Bluetooth: preparation for new connect procedure

This change “Bluetooth: preparation for new connect procedure” in Linux kernel is authored by Jakub Pawlowski <jpawlowski [at] google.com> on Fri Aug 7 20:22:51 2015 +0200.

Bluetooth: preparation for new connect procedure

Currently, when trying to connect to already paired device that just
rotated its RPA MAC address, old address would be used and connection
would fail. In order to fix that, kernel must scan and receive
advertisement with fresh RPA before connecting.

This patch adds some fields to hci_conn_params, in preparation to new
connect procedure.

explicit_connect will be used to override any current auto_connect action,
and connect to device when ad is received.

HCI_AUTO_CONN_EXPLICIT was added to auto_connect enum. When this value
will be used, explicit connect is the only action, and params can be
removed after successful connection.

HCI_CONN_SCANNING is added to hci_conn flags. When it's set, connect is
scan phase. It gets cleared when advertisement is received, and
HCI_OP_LE_CREATE_CONN is sent.

Signed-off-by: Jakub Pawlowski <jpawlowski@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 158e921.

There are 3 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 include/net/bluetooth/hci_core.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 2a6b091..c8d2b5a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -512,9 +512,11 @@ struct hci_conn_params {
 		HCI_AUTO_CONN_DIRECT,
 		HCI_AUTO_CONN_ALWAYS,
 		HCI_AUTO_CONN_LINK_LOSS,
+		HCI_AUTO_CONN_EXPLICIT,
 	} auto_connect;
 
 	struct hci_conn *conn;
+	bool explicit_connect;
 };
 
 extern struct list_head hci_dev_list;
@@ -639,6 +641,7 @@ enum {
 	HCI_CONN_DROP,
 	HCI_CONN_PARAM_REMOVAL_PEND,
 	HCI_CONN_NEW_LINK_KEY,
+	HCI_CONN_SCANNING,
 };
 
 static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)

The commit for this change in Linux stable tree is 158e921 (patch).

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