mac80211_hwsim: avoid NULL access
[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  * - RX filtering based on filter configuration (data->rx_filter)
14  */
15
16 #include <linux/list.h>
17 #include <linux/spinlock.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include <linux/if_arp.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/etherdevice.h>
23 #include <linux/debugfs.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 /**
34  * enum hwsim_regtest - the type of regulatory tests we offer
35  *
36  * These are the different values you can use for the regtest
37  * module parameter. This is useful to help test world roaming
38  * and the driver regulatory_hint() call and combinations of these.
39  * If you want to do specific alpha2 regulatory domain tests simply
40  * use the userspace regulatory request as that will be respected as
41  * well without the need of this module parameter. This is designed
42  * only for testing the driver regulatory request, world roaming
43  * and all possible combinations.
44  *
45  * @HWSIM_REGTEST_DISABLED: No regulatory tests are performed,
46  *      this is the default value.
47  * @HWSIM_REGTEST_DRIVER_REG_FOLLOW: Used for testing the driver regulatory
48  *      hint, only one driver regulatory hint will be sent as such the
49  *      secondary radios are expected to follow.
50  * @HWSIM_REGTEST_DRIVER_REG_ALL: Used for testing the driver regulatory
51  *      request with all radios reporting the same regulatory domain.
52  * @HWSIM_REGTEST_DIFF_COUNTRY: Used for testing the drivers calling
53  *      different regulatory domains requests. Expected behaviour is for
54  *      an intersection to occur but each device will still use their
55  *      respective regulatory requested domains. Subsequent radios will
56  *      use the resulting intersection.
57  * @HWSIM_REGTEST_WORLD_ROAM: Used for testing the world roaming. We acomplish
58  *      this by using a custom beacon-capable regulatory domain for the first
59  *      radio. All other device world roam.
60  * @HWSIM_REGTEST_CUSTOM_WORLD: Used for testing the custom world regulatory
61  *      domain requests. All radios will adhere to this custom world regulatory
62  *      domain.
63  * @HWSIM_REGTEST_CUSTOM_WORLD_2: Used for testing 2 custom world regulatory
64  *      domain requests. The first radio will adhere to the first custom world
65  *      regulatory domain, the second one to the second custom world regulatory
66  *      domain. All other devices will world roam.
67  * @HWSIM_REGTEST_STRICT_FOLLOW_: Used for testing strict regulatory domain
68  *      settings, only the first radio will send a regulatory domain request
69  *      and use strict settings. The rest of the radios are expected to follow.
70  * @HWSIM_REGTEST_STRICT_ALL: Used for testing strict regulatory domain
71  *      settings. All radios will adhere to this.
72  * @HWSIM_REGTEST_STRICT_AND_DRIVER_REG: Used for testing strict regulatory
73  *      domain settings, combined with secondary driver regulatory domain
74  *      settings. The first radio will get a strict regulatory domain setting
75  *      using the first driver regulatory request and the second radio will use
76  *      non-strict settings using the second driver regulatory request. All
77  *      other devices should follow the intersection created between the
78  *      first two.
79  * @HWSIM_REGTEST_ALL: Used for testing every possible mix. You will need
80  *      at least 6 radios for a complete test. We will test in this order:
81  *      1 - driver custom world regulatory domain
82  *      2 - second custom world regulatory domain
83  *      3 - first driver regulatory domain request
84  *      4 - second driver regulatory domain request
85  *      5 - strict regulatory domain settings using the third driver regulatory
86  *          domain request
87  *      6 and on - should follow the intersection of the 3rd, 4rth and 5th radio
88  *                 regulatory requests.
89  */
90 enum hwsim_regtest {
91         HWSIM_REGTEST_DISABLED = 0,
92         HWSIM_REGTEST_DRIVER_REG_FOLLOW = 1,
93         HWSIM_REGTEST_DRIVER_REG_ALL = 2,
94         HWSIM_REGTEST_DIFF_COUNTRY = 3,
95         HWSIM_REGTEST_WORLD_ROAM = 4,
96         HWSIM_REGTEST_CUSTOM_WORLD = 5,
97         HWSIM_REGTEST_CUSTOM_WORLD_2 = 6,
98         HWSIM_REGTEST_STRICT_FOLLOW = 7,
99         HWSIM_REGTEST_STRICT_ALL = 8,
100         HWSIM_REGTEST_STRICT_AND_DRIVER_REG = 9,
101         HWSIM_REGTEST_ALL = 10,
102 };
103
104 /* Set to one of the HWSIM_REGTEST_* values above */
105 static int regtest = HWSIM_REGTEST_DISABLED;
106 module_param(regtest, int, 0444);
107 MODULE_PARM_DESC(regtest, "The type of regulatory test we want to run");
108
109 static const char *hwsim_alpha2s[] = {
110         "FI",
111         "AL",
112         "US",
113         "DE",
114         "JP",
115         "AL",
116 };
117
118 static const struct ieee80211_regdomain hwsim_world_regdom_custom_01 = {
119         .n_reg_rules = 4,
120         .alpha2 =  "99",
121         .reg_rules = {
122                 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
123                 REG_RULE(2484-10, 2484+10, 40, 0, 20, 0),
124                 REG_RULE(5150-10, 5240+10, 40, 0, 30, 0),
125                 REG_RULE(5745-10, 5825+10, 40, 0, 30, 0),
126         }
127 };
128
129 static const struct ieee80211_regdomain hwsim_world_regdom_custom_02 = {
130         .n_reg_rules = 2,
131         .alpha2 =  "99",
132         .reg_rules = {
133                 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
134                 REG_RULE(5725-10, 5850+10, 40, 0, 30,
135                         NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS),
136         }
137 };
138
139 struct hwsim_vif_priv {
140         u32 magic;
141         u8 bssid[ETH_ALEN];
142         bool assoc;
143         u16 aid;
144 };
145
146 #define HWSIM_VIF_MAGIC 0x69537748
147
148 static inline void hwsim_check_magic(struct ieee80211_vif *vif)
149 {
150         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
151         WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
152 }
153
154 static inline void hwsim_set_magic(struct ieee80211_vif *vif)
155 {
156         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
157         vp->magic = HWSIM_VIF_MAGIC;
158 }
159
160 static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
161 {
162         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
163         vp->magic = 0;
164 }
165
166 struct hwsim_sta_priv {
167         u32 magic;
168 };
169
170 #define HWSIM_STA_MAGIC 0x6d537748
171
172 static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
173 {
174         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
175         WARN_ON(sp->magic != HWSIM_STA_MAGIC);
176 }
177
178 static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
179 {
180         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
181         sp->magic = HWSIM_STA_MAGIC;
182 }
183
184 static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
185 {
186         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
187         sp->magic = 0;
188 }
189
190 static struct class *hwsim_class;
191
192 static struct net_device *hwsim_mon; /* global monitor netdev */
193
194 #define CHAN2G(_freq)  { \
195         .band = IEEE80211_BAND_2GHZ, \
196         .center_freq = (_freq), \
197         .hw_value = (_freq), \
198         .max_power = 20, \
199 }
200
201 #define CHAN5G(_freq) { \
202         .band = IEEE80211_BAND_5GHZ, \
203         .center_freq = (_freq), \
204         .hw_value = (_freq), \
205         .max_power = 20, \
206 }
207
208 static const struct ieee80211_channel hwsim_channels_2ghz[] = {
209         CHAN2G(2412), /* Channel 1 */
210         CHAN2G(2417), /* Channel 2 */
211         CHAN2G(2422), /* Channel 3 */
212         CHAN2G(2427), /* Channel 4 */
213         CHAN2G(2432), /* Channel 5 */
214         CHAN2G(2437), /* Channel 6 */
215         CHAN2G(2442), /* Channel 7 */
216         CHAN2G(2447), /* Channel 8 */
217         CHAN2G(2452), /* Channel 9 */
218         CHAN2G(2457), /* Channel 10 */
219         CHAN2G(2462), /* Channel 11 */
220         CHAN2G(2467), /* Channel 12 */
221         CHAN2G(2472), /* Channel 13 */
222         CHAN2G(2484), /* Channel 14 */
223 };
224
225 static const struct ieee80211_channel hwsim_channels_5ghz[] = {
226         CHAN5G(5180), /* Channel 36 */
227         CHAN5G(5200), /* Channel 40 */
228         CHAN5G(5220), /* Channel 44 */
229         CHAN5G(5240), /* Channel 48 */
230
231         CHAN5G(5260), /* Channel 52 */
232         CHAN5G(5280), /* Channel 56 */
233         CHAN5G(5300), /* Channel 60 */
234         CHAN5G(5320), /* Channel 64 */
235
236         CHAN5G(5500), /* Channel 100 */
237         CHAN5G(5520), /* Channel 104 */
238         CHAN5G(5540), /* Channel 108 */
239         CHAN5G(5560), /* Channel 112 */
240         CHAN5G(5580), /* Channel 116 */
241         CHAN5G(5600), /* Channel 120 */
242         CHAN5G(5620), /* Channel 124 */
243         CHAN5G(5640), /* Channel 128 */
244         CHAN5G(5660), /* Channel 132 */
245         CHAN5G(5680), /* Channel 136 */
246         CHAN5G(5700), /* Channel 140 */
247
248         CHAN5G(5745), /* Channel 149 */
249         CHAN5G(5765), /* Channel 153 */
250         CHAN5G(5785), /* Channel 157 */
251         CHAN5G(5805), /* Channel 161 */
252         CHAN5G(5825), /* Channel 165 */
253 };
254
255 static const struct ieee80211_rate hwsim_rates[] = {
256         { .bitrate = 10 },
257         { .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
258         { .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
259         { .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
260         { .bitrate = 60 },
261         { .bitrate = 90 },
262         { .bitrate = 120 },
263         { .bitrate = 180 },
264         { .bitrate = 240 },
265         { .bitrate = 360 },
266         { .bitrate = 480 },
267         { .bitrate = 540 }
268 };
269
270 static spinlock_t hwsim_radio_lock;
271 static struct list_head hwsim_radios;
272
273 struct mac80211_hwsim_data {
274         struct list_head list;
275         struct ieee80211_hw *hw;
276         struct device *dev;
277         struct ieee80211_supported_band bands[2];
278         struct ieee80211_channel channels_2ghz[ARRAY_SIZE(hwsim_channels_2ghz)];
279         struct ieee80211_channel channels_5ghz[ARRAY_SIZE(hwsim_channels_5ghz)];
280         struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
281
282         struct ieee80211_channel *channel;
283         unsigned long beacon_int; /* in jiffies unit */
284         unsigned int rx_filter;
285         int started;
286         struct timer_list beacon_timer;
287         enum ps_mode {
288                 PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
289         } ps;
290         bool ps_poll_pending;
291         struct dentry *debugfs;
292         struct dentry *debugfs_ps;
293
294         /*
295          * Only radios in the same group can communicate together (the
296          * channel has to match too). Each bit represents a group. A
297          * radio can be in more then one group.
298          */
299         u64 group;
300         struct dentry *debugfs_group;
301 };
302
303
304 struct hwsim_radiotap_hdr {
305         struct ieee80211_radiotap_header hdr;
306         u8 rt_flags;
307         u8 rt_rate;
308         __le16 rt_channel;
309         __le16 rt_chbitmask;
310 } __attribute__ ((packed));
311
312
313 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
314 {
315         /* TODO: allow packet injection */
316         dev_kfree_skb(skb);
317         return 0;
318 }
319
320
321 static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
322                                       struct sk_buff *tx_skb)
323 {
324         struct mac80211_hwsim_data *data = hw->priv;
325         struct sk_buff *skb;
326         struct hwsim_radiotap_hdr *hdr;
327         u16 flags;
328         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
329         struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
330
331         if (!netif_running(hwsim_mon))
332                 return;
333
334         skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
335         if (skb == NULL)
336                 return;
337
338         hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
339         hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
340         hdr->hdr.it_pad = 0;
341         hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
342         hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
343                                           (1 << IEEE80211_RADIOTAP_RATE) |
344                                           (1 << IEEE80211_RADIOTAP_CHANNEL));
345         hdr->rt_flags = 0;
346         hdr->rt_rate = txrate->bitrate / 5;
347         hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
348         flags = IEEE80211_CHAN_2GHZ;
349         if (txrate->flags & IEEE80211_RATE_ERP_G)
350                 flags |= IEEE80211_CHAN_OFDM;
351         else
352                 flags |= IEEE80211_CHAN_CCK;
353         hdr->rt_chbitmask = cpu_to_le16(flags);
354
355         skb->dev = hwsim_mon;
356         skb_set_mac_header(skb, 0);
357         skb->ip_summed = CHECKSUM_UNNECESSARY;
358         skb->pkt_type = PACKET_OTHERHOST;
359         skb->protocol = htons(ETH_P_802_2);
360         memset(skb->cb, 0, sizeof(skb->cb));
361         netif_rx(skb);
362 }
363
364
365 static bool hwsim_ps_rx_ok(struct mac80211_hwsim_data *data,
366                            struct sk_buff *skb)
367 {
368         switch (data->ps) {
369         case PS_DISABLED:
370                 return true;
371         case PS_ENABLED:
372                 return false;
373         case PS_AUTO_POLL:
374                 /* TODO: accept (some) Beacons by default and other frames only
375                  * if pending PS-Poll has been sent */
376                 return true;
377         case PS_MANUAL_POLL:
378                 /* Allow unicast frames to own address if there is a pending
379                  * PS-Poll */
380                 if (data->ps_poll_pending &&
381                     memcmp(data->hw->wiphy->perm_addr, skb->data + 4,
382                            ETH_ALEN) == 0) {
383                         data->ps_poll_pending = false;
384                         return true;
385                 }
386                 return false;
387         }
388
389         return true;
390 }
391
392
393 static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
394                                     struct sk_buff *skb)
395 {
396         struct mac80211_hwsim_data *data = hw->priv, *data2;
397         bool ack = false;
398         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
400         struct ieee80211_rx_status rx_status;
401
402         memset(&rx_status, 0, sizeof(rx_status));
403         /* TODO: set mactime */
404         rx_status.freq = data->channel->center_freq;
405         rx_status.band = data->channel->band;
406         rx_status.rate_idx = info->control.rates[0].idx;
407         /* TODO: simulate signal strength (and optional packet drop) */
408
409         if (data->ps != PS_DISABLED)
410                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
411
412         /* Copy skb to all enabled radios that are on the current frequency */
413         spin_lock(&hwsim_radio_lock);
414         list_for_each_entry(data2, &hwsim_radios, list) {
415                 struct sk_buff *nskb;
416
417                 if (data == data2)
418                         continue;
419
420                 if (!data2->started || !hwsim_ps_rx_ok(data2, skb) ||
421                     !data->channel || !data2->channel ||
422                     data->channel->center_freq != data2->channel->center_freq ||
423                     !(data->group & data2->group))
424                         continue;
425
426                 nskb = skb_copy(skb, GFP_ATOMIC);
427                 if (nskb == NULL)
428                         continue;
429
430                 if (memcmp(hdr->addr1, data2->hw->wiphy->perm_addr,
431                            ETH_ALEN) == 0)
432                         ack = true;
433                 ieee80211_rx_irqsafe(data2->hw, nskb, &rx_status);
434         }
435         spin_unlock(&hwsim_radio_lock);
436
437         return ack;
438 }
439
440
441 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
442 {
443         bool ack;
444         struct ieee80211_tx_info *txi;
445
446         mac80211_hwsim_monitor_rx(hw, skb);
447
448         if (skb->len < 10) {
449                 /* Should not happen; just a sanity check for addr1 use */
450                 dev_kfree_skb(skb);
451                 return NETDEV_TX_OK;
452         }
453
454         ack = mac80211_hwsim_tx_frame(hw, skb);
455
456         txi = IEEE80211_SKB_CB(skb);
457
458         if (txi->control.vif)
459                 hwsim_check_magic(txi->control.vif);
460         if (txi->control.sta)
461                 hwsim_check_sta_magic(txi->control.sta);
462
463         ieee80211_tx_info_clear_status(txi);
464         if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK) && ack)
465                 txi->flags |= IEEE80211_TX_STAT_ACK;
466         ieee80211_tx_status_irqsafe(hw, skb);
467         return NETDEV_TX_OK;
468 }
469
470
471 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
472 {
473         struct mac80211_hwsim_data *data = hw->priv;
474         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
475         data->started = 1;
476         return 0;
477 }
478
479
480 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
481 {
482         struct mac80211_hwsim_data *data = hw->priv;
483         data->started = 0;
484         del_timer(&data->beacon_timer);
485         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
486 }
487
488
489 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
490                                         struct ieee80211_if_init_conf *conf)
491 {
492         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
493                wiphy_name(hw->wiphy), __func__, conf->type,
494                conf->mac_addr);
495         hwsim_set_magic(conf->vif);
496         return 0;
497 }
498
499
500 static void mac80211_hwsim_remove_interface(
501         struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
502 {
503         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
504                wiphy_name(hw->wiphy), __func__, conf->type,
505                conf->mac_addr);
506         hwsim_check_magic(conf->vif);
507         hwsim_clear_magic(conf->vif);
508 }
509
510
511 static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
512                                      struct ieee80211_vif *vif)
513 {
514         struct ieee80211_hw *hw = arg;
515         struct sk_buff *skb;
516         struct ieee80211_tx_info *info;
517
518         hwsim_check_magic(vif);
519
520         if (vif->type != NL80211_IFTYPE_AP &&
521             vif->type != NL80211_IFTYPE_MESH_POINT)
522                 return;
523
524         skb = ieee80211_beacon_get(hw, vif);
525         if (skb == NULL)
526                 return;
527         info = IEEE80211_SKB_CB(skb);
528
529         mac80211_hwsim_monitor_rx(hw, skb);
530         mac80211_hwsim_tx_frame(hw, skb);
531         dev_kfree_skb(skb);
532 }
533
534
535 static void mac80211_hwsim_beacon(unsigned long arg)
536 {
537         struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
538         struct mac80211_hwsim_data *data = hw->priv;
539
540         if (!data->started)
541                 return;
542
543         ieee80211_iterate_active_interfaces_atomic(
544                 hw, mac80211_hwsim_beacon_tx, hw);
545
546         data->beacon_timer.expires = jiffies + data->beacon_int;
547         add_timer(&data->beacon_timer);
548 }
549
550
551 static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
552 {
553         struct mac80211_hwsim_data *data = hw->priv;
554         struct ieee80211_conf *conf = &hw->conf;
555
556         printk(KERN_DEBUG "%s:%s (freq=%d idle=%d ps=%d)\n",
557                wiphy_name(hw->wiphy), __func__,
558                conf->channel->center_freq,
559                !!(conf->flags & IEEE80211_CONF_IDLE),
560                !!(conf->flags & IEEE80211_CONF_PS));
561
562         data->channel = conf->channel;
563         if (!data->started || !data->beacon_int)
564                 del_timer(&data->beacon_timer);
565         else
566                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
567
568         return 0;
569 }
570
571
572 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
573                                             unsigned int changed_flags,
574                                             unsigned int *total_flags,
575                                             int mc_count,
576                                             struct dev_addr_list *mc_list)
577 {
578         struct mac80211_hwsim_data *data = hw->priv;
579
580         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
581
582         data->rx_filter = 0;
583         if (*total_flags & FIF_PROMISC_IN_BSS)
584                 data->rx_filter |= FIF_PROMISC_IN_BSS;
585         if (*total_flags & FIF_ALLMULTI)
586                 data->rx_filter |= FIF_ALLMULTI;
587
588         *total_flags = data->rx_filter;
589 }
590
591 static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
592                                             struct ieee80211_vif *vif,
593                                             struct ieee80211_bss_conf *info,
594                                             u32 changed)
595 {
596         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
597         struct mac80211_hwsim_data *data = hw->priv;
598
599         hwsim_check_magic(vif);
600
601         printk(KERN_DEBUG "%s:%s(changed=0x%x)\n",
602                wiphy_name(hw->wiphy), __func__, changed);
603
604         if (changed & BSS_CHANGED_BSSID) {
605                 printk(KERN_DEBUG "%s:%s: BSSID changed: %pM\n",
606                        wiphy_name(hw->wiphy), __func__,
607                        info->bssid);
608                 memcpy(vp->bssid, info->bssid, ETH_ALEN);
609         }
610
611         if (changed & BSS_CHANGED_ASSOC) {
612                 printk(KERN_DEBUG "  %s: ASSOC: assoc=%d aid=%d\n",
613                        wiphy_name(hw->wiphy), info->assoc, info->aid);
614                 vp->assoc = info->assoc;
615                 vp->aid = info->aid;
616         }
617
618         if (changed & BSS_CHANGED_BEACON_INT) {
619                 printk(KERN_DEBUG "  %s: BCNINT: %d\n",
620                        wiphy_name(hw->wiphy), info->beacon_int);
621                 data->beacon_int = 1024 * info->beacon_int / 1000 * HZ / 1000;
622                 if (WARN_ON(!data->beacon_int))
623                         data->beacon_int = 1;
624         }
625
626         if (changed & BSS_CHANGED_ERP_CTS_PROT) {
627                 printk(KERN_DEBUG "  %s: ERP_CTS_PROT: %d\n",
628                        wiphy_name(hw->wiphy), info->use_cts_prot);
629         }
630
631         if (changed & BSS_CHANGED_ERP_PREAMBLE) {
632                 printk(KERN_DEBUG "  %s: ERP_PREAMBLE: %d\n",
633                        wiphy_name(hw->wiphy), info->use_short_preamble);
634         }
635
636         if (changed & BSS_CHANGED_ERP_SLOT) {
637                 printk(KERN_DEBUG "  %s: ERP_SLOT: %d\n",
638                        wiphy_name(hw->wiphy), info->use_short_slot);
639         }
640
641         if (changed & BSS_CHANGED_HT) {
642                 printk(KERN_DEBUG "  %s: HT: op_mode=0x%x\n",
643                        wiphy_name(hw->wiphy),
644                        info->ht_operation_mode);
645         }
646
647         if (changed & BSS_CHANGED_BASIC_RATES) {
648                 printk(KERN_DEBUG "  %s: BASIC_RATES: 0x%llx\n",
649                        wiphy_name(hw->wiphy),
650                        (unsigned long long) info->basic_rates);
651         }
652 }
653
654 static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
655                                       struct ieee80211_vif *vif,
656                                       enum sta_notify_cmd cmd,
657                                       struct ieee80211_sta *sta)
658 {
659         hwsim_check_magic(vif);
660         switch (cmd) {
661         case STA_NOTIFY_ADD:
662                 hwsim_set_sta_magic(sta);
663                 break;
664         case STA_NOTIFY_REMOVE:
665                 hwsim_clear_sta_magic(sta);
666                 break;
667         case STA_NOTIFY_SLEEP:
668         case STA_NOTIFY_AWAKE:
669                 /* TODO: make good use of these flags */
670                 break;
671         }
672 }
673
674 static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
675                                   struct ieee80211_sta *sta,
676                                   bool set)
677 {
678         hwsim_check_sta_magic(sta);
679         return 0;
680 }
681
682 static int mac80211_hwsim_conf_tx(
683         struct ieee80211_hw *hw, u16 queue,
684         const struct ieee80211_tx_queue_params *params)
685 {
686         printk(KERN_DEBUG "%s:%s (queue=%d txop=%d cw_min=%d cw_max=%d "
687                "aifs=%d)\n",
688                wiphy_name(hw->wiphy), __func__, queue,
689                params->txop, params->cw_min, params->cw_max, params->aifs);
690         return 0;
691 }
692
693 static const struct ieee80211_ops mac80211_hwsim_ops =
694 {
695         .tx = mac80211_hwsim_tx,
696         .start = mac80211_hwsim_start,
697         .stop = mac80211_hwsim_stop,
698         .add_interface = mac80211_hwsim_add_interface,
699         .remove_interface = mac80211_hwsim_remove_interface,
700         .config = mac80211_hwsim_config,
701         .configure_filter = mac80211_hwsim_configure_filter,
702         .bss_info_changed = mac80211_hwsim_bss_info_changed,
703         .sta_notify = mac80211_hwsim_sta_notify,
704         .set_tim = mac80211_hwsim_set_tim,
705         .conf_tx = mac80211_hwsim_conf_tx,
706 };
707
708
709 static void mac80211_hwsim_free(void)
710 {
711         struct list_head tmplist, *i, *tmp;
712         struct mac80211_hwsim_data *data;
713
714         INIT_LIST_HEAD(&tmplist);
715
716         spin_lock_bh(&hwsim_radio_lock);
717         list_for_each_safe(i, tmp, &hwsim_radios)
718                 list_move(i, &tmplist);
719         spin_unlock_bh(&hwsim_radio_lock);
720
721         list_for_each_entry(data, &tmplist, list) {
722                 debugfs_remove(data->debugfs_group);
723                 debugfs_remove(data->debugfs_ps);
724                 debugfs_remove(data->debugfs);
725                 ieee80211_unregister_hw(data->hw);
726                 device_unregister(data->dev);
727                 ieee80211_free_hw(data->hw);
728         }
729         class_destroy(hwsim_class);
730 }
731
732
733 static struct device_driver mac80211_hwsim_driver = {
734         .name = "mac80211_hwsim"
735 };
736
737 static const struct net_device_ops hwsim_netdev_ops = {
738         .ndo_start_xmit         = hwsim_mon_xmit,
739         .ndo_change_mtu         = eth_change_mtu,
740         .ndo_set_mac_address    = eth_mac_addr,
741         .ndo_validate_addr      = eth_validate_addr,
742 };
743
744 static void hwsim_mon_setup(struct net_device *dev)
745 {
746         dev->netdev_ops = &hwsim_netdev_ops;
747         dev->destructor = free_netdev;
748         ether_setup(dev);
749         dev->tx_queue_len = 0;
750         dev->type = ARPHRD_IEEE80211_RADIOTAP;
751         memset(dev->dev_addr, 0, ETH_ALEN);
752         dev->dev_addr[0] = 0x12;
753 }
754
755
756 static void hwsim_send_ps_poll(void *dat, u8 *mac, struct ieee80211_vif *vif)
757 {
758         struct mac80211_hwsim_data *data = dat;
759         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
760         DECLARE_MAC_BUF(buf);
761         struct sk_buff *skb;
762         struct ieee80211_pspoll *pspoll;
763
764         if (!vp->assoc)
765                 return;
766
767         printk(KERN_DEBUG "%s:%s: send PS-Poll to %pM for aid %d\n",
768                wiphy_name(data->hw->wiphy), __func__, vp->bssid, vp->aid);
769
770         skb = dev_alloc_skb(sizeof(*pspoll));
771         if (!skb)
772                 return;
773         pspoll = (void *) skb_put(skb, sizeof(*pspoll));
774         pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
775                                             IEEE80211_STYPE_PSPOLL |
776                                             IEEE80211_FCTL_PM);
777         pspoll->aid = cpu_to_le16(0xc000 | vp->aid);
778         memcpy(pspoll->bssid, vp->bssid, ETH_ALEN);
779         memcpy(pspoll->ta, mac, ETH_ALEN);
780         if (!mac80211_hwsim_tx_frame(data->hw, skb))
781                 printk(KERN_DEBUG "%s: PS-Poll frame not ack'ed\n", __func__);
782         dev_kfree_skb(skb);
783 }
784
785
786 static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
787                                 struct ieee80211_vif *vif, int ps)
788 {
789         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
790         DECLARE_MAC_BUF(buf);
791         struct sk_buff *skb;
792         struct ieee80211_hdr *hdr;
793
794         if (!vp->assoc)
795                 return;
796
797         printk(KERN_DEBUG "%s:%s: send data::nullfunc to %pM ps=%d\n",
798                wiphy_name(data->hw->wiphy), __func__, vp->bssid, ps);
799
800         skb = dev_alloc_skb(sizeof(*hdr));
801         if (!skb)
802                 return;
803         hdr = (void *) skb_put(skb, sizeof(*hdr) - ETH_ALEN);
804         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
805                                          IEEE80211_STYPE_NULLFUNC |
806                                          (ps ? IEEE80211_FCTL_PM : 0));
807         hdr->duration_id = cpu_to_le16(0);
808         memcpy(hdr->addr1, vp->bssid, ETH_ALEN);
809         memcpy(hdr->addr2, mac, ETH_ALEN);
810         memcpy(hdr->addr3, vp->bssid, ETH_ALEN);
811         if (!mac80211_hwsim_tx_frame(data->hw, skb))
812                 printk(KERN_DEBUG "%s: nullfunc frame not ack'ed\n", __func__);
813         dev_kfree_skb(skb);
814 }
815
816
817 static void hwsim_send_nullfunc_ps(void *dat, u8 *mac,
818                                    struct ieee80211_vif *vif)
819 {
820         struct mac80211_hwsim_data *data = dat;
821         hwsim_send_nullfunc(data, mac, vif, 1);
822 }
823
824
825 static void hwsim_send_nullfunc_no_ps(void *dat, u8 *mac,
826                                       struct ieee80211_vif *vif)
827 {
828         struct mac80211_hwsim_data *data = dat;
829         hwsim_send_nullfunc(data, mac, vif, 0);
830 }
831
832
833 static int hwsim_fops_ps_read(void *dat, u64 *val)
834 {
835         struct mac80211_hwsim_data *data = dat;
836         *val = data->ps;
837         return 0;
838 }
839
840 static int hwsim_fops_ps_write(void *dat, u64 val)
841 {
842         struct mac80211_hwsim_data *data = dat;
843         enum ps_mode old_ps;
844
845         if (val != PS_DISABLED && val != PS_ENABLED && val != PS_AUTO_POLL &&
846             val != PS_MANUAL_POLL)
847                 return -EINVAL;
848
849         old_ps = data->ps;
850         data->ps = val;
851
852         if (val == PS_MANUAL_POLL) {
853                 ieee80211_iterate_active_interfaces(data->hw,
854                                                     hwsim_send_ps_poll, data);
855                 data->ps_poll_pending = true;
856         } else if (old_ps == PS_DISABLED && val != PS_DISABLED) {
857                 ieee80211_iterate_active_interfaces(data->hw,
858                                                     hwsim_send_nullfunc_ps,
859                                                     data);
860         } else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
861                 ieee80211_iterate_active_interfaces(data->hw,
862                                                     hwsim_send_nullfunc_no_ps,
863                                                     data);
864         }
865
866         return 0;
867 }
868
869 DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_ps, hwsim_fops_ps_read, hwsim_fops_ps_write,
870                         "%llu\n");
871
872
873 static int hwsim_fops_group_read(void *dat, u64 *val)
874 {
875         struct mac80211_hwsim_data *data = dat;
876         *val = data->group;
877         return 0;
878 }
879
880 static int hwsim_fops_group_write(void *dat, u64 val)
881 {
882         struct mac80211_hwsim_data *data = dat;
883         data->group = val;
884         return 0;
885 }
886
887 DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_group,
888                         hwsim_fops_group_read, hwsim_fops_group_write,
889                         "%llx\n");
890
891 static int __init init_mac80211_hwsim(void)
892 {
893         int i, err = 0;
894         u8 addr[ETH_ALEN];
895         struct mac80211_hwsim_data *data;
896         struct ieee80211_hw *hw;
897         enum ieee80211_band band;
898
899         if (radios < 1 || radios > 100)
900                 return -EINVAL;
901
902         spin_lock_init(&hwsim_radio_lock);
903         INIT_LIST_HEAD(&hwsim_radios);
904
905         hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
906         if (IS_ERR(hwsim_class))
907                 return PTR_ERR(hwsim_class);
908
909         memset(addr, 0, ETH_ALEN);
910         addr[0] = 0x02;
911
912         for (i = 0; i < radios; i++) {
913                 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
914                        i);
915                 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
916                 if (!hw) {
917                         printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
918                                "failed\n");
919                         err = -ENOMEM;
920                         goto failed;
921                 }
922                 data = hw->priv;
923                 data->hw = hw;
924
925                 data->dev = device_create(hwsim_class, NULL, 0, hw,
926                                           "hwsim%d", i);
927                 if (IS_ERR(data->dev)) {
928                         printk(KERN_DEBUG
929                                "mac80211_hwsim: device_create "
930                                "failed (%ld)\n", PTR_ERR(data->dev));
931                         err = -ENOMEM;
932                         goto failed_drvdata;
933                 }
934                 data->dev->driver = &mac80211_hwsim_driver;
935
936                 SET_IEEE80211_DEV(hw, data->dev);
937                 addr[3] = i >> 8;
938                 addr[4] = i;
939                 SET_IEEE80211_PERM_ADDR(hw, addr);
940
941                 hw->channel_change_time = 1;
942                 hw->queues = 4;
943                 hw->wiphy->interface_modes =
944                         BIT(NL80211_IFTYPE_STATION) |
945                         BIT(NL80211_IFTYPE_AP) |
946                         BIT(NL80211_IFTYPE_MESH_POINT);
947
948                 hw->flags = IEEE80211_HW_MFP_CAPABLE;
949
950                 /* ask mac80211 to reserve space for magic */
951                 hw->vif_data_size = sizeof(struct hwsim_vif_priv);
952                 hw->sta_data_size = sizeof(struct hwsim_sta_priv);
953
954                 memcpy(data->channels_2ghz, hwsim_channels_2ghz,
955                         sizeof(hwsim_channels_2ghz));
956                 memcpy(data->channels_5ghz, hwsim_channels_5ghz,
957                         sizeof(hwsim_channels_5ghz));
958                 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
959
960                 for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
961                         struct ieee80211_supported_band *sband = &data->bands[band];
962                         switch (band) {
963                         case IEEE80211_BAND_2GHZ:
964                                 sband->channels = data->channels_2ghz;
965                                 sband->n_channels =
966                                         ARRAY_SIZE(hwsim_channels_2ghz);
967                                 break;
968                         case IEEE80211_BAND_5GHZ:
969                                 sband->channels = data->channels_5ghz;
970                                 sband->n_channels =
971                                         ARRAY_SIZE(hwsim_channels_5ghz);
972                                 break;
973                         default:
974                                 break;
975                         }
976
977                         sband->bitrates = data->rates;
978                         sband->n_bitrates = ARRAY_SIZE(hwsim_rates);
979
980                         sband->ht_cap.ht_supported = true;
981                         sband->ht_cap.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
982                                 IEEE80211_HT_CAP_GRN_FLD |
983                                 IEEE80211_HT_CAP_SGI_40 |
984                                 IEEE80211_HT_CAP_DSSSCCK40;
985                         sband->ht_cap.ampdu_factor = 0x3;
986                         sband->ht_cap.ampdu_density = 0x6;
987                         memset(&sband->ht_cap.mcs, 0,
988                                sizeof(sband->ht_cap.mcs));
989                         sband->ht_cap.mcs.rx_mask[0] = 0xff;
990                         sband->ht_cap.mcs.rx_mask[1] = 0xff;
991                         sband->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
992
993                         hw->wiphy->bands[band] = sband;
994                 }
995                 /* By default all radios are belonging to the first group */
996                 data->group = 1;
997
998                 /* Work to be done prior to ieee80211_register_hw() */
999                 switch (regtest) {
1000                 case HWSIM_REGTEST_DISABLED:
1001                 case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
1002                 case HWSIM_REGTEST_DRIVER_REG_ALL:
1003                 case HWSIM_REGTEST_DIFF_COUNTRY:
1004                         /*
1005                          * Nothing to be done for driver regulatory domain
1006                          * hints prior to ieee80211_register_hw()
1007                          */
1008                         break;
1009                 case HWSIM_REGTEST_WORLD_ROAM:
1010                         if (i == 0) {
1011                                 hw->wiphy->custom_regulatory = true;
1012                                 wiphy_apply_custom_regulatory(hw->wiphy,
1013                                         &hwsim_world_regdom_custom_01);
1014                         }
1015                         break;
1016                 case HWSIM_REGTEST_CUSTOM_WORLD:
1017                         hw->wiphy->custom_regulatory = true;
1018                         wiphy_apply_custom_regulatory(hw->wiphy,
1019                                 &hwsim_world_regdom_custom_01);
1020                         break;
1021                 case HWSIM_REGTEST_CUSTOM_WORLD_2:
1022                         if (i == 0) {
1023                                 hw->wiphy->custom_regulatory = true;
1024                                 wiphy_apply_custom_regulatory(hw->wiphy,
1025                                         &hwsim_world_regdom_custom_01);
1026                         } else if (i == 1) {
1027                                 hw->wiphy->custom_regulatory = true;
1028                                 wiphy_apply_custom_regulatory(hw->wiphy,
1029                                         &hwsim_world_regdom_custom_02);
1030                         }
1031                         break;
1032                 case HWSIM_REGTEST_STRICT_ALL:
1033                         hw->wiphy->strict_regulatory = true;
1034                         break;
1035                 case HWSIM_REGTEST_STRICT_FOLLOW:
1036                 case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
1037                         if (i == 0)
1038                                 hw->wiphy->strict_regulatory = true;
1039                         break;
1040                 case HWSIM_REGTEST_ALL:
1041                         if (i == 0) {
1042                                 hw->wiphy->custom_regulatory = true;
1043                                 wiphy_apply_custom_regulatory(hw->wiphy,
1044                                         &hwsim_world_regdom_custom_01);
1045                         } else if (i == 1) {
1046                                 hw->wiphy->custom_regulatory = true;
1047                                 wiphy_apply_custom_regulatory(hw->wiphy,
1048                                         &hwsim_world_regdom_custom_02);
1049                         } else if (i == 4)
1050                                 hw->wiphy->strict_regulatory = true;
1051                         break;
1052                 default:
1053                         break;
1054                 }
1055
1056                 /* give the regulatory workqueue a chance to run */
1057                 if (regtest)
1058                         schedule_timeout_interruptible(1);
1059                 err = ieee80211_register_hw(hw);
1060                 if (err < 0) {
1061                         printk(KERN_DEBUG "mac80211_hwsim: "
1062                                "ieee80211_register_hw failed (%d)\n", err);
1063                         goto failed_hw;
1064                 }
1065
1066                 /* Work to be done after to ieee80211_register_hw() */
1067                 switch (regtest) {
1068                 case HWSIM_REGTEST_WORLD_ROAM:
1069                 case HWSIM_REGTEST_DISABLED:
1070                         break;
1071                 case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
1072                         if (!i)
1073                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
1074                         break;
1075                 case HWSIM_REGTEST_DRIVER_REG_ALL:
1076                 case HWSIM_REGTEST_STRICT_ALL:
1077                         regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
1078                         break;
1079                 case HWSIM_REGTEST_DIFF_COUNTRY:
1080                         if (i < ARRAY_SIZE(hwsim_alpha2s))
1081                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[i]);
1082                         break;
1083                 case HWSIM_REGTEST_CUSTOM_WORLD:
1084                 case HWSIM_REGTEST_CUSTOM_WORLD_2:
1085                         /*
1086                          * Nothing to be done for custom world regulatory
1087                          * domains after to ieee80211_register_hw
1088                          */
1089                         break;
1090                 case HWSIM_REGTEST_STRICT_FOLLOW:
1091                         if (i == 0)
1092                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
1093                         break;
1094                 case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
1095                         if (i == 0)
1096                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
1097                         else if (i == 1)
1098                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
1099                         break;
1100                 case HWSIM_REGTEST_ALL:
1101                         if (i == 2)
1102                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
1103                         else if (i == 3)
1104                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
1105                         else if (i == 4)
1106                                 regulatory_hint(hw->wiphy, hwsim_alpha2s[2]);
1107                         break;
1108                 default:
1109                         break;
1110                 }
1111
1112                 printk(KERN_DEBUG "%s: hwaddr %pM registered\n",
1113                        wiphy_name(hw->wiphy),
1114                        hw->wiphy->perm_addr);
1115
1116                 data->debugfs = debugfs_create_dir("hwsim",
1117                                                    hw->wiphy->debugfsdir);
1118                 data->debugfs_ps = debugfs_create_file("ps", 0666,
1119                                                        data->debugfs, data,
1120                                                        &hwsim_fops_ps);
1121                 data->debugfs_group = debugfs_create_file("group", 0666,
1122                                                         data->debugfs, data,
1123                                                         &hwsim_fops_group);
1124
1125                 setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
1126                             (unsigned long) hw);
1127
1128                 list_add_tail(&data->list, &hwsim_radios);
1129         }
1130
1131         hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
1132         if (hwsim_mon == NULL)
1133                 goto failed;
1134
1135         rtnl_lock();
1136
1137         err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
1138         if (err < 0)
1139                 goto failed_mon;
1140
1141
1142         err = register_netdevice(hwsim_mon);
1143         if (err < 0)
1144                 goto failed_mon;
1145
1146         rtnl_unlock();
1147
1148         return 0;
1149
1150 failed_mon:
1151         rtnl_unlock();
1152         free_netdev(hwsim_mon);
1153         mac80211_hwsim_free();
1154         return err;
1155
1156 failed_hw:
1157         device_unregister(data->dev);
1158 failed_drvdata:
1159         ieee80211_free_hw(hw);
1160 failed:
1161         mac80211_hwsim_free();
1162         return err;
1163 }
1164
1165
1166 static void __exit exit_mac80211_hwsim(void)
1167 {
1168         printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");
1169
1170         unregister_netdev(hwsim_mon);
1171         mac80211_hwsim_free();
1172 }
1173
1174
1175 module_init(init_mac80211_hwsim);
1176 module_exit(exit_mac80211_hwsim);