net80211: post RTM_IFINFO notification after toggling IFF_DRV_RUNNING

[avg]

Summary

This is useful when a wireless driver is stopped or started in response
to events like an RF Kill button press.
Applications like wpa_supplicant depend on such events to have
a correct view of interface state.

[cy]

LGTM.

Works on iwn.

Maybe I'm wrong but I seem to have a foggy recollection that this used to work.

[adrian]

It likely worked via polling the interface state or something.

I've noticed a bunch of other un-fun issues where dhclient stops noticing the interface state change so it starts re-doing DHCP.. should look into that too to see what's up.

sys/net80211/ieee80211_proto.c

1633 ↗

(On Diff #72019)

So to try and keep this portable, I suggest making the call to rt_ifmsg() a method that you add to ieee80211_freebsd.c . That way the other downstream consumers of net80211 (dragonflybsd and haiku to name two) can decide how they want to handle it.

That also potentially keeps the CURVNET_SET/RESTORE calls in _freebsd.c, hiding it from OSes that don't use it.

[avg]

do not call rt_ifmsg directly, wrap it under ieee80211_notify_ifnet_change

[avg]

@adrian, is this closer to what you have in mind?
Thanks!

[adrian]

yup!