Felix Fietkau ae3fabae25 hostapd: ubus notifies a change of the BSS Color fields
A subscriber that reports the BSS Color and the OBSS colours of a radio
must know when they change without a configuration change. The kernel announces a colour change that the
driver starts, aborts or completes, but hostapd takes the new colour,
or leaves BSS Color disabled, only when it handles that event. Some
changes have no event at all:
- with no free colour left, the collision timeout disables BSS Color
  and picks a new colour itself;
- a collision timeout whose colour change the driver does not start
  leaves BSS Color disabled;
- the OBSS colours of the radio change.

606-ap-notify-ubus-of-a-bss-color-change calls the new
hostapd_ubus_notify_bss_color():
- in the no free colour branch of the collision timeout;
- after the colour change loop of the collision timeout. This call
  fires in every case, whether the driver started the change or not;
- at the end of hostapd_event_color_change(), after hostapd took the
  new colour at a completion, or left BSS Color disabled at an abort;
- when the aged set of OBSS colours of the radio changes, as a colour
  is added or leaves it (174), and not at each repeated collision
  event.

It sends the bss-color-change notification, { ifname, bssid, link_id }
(link_id for an affiliated AP of an AP MLD), on the object of the BSS.
get_status carries the new values.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2026-10-08 09:50:39 +02:00
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