wifi: cfg80211: add PD-specific preamble and bandwidth capabilities

Devices may support different preamble and bandwidth configurations
for proximity detection (PD) ranging versus standard ranging. Add
separate pd_preambles and pd_bandwidths fields to
cfg80211_pmsr_capabilities to allow drivers to advertise PD-specific
capabilities.

Expose these over nl80211 using new attributes
NL80211_PMSR_FTM_CAPA_ATTR_PD_PREAMBLES and
NL80211_PMSR_FTM_CAPA_ATTR_PD_BANDWIDTHS, advertised only when
pd_support is set.

For PD requests, validate bandwidth and preamble against pd_bandwidths
and pd_preambles. For non-PD requests, validate against the existing
bandwidths and preambles fields.

Signed-off-by: Peddolla Harshavardhan Reddy <peddolla.reddy@oss.qualcomm.com>
Link: https://patch.msgid.link/20260420090856.2152905-11-peddolla.reddy@oss.qualcomm.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 47 insertions, 2 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 87e848750339..f5a47a0c7532 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -6053,6 +6053,10 @@ cfg80211_get_iftype_ext_capa(struct wiphy *wiphy, enum nl80211_iftype type);
  * @ftm.concurrent_ista_rsta_support: indicates if the device can
  *	simultaneously act as initiator and responder in a multi-peer
  *	measurement request. Only valid if @ftm.rsta_support is set.
+ * @ftm.pd_preambles: bitmap of preambles supported (&enum nl80211_preamble)
+ *	for PD ranging requests. Ignored if @ftm.type.pd_support is not set.
+ * @ftm.pd_bandwidths: bitmap of bandwidths supported (&enum nl80211_chan_width)
+ *	for PD ranging requests. Ignored if @ftm.type.pd_support is not set.
  */
 struct cfg80211_pmsr_capabilities {
 	unsigned int max_peers;
@@ -6099,6 +6103,8 @@ struct cfg80211_pmsr_capabilities {
 			   pd_support:1;
 		} type;
 		u8 concurrent_ista_rsta_support:1;
+		u32 pd_preambles;
+		u32 pd_bandwidths;
 	} ftm;
 };
 
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 02fe42b4f29c..5bef8fd25270 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -8189,6 +8189,14 @@ enum nl80211_peer_measurement_attrs {
  *	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.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_PD_PREAMBLES: u32 bitmap of values from
+ *	&enum nl80211_preamble indicating the supported preambles for PD
+ *	ranging requests. Only valid if %NL80211_PMSR_FTM_TYPE_CAPA_ATTR_PD_SUPPORT
+ *	is set.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_PD_BANDWIDTHS: u32 bitmap of values from
+ *	&enum nl80211_chan_width indicating the supported channel bandwidths
+ *	for PD ranging requests. Only valid if
+ *	%NL80211_PMSR_FTM_TYPE_CAPA_ATTR_PD_SUPPORT is set.
  *
  * @NUM_NL80211_PMSR_FTM_CAPA_ATTR: internal
  * @NL80211_PMSR_FTM_CAPA_ATTR_MAX: highest attribute number
@@ -8225,6 +8233,8 @@ enum nl80211_peer_measurement_ftm_capa {
 	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,
+	NL80211_PMSR_FTM_CAPA_ATTR_PD_PREAMBLES,
+	NL80211_PMSR_FTM_CAPA_ATTR_PD_BANDWIDTHS,
 
 	/* keep last */
 	NUM_NL80211_PMSR_FTM_CAPA_ATTR,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ae968d53fcea..84f17032fdd9 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2615,6 +2615,18 @@ nl80211_send_pmsr_ftm_capa(const struct cfg80211_pmsr_capabilities *cap,
 	if (cap->ftm.concurrent_ista_rsta_support &&
 	    nla_put_flag(msg, NL80211_PMSR_FTM_CAPA_ATTR_CONCURRENT_ISTA_RSTA_SUPPORT))
 		return -ENOBUFS;
+
+	if (cap->ftm.type.pd_support) {
+		if (cap->ftm.pd_preambles &&
+		    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_PD_PREAMBLES,
+				cap->ftm.pd_preambles))
+			return -ENOBUFS;
+		if (cap->ftm.pd_bandwidths &&
+		    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_PD_BANDWIDTHS,
+				cap->ftm.pd_bandwidths))
+			return -ENOBUFS;
+	}
+
 	nla_nest_end(msg, ftm);
 	return 0;
 }
diff --git a/net/wireless/pmsr.c b/net/wireless/pmsr.c
index 2d6ace7f048d..8b7843f75db2 100644
--- a/net/wireless/pmsr.c
+++ b/net/wireless/pmsr.c
@@ -17,11 +17,19 @@ static int pmsr_parse_ftm(struct cfg80211_registered_device *rdev,
 	u32 preamble = NL80211_PREAMBLE_DMG; /* only optional in DMG */
 
 	/* validate existing data */
-	if (!(rdev->wiphy.pmsr_capa->ftm.bandwidths & BIT(out->chandef.width))) {
+	if (out->ftm.request_type == NL80211_PMSR_FTM_REQ_TYPE_INFRA &&
+	    !(capa->ftm.bandwidths & BIT(out->chandef.width))) {
 		NL_SET_ERR_MSG(info->extack, "FTM: unsupported bandwidth");
 		return -EINVAL;
 	}
 
+	if (out->ftm.request_type == NL80211_PMSR_FTM_REQ_TYPE_PD &&
+	    !(capa->ftm.pd_bandwidths & BIT(out->chandef.width))) {
+		NL_SET_ERR_MSG(info->extack,
+			       "FTM: unsupported bandwidth for PD request");
+		return -EINVAL;
+	}
+
 	/* no validation needed - was already done via nested policy */
 	nla_parse_nested_deprecated(tb, NL80211_PMSR_FTM_REQ_ATTR_MAX, ftmreq,
 				    NULL, NULL);
@@ -44,13 +52,22 @@ static int pmsr_parse_ftm(struct cfg80211_registered_device *rdev,
 		}
 	}
 
-	if (!(capa->ftm.preambles & BIT(preamble))) {
+	if (out->ftm.request_type == NL80211_PMSR_FTM_REQ_TYPE_INFRA &&
+	    !(capa->ftm.preambles & BIT(preamble))) {
 		NL_SET_ERR_MSG_ATTR(info->extack,
 				    tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE],
 				    "FTM: invalid preamble");
 		return -EINVAL;
 	}
 
+	if (out->ftm.request_type == NL80211_PMSR_FTM_REQ_TYPE_PD &&
+	    !(capa->ftm.pd_preambles & BIT(preamble))) {
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE],
+				    "FTM: invalid preamble for PD request");
+		return -EINVAL;
+	}
+
 	out->ftm.preamble = preamble;
 
 	out->ftm.burst_period = 0;