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