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0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0
0003 
0004 # Test traffic distribution when there are multiple routes between an IPv6
0005 # GRE tunnel. The tunnel carries IPv4 traffic between multiple hosts.
0006 # Multiple routes are in the underlay network. With the default multipath
0007 # policy, SW2 will only look at the outer IP addresses, hence only a single
0008 # route would be used.
0009 #
0010 # +-------------------------+
0011 # | H1                      |
0012 # |               $h1 +     |
0013 # | 192.0.3.{2-62}/24 |     |
0014 # +-------------------|-----+
0015 #                     |
0016 # +-------------------|-------------------------+
0017 # | SW1               |                         |
0018 # |              $ol1 +                         |
0019 # |      192.0.3.1/24                           |
0020 # |                                             |
0021 # |  + g1 (gre)                                 |
0022 # |    loc=2001:db8:40::1                       |
0023 # |    rem=2001:db8:40::2 --.                   |
0024 # |    tos=inherit          |                   |
0025 # |                         v                   |
0026 # |                         + $ul1              |
0027 # |                         | 2001:db8:80::1/64 |
0028 # +-------------------------|-------------------+
0029 #                           |
0030 # +-------------------------|-------------------+
0031 # | SW2                     |                   |
0032 # |                   $ul21 +                   |
0033 # |       2001:db8:80::2/64                     |
0034 # |                   |                         |
0035 # !   ________________|_____                    |
0036 # |  /                      \                   |
0037 # |  |                      |                   |
0038 # |  + $ul22.111 (vlan)     + $ul22.222 (vlan)  |
0039 # |  | 2001:db8:81::1/64    | 2001:db8:82::1/64 |
0040 # |  |                      |                   |
0041 # +--|----------------------|-------------------+
0042 #    |                      |
0043 # +--|----------------------|-------------------+
0044 # |  |                      |                   |
0045 # |  + $ul32.111 (vlan)     + $ul32.222 (vlan)  |
0046 # |  | 2001:db8:81::2/64    | 2001:db8:82::2/64 |
0047 # |  |                      |                   |
0048 # |  \______________________/                   |
0049 # |                   |                         |
0050 # |                   |                         |
0051 # |                   $ul31 +                   |
0052 # |       2001:db8:83::2/64 |               SW3 |
0053 # +-------------------------|-------------------+
0054 #                           |
0055 # +-------------------------|-------------------+
0056 # |                         + $ul4              |
0057 # |                         ^ 2001:db8:83::1/64 |
0058 # |  + g2 (gre)             |                   |
0059 # |    loc=2001:db8:40::2   |                   |
0060 # |    rem=2001:db8:40::1 --'                   |
0061 # |    tos=inherit                              |
0062 # |                                             |
0063 # |               $ol4 +                        |
0064 # |       192.0.4.1/24 |                    SW4 |
0065 # +--------------------|------------------------+
0066 #                      |
0067 # +--------------------|---------+
0068 # |                    |         |
0069 # |                $h2 +         |
0070 # |  192.0.4.{2-62}/24        H2 |
0071 # +------------------------------+
0072 
0073 ALL_TESTS="
0074         ping_ipv4
0075         multipath_ipv4
0076 "
0077 
0078 NUM_NETIFS=10
0079 source lib.sh
0080 
0081 h1_create()
0082 {
0083         simple_if_init $h1 192.0.3.2/24
0084         ip route add vrf v$h1 192.0.4.0/24 via 192.0.3.1
0085 }
0086 
0087 h1_destroy()
0088 {
0089         ip route del vrf v$h1 192.0.4.0/24 via 192.0.3.1
0090         simple_if_fini $h1 192.0.3.2/24
0091 }
0092 
0093 sw1_create()
0094 {
0095         simple_if_init $ol1 192.0.3.1/24
0096         __simple_if_init $ul1 v$ol1 2001:db8:80::1/64
0097 
0098         tunnel_create g1 ip6gre 2001:db8:40::1 2001:db8:40::2 tos inherit dev v$ol1
0099         __simple_if_init g1 v$ol1 2001:db8:40::1/128
0100         ip -6 route add vrf v$ol1 2001:db8:40::2/128 via 2001:db8:80::2
0101 
0102         ip route add vrf v$ol1 192.0.4.0/24 nexthop dev g1
0103 }
0104 
0105 sw1_destroy()
0106 {
0107         ip route del vrf v$ol1 192.0.4.0/24
0108 
0109         ip -6 route del vrf v$ol1 2001:db8:40::2/128
0110         __simple_if_fini g1 2001:db8:40::1/128
0111         tunnel_destroy g1
0112 
0113         __simple_if_fini $ul1 2001:db8:80::1/64
0114         simple_if_fini $ol1 192.0.3.1/24
0115 }
0116 
0117 sw2_create()
0118 {
0119         simple_if_init $ul21 2001:db8:80::2/64
0120         __simple_if_init $ul22 v$ul21
0121         vlan_create $ul22 111 v$ul21 2001:db8:81::1/64
0122         vlan_create $ul22 222 v$ul21 2001:db8:82::1/64
0123 
0124         ip -6 route add vrf v$ul21 2001:db8:40::1/128 via 2001:db8:80::1
0125         ip -6 route add vrf v$ul21 2001:db8:40::2/128 \
0126            nexthop via 2001:db8:81::2 \
0127            nexthop via 2001:db8:82::2
0128 }
0129 
0130 sw2_destroy()
0131 {
0132         ip -6 route del vrf v$ul21 2001:db8:40::2/128
0133         ip -6 route del vrf v$ul21 2001:db8:40::1/128
0134 
0135         vlan_destroy $ul22 222
0136         vlan_destroy $ul22 111
0137         __simple_if_fini $ul22
0138         simple_if_fini $ul21 2001:db8:80::2/64
0139 }
0140 
0141 sw3_create()
0142 {
0143         simple_if_init $ul31 2001:db8:83::2/64
0144         __simple_if_init $ul32 v$ul31
0145         vlan_create $ul32 111 v$ul31 2001:db8:81::2/64
0146         vlan_create $ul32 222 v$ul31 2001:db8:82::2/64
0147 
0148         ip -6 route add vrf v$ul31 2001:db8:40::2/128 via 2001:db8:83::1
0149         ip -6 route add vrf v$ul31 2001:db8:40::1/128 \
0150            nexthop via 2001:db8:81::1 \
0151            nexthop via 2001:db8:82::1
0152 
0153         tc qdisc add dev $ul32 clsact
0154         tc filter add dev $ul32 ingress pref 111 prot 802.1Q \
0155            flower vlan_id 111 action pass
0156         tc filter add dev $ul32 ingress pref 222 prot 802.1Q \
0157            flower vlan_id 222 action pass
0158 }
0159 
0160 sw3_destroy()
0161 {
0162         tc qdisc del dev $ul32 clsact
0163 
0164         ip -6 route del vrf v$ul31 2001:db8:40::1/128
0165         ip -6 route del vrf v$ul31 2001:db8:40::2/128
0166 
0167         vlan_destroy $ul32 222
0168         vlan_destroy $ul32 111
0169         __simple_if_fini $ul32
0170         simple_if_fini $ul31 2001:Db8:83::2/64
0171 }
0172 
0173 sw4_create()
0174 {
0175         simple_if_init $ol4 192.0.4.1/24
0176         __simple_if_init $ul4 v$ol4 2001:db8:83::1/64
0177 
0178         tunnel_create g2 ip6gre 2001:db8:40::2 2001:db8:40::1 tos inherit dev v$ol4
0179         __simple_if_init g2 v$ol4 2001:db8:40::2/128
0180         ip -6 route add vrf v$ol4 2001:db8:40::1/128 via 2001:db8:83::2
0181 
0182         ip route add vrf v$ol4 192.0.3.0/24 nexthop dev g2
0183 }
0184 
0185 sw4_destroy()
0186 {
0187         ip route del vrf v$ol4 192.0.3.0/24
0188 
0189         ip -6 route del vrf v$ol4 2001:db8:40::1/128
0190         __simple_if_fini g2 2001:db8:40::2/128
0191         tunnel_destroy g2
0192 
0193         __simple_if_fini $ul4 2001:db8:83::1/64
0194         simple_if_fini $ol4 192.0.4.1/24
0195 }
0196 
0197 h2_create()
0198 {
0199         simple_if_init $h2 192.0.4.2/24
0200         ip route add vrf v$h2 192.0.3.0/24 via 192.0.4.1
0201 }
0202 
0203 h2_destroy()
0204 {
0205         ip route del vrf v$h2 192.0.3.0/24 via 192.0.4.1
0206         simple_if_fini $h2 192.0.4.2/24
0207 }
0208 
0209 setup_prepare()
0210 {
0211         h1=${NETIFS[p1]}
0212 
0213         ol1=${NETIFS[p2]}
0214         ul1=${NETIFS[p3]}
0215 
0216         ul21=${NETIFS[p4]}
0217         ul22=${NETIFS[p5]}
0218 
0219         ul32=${NETIFS[p6]}
0220         ul31=${NETIFS[p7]}
0221 
0222         ul4=${NETIFS[p8]}
0223         ol4=${NETIFS[p9]}
0224 
0225         h2=${NETIFS[p10]}
0226 
0227         vrf_prepare
0228         h1_create
0229         sw1_create
0230         sw2_create
0231         sw3_create
0232         sw4_create
0233         h2_create
0234 
0235         forwarding_enable
0236 }
0237 
0238 cleanup()
0239 {
0240         pre_cleanup
0241 
0242         forwarding_restore
0243 
0244         h2_destroy
0245         sw4_destroy
0246         sw3_destroy
0247         sw2_destroy
0248         sw1_destroy
0249         h1_destroy
0250         vrf_cleanup
0251 }
0252 
0253 multipath4_test()
0254 {
0255         local what=$1; shift
0256         local weight1=$1; shift
0257         local weight2=$1; shift
0258 
0259         sysctl_set net.ipv6.fib_multipath_hash_policy 2
0260         ip route replace vrf v$ul21 2001:db8:40::2/128 \
0261            nexthop via 2001:db8:81::2 weight $weight1 \
0262            nexthop via 2001:db8:82::2 weight $weight2
0263 
0264         local t0_111=$(tc_rule_stats_get $ul32 111 ingress)
0265         local t0_222=$(tc_rule_stats_get $ul32 222 ingress)
0266 
0267         ip vrf exec v$h1 \
0268            $MZ $h1 -q -p 64 -A "192.0.3.2-192.0.3.62" -B "192.0.4.2-192.0.4.62" \
0269                -d 1msec -c 50 -t udp "sp=1024,dp=1024"
0270         sleep 1
0271 
0272         local t1_111=$(tc_rule_stats_get $ul32 111 ingress)
0273         local t1_222=$(tc_rule_stats_get $ul32 222 ingress)
0274 
0275         local d111=$((t1_111 - t0_111))
0276         local d222=$((t1_222 - t0_222))
0277         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0278 
0279         ip route replace vrf v$ul21 2001:db8:40::2/128 \
0280            nexthop via 2001:db8:81::2 \
0281            nexthop via 2001:db8:82::2
0282         sysctl_restore net.ipv6.fib_multipath_hash_policy
0283 }
0284 
0285 ping_ipv4()
0286 {
0287         ping_test $h1 192.0.4.2
0288 }
0289 
0290 multipath_ipv4()
0291 {
0292         log_info "Running IPv4 over GRE over IPv6 multipath tests"
0293         multipath4_test "ECMP" 1 1
0294         multipath4_test "Weighted MP 2:1" 2 1
0295         multipath4_test "Weighted MP 11:45" 11 45
0296 }
0297 
0298 trap cleanup EXIT
0299 
0300 setup_prepare
0301 setup_wait
0302 tests_run
0303 
0304 exit $EXIT_STATUS
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