name : arp_ndisc_evict_nocarrier.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Tests sysctl options {arp,ndisc}_evict_nocarrier={0,1} # # Create a veth pair and set IPs/routes on both. Then ping to establish # an entry in the ARP/ND table. Depending on the test set sysctl option to # 1 or 0. Set remote veth down which will cause local veth to go into a no # carrier state. Depending on the test check the ARP/ND table: # # {arp,ndisc}_evict_nocarrier=1 should contain no ARP/ND after no carrier # {arp,ndisc}_evict_nocarrer=0 should still contain the single ARP/ND entry # source lib.sh readonly V4_ADDR0=10.0.10.1 readonly V4_ADDR1=10.0.10.2 readonly V6_ADDR0=2001:db8:91::1 readonly V6_ADDR1=2001:db8:91::2 nsid=100 ret=0 cleanup_v6() { cleanup_ns ${me} ${peer} sysctl -w net.ipv6.conf.veth1.ndisc_evict_nocarrier=1 >/dev/null 2>&1 sysctl -w net.ipv6.conf.all.ndisc_evict_nocarrier=1 >/dev/null 2>&1 } setup_v6() { setup_ns me peer IP="ip -netns ${me}" $IP li add veth1 type veth peer name veth2 $IP li set veth1 up $IP -6 addr add $V6_ADDR0/64 dev veth1 nodad $IP li set veth2 netns ${peer} up ip -netns ${peer} -6 addr add $V6_ADDR1/64 dev veth2 nodad ip netns exec ${me} sysctl -w $1 >/dev/null 2>&1 # Establish an ND cache entry ip netns exec ${me} ping -6 -c1 -Iveth1 $V6_ADDR1 >/dev/null 2>&1 # Should have the veth1 entry in ND table ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1 if [ $? -ne 0 ]; then cleanup_v6 echo "failed" exit 1 fi # Set veth2 down, which will put veth1 in NOCARRIER state ip netns exec ${peer} ip link set veth2 down } setup_v4() { setup_ns PEER_NS ip link add name veth0 type veth peer name veth1 ip link set dev veth0 up ip link set dev veth1 netns "${PEER_NS}" ip netns exec "${PEER_NS}" ip link set dev veth1 up ip addr add $V4_ADDR0/24 dev veth0 ip netns exec "${PEER_NS}" ip addr add $V4_ADDR1/24 dev veth1 ip netns exec ${PEER_NS} ip route add default via $V4_ADDR1 dev veth1 ip route add default via $V4_ADDR0 dev veth0 sysctl -w "$1" >/dev/null 2>&1 # Establish an ARP cache entry ping -c1 -I veth0 $V4_ADDR1 -q >/dev/null 2>&1 # Should have the veth1 entry in ARP table ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1 if [ $? -ne 0 ]; then cleanup_v4 echo "failed" exit 1 fi # Set veth1 down, which will put veth0 in NOCARRIER state ip netns exec "${PEER_NS}" ip link set veth1 down } cleanup_v4() { ip neigh flush dev veth0 ip link del veth0 cleanup_ns $PEER_NS sysctl -w net.ipv4.conf.veth0.arp_evict_nocarrier=1 >/dev/null 2>&1 sysctl -w net.ipv4.conf.all.arp_evict_nocarrier=1 >/dev/null 2>&1 } # Run test when arp_evict_nocarrier = 1 (default). run_arp_evict_nocarrier_enabled() { echo "run arp_evict_nocarrier=1 test" setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=1" # ARP table should be empty ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "failed" ret=1 else echo "ok" fi cleanup_v4 } # Run test when arp_evict_nocarrier = 0 run_arp_evict_nocarrier_disabled() { echo "run arp_evict_nocarrier=0 test" setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=0" # ARP table should still contain the entry ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "ok" else echo "failed" ret=1 fi cleanup_v4 } run_arp_evict_nocarrier_disabled_all() { echo "run all.arp_evict_nocarrier=0 test" setup_v4 "net.ipv4.conf.all.arp_evict_nocarrier=0" # ARP table should still contain the entry ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "ok" else echo "failed" fi cleanup_v4 } run_ndisc_evict_nocarrier_enabled() { echo "run ndisc_evict_nocarrier=1 test" setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=1" ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "failed" ret=1 else echo "ok" fi cleanup_v6 } run_ndisc_evict_nocarrier_disabled() { echo "run ndisc_evict_nocarrier=0 test" setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=0" ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "ok" else echo "failed" ret=1 fi cleanup_v6 } run_ndisc_evict_nocarrier_disabled_all() { echo "run all.ndisc_evict_nocarrier=0 test" setup_v6 "net.ipv6.conf.all.ndisc_evict_nocarrier=0" ip netns exec ${me} ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1 if [ $? -eq 0 ];then echo "ok" else echo "failed" ret=1 fi cleanup_v6 } run_all_tests() { run_arp_evict_nocarrier_enabled run_arp_evict_nocarrier_disabled run_arp_evict_nocarrier_disabled_all run_ndisc_evict_nocarrier_enabled run_ndisc_evict_nocarrier_disabled run_ndisc_evict_nocarrier_disabled_all } if [ "$(id -u)" -ne 0 ];then echo "SKIP: Need root privileges" exit $ksft_skip; fi run_all_tests exit $ret