2 * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
3 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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.
12 * - periodic Beacon transmission in AP mode
13 * - IBSS mode simulation (Beacon transmission with competion for "air time")
14 * - IEEE 802.11a and 802.11n modes
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
22 MODULE_AUTHOR("Jouni Malinen");
23 MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
24 MODULE_LICENSE("GPL");
26 static int radios = 2;
27 module_param(radios, int, 0444);
28 MODULE_PARM_DESC(radios, "Number of simulated radios");
31 static struct class *hwsim_class;
33 static struct ieee80211_hw **hwsim_radios;
34 static int hwsim_radio_count;
35 static struct net_device *hwsim_mon; /* global monitor netdev */
38 static const struct ieee80211_channel hwsim_channels[] = {
39 { .chan = 1, .freq = 2412, .val = 1 },
40 { .chan = 2, .freq = 2417, .val = 2 },
41 { .chan = 3, .freq = 2422, .val = 3 },
42 { .chan = 4, .freq = 2427, .val = 4 },
43 { .chan = 5, .freq = 2432, .val = 5 },
44 { .chan = 6, .freq = 2437, .val = 6 },
45 { .chan = 7, .freq = 2442, .val = 7 },
46 { .chan = 8, .freq = 2447, .val = 8 },
47 { .chan = 9, .freq = 2452, .val = 9 },
48 { .chan = 10, .freq = 2457, .val = 10 },
49 { .chan = 11, .freq = 2462, .val = 11 },
50 { .chan = 12, .freq = 2467, .val = 12 },
51 { .chan = 13, .freq = 2472, .val = 13 },
52 { .chan = 14, .freq = 2484, .val = 14 },
55 static const struct ieee80211_rate hwsim_rates[] = {
56 { .rate = 10, .val = 10, .flags = IEEE80211_RATE_CCK },
57 { .rate = 20, .val = 20, .val2 = 21, .flags = IEEE80211_RATE_CCK_2 },
58 { .rate = 55, .val = 55, .val2 = 56, .flags = IEEE80211_RATE_CCK_2 },
59 { .rate = 110, .val = 110, .val2 = 111,
60 .flags = IEEE80211_RATE_CCK_2 },
61 { .rate = 60, .val = 60, .flags = IEEE80211_RATE_OFDM },
62 { .rate = 90, .val = 90, .flags = IEEE80211_RATE_OFDM },
63 { .rate = 120, .val = 120, .flags = IEEE80211_RATE_OFDM },
64 { .rate = 180, .val = 180, .flags = IEEE80211_RATE_OFDM },
65 { .rate = 240, .val = 240, .flags = IEEE80211_RATE_OFDM },
66 { .rate = 360, .val = 360, .flags = IEEE80211_RATE_OFDM },
67 { .rate = 480, .val = 480, .flags = IEEE80211_RATE_OFDM },
68 { .rate = 540, .val = 540, .flags = IEEE80211_RATE_OFDM }
71 struct mac80211_hwsim_data {
73 struct ieee80211_hw_mode modes[1];
74 struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
75 struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
79 enum ieee80211_phymode phymode;
82 unsigned int rx_filter;
87 struct hwsim_radiotap_hdr {
88 struct ieee80211_radiotap_header hdr;
93 } __attribute__ ((packed));
96 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
98 /* TODO: allow packet injection */
104 static void mac80211_hwsim_monitor_rx(struct mac80211_hwsim_data *data,
105 struct sk_buff *tx_skb,
106 struct ieee80211_tx_control *control)
109 struct hwsim_radiotap_hdr *hdr;
112 if (!netif_running(hwsim_mon))
115 skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
119 hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
120 hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
122 hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
123 hdr->hdr.it_present = __constant_cpu_to_le32(
124 (1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL));
128 hdr->rt_rate = control->tx_rate / 5;
129 hdr->rt_channel = data->freq;
130 flags = IEEE80211_CHAN_2GHZ;
131 if (control->rate->flags & IEEE80211_RATE_OFDM)
132 flags |= IEEE80211_CHAN_OFDM;
133 if (control->rate->flags & IEEE80211_RATE_CCK)
134 flags |= IEEE80211_CHAN_CCK;
135 hdr->rt_chbitmask = cpu_to_le16(flags);
137 skb->dev = hwsim_mon;
138 skb_set_mac_header(skb, 0);
139 skb->ip_summed = CHECKSUM_UNNECESSARY;
140 skb->pkt_type = PACKET_OTHERHOST;
141 skb->protocol = __constant_htons(ETH_P_802_2);
142 memset(skb->cb, 0, sizeof(skb->cb));
147 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
148 struct ieee80211_tx_control *control)
150 struct mac80211_hwsim_data *data = hw->priv;
151 struct ieee80211_tx_status tx_status;
152 struct ieee80211_rx_status rx_status;
155 mac80211_hwsim_monitor_rx(data, skb, control);
157 if (!data->radio_enabled) {
158 printk(KERN_DEBUG "%s: dropped TX frame since radio "
159 "disabled\n", wiphy_name(hw->wiphy));
164 memset(&rx_status, 0, sizeof(rx_status));
165 /* TODO: set mactime */
166 rx_status.freq = data->freq;
167 rx_status.channel = data->channel;
168 rx_status.phymode = data->phymode;
169 rx_status.rate = control->tx_rate;
170 /* TODO: simulate signal strength (and optional packet drop) */
172 /* Copy skb to all enabled radios that are on the current frequency */
173 for (i = 0; i < hwsim_radio_count; i++) {
174 struct mac80211_hwsim_data *data2;
175 struct sk_buff *nskb;
177 if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
179 data2 = hwsim_radios[i]->priv;
180 if (!data2->started || !data2->radio_enabled ||
181 data->freq != data2->freq)
184 nskb = skb_copy(skb, GFP_ATOMIC);
188 ieee80211_rx(hwsim_radios[i], nskb, &rx_status);
191 memset(&tx_status, 0, sizeof(tx_status));
192 memcpy(&tx_status.control, control, sizeof(*control));
193 /* TODO: proper ACK determination */
194 tx_status.flags = IEEE80211_TX_STATUS_ACK;
195 ieee80211_tx_status(hw, skb, &tx_status);
200 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
202 struct mac80211_hwsim_data *data = hw->priv;
203 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
209 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
211 struct mac80211_hwsim_data *data = hw->priv;
213 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
217 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
218 struct ieee80211_if_init_conf *conf)
220 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
225 static void mac80211_hwsim_remove_interface(
226 struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
228 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
232 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
233 struct ieee80211_conf *conf)
235 struct mac80211_hwsim_data *data = hw->priv;
237 printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
238 wiphy_name(hw->wiphy), __func__,
239 conf->freq, conf->radio_enabled, conf->beacon_int);
241 data->freq = conf->freq;
242 data->channel = conf->channel;
243 data->phymode = conf->phymode;
244 data->radio_enabled = conf->radio_enabled;
245 data->beacon_int = conf->beacon_int;
251 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
252 unsigned int changed_flags,
253 unsigned int *total_flags,
255 struct dev_addr_list *mc_list)
257 struct mac80211_hwsim_data *data = hw->priv;
259 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
262 if (*total_flags & FIF_PROMISC_IN_BSS)
263 data->rx_filter |= FIF_PROMISC_IN_BSS;
264 if (*total_flags & FIF_ALLMULTI)
265 data->rx_filter |= FIF_ALLMULTI;
267 *total_flags = data->rx_filter;
272 static const struct ieee80211_ops mac80211_hwsim_ops =
274 .tx = mac80211_hwsim_tx,
275 .start = mac80211_hwsim_start,
276 .stop = mac80211_hwsim_stop,
277 .add_interface = mac80211_hwsim_add_interface,
278 .remove_interface = mac80211_hwsim_remove_interface,
279 .config = mac80211_hwsim_config,
280 .configure_filter = mac80211_hwsim_configure_filter,
284 static void mac80211_hwsim_free(void)
288 for (i = 0; i < hwsim_radio_count; i++) {
289 if (hwsim_radios[i]) {
290 struct mac80211_hwsim_data *data;
291 data = hwsim_radios[i]->priv;
292 ieee80211_unregister_hw(hwsim_radios[i]);
293 if (!IS_ERR(data->dev))
294 device_unregister(data->dev);
295 ieee80211_free_hw(hwsim_radios[i]);
299 class_destroy(hwsim_class);
303 static struct device_driver mac80211_hwsim_driver = {
304 .name = "mac80211_hwsim"
308 static void hwsim_mon_setup(struct net_device *dev)
310 dev->hard_start_xmit = hwsim_mon_xmit;
311 dev->destructor = free_netdev;
313 dev->tx_queue_len = 0;
314 dev->type = ARPHRD_IEEE80211_RADIOTAP;
315 memset(dev->dev_addr, 0, ETH_ALEN);
316 dev->dev_addr[0] = 0x12;
320 static int __init init_mac80211_hwsim(void)
324 struct mac80211_hwsim_data *data;
325 struct ieee80211_hw *hw;
326 DECLARE_MAC_BUF(mac);
328 if (radios < 1 || radios > 65535)
331 hwsim_radio_count = radios;
332 hwsim_radios = kcalloc(hwsim_radio_count,
333 sizeof(struct ieee80211_hw *), GFP_KERNEL);
334 if (hwsim_radios == NULL)
337 hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
338 if (IS_ERR(hwsim_class)) {
340 return PTR_ERR(hwsim_class);
343 memset(addr, 0, ETH_ALEN);
346 for (i = 0; i < hwsim_radio_count; i++) {
347 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
349 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
351 printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
356 hwsim_radios[i] = hw;
359 data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
360 if (IS_ERR(data->dev)) {
361 printk(KERN_DEBUG "mac80211_hwsim: device_create "
362 "failed (%ld)\n", PTR_ERR(data->dev));
366 data->dev->driver = &mac80211_hwsim_driver;
367 dev_set_drvdata(data->dev, hw);
369 SET_IEEE80211_DEV(hw, data->dev);
372 SET_IEEE80211_PERM_ADDR(hw, addr);
374 hw->channel_change_time = 1;
377 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
378 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
379 data->modes[0].channels = data->channels;
380 data->modes[0].rates = data->rates;
381 data->modes[0].mode = MODE_IEEE80211G;
382 data->modes[0].num_channels = ARRAY_SIZE(hwsim_channels);
383 data->modes[0].num_rates = ARRAY_SIZE(hwsim_rates);
385 err = ieee80211_register_hwmode(hw, data->modes);
387 printk(KERN_DEBUG "mac80211_hwsim: "
388 "ieee80211_register_hwmode failed (%d)\n", err);
392 err = ieee80211_register_hw(hw);
394 printk(KERN_DEBUG "mac80211_hwsim: "
395 "ieee80211_register_hw failed (%d)\n", err);
399 printk(KERN_DEBUG "%s: hwaddr %s registered\n",
400 wiphy_name(hw->wiphy),
401 print_mac(mac, hw->wiphy->perm_addr));
404 hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
405 if (hwsim_mon == NULL)
410 err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
415 err = register_netdevice(hwsim_mon);
425 free_netdev(hwsim_mon);
428 mac80211_hwsim_free();
433 static void __exit exit_mac80211_hwsim(void)
435 printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
438 unregister_netdev(hwsim_mon);
439 mac80211_hwsim_free();
443 module_init(init_mac80211_hwsim);
444 module_exit(exit_mac80211_hwsim);