[Bug 1945888] [NEW] DHCPv6 too strict when the response is missing IAID for some sections

[Ole Markus With]

Public bug reported:

Systemd incorrectly ignores whole messages when IAID is missing for some sections.
This has been reported upstream [1] and fixed [2].

$ lsb_release -rd
Description:    Ubuntu 21.04
Release:        21.04

 $ apt-cache policy systemd
systemd:
  Installed: 247.3-3ubuntu3.6
  Candidate: 247.3-3ubuntu3.6
  Version table:
 *** 247.3-3ubuntu3.6 500
        500 http://no.archive.ubuntu.com/ubuntu hirsute-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     247.3-3ubuntu3.4 500
        500 http://security.ubuntu.com/ubuntu hirsute-security/main amd64 Packages
     247.3-3ubuntu3 500
        500 http://no.archive.ubuntu.com/ubuntu hirsute/main amd64 Packages


What is expected to happen is that systemd will ignore only the relevant part of the message, not the entire message. 

What is happening is that the entire message is ignored, leading to DHCP
leases not being renewed. This is fairly easy to replicate e.g in AWS by
enabling both an IPv6 prefix and an IPv6 single address to the same
interface.

[1] https://github.com/systemd/systemd/issues/20803
[2] https://github.com/systemd/systemd/pull/20807

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1945888

Title:
  DHCPv6 too strict when the response is missing IAID for some sections

Status in systemd package in Ubuntu:
  New

Bug description:
  Systemd incorrectly ignores whole messages when IAID is missing for some sections.
  This has been reported upstream [1] and fixed [2].

  $ lsb_release -rd
  Description:    Ubuntu 21.04
  Release:        21.04

   $ apt-cache policy systemd
  systemd:
    Installed: 247.3-3ubuntu3.6
    Candidate: 247.3-3ubuntu3.6
    Version table:
   *** 247.3-3ubuntu3.6 500
          500 http://no.archive.ubuntu.com/ubuntu hirsute-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       247.3-3ubuntu3.4 500
          500 http://security.ubuntu.com/ubuntu hirsute-security/main amd64 Packages
       247.3-3ubuntu3 500
          500 http://no.archive.ubuntu.com/ubuntu hirsute/main amd64 Packages

  
  What is expected to happen is that systemd will ignore only the relevant part of the message, not the entire message. 

  What is happening is that the entire message is ignored, leading to
  DHCP leases not being renewed. This is fairly easy to replicate e.g in
  AWS by enabling both an IPv6 prefix and an IPv6 single address to the
  same interface.

  [1] https://github.com/systemd/systemd/issues/20803
  [2] https://github.com/systemd/systemd/pull/20807

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