It was possible for mac80211 to be coerced into an
unexpected flow causing sdata union to become
corrupted. Station pointer was put into
sdata->u.vlan.sta memory location while it was
really master AP's sdata->u.ap.next_beacon. This
led to station entry being later freed as
next_beacon before __sta_info_flush() in
ieee80211_stop_ap() and a subsequent invalid
pointer dereference crash.

The problem was that ieee80211_ptr->use_4addr
wasn't cleared on interface type changes.

This could be reproduced with the following steps:

 # host A and host B have just booted; no
 # wpa_s/hostapd running; all vifs are down
 host A> iw wlan0 set type station
 host A> iw wlan0 set 4addr on
 host A> printf 'interface=wlan0\nssid=4addrcrash\nchannel=1\nwds_sta=1' > /tmp/hconf
 host A> hostapd -B /tmp/conf
 host B> iw wlan0 set 4addr on
 host B> ifconfig wlan0 up
 host B> iw wlan0 connect -w hostAssid
 host A> pkill hostapd
 # host A crashed:

 [  127.928192] BUG: unable to handle kernel NULL pointer dereference at 00000000000006c8
 [  127.929014] IP: [<ffffffff816f4f32>] __sta_info_flush+0xac/0x158
 ...
 [  127.934578]  [<ffffffff8170789e>] ieee80211_stop_ap+0x139/0x26c
 [  127.934578]  [<ffffffff8100498f>] ? dump_trace+0x279/0x28a
 [  127.934578]  [<ffffffff816dc661>] __cfg80211_stop_ap+0x84/0x191
 [  127.934578]  [<ffffffff816dc7ad>] cfg80211_stop_ap+0x3f/0x58
 [  127.934578]  [<ffffffff816c5ad6>] nl80211_stop_ap+0x1b/0x1d
 [  127.934578]  [<ffffffff815e53f8>] genl_family_rcv_msg+0x259/0x2b5

Note: This isn't a revert of f8cdddb8
("cfg80211: check iface combinations only when
iface is running") as far as functionality is
considered because b6a55015 ("cfg80211/mac80211:
move more combination checks to mac80211") moved
the logic somewhere else already.

Fixes: f8cdddb8 ("cfg80211: check iface combinations only when iface is running")
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

There was a possible race between
ieee80211_reconfig() and
ieee80211_delayed_tailroom_dec(). This could
result in inability to transmit data if driver
crashed during roaming or rekeying and subsequent
skbs with insufficient tailroom appeared.

This race was probably never seen in the wild
because a device driver would have to crash AND
recover within 0.5s which is very unlikely.

I was able to prove this race exists after
changing the delay to 10s locally and crashing
ath10k via debugfs immediately after GTK
rekeying. In case of ath10k the counter went below
0. This was harmless but other drivers which
actually require tailroom (e.g. for WEP ICV or
MMIC) could end up with the counter at 0 instead
of >0 and introduce insufficient skb tailroom
failures because mac80211 would not resize skbs
appropriately anymore.

Fixes: 8d1f7ecd ("mac80211: defer tailroom counter manipulation when roaming")
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When we disconnect from the AP, drivers call cfg80211_disconnect().
This doesn't know whether the disconnection was initiated locally
or by the AP though, which can cause problems with the supplicant,
for example with WPS. This issue obviously doesn't show up with any
mac80211 based driver since mac80211 doesn't call this function.

Fix this by requiring drivers to indicate whether the disconnect is
locally generated or not. I've tried to update the drivers, but may
not have gotten the values correct, and some drivers may currently
not be able to report correct values. In case of doubt I left it at
false, which is the current behaviour.

For libertas, make adjustments as indicated by Dan Williams.
Reported-by: Matthieu Mauger <matthieux.mauger@intel.com>
Tested-by: Matthieu Mauger <matthieux.mauger@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When a station does a channel switch, it's not well defined what its TDLS
peers would do. Avoid a situation when the local side marks a potentially
disconnected peer as a TDLS peer.
Keeping peers connected through CSA is doubly problematic with the upcoming
TDLS WIDER-BW feature which allows peers to widen the BSS channel. The
new channel transitioned-to might not be compatible and would require
a re-negotiation anyway.

Make sure to disallow new TDLS link during CSA.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Drivers with fast-xmit (e.g. ath10k) running in
AP_VLAN setups would fail to communicate with
connected 4addr stations.

The reason was when new station associates it
first goes into master AP interface. It is not
until later that a dedicated AP_VLAN is created
for it and the station itself is moved there.
After that Tx directed at the station should use
4addr header. However fast-xmit wasn't
recalculated and 3addr header remained to be used.
This in turn caused the connected 4addr stations
to drop packets coming from the AP until some
other event would cause fast-xmit to recalculate
for that station (which could never come).
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The kernel-doc description for the drv_priv member of
struct ieee80211_txq was missing, leading to errors.
Add a suitable description to fix that.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Use dev_pm_ops instead of the legacy suspend/resume callbacks for the wiphy
class suspend and resume operations.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Use dev_pm_ops instead of the legacy suspend/resume callbacks for the
rfkill class suspend and resume operations.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

My recent change here introduced a possible memory leak if the
driver registers an invalid cipher schemes. This won't really
happen in practice, but fix the leak nonetheless.

Fixes: e3a55b53 ("mac80211: validate cipher scheme PN length better")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

As I was testing with hwsim, I missed that my previous commit to
make LED work depend on activation broke the code because I missed
removing the old trigger struct and some code was still using it,
now erroneously, causing crashes.

Fix this by always using the correct struct.
Reported-by: Felix Fietkau <nbd@openwrt.org>
Tested-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The chandef of the current channel context might be wider (though
compatible). The TDLS link cares only about the channel of the BSS.

In addition make sure to specify the VHT operation IE when VHT is supported
on a non-2.4GHz band, as required by IEEE802.11ac-2013. This is not the
same as HT-operation, to be specified only if the BSS doesn't support HT.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When an IBSS station gets QoS enabled after having been added,
check fast-xmit to make sure the QoS header gets added to the
cache properly and frames can go out with QoS and higher rates.
Reported-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When a vif starts using a reserved channel context (during CSA, for example)
the required chandef was recalculated, however it was never applied.
This could result in using chanctx with narrower width than actually
required. Fix this by calling ieee80211_change_chanctx with the recalculated
chandef. This both changes the chanctx's width and recalcs min_def.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Reviewed-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This was missed in the previous patch, add some documentation
for rate_ctrl_lock to avoid docbook warnings.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The GO_CONCURRENT regulatory definition can be extended to station
interfaces requesting to IR as part of TDLS off-channel operations.
Rename the GO_CONCURRENT flag to IR_CONCURRENT and allow the added
use-case.

Change internal users of GO_CONCURRENT to use the new definition.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Declare that MCS 0-9 are supported for all Rx chains.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Previously, VHT capabilities and supported MCSs where set for all
bands, although VHT is only allowed on 5.2 GHz band. Fix it.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If a P2P GO was allowed on a channel because of the GO concurrent
relaxation, i.e., another station interface was associated to an AP on
the same channel or the same UNII band, and the station interface
disconnected from the AP, allow the following use cases unless the
channel is marked as indoor only and the device is not operating in an
indoor environment:

1. Allow the P2P GO to stay on its current channel. The rationale behind
   this is that if the channel or UNII band were allowed by the AP they
   could still be used to continue the P2P GO operation, and avoid connection
   breakage.
2. Allow another P2P GO to start on the same channel or another channel
   that is in the same UNII band as the previous instantiated P2P GO.
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Currently, a cipher scheme can advertise an arbitrarily long
sequence counter, but mac80211 only supports up to 16 bytes
and the initial value from userspace will be truncated.

Fix two things:
 * don't allow the driver to register anything longer than
   the 16 bytes that mac80211 reserves space for
 * require userspace to specify a starting value with the
   correct length (or none at all)
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For ciphers not supported by mac80211, the function currently
doesn't return any PN data. Fix this by extending the driver's
get_key_seq() a little more to allow moving arbitrary PN data.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Extend the function to read the TKIP IV32/IV16 to read the IV/PN for
all ciphers in order to allow drivers with full hardware crypto to
properly support this.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

No current (and planned, as far as I know) wifi devices support
encapsulation checksum offload, so remove the useless test here.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When LED triggers are compiled in, but not used, mac80211 will still
call them to update the status. This isn't really a problem for the
assoc and radio ones, but the TX/RX (and to a certain extend TPT)
ones can be called very frequently (for every packet.)

In order to avoid that when they're not used, track their activation
and call the corresponding trigger (and in the TPT case, account for
throughput) only when the trigger is actually used by an LED.

Additionally, make those trigger functions inlines since theyre only
used once in the remaining code.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This is just a code cleanup, make the LED trigger names const
as they're not expected to be modified by drivers.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Remove items that can be retrieved through nl80211. This also
removes two items (tx_packets and tx_bytes) where only the VO
counter was exposed since they are split up per AC but in the
debugfs file only the first AC was shown.

Also remove the useless "dev" file - the stations have long
been in a sub-directory of the netdev so there's no need for
that any more.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This counter is unsafe with concurrent TX and is only exposed
through debugfs and ethtool. Instead of trying to fix it just
remove it for now, if it's really needed then it should be
exposed through nl80211 and in a way that drivers that do the
fragmentation in the device could support it as well.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since these counters can only be read through debugfs, there's
very little point in maintaining them all the time. However,
even just making them depend on debugfs is pointless - they're
not normally used. Additionally a number of them aren't even
concurrency safe.

Move them under MAC80211_DEBUG_COUNTERS so they're normally
not even compiled in.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The debugfs statistics macros are pointlessly verbose, so change
that macro to just have a single argument. While at it, remove
the unused counters and rename rx_expand_skb_head2 to the better
rx_expand_skb_head_defrag.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Currently while associated to an AP and sending a (public) action
frame to a different AP on the same channel, the action frame will
be sent like a regular tx frame without going off channel.

When power save is enabled this can cause problems, since the device
can go into power save and miss the response to the action frame
that is sent by the other AP.

Force off-channel transmission to avoid this issue in case
- HW offchannel is used,
- the user didn't forbid transmitting frames off channel
- the frame is not sent to the AP that we are associated with
  (if it is we assume the response would be bufferable)
Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
[reword commit message a bit]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When frames time out in the reordering buffer, it is a
good indication that something went wrong and the driver
may want to know about that to take action or trigger
debug flows.
It is pointless to notify the driver about each frame that
is released. Notify each time the timer fires.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When we receive a BAR, this typically means that our peer
doesn't hear our Block-Acks or that we can't hear its
frames. Either way, it is a good indication that the link
is in a bad condition. This is why it can serve as a probe
to the driver.
Use the event_callback callback for this.
Since more events with the same data will be added in the
feature, the structure that describes the data attached to
the event is called in a generic name: ieee80211_ba_event.

This also means that from now on, the event_callback can't
sleep.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This will allow mac80211 to forbid sleeping from the
event_callback callback.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

HT and VHT override configurations were ignored during association and
applied only when first beacon recived, or not applied at all.

Fix the code to apply HT/VHT overrides during association. This is a bit
tricky since the channel was already configured during authentication
and we don't want to reconfigure it unless there's really a change.
Signed-off-by: Chaya Rachel Ivgi <chaya.rachel.ivgi@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

wpa_supplicant or authsae handles the mesh peering in user
space, but the plink state is still managed in kernel space.
Currently, there is no implementation by wpa_supplicant or
authsae to block the plink state after it is set to ESTAB.

By applying this patch, we can use the "iw mesh0 station set
<MAC address> plink_action block" to block the peer mesh STA.
This is useful for experimenting purposes.
Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This isn't all that relevant for RX right now, but TX can be concurrent
due to multi-queue and the accounting is therefore broken.

Use the standard per-CPU statistics to avoid this.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This isn't necessary any more as the stack will automatically
update the TXQ's trans_start after calling ndo_start_xmit().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The OCB input path already checked that the BSSID is the broadcast
address, so the later check can never fail.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The function really shouldn't be called prepare_for_handlers(),
all it does is check if the frame should be dropped. Rename it
to ieee80211_accept_frame() and clean it up a bit.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

With promisc support gone, only AP and P2P-Device type interfaces
still clear IEEE80211_RX_RA_MATCH. In both cases this isn't really
necessary though, so we can remove that flag and the code.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This support is essentially useless as typically networks are encrypted,
frames will be filtered by hardware, and rate scaling will be done with
the intended recipient in mind. For real monitoring of the network, the
monitor mode support should be used instead.

Removing it removes a lot of corner cases.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>