tools/testing/selftests/net/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
  15 source lib.sh
  16
  17 readonly V4_ADDR0=10.0.10.1
  18 readonly V4_ADDR1=10.0.10.2
  19 readonly V6_ADDR0=2001:db8:91::1
  20 readonly V6_ADDR1=2001:db8:91::2
  21 nsid=100
  22 ret=0
  23
  24 cleanup_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
  32 setup_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 ${peer} ip link set veth2 down
  57 }
  58
  59 setup_v4() {
  60     setup_ns PEER_NS
  61     ip link add name veth0 type veth peer name veth1
  62     ip link set dev veth0 up
  63     ip link set dev veth1 netns "${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 [ $? -ne 0 ]; then
  77         cleanup_v4
  78         echo "failed"
  79         exit 1
  80     fi
  81
  82     # Set veth1 down, which will put veth0 in NOCARRIER state
  83     ip netns exec "${PEER_NS}" ip link set veth1 down
  84 }
  85
  86 cleanup_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).
  96 run_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
 114 run_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
 131 run_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
 147 run_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
 164 run_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
 181 run_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 [ $? -eq 0 ];then
 189         echo "ok"
 190     else
 191         echo "failed"
 192         ret=1
 193     fi
 194
 195     cleanup_v6
 196 }
 197
 198 run_all_tests() {
 199     run_arp_evict_nocarrier_enabled
 200     run_arp_evict_nocarrier_disabled
 201     run_arp_evict_nocarrier_disabled_all
 202     run_ndisc_evict_nocarrier_enabled
 203     run_ndisc_evict_nocarrier_disabled
 204     run_ndisc_evict_nocarrier_disabled_all
 205 }
 206
 207 if [ "$(id -u)" -ne 0 ];then
 208         echo "SKIP: Need root privileges"
 209         exit $ksft_skip;
 210 fi
 211
 212 run_all_tests
 213 exit $ret