1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# Run a couple of tests when route_localnet = 1.
5
6readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
7
8setup() {
9    ip netns add "${PEER_NS}"
10    ip -netns "${PEER_NS}" link set dev lo up
11    ip link add name veth0 type veth peer name veth1
12    ip link set dev veth0 up
13    ip link set dev veth1 netns "${PEER_NS}"
14
15    # Enable route_localnet and delete useless route 127.0.0.0/8.
16    sysctl -w net.ipv4.conf.veth0.route_localnet=1
17    ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.route_localnet=1
18    ip route del 127.0.0.0/8 dev lo table local
19    ip netns exec "${PEER_NS}" ip route del 127.0.0.0/8 dev lo table local
20
21    ifconfig veth0 127.25.3.4/24 up
22    ip netns exec "${PEER_NS}" ifconfig veth1 127.25.3.14/24 up
23
24    ip route flush cache
25    ip netns exec "${PEER_NS}" ip route flush cache
26}
27
28cleanup() {
29    ip link del veth0
30    ip route add local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
31    local -r ns="$(ip netns list|grep $PEER_NS)"
32    [ -n "$ns" ] && ip netns del $ns 2>/dev/null
33}
34
35# Run test when arp_announce = 2.
36run_arp_announce_test() {
37    echo "run arp_announce test"
38    setup
39
40    sysctl -w net.ipv4.conf.veth0.arp_announce=2
41    ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_announce=2
42    ping -c5 -I veth0 127.25.3.14
43    if [ $? -ne 0 ];then
44        echo "failed"
45    else
46        echo "ok"
47    fi
48
49    cleanup
50}
51
52# Run test when arp_ignore = 3.
53run_arp_ignore_test() {
54    echo "run arp_ignore test"
55    setup
56
57    sysctl -w net.ipv4.conf.veth0.arp_ignore=3
58    ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_ignore=3
59    ping -c5 -I veth0 127.25.3.14
60    if [ $? -ne 0 ];then
61        echo "failed"
62    else
63        echo "ok"
64    fi
65
66    cleanup
67}
68
69run_all_tests() {
70    run_arp_announce_test
71    run_arp_ignore_test
72}
73
74run_all_tests
75