new file mode 100755
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+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+ ipv4_route_addition_test
+ ipv4_route_deletion_test
+ ipv4_route_replacement_test
+ ipv6_route_addition_test
+ ipv6_route_deletion_test
+ ipv6_route_replacement_test
+"
+
+NETDEVSIM_PATH=/sys/bus/netdevsim/
+DEV_ADDR=1337
+DEV=netdevsim${DEV_ADDR}
+DEVLINK_DEV=netdevsim/${DEV}
+SYSFS_NET_DIR=/sys/bus/netdevsim/devices/$DEV/net/
+NUM_NETIFS=0
+source $lib_dir/lib.sh
+
+check_rt_trap()
+{
+ local outfile=$1; shift
+ local line
+
+ # Make sure that the first notification was emitted without RTM_F_TRAP
+ # flag and the second with RTM_F_TRAP flag
+ head -n 1 $outfile | grep -q "rt_trap"
+ if [[ $? -eq 0 ]]; then
+ return 1
+ fi
+
+ head -n 2 $outfile | tail -n 1 | grep -q "rt_trap"
+}
+
+route_notify_check()
+{
+ local outfile=$1; shift
+ local expected_num_lines=$1; shift
+
+ # check the monitor results
+ lines=`wc -l $outfile | cut "-d " -f1`
+ test $lines -eq $expected_num_lines
+ check_err $? "$expected_num_lines notifications were expected but $lines were received"
+
+ if [[ $expected_num_lines -eq 2 ]]; then
+ check_rt_trap $outfile
+ check_err $? "Wrong RTM_F_TRAP flags in notifications"
+ fi
+}
+
+route_addition_check()
+{
+ local ip=$1; shift
+ local notify=$1; shift
+ local route=$1; shift
+ local expected_num_notifications=$1; shift
+
+ ip netns exec testns1 sysctl -qw net.$ip.fib_notify_on_flag_change=$notify
+
+ local outfile=$(mktemp)
+
+ $IP monitor route &> $outfile &
+ sleep 1
+ $IP route add $route dev dummy1
+ sleep 1
+ kill %% && wait %% &> /dev/null
+
+ route_notify_check $outfile $expected_num_notifications
+ rm -f $outfile
+
+ $IP route del $route dev dummy1
+}
+
+ipv4_route_addition_test()
+{
+ RET=0
+
+ local ip="ipv4"
+ local route=192.0.2.0/24
+
+ # Make sure a single notification will be emitted for the programmed
+ # route.
+ local notify=0
+ local expected_num_notifications=1
+ # route_addition_check will assign value to RET.
+ route_addition_check $ip $notify $route $expected_num_notifications
+
+ # Make sure two notifications will be emitted for the programmed route.
+ notify=1
+ expected_num_notifications=2
+ route_addition_check $ip $notify $route $expected_num_notifications
+
+ log_test "IPv4 route addition"
+}
+
+route_deletion_check()
+{
+ local ip=$1; shift
+ local notify=$1; shift
+ local route=$1; shift
+ local expected_num_notifications=$1; shift
+
+ ip netns exec testns1 sysctl -qw net.$ip.fib_notify_on_flag_change=$notify
+ $IP route add $route dev dummy1
+ sleep 1
+
+ local outfile=$(mktemp)
+
+ $IP monitor route &> $outfile &
+ sleep 1
+ $IP route del $route dev dummy1
+ sleep 1
+ kill %% && wait %% &> /dev/null
+
+ route_notify_check $outfile $expected_num_notifications
+ rm -f $outfile
+}
+
+ipv4_route_deletion_test()
+{
+ RET=0
+
+ local ip="ipv4"
+ local route=192.0.2.0/24
+ local expected_num_notifications=1
+
+ # Make sure a single notification will be emitted for the deleted route,
+ # regardless of fib_notify_on_flag_change value.
+ local notify=0
+ # route_deletion_check will assign value to RET.
+ route_deletion_check $ip $notify $route $expected_num_notifications
+
+ notify=1
+ route_deletion_check $ip $notify $route $expected_num_notifications
+
+ log_test "IPv4 route deletion"
+}
+
+route_replacement_check()
+{
+ local ip=$1; shift
+ local notify=$1; shift
+ local route=$1; shift
+ local expected_num_notifications=$1; shift
+
+ ip netns exec testns1 sysctl -qw net.$ip.fib_notify_on_flag_change=$notify
+ $IP route add $route dev dummy1
+ sleep 1
+
+ local outfile=$(mktemp)
+
+ $IP monitor route &> $outfile &
+ sleep 1
+ $IP route replace $route dev dummy2
+ sleep 1
+ kill %% && wait %% &> /dev/null
+
+ route_notify_check $outfile $expected_num_notifications
+ rm -f $outfile
+
+ $IP route del $route dev dummy2
+}
+
+ipv4_route_replacement_test()
+{
+ RET=0
+
+ local ip="ipv4"
+ local route=192.0.2.0/24
+
+ $IP link add name dummy2 type dummy
+ $IP link set dev dummy2 up
+
+ # Make sure a single notification will be emitted for the new route.
+ local notify=0
+ local expected_num_notifications=1
+ # route_replacement_check will assign value to RET.
+ route_replacement_check $ip $notify $route $expected_num_notifications
+
+ # Make sure two notifications will be emitted for the new route.
+ notify=1
+ expected_num_notifications=2
+ route_replacement_check $ip $notify $route $expected_num_notifications
+
+ $IP link del name dummy2
+
+ log_test "IPv4 route replacement"
+}
+
+ipv6_route_addition_test()
+{
+ RET=0
+
+ local ip="ipv6"
+ local route=2001:db8:1::/64
+
+ # Make sure a single notification will be emitted for the programmed
+ # route.
+ local notify=0
+ local expected_num_notifications=1
+ route_addition_check $ip $notify $route $expected_num_notifications
+
+ # Make sure two notifications will be emitted for the programmed route.
+ notify=1
+ expected_num_notifications=2
+ route_addition_check $ip $notify $route $expected_num_notifications
+
+ log_test "IPv6 route addition"
+}
+
+ipv6_route_deletion_test()
+{
+ RET=0
+
+ local ip="ipv6"
+ local route=2001:db8:1::/64
+ local expected_num_notifications=1
+
+ # Make sure a single notification will be emitted for the deleted route,
+ # regardless of fib_notify_on_flag_change value.
+ local notify=0
+ route_deletion_check $ip $notify $route $expected_num_notifications
+
+ notify=1
+ route_deletion_check $ip $notify $route $expected_num_notifications
+
+ log_test "IPv6 route deletion"
+}
+
+ipv6_route_replacement_test()
+{
+ RET=0
+
+ local ip="ipv6"
+ local route=2001:db8:1::/64
+
+ $IP link add name dummy2 type dummy
+ $IP link set dev dummy2 up
+
+ # Make sure a single notification will be emitted for the new route.
+ local notify=0
+ local expected_num_notifications=1
+ route_replacement_check $ip $notify $route $expected_num_notifications
+
+ # Make sure two notifications will be emitted for the new route.
+ notify=1
+ expected_num_notifications=2
+ route_replacement_check $ip $notify $route $expected_num_notifications
+
+ $IP link del name dummy2
+
+ log_test "IPv6 route replacement"
+}
+
+setup_prepare()
+{
+ modprobe netdevsim &> /dev/null
+ echo "$DEV_ADDR 1" > ${NETDEVSIM_PATH}/new_device
+ while [ ! -d $SYSFS_NET_DIR ] ; do :; done
+
+ ip netns add testns1
+
+ if [ $? -ne 0 ]; then
+ echo "Failed to add netns \"testns1\""
+ exit 1
+ fi
+
+ devlink dev reload $DEVLINK_DEV netns testns1
+
+ if [ $? -ne 0 ]; then
+ echo "Failed to reload into netns \"testns1\""
+ exit 1
+ fi
+
+ IP="ip -n testns1"
+
+ $IP link add name dummy1 type dummy
+ $IP link set dev dummy1 up
+}
+
+cleanup()
+{
+ pre_cleanup
+
+ $IP link del name dummy1
+ ip netns del testns1
+ echo "$DEV_ADDR" > ${NETDEVSIM_PATH}/del_device
+ modprobe -r netdevsim &> /dev/null
+}
+
+trap cleanup EXIT
+
+setup_prepare
+
+tests_run
+
+exit $EXIT_STATUS