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0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0
0003 #
0004 # Test traffic distribution between two paths when using custom hash policy.
0005 #
0006 # +--------------------------------+
0007 # | H1                             |
0008 # |                     $h1 +      |
0009 # |   198.51.100.{2-253}/24 |      |
0010 # |   2001:db8:1::{2-fd}/64 |      |
0011 # +-------------------------|------+
0012 #                           |
0013 # +-------------------------|-------------------------+
0014 # | SW1                     |                         |
0015 # |                    $rp1 +                         |
0016 # |         198.51.100.1/24                           |
0017 # |        2001:db8:1::1/64                           |
0018 # |                                                   |
0019 # |                                                   |
0020 # |            $rp11 +             + $rp12            |
0021 # |     192.0.2.1/28 |             | 192.0.2.17/28    |
0022 # | 2001:db8:2::1/64 |             | 2001:db8:3::1/64 |
0023 # +------------------|-------------|------------------+
0024 #                    |             |
0025 # +------------------|-------------|------------------+
0026 # | SW2              |             |                  |
0027 # |                  |             |                  |
0028 # |            $rp21 +             + $rp22            |
0029 # |     192.0.2.2/28                 192.0.2.18/28    |
0030 # | 2001:db8:2::2/64                 2001:db8:3::2/64 |
0031 # |                                                   |
0032 # |                                                   |
0033 # |                    $rp2 +                         |
0034 # |          203.0.113.1/24 |                         |
0035 # |        2001:db8:4::1/64 |                         |
0036 # +-------------------------|-------------------------+
0037 #                           |
0038 # +-------------------------|------+
0039 # | H2                      |      |
0040 # |                     $h2 +      |
0041 # |    203.0.113.{2-253}/24        |
0042 # |   2001:db8:4::{2-fd}/64        |
0043 # +--------------------------------+
0044 
0045 ALL_TESTS="
0046         ping_ipv4
0047         ping_ipv6
0048         custom_hash
0049 "
0050 
0051 NUM_NETIFS=8
0052 source lib.sh
0053 
0054 h1_create()
0055 {
0056         simple_if_init $h1 198.51.100.2/24 2001:db8:1::2/64
0057         ip route add vrf v$h1 default via 198.51.100.1 dev $h1
0058         ip -6 route add vrf v$h1 default via 2001:db8:1::1 dev $h1
0059 }
0060 
0061 h1_destroy()
0062 {
0063         ip -6 route del vrf v$h1 default
0064         ip route del vrf v$h1 default
0065         simple_if_fini $h1 198.51.100.2/24 2001:db8:1::2/64
0066 }
0067 
0068 sw1_create()
0069 {
0070         simple_if_init $rp1 198.51.100.1/24 2001:db8:1::1/64
0071         __simple_if_init $rp11 v$rp1 192.0.2.1/28 2001:db8:2::1/64
0072         __simple_if_init $rp12 v$rp1 192.0.2.17/28 2001:db8:3::1/64
0073 
0074         ip route add vrf v$rp1 203.0.113.0/24 \
0075                 nexthop via 192.0.2.2 dev $rp11 \
0076                 nexthop via 192.0.2.18 dev $rp12
0077 
0078         ip -6 route add vrf v$rp1 2001:db8:4::/64 \
0079                 nexthop via 2001:db8:2::2 dev $rp11 \
0080                 nexthop via 2001:db8:3::2 dev $rp12
0081 }
0082 
0083 sw1_destroy()
0084 {
0085         ip -6 route del vrf v$rp1 2001:db8:4::/64
0086 
0087         ip route del vrf v$rp1 203.0.113.0/24
0088 
0089         __simple_if_fini $rp12 192.0.2.17/28 2001:db8:3::1/64
0090         __simple_if_fini $rp11 192.0.2.1/28 2001:db8:2::1/64
0091         simple_if_fini $rp1 198.51.100.1/24 2001:db8:1::1/64
0092 }
0093 
0094 sw2_create()
0095 {
0096         simple_if_init $rp2 203.0.113.1/24 2001:db8:4::1/64
0097         __simple_if_init $rp21 v$rp2 192.0.2.2/28 2001:db8:2::2/64
0098         __simple_if_init $rp22 v$rp2 192.0.2.18/28 2001:db8:3::2/64
0099 
0100         ip route add vrf v$rp2 198.51.100.0/24 \
0101                 nexthop via 192.0.2.1 dev $rp21 \
0102                 nexthop via 192.0.2.17 dev $rp22
0103 
0104         ip -6 route add vrf v$rp2 2001:db8:1::/64 \
0105                 nexthop via 2001:db8:2::1 dev $rp21 \
0106                 nexthop via 2001:db8:3::1 dev $rp22
0107 }
0108 
0109 sw2_destroy()
0110 {
0111         ip -6 route del vrf v$rp2 2001:db8:1::/64
0112 
0113         ip route del vrf v$rp2 198.51.100.0/24
0114 
0115         __simple_if_fini $rp22 192.0.2.18/28 2001:db8:3::2/64
0116         __simple_if_fini $rp21 192.0.2.2/28 2001:db8:2::2/64
0117         simple_if_fini $rp2 203.0.113.1/24 2001:db8:4::1/64
0118 }
0119 
0120 h2_create()
0121 {
0122         simple_if_init $h2 203.0.113.2/24 2001:db8:4::2/64
0123         ip route add vrf v$h2 default via 203.0.113.1 dev $h2
0124         ip -6 route add vrf v$h2 default via 2001:db8:4::1 dev $h2
0125 }
0126 
0127 h2_destroy()
0128 {
0129         ip -6 route del vrf v$h2 default
0130         ip route del vrf v$h2 default
0131         simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64
0132 }
0133 
0134 setup_prepare()
0135 {
0136         h1=${NETIFS[p1]}
0137 
0138         rp1=${NETIFS[p2]}
0139 
0140         rp11=${NETIFS[p3]}
0141         rp21=${NETIFS[p4]}
0142 
0143         rp12=${NETIFS[p5]}
0144         rp22=${NETIFS[p6]}
0145 
0146         rp2=${NETIFS[p7]}
0147 
0148         h2=${NETIFS[p8]}
0149 
0150         vrf_prepare
0151         h1_create
0152         sw1_create
0153         sw2_create
0154         h2_create
0155 
0156         forwarding_enable
0157 }
0158 
0159 cleanup()
0160 {
0161         pre_cleanup
0162 
0163         forwarding_restore
0164 
0165         h2_destroy
0166         sw2_destroy
0167         sw1_destroy
0168         h1_destroy
0169         vrf_cleanup
0170 }
0171 
0172 ping_ipv4()
0173 {
0174         ping_test $h1 203.0.113.2
0175 }
0176 
0177 ping_ipv6()
0178 {
0179         ping6_test $h1 2001:db8:4::2
0180 }
0181 
0182 send_src_ipv4()
0183 {
0184         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
0185                 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
0186                 -d 1msec -c 50 -t udp "sp=20000,dp=30000"
0187 }
0188 
0189 send_dst_ipv4()
0190 {
0191         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
0192                 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
0193                 -d 1msec -c 50 -t udp "sp=20000,dp=30000"
0194 }
0195 
0196 send_src_udp4()
0197 {
0198         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
0199                 -A 198.51.100.2 -B 203.0.113.2 \
0200                 -d 1msec -t udp "sp=0-32768,dp=30000"
0201 }
0202 
0203 send_dst_udp4()
0204 {
0205         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
0206                 -A 198.51.100.2 -B 203.0.113.2 \
0207                 -d 1msec -t udp "sp=20000,dp=0-32768"
0208 }
0209 
0210 send_src_ipv6()
0211 {
0212         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
0213                 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
0214                 -d 1msec -c 50 -t udp "sp=20000,dp=30000"
0215 }
0216 
0217 send_dst_ipv6()
0218 {
0219         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
0220                 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
0221                 -d 1msec -c 50 -t udp "sp=20000,dp=30000"
0222 }
0223 
0224 send_flowlabel()
0225 {
0226         # Generate 16384 echo requests, each with a random flow label.
0227         for _ in $(seq 1 16384); do
0228                 ip vrf exec v$h1 \
0229                         $PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
0230         done
0231 }
0232 
0233 send_src_udp6()
0234 {
0235         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
0236                 -A 2001:db8:1::2 -B 2001:db8:4::2 \
0237                 -d 1msec -t udp "sp=0-32768,dp=30000"
0238 }
0239 
0240 send_dst_udp6()
0241 {
0242         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
0243                 -A 2001:db8:1::2 -B 2001:db8:4::2 \
0244                 -d 1msec -t udp "sp=20000,dp=0-32768"
0245 }
0246 
0247 custom_hash_test()
0248 {
0249         local field="$1"; shift
0250         local balanced="$1"; shift
0251         local send_flows="$@"
0252 
0253         RET=0
0254 
0255         local t0_rp11=$(link_stats_tx_packets_get $rp11)
0256         local t0_rp12=$(link_stats_tx_packets_get $rp12)
0257 
0258         $send_flows
0259 
0260         local t1_rp11=$(link_stats_tx_packets_get $rp11)
0261         local t1_rp12=$(link_stats_tx_packets_get $rp12)
0262 
0263         local d_rp11=$((t1_rp11 - t0_rp11))
0264         local d_rp12=$((t1_rp12 - t0_rp12))
0265 
0266         local diff=$((d_rp12 - d_rp11))
0267         local sum=$((d_rp11 + d_rp12))
0268 
0269         local pct=$(echo "$diff / $sum * 100" | bc -l)
0270         local is_balanced=$(echo "-20 <= $pct && $pct <= 20" | bc)
0271 
0272         [[ ( $is_balanced -eq 1 && $balanced == "balanced" ) ||
0273            ( $is_balanced -eq 0 && $balanced == "unbalanced" ) ]]
0274         check_err $? "Expected traffic to be $balanced, but it is not"
0275 
0276         log_test "Multipath hash field: $field ($balanced)"
0277         log_info "Packets sent on path1 / path2: $d_rp11 / $d_rp12"
0278 }
0279 
0280 custom_hash_v4()
0281 {
0282         log_info "Running IPv4 custom multipath hash tests"
0283 
0284         sysctl_set net.ipv4.fib_multipath_hash_policy 3
0285 
0286         # Prevent the neighbour table from overflowing, as different neighbour
0287         # entries will be created on $ol4 when using different destination IPs.
0288         sysctl_set net.ipv4.neigh.default.gc_thresh1 1024
0289         sysctl_set net.ipv4.neigh.default.gc_thresh2 1024
0290         sysctl_set net.ipv4.neigh.default.gc_thresh3 1024
0291 
0292         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0001
0293         custom_hash_test "Source IP" "balanced" send_src_ipv4
0294         custom_hash_test "Source IP" "unbalanced" send_dst_ipv4
0295 
0296         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0002
0297         custom_hash_test "Destination IP" "balanced" send_dst_ipv4
0298         custom_hash_test "Destination IP" "unbalanced" send_src_ipv4
0299 
0300         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0010
0301         custom_hash_test "Source port" "balanced" send_src_udp4
0302         custom_hash_test "Source port" "unbalanced" send_dst_udp4
0303 
0304         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0020
0305         custom_hash_test "Destination port" "balanced" send_dst_udp4
0306         custom_hash_test "Destination port" "unbalanced" send_src_udp4
0307 
0308         sysctl_restore net.ipv4.neigh.default.gc_thresh3
0309         sysctl_restore net.ipv4.neigh.default.gc_thresh2
0310         sysctl_restore net.ipv4.neigh.default.gc_thresh1
0311 
0312         sysctl_restore net.ipv4.fib_multipath_hash_policy
0313 }
0314 
0315 custom_hash_v6()
0316 {
0317         log_info "Running IPv6 custom multipath hash tests"
0318 
0319         sysctl_set net.ipv6.fib_multipath_hash_policy 3
0320 
0321         # Prevent the neighbour table from overflowing, as different neighbour
0322         # entries will be created on $ol4 when using different destination IPs.
0323         sysctl_set net.ipv6.neigh.default.gc_thresh1 1024
0324         sysctl_set net.ipv6.neigh.default.gc_thresh2 1024
0325         sysctl_set net.ipv6.neigh.default.gc_thresh3 1024
0326 
0327         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0001
0328         custom_hash_test "Source IP" "balanced" send_src_ipv6
0329         custom_hash_test "Source IP" "unbalanced" send_dst_ipv6
0330 
0331         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0002
0332         custom_hash_test "Destination IP" "balanced" send_dst_ipv6
0333         custom_hash_test "Destination IP" "unbalanced" send_src_ipv6
0334 
0335         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0008
0336         custom_hash_test "Flowlabel" "balanced" send_flowlabel
0337         custom_hash_test "Flowlabel" "unbalanced" send_src_ipv6
0338 
0339         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0010
0340         custom_hash_test "Source port" "balanced" send_src_udp6
0341         custom_hash_test "Source port" "unbalanced" send_dst_udp6
0342 
0343         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0020
0344         custom_hash_test "Destination port" "balanced" send_dst_udp6
0345         custom_hash_test "Destination port" "unbalanced" send_src_udp6
0346 
0347         sysctl_restore net.ipv6.neigh.default.gc_thresh3
0348         sysctl_restore net.ipv6.neigh.default.gc_thresh2
0349         sysctl_restore net.ipv6.neigh.default.gc_thresh1
0350 
0351         sysctl_restore net.ipv6.fib_multipath_hash_policy
0352 }
0353 
0354 custom_hash()
0355 {
0356         # Test that when the hash policy is set to custom, traffic is
0357         # distributed only according to the fields set in the
0358         # fib_multipath_hash_fields sysctl.
0359         #
0360         # Each time set a different field and make sure traffic is only
0361         # distributed when the field is changed in the packet stream.
0362         custom_hash_v4
0363         custom_hash_v6
0364 }
0365 
0366 trap cleanup EXIT
0367 
0368 setup_prepare
0369 setup_wait
0370 tests_run
0371 
0372 exit $EXIT_STATUS
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