net: convert print_mac to %pM
[linux-2.6.git] / drivers / net / wireless / mac80211_hwsim.c
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 <linux/list.h>
18 #include <linux/spinlock.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include <linux/if_arp.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/etherdevice.h>
24
25 MODULE_AUTHOR("Jouni Malinen");
26 MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
27 MODULE_LICENSE("GPL");
28
29 static int radios = 2;
30 module_param(radios, int, 0444);
31 MODULE_PARM_DESC(radios, "Number of simulated radios");
32
33 struct hwsim_vif_priv {
34         u32 magic;
35 };
36
37 #define HWSIM_VIF_MAGIC 0x69537748
38
39 static inline void hwsim_check_magic(struct ieee80211_vif *vif)
40 {
41         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
42         WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
43 }
44
45 static inline void hwsim_set_magic(struct ieee80211_vif *vif)
46 {
47         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
48         vp->magic = HWSIM_VIF_MAGIC;
49 }
50
51 static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
52 {
53         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
54         vp->magic = 0;
55 }
56
57 struct hwsim_sta_priv {
58         u32 magic;
59 };
60
61 #define HWSIM_STA_MAGIC 0x6d537748
62
63 static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
64 {
65         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
66         WARN_ON(sp->magic != HWSIM_VIF_MAGIC);
67 }
68
69 static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
70 {
71         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
72         sp->magic = HWSIM_VIF_MAGIC;
73 }
74
75 static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
76 {
77         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
78         sp->magic = 0;
79 }
80
81 static struct class *hwsim_class;
82
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 static spinlock_t hwsim_radio_lock;
119 static struct list_head hwsim_radios;
120
121 struct mac80211_hwsim_data {
122         struct list_head list;
123         struct ieee80211_hw *hw;
124         struct device *dev;
125         struct ieee80211_supported_band band;
126         struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
127         struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
128
129         struct ieee80211_channel *channel;
130         int radio_enabled;
131         unsigned long beacon_int; /* in jiffies unit */
132         unsigned int rx_filter;
133         int started;
134         struct timer_list beacon_timer;
135 };
136
137
138 struct hwsim_radiotap_hdr {
139         struct ieee80211_radiotap_header hdr;
140         u8 rt_flags;
141         u8 rt_rate;
142         __le16 rt_channel;
143         __le16 rt_chbitmask;
144 } __attribute__ ((packed));
145
146
147 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
148 {
149         /* TODO: allow packet injection */
150         dev_kfree_skb(skb);
151         return 0;
152 }
153
154
155 static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
156                                       struct sk_buff *tx_skb)
157 {
158         struct mac80211_hwsim_data *data = hw->priv;
159         struct sk_buff *skb;
160         struct hwsim_radiotap_hdr *hdr;
161         u16 flags;
162         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
163         struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
164
165         if (!netif_running(hwsim_mon))
166                 return;
167
168         skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
169         if (skb == NULL)
170                 return;
171
172         hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
173         hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
174         hdr->hdr.it_pad = 0;
175         hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
176         hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
177                                           (1 << IEEE80211_RADIOTAP_RATE) |
178                                           (1 << IEEE80211_RADIOTAP_CHANNEL));
179         hdr->rt_flags = 0;
180         hdr->rt_rate = txrate->bitrate / 5;
181         hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
182         flags = IEEE80211_CHAN_2GHZ;
183         if (txrate->flags & IEEE80211_RATE_ERP_G)
184                 flags |= IEEE80211_CHAN_OFDM;
185         else
186                 flags |= IEEE80211_CHAN_CCK;
187         hdr->rt_chbitmask = cpu_to_le16(flags);
188
189         skb->dev = hwsim_mon;
190         skb_set_mac_header(skb, 0);
191         skb->ip_summed = CHECKSUM_UNNECESSARY;
192         skb->pkt_type = PACKET_OTHERHOST;
193         skb->protocol = htons(ETH_P_802_2);
194         memset(skb->cb, 0, sizeof(skb->cb));
195         netif_rx(skb);
196 }
197
198
199 static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
200                                     struct sk_buff *skb)
201 {
202         struct mac80211_hwsim_data *data = hw->priv, *data2;
203         bool ack = false;
204         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
205         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
206         struct ieee80211_rx_status rx_status;
207
208         memset(&rx_status, 0, sizeof(rx_status));
209         /* TODO: set mactime */
210         rx_status.freq = data->channel->center_freq;
211         rx_status.band = data->channel->band;
212         rx_status.rate_idx = info->tx_rate_idx;
213         /* TODO: simulate signal strength (and optional packet drop) */
214
215         /* Copy skb to all enabled radios that are on the current frequency */
216         spin_lock(&hwsim_radio_lock);
217         list_for_each_entry(data2, &hwsim_radios, list) {
218                 struct sk_buff *nskb;
219
220                 if (data == data2)
221                         continue;
222
223                 if (!data2->started || !data2->radio_enabled ||
224                     data->channel->center_freq != data2->channel->center_freq)
225                         continue;
226
227                 nskb = skb_copy(skb, GFP_ATOMIC);
228                 if (nskb == NULL)
229                         continue;
230
231                 if (memcmp(hdr->addr1, data2->hw->wiphy->perm_addr,
232                            ETH_ALEN) == 0)
233                         ack = true;
234                 ieee80211_rx_irqsafe(data2->hw, nskb, &rx_status);
235         }
236         spin_unlock(&hwsim_radio_lock);
237
238         return ack;
239 }
240
241
242 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
243 {
244         struct mac80211_hwsim_data *data = hw->priv;
245         bool ack;
246         struct ieee80211_tx_info *txi;
247
248         mac80211_hwsim_monitor_rx(hw, skb);
249
250         if (skb->len < 10) {
251                 /* Should not happen; just a sanity check for addr1 use */
252                 dev_kfree_skb(skb);
253                 return NETDEV_TX_OK;
254         }
255
256         if (!data->radio_enabled) {
257                 printk(KERN_DEBUG "%s: dropped TX frame since radio "
258                        "disabled\n", wiphy_name(hw->wiphy));
259                 dev_kfree_skb(skb);
260                 return NETDEV_TX_OK;
261         }
262
263         ack = mac80211_hwsim_tx_frame(hw, skb);
264
265         txi = IEEE80211_SKB_CB(skb);
266
267         if (txi->control.vif)
268                 hwsim_check_magic(txi->control.vif);
269         if (txi->control.sta)
270                 hwsim_check_sta_magic(txi->control.sta);
271
272         memset(&txi->status, 0, sizeof(txi->status));
273         if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
274                 if (ack)
275                         txi->flags |= IEEE80211_TX_STAT_ACK;
276                 else
277                         txi->status.excessive_retries = 1;
278         }
279         ieee80211_tx_status_irqsafe(hw, skb);
280         return NETDEV_TX_OK;
281 }
282
283
284 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
285 {
286         struct mac80211_hwsim_data *data = hw->priv;
287         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
288         data->started = 1;
289         return 0;
290 }
291
292
293 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
294 {
295         struct mac80211_hwsim_data *data = hw->priv;
296         data->started = 0;
297         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
298 }
299
300
301 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
302                                         struct ieee80211_if_init_conf *conf)
303 {
304         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
305                wiphy_name(hw->wiphy), __func__, conf->type,
306                conf->mac_addr);
307         hwsim_set_magic(conf->vif);
308         return 0;
309 }
310
311
312 static void mac80211_hwsim_remove_interface(
313         struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
314 {
315         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
316                wiphy_name(hw->wiphy), __func__, conf->type,
317                conf->mac_addr);
318         hwsim_check_magic(conf->vif);
319         hwsim_clear_magic(conf->vif);
320 }
321
322
323 static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
324                                      struct ieee80211_vif *vif)
325 {
326         struct ieee80211_hw *hw = arg;
327         struct sk_buff *skb;
328         struct ieee80211_tx_info *info;
329
330         hwsim_check_magic(vif);
331
332         if (vif->type != NL80211_IFTYPE_AP)
333                 return;
334
335         skb = ieee80211_beacon_get(hw, vif);
336         if (skb == NULL)
337                 return;
338         info = IEEE80211_SKB_CB(skb);
339
340         mac80211_hwsim_monitor_rx(hw, skb);
341         mac80211_hwsim_tx_frame(hw, skb);
342         dev_kfree_skb(skb);
343 }
344
345
346 static void mac80211_hwsim_beacon(unsigned long arg)
347 {
348         struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
349         struct mac80211_hwsim_data *data = hw->priv;
350
351         if (!data->started || !data->radio_enabled)
352                 return;
353
354         ieee80211_iterate_active_interfaces_atomic(
355                 hw, mac80211_hwsim_beacon_tx, hw);
356
357         data->beacon_timer.expires = jiffies + data->beacon_int;
358         add_timer(&data->beacon_timer);
359 }
360
361
362 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
363                                  struct ieee80211_conf *conf)
364 {
365         struct mac80211_hwsim_data *data = hw->priv;
366
367         printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
368                wiphy_name(hw->wiphy), __func__,
369                conf->channel->center_freq, conf->radio_enabled,
370                conf->beacon_int);
371
372         data->channel = conf->channel;
373         data->radio_enabled = conf->radio_enabled;
374         data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
375         if (data->beacon_int < 1)
376                 data->beacon_int = 1;
377
378         if (!data->started || !data->radio_enabled)
379                 del_timer(&data->beacon_timer);
380         else
381                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
382
383         return 0;
384 }
385
386
387 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
388                                             unsigned int changed_flags,
389                                             unsigned int *total_flags,
390                                             int mc_count,
391                                             struct dev_addr_list *mc_list)
392 {
393         struct mac80211_hwsim_data *data = hw->priv;
394
395         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
396
397         data->rx_filter = 0;
398         if (*total_flags & FIF_PROMISC_IN_BSS)
399                 data->rx_filter |= FIF_PROMISC_IN_BSS;
400         if (*total_flags & FIF_ALLMULTI)
401                 data->rx_filter |= FIF_ALLMULTI;
402
403         *total_flags = data->rx_filter;
404 }
405
406 static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
407                                            struct ieee80211_vif *vif,
408                                            struct ieee80211_if_conf *conf)
409 {
410         hwsim_check_magic(vif);
411         return 0;
412 }
413
414 static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
415                                             struct ieee80211_vif *vif,
416                                             struct ieee80211_bss_conf *info,
417                                             u32 changed)
418 {
419         hwsim_check_magic(vif);
420 }
421
422 static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
423                                       struct ieee80211_vif *vif,
424                                       enum sta_notify_cmd cmd,
425                                       struct ieee80211_sta *sta)
426 {
427         hwsim_check_magic(vif);
428         switch (cmd) {
429         case STA_NOTIFY_ADD:
430                 hwsim_set_sta_magic(sta);
431                 break;
432         case STA_NOTIFY_REMOVE:
433                 hwsim_clear_sta_magic(sta);
434                 break;
435         }
436 }
437
438 static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
439                                   struct ieee80211_sta *sta,
440                                   bool set)
441 {
442         hwsim_check_sta_magic(sta);
443         return 0;
444 }
445
446 static const struct ieee80211_ops mac80211_hwsim_ops =
447 {
448         .tx = mac80211_hwsim_tx,
449         .start = mac80211_hwsim_start,
450         .stop = mac80211_hwsim_stop,
451         .add_interface = mac80211_hwsim_add_interface,
452         .remove_interface = mac80211_hwsim_remove_interface,
453         .config = mac80211_hwsim_config,
454         .configure_filter = mac80211_hwsim_configure_filter,
455         .config_interface = mac80211_hwsim_config_interface,
456         .bss_info_changed = mac80211_hwsim_bss_info_changed,
457         .sta_notify = mac80211_hwsim_sta_notify,
458         .set_tim = mac80211_hwsim_set_tim,
459 };
460
461
462 static void mac80211_hwsim_free(void)
463 {
464         struct list_head tmplist, *i, *tmp;
465         struct mac80211_hwsim_data *data;
466
467         INIT_LIST_HEAD(&tmplist);
468
469         spin_lock_bh(&hwsim_radio_lock);
470         list_for_each_safe(i, tmp, &hwsim_radios)
471                 list_move(i, &tmplist);
472         spin_unlock_bh(&hwsim_radio_lock);
473
474         list_for_each_entry(data, &tmplist, list) {
475                 ieee80211_unregister_hw(data->hw);
476                 device_unregister(data->dev);
477                 ieee80211_free_hw(data->hw);
478         }
479         class_destroy(hwsim_class);
480 }
481
482
483 static struct device_driver mac80211_hwsim_driver = {
484         .name = "mac80211_hwsim"
485 };
486
487
488 static void hwsim_mon_setup(struct net_device *dev)
489 {
490         dev->hard_start_xmit = hwsim_mon_xmit;
491         dev->destructor = free_netdev;
492         ether_setup(dev);
493         dev->tx_queue_len = 0;
494         dev->type = ARPHRD_IEEE80211_RADIOTAP;
495         memset(dev->dev_addr, 0, ETH_ALEN);
496         dev->dev_addr[0] = 0x12;
497 }
498
499
500 static int __init init_mac80211_hwsim(void)
501 {
502         int i, err = 0;
503         u8 addr[ETH_ALEN];
504         struct mac80211_hwsim_data *data;
505         struct ieee80211_hw *hw;
506
507         if (radios < 1 || radios > 100)
508                 return -EINVAL;
509
510         spin_lock_init(&hwsim_radio_lock);
511         INIT_LIST_HEAD(&hwsim_radios);
512
513         hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
514         if (IS_ERR(hwsim_class))
515                 return PTR_ERR(hwsim_class);
516
517         memset(addr, 0, ETH_ALEN);
518         addr[0] = 0x02;
519
520         for (i = 0; i < radios; i++) {
521                 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
522                        i);
523                 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
524                 if (!hw) {
525                         printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
526                                "failed\n");
527                         err = -ENOMEM;
528                         goto failed;
529                 }
530                 data = hw->priv;
531                 data->hw = hw;
532
533                 data->dev = device_create(hwsim_class, NULL, 0, hw,
534                                           "hwsim%d", i);
535                 if (IS_ERR(data->dev)) {
536                         printk(KERN_DEBUG
537                                "mac80211_hwsim: device_create "
538                                "failed (%ld)\n", PTR_ERR(data->dev));
539                         err = -ENOMEM;
540                         goto failed_drvdata;
541                 }
542                 data->dev->driver = &mac80211_hwsim_driver;
543
544                 SET_IEEE80211_DEV(hw, data->dev);
545                 addr[3] = i >> 8;
546                 addr[4] = i;
547                 SET_IEEE80211_PERM_ADDR(hw, addr);
548
549                 hw->channel_change_time = 1;
550                 hw->queues = 4;
551                 hw->wiphy->interface_modes =
552                         BIT(NL80211_IFTYPE_STATION) |
553                         BIT(NL80211_IFTYPE_AP);
554                 hw->ampdu_queues = 1;
555
556                 /* ask mac80211 to reserve space for magic */
557                 hw->vif_data_size = sizeof(struct hwsim_vif_priv);
558                 hw->sta_data_size = sizeof(struct hwsim_sta_priv);
559
560                 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
561                 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
562                 data->band.channels = data->channels;
563                 data->band.n_channels = ARRAY_SIZE(hwsim_channels);
564                 data->band.bitrates = data->rates;
565                 data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
566                 data->band.ht_info.ht_supported = 1;
567                 data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH |
568                         IEEE80211_HT_CAP_GRN_FLD |
569                         IEEE80211_HT_CAP_SGI_40 |
570                         IEEE80211_HT_CAP_DSSSCCK40;
571                 data->band.ht_info.ampdu_factor = 0x3;
572                 data->band.ht_info.ampdu_density = 0x6;
573                 memset(data->band.ht_info.supp_mcs_set, 0,
574                        sizeof(data->band.ht_info.supp_mcs_set));
575                 data->band.ht_info.supp_mcs_set[0] = 0xff;
576                 data->band.ht_info.supp_mcs_set[1] = 0xff;
577                 data->band.ht_info.supp_mcs_set[12] =
578                         IEEE80211_HT_CAP_MCS_TX_DEFINED;
579                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
580
581                 err = ieee80211_register_hw(hw);
582                 if (err < 0) {
583                         printk(KERN_DEBUG "mac80211_hwsim: "
584                                "ieee80211_register_hw failed (%d)\n", err);
585                         goto failed_hw;
586                 }
587
588                 printk(KERN_DEBUG "%s: hwaddr %pM registered\n",
589                        wiphy_name(hw->wiphy),
590                        hw->wiphy->perm_addr);
591
592                 setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
593                             (unsigned long) hw);
594
595                 list_add_tail(&data->list, &hwsim_radios);
596         }
597
598         hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
599         if (hwsim_mon == NULL)
600                 goto failed;
601
602         rtnl_lock();
603
604         err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
605         if (err < 0)
606                 goto failed_mon;
607
608
609         err = register_netdevice(hwsim_mon);
610         if (err < 0)
611                 goto failed_mon;
612
613         rtnl_unlock();
614
615         return 0;
616
617 failed_mon:
618         rtnl_unlock();
619         free_netdev(hwsim_mon);
620         mac80211_hwsim_free();
621         return err;
622
623 failed_hw:
624         device_unregister(data->dev);
625 failed_drvdata:
626         ieee80211_free_hw(hw);
627 failed:
628         mac80211_hwsim_free();
629         return err;
630 }
631
632
633 static void __exit exit_mac80211_hwsim(void)
634 {
635         printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");
636
637         unregister_netdev(hwsim_mon);
638         mac80211_hwsim_free();
639 }
640
641
642 module_init(init_mac80211_hwsim);
643 module_exit(exit_mac80211_hwsim);