#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Test traffic distribution when there are multiple routes between an IPv6
# GRE tunnel. The tunnel carries IPv6 traffic between multiple hosts.
# Multiple routes are in the underlay network. With the default multipath
# policy, SW2 will only look at the outer IP addresses, hence only a single
# route would be used.
#
# +-------------------------+
# | H1 |
# | $h1 + |
# | 2001:db8:1::2/64 | |
# +-------------------|-----+
# |
# +-------------------|-------------------------+
# | SW1 | |
# | $ol1 + |
# | 2001:db8:1::1/64 |
# | |
# | + g1 (gre) |
# | loc=2001:db8:40::1 |
# | rem=2001:db8:40::2 --. |
# | tos=inherit | |
# | v |
# | + $ul1 |
# | | 2001:db8:80::1/64 |
# +-------------------------|-------------------+
# |
# +-------------------------|-------------------+
# | SW2 | |
# | $ul21 + |
# | 2001:db8:80::2/64 |
# | | |
# ! ________________|_____ |
# | / \ |
# | | | |
# | + $ul22.111 (vlan) + $ul22.222 (vlan) |
# | | 2001:db8:81::1/64 | 2001:db8:82::1/64 |
# | | | |
# +--|----------------------|-------------------+
# | |
# +--|----------------------|-------------------+
# | | | |
# | + $ul32.111 (vlan) + $ul32.222 (vlan) |
# | | 2001:db8:81::2/64 | 2001:db8:82::2/64 |
# | | | |
# | \______________________/ |
# | | |
# | | |
# | $ul31 + |
# | 2001:db8:83::2/64 | SW3 |
# +-------------------------|-------------------+
# |
# +-------------------------|-------------------+
# | + $ul4 |
# | ^ 2001:db8:83::1/64 |
# | + g2 (gre) | |
# | loc=2001:db8:40::2 | |
# | rem=2001:db8:40::1 --' |
# | tos=inherit |
# | |
# | $ol4 + |
# | 2001:db8:2::1/64 | SW4 |
# +--------------------|------------------------+
# |
# +--------------------|---------+
# | | |
# | $h2 + |
# | 2001:db8:2::2/64 H2 |
# +------------------------------+
ALL_TESTS="
ping_ipv6
multipath_ipv6
"
NUM_NETIFS=10
source lib.sh
h1_create()
{
simple_if_init $h1 2001:db8:1::2/64
ip -6 route add vrf v$h1 2001:db8:2::/64 via 2001:db8:1::1
}
h1_destroy()
{
ip -6 route del vrf v$h1 2001:db8:2::/64 via 2001:db8:1::1
simple_if_fini $h1 2001:db8:1::2/64
}
sw1_create()
{
simple_if_init $ol1 2001:db8:1::1/64
__simple_if_init $ul1 v$ol1 2001:db8:80::1/64
tunnel_create g1 ip6gre 2001:db8:40::1 2001:db8:40::2 tos inherit dev v$ol1
__simple_if_init g1 v$ol1 2001:db8:40::1/128
ip -6 route add vrf v$ol1 2001:db8:40::2/128 via 2001:db8:80::2
ip -6 route add vrf v$ol1 2001:db8:2::/64 dev g1
}
sw1_destroy()
{
ip -6 route del vrf v$ol1 2001:db8:2::/64
ip -6 route del vrf v$ol1 2001:db8:40::2/128
__simple_if_fini g1 2001:db8:40::1/128
tunnel_destroy g1
__simple_if_fini $ul1 2001:db8:80::1/64
simple_if_fini $ol1 2001:db8:1::1/64
}
sw2_create()
{
simple_if_init $ul21 2001:db8:80::2/64
__simple_if_init $ul22 v$ul21
vlan_create $ul22 111 v$ul21 2001:db8:81::1/64
vlan_create $ul22 222 v$ul21 2001:db8:82::1/64
ip -6 route add vrf v$ul21 2001:db8:40::1/128 via 2001:db8:80::1
ip -6 route add vrf v$ul21 2001:db8:40::2/128 \
nexthop via 2001:db8:81::2 \
nexthop via 2001:db8:82::2
}
sw2_destroy()
{
ip -6 route del vrf v$ul21 2001:db8:40::2/128
ip -6 route del vrf v$ul21 2001:db8:40::1/128
vlan_destroy $ul22 222
vlan_destroy $ul22 111
__simple_if_fini $ul22
simple_if_fini $ul21 2001:db8:80::2/64
}
sw3_create()
{
simple_if_init $ul31 2001:db8:83::2/64
__simple_if_init $ul32 v$ul31
vlan_create $ul32 111 v$ul31 2001:db8:81::2/64
vlan_create $ul32 222 v$ul31 2001:db8:82::2/64
ip -6 route add vrf v$ul31 2001:db8:40::2/128 via 2001:db8:83::1
ip -6 route add vrf v$ul31 2001:db8:40::1/128 \
nexthop via 2001:db8:81::1 \
nexthop via 2001:db8:82::1
tc qdisc add dev $ul32 clsact
tc filter add dev $ul32 ingress pref 111 prot 802.1Q \
flower vlan_id 111 action pass
tc filter add dev $ul32 ingress pref 222 prot 802.1Q \
flower vlan_id 222 action pass
}
sw3_destroy()
{
tc qdisc del dev $ul32 clsact
ip -6 route del vrf v$ul31 2001:db8:40::1/128
ip -6 route del vrf v$ul31 2001:db8:40::2/128
vlan_destroy $ul32 222
vlan_destroy $ul32 111
__simple_if_fini $ul32
simple_if_fini $ul31 2001:Db8:83::2/64
}
sw4_create()
{
simple_if_init $ol4 2001:db8:2::1/64
__simple_if_init $ul4 v$ol4 2001:db8:83::1/64
tunnel_create g2 ip6gre 2001:db8:40::2 2001:db8:40::1 tos inherit dev v$ol4
__simple_if_init g2 v$ol4 2001:db8:40::2/128
ip -6 route add vrf v$ol4 2001:db8:40::1/128 via 2001:db8:83::2
ip -6 route add vrf v$ol4 2001:db8:1::/64 dev g2
}
sw4_destroy()
{
ip -6 route del vrf v$ol4 2001:db8:1::/64
ip -6 route del vrf v$ol4 2001:db8:40::1/128
__simple_if_fini g2 2001:db8:40::2/128
tunnel_destroy g2
__simple_if_fini $ul4 2001:db8:83::1/64
simple_if_fini $ol4 2001:db8:2::1/64
}
h2_create()
{
simple_if_init $h2 2001:db8:2::2/64
ip -6 route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
}
h2_destroy()
{
ip -6 route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
simple_if_fini $h2 2001:db8:2::2/64
}
setup_prepare()
{
h1=${NETIFS[p1]}
ol1=${NETIFS[p2]}
ul1=${NETIFS[p3]}
ul21=${NETIFS[p4]}
ul22=${NETIFS[p5]}
ul32=${NETIFS[p6]}
ul31=${NETIFS[p7]}
ul4=${NETIFS[p8]}
ol4=${NETIFS[p9]}
h2=${NETIFS[p10]}
vrf_prepare
h1_create
sw1_create
sw2_create
sw3_create
sw4_create
h2_create
forwarding_enable
}
cleanup()
{
pre_cleanup
forwarding_restore
h2_destroy
sw4_destroy
sw3_destroy
sw2_destroy
sw1_destroy
h1_destroy
vrf_cleanup
}
multipath6_test()
{
local what=$1; shift
local weight1=$1; shift
local weight2=$1; shift
sysctl_set net.ipv6.fib_multipath_hash_policy 2
ip route replace vrf v$ul21 2001:db8:40::2/128 \
nexthop via 2001:db8:81::2 weight $weight1 \
nexthop via 2001:db8:82::2 weight $weight2
local t0_111=$(tc_rule_stats_get $ul32 111 ingress)
local t0_222=$(tc_rule_stats_get $ul32 222 ingress)
ip vrf exec v$h1 \
$MZ $h1 -6 -q -p 64 -A "2001:db8:1::2-2001:db8:1::3e" \
-B "2001:db8:2::2-2001:db8:2::3e" \
-d $MZ_DELAY -c 50 -t udp "sp=1024,dp=1024"
sleep 1
local t1_111=$(tc_rule_stats_get $ul32 111 ingress)
local t1_222=$(tc_rule_stats_get $ul32 222 ingress)
local d111=$((t1_111 - t0_111))
local d222=$((t1_222 - t0_222))
multipath_eval "$what" $weight1 $weight2 $d111 $d222
ip route replace vrf v$ul21 2001:db8:40::2/128 \
nexthop via 2001:db8:81::2 \
nexthop via 2001:db8:82::2
sysctl_restore net.ipv6.fib_multipath_hash_policy
}
ping_ipv6()
{
ping_test $h1 2001:db8:2::2
}
multipath_ipv6()
{
log_info "Running IPv6 over GRE over IPv6 multipath tests"
multipath6_test "ECMP" 1 1
multipath6_test "Weighted MP 2:1" 2 1
multipath6_test "Weighted MP 11:45" 11 45
}
trap cleanup EXIT
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS
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