Merge git://bedivere.hansenpartnership.com/git/scsi-rc-fixes-2.6
[linux-2.6.git] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos_params.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35
36 static struct lock_class_key ieee80211_rx_skb_queue_class;
37
38 void ieee80211_configure_filter(struct ieee80211_local *local)
39 {
40         u64 mc;
41         unsigned int changed_flags;
42         unsigned int new_flags = 0;
43
44         if (atomic_read(&local->iff_promiscs))
45                 new_flags |= FIF_PROMISC_IN_BSS;
46
47         if (atomic_read(&local->iff_allmultis))
48                 new_flags |= FIF_ALLMULTI;
49
50         if (local->monitors || local->scanning)
51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53         if (local->fif_probe_req || local->probe_req_reg)
54                 new_flags |= FIF_PROBE_REQ;
55
56         if (local->fif_fcsfail)
57                 new_flags |= FIF_FCSFAIL;
58
59         if (local->fif_plcpfail)
60                 new_flags |= FIF_PLCPFAIL;
61
62         if (local->fif_control)
63                 new_flags |= FIF_CONTROL;
64
65         if (local->fif_other_bss)
66                 new_flags |= FIF_OTHER_BSS;
67
68         if (local->fif_pspoll)
69                 new_flags |= FIF_PSPOLL;
70
71         spin_lock_bh(&local->filter_lock);
72         changed_flags = local->filter_flags ^ new_flags;
73
74         mc = drv_prepare_multicast(local, &local->mc_list);
75         spin_unlock_bh(&local->filter_lock);
76
77         /* be a bit nasty */
78         new_flags |= (1<<31);
79
80         drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82         WARN_ON(new_flags & (1<<31));
83
84         local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89         struct ieee80211_local *local =
90                 container_of(work, struct ieee80211_local, reconfig_filter);
91
92         ieee80211_configure_filter(local);
93 }
94
95 /*
96  * Returns true if we are logically configured to be on
97  * the operating channel AND the hardware-conf is currently
98  * configured on the operating channel.  Compares channel-type
99  * as well.
100  */
101 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
102 {
103         struct ieee80211_channel *chan, *scan_chan;
104         enum nl80211_channel_type channel_type;
105
106         /* This logic needs to match logic in ieee80211_hw_config */
107         if (local->scan_channel) {
108                 chan = local->scan_channel;
109                 /* If scanning on oper channel, use whatever channel-type
110                  * is currently in use.
111                  */
112                 if (chan == local->oper_channel)
113                         channel_type = local->_oper_channel_type;
114                 else
115                         channel_type = NL80211_CHAN_NO_HT;
116         } else if (local->tmp_channel) {
117                 chan = scan_chan = local->tmp_channel;
118                 channel_type = local->tmp_channel_type;
119         } else {
120                 chan = local->oper_channel;
121                 channel_type = local->_oper_channel_type;
122         }
123
124         if (chan != local->oper_channel ||
125             channel_type != local->_oper_channel_type)
126                 return false;
127
128         /* Check current hardware-config against oper_channel. */
129         if ((local->oper_channel != local->hw.conf.channel) ||
130             (local->_oper_channel_type != local->hw.conf.channel_type))
131                 return false;
132
133         return true;
134 }
135
136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137 {
138         struct ieee80211_channel *chan, *scan_chan;
139         int ret = 0;
140         int power;
141         enum nl80211_channel_type channel_type;
142         u32 offchannel_flag;
143
144         might_sleep();
145
146         scan_chan = local->scan_channel;
147
148         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
149          * may need to change as well.
150          */
151         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
152         if (scan_chan) {
153                 chan = scan_chan;
154                 /* If scanning on oper channel, use whatever channel-type
155                  * is currently in use.
156                  */
157                 if (chan == local->oper_channel)
158                         channel_type = local->_oper_channel_type;
159                 else
160                         channel_type = NL80211_CHAN_NO_HT;
161         } else if (local->tmp_channel) {
162                 chan = scan_chan = local->tmp_channel;
163                 channel_type = local->tmp_channel_type;
164         } else {
165                 chan = local->oper_channel;
166                 channel_type = local->_oper_channel_type;
167         }
168
169         if (chan != local->oper_channel ||
170             channel_type != local->_oper_channel_type)
171                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
172         else
173                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
174
175         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
176
177         if (offchannel_flag || chan != local->hw.conf.channel ||
178             channel_type != local->hw.conf.channel_type) {
179                 local->hw.conf.channel = chan;
180                 local->hw.conf.channel_type = channel_type;
181                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
182         }
183
184         if (!conf_is_ht(&local->hw.conf)) {
185                 /*
186                  * mac80211.h documents that this is only valid
187                  * when the channel is set to an HT type, and
188                  * that otherwise STATIC is used.
189                  */
190                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
191         } else if (local->hw.conf.smps_mode != local->smps_mode) {
192                 local->hw.conf.smps_mode = local->smps_mode;
193                 changed |= IEEE80211_CONF_CHANGE_SMPS;
194         }
195
196         if ((local->scanning & SCAN_SW_SCANNING) ||
197             (local->scanning & SCAN_HW_SCANNING))
198                 power = chan->max_power;
199         else
200                 power = local->power_constr_level ?
201                         (chan->max_power - local->power_constr_level) :
202                         chan->max_power;
203
204         if (local->user_power_level >= 0)
205                 power = min(power, local->user_power_level);
206
207         if (local->hw.conf.power_level != power) {
208                 changed |= IEEE80211_CONF_CHANGE_POWER;
209                 local->hw.conf.power_level = power;
210         }
211
212         if (changed && local->open_count) {
213                 ret = drv_config(local, changed);
214                 /*
215                  * Goal:
216                  * HW reconfiguration should never fail, the driver has told
217                  * us what it can support so it should live up to that promise.
218                  *
219                  * Current status:
220                  * rfkill is not integrated with mac80211 and a
221                  * configuration command can thus fail if hardware rfkill
222                  * is enabled
223                  *
224                  * FIXME: integrate rfkill with mac80211 and then add this
225                  * WARN_ON() back
226                  *
227                  */
228                 /* WARN_ON(ret); */
229         }
230
231         return ret;
232 }
233
234 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
235                                       u32 changed)
236 {
237         struct ieee80211_local *local = sdata->local;
238         static const u8 zero[ETH_ALEN] = { 0 };
239
240         if (!changed)
241                 return;
242
243         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
244                 /*
245                  * While not associated, claim a BSSID of all-zeroes
246                  * so that drivers don't do any weird things with the
247                  * BSSID at that time.
248                  */
249                 if (sdata->vif.bss_conf.assoc)
250                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
251                 else
252                         sdata->vif.bss_conf.bssid = zero;
253         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
254                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
255         else if (sdata->vif.type == NL80211_IFTYPE_AP)
256                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
257         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
258                 sdata->vif.bss_conf.bssid = NULL;
259         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
260                 sdata->vif.bss_conf.bssid = zero;
261         } else {
262                 WARN_ON(1);
263                 return;
264         }
265
266         switch (sdata->vif.type) {
267         case NL80211_IFTYPE_AP:
268         case NL80211_IFTYPE_ADHOC:
269         case NL80211_IFTYPE_WDS:
270         case NL80211_IFTYPE_MESH_POINT:
271                 break;
272         default:
273                 /* do not warn to simplify caller in scan.c */
274                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
275                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
276                         return;
277                 break;
278         }
279
280         if (changed & BSS_CHANGED_BEACON_ENABLED) {
281                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
282                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
283                         sdata->vif.bss_conf.enable_beacon = false;
284                 } else {
285                         /*
286                          * Beacon should be enabled, but AP mode must
287                          * check whether there is a beacon configured.
288                          */
289                         switch (sdata->vif.type) {
290                         case NL80211_IFTYPE_AP:
291                                 sdata->vif.bss_conf.enable_beacon =
292                                         !!sdata->u.ap.beacon;
293                                 break;
294                         case NL80211_IFTYPE_ADHOC:
295                                 sdata->vif.bss_conf.enable_beacon =
296                                         !!sdata->u.ibss.presp;
297                                 break;
298 #ifdef CONFIG_MAC80211_MESH
299                         case NL80211_IFTYPE_MESH_POINT:
300                                 sdata->vif.bss_conf.enable_beacon =
301                                         !!sdata->u.mesh.mesh_id_len;
302                                 break;
303 #endif
304                         default:
305                                 /* not reached */
306                                 WARN_ON(1);
307                                 break;
308                         }
309                 }
310         }
311
312         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
313 }
314
315 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
316 {
317         sdata->vif.bss_conf.use_cts_prot = false;
318         sdata->vif.bss_conf.use_short_preamble = false;
319         sdata->vif.bss_conf.use_short_slot = false;
320         return BSS_CHANGED_ERP_CTS_PROT |
321                BSS_CHANGED_ERP_PREAMBLE |
322                BSS_CHANGED_ERP_SLOT;
323 }
324
325 static void ieee80211_tasklet_handler(unsigned long data)
326 {
327         struct ieee80211_local *local = (struct ieee80211_local *) data;
328         struct sk_buff *skb;
329
330         while ((skb = skb_dequeue(&local->skb_queue)) ||
331                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332                 switch (skb->pkt_type) {
333                 case IEEE80211_RX_MSG:
334                         /* Clear skb->pkt_type in order to not confuse kernel
335                          * netstack. */
336                         skb->pkt_type = 0;
337                         ieee80211_rx(local_to_hw(local), skb);
338                         break;
339                 case IEEE80211_TX_STATUS_MSG:
340                         skb->pkt_type = 0;
341                         ieee80211_tx_status(local_to_hw(local), skb);
342                         break;
343                 default:
344                         WARN(1, "mac80211: Packet is of unknown type %d\n",
345                              skb->pkt_type);
346                         dev_kfree_skb(skb);
347                         break;
348                 }
349         }
350 }
351
352 static void ieee80211_restart_work(struct work_struct *work)
353 {
354         struct ieee80211_local *local =
355                 container_of(work, struct ieee80211_local, restart_work);
356
357         /* wait for scan work complete */
358         flush_workqueue(local->workqueue);
359
360         mutex_lock(&local->mtx);
361         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
362              local->sched_scanning,
363                 "%s called with hardware scan in progress\n", __func__);
364         mutex_unlock(&local->mtx);
365
366         rtnl_lock();
367         ieee80211_scan_cancel(local);
368         ieee80211_reconfig(local);
369         rtnl_unlock();
370 }
371
372 void ieee80211_restart_hw(struct ieee80211_hw *hw)
373 {
374         struct ieee80211_local *local = hw_to_local(hw);
375
376         trace_api_restart_hw(local);
377
378         wiphy_info(hw->wiphy,
379                    "Hardware restart was requested\n");
380
381         /* use this reason, ieee80211_reconfig will unblock it */
382         ieee80211_stop_queues_by_reason(hw,
383                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
384
385         schedule_work(&local->restart_work);
386 }
387 EXPORT_SYMBOL(ieee80211_restart_hw);
388
389 static void ieee80211_recalc_smps_work(struct work_struct *work)
390 {
391         struct ieee80211_local *local =
392                 container_of(work, struct ieee80211_local, recalc_smps);
393
394         mutex_lock(&local->iflist_mtx);
395         ieee80211_recalc_smps(local);
396         mutex_unlock(&local->iflist_mtx);
397 }
398
399 #ifdef CONFIG_INET
400 static int ieee80211_ifa_changed(struct notifier_block *nb,
401                                  unsigned long data, void *arg)
402 {
403         struct in_ifaddr *ifa = arg;
404         struct ieee80211_local *local =
405                 container_of(nb, struct ieee80211_local,
406                              ifa_notifier);
407         struct net_device *ndev = ifa->ifa_dev->dev;
408         struct wireless_dev *wdev = ndev->ieee80211_ptr;
409         struct in_device *idev;
410         struct ieee80211_sub_if_data *sdata;
411         struct ieee80211_bss_conf *bss_conf;
412         struct ieee80211_if_managed *ifmgd;
413         int c = 0;
414
415         /* Make sure it's our interface that got changed */
416         if (!wdev)
417                 return NOTIFY_DONE;
418
419         if (wdev->wiphy != local->hw.wiphy)
420                 return NOTIFY_DONE;
421
422         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
423         bss_conf = &sdata->vif.bss_conf;
424
425         if (!ieee80211_sdata_running(sdata))
426                 return NOTIFY_DONE;
427
428         /* ARP filtering is only supported in managed mode */
429         if (sdata->vif.type != NL80211_IFTYPE_STATION)
430                 return NOTIFY_DONE;
431
432         idev = __in_dev_get_rtnl(sdata->dev);
433         if (!idev)
434                 return NOTIFY_DONE;
435
436         ifmgd = &sdata->u.mgd;
437         mutex_lock(&ifmgd->mtx);
438
439         /* Copy the addresses to the bss_conf list */
440         ifa = idev->ifa_list;
441         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
442                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
443                 ifa = ifa->ifa_next;
444                 c++;
445         }
446
447         /* If not all addresses fit the list, disable filtering */
448         if (ifa) {
449                 sdata->arp_filter_state = false;
450                 c = 0;
451         } else {
452                 sdata->arp_filter_state = true;
453         }
454         bss_conf->arp_addr_cnt = c;
455
456         /* Configure driver only if associated */
457         if (ifmgd->associated) {
458                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
459                 ieee80211_bss_info_change_notify(sdata,
460                                                  BSS_CHANGED_ARP_FILTER);
461         }
462
463         mutex_unlock(&ifmgd->mtx);
464
465         return NOTIFY_DONE;
466 }
467 #endif
468
469 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
470 {
471         struct ieee80211_local *local =
472                 container_of(napi, struct ieee80211_local, napi);
473
474         return local->ops->napi_poll(&local->hw, budget);
475 }
476
477 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
478 {
479         struct ieee80211_local *local = hw_to_local(hw);
480
481         napi_schedule(&local->napi);
482 }
483 EXPORT_SYMBOL(ieee80211_napi_schedule);
484
485 void ieee80211_napi_complete(struct ieee80211_hw *hw)
486 {
487         struct ieee80211_local *local = hw_to_local(hw);
488
489         napi_complete(&local->napi);
490 }
491 EXPORT_SYMBOL(ieee80211_napi_complete);
492
493 /* There isn't a lot of sense in it, but you can transmit anything you like */
494 static const struct ieee80211_txrx_stypes
495 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
496         [NL80211_IFTYPE_ADHOC] = {
497                 .tx = 0xffff,
498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
499         },
500         [NL80211_IFTYPE_STATION] = {
501                 .tx = 0xffff,
502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
504         },
505         [NL80211_IFTYPE_AP] = {
506                 .tx = 0xffff,
507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
513                         BIT(IEEE80211_STYPE_ACTION >> 4),
514         },
515         [NL80211_IFTYPE_AP_VLAN] = {
516                 /* copy AP */
517                 .tx = 0xffff,
518                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
519                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
520                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
521                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
522                         BIT(IEEE80211_STYPE_AUTH >> 4) |
523                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
524                         BIT(IEEE80211_STYPE_ACTION >> 4),
525         },
526         [NL80211_IFTYPE_P2P_CLIENT] = {
527                 .tx = 0xffff,
528                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
529                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
530         },
531         [NL80211_IFTYPE_P2P_GO] = {
532                 .tx = 0xffff,
533                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
534                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
535                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
536                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
537                         BIT(IEEE80211_STYPE_AUTH >> 4) |
538                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
539                         BIT(IEEE80211_STYPE_ACTION >> 4),
540         },
541         [NL80211_IFTYPE_MESH_POINT] = {
542                 .tx = 0xffff,
543                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
544                         BIT(IEEE80211_STYPE_AUTH >> 4) |
545                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
546         },
547 };
548
549 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
550                                         const struct ieee80211_ops *ops)
551 {
552         struct ieee80211_local *local;
553         int priv_size, i;
554         struct wiphy *wiphy;
555
556         /* Ensure 32-byte alignment of our private data and hw private data.
557          * We use the wiphy priv data for both our ieee80211_local and for
558          * the driver's private data
559          *
560          * In memory it'll be like this:
561          *
562          * +-------------------------+
563          * | struct wiphy           |
564          * +-------------------------+
565          * | struct ieee80211_local  |
566          * +-------------------------+
567          * | driver's private data   |
568          * +-------------------------+
569          *
570          */
571         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
572
573         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
574
575         if (!wiphy)
576                 return NULL;
577
578         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
579
580         wiphy->privid = mac80211_wiphy_privid;
581
582         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
583                         WIPHY_FLAG_4ADDR_AP |
584                         WIPHY_FLAG_4ADDR_STATION;
585
586         if (!ops->set_key)
587                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
588
589         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
590
591         local = wiphy_priv(wiphy);
592
593         local->hw.wiphy = wiphy;
594
595         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
596
597         BUG_ON(!ops->tx);
598         BUG_ON(!ops->start);
599         BUG_ON(!ops->stop);
600         BUG_ON(!ops->config);
601         BUG_ON(!ops->add_interface);
602         BUG_ON(!ops->remove_interface);
603         BUG_ON(!ops->configure_filter);
604         local->ops = ops;
605
606         /* set up some defaults */
607         local->hw.queues = 1;
608         local->hw.max_rates = 1;
609         local->hw.max_report_rates = 0;
610         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
611         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
612         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
613         local->user_power_level = -1;
614         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
615         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
616
617         INIT_LIST_HEAD(&local->interfaces);
618
619         __hw_addr_init(&local->mc_list);
620
621         mutex_init(&local->iflist_mtx);
622         mutex_init(&local->mtx);
623
624         mutex_init(&local->key_mtx);
625         spin_lock_init(&local->filter_lock);
626         spin_lock_init(&local->queue_stop_reason_lock);
627
628         /*
629          * The rx_skb_queue is only accessed from tasklets,
630          * but other SKB queues are used from within IRQ
631          * context. Therefore, this one needs a different
632          * locking class so our direct, non-irq-safe use of
633          * the queue's lock doesn't throw lockdep warnings.
634          */
635         skb_queue_head_init_class(&local->rx_skb_queue,
636                                   &ieee80211_rx_skb_queue_class);
637
638         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
639
640         ieee80211_work_init(local);
641
642         INIT_WORK(&local->restart_work, ieee80211_restart_work);
643
644         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
645         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
646         local->smps_mode = IEEE80211_SMPS_OFF;
647
648         INIT_WORK(&local->dynamic_ps_enable_work,
649                   ieee80211_dynamic_ps_enable_work);
650         INIT_WORK(&local->dynamic_ps_disable_work,
651                   ieee80211_dynamic_ps_disable_work);
652         setup_timer(&local->dynamic_ps_timer,
653                     ieee80211_dynamic_ps_timer, (unsigned long) local);
654
655         INIT_WORK(&local->sched_scan_stopped_work,
656                   ieee80211_sched_scan_stopped_work);
657
658         sta_info_init(local);
659
660         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
661                 skb_queue_head_init(&local->pending[i]);
662                 atomic_set(&local->agg_queue_stop[i], 0);
663         }
664         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
665                      (unsigned long)local);
666
667         tasklet_init(&local->tasklet,
668                      ieee80211_tasklet_handler,
669                      (unsigned long) local);
670
671         skb_queue_head_init(&local->skb_queue);
672         skb_queue_head_init(&local->skb_queue_unreliable);
673
674         /* init dummy netdev for use w/ NAPI */
675         init_dummy_netdev(&local->napi_dev);
676
677         ieee80211_led_names(local);
678
679         ieee80211_hw_roc_setup(local);
680
681         return local_to_hw(local);
682 }
683 EXPORT_SYMBOL(ieee80211_alloc_hw);
684
685 int ieee80211_register_hw(struct ieee80211_hw *hw)
686 {
687         struct ieee80211_local *local = hw_to_local(hw);
688         int result, i;
689         enum ieee80211_band band;
690         int channels, max_bitrates;
691         bool supp_ht;
692         static const u32 cipher_suites[] = {
693                 /* keep WEP first, it may be removed below */
694                 WLAN_CIPHER_SUITE_WEP40,
695                 WLAN_CIPHER_SUITE_WEP104,
696                 WLAN_CIPHER_SUITE_TKIP,
697                 WLAN_CIPHER_SUITE_CCMP,
698
699                 /* keep last -- depends on hw flags! */
700                 WLAN_CIPHER_SUITE_AES_CMAC
701         };
702
703         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
704 #ifdef CONFIG_PM
705             && (!local->ops->suspend || !local->ops->resume)
706 #endif
707             )
708                 return -EINVAL;
709
710         if (hw->max_report_rates == 0)
711                 hw->max_report_rates = hw->max_rates;
712
713         /*
714          * generic code guarantees at least one band,
715          * set this very early because much code assumes
716          * that hw.conf.channel is assigned
717          */
718         channels = 0;
719         max_bitrates = 0;
720         supp_ht = false;
721         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
722                 struct ieee80211_supported_band *sband;
723
724                 sband = local->hw.wiphy->bands[band];
725                 if (!sband)
726                         continue;
727                 if (!local->oper_channel) {
728                         /* init channel we're on */
729                         local->hw.conf.channel =
730                         local->oper_channel = &sband->channels[0];
731                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
732                 }
733                 channels += sband->n_channels;
734
735                 if (max_bitrates < sband->n_bitrates)
736                         max_bitrates = sband->n_bitrates;
737                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
738         }
739
740         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
741                                       sizeof(void *) * channels, GFP_KERNEL);
742         if (!local->int_scan_req)
743                 return -ENOMEM;
744
745         /* if low-level driver supports AP, we also support VLAN */
746         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
747                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
748                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
749         }
750
751         /* mac80211 always supports monitor */
752         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
753         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
754
755         /*
756          * mac80211 doesn't support more than 1 channel, and also not more
757          * than one IBSS interface
758          */
759         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
760                 const struct ieee80211_iface_combination *c;
761                 int j;
762
763                 c = &hw->wiphy->iface_combinations[i];
764
765                 if (c->num_different_channels > 1)
766                         return -EINVAL;
767
768                 for (j = 0; j < c->n_limits; j++)
769                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
770                             c->limits[j].max > 1)
771                                 return -EINVAL;
772         }
773
774 #ifndef CONFIG_MAC80211_MESH
775         /* mesh depends on Kconfig, but drivers should set it if they want */
776         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
777 #endif
778
779         /* if the underlying driver supports mesh, mac80211 will (at least)
780          * provide routing of mesh authentication frames to userspace */
781         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
782                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
783
784         /* mac80211 supports control port protocol changing */
785         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
786
787         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
788                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
789         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
790                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
791
792         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
793              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
794              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
795
796         /*
797          * Calculate scan IE length -- we need this to alloc
798          * memory and to subtract from the driver limit. It
799          * includes the DS Params, (extended) supported rates, and HT
800          * information -- SSID is the driver's responsibility.
801          */
802         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
803                 3 /* DS Params */;
804         if (supp_ht)
805                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806
807         if (!local->ops->hw_scan) {
808                 /* For hw_scan, driver needs to set these up. */
809                 local->hw.wiphy->max_scan_ssids = 4;
810                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811         }
812
813         /*
814          * If the driver supports any scan IEs, then assume the
815          * limit includes the IEs mac80211 will add, otherwise
816          * leave it at zero and let the driver sort it out; we
817          * still pass our IEs to the driver but userspace will
818          * not be allowed to in that case.
819          */
820         if (local->hw.wiphy->max_scan_ie_len)
821                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822
823         /* Set up cipher suites unless driver already did */
824         if (!local->hw.wiphy->cipher_suites) {
825                 local->hw.wiphy->cipher_suites = cipher_suites;
826                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
827                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
828                         local->hw.wiphy->n_cipher_suites--;
829         }
830         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
831                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
832                         local->hw.wiphy->cipher_suites += 2;
833                         local->hw.wiphy->n_cipher_suites -= 2;
834                 } else {
835                         u32 *suites;
836                         int r, w = 0;
837
838                         /* Filter out WEP */
839
840                         suites = kmemdup(
841                                 local->hw.wiphy->cipher_suites,
842                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
843                                 GFP_KERNEL);
844                         if (!suites)
845                                 return -ENOMEM;
846                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
847                                 u32 suite = local->hw.wiphy->cipher_suites[r];
848                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
849                                     suite == WLAN_CIPHER_SUITE_WEP104)
850                                         continue;
851                                 suites[w++] = suite;
852                         }
853                         local->hw.wiphy->cipher_suites = suites;
854                         local->hw.wiphy->n_cipher_suites = w;
855                         local->wiphy_ciphers_allocated = true;
856                 }
857         }
858
859         if (!local->ops->remain_on_channel)
860                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
861
862         if (local->ops->sched_scan_start)
863                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
864
865         result = wiphy_register(local->hw.wiphy);
866         if (result < 0)
867                 goto fail_wiphy_register;
868
869         /*
870          * We use the number of queues for feature tests (QoS, HT) internally
871          * so restrict them appropriately.
872          */
873         if (hw->queues > IEEE80211_MAX_QUEUES)
874                 hw->queues = IEEE80211_MAX_QUEUES;
875
876         local->workqueue =
877                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
878         if (!local->workqueue) {
879                 result = -ENOMEM;
880                 goto fail_workqueue;
881         }
882
883         /*
884          * The hardware needs headroom for sending the frame,
885          * and we need some headroom for passing the frame to monitor
886          * interfaces, but never both at the same time.
887          */
888 #ifndef __CHECKER__
889         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
890                         sizeof(struct ieee80211_tx_status_rtap_hdr));
891 #endif
892         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
894
895         debugfs_hw_add(local);
896
897         /*
898          * if the driver doesn't specify a max listen interval we
899          * use 5 which should be a safe default
900          */
901         if (local->hw.max_listen_interval == 0)
902                 local->hw.max_listen_interval = 5;
903
904         local->hw.conf.listen_interval = local->hw.max_listen_interval;
905
906         local->dynamic_ps_forced_timeout = -1;
907
908         result = ieee80211_wep_init(local);
909         if (result < 0)
910                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
911                             result);
912
913         rtnl_lock();
914
915         result = ieee80211_init_rate_ctrl_alg(local,
916                                               hw->rate_control_algorithm);
917         if (result < 0) {
918                 wiphy_debug(local->hw.wiphy,
919                             "Failed to initialize rate control algorithm\n");
920                 goto fail_rate;
921         }
922
923         /* add one default STA interface if supported */
924         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
925                 result = ieee80211_if_add(local, "wlan%d", NULL,
926                                           NL80211_IFTYPE_STATION, NULL);
927                 if (result)
928                         wiphy_warn(local->hw.wiphy,
929                                    "Failed to add default virtual iface\n");
930         }
931
932         rtnl_unlock();
933
934         ieee80211_led_init(local);
935
936         local->network_latency_notifier.notifier_call =
937                 ieee80211_max_network_latency;
938         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
939                                      &local->network_latency_notifier);
940         if (result) {
941                 rtnl_lock();
942                 goto fail_pm_qos;
943         }
944
945 #ifdef CONFIG_INET
946         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
947         result = register_inetaddr_notifier(&local->ifa_notifier);
948         if (result)
949                 goto fail_ifa;
950 #endif
951
952         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
953                         local->hw.napi_weight);
954
955         return 0;
956
957 #ifdef CONFIG_INET
958  fail_ifa:
959         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
960                                &local->network_latency_notifier);
961         rtnl_lock();
962 #endif
963  fail_pm_qos:
964         ieee80211_led_exit(local);
965         ieee80211_remove_interfaces(local);
966  fail_rate:
967         rtnl_unlock();
968         ieee80211_wep_free(local);
969         sta_info_stop(local);
970         destroy_workqueue(local->workqueue);
971  fail_workqueue:
972         wiphy_unregister(local->hw.wiphy);
973  fail_wiphy_register:
974         if (local->wiphy_ciphers_allocated)
975                 kfree(local->hw.wiphy->cipher_suites);
976         kfree(local->int_scan_req);
977         return result;
978 }
979 EXPORT_SYMBOL(ieee80211_register_hw);
980
981 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
982 {
983         struct ieee80211_local *local = hw_to_local(hw);
984
985         tasklet_kill(&local->tx_pending_tasklet);
986         tasklet_kill(&local->tasklet);
987
988         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
989                                &local->network_latency_notifier);
990 #ifdef CONFIG_INET
991         unregister_inetaddr_notifier(&local->ifa_notifier);
992 #endif
993
994         rtnl_lock();
995
996         /*
997          * At this point, interface list manipulations are fine
998          * because the driver cannot be handing us frames any
999          * more and the tasklet is killed.
1000          */
1001         ieee80211_remove_interfaces(local);
1002
1003         rtnl_unlock();
1004
1005         /*
1006          * Now all work items will be gone, but the
1007          * timer might still be armed, so delete it
1008          */
1009         del_timer_sync(&local->work_timer);
1010
1011         cancel_work_sync(&local->restart_work);
1012         cancel_work_sync(&local->reconfig_filter);
1013
1014         ieee80211_clear_tx_pending(local);
1015         rate_control_deinitialize(local);
1016
1017         if (skb_queue_len(&local->skb_queue) ||
1018             skb_queue_len(&local->skb_queue_unreliable))
1019                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1020         skb_queue_purge(&local->skb_queue);
1021         skb_queue_purge(&local->skb_queue_unreliable);
1022         skb_queue_purge(&local->rx_skb_queue);
1023
1024         destroy_workqueue(local->workqueue);
1025         wiphy_unregister(local->hw.wiphy);
1026         sta_info_stop(local);
1027         ieee80211_wep_free(local);
1028         ieee80211_led_exit(local);
1029         kfree(local->int_scan_req);
1030 }
1031 EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033 void ieee80211_free_hw(struct ieee80211_hw *hw)
1034 {
1035         struct ieee80211_local *local = hw_to_local(hw);
1036
1037         mutex_destroy(&local->iflist_mtx);
1038         mutex_destroy(&local->mtx);
1039
1040         if (local->wiphy_ciphers_allocated)
1041                 kfree(local->hw.wiphy->cipher_suites);
1042
1043         wiphy_free(local->hw.wiphy);
1044 }
1045 EXPORT_SYMBOL(ieee80211_free_hw);
1046
1047 static int __init ieee80211_init(void)
1048 {
1049         struct sk_buff *skb;
1050         int ret;
1051
1052         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1053         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1054                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1055
1056         ret = rc80211_minstrel_init();
1057         if (ret)
1058                 return ret;
1059
1060         ret = rc80211_minstrel_ht_init();
1061         if (ret)
1062                 goto err_minstrel;
1063
1064         ret = rc80211_pid_init();
1065         if (ret)
1066                 goto err_pid;
1067
1068         ret = ieee80211_iface_init();
1069         if (ret)
1070                 goto err_netdev;
1071
1072         return 0;
1073  err_netdev:
1074         rc80211_pid_exit();
1075  err_pid:
1076         rc80211_minstrel_ht_exit();
1077  err_minstrel:
1078         rc80211_minstrel_exit();
1079
1080         return ret;
1081 }
1082
1083 static void __exit ieee80211_exit(void)
1084 {
1085         rc80211_pid_exit();
1086         rc80211_minstrel_ht_exit();
1087         rc80211_minstrel_exit();
1088
1089         if (mesh_allocated)
1090                 ieee80211s_stop();
1091
1092         ieee80211_iface_exit();
1093
1094         rcu_barrier();
1095 }
1096
1097
1098 subsys_initcall(ieee80211_init);
1099 module_exit(ieee80211_exit);
1100
1101 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1102 MODULE_LICENSE("GPL");