selftests: devlink_trap_tunnel_vxlan: Add test case for decap_error

Test that the trap is triggered under the right conditions and that
devlink counters increase.
Signed-off-by: Amit Cohen <amitc@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/devlink_trap_tunnel_vxlan.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Test devlink-trap tunnel drops and exceptions functionality over mlxsw.
+# Check all traps to make sure they are triggered under the right
+# conditions.
+
+# +--------------------+
+# | H1 (vrf)           |
+# |    + $h1           |
+# |    | 192.0.2.1/28  |
+# +----|---------------+
+#      |
+# +----|----------------------------------------------------------------------+
+# | SW |                                                                      |
+# | +--|--------------------------------------------------------------------+ |
+# | |  + $swp1                   BR1 (802.1d)                               | |
+# | |                                                                       | |
+# | |  + vx1 (vxlan)                                                        | |
+# | |    local 192.0.2.17                                                   | |
+# | |    id 1000 dstport $VXPORT                                            | |
+# | +-----------------------------------------------------------------------+ |
+# |                                                                           |
+# |    + $rp1                                                                 |
+# |    | 192.0.2.17/28                                                        |
+# +----|----------------------------------------------------------------------+
+#      |
+# +----|--------------------------------------------------------+
+# |    |                                             VRF2       |
+# |    + $rp2                                                   |
+# |      192.0.2.18/28                                          |
+# |                                                             |
+# +-------------------------------------------------------------+
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+	decap_error_test
+"
+
+NUM_NETIFS=4
+source $lib_dir/lib.sh
+source $lib_dir/tc_common.sh
+source $lib_dir/devlink_lib.sh
+
+: ${VXPORT:=4789}
+export VXPORT
+
+h1_create()
+{
+	simple_if_init $h1 192.0.2.1/28
+}
+
+h1_destroy()
+{
+	simple_if_fini $h1 192.0.2.1/28
+}
+
+switch_create()
+{
+	ip link add name br1 type bridge vlan_filtering 0 mcast_snooping 0
+	# Make sure the bridge uses the MAC address of the local port and not
+	# that of the VxLAN's device.
+	ip link set dev br1 address $(mac_get $swp1)
+	ip link set dev br1 up
+
+	tc qdisc add dev $swp1 clsact
+	ip link set dev $swp1 master br1
+	ip link set dev $swp1 up
+
+	ip link add name vx1 type vxlan id 1000 local 192.0.2.17 \
+		dstport "$VXPORT" nolearning noudpcsum tos inherit ttl 100
+	ip link set dev vx1 master br1
+	ip link set dev vx1 up
+
+	ip address add dev $rp1 192.0.2.17/28
+	ip link set dev $rp1 up
+}
+
+switch_destroy()
+{
+	ip link set dev $rp1 down
+	ip address del dev $rp1 192.0.2.17/28
+
+	ip link set dev vx1 down
+	ip link set dev vx1 nomaster
+	ip link del dev vx1
+
+	ip link set dev $swp1 down
+	ip link set dev $swp1 nomaster
+	tc qdisc del dev $swp1 clsact
+
+	ip link set dev br1 down
+	ip link del dev br1
+}
+
+vrf2_create()
+{
+	simple_if_init $rp2 192.0.2.18/28
+}
+
+vrf2_destroy()
+{
+	simple_if_fini $rp2 192.0.2.18/28
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	rp1=${NETIFS[p3]}
+	rp2=${NETIFS[p4]}
+
+	vrf_prepare
+	forwarding_enable
+	h1_create
+	switch_create
+	vrf2_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	vrf2_destroy
+	switch_destroy
+	h1_destroy
+	forwarding_restore
+	vrf_cleanup
+}
+
+ecn_payload_get()
+{
+	dest_mac=$(mac_get $h1)
+	p=$(:
+		)"08:"$(                      : VXLAN flags
+		)"00:00:00:"$(                : VXLAN reserved
+		)"00:03:e8:"$(                : VXLAN VNI : 1000
+		)"00:"$(                      : VXLAN reserved
+		)"$dest_mac:"$(               : ETH daddr
+		)"00:00:00:00:00:00:"$(       : ETH saddr
+		)"08:00:"$(                   : ETH type
+		)"45:"$(                      : IP version + IHL
+		)"00:"$(                      : IP TOS
+		)"00:14:"$(                   : IP total length
+		)"00:00:"$(                   : IP identification
+		)"20:00:"$(                   : IP flags + frag off
+		)"40:"$(                      : IP TTL
+		)"00:"$(                      : IP proto
+		)"D6:E5:"$(                   : IP header csum
+		)"c0:00:02:03:"$(             : IP saddr: 192.0.2.3
+		)"c0:00:02:01:"$(             : IP daddr: 192.0.2.1
+		)
+	echo $p
+}
+
+ecn_decap_test()
+{
+	local trap_name="decap_error"
+	local group_name="tunnel_drops"
+	local desc=$1; shift
+	local ecn_desc=$1; shift
+	local outer_tos=$1; shift
+	local mz_pid
+
+	RET=0
+
+	tc filter add dev $swp1 egress protocol ip pref 1 handle 101 \
+		flower src_ip 192.0.2.3 dst_ip 192.0.2.1 action pass
+
+	rp1_mac=$(mac_get $rp1)
+	payload=$(ecn_payload_get)
+
+	ip vrf exec v$rp2 $MZ $rp2 -c 0 -d 1msec -b $rp1_mac -B 192.0.2.17 \
+		-t udp sp=12345,dp=$VXPORT,tos=$outer_tos,p=$payload -q &
+	mz_pid=$!
+
+	devlink_trap_exception_test $trap_name $group_name
+
+	tc_check_packets "dev $swp1 egress" 101 0
+	check_err $? "Packets were not dropped"
+
+	log_test "$desc: Inner ECN is not ECT and outer is $ecn_desc"
+
+	kill $mz_pid && wait $mz_pid &> /dev/null
+	tc filter del dev $swp1 egress protocol ip pref 1 handle 101 flower
+}
+
+reserved_bits_payload_get()
+{
+	dest_mac=$(mac_get $h1)
+	p=$(:
+		)"08:"$(                      : VXLAN flags
+		)"01:00:00:"$(                : VXLAN reserved
+		)"00:03:e8:"$(                : VXLAN VNI : 1000
+		)"00:"$(                      : VXLAN reserved
+		)"$dest_mac:"$(               : ETH daddr
+		)"00:00:00:00:00:00:"$(       : ETH saddr
+		)"08:00:"$(                   : ETH type
+		)"45:"$(                      : IP version + IHL
+		)"00:"$(                      : IP TOS
+		)"00:14:"$(                   : IP total length
+		)"00:00:"$(                   : IP identification
+		)"20:00:"$(                   : IP flags + frag off
+		)"40:"$(                      : IP TTL
+		)"00:"$(                      : IP proto
+		)"00:00:"$(                   : IP header csum
+		)"c0:00:02:03:"$(             : IP saddr: 192.0.2.3
+		)"c0:00:02:01:"$(             : IP daddr: 192.0.2.1
+		)
+	echo $p
+}
+
+short_payload_get()
+{
+        dest_mac=$(mac_get $h1)
+        p=$(:
+		)"08:"$(                      : VXLAN flags
+		)"01:00:00:"$(                : VXLAN reserved
+		)"00:03:e8:"$(                : VXLAN VNI : 1000
+		)"00:"$(                      : VXLAN reserved
+		)
+        echo $p
+}
+
+corrupted_packet_test()
+{
+	local trap_name="decap_error"
+	local group_name="tunnel_drops"
+	local desc=$1; shift
+	local payload_get=$1; shift
+	local mz_pid
+
+	RET=0
+
+	# In case of too short packet, there is no any inner packet,
+	# so the matching will always succeed
+	tc filter add dev $swp1 egress protocol ip pref 1 handle 101 \
+		flower skip_hw src_ip 192.0.2.3 dst_ip 192.0.2.1 action pass
+
+	rp1_mac=$(mac_get $rp1)
+	payload=$($payload_get)
+	ip vrf exec v$rp2 $MZ $rp2 -c 0 -d 1msec -b $rp1_mac \
+		-B 192.0.2.17 -t udp sp=12345,dp=$VXPORT,p=$payload -q &
+	mz_pid=$!
+
+	devlink_trap_exception_test $trap_name $group_name
+
+	tc_check_packets "dev $swp1 egress" 101 0
+	check_err $? "Packets were not dropped"
+
+	log_test "$desc"
+
+	kill $mz_pid && wait $mz_pid &> /dev/null
+	tc filter del dev $swp1 egress protocol ip pref 1 handle 101 flower
+}
+
+decap_error_test()
+{
+	ecn_decap_test "Decap error" "ECT(1)" 01
+	ecn_decap_test "Decap error" "ECT(0)" 02
+	ecn_decap_test "Decap error" "CE" 03
+
+	corrupted_packet_test "Decap error: Reserved bits in use" \
+		"reserved_bits_payload_get"
+	corrupted_packet_test "Decap error: No L2 header" "short_payload_get"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+tests_run
+
+exit $EXIT_STATUS