qcacmn: Add support to filter Aps based on dot11mode

Add support to filter APs based on dot11mode such
as connect only 11N/11AC/11AX capable APs.

Change-Id: I0046c726d944dd08453c19086282e32d0599ddac
CRs-Fixed: 2769979

umac/scan/core/src/wlan_scan_filter.c

@@ -590,6 +590,41 @@ static inline bool scm_is_fils_config_match(struct scan_filter *filter,
 }
 #endif
 
+static bool scm_check_dot11mode(struct scan_cache_entry *db_entry,
+				struct scan_filter *filter)
+{
+	switch (filter->dot11mode) {
+	case ALLOW_ALL:
+		break;
+	case ALLOW_11N_ONLY:
+		if (!util_scan_entry_htcap(db_entry)) {
+			scm_debug(QDF_MAC_ADDR_FMT ": Ignore as dot11mode(HT only) didn't match",
+				  QDF_MAC_ADDR_REF(db_entry->bssid.bytes));
+			return false;
+		}
+		break;
+	case ALLOW_11AC_ONLY:
+		if (!util_scan_entry_vhtcap(db_entry)) {
+			scm_debug(QDF_MAC_ADDR_FMT ": Ignore as dot11mode(VHT only) didn't match",
+				  QDF_MAC_ADDR_REF(db_entry->bssid.bytes));
+			return false;
+		}
+		break;
+	case ALLOW_11AX_ONLY:
+		if (!util_scan_entry_hecap(db_entry)) {
+			scm_debug(QDF_MAC_ADDR_FMT ": Ignore as dot11mode(HE only) didn't match",
+				  QDF_MAC_ADDR_REF(db_entry->bssid.bytes));
+			return false;
+		}
+		break;
+	default:
+		scm_debug("Invalid dot11mode filter passed %d",
+			  filter->dot11mode);
+	}
+
+	return true;
+}
+
 bool scm_filter_match(struct wlan_objmgr_psoc *psoc,
 		      struct scan_cache_entry *db_entry,
 		      struct scan_filter *filter,
@@ -604,6 +639,9 @@ bool scm_filter_match(struct wlan_objmgr_psoc *psoc,
 	if (!def_param)
 		return false;
 
+	if (filter->dot11mode && !scm_check_dot11mode(db_entry, filter))
+		return false;
+
 	if (filter->age_threshold && filter->age_threshold <
 					util_scan_entry_age(db_entry))
 		return false;

umac/scan/dispatcher/inc/wlan_scan_public_structs.h

@@ -473,6 +473,20 @@ struct fils_filter_info {
 struct filter_arg;
 typedef struct filter_arg *bss_filter_arg_t;
 
+/**
+ * enum dot11_mode_filter - Filter APs according to dot11mode
+ * @ALLOW_ALL: ignore check
+ * @ALLOW_11N_ONLY: allow only 11n AP
+ * @ALLOW_11AC_ONLY: allow only 11ac AP
+ * @ALLOW_11AX_ONLY: allow only 11ax AP
+ */
+enum dot11_mode_filter {
+	ALLOW_ALL,
+	ALLOW_11N_ONLY,
+	ALLOW_11AC_ONLY,
+	ALLOW_11AX_ONLY,
+};
+
 /**
  * struct scan_filter: scan filter
  * @enable_adaptive_11r:    flag to check if adaptive 11r ini is enabled
@@ -487,8 +501,7 @@ typedef struct filter_arg *bss_filter_arg_t;
  * @num_of_ssid: number of ssid
  * @num_of_channels: number of  channels
  * @pmf_cap: Pmf capability
- * @dot11_mode: operating modes 0 mean any
- *              11a , 11g, 11n , 11ac , 11b etc
+ * @dot11mode: Filter APs based upon dot11mode
  * @band: to get specific band 2.4G, 5G or 4.9 G
  * @rssi_threshold: AP having RSSI greater than
  *                  rssi threasholed (ignored if set 0)
@@ -519,7 +532,7 @@ struct scan_filter {
 	uint8_t num_of_ssid;
 	uint16_t num_of_channels;
 	enum wlan_pmf_cap pmf_cap;
-	enum wlan_phymode dot11_mode;
+	enum dot11_mode_filter dot11mode;
 	enum wlan_band band;
 	uint8_t rssi_threshold;
 	uint32_t mobility_domain;