2 # SPDX-License-Identifier: GPL-2.0
4 # Check that route PMTU values match expectations
6 # Tests currently implemented:
8 # - test_pmtu_vti6_exception
9 # Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
10 # namespaces with matching endpoints. Check that route exception is
11 # created by exceeding link layer MTU with ping to other endpoint. Then
12 # decrease and increase MTU of tunnel, checking that route exception PMTU
15 NS_A="ns-$(mktemp -u XXXXXX)"
16 NS_B="ns-$(mktemp -u XXXXXX)"
17 ns_a="ip netns exec ${NS_A}"
18 ns_b="ip netns exec ${NS_B}"
20 veth6_a_addr="fd00:1::a"
21 veth6_b_addr="fd00:1::b"
24 vti6_a_addr="fd00:2::a"
25 vti6_b_addr="fd00:2::b"
29 ip netns add ${NS_A} || return 0
36 ${ns_a} ip link add veth_a type veth peer name veth_b || return 0
37 ${ns_a} ip link set veth_b netns ${NS_B}
39 ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
40 ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
42 ${ns_a} ip link set veth_a up
43 ${ns_b} ip link set veth_b up
49 ${ns_a} ip link add vti_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 || return 0
50 ${ns_b} ip link add vti_b type vti6 local ${veth6_b_addr} remote ${veth6_a_addr} key 10
52 ${ns_a} ip addr add ${vti6_a_addr}/${vti6_mask} dev vti_a
53 ${ns_b} ip addr add ${vti6_b_addr}/${vti6_mask} dev vti_b
55 ${ns_a} ip link set vti_a up
56 ${ns_b} ip link set vti_b up
64 ${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
65 ${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
66 ${ns_a} ip -6 xfrm policy add dir out mark 10 tmpl src ${veth6_a_addr} dst ${veth6_b_addr} proto esp mode tunnel
67 ${ns_a} ip -6 xfrm policy add dir in mark 10 tmpl src ${veth6_b_addr} dst ${veth6_a_addr} proto esp mode tunnel
69 ${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
70 ${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
71 ${ns_b} ip -6 xfrm policy add dir out mark 10 tmpl src ${veth6_b_addr} dst ${veth6_a_addr} proto esp mode tunnel
72 ${ns_b} ip -6 xfrm policy add dir in mark 10 tmpl src ${veth6_a_addr} dst ${veth6_b_addr} proto esp mode tunnel
80 [ "$(id -u)" -ne 0 ] && echo "SKIP: need to run as root" && exit 0
82 setup_namespaces && echo "SKIP: namespaces not supported" && exit 0
83 setup_veth && echo "SKIP: veth not supported" && exit 0
85 case ${tunnel_type} in
87 setup_vti6 && echo "SKIP: vti6 not supported" && exit 0
88 setup_xfrm && echo "SKIP: xfrm not supported" && exit 0
96 ip netns del ${NS_A} 2 > /dev/null
97 ip netns del ${NS_B} 2 > /dev/null
105 ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
108 route_get_dst_exception() {
111 ${ns_a} ip route get "${dst}"
114 route_get_dst_pmtu_from_exception() {
117 exception="$(route_get_dst_exception ${dst})"
119 for i in ${exception}; do
120 [ ${next} -eq 1 ] && echo "${i}" && return
121 [ "${i}" = "mtu" ] && next=1
125 test_pmtu_vti6_exception() {
128 # Create route exception by exceeding link layer MTU
129 mtu "${ns_a}" veth_a 4000
130 mtu "${ns_b}" veth_b 4000
131 mtu "${ns_a}" vti_a 5000
132 mtu "${ns_b}" vti_b 5000
133 ${ns_a} ping6 -q -i 0.1 -w 2 -s 60000 ${vti6_b_addr} > /dev/null
135 # Check that exception was created
136 if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" = "" ]; then
137 echo "FAIL: Tunnel exceeding link layer MTU didn't create route exception"
141 # Decrease tunnel MTU, check for PMTU decrease in route exception
142 mtu "${ns_a}" vti_a 3000
144 if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" -ne 3000 ]; then
145 echo "FAIL: Decreasing tunnel MTU didn't decrease route exception PMTU"
149 # Increase tunnel MTU, check for PMTU increase in route exception
150 mtu "${ns_a}" vti_a 9000
151 if [ "$(route_get_dst_pmtu_from_exception ${vti6_b_addr})" -ne 9000 ]; then
152 echo "FAIL: Increasing tunnel MTU didn't increase route exception PMTU"
161 test_pmtu_vti6_exception