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Commit d591a1f3aad92ade4642e4173f4c368006c27f0f in the Linux kernel removed handling of the TUN_F_UFO flag in the set_offload() function for tun devices (in net/tun.c).
Because of this, when TUN_F_UFO (0x10) is set in the argument for an ioctl(..., TUNSETOFFLOAD, ...) call on a tun device, an error will be indicated, with errno set to EINVAL.
The output of packdrill in this case looks like this:
This change removes the TUN_F_UFO flag from the argument in order to avoid this problem.