wifi: cfg80211: add support for NAN data interface

This new interface type represents a NAN data interface (NDI).
It is used for data communication with NAN peers.

Note that the existing NL80211_IFTYPE_NAN interface, which is the NAN
Management Interface (NMI), is used for management communication.

An NDI interface is started when a new NAN data path is about to
be established, and is stopped after the NAN data path is terminated.

- An NDI interface can only be started if the NMI is running, and NAN is
  started.
- Before the NMI is stopped, the NDI interfaces will be stopped.

Add the new interface type, handle add/remove operations for it,
and makes sure of the conditions above.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260219114327.0d681335c2e2.I92973483e927820ae2297853c141842fdb262747@changeid
Link: https://patch.msgid.link/20260318123926.206536-4-miriam.rachel.korenblit@intel.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 539dcf65c188..1797ece50295 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3981,6 +3981,27 @@ struct cfg80211_qos_map {
 };
 
 /**
+ * DOC: Neighbor Awareness Networking (NAN)
+ *
+ * NAN uses two interface types:
+ *
+ * - %NL80211_IFTYPE_NAN: a non-netdev interface. This has two roles: (1) holds
+ *   the configuration of all NAN activities (DE parameters, synchronisation
+ *   parameters, local schedule, etc.), and (2) uses as the NAN Management
+ *   Interface (NMI), which is used for NAN management communication.
+ *
+ * - %NL80211_IFTYPE_NAN_DATA: The NAN Data Interface (NDI), used for data
+ *   communication with NAN peers.
+ *
+ * An NDI interface can only be started (IFF_UP) if the NMI one is running and
+ * NAN is started. Before NAN is stopped, all associated NDI interfaces
+ * must be stopped first.
+ *
+ * The local schedule specifies which channels the device is available on and
+ * when. Must be cancelled before NAN is stopped.
+ */
+
+/**
  * struct cfg80211_nan_band_config - NAN band specific configuration
  *
  * @chan: Pointer to the IEEE 802.11 channel structure. The channel to be used