mac80211: add support for HW scheduled scan
[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         sta_info_init(local);
656
657         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
658                 skb_queue_head_init(&local->pending[i]);
659                 atomic_set(&local->agg_queue_stop[i], 0);
660         }
661         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
662                      (unsigned long)local);
663
664         tasklet_init(&local->tasklet,
665                      ieee80211_tasklet_handler,
666                      (unsigned long) local);
667
668         skb_queue_head_init(&local->skb_queue);
669         skb_queue_head_init(&local->skb_queue_unreliable);
670
671         /* init dummy netdev for use w/ NAPI */
672         init_dummy_netdev(&local->napi_dev);
673
674         ieee80211_led_names(local);
675
676         ieee80211_hw_roc_setup(local);
677
678         return local_to_hw(local);
679 }
680 EXPORT_SYMBOL(ieee80211_alloc_hw);
681
682 int ieee80211_register_hw(struct ieee80211_hw *hw)
683 {
684         struct ieee80211_local *local = hw_to_local(hw);
685         int result;
686         enum ieee80211_band band;
687         int channels, max_bitrates;
688         bool supp_ht;
689         static const u32 cipher_suites[] = {
690                 /* keep WEP first, it may be removed below */
691                 WLAN_CIPHER_SUITE_WEP40,
692                 WLAN_CIPHER_SUITE_WEP104,
693                 WLAN_CIPHER_SUITE_TKIP,
694                 WLAN_CIPHER_SUITE_CCMP,
695
696                 /* keep last -- depends on hw flags! */
697                 WLAN_CIPHER_SUITE_AES_CMAC
698         };
699
700         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
701 #ifdef CONFIG_PM
702             && (!local->ops->suspend || !local->ops->resume)
703 #endif
704             )
705                 return -EINVAL;
706
707         if (hw->max_report_rates == 0)
708                 hw->max_report_rates = hw->max_rates;
709
710         /*
711          * generic code guarantees at least one band,
712          * set this very early because much code assumes
713          * that hw.conf.channel is assigned
714          */
715         channels = 0;
716         max_bitrates = 0;
717         supp_ht = false;
718         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
719                 struct ieee80211_supported_band *sband;
720
721                 sband = local->hw.wiphy->bands[band];
722                 if (!sband)
723                         continue;
724                 if (!local->oper_channel) {
725                         /* init channel we're on */
726                         local->hw.conf.channel =
727                         local->oper_channel = &sband->channels[0];
728                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
729                 }
730                 channels += sband->n_channels;
731
732                 if (max_bitrates < sband->n_bitrates)
733                         max_bitrates = sband->n_bitrates;
734                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
735         }
736
737         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
738                                       sizeof(void *) * channels, GFP_KERNEL);
739         if (!local->int_scan_req)
740                 return -ENOMEM;
741
742         /* if low-level driver supports AP, we also support VLAN */
743         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
744                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
745
746         /* mac80211 always supports monitor */
747         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
748
749 #ifndef CONFIG_MAC80211_MESH
750         /* mesh depends on Kconfig, but drivers should set it if they want */
751         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
752 #endif
753
754         /* if the underlying driver supports mesh, mac80211 will (at least)
755          * provide routing of mesh authentication frames to userspace */
756         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
757                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
758
759         /* mac80211 supports control port protocol changing */
760         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
761
762         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
763                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
764         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
765                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
766
767         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
768              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
769              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
770
771         /*
772          * Calculate scan IE length -- we need this to alloc
773          * memory and to subtract from the driver limit. It
774          * includes the DS Params, (extended) supported rates, and HT
775          * information -- SSID is the driver's responsibility.
776          */
777         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
778                 3 /* DS Params */;
779         if (supp_ht)
780                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
781
782         if (!local->ops->hw_scan) {
783                 /* For hw_scan, driver needs to set these up. */
784                 local->hw.wiphy->max_scan_ssids = 4;
785                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
786         }
787
788         /*
789          * If the driver supports any scan IEs, then assume the
790          * limit includes the IEs mac80211 will add, otherwise
791          * leave it at zero and let the driver sort it out; we
792          * still pass our IEs to the driver but userspace will
793          * not be allowed to in that case.
794          */
795         if (local->hw.wiphy->max_scan_ie_len)
796                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
797
798         /* Set up cipher suites unless driver already did */
799         if (!local->hw.wiphy->cipher_suites) {
800                 local->hw.wiphy->cipher_suites = cipher_suites;
801                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
802                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
803                         local->hw.wiphy->n_cipher_suites--;
804         }
805         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
806                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
807                         local->hw.wiphy->cipher_suites += 2;
808                         local->hw.wiphy->n_cipher_suites -= 2;
809                 } else {
810                         u32 *suites;
811                         int r, w = 0;
812
813                         /* Filter out WEP */
814
815                         suites = kmemdup(
816                                 local->hw.wiphy->cipher_suites,
817                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
818                                 GFP_KERNEL);
819                         if (!suites)
820                                 return -ENOMEM;
821                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
822                                 u32 suite = local->hw.wiphy->cipher_suites[r];
823                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
824                                     suite == WLAN_CIPHER_SUITE_WEP104)
825                                         continue;
826                                 suites[w++] = suite;
827                         }
828                         local->hw.wiphy->cipher_suites = suites;
829                         local->hw.wiphy->n_cipher_suites = w;
830                         local->wiphy_ciphers_allocated = true;
831                 }
832         }
833
834         if (!local->ops->remain_on_channel)
835                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
836
837         if (local->ops->sched_scan_start)
838                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
839
840         result = wiphy_register(local->hw.wiphy);
841         if (result < 0)
842                 goto fail_wiphy_register;
843
844         /*
845          * We use the number of queues for feature tests (QoS, HT) internally
846          * so restrict them appropriately.
847          */
848         if (hw->queues > IEEE80211_MAX_QUEUES)
849                 hw->queues = IEEE80211_MAX_QUEUES;
850
851         local->workqueue =
852                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
853         if (!local->workqueue) {
854                 result = -ENOMEM;
855                 goto fail_workqueue;
856         }
857
858         /*
859          * The hardware needs headroom for sending the frame,
860          * and we need some headroom for passing the frame to monitor
861          * interfaces, but never both at the same time.
862          */
863         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
864                         sizeof(struct ieee80211_tx_status_rtap_hdr));
865         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
866                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
867
868         debugfs_hw_add(local);
869
870         /*
871          * if the driver doesn't specify a max listen interval we
872          * use 5 which should be a safe default
873          */
874         if (local->hw.max_listen_interval == 0)
875                 local->hw.max_listen_interval = 5;
876
877         local->hw.conf.listen_interval = local->hw.max_listen_interval;
878
879         local->dynamic_ps_forced_timeout = -1;
880
881         result = ieee80211_wep_init(local);
882         if (result < 0)
883                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
884                             result);
885
886         rtnl_lock();
887
888         result = ieee80211_init_rate_ctrl_alg(local,
889                                               hw->rate_control_algorithm);
890         if (result < 0) {
891                 wiphy_debug(local->hw.wiphy,
892                             "Failed to initialize rate control algorithm\n");
893                 goto fail_rate;
894         }
895
896         /* add one default STA interface if supported */
897         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
898                 result = ieee80211_if_add(local, "wlan%d", NULL,
899                                           NL80211_IFTYPE_STATION, NULL);
900                 if (result)
901                         wiphy_warn(local->hw.wiphy,
902                                    "Failed to add default virtual iface\n");
903         }
904
905         rtnl_unlock();
906
907         ieee80211_led_init(local);
908
909         local->network_latency_notifier.notifier_call =
910                 ieee80211_max_network_latency;
911         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
912                                      &local->network_latency_notifier);
913         if (result) {
914                 rtnl_lock();
915                 goto fail_pm_qos;
916         }
917
918 #ifdef CONFIG_INET
919         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
920         result = register_inetaddr_notifier(&local->ifa_notifier);
921         if (result)
922                 goto fail_ifa;
923 #endif
924
925         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
926                         local->hw.napi_weight);
927
928         return 0;
929
930 #ifdef CONFIG_INET
931  fail_ifa:
932         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
933                                &local->network_latency_notifier);
934         rtnl_lock();
935 #endif
936  fail_pm_qos:
937         ieee80211_led_exit(local);
938         ieee80211_remove_interfaces(local);
939  fail_rate:
940         rtnl_unlock();
941         ieee80211_wep_free(local);
942         sta_info_stop(local);
943         destroy_workqueue(local->workqueue);
944  fail_workqueue:
945         wiphy_unregister(local->hw.wiphy);
946  fail_wiphy_register:
947         if (local->wiphy_ciphers_allocated)
948                 kfree(local->hw.wiphy->cipher_suites);
949         kfree(local->int_scan_req);
950         return result;
951 }
952 EXPORT_SYMBOL(ieee80211_register_hw);
953
954 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
955 {
956         struct ieee80211_local *local = hw_to_local(hw);
957
958         tasklet_kill(&local->tx_pending_tasklet);
959         tasklet_kill(&local->tasklet);
960
961         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
962                                &local->network_latency_notifier);
963 #ifdef CONFIG_INET
964         unregister_inetaddr_notifier(&local->ifa_notifier);
965 #endif
966
967         rtnl_lock();
968
969         /*
970          * At this point, interface list manipulations are fine
971          * because the driver cannot be handing us frames any
972          * more and the tasklet is killed.
973          */
974         ieee80211_remove_interfaces(local);
975
976         rtnl_unlock();
977
978         /*
979          * Now all work items will be gone, but the
980          * timer might still be armed, so delete it
981          */
982         del_timer_sync(&local->work_timer);
983
984         cancel_work_sync(&local->restart_work);
985         cancel_work_sync(&local->reconfig_filter);
986
987         ieee80211_clear_tx_pending(local);
988         sta_info_stop(local);
989         rate_control_deinitialize(local);
990
991         if (skb_queue_len(&local->skb_queue) ||
992             skb_queue_len(&local->skb_queue_unreliable))
993                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
994         skb_queue_purge(&local->skb_queue);
995         skb_queue_purge(&local->skb_queue_unreliable);
996         skb_queue_purge(&local->rx_skb_queue);
997
998         destroy_workqueue(local->workqueue);
999         wiphy_unregister(local->hw.wiphy);
1000         ieee80211_wep_free(local);
1001         ieee80211_led_exit(local);
1002         kfree(local->int_scan_req);
1003 }
1004 EXPORT_SYMBOL(ieee80211_unregister_hw);
1005
1006 void ieee80211_free_hw(struct ieee80211_hw *hw)
1007 {
1008         struct ieee80211_local *local = hw_to_local(hw);
1009
1010         mutex_destroy(&local->iflist_mtx);
1011         mutex_destroy(&local->mtx);
1012
1013         if (local->wiphy_ciphers_allocated)
1014                 kfree(local->hw.wiphy->cipher_suites);
1015
1016         wiphy_free(local->hw.wiphy);
1017 }
1018 EXPORT_SYMBOL(ieee80211_free_hw);
1019
1020 static int __init ieee80211_init(void)
1021 {
1022         struct sk_buff *skb;
1023         int ret;
1024
1025         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1026         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1027                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1028
1029         ret = rc80211_minstrel_init();
1030         if (ret)
1031                 return ret;
1032
1033         ret = rc80211_minstrel_ht_init();
1034         if (ret)
1035                 goto err_minstrel;
1036
1037         ret = rc80211_pid_init();
1038         if (ret)
1039                 goto err_pid;
1040
1041         ret = ieee80211_iface_init();
1042         if (ret)
1043                 goto err_netdev;
1044
1045         return 0;
1046  err_netdev:
1047         rc80211_pid_exit();
1048  err_pid:
1049         rc80211_minstrel_ht_exit();
1050  err_minstrel:
1051         rc80211_minstrel_exit();
1052
1053         return ret;
1054 }
1055
1056 static void __exit ieee80211_exit(void)
1057 {
1058         rc80211_pid_exit();
1059         rc80211_minstrel_ht_exit();
1060         rc80211_minstrel_exit();
1061
1062         if (mesh_allocated)
1063                 ieee80211s_stop();
1064
1065         ieee80211_iface_exit();
1066 }
1067
1068
1069 subsys_initcall(ieee80211_init);
1070 module_exit(ieee80211_exit);
1071
1072 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1073 MODULE_LICENSE("GPL");