tools/testing/selftests/net/forwarding/custom_multipath_hash.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Test traffic distribution between two paths when using custom hash policy.
   5 #
   6 # +--------------------------------+
   7 # | H1                             |
   8 # |                     $h1 +      |
   9 # |   198.51.100.{2-253}/24 |      |
  10 # |   2001:db8:1::{2-fd}/64 |      |
  11 # +-------------------------|------+
  12 #                           |
  13 # +-------------------------|-------------------------+
  14 # | SW1                     |                         |
  15 # |                    $rp1 +                         |
  16 # |         198.51.100.1/24                           |
  17 # |        2001:db8:1::1/64                           |
  18 # |                                                   |
  19 # |                                                   |
  20 # |            $rp11 +             + $rp12            |
  21 # |     192.0.2.1/28 |             | 192.0.2.17/28    |
  22 # | 2001:db8:2::1/64 |             | 2001:db8:3::1/64 |
  23 # +------------------|-------------|------------------+
  24 #                    |             |
  25 # +------------------|-------------|------------------+
  26 # | SW2              |             |                  |
  27 # |                  |             |                  |
  28 # |            $rp21 +             + $rp22            |
  29 # |     192.0.2.2/28                 192.0.2.18/28    |
  30 # | 2001:db8:2::2/64                 2001:db8:3::2/64 |
  31 # |                                                   |
  32 # |                                                   |
  33 # |                    $rp2 +                         |
  34 # |          203.0.113.1/24 |                         |
  35 # |        2001:db8:4::1/64 |                         |
  36 # +-------------------------|-------------------------+
  37 #                           |
  38 # +-------------------------|------+
  39 # | H2                      |      |
  40 # |                     $h2 +      |
  41 # |    203.0.113.{2-253}/24        |
  42 # |   2001:db8:4::{2-fd}/64        |
  43 # +--------------------------------+
  44
  45 ALL_TESTS="
  46         ping_ipv4
  47         ping_ipv6
  48         custom_hash
  49 "
  50
  51 NUM_NETIFS=8
  52 source lib.sh
  53
  54 h1_create()
  55 {
  56         simple_if_init $h1 198.51.100.2/24 2001:db8:1::2/64
  57         ip route add vrf v$h1 default via 198.51.100.1 dev $h1
  58         ip -6 route add vrf v$h1 default via 2001:db8:1::1 dev $h1
  59 }
  60
  61 h1_destroy()
  62 {
  63         ip -6 route del vrf v$h1 default
  64         ip route del vrf v$h1 default
  65         simple_if_fini $h1 198.51.100.2/24 2001:db8:1::2/64
  66 }
  67
  68 sw1_create()
  69 {
  70         simple_if_init $rp1 198.51.100.1/24 2001:db8:1::1/64
  71         __simple_if_init $rp11 v$rp1 192.0.2.1/28 2001:db8:2::1/64
  72         __simple_if_init $rp12 v$rp1 192.0.2.17/28 2001:db8:3::1/64
  73
  74         ip route add vrf v$rp1 203.0.113.0/24 \
  75                 nexthop via 192.0.2.2 dev $rp11 \
  76                 nexthop via 192.0.2.18 dev $rp12
  77
  78         ip -6 route add vrf v$rp1 2001:db8:4::/64 \
  79                 nexthop via 2001:db8:2::2 dev $rp11 \
  80                 nexthop via 2001:db8:3::2 dev $rp12
  81 }
  82
  83 sw1_destroy()
  84 {
  85         ip -6 route del vrf v$rp1 2001:db8:4::/64
  86
  87         ip route del vrf v$rp1 203.0.113.0/24
  88
  89         __simple_if_fini $rp12 192.0.2.17/28 2001:db8:3::1/64
  90         __simple_if_fini $rp11 192.0.2.1/28 2001:db8:2::1/64
  91         simple_if_fini $rp1 198.51.100.1/24 2001:db8:1::1/64
  92 }
  93
  94 sw2_create()
  95 {
  96         simple_if_init $rp2 203.0.113.1/24 2001:db8:4::1/64
  97         __simple_if_init $rp21 v$rp2 192.0.2.2/28 2001:db8:2::2/64
  98         __simple_if_init $rp22 v$rp2 192.0.2.18/28 2001:db8:3::2/64
  99
 100         ip route add vrf v$rp2 198.51.100.0/24 \
 101                 nexthop via 192.0.2.1 dev $rp21 \
 102                 nexthop via 192.0.2.17 dev $rp22
 103
 104         ip -6 route add vrf v$rp2 2001:db8:1::/64 \
 105                 nexthop via 2001:db8:2::1 dev $rp21 \
 106                 nexthop via 2001:db8:3::1 dev $rp22
 107 }
 108
 109 sw2_destroy()
 110 {
 111         ip -6 route del vrf v$rp2 2001:db8:1::/64
 112
 113         ip route del vrf v$rp2 198.51.100.0/24
 114
 115         __simple_if_fini $rp22 192.0.2.18/28 2001:db8:3::2/64
 116         __simple_if_fini $rp21 192.0.2.2/28 2001:db8:2::2/64
 117         simple_if_fini $rp2 203.0.113.1/24 2001:db8:4::1/64
 118 }
 119
 120 h2_create()
 121 {
 122         simple_if_init $h2 203.0.113.2/24 2001:db8:4::2/64
 123         ip route add vrf v$h2 default via 203.0.113.1 dev $h2
 124         ip -6 route add vrf v$h2 default via 2001:db8:4::1 dev $h2
 125 }
 126
 127 h2_destroy()
 128 {
 129         ip -6 route del vrf v$h2 default
 130         ip route del vrf v$h2 default
 131         simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64
 132 }
 133
 134 setup_prepare()
 135 {
 136         h1=${NETIFS[p1]}
 137
 138         rp1=${NETIFS[p2]}
 139
 140         rp11=${NETIFS[p3]}
 141         rp21=${NETIFS[p4]}
 142
 143         rp12=${NETIFS[p5]}
 144         rp22=${NETIFS[p6]}
 145
 146         rp2=${NETIFS[p7]}
 147
 148         h2=${NETIFS[p8]}
 149
 150         vrf_prepare
 151         h1_create
 152         sw1_create
 153         sw2_create
 154         h2_create
 155
 156         forwarding_enable
 157 }
 158
 159 cleanup()
 160 {
 161         pre_cleanup
 162
 163         forwarding_restore
 164
 165         h2_destroy
 166         sw2_destroy
 167         sw1_destroy
 168         h1_destroy
 169         vrf_cleanup
 170 }
 171
 172 ping_ipv4()
 173 {
 174         ping_test $h1 203.0.113.2
 175 }
 176
 177 ping_ipv6()
 178 {
 179         ping6_test $h1 2001:db8:4::2
 180 }
 181
 182 send_src_ipv4()
 183 {
 184         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
 185                 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
 186                 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000"
 187 }
 188
 189 send_dst_ipv4()
 190 {
 191         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
 192                 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
 193                 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000"
 194 }
 195
 196 send_src_udp4()
 197 {
 198         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
 199                 -A 198.51.100.2 -B 203.0.113.2 \
 200                 -d $MZ_DELAY -t udp "sp=0-32768,dp=30000"
 201 }
 202
 203 send_dst_udp4()
 204 {
 205         ip vrf exec v$h1 $MZ $h1 -q -p 64 \
 206                 -A 198.51.100.2 -B 203.0.113.2 \
 207                 -d $MZ_DELAY -t udp "sp=20000,dp=0-32768"
 208 }
 209
 210 send_src_ipv6()
 211 {
 212         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
 213                 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
 214                 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000"
 215 }
 216
 217 send_dst_ipv6()
 218 {
 219         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
 220                 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
 221                 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000"
 222 }
 223
 224 send_flowlabel()
 225 {
 226         # Generate 16384 echo requests, each with a random flow label.
 227         for _ in $(seq 1 16384); do
 228                 ip vrf exec v$h1 \
 229                         $PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
 230         done
 231 }
 232
 233 send_src_udp6()
 234 {
 235         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
 236                 -A 2001:db8:1::2 -B 2001:db8:4::2 \
 237                 -d $MZ_DELAY -t udp "sp=0-32768,dp=30000"
 238 }
 239
 240 send_dst_udp6()
 241 {
 242         ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
 243                 -A 2001:db8:1::2 -B 2001:db8:4::2 \
 244                 -d $MZ_DELAY -t udp "sp=20000,dp=0-32768"
 245 }
 246
 247 custom_hash_test()
 248 {
 249         local field="$1"; shift
 250         local balanced="$1"; shift
 251         local send_flows="$@"
 252
 253         RET=0
 254
 255         local t0_rp11=$(link_stats_tx_packets_get $rp11)
 256         local t0_rp12=$(link_stats_tx_packets_get $rp12)
 257
 258         $send_flows
 259
 260         local t1_rp11=$(link_stats_tx_packets_get $rp11)
 261         local t1_rp12=$(link_stats_tx_packets_get $rp12)
 262
 263         local d_rp11=$((t1_rp11 - t0_rp11))
 264         local d_rp12=$((t1_rp12 - t0_rp12))
 265
 266         local diff=$((d_rp12 - d_rp11))
 267         local sum=$((d_rp11 + d_rp12))
 268
 269         local pct=$(echo "$diff / $sum * 100" | bc -l)
 270         local is_balanced=$(echo "-20 <= $pct && $pct <= 20" | bc)
 271
 272         [[ ( $is_balanced -eq 1 && $balanced == "balanced" ) ||
 273            ( $is_balanced -eq 0 && $balanced == "unbalanced" ) ]]
 274         check_err $? "Expected traffic to be $balanced, but it is not"
 275
 276         log_test "Multipath hash field: $field ($balanced)"
 277         log_info "Packets sent on path1 / path2: $d_rp11 / $d_rp12"
 278 }
 279
 280 custom_hash_v4()
 281 {
 282         log_info "Running IPv4 custom multipath hash tests"
 283
 284         sysctl_set net.ipv4.fib_multipath_hash_policy 3
 285
 286         # Prevent the neighbour table from overflowing, as different neighbour
 287         # entries will be created on $ol4 when using different destination IPs.
 288         sysctl_set net.ipv4.neigh.default.gc_thresh1 1024
 289         sysctl_set net.ipv4.neigh.default.gc_thresh2 1024
 290         sysctl_set net.ipv4.neigh.default.gc_thresh3 1024
 291
 292         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0001
 293         custom_hash_test "Source IP" "balanced" send_src_ipv4
 294         custom_hash_test "Source IP" "unbalanced" send_dst_ipv4
 295
 296         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0002
 297         custom_hash_test "Destination IP" "balanced" send_dst_ipv4
 298         custom_hash_test "Destination IP" "unbalanced" send_src_ipv4
 299
 300         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0010
 301         custom_hash_test "Source port" "balanced" send_src_udp4
 302         custom_hash_test "Source port" "unbalanced" send_dst_udp4
 303
 304         sysctl_set net.ipv4.fib_multipath_hash_fields 0x0020
 305         custom_hash_test "Destination port" "balanced" send_dst_udp4
 306         custom_hash_test "Destination port" "unbalanced" send_src_udp4
 307
 308         sysctl_restore net.ipv4.neigh.default.gc_thresh3
 309         sysctl_restore net.ipv4.neigh.default.gc_thresh2
 310         sysctl_restore net.ipv4.neigh.default.gc_thresh1
 311
 312         sysctl_restore net.ipv4.fib_multipath_hash_policy
 313 }
 314
 315 custom_hash_v6()
 316 {
 317         log_info "Running IPv6 custom multipath hash tests"
 318
 319         sysctl_set net.ipv6.fib_multipath_hash_policy 3
 320
 321         # Prevent the neighbour table from overflowing, as different neighbour
 322         # entries will be created on $ol4 when using different destination IPs.
 323         sysctl_set net.ipv6.neigh.default.gc_thresh1 1024
 324         sysctl_set net.ipv6.neigh.default.gc_thresh2 1024
 325         sysctl_set net.ipv6.neigh.default.gc_thresh3 1024
 326
 327         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0001
 328         custom_hash_test "Source IP" "balanced" send_src_ipv6
 329         custom_hash_test "Source IP" "unbalanced" send_dst_ipv6
 330
 331         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0002
 332         custom_hash_test "Destination IP" "balanced" send_dst_ipv6
 333         custom_hash_test "Destination IP" "unbalanced" send_src_ipv6
 334
 335         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0008
 336         custom_hash_test "Flowlabel" "balanced" send_flowlabel
 337         custom_hash_test "Flowlabel" "unbalanced" send_src_ipv6
 338
 339         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0010
 340         custom_hash_test "Source port" "balanced" send_src_udp6
 341         custom_hash_test "Source port" "unbalanced" send_dst_udp6
 342
 343         sysctl_set net.ipv6.fib_multipath_hash_fields 0x0020
 344         custom_hash_test "Destination port" "balanced" send_dst_udp6
 345         custom_hash_test "Destination port" "unbalanced" send_src_udp6
 346
 347         sysctl_restore net.ipv6.neigh.default.gc_thresh3
 348         sysctl_restore net.ipv6.neigh.default.gc_thresh2
 349         sysctl_restore net.ipv6.neigh.default.gc_thresh1
 350
 351         sysctl_restore net.ipv6.fib_multipath_hash_policy
 352 }
 353
 354 custom_hash()
 355 {
 356         # Test that when the hash policy is set to custom, traffic is
 357         # distributed only according to the fields set in the
 358         # fib_multipath_hash_fields sysctl.
 359         #
 360         # Each time set a different field and make sure traffic is only
 361         # distributed when the field is changed in the packet stream.
 362         custom_hash_v4
 363         custom_hash_v6
 364 }
 365
 366 trap cleanup EXIT
 367
 368 setup_prepare
 369 setup_wait
 370 tests_run
 371
 372 exit $EXIT_STATUS