[Bug 1937110] Re: dhcp option 121 & 249

[Steve Langasek]

The change is trivial and I'm going to upload it to the jammy SRU queue,
but we need a test case in order for this SRU to be accepted.  If
someone affected by this bug can please detail how to reproduce the
issue *without* having to first generate a new installer image, that
would be useful.

It's possible to test the network in the regular initramfs by booting
with 'ip=dhcp break=bottom' - but need a dhcp server config to go with
it that will reproduce the problem.

** Changed in: isc-dhcp (Ubuntu Jammy)
       Status: Confirmed => Incomplete

** Changed in: isc-dhcp (Ubuntu)
     Assignee: (unassigned) => Steve Langasek (vorlon)

** Changed in: isc-dhcp (Ubuntu Jammy)
     Assignee: (unassigned) => Steve Langasek (vorlon)

** Changed in: isc-dhcp (Ubuntu)
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1937110

Title:
  dhcp option 121 & 249

Status in subiquity:
  New
Status in isc-dhcp package in Ubuntu:
  Fix Committed
Status in isc-dhcp source package in Jammy:
  Incomplete

Bug description:
  Hello,

  I'm running into issues with subiquity on a cloud provider.  The cloud
  provider is using an on-link L3 gateway.

  
  His DHCP response looks like this:

  
  OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
  OPTION:  54 (  4) Server identifier         172.31.1.1
  OPTION:  51 (  4) IP address leasetime      86400 (24h)
  OPTION:   1 (  4) Subnet mask               255.255.255.255
  OPTION:   3 (  4) Routers                   172.31.1.1
  OPTION:   6 ( 12) DNS server                ....
  OPTION: 121 ( 14) Classless Static Route    20ac1f0101000000  .......
  					    0000ac1f0101     ......
  OPTION: 249 ( 14) MSFT - Classless route    20ac1f0101000000  .......
  					    0000ac1f0101     ......

  
  Im booting the subiquity process with an patched ipxe (https://github.com/ipxe/ipxe/pull/104) like this:

  #!ipxe
  kernel .../vmlinuz initrd=initrd root=/dev/ram0 ramdisk_size=1500000 ip=dhcp url=https://cdimage.ubuntu.com/ubuntu-server/focal/daily-live/current/focal-live-server-amd64.iso autoinstall ds=nocloud-net;s=.../...-ad-78/ cloud-config-url=/dev/null
  initrd .../initrd
  boot

  initrd/vmlinuz is extracted right out of focal-live-server-amd64.iso

  Sadly subiquity is stuck with a broken network (because of missing
  dhcp option 121/249 support). It happens when its running the /init
  from the kernel right after kernel is booted, i guess even before the
  subiquity is started(?).

  After further debugging, it looks like the provided kernel 5.4.80 #90
  Ubuntu, is using busybox 1.30.1-4ubuntu~6.3 which includes isc-
  dhclient-4.4.1 which is lacking the given options.

  
  Would be awesome if this could be fixed.. maybe just a simple busybox compile option?

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