cfg80211: support FTM responder configuration/statistics

Allow userspace to enable fine timing measurement responder
functionality with configurable lci/civic parameters in AP mode.
This can be done at AP start or changing beacon parameters.

A new EXT_FEATURE flag is introduced for drivers to advertise
the capability.

Also nl80211 API support for retrieving statistics is added.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
[remove unused cfg80211_ftm_responder_params, clarify docs,
 move validation into policy]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index cfc94178d608..dc6d5a1ef470 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1033,6 +1033,9 @@
  *	%NL80211_ATTR_CHANNEL_WIDTH,%NL80211_ATTR_NSS attributes with its
  *	address(specified in %NL80211_ATTR_MAC).
  *
+ * @NL80211_CMD_GET_FTM_RESPONDER_STATS: Retrieve FTM responder statistics, in
+ *	the %NL80211_ATTR_FTM_RESPONDER_STATS attribute.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -1245,6 +1248,8 @@ enum nl80211_commands {
 
 	NL80211_CMD_CONTROL_PORT_FRAME,
 
+	NL80211_CMD_GET_FTM_RESPONDER_STATS,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
@@ -2241,6 +2246,14 @@ enum nl80211_commands {
  *	association request when used with NL80211_CMD_NEW_STATION). Can be set
  *	only if %NL80211_STA_FLAG_WME is set.
  *
+ * @NL80211_ATTR_FTM_RESPONDER: nested attribute which user-space can include
+ *	in %NL80211_CMD_START_AP or %NL80211_CMD_SET_BEACON for fine timing
+ *	measurement (FTM) responder functionality and containing parameters as
+ *	possible, see &enum nl80211_ftm_responder_attr
+ *
+ * @NL80211_ATTR_FTM_RESPONDER_STATS: Nested attribute with FTM responder
+ *	statistics, see &enum nl80211_ftm_responder_stats.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2682,6 +2695,10 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_HE_CAPABILITY,
 
+	NL80211_ATTR_FTM_RESPONDER,
+
+	NL80211_ATTR_FTM_RESPONDER_STATS,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -5225,6 +5242,8 @@ enum nl80211_feature_flags {
  * @NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT: Driver/device can omit all data
  *	except for supported rates from the probe request content if requested
  *	by the %NL80211_SCAN_FLAG_MIN_PREQ_CONTENT flag.
+ * @NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER: Driver supports enabling fine
+ *	timing measurement responder role.
  *
  * @NL80211_EXT_FEATURE_CAN_REPLACE_PTK0: Driver/device confirm that they are
  *      able to rekey an in-use key correctly. Userspace must not rekey PTK keys
@@ -5269,6 +5288,7 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_SCAN_RANDOM_SN,
 	NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
 	NL80211_EXT_FEATURE_CAN_REPLACE_PTK0,
+	NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,
@@ -5808,4 +5828,74 @@ enum nl80211_external_auth_action {
 	NL80211_EXTERNAL_AUTH_ABORT,
 };
 
+/**
+ * enum nl80211_ftm_responder_attributes - fine timing measurement
+ *	responder attributes
+ * @__NL80211_FTM_RESP_ATTR_INVALID: Invalid
+ * @NL80211_FTM_RESP_ATTR_ENABLED: FTM responder is enabled
+ * @NL80211_FTM_RESP_ATTR_LCI: The content of Measurement Report Element
+ *	(9.4.2.22 in 802.11-2016) with type 8 - LCI (9.4.2.22.10)
+ * @NL80211_FTM_RESP_ATTR_CIVIC: The content of Measurement Report Element
+ *	(9.4.2.22 in 802.11-2016) with type 11 - Civic (Section 9.4.2.22.13)
+ * @__NL80211_FTM_RESP_ATTR_LAST: Internal
+ * @NL80211_FTM_RESP_ATTR_MAX: highest FTM responder attribute.
+ */
+enum nl80211_ftm_responder_attributes {
+	__NL80211_FTM_RESP_ATTR_INVALID,
+
+	NL80211_FTM_RESP_ATTR_ENABLED,
+	NL80211_FTM_RESP_ATTR_LCI,
+	NL80211_FTM_RESP_ATTR_CIVICLOC,
+
+	/* keep last */
+	__NL80211_FTM_RESP_ATTR_LAST,
+	NL80211_FTM_RESP_ATTR_MAX = __NL80211_FTM_RESP_ATTR_LAST - 1,
+};
+
+/*
+ * enum nl80211_ftm_responder_stats - FTM responder statistics
+ *
+ * These attribute types are used with %NL80211_ATTR_FTM_RESPONDER_STATS
+ * when getting FTM responder statistics.
+ *
+ * @__NL80211_FTM_STATS_INVALID: attribute number 0 is reserved
+ * @NL80211_FTM_STATS_SUCCESS_NUM: number of FTM sessions in which all frames
+ *	were ssfully answered (u32)
+ * @NL80211_FTM_STATS_PARTIAL_NUM: number of FTM sessions in which part of the
+ *	frames were successfully answered (u32)
+ * @NL80211_FTM_STATS_FAILED_NUM: number of failed FTM sessions (u32)
+ * @NL80211_FTM_STATS_ASAP_NUM: number of ASAP sessions (u32)
+ * @NL80211_FTM_STATS_NON_ASAP_NUM: number of non-ASAP sessions (u32)
+ * @NL80211_FTM_STATS_TOTAL_DURATION_MSEC: total sessions durations - gives an
+ *	indication of how much time the responder was busy (u64, msec)
+ * @NL80211_FTM_STATS_UNKNOWN_TRIGGERS_NUM: number of unknown FTM triggers -
+ *	triggers from initiators that didn't finish successfully the negotiation
+ *	phase with the responder (u32)
+ * @NL80211_FTM_STATS_RESCHEDULE_REQUESTS_NUM: number of FTM reschedule requests
+ *	- initiator asks for a new scheduling although it already has scheduled
+ *	FTM slot (u32)
+ * @NL80211_FTM_STATS_OUT_OF_WINDOW_TRIGGERS_NUM: number of FTM triggers out of
+ *	scheduled window (u32)
+ * @NL80211_FTM_STATS_PAD: used for padding, ignore
+ * @__NL80211_TXQ_ATTR_AFTER_LAST: Internal
+ * @NL80211_FTM_STATS_MAX: highest possible FTM responder stats attribute
+ */
+enum nl80211_ftm_responder_stats {
+	__NL80211_FTM_STATS_INVALID,
+	NL80211_FTM_STATS_SUCCESS_NUM,
+	NL80211_FTM_STATS_PARTIAL_NUM,
+	NL80211_FTM_STATS_FAILED_NUM,
+	NL80211_FTM_STATS_ASAP_NUM,
+	NL80211_FTM_STATS_NON_ASAP_NUM,
+	NL80211_FTM_STATS_TOTAL_DURATION_MSEC,
+	NL80211_FTM_STATS_UNKNOWN_TRIGGERS_NUM,
+	NL80211_FTM_STATS_RESCHEDULE_REQUESTS_NUM,
+	NL80211_FTM_STATS_OUT_OF_WINDOW_TRIGGERS_NUM,
+	NL80211_FTM_STATS_PAD,
+
+	/* keep last */
+	__NL80211_FTM_STATS_AFTER_LAST,
+	NL80211_FTM_STATS_MAX = __NL80211_FTM_STATS_AFTER_LAST - 1
+};
+
 #endif /* __LINUX_NL80211_H */