Skip to content

Commit 56fd865

Browse files
sbrivio-rhdavem330
sbrivio-rh
authored and
davem330
committed
selftests: pmtu: Introduce FoU and GUE PMTU exceptions tests
Introduce eight tests, for FoU and GUE, with IPv4 and IPv6 payload, on IPv4 and IPv6 transport, that check that PMTU exceptions are created with the right value when exceeding the MTU on a link of the path. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent b8a51b3 commit 56fd865

File tree

1 file changed

+179
-0
lines changed

1 file changed

+179
-0
lines changed

‎tools/testing/selftests/net/pmtu.sh

Lines changed: 179 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -59,6 +59,14 @@
5959
# Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
6060
# VXLAN
6161
#
62+
# - pmtu_ipv{4,6}_fou{4,6}_exception
63+
# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
64+
# (FoU) over IPv4/IPv6, instead of VXLAN
65+
#
66+
# - pmtu_ipv{4,6}_fou{4,6}_exception
67+
# Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6
68+
# encapsulation (GUE) over IPv4/IPv6, instead of VXLAN
69+
#
6270
# - pmtu_vti4_exception
6371
# Set up vti tunnel on top of veth, with xfrm states and policies, in two
6472
# namespaces with matching endpoints. Check that route exception is not
@@ -113,6 +121,14 @@ tests="
113121
pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions
114122
pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions
115123
pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions
124+
pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions
125+
pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions
126+
pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions
127+
pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions
128+
pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions
129+
pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions
130+
pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions
131+
pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions
116132
pmtu_vti6_exception vti6: PMTU exceptions
117133
pmtu_vti4_exception vti4: PMTU exceptions
118134
pmtu_vti4_default_mtu vti4: default MTU assignment
@@ -200,6 +216,89 @@ nsname() {
200216
eval echo \$NS_$1
201217
}
202218

219+
setup_fou_or_gue() {
220+
outer="${1}"
221+
inner="${2}"
222+
encap="${3}"
223+
224+
if [ "${outer}" = "4" ]; then
225+
modprobe fou || return 2
226+
a_addr="${prefix4}.${a_r1}.1"
227+
b_addr="${prefix4}.${b_r1}.1"
228+
if [ "${inner}" = "4" ]; then
229+
type="ipip"
230+
ipproto="4"
231+
else
232+
type="sit"
233+
ipproto="41"
234+
fi
235+
else
236+
modprobe fou6 || return 2
237+
a_addr="${prefix6}:${a_r1}::1"
238+
b_addr="${prefix6}:${b_r1}::1"
239+
if [ "${inner}" = "4" ]; then
240+
type="ip6tnl"
241+
mode="mode ipip6"
242+
ipproto="4 -6"
243+
else
244+
type="ip6tnl"
245+
mode="mode ip6ip6"
246+
ipproto="41 -6"
247+
fi
248+
fi
249+
250+
${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2
251+
${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return 2
252+
253+
${ns_b} ip fou add port 5556 ipproto ${ipproto}
254+
${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
255+
256+
if [ "${inner}" = "4" ]; then
257+
${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
258+
${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
259+
else
260+
${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
261+
${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
262+
fi
263+
264+
${ns_a} ip link set ${encap}_a up
265+
${ns_b} ip link set ${encap}_b up
266+
267+
sleep 1
268+
}
269+
270+
setup_fou44() {
271+
setup_fou_or_gue 4 4 fou
272+
}
273+
274+
setup_fou46() {
275+
setup_fou_or_gue 4 6 fou
276+
}
277+
278+
setup_fou64() {
279+
setup_fou_or_gue 6 4 fou
280+
}
281+
282+
setup_fou66() {
283+
setup_fou_or_gue 6 6 fou
284+
}
285+
286+
setup_gue44() {
287+
setup_fou_or_gue 4 4 gue
288+
}
289+
290+
setup_gue46() {
291+
setup_fou_or_gue 4 6 gue
292+
}
293+
294+
setup_gue64() {
295+
setup_fou_or_gue 6 4 gue
296+
}
297+
298+
setup_gue66() {
299+
setup_fou_or_gue 6 6 gue
300+
}
301+
203302
setup_namespaces() {
204303
for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
205304
ip netns add ${n} || return 1
@@ -627,6 +726,86 @@ test_pmtu_ipv6_geneve6_exception() {
627726
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
628727
}
629728

729+
test_pmtu_ipvX_over_fouY_or_gueY() {
730+
inner_family=${1}
731+
outer_family=${2}
732+
encap=${3}
733+
ll_mtu=4000
734+
735+
setup namespaces routing ${encap}${outer_family}${inner_family} || return 2
736+
trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
737+
"${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
738+
"${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
739+
740+
if [ ${inner_family} -eq 4 ]; then
741+
ping=ping
742+
dst=${tunnel4_b_addr}
743+
else
744+
ping=${ping6}
745+
dst=${tunnel6_b_addr}
746+
fi
747+
748+
if [ "${encap}" = "gue" ]; then
749+
encap_overhead=4
750+
else
751+
encap_overhead=0
752+
fi
753+
754+
if [ ${outer_family} -eq 4 ]; then
755+
# IPv4 header UDP header
756+
exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
757+
else
758+
# IPv6 header Option 4 UDP header
759+
exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
760+
fi
761+
762+
# Create route exception by exceeding link layer MTU
763+
mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
764+
mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
765+
mtu "${ns_b}" veth_B-R1 ${ll_mtu}
766+
mtu "${ns_r1}" veth_R1-B ${ll_mtu}
767+
768+
mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
769+
mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
770+
${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null
771+
772+
# Check that exception was created
773+
pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
774+
check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
775+
}
776+
777+
test_pmtu_ipv4_fou4_exception() {
778+
test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
779+
}
780+
781+
test_pmtu_ipv6_fou4_exception() {
782+
test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
783+
}
784+
785+
test_pmtu_ipv4_fou6_exception() {
786+
test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
787+
}
788+
789+
test_pmtu_ipv6_fou6_exception() {
790+
test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
791+
}
792+
793+
test_pmtu_ipv4_gue4_exception() {
794+
test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
795+
}
796+
797+
test_pmtu_ipv6_gue4_exception() {
798+
test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
799+
}
800+
801+
test_pmtu_ipv4_gue6_exception() {
802+
test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
803+
}
804+
805+
test_pmtu_ipv6_gue6_exception() {
806+
test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
807+
}
808+
630809
test_pmtu_vti4_exception() {
631810
setup namespaces veth vti4 xfrm4 || return 2
632811
trace "${ns_a}" veth_a "${ns_b}" veth_b \

0 commit comments

Comments
 (0)