main.c 32.7 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <net/mac80211.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
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#include <linux/pm_qos.h>
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#include <linux/inetdevice.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>
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#include <net/addrconf.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wep.h"
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#include "led.h"
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#include "cfg.h"
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#include "debugfs.h"
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void ieee80211_configure_filter(struct ieee80211_local *local)
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{
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	u64 mc;
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	unsigned int changed_flags;
	unsigned int new_flags = 0;

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	if (atomic_read(&local->iff_promiscs))
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		new_flags |= FIF_PROMISC_IN_BSS;

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	if (atomic_read(&local->iff_allmultis))
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		new_flags |= FIF_ALLMULTI;

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	if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
	    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
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		new_flags |= FIF_BCN_PRBRESP_PROMISC;

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	if (local->fif_probe_req || local->probe_req_reg)
		new_flags |= FIF_PROBE_REQ;

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	if (local->fif_fcsfail)
		new_flags |= FIF_FCSFAIL;

	if (local->fif_plcpfail)
		new_flags |= FIF_PLCPFAIL;

	if (local->fif_control)
		new_flags |= FIF_CONTROL;

	if (local->fif_other_bss)
		new_flags |= FIF_OTHER_BSS;
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	if (local->fif_pspoll)
		new_flags |= FIF_PSPOLL;

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	spin_lock_bh(&local->filter_lock);
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	changed_flags = local->filter_flags ^ new_flags;

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	mc = drv_prepare_multicast(local, &local->mc_list);
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	spin_unlock_bh(&local->filter_lock);

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	/* be a bit nasty */
	new_flags |= (1<<31);

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	drv_configure_filter(local, changed_flags, &new_flags, mc);
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	WARN_ON(new_flags & (1<<31));

	local->filter_flags = new_flags & ~(1<<31);
}

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static void ieee80211_reconfig_filter(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, reconfig_filter);

	ieee80211_configure_filter(local);
}

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static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
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{
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	struct ieee80211_sub_if_data *sdata;
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	struct cfg80211_chan_def chandef = {};
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	u32 changed = 0;
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	int power;
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	u32 offchannel_flag;
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	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
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	if (local->scan_chandef.chan) {
		chandef = local->scan_chandef;
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	} else if (local->tmp_channel) {
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		chandef.chan = local->tmp_channel;
		chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
		chandef.center_freq1 = chandef.chan->center_freq;
	} else
		chandef = local->_oper_chandef;

	WARN(!cfg80211_chandef_valid(&chandef),
	     "control:%d MHz width:%d center: %d/%d MHz",
	     chandef.chan->center_freq, chandef.width,
	     chandef.center_freq1, chandef.center_freq2);

	if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
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		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
	else
		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;

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	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
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	if (offchannel_flag ||
	    !cfg80211_chandef_identical(&local->hw.conf.chandef,
					&local->_oper_chandef)) {
		local->hw.conf.chandef = chandef;
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		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
	}
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	if (!conf_is_ht(&local->hw.conf)) {
		/*
		 * mac80211.h documents that this is only valid
		 * when the channel is set to an HT type, and
		 * that otherwise STATIC is used.
		 */
		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
	} else if (local->hw.conf.smps_mode != local->smps_mode) {
		local->hw.conf.smps_mode = local->smps_mode;
		changed |= IEEE80211_CONF_CHANGE_SMPS;
	}

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	power = ieee80211_chandef_max_power(&chandef);
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	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!rcu_access_pointer(sdata->vif.chanctx_conf))
			continue;
		power = min(power, sdata->vif.bss_conf.txpower);
	}
	rcu_read_unlock();
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	if (local->hw.conf.power_level != power) {
		changed |= IEEE80211_CONF_CHANGE_POWER;
		local->hw.conf.power_level = power;
	}
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	return changed;
}

int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{
	int ret = 0;

	might_sleep();

	if (!local->use_chanctx)
		changed |= ieee80211_hw_conf_chan(local);
	else
		changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
			     IEEE80211_CONF_CHANGE_POWER);

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	if (changed && local->open_count) {
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		ret = drv_config(local, changed);
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		/*
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		 * Goal:
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		 * HW reconfiguration should never fail, the driver has told
		 * us what it can support so it should live up to that promise.
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		 *
		 * Current status:
		 * rfkill is not integrated with mac80211 and a
		 * configuration command can thus fail if hardware rfkill
		 * is enabled
		 *
		 * FIXME: integrate rfkill with mac80211 and then add this
		 * WARN_ON() back
		 *
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		 */
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		/* WARN_ON(ret); */
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	}
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	return ret;
}
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void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
				      u32 changed)
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{
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	struct ieee80211_local *local = sdata->local;

	if (!changed)
		return;

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	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
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}

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u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
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{
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	sdata->vif.bss_conf.use_cts_prot = false;
	sdata->vif.bss_conf.use_short_preamble = false;
	sdata->vif.bss_conf.use_short_slot = false;
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	return BSS_CHANGED_ERP_CTS_PROT |
	       BSS_CHANGED_ERP_PREAMBLE |
	       BSS_CHANGED_ERP_SLOT;
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}

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static void ieee80211_tasklet_handler(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *) data;
	struct sk_buff *skb;

	while ((skb = skb_dequeue(&local->skb_queue)) ||
	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
		switch (skb->pkt_type) {
		case IEEE80211_RX_MSG:
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			/* Clear skb->pkt_type in order to not confuse kernel
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			 * netstack. */
			skb->pkt_type = 0;
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			ieee80211_rx(&local->hw, skb);
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			break;
		case IEEE80211_TX_STATUS_MSG:
			skb->pkt_type = 0;
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			ieee80211_tx_status(&local->hw, skb);
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			break;
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		default:
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			WARN(1, "mac80211: Packet is of unknown type %d\n",
			     skb->pkt_type);
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			dev_kfree_skb(skb);
			break;
		}
	}
}

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static void ieee80211_restart_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, restart_work);

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	/* wait for scan work complete */
	flush_workqueue(local->workqueue);

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	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
	     "%s called with hardware scan in progress\n", __func__);
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	rtnl_lock();
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	ieee80211_scan_cancel(local);
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	ieee80211_reconfig(local);
	rtnl_unlock();
}

void ieee80211_restart_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

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	trace_api_restart_hw(local);

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	wiphy_info(hw->wiphy,
		   "Hardware restart was requested\n");

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	/* use this reason, ieee80211_reconfig will unblock it */
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	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND);
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	/*
	 * Stop all Rx during the reconfig. We don't want state changes
	 * or driver callbacks while this is in progress.
	 */
	local->in_reconfig = true;
	barrier();

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	schedule_work(&local->restart_work);
}
EXPORT_SYMBOL(ieee80211_restart_hw);

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#ifdef CONFIG_INET
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static int ieee80211_ifa_changed(struct notifier_block *nb,
				 unsigned long data, void *arg)
{
	struct in_ifaddr *ifa = arg;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local,
			     ifa_notifier);
	struct net_device *ndev = ifa->ifa_dev->dev;
	struct wireless_dev *wdev = ndev->ieee80211_ptr;
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	struct in_device *idev;
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	struct ieee80211_sub_if_data *sdata;
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	struct ieee80211_bss_conf *bss_conf;
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	struct ieee80211_if_managed *ifmgd;
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	int c = 0;
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	/* Make sure it's our interface that got changed */
	if (!wdev)
		return NOTIFY_DONE;

	if (wdev->wiphy != local->hw.wiphy)
		return NOTIFY_DONE;

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
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	bss_conf = &sdata->vif.bss_conf;
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	/* ARP filtering is only supported in managed mode */
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return NOTIFY_DONE;

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	idev = __in_dev_get_rtnl(sdata->dev);
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	if (!idev)
		return NOTIFY_DONE;

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	ifmgd = &sdata->u.mgd;
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	sdata_lock(sdata);
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	/* Copy the addresses to the bss_conf list */
	ifa = idev->ifa_list;
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	while (ifa) {
		if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
			bss_conf->arp_addr_list[c] = ifa->ifa_address;
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		ifa = ifa->ifa_next;
		c++;
	}

	bss_conf->arp_addr_cnt = c;

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	/* Configure driver only if associated (which also implies it is up) */
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	if (ifmgd->associated)
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		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_ARP_FILTER);

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	sdata_unlock(sdata);
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	return NOTIFY_OK;
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}
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
static int ieee80211_ifa6_changed(struct notifier_block *nb,
				  unsigned long data, void *arg)
{
	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
	struct inet6_dev *idev = ifa->idev;
	struct net_device *ndev = ifa->idev->dev;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local, ifa6_notifier);
	struct wireless_dev *wdev = ndev->ieee80211_ptr;
	struct ieee80211_sub_if_data *sdata;

	/* Make sure it's our interface that got changed */
	if (!wdev || wdev->wiphy != local->hw.wiphy)
		return NOTIFY_DONE;

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);

	/*
	 * For now only support station mode. This is mostly because
	 * doing AP would have to handle AP_VLAN in some way ...
	 */
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return NOTIFY_DONE;

	drv_ipv6_addr_change(local, sdata, idev);

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	return NOTIFY_OK;
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}
#endif

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/* There isn't a lot of sense in it, but you can transmit anything you like */
static const struct ieee80211_txrx_stypes
ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
	[NL80211_IFTYPE_ADHOC] = {
		.tx = 0xffff,
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		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
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			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
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	},
	[NL80211_IFTYPE_STATION] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
	},
	[NL80211_IFTYPE_AP] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_AP_VLAN] = {
		/* copy AP */
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
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			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_P2P_CLIENT] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
	},
	[NL80211_IFTYPE_P2P_GO] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
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			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
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	[NL80211_IFTYPE_MESH_POINT] = {
		.tx = 0xffff,
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		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4),
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	},
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	[NL80211_IFTYPE_P2P_DEVICE] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
	},
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};

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static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
			     IEEE80211_HT_AMPDU_PARM_DENSITY,

	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
				IEEE80211_HT_CAP_MAX_AMSDU |
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				IEEE80211_HT_CAP_SGI_20 |
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				IEEE80211_HT_CAP_SGI_40 |
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				IEEE80211_HT_CAP_LDPC_CODING |
				IEEE80211_HT_CAP_40MHZ_INTOLERANT),
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	.mcs = {
		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
			     0xff, 0xff, 0xff, 0xff, 0xff, },
	},
};

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static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
	.vht_cap_info =
		cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
			    IEEE80211_VHT_CAP_SHORT_GI_80 |
			    IEEE80211_VHT_CAP_SHORT_GI_160 |
			    IEEE80211_VHT_CAP_RXSTBC_1 |
			    IEEE80211_VHT_CAP_RXSTBC_2 |
			    IEEE80211_VHT_CAP_RXSTBC_3 |
			    IEEE80211_VHT_CAP_RXSTBC_4 |
			    IEEE80211_VHT_CAP_TXSTBC |
			    IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
			    IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
			    IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
			    IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
			    IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
	.supp_mcs = {
		.rx_mcs_map = cpu_to_le16(~0),
		.tx_mcs_map = cpu_to_le16(~0),
	},
};

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static const u8 extended_capabilities[] = {
	0, 0, 0, 0, 0, 0, 0,
	WLAN_EXT_CAPA8_OPMODE_NOTIF,
};

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struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
					const struct ieee80211_ops *ops)
{
	struct ieee80211_local *local;
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	int priv_size, i;
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	struct wiphy *wiphy;
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	bool use_chanctx;
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	if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
		    !ops->add_interface || !ops->remove_interface ||
		    !ops->configure_filter))
		return NULL;

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	if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
		return NULL;

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	/* check all or no channel context operations exist */
	i = !!ops->add_chanctx + !!ops->remove_chanctx +
	    !!ops->change_chanctx + !!ops->assign_vif_chanctx +
	    !!ops->unassign_vif_chanctx;
	if (WARN_ON(i != 0 && i != 5))
		return NULL;
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	use_chanctx = i == 5;
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	/* Ensure 32-byte alignment of our private data and hw private data.
	 * We use the wiphy priv data for both our ieee80211_local and for
	 * the driver's private data
	 *
	 * In memory it'll be like this:
	 *
	 * +-------------------------+
	 * | struct wiphy	    |
	 * +-------------------------+
	 * | struct ieee80211_local  |
	 * +-------------------------+
	 * | driver's private data   |
	 * +-------------------------+
	 *
	 */
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	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
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	wiphy = wiphy_new(&mac80211_config_ops, priv_size);

	if (!wiphy)
		return NULL;

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	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;

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	wiphy->privid = mac80211_wiphy_privid;

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	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
			WIPHY_FLAG_4ADDR_AP |
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			WIPHY_FLAG_4ADDR_STATION |
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			WIPHY_FLAG_REPORTS_OBSS |
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			WIPHY_FLAG_OFFCHAN_TX;

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	wiphy->extended_capabilities = extended_capabilities;
	wiphy->extended_capabilities_mask = extended_capabilities;
	wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);

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	if (ops->remain_on_channel)
		wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
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	wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
			   NL80211_FEATURE_SAE |
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			   NL80211_FEATURE_HT_IBSS |
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			   NL80211_FEATURE_VIF_TXPOWER |
			   NL80211_FEATURE_USERSPACE_MPM;
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	if (!ops->hw_scan)
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		wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
				   NL80211_FEATURE_AP_SCAN;

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	if (!ops->set_key)
		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
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	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
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	local = wiphy_priv(wiphy);
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	local->hw.wiphy = wiphy;

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	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
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	local->ops = ops;
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	local->use_chanctx = use_chanctx;
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	/* set up some defaults */
	local->hw.queues = 1;
	local->hw.max_rates = 1;
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	local->hw.max_report_rates = 0;
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	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
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	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
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	local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
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	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
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	local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
					 IEEE80211_RADIOTAP_MCS_HAVE_GI |
					 IEEE80211_RADIOTAP_MCS_HAVE_BW;
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	local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
					 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
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	local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
	local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
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	local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
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	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
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	wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
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	INIT_LIST_HEAD(&local->interfaces);
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	__hw_addr_init(&local->mc_list);

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	mutex_init(&local->iflist_mtx);
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	mutex_init(&local->mtx);
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	mutex_init(&local->key_mtx);
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	spin_lock_init(&local->filter_lock);
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	spin_lock_init(&local->rx_path_lock);
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	spin_lock_init(&local->queue_stop_reason_lock);

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	INIT_LIST_HEAD(&local->chanctx_list);
	mutex_init(&local->chanctx_mtx);

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	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
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	INIT_WORK(&local->restart_work, ieee80211_restart_work);

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	INIT_WORK(&local->radar_detected_work,
		  ieee80211_dfs_radar_detected_work);

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	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
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	local->smps_mode = IEEE80211_SMPS_OFF;
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	INIT_WORK(&local->dynamic_ps_enable_work,
		  ieee80211_dynamic_ps_enable_work);
	INIT_WORK(&local->dynamic_ps_disable_work,
		  ieee80211_dynamic_ps_disable_work);
	setup_timer(&local->dynamic_ps_timer,
		    ieee80211_dynamic_ps_timer, (unsigned long) local);

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	INIT_WORK(&local->sched_scan_stopped_work,
		  ieee80211_sched_scan_stopped_work);

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	spin_lock_init(&local->ack_status_lock);
	idr_init(&local->ack_status_frames);

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	sta_info_init(local);

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	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
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		skb_queue_head_init(&local->pending[i]);
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		atomic_set(&local->agg_queue_stop[i], 0);
	}
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	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
		     (unsigned long)local);

	tasklet_init(&local->tasklet,
		     ieee80211_tasklet_handler,
		     (unsigned long) local);

	skb_queue_head_init(&local->skb_queue);
	skb_queue_head_init(&local->skb_queue_unreliable);

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	ieee80211_led_names(local);

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	ieee80211_roc_setup(local);
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	return &local->hw;
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}
EXPORT_SYMBOL(ieee80211_alloc_hw);

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static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
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{
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	bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
			  IS_ERR(local->wep_rx_tfm));
	bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE;
	const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes;
	int n_suites = 0, r = 0, w = 0;
	u32 *suites;
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	static const u32 cipher_suites[] = {
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		/* keep WEP first, it may be removed below */
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		WLAN_CIPHER_SUITE_WEP40,
		WLAN_CIPHER_SUITE_WEP104,
		WLAN_CIPHER_SUITE_TKIP,
		WLAN_CIPHER_SUITE_CCMP,

		/* keep last -- depends on hw flags! */
		WLAN_CIPHER_SUITE_AES_CMAC
	};
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	/* Driver specifies the ciphers, we have nothing to do... */
	if (local->hw.wiphy->cipher_suites && have_wep)
		return 0;

	/* Set up cipher suites if driver relies on mac80211 cipher defs */
	if (!local->hw.wiphy->cipher_suites && !cs) {
		local->hw.wiphy->cipher_suites = cipher_suites;
		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);

		if (!have_mfp)
			local->hw.wiphy->n_cipher_suites--;

		if (!have_wep) {
			local->hw.wiphy->cipher_suites += 2;
			local->hw.wiphy->n_cipher_suites -= 2;
		}

		return 0;
	}

	if (!local->hw.wiphy->cipher_suites) {
		/*
		 * Driver specifies cipher schemes only
		 * We start counting ciphers defined by schemes, TKIP and CCMP
		 */
		n_suites = local->hw.n_cipher_schemes + 2;

		/* check if we have WEP40 and WEP104 */
		if (have_wep)
			n_suites += 2;

		/* check if we have AES_CMAC */
		if (have_mfp)
			n_suites++;

		suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
		if (!suites)
			return -ENOMEM;

		suites[w++] = WLAN_CIPHER_SUITE_CCMP;
		suites[w++] = WLAN_CIPHER_SUITE_TKIP;

		if (have_wep) {
			suites[w++] = WLAN_CIPHER_SUITE_WEP40;
			suites[w++] = WLAN_CIPHER_SUITE_WEP104;
		}

		if (have_mfp)
			suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;

		for (r = 0; r < local->hw.n_cipher_schemes; r++)
			suites[w++] = cs[r].cipher;
	} else {
		/* Driver provides cipher suites, but we need to exclude WEP */
		suites = kmemdup(local->hw.wiphy->cipher_suites,
				 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
				 GFP_KERNEL);
		if (!suites)
			return -ENOMEM;

		for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
			u32 suite = local->hw.wiphy->cipher_suites[r];

			if (suite == WLAN_CIPHER_SUITE_WEP40 ||
			    suite == WLAN_CIPHER_SUITE_WEP104)
				continue;
			suites[w++] = suite;
		}
	}

	local->hw.wiphy->cipher_suites = suites;
	local->hw.wiphy->n_cipher_suites = w;
	local->wiphy_ciphers_allocated = true;

	return 0;
}

int ieee80211_register_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);
	int result, i;
	enum ieee80211_band band;
	int channels, max_bitrates;
	bool supp_ht, supp_vht;
	netdev_features_t feature_whitelist;
	struct cfg80211_chan_def dflt_chandef = {};

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	if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
	    (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
	     local->hw.offchannel_tx_hw_queue >= local->hw.queues))
		return -EINVAL;

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#ifdef CONFIG_PM
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	if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
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		return -EINVAL;
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#endif
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	if (!local->use_chanctx) {
		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
			const struct ieee80211_iface_combination *comb;

			comb = &local->hw.wiphy->iface_combinations[i];

			if (comb->num_different_channels > 1)
				return -EINVAL;
		}
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	} else {
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		/*
		 * WDS is currently prohibited when channel contexts are used
		 * because there's no clear definition of which channel WDS
		 * type interfaces use
		 */
		if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
			return -EINVAL;
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		/* DFS currently not supported with channel context drivers */
		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
			const struct ieee80211_iface_combination *comb;

			comb = &local->hw.wiphy->iface_combinations[i];

			if (comb->radar_detect_widths)
				return -EINVAL;
		}
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	}

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	/* Only HW csum features are currently compatible with mac80211 */
	feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
			    NETIF_F_HW_CSUM;
	if (WARN_ON(hw->netdev_features & ~feature_whitelist))
		return -EINVAL;

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	if (hw->max_report_rates == 0)
		hw->max_report_rates = hw->max_rates;

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	local->rx_chains = 1;

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	/*
	 * generic code guarantees at least one band,
	 * set this very early because much code assumes
	 * that hw.conf.channel is assigned
	 */
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	channels = 0;
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	max_bitrates = 0;
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	supp_ht = false;
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	supp_vht = false;
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	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[band];
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		if (!sband)
			continue;
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		if (!dflt_chandef.chan) {
			cfg80211_chandef_create(&dflt_chandef,
						&sband->channels[0],
						NL80211_CHAN_NO_HT);
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			/* init channel we're on */
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			if (!local->use_chanctx && !local->_oper_chandef.chan) {
				local->hw.conf.chandef = dflt_chandef;
				local->_oper_chandef = dflt_chandef;
			}
			local->monitor_chandef = dflt_chandef;
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		}
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		channels += sband->n_channels;

		if (max_bitrates < sband->n_bitrates)
			max_bitrates = sband->n_bitrates;
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		supp_ht = supp_ht || sband->ht_cap.ht_supported;
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		supp_vht = supp_vht || sband->vht_cap.vht_supported;
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		if (sband->ht_cap.ht_supported)
			local->rx_chains =
				max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
				    local->rx_chains);

		/* TODO: consider VHT for RX chains, hopefully it's the same */
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	}
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	/* if low-level driver supports AP, we also support VLAN */
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	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
	}
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	/* mac80211 always supports monitor */
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	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);

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	/* mac80211 doesn't support more than one IBSS interface right now */
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	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
		const struct ieee80211_iface_combination *c;
		int j;

		c = &hw->wiphy->iface_combinations[i];

		for (j = 0; j < c->n_limits; j++)
			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
			    c->limits[j].max > 1)
				return -EINVAL;
	}

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	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
				      sizeof(void *) * channels, GFP_KERNEL);
	if (!local->int_scan_req)
		return -ENOMEM;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		if (!local->hw.wiphy->bands[band])
			continue;
		local->int_scan_req->rates[band] = (u32) -1;
	}

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#ifndef CONFIG_MAC80211_MESH
	/* mesh depends on Kconfig, but drivers should set it if they want */
	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
#endif

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	/* if the underlying driver supports mesh, mac80211 will (at least)
	 * provide routing of mesh authentication frames to userspace */
	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;

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	/* mac80211 supports control port protocol changing */
	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;

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	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
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		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
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	} else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {
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		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
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		if (hw->max_signal <= 0) {
			result = -EINVAL;
			goto fail_wiphy_register;
		}
	}
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	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");

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	/*
	 * Calculate scan IE length -- we need this to alloc
	 * memory and to subtract from the driver limit. It
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	 * includes the DS Params, (extended) supported rates, and HT
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	 * information -- SSID is the driver's responsibility.
	 */
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	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
		3 /* DS Params */;
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	if (supp_ht)
		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
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	if (supp_vht)
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		local->scan_ies_len +=
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			2 + sizeof(struct ieee80211_vht_cap);
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	if (!local->ops->hw_scan) {
		/* For hw_scan, driver needs to set these up. */
		local->hw.wiphy->max_scan_ssids = 4;
		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
	}

	/*
	 * If the driver supports any scan IEs, then assume the
	 * limit includes the IEs mac80211 will add, otherwise
	 * leave it at zero and let the driver sort it out; we
	 * still pass our IEs to the driver but userspace will
	 * not be allowed to in that case.
	 */
	if (local->hw.wiphy->max_scan_ie_len)
		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;

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	WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
					 local->hw.n_cipher_schemes));

	result = ieee80211_init_cipher_suites(local);
	if (result < 0)
		goto fail_wiphy_register;
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	if (!local->ops->remain_on_channel)
		local->hw.wiphy->max_remain_on_channel_duration = 5000;
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	/* mac80211 based drivers don't support internal TDLS setup */
	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;

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	result = wiphy_register(local->hw.wiphy);
	if (result < 0)
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		goto fail_wiphy_register;
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	/*
	 * We use the number of queues for feature tests (QoS, HT) internally
	 * so restrict them appropriately.
	 */
	if (hw->queues > IEEE80211_MAX_QUEUES)
		hw->queues = IEEE80211_MAX_QUEUES;

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		alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
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	if (!local->workqueue) {
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		result = -ENOMEM;
		goto fail_workqueue;
	}

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	/*
	 * The hardware needs headroom for sending the frame,
	 * and we need some headroom for passing the frame to monitor
	 * interfaces, but never both at the same time.
	 */
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	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
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				   IEEE80211_TX_STATUS_HEADROOM);
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	debugfs_hw_add(local);

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	/*
	 * if the driver doesn't specify a max listen interval we
	 * use 5 which should be a safe default
	 */
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	if (local->hw.max_listen_interval == 0)
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		local->hw.max_listen_interval = 5;
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	local->hw.conf.listen_interval = local->hw.max_listen_interval;

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	local->dynamic_ps_forced_timeout = -1;
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	result = ieee80211_wep_init(local);
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	if (result < 0)
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		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
			    result);
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	local->hw.conf.flags = IEEE80211_CONF_IDLE;

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	ieee80211_led_init(local);

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	rtnl_lock();

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	result = ieee80211_init_rate_ctrl_alg(local,
					      hw->rate_control_algorithm);
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	if (result < 0) {
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		wiphy_debug(local->hw.wiphy,
			    "Failed to initialize rate control algorithm\n");
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		goto fail_rate;
	}

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	/* add one default STA interface if supported */
	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
		result = ieee80211_if_add(local, "wlan%d", NULL,
					  NL80211_IFTYPE_STATION, NULL);
		if (result)
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			wiphy_warn(local->hw.wiphy,
				   "Failed to add default virtual iface\n");
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	}
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	rtnl_unlock();

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	local->network_latency_notifier.notifier_call =
		ieee80211_max_network_latency;
	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
				     &local->network_latency_notifier);
	if (result) {
		rtnl_lock();
		goto fail_pm_qos;
	}

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#ifdef CONFIG_INET
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	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
	result = register_inetaddr_notifier(&local->ifa_notifier);
	if (result)
		goto fail_ifa;
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
	local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
	result = register_inet6addr_notifier(&local->ifa6_notifier);
	if (result)
		goto fail_ifa6;
#endif

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	return 0;

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#if IS_ENABLED(CONFIG_IPV6)
 fail_ifa6:
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#ifdef CONFIG_INET
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	unregister_inetaddr_notifier(&local->ifa_notifier);
#endif
#endif
#if defined(CONFIG_INET) || defined(CONFIG_IPV6)
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 fail_ifa:
	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
			       &local->network_latency_notifier);
	rtnl_lock();
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#endif
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 fail_pm_qos:
	ieee80211_led_exit(local);
	ieee80211_remove_interfaces(local);
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	rtnl_unlock();
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	ieee80211_wep_free(local);
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	sta_info_stop(local);
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	destroy_workqueue(local->workqueue);
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 fail_workqueue:
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	wiphy_unregister(local->hw.wiphy);
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 fail_wiphy_register:
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	if (local->wiphy_ciphers_allocated)
		kfree(local->hw.wiphy->cipher_suites);
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	kfree(local->int_scan_req);
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	return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);

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void ieee80211_napi_add(struct ieee80211_hw *hw, struct napi_struct *napi,
			struct net_device *napi_dev,
			int (*poll)(struct napi_struct *, int),
			int weight)
{
	struct ieee80211_local *local = hw_to_local(hw);

	netif_napi_add(napi_dev, napi, poll, weight);
	local->napi = napi;
}
EXPORT_SYMBOL_GPL(ieee80211_napi_add);

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void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	tasklet_kill(&local->tx_pending_tasklet);
	tasklet_kill(&local->tasklet);

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	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
			       &local->network_latency_notifier);
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	unregister_inetaddr_notifier(&local->ifa_notifier);
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
	unregister_inet6addr_notifier(&local->ifa6_notifier);
#endif
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	rtnl_lock();

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	/*
	 * At this point, interface list manipulations are fine
	 * because the driver cannot be handing us frames any
	 * more and the tasklet is killed.
	 */
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	ieee80211_remove_interfaces(local);
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	rtnl_unlock();

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	cancel_work_sync(&local->restart_work);
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	cancel_work_sync(&local->reconfig_filter);
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	flush_work(&local->sched_scan_stopped_work);
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	ieee80211_clear_tx_pending(local);
	rate_control_deinitialize(local);

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	if (skb_queue_len(&local->skb_queue) ||
	    skb_queue_len(&local->skb_queue_unreliable))
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		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
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	skb_queue_purge(&local->skb_queue);
	skb_queue_purge(&local->skb_queue_unreliable);

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	destroy_workqueue(local->workqueue);
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	wiphy_unregister(local->hw.wiphy);
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	sta_info_stop(local);
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	ieee80211_wep_free(local);
	ieee80211_led_exit(local);
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	kfree(local->int_scan_req);
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}
EXPORT_SYMBOL(ieee80211_unregister_hw);

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static int ieee80211_free_ack_frame(int id, void *p, void *data)
{
	WARN_ONCE(1, "Have pending ack frames!\n");
	kfree_skb(p);
	return 0;
}

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void ieee80211_free_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

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	mutex_destroy(&local->iflist_mtx);
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	mutex_destroy(&local->mtx);
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	if (local->wiphy_ciphers_allocated)
		kfree(local->hw.wiphy->cipher_suites);

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	idr_for_each(&local->ack_status_frames,
		     ieee80211_free_ack_frame, NULL);
	idr_destroy(&local->ack_status_frames);

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	kfree(rcu_access_pointer(local->tx_latency));

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