Commit graph

53 commits

Author SHA1 Message Date
Johannes Berg
ccb6c1360f cfg80211: don't get expired BSSes
When kernel-internal users use cfg80211_get_bss()
to get a reference to a BSS struct, they may end
up getting one that would have been removed from
the list if there had been any userspace access
to the list. This leads to inconsistencies and
problems.

Fix it by making cfg80211_get_bss() ignore BSSes
that cfg80211_bss_expire() would remove.

Fixes http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2180

Cc: stable@kernel.org
Reported-by: Jiajia Zheng <jiajia.zheng@intel.com>
Tested-by: Jiajia Zheng <jiajia.zheng@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-07-14 13:52:45 -04:00
Sujith
22fe88d3d8 cfg80211: Fix signal_type comparison
signal_type is enum cfg80211_signal_type.

This fixes the gcc warning:

scan.c: In function `cfg80211_inform_bss':
scan.c:518:6: warning: comparison between `enum cfg80211_signal_type' and `enum nl80211_bss'
scan.c: In function `cfg80211_inform_bss_frame':
scan.c:574:6: warning: comparison between `enum cfg80211_signal_type' and `enum nl80211_bss'

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-05-21 14:39:59 -04:00
Tejun Heo
5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00
Johannes Berg
c21dbf9214 cfg80211: export cfg80211_find_ie
This new function (previously a static function
called just "find_ie" can be used to find a
specific IE in a buffer of IEs.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-01-26 11:53:20 -05:00
Jouni Malinen
34a6eddbab cfg80211: Store IEs from both Beacon and Probe Response frames
Store information elements from Beacon and Probe Response frames in
separate buffers to allow both sets to be made available through
nl80211. This allows user space applications to get access to IEs from
Beacon frames even if we have received Probe Response frames from the
BSS. Previously, the IEs from Probe Response frames would have
overridden the IEs from Beacon frames.

This feature is of somewhat limited use since most protocols include
the same (or extended) information in Probe Response frames. However,
there are couple of exceptions where the IEs from Beacon frames could
be of some use: TIM IE is only included in Beacon frames (and it would
be needed to figure out the DTIM period used in the BSS) and at least
some implementations of Wireless Provisioning Services seem to include
the full IE only in Beacon frames).

The new BSS attribute for scan results is added to allow both the IE
sets to be delivered. This is done in a way that maintains the
previously used behavior for applications that are not aware of the
new NL80211_BSS_BEACON_IES attribute.

Signed-off-by: Jouni Malinen <j@w1.fi>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-01-12 13:51:28 -05:00
Johannes Berg
65486c8b30 cfg80211: fix error path in cfg80211_wext_siwscan
If there's an invalid channel or SSID, the code leaks
the scan request. Always free the scan request, unless
it was successfully given to the driver.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-12-28 16:19:58 -05:00
David S. Miller
8f56874bd7 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 2009-12-04 13:25:15 -08:00
Joe Perches
f64f9e7192 net: Move && and || to end of previous line
Not including net/atm/

Compiled tested x86 allyesconfig only
Added a > 80 column line or two, which I ignored.
Existing checkpatch plaints willfully, cheerfully ignored.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-11-29 16:55:45 -08:00
Alban Browaeys
e60d7443e0 wireless : use a dedicated workqueue for cfg80211.
This patch moves the works cleanup, scan and events to a cfg80211
dedicated workqueue.

Platform driver like eeepc-laptop ought to use works to rfkill (as
new rfkill does lock in rfkill_unregister and the platform driver is
called from rfkill_switch_all which also lock the same mutex).
This raise a new issue in itself that the work scheduled by the platform
driver to the global worqueue calls wiphy_unregister which flush_work
scan and event works (which thus flush works on the global workqueue inside
a work on the global workqueue) and also put on hold the  wdev_cleanup_work
 (which prevents the dev_put on netdev thus indefinite Usage count error on
wifi device).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Alban Browaeys <prahal@yahoo.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-11-28 15:05:00 -05:00
Rui Paulo
76aa5e704c mac80211: update cfg80211 scan result code for the updated mesh conf IE
Signed-off-by: Rui Paulo <rpaulo@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-11-18 17:09:28 -05:00
Rui Paulo
136cfa2861 mac80211: use a structure to hold the mesh config information element
Signed-off-by: Rui Paulo <rpaulo@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-11-18 17:09:27 -05:00
Johannes Berg
584991dccf cfg80211: validate scan channels
Currently it is possible to request a scan on only
disabled channels, which could be problematic for
some drivers. Reject such scans, and also ignore
disabled channels that are given. This resuls in
the scan begin/end event only including channels
that are actually used.

This makes the mac80211 check for disabled channels
superfluous. At the same time, remove the no-IBSS
check from mac80211 -- nothing says that we should
not find any networks on channels that cannot be
used for an IBSS, even when operating in IBSS mode.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-11-02 15:43:29 -05:00
Johannes Berg
3d23e349d8 wext: refactor
Refactor wext to
 * split out iwpriv handling
 * split out iwspy handling
 * split out procfs support
 * allow cfg80211 to have wireless extensions compat code
   w/o CONFIG_WIRELESS_EXT

After this, drivers need to
 - select WIRELESS_EXT	- for wext support
 - select WEXT_PRIV	- for iwpriv support
 - select WEXT_SPY	- for iwspy support

except cfg80211 -- which gets new hooks in wext-core.c
and can then get wext handlers without CONFIG_WIRELESS_EXT.

Wireless extensions procfs support is auto-selected
based on PROC_FS and anything that requires the wext core
(i.e. WIRELESS_EXT or CFG80211_WEXT).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-10-07 16:39:43 -04:00
Holger Schurig
8862dc5f25 cfg80211: minimal error handling for wext-compat freq scanning
Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-09-14 14:36:04 -04:00
Holger Schurig
a4e7b730f1 cfg80211: use cfg80211_wext_freq() for freq conversion
WEXT's "struct iw_freq" can also be used to handle a channel. This patch now
uses cfg80211_wext_freq() instead of hand-converting the frequency. That
allows user-space to specify channels as well, like with SIOCSIWFREQ.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-09-14 14:36:04 -04:00
Holger Schurig
b2e3abdc70 cfg80211: allow scanning on specified frequencies when using wext-compatibility
Handles the case when SIOCSIWSCAN specified iw_scan_req.num_channels and
iw_scan_req.channels[].

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-09-09 11:25:27 -04:00
Bob Copeland
fcc6cb0c13 cfg80211: fix looping soft lockup in find_ie()
The find_ie() function uses a size_t for the len parameter, and
directly uses len as a loop variable.  If any received packets
are malformed, it is possible for the decrease of len to overflow,
and since the result is unsigned, the loop will not terminate.
Change it to a signed int so the loop conditional works for
negative values.

This fixes the following soft lockup:

[38573.102007] BUG: soft lockup - CPU#0 stuck for 61s! [phy0:2230]
[38573.102007] Modules linked in: aes_i586 aes_generic fuse af_packet ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state iptable_filter ip_tables x_tables acpi_cpufreq binfmt_misc dm_mirror dm_region_hash dm_log dm_multipath dm_mod kvm_intel kvm uinput i915 arc4 ecb drm snd_hda_codec_idt ath5k snd_hda_intel hid_apple mac80211 usbhid appletouch snd_hda_codec snd_pcm ath cfg80211 snd_timer i2c_algo_bit ohci1394 video snd processor ieee1394 rfkill ehci_hcd sg sky2 backlight snd_page_alloc uhci_hcd joydev output ac thermal button battery sr_mod applesmc cdrom input_polldev evdev unix [last unloaded: scsi_wait_scan]
[38573.102007] irq event stamp: 2547724535
[38573.102007] hardirqs last  enabled at (2547724534): [<c1002ffc>] restore_all_notrace+0x0/0x18
[38573.102007] hardirqs last disabled at (2547724535): [<c10038f4>] apic_timer_interrupt+0x28/0x34
[38573.102007] softirqs last  enabled at (92950144): [<c103ab48>] __do_softirq+0x108/0x210
[38573.102007] softirqs last disabled at (92950274): [<c1348e74>] _spin_lock_bh+0x14/0x80
[38573.102007]
[38573.102007] Pid: 2230, comm: phy0 Tainted: G        W  (2.6.31-rc7-wl #8) MacBook1,1
[38573.102007] EIP: 0060:[<f8ea2d50>] EFLAGS: 00010292 CPU: 0
[38573.102007] EIP is at cmp_ies+0x30/0x180 [cfg80211]
[38573.102007] EAX: 00000082 EBX: 00000000 ECX: ffffffc1 EDX: d8efd014
[38573.102007] ESI: ffffff7c EDI: 0000004d EBP: eee2dc50 ESP: eee2dc3c
[38573.102007]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[38573.102007] CR0: 8005003b CR2: d8efd014 CR3: 01694000 CR4: 000026d0
[38573.102007] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[38573.102007] DR6: ffff0ff0 DR7: 00000400
[38573.102007] Call Trace:
[38573.102007]  [<f8ea2f8d>] cmp_bss+0xed/0x100 [cfg80211]
[38573.102007]  [<f8ea33e4>] cfg80211_bss_update+0x84/0x410 [cfg80211]
[38573.102007]  [<f8ea3884>] cfg80211_inform_bss_frame+0x114/0x180 [cfg80211]
[38573.102007]  [<f97255ff>] ieee80211_bss_info_update+0x4f/0x180 [mac80211]
[38573.102007]  [<f972b118>] ieee80211_rx_bss_info+0x88/0xf0 [mac80211]
[38573.102007]  [<f9739297>] ? ieee802_11_parse_elems+0x27/0x30 [mac80211]
[38573.102007]  [<f972b224>] ieee80211_rx_mgmt_probe_resp+0xa4/0x1c0 [mac80211]
[38573.102007]  [<f972bc59>] ieee80211_sta_rx_queued_mgmt+0x919/0xc50 [mac80211]
[38573.102007]  [<c1009707>] ? sched_clock+0x27/0xa0
[38573.102007]  [<c1009707>] ? sched_clock+0x27/0xa0
[38573.102007]  [<c105ffd0>] ? mark_held_locks+0x60/0x80
[38573.102007]  [<c1348be5>] ? _spin_unlock_irqrestore+0x55/0x70
[38573.102007]  [<c134baa5>] ? sub_preempt_count+0x85/0xc0
[38573.102007]  [<c1348bce>] ? _spin_unlock_irqrestore+0x3e/0x70
[38573.102007]  [<c12c1c0f>] ? skb_dequeue+0x4f/0x70
[38573.102007]  [<f972c021>] ieee80211_sta_work+0x91/0xb80 [mac80211]
[38573.102007]  [<c1009707>] ? sched_clock+0x27/0xa0
[38573.102007]  [<c134baa5>] ? sub_preempt_count+0x85/0xc0
[38573.102007]  [<c10479af>] worker_thread+0x18f/0x320
[38573.102007]  [<c104794e>] ? worker_thread+0x12e/0x320
[38573.102007]  [<c1348be5>] ? _spin_unlock_irqrestore+0x55/0x70
[38573.102007]  [<f972bf90>] ? ieee80211_sta_work+0x0/0xb80 [mac80211]
[38573.102007]  [<c104cbb0>] ? autoremove_wake_function+0x0/0x50
[38573.102007]  [<c1047820>] ? worker_thread+0x0/0x320
[38573.102007]  [<c104c854>] kthread+0x84/0x90
[38573.102007]  [<c104c7d0>] ? kthread+0x0/0x90
[38573.102007]  [<c1003ab7>] kernel_thread_helper+0x7/0x10

Cc: stable@kernel.org
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-09-02 15:29:04 -04:00
Johannes Berg
01a0ac417c cfg80211: check lost scans later, fix bug
When we lose a scan, cfg80211 tries to clean up after
the driver. However, it currently does this too early,
it does this in GOING_DOWN already instead of DOWN, so
it may happen with mac80211. Besides fixing this, also
make it more robust by leaking the scan request so if
the driver later actually finishes the scan, it won't
crash. Also check in ___cfg80211_scan_done whether a
scan request is still pending and exit if not.

Reported-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-28 14:40:25 -04:00
Johannes Berg
36e6fea849 cfg80211: check for and abort dangling scan requests
If you trigger a scan request on an interface and then
take it down, or rmmod the module or unplug the device
the driver might "forget" to cancel the scan request.
That is a bug in the driver, but the current behaviour
is that we just hang endlessly waiting for the netdev
refcount to become 0 which it never will. To improve
robustness, check for this situation in cfg80211, warn
about it and clean up behind the driver. I don't just
clean up silently because it's likely that the driver
also has some internal state it has now leaked.

Additionally, this fixes a locking bug, clearing the
scan_req pointer should be done under the rdev lock.

Finally, we also need to _wait_ for the scan work and
not just abort it since it might be pending and wanting
to do a cleanup.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-14 09:14:07 -04:00
Johannes Berg
5ba63533bb cfg80211: fix alignment problem in scan request
The memory layout for scan requests was rather wrong,
we put the scan SSIDs before the channels which could
lead to the channel pointers being unaligned in memory.
It turns out that using a pointer to the channel array
isn't necessary anyway since we can embed a zero-length
array into the struct.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-14 09:13:44 -04:00
Johannes Berg
f5ea9120be nl80211: add generation number to all dumps
In order for userspace to be able to figure out whether
it obtained a consistent snapshot of data or not when
using netlink dumps, we need to have a generation number
in each dump message that indicates whether the list has
changed or not -- its value is arbitrary.

This patch adds such a number to all dumps, this needs
some mac80211 involvement to keep track of a generation
number to start with when adding/removing mesh paths or
stations.

The wiphy and netdev lists can be fully handled within
cfg80211, of course, but generation numbers need to be
stored there as well.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-14 09:13:43 -04:00
David S. Miller
aa11d958d1 Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
	arch/microblaze/include/asm/socket.h
2009-08-12 17:44:53 -07:00
Johannes Berg
cd3468bad9 cfg80211: add two missing NULL pointer checks
These pointers can be NULL, the is_mesh() case isn't
ever hit in the current kernel, but cmp_ies() can be
hit under certain conditions.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@kernel.org [2.6.29, 2.6.30]
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-03 16:31:21 -04:00
Johannes Berg
a9a11622c5 cfg80211: self-contained wext handling where possible
Finally! This is what you've all been waiting for!

This patch makes cfg80211 take care of wext emulation
_completely_ by itself, drivers that don't need things
cfg80211 doesn't do yet don't even need to be aware of
wireless extensions.
This means we can also clean up mac80211's and iwm's
Kconfig and make it possible to build them w/o wext
now!

		RIP wext.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-29 15:46:20 -04:00
Helmut Schaa
09f97e0fc4 cfg80211: increase scan result expire time
Using background scanning in mac80211 the time a scan needs to
finish can exceed 10 seconds. Hence, increase the scan results
expire time to 15 seconds which should be sufficient.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-27 15:24:17 -04:00
Johannes Berg
463d018323 cfg80211: make aware of net namespaces
In order to make cfg80211/nl80211 aware of network namespaces,
we have to do the following things:

 * del_virtual_intf method takes an interface index rather
   than a netdev pointer - simply change this

 * nl80211 uses init_net a lot, it changes to use the sender's
   network namespace

 * scan requests use the interface index, hold a netdev pointer
   and reference instead

 * we want a wiphy and its associated virtual interfaces to be
   in one netns together, so
    - we need to be able to change ns for a given interface, so
      export dev_change_net_namespace()
    - for each virtual interface set the NETIF_F_NETNS_LOCAL
      flag, and clear that flag only when the wiphy changes ns,
      to disallow breaking this invariant

 * when a network namespace goes away, we need to reparent the
   wiphy to init_net

 * cfg80211 users that support creating virtual interfaces must
   create them in the wiphy's namespace, currently this affects
   only mac80211

The end result is that you can now switch an entire wiphy into
a different network namespace with the new command
	iw phy#<idx> set netns <pid>
and all virtual interfaces will follow (or the operation fails).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-27 15:24:07 -04:00
David S. Miller
74d154189d Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
	drivers/net/wireless/iwmc3200wifi/netdev.c
	net/wireless/scan.c
2009-07-23 19:03:51 -07:00
Christian Lamparter
9e81eccf19 cfg80211: double free in __cfg80211_scan_done
This patch fixes a double free corruption in __cfg80211_scan_done:

 ================================================
 BUG kmalloc-512: Object already free
 ------------------------------------------------

 INFO: Allocated in load_elf_binary+0x18b/0x19af age=6
 INFO: Freed in load_elf_binary+0x104e/0x19af age=5
 INFO: Slab 0xffffea0001bae4c0 objects=14 used=7
 INFO: Object 0xffff88007e8a9918 @offset=6424 fp=0xffff88007e8a9488

 Bytes b4 0xffff88007e8a9908:  00 00 00 00 00 00 00 00 5a 5a
 [...]
 Pid: 28705, comm: rmmod Tainted: P         C 2.6.31-rc2-wl #1
 Call Trace:
  [<ffffffff810da9f4>] print_trailer+0x14e/0x16e
  [<ffffffff810daa56>] object_err+0x42/0x61
  [<ffffffff810dbcd9>] __slab_free+0x2af/0x396
  [<ffffffffa0ec9694>] ? wiphy_unregister+0x92/0x142 [cfg80211]
  [<ffffffff810dd5e3>] kfree+0x13c/0x17a
  [<ffffffffa0ec9694>] ? wiphy_unregister+0x92/0x142 [cfg80211]
  [<ffffffffa0ec9694>] wiphy_unregister+0x92/0x142 [cfg80211]
  [<ffffffffa0eed163>] ieee80211_unregister_hw+0xc8/0xff [mac80211]
  [<ffffffffa0f3fbc8>] p54_unregister_common+0x31/0x66 [p54common]
  [...]
 FIX kmalloc-512: Object at 0xffff88007e8a9918 not freed

The code path which leads to the *funny* double free:

       request = rdev->scan_req;
       dev = dev_get_by_index(&init_net, request->ifidx);
	/*
	 * the driver was unloaded recently and
	 * therefore dev_get_by_index will return NULL!
	 */
        if (!dev)
                goto out;
	[...]
	rdev->scan_req = NULL; /* not executed... */
	[...]
 out:
        kfree(request);

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-21 12:07:44 -04:00
Johannes Berg
667503ddcb cfg80211: fix locking
Over time, a lot of locking issues have crept into
the smarts of cfg80211, so e.g. scan completion can
race against a new scan, IBSS join can race against
leaving an IBSS, etc.

Introduce a new per-interface lock that protects
most of the per-interface data that we need to keep
track of, and sprinkle assertions about that lock
everywhere. Some things now need to be offloaded to
work structs so that we don't require being able to
sleep in functions the drivers call. The exception
to that are the MLME callbacks (rx_auth etc.) that
currently only mac80211 calls because it was easier
to do that there instead of in cfg80211, and future
drivers implementing those calls will, if they ever
exist, probably need to use a similar scheme like
mac80211 anyway...

In order to be able to handle _deauth and _disassoc
properly, introduce a cookie passed to it that will
determine locking requirements.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 15:02:32 -04:00
Johannes Berg
4d0c8aead3 cfg80211: properly name driver locking
Currently we call that cfg80211_put_dev(), but that is
misleading. With the new convention of using 'rdev' for
registered_device variables, also call that function
cfg80211_unlock_rdev().

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 15:02:32 -04:00
Johannes Berg
19957bb399 cfg80211: keep track of BSSes
In order to avoid problems with BSS structs going away
while they're in use, I've long wanted to make cfg80211
keep track of them. Without the SME, that wasn't doable
but now that we have the SME we can do this too. It can
keep track of up to four separate authentications and
one association, regardless of whether it's controlled
by the cfg80211 SME or the userspace SME.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 15:01:53 -04:00
Johannes Berg
6829c878ec cfg80211: emulate connect with auth/assoc
This adds code to cfg80211 so that drivers (mac80211 right
now) that don't implement connect but rather auth/assoc can
still be used with the nl80211 connect command. This will
also be necessary for the wext compat code.

Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 15:01:51 -04:00
Johannes Berg
a538e2d5a3 cfg80211: issue netlink notification when scan starts
To ease multiple apps working together smoothly,
send a notification when a scan is started.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 14:57:53 -04:00
Johannes Berg
2dce4c2b5f cfg80211: fix refcount leak
The code in cfg80211's cfg80211_bss_update erroneously
grabs a reference to the BSS, which means that it will
never be freed.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@kernel.org [2.6.29, 2.6.30]
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-07 12:55:28 -04:00
Johannes Berg
362a415dce nl80211: bounce scan request back to userspace
When a scan finishes only the program that asked for it
knows what kind of scan it was; let's tell everybody else
about the scan parameters as well so they can evaluate
the result of the scan better. Also helps with debugging.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-06-03 14:05:10 -04:00
David S. Miller
a8679be207 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 2009-05-08 12:46:17 -07:00
David S. Miller
22f6dacdfc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
	include/net/tcp.h
2009-05-08 02:48:30 -07:00
Michael Buesch
44e1b98f73 cfg80211: Use the correct IE buffer pointer
If the IE buffer was allocated, the pub.information_elements pointer
was also changed to the allocated space. So we must not assume anymore
that the pointer points at the "found" tail.

So if it was allocated previously, take the codebranch that grows the
buffer size (if necessary) and put the data into the allocated buffer.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-05-06 15:14:44 -04:00
Michael Buesch
273de92c84 cfg80211: Remove unnecessary ksize() call
This removes an unnecessary ksize() call. krealloc() will do this
test internally and won't perform any allocation if the space is
already sufficient to hold the data.
So remove the redundant check.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-05-06 15:14:42 -04:00
Johannes Berg
c0f0aac05f cfg80211: fix truncated IEs
Another bug in the "cfg80211: do not replace BSS structs" patch,
a forgotten length update leads to bogus data being stored and
passed to userspace, often truncated.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-05-04 16:22:10 -04:00
Johannes Berg
ba44cb7226 cfg80211: mark all WEXT handlers _GPL
The fact that these are exported is a technical detail
of the conversion period -- we don't want anybody to
start relying on these. Ultimately we want things to
use cfg80211 only, and once everything that is in wext
is converted to cfg80211 drivers will not need to touch
wext _at all_.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-04-22 16:57:18 -04:00
Jussi Kivilinna
06aa7afaaa cfg80211: add cfg80211_inform_bss
Added cfg80211_inform_bss() for full-mac devices to use.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-04-22 16:54:36 -04:00
Johannes Berg
cd1658f592 cfg80211: do not replace BSS structs
Instead, allocate extra IE memory if necessary. Normally,
this isn't even necessary since there's enough space.

This is a better way of correcting the "held BSS can
disappear" issue, but also a lot more code. It is also
necessary for proper auth/assoc BSS handling in the
future.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-04-17 15:27:13 -04:00
Johannes Berg
160002fe84 cfg80211: copy hold when replacing BSS
When we receive a probe response frame we can replace the
BSS struct in our list -- but if that struct is held then
we need to hold the new one as well.

We really should fix this completely and not replace the
struct, but this is a bandaid for now.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-04-17 15:27:13 -04:00
Kalle Valo
a08c1c1ac0 cfg80211: add feature to hold bss
In beacon filtering there needs to be a way to not expire the BSS even
when no beacons are received. Add an interface to cfg80211 to hold
BSS and make sure that it's not expired.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-03-27 20:13:13 -04:00
Luis R. Rodriguez
e38f8a7a8b cfg80211: Add AP beacon regulatory hints
When devices are world roaming they cannot beacon or do active scan
on 5 GHz or on channels 12, 13 and 14 on the 2 GHz band. Although
we have a good regulatory API some cards may _always_ world roam, this
is also true when a system does not have CRDA present. Devices doing world
roaming can still passive scan, if they find a beacon from an AP on
one of the world roaming frequencies we make the assumption we can do
the same and we also remove the passive scan requirement.

This adds support for providing beacon regulatory hints based on scans.
This works for devices that do either hardware or software scanning.
If a channel has not yet been marked as having had a beacon present
on it we queue the beacon hint processing into the workqueue.

All wireless devices will benefit from beacon regulatory hints from
any wireless device on a system including new devices connected to
the system at a later time.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-02-27 14:52:59 -05:00
Johannes Berg
77965c970d cfg80211: clean up signal type
It wasn't a good idea to make the signal type a per-BSS option,
although then it is closer to the actual value. Move it to be
a per-wiphy setting, update mac80211 to match.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-02-27 14:52:42 -05:00
Johannes Berg
a77b855245 cfg80211/mac80211: fill qual.qual value/adjust max_qual.qual
Due to various bugs in the software stack we end up having
to fill qual.qual; level should be used, but wpa_supplicant
doesn't properly ignore qual.qual, NM should use qual.level
regardless of that because qual.qual is 0 but doesn't handle
IW_QUAL_DBM right now.

So fill qual.qual with the qual.level value clamped to
-110..-40 dBm or just the regular 'unspecified' signal level.
This requires a mac80211 change to properly announce the
max_qual.qual and avg_qual.qual values.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-02-27 14:52:40 -05:00
Dan Williams
cb3a8eec0e cfg80211: age scan results on resume
Scanned BSS entries are timestamped with jiffies, which doesn't
increment across suspend and hibernate.  On resume, every BSS in the
scan list looks like it was scanned within the last 10 seconds,
irregardless of how long the machine was actually asleep.  Age scan
results on resume with the time spent during sleep so userspace has a
clue how old they really are.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-02-27 14:52:40 -05:00
Johannes Berg
79420f09e7 cfg80211: add more flexible BSS lookup
Add a more flexible BSS lookup function so that mac80211 or
other drivers can actually use this for getting the BSS to
connect to.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-02-13 13:45:56 -05:00