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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_params.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 || 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 /*
 96  * Returns true if we are logically configured to be on
 97  * the operating channel AND the hardware-conf is currently
 98  * configured on the operating channel.  Compares channel-type
 99  * as well.
100  */
101 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
102 {
103         struct ieee80211_channel *chan, *scan_chan;
104         enum nl80211_channel_type channel_type;
105 
106         /* This logic needs to match logic in ieee80211_hw_config */
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 = scan_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                 return false;
127 
128         /* Check current hardware-config against oper_channel. */
129         if ((local->oper_channel != local->hw.conf.channel) ||
130             (local->_oper_channel_type != local->hw.conf.channel_type))
131                 return false;
132 
133         return true;
134 }
135 
136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137 {
138         struct ieee80211_channel *chan, *scan_chan;
139         int ret = 0;
140         int power;
141         enum nl80211_channel_type channel_type;
142         u32 offchannel_flag;
143 
144         might_sleep();
145 
146         scan_chan = local->scan_channel;
147 
148         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
149          * may need to change as well.
150          */
151         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
152         if (scan_chan) {
153                 chan = scan_chan;
154                 /* If scanning on oper channel, use whatever channel-type
155                  * is currently in use.
156                  */
157                 if (chan == local->oper_channel)
158                         channel_type = local->_oper_channel_type;
159                 else
160                         channel_type = NL80211_CHAN_NO_HT;
161         } else if (local->tmp_channel) {
162                 chan = scan_chan = local->tmp_channel;
163                 channel_type = local->tmp_channel_type;
164         } else {
165                 chan = local->oper_channel;
166                 channel_type = local->_oper_channel_type;
167         }
168 
169         if (chan != local->oper_channel ||
170             channel_type != local->_oper_channel_type)
171                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
172         else
173                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
174 
175         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
176 
177         if (offchannel_flag || chan != local->hw.conf.channel ||
178             channel_type != local->hw.conf.channel_type) {
179                 local->hw.conf.channel = chan;
180                 local->hw.conf.channel_type = channel_type;
181                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
182         }
183 
184         if (!conf_is_ht(&local->hw.conf)) {
185                 /*
186                  * mac80211.h documents that this is only valid
187                  * when the channel is set to an HT type, and
188                  * that otherwise STATIC is used.
189                  */
190                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
191         } else if (local->hw.conf.smps_mode != local->smps_mode) {
192                 local->hw.conf.smps_mode = local->smps_mode;
193                 changed |= IEEE80211_CONF_CHANGE_SMPS;
194         }
195 
196         if ((local->scanning & SCAN_SW_SCANNING) ||
197             (local->scanning & SCAN_HW_SCANNING))
198                 power = chan->max_power;
199         else
200                 power = local->power_constr_level ?
201                         (chan->max_power - local->power_constr_level) :
202                         chan->max_power;
203 
204         if (local->user_power_level >= 0)
205                 power = min(power, local->user_power_level);
206 
207         if (local->hw.conf.power_level != power) {
208                 changed |= IEEE80211_CONF_CHANGE_POWER;
209                 local->hw.conf.power_level = power;
210         }
211 
212         if (changed && local->open_count) {
213                 ret = drv_config(local, changed);
214                 /*
215                  * Goal:
216                  * HW reconfiguration should never fail, the driver has told
217                  * us what it can support so it should live up to that promise.
218                  *
219                  * Current status:
220                  * rfkill is not integrated with mac80211 and a
221                  * configuration command can thus fail if hardware rfkill
222                  * is enabled
223                  *
224                  * FIXME: integrate rfkill with mac80211 and then add this
225                  * WARN_ON() back
226                  *
227                  */
228                 /* WARN_ON(ret); */
229         }
230 
231         return ret;
232 }
233 
234 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
235                                       u32 changed)
236 {
237         struct ieee80211_local *local = sdata->local;
238         static const u8 zero[ETH_ALEN] = { 0 };
239 
240         if (!changed)
241                 return;
242 
243         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
244                 /*
245                  * While not associated, claim a BSSID of all-zeroes
246                  * so that drivers don't do any weird things with the
247                  * BSSID at that time.
248                  */
249                 if (sdata->vif.bss_conf.assoc)
250                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
251                 else
252                         sdata->vif.bss_conf.bssid = zero;
253         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
254                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
255         else if (sdata->vif.type == NL80211_IFTYPE_AP)
256                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
257         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
258                 sdata->vif.bss_conf.bssid = NULL;
259         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
260                 sdata->vif.bss_conf.bssid = zero;
261         } else {
262                 WARN_ON(1);
263                 return;
264         }
265 
266         switch (sdata->vif.type) {
267         case NL80211_IFTYPE_AP:
268         case NL80211_IFTYPE_ADHOC:
269         case NL80211_IFTYPE_WDS:
270         case NL80211_IFTYPE_MESH_POINT:
271                 break;
272         default:
273                 /* do not warn to simplify caller in scan.c */
274                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
275                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
276                         return;
277                 break;
278         }
279 
280         if (changed & BSS_CHANGED_BEACON_ENABLED) {
281                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
282                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
283                         sdata->vif.bss_conf.enable_beacon = false;
284                 } else {
285                         /*
286                          * Beacon should be enabled, but AP mode must
287                          * check whether there is a beacon configured.
288                          */
289                         switch (sdata->vif.type) {
290                         case NL80211_IFTYPE_AP:
291                                 sdata->vif.bss_conf.enable_beacon =
292                                         !!sdata->u.ap.beacon;
293                                 break;
294                         case NL80211_IFTYPE_ADHOC:
295                                 sdata->vif.bss_conf.enable_beacon =
296                                         !!sdata->u.ibss.presp;
297                                 break;
298 #ifdef CONFIG_MAC80211_MESH
299                         case NL80211_IFTYPE_MESH_POINT:
300                                 sdata->vif.bss_conf.enable_beacon =
301                                         !!sdata->u.mesh.mesh_id_len;
302                                 break;
303 #endif
304                         default:
305                                 /* not reached */
306                                 WARN_ON(1);
307                                 break;
308                         }
309                 }
310         }
311 
312         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
313 }
314 
315 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
316 {
317         sdata->vif.bss_conf.use_cts_prot = false;
318         sdata->vif.bss_conf.use_short_preamble = false;
319         sdata->vif.bss_conf.use_short_slot = false;
320         return BSS_CHANGED_ERP_CTS_PROT |
321                BSS_CHANGED_ERP_PREAMBLE |
322                BSS_CHANGED_ERP_SLOT;
323 }
324 
325 static void ieee80211_tasklet_handler(unsigned long data)
326 {
327         struct ieee80211_local *local = (struct ieee80211_local *) data;
328         struct sk_buff *skb;
329 
330         while ((skb = skb_dequeue(&local->skb_queue)) ||
331                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332                 switch (skb->pkt_type) {
333                 case IEEE80211_RX_MSG:
334                         /* Clear skb->pkt_type in order to not confuse kernel
335                          * netstack. */
336                         skb->pkt_type = 0;
337                         ieee80211_rx(local_to_hw(local), skb);
338                         break;
339                 case IEEE80211_TX_STATUS_MSG:
340                         skb->pkt_type = 0;
341                         ieee80211_tx_status(local_to_hw(local), skb);
342                         break;
343                 default:
344                         WARN(1, "mac80211: Packet is of unknown type %d\n",
345                              skb->pkt_type);
346                         dev_kfree_skb(skb);
347                         break;
348                 }
349         }
350 }
351 
352 static void ieee80211_restart_work(struct work_struct *work)
353 {
354         struct ieee80211_local *local =
355                 container_of(work, struct ieee80211_local, restart_work);
356 
357         /* wait for scan work complete */
358         flush_workqueue(local->workqueue);
359 
360         mutex_lock(&local->mtx);
361         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
362              local->sched_scanning,
363                 "%s called with hardware scan in progress\n", __func__);
364         mutex_unlock(&local->mtx);
365 
366         rtnl_lock();
367         ieee80211_scan_cancel(local);
368         ieee80211_reconfig(local);
369         rtnl_unlock();
370 }
371 
372 void ieee80211_restart_hw(struct ieee80211_hw *hw)
373 {
374         struct ieee80211_local *local = hw_to_local(hw);
375 
376         trace_api_restart_hw(local);
377 
378         wiphy_info(hw->wiphy,
379                    "Hardware restart was requested\n");
380 
381         /* use this reason, ieee80211_reconfig will unblock it */
382         ieee80211_stop_queues_by_reason(hw,
383                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
384 
385         schedule_work(&local->restart_work);
386 }
387 EXPORT_SYMBOL(ieee80211_restart_hw);
388 
389 static void ieee80211_recalc_smps_work(struct work_struct *work)
390 {
391         struct ieee80211_local *local =
392                 container_of(work, struct ieee80211_local, recalc_smps);
393 
394         mutex_lock(&local->iflist_mtx);
395         ieee80211_recalc_smps(local);
396         mutex_unlock(&local->iflist_mtx);
397 }
398 
399 #ifdef CONFIG_INET
400 static int ieee80211_ifa_changed(struct notifier_block *nb,
401                                  unsigned long data, void *arg)
402 {
403         struct in_ifaddr *ifa = arg;
404         struct ieee80211_local *local =
405                 container_of(nb, struct ieee80211_local,
406                              ifa_notifier);
407         struct net_device *ndev = ifa->ifa_dev->dev;
408         struct wireless_dev *wdev = ndev->ieee80211_ptr;
409         struct in_device *idev;
410         struct ieee80211_sub_if_data *sdata;
411         struct ieee80211_bss_conf *bss_conf;
412         struct ieee80211_if_managed *ifmgd;
413         int c = 0;
414 
415         /* Make sure it's our interface that got changed */
416         if (!wdev)
417                 return NOTIFY_DONE;
418 
419         if (wdev->wiphy != local->hw.wiphy)
420                 return NOTIFY_DONE;
421 
422         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
423         bss_conf = &sdata->vif.bss_conf;
424 
425         if (!ieee80211_sdata_running(sdata))
426                 return NOTIFY_DONE;
427 
428         /* ARP filtering is only supported in managed mode */
429         if (sdata->vif.type != NL80211_IFTYPE_STATION)
430                 return NOTIFY_DONE;
431 
432         idev = __in_dev_get_rtnl(sdata->dev);
433         if (!idev)
434                 return NOTIFY_DONE;
435 
436         ifmgd = &sdata->u.mgd;
437         mutex_lock(&ifmgd->mtx);
438 
439         /* Copy the addresses to the bss_conf list */
440         ifa = idev->ifa_list;
441         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
442                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
443                 ifa = ifa->ifa_next;
444                 c++;
445         }
446 
447         /* If not all addresses fit the list, disable filtering */
448         if (ifa) {
449                 sdata->arp_filter_state = false;
450                 c = 0;
451         } else {
452                 sdata->arp_filter_state = true;
453         }
454         bss_conf->arp_addr_cnt = c;
455 
456         /* Configure driver only if associated */
457         if (ifmgd->associated) {
458                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
459                 ieee80211_bss_info_change_notify(sdata,
460                                                  BSS_CHANGED_ARP_FILTER);
461         }
462 
463         mutex_unlock(&ifmgd->mtx);
464 
465         return NOTIFY_DONE;
466 }
467 #endif
468 
469 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
470 {
471         struct ieee80211_local *local =
472                 container_of(napi, struct ieee80211_local, napi);
473 
474         return local->ops->napi_poll(&local->hw, budget);
475 }
476 
477 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
478 {
479         struct ieee80211_local *local = hw_to_local(hw);
480 
481         napi_schedule(&local->napi);
482 }
483 EXPORT_SYMBOL(ieee80211_napi_schedule);
484 
485 void ieee80211_napi_complete(struct ieee80211_hw *hw)
486 {
487         struct ieee80211_local *local = hw_to_local(hw);
488 
489         napi_complete(&local->napi);
490 }
491 EXPORT_SYMBOL(ieee80211_napi_complete);
492 
493 /* There isn't a lot of sense in it, but you can transmit anything you like */
494 static const struct ieee80211_txrx_stypes
495 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
496         [NL80211_IFTYPE_ADHOC] = {
497                 .tx = 0xffff,
498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
499         },
500         [NL80211_IFTYPE_STATION] = {
501                 .tx = 0xffff,
502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
504         },
505         [NL80211_IFTYPE_AP] = {
506                 .tx = 0xffff,
507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
513                         BIT(IEEE80211_STYPE_ACTION >> 4),
514         },
515         [NL80211_IFTYPE_AP_VLAN] = {
516                 /* copy AP */
517                 .tx = 0xffff,
518                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
519                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
520                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
521                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
522                         BIT(IEEE80211_STYPE_AUTH >> 4) |
523                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
524                         BIT(IEEE80211_STYPE_ACTION >> 4),
525         },
526         [NL80211_IFTYPE_P2P_CLIENT] = {
527                 .tx = 0xffff,
528                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
529                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
530         },
531         [NL80211_IFTYPE_P2P_GO] = {
532                 .tx = 0xffff,
533                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
534                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
535                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
536                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
537                         BIT(IEEE80211_STYPE_AUTH >> 4) |
538                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
539                         BIT(IEEE80211_STYPE_ACTION >> 4),
540         },
541         [NL80211_IFTYPE_MESH_POINT] = {
542                 .tx = 0xffff,
543                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
544                         BIT(IEEE80211_STYPE_AUTH >> 4) |
545                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
546         },
547 };
548 
549 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
550                                         const struct ieee80211_ops *ops)
551 {
552         struct ieee80211_local *local;
553         int priv_size, i;
554         struct wiphy *wiphy;
555 
556         /* Ensure 32-byte alignment of our private data and hw private data.
557          * We use the wiphy priv data for both our ieee80211_local and for
558          * the driver's private data
559          *
560          * In memory it'll be like this:
561          *
562          * +-------------------------+
563          * | struct wiphy           |
564          * +-------------------------+
565          * | struct ieee80211_local  |
566          * +-------------------------+
567          * | driver's private data   |
568          * +-------------------------+
569          *
570          */
571         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
572 
573         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
574 
575         if (!wiphy)
576                 return NULL;
577 
578         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
579 
580         wiphy->privid = mac80211_wiphy_privid;
581 
582         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
583                         WIPHY_FLAG_4ADDR_AP |
584                         WIPHY_FLAG_4ADDR_STATION;
585 
586         if (!ops->set_key)
587                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
588 
589         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
590 
591         local = wiphy_priv(wiphy);
592 
593         local->hw.wiphy = wiphy;
594 
595         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
596 
597         BUG_ON(!ops->tx);
598         BUG_ON(!ops->start);
599         BUG_ON(!ops->stop);
600         BUG_ON(!ops->config);
601         BUG_ON(!ops->add_interface);
602         BUG_ON(!ops->remove_interface);
603         BUG_ON(!ops->configure_filter);
604         local->ops = ops;
605 
606         /* set up some defaults */
607         local->hw.queues = 1;
608         local->hw.max_rates = 1;
609         local->hw.max_report_rates = 0;
610         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
611         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
612         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
613         local->user_power_level = -1;
614         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
615         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
616 
617         INIT_LIST_HEAD(&local->interfaces);
618 
619         __hw_addr_init(&local->mc_list);
620 
621         mutex_init(&local->iflist_mtx);
622         mutex_init(&local->mtx);
623 
624         mutex_init(&local->key_mtx);
625         spin_lock_init(&local->filter_lock);
626         spin_lock_init(&local->queue_stop_reason_lock);
627 
628         /*
629          * The rx_skb_queue is only accessed from tasklets,
630          * but other SKB queues are used from within IRQ
631          * context. Therefore, this one needs a different
632          * locking class so our direct, non-irq-safe use of
633          * the queue's lock doesn't throw lockdep warnings.
634          */
635         skb_queue_head_init_class(&local->rx_skb_queue,
636                                   &ieee80211_rx_skb_queue_class);
637 
638         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
639 
640         ieee80211_work_init(local);
641 
642         INIT_WORK(&local->restart_work, ieee80211_restart_work);
643 
644         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
645         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
646         local->smps_mode = IEEE80211_SMPS_OFF;
647 
648         INIT_WORK(&local->dynamic_ps_enable_work,
649                   ieee80211_dynamic_ps_enable_work);
650         INIT_WORK(&local->dynamic_ps_disable_work,
651                   ieee80211_dynamic_ps_disable_work);
652         setup_timer(&local->dynamic_ps_timer,
653                     ieee80211_dynamic_ps_timer, (unsigned long) local);
654 
655         INIT_WORK(&local->sched_scan_stopped_work,
656                   ieee80211_sched_scan_stopped_work);
657 
658         sta_info_init(local);
659 
660         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
661                 skb_queue_head_init(&local->pending[i]);
662                 atomic_set(&local->agg_queue_stop[i], 0);
663         }
664         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
665                      (unsigned long)local);
666 
667         tasklet_init(&local->tasklet,
668                      ieee80211_tasklet_handler,
669                      (unsigned long) local);
670 
671         skb_queue_head_init(&local->skb_queue);
672         skb_queue_head_init(&local->skb_queue_unreliable);
673 
674         /* init dummy netdev for use w/ NAPI */
675         init_dummy_netdev(&local->napi_dev);
676 
677         ieee80211_led_names(local);
678 
679         ieee80211_hw_roc_setup(local);
680 
681         return local_to_hw(local);
682 }
683 EXPORT_SYMBOL(ieee80211_alloc_hw);
684 
685 int ieee80211_register_hw(struct ieee80211_hw *hw)
686 {
687         struct ieee80211_local *local = hw_to_local(hw);
688         int result, i;
689         enum ieee80211_band band;
690         int channels, max_bitrates;
691         bool supp_ht;
692         static const u32 cipher_suites[] = {
693                 /* keep WEP first, it may be removed below */
694                 WLAN_CIPHER_SUITE_WEP40,
695                 WLAN_CIPHER_SUITE_WEP104,
696                 WLAN_CIPHER_SUITE_TKIP,
697                 WLAN_CIPHER_SUITE_CCMP,
698 
699                 /* keep last -- depends on hw flags! */
700                 WLAN_CIPHER_SUITE_AES_CMAC
701         };
702 
703         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
704 #ifdef CONFIG_PM
705             && (!local->ops->suspend || !local->ops->resume)
706 #endif
707             )
708                 return -EINVAL;
709 
710         if (hw->max_report_rates == 0)
711                 hw->max_report_rates = hw->max_rates;
712 
713         /*
714          * generic code guarantees at least one band,
715          * set this very early because much code assumes
716          * that hw.conf.channel is assigned
717          */
718         channels = 0;
719         max_bitrates = 0;
720         supp_ht = false;
721         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
722                 struct ieee80211_supported_band *sband;
723 
724                 sband = local->hw.wiphy->bands[band];
725                 if (!sband)
726                         continue;
727                 if (!local->oper_channel) {
728                         /* init channel we're on */
729                         local->hw.conf.channel =
730                         local->oper_channel = &sband->channels[0];
731                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
732                 }
733                 channels += sband->n_channels;
734 
735                 if (max_bitrates < sband->n_bitrates)
736                         max_bitrates = sband->n_bitrates;
737                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
738         }
739 
740         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
741                                       sizeof(void *) * channels, GFP_KERNEL);
742         if (!local->int_scan_req)
743                 return -ENOMEM;
744 
745         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
746                 if (!local->hw.wiphy->bands[band])
747                         continue;
748                 local->int_scan_req->rates[band] = (u32) -1;
749         }
750 
751         /* if low-level driver supports AP, we also support VLAN */
752         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
753                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
754                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
755         }
756 
757         /* mac80211 always supports monitor */
758         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
759         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
760 
761         /*
762          * mac80211 doesn't support more than 1 channel, and also not more
763          * than one IBSS interface
764          */
765         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
766                 const struct ieee80211_iface_combination *c;
767                 int j;
768 
769                 c = &hw->wiphy->iface_combinations[i];
770 
771                 if (c->num_different_channels > 1)
772                         return -EINVAL;
773 
774                 for (j = 0; j < c->n_limits; j++)
775                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
776                             c->limits[j].max > 1)
777                                 return -EINVAL;
778         }
779 
780 #ifndef CONFIG_MAC80211_MESH
781         /* mesh depends on Kconfig, but drivers should set it if they want */
782         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
783 #endif
784 
785         /* if the underlying driver supports mesh, mac80211 will (at least)
786          * provide routing of mesh authentication frames to userspace */
787         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
788                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
789 
790         /* mac80211 supports control port protocol changing */
791         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
792 
793         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
794                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
795         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
796                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
797 
798         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
799              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
800              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
801 
802         /*
803          * Calculate scan IE length -- we need this to alloc
804          * memory and to subtract from the driver limit. It
805          * includes the DS Params, (extended) supported rates, and HT
806          * information -- SSID is the driver's responsibility.
807          */
808         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
809                 3 /* DS Params */;
810         if (supp_ht)
811                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
812 
813         if (!local->ops->hw_scan) {
814                 /* For hw_scan, driver needs to set these up. */
815                 local->hw.wiphy->max_scan_ssids = 4;
816                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
817         }
818 
819         /*
820          * If the driver supports any scan IEs, then assume the
821          * limit includes the IEs mac80211 will add, otherwise
822          * leave it at zero and let the driver sort it out; we
823          * still pass our IEs to the driver but userspace will
824          * not be allowed to in that case.
825          */
826         if (local->hw.wiphy->max_scan_ie_len)
827                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
828 
829         /* Set up cipher suites unless driver already did */
830         if (!local->hw.wiphy->cipher_suites) {
831                 local->hw.wiphy->cipher_suites = cipher_suites;
832                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
833                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
834                         local->hw.wiphy->n_cipher_suites--;
835         }
836         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
837                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
838                         local->hw.wiphy->cipher_suites += 2;
839                         local->hw.wiphy->n_cipher_suites -= 2;
840                 } else {
841                         u32 *suites;
842                         int r, w = 0;
843 
844                         /* Filter out WEP */
845 
846                         suites = kmemdup(
847                                 local->hw.wiphy->cipher_suites,
848                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
849                                 GFP_KERNEL);
850                         if (!suites)
851                                 return -ENOMEM;
852                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
853                                 u32 suite = local->hw.wiphy->cipher_suites[r];
854                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
855                                     suite == WLAN_CIPHER_SUITE_WEP104)
856                                         continue;
857                                 suites[w++] = suite;
858                         }
859                         local->hw.wiphy->cipher_suites = suites;
860                         local->hw.wiphy->n_cipher_suites = w;
861                         local->wiphy_ciphers_allocated = true;
862                 }
863         }
864 
865         if (!local->ops->remain_on_channel)
866                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
867 
868         if (local->ops->sched_scan_start)
869                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
870 
871         result = wiphy_register(local->hw.wiphy);
872         if (result < 0)
873                 goto fail_wiphy_register;
874 
875         /*
876          * We use the number of queues for feature tests (QoS, HT) internally
877          * so restrict them appropriately.
878          */
879         if (hw->queues > IEEE80211_MAX_QUEUES)
880                 hw->queues = IEEE80211_MAX_QUEUES;
881 
882         local->workqueue =
883                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
884         if (!local->workqueue) {
885                 result = -ENOMEM;
886                 goto fail_workqueue;
887         }
888 
889         /*
890          * The hardware needs headroom for sending the frame,
891          * and we need some headroom for passing the frame to monitor
892          * interfaces, but never both at the same time.
893          */
894 #ifndef __CHECKER__
895         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
896                         sizeof(struct ieee80211_tx_status_rtap_hdr));
897 #endif
898         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
899                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
900 
901         debugfs_hw_add(local);
902 
903         /*
904          * if the driver doesn't specify a max listen interval we
905          * use 5 which should be a safe default
906          */
907         if (local->hw.max_listen_interval == 0)
908                 local->hw.max_listen_interval = 5;
909 
910         local->hw.conf.listen_interval = local->hw.max_listen_interval;
911 
912         local->dynamic_ps_forced_timeout = -1;
913 
914         result = ieee80211_wep_init(local);
915         if (result < 0)
916                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
917                             result);
918 
919         rtnl_lock();
920 
921         result = ieee80211_init_rate_ctrl_alg(local,
922                                               hw->rate_control_algorithm);
923         if (result < 0) {
924                 wiphy_debug(local->hw.wiphy,
925                             "Failed to initialize rate control algorithm\n");
926                 goto fail_rate;
927         }
928 
929         /* add one default STA interface if supported */
930         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
931                 result = ieee80211_if_add(local, "wlan%d", NULL,
932                                           NL80211_IFTYPE_STATION, NULL);
933                 if (result)
934                         wiphy_warn(local->hw.wiphy,
935                                    "Failed to add default virtual iface\n");
936         }
937 
938         rtnl_unlock();
939 
940         ieee80211_led_init(local);
941 
942         local->network_latency_notifier.notifier_call =
943                 ieee80211_max_network_latency;
944         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
945                                      &local->network_latency_notifier);
946         if (result) {
947                 rtnl_lock();
948                 goto fail_pm_qos;
949         }
950 
951 #ifdef CONFIG_INET
952         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
953         result = register_inetaddr_notifier(&local->ifa_notifier);
954         if (result)
955                 goto fail_ifa;
956 #endif
957 
958         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
959                         local->hw.napi_weight);
960 
961         return 0;
962 
963 #ifdef CONFIG_INET
964  fail_ifa:
965         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
966                                &local->network_latency_notifier);
967         rtnl_lock();
968 #endif
969  fail_pm_qos:
970         ieee80211_led_exit(local);
971         ieee80211_remove_interfaces(local);
972  fail_rate:
973         rtnl_unlock();
974         ieee80211_wep_free(local);
975         sta_info_stop(local);
976         destroy_workqueue(local->workqueue);
977  fail_workqueue:
978         wiphy_unregister(local->hw.wiphy);
979  fail_wiphy_register:
980         if (local->wiphy_ciphers_allocated)
981                 kfree(local->hw.wiphy->cipher_suites);
982         kfree(local->int_scan_req);
983         return result;
984 }
985 EXPORT_SYMBOL(ieee80211_register_hw);
986 
987 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
988 {
989         struct ieee80211_local *local = hw_to_local(hw);
990 
991         tasklet_kill(&local->tx_pending_tasklet);
992         tasklet_kill(&local->tasklet);
993 
994         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
995                                &local->network_latency_notifier);
996 #ifdef CONFIG_INET
997         unregister_inetaddr_notifier(&local->ifa_notifier);
998 #endif
999 
1000         rtnl_lock();
1001 
1002         /*
1003          * At this point, interface list manipulations are fine
1004          * because the driver cannot be handing us frames any
1005          * more and the tasklet is killed.
1006          */
1007         ieee80211_remove_interfaces(local);
1008 
1009         rtnl_unlock();
1010 
1011         /*
1012          * Now all work items will be gone, but the
1013          * timer might still be armed, so delete it
1014          */
1015         del_timer_sync(&local->work_timer);
1016 
1017         cancel_work_sync(&local->restart_work);
1018         cancel_work_sync(&local->reconfig_filter);
1019 
1020         ieee80211_clear_tx_pending(local);
1021         rate_control_deinitialize(local);
1022 
1023         if (skb_queue_len(&local->skb_queue) ||
1024             skb_queue_len(&local->skb_queue_unreliable))
1025                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1026         skb_queue_purge(&local->skb_queue);
1027         skb_queue_purge(&local->skb_queue_unreliable);
1028         skb_queue_purge(&local->rx_skb_queue);
1029 
1030         destroy_workqueue(local->workqueue);
1031         wiphy_unregister(local->hw.wiphy);
1032         sta_info_stop(local);
1033         ieee80211_wep_free(local);
1034         ieee80211_led_exit(local);
1035         kfree(local->int_scan_req);
1036 }
1037 EXPORT_SYMBOL(ieee80211_unregister_hw);
1038 
1039 void ieee80211_free_hw(struct ieee80211_hw *hw)
1040 {
1041         struct ieee80211_local *local = hw_to_local(hw);
1042 
1043         mutex_destroy(&local->iflist_mtx);
1044         mutex_destroy(&local->mtx);
1045 
1046         if (local->wiphy_ciphers_allocated)
1047                 kfree(local->hw.wiphy->cipher_suites);
1048 
1049         wiphy_free(local->hw.wiphy);
1050 }
1051 EXPORT_SYMBOL(ieee80211_free_hw);
1052 
1053 static int __init ieee80211_init(void)
1054 {
1055         struct sk_buff *skb;
1056         int ret;
1057 
1058         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1059         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1060                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1061 
1062         ret = rc80211_minstrel_init();
1063         if (ret)
1064                 return ret;
1065 
1066         ret = rc80211_minstrel_ht_init();
1067         if (ret)
1068                 goto err_minstrel;
1069 
1070         ret = rc80211_pid_init();
1071         if (ret)
1072                 goto err_pid;
1073 
1074         ret = ieee80211_iface_init();
1075         if (ret)
1076                 goto err_netdev;
1077 
1078         return 0;
1079  err_netdev:
1080         rc80211_pid_exit();
1081  err_pid:
1082         rc80211_minstrel_ht_exit();
1083  err_minstrel:
1084         rc80211_minstrel_exit();
1085 
1086         return ret;
1087 }
1088 
1089 static void __exit ieee80211_exit(void)
1090 {
1091         rc80211_pid_exit();
1092         rc80211_minstrel_ht_exit();
1093         rc80211_minstrel_exit();
1094 
1095         if (mesh_allocated)
1096                 ieee80211s_stop();
1097 
1098         ieee80211_iface_exit();
1099 
1100         rcu_barrier();
1101 }
1102 
1103 
1104 subsys_initcall(ieee80211_init);
1105 module_exit(ieee80211_exit);
1106 
1107 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1108 MODULE_LICENSE("GPL");
1109 

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