linux/include/net/bluetooth
Marcel Holtmann 2950f21acb Bluetooth: Ask upper layers for HCI disconnect reason
Some of the qualification tests demand that in case of failures in L2CAP
the HCI disconnect should indicate a reason why L2CAP fails. This is a
bluntly layer violation since multiple L2CAP connections could be using
the same ACL and thus forcing a disconnect reason is not a good idea.

To comply with the Bluetooth test specification, the disconnect reason
is now stored in the L2CAP connection structure and every time a new
L2CAP channel is added it will set back to its default. So only in the
case where the L2CAP channel with the disconnect reason is really the
last one, it will propagated to the HCI layer.

The HCI layer has been extended with a disconnect indication that allows
it to ask upper layers for a disconnect reason. The upper layer must not
support this callback and in that case it will nicely default to the
existing behavior. If an upper layer like L2CAP can provide a disconnect
reason that one will be used to disconnect the ACL or SCO link.

No modification to the ACL disconnect timeout have been made. So in case
of Linux to Linux connection the initiator will disconnect the ACL link
before the acceptor side can signal the specific disconnect reason. That
is perfectly fine since Linux doesn't make use of this value anyway. The
L2CAP layer has a perfect valid error code for rejecting connection due
to a security violation. It is unclear why the Bluetooth specification
insists on having specific HCI disconnect reason.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27 06:14:43 +01:00
..
bluetooth.h Bluetooth: Add enhanced security model for Simple Pairing 2009-02-27 06:14:25 +01:00
hci_core.h Bluetooth: Ask upper layers for HCI disconnect reason 2009-02-27 06:14:43 +01:00
hci.h Bluetooth: Add SCO fallback for eSCO connection attempts 2009-02-27 06:14:37 +01:00
l2cap.h Bluetooth: Ask upper layers for HCI disconnect reason 2009-02-27 06:14:43 +01:00
rfcomm.h Bluetooth: Pause RFCOMM TX when encryption drops 2009-02-27 06:14:33 +01:00
sco.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00