Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[muen/linux.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  * Copyright 2013-2014  Intel Mobile Communications GmbH
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <net/mac80211.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/bitmap.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 "debugfs.h"
35
36 void ieee80211_configure_filter(struct ieee80211_local *local)
37 {
38         u64 mc;
39         unsigned int changed_flags;
40         unsigned int new_flags = 0;
41
42         if (atomic_read(&local->iff_allmultis))
43                 new_flags |= FIF_ALLMULTI;
44
45         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
46             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
47                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
48
49         if (local->fif_probe_req || local->probe_req_reg)
50                 new_flags |= FIF_PROBE_REQ;
51
52         if (local->fif_fcsfail)
53                 new_flags |= FIF_FCSFAIL;
54
55         if (local->fif_plcpfail)
56                 new_flags |= FIF_PLCPFAIL;
57
58         if (local->fif_control)
59                 new_flags |= FIF_CONTROL;
60
61         if (local->fif_other_bss)
62                 new_flags |= FIF_OTHER_BSS;
63
64         if (local->fif_pspoll)
65                 new_flags |= FIF_PSPOLL;
66
67         spin_lock_bh(&local->filter_lock);
68         changed_flags = local->filter_flags ^ new_flags;
69
70         mc = drv_prepare_multicast(local, &local->mc_list);
71         spin_unlock_bh(&local->filter_lock);
72
73         /* be a bit nasty */
74         new_flags |= (1<<31);
75
76         drv_configure_filter(local, changed_flags, &new_flags, mc);
77
78         WARN_ON(new_flags & (1<<31));
79
80         local->filter_flags = new_flags & ~(1<<31);
81 }
82
83 static void ieee80211_reconfig_filter(struct work_struct *work)
84 {
85         struct ieee80211_local *local =
86                 container_of(work, struct ieee80211_local, reconfig_filter);
87
88         ieee80211_configure_filter(local);
89 }
90
91 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
92 {
93         struct ieee80211_sub_if_data *sdata;
94         struct cfg80211_chan_def chandef = {};
95         u32 changed = 0;
96         int power;
97         u32 offchannel_flag;
98
99         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
100
101         if (local->scan_chandef.chan) {
102                 chandef = local->scan_chandef;
103         } else if (local->tmp_channel) {
104                 chandef.chan = local->tmp_channel;
105                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
106                 chandef.center_freq1 = chandef.chan->center_freq;
107         } else
108                 chandef = local->_oper_chandef;
109
110         WARN(!cfg80211_chandef_valid(&chandef),
111              "control:%d MHz width:%d center: %d/%d MHz",
112              chandef.chan->center_freq, chandef.width,
113              chandef.center_freq1, chandef.center_freq2);
114
115         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
117         else
118                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
119
120         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
121
122         if (offchannel_flag ||
123             !cfg80211_chandef_identical(&local->hw.conf.chandef,
124                                         &local->_oper_chandef)) {
125                 local->hw.conf.chandef = chandef;
126                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
127         }
128
129         if (!conf_is_ht(&local->hw.conf)) {
130                 /*
131                  * mac80211.h documents that this is only valid
132                  * when the channel is set to an HT type, and
133                  * that otherwise STATIC is used.
134                  */
135                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
136         } else if (local->hw.conf.smps_mode != local->smps_mode) {
137                 local->hw.conf.smps_mode = local->smps_mode;
138                 changed |= IEEE80211_CONF_CHANGE_SMPS;
139         }
140
141         power = ieee80211_chandef_max_power(&chandef);
142
143         rcu_read_lock();
144         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
145                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
146                         continue;
147                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
148                         continue;
149                 power = min(power, sdata->vif.bss_conf.txpower);
150         }
151         rcu_read_unlock();
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         return changed;
159 }
160
161 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
162 {
163         int ret = 0;
164
165         might_sleep();
166
167         if (!local->use_chanctx)
168                 changed |= ieee80211_hw_conf_chan(local);
169         else
170                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
171                              IEEE80211_CONF_CHANGE_POWER);
172
173         if (changed && local->open_count) {
174                 ret = drv_config(local, changed);
175                 /*
176                  * Goal:
177                  * HW reconfiguration should never fail, the driver has told
178                  * us what it can support so it should live up to that promise.
179                  *
180                  * Current status:
181                  * rfkill is not integrated with mac80211 and a
182                  * configuration command can thus fail if hardware rfkill
183                  * is enabled
184                  *
185                  * FIXME: integrate rfkill with mac80211 and then add this
186                  * WARN_ON() back
187                  *
188                  */
189                 /* WARN_ON(ret); */
190         }
191
192         return ret;
193 }
194
195 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
196                                       u32 changed)
197 {
198         struct ieee80211_local *local = sdata->local;
199
200         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
201                 return;
202
203         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
204 }
205
206 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
207 {
208         sdata->vif.bss_conf.use_cts_prot = false;
209         sdata->vif.bss_conf.use_short_preamble = false;
210         sdata->vif.bss_conf.use_short_slot = false;
211         return BSS_CHANGED_ERP_CTS_PROT |
212                BSS_CHANGED_ERP_PREAMBLE |
213                BSS_CHANGED_ERP_SLOT;
214 }
215
216 static void ieee80211_tasklet_handler(unsigned long data)
217 {
218         struct ieee80211_local *local = (struct ieee80211_local *) data;
219         struct sk_buff *skb;
220
221         while ((skb = skb_dequeue(&local->skb_queue)) ||
222                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
223                 switch (skb->pkt_type) {
224                 case IEEE80211_RX_MSG:
225                         /* Clear skb->pkt_type in order to not confuse kernel
226                          * netstack. */
227                         skb->pkt_type = 0;
228                         ieee80211_rx(&local->hw, skb);
229                         break;
230                 case IEEE80211_TX_STATUS_MSG:
231                         skb->pkt_type = 0;
232                         ieee80211_tx_status(&local->hw, skb);
233                         break;
234                 default:
235                         WARN(1, "mac80211: Packet is of unknown type %d\n",
236                              skb->pkt_type);
237                         dev_kfree_skb(skb);
238                         break;
239                 }
240         }
241 }
242
243 static void ieee80211_restart_work(struct work_struct *work)
244 {
245         struct ieee80211_local *local =
246                 container_of(work, struct ieee80211_local, restart_work);
247         struct ieee80211_sub_if_data *sdata;
248
249         /* wait for scan work complete */
250         flush_workqueue(local->workqueue);
251         flush_work(&local->sched_scan_stopped_work);
252
253         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
254              "%s called with hardware scan in progress\n", __func__);
255
256         flush_work(&local->radar_detected_work);
257         rtnl_lock();
258         list_for_each_entry(sdata, &local->interfaces, list)
259                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
260         ieee80211_scan_cancel(local);
261
262         /* make sure any new ROC will consider local->in_reconfig */
263         flush_delayed_work(&local->roc_work);
264         flush_work(&local->hw_roc_done);
265
266         /* wait for all packet processing to be done */
267         synchronize_net();
268
269         ieee80211_reconfig(local);
270         rtnl_unlock();
271 }
272
273 void ieee80211_restart_hw(struct ieee80211_hw *hw)
274 {
275         struct ieee80211_local *local = hw_to_local(hw);
276
277         trace_api_restart_hw(local);
278
279         wiphy_info(hw->wiphy,
280                    "Hardware restart was requested\n");
281
282         /* use this reason, ieee80211_reconfig will unblock it */
283         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
284                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
285                                         false);
286
287         /*
288          * Stop all Rx during the reconfig. We don't want state changes
289          * or driver callbacks while this is in progress.
290          */
291         local->in_reconfig = true;
292         barrier();
293
294         queue_work(system_freezable_wq, &local->restart_work);
295 }
296 EXPORT_SYMBOL(ieee80211_restart_hw);
297
298 #ifdef CONFIG_INET
299 static int ieee80211_ifa_changed(struct notifier_block *nb,
300                                  unsigned long data, void *arg)
301 {
302         struct in_ifaddr *ifa = arg;
303         struct ieee80211_local *local =
304                 container_of(nb, struct ieee80211_local,
305                              ifa_notifier);
306         struct net_device *ndev = ifa->ifa_dev->dev;
307         struct wireless_dev *wdev = ndev->ieee80211_ptr;
308         struct in_device *idev;
309         struct ieee80211_sub_if_data *sdata;
310         struct ieee80211_bss_conf *bss_conf;
311         struct ieee80211_if_managed *ifmgd;
312         int c = 0;
313
314         /* Make sure it's our interface that got changed */
315         if (!wdev)
316                 return NOTIFY_DONE;
317
318         if (wdev->wiphy != local->hw.wiphy)
319                 return NOTIFY_DONE;
320
321         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
322         bss_conf = &sdata->vif.bss_conf;
323
324         /* ARP filtering is only supported in managed mode */
325         if (sdata->vif.type != NL80211_IFTYPE_STATION)
326                 return NOTIFY_DONE;
327
328         idev = __in_dev_get_rtnl(sdata->dev);
329         if (!idev)
330                 return NOTIFY_DONE;
331
332         ifmgd = &sdata->u.mgd;
333         sdata_lock(sdata);
334
335         /* Copy the addresses to the bss_conf list */
336         ifa = idev->ifa_list;
337         while (ifa) {
338                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
339                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
340                 ifa = ifa->ifa_next;
341                 c++;
342         }
343
344         bss_conf->arp_addr_cnt = c;
345
346         /* Configure driver only if associated (which also implies it is up) */
347         if (ifmgd->associated)
348                 ieee80211_bss_info_change_notify(sdata,
349                                                  BSS_CHANGED_ARP_FILTER);
350
351         sdata_unlock(sdata);
352
353         return NOTIFY_OK;
354 }
355 #endif
356
357 #if IS_ENABLED(CONFIG_IPV6)
358 static int ieee80211_ifa6_changed(struct notifier_block *nb,
359                                   unsigned long data, void *arg)
360 {
361         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
362         struct inet6_dev *idev = ifa->idev;
363         struct net_device *ndev = ifa->idev->dev;
364         struct ieee80211_local *local =
365                 container_of(nb, struct ieee80211_local, ifa6_notifier);
366         struct wireless_dev *wdev = ndev->ieee80211_ptr;
367         struct ieee80211_sub_if_data *sdata;
368
369         /* Make sure it's our interface that got changed */
370         if (!wdev || wdev->wiphy != local->hw.wiphy)
371                 return NOTIFY_DONE;
372
373         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
374
375         /*
376          * For now only support station mode. This is mostly because
377          * doing AP would have to handle AP_VLAN in some way ...
378          */
379         if (sdata->vif.type != NL80211_IFTYPE_STATION)
380                 return NOTIFY_DONE;
381
382         drv_ipv6_addr_change(local, sdata, idev);
383
384         return NOTIFY_OK;
385 }
386 #endif
387
388 /* There isn't a lot of sense in it, but you can transmit anything you like */
389 static const struct ieee80211_txrx_stypes
390 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
391         [NL80211_IFTYPE_ADHOC] = {
392                 .tx = 0xffff,
393                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
394                         BIT(IEEE80211_STYPE_AUTH >> 4) |
395                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
396                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
397         },
398         [NL80211_IFTYPE_STATION] = {
399                 .tx = 0xffff,
400                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
401                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
402         },
403         [NL80211_IFTYPE_AP] = {
404                 .tx = 0xffff,
405                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
406                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
407                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
408                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
409                         BIT(IEEE80211_STYPE_AUTH >> 4) |
410                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
411                         BIT(IEEE80211_STYPE_ACTION >> 4),
412         },
413         [NL80211_IFTYPE_AP_VLAN] = {
414                 /* copy AP */
415                 .tx = 0xffff,
416                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
417                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
418                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
419                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
420                         BIT(IEEE80211_STYPE_AUTH >> 4) |
421                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
422                         BIT(IEEE80211_STYPE_ACTION >> 4),
423         },
424         [NL80211_IFTYPE_P2P_CLIENT] = {
425                 .tx = 0xffff,
426                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
427                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
428         },
429         [NL80211_IFTYPE_P2P_GO] = {
430                 .tx = 0xffff,
431                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
432                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
433                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
434                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
435                         BIT(IEEE80211_STYPE_AUTH >> 4) |
436                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
437                         BIT(IEEE80211_STYPE_ACTION >> 4),
438         },
439         [NL80211_IFTYPE_MESH_POINT] = {
440                 .tx = 0xffff,
441                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
442                         BIT(IEEE80211_STYPE_AUTH >> 4) |
443                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
444         },
445         [NL80211_IFTYPE_P2P_DEVICE] = {
446                 .tx = 0xffff,
447                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
448                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
449         },
450 };
451
452 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
453         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
454                              IEEE80211_HT_AMPDU_PARM_DENSITY,
455
456         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
457                                 IEEE80211_HT_CAP_MAX_AMSDU |
458                                 IEEE80211_HT_CAP_SGI_20 |
459                                 IEEE80211_HT_CAP_SGI_40 |
460                                 IEEE80211_HT_CAP_LDPC_CODING |
461                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
462         .mcs = {
463                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
464                              0xff, 0xff, 0xff, 0xff, 0xff, },
465         },
466 };
467
468 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
469         .vht_cap_info =
470                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
471                             IEEE80211_VHT_CAP_SHORT_GI_80 |
472                             IEEE80211_VHT_CAP_SHORT_GI_160 |
473                             IEEE80211_VHT_CAP_RXSTBC_1 |
474                             IEEE80211_VHT_CAP_RXSTBC_2 |
475                             IEEE80211_VHT_CAP_RXSTBC_3 |
476                             IEEE80211_VHT_CAP_RXSTBC_4 |
477                             IEEE80211_VHT_CAP_TXSTBC |
478                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
479                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
480                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
481                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
482                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
483         .supp_mcs = {
484                 .rx_mcs_map = cpu_to_le16(~0),
485                 .tx_mcs_map = cpu_to_le16(~0),
486         },
487 };
488
489 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
490                                            const struct ieee80211_ops *ops,
491                                            const char *requested_name)
492 {
493         struct ieee80211_local *local;
494         int priv_size, i;
495         struct wiphy *wiphy;
496         bool use_chanctx;
497
498         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
499                     !ops->add_interface || !ops->remove_interface ||
500                     !ops->configure_filter))
501                 return NULL;
502
503         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
504                 return NULL;
505
506         /* check all or no channel context operations exist */
507         i = !!ops->add_chanctx + !!ops->remove_chanctx +
508             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
509             !!ops->unassign_vif_chanctx;
510         if (WARN_ON(i != 0 && i != 5))
511                 return NULL;
512         use_chanctx = i == 5;
513
514         /* Ensure 32-byte alignment of our private data and hw private data.
515          * We use the wiphy priv data for both our ieee80211_local and for
516          * the driver's private data
517          *
518          * In memory it'll be like this:
519          *
520          * +-------------------------+
521          * | struct wiphy           |
522          * +-------------------------+
523          * | struct ieee80211_local  |
524          * +-------------------------+
525          * | driver's private data   |
526          * +-------------------------+
527          *
528          */
529         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
530
531         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
532
533         if (!wiphy)
534                 return NULL;
535
536         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
537
538         wiphy->privid = mac80211_wiphy_privid;
539
540         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
541                         WIPHY_FLAG_4ADDR_AP |
542                         WIPHY_FLAG_4ADDR_STATION |
543                         WIPHY_FLAG_REPORTS_OBSS |
544                         WIPHY_FLAG_OFFCHAN_TX;
545
546         if (ops->remain_on_channel)
547                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
548
549         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
550                            NL80211_FEATURE_SAE |
551                            NL80211_FEATURE_HT_IBSS |
552                            NL80211_FEATURE_VIF_TXPOWER |
553                            NL80211_FEATURE_MAC_ON_CREATE |
554                            NL80211_FEATURE_USERSPACE_MPM |
555                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
556         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
557         wiphy_ext_feature_set(wiphy,
558                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
559
560         if (!ops->hw_scan)
561                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
562                                    NL80211_FEATURE_AP_SCAN;
563
564
565         if (!ops->set_key)
566                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
567
568         if (ops->wake_tx_queue)
569                 wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
570
571         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
572
573         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
574
575         local = wiphy_priv(wiphy);
576
577         if (sta_info_init(local))
578                 goto err_free;
579
580         local->hw.wiphy = wiphy;
581
582         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
583
584         local->ops = ops;
585         local->use_chanctx = use_chanctx;
586
587         /* set up some defaults */
588         local->hw.queues = 1;
589         local->hw.max_rates = 1;
590         local->hw.max_report_rates = 0;
591         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
592         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
593         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
594         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
595         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
596         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
597                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
598                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
599         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
600                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
601         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
602         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
603         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
604         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
605         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
606
607         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
608
609         wiphy->extended_capabilities = local->ext_capa;
610         wiphy->extended_capabilities_mask = local->ext_capa;
611         wiphy->extended_capabilities_len =
612                 ARRAY_SIZE(local->ext_capa);
613
614         INIT_LIST_HEAD(&local->interfaces);
615         INIT_LIST_HEAD(&local->mon_list);
616
617         __hw_addr_init(&local->mc_list);
618
619         mutex_init(&local->iflist_mtx);
620         mutex_init(&local->mtx);
621
622         mutex_init(&local->key_mtx);
623         spin_lock_init(&local->filter_lock);
624         spin_lock_init(&local->rx_path_lock);
625         spin_lock_init(&local->queue_stop_reason_lock);
626
627         INIT_LIST_HEAD(&local->chanctx_list);
628         mutex_init(&local->chanctx_mtx);
629
630         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
631
632         INIT_WORK(&local->restart_work, ieee80211_restart_work);
633
634         INIT_WORK(&local->radar_detected_work,
635                   ieee80211_dfs_radar_detected_work);
636
637         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
638         local->smps_mode = IEEE80211_SMPS_OFF;
639
640         INIT_WORK(&local->dynamic_ps_enable_work,
641                   ieee80211_dynamic_ps_enable_work);
642         INIT_WORK(&local->dynamic_ps_disable_work,
643                   ieee80211_dynamic_ps_disable_work);
644         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
645
646         INIT_WORK(&local->sched_scan_stopped_work,
647                   ieee80211_sched_scan_stopped_work);
648
649         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
650
651         spin_lock_init(&local->ack_status_lock);
652         idr_init(&local->ack_status_frames);
653
654         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
655                 skb_queue_head_init(&local->pending[i]);
656                 atomic_set(&local->agg_queue_stop[i], 0);
657         }
658         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
659                      (unsigned long)local);
660
661         tasklet_init(&local->tasklet,
662                      ieee80211_tasklet_handler,
663                      (unsigned long) local);
664
665         skb_queue_head_init(&local->skb_queue);
666         skb_queue_head_init(&local->skb_queue_unreliable);
667         skb_queue_head_init(&local->skb_queue_tdls_chsw);
668
669         ieee80211_alloc_led_names(local);
670
671         ieee80211_roc_setup(local);
672
673         local->hw.radiotap_timestamp.units_pos = -1;
674         local->hw.radiotap_timestamp.accuracy = -1;
675
676         return &local->hw;
677  err_free:
678         wiphy_free(wiphy);
679         return NULL;
680 }
681 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
682
683 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
684 {
685         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
686                           IS_ERR(local->wep_rx_tfm));
687         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
688         int n_suites = 0, r = 0, w = 0;
689         u32 *suites;
690         static const u32 cipher_suites[] = {
691                 /* keep WEP first, it may be removed below */
692                 WLAN_CIPHER_SUITE_WEP40,
693                 WLAN_CIPHER_SUITE_WEP104,
694                 WLAN_CIPHER_SUITE_TKIP,
695                 WLAN_CIPHER_SUITE_CCMP,
696                 WLAN_CIPHER_SUITE_CCMP_256,
697                 WLAN_CIPHER_SUITE_GCMP,
698                 WLAN_CIPHER_SUITE_GCMP_256,
699
700                 /* keep last -- depends on hw flags! */
701                 WLAN_CIPHER_SUITE_AES_CMAC,
702                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
703                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
704                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
705         };
706
707         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
708             local->hw.wiphy->cipher_suites) {
709                 /* If the driver advertises, or doesn't support SW crypto,
710                  * we only need to remove WEP if necessary.
711                  */
712                 if (have_wep)
713                         return 0;
714
715                 /* well if it has _no_ ciphers ... fine */
716                 if (!local->hw.wiphy->n_cipher_suites)
717                         return 0;
718
719                 /* Driver provides cipher suites, but we need to exclude WEP */
720                 suites = kmemdup(local->hw.wiphy->cipher_suites,
721                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
722                                  GFP_KERNEL);
723                 if (!suites)
724                         return -ENOMEM;
725
726                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
727                         u32 suite = local->hw.wiphy->cipher_suites[r];
728
729                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
730                             suite == WLAN_CIPHER_SUITE_WEP104)
731                                 continue;
732                         suites[w++] = suite;
733                 }
734         } else if (!local->hw.cipher_schemes) {
735                 /* If the driver doesn't have cipher schemes, there's nothing
736                  * else to do other than assign the (software supported and
737                  * perhaps offloaded) cipher suites.
738                  */
739                 local->hw.wiphy->cipher_suites = cipher_suites;
740                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
741
742                 if (!have_mfp)
743                         local->hw.wiphy->n_cipher_suites -= 4;
744
745                 if (!have_wep) {
746                         local->hw.wiphy->cipher_suites += 2;
747                         local->hw.wiphy->n_cipher_suites -= 2;
748                 }
749
750                 /* not dynamically allocated, so just return */
751                 return 0;
752         } else {
753                 const struct ieee80211_cipher_scheme *cs;
754
755                 cs = local->hw.cipher_schemes;
756
757                 /* Driver specifies cipher schemes only (but not cipher suites
758                  * including the schemes)
759                  *
760                  * We start counting ciphers defined by schemes, TKIP, CCMP,
761                  * CCMP-256, GCMP, and GCMP-256
762                  */
763                 n_suites = local->hw.n_cipher_schemes + 5;
764
765                 /* check if we have WEP40 and WEP104 */
766                 if (have_wep)
767                         n_suites += 2;
768
769                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
770                  * BIP-GMAC-256
771                  */
772                 if (have_mfp)
773                         n_suites += 4;
774
775                 suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
776                 if (!suites)
777                         return -ENOMEM;
778
779                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
780                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
781                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
782                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
783                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
784
785                 if (have_wep) {
786                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
787                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
788                 }
789
790                 if (have_mfp) {
791                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
792                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
793                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
794                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
795                 }
796
797                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
798                         suites[w++] = cs[r].cipher;
799                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
800                                 kfree(suites);
801                                 return -EINVAL;
802                         }
803                 }
804         }
805
806         local->hw.wiphy->cipher_suites = suites;
807         local->hw.wiphy->n_cipher_suites = w;
808         local->wiphy_ciphers_allocated = true;
809
810         return 0;
811 }
812
813 int ieee80211_register_hw(struct ieee80211_hw *hw)
814 {
815         struct ieee80211_local *local = hw_to_local(hw);
816         int result, i;
817         enum nl80211_band band;
818         int channels, max_bitrates;
819         bool supp_ht, supp_vht;
820         netdev_features_t feature_whitelist;
821         struct cfg80211_chan_def dflt_chandef = {};
822
823         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
824             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
825              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
826                 return -EINVAL;
827
828         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
829             (!local->ops->tdls_channel_switch ||
830              !local->ops->tdls_cancel_channel_switch ||
831              !local->ops->tdls_recv_channel_switch))
832                 return -EOPNOTSUPP;
833
834         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
835                     !local->ops->set_frag_threshold))
836                 return -EINVAL;
837
838         if (WARN_ON(local->hw.wiphy->interface_modes &
839                         BIT(NL80211_IFTYPE_NAN) &&
840                     (!local->ops->start_nan || !local->ops->stop_nan)))
841                 return -EINVAL;
842
843 #ifdef CONFIG_PM
844         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
845                 return -EINVAL;
846 #endif
847
848         if (!local->use_chanctx) {
849                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
850                         const struct ieee80211_iface_combination *comb;
851
852                         comb = &local->hw.wiphy->iface_combinations[i];
853
854                         if (comb->num_different_channels > 1)
855                                 return -EINVAL;
856                 }
857         } else {
858                 /*
859                  * WDS is currently prohibited when channel contexts are used
860                  * because there's no clear definition of which channel WDS
861                  * type interfaces use
862                  */
863                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
864                         return -EINVAL;
865
866                 /* DFS is not supported with multi-channel combinations yet */
867                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
868                         const struct ieee80211_iface_combination *comb;
869
870                         comb = &local->hw.wiphy->iface_combinations[i];
871
872                         if (comb->radar_detect_widths &&
873                             comb->num_different_channels > 1)
874                                 return -EINVAL;
875                 }
876         }
877
878         /* Only HW csum features are currently compatible with mac80211 */
879         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
880                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
881                             NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;
882         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
883                 return -EINVAL;
884
885         if (hw->max_report_rates == 0)
886                 hw->max_report_rates = hw->max_rates;
887
888         local->rx_chains = 1;
889
890         /*
891          * generic code guarantees at least one band,
892          * set this very early because much code assumes
893          * that hw.conf.channel is assigned
894          */
895         channels = 0;
896         max_bitrates = 0;
897         supp_ht = false;
898         supp_vht = false;
899         for (band = 0; band < NUM_NL80211_BANDS; band++) {
900                 struct ieee80211_supported_band *sband;
901
902                 sband = local->hw.wiphy->bands[band];
903                 if (!sband)
904                         continue;
905
906                 if (!dflt_chandef.chan) {
907                         cfg80211_chandef_create(&dflt_chandef,
908                                                 &sband->channels[0],
909                                                 NL80211_CHAN_NO_HT);
910                         /* init channel we're on */
911                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
912                                 local->hw.conf.chandef = dflt_chandef;
913                                 local->_oper_chandef = dflt_chandef;
914                         }
915                         local->monitor_chandef = dflt_chandef;
916                 }
917
918                 channels += sband->n_channels;
919
920                 if (max_bitrates < sband->n_bitrates)
921                         max_bitrates = sband->n_bitrates;
922                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
923                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
924
925                 if (!sband->ht_cap.ht_supported)
926                         continue;
927
928                 /* TODO: consider VHT for RX chains, hopefully it's the same */
929                 local->rx_chains =
930                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
931                             local->rx_chains);
932
933                 /* no need to mask, SM_PS_DISABLED has all bits set */
934                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
935                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
936         }
937
938         /* if low-level driver supports AP, we also support VLAN.
939          * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
940          * based on their support to transmit SW encrypted packets.
941          */
942         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
943             !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
944                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
945                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
946         }
947
948         /* mac80211 always supports monitor */
949         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
950         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
951
952         /* mac80211 doesn't support more than one IBSS interface right now */
953         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
954                 const struct ieee80211_iface_combination *c;
955                 int j;
956
957                 c = &hw->wiphy->iface_combinations[i];
958
959                 for (j = 0; j < c->n_limits; j++)
960                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
961                             c->limits[j].max > 1)
962                                 return -EINVAL;
963         }
964
965         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
966                                       sizeof(void *) * channels, GFP_KERNEL);
967         if (!local->int_scan_req)
968                 return -ENOMEM;
969
970         for (band = 0; band < NUM_NL80211_BANDS; band++) {
971                 if (!local->hw.wiphy->bands[band])
972                         continue;
973                 local->int_scan_req->rates[band] = (u32) -1;
974         }
975
976 #ifndef CONFIG_MAC80211_MESH
977         /* mesh depends on Kconfig, but drivers should set it if they want */
978         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
979 #endif
980
981         /* if the underlying driver supports mesh, mac80211 will (at least)
982          * provide routing of mesh authentication frames to userspace */
983         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
984                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
985
986         /* mac80211 supports control port protocol changing */
987         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
988
989         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
990                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
991         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
992                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
993                 if (hw->max_signal <= 0) {
994                         result = -EINVAL;
995                         goto fail_wiphy_register;
996                 }
997         }
998
999         /*
1000          * Calculate scan IE length -- we need this to alloc
1001          * memory and to subtract from the driver limit. It
1002          * includes the DS Params, (extended) supported rates, and HT
1003          * information -- SSID is the driver's responsibility.
1004          */
1005         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1006                 3 /* DS Params */;
1007         if (supp_ht)
1008                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1009
1010         if (supp_vht)
1011                 local->scan_ies_len +=
1012                         2 + sizeof(struct ieee80211_vht_cap);
1013
1014         if (!local->ops->hw_scan) {
1015                 /* For hw_scan, driver needs to set these up. */
1016                 local->hw.wiphy->max_scan_ssids = 4;
1017                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1018         }
1019
1020         /*
1021          * If the driver supports any scan IEs, then assume the
1022          * limit includes the IEs mac80211 will add, otherwise
1023          * leave it at zero and let the driver sort it out; we
1024          * still pass our IEs to the driver but userspace will
1025          * not be allowed to in that case.
1026          */
1027         if (local->hw.wiphy->max_scan_ie_len)
1028                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1029
1030         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1031                                          local->hw.n_cipher_schemes));
1032
1033         result = ieee80211_init_cipher_suites(local);
1034         if (result < 0)
1035                 goto fail_wiphy_register;
1036
1037         if (!local->ops->remain_on_channel)
1038                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1039
1040         /* mac80211 based drivers don't support internal TDLS setup */
1041         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1042                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1043
1044         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1045         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1046                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1047
1048         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1049
1050         result = wiphy_register(local->hw.wiphy);
1051         if (result < 0)
1052                 goto fail_wiphy_register;
1053
1054         /*
1055          * We use the number of queues for feature tests (QoS, HT) internally
1056          * so restrict them appropriately.
1057          */
1058         if (hw->queues > IEEE80211_MAX_QUEUES)
1059                 hw->queues = IEEE80211_MAX_QUEUES;
1060
1061         local->workqueue =
1062                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1063         if (!local->workqueue) {
1064                 result = -ENOMEM;
1065                 goto fail_workqueue;
1066         }
1067
1068         /*
1069          * The hardware needs headroom for sending the frame,
1070          * and we need some headroom for passing the frame to monitor
1071          * interfaces, but never both at the same time.
1072          */
1073         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1074                                    IEEE80211_TX_STATUS_HEADROOM);
1075
1076         debugfs_hw_add(local);
1077
1078         /*
1079          * if the driver doesn't specify a max listen interval we
1080          * use 5 which should be a safe default
1081          */
1082         if (local->hw.max_listen_interval == 0)
1083                 local->hw.max_listen_interval = 5;
1084
1085         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1086
1087         local->dynamic_ps_forced_timeout = -1;
1088
1089         if (!local->hw.max_nan_de_entries)
1090                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1091
1092         result = ieee80211_wep_init(local);
1093         if (result < 0)
1094                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1095                             result);
1096
1097         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1098
1099         ieee80211_led_init(local);
1100
1101         result = ieee80211_txq_setup_flows(local);
1102         if (result)
1103                 goto fail_flows;
1104
1105         rtnl_lock();
1106
1107         result = ieee80211_init_rate_ctrl_alg(local,
1108                                               hw->rate_control_algorithm);
1109         if (result < 0) {
1110                 wiphy_debug(local->hw.wiphy,
1111                             "Failed to initialize rate control algorithm\n");
1112                 goto fail_rate;
1113         }
1114
1115         /* add one default STA interface if supported */
1116         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1117             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1118                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1119                                           NL80211_IFTYPE_STATION, NULL);
1120                 if (result)
1121                         wiphy_warn(local->hw.wiphy,
1122                                    "Failed to add default virtual iface\n");
1123         }
1124
1125         rtnl_unlock();
1126
1127 #ifdef CONFIG_INET
1128         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1129         result = register_inetaddr_notifier(&local->ifa_notifier);
1130         if (result)
1131                 goto fail_ifa;
1132 #endif
1133
1134 #if IS_ENABLED(CONFIG_IPV6)
1135         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1136         result = register_inet6addr_notifier(&local->ifa6_notifier);
1137         if (result)
1138                 goto fail_ifa6;
1139 #endif
1140
1141         return 0;
1142
1143 #if IS_ENABLED(CONFIG_IPV6)
1144  fail_ifa6:
1145 #ifdef CONFIG_INET
1146         unregister_inetaddr_notifier(&local->ifa_notifier);
1147 #endif
1148 #endif
1149 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1150  fail_ifa:
1151 #endif
1152         rtnl_lock();
1153         rate_control_deinitialize(local);
1154         ieee80211_remove_interfaces(local);
1155  fail_rate:
1156         rtnl_unlock();
1157         ieee80211_led_exit(local);
1158         ieee80211_wep_free(local);
1159         ieee80211_txq_teardown_flows(local);
1160  fail_flows:
1161         destroy_workqueue(local->workqueue);
1162  fail_workqueue:
1163         wiphy_unregister(local->hw.wiphy);
1164  fail_wiphy_register:
1165         if (local->wiphy_ciphers_allocated)
1166                 kfree(local->hw.wiphy->cipher_suites);
1167         kfree(local->int_scan_req);
1168         return result;
1169 }
1170 EXPORT_SYMBOL(ieee80211_register_hw);
1171
1172 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1173 {
1174         struct ieee80211_local *local = hw_to_local(hw);
1175
1176         tasklet_kill(&local->tx_pending_tasklet);
1177         tasklet_kill(&local->tasklet);
1178
1179 #ifdef CONFIG_INET
1180         unregister_inetaddr_notifier(&local->ifa_notifier);
1181 #endif
1182 #if IS_ENABLED(CONFIG_IPV6)
1183         unregister_inet6addr_notifier(&local->ifa6_notifier);
1184 #endif
1185
1186         rtnl_lock();
1187
1188         /*
1189          * At this point, interface list manipulations are fine
1190          * because the driver cannot be handing us frames any
1191          * more and the tasklet is killed.
1192          */
1193         ieee80211_remove_interfaces(local);
1194
1195         rtnl_unlock();
1196
1197         cancel_delayed_work_sync(&local->roc_work);
1198         cancel_work_sync(&local->restart_work);
1199         cancel_work_sync(&local->reconfig_filter);
1200         cancel_work_sync(&local->tdls_chsw_work);
1201         flush_work(&local->sched_scan_stopped_work);
1202         flush_work(&local->radar_detected_work);
1203
1204         ieee80211_clear_tx_pending(local);
1205         rate_control_deinitialize(local);
1206
1207         if (skb_queue_len(&local->skb_queue) ||
1208             skb_queue_len(&local->skb_queue_unreliable))
1209                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1210         skb_queue_purge(&local->skb_queue);
1211         skb_queue_purge(&local->skb_queue_unreliable);
1212         skb_queue_purge(&local->skb_queue_tdls_chsw);
1213         ieee80211_txq_teardown_flows(local);
1214
1215         destroy_workqueue(local->workqueue);
1216         wiphy_unregister(local->hw.wiphy);
1217         ieee80211_wep_free(local);
1218         ieee80211_led_exit(local);
1219         kfree(local->int_scan_req);
1220 }
1221 EXPORT_SYMBOL(ieee80211_unregister_hw);
1222
1223 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1224 {
1225         WARN_ONCE(1, "Have pending ack frames!\n");
1226         kfree_skb(p);
1227         return 0;
1228 }
1229
1230 void ieee80211_free_hw(struct ieee80211_hw *hw)
1231 {
1232         struct ieee80211_local *local = hw_to_local(hw);
1233
1234         mutex_destroy(&local->iflist_mtx);
1235         mutex_destroy(&local->mtx);
1236
1237         if (local->wiphy_ciphers_allocated)
1238                 kfree(local->hw.wiphy->cipher_suites);
1239
1240         idr_for_each(&local->ack_status_frames,
1241                      ieee80211_free_ack_frame, NULL);
1242         idr_destroy(&local->ack_status_frames);
1243
1244         sta_info_stop(local);
1245
1246         ieee80211_free_led_names(local);
1247
1248         wiphy_free(local->hw.wiphy);
1249 }
1250 EXPORT_SYMBOL(ieee80211_free_hw);
1251
1252 static int __init ieee80211_init(void)
1253 {
1254         struct sk_buff *skb;
1255         int ret;
1256
1257         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1258         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1259                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1260
1261         ret = rc80211_minstrel_init();
1262         if (ret)
1263                 return ret;
1264
1265         ret = rc80211_minstrel_ht_init();
1266         if (ret)
1267                 goto err_minstrel;
1268
1269         ret = ieee80211_iface_init();
1270         if (ret)
1271                 goto err_netdev;
1272
1273         return 0;
1274  err_netdev:
1275         rc80211_minstrel_ht_exit();
1276  err_minstrel:
1277         rc80211_minstrel_exit();
1278
1279         return ret;
1280 }
1281
1282 static void __exit ieee80211_exit(void)
1283 {
1284         rc80211_minstrel_ht_exit();
1285         rc80211_minstrel_exit();
1286
1287         ieee80211s_stop();
1288
1289         ieee80211_iface_exit();
1290
1291         rcu_barrier();
1292 }
1293
1294
1295 subsys_initcall(ieee80211_init);
1296 module_exit(ieee80211_exit);
1297
1298 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1299 MODULE_LICENSE("GPL");