#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Test traffic distribution between two paths when using custom hash policy.
#
# +--------------------------------+
# | H1 |
# | $h1 + |
# | 198.51.100.{2-253}/24 | |
# | 2001:db8:1::{2-fd}/64 | |
# +-------------------------|------+
# |
# +-------------------------|-------------------------+
# | SW1 | |
# | $rp1 + |
# | 198.51.100.1/24 |
# | 2001:db8:1::1/64 |
# | |
# | |
# | $rp11 + + $rp12 |
# | 192.0.2.1/28 | | 192.0.2.17/28 |
# | 2001:db8:2::1/64 | | 2001:db8:3::1/64 |
# +------------------|-------------|------------------+
# | |
# +------------------|-------------|------------------+
# | SW2 | | |
# | | | |
# | $rp21 + + $rp22 |
# | 192.0.2.2/28 192.0.2.18/28 |
# | 2001:db8:2::2/64 2001:db8:3::2/64 |
# | |
# | |
# | $rp2 + |
# | 203.0.113.1/24 | |
# | 2001:db8:4::1/64 | |
# +-------------------------|-------------------------+
# |
# +-------------------------|------+
# | H2 | |
# | $h2 + |
# | 203.0.113.{2-253}/24 |
# | 2001:db8:4::{2-fd}/64 |
# +--------------------------------+
ALL_TESTS="
ping_ipv4
ping_ipv6
custom_hash
"
NUM_NETIFS=8
source lib.sh
h1_create()
{
simple_if_init $h1 198.51.100.2/24 2001:db8:1::2/64
ip route add vrf v$h1 default via 198.51.100.1 dev $h1
ip -6 route add vrf v$h1 default via 2001:db8:1::1 dev $h1
}
h1_destroy()
{
ip -6 route del vrf v$h1 default
ip route del vrf v$h1 default
simple_if_fini $h1 198.51.100.2/24 2001:db8:1::2/64
}
sw1_create()
{
simple_if_init $rp1 198.51.100.1/24 2001:db8:1::1/64
__simple_if_init $rp11 v$rp1 192.0.2.1/28 2001:db8:2::1/64
__simple_if_init $rp12 v$rp1 192.0.2.17/28 2001:db8:3::1/64
ip route add vrf v$rp1 203.0.113.0/24 \
nexthop via 192.0.2.2 dev $rp11 \
nexthop via 192.0.2.18 dev $rp12
ip -6 route add vrf v$rp1 2001:db8:4::/64 \
nexthop via 2001:db8:2::2 dev $rp11 \
nexthop via 2001:db8:3::2 dev $rp12
}
sw1_destroy()
{
ip -6 route del vrf v$rp1 2001:db8:4::/64
ip route del vrf v$rp1 203.0.113.0/24
__simple_if_fini $rp12 192.0.2.17/28 2001:db8:3::1/64
__simple_if_fini $rp11 192.0.2.1/28 2001:db8:2::1/64
simple_if_fini $rp1 198.51.100.1/24 2001:db8:1::1/64
}
sw2_create()
{
simple_if_init $rp2 203.0.113.1/24 2001:db8:4::1/64
__simple_if_init $rp21 v$rp2 192.0.2.2/28 2001:db8:2::2/64
__simple_if_init $rp22 v$rp2 192.0.2.18/28 2001:db8:3::2/64
ip route add vrf v$rp2 198.51.100.0/24 \
nexthop via 192.0.2.1 dev $rp21 \
nexthop via 192.0.2.17 dev $rp22
ip -6 route add vrf v$rp2 2001:db8:1::/64 \
nexthop via 2001:db8:2::1 dev $rp21 \
nexthop via 2001:db8:3::1 dev $rp22
}
sw2_destroy()
{
ip -6 route del vrf v$rp2 2001:db8:1::/64
ip route del vrf v$rp2 198.51.100.0/24
__simple_if_fini $rp22 192.0.2.18/28 2001:db8:3::2/64
__simple_if_fini $rp21 192.0.2.2/28 2001:db8:2::2/64
simple_if_fini $rp2 203.0.113.1/24 2001:db8:4::1/64
}
h2_create()
{
simple_if_init $h2 203.0.113.2/24 2001:db8:4::2/64
ip route add vrf v$h2 default via 203.0.113.1 dev $h2
ip -6 route add vrf v$h2 default via 2001:db8:4::1 dev $h2
}
h2_destroy()
{
ip -6 route del vrf v$h2 default
ip route del vrf v$h2 default
simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64
}
setup_prepare()
{
h1=${NETIFS[p1]}
rp1=${NETIFS[p2]}
rp11=${NETIFS[p3]}
rp21=${NETIFS[p4]}
rp12=${NETIFS[p5]}
rp22=${NETIFS[p6]}
rp2=${NETIFS[p7]}
h2=${NETIFS[p8]}
vrf_prepare
h1_create
sw1_create
sw2_create
h2_create
forwarding_enable
}
cleanup()
{
pre_cleanup
forwarding_restore
h2_destroy
sw2_destroy
sw1_destroy
h1_destroy
vrf_cleanup
}
ping_ipv4()
{
ping_test $h1 203.0.113.2
}
ping_ipv6()
{
ping6_test $h1 2001:db8:4::2
}
send_src_ipv4()
{
ip vrf exec v$h1 $MZ $h1 -q -p 64 \
-A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
-d 1msec -c 50 -t udp "sp=20000,dp=30000"
}
send_dst_ipv4()
{
ip vrf exec v$h1 $MZ $h1 -q -p 64 \
-A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
-d 1msec -c 50 -t udp "sp=20000,dp=30000"
}
send_src_udp4()
{
ip vrf exec v$h1 $MZ $h1 -q -p 64 \
-A 198.51.100.2 -B 203.0.113.2 \
-d 1msec -t udp "sp=0-32768,dp=30000"
}
send_dst_udp4()
{
ip vrf exec v$h1 $MZ $h1 -q -p 64 \
-A 198.51.100.2 -B 203.0.113.2 \
-d 1msec -t udp "sp=20000,dp=0-32768"
}
send_src_ipv6()
{
ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
-A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
-d 1msec -c 50 -t udp "sp=20000,dp=30000"
}
send_dst_ipv6()
{
ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
-A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
-d 1msec -c 50 -t udp "sp=20000,dp=30000"
}
send_flowlabel()
{
# Generate 16384 echo requests, each with a random flow label.
for _ in $(seq 1 16384); do
ip vrf exec v$h1 \
$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
done
}
send_src_udp6()
{
ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
-A 2001:db8:1::2 -B 2001:db8:4::2 \
-d 1msec -t udp "sp=0-32768,dp=30000"
}
send_dst_udp6()
{
ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
-A 2001:db8:1::2 -B 2001:db8:4::2 \
-d 1msec -t udp "sp=20000,dp=0-32768"
}
custom_hash_test()
{
local field="$1"; shift
local balanced="$1"; shift
local send_flows="$@"
RET=0
local t0_rp11=$(link_stats_tx_packets_get $rp11)
local t0_rp12=$(link_stats_tx_packets_get $rp12)
$send_flows
local t1_rp11=$(link_stats_tx_packets_get $rp11)
local t1_rp12=$(link_stats_tx_packets_get $rp12)
local d_rp11=$((t1_rp11 - t0_rp11))
local d_rp12=$((t1_rp12 - t0_rp12))
local diff=$((d_rp12 - d_rp11))
local sum=$((d_rp11 + d_rp12))
local pct=$(echo "$diff / $sum * 100" | bc -l)
local is_balanced=$(echo "-20 <= $pct && $pct <= 20" | bc)
[[ ( $is_balanced -eq 1 && $balanced == "balanced" ) ||
( $is_balanced -eq 0 && $balanced == "unbalanced" ) ]]
check_err $? "Expected traffic to be $balanced, but it is not"
log_test "Multipath hash field: $field ($balanced)"
log_info "Packets sent on path1 / path2: $d_rp11 / $d_rp12"
}
custom_hash_v4()
{
log_info "Running IPv4 custom multipath hash tests"
sysctl_set net.ipv4.fib_multipath_hash_policy 3
# Prevent the neighbour table from overflowing, as different neighbour
# entries will be created on $ol4 when using different destination IPs.
sysctl_set net.ipv4.neigh.default.gc_thresh1 1024
sysctl_set net.ipv4.neigh.default.gc_thresh2 1024
sysctl_set net.ipv4.neigh.default.gc_thresh3 1024
sysctl_set net.ipv4.fib_multipath_hash_fields 0x0001
custom_hash_test "Source IP" "balanced" send_src_ipv4
custom_hash_test "Source IP" "unbalanced" send_dst_ipv4
sysctl_set net.ipv4.fib_multipath_hash_fields 0x0002
custom_hash_test "Destination IP" "balanced" send_dst_ipv4
custom_hash_test "Destination IP" "unbalanced" send_src_ipv4
sysctl_set net.ipv4.fib_multipath_hash_fields 0x0010
custom_hash_test "Source port" "balanced" send_src_udp4
custom_hash_test "Source port" "unbalanced" send_dst_udp4
sysctl_set net.ipv4.fib_multipath_hash_fields 0x0020
custom_hash_test "Destination port" "balanced" send_dst_udp4
custom_hash_test "Destination port" "unbalanced" send_src_udp4
sysctl_restore net.ipv4.neigh.default.gc_thresh3
sysctl_restore net.ipv4.neigh.default.gc_thresh2
sysctl_restore net.ipv4.neigh.default.gc_thresh1
sysctl_restore net.ipv4.fib_multipath_hash_policy
}
custom_hash_v6()
{
log_info "Running IPv6 custom multipath hash tests"
sysctl_set net.ipv6.fib_multipath_hash_policy 3
# Prevent the neighbour table from overflowing, as different neighbour
# entries will be created on $ol4 when using different destination IPs.
sysctl_set net.ipv6.neigh.default.gc_thresh1 1024
sysctl_set net.ipv6.neigh.default.gc_thresh2 1024
sysctl_set net.ipv6.neigh.default.gc_thresh3 1024
sysctl_set net.ipv6.fib_multipath_hash_fields 0x0001
custom_hash_test "Source IP" "balanced" send_src_ipv6
custom_hash_test "Source IP" "unbalanced" send_dst_ipv6
sysctl_set net.ipv6.fib_multipath_hash_fields 0x0002
custom_hash_test "Destination IP" "balanced" send_dst_ipv6
custom_hash_test "Destination IP" "unbalanced" send_src_ipv6
sysctl_set net.ipv6.fib_multipath_hash_fields 0x0008
custom_hash_test "Flowlabel" "balanced" send_flowlabel
custom_hash_test "Flowlabel" "unbalanced" send_src_ipv6
sysctl_set net.ipv6.fib_multipath_hash_fields 0x0010
custom_hash_test "Source port" "balanced" send_src_udp6
custom_hash_test "Source port" "unbalanced" send_dst_udp6
sysctl_set net.ipv6.fib_multipath_hash_fields 0x0020
custom_hash_test "Destination port" "balanced" send_dst_udp6
custom_hash_test "Destination port" "unbalanced" send_src_udp6
sysctl_restore net.ipv6.neigh.default.gc_thresh3
sysctl_restore net.ipv6.neigh.default.gc_thresh2
sysctl_restore net.ipv6.neigh.default.gc_thresh1
sysctl_restore net.ipv6.fib_multipath_hash_policy
}
custom_hash()
{
# Test that when the hash policy is set to custom, traffic is
# distributed only according to the fields set in the
# fib_multipath_hash_fields sysctl.
#
# Each time set a different field and make sure traffic is only
# distributed when the field is changed in the packet stream.
custom_hash_v4
custom_hash_v6
}
trap cleanup EXIT
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS