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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>
#include <linux/pm_qos.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wep.h"
#include "led.h"
#include "cfg.h"
#include "debugfs.h"

static struct lock_class_key ieee80211_rx_skb_queue_class;

void ieee80211_configure_filter(struct ieee80211_local *local)
{
u64 mc;
unsigned int changed_flags;
unsigned int new_flags = 0;

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

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

if (local->monitors || local->scanning)
new_flags |= FIF_BCN_PRBRESP_PROMISC;

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

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;

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

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

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

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

drv_configure_filter(local, changed_flags, &new_flags, mc);

WARN_ON(new_flags & (1<<31));

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

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);
}

int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{
struct ieee80211_channel *chan, *scan_chan;
int ret = 0;
int power;
enum nl80211_channel_type channel_type;
u32 offchannel_flag;

might_sleep();

scan_chan = local->scan_channel;

offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
if (scan_chan) {
chan = scan_chan;
/* If scanning on oper channel, use whatever channel-type
* is currently in use.
*/
if (chan == local->oper_channel)
channel_type = local->_oper_channel_type;
else
channel_type = NL80211_CHAN_NO_HT;
local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
} else if (local->tmp_channel &&
local->oper_channel != local->tmp_channel) {
chan = scan_chan = local->tmp_channel;
channel_type = local->tmp_channel_type;
local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
} else {
chan = local->oper_channel;
channel_type = local->_oper_channel_type;
local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
}

offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

if (offchannel_flag || chan != local->hw.conf.channel ||
channel_type != local->hw.conf.channel_type) {
local->hw.conf.channel = chan;
local->hw.conf.channel_type = channel_type;
changed |= IEEE80211_CONF_CHANGE_CHANNEL;
}

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;
}

if ((local->scanning & SCAN_SW_SCANNING) ||
(local->scanning & SCAN_HW_SCANNING))
power = chan->max_power;
else
power = local->power_constr_level ?
(chan->max_power - local->power_constr_level) :
chan->max_power;

if (local->user_power_level >= 0)
power = min(power, local->user_power_level);

if (local->hw.conf.power_level != power) {
changed |= IEEE80211_CONF_CHANGE_POWER;
local->hw.conf.power_level = power;
}

if (changed && local->open_count) {
ret = drv_config(local, changed);
/*
* Goal:
* HW reconfiguration should never fail, the driver has told
* us what it can support so it should live up to that promise.
*
* 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
*
*/
/* WARN_ON(ret); */
}

return ret;
}

void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
u32 changed)
{
struct ieee80211_local *local = sdata->local;
static const u8 zero[ETH_ALEN] = { 0 };

if (!changed)
return;

if (sdata->vif.type == NL80211_IFTYPE_STATION) {
/*
* While not associated, claim a BSSID of all-zeroes
* so that drivers don't do any weird things with the
* BSSID at that time.
*/
if (sdata->vif.bss_conf.assoc)
sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
else
sdata->vif.bss_conf.bssid = zero;
} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
else if (sdata->vif.type == NL80211_IFTYPE_AP)
sdata->vif.bss_conf.bssid = sdata->vif.addr;
else if (sdata->vif.type == NL80211_IFTYPE_WDS)
sdata->vif.bss_conf.bssid = NULL;
else if (ieee80211_vif_is_mesh(&sdata->vif)) {
sdata->vif.bss_conf.bssid = zero;
} else {
WARN_ON(1);
return;
}

switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MESH_POINT:
break;
default:
/* do not warn to simplify caller in scan.c */
changed &= ~BSS_CHANGED_BEACON_ENABLED;
if (WARN_ON(changed & BSS_CHANGED_BEACON))
return;
break;
}

if (changed & BSS_CHANGED_BEACON_ENABLED) {
if (local->quiescing || !ieee80211_sdata_running(sdata) ||
test_bit(SCAN_SW_SCANNING, &local->scanning)) {
sdata->vif.bss_conf.enable_beacon = false;
} else {
/*
* Beacon should be enabled, but AP mode must
* check whether there is a beacon configured.
*/
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
sdata->vif.bss_conf.enable_beacon =
!!sdata->u.ap.beacon;
break;
case NL80211_IFTYPE_ADHOC:
sdata->vif.bss_conf.enable_beacon =
!!sdata->u.ibss.presp;
break;
#ifdef CONFIG_MAC80211_MESH
case NL80211_IFTYPE_MESH_POINT:
sdata->vif.bss_conf.enable_beacon =
!!sdata->u.mesh.mesh_id_len;
break;
#endif
default:
/* not reached */
WARN_ON(1);
break;
}
}
}

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

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

static void ieee80211_tasklet_handler(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sta_info *sta, *tmp;
struct skb_eosp_msg_data *eosp_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:
/* Clear skb->pkt_type in order to not confuse kernel
* netstack. */
skb->pkt_type = 0;
ieee80211_rx(local_to_hw(local), skb);
break;
case IEEE80211_TX_STATUS_MSG:
skb->pkt_type = 0;
ieee80211_tx_status(local_to_hw(local), skb);
break;
case IEEE80211_EOSP_MSG:
eosp_data = (void *)skb->cb;
for_each_sta_info(local, eosp_data->sta, sta, tmp) {
/* skip wrong virtual interface */
if (memcmp(eosp_data->iface,
sta->sdata->vif.addr, ETH_ALEN))
continue;
clear_sta_flag(sta, WLAN_STA_SP);
break;
}
dev_kfree_skb(skb);
break;
default:
WARN(1, "mac80211: Packet is of unknown type %d\n",
skb->pkt_type);
dev_kfree_skb(skb);
break;
}
}
}

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

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

mutex_lock(&local->mtx);
WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
local->sched_scanning,
"%s called with hardware scan in progress\n", __func__);
mutex_unlock(&local->mtx);

rtnl_lock();
ieee80211_scan_cancel(local);
ieee80211_reconfig(local);
rtnl_unlock();
}

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

trace_api_restart_hw(local);

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

/* use this reason, ieee80211_reconfig will unblock it */
ieee80211_stop_queues_by_reason(hw,
IEEE80211_QUEUE_STOP_REASON_SUSPEND);

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

static void ieee80211_recalc_smps_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, recalc_smps);

mutex_lock(&local->iflist_mtx);
ieee80211_recalc_smps(local);
mutex_unlock(&local->iflist_mtx);
}

#ifdef CONFIG_INET
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;
struct in_device *idev;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_bss_conf *bss_conf;
struct ieee80211_if_managed *ifmgd;
int c = 0;

/* 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);
bss_conf = &sdata->vif.bss_conf;

if (!ieee80211_sdata_running(sdata))
return NOTIFY_DONE;

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

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

ifmgd = &sdata->u.mgd;
mutex_lock(&ifmgd->mtx);

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

/* If not all addresses fit the list, disable filtering */
if (ifa) {
sdata->arp_filter_state = false;
c = 0;
} else {
sdata->arp_filter_state = true;
}
bss_conf->arp_addr_cnt = c;

/* Configure driver only if associated */
if (ifmgd->associated) {
bss_conf->arp_filter_enabled = sdata->arp_filter_state;
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_ARP_FILTER);
}

mutex_unlock(&ifmgd->mtx);

return NOTIFY_DONE;
}
#endif

static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
{
struct ieee80211_local *local =
container_of(napi, struct ieee80211_local, napi);

return local->ops->napi_poll(&local->hw, budget);
}

void ieee80211_napi_schedule(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);

napi_schedule(&local->napi);
}
EXPORT_SYMBOL(ieee80211_napi_schedule);

void ieee80211_napi_complete(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);

napi_complete(&local->napi);
}
EXPORT_SYMBOL(ieee80211_napi_complete);

/* 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,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
},
[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) |
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) |
BIT(IEEE80211_STYPE_DISASSOC >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4) |
BIT(IEEE80211_STYPE_ACTION >> 4),
},
[NL80211_IFTYPE_MESH_POINT] = {
.tx = 0xffff,
.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
BIT(IEEE80211_STYPE_AUTH >> 4) |
BIT(IEEE80211_STYPE_DEAUTH >> 4),
},
};

struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
const struct ieee80211_ops *ops)
{
struct ieee80211_local *local;
int priv_size, i;
struct wiphy *wiphy;

/* 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 |
* +-------------------------+
*
*/
priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;

wiphy = wiphy_new(&mac80211_config_ops, priv_size);

if (!wiphy)
return NULL;

wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;

wiphy->privid = mac80211_wiphy_privid;

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

if (!ops->set_key)
wiphy->flags |= WIPHY_FLAG_IBSS_RSN;

wiphy->bss_priv_size = sizeof(struct ieee80211_bss);

local = wiphy_priv(wiphy);

local->hw.wiphy = wiphy;

local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);

BUG_ON(!ops->tx);
BUG_ON(!ops->start);
BUG_ON(!ops->stop);
BUG_ON(!ops->config);
BUG_ON(!ops->add_interface);
BUG_ON(!ops->remove_interface);
BUG_ON(!ops->configure_filter);
local->ops = ops;

/* set up some defaults */
local->hw.queues = 1;
local->hw.max_rates = 1;
local->hw.max_report_rates = 0;
local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
local->user_power_level = -1;
local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;

INIT_LIST_HEAD(&local->interfaces);

__hw_addr_init(&local->mc_list);

mutex_init(&local->iflist_mtx);
mutex_init(&local->mtx);

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

/*
* The rx_skb_queue is only accessed from tasklets,
* but other SKB queues are used from within IRQ
* context. Therefore, this one needs a different
* locking class so our direct, non-irq-safe use of
* the queue's lock doesn't throw lockdep warnings.
*/
skb_queue_head_init_class(&local->rx_skb_queue,
&ieee80211_rx_skb_queue_class);

INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);

ieee80211_work_init(local);

INIT_WORK(&local->restart_work, ieee80211_restart_work);

INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
local->smps_mode = IEEE80211_SMPS_OFF;

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);

INIT_WORK(&local->sched_scan_stopped_work,
ieee80211_sched_scan_stopped_work);

sta_info_init(local);

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

/* init dummy netdev for use w/ NAPI */
init_dummy_netdev(&local->napi_dev);

ieee80211_led_names(local);

ieee80211_hw_roc_setup(local);

return local_to_hw(local);
}
EXPORT_SYMBOL(ieee80211_alloc_hw);

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;
static const u32 cipher_suites[] = {
/* keep WEP first, it may be removed below */
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
};

if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
#ifdef CONFIG_PM
&& (!local->ops->suspend || !local->ops->resume)
#endif
)
return -EINVAL;

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

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

sband = local->hw.wiphy->bands[band];
if (!sband)
continue;
if (!local->oper_channel) {
/* init channel we're on */
local->hw.conf.channel =
local->oper_channel = &sband->channels[0];
local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
}
channels += sband->n_channels;

if (max_bitrates < sband->n_bitrates)
max_bitrates = sband->n_bitrates;
supp_ht = supp_ht || sband->ht_cap.ht_supported;
}

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;
}

/* if low-level driver supports AP, we also support VLAN */
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);
}

/* mac80211 always supports monitor */
hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);

/*
* mac80211 doesn't support more than 1 channel, and also not more
* than one IBSS interface
*/
for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *c;
int j;

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

if (c->num_different_channels > 1)
return -EINVAL;

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

#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

/* 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;

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

if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;

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");

/*
* Calculate scan IE length -- we need this to alloc
* memory and to subtract from the driver limit. It
* includes the DS Params, (extended) supported rates, and HT
* information -- SSID is the driver's responsibility.
*/
local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
3 /* DS Params */;
if (supp_ht)
local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);

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;

/* Set up cipher suites unless driver already did */
if (!local->hw.wiphy->cipher_suites) {
local->hw.wiphy->cipher_suites = cipher_suites;
local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
local->hw.wiphy->n_cipher_suites--;
}
if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
if (local->hw.wiphy->cipher_suites == cipher_suites) {
local->hw.wiphy->cipher_suites += 2;
local->hw.wiphy->n_cipher_suites -= 2;
} else {
u32 *suites;
int r, w = 0;

/* Filter out 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;
}
}

if (!local->ops->remain_on_channel)
local->hw.wiphy->max_remain_on_channel_duration = 5000;

if (local->ops->sched_scan_start)
local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;

/* 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;

result = wiphy_register(local->hw.wiphy);
if (result < 0)
goto fail_wiphy_register;

/*
* 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;

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

/*
* 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.
*/
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
IEEE80211_TX_STATUS_HEADROOM);

debugfs_hw_add(local);

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

local->hw.conf.listen_interval = local->hw.max_listen_interval;

local->dynamic_ps_forced_timeout = -1;

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

ieee80211_led_init(local);

rtnl_lock();

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

/* 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)
wiphy_warn(local->hw.wiphy,
"Failed to add default virtual iface\n");
}

rtnl_unlock();

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;
}

#ifdef CONFIG_INET
local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
result = register_inetaddr_notifier(&local->ifa_notifier);
if (result)
goto fail_ifa;
#endif

netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
local->hw.napi_weight);

return 0;

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

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);

pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
&local->network_latency_notifier);
#ifdef CONFIG_INET
unregister_inetaddr_notifier(&local->ifa_notifier);
#endif

rtnl_lock();

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

rtnl_unlock();

/*
* Now all work items will be gone, but the
* timer might still be armed, so delete it
*/
del_timer_sync(&local->work_timer);

cancel_work_sync(&local->restart_work);
cancel_work_sync(&local->reconfig_filter);

ieee80211_clear_tx_pending(local);
rate_control_deinitialize(local);

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

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

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

mutex_destroy(&local->iflist_mtx);
mutex_destroy(&local->mtx);

if (local->wiphy_ciphers_allocated)
kfree(local->hw.wiphy->cipher_suites);

wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);

static int __init ieee80211_init(void)
{
struct sk_buff *skb;
int ret;

BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));

ret = rc80211_minstrel_init();
if (ret)
return ret;

ret = rc80211_minstrel_ht_init();
if (ret)
goto err_minstrel;

ret = rc80211_pid_init();
if (ret)
goto err_pid;

ret = ieee80211_iface_init();
if (ret)
goto err_netdev;

return 0;
 err_netdev:
rc80211_pid_exit();
 err_pid:
rc80211_minstrel_ht_exit();
 err_minstrel:
rc80211_minstrel_exit();

return ret;
}

static void __exit ieee80211_exit(void)
{
rc80211_pid_exit();
rc80211_minstrel_ht_exit();
rc80211_minstrel_exit();

if (mesh_allocated)
ieee80211s_stop();

ieee80211_iface_exit();

rcu_barrier();
}


subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);

MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");
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