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

[Zhang Youfu]

filed an upstream issue

** Bug watch added: github.com/systemd/systemd/issues #13882
   https://github.com/systemd/systemd/issues/13882

** Changed in: systemd
       Status: Fix Released => Unknown

** Changed in: systemd
 Remote watch: github.com/systemd/systemd/issues #12886 => github.com/systemd/systemd/issues #13882

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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:
  Fix Released
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Disco:
  In Progress
Status in systemd source package in Eoan:
  Fix Released

Bug description:
  [impact]

  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.

  [regression potential]

  this moves the point when ipv6ll is configured; regressions would most
  likely involve failure to correctly configure an ipv6ll address when
  desired.

  [other info]

  this bug was attempted to be fixed by 'debian/patches/networkd-honour-LinkLocalAddressing.patch' from upstream issue 9890, using a commit that does not correctly fix the issue and was never accepted upstream:
  https://github.com/systemd/systemd/issues/9890#issuecomment-455168751

  this SRU completely reverts that patch, and adds the correct fix which
  was merged upstream:
  https://github.com/systemd/systemd/commit/0e2fdb83bb5e22047e0c7cc058b415d0e93f02cf

  that commit is already included in Eoan so this sru is needed only for
  Disco.

  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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