> How easy is it to spoof the source IP and port in UDP packets?

Dead simple. Two lines of C.

> packets.  Now my question is, do I need a similar "challenge number" system
> for my new code

Yes.

> or is it enough to check NET_CompareBaseAdr() or NET_CompareAdr()?

No.

Google 'tcp sequence number' and implement something similar. Make
sure your sequences are non-guessable. Possibly look at the sequence
generator in your kernel for inspiration.
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