On locally originated traffic, we refresh active paths after a timeout.  The
decision to do this was using the wrong sign and therefore the refresh timer
was triggered for every frame.
Signed-off-by: NAndrey Yurovsky <andrey@cozybit.com>
Signed-off-by: NJavier Cardona <javier@cozybit.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Also, fix typo in comment.
Signed-off-by: NJavier Cardona <javier@cozybit.com>
Tested-by: NAndrey Yurovsky <andrey@cozybit.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Mesh is currently disabled on mac80211, its marked
as broken. This patch gets it to compile though,
to account for the mac80211 workqueue changes.
There was a simple typo in the patches for mesh
for the workqueue migration, but we never compile
tested it as we couldn't even select mesh as its
broken. Lets at least let it compile for those
interested in getting it fixed.
Reported-by: NPat Erley <pat-lkml@erley.org>
Signed-off-by: NLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The mac80211 workqueue exists to enable mac80211 and drivers
to queue their own work on a single threaded workqueue. mac80211
takes care to flush the workqueue during suspend but we never
really had requirements on drivers for how they should use
the workqueue in consideration for suspend.

We extend mac80211 to document how the mac80211 workqueue should
be used, how it should not be used and finally move raw access to
the workqueue to mac80211 only. Drivers and mac80211 use helpers
to queue work onto the mac80211 workqueue:

  * ieee80211_queue_work()
  * ieee80211_queue_delayed_work()

These helpers will now warn if mac80211 already completed its
suspend cycle and someone is trying to queue work. mac80211
flushes the mac80211 workqueue prior to suspend a few times,
but we haven't taken the care to ensure drivers won't add more
work after suspend. To help with this we add a warning when
someone tries to add work and mac80211 already completed the
suspend cycle.

Drivers should ensure they cancel any work or delayed work
in the mac80211 stop() callback.
Signed-off-by: NLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The removal of the master netdev broke the mesh forwarding path.  This patch
fixes it by using the new internal 'pending' queue.

As a result of this change, mesh forwarding no longer does the inefficient
802.11 -> 802.3 -> 802.11 conversion that was done before.

[Changes since v1]
Suggested by Johannes:
 - Select queue before adding to mpath queue
 - ieee80211_add_pending_skb -> ieee80211_add_pending_skbs
 - Remove unnecessary header wme.h
Signed-off-by: NJavier Cardona <javier@cozybit.com>
Signed-off-by: NAndrey Yurovsky <andrey@cozybit.com>
Reviewed-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

1) there's a spin_lock() that needs to be spin_lock_bh()
2) action frames of size 24 might cause an out-of-bounds
   memory access (for the 25th byte only, so no big deal)
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

We allocate a PREQ queue node in mesh_queue_preq, however the allocation
may cause us to sleep.  Use GFP_ATOMIC to prevent this.

[ 1869.126498] BUG: scheduling while atomic: ping/1859/0x10000100
[ 1869.127164] Modules linked in: ath5k mac80211 ath
[ 1869.128310] Pid: 1859, comm: ping Not tainted 2.6.30-wl #1
[ 1869.128754] Call Trace:
[ 1869.129293]  [<c1023a2b>] __schedule_bug+0x48/0x4d
[ 1869.129866]  [<c13b5533>] __schedule+0x77/0x67a
[ 1869.130544]  [<c1026f2e>] ? release_console_sem+0x17d/0x185
[ 1869.131568]  [<c807cf47>] ? mesh_queue_preq+0x2b/0x165 [mac80211]
[ 1869.132318]  [<c13b5b3e>] schedule+0x8/0x1f
[ 1869.132807]  [<c1023c12>] __cond_resched+0x16/0x2f
[ 1869.133478]  [<c13b5bf0>] _cond_resched+0x27/0x32
[ 1869.134191]  [<c108a370>] kmem_cache_alloc+0x1c/0xcf
[ 1869.134714]  [<c10273ae>] ? printk+0x15/0x17
[ 1869.135670]  [<c807cf47>] mesh_queue_preq+0x2b/0x165 [mac80211]
[ 1869.136731]  [<c807d1f8>] mesh_nexthop_lookup+0xee/0x12d [mac80211]
[ 1869.138130]  [<c807417e>] ieee80211_xmit+0xe6/0x2b2 [mac80211]
[ 1869.138935]  [<c80be46d>] ? ath5k_hw_setup_rx_desc+0x0/0x66 [ath5k]
[ 1869.139831]  [<c80c97bc>] ? ath5k_tasklet_rx+0xba/0x506 [ath5k]
[ 1869.140863]  [<c8075191>] ieee80211_subif_start_xmit+0x6c9/0x6e4
[mac80211]
[ 1869.141665]  [<c105cf1c>] ? handle_level_irq+0x78/0x9d
[ 1869.142390]  [<c12e3f93>] dev_hard_start_xmit+0x168/0x1c7
[ 1869.143092]  [<c12f1f17>] __qdisc_run+0xe1/0x1b7
[ 1869.143612]  [<c12e25ff>] qdisc_run+0x18/0x1a
[ 1869.144248]  [<c12e62f4>] dev_queue_xmit+0x16a/0x25a
[ 1869.144785]  [<c13b6dcc>] ? _read_unlock_bh+0xe/0x10
[ 1869.145465]  [<c12eacdb>] neigh_resolve_output+0x19c/0x1c7
[ 1869.146182]  [<c130e2da>] ? ip_finish_output+0x0/0x51
[ 1869.146697]  [<c130e2a0>] ip_finish_output2+0x182/0x1bc
[ 1869.147358]  [<c130e327>] ip_finish_output+0x4d/0x51
[ 1869.147863]  [<c130e9d5>] ip_output+0x80/0x85
[ 1869.148515]  [<c130cc49>] dst_output+0x9/0xb
[ 1869.149141]  [<c130dec6>] ip_local_out+0x17/0x1a
[ 1869.149632]  [<c130e0bc>] ip_push_pending_frames+0x1f3/0x255
[ 1869.150343]  [<c13247ff>] raw_sendmsg+0x5e6/0x667
[ 1869.150883]  [<c1033c55>] ? insert_work+0x6a/0x73
[ 1869.151834]  [<c8071e00>] ?
ieee80211_invoke_rx_handlers+0x17da/0x1ae8 [mac80211]
[ 1869.152630]  [<c132bd68>] inet_sendmsg+0x3b/0x48
[ 1869.153232]  [<c12d7deb>] __sock_sendmsg+0x45/0x4e
[ 1869.153740]  [<c12d8537>] sock_sendmsg+0xb8/0xce
[ 1869.154519]  [<c80be46d>] ? ath5k_hw_setup_rx_desc+0x0/0x66 [ath5k]
[ 1869.155289]  [<c1036b25>] ? autoremove_wake_function+0x0/0x30
[ 1869.155859]  [<c115992b>] ? __copy_from_user_ll+0x11/0xce
[ 1869.156573]  [<c1159d99>] ? copy_from_user+0x31/0x54
[ 1869.157235]  [<c12df646>] ? verify_iovec+0x40/0x6e
[ 1869.157778]  [<c12d869a>] sys_sendmsg+0x14d/0x1a5
[ 1869.158714]  [<c8072c40>] ? __ieee80211_rx+0x49e/0x4ee [mac80211]
[ 1869.159641]  [<c80c83fe>] ? ath5k_rxbuf_setup+0x6d/0x8d [ath5k]
[ 1869.160543]  [<c80be46d>] ? ath5k_hw_setup_rx_desc+0x0/0x66 [ath5k]
[ 1869.161434]  [<c80beba4>] ? ath5k_hw_get_rxdp+0xe/0x10 [ath5k]
[ 1869.162319]  [<c80c97bc>] ? ath5k_tasklet_rx+0xba/0x506 [ath5k]
[ 1869.163063]  [<c1005627>] ? enable_8259A_irq+0x40/0x43
[ 1869.163594]  [<c101edb8>] ? __dequeue_entity+0x23/0x27
[ 1869.164793]  [<c100187a>] ? __switch_to+0x2b/0x105
[ 1869.165442]  [<c1021d5f>] ? finish_task_switch+0x5b/0x74
[ 1869.166129]  [<c12d963a>] sys_socketcall+0x14b/0x17b
[ 1869.166612]  [<c1002b95>] syscall_call+0x7/0xb
Signed-off-by: NAndrey Yurovsky <andrey@cozybit.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

We forgot to cancel all timers in mac80211 when suspending.
In particular we forgot to deal with some things that can
cause hardware reconfiguration -- while it is down.

While at it we go ahead and add a warning in ieee80211_sta_work()
if its run while the suspend->resume cycle is in effect. This
should not happen and if it does it would indicate there is
a bug lurking in either mac80211 or mac80211 drivers.

With this now wpa_supplicant doesn't blink when I go to suspend
and resume where as before there where issues with some timers
running during the suspend->resume cycle. This caused a lot of
incorrect assumptions and would at times bring back the device
in an incoherent, but mostly recoverable, state.
Signed-off-by: NLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The values are in TUs (1.024ms), not ms.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch fixes the documentation of mesh_nexthop_lookup() in mesh_hwmp.c.
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

When sending out Action frames, allow ieee80211_tx_skb() to send them
without enforcing do_not_encrypt. These frames will be encrypted if
MFP has been negotiated.
Signed-off-by: NJouni Malinen <jouni.malinen@atheros.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Remove redundant argument comments in files of net/*
Signed-off-by: NQinghuang Feng <qhfeng.kernel@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

So after the previous changes we were still unhappy with how
convoluted the API is and decided to make things simpler for
everybody. This completely changes the rate control API, now
taking into account 802.11n with MCS rates and more control,
most drivers don't support that though.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The sta_info->txrate_idx member isn't used by all RC algorithms
in the way it was intended to be used, move it into those that
require it (only PID) and keep track in the core code of which
rate was last used for reporting to userspace and the mesh MLME.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch changes mac80211 to share some more data about
stations with drivers. Should help iwlwifi and ath9k when
 they get around to updating, and might also help with
implementing rate control algorithms without internals.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Cc: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch splits off mesh handling from the STA/IBSS.
Unfortunately it increases mesh code size a bit, but I
think it makes things clearer. The patch also reduces
per-interface run-time memory usage.

Also clean up a few places where ifdef is not required.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The ieee80211_sta_tx function isn't MLME code any more,
it's getting used by a lot of code. Move it to utils and
rename it to ieee80211_tx_skb.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

The action frame length checks are one too small, there's not just
an action code as the comment makes you believe, there's a category
code too, and the category code is required in each action frame
(hence part of IEEE80211_MIN_ACTION_SIZE).
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch replaces net_device arguments to mac80211 internal functions
with ieee80211_{local,sub_if_data} as appropriate.

It also does the same for many 802.11s mesh functions, and changes the
mesh path table to be indexed on sub_if_data rather than net_device.

If the mesh part needs to be a separate patch let me know, but since
mesh uses a lot of mac80211 functions which were being converted anyway,
the changes go hand-in-hand somewhat.

This patch probably does not convert all the functions which could be
converted, but it is a large chunk and followup patches will be
provided.
Signed-off-by: NJasper Bryant-Greene <jasper@amiton.co.nz>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Now we deal with mesh forwarding before the 802.11->802.3 conversion, thus
eliminating a few unnecessary steps. The next hop lookup is called from
ieee80211_master_start_xmit() instead of subif_start_xmit(). Until the next hop
is found, RA in the frame will be all zeroes for frames originating from the
device. For forwarded frames, RA will contain the TA of the received frame,
which will be necessary to send a path error if a next hop is not found.
Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Really doesn't need to be defined four times.

Also, while at it, remove a useless macro (IEEE80211_ALIGN32_PAD)
and a function prototype for a function we don't actually have
(ieee80211_set_compression.)
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Postponing the deletion is not really useful anymore.
Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch fixes all the mesh related endianness warnings reported by sparse. As
they were the reason why Johannes marked mesh as BROKEN, that flag has been
removed.
Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Acked-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This makes access to the STA hash table/list use RCU to protect
against freeing of items. However, it's not a true RCU, the
copy step is missing: whenever somebody changes a STA item it
is simply updated. This is an existing race condition that is
now somewhat understandable.

This patch also fixes the race key freeing vs. STA destruction
by making sure that sta_info_destroy() is always called under
RTNL and frees the key.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This fixes missing unlocks noticed by sparse.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This file implements the on-demand Hybrid Wireless Mesh Protocol, at this moment
using hop-count as the metric. When no mesh path exists for a given destination
or the mesh path is not active, frames addressed to that destination will be
queued and a Path Request frame will be sent. Queued frames will be sent when
the path is resolved (usually after reception of a Path Response) or discarded
if discovery times out. Path Requests will also be sent to refresh paths that
are being used and are close to expiring.

Path Errors are sent when a path discovery process triggered by the attempt to
forward a frame originated in a different mesh point times out. Path Errors are
also sent when a peer link is determined to be unreachable because of high error
rates.

Multiple destination support in Path Requests and Path Errors and precursors
have not been implemented yet.
Signed-off-by: NLuis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>