Merge git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
[firefly-linux-kernel-4.4.55.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.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/addrconf.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "led.h"
34 #include "cfg.h"
35 #include "debugfs.h"
36
37 void ieee80211_configure_filter(struct ieee80211_local *local)
38 {
39         u64 mc;
40         unsigned int changed_flags;
41         unsigned int new_flags = 0;
42
43         if (atomic_read(&local->iff_promiscs))
44                 new_flags |= FIF_PROMISC_IN_BSS;
45
46         if (atomic_read(&local->iff_allmultis))
47                 new_flags |= FIF_ALLMULTI;
48
49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
50             test_bit(SCAN_ONCHANNEL_SCANNING, &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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
96 {
97         struct ieee80211_sub_if_data *sdata;
98         struct cfg80211_chan_def chandef = {};
99         u32 changed = 0;
100         int power;
101         u32 offchannel_flag;
102
103         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
104
105         if (local->scan_chandef.chan) {
106                 chandef = local->scan_chandef;
107         } else if (local->tmp_channel) {
108                 chandef.chan = local->tmp_channel;
109                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
110                 chandef.center_freq1 = chandef.chan->center_freq;
111         } else
112                 chandef = local->_oper_chandef;
113
114         WARN(!cfg80211_chandef_valid(&chandef),
115              "control:%d MHz width:%d center: %d/%d MHz",
116              chandef.chan->center_freq, chandef.width,
117              chandef.center_freq1, chandef.center_freq2);
118
119         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
121         else
122                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
123
124         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
125
126         if (offchannel_flag ||
127             !cfg80211_chandef_identical(&local->hw.conf.chandef,
128                                         &local->_oper_chandef)) {
129                 local->hw.conf.chandef = chandef;
130                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
131         }
132
133         if (!conf_is_ht(&local->hw.conf)) {
134                 /*
135                  * mac80211.h documents that this is only valid
136                  * when the channel is set to an HT type, and
137                  * that otherwise STATIC is used.
138                  */
139                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
140         } else if (local->hw.conf.smps_mode != local->smps_mode) {
141                 local->hw.conf.smps_mode = local->smps_mode;
142                 changed |= IEEE80211_CONF_CHANGE_SMPS;
143         }
144
145         power = ieee80211_chandef_max_power(&chandef);
146
147         rcu_read_lock();
148         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
149                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
150                         continue;
151                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
152                         continue;
153                 power = min(power, sdata->vif.bss_conf.txpower);
154         }
155         rcu_read_unlock();
156
157         if (local->hw.conf.power_level != power) {
158                 changed |= IEEE80211_CONF_CHANGE_POWER;
159                 local->hw.conf.power_level = power;
160         }
161
162         return changed;
163 }
164
165 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
166 {
167         int ret = 0;
168
169         might_sleep();
170
171         if (!local->use_chanctx)
172                 changed |= ieee80211_hw_conf_chan(local);
173         else
174                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
175                              IEEE80211_CONF_CHANGE_POWER);
176
177         if (changed && local->open_count) {
178                 ret = drv_config(local, changed);
179                 /*
180                  * Goal:
181                  * HW reconfiguration should never fail, the driver has told
182                  * us what it can support so it should live up to that promise.
183                  *
184                  * Current status:
185                  * rfkill is not integrated with mac80211 and a
186                  * configuration command can thus fail if hardware rfkill
187                  * is enabled
188                  *
189                  * FIXME: integrate rfkill with mac80211 and then add this
190                  * WARN_ON() back
191                  *
192                  */
193                 /* WARN_ON(ret); */
194         }
195
196         return ret;
197 }
198
199 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
200                                       u32 changed)
201 {
202         struct ieee80211_local *local = sdata->local;
203
204         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
205                 return;
206
207         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
208 }
209
210 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
211 {
212         sdata->vif.bss_conf.use_cts_prot = false;
213         sdata->vif.bss_conf.use_short_preamble = false;
214         sdata->vif.bss_conf.use_short_slot = false;
215         return BSS_CHANGED_ERP_CTS_PROT |
216                BSS_CHANGED_ERP_PREAMBLE |
217                BSS_CHANGED_ERP_SLOT;
218 }
219
220 static void ieee80211_tasklet_handler(unsigned long data)
221 {
222         struct ieee80211_local *local = (struct ieee80211_local *) data;
223         struct sk_buff *skb;
224
225         while ((skb = skb_dequeue(&local->skb_queue)) ||
226                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
227                 switch (skb->pkt_type) {
228                 case IEEE80211_RX_MSG:
229                         /* Clear skb->pkt_type in order to not confuse kernel
230                          * netstack. */
231                         skb->pkt_type = 0;
232                         ieee80211_rx(&local->hw, skb);
233                         break;
234                 case IEEE80211_TX_STATUS_MSG:
235                         skb->pkt_type = 0;
236                         ieee80211_tx_status(&local->hw, skb);
237                         break;
238                 default:
239                         WARN(1, "mac80211: Packet is of unknown type %d\n",
240                              skb->pkt_type);
241                         dev_kfree_skb(skb);
242                         break;
243                 }
244         }
245 }
246
247 static void ieee80211_restart_work(struct work_struct *work)
248 {
249         struct ieee80211_local *local =
250                 container_of(work, struct ieee80211_local, restart_work);
251
252         /* wait for scan work complete */
253         flush_workqueue(local->workqueue);
254
255         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
256              "%s called with hardware scan in progress\n", __func__);
257
258         rtnl_lock();
259         ieee80211_scan_cancel(local);
260         ieee80211_reconfig(local);
261         rtnl_unlock();
262 }
263
264 void ieee80211_restart_hw(struct ieee80211_hw *hw)
265 {
266         struct ieee80211_local *local = hw_to_local(hw);
267
268         trace_api_restart_hw(local);
269
270         wiphy_info(hw->wiphy,
271                    "Hardware restart was requested\n");
272
273         /* use this reason, ieee80211_reconfig will unblock it */
274         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
275                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
276
277         /*
278          * Stop all Rx during the reconfig. We don't want state changes
279          * or driver callbacks while this is in progress.
280          */
281         local->in_reconfig = true;
282         barrier();
283
284         schedule_work(&local->restart_work);
285 }
286 EXPORT_SYMBOL(ieee80211_restart_hw);
287
288 #ifdef CONFIG_INET
289 static int ieee80211_ifa_changed(struct notifier_block *nb,
290                                  unsigned long data, void *arg)
291 {
292         struct in_ifaddr *ifa = arg;
293         struct ieee80211_local *local =
294                 container_of(nb, struct ieee80211_local,
295                              ifa_notifier);
296         struct net_device *ndev = ifa->ifa_dev->dev;
297         struct wireless_dev *wdev = ndev->ieee80211_ptr;
298         struct in_device *idev;
299         struct ieee80211_sub_if_data *sdata;
300         struct ieee80211_bss_conf *bss_conf;
301         struct ieee80211_if_managed *ifmgd;
302         int c = 0;
303
304         /* Make sure it's our interface that got changed */
305         if (!wdev)
306                 return NOTIFY_DONE;
307
308         if (wdev->wiphy != local->hw.wiphy)
309                 return NOTIFY_DONE;
310
311         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
312         bss_conf = &sdata->vif.bss_conf;
313
314         /* ARP filtering is only supported in managed mode */
315         if (sdata->vif.type != NL80211_IFTYPE_STATION)
316                 return NOTIFY_DONE;
317
318         idev = __in_dev_get_rtnl(sdata->dev);
319         if (!idev)
320                 return NOTIFY_DONE;
321
322         ifmgd = &sdata->u.mgd;
323         sdata_lock(sdata);
324
325         /* Copy the addresses to the bss_conf list */
326         ifa = idev->ifa_list;
327         while (ifa) {
328                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
329                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
330                 ifa = ifa->ifa_next;
331                 c++;
332         }
333
334         bss_conf->arp_addr_cnt = c;
335
336         /* Configure driver only if associated (which also implies it is up) */
337         if (ifmgd->associated)
338                 ieee80211_bss_info_change_notify(sdata,
339                                                  BSS_CHANGED_ARP_FILTER);
340
341         sdata_unlock(sdata);
342
343         return NOTIFY_OK;
344 }
345 #endif
346
347 #if IS_ENABLED(CONFIG_IPV6)
348 static int ieee80211_ifa6_changed(struct notifier_block *nb,
349                                   unsigned long data, void *arg)
350 {
351         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
352         struct inet6_dev *idev = ifa->idev;
353         struct net_device *ndev = ifa->idev->dev;
354         struct ieee80211_local *local =
355                 container_of(nb, struct ieee80211_local, ifa6_notifier);
356         struct wireless_dev *wdev = ndev->ieee80211_ptr;
357         struct ieee80211_sub_if_data *sdata;
358
359         /* Make sure it's our interface that got changed */
360         if (!wdev || wdev->wiphy != local->hw.wiphy)
361                 return NOTIFY_DONE;
362
363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
364
365         /*
366          * For now only support station mode. This is mostly because
367          * doing AP would have to handle AP_VLAN in some way ...
368          */
369         if (sdata->vif.type != NL80211_IFTYPE_STATION)
370                 return NOTIFY_DONE;
371
372         drv_ipv6_addr_change(local, sdata, idev);
373
374         return NOTIFY_OK;
375 }
376 #endif
377
378 /* There isn't a lot of sense in it, but you can transmit anything you like */
379 static const struct ieee80211_txrx_stypes
380 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
381         [NL80211_IFTYPE_ADHOC] = {
382                 .tx = 0xffff,
383                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
384                         BIT(IEEE80211_STYPE_AUTH >> 4) |
385                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
386                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
387         },
388         [NL80211_IFTYPE_STATION] = {
389                 .tx = 0xffff,
390                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
391                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
392         },
393         [NL80211_IFTYPE_AP] = {
394                 .tx = 0xffff,
395                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
396                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
398                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
399                         BIT(IEEE80211_STYPE_AUTH >> 4) |
400                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
401                         BIT(IEEE80211_STYPE_ACTION >> 4),
402         },
403         [NL80211_IFTYPE_AP_VLAN] = {
404                 /* copy AP */
405                 .tx = 0xffff,
406                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
407                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
408                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
409                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
412                         BIT(IEEE80211_STYPE_ACTION >> 4),
413         },
414         [NL80211_IFTYPE_P2P_CLIENT] = {
415                 .tx = 0xffff,
416                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
417                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
418         },
419         [NL80211_IFTYPE_P2P_GO] = {
420                 .tx = 0xffff,
421                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
422                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
424                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
425                         BIT(IEEE80211_STYPE_AUTH >> 4) |
426                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
427                         BIT(IEEE80211_STYPE_ACTION >> 4),
428         },
429         [NL80211_IFTYPE_MESH_POINT] = {
430                 .tx = 0xffff,
431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
432                         BIT(IEEE80211_STYPE_AUTH >> 4) |
433                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
434         },
435         [NL80211_IFTYPE_P2P_DEVICE] = {
436                 .tx = 0xffff,
437                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
438                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
439         },
440 };
441
442 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
443         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
444                              IEEE80211_HT_AMPDU_PARM_DENSITY,
445
446         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
447                                 IEEE80211_HT_CAP_MAX_AMSDU |
448                                 IEEE80211_HT_CAP_SGI_20 |
449                                 IEEE80211_HT_CAP_SGI_40 |
450                                 IEEE80211_HT_CAP_LDPC_CODING |
451                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
452         .mcs = {
453                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
454                              0xff, 0xff, 0xff, 0xff, 0xff, },
455         },
456 };
457
458 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
459         .vht_cap_info =
460                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
461                             IEEE80211_VHT_CAP_SHORT_GI_80 |
462                             IEEE80211_VHT_CAP_SHORT_GI_160 |
463                             IEEE80211_VHT_CAP_RXSTBC_1 |
464                             IEEE80211_VHT_CAP_RXSTBC_2 |
465                             IEEE80211_VHT_CAP_RXSTBC_3 |
466                             IEEE80211_VHT_CAP_RXSTBC_4 |
467                             IEEE80211_VHT_CAP_TXSTBC |
468                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
469                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
470                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
471                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
472                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
473         .supp_mcs = {
474                 .rx_mcs_map = cpu_to_le16(~0),
475                 .tx_mcs_map = cpu_to_le16(~0),
476         },
477 };
478
479 static const u8 extended_capabilities[] = {
480         0, 0, 0, 0, 0, 0, 0,
481         WLAN_EXT_CAPA8_OPMODE_NOTIF,
482 };
483
484 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
485                                         const struct ieee80211_ops *ops)
486 {
487         struct ieee80211_local *local;
488         int priv_size, i;
489         struct wiphy *wiphy;
490         bool use_chanctx;
491
492         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
493                     !ops->add_interface || !ops->remove_interface ||
494                     !ops->configure_filter))
495                 return NULL;
496
497         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
498                 return NULL;
499
500         /* check all or no channel context operations exist */
501         i = !!ops->add_chanctx + !!ops->remove_chanctx +
502             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
503             !!ops->unassign_vif_chanctx;
504         if (WARN_ON(i != 0 && i != 5))
505                 return NULL;
506         use_chanctx = i == 5;
507
508         /* Ensure 32-byte alignment of our private data and hw private data.
509          * We use the wiphy priv data for both our ieee80211_local and for
510          * the driver's private data
511          *
512          * In memory it'll be like this:
513          *
514          * +-------------------------+
515          * | struct wiphy           |
516          * +-------------------------+
517          * | struct ieee80211_local  |
518          * +-------------------------+
519          * | driver's private data   |
520          * +-------------------------+
521          *
522          */
523         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
524
525         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
526
527         if (!wiphy)
528                 return NULL;
529
530         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
531
532         wiphy->privid = mac80211_wiphy_privid;
533
534         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
535                         WIPHY_FLAG_4ADDR_AP |
536                         WIPHY_FLAG_4ADDR_STATION |
537                         WIPHY_FLAG_REPORTS_OBSS |
538                         WIPHY_FLAG_OFFCHAN_TX;
539
540         wiphy->extended_capabilities = extended_capabilities;
541         wiphy->extended_capabilities_mask = extended_capabilities;
542         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
543
544         if (ops->remain_on_channel)
545                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
546
547         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
548                            NL80211_FEATURE_SAE |
549                            NL80211_FEATURE_HT_IBSS |
550                            NL80211_FEATURE_VIF_TXPOWER |
551                            NL80211_FEATURE_USERSPACE_MPM;
552
553         if (!ops->hw_scan)
554                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
555                                    NL80211_FEATURE_AP_SCAN;
556
557
558         if (!ops->set_key)
559                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
560
561         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
562
563         local = wiphy_priv(wiphy);
564
565         local->hw.wiphy = wiphy;
566
567         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
568
569         local->ops = ops;
570         local->use_chanctx = use_chanctx;
571
572         /* set up some defaults */
573         local->hw.queues = 1;
574         local->hw.max_rates = 1;
575         local->hw.max_report_rates = 0;
576         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
577         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
578         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
579         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
580         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
581         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
582                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
583                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
584         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
585                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
586         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
587         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
588         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
589         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
590         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
591
592         INIT_LIST_HEAD(&local->interfaces);
593
594         __hw_addr_init(&local->mc_list);
595
596         mutex_init(&local->iflist_mtx);
597         mutex_init(&local->mtx);
598
599         mutex_init(&local->key_mtx);
600         spin_lock_init(&local->filter_lock);
601         spin_lock_init(&local->rx_path_lock);
602         spin_lock_init(&local->queue_stop_reason_lock);
603
604         INIT_LIST_HEAD(&local->chanctx_list);
605         mutex_init(&local->chanctx_mtx);
606
607         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
608
609         INIT_WORK(&local->restart_work, ieee80211_restart_work);
610
611         INIT_WORK(&local->radar_detected_work,
612                   ieee80211_dfs_radar_detected_work);
613
614         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
615         local->smps_mode = IEEE80211_SMPS_OFF;
616
617         INIT_WORK(&local->dynamic_ps_enable_work,
618                   ieee80211_dynamic_ps_enable_work);
619         INIT_WORK(&local->dynamic_ps_disable_work,
620                   ieee80211_dynamic_ps_disable_work);
621         setup_timer(&local->dynamic_ps_timer,
622                     ieee80211_dynamic_ps_timer, (unsigned long) local);
623
624         INIT_WORK(&local->sched_scan_stopped_work,
625                   ieee80211_sched_scan_stopped_work);
626
627         spin_lock_init(&local->ack_status_lock);
628         idr_init(&local->ack_status_frames);
629
630         sta_info_init(local);
631
632         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
633                 skb_queue_head_init(&local->pending[i]);
634                 atomic_set(&local->agg_queue_stop[i], 0);
635         }
636         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
637                      (unsigned long)local);
638
639         tasklet_init(&local->tasklet,
640                      ieee80211_tasklet_handler,
641                      (unsigned long) local);
642
643         skb_queue_head_init(&local->skb_queue);
644         skb_queue_head_init(&local->skb_queue_unreliable);
645
646         ieee80211_led_names(local);
647
648         ieee80211_roc_setup(local);
649
650         return &local->hw;
651 }
652 EXPORT_SYMBOL(ieee80211_alloc_hw);
653
654 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
655 {
656         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
657                           IS_ERR(local->wep_rx_tfm));
658         bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE;
659         const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes;
660         int n_suites = 0, r = 0, w = 0;
661         u32 *suites;
662         static const u32 cipher_suites[] = {
663                 /* keep WEP first, it may be removed below */
664                 WLAN_CIPHER_SUITE_WEP40,
665                 WLAN_CIPHER_SUITE_WEP104,
666                 WLAN_CIPHER_SUITE_TKIP,
667                 WLAN_CIPHER_SUITE_CCMP,
668
669                 /* keep last -- depends on hw flags! */
670                 WLAN_CIPHER_SUITE_AES_CMAC
671         };
672
673         /* Driver specifies the ciphers, we have nothing to do... */
674         if (local->hw.wiphy->cipher_suites && have_wep)
675                 return 0;
676
677         /* Set up cipher suites if driver relies on mac80211 cipher defs */
678         if (!local->hw.wiphy->cipher_suites && !cs) {
679                 local->hw.wiphy->cipher_suites = cipher_suites;
680                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
681
682                 if (!have_mfp)
683                         local->hw.wiphy->n_cipher_suites--;
684
685                 if (!have_wep) {
686                         local->hw.wiphy->cipher_suites += 2;
687                         local->hw.wiphy->n_cipher_suites -= 2;
688                 }
689
690                 return 0;
691         }
692
693         if (!local->hw.wiphy->cipher_suites) {
694                 /*
695                  * Driver specifies cipher schemes only
696                  * We start counting ciphers defined by schemes, TKIP and CCMP
697                  */
698                 n_suites = local->hw.n_cipher_schemes + 2;
699
700                 /* check if we have WEP40 and WEP104 */
701                 if (have_wep)
702                         n_suites += 2;
703
704                 /* check if we have AES_CMAC */
705                 if (have_mfp)
706                         n_suites++;
707
708                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
709                 if (!suites)
710                         return -ENOMEM;
711
712                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
713                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
714
715                 if (have_wep) {
716                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
717                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
718                 }
719
720                 if (have_mfp)
721                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
722
723                 for (r = 0; r < local->hw.n_cipher_schemes; r++)
724                         suites[w++] = cs[r].cipher;
725         } else {
726                 /* Driver provides cipher suites, but we need to exclude WEP */
727                 suites = kmemdup(local->hw.wiphy->cipher_suites,
728                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
729                                  GFP_KERNEL);
730                 if (!suites)
731                         return -ENOMEM;
732
733                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
734                         u32 suite = local->hw.wiphy->cipher_suites[r];
735
736                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
737                             suite == WLAN_CIPHER_SUITE_WEP104)
738                                 continue;
739                         suites[w++] = suite;
740                 }
741         }
742
743         local->hw.wiphy->cipher_suites = suites;
744         local->hw.wiphy->n_cipher_suites = w;
745         local->wiphy_ciphers_allocated = true;
746
747         return 0;
748 }
749
750 int ieee80211_register_hw(struct ieee80211_hw *hw)
751 {
752         struct ieee80211_local *local = hw_to_local(hw);
753         int result, i;
754         enum ieee80211_band band;
755         int channels, max_bitrates;
756         bool supp_ht, supp_vht;
757         netdev_features_t feature_whitelist;
758         struct cfg80211_chan_def dflt_chandef = {};
759
760         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
761             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
762              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
763                 return -EINVAL;
764
765 #ifdef CONFIG_PM
766         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
767                 return -EINVAL;
768 #endif
769
770         if (!local->use_chanctx) {
771                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
772                         const struct ieee80211_iface_combination *comb;
773
774                         comb = &local->hw.wiphy->iface_combinations[i];
775
776                         if (comb->num_different_channels > 1)
777                                 return -EINVAL;
778                 }
779         } else {
780                 /*
781                  * WDS is currently prohibited when channel contexts are used
782                  * because there's no clear definition of which channel WDS
783                  * type interfaces use
784                  */
785                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
786                         return -EINVAL;
787
788                 /* DFS currently not supported with channel context drivers */
789                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
790                         const struct ieee80211_iface_combination *comb;
791
792                         comb = &local->hw.wiphy->iface_combinations[i];
793
794                         if (comb->radar_detect_widths)
795                                 return -EINVAL;
796                 }
797         }
798
799         /* Only HW csum features are currently compatible with mac80211 */
800         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
801                             NETIF_F_HW_CSUM;
802         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
803                 return -EINVAL;
804
805         if (hw->max_report_rates == 0)
806                 hw->max_report_rates = hw->max_rates;
807
808         local->rx_chains = 1;
809
810         /*
811          * generic code guarantees at least one band,
812          * set this very early because much code assumes
813          * that hw.conf.channel is assigned
814          */
815         channels = 0;
816         max_bitrates = 0;
817         supp_ht = false;
818         supp_vht = false;
819         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
820                 struct ieee80211_supported_band *sband;
821
822                 sband = local->hw.wiphy->bands[band];
823                 if (!sband)
824                         continue;
825
826                 if (!dflt_chandef.chan) {
827                         cfg80211_chandef_create(&dflt_chandef,
828                                                 &sband->channels[0],
829                                                 NL80211_CHAN_NO_HT);
830                         /* init channel we're on */
831                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
832                                 local->hw.conf.chandef = dflt_chandef;
833                                 local->_oper_chandef = dflt_chandef;
834                         }
835                         local->monitor_chandef = dflt_chandef;
836                 }
837
838                 channels += sband->n_channels;
839
840                 if (max_bitrates < sband->n_bitrates)
841                         max_bitrates = sband->n_bitrates;
842                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
843                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
844
845                 if (sband->ht_cap.ht_supported)
846                         local->rx_chains =
847                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
848                                     local->rx_chains);
849
850                 /* TODO: consider VHT for RX chains, hopefully it's the same */
851         }
852
853         /* if low-level driver supports AP, we also support VLAN */
854         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
855                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
856                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
857         }
858
859         /* mac80211 always supports monitor */
860         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
861         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
862
863         /* mac80211 doesn't support more than one IBSS interface right now */
864         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
865                 const struct ieee80211_iface_combination *c;
866                 int j;
867
868                 c = &hw->wiphy->iface_combinations[i];
869
870                 for (j = 0; j < c->n_limits; j++)
871                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
872                             c->limits[j].max > 1)
873                                 return -EINVAL;
874         }
875
876         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
877                                       sizeof(void *) * channels, GFP_KERNEL);
878         if (!local->int_scan_req)
879                 return -ENOMEM;
880
881         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
882                 if (!local->hw.wiphy->bands[band])
883                         continue;
884                 local->int_scan_req->rates[band] = (u32) -1;
885         }
886
887 #ifndef CONFIG_MAC80211_MESH
888         /* mesh depends on Kconfig, but drivers should set it if they want */
889         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
890 #endif
891
892         /* if the underlying driver supports mesh, mac80211 will (at least)
893          * provide routing of mesh authentication frames to userspace */
894         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
895                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
896
897         /* mac80211 supports control port protocol changing */
898         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
899
900         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
901                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
902         } else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {
903                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
904                 if (hw->max_signal <= 0) {
905                         result = -EINVAL;
906                         goto fail_wiphy_register;
907                 }
908         }
909
910         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
911              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
912              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
913
914         /*
915          * Calculate scan IE length -- we need this to alloc
916          * memory and to subtract from the driver limit. It
917          * includes the DS Params, (extended) supported rates, and HT
918          * information -- SSID is the driver's responsibility.
919          */
920         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
921                 3 /* DS Params */;
922         if (supp_ht)
923                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
924
925         if (supp_vht)
926                 local->scan_ies_len +=
927                         2 + sizeof(struct ieee80211_vht_cap);
928
929         if (!local->ops->hw_scan) {
930                 /* For hw_scan, driver needs to set these up. */
931                 local->hw.wiphy->max_scan_ssids = 4;
932                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
933         }
934
935         /*
936          * If the driver supports any scan IEs, then assume the
937          * limit includes the IEs mac80211 will add, otherwise
938          * leave it at zero and let the driver sort it out; we
939          * still pass our IEs to the driver but userspace will
940          * not be allowed to in that case.
941          */
942         if (local->hw.wiphy->max_scan_ie_len)
943                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
944
945         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
946                                          local->hw.n_cipher_schemes));
947
948         result = ieee80211_init_cipher_suites(local);
949         if (result < 0)
950                 goto fail_wiphy_register;
951
952         if (!local->ops->remain_on_channel)
953                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
954
955         /* mac80211 based drivers don't support internal TDLS setup */
956         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
957                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
958
959         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
960
961         result = wiphy_register(local->hw.wiphy);
962         if (result < 0)
963                 goto fail_wiphy_register;
964
965         /*
966          * We use the number of queues for feature tests (QoS, HT) internally
967          * so restrict them appropriately.
968          */
969         if (hw->queues > IEEE80211_MAX_QUEUES)
970                 hw->queues = IEEE80211_MAX_QUEUES;
971
972         local->workqueue =
973                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
974         if (!local->workqueue) {
975                 result = -ENOMEM;
976                 goto fail_workqueue;
977         }
978
979         /*
980          * The hardware needs headroom for sending the frame,
981          * and we need some headroom for passing the frame to monitor
982          * interfaces, but never both at the same time.
983          */
984         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
985                                    IEEE80211_TX_STATUS_HEADROOM);
986
987         debugfs_hw_add(local);
988
989         /*
990          * if the driver doesn't specify a max listen interval we
991          * use 5 which should be a safe default
992          */
993         if (local->hw.max_listen_interval == 0)
994                 local->hw.max_listen_interval = 5;
995
996         local->hw.conf.listen_interval = local->hw.max_listen_interval;
997
998         local->dynamic_ps_forced_timeout = -1;
999
1000         result = ieee80211_wep_init(local);
1001         if (result < 0)
1002                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1003                             result);
1004
1005         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1006
1007         ieee80211_led_init(local);
1008
1009         rtnl_lock();
1010
1011         result = ieee80211_init_rate_ctrl_alg(local,
1012                                               hw->rate_control_algorithm);
1013         if (result < 0) {
1014                 wiphy_debug(local->hw.wiphy,
1015                             "Failed to initialize rate control algorithm\n");
1016                 goto fail_rate;
1017         }
1018
1019         /* add one default STA interface if supported */
1020         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1021                 result = ieee80211_if_add(local, "wlan%d", NULL,
1022                                           NL80211_IFTYPE_STATION, NULL);
1023                 if (result)
1024                         wiphy_warn(local->hw.wiphy,
1025                                    "Failed to add default virtual iface\n");
1026         }
1027
1028         rtnl_unlock();
1029
1030         local->network_latency_notifier.notifier_call =
1031                 ieee80211_max_network_latency;
1032         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1033                                      &local->network_latency_notifier);
1034         if (result) {
1035                 rtnl_lock();
1036                 goto fail_pm_qos;
1037         }
1038
1039 #ifdef CONFIG_INET
1040         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1041         result = register_inetaddr_notifier(&local->ifa_notifier);
1042         if (result)
1043                 goto fail_ifa;
1044 #endif
1045
1046 #if IS_ENABLED(CONFIG_IPV6)
1047         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1048         result = register_inet6addr_notifier(&local->ifa6_notifier);
1049         if (result)
1050                 goto fail_ifa6;
1051 #endif
1052
1053         return 0;
1054
1055 #if IS_ENABLED(CONFIG_IPV6)
1056  fail_ifa6:
1057 #ifdef CONFIG_INET
1058         unregister_inetaddr_notifier(&local->ifa_notifier);
1059 #endif
1060 #endif
1061 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1062  fail_ifa:
1063         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1064                                &local->network_latency_notifier);
1065         rtnl_lock();
1066 #endif
1067  fail_pm_qos:
1068         ieee80211_led_exit(local);
1069         ieee80211_remove_interfaces(local);
1070  fail_rate:
1071         rtnl_unlock();
1072         ieee80211_wep_free(local);
1073         sta_info_stop(local);
1074         destroy_workqueue(local->workqueue);
1075  fail_workqueue:
1076         wiphy_unregister(local->hw.wiphy);
1077  fail_wiphy_register:
1078         if (local->wiphy_ciphers_allocated)
1079                 kfree(local->hw.wiphy->cipher_suites);
1080         kfree(local->int_scan_req);
1081         return result;
1082 }
1083 EXPORT_SYMBOL(ieee80211_register_hw);
1084
1085 void ieee80211_napi_add(struct ieee80211_hw *hw, struct napi_struct *napi,
1086                         struct net_device *napi_dev,
1087                         int (*poll)(struct napi_struct *, int),
1088                         int weight)
1089 {
1090         struct ieee80211_local *local = hw_to_local(hw);
1091
1092         netif_napi_add(napi_dev, napi, poll, weight);
1093         local->napi = napi;
1094 }
1095 EXPORT_SYMBOL_GPL(ieee80211_napi_add);
1096
1097 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1098 {
1099         struct ieee80211_local *local = hw_to_local(hw);
1100
1101         tasklet_kill(&local->tx_pending_tasklet);
1102         tasklet_kill(&local->tasklet);
1103
1104         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1105                                &local->network_latency_notifier);
1106 #ifdef CONFIG_INET
1107         unregister_inetaddr_notifier(&local->ifa_notifier);
1108 #endif
1109 #if IS_ENABLED(CONFIG_IPV6)
1110         unregister_inet6addr_notifier(&local->ifa6_notifier);
1111 #endif
1112
1113         rtnl_lock();
1114
1115         /*
1116          * At this point, interface list manipulations are fine
1117          * because the driver cannot be handing us frames any
1118          * more and the tasklet is killed.
1119          */
1120         ieee80211_remove_interfaces(local);
1121
1122         rtnl_unlock();
1123
1124         cancel_work_sync(&local->restart_work);
1125         cancel_work_sync(&local->reconfig_filter);
1126         flush_work(&local->sched_scan_stopped_work);
1127
1128         ieee80211_clear_tx_pending(local);
1129         rate_control_deinitialize(local);
1130
1131         if (skb_queue_len(&local->skb_queue) ||
1132             skb_queue_len(&local->skb_queue_unreliable))
1133                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1134         skb_queue_purge(&local->skb_queue);
1135         skb_queue_purge(&local->skb_queue_unreliable);
1136
1137         destroy_workqueue(local->workqueue);
1138         wiphy_unregister(local->hw.wiphy);
1139         sta_info_stop(local);
1140         ieee80211_wep_free(local);
1141         ieee80211_led_exit(local);
1142         kfree(local->int_scan_req);
1143 }
1144 EXPORT_SYMBOL(ieee80211_unregister_hw);
1145
1146 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1147 {
1148         WARN_ONCE(1, "Have pending ack frames!\n");
1149         kfree_skb(p);
1150         return 0;
1151 }
1152
1153 void ieee80211_free_hw(struct ieee80211_hw *hw)
1154 {
1155         struct ieee80211_local *local = hw_to_local(hw);
1156
1157         mutex_destroy(&local->iflist_mtx);
1158         mutex_destroy(&local->mtx);
1159
1160         if (local->wiphy_ciphers_allocated)
1161                 kfree(local->hw.wiphy->cipher_suites);
1162
1163         idr_for_each(&local->ack_status_frames,
1164                      ieee80211_free_ack_frame, NULL);
1165         idr_destroy(&local->ack_status_frames);
1166
1167         kfree(rcu_access_pointer(local->tx_latency));
1168
1169         wiphy_free(local->hw.wiphy);
1170 }
1171 EXPORT_SYMBOL(ieee80211_free_hw);
1172
1173 static int __init ieee80211_init(void)
1174 {
1175         struct sk_buff *skb;
1176         int ret;
1177
1178         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1179         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1180                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1181
1182         ret = rc80211_minstrel_init();
1183         if (ret)
1184                 return ret;
1185
1186         ret = rc80211_minstrel_ht_init();
1187         if (ret)
1188                 goto err_minstrel;
1189
1190         ret = rc80211_pid_init();
1191         if (ret)
1192                 goto err_pid;
1193
1194         ret = ieee80211_iface_init();
1195         if (ret)
1196                 goto err_netdev;
1197
1198         return 0;
1199  err_netdev:
1200         rc80211_pid_exit();
1201  err_pid:
1202         rc80211_minstrel_ht_exit();
1203  err_minstrel:
1204         rc80211_minstrel_exit();
1205
1206         return ret;
1207 }
1208
1209 static void __exit ieee80211_exit(void)
1210 {
1211         rc80211_pid_exit();
1212         rc80211_minstrel_ht_exit();
1213         rc80211_minstrel_exit();
1214
1215         ieee80211s_stop();
1216
1217         ieee80211_iface_exit();
1218
1219         rcu_barrier();
1220 }
1221
1222
1223 subsys_initcall(ieee80211_init);
1224 module_exit(ieee80211_exit);
1225
1226 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1227 MODULE_LICENSE("GPL");