http://[SDN site]/Not_Open_Network
Provided by SDN Site.
Tutorial for building onos app.
Block packets by setup firewall.
This should be qualify round challenge.
SCTF{The_B4sic_0f_SDN_4pp}
The given skeleton code (devenv) shows how to setup a PacketProcessor that intercepts packets and selectively forward the packets.
Then the problem boils down to writing a correct filtering condition that determines if a packet should be blocked or not.
The filtering logic is as simple as the problem description. (1) Block any packet contains "police" (2) block any packet that heads to 10.0.0.0/16 and ports other than 80.
You can use whatever method to implement above logic.
One way is to use Ip4Prefix.contains and
String.toLowerCase().contains.