[mirror_ubuntu-eoan-kernel.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 <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 ieee80211_hw **hwsim_radios;
static int hwsim_radio_count;
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 }
};

struct mac80211_hwsim_data {
	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 int mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
				   struct sk_buff *skb)
{
	struct mac80211_hwsim_data *data = hw->priv;
	int i, ack = 0;
	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 */
	for (i = 0; i < hwsim_radio_count; i++) {
		struct mac80211_hwsim_data *data2;
		struct sk_buff *nskb;

		if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
			continue;
		data2 = hwsim_radios[i]->priv;
		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, hwsim_radios[i]->wiphy->perm_addr,
			   ETH_ALEN) == 0)
			ack = 1;
		ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
	}

	return ack;
}


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

	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)
{
	int i;

	for (i = 0; i < hwsim_radio_count; i++) {
		if (hwsim_radios[i]) {
			struct mac80211_hwsim_data *data;
			data = hwsim_radios[i]->priv;
			ieee80211_unregister_hw(hwsim_radios[i]);
			device_unregister(data->dev);
			ieee80211_free_hw(hwsim_radios[i]);
		}
	}
	kfree(hwsim_radios);
	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 > 65535)
		return -EINVAL;

	hwsim_radio_count = radios;
	hwsim_radios = kcalloc(hwsim_radio_count,
			       sizeof(struct ieee80211_hw *), GFP_KERNEL);
	if (hwsim_radios == NULL)
		return -ENOMEM;

	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
	if (IS_ERR(hwsim_class)) {
		kfree(hwsim_radios);
		return PTR_ERR(hwsim_class);
	}

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

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

		data = hw->priv;
		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);
	}

	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);
	hwsim_radios[i] = NULL;
failed:
	mac80211_hwsim_free();
	return err;
}


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

	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
	17	#include <net/mac80211.h>
	18	#include <net/ieee80211_radiotap.h>
	19	#include <linux/if_arp.h>
	20	#include <linux/rtnetlink.h>
	21	#include <linux/etherdevice.h>
	22
	23	MODULE_AUTHOR("Jouni Malinen");
	24	MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
	25	MODULE_LICENSE("GPL");
	26
	27	static int radios = 2;
	28	module_param(radios, int, 0444);
	29	MODULE_PARM_DESC(radios, "Number of simulated radios");
	30
8aa21e6f JB	31	struct hwsim_vif_priv {
	32	u32 magic;
	33	};
	34
	35	#define HWSIM_VIF_MAGIC 0x69537748
	36
	37	static inline void hwsim_check_magic(struct ieee80211_vif *vif)
	38	{
	39	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	40	WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
	41	}
	42
	43	static inline void hwsim_set_magic(struct ieee80211_vif *vif)
	44	{
	45	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	46	vp->magic = HWSIM_VIF_MAGIC;
	47	}
	48
	49	static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
	50	{
	51	struct hwsim_vif_priv vp = (void )vif->drv_priv;
	52	vp->magic = 0;
	53	}
acc1e7a3	54
81c06523 JB	55	struct hwsim_sta_priv {
	56	u32 magic;
	57	};
	58
	59	#define HWSIM_STA_MAGIC 0x6d537748
	60
	61	static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
	62	{
	63	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	64	WARN_ON(sp->magic != HWSIM_VIF_MAGIC);
	65	}
	66
	67	static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
	68	{
	69	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	70	sp->magic = HWSIM_VIF_MAGIC;
	71	}
	72
	73	static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
	74	{
	75	struct hwsim_sta_priv sp = (void )sta->drv_priv;
	76	sp->magic = 0;
	77	}
	78
acc1e7a3 JM	79	static struct class *hwsim_class;
	80
	81	static struct ieee80211_hw **hwsim_radios;
	82	static int hwsim_radio_count;
	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
	118	struct mac80211_hwsim_data {
	119	struct device *dev;
	120	struct ieee80211_supported_band band;
	121	struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
	122	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
	123
	124	struct ieee80211_channel *channel;
	125	int radio_enabled;
	126	unsigned long beacon_int; /* in jiffies unit */
	127	unsigned int rx_filter;
	128	int started;
	129	struct timer_list beacon_timer;
	130	};
	131
	132
	133	struct hwsim_radiotap_hdr {
	134	struct ieee80211_radiotap_header hdr;
	135	u8 rt_flags;
	136	u8 rt_rate;
	137	__le16 rt_channel;
	138	__le16 rt_chbitmask;
	139	} __attribute__ ((packed));
	140
	141
	142	static int hwsim_mon_xmit(struct sk_buff skb, struct net_device dev)
143	{
144	/* TODO: allow packet injection */
145	dev_kfree_skb(skb);
146	return 0;
147	}
148
149
150	static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
151	struct sk_buff *tx_skb)
152	{
153	struct mac80211_hwsim_data *data = hw->priv;
154	struct sk_buff *skb;
155	struct hwsim_radiotap_hdr *hdr;
156	u16 flags;
157	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
158	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
159
160	if (!netif_running(hwsim_mon))
161	return;
162
163	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
164	if (skb == NULL)
165	return;
166
167	hdr = (struct hwsim_radiotap_hdr ) skb_push(skb, sizeof(hdr));
168	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
169	hdr->hdr.it_pad = 0;
170	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
f248f105 JM	171	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) \|
	172	(1 << IEEE80211_RADIOTAP_RATE) \|
	173	(1 << IEEE80211_RADIOTAP_CHANNEL));
acc1e7a3 JM	174	hdr->rt_flags = 0;
acc1e7a3 JM	175	hdr->rt_rate = txrate->bitrate / 5;
df70b4ac	176	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
acc1e7a3 JM	177	flags = IEEE80211_CHAN_2GHZ;
	178	if (txrate->flags & IEEE80211_RATE_ERP_G)
	179	flags \|= IEEE80211_CHAN_OFDM;
	180	else
	181	flags \|= IEEE80211_CHAN_CCK;
	182	hdr->rt_chbitmask = cpu_to_le16(flags);
	183
	184	skb->dev = hwsim_mon;
	185	skb_set_mac_header(skb, 0);
	186	skb->ip_summed = CHECKSUM_UNNECESSARY;
	187	skb->pkt_type = PACKET_OTHERHOST;
f248f105	188	skb->protocol = htons(ETH_P_802_2);
acc1e7a3 JM	189	memset(skb->cb, 0, sizeof(skb->cb));
	190	netif_rx(skb);
	191	}
	192
	193
e36cfdc9 JM	194	static int mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
e36cfdc9 JM	195	struct sk_buff *skb)
acc1e7a3 JM	196	{
acc1e7a3 JM	197	struct mac80211_hwsim_data *data = hw->priv;
acc1e7a3	198	int i, ack = 0;
e36cfdc9	199	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
acc1e7a3	200	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e36cfdc9	201	struct ieee80211_rx_status rx_status;
acc1e7a3 JM	202
	203	memset(&rx_status, 0, sizeof(rx_status));
	204	/* TODO: set mactime */
	205	rx_status.freq = data->channel->center_freq;
	206	rx_status.band = data->channel->band;
	207	rx_status.rate_idx = info->tx_rate_idx;
	208	/* TODO: simulate signal strength (and optional packet drop) */
	209
	210	/* Copy skb to all enabled radios that are on the current frequency */
	211	for (i = 0; i < hwsim_radio_count; i++) {
	212	struct mac80211_hwsim_data *data2;
	213	struct sk_buff *nskb;
	214
	215	if (hwsim_radios[i] == NULL \|\| hwsim_radios[i] == hw)
	216	continue;
	217	data2 = hwsim_radios[i]->priv;
	218	if (!data2->started \|\| !data2->radio_enabled \|\|
	219	data->channel->center_freq != data2->channel->center_freq)
	220	continue;
	221
	222	nskb = skb_copy(skb, GFP_ATOMIC);
	223	if (nskb == NULL)
	224	continue;
	225
	226	if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr,
	227	ETH_ALEN) == 0)
	228	ack = 1;
	229	ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
	230	}
	231
e36cfdc9 JM	232	return ack;
	233	}
	234
	235
	236	static int mac80211_hwsim_tx(struct ieee80211_hw hw, struct sk_buff skb)
	237	{
	238	struct mac80211_hwsim_data *data = hw->priv;
	239	int ack;
	240	struct ieee80211_tx_info *txi;
	241
	242	mac80211_hwsim_monitor_rx(hw, skb);
	243
	244	if (skb->len < 10) {
	245	/* Should not happen; just a sanity check for addr1 use */
	246	dev_kfree_skb(skb);
	247	return NETDEV_TX_OK;
	248	}
	249
	250	if (!data->radio_enabled) {
	251	printk(KERN_DEBUG "%s: dropped TX frame since radio "
	252	"disabled\n", wiphy_name(hw->wiphy));
	253	dev_kfree_skb(skb);
	254	return NETDEV_TX_OK;
	255	}
	256
	257	ack = mac80211_hwsim_tx_frame(hw, skb);
	258
acc1e7a3	259	txi = IEEE80211_SKB_CB(skb);
8aa21e6f JB	260
8aa21e6f JB	261	hwsim_check_magic(txi->control.vif);
81c06523 JB	262	if (txi->control.sta)
81c06523 JB	263	hwsim_check_sta_magic(txi->control.sta);
8aa21e6f	264
acc1e7a3 JM	265	memset(&txi->status, 0, sizeof(txi->status));
	266	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
	267	if (ack)
	268	txi->flags \|= IEEE80211_TX_STAT_ACK;
	269	else
	270	txi->status.excessive_retries = 1;
	271	}
	272	ieee80211_tx_status_irqsafe(hw, skb);
	273	return NETDEV_TX_OK;
	274	}
	275
	276
	277	static int mac80211_hwsim_start(struct ieee80211_hw *hw)
	278	{
	279	struct mac80211_hwsim_data *data = hw->priv;
	280	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	281	data->started = 1;
	282	return 0;
	283	}
	284
	285
	286	static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
	287	{
	288	struct mac80211_hwsim_data *data = hw->priv;
	289	data->started = 0;
	290	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	291	}
	292
	293
	294	static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
	295	struct ieee80211_if_init_conf *conf)
	296	{
	297	DECLARE_MAC_BUF(mac);
	298	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	299	wiphy_name(hw->wiphy), __func__, conf->type,
	300	print_mac(mac, conf->mac_addr));
8aa21e6f	301	hwsim_set_magic(conf->vif);
acc1e7a3 JM	302	return 0;
	303	}
	304
	305
	306	static void mac80211_hwsim_remove_interface(
	307	struct ieee80211_hw hw, struct ieee80211_if_init_conf conf)
	308	{
	309	DECLARE_MAC_BUF(mac);
	310	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	311	wiphy_name(hw->wiphy), __func__, conf->type,
	312	print_mac(mac, conf->mac_addr));
8aa21e6f JB	313	hwsim_check_magic(conf->vif);
8aa21e6f JB	314	hwsim_clear_magic(conf->vif);
acc1e7a3 JM	315	}
	316
	317
	318	static void mac80211_hwsim_beacon_tx(void arg, u8 mac,
	319	struct ieee80211_vif *vif)
	320	{
	321	struct ieee80211_hw *hw = arg;
acc1e7a3	322	struct sk_buff *skb;
acc1e7a3 JM	323	struct ieee80211_tx_info *info;
acc1e7a3 JM	324
8aa21e6f JB	325	hwsim_check_magic(vif);
8aa21e6f JB	326
05c914fe	327	if (vif->type != NL80211_IFTYPE_AP)
acc1e7a3 JM	328	return;
	329
	330	skb = ieee80211_beacon_get(hw, vif);
	331	if (skb == NULL)
	332	return;
	333	info = IEEE80211_SKB_CB(skb);
	334
	335	mac80211_hwsim_monitor_rx(hw, skb);
e36cfdc9	336	mac80211_hwsim_tx_frame(hw, skb);
acc1e7a3 JM	337	dev_kfree_skb(skb);
	338	}
	339
	340
	341	static void mac80211_hwsim_beacon(unsigned long arg)
	342	{
	343	struct ieee80211_hw hw = (struct ieee80211_hw ) arg;
	344	struct mac80211_hwsim_data *data = hw->priv;
	345
	346	if (!data->started \|\| !data->radio_enabled)
	347	return;
	348
f248f105 JM	349	ieee80211_iterate_active_interfaces_atomic(
f248f105 JM	350	hw, mac80211_hwsim_beacon_tx, hw);
acc1e7a3 JM	351
	352	data->beacon_timer.expires = jiffies + data->beacon_int;
	353	add_timer(&data->beacon_timer);
	354	}
	355
	356
	357	static int mac80211_hwsim_config(struct ieee80211_hw *hw,
	358	struct ieee80211_conf *conf)
	359	{
	360	struct mac80211_hwsim_data *data = hw->priv;
	361
	362	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
	363	wiphy_name(hw->wiphy), __func__,
	364	conf->channel->center_freq, conf->radio_enabled,
	365	conf->beacon_int);
	366
	367	data->channel = conf->channel;
	368	data->radio_enabled = conf->radio_enabled;
	369	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
	370	if (data->beacon_int < 1)
	371	data->beacon_int = 1;
	372
	373	if (!data->started \|\| !data->radio_enabled)
	374	del_timer(&data->beacon_timer);
	375	else
	376	mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
	377
	378	return 0;
	379	}
	380
	381
	382	static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
	383	unsigned int changed_flags,
	384	unsigned int *total_flags,
	385	int mc_count,
	386	struct dev_addr_list *mc_list)
	387	{
	388	struct mac80211_hwsim_data *data = hw->priv;
	389
	390	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	391
	392	data->rx_filter = 0;
	393	if (*total_flags & FIF_PROMISC_IN_BSS)
	394	data->rx_filter \|= FIF_PROMISC_IN_BSS;
	395	if (*total_flags & FIF_ALLMULTI)
	396	data->rx_filter \|= FIF_ALLMULTI;
	397
	398	*total_flags = data->rx_filter;
	399	}
	400
8aa21e6f JB	401	static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
	402	struct ieee80211_vif *vif,
	403	struct ieee80211_if_conf *conf)
	404	{
	405	hwsim_check_magic(vif);
	406	return 0;
	407	}
acc1e7a3	408
8aa21e6f JB	409	static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
	410	struct ieee80211_vif *vif,
	411	struct ieee80211_bss_conf *info,
	412	u32 changed)
	413	{
	414	hwsim_check_magic(vif);
	415	}
	416
	417	static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
	418	struct ieee80211_vif *vif,
17741cdc JB	419	enum sta_notify_cmd cmd,
17741cdc JB	420	struct ieee80211_sta *sta)
8aa21e6f JB	421	{
8aa21e6f JB	422	hwsim_check_magic(vif);
81c06523 JB	423	switch (cmd) {
	424	case STA_NOTIFY_ADD:
	425	hwsim_set_sta_magic(sta);
	426	break;
	427	case STA_NOTIFY_REMOVE:
	428	hwsim_clear_sta_magic(sta);
	429	break;
	430	}
	431	}
	432
	433	static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
	434	struct ieee80211_sta *sta,
	435	bool set)
	436	{
	437	hwsim_check_sta_magic(sta);
	438	return 0;
8aa21e6f	439	}
acc1e7a3 JM	440
	441	static const struct ieee80211_ops mac80211_hwsim_ops =
	442	{
	443	.tx = mac80211_hwsim_tx,
	444	.start = mac80211_hwsim_start,
	445	.stop = mac80211_hwsim_stop,
	446	.add_interface = mac80211_hwsim_add_interface,
	447	.remove_interface = mac80211_hwsim_remove_interface,
	448	.config = mac80211_hwsim_config,
	449	.configure_filter = mac80211_hwsim_configure_filter,
8aa21e6f JB	450	.config_interface = mac80211_hwsim_config_interface,
	451	.bss_info_changed = mac80211_hwsim_bss_info_changed,
	452	.sta_notify = mac80211_hwsim_sta_notify,
81c06523	453	.set_tim = mac80211_hwsim_set_tim,
acc1e7a3 JM	454	};
	455
	456
	457	static void mac80211_hwsim_free(void)
	458	{
	459	int i;
	460
	461	for (i = 0; i < hwsim_radio_count; i++) {
	462	if (hwsim_radios[i]) {
	463	struct mac80211_hwsim_data *data;
	464	data = hwsim_radios[i]->priv;
	465	ieee80211_unregister_hw(hwsim_radios[i]);
3a33cc10	466	device_unregister(data->dev);
acc1e7a3 JM	467	ieee80211_free_hw(hwsim_radios[i]);
	468	}
	469	}
	470	kfree(hwsim_radios);
	471	class_destroy(hwsim_class);
	472	}
	473
	474
	475	static struct device_driver mac80211_hwsim_driver = {
	476	.name = "mac80211_hwsim"
	477	};
	478
	479
	480	static void hwsim_mon_setup(struct net_device *dev)
	481	{
	482	dev->hard_start_xmit = hwsim_mon_xmit;
	483	dev->destructor = free_netdev;
	484	ether_setup(dev);
	485	dev->tx_queue_len = 0;
	486	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	487	memset(dev->dev_addr, 0, ETH_ALEN);
	488	dev->dev_addr[0] = 0x12;
	489	}
	490
	491
	492	static int __init init_mac80211_hwsim(void)
	493	{
	494	int i, err = 0;
	495	u8 addr[ETH_ALEN];
	496	struct mac80211_hwsim_data *data;
	497	struct ieee80211_hw *hw;
	498	DECLARE_MAC_BUF(mac);
	499
	500	if (radios < 1 \|\| radios > 65535)
	501	return -EINVAL;
	502
	503	hwsim_radio_count = radios;
	504	hwsim_radios = kcalloc(hwsim_radio_count,
	505	sizeof(struct ieee80211_hw *), GFP_KERNEL);
	506	if (hwsim_radios == NULL)
	507	return -ENOMEM;
	508
	509	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
	510	if (IS_ERR(hwsim_class)) {
	511	kfree(hwsim_radios);
	512	return PTR_ERR(hwsim_class);
	513	}
	514
	515	memset(addr, 0, ETH_ALEN);
	516	addr[0] = 0x02;
	517
	518	for (i = 0; i < hwsim_radio_count; i++) {
	519	printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
	520	i);
	521	hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
	522	if (hw == NULL) {
	523	printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
	524	"failed\n");
	525	err = -ENOMEM;
	526	goto failed;
	527	}
	528	hwsim_radios[i] = hw;
	529
	530	data = hw->priv;
e800f17c SR	531	data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
e800f17c SR	532	"hwsim%d", i);
acc1e7a3	533	if (IS_ERR(data->dev)) {
e800f17c SR	534	printk(KERN_DEBUG
e800f17c SR	535	"mac80211_hwsim: device_create_drvdata "
acc1e7a3 JM	536	"failed (%ld)\n", PTR_ERR(data->dev));
acc1e7a3 JM	537	err = -ENOMEM;
3a33cc10	538	goto failed_drvdata;
acc1e7a3 JM	539	}
acc1e7a3 JM	540	data->dev->driver = &mac80211_hwsim_driver;
acc1e7a3 JM	541
	542	SET_IEEE80211_DEV(hw, data->dev);
	543	addr[3] = i >> 8;
	544	addr[4] = i;
	545	SET_IEEE80211_PERM_ADDR(hw, addr);
	546
	547	hw->channel_change_time = 1;
87e8b64e	548	hw->queues = 4;
f59ac048 LR	549	hw->wiphy->interface_modes =
	550	BIT(NL80211_IFTYPE_STATION) \|
	551	BIT(NL80211_IFTYPE_AP);
87e8b64e	552	hw->ampdu_queues = 1;
acc1e7a3	553
8aa21e6f JB	554	/* ask mac80211 to reserve space for magic */
8aa21e6f JB	555	hw->vif_data_size = sizeof(struct hwsim_vif_priv);
81c06523	556	hw->sta_data_size = sizeof(struct hwsim_sta_priv);
8aa21e6f	557
acc1e7a3 JM	558	memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
	559	memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
	560	data->band.channels = data->channels;
	561	data->band.n_channels = ARRAY_SIZE(hwsim_channels);
	562	data->band.bitrates = data->rates;
	563	data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
87e8b64e JM	564	data->band.ht_info.ht_supported = 1;
	565	data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH \|
	566	IEEE80211_HT_CAP_GRN_FLD \|
	567	IEEE80211_HT_CAP_SGI_40 \|
	568	IEEE80211_HT_CAP_DSSSCCK40;
	569	data->band.ht_info.ampdu_factor = 0x3;
	570	data->band.ht_info.ampdu_density = 0x6;
	571	memset(data->band.ht_info.supp_mcs_set, 0,
	572	sizeof(data->band.ht_info.supp_mcs_set));
	573	data->band.ht_info.supp_mcs_set[0] = 0xff;
	574	data->band.ht_info.supp_mcs_set[1] = 0xff;
	575	data->band.ht_info.supp_mcs_set[12] =
	576	IEEE80211_HT_CAP_MCS_TX_DEFINED;
acc1e7a3 JM	577	hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
	578
	579	err = ieee80211_register_hw(hw);
	580	if (err < 0) {
	581	printk(KERN_DEBUG "mac80211_hwsim: "
	582	"ieee80211_register_hw failed (%d)\n", err);
3a33cc10	583	goto failed_hw;
acc1e7a3 JM	584	}
	585
	586	printk(KERN_DEBUG "%s: hwaddr %s registered\n",
	587	wiphy_name(hw->wiphy),
	588	print_mac(mac, hw->wiphy->perm_addr));
	589
	590	setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
	591	(unsigned long) hw);
	592	}
	593
	594	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
	595	if (hwsim_mon == NULL)
	596	goto failed;
	597
	598	rtnl_lock();
	599
	600	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
3a33cc10	601	if (err < 0)
acc1e7a3	602	goto failed_mon;
3a33cc10	603
acc1e7a3 JM	604
	605	err = register_netdevice(hwsim_mon);
	606	if (err < 0)
	607	goto failed_mon;
	608
	609	rtnl_unlock();
	610
	611	return 0;
	612
	613	failed_mon:
	614	rtnl_unlock();
	615	free_netdev(hwsim_mon);
3a33cc10 IS	616	mac80211_hwsim_free();
3a33cc10 IS	617	return err;
acc1e7a3	618
3a33cc10 IS	619	failed_hw:
	620	device_unregister(data->dev);
	621	failed_drvdata:
	622	ieee80211_free_hw(hw);
0b06b2ae	623	hwsim_radios[i] = NULL;
acc1e7a3 JM	624	failed:
	625	mac80211_hwsim_free();
	626	return err;
	627	}
	628
	629
	630	static void __exit exit_mac80211_hwsim(void)
	631	{
	632	printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
	633	hwsim_radio_count);
	634
	635	unregister_netdev(hwsim_mon);
	636	mac80211_hwsim_free();
	637	}
	638
	639
	640	module_init(init_mac80211_hwsim);
	641	module_exit(exit_mac80211_hwsim);