[Bug 1845909] Re: [SRU] IPv6 link local address is assigned even when LinkLocalAddressing=no|ipv4

[Dan Streetman]

re-uploaded with the added error handling mentioned by @vorlon in
comment 11 removed; error handling behavior is unchanged now, and while
it's not really the correct error handling behavior, that is a separate
issue to this bug.

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Title:
  [SRU] IPv6 link local address is assigned even when
  LinkLocalAddressing=no|ipv4

Status in systemd:
  New
Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Disco:
  Won't Fix
Status in systemd source package in Eoan:
  In Progress
Status in systemd source package in Focal:
  In Progress

Bug description:
  [impact]

  in some situations when a networkd interface is configured with
  LinkLocalAddressing=no, networkd still assigns a link-local address to
  it

  [test case]

  see comment 3.

  note I was only able to reproduce this at boot time; if the vlan
  interface is removed (i.e. 'sudo ip l del pppoe') and then networkd
  restarted, the pppoe interface is created and does not have a link-
  local address.  This is due to this bug being triggered by timing, as
  a vlan interface is raised by the kernel when its parent interface is
  raised, in this case by networkd itself.

  [regression potential]

  this changes how ipv6ll addresses are managed and dropped, as well as
  changing when foreign addresses are dropped (later in config process).
  Any regressions would likely be around incorrectly setting ipv6ll
  addresses, or complete failure to complete interface configuration.

  [scope]

  this is fixed upstream by:
  https://github.com/systemd/systemd/pull/13927

  and also requires the upstream PR referenced in the original description:
  upstream patch: https://github.com/systemd/systemd/pull/13565

  this is required for focal (uploaded already), eoan, and bionic.  It
  may be required for xenial.

  [other info]

  Note, the original description below is incorrect, the issue/patch it
  references is not enough to fix this issue.

  original description:

  --

  upstream issue: https://github.com/systemd/systemd/issues/12886
  upstream patch: https://github.com/systemd/systemd/pull/13565

  The upstream fix will be available in systemd 244.
  Backport please. Thanks.

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