All of these were last updated from the iproute2 source around 2016-04-13. The software version at that time was version iproute2-4.5.0.
The iproute2 suite is the Linux-specific command-line toolkit for interacting with the kernel data structures which run the networking stack. The toolkit allows address and route enumeration, statistics gathering, traffic control management and, of course, configuration.
Another introductory text by somebody trying to dive into the Linux traffic control subsystem, specifically, focusing on the tc filter command.