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|
#!/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
#
readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
readonly V4_ADDR0=10.0.10.1
readonly V4_ADDR1=10.0.10.2
readonly V6_ADDR0=2001:db8:91::1
readonly V6_ADDR1=2001:db8:91::2
nsid=100
cleanup_v6()
{
ip netns del me
ip netns del peer
sysctl -w net.ipv4.conf.veth0.ndisc_evict_nocarrier=1 >/dev/null 2>&1
sysctl -w net.ipv4.conf.all.ndisc_evict_nocarrier=1 >/dev/null 2>&1
}
create_ns()
{
local n=${1}
ip netns del ${n} 2>/dev/null
ip netns add ${n}
ip netns set ${n} $((nsid++))
ip -netns ${n} link set lo up
}
setup_v6() {
create_ns me
create_ns 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 [ $? -ne 0 ]; then
cleanup_v6
echo "failed"
exit
fi
# Set veth2 down, which will put veth1 in NOCARRIER state
ip netns exec peer ip link set veth2 down
}
setup_v4() {
ip netns add "${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 [ $? -ne 0 ]; then
cleanup_v4
echo "failed"
exit
fi
# Set veth1 down, which will put veth0 in NOCARRIER state
ip netns exec "${PEER_NS}" ip link set veth1 down
}
cleanup_v4() {
ip neigh flush dev veth0
ip link del veth0
local -r ns="$(ip netns list|grep $PEER_NS)"
[ -n "$ns" ] && ip netns del $ns 2>/dev/null
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"
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"
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"
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"
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 [ $? -eq 0 ];then
echo "ok"
else
echo "failed"
fi
cleanup_v6
}
run_all_tests() {
run_arp_evict_nocarrier_enabled
run_arp_evict_nocarrier_disabled
run_arp_evict_nocarrier_disabled_all
run_ndisc_evict_nocarrier_enabled
run_ndisc_evict_nocarrier_disabled
run_ndisc_evict_nocarrier_disabled_all
}
if [ "$(id -u)" -ne 0 ];then
echo "SKIP: Need root privileges"
exit $ksft_skip;
fi
run_all_tests
|
