PWN-Hunter/android_kernel_xiaomi_sdm845
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91f44b0299
android_kernel_xiaomi_sdm845/net/mac80211
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Tim Harvey 91f44b0299 mac80211 default tx_last_beacon false (congestion) 
The 802.11 spec states that the STA that generated the last Beacon frame shall
be the STA that response to a probe request.  This is important for congestion
reduction when a probe request is received - only 1 node in an adhoc BSS
will transmit a response.  While mac80211 drivers should provide the
tx_last_beacon function to report if they transmitted the last beacon many
do not.  As an attempt to reduce probe response congestion default this
to 0 such that a node not implementing this capability does not contribute
to unnecessary congestion.

In a modern medium sized office environment I see upwards of 100 probe
requests per second received at a given node from various hardware/OS/drivers
doing zeroconf 'active probing' as opposed to passively listening for beacons.
With a modest 10-node adhoc network consisting of drivers that do not implement
this tx_last_beacon feature, I have seen this result in the simultaneous xmit
of probe responses accumulating to 500 probe responses per second because of
collisions which brings the adhoc network to its knees as well as causes
needless congestion.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-12-13 15:23:29 -05:00
..
aes_ccm.c mac80211: Remove redundant checks for NULL before calls to crypto_free_cipher() 2010-11-15 13:26:11 -05:00
aes_ccm.h mac80211: pass scratch buffer directly, remove additional pointers 2008-07-08 14:16:02 -04:00
aes_cmac.c mac80211: Remove redundant checks for NULL before calls to crypto_free_cipher() 2010-11-15 13:26:11 -05:00
aes_cmac.h mac80211: 802.11w - Add BIP (AES-128-CMAC) 2009-01-29 16:00:02 -05:00
agg-rx.c mac80211: fix RX aggregation locking 2010-11-29 15:30:30 -05:00
agg-tx.c mac80211: avoid transmitting delBA to old AP 2010-10-06 16:30:40 -04:00
cfg.c mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
cfg.h [MAC80211]: rename ieee80211_cfg.h to cfg.h 2007-10-10 16:52:34 -07:00
chan.c cfg80211/mac80211: use lockdep_assert_held 2010-09-16 15:46:00 -04:00
debugfs_key.c mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
debugfs_key.h mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
debugfs_netdev.c nl80211/mac80211: define and allow configuring mesh element TTL 2010-12-06 16:01:28 -05:00
debugfs_netdev.h mac80211: reduce reliance on netdev 2009-12-21 18:38:52 -05:00
debugfs_sta.c mac80211: fix RX aggregation locking 2010-11-29 15:30:30 -05:00
debugfs_sta.h mac80211: RCU-ify STA info structure access 2008-03-06 15:30:46 -05:00
debugfs.c mac80211: refactor debugfs function generation code 2010-11-15 13:24:48 -05:00
debugfs.h mac80211: refactor debugfs function generation code 2010-11-15 13:24:48 -05:00
driver-ops.h mac80211 default tx_last_beacon false (congestion) 2010-12-13 15:23:29 -05:00
driver-trace.c mac80211: fix sparse warnings/errors 2009-08-04 16:43:25 -04:00
driver-trace.h mac80211: Add antenna configuration 2010-11-16 16:37:05 -05:00
event.c cfg80211: use proper allocation flags 2009-07-10 15:01:49 -04:00
ht.c mac80211: fix SMPS request 2010-10-13 15:45:23 -04:00
ibss.c cfg80211/mac80211: improve ad-hoc multicast rate handling 2010-11-24 16:19:35 -05:00
ieee80211_i.h mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
iface.c cfg80211/mac80211: add mesh join/leave commands 2010-12-06 16:01:29 -05:00
Kconfig nl80211/mac80211: Report signal average 2010-12-07 16:09:12 -05:00
key.c mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
key.h mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
led.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
led.h mac80211: rename files 2008-04-08 16:44:45 -04:00
main.c mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
Makefile mac80211: add the minstrel_ht rate control algorithm 2010-06-02 16:12:59 -04:00
mesh_hwmp.c nl80211/mac80211: define and allow configuring mesh element TTL 2010-12-06 16:01:28 -05:00
mesh_pathtbl.c nl80211/mac80211: define and allow configuring mesh element TTL 2010-12-06 16:01:28 -05:00
mesh_plink.c mac80211: fix possible null-pointer de-reference 2010-10-11 15:04:20 -04:00
mesh.c cfg80211/mac80211: add mesh join/leave commands 2010-12-06 16:01:29 -05:00
mesh.h cfg80211/mac80211: add mesh join/leave commands 2010-12-06 16:01:29 -05:00
michael.c mac80211: remove ieee80211_get_hdr_info 2008-07-08 14:16:01 -04:00
michael.h mac80211: remove ieee80211_get_hdr_info 2008-07-08 14:16:01 -04:00
mlme.c mac80211: fix a compiler warning 2010-12-07 17:08:06 -05:00
offchannel.c mac80211: disable beacon monitor while going offchannel 2010-09-16 15:46:17 -04:00
pm.c mac80211: assure we also cancel deferred scan request 2010-10-06 16:30:42 -04:00
rate.c cfg80211/mac80211: improve ad-hoc multicast rate handling 2010-11-24 16:19:35 -05:00
rate.h mac80211: add the minstrel_ht rate control algorithm 2010-06-02 16:12:59 -04:00
rc80211_minstrel_debugfs.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
rc80211_minstrel_ht_debugfs.c mac80211: disallow seeks in minstrel debug code 2010-09-16 10:33:17 +02:00
rc80211_minstrel_ht.c mac80211: avoid aggregation for VO traffic 2010-11-24 16:19:36 -05:00
rc80211_minstrel_ht.h minstrel_ht: move minstrel_mcs_groups declaration to header file 2010-06-24 15:42:18 -04:00
rc80211_minstrel.c minstrel: don't complain about feedback for unrequested rates 2010-07-26 15:09:04 -04:00
rc80211_minstrel.h minstrel: make the rate control ops reusable from another rc implementation 2010-03-10 17:44:23 -05:00
rc80211_pid_algo.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rc80211_pid_debugfs.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
rc80211_pid.h mac80211/drivers: rewrite the rate control API 2008-10-31 19:00:23 -04:00
rx.c mac80211: clean up RX key checks 2010-12-13 15:23:28 -05:00
scan.c mac80211: fix sw scan locking 2010-10-07 14:41:27 -04:00
spectmgmt.c mac80211: reduce reliance on netdev 2009-12-21 18:38:52 -05:00
sta_info.c nl80211/mac80211: Report signal average 2010-12-07 16:09:12 -05:00
sta_info.h nl80211/mac80211: Report signal average 2010-12-07 16:09:12 -05:00
status.c mac80211: speed up AP probing using nullfunc frames 2010-12-06 15:58:44 -05:00
tkip.c mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
tkip.h mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
tx.c mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
util.c mac80211: fix powersaving clients races 2010-11-17 16:19:33 -05:00
wep.c mac80211: don't kmalloc 16 bytes 2010-10-11 15:04:23 -04:00
wep.h mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
wme.c mac80211: defines for AC numbers 2010-11-17 16:19:31 -05:00
wme.h mac80211: fix skb buffering issue 2010-01-05 16:21:40 -05:00
work.c mac80211: Show max number of probe tries in debug message. 2010-12-08 15:38:44 -05:00
wpa.c mac80211: move packet flags into packet 2010-09-27 15:57:54 -04:00
wpa.h mac80211: 802.11w - Add BIP (AES-128-CMAC) 2009-01-29 16:00:02 -05:00