path: root/tools/testing/selftests/drivers/net/mlxsw/devlink_trap_l3_exceptions.sh

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Test devlink-trap L3 exceptions functionality over mlxsw.
# Check all exception traps to make sure they are triggered under the right
# conditions.

# +---------------------------------+
# | H1 (vrf)                        |
# |    + $h1                        |
# |    | 192.0.2.1/24               |
# |    | 2001:db8:1::1/64           |
# |    |                            |
# |    |  default via 192.0.2.2     |
# |    |  default via 2001:db8:1::2 |
# +----|----------------------------+
#      |
# +----|----------------------------------------------------------------------+
# | SW |                                                                      |
# |    + $rp1                                                                 |
# |        192.0.2.2/24                                                       |
# |        2001:db8:1::2/64                                                   |
# |                                                                           |
# |        2001:db8:2::2/64                                                   |
# |        198.51.100.2/24                                                    |
# |    + $rp2                                                                 |
# |    |                                                                      |
# +----|----------------------------------------------------------------------+
#      |
# +----|----------------------------+
# |    |  default via 198.51.100.2  |
# |    |  default via 2001:db8:2::2 |
# |    |                            |
# |    | 2001:db8:2::1/64           |
# |    | 198.51.100.1/24            |
# |    + $h2                        |
# | H2 (vrf)                        |
# +---------------------------------+

lib_dir=$(dirname $0)/../../../net/forwarding

ALL_TESTS="
	mtu_value_is_too_small_test
	ttl_value_is_too_small_test
	mc_reverse_path_forwarding_test
	reject_route_test
	unresolved_neigh_test
	ipv4_lpm_miss_test
	ipv6_lpm_miss_test
"

NUM_NETIFS=4
source $lib_dir/lib.sh
source $lib_dir/tc_common.sh
source $lib_dir/devlink_lib.sh

require_command $MCD
require_command $MC_CLI
table_name=selftests

h1_create()
{
	simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64

	ip -4 route add default vrf v$h1 nexthop via 192.0.2.2
	ip -6 route add default vrf v$h1 nexthop via 2001:db8:1::2

	tc qdisc add dev $h1 clsact
}

h1_destroy()
{
	tc qdisc del dev $h1 clsact

	ip -6 route del default vrf v$h1 nexthop via 2001:db8:1::2
	ip -4 route del default vrf v$h1 nexthop via 192.0.2.2

	simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
}

h2_create()
{
	simple_if_init $h2 198.51.100.1/24 2001:db8:2::1/64

	ip -4 route add default vrf v$h2 nexthop via 198.51.100.2
	ip -6 route add default vrf v$h2 nexthop via 2001:db8:2::2
}

h2_destroy()
{
	ip -6 route del default vrf v$h2 nexthop via 2001:db8:2::2
	ip -4 route del default vrf v$h2 nexthop via 198.51.100.2

	simple_if_fini $h2 198.51.100.1/24 2001:db8:2::1/64
}

router_create()
{
	ip link set dev $rp1 up
	ip link set dev $rp2 up

	tc qdisc add dev $rp2 clsact

	__addr_add_del $rp1 add 192.0.2.2/24 2001:db8:1::2/64
	__addr_add_del $rp2 add 198.51.100.2/24 2001:db8:2::2/64
}

router_destroy()
{
	__addr_add_del $rp2 del 198.51.100.2/24 2001:db8:2::2/64
	__addr_add_del $rp1 del 192.0.2.2/24 2001:db8:1::2/64

	tc qdisc del dev $rp2 clsact
}

setup_prepare()
{
	h1=${NETIFS[p1]}
	rp1=${NETIFS[p2]}

	rp2=${NETIFS[p3]}
	h2=${NETIFS[p4]}

	rp1mac=$(mac_get $rp1)

	start_mcd

	vrf_prepare
	forwarding_enable

	h1_create
	h2_create

	router_create
}

cleanup()
{
	pre_cleanup

	router_destroy

	h2_destroy
	h1_destroy

	forwarding_restore
	vrf_cleanup

	kill_mcd
}

ping_check()
{
	ping_do $h1 198.51.100.1
	check_err $? "Packets that should not be trapped were trapped"
}

trap_action_check()
{
	local trap_name=$1; shift
	local expected_action=$1; shift

	action=$(devlink_trap_action_get $trap_name)
	if [ "$action" != $expected_action ]; then
		check_err 1 "Trap $trap_name has wrong action: $action"
	fi
}

mtu_value_is_too_small_test()
{
	local trap_name="mtu_value_is_too_small"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	# type - Destination Unreachable
	# code - Fragmentation Needed and Don't Fragment was Set
	tc filter add dev $h1 ingress protocol ip pref 1 handle 101 \
		flower skip_hw ip_proto icmp type 3 code 4 action pass

	mtu_set $rp2 1300

	# Generate IP packets bigger than router's MTU with don't fragment
	# flag on.
	$MZ $h1 -t udp "sp=54321,dp=12345,df" -p 1400 -c 0 -d 1msec -b $rp1mac \
		-B 198.51.100.1 -q &
	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	tc_check_packets_hitting "dev $h1 ingress" 101
	check_err $? "Packets were not received to h1"

	log_test "MTU value is too small"

	mtu_restore $rp2

	kill $mz_pid && wait $mz_pid &> /dev/null
	tc filter del dev $h1 ingress protocol ip pref 1 handle 101 flower
}

__ttl_value_is_too_small_test()
{
	local ttl_val=$1; shift
	local trap_name="ttl_value_is_too_small"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	# type - Time Exceeded
	# code - Time to Live exceeded in Transit
	tc filter add dev $h1 ingress protocol ip pref 1 handle 101 \
		 flower skip_hw ip_proto icmp type 11 code 0 action pass

	# Generate IP packets with small TTL
	$MZ $h1 -t udp "ttl=$ttl_val,sp=54321,dp=12345" -c 0 -d 1msec \
		-b $rp1mac -B 198.51.100.1 -q &
	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	tc_check_packets_hitting "dev $h1 ingress" 101
	check_err $? "Packets were not received to h1"

	log_test "TTL value is too small: TTL=$ttl_val"

	kill $mz_pid && wait $mz_pid &> /dev/null
	tc filter del dev $h1 ingress protocol ip pref 1 handle 101 flower
}

ttl_value_is_too_small_test()
{
	__ttl_value_is_too_small_test 0
	__ttl_value_is_too_small_test 1
}

start_mcd()
{
	SMCROUTEDIR="$(mktemp -d)"
	for ((i = 1; i <= $NUM_NETIFS; ++i)); do
		 echo "phyint ${NETIFS[p$i]} enable" >> \
			 $SMCROUTEDIR/$table_name.conf
	done

	$MCD -N -I $table_name -f $SMCROUTEDIR/$table_name.conf \
		-P $SMCROUTEDIR/$table_name.pid
}

kill_mcd()
{
	pkill $MCD
	rm -rf $SMCROUTEDIR
}

__mc_reverse_path_forwarding_test()
{
	local desc=$1; shift
	local src_ip=$1; shift
	local dst_ip=$1; shift
	local dst_mac=$1; shift
	local proto=$1; shift
	local flags=${1:-""}; shift
	local trap_name="mc_reverse_path_forwarding"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	tc filter add dev $rp2 egress protocol $proto pref 1 handle 101 \
		flower dst_ip $dst_ip ip_proto udp action drop

	$MC_CLI -I $table_name add $rp1 $src_ip $dst_ip $rp2

	# Generate packets to multicast address.
	$MZ $h2 $flags -t udp "sp=54321,dp=12345" -c 0 -p 128 \
		-a 00:11:22:33:44:55 -b $dst_mac \
		-A $src_ip -B $dst_ip -q &

	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	tc_check_packets "dev $rp2 egress" 101 0
	check_err $? "Packets were not dropped"

	log_test "Multicast reverse path forwarding: $desc"

	kill $mz_pid && wait $mz_pid &> /dev/null
	tc filter del dev $rp2 egress protocol $proto pref 1 handle 101 flower
}

mc_reverse_path_forwarding_test()
{
	__mc_reverse_path_forwarding_test "IPv4" "192.0.2.1" "225.1.2.3" \
		"01:00:5e:01:02:03" "ip"
	__mc_reverse_path_forwarding_test "IPv6" "2001:db8:1::1" "ff0e::3" \
		"33:33:00:00:00:03" "ipv6" "-6"
}

__reject_route_test()
{
	local desc=$1; shift
	local dst_ip=$1; shift
	local proto=$1; shift
	local ip_proto=$1; shift
	local type=$1; shift
	local code=$1; shift
	local unreachable=$1; shift
	local flags=${1:-""}; shift
	local trap_name="reject_route"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	tc filter add dev $h1 ingress protocol $proto pref 1 handle 101 flower \
		skip_hw ip_proto $ip_proto type $type code $code action pass

	ip route add unreachable $unreachable

	# Generate pacekts to h2. The destination IP is unreachable.
	$MZ $flags $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
		-B $dst_ip -q &
	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	tc_check_packets_hitting "dev $h1 ingress" 101
	check_err $? "ICMP packet was not received to h1"

	log_test "Reject route: $desc"

	kill $mz_pid && wait $mz_pid &> /dev/null
	ip route del unreachable $unreachable
	tc filter del dev $h1 ingress protocol $proto pref 1 handle 101 flower
}

reject_route_test()
{
	# type - Destination Unreachable
	# code - Host Unreachable
	__reject_route_test "IPv4" 198.51.100.1 "ip" "icmp" 3 1 \
		"198.51.100.0/26"
	# type - Destination Unreachable
	# code - No Route
	__reject_route_test "IPv6" 2001:db8:2::1 "ipv6" "icmpv6" 1 0 \
		"2001:db8:2::0/66" "-6"
}

__host_miss_test()
{
	local desc=$1; shift
	local dip=$1; shift
	local trap_name="unresolved_neigh"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	ip neigh flush dev $rp2

	t0_packets=$(devlink_trap_rx_packets_get $trap_name)

	# Generate packets to h2 (will incur a unresolved neighbor).
	# The ping should pass and devlink counters should be increased.
	ping_do $h1 $dip
	check_err $? "ping failed: $desc"

	t1_packets=$(devlink_trap_rx_packets_get $trap_name)

	if [[ $t0_packets -eq $t1_packets ]]; then
		check_err 1 "Trap counter did not increase"
	fi

	log_test "Unresolved neigh: host miss: $desc"
}

__invalid_nexthop_test()
{
	local desc=$1; shift
	local dip=$1; shift
	local extra_add=$1; shift
	local subnet=$1; shift
	local via_add=$1; shift
	local trap_name="unresolved_neigh"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	ip address add $extra_add/$subnet dev $h2

	# Check that correct route does not trigger unresolved_neigh
	ip $flags route add $dip via $extra_add dev $rp2

	# Generate packets in order to discover all neighbours.
	# Without it, counters of unresolved_neigh will be increased
	# during neighbours discovery and the check below will fail
	# for a wrong reason
	ping_do $h1 $dip

	t0_packets=$(devlink_trap_rx_packets_get $trap_name)
	ping_do $h1 $dip
	t1_packets=$(devlink_trap_rx_packets_get $trap_name)

	if [[ $t0_packets -ne $t1_packets ]]; then
		check_err 1 "Trap counter increased when it should not"
	fi

	ip $flags route del $dip via $extra_add dev $rp2

	# Check that route to nexthop that does not exist trigger
	# unresolved_neigh
	ip $flags route add $dip via $via_add dev $h2

	t0_packets=$(devlink_trap_rx_packets_get $trap_name)
	ping_do $h1 $dip
	t1_packets=$(devlink_trap_rx_packets_get $trap_name)

	if [[ $t0_packets -eq $t1_packets ]]; then
		check_err 1 "Trap counter did not increase"
	fi

	ip $flags route del $dip via $via_add dev $h2
	ip address del $extra_add/$subnet dev $h2
	log_test "Unresolved neigh: nexthop does not exist: $desc"
}

unresolved_neigh_test()
{
	__host_miss_test "IPv4" 198.51.100.1
	__host_miss_test "IPv6" 2001:db8:2::1
	__invalid_nexthop_test "IPv4" 198.51.100.1 198.51.100.3 24 198.51.100.4
	__invalid_nexthop_test "IPv6" 2001:db8:2::1 2001:db8:2::3 64 \
		2001:db8:2::4
}

vrf_without_routes_create()
{
	# VRF creating makes the links to be down and then up again.
	# By default, IPv6 address is not saved after link becomes down.
	# Save IPv6 address using sysctl configuration.
	sysctl_set net.ipv6.conf.$rp1.keep_addr_on_down 1
	sysctl_set net.ipv6.conf.$rp2.keep_addr_on_down 1

	ip link add dev vrf1 type vrf table 101
	ip link set dev $rp1 master vrf1
	ip link set dev $rp2 master vrf1
	ip link set dev vrf1 up

	# Wait for rp1 and rp2 to be up
	setup_wait
}

vrf_without_routes_destroy()
{
	ip link set dev $rp1 nomaster
	ip link set dev $rp2 nomaster
	ip link del dev vrf1

	sysctl_restore net.ipv6.conf.$rp2.keep_addr_on_down
	sysctl_restore net.ipv6.conf.$rp1.keep_addr_on_down

	# Wait for interfaces to be up
	setup_wait
}

ipv4_lpm_miss_test()
{
	local trap_name="ipv4_lpm_miss"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	# Create a VRF without a default route
	vrf_without_routes_create

	# Generate packets through a VRF without a matching route.
	$MZ $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
		-B 203.0.113.1 -q &
	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	log_test "LPM miss: IPv4"

	kill $mz_pid && wait $mz_pid &> /dev/null
	vrf_without_routes_destroy
}

ipv6_lpm_miss_test()
{
	local trap_name="ipv6_lpm_miss"
	local group_name="l3_drops"
	local expected_action="trap"
	local mz_pid

	RET=0

	ping_check $trap_name
	trap_action_check $trap_name $expected_action

	# Create a VRF without a default route
	vrf_without_routes_create

	# Generate packets through a VRF without a matching route.
	$MZ -6 $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
		-B 2001:db8::1 -q &
	mz_pid=$!

	devlink_trap_exception_test $trap_name $group_name

	log_test "LPM miss: IPv6"

	kill $mz_pid && wait $mz_pid &> /dev/null
	vrf_without_routes_destroy
}

trap cleanup EXIT

setup_prepare
setup_wait

tests_run

exit $EXIT_STATUS