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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
0105 
0106         ip route add vrf v$ol1 192.0.2.16/28 nhid 103
0107         ip route add vrf v$ol1 2001:db8:2::/64 nhid 103
0108 }
0109 
0110 sw1_destroy()
0111 {
0112         ip route del vrf v$ol1 2001:db8:2::/64
0113         ip route del vrf v$ol1 192.0.2.16/28
0114 
0115         ip nexthop del id 103
0116         ip -6 nexthop del id 102
0117         ip -6 nexthop del id 101
0118 
0119         ip route del vrf v$ol1 192.0.2.82/32 via 192.0.2.146
0120         __simple_if_fini g1b 192.0.2.81/32
0121         tunnel_destroy g1b
0122 
0123         ip route del vrf v$ol1 192.0.2.66/32 via 192.0.2.130
0124         __simple_if_fini g1a 192.0.2.65/32
0125         tunnel_destroy g1a
0126 
0127         vlan_destroy $ul1 222
0128         vlan_destroy $ul1 111
0129         __simple_if_fini $ul1
0130         simple_if_fini $ol1 192.0.2.2/28 2001:db8:1::2/64
0131 }
0132 
0133 sw2_create()
0134 {
0135         simple_if_init $ol2 192.0.2.17/28 2001:db8:2::1/64
0136         __simple_if_init $ul2 v$ol2
0137         vlan_create $ul2 111 v$ol2 192.0.2.130/28
0138         vlan_create $ul2 222 v$ol2 192.0.2.146/28
0139 
0140         tunnel_create g2a gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol2
0141         __simple_if_init g2a v$ol2 192.0.2.66/32
0142         ip route add vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0143 
0144         tunnel_create g2b gre 192.0.2.82 192.0.2.81 tos inherit dev v$ol2
0145         __simple_if_init g2b v$ol2 192.0.2.82/32
0146         ip route add vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0147 
0148         ip -6 nexthop add id 201 dev g2a
0149         ip -6 nexthop add id 202 dev g2b
0150         ip nexthop add id 203 group 201/202
0151 
0152         ip route add vrf v$ol2 192.0.2.0/28 nhid 203
0153         ip route add vrf v$ol2 2001:db8:1::/64 nhid 203
0154 
0155         tc qdisc add dev $ul2 clsact
0156         tc filter add dev $ul2 ingress pref 111 prot 802.1Q \
0157            flower vlan_id 111 action pass
0158         tc filter add dev $ul2 ingress pref 222 prot 802.1Q \
0159            flower vlan_id 222 action pass
0160 }
0161 
0162 sw2_destroy()
0163 {
0164         tc qdisc del dev $ul2 clsact
0165 
0166         ip route del vrf v$ol2 2001:db8:1::/64
0167         ip route del vrf v$ol2 192.0.2.0/28
0168 
0169         ip nexthop del id 203
0170         ip -6 nexthop del id 202
0171         ip -6 nexthop del id 201
0172 
0173         ip route del vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0174         __simple_if_fini g2b 192.0.2.82/32
0175         tunnel_destroy g2b
0176 
0177         ip route del vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0178         __simple_if_fini g2a 192.0.2.66/32
0179         tunnel_destroy g2a
0180 
0181         vlan_destroy $ul2 222
0182         vlan_destroy $ul2 111
0183         __simple_if_fini $ul2
0184         simple_if_fini $ol2 192.0.2.17/28 2001:db8:2::1/64
0185 }
0186 
0187 h2_create()
0188 {
0189         simple_if_init $h2 192.0.2.18/28 2001:db8:2::2/64
0190         ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
0191         ip route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
0192 }
0193 
0194 h2_destroy()
0195 {
0196         ip route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
0197         ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
0198         simple_if_fini $h2 192.0.2.18/28 2001:db8:2::2/64
0199 }
0200 
0201 setup_prepare()
0202 {
0203         h1=${NETIFS[p1]}
0204         ol1=${NETIFS[p2]}
0205 
0206         ul1=${NETIFS[p3]}
0207         ul2=${NETIFS[p4]}
0208 
0209         ol2=${NETIFS[p5]}
0210         h2=${NETIFS[p6]}
0211 
0212         vrf_prepare
0213         h1_create
0214         sw1_create
0215         sw2_create
0216         h2_create
0217 
0218         forwarding_enable
0219 }
0220 
0221 cleanup()
0222 {
0223         pre_cleanup
0224 
0225         forwarding_restore
0226 
0227         h2_destroy
0228         sw2_destroy
0229         sw1_destroy
0230         h1_destroy
0231         vrf_cleanup
0232 }
0233 
0234 multipath4_test()
0235 {
0236         local what=$1; shift
0237         local weight1=$1; shift
0238         local weight2=$1; shift
0239 
0240         sysctl_set net.ipv4.fib_multipath_hash_policy 1
0241         ip nexthop replace id 103 group 101,$weight1/102,$weight2
0242 
0243         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0244         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0245 
0246         ip vrf exec v$h1 \
0247            $MZ $h1 -q -p 64 -A 192.0.2.1 -B 192.0.2.18 \
0248                -d 1msec -t udp "sp=1024,dp=0-32768"
0249 
0250         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0251         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0252 
0253         local d111=$((t1_111 - t0_111))
0254         local d222=$((t1_222 - t0_222))
0255         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0256 
0257         ip nexthop replace id 103 group 101/102
0258         sysctl_restore net.ipv4.fib_multipath_hash_policy
0259 }
0260 
0261 multipath6_test()
0262 {
0263         local what=$1; shift
0264         local weight1=$1; shift
0265         local weight2=$1; shift
0266 
0267         sysctl_set net.ipv6.fib_multipath_hash_policy 0
0268         ip nexthop replace id 103 group 101,$weight1/102,$weight2
0269 
0270         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0271         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0272 
0273         # Generate 16384 echo requests, each with a random flow label.
0274         for ((i=0; i < 16384; ++i)); do
0275                 ip vrf exec v$h1 $PING6 2001:db8:2::2 -F 0 -c 1 -q &> /dev/null
0276         done
0277 
0278         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0279         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0280 
0281         local d111=$((t1_111 - t0_111))
0282         local d222=$((t1_222 - t0_222))
0283         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0284 
0285         ip nexthop replace id 103 group 101/102
0286         sysctl_restore net.ipv6.fib_multipath_hash_policy
0287 }
0288 
0289 multipath6_l4_test()
0290 {
0291         local what=$1; shift
0292         local weight1=$1; shift
0293         local weight2=$1; shift
0294 
0295         sysctl_set net.ipv6.fib_multipath_hash_policy 1
0296         ip nexthop replace id 103 group 101,$weight1/102,$weight2
0297 
0298         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0299         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0300 
0301         ip vrf exec v$h1 \
0302                 $MZ $h1 -6 -q -p 64 -A 2001:db8:1::1 -B 2001:db8:2::2 \
0303                 -d 1msec -t udp "sp=1024,dp=0-32768"
0304 
0305         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0306         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0307 
0308         local d111=$((t1_111 - t0_111))
0309         local d222=$((t1_222 - t0_222))
0310         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0311 
0312         ip nexthop replace id 103 group 101/102
0313         sysctl_restore net.ipv6.fib_multipath_hash_policy
0314 }
0315 
0316 ping_ipv4()
0317 {
0318         ping_test $h1 192.0.2.18
0319 }
0320 
0321 ping_ipv6()
0322 {
0323         ping6_test $h1 2001:db8:2::2
0324 }
0325 
0326 multipath_ipv4()
0327 {
0328         log_info "Running IPv4 multipath tests"
0329         multipath4_test "ECMP" 1 1
0330         multipath4_test "Weighted MP 2:1" 2 1
0331         multipath4_test "Weighted MP 11:45" 11 45
0332 }
0333 
0334 multipath_ipv6()
0335 {
0336         log_info "Running IPv6 multipath tests"
0337         multipath6_test "ECMP" 1 1
0338         multipath6_test "Weighted MP 2:1" 2 1
0339         multipath6_test "Weighted MP 11:45" 11 45
0340 }
0341 
0342 multipath_ipv6_l4()
0343 {
0344         log_info "Running IPv6 L4 hash multipath tests"
0345         multipath6_l4_test "ECMP" 1 1
0346         multipath6_l4_test "Weighted MP 2:1" 2 1
0347         multipath6_l4_test "Weighted MP 11:45" 11 45
0348 }
0349 
0350 trap cleanup EXIT
0351 
0352 setup_prepare
0353 setup_wait
0354 tests_run
0355 
0356 exit $EXIT_STATUS
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