Skip to content

L
linux
Switch branch/tag
  1. 18 Dec, 2018 10 commits
  3. 05 Dec, 2018 5 commits
    • Emmanuel Grumbach's avatar
      mac80211: fix deauth TX when we disconnect · f6c7f03f
      Emmanuel Grumbach authored 
      The iTXQs stop/wake queue mechanism involves a whole bunch
of locks and this is probably why the call to
ieee80211_wake_txqs is deferred to a tasklet when called from
__ieee80211_wake_queue.

Another advantage of that is that ieee80211_wake_txqs might
call the wake_tx_queue() callback and then the driver may
call mac80211 which will call it back in the same context.

The bug I saw is that when we send a deauth frame as a
station we do:

flush(drop=1)
tx deauth
flush(drop=0)

While we flush we stop the queues and wake them up
immediately after we finished flushing. The problem here is
that the tasklet that de-facto enables the queue may not have
run until we send the deauth. Then the deauth frame is sent
to the driver (which is surprising by itself), but the driver
won't get anything useful from ieee80211_tx_dequeue because
the queue is stopped (or more precisely because
vif->txqs_stopped[0] is true).
Then the deauth is not sent. Later on, the tasklet will run,
but that'll be too late. We'll already have removed all the
vif etc...

Fix this by calling ieee80211_wake_txqs synchronously if we
are not waking up the queues from the driver (we check the
reason to determine that). This makes the code really
convoluted because we may call ieee80211_wake_txqs from
__ieee80211_wake_queue. The latter assumes that
queue_stop_reason_lock has been taken by the caller and
ieee80211_wake_txqs may release the lock to send the frames.
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      f6c7f03f
    • Bob Copeland's avatar
      mac80211: rewrite Kconfig text for mesh · c8d10cbd
      Bob Copeland authored 
      Lubomir Rintel recently pointed out a dead link for o11s.org, and
repointed it to a still live, but also stale website.  As far as I
know, no one is updating the content at open80211s.org.

Since this Kconfig text was originally written, though, the 802.11s
mesh drafts were approved and ultimately rolled into 802.11 proper.
Meanwhile, the implementation has converged on the final standard,
so we can lose all of the text here and provide something that's a
little more helpful and accurate.
Signed-off-by: default avatarBob Copeland <bobcopeland@fb.com>
Reviewed-by: default avatarLubomir Rintel <lkundrak@v3.sk>
Reviewed-by: default avatarSteve deRosier <derosier@cal-sierra.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      c8d10cbd
    • Cody Schuffelen's avatar
      mac80211-next: rtnetlink wifi simulation device · c7cdba31
      Cody Schuffelen authored 
      This device takes over an existing network device and produces a
new one that appears like a wireless connection, returning enough canned
responses to nl80211 to satisfy a standard connection manager. If
necessary, it can also be set up one step removed from an existing
network device, such as through a vlan/80211Q or macvlan connection to
not disrupt the existing network interface.

To use it to wrap a bare ethernet connection:

ip link add link eth0 name wlan0 type virt_wifi

You may have to rename or otherwise hide the eth0 from your connection
manager, as the original network link will become unusuable and only
the wireless wrapper will be functional. This can also be combined with
vlan or macvlan links on top of eth0 to share the network between
distinct links, but that requires support outside the machine for
accepting vlan-tagged packets or packets from multiple MAC addresses.

This is being used for Google's Remote Android Virtual Device project,
which runs Android devices in virtual machines. The standard network
interfaces provided inside the virtual machines are all ethernet.
However, Android is not interested in ethernet devices and would rather
connect to a wireless interface. This patch allows the virtual machine
guest to treat one of its network connections as wireless rather than
ethernet, satisfying Android's network connection requirements.

We believe this is a generally useful driver for simulating wireless
network connections in other environments where a wireless connection is
desired by some userspace process but is not available.

This is distinct from other testing efforts such as mac80211_hwsim by
being a cfg80211 device instead of mac80211 device, allowing straight
pass-through on the data plane instead of forcing packaging of ethernet
data into mac80211 frames.
Signed-off-by: default avatarA. Cody Schuffelen <schuffelen@google.com>
Acked-by: default avatarAlistair Strachan <astrachan@google.com>
Acked-by: default avatarGreg Hartman <ghartman@google.com>
Acked-by: default avatarTristan Muntsinger <muntsinger@google.com>
[make it a tristate]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      c7cdba31
    • Stephen Hemminger's avatar
      uapi/nl80211: fix spelling errors · cc1068eb
      Stephen Hemminger authored 
      Spelling errors found by codespell
Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      cc1068eb
    • James Prestwood's avatar
      mac80211_hwsim: fixes kernel crash during mac80211_hwsim init · 082b12d4
      James Prestwood authored 
      Creating radios during startup follows a different code path than
HWSIM_CMD_NEW_RADIO. The problem was that param.iftypes was not
being set to the deafult before calling mac80211_hwsim_new_radio
Signed-off-by: default avatarJames Prestwood <james.prestwood@linux.intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      082b12d4
  5. 09 Nov, 2018 25 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7