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

[Steve Langasek]

The header of debian/patches/lp1845909/0001-network-rename-
linux_configure_after_setting_mtu-to-linux.patch in the eoan upload
appears to be a lie; I see substantive changes to the set_mtu_handler()
function in this patch, such as dropping an early return.

And the statement in the description of this bug that "that commit is
already included in Eoan so this sru is needed only for Disco" is at
odds with the 5 patches related to this bug that are in this debdiff.

Marking incomplete, pending clarifications.

** Changed in: systemd (Ubuntu Eoan)
       Status: In Progress => Incomplete

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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:
  Incomplete
Status in systemd source package in Focal:
  In Progress

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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