Bluetooth: Introduce a flag to track who really initiates authentication

Even though our side requests authentication, the original action that
caused it may be remotely triggered, such as an incoming L2CAP or RFCOMM
connect request. To track this information introduce a new hci_conn flag
called HCI_CONN_AUTH_INITIATOR.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -547,6 +547,7 @@ enum {
 	HCI_CONN_SECURE,
 	HCI_CONN_FIPS,
 	HCI_CONN_STK_ENCRYPT,
+	HCI_CONN_AUTH_INITIATOR,
 };
 
 static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)

net/bluetooth/hci_conn.c

@@ -1027,6 +1027,9 @@ auth:
 	if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 		return 0;
 
+	if (initiator)
+		set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
+
 	if (!hci_conn_auth(conn, sec_level, auth_type))
 		return 0;
 

net/bluetooth/hci_event.c

@@ -1645,6 +1645,8 @@ static void hci_cs_remote_name_req(struct hci_dev *hdev, __u8 status)
 	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 		struct hci_cp_auth_requested auth_cp;
 
+		set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
+
 		auth_cp.handle = __cpu_to_le16(conn->handle);
 		hci_send_cmd(hdev, HCI_OP_AUTH_REQUESTED,
 			     sizeof(auth_cp), &auth_cp);
@@ -2387,6 +2389,9 @@ check_auth:
 
 	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 		struct hci_cp_auth_requested cp;
+
+		set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
+
 		cp.handle = __cpu_to_le16(conn->handle);
 		hci_send_cmd(hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
 	}