Bluetooth: Refactor connection request handling

The conditions for accepting an incoming connections are already
non-trivial and will become more so once a white list is added. This
patch breaks up the checks for when to reject the request by creating a
helper function for it.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_event.c

@@ -2121,10 +2121,21 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 	hci_conn_check_pending(hdev);
 }
 
+static void hci_reject_conn(struct hci_dev *hdev, bdaddr_t *bdaddr)
+{
+	struct hci_cp_reject_conn_req cp;
+
+	bacpy(&cp.bdaddr, bdaddr);
+	cp.reason = HCI_ERROR_REJ_BAD_ADDR;
+	hci_send_cmd(hdev, HCI_OP_REJECT_CONN_REQ, sizeof(cp), &cp);
+}
+
 static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_conn_request *ev = (void *) skb->data;
 	int mask = hdev->link_mode;
+	struct inquiry_entry *ie;
+	struct hci_conn *conn;
 	__u8 flags = 0;
 
 	BT_DBG("%s bdaddr %pMR type 0x%x", hdev->name, &ev->bdaddr,
@@ -2133,12 +2144,18 @@ static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 	mask |= hci_proto_connect_ind(hdev, &ev->bdaddr, ev->link_type,
 				      &flags);
 
-	if ((mask & HCI_LM_ACCEPT) &&
-	    !hci_bdaddr_list_lookup(&hdev->blacklist, &ev->bdaddr,
+	if (!(mask & HCI_LM_ACCEPT)) {
+		hci_reject_conn(hdev, &ev->bdaddr);
+		return;
+	}
+
+	if (!hci_bdaddr_list_lookup(&hdev->blacklist, &ev->bdaddr,
 				    BDADDR_BREDR)) {
+		hci_reject_conn(hdev, &ev->bdaddr);
+		return;
+	}
+
 	/* Connection accepted */
-		struct inquiry_entry *ie;
-		struct hci_conn *conn;
 
 	hci_dev_lock(hdev);
 
@@ -2173,8 +2190,7 @@ static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		else
 			cp.role = 0x01; /* Remain slave */
 
-			hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp),
-				     &cp);
+		hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
 	} else if (!(flags & HCI_PROTO_DEFER)) {
 		struct hci_cp_accept_sync_conn_req cp;
 		conn->state = BT_CONNECT;
@@ -2188,20 +2204,12 @@ static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		cp.content_format = cpu_to_le16(hdev->voice_setting);
 		cp.retrans_effort = 0xff;
 
-			hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
-				     sizeof(cp), &cp);
+		hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ, sizeof(cp),
+			     &cp);
 	} else {
 		conn->state = BT_CONNECT2;
 		hci_proto_connect_cfm(conn, 0);
 	}
-	} else {
-		/* Connection rejected */
-		struct hci_cp_reject_conn_req cp;
-
-		bacpy(&cp.bdaddr, &ev->bdaddr);
-		cp.reason = HCI_ERROR_REJ_BAD_ADDR;
-		hci_send_cmd(hdev, HCI_OP_REJECT_CONN_REQ, sizeof(cp), &cp);
-	}
 }
 
 static u8 hci_to_mgmt_reason(u8 err)