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-$(mktemp -u XXXXXX)"
16readonly V4_ADDR0=10.0.10.1
17readonly V4_ADDR1=10.0.10.2
18readonly V6_ADDR0=2001:db8:91::1
19readonly V6_ADDR1=2001:db8:91::2
20nsid=100
21
22cleanup_v6()
23{
24 ip netns del me
25 ip netns del peer
26
27 sysctl -w net.ipv4.conf.veth0.ndisc_evict_nocarrier=1 >/dev/null 2>&1
28 sysctl -w net.ipv4.conf.all.ndisc_evict_nocarrier=1 >/dev/null 2>&1
29}
30
31create_ns()
32{
33 local n=${1}
34
35 ip netns del ${n} 2>/dev/null
36
37 ip netns add ${n}
38 ip netns set ${n} $((nsid++))
39 ip -netns ${n} link set lo up
40}
41
42
43setup_v6() {
44 create_ns me
45 create_ns peer
46
47 IP="ip -netns me"
48
49 $IP li add veth1 type veth peer name veth2
50 $IP li set veth1 up
51 $IP -6 addr add $V6_ADDR0/64 dev veth1 nodad
52 $IP li set veth2 netns peer up
53 ip -netns peer -6 addr add $V6_ADDR1/64 dev veth2 nodad
54
55 ip netns exec me sysctl -w $1 >/dev/null 2>&1
56
57 # Establish an ND cache entry
58 ip netns exec me ping -6 -c1 -Iveth1 $V6_ADDR1 >/dev/null 2>&1
59 # Should have the veth1 entry in ND table
60 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
61 if [ $? -ne 0 ]; then
62 cleanup_v6
63 echo "failed"
64 exit
65 fi
66
67 # Set veth2 down, which will put veth1 in NOCARRIER state
68 ip netns exec peer ip link set veth2 down
69}
70
71setup_v4() {
72 ip netns add "${PEER_NS}"
73 ip link add name veth0 type veth peer name veth1
74 ip link set dev veth0 up
75 ip link set dev veth1 netns "${PEER_NS}"
76 ip netns exec "${PEER_NS}" ip link set dev veth1 up
77 ip addr add $V4_ADDR0/24 dev veth0
78 ip netns exec "${PEER_NS}" ip addr add $V4_ADDR1/24 dev veth1
79 ip netns exec ${PEER_NS} ip route add default via $V4_ADDR1 dev veth1
80 ip route add default via $V4_ADDR0 dev veth0
81
82 sysctl -w "$1" >/dev/null 2>&1
83
84 # Establish an ARP cache entry
85 ping -c1 -I veth0 $V4_ADDR1 -q >/dev/null 2>&1
86 # Should have the veth1 entry in ARP table
87 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
88 if [ $? -ne 0 ]; then
89 cleanup_v4
90 echo "failed"
91 exit
92 fi
93
94 # Set veth1 down, which will put veth0 in NOCARRIER state
95 ip netns exec "${PEER_NS}" ip link set veth1 down
96}
97
98cleanup_v4() {
99 ip neigh flush dev veth0
100 ip link del veth0
101 local -r ns="$(ip netns list|grep $PEER_NS)"
102 [ -n "$ns" ] && ip netns del $ns 2>/dev/null
103
104 sysctl -w net.ipv4.conf.veth0.arp_evict_nocarrier=1 >/dev/null 2>&1
105 sysctl -w net.ipv4.conf.all.arp_evict_nocarrier=1 >/dev/null 2>&1
106}
107
108# Run test when arp_evict_nocarrier = 1 (default).
109run_arp_evict_nocarrier_enabled() {
110 echo "run arp_evict_nocarrier=1 test"
111 setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=1"
112
113 # ARP table should be empty
114 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
115
116 if [ $? -eq 0 ];then
117 echo "failed"
118 else
119 echo "ok"
120 fi
121
122 cleanup_v4
123}
124
125# Run test when arp_evict_nocarrier = 0
126run_arp_evict_nocarrier_disabled() {
127 echo "run arp_evict_nocarrier=0 test"
128 setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=0"
129
130 # ARP table should still contain the entry
131 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
132
133 if [ $? -eq 0 ];then
134 echo "ok"
135 else
136 echo "failed"
137 fi
138
139 cleanup_v4
140}
141
142run_arp_evict_nocarrier_disabled_all() {
143 echo "run all.arp_evict_nocarrier=0 test"
144 setup_v4 "net.ipv4.conf.all.arp_evict_nocarrier=0"
145
146 # ARP table should still contain the entry
147 ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
148
149 if [ $? -eq 0 ];then
150 echo "ok"
151 else
152 echo "failed"
153 fi
154
155 cleanup_v4
156}
157
158run_ndisc_evict_nocarrier_enabled() {
159 echo "run ndisc_evict_nocarrier=1 test"
160
161 setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=1"
162
163 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
164
165 if [ $? -eq 0 ];then
166 echo "failed"
167 else
168 echo "ok"
169 fi
170
171 cleanup_v6
172}
173
174run_ndisc_evict_nocarrier_disabled() {
175 echo "run ndisc_evict_nocarrier=0 test"
176
177 setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=0"
178
179 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
180
181 if [ $? -eq 0 ];then
182 echo "ok"
183 else
184 echo "failed"
185 fi
186
187 cleanup_v6
188}
189
190run_ndisc_evict_nocarrier_disabled_all() {
191 echo "run all.ndisc_evict_nocarrier=0 test"
192
193 setup_v6 "net.ipv6.conf.all.ndisc_evict_nocarrier=0"
194
195 ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
196
197 if [ $? -eq 0 ];then
198 echo "ok"
199 else
200 echo "failed"
201 fi
202
203 cleanup_v6
204}
205
206run_all_tests() {
207 run_arp_evict_nocarrier_enabled
208 run_arp_evict_nocarrier_disabled
209 run_arp_evict_nocarrier_disabled_all
210 run_ndisc_evict_nocarrier_enabled
211 run_ndisc_evict_nocarrier_disabled
212 run_ndisc_evict_nocarrier_disabled_all
213}
214
215if [ "$(id -u)" -ne 0 ];then
216 echo "SKIP: Need root privileges"
217 exit $ksft_skip;
218fi
219
220run_all_tests