Commit graph

70 commits

Author SHA1 Message Date
Jouni Malinen
86b47aaf36 Drop sched_scan filter if not enough match sets supported
Instead of including only a single SSID in the sched_scan request if
the driver does not support match sets, just drop the SSID filter and
configure more SSIDs up to the sched_scan limit.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2011-11-28 17:52:36 +02:00
Jouni Malinen
a8cb5a8897 Make sched_scan debug clearer on timeout use
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2011-11-28 17:52:02 +02:00
Jouni Malinen
7c6a266ced Fix sched_scan filter_ssids setting for no filters case
The filter_ssids pointer needs to be set to NULL if no SSID filters
are set to avoid filtering out all scan results.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2011-11-28 15:19:41 +02:00
Jouni Malinen
fcd1684787 Fix sched_scan filter setting for max_match_sets == 0
The previous implementation was trying to add the first SSID
to a zero-length array. Avoid this with an explicit validation
of the array length.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2011-11-25 18:12:04 +02:00
Jouni Malinen
3f56f3a496 Do not try to add wildcard SSID into active sched_scan
Even though scan_ssid should not really be set for wildcard SSID,
better verify that here explicitly insead of assuming that the
SSID is set.

Signed-hostap: Jouni Malinen <j@w1.fi>
2011-11-19 17:01:53 +02:00
Eyal Shapira
1966e3d1b7 sched scan: Fix passive scanning
Scan wasn't initiated in case the config contained only networks without
scan_ssid. In such a case we want scan to be initiated without any SSIDs
to actively scan but include all the SSIDs in the filter list. Also
added some debug logs to easily see which SSIDs were included in which
list.

Cc: Luciano Coelho <coelho@ti.com>
Signed-off-by: Eyal Shapira <eyal@wizery.com>
2011-11-18 23:05:57 +02:00
Jouni Malinen
aa820e02cc Clean up debug dump for scan results sorting
There is not much need for showing the interim qsort steps, so just show
the ordered results.

Signed-hostap: Jouni Malinen <j@w1.fi>
2011-10-30 21:08:34 +02:00
Gary Morain
577db0aedd Prefer 5 GHz networks over 2.4 GHz networks
In scan.c, merge a channel's noise value into the scan results. When
comparing scan results, compute the signal-to-noise ratio and use it
when available. Prefer a 5 GHz network if its SNR is really big (> 30)
or if its SNR is relatively close to the other network's.
2011-10-30 21:08:21 +02:00
Jouni Malinen
d1dd48e3c9 P2P: Indicate scan during group formation as P2P probe
The interface may not yet have been set to P2P client mode immediately
after GO Negotiation when doing the scan before association request.
Consequently, the scan request in this state has to specify that the
specific P2P probe mode is used to disable IEEE 802.11b rates.

Signed-hostap: Jouni Malinen <j@w1.fi>
2011-10-29 23:02:47 +03:00
Jouni Malinen
17fbb751e1 Remove user space client MLME
This code was used only with driver_test.c to allow MLME operations
in hostapd to be tested without having to use a real radio. There
are no plans on extending this to any other use than testing and
mac80211_hwsim has now obsoled the need for this type of testing.
As such, we can drop this code from wpa_supplicant to clean up the
implementation of unnecessary complexity.
2011-10-22 22:45:38 +03:00
Jouni Malinen
9e0e6902a2 Share a single wpa_scan_results_free() implementation
There is not really a very good location for this anywhere, but the
function is small enough to live as an inline function for now.
2011-10-22 22:09:40 +03:00
Jouni Malinen
11540c0b21 Interworking: Allow ANT to be configured for Probe Request frames
Access Network Type can now be configured (default: 15 = wildcard) to
limit which APs reply to the scan.
2011-10-21 12:44:29 +03:00
Jouni Malinen
46ee0427b1 IEEE 802.11u: Allow Interworking and HESSID to be configured
The new wpa_supplicant.conf file global parameters interworking and
hessid can be used to configure wpa_supplicant to include
Interworking element in Probe Request frames.
2011-10-16 23:55:34 +03:00
Luciano Coelho
6a90053cdf Add delayed scheduled scan request
When initializing, the scheduled scan code was being called before
everything is ready. With normal scans, the first scan round is
delayed, so the initialization is finished by the time it really
starts.

Add a function that can be used to request a delayed scheduled scan.
The scan will only start after the specified time has elapsed. Call
this function instead of starting the scheduled scan directly during
driver initialization.

Signed-off-by: Luciano Coelho <coelho@ti.com>
2011-10-15 18:53:14 +03:00
Luciano Coelho
b59e6f267b Add filter support to scheduled scans
Pass SSIDs to be matched in scheduled scan results. Only the SSIDs
that are included in the match lists will be reported by the driver,
so the filtering can be offloaded to the hardware and the power
consumption can be reduced.

Signed-off-by: Luciano Coelho <coelho@ti.com>
2011-10-15 18:53:14 +03:00
Luciano Coelho
cbdf3507e9 Add scheduled scan driver operations
In new Linux kernel versions (>=3.0), nl80211 adds scheduled scan
capability. In order to use this feature to its full extent, we need
to support it in the wpa_supplicant core, so that it can also be used
by other drivers.

This commit adds initial scheduled scan support operations and events.

Signed-off-by: Luciano Coelho <coelho@ti.com>
2011-10-15 18:53:13 +03:00
Luciano Coelho
5f738a21a6 Reorganize P2P and WPS scan code
Move some code to separate functions to reorganize the P2P and WPS
handling during scans. This makes the code a bit cleaner and is
needed for the scheduled scan implementation to avoid duplicated code.

Signed-off-by: Luciano Coelho <coelho@ti.com>
2011-10-15 18:53:13 +03:00
Jouni Malinen
206e1f422f P2P: Provide mechanism for figuring out p2p_scan_ie() buffer need
The new function, p2p_scan_ie_buf_len(), can be used to figure out
how large a buffer needs to be allocated for p2p_scan_ie() use. This
makes it easier to add new data into the buffer without forcing all
callers to be updated to use a larger buffer.
2011-09-29 22:18:23 +03:00
Jouni Malinen
303f60d39b P2P: Do not request station mode scans during P2P operations
The P2P search mechanism depends on the same scan functionality that
is used for station mode scans. If these operations are being used
at the same time, scan result processing is not handled properly.
Avoid unexpected behavior by delaying station mode scan requests
if a P2P operation is in progress.

Among other things, this allows the station mode connection attempt
to be continued after a P2P find or group formation has been completed
if the interface is available (i.e., when the P2P group uses a
separate virtual interface).
2011-09-29 16:53:55 +03:00
Jouni Malinen
7dcdcfd68d P2P: Start GO without extra scan step
There are some corner cases, where the wpa_supplicant_req_scan() call
may end up scheduling a scan even if we are about to start a GO. Avoid
this by explicitly marking the GO network to be selected for the next
connection.
2011-06-21 11:47:03 +03:00
Jean-Michel Bachot
046ef4aa67 P2P: Add option for requested device type in P2P search/scan
With this, p2p_find can be extended to find certain requested device
types.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2011-03-19 12:57:46 +02:00
Ben Greear
f049052b9e Use wpa_msg() instead of wpa_printf()
This converts number of debugging messages to use wpa_msg() in order
to allow the interface name to be shown with the messages.

A new function, wpa_dbg(), is introduced to allow
CONFIG_NO_STDOUT_DEBUG=y builds to remove the debug strings. This is
otherwise identical with wpa_msg(), but it gets compiled out if stdout
debugging is disabled.
2011-02-10 20:14:46 +02:00
Jouni Malinen
5471c3434e Blacklist BSS on first failure if only a single network is enabled
The special case of requiring blacklisting count to be 2 or higher
is only needed when more than a single network is currently enabled.
As such, we should not do that when only a single network is enabled.
This make the station more likely to follow network side load
balancing attempts where the current AP may disassociate us with
an assumption that we would move to another AP.
2010-11-26 11:23:50 +02:00
Jouni Malinen
f47d639d49 SME: Optimize recovery from common load balancing mechanisms
When authentication or association fails when trying to connect to
a BSS in an ESS that has multiple BSSes based on previous scans,
limit the first recovery scan to only the known channels that has
been seen previously. This speeds up recovery in some of the most
commonly used load balancing mechanisms in enterprise WLAN
networks.
2010-11-25 22:51:56 +02:00
Jouni Malinen
2af1c18735 P2P: Scan all channels if GO is not found from common channels
This is not supposed to happen, but in theory, the GO may end up
changing its channels at some point. While it would be reasonable
to use one of the common channels, GO may be forced to use another
channel. The most likely reason for this would be if the P2P client
is enforcing only a single channel to be used (e.g., to avoid
multi-channel concurrent operations).
2010-10-19 18:38:49 +03:00
Jouni Malinen
af8ab1ae97 P2P: Use 'Enrollee info' WPS request type in P2P scans
This avoids setting explicit Request-to-Enrollee request when
WPS 2.0 is used.
2010-09-09 07:17:20 -07:00
Jouni Malinen
0817de904e P2P: Optimize scan timeouts for group formation 2010-09-09 07:17:17 -07:00
Jouni Malinen
0e65037c27 P2P: Add P2P IE into Probe Request frames 2010-09-09 07:17:17 -07:00
Jouni Malinen
54f489be45 WPS 2.0: Validate WPS attributes in management frames and WSC messages
If CONFIG_WPS_STRICT is set, validate WPS IE(s) in management frames and
reject the frames if any of the mandatory attributes is missing or if an
included attribute uses an invalid value. In addition, verify that all
mandatory attributes are included and have valid values in the WSC
messages.
2010-09-09 06:07:48 -07:00
Masashi Honma
509a39727f WPS: Fix unused variable warning
The wpa_supplicant compilation without CONFIG_WPS option results in
messages below.

scan.c: In function 'wpa_supplicant_scan':
scan.c:246: warning: unused variable 'wps'

This trivial patch erases this warning.
2010-08-20 09:44:50 +03:00
Jouni Malinen
24f7694062 Remove get-first-scan-results-before-request optimization
This has already been disabled in most use cases and can result
in problems with some drivers, so better just remove it completely.
2010-07-18 16:11:03 -07:00
Jouni Malinen
4436274bef SME: Do not skip initial scan request
When SME is in wpa_supplicant (mac80211), we need to make sure that
the kernel code has valid BSS entry for the AP. In some cases it
seemed to be possible to end up not having current information in
cfg80211 or mac80211 which can result to association failures. Avoid
this by always running through the scan request before initial
connection attempt.
2010-07-17 20:28:22 -07:00
Jouni Malinen
41e650ae5c WPS: Use different scan result sorting rules when doing WPS provisioning
The AP configuration may change after provisioning, so it is better
not to use the current security policy to prioritize results. Instead,
use WPS Selected Registrar attribute as the main sorting key and use
signal strength next without considering security policy or rate sets.
The non-WPS provisioning case remains as-is, i.e., this change applies
only when trying to find an AP for WPS provisioning.
2010-06-11 13:50:13 -07:00
Jouni Malinen
d902a9c1bc Fix scan_runs counting
Addition of the background scanning mechanism in commit
60b94c9819 moved the scan trigger
into a new function that was also incrementing the scan_runs
counter, but the removal of the previous scan_runs incrementation
was forgotten from that patch. This counter should only be updated
into a single location, so remove the old one. This improves AP
selection for WPS provisioning by not skipping some of the initial
scans.
2010-06-11 11:15:16 -07:00
Jouni Malinen
8401a6b028 Add Linux rfkill support
Add a new wpa_supplicant state: interface disabled. This can be used
to allow wpa_supplicant to be running with the network interface even
when the driver does not actually allow any radio operations (e.g.,
due to rfkill).

Allow driver_nl80211.c and driver_wext.c to start while rfkill is in
blocked state (i.e., when ifconfig up fails) and process rfkill
events to block/unblock WLAN.
2010-05-23 10:27:32 +03:00
Jouni Malinen
1c4c9c5078 Try to start a new scan more quickly after driver rejection
This speeds up recovery from some cases where the driver may refuse
a new scan request command temporarily.
2010-04-11 19:56:23 +03:00
Jouni Malinen
8cd82735cb Add an option to request a connection without a new scan 2010-04-11 19:55:40 +03:00
Jouni Malinen
17a4734dc4 Optimize post-WPS scan based on channel used during provisioning
Scan only the frequency that was used during provisioning during the
first five scans for the connection. This speeds up connection in the
most likely case where the AP remains on the same channel. If the AP is
not found after these initial scans, all channels will be scanned.
2010-04-11 19:06:42 +03:00
Jouni Malinen
3812464cda Add optional scan result filter based on SSID
filter_ssids=1 global configuration parameter can now be used to
enable scan result filtering (with -Dnl80211 only for now) based on
the configured SSIDs. In other words, only the scan results that have
an SSID matching with one of the configured networks are included in the
BSS table. This can be used to reduce memory needs in environments that
have huge number of APs.
2010-03-05 21:42:06 +02:00
Jouni Malinen
207ef3fb12 Add suspend/resume notifications
wpa_supplicant can now be notified of suspend/resume events, e.g.,
from pm-action scripts. This allows wpa_supplicant to clear information
that may become invalid during a suspend operation.
2010-02-27 18:46:02 +02:00
Jouni Malinen
d1f9c410c1 Remove src/drivers/scan_helpers.c
Most of this file was already moved into wpa_supplicant/scan.c and
we can remove the file completely by having couple of small helper
functions copied to the remaining users outside core wpa_supplicant
code.
2010-01-03 20:27:32 +02:00
Jouni Malinen
9ba9fa07cc Move wpa_supplicant specific scan code away from src/drivers
This fits better in wpa_supplicant/scan.c. Couple of remaining
scan_helpers.c functions are currently used in driver wrappers,
but they can likely be removed in the future.
2010-01-03 18:48:11 +02:00
Jouni Malinen
d009a9dac6 Add scan parameter support for client MLME 2009-12-28 13:34:03 +02:00
Jouni Malinen
c2e8d0a092 Remove deprecated scan and set_probe_req_ie driver_ops
These have been replaced with scan2 driver_ops that provides all
parameters in a single call.
2009-11-23 21:13:46 +02:00
Jouni Malinen
5be45e2e6e Fix per-SSID scan (scan_ssid=1)
Commit d3a9822542 broke per-SSID scan
by using the ssid variable for internal loop and by doing so,
overriding the value that was needed below to figure out whether the
scan is for a specific SSID. Fix this by using a temporary variable
instead when looping over network finding which frequencies to scan for.
2009-11-10 18:00:57 +02:00
Jouni Malinen
e6c0ebff68 Fix int_array_concat() to bail out on realloc failure
The previous version could have ended up dereferencing a NULL pointer
if the reallocation call were to fail.
2009-11-02 19:14:17 +02:00
Sam Leffler
4f34d51abe Do not schedule a new scan if no networks are enabled
This avoids an extra timeout to move to INACTIVE state.
2009-10-14 22:05:58 +03:00
Jouni Malinen
60b94c9819 Add preliminary background scan and roaming module design
This allows background scanning and roaming decisions to be contained in
a single place based on a defined set of notification events which will
hopefully make it easier to experiment with roaming improvements. In
addition, this allows multiple intra-ESS roaming policies to be used
(each network configuration block can configure its own bgscan module).

The beacon loss and signal strength notifications are implemented for
the bgscan API, but the actual events are not yet available from the
driver.

The included sample bgscan module ("simple") is an example of what can
be done with the new bgscan mechanism. It requests periodic background
scans when the device remains associated with an ESS and has couple of
notes on what a more advanced bgscan module could do to optimize
background scanning and roaming. The periodic scans will cause the scan
result handler to pick a better AP if one becomes available. This bgscan
module can be taken into use by adding bgscan="simple" (or
bgscan="simple:<bgscan interval in seconds>") into the network
configuration block.
2009-09-15 00:08:24 +03:00
Samuel Ortiz
3180d7a208 Getting back to DISCONNECTED afer SCANNING
After transitioning from DISCONNECTED to SCANNING, we never go back
to DISCONNECTED even though scanning is done or failed.
We're thus stuck in SCANNING while scanning is actually done.
2009-09-14 17:25:03 +03:00
Jouni Malinen
8bac466b00 Add wpa_supplicant notification calls
This introduces a new mechanism for collecting notification calls into
a single place (notify.c). As a result of this, most of the
wpa_supplicant code does not need to know about dbus (etc. mechanisms
that could use the notifications). Some empty placeholder functions are
also added in preparation of new dbus code that needs more event
notifications.
2009-09-13 20:53:32 +03:00