As part of the work to remove struct sock from l2cap_core.c and make it
more generic we remove in this commit the direct access to sk->sk_sndtimeo
member. This objective of this change is purely remove sk usage from
l2cap_core.c

Now we have a new l2cap ops to get the current value of sk->sndtimeo. A
l2cap_chan_no_get_sndtimeo was added for users of L2CAP that doesn't need
to set a timeout.
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

l2cap_state_change_and_error() introduces the ability to update a
l2cap_user with changes in channel's state and error code with just one
call. The main reason for this is to avoid race conditions between and
setting the state and then the error. Otherwise we would need to release
the lock between both operations.

This is another step of an ongoing work to make l2cap_core.c totally
independent from l2cap's struct sock.
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Instead of creating an new function pointer to report errors we are just
reusing state_change for that and there is a simple reason for this, one
place in the l2cap_core.c code needs, in a locked sk, set both the sk_state
and sk_err. If we create two different functions for this we would need to
release the lock between the two operation putting the socket in non
desired state.

The change is transparent to the l2cap_core.c code, user that only needs
to set the state won't need any modification.

This is another step of an ongoing work to make l2cap_core.c totally
independent from l2cap's struct sock.
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

When the discoverable timeout triggers and limited discoverable mode
was used, then the class of device needs to be updated to remove
the limited discoverable bit.

To keep the class of device logic in a central place, expose a new
function mgmt_discoverable_timeout that can be called from the
timeout callback. In case the class of device value needs updating,
it will add the HCI command to the transaction.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The eir_get_length() function is only used from hci_event.c and so
instead of having a public function move it to the location where
it is used.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The eir_append_data() function is only used from mgmt.c and so
instead of having a public function move it to the location where
it is used.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The return value of mgmt_new_link_key() function is not used
and so just change it to return void.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The limited discoverable mode should be used when a device is only
discoverable for a certain amount of time and after that it returns
back into being non-discoverable.

This adds another option to the set discoverable management command
to clearly distinguish limited discoverable from general discoverable
mode.

While the general discoverable mode can be set with a specific
timeout or as permanent setting, the limited discoverable mode
requires a timeout. The timeout is flexible and the kernel will
not enforce any specific limitations. That GAP part of this is
required by userspace to enforce according to the Bluetooth core
specification.

Devices in limited discoverable mode can still be found by the
general discovery procedure. It is mandatory that a device sets
both GIAC and LIAC when entering limited discoverable mode.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

When only the discoverable timeout gets updated, just cancel the current
timeout, store the new timeout value. If the new timeout is valid, then
arm the discoverable timeout again.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The discoverable timeout is currently armed from hci_event.c and causes
some side effects when using HCI commands instead of the management
interface. To make this clear, only arm the discoverable timeout from
the management command complete handler.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

When the discoverable mode gets changed, ensure that the class of
device value has the correct limited discoverable bit value set.

Since the class of device HCI command will only be send to the
controller when the value changes, it is safe to just always
trigger the update.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The return value of mgmt_write_scan_failed() function is not used
and so just change it to return void.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The return value of mgmt_connectable() function is not used
and so just change it to return void.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The return value of mgmt_discoverable() function is not used
and so just change it to return void.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

Add a new flag that can be set when in limited discoverable mode. This
flag will cause the limited discoverable bit in the class of device
value to bet set.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

Magically updating the advertising data when some random command enables
advertising in the controller is not really a good idea. It also caused
a bit of complicated code with the exported hci_udpate_ad function that
is shared from many places.

This patch consolidates the advertising data update into the management
core. It also makes sure that when powering on with LE enabled or later
on enabling LE the controller has a good default for advertising data.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

When the discoverable timeout triggers and it is time to turn inquiry
scan back off, use the HCI request framework to do it.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

There is a minor coding style violation and so just fix it. No actual
logic has changed.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

Read the current IAC LAP values when initializing the controller. The
values are not used, but it is good to have them in the trace files
for debugging purposes.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>

When initializing a controller make sure to read out the number of
supported IAC and store its result. This value is needed to determine
if limited discoverable for BR/EDR can be configured or not.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>

The scan window parameter for connection establishment and passive
scanning needs to be smaller or equal than the scan interval.

Instead of waiting for a controller to reject these values later on,
just reject them right away.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

If a socket was bound to an address type other than BR/EDR (such as LE)
we should reject trying to connect it to a BR/EDR address. The same
applies for binding to BR/EDR and trying to connect to non-BR/EDR.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

We need to verify that the bdaddr type passed to connect() and bind() is
within the set of valid values. If it is not we need to cleanly fail
with EINVAL.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch converts Set Discoverable to use an asynchronous request
along with its own completion callback. This is necessary for splitting
raw HCI socket use cases from mgmt, as well as for enabling the hooking
up of Advertising parameters together with the HCI_DISCOVERABLE flag
(coming in later patches).
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Now that the connectable setting is also applicable for the LE side it's
possible that the HCI_CONNECTABLE flag is already set when changing the
BR/EDR setting from false to true while the controller is powered. In
this situation we need to update the BR/EDR scan mode to reflect the
setting. Additionally, since HCI_CONNECTABLE also applies to LE we must
not clear the HCI_CONNECTABLE flag when disabling bredr.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The set_bredr_scan() function will soon be needed by the set_bredr()
function, so move it to a new location to avoid having to add a forward
declaration.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch updates the Set Connectable Management command to also update
the LE advertising type to either connectable or non-connectable
advertising. An extra helper function is needed for getting the right
advertising type since we can not only rely on the HCI_CONNECTABLE flag
but must also check for a pending Set Connectable command (in which case
the flag does not yet have its final value).
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

We need to ensure that the advertising data is up-to-date whenever
advertising is enabled, but when disabling advertising we do not need to
worry about it (since it will eventually get fixed as soon as
advertising is enabled again). This patch fixes this in the command
complete callback for set_adv_enable.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

These functions will soon be used by set_connectable() so move them to a
location in mgmt.c that doesn't require forward declarations.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

If the HCI commands related to the Set Connectable command fail we will
get a non-zero status in the request completion callback. In such a case
we must respond with the appropriate command status message to user space.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch moves the responsibility of setting/clearing the
HCI_CONNECTABLE flag to the request completion callback of the Set
Connectable command. This will allow us to cleanly add support for LE
Advertising hooks in later patches.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch moves all the decisions of which HCI commands to send (or not
to send) to the code between hci_req_init() and hci_req_run() this
allows us to further extend the request with further commands but still
keep the same logic of handling whether to return a direct mgmt response
in the case that no HCI commands were sent.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Clearing the BT_SK_SUSPEND socket flag from the L2CAP core is causing
a dependency on the socket. So intead of doing that, use a channel
callback into the socket handling to resume.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The L2CAP core should not look into the socket flags to figure out the
setting of defer setup. So introduce a L2CAP channel flag that mirrors
the socket flag.

Since the defer setup option is only set in one place this becomes a
really easy thing to do.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The exposed socket information do not contain source or destination
addresses. So adjust the header accordingly.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

There have been a lot of changes in the core Bluetooth handling
lately. So it is a good idea to increase the module version.

The module version is not used anywhere, but it makes debugging
a little bit simpler if versions can be distinguished.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

The L2CAP connectionless channels use SOCK_DGRAM and recvmsg() and need
to receive the remote BD_ADDR and PSM information via msg_name from
the recvmsg() system call.

So in case the L2CAP socket is for connectionless channels, provide
a msg_name callback that can update the data. Also store the remote
BD_ADDR and PSM in the skb so it can be extracted later on.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

This allows to add a per socket msg_name callback that can be used
for updating the msg_name information for recvmsg() system calls.

This feature is used by another patch to support address information
on L2CAP connectionless channels.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

There are few places where it makes sense to use l2cap_pi(sk) directly
instead of assigning it to temporary structure.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

Every socket protocol now stores its own address information. So
just remove the generic src and dst fields since they are no longer
needed.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>