linux-stable.git/net/wireless/core.h, branch linux-3.10.y

cfg80211: limit scan results cache size

2017-02-10T10:03:56+00:00

commit 9853a55ef1bb66d7411136046060bbfb69c714fa upstream.

It's possible to make scanning consume almost arbitrary amounts
of memory, e.g. by sending beacon frames with random BSSIDs at
high rates while somebody is scanning.

Limit the number of BSS table entries we're willing to cache to
1000, limiting maximum memory usage to maybe 4-5MB, but lower
in practice - that would be the case for having both full-sized
beacon and probe response frames for each entry; this seems not
possible in practice, so a limit of 1000 entries will likely be
closer to 0.5 MB.

Signed-off-by: Johannes Berg 
Signed-off-by: Willy Tarreau

cfg80211: introduce critical protocol indication from user-space

2013-04-22T13:48:00+00:00

Some protocols need a more reliable connection to complete
successful in reasonable time. This patch adds a user-space
API to indicate the wireless driver that a critical protocol
is about to commence and when it is done, using nl80211 primitives
NL80211_CMD_CRIT_PROTOCOL_START and NL80211_CRIT_PROTOCOL_STOP.

There can be only on critical protocol session started per
registered cfg80211 device.

The driver can support this by implementing the cfg80211 callbacks
.crit_proto_start() and .crit_proto_stop(). Examples of protocols
that can benefit from this are DHCP, EAPOL, APIPA. Exactly how the
link can/should be made more reliable is up to the driver. Things
to consider are avoid scanning, no multi-channel operations, and
alter coexistence schemes.

Reviewed-by: Pieter-Paul Giesberts 
Reviewed-by: Franky (Zhenhui) Lin 
Signed-off-by: Arend van Spriel 
Signed-off-by: Johannes Berg

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless

2013-03-29T20:41:36+00:00

Conflicts:
	net/mac80211/sta_info.c
	net/wireless/core.h

cfg80211: always check for scan end on P2P device

2013-03-24T10:15:58+00:00

If a P2P device wdev is removed while it has a scan, then the
scan completion might crash later as it is already freed by
that time. To avoid the crash always check the scan completion
when the P2P device is being removed for some reason. If the
driver already canceled it, don't want and free it, otherwise
warn and leak it to avoid later crashes.

In order to do this, locking needs to be changed away from the
rdev mutex (which can't always be guaranteed). For now, use
the sched_scan_mtx instead, I'll rename it to just scan_mtx in
a later patch.

Signed-off-by: Johannes Berg

cfg80211/mac80211: disconnect on suspend

2013-03-06T15:35:55+00:00

If possible that after suspend, cfg80211 will receive request to
disconnect what require action on interface that was removed during
suspend.

Problem can manifest itself by various warnings similar to below one:

WARNING: at net/mac80211/driver-ops.h:12 ieee80211_bss_info_change_notify+0x2f9/0x300 [mac80211]()
wlan0:  Failed check-sdata-in-driver check, flags: 0x4
Call Trace:
 [] warn_slowpath_fmt+0x33/0x40
 [] ieee80211_bss_info_change_notify+0x2f9/0x300 [mac80211]
 [] ieee80211_recalc_ps_vif+0x2a/0x30 [mac80211]
 [] ieee80211_set_disassoc+0xf6/0x500 [mac80211]
 [] ieee80211_mgd_deauth+0x1f1/0x280 [mac80211]
 [] ieee80211_deauth+0x16/0x20 [mac80211]
 [] cfg80211_mlme_down+0x70/0xc0 [cfg80211]
 [] __cfg80211_disconnect+0x1b1/0x1d0 [cfg80211]

To fix the problem disconnect from any associated network before
suspend. User space is responsible to establish connection again
after resume. This basically need to be done by user space anyway,
because associated stations can go away during suspend (for example
NetworkManager disconnects on suspend and connect on resume by default).

Patch also handle situation when driver refuse to suspend with wowlan
configured and try to suspend again without it.

Signed-off-by: Stanislaw Gruszka 
Signed-off-by: Johannes Berg

cfg80211: refactor association parameters

2013-03-06T15:35:49+00:00

cfg80211_mlme_assoc() has grown far too many arguments,
make the caller build almost all of the driver struct
and pass that to the function instead.

Signed-off-by: Johannes Berg

cfg80211: add ability to override VHT capabilities

2013-03-06T15:35:47+00:00

For testing it's sometimes useful to be able to
override certain VHT capability advertisement,
add the ability to do that in cfg80211.

Signed-off-by: Johannes Berg

nl80211/cfg80211: add radar detection command/event

2013-02-15T08:40:18+00:00

Add new NL80211_CMD_RADAR_DETECT, which starts the Channel
Availability Check (CAC). This command will also notify the
usermode about events (CAC finished, CAC aborted, radar
detected, NOP finished).
Once radar detection has started it should continuously
monitor for radars as long as the channel is active.

This patch enables DFS for AP mode in nl80211/cfg80211.

Based on original patch by Victor Goldenshtein 

Signed-off-by: Simon Wunderlich 
[remove WIPHY_FLAG_HAS_RADAR_DETECT again -- my mistake]
Signed-off-by: Johannes Berg

cfg80211: configuration for WoWLAN over TCP

2013-02-13T13:33:42+00:00

Intel Wireless devices are able to make a TCP connection
after suspending, sending some data and waking up when
the connection receives wakeup data (or breaks). Add the
WoWLAN configuration and feature advertising API for it.

Acked-by: David S. Miller 
Signed-off-by: Johannes Berg

cfg80211: track hidden SSID networks properly

2013-02-11T17:44:57+00:00

Currently, cfg80211 will copy beacon IEs from a previously
received hidden SSID beacon to a probe response entry, if
that entry is created after the beacon entry. However, if
it is the other way around, or if the beacon is updated,
such changes aren't propagated.

Fix this by tracking the relation between the probe
response and beacon BSS structs in this case.

In case drivers have private data stored in a BSS struct
and need access to such data from a beacon entry, cfg80211
now provides the hidden_beacon_bss pointer from the probe
response entry to the beacon entry.

Signed-off-by: Johannes Berg