When the controller is not active or in init/setup phase, do not
try to start or stop background scanning.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When trying to pair a new Bluetooth Low Energy device, then make sure
that the default connections parameters are in place before trying to
establish the first connection to that device. With the connection
parameters structure allocated, the slave preferred values can now
easily be tracked and all future connections will use the correct
values from that start decreasing connection establishment time.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

In some cases it is useful to not overwrite connection parametes and
instead just create default ones if they don't exist. This function
does exactly that. hci_conn_params_add will allow to create new
default connection parameters. hci_conn_params_set will set the
values and also create new parameters if they don't exist.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The controller has a default value for the supervision timeout. Expose
this via debugfs for testing purposes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The controller has a default value for the connection latency. Expose
this via debugfs for testing purposes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

Store the connection latency and supervision timeout default values
with all the other controller defaults. And when needed use them
for new connections.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When devices are added or removed, then make sure that events are send
out to all other clients so that the list of devices can be easily
tracked. This is especially important when external clients are
adding or removing devices within the auto-connection list.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

Since the auto-connection handling has gained offical management
command support, remove the le_auto_conn debugfs entry.

For debugging purposes replace it a simple device_list debugfs
entry that allows listing of the current internal auto-connection
list used for passive scanning.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

This allows adding or removing devices from the background scanning
list the kernel maintains. Device flagged for auto-connection will
be automatically connected if they are found.

The passive scanning required for auto-connection will be started
and stopped on demand.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When the LE connection parameters for connection latency and
supervision timeout are known, then use then. If they are not
know fallback to defaults.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When the slave updates the connection parameters, store also the
connection latency and supervision timeout information in the
internal list of connection parameters for known devices.

Having these values available allowes the auto-connection
procedure to use the correct values from the beginning without
having to request an update on every connection establishment.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When calling hci_conn_params_clear function, it should update the
background scanning properly and not require a separate call to
update it.

For the case when the function is used during unregister of a
controller, an extra safe guard is but in place.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When hci_conn_params_clear is called, it is always followed by a
call to hci_pend_le_conns_clear. So instead of making this explicit
just make sure it is always called. This makes this function similar
on how hci_conn_params_add and hci_conn_params_del work.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The hci_pend_le_conn_* function should be placed before their actual
users. So move them before hci_conn_params_* functions.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The usage of non-resovlable private addresses for passive scanning is
a bad idea. Passive scanning will not send any SCAN_REQ and thus using
your identity address for passive scanning is not a privacy issue.

It is important to use the identity address during passive scanning
since that is the only way devices using direct advertising will be
reported correctly by the controller. This is overlooked detail in
the Bluetooth specification that current controllers are not able
to report direct advertising events for other than their current
address.

When remote peers are using direct advertising and scanning is done
with non-resolvable private address these devices will not be found.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

Bluetooth controllers that are marked for raw-only usage can only be
used with user channel access. Any other operation should be rejected.

This simplifies the whole raw-only support since it now depends on
the fact that the controller is marked with HCI_QUIRK_RAW_DEVICE and
runtime raw access is restricted to user channel operation.

The kernel internal processing of HCI commands and events is designed
around the case that either the kernel has full control over the device
or that the device is driven from userspace. This now makes a clear
distinction between these two possible operation modes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

This patch implements support for the Get Clock Information mgmt
command. This is done by performing one or two HCI_Read_Clock commands
and creating the response from the stored values in the hci_dev and
hci_conn structs.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

This patch adds support for storing the local and piconet clock values
from the HCI_Read_Clock command response to the hci_dev and hci_conn
structs. This will be later used in another patch to implement support
for the Get Clock Info mgmt command.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

By using kzalloc we ensure that there are no struct members, such as the
user_data pointer, left uninitialized.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

This patch increments the management interface revision due to the
changes with the debug key command and other fixes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

When the connection is in master role and it is going to be
disconnected based on the disconnection timeout, then send
the HCI_Read_Clock_Offset command in an attempt to update the
clock offset value in the inquiry cache.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The abstraction of disconnect operation via hci_conn_disconnect is not
needed and it does not add any readability. Handle the difference of
AMP physical channels and BR/EDR/LE connection in the timeout callback.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The hci_amp_disconn function is a local function and there is no
need for a reason parameter. That one can be retrieved from the
hci_conn object easily.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

The smp_conn member of struct hci_conn was simply a pointer to the
l2cap_conn object. Since we already have hcon->l2cap_data that points to
the same thing there's no need to have this second variable. This patch
removes it and changes the single place that was using it to use
hcon->l2cap_data instead.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

The smp_user_confirm_reply() function is called whenever user space
sends a user confirmation reply mgmt command. In case of a misbehaving
user space, or if the SMP session was removed by the time the command
comes it is important that we return an appropriate error and do not try
to access the non-existent SMP context. This patch adds the appropriate
check for the HCI_CONN_LE_SMP_PEND flag before proceeding further.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Now that the SMP context has it's own crypto handle it doesn't need to
lock the hci_dev anymore for most operations. This means that it is safe
to call smp_user_confirm_reply with the lock already held.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Passing the full SMP context instead of just the crypto context lets us
use the crypto handle from the context which in turn removes the need to
lock the hci_dev. Passing the SMP context instead of just the crypto
handle allows a bit more detailed logging which is helpful in
multi-adapter scenarios.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Many places have to be extra careful to not hold the hdev lock when
calling into the SMP code. This is because the SMP crypto functions use
the crypto handle that's part of the hci_dev struct. Giving the SMP
context its own handle helps simplifying the locking logic and removes
the risk for deadlocks.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

The hdev lock must be held before calling into smp_distribute_keys. Also
things such as hci_add_irk() require the lock. This patch fixes the
issue by adding the necessary locking into the smp_cmd_ident_addr_info
function.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

This patch replaces the hard-coded value in hci_bdaddr_is_rpa() helper
by the corresponding macro ADDR_LE_DEV_RANDOM.
Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Since the link_mode member of the hci_conn struct is a bit field and we
already have a flags member as well it makes sense to merge these two
together. This patch moves all used link_mode bits into corresponding
flags. To keep backwards compatibility with user space we still need to
provide a get_link_mode() helper function for the ioctl's that expect a
link_mode style value.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

The ssp_debug_mode debugfs option for developers is no longer
needed. Support for using Secure Simple Pairing (SSP) debug
mode is exposed by the management interface now.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

This patch adds a new valid mode 0x02 for the mgmt_set_debug_keys
command. The 0x02 mode sets the HCI_USE_DEBUG_KEYS flag which makes us
always use debug keys for pairing.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

To pave the way for actively using debug keys for pairing this patch
adds a new HCI_USE_DEBUG_KEYS flag for the purpose. When the flag is set
we issue a HCI_Write_SSP_Debug mode whenever HCI_Write_SSP_Mode(0x01)
has been issued as well as before issuing a HCI_Write_SSP_Mode(0x00)
command.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

We should never allow user space to feed back debug keys to the kernel.
If the user desires to use debug keys require setting the appropriate
debug keys mode and performing a new pairing.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

There's no point in having boolean variables in the hci_conn struct
since it already has a flags member. This patch converts the flush_key
member into a proper flag.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Instead of waiting for a disconnection to occur to remove a debug key
simply never store it in the list to begin with. This means we can also
remove the debug keys check when looking up keys in
hci_link_key_request_evt().
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

We're planning to add a flag to actively use debug keys in addition to
simply just accepting them, which makes the current generically named
DEBUG_KEYS flag a bit confusing. Since the flag in practice affects
whether the kernel keeps debug keys around or not rename it to
HCI_KEEP_DEBUG_KEYS.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

There are two callers of hci_add_link_key(). The first one is the HCI
Link Key Notification event and the second one the mgmt code that
receives a list of link keys from user space. Previously we've had the
hci_add_link_key() function being responsible for also emitting a mgmt
signal but for the latter use case this should not happen. Because of
this a rather awkward new_key paramter has been passed to the function.

This patch moves the mgmt event sending out from the hci_add_link_key()
function, thereby making the code a bit more understandable.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

By returning the added (or updated) key we pave the way for further
refactoring (in subsequent patches) that allows moving the mgmt event
sending out from this function (and thereby removal of the awkward
new_key parameter).
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>