selftests: forwarding: tc_flower_l2_miss: Fix failing test with old libnet

As explained in commit 8bcfb4ae4d97 ("selftests: forwarding: Fix failing
tests with old libnet"), old versions of libnet (used by mausezahn) do
not use the "SO_BINDTODEVICE" socket option. For IP unicast packets,
this can be solved by prefixing mausezahn invocations with "ip vrf
exec". However, IP multicast packets do not perform routing and simply
egress the bound device, which does not exist in this case.

Fix by specifying the source and destination MAC of the packet which
will cause mausezahn to use a packet socket instead of an IP socket.

Fixes: 8c33266ae26a ("selftests: forwarding: Add layer 2 miss test cases")
Reported-by: Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>
Closes: https://lore.kernel.org/netdev/adc5e40d-d040-a65e-eb26-edf47dac5b02@alu.unizg.hr/
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://lore.kernel.org/r/20230808141503.4060661-15-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/forwarding/tc_flower_l2_miss.sh b/tools/testing/selftests/net/forwarding/tc_flower_l2_miss.sh
index e22c2d28b6ebf385dc320975bfd1f863b563a447..20a7cb7222b8baa4062a769f2f0d27daf2b00cfd 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/tc_flower_l2_miss.sh
+++ b/tools/testing/selftests/net/forwarding/tc_flower_l2_miss.sh
@@ -127,6 +127,7 @@ test_l2_miss_multicast_common()
        local proto=$1; shift
        local sip=$1; shift
        local dip=$1; shift
+       local dmac=$1; shift
        local mode=$1; shift
        local name=$1; shift
 
@@ -142,7 +143,7 @@ test_l2_miss_multicast_common()
           action pass
 
        # Before adding MDB entry.
-       $MZ $mode $h1 -t ip -A $sip -B $dip -c 1 -p 100 -q
+       $MZ $mode $h1 -a own -b $dmac -t ip -A $sip -B $dip -c 1 -p 100 -q
 
        tc_check_packets "dev $swp2 egress" 101 1
        check_err $? "Unregistered multicast filter was not hit before adding MDB entry"
@@ -153,7 +154,7 @@ test_l2_miss_multicast_common()
        # Adding MDB entry.
        bridge mdb replace dev br1 port $swp2 grp $dip permanent
 
-       $MZ $mode $h1 -t ip -A $sip -B $dip -c 1 -p 100 -q
+       $MZ $mode $h1 -a own -b $dmac -t ip -A $sip -B $dip -c 1 -p 100 -q
 
        tc_check_packets "dev $swp2 egress" 101 1
        check_err $? "Unregistered multicast filter was hit after adding MDB entry"
@@ -164,7 +165,7 @@ test_l2_miss_multicast_common()
        # Deleting MDB entry.
        bridge mdb del dev br1 port $swp2 grp $dip
 
-       $MZ $mode $h1 -t ip -A $sip -B $dip -c 1 -p 100 -q
+       $MZ $mode $h1 -a own -b $dmac -t ip -A $sip -B $dip -c 1 -p 100 -q
 
        tc_check_packets "dev $swp2 egress" 101 2
        check_err $? "Unregistered multicast filter was not hit after deleting MDB entry"
@@ -183,10 +184,11 @@ test_l2_miss_multicast_ipv4()
        local proto="ipv4"
        local sip=192.0.2.1
        local dip=239.1.1.1
+       local dmac=01:00:5e:01:01:01
        local mode="-4"
        local name="IPv4"
 
-       test_l2_miss_multicast_common $proto $sip $dip $mode $name
+       test_l2_miss_multicast_common $proto $sip $dip $dmac $mode $name
 }
 
 test_l2_miss_multicast_ipv6()
@@ -194,10 +196,11 @@ test_l2_miss_multicast_ipv6()
        local proto="ipv6"
        local sip=2001:db8:1::1
        local dip=ff0e::1
+       local dmac=33:33:00:00:00:01
        local mode="-6"
        local name="IPv6"
 
-       test_l2_miss_multicast_common $proto $sip $dip $mode $name
+       test_l2_miss_multicast_common $proto $sip $dip $dmac $mode $name
 }
 
 test_l2_miss_multicast()