xfail_on_veth() for this test is an incorrect approximation which gives false positives and false negatives.
When local_termination fails with "reception succeeded, but should have failed", it is because the DUT ($h2) accepts packets even when not configured as promiscuous. This is not something specific to veth; even the bridge behaves that way, but this is not captured by the xfail_on_veth test.
The IFF_UNICAST_FLT flag is not explicitly exported to user space, but it can somewhat be determined from the interface's behavior. We have to create a macvlan upper with a different MAC address. This forces a dev_uc_add() call in the kernel. When the unicast filtering list is not empty, but the device doesn't support IFF_UNICAST_FLT, __dev_set_rx_mode() force-enables promiscuity on the interface, to ensure correct behavior (that the requested address is received).
We can monitor the change in the promiscuity flag and infer from it whether the device supports unicast filtering.
There is no equivalent thing for allmulti, unfortunately. We never know what's hiding behind a device which has allmulti=off. Whether it will actually perform RX multicast filtering of unknown traffic is a strong "maybe". The bridge driver, for example, completely ignores the flag. We'll have to keep the xfail behavior, but instead of XFAIL on just veth, always XFAIL.
Signed-off-by: Vladimir Oltean vladimir.oltean@nxp.com --- tools/testing/selftests/net/forwarding/lib.sh | 57 ++++++++++++++++++ .../net/forwarding/local_termination.sh | 58 ++++++++++++++----- 2 files changed, 99 insertions(+), 16 deletions(-)
diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh index cb0fcd6f0293..c992e385159c 100644 --- a/tools/testing/selftests/net/forwarding/lib.sh +++ b/tools/testing/selftests/net/forwarding/lib.sh @@ -500,6 +500,11 @@ check_err_fail() fi }
+xfail() +{ + FAIL_TO_XFAIL=yes "$@" +} + xfail_on_slow() { if [[ $KSFT_MACHINE_SLOW = yes ]]; then @@ -1120,6 +1125,39 @@ mac_get() ip -j link show dev $if_name | jq -r '.[]["address"]' }
+ether_addr_to_u64() +{ + local addr="$1" + local order="$((1 << 40))" + local val=0 + local byte + + addr="${addr//:/ }" + + for byte in $addr; do + byte="0x$byte" + val=$((val + order * byte)) + order=$((order >> 8)) + done + + printf "0x%x" $val +} + +u64_to_ether_addr() +{ + local val=$1 + local byte + local i + + for ((i = 40; i >= 0; i -= 8)); do + byte=$(((val & (0xff << i)) >> i)) + printf "%02x" $byte + if [ $i -ne 0 ]; then + printf ":" + fi + done +} + ipv6_lladdr_get() { local if_name=$1 @@ -2236,3 +2274,22 @@ absval()
echo $((v > 0 ? v : -v)) } + +has_unicast_flt() +{ + local dev=$1; shift + local mac_addr=$(mac_get $dev) + local tmp=$(ether_addr_to_u64 $mac_addr) + local promisc + + ip link set $dev up + ip link add link $dev name macvlan-tmp type macvlan mode private + ip link set macvlan-tmp address $(u64_to_ether_addr $((tmp + 1))) + ip link set macvlan-tmp up + + promisc=$(ip -j -d link show dev $dev | jq -r '.[].promiscuity') + + ip link del macvlan-tmp + + [[ $promisc == 1 ]] && echo "no" || echo "yes" +} diff --git a/tools/testing/selftests/net/forwarding/local_termination.sh b/tools/testing/selftests/net/forwarding/local_termination.sh index e22c6a693bef..80ea4c10d764 100755 --- a/tools/testing/selftests/net/forwarding/local_termination.sh +++ b/tools/testing/selftests/net/forwarding/local_termination.sh @@ -109,9 +109,11 @@ run_test() { local send_if_name=$1; shift local rcv_if_name=$1; shift + local no_unicast_flt=$1; shift local test_name="$1"; shift local smac=$(mac_get $send_if_name) local rcv_dmac=$(mac_get $rcv_if_name) + local should_receive
tcpdump_start $rcv_if_name
@@ -160,26 +162,26 @@ run_test() "$smac > $MACVLAN_ADDR, ethertype IPv4 (0x0800)" \ true "$test_name"
- xfail_on_veth $h1 \ - check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \ - "$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \ - false "$test_name" + [ $no_unicast_flt = true ] && should_receive=true || should_receive=false + check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \ + "$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \ + $should_receive "$test_name"
check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address, promisc" \ "$smac > $UNKNOWN_UC_ADDR2, ethertype IPv4 (0x0800)" \ true "$test_name"
- xfail_on_veth $h1 \ - check_rcv $rcv_if_name \ - "Unicast IPv4 to unknown MAC address, allmulti" \ - "$smac > $UNKNOWN_UC_ADDR3, ethertype IPv4 (0x0800)" \ - false "$test_name" + [ $no_unicast_flt = true ] && should_receive=true || should_receive=false + check_rcv $rcv_if_name \ + "Unicast IPv4 to unknown MAC address, allmulti" \ + "$smac > $UNKNOWN_UC_ADDR3, ethertype IPv4 (0x0800)" \ + $should_receive "$test_name"
check_rcv $rcv_if_name "Multicast IPv4 to joined group" \ "$smac > $JOINED_MACV4_MC_ADDR, ethertype IPv4 (0x0800)" \ true "$test_name"
- xfail_on_veth $h1 \ + xfail \ check_rcv $rcv_if_name \ "Multicast IPv4 to unknown group" \ "$smac > $UNKNOWN_MACV4_MC_ADDR1, ethertype IPv4 (0x0800)" \ @@ -197,7 +199,7 @@ run_test() "$smac > $JOINED_MACV6_MC_ADDR, ethertype IPv6 (0x86dd)" \ true "$test_name"
- xfail_on_veth $h1 \ + xfail \ check_rcv $rcv_if_name "Multicast IPv6 to unknown group" \ "$smac > $UNKNOWN_MACV6_MC_ADDR1, ethertype IPv6 (0x86dd)" \ false "$test_name" @@ -290,11 +292,17 @@ macvlan_destroy()
standalone() { + local no_unicast_flt=true + + if [ $(has_unicast_flt $h2) = yes ]; then + no_unicast_flt=false + fi + h1_create h2_create macvlan_create $h2
- run_test $h1 $h2 "$h2" + run_test $h1 $h2 $no_unicast_flt "$h2"
macvlan_destroy h2_destroy @@ -303,6 +311,7 @@ standalone()
test_bridge() { + local no_unicast_flt=true local vlan_filtering=$1
h1_create @@ -310,7 +319,7 @@ test_bridge() simple_if_init br0 $H2_IPV4/24 $H2_IPV6/64 macvlan_create br0
- run_test $h1 br0 "vlan_filtering=$vlan_filtering bridge" + run_test $h1 br0 $no_unicast_flt "vlan_filtering=$vlan_filtering bridge"
macvlan_destroy simple_if_fini br0 $H2_IPV4/24 $H2_IPV6/64 @@ -330,11 +339,17 @@ vlan_aware_bridge()
test_vlan() { + local no_unicast_flt=true + + if [ $(has_unicast_flt $h2) = yes ]; then + no_unicast_flt=false + fi + h1_vlan_create h2_vlan_create macvlan_create $h2.100
- run_test $h1.100 $h2.100 "VLAN upper" + run_test $h1.100 $h2.100 $no_unicast_flt "VLAN upper"
macvlan_destroy h2_vlan_destroy @@ -343,14 +358,23 @@ test_vlan()
vlan_over_bridged_port() { + local no_unicast_flt=true local vlan_filtering=$1
+ # br_manage_promisc() will not force a single vlan_filtering port to + # promiscuous mode, so we should still expect unicast filtering to take + # place if the device can do it. + if [ $(has_unicast_flt $h2) = yes ] && [ $vlan_filtering = 1 ]; then + no_unicast_flt=false + fi + h1_vlan_create h2_vlan_create bridge_create $vlan_filtering macvlan_create $h2.100
- run_test $h1.100 $h2.100 "VLAN over vlan_filtering=$vlan_filtering bridged port" + run_test $h1.100 $h2.100 $no_unicast_flt \ + "VLAN over vlan_filtering=$vlan_filtering bridged port"
macvlan_destroy bridge_destroy @@ -370,6 +394,7 @@ vlan_over_vlan_aware_bridged_port()
vlan_over_bridge() { + local no_unicast_flt=true local vlan_filtering=$1
h1_vlan_create @@ -383,7 +408,8 @@ vlan_over_bridge() bridge vlan add dev br0 vid 100 self fi
- run_test $h1.100 br0.100 "VLAN over vlan_filtering=$vlan_filtering bridge" + run_test $h1.100 br0.100 $no_unicast_flt \ + "VLAN over vlan_filtering=$vlan_filtering bridge"
if [ $vlan_filtering = 1 ]; then bridge vlan del dev br0 vid 100 self