[deliverable/linux.git] / drivers / net / wireless / mac80211_hwsim.c

/*
 * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
 *
 * 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.
 */

/*
 * TODO:
 * - IBSS mode simulation (Beacon transmission with competition for "air time")
 * - IEEE 802.11a and 802.11n modes
 * - RX filtering based on filter configuration (data->rx_filter)
 */

#include <linux/list.h>
#include <linux/spinlock.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>

MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
MODULE_LICENSE("GPL");

static int radios = 2;
module_param(radios, int, 0444);
MODULE_PARM_DESC(radios, "Number of simulated radios");

struct hwsim_vif_priv {
	u32 magic;
};

#define HWSIM_VIF_MAGIC	0x69537748

static inline void hwsim_check_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
}

static inline void hwsim_set_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	vp->magic = HWSIM_VIF_MAGIC;
}

static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	vp->magic = 0;
}

struct hwsim_sta_priv {
	u32 magic;
};

#define HWSIM_STA_MAGIC	0x6d537748

static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	WARN_ON(sp->magic != HWSIM_VIF_MAGIC);
}

static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	sp->magic = HWSIM_VIF_MAGIC;
}

static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	sp->magic = 0;
}

static struct class *hwsim_class;

static struct net_device *hwsim_mon; /* global monitor netdev */


static const struct ieee80211_channel hwsim_channels[] = {
	{ .center_freq = 2412 },
	{ .center_freq = 2417 },
	{ .center_freq = 2422 },
	{ .center_freq = 2427 },
	{ .center_freq = 2432 },
	{ .center_freq = 2437 },
	{ .center_freq = 2442 },
	{ .center_freq = 2447 },
	{ .center_freq = 2452 },
	{ .center_freq = 2457 },
	{ .center_freq = 2462 },
	{ .center_freq = 2467 },
	{ .center_freq = 2472 },
	{ .center_freq = 2484 },
};

static const struct ieee80211_rate hwsim_rates[] = {
	{ .bitrate = 10 },
	{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60 },
	{ .bitrate = 90 },
	{ .bitrate = 120 },
	{ .bitrate = 180 },
	{ .bitrate = 240 },
	{ .bitrate = 360 },
	{ .bitrate = 480 },
	{ .bitrate = 540 }
};

static spinlock_t hwsim_radio_lock;
static struct list_head hwsim_radios;

struct mac80211_hwsim_data {
	struct list_head list;
	struct ieee80211_hw *hw;
	struct device *dev;
	struct ieee80211_supported_band band;
	struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];

	struct ieee80211_channel *channel;
	int radio_enabled;
	unsigned long beacon_int; /* in jiffies unit */
	unsigned int rx_filter;
	int started;
	struct timer_list beacon_timer;
};


struct hwsim_radiotap_hdr {
	struct ieee80211_radiotap_header hdr;
	u8 rt_flags;
	u8 rt_rate;
	__le16 rt_channel;
	__le16 rt_chbitmask;
} __attribute__ ((packed));


static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
{
	/* TODO: allow packet injection */
	dev_kfree_skb(skb);
	return 0;
}


static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
				      struct sk_buff *tx_skb)
{
	struct mac80211_hwsim_data *data = hw->priv;
	struct sk_buff *skb;
	struct hwsim_radiotap_hdr *hdr;
	u16 flags;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);

	if (!netif_running(hwsim_mon))
		return;

	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
	if (skb == NULL)
		return;

	hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
	hdr->hdr.it_pad = 0;
	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
					  (1 << IEEE80211_RADIOTAP_RATE) |
					  (1 << IEEE80211_RADIOTAP_CHANNEL));
	hdr->rt_flags = 0;
	hdr->rt_rate = txrate->bitrate / 5;
	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
	flags = IEEE80211_CHAN_2GHZ;
	if (txrate->flags & IEEE80211_RATE_ERP_G)
		flags |= IEEE80211_CHAN_OFDM;
	else
		flags |= IEEE80211_CHAN_CCK;
	hdr->rt_chbitmask = cpu_to_le16(flags);

	skb->dev = hwsim_mon;
	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);
	memset(skb->cb, 0, sizeof(skb->cb));
	netif_rx(skb);
}


static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
				    struct sk_buff *skb)
{
	struct mac80211_hwsim_data *data = hw->priv, *data2;
	bool ack = false;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_rx_status rx_status;

	memset(&rx_status, 0, sizeof(rx_status));
	/* TODO: set mactime */
	rx_status.freq = data->channel->center_freq;
	rx_status.band = data->channel->band;
	rx_status.rate_idx = info->tx_rate_idx;
	/* TODO: simulate signal strength (and optional packet drop) */

	/* Copy skb to all enabled radios that are on the current frequency */
	spin_lock(&hwsim_radio_lock);
	list_for_each_entry(data2, &hwsim_radios, list) {
		struct sk_buff *nskb;

		if (data == data2)
			continue;

		if (!data2->started || !data2->radio_enabled ||
		    data->channel->center_freq != data2->channel->center_freq)
			continue;

		nskb = skb_copy(skb, GFP_ATOMIC);
		if (nskb == NULL)
			continue;

		if (memcmp(hdr->addr1, data2->hw->wiphy->perm_addr,
			   ETH_ALEN) == 0)
			ack = true;
		ieee80211_rx_irqsafe(data2->hw, nskb, &rx_status);
	}
	spin_unlock(&hwsim_radio_lock);

	return ack;
}


static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	struct mac80211_hwsim_data *data = hw->priv;
	bool ack;
	struct ieee80211_tx_info *txi;

	mac80211_hwsim_monitor_rx(hw, skb);

	if (skb->len < 10) {
		/* Should not happen; just a sanity check for addr1 use */
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	if (!data->radio_enabled) {
		printk(KERN_DEBUG "%s: dropped TX frame since radio "
		       "disabled\n", wiphy_name(hw->wiphy));
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	ack = mac80211_hwsim_tx_frame(hw, skb);

	txi = IEEE80211_SKB_CB(skb);

	if (txi->control.vif)
		hwsim_check_magic(txi->control.vif);
	if (txi->control.sta)
		hwsim_check_sta_magic(txi->control.sta);

	memset(&txi->status, 0, sizeof(txi->status));
	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
		if (ack)
			txi->flags |= IEEE80211_TX_STAT_ACK;
		else
			txi->status.excessive_retries = 1;
	}
	ieee80211_tx_status_irqsafe(hw, skb);
	return NETDEV_TX_OK;
}


static int mac80211_hwsim_start(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *data = hw->priv;
	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	data->started = 1;
	return 0;
}


static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *data = hw->priv;
	data->started = 0;
	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
}


static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
					struct ieee80211_if_init_conf *conf)
{
	DECLARE_MAC_BUF(mac);
	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	       wiphy_name(hw->wiphy), __func__, conf->type,
	       print_mac(mac, conf->mac_addr));
	hwsim_set_magic(conf->vif);
	return 0;
}


static void mac80211_hwsim_remove_interface(
	struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
{
	DECLARE_MAC_BUF(mac);
	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	       wiphy_name(hw->wiphy), __func__, conf->type,
	       print_mac(mac, conf->mac_addr));
	hwsim_check_magic(conf->vif);
	hwsim_clear_magic(conf->vif);
}


static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_hw *hw = arg;
	struct sk_buff *skb;
	struct ieee80211_tx_info *info;

	hwsim_check_magic(vif);

	if (vif->type != NL80211_IFTYPE_AP)
		return;

	skb = ieee80211_beacon_get(hw, vif);
	if (skb == NULL)
		return;
	info = IEEE80211_SKB_CB(skb);

	mac80211_hwsim_monitor_rx(hw, skb);
	mac80211_hwsim_tx_frame(hw, skb);
	dev_kfree_skb(skb);
}


static void mac80211_hwsim_beacon(unsigned long arg)
{
	struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
	struct mac80211_hwsim_data *data = hw->priv;

	if (!data->started || !data->radio_enabled)
		return;

	ieee80211_iterate_active_interfaces_atomic(
		hw, mac80211_hwsim_beacon_tx, hw);

	data->beacon_timer.expires = jiffies + data->beacon_int;
	add_timer(&data->beacon_timer);
}


static int mac80211_hwsim_config(struct ieee80211_hw *hw,
				 struct ieee80211_conf *conf)
{
	struct mac80211_hwsim_data *data = hw->priv;

	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
	       wiphy_name(hw->wiphy), __func__,
	       conf->channel->center_freq, conf->radio_enabled,
	       conf->beacon_int);

	data->channel = conf->channel;
	data->radio_enabled = conf->radio_enabled;
	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
	if (data->beacon_int < 1)
		data->beacon_int = 1;

	if (!data->started || !data->radio_enabled)
		del_timer(&data->beacon_timer);
	else
		mod_timer(&data->beacon_timer, jiffies + data->beacon_int);

	return 0;
}


static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
					    unsigned int changed_flags,
					    unsigned int *total_flags,
					    int mc_count,
					    struct dev_addr_list *mc_list)
{
	struct mac80211_hwsim_data *data = hw->priv;

	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);

	data->rx_filter = 0;
	if (*total_flags & FIF_PROMISC_IN_BSS)
		data->rx_filter |= FIF_PROMISC_IN_BSS;
	if (*total_flags & FIF_ALLMULTI)
		data->rx_filter |= FIF_ALLMULTI;

	*total_flags = data->rx_filter;
}

static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
					   struct ieee80211_vif *vif,
					   struct ieee80211_if_conf *conf)
{
	hwsim_check_magic(vif);
	return 0;
}

static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
					    struct ieee80211_vif *vif,
					    struct ieee80211_bss_conf *info,
					    u32 changed)
{
	hwsim_check_magic(vif);
}

static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
				      struct ieee80211_vif *vif,
				      enum sta_notify_cmd cmd,
				      struct ieee80211_sta *sta)
{
	hwsim_check_magic(vif);
	switch (cmd) {
	case STA_NOTIFY_ADD:
		hwsim_set_sta_magic(sta);
		break;
	case STA_NOTIFY_REMOVE:
		hwsim_clear_sta_magic(sta);
		break;
	}
}

static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
				  struct ieee80211_sta *sta,
				  bool set)
{
	hwsim_check_sta_magic(sta);
	return 0;
}

static const struct ieee80211_ops mac80211_hwsim_ops =
{
	.tx = mac80211_hwsim_tx,
	.start = mac80211_hwsim_start,
	.stop = mac80211_hwsim_stop,
	.add_interface = mac80211_hwsim_add_interface,
	.remove_interface = mac80211_hwsim_remove_interface,
	.config = mac80211_hwsim_config,
	.configure_filter = mac80211_hwsim_configure_filter,
	.config_interface = mac80211_hwsim_config_interface,
	.bss_info_changed = mac80211_hwsim_bss_info_changed,
	.sta_notify = mac80211_hwsim_sta_notify,
	.set_tim = mac80211_hwsim_set_tim,
};


static void mac80211_hwsim_free(void)
{
	struct list_head tmplist, *i, *tmp;
	struct mac80211_hwsim_data *data;

	INIT_LIST_HEAD(&tmplist);

	spin_lock_bh(&hwsim_radio_lock);
	list_for_each_safe(i, tmp, &hwsim_radios)
		list_move(i, &tmplist);
	spin_unlock_bh(&hwsim_radio_lock);

	list_for_each_entry(data, &tmplist, list) {
		ieee80211_unregister_hw(data->hw);
		device_unregister(data->dev);
		ieee80211_free_hw(data->hw);
	}
	class_destroy(hwsim_class);
}


static struct device_driver mac80211_hwsim_driver = {
	.name = "mac80211_hwsim"
};


static void hwsim_mon_setup(struct net_device *dev)
{
	dev->hard_start_xmit = hwsim_mon_xmit;
	dev->destructor = free_netdev;
	ether_setup(dev);
	dev->tx_queue_len = 0;
	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	memset(dev->dev_addr, 0, ETH_ALEN);
	dev->dev_addr[0] = 0x12;
}


static int __init init_mac80211_hwsim(void)
{
	int i, err = 0;
	u8 addr[ETH_ALEN];
	struct mac80211_hwsim_data *data;
	struct ieee80211_hw *hw;
	DECLARE_MAC_BUF(mac);

	if (radios < 1 || radios > 100)
		return -EINVAL;

	spin_lock_init(&hwsim_radio_lock);
	INIT_LIST_HEAD(&hwsim_radios);

	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
	if (IS_ERR(hwsim_class))
		return PTR_ERR(hwsim_class);

	memset(addr, 0, ETH_ALEN);
	addr[0] = 0x02;

	for (i = 0; i < radios; i++) {
		printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
		       i);
		hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
		if (!hw) {
			printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
			       "failed\n");
			err = -ENOMEM;
			goto failed;
		}
		data = hw->priv;
		data->hw = hw;

		data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
						"hwsim%d", i);
		if (IS_ERR(data->dev)) {
			printk(KERN_DEBUG
			       "mac80211_hwsim: device_create_drvdata "
			       "failed (%ld)\n", PTR_ERR(data->dev));
			err = -ENOMEM;
			goto failed_drvdata;
		}
		data->dev->driver = &mac80211_hwsim_driver;

		SET_IEEE80211_DEV(hw, data->dev);
		addr[3] = i >> 8;
		addr[4] = i;
		SET_IEEE80211_PERM_ADDR(hw, addr);

		hw->channel_change_time = 1;
		hw->queues = 4;
		hw->wiphy->interface_modes =
			BIT(NL80211_IFTYPE_STATION) |
			BIT(NL80211_IFTYPE_AP);
		hw->ampdu_queues = 1;

		/* ask mac80211 to reserve space for magic */
		hw->vif_data_size = sizeof(struct hwsim_vif_priv);
		hw->sta_data_size = sizeof(struct hwsim_sta_priv);

		memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
		memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
		data->band.channels = data->channels;
		data->band.n_channels = ARRAY_SIZE(hwsim_channels);
		data->band.bitrates = data->rates;
		data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
		data->band.ht_info.ht_supported = 1;
		data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH |
			IEEE80211_HT_CAP_GRN_FLD |
			IEEE80211_HT_CAP_SGI_40 |
			IEEE80211_HT_CAP_DSSSCCK40;
		data->band.ht_info.ampdu_factor = 0x3;
		data->band.ht_info.ampdu_density = 0x6;
		memset(data->band.ht_info.supp_mcs_set, 0,
		       sizeof(data->band.ht_info.supp_mcs_set));
		data->band.ht_info.supp_mcs_set[0] = 0xff;
		data->band.ht_info.supp_mcs_set[1] = 0xff;
		data->band.ht_info.supp_mcs_set[12] =
			IEEE80211_HT_CAP_MCS_TX_DEFINED;
		hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;

		err = ieee80211_register_hw(hw);
		if (err < 0) {
			printk(KERN_DEBUG "mac80211_hwsim: "
			       "ieee80211_register_hw failed (%d)\n", err);
			goto failed_hw;
		}

		printk(KERN_DEBUG "%s: hwaddr %s registered\n",
		       wiphy_name(hw->wiphy),
		       print_mac(mac, hw->wiphy->perm_addr));

		setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
			    (unsigned long) hw);

		list_add_tail(&data->list, &hwsim_radios);
	}

	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
	if (hwsim_mon == NULL)
		goto failed;

	rtnl_lock();

	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
	if (err < 0)
		goto failed_mon;


	err = register_netdevice(hwsim_mon);
	if (err < 0)
		goto failed_mon;

	rtnl_unlock();

	return 0;

failed_mon:
	rtnl_unlock();
	free_netdev(hwsim_mon);
	mac80211_hwsim_free();
	return err;

failed_hw:
	device_unregister(data->dev);
failed_drvdata:
	ieee80211_free_hw(hw);
failed:
	mac80211_hwsim_free();
	return err;
}


static void __exit exit_mac80211_hwsim(void)
{
	printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");

	unregister_netdev(hwsim_mon);
	mac80211_hwsim_free();
}


module_init(init_mac80211_hwsim);
module_exit(exit_mac80211_hwsim);
Commit	Line	Data
acc1e7a3 JM	1	/*
	2	* mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
	3	* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	/*
	11	* TODO:
	12	* - IBSS mode simulation (Beacon transmission with competition for "air time")
	13	* - IEEE 802.11a and 802.11n modes
	14	* - RX filtering based on filter configuration (data->rx_filter)
	15	*/
	16
0e057d73 JB	17	#include <linux/list.h>
0e057d73 JB	18	#include <linux/spinlock.h>
acc1e7a3 JM	19	#include <net/mac80211.h>
	20	#include <net/ieee80211_radiotap.h>
	21	#include <linux/if_arp.h>
	22	#include <linux/rtnetlink.h>
	23	#include <linux/etherdevice.h>
	24
	25	MODULE_AUTHOR("Jouni Malinen");
	26	MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
	27	MODULE_LICENSE("GPL");
	28
	29	static int radios = 2;
	30	module_param(radios, int, 0444);
	31	MODULE_PARM_DESC(radios, "Number of simulated radios");
	32
8aa21e6f JB	33	struct hwsim_vif_priv {
	34	u32 magic;
	35	};
	36
	37	#define HWSIM_VIF_MAGIC 0x69537748
	38
	39	static inline void hwsim_check_magic(struct ieee80211_vif *vif)
	40	{
	41	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	42	WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
	43	}
	44
	45	static inline void hwsim_set_magic(struct ieee80211_vif *vif)
	46	{
	47	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	48	vp->magic = HWSIM_VIF_MAGIC;
	49	}
	50
	51	static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
	52	{
	53	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	54	vp->magic = 0;
	55	}
acc1e7a3	56
81c06523 JB	57	struct hwsim_sta_priv {
	58	u32 magic;
	59	};
	60
	61	#define HWSIM_STA_MAGIC 0x6d537748
	62
	63	static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
	64	{
	65	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	66	WARN_ON(sp->magic != HWSIM_VIF_MAGIC);
	67	}
	68
	69	static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
	70	{
	71	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	72	sp->magic = HWSIM_VIF_MAGIC;
	73	}
	74
	75	static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
	76	{
	77	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	78	sp->magic = 0;
	79	}
	80
acc1e7a3 JM	81	static struct class *hwsim_class;
acc1e7a3 JM	82
acc1e7a3 JM	83	static struct net_device hwsim_mon; / global monitor netdev */
	84
	85
	86	static const struct ieee80211_channel hwsim_channels[] = {
	87	{ .center_freq = 2412 },
	88	{ .center_freq = 2417 },
	89	{ .center_freq = 2422 },
	90	{ .center_freq = 2427 },
	91	{ .center_freq = 2432 },
	92	{ .center_freq = 2437 },
	93	{ .center_freq = 2442 },
	94	{ .center_freq = 2447 },
	95	{ .center_freq = 2452 },
	96	{ .center_freq = 2457 },
	97	{ .center_freq = 2462 },
	98	{ .center_freq = 2467 },
	99	{ .center_freq = 2472 },
	100	{ .center_freq = 2484 },
	101	};
	102
	103	static const struct ieee80211_rate hwsim_rates[] = {
	104	{ .bitrate = 10 },
	105	{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	106	{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	107	{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	108	{ .bitrate = 60 },
	109	{ .bitrate = 90 },
	110	{ .bitrate = 120 },
	111	{ .bitrate = 180 },
	112	{ .bitrate = 240 },
	113	{ .bitrate = 360 },
	114	{ .bitrate = 480 },
	115	{ .bitrate = 540 }
	116	};
	117
0e057d73 JB	118	static spinlock_t hwsim_radio_lock;
	119	static struct list_head hwsim_radios;
	120
acc1e7a3	121	struct mac80211_hwsim_data {
0e057d73 JB	122	struct list_head list;
0e057d73 JB	123	struct ieee80211_hw *hw;
acc1e7a3 JM	124	struct device *dev;
	125	struct ieee80211_supported_band band;
	126	struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
	127	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
	128
	129	struct ieee80211_channel *channel;
	130	int radio_enabled;
	131	unsigned long beacon_int; /* in jiffies unit */
	132	unsigned int rx_filter;
	133	int started;
	134	struct timer_list beacon_timer;
	135	};
	136
	137
	138	struct hwsim_radiotap_hdr {
	139	struct ieee80211_radiotap_header hdr;
	140	u8 rt_flags;
	141	u8 rt_rate;
	142	__le16 rt_channel;
	143	__le16 rt_chbitmask;
	144	} __attribute__ ((packed));
	145
	146
	147	static int hwsim_mon_xmit(struct sk_buff skb, struct net_device dev)
	148	{
	149	/* TODO: allow packet injection */
	150	dev_kfree_skb(skb);
	151	return 0;
	152	}
	153
	154
	155	static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
	156	struct sk_buff *tx_skb)
	157	{
	158	struct mac80211_hwsim_data *data = hw->priv;
	159	struct sk_buff *skb;
	160	struct hwsim_radiotap_hdr *hdr;
	161	u16 flags;
	162	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
	163	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
	164
	165	if (!netif_running(hwsim_mon))
	166	return;
	167
	168	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
	169	if (skb == NULL)
	170	return;
	171
	172	hdr = (struct hwsim_radiotap_hdr ) skb_push(skb, sizeof(hdr));
	173	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
	174	hdr->hdr.it_pad = 0;
	175	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
f248f105 JM	176	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) \|
	177	(1 << IEEE80211_RADIOTAP_RATE) \|
	178	(1 << IEEE80211_RADIOTAP_CHANNEL));
acc1e7a3 JM	179	hdr->rt_flags = 0;
acc1e7a3 JM	180	hdr->rt_rate = txrate->bitrate / 5;
df70b4ac	181	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
acc1e7a3 JM	182	flags = IEEE80211_CHAN_2GHZ;
	183	if (txrate->flags & IEEE80211_RATE_ERP_G)
	184	flags \|= IEEE80211_CHAN_OFDM;
	185	else
	186	flags \|= IEEE80211_CHAN_CCK;
	187	hdr->rt_chbitmask = cpu_to_le16(flags);
	188
	189	skb->dev = hwsim_mon;
	190	skb_set_mac_header(skb, 0);
	191	skb->ip_summed = CHECKSUM_UNNECESSARY;
	192	skb->pkt_type = PACKET_OTHERHOST;
f248f105	193	skb->protocol = htons(ETH_P_802_2);
acc1e7a3 JM	194	memset(skb->cb, 0, sizeof(skb->cb));
	195	netif_rx(skb);
	196	}
	197
	198
0e057d73 JB	199	static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
0e057d73 JB	200	struct sk_buff *skb)
acc1e7a3	201	{
0e057d73 JB	202	struct mac80211_hwsim_data data = hw->priv, data2;
0e057d73 JB	203	bool ack = false;
e36cfdc9	204	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
acc1e7a3	205	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e36cfdc9	206	struct ieee80211_rx_status rx_status;
acc1e7a3 JM	207
	208	memset(&rx_status, 0, sizeof(rx_status));
	209	/* TODO: set mactime */
	210	rx_status.freq = data->channel->center_freq;
	211	rx_status.band = data->channel->band;
	212	rx_status.rate_idx = info->tx_rate_idx;
	213	/* TODO: simulate signal strength (and optional packet drop) */
	214
	215	/* Copy skb to all enabled radios that are on the current frequency */
0e057d73 JB	216	spin_lock(&hwsim_radio_lock);
0e057d73 JB	217	list_for_each_entry(data2, &hwsim_radios, list) {
acc1e7a3 JM	218	struct sk_buff *nskb;
acc1e7a3 JM	219
0e057d73	220	if (data == data2)
acc1e7a3	221	continue;
0e057d73	222
acc1e7a3 JM	223	if (!data2->started \|\| !data2->radio_enabled \|\|
	224	data->channel->center_freq != data2->channel->center_freq)
	225	continue;
	226
	227	nskb = skb_copy(skb, GFP_ATOMIC);
	228	if (nskb == NULL)
	229	continue;
	230
0e057d73	231	if (memcmp(hdr->addr1, data2->hw->wiphy->perm_addr,
acc1e7a3	232	ETH_ALEN) == 0)
0e057d73 JB	233	ack = true;
0e057d73 JB	234	ieee80211_rx_irqsafe(data2->hw, nskb, &rx_status);
acc1e7a3	235	}
0e057d73	236	spin_unlock(&hwsim_radio_lock);
acc1e7a3	237
e36cfdc9 JM	238	return ack;
	239	}
	240
	241
	242	static int mac80211_hwsim_tx(struct ieee80211_hw hw, struct sk_buff skb)
	243	{
	244	struct mac80211_hwsim_data *data = hw->priv;
0e057d73	245	bool ack;
e36cfdc9 JM	246	struct ieee80211_tx_info *txi;
	247
	248	mac80211_hwsim_monitor_rx(hw, skb);
	249
	250	if (skb->len < 10) {
	251	/* Should not happen; just a sanity check for addr1 use */
	252	dev_kfree_skb(skb);
	253	return NETDEV_TX_OK;
	254	}
	255
	256	if (!data->radio_enabled) {
	257	printk(KERN_DEBUG "%s: dropped TX frame since radio "
	258	"disabled\n", wiphy_name(hw->wiphy));
	259	dev_kfree_skb(skb);
	260	return NETDEV_TX_OK;
	261	}
	262
	263	ack = mac80211_hwsim_tx_frame(hw, skb);
	264
acc1e7a3	265	txi = IEEE80211_SKB_CB(skb);
8aa21e6f	266
25d834e1 JB	267	if (txi->control.vif)
25d834e1 JB	268	hwsim_check_magic(txi->control.vif);
81c06523 JB	269	if (txi->control.sta)
81c06523 JB	270	hwsim_check_sta_magic(txi->control.sta);
8aa21e6f	271
acc1e7a3 JM	272	memset(&txi->status, 0, sizeof(txi->status));
	273	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
	274	if (ack)
	275	txi->flags \|= IEEE80211_TX_STAT_ACK;
	276	else
	277	txi->status.excessive_retries = 1;
	278	}
	279	ieee80211_tx_status_irqsafe(hw, skb);
	280	return NETDEV_TX_OK;
	281	}
	282
	283
	284	static int mac80211_hwsim_start(struct ieee80211_hw *hw)
	285	{
	286	struct mac80211_hwsim_data *data = hw->priv;
	287	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	288	data->started = 1;
	289	return 0;
	290	}
	291
	292
	293	static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
	294	{
	295	struct mac80211_hwsim_data *data = hw->priv;
	296	data->started = 0;
	297	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	298	}
	299
	300
	301	static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
	302	struct ieee80211_if_init_conf *conf)
	303	{
	304	DECLARE_MAC_BUF(mac);
	305	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	306	wiphy_name(hw->wiphy), __func__, conf->type,
	307	print_mac(mac, conf->mac_addr));
8aa21e6f	308	hwsim_set_magic(conf->vif);
acc1e7a3 JM	309	return 0;
	310	}
	311
	312
	313	static void mac80211_hwsim_remove_interface(
	314	struct ieee80211_hw hw, struct ieee80211_if_init_conf conf)
	315	{
	316	DECLARE_MAC_BUF(mac);
	317	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	318	wiphy_name(hw->wiphy), __func__, conf->type,
	319	print_mac(mac, conf->mac_addr));
8aa21e6f JB	320	hwsim_check_magic(conf->vif);
8aa21e6f JB	321	hwsim_clear_magic(conf->vif);
acc1e7a3 JM	322	}
	323
	324
	325	static void mac80211_hwsim_beacon_tx(void arg, u8 mac,
	326	struct ieee80211_vif *vif)
	327	{
	328	struct ieee80211_hw *hw = arg;
acc1e7a3	329	struct sk_buff *skb;
acc1e7a3 JM	330	struct ieee80211_tx_info *info;
acc1e7a3 JM	331
8aa21e6f JB	332	hwsim_check_magic(vif);
8aa21e6f JB	333
05c914fe	334	if (vif->type != NL80211_IFTYPE_AP)
acc1e7a3 JM	335	return;
	336
	337	skb = ieee80211_beacon_get(hw, vif);
	338	if (skb == NULL)
	339	return;
	340	info = IEEE80211_SKB_CB(skb);
	341
	342	mac80211_hwsim_monitor_rx(hw, skb);
e36cfdc9	343	mac80211_hwsim_tx_frame(hw, skb);
acc1e7a3 JM	344	dev_kfree_skb(skb);
	345	}
	346
	347
	348	static void mac80211_hwsim_beacon(unsigned long arg)
	349	{
	350	struct ieee80211_hw hw = (struct ieee80211_hw ) arg;
	351	struct mac80211_hwsim_data *data = hw->priv;
	352
	353	if (!data->started \|\| !data->radio_enabled)
	354	return;
	355
f248f105 JM	356	ieee80211_iterate_active_interfaces_atomic(
f248f105 JM	357	hw, mac80211_hwsim_beacon_tx, hw);
acc1e7a3 JM	358
	359	data->beacon_timer.expires = jiffies + data->beacon_int;
	360	add_timer(&data->beacon_timer);
	361	}
	362
	363
	364	static int mac80211_hwsim_config(struct ieee80211_hw *hw,
	365	struct ieee80211_conf *conf)
	366	{
	367	struct mac80211_hwsim_data *data = hw->priv;
	368
	369	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
	370	wiphy_name(hw->wiphy), __func__,
	371	conf->channel->center_freq, conf->radio_enabled,
	372	conf->beacon_int);
	373
	374	data->channel = conf->channel;
	375	data->radio_enabled = conf->radio_enabled;
	376	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
	377	if (data->beacon_int < 1)
	378	data->beacon_int = 1;
	379
	380	if (!data->started \|\| !data->radio_enabled)
	381	del_timer(&data->beacon_timer);
	382	else
	383	mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
	384
	385	return 0;
	386	}
	387
	388
	389	static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
	390	unsigned int changed_flags,
	391	unsigned int *total_flags,
	392	int mc_count,
	393	struct dev_addr_list *mc_list)
	394	{
	395	struct mac80211_hwsim_data *data = hw->priv;
	396
	397	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	398
	399	data->rx_filter = 0;
	400	if (*total_flags & FIF_PROMISC_IN_BSS)
	401	data->rx_filter \|= FIF_PROMISC_IN_BSS;
	402	if (*total_flags & FIF_ALLMULTI)
	403	data->rx_filter \|= FIF_ALLMULTI;
	404
	405	*total_flags = data->rx_filter;
	406	}
	407
8aa21e6f JB	408	static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
	409	struct ieee80211_vif *vif,
	410	struct ieee80211_if_conf *conf)
	411	{
	412	hwsim_check_magic(vif);
	413	return 0;
	414	}
acc1e7a3	415
8aa21e6f JB	416	static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
	417	struct ieee80211_vif *vif,
	418	struct ieee80211_bss_conf *info,
	419	u32 changed)
	420	{
	421	hwsim_check_magic(vif);
	422	}
	423
	424	static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
	425	struct ieee80211_vif *vif,
17741cdc JB	426	enum sta_notify_cmd cmd,
17741cdc JB	427	struct ieee80211_sta *sta)
8aa21e6f JB	428	{
8aa21e6f JB	429	hwsim_check_magic(vif);
81c06523 JB	430	switch (cmd) {
	431	case STA_NOTIFY_ADD:
	432	hwsim_set_sta_magic(sta);
	433	break;
	434	case STA_NOTIFY_REMOVE:
	435	hwsim_clear_sta_magic(sta);
	436	break;
	437	}
	438	}
	439
	440	static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
	441	struct ieee80211_sta *sta,
	442	bool set)
	443	{
	444	hwsim_check_sta_magic(sta);
	445	return 0;
8aa21e6f	446	}
acc1e7a3 JM	447
	448	static const struct ieee80211_ops mac80211_hwsim_ops =
	449	{
	450	.tx = mac80211_hwsim_tx,
	451	.start = mac80211_hwsim_start,
	452	.stop = mac80211_hwsim_stop,
	453	.add_interface = mac80211_hwsim_add_interface,
	454	.remove_interface = mac80211_hwsim_remove_interface,
	455	.config = mac80211_hwsim_config,
	456	.configure_filter = mac80211_hwsim_configure_filter,
8aa21e6f JB	457	.config_interface = mac80211_hwsim_config_interface,
	458	.bss_info_changed = mac80211_hwsim_bss_info_changed,
	459	.sta_notify = mac80211_hwsim_sta_notify,
81c06523	460	.set_tim = mac80211_hwsim_set_tim,
acc1e7a3 JM	461	};
	462
	463
	464	static void mac80211_hwsim_free(void)
	465	{
0e057d73 JB	466	struct list_head tmplist, i, tmp;
	467	struct mac80211_hwsim_data *data;
	468
	469	INIT_LIST_HEAD(&tmplist);
	470
	471	spin_lock_bh(&hwsim_radio_lock);
	472	list_for_each_safe(i, tmp, &hwsim_radios)
	473	list_move(i, &tmplist);
	474	spin_unlock_bh(&hwsim_radio_lock);
	475
	476	list_for_each_entry(data, &tmplist, list) {
	477	ieee80211_unregister_hw(data->hw);
	478	device_unregister(data->dev);
	479	ieee80211_free_hw(data->hw);
acc1e7a3	480	}
acc1e7a3 JM	481	class_destroy(hwsim_class);
	482	}
	483
	484
	485	static struct device_driver mac80211_hwsim_driver = {
	486	.name = "mac80211_hwsim"
	487	};
	488
	489
	490	static void hwsim_mon_setup(struct net_device *dev)
	491	{
	492	dev->hard_start_xmit = hwsim_mon_xmit;
	493	dev->destructor = free_netdev;
	494	ether_setup(dev);
	495	dev->tx_queue_len = 0;
	496	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	497	memset(dev->dev_addr, 0, ETH_ALEN);
	498	dev->dev_addr[0] = 0x12;
	499	}
	500
	501
	502	static int __init init_mac80211_hwsim(void)
	503	{
	504	int i, err = 0;
	505	u8 addr[ETH_ALEN];
	506	struct mac80211_hwsim_data *data;
	507	struct ieee80211_hw *hw;
	508	DECLARE_MAC_BUF(mac);
	509
0e057d73	510	if (radios < 1 \|\| radios > 100)
acc1e7a3 JM	511	return -EINVAL;
acc1e7a3 JM	512
0e057d73 JB	513	spin_lock_init(&hwsim_radio_lock);
0e057d73 JB	514	INIT_LIST_HEAD(&hwsim_radios);
acc1e7a3 JM	515
acc1e7a3 JM	516	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
0e057d73	517	if (IS_ERR(hwsim_class))
acc1e7a3	518	return PTR_ERR(hwsim_class);
acc1e7a3 JM	519
	520	memset(addr, 0, ETH_ALEN);
	521	addr[0] = 0x02;
	522
0e057d73	523	for (i = 0; i < radios; i++) {
acc1e7a3 JM	524	printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
	525	i);
	526	hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
0e057d73	527	if (!hw) {
acc1e7a3 JM	528	printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
	529	"failed\n");
	530	err = -ENOMEM;
	531	goto failed;
	532	}
acc1e7a3	533	data = hw->priv;
0e057d73 JB	534	data->hw = hw;
0e057d73 JB	535
e800f17c SR	536	data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
e800f17c SR	537	"hwsim%d", i);
acc1e7a3	538	if (IS_ERR(data->dev)) {
e800f17c SR	539	printk(KERN_DEBUG
e800f17c SR	540	"mac80211_hwsim: device_create_drvdata "
acc1e7a3 JM	541	"failed (%ld)\n", PTR_ERR(data->dev));
acc1e7a3 JM	542	err = -ENOMEM;
3a33cc10	543	goto failed_drvdata;
acc1e7a3 JM	544	}
acc1e7a3 JM	545	data->dev->driver = &mac80211_hwsim_driver;
acc1e7a3 JM	546
	547	SET_IEEE80211_DEV(hw, data->dev);
	548	addr[3] = i >> 8;
	549	addr[4] = i;
	550	SET_IEEE80211_PERM_ADDR(hw, addr);
	551
	552	hw->channel_change_time = 1;
87e8b64e	553	hw->queues = 4;
f59ac048 LR	554	hw->wiphy->interface_modes =
	555	BIT(NL80211_IFTYPE_STATION) \|
	556	BIT(NL80211_IFTYPE_AP);
87e8b64e	557	hw->ampdu_queues = 1;
acc1e7a3	558
8aa21e6f JB	559	/* ask mac80211 to reserve space for magic */
8aa21e6f JB	560	hw->vif_data_size = sizeof(struct hwsim_vif_priv);
81c06523	561	hw->sta_data_size = sizeof(struct hwsim_sta_priv);
8aa21e6f	562
acc1e7a3 JM	563	memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
	564	memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
	565	data->band.channels = data->channels;
	566	data->band.n_channels = ARRAY_SIZE(hwsim_channels);
	567	data->band.bitrates = data->rates;
	568	data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
87e8b64e JM	569	data->band.ht_info.ht_supported = 1;
	570	data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH \|
	571	IEEE80211_HT_CAP_GRN_FLD \|
	572	IEEE80211_HT_CAP_SGI_40 \|
	573	IEEE80211_HT_CAP_DSSSCCK40;
	574	data->band.ht_info.ampdu_factor = 0x3;
	575	data->band.ht_info.ampdu_density = 0x6;
	576	memset(data->band.ht_info.supp_mcs_set, 0,
	577	sizeof(data->band.ht_info.supp_mcs_set));
	578	data->band.ht_info.supp_mcs_set[0] = 0xff;
	579	data->band.ht_info.supp_mcs_set[1] = 0xff;
	580	data->band.ht_info.supp_mcs_set[12] =
	581	IEEE80211_HT_CAP_MCS_TX_DEFINED;
acc1e7a3 JM	582	hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
	583
	584	err = ieee80211_register_hw(hw);
	585	if (err < 0) {
	586	printk(KERN_DEBUG "mac80211_hwsim: "
	587	"ieee80211_register_hw failed (%d)\n", err);
3a33cc10	588	goto failed_hw;
acc1e7a3 JM	589	}
	590
	591	printk(KERN_DEBUG "%s: hwaddr %s registered\n",
	592	wiphy_name(hw->wiphy),
	593	print_mac(mac, hw->wiphy->perm_addr));
	594
	595	setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
	596	(unsigned long) hw);
0e057d73 JB	597
0e057d73 JB	598	list_add_tail(&data->list, &hwsim_radios);
acc1e7a3 JM	599	}
	600
	601	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
	602	if (hwsim_mon == NULL)
	603	goto failed;
	604
	605	rtnl_lock();
	606
	607	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
3a33cc10	608	if (err < 0)
acc1e7a3	609	goto failed_mon;
3a33cc10	610
acc1e7a3 JM	611
	612	err = register_netdevice(hwsim_mon);
	613	if (err < 0)
	614	goto failed_mon;
	615
	616	rtnl_unlock();
	617
	618	return 0;
	619
	620	failed_mon:
	621	rtnl_unlock();
	622	free_netdev(hwsim_mon);
3a33cc10 IS	623	mac80211_hwsim_free();
3a33cc10 IS	624	return err;
acc1e7a3	625
3a33cc10 IS	626	failed_hw:
	627	device_unregister(data->dev);
	628	failed_drvdata:
	629	ieee80211_free_hw(hw);
acc1e7a3 JM	630	failed:
	631	mac80211_hwsim_free();
	632	return err;
	633	}
	634
	635
	636	static void __exit exit_mac80211_hwsim(void)
	637	{
0e057d73	638	printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");
acc1e7a3 JM	639
	640	unregister_netdev(hwsim_mon);
	641	mac80211_hwsim_free();
	642	}
	643
	644
	645	module_init(init_mac80211_hwsim);
	646	module_exit(exit_mac80211_hwsim);