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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                 power = chan->max_power;
155         else
156                 power = local->power_constr_level ?
157                         min(chan->max_power,
158                                 (chan->max_reg_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                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
202         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
203                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
204         else if (sdata->vif.type == NL80211_IFTYPE_AP)
205                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
206         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
207                 sdata->vif.bss_conf.bssid = NULL;
208         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
209                 sdata->vif.bss_conf.bssid = zero;
210         } else {
211                 WARN_ON(1);
212                 return;
213         }
214 
215         switch (sdata->vif.type) {
216         case NL80211_IFTYPE_AP:
217         case NL80211_IFTYPE_ADHOC:
218         case NL80211_IFTYPE_WDS:
219         case NL80211_IFTYPE_MESH_POINT:
220                 break;
221         default:
222                 /* do not warn to simplify caller in scan.c */
223                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
224                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
225                         return;
226                 break;
227         }
228 
229         if (changed & BSS_CHANGED_BEACON_ENABLED) {
230                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
231                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
232                         sdata->vif.bss_conf.enable_beacon = false;
233                 } else {
234                         /*
235                          * Beacon should be enabled, but AP mode must
236                          * check whether there is a beacon configured.
237                          */
238                         switch (sdata->vif.type) {
239                         case NL80211_IFTYPE_AP:
240                                 sdata->vif.bss_conf.enable_beacon =
241                                         !!sdata->u.ap.beacon;
242                                 break;
243                         case NL80211_IFTYPE_ADHOC:
244                                 sdata->vif.bss_conf.enable_beacon =
245                                         !!sdata->u.ibss.presp;
246                                 break;
247 #ifdef CONFIG_MAC80211_MESH
248                         case NL80211_IFTYPE_MESH_POINT:
249                                 sdata->vif.bss_conf.enable_beacon =
250                                         !!sdata->u.mesh.mesh_id_len;
251                                 break;
252 #endif
253                         default:
254                                 /* not reached */
255                                 WARN_ON(1);
256                                 break;
257                         }
258                 }
259         }
260 
261         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
262 }
263 
264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
265 {
266         sdata->vif.bss_conf.use_cts_prot = false;
267         sdata->vif.bss_conf.use_short_preamble = false;
268         sdata->vif.bss_conf.use_short_slot = false;
269         return BSS_CHANGED_ERP_CTS_PROT |
270                BSS_CHANGED_ERP_PREAMBLE |
271                BSS_CHANGED_ERP_SLOT;
272 }
273 
274 static void ieee80211_tasklet_handler(unsigned long data)
275 {
276         struct ieee80211_local *local = (struct ieee80211_local *) data;
277         struct sta_info *sta, *tmp;
278         struct skb_eosp_msg_data *eosp_data;
279         struct sk_buff *skb;
280 
281         while ((skb = skb_dequeue(&local->skb_queue)) ||
282                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
283                 switch (skb->pkt_type) {
284                 case IEEE80211_RX_MSG:
285                         /* Clear skb->pkt_type in order to not confuse kernel
286                          * netstack. */
287                         skb->pkt_type = 0;
288                         ieee80211_rx(&local->hw, skb);
289                         break;
290                 case IEEE80211_TX_STATUS_MSG:
291                         skb->pkt_type = 0;
292                         ieee80211_tx_status(&local->hw, skb);
293                         break;
294                 case IEEE80211_EOSP_MSG:
295                         eosp_data = (void *)skb->cb;
296                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
297                                 /* skip wrong virtual interface */
298                                 if (memcmp(eosp_data->iface,
299                                            sta->sdata->vif.addr, ETH_ALEN))
300                                         continue;
301                                 clear_sta_flag(sta, WLAN_STA_SP);
302                                 break;
303                         }
304                         dev_kfree_skb(skb);
305                         break;
306                 default:
307                         WARN(1, "mac80211: Packet is of unknown type %d\n",
308                              skb->pkt_type);
309                         dev_kfree_skb(skb);
310                         break;
311                 }
312         }
313 }
314 
315 static void ieee80211_restart_work(struct work_struct *work)
316 {
317         struct ieee80211_local *local =
318                 container_of(work, struct ieee80211_local, restart_work);
319 
320         /* wait for scan work complete */
321         flush_workqueue(local->workqueue);
322 
323         mutex_lock(&local->mtx);
324         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
325              local->sched_scanning,
326                 "%s called with hardware scan in progress\n", __func__);
327         mutex_unlock(&local->mtx);
328 
329         rtnl_lock();
330         ieee80211_scan_cancel(local);
331         ieee80211_reconfig(local);
332         rtnl_unlock();
333 }
334 
335 void ieee80211_restart_hw(struct ieee80211_hw *hw)
336 {
337         struct ieee80211_local *local = hw_to_local(hw);
338 
339         trace_api_restart_hw(local);
340 
341         wiphy_info(hw->wiphy,
342                    "Hardware restart was requested\n");
343 
344         /* use this reason, ieee80211_reconfig will unblock it */
345         ieee80211_stop_queues_by_reason(hw,
346                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
347 
348         schedule_work(&local->restart_work);
349 }
350 EXPORT_SYMBOL(ieee80211_restart_hw);
351 
352 static void ieee80211_recalc_smps_work(struct work_struct *work)
353 {
354         struct ieee80211_local *local =
355                 container_of(work, struct ieee80211_local, recalc_smps);
356 
357         mutex_lock(&local->iflist_mtx);
358         ieee80211_recalc_smps(local);
359         mutex_unlock(&local->iflist_mtx);
360 }
361 
362 #ifdef CONFIG_INET
363 static int ieee80211_ifa_changed(struct notifier_block *nb,
364                                  unsigned long data, void *arg)
365 {
366         struct in_ifaddr *ifa = arg;
367         struct ieee80211_local *local =
368                 container_of(nb, struct ieee80211_local,
369                              ifa_notifier);
370         struct net_device *ndev = ifa->ifa_dev->dev;
371         struct wireless_dev *wdev = ndev->ieee80211_ptr;
372         struct in_device *idev;
373         struct ieee80211_sub_if_data *sdata;
374         struct ieee80211_bss_conf *bss_conf;
375         struct ieee80211_if_managed *ifmgd;
376         int c = 0;
377 
378         /* Make sure it's our interface that got changed */
379         if (!wdev)
380                 return NOTIFY_DONE;
381 
382         if (wdev->wiphy != local->hw.wiphy)
383                 return NOTIFY_DONE;
384 
385         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
386         bss_conf = &sdata->vif.bss_conf;
387 
388         /* ARP filtering is only supported in managed mode */
389         if (sdata->vif.type != NL80211_IFTYPE_STATION)
390                 return NOTIFY_DONE;
391 
392         idev = __in_dev_get_rtnl(sdata->dev);
393         if (!idev)
394                 return NOTIFY_DONE;
395 
396         ifmgd = &sdata->u.mgd;
397         mutex_lock(&ifmgd->mtx);
398 
399         /* Copy the addresses to the bss_conf list */
400         ifa = idev->ifa_list;
401         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
402                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
403                 ifa = ifa->ifa_next;
404                 c++;
405         }
406 
407         /* If not all addresses fit the list, disable filtering */
408         if (ifa) {
409                 sdata->arp_filter_state = false;
410                 c = 0;
411         } else {
412                 sdata->arp_filter_state = true;
413         }
414         bss_conf->arp_addr_cnt = c;
415 
416         /* Configure driver only if associated (which also implies it is up) */
417         if (ifmgd->associated) {
418                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
419                 ieee80211_bss_info_change_notify(sdata,
420                                                  BSS_CHANGED_ARP_FILTER);
421         }
422 
423         mutex_unlock(&ifmgd->mtx);
424 
425         return NOTIFY_DONE;
426 }
427 #endif
428 
429 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
430 {
431         struct ieee80211_local *local =
432                 container_of(napi, struct ieee80211_local, napi);
433 
434         return local->ops->napi_poll(&local->hw, budget);
435 }
436 
437 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
438 {
439         struct ieee80211_local *local = hw_to_local(hw);
440 
441         napi_schedule(&local->napi);
442 }
443 EXPORT_SYMBOL(ieee80211_napi_schedule);
444 
445 void ieee80211_napi_complete(struct ieee80211_hw *hw)
446 {
447         struct ieee80211_local *local = hw_to_local(hw);
448 
449         napi_complete(&local->napi);
450 }
451 EXPORT_SYMBOL(ieee80211_napi_complete);
452 
453 /* There isn't a lot of sense in it, but you can transmit anything you like */
454 static const struct ieee80211_txrx_stypes
455 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
456         [NL80211_IFTYPE_ADHOC] = {
457                 .tx = 0xffff,
458                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
459         },
460         [NL80211_IFTYPE_STATION] = {
461                 .tx = 0xffff,
462                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
463                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
464         },
465         [NL80211_IFTYPE_AP] = {
466                 .tx = 0xffff,
467                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
468                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
469                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
470                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
471                         BIT(IEEE80211_STYPE_AUTH >> 4) |
472                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
473                         BIT(IEEE80211_STYPE_ACTION >> 4),
474         },
475         [NL80211_IFTYPE_AP_VLAN] = {
476                 /* copy AP */
477                 .tx = 0xffff,
478                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
479                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
480                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
481                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
482                         BIT(IEEE80211_STYPE_AUTH >> 4) |
483                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
484                         BIT(IEEE80211_STYPE_ACTION >> 4),
485         },
486         [NL80211_IFTYPE_P2P_CLIENT] = {
487                 .tx = 0xffff,
488                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
489                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
490         },
491         [NL80211_IFTYPE_P2P_GO] = {
492                 .tx = 0xffff,
493                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
494                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
495                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
496                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
497                         BIT(IEEE80211_STYPE_AUTH >> 4) |
498                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
499                         BIT(IEEE80211_STYPE_ACTION >> 4),
500         },
501         [NL80211_IFTYPE_MESH_POINT] = {
502                 .tx = 0xffff,
503                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
504                         BIT(IEEE80211_STYPE_AUTH >> 4) |
505                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
506         },
507 };
508 
509 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
510         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
511                              IEEE80211_HT_AMPDU_PARM_DENSITY,
512 
513         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
514                                 IEEE80211_HT_CAP_MAX_AMSDU |
515                                 IEEE80211_HT_CAP_SGI_40),
516         .mcs = {
517                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
518                              0xff, 0xff, 0xff, 0xff, 0xff, },
519         },
520 };
521 
522 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
523                                         const struct ieee80211_ops *ops)
524 {
525         struct ieee80211_local *local;
526         int priv_size, i;
527         struct wiphy *wiphy;
528 
529         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
530                 return NULL;
531 
532         /* Ensure 32-byte alignment of our private data and hw private data.
533          * We use the wiphy priv data for both our ieee80211_local and for
534          * the driver's private data
535          *
536          * In memory it'll be like this:
537          *
538          * +-------------------------+
539          * | struct wiphy           |
540          * +-------------------------+
541          * | struct ieee80211_local  |
542          * +-------------------------+
543          * | driver's private data   |
544          * +-------------------------+
545          *
546          */
547         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
548 
549         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
550 
551         if (!wiphy)
552                 return NULL;
553 
554         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
555 
556         wiphy->privid = mac80211_wiphy_privid;
557 
558         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
559                         WIPHY_FLAG_4ADDR_AP |
560                         WIPHY_FLAG_4ADDR_STATION |
561                         WIPHY_FLAG_REPORTS_OBSS |
562                         WIPHY_FLAG_OFFCHAN_TX;
563 
564         if (ops->remain_on_channel)
565                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
566 
567         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
568                           NL80211_FEATURE_HT_IBSS;
569 
570         if (!ops->set_key)
571                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
572 
573         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
574 
575         local = wiphy_priv(wiphy);
576 
577         local->hw.wiphy = wiphy;
578 
579         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
580 
581         BUG_ON(!ops->tx && !ops->tx_frags);
582         BUG_ON(!ops->start);
583         BUG_ON(!ops->stop);
584         BUG_ON(!ops->config);
585         BUG_ON(!ops->add_interface);
586         BUG_ON(!ops->remove_interface);
587         BUG_ON(!ops->configure_filter);
588         local->ops = ops;
589 
590         /* set up some defaults */
591         local->hw.queues = 1;
592         local->hw.max_rates = 1;
593         local->hw.max_report_rates = 0;
594         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
595         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
596         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
597         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
598         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
599         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
600                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
601                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
602         local->user_power_level = -1;
603         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
604 
605         INIT_LIST_HEAD(&local->interfaces);
606 
607         __hw_addr_init(&local->mc_list);
608 
609         mutex_init(&local->iflist_mtx);
610         mutex_init(&local->mtx);
611 
612         mutex_init(&local->key_mtx);
613         spin_lock_init(&local->filter_lock);
614         spin_lock_init(&local->queue_stop_reason_lock);
615 
616         /*
617          * The rx_skb_queue is only accessed from tasklets,
618          * but other SKB queues are used from within IRQ
619          * context. Therefore, this one needs a different
620          * locking class so our direct, non-irq-safe use of
621          * the queue's lock doesn't throw lockdep warnings.
622          */
623         skb_queue_head_init_class(&local->rx_skb_queue,
624                                   &ieee80211_rx_skb_queue_class);
625 
626         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
627 
628         ieee80211_work_init(local);
629 
630         INIT_WORK(&local->restart_work, ieee80211_restart_work);
631 
632         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
633         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
634         local->smps_mode = IEEE80211_SMPS_OFF;
635 
636         INIT_WORK(&local->dynamic_ps_enable_work,
637                   ieee80211_dynamic_ps_enable_work);
638         INIT_WORK(&local->dynamic_ps_disable_work,
639                   ieee80211_dynamic_ps_disable_work);
640         setup_timer(&local->dynamic_ps_timer,
641                     ieee80211_dynamic_ps_timer, (unsigned long) local);
642 
643         INIT_WORK(&local->sched_scan_stopped_work,
644                   ieee80211_sched_scan_stopped_work);
645 
646         spin_lock_init(&local->ack_status_lock);
647         idr_init(&local->ack_status_frames);
648         /* preallocate at least one entry */
649         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
650 
651         sta_info_init(local);
652 
653         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
654                 skb_queue_head_init(&local->pending[i]);
655                 atomic_set(&local->agg_queue_stop[i], 0);
656         }
657         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
658                      (unsigned long)local);
659 
660         tasklet_init(&local->tasklet,
661                      ieee80211_tasklet_handler,
662                      (unsigned long) local);
663 
664         skb_queue_head_init(&local->skb_queue);
665         skb_queue_head_init(&local->skb_queue_unreliable);
666 
667         /* init dummy netdev for use w/ NAPI */
668         init_dummy_netdev(&local->napi_dev);
669 
670         ieee80211_led_names(local);
671 
672         ieee80211_hw_roc_setup(local);
673 
674         return &local->hw;
675 }
676 EXPORT_SYMBOL(ieee80211_alloc_hw);
677 
678 int ieee80211_register_hw(struct ieee80211_hw *hw)
679 {
680         struct ieee80211_local *local = hw_to_local(hw);
681         int result, i;
682         enum ieee80211_band band;
683         int channels, max_bitrates;
684         bool supp_ht;
685         static const u32 cipher_suites[] = {
686                 /* keep WEP first, it may be removed below */
687                 WLAN_CIPHER_SUITE_WEP40,
688                 WLAN_CIPHER_SUITE_WEP104,
689                 WLAN_CIPHER_SUITE_TKIP,
690                 WLAN_CIPHER_SUITE_CCMP,
691 
692                 /* keep last -- depends on hw flags! */
693                 WLAN_CIPHER_SUITE_AES_CMAC
694         };
695 
696         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
697             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
698              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
699                 return -EINVAL;
700 
701         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
702 #ifdef CONFIG_PM
703             && (!local->ops->suspend || !local->ops->resume)
704 #endif
705             )
706                 return -EINVAL;
707 
708         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
709                 return -EINVAL;
710 
711         if (hw->max_report_rates == 0)
712                 hw->max_report_rates = hw->max_rates;
713 
714         /*
715          * generic code guarantees at least one band,
716          * set this very early because much code assumes
717          * that hw.conf.channel is assigned
718          */
719         channels = 0;
720         max_bitrates = 0;
721         supp_ht = false;
722         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
723                 struct ieee80211_supported_band *sband;
724 
725                 sband = local->hw.wiphy->bands[band];
726                 if (!sband)
727                         continue;
728                 if (!local->oper_channel) {
729                         /* init channel we're on */
730                         local->hw.conf.channel =
731                         local->oper_channel = &sband->channels[0];
732                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
733                 }
734                 channels += sband->n_channels;
735 
736                 if (max_bitrates < sband->n_bitrates)
737                         max_bitrates = sband->n_bitrates;
738                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
739         }
740 
741         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
742                                       sizeof(void *) * channels, GFP_KERNEL);
743         if (!local->int_scan_req)
744                 return -ENOMEM;
745 
746         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
747                 if (!local->hw.wiphy->bands[band])
748                         continue;
749                 local->int_scan_req->rates[band] = (u32) -1;
750         }
751 
752         /* if low-level driver supports AP, we also support VLAN */
753         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
754                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
755                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
756         }
757 
758         /* mac80211 always supports monitor */
759         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
760         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
761 
762         /*
763          * mac80211 doesn't support more than 1 channel, and also not more
764          * than one IBSS interface
765          */
766         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
767                 const struct ieee80211_iface_combination *c;
768                 int j;
769 
770                 c = &hw->wiphy->iface_combinations[i];
771 
772                 if (c->num_different_channels > 1)
773                         return -EINVAL;
774 
775                 for (j = 0; j < c->n_limits; j++)
776                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
777                             c->limits[j].max > 1)
778                                 return -EINVAL;
779         }
780 
781 #ifndef CONFIG_MAC80211_MESH
782         /* mesh depends on Kconfig, but drivers should set it if they want */
783         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
784 #endif
785 
786         /* if the underlying driver supports mesh, mac80211 will (at least)
787          * provide routing of mesh authentication frames to userspace */
788         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
789                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
790 
791         /* mac80211 supports control port protocol changing */
792         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
793 
794         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
795                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
796         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
797                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
798 
799         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
800              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
801              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
802 
803         /*
804          * Calculate scan IE length -- we need this to alloc
805          * memory and to subtract from the driver limit. It
806          * includes the DS Params, (extended) supported rates, and HT
807          * information -- SSID is the driver's responsibility.
808          */
809         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
810                 3 /* DS Params */;
811         if (supp_ht)
812                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
813 
814         if (!local->ops->hw_scan) {
815                 /* For hw_scan, driver needs to set these up. */
816                 local->hw.wiphy->max_scan_ssids = 4;
817                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
818         }
819 
820         /*
821          * If the driver supports any scan IEs, then assume the
822          * limit includes the IEs mac80211 will add, otherwise
823          * leave it at zero and let the driver sort it out; we
824          * still pass our IEs to the driver but userspace will
825          * not be allowed to in that case.
826          */
827         if (local->hw.wiphy->max_scan_ie_len)
828                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
829 
830         /* Set up cipher suites unless driver already did */
831         if (!local->hw.wiphy->cipher_suites) {
832                 local->hw.wiphy->cipher_suites = cipher_suites;
833                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
834                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
835                         local->hw.wiphy->n_cipher_suites--;
836         }
837         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
838                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
839                         local->hw.wiphy->cipher_suites += 2;
840                         local->hw.wiphy->n_cipher_suites -= 2;
841                 } else {
842                         u32 *suites;
843                         int r, w = 0;
844 
845                         /* Filter out WEP */
846 
847                         suites = kmemdup(
848                                 local->hw.wiphy->cipher_suites,
849                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
850                                 GFP_KERNEL);
851                         if (!suites)
852                                 return -ENOMEM;
853                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
854                                 u32 suite = local->hw.wiphy->cipher_suites[r];
855                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
856                                     suite == WLAN_CIPHER_SUITE_WEP104)
857                                         continue;
858                                 suites[w++] = suite;
859                         }
860                         local->hw.wiphy->cipher_suites = suites;
861                         local->hw.wiphy->n_cipher_suites = w;
862                         local->wiphy_ciphers_allocated = true;
863                 }
864         }
865 
866         if (!local->ops->remain_on_channel)
867                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
868 
869         if (local->ops->sched_scan_start)
870                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
871 
872         /* mac80211 based drivers don't support internal TDLS setup */
873         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
874                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
875 
876         result = wiphy_register(local->hw.wiphy);
877         if (result < 0)
878                 goto fail_wiphy_register;
879 
880         /*
881          * We use the number of queues for feature tests (QoS, HT) internally
882          * so restrict them appropriately.
883          */
884         if (hw->queues > IEEE80211_MAX_QUEUES)
885                 hw->queues = IEEE80211_MAX_QUEUES;
886 
887         local->workqueue =
888                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
889         if (!local->workqueue) {
890                 result = -ENOMEM;
891                 goto fail_workqueue;
892         }
893 
894         /*
895          * The hardware needs headroom for sending the frame,
896          * and we need some headroom for passing the frame to monitor
897          * interfaces, but never both at the same time.
898          */
899         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
900                                    IEEE80211_TX_STATUS_HEADROOM);
901 
902         debugfs_hw_add(local);
903 
904         /*
905          * if the driver doesn't specify a max listen interval we
906          * use 5 which should be a safe default
907          */
908         if (local->hw.max_listen_interval == 0)
909                 local->hw.max_listen_interval = 5;
910 
911         local->hw.conf.listen_interval = local->hw.max_listen_interval;
912 
913         local->dynamic_ps_forced_timeout = -1;
914 
915         result = ieee80211_wep_init(local);
916         if (result < 0)
917                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
918                             result);
919 
920         ieee80211_led_init(local);
921 
922         rtnl_lock();
923 
924         result = ieee80211_init_rate_ctrl_alg(local,
925                                               hw->rate_control_algorithm);
926         if (result < 0) {
927                 wiphy_debug(local->hw.wiphy,
928                             "Failed to initialize rate control algorithm\n");
929                 goto fail_rate;
930         }
931 
932         /* add one default STA interface if supported */
933         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
934                 result = ieee80211_if_add(local, "wlan%d", NULL,
935                                           NL80211_IFTYPE_STATION, NULL);
936                 if (result)
937                         wiphy_warn(local->hw.wiphy,
938                                    "Failed to add default virtual iface\n");
939         }
940 
941         rtnl_unlock();
942 
943         local->network_latency_notifier.notifier_call =
944                 ieee80211_max_network_latency;
945         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
946                                      &local->network_latency_notifier);
947         if (result) {
948                 rtnl_lock();
949                 goto fail_pm_qos;
950         }
951 
952 #ifdef CONFIG_INET
953         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
954         result = register_inetaddr_notifier(&local->ifa_notifier);
955         if (result)
956                 goto fail_ifa;
957 #endif
958 
959         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
960                         local->hw.napi_weight);
961 
962         return 0;
963 
964 #ifdef CONFIG_INET
965  fail_ifa:
966         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
967                                &local->network_latency_notifier);
968         rtnl_lock();
969 #endif
970  fail_pm_qos:
971         ieee80211_led_exit(local);
972         ieee80211_remove_interfaces(local);
973  fail_rate:
974         rtnl_unlock();
975         ieee80211_wep_free(local);
976         sta_info_stop(local);
977         destroy_workqueue(local->workqueue);
978  fail_workqueue:
979         wiphy_unregister(local->hw.wiphy);
980  fail_wiphy_register:
981         if (local->wiphy_ciphers_allocated)
982                 kfree(local->hw.wiphy->cipher_suites);
983         kfree(local->int_scan_req);
984         return result;
985 }
986 EXPORT_SYMBOL(ieee80211_register_hw);
987 
988 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
989 {
990         struct ieee80211_local *local = hw_to_local(hw);
991 
992         tasklet_kill(&local->tx_pending_tasklet);
993         tasklet_kill(&local->tasklet);
994 
995         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
996                                &local->network_latency_notifier);
997 #ifdef CONFIG_INET
998         unregister_inetaddr_notifier(&local->ifa_notifier);
999 #endif
1000 
1001         rtnl_lock();
1002 
1003         /*
1004          * At this point, interface list manipulations are fine
1005          * because the driver cannot be handing us frames any
1006          * more and the tasklet is killed.
1007          */
1008         ieee80211_remove_interfaces(local);
1009 
1010         rtnl_unlock();
1011 
1012         /*
1013          * Now all work items will be gone, but the
1014          * timer might still be armed, so delete it
1015          */
1016         del_timer_sync(&local->work_timer);
1017 
1018         cancel_work_sync(&local->restart_work);
1019         cancel_work_sync(&local->reconfig_filter);
1020 
1021         ieee80211_clear_tx_pending(local);
1022         rate_control_deinitialize(local);
1023 
1024         if (skb_queue_len(&local->skb_queue) ||
1025             skb_queue_len(&local->skb_queue_unreliable))
1026                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1027         skb_queue_purge(&local->skb_queue);
1028         skb_queue_purge(&local->skb_queue_unreliable);
1029         skb_queue_purge(&local->rx_skb_queue);
1030 
1031         destroy_workqueue(local->workqueue);
1032         wiphy_unregister(local->hw.wiphy);
1033         sta_info_stop(local);
1034         ieee80211_wep_free(local);
1035         ieee80211_led_exit(local);
1036         kfree(local->int_scan_req);
1037 }
1038 EXPORT_SYMBOL(ieee80211_unregister_hw);
1039 
1040 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1041 {
1042         WARN_ONCE(1, "Have pending ack frames!\n");
1043         kfree_skb(p);
1044         return 0;
1045 }
1046 
1047 void ieee80211_free_hw(struct ieee80211_hw *hw)
1048 {
1049         struct ieee80211_local *local = hw_to_local(hw);
1050 
1051         mutex_destroy(&local->iflist_mtx);
1052         mutex_destroy(&local->mtx);
1053 
1054         if (local->wiphy_ciphers_allocated)
1055                 kfree(local->hw.wiphy->cipher_suites);
1056 
1057         idr_for_each(&local->ack_status_frames,
1058                      ieee80211_free_ack_frame, NULL);
1059         idr_destroy(&local->ack_status_frames);
1060 
1061         wiphy_free(local->hw.wiphy);
1062 }
1063 EXPORT_SYMBOL(ieee80211_free_hw);
1064 
1065 static int __init ieee80211_init(void)
1066 {
1067         struct sk_buff *skb;
1068         int ret;
1069 
1070         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1071         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1072                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1073 
1074         ret = rc80211_minstrel_init();
1075         if (ret)
1076                 return ret;
1077 
1078         ret = rc80211_minstrel_ht_init();
1079         if (ret)
1080                 goto err_minstrel;
1081 
1082         ret = rc80211_pid_init();
1083         if (ret)
1084                 goto err_pid;
1085 
1086         ret = ieee80211_iface_init();
1087         if (ret)
1088                 goto err_netdev;
1089 
1090         return 0;
1091  err_netdev:
1092         rc80211_pid_exit();
1093  err_pid:
1094         rc80211_minstrel_ht_exit();
1095  err_minstrel:
1096         rc80211_minstrel_exit();
1097 
1098         return ret;
1099 }
1100 
1101 static void __exit ieee80211_exit(void)
1102 {
1103         rc80211_pid_exit();
1104         rc80211_minstrel_ht_exit();
1105         rc80211_minstrel_exit();
1106 
1107         if (mesh_allocated)
1108                 ieee80211s_stop();
1109 
1110         ieee80211_iface_exit();
1111 
1112         rcu_barrier();
1113 }
1114 
1115 
1116 subsys_initcall(ieee80211_init);
1117 module_exit(ieee80211_exit);
1118 
1119 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1120 MODULE_LICENSE("GPL");
1121 

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