kern/58169: tap(4) still uses IFF_OACTIVE and should stop

[campbell+netbsd%mumble.net@localhost]

>Number:         58169
>Category:       kern
>Synopsis:       tap(4) still uses IFF_OACTIVE and should stop
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 17 21:25:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, 8, ...
>Organization:
The TapIFF Oactivation
>Environment:
>Description:
tap(4) uses IFF_OACTIVE in struct ifnet::if_flags.
>How-To-Repeat:
code inspection for MP-safety
>Fix:
If tap(4) needs this state, it should be moved to tap_softc with access serialized by a tap-specific lock.