1
[ $? -ne 0 ] && printf "\nERROR: ping6 to ${h[$i]} failed\n" && ret=1
[ $ret -ne 0 ] && break
done
[ $ret -ne 0 ] && break
done
if [ $ret -eq 0 ]; then
# generate different exceptions in h0 for h1, h2 and h3
change_mtu 1 1300
validate_v4_exception 1 1300 1350
validate_v6_exception 1 1300 1350
echo
change_mtu 2 1350
validate_v4_exception 2 1350 1400
validate_v6_exception 2 1350 1400
echo
change_mtu 3 1400
validate_v4_exception 3 1400 1450
validate_v6_exception 3 1400 1450
echo
validate_v4_exception 1 1300 0
validate_v6_exception 1 1300 0
echo
validate_v4_exception 2 1350 0
validate_v6_exception 2 1350 0
echo
validate_v4_exception 3 1400 0
validate_v6_exception 3 1400 0
# targeted deletes to trigger cleanup paths in kernel
ip -netns ${h0} ro del 172.16.102.0/24 nhid 4
ip -netns ${h0} -6 ro del 2001:db8:102::/64 nhid 6
ip -netns ${h0} nexthop del id 4
ip -netns ${h0} nexthop del id 6
fi
cleanup
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