I'm a bit confused. OpenWRT ships the kmod-ovpn-dco package implying it should support DCO but only ships OpenVPN 2.5 which according to OpenVPN docs does not support DCO. Has OpenWRT backported DCO support to 2.5 or is the kmod package useless for right now?
EDIT: I just ran strings on the binary and it doesn't make any mention of DCO unlike the binary on my PC so I believe the kmod is currently completely unused, if this is wrong please lmk.