net/forwarding/gre_multipath.sh

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 # +-------------------|-----+
0012 #                     |
0013 # +-------------------|------------------------+
0014 # | SW1               |                        |
0015 # |              $ol1 +                        |
0016 # |      192.0.2.2/28                          |
0017 # |                                            |
0018 # |  + g1a (gre)          + g1b (gre)          |
0019 # |    loc=192.0.2.65       loc=192.0.2.81     |
0020 # |    rem=192.0.2.66 --.   rem=192.0.2.82 --. |
0021 # |    tos=inherit      |   tos=inherit      | |
0022 # |  .------------------'                    | |
0023 # |  |                    .------------------' |
0024 # |  v                    v                    |
0025 # |  + $ul1.111 (vlan)    + $ul1.222 (vlan)    |
0026 # |  | 192.0.2.129/28     | 192.0.2.145/28     |
0027 # |   \                  /                     |
0028 # |    \________________/                      |
0029 # |            |                               |
0030 # |            + $ul1                          |
0031 # +------------|-------------------------------+
0032 #              |
0033 # +------------|-------------------------------+
0034 # | SW2        + $ul2                          |
0035 # |     _______|________                       |
0036 # |    /                \                      |
0037 # |   /                  \                     |
0038 # |  + $ul2.111 (vlan)    + $ul2.222 (vlan)    |
0039 # |  ^ 192.0.2.130/28     ^ 192.0.2.146/28     |
0040 # |  |                    |                    |
0041 # |  |                    '------------------. |
0042 # |  '------------------.                    | |
0043 # |  + g2a (gre)        | + g2b (gre)        | |
0044 # |    loc=192.0.2.66   |   loc=192.0.2.82   | |
0045 # |    rem=192.0.2.65 --'   rem=192.0.2.81 --' |
0046 # |    tos=inherit          tos=inherit        |
0047 # |                                            |
0048 # |              $ol2 +                        |
0049 # |     192.0.2.17/28 |                        |
0050 # +-------------------|------------------------+
0051 #                     |
0052 # +-------------------|-----+
0053 # | H2                |     |
0054 # |               $h2 +     |
0055 # |     192.0.2.18/28       |
0056 # +-------------------------+
0057
0058 ALL_TESTS="
0059         ping_ipv4
0060         multipath_ipv4
0061 "
0062
0063 NUM_NETIFS=6
0064 source lib.sh
0065
0066 h1_create()
0067 {
0068         simple_if_init $h1 192.0.2.1/28 2001:db8:1::1/64
0069         ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2
0070 }
0071
0072 h1_destroy()
0073 {
0074         ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2
0075         simple_if_fini $h1 192.0.2.1/28
0076 }
0077
0078 sw1_create()
0079 {
0080         simple_if_init $ol1 192.0.2.2/28
0081         __simple_if_init $ul1 v$ol1
0082         vlan_create $ul1 111 v$ol1 192.0.2.129/28
0083         vlan_create $ul1 222 v$ol1 192.0.2.145/28
0084
0085         tunnel_create g1a gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1
0086         __simple_if_init g1a v$ol1 192.0.2.65/32
0087         ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130
0088
0089         tunnel_create g1b gre 192.0.2.81 192.0.2.82 tos inherit dev v$ol1
0090         __simple_if_init g1b v$ol1 192.0.2.81/32
0091         ip route add vrf v$ol1 192.0.2.82/32 via 192.0.2.146
0092
0093         ip route add vrf v$ol1 192.0.2.16/28 \
0094            nexthop dev g1a \
0095            nexthop dev g1b
0096 }
0097
0098 sw1_destroy()
0099 {
0100         ip route del vrf v$ol1 192.0.2.16/28
0101
0102         ip route del vrf v$ol1 192.0.2.82/32 via 192.0.2.146
0103         __simple_if_fini g1b 192.0.2.81/32
0104         tunnel_destroy g1b
0105
0106         ip route del vrf v$ol1 192.0.2.66/32 via 192.0.2.130
0107         __simple_if_fini g1a 192.0.2.65/32
0108         tunnel_destroy g1a
0109
0110         vlan_destroy $ul1 222
0111         vlan_destroy $ul1 111
0112         __simple_if_fini $ul1
0113         simple_if_fini $ol1 192.0.2.2/28
0114 }
0115
0116 sw2_create()
0117 {
0118         simple_if_init $ol2 192.0.2.17/28
0119         __simple_if_init $ul2 v$ol2
0120         vlan_create $ul2 111 v$ol2 192.0.2.130/28
0121         vlan_create $ul2 222 v$ol2 192.0.2.146/28
0122
0123         tunnel_create g2a gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol2
0124         __simple_if_init g2a v$ol2 192.0.2.66/32
0125         ip route add vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0126
0127         tunnel_create g2b gre 192.0.2.82 192.0.2.81 tos inherit dev v$ol2
0128         __simple_if_init g2b v$ol2 192.0.2.82/32
0129         ip route add vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0130
0131         ip route add vrf v$ol2 192.0.2.0/28 \
0132            nexthop dev g2a \
0133            nexthop dev g2b
0134
0135         tc qdisc add dev $ul2 clsact
0136         tc filter add dev $ul2 ingress pref 111 prot 802.1Q \
0137            flower vlan_id 111 action pass
0138         tc filter add dev $ul2 ingress pref 222 prot 802.1Q \
0139            flower vlan_id 222 action pass
0140 }
0141
0142 sw2_destroy()
0143 {
0144         tc qdisc del dev $ul2 clsact
0145
0146         ip route del vrf v$ol2 192.0.2.0/28
0147
0148         ip route del vrf v$ol2 192.0.2.81/32 via 192.0.2.145
0149         __simple_if_fini g2b 192.0.2.82/32
0150         tunnel_destroy g2b
0151
0152         ip route del vrf v$ol2 192.0.2.65/32 via 192.0.2.129
0153         __simple_if_fini g2a 192.0.2.66/32
0154         tunnel_destroy g2a
0155
0156         vlan_destroy $ul2 222
0157         vlan_destroy $ul2 111
0158         __simple_if_fini $ul2
0159         simple_if_fini $ol2 192.0.2.17/28
0160 }
0161
0162 h2_create()
0163 {
0164         simple_if_init $h2 192.0.2.18/28
0165         ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
0166 }
0167
0168 h2_destroy()
0169 {
0170         ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
0171         simple_if_fini $h2 192.0.2.18/28
0172 }
0173
0174 setup_prepare()
0175 {
0176         h1=${NETIFS[p1]}
0177         ol1=${NETIFS[p2]}
0178
0179         ul1=${NETIFS[p3]}
0180         ul2=${NETIFS[p4]}
0181
0182         ol2=${NETIFS[p5]}
0183         h2=${NETIFS[p6]}
0184
0185         vrf_prepare
0186         h1_create
0187         sw1_create
0188         sw2_create
0189         h2_create
0190
0191         forwarding_enable
0192 }
0193
0194 cleanup()
0195 {
0196         pre_cleanup
0197
0198         forwarding_restore
0199
0200         h2_destroy
0201         sw2_destroy
0202         sw1_destroy
0203         h1_destroy
0204         vrf_cleanup
0205 }
0206
0207 multipath4_test()
0208 {
0209         local what=$1; shift
0210         local weight1=$1; shift
0211         local weight2=$1; shift
0212
0213         sysctl_set net.ipv4.fib_multipath_hash_policy 1
0214         ip route replace vrf v$ol1 192.0.2.16/28 \
0215            nexthop dev g1a weight $weight1 \
0216            nexthop dev g1b weight $weight2
0217
0218         local t0_111=$(tc_rule_stats_get $ul2 111 ingress)
0219         local t0_222=$(tc_rule_stats_get $ul2 222 ingress)
0220
0221         ip vrf exec v$h1 \
0222            $MZ $h1 -q -p 64 -A 192.0.2.1 -B 192.0.2.18 \
0223                -d 1msec -t udp "sp=1024,dp=0-32768"
0224
0225         local t1_111=$(tc_rule_stats_get $ul2 111 ingress)
0226         local t1_222=$(tc_rule_stats_get $ul2 222 ingress)
0227
0228         local d111=$((t1_111 - t0_111))
0229         local d222=$((t1_222 - t0_222))
0230         multipath_eval "$what" $weight1 $weight2 $d111 $d222
0231
0232         ip route replace vrf v$ol1 192.0.2.16/28 \
0233            nexthop dev g1a \
0234            nexthop dev g1b
0235         sysctl_restore net.ipv4.fib_multipath_hash_policy
0236 }
0237
0238 ping_ipv4()
0239 {
0240         ping_test $h1 192.0.2.18
0241 }
0242
0243 multipath_ipv4()
0244 {
0245         log_info "Running IPv4 multipath tests"
0246         multipath4_test "ECMP" 1 1
0247         multipath4_test "Weighted MP 2:1" 2 1
0248         multipath4_test "Weighted MP 11:45" 11 45
0249 }
0250
0251 trap cleanup EXIT
0252
0253 setup_prepare
0254 setup_wait
0255 tests_run
0256
0257 exit $EXIT_STATUS