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Commit 719e1215 authored by Stefano Brivio's avatar Stefano Brivio Committed by David S. Miller
Browse files

selftests: pmtu: Add pmtu_vti4_link_add_mtu test 



This test checks that MTU given on vti link creation is actually
configured, and that tunnel is not created with an invalid MTU
value.

Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5e84430b

tools/testing/selftests/net/pmtu.sh

+44 −1
Original line number Diff line number Diff line
@@ -29,12 +29,17 @@ 
#

# - 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



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_vti6_default_mtu	vti6: default MTU assignment

	pmtu_vti4_link_add_mtu	vti4: MTU setting on link creation"



NS_A="ns-$(mktemp -u XXXXXX)"

NS_B="ns-$(mktemp -u XXXXXX)"
@@ -301,6 +306,44 @@ test_pmtu_vti6_default_mtu() { 
	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



	# 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}

}



trap cleanup EXIT



exitcode=0