cfg80211: support RNR for EMA AP

As per IEEE Std 802.11ax-2021, 11.1.3.8.3 Discovery of a nontransmitted
BSSID profile, an EMA AP that transmits a Beacon frame carrying a partial
list of nontransmitted BSSID profiles should include in the frame
a Reduced Neighbor Report element carrying information for at least the
nontransmitted BSSIDs that are not present in the Multiple BSSID element
carried in that frame.
Add new nested attribute NL80211_ATTR_EMA_RNR_ELEMS to support the above.
Number of RNR elements must be more than or equal to the number of
MBSSID elements. This attribute can be used only when EMA is enabled.
Userspace is responsible for splitting the RNR into multiple elements such
that each element excludes the non-transmitting profiles already included
in the MBSSID element (%NL80211_ATTR_MBSSID_ELEMS) at the same index.
Each EMA beacon will be generated by adding MBSSID and RNR elements
at the same index. If the userspace provides more RNR elements than the
number of MBSSID elements then these will be added in every EMA beacon.

Signed-off-by: Aloka Dixit <quic_alokad@quicinc.com>
Link: https://lore.kernel.org/r/20230323113801.6903-2-quic_alokad@quicinc.com
[Johannes: validate elements]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 32 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 86cb048dc924..3cf236520288 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1179,6 +1179,23 @@ struct cfg80211_mbssid_elems {
 };
 
 /**
+ * struct cfg80211_rnr_elems - Reduced neighbor report (RNR) elements
+ *
+ * @cnt: Number of elements in array %elems.
+ *
+ * @elem: Array of RNR element(s) to be added into Beacon frames.
+ * @elem.data: Data for RNR elements.
+ * @elem.len: Length of data.
+ */
+struct cfg80211_rnr_elems {
+	u8 cnt;
+	struct {
+		const u8 *data;
+		size_t len;
+	} elem[];
+};
+
+/**
  * struct cfg80211_beacon_data - beacon data
  * @link_id: the link ID for the AP MLD link sending this beacon
  * @head: head portion of beacon (before TIM IE)
@@ -1198,6 +1215,7 @@ struct cfg80211_mbssid_elems {
  * @probe_resp_len: length of probe response template (@probe_resp)
  * @probe_resp: probe response template (AP mode only)
  * @mbssid_ies: multiple BSSID elements
+ * @rnr_ies: reduced neighbor report elements
  * @ftm_responder: enable FTM responder functionality; -1 for no change
  *	(which also implies no change in LCI/civic location data)
  * @lci: Measurement Report element content, starting with Measurement Token
@@ -1221,6 +1239,7 @@ struct cfg80211_beacon_data {
 	const u8 *lci;
 	const u8 *civicloc;
 	struct cfg80211_mbssid_elems *mbssid_ies;
+	struct cfg80211_rnr_elems *rnr_ies;
 	s8 ftm_responder;
 
 	size_t head_len, tail_len;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 14e958a32b84..cf4fb981e131 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2794,6 +2794,17 @@ enum nl80211_commands {
  * @NL80211_ATTR_HW_TIMESTAMP_ENABLED: Indicates whether HW timestamping should
  *	be enabled or not (flag attribute).
  *
+ * @NL80211_ATTR_EMA_RNR_ELEMS: Optional nested attribute for
+ *	reduced neighbor report (RNR) elements. This attribute can be used
+ *	only when NL80211_MBSSID_CONFIG_ATTR_EMA is enabled.
+ *	Userspace is responsible for splitting the RNR into multiple
+ *	elements such that each element excludes the non-transmitting
+ *	profiles already included in the MBSSID element
+ *	(%NL80211_ATTR_MBSSID_ELEMS) at the same index. Each EMA beacon
+ *	will be generated by adding MBSSID and RNR elements at the same
+ *	index. If the userspace includes more RNR elements than number of
+ *	MBSSID elements then these will be added in every EMA beacon.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3328,6 +3339,8 @@ enum nl80211_attrs {
 	NL80211_ATTR_MAX_HW_TIMESTAMP_PEERS,
 	NL80211_ATTR_HW_TIMESTAMP_ENABLED,
 
+	NL80211_ATTR_EMA_RNR_ELEMS,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,