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-rwxr-xr-xtools/testing/selftests/net/pmtu.sh440
1 files changed, 374 insertions, 66 deletions
diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 6c19c148cef8..1e428781a625 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -1,100 +1,180 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
-# Check that route PMTU values match expectations
+# Check that route PMTU values match expectations, and that initial device MTU
+# values are assigned correctly
#
# Tests currently implemented:
#
-# - test_pmtu_vti6_exception
+# - 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
+# created if link layer MTU is not exceeded, then exceed it and check that
+# exception is created with the expected PMTU. The approach described
+# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
+# changes alone won't affect PMTU
+#
+# - pmtu_vti6_exception
# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
# namespaces with matching endpoints. Check that route exception is
# created by exceeding link layer MTU with ping to other endpoint. Then
# decrease and increase MTU of tunnel, checking that route exception PMTU
# changes accordingly
+#
+# - pmtu_vti4_default_mtu
+# Set up vti4 tunnel on top of veth, in two namespaces with matching
+# endpoints. Check that MTU assigned to vti interface is the MTU of the
+# lower layer (veth) minus additional lower layer headers (zero, for veth)
+# minus IPv4 header length
+#
+# - pmtu_vti6_default_mtu
+# Same as above, for IPv6
+#
+# - pmtu_vti4_link_add_mtu
+# Set up vti4 interface passing MTU value at link creation, check MTU is
+# configured, and that link is not created with invalid MTU values
+#
+# - pmtu_vti6_link_add_mtu
+# Same as above, for IPv6
+#
+# - pmtu_vti6_link_change_mtu
+# Set up two dummy interfaces with different MTUs, create a vti6 tunnel
+# and check that configured MTU is used on link creation and changes, and
+# that MTU is properly calculated instead when MTU is not configured from
+# userspace
+
+tests="
+ pmtu_vti6_exception vti6: PMTU exceptions
+ pmtu_vti4_exception vti4: PMTU exceptions
+ pmtu_vti4_default_mtu vti4: default MTU assignment
+ pmtu_vti6_default_mtu vti6: default MTU assignment
+ pmtu_vti4_link_add_mtu vti4: MTU setting on link creation
+ pmtu_vti6_link_add_mtu vti6: MTU setting on link creation
+ pmtu_vti6_link_change_mtu vti6: MTU changes on link changes"
NS_A="ns-$(mktemp -u XXXXXX)"
NS_B="ns-$(mktemp -u XXXXXX)"
ns_a="ip netns exec ${NS_A}"
ns_b="ip netns exec ${NS_B}"
+veth4_a_addr="192.168.1.1"
+veth4_b_addr="192.168.1.2"
+veth4_mask="24"
veth6_a_addr="fd00:1::a"
veth6_b_addr="fd00:1::b"
veth6_mask="64"
+vti4_a_addr="192.168.2.1"
+vti4_b_addr="192.168.2.2"
+vti4_mask="24"
vti6_a_addr="fd00:2::a"
vti6_b_addr="fd00:2::b"
vti6_mask="64"
+dummy6_0_addr="fc00:1000::0"
+dummy6_1_addr="fc00:1001::0"
+dummy6_mask="64"
+
+cleanup_done=1
+err_buf=
+
+err() {
+ err_buf="${err_buf}${1}
+"
+}
+
+err_flush() {
+ echo -n "${err_buf}"
+ err_buf=
+}
+
setup_namespaces() {
- ip netns add ${NS_A} || return 0
+ ip netns add ${NS_A} || return 1
ip netns add ${NS_B}
-
- return 1
}
setup_veth() {
- ${ns_a} ip link add veth_a type veth peer name veth_b || return 0
+ ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
${ns_a} ip link set veth_b netns ${NS_B}
+ ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
+ ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
+
${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
${ns_a} ip link set veth_a up
${ns_b} ip link set veth_b up
-
- return 1
}
-setup_vti6() {
- ${ns_a} ip link add vti_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 || return 0
- ${ns_b} ip link add vti_b type vti6 local ${veth6_b_addr} remote ${veth6_a_addr} key 10
+setup_vti() {
+ proto=${1}
+ veth_a_addr="${2}"
+ veth_b_addr="${3}"
+ vti_a_addr="${4}"
+ vti_b_addr="${5}"
+ vti_mask=${6}
+
+ [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
+
+ ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1
+ ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
- ${ns_a} ip addr add ${vti6_a_addr}/${vti6_mask} dev vti_a
- ${ns_b} ip addr add ${vti6_b_addr}/${vti6_mask} dev vti_b
+ ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
+ ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
- ${ns_a} ip link set vti_a up
- ${ns_b} ip link set vti_b up
+ ${ns_a} ip link set vti${proto}_a up
+ ${ns_b} ip link set vti${proto}_b up
sleep 1
+}
- return 1
+setup_vti4() {
+ setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${vti4_a_addr} ${vti4_b_addr} ${vti4_mask}
+}
+
+setup_vti6() {
+ setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${vti6_a_addr} ${vti6_b_addr} ${vti6_mask}
}
setup_xfrm() {
- ${ns_a} ip -6 xfrm state add src ${veth6_a_addr} dst ${veth6_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 0
- ${ns_a} ip -6 xfrm state add src ${veth6_b_addr} dst ${veth6_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
- ${ns_a} ip -6 xfrm policy add dir out mark 10 tmpl src ${veth6_a_addr} dst ${veth6_b_addr} proto esp mode tunnel
- ${ns_a} ip -6 xfrm policy add dir in mark 10 tmpl src ${veth6_b_addr} dst ${veth6_a_addr} proto esp mode tunnel
+ proto=${1}
+ veth_a_addr="${2}"
+ veth_b_addr="${3}"
+
+ ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1
+ ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
+ ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
+ ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
+
+ ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
+ ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
+ ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
+ ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
+}
- ${ns_b} ip -6 xfrm state add src ${veth6_a_addr} dst ${veth6_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
- ${ns_b} ip -6 xfrm state add src ${veth6_b_addr} dst ${veth6_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
- ${ns_b} ip -6 xfrm policy add dir out mark 10 tmpl src ${veth6_b_addr} dst ${veth6_a_addr} proto esp mode tunnel
- ${ns_b} ip -6 xfrm policy add dir in mark 10 tmpl src ${veth6_a_addr} dst ${veth6_b_addr} proto esp mode tunnel
+setup_xfrm4() {
+ setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
+}
- return 1
+setup_xfrm6() {
+ setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
}
setup() {
- tunnel_type="$1"
-
- [ "$(id -u)" -ne 0 ] && echo "SKIP: need to run as root" && exit 0
-
- setup_namespaces && echo "SKIP: namespaces not supported" && exit 0
- setup_veth && echo "SKIP: veth not supported" && exit 0
+ [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return 1
- case ${tunnel_type} in
- "vti6")
- setup_vti6 && echo "SKIP: vti6 not supported" && exit 0
- setup_xfrm && echo "SKIP: xfrm not supported" && exit 0
- ;;
- *)
- ;;
- esac
+ cleanup_done=0
+ for arg do
+ eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
+ done
}
cleanup() {
+ [ ${cleanup_done} -eq 1 ] && return
ip netns del ${NS_A} 2 > /dev/null
ip netns del ${NS_B} 2 > /dev/null
+ cleanup_done=1
}
mtu() {
@@ -105,59 +185,287 @@ mtu() {
${ns_cmd} ip link set dev ${dev} mtu ${mtu}
}
+mtu_parse() {
+ input="${1}"
+
+ next=0
+ for i in ${input}; do
+ [ ${next} -eq 1 ] && echo "${i}" && return
+ [ "${i}" = "mtu" ] && next=1
+ done
+}
+
+link_get() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ ${ns_cmd} ip link show dev "${name}"
+}
+
+link_get_mtu() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ mtu_parse "$(link_get "${ns_cmd}" ${name})"
+}
+
route_get_dst_exception() {
- dst="${1}"
+ ns_cmd="${1}"
+ dst="${2}"
- ${ns_a} ip route get "${dst}"
+ ${ns_cmd} ip route get "${dst}"
}
route_get_dst_pmtu_from_exception() {
- dst="${1}"
+ ns_cmd="${1}"
+ dst="${2}"
- exception="$(route_get_dst_exception ${dst})"
- next=0
- for i in ${exception}; do
- [ ${next} -eq 1 ] && echo "${i}" && return
- [ "${i}" = "mtu" ] && next=1
- done
+ mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})"
+}
+
+test_pmtu_vti4_exception() {
+ setup namespaces veth vti4 xfrm4 || return 2
+
+ veth_mtu=1500
+ vti_mtu=$((veth_mtu - 20))
+
+ # SPI SN IV ICV pad length next header
+ esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
+ ping_payload=$((esp_payload_rfc4106 - 28))
+
+ mtu "${ns_a}" veth_a ${veth_mtu}
+ mtu "${ns_b}" veth_b ${veth_mtu}
+ mtu "${ns_a}" vti4_a ${vti_mtu}
+ mtu "${ns_b}" vti4_b ${vti_mtu}
+
+ # 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}" ${vti4_b_addr})"
+ if [ "${pmtu}" != "" ]; then
+ err " unexpected exception created with PMTU ${pmtu} for IP payload length ${esp_payload_rfc4106}"
+ return 1
+ fi
+
+ # Now exceed link layer MTU by one byte, check that exception is created
+ ${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}" ${vti4_b_addr})"
+ if [ "${pmtu}" = "" ]; then
+ err " exception not created for IP payload length $((esp_payload_rfc4106 + 1))"
+ return 1
+ fi
+
+ # ...with the right PMTU value
+ if [ ${pmtu} -ne ${esp_payload_rfc4106} ]; then
+ err " wrong PMTU ${pmtu} in exception, expected: ${esp_payload_rfc4106}"
+ return 1
+ fi
}
test_pmtu_vti6_exception() {
- setup vti6
+ setup namespaces veth vti6 xfrm6 || return 2
+ fail=0
# Create route exception by exceeding link layer MTU
mtu "${ns_a}" veth_a 4000
mtu "${ns_b}" veth_b 4000
- mtu "${ns_a}" vti_a 5000
- mtu "${ns_b}" vti_b 5000
+ mtu "${ns_a}" vti6_a 5000
+ mtu "${ns_b}" vti6_b 5000
${ns_a} ping6 -q -i 0.1 -w 2 -s 60000 ${vti6_b_addr} > /dev/null
# Check that exception was created
- if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" = "" ]; then
- echo "FAIL: Tunnel exceeding link layer MTU didn't create route exception"
- exit 1
+ if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" = "" ]; then
+ err " tunnel exceeding link layer MTU didn't create route exception"
+ return 1
fi
# Decrease tunnel MTU, check for PMTU decrease in route exception
- mtu "${ns_a}" vti_a 3000
+ mtu "${ns_a}" vti6_a 3000
- if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" -ne 3000 ]; then
- echo "FAIL: Decreasing tunnel MTU didn't decrease route exception PMTU"
- exit 1
+ if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 3000 ]; then
+ err " decreasing tunnel MTU didn't decrease route exception PMTU"
+ fail=1
fi
# Increase tunnel MTU, check for PMTU increase in route exception
- mtu "${ns_a}" vti_a 9000
- if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" -ne 9000 ]; then
- echo "FAIL: Increasing tunnel MTU didn't increase route exception PMTU"
- exit 1
+ mtu "${ns_a}" vti6_a 9000
+ if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 9000 ]; then
+ err " increasing tunnel MTU didn't increase route exception PMTU"
+ fail=1
fi
- echo "PASS"
+ return ${fail}
}
-trap cleanup EXIT
+test_pmtu_vti4_default_mtu() {
+ setup namespaces veth vti4 || return 2
+
+ # Check that MTU of vti device is MTU of veth minus IPv4 header length
+ veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
+ vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
+ err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
+ return 1
+ fi
+}
+
+test_pmtu_vti6_default_mtu() {
+ setup namespaces veth vti6 || return 2
+
+ # Check that MTU of vti device is MTU of veth minus IPv6 header length
+ veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
+ vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
+ err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
+ return 1
+ fi
+}
+
+test_pmtu_vti4_link_add_mtu() {
+ setup namespaces || return 2
+
+ ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
+ [ $? -ne 0 ] && err " vti not supported" && return 2
+ ${ns_a} ip link del vti4_a
+
+ fail=0
+
+ min=68
+ max=$((65528 - 20))
+ # Check invalid values first
+ for v in $((min - 1)) $((max + 1)); do
+ ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 2>/dev/null
+ # This can fail, or MTU can be adjusted to a proper value
+ [ $? -ne 0 ] && continue
+ mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
+ err " vti tunnel created with invalid MTU ${mtu}"
+ fail=1
+ fi
+ ${ns_a} ip link del vti4_a
+ done
-test_pmtu_vti6_exception
+ # Now check valid values
+ for v in ${min} 1300 ${max}; do
+ ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
+ mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ ${ns_a} ip link del vti4_a
+ if [ "${mtu}" != "${v}" ]; then
+ err " vti MTU ${mtu} doesn't match configured value ${v}"
+ fail=1
+ fi
+ done
+
+ return ${fail}
+}
+
+test_pmtu_vti6_link_add_mtu() {
+ setup namespaces || return 2
+
+ ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
+ [ $? -ne 0 ] && err " vti6 not supported" && return 2
+ ${ns_a} ip link del vti6_a
+
+ fail=0
+
+ min=1280
+ max=$((65535 - 40))
+ # Check invalid values first
+ for v in $((min - 1)) $((max + 1)); do
+ ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 2>/dev/null
+ # This can fail, or MTU can be adjusted to a proper value
+ [ $? -ne 0 ] && continue
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
+ err " vti6 tunnel created with invalid MTU ${v}"
+ fail=1
+ fi
+ ${ns_a} ip link del vti6_a
+ done
+
+ # Now check valid values
+ for v in 1280 1300 $((65535 - 40)); do
+ ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ ${ns_a} ip link del vti6_a
+ if [ "${mtu}" != "${v}" ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value ${v}"
+ fail=1
+ fi
+ done
+
+ return ${fail}
+}
+
+test_pmtu_vti6_link_change_mtu() {
+ setup namespaces || return 2
+
+ ${ns_a} ip link add dummy0 mtu 1500 type dummy
+ [ $? -ne 0 ] && err " dummy not supported" && return 2
+ ${ns_a} ip link add dummy1 mtu 3000 type dummy
+ ${ns_a} ip link set dummy0 up
+ ${ns_a} ip link set dummy1 up
+
+ ${ns_a} ip addr add ${dummy6_0_addr}/${dummy6_mask} dev dummy0
+ ${ns_a} ip addr add ${dummy6_1_addr}/${dummy6_mask} dev dummy1
+
+ fail=0
+
+ # Create vti6 interface bound to device, passing MTU, check it
+ ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne 1300 ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value 1300"
+ fail=1
+ fi
+
+ # Move to another device with different MTU, without passing MTU, check
+ # MTU is adjusted
+ ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_addr} local ${dummy6_1_addr}
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne $((3000 - 40)) ]; then
+ err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
+ fail=1
+ fi
+
+ # Move it back, passing MTU, check MTU is not overridden
+ ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne 1280 ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value 1280"
+ fail=1
+ fi
+
+ return ${fail}
+}
+
+trap cleanup EXIT
-exit 0
+exitcode=0
+desc=0
+IFS="
+"
+for t in ${tests}; do
+ [ $desc -eq 0 ] && name="${t}" && desc=1 && continue || desc=0
+
+ (
+ unset IFS
+ eval test_${name}
+ ret=$?
+ cleanup
+
+ if [ $ret -eq 0 ]; then
+ printf "TEST: %-60s [ OK ]\n" "${t}"
+ elif [ $ret -eq 1 ]; then
+ printf "TEST: %-60s [FAIL]\n" "${t}"
+ err_flush
+ exit 1
+ elif [ $ret -eq 2 ]; then
+ printf "TEST: %-60s [SKIP]\n" "${t}"
+ err_flush
+ fi
+ )
+ [ $? -ne 0 ] && exitcode=1
+done
+
+exit ${exitcode}
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