#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # Test traffic distribution when there are multiple routes between an IPv4 # GRE tunnel. The tunnel carries IPv4 traffic between multiple hosts. # Multiple routes are in the underlay network. With the default multipath # policy, SW2 will only look at the outer IP addresses, hence only a single # route would be used. # # +-------------------------+ # | H1 | # | $h1 + | # | 192.0.3.{2-62}/24 | | # +-------------------|-----+ # | # +-------------------|------------------------+ # | SW1 | | # | $ol1 + | # | 192.0.3.1/24 | # | | # | + g1 (gre) | # | loc=192.0.2.65 | # | rem=192.0.2.66 --. | # | tos=inherit | | # | v | # | + $ul1 | # | | 192.0.2.129/28 | # +---------------------|----------------------+ # | # +---------------------|----------------------+ # | SW2 | | # | $ul21 + | # | 192.0.2.130/28 | # | | | # ! ________________|_____ | # | / \ | # | | | | # | + $ul22.111 (vlan) + $ul22.222 (vlan) | # | | 192.0.2.145/28 | 192.0.2.161/28 | # | | | | # +--|----------------------|------------------+ # | | # +--|----------------------|------------------+ # | | | | # | + $ul32.111 (vlan) + $ul32.222 (vlan) | # | | 192.0.2.146/28 | 192.0.2.162/28 | # | | | | # | \______________________/ | # | | | # | | | # | $ul31 + | # | 192.0.2.177/28 | SW3 | # +---------------------|----------------------+ # | # +---------------------|----------------------+ # | + $ul4 | # | ^ 192.0.2.178/28 | # | | | # | + g2 (gre) | | # | loc=192.0.2.66 | | # | rem=192.0.2.65 --' | # | tos=inherit | # | | # | $ol4 + | # | 192.0.4.1/24 | SW4 | # +--------------------|-----------------------+ # | # +--------------------|---------+ # | | | # | $h2 + | # | 192.0.4.{2-62}/24 H2 | # +------------------------------+ ALL_TESTS=" ping_ipv4 multipath_ipv4 " NUM_NETIFS=10 source lib.sh h1_create() { simple_if_init $h1 192.0.3.2/24 ip route add vrf v$h1 192.0.4.0/24 via 192.0.3.1 } h1_destroy() { ip route del vrf v$h1 192.0.4.0/24 via 192.0.3.1 simple_if_fini $h1 192.0.3.2/24 } sw1_create() { simple_if_init $ol1 192.0.3.1/24 __simple_if_init $ul1 v$ol1 192.0.2.129/28 tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1 __simple_if_init g1 v$ol1 192.0.2.65/32 ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130 ip route add vrf v$ol1 192.0.4.0/24 nexthop dev g1 } sw1_destroy() { ip route del vrf v$ol1 192.0.4.0/24 ip route del vrf v$ol1 192.0.2.66/32 __simple_if_fini g1 192.0.2.65/32 tunnel_destroy g1 __simple_if_fini $ul1 192.0.2.129/28 simple_if_fini $ol1 192.0.3.1/24 } sw2_create() { simple_if_init $ul21 192.0.2.130/28 __simple_if_init $ul22 v$ul21 vlan_create $ul22 111 v$ul21 192.0.2.145/28 vlan_create $ul22 222 v$ul21 192.0.2.161/28 ip route add vrf v$ul21 192.0.2.65/32 via 192.0.2.129 ip route add vrf v$ul21 192.0.2.66/32 \ nexthop via 192.0.2.146 \ nexthop via 192.0.2.162 } sw2_destroy() { ip route del vrf v$ul21 192.0.2.66/32 ip route del vrf v$ul21 192.0.2.65/32 vlan_destroy $ul22 222 vlan_destroy $ul22 111 __simple_if_fini $ul22 simple_if_fini $ul21 192.0.2.130/28 } sw3_create() { simple_if_init $ul31 192.0.2.177/28 __simple_if_init $ul32 v$ul31 vlan_create $ul32 111 v$ul31 192.0.2.146/28 vlan_create $ul32 222 v$ul31 192.0.2.162/28 ip route add vrf v$ul31 192.0.2.66/32 via 192.0.2.178 ip route add vrf v$ul31 192.0.2.65/32 \ nexthop via 192.0.2.145 \ nexthop via 192.0.2.161 tc qdisc add dev $ul32 clsact tc filter add dev $ul32 ingress pref 111 prot 802.1Q \ flower vlan_id 111 action pass tc filter add dev $ul32 ingress pref 222 prot 802.1Q \ flower vlan_id 222 action pass } sw3_destroy() { tc qdisc del dev $ul32 clsact ip route del vrf v$ul31 192.0.2.65/32 ip route del vrf v$ul31 192.0.2.66/32 vlan_destroy $ul32 222 vlan_destroy $ul32 111 __simple_if_fini $ul32 simple_if_fini $ul31 192.0.2.177/28 } sw4_create() { simple_if_init $ol4 192.0.4.1/24 __simple_if_init $ul4 v$ol4 192.0.2.178/28 tunnel_create g2 gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol4 __simple_if_init g2 v$ol4 192.0.2.66/32 ip route add vrf v$ol4 192.0.2.65/32 via 192.0.2.177 ip route add vrf v$ol4 192.0.3.0/24 nexthop dev g2 } sw4_destroy() { ip route del vrf v$ol4 192.0.3.0/24 ip route del vrf v$ol4 192.0.2.65/32 __simple_if_fini g2 192.0.2.66/32 tunnel_destroy g2 __simple_if_fini $ul4 192.0.2.178/28 simple_if_fini $ol4 192.0.4.1/24 } h2_create() { simple_if_init $h2 192.0.4.2/24 ip route add vrf v$h2 192.0.3.0/24 via 192.0.4.1 } h2_destroy() { ip route del vrf v$h2 192.0.3.0/24 via 192.0.4.1 simple_if_fini $h2 192.0.4.2/24 } setup_prepare() { h1=${NETIFS[p1]} ol1=${NETIFS[p2]} ul1=${NETIFS[p3]} ul21=${NETIFS[p4]} ul22=${NETIFS[p5]} ul32=${NETIFS[p6]} ul31=${NETIFS[p7]} ul4=${NETIFS[p8]} ol4=${NETIFS[p9]} h2=${NETIFS[p10]} vrf_prepare h1_create sw1_create sw2_create sw3_create sw4_create h2_create forwarding_enable } cleanup() { pre_cleanup forwarding_restore h2_destroy sw4_destroy sw3_destroy sw2_destroy sw1_destroy h1_destroy vrf_cleanup } multipath4_test() { local what=$1; shift local weight1=$1; shift local weight2=$1; shift sysctl_set net.ipv4.fib_multipath_hash_policy 2 ip route replace vrf v$ul21 192.0.2.66/32 \ nexthop via 192.0.2.146 weight $weight1 \ nexthop via 192.0.2.162 weight $weight2 local t0_111=$(tc_rule_stats_get $ul32 111 ingress) local t0_222=$(tc_rule_stats_get $ul32 222 ingress) ip vrf exec v$h1 \ $MZ $h1 -q -p 64 -A "192.0.3.2-192.0.3.62" -B "192.0.4.2-192.0.4.62" \ -d $MZ_DELAY -c 50 -t udp "sp=1024,dp=1024" sleep 1 local t1_111=$(tc_rule_stats_get $ul32 111 ingress) local t1_222=$(tc_rule_stats_get $ul32 222 ingress) local d111=$((t1_111 - t0_111)) local d222=$((t1_222 - t0_222)) multipath_eval "$what" $weight1 $weight2 $d111 $d222 ip route replace vrf v$ul21 192.0.2.66/32 \ nexthop via 192.0.2.146 \ nexthop via 192.0.2.162 sysctl_restore net.ipv4.fib_multipath_hash_policy } ping_ipv4() { ping_test $h1 192.0.4.2 } multipath_ipv4() { log_info "Running IPv4 over GRE over IPv4 multipath tests" multipath4_test "ECMP" 1 1 multipath4_test "Weighted MP 2:1" 2 1 multipath4_test "Weighted MP 11:45" 11 45 } trap cleanup EXIT setup_prepare setup_wait tests_run exit $EXIT_STATUS