Bug#1138756: systemd: DHCPv4 UserClass sends incorrect value

[Anthony Bourguignon]

Package: systemd
Version: 257.13-1~deb13u1
Severity: important
Tags: upstream
X-Debbugs-Cc: debian+bts at toniob.net

Dear Maintainer,

The systemd-network packaged in Trixie has an issue with the DHCPv4
UserClass option. When you use it, it doesn’t take into account what you
put as a value, and it always sends 01 90 in the packet. The DHCPv4
packet is therefore incorrect.

It is a regression and it seems there is an upstream issue resolved
about it :
https://github.com/systemd/systemd/issues/41774 .

Could you please backport this commit in trixie to make the option
usable again and recover the feature ?

Thank you


-- Package-specific info:

-- System Information:
Debian Release: 13.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.90+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages systemd depends on:
ii  libacl1            2.3.2-2+b1
ii  libapparmor1       4.1.0-1
ii  libc6              2.41-12+deb13u3
ii  libmount1          2.41-5
ii  libpam0g           1.7.0-5
ii  libseccomp2        2.6.0-2
ii  libselinux1        3.8.1-1
ii  libssl3t64         3.5.6-1~deb13u1
ii  libsystemd-shared  257.13-1~deb13u1
ii  libsystemd0        257.13-1~deb13u1
ii  mount              2.41-5

Versions of packages systemd recommends:
ii  chrony [time-daemon]            4.6.1-3+deb13u1
ii  dbus [default-dbus-system-bus]  1.16.2-2
ii  linux-sysctl-defaults           4.12.1
ii  systemd-cryptsetup              257.13-1~deb13u1

Versions of packages systemd suggests:
ii  libtss2-tcti-device0t64 [libtss2-tcti-device0]  4.1.3-1.2
ii  polkitd                                         126-2
pn  systemd-boot                                    <none>
ii  systemd-container                               257.13-1~deb13u1
pn  systemd-homed                                   <none>
pn  systemd-repart                                  <none>
pn  systemd-resolved                                <none>
pn  systemd-userdbd                                 <none>

Versions of packages systemd is related to:
ii  dbus-user-session  1.16.2-2
pn  dracut             <none>
ii  initramfs-tools    0.148.4
pn  libnss-systemd     <none>
ii  libpam-systemd     257.13-1~deb13u1
ii  udev               257.13-1~deb13u1

-- Configuration Files:
/etc/systemd/networkd.conf changed [not included]

-- no debconf information