XFRM interfaces are available in Linux Kernel 4.19+
When an IF_ID is applied to a XFRM policy and state, the corresponding
traffic will be sent through the virtual interface with the same IF_ID.
* Add Mark to xrfm state
Signed-off-by: Alessandro Boch <aboch@docker.com>
* Add Mark to xfrm policies
Signed-off-by: Alessandro Boch <aboch@docker.com>