[Bug 1818282] Re: systemd-networkd - RoutingPolicyRule does not apply correctly

[Eric Desrochers]

Sponsored for Disco, considering that after a discussion with joalif,
she committed to file a debian bug and submit the patchset to debian as
well for stay consistent in the chain Upstream -> Debian -> Ubuntu.

- Eric

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https://bugs.launchpad.net/bugs/1818282

Title:
  systemd-networkd - RoutingPolicyRule does not apply correctly

Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Cosmic:
  In Progress
Status in systemd source package in Disco:
  In Progress

Bug description:
  [Impact]

  When attaching multiple IPs on secondary interface the routing policy rules do not
  apply for all IPs.
  The rules that are applied after restarting networkd are random.

  The issue has been reported and addressed upstream.

  [Test Case]

  Attach multiple IPs to secondary interface, config file:

  $ cat /etc/systemd/network/ens8.network
  [Match]
  Name=ens8

  [Network]
  Address=172.31.28.195/20
  Address=172.31.24.151/20
  Address=172.31.24.152/20
  Address=172.31.24.153/20

  [Route]
  Destination=0.0.0.0/0
  Gateway=172.31.16.1
  Table=1000

  [Route]
  Destination=172.31.24.153
  Gateway=0.0.0.0
  Scope=link
  Table=1000

  [Route]
  Destination=172.31.28.195
  Gateway=0.0.0.0
  Scope=link
  Table=1000

  [Route]
  Destination=172.31.24.151
  Gateway=0.0.0.0
  Scope=link
  Table=1000

  [Route]
  Destination=172.31.24.152
  Gateway=0.0.0.0
  Scope=link
  Table=1000

  [RoutingPolicyRule]
  From=172.31.24.153
  Table=1000

  [RoutingPolicyRule]
  From=172.31.28.195
  Table=1000

  [RoutingPolicyRule]
  From=172.31.24.152
  Table=1000

  [RoutingPolicyRule]
  From=172.31.24.151
  Table=1000

  $ ip rule show
  0:	from all lookup local
  0:	from 172.31.24.151 lookup 1000
  32766:	from all lookup main
  32767:	from all lookup default

  - restart networkd

  $ sudo systemctl restart systemd-networkd

  $ ip rule show
  0:	from all lookup local
  0:	from 172.31.24.151 lookup 1000
  0:	from 172.31.24.153 lookup 1000
  0:	from 172.31.28.195 lookup 1000
  32766:	from all lookup main
  32767:	from all lookup default

  - restart again

  $ sudo systemctl restart systemd-networkd

  $ ip rule show
  0:	from all lookup local
  0:	from 172.31.24.151 lookup 1000
  0:	from 172.31.24.152 lookup 1000
  32766:	from all lookup main
  32767:	from all lookup default

  The behaviour is random

  [Regression Potential]

  May impact the systemd-networkd service functionality.

  [Other]

  Affects Disco Bionic and Cosmic.

  Upstream bug : https://github.com/systemd/systemd/issues/11280
  Upstream fix : https://github.com/systemd/systemd/pull/11795/commits

  $ lsb_release -rd
  Description:	Ubuntu Disco Dingo (development branch)
  Release:	19.04

  Systemd version :
  systemd:
    Installed: 240-6ubuntu1
    Candidate: 240-6ubuntu1
    Version table:
   *** 240-6ubuntu1 500
          500 http://gb.archive.ubuntu.com/ubuntu disco/main amd64 Packages
          100 /var/lib/dpkg/status

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