nl80211: MBSSID and EMA support in AP mode

Add new attributes to configure support for multiple BSSID
and advanced multi-BSSID advertisements (EMA) in AP mode.

- NL80211_ATTR_MBSSID_CONFIG used for per interface configuration.
- NL80211_ATTR_MBSSID_ELEMS used to MBSSID elements for beacons.

Memory for the elements is allocated dynamically. This change frees
the memory in existing functions which call nl80211_parse_beacon(),
a comment is added to indicate the new references to do the same.

Signed-off-by: John Crispin <john@phrozen.org>
Co-developed-by: Aloka Dixit <alokad@codeaurora.org>
Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
Link: https://lore.kernel.org/r/20210916025437.29138-2-alokad@codeaurora.org
[don't leave ERR_PTR hanging around]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 125f563d66a1..e9e313aa991f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1057,6 +1057,36 @@ struct cfg80211_crypto_settings {
 };
 
 /**
+ * struct cfg80211_mbssid_config - AP settings for multi bssid
+ *
+ * @tx_wdev: pointer to the transmitted interface in the MBSSID set
+ * @index: index of this AP in the multi bssid group.
+ * @ema: set to true if the beacons should be sent out in EMA mode.
+ */
+struct cfg80211_mbssid_config {
+	struct wireless_dev *tx_wdev;
+	u8 index;
+	bool ema;
+};
+
+/**
+ * struct cfg80211_mbssid_elems - Multiple BSSID elements
+ *
+ * @cnt: Number of elements in array %elems.
+ *
+ * @elem: Array of multiple BSSID element(s) to be added into Beacon frames.
+ * @elem.data: Data for multiple BSSID elements.
+ * @elem.len: Length of data.
+ */
+struct cfg80211_mbssid_elems {
+	u8 cnt;
+	struct {
+		const u8 *data;
+		size_t len;
+	} elem[];
+};
+
+/**
  * struct cfg80211_beacon_data - beacon data
  * @head: head portion of beacon (before TIM IE)
  *	or %NULL if not changed
@@ -1074,6 +1104,7 @@ struct cfg80211_crypto_settings {
  * @assocresp_ies_len: length of assocresp_ies in octets
  * @probe_resp_len: length of probe response template (@probe_resp)
  * @probe_resp: probe response template (AP mode only)
+ * @mbssid_ies: multiple BSSID 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
@@ -1091,6 +1122,7 @@ struct cfg80211_beacon_data {
 	const u8 *probe_resp;
 	const u8 *lci;
 	const u8 *civicloc;
+	struct cfg80211_mbssid_elems *mbssid_ies;
 	s8 ftm_responder;
 
 	size_t head_len, tail_len;
@@ -1205,6 +1237,7 @@ enum cfg80211_ap_settings_flags {
  * @he_oper: HE operation IE (or %NULL if HE isn't enabled)
  * @fils_discovery: FILS discovery transmission parameters
  * @unsol_bcast_probe_resp: Unsolicited broadcast probe response parameters
+ * @mbssid_config: AP settings for multiple bssid
  */
 struct cfg80211_ap_settings {
 	struct cfg80211_chan_def chandef;
@@ -1237,6 +1270,7 @@ struct cfg80211_ap_settings {
 	struct cfg80211_he_bss_color he_bss_color;
 	struct cfg80211_fils_discovery fils_discovery;
 	struct cfg80211_unsol_bcast_probe_resp unsol_bcast_probe_resp;
+	struct cfg80211_mbssid_config mbssid_config;
 };
 
 /**
@@ -5003,6 +5037,13 @@ struct wiphy_iftype_akm_suites {
  *	%NL80211_TID_CONFIG_ATTR_RETRY_LONG attributes
  * @sar_capa: SAR control capabilities
  * @rfkill: a pointer to the rfkill structure
+ *
+ * @mbssid_max_interfaces: maximum number of interfaces supported by the driver
+ *	in a multiple BSSID set. This field must be set to a non-zero value
+ *	by the driver to advertise MBSSID support.
+ * @mbssid_max_ema_profile_periodicity: maximum profile periodicity supported by
+ *	the driver. Setting this field to a non-zero value indicates that the
+ *	driver supports enhanced multi-BSSID advertisements (EMA AP).
  */
 struct wiphy {
 	struct mutex mtx;
@@ -5147,6 +5188,9 @@ struct wiphy {
 
 	struct rfkill *rfkill;
 
+	u8 mbssid_max_interfaces;
+	u8 ema_max_profile_periodicity;
+
 	char priv[] __aligned(NETDEV_ALIGN);
 };