Commit graph

359 commits

Author SHA1 Message Date
Jakub Kicinski
2ffecf1a42 Core WPAN changes:
* Support for active scans
 * Support for answering BEACON_REQ
 * Specific MLME handling for limited devices
 
 WPAN driver changes:
 * ca8210:
   - Flag the devices as limited
   - Remove stray gpiod_unexport() call
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Merge tag 'ieee802154-for-net-next-2023-06-23' of gitolite.kernel.org:pub/scm/linux/kernel/git/wpan/wpan-next

Miquel Raynal says:

====================
Core WPAN changes:
 - Support for active scans
 - Support for answering BEACON_REQ
 - Specific MLME handling for limited devices

WPAN driver changes:
 - ca8210:
   - Flag the devices as limited
   - Remove stray gpiod_unexport() call

* tag 'ieee802154-for-net-next-2023-06-23' of gitolite.kernel.org:pub/scm/linux/kernel/git/wpan/wpan-next:
  ieee802154: ca8210: Remove stray gpiod_unexport() call
  ieee802154: ca8210: Flag the driver as being limited
  net: ieee802154: Handle limited devices with only datagram support
  mac802154: Handle received BEACON_REQ
  ieee802154: Add support for allowing to answer BEACON_REQ
  mac802154: Handle active scanning
  ieee802154: Add support for user active scan requests
====================

Link: https://lore.kernel.org/r/20230623195506.40b87b5f@xps-13
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-06-24 15:41:46 -07:00
David S. Miller
8340eef98d Merge tag 'ieee802154-for-net-2023-06-19' of git://git.kernel.org/pub/scm/linux/kernel/git/wpan/wpan
Stefan Schmidt says:

====================
An update from ieee802154 for your *net* tree:

Two small fixes and MAINTAINERS update this time.

Azeem Shaikh ensured consistent use of strscpy through the tree and fixed
the usage in our trace.h.

Chen Aotian fixed a potential memory leak in the hwsim simulator for
ieee802154.

Miquel Raynal updated the MAINATINERS file with the new team git tree
locations and patchwork URLs.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2023-06-20 09:32:33 +01:00
Azeem Shaikh
cd91250306 ieee802154: Replace strlcpy with strscpy
strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().

Direct replacement is safe here since the return values
from the helper macros are ignored by the callers.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230613003326.3538391-1-azeemshaikh38@gmail.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-06-16 22:14:24 +02:00
Miquel Raynal
5c68005083 Linux 6.4-rc4
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Merge tag 'v6.4-rc4' into wpan-next/staging

Linux 6.4-rc4
2023-06-06 10:42:42 +02:00
Joel Fernandes (Google)
eb56a4cbc3 mac802154: Rename kfree_rcu() to kvfree_rcu_mightsleep()
The k[v]free_rcu() macro's single-argument form is deprecated.
Therefore switch to the new k[v]free_rcu_mightsleep() variant. The goal
is to avoid accidental use of the single-argument forms, which can
introduce functionality bugs in atomic contexts and latency bugs in
non-atomic contexts.

The callers are holding a mutex so the context allows blocking. Hence
using the API with a single argument will be fine, but use its new name.

There is no functionality change with this patch.

Fixes: 57588c7117 ("mac802154: Handle passive scanning")
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
2023-04-05 13:48:04 +00:00
Miquel Raynal
d021d218f6 mac802154: Handle received BEACON_REQ
When performing an active scan, devices emit BEACON_REQ which
must be answered by other PANs receiving the request, unless they are
already passively sending beacons.

Answering a beacon request becomes a duty when the user tells us to send
beacons and the request provides an interval of 15.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230310145346.1397068-5-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-03-23 21:51:30 +01:00
Miquel Raynal
e2c3e6f53a mac802154: Handle active scanning
Active scan support is based on the current passive scan support,
cheered up with beacon requests sent after every channel change.

Co-developed-by: David Girault <david.girault@qorvo.com>
Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230310145346.1397068-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-03-23 21:51:13 +01:00
Jakub Kicinski
871489dd01 Merge tag 'ieee802154-for-net-next-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next
Stefan Schmidt says:

====================
pull-request: ieee802154-next 2023-02-20

Miquel Raynal build upon his earlier work and introduced two new
features into the ieee802154 stack. Beaconing to announce existing
PAN's and passive scanning to discover the beacons and associated
PAN's. The matching changes to the userspace configuration tool
have been posted as well and will be released together with the
kernel release.

Arnd Bergmann and Dmitry Torokhov worked on converting the
at86rf230 and cc2520 drivers away from the unused platform_data
usage and towards the new gpiod API. (I had to add a revert as
Dmitry found a regression on an already pushed tree on my side).

Changes since v1 (pull request 2023-02-02)
- Netlink API extack and NLA_POLICY* usage as suggested by Jakub
- Removed always true condition found by kernel test robot
- Simplify device removal with running background job for scanning
- Fix problems with beacon sending in some cases by using the MLME
  tx path

* tag 'ieee802154-for-net-next-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next:
  ieee802154: Drop device trackers
  mac802154: Fix an always true condition
  mac802154: Send beacons using the MLME Tx path
  ieee802154: Change error code on monitor scan netlink request
  ieee802154: Convert scan error messages to extack
  ieee802154: Use netlink policies when relevant on scan parameters
  ieee802154: at86rf230: switch to using gpiod API
  ieee802154: at86rf230: drop support for platform data
  Revert "at86rf230: convert to gpio descriptors"
  cc2520: move to gpio descriptors
  mac802154: Avoid superfluous endianness handling
  at86rf230: convert to gpio descriptors
  mac802154: Handle basic beaconing
  ieee802154: Add support for user beaconing requests
  mac802154: Handle passive scanning
  mac802154: Add MLME Tx locked helpers
  mac802154: Prepare forcing specific symbol duration
  ieee802154: Introduce a helper to validate a channel
  ieee802154: Define a beacon frame header
  ieee802154: Add support for user scanning requests
====================

Link: https://lore.kernel.org/r/20230220213749.386451-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-02-20 16:40:52 -08:00
Miquel Raynal
61d7dddf46 mac802154: Fix an always true condition
At this stage we simply do not care about the delayed work value,
because active scan is not yet supported, so we can blindly queue
another work once a beacon has been sent.

It fixes a smatch warning:
    mac802154_beacon_worker() warn: always true condition
    '(local->beacon_interval >= 0) => (0-u32max >= 0)'

Fixes: 3accf47627 ("mac802154: Handle basic beaconing")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230214135035.1202471-6-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-02-18 16:47:26 +01:00
Miquel Raynal
1375e3ba9d mac802154: Send beacons using the MLME Tx path
Using ieee802154_subif_start_xmit() to bypass the net queue when
sending beacons is broken because it does not acquire the
HARD_TX_LOCK(), hence not preventing datagram buffers to be smashed by
beacons upon contention situation. Using the mlme_tx helper is not the
best fit either but at least it is not buggy and has little-to-no
performance hit. More details are given in the comment explaining this
choice in the code.

Fixes: 3accf47627 ("mac802154: Handle basic beaconing")
Reported-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230214135035.1202471-5-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-02-18 16:44:53 +01:00
Miquel Raynal
8338304c27 mac802154: Avoid superfluous endianness handling
When compiling scan.c with C=1, Sparse complains with:

   sparse:     expected unsigned short [usertype] val
   sparse:     got restricted __le16 [usertype] pan_id
   sparse: sparse: cast from restricted __le16

   sparse:     expected unsigned long long [usertype] val
   sparse:     got restricted __le64 [usertype] extended_addr
   sparse: sparse: cast from restricted __le64

The tool is right, both pan_id and extended_addr already are rightfully
defined as being __le16 and __le64 on both sides of the operations and
do not require extra endianness handling.

Fixes: 3accf47627 ("mac802154: Handle basic beaconing")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230130154306.114265-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-01-30 17:16:28 +01:00
Miquel Raynal
3accf47627 mac802154: Handle basic beaconing
Implement the core hooks in order to provide the softMAC layer support
for sending beacons. Coordinators may be requested to send beacons in a
beacon enabled PAN in order for the other devices around to self
discover the available PANs automatically.

Changing the channels is prohibited while a beacon operation is
ongoing.

The implementation uses a workqueue triggered at a certain interval
depending on the symbol duration for the current channel and the
interval order provided.

Sending beacons in response to a BEACON_REQ frame (ie. answering active
scans) is not yet supported.

This initial patchset has no security support (llsec).

Co-developed-by: David Girault <david.girault@qorvo.com>
Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230125102923.135465-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-01-28 13:55:10 +01:00
Miquel Raynal
57588c7117 mac802154: Handle passive scanning
Implement the core hooks in order to provide the softMAC layer support
for passive scans. Scans are requested by the user and can be aborted.

Changing channels manually is prohibited during scans.

The implementation uses a workqueue triggered at a certain interval
depending on the symbol duration for the current channel and the
duration order provided. More advanced drivers with internal scheduling
capabilities might require additional care but there is none mainline
yet.

Received beacons during a passive scan are processed in a work queue and
their result forwarded to the upper layer.

Active scanning is not supported yet.

Co-developed-by: David Girault <david.girault@qorvo.com>
Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230103165644.432209-7-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-01-03 19:48:43 +01:00
Miquel Raynal
dd18096256 mac802154: Add MLME Tx locked helpers
These have the exact same behavior as before, except they expect the
rtnl to be already taken (and will complain otherwise). This allows
performing MLME transmissions from different contexts.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230103165644.432209-6-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-01-03 19:45:44 +01:00
Miquel Raynal
5755cd4d94 mac802154: Prepare forcing specific symbol duration
The scan logic will bypass the whole ->set_channel() logic from the top
by calling the driver hook to just switch between channels when
required.

We can no longer rely on the "current" page/channel settings to set the
right symbol duration. Let's add these as new parameters to allow
providing the page/channel couple that we want.

There is no functional change.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230103165644.432209-5-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2023-01-03 19:41:16 +01:00
Miquel Raynal
71a06f1034 mac802154: Fix possible double free upon parsing error
Commit 4d1c7d8703 ("mac802154: Move an skb free within the rx path")
tried to simplify error handling within the receive path by moving the
kfree_skb() call at the very end of the top-level function but missed
one kfree_skb() called upon frame parsing error. Prevent this possible
double free from happening.

Fixes: 4d1c7d8703 ("mac802154: Move an skb free within the rx path")
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20221216235742.646134-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-12-19 11:38:12 +01:00
Jakub Kicinski
837e8ac871 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
No conflicts.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-12-08 18:19:59 -08:00
Jakub Kicinski
cfbf877a33 Merge tag 'ieee802154-for-net-next-2022-12-05' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next
Stefan Schmidt says:

====================
ieee802154-next 2022-12-05

Miquel continued his work towards full scanning support. For this,
we now allow the creation of dedicated coordinator interfaces
to allow a PAN coordinator to serve in the network and set
the needed address filters with the hardware.

On top of this we have the first part to allow scanning for available
15.4 networks. A new netlink scan group, within the existing nl802154
API, was added.

In addition Miquel fixed two issues that have been introduced in the former
patches to free an skb correctly and clarifying an expression in the stack.

From David Girault we got tracing support when registering new PANs.

* tag 'ieee802154-for-net-next-2022-12-05' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next:
  mac802154: Trace the registration of new PANs
  ieee802154: Advertize coordinators discovery
  mac802154: Allow the creation of coordinator interfaces
  mac802154: Clarify an expression
  mac802154: Move an skb free within the rx path
====================

Link: https://lore.kernel.org/r/20221205131909.1871790-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-12-07 17:33:26 -08:00
Wei Yongjun
b3d72d3135 mac802154: fix missing INIT_LIST_HEAD in ieee802154_if_add()
Kernel fault injection test reports null-ptr-deref as follows:

BUG: kernel NULL pointer dereference, address: 0000000000000008
RIP: 0010:cfg802154_netdev_notifier_call+0x120/0x310 include/linux/list.h:114
Call Trace:
 <TASK>
 raw_notifier_call_chain+0x6d/0xa0 kernel/notifier.c:87
 call_netdevice_notifiers_info+0x6e/0xc0 net/core/dev.c:1944
 unregister_netdevice_many_notify+0x60d/0xcb0 net/core/dev.c:1982
 unregister_netdevice_queue+0x154/0x1a0 net/core/dev.c:10879
 register_netdevice+0x9a8/0xb90 net/core/dev.c:10083
 ieee802154_if_add+0x6ed/0x7e0 net/mac802154/iface.c:659
 ieee802154_register_hw+0x29c/0x330 net/mac802154/main.c:229
 mcr20a_probe+0xaaa/0xcb1 drivers/net/ieee802154/mcr20a.c:1316

ieee802154_if_add() allocates wpan_dev as netdev's private data, but not
init the list in struct wpan_dev. cfg802154_netdev_notifier_call() manage
the list when device register/unregister, and may lead to null-ptr-deref.

Use INIT_LIST_HEAD() on it to initialize it correctly.

Fixes: fcf39e6e88 ("ieee802154: add wpan_dev_list")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Alexander Aring <aahringo@redhat.com>

Link: https://lore.kernel.org/r/20221130091705.1831140-1-weiyongjun@huaweicloud.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-12-05 09:53:08 +01:00
David Girault
e29e3c7ce6 mac802154: Trace the registration of new PANs
Add an internal trace when valid beacons are received.

Signed-off-by: David Girault <david.girault@qorvo.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221129135535.532513-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-11-29 15:34:32 +01:00
Miquel Raynal
2622e785f7 mac802154: Allow the creation of coordinator interfaces
As a first strep in introducing proper PAN management and association,
we need to be able to create coordinator interfaces which might act as
coordinator or PAN coordinator.

Hence, let's add the minimum support to allow the creation of these
interfaces.

Even though the necessary logic to handle several interfaces on the same
device is added to make this future move easier, in practice only
several interfaces of type MONITOR are allowed at the same time. The
other combinations are not allowed (interface creation is possible but
only one can be opened at a time) because, with a single PHY featuring a
single set of address filters, we cannot afford handling two distinct
interfaces (with different address filters or filtering requirements):
* Having 2 NODEs, 2 COORDs or 1 NODE + 1 COORD
  -> cannot work because the address filters would be different
* Having 1 MONITOR + either 1 NODE or 1 COORD
  -> cannot work because the filtering levels are incompatible

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221026093502.602734-4-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-11-01 11:23:38 +01:00
Miquel Raynal
eb30a7a5c8 mac802154: Clarify an expression
While going through the whole interface opening logic in my head I was
consistently bothered by the condition checking whether there was only
one interface of type NODE/COORD opened at the same time. What actually
bothered me was the fact that in one case we would use the wpan_dev
pointer directly while in the other case we would use the sdata pointer,
making it harder to differentiate both. In practice the condition should
be straightforward to read. IMHO dropping the wpan_dev indirection
allows to clarify the check.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221026093502.602734-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-11-01 11:23:28 +01:00
Miquel Raynal
4d1c7d8703 mac802154: Move an skb free within the rx path
It may appear clearer to free the skb at the end of the path rather than
in the middle, within a helper.

Move kfree_skb() from the end of __ieee802154_rx_handle_packet() to
right after it in the calling function ieee802154_rx(). Doing so implies
reworking a little bit the exit path.

Suggested-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221026093502.602734-2-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-11-01 11:22:54 +01:00
Jakub Kicinski
31f1aa4f74 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
  2871edb32f ("can: kvaser_usb: Fix possible completions during init_completion")
  abb8670938 ("can: kvaser_usb_leaf: Ignore stale bus-off after start")
  8d21f5927a ("can: kvaser_usb_leaf: Fix improved state not being reported")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-10-27 16:56:36 -07:00
Jakub Kicinski
c206394b78 Merge tag 'ieee802154-for-net-next-2022-10-26' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next
Re-pull from Stefan to fix the warnings.

Stefan Schmidt says:

====================
pull-request v2: ieee802154-next 2022-10-26

* tag 'ieee802154-for-net-next-2022-10-26' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next:
  net: mac802154: Fixup function parameter name in docs
====================

Link: https://lore.kernel.org/r/20221026075638.578840-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-10-26 18:14:33 -07:00
David S. Miller
34e0b94520 Merge tag 'ieee802154-for-net-next-2022-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next
Stefan Schmidt says:

====================

==
One of the biggest cycles for ieee802154 in a long time. We are landing the
first pieces of a big enhancements in managing PAN's. We might have another pull
request ready for this cycle later on, but I want to get this one out first.

Miquel Raynal added support for sending frames synchronously as a dependency
to handle MLME commands. Also introducing more filtering levels to match with
the needs of a device when scanning or operating as a pan coordinator.
To support development and testing the hwsim driver for ieee802154 was also
enhanced for the new filtering levels and to update the PIB attributes.

Alexander Aring fixed quite a few bugs spotted during reviewing changes. He
also added support for TRAC in the atusb driver to have better failure
handling if the firmware provides the needed information.

Jilin Yuan fixed a comment with a repeated word in it.
==================

Signed-off-by: David S. Miller <davem@davemloft.net>
2022-10-26 15:24:36 +01:00
Stefan Schmidt
982e2b7329 net: mac802154: Fixup function parameter name in docs
The function parameter name was wrong in kdocs.

net/mac802154/util.c:27: warning: Function parameter or member 'hw' not described in 'ieee802154_wake_queue'
net/mac802154/util.c:27: warning: Excess function parameter 'local' description in 'ieee802154_wake_queue'
net/mac802154/util.c:53: warning: Function parameter or member 'hw' not described in 'ieee802154_stop_queue'
net/mac802154/util.c:53: warning: Excess function parameter 'local' description in 'ieee802154_stop_queue'

Fixing name and description.

Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-26 09:40:34 +02:00
Miquel Raynal
5a5c4e06fd mac802154: Fix LQI recording
Back in 2014, the LQI was saved in the skb control buffer (skb->cb, or
mac_cb(skb)) without any actual reset of this area prior to its use.

As part of a useful rework of the use of this region, 32edc40ae6
("ieee802154: change _cb handling slightly") introduced mac_cb_init() to
basically memset the cb field to 0. In particular, this new function got
called at the beginning of mac802154_parse_frame_start(), right before
the location where the buffer got actually filled.

What went through unnoticed however, is the fact that the very first
helper called by device drivers in the receive path already used this
area to save the LQI value for later extraction. Resetting the cb field
"so late" led to systematically zeroing the LQI.

If we consider the reset of the cb field needed, we can make it as soon
as we get an skb from a device driver, right before storing the LQI,
as is the very first time we need to write something there.

Cc: stable@vger.kernel.org
Fixes: 32edc40ae6 ("ieee802154: change _cb handling slightly")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221020142535.1038885-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-24 11:07:39 +02:00
Miquel Raynal
4161634bce mac802154: Ensure proper scan-level filtering
We now have a fine grained filtering information so let's ensure proper
filtering in scan mode, which means that only beacons are processed.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221019134423.877169-4-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-24 09:34:15 +02:00
Miquel Raynal
3a22550ab5 net: mac802154: Avoid displaying misleading debug information
With DEBUG defined, any frame received will see its MHR fields (fc and
addresses, mainly) being printed in the kernel log buffer,
unconditionally. In most cases this is fine, but in some specific cases
(like Acknowledgment frames, where both the source and destination
addressing fields are omitted), it displays garbage which is
misleading.

Only print the addressing fields when they are present, which clarifies
the logs.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220905202724.1322046-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-12 13:04:51 +02:00
Miquel Raynal
0218277df5 mac802154: Avoid delivering frames received in a non satisfying filtering mode
We must avoid the situation where one interface disables address
filtering and AACK on the PHY while another interface expects to run
with AACK and address filtering enabled. Just ignore the frames on the
concerned interface if this happens.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221007085310.503366-8-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-12 12:57:26 +02:00
Miquel Raynal
a4b5b4c56d mac802154: Drop IEEE802154_HW_RX_DROP_BAD_CKSUM
This IEEE802154_HW_RX_DROP_BAD_CKSUM flag was only used by hwsim to
reflect the fact that it would not validate the checksum (FCS). So this
was only useful while the only filtering level hwsim was capable of was
"NONE". Now that the driver has been improved we no longer need this
flag.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221007085310.503366-7-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-12 12:57:19 +02:00
Alexander Aring
ac8037c35b mac802154: set filter at drv_start()
The current filtering level is set on the first interface up on a wpan
phy. If we support scan functionality we need to change the filtering
level on the fly on an operational phy and switching back again.

This patch will move the receive mode parameter e.g. address filter and
promiscuous mode to the drv_start() functionality to allow changing the
receive mode on an operational phy not on first ifup only. In future this
should be handled on driver layer because each hardware has it's own way
to enter a specific filtering level. However this should offer to switch
to mode IEEE802154_FILTERING_NONE and back to
IEEE802154_FILTERING_4_FRAME_FIELDS.

Only IEEE802154_FILTERING_4_FRAME_FIELDS and IEEE802154_FILTERING_NONE
are somewhat supported by current hardware. All other filtering levels
can be supported in future but will end in IEEE802154_FILTERING_NONE as
the receive part can kind of "emulate" those receive paths by doing
additional filtering routines.

There are in total three filtering levels in the code:
- the per-interface default level (should not be changed)
- the required per-interface level (mac commands may play with it)
- the actual per-PHY (hw) level that is currently in use

Signed-off-by: Alexander Aring <aahringo@redhat.com>
[<miquel.raynal@bootlin.com: Add the third filtering variable]
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20221007085310.503366-4-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-12 12:56:58 +02:00
Alexander Aring
e9d8d9c408 mac802154: move receive parameters above start
This patch moves all receive parameters above the drv_start()
functionality to make it accessibile in the drv_start() function.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20221007085310.503366-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-10-12 12:56:52 +02:00
Miquel Raynal
f0da47118c net: mac802154: Fix a condition in the receive path
Upon reception, a packet must be categorized, either it's destination is
the host, or it is another host. A packet with no destination addressing
fields may be valid in two situations:
- the packet has no source field: only ACKs are built like that, we
  consider the host as the destination.
- the packet has a valid source field: it is directed to the PAN
  coordinator, as for know we don't have this information we consider we
  are not the PAN coordinator.

There was likely a copy/paste error made during a previous cleanup
because the if clause is now containing exactly the same condition as in
the switch case, which can never be true. In the past the destination
address was used in the switch and the source address was used in the
if, which matches what the spec says.

Cc: stable@vger.kernel.org
Fixes: ae531b9475 ("ieee802154: use ieee802154_addr instead of *_sa variants")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220826142954.254853-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-08-29 11:10:22 +02:00
Miquel Raynal
fbdaa5ba6b net: mac802154: Fix a Tx warning check
The purpose of the netif_is_down() helper was to ensure that the network
interface used was still up when performing the transmission. What it
actually did was to check if _all_ interfaces were up. This was not
noticed at that time because I did not use interfaces at all before
discussing with Alexander Aring about how to handle coordinators
properly.

Drop the helper and call netif_running() on the right sub interface
object directly.

Fixes: 4f79018413 ("net: mac802154: Add a warning in the slow path")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220617192914.1275611-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-27 10:57:32 +02:00
Alexander Aring
6c1c78d018 mac802154: fix atomic_dec_and_test checks
We need to call wake_up() when hold_txs reaches zero. The semantic of
atomic_dec_and_test() is that it returns true when it's zero.

Fixes: f0feb34904 ("net: mac802154: Introduce a tx queue flushing mechanism")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220613043735.1039895-3-aahringo@redhat.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-14 10:23:51 +02:00
Alexander Aring
2ec2f6bed4 mac802154: util: fix release queue handling
The semantic of atomic_dec_and_test() is to return true if zero is
reached and we need call ieee802154_wake_queue() when zero is reached.

Fixes: 20a19d1df3 ("net: mac802154: Bring the ability to hold the transmit queue")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220613043735.1039895-2-aahringo@redhat.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-14 10:23:00 +02:00
Miquel Raynal
4f79018413 net: mac802154: Add a warning in the slow path
In order to be able to detect possible conflicts between the net
interface core and the ieee802154 core, let's add a warning in the slow
path: we want to be sure that whenever we start an asynchronous MLME
transmission (which can be fully asynchronous) the net core somehow
agrees that this transmission is possible, ie. the device was not
stopped. Warning in this case would allow us to track down more easily
possible issues with the MLME logic if we ever get reports.

Unlike in the hot path, such a situation cannot be handled.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-12-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:41 +02:00
Miquel Raynal
2b13db13af net: mac802154: Add a warning in the hot path
We should never start a transmission after the queue has been stopped.

But because it might work we don't kill the function here but rather
warn loudly the user that something is wrong.

Set a flag when the queue should remain stopped. Reset this flag when
the queue actually gets restarded. Just check this value to know if a
transmission is legitimate, warn if it is not.

Turn the flags variable into an unsigned long to allow the use of atomic
helpers on it.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-11-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:41 +02:00
Miquel Raynal
ddd9ee7cda net: mac802154: Introduce a synchronous API for MLME commands
This is the slow path, we need to wait for each command to be processed
before continuing so let's introduce an helper which does the
transmission and blocks until it gets notified of its asynchronous
completion. This helper is going to be used when introducing scan
support.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-10-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
f0feb34904 net: mac802154: Introduce a tx queue flushing mechanism
Right now we are able to stop a queue but we have no indication if a
transmission is ongoing or not.

Thanks to recent additions, we can track the number of ongoing
transmissions so we know if the last transmission is over. Adding on top
of it an internal wait queue also allows to be woken up asynchronously
when this happens. If, beforehands, we marked the queue to be held and
stopped it, we end up flushing and stopping the tx queue.

Thanks to this feature, we will soon be able to introduce a synchronous
transmit API.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-9-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
a40612f399 net: mac802154: Introduce a helper to disable the queue
Sometimes calling the stop queue helper is not enough because it does
not hold any lock. In order to be safe and avoid racy situations when
trying to (soon) sync the Tx queue, for instance before sending an MLME
frame, let's now introduce an helper which actually hold the necessary
locks when doing so.

Suggested-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-8-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
226730e1aa net: mac802154: Create a hot tx path
Let's rename the current Tx path to show that this is the "hot" Tx
path. We will soon introduce a slower Tx path for MLME commands.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-7-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
20a19d1df3 net: mac802154: Bring the ability to hold the transmit queue
Create a hold_txs atomic variable and increment/decrement it when
relevant, ie. when we want to hold the queue or release it: currently
all the "stopped" situations are suitable, but very soon we will more
extensively use this feature for MLME purposes.

Upon release, the atomic counter is decremented and checked. If it is
back to 0, then the netif queue gets woken up. This makes the whole
process fully transparent, provided that all the users of
ieee802154_wake/stop_queue() now call ieee802154_hold/release_queue()
instead.

In no situation individual drivers should call any of these helpers
manually in order to avoid messing with the counters. There are other
functions more suited for this purpose which have been introduced, such
as the _xmit_complete() and _xmit_error() helpers which will handle all
that for them.

One advantage is that, as no more drivers call the stop/wake helpers
directly, we can safely stop exporting them and only declare the
hold/release ones in a header only accessible to the core.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-6-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
bde000ae45 net: mac802154: Follow the count of ongoing transmissions
In order to create a synchronous API for MLME command purposes, we need
to be able to track the end of the ongoing transmissions. Let's
introduce an atomic variable which is incremented when a transmission
starts and decremented when relevant so that we know at any moment
whether there is an ongoing transmission.

The counter gets decremented in the following situations:
- The operation is asynchronous and there was a failure during the
  offloading process.
- The operation is synchronous and the synchronous operation failed.
- The operation finished, either successfully or not.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-5-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
d08d951a9a net: mac802154: Enhance the error path in the main tx helper
Before adding more logic in the error path, let's move the wake queue
call there, rename the default label and create an additional one.

There is no functional change.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-4-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
983a974b40 net: mac802154: Rename the main tx_work struct
This entry is dedicated to synchronous transmissions done by drivers
without async hook. Make this clearer that this is not a work that any
driver can use by at least prefixing it with "sync_". While at it, let's
enhance the comment explaining why we choose one or the other.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
be8c6d86d5 net: mac802154: Rename the synchronous xmit worker
There are currently two driver hooks: one is synchronous, the other is
not. We cannot rely on driver implementations to provide a synchronous
API (which is related to the bus medium more than a wish to have a
synchronized implementation) so we are going to introduce a sync API
above any kind of driver transmit function. In order to clarify what
this worker is for (synchronous driver implementation), let's rename it
so that people don't get bothered by the fact that their driver does not
make use of the "xmit worker" which is a too generic name.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-2-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-06-10 09:48:40 +02:00
Miquel Raynal
1229df4b31 net: mac802154: Fix symbol durations
There are two major issues in the logic calculating the symbol durations
based on the page/channel:
- The page number is used in place of the channel value.
- The BIT() macro is missing because we want to check the channel
  value against a bitmask.

Fix these two errors and apologize loudly for this mistake.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220428164140.251965-1-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
2022-04-30 20:29:47 +02:00