mac80211: add basic support for WoWLAN
[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                 "%s called with hardware scan in progress\n", __func__);
363         mutex_unlock(&local->mtx);
364
365         rtnl_lock();
366         ieee80211_scan_cancel(local);
367         ieee80211_reconfig(local);
368         rtnl_unlock();
369 }
370
371 void ieee80211_restart_hw(struct ieee80211_hw *hw)
372 {
373         struct ieee80211_local *local = hw_to_local(hw);
374
375         trace_api_restart_hw(local);
376
377         wiphy_info(hw->wiphy,
378                    "Hardware restart was requested\n");
379
380         /* use this reason, ieee80211_reconfig will unblock it */
381         ieee80211_stop_queues_by_reason(hw,
382                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
383
384         schedule_work(&local->restart_work);
385 }
386 EXPORT_SYMBOL(ieee80211_restart_hw);
387
388 static void ieee80211_recalc_smps_work(struct work_struct *work)
389 {
390         struct ieee80211_local *local =
391                 container_of(work, struct ieee80211_local, recalc_smps);
392
393         mutex_lock(&local->iflist_mtx);
394         ieee80211_recalc_smps(local);
395         mutex_unlock(&local->iflist_mtx);
396 }
397
398 #ifdef CONFIG_INET
399 static int ieee80211_ifa_changed(struct notifier_block *nb,
400                                  unsigned long data, void *arg)
401 {
402         struct in_ifaddr *ifa = arg;
403         struct ieee80211_local *local =
404                 container_of(nb, struct ieee80211_local,
405                              ifa_notifier);
406         struct net_device *ndev = ifa->ifa_dev->dev;
407         struct wireless_dev *wdev = ndev->ieee80211_ptr;
408         struct in_device *idev;
409         struct ieee80211_sub_if_data *sdata;
410         struct ieee80211_bss_conf *bss_conf;
411         struct ieee80211_if_managed *ifmgd;
412         int c = 0;
413
414         /* Make sure it's our interface that got changed */
415         if (!wdev)
416                 return NOTIFY_DONE;
417
418         if (wdev->wiphy != local->hw.wiphy)
419                 return NOTIFY_DONE;
420
421         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
422         bss_conf = &sdata->vif.bss_conf;
423
424         if (!ieee80211_sdata_running(sdata))
425                 return NOTIFY_DONE;
426
427         /* ARP filtering is only supported in managed mode */
428         if (sdata->vif.type != NL80211_IFTYPE_STATION)
429                 return NOTIFY_DONE;
430
431         idev = __in_dev_get_rtnl(sdata->dev);
432         if (!idev)
433                 return NOTIFY_DONE;
434
435         ifmgd = &sdata->u.mgd;
436         mutex_lock(&ifmgd->mtx);
437
438         /* Copy the addresses to the bss_conf list */
439         ifa = idev->ifa_list;
440         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
441                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
442                 ifa = ifa->ifa_next;
443                 c++;
444         }
445
446         /* If not all addresses fit the list, disable filtering */
447         if (ifa) {
448                 sdata->arp_filter_state = false;
449                 c = 0;
450         } else {
451                 sdata->arp_filter_state = true;
452         }
453         bss_conf->arp_addr_cnt = c;
454
455         /* Configure driver only if associated */
456         if (ifmgd->associated) {
457                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
458                 ieee80211_bss_info_change_notify(sdata,
459                                                  BSS_CHANGED_ARP_FILTER);
460         }
461
462         mutex_unlock(&ifmgd->mtx);
463
464         return NOTIFY_DONE;
465 }
466 #endif
467
468 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
469 {
470         struct ieee80211_local *local =
471                 container_of(napi, struct ieee80211_local, napi);
472
473         return local->ops->napi_poll(&local->hw, budget);
474 }
475
476 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
477 {
478         struct ieee80211_local *local = hw_to_local(hw);
479
480         napi_schedule(&local->napi);
481 }
482 EXPORT_SYMBOL(ieee80211_napi_schedule);
483
484 void ieee80211_napi_complete(struct ieee80211_hw *hw)
485 {
486         struct ieee80211_local *local = hw_to_local(hw);
487
488         napi_complete(&local->napi);
489 }
490 EXPORT_SYMBOL(ieee80211_napi_complete);
491
492 /* There isn't a lot of sense in it, but you can transmit anything you like */
493 static const struct ieee80211_txrx_stypes
494 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
495         [NL80211_IFTYPE_ADHOC] = {
496                 .tx = 0xffff,
497                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
498         },
499         [NL80211_IFTYPE_STATION] = {
500                 .tx = 0xffff,
501                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
502                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
503         },
504         [NL80211_IFTYPE_AP] = {
505                 .tx = 0xffff,
506                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
507                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
508                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
509                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
510                         BIT(IEEE80211_STYPE_AUTH >> 4) |
511                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
512                         BIT(IEEE80211_STYPE_ACTION >> 4),
513         },
514         [NL80211_IFTYPE_AP_VLAN] = {
515                 /* copy AP */
516                 .tx = 0xffff,
517                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
518                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
519                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
520                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
521                         BIT(IEEE80211_STYPE_AUTH >> 4) |
522                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
523                         BIT(IEEE80211_STYPE_ACTION >> 4),
524         },
525         [NL80211_IFTYPE_P2P_CLIENT] = {
526                 .tx = 0xffff,
527                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
528                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
529         },
530         [NL80211_IFTYPE_P2P_GO] = {
531                 .tx = 0xffff,
532                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
533                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
534                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
535                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
536                         BIT(IEEE80211_STYPE_AUTH >> 4) |
537                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
538                         BIT(IEEE80211_STYPE_ACTION >> 4),
539         },
540         [NL80211_IFTYPE_MESH_POINT] = {
541                 .tx = 0xffff,
542                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
543                         BIT(IEEE80211_STYPE_AUTH >> 4) |
544                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
545         },
546 };
547
548 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
549                                         const struct ieee80211_ops *ops)
550 {
551         struct ieee80211_local *local;
552         int priv_size, i;
553         struct wiphy *wiphy;
554
555         /* Ensure 32-byte alignment of our private data and hw private data.
556          * We use the wiphy priv data for both our ieee80211_local and for
557          * the driver's private data
558          *
559          * In memory it'll be like this:
560          *
561          * +-------------------------+
562          * | struct wiphy           |
563          * +-------------------------+
564          * | struct ieee80211_local  |
565          * +-------------------------+
566          * | driver's private data   |
567          * +-------------------------+
568          *
569          */
570         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
571
572         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
573
574         if (!wiphy)
575                 return NULL;
576
577         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
578
579         wiphy->privid = mac80211_wiphy_privid;
580
581         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
582                         WIPHY_FLAG_4ADDR_AP |
583                         WIPHY_FLAG_4ADDR_STATION;
584
585         if (!ops->set_key)
586                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
587
588         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
589
590         local = wiphy_priv(wiphy);
591
592         local->hw.wiphy = wiphy;
593
594         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
595
596         BUG_ON(!ops->tx);
597         BUG_ON(!ops->start);
598         BUG_ON(!ops->stop);
599         BUG_ON(!ops->config);
600         BUG_ON(!ops->add_interface);
601         BUG_ON(!ops->remove_interface);
602         BUG_ON(!ops->configure_filter);
603         local->ops = ops;
604
605         /* set up some defaults */
606         local->hw.queues = 1;
607         local->hw.max_rates = 1;
608         local->hw.max_report_rates = 0;
609         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
610         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
611         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
612         local->user_power_level = -1;
613         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
614         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
615
616         INIT_LIST_HEAD(&local->interfaces);
617
618         __hw_addr_init(&local->mc_list);
619
620         mutex_init(&local->iflist_mtx);
621         mutex_init(&local->mtx);
622
623         mutex_init(&local->key_mtx);
624         spin_lock_init(&local->filter_lock);
625         spin_lock_init(&local->queue_stop_reason_lock);
626
627         /*
628          * The rx_skb_queue is only accessed from tasklets,
629          * but other SKB queues are used from within IRQ
630          * context. Therefore, this one needs a different
631          * locking class so our direct, non-irq-safe use of
632          * the queue's lock doesn't throw lockdep warnings.
633          */
634         skb_queue_head_init_class(&local->rx_skb_queue,
635                                   &ieee80211_rx_skb_queue_class);
636
637         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
638
639         ieee80211_work_init(local);
640
641         INIT_WORK(&local->restart_work, ieee80211_restart_work);
642
643         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
644         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
645         local->smps_mode = IEEE80211_SMPS_OFF;
646
647         INIT_WORK(&local->dynamic_ps_enable_work,
648                   ieee80211_dynamic_ps_enable_work);
649         INIT_WORK(&local->dynamic_ps_disable_work,
650                   ieee80211_dynamic_ps_disable_work);
651         setup_timer(&local->dynamic_ps_timer,
652                     ieee80211_dynamic_ps_timer, (unsigned long) local);
653
654         sta_info_init(local);
655
656         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
657                 skb_queue_head_init(&local->pending[i]);
658                 atomic_set(&local->agg_queue_stop[i], 0);
659         }
660         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
661                      (unsigned long)local);
662
663         tasklet_init(&local->tasklet,
664                      ieee80211_tasklet_handler,
665                      (unsigned long) local);
666
667         skb_queue_head_init(&local->skb_queue);
668         skb_queue_head_init(&local->skb_queue_unreliable);
669
670         /* init dummy netdev for use w/ NAPI */
671         init_dummy_netdev(&local->napi_dev);
672
673         ieee80211_led_names(local);
674
675         ieee80211_hw_roc_setup(local);
676
677         return local_to_hw(local);
678 }
679 EXPORT_SYMBOL(ieee80211_alloc_hw);
680
681 int ieee80211_register_hw(struct ieee80211_hw *hw)
682 {
683         struct ieee80211_local *local = hw_to_local(hw);
684         int result;
685         enum ieee80211_band band;
686         int channels, max_bitrates;
687         bool supp_ht;
688         static const u32 cipher_suites[] = {
689                 /* keep WEP first, it may be removed below */
690                 WLAN_CIPHER_SUITE_WEP40,
691                 WLAN_CIPHER_SUITE_WEP104,
692                 WLAN_CIPHER_SUITE_TKIP,
693                 WLAN_CIPHER_SUITE_CCMP,
694
695                 /* keep last -- depends on hw flags! */
696                 WLAN_CIPHER_SUITE_AES_CMAC
697         };
698
699         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
700             (!local->ops->suspend || !local->ops->resume))
701                 return -EINVAL;
702
703         if (hw->max_report_rates == 0)
704                 hw->max_report_rates = hw->max_rates;
705
706         /*
707          * generic code guarantees at least one band,
708          * set this very early because much code assumes
709          * that hw.conf.channel is assigned
710          */
711         channels = 0;
712         max_bitrates = 0;
713         supp_ht = false;
714         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
715                 struct ieee80211_supported_band *sband;
716
717                 sband = local->hw.wiphy->bands[band];
718                 if (!sband)
719                         continue;
720                 if (!local->oper_channel) {
721                         /* init channel we're on */
722                         local->hw.conf.channel =
723                         local->oper_channel = &sband->channels[0];
724                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
725                 }
726                 channels += sband->n_channels;
727
728                 if (max_bitrates < sband->n_bitrates)
729                         max_bitrates = sband->n_bitrates;
730                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
731         }
732
733         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
734                                       sizeof(void *) * channels, GFP_KERNEL);
735         if (!local->int_scan_req)
736                 return -ENOMEM;
737
738         /* if low-level driver supports AP, we also support VLAN */
739         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
740                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
741
742         /* mac80211 always supports monitor */
743         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
744
745 #ifndef CONFIG_MAC80211_MESH
746         /* mesh depends on Kconfig, but drivers should set it if they want */
747         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
748 #endif
749
750         /* if the underlying driver supports mesh, mac80211 will (at least)
751          * provide routing of mesh authentication frames to userspace */
752         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
753                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
754
755         /* mac80211 supports control port protocol changing */
756         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
757
758         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
759                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
760         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
761                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
762
763         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
764              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
765              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
766
767         /*
768          * Calculate scan IE length -- we need this to alloc
769          * memory and to subtract from the driver limit. It
770          * includes the DS Params, (extended) supported rates, and HT
771          * information -- SSID is the driver's responsibility.
772          */
773         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
774                 3 /* DS Params */;
775         if (supp_ht)
776                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
777
778         if (!local->ops->hw_scan) {
779                 /* For hw_scan, driver needs to set these up. */
780                 local->hw.wiphy->max_scan_ssids = 4;
781                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
782         }
783
784         /*
785          * If the driver supports any scan IEs, then assume the
786          * limit includes the IEs mac80211 will add, otherwise
787          * leave it at zero and let the driver sort it out; we
788          * still pass our IEs to the driver but userspace will
789          * not be allowed to in that case.
790          */
791         if (local->hw.wiphy->max_scan_ie_len)
792                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
793
794         /* Set up cipher suites unless driver already did */
795         if (!local->hw.wiphy->cipher_suites) {
796                 local->hw.wiphy->cipher_suites = cipher_suites;
797                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
798                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
799                         local->hw.wiphy->n_cipher_suites--;
800         }
801         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
802                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
803                         local->hw.wiphy->cipher_suites += 2;
804                         local->hw.wiphy->n_cipher_suites -= 2;
805                 } else {
806                         u32 *suites;
807                         int r, w = 0;
808
809                         /* Filter out WEP */
810
811                         suites = kmemdup(
812                                 local->hw.wiphy->cipher_suites,
813                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
814                                 GFP_KERNEL);
815                         if (!suites)
816                                 return -ENOMEM;
817                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
818                                 u32 suite = local->hw.wiphy->cipher_suites[r];
819                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
820                                     suite == WLAN_CIPHER_SUITE_WEP104)
821                                         continue;
822                                 suites[w++] = suite;
823                         }
824                         local->hw.wiphy->cipher_suites = suites;
825                         local->hw.wiphy->n_cipher_suites = w;
826                         local->wiphy_ciphers_allocated = true;
827                 }
828         }
829
830         if (!local->ops->remain_on_channel)
831                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
832
833         result = wiphy_register(local->hw.wiphy);
834         if (result < 0)
835                 goto fail_wiphy_register;
836
837         /*
838          * We use the number of queues for feature tests (QoS, HT) internally
839          * so restrict them appropriately.
840          */
841         if (hw->queues > IEEE80211_MAX_QUEUES)
842                 hw->queues = IEEE80211_MAX_QUEUES;
843
844         local->workqueue =
845                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
846         if (!local->workqueue) {
847                 result = -ENOMEM;
848                 goto fail_workqueue;
849         }
850
851         /*
852          * The hardware needs headroom for sending the frame,
853          * and we need some headroom for passing the frame to monitor
854          * interfaces, but never both at the same time.
855          */
856         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
857                         sizeof(struct ieee80211_tx_status_rtap_hdr));
858         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
859                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
860
861         debugfs_hw_add(local);
862
863         /*
864          * if the driver doesn't specify a max listen interval we
865          * use 5 which should be a safe default
866          */
867         if (local->hw.max_listen_interval == 0)
868                 local->hw.max_listen_interval = 5;
869
870         local->hw.conf.listen_interval = local->hw.max_listen_interval;
871
872         local->dynamic_ps_forced_timeout = -1;
873
874         result = ieee80211_wep_init(local);
875         if (result < 0)
876                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
877                             result);
878
879         rtnl_lock();
880
881         result = ieee80211_init_rate_ctrl_alg(local,
882                                               hw->rate_control_algorithm);
883         if (result < 0) {
884                 wiphy_debug(local->hw.wiphy,
885                             "Failed to initialize rate control algorithm\n");
886                 goto fail_rate;
887         }
888
889         /* add one default STA interface if supported */
890         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
891                 result = ieee80211_if_add(local, "wlan%d", NULL,
892                                           NL80211_IFTYPE_STATION, NULL);
893                 if (result)
894                         wiphy_warn(local->hw.wiphy,
895                                    "Failed to add default virtual iface\n");
896         }
897
898         rtnl_unlock();
899
900         ieee80211_led_init(local);
901
902         local->network_latency_notifier.notifier_call =
903                 ieee80211_max_network_latency;
904         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
905                                      &local->network_latency_notifier);
906         if (result) {
907                 rtnl_lock();
908                 goto fail_pm_qos;
909         }
910
911 #ifdef CONFIG_INET
912         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
913         result = register_inetaddr_notifier(&local->ifa_notifier);
914         if (result)
915                 goto fail_ifa;
916 #endif
917
918         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
919                         local->hw.napi_weight);
920
921         return 0;
922
923 #ifdef CONFIG_INET
924  fail_ifa:
925         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
926                                &local->network_latency_notifier);
927         rtnl_lock();
928 #endif
929  fail_pm_qos:
930         ieee80211_led_exit(local);
931         ieee80211_remove_interfaces(local);
932  fail_rate:
933         rtnl_unlock();
934         ieee80211_wep_free(local);
935         sta_info_stop(local);
936         destroy_workqueue(local->workqueue);
937  fail_workqueue:
938         wiphy_unregister(local->hw.wiphy);
939  fail_wiphy_register:
940         if (local->wiphy_ciphers_allocated)
941                 kfree(local->hw.wiphy->cipher_suites);
942         kfree(local->int_scan_req);
943         return result;
944 }
945 EXPORT_SYMBOL(ieee80211_register_hw);
946
947 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
948 {
949         struct ieee80211_local *local = hw_to_local(hw);
950
951         tasklet_kill(&local->tx_pending_tasklet);
952         tasklet_kill(&local->tasklet);
953
954         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
955                                &local->network_latency_notifier);
956 #ifdef CONFIG_INET
957         unregister_inetaddr_notifier(&local->ifa_notifier);
958 #endif
959
960         rtnl_lock();
961
962         /*
963          * At this point, interface list manipulations are fine
964          * because the driver cannot be handing us frames any
965          * more and the tasklet is killed.
966          */
967         ieee80211_remove_interfaces(local);
968
969         rtnl_unlock();
970
971         /*
972          * Now all work items will be gone, but the
973          * timer might still be armed, so delete it
974          */
975         del_timer_sync(&local->work_timer);
976
977         cancel_work_sync(&local->restart_work);
978         cancel_work_sync(&local->reconfig_filter);
979
980         ieee80211_clear_tx_pending(local);
981         sta_info_stop(local);
982         rate_control_deinitialize(local);
983
984         if (skb_queue_len(&local->skb_queue) ||
985             skb_queue_len(&local->skb_queue_unreliable))
986                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
987         skb_queue_purge(&local->skb_queue);
988         skb_queue_purge(&local->skb_queue_unreliable);
989         skb_queue_purge(&local->rx_skb_queue);
990
991         destroy_workqueue(local->workqueue);
992         wiphy_unregister(local->hw.wiphy);
993         ieee80211_wep_free(local);
994         ieee80211_led_exit(local);
995         kfree(local->int_scan_req);
996 }
997 EXPORT_SYMBOL(ieee80211_unregister_hw);
998
999 void ieee80211_free_hw(struct ieee80211_hw *hw)
1000 {
1001         struct ieee80211_local *local = hw_to_local(hw);
1002
1003         mutex_destroy(&local->iflist_mtx);
1004         mutex_destroy(&local->mtx);
1005
1006         if (local->wiphy_ciphers_allocated)
1007                 kfree(local->hw.wiphy->cipher_suites);
1008
1009         wiphy_free(local->hw.wiphy);
1010 }
1011 EXPORT_SYMBOL(ieee80211_free_hw);
1012
1013 static int __init ieee80211_init(void)
1014 {
1015         struct sk_buff *skb;
1016         int ret;
1017
1018         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1019         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1020                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1021
1022         ret = rc80211_minstrel_init();
1023         if (ret)
1024                 return ret;
1025
1026         ret = rc80211_minstrel_ht_init();
1027         if (ret)
1028                 goto err_minstrel;
1029
1030         ret = rc80211_pid_init();
1031         if (ret)
1032                 goto err_pid;
1033
1034         ret = ieee80211_iface_init();
1035         if (ret)
1036                 goto err_netdev;
1037
1038         return 0;
1039  err_netdev:
1040         rc80211_pid_exit();
1041  err_pid:
1042         rc80211_minstrel_ht_exit();
1043  err_minstrel:
1044         rc80211_minstrel_exit();
1045
1046         return ret;
1047 }
1048
1049 static void __exit ieee80211_exit(void)
1050 {
1051         rc80211_pid_exit();
1052         rc80211_minstrel_ht_exit();
1053         rc80211_minstrel_exit();
1054
1055         if (mesh_allocated)
1056                 ieee80211s_stop();
1057
1058         ieee80211_iface_exit();
1059 }
1060
1061
1062 subsys_initcall(ieee80211_init);
1063 module_exit(ieee80211_exit);
1064
1065 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1066 MODULE_LICENSE("GPL");