check_command() {

cmd=${1}

if ! which ${cmd} > /dev/null 2>&1; then

err " missing required command: '${cmd}'"

return 1

fi

return 0

}

test_cleanup_vxlanX_exception() {

outer="${1}"

encap="vxlan"

ll_mtu=4000

check_command taskset || return 2

cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)

setup namespaces routing ${encap}${outer} || return 2

trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \

"${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \

"${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B

# Create route exception by exceeding link layer MTU

mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))

mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))

mtu "${ns_b}" veth_B-R1 ${ll_mtu}

mtu "${ns_r1}" veth_R1-B ${ll_mtu}

mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))

mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))

# Fill exception cache for multiple CPUs (2)

# we can always use inner IPv4 for that

for cpu in ${cpu_list}; do

taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} > /dev/null

done

${ns_a} ip link del dev veth_A-R1 &

iplink_pid=$!

sleep 1

if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then

err " can't delete veth device in a timely manner, PMTU dst likely leaked"

return 1

fi

}

test_cleanup_ipv6_exception() {

test_cleanup_vxlanX_exception 6

}

test_cleanup_ipv4_exception() {

test_cleanup_vxlanX_exception 4

}