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 45ALL_TESTS=" 46 ping_ipv4 47 ping_ipv6 48 custom_hash 49" 50 51NUM_NETIFS=8 52source lib.sh 53 54h1_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 $h1 59} 60 61h1_destroy() 62{ 63 ip -6 route del vrf v$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 68sw1_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 $rp12 81} 82 83sw1_destroy() 84{ 85 ip -6 route del vrf v$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 94sw2_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 $rp22 107} 108 109sw2_destroy() 110{ 111 ip -6 route del vrf v$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 120h2_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 $h2 125} 126 127h2_destroy() 128{ 129 ip -6 route del vrf v$h2 default 130 ip route del vrf v$h2 default 131 simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64 132} 133 134setup_prepare() 135{ 136 h1=${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 159cleanup() 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 172ping_ipv4() 173{ 174 ping_test $h1 203.0.113.2 175} 176 177ping_ipv6() 178{ 179 ping6_test $h1 2001:db8:4::2 180} 181 182send_src_ipv4() 183{ 184 ip vrf exec v$h1 $MZ $h1 -q -p 64 \ 185 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \ 186 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000" 187} 188 189send_dst_ipv4() 190{ 191 ip vrf exec v$h1 $MZ $h1 -q -p 64 \ 192 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \ 193 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000" 194} 195 196send_src_udp4() 197{ 198 ip vrf exec v$h1 $MZ $h1 -q -p 64 \ 199 -A 198.51.100.2 -B 203.0.113.2 \ 200 -d $MZ_DELAY -t udp "sp=0-32768,dp=30000" 201} 202 203send_dst_udp4() 204{ 205 ip vrf exec v$h1 $MZ $h1 -q -p 64 \ 206 -A 198.51.100.2 -B 203.0.113.2 \ 207 -d $MZ_DELAY -t udp "sp=20000,dp=0-32768" 208} 209 210send_src_ipv6() 211{ 212 ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \ 213 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \ 214 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000" 215} 216 217send_dst_ipv6() 218{ 219 ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \ 220 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \ 221 -d $MZ_DELAY -c 50 -t udp "sp=20000,dp=30000" 222} 223 224send_flowlabel() 225{ 226 # Generate 16384 echo requests, each with a random flow label. 227 ip vrf exec v$h1 sh -c \ 228 "for _ in {1..16384}; do \ 229 $PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1; \ 230 done" 231} 232 233send_src_udp6() 234{ 235 ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \ 236 -A 2001:db8:1::2 -B 2001:db8:4::2 \ 237 -d $MZ_DELAY -t udp "sp=0-32768,dp=30000" 238} 239 240send_dst_udp6() 241{ 242 ip vrf exec v$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 247custom_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 280custom_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 315custom_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 354custom_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 366trap cleanup EXIT 367 368setup_prepare 369setup_wait 370tests_run 371 372exit $EXIT_STATUS 373