Bluetooth: Add a convenience function to check for SSP enabled

It's a very common test to see if both the local and the remote device
have SSP enabled. By creating a simple function to test this we can
shorten many if-statements in the code.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -411,6 +411,13 @@ enum {
 	HCI_CONN_REMOTE_OOB,
 };
 
+static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
+{
+	struct hci_dev *hdev = conn->hdev;
+	return (test_bit(HCI_SSP_ENABLED, &hdev->flags) &&
+				test_bit(HCI_CONN_SSP_ENABLED, &conn->flags));
+}
+
 static inline void hci_conn_hash_init(struct hci_dev *hdev)
 {
 	struct hci_conn_hash *h = &hdev->conn_hash;

net/bluetooth/hci_conn.c

@@ -608,9 +608,7 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
 {
 	BT_DBG("conn %p", conn);
 
-	if (test_bit(HCI_CONN_SSP_ENABLED, &conn->flags) &&
-			test_bit(HCI_SSP_ENABLED, &conn->hdev->dev_flags) &&
-			!(conn->link_mode & HCI_LM_ENCRYPT))
+	if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 		return 0;
 
 	return 1;
@@ -672,9 +670,7 @@ int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 
 	/* For non 2.1 devices and low security level we don't need the link
 	   key. */
-	if (sec_level == BT_SECURITY_LOW &&
-			(!test_bit(HCI_CONN_SSP_ENABLED, &conn->flags) ||
-			!test_bit(HCI_SSP_ENABLED, &conn->hdev->dev_flags)))
+	if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 		return 1;
 
 	/* For other security levels we need the link key. */

net/bluetooth/hci_event.c

@@ -1270,8 +1270,7 @@ static int hci_outgoing_auth_needed(struct hci_dev *hdev,
 
 	/* Only request authentication for SSP connections or non-SSP
 	 * devices with sec_level HIGH or if MITM protection is requested */
-	if (!(test_bit(HCI_SSP_ENABLED, &hdev->dev_flags) &&
-			test_bit(HCI_CONN_SSP_ENABLED, &conn->flags)) &&
+	if (!hci_conn_ssp_enabled(conn) &&
 				conn->pending_sec_level != BT_SECURITY_HIGH &&
 				!(conn->auth_type & 0x01))
 		return 0;
@@ -1845,9 +1844,8 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 		goto unlock;
 
 	if (!ev->status) {
-		if (!(test_bit(HCI_CONN_SSP_ENABLED, &conn->flags) &&
-				test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) &&
-				test_bit(HCI_CONN_REAUTH_PEND,	&conn->flags)) {
+		if (!hci_conn_ssp_enabled(conn) &&
+				test_bit(HCI_CONN_REAUTH_PEND, &conn->flags)) {
 			BT_INFO("re-auth of legacy device is not possible.");
 		} else {
 			conn->link_mode |= HCI_LM_AUTH;
@@ -1861,9 +1859,7 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 	clear_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 
 	if (conn->state == BT_CONFIG) {
-		if (!ev->status &&
-				test_bit(HCI_SSP_ENABLED, &hdev->dev_flags) &&
-				test_bit(HCI_CONN_SSP_ENABLED, &conn->flags)) {
+		if (!ev->status && hci_conn_ssp_enabled(conn)) {
 			struct hci_cp_set_conn_encrypt cp;
 			cp.handle  = ev->handle;
 			cp.encrypt = 0x01;