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

[Corey Bryant]

Verified successfully on focal-proposed. Bionic-proposed is hitting
charm issues that I'm trying to figure out.

** Attachment removed: "1914988-testing.txt"
   https://bugs.launchpad.net/cloud-archive/+bug/1914988/+attachment/5536331/+files/1914988-testing.txt

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

Status in charm-ovn-central:
  Invalid
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in Ubuntu Cloud Archive wallaby series:
  Fix Committed
Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Fix Committed
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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