[Bug 1925827] Re: [v247] backport routing policy rule fix

[Zhang Youfu]

Tested systemd 247.3-3ubuntu3.2 on hirsute, without problem.

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Title:
  [v247] backport routing policy rule fix

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Hirsute:
  Fix Committed

Bug description:
  [impact]

  routing policy rules not correctly configured

  [test case]

  more detail in upstream bug linked from original description.

  configure interface with:

  [Match]
  Name = ens3

  [Network]
  Address = 10.0.0.1/32

  [RoutingPolicyRule]
  Family = both
  IncomingInterface = ens3
  Table = 42
  Priority = 42

  
  then networkctl reload. then update the network file with:

  [Route]
  Table = 42
  Destination = 10.0.0.0/24
  Gateway = 0.0.0.0

  and run networkctl reload again, checking systemd-networkd for error.

  [regression potential]

  failure to properly configure networking in general, or policy routes.

  [scope]

  this is needed only for h.

  this is fixed already in i, and this is not reproducable in g.

  see original descrption for link to specific upstream issue and pr.

  [original description]

  The original issue can be found at https://github.com/systemd/systemd/issues/18107.
  I filed a backport PR (https://github.com/systemd/systemd-stable/pull/96) against v247-stable branch, which got merged and released in v247.4.
  However due to the freezing state of Debian bullseye, upstream systemd package is frozen at v247.3.
  Please apply this patchset for Ubuntu if possible.
  Thanks.

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