kern/58500: experimental wg(4) needs dtrace probes

[campbell+netbsd%mumble.net@localhost]

>Number:         58500
>Category:       kern
>Synopsis:       experimental wg(4) needs dtrace probes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 28 15:10:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10
>Organization:
The sdt:wg:netbsd:foundation
>Environment:
>Description:
The ad-hoc logging mechanism has been useful for debugging but it would be better to have systematic dtrace probes.

Probes should be available on all:

1. input handshake messages and processing results
2. output handshake messages and retries
3. state transitions
4. rekey decisions
5. data rx and processing results (decryption failure, replay detect, ...)
6. data tx and keepalives
7. task scheduling
8. task execution
9. wg_overudp_cb callbacks
10. socket upcalls and job
11. peer creation and destruction
12. anything else I haven't thought of
>How-To-Repeat:
try to diagnose wg(4) issues
>Fix:
Yes, please!