Implement the signature mechanism described in the paper
"Passive Taxonomy of Wifi Clients using MLME Frame Contents"
published by Denton Gentry and Avery Pennarun.
http://research.google.com/pubs/pub45429.htmlhttps://arxiv.org/abs/1608.01725
This involves:
1. Add a CONFIG_TAXONOMY compile option. Enabling taxonomy incurs
a memory overhead of up to several kilobytes per associated
station.
2. If enabled, store the Probe Request and (Re)Associate Request frame in
struct sta_info.
3. Implement code to extract the ID of each Information Element,
plus selected fields and bitmasks from certain IEs, into a
descriptive text string. This is done in a new source file,
src/ap/taxonomy.c.
4. Implement a "signature qq:rr:ss:tt:uu:vv" command
in hostapd_cli to retrieve the signature.
Signatures take the form of a text string. For example, a signature
for the Nexus 5X is:
wifi4|probe:0,1,127,45,191,htcap:01ef,htagg:03,htmcs:0000ffff,vhtcap:338061b2,
vhtrxmcs:030cfffa,vhttxmcs:030cfffa,extcap:00000a0201000040|assoc:0,1,48,45,
221(0050f2,2),191,127,htcap:01ef,htagg:03,htmcs:0000ffff,vhtcap:339071b2,
vhtrxmcs:030cfffa,vhttxmcs:030cfffa,extcap:0000000000000040
Signed-off-by: dgentry@google.com (Denton Gentry)
Signed-off-by: denny@geekhold.com (Denton Gentry)
Signed-off-by: rofrankel@google.com (Richard Frankel)
Signed-off-by: richard@frankel.tv (Richard Frankel)
Some deployed stations incorrectly consider nsts capability in
(Re)Association Response frame as required capability instead of maximum
capability and if it is greater than station's capability then beamform
will not happen in uplink traffic.
This commit adds support for an optional workaround to use station's
nsts capability in (Re)Association Response frame if the station's nsts
is less than AP by using the use_sta_nsts=1 configuration parameter.
This configuration is introduced in this commit and it is disabled by
default.
Signed-off-by: Tamizh chelvam <c_traja@qti.qualcomm.com>
Extend the radio_measurements parameter to save all the supported
RRM capabilities as it's used in RM enabled capabilities element.
Make this parameter not directly configurable via config file (though,
keep the radio_measurements parameter for some time for backwards
compatibility). Instead, add a configuration option to enable neighbor
report via radio measurements. Other features can be added later as
well.
Signed-off-by: David Spinadel <david.spinadel@intel.com>
This struct in the union is empty, but the design of using a zero-length
u8 array here is not fully compatible with C++ and can result in
undesired compiler warnings. Since there are no non-IE fields in the
Probe Request frames, get the location of the variable length IEs simply
by using the pointer to the frame header and the known header length.
Signed-off-by: Jouni Malinen <j@w1.fi>
Add MBO IE with AP capability attribute to Beacon, Probe Response, and
(Re)Association Response frames to indicate the AP supports MBO.
Add option to add Association Disallowed attribute to Beacon, Probe
Response, and (Re)Association Response frames. Usage:
SET mbo_assoc_disallow <reason code>
Valid reason code values are between 1-5. Setting the reason code to
0 will remove the Association Disallowed attribute from the MBO IE
and will allow new associations.
MBO functionality is enabled by setting "mbo=1" in the config file.
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
PBSS (Personal Basic Service Set) is a new BSS type for DMG
networks. It is similar to infrastructure BSS, having an AP-like
entity called PCP (PBSS Control Point), but it has few differences.
PBSS support is mandatory for IEEE 802.11ad devices.
Add a new "pbss" argument to network block. The argument is used
in the following scenarios:
1. When network has mode=2 (AP), when pbss flag is set will start
as a PCP instead of an AP.
2. When network has mode=0 (station), when pbss flag is set will
connect to PCP instead of AP.
The function wpa_scan_res_match() was modified to match BSS according to
the pbss flag in the network block (wpa_ssid structure). When pbss flag
is set it will match only PCPs, and when it is clear it will match only
APs.
Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
If P2P support is included in wpa_supplicant build (CONFIG_P2P=y), but
P2P functionality is explicitly disabled (e.g., "P2P_SET disabled 1"),
couple of AP management frame processing steps did not check against
hapd->p2p_group being NULL and could end up dereferencing a NULL pointer
if a Probe Request frame or (Re)Association Request frame was received
with a P2P IE in it. Fix this by skipping these steps if hapd->p2p_group
is NULL.
Signed-off-by: Jouni Malinen <j@w1.fi>
Reorder terms in a way that no invalid pointers are generated with
pos+len operations. end-pos is always defined (with a valid pos pointer)
while pos+len could end up pointing beyond the end pointer which would
be undefined behavior.
Signed-off-by: Jouni Malinen <j@w1.fi>
The new hostapd configuration parameter no_probe_resp_if_max_sta=1 can
be used to request hostapd not to reply to broadcast Probe Request
frames from unassociated STA if there is no room for additional stations
(max_num_sta). This can be used to discourage a STA from trying to
associate with this AP if the association would be rejected due to
maximum STA limit.
Signed-off-by: Jouni Malinen <j@w1.fi>
Some APs don't include a CSA IE when an ECSA IE is generated,
and mac80211 used to fail following their channel switch. Add
a testing option to hostapd to allow reproducing the behavior.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Pass to the driver a list of CSA counter offsets when sending Probe
Response frames during a CSA period. This allows the kernel to correctly
update the CSA/eCSA elements.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Advertise current operating class in Beacon and Probe Response frames.
This Supported Operating Classes element is required by the standard
when extended channel switch is supported. However, since this element
doesn't reflect correctly the sub-band spectrum breakdown and can't be
effectively used by clients, publish only the minimal required part
which is the current operating class.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Fix the order of CSA, eCSA, Secondary Channel Offset, and Wide Bandwidth
Channel Switch Wrapper elements in Beacon and Probe Response frames.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Extended channel switch provides an ability to switch between operating
classes and is required for P2P Devices by the P2P specification when
switching in 5 GHz.
When the operating class is provided for channel switch, the AP/P2P GO
will use eCSA IE in addition to the regular CSA IE both on 2.4 GHz and 5
GHz bands.
Transitions between different hw_modes are not supported.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
When switching to a VHT channel with width greater than 20 MHz, add Wide
Bandwidth Channel Switch element. This element is added in Beacon and
Probe Response frames inside Channel Switch Wrapper element.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
When CSA is started, hostapd_change_config_freq() computes the channel
from the provided frequency. Use this stored channel to add CSA IE in
Beacon frames, instead of recomputing the channel each time.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This extends the previous tracking design to add a station entry based
on other management frames than Probe Request frames. For example, this
covers a case where the station is using passive scanning.
Signed-off-by: Jouni Malinen <j@w1.fi>
The new no_auth_if_seen_on=<ifname> parameter can now be used to
configure hostapd to reject authentication from a station that was seen
on another radio.
This can be used with enabled track_sta_max_num configuration on another
interface controlled by the same hostapd process to reject
authentication attempts from a station that has been detected to be
capable of operating on another band, e.g., to try to reduce likelihood
of the station selecting a 2.4 GHz BSS when the AP operates both a 2.4
GHz and 5 GHz BSS concurrently.
Note: Enabling this can cause connectivity issues and increase latency for
connecting with the AP.
Signed-off-by: Jouni Malinen <j@w1.fi>
The new no_probe_resp_if_seen_on=<ifname> parameter can now be used to
configure hostapd to not reply to group-addressed Probe Request from a
station that was seen on another radio.
This can be used with enabled track_sta_max_num configuration on another
interface controlled by the same hostapd process to restrict Probe
Request frame handling from replying to group-addressed Probe Request
frames from a station that has been detected to be capable of operating
on another band, e.g., to try to reduce likelihood of the station
selecting a 2.4 GHz BSS when the AP operates both a 2.4 GHz and 5 GHz
BSS concurrently.
Note: Enabling this can cause connectivity issues and increase latency
for discovering the AP.
Signed-off-by: Jouni Malinen <j@w1.fi>
hostapd can now be configured to track unconnected stations based on
Probe Request frames seen from them. This can be used, e.g., to detect
dualband capable station before they have associated. Such information
could then be used to provide guidance on which colocated BSS to use in
case of a dualband AP that operates concurrently on multiple bands under
the control of a single hostapd process.
Signed-off-by: Jouni Malinen <j@w1.fi>
This adds the FST IEs received from the FST module into Beacon, Probe
Response, and (Re)Association Response frames.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Commit 95b6bca66d ('Add rsn_pairwise bits
to set_ieee8021x() driver_ops') modified cipher configuration to use
unconditionally wpa_pairwise | rsn_pairwise. While that works for many
cases, it does not handle the case of dynamic configuration changes over
the control interface where wpa_pairwise or rsn_pairwise values may not
get cleared when the wpa parameter is modified. Fix this inconsistency
by configuring the driver with only the bits that are valid for the
currently enabled WPA/WPA2 version(s).
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Check the element length in the parser and remove the length field from
struct ieee802_11_elems since the only allowed element length is one.
Signed-off-by: Jouni Malinen <j@w1.fi>
The multi-SSID design that used a single beaconing BSSID with multiple
SSIDs was never completed in this repository, so there is no need to
maintain the per-STA ssid/ssid_probe pointers that could only point to
&hapd->conf->ssid. Save some memory and reduce code complexity by
removing this unused partial capability.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Read p2p_go_ctwindow (0-127 TUs) from the config file, and pass it to
the driver on GO start.
Use p2p_go_ctwindow=0 (no CTWindow) by default.
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
This is a step towards enabling hostapd to restart AP mode functionality
if the interface is disabled and re-enabled, e.g., with ifconfig down
and up. This commit takes care of beaconining only which may be
sufficient for open mode connection, but not for WPA2 cases.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Do not reply to a Probe Request frame with a DSSS Parameter Set element
in which the channel is different than the operating channel of the AP,
as the sending station is not found on the AP's operating channel.
IEEE Std 802.11-2012 describes this as a requirement for an AP with
dot11RadioMeasurementActivated set to true, but strictly speaking does
not allow such ignoring of Probe Request frames if
dot11RadioMeasurementActivated is false. Anyway, this can help reduce
number of unnecessary Probe Response frames for cases where the STA is
less likely to see them (Probe Request frame sent on a neighboring, but
partially overlapping, channel).
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
This allows vendor specific information element to be used to advertise
support for VHT on 2.4 GHz band. In practice, this is used to enable use
of 256 QAM rates (VHT-MCS 8 and 9) on 2.4 GHz band.
This functionality is disabled by default, but can be enabled with
vendor_vht=1 parameter in hostapd.conf if the driver advertises support
for VHT on either 2.4 or 5 GHz bands.
Signed-off-by: Yanbo Li <yanbol@qti.qualcomm.com>
The new hostapd.conf radio_measurements parameter can now be used to
configure a test build to advertise support for radio measurements with
neighbor report enabled. There is no real functionality that would
actually process the request, i.e., this only for the purpose of minimal
STA side testing for now.
Signed-off-by: Jouni Malinen <j@w1.fi>
The new "bss_load_update_period" parameter can be used to configure
hostapd to advertise its BSS Load element in Beacon and Probe Response
frames. This parameter is in the units of BUs (Beacon Units).
When enabled, the STA Count and the Channel Utilization value will be
updated periodically in the BSS Load element. The AAC is set to 0 sinze
explicit admission control is not supported. Channel Utilization is
calculated based on the channel survey information from the driver and
as such, requires a driver that supports providing that information for
the current operating channel.
Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
This fixes couple of code paths where the WPA_DRIVER_FLAGS_DFS_OFFLOAD
flag was not checked properly and unexpected DFS operations were
initiated (and failed) in case the driver handles all these steps.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
prev cannot be NULL here in the hostapd_eid_country_add() call since
prev is set whenever start becomes non-NULL. That seems to be a bit too
difficult for some static analyzers, so check the prev pointer
explicitly to avoid false warnings.
Signed-off-by: Jouni Malinen <j@w1.fi>
This fixes an issue where a driver using the deprecated set_ieee8021x()
callback did not include rsn_pairwise bits in the driver configuration
even if mixed WPA+WPA2 configuration was used. This could result, e.g.,
in CCMP not being enabled properly when wpa_pairwise=TKIP and
rsn_pairwise=CCMP was used in the configuration. Fix this by using
bitwise OR of the wpa_pairwise and rsn_pairwise values to allow the
driver to enable all pairwise ciphers.
In addition, make the newer set_ap() driver_ops use the same bitwise OR
design instead of picking between rsn_pairwise and wpa_pairwise. This
makes the code paths consistent and can also fix issues with mixed mode
configuration with set_ap().
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
clang scan-build does not seem to like the 'd' suffix on floating
constants and ends up reporting analyzer failures. Since this suffix
does not seem to be needed, get rid of it to clear such warnings.
Signed-off-by: Jouni Malinen <j@w1.fi>
This provides information to allow the driver to be configured for
updated channel parameters, e.g., when dynamically changing HT20/HT40
bandwidth.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
With hidden SSID (ignore_broadcast_ssid), an IOS device trying to
connect to the AP will send a probe request with ANT == 2. If
interworking support is just compiled (not enabled), we will drop the
probe request since default ANT is 0.
Check that interworking is enabled before filtering based on ANT or
HESSID to match the behavior of code without CONFIG_INTERWORKING.
Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Add configuration of Spectrum Management subfield in the Capability
Information of Beacon, Probe Response, and Association Response frames.
Spectrum Management bit is set when directly requested by new
configuration option spectrum_mgmt_required=1 or when AP is running on
DFS channels. In the future, also TPC shall require this bit to be set.
Signed-hostap: Srinivasan <srinivasanb@posedge.com>
Signed-hostap: Chaitanya T K <chaitanyatk@posedge.com>
Signed-hostap: Marek Puzyniak <marek.puzyniak@tieto.com>
Add Power Constraint information element to Beacon and Probe Response
frames when hostapd is configured on 5 GHz band and Country information
element is also added. According to IEEE Std 802.11-2012 a STA shall
determine a local maximum transmit power for the current channel based
on information derived from Country and Power Constraint elements.
In order to add Power Constraint element ieee80211d option need to be
enabled and new local_pwr_constraint config option need to be set to
unsigned value in units of decibels. For now this value is statically
configured but the future goal is to implement dynamic TPC algorithm
to control local power constraint.
Signed-hostap: Srinivasan <srinivasanb@posedge.com>
Signed-hostap: Chaitanya T K <chaitanyatk@posedge.com>
Signed-hostap: Marek Puzyniak <marek.puzyniak@tieto.com>
These files have been distributed only under the BSD license option
since February 2012. Clarify the license statements in the files to
match that to avoid confusion.
Signed-hostap: Jouni Malinen <j@w1.fi>
If secondary channel is provided for CSA, advertise it in the Secondary
Channel Offset element in Beacon and Probe Response frames.
Signed-hostap: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
When CSA flow starts, store the entire struct hostapd_freq_params and
not only CS frequency as it was before. The additional freq_params are
required to advertise CS supplementary IEs such as secondary channel,
wide bandwidth CS, etc.
Signed-hostap: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This allows use of structs (and not only pointers) defined in drivers.h.
Remove also some not needed forward declarations and redundant includes.
Signed-hostap: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Check if the BSS interface has started before setting beacon.
Lack of this condition can cause segmantation fault.
Signed-hostap: Marek Kwaczynski <marek.kwaczynski@tieto.com>
Build CSA settings and call the driver to perform the switch. Construct
Beacon, Probe Response, and (Re)Association Response frames both for CSA
period and for the new channel. These frames are built based on the
current configuration. Add CSA IE in Beacon and Probe Response frames.
Signed-hostap: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
The new bss_load_test parameter can be used to configure hostapd to
advertise a fixed BSS Load element in Beacon and Probe Response frames
for testing purposes. This functionality is disabled in the build by
default and can be enabled with CONFIG_TESTING_OPTIONS=y.
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
If AP mode SME/MLME within wpa_supplicant is used for processing Probe
Request frames in GO mode, drop Probe Request frames that include only
802.11b rates per P2P spec section 2.4.1.
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
In order to test clients in scenarios where APs may (randomly)
drop certain management frames, introduce some testing options
into the hostapd configuration that can make it ignore certain
frames. For now, these are probe requests, authentication and
(re)association frames.
Signed-hostap: Johannes Berg <johannes.berg@intel.com>
This allows Probe Request frame processing to compare the configured
SSID to the SSID List element in addition to the SSID element.
Signed-hostap: Jouni Malinen <j@w1.fi>
The conf doesn't contain any basic rates in some cases. Most notably,
when starting a P2P GO in 5 GHz. Use the iface rates which are
initialized in hostapd_prepare_rates() to the conf rates or set to
default values if no conf values exist. This fixes a bug introduced in
commit e5693c4775.
Signed-hostap: Arik Nemtsov <arik@wizery.com>
The new vendor_elements parameter in hostapd.conf can be used to add new
vendor specific element(s) into Beacon and Probe Response frames.
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
disable_dgaf=1 in hostapd.conf can now be used to disable downstream
group-addressed forwarding (DGAF). In this configuration, a unique
GTK (and IGTK) is provided to each STA in the BSS to make sure the
keys do not match and no STA can forge group-addressed frames.
An additional mechanism in the AP needs to be provided to handle some
group-addressed frames, e.g., by converting DHCP packets to unicast
IEEE 802.11 frames regardless of their destination IP address and by
providing Proxy ARP functionality.
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
The signal strength is currently never used as the only driver reporting
it is nl80211 which uses IEEE80211_RADIOTAP_DB_ANTSIGNAL which is never
populated by the kernel. The kernel will (soon) populate
IEEE80211_RADIOTAP_DBM_ANTSIGNAL instead though, so use that.
Also, since it was never really populated, we can redefine the signal
field to be in dBm units only.
My next patch will also require knowing the signal strength of probe
requests throughout the code (where available), so add it to the
necessary APIs.
Signed-hostap: Johannes Berg <johannes.berg@intel.com>
When hostapd is about to start an AP using HT40, it starts a scan to
check whether it is allowed or not. If OLBC is detected before the
scan has completed, it sets the beacons prematurely.
To fix this, instead of setting all beacons when OLBC is detected,
only update the ones that have already been started.
Signed-off-by: Luciano Coelho <coelho@ti.com>
When drivers advertise their capability to free up inactive
stations based on ap_max_inactivity, send the inactivity period
timeout to driver in NL80211_ATTR_INACTIVITY_TIMEOUT. This
introduces a WPA_DRIVER_FLAGS (WPA_DRIVER_FLAGS_INACTIVITY_TIMER)
so that the inactivity period will be sent only when this capability
bit is set.
Signed-hostap: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
The Device ID attribute was already used in Listen state, but it was
ignored in GO role. Verify that there is a match with Device ID in
GO rule, too, before replying to the Probe Request frame.
Signed-hostap: Jouni Malinen <j@w1.fi>
Configure a Probe Response template for drivers that support it. The
template is updated when the Beacon template is updated.
The Probe Response template is propagated to the driver via the set_ap()
callback.
Signed-hostap: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
This is needed for Probe Response template, so move the code into a
separate function that can be shared.
Signed-hostap: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Some client implementations only wait a few ms after sending a probe
request while scanning. Since probe responses are always sent at a low
rate this can eat quite some airtime and it might be impossible to get
the frame out before the client leaves the channel again. If the client
leaves before all probe reponses where acked this can cause the probe
reponse to be retried quite often consuming even more airtime.
Hence, add a new noack flag to the driver's send_mlme callback that
allows hostapd to request whether the driver should expect an ACK for
this frame or not.
Use the new noack-policy only for broadcast probe requests that contain
a wildcard SSID.
Signed-hostap: Helmut Schaa <helmut.schaa@googlemail.com>
In some situations it might be benefical to send a unicast frame without
the need for getting it ACKed (probe responses for example). In order to
achieve this add a new noack parameter to the drivers send_mlme callback
that can be used to advise the driver to not wait for an ACK for this
frame.
Signed-hostap: Helmut Schaa <helmut.schaa@googlemail.com>
This was included in the AP configuration parameters, but there has
been no way to set it to anything else than the default automatic
mode. Remove this parameter and just hardcode ERP determination to
follow the automatic mode.
Remove the separate driver_ops functions set_cts_protect(),
set_preamble(), set_short_slot_time(), and set_ht_params(). These
belong into same set of operations as set_ap(), so there is no need
to maintain separate functions that just make the driver wrapper
more complex.
Since these have only been used with driver_nl80211.c, the driver_ops
can be removed immediately instead of maintaining backwards
compatibility period with the old functions.
The AP client isolation parameter is now available through set_ap().
driver_nl80211.c was the only driver wrapper using the set_intra_bss()
call in hostap.git, but some external trees may have used this. Once
those are cleared, the set_infra_bss() driver_ops can be removed
completely. The only remaining use case for it currently is in P2P
GO mode with wpa_supplicant.
AP mode operations were used for P2P device discovery Listen state
only during early experiments. This has now been cleaned up and
ieee802_11_set_beacon() is not called for P2P device discovery.
As such, this hack to skip Beacon configuration can be removed.
This change is a first step in better supporting different driver
architectures for AP mode operations with nl80211. This commit in
itself does not add new functionality, but it makes it easier to add
new AP mode parameters to address needs of drivers that have more of
the MLME/SME in firmware or kernel.
This avoids a request to the driver to first start beaconing before
the WPA/RSN IE has been generated and then immediately changing the
beacon IEs once the WPA/RSN IE is ready.
Only accept Probe Request frames that have a Wildcard BSSID and a
destination address that matches with our P2P Device Address or is the
broadcast address per P2P specification 3.1.2.1.1.
tdls_prohibit=1 and tdls_prohibit_chan_switch=1 and now be used to
disable use of TDLS or TDLS channel switching in the BSS using
extended cabilities IE as defined in IEEE 802.11z.
Make sure that received management frames are long enough before
processing them. This avoids a potential segmentation fault if a
driver delivers an invalid frame all the way to hostapd.
This is not needed anymore and just makes things more difficult
to understand, so move the remaining function pointers to direct
function calls and get rid of the struct hostapd_driver_ops.
send_eapol, set_key, read_sta_data, sta_clear_stats,
set_radius_acl_auth, set_radius_acl_expire, and set_beacon
to use inline functions instead of extra abstraction.
Commit bf65bc638f started the path to
add this new abstraction for driver operations in AP mode to allow
wpa_supplicant to control AP mode operations. At that point, the
extra abstraction was needed, but it is not needed anymore since
hostapd and wpa_supplicant share the same struct wpa_driver_ops.
Start removing the unneeded abstraction by converting
send_mgmt_frame() to an inline function, hostapd_drv_send_mlme().
This is similar to the design that is used in wpa_supplicant and
that was used in hostapd in the past (hostapd_send_mgmt_frame()
inline function).
