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Bug 1935155

Summary:	IGMP/MLD packets being dropped
Product:	OpenShift Container Platform	Reporter:	Victor Pickard <vpickard>
Component:	Networking	Assignee:	Dumitru Ceara <dceara>
Networking sub component:	ovn-kubernetes	QA Contact:	Weibin Liang <weliang>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	high
Priority:	high	CC:	aconstan, trozet, weliang, zzhao
Version:	4.7	Flags:	weliang: needinfo-
Target Milestone:	---
Target Release:	4.8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:
Clones:	1935180 (view as bug list)		Environment:
Last Closed:	2021-07-27 22:51:10 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1935180

Description Victor Pickard 2021-03-04 13:11:26 UTC

Description of problem:

Ovn-k8s multicast allow acls should allow IGMP/MLD pkts regardless of source address.

IPv6 MLD packets are being dropped.



Version-Release number of selected component (if applicable):


How reproducible:

Always


Steps to Reproduce

There is a detailed slack conversation regarding this issue here:

https://coreos.slack.com/archives/C01G7T6SYSD/p1614799149160300

I have an ipv4 single stack cluster with ovn-kubernetes cni.
I see that after few minutes ~5, the join (igmp) request is expired.
I'm following the steps in the openshift "enable multicast" guide.

If I run

oc exec mlistener -i -t -- \
    socat UDP4-RECVFROM:30102,ip-add-membership=224.1.0.1:$POD_IP,fork EXEC:hostname

then I run

oc exec msender -i -t -- \
    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"


It works as expected.

But if I run the send request again after ~5 min, it doesn't work. I need the "listener" to re-join the multicast group to make it work again.

Actual results:


Expected results:


Additional info:

Comment 2 Weibin Liang 2021-03-17 17:10:34 UTC

https://github.com/ovn-org/ovn-kubernetes/pull/2088 is merged in ovn-org:master, but not in openshift:release-4.7

Testing still failed in 4.7.0-0.nightly-2021-03-17-090327

Comment 3 Victor Pickard 2021-03-17 17:16:25 UTC

@weliang This BZ should be verified in 4.8 nightly, right?

There is another BZ, https://bugzilla.redhat.com/show_bug.cgi?id=1935180, for the backport to 4.7.z.

Comment 4 Weibin Liang 2021-03-17 18:26:55 UTC

@vpickard Thanks for infor

Testing passed in 4.8.0-0.nightly-2021-03-17-123640.

Comment 8 errata-xmlrpc 2021-07-27 22:51:10 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.8.2 bug fix and security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:2438