[systemd-bugs] [Bug 90029] New: networkd: Please add support for an [addrlabel] section

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90029

            Bug ID: 90029
           Summary: networkd: Please add support for an [addrlabel]
                    section
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: cb at lathspell.de
        QA Contact: systemd-bugs at lists.freedesktop.org

I'm looking for a way to configure the following command line via systemd's
networkd:

  ip addrlabel add prefix 2001:1111:0:222:33::/128 label 666
  ip addrlabel add prefix 2001:1111::/32           label 666

My suggestion would be the following addtion to
/etc/systemd/network/foo.network

  ...
  [address]
  address = 2001:1111:0:111:44::/128

  [address]
  address = 2001:1111:0:222:33::/128

  [addrlabel]
  prefix = 2001:1111:0:222:33::/128
  label = 666

  [addrlabel]
  prefix = 2001:1111::/32
  prefix = 666

Background:
When searching for a source IP, the Kernel prefers those that have the same 
label as the destination network. Packets to 2001:1111::/32, which is labeled
with 666, would thus originate from 2001:1111:0:222:33::/128, which also has
the label 666. All other IPv6 targets would have the default address label "0"
and thus be originate with the address 2001:1111:0:111:44::/128 which also has
the default label "0". This is useful to have a static IP for company internal
targets and a temporary random address (-> IPv6 privacy extension) for
everything else.

Current workaround:
Using a service unit that waits for the interface to come up and then executes
/sbin/ip as suggested in
http://lists.freedesktop.org/archives/systemd-devel/2015-April/030725.html

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