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0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0
0003 
0004 # Test traffic distribution when a wECMP route forwards traffic to two GRE
0005 # tunnels.
0006 #
0007 # +-------------------------+
0008 # | H1                      |
0009 # |               $h1 +     |
0010 # |      192.0.2.1/28 |     |
0011 # |  2001:db8:1::1/64 |     |
0012 # +-------------------|-----+
0013 #                     |
0014 # +-------------------|------------------------+
0015 # | SW1               |                        |
0016 # |              $ol1 +                        |
0017 # |      192.0.2.2/28                          |
0018 # |  2001:db8:1::2/64                          |
0019 # |                                            |
0020 # |  + g1a (gre)          + g1b (gre)          |
0021 # |    loc=192.0.2.65       loc=192.0.2.81     |
0022 # |    rem=192.0.2.66 --.   rem=192.0.2.82 --. |
0023 # |    tos=inherit      |   tos=inherit      | |
0024 # |  .------------------'                    | |
0025 # |  |                    .------------------' |
0026 # |  v                    v                    |
0027 # |  + $ul1.111 (vlan)    + $ul1.222 (vlan)    |
0028 # |  | 192.0.2.129/28     | 192.0.2.145/28     |
0029 # |   \                  /                     |
0030 # |    \________________/                      |
0031 # |            |                               |
0032 # |            + $ul1                          |
0033 # +------------|-------------------------------+
0034 #              |
0035 # +------------|-------------------------------+
0036 # | SW2        + $ul2                          |
0037 # |     _______|________                       |
0038 # |    /                \                      |
0039 # |   /                  \                     |
0040 # |  + $ul2.111 (vlan)    + $ul2.222 (vlan)    |
0041 # |  ^ 192.0.2.130/28     ^ 192.0.2.146/28     |
0042 # |  |                    |                    |
0043 # |  |                    '------------------. |
0044 # |  '------------------.                    | |
0045 # |  + g2a (gre)        | + g2b (gre)        | |
0046 # |    loc=192.0.2.66   |   loc=192.0.2.82   | |
0047 # |    rem=192.0.2.65 --'   rem=192.0.2.81 --' |
0048 # |    tos=inherit          tos=inherit        |
0049 # |                                            |
0050 # |              $ol2 +                        |
0051 # |     192.0.2.17/28 |                        |
0052 # |  2001:db8:2::1/64 |                        |
0053 # +-------------------|------------------------+
0054 #                     |
0055 # +-------------------|-----+
0056 # | H2                |     |
0057 # |               $h2 +     |
0058 # |     192.0.2.18/28       |
0059 # |  2001:db8:2::2/64       |
0060 # +-------------------------+
0061 
0062 ALL_TESTS="
0063         ping_ipv4
0064         ping_ipv6
0065         multipath_ipv4
0066         multipath_ipv6
0067         multipath_ipv6_l4
0068 "
0069 
0070 NUM_NETIFS=6
0071 source lib.sh
0072 
0073 h1_create()
0074 {
0075         simple_if_init $h1 192.0.2.1/28 2001:db8:1::1/64
0076         ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2
0077         ip route add vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
0078 }
0079 
0080 h1_destroy()
0081 {
0082         ip route del vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
0083         ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2
0084         simple_if_fini $h1 192.0.2.1/28
0085 }
0086 
0087 sw1_create()
0088 {
0089         simple_if_init $ol1 192.0.2.2/28 2001:db8:1::2/64
0090         __simple_if_init $ul1 v$ol1
0091         vlan_create $ul1 111 v$ol1 192.0.2.129/28
0092         vlan_create $ul1 222 v$ol1 192.0.2.145/28
0093 
0094         tunnel_create g1a gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1
0095         __simple_if_init g1a v$ol1 192.0.2.65/32
0096         ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130
0097 
0098         tunnel_create g1b gre 192.0.2.81 192.0.2.82 tos inherit dev v$ol1
0099         __simple_if_init g1b v$ol1 192.0.2.81/32
0100         ip route add vrf v$ol1 192.0.2.82/32 via 192.0.2.146
0101 
0102         ip -6 nexthop add id 101 dev g1a
0103         ip -6 nexthop add id 102 dev g1b
0104         ip nexthop add id 103 group 101/102 type resilient buckets 512 \
0105                 idle_timer 0
0106 
0107         ip route add vrf v$ol1 192.0.2.16/28 nhid 103
0108         ip route add vrf v$ol1 2001:db8:2::/64 nhid 103
0109 }
0110 
0111 sw1_destroy()
0112 {
0113         ip route del vrf v$ol1 2001:db8:2::/64
0114         ip route del vrf v$ol1 192.0.2.16/28
0115 
0116         ip nexthop del id 103
0117         ip -6 nexthop del id 102
0118         ip -6 nexthop del id 101
0119 
0120         ip route del vrf v$ol1 192.0.2.82/32 via 192.0.2.146
0121         __simple_if_fini g1b 192.0.2.81/32
0122         tunnel_destroy g1b
0123 
0124         ip route del vrf v$ol1 192.0.2.66/32 via 192.0.2.130
0125         __simple_if_fini g1a 192.0.2.65/32
0126         tunnel_destroy g1a
0127 
0128         vlan_destroy $ul1 222
0129         vlan_destroy $ul1 111
0130         __simple_if_fini $ul1
0131         simple_if_fini $ol1 192.0.2.2/28 2001:db8:1::2/64
0132 }
0133 
0134 sw2_create()
0135 {
0136         simple_if_init $ol2 192.0.2.17/28 2001:db8:2::1/64
0137         __simple_if_init $ul2 v$ol2
0138         vlan_create $ul2 111 v$ol2 192.0.2.130/28
0139         vlan_create $ul2 222 v$ol2 192.0.2.146/28
0140 
0141         tunnel_create g2a gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol2
0142         __simple_if_init g2a v$ol2 192.0.2.66/32
0143         ip route add vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0144 
0145         tunnel_create g2b gre 192.0.2.82 192.0.2.81 tos inherit dev v$ol2
0146         __simple_if_init g2b v$ol2 192.0.2.82/32
0147         ip route add vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0148 
0149         ip -6 nexthop add id 201 dev g2a
0150         ip -6 nexthop add id 202 dev g2b
0151         ip nexthop add id 203 group 201/202 type resilient buckets 512 \
0152                 idle_timer 0
0153 
0154         ip route add vrf v$ol2 192.0.2.0/28 nhid 203
0155         ip route add vrf v$ol2 2001:db8:1::/64 nhid 203
0156 
0157         tc qdisc add dev $ul2 clsact
0158         tc filter add dev $ul2 ingress pref 111 prot 802.1Q \
0159            flower vlan_id 111 action pass
0160         tc filter add dev $ul2 ingress pref 222 prot 802.1Q \
0161            flower vlan_id 222 action pass
0162 }
0163 
0164 sw2_destroy()
0165 {
0166         tc qdisc del dev $ul2 clsact
0167 
0168         ip route del vrf v$ol2 2001:db8:1::/64
0169         ip route del vrf v$ol2 192.0.2.0/28
0170 
0171         ip nexthop del id 203
0172         ip -6 nexthop del id 202
0173         ip -6 nexthop del id 201
0174 
0175         ip route del vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0176         __simple_if_fini g2b 192.0.2.82/32
0177         tunnel_destroy g2b
0178 
0179         ip route del vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0180         __simple_if_fini g2a 192.0.2.66/32
0181         tunnel_destroy g2a
0182 
0183         vlan_destroy $ul2 222
0184         vlan_destroy $ul2 111
0185         __simple_if_fini $ul2
0186         simple_if_fini $ol2 192.0.2.17/28 2001:db8:2::1/64
0187 }
0188 
0189 h2_create()
0190 {
0191         simple_if_init $h2 192.0.2.18/28 2001:db8:2::2/64
0192         ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
0193         ip route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
0194 }
0195 
0196 h2_destroy()
0197 {
0198         ip route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
0199         ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
0200         simple_if_fini $h2 192.0.2.18/28 2001:db8:2::2/64
0201 }
0202 
0203 setup_prepare()
0204 {
0205         h1=${NETIFS[p1]}
0206         ol1=${NETIFS[p2]}
0207 
0208         ul1=${NETIFS[p3]}
0209         ul2=${NETIFS[p4]}
0210 
0211         ol2=${NETIFS[p5]}
0212         h2=${NETIFS[p6]}
0213 
0214         vrf_prepare
0215         h1_create
0216         sw1_create
0217         sw2_create
0218         h2_create
0219 
0220         forwarding_enable
0221 }
0222 
0223 cleanup()
0224 {
0225         pre_cleanup
0226 
0227         forwarding_restore
0228 
0229         h2_destroy
0230         sw2_destroy
0231         sw1_destroy
0232         h1_destroy
0233         vrf_cleanup
0234 }
0235 
0236 multipath4_test()
0237 {
0238         local what=$1; shift
0239         local weight1=$1; shift
0240         local weight2=$1; shift
0241 
0242         sysctl_set net.ipv4.fib_multipath_hash_policy 1
0243         ip nexthop replace id 103 group 101,$weight1/102,$weight2 \
0244                 type resilient
0245 
0246         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0247         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0248 
0249         ip vrf exec v$h1 \
0250            $MZ $h1 -q -p 64 -A 192.0.2.1 -B 192.0.2.18 \
0251                -d 1msec -t udp "sp=1024,dp=0-32768"
0252 
0253         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0254         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0255 
0256         local d111=$((t1_111 - t0_111))
0257         local d222=$((t1_222 - t0_222))
0258         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0259 
0260         ip nexthop replace id 103 group 101/102 type resilient
0261         sysctl_restore net.ipv4.fib_multipath_hash_policy
0262 }
0263 
0264 multipath6_test()
0265 {
0266         local what=$1; shift
0267         local weight1=$1; shift
0268         local weight2=$1; shift
0269 
0270         sysctl_set net.ipv6.fib_multipath_hash_policy 0
0271         ip nexthop replace id 103 group 101,$weight1/102,$weight2 \
0272                 type resilient
0273 
0274         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0275         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0276 
0277         # Generate 16384 echo requests, each with a random flow label.
0278         for ((i=0; i < 16384; ++i)); do
0279                 ip vrf exec v$h1 $PING6 2001:db8:2::2 -F 0 -c 1 -q &> /dev/null
0280         done
0281 
0282         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0283         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0284 
0285         local d111=$((t1_111 - t0_111))
0286         local d222=$((t1_222 - t0_222))
0287         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0288 
0289         ip nexthop replace id 103 group 101/102 type resilient
0290         sysctl_restore net.ipv6.fib_multipath_hash_policy
0291 }
0292 
0293 multipath6_l4_test()
0294 {
0295         local what=$1; shift
0296         local weight1=$1; shift
0297         local weight2=$1; shift
0298 
0299         sysctl_set net.ipv6.fib_multipath_hash_policy 1
0300         ip nexthop replace id 103 group 101,$weight1/102,$weight2 \
0301                 type resilient
0302 
0303         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0304         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0305 
0306         ip vrf exec v$h1 \
0307                 $MZ $h1 -6 -q -p 64 -A 2001:db8:1::1 -B 2001:db8:2::2 \
0308                 -d 1msec -t udp "sp=1024,dp=0-32768"
0309 
0310         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0311         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0312 
0313         local d111=$((t1_111 - t0_111))
0314         local d222=$((t1_222 - t0_222))
0315         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0316 
0317         ip nexthop replace id 103 group 101/102 type resilient
0318         sysctl_restore net.ipv6.fib_multipath_hash_policy
0319 }
0320 
0321 ping_ipv4()
0322 {
0323         ping_test $h1 192.0.2.18
0324 }
0325 
0326 ping_ipv6()
0327 {
0328         ping6_test $h1 2001:db8:2::2
0329 }
0330 
0331 multipath_ipv4()
0332 {
0333         log_info "Running IPv4 multipath tests"
0334         multipath4_test "ECMP" 1 1
0335         multipath4_test "Weighted MP 2:1" 2 1
0336         multipath4_test "Weighted MP 11:45" 11 45
0337 }
0338 
0339 multipath_ipv6()
0340 {
0341         log_info "Running IPv6 multipath tests"
0342         multipath6_test "ECMP" 1 1
0343         multipath6_test "Weighted MP 2:1" 2 1
0344         multipath6_test "Weighted MP 11:45" 11 45
0345 }
0346 
0347 multipath_ipv6_l4()
0348 {
0349         log_info "Running IPv6 L4 hash multipath tests"
0350         multipath6_l4_test "ECMP" 1 1
0351         multipath6_l4_test "Weighted MP 2:1" 2 1
0352         multipath6_l4_test "Weighted MP 11:45" 11 45
0353 }
0354 
0355 trap cleanup EXIT
0356 
0357 setup_prepare
0358 setup_wait
0359 tests_run
0360 
0361 exit $EXIT_STATUS
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