GitLab

~ Also the ID string of MASQUERADE has been changed to POSTROUTING_MASQUERADE and it uses the same format for device and subnet (INPUTDEV_SUBNET_OUTPUTDEV) as the FORWARD_SUBNET_PROTECTIVE call. This way it's possible to grep both and delete FORWARD_SUBNET_PROTECTIVE rules for a specific subnet config along with it's POSTROUTING_MASQUERADE rule entries in one step.
~ REMOVE_RULES call implemented. It deletes all rules matching the given ID string. Any possible orphaned chain is deallocated (removed) too. This keeps the rules table clean.

~ getLinkID() implemented which extends getLinkMAC() function. In case of virtual network interfaces no appropriate ID was returned. getLinkID() returns a hash of the interface name instead of an empty MAC identifer when no MAC address is available. Further the MAC address is now obtained from the /sys/class/net/* path instead of calling ip command plus expensive grep'ing.
~ getLinkMac() was revised to just return a the MAC address. Additionally it provides a return code for successful retrieval of a MAC address.
~ The ALLOW_DHCPV6_CLIENT call was revised to handle IPv4 protocol too and has been renamed to ALLOW_DHCP_CLIENT accordingly.