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selftests: pmtu: Introduce tests for IPv4/IPv6 over VXLAN over IPv4/IPv6
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Use a router between endpoints, implemented via namespaces, set a low MTU
between router and destination endpoint, exceed it and check PMTU value in
route exceptions.

v2:
- Change all occurrences of VxLAN to VXLAN (Jiri Benc)
- Introduce IPv4 tests right away, if iproute2 doesn't support the 'df'
  link option they will be skipped (David Ahern)

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Stefano Brivio authored and David S. Miller committed Nov 9, 2018
1 parent b4d3069 commit 5828887
Showing 1 changed file with 125 additions and 18 deletions.
143 changes: 125 additions & 18 deletions tools/testing/selftests/net/pmtu.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,23 @@
# - pmtu_ipv6
# Same as pmtu_ipv4, except for locked PMTU tests, using IPv6
#
# - pmtu_ipv4_vxlan4_exception
# Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel
# over IPv4 between A and B, routed via R1. On the link between R1 and B,
# set a MTU lower than the VXLAN MTU and the MTU on the link between A and
# R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN
# from A to B and check that the PMTU exception is created with the right
# value on A
#
# - pmtu_ipv6_vxlan4_exception
# Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B
#
# - pmtu_ipv4_vxlan6_exception
# Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B
#
# - pmtu_ipv6_vxlan6_exception
# Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B
#
# - pmtu_vti4_exception
# Set up vti tunnel on top of veth, with xfrm states and policies, in two
# namespaces with matching endpoints. Check that route exception is not
Expand Down Expand Up @@ -72,6 +89,10 @@ which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
tests="
pmtu_ipv4_exception ipv4: PMTU exceptions
pmtu_ipv6_exception ipv6: PMTU exceptions
pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions
pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions
pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions
pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions
pmtu_vti6_exception vti6: PMTU exceptions
pmtu_vti4_exception vti4: PMTU exceptions
pmtu_vti4_default_mtu vti4: default MTU assignment
Expand All @@ -95,8 +116,8 @@ ns_r2="ip netns exec ${NS_R2}"
# Addresses are:
# - IPv4: PREFIX4.SEGMENT.ID (/24)
# - IPv6: PREFIX6:SEGMENT::ID (/64)
prefix4="192.168"
prefix6="fd00"
prefix4="10.0"
prefix6="fc00"
a_r1=1
a_r2=2
b_r1=3
Expand Down Expand Up @@ -129,12 +150,12 @@ veth6_a_addr="fd00:1::a"
veth6_b_addr="fd00:1::b"
veth6_mask="64"

vti4_a_addr="192.168.2.1"
vti4_b_addr="192.168.2.2"
vti4_mask="24"
vti6_a_addr="fd00:2::a"
vti6_b_addr="fd00:2::b"
vti6_mask="64"
tunnel4_a_addr="192.168.2.1"
tunnel4_b_addr="192.168.2.2"
tunnel4_mask="24"
tunnel6_a_addr="fd00:2::a"
tunnel6_b_addr="fd00:2::b"
tunnel6_mask="64"

dummy6_0_addr="fc00:1000::0"
dummy6_1_addr="fc00:1001::0"
Expand Down Expand Up @@ -202,11 +223,39 @@ setup_vti() {
}

setup_vti4() {
setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${vti4_a_addr} ${vti4_b_addr} ${vti4_mask}
setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
}

setup_vti6() {
setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${vti6_a_addr} ${vti6_b_addr} ${vti6_mask}
setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
}

setup_vxlan() {
a_addr="${1}"
b_addr="${2}"
opts="${3}"

${ns_a} ip link add vxlan_a type vxlan id 1 local ${a_addr} remote ${b_addr} ttl 64 dstport 4789 ${opts} || return 1
${ns_b} ip link add vxlan_b type vxlan id 1 local ${b_addr} remote ${a_addr} ttl 64 dstport 4789 ${opts}

${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev vxlan_a
${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev vxlan_b

${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev vxlan_a
${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev vxlan_b

${ns_a} ip link set vxlan_a up
${ns_b} ip link set vxlan_b up

sleep 1
}

setup_vxlan4() {
setup_vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
}

setup_vxlan6() {
setup_vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
}

setup_xfrm() {
Expand Down Expand Up @@ -465,6 +514,64 @@ test_pmtu_ipv6_exception() {
test_pmtu_ipvX 6
}

test_pmtu_ipvX_over_vxlanY_exception() {
family=${1}
outer_family=${2}
ll_mtu=4000

if [ ${outer_family} -eq 4 ]; then
setup namespaces routing vxlan4 || return 2
# IPv4 header UDP header VXLAN header Ethernet header
exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
else
setup namespaces routing vxlan6 || return 2
# IPv6 header UDP header VXLAN header Ethernet header
exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
fi

trace "${ns_a}" vxlan_a "${ns_b}" vxlan_b \
"${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
"${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B

if [ ${family} -eq 4 ]; then
ping=ping
dst=${tunnel4_b_addr}
else
ping=${ping6}
dst=${tunnel6_b_addr}
fi

# 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}" vxlan_a $((${ll_mtu} + 1000))
mtu "${ns_b}" vxlan_b $((${ll_mtu} + 1000))
${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null

# Check that exception was created
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on VXLAN interface"
}

test_pmtu_ipv4_vxlan4_exception() {
test_pmtu_ipvX_over_vxlanY_exception 4 4
}

test_pmtu_ipv6_vxlan4_exception() {
test_pmtu_ipvX_over_vxlanY_exception 6 4
}

test_pmtu_ipv4_vxlan6_exception() {
test_pmtu_ipvX_over_vxlanY_exception 4 6
}

test_pmtu_ipv6_vxlan6_exception() {
test_pmtu_ipvX_over_vxlanY_exception 6 6
}

test_pmtu_vti4_exception() {
setup namespaces veth vti4 xfrm4 || return 2
trace "${ns_a}" veth_a "${ns_b}" veth_b \
Expand All @@ -484,14 +591,14 @@ test_pmtu_vti4_exception() {

# Send DF packet without exceeding link layer MTU, check that no
# exception is created
${ns_a} ping -q -M want -i 0.1 -w 2 -s ${ping_payload} ${vti4_b_addr} > /dev/null
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti4_b_addr})"
${ns_a} ping -q -M want -i 0.1 -w 2 -s ${ping_payload} ${tunnel4_b_addr} > /dev/null
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1

# Now exceed link layer MTU by one byte, check that exception is created
# with the right PMTU value
${ns_a} ping -q -M want -i 0.1 -w 2 -s $((ping_payload + 1)) ${vti4_b_addr} > /dev/null
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti4_b_addr})"
${ns_a} ping -q -M want -i 0.1 -w 2 -s $((ping_payload + 1)) ${tunnel4_b_addr} > /dev/null
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
}

Expand All @@ -506,20 +613,20 @@ test_pmtu_vti6_exception() {
mtu "${ns_b}" veth_b 4000
mtu "${ns_a}" vti6_a 5000
mtu "${ns_b}" vti6_b 5000
${ns_a} ${ping6} -q -i 0.1 -w 2 -s 60000 ${vti6_b_addr} > /dev/null
${ns_a} ${ping6} -q -i 0.1 -w 2 -s 60000 ${tunnel6_b_addr} > /dev/null

# Check that exception was created
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})"
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1

# Decrease tunnel MTU, check for PMTU decrease in route exception
mtu "${ns_a}" vti6_a 3000
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})"
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1

# Increase tunnel MTU, check for PMTU increase in route exception
mtu "${ns_a}" vti6_a 9000
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})"
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1

return ${fail}
Expand Down

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