[Bug 1914988] Re: IGMP Snooping does not work with RBAC enabled ovn-controllers

[Brian Murray]

Hello Pedro, or anyone else affected,

Accepted ovn into hirsute-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/ovn/20.12.0-0ubuntu3
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
hirsute to verification-done-hirsute. If it does not fix the bug for
you, please add a comment stating that, and change the tag to
verification-failed-hirsute. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: ovn (Ubuntu Hirsute)
       Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-hirsute

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https://bugs.launchpad.net/bugs/1914988

Title:
  IGMP Snooping does not work with RBAC enabled ovn-controllers

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive wallaby series:
  New
Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Confirmed
Status in ovn source package in Hirsute:
  Fix Committed
Status in ovn source package in Impish:
  Fix Released

Bug description:
  [Impact]
  It is currently not possible to use Multicast IGMP snooping with OVN in Ubuntu Focal and Hirsute.

  [Test Plan]
  1. Execute the gate tests for the neutron-api-plugin-ovn charm, which performs a full cloud deployment and confirms two instances can spawn, get metadata and communicate with each other.

  2. Enable IGMP snooping and have instances join a multicast group and
  validate that packets forward and check for RBAC errors.

  [Regression Potential]
  This is a very small patch that adds a static RBAC rule that ovn-northd writes into the database.  The patch has already been available in the upstream branches since February 2021, we have also landed several similar patches upstream which have previously been made available to Focal through point release updates.

  [Original Bug Description]
  Hi,

  I've tested this on both 20.03 and 20.06.

  Looking into ovn-architecture.xml: https://github.com/ovn-org/ovn/blob/master/ovn-architecture.7.xml#L2530
  It states that once RBAC is enabled, ovn-controllers will have access to some of the tables and that is hardcoded within OVN.

  That means once RBAC is enabled, IGMP_Group table is out of reach for
  ovn-controllers and will cause the following issue:

  2021-02-06T17:17:40.916Z|00028|ovsdb_idl|WARN|transaction error:
  {"details":"RBAC rules for client "REDACTED" role "ovn-controller"
  prohibit row insertion into table "IGMP_Group".","error":"permission
  error"}

  Reported on upstream repo: https://github.com/ovn-org/ovn/issues/77

  Proposed patch:
  https://github.com/phvalguima/ovn/commit/3419d9946c51b413f816ceb82372677e4afdbe9d

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