nl80211: add support for BSS coloring

This patch adds support for BSS color collisions to the wireless subsystem.
Add the required functionality to nl80211 that will notify about color
collisions, triggering the color change and notifying when it is completed.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: John Crispin <john@phrozen.org>
Link: https://lore.kernel.org/r/500b3582aec8fe2c42ef46f3117b148cb7cbceb5.1625247619.git.lorenzo@kernel.org
[remove unnecessary NULL initialisation]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 161cdf7df1a0..62dd8422e0dc 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1253,6 +1253,27 @@ struct cfg80211_csa_settings {
 };
 
 /**
+ * struct cfg80211_color_change_settings - color change settings
+ *
+ * Used for bss color change
+ *
+ * @beacon_color_change: beacon data while performing the color countdown
+ * @counter_offsets_beacon: offsets of the counters within the beacon (tail)
+ * @counter_offsets_presp: offsets of the counters within the probe response
+ * @beacon_next: beacon data to be used after the color change
+ * @count: number of beacons until the color change
+ * @color: the color used after the change
+ */
+struct cfg80211_color_change_settings {
+	struct cfg80211_beacon_data beacon_color_change;
+	u16 counter_offset_beacon;
+	u16 counter_offset_presp;
+	struct cfg80211_beacon_data beacon_next;
+	u8 count;
+	u8 color;
+};
+
+/**
  * struct iface_combination_params - input parameters for interface combinations
  *
  * Used to pass interface combination parameters
@@ -3995,6 +4016,8 @@ struct mgmt_frame_regs {
  *	given TIDs. This callback may sleep.
  *
  * @set_sar_specs: Update the SAR (TX power) settings.
+ *
+ * @color_change: Initiate a color change.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -4322,6 +4345,9 @@ struct cfg80211_ops {
 				    const u8 *peer, u8 tids);
 	int	(*set_sar_specs)(struct wiphy *wiphy,
 				 struct cfg80211_sar_specs *sar);
+	int	(*color_change)(struct wiphy *wiphy,
+				struct net_device *dev,
+				struct cfg80211_color_change_settings *params);
 };
 
 /*
@@ -8218,4 +8244,70 @@ void cfg80211_update_owe_info_event(struct net_device *netdev,
  */
 void cfg80211_bss_flush(struct wiphy *wiphy);
 
+/**
+ * cfg80211_bss_color_notify - notify about bss color event
+ * @dev: network device
+ * @gfp: allocation flags
+ * @cmd: the actual event we want to notify
+ * @count: the number of TBTTs until the color change happens
+ * @color_bitmap: representations of the colors that the local BSS is aware of
+ */
+int cfg80211_bss_color_notify(struct net_device *dev, gfp_t gfp,
+			      enum nl80211_commands cmd, u8 count,
+			      u64 color_bitmap);
+
+/**
+ * cfg80211_obss_color_collision_notify - notify about bss color collision
+ * @dev: network device
+ * @color_bitmap: representations of the colors that the local BSS is aware of
+ */
+static inline int cfg80211_obss_color_collision_notify(struct net_device *dev,
+						       u64 color_bitmap)
+{
+	return cfg80211_bss_color_notify(dev, GFP_KERNEL,
+					 NL80211_CMD_OBSS_COLOR_COLLISION,
+					 0, color_bitmap);
+}
+
+/**
+ * cfg80211_color_change_started_notify - notify color change start
+ * @dev: the device on which the color is switched
+ * @count: the number of TBTTs until the color change happens
+ *
+ * Inform the userspace about the color change that has started.
+ */
+static inline int cfg80211_color_change_started_notify(struct net_device *dev,
+						       u8 count)
+{
+	return cfg80211_bss_color_notify(dev, GFP_KERNEL,
+					 NL80211_CMD_COLOR_CHANGE_STARTED,
+					 count, 0);
+}
+
+/**
+ * cfg80211_color_change_aborted_notify - notify color change abort
+ * @dev: the device on which the color is switched
+ *
+ * Inform the userspace about the color change that has aborted.
+ */
+static inline int cfg80211_color_change_aborted_notify(struct net_device *dev)
+{
+	return cfg80211_bss_color_notify(dev, GFP_KERNEL,
+					 NL80211_CMD_COLOR_CHANGE_ABORTED,
+					 0, 0);
+}
+
+/**
+ * cfg80211_color_change_notify - notify color change completion
+ * @dev: the device on which the color was switched
+ *
+ * Inform the userspace about the color change that has completed.
+ */
+static inline int cfg80211_color_change_notify(struct net_device *dev)
+{
+	return cfg80211_bss_color_notify(dev, GFP_KERNEL,
+					 NL80211_CMD_COLOR_CHANGE_COMPLETED,
+					 0, 0);
+}
+
 #endif /* __NET_CFG80211_H */