Example programs for the Journeying into XDP blogs
After cloning the repository:
git submodule update --init
cd libbpf/src
(possibly apt install libelf-dev and gcc-multilib)
make
cd ../../Cookies
make
(Substitute "Cookies" for another program if desirable)
Then use (and change where nesecary) the different make commands to interact with the bpf programs.