[PATCH net 16/17] selftests: forwarding: bridge_mdb_max: Fix failing test with old libnet

[Ido Schimmel <idosch@nvidia.com>]

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: 3446dcd7df05 ("selftests: forwarding: bridge_mdb_max: Add a new selftest")
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>
---
 .../selftests/net/forwarding/bridge_mdb_max.sh     | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh b/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh
index fa762b716288..3da9d93ab36f 100755
--- a/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh
+++ b/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh
@@ -252,7 +252,8 @@ ctl4_entries_add()
 	local IPs=$(seq -f 192.0.2.%g 1 $((n - 1)))
 	local peer=$(locus_dev_peer $locus)
 	local GRP=239.1.1.${grp}
-	$MZ $peer -c 1 -A 192.0.2.1 -B $GRP \
+	local dmac=01:00:5e:01:01:$(printf "%02x" $grp)
+	$MZ $peer -a own -b $dmac -c 1 -A 192.0.2.1 -B $GRP \
 		-t ip proto=2,p=$(igmpv3_is_in_get $GRP $IPs) -q
 	sleep 1
 
@@ -272,7 +273,8 @@ ctl4_entries_del()
 
 	local peer=$(locus_dev_peer $locus)
 	local GRP=239.1.1.${grp}
-	$MZ $peer -c 1 -A 192.0.2.1 -B 224.0.0.2 \
+	local dmac=01:00:5e:00:00:02
+	$MZ $peer -a own -b $dmac -c 1 -A 192.0.2.1 -B 224.0.0.2 \
 		-t ip proto=2,p=$(igmpv2_leave_get $GRP) -q
 	sleep 1
 	! bridge mdb show dev br0 | grep -q $GRP
@@ -289,8 +291,10 @@ ctl6_entries_add()
 	local peer=$(locus_dev_peer $locus)
 	local SIP=fe80::1
 	local GRP=ff0e::${grp}
+	local dmac=33:33:00:00:00:$(printf "%02x" $grp)
 	local p=$(mldv2_is_in_get $SIP $GRP $IPs)
-	$MZ -6 $peer -c 1 -A $SIP -B $GRP -t ip hop=1,next=0,p="$p" -q
+	$MZ -6 $peer -a own -b $dmac -c 1 -A $SIP -B $GRP \
+		-t ip hop=1,next=0,p="$p" -q
 	sleep 1
 
 	local nn=$(bridge mdb show dev br0 | grep $GRP | wc -l)
@@ -310,8 +314,10 @@ ctl6_entries_del()
 	local peer=$(locus_dev_peer $locus)
 	local SIP=fe80::1
 	local GRP=ff0e::${grp}
+	local dmac=33:33:00:00:00:$(printf "%02x" $grp)
 	local p=$(mldv1_done_get $SIP $GRP)
-	$MZ -6 $peer -c 1 -A $SIP -B $GRP -t ip hop=1,next=0,p="$p" -q
+	$MZ -6 $peer -a own -b $dmac -c 1 -A $SIP -B $GRP \
+		-t ip hop=1,next=0,p="$p" -q
 	sleep 1
 	! bridge mdb show dev br0 | grep -q $GRP
 }
-- 
2.40.1