OSCL-LXR linux-6.0.1/​tools/​testing/​selftests/​net/​forwarding/​gre_custom_multipath_hash.sh	Source navigation Diff markup Identifier search General search
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 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 #
 # Test traffic distribution when there are multiple paths between an IPv4 GRE
 # tunnel. The tunnel carries IPv4 and 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 +      |
 # |   198.51.100.{2-253}/24 |      |
 # |   2001:db8:1::{2-fd}/64 |      |
 # +-------------------------|------+
 #                           |
 # +-------------------------|------------------+
 # | SW1                     |                  |
 # |                    $ol1 +                  |
 # |         198.51.100.1/24                    |
 # |        2001:db8:1::1/64                    |
 # |                                            |
 # |   + g1 (gre)                               |
 # |     loc=192.0.2.1                          |
 # |     rem=192.0.2.2 --.                      |
 # |     tos=inherit     |                      |
 # |                     v                      |
 # |                     + $ul1                 |
 # |                     | 192.0.2.17/28        |
 # +---------------------|----------------------+
 #                       |
 # +---------------------|----------------------+
 # | SW2                 |                      |
 # |               $ul21 +                      |
 # |       192.0.2.18/28 |                      |
 # |                     |                      |
 # !   __________________+___                   |
 # |  /                      \                  |
 # |  |                      |                  |
 # |  + $ul22.111 (vlan)     + $ul22.222 (vlan) |
 # |  | 192.0.2.33/28        | 192.0.2.49/28    |
 # |  |                      |                  |
 # +--|----------------------|------------------+
 #    |                      |
 # +--|----------------------|------------------+
 # |  |                      |                  |
 # |  + $ul32.111 (vlan)     + $ul32.222 (vlan) |
 # |  | 192.0.2.34/28        | 192.0.2.50/28    |
 # |  |                      |                  |
 # |  \__________________+___/                  |
 # |                     |                      |
 # |                     |                      |
 # |               $ul31 +                      |
 # |       192.0.2.65/28 |                  SW3 |
 # +---------------------|----------------------+
 #                       |
 # +---------------------|----------------------+
 # |                     + $ul4                 |
 # |                     ^ 192.0.2.66/28        |
 # |                     |                      |
 # |   + g2 (gre)        |                      |
 # |     loc=192.0.2.2   |                      |
 # |     rem=192.0.2.1 --'                      |
 # |     tos=inherit                            |
 # |                                            |
 # |                    $ol4 +                  |
 # |          203.0.113.1/24 |                  |
 # |        2001:db8:2::1/64 |              SW4 |
 # +-------------------------|------------------+
 #                           |
 # +-------------------------|------+
 # |                         |      |
 # |                     $h2 +      |
 # |    203.0.113.{2-253}/24        |
 # |   2001:db8:2::{2-fd}/64     H2 |
 # +--------------------------------+
 
 ALL_TESTS="
         ping_ipv4
         ping_ipv6
         custom_hash
 "
 
 NUM_NETIFS=10
 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 $ol1 198.51.100.1/24 2001:db8:1::1/64
         __simple_if_init $ul1 v$ol1 192.0.2.17/28
 
         tunnel_create g1 gre 192.0.2.1 192.0.2.2 tos inherit dev v$ol1
         __simple_if_init g1 v$ol1 192.0.2.1/32
         ip route add vrf v$ol1 192.0.2.2/32 via 192.0.2.18
 
         ip route add vrf v$ol1 203.0.113.0/24 dev g1
         ip -6 route add vrf v$ol1 2001:db8:2::/64 dev g1
 }
 
 sw1_destroy()
 {
         ip -6 route del vrf v$ol1 2001:db8:2::/64
         ip route del vrf v$ol1 203.0.113.0/24
 
         ip route del vrf v$ol1 192.0.2.2/32
         __simple_if_fini g1 192.0.2.1/32
         tunnel_destroy g1
 
         __simple_if_fini $ul1 192.0.2.17/28
         simple_if_fini $ol1 198.51.100.1/24 2001:db8:1::1/64
 }
 
 sw2_create()
 {
         simple_if_init $ul21 192.0.2.18/28
         __simple_if_init $ul22 v$ul21
         vlan_create $ul22 111 v$ul21 192.0.2.33/28
         vlan_create $ul22 222 v$ul21 192.0.2.49/28
 
         ip route add vrf v$ul21 192.0.2.1/32 via 192.0.2.17
         ip route add vrf v$ul21 192.0.2.2/32 \
            nexthop via 192.0.2.34 \
            nexthop via 192.0.2.50
 }
 
 sw2_destroy()
 {
         ip route del vrf v$ul21 192.0.2.2/32
         ip route del vrf v$ul21 192.0.2.1/32
 
         vlan_destroy $ul22 222
         vlan_destroy $ul22 111
         __simple_if_fini $ul22
         simple_if_fini $ul21 192.0.2.18/28
 }
 
 sw3_create()
 {
         simple_if_init $ul31 192.0.2.65/28
         __simple_if_init $ul32 v$ul31
         vlan_create $ul32 111 v$ul31 192.0.2.34/28
         vlan_create $ul32 222 v$ul31 192.0.2.50/28
 
         ip route add vrf v$ul31 192.0.2.2/32 via 192.0.2.66
         ip route add vrf v$ul31 192.0.2.1/32 \
            nexthop via 192.0.2.33 \
            nexthop via 192.0.2.49
 
         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 route del vrf v$ul31 192.0.2.1/32
         ip route del vrf v$ul31 192.0.2.2/32
 
         vlan_destroy $ul32 222
         vlan_destroy $ul32 111
         __simple_if_fini $ul32
         simple_if_fini $ul31 192.0.2.65/28
 }
 
 sw4_create()
 {
         simple_if_init $ol4 203.0.113.1/24 2001:db8:2::1/64
         __simple_if_init $ul4 v$ol4 192.0.2.66/28
 
         tunnel_create g2 gre 192.0.2.2 192.0.2.1 tos inherit dev v$ol4
         __simple_if_init g2 v$ol4 192.0.2.2/32
         ip route add vrf v$ol4 192.0.2.1/32 via 192.0.2.65
 
         ip route add vrf v$ol4 198.51.100.0/24 dev g2
         ip -6 route add vrf v$ol4 2001:db8:1::/64 dev g2
 }
 
 sw4_destroy()
 {
         ip -6 route del vrf v$ol4 2001:db8:1::/64
         ip route del vrf v$ol4 198.51.100.0/24
 
         ip route del vrf v$ol4 192.0.2.1/32
         __simple_if_fini g2 192.0.2.2/32
         tunnel_destroy g2
 
         __simple_if_fini $ul4 192.0.2.66/28
         simple_if_fini $ol4 203.0.113.1/24 2001:db8:2::1/64
 }
 
 h2_create()
 {
         simple_if_init $h2 203.0.113.2/24 2001:db8:2::2/64
         ip route add vrf v$h2 default via 203.0.113.1 dev $h2
         ip -6 route add vrf v$h2 default via 2001:db8:2::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:db8:2::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
 }
 
 ping_ipv4()
 {
         ping_test $h1 203.0.113.2
 }
 
 ping_ipv6()
 {
         ping6_test $h1 2001:db8:2::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:db8:2::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:db8:2::2-2001:db8:2::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:db8:2::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:db8:2::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:db8:2::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_111=$(tc_rule_stats_get $ul32 111 ingress)
         local t0_222=$(tc_rule_stats_get $ul32 222 ingress)
 
         $send_flows
 
         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))
 
         local diff=$((d222 - d111))
         local sum=$((d111 + d222))
 
         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: $d111 / $d222"
 }
 
 custom_hash_v4()
 {
         log_info "Running IPv4 overlay custom multipath hash tests"
 
         # 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 0x0040
         custom_hash_test "Inner source IP" "balanced" send_src_ipv4
         custom_hash_test "Inner source IP" "unbalanced" send_dst_ipv4
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0080
         custom_hash_test "Inner destination IP" "balanced" send_dst_ipv4
         custom_hash_test "Inner destination IP" "unbalanced" send_src_ipv4
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0400
         custom_hash_test "Inner source port" "balanced" send_src_udp4
         custom_hash_test "Inner source port" "unbalanced" send_dst_udp4
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0800
         custom_hash_test "Inner destination port" "balanced" send_dst_udp4
         custom_hash_test "Inner 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
 }
 
 custom_hash_v6()
 {
         log_info "Running IPv6 overlay custom multipath hash tests"
 
         # 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.ipv4.fib_multipath_hash_fields 0x0040
         custom_hash_test "Inner source IP" "balanced" send_src_ipv6
         custom_hash_test "Inner source IP" "unbalanced" send_dst_ipv6
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0080
         custom_hash_test "Inner destination IP" "balanced" send_dst_ipv6
         custom_hash_test "Inner destination IP" "unbalanced" send_src_ipv6
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0200
         custom_hash_test "Inner flowlabel" "balanced" send_flowlabel
         custom_hash_test "Inner flowlabel" "unbalanced" send_src_ipv6
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0400
         custom_hash_test "Inner source port" "balanced" send_src_udp6
         custom_hash_test "Inner source port" "unbalanced" send_dst_udp6
 
         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0800
         custom_hash_test "Inner destination port" "balanced" send_dst_udp6
         custom_hash_test "Inner 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
 }
 
 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.
 
         sysctl_set net.ipv4.fib_multipath_hash_policy 3
 
         custom_hash_v4
         custom_hash_v6
 
         sysctl_restore net.ipv4.fib_multipath_hash_policy
 }
 
 trap cleanup EXIT
 
 setup_prepare
 setup_wait
 tests_run
 
 exit $EXIT_STATUS

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