Reject NL80211_CMD_DISCONNECT, NL80211_CMD_DISASSOCIATE,
NL80211_CMD_DEAUTHENTICATE and NL80211_CMD_ASSOCIATE commands
from clients other than the connection owner set in the connect,
authenticate or associate commands, if it was set.

The main point of this check is to prevent chaos when two processes
try to use nl80211 at the same time, it's not a security measure.
The same thing should possibly be done for JOIN_IBSS/LEAVE_IBSS and
START_AP/STOP_AP.
Signed-off-by: NAndrew Zaborowski <andrew.zaborowski@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Use NL80211_CMD_UPDATE_CONNECT_PARAMS to update new ERP information,
Association IEs and the Authentication type to driver / firmware which
will be used in subsequent roamings.
Signed-off-by: NVidyullatha Kanchanapally <vidyullatha@codeaurora.org>
[arend: extended fils-sk kernel doc and added check in wiphy_register()]
Reviewed-by: NJithu Jance <jithu.jance@broadcom.com>
Reviewed-by: NEylon Pedinovsky <eylon.pedinovsky@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

In case of FILS shared key offload the parameters can change
upon roaming of which user-space needs to be notified.
Reviewed-by: NJithu Jance <jithu.jance@broadcom.com>
Reviewed-by: NEylon Pedinovsky <eylon.pedinovsky@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Put FILS related parameters into their own struct definition so
it can be reused for roam events in subsequent change.
Reviewed-by: NJithu Jance <jithu.jance@broadcom.com>
Reviewed-by: NEylon Pedinovsky <eylon.pedinovsky@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Only invoke cfg80211_bss_expire on the first nl80211_dump_scan
invocation to avoid (likely) redundant processing.
Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Commit 7ea3e110 seems to have
introduced:

net/wireless/nl80211.c: In function ‘nl80211_get_station’:
net/wireless/nl80211.c:4802:34: error: incompatible type for argument 1 of ‘cfg80211_sinfo_release_content’
   cfg80211_sinfo_release_content(sinfo);
                                  ^~~~~
In file included from net/wireless/nl80211.c:24:0:
./include/net/cfg80211.h:5721:20: note: expected ‘struct station_info *’ but argument is of type ‘struct station_info’
 static inline void cfg80211_sinfo_release_content(struct station_info *sinfo)
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 7ea3e110 ("cfg80211: release station info tidstats where needed")
Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This fixes memory leaks in cases where we got the station
info but failed sending it out properly.

Fixes: 8689c051 ("cfg80211: dynamically allocate per-tid stats for station info")
Reviewed-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Arend's previous patch made the sinfo structure smaller
again by to dynamically allocating the per-tid stats
only when needed. Thus, revert to stack allocation for
the struct to simplify the code.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

With the addition of TXQ stats in the per-tid statistics the struct
station_info grew significantly. This resulted in stack size warnings
due to the structure itself being above the limit for the warnings.

Add an allocation function that those who want to provide per-tid
stats should use to allocate the tid array, i.e.
struct station_info::pertid.

Cc: Toke Høiland-Jørgensen <toke@toke.dk>
Fixes: 52539ca8 ("cfg80211: Expose TXQ stats and parameters to userspace")
Signed-off-by: NArend van Spriel <aspriel@gmail.com>
[johannes: fix missing BIT() and logic by removing]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This adds support for exporting the mac80211 TXQ stats via nl80211 by
way of a nested TXQ stats attribute, as well as for configuring the
quantum and limits that were previously only changeable through debugfs.

This commit adds just the nl80211 API, a subsequent commit adds support to
mac80211 itself.
Signed-off-by: NToke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Average ack rssi will be given to userspace via NL80211 interface
if firmware is capable. Userspace tool ‘iw’ can process this
information and give the output as one of the fields in
‘iw dev wlanX station dump’.

Example output :

localhost ~ #iw dev wlan-5000mhz station dump Station
34:f3:9a:aa:3b:29 (on wlan-5000mhz)
        inactive time:  5370 ms
        rx bytes:       85321
        rx packets:     576
        tx bytes:       14225
        tx packets:     71
        tx retries:     0
        tx failed:      2
        beacon loss:    0
        rx drop misc:   0
        signal:         -54 dBm
        signal avg:     -53 dBm
        tx bitrate:     866.7 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 2
        rx bitrate:     866.7 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 2
        avg ack signal: -56 dBm
        authorized:     yes
        authenticated:  yes
        associated:     yes
        preamble:       short
        WMM/WME:        yes
        MFP:            no
        TDLS peer:      no
        DTIM period:    2
        beacon interval:100
       short preamble: yes
       short slot time:yes
       connected time: 203 seconds

Main use case is to measure the signal strength of a connected station
to AP. Data packet transmit rates and bandwidth used by station can vary
a lot even if the station is at fixed location, especially if the rates
used are multi stream(2stream, 3stream) rates with different bandwidth(20/40/80 Mhz).
These multi stream rates are sensitive and station can use different transmit power
for each of the rate and bandwidth combinations. RSSI measured from these RX packets
on AP will be not stable and can vary a lot with in a short time.
Whereas 802.11 ack frames from station are sent relatively at a constant
rate (6/12/24 Mbps) with constant bandwidth(20 Mhz).
So average rssi of the ack packets is good and more accurate.
Signed-off-by: NBalaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This will serve userspace entity to maintain its regulatory limitation.
More specifcally APs can use this data to calculate the WMM IE when
building: beacons, probe responses, assoc responses etc...
Signed-off-by: NHaim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

The failure scenario while processing
NL80211_ATTR_EXTERNAL_AUTH_SUPPORT does not free
the connkeys. This commit addresses the same.
Signed-off-by: NSrinivas Dasari <dasaris@codeaurora.org>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This commit implements the TX side of NL80211_CMD_CONTROL_PORT_FRAME.
Userspace provides the raw EAPoL frame using NL80211_ATTR_FRAME.
Userspace should also provide the destination address and the protocol
type to use when sending the frame.  This is used to implement TX of
Pre-authentication frames.  If CONTROL_PORT_ETHERTYPE_NO_ENCRYPT is
specified, then the driver will be asked not to encrypt the outgoing
frame.

A new EXT_FEATURE flag is introduced so that nl80211 code can check
whether a given wiphy has capability to pass EAPoL frames over nl80211.
Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This commit also adds cfg80211_rx_control_port function.  This is used
to generate a CMD_CONTROL_PORT_FRAME event out to userspace.  The
conn_owner_nlportid is used as the unicast destination.  This means that
userspace must specify NL80211_ATTR_SOCKET_OWNER flag if control port
over nl80211 routing is requested in NL80211_CMD_CONNECT,
NL80211_CMD_ASSOCIATE, NL80211_CMD_START_AP or IBSS/mesh join.
Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
[johannes: fix return value of cfg80211_rx_control_port()]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
[johannes: fix race with wdev lock/unlock by just acquiring once]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Signed-off-by: NDenis Kenzior <denkenz@gmail.com>
[johannes: fix race with wdev lock/unlock by just acquiring once]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Add wiphy EXT_FEATURE flag to indicate that HW or driver does
all DFS actions by itself.
User-space functionality already implemented in hostapd using
vendor-specific (QCA) OUI to advertise DFS offload support.
Need to introduce generic flag to inform about DFS offload support.
For devices with DFS_OFFLOAD flag set user-space will no longer
need to issue CAC or do any actions in response to
"radar detected" events. HW will do everything by itself and send
events to user-space to indicate that CAC was started/finished, etc.
Signed-off-by: NDmitrii Lebed <dlebed@quantenna.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This patch provides support to get ack signal in probe client response
and in station info from user.
Signed-off-by: NVenkateswara Naralasetty <vnaralas@codeaurora.org>
[squash in compilation fixes]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Unfortunately removal of the ext_feature flag in the last revision of
the patch ended up negating the comparison and prevented the command
from being processed (either nl80211_external_auth() or
rdev_external_auth() returns -EOPNOTSUPP). Fix this by adding back the
lost '!'.

Fixes: 40cbfa90 ("cfg80211/nl80211: Optional authentication offload to userspace")
Signed-off-by: NSrinivas Dasari <dasaris@codeaurora.org>
Signed-off-by: NJouni Malinen <jouni@codeaurora.org>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

If we free the message immediately, there's no reason to
trim it back to the previous size.

Done with spatch:

@@
identifier msg, hdr;
@@
-if (hdr)
-  genlmsg_cancel(msg, hdr);
... when != msg;
 nlmsg_free(msg);

@@
identifier msg, hdr;
@@
-genlmsg_cancel(msg, hdr);
... when != msg;
 nlmsg_free(msg);
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

ht/vht action frames will be sent to AP from station to notify
change of its ht/vht opmode(max bandwidth, smps mode or nss) modified
values. Currently these valuse used by driver/firmware for rate control
algorithm. This patch introduces NL80211_CMD_STA_OPMODE_CHANGED
command to notify those modified/current supported values(max bandwidth,
smps mode, max nss) to userspace application. This will be useful for the
application like steering, which closely monitoring station's capability
changes. Since the application has taken these values during station
association.
Signed-off-by: NTamizh chelvam <tamizhr@codeaurora.org>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This commit allows SAE Authentication for NL80211_CMD_CONNECT
interface, provided host driver advertises the support.

Host drivers may offload the SAE authentication to user space
through NL80211_CMD_EXTERNAL_AUTH interface and thus expect
the user space to advertise support to handle offload through
NL80211_ATTR_EXTERNAL_AUTH_SUPPORT in NL80211_CMD_CONNECT
request. Such drivers should reject the connect request on no
offload support from user space.
Signed-off-by: NSrinivas Dasari <dasaris@qti.qualcomm.com>
Signed-off-by: NJouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This interface allows the host driver to offload the authentication to
user space. This is exclusively defined for host drivers that do not
define separate commands for authentication and association, but rely on
userspace SME (e.g., in wpa_supplicant for the ~WPA_DRIVER_FLAGS_SME
case) for the authentication to happen. This can be used to implement
SAE without full implementation in the kernel/firmware while still being
able to use NL80211_CMD_CONNECT with driver-based BSS selection.

Host driver sends NL80211_CMD_EXTERNAL_AUTH event to start/abort
authentication to the port on which connect is triggered and status
of authentication is further indicated by user space to host
driver through the same command response interface.

User space entities advertise this capability through the
NL80211_ATTR_EXTERNAL_AUTH_SUPP flag in the NL80211_CMD_CONNECT request.
Host drivers shall look at this capability to offload the authentication.
Signed-off-by: NSrinivas Dasari <dasaris@qti.qualcomm.com>
Signed-off-by: NJouni Malinen <jouni@qca.qualcomm.com>
[add socket connection ownership check]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This commit defines new scan flags (LOW_SPAN, LOW_POWER, HIGH_LATENCY)
to emphasize the requested scan behavior for the driver. These flags
are optional and are mutually exclusive. The implementation of the
respective functionality can be driver/hardware specific.

These flags can be used to control the compromise between how long
a scan takes, how much power it uses, and high accurate/complete
the scan is in finding the BSSs.
Signed-off-by: NSunil Dutt <usdutt@qti.qualcomm.com>
Signed-off-by: NJouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Wireless drivers rely on parse_txq_params to validate that txq_params->ac
is less than NL80211_NUM_ACS by the time the low-level driver's ->conf_tx()
handler is called. Use a new helper, array_index_nospec(), to sanitize
txq_params->ac with respect to speculation. I.e. ensure that any
speculation into ->conf_tx() handlers is done with a value of
txq_params->ac that is within the bounds of [0, NL80211_NUM_ACS).
Reported-by: NChristian Lamparter <chunkeey@gmail.com>
Reported-by: NElena Reshetova <elena.reshetova@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Cc: linux-arch@vger.kernel.org
Cc: kernel-hardening@lists.openwall.com
Cc: gregkh@linuxfoundation.org
Cc: linux-wireless@vger.kernel.org
Cc: torvalds@linux-foundation.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: alan@linux.intel.com
Link: https://lkml.kernel.org/r/151727419584.33451.7700736761686184303.stgit@dwillia2-desk3.amr.corp.intel.com

Fix two places where the structure isn't initialized to zero,
and thus can't be filled properly by the driver.

Fixes: 4a4b8169 ("cfg80211: Accept multiple RSSI thresholds for CQM")
Fixes: 9930380f ("cfg80211: implement IWRATE")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

As ieee80211_bss_get_ie() derefences an RCU to return ssid_ie, both
the call to this function and any operation on this variable need
protection by the RCU read lock.

Fixes: 44905265 ("nl80211: don't expose wdev->ssid for most interfaces")
Signed-off-by: NDominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

nl80211_nan_add_func() does not check if the required attribute
NL80211_NAN_FUNC_FOLLOW_UP_DEST is present when processing
NL80211_CMD_ADD_NAN_FUNCTION request. This request can be issued
by users with CAP_NET_ADMIN privilege and may result in NULL dereference
and a system crash. Add a check for the required attribute presence.
Signed-off-by: NHao Chen <flank3rsky@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This commit enhances the scan results to report the per chain signal
strength based on the latest BSS update. This provides similar
information to what is already available through STA information.
Signed-off-by: NSunil Dutt <usdutt@qti.qualcomm.com>
Signed-off-by: NJouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Send disconnection reason code to user space even if it's locally
generated, since some tests that check reason code may fail because of
the current behavior.
Signed-off-by: NDavid Spinadel <david.spinadel@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

Evidently I introduced a locking bug in my change here,
the nla_put_failure sometimes needs to unlock. Fix it.

Fixes: 44905265 ("nl80211: don't expose wdev->ssid for most interfaces")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

This mostly serves as an example for how to add error strings
and erroneous attribute pointers.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

For mesh, this is simply wrong - there's no SSID, only the
mesh ID, so don't expose it at all.
For (P2P) client, it's wrong, because it exposes an internal
value that's only used when certain APIs are used.
For AP, it's actually the only correct case, so leave that.
All other interface types shouldn't be setting this anyway,
so there it won't change anything.

Fixes: b84e7a05 ("nl80211: send the NL80211_ATTR_SSID in nl80211_send_iface()")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

According to the description, first argument of genlmsg_nlhdr() points to
what genlmsg_put() returns, i.e. beginning of user header. Therefore we
should only subtract size of genetlink header and netlink message header,
not user header.

This also means we don't need to pass the pointer to genetlink family and
the same is true for genl_dump_check_consistent() which is the only caller
of genlmsg_nlhdr(). (Note that at the moment, these functions are only
used for families which do not have user header so that they are not
affected.)

Fixes: 670dc283 ("netlink: advertise incomplete dumps")
Signed-off-by: NMichal Kubecek <mkubecek@suse.cz>
Reviewed-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()

Please do not apply this to mainline directly, instead please re-run the
coccinelle script shown below and apply its output.

For several reasons, it is desirable to use {READ,WRITE}_ONCE() in
preference to ACCESS_ONCE(), and new code is expected to use one of the
former. So far, there's been no reason to change most existing uses of
ACCESS_ONCE(), as these aren't harmful, and changing them results in
churn.

However, for some features, the read/write distinction is critical to
correct operation. To distinguish these cases, separate read/write
accessors must be used. This patch migrates (most) remaining
ACCESS_ONCE() instances to {READ,WRITE}_ONCE(), using the following
coccinelle script:

----
// Convert trivial ACCESS_ONCE() uses to equivalent READ_ONCE() and
// WRITE_ONCE()

// $ make coccicheck COCCI=/home/mark/once.cocci SPFLAGS="--include-headers" MODE=patch

virtual patch

@ depends on patch @
expression E1, E2;
@@

- ACCESS_ONCE(E1) = E2
+ WRITE_ONCE(E1, E2)

@ depends on patch @
expression E;
@@

- ACCESS_ONCE(E)
+ READ_ONCE(E)
----
Signed-off-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: davem@davemloft.net
Cc: linux-arch@vger.kernel.org
Cc: mpe@ellerman.id.au
Cc: shuah@kernel.org
Cc: snitzer@redhat.com
Cc: thor.thayer@linux.intel.com
Cc: tj@kernel.org
Cc: viro@zeniv.linux.org.uk
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1508792849-3115-19-git-send-email-paulmck@linux.vnet.ibm.comSigned-off-by: NIngo Molnar <mingo@kernel.org>