[people/ms/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");


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 = 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(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	struct mac80211_hwsim_data *data = hw->priv;
	struct ieee80211_rx_status rx_status;
	int i, ack = 0;
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	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;
	}

	hdr = (struct ieee80211_hdr *) skb->data;

	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);
	}

	txi = IEEE80211_SKB_CB(skb);
	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));
	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));
}


static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_hw *hw = arg;
	struct mac80211_hwsim_data *data = hw->priv;
	struct sk_buff *skb;
	struct ieee80211_rx_status rx_status;
	int i;
	struct ieee80211_tx_info *info;

	if (vif->type != IEEE80211_IF_TYPE_AP)
		return;

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

	mac80211_hwsim_monitor_rx(hw, skb);

	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;

		ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
	}

	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 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,
};


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

		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 = 1;

		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);
		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;
		}

		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);

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
	31
	32	static struct class *hwsim_class;
	33
	34	static struct ieee80211_hw **hwsim_radios;
	35	static int hwsim_radio_count;
	36	static struct net_device hwsim_mon; / global monitor netdev */
	37
	38
	39	static const struct ieee80211_channel hwsim_channels[] = {
	40	{ .center_freq = 2412 },
	41	{ .center_freq = 2417 },
	42	{ .center_freq = 2422 },
	43	{ .center_freq = 2427 },
	44	{ .center_freq = 2432 },
	45	{ .center_freq = 2437 },
	46	{ .center_freq = 2442 },
	47	{ .center_freq = 2447 },
	48	{ .center_freq = 2452 },
	49	{ .center_freq = 2457 },
	50	{ .center_freq = 2462 },
	51	{ .center_freq = 2467 },
	52	{ .center_freq = 2472 },
	53	{ .center_freq = 2484 },
	54	};
	55
	56	static const struct ieee80211_rate hwsim_rates[] = {
	57	{ .bitrate = 10 },
	58	{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	59	{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	60	{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	61	{ .bitrate = 60 },
	62	{ .bitrate = 90 },
	63	{ .bitrate = 120 },
	64	{ .bitrate = 180 },
65	{ .bitrate = 240 },
66	{ .bitrate = 360 },
67	{ .bitrate = 480 },
68	{ .bitrate = 540 }
69	};
70
71	struct mac80211_hwsim_data {
72	struct device *dev;
73	struct ieee80211_supported_band band;
74	struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
75	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
76
77	struct ieee80211_channel *channel;
78	int radio_enabled;
79	unsigned long beacon_int; /* in jiffies unit */
80	unsigned int rx_filter;
81	int started;
82	struct timer_list beacon_timer;
83	};
84
85
86	struct hwsim_radiotap_hdr {
87	struct ieee80211_radiotap_header hdr;
88	u8 rt_flags;
89	u8 rt_rate;
90	__le16 rt_channel;
91	__le16 rt_chbitmask;
92	} __attribute__ ((packed));
93
94
95	static int hwsim_mon_xmit(struct sk_buff skb, struct net_device dev)
96	{
97	/* TODO: allow packet injection */
98	dev_kfree_skb(skb);
99	return 0;
100	}
101
102
103	static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
104	struct sk_buff *tx_skb)
105	{
106	struct mac80211_hwsim_data *data = hw->priv;
107	struct sk_buff *skb;
108	struct hwsim_radiotap_hdr *hdr;
109	u16 flags;
110	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
111	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
112
113	if (!netif_running(hwsim_mon))
114	return;
115
116	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
117	if (skb == NULL)
118	return;
119
120	hdr = (struct hwsim_radiotap_hdr ) skb_push(skb, sizeof(hdr));
121	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
122	hdr->hdr.it_pad = 0;
123	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
f248f105 JM	124	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) \|
	125	(1 << IEEE80211_RADIOTAP_RATE) \|
	126	(1 << IEEE80211_RADIOTAP_CHANNEL));
acc1e7a3 JM	127	hdr->rt_flags = 0;
	128	hdr->rt_rate = txrate->bitrate / 5;
	129	hdr->rt_channel = data->channel->center_freq;
	130	flags = IEEE80211_CHAN_2GHZ;
	131	if (txrate->flags & IEEE80211_RATE_ERP_G)
	132	flags \|= IEEE80211_CHAN_OFDM;
	133	else
	134	flags \|= IEEE80211_CHAN_CCK;
	135	hdr->rt_chbitmask = cpu_to_le16(flags);
	136
	137	skb->dev = hwsim_mon;
	138	skb_set_mac_header(skb, 0);
	139	skb->ip_summed = CHECKSUM_UNNECESSARY;
	140	skb->pkt_type = PACKET_OTHERHOST;
f248f105	141	skb->protocol = htons(ETH_P_802_2);
acc1e7a3 JM	142	memset(skb->cb, 0, sizeof(skb->cb));
	143	netif_rx(skb);
	144	}
	145
	146
	147	static int mac80211_hwsim_tx(struct ieee80211_hw hw, struct sk_buff skb)
	148	{
	149	struct mac80211_hwsim_data *data = hw->priv;
	150	struct ieee80211_rx_status rx_status;
	151	int i, ack = 0;
	152	struct ieee80211_hdr *hdr;
	153	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	154	struct ieee80211_tx_info *txi;
	155
	156	mac80211_hwsim_monitor_rx(hw, skb);
	157
	158	if (skb->len < 10) {
	159	/* Should not happen; just a sanity check for addr1 use */
	160	dev_kfree_skb(skb);
	161	return NETDEV_TX_OK;
	162	}
	163
	164	if (!data->radio_enabled) {
	165	printk(KERN_DEBUG "%s: dropped TX frame since radio "
	166	"disabled\n", wiphy_name(hw->wiphy));
	167	dev_kfree_skb(skb);
	168	return NETDEV_TX_OK;
	169	}
	170
	171	hdr = (struct ieee80211_hdr *) skb->data;
	172
	173	memset(&rx_status, 0, sizeof(rx_status));
	174	/* TODO: set mactime */
	175	rx_status.freq = data->channel->center_freq;
	176	rx_status.band = data->channel->band;
	177	rx_status.rate_idx = info->tx_rate_idx;
	178	/* TODO: simulate signal strength (and optional packet drop) */
	179
	180	/* Copy skb to all enabled radios that are on the current frequency */
	181	for (i = 0; i < hwsim_radio_count; i++) {
	182	struct mac80211_hwsim_data *data2;
	183	struct sk_buff *nskb;
	184
	185	if (hwsim_radios[i] == NULL \|\| hwsim_radios[i] == hw)
	186	continue;
	187	data2 = hwsim_radios[i]->priv;
	188	if (!data2->started \|\| !data2->radio_enabled \|\|
	189	data->channel->center_freq != data2->channel->center_freq)
	190	continue;
	191
	192	nskb = skb_copy(skb, GFP_ATOMIC);
	193	if (nskb == NULL)
	194	continue;
	195
	196	if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr,
	197	ETH_ALEN) == 0)
	198	ack = 1;
	199	ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
	200	}
	201
	202	txi = IEEE80211_SKB_CB(skb);
	203	memset(&txi->status, 0, sizeof(txi->status));
	204	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
	205	if (ack)
206	txi->flags \|= IEEE80211_TX_STAT_ACK;
207	else
208	txi->status.excessive_retries = 1;
209	}
210	ieee80211_tx_status_irqsafe(hw, skb);
211	return NETDEV_TX_OK;
212	}
213
214
215	static int mac80211_hwsim_start(struct ieee80211_hw *hw)
216	{
217	struct mac80211_hwsim_data *data = hw->priv;
218	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
219	data->started = 1;
220	return 0;
221	}
222
223
224	static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
225	{
226	struct mac80211_hwsim_data *data = hw->priv;
227	data->started = 0;
228	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
229	}
230
231
232	static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
233	struct ieee80211_if_init_conf *conf)
234	{
235	DECLARE_MAC_BUF(mac);
236	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
237	wiphy_name(hw->wiphy), __func__, conf->type,
238	print_mac(mac, conf->mac_addr));
239	return 0;
240	}
241
242
243	static void mac80211_hwsim_remove_interface(
244	struct ieee80211_hw hw, struct ieee80211_if_init_conf conf)
245	{
246	DECLARE_MAC_BUF(mac);
247	printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
248	wiphy_name(hw->wiphy), __func__, conf->type,
249	print_mac(mac, conf->mac_addr));
250	}
251
252
253	static void mac80211_hwsim_beacon_tx(void arg, u8 mac,
254	struct ieee80211_vif *vif)
255	{
256	struct ieee80211_hw *hw = arg;
257	struct mac80211_hwsim_data *data = hw->priv;
258	struct sk_buff *skb;
259	struct ieee80211_rx_status rx_status;
260	int i;
261	struct ieee80211_tx_info *info;
262
263	if (vif->type != IEEE80211_IF_TYPE_AP)
264	return;
265
266	skb = ieee80211_beacon_get(hw, vif);
267	if (skb == NULL)
268	return;
269	info = IEEE80211_SKB_CB(skb);
270
271	mac80211_hwsim_monitor_rx(hw, skb);
272
273	memset(&rx_status, 0, sizeof(rx_status));
274	/* TODO: set mactime */
275	rx_status.freq = data->channel->center_freq;
276	rx_status.band = data->channel->band;
277	rx_status.rate_idx = info->tx_rate_idx;
278	/* TODO: simulate signal strength (and optional packet drop) */
279
280	/* Copy skb to all enabled radios that are on the current frequency */
281	for (i = 0; i < hwsim_radio_count; i++) {
282	struct mac80211_hwsim_data *data2;
283	struct sk_buff *nskb;
284
285	if (hwsim_radios[i] == NULL \|\| hwsim_radios[i] == hw)
286	continue;
287	data2 = hwsim_radios[i]->priv;
288	if (!data2->started \|\| !data2->radio_enabled \|\|
289	data->channel->center_freq != data2->channel->center_freq)
290	continue;
291
292	nskb = skb_copy(skb, GFP_ATOMIC);
293	if (nskb == NULL)
294	continue;
295
296	ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
297	}
298
299	dev_kfree_skb(skb);
300	}
301
302
303	static void mac80211_hwsim_beacon(unsigned long arg)
304	{
305	struct ieee80211_hw hw = (struct ieee80211_hw ) arg;
306	struct mac80211_hwsim_data *data = hw->priv;
307
308	if (!data->started \|\| !data->radio_enabled)
309	return;
310
f248f105 JM	311	ieee80211_iterate_active_interfaces_atomic(
f248f105 JM	312	hw, mac80211_hwsim_beacon_tx, hw);
acc1e7a3 JM	313
	314	data->beacon_timer.expires = jiffies + data->beacon_int;
	315	add_timer(&data->beacon_timer);
	316	}
	317
	318
	319	static int mac80211_hwsim_config(struct ieee80211_hw *hw,
	320	struct ieee80211_conf *conf)
	321	{
	322	struct mac80211_hwsim_data *data = hw->priv;
	323
	324	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
	325	wiphy_name(hw->wiphy), __func__,
	326	conf->channel->center_freq, conf->radio_enabled,
	327	conf->beacon_int);
	328
	329	data->channel = conf->channel;
	330	data->radio_enabled = conf->radio_enabled;
	331	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
	332	if (data->beacon_int < 1)
	333	data->beacon_int = 1;
	334
	335	if (!data->started \|\| !data->radio_enabled)
	336	del_timer(&data->beacon_timer);
	337	else
	338	mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
	339
	340	return 0;
	341	}
	342
	343
	344	static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
	345	unsigned int changed_flags,
	346	unsigned int *total_flags,
	347	int mc_count,
	348	struct dev_addr_list *mc_list)
	349	{
	350	struct mac80211_hwsim_data *data = hw->priv;
	351
	352	printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
	353
	354	data->rx_filter = 0;
	355	if (*total_flags & FIF_PROMISC_IN_BSS)
	356	data->rx_filter \|= FIF_PROMISC_IN_BSS;
	357	if (*total_flags & FIF_ALLMULTI)
	358	data->rx_filter \|= FIF_ALLMULTI;
	359
	360	*total_flags = data->rx_filter;
	361	}
	362
	363
	364
	365	static const struct ieee80211_ops mac80211_hwsim_ops =
	366	{
	367	.tx = mac80211_hwsim_tx,
	368	.start = mac80211_hwsim_start,
	369	.stop = mac80211_hwsim_stop,
	370	.add_interface = mac80211_hwsim_add_interface,
	371	.remove_interface = mac80211_hwsim_remove_interface,
	372	.config = mac80211_hwsim_config,
	373	.configure_filter = mac80211_hwsim_configure_filter,
	374	};
	375
	376
377	static void mac80211_hwsim_free(void)
378	{
379	int i;
380
381	for (i = 0; i < hwsim_radio_count; i++) {
382	if (hwsim_radios[i]) {
383	struct mac80211_hwsim_data *data;
384	data = hwsim_radios[i]->priv;
385	ieee80211_unregister_hw(hwsim_radios[i]);
386	if (!IS_ERR(data->dev))
387	device_unregister(data->dev);
388	ieee80211_free_hw(hwsim_radios[i]);
389	}
390	}
391	kfree(hwsim_radios);
392	class_destroy(hwsim_class);
393	}
394
395
396	static struct device_driver mac80211_hwsim_driver = {
397	.name = "mac80211_hwsim"
398	};
399
400
401	static void hwsim_mon_setup(struct net_device *dev)
402	{
403	dev->hard_start_xmit = hwsim_mon_xmit;
404	dev->destructor = free_netdev;
405	ether_setup(dev);
406	dev->tx_queue_len = 0;
407	dev->type = ARPHRD_IEEE80211_RADIOTAP;
408	memset(dev->dev_addr, 0, ETH_ALEN);
409	dev->dev_addr[0] = 0x12;
410	}
411
412
413	static int __init init_mac80211_hwsim(void)
414	{
415	int i, err = 0;
416	u8 addr[ETH_ALEN];
417	struct mac80211_hwsim_data *data;
418	struct ieee80211_hw *hw;
419	DECLARE_MAC_BUF(mac);
420
421	if (radios < 1 \|\| radios > 65535)
422	return -EINVAL;
423
424	hwsim_radio_count = radios;
425	hwsim_radios = kcalloc(hwsim_radio_count,
426	sizeof(struct ieee80211_hw *), GFP_KERNEL);
427	if (hwsim_radios == NULL)
428	return -ENOMEM;
429
430	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
431	if (IS_ERR(hwsim_class)) {
432	kfree(hwsim_radios);
433	return PTR_ERR(hwsim_class);
434	}
435
436	memset(addr, 0, ETH_ALEN);
437	addr[0] = 0x02;
438
439	for (i = 0; i < hwsim_radio_count; i++) {
440	printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
441	i);
442	hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
443	if (hw == NULL) {
444	printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
445	"failed\n");
446	err = -ENOMEM;
447	goto failed;
448	}
449	hwsim_radios[i] = hw;
450
451	data = hw->priv;
452	data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
453	if (IS_ERR(data->dev)) {
454	printk(KERN_DEBUG "mac80211_hwsim: device_create "
455	"failed (%ld)\n", PTR_ERR(data->dev));
456	err = -ENOMEM;
457	goto failed;
458	}
459	data->dev->driver = &mac80211_hwsim_driver;
460	dev_set_drvdata(data->dev, hw);
461
462	SET_IEEE80211_DEV(hw, data->dev);
463	addr[3] = i >> 8;
464	addr[4] = i;
465	SET_IEEE80211_PERM_ADDR(hw, addr);
466
467	hw->channel_change_time = 1;
468	hw->queues = 1;
469
470	memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
471	memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
472	data->band.channels = data->channels;
473	data->band.n_channels = ARRAY_SIZE(hwsim_channels);
474	data->band.bitrates = data->rates;
475	data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
476	hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
477
478	err = ieee80211_register_hw(hw);
479	if (err < 0) {
480	printk(KERN_DEBUG "mac80211_hwsim: "
481	"ieee80211_register_hw failed (%d)\n", err);
482	goto failed;
483	}
484
485	printk(KERN_DEBUG "%s: hwaddr %s registered\n",
486	wiphy_name(hw->wiphy),
487	print_mac(mac, hw->wiphy->perm_addr));
488
489	setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
490	(unsigned long) hw);
491	}
492
493	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
494	if (hwsim_mon == NULL)
495	goto failed;
496
497	rtnl_lock();
498
499	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
500	if (err < 0) {
501	goto failed_mon;
502	}
503
504	err = register_netdevice(hwsim_mon);
505	if (err < 0)
506	goto failed_mon;
507
508	rtnl_unlock();
509
510	return 0;
511
512	failed_mon:
513	rtnl_unlock();
514	free_netdev(hwsim_mon);
515
516	failed:
517	mac80211_hwsim_free();
518	return err;
519	}
520
521
522	static void __exit exit_mac80211_hwsim(void)
523	{
524	printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
525	hwsim_radio_count);
526
527	unregister_netdev(hwsim_mon);
528	mac80211_hwsim_free();
529	}
530
531
532	module_init(init_mac80211_hwsim);
533	module_exit(exit_mac80211_hwsim);