selftests: devlink_trap_tunnel_ipip: 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>

diff --git a/tools/testing/selftests/drivers/net/mlxsw/devlink_trap_tunnel_ipip.sh b/tools/testing/selftests/drivers/net/mlxsw/devlink_trap_tunnel_ipip.sh
new file mode 100755 (executable)
index 0000000..039629b
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/mlxsw/devlink_trap_tunnel_ipip.sh
@@ -0,0 +1,265 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Test devlink-trap tunnel exceptions functionality over mlxsw.
+# Check all exception traps to make sure they are triggered under the right
+# conditions.
+
+# +-------------------------+
+# | H1                      |
+# |               $h1 +     |
+# |      192.0.2.1/28 |     |
+# +-------------------|-----+
+#                     |
+# +-------------------|-----+
+# | SW1               |     |
+# |              $swp1 +    |
+# |      192.0.2.2/28       |
+# |                         |
+# |  + g1a (gre)            |
+# |    loc=192.0.2.65       |
+# |    rem=192.0.2.66       |
+# |    tos=inherit          |
+# |                         |
+# |  + $rp1                 |
+# |  |  198.51.100.1/28     |
+# +--|----------------------+
+#    |
+# +--|----------------------+
+# |  |                 VRF2 |
+# | + $rp2                  |
+# |   198.51.100.2/28       |
+# +-------------------------+
+
+lib_dir=$(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
+
+h1_create()
+{
+       simple_if_init $h1 192.0.2.1/28
+}
+
+h1_destroy()
+{
+       simple_if_fini $h1 192.0.2.1/28
+}
+
+vrf2_create()
+{
+       simple_if_init $rp2 198.51.100.2/28
+}
+
+vrf2_destroy()
+{
+       simple_if_fini $rp2 198.51.100.2/28
+}
+
+switch_create()
+{
+       __addr_add_del $swp1 add 192.0.2.2/28
+       tc qdisc add dev $swp1 clsact
+       ip link set dev $swp1 up
+
+       tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit
+       __addr_add_del g1 add 192.0.2.65/32
+       ip link set dev g1 up
+
+       __addr_add_del $rp1 add 198.51.100.1/28
+       ip link set dev $rp1 up
+}
+
+switch_destroy()
+{
+       ip link set dev $rp1 down
+       __addr_add_del $rp1 del 198.51.100.1/28
+
+       ip link set dev g1 down
+       __addr_add_del g1 del 192.0.2.65/32
+       tunnel_destroy g1
+
+       ip link set dev $swp1 down
+       tc qdisc del dev $swp1 clsact
+       __addr_add_del $swp1 del 192.0.2.2/28
+}
+
+setup_prepare()
+{
+       h1=${NETIFS[p1]}
+       swp1=${NETIFS[p2]}
+
+       rp1=${NETIFS[p3]}
+       rp2=${NETIFS[p4]}
+
+       forwarding_enable
+       vrf_prepare
+       h1_create
+       switch_create
+       vrf2_create
+}
+
+cleanup()
+{
+       pre_cleanup
+
+       vrf2_destroy
+       switch_destroy
+       h1_destroy
+       vrf_cleanup
+       forwarding_restore
+}
+
+ecn_payload_get()
+{
+       p=$(:
+               )"0"$(                        : GRE flags
+               )"0:00:"$(                    : Reserved + version
+               )"08:00:"$(                   : ETH protocol type
+               )"4"$(                        : IP version
+               )"5:"$(                       : IHL
+               )"00:"$(                      : IP TOS
+               )"00:14:"$(                   : IP total length
+               )"00:00:"$(                   : IP identification
+               )"20:00:"$(                   : IP flags + frag off
+               )"30:"$(                      : IP TTL
+               )"01:"$(                      : IP proto
+               )"E7:E6:"$(                   : IP header csum
+               )"C0:00:01:01:"$(             : IP saddr : 192.0.1.1
+               )"C0:00:02:01:"$(             : 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 $swp1 egress protocol ip pref 1 handle 101 \
+               flower src_ip 192.0.1.1 dst_ip 192.0.2.1 action pass
+
+       rp1_mac=$(mac_get $rp1)
+       rp2_mac=$(mac_get $rp2)
+       payload=$(ecn_payload_get)
+
+       ip vrf exec v$rp2 $MZ $rp2 -c 0 -d 1msec -a $rp2_mac -b $rp1_mac \
+               -A 192.0.2.66 -B 192.0.2.65 -t ip \
+                       len=48,tos=$outer_tos,proto=47,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
+}
+
+ipip_payload_get()
+{
+       local flags=$1; shift
+       local key=$1; shift
+
+       p=$(:
+               )"$flags"$(                   : GRE flags
+               )"0:00:"$(                    : Reserved + version
+               )"08:00:"$(                   : ETH protocol type
+               )"$key"$(                     : Key
+               )"4"$(                        : IP version
+               )"5:"$(                       : IHL
+               )"00:"$(                      : IP TOS
+               )"00:14:"$(                   : IP total length
+               )"00:00:"$(                   : IP identification
+               )"20:00:"$(                   : IP flags + frag off
+               )"30:"$(                      : IP TTL
+               )"01:"$(                      : IP proto
+               )"E7:E6:"$(                   : IP header csum
+               )"C0:00:01:01:"$(             : IP saddr : 192.0.1.1
+               )"C0:00:02:01:"$(             : IP daddr : 192.0.2.1
+               )
+       echo $p
+}
+
+no_matching_tunnel_test()
+{
+       local trap_name="decap_error"
+       local group_name="tunnel_drops"
+       local desc=$1; shift
+       local sip=$1; shift
+       local mz_pid
+
+       RET=0
+
+       tc filter add dev $swp1 egress protocol ip pref 1 handle 101 \
+               flower src_ip 192.0.1.1 dst_ip 192.0.2.1 action pass
+
+       rp1_mac=$(mac_get $rp1)
+       rp2_mac=$(mac_get $rp2)
+       payload=$(ipip_payload_get "$@")
+
+       ip vrf exec v$rp2 $MZ $rp2 -c 0 -d 1msec -a $rp2_mac -b $rp1_mac \
+               -A $sip -B 192.0.2.65 -t ip len=48,proto=47,p=$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()
+{
+       # Correct source IP - the remote address
+       local sip=192.0.2.66
+
+       ecn_decap_test "Decap error" "ECT(1)" 01
+       ecn_decap_test "Decap error" "ECT(0)" 02
+       ecn_decap_test "Decap error" "CE" 03
+
+       no_matching_tunnel_test "Decap error: Source IP check failed" \
+               192.0.2.68 "0"
+       no_matching_tunnel_test \
+               "Decap error: Key exists but was not expected" $sip "2" ":E9:"
+
+       # Destroy the tunnel and create new one with key
+       __addr_add_del g1 del 192.0.2.65/32
+       tunnel_destroy g1
+
+       tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit key 233
+       __addr_add_del g1 add 192.0.2.65/32
+
+       no_matching_tunnel_test \
+               "Decap error: Key does not exist but was expected" $sip "0"
+       no_matching_tunnel_test \
+               "Decap error: Packet has a wrong key field" $sip "2" "E8:"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+tests_run
+
+exit $EXIT_STATUS