[Bluetooth] Export details about authentication requirements

With the Simple Pairing support, the authentication requirements are
an explicit setting during the bonding process. Track and enforce the
requirements and allow higher layers like L2CAP and RFCOMM to increase
them if needed.

This patch introduces a new IOCTL that allows to query the current
authentication requirements. It is also possible to detect Simple
Pairing support in the kernel this way.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 34 insertions, 4 deletions

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 6f22533e765..0d4b8aeb8e0 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -379,13 +379,21 @@ int hci_conn_auth(struct hci_conn *conn)
 {
 	BT_DBG("conn %p", conn);
 
+	if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0) {
+		if (!(conn->auth_type & 0x01)) {
+			conn->auth_type = HCI_AT_GENERAL_BONDING_MITM;
+			conn->link_mode &= ~HCI_LM_AUTH;
+		}
+	}
+
 	if (conn->link_mode & HCI_LM_AUTH)
 		return 1;
 
 	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 		struct hci_cp_auth_requested cp;
 		cp.handle = cpu_to_le16(conn->handle);
-		hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
+		hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
+							sizeof(cp), &cp);
 	}
 	return 0;
 }
@@ -397,7 +405,7 @@ int hci_conn_encrypt(struct hci_conn *conn)
 	BT_DBG("conn %p", conn);
 
 	if (conn->link_mode & HCI_LM_ENCRYPT)
-		return 1;
+		return hci_conn_auth(conn);
 
 	if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 		return 0;
@@ -406,7 +414,8 @@ int hci_conn_encrypt(struct hci_conn *conn)
 		struct hci_cp_set_conn_encrypt cp;
 		cp.handle  = cpu_to_le16(conn->handle);
 		cp.encrypt = 1;
-		hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), &cp);
+		hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
+							sizeof(cp), &cp);
 	}
 	return 0;
 }
@@ -420,7 +429,8 @@ int hci_conn_change_link_key(struct hci_conn *conn)
 	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 		struct hci_cp_change_conn_link_key cp;
 		cp.handle = cpu_to_le16(conn->handle);
-		hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp);
+		hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
+							sizeof(cp), &cp);
 	}
 	return 0;
 }
@@ -624,3 +634,23 @@ int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 
 	return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 }
+
+int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
+{
+	struct hci_auth_info_req req;
+	struct hci_conn *conn;
+
+	if (copy_from_user(&req, arg, sizeof(req)))
+		return -EFAULT;
+
+	hci_dev_lock_bh(hdev);
+	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
+	if (conn)
+		req.type = conn->auth_type;
+	hci_dev_unlock_bh(hdev);
+
+	if (!conn)
+		return -ENOENT;
+
+	return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
+}