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Linux/net/mac80211/main.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright 2002-2005, Instant802 Networks, Inc.
  4  * Copyright 2005-2006, Devicescape Software, Inc.
  5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  6  * Copyright 2013-2014  Intel Mobile Communications GmbH
  7  * Copyright (C) 2017     Intel Deutschland GmbH
  8  * Copyright (C) 2018-2021 Intel Corporation
  9  */
 10 
 11 #include <net/mac80211.h>
 12 #include <linux/module.h>
 13 #include <linux/fips.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         if (local->rx_mcast_action_reg)
 68                 new_flags |= FIF_MCAST_ACTION;
 69 
 70         spin_lock_bh(&local->filter_lock);
 71         changed_flags = local->filter_flags ^ new_flags;
 72 
 73         mc = drv_prepare_multicast(local, &local->mc_list);
 74         spin_unlock_bh(&local->filter_lock);
 75 
 76         /* be a bit nasty */
 77         new_flags |= (1<<31);
 78 
 79         drv_configure_filter(local, changed_flags, &new_flags, mc);
 80 
 81         WARN_ON(new_flags & (1<<31));
 82 
 83         local->filter_flags = new_flags & ~(1<<31);
 84 }
 85 
 86 static void ieee80211_reconfig_filter(struct work_struct *work)
 87 {
 88         struct ieee80211_local *local =
 89                 container_of(work, struct ieee80211_local, reconfig_filter);
 90 
 91         ieee80211_configure_filter(local);
 92 }
 93 
 94 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 95 {
 96         struct ieee80211_sub_if_data *sdata;
 97         struct cfg80211_chan_def chandef = {};
 98         u32 changed = 0;
 99         int power;
100         u32 offchannel_flag;
101 
102         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
103 
104         if (local->scan_chandef.chan) {
105                 chandef = local->scan_chandef;
106         } else if (local->tmp_channel) {
107                 chandef.chan = local->tmp_channel;
108                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
109                 chandef.center_freq1 = chandef.chan->center_freq;
110                 chandef.freq1_offset = chandef.chan->freq_offset;
111         } else
112                 chandef = local->_oper_chandef;
113 
114         WARN(!cfg80211_chandef_valid(&chandef),
115              "control:%d.%03d MHz width:%d center: %d.%03d/%d MHz",
116              chandef.chan->center_freq, chandef.chan->freq_offset,
117              chandef.width, chandef.center_freq1, chandef.freq1_offset,
118              chandef.center_freq2);
119 
120         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
121                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
122         else
123                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
124 
125         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
126 
127         if (offchannel_flag ||
128             !cfg80211_chandef_identical(&local->hw.conf.chandef,
129                                         &local->_oper_chandef)) {
130                 local->hw.conf.chandef = chandef;
131                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
132         }
133 
134         if (!conf_is_ht(&local->hw.conf)) {
135                 /*
136                  * mac80211.h documents that this is only valid
137                  * when the channel is set to an HT type, and
138                  * that otherwise STATIC is used.
139                  */
140                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
141         } else if (local->hw.conf.smps_mode != local->smps_mode) {
142                 local->hw.conf.smps_mode = local->smps_mode;
143                 changed |= IEEE80211_CONF_CHANGE_SMPS;
144         }
145 
146         power = ieee80211_chandef_max_power(&chandef);
147 
148         rcu_read_lock();
149         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
150                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
151                         continue;
152                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
153                         continue;
154                 if (sdata->vif.bss_conf.txpower == INT_MIN)
155                         continue;
156                 power = min(power, sdata->vif.bss_conf.txpower);
157         }
158         rcu_read_unlock();
159 
160         if (local->hw.conf.power_level != power) {
161                 changed |= IEEE80211_CONF_CHANGE_POWER;
162                 local->hw.conf.power_level = power;
163         }
164 
165         return changed;
166 }
167 
168 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
169 {
170         int ret = 0;
171 
172         might_sleep();
173 
174         if (!local->use_chanctx)
175                 changed |= ieee80211_hw_conf_chan(local);
176         else
177                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
178                              IEEE80211_CONF_CHANGE_POWER);
179 
180         if (changed && local->open_count) {
181                 ret = drv_config(local, changed);
182                 /*
183                  * Goal:
184                  * HW reconfiguration should never fail, the driver has told
185                  * us what it can support so it should live up to that promise.
186                  *
187                  * Current status:
188                  * rfkill is not integrated with mac80211 and a
189                  * configuration command can thus fail if hardware rfkill
190                  * is enabled
191                  *
192                  * FIXME: integrate rfkill with mac80211 and then add this
193                  * WARN_ON() back
194                  *
195                  */
196                 /* WARN_ON(ret); */
197         }
198 
199         return ret;
200 }
201 
202 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
203                                       u32 changed)
204 {
205         struct ieee80211_local *local = sdata->local;
206 
207         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
208                 return;
209 
210         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
211 }
212 
213 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
214 {
215         sdata->vif.bss_conf.use_cts_prot = false;
216         sdata->vif.bss_conf.use_short_preamble = false;
217         sdata->vif.bss_conf.use_short_slot = false;
218         return BSS_CHANGED_ERP_CTS_PROT |
219                BSS_CHANGED_ERP_PREAMBLE |
220                BSS_CHANGED_ERP_SLOT;
221 }
222 
223 static void ieee80211_tasklet_handler(struct tasklet_struct *t)
224 {
225         struct ieee80211_local *local = from_tasklet(local, t, tasklet);
226         struct sk_buff *skb;
227 
228         while ((skb = skb_dequeue(&local->skb_queue)) ||
229                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
230                 switch (skb->pkt_type) {
231                 case IEEE80211_RX_MSG:
232                         /* Clear skb->pkt_type in order to not confuse kernel
233                          * netstack. */
234                         skb->pkt_type = 0;
235                         ieee80211_rx(&local->hw, skb);
236                         break;
237                 case IEEE80211_TX_STATUS_MSG:
238                         skb->pkt_type = 0;
239                         ieee80211_tx_status(&local->hw, skb);
240                         break;
241                 default:
242                         WARN(1, "mac80211: Packet is of unknown type %d\n",
243                              skb->pkt_type);
244                         dev_kfree_skb(skb);
245                         break;
246                 }
247         }
248 }
249 
250 static void ieee80211_restart_work(struct work_struct *work)
251 {
252         struct ieee80211_local *local =
253                 container_of(work, struct ieee80211_local, restart_work);
254         struct ieee80211_sub_if_data *sdata;
255         int ret;
256 
257         /* wait for scan work complete */
258         flush_workqueue(local->workqueue);
259         flush_work(&local->sched_scan_stopped_work);
260         flush_work(&local->radar_detected_work);
261 
262         rtnl_lock();
263         /* we might do interface manipulations, so need both */
264         wiphy_lock(local->hw.wiphy);
265 
266         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
267              "%s called with hardware scan in progress\n", __func__);
268 
269         list_for_each_entry(sdata, &local->interfaces, list) {
270                 /*
271                  * XXX: there may be more work for other vif types and even
272                  * for station mode: a good thing would be to run most of
273                  * the iface type's dependent _stop (ieee80211_mg_stop,
274                  * ieee80211_ibss_stop) etc...
275                  * For now, fix only the specific bug that was seen: race
276                  * between csa_connection_drop_work and us.
277                  */
278                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
279                         /*
280                          * This worker is scheduled from the iface worker that
281                          * runs on mac80211's workqueue, so we can't be
282                          * scheduling this worker after the cancel right here.
283                          * The exception is ieee80211_chswitch_done.
284                          * Then we can have a race...
285                          */
286                         cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work);
287                         if (sdata->vif.csa_active) {
288                                 sdata_lock(sdata);
289                                 ieee80211_sta_connection_lost(sdata,
290                                                               sdata->u.mgd.associated->bssid,
291                                                               WLAN_REASON_UNSPECIFIED, false);
292                                 sdata_unlock(sdata);
293                         }
294                 }
295                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
296         }
297         ieee80211_scan_cancel(local);
298 
299         /* make sure any new ROC will consider local->in_reconfig */
300         flush_delayed_work(&local->roc_work);
301         flush_work(&local->hw_roc_done);
302 
303         /* wait for all packet processing to be done */
304         synchronize_net();
305 
306         ret = ieee80211_reconfig(local);
307         wiphy_unlock(local->hw.wiphy);
308 
309         if (ret)
310                 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
311 
312         rtnl_unlock();
313 }
314 
315 void ieee80211_restart_hw(struct ieee80211_hw *hw)
316 {
317         struct ieee80211_local *local = hw_to_local(hw);
318 
319         trace_api_restart_hw(local);
320 
321         wiphy_info(hw->wiphy,
322                    "Hardware restart was requested\n");
323 
324         /* use this reason, ieee80211_reconfig will unblock it */
325         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
326                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
327                                         false);
328 
329         /*
330          * Stop all Rx during the reconfig. We don't want state changes
331          * or driver callbacks while this is in progress.
332          */
333         local->in_reconfig = true;
334         barrier();
335 
336         queue_work(system_freezable_wq, &local->restart_work);
337 }
338 EXPORT_SYMBOL(ieee80211_restart_hw);
339 
340 #ifdef CONFIG_INET
341 static int ieee80211_ifa_changed(struct notifier_block *nb,
342                                  unsigned long data, void *arg)
343 {
344         struct in_ifaddr *ifa = arg;
345         struct ieee80211_local *local =
346                 container_of(nb, struct ieee80211_local,
347                              ifa_notifier);
348         struct net_device *ndev = ifa->ifa_dev->dev;
349         struct wireless_dev *wdev = ndev->ieee80211_ptr;
350         struct in_device *idev;
351         struct ieee80211_sub_if_data *sdata;
352         struct ieee80211_bss_conf *bss_conf;
353         struct ieee80211_if_managed *ifmgd;
354         int c = 0;
355 
356         /* Make sure it's our interface that got changed */
357         if (!wdev)
358                 return NOTIFY_DONE;
359 
360         if (wdev->wiphy != local->hw.wiphy)
361                 return NOTIFY_DONE;
362 
363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
364         bss_conf = &sdata->vif.bss_conf;
365 
366         /* ARP filtering is only supported in managed mode */
367         if (sdata->vif.type != NL80211_IFTYPE_STATION)
368                 return NOTIFY_DONE;
369 
370         idev = __in_dev_get_rtnl(sdata->dev);
371         if (!idev)
372                 return NOTIFY_DONE;
373 
374         ifmgd = &sdata->u.mgd;
375         sdata_lock(sdata);
376 
377         /* Copy the addresses to the bss_conf list */
378         ifa = rtnl_dereference(idev->ifa_list);
379         while (ifa) {
380                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
381                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
382                 ifa = rtnl_dereference(ifa->ifa_next);
383                 c++;
384         }
385 
386         bss_conf->arp_addr_cnt = c;
387 
388         /* Configure driver only if associated (which also implies it is up) */
389         if (ifmgd->associated)
390                 ieee80211_bss_info_change_notify(sdata,
391                                                  BSS_CHANGED_ARP_FILTER);
392 
393         sdata_unlock(sdata);
394 
395         return NOTIFY_OK;
396 }
397 #endif
398 
399 #if IS_ENABLED(CONFIG_IPV6)
400 static int ieee80211_ifa6_changed(struct notifier_block *nb,
401                                   unsigned long data, void *arg)
402 {
403         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
404         struct inet6_dev *idev = ifa->idev;
405         struct net_device *ndev = ifa->idev->dev;
406         struct ieee80211_local *local =
407                 container_of(nb, struct ieee80211_local, ifa6_notifier);
408         struct wireless_dev *wdev = ndev->ieee80211_ptr;
409         struct ieee80211_sub_if_data *sdata;
410 
411         /* Make sure it's our interface that got changed */
412         if (!wdev || wdev->wiphy != local->hw.wiphy)
413                 return NOTIFY_DONE;
414 
415         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
416 
417         /*
418          * For now only support station mode. This is mostly because
419          * doing AP would have to handle AP_VLAN in some way ...
420          */
421         if (sdata->vif.type != NL80211_IFTYPE_STATION)
422                 return NOTIFY_DONE;
423 
424         drv_ipv6_addr_change(local, sdata, idev);
425 
426         return NOTIFY_OK;
427 }
428 #endif
429 
430 /* There isn't a lot of sense in it, but you can transmit anything you like */
431 static const struct ieee80211_txrx_stypes
432 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
433         [NL80211_IFTYPE_ADHOC] = {
434                 .tx = 0xffff,
435                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
438                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
439         },
440         [NL80211_IFTYPE_STATION] = {
441                 .tx = 0xffff,
442                 /*
443                  * To support Pre Association Security Negotiation (PASN) while
444                  * already associated to one AP, allow user space to register to
445                  * Rx authentication frames, so that the user space logic would
446                  * be able to receive/handle authentication frames from a
447                  * different AP as part of PASN.
448                  * It is expected that user space would intelligently register
449                  * for Rx authentication frames, i.e., only when PASN is used
450                  * and configure a match filter only for PASN authentication
451                  * algorithm, as otherwise the MLME functionality of mac80211
452                  * would be broken.
453                  */
454                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
456                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
457         },
458         [NL80211_IFTYPE_AP] = {
459                 .tx = 0xffff,
460                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
461                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
462                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
463                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
464                         BIT(IEEE80211_STYPE_AUTH >> 4) |
465                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
466                         BIT(IEEE80211_STYPE_ACTION >> 4),
467         },
468         [NL80211_IFTYPE_AP_VLAN] = {
469                 /* copy AP */
470                 .tx = 0xffff,
471                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
472                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
474                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
475                         BIT(IEEE80211_STYPE_AUTH >> 4) |
476                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
477                         BIT(IEEE80211_STYPE_ACTION >> 4),
478         },
479         [NL80211_IFTYPE_P2P_CLIENT] = {
480                 .tx = 0xffff,
481                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
482                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
483         },
484         [NL80211_IFTYPE_P2P_GO] = {
485                 .tx = 0xffff,
486                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
487                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
488                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
489                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
490                         BIT(IEEE80211_STYPE_AUTH >> 4) |
491                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
492                         BIT(IEEE80211_STYPE_ACTION >> 4),
493         },
494         [NL80211_IFTYPE_MESH_POINT] = {
495                 .tx = 0xffff,
496                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
497                         BIT(IEEE80211_STYPE_AUTH >> 4) |
498                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
499         },
500         [NL80211_IFTYPE_P2P_DEVICE] = {
501                 .tx = 0xffff,
502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
504         },
505 };
506 
507 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
508         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
509                              IEEE80211_HT_AMPDU_PARM_DENSITY,
510 
511         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
512                                 IEEE80211_HT_CAP_MAX_AMSDU |
513                                 IEEE80211_HT_CAP_SGI_20 |
514                                 IEEE80211_HT_CAP_SGI_40 |
515                                 IEEE80211_HT_CAP_TX_STBC |
516                                 IEEE80211_HT_CAP_RX_STBC |
517                                 IEEE80211_HT_CAP_LDPC_CODING |
518                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
519         .mcs = {
520                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
521                              0xff, 0xff, 0xff, 0xff, 0xff, },
522         },
523 };
524 
525 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
526         .vht_cap_info =
527                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
528                             IEEE80211_VHT_CAP_SHORT_GI_80 |
529                             IEEE80211_VHT_CAP_SHORT_GI_160 |
530                             IEEE80211_VHT_CAP_RXSTBC_MASK |
531                             IEEE80211_VHT_CAP_TXSTBC |
532                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
533                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
534                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
535                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
536                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
537         .supp_mcs = {
538                 .rx_mcs_map = cpu_to_le16(~0),
539                 .tx_mcs_map = cpu_to_le16(~0),
540         },
541 };
542 
543 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
544                                            const struct ieee80211_ops *ops,
545                                            const char *requested_name)
546 {
547         struct ieee80211_local *local;
548         int priv_size, i;
549         struct wiphy *wiphy;
550         bool use_chanctx;
551 
552         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
553                     !ops->add_interface || !ops->remove_interface ||
554                     !ops->configure_filter))
555                 return NULL;
556 
557         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
558                 return NULL;
559 
560         /* check all or no channel context operations exist */
561         i = !!ops->add_chanctx + !!ops->remove_chanctx +
562             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
563             !!ops->unassign_vif_chanctx;
564         if (WARN_ON(i != 0 && i != 5))
565                 return NULL;
566         use_chanctx = i == 5;
567 
568         /* Ensure 32-byte alignment of our private data and hw private data.
569          * We use the wiphy priv data for both our ieee80211_local and for
570          * the driver's private data
571          *
572          * In memory it'll be like this:
573          *
574          * +-------------------------+
575          * | struct wiphy           |
576          * +-------------------------+
577          * | struct ieee80211_local  |
578          * +-------------------------+
579          * | driver's private data   |
580          * +-------------------------+
581          *
582          */
583         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
584 
585         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
586 
587         if (!wiphy)
588                 return NULL;
589 
590         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
591 
592         wiphy->privid = mac80211_wiphy_privid;
593 
594         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
595                         WIPHY_FLAG_4ADDR_AP |
596                         WIPHY_FLAG_4ADDR_STATION |
597                         WIPHY_FLAG_REPORTS_OBSS |
598                         WIPHY_FLAG_OFFCHAN_TX;
599 
600         if (!use_chanctx || ops->remain_on_channel)
601                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
602 
603         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
604                            NL80211_FEATURE_SAE |
605                            NL80211_FEATURE_HT_IBSS |
606                            NL80211_FEATURE_VIF_TXPOWER |
607                            NL80211_FEATURE_MAC_ON_CREATE |
608                            NL80211_FEATURE_USERSPACE_MPM |
609                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
610         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
611         wiphy_ext_feature_set(wiphy,
612                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
613         wiphy_ext_feature_set(wiphy,
614                               NL80211_EXT_FEATURE_CONTROL_PORT_NO_PREAUTH);
615         wiphy_ext_feature_set(wiphy,
616                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS);
617         wiphy_ext_feature_set(wiphy,
618                               NL80211_EXT_FEATURE_SCAN_FREQ_KHZ);
619 
620         if (!ops->hw_scan) {
621                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
622                                    NL80211_FEATURE_AP_SCAN;
623                 /*
624                  * if the driver behaves correctly using the probe request
625                  * (template) from mac80211, then both of these should be
626                  * supported even with hw scan - but let drivers opt in.
627                  */
628                 wiphy_ext_feature_set(wiphy,
629                                       NL80211_EXT_FEATURE_SCAN_RANDOM_SN);
630                 wiphy_ext_feature_set(wiphy,
631                                       NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT);
632         }
633 
634         if (!ops->set_key)
635                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
636 
637         if (ops->wake_tx_queue)
638                 wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
639 
640         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
641 
642         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
643 
644         local = wiphy_priv(wiphy);
645 
646         if (sta_info_init(local))
647                 goto err_free;
648 
649         local->hw.wiphy = wiphy;
650 
651         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
652 
653         local->ops = ops;
654         local->use_chanctx = use_chanctx;
655 
656         /*
657          * We need a bit of data queued to build aggregates properly, so
658          * instruct the TCP stack to allow more than a single ms of data
659          * to be queued in the stack. The value is a bit-shift of 1
660          * second, so 7 is ~8ms of queued data. Only affects local TCP
661          * sockets.
662          * This is the default, anyhow - drivers may need to override it
663          * for local reasons (longer buffers, longer completion time, or
664          * similar).
665          */
666         local->hw.tx_sk_pacing_shift = 7;
667 
668         /* set up some defaults */
669         local->hw.queues = 1;
670         local->hw.max_rates = 1;
671         local->hw.max_report_rates = 0;
672         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
673         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
674         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
675         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
676         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
677         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
678                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
679                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
680         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
681                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
682         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
683         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
684         local->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
685         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
686         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
687         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
688 
689         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
690 
691         wiphy->extended_capabilities = local->ext_capa;
692         wiphy->extended_capabilities_mask = local->ext_capa;
693         wiphy->extended_capabilities_len =
694                 ARRAY_SIZE(local->ext_capa);
695 
696         INIT_LIST_HEAD(&local->interfaces);
697         INIT_LIST_HEAD(&local->mon_list);
698 
699         __hw_addr_init(&local->mc_list);
700 
701         mutex_init(&local->iflist_mtx);
702         mutex_init(&local->mtx);
703 
704         mutex_init(&local->key_mtx);
705         spin_lock_init(&local->filter_lock);
706         spin_lock_init(&local->rx_path_lock);
707         spin_lock_init(&local->queue_stop_reason_lock);
708 
709         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
710                 INIT_LIST_HEAD(&local->active_txqs[i]);
711                 spin_lock_init(&local->active_txq_lock[i]);
712                 local->aql_txq_limit_low[i] = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L;
713                 local->aql_txq_limit_high[i] =
714                         IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H;
715         }
716 
717         local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX;
718         local->aql_threshold = IEEE80211_AQL_THRESHOLD;
719         atomic_set(&local->aql_total_pending_airtime, 0);
720 
721         INIT_LIST_HEAD(&local->chanctx_list);
722         mutex_init(&local->chanctx_mtx);
723 
724         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
725 
726         INIT_WORK(&local->restart_work, ieee80211_restart_work);
727 
728         INIT_WORK(&local->radar_detected_work,
729                   ieee80211_dfs_radar_detected_work);
730 
731         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
732         local->smps_mode = IEEE80211_SMPS_OFF;
733 
734         INIT_WORK(&local->dynamic_ps_enable_work,
735                   ieee80211_dynamic_ps_enable_work);
736         INIT_WORK(&local->dynamic_ps_disable_work,
737                   ieee80211_dynamic_ps_disable_work);
738         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
739 
740         INIT_WORK(&local->sched_scan_stopped_work,
741                   ieee80211_sched_scan_stopped_work);
742 
743         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
744 
745         spin_lock_init(&local->ack_status_lock);
746         idr_init(&local->ack_status_frames);
747 
748         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
749                 skb_queue_head_init(&local->pending[i]);
750                 atomic_set(&local->agg_queue_stop[i], 0);
751         }
752         tasklet_setup(&local->tx_pending_tasklet, ieee80211_tx_pending);
753 
754         if (ops->wake_tx_queue)
755                 tasklet_setup(&local->wake_txqs_tasklet, ieee80211_wake_txqs);
756 
757         tasklet_setup(&local->tasklet, ieee80211_tasklet_handler);
758 
759         skb_queue_head_init(&local->skb_queue);
760         skb_queue_head_init(&local->skb_queue_unreliable);
761         skb_queue_head_init(&local->skb_queue_tdls_chsw);
762 
763         ieee80211_alloc_led_names(local);
764 
765         ieee80211_roc_setup(local);
766 
767         local->hw.radiotap_timestamp.units_pos = -1;
768         local->hw.radiotap_timestamp.accuracy = -1;
769 
770         return &local->hw;
771  err_free:
772         wiphy_free(wiphy);
773         return NULL;
774 }
775 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
776 
777 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
778 {
779         bool have_wep = !fips_enabled; /* FIPS does not permit the use of RC4 */
780         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
781         int n_suites = 0, r = 0, w = 0;
782         u32 *suites;
783         static const u32 cipher_suites[] = {
784                 /* keep WEP first, it may be removed below */
785                 WLAN_CIPHER_SUITE_WEP40,
786                 WLAN_CIPHER_SUITE_WEP104,
787                 WLAN_CIPHER_SUITE_TKIP,
788                 WLAN_CIPHER_SUITE_CCMP,
789                 WLAN_CIPHER_SUITE_CCMP_256,
790                 WLAN_CIPHER_SUITE_GCMP,
791                 WLAN_CIPHER_SUITE_GCMP_256,
792 
793                 /* keep last -- depends on hw flags! */
794                 WLAN_CIPHER_SUITE_AES_CMAC,
795                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
796                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
797                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
798         };
799 
800         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
801             local->hw.wiphy->cipher_suites) {
802                 /* If the driver advertises, or doesn't support SW crypto,
803                  * we only need to remove WEP if necessary.
804                  */
805                 if (have_wep)
806                         return 0;
807 
808                 /* well if it has _no_ ciphers ... fine */
809                 if (!local->hw.wiphy->n_cipher_suites)
810                         return 0;
811 
812                 /* Driver provides cipher suites, but we need to exclude WEP */
813                 suites = kmemdup(local->hw.wiphy->cipher_suites,
814                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
815                                  GFP_KERNEL);
816                 if (!suites)
817                         return -ENOMEM;
818 
819                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
820                         u32 suite = local->hw.wiphy->cipher_suites[r];
821 
822                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
823                             suite == WLAN_CIPHER_SUITE_WEP104)
824                                 continue;
825                         suites[w++] = suite;
826                 }
827         } else if (!local->hw.cipher_schemes) {
828                 /* If the driver doesn't have cipher schemes, there's nothing
829                  * else to do other than assign the (software supported and
830                  * perhaps offloaded) cipher suites.
831                  */
832                 local->hw.wiphy->cipher_suites = cipher_suites;
833                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
834 
835                 if (!have_mfp)
836                         local->hw.wiphy->n_cipher_suites -= 4;
837 
838                 if (!have_wep) {
839                         local->hw.wiphy->cipher_suites += 2;
840                         local->hw.wiphy->n_cipher_suites -= 2;
841                 }
842 
843                 /* not dynamically allocated, so just return */
844                 return 0;
845         } else {
846                 const struct ieee80211_cipher_scheme *cs;
847 
848                 cs = local->hw.cipher_schemes;
849 
850                 /* Driver specifies cipher schemes only (but not cipher suites
851                  * including the schemes)
852                  *
853                  * We start counting ciphers defined by schemes, TKIP, CCMP,
854                  * CCMP-256, GCMP, and GCMP-256
855                  */
856                 n_suites = local->hw.n_cipher_schemes + 5;
857 
858                 /* check if we have WEP40 and WEP104 */
859                 if (have_wep)
860                         n_suites += 2;
861 
862                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
863                  * BIP-GMAC-256
864                  */
865                 if (have_mfp)
866                         n_suites += 4;
867 
868                 suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
869                 if (!suites)
870                         return -ENOMEM;
871 
872                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
873                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
874                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
875                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
876                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
877 
878                 if (have_wep) {
879                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
880                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
881                 }
882 
883                 if (have_mfp) {
884                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
885                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
886                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
887                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
888                 }
889 
890                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
891                         suites[w++] = cs[r].cipher;
892                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
893                                 kfree(suites);
894                                 return -EINVAL;
895                         }
896                 }
897         }
898 
899         local->hw.wiphy->cipher_suites = suites;
900         local->hw.wiphy->n_cipher_suites = w;
901         local->wiphy_ciphers_allocated = true;
902 
903         return 0;
904 }
905 
906 int ieee80211_register_hw(struct ieee80211_hw *hw)
907 {
908         struct ieee80211_local *local = hw_to_local(hw);
909         int result, i;
910         enum nl80211_band band;
911         int channels, max_bitrates;
912         bool supp_ht, supp_vht, supp_he;
913         struct cfg80211_chan_def dflt_chandef = {};
914 
915         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
916             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
917              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
918                 return -EINVAL;
919 
920         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
921             (!local->ops->tdls_channel_switch ||
922              !local->ops->tdls_cancel_channel_switch ||
923              !local->ops->tdls_recv_channel_switch))
924                 return -EOPNOTSUPP;
925 
926         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
927                     !local->ops->set_frag_threshold))
928                 return -EINVAL;
929 
930         if (WARN_ON(local->hw.wiphy->interface_modes &
931                         BIT(NL80211_IFTYPE_NAN) &&
932                     (!local->ops->start_nan || !local->ops->stop_nan)))
933                 return -EINVAL;
934 
935 #ifdef CONFIG_PM
936         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
937                 return -EINVAL;
938 #endif
939 
940         if (!local->use_chanctx) {
941                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
942                         const struct ieee80211_iface_combination *comb;
943 
944                         comb = &local->hw.wiphy->iface_combinations[i];
945 
946                         if (comb->num_different_channels > 1)
947                                 return -EINVAL;
948                 }
949         } else {
950                 /* DFS is not supported with multi-channel combinations yet */
951                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
952                         const struct ieee80211_iface_combination *comb;
953 
954                         comb = &local->hw.wiphy->iface_combinations[i];
955 
956                         if (comb->radar_detect_widths &&
957                             comb->num_different_channels > 1)
958                                 return -EINVAL;
959                 }
960         }
961 
962         /* Only HW csum features are currently compatible with mac80211 */
963         if (WARN_ON(hw->netdev_features & ~MAC80211_SUPPORTED_FEATURES))
964                 return -EINVAL;
965 
966         if (hw->max_report_rates == 0)
967                 hw->max_report_rates = hw->max_rates;
968 
969         local->rx_chains = 1;
970 
971         /*
972          * generic code guarantees at least one band,
973          * set this very early because much code assumes
974          * that hw.conf.channel is assigned
975          */
976         channels = 0;
977         max_bitrates = 0;
978         supp_ht = false;
979         supp_vht = false;
980         supp_he = false;
981         for (band = 0; band < NUM_NL80211_BANDS; band++) {
982                 struct ieee80211_supported_band *sband;
983 
984                 sband = local->hw.wiphy->bands[band];
985                 if (!sband)
986                         continue;
987 
988                 if (!dflt_chandef.chan) {
989                         /*
990                          * Assign the first enabled channel to dflt_chandef
991                          * from the list of channels
992                          */
993                         for (i = 0; i < sband->n_channels; i++)
994                                 if (!(sband->channels[i].flags &
995                                                 IEEE80211_CHAN_DISABLED))
996                                         break;
997                         /* if none found then use the first anyway */
998                         if (i == sband->n_channels)
999                                 i = 0;
1000                         cfg80211_chandef_create(&dflt_chandef,
1001                                                 &sband->channels[i],
1002                                                 NL80211_CHAN_NO_HT);
1003                         /* init channel we're on */
1004                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
1005                                 local->hw.conf.chandef = dflt_chandef;
1006                                 local->_oper_chandef = dflt_chandef;
1007                         }
1008                         local->monitor_chandef = dflt_chandef;
1009                 }
1010 
1011                 channels += sband->n_channels;
1012 
1013                 if (max_bitrates < sband->n_bitrates)
1014                         max_bitrates = sband->n_bitrates;
1015                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
1016                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1017 
1018                 if (!supp_he)
1019                         supp_he = !!ieee80211_get_he_sta_cap(sband);
1020 
1021                 /* HT, VHT, HE require QoS, thus >= 4 queues */
1022                 if (WARN_ON(local->hw.queues < IEEE80211_NUM_ACS &&
1023                             (supp_ht || supp_vht || supp_he)))
1024                         return -EINVAL;
1025 
1026                 if (!sband->ht_cap.ht_supported)
1027                         continue;
1028 
1029                 /* TODO: consider VHT for RX chains, hopefully it's the same */
1030                 local->rx_chains =
1031                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
1032                             local->rx_chains);
1033 
1034                 /* no need to mask, SM_PS_DISABLED has all bits set */
1035                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
1036                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
1037         }
1038 
1039         /* if low-level driver supports AP, we also support VLAN.
1040          * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
1041          * based on their support to transmit SW encrypted packets.
1042          */
1043         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
1044             !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
1045                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1046                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
1047         }
1048 
1049         /* mac80211 always supports monitor */
1050         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1051         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
1052 
1053         /* mac80211 doesn't support more than one IBSS interface right now */
1054         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
1055                 const struct ieee80211_iface_combination *c;
1056                 int j;
1057 
1058                 c = &hw->wiphy->iface_combinations[i];
1059 
1060                 for (j = 0; j < c->n_limits; j++)
1061                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
1062                             c->limits[j].max > 1)
1063                                 return -EINVAL;
1064         }
1065 
1066         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
1067                                       sizeof(void *) * channels, GFP_KERNEL);
1068         if (!local->int_scan_req)
1069                 return -ENOMEM;
1070 
1071         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1072                 if (!local->hw.wiphy->bands[band])
1073                         continue;
1074                 local->int_scan_req->rates[band] = (u32) -1;
1075         }
1076 
1077 #ifndef CONFIG_MAC80211_MESH
1078         /* mesh depends on Kconfig, but drivers should set it if they want */
1079         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
1080 #endif
1081 
1082         /* if the underlying driver supports mesh, mac80211 will (at least)
1083          * provide routing of mesh authentication frames to userspace */
1084         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
1085                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
1086 
1087         /* mac80211 supports control port protocol changing */
1088         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
1089 
1090         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
1091                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
1092         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
1093                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
1094                 if (hw->max_signal <= 0) {
1095                         result = -EINVAL;
1096                         goto fail_workqueue;
1097                 }
1098         }
1099 
1100         /* Mac80211 and therefore all drivers using SW crypto only
1101          * are able to handle PTK rekeys and Extended Key ID.
1102          */
1103         if (!local->ops->set_key) {
1104                 wiphy_ext_feature_set(local->hw.wiphy,
1105                                       NL80211_EXT_FEATURE_CAN_REPLACE_PTK0);
1106                 wiphy_ext_feature_set(local->hw.wiphy,
1107                                       NL80211_EXT_FEATURE_EXT_KEY_ID);
1108         }
1109 
1110         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_ADHOC))
1111                 wiphy_ext_feature_set(local->hw.wiphy,
1112                                       NL80211_EXT_FEATURE_DEL_IBSS_STA);
1113 
1114         /*
1115          * Calculate scan IE length -- we need this to alloc
1116          * memory and to subtract from the driver limit. It
1117          * includes the DS Params, (extended) supported rates, and HT
1118          * information -- SSID is the driver's responsibility.
1119          */
1120         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1121                 3 /* DS Params */;
1122         if (supp_ht)
1123                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1124 
1125         if (supp_vht)
1126                 local->scan_ies_len +=
1127                         2 + sizeof(struct ieee80211_vht_cap);
1128 
1129         /* HE cap element is variable in size - set len to allow max size */
1130         /*
1131          * TODO: 1 is added at the end of the calculation to accommodate for
1132          *      the temporary placing of the HE capabilities IE under EXT.
1133          *      Remove it once it is placed in the final place.
1134          */
1135         if (supp_he)
1136                 local->scan_ies_len +=
1137                         2 + sizeof(struct ieee80211_he_cap_elem) +
1138                         sizeof(struct ieee80211_he_mcs_nss_supp) +
1139                         IEEE80211_HE_PPE_THRES_MAX_LEN + 1;
1140 
1141         if (!local->ops->hw_scan) {
1142                 /* For hw_scan, driver needs to set these up. */
1143                 local->hw.wiphy->max_scan_ssids = 4;
1144                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1145         }
1146 
1147         /*
1148          * If the driver supports any scan IEs, then assume the
1149          * limit includes the IEs mac80211 will add, otherwise
1150          * leave it at zero and let the driver sort it out; we
1151          * still pass our IEs to the driver but userspace will
1152          * not be allowed to in that case.
1153          */
1154         if (local->hw.wiphy->max_scan_ie_len)
1155                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1156 
1157         if (WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1158                                              local->hw.n_cipher_schemes))) {
1159                 result = -EINVAL;
1160                 goto fail_workqueue;
1161         }
1162 
1163         result = ieee80211_init_cipher_suites(local);
1164         if (result < 0)
1165                 goto fail_workqueue;
1166 
1167         if (!local->ops->remain_on_channel)
1168                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1169 
1170         /* mac80211 based drivers don't support internal TDLS setup */
1171         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1172                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1173 
1174         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1175         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1176                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1177 
1178         /* mac80211 supports multi BSSID, if the driver supports it */
1179         if (ieee80211_hw_check(&local->hw, SUPPORTS_MULTI_BSSID)) {
1180                 local->hw.wiphy->support_mbssid = true;
1181                 if (ieee80211_hw_check(&local->hw,
1182                                        SUPPORTS_ONLY_HE_MULTI_BSSID))
1183                         local->hw.wiphy->support_only_he_mbssid = true;
1184                 else
1185                         local->ext_capa[2] |=
1186                                 WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
1187         }
1188 
1189         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
1190 
1191         /*
1192          * We use the number of queues for feature tests (QoS, HT) internally
1193          * so restrict them appropriately.
1194          */
1195         if (hw->queues > IEEE80211_MAX_QUEUES)
1196                 hw->queues = IEEE80211_MAX_QUEUES;
1197 
1198         local->workqueue =
1199                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1200         if (!local->workqueue) {
1201                 result = -ENOMEM;
1202                 goto fail_workqueue;
1203         }
1204 
1205         /*
1206          * The hardware needs headroom for sending the frame,
1207          * and we need some headroom for passing the frame to monitor
1208          * interfaces, but never both at the same time.
1209          */
1210         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1211                                    IEEE80211_TX_STATUS_HEADROOM);
1212 
1213         /*
1214          * if the driver doesn't specify a max listen interval we
1215          * use 5 which should be a safe default
1216          */
1217         if (local->hw.max_listen_interval == 0)
1218                 local->hw.max_listen_interval = 5;
1219 
1220         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1221 
1222         local->dynamic_ps_forced_timeout = -1;
1223 
1224         if (!local->hw.max_nan_de_entries)
1225                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1226 
1227         if (!local->hw.weight_multiplier)
1228                 local->hw.weight_multiplier = 1;
1229 
1230         ieee80211_wep_init(local);
1231 
1232         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1233 
1234         ieee80211_led_init(local);
1235 
1236         result = ieee80211_txq_setup_flows(local);
1237         if (result)
1238                 goto fail_flows;
1239 
1240         rtnl_lock();
1241         result = ieee80211_init_rate_ctrl_alg(local,
1242                                               hw->rate_control_algorithm);
1243         rtnl_unlock();
1244         if (result < 0) {
1245                 wiphy_debug(local->hw.wiphy,
1246                             "Failed to initialize rate control algorithm\n");
1247                 goto fail_rate;
1248         }
1249 
1250         if (local->rate_ctrl) {
1251                 clear_bit(IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW, hw->flags);
1252                 if (local->rate_ctrl->ops->capa & RATE_CTRL_CAPA_VHT_EXT_NSS_BW)
1253                         ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW);
1254         }
1255 
1256         /*
1257          * If the VHT capabilities don't have IEEE80211_VHT_EXT_NSS_BW_CAPABLE,
1258          * or have it when we don't, copy the sband structure and set/clear it.
1259          * This is necessary because rate scaling algorithms could be switched
1260          * and have different support values.
1261          * Print a message so that in the common case the reallocation can be
1262          * avoided.
1263          */
1264         BUILD_BUG_ON(NUM_NL80211_BANDS > 8 * sizeof(local->sband_allocated));
1265         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1266                 struct ieee80211_supported_band *sband;
1267                 bool local_cap, ie_cap;
1268 
1269                 local_cap = ieee80211_hw_check(hw, SUPPORTS_VHT_EXT_NSS_BW);
1270 
1271                 sband = local->hw.wiphy->bands[band];
1272                 if (!sband || !sband->vht_cap.vht_supported)
1273                         continue;
1274 
1275                 ie_cap = !!(sband->vht_cap.vht_mcs.tx_highest &
1276                             cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE));
1277 
1278                 if (local_cap == ie_cap)
1279                         continue;
1280 
1281                 sband = kmemdup(sband, sizeof(*sband), GFP_KERNEL);
1282                 if (!sband) {
1283                         result = -ENOMEM;
1284                         goto fail_rate;
1285                 }
1286 
1287                 wiphy_dbg(hw->wiphy, "copying sband (band %d) due to VHT EXT NSS BW flag\n",
1288                           band);
1289 
1290                 sband->vht_cap.vht_mcs.tx_highest ^=
1291                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
1292 
1293                 local->hw.wiphy->bands[band] = sband;
1294                 local->sband_allocated |= BIT(band);
1295         }
1296 
1297         result = wiphy_register(local->hw.wiphy);
1298         if (result < 0)
1299                 goto fail_wiphy_register;
1300 
1301         debugfs_hw_add(local);
1302         rate_control_add_debugfs(local);
1303 
1304         rtnl_lock();
1305         wiphy_lock(hw->wiphy);
1306 
1307         /* add one default STA interface if supported */
1308         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1309             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1310                 struct vif_params params = {0};
1311 
1312                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1313                                           NL80211_IFTYPE_STATION, &params);
1314                 if (result)
1315                         wiphy_warn(local->hw.wiphy,
1316                                    "Failed to add default virtual iface\n");
1317         }
1318 
1319         wiphy_unlock(hw->wiphy);
1320         rtnl_unlock();
1321 
1322 #ifdef CONFIG_INET
1323         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1324         result = register_inetaddr_notifier(&local->ifa_notifier);
1325         if (result)
1326                 goto fail_ifa;
1327 #endif
1328 
1329 #if IS_ENABLED(CONFIG_IPV6)
1330         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1331         result = register_inet6addr_notifier(&local->ifa6_notifier);
1332         if (result)
1333                 goto fail_ifa6;
1334 #endif
1335 
1336         return 0;
1337 
1338 #if IS_ENABLED(CONFIG_IPV6)
1339  fail_ifa6:
1340 #ifdef CONFIG_INET
1341         unregister_inetaddr_notifier(&local->ifa_notifier);
1342 #endif
1343 #endif
1344 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1345  fail_ifa:
1346 #endif
1347         wiphy_unregister(local->hw.wiphy);
1348  fail_wiphy_register:
1349         rtnl_lock();
1350         rate_control_deinitialize(local);
1351         ieee80211_remove_interfaces(local);
1352         rtnl_unlock();
1353  fail_rate:
1354  fail_flows:
1355         ieee80211_led_exit(local);
1356         destroy_workqueue(local->workqueue);
1357  fail_workqueue:
1358         if (local->wiphy_ciphers_allocated)
1359                 kfree(local->hw.wiphy->cipher_suites);
1360         kfree(local->int_scan_req);
1361         return result;
1362 }
1363 EXPORT_SYMBOL(ieee80211_register_hw);
1364 
1365 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1366 {
1367         struct ieee80211_local *local = hw_to_local(hw);
1368 
1369         tasklet_kill(&local->tx_pending_tasklet);
1370         tasklet_kill(&local->tasklet);
1371 
1372 #ifdef CONFIG_INET
1373         unregister_inetaddr_notifier(&local->ifa_notifier);
1374 #endif
1375 #if IS_ENABLED(CONFIG_IPV6)
1376         unregister_inet6addr_notifier(&local->ifa6_notifier);
1377 #endif
1378 
1379         rtnl_lock();
1380 
1381         /*
1382          * At this point, interface list manipulations are fine
1383          * because the driver cannot be handing us frames any
1384          * more and the tasklet is killed.
1385          */
1386         ieee80211_remove_interfaces(local);
1387 
1388         rtnl_unlock();
1389 
1390         cancel_delayed_work_sync(&local->roc_work);
1391         cancel_work_sync(&local->restart_work);
1392         cancel_work_sync(&local->reconfig_filter);
1393         cancel_work_sync(&local->tdls_chsw_work);
1394         flush_work(&local->sched_scan_stopped_work);
1395         flush_work(&local->radar_detected_work);
1396 
1397         ieee80211_clear_tx_pending(local);
1398         rate_control_deinitialize(local);
1399 
1400         if (skb_queue_len(&local->skb_queue) ||
1401             skb_queue_len(&local->skb_queue_unreliable))
1402                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1403         skb_queue_purge(&local->skb_queue);
1404         skb_queue_purge(&local->skb_queue_unreliable);
1405         skb_queue_purge(&local->skb_queue_tdls_chsw);
1406 
1407         wiphy_unregister(local->hw.wiphy);
1408         destroy_workqueue(local->workqueue);
1409         ieee80211_led_exit(local);
1410         kfree(local->int_scan_req);
1411 }
1412 EXPORT_SYMBOL(ieee80211_unregister_hw);
1413 
1414 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1415 {
1416         WARN_ONCE(1, "Have pending ack frames!\n");
1417         kfree_skb(p);
1418         return 0;
1419 }
1420 
1421 void ieee80211_free_hw(struct ieee80211_hw *hw)
1422 {
1423         struct ieee80211_local *local = hw_to_local(hw);
1424         enum nl80211_band band;
1425 
1426         mutex_destroy(&local->iflist_mtx);
1427         mutex_destroy(&local->mtx);
1428 
1429         if (local->wiphy_ciphers_allocated)
1430                 kfree(local->hw.wiphy->cipher_suites);
1431 
1432         idr_for_each(&local->ack_status_frames,
1433                      ieee80211_free_ack_frame, NULL);
1434         idr_destroy(&local->ack_status_frames);
1435 
1436         sta_info_stop(local);
1437 
1438         ieee80211_free_led_names(local);
1439 
1440         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1441                 if (!(local->sband_allocated & BIT(band)))
1442                         continue;
1443                 kfree(local->hw.wiphy->bands[band]);
1444         }
1445 
1446         wiphy_free(local->hw.wiphy);
1447 }
1448 EXPORT_SYMBOL(ieee80211_free_hw);
1449 
1450 static int __init ieee80211_init(void)
1451 {
1452         struct sk_buff *skb;
1453         int ret;
1454 
1455         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1456         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1457                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1458 
1459         ret = rc80211_minstrel_init();
1460         if (ret)
1461                 return ret;
1462 
1463         ret = ieee80211_iface_init();
1464         if (ret)
1465                 goto err_netdev;
1466 
1467         return 0;
1468  err_netdev:
1469         rc80211_minstrel_exit();
1470 
1471         return ret;
1472 }
1473 
1474 static void __exit ieee80211_exit(void)
1475 {
1476         rc80211_minstrel_exit();
1477 
1478         ieee80211s_stop();
1479 
1480         ieee80211_iface_exit();
1481 
1482         rcu_barrier();
1483 }
1484 
1485 
1486 subsys_initcall(ieee80211_init);
1487 module_exit(ieee80211_exit);
1488 
1489 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1490 MODULE_LICENSE("GPL");
1491 

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