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Commit a41c789b authored by Stefano Brivio's avatar Stefano Brivio Committed by David S. Miller
Browse files

selftests: pmtu: Add pmtu_vti4_default_mtu test 



This test checks that the MTU assigned by default to a vti (IPv4)
interface created on top of veth is simply veth's MTU minus the
length of the encapsulated IPv4 header.

Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36455bd1

tools/testing/selftests/net/pmtu.sh

+73 −13
Original line number Diff line number Diff line 
#!/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:

#
@@ -11,19 +12,32 @@ 
#	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



tests="

	pmtu_vti6_exception	vti6: PMTU exceptions"

	pmtu_vti6_exception	vti6: PMTU exceptions

	pmtu_vti4_default_mtu	vti4: default MTU assignment"



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"
@@ -50,6 +64,9 @@ setup_veth() { 
	${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
@@ -57,19 +74,36 @@ setup_veth() { 
	${ns_b} ip link set veth_b up

}



setup_vti6() {

	${ns_a} ip link add vti_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 || return 1

	${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}



	${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

	[ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"



	${ns_a} ip link set vti_a up

	${ns_b} ip link set vti_b up

	${ns_a} ip link add vti${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 ${vti_a_addr}/${vti_mask} dev vti${proto}_a

	${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b



	${ns_a} ip link set vti${proto}_a up

	${ns_b} ip link set vti${proto}_b up



	sleep 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 1

	${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
@@ -116,6 +150,20 @@ mtu_parse() { 
	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() {

	ns_cmd="${1}"

	dst="${2}"
@@ -137,8 +185,8 @@ test_pmtu_vti6_exception() { 
	# 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
@@ -148,7 +196,7 @@ test_pmtu_vti6_exception() { 
	fi



	# Decrease tunnel MTU, check for PMTU decrease in route exception

	mtu "${ns_a}" vti_a 3000

	mtu "${ns_a}" vti6_a 3000



	if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 3000 ]; then

		err "  decreasing tunnel MTU didn't decrease route exception PMTU"
@@ -156,7 +204,7 @@ test_pmtu_vti6_exception() { 
	fi



	# Increase tunnel MTU, check for PMTU increase in route exception

	mtu "${ns_a}" vti_a 9000

	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
@@ -165,6 +213,18 @@ test_pmtu_vti6_exception() { 
	return ${fail}

}



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

}



trap cleanup EXIT



exitcode=0