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;
86 struct hwsim_radiotap_hdr {
87 struct ieee80211_radiotap_header hdr;
92 } __attribute__ ((packed));
95 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
97 /* TODO: allow packet injection */
103 static void mac80211_hwsim_monitor_rx(struct mac80211_hwsim_data *data,
104 struct sk_buff *tx_skb,
105 struct ieee80211_tx_control *control)
108 struct hwsim_radiotap_hdr *hdr;
111 if (!netif_running(hwsim_mon))
114 skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
118 hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
119 hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
121 hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
122 hdr->hdr.it_present = __constant_cpu_to_le32(
123 (1 << IEEE80211_RADIOTAP_FLAGS) |
124 (1 << IEEE80211_RADIOTAP_RATE) |
125 (1 << IEEE80211_RADIOTAP_CHANNEL));
127 hdr->rt_rate = control->tx_rate / 5;
128 hdr->rt_channel = data->freq;
129 flags = IEEE80211_CHAN_2GHZ;
130 if (control->rate->flags & IEEE80211_RATE_OFDM)
131 flags |= IEEE80211_CHAN_OFDM;
132 if (control->rate->flags & IEEE80211_RATE_CCK)
133 flags |= IEEE80211_CHAN_CCK;
134 hdr->rt_chbitmask = cpu_to_le16(flags);
136 skb->dev = hwsim_mon;
137 skb_set_mac_header(skb, 0);
138 skb->ip_summed = CHECKSUM_UNNECESSARY;
139 skb->pkt_type = PACKET_OTHERHOST;
140 skb->protocol = __constant_htons(ETH_P_802_2);
141 memset(skb->cb, 0, sizeof(skb->cb));
146 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
147 struct ieee80211_tx_control *control)
149 struct mac80211_hwsim_data *data = hw->priv;
150 struct ieee80211_tx_status tx_status;
151 struct ieee80211_rx_status rx_status;
154 mac80211_hwsim_monitor_rx(data, skb, control);
156 if (!data->radio_enabled) {
157 printk(KERN_DEBUG "%s: dropped TX frame since radio "
158 "disabled\n", wiphy_name(hw->wiphy));
163 memset(&rx_status, 0, sizeof(rx_status));
164 /* TODO: set mactime */
165 rx_status.freq = data->freq;
166 rx_status.channel = data->channel;
167 rx_status.phymode = data->phymode;
168 rx_status.rate = control->tx_rate;
169 /* TODO: simulate signal strength (and optional packet drop) */
171 /* Copy skb to all enabled radios that are on the current frequency */
172 for (i = 0; i < hwsim_radio_count; i++) {
173 struct mac80211_hwsim_data *data2;
174 struct sk_buff *nskb;
176 if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
178 data2 = hwsim_radios[i]->priv;
179 if (!data2->radio_enabled || data->freq != data2->freq)
182 nskb = skb_copy(skb, GFP_ATOMIC);
186 ieee80211_rx(hwsim_radios[i], nskb, &rx_status);
189 memset(&tx_status, 0, sizeof(tx_status));
190 memcpy(&tx_status.control, control, sizeof(*control));
191 /* TODO: proper ACK determination */
192 tx_status.flags = IEEE80211_TX_STATUS_ACK;
193 ieee80211_tx_status(hw, skb, &tx_status);
198 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
200 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
205 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
207 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
211 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
212 struct ieee80211_if_init_conf *conf)
214 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
219 static void mac80211_hwsim_remove_interface(
220 struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
222 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
226 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
227 struct ieee80211_conf *conf)
229 struct mac80211_hwsim_data *data = hw->priv;
231 printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
232 wiphy_name(hw->wiphy), __func__,
233 conf->freq, conf->radio_enabled, conf->beacon_int);
235 data->freq = conf->freq;
236 data->channel = conf->channel;
237 data->phymode = conf->phymode;
238 data->radio_enabled = conf->radio_enabled;
239 data->beacon_int = conf->beacon_int;
245 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
246 unsigned int changed_flags,
247 unsigned int *total_flags,
249 struct dev_addr_list *mc_list)
251 struct mac80211_hwsim_data *data = hw->priv;
253 printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
256 if (*total_flags & FIF_PROMISC_IN_BSS)
257 data->rx_filter |= FIF_PROMISC_IN_BSS;
258 if (*total_flags & FIF_ALLMULTI)
259 data->rx_filter |= FIF_ALLMULTI;
261 *total_flags = data->rx_filter;
266 static const struct ieee80211_ops mac80211_hwsim_ops =
268 .tx = mac80211_hwsim_tx,
269 .start = mac80211_hwsim_start,
270 .stop = mac80211_hwsim_stop,
271 .add_interface = mac80211_hwsim_add_interface,
272 .remove_interface = mac80211_hwsim_remove_interface,
273 .config = mac80211_hwsim_config,
274 .configure_filter = mac80211_hwsim_configure_filter,
278 static void mac80211_hwsim_free(void)
282 for (i = 0; i < hwsim_radio_count; i++) {
283 if (hwsim_radios[i]) {
284 struct mac80211_hwsim_data *data;
285 data = hwsim_radios[i]->priv;
286 ieee80211_unregister_hw(hwsim_radios[i]);
287 if (!IS_ERR(data->dev))
288 device_unregister(data->dev);
289 ieee80211_free_hw(hwsim_radios[i]);
293 class_destroy(hwsim_class);
297 static struct device_driver mac80211_hwsim_driver = {
298 .name = "mac80211_hwsim"
302 static void hwsim_mon_setup(struct net_device *dev)
304 dev->hard_start_xmit = hwsim_mon_xmit;
305 dev->destructor = free_netdev;
307 dev->tx_queue_len = 0;
308 dev->type = ARPHRD_IEEE80211_RADIOTAP;
309 memset(dev->dev_addr, 0, ETH_ALEN);
310 dev->dev_addr[0] = 0x12;
314 static int __init init_mac80211_hwsim(void)
318 struct mac80211_hwsim_data *data;
319 struct ieee80211_hw *hw;
320 DECLARE_MAC_BUF(mac);
322 if (radios < 1 || radios > 65535)
325 hwsim_radio_count = radios;
326 hwsim_radios = kcalloc(hwsim_radio_count,
327 sizeof(struct ieee80211_hw *), GFP_KERNEL);
328 if (hwsim_radios == NULL)
331 hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
332 if (IS_ERR(hwsim_class)) {
334 return PTR_ERR(hwsim_class);
337 memset(addr, 0, ETH_ALEN);
340 for (i = 0; i < hwsim_radio_count; i++) {
341 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
343 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
345 printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
350 hwsim_radios[i] = hw;
353 data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
354 if (IS_ERR(data->dev)) {
355 printk(KERN_DEBUG "mac80211_hwsim: device_create "
356 "failed (%ld)\n", PTR_ERR(data->dev));
360 data->dev->driver = &mac80211_hwsim_driver;
361 dev_set_drvdata(data->dev, hw);
363 SET_IEEE80211_DEV(hw, data->dev);
366 SET_IEEE80211_PERM_ADDR(hw, addr);
368 hw->channel_change_time = 1;
371 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
372 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
373 data->modes[0].channels = data->channels;
374 data->modes[0].rates = data->rates;
375 data->modes[0].mode = MODE_IEEE80211G;
376 data->modes[0].num_channels = ARRAY_SIZE(hwsim_channels);
377 data->modes[0].num_rates = ARRAY_SIZE(hwsim_rates);
379 err = ieee80211_register_hwmode(hw, data->modes);
381 printk(KERN_DEBUG "mac80211_hwsim: "
382 "ieee80211_register_hwmode failed (%d)\n", err);
386 err = ieee80211_register_hw(hw);
388 printk(KERN_DEBUG "mac80211_hwsim: "
389 "ieee80211_register_hw failed (%d)\n", err);
393 printk(KERN_DEBUG "%s: hwaddr %s registered\n",
394 wiphy_name(hw->wiphy),
395 print_mac(mac, hw->wiphy->perm_addr));
398 hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
399 if (hwsim_mon == NULL)
404 err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
409 err = register_netdevice(hwsim_mon);
419 free_netdev(hwsim_mon);
422 mac80211_hwsim_free();
427 static void __exit exit_mac80211_hwsim(void)
429 printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
432 unregister_netdev(hwsim_mon);
433 mac80211_hwsim_free();
437 module_init(init_mac80211_hwsim);
438 module_exit(exit_mac80211_hwsim);