kernel/canethgw accepts configuration over netlink
The module accepts routing commands from cegw using netlink.
It builds RCU hlist of routing rules and performs routing on
received packets on both CAN and UDP.
The cangw program was modified (renamed to cangwcfg) to
send rtnetlink information to canethgw. Canethgw registers
netlink callback and prints received port and udp settings.