Bluetooth: MGMT: Add management security level changed event

index 788d6600f500..ad46140590be 100644
@@ -2254,6 +2254,8 @@ static inline void hci_auth_cfm(struct hci_conn *conn, __u8 status)
 		conn->security_cfm_cb(conn, status);
 }
 
+void mgmt_security_level_changed(struct hci_conn *conn);
+
 static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status)
 {
 	struct hci_cb *cb;

@@ -2276,11 +2278,20 @@ static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status)
 		encrypt = 0x01;
 
 	if (!status) {
-		if (conn->sec_level == BT_SECURITY_SDP)
+		bool sec_level_changed  = false;
+
+		if (conn->sec_level == BT_SECURITY_SDP) {
 			conn->sec_level = BT_SECURITY_LOW;
+			sec_level_changed = true;
+		}
 
-		if (conn->pending_sec_level > conn->sec_level)
+		if (conn->pending_sec_level > conn->sec_level) {
 			conn->sec_level = conn->pending_sec_level;
+			sec_level_changed = true;
+		}
+
+		if (sec_level_changed)
+			mgmt_security_level_changed(conn);
 	}
 
 	mutex_lock(&hci_cb_list_lock);

index 1e22eab1081c..7d9cec30bf08 100644
@@ -1221,3 +1221,17 @@ struct mgmt_ev_conn_subrate {
 	__le16	cont_num;
 	__le16	supv_timeout;
 } __packed;
+
+#define MGMT_CONN_SEC_ENCRYPT_NONE		0x00
+#define MGMT_CONN_SEC_ENCRYPT_E0		0x01
+#define MGMT_CONN_SEC_ENCRYPT_AES_CCM		0x02
+
+#define MGMT_SEC_LEVEL_CHANGED_PARAM_LEVEL	0x0000
+#define MGMT_SEC_LEVEL_CHANGED_PARAM_ENC_TYPE	0x0001
+
+#define MGMT_EV_SECURITY_LEVEL_CHANGED		0x0034
+struct mgmt_ev_security_level_changed {
+	struct mgmt_addr_info addr;
+	__u8	tlv_count;
+	__u8	tlv_data[] __counted_by(tlv_count);
+} __packed;

index 96195d2fd10f..95bf63cbff94 100644
@@ -1225,6 +1225,11 @@ static void hci_conn_unlink(struct hci_conn *conn)
 	if (!conn->parent) {
 		struct hci_link *link, *t;
 
+		conn->sec_level = BT_SECURITY_SDP;
+		clear_bit(HCI_CONN_ENCRYPT, &conn->flags);
+		clear_bit(HCI_CONN_AES_CCM, &conn->flags);
+		mgmt_security_level_changed(conn);
+
 		list_for_each_entry_safe(link, t, &conn->link_list, list) {
 			struct hci_conn *child = link->conn;
 

@@ -1536,6 +1541,7 @@ struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 	}
 
 	conn->sec_level = BT_SECURITY_LOW;
+	mgmt_security_level_changed(conn);
 	conn->conn_timeout = conn_timeout;
 	conn->le_adv_phy = phy;
 	conn->le_adv_sec_phy = sec_phy;

@@ -1763,6 +1769,7 @@ struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
 	conn->state = BT_CONNECT;
 	set_bit(HCI_CONN_SCANNING, &conn->flags);
 	conn->sec_level = BT_SECURITY_LOW;
+	mgmt_security_level_changed(conn);
 	conn->pending_sec_level = sec_level;
 	conn->conn_timeout = conn_timeout;
 	conn->conn_reason = conn_reason;

@@ -1811,6 +1818,7 @@ struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 		int err;
 
 		acl->sec_level = BT_SECURITY_LOW;
+		mgmt_security_level_changed(acl);
 		acl->pending_sec_level = sec_level;
 		acl->auth_type = auth_type;
 		acl->conn_timeout = timeout;

index 5ac2357e92c9..4d77c1c99e6c 100644
@@ -755,6 +755,7 @@ static u8 hci_cc_read_enc_key_size(struct hci_dev *hdev, void *data,
 			status = HCI_ERROR_AUTH_FAILURE;
 			clear_bit(HCI_CONN_ENCRYPT, &conn->flags);
 			clear_bit(HCI_CONN_AES_CCM, &conn->flags);
+			mgmt_security_level_changed(conn);
 		}
 
 		/* Update the key encryption size with the connection one */

@@ -3210,6 +3211,8 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
 	}
 
 	if (!status) {
+		bool encrypt_change = false;
+
 		status = hci_conn_set_handle(conn, __le16_to_cpu(ev->handle));
 		if (status)
 			goto done;

@@ -3232,8 +3235,10 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
 		if (test_bit(HCI_AUTH, &hdev->flags))
 			set_bit(HCI_CONN_AUTH, &conn->flags);
 
-		if (test_bit(HCI_ENCRYPT, &hdev->flags))
+		if (test_bit(HCI_ENCRYPT, &hdev->flags)) {
 			set_bit(HCI_CONN_ENCRYPT, &conn->flags);
+			encrypt_change = true;
+		}
 
 		/* "Link key request" completed ahead of "connect request" completes */
 		if (ev->encr_mode == 1 && !test_bit(HCI_CONN_ENCRYPT, &conn->flags) &&

@@ -3243,11 +3248,15 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
 			key = hci_find_link_key(hdev, &ev->bdaddr);
 			if (key) {
 				set_bit(HCI_CONN_ENCRYPT, &conn->flags);
+				encrypt_change = true;
 				hci_read_enc_key_size(hdev, conn);
 				hci_encrypt_cfm(conn, ev->status);
 			}
 		}
 
+		if (encrypt_change)
+			mgmt_security_level_changed(conn);
+
 		/* Get remote features */
 		if (conn->type == ACL_LINK) {
 			struct hci_cp_read_remote_features cp;

@@ -3517,6 +3526,7 @@ static void hci_auth_complete_evt(struct hci_dev *hdev, void *data,
 		clear_bit(HCI_CONN_AUTH_FAILURE, &conn->flags);
 		set_bit(HCI_CONN_AUTH, &conn->flags);
 		conn->sec_level = conn->pending_sec_level;
+		mgmt_security_level_changed(conn);
 	} else {
 		if (ev->status == HCI_ERROR_PIN_OR_KEY_MISSING)
 			set_bit(HCI_CONN_AUTH_FAILURE, &conn->flags);

@@ -3632,9 +3642,12 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 			if ((conn->type == ACL_LINK && ev->encrypt == 0x02) ||
 			    conn->type == LE_LINK)
 				set_bit(HCI_CONN_AES_CCM, &conn->flags);
+
+			mgmt_security_level_changed(conn);
 		} else {
 			clear_bit(HCI_CONN_ENCRYPT, &conn->flags);
 			clear_bit(HCI_CONN_AES_CCM, &conn->flags);
+			mgmt_security_level_changed(conn);
 		}
 	}
 

@@ -5228,8 +5241,10 @@ static void hci_key_refresh_complete_evt(struct hci_dev *hdev, void *data,
 	if (conn->type != LE_LINK)
 		goto unlock;
 
-	if (!ev->status)
+	if (!ev->status) {
 		conn->sec_level = conn->pending_sec_level;
+		mgmt_security_level_changed(conn);
+	}
 
 	clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 

@@ -5861,6 +5876,7 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
 	mgmt_device_connected(hdev, conn, NULL, 0);
 
 	conn->sec_level = BT_SECURITY_LOW;
+	mgmt_security_level_changed(conn);
 	conn->state = BT_CONFIG;
 
 	/* Store current advertising instance as connection advertising instance

index 9d3de5a0b8ee..25dd3a36725c 100644
@@ -177,6 +177,7 @@ static const u16 mgmt_events[] = {
 	MGMT_EV_CONTROLLER_RESUME,
 	MGMT_EV_ADV_MONITOR_DEVICE_FOUND,
 	MGMT_EV_ADV_MONITOR_DEVICE_LOST,
+	MGMT_EV_SECURITY_LEVEL_CHANGED,
 };
 
 static const u16 mgmt_untrusted_commands[] = {

@@ -10822,6 +10823,45 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 	mgmt_adv_monitor_device_found(hdev, bdaddr, report_device, skb, NULL);
 }
 
+void mgmt_security_level_changed(struct hci_conn *conn)
+{
+	struct mgmt_ev_security_level_changed *ev;
+	struct mgmt_tlv *tlv;
+	u8 *tlv_data;
+	u8 tlv_len;
+
+	tlv_len = 2 * (sizeof(*tlv) + sizeof(__u8));
+	ev = kzalloc_flex(*ev, tlv_data, tlv_len, GFP_ATOMIC);
+	if (!ev)
+		return;
+
+	bacpy(&ev->addr.bdaddr, &conn->dst);
+	ev->addr.type = link_to_bdaddr(conn->type, conn->dst_type);
+	ev->tlv_count = 2;
+
+	tlv_data = ev->tlv_data;
+	tlv = (void *)tlv_data;
+	tlv->type = cpu_to_le16(MGMT_SEC_LEVEL_CHANGED_PARAM_LEVEL);
+	tlv->length = sizeof(__u8);
+	tlv->value[0] = conn->sec_level;
+
+	tlv_data += sizeof(*tlv) + sizeof(__u8);
+	tlv = (void *)tlv_data;
+	tlv->type = cpu_to_le16(MGMT_SEC_LEVEL_CHANGED_PARAM_ENC_TYPE);
+	tlv->length = sizeof(__u8);
+	if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+		tlv->value[0] = MGMT_CONN_SEC_ENCRYPT_NONE;
+	else if (test_bit(HCI_CONN_AES_CCM, &conn->flags))
+		tlv->value[0] = MGMT_CONN_SEC_ENCRYPT_AES_CCM;
+	else
+		tlv->value[0] = MGMT_CONN_SEC_ENCRYPT_E0;
+
+	mgmt_event(MGMT_EV_SECURITY_LEVEL_CHANGED, conn->hdev, ev,
+		   struct_size(ev, tlv_data, tlv_len), NULL);
+
+	kfree(ev);
+}
+
 void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 		      u8 addr_type, s8 rssi, u8 *name, u8 name_len)
 {