[ovs-dev] [PATCH ovn] ovn-northd: Fix IP multicast flooding to mrouter.

Dumitru Ceara dceara at redhat.com
Wed Oct 16 13:08:23 UTC 2019


On Wed, Oct 16, 2019 at 2:43 PM Numan Siddique <numans at ovn.org> wrote:
>
>
>
> On Wed, Oct 16, 2019 at 4:11 PM Dumitru Ceara <dceara at redhat.com> wrote:
>>
>> OVN logical flow "drop" actions can't be combined with other actions.
>> Commit 79308138891a created such a scenario if a logical switch has
>> mcast_snoop=true, mcast_flood_unregistered=false and is connected to a
>> logical router with mcast_relay=enabled.
>>
>> To fix the issue we now explicitly add a drop flow for unregistered IP
>> multicast traffic in a logical switch if mcast_snoop=true,
>> mcast_flood_unregistered=false and the switch doesn't have any ports
>> with mcast_flood=true and isn't connected to a router with
>> mcast_relay=true.
>>
>> Fixes: 79308138891a ("ovn-northd: Add static IP multicast flood configuration")
>> Signed-off-by: Dumitru Ceara <dceara at redhat.com>
>
>
> Hi Dumitru,
>
> Can you please update the ovn-northd documentation too about the flow changes ?
>
> Thanks
> Numan

Hi Numan,

Thanks for the review.
I sent a v2: https://patchwork.ozlabs.org/patch/1177904/

Thanks,
Dumitru

>
>>
>> ---
>>  northd/ovn-northd.c |  8 +++++++-
>>  tests/ovn.at        | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
>>  2 files changed, 54 insertions(+), 4 deletions(-)
>>
>> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
>> index e41c9d7..d0844dd 100644
>> --- a/northd/ovn-northd.c
>> +++ b/northd/ovn-northd.c
>> @@ -5661,7 +5661,13 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap *ports,
>>
>>                  if (mcast_sw_info->flood_static) {
>>                      ds_put_cstr(&actions, "outport =\""MC_STATIC"\"; output;");
>> -                } else {
>> +                }
>> +
>> +                /* Explicitly drop the traffic if relay or static flooding
>> +                 * is not configured.
>> +                 */
>> +                if (!mcast_sw_info->flood_relay &&
>> +                        !mcast_sw_info->flood_static) {
>>                      ds_put_cstr(&actions, "drop;");
>>                  }
>>
>> diff --git a/tests/ovn.at b/tests/ovn.at
>> index df00517..d141367 100644
>> --- a/tests/ovn.at
>> +++ b/tests/ovn.at
>> @@ -16306,7 +16306,7 @@ sleep 1
>>  OVN_CHECK_PACKETS([hv1/vif3-tx.pcap], [expected])
>>  OVN_CHECK_PACKETS([hv2/vif3-tx.pcap], [expected])
>>
>> -# Dissable IGMP querier on sw2.
>> +# Disable IGMP querier on sw2.
>>  ovn-nbctl set Logical_Switch sw2 \
>>      other_config:mcast_querier="false"
>>
>> @@ -16357,6 +16357,50 @@ send_igmp_v3_report hv2-vif3 hv2 \
>>      000000000001 $(ip_to_hex 10 0 0 1) f9f8 \
>>      $(ip_to_hex 239 0 1 68) 04 e9b9 \
>>      /dev/null
>> +
>> +# Check that the IGMP Group is learned by all switches.
>> +OVS_WAIT_UNTIL([
>> +    total_entries=`ovn-sbctl find IGMP_Group | grep "239.0.1.68" | wc -l`
>> +    test "${total_entries}" = "2"
>> +])
>> +
>> +# Send traffic from sw3 and make sure it is relayed by rtr.
>> +# to ports that joined.
>> +truncate -s 0 expected_routed_sw1
>> +truncate -s 0 expected_routed_sw2
>> +truncate -s 0 expected_empty
>> +
>> +as hv1 reset_pcap_file hv1-vif1 hv1/vif1
>> +as hv1 reset_pcap_file hv1-vif2 hv1/vif2
>> +as hv1 reset_pcap_file hv1-vif3 hv1/vif3
>> +as hv1 reset_pcap_file hv1-vif4 hv1/vif4
>> +as hv2 reset_pcap_file hv2-vif1 hv2/vif1
>> +as hv2 reset_pcap_file hv2-vif2 hv2/vif2
>> +as hv2 reset_pcap_file hv2-vif3 hv2/vif3
>> +as hv2 reset_pcap_file hv2-vif4 hv2/vif4
>> +
>> +send_ip_multicast_pkt hv2-vif4 hv2 \
>> +    000000000001 01005e000144 \
>> +    $(ip_to_hex 10 0 0 42) $(ip_to_hex 239 0 1 68) 1e 20 ca70 11 \
>> +    e518e518000a3b3a0000
>> +store_ip_multicast_pkt \
>> +    000000000100 01005e000144 \
>> +    $(ip_to_hex 10 0 0 42) $(ip_to_hex 239 0 1 68) 1e 1f cb70 11 \
>> +    e518e518000a3b3a0000 expected_routed_sw1
>> +store_ip_multicast_pkt \
>> +    000000000200 01005e000144 \
>> +    $(ip_to_hex 10 0 0 42) $(ip_to_hex 239 0 1 68) 1e 1f cb70 11 \
>> +    e518e518000a3b3a0000 expected_routed_sw2
>> +
>> +OVN_CHECK_PACKETS([hv1/vif1-tx.pcap], [expected_routed_sw1])
>> +OVN_CHECK_PACKETS([hv2/vif3-tx.pcap], [expected_routed_sw2])
>> +OVN_CHECK_PACKETS([hv1/vif4-tx.pcap], [expected_empty])
>> +OVN_CHECK_PACKETS([hv1/vif2-tx.pcap], [expected_empty])
>> +OVN_CHECK_PACKETS([hv1/vif3-tx.pcap], [expected_empty])
>> +OVN_CHECK_PACKETS([hv2/vif1-tx.pcap], [expected_empty])
>> +OVN_CHECK_PACKETS([hv2/vif2-tx.pcap], [expected_empty])
>> +OVN_CHECK_PACKETS([hv2/vif4-tx.pcap], [expected_empty])
>> +
>>  # Inject IGMP Join for 239.0.1.68 on sw3-p1.
>>  send_igmp_v3_report hv1-vif4 hv1 \
>>      000000000001 $(ip_to_hex 10 0 0 1) f9f8 \
>> @@ -16369,8 +16413,8 @@ OVS_WAIT_UNTIL([
>>      test "${total_entries}" = "3"
>>  ])
>>
>> -# Send traffic from sw3 and make sure it is relayed by rtr.
>> -# and ports that joined.
>> +# Send traffic from sw3 and make sure it is relayed by rtr
>> +# to ports that joined.
>>  truncate -s 0 expected_routed_sw1
>>  truncate -s 0 expected_routed_sw2
>>  truncate -s 0 expected_switched
>> --
>> 1.8.3.1
>>
>> _______________________________________________
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