wifi: cfg80211: add proximity detection capabilities to PMSR

Introduce Proximity Detection (PD) capabilities in Peer Measurement
Service (PMSR) as defined in the Wi-Fi Alliance specification
"Proximity Ranging (PR) Implementation Consideration Draft 1.9 Rev 1
section 3.3". This enables devices to advertise peer to peer ranging
support.

Restructure FTM capabilities in cfg80211_pmsr_capabilities to replace
the single support_rsta flag with nested ista and rsta sub-structs,
each carrying per-mode flags for Non-Trigger Based (NTB), Trigger Based
(TB), and EDCA based ranging. This allows drivers to advertise detailed
role and protocol support for both initiator and responder roles.

Add support to pass additional ISTA and RSTA role capabilities to
userspace using new nested ISTA_CAPS and RSTA_CAPS attributes. The
legacy RSTA_SUPPORT flag is retained for backward compatibility.

Add NL80211_PMSR_FTM_CAPA_ATTR_TYPE_CAPS nested attribute using the
nl80211_peer_measurement_ftm_type_capa enum with two sub-flags:
NL80211_PMSR_FTM_TYPE_CAPA_ATTR_INFRA_SUPPORT for STA-to-AP or
AP-to-STA ranging, and NL80211_PMSR_FTM_TYPE_CAPA_ATTR_PD_SUPPORT
for peer-to-peer ranging.

Add CONCURRENT_ISTA_RSTA_SUPPORT as a FTM capability flag indicating
the device can simultaneously act as initiator and responder in a
multi-peer measurement request.

Extend FTM capabilities with antenna configuration fields
(max_no_of_tx_antennas, max_no_of_rx_antennas) for the PR Element
during PASN negotiation, and ranging interval limits
(min_allowed_ranging_interval_edca, min_allowed_ranging_interval_ntb)
to advertise device timing constraints for EDCA and NTB-based ranging.

Update the FTM request validation path in pmsr.c to check RSTA
requests against the per-mode rsta capabilities (NTB, TB, EDCA),
rejecting requests for modes the device does not support.

Co-developed-by: Kavita Kavita <kavita.kavita@oss.qualcomm.com>
Signed-off-by: Kavita Kavita <kavita.kavita@oss.qualcomm.com>
Signed-off-by: Peddolla Harshavardhan Reddy <peddolla.reddy@oss.qualcomm.com>
Link: https://patch.msgid.link/20260420090856.2152905-6-peddolla.reddy@oss.qualcomm.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 704607824b8a..ea0acce724ca 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -8111,6 +8111,46 @@ enum nl80211_peer_measurement_attrs {
  *	This limits the allowed combinations of LTF repetitions and STS.
  * @NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT: flag attribute indicating the
  *	device supports operating as the RSTA in PMSR FTM request
+ * @NL80211_PMSR_FTM_CAPA_ATTR_ISTA_CAPS: nested attribute containing ISTA
+ *	(initiator) role capabilities. Uses the same sub-attributes as
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS: nested attribute containing RSTA
+ *	(responder) role capabilities.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_NTB: flag attribute (used inside
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_ISTA_CAPS or
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS) indicating NTB ranging support.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_TB: flag attribute (used inside
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_ISTA_CAPS or
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS) indicating TB ranging support.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_EDCA: flag attribute (used inside
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_ISTA_CAPS or
+ *	%NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS) indicating EDCA based ranging
+ *	support.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_TYPE_CAPS: nested attribute containing ranging
+ *	type capabilities. Uses sub-attributes from
+ *	&enum nl80211_peer_measurement_ftm_type_capa.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_CONCURRENT_ISTA_RSTA_SUPPORT: flag attribute
+ *	indicating that the device can simultaneously act as initiator and
+ *	responder in a multi-peer measurement request. Only valid if
+ *	@NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT is set.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_TX_ANTENNAS: u32 attribute indicating
+ *	the maximum number of transmit antennas supported for EDCA based ranging
+ *	(0 means unknown)
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_RX_ANTENNAS: u32 attribute indicating
+ *	the maximum number of receive antennas supported for EDCA based ranging
+ *	(0 means unknown)
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_EDCA: u32 attribute indicating
+ *	the minimum EDCA ranging interval supported by the device
+ *	in milli seconds. (0 means unknown). Applications can use this value
+ *	to estimate the burst period to be given in the FTM request for the
+ *	EDCA based ranging case. If non-zero, this value will be used to
+ *	validate the burst period in the FTM request.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_NTB: u32 attribute indicating
+ *	the minimum NTB ranging interval supported by the device
+ *	in milli seconds. (0 means unknown). Applications can use this value
+ *	to estimate the burst period to be given in the FTM request for the
+ *	NTB ranging case. If non-zero, this value will be used to validate
+ *	the nominal time in the FTM request.
  *
  * @NUM_NL80211_PMSR_FTM_CAPA_ATTR: internal
  * @NL80211_PMSR_FTM_CAPA_ATTR_MAX: highest attribute number
@@ -8136,6 +8176,17 @@ enum nl80211_peer_measurement_ftm_capa {
 	NL80211_PMSR_FTM_CAPA_ATTR_MAX_TOTAL_LTF_TX,
 	NL80211_PMSR_FTM_CAPA_ATTR_MAX_TOTAL_LTF_RX,
 	NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT,
+	NL80211_PMSR_FTM_CAPA_ATTR_ISTA_CAPS,
+	NL80211_PMSR_FTM_CAPA_ATTR_RSTA_CAPS,
+	NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_NTB,
+	NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_TB,
+	NL80211_PMSR_FTM_CAPA_ATTR_SUPPORT_EDCA,
+	NL80211_PMSR_FTM_CAPA_ATTR_TYPE_CAPS,
+	NL80211_PMSR_FTM_CAPA_ATTR_CONCURRENT_ISTA_RSTA_SUPPORT,
+	NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_TX_ANTENNAS,
+	NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_RX_ANTENNAS,
+	NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_EDCA,
+	NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_NTB,
 
 	/* keep last */
 	NUM_NL80211_PMSR_FTM_CAPA_ATTR,
@@ -8143,6 +8194,33 @@ enum nl80211_peer_measurement_ftm_capa {
 };
 
 /**
+ * enum nl80211_peer_measurement_ftm_type_capa - FTM ranging type capability
+ *	sub-attributes, used inside %NL80211_PMSR_FTM_CAPA_ATTR_TYPE_CAPS
+ * @__NL80211_PMSR_FTM_TYPE_CAPA_ATTR_INVALID: invalid
+ *
+ * @NL80211_PMSR_FTM_TYPE_CAPA_ATTR_INFRA_SUPPORT: flag attribute indicating
+ *	that the device supports infrastructure ranging (STA-to-AP or
+ *	AP-to-STA) as part of Proximity Detection
+ * @NL80211_PMSR_FTM_TYPE_CAPA_ATTR_PD_SUPPORT: flag attribute indicating that
+ *	the device supports peer-to-peer ranging as mentioned in the
+ *	specification "PR Implementation Consideration Draft 1.9 rev 1" where
+ *	PD stands for proximity detection
+ *
+ * @NUM_NL80211_PMSR_FTM_TYPE_CAPA_ATTR: internal
+ * @NL80211_PMSR_FTM_TYPE_CAPA_ATTR_MAX: highest attribute number
+ */
+enum nl80211_peer_measurement_ftm_type_capa {
+	__NL80211_PMSR_FTM_TYPE_CAPA_ATTR_INVALID,
+
+	NL80211_PMSR_FTM_TYPE_CAPA_ATTR_INFRA_SUPPORT,
+	NL80211_PMSR_FTM_TYPE_CAPA_ATTR_PD_SUPPORT,
+
+	/* keep last */
+	NUM_NL80211_PMSR_FTM_TYPE_CAPA_ATTR,
+	NL80211_PMSR_FTM_TYPE_CAPA_ATTR_MAX = NUM_NL80211_PMSR_FTM_TYPE_CAPA_ATTR - 1
+};
+
+/**
  * enum nl80211_peer_measurement_ftm_req - FTM request attributes
  * @__NL80211_PMSR_FTM_REQ_ATTR_INVALID: invalid
  *