linux-stable.git/net/wireless/core.h, branch linux-3.11.y

cfg80211: separate internal SME implementation

2013-06-04T11:03:11+00:00

The current internal SME implementation in cfg80211 is
very mixed up with the MLME handling, which has been
causing issues for a long time. There are three things
that the implementation has to provide:
 * a basic SME implementation for nl80211's connect()
   call (for drivers implementing auth/assoc, which is
   really just mac80211) and wireless extensions
 * MLME events for the userspace SME
 * SME events (connected, disconnected etc.) for all
   different SME implementation possibilities (driver,
   cfg80211 and userspace)

To achieve these goals it isn't necessary to track the
software SME's connection status outside of it's state
(which is the part that caused many issues.) Instead,
track it only in the SME data (wdev->conn) and in the
general case only track whether the wdev is connected
or not (via wdev->current_bss.)

Also separate the internal implementation to not have
callbacks from the SME events, but rather call it from
the API functions that the driver (or rather mac80211)
calls. This separates the code better.

Signed-off-by: Johannes Berg

cfg80211: make WoWLAN configuration available to drivers

2013-05-27T13:10:58+00:00

Make the current WoWLAN configuration available to drivers
at runtime. This isn't really useful for the normal WoWLAN
behaviour and accessing it can also be racy, but drivers
may use it for testing the WoWLAN device behaviour while
the host stays up & running to observe the device.

Signed-off-by: Johannes Berg

cfg80211: remove some locked wrappers from sme API

2013-05-24T22:02:22+00:00

By making all the API functions require wdev locking we
can clean up the API a bit, getting rid of the locking
version of each function. This also decreases the size
of cfg80211 by a small amount.

Signed-off-by: Johannes Berg

cfg80211: remove some locked wrappers from mlme API

2013-05-24T22:02:20+00:00

By making all the API functions require wdev locking we
can clean up the API a bit, getting rid of the locking
version of each function. This also decreases the size
of cfg80211 by a small amount.

Signed-off-by: Johannes Berg

cfg80211: vastly simplify locking

2013-05-24T22:02:15+00:00

Virtually all code paths in cfg80211 already (need to) hold
the RTNL. As such, there's little point in having another
four mutexes for various parts of the code, they just cause
lock ordering issues (and much of the time, the RTNL and a
few of the others need thus be held.)

Simplify all this by getting rid of the extra four mutexes
and just use the RTNL throughout. Only a few code changes
were needed to do this and we can get rid of a work struct
for bonus points.

Signed-off-by: Johannes Berg

cfg80211: move cfg80211_get_dev_from_ifindex under wext

2013-05-24T22:02:13+00:00

The function is only used and needed by the wext code
for scanning, so move it there.

Signed-off-by: Johannes Berg

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