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    ip address add 127.25.3.4/24 dev veth0
22    ip link set dev veth0 up
23    ip netns exec "${PEER_NS}" ip address add 127.25.3.14/24 dev veth1
24    ip netns exec "${PEER_NS}" ip link set dev veth1 up
25
26    ip route flush cache
27    ip netns exec "${PEER_NS}" ip route flush cache
28}
29
30cleanup() {
31    ip link del veth0
32    ip route add local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
33    local -r ns="$(ip netns list|grep $PEER_NS)"
34    [ -n "$ns" ] && ip netns del $ns 2>/dev/null
35}
36
37# Run test when arp_announce = 2.
38run_arp_announce_test() {
39    echo "run arp_announce test"
40    setup
41
42    sysctl -w net.ipv4.conf.veth0.arp_announce=2
43    ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_announce=2
44    ping -c5 -I veth0 127.25.3.14
45    if [ $? -ne 0 ];then
46        echo "failed"
47    else
48        echo "ok"
49    fi
50
51    cleanup
52}
53
54# Run test when arp_ignore = 3.
55run_arp_ignore_test() {
56    echo "run arp_ignore test"
57    setup
58
59    sysctl -w net.ipv4.conf.veth0.arp_ignore=3
60    ip netns exec "${PEER_NS}" sysctl -w net.ipv4.conf.veth1.arp_ignore=3
61    ping -c5 -I veth0 127.25.3.14
62    if [ $? -ne 0 ];then
63        echo "failed"
64    else
65        echo "ok"
66    fi
67
68    cleanup
69}
70
71run_all_tests() {
72    run_arp_announce_test
73    run_arp_ignore_test
74}
75
76run_all_tests
77