mac80211: Allow scanning on existing channel-type.
[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
37 bool ieee80211_disable_40mhz_24ghz;
38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40                  "Disable 40MHz support in the 2.4GHz band");
41
42 static struct lock_class_key ieee80211_rx_skb_queue_class;
43
44 void ieee80211_configure_filter(struct ieee80211_local *local)
45 {
46         u64 mc;
47         unsigned int changed_flags;
48         unsigned int new_flags = 0;
49
50         if (atomic_read(&local->iff_promiscs))
51                 new_flags |= FIF_PROMISC_IN_BSS;
52
53         if (atomic_read(&local->iff_allmultis))
54                 new_flags |= FIF_ALLMULTI;
55
56         if (local->monitors || local->scanning)
57                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
58
59         if (local->fif_probe_req || local->probe_req_reg)
60                 new_flags |= FIF_PROBE_REQ;
61
62         if (local->fif_fcsfail)
63                 new_flags |= FIF_FCSFAIL;
64
65         if (local->fif_plcpfail)
66                 new_flags |= FIF_PLCPFAIL;
67
68         if (local->fif_control)
69                 new_flags |= FIF_CONTROL;
70
71         if (local->fif_other_bss)
72                 new_flags |= FIF_OTHER_BSS;
73
74         if (local->fif_pspoll)
75                 new_flags |= FIF_PSPOLL;
76
77         spin_lock_bh(&local->filter_lock);
78         changed_flags = local->filter_flags ^ new_flags;
79
80         mc = drv_prepare_multicast(local, &local->mc_list);
81         spin_unlock_bh(&local->filter_lock);
82
83         /* be a bit nasty */
84         new_flags |= (1<<31);
85
86         drv_configure_filter(local, changed_flags, &new_flags, mc);
87
88         WARN_ON(new_flags & (1<<31));
89
90         local->filter_flags = new_flags & ~(1<<31);
91 }
92
93 static void ieee80211_reconfig_filter(struct work_struct *work)
94 {
95         struct ieee80211_local *local =
96                 container_of(work, struct ieee80211_local, reconfig_filter);
97
98         ieee80211_configure_filter(local);
99 }
100
101 /*
102  * Returns true if we are logically configured to be on
103  * the operating channel AND the hardware-conf is currently
104  * configured on the operating channel.  Compares channel-type
105  * as well.
106  */
107 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
108 {
109         struct ieee80211_channel *chan, *scan_chan;
110         enum nl80211_channel_type channel_type;
111
112         /* This logic needs to match logic in ieee80211_hw_config */
113         if (local->scan_channel) {
114                 chan = local->scan_channel;
115                 /* If scanning on oper channel, use whatever channel-type
116                  * is currently in use.
117                  */
118                 if (chan == local->oper_channel)
119                         channel_type = local->_oper_channel_type;
120                 else
121                         channel_type = NL80211_CHAN_NO_HT;
122         } else if (local->tmp_channel) {
123                 chan = scan_chan = local->tmp_channel;
124                 channel_type = local->tmp_channel_type;
125         } else {
126                 chan = local->oper_channel;
127                 channel_type = local->_oper_channel_type;
128         }
129
130         if (chan != local->oper_channel ||
131             channel_type != local->_oper_channel_type)
132                 return false;
133
134         /* Check current hardware-config against oper_channel. */
135         if ((local->oper_channel != local->hw.conf.channel) ||
136             (local->_oper_channel_type != local->hw.conf.channel_type))
137                 return false;
138
139         return true;
140 }
141
142 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
143 {
144         struct ieee80211_channel *chan, *scan_chan;
145         int ret = 0;
146         int power;
147         enum nl80211_channel_type channel_type;
148         u32 offchannel_flag;
149
150         might_sleep();
151
152         scan_chan = local->scan_channel;
153
154         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
155          * may need to change as well.
156          */
157         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
158         if (scan_chan) {
159                 chan = scan_chan;
160                 /* If scanning on oper channel, use whatever channel-type
161                  * is currently in use.
162                  */
163                 if (chan == local->oper_channel)
164                         channel_type = local->_oper_channel_type;
165                 else
166                         channel_type = NL80211_CHAN_NO_HT;
167         } else if (local->tmp_channel) {
168                 chan = scan_chan = local->tmp_channel;
169                 channel_type = local->tmp_channel_type;
170         } else {
171                 chan = local->oper_channel;
172                 channel_type = local->_oper_channel_type;
173         }
174
175         if (chan != local->oper_channel ||
176             channel_type != local->_oper_channel_type)
177                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
178         else
179                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
180
181         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
182
183         if (offchannel_flag || chan != local->hw.conf.channel ||
184             channel_type != local->hw.conf.channel_type) {
185                 local->hw.conf.channel = chan;
186                 local->hw.conf.channel_type = channel_type;
187                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
188         }
189
190         if (!conf_is_ht(&local->hw.conf)) {
191                 /*
192                  * mac80211.h documents that this is only valid
193                  * when the channel is set to an HT type, and
194                  * that otherwise STATIC is used.
195                  */
196                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
197         } else if (local->hw.conf.smps_mode != local->smps_mode) {
198                 local->hw.conf.smps_mode = local->smps_mode;
199                 changed |= IEEE80211_CONF_CHANGE_SMPS;
200         }
201
202         if (scan_chan)
203                 power = chan->max_power;
204         else
205                 power = local->power_constr_level ?
206                         (chan->max_power - local->power_constr_level) :
207                         chan->max_power;
208
209         if (local->user_power_level >= 0)
210                 power = min(power, local->user_power_level);
211
212         if (local->hw.conf.power_level != power) {
213                 changed |= IEEE80211_CONF_CHANGE_POWER;
214                 local->hw.conf.power_level = power;
215         }
216
217         if (changed && local->open_count) {
218                 ret = drv_config(local, changed);
219                 /*
220                  * Goal:
221                  * HW reconfiguration should never fail, the driver has told
222                  * us what it can support so it should live up to that promise.
223                  *
224                  * Current status:
225                  * rfkill is not integrated with mac80211 and a
226                  * configuration command can thus fail if hardware rfkill
227                  * is enabled
228                  *
229                  * FIXME: integrate rfkill with mac80211 and then add this
230                  * WARN_ON() back
231                  *
232                  */
233                 /* WARN_ON(ret); */
234         }
235
236         return ret;
237 }
238
239 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
240                                       u32 changed)
241 {
242         struct ieee80211_local *local = sdata->local;
243         static const u8 zero[ETH_ALEN] = { 0 };
244
245         if (!changed)
246                 return;
247
248         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
249                 /*
250                  * While not associated, claim a BSSID of all-zeroes
251                  * so that drivers don't do any weird things with the
252                  * BSSID at that time.
253                  */
254                 if (sdata->vif.bss_conf.assoc)
255                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
256                 else
257                         sdata->vif.bss_conf.bssid = zero;
258         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
259                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
260         else if (sdata->vif.type == NL80211_IFTYPE_AP)
261                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
262         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
263                 sdata->vif.bss_conf.bssid = NULL;
264         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
265                 sdata->vif.bss_conf.bssid = zero;
266         } else {
267                 WARN_ON(1);
268                 return;
269         }
270
271         switch (sdata->vif.type) {
272         case NL80211_IFTYPE_AP:
273         case NL80211_IFTYPE_ADHOC:
274         case NL80211_IFTYPE_WDS:
275         case NL80211_IFTYPE_MESH_POINT:
276                 break;
277         default:
278                 /* do not warn to simplify caller in scan.c */
279                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
280                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
281                         return;
282                 break;
283         }
284
285         if (changed & BSS_CHANGED_BEACON_ENABLED) {
286                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
287                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
288                         sdata->vif.bss_conf.enable_beacon = false;
289                 } else {
290                         /*
291                          * Beacon should be enabled, but AP mode must
292                          * check whether there is a beacon configured.
293                          */
294                         switch (sdata->vif.type) {
295                         case NL80211_IFTYPE_AP:
296                                 sdata->vif.bss_conf.enable_beacon =
297                                         !!sdata->u.ap.beacon;
298                                 break;
299                         case NL80211_IFTYPE_ADHOC:
300                                 sdata->vif.bss_conf.enable_beacon =
301                                         !!sdata->u.ibss.presp;
302                                 break;
303 #ifdef CONFIG_MAC80211_MESH
304                         case NL80211_IFTYPE_MESH_POINT:
305                                 sdata->vif.bss_conf.enable_beacon =
306                                         !!sdata->u.mesh.mesh_id_len;
307                                 break;
308 #endif
309                         default:
310                                 /* not reached */
311                                 WARN_ON(1);
312                                 break;
313                         }
314                 }
315         }
316
317         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
318 }
319
320 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
321 {
322         sdata->vif.bss_conf.use_cts_prot = false;
323         sdata->vif.bss_conf.use_short_preamble = false;
324         sdata->vif.bss_conf.use_short_slot = false;
325         return BSS_CHANGED_ERP_CTS_PROT |
326                BSS_CHANGED_ERP_PREAMBLE |
327                BSS_CHANGED_ERP_SLOT;
328 }
329
330 static void ieee80211_tasklet_handler(unsigned long data)
331 {
332         struct ieee80211_local *local = (struct ieee80211_local *) data;
333         struct sk_buff *skb;
334
335         while ((skb = skb_dequeue(&local->skb_queue)) ||
336                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
337                 switch (skb->pkt_type) {
338                 case IEEE80211_RX_MSG:
339                         /* Clear skb->pkt_type in order to not confuse kernel
340                          * netstack. */
341                         skb->pkt_type = 0;
342                         ieee80211_rx(local_to_hw(local), skb);
343                         break;
344                 case IEEE80211_TX_STATUS_MSG:
345                         skb->pkt_type = 0;
346                         ieee80211_tx_status(local_to_hw(local), skb);
347                         break;
348                 default:
349                         WARN(1, "mac80211: Packet is of unknown type %d\n",
350                              skb->pkt_type);
351                         dev_kfree_skb(skb);
352                         break;
353                 }
354         }
355 }
356
357 static void ieee80211_restart_work(struct work_struct *work)
358 {
359         struct ieee80211_local *local =
360                 container_of(work, struct ieee80211_local, restart_work);
361
362         /* wait for scan work complete */
363         flush_workqueue(local->workqueue);
364
365         mutex_lock(&local->mtx);
366         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
367                 "%s called with hardware scan in progress\n", __func__);
368         mutex_unlock(&local->mtx);
369
370         rtnl_lock();
371         ieee80211_scan_cancel(local);
372         ieee80211_reconfig(local);
373         rtnl_unlock();
374 }
375
376 void ieee80211_restart_hw(struct ieee80211_hw *hw)
377 {
378         struct ieee80211_local *local = hw_to_local(hw);
379
380         trace_api_restart_hw(local);
381
382         /* use this reason, ieee80211_reconfig will unblock it */
383         ieee80211_stop_queues_by_reason(hw,
384                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
385
386         schedule_work(&local->restart_work);
387 }
388 EXPORT_SYMBOL(ieee80211_restart_hw);
389
390 static void ieee80211_recalc_smps_work(struct work_struct *work)
391 {
392         struct ieee80211_local *local =
393                 container_of(work, struct ieee80211_local, recalc_smps);
394
395         mutex_lock(&local->iflist_mtx);
396         ieee80211_recalc_smps(local);
397         mutex_unlock(&local->iflist_mtx);
398 }
399
400 #ifdef CONFIG_INET
401 static int ieee80211_ifa_changed(struct notifier_block *nb,
402                                  unsigned long data, void *arg)
403 {
404         struct in_ifaddr *ifa = arg;
405         struct ieee80211_local *local =
406                 container_of(nb, struct ieee80211_local,
407                              ifa_notifier);
408         struct net_device *ndev = ifa->ifa_dev->dev;
409         struct wireless_dev *wdev = ndev->ieee80211_ptr;
410         struct in_device *idev;
411         struct ieee80211_sub_if_data *sdata;
412         struct ieee80211_bss_conf *bss_conf;
413         struct ieee80211_if_managed *ifmgd;
414         int c = 0;
415
416         /* Make sure it's our interface that got changed */
417         if (!wdev)
418                 return NOTIFY_DONE;
419
420         if (wdev->wiphy != local->hw.wiphy)
421                 return NOTIFY_DONE;
422
423         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
424         bss_conf = &sdata->vif.bss_conf;
425
426         if (!ieee80211_sdata_running(sdata))
427                 return NOTIFY_DONE;
428
429         /* ARP filtering is only supported in managed mode */
430         if (sdata->vif.type != NL80211_IFTYPE_STATION)
431                 return NOTIFY_DONE;
432
433         idev = __in_dev_get_rtnl(sdata->dev);
434         if (!idev)
435                 return NOTIFY_DONE;
436
437         ifmgd = &sdata->u.mgd;
438         mutex_lock(&ifmgd->mtx);
439
440         /* Copy the addresses to the bss_conf list */
441         ifa = idev->ifa_list;
442         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
443                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
444                 ifa = ifa->ifa_next;
445                 c++;
446         }
447
448         /* If not all addresses fit the list, disable filtering */
449         if (ifa) {
450                 sdata->arp_filter_state = false;
451                 c = 0;
452         } else {
453                 sdata->arp_filter_state = true;
454         }
455         bss_conf->arp_addr_cnt = c;
456
457         /* Configure driver only if associated */
458         if (ifmgd->associated) {
459                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
460                 ieee80211_bss_info_change_notify(sdata,
461                                                  BSS_CHANGED_ARP_FILTER);
462         }
463
464         mutex_unlock(&ifmgd->mtx);
465
466         return NOTIFY_DONE;
467 }
468 #endif
469
470 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
471 {
472         struct ieee80211_local *local =
473                 container_of(napi, struct ieee80211_local, napi);
474
475         return local->ops->napi_poll(&local->hw, budget);
476 }
477
478 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
479 {
480         struct ieee80211_local *local = hw_to_local(hw);
481
482         napi_schedule(&local->napi);
483 }
484 EXPORT_SYMBOL(ieee80211_napi_schedule);
485
486 void ieee80211_napi_complete(struct ieee80211_hw *hw)
487 {
488         struct ieee80211_local *local = hw_to_local(hw);
489
490         napi_complete(&local->napi);
491 }
492 EXPORT_SYMBOL(ieee80211_napi_complete);
493
494 /* There isn't a lot of sense in it, but you can transmit anything you like */
495 static const struct ieee80211_txrx_stypes
496 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
497         [NL80211_IFTYPE_ADHOC] = {
498                 .tx = 0xffff,
499                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
500         },
501         [NL80211_IFTYPE_STATION] = {
502                 .tx = 0xffff,
503                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
504                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
505         },
506         [NL80211_IFTYPE_AP] = {
507                 .tx = 0xffff,
508                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
509                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
510                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
511                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
512                         BIT(IEEE80211_STYPE_AUTH >> 4) |
513                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
514                         BIT(IEEE80211_STYPE_ACTION >> 4),
515         },
516         [NL80211_IFTYPE_AP_VLAN] = {
517                 /* copy AP */
518                 .tx = 0xffff,
519                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
520                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
521                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
522                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
523                         BIT(IEEE80211_STYPE_AUTH >> 4) |
524                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
525                         BIT(IEEE80211_STYPE_ACTION >> 4),
526         },
527         [NL80211_IFTYPE_P2P_CLIENT] = {
528                 .tx = 0xffff,
529                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
530                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
531         },
532         [NL80211_IFTYPE_P2P_GO] = {
533                 .tx = 0xffff,
534                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
535                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
536                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
537                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
538                         BIT(IEEE80211_STYPE_AUTH >> 4) |
539                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
540                         BIT(IEEE80211_STYPE_ACTION >> 4),
541         },
542         [NL80211_IFTYPE_MESH_POINT] = {
543                 .tx = 0xffff,
544                 .rx = BIT(IEEE80211_STYPE_ACTION >> 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                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
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->max_report_rates == 0)
701                 hw->max_report_rates = hw->max_rates;
702
703         /*
704          * generic code guarantees at least one band,
705          * set this very early because much code assumes
706          * that hw.conf.channel is assigned
707          */
708         channels = 0;
709         max_bitrates = 0;
710         supp_ht = false;
711         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
712                 struct ieee80211_supported_band *sband;
713
714                 sband = local->hw.wiphy->bands[band];
715                 if (!sband)
716                         continue;
717                 if (!local->oper_channel) {
718                         /* init channel we're on */
719                         local->hw.conf.channel =
720                         local->oper_channel = &sband->channels[0];
721                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
722                 }
723                 channels += sband->n_channels;
724
725                 if (max_bitrates < sband->n_bitrates)
726                         max_bitrates = sband->n_bitrates;
727                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
728         }
729
730         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
731                                       sizeof(void *) * channels, GFP_KERNEL);
732         if (!local->int_scan_req)
733                 return -ENOMEM;
734
735         /* if low-level driver supports AP, we also support VLAN */
736         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
737                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
738
739         /* mac80211 always supports monitor */
740         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
741
742 #ifndef CONFIG_MAC80211_MESH
743         /* mesh depends on Kconfig, but drivers should set it if they want */
744         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
745 #endif
746
747         /* mac80211 supports control port protocol changing */
748         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
749
750         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
751                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
752         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
753                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
754
755         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
756              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
757              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
758
759         /*
760          * Calculate scan IE length -- we need this to alloc
761          * memory and to subtract from the driver limit. It
762          * includes the DS Params, (extended) supported rates, and HT
763          * information -- SSID is the driver's responsibility.
764          */
765         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
766                 3 /* DS Params */;
767         if (supp_ht)
768                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
769
770         if (!local->ops->hw_scan) {
771                 /* For hw_scan, driver needs to set these up. */
772                 local->hw.wiphy->max_scan_ssids = 4;
773                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
774         }
775
776         /*
777          * If the driver supports any scan IEs, then assume the
778          * limit includes the IEs mac80211 will add, otherwise
779          * leave it at zero and let the driver sort it out; we
780          * still pass our IEs to the driver but userspace will
781          * not be allowed to in that case.
782          */
783         if (local->hw.wiphy->max_scan_ie_len)
784                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
785
786         /* Set up cipher suites unless driver already did */
787         if (!local->hw.wiphy->cipher_suites) {
788                 local->hw.wiphy->cipher_suites = cipher_suites;
789                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
790                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
791                         local->hw.wiphy->n_cipher_suites--;
792         }
793         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
794                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
795                         local->hw.wiphy->cipher_suites += 2;
796                         local->hw.wiphy->n_cipher_suites -= 2;
797                 } else {
798                         u32 *suites;
799                         int r, w = 0;
800
801                         /* Filter out WEP */
802
803                         suites = kmemdup(
804                                 local->hw.wiphy->cipher_suites,
805                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
806                                 GFP_KERNEL);
807                         if (!suites)
808                                 return -ENOMEM;
809                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
810                                 u32 suite = local->hw.wiphy->cipher_suites[r];
811                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
812                                     suite == WLAN_CIPHER_SUITE_WEP104)
813                                         continue;
814                                 suites[w++] = suite;
815                         }
816                         local->hw.wiphy->cipher_suites = suites;
817                         local->hw.wiphy->n_cipher_suites = w;
818                         local->wiphy_ciphers_allocated = true;
819                 }
820         }
821
822         if (!local->ops->remain_on_channel)
823                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
824
825         result = wiphy_register(local->hw.wiphy);
826         if (result < 0)
827                 goto fail_wiphy_register;
828
829         /*
830          * We use the number of queues for feature tests (QoS, HT) internally
831          * so restrict them appropriately.
832          */
833         if (hw->queues > IEEE80211_MAX_QUEUES)
834                 hw->queues = IEEE80211_MAX_QUEUES;
835
836         local->workqueue =
837                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
838         if (!local->workqueue) {
839                 result = -ENOMEM;
840                 goto fail_workqueue;
841         }
842
843         /*
844          * The hardware needs headroom for sending the frame,
845          * and we need some headroom for passing the frame to monitor
846          * interfaces, but never both at the same time.
847          */
848         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
849                         sizeof(struct ieee80211_tx_status_rtap_hdr));
850         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
851                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
852
853         debugfs_hw_add(local);
854
855         /*
856          * if the driver doesn't specify a max listen interval we
857          * use 5 which should be a safe default
858          */
859         if (local->hw.max_listen_interval == 0)
860                 local->hw.max_listen_interval = 5;
861
862         local->hw.conf.listen_interval = local->hw.max_listen_interval;
863
864         local->dynamic_ps_forced_timeout = -1;
865
866         result = sta_info_start(local);
867         if (result < 0)
868                 goto fail_sta_info;
869
870         result = ieee80211_wep_init(local);
871         if (result < 0)
872                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
873                             result);
874
875         rtnl_lock();
876
877         result = ieee80211_init_rate_ctrl_alg(local,
878                                               hw->rate_control_algorithm);
879         if (result < 0) {
880                 wiphy_debug(local->hw.wiphy,
881                             "Failed to initialize rate control algorithm\n");
882                 goto fail_rate;
883         }
884
885         /* add one default STA interface if supported */
886         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
887                 result = ieee80211_if_add(local, "wlan%d", NULL,
888                                           NL80211_IFTYPE_STATION, NULL);
889                 if (result)
890                         wiphy_warn(local->hw.wiphy,
891                                    "Failed to add default virtual iface\n");
892         }
893
894         rtnl_unlock();
895
896         ieee80211_led_init(local);
897
898         local->network_latency_notifier.notifier_call =
899                 ieee80211_max_network_latency;
900         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
901                                      &local->network_latency_notifier);
902         if (result) {
903                 rtnl_lock();
904                 goto fail_pm_qos;
905         }
906
907 #ifdef CONFIG_INET
908         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
909         result = register_inetaddr_notifier(&local->ifa_notifier);
910         if (result)
911                 goto fail_ifa;
912 #endif
913
914         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
915                         local->hw.napi_weight);
916
917         return 0;
918
919 #ifdef CONFIG_INET
920  fail_ifa:
921         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
922                                &local->network_latency_notifier);
923         rtnl_lock();
924 #endif
925  fail_pm_qos:
926         ieee80211_led_exit(local);
927         ieee80211_remove_interfaces(local);
928  fail_rate:
929         rtnl_unlock();
930         ieee80211_wep_free(local);
931         sta_info_stop(local);
932  fail_sta_info:
933         destroy_workqueue(local->workqueue);
934  fail_workqueue:
935         wiphy_unregister(local->hw.wiphy);
936  fail_wiphy_register:
937         if (local->wiphy_ciphers_allocated)
938                 kfree(local->hw.wiphy->cipher_suites);
939         kfree(local->int_scan_req);
940         return result;
941 }
942 EXPORT_SYMBOL(ieee80211_register_hw);
943
944 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
945 {
946         struct ieee80211_local *local = hw_to_local(hw);
947
948         tasklet_kill(&local->tx_pending_tasklet);
949         tasklet_kill(&local->tasklet);
950
951         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
952                                &local->network_latency_notifier);
953 #ifdef CONFIG_INET
954         unregister_inetaddr_notifier(&local->ifa_notifier);
955 #endif
956
957         rtnl_lock();
958
959         /*
960          * At this point, interface list manipulations are fine
961          * because the driver cannot be handing us frames any
962          * more and the tasklet is killed.
963          */
964         ieee80211_remove_interfaces(local);
965
966         rtnl_unlock();
967
968         /*
969          * Now all work items will be gone, but the
970          * timer might still be armed, so delete it
971          */
972         del_timer_sync(&local->work_timer);
973
974         cancel_work_sync(&local->restart_work);
975         cancel_work_sync(&local->reconfig_filter);
976
977         ieee80211_clear_tx_pending(local);
978         sta_info_stop(local);
979         rate_control_deinitialize(local);
980
981         if (skb_queue_len(&local->skb_queue) ||
982             skb_queue_len(&local->skb_queue_unreliable))
983                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
984         skb_queue_purge(&local->skb_queue);
985         skb_queue_purge(&local->skb_queue_unreliable);
986         skb_queue_purge(&local->rx_skb_queue);
987
988         destroy_workqueue(local->workqueue);
989         wiphy_unregister(local->hw.wiphy);
990         ieee80211_wep_free(local);
991         ieee80211_led_exit(local);
992         kfree(local->int_scan_req);
993 }
994 EXPORT_SYMBOL(ieee80211_unregister_hw);
995
996 void ieee80211_free_hw(struct ieee80211_hw *hw)
997 {
998         struct ieee80211_local *local = hw_to_local(hw);
999
1000         mutex_destroy(&local->iflist_mtx);
1001         mutex_destroy(&local->mtx);
1002
1003         if (local->wiphy_ciphers_allocated)
1004                 kfree(local->hw.wiphy->cipher_suites);
1005
1006         wiphy_free(local->hw.wiphy);
1007 }
1008 EXPORT_SYMBOL(ieee80211_free_hw);
1009
1010 static int __init ieee80211_init(void)
1011 {
1012         struct sk_buff *skb;
1013         int ret;
1014
1015         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1016         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1017                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1018
1019         ret = rc80211_minstrel_init();
1020         if (ret)
1021                 return ret;
1022
1023         ret = rc80211_minstrel_ht_init();
1024         if (ret)
1025                 goto err_minstrel;
1026
1027         ret = rc80211_pid_init();
1028         if (ret)
1029                 goto err_pid;
1030
1031         ret = ieee80211_iface_init();
1032         if (ret)
1033                 goto err_netdev;
1034
1035         return 0;
1036  err_netdev:
1037         rc80211_pid_exit();
1038  err_pid:
1039         rc80211_minstrel_ht_exit();
1040  err_minstrel:
1041         rc80211_minstrel_exit();
1042
1043         return ret;
1044 }
1045
1046 static void __exit ieee80211_exit(void)
1047 {
1048         rc80211_pid_exit();
1049         rc80211_minstrel_ht_exit();
1050         rc80211_minstrel_exit();
1051
1052         if (mesh_allocated)
1053                 ieee80211s_stop();
1054
1055         ieee80211_iface_exit();
1056 }
1057
1058
1059 subsys_initcall(ieee80211_init);
1060 module_exit(ieee80211_exit);
1061
1062 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1063 MODULE_LICENSE("GPL");