arp_ndisc_evict_nocarrier.sh

  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
 15source lib.sh
 16
 17readonly V4_ADDR0=10.0.10.1
 18readonly V4_ADDR1=10.0.10.2
 19readonly V6_ADDR0=2001:db8:91::1
 20readonly V6_ADDR1=2001:db8:91::2
 21nsid=100
 22ret=0
 23
 24cleanup_v6()
 25{
 26    cleanup_ns ${me} ${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
 32setup_v6() {
 33    setup_ns me peer
 34
 35    IP="ip -netns ${me}"
 36
 37    $IP li add veth1 type veth peer name veth2
 38    $IP li set veth1 up
 39    $IP -6 addr add $V6_ADDR0/64 dev veth1 nodad
 40    $IP li set veth2 netns ${peer} up
 41    ip -netns ${peer} -6 addr add $V6_ADDR1/64 dev veth2 nodad
 42
 43    ip netns exec ${me} sysctl -w $1 >/dev/null 2>&1
 44
 45    # Establish an ND cache entry
 46    ip netns exec ${me} ping -6 -c1 -Iveth1 $V6_ADDR1 >/dev/null 2>&1
 47    # Should have the veth1 entry in ND table
 48    ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
 49    if [ $? -ne 0 ]; then
 50        cleanup_v6
 51        echo "failed"
 52        exit 1
 53    fi
 54
 55    # Set veth2 down, which will put veth1 in NOCARRIER state
 56    ip netns exec ${peer} ip link set veth2 down
 57}
 58
 59setup_v4() {
 60    setup_ns PEER_NS
 61    ip link add name veth0 type veth peer name veth1
 62    ip link set dev veth0 up
 63    ip link set dev veth1 netns "${PEER_NS}"
 64    ip netns exec "${PEER_NS}" ip link set dev veth1 up
 65    ip addr add $V4_ADDR0/24 dev veth0
 66    ip netns exec "${PEER_NS}" ip addr add $V4_ADDR1/24 dev veth1
 67    ip netns exec ${PEER_NS} ip route add default via $V4_ADDR1 dev veth1
 68    ip route add default via $V4_ADDR0 dev veth0
 69
 70    sysctl -w "$1" >/dev/null 2>&1
 71
 72    # Establish an ARP cache entry
 73    ping -c1 -I veth0 $V4_ADDR1 -q >/dev/null 2>&1
 74    # Should have the veth1 entry in ARP table
 75    ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
 76    if [ $? -ne 0 ]; then
 77        cleanup_v4
 78        echo "failed; is the system using MACAddressPolicy=persistent ?"
 79        exit 1
 80    fi
 81
 82    # Set veth1 down, which will put veth0 in NOCARRIER state
 83    ip netns exec "${PEER_NS}" ip link set veth1 down
 84}
 85
 86cleanup_v4() {
 87    ip neigh flush dev veth0
 88    ip link del veth0
 89    cleanup_ns $PEER_NS
 90
 91    sysctl -w net.ipv4.conf.veth0.arp_evict_nocarrier=1 >/dev/null 2>&1
 92    sysctl -w net.ipv4.conf.all.arp_evict_nocarrier=1 >/dev/null 2>&1
 93}
 94
 95# Run test when arp_evict_nocarrier = 1 (default).
 96run_arp_evict_nocarrier_enabled() {
 97    echo "run arp_evict_nocarrier=1 test"
 98    setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=1"
 99
100    # ARP table should be empty
101    ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
102
103    if [ $? -eq 0 ];then
104        echo "failed"
105        ret=1
106    else
107        echo "ok"
108    fi
109
110    cleanup_v4
111}
112
113# Run test when arp_evict_nocarrier = 0
114run_arp_evict_nocarrier_disabled() {
115    echo "run arp_evict_nocarrier=0 test"
116    setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=0"
117
118    # ARP table should still contain the entry
119    ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
120
121    if [ $? -eq 0 ];then
122        echo "ok"
123    else
124        echo "failed"
125        ret=1
126    fi
127
128    cleanup_v4
129}
130
131run_arp_evict_nocarrier_disabled_all() {
132    echo "run all.arp_evict_nocarrier=0 test"
133    setup_v4 "net.ipv4.conf.all.arp_evict_nocarrier=0"
134
135    # ARP table should still contain the entry
136    ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
137
138    if [ $? -eq 0 ];then
139        echo "ok"
140    else
141        echo "failed"
142    fi
143
144    cleanup_v4
145}
146
147run_ndisc_evict_nocarrier_enabled() {
148    echo "run ndisc_evict_nocarrier=1 test"
149
150    setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=1"
151
152    ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
153
154    if [ $? -eq 0 ];then
155        echo "failed"
156        ret=1
157    else
158        echo "ok"
159    fi
160
161    cleanup_v6
162}
163
164run_ndisc_evict_nocarrier_disabled() {
165    echo "run ndisc_evict_nocarrier=0 test"
166
167    setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=0"
168
169    ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
170
171    if [ $? -eq 0 ];then
172        echo "ok"
173    else
174        echo "failed"
175        ret=1
176    fi
177
178    cleanup_v6
179}
180
181run_ndisc_evict_nocarrier_disabled_all() {
182    echo "run all.ndisc_evict_nocarrier=0 test"
183
184    setup_v6 "net.ipv6.conf.all.ndisc_evict_nocarrier=0"
185
186    ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
187
188    if [ $? -eq 0 ];then
189        echo "ok"
190    else
191        echo "failed"
192        ret=1
193    fi
194
195    cleanup_v6
196}
197
198run_all_tests() {
199    run_arp_evict_nocarrier_enabled
200    run_arp_evict_nocarrier_disabled
201    run_arp_evict_nocarrier_disabled_all
202    run_ndisc_evict_nocarrier_enabled
203    run_ndisc_evict_nocarrier_disabled
204    run_ndisc_evict_nocarrier_disabled_all
205}
206
207if [ "$(id -u)" -ne 0 ];then
208	echo "SKIP: Need root privileges"
209	exit $ksft_skip;
210fi
211
212run_all_tests
213exit $ret