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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                 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 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 96 {
 97         struct ieee80211_channel *chan;
 98         int ret = 0;
 99         int power;
100         enum nl80211_channel_type channel_type;
101         u32 offchannel_flag;
102 
103         might_sleep();
104 
105         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
106          * may need to change as well.
107          */
108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109         if (local->scan_channel) {
110                 chan = local->scan_channel;
111                 /* If scanning on oper channel, use whatever channel-type
112                  * is currently in use.
113                  */
114                 if (chan == local->oper_channel)
115                         channel_type = local->_oper_channel_type;
116                 else
117                         channel_type = NL80211_CHAN_NO_HT;
118         } else if (local->tmp_channel) {
119                 chan = local->tmp_channel;
120                 channel_type = local->tmp_channel_type;
121         } else {
122                 chan = local->oper_channel;
123                 channel_type = local->_oper_channel_type;
124         }
125 
126         if (chan != local->oper_channel ||
127             channel_type != local->_oper_channel_type)
128                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
129         else
130                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
131 
132         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
133 
134         if (offchannel_flag || chan != local->hw.conf.channel ||
135             channel_type != local->hw.conf.channel_type) {
136                 local->hw.conf.channel = chan;
137                 local->hw.conf.channel_type = channel_type;
138                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
139         }
140 
141         if (!conf_is_ht(&local->hw.conf)) {
142                 /*
143                  * mac80211.h documents that this is only valid
144                  * when the channel is set to an HT type, and
145                  * that otherwise STATIC is used.
146                  */
147                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
148         } else if (local->hw.conf.smps_mode != local->smps_mode) {
149                 local->hw.conf.smps_mode = local->smps_mode;
150                 changed |= IEEE80211_CONF_CHANGE_SMPS;
151         }
152 
153         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
154             test_bit(SCAN_HW_SCANNING, &local->scanning))
155                 power = chan->max_power;
156         else
157                 power = local->power_constr_level ?
158                         (chan->max_power - local->power_constr_level) :
159                         chan->max_power;
160 
161         if (local->user_power_level >= 0)
162                 power = min(power, local->user_power_level);
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         if (changed && local->open_count) {
170                 ret = drv_config(local, changed);
171                 /*
172                  * Goal:
173                  * HW reconfiguration should never fail, the driver has told
174                  * us what it can support so it should live up to that promise.
175                  *
176                  * Current status:
177                  * rfkill is not integrated with mac80211 and a
178                  * configuration command can thus fail if hardware rfkill
179                  * is enabled
180                  *
181                  * FIXME: integrate rfkill with mac80211 and then add this
182                  * WARN_ON() back
183                  *
184                  */
185                 /* WARN_ON(ret); */
186         }
187 
188         return ret;
189 }
190 
191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
192                                       u32 changed)
193 {
194         struct ieee80211_local *local = sdata->local;
195         static const u8 zero[ETH_ALEN] = { 0 };
196 
197         if (!changed)
198                 return;
199 
200         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
201                 /*
202                  * While not associated, claim a BSSID of all-zeroes
203                  * so that drivers don't do any weird things with the
204                  * BSSID at that time.
205                  */
206                 if (sdata->vif.bss_conf.assoc)
207                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
208                 else
209                         sdata->vif.bss_conf.bssid = zero;
210         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
211                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
212         else if (sdata->vif.type == NL80211_IFTYPE_AP)
213                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
214         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
215                 sdata->vif.bss_conf.bssid = NULL;
216         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
217                 sdata->vif.bss_conf.bssid = zero;
218         } else {
219                 WARN_ON(1);
220                 return;
221         }
222 
223         switch (sdata->vif.type) {
224         case NL80211_IFTYPE_AP:
225         case NL80211_IFTYPE_ADHOC:
226         case NL80211_IFTYPE_WDS:
227         case NL80211_IFTYPE_MESH_POINT:
228                 break;
229         default:
230                 /* do not warn to simplify caller in scan.c */
231                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
232                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
233                         return;
234                 break;
235         }
236 
237         if (changed & BSS_CHANGED_BEACON_ENABLED) {
238                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
239                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
240                         sdata->vif.bss_conf.enable_beacon = false;
241                 } else {
242                         /*
243                          * Beacon should be enabled, but AP mode must
244                          * check whether there is a beacon configured.
245                          */
246                         switch (sdata->vif.type) {
247                         case NL80211_IFTYPE_AP:
248                                 sdata->vif.bss_conf.enable_beacon =
249                                         !!sdata->u.ap.beacon;
250                                 break;
251                         case NL80211_IFTYPE_ADHOC:
252                                 sdata->vif.bss_conf.enable_beacon =
253                                         !!sdata->u.ibss.presp;
254                                 break;
255 #ifdef CONFIG_MAC80211_MESH
256                         case NL80211_IFTYPE_MESH_POINT:
257                                 sdata->vif.bss_conf.enable_beacon =
258                                         !!sdata->u.mesh.mesh_id_len;
259                                 break;
260 #endif
261                         default:
262                                 /* not reached */
263                                 WARN_ON(1);
264                                 break;
265                         }
266                 }
267         }
268 
269         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
270 }
271 
272 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
273 {
274         sdata->vif.bss_conf.use_cts_prot = false;
275         sdata->vif.bss_conf.use_short_preamble = false;
276         sdata->vif.bss_conf.use_short_slot = false;
277         return BSS_CHANGED_ERP_CTS_PROT |
278                BSS_CHANGED_ERP_PREAMBLE |
279                BSS_CHANGED_ERP_SLOT;
280 }
281 
282 static void ieee80211_tasklet_handler(unsigned long data)
283 {
284         struct ieee80211_local *local = (struct ieee80211_local *) data;
285         struct sta_info *sta, *tmp;
286         struct skb_eosp_msg_data *eosp_data;
287         struct sk_buff *skb;
288 
289         while ((skb = skb_dequeue(&local->skb_queue)) ||
290                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
291                 switch (skb->pkt_type) {
292                 case IEEE80211_RX_MSG:
293                         /* Clear skb->pkt_type in order to not confuse kernel
294                          * netstack. */
295                         skb->pkt_type = 0;
296                         ieee80211_rx(local_to_hw(local), skb);
297                         break;
298                 case IEEE80211_TX_STATUS_MSG:
299                         skb->pkt_type = 0;
300                         ieee80211_tx_status(local_to_hw(local), skb);
301                         break;
302                 case IEEE80211_EOSP_MSG:
303                         eosp_data = (void *)skb->cb;
304                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
305                                 /* skip wrong virtual interface */
306                                 if (memcmp(eosp_data->iface,
307                                            sta->sdata->vif.addr, ETH_ALEN))
308                                         continue;
309                                 clear_sta_flag(sta, WLAN_STA_SP);
310                                 break;
311                         }
312                         dev_kfree_skb(skb);
313                         break;
314                 default:
315                         WARN(1, "mac80211: Packet is of unknown type %d\n",
316                              skb->pkt_type);
317                         dev_kfree_skb(skb);
318                         break;
319                 }
320         }
321 }
322 
323 static void ieee80211_restart_work(struct work_struct *work)
324 {
325         struct ieee80211_local *local =
326                 container_of(work, struct ieee80211_local, restart_work);
327 
328         /* wait for scan work complete */
329         flush_workqueue(local->workqueue);
330 
331         mutex_lock(&local->mtx);
332         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
333              local->sched_scanning,
334                 "%s called with hardware scan in progress\n", __func__);
335         mutex_unlock(&local->mtx);
336 
337         rtnl_lock();
338         ieee80211_scan_cancel(local);
339         ieee80211_reconfig(local);
340         rtnl_unlock();
341 }
342 
343 void ieee80211_restart_hw(struct ieee80211_hw *hw)
344 {
345         struct ieee80211_local *local = hw_to_local(hw);
346 
347         trace_api_restart_hw(local);
348 
349         wiphy_info(hw->wiphy,
350                    "Hardware restart was requested\n");
351 
352         /* use this reason, ieee80211_reconfig will unblock it */
353         ieee80211_stop_queues_by_reason(hw,
354                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
355 
356         schedule_work(&local->restart_work);
357 }
358 EXPORT_SYMBOL(ieee80211_restart_hw);
359 
360 static void ieee80211_recalc_smps_work(struct work_struct *work)
361 {
362         struct ieee80211_local *local =
363                 container_of(work, struct ieee80211_local, recalc_smps);
364 
365         mutex_lock(&local->iflist_mtx);
366         ieee80211_recalc_smps(local);
367         mutex_unlock(&local->iflist_mtx);
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         },
468         [NL80211_IFTYPE_STATION] = {
469                 .tx = 0xffff,
470                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
471                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
472         },
473         [NL80211_IFTYPE_AP] = {
474                 .tx = 0xffff,
475                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
476                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
477                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
478                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
479                         BIT(IEEE80211_STYPE_AUTH >> 4) |
480                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
481                         BIT(IEEE80211_STYPE_ACTION >> 4),
482         },
483         [NL80211_IFTYPE_AP_VLAN] = {
484                 /* copy AP */
485                 .tx = 0xffff,
486                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
487                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
488                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
489                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
490                         BIT(IEEE80211_STYPE_AUTH >> 4) |
491                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
492                         BIT(IEEE80211_STYPE_ACTION >> 4),
493         },
494         [NL80211_IFTYPE_P2P_CLIENT] = {
495                 .tx = 0xffff,
496                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
497                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
498         },
499         [NL80211_IFTYPE_P2P_GO] = {
500                 .tx = 0xffff,
501                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
502                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
504                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
505                         BIT(IEEE80211_STYPE_AUTH >> 4) |
506                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
507                         BIT(IEEE80211_STYPE_ACTION >> 4),
508         },
509         [NL80211_IFTYPE_MESH_POINT] = {
510                 .tx = 0xffff,
511                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
512                         BIT(IEEE80211_STYPE_AUTH >> 4) |
513                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
514         },
515 };
516 
517 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
518         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
519                              IEEE80211_HT_AMPDU_PARM_DENSITY,
520 
521         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
522                                 IEEE80211_HT_CAP_MAX_AMSDU |
523                                 IEEE80211_HT_CAP_SGI_40),
524         .mcs = {
525                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
526                              0xff, 0xff, 0xff, 0xff, 0xff, },
527         },
528 };
529 
530 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
531                                         const struct ieee80211_ops *ops)
532 {
533         struct ieee80211_local *local;
534         int priv_size, i;
535         struct wiphy *wiphy;
536 
537         /* Ensure 32-byte alignment of our private data and hw private data.
538          * We use the wiphy priv data for both our ieee80211_local and for
539          * the driver's private data
540          *
541          * In memory it'll be like this:
542          *
543          * +-------------------------+
544          * | struct wiphy           |
545          * +-------------------------+
546          * | struct ieee80211_local  |
547          * +-------------------------+
548          * | driver's private data   |
549          * +-------------------------+
550          *
551          */
552         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
553 
554         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
555 
556         if (!wiphy)
557                 return NULL;
558 
559         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
560 
561         wiphy->privid = mac80211_wiphy_privid;
562 
563         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
564                         WIPHY_FLAG_4ADDR_AP |
565                         WIPHY_FLAG_4ADDR_STATION |
566                         WIPHY_FLAG_REPORTS_OBSS |
567                         WIPHY_FLAG_OFFCHAN_TX |
568                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
569 
570         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
571                           NL80211_FEATURE_HT_IBSS;
572 
573         if (!ops->set_key)
574                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
575 
576         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
577 
578         local = wiphy_priv(wiphy);
579 
580         local->hw.wiphy = wiphy;
581 
582         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
583 
584         BUG_ON(!ops->tx && !ops->tx_frags);
585         BUG_ON(!ops->start);
586         BUG_ON(!ops->stop);
587         BUG_ON(!ops->config);
588         BUG_ON(!ops->add_interface);
589         BUG_ON(!ops->remove_interface);
590         BUG_ON(!ops->configure_filter);
591         local->ops = ops;
592 
593         /* set up some defaults */
594         local->hw.queues = 1;
595         local->hw.max_rates = 1;
596         local->hw.max_report_rates = 0;
597         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
598         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
599         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
600         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
601         local->user_power_level = -1;
602         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
603         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
604         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
605 
606         INIT_LIST_HEAD(&local->interfaces);
607 
608         __hw_addr_init(&local->mc_list);
609 
610         mutex_init(&local->iflist_mtx);
611         mutex_init(&local->mtx);
612 
613         mutex_init(&local->key_mtx);
614         spin_lock_init(&local->filter_lock);
615         spin_lock_init(&local->queue_stop_reason_lock);
616 
617         /*
618          * The rx_skb_queue is only accessed from tasklets,
619          * but other SKB queues are used from within IRQ
620          * context. Therefore, this one needs a different
621          * locking class so our direct, non-irq-safe use of
622          * the queue's lock doesn't throw lockdep warnings.
623          */
624         skb_queue_head_init_class(&local->rx_skb_queue,
625                                   &ieee80211_rx_skb_queue_class);
626 
627         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
628 
629         ieee80211_work_init(local);
630 
631         INIT_WORK(&local->restart_work, ieee80211_restart_work);
632 
633         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
634         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
635         local->smps_mode = IEEE80211_SMPS_OFF;
636 
637         INIT_WORK(&local->dynamic_ps_enable_work,
638                   ieee80211_dynamic_ps_enable_work);
639         INIT_WORK(&local->dynamic_ps_disable_work,
640                   ieee80211_dynamic_ps_disable_work);
641         setup_timer(&local->dynamic_ps_timer,
642                     ieee80211_dynamic_ps_timer, (unsigned long) local);
643 
644         INIT_WORK(&local->sched_scan_stopped_work,
645                   ieee80211_sched_scan_stopped_work);
646 
647         spin_lock_init(&local->ack_status_lock);
648         idr_init(&local->ack_status_frames);
649         /* preallocate at least one entry */
650         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
651 
652         sta_info_init(local);
653 
654         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
655                 skb_queue_head_init(&local->pending[i]);
656                 atomic_set(&local->agg_queue_stop[i], 0);
657         }
658         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
659                      (unsigned long)local);
660 
661         tasklet_init(&local->tasklet,
662                      ieee80211_tasklet_handler,
663                      (unsigned long) local);
664 
665         skb_queue_head_init(&local->skb_queue);
666         skb_queue_head_init(&local->skb_queue_unreliable);
667 
668         /* init dummy netdev for use w/ NAPI */
669         init_dummy_netdev(&local->napi_dev);
670 
671         ieee80211_led_names(local);
672 
673         ieee80211_hw_roc_setup(local);
674 
675         return local_to_hw(local);
676 }
677 EXPORT_SYMBOL(ieee80211_alloc_hw);
678 
679 int ieee80211_register_hw(struct ieee80211_hw *hw)
680 {
681         struct ieee80211_local *local = hw_to_local(hw);
682         int result, i;
683         enum ieee80211_band band;
684         int channels, max_bitrates;
685         bool supp_ht;
686         static const u32 cipher_suites[] = {
687                 /* keep WEP first, it may be removed below */
688                 WLAN_CIPHER_SUITE_WEP40,
689                 WLAN_CIPHER_SUITE_WEP104,
690                 WLAN_CIPHER_SUITE_TKIP,
691                 WLAN_CIPHER_SUITE_CCMP,
692 
693                 /* keep last -- depends on hw flags! */
694                 WLAN_CIPHER_SUITE_AES_CMAC
695         };
696 
697         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
698 #ifdef CONFIG_PM
699             && (!local->ops->suspend || !local->ops->resume)
700 #endif
701             )
702                 return -EINVAL;
703 
704         if (hw->max_report_rates == 0)
705                 hw->max_report_rates = hw->max_rates;
706 
707         /*
708          * generic code guarantees at least one band,
709          * set this very early because much code assumes
710          * that hw.conf.channel is assigned
711          */
712         channels = 0;
713         max_bitrates = 0;
714         supp_ht = false;
715         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
716                 struct ieee80211_supported_band *sband;
717 
718                 sband = local->hw.wiphy->bands[band];
719                 if (!sband)
720                         continue;
721                 if (!local->oper_channel) {
722                         /* init channel we're on */
723                         local->hw.conf.channel =
724                         local->oper_channel = &sband->channels[0];
725                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
726                 }
727                 channels += sband->n_channels;
728 
729                 if (max_bitrates < sband->n_bitrates)
730                         max_bitrates = sband->n_bitrates;
731                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
732         }
733 
734         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
735                                       sizeof(void *) * channels, GFP_KERNEL);
736         if (!local->int_scan_req)
737                 return -ENOMEM;
738 
739         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
740                 if (!local->hw.wiphy->bands[band])
741                         continue;
742                 local->int_scan_req->rates[band] = (u32) -1;
743         }
744 
745         /* if low-level driver supports AP, we also support VLAN */
746         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
747                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
748                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
749         }
750 
751         /* mac80211 always supports monitor */
752         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
753         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
754 
755         /*
756          * mac80211 doesn't support more than 1 channel, and also not more
757          * than one IBSS interface
758          */
759         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
760                 const struct ieee80211_iface_combination *c;
761                 int j;
762 
763                 c = &hw->wiphy->iface_combinations[i];
764 
765                 if (c->num_different_channels > 1)
766                         return -EINVAL;
767 
768                 for (j = 0; j < c->n_limits; j++)
769                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
770                             c->limits[j].max > 1)
771                                 return -EINVAL;
772         }
773 
774 #ifndef CONFIG_MAC80211_MESH
775         /* mesh depends on Kconfig, but drivers should set it if they want */
776         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
777 #endif
778 
779         /* if the underlying driver supports mesh, mac80211 will (at least)
780          * provide routing of mesh authentication frames to userspace */
781         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
782                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
783 
784         /* mac80211 supports control port protocol changing */
785         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
786 
787         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
788                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
789         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
790                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
791 
792         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
793              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
794              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
795 
796         /*
797          * Calculate scan IE length -- we need this to alloc
798          * memory and to subtract from the driver limit. It
799          * includes the DS Params, (extended) supported rates, and HT
800          * information -- SSID is the driver's responsibility.
801          */
802         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
803                 3 /* DS Params */;
804         if (supp_ht)
805                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806 
807         if (!local->ops->hw_scan) {
808                 /* For hw_scan, driver needs to set these up. */
809                 local->hw.wiphy->max_scan_ssids = 4;
810                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811         }
812 
813         /*
814          * If the driver supports any scan IEs, then assume the
815          * limit includes the IEs mac80211 will add, otherwise
816          * leave it at zero and let the driver sort it out; we
817          * still pass our IEs to the driver but userspace will
818          * not be allowed to in that case.
819          */
820         if (local->hw.wiphy->max_scan_ie_len)
821                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822 
823         /* Set up cipher suites unless driver already did */
824         if (!local->hw.wiphy->cipher_suites) {
825                 local->hw.wiphy->cipher_suites = cipher_suites;
826                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
827                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
828                         local->hw.wiphy->n_cipher_suites--;
829         }
830         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
831                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
832                         local->hw.wiphy->cipher_suites += 2;
833                         local->hw.wiphy->n_cipher_suites -= 2;
834                 } else {
835                         u32 *suites;
836                         int r, w = 0;
837 
838                         /* Filter out WEP */
839 
840                         suites = kmemdup(
841                                 local->hw.wiphy->cipher_suites,
842                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
843                                 GFP_KERNEL);
844                         if (!suites)
845                                 return -ENOMEM;
846                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
847                                 u32 suite = local->hw.wiphy->cipher_suites[r];
848                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
849                                     suite == WLAN_CIPHER_SUITE_WEP104)
850                                         continue;
851                                 suites[w++] = suite;
852                         }
853                         local->hw.wiphy->cipher_suites = suites;
854                         local->hw.wiphy->n_cipher_suites = w;
855                         local->wiphy_ciphers_allocated = true;
856                 }
857         }
858 
859         if (!local->ops->remain_on_channel)
860                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
861 
862         if (local->ops->sched_scan_start)
863                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
864 
865         /* mac80211 based drivers don't support internal TDLS setup */
866         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
867                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
868 
869         result = wiphy_register(local->hw.wiphy);
870         if (result < 0)
871                 goto fail_wiphy_register;
872 
873         /*
874          * We use the number of queues for feature tests (QoS, HT) internally
875          * so restrict them appropriately.
876          */
877         if (hw->queues > IEEE80211_MAX_QUEUES)
878                 hw->queues = IEEE80211_MAX_QUEUES;
879 
880         local->workqueue =
881                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
882         if (!local->workqueue) {
883                 result = -ENOMEM;
884                 goto fail_workqueue;
885         }
886 
887         /*
888          * The hardware needs headroom for sending the frame,
889          * and we need some headroom for passing the frame to monitor
890          * interfaces, but never both at the same time.
891          */
892         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893                                    IEEE80211_TX_STATUS_HEADROOM);
894 
895         debugfs_hw_add(local);
896 
897         /*
898          * if the driver doesn't specify a max listen interval we
899          * use 5 which should be a safe default
900          */
901         if (local->hw.max_listen_interval == 0)
902                 local->hw.max_listen_interval = 5;
903 
904         local->hw.conf.listen_interval = local->hw.max_listen_interval;
905 
906         local->dynamic_ps_forced_timeout = -1;
907 
908         result = ieee80211_wep_init(local);
909         if (result < 0)
910                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
911                             result);
912 
913         ieee80211_led_init(local);
914 
915         rtnl_lock();
916 
917         result = ieee80211_init_rate_ctrl_alg(local,
918                                               hw->rate_control_algorithm);
919         if (result < 0) {
920                 wiphy_debug(local->hw.wiphy,
921                             "Failed to initialize rate control algorithm\n");
922                 goto fail_rate;
923         }
924 
925         /* add one default STA interface if supported */
926         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
927                 result = ieee80211_if_add(local, "wlan%d", NULL,
928                                           NL80211_IFTYPE_STATION, NULL);
929                 if (result)
930                         wiphy_warn(local->hw.wiphy,
931                                    "Failed to add default virtual iface\n");
932         }
933 
934         rtnl_unlock();
935 
936         local->network_latency_notifier.notifier_call =
937                 ieee80211_max_network_latency;
938         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
939                                      &local->network_latency_notifier);
940         if (result) {
941                 rtnl_lock();
942                 goto fail_pm_qos;
943         }
944 
945 #ifdef CONFIG_INET
946         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
947         result = register_inetaddr_notifier(&local->ifa_notifier);
948         if (result)
949                 goto fail_ifa;
950 #endif
951 
952         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
953                         local->hw.napi_weight);
954 
955         return 0;
956 
957 #ifdef CONFIG_INET
958  fail_ifa:
959         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
960                                &local->network_latency_notifier);
961         rtnl_lock();
962 #endif
963  fail_pm_qos:
964         ieee80211_led_exit(local);
965         ieee80211_remove_interfaces(local);
966  fail_rate:
967         rtnl_unlock();
968         ieee80211_wep_free(local);
969         sta_info_stop(local);
970         destroy_workqueue(local->workqueue);
971  fail_workqueue:
972         wiphy_unregister(local->hw.wiphy);
973  fail_wiphy_register:
974         if (local->wiphy_ciphers_allocated)
975                 kfree(local->hw.wiphy->cipher_suites);
976         kfree(local->int_scan_req);
977         return result;
978 }
979 EXPORT_SYMBOL(ieee80211_register_hw);
980 
981 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
982 {
983         struct ieee80211_local *local = hw_to_local(hw);
984 
985         tasklet_kill(&local->tx_pending_tasklet);
986         tasklet_kill(&local->tasklet);
987 
988         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
989                                &local->network_latency_notifier);
990 #ifdef CONFIG_INET
991         unregister_inetaddr_notifier(&local->ifa_notifier);
992 #endif
993 
994         rtnl_lock();
995 
996         /*
997          * At this point, interface list manipulations are fine
998          * because the driver cannot be handing us frames any
999          * more and the tasklet is killed.
1000          */
1001         ieee80211_remove_interfaces(local);
1002 
1003         rtnl_unlock();
1004 
1005         /*
1006          * Now all work items will be gone, but the
1007          * timer might still be armed, so delete it
1008          */
1009         del_timer_sync(&local->work_timer);
1010 
1011         cancel_work_sync(&local->restart_work);
1012         cancel_work_sync(&local->reconfig_filter);
1013 
1014         ieee80211_clear_tx_pending(local);
1015         rate_control_deinitialize(local);
1016 
1017         if (skb_queue_len(&local->skb_queue) ||
1018             skb_queue_len(&local->skb_queue_unreliable))
1019                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1020         skb_queue_purge(&local->skb_queue);
1021         skb_queue_purge(&local->skb_queue_unreliable);
1022         skb_queue_purge(&local->rx_skb_queue);
1023 
1024         destroy_workqueue(local->workqueue);
1025         wiphy_unregister(local->hw.wiphy);
1026         sta_info_stop(local);
1027         ieee80211_wep_free(local);
1028         ieee80211_led_exit(local);
1029         kfree(local->int_scan_req);
1030 }
1031 EXPORT_SYMBOL(ieee80211_unregister_hw);
1032 
1033 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1034 {
1035         WARN_ONCE(1, "Have pending ack frames!\n");
1036         kfree_skb(p);
1037         return 0;
1038 }
1039 
1040 void ieee80211_free_hw(struct ieee80211_hw *hw)
1041 {
1042         struct ieee80211_local *local = hw_to_local(hw);
1043 
1044         mutex_destroy(&local->iflist_mtx);
1045         mutex_destroy(&local->mtx);
1046 
1047         if (local->wiphy_ciphers_allocated)
1048                 kfree(local->hw.wiphy->cipher_suites);
1049 
1050         idr_for_each(&local->ack_status_frames,
1051                      ieee80211_free_ack_frame, NULL);
1052         idr_destroy(&local->ack_status_frames);
1053 
1054         wiphy_free(local->hw.wiphy);
1055 }
1056 EXPORT_SYMBOL(ieee80211_free_hw);
1057 
1058 static int __init ieee80211_init(void)
1059 {
1060         struct sk_buff *skb;
1061         int ret;
1062 
1063         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1064         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1065                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1066 
1067         ret = rc80211_minstrel_init();
1068         if (ret)
1069                 return ret;
1070 
1071         ret = rc80211_minstrel_ht_init();
1072         if (ret)
1073                 goto err_minstrel;
1074 
1075         ret = rc80211_pid_init();
1076         if (ret)
1077                 goto err_pid;
1078 
1079         ret = ieee80211_iface_init();
1080         if (ret)
1081                 goto err_netdev;
1082 
1083         return 0;
1084  err_netdev:
1085         rc80211_pid_exit();
1086  err_pid:
1087         rc80211_minstrel_ht_exit();
1088  err_minstrel:
1089         rc80211_minstrel_exit();
1090 
1091         return ret;
1092 }
1093 
1094 static void __exit ieee80211_exit(void)
1095 {
1096         rc80211_pid_exit();
1097         rc80211_minstrel_ht_exit();
1098         rc80211_minstrel_exit();
1099 
1100         if (mesh_allocated)
1101                 ieee80211s_stop();
1102 
1103         ieee80211_iface_exit();
1104 
1105         rcu_barrier();
1106 }
1107 
1108 
1109 subsys_initcall(ieee80211_init);
1110 module_exit(ieee80211_exit);
1111 
1112 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1113 MODULE_LICENSE("GPL");
1114 

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