selftests: forwarding: Add a test for VxLAN symmetric routing with IPv6

In a similar fashion to the asymmetric test, add a test for symmetric
routing. In symmetric routing both the ingress and egress VTEPs perform
routing in the overlay network into / from the VxLAN tunnel. Packets in
different directions use the same VNI - the L3 VNI.
Different tenants (VRFs) use different L3 VNIs.

Add a test which is similar to the existing IPv4 test to check IPv6.

Signed-off-by: Amit Cohen <[e-mail]>
Reviewed-by: Petr Machata <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/forwarding/vxlan_symmetric_ipv6.sh

···
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+
+# +--------------------------------+            +-----------------------------+
+# |                         vrf-h1 |            |                      vrf-h2 |
+# |    + $h1                       |            | + $h2                       |
+# |    | 2001:db8:1::1/64          |            | | 2001:db8:2::1/64          |
+# |    | default via 2001:db8:1::3 |            | | default via 2001:db8:2::3 |
+# +----|---------------------------+            +-|---------------------------+
+#      |                                          |
+# +----|------------------------------------------|---------------------------+
+# | SW |                                          |                           |
+# | +--|------------------------------------------|-------------------------+ |
+# | |  + $swp1                         br1          + $swp2                 | |
+# | |     vid 10 pvid untagged                         vid 20 pvid untagged | |
+# | |                                                                       | |
+# | |  + vx10                                       + vx20                  | |
+# | |    local 2001:db8:3::1                          local 2001:db8:3::1   | |
+# | |    remote 2001:db8:3::2                         remote 2001:db8:3::2  | |
+# | |    id 1010                                      id 1020               | |
+# | |    dstport 4789                                 dstport 4789          | |
+# | |    vid 10 pvid untagged                         vid 20 pvid untagged  | |
+# | |                                                                       | |
+# | |                             + vx4001                                  | |
+# | |                               local 2001:db8:3::1                     | |
+# | |                               remote 2001:db8:3::2                    | |
+# | |                               id 104001                               | |
+# | |                               dstport 4789                            | |
+# | |                               vid 4001 pvid untagged                  | |
+# | |                                                                       | |
+# | +-----------------------------------+-----------------------------------+ |
+# |                                     |                                     |
+# | +-----------------------------------|-----------------------------------+ |
+# | |                                   |                                   | |
+# | |  +--------------------------------+--------------------------------+  | |
+# | |  |                                |                                |  | |
+# | |  + vlan10                         |                         vlan20 +  | |
+# | |  | 2001:db8:1::2/64               |               2001:db8:2::2/64 |  | |
+# | |  |                                |                                |  | |
+# | |  + vlan10-v (macvlan)             +             vlan20-v (macvlan) +  | |
+# | |    2001:db8:1::3/64           vlan4001            2001:db8:2::3/64    | |
+# | |    00:00:5e:00:01:01                             00:00:5e:00:01:01    | |
+# | |                               vrf-green                               | |
+# | +-----------------------------------------------------------------------+ |
+# |                                                                           |
+# |    + $rp1                                       +lo                       |
+# |    | 2001:db8:4::1/64                           2001:db8:3::1             |
+# +----|----------------------------------------------------------------------+
+#      |
+# +----|--------------------------------------------------------+
+# |    |                            vrf-spine                   |
+# |    + $rp2                                                   |
+# |      2001:db8:4::2/64                                       |
+# |                                                             |   (maybe) HW
+# =============================================================================
+# |                                                             |  (likely) SW
+# |                                                             |
+# |    + v1 (veth)                                              |
+# |    | 2001:db8:5::2/64                                       |
+# +----|--------------------------------------------------------+
+#      |
+# +----|----------------------------------------------------------------------+
+# |    + v2 (veth)                                  +lo           NS1 (netns) |
+# |      2001:db8:5::1/64                            2001:db8:3::2/128        |
+# |                                                                           |
+# | +-----------------------------------------------------------------------+ |
+# | |                               vrf-green                               | |
+# | |  + vlan10-v (macvlan)                           vlan20-v (macvlan) +  | |
+# | |  | 2001:db8:1::3/64                               2001:db8:2::3/64 |  | |
+# | |  | 00:00:5e:00:01:01                             00:00:5e:00:01:01 |  | |
+# | |  |                            vlan4001                             |  | |
+# | |  + vlan10                         +                         vlan20 +  | |
+# | |  | 2001:db8:1::3/64               |               2001:db8:2::3/64 |  | |
+# | |  |                                |                                |  | |
+# | |  +--------------------------------+--------------------------------+  | |
+# | |                                   |                                   | |
+# | +-----------------------------------|-----------------------------------+ |
+# |                                     |                                     |
+# | +-----------------------------------+-----------------------------------+ |
+# | |                                                                       | |
+# | |  + vx10                                     + vx20                    | |
+# | |    local 2001:db8:3::2                        local 2001:db8:3::2     | |
+# | |    remote 2001:db8:3::1                       remote 2001:db8:3::1    | |
+# | |    id 1010                                    id 1020                 | |
+# | |    dstport 4789                               dstport 4789            | |
+# | |    vid 10 pvid untagged                       vid 20 pvid untagged    | |
+# | |                                                                       | |
+# | |                             + vx4001                                  | |
+# | |                               local 2001:db8:3::2                     | |
+# | |                               remote 2001:db8:3::1                    | |
+# | |                               id 104001                               | |
+# | |                               dstport 4789                            | |
+# | |                               vid 4001 pvid untagged                  | |
+# | |                                                                       | |
+# | |  + w1 (veth)                                + w3 (veth)               | |
+# | |  | vid 10 pvid untagged          br1        | vid 20 pvid untagged    | |
+# | +--|------------------------------------------|-------------------------+ |
+# |    |                                          |                           |
+# |    |                                          |                           |
+# | +--|----------------------+                +--|-------------------------+ |
+# | |  |               vrf-h1 |                |  |                  vrf-h2 | |
+# | |  + w2 (veth)            |                |  + w4 (veth)               | |
+# | |    2001:db8:1::4/64     |                |    2001:db8:2::4/64        | |
+# | |    default via          |                |    default via             | |
+# | |    2001:db8:1::3/64     |                |    2001:db8:2::3/64        | |
+# | +-------------------------+                +----------------------------+ |
+# +---------------------------------------------------------------------------+
+
+ALL_TESTS="
+	ping_ipv6
+"
+NUM_NETIFS=6
+source lib.sh
+
+hx_create()
+{
+	local vrf_name=$1; shift
+	local if_name=$1; shift
+	local ip_addr=$1; shift
+	local gw_ip=$1; shift
+
+	vrf_create $vrf_name
+	ip link set dev $if_name master $vrf_name
+	ip link set dev $vrf_name up
+	ip link set dev $if_name up
+
+	ip address add $ip_addr/64 dev $if_name
+	ip neigh replace $gw_ip lladdr 00:00:5e:00:01:01 nud permanent \
+		dev $if_name
+	ip route add default vrf $vrf_name nexthop via $gw_ip
+}
+export -f hx_create
+
+hx_destroy()
+{
+	local vrf_name=$1; shift
+	local if_name=$1; shift
+	local ip_addr=$1; shift
+	local gw_ip=$1; shift
+
+	ip route del default vrf $vrf_name nexthop via $gw_ip
+	ip neigh del $gw_ip dev $if_name
+	ip address del $ip_addr/64 dev $if_name
+
+	ip link set dev $if_name down
+	vrf_destroy $vrf_name
+}
+
+h1_create()
+{
+	hx_create "vrf-h1" $h1 2001:db8:1::1 2001:db8:1::3
+}
+
+h1_destroy()
+{
+	hx_destroy "vrf-h1" $h1 2001:db8:1::1 2001:db8:1::3
+}
+
+h2_create()
+{
+	hx_create "vrf-h2" $h2 2001:db8:2::1 2001:db8:2::3
+}
+
+h2_destroy()
+{
+	hx_destroy "vrf-h2" $h2 2001:db8:2::1 2001:db8:2::3
+}
+
+switch_create()
+{
+	ip link add name br1 type bridge vlan_filtering 1 vlan_default_pvid 0 \
+		mcast_snooping 0
+	# Make sure the bridge uses the MAC address of the local port and not
+	# that of the VxLAN's device.
+	ip link set dev br1 address $(mac_get $swp1)
+	ip link set dev br1 up
+
+	ip link set dev $rp1 up
+	ip address add dev $rp1 2001:db8:4::1/64
+	ip route add 2001:db8:3::2/128 nexthop via 2001:db8:4::2
+
+	ip link add name vx10 type vxlan id 1010		\
+		local 2001:db8:3::1 remote 2001:db8:3::2 dstport 4789	\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx10 up
+
+	ip link set dev vx10 master br1
+	bridge vlan add vid 10 dev vx10 pvid untagged
+
+	ip link add name vx20 type vxlan id 1020		\
+		local 2001:db8:3::1 remote 2001:db8:3::2 dstport 4789	\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx20 up
+
+	ip link set dev vx20 master br1
+	bridge vlan add vid 20 dev vx20 pvid untagged
+
+	ip link set dev $swp1 master br1
+	ip link set dev $swp1 up
+
+	ip link set dev $swp2 master br1
+	ip link set dev $swp2 up
+
+	ip link add name vx4001 type vxlan id 104001		\
+		local 2001:db8:3::1 dstport 4789			\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx4001 up
+
+	ip link set dev vx4001 master br1
+	bridge vlan add vid 4001 dev vx4001 pvid untagged
+
+	ip address add 2001:db8:3::1/128 dev lo
+
+	# Create SVIs
+	vrf_create "vrf-green"
+	ip link set dev vrf-green up
+
+	ip link add link br1 name vlan10 up master vrf-green type vlan id 10
+	ip address add 2001:db8:1::2/64 dev vlan10
+	ip link add link vlan10 name vlan10-v up master vrf-green \
+		address 00:00:5e:00:01:01 type macvlan mode private
+	ip address add 2001:db8:1::3/64 dev vlan10-v
+
+	ip link add link br1 name vlan20 up master vrf-green type vlan id 20
+	ip address add 2001:db8:2::2/64 dev vlan20
+	ip link add link vlan20 name vlan20-v up master vrf-green \
+		address 00:00:5e:00:01:01 type macvlan mode private
+	ip address add 2001:db8:2::3/64 dev vlan20-v
+
+	ip link add link br1 name vlan4001 up master vrf-green \
+		type vlan id 4001
+
+	bridge vlan add vid 10 dev br1 self
+	bridge vlan add vid 20 dev br1 self
+	bridge vlan add vid 4001 dev br1 self
+
+	bridge fdb add 00:00:5e:00:01:01 dev br1 self local vlan 10
+	bridge fdb add 00:00:5e:00:01:01 dev br1 self local vlan 20
+
+	bridge vlan add vid 10 dev $swp1 pvid untagged
+	bridge vlan add vid 20 dev $swp2 pvid untagged
+}
+
+switch_destroy()
+{
+	bridge vlan del vid 20 dev br1 self
+	bridge vlan del vid 10 dev br1 self
+
+	bridge fdb del 00:00:5e:00:01:01 dev br1 self local vlan 20
+	bridge fdb del 00:00:5e:00:01:01 dev br1 self local vlan 10
+
+	bridge vlan del vid 4001 dev br1 self
+	ip link del dev vlan4001
+
+	ip link del dev vlan20
+
+	ip link del dev vlan10
+
+	vrf_destroy "vrf-green"
+
+	ip address del 2001:db8:3::1/128 dev lo
+
+	bridge vlan del vid 20 dev $swp2
+	ip link set dev $swp2 down
+	ip link set dev $swp2 nomaster
+
+	bridge vlan del vid 10 dev $swp1
+	ip link set dev $swp1 down
+	ip link set dev $swp1 nomaster
+
+	bridge vlan del vid 4001 dev vx4001
+	ip link set dev vx4001 nomaster
+
+	ip link set dev vx4001 down
+	ip link del dev vx4001
+
+	bridge vlan del vid 20 dev vx20
+	ip link set dev vx20 nomaster
+
+	ip link set dev vx20 down
+	ip link del dev vx20
+
+	bridge vlan del vid 10 dev vx10
+	ip link set dev vx10 nomaster
+
+	ip link set dev vx10 down
+	ip link del dev vx10
+
+	ip route del 2001:db8:3::2 nexthop via 2001:db8:4::2
+	ip address del dev $rp1 2001:db8:4::1/64
+	ip link set dev $rp1 down
+
+	ip link set dev br1 down
+	ip link del dev br1
+}
+
+spine_create()
+{
+	vrf_create "vrf-spine"
+	ip link set dev $rp2 master vrf-spine
+	ip link set dev v1 master vrf-spine
+	ip link set dev vrf-spine up
+	ip link set dev $rp2 up
+	ip link set dev v1 up
+
+	ip address add 2001:db8:4::2/64 dev $rp2
+	ip address add 2001:db8:5::2/64 dev v1
+
+	ip route add 2001:db8:3::1/128 vrf vrf-spine nexthop via \
+		2001:db8:4::1
+	ip route add 2001:db8:3::2/128 vrf vrf-spine nexthop via \
+		2001:db8:5::1
+}
+
+spine_destroy()
+{
+	ip route del 2001:db8:3::2/128 vrf vrf-spine nexthop via \
+		2001:db8:5::1
+	ip route del 2001:db8:3::1/128 vrf vrf-spine nexthop via \
+		2001:db8:4::1
+
+	ip address del 2001:db8:5::2/64 dev v1
+	ip address del 2001:db8:4::2/64 dev $rp2
+
+	ip link set dev v1 down
+	ip link set dev $rp2 down
+	vrf_destroy "vrf-spine"
+}
+
+ns_h1_create()
+{
+	hx_create "vrf-h1" w2 2001:db8:1::4 2001:db8:1::3
+}
+export -f ns_h1_create
+
+ns_h2_create()
+{
+	hx_create "vrf-h2" w4 2001:db8:2::4 2001:db8:2::3
+}
+export -f ns_h2_create
+
+ns_switch_create()
+{
+	ip link add name br1 type bridge vlan_filtering 1 vlan_default_pvid 0 \
+		mcast_snooping 0
+	ip link set dev br1 up
+
+	ip link set dev v2 up
+	ip address add dev v2 2001:db8:5::1/64
+	ip route add 2001:db8:3::1 nexthop via 2001:db8:5::2
+
+	ip link add name vx10 type vxlan id 1010		\
+		local 2001:db8:3::2 remote 2001:db8:3::1 dstport 4789	\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx10 up
+
+	ip link set dev vx10 master br1
+	bridge vlan add vid 10 dev vx10 pvid untagged
+
+	ip link add name vx20 type vxlan id 1020		\
+		local 2001:db8:3::2 remote 2001:db8:3::1 dstport 4789	\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx20 up
+
+	ip link set dev vx20 master br1
+	bridge vlan add vid 20 dev vx20 pvid untagged
+
+	ip link add name vx4001 type vxlan id 104001		\
+		local 2001:db8:3::2 dstport 4789			\
+		nolearning udp6zerocsumrx udp6zerocsumtx tos inherit ttl 100
+	ip link set dev vx4001 up
+
+	ip link set dev vx4001 master br1
+	bridge vlan add vid 4001 dev vx4001 pvid untagged
+
+	ip link set dev w1 master br1
+	ip link set dev w1 up
+	bridge vlan add vid 10 dev w1 pvid untagged
+
+	ip link set dev w3 master br1
+	ip link set dev w3 up
+	bridge vlan add vid 20 dev w3 pvid untagged
+
+	ip address add 2001:db8:3::2/128 dev lo
+
+	# Create SVIs
+	vrf_create "vrf-green"
+	ip link set dev vrf-green up
+
+	ip link add link br1 name vlan10 up master vrf-green type vlan id 10
+	ip address add 2001:db8:1::3/64 dev vlan10
+	ip link add link vlan10 name vlan10-v up master vrf-green \
+		address 00:00:5e:00:01:01 type macvlan mode private
+	ip address add 2001:db8:1::3/64 dev vlan10-v
+
+	ip link add link br1 name vlan20 up master vrf-green type vlan id 20
+	ip address add 2001:db8:2::3/64 dev vlan20
+	ip link add link vlan20 name vlan20-v up master vrf-green \
+		address 00:00:5e:00:01:01 type macvlan mode private
+	ip address add 2001:db8:2::3/64 dev vlan20-v
+
+	ip link add link br1 name vlan4001 up master vrf-green \
+		type vlan id 4001
+
+	bridge vlan add vid 10 dev br1 self
+	bridge vlan add vid 20 dev br1 self
+	bridge vlan add vid 4001 dev br1 self
+
+	bridge fdb add 00:00:5e:00:01:01 dev br1 self local vlan 10
+	bridge fdb add 00:00:5e:00:01:01 dev br1 self local vlan 20
+}
+export -f ns_switch_create
+
+ns_init()
+{
+	ip link add name w1 type veth peer name w2
+	ip link add name w3 type veth peer name w4
+
+	ip link set dev lo up
+
+	ns_h1_create
+	ns_h2_create
+	ns_switch_create
+}
+export -f ns_init
+
+ns1_create()
+{
+	ip netns add ns1
+	ip link set dev v2 netns ns1
+	in_ns ns1 ns_init
+}
+
+ns1_destroy()
+{
+	ip netns exec ns1 ip link set dev v2 netns 1
+	ip netns del ns1
+}
+
+__l2_vni_init()
+{
+	local mac1=$1; shift
+	local mac2=$1; shift
+	local ip1=$1; shift
+	local ip2=$1; shift
+	local dst=$1; shift
+
+	bridge fdb add $mac1 dev vx10 self master extern_learn static \
+		dst $dst vlan 10
+	bridge fdb add $mac2 dev vx20 self master extern_learn static \
+		dst $dst vlan 20
+
+	ip neigh add $ip1 lladdr $mac1 nud noarp dev vlan10 \
+		extern_learn
+	ip neigh add $ip2 lladdr $mac2 nud noarp dev vlan20 \
+		extern_learn
+}
+export -f __l2_vni_init
+
+l2_vni_init()
+{
+	local h1_ns_mac=$(in_ns ns1 mac_get w2)
+	local h2_ns_mac=$(in_ns ns1 mac_get w4)
+	local h1_mac=$(mac_get $h1)
+	local h2_mac=$(mac_get $h2)
+
+	__l2_vni_init $h1_ns_mac $h2_ns_mac 2001:db8:1::4 2001:db8:2::4 \
+	       2001:db8:3::2
+	in_ns ns1 __l2_vni_init $h1_mac $h2_mac 2001:db8:1::1 2001:db8:2::1 \
+	       2001:db8:3::1
+}
+
+__l3_vni_init()
+{
+	local mac=$1; shift
+	local vtep_ip=$1; shift
+	local host1_ip=$1; shift
+	local host2_ip=$1; shift
+
+	bridge fdb add $mac dev vx4001 self master extern_learn static \
+		dst $vtep_ip vlan 4001
+
+	ip neigh add $vtep_ip lladdr $mac nud noarp dev vlan4001 extern_learn
+
+	ip route add $host1_ip/128 vrf vrf-green nexthop via $vtep_ip \
+		dev vlan4001 onlink
+	ip route add $host2_ip/128 vrf vrf-green nexthop via $vtep_ip \
+		dev vlan4001 onlink
+}
+export -f __l3_vni_init
+
+l3_vni_init()
+{
+	local vlan4001_ns_mac=$(in_ns ns1 mac_get vlan4001)
+	local vlan4001_mac=$(mac_get vlan4001)
+
+	__l3_vni_init $vlan4001_ns_mac 2001:db8:3::2 2001:db8:1::4 \
+		2001:db8:2::4
+	in_ns ns1 __l3_vni_init $vlan4001_mac 2001:db8:3::1 2001:db8:1::1 \
+		2001:db8:2::1
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	swp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	rp1=${NETIFS[p5]}
+	rp2=${NETIFS[p6]}
+
+	vrf_prepare
+	forwarding_enable
+
+	h1_create
+	h2_create
+	switch_create
+
+	ip link add name v1 type veth peer name v2
+	spine_create
+	ns1_create
+	in_ns ns1 forwarding_enable
+
+	l2_vni_init
+	l3_vni_init
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	ns1_destroy
+	spine_destroy
+	ip link del dev v1
+
+	switch_destroy
+	h2_destroy
+	h1_destroy
+
+	forwarding_restore
+	vrf_cleanup
+}
+
+ping_ipv6()
+{
+	ping6_test $h1 2001:db8:2::1 ": local->local vid 10->vid 20"
+	ping6_test $h1 2001:db8:1::4 ": local->remote vid 10->vid 10"
+	ping6_test $h2 2001:db8:2::4 ": local->remote vid 20->vid 20"
+	ping6_test $h1 2001:db8:2::4 ": local->remote vid 10->vid 20"
+	ping6_test $h2 2001:db8:1::4 ": local->remote vid 20->vid 10"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS