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selftests: pmtu: Add pmtu_vti4_link_add_mtu test

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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: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2018-03-17 02:31:45 +01:00 committed by David S. Miller
parent 5e84430bb8
commit 719e121574
1 changed files with 44 additions and 1 deletions
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45
tools/testing/selftests/net/pmtu.sh
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@ -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