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This bug was fixed in the package systemd - 229-4ubuntu19

---------------
systemd (229-4ubuntu19) xenial; urgency=medium

  * debian/extra/units/systemd-resolved.service.d/resolvconf.conf: partially
    revert, by removing ExecStart|StopPost lines, as these are not needed on
    xenial and generate warnings in the journal. (LP: #1704677)

systemd (229-4ubuntu18) xenial; urgency=medium

  * debian/extra/units/systemd-resolved.service.d/resolvconf.conf: if resolved
    is going to be started, make sure this blocks network-online.target.
    (LP: #1673860)
  * networkd: cherry-pick support for setting bridge port's priority
    (LP: #1668347)
  * Cherrypick upstream commit to enable system use kernel maximum limit for
    RLIMIT_NOFILE isntead of hard-coded (low) limit of 65536. (LP: #1686361)
  * Cherrypick upstream patch for platform predictable interface names.
    (LP: #1686784)
  * resolved: fix null pointer dereference crash (LP: #1621396)
  * Cherrypick core/timer downgrade message about random time addition
    (LP: #1692136)
  * SECURITY UPDATE: Out-of-bounds write in systemd-resolved (LP: #1695546)
    - CVE-2017-9445
  * Cherry-pick subset of patches to introduce infinity value in logind.conf
    for UserTasksMax (LP: #1651518)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 17 Jul 2017 17:00:42
+0100

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-9445

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https://bugs.launchpad.net/bugs/1668347

Title:
  Unable to set bridge_portpriority with networkd

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released
Status in systemd source package in Yakkety:
  In Progress
Status in systemd source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * Netplan uses systemd-netword provider to configure all sorts of networking settings
   * However, unlike ifupdown, released versions of systemd do not support setting bridgeport priority, aka
  `brctl setportprio <bridge> <port> <priority>`
   * This prevents full migration from ifupdown to netplan/systemd-networkd for projects like MAAS that do need to configure equal cost; yet differential priority bridge ports.
   * This is proposal to cherrypick this functionality which essentially accepts one more key in the .network units; and send those values via netlink.

  [Test Case]

   * networkd-test.py is executed as part of autopkgtests that
  configures a bridge, and sets various valid bridge port priorities and
  verifies from sysfs that those were correctly set by systemd.

   * Alternativey create a bridge .link unit, and specify .network unit
  for a bridge port and use Priority=4 setting in the [Bridge] section
  in the said unit to modify bridge port priority.

  
  [Regression Potential] 

   * This is an upstream cherrypick of functionality that will be
  included in 234 release. However, since MAAS and netplan target stable
  releases, I would like to cherrypick this functionality all the way
  back to xenial. This almost a feature, rather than a bugfix, but it is
  so small and accompanied by regression testsuite that it is almost a
  tiny bugfix.

  [Other Info]
   
   * Original request to support this feature.

  
  1. root@ubuntu:/run/systemd/network# lsb_release -rd
  Description:    Ubuntu Zesty Zapus (development branch)
  Release:        17.04

  2. root@ubuntu:/run/systemd/network# apt-cache policy systemd
  systemd:
    Installed: 232-18ubuntu1
    Candidate: 232-18ubuntu1
    Version table:
   *** 232-18ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
          100 /var/lib/dpkg/status

  3. Using a networkd config like this:

  # cat 10-netplan-eth1.network
  [Match]
  MACAddress=52:54:00:12:34:02
  Name=eth1

  [Network]
  Bridge=br0
  LinkLocalAddressing=no
  IPv6AcceptRA=no

  [Bridge]
  Cost=50
  Priority=28

  %  cat /sys/class/net/br0/brif/eth1/priority
  28

  4. %  cat /sys/class/net/br0/brif/eth1/priority
  32

  When using ifupdown and /etc/network/interfaces to configure a bridge
  users are able to specify a bridge port priority:

  auto br0
  iface br0 inet static
    address 192.168.1.1
    bridge_ports eth1 eth2
    bridge_portprio eth1 28
    bridge_portprio eth2 14

  Which results in the bridge hook scripts running:

  brctl setportprio br0 eth1 28

  which is visible via:

  /sys/class/net/br0/brif/eth2/priority

  Note, networkd does not mention PortPriority under netdev Bridge section,
  however, PathCost is mentioned.  It appears networkd is missing an implementation.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: systemd 232-18ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-8.10-generic 4.10.0-rc8
  Uname: Linux 4.10.0-8-generic x86_64
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  Date: Mon Feb 27 17:11:32 2017
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-8-generic root=UUID=900c1e3f-f682-4455-949c-ebdbf60ac6f5 ro console=ttyS0
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.1-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-zesty
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.1-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-zesty:cvnQEMU:ct1:cvrpc-i440fx-zesty:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-zesty
  dmi.sys.vendor: QEMU

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