selftests: forwarding: bridge_mdb_max: 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: 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>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://lore.kernel.org/r/20230808141503.4060661-17-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh b/tools/testing/selftests/net/forwarding/bridge_mdb_max.sh
index fa762b71628893bf722e70c6e78f00fa47fac8d7..3da9d93ab36fb9b6cea1160a9889ee4869f84623 100755 (executable)
--- 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
 }