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![Benoit Papillault](/assets/img/avatar_default.png)
When ieee80211_offchannel_return is called, it needs to re-enabled TX queues that have been stopped in ieee80211_offchannel_stop_beaconing or ieee80211_offchannel_stop_station. It happens if we are doing a scan with an IBSS interface. In this case, the interface stopped transmitting. Signed-off-by: Benoit Papillault <benoit.papillault@free.fr> Signed-off-by: John W. Linville <linville@tuxdriver.com>
170 lines
5.5 KiB
C
170 lines
5.5 KiB
C
/*
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* Off-channel operation helpers
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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/*
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* inform AP that we will go to sleep so that it will buffer the frames
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* while we scan
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*/
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static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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local->offchannel_ps_enabled = false;
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/* FIXME: what to do when local->pspolling is true? */
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del_timer_sync(&local->dynamic_ps_timer);
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cancel_work_sync(&local->dynamic_ps_enable_work);
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if (local->hw.conf.flags & IEEE80211_CONF_PS) {
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local->offchannel_ps_enabled = true;
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local->hw.conf.flags &= ~IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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}
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if (!(local->offchannel_ps_enabled) ||
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!(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
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/*
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* If power save was enabled, no need to send a nullfunc
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* frame because AP knows that we are sleeping. But if the
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* hardware is creating the nullfunc frame for power save
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* status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
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* enabled) and power save was enabled, the firmware just
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* sent a null frame with power save disabled. So we need
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* to send a new nullfunc frame to inform the AP that we
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* are again sleeping.
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*/
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ieee80211_send_nullfunc(local, sdata, 1);
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}
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/* inform AP that we are awake again, unless power save is enabled */
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static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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if (!local->ps_sdata)
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ieee80211_send_nullfunc(local, sdata, 0);
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else if (local->offchannel_ps_enabled) {
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/*
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* In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
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* will send a nullfunc frame with the powersave bit set
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* even though the AP already knows that we are sleeping.
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* This could be avoided by sending a null frame with power
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* save bit disabled before enabling the power save, but
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* this doesn't gain anything.
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*
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* When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
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* to send a nullfunc frame because AP already knows that
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* we are sleeping, let's just enable power save mode in
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* hardware.
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*/
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local->hw.conf.flags |= IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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} else if (local->hw.conf.dynamic_ps_timeout > 0) {
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/*
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* If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
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* had been running before leaving the operating channel,
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* restart the timer now and send a nullfunc frame to inform
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* the AP that we are awake.
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*/
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ieee80211_send_nullfunc(local, sdata, 0);
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mod_timer(&local->dynamic_ps_timer, jiffies +
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msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
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}
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}
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void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local)
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{
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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/* disable beaconing */
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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/*
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* only handle non-STA interfaces here, STA interfaces
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* are handled in ieee80211_offchannel_stop_station(),
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* e.g., from the background scan state machine.
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*
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* In addition, do not stop monitor interface to allow it to be
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* used from user space controlled off-channel operations.
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*/
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if (sdata->vif.type != NL80211_IFTYPE_STATION &&
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sdata->vif.type != NL80211_IFTYPE_MONITOR)
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netif_tx_stop_all_queues(sdata->dev);
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}
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mutex_unlock(&local->iflist_mtx);
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}
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void ieee80211_offchannel_stop_station(struct ieee80211_local *local)
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{
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struct ieee80211_sub_if_data *sdata;
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/*
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* notify the AP about us leaving the channel and stop all STA interfaces
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*/
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (sdata->vif.type == NL80211_IFTYPE_STATION) {
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netif_tx_stop_all_queues(sdata->dev);
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if (sdata->u.mgd.associated)
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ieee80211_offchannel_ps_enable(sdata);
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}
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}
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mutex_unlock(&local->iflist_mtx);
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}
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void ieee80211_offchannel_return(struct ieee80211_local *local,
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bool enable_beaconing)
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{
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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/* Tell AP we're back */
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if (sdata->vif.type == NL80211_IFTYPE_STATION) {
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if (sdata->u.mgd.associated)
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ieee80211_offchannel_ps_disable(sdata);
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}
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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netif_tx_wake_all_queues(sdata->dev);
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/* re-enable beaconing */
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if (enable_beaconing &&
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(sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT))
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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}
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mutex_unlock(&local->iflist_mtx);
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}
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