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TOMOYO Linux Cross Reference
Linux/net/mac80211/main.c

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <net/mac80211.h>
 12 #include <linux/module.h>
 13 #include <linux/init.h>
 14 #include <linux/netdevice.h>
 15 #include <linux/types.h>
 16 #include <linux/slab.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/etherdevice.h>
 19 #include <linux/if_arp.h>
 20 #include <linux/rtnetlink.h>
 21 #include <linux/bitmap.h>
 22 #include <linux/pm_qos.h>
 23 #include <linux/inetdevice.h>
 24 #include <net/net_namespace.h>
 25 #include <net/cfg80211.h>
 26 #include <net/addrconf.h>
 27 
 28 #include "ieee80211_i.h"
 29 #include "driver-ops.h"
 30 #include "rate.h"
 31 #include "mesh.h"
 32 #include "wep.h"
 33 #include "led.h"
 34 #include "cfg.h"
 35 #include "debugfs.h"
 36 
 37 void ieee80211_configure_filter(struct ieee80211_local *local)
 38 {
 39         u64 mc;
 40         unsigned int changed_flags;
 41         unsigned int new_flags = 0;
 42 
 43         if (atomic_read(&local->iff_promiscs))
 44                 new_flags |= FIF_PROMISC_IN_BSS;
 45 
 46         if (atomic_read(&local->iff_allmultis))
 47                 new_flags |= FIF_ALLMULTI;
 48 
 49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 50             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
 51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
 52 
 53         if (local->fif_probe_req || local->probe_req_reg)
 54                 new_flags |= FIF_PROBE_REQ;
 55 
 56         if (local->fif_fcsfail)
 57                 new_flags |= FIF_FCSFAIL;
 58 
 59         if (local->fif_plcpfail)
 60                 new_flags |= FIF_PLCPFAIL;
 61 
 62         if (local->fif_control)
 63                 new_flags |= FIF_CONTROL;
 64 
 65         if (local->fif_other_bss)
 66                 new_flags |= FIF_OTHER_BSS;
 67 
 68         if (local->fif_pspoll)
 69                 new_flags |= FIF_PSPOLL;
 70 
 71         spin_lock_bh(&local->filter_lock);
 72         changed_flags = local->filter_flags ^ new_flags;
 73 
 74         mc = drv_prepare_multicast(local, &local->mc_list);
 75         spin_unlock_bh(&local->filter_lock);
 76 
 77         /* be a bit nasty */
 78         new_flags |= (1<<31);
 79 
 80         drv_configure_filter(local, changed_flags, &new_flags, mc);
 81 
 82         WARN_ON(new_flags & (1<<31));
 83 
 84         local->filter_flags = new_flags & ~(1<<31);
 85 }
 86 
 87 static void ieee80211_reconfig_filter(struct work_struct *work)
 88 {
 89         struct ieee80211_local *local =
 90                 container_of(work, struct ieee80211_local, reconfig_filter);
 91 
 92         ieee80211_configure_filter(local);
 93 }
 94 
 95 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 96 {
 97         struct ieee80211_sub_if_data *sdata;
 98         struct cfg80211_chan_def chandef = {};
 99         u32 changed = 0;
100         int power;
101         u32 offchannel_flag;
102 
103         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
104 
105         if (local->scan_channel) {
106                 chandef.chan = local->scan_channel;
107                 /* If scanning on oper channel, use whatever channel-type
108                  * is currently in use.
109                  */
110                 if (chandef.chan == local->_oper_chandef.chan) {
111                         chandef = local->_oper_chandef;
112                 } else {
113                         chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
114                         chandef.center_freq1 = chandef.chan->center_freq;
115                 }
116         } else if (local->tmp_channel) {
117                 chandef.chan = local->tmp_channel;
118                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
119                 chandef.center_freq1 = chandef.chan->center_freq;
120         } else
121                 chandef = local->_oper_chandef;
122 
123         WARN(!cfg80211_chandef_valid(&chandef),
124              "control:%d MHz width:%d center: %d/%d MHz",
125              chandef.chan->center_freq, chandef.width,
126              chandef.center_freq1, chandef.center_freq2);
127 
128         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
129                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
130         else
131                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
132 
133         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
134 
135         if (offchannel_flag ||
136             !cfg80211_chandef_identical(&local->hw.conf.chandef,
137                                         &local->_oper_chandef)) {
138                 local->hw.conf.chandef = chandef;
139                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
140         }
141 
142         if (!conf_is_ht(&local->hw.conf)) {
143                 /*
144                  * mac80211.h documents that this is only valid
145                  * when the channel is set to an HT type, and
146                  * that otherwise STATIC is used.
147                  */
148                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
149         } else if (local->hw.conf.smps_mode != local->smps_mode) {
150                 local->hw.conf.smps_mode = local->smps_mode;
151                 changed |= IEEE80211_CONF_CHANGE_SMPS;
152         }
153 
154         power = chandef.chan->max_power;
155 
156         rcu_read_lock();
157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
159                         continue;
160                 power = min(power, sdata->vif.bss_conf.txpower);
161         }
162         rcu_read_unlock();
163 
164         if (local->hw.conf.power_level != power) {
165                 changed |= IEEE80211_CONF_CHANGE_POWER;
166                 local->hw.conf.power_level = power;
167         }
168 
169         return changed;
170 }
171 
172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
173 {
174         int ret = 0;
175 
176         might_sleep();
177 
178         if (!local->use_chanctx)
179                 changed |= ieee80211_hw_conf_chan(local);
180         else
181                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
182                              IEEE80211_CONF_CHANGE_POWER);
183 
184         if (changed && local->open_count) {
185                 ret = drv_config(local, changed);
186                 /*
187                  * Goal:
188                  * HW reconfiguration should never fail, the driver has told
189                  * us what it can support so it should live up to that promise.
190                  *
191                  * Current status:
192                  * rfkill is not integrated with mac80211 and a
193                  * configuration command can thus fail if hardware rfkill
194                  * is enabled
195                  *
196                  * FIXME: integrate rfkill with mac80211 and then add this
197                  * WARN_ON() back
198                  *
199                  */
200                 /* WARN_ON(ret); */
201         }
202 
203         return ret;
204 }
205 
206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
207                                       u32 changed)
208 {
209         struct ieee80211_local *local = sdata->local;
210 
211         if (!changed)
212                 return;
213 
214         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
215 }
216 
217 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
218 {
219         sdata->vif.bss_conf.use_cts_prot = false;
220         sdata->vif.bss_conf.use_short_preamble = false;
221         sdata->vif.bss_conf.use_short_slot = false;
222         return BSS_CHANGED_ERP_CTS_PROT |
223                BSS_CHANGED_ERP_PREAMBLE |
224                BSS_CHANGED_ERP_SLOT;
225 }
226 
227 static void ieee80211_tasklet_handler(unsigned long data)
228 {
229         struct ieee80211_local *local = (struct ieee80211_local *) data;
230         struct sk_buff *skb;
231 
232         while ((skb = skb_dequeue(&local->skb_queue)) ||
233                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
234                 switch (skb->pkt_type) {
235                 case IEEE80211_RX_MSG:
236                         /* Clear skb->pkt_type in order to not confuse kernel
237                          * netstack. */
238                         skb->pkt_type = 0;
239                         ieee80211_rx(&local->hw, skb);
240                         break;
241                 case IEEE80211_TX_STATUS_MSG:
242                         skb->pkt_type = 0;
243                         ieee80211_tx_status(&local->hw, skb);
244                         break;
245                 default:
246                         WARN(1, "mac80211: Packet is of unknown type %d\n",
247                              skb->pkt_type);
248                         dev_kfree_skb(skb);
249                         break;
250                 }
251         }
252 }
253 
254 static void ieee80211_restart_work(struct work_struct *work)
255 {
256         struct ieee80211_local *local =
257                 container_of(work, struct ieee80211_local, restart_work);
258 
259         /* wait for scan work complete */
260         flush_workqueue(local->workqueue);
261 
262         mutex_lock(&local->mtx);
263         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
264              rcu_dereference_protected(local->sched_scan_sdata,
265                                        lockdep_is_held(&local->mtx)),
266                 "%s called with hardware scan in progress\n", __func__);
267         mutex_unlock(&local->mtx);
268 
269         rtnl_lock();
270         ieee80211_scan_cancel(local);
271         ieee80211_reconfig(local);
272         rtnl_unlock();
273 }
274 
275 void ieee80211_restart_hw(struct ieee80211_hw *hw)
276 {
277         struct ieee80211_local *local = hw_to_local(hw);
278 
279         trace_api_restart_hw(local);
280 
281         wiphy_info(hw->wiphy,
282                    "Hardware restart was requested\n");
283 
284         /* use this reason, ieee80211_reconfig will unblock it */
285         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
286                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
287 
288         /*
289          * Stop all Rx during the reconfig. We don't want state changes
290          * or driver callbacks while this is in progress.
291          */
292         local->in_reconfig = true;
293         barrier();
294 
295         schedule_work(&local->restart_work);
296 }
297 EXPORT_SYMBOL(ieee80211_restart_hw);
298 
299 #ifdef CONFIG_INET
300 static int ieee80211_ifa_changed(struct notifier_block *nb,
301                                  unsigned long data, void *arg)
302 {
303         struct in_ifaddr *ifa = arg;
304         struct ieee80211_local *local =
305                 container_of(nb, struct ieee80211_local,
306                              ifa_notifier);
307         struct net_device *ndev = ifa->ifa_dev->dev;
308         struct wireless_dev *wdev = ndev->ieee80211_ptr;
309         struct in_device *idev;
310         struct ieee80211_sub_if_data *sdata;
311         struct ieee80211_bss_conf *bss_conf;
312         struct ieee80211_if_managed *ifmgd;
313         int c = 0;
314 
315         /* Make sure it's our interface that got changed */
316         if (!wdev)
317                 return NOTIFY_DONE;
318 
319         if (wdev->wiphy != local->hw.wiphy)
320                 return NOTIFY_DONE;
321 
322         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
323         bss_conf = &sdata->vif.bss_conf;
324 
325         /* ARP filtering is only supported in managed mode */
326         if (sdata->vif.type != NL80211_IFTYPE_STATION)
327                 return NOTIFY_DONE;
328 
329         idev = __in_dev_get_rtnl(sdata->dev);
330         if (!idev)
331                 return NOTIFY_DONE;
332 
333         ifmgd = &sdata->u.mgd;
334         sdata_lock(sdata);
335 
336         /* Copy the addresses to the bss_conf list */
337         ifa = idev->ifa_list;
338         while (ifa) {
339                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
340                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
341                 ifa = ifa->ifa_next;
342                 c++;
343         }
344 
345         bss_conf->arp_addr_cnt = c;
346 
347         /* Configure driver only if associated (which also implies it is up) */
348         if (ifmgd->associated)
349                 ieee80211_bss_info_change_notify(sdata,
350                                                  BSS_CHANGED_ARP_FILTER);
351 
352         sdata_unlock(sdata);
353 
354         return NOTIFY_DONE;
355 }
356 #endif
357 
358 #if IS_ENABLED(CONFIG_IPV6)
359 static int ieee80211_ifa6_changed(struct notifier_block *nb,
360                                   unsigned long data, void *arg)
361 {
362         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
363         struct inet6_dev *idev = ifa->idev;
364         struct net_device *ndev = ifa->idev->dev;
365         struct ieee80211_local *local =
366                 container_of(nb, struct ieee80211_local, ifa6_notifier);
367         struct wireless_dev *wdev = ndev->ieee80211_ptr;
368         struct ieee80211_sub_if_data *sdata;
369 
370         /* Make sure it's our interface that got changed */
371         if (!wdev || wdev->wiphy != local->hw.wiphy)
372                 return NOTIFY_DONE;
373 
374         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
375 
376         /*
377          * For now only support station mode. This is mostly because
378          * doing AP would have to handle AP_VLAN in some way ...
379          */
380         if (sdata->vif.type != NL80211_IFTYPE_STATION)
381                 return NOTIFY_DONE;
382 
383         drv_ipv6_addr_change(local, sdata, idev);
384 
385         return NOTIFY_DONE;
386 }
387 #endif
388 
389 /* There isn't a lot of sense in it, but you can transmit anything you like */
390 static const struct ieee80211_txrx_stypes
391 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
392         [NL80211_IFTYPE_ADHOC] = {
393                 .tx = 0xffff,
394                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
395                         BIT(IEEE80211_STYPE_AUTH >> 4) |
396                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
398         },
399         [NL80211_IFTYPE_STATION] = {
400                 .tx = 0xffff,
401                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
402                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
403         },
404         [NL80211_IFTYPE_AP] = {
405                 .tx = 0xffff,
406                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
407                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
408                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
409                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
412                         BIT(IEEE80211_STYPE_ACTION >> 4),
413         },
414         [NL80211_IFTYPE_AP_VLAN] = {
415                 /* copy AP */
416                 .tx = 0xffff,
417                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
418                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
419                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
420                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
421                         BIT(IEEE80211_STYPE_AUTH >> 4) |
422                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
423                         BIT(IEEE80211_STYPE_ACTION >> 4),
424         },
425         [NL80211_IFTYPE_P2P_CLIENT] = {
426                 .tx = 0xffff,
427                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
428                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
429         },
430         [NL80211_IFTYPE_P2P_GO] = {
431                 .tx = 0xffff,
432                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
433                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
434                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
435                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
438                         BIT(IEEE80211_STYPE_ACTION >> 4),
439         },
440         [NL80211_IFTYPE_MESH_POINT] = {
441                 .tx = 0xffff,
442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
443                         BIT(IEEE80211_STYPE_AUTH >> 4) |
444                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
445         },
446         [NL80211_IFTYPE_P2P_DEVICE] = {
447                 .tx = 0xffff,
448                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
450         },
451 };
452 
453 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
454         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
455                              IEEE80211_HT_AMPDU_PARM_DENSITY,
456 
457         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
458                                 IEEE80211_HT_CAP_MAX_AMSDU |
459                                 IEEE80211_HT_CAP_SGI_20 |
460                                 IEEE80211_HT_CAP_SGI_40),
461         .mcs = {
462                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
463                              0xff, 0xff, 0xff, 0xff, 0xff, },
464         },
465 };
466 
467 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
468         .vht_cap_info =
469                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
470                             IEEE80211_VHT_CAP_SHORT_GI_80 |
471                             IEEE80211_VHT_CAP_SHORT_GI_160 |
472                             IEEE80211_VHT_CAP_RXSTBC_1 |
473                             IEEE80211_VHT_CAP_RXSTBC_2 |
474                             IEEE80211_VHT_CAP_RXSTBC_3 |
475                             IEEE80211_VHT_CAP_RXSTBC_4 |
476                             IEEE80211_VHT_CAP_TXSTBC |
477                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
478                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
479                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
480                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
481                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
482         .supp_mcs = {
483                 .rx_mcs_map = cpu_to_le16(~0),
484                 .tx_mcs_map = cpu_to_le16(~0),
485         },
486 };
487 
488 static const u8 extended_capabilities[] = {
489         0, 0, 0, 0, 0, 0, 0,
490         WLAN_EXT_CAPA8_OPMODE_NOTIF,
491 };
492 
493 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
494                                         const struct ieee80211_ops *ops)
495 {
496         struct ieee80211_local *local;
497         int priv_size, i;
498         struct wiphy *wiphy;
499         bool use_chanctx;
500 
501         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
502                     !ops->add_interface || !ops->remove_interface ||
503                     !ops->configure_filter))
504                 return NULL;
505 
506         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
507                 return NULL;
508 
509         /* check all or no channel context operations exist */
510         i = !!ops->add_chanctx + !!ops->remove_chanctx +
511             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
512             !!ops->unassign_vif_chanctx;
513         if (WARN_ON(i != 0 && i != 5))
514                 return NULL;
515         use_chanctx = i == 5;
516 
517         /* Ensure 32-byte alignment of our private data and hw private data.
518          * We use the wiphy priv data for both our ieee80211_local and for
519          * the driver's private data
520          *
521          * In memory it'll be like this:
522          *
523          * +-------------------------+
524          * | struct wiphy           |
525          * +-------------------------+
526          * | struct ieee80211_local  |
527          * +-------------------------+
528          * | driver's private data   |
529          * +-------------------------+
530          *
531          */
532         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
533 
534         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
535 
536         if (!wiphy)
537                 return NULL;
538 
539         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
540 
541         wiphy->privid = mac80211_wiphy_privid;
542 
543         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
544                         WIPHY_FLAG_4ADDR_AP |
545                         WIPHY_FLAG_4ADDR_STATION |
546                         WIPHY_FLAG_REPORTS_OBSS |
547                         WIPHY_FLAG_OFFCHAN_TX;
548 
549         wiphy->extended_capabilities = extended_capabilities;
550         wiphy->extended_capabilities_mask = extended_capabilities;
551         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
552 
553         if (ops->remain_on_channel)
554                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
555 
556         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
557                            NL80211_FEATURE_SAE |
558                            NL80211_FEATURE_HT_IBSS |
559                            NL80211_FEATURE_VIF_TXPOWER |
560                            NL80211_FEATURE_USERSPACE_MPM;
561 
562         if (!ops->hw_scan)
563                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
564                                    NL80211_FEATURE_AP_SCAN;
565 
566 
567         if (!ops->set_key)
568                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
569 
570         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
571 
572         local = wiphy_priv(wiphy);
573 
574         local->hw.wiphy = wiphy;
575 
576         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
577 
578         local->ops = ops;
579         local->use_chanctx = use_chanctx;
580 
581         /* set up some defaults */
582         local->hw.queues = 1;
583         local->hw.max_rates = 1;
584         local->hw.max_report_rates = 0;
585         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
586         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
587         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
588         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
589         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
590         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
591                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
592                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
593         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
594                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
595         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
596         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
597         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
598         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
599         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
600 
601         INIT_LIST_HEAD(&local->interfaces);
602 
603         __hw_addr_init(&local->mc_list);
604 
605         mutex_init(&local->iflist_mtx);
606         mutex_init(&local->mtx);
607 
608         mutex_init(&local->key_mtx);
609         spin_lock_init(&local->filter_lock);
610         spin_lock_init(&local->rx_path_lock);
611         spin_lock_init(&local->queue_stop_reason_lock);
612 
613         INIT_LIST_HEAD(&local->chanctx_list);
614         mutex_init(&local->chanctx_mtx);
615 
616         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
617 
618         INIT_WORK(&local->restart_work, ieee80211_restart_work);
619 
620         INIT_WORK(&local->radar_detected_work,
621                   ieee80211_dfs_radar_detected_work);
622 
623         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
624         local->smps_mode = IEEE80211_SMPS_OFF;
625 
626         INIT_WORK(&local->dynamic_ps_enable_work,
627                   ieee80211_dynamic_ps_enable_work);
628         INIT_WORK(&local->dynamic_ps_disable_work,
629                   ieee80211_dynamic_ps_disable_work);
630         setup_timer(&local->dynamic_ps_timer,
631                     ieee80211_dynamic_ps_timer, (unsigned long) local);
632 
633         INIT_WORK(&local->sched_scan_stopped_work,
634                   ieee80211_sched_scan_stopped_work);
635 
636         spin_lock_init(&local->ack_status_lock);
637         idr_init(&local->ack_status_frames);
638 
639         sta_info_init(local);
640 
641         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
642                 skb_queue_head_init(&local->pending[i]);
643                 atomic_set(&local->agg_queue_stop[i], 0);
644         }
645         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
646                      (unsigned long)local);
647 
648         tasklet_init(&local->tasklet,
649                      ieee80211_tasklet_handler,
650                      (unsigned long) local);
651 
652         skb_queue_head_init(&local->skb_queue);
653         skb_queue_head_init(&local->skb_queue_unreliable);
654 
655         ieee80211_led_names(local);
656 
657         ieee80211_roc_setup(local);
658 
659         return &local->hw;
660 }
661 EXPORT_SYMBOL(ieee80211_alloc_hw);
662 
663 int ieee80211_register_hw(struct ieee80211_hw *hw)
664 {
665         struct ieee80211_local *local = hw_to_local(hw);
666         int result, i;
667         enum ieee80211_band band;
668         int channels, max_bitrates;
669         bool supp_ht, supp_vht;
670         netdev_features_t feature_whitelist;
671         struct cfg80211_chan_def dflt_chandef = {};
672         static const u32 cipher_suites[] = {
673                 /* keep WEP first, it may be removed below */
674                 WLAN_CIPHER_SUITE_WEP40,
675                 WLAN_CIPHER_SUITE_WEP104,
676                 WLAN_CIPHER_SUITE_TKIP,
677                 WLAN_CIPHER_SUITE_CCMP,
678 
679                 /* keep last -- depends on hw flags! */
680                 WLAN_CIPHER_SUITE_AES_CMAC
681         };
682 
683         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
684             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
685              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
686                 return -EINVAL;
687 
688 #ifdef CONFIG_PM
689         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
690                 return -EINVAL;
691 #endif
692 
693         if (!local->use_chanctx) {
694                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
695                         const struct ieee80211_iface_combination *comb;
696 
697                         comb = &local->hw.wiphy->iface_combinations[i];
698 
699                         if (comb->num_different_channels > 1)
700                                 return -EINVAL;
701                 }
702         } else {
703                 /*
704                  * WDS is currently prohibited when channel contexts are used
705                  * because there's no clear definition of which channel WDS
706                  * type interfaces use
707                  */
708                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
709                         return -EINVAL;
710 
711                 /* DFS currently not supported with channel context drivers */
712                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
713                         const struct ieee80211_iface_combination *comb;
714 
715                         comb = &local->hw.wiphy->iface_combinations[i];
716 
717                         if (comb->radar_detect_widths)
718                                 return -EINVAL;
719                 }
720         }
721 
722         /* Only HW csum features are currently compatible with mac80211 */
723         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
724                             NETIF_F_HW_CSUM;
725         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
726                 return -EINVAL;
727 
728         if (hw->max_report_rates == 0)
729                 hw->max_report_rates = hw->max_rates;
730 
731         local->rx_chains = 1;
732 
733         /*
734          * generic code guarantees at least one band,
735          * set this very early because much code assumes
736          * that hw.conf.channel is assigned
737          */
738         channels = 0;
739         max_bitrates = 0;
740         supp_ht = false;
741         supp_vht = false;
742         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
743                 struct ieee80211_supported_band *sband;
744 
745                 sband = local->hw.wiphy->bands[band];
746                 if (!sband)
747                         continue;
748 
749                 if (!dflt_chandef.chan) {
750                         cfg80211_chandef_create(&dflt_chandef,
751                                                 &sband->channels[0],
752                                                 NL80211_CHAN_NO_HT);
753                         /* init channel we're on */
754                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
755                                 local->hw.conf.chandef = dflt_chandef;
756                                 local->_oper_chandef = dflt_chandef;
757                         }
758                         local->monitor_chandef = dflt_chandef;
759                 }
760 
761                 channels += sband->n_channels;
762 
763                 if (max_bitrates < sband->n_bitrates)
764                         max_bitrates = sband->n_bitrates;
765                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
766                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
767 
768                 if (sband->ht_cap.ht_supported)
769                         local->rx_chains =
770                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
771                                     local->rx_chains);
772 
773                 /* TODO: consider VHT for RX chains, hopefully it's the same */
774         }
775 
776         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
777                                       sizeof(void *) * channels, GFP_KERNEL);
778         if (!local->int_scan_req)
779                 return -ENOMEM;
780 
781         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
782                 if (!local->hw.wiphy->bands[band])
783                         continue;
784                 local->int_scan_req->rates[band] = (u32) -1;
785         }
786 
787         /* if low-level driver supports AP, we also support VLAN */
788         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
789                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
790                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
791         }
792 
793         /* mac80211 always supports monitor */
794         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
795         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
796 
797         /* mac80211 doesn't support more than one IBSS interface right now */
798         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
799                 const struct ieee80211_iface_combination *c;
800                 int j;
801 
802                 c = &hw->wiphy->iface_combinations[i];
803 
804                 for (j = 0; j < c->n_limits; j++)
805                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
806                             c->limits[j].max > 1)
807                                 return -EINVAL;
808         }
809 
810 #ifndef CONFIG_MAC80211_MESH
811         /* mesh depends on Kconfig, but drivers should set it if they want */
812         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
813 #endif
814 
815         /* if the underlying driver supports mesh, mac80211 will (at least)
816          * provide routing of mesh authentication frames to userspace */
817         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
818                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
819 
820         /* mac80211 supports control port protocol changing */
821         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
822 
823         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
824                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
825         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
826                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
827 
828         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
829              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
830              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
831 
832         /*
833          * Calculate scan IE length -- we need this to alloc
834          * memory and to subtract from the driver limit. It
835          * includes the DS Params, (extended) supported rates, and HT
836          * information -- SSID is the driver's responsibility.
837          */
838         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
839                 3 /* DS Params */;
840         if (supp_ht)
841                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
842 
843         if (supp_vht)
844                 local->scan_ies_len +=
845                         2 + sizeof(struct ieee80211_vht_cap);
846 
847         if (!local->ops->hw_scan) {
848                 /* For hw_scan, driver needs to set these up. */
849                 local->hw.wiphy->max_scan_ssids = 4;
850                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
851         }
852 
853         /*
854          * If the driver supports any scan IEs, then assume the
855          * limit includes the IEs mac80211 will add, otherwise
856          * leave it at zero and let the driver sort it out; we
857          * still pass our IEs to the driver but userspace will
858          * not be allowed to in that case.
859          */
860         if (local->hw.wiphy->max_scan_ie_len)
861                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
862 
863         /* Set up cipher suites unless driver already did */
864         if (!local->hw.wiphy->cipher_suites) {
865                 local->hw.wiphy->cipher_suites = cipher_suites;
866                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
867                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
868                         local->hw.wiphy->n_cipher_suites--;
869         }
870         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
871                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
872                         local->hw.wiphy->cipher_suites += 2;
873                         local->hw.wiphy->n_cipher_suites -= 2;
874                 } else {
875                         u32 *suites;
876                         int r, w = 0;
877 
878                         /* Filter out WEP */
879 
880                         suites = kmemdup(
881                                 local->hw.wiphy->cipher_suites,
882                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
883                                 GFP_KERNEL);
884                         if (!suites) {
885                                 result = -ENOMEM;
886                                 goto fail_wiphy_register;
887                         }
888                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
889                                 u32 suite = local->hw.wiphy->cipher_suites[r];
890                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
891                                     suite == WLAN_CIPHER_SUITE_WEP104)
892                                         continue;
893                                 suites[w++] = suite;
894                         }
895                         local->hw.wiphy->cipher_suites = suites;
896                         local->hw.wiphy->n_cipher_suites = w;
897                         local->wiphy_ciphers_allocated = true;
898                 }
899         }
900 
901         if (!local->ops->remain_on_channel)
902                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
903 
904         if (local->ops->sched_scan_start)
905                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
906 
907         /* mac80211 based drivers don't support internal TDLS setup */
908         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
909                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
910 
911         result = wiphy_register(local->hw.wiphy);
912         if (result < 0)
913                 goto fail_wiphy_register;
914 
915         /*
916          * We use the number of queues for feature tests (QoS, HT) internally
917          * so restrict them appropriately.
918          */
919         if (hw->queues > IEEE80211_MAX_QUEUES)
920                 hw->queues = IEEE80211_MAX_QUEUES;
921 
922         local->workqueue =
923                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
924         if (!local->workqueue) {
925                 result = -ENOMEM;
926                 goto fail_workqueue;
927         }
928 
929         /*
930          * The hardware needs headroom for sending the frame,
931          * and we need some headroom for passing the frame to monitor
932          * interfaces, but never both at the same time.
933          */
934         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
935                                    IEEE80211_TX_STATUS_HEADROOM);
936 
937         debugfs_hw_add(local);
938 
939         /*
940          * if the driver doesn't specify a max listen interval we
941          * use 5 which should be a safe default
942          */
943         if (local->hw.max_listen_interval == 0)
944                 local->hw.max_listen_interval = 5;
945 
946         local->hw.conf.listen_interval = local->hw.max_listen_interval;
947 
948         local->dynamic_ps_forced_timeout = -1;
949 
950         result = ieee80211_wep_init(local);
951         if (result < 0)
952                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
953                             result);
954 
955         ieee80211_led_init(local);
956 
957         rtnl_lock();
958 
959         result = ieee80211_init_rate_ctrl_alg(local,
960                                               hw->rate_control_algorithm);
961         if (result < 0) {
962                 wiphy_debug(local->hw.wiphy,
963                             "Failed to initialize rate control algorithm\n");
964                 goto fail_rate;
965         }
966 
967         /* add one default STA interface if supported */
968         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
969                 result = ieee80211_if_add(local, "wlan%d", NULL,
970                                           NL80211_IFTYPE_STATION, NULL);
971                 if (result)
972                         wiphy_warn(local->hw.wiphy,
973                                    "Failed to add default virtual iface\n");
974         }
975 
976         rtnl_unlock();
977 
978         local->network_latency_notifier.notifier_call =
979                 ieee80211_max_network_latency;
980         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
981                                      &local->network_latency_notifier);
982         if (result) {
983                 rtnl_lock();
984                 goto fail_pm_qos;
985         }
986 
987 #ifdef CONFIG_INET
988         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
989         result = register_inetaddr_notifier(&local->ifa_notifier);
990         if (result)
991                 goto fail_ifa;
992 #endif
993 
994 #if IS_ENABLED(CONFIG_IPV6)
995         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
996         result = register_inet6addr_notifier(&local->ifa6_notifier);
997         if (result)
998                 goto fail_ifa6;
999 #endif
1000 
1001         return 0;
1002 
1003 #if IS_ENABLED(CONFIG_IPV6)
1004  fail_ifa6:
1005 #ifdef CONFIG_INET
1006         unregister_inetaddr_notifier(&local->ifa_notifier);
1007 #endif
1008 #endif
1009 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1010  fail_ifa:
1011         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1012                                &local->network_latency_notifier);
1013         rtnl_lock();
1014 #endif
1015  fail_pm_qos:
1016         ieee80211_led_exit(local);
1017         ieee80211_remove_interfaces(local);
1018  fail_rate:
1019         rtnl_unlock();
1020         ieee80211_wep_free(local);
1021         sta_info_stop(local);
1022         destroy_workqueue(local->workqueue);
1023  fail_workqueue:
1024         wiphy_unregister(local->hw.wiphy);
1025  fail_wiphy_register:
1026         if (local->wiphy_ciphers_allocated)
1027                 kfree(local->hw.wiphy->cipher_suites);
1028         kfree(local->int_scan_req);
1029         return result;
1030 }
1031 EXPORT_SYMBOL(ieee80211_register_hw);
1032 
1033 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1034 {
1035         struct ieee80211_local *local = hw_to_local(hw);
1036 
1037         tasklet_kill(&local->tx_pending_tasklet);
1038         tasklet_kill(&local->tasklet);
1039 
1040         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1041                                &local->network_latency_notifier);
1042 #ifdef CONFIG_INET
1043         unregister_inetaddr_notifier(&local->ifa_notifier);
1044 #endif
1045 #if IS_ENABLED(CONFIG_IPV6)
1046         unregister_inet6addr_notifier(&local->ifa6_notifier);
1047 #endif
1048 
1049         rtnl_lock();
1050 
1051         /*
1052          * At this point, interface list manipulations are fine
1053          * because the driver cannot be handing us frames any
1054          * more and the tasklet is killed.
1055          */
1056         ieee80211_remove_interfaces(local);
1057 
1058         rtnl_unlock();
1059 
1060         cancel_work_sync(&local->restart_work);
1061         cancel_work_sync(&local->reconfig_filter);
1062 
1063         ieee80211_clear_tx_pending(local);
1064         rate_control_deinitialize(local);
1065 
1066         if (skb_queue_len(&local->skb_queue) ||
1067             skb_queue_len(&local->skb_queue_unreliable))
1068                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1069         skb_queue_purge(&local->skb_queue);
1070         skb_queue_purge(&local->skb_queue_unreliable);
1071 
1072         destroy_workqueue(local->workqueue);
1073         wiphy_unregister(local->hw.wiphy);
1074         sta_info_stop(local);
1075         ieee80211_wep_free(local);
1076         ieee80211_led_exit(local);
1077         kfree(local->int_scan_req);
1078 }
1079 EXPORT_SYMBOL(ieee80211_unregister_hw);
1080 
1081 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1082 {
1083         WARN_ONCE(1, "Have pending ack frames!\n");
1084         kfree_skb(p);
1085         return 0;
1086 }
1087 
1088 void ieee80211_free_hw(struct ieee80211_hw *hw)
1089 {
1090         struct ieee80211_local *local = hw_to_local(hw);
1091 
1092         mutex_destroy(&local->iflist_mtx);
1093         mutex_destroy(&local->mtx);
1094 
1095         if (local->wiphy_ciphers_allocated)
1096                 kfree(local->hw.wiphy->cipher_suites);
1097 
1098         idr_for_each(&local->ack_status_frames,
1099                      ieee80211_free_ack_frame, NULL);
1100         idr_destroy(&local->ack_status_frames);
1101 
1102         wiphy_free(local->hw.wiphy);
1103 }
1104 EXPORT_SYMBOL(ieee80211_free_hw);
1105 
1106 static int __init ieee80211_init(void)
1107 {
1108         struct sk_buff *skb;
1109         int ret;
1110 
1111         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1112         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1113                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1114 
1115         ret = rc80211_minstrel_init();
1116         if (ret)
1117                 return ret;
1118 
1119         ret = rc80211_minstrel_ht_init();
1120         if (ret)
1121                 goto err_minstrel;
1122 
1123         ret = rc80211_pid_init();
1124         if (ret)
1125                 goto err_pid;
1126 
1127         ret = ieee80211_iface_init();
1128         if (ret)
1129                 goto err_netdev;
1130 
1131         return 0;
1132  err_netdev:
1133         rc80211_pid_exit();
1134  err_pid:
1135         rc80211_minstrel_ht_exit();
1136  err_minstrel:
1137         rc80211_minstrel_exit();
1138 
1139         return ret;
1140 }
1141 
1142 static void __exit ieee80211_exit(void)
1143 {
1144         rc80211_pid_exit();
1145         rc80211_minstrel_ht_exit();
1146         rc80211_minstrel_exit();
1147 
1148         ieee80211s_stop();
1149 
1150         ieee80211_iface_exit();
1151 
1152         rcu_barrier();
1153 }
1154 
1155 
1156 subsys_initcall(ieee80211_init);
1157 module_exit(ieee80211_exit);
1158 
1159 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1160 MODULE_LICENSE("GPL");
1161 

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