![Emmanuel Grumbach](/assets/img/avatar_default.png)
This low level driver can find it useful to get the vif when a remain on channel session is cancelled. iwlwifi will need this soon. Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Link: https://lore.kernel.org/r/20190723180001.5828-1-emmanuel.grumbach@intel.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1009 lines
26 KiB
C
1009 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Copyright (C) 2019 Intel Corporation
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*/
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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/*
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* Tell our hardware to disable PS.
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* Optionally inform AP that we will go to sleep so that it will buffer
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* the frames while we are doing off-channel work. This is optional
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* because we *may* be doing work on-operating channel, and want our
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* hardware unconditionally awake, but still let the AP send us normal frames.
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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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struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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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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del_timer_sync(&ifmgd->bcn_mon_timer);
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del_timer_sync(&ifmgd->conn_mon_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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!ieee80211_hw_check(&local->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, true);
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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, false);
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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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/* TODO: Only set hardware if CONF_PS changed?
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* TODO: Should we set offchannel_ps_enabled to false?
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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, false);
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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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ieee80211_sta_reset_beacon_monitor(sdata);
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ieee80211_sta_reset_conn_monitor(sdata);
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}
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void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local)
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{
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struct ieee80211_sub_if_data *sdata;
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if (WARN_ON(local->use_chanctx))
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return;
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/*
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* notify the AP about us leaving the channel and stop all
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* STA interfaces.
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*/
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/*
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* Stop queues and transmit all frames queued by the driver
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* before sending nullfunc to enable powersave at the AP.
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*/
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ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
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IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
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false);
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ieee80211_flush_queues(local, NULL, false);
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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_P2P_DEVICE ||
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sdata->vif.type == NL80211_IFTYPE_NAN)
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continue;
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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/* Check to see if we should disable beaconing. */
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if (sdata->vif.bss_conf.enable_beacon) {
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set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
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&sdata->state);
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sdata->vif.bss_conf.enable_beacon = false;
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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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if (sdata->vif.type == NL80211_IFTYPE_STATION &&
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sdata->u.mgd.associated)
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ieee80211_offchannel_ps_enable(sdata);
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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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{
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struct ieee80211_sub_if_data *sdata;
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if (WARN_ON(local->use_chanctx))
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return;
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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 (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
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continue;
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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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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sdata->u.mgd.associated)
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ieee80211_offchannel_ps_disable(sdata);
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if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
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&sdata->state)) {
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sdata->vif.bss_conf.enable_beacon = true;
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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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}
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mutex_unlock(&local->iflist_mtx);
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ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
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IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
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false);
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}
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static void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
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{
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/* was never transmitted */
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if (roc->frame) {
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cfg80211_mgmt_tx_status(&roc->sdata->wdev, roc->mgmt_tx_cookie,
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roc->frame->data, roc->frame->len,
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false, GFP_KERNEL);
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ieee80211_free_txskb(&roc->sdata->local->hw, roc->frame);
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}
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if (!roc->mgmt_tx_cookie)
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cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
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roc->cookie, roc->chan,
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GFP_KERNEL);
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else
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cfg80211_tx_mgmt_expired(&roc->sdata->wdev,
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roc->mgmt_tx_cookie,
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roc->chan, GFP_KERNEL);
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list_del(&roc->list);
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kfree(roc);
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}
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static unsigned long ieee80211_end_finished_rocs(struct ieee80211_local *local,
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unsigned long now)
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{
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struct ieee80211_roc_work *roc, *tmp;
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long remaining_dur_min = LONG_MAX;
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lockdep_assert_held(&local->mtx);
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list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
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long remaining;
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if (!roc->started)
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break;
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remaining = roc->start_time +
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msecs_to_jiffies(roc->duration) -
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now;
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/* In case of HW ROC, it is possible that the HW finished the
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* ROC session before the actual requested time. In such a case
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* end the ROC session (disregarding the remaining time).
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*/
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if (roc->abort || roc->hw_begun || remaining <= 0)
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ieee80211_roc_notify_destroy(roc);
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else
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remaining_dur_min = min(remaining_dur_min, remaining);
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}
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return remaining_dur_min;
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}
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static bool ieee80211_recalc_sw_work(struct ieee80211_local *local,
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unsigned long now)
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{
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long dur = ieee80211_end_finished_rocs(local, now);
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if (dur == LONG_MAX)
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return false;
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mod_delayed_work(local->workqueue, &local->roc_work, dur);
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return true;
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}
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static void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc,
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unsigned long start_time)
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{
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if (WARN_ON(roc->notified))
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return;
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roc->start_time = start_time;
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roc->started = true;
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if (roc->mgmt_tx_cookie) {
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if (!WARN_ON(!roc->frame)) {
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ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7,
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roc->chan->band, 0);
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roc->frame = NULL;
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}
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} else {
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cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
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roc->chan, roc->req_duration,
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GFP_KERNEL);
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}
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roc->notified = true;
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}
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static void ieee80211_hw_roc_start(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_start);
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struct ieee80211_roc_work *roc;
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mutex_lock(&local->mtx);
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list_for_each_entry(roc, &local->roc_list, list) {
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if (!roc->started)
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break;
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roc->hw_begun = true;
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ieee80211_handle_roc_started(roc, local->hw_roc_start_time);
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}
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mutex_unlock(&local->mtx);
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}
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void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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local->hw_roc_start_time = jiffies;
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trace_api_ready_on_channel(local);
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ieee80211_queue_work(hw, &local->hw_roc_start);
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}
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EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
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static void _ieee80211_start_next_roc(struct ieee80211_local *local)
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{
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struct ieee80211_roc_work *roc, *tmp;
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enum ieee80211_roc_type type;
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u32 min_dur, max_dur;
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lockdep_assert_held(&local->mtx);
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if (WARN_ON(list_empty(&local->roc_list)))
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return;
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roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
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list);
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if (WARN_ON(roc->started))
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return;
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min_dur = roc->duration;
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max_dur = roc->duration;
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type = roc->type;
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list_for_each_entry(tmp, &local->roc_list, list) {
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if (tmp == roc)
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continue;
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if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
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break;
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max_dur = max(tmp->duration, max_dur);
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min_dur = min(tmp->duration, min_dur);
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type = max(tmp->type, type);
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}
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if (local->ops->remain_on_channel) {
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int ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
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max_dur, type);
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if (ret) {
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wiphy_warn(local->hw.wiphy,
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"failed to start next HW ROC (%d)\n", ret);
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/*
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* queue the work struct again to avoid recursion
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* when multiple failures occur
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*/
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list_for_each_entry(tmp, &local->roc_list, list) {
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if (tmp->sdata != roc->sdata ||
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tmp->chan != roc->chan)
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break;
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tmp->started = true;
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tmp->abort = true;
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}
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ieee80211_queue_work(&local->hw, &local->hw_roc_done);
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return;
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}
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/* we'll notify about the start once the HW calls back */
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list_for_each_entry(tmp, &local->roc_list, list) {
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if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
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break;
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tmp->started = true;
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}
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} else {
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/* If actually operating on the desired channel (with at least
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* 20 MHz channel width) don't stop all the operations but still
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* treat it as though the ROC operation started properly, so
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* other ROC operations won't interfere with this one.
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*/
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roc->on_channel = roc->chan == local->_oper_chandef.chan &&
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local->_oper_chandef.width != NL80211_CHAN_WIDTH_5 &&
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local->_oper_chandef.width != NL80211_CHAN_WIDTH_10;
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/* start this ROC */
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ieee80211_recalc_idle(local);
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if (!roc->on_channel) {
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ieee80211_offchannel_stop_vifs(local);
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local->tmp_channel = roc->chan;
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ieee80211_hw_config(local, 0);
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}
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ieee80211_queue_delayed_work(&local->hw, &local->roc_work,
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msecs_to_jiffies(min_dur));
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/* tell userspace or send frame(s) */
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list_for_each_entry(tmp, &local->roc_list, list) {
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if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
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break;
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tmp->on_channel = roc->on_channel;
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ieee80211_handle_roc_started(tmp, jiffies);
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}
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}
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}
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void ieee80211_start_next_roc(struct ieee80211_local *local)
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{
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struct ieee80211_roc_work *roc;
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lockdep_assert_held(&local->mtx);
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if (list_empty(&local->roc_list)) {
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ieee80211_run_deferred_scan(local);
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return;
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}
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/* defer roc if driver is not started (i.e. during reconfig) */
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if (local->in_reconfig)
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return;
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roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
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list);
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if (WARN_ON_ONCE(roc->started))
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return;
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if (local->ops->remain_on_channel) {
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_ieee80211_start_next_roc(local);
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} else {
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/* delay it a bit */
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ieee80211_queue_delayed_work(&local->hw, &local->roc_work,
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round_jiffies_relative(HZ/2));
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}
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}
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static void __ieee80211_roc_work(struct ieee80211_local *local)
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{
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struct ieee80211_roc_work *roc;
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bool on_channel;
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lockdep_assert_held(&local->mtx);
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if (WARN_ON(local->ops->remain_on_channel))
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return;
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roc = list_first_entry_or_null(&local->roc_list,
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struct ieee80211_roc_work, list);
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if (!roc)
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return;
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if (!roc->started) {
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WARN_ON(local->use_chanctx);
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_ieee80211_start_next_roc(local);
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} else {
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on_channel = roc->on_channel;
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if (ieee80211_recalc_sw_work(local, jiffies))
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return;
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/* careful - roc pointer became invalid during recalc */
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if (!on_channel) {
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ieee80211_flush_queues(local, NULL, false);
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local->tmp_channel = NULL;
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ieee80211_hw_config(local, 0);
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ieee80211_offchannel_return(local);
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}
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ieee80211_recalc_idle(local);
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ieee80211_start_next_roc(local);
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}
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}
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static void ieee80211_roc_work(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, roc_work.work);
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mutex_lock(&local->mtx);
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__ieee80211_roc_work(local);
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mutex_unlock(&local->mtx);
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}
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static void ieee80211_hw_roc_done(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_done);
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mutex_lock(&local->mtx);
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ieee80211_end_finished_rocs(local, jiffies);
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/* if there's another roc, start it now */
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ieee80211_start_next_roc(local);
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mutex_unlock(&local->mtx);
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}
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|
|
void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
|
|
trace_api_remain_on_channel_expired(local);
|
|
|
|
ieee80211_queue_work(hw, &local->hw_roc_done);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
|
|
|
|
static bool
|
|
ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local,
|
|
struct ieee80211_roc_work *new_roc,
|
|
struct ieee80211_roc_work *cur_roc)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long remaining;
|
|
|
|
if (WARN_ON(!cur_roc->started))
|
|
return false;
|
|
|
|
/* if it was scheduled in the hardware, but not started yet,
|
|
* we can only combine if the older one had a longer duration
|
|
*/
|
|
if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration)
|
|
return false;
|
|
|
|
remaining = cur_roc->start_time +
|
|
msecs_to_jiffies(cur_roc->duration) -
|
|
now;
|
|
|
|
/* if it doesn't fit entirely, schedule a new one */
|
|
if (new_roc->duration > jiffies_to_msecs(remaining))
|
|
return false;
|
|
|
|
/* add just after the current one so we combine their finish later */
|
|
list_add(&new_roc->list, &cur_roc->list);
|
|
|
|
/* if the existing one has already begun then let this one also
|
|
* begin, otherwise they'll both be marked properly by the work
|
|
* struct that runs once the driver notifies us of the beginning
|
|
*/
|
|
if (cur_roc->hw_begun) {
|
|
new_roc->hw_begun = true;
|
|
ieee80211_handle_roc_started(new_roc, now);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int ieee80211_start_roc_work(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_channel *channel,
|
|
unsigned int duration, u64 *cookie,
|
|
struct sk_buff *txskb,
|
|
enum ieee80211_roc_type type)
|
|
{
|
|
struct ieee80211_roc_work *roc, *tmp;
|
|
bool queued = false, combine_started = true;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&local->mtx);
|
|
|
|
if (local->use_chanctx && !local->ops->remain_on_channel)
|
|
return -EOPNOTSUPP;
|
|
|
|
roc = kzalloc(sizeof(*roc), GFP_KERNEL);
|
|
if (!roc)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* If the duration is zero, then the driver
|
|
* wouldn't actually do anything. Set it to
|
|
* 10 for now.
|
|
*
|
|
* TODO: cancel the off-channel operation
|
|
* when we get the SKB's TX status and
|
|
* the wait time was zero before.
|
|
*/
|
|
if (!duration)
|
|
duration = 10;
|
|
|
|
roc->chan = channel;
|
|
roc->duration = duration;
|
|
roc->req_duration = duration;
|
|
roc->frame = txskb;
|
|
roc->type = type;
|
|
roc->sdata = sdata;
|
|
|
|
/*
|
|
* cookie is either the roc cookie (for normal roc)
|
|
* or the SKB (for mgmt TX)
|
|
*/
|
|
if (!txskb) {
|
|
roc->cookie = ieee80211_mgmt_tx_cookie(local);
|
|
*cookie = roc->cookie;
|
|
} else {
|
|
roc->mgmt_tx_cookie = *cookie;
|
|
}
|
|
|
|
/* if there's no need to queue, handle it immediately */
|
|
if (list_empty(&local->roc_list) &&
|
|
!local->scanning && !ieee80211_is_radar_required(local)) {
|
|
/* if not HW assist, just queue & schedule work */
|
|
if (!local->ops->remain_on_channel) {
|
|
list_add_tail(&roc->list, &local->roc_list);
|
|
ieee80211_queue_delayed_work(&local->hw,
|
|
&local->roc_work, 0);
|
|
} else {
|
|
/* otherwise actually kick it off here
|
|
* (for error handling)
|
|
*/
|
|
ret = drv_remain_on_channel(local, sdata, channel,
|
|
duration, type);
|
|
if (ret) {
|
|
kfree(roc);
|
|
return ret;
|
|
}
|
|
roc->started = true;
|
|
list_add_tail(&roc->list, &local->roc_list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* otherwise handle queueing */
|
|
|
|
list_for_each_entry(tmp, &local->roc_list, list) {
|
|
if (tmp->chan != channel || tmp->sdata != sdata)
|
|
continue;
|
|
|
|
/*
|
|
* Extend this ROC if possible: If it hasn't started, add
|
|
* just after the new one to combine.
|
|
*/
|
|
if (!tmp->started) {
|
|
list_add(&roc->list, &tmp->list);
|
|
queued = true;
|
|
break;
|
|
}
|
|
|
|
if (!combine_started)
|
|
continue;
|
|
|
|
if (!local->ops->remain_on_channel) {
|
|
/* If there's no hardware remain-on-channel, and
|
|
* doing so won't push us over the maximum r-o-c
|
|
* we allow, then we can just add the new one to
|
|
* the list and mark it as having started now.
|
|
* If it would push over the limit, don't try to
|
|
* combine with other started ones (that haven't
|
|
* been running as long) but potentially sort it
|
|
* with others that had the same fate.
|
|
*/
|
|
unsigned long now = jiffies;
|
|
u32 elapsed = jiffies_to_msecs(now - tmp->start_time);
|
|
struct wiphy *wiphy = local->hw.wiphy;
|
|
u32 max_roc = wiphy->max_remain_on_channel_duration;
|
|
|
|
if (elapsed + roc->duration > max_roc) {
|
|
combine_started = false;
|
|
continue;
|
|
}
|
|
|
|
list_add(&roc->list, &tmp->list);
|
|
queued = true;
|
|
roc->on_channel = tmp->on_channel;
|
|
ieee80211_handle_roc_started(roc, now);
|
|
ieee80211_recalc_sw_work(local, now);
|
|
break;
|
|
}
|
|
|
|
queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp);
|
|
if (queued)
|
|
break;
|
|
/* if it wasn't queued, perhaps it can be combined with
|
|
* another that also couldn't get combined previously,
|
|
* but no need to check for already started ones, since
|
|
* that can't work.
|
|
*/
|
|
combine_started = false;
|
|
}
|
|
|
|
if (!queued)
|
|
list_add_tail(&roc->list, &local->roc_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev,
|
|
struct ieee80211_channel *chan,
|
|
unsigned int duration, u64 *cookie)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
|
|
struct ieee80211_local *local = sdata->local;
|
|
int ret;
|
|
|
|
mutex_lock(&local->mtx);
|
|
ret = ieee80211_start_roc_work(local, sdata, chan,
|
|
duration, cookie, NULL,
|
|
IEEE80211_ROC_TYPE_NORMAL);
|
|
mutex_unlock(&local->mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ieee80211_cancel_roc(struct ieee80211_local *local,
|
|
u64 cookie, bool mgmt_tx)
|
|
{
|
|
struct ieee80211_roc_work *roc, *tmp, *found = NULL;
|
|
int ret;
|
|
|
|
if (!cookie)
|
|
return -ENOENT;
|
|
|
|
flush_work(&local->hw_roc_start);
|
|
|
|
mutex_lock(&local->mtx);
|
|
list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
|
|
if (!mgmt_tx && roc->cookie != cookie)
|
|
continue;
|
|
else if (mgmt_tx && roc->mgmt_tx_cookie != cookie)
|
|
continue;
|
|
|
|
found = roc;
|
|
break;
|
|
}
|
|
|
|
if (!found) {
|
|
mutex_unlock(&local->mtx);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (!found->started) {
|
|
ieee80211_roc_notify_destroy(found);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (local->ops->remain_on_channel) {
|
|
ret = drv_cancel_remain_on_channel(local, roc->sdata);
|
|
if (WARN_ON_ONCE(ret)) {
|
|
mutex_unlock(&local->mtx);
|
|
return ret;
|
|
}
|
|
|
|
/* TODO:
|
|
* if multiple items were combined here then we really shouldn't
|
|
* cancel them all - we should wait for as much time as needed
|
|
* for the longest remaining one, and only then cancel ...
|
|
*/
|
|
list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
|
|
if (!roc->started)
|
|
break;
|
|
if (roc == found)
|
|
found = NULL;
|
|
ieee80211_roc_notify_destroy(roc);
|
|
}
|
|
|
|
/* that really must not happen - it was started */
|
|
WARN_ON(found);
|
|
|
|
ieee80211_start_next_roc(local);
|
|
} else {
|
|
/* go through work struct to return to the operating channel */
|
|
found->abort = true;
|
|
mod_delayed_work(local->workqueue, &local->roc_work, 0);
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&local->mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
|
|
struct wireless_dev *wdev, u64 cookie)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
|
|
struct ieee80211_local *local = sdata->local;
|
|
|
|
return ieee80211_cancel_roc(local, cookie, false);
|
|
}
|
|
|
|
int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
|
|
struct cfg80211_mgmt_tx_params *params, u64 *cookie)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct sta_info *sta;
|
|
const struct ieee80211_mgmt *mgmt = (void *)params->buf;
|
|
bool need_offchan = false;
|
|
u32 flags;
|
|
int ret;
|
|
u8 *data;
|
|
|
|
if (params->dont_wait_for_ack)
|
|
flags = IEEE80211_TX_CTL_NO_ACK;
|
|
else
|
|
flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
|
|
IEEE80211_TX_CTL_REQ_TX_STATUS;
|
|
|
|
if (params->no_cck)
|
|
flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
|
|
|
|
switch (sdata->vif.type) {
|
|
case NL80211_IFTYPE_ADHOC:
|
|
if (!sdata->vif.bss_conf.ibss_joined)
|
|
need_offchan = true;
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
/* fall through */
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
if (ieee80211_vif_is_mesh(&sdata->vif) &&
|
|
!sdata->u.mesh.mesh_id_len)
|
|
need_offchan = true;
|
|
#endif
|
|
/* fall through */
|
|
case NL80211_IFTYPE_AP:
|
|
case NL80211_IFTYPE_AP_VLAN:
|
|
case NL80211_IFTYPE_P2P_GO:
|
|
if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
|
|
!ieee80211_vif_is_mesh(&sdata->vif) &&
|
|
!rcu_access_pointer(sdata->bss->beacon))
|
|
need_offchan = true;
|
|
if (!ieee80211_is_action(mgmt->frame_control) ||
|
|
mgmt->u.action.category == WLAN_CATEGORY_PUBLIC ||
|
|
mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED ||
|
|
mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT)
|
|
break;
|
|
rcu_read_lock();
|
|
sta = sta_info_get_bss(sdata, mgmt->da);
|
|
rcu_read_unlock();
|
|
if (!sta)
|
|
return -ENOLINK;
|
|
break;
|
|
case NL80211_IFTYPE_STATION:
|
|
case NL80211_IFTYPE_P2P_CLIENT:
|
|
sdata_lock(sdata);
|
|
if (!sdata->u.mgd.associated ||
|
|
(params->offchan && params->wait &&
|
|
local->ops->remain_on_channel &&
|
|
memcmp(sdata->u.mgd.associated->bssid,
|
|
mgmt->bssid, ETH_ALEN)))
|
|
need_offchan = true;
|
|
sdata_unlock(sdata);
|
|
break;
|
|
case NL80211_IFTYPE_P2P_DEVICE:
|
|
need_offchan = true;
|
|
break;
|
|
case NL80211_IFTYPE_NAN:
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* configurations requiring offchan cannot work if no channel has been
|
|
* specified
|
|
*/
|
|
if (need_offchan && !params->chan)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&local->mtx);
|
|
|
|
/* Check if the operating channel is the requested channel */
|
|
if (!need_offchan) {
|
|
struct ieee80211_chanctx_conf *chanctx_conf;
|
|
|
|
rcu_read_lock();
|
|
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
|
|
|
|
if (chanctx_conf) {
|
|
need_offchan = params->chan &&
|
|
(params->chan !=
|
|
chanctx_conf->def.chan);
|
|
} else if (!params->chan) {
|
|
ret = -EINVAL;
|
|
rcu_read_unlock();
|
|
goto out_unlock;
|
|
} else {
|
|
need_offchan = true;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (need_offchan && !params->offchan) {
|
|
ret = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
|
|
skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len);
|
|
if (!skb) {
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
skb_reserve(skb, local->hw.extra_tx_headroom);
|
|
|
|
data = skb_put_data(skb, params->buf, params->len);
|
|
|
|
/* Update CSA counters */
|
|
if (sdata->vif.csa_active &&
|
|
(sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
|
|
sdata->vif.type == NL80211_IFTYPE_ADHOC) &&
|
|
params->n_csa_offsets) {
|
|
int i;
|
|
struct beacon_data *beacon = NULL;
|
|
|
|
rcu_read_lock();
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP)
|
|
beacon = rcu_dereference(sdata->u.ap.beacon);
|
|
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
|
|
beacon = rcu_dereference(sdata->u.ibss.presp);
|
|
else if (ieee80211_vif_is_mesh(&sdata->vif))
|
|
beacon = rcu_dereference(sdata->u.mesh.beacon);
|
|
|
|
if (beacon)
|
|
for (i = 0; i < params->n_csa_offsets; i++)
|
|
data[params->csa_offsets[i]] =
|
|
beacon->csa_current_counter;
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
IEEE80211_SKB_CB(skb)->flags = flags;
|
|
|
|
skb->dev = sdata->dev;
|
|
|
|
if (!params->dont_wait_for_ack) {
|
|
/* make a copy to preserve the frame contents
|
|
* in case of encryption.
|
|
*/
|
|
ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL);
|
|
if (ret) {
|
|
kfree_skb(skb);
|
|
goto out_unlock;
|
|
}
|
|
} else {
|
|
/* Assign a dummy non-zero cookie, it's not sent to
|
|
* userspace in this case but we rely on its value
|
|
* internally in the need_offchan case to distinguish
|
|
* mgmt-tx from remain-on-channel.
|
|
*/
|
|
*cookie = 0xffffffff;
|
|
}
|
|
|
|
if (!need_offchan) {
|
|
ieee80211_tx_skb(sdata, skb);
|
|
ret = 0;
|
|
goto out_unlock;
|
|
}
|
|
|
|
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN |
|
|
IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
|
|
if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
|
|
IEEE80211_SKB_CB(skb)->hw_queue =
|
|
local->hw.offchannel_tx_hw_queue;
|
|
|
|
/* This will handle all kinds of coalescing and immediate TX */
|
|
ret = ieee80211_start_roc_work(local, sdata, params->chan,
|
|
params->wait, cookie, skb,
|
|
IEEE80211_ROC_TYPE_MGMT_TX);
|
|
if (ret)
|
|
ieee80211_free_txskb(&local->hw, skb);
|
|
out_unlock:
|
|
mutex_unlock(&local->mtx);
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy,
|
|
struct wireless_dev *wdev, u64 cookie)
|
|
{
|
|
struct ieee80211_local *local = wiphy_priv(wiphy);
|
|
|
|
return ieee80211_cancel_roc(local, cookie, true);
|
|
}
|
|
|
|
void ieee80211_roc_setup(struct ieee80211_local *local)
|
|
{
|
|
INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
|
|
INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
|
|
INIT_DELAYED_WORK(&local->roc_work, ieee80211_roc_work);
|
|
INIT_LIST_HEAD(&local->roc_list);
|
|
}
|
|
|
|
void ieee80211_roc_purge(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_roc_work *roc, *tmp;
|
|
bool work_to_do = false;
|
|
|
|
mutex_lock(&local->mtx);
|
|
list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
|
|
if (sdata && roc->sdata != sdata)
|
|
continue;
|
|
|
|
if (roc->started) {
|
|
if (local->ops->remain_on_channel) {
|
|
/* can race, so ignore return value */
|
|
drv_cancel_remain_on_channel(local, sdata);
|
|
ieee80211_roc_notify_destroy(roc);
|
|
} else {
|
|
roc->abort = true;
|
|
work_to_do = true;
|
|
}
|
|
} else {
|
|
ieee80211_roc_notify_destroy(roc);
|
|
}
|
|
}
|
|
if (work_to_do)
|
|
__ieee80211_roc_work(local);
|
|
mutex_unlock(&local->mtx);
|
|
}
|