selftests: Add version of router_multipath.sh using nexthop objects

Add a version of router_multipath.sh that uses nexthop objects for
routes.

Ido requested a version that does not cause regressions with mlxsw
testing since it does not support nexthop objects yet.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/forwarding/router_mpath_nh.sh b/tools/testing/selftests/net/forwarding/router_mpath_nh.sh
new file mode 100755 (executable)
index 0000000..cf3d26c
--- /dev/null
+++ b/tools/testing/selftests/net/forwarding/router_mpath_nh.sh
@@ -0,0 +1,359 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ALL_TESTS="ping_ipv4 ping_ipv6 multipath_test"
+NUM_NETIFS=8
+source lib.sh
+
+h1_create()
+{
+       vrf_create "vrf-h1"
+       ip link set dev $h1 master vrf-h1
+
+       ip link set dev vrf-h1 up
+       ip link set dev $h1 up
+
+       ip address add 192.0.2.2/24 dev $h1
+       ip address add 2001:db8:1::2/64 dev $h1
+
+       ip route add 198.51.100.0/24 vrf vrf-h1 nexthop via 192.0.2.1
+       ip route add 2001:db8:2::/64 vrf vrf-h1 nexthop via 2001:db8:1::1
+}
+
+h1_destroy()
+{
+       ip route del 2001:db8:2::/64 vrf vrf-h1
+       ip route del 198.51.100.0/24 vrf vrf-h1
+
+       ip address del 2001:db8:1::2/64 dev $h1
+       ip address del 192.0.2.2/24 dev $h1
+
+       ip link set dev $h1 down
+       vrf_destroy "vrf-h1"
+}
+
+h2_create()
+{
+       vrf_create "vrf-h2"
+       ip link set dev $h2 master vrf-h2
+
+       ip link set dev vrf-h2 up
+       ip link set dev $h2 up
+
+       ip address add 198.51.100.2/24 dev $h2
+       ip address add 2001:db8:2::2/64 dev $h2
+
+       ip route add 192.0.2.0/24 vrf vrf-h2 nexthop via 198.51.100.1
+       ip route add 2001:db8:1::/64 vrf vrf-h2 nexthop via 2001:db8:2::1
+}
+
+h2_destroy()
+{
+       ip route del 2001:db8:1::/64 vrf vrf-h2
+       ip route del 192.0.2.0/24 vrf vrf-h2
+
+       ip address del 2001:db8:2::2/64 dev $h2
+       ip address del 198.51.100.2/24 dev $h2
+
+       ip link set dev $h2 down
+       vrf_destroy "vrf-h2"
+}
+
+router1_create()
+{
+       vrf_create "vrf-r1"
+       ip link set dev $rp11 master vrf-r1
+       ip link set dev $rp12 master vrf-r1
+       ip link set dev $rp13 master vrf-r1
+
+       ip link set dev vrf-r1 up
+       ip link set dev $rp11 up
+       ip link set dev $rp12 up
+       ip link set dev $rp13 up
+
+       ip address add 192.0.2.1/24 dev $rp11
+       ip address add 2001:db8:1::1/64 dev $rp11
+
+       ip address add 169.254.2.12/24 dev $rp12
+       ip address add fe80:2::12/64 dev $rp12
+
+       ip address add 169.254.3.13/24 dev $rp13
+       ip address add fe80:3::13/64 dev $rp13
+}
+
+router1_destroy()
+{
+       ip route del 2001:db8:2::/64 vrf vrf-r1
+       ip route del 198.51.100.0/24 vrf vrf-r1
+
+       ip address del fe80:3::13/64 dev $rp13
+       ip address del 169.254.3.13/24 dev $rp13
+
+       ip address del fe80:2::12/64 dev $rp12
+       ip address del 169.254.2.12/24 dev $rp12
+
+       ip address del 2001:db8:1::1/64 dev $rp11
+       ip address del 192.0.2.1/24 dev $rp11
+
+       ip nexthop del id 103
+       ip nexthop del id 101
+       ip nexthop del id 102
+       ip nexthop del id 106
+       ip nexthop del id 104
+       ip nexthop del id 105
+
+       ip link set dev $rp13 down
+       ip link set dev $rp12 down
+       ip link set dev $rp11 down
+
+       vrf_destroy "vrf-r1"
+}
+
+router2_create()
+{
+       vrf_create "vrf-r2"
+       ip link set dev $rp21 master vrf-r2
+       ip link set dev $rp22 master vrf-r2
+       ip link set dev $rp23 master vrf-r2
+
+       ip link set dev vrf-r2 up
+       ip link set dev $rp21 up
+       ip link set dev $rp22 up
+       ip link set dev $rp23 up
+
+       ip address add 198.51.100.1/24 dev $rp21
+       ip address add 2001:db8:2::1/64 dev $rp21
+
+       ip address add 169.254.2.22/24 dev $rp22
+       ip address add fe80:2::22/64 dev $rp22
+
+       ip address add 169.254.3.23/24 dev $rp23
+       ip address add fe80:3::23/64 dev $rp23
+}
+
+router2_destroy()
+{
+       ip route del 2001:db8:1::/64 vrf vrf-r2
+       ip route del 192.0.2.0/24 vrf vrf-r2
+
+       ip address del fe80:3::23/64 dev $rp23
+       ip address del 169.254.3.23/24 dev $rp23
+
+       ip address del fe80:2::22/64 dev $rp22
+       ip address del 169.254.2.22/24 dev $rp22
+
+       ip address del 2001:db8:2::1/64 dev $rp21
+       ip address del 198.51.100.1/24 dev $rp21
+
+       ip nexthop del id 201
+       ip nexthop del id 202
+       ip nexthop del id 204
+       ip nexthop del id 205
+
+       ip link set dev $rp23 down
+       ip link set dev $rp22 down
+       ip link set dev $rp21 down
+
+       vrf_destroy "vrf-r2"
+}
+
+routing_nh_obj()
+{
+       ip nexthop add id 101 via 169.254.2.22 dev $rp12
+       ip nexthop add id 102 via 169.254.3.23 dev $rp13
+       ip nexthop add id 103 group 101/102
+       ip route add 198.51.100.0/24 vrf vrf-r1 nhid 103
+
+       ip nexthop add id 104 via fe80:2::22 dev $rp12
+       ip nexthop add id 105 via fe80:3::23 dev $rp13
+       ip nexthop add id 106 group 104/105
+       ip route add 2001:db8:2::/64 vrf vrf-r1 nhid 106
+
+       ip nexthop add id 201 via 169.254.2.12 dev $rp22
+       ip nexthop add id 202 via 169.254.3.13 dev $rp23
+       ip nexthop add id 203 group 201/202
+       ip route add 192.0.2.0/24 vrf vrf-r2 nhid 203
+
+       ip nexthop add id 204 via fe80:2::12 dev $rp22
+       ip nexthop add id 205 via fe80:3::13 dev $rp23
+       ip nexthop add id 206 group 204/205
+       ip route add 2001:db8:1::/64 vrf vrf-r2 nhid 206
+}
+
+multipath4_test()
+{
+       local desc="$1"
+       local weight_rp12=$2
+       local weight_rp13=$3
+       local t0_rp12 t0_rp13 t1_rp12 t1_rp13
+       local packets_rp12 packets_rp13
+
+       # Transmit multiple flows from h1 to h2 and make sure they are
+       # distributed between both multipath links (rp12 and rp13)
+       # according to the configured weights.
+       sysctl_set net.ipv4.fib_multipath_hash_policy 1
+       ip nexthop replace id 103 group 101,$weight_rp12/102,$weight_rp13
+
+       t0_rp12=$(link_stats_tx_packets_get $rp12)
+       t0_rp13=$(link_stats_tx_packets_get $rp13)
+
+       ip vrf exec vrf-h1 $MZ -q -p 64 -A 192.0.2.2 -B 198.51.100.2 \
+               -d 1msec -t udp "sp=1024,dp=0-32768"
+
+       t1_rp12=$(link_stats_tx_packets_get $rp12)
+       t1_rp13=$(link_stats_tx_packets_get $rp13)
+
+       let "packets_rp12 = $t1_rp12 - $t0_rp12"
+       let "packets_rp13 = $t1_rp13 - $t0_rp13"
+       multipath_eval "$desc" $weight_rp12 $weight_rp13 $packets_rp12 $packets_rp13
+
+       # Restore settings.
+       ip nexthop replace id 103 group 101/102
+       sysctl_restore net.ipv4.fib_multipath_hash_policy
+}
+
+multipath6_l4_test()
+{
+       local desc="$1"
+       local weight_rp12=$2
+       local weight_rp13=$3
+       local t0_rp12 t0_rp13 t1_rp12 t1_rp13
+       local packets_rp12 packets_rp13
+
+       # Transmit multiple flows from h1 to h2 and make sure they are
+       # distributed between both multipath links (rp12 and rp13)
+       # according to the configured weights.
+       sysctl_set net.ipv6.fib_multipath_hash_policy 1
+
+       ip nexthop replace id 106 group 104,$weight_rp12/105,$weight_rp13
+
+       t0_rp12=$(link_stats_tx_packets_get $rp12)
+       t0_rp13=$(link_stats_tx_packets_get $rp13)
+
+       $MZ $h1 -6 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
+               -d 1msec -t udp "sp=1024,dp=0-32768"
+
+       t1_rp12=$(link_stats_tx_packets_get $rp12)
+       t1_rp13=$(link_stats_tx_packets_get $rp13)
+
+       let "packets_rp12 = $t1_rp12 - $t0_rp12"
+       let "packets_rp13 = $t1_rp13 - $t0_rp13"
+       multipath_eval "$desc" $weight_rp12 $weight_rp13 $packets_rp12 $packets_rp13
+
+       ip nexthop replace id 106 group 104/105
+
+       sysctl_restore net.ipv6.fib_multipath_hash_policy
+}
+
+multipath6_test()
+{
+       local desc="$1"
+       local weight_rp12=$2
+       local weight_rp13=$3
+       local t0_rp12 t0_rp13 t1_rp12 t1_rp13
+       local packets_rp12 packets_rp13
+
+       ip nexthop replace id 106 group 104,$weight_rp12/105,$weight_rp13
+
+       t0_rp12=$(link_stats_tx_packets_get $rp12)
+       t0_rp13=$(link_stats_tx_packets_get $rp13)
+
+       # Generate 16384 echo requests, each with a random flow label.
+       for _ in $(seq 1 16384); do
+               ip vrf exec vrf-h1 $PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1
+       done
+
+       t1_rp12=$(link_stats_tx_packets_get $rp12)
+       t1_rp13=$(link_stats_tx_packets_get $rp13)
+
+       let "packets_rp12 = $t1_rp12 - $t0_rp12"
+       let "packets_rp13 = $t1_rp13 - $t0_rp13"
+       multipath_eval "$desc" $weight_rp12 $weight_rp13 $packets_rp12 $packets_rp13
+
+       ip nexthop replace id 106 group 104/105
+}
+
+multipath_test()
+{
+       log_info "Running IPv4 multipath tests"
+       multipath4_test "ECMP" 1 1
+       multipath4_test "Weighted MP 2:1" 2 1
+       multipath4_test "Weighted MP 11:45" 11 45
+
+       log_info "Running IPv6 multipath tests"
+       multipath6_test "ECMP" 1 1
+       multipath6_test "Weighted MP 2:1" 2 1
+       multipath6_test "Weighted MP 11:45" 11 45
+
+       log_info "Running IPv6 L4 hash multipath tests"
+       multipath6_l4_test "ECMP" 1 1
+       multipath6_l4_test "Weighted MP 2:1" 2 1
+       multipath6_l4_test "Weighted MP 11:45" 11 45
+}
+
+setup_prepare()
+{
+       h1=${NETIFS[p1]}
+       rp11=${NETIFS[p2]}
+
+       rp12=${NETIFS[p3]}
+       rp22=${NETIFS[p4]}
+
+       rp13=${NETIFS[p5]}
+       rp23=${NETIFS[p6]}
+
+       rp21=${NETIFS[p7]}
+       h2=${NETIFS[p8]}
+
+       vrf_prepare
+
+       h1_create
+       h2_create
+
+       router1_create
+       router2_create
+       routing_nh_obj
+
+       forwarding_enable
+}
+
+cleanup()
+{
+       pre_cleanup
+
+       forwarding_restore
+
+       router2_destroy
+       router1_destroy
+
+       h2_destroy
+       h1_destroy
+
+       vrf_cleanup
+}
+
+ping_ipv4()
+{
+       ping_test $h1 198.51.100.2
+}
+
+ping_ipv6()
+{
+       ping6_test $h1 2001:db8:2::2
+}
+
+ip nexthop ls >/dev/null 2>&1
+if [ $? -ne 0 ]; then
+       echo "Nexthop objects not supported; skipping tests"
+       exit 0
+fi
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+routing_nh_obj
+
+tests_run
+
+exit $EXIT_STATUS