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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 
 27 #include "ieee80211_i.h"
 28 #include "driver-ops.h"
 29 #include "rate.h"
 30 #include "mesh.h"
 31 #include "wep.h"
 32 #include "led.h"
 33 #include "cfg.h"
 34 #include "debugfs.h"
 35 
 36 static struct lock_class_key ieee80211_rx_skb_queue_class;
 37 
 38 void ieee80211_configure_filter(struct ieee80211_local *local)
 39 {
 40         u64 mc;
 41         unsigned int changed_flags;
 42         unsigned int new_flags = 0;
 43 
 44         if (atomic_read(&local->iff_promiscs))
 45                 new_flags |= FIF_PROMISC_IN_BSS;
 46 
 47         if (atomic_read(&local->iff_allmultis))
 48                 new_flags |= FIF_ALLMULTI;
 49 
 50         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 51             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
 52                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
 53 
 54         if (local->fif_probe_req || local->probe_req_reg)
 55                 new_flags |= FIF_PROBE_REQ;
 56 
 57         if (local->fif_fcsfail)
 58                 new_flags |= FIF_FCSFAIL;
 59 
 60         if (local->fif_plcpfail)
 61                 new_flags |= FIF_PLCPFAIL;
 62 
 63         if (local->fif_control)
 64                 new_flags |= FIF_CONTROL;
 65 
 66         if (local->fif_other_bss)
 67                 new_flags |= FIF_OTHER_BSS;
 68 
 69         if (local->fif_pspoll)
 70                 new_flags |= FIF_PSPOLL;
 71 
 72         spin_lock_bh(&local->filter_lock);
 73         changed_flags = local->filter_flags ^ new_flags;
 74 
 75         mc = drv_prepare_multicast(local, &local->mc_list);
 76         spin_unlock_bh(&local->filter_lock);
 77 
 78         /* be a bit nasty */
 79         new_flags |= (1<<31);
 80 
 81         drv_configure_filter(local, changed_flags, &new_flags, mc);
 82 
 83         WARN_ON(new_flags & (1<<31));
 84 
 85         local->filter_flags = new_flags & ~(1<<31);
 86 }
 87 
 88 static void ieee80211_reconfig_filter(struct work_struct *work)
 89 {
 90         struct ieee80211_local *local =
 91                 container_of(work, struct ieee80211_local, reconfig_filter);
 92 
 93         ieee80211_configure_filter(local);
 94 }
 95 
 96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 97 {
 98         struct ieee80211_channel *chan;
 99         int ret = 0;
100         int power;
101         enum nl80211_channel_type channel_type;
102         u32 offchannel_flag;
103 
104         might_sleep();
105 
106         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
107         if (local->scan_channel) {
108                 chan = local->scan_channel;
109                 /* If scanning on oper channel, use whatever channel-type
110                  * is currently in use.
111                  */
112                 if (chan == local->oper_channel)
113                         channel_type = local->_oper_channel_type;
114                 else
115                         channel_type = NL80211_CHAN_NO_HT;
116         } else if (local->tmp_channel) {
117                 chan = local->tmp_channel;
118                 channel_type = local->tmp_channel_type;
119         } else {
120                 chan = local->oper_channel;
121                 channel_type = local->_oper_channel_type;
122         }
123 
124         if (chan != local->oper_channel ||
125             channel_type != local->_oper_channel_type)
126                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
127         else
128                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
129 
130         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
131 
132         if (offchannel_flag || chan != local->hw.conf.channel ||
133             channel_type != local->hw.conf.channel_type) {
134                 local->hw.conf.channel = chan;
135                 local->hw.conf.channel_type = channel_type;
136                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
137         }
138 
139         if (!conf_is_ht(&local->hw.conf)) {
140                 /*
141                  * mac80211.h documents that this is only valid
142                  * when the channel is set to an HT type, and
143                  * that otherwise STATIC is used.
144                  */
145                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
146         } else if (local->hw.conf.smps_mode != local->smps_mode) {
147                 local->hw.conf.smps_mode = local->smps_mode;
148                 changed |= IEEE80211_CONF_CHANGE_SMPS;
149         }
150 
151         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
152             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
153             test_bit(SCAN_HW_SCANNING, &local->scanning) ||
154             !local->ap_power_level)
155                 power = chan->max_power;
156         else
157                 power = min(chan->max_power, local->ap_power_level);
158 
159         if (local->user_power_level >= 0)
160                 power = min(power, local->user_power_level);
161 
162         if (local->hw.conf.power_level != power) {
163                 changed |= IEEE80211_CONF_CHANGE_POWER;
164                 local->hw.conf.power_level = power;
165         }
166 
167         if (changed && local->open_count) {
168                 ret = drv_config(local, changed);
169                 /*
170                  * Goal:
171                  * HW reconfiguration should never fail, the driver has told
172                  * us what it can support so it should live up to that promise.
173                  *
174                  * Current status:
175                  * rfkill is not integrated with mac80211 and a
176                  * configuration command can thus fail if hardware rfkill
177                  * is enabled
178                  *
179                  * FIXME: integrate rfkill with mac80211 and then add this
180                  * WARN_ON() back
181                  *
182                  */
183                 /* WARN_ON(ret); */
184         }
185 
186         return ret;
187 }
188 
189 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
190                                       u32 changed)
191 {
192         struct ieee80211_local *local = sdata->local;
193         static const u8 zero[ETH_ALEN] = { 0 };
194 
195         if (!changed)
196                 return;
197 
198         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
199                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
200         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
201                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
202         else if (sdata->vif.type == NL80211_IFTYPE_AP)
203                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
204         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
205                 sdata->vif.bss_conf.bssid = NULL;
206         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
207                 sdata->vif.bss_conf.bssid = zero;
208         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
209                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
210                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
211                           "P2P Device BSS changed %#x", changed);
212         } else {
213                 WARN_ON(1);
214                 return;
215         }
216 
217         switch (sdata->vif.type) {
218         case NL80211_IFTYPE_AP:
219         case NL80211_IFTYPE_ADHOC:
220         case NL80211_IFTYPE_WDS:
221         case NL80211_IFTYPE_MESH_POINT:
222                 break;
223         default:
224                 /* do not warn to simplify caller in scan.c */
225                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
226                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
227                         return;
228                 break;
229         }
230 
231         if (changed & BSS_CHANGED_BEACON_ENABLED) {
232                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
233                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
234                         sdata->vif.bss_conf.enable_beacon = false;
235                 } else {
236                         /*
237                          * Beacon should be enabled, but AP mode must
238                          * check whether there is a beacon configured.
239                          */
240                         switch (sdata->vif.type) {
241                         case NL80211_IFTYPE_AP:
242                                 sdata->vif.bss_conf.enable_beacon =
243                                         !!sdata->u.ap.beacon;
244                                 break;
245                         case NL80211_IFTYPE_ADHOC:
246                                 sdata->vif.bss_conf.enable_beacon =
247                                         !!sdata->u.ibss.presp;
248                                 break;
249 #ifdef CONFIG_MAC80211_MESH
250                         case NL80211_IFTYPE_MESH_POINT:
251                                 sdata->vif.bss_conf.enable_beacon =
252                                         !!sdata->u.mesh.mesh_id_len;
253                                 break;
254 #endif
255                         default:
256                                 /* not reached */
257                                 WARN_ON(1);
258                                 break;
259                         }
260                 }
261         }
262 
263         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
264 }
265 
266 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
267 {
268         sdata->vif.bss_conf.use_cts_prot = false;
269         sdata->vif.bss_conf.use_short_preamble = false;
270         sdata->vif.bss_conf.use_short_slot = false;
271         return BSS_CHANGED_ERP_CTS_PROT |
272                BSS_CHANGED_ERP_PREAMBLE |
273                BSS_CHANGED_ERP_SLOT;
274 }
275 
276 static void ieee80211_tasklet_handler(unsigned long data)
277 {
278         struct ieee80211_local *local = (struct ieee80211_local *) data;
279         struct sta_info *sta, *tmp;
280         struct skb_eosp_msg_data *eosp_data;
281         struct sk_buff *skb;
282 
283         while ((skb = skb_dequeue(&local->skb_queue)) ||
284                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
285                 switch (skb->pkt_type) {
286                 case IEEE80211_RX_MSG:
287                         /* Clear skb->pkt_type in order to not confuse kernel
288                          * netstack. */
289                         skb->pkt_type = 0;
290                         ieee80211_rx(&local->hw, skb);
291                         break;
292                 case IEEE80211_TX_STATUS_MSG:
293                         skb->pkt_type = 0;
294                         ieee80211_tx_status(&local->hw, skb);
295                         break;
296                 case IEEE80211_EOSP_MSG:
297                         eosp_data = (void *)skb->cb;
298                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
299                                 /* skip wrong virtual interface */
300                                 if (memcmp(eosp_data->iface,
301                                            sta->sdata->vif.addr, ETH_ALEN))
302                                         continue;
303                                 clear_sta_flag(sta, WLAN_STA_SP);
304                                 break;
305                         }
306                         dev_kfree_skb(skb);
307                         break;
308                 default:
309                         WARN(1, "mac80211: Packet is of unknown type %d\n",
310                              skb->pkt_type);
311                         dev_kfree_skb(skb);
312                         break;
313                 }
314         }
315 }
316 
317 static void ieee80211_restart_work(struct work_struct *work)
318 {
319         struct ieee80211_local *local =
320                 container_of(work, struct ieee80211_local, restart_work);
321 
322         /* wait for scan work complete */
323         flush_workqueue(local->workqueue);
324 
325         mutex_lock(&local->mtx);
326         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
327              rcu_dereference_protected(local->sched_scan_sdata,
328                                        lockdep_is_held(&local->mtx)),
329                 "%s called with hardware scan in progress\n", __func__);
330         mutex_unlock(&local->mtx);
331 
332         rtnl_lock();
333         ieee80211_scan_cancel(local);
334         ieee80211_reconfig(local);
335         rtnl_unlock();
336 }
337 
338 void ieee80211_restart_hw(struct ieee80211_hw *hw)
339 {
340         struct ieee80211_local *local = hw_to_local(hw);
341 
342         trace_api_restart_hw(local);
343 
344         wiphy_info(hw->wiphy,
345                    "Hardware restart was requested\n");
346 
347         /* use this reason, ieee80211_reconfig will unblock it */
348         ieee80211_stop_queues_by_reason(hw,
349                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
350 
351         /*
352          * Stop all Rx during the reconfig. We don't want state changes
353          * or driver callbacks while this is in progress.
354          */
355         local->in_reconfig = true;
356         barrier();
357 
358         schedule_work(&local->restart_work);
359 }
360 EXPORT_SYMBOL(ieee80211_restart_hw);
361 
362 static void ieee80211_recalc_smps_work(struct work_struct *work)
363 {
364         struct ieee80211_local *local =
365                 container_of(work, struct ieee80211_local, recalc_smps);
366 
367         ieee80211_recalc_smps(local);
368 }
369 
370 #ifdef CONFIG_INET
371 static int ieee80211_ifa_changed(struct notifier_block *nb,
372                                  unsigned long data, void *arg)
373 {
374         struct in_ifaddr *ifa = arg;
375         struct ieee80211_local *local =
376                 container_of(nb, struct ieee80211_local,
377                              ifa_notifier);
378         struct net_device *ndev = ifa->ifa_dev->dev;
379         struct wireless_dev *wdev = ndev->ieee80211_ptr;
380         struct in_device *idev;
381         struct ieee80211_sub_if_data *sdata;
382         struct ieee80211_bss_conf *bss_conf;
383         struct ieee80211_if_managed *ifmgd;
384         int c = 0;
385 
386         /* Make sure it's our interface that got changed */
387         if (!wdev)
388                 return NOTIFY_DONE;
389 
390         if (wdev->wiphy != local->hw.wiphy)
391                 return NOTIFY_DONE;
392 
393         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
394         bss_conf = &sdata->vif.bss_conf;
395 
396         /* ARP filtering is only supported in managed mode */
397         if (sdata->vif.type != NL80211_IFTYPE_STATION)
398                 return NOTIFY_DONE;
399 
400         idev = __in_dev_get_rtnl(sdata->dev);
401         if (!idev)
402                 return NOTIFY_DONE;
403 
404         ifmgd = &sdata->u.mgd;
405         mutex_lock(&ifmgd->mtx);
406 
407         /* Copy the addresses to the bss_conf list */
408         ifa = idev->ifa_list;
409         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
410                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
411                 ifa = ifa->ifa_next;
412                 c++;
413         }
414 
415         /* If not all addresses fit the list, disable filtering */
416         if (ifa) {
417                 sdata->arp_filter_state = false;
418                 c = 0;
419         } else {
420                 sdata->arp_filter_state = true;
421         }
422         bss_conf->arp_addr_cnt = c;
423 
424         /* Configure driver only if associated (which also implies it is up) */
425         if (ifmgd->associated) {
426                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
427                 ieee80211_bss_info_change_notify(sdata,
428                                                  BSS_CHANGED_ARP_FILTER);
429         }
430 
431         mutex_unlock(&ifmgd->mtx);
432 
433         return NOTIFY_DONE;
434 }
435 #endif
436 
437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
438 {
439         struct ieee80211_local *local =
440                 container_of(napi, struct ieee80211_local, napi);
441 
442         return local->ops->napi_poll(&local->hw, budget);
443 }
444 
445 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
446 {
447         struct ieee80211_local *local = hw_to_local(hw);
448 
449         napi_schedule(&local->napi);
450 }
451 EXPORT_SYMBOL(ieee80211_napi_schedule);
452 
453 void ieee80211_napi_complete(struct ieee80211_hw *hw)
454 {
455         struct ieee80211_local *local = hw_to_local(hw);
456 
457         napi_complete(&local->napi);
458 }
459 EXPORT_SYMBOL(ieee80211_napi_complete);
460 
461 /* There isn't a lot of sense in it, but you can transmit anything you like */
462 static const struct ieee80211_txrx_stypes
463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
464         [NL80211_IFTYPE_ADHOC] = {
465                 .tx = 0xffff,
466                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
467                         BIT(IEEE80211_STYPE_AUTH >> 4) |
468                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
469         },
470         [NL80211_IFTYPE_STATION] = {
471                 .tx = 0xffff,
472                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
474         },
475         [NL80211_IFTYPE_AP] = {
476                 .tx = 0xffff,
477                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
478                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
479                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
480                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
481                         BIT(IEEE80211_STYPE_AUTH >> 4) |
482                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
483                         BIT(IEEE80211_STYPE_ACTION >> 4),
484         },
485         [NL80211_IFTYPE_AP_VLAN] = {
486                 /* copy AP */
487                 .tx = 0xffff,
488                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
489                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
491                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
492                         BIT(IEEE80211_STYPE_AUTH >> 4) |
493                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
494                         BIT(IEEE80211_STYPE_ACTION >> 4),
495         },
496         [NL80211_IFTYPE_P2P_CLIENT] = {
497                 .tx = 0xffff,
498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
499                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
500         },
501         [NL80211_IFTYPE_P2P_GO] = {
502                 .tx = 0xffff,
503                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
504                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
505                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
506                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
507                         BIT(IEEE80211_STYPE_AUTH >> 4) |
508                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
509                         BIT(IEEE80211_STYPE_ACTION >> 4),
510         },
511         [NL80211_IFTYPE_MESH_POINT] = {
512                 .tx = 0xffff,
513                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
514                         BIT(IEEE80211_STYPE_AUTH >> 4) |
515                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
516         },
517         [NL80211_IFTYPE_P2P_DEVICE] = {
518                 .tx = 0xffff,
519                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
520                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
521         },
522 };
523 
524 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
525         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
526                              IEEE80211_HT_AMPDU_PARM_DENSITY,
527 
528         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
529                                 IEEE80211_HT_CAP_MAX_AMSDU |
530                                 IEEE80211_HT_CAP_SGI_40),
531         .mcs = {
532                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
533                              0xff, 0xff, 0xff, 0xff, 0xff, },
534         },
535 };
536 
537 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
538                                         const struct ieee80211_ops *ops)
539 {
540         struct ieee80211_local *local;
541         int priv_size, i;
542         struct wiphy *wiphy;
543 
544         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
545                     !ops->add_interface || !ops->remove_interface ||
546                     !ops->configure_filter))
547                 return NULL;
548 
549         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
550                 return NULL;
551 
552         /* Ensure 32-byte alignment of our private data and hw private data.
553          * We use the wiphy priv data for both our ieee80211_local and for
554          * the driver's private data
555          *
556          * In memory it'll be like this:
557          *
558          * +-------------------------+
559          * | struct wiphy           |
560          * +-------------------------+
561          * | struct ieee80211_local  |
562          * +-------------------------+
563          * | driver's private data   |
564          * +-------------------------+
565          *
566          */
567         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
568 
569         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
570 
571         if (!wiphy)
572                 return NULL;
573 
574         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
575 
576         wiphy->privid = mac80211_wiphy_privid;
577 
578         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
579                         WIPHY_FLAG_4ADDR_AP |
580                         WIPHY_FLAG_4ADDR_STATION |
581                         WIPHY_FLAG_REPORTS_OBSS |
582                         WIPHY_FLAG_OFFCHAN_TX;
583 
584         if (ops->remain_on_channel)
585                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
586 
587         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
588                           NL80211_FEATURE_HT_IBSS;
589 
590         if (!ops->set_key)
591                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
592 
593         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
594 
595         local = wiphy_priv(wiphy);
596 
597         local->hw.wiphy = wiphy;
598 
599         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
600 
601         local->ops = ops;
602 
603         /* set up some defaults */
604         local->hw.queues = 1;
605         local->hw.max_rates = 1;
606         local->hw.max_report_rates = 0;
607         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
608         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
609         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
610         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
611         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
612         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
613                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
614                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
615         local->user_power_level = -1;
616         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
617 
618         INIT_LIST_HEAD(&local->interfaces);
619 
620         __hw_addr_init(&local->mc_list);
621 
622         mutex_init(&local->iflist_mtx);
623         mutex_init(&local->mtx);
624 
625         mutex_init(&local->key_mtx);
626         spin_lock_init(&local->filter_lock);
627         spin_lock_init(&local->queue_stop_reason_lock);
628 
629         /*
630          * The rx_skb_queue is only accessed from tasklets,
631          * but other SKB queues are used from within IRQ
632          * context. Therefore, this one needs a different
633          * locking class so our direct, non-irq-safe use of
634          * the queue's lock doesn't throw lockdep warnings.
635          */
636         skb_queue_head_init_class(&local->rx_skb_queue,
637                                   &ieee80211_rx_skb_queue_class);
638 
639         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
640 
641         INIT_WORK(&local->restart_work, ieee80211_restart_work);
642 
643         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
644         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
645         local->smps_mode = IEEE80211_SMPS_OFF;
646 
647         INIT_WORK(&local->dynamic_ps_enable_work,
648                   ieee80211_dynamic_ps_enable_work);
649         INIT_WORK(&local->dynamic_ps_disable_work,
650                   ieee80211_dynamic_ps_disable_work);
651         setup_timer(&local->dynamic_ps_timer,
652                     ieee80211_dynamic_ps_timer, (unsigned long) local);
653 
654         INIT_WORK(&local->sched_scan_stopped_work,
655                   ieee80211_sched_scan_stopped_work);
656 
657         spin_lock_init(&local->ack_status_lock);
658         idr_init(&local->ack_status_frames);
659         /* preallocate at least one entry */
660         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
661 
662         sta_info_init(local);
663 
664         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
665                 skb_queue_head_init(&local->pending[i]);
666                 atomic_set(&local->agg_queue_stop[i], 0);
667         }
668         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
669                      (unsigned long)local);
670 
671         tasklet_init(&local->tasklet,
672                      ieee80211_tasklet_handler,
673                      (unsigned long) local);
674 
675         skb_queue_head_init(&local->skb_queue);
676         skb_queue_head_init(&local->skb_queue_unreliable);
677 
678         /* init dummy netdev for use w/ NAPI */
679         init_dummy_netdev(&local->napi_dev);
680 
681         ieee80211_led_names(local);
682 
683         ieee80211_roc_setup(local);
684 
685         return &local->hw;
686 }
687 EXPORT_SYMBOL(ieee80211_alloc_hw);
688 
689 int ieee80211_register_hw(struct ieee80211_hw *hw)
690 {
691         struct ieee80211_local *local = hw_to_local(hw);
692         int result, i;
693         enum ieee80211_band band;
694         int channels, max_bitrates;
695         bool supp_ht, supp_vht;
696         netdev_features_t feature_whitelist;
697         static const u32 cipher_suites[] = {
698                 /* keep WEP first, it may be removed below */
699                 WLAN_CIPHER_SUITE_WEP40,
700                 WLAN_CIPHER_SUITE_WEP104,
701                 WLAN_CIPHER_SUITE_TKIP,
702                 WLAN_CIPHER_SUITE_CCMP,
703 
704                 /* keep last -- depends on hw flags! */
705                 WLAN_CIPHER_SUITE_AES_CMAC
706         };
707 
708         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
709             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
710              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
711                 return -EINVAL;
712 
713 #ifdef CONFIG_PM
714         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
715             (!local->ops->suspend || !local->ops->resume))
716                 return -EINVAL;
717 #endif
718 
719         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
720                 return -EINVAL;
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         /*
732          * generic code guarantees at least one band,
733          * set this very early because much code assumes
734          * that hw.conf.channel is assigned
735          */
736         channels = 0;
737         max_bitrates = 0;
738         supp_ht = false;
739         supp_vht = false;
740         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
741                 struct ieee80211_supported_band *sband;
742 
743                 sband = local->hw.wiphy->bands[band];
744                 if (!sband)
745                         continue;
746                 if (!local->oper_channel) {
747                         /* init channel we're on */
748                         local->hw.conf.channel =
749                         local->oper_channel = &sband->channels[0];
750                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
751                 }
752                 channels += sband->n_channels;
753 
754                 if (max_bitrates < sband->n_bitrates)
755                         max_bitrates = sband->n_bitrates;
756                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
757                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
758         }
759 
760         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
761                                       sizeof(void *) * channels, GFP_KERNEL);
762         if (!local->int_scan_req)
763                 return -ENOMEM;
764 
765         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
766                 if (!local->hw.wiphy->bands[band])
767                         continue;
768                 local->int_scan_req->rates[band] = (u32) -1;
769         }
770 
771         /* if low-level driver supports AP, we also support VLAN */
772         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
773                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
774                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
775         }
776 
777         /* mac80211 always supports monitor */
778         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
779         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
780 
781         /*
782          * mac80211 doesn't support more than 1 channel, and also not more
783          * than one IBSS interface
784          */
785         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
786                 const struct ieee80211_iface_combination *c;
787                 int j;
788 
789                 c = &hw->wiphy->iface_combinations[i];
790 
791                 if (c->num_different_channels > 1)
792                         return -EINVAL;
793 
794                 for (j = 0; j < c->n_limits; j++)
795                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
796                             c->limits[j].max > 1)
797                                 return -EINVAL;
798         }
799 
800 #ifndef CONFIG_MAC80211_MESH
801         /* mesh depends on Kconfig, but drivers should set it if they want */
802         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
803 #endif
804 
805         /* if the underlying driver supports mesh, mac80211 will (at least)
806          * provide routing of mesh authentication frames to userspace */
807         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
808                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
809 
810         /* mac80211 supports control port protocol changing */
811         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
812 
813         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
814                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
815         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
816                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
817 
818         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
819              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
820              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
821 
822         /*
823          * Calculate scan IE length -- we need this to alloc
824          * memory and to subtract from the driver limit. It
825          * includes the DS Params, (extended) supported rates, and HT
826          * information -- SSID is the driver's responsibility.
827          */
828         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
829                 3 /* DS Params */;
830         if (supp_ht)
831                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
832 
833         if (supp_vht)
834                 local->scan_ies_len +=
835                         2 + sizeof(struct ieee80211_vht_capabilities);
836 
837         if (!local->ops->hw_scan) {
838                 /* For hw_scan, driver needs to set these up. */
839                 local->hw.wiphy->max_scan_ssids = 4;
840                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
841         }
842 
843         /*
844          * If the driver supports any scan IEs, then assume the
845          * limit includes the IEs mac80211 will add, otherwise
846          * leave it at zero and let the driver sort it out; we
847          * still pass our IEs to the driver but userspace will
848          * not be allowed to in that case.
849          */
850         if (local->hw.wiphy->max_scan_ie_len)
851                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
852 
853         /* Set up cipher suites unless driver already did */
854         if (!local->hw.wiphy->cipher_suites) {
855                 local->hw.wiphy->cipher_suites = cipher_suites;
856                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
857                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
858                         local->hw.wiphy->n_cipher_suites--;
859         }
860         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
861                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
862                         local->hw.wiphy->cipher_suites += 2;
863                         local->hw.wiphy->n_cipher_suites -= 2;
864                 } else {
865                         u32 *suites;
866                         int r, w = 0;
867 
868                         /* Filter out WEP */
869 
870                         suites = kmemdup(
871                                 local->hw.wiphy->cipher_suites,
872                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
873                                 GFP_KERNEL);
874                         if (!suites) {
875                                 result = -ENOMEM;
876                                 goto fail_wiphy_register;
877                         }
878                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
879                                 u32 suite = local->hw.wiphy->cipher_suites[r];
880                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
881                                     suite == WLAN_CIPHER_SUITE_WEP104)
882                                         continue;
883                                 suites[w++] = suite;
884                         }
885                         local->hw.wiphy->cipher_suites = suites;
886                         local->hw.wiphy->n_cipher_suites = w;
887                         local->wiphy_ciphers_allocated = true;
888                 }
889         }
890 
891         if (!local->ops->remain_on_channel)
892                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
893 
894         if (local->ops->sched_scan_start)
895                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
896 
897         /* mac80211 based drivers don't support internal TDLS setup */
898         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
899                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
900 
901         result = wiphy_register(local->hw.wiphy);
902         if (result < 0)
903                 goto fail_wiphy_register;
904 
905         /*
906          * We use the number of queues for feature tests (QoS, HT) internally
907          * so restrict them appropriately.
908          */
909         if (hw->queues > IEEE80211_MAX_QUEUES)
910                 hw->queues = IEEE80211_MAX_QUEUES;
911 
912         local->workqueue =
913                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
914         if (!local->workqueue) {
915                 result = -ENOMEM;
916                 goto fail_workqueue;
917         }
918 
919         /*
920          * The hardware needs headroom for sending the frame,
921          * and we need some headroom for passing the frame to monitor
922          * interfaces, but never both at the same time.
923          */
924         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
925                                    IEEE80211_TX_STATUS_HEADROOM);
926 
927         debugfs_hw_add(local);
928 
929         /*
930          * if the driver doesn't specify a max listen interval we
931          * use 5 which should be a safe default
932          */
933         if (local->hw.max_listen_interval == 0)
934                 local->hw.max_listen_interval = 5;
935 
936         local->hw.conf.listen_interval = local->hw.max_listen_interval;
937 
938         local->dynamic_ps_forced_timeout = -1;
939 
940         result = ieee80211_wep_init(local);
941         if (result < 0)
942                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
943                             result);
944 
945         ieee80211_led_init(local);
946 
947         rtnl_lock();
948 
949         result = ieee80211_init_rate_ctrl_alg(local,
950                                               hw->rate_control_algorithm);
951         if (result < 0) {
952                 wiphy_debug(local->hw.wiphy,
953                             "Failed to initialize rate control algorithm\n");
954                 goto fail_rate;
955         }
956 
957         /* add one default STA interface if supported */
958         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
959                 result = ieee80211_if_add(local, "wlan%d", NULL,
960                                           NL80211_IFTYPE_STATION, NULL);
961                 if (result)
962                         wiphy_warn(local->hw.wiphy,
963                                    "Failed to add default virtual iface\n");
964         }
965 
966         rtnl_unlock();
967 
968         local->network_latency_notifier.notifier_call =
969                 ieee80211_max_network_latency;
970         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
971                                      &local->network_latency_notifier);
972         if (result) {
973                 rtnl_lock();
974                 goto fail_pm_qos;
975         }
976 
977 #ifdef CONFIG_INET
978         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
979         result = register_inetaddr_notifier(&local->ifa_notifier);
980         if (result)
981                 goto fail_ifa;
982 #endif
983 
984         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
985                         local->hw.napi_weight);
986 
987         return 0;
988 
989 #ifdef CONFIG_INET
990  fail_ifa:
991         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
992                                &local->network_latency_notifier);
993         rtnl_lock();
994 #endif
995  fail_pm_qos:
996         ieee80211_led_exit(local);
997         ieee80211_remove_interfaces(local);
998  fail_rate:
999         rtnl_unlock();
1000         ieee80211_wep_free(local);
1001         sta_info_stop(local);
1002         destroy_workqueue(local->workqueue);
1003  fail_workqueue:
1004         wiphy_unregister(local->hw.wiphy);
1005  fail_wiphy_register:
1006         if (local->wiphy_ciphers_allocated)
1007                 kfree(local->hw.wiphy->cipher_suites);
1008         kfree(local->int_scan_req);
1009         return result;
1010 }
1011 EXPORT_SYMBOL(ieee80211_register_hw);
1012 
1013 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1014 {
1015         struct ieee80211_local *local = hw_to_local(hw);
1016 
1017         tasklet_kill(&local->tx_pending_tasklet);
1018         tasklet_kill(&local->tasklet);
1019 
1020         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1021                                &local->network_latency_notifier);
1022 #ifdef CONFIG_INET
1023         unregister_inetaddr_notifier(&local->ifa_notifier);
1024 #endif
1025 
1026         rtnl_lock();
1027 
1028         /*
1029          * At this point, interface list manipulations are fine
1030          * because the driver cannot be handing us frames any
1031          * more and the tasklet is killed.
1032          */
1033         ieee80211_remove_interfaces(local);
1034 
1035         rtnl_unlock();
1036 
1037         cancel_work_sync(&local->restart_work);
1038         cancel_work_sync(&local->reconfig_filter);
1039 
1040         ieee80211_clear_tx_pending(local);
1041         rate_control_deinitialize(local);
1042 
1043         if (skb_queue_len(&local->skb_queue) ||
1044             skb_queue_len(&local->skb_queue_unreliable))
1045                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1046         skb_queue_purge(&local->skb_queue);
1047         skb_queue_purge(&local->skb_queue_unreliable);
1048         skb_queue_purge(&local->rx_skb_queue);
1049 
1050         destroy_workqueue(local->workqueue);
1051         wiphy_unregister(local->hw.wiphy);
1052         sta_info_stop(local);
1053         ieee80211_wep_free(local);
1054         ieee80211_led_exit(local);
1055         kfree(local->int_scan_req);
1056 }
1057 EXPORT_SYMBOL(ieee80211_unregister_hw);
1058 
1059 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1060 {
1061         WARN_ONCE(1, "Have pending ack frames!\n");
1062         kfree_skb(p);
1063         return 0;
1064 }
1065 
1066 void ieee80211_free_hw(struct ieee80211_hw *hw)
1067 {
1068         struct ieee80211_local *local = hw_to_local(hw);
1069 
1070         mutex_destroy(&local->iflist_mtx);
1071         mutex_destroy(&local->mtx);
1072 
1073         if (local->wiphy_ciphers_allocated)
1074                 kfree(local->hw.wiphy->cipher_suites);
1075 
1076         idr_for_each(&local->ack_status_frames,
1077                      ieee80211_free_ack_frame, NULL);
1078         idr_destroy(&local->ack_status_frames);
1079 
1080         wiphy_free(local->hw.wiphy);
1081 }
1082 EXPORT_SYMBOL(ieee80211_free_hw);
1083 
1084 static int __init ieee80211_init(void)
1085 {
1086         struct sk_buff *skb;
1087         int ret;
1088 
1089         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1090         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1091                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1092 
1093         ret = rc80211_minstrel_init();
1094         if (ret)
1095                 return ret;
1096 
1097         ret = rc80211_minstrel_ht_init();
1098         if (ret)
1099                 goto err_minstrel;
1100 
1101         ret = rc80211_pid_init();
1102         if (ret)
1103                 goto err_pid;
1104 
1105         ret = ieee80211_iface_init();
1106         if (ret)
1107                 goto err_netdev;
1108 
1109         return 0;
1110  err_netdev:
1111         rc80211_pid_exit();
1112  err_pid:
1113         rc80211_minstrel_ht_exit();
1114  err_minstrel:
1115         rc80211_minstrel_exit();
1116 
1117         return ret;
1118 }
1119 
1120 static void __exit ieee80211_exit(void)
1121 {
1122         rc80211_pid_exit();
1123         rc80211_minstrel_ht_exit();
1124         rc80211_minstrel_exit();
1125 
1126         if (mesh_allocated)
1127                 ieee80211s_stop();
1128 
1129         ieee80211_iface_exit();
1130 
1131         rcu_barrier();
1132 }
1133 
1134 
1135 subsys_initcall(ieee80211_init);
1136 module_exit(ieee80211_exit);
1137 
1138 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1139 MODULE_LICENSE("GPL");
1140 

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