Verify that in this scenario

------------------------ N2 | | ------ ------ N3 ---- | R1 | | R2 |------|H2| ------ ------ ---- | | ------------------------ N1 | ---- |H1| ----

where H1's default route goes through R1 and R1's default route goes through R2 over N2, traceroute6 from H1 to H2 reports R2's address on N2 and not N1.

Signed-off-by: Francesco Ruggeri fruggeri@arista.com --- tools/testing/selftests/net/Makefile | 1 + .../testing/selftests/net/icmp6_reply_addr.sh | 159 ++++++++++++++++++ 2 files changed, 160 insertions(+) create mode 100755 tools/testing/selftests/net/icmp6_reply_addr.sh

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 0bd6b23c97ef..daeaeb59d5ca 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -11,6 +11,7 @@ TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh ipv6_flowlabel.sh TEST_PROGS += tcp_fastopen_backup_key.sh fcnal-test.sh l2tp.sh +TEST_PROGS += icmp6_reply_addr.sh TEST_PROGS_EXTENDED := in_netns.sh TEST_GEN_FILES = socket nettest TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any diff --git a/tools/testing/selftests/net/icmp6_reply_addr.sh b/tools/testing/selftests/net/icmp6_reply_addr.sh new file mode 100755 index 000000000000..551834cb9272 --- /dev/null +++ b/tools/testing/selftests/net/icmp6_reply_addr.sh @@ -0,0 +1,159 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Verify that in this scenario +# +# ------------------------ N2 +# | | +# ------ ------ N3 ---- +# | R1 | | R2 |------|H2| +# ------ ------ ---- +# | | +# ------------------------ N1 +# | +# ---- +# |H1| +# ---- +# +# where H1's default route goes through R1 and R1's default route goes +# through R2 over N2, traceroute6 from H1 to H2 reports R2's address +# on N2 and not N1. +# +# Addresses are assigned as follows: +# +# N1: 2000:101::/64 +# N2: 2000:102::/64 +# N3: 2000:103::/64 +# +# R1's host part of address: 1 +# R2's host part of address: 2 +# H1's host part of address: 3 +# H2's host part of address: 4 +# +# For example: +# the IPv6 address of R1's interface on N2 is 2000:102::1/64 + +#################################################################### +# helpers +# +# Interface on network <net> in node <node> is called <node><net> +# + +node() +{ + host=$1 + shift + ip netns exec ${host} $* +} + +create_nodes() +{ + for n in $*; do + ip netns add $n + node $n ip link set lo up + done +} + +delete_nodes() +{ + for n in $*; do + ip netns del $n + done +} + +create_veth_net() +{ + net=$1 + h1=$2 + h2=$3 + + ip link add ${h1}${net} type veth peer name ${h2}${net} + ip link set ${h1}${net} netns ${h1} + node ${h1} ip link set ${h1}${net} up + ip link set ${h2}${net} netns ${h2} + node ${h2} ip link set ${h2}${net} up +} + +create_macvlan_net() +{ + net=$1 + shift + nodes=$* + + ip link add ${net} type dummy + ip link set ${net} up + + for n in ${nodes}; do + ip link add link ${net} dev ${n}${net} type macvlan mode bridge + ip link set ${n}${net} netns $n + node ${n} ip link set ${n}${net} up + done +} + +delete_macvlan_nets() +{ + nets=$* + + for n in ${nets}; do + ip link del ${n} + done +} + +# end helpers +#################################################################### + +if [ "$(id -u)" -ne 0 ]; then + echo "SKIP: Need root privileges" + exit 0 +fi + +if [ ! -x "$(command -v traceroute6)" ]; then + echo "SKIP: Could not run test without traceroute6" + exit 0 +fi + +create_nodes host1 host2 rtr1 rtr2 + +create_macvlan_net net1 host1 rtr1 rtr2 +create_veth_net net2 rtr1 rtr2 +create_veth_net net3 rtr2 host2 + +# Configure interfaces and routes in host1 +node host1 ip -6 addr add 2000:101::3/64 dev host1net1 +node host1 ip -6 route add default via 2000:101::1 + +# Configure interfaces and routes in rtr1 +node rtr1 ip -6 addr add 2000:101::1/64 dev rtr1net1 +node rtr1 ip -6 addr add 2000:102::1/64 dev rtr1net2 +node rtr1 ip -6 route add default via 2000:102::2 +node rtr1 sysctl net.ipv6.conf.all.forwarding=1 >/dev/null + +# Configure interfaces and routes in rtr2 +node rtr2 ip -6 addr add 2000:101::2/64 dev rtr2net1 +node rtr2 ip -6 addr add 2000:102::2/64 dev rtr2net2 +node rtr2 ip -6 addr add 2000:103::2/64 dev rtr2net3 +node rtr2 sysctl net.ipv6.conf.all.forwarding=1 >/dev/null + +# Configure interfaces and routes in host2 +node host2 ip -6 addr add 2000:103::4/64 dev host2net3 +node host2 ip -6 route add default via 2000:103::2 + +# Ping host2 from host1 +echo "Priming the network" +node host1 ping6 -c5 2000:103::4 >/dev/null + +# Traceroute host2 from host1 +echo "Running traceroute6" +if node host1 traceroute6 2000:103::4 | grep -q 2000:102::2; then + ret=0 + echo "Found 2000:102::2. Test passed." +else + ret=1 + echo "Did not find 2000:102::2. Test failed." +fi + +delete_macvlan_nets net1 +delete_nodes host1 host2 rtr1 rtr2 + +exit ${ret} +