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diff --git a/tools/testing/selftests/net/forwarding/ip6gre_lib.sh b/tools/testing/selftests/net/forwarding/ip6gre_lib.sh
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+# SPDX-License-Identifier: GPL-2.0
+#!/bin/bash
+
+# Handles creation and destruction of IP-in-IP or GRE tunnels over the given
+# topology. Supports both flat and hierarchical models.
+#
+# Flat Model:
+# Overlay and underlay share the same VRF.
+# SW1 uses default VRF so tunnel has no bound dev.
+# SW2 uses non-default VRF tunnel has a bound dev.
+# +--------------------------------+
+# | H1 |
+# | $h1 + |
+# | 198.51.100.1/24 | |
+# | 2001:db8:1::1/64 | |
+# +-------------------------|------+
+# |
+# +-------------------------|-------------------+
+# | SW1 | |
+# | $ol1 + |
+# | 198.51.100.2/24 |
+# | 2001:db8:1::2/64 |
+# | |
+# | + g1a (ip6gre) |
+# | loc=2001:db8:3::1 |
+# | rem=2001:db8:3::2 --. |
+# | tos=inherit | |
+# | . |
+# | .--------------------- |
+# | | |
+# | v |
+# | + $ul1.111 (vlan) |
+# | | 2001:db8:10::1/64 |
+# | \ |
+# | \____________ |
+# | | |
+# | VRF default + $ul1 |
+# +---------------------|-----------------------+
+# |
+# +---------------------|-----------------------+
+# | SW2 | |
+# | $ul2 + |
+# | ___________| |
+# | / |
+# | / |
+# | + $ul2.111 (vlan) |
+# | ^ 2001:db8:10::2/64 |
+# | | |
+# | | |
+# | '----------------------. |
+# | + g2a (ip6gre) | |
+# | loc=2001:db8:3::2 | |
+# | rem=2001:db8:3::1 --' |
+# | tos=inherit |
+# | |
+# | + $ol2 |
+# | | 203.0.113.2/24 |
+# | VRF v$ol2 | 2001:db8:2::2/64 |
+# +---------------------|-----------------------+
+# +---------------------|----------+
+# | H2 | |
+# | $h2 + |
+# | 203.0.113.1/24 |
+# | 2001:db8:2::1/64 |
+# +--------------------------------+
+#
+# Hierarchical model:
+# The tunnel is bound to a device in a different VRF
+#
+# +--------------------------------+
+# | H1 |
+# | $h1 + |
+# | 198.51.100.1/24 | |
+# | 2001:db8:1::1/64 | |
+# +-------------------------|------+
+# |
+# +-------------------------|-------------------+
+# | SW1 | |
+# | +-----------------------|-----------------+ |
+# | | $ol1 + | |
+# | | 198.51.100.2/24 | |
+# | | 2001:db8:1::2/64 | |
+# | | | |
+# | | + g1a (ip6gre) | |
+# | | loc=2001:db8:3::1 | |
+# | | rem=2001:db8:3::2 | |
+# | | tos=inherit | |
+# | | ^ | |
+# | | VRF v$ol1 | | |
+# | +--------------------|--------------------+ |
+# | | |
+# | +--------------------|--------------------+ |
+# | | VRF v$ul1 | | |
+# | | | | |
+# | | v | |
+# | | dummy1 + | |
+# | | 2001:db8:3::1/64 | |
+# | | .-----------' | |
+# | | | | |
+# | | v | |
+# | | + $ul1.111 (vlan) | |
+# | | | 2001:db8:10::1/64 | |
+# | | \ | |
+# | | \__________ | |
+# | | | | |
+# | | + $ul1 | |
+# | +---------------------|-------------------+ |
+# +-----------------------|---------------------+
+# |
+# +-----------------------|---------------------+
+# | SW2 | |
+# | +---------------------|-------------------+ |
+# | | + $ul2 | |
+# | | _____| | |
+# | | / | |
+# | | / | |
+# | | | $ul2.111 (vlan) | |
+# | | + 2001:db8:10::2/64 | |
+# | | ^ | |
+# | | | | |
+# | | '------. | |
+# | | dummy2 + | |
+# | | 2001:db8:3::2/64 | |
+# | | ^ | |
+# | | | | |
+# | | | | |
+# | | VRF v$ul2 | | |
+# | +---------------------|-------------------+ |
+# | | |
+# | +---------------------|-------------------+ |
+# | | VRF v$ol2 | | |
+# | | | | |
+# | | v | |
+# | | g2a (ip6gre) + | |
+# | | loc=2001:db8:3::2 | |
+# | | rem=2001:db8:3::1 | |
+# | | tos=inherit | |
+# | | | |
+# | | $ol2 + | |
+# | | 203.0.113.2/24 | | |
+# | | 2001:db8:2::2/64 | | |
+# | +---------------------|-------------------+ |
+# +-----------------------|---------------------+
+# |
+# +-----------------------|--------+
+# | H2 | |
+# | $h2 + |
+# | 203.0.113.1/24 |
+# | 2001:db8:2::1/64 |
+# +--------------------------------+
+
+source lib.sh
+source tc_common.sh
+
+h1_create()
+{
+ simple_if_init $h1 198.51.100.1/24 2001:db8:1::1/64
+ ip route add vrf v$h1 203.0.113.0/24 via 198.51.100.2
+ ip -6 route add vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
+}
+
+h1_destroy()
+{
+ ip -6 route del vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
+ ip route del vrf v$h1 203.0.113.0/24 via 198.51.100.2
+ simple_if_fini $h1 198.51.100.1/24 2001:db8:1::1/64
+}
+
+h2_create()
+{
+ simple_if_init $h2 203.0.113.1/24 2001:db8:2::1/64
+ ip route add vrf v$h2 198.51.100.0/24 via 203.0.113.2
+ ip -6 route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::2
+}
+
+h2_destroy()
+{
+ ip -6 route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::2
+ ip route del vrf v$h2 198.51.100.0/24 via 203.0.113.2
+ simple_if_fini $h2 203.0.113.1/24 2001:db8:2::1/64
+}
+
+sw1_flat_create()
+{
+ local ol1=$1; shift
+ local ul1=$1; shift
+
+ ip link set dev $ol1 up
+ __addr_add_del $ol1 add 198.51.100.2/24 2001:db8:1::2/64
+
+ ip link set dev $ul1 up
+ vlan_create $ul1 111 "" 2001:db8:10::1/64
+
+ tunnel_create g1a ip6gre 2001:db8:3::1 2001:db8:3::2 tos inherit \
+ ttl inherit "$@"
+ ip link set dev g1a up
+ __addr_add_del g1a add "2001:db8:3::1/128"
+
+ ip -6 route add 2001:db8:3::2/128 via 2001:db8:10::2
+ ip route add 203.0.113.0/24 dev g1a
+ ip -6 route add 2001:db8:2::/64 dev g1a
+}
+
+sw1_flat_destroy()
+{
+ local ol1=$1; shift
+ local ul1=$1; shift
+
+ ip -6 route del 2001:db8:2::/64
+ ip route del 203.0.113.0/24
+ ip -6 route del 2001:db8:3::2/128 via 2001:db8:10::2
+
+ __simple_if_fini g1a 2001:db8:3::1/128
+ tunnel_destroy g1a
+
+ vlan_destroy $ul1 111
+ __simple_if_fini $ul1
+ __simple_if_fini $ol1 198.51.100.2/24 2001:db8:1::2/64
+}
+
+sw2_flat_create()
+{
+ local ol2=$1; shift
+ local ul2=$1; shift
+
+ simple_if_init $ol2 203.0.113.2/24 2001:db8:2::2/64
+ __simple_if_init $ul2 v$ol2
+ vlan_create $ul2 111 v$ol2 2001:db8:10::2/64
+
+ tunnel_create g2a ip6gre 2001:db8:3::2 2001:db8:3::1 tos inherit \
+ ttl inherit dev v$ol2 "$@"
+ __simple_if_init g2a v$ol2 2001:db8:3::2/128
+
+ # Replace neighbor to avoid 1 dropped packet due to "unresolved neigh"
+ ip neigh replace dev $ol2 203.0.113.1 lladdr $(mac_get $h2)
+ ip -6 neigh replace dev $ol2 2001:db8:2::1 lladdr $(mac_get $h2)
+
+ ip -6 route add vrf v$ol2 2001:db8:3::1/128 via 2001:db8:10::1
+ ip route add vrf v$ol2 198.51.100.0/24 dev g2a
+ ip -6 route add vrf v$ol2 2001:db8:1::/64 dev g2a
+}
+
+sw2_flat_destroy()
+{
+ local ol2=$1; shift
+ local ul2=$1; shift
+
+ ip -6 route del vrf v$ol2 2001:db8:2::/64
+ ip route del vrf v$ol2 198.51.100.0/24
+ ip -6 route del vrf v$ol2 2001:db8:3::1/128 via 2001:db8:10::1
+
+ __simple_if_fini g2a 2001:db8:3::2/128
+ tunnel_destroy g2a
+
+ vlan_destroy $ul2 111
+ __simple_if_fini $ul2
+ simple_if_fini $ol2 203.0.113.2/24 2001:db8:2::2/64
+}
+
+sw1_hierarchical_create()
+{
+ local ol1=$1; shift
+ local ul1=$1; shift
+
+ simple_if_init $ol1 198.51.100.2/24 2001:db8:1::2/64
+ simple_if_init $ul1
+ ip link add name dummy1 type dummy
+ __simple_if_init dummy1 v$ul1 2001:db8:3::1/64
+
+ vlan_create $ul1 111 v$ul1 2001:db8:10::1/64
+ tunnel_create g1a ip6gre 2001:db8:3::1 2001:db8:3::2 tos inherit \
+ ttl inherit dev dummy1 "$@"
+ ip link set dev g1a master v$ol1
+
+ ip -6 route add vrf v$ul1 2001:db8:3::2/128 via 2001:db8:10::2
+ ip route add vrf v$ol1 203.0.113.0/24 dev g1a
+ ip -6 route add vrf v$ol1 2001:db8:2::/64 dev g1a
+}
+
+sw1_hierarchical_destroy()
+{
+ local ol1=$1; shift
+ local ul1=$1; shift
+
+ ip -6 route del vrf v$ol1 2001:db8:2::/64
+ ip route del vrf v$ol1 203.0.113.0/24
+ ip -6 route del vrf v$ul1 2001:db8:3::2/128
+
+ tunnel_destroy g1a
+ vlan_destroy $ul1 111
+
+ __simple_if_fini dummy1 2001:db8:3::1/64
+ ip link del dev dummy1
+
+ simple_if_fini $ul1
+ simple_if_fini $ol1 198.51.100.2/24 2001:db8:1::2/64
+}
+
+sw2_hierarchical_create()
+{
+ local ol2=$1; shift
+ local ul2=$1; shift
+
+ simple_if_init $ol2 203.0.113.2/24 2001:db8:2::2/64
+ simple_if_init $ul2
+
+ ip link add name dummy2 type dummy
+ __simple_if_init dummy2 v$ul2 2001:db8:3::2/64
+
+ vlan_create $ul2 111 v$ul2 2001:db8:10::2/64
+ tunnel_create g2a ip6gre 2001:db8:3::2 2001:db8:3::1 tos inherit \
+ ttl inherit dev dummy2 "$@"
+ ip link set dev g2a master v$ol2
+
+ # Replace neighbor to avoid 1 dropped packet due to "unresolved neigh"
+ ip neigh replace dev $ol2 203.0.113.1 lladdr $(mac_get $h2)
+ ip -6 neigh replace dev $ol2 2001:db8:2::1 lladdr $(mac_get $h2)
+
+ ip -6 route add vrf v$ul2 2001:db8:3::1/128 via 2001:db8:10::1
+ ip route add vrf v$ol2 198.51.100.0/24 dev g2a
+ ip -6 route add vrf v$ol2 2001:db8:1::/64 dev g2a
+}
+
+sw2_hierarchical_destroy()
+{
+ local ol2=$1; shift
+ local ul2=$1; shift
+
+ ip -6 route del vrf v$ol2 2001:db8:2::/64
+ ip route del vrf v$ol2 198.51.100.0/24
+ ip -6 route del vrf v$ul2 2001:db8:3::1/128
+
+ tunnel_destroy g2a
+ vlan_destroy $ul2 111
+
+ __simple_if_fini dummy2 2001:db8:3::2/64
+ ip link del dev dummy2
+
+ simple_if_fini $ul2
+ simple_if_fini $ol2 203.0.113.2/24 2001:db8:2::2/64
+}
+
+test_traffic_ip4ip6()
+{
+ RET=0
+
+ h1mac=$(mac_get $h1)
+ ol1mac=$(mac_get $ol1)
+
+ tc qdisc add dev $ul1 clsact
+ tc filter add dev $ul1 egress proto all pref 1 handle 101 \
+ flower $TC_FLAG action pass
+
+ tc qdisc add dev $ol2 clsact
+ tc filter add dev $ol2 egress protocol ipv4 pref 1 handle 101 \
+ flower $TC_FLAG dst_ip 203.0.113.1 action pass
+
+ $MZ $h1 -c 1000 -p 64 -a $h1mac -b $ol1mac -A 198.51.100.1 \
+ -B 203.0.113.1 -t ip -q -d 1msec
+
+ # Check ports after encap and after decap.
+ tc_check_at_least_x_packets "dev $ul1 egress" 101 1000
+ check_err $? "Packets did not go through $ul1, tc_flag = $TC_FLAG"
+
+ tc_check_at_least_x_packets "dev $ol2 egress" 101 1000
+ check_err $? "Packets did not go through $ol2, tc_flag = $TC_FLAG"
+
+ log_test "$@"
+
+ tc filter del dev $ol2 egress protocol ipv4 pref 1 handle 101 flower
+ tc qdisc del dev $ol2 clsact
+ tc filter del dev $ul1 egress proto all pref 1 handle 101 flower
+ tc qdisc del dev $ul1 clsact
+}
+
+test_traffic_ip6ip6()
+{
+ RET=0
+
+ h1mac=$(mac_get $h1)
+ ol1mac=$(mac_get $ol1)
+
+ tc qdisc add dev $ul1 clsact
+ tc filter add dev $ul1 egress proto all pref 1 handle 101 \
+ flower $TC_FLAG action pass
+
+ tc qdisc add dev $ol2 clsact
+ tc filter add dev $ol2 egress protocol ipv6 pref 1 handle 101 \
+ flower $TC_FLAG dst_ip 2001:db8:2::1 action pass
+
+ $MZ -6 $h1 -c 1000 -p 64 -a $h1mac -b $ol1mac -A 2001:db8:1::1 \
+ -B 2001:db8:2::1 -t ip -q -d 1msec
+
+ # Check ports after encap and after decap.
+ tc_check_at_least_x_packets "dev $ul1 egress" 101 1000
+ check_err $? "Packets did not go through $ul1, tc_flag = $TC_FLAG"
+
+ tc_check_at_least_x_packets "dev $ol2 egress" 101 1000
+ check_err $? "Packets did not go through $ol2, tc_flag = $TC_FLAG"
+
+ log_test "$@"
+
+ tc filter del dev $ol2 egress protocol ipv6 pref 1 handle 101 flower
+ tc qdisc del dev $ol2 clsact
+ tc filter del dev $ul1 egress proto all pref 1 handle 101 flower
+ tc qdisc del dev $ul1 clsact
+}
+
+topo_mtu_change()
+{
+ local mtu=$1
+
+ ip link set mtu $mtu dev $h1
+ ip link set mtu $mtu dev $ol1
+ ip link set mtu $mtu dev g1a
+ ip link set mtu $mtu dev $ul1
+ ip link set mtu $mtu dev $ul1.111
+ ip link set mtu $mtu dev $h2
+ ip link set mtu $mtu dev $ol2
+ ip link set mtu $mtu dev g2a
+ ip link set mtu $mtu dev $ul2
+ ip link set mtu $mtu dev $ul2.111
+}
+
+test_mtu_change()
+{
+ RET=0
+
+ ping6_do $h1 2001:db8:2::1 "-s 1800 -w 3"
+ check_fail $? "ping GRE IPv6 should not pass with packet size 1800"
+
+ RET=0
+
+ topo_mtu_change 2000
+ ping6_do $h1 2001:db8:2::1 "-s 1800 -w 3"
+ check_err $?
+ log_test "ping GRE IPv6, packet size 1800 after MTU change"
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.