Commit graph

36 commits

Author SHA1 Message Date
Johannes Berg
c5309ba787 mac80211: tdls: disentangle HT supported conditions
These conditions are rather difficult to follow, for example
because "!sta" only exists to not crash in the case that we
don't have a station pointer (WLAN_TDLS_SETUP_REQUEST) in
which the additional condition (peer supports HT) doesn't
actually matter anyway.

Cleaning this up only duplicates two lines of code but makes
the rest far easier to read, so do that.

As a side effect, smatch stops complaining about the lack of
a sta pointer test after the !sta (since the !sta goes away)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-01-23 11:42:14 +01:00
Johannes Berg
d6f5cc091b mac80211: tdls: remove shadowing variable
There's no need to use another local 'sta' variable as the
original (outer scope) one isn't needed any more and has
become invalid anyway when exiting the RCU read section.

Remove the inner scope one and along with it the useless NULL
initialization.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-01-23 11:37:44 +01:00
Arik Nemtsov
50075892ba mac80211: add TDLS supported channels correctly
The function adding the supported channels IE during a TDLS connection had
several issues:
1. If the entire subband is usable, the function exitted the loop without
   adding it
2. The function only checked chandef_usable, ignoring flags like RADAR
   which would prevent TDLS off-channel communcation.
3. HT20 was explicitly required in the chandef, while not a requirement
   for TDLS off-channel.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-01-14 09:34:33 +01:00
Emmanuel Grumbach
3b24f4c653 mac80211: let flush() drop packets when possible
When roaming / suspending, it makes no sense to wait until
the transmit queues of the device are empty. In extreme
condition they can be starved (VO saturating the air), but
even in regular cases, it is pointless to delay the roaming
because the low level driver is trying to send packets to
an AP which is far away. We'd rather drop these packets and
let TCP retransmit if needed. This will allow to speed up
the roaming.

For suspend, the explanation is even more trivial.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-01-14 09:31:18 +01:00
Arik Nemtsov
8a4d32f30d mac80211: add TDLS channel-switch Rx flow
When receiving a TDLS channel switch request or response, parse the frame
and call a new tdls_recv_channel_switch op in the low level driver with
the parsed data.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:45:26 +01:00
Arik Nemtsov
a7a6bdd067 mac80211: introduce TDLS channel switch ops
Implement the cfg80211 TDLS channel switch ops and introduce new mac80211
ones for low-level drivers.
Verify low-level driver support for the new ops when using the relevant
wiphy feature bit. Also verify the peer supports channel switching before
passing the command down.

Add a new STA flag to track the off-channel state with the TDLS peer and
make sure to cancel the channel-switch if the peer STA is unexpectedly
removed.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:45:21 +01:00
Arik Nemtsov
c273390569 mac80211: prepare TDLS mgmt code for channel-switch templates
Split the data-generating from the Tx-sending functionality, as we do
not want to send templates to the lower driver. Also add an optional
chandef argument to the data-generating portion. It will be used for
channel-switch templates.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:45:07 +01:00
Arik Nemtsov
78632a17ea cfg/mac80211: define TDLS channel switch feature bit
Define some related TDLS protocol constants and advertise channel switch
support in the extended-capabilities IE when the feature bit is defined.

Actually supporting TDLS channel-switching also requires support for
some new nl80211 commands, to be introduced by future patches.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:44:58 +01:00
Arik Nemtsov
2cedd87960 mac80211: add BSS coex IE to TDLS setup frames
Add the BSS coex IE in case we support HT40 channels, as mandated by
section 8.5.13 in IEEE802.11 2012.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:44:52 +01:00
Arik Nemtsov
f0d29cb979 mac80211: add supported channels IE during TDLS setup
This information element is mandatory in case TDLS channel-switching is to
be supported. The channels given are ones supported and allowed to be
active in the current regulatory setting.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:44:47 +01:00
Liad Kaufman
1277b4a9f5 mac80211: retransmit TDLS teardown packet through AP if not ACKed
Since the TDLS peer station might not receive the teardown
packet (e.g., when in PS), this makes sure the packet is
retransmitted - this time through the AP - if the TDLS peer
didn't ACK the packet.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-11-19 18:44:29 +01:00
Arik Nemtsov
8b94148cfe mac80211: expose TDLS-initiator value to low level driver
Some drivers need to know which station is the TDLS link initiator.
Expose this value via the mac80211 ieee80211_sta structure.

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>
2014-10-23 20:40:02 +02:00
Arik Nemtsov
59cd85cbcf mac80211: set network header in TDLS frames
Correctly mark the network header location in mac80211-generated TDLS
frames. These may be used by lower-level drivers.

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>
2014-09-11 12:25:22 +02:00
Johannes Berg
d98ad83ee8 mac80211: add Intel Mobile Communications copyright
Our legal structure changed at some point (see wikipedia), but
we forgot to immediately switch over to the new copyright
notice.

For files that we have modified in the time since the change,
add the proper copyright notice now.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-09-05 13:52:06 +02:00
Johannes Berg
a74a8c846f mac80211: don't duplicate station QoS capability data
We currently track the QoS capability twice: for all peer stations
in the WLAN_STA_WME flag, and for any clients associated to an AP
interface separately for drivers in the sta->sta.wme field.

Remove the WLAN_STA_WME flag and track the capability only in the
driver-visible field, getting rid of the limitation that the field
is only valid in AP mode.

Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-08-15 14:38:08 +02:00
Liad Kaufman
bb3f848608 mac80211: make sure TDLS teardown packet is sent on time
Since the teardown packet is created while the queues are
stopped, it isn't sent immediately, but rather is pending.
To be sure that when we flush the queues prior to destroying
the station we also send this packet - the tasklet handling
pending packets is invoked to flush the packets.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: ArikX Nemtsov <arik@wizery.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:05 +02:00
Arik Nemtsov
13cc8a4a1d mac80211: support HT for TDLS stations
Add the HT capabilities and HT operation information elements to TDLS
setup packets where appropriate.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Arik Nemtsov
81dd2b8822 mac80211: move TDLS data to mgd private part
We can only be a station for TDLS connections. Also fix a bug where
a delayed work could be left scheduled if the station interface was
brought down during TDLS setup.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Arik Nemtsov
6f7eaa47e1 mac80211: add TDLS QoS param IE on setup-confirm
When TDLS QoS is supported by the the peer and the local card, add
the WMM parameter IE to the setup-confirm frame. Take the QoS settings
from the current AP, or if unsupported, use the default values from
the specification. This behavior is mandated by IEEE802.11-2012 section
10.22.4.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Arik Nemtsov
40b861a0ee mac80211: add QoS IE during TDLS setup start
If QoS is supported by the card, add an appropriate IE to TDLS setup-
request and setup-response frames.

Consolidate the setting of the WMM info IE across mac80211.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Arik Nemtsov
dd8c0b03d3 mac80211: set TDLS capab to zero on failure frames
When sending setup-failure frames, set the capability field to zero, as
mandated by the specification (IEEE802.11-2012 8.5.13).

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
1606ef4a9d mac80211: avoid adding some IEs on TDLS setup failure packets
Most setup-specific information elements are not to be added when a
setup frame is sent with an error status code.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
f09a87d274 mac80211: split extra TDLS IEs in setup frames
When building TDLS setup frames, use the IE order mandates in the
specification, splitting extra IEs coming from usermode.

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>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
46792a2dfc mac80211: consolidate TDLS IE treatment
Add all information elements for TDLS discovery and setup in the same
function.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
6ae32e5d28 mac80211: fix error path for TDLS setup
The patch "8f02e6b mac80211: make sure TDLS peer STA exists during
setup" broke TDLS error paths where the STA doesn't exist when sending
the error.
Fix it by only testing for STA existence during a non-error flow.

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>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
626911cc60 mac80211: track TDLS initiator internally
Infer the TDLS initiator and track it in mac80211 via a STA flag. This
avoids breaking old userspace that doesn't pass it via nl80211 APIs.

The only case where userspace will need to pass the initiator is when the
STA is removed due to unreachability before a teardown packet is sent.
Support for unreachability was only recently added to wpa_supplicant, so
it won't be a problem in practice.

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>
2014-07-21 12:14:03 +02:00
Arik Nemtsov
ee10f2c779 mac80211: protect TDLS discovery session
After sending a TDLS discovery-request, we expect a reply to arrive on
the AP's channel. We must stay on the channel (no PSM, scan, etc.), since
a TDLS setup-response is a direct packet not buffered by the AP.
Add a new mac80211 driver callback to allow discovery session protection.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:28:19 +02:00
Arik Nemtsov
7adc3e4664 mac80211: make sure TDLS peer STA exists during setup
Make sure userspace added a TDLS peer station before invoking the
transmission of the first setup frame. This ensures packets to the peer
won't go through the AP path.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:28:18 +02:00
Arik Nemtsov
c887f0d3a0 mac80211: add API to request TDLS operation from userspace
Write a mac80211 to the cfg80211 API for requesting a userspace TDLS
operation. Define TDLS specific reason codes that can be used here.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:28:17 +02:00
Arik Nemtsov
db67d661e8 mac80211: implement proper Tx path flushing for TDLS
As the spec mandates, flush data in the AP path before transmitting the
first setup frame. Data packets transmitted during setup are already
dropped in the Tx path.

For the teardown flow, flush all packets in the direct path before
transmitting the teardown frame. Un-authorize the peer sta after teardown
is sent, forcing all subsequent Tx to the peer through the AP.

Make sure to flush the queues when disabling the link to get the
teardown packet out.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
[adjust to Luca's new quuee API and stop only vif queues]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:27:58 +02:00
Arik Nemtsov
191dd46905 mac80211: split tdls_mgmt function
There are setup/teardown specific actions to be done that accompany
the sending of a TDLS management packet. Split the main function to
simplify future additions.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:24:55 +02:00
Arik Nemtsov
2fb6b9b8e5 mac80211: use TDLS initiator in tdls_mgmt operations
The TDLS initiator is set once during link setup. If determines the
address ordering in the link identifier IE.
Use the value from userspace in order to have a correct teardown packet.
With the current code, a teardown from the responder side fails the TDLS
MIC check because of a bad link identifier IE.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:24:55 +02:00
Arik Nemtsov
31fa97c5de cfg80211: pass TDLS initiator in tdls_mgmt operations
The TDLS initiator is set once during link setup. If determines the
address ordering in the link identifier IE.

Fix dependent drivers - mwifiex and mac80211.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:24:55 +02:00
Arik Nemtsov
17e6a59a36 mac80211: cleanup TDLS state during failed setup
When setting up a TDLS session, register a delayed work to remove
the peer if setup times out. Prevent concurrent setups to support this
capacity.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-06-23 14:24:55 +02:00
Johannes Berg
3b3a0162fa cfg80211: constify MAC addresses in cfg80211 ops
This propagates through all the drivers and mac80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-05-19 17:34:42 +02:00
Arik Nemtsov
95224fe83e mac80211: move TDLS code to another file
With new additions planned, this code is getting too big for cfg.c.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-05-05 15:56:15 +02:00