Commit Graph

67 Commits

Author SHA1 Message Date
yuan linyu b952f4dff2 net: manual clean code which call skb_put_[data:zero]
Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-20 13:30:15 -04:00
Johannes Berg 4df864c1d9 networking: make skb_put & friends return void pointers
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions (skb_put, __skb_put and pskb_put) return void *
and remove all the casts across the tree, adding a (u8 *) cast only
where the unsigned char pointer was used directly, all done with the
following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_put, __skb_put };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_put, __skb_put };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

which actually doesn't cover pskb_put since there are only three
users overall.

A handful of stragglers were converted manually, notably a macro in
drivers/isdn/i4l/isdn_bsdcomp.c and, oddly enough, one of the many
instances in net/bluetooth/hci_sock.c. In the former file, I also
had to fix one whitespace problem spatch introduced.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:39 -04:00
Johannes Berg 59ae1d127a networking: introduce and use skb_put_data()
A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:37 -04:00
Johannes Berg b080db5853 networking: convert many more places to skb_put_zero()
There were many places that my previous spatch didn't find,
as pointed out by yuan linyu in various patches.

The following spatch found many more and also removes the
now unnecessary casts:

    @@
    identifier p, p2;
    expression len;
    expression skb;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_zero(skb, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_zero(skb, len);
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, len);
    |
    -memset(p, 0, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_zero(skb, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_zero(skb, sizeof(t));
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, sizeof(*p));
    |
    -memset(p, 0, sizeof(*p));
    )

    @@
    expression skb, len;
    @@
    -memset(skb_put(skb, len), 0, len);
    +skb_put_zero(skb, len);

Apply it to the tree (with one manual fixup to keep the
comment in vxlan.c, which spatch removed.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:35 -04:00
Mohammed Shafi Shajakhan 21a8e9dd52 mac80211: Fix possible sband related NULL pointer de-reference
Existing API 'ieee80211_get_sdata_band' returns default 2 GHz band even
if the channel context configuration is NULL. This crashes for chipsets
which support 5 Ghz alone when it tries to access members of 'sband'.
Channel context configuration can be NULL in multivif case and when
channel switch is in progress (or) when it fails. Fix this by replacing
the API 'ieee80211_get_sdata_band' with  'ieee80211_get_sband' which
returns a NULL pointer for sband when the channel configuration is NULL.

An example scenario is as below:

In multivif mode (AP + STA) with drivers like ath10k, when we do a
channel switch in the AP vif (which has a number of clients connected)
and a STA vif which is connected to some other AP, when the channel
switch in AP vif fails, while the STA vifs tries to connect to the
other AP, there is a window where the channel context is NULL/invalid
and this results in a crash  while the clients connected to the AP vif
tries to reconnect and this race is very similar to the one investigated
by Michal in https://patchwork.kernel.org/patch/3788161/ and this does
happens with hardware that supports 5Ghz alone after long hours of
testing with continuous channel switch on the AP vif

ieee80211 phy0: channel context reservation cannot be finalized because
some interfaces aren't switching
wlan0: failed to finalize CSA, disconnecting
wlan0-1: deauthenticating from 8c:fd:f0:01:54:9c by local choice
	(Reason: 3=DEAUTH_LEAVING)

	WARNING: CPU: 1 PID: 19032 at net/mac80211/ieee80211_i.h:1013 sta_info_alloc+0x374/0x3fc [mac80211]
	[<bf77272c>] (sta_info_alloc [mac80211])
	[<bf78776c>] (ieee80211_add_station [mac80211]))
	[<bf73cc50>] (nl80211_new_station [cfg80211])

	Unable to handle kernel NULL pointer dereference at virtual
	address 00000014
	pgd = d5f4c000
	Internal error: Oops: 17 [#1] PREEMPT SMP ARM
	PC is at sta_info_alloc+0x380/0x3fc [mac80211]
	LR is at sta_info_alloc+0x37c/0x3fc [mac80211]
	[<bf772738>] (sta_info_alloc [mac80211])
	[<bf78776c>] (ieee80211_add_station [mac80211])
	[<bf73cc50>] (nl80211_new_station [cfg80211]))

Cc: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-04-28 12:28:44 +02:00
Arik Nemtsov 554d072e7b mac80211: TDLS: don't require beaconing for AP BW
Stop downgrading TDLS chandef when reaching the AP BW. The AP provides
the necessary regulatory protection in this case.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=153961, which
reported an infinite loop here.

Reported-by: Kamil Toman <kamil.toman@gmail.com>
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-08-30 08:03:41 +02:00
Dan Carpenter 49708e3772 mac80211: silence an uninitialized variable warning
We normally return an uninitialized value, but no one checks it so it
doesn't matter.  Anyway, let's silence the static checker warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
2016-06-30 12:06:19 +02:00
Johannes Berg 57fbcce37b cfg80211: remove enum ieee80211_band
This enum is already perfectly aliased to enum nl80211_band, and
the only reason for it is that we get IEEE80211_NUM_BANDS out of
it. There's no really good reason to not declare the number of
bands in nl80211 though, so do that and remove the cfg80211 one.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-04-12 15:56:15 +02:00
Ilan Peer 4b559ec0bf mac80211: Fix BW upgrade for TDLS peers
It is possible that the station is connected to an AP
with bandwidth of 80+80MHz or 160MHz. In such cases
there is no need to perform an upgrade as the maximal
supported bandwidth is 80MHz.

In addition, when upgrading and setting center_freq1
and bandwidth to 80MHz also set center_freq2 to 0.

Fixes: 0fabfaafec ("mac80211: upgrade BW of TDLS peers when possible"
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>
2016-04-05 11:26:33 +02:00
Arik Nemtsov 59021c6759 mac80211: TDLS: change BW calculation for WIDER_BW peers
The previous approach simply ignored chandef restrictions when calculating
the appropriate peer BW for a WIDER_BW peer. This could result in a
regulatory violation if both peers indicated 80MHz support, but the
regdomain forbade it.

Change the approach to setting a WIDER_BW peer's BW. Don't exempt it from
the chandef width at first. If during TDLS negotiation the chandef width
is upgraded, update the peer's BW to match.

Fixes: 0fabfaafec ("mac80211: upgrade BW of TDLS peers when possible")
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>
2016-04-05 10:50:52 +02:00
Arik Nemtsov db8d99774c mac80211: TDLS: always downgrade invalid chandefs
Even if the current chandef width is equal to the station's max-BW, it
doesn't mean it's a valid width for TDLS. Make sure to always check
regulatory constraints in these cases.

Fixes: 0fabfaafec ("mac80211: upgrade BW of TDLS peers when possible")
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>
2016-04-05 10:50:32 +02:00
Arik Nemtsov 57f255f581 mac80211: TDLS: add proper HT-oper IE
When 11n peers performs a TDLS connection on a legacy BSS, the HT
operation IE must be specified according to IEEE802.11-2012 section
9.23.3.2. Otherwise HT-protection is compromised and the medium becomes
noisy for both the TDLS and the BSS links.

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>
2015-11-03 10:42:47 +01:00
David S. Miller 2579c98f0d For the current cycle, we have the following right now:
* many internal fixes, API improvements, cleanups, etc.
  * full AP client state tracking in cfg80211/mac80211 from Ayala
  * VHT support (in mac80211) for mesh
  * some A-MSDU in A-MPDU support from Emmanuel
  * show current TX power to userspace (from Rafał)
  * support for netlink dump in vendor commands (myself)
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Merge tag 'mac80211-next-for-davem-2015-10-05' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
For the current cycle, we have the following right now:
 * many internal fixes, API improvements, cleanups, etc.
 * full AP client state tracking in cfg80211/mac80211 from Ayala
 * VHT support (in mac80211) for mesh
 * some A-MSDU in A-MPDU support from Emmanuel
 * show current TX power to userspace (from Rafał)
 * support for netlink dump in vendor commands (myself)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-07 04:29:18 -07:00
Arik Nemtsov dd55ab59b6 mac80211: TDLS: check reg with IR-relax on chandef upgrade
When checking if a TDLS chandef can be upgraded, IR-relaxation can be
taken into account to allow more channels.

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>
2015-09-22 15:21:21 +02:00
Arik Nemtsov 82c0cc90d6 mac80211: debugfs: add file to disallow TDLS wider-bw
Sometimes we are interested in testing TDLS performance in a specific
width setting. Add the ability to disable the wider-band feature, thereby
allowing the TDLS channel width to be controlled by the BSS width.

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>
2015-09-22 15:21:21 +02:00
Avri Altman 22f66895e6 mac80211: protect non-HT BSS when HT TDLS traffic exists
HT TDLS traffic should be protected in a non-HT BSS to avoid
collisions. Therefore, when TDLS peers join/leave, check if
protection is (now) needed and set the ht_operation_mode of
the virtual interface according to the HT capabilities of the
TDLS peer(s).

This works because a non-HT BSS connection never sets (or
otherwise uses) the ht_operation_mode; it just means that
drivers must be aware that this field applies to all HT
traffic for this virtual interface, not just the traffic
within the BSS. Document that.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-09-04 14:25:46 +02:00
Arik Nemtsov 42d8d78961 mac80211: TDLS: deny ch-switch req on disallowed channels
If a TDLS station is not allowed to beacon on a channel, don't accept
a channel switch request to this channel.
Move channel building code up to avoid lockdep violations - reg_can_beacon
needs to take the wdev lock.

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>
2015-07-17 15:40:35 +02:00
Arik Nemtsov c8ff71e667 mac80211: TDLS: handle chan-switch in RTNL locked work
Move TDLS channel-switch Rx handling into an RTNL locked work. This is
required to add proper regulatory checking to incoming channel-switch
requests.
Queue incoming requests in a dedicated skb queue and handle the request
in a device-specific work to avoid deadlocking on interface removal.

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>
2015-07-17 15:40:15 +02:00
Johannes Berg 72bbe3d1c2 Merge branch 'mac80211' into mac80211-next
This is necessary to merge the new TDLS and mesh patches,
as they depend on some fixes.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-07-17 15:39:41 +02:00
Arik Nemtsov d51c2ea370 mac80211: TDLS: correctly configure SMPS state
The IEEE802.11-2012 specification is vague regarding SMPS operation during
TDLS. It does not define a clear way to transition between SMPS states.

To avoid interop issues, set SMPS to off when TDLS peers are connected.
Accomplish this by extending the definition of the AUTOMATIC state. If the
driver forces a state other than OFF, disconnect all TDLS peers.

While at it, avoid changing the SMPS state of the peer STA. We have no
way to control it, so try and behave correctly towards it.

Move the TDLS peer-teardown function to where the rest of the TDLS code
resides.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-07-17 15:38:18 +02:00
Arik Nemtsov 0fabfaafec mac80211: upgrade BW of TDLS peers when possible
Define a station chandef, to be used for wider-bw TDLS peers. When both
peers support the feature, upgrade the channel bandwidth to the maximum
allowed by both peers and regulatory. Currently widths up to 80MHz are
supported in the 5GHz band.

When a TDLS peer connects/disconnects recalculate the channel type of the
current chanctx.
Make the chanctx width calculation consider wider-bw TDLS peers and
similarly fix the max_required_bw calculation for the chanctx min_def.
Since the sta->bandwidth is calculated only later on, take
bss_conf.chandef.width as the minimal width for station interface.

Set the upgraded channel width in the VHT-operation set during TDLS setup.

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>
2015-07-17 15:38:12 +02:00
Arik Nemtsov b98fb44ffc mac80211: define TDLS wider BW support bits
Allow a device to specify support for the TDLS wider-bandwidth feature.
Indicate this support during TDLS setup in the ext-capab IE and set an
appropriate station flag when our TDLS peer supports it.
This feature gives TDLS peers the ability to use a wider channel than
the base width of the BSS. For instance VHT capable TDLS peers connected
on a 20MHz channel can extend the channel to 80MHz, if regulatory
considerations allow it.

Do not cap the bandwidth of such stations by the current BSS channel width
in mac80211.

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>
2015-07-17 15:38:11 +02:00
Arik Nemtsov 923b352f19 cfg80211: use RTNL locked reg_can_beacon for IR-relaxation
The RTNL is required to check for IR-relaxation conditions that allow
more channels to beacon. Export an RTNL locked version of reg_can_beacon
and use it where possible in AP/STA interface type flows, where
IR-relaxation may be applicable.

Fixes: 06f207fc54 ("cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA")
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>
2015-07-17 15:02:02 +02:00
Johannes Berg 30686bf7f5 mac80211: convert HW flags to unsigned long bitmap
As we're running out of hardware capability flags pretty quickly,
convert them to use the regular test_bit() style unsigned long
bitmaps.

This introduces a number of helper functions/macros to set and to
test the bits, along with new debugfs code.

The occurrences of an explicit __clear_bit() are intentional, the
drivers were never supposed to change their supported bits on the
fly. We should investigate changing this to be a per-frame flag.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-06-10 16:05:36 +02:00
Johannes Berg ea1b2b45f5 mac80211: remove short slot/short preamble incapable flags
There are no drivers setting IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE
or IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE, so any code using the
two flags is dead; it's also exceedingly unlikely that any new driver
could ever need to set these flags.

The wcn36xx code is almost certainly broken, but this preserves the
previous behaviour.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-06-02 20:28:58 +02:00
Arik Nemtsov c5a71688e1 mac80211: disconnect TDLS stations on STA CSA
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>
2015-05-20 15:14:54 +02:00
Arik Nemtsov 890b7878e4 mac80211: TDLS: use the BSS chandef for HT/VHT operation IEs
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>
2015-05-11 14:52:15 +02:00
Arik Nemtsov 070e176a75 mac80211: send HT/VHT IEs in TDLS discovery response
These are mandated by IEEE802.11-2012 section 8.5.8.6 and IEEE802.11ac-2013
section 8.5.8.16.

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>
2015-03-30 10:48:59 +02:00
Arik Nemtsov a38700dd48 cfg/mac80211: add regulatory classes IE during TDLS setup
Seems Broadcom TDLS peers (Nexus 5, Xperia Z3) refuse to allow TDLS
connection when channel-switching is supported but the regulatory
classes IE is missing from the setup request.
Add a chandef to reg-class translation function to cfg80211 and use it
to add the required IE during setup. For now add only the current
regulatory class as supported - it is enough to resolve the
compatibility issue.

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>
2015-03-30 10:26:36 +02:00
Arik Nemtsov ae2e9fba85 mac80211: allow TDLS setup code to take wdev lock
TDLS off-channel can be allowed in channels marked with GO_CONCURRENT,
provided the device is connected to an AP on the same UNII.
When relaxing the NO-IR requirements for TDLS, we might hit flows in
cfg80211_reg_can_beacon that acquire the wdev lock. Take some measures
to allow this during TDLS setup.
Acquire the RCU read lock later in the flow that invokes
cfg80211_reg_can_beacon.
Avoid taking local->mtx when preparing the setup packet to avoid
circular deadlocks with mac80211 code that is invoked with wdev-mtx
held.

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>
2015-03-04 10:34:10 +01:00
Arik Nemtsov fb28ec0ce4 mac80211: TDLS: support VHT between peers
Add the AID and VHT-cap/operation IEs during TDLS setup. Remove the
block of TDLS peers when setting HT-caps of the peer station.

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>
2015-03-03 15:56:07 +01:00
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