selftests: forwarding: add a test for local_termination.sh

This tests the capability of switch ports to filter out undesired
traffic. Different drivers are expected to have different capabilities
here (so some may fail and some may pass), yet the test still has some
value, for example to check for regressions.

There are 2 kinds of failures, one is when a packet which should have
been accepted isn't (and that should be fixed), and the other "failure"
(as reported by the test) is when a packet could have been filtered out
(for being unnecessary) yet it was received.

The bridge driver fares particularly badly at this test:

TEST: br0: Unicast IPv4 to primary MAC address                      [ OK ]
TEST: br0: Unicast IPv4 to macvlan MAC address                      [ OK ]
TEST: br0: Unicast IPv4 to unknown MAC address                      [FAIL]
        reception succeeded, but should have failed
TEST: br0: Unicast IPv4 to unknown MAC address, promisc             [ OK ]
TEST: br0: Unicast IPv4 to unknown MAC address, allmulti            [FAIL]
        reception succeeded, but should have failed
TEST: br0: Multicast IPv4 to joined group                           [ OK ]
TEST: br0: Multicast IPv4 to unknown group                          [FAIL]
        reception succeeded, but should have failed
TEST: br0: Multicast IPv4 to unknown group, promisc                 [ OK ]
TEST: br0: Multicast IPv4 to unknown group, allmulti                [ OK ]
TEST: br0: Multicast IPv6 to joined group                           [ OK ]
TEST: br0: Multicast IPv6 to unknown group                          [FAIL]
        reception succeeded, but should have failed
TEST: br0: Multicast IPv6 to unknown group, promisc                 [ OK ]
TEST: br0: Multicast IPv6 to unknown group, allmulti                [ OK ]

mainly because it does not implement IFF_UNICAST_FLT. Yet I still think
having the test (with the failures) is useful in case somebody wants to
tackle that problem in the future, to make an easy before-and-after
comparison.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/forwarding/local_termination.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ALL_TESTS="standalone bridge"
+NUM_NETIFS=2
+PING_COUNT=1
+REQUIRE_MTOOLS=yes
+REQUIRE_MZ=no
+
+source lib.sh
+
+H1_IPV4="192.0.2.1"
+H2_IPV4="192.0.2.2"
+H1_IPV6="2001:db8:1::1"
+H2_IPV6="2001:db8:1::2"
+
+BRIDGE_ADDR="00:00:de:ad:be:ee"
+MACVLAN_ADDR="00:00:de:ad:be:ef"
+UNKNOWN_UC_ADDR1="de:ad:be:ef:ee:03"
+UNKNOWN_UC_ADDR2="de:ad:be:ef:ee:04"
+UNKNOWN_UC_ADDR3="de:ad:be:ef:ee:05"
+JOINED_IPV4_MC_ADDR="225.1.2.3"
+UNKNOWN_IPV4_MC_ADDR1="225.1.2.4"
+UNKNOWN_IPV4_MC_ADDR2="225.1.2.5"
+UNKNOWN_IPV4_MC_ADDR3="225.1.2.6"
+JOINED_IPV6_MC_ADDR="ff2e::0102:0304"
+UNKNOWN_IPV6_MC_ADDR1="ff2e::0102:0305"
+UNKNOWN_IPV6_MC_ADDR2="ff2e::0102:0306"
+UNKNOWN_IPV6_MC_ADDR3="ff2e::0102:0307"
+
+JOINED_MACV4_MC_ADDR="01:00:5e:01:02:03"
+UNKNOWN_MACV4_MC_ADDR1="01:00:5e:01:02:04"
+UNKNOWN_MACV4_MC_ADDR2="01:00:5e:01:02:05"
+UNKNOWN_MACV4_MC_ADDR3="01:00:5e:01:02:06"
+JOINED_MACV6_MC_ADDR="33:33:01:02:03:04"
+UNKNOWN_MACV6_MC_ADDR1="33:33:01:02:03:05"
+UNKNOWN_MACV6_MC_ADDR2="33:33:01:02:03:06"
+UNKNOWN_MACV6_MC_ADDR3="33:33:01:02:03:07"
+
+NON_IP_MC="01:02:03:04:05:06"
+NON_IP_PKT="00:04 48:45:4c:4f"
+BC="ff:ff:ff:ff:ff:ff"
+
+# Disable promisc to ensure we don't receive unknown MAC DA packets
+export TCPDUMP_EXTRA_FLAGS="-pl"
+
+h1=${NETIFS[p1]}
+h2=${NETIFS[p2]}
+
+send_non_ip()
+{
+	local if_name=$1
+	local smac=$2
+	local dmac=$3
+
+	$MZ -q $if_name "$dmac $smac $NON_IP_PKT"
+}
+
+send_uc_ipv4()
+{
+	local if_name=$1
+	local dmac=$2
+
+	ip neigh add $H2_IPV4 lladdr $dmac dev $if_name
+	ping_do $if_name $H2_IPV4
+	ip neigh del $H2_IPV4 dev $if_name
+}
+
+check_rcv()
+{
+	local if_name=$1
+	local type=$2
+	local pattern=$3
+	local should_receive=$4
+	local should_fail=
+
+	[ $should_receive = true ] && should_fail=0 || should_fail=1
+	RET=0
+
+	tcpdump_show $if_name | grep -q "$pattern"
+
+	check_err_fail "$should_fail" "$?" "reception"
+
+	log_test "$if_name: $type"
+}
+
+mc_route_prepare()
+{
+	local if_name=$1
+	local vrf_name=$(master_name_get $if_name)
+
+	ip route add 225.100.1.0/24 dev $if_name vrf $vrf_name
+	ip -6 route add ff2e::/64 dev $if_name vrf $vrf_name
+}
+
+mc_route_destroy()
+{
+	local if_name=$1
+	local vrf_name=$(master_name_get $if_name)
+
+	ip route del 225.100.1.0/24 dev $if_name vrf $vrf_name
+	ip -6 route del ff2e::/64 dev $if_name vrf $vrf_name
+}
+
+run_test()
+{
+	local rcv_if_name=$1
+	local smac=$(mac_get $h1)
+	local rcv_dmac=$(mac_get $rcv_if_name)
+
+	tcpdump_start $rcv_if_name
+
+	mc_route_prepare $h1
+	mc_route_prepare $rcv_if_name
+
+	send_uc_ipv4 $h1 $rcv_dmac
+	send_uc_ipv4 $h1 $MACVLAN_ADDR
+	send_uc_ipv4 $h1 $UNKNOWN_UC_ADDR1
+
+	ip link set dev $rcv_if_name promisc on
+	send_uc_ipv4 $h1 $UNKNOWN_UC_ADDR2
+	mc_send $h1 $UNKNOWN_IPV4_MC_ADDR2
+	mc_send $h1 $UNKNOWN_IPV6_MC_ADDR2
+	ip link set dev $rcv_if_name promisc off
+
+	mc_join $rcv_if_name $JOINED_IPV4_MC_ADDR
+	mc_send $h1 $JOINED_IPV4_MC_ADDR
+	mc_leave
+
+	mc_join $rcv_if_name $JOINED_IPV6_MC_ADDR
+	mc_send $h1 $JOINED_IPV6_MC_ADDR
+	mc_leave
+
+	mc_send $h1 $UNKNOWN_IPV4_MC_ADDR1
+	mc_send $h1 $UNKNOWN_IPV6_MC_ADDR1
+
+	ip link set dev $rcv_if_name allmulticast on
+	send_uc_ipv4 $h1 $UNKNOWN_UC_ADDR3
+	mc_send $h1 $UNKNOWN_IPV4_MC_ADDR3
+	mc_send $h1 $UNKNOWN_IPV6_MC_ADDR3
+	ip link set dev $rcv_if_name allmulticast off
+
+	mc_route_destroy $rcv_if_name
+	mc_route_destroy $h1
+
+	sleep 1
+
+	tcpdump_stop $rcv_if_name
+
+	check_rcv $rcv_if_name "Unicast IPv4 to primary MAC address" \
+		"$smac > $rcv_dmac, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Unicast IPv4 to macvlan MAC address" \
+		"$smac > $MACVLAN_ADDR, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
+		"$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
+		false
+
+	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address, promisc" \
+		"$smac > $UNKNOWN_UC_ADDR2, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address, allmulti" \
+		"$smac > $UNKNOWN_UC_ADDR3, ethertype IPv4 (0x0800)" \
+		false
+
+	check_rcv $rcv_if_name "Multicast IPv4 to joined group" \
+		"$smac > $JOINED_MACV4_MC_ADDR, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Multicast IPv4 to unknown group" \
+		"$smac > $UNKNOWN_MACV4_MC_ADDR1, ethertype IPv4 (0x0800)" \
+		false
+
+	check_rcv $rcv_if_name "Multicast IPv4 to unknown group, promisc" \
+		"$smac > $UNKNOWN_MACV4_MC_ADDR2, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Multicast IPv4 to unknown group, allmulti" \
+		"$smac > $UNKNOWN_MACV4_MC_ADDR3, ethertype IPv4 (0x0800)" \
+		true
+
+	check_rcv $rcv_if_name "Multicast IPv6 to joined group" \
+		"$smac > $JOINED_MACV6_MC_ADDR, ethertype IPv6 (0x86dd)" \
+		true
+
+	check_rcv $rcv_if_name "Multicast IPv6 to unknown group" \
+		"$smac > $UNKNOWN_MACV6_MC_ADDR1, ethertype IPv6 (0x86dd)" \
+		false
+
+	check_rcv $rcv_if_name "Multicast IPv6 to unknown group, promisc" \
+		"$smac > $UNKNOWN_MACV6_MC_ADDR2, ethertype IPv6 (0x86dd)" \
+		true
+
+	check_rcv $rcv_if_name "Multicast IPv6 to unknown group, allmulti" \
+		"$smac > $UNKNOWN_MACV6_MC_ADDR3, ethertype IPv6 (0x86dd)" \
+		true
+
+	tcpdump_cleanup $rcv_if_name
+}
+
+h1_create()
+{
+	simple_if_init $h1 $H1_IPV4/24 $H1_IPV6/64
+}
+
+h1_destroy()
+{
+	simple_if_fini $h1 $H1_IPV4/24 $H1_IPV6/64
+}
+
+h2_create()
+{
+	simple_if_init $h2 $H2_IPV4/24 $H2_IPV6/64
+}
+
+h2_destroy()
+{
+	simple_if_fini $h2 $H2_IPV4/24 $H2_IPV6/64
+}
+
+bridge_create()
+{
+	ip link add br0 type bridge
+	ip link set br0 address $BRIDGE_ADDR
+	ip link set br0 up
+
+	ip link set $h2 master br0
+	ip link set $h2 up
+
+	simple_if_init br0 $H2_IPV4/24 $H2_IPV6/64
+}
+
+bridge_destroy()
+{
+	simple_if_fini br0 $H2_IPV4/24 $H2_IPV6/64
+
+	ip link del br0
+}
+
+standalone()
+{
+	h1_create
+	h2_create
+
+	ip link add link $h2 name macvlan0 type macvlan mode private
+	ip link set macvlan0 address $MACVLAN_ADDR
+	ip link set macvlan0 up
+
+	run_test $h2
+
+	ip link del macvlan0
+
+	h2_destroy
+	h1_destroy
+}
+
+bridge()
+{
+	h1_create
+	bridge_create
+
+	ip link add link br0 name macvlan0 type macvlan mode private
+	ip link set macvlan0 address $MACVLAN_ADDR
+	ip link set macvlan0 up
+
+	run_test br0
+
+	ip link del macvlan0
+
+	bridge_destroy
+	h1_destroy
+}
+
+cleanup()
+{
+	pre_cleanup
+	vrf_cleanup
+}
+
+setup_prepare()
+{
+	vrf_prepare
+	# setup_wait() needs this
+	ip link set $h1 up
+	ip link set $h2 up
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS