1. 03 Jun, 2010 1 commit
  2. 02 Jun, 2010 1 commit
  3. 12 May, 2010 1 commit
  4. 07 May, 2010 2 commits
    • Johannes Berg's avatar
      mac80211: improve HT channel handling · 0aaffa9b
      Johannes Berg authored
      
      
      Currently, when one interface switches HT mode,
      all others will follow along. This is clearly
      undesirable, since the new one might switch to
      no-HT while another one is operating in HT.
      
      Address this issue by keeping track of the HT
      mode per interface, and allowing only changes
      that are compatible, i.e. switching into HT40+
      is not possible when another interface is in
      HT40-, in that case the second one needs to
      fall back to HT20.
      
      Also, to allow drivers to know what's going on,
      store the per-interface HT mode (channel type)
      in the virtual interface's bss_conf.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      0aaffa9b
    • Johannes Berg's avatar
      cfg80211/mac80211: better channel handling · f444de05
      Johannes Berg authored
      
      
      Currently (all tested with hwsim) you can do stupid
      things like setting up an AP on a certain channel,
      then adding another virtual interface and making
      that associate on another channel -- this will make
      the beaconing to move channel but obviously without
      the necessary IEs data update.
      
      In order to improve this situation, first make the
      configuration APIs (cfg80211 and nl80211) aware of
      multi-channel operation -- we'll eventually need
      that in the future anyway. There's one userland API
      change and one API addition. The API change is that
      now SET_WIPHY must be called with virtual interface
      index rather than only wiphy index in order to take
      effect for that interface -- luckily all current
      users (hostapd) do that. For monitor interfaces, the
      old setting is preserved, but monitors are always
      slaved to other devices anyway so no guarantees.
      
      The second userland API change is the introduction
      of a per virtual interface SET_CHANNEL command, that
      hostapd should use going forward to make it easier
      to understand what's going on (it can automatically
      detect a kernel with this command).
      
      Other than mac80211, no existing cfg80211 drivers
      are affected by this change because they only allow
      a single virtual interface.
      
      mac80211, however, now needs to be aware that the
      channel settings are per interface now, and needs
      to disallow (for now) real multi-channel operation,
      which is another important part of this patch.
      
      One of the immediate benefits is that you can now
      start hostapd to operate on a hardware that already
      has a connection on another virtual interface, as
      long as you specify the same channel.
      
      Note that two things are left unhandled (this is an
      improvement -- not a complete fix):
      
       * different HT/no-HT modes
      
         currently you could start an HT AP and then
         connect to a non-HT network on the same channel
         which would configure the hardware for no HT;
         that can be fixed fairly easily
      
       * CSA
      
         An AP we're connected to on a virtual interface
         might indicate switching channels, and in that
         case we would follow it, regardless of how many
         other interfaces are operating; this requires
         more effort to fix but is pretty rare after all
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      f444de05
  5. 03 May, 2010 1 commit
    • Johannes Berg's avatar
      mac80211: improve IBSS scanning · be4a4b6a
      Johannes Berg authored
      
      
      When IBSS is fixed to a frequency, it can still
      scan to try to find the right BSSID. This makes
      sense if the BSSID isn't also fixed, but it need
      not scan all channels -- just one is sufficient.
      Make it do that by moving the scan setup code to
      ieee80211_request_internal_scan() and include
      a channel variable setting.
      
      Note that this can be further improved to start
      the IBSS right away if both frequency and BSSID
      are fixed.
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      be4a4b6a
  6. 07 Apr, 2010 1 commit
  7. 03 Apr, 2010 1 commit
    • Jiri Pirko's avatar
      net: convert multicast list to list_head · 22bedad3
      Jiri Pirko authored
      
      
      Converts the list and the core manipulating with it to be the same as uc_list.
      
      +uses two functions for adding/removing mc address (normal and "global"
       variant) instead of a function parameter.
      +removes dev_mcast.c completely.
      +exposes netdev_hw_addr_list_* macros along with __hw_addr_* functions for
       manipulation with lists on a sandbox (used in bonding and 80211 drivers)
      Signed-off-by: default avatarJiri Pirko <jpirko@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      22bedad3
  8. 31 Mar, 2010 1 commit
  9. 23 Mar, 2010 1 commit
  10. 09 Mar, 2010 1 commit
    • Helmut Schaa's avatar
      mac80211: Improve software scan timing · df13cce5
      Helmut Schaa authored
      
      
      The current software scan implemenation in mac80211 returns to the operating
      channel after each scanned channel. However, in some situations (e.g. no
      traffic) it would be nicer to scan a few channels in a row to speed up
      the scan itself.
      
      Hence, after scanning a channel, check if we have queued up any tx frames and
      return to the operating channel in that case.
      
      Unfortunately we don't know if the AP has buffered any frames for us. Hence,
      scan only as many channels in a row as the pm_qos latency and the negotiated
      listen interval allows us to.
      Signed-off-by: default avatarHelmut Schaa <helmut.schaa@googlemail.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      df13cce5
  11. 15 Feb, 2010 1 commit
    • Jouni Malinen's avatar
      cfg80211/mac80211: allow registering for and sending action frames · 026331c4
      Jouni Malinen authored
      
      
      This implements a new command to register for action frames
      that userspace wants to handle instead of the in-kernel
      rejection. It is then responsible for rejecting ones that
      it decided not to handle. There is no unregistration, but
      the socket can be closed for that.
      
      Frames that are not registered for will not be forwarded
      to userspace and will be rejected by the kernel, the
      cfg80211 API helps implementing that.
      
      Additionally, this patch adds a new command that allows
      doing action frame transmission from userspace. It can be
      used either to exchange action frames on the current
      operational channel (e.g., with the AP with which we are
      currently associated) or to exchange off-channel Public
      Action frames with the remain-on-channel command.
      Signed-off-by: default avatarJouni Malinen <jouni.malinen@atheros.com>
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      026331c4
  12. 09 Feb, 2010 1 commit
  13. 08 Feb, 2010 1 commit
    • Johannes Berg's avatar
      mac80211: allow station add/remove to sleep · 34e89507
      Johannes Berg authored
      
      
      Many drivers would like to sleep during station
      addition and removal, and currently have a high
      complexity there from not being able to.
      
      This introduces two new callbacks sta_add() and
      sta_remove() that drivers can implement instead
      of using sta_notify() and that can sleep, and
      the new sta_add() callback is also allowed to
      fail.
      
      The reason we didn't do this previously is that
      the IBSS code wants to insert stations from the
      RX path, which is a tasklet, so cannot sleep.
      This patch will keep the station allocation in
      that path, but moves adding the station to the
      driver out of line. Since the addition can now
      fail, we can have IBSS peer structs the driver
      rejected -- in that case we still talk to the
      station but never tell the driver about it in
      the control.sta pointer. If there will ever be
      a driver that has a low limit on the number of
      stations and that cannot talk to any stations
      that are not known to it, we need to do come up
      with a new strategy of handling larger IBSSs,
      maybe quicker expiry or rejecting peers.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      34e89507
  14. 25 Jan, 2010 1 commit
  15. 12 Jan, 2010 3 commits
    • Kalle Valo's avatar
      mac80211: add debugfs interface for U-APSD queue configuration · 50ae0cf1
      Kalle Valo authored
      
      
      Because it's not yet decided how to configure which queues are U-APSD
      enabled, add a debugfs interface for testing purposes.
      Signed-off-by: default avatarKalle Valo <kalle.valo@nokia.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      50ae0cf1
    • Kalle Valo's avatar
      mac80211: add U-APSD client support · ab13315a
      Kalle Valo authored
      
      
      Add Unscheduled Automatic Power-Save Delivery (U-APSD) client support. The
      idea is that the data frames from the client trigger AP to send the buffered
      frames with ACs which have U-APSD enabled. This decreases latency and makes it
      possible to save even more power.
      
      Driver needs to use IEEE80211_HW_UAPSD to enable the feature. The current
      implementation assumes that firmware takes care of the wakeup and
      hardware needing IEEE80211_HW_PS_NULLFUNC_STACK is not yet supported.
      
      Tested with wl1251 on a Nokia N900 and Cisco Aironet 1231G AP and running
      various test traffic with ping.
      Signed-off-by: default avatarKalle Valo <kalle.valo@nokia.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      ab13315a
    • Jouni Malinen's avatar
      cfg80211/mac80211: Use more generic bitrate mask for rate control · 37eb0b16
      Jouni Malinen authored
      
      
      Extend struct cfg80211_bitrate_mask to actually use a bitfield mask
      instead of just a single fixed or maximum rate index. This change
      itself does not modify the behavior (except for debugfs files), but it
      prepares cfg80211 and mac80211 for a new nl80211 command for setting
      which rates can be used in TX rate control.
      
      Since frames are now going through the rate control algorithm
      unconditionally, the internal IEEE80211_TX_INTFL_RCALGO flag can now
      be removed. The RC implementations can use the rate_idx_mask value to
      optimize their behavior if only a single rate is enabled.
      
      The old max_rate_idx in struct ieee80211_tx_rate_control is maintained
      (but commented as deprecated) for backwards compatibility with existing
      RC implementations. Once these implementations have been updated to
      use the more generic rate_idx_mask, the max_rate_idx value can be
      removed.
      Signed-off-by: default avatarJouni Malinen <jouni.malinen@atheros.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      37eb0b16
  16. 28 Dec, 2009 9 commits
  17. 22 Dec, 2009 2 commits
  18. 21 Dec, 2009 1 commit
    • Johannes Berg's avatar
      mac80211: reduce reliance on netdev · 47846c9b
      Johannes Berg authored
      
      
      For bluetooth 3, we will most likely not have
      a netdev for a virtual interface (sdata), so
      prepare for that by reducing the reliance on
      having a netdev. This patch moves the name
      and address fields into the sdata struct and
      uses them from there all over. Some work is
      needed to keep them sync'ed, but that's not
      a lot of work and in slow paths anyway.
      
      In doing so, this also reduces the number of
      pointer dereferences in many places, because
      of things like sdata->dev->dev_addr becoming
      sdata->vif.addr.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      47846c9b
  19. 07 Dec, 2009 1 commit
  20. 30 Nov, 2009 1 commit
    • Johannes Berg's avatar
      mac80211: fix spurious delBA handling · 827d42c9
      Johannes Berg authored
      Lennert Buytenhek noticed that delBA handling in mac80211
      was broken and has remotely triggerable problems, some of
      which are due to some code shuffling I did that ended up
      changing the order in which things were done -- this was
      
        commit d75636ef
        Author: Johannes Berg <johannes@sipsolutions.net>
        Date:   Tue Feb 10 21:25:53 2009 +0100
      
          mac80211: RX aggregation: clean up stop session
      
      and other parts were already present in the original
      
        commit d92684e6
      
      
        Author: Ron Rindjunsky <ron.rindjunsky@intel.com>
        Date:   Mon Jan 28 14:07:22 2008 +0200
      
            mac80211: A-MPDU Tx add delBA from recipient support
      
      The first problem is that I moved a BUG_ON before various
      checks -- thereby making it possible to hit. As the comment
      indicates, the BUG_ON can be removed since the ampdu_action
      callback must already exist when the state is != IDLE.
      
      The second problem isn't easily exploitable but there's a
      race condition due to unconditionally setting the state to
      OPERATIONAL when a delBA frame is received, even when no
      aggregation session was ever initiated. All the drivers
      accept stopping the session even then, but that opens a
      race window where crashes could happen before the driver
      accepts it. Right now, a WARN_ON may happen with non-HT
      drivers, while the race opens only for HT drivers.
      
      For this case, there are two things necessary to fix it:
       1) don't process spurious delBA frames, and be more careful
          about the session state; don't drop the lock
      
       2) HT drivers need to be prepared to handle a session stop
          even before the session was really started -- this is
          true for all drivers (that support aggregation) but
          iwlwifi which can be fixed easily. The other HT drivers
          (ath9k and ar9170) are behaving properly already.
      Reported-by: default avatarLennert Buytenhek <buytenh@marvell.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      827d42c9
  21. 28 Nov, 2009 2 commits
  22. 23 Nov, 2009 1 commit
  23. 19 Nov, 2009 2 commits
    • Johannes Berg's avatar
      cfg80211: introduce capability for 4addr mode · 9bc383de
      Johannes Berg authored
      
      
      It's very likely that not many devices will support
      four-address mode in station or AP mode so introduce
      capability bits for both modes, set them in mac80211
      and check them when userspace tries to use the mode.
      Also, keep track of 4addr in cfg80211 (wireless_dev)
      and not in mac80211 any more. mac80211 can also be
      improved for the VLAN case by not looking at the
      4addr flag but maintaining the station pointer for
      it correctly. However, keep track of use_4addr for
      station mode in mac80211 to avoid all the derefs.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      9bc383de
    • Johannes Berg's avatar
      mac80211: fix resume · ceb99fe0
      Johannes Berg authored
      
      
      When mac80211 resumes, it currently first sets suspended
      to false so the driver can start doing things and we can
      receive frames.
      
      However, if we actually receive frames then it can end
      up starting some work which adds timers and then later
      runs into a BUG_ON in the timer code because it tries
      add_timer() on a pending timer.
      
      Fix this by keeping track of the resuming process by
      introducing a new variable 'resuming' which gets set to
      true early on instead of setting 'suspended' to false,
      and allow queueing work but not receiving frames while
      resuming.
      Reported-by: default avatarMaxim Levitsky <maximlevitsky@gmail.com>
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      ceb99fe0
  24. 18 Nov, 2009 3 commits