[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 <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;
}

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);

	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, const u8 *addr)
{
	hwsim_check_magic(vif);
}

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,
};


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);

		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 JM	54
	55	static struct class *hwsim_class;
	56
	57	static struct ieee80211_hw **hwsim_radios;
	58	static int hwsim_radio_count;
	59	static struct net_device hwsim_mon; / global monitor netdev */
	60
	61
	62	static const struct ieee80211_channel hwsim_channels[] = {
	63	{ .center_freq = 2412 },
	64	{ .center_freq = 2417 },
	65	{ .center_freq = 2422 },
	66	{ .center_freq = 2427 },
	67	{ .center_freq = 2432 },
	68	{ .center_freq = 2437 },
	69	{ .center_freq = 2442 },
	70	{ .center_freq = 2447 },
	71	{ .center_freq = 2452 },
	72	{ .center_freq = 2457 },
	73	{ .center_freq = 2462 },
	74	{ .center_freq = 2467 },
	75	{ .center_freq = 2472 },
	76	{ .center_freq = 2484 },
	77	};
	78
	79	static const struct ieee80211_rate hwsim_rates[] = {
	80	{ .bitrate = 10 },
	81	{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	82	{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	83	{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	84	{ .bitrate = 60 },
	85	{ .bitrate = 90 },
	86	{ .bitrate = 120 },
	87	{ .bitrate = 180 },
	88	{ .bitrate = 240 },
	89	{ .bitrate = 360 },
	90	{ .bitrate = 480 },
	91	{ .bitrate = 540 }
	92	};
	93
	94	struct mac80211_hwsim_data {
	95	struct device *dev;
	96	struct ieee80211_supported_band band;
	97	struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
	98	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
	99
	100	struct ieee80211_channel *channel;
	101	int radio_enabled;
	102	unsigned long beacon_int; /* in jiffies unit */
	103	unsigned int rx_filter;
	104	int started;
	105	struct timer_list beacon_timer;
	106	};
	107
	108
	109	struct hwsim_radiotap_hdr {
	110	struct ieee80211_radiotap_header hdr;
	111	u8 rt_flags;
	112	u8 rt_rate;
	113	__le16 rt_channel;
	114	__le16 rt_chbitmask;
	115	} __attribute__ ((packed));
	116
	117
118	static int hwsim_mon_xmit(struct sk_buff skb, struct net_device dev)
119	{
120	/* TODO: allow packet injection */
121	dev_kfree_skb(skb);
122	return 0;
123	}
124
125
126	static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
127	struct sk_buff *tx_skb)
128	{
129	struct mac80211_hwsim_data *data = hw->priv;
130	struct sk_buff *skb;
131	struct hwsim_radiotap_hdr *hdr;
132	u16 flags;
133	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
134	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
135
136	if (!netif_running(hwsim_mon))
137	return;
138
139	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
140	if (skb == NULL)
141	return;
142
143	hdr = (struct hwsim_radiotap_hdr ) skb_push(skb, sizeof(hdr));
144	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
145	hdr->hdr.it_pad = 0;
146	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
f248f105 JM	147	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) \|
	148	(1 << IEEE80211_RADIOTAP_RATE) \|
	149	(1 << IEEE80211_RADIOTAP_CHANNEL));
acc1e7a3 JM	150	hdr->rt_flags = 0;
acc1e7a3 JM	151	hdr->rt_rate = txrate->bitrate / 5;
df70b4ac	152	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
acc1e7a3 JM	153	flags = IEEE80211_CHAN_2GHZ;
	154	if (txrate->flags & IEEE80211_RATE_ERP_G)
	155	flags \|= IEEE80211_CHAN_OFDM;
	156	else
	157	flags \|= IEEE80211_CHAN_CCK;
	158	hdr->rt_chbitmask = cpu_to_le16(flags);
	159
	160	skb->dev = hwsim_mon;
	161	skb_set_mac_header(skb, 0);
	162	skb->ip_summed = CHECKSUM_UNNECESSARY;
	163	skb->pkt_type = PACKET_OTHERHOST;
f248f105	164	skb->protocol = htons(ETH_P_802_2);
acc1e7a3 JM	165	memset(skb->cb, 0, sizeof(skb->cb));
	166	netif_rx(skb);
	167	}
	168
	169
e36cfdc9 JM	170	static int mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
e36cfdc9 JM	171	struct sk_buff *skb)
acc1e7a3 JM	172	{
acc1e7a3 JM	173	struct mac80211_hwsim_data *data = hw->priv;
acc1e7a3	174	int i, ack = 0;
e36cfdc9	175	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
acc1e7a3	176	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e36cfdc9	177	struct ieee80211_rx_status rx_status;
acc1e7a3 JM	178
	179	memset(&rx_status, 0, sizeof(rx_status));
	180	/* TODO: set mactime */
	181	rx_status.freq = data->channel->center_freq;
	182	rx_status.band = data->channel->band;
	183	rx_status.rate_idx = info->tx_rate_idx;
	184	/* TODO: simulate signal strength (and optional packet drop) */
	185
	186	/* Copy skb to all enabled radios that are on the current frequency */
	187	for (i = 0; i < hwsim_radio_count; i++) {
	188	struct mac80211_hwsim_data *data2;
	189	struct sk_buff *nskb;
	190
	191	if (hwsim_radios[i] == NULL \|\| hwsim_radios[i] == hw)
	192	continue;
	193	data2 = hwsim_radios[i]->priv;
	194	if (!data2->started \|\| !data2->radio_enabled \|\|
	195	data->channel->center_freq != data2->channel->center_freq)
	196	continue;
	197
	198	nskb = skb_copy(skb, GFP_ATOMIC);
	199	if (nskb == NULL)
	200	continue;
	201
	202	if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr,
	203	ETH_ALEN) == 0)
	204	ack = 1;
	205	ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
	206	}
	207
e36cfdc9 JM	208	return ack;
	209	}
	210
	211
	212	static int mac80211_hwsim_tx(struct ieee80211_hw hw, struct sk_buff skb)
	213	{
	214	struct mac80211_hwsim_data *data = hw->priv;
	215	int ack;
	216	struct ieee80211_tx_info *txi;
	217
	218	mac80211_hwsim_monitor_rx(hw, skb);
	219
	220	if (skb->len < 10) {
	221	/* Should not happen; just a sanity check for addr1 use */
	222	dev_kfree_skb(skb);
	223	return NETDEV_TX_OK;
	224	}
	225
	226	if (!data->radio_enabled) {
	227	printk(KERN_DEBUG "%s: dropped TX frame since radio "
	228	"disabled\n", wiphy_name(hw->wiphy));
	229	dev_kfree_skb(skb);
	230	return NETDEV_TX_OK;
	231	}
	232
	233	ack = mac80211_hwsim_tx_frame(hw, skb);
	234
acc1e7a3	235	txi = IEEE80211_SKB_CB(skb);
8aa21e6f JB	236
	237	hwsim_check_magic(txi->control.vif);
	238
acc1e7a3 JM	239	memset(&txi->status, 0, sizeof(txi->status));
	240	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
	241	if (ack)
	242	txi->flags \|= IEEE80211_TX_STAT_ACK;
	243	else
	244	txi->status.excessive_retries = 1;
	245	}
	246	ieee80211_tx_status_irqsafe(hw, skb);
	247	return NETDEV_TX_OK;
	248	}
	249
	250
	251	static int mac80211_hwsim_start(struct ieee80211_hw *hw)
	252	{
	253	struct mac80211_hwsim_data *data = hw->priv;
	254	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	255	data->started = 1;
	256	return 0;
	257	}
	258
	259
	260	static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
	261	{
	262	struct mac80211_hwsim_data *data = hw->priv;
	263	data->started = 0;
	264	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	265	}
	266
	267
	268	static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
	269	struct ieee80211_if_init_conf *conf)
	270	{
	271	DECLARE_MAC_BUF(mac);
	272	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	273	wiphy_name(hw->wiphy), __func__, conf->type,
	274	print_mac(mac, conf->mac_addr));
8aa21e6f	275	hwsim_set_magic(conf->vif);
acc1e7a3 JM	276	return 0;
	277	}
	278
	279
	280	static void mac80211_hwsim_remove_interface(
	281	struct ieee80211_hw hw, struct ieee80211_if_init_conf conf)
	282	{
	283	DECLARE_MAC_BUF(mac);
	284	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
	285	wiphy_name(hw->wiphy), __func__, conf->type,
	286	print_mac(mac, conf->mac_addr));
8aa21e6f JB	287	hwsim_check_magic(conf->vif);
8aa21e6f JB	288	hwsim_clear_magic(conf->vif);
acc1e7a3 JM	289	}
	290
	291
	292	static void mac80211_hwsim_beacon_tx(void arg, u8 mac,
	293	struct ieee80211_vif *vif)
	294	{
	295	struct ieee80211_hw *hw = arg;
acc1e7a3	296	struct sk_buff *skb;
acc1e7a3 JM	297	struct ieee80211_tx_info *info;
acc1e7a3 JM	298
8aa21e6f JB	299	hwsim_check_magic(vif);
8aa21e6f JB	300
05c914fe	301	if (vif->type != NL80211_IFTYPE_AP)
acc1e7a3 JM	302	return;
	303
	304	skb = ieee80211_beacon_get(hw, vif);
	305	if (skb == NULL)
	306	return;
	307	info = IEEE80211_SKB_CB(skb);
	308
	309	mac80211_hwsim_monitor_rx(hw, skb);
e36cfdc9	310	mac80211_hwsim_tx_frame(hw, skb);
acc1e7a3 JM	311	dev_kfree_skb(skb);
	312	}
	313
	314
	315	static void mac80211_hwsim_beacon(unsigned long arg)
	316	{
	317	struct ieee80211_hw hw = (struct ieee80211_hw ) arg;
	318	struct mac80211_hwsim_data *data = hw->priv;
	319
	320	if (!data->started \|\| !data->radio_enabled)
	321	return;
	322
f248f105 JM	323	ieee80211_iterate_active_interfaces_atomic(
f248f105 JM	324	hw, mac80211_hwsim_beacon_tx, hw);
acc1e7a3 JM	325
	326	data->beacon_timer.expires = jiffies + data->beacon_int;
	327	add_timer(&data->beacon_timer);
	328	}
	329
	330
	331	static int mac80211_hwsim_config(struct ieee80211_hw *hw,
	332	struct ieee80211_conf *conf)
	333	{
	334	struct mac80211_hwsim_data *data = hw->priv;
	335
	336	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
	337	wiphy_name(hw->wiphy), __func__,
	338	conf->channel->center_freq, conf->radio_enabled,
	339	conf->beacon_int);
	340
	341	data->channel = conf->channel;
	342	data->radio_enabled = conf->radio_enabled;
	343	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
	344	if (data->beacon_int < 1)
	345	data->beacon_int = 1;
	346
	347	if (!data->started \|\| !data->radio_enabled)
	348	del_timer(&data->beacon_timer);
	349	else
	350	mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
	351
	352	return 0;
	353	}
	354
	355
	356	static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
	357	unsigned int changed_flags,
	358	unsigned int *total_flags,
	359	int mc_count,
	360	struct dev_addr_list *mc_list)
	361	{
	362	struct mac80211_hwsim_data *data = hw->priv;
	363
	364	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	365
	366	data->rx_filter = 0;
	367	if (*total_flags & FIF_PROMISC_IN_BSS)
	368	data->rx_filter \|= FIF_PROMISC_IN_BSS;
	369	if (*total_flags & FIF_ALLMULTI)
	370	data->rx_filter \|= FIF_ALLMULTI;
	371
	372	*total_flags = data->rx_filter;
	373	}
	374
8aa21e6f JB	375	static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
	376	struct ieee80211_vif *vif,
	377	struct ieee80211_if_conf *conf)
	378	{
	379	hwsim_check_magic(vif);
	380	return 0;
	381	}
acc1e7a3	382
8aa21e6f JB	383	static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
	384	struct ieee80211_vif *vif,
	385	struct ieee80211_bss_conf *info,
	386	u32 changed)
	387	{
	388	hwsim_check_magic(vif);
	389	}
	390
	391	static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
	392	struct ieee80211_vif *vif,
	393	enum sta_notify_cmd cmd, const u8 *addr)
	394	{
	395	hwsim_check_magic(vif);
	396	}
acc1e7a3 JM	397
	398	static const struct ieee80211_ops mac80211_hwsim_ops =
	399	{
	400	.tx = mac80211_hwsim_tx,
	401	.start = mac80211_hwsim_start,
	402	.stop = mac80211_hwsim_stop,
	403	.add_interface = mac80211_hwsim_add_interface,
	404	.remove_interface = mac80211_hwsim_remove_interface,
	405	.config = mac80211_hwsim_config,
	406	.configure_filter = mac80211_hwsim_configure_filter,
8aa21e6f JB	407	.config_interface = mac80211_hwsim_config_interface,
	408	.bss_info_changed = mac80211_hwsim_bss_info_changed,
	409	.sta_notify = mac80211_hwsim_sta_notify,
acc1e7a3 JM	410	};
	411
	412
	413	static void mac80211_hwsim_free(void)
	414	{
	415	int i;
	416
	417	for (i = 0; i < hwsim_radio_count; i++) {
	418	if (hwsim_radios[i]) {
	419	struct mac80211_hwsim_data *data;
	420	data = hwsim_radios[i]->priv;
	421	ieee80211_unregister_hw(hwsim_radios[i]);
3a33cc10	422	device_unregister(data->dev);
acc1e7a3 JM	423	ieee80211_free_hw(hwsim_radios[i]);
	424	}
	425	}
	426	kfree(hwsim_radios);
	427	class_destroy(hwsim_class);
	428	}
	429
	430
	431	static struct device_driver mac80211_hwsim_driver = {
	432	.name = "mac80211_hwsim"
	433	};
	434
	435
	436	static void hwsim_mon_setup(struct net_device *dev)
	437	{
	438	dev->hard_start_xmit = hwsim_mon_xmit;
	439	dev->destructor = free_netdev;
	440	ether_setup(dev);
	441	dev->tx_queue_len = 0;
	442	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	443	memset(dev->dev_addr, 0, ETH_ALEN);
	444	dev->dev_addr[0] = 0x12;
	445	}
	446
	447
	448	static int __init init_mac80211_hwsim(void)
	449	{
	450	int i, err = 0;
	451	u8 addr[ETH_ALEN];
	452	struct mac80211_hwsim_data *data;
	453	struct ieee80211_hw *hw;
	454	DECLARE_MAC_BUF(mac);
	455
	456	if (radios < 1 \|\| radios > 65535)
	457	return -EINVAL;
	458
	459	hwsim_radio_count = radios;
	460	hwsim_radios = kcalloc(hwsim_radio_count,
	461	sizeof(struct ieee80211_hw *), GFP_KERNEL);
	462	if (hwsim_radios == NULL)
	463	return -ENOMEM;
	464
	465	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
	466	if (IS_ERR(hwsim_class)) {
	467	kfree(hwsim_radios);
	468	return PTR_ERR(hwsim_class);
	469	}
	470
	471	memset(addr, 0, ETH_ALEN);
	472	addr[0] = 0x02;
	473
	474	for (i = 0; i < hwsim_radio_count; i++) {
	475	printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
	476	i);
	477	hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
	478	if (hw == NULL) {
	479	printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
	480	"failed\n");
	481	err = -ENOMEM;
	482	goto failed;
	483	}
	484	hwsim_radios[i] = hw;
	485
	486	data = hw->priv;
e800f17c SR	487	data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
e800f17c SR	488	"hwsim%d", i);
acc1e7a3	489	if (IS_ERR(data->dev)) {
e800f17c SR	490	printk(KERN_DEBUG
e800f17c SR	491	"mac80211_hwsim: device_create_drvdata "
acc1e7a3 JM	492	"failed (%ld)\n", PTR_ERR(data->dev));
acc1e7a3 JM	493	err = -ENOMEM;
3a33cc10	494	goto failed_drvdata;
acc1e7a3 JM	495	}
acc1e7a3 JM	496	data->dev->driver = &mac80211_hwsim_driver;
acc1e7a3 JM	497
	498	SET_IEEE80211_DEV(hw, data->dev);
	499	addr[3] = i >> 8;
	500	addr[4] = i;
	501	SET_IEEE80211_PERM_ADDR(hw, addr);
	502
	503	hw->channel_change_time = 1;
87e8b64e	504	hw->queues = 4;
f59ac048 LR	505	hw->wiphy->interface_modes =
	506	BIT(NL80211_IFTYPE_STATION) \|
	507	BIT(NL80211_IFTYPE_AP);
87e8b64e	508	hw->ampdu_queues = 1;
acc1e7a3	509
8aa21e6f JB	510	/* ask mac80211 to reserve space for magic */
	511	hw->vif_data_size = sizeof(struct hwsim_vif_priv);
	512
acc1e7a3 JM	513	memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
	514	memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
	515	data->band.channels = data->channels;
	516	data->band.n_channels = ARRAY_SIZE(hwsim_channels);
	517	data->band.bitrates = data->rates;
	518	data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
87e8b64e JM	519	data->band.ht_info.ht_supported = 1;
	520	data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH \|
	521	IEEE80211_HT_CAP_GRN_FLD \|
	522	IEEE80211_HT_CAP_SGI_40 \|
	523	IEEE80211_HT_CAP_DSSSCCK40;
	524	data->band.ht_info.ampdu_factor = 0x3;
	525	data->band.ht_info.ampdu_density = 0x6;
	526	memset(data->band.ht_info.supp_mcs_set, 0,
	527	sizeof(data->band.ht_info.supp_mcs_set));
	528	data->band.ht_info.supp_mcs_set[0] = 0xff;
	529	data->band.ht_info.supp_mcs_set[1] = 0xff;
	530	data->band.ht_info.supp_mcs_set[12] =
	531	IEEE80211_HT_CAP_MCS_TX_DEFINED;
acc1e7a3 JM	532	hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
	533
	534	err = ieee80211_register_hw(hw);
	535	if (err < 0) {
	536	printk(KERN_DEBUG "mac80211_hwsim: "
	537	"ieee80211_register_hw failed (%d)\n", err);
3a33cc10	538	goto failed_hw;
acc1e7a3 JM	539	}
	540
	541	printk(KERN_DEBUG "%s: hwaddr %s registered\n",
	542	wiphy_name(hw->wiphy),
	543	print_mac(mac, hw->wiphy->perm_addr));
	544
	545	setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
	546	(unsigned long) hw);
	547	}
	548
	549	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
	550	if (hwsim_mon == NULL)
	551	goto failed;
	552
	553	rtnl_lock();
	554
	555	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
3a33cc10	556	if (err < 0)
acc1e7a3	557	goto failed_mon;
3a33cc10	558
acc1e7a3 JM	559
	560	err = register_netdevice(hwsim_mon);
	561	if (err < 0)
	562	goto failed_mon;
	563
	564	rtnl_unlock();
	565
	566	return 0;
	567
	568	failed_mon:
	569	rtnl_unlock();
	570	free_netdev(hwsim_mon);
3a33cc10 IS	571	mac80211_hwsim_free();
3a33cc10 IS	572	return err;
acc1e7a3	573
3a33cc10 IS	574	failed_hw:
	575	device_unregister(data->dev);
	576	failed_drvdata:
	577	ieee80211_free_hw(hw);
0b06b2ae	578	hwsim_radios[i] = NULL;
acc1e7a3 JM	579	failed:
	580	mac80211_hwsim_free();
	581	return err;
	582	}
	583
	584
	585	static void __exit exit_mac80211_hwsim(void)
	586	{
	587	printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
	588	hwsim_radio_count);
	589
	590	unregister_netdev(hwsim_mon);
	591	mac80211_hwsim_free();
	592	}
	593
	594
	595	module_init(init_mac80211_hwsim);
	596	module_exit(exit_mac80211_hwsim);