linux-stable.git/net/wireless/scan.c, branch v3.8

cfg80211: off by one in ieee80211_bss()

2013-01-24T14:47:22+00:00

We do a:

	sprintf(buf, " Last beacon: %ums ago",
		elapsed_jiffies_msecs(bss->ts));

elapsed_jiffies_msecs() can return a 10 digit number so "buf" needs to
be 31 characters long.

Signed-off-by: Dan Carpenter 
Signed-off-by: Johannes Berg

cfg80211: fix BSS struct IE access races

2012-11-30T12:42:20+00:00

When a BSS struct is updated, the IEs are currently
overwritten or freed. This can lead to races if some
other CPU is accessing the BSS struct and using the
IEs concurrently.

Fix this by always allocating the IEs in a new struct
that holds the data and length and protecting access
to this new struct with RCU.

Signed-off-by: Johannes Berg

cfg80211: fix cmp_hidden_bss

2012-11-30T12:41:26+00:00

The cmp_bss() comparator function uses memcmp() to
compare the SSID. This means that cmp_hidden_bss()
needs to similarly return a number bigger than zero
(use 1) instead of -1 when ie1 is bigger than ie2,
which is the case if an ie2 byte is non-zero.

Signed-off-by: Johannes Berg

cfg80211: fix whitespace in scan handling

2012-11-30T12:41:25+00:00

Fix a number of indentation and similar issues.

Signed-off-by: Johannes Berg

cfg80211: don't BUG_ON BSS struct issues

2012-11-30T12:41:24+00:00

There's no need to stop the machine, just leak
the BSS entry if there's an issue with its hold
counter when freeing.

Signed-off-by: Johannes Berg

cfg80211: use DS or HT operation IEs to determine BSS channel

2012-11-23T13:23:30+00:00

Currently, mac80211 checks the DS params IE if present and
uses it for the (primary) BSS channel, instead of the one
that the frame was received on. This is particularly useful
in the 2.4 GHz band since a frame is often received on one
of the adjacent channels due to overlap.

Move this code to cfg80211 so other drivers also do this.

Additionally, on 5 GHz, in particular with some (possibly)
upcoming changes in 802.11ai and duplicate transmissions
when wider channels are used, something similar happens.
So if present, also use the (primary) channel information
contained in the HT operation IE.

Signed-off-by: Johannes Berg

cfg80211: add cfg80211 exported function tracing

2012-10-18T08:53:38+00:00

Also add tracing to the API functions that drivers
(and mac80211) can call in cfg80211.

Signed-off-by: Beni Lev 
Reviewed-by: Emmanuel Grumbach 
Reviewed-by: Johannes Berg 
Signed-off-by: Johannes Berg

cfg80211: add wrappers for registered_device_ops

2012-10-18T08:53:37+00:00

This will allow adding central tracing like in mac80211.

Signed-off-by: Hila Gonen 
Reviewed-by: Emmanuel Grumbach 
Reviewed-by: Johannes Berg 
Signed-off-by: Johannes Berg

cfg80211: add support for flushing old scan results

2012-10-18T07:01:52+00:00

Add an NL80211_SCAN_FLAG_FLUSH flag that causes old bss cache
entries to be flushed on scan completion. This is useful for
collecting guaranteed fresh scan/survey result (e.g. on resume).

For normal scan, flushing only happens on successful completion
of a scan; i.e. it does not happen if the scan is aborted.
For scheduled scan, previous scan results are flushed everytime
when we get new scan results.

This feature is enabled by default. Drivers can disable it by
unsetting the NL80211_FEATURE_SCAN_FLUSH flag.

Signed-off-by: Sam Leffler 
Tested-by: Amitkumar Karwar 
Signed-off-by: Amitkumar Karwar 
Signed-off-by: Bing Zhao 
[invert polarity of feature flag to account for old kernels]
Signed-off-by: Johannes Berg

cfg80211: code rearrangement to avoid forward declarations

2012-10-18T07:01:26+00:00

bss_release() and __cfg80211_unlink_bss() function definitions
are moved at the begining of the file. They are used in next
patch in this series.

Signed-off-by: Amitkumar Karwar 
Signed-off-by: Bing Zhao 
Signed-off-by: Johannes Berg