TC program to redirect ingress traffic to a UDPRoute backend

[shaneutt]

Problem Statement

Previously we had a demo of using XDP to redirect packets to a Pod using UDPRoute. XDP however comes with a lot of additional baggage, and misses out on several helper functions that you can only get with skbuff in TC eBPF programs. The purpose of this task is to try and re-implement what we had before in TC.

Prerequisites

• create the BACKEND data-structure and BACKENDS map #8

Acceptance Criteria

• the demo we previously ran should now be runnable with a TC program instead

[shaneutt]

#23 handled a part of this, and #41 will handle the last bit, so closing this as outmoded.