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[linux-2.6-omap-h63xx.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         DECLARE_MAC_BUF(mac);
305         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
306                wiphy_name(hw->wiphy), __func__, conf->type,
307                print_mac(mac, conf->mac_addr));
308         hwsim_set_magic(conf->vif);
309         return 0;
310 }
311
312
313 static void mac80211_hwsim_remove_interface(
314         struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
315 {
316         DECLARE_MAC_BUF(mac);
317         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
318                wiphy_name(hw->wiphy), __func__, conf->type,
319                print_mac(mac, conf->mac_addr));
320         hwsim_check_magic(conf->vif);
321         hwsim_clear_magic(conf->vif);
322 }
323
324
325 static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
326                                      struct ieee80211_vif *vif)
327 {
328         struct ieee80211_hw *hw = arg;
329         struct sk_buff *skb;
330         struct ieee80211_tx_info *info;
331
332         hwsim_check_magic(vif);
333
334         if (vif->type != NL80211_IFTYPE_AP)
335                 return;
336
337         skb = ieee80211_beacon_get(hw, vif);
338         if (skb == NULL)
339                 return;
340         info = IEEE80211_SKB_CB(skb);
341
342         mac80211_hwsim_monitor_rx(hw, skb);
343         mac80211_hwsim_tx_frame(hw, skb);
344         dev_kfree_skb(skb);
345 }
346
347
348 static void mac80211_hwsim_beacon(unsigned long arg)
349 {
350         struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
351         struct mac80211_hwsim_data *data = hw->priv;
352
353         if (!data->started || !data->radio_enabled)
354                 return;
355
356         ieee80211_iterate_active_interfaces_atomic(
357                 hw, mac80211_hwsim_beacon_tx, hw);
358
359         data->beacon_timer.expires = jiffies + data->beacon_int;
360         add_timer(&data->beacon_timer);
361 }
362
363
364 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
365                                  struct ieee80211_conf *conf)
366 {
367         struct mac80211_hwsim_data *data = hw->priv;
368
369         printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
370                wiphy_name(hw->wiphy), __func__,
371                conf->channel->center_freq, conf->radio_enabled,
372                conf->beacon_int);
373
374         data->channel = conf->channel;
375         data->radio_enabled = conf->radio_enabled;
376         data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
377         if (data->beacon_int < 1)
378                 data->beacon_int = 1;
379
380         if (!data->started || !data->radio_enabled)
381                 del_timer(&data->beacon_timer);
382         else
383                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
384
385         return 0;
386 }
387
388
389 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
390                                             unsigned int changed_flags,
391                                             unsigned int *total_flags,
392                                             int mc_count,
393                                             struct dev_addr_list *mc_list)
394 {
395         struct mac80211_hwsim_data *data = hw->priv;
396
397         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
398
399         data->rx_filter = 0;
400         if (*total_flags & FIF_PROMISC_IN_BSS)
401                 data->rx_filter |= FIF_PROMISC_IN_BSS;
402         if (*total_flags & FIF_ALLMULTI)
403                 data->rx_filter |= FIF_ALLMULTI;
404
405         *total_flags = data->rx_filter;
406 }
407
408 static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
409                                            struct ieee80211_vif *vif,
410                                            struct ieee80211_if_conf *conf)
411 {
412         hwsim_check_magic(vif);
413         return 0;
414 }
415
416 static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
417                                             struct ieee80211_vif *vif,
418                                             struct ieee80211_bss_conf *info,
419                                             u32 changed)
420 {
421         hwsim_check_magic(vif);
422 }
423
424 static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
425                                       struct ieee80211_vif *vif,
426                                       enum sta_notify_cmd cmd,
427                                       struct ieee80211_sta *sta)
428 {
429         hwsim_check_magic(vif);
430         switch (cmd) {
431         case STA_NOTIFY_ADD:
432                 hwsim_set_sta_magic(sta);
433                 break;
434         case STA_NOTIFY_REMOVE:
435                 hwsim_clear_sta_magic(sta);
436                 break;
437         }
438 }
439
440 static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
441                                   struct ieee80211_sta *sta,
442                                   bool set)
443 {
444         hwsim_check_sta_magic(sta);
445         return 0;
446 }
447
448 static const struct ieee80211_ops mac80211_hwsim_ops =
449 {
450         .tx = mac80211_hwsim_tx,
451         .start = mac80211_hwsim_start,
452         .stop = mac80211_hwsim_stop,
453         .add_interface = mac80211_hwsim_add_interface,
454         .remove_interface = mac80211_hwsim_remove_interface,
455         .config = mac80211_hwsim_config,
456         .configure_filter = mac80211_hwsim_configure_filter,
457         .config_interface = mac80211_hwsim_config_interface,
458         .bss_info_changed = mac80211_hwsim_bss_info_changed,
459         .sta_notify = mac80211_hwsim_sta_notify,
460         .set_tim = mac80211_hwsim_set_tim,
461 };
462
463
464 static void mac80211_hwsim_free(void)
465 {
466         struct list_head tmplist, *i, *tmp;
467         struct mac80211_hwsim_data *data;
468
469         INIT_LIST_HEAD(&tmplist);
470
471         spin_lock_bh(&hwsim_radio_lock);
472         list_for_each_safe(i, tmp, &hwsim_radios)
473                 list_move(i, &tmplist);
474         spin_unlock_bh(&hwsim_radio_lock);
475
476         list_for_each_entry(data, &tmplist, list) {
477                 ieee80211_unregister_hw(data->hw);
478                 device_unregister(data->dev);
479                 ieee80211_free_hw(data->hw);
480         }
481         class_destroy(hwsim_class);
482 }
483
484
485 static struct device_driver mac80211_hwsim_driver = {
486         .name = "mac80211_hwsim"
487 };
488
489
490 static void hwsim_mon_setup(struct net_device *dev)
491 {
492         dev->hard_start_xmit = hwsim_mon_xmit;
493         dev->destructor = free_netdev;
494         ether_setup(dev);
495         dev->tx_queue_len = 0;
496         dev->type = ARPHRD_IEEE80211_RADIOTAP;
497         memset(dev->dev_addr, 0, ETH_ALEN);
498         dev->dev_addr[0] = 0x12;
499 }
500
501
502 static int __init init_mac80211_hwsim(void)
503 {
504         int i, err = 0;
505         u8 addr[ETH_ALEN];
506         struct mac80211_hwsim_data *data;
507         struct ieee80211_hw *hw;
508         DECLARE_MAC_BUF(mac);
509
510         if (radios < 1 || radios > 100)
511                 return -EINVAL;
512
513         spin_lock_init(&hwsim_radio_lock);
514         INIT_LIST_HEAD(&hwsim_radios);
515
516         hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
517         if (IS_ERR(hwsim_class))
518                 return PTR_ERR(hwsim_class);
519
520         memset(addr, 0, ETH_ALEN);
521         addr[0] = 0x02;
522
523         for (i = 0; i < radios; i++) {
524                 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
525                        i);
526                 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
527                 if (!hw) {
528                         printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
529                                "failed\n");
530                         err = -ENOMEM;
531                         goto failed;
532                 }
533                 data = hw->priv;
534                 data->hw = hw;
535
536                 data->dev = device_create(hwsim_class, NULL, 0, hw,
537                                           "hwsim%d", i);
538                 if (IS_ERR(data->dev)) {
539                         printk(KERN_DEBUG
540                                "mac80211_hwsim: device_create "
541                                "failed (%ld)\n", PTR_ERR(data->dev));
542                         err = -ENOMEM;
543                         goto failed_drvdata;
544                 }
545                 data->dev->driver = &mac80211_hwsim_driver;
546
547                 SET_IEEE80211_DEV(hw, data->dev);
548                 addr[3] = i >> 8;
549                 addr[4] = i;
550                 SET_IEEE80211_PERM_ADDR(hw, addr);
551
552                 hw->channel_change_time = 1;
553                 hw->queues = 4;
554                 hw->wiphy->interface_modes =
555                         BIT(NL80211_IFTYPE_STATION) |
556                         BIT(NL80211_IFTYPE_AP);
557                 hw->ampdu_queues = 1;
558
559                 /* ask mac80211 to reserve space for magic */
560                 hw->vif_data_size = sizeof(struct hwsim_vif_priv);
561                 hw->sta_data_size = sizeof(struct hwsim_sta_priv);
562
563                 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
564                 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
565                 data->band.channels = data->channels;
566                 data->band.n_channels = ARRAY_SIZE(hwsim_channels);
567                 data->band.bitrates = data->rates;
568                 data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
569                 data->band.ht_info.ht_supported = 1;
570                 data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH |
571                         IEEE80211_HT_CAP_GRN_FLD |
572                         IEEE80211_HT_CAP_SGI_40 |
573                         IEEE80211_HT_CAP_DSSSCCK40;
574                 data->band.ht_info.ampdu_factor = 0x3;
575                 data->band.ht_info.ampdu_density = 0x6;
576                 memset(data->band.ht_info.supp_mcs_set, 0,
577                        sizeof(data->band.ht_info.supp_mcs_set));
578                 data->band.ht_info.supp_mcs_set[0] = 0xff;
579                 data->band.ht_info.supp_mcs_set[1] = 0xff;
580                 data->band.ht_info.supp_mcs_set[12] =
581                         IEEE80211_HT_CAP_MCS_TX_DEFINED;
582                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
583
584                 err = ieee80211_register_hw(hw);
585                 if (err < 0) {
586                         printk(KERN_DEBUG "mac80211_hwsim: "
587                                "ieee80211_register_hw failed (%d)\n", err);
588                         goto failed_hw;
589                 }
590
591                 printk(KERN_DEBUG "%s: hwaddr %s registered\n",
592                        wiphy_name(hw->wiphy),
593                        print_mac(mac, hw->wiphy->perm_addr));
594
595                 setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
596                             (unsigned long) hw);
597
598                 list_add_tail(&data->list, &hwsim_radios);
599         }
600
601         hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
602         if (hwsim_mon == NULL)
603                 goto failed;
604
605         rtnl_lock();
606
607         err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
608         if (err < 0)
609                 goto failed_mon;
610
611
612         err = register_netdevice(hwsim_mon);
613         if (err < 0)
614                 goto failed_mon;
615
616         rtnl_unlock();
617
618         return 0;
619
620 failed_mon:
621         rtnl_unlock();
622         free_netdev(hwsim_mon);
623         mac80211_hwsim_free();
624         return err;
625
626 failed_hw:
627         device_unregister(data->dev);
628 failed_drvdata:
629         ieee80211_free_hw(hw);
630 failed:
631         mac80211_hwsim_free();
632         return err;
633 }
634
635
636 static void __exit exit_mac80211_hwsim(void)
637 {
638         printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");
639
640         unregister_netdev(hwsim_mon);
641         mac80211_hwsim_free();
642 }
643
644
645 module_init(init_mac80211_hwsim);
646 module_exit(exit_mac80211_hwsim);