name : route_localnet.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Run a couple of tests when route_localnet = 1. readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)" setup() { ip netns add "${PEER_NS}" ip -netns "${PEER_NS}" link set dev lo up ip link add name veth0 type veth peer name veth1 ip link set dev veth0 up ip link set dev veth1 netns "${PEER_NS}" # Enable route_localnet and delete useless route 127.0.0.0/8. sysctl -w net.ipv4.conf.veth0.route_localnet=1 ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.route_localnet=1 ip route del 127.0.0.0/8 dev lo table local ip netns exec "${PEER_NS}" ip route del 127.0.0.0/8 dev lo table local ip address add 127.25.3.4/24 dev veth0 ip link set dev veth0 up ip netns exec "${PEER_NS}" ip address add 127.25.3.14/24 dev veth1 ip netns exec "${PEER_NS}" ip link set dev veth1 up ip route flush cache ip netns exec "${PEER_NS}" ip route flush cache } cleanup() { ip link del veth0 ip route add local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local -r ns="$(ip netns list|grep $PEER_NS)" [ -n "$ns" ] && ip netns del $ns 2>/dev/null } # Run test when arp_announce = 2. run_arp_announce_test() { echo "run arp_announce test" setup sysctl -w net.ipv4.conf.veth0.arp_announce=2 ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_announce=2 ping -c5 -I veth0 127.25.3.14 if [ $? -ne 0 ];then echo "failed" else echo "ok" fi cleanup } # Run test when arp_ignore = 3. run_arp_ignore_test() { echo "run arp_ignore test" setup sysctl -w net.ipv4.conf.veth0.arp_ignore=3 ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_ignore=3 ping -c5 -I veth0 127.25.3.14 if [ $? -ne 0 ];then echo "failed" else echo "ok" fi cleanup } run_all_tests() { run_arp_announce_test run_arp_ignore_test } run_all_tests