tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# Tests sysctl options {arp,ndisc}_evict_nocarrier={0,1}
5#
6# Create a veth pair and set IPs/routes on both. Then ping to establish
7# an entry in the ARP/ND table. Depending on the test set sysctl option to
8# 1 or 0. Set remote veth down which will cause local veth to go into a no
9# carrier state. Depending on the test check the ARP/ND table:
10#
11# {arp,ndisc}_evict_nocarrier=1 should contain no ARP/ND after no carrier
12# {arp,ndisc}_evict_nocarrer=0 should still contain the single ARP/ND entry
13#
14
15readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
16readonly V4_ADDR0=10.0.10.1
17readonly V4_ADDR1=10.0.10.2
18readonly V6_ADDR0=2001:db8:91::1
19readonly V6_ADDR1=2001:db8:91::2
20nsid=100
21ret=0
22
23cleanup_v6()
24{
25 ip netns del me
26 ip netns del peer
27
28 sysctl -w net.ipv6.conf.veth1.ndisc_evict_nocarrier=1 >/dev/null 2>&1
29 sysctl -w net.ipv6.conf.all.ndisc_evict_nocarrier=1 >/dev/null 2>&1
30}
31
32create_ns()
33{
34 local n=${1}
35
36 ip netns del ${n} 2>/dev/null
37
38 ip netns add ${n}
39 ip netns set ${n} $((nsid++))
40 ip -netns ${n} link set lo up
41}
42
43
44setup_v6() {
45 create_ns me
46 create_ns peer
47
48 IP="ip -netns me"
49
50 $IP li add veth1 type veth peer name veth2
51 $IP li set veth1 up
52 $IP -6 addr add $V6_ADDR0/64 dev veth1 nodad
53 $IP li set veth2 netns peer up
54 ip -netns peer -6 addr add $V6_ADDR1/64 dev veth2 nodad
55
56 ip netns exec me sysctl -w $1 >/dev/null 2>&1
57
58 # Establish an ND cache entry
59 ip netns exec me ping -6 -c1 -Iveth1 $V6_ADDR1 >/dev/null 2>&1
60 # Should have the veth1 entry in ND table
61 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
62 if [ $? -ne 0 ]; then
63 cleanup_v6
64 echo "failed"
65 exit 1
66 fi
67
68 # Set veth2 down, which will put veth1 in NOCARRIER state
69 ip netns exec peer ip link set veth2 down
70}
71
72setup_v4() {
73 ip netns add "${PEER_NS}"
74 ip link add name veth0 type veth peer name veth1
75 ip link set dev veth0 up
76 ip link set dev veth1 netns "${PEER_NS}"
77 ip netns exec "${PEER_NS}" ip link set dev veth1 up
78 ip addr add $V4_ADDR0/24 dev veth0
79 ip netns exec "${PEER_NS}" ip addr add $V4_ADDR1/24 dev veth1
80 ip netns exec ${PEER_NS} ip route add default via $V4_ADDR1 dev veth1
81 ip route add default via $V4_ADDR0 dev veth0
82
83 sysctl -w "$1" >/dev/null 2>&1
84
85 # Establish an ARP cache entry
86 ping -c1 -I veth0 $V4_ADDR1 -q >/dev/null 2>&1
87 # Should have the veth1 entry in ARP table
88 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
89 if [ $? -ne 0 ]; then
90 cleanup_v4
91 echo "failed"
92 exit 1
93 fi
94
95 # Set veth1 down, which will put veth0 in NOCARRIER state
96 ip netns exec "${PEER_NS}" ip link set veth1 down
97}
98
99cleanup_v4() {
100 ip neigh flush dev veth0
101 ip link del veth0
102 local -r ns="$(ip netns list|grep $PEER_NS)"
103 [ -n "$ns" ] && ip netns del $ns 2>/dev/null
104
105 sysctl -w net.ipv4.conf.veth0.arp_evict_nocarrier=1 >/dev/null 2>&1
106 sysctl -w net.ipv4.conf.all.arp_evict_nocarrier=1 >/dev/null 2>&1
107}
108
109# Run test when arp_evict_nocarrier = 1 (default).
110run_arp_evict_nocarrier_enabled() {
111 echo "run arp_evict_nocarrier=1 test"
112 setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=1"
113
114 # ARP table should be empty
115 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
116
117 if [ $? -eq 0 ];then
118 echo "failed"
119 ret=1
120 else
121 echo "ok"
122 fi
123
124 cleanup_v4
125}
126
127# Run test when arp_evict_nocarrier = 0
128run_arp_evict_nocarrier_disabled() {
129 echo "run arp_evict_nocarrier=0 test"
130 setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=0"
131
132 # ARP table should still contain the entry
133 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
134
135 if [ $? -eq 0 ];then
136 echo "ok"
137 else
138 echo "failed"
139 ret=1
140 fi
141
142 cleanup_v4
143}
144
145run_arp_evict_nocarrier_disabled_all() {
146 echo "run all.arp_evict_nocarrier=0 test"
147 setup_v4 "net.ipv4.conf.all.arp_evict_nocarrier=0"
148
149 # ARP table should still contain the entry
150 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
151
152 if [ $? -eq 0 ];then
153 echo "ok"
154 else
155 echo "failed"
156 fi
157
158 cleanup_v4
159}
160
161run_ndisc_evict_nocarrier_enabled() {
162 echo "run ndisc_evict_nocarrier=1 test"
163
164 setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=1"
165
166 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
167
168 if [ $? -eq 0 ];then
169 echo "failed"
170 ret=1
171 else
172 echo "ok"
173 fi
174
175 cleanup_v6
176}
177
178run_ndisc_evict_nocarrier_disabled() {
179 echo "run ndisc_evict_nocarrier=0 test"
180
181 setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=0"
182
183 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
184
185 if [ $? -eq 0 ];then
186 echo "ok"
187 else
188 echo "failed"
189 ret=1
190 fi
191
192 cleanup_v6
193}
194
195run_ndisc_evict_nocarrier_disabled_all() {
196 echo "run all.ndisc_evict_nocarrier=0 test"
197
198 setup_v6 "net.ipv6.conf.all.ndisc_evict_nocarrier=0"
199
200 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
201
202 if [ $? -eq 0 ];then
203 echo "ok"
204 else
205 echo "failed"
206 ret=1
207 fi
208
209 cleanup_v6
210}
211
212run_all_tests() {
213 run_arp_evict_nocarrier_enabled
214 run_arp_evict_nocarrier_disabled
215 run_arp_evict_nocarrier_disabled_all
216 run_ndisc_evict_nocarrier_enabled
217 run_ndisc_evict_nocarrier_disabled
218 run_ndisc_evict_nocarrier_disabled_all
219}
220
221if [ "$(id -u)" -ne 0 ];then
222 echo "SKIP: Need root privileges"
223 exit $ksft_skip;
224fi
225
226run_all_tests
227exit $ret