[Bug 2092061] Re: openvpn-dco-dkms FTBS in Noble with linux-6.11-hwe kernel

[Ubuntu Foundations Team Bug Bot]

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** Tags added: patch

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https://bugs.launchpad.net/bugs/2092061

Title:
  openvpn-dco-dkms FTBS in Noble with linux-6.11-hwe kernel

Status in openvpn-dco-dkms package in Ubuntu:
  In Progress
Status in openvpn-dco-dkms source package in Noble:
  In Progress

Bug description:
  [ Impact ]

  openvpn-dco-dkms does not compile from source in Noble with kernel
  6.11:

  In file included from /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/crypto.h:16,
                   from /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/addr.h:13,
                   from /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/peer.h:13,
                   from /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/ovpn.h:14,
                   from /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/main.c:12:
  /var/lib/dkms/ovpn-dco/0.0+git20231103/build/include/uapi/linux/ovpn_dco.h:14:22: error: expected declaration specifiers or ‘...’ before string constant
     14 | #define OVPN_NL_NAME "ovpn-dco-v2"
        |                      ^~~~~~~~~~~~~
  /var/lib/dkms/ovpn-dco/0.0+git20231103/build/drivers/net/ovpn-dco/main.c:263:26: note: in expansion of macro ‘OVPN_NL_NAME’
    263 | MODULE_ALIAS_GENL_FAMILY(OVPN_NL_NAME);
        |                          ^~~~~~~~~~~~

  [ Test case ]

  Install the latest linux-6.11 kernel on Noble:

  $ sudo add-apt-repository ppa:canonical-kernel-team/ppa
  $ sudo apt update
  $ sudo apt install linux-image-6.11.0-12-generic \
                     linux-modules-6.11.0-12-generic \
                     linux-modules-extra-6.11.0-12-generic \
                     linux-headers-6.11.0-12-generic

  Install openvpn-dco-dkms:

  $ sudo apt install openvpn-dco-dkms

  Load the module:

  $ sudo modprobe ovpn-dco-v2

  The same procedure should be repeated on linux-6.8 to test for
  possible regressions.

  [ Fix ]

  Patch the code to properly support the new linux 6.11 ABI.

  [ Regression potential ]

  A regression is unlikely due to the very limited scope of the patch

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