name : gre_multipath.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # Test traffic distribution when a wECMP route forwards traffic to two GRE # tunnels. # # +-------------------------+ # | H1 | # | $h1 + | # | 192.0.2.1/28 | | # +-------------------|-----+ # | # +-------------------|------------------------+ # | SW1 | | # | $ol1 + | # | 192.0.2.2/28 | # | | # | + g1a (gre) + g1b (gre) | # | loc=192.0.2.65 loc=192.0.2.81 | # | rem=192.0.2.66 --. rem=192.0.2.82 --. | # | tos=inherit | tos=inherit | | # | .------------------' | | # | | .------------------' | # | v v | # | + $ul1.111 (vlan) + $ul1.222 (vlan) | # | | 192.0.2.129/28 | 192.0.2.145/28 | # | \ / | # | \________________/ | # | | | # | + $ul1 | # +------------|-------------------------------+ # | # +------------|-------------------------------+ # | SW2 + $ul2 | # | _______|________ | # | / \ | # | / \ | # | + $ul2.111 (vlan) + $ul2.222 (vlan) | # | ^ 192.0.2.130/28 ^ 192.0.2.146/28 | # | | | | # | | '------------------. | # | '------------------. | | # | + g2a (gre) | + g2b (gre) | | # | loc=192.0.2.66 | loc=192.0.2.82 | | # | rem=192.0.2.65 --' rem=192.0.2.81 --' | # | tos=inherit tos=inherit | # | | # | $ol2 + | # | 192.0.2.17/28 | | # +-------------------|------------------------+ # | # +-------------------|-----+ # | H2 | | # | $h2 + | # | 192.0.2.18/28 | # +-------------------------+ ALL_TESTS=" ping_ipv4 multipath_ipv4 " NUM_NETIFS=6 source lib.sh h1_create() { simple_if_init $h1 192.0.2.1/28 2001:db8:1::1/64 ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2 } h1_destroy() { ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2 simple_if_fini $h1 192.0.2.1/28 } sw1_create() { simple_if_init $ol1 192.0.2.2/28 __simple_if_init $ul1 v$ol1 vlan_create $ul1 111 v$ol1 192.0.2.129/28 vlan_create $ul1 222 v$ol1 192.0.2.145/28 tunnel_create g1a gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1 __simple_if_init g1a v$ol1 192.0.2.65/32 ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130 tunnel_create g1b gre 192.0.2.81 192.0.2.82 tos inherit dev v$ol1 __simple_if_init g1b v$ol1 192.0.2.81/32 ip route add vrf v$ol1 192.0.2.82/32 via 192.0.2.146 ip route add vrf v$ol1 192.0.2.16/28 \ nexthop dev g1a \ nexthop dev g1b } sw1_destroy() { ip route del vrf v$ol1 192.0.2.16/28 ip route del vrf v$ol1 192.0.2.82/32 via 192.0.2.146 __simple_if_fini g1b 192.0.2.81/32 tunnel_destroy g1b ip route del vrf v$ol1 192.0.2.66/32 via 192.0.2.130 __simple_if_fini g1a 192.0.2.65/32 tunnel_destroy g1a vlan_destroy $ul1 222 vlan_destroy $ul1 111 __simple_if_fini $ul1 simple_if_fini $ol1 192.0.2.2/28 } sw2_create() { simple_if_init $ol2 192.0.2.17/28 __simple_if_init $ul2 v$ol2 vlan_create $ul2 111 v$ol2 192.0.2.130/28 vlan_create $ul2 222 v$ol2 192.0.2.146/28 tunnel_create g2a gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol2 __simple_if_init g2a v$ol2 192.0.2.66/32 ip route add vrf v$ol2 192.0.2.65/32 via 192.0.2.129 tunnel_create g2b gre 192.0.2.82 192.0.2.81 tos inherit dev v$ol2 __simple_if_init g2b v$ol2 192.0.2.82/32 ip route add vrf v$ol2 192.0.2.81/32 via 192.0.2.145 ip route add vrf v$ol2 192.0.2.0/28 \ nexthop dev g2a \ nexthop dev g2b tc qdisc add dev $ul2 clsact tc filter add dev $ul2 ingress pref 111 prot 802.1Q \ flower vlan_id 111 action pass tc filter add dev $ul2 ingress pref 222 prot 802.1Q \ flower vlan_id 222 action pass } sw2_destroy() { tc qdisc del dev $ul2 clsact ip route del vrf v$ol2 192.0.2.0/28 ip route del vrf v$ol2 192.0.2.81/32 via 192.0.2.145 __simple_if_fini g2b 192.0.2.82/32 tunnel_destroy g2b ip route del vrf v$ol2 192.0.2.65/32 via 192.0.2.129 __simple_if_fini g2a 192.0.2.66/32 tunnel_destroy g2a vlan_destroy $ul2 222 vlan_destroy $ul2 111 __simple_if_fini $ul2 simple_if_fini $ol2 192.0.2.17/28 } h2_create() { simple_if_init $h2 192.0.2.18/28 ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17 } h2_destroy() { ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17 simple_if_fini $h2 192.0.2.18/28 } setup_prepare() { h1=${NETIFS[p1]} ol1=${NETIFS[p2]} ul1=${NETIFS[p3]} ul2=${NETIFS[p4]} ol2=${NETIFS[p5]} h2=${NETIFS[p6]} vrf_prepare h1_create sw1_create sw2_create h2_create forwarding_enable } cleanup() { pre_cleanup forwarding_restore h2_destroy sw2_destroy sw1_destroy h1_destroy vrf_cleanup } multipath4_test() { local what=$1; shift local weight1=$1; shift local weight2=$1; shift sysctl_set net.ipv4.fib_multipath_hash_policy 1 ip route replace vrf v$ol1 192.0.2.16/28 \ nexthop dev g1a weight $weight1 \ nexthop dev g1b weight $weight2 local t0_111=$(tc_rule_stats_get $ul2 111 ingress) local t0_222=$(tc_rule_stats_get $ul2 222 ingress) ip vrf exec v$h1 \ $MZ $h1 -q -p 64 -A 192.0.2.1 -B 192.0.2.18 \ -d 1msec -t udp "sp=1024,dp=0-32768" local t1_111=$(tc_rule_stats_get $ul2 111 ingress) local t1_222=$(tc_rule_stats_get $ul2 222 ingress) local d111=$((t1_111 - t0_111)) local d222=$((t1_222 - t0_222)) multipath_eval "$what" $weight1 $weight2 $d111 $d222 ip route replace vrf v$ol1 192.0.2.16/28 \ nexthop dev g1a \ nexthop dev g1b sysctl_restore net.ipv4.fib_multipath_hash_policy } ping_ipv4() { ping_test $h1 192.0.2.18 } multipath_ipv4() { log_info "Running 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