Accessing current netns info in a TC eBPF program

I am trying to attach the same TC eBPF program instance to both host
and container interfaces. So some of the maps need to be qualified
with the netns id. I was wondering if there is a way to access the
'current' netns info in a TC eBPF program.

No file, test, or entry point is named. Start by reviewing the TC eBPF program context and available network-namespace information, then determine whether the same program can distinguish host and container interfaces for netns-qualified maps; completion would require a documented or implemented approach validated in both environments.

Written by the indexing model from the issue text.