mac80211: Do not request FIF_BCN_PRBRESP_PROMISC for HW scan.
[linux-2.6.git] / net / mac80211 / main.c
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         if (!ieee80211_sdata_running(sdata))
397                 return NOTIFY_DONE;
398
399         /* ARP filtering is only supported in managed mode */
400         if (sdata->vif.type != NL80211_IFTYPE_STATION)
401                 return NOTIFY_DONE;
402
403         idev = __in_dev_get_rtnl(sdata->dev);
404         if (!idev)
405                 return NOTIFY_DONE;
406
407         ifmgd = &sdata->u.mgd;
408         mutex_lock(&ifmgd->mtx);
409
410         /* Copy the addresses to the bss_conf list */
411         ifa = idev->ifa_list;
412         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
413                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
414                 ifa = ifa->ifa_next;
415                 c++;
416         }
417
418         /* If not all addresses fit the list, disable filtering */
419         if (ifa) {
420                 sdata->arp_filter_state = false;
421                 c = 0;
422         } else {
423                 sdata->arp_filter_state = true;
424         }
425         bss_conf->arp_addr_cnt = c;
426
427         /* Configure driver only if associated */
428         if (ifmgd->associated) {
429                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
430                 ieee80211_bss_info_change_notify(sdata,
431                                                  BSS_CHANGED_ARP_FILTER);
432         }
433
434         mutex_unlock(&ifmgd->mtx);
435
436         return NOTIFY_DONE;
437 }
438 #endif
439
440 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
441 {
442         struct ieee80211_local *local =
443                 container_of(napi, struct ieee80211_local, napi);
444
445         return local->ops->napi_poll(&local->hw, budget);
446 }
447
448 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
449 {
450         struct ieee80211_local *local = hw_to_local(hw);
451
452         napi_schedule(&local->napi);
453 }
454 EXPORT_SYMBOL(ieee80211_napi_schedule);
455
456 void ieee80211_napi_complete(struct ieee80211_hw *hw)
457 {
458         struct ieee80211_local *local = hw_to_local(hw);
459
460         napi_complete(&local->napi);
461 }
462 EXPORT_SYMBOL(ieee80211_napi_complete);
463
464 /* There isn't a lot of sense in it, but you can transmit anything you like */
465 static const struct ieee80211_txrx_stypes
466 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
467         [NL80211_IFTYPE_ADHOC] = {
468                 .tx = 0xffff,
469                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
470         },
471         [NL80211_IFTYPE_STATION] = {
472                 .tx = 0xffff,
473                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
474                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
475         },
476         [NL80211_IFTYPE_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_AP_VLAN] = {
487                 /* copy AP */
488                 .tx = 0xffff,
489                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
490                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
491                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
492                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
493                         BIT(IEEE80211_STYPE_AUTH >> 4) |
494                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
495                         BIT(IEEE80211_STYPE_ACTION >> 4),
496         },
497         [NL80211_IFTYPE_P2P_CLIENT] = {
498                 .tx = 0xffff,
499                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
500                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
501         },
502         [NL80211_IFTYPE_P2P_GO] = {
503                 .tx = 0xffff,
504                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
505                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
506                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
507                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
508                         BIT(IEEE80211_STYPE_AUTH >> 4) |
509                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
510                         BIT(IEEE80211_STYPE_ACTION >> 4),
511         },
512         [NL80211_IFTYPE_MESH_POINT] = {
513                 .tx = 0xffff,
514                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
515                         BIT(IEEE80211_STYPE_AUTH >> 4) |
516                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
517         },
518 };
519
520 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
521         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
522                              IEEE80211_HT_AMPDU_PARM_DENSITY,
523
524         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
525                                 IEEE80211_HT_CAP_MAX_AMSDU |
526                                 IEEE80211_HT_CAP_SGI_40),
527         .mcs = {
528                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
529                              0xff, 0xff, 0xff, 0xff, 0xff, },
530         },
531 };
532
533 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
534                                         const struct ieee80211_ops *ops)
535 {
536         struct ieee80211_local *local;
537         int priv_size, i;
538         struct wiphy *wiphy;
539
540         /* Ensure 32-byte alignment of our private data and hw private data.
541          * We use the wiphy priv data for both our ieee80211_local and for
542          * the driver's private data
543          *
544          * In memory it'll be like this:
545          *
546          * +-------------------------+
547          * | struct wiphy           |
548          * +-------------------------+
549          * | struct ieee80211_local  |
550          * +-------------------------+
551          * | driver's private data   |
552          * +-------------------------+
553          *
554          */
555         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
556
557         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
558
559         if (!wiphy)
560                 return NULL;
561
562         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
563
564         wiphy->privid = mac80211_wiphy_privid;
565
566         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
567                         WIPHY_FLAG_4ADDR_AP |
568                         WIPHY_FLAG_4ADDR_STATION |
569                         WIPHY_FLAG_REPORTS_OBSS |
570                         WIPHY_FLAG_OFFCHAN_TX |
571                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
572
573         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
574                           NL80211_FEATURE_HT_IBSS;
575
576         if (!ops->set_key)
577                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
578
579         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
580
581         local = wiphy_priv(wiphy);
582
583         local->hw.wiphy = wiphy;
584
585         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
586
587         BUG_ON(!ops->tx && !ops->tx_frags);
588         BUG_ON(!ops->start);
589         BUG_ON(!ops->stop);
590         BUG_ON(!ops->config);
591         BUG_ON(!ops->add_interface);
592         BUG_ON(!ops->remove_interface);
593         BUG_ON(!ops->configure_filter);
594         local->ops = ops;
595
596         /* set up some defaults */
597         local->hw.queues = 1;
598         local->hw.max_rates = 1;
599         local->hw.max_report_rates = 0;
600         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
601         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
602         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
603         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
604         local->user_power_level = -1;
605         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
606         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
607         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
608
609         INIT_LIST_HEAD(&local->interfaces);
610
611         __hw_addr_init(&local->mc_list);
612
613         mutex_init(&local->iflist_mtx);
614         mutex_init(&local->mtx);
615
616         mutex_init(&local->key_mtx);
617         spin_lock_init(&local->filter_lock);
618         spin_lock_init(&local->queue_stop_reason_lock);
619
620         /*
621          * The rx_skb_queue is only accessed from tasklets,
622          * but other SKB queues are used from within IRQ
623          * context. Therefore, this one needs a different
624          * locking class so our direct, non-irq-safe use of
625          * the queue's lock doesn't throw lockdep warnings.
626          */
627         skb_queue_head_init_class(&local->rx_skb_queue,
628                                   &ieee80211_rx_skb_queue_class);
629
630         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
631
632         ieee80211_work_init(local);
633
634         INIT_WORK(&local->restart_work, ieee80211_restart_work);
635
636         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
637         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
638         local->smps_mode = IEEE80211_SMPS_OFF;
639
640         INIT_WORK(&local->dynamic_ps_enable_work,
641                   ieee80211_dynamic_ps_enable_work);
642         INIT_WORK(&local->dynamic_ps_disable_work,
643                   ieee80211_dynamic_ps_disable_work);
644         setup_timer(&local->dynamic_ps_timer,
645                     ieee80211_dynamic_ps_timer, (unsigned long) local);
646
647         INIT_WORK(&local->sched_scan_stopped_work,
648                   ieee80211_sched_scan_stopped_work);
649
650         spin_lock_init(&local->ack_status_lock);
651         idr_init(&local->ack_status_frames);
652         /* preallocate at least one entry */
653         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
654
655         sta_info_init(local);
656
657         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
658                 skb_queue_head_init(&local->pending[i]);
659                 atomic_set(&local->agg_queue_stop[i], 0);
660         }
661         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
662                      (unsigned long)local);
663
664         tasklet_init(&local->tasklet,
665                      ieee80211_tasklet_handler,
666                      (unsigned long) local);
667
668         skb_queue_head_init(&local->skb_queue);
669         skb_queue_head_init(&local->skb_queue_unreliable);
670
671         /* init dummy netdev for use w/ NAPI */
672         init_dummy_netdev(&local->napi_dev);
673
674         ieee80211_led_names(local);
675
676         ieee80211_hw_roc_setup(local);
677
678         return local_to_hw(local);
679 }
680 EXPORT_SYMBOL(ieee80211_alloc_hw);
681
682 int ieee80211_register_hw(struct ieee80211_hw *hw)
683 {
684         struct ieee80211_local *local = hw_to_local(hw);
685         int result, i;
686         enum ieee80211_band band;
687         int channels, max_bitrates;
688         bool supp_ht;
689         static const u32 cipher_suites[] = {
690                 /* keep WEP first, it may be removed below */
691                 WLAN_CIPHER_SUITE_WEP40,
692                 WLAN_CIPHER_SUITE_WEP104,
693                 WLAN_CIPHER_SUITE_TKIP,
694                 WLAN_CIPHER_SUITE_CCMP,
695
696                 /* keep last -- depends on hw flags! */
697                 WLAN_CIPHER_SUITE_AES_CMAC
698         };
699
700         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
701 #ifdef CONFIG_PM
702             && (!local->ops->suspend || !local->ops->resume)
703 #endif
704             )
705                 return -EINVAL;
706
707         if (hw->max_report_rates == 0)
708                 hw->max_report_rates = hw->max_rates;
709
710         /*
711          * generic code guarantees at least one band,
712          * set this very early because much code assumes
713          * that hw.conf.channel is assigned
714          */
715         channels = 0;
716         max_bitrates = 0;
717         supp_ht = false;
718         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
719                 struct ieee80211_supported_band *sband;
720
721                 sband = local->hw.wiphy->bands[band];
722                 if (!sband)
723                         continue;
724                 if (!local->oper_channel) {
725                         /* init channel we're on */
726                         local->hw.conf.channel =
727                         local->oper_channel = &sband->channels[0];
728                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
729                 }
730                 channels += sband->n_channels;
731
732                 if (max_bitrates < sband->n_bitrates)
733                         max_bitrates = sband->n_bitrates;
734                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
735         }
736
737         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
738                                       sizeof(void *) * channels, GFP_KERNEL);
739         if (!local->int_scan_req)
740                 return -ENOMEM;
741
742         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
743                 if (!local->hw.wiphy->bands[band])
744                         continue;
745                 local->int_scan_req->rates[band] = (u32) -1;
746         }
747
748         /* if low-level driver supports AP, we also support VLAN */
749         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
750                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
751                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
752         }
753
754         /* mac80211 always supports monitor */
755         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
756         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
757
758         /*
759          * mac80211 doesn't support more than 1 channel, and also not more
760          * than one IBSS interface
761          */
762         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
763                 const struct ieee80211_iface_combination *c;
764                 int j;
765
766                 c = &hw->wiphy->iface_combinations[i];
767
768                 if (c->num_different_channels > 1)
769                         return -EINVAL;
770
771                 for (j = 0; j < c->n_limits; j++)
772                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
773                             c->limits[j].max > 1)
774                                 return -EINVAL;
775         }
776
777 #ifndef CONFIG_MAC80211_MESH
778         /* mesh depends on Kconfig, but drivers should set it if they want */
779         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
780 #endif
781
782         /* if the underlying driver supports mesh, mac80211 will (at least)
783          * provide routing of mesh authentication frames to userspace */
784         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
785                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
786
787         /* mac80211 supports control port protocol changing */
788         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
789
790         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
791                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
792         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
793                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
794
795         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
796              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
797              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
798
799         /*
800          * Calculate scan IE length -- we need this to alloc
801          * memory and to subtract from the driver limit. It
802          * includes the DS Params, (extended) supported rates, and HT
803          * information -- SSID is the driver's responsibility.
804          */
805         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
806                 3 /* DS Params */;
807         if (supp_ht)
808                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
809
810         if (!local->ops->hw_scan) {
811                 /* For hw_scan, driver needs to set these up. */
812                 local->hw.wiphy->max_scan_ssids = 4;
813                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
814         }
815
816         /*
817          * If the driver supports any scan IEs, then assume the
818          * limit includes the IEs mac80211 will add, otherwise
819          * leave it at zero and let the driver sort it out; we
820          * still pass our IEs to the driver but userspace will
821          * not be allowed to in that case.
822          */
823         if (local->hw.wiphy->max_scan_ie_len)
824                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
825
826         /* Set up cipher suites unless driver already did */
827         if (!local->hw.wiphy->cipher_suites) {
828                 local->hw.wiphy->cipher_suites = cipher_suites;
829                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
830                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
831                         local->hw.wiphy->n_cipher_suites--;
832         }
833         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
834                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
835                         local->hw.wiphy->cipher_suites += 2;
836                         local->hw.wiphy->n_cipher_suites -= 2;
837                 } else {
838                         u32 *suites;
839                         int r, w = 0;
840
841                         /* Filter out WEP */
842
843                         suites = kmemdup(
844                                 local->hw.wiphy->cipher_suites,
845                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
846                                 GFP_KERNEL);
847                         if (!suites)
848                                 return -ENOMEM;
849                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
850                                 u32 suite = local->hw.wiphy->cipher_suites[r];
851                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
852                                     suite == WLAN_CIPHER_SUITE_WEP104)
853                                         continue;
854                                 suites[w++] = suite;
855                         }
856                         local->hw.wiphy->cipher_suites = suites;
857                         local->hw.wiphy->n_cipher_suites = w;
858                         local->wiphy_ciphers_allocated = true;
859                 }
860         }
861
862         if (!local->ops->remain_on_channel)
863                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
864
865         if (local->ops->sched_scan_start)
866                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
867
868         /* mac80211 based drivers don't support internal TDLS setup */
869         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
870                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
871
872         result = wiphy_register(local->hw.wiphy);
873         if (result < 0)
874                 goto fail_wiphy_register;
875
876         /*
877          * We use the number of queues for feature tests (QoS, HT) internally
878          * so restrict them appropriately.
879          */
880         if (hw->queues > IEEE80211_MAX_QUEUES)
881                 hw->queues = IEEE80211_MAX_QUEUES;
882
883         local->workqueue =
884                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
885         if (!local->workqueue) {
886                 result = -ENOMEM;
887                 goto fail_workqueue;
888         }
889
890         /*
891          * The hardware needs headroom for sending the frame,
892          * and we need some headroom for passing the frame to monitor
893          * interfaces, but never both at the same time.
894          */
895         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
896                                    IEEE80211_TX_STATUS_HEADROOM);
897
898         debugfs_hw_add(local);
899
900         /*
901          * if the driver doesn't specify a max listen interval we
902          * use 5 which should be a safe default
903          */
904         if (local->hw.max_listen_interval == 0)
905                 local->hw.max_listen_interval = 5;
906
907         local->hw.conf.listen_interval = local->hw.max_listen_interval;
908
909         local->dynamic_ps_forced_timeout = -1;
910
911         result = ieee80211_wep_init(local);
912         if (result < 0)
913                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
914                             result);
915
916         rtnl_lock();
917
918         result = ieee80211_init_rate_ctrl_alg(local,
919                                               hw->rate_control_algorithm);
920         if (result < 0) {
921                 wiphy_debug(local->hw.wiphy,
922                             "Failed to initialize rate control algorithm\n");
923                 goto fail_rate;
924         }
925
926         /* add one default STA interface if supported */
927         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
928                 result = ieee80211_if_add(local, "wlan%d", NULL,
929                                           NL80211_IFTYPE_STATION, NULL);
930                 if (result)
931                         wiphy_warn(local->hw.wiphy,
932                                    "Failed to add default virtual iface\n");
933         }
934
935         rtnl_unlock();
936
937         ieee80211_led_init(local);
938
939         local->network_latency_notifier.notifier_call =
940                 ieee80211_max_network_latency;
941         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
942                                      &local->network_latency_notifier);
943         if (result) {
944                 rtnl_lock();
945                 goto fail_pm_qos;
946         }
947
948 #ifdef CONFIG_INET
949         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
950         result = register_inetaddr_notifier(&local->ifa_notifier);
951         if (result)
952                 goto fail_ifa;
953 #endif
954
955         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
956                         local->hw.napi_weight);
957
958         return 0;
959
960 #ifdef CONFIG_INET
961  fail_ifa:
962         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
963                                &local->network_latency_notifier);
964         rtnl_lock();
965 #endif
966  fail_pm_qos:
967         ieee80211_led_exit(local);
968         ieee80211_remove_interfaces(local);
969  fail_rate:
970         rtnl_unlock();
971         ieee80211_wep_free(local);
972         sta_info_stop(local);
973         destroy_workqueue(local->workqueue);
974  fail_workqueue:
975         wiphy_unregister(local->hw.wiphy);
976  fail_wiphy_register:
977         if (local->wiphy_ciphers_allocated)
978                 kfree(local->hw.wiphy->cipher_suites);
979         kfree(local->int_scan_req);
980         return result;
981 }
982 EXPORT_SYMBOL(ieee80211_register_hw);
983
984 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
985 {
986         struct ieee80211_local *local = hw_to_local(hw);
987
988         tasklet_kill(&local->tx_pending_tasklet);
989         tasklet_kill(&local->tasklet);
990
991         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
992                                &local->network_latency_notifier);
993 #ifdef CONFIG_INET
994         unregister_inetaddr_notifier(&local->ifa_notifier);
995 #endif
996
997         rtnl_lock();
998
999         /*
1000          * At this point, interface list manipulations are fine
1001          * because the driver cannot be handing us frames any
1002          * more and the tasklet is killed.
1003          */
1004         ieee80211_remove_interfaces(local);
1005
1006         rtnl_unlock();
1007
1008         /*
1009          * Now all work items will be gone, but the
1010          * timer might still be armed, so delete it
1011          */
1012         del_timer_sync(&local->work_timer);
1013
1014         cancel_work_sync(&local->restart_work);
1015         cancel_work_sync(&local->reconfig_filter);
1016
1017         ieee80211_clear_tx_pending(local);
1018         rate_control_deinitialize(local);
1019
1020         if (skb_queue_len(&local->skb_queue) ||
1021             skb_queue_len(&local->skb_queue_unreliable))
1022                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1023         skb_queue_purge(&local->skb_queue);
1024         skb_queue_purge(&local->skb_queue_unreliable);
1025         skb_queue_purge(&local->rx_skb_queue);
1026
1027         destroy_workqueue(local->workqueue);
1028         wiphy_unregister(local->hw.wiphy);
1029         sta_info_stop(local);
1030         ieee80211_wep_free(local);
1031         ieee80211_led_exit(local);
1032         kfree(local->int_scan_req);
1033 }
1034 EXPORT_SYMBOL(ieee80211_unregister_hw);
1035
1036 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1037 {
1038         WARN_ONCE(1, "Have pending ack frames!\n");
1039         kfree_skb(p);
1040         return 0;
1041 }
1042
1043 void ieee80211_free_hw(struct ieee80211_hw *hw)
1044 {
1045         struct ieee80211_local *local = hw_to_local(hw);
1046
1047         mutex_destroy(&local->iflist_mtx);
1048         mutex_destroy(&local->mtx);
1049
1050         if (local->wiphy_ciphers_allocated)
1051                 kfree(local->hw.wiphy->cipher_suites);
1052
1053         idr_for_each(&local->ack_status_frames,
1054                      ieee80211_free_ack_frame, NULL);
1055         idr_destroy(&local->ack_status_frames);
1056
1057         wiphy_free(local->hw.wiphy);
1058 }
1059 EXPORT_SYMBOL(ieee80211_free_hw);
1060
1061 static int __init ieee80211_init(void)
1062 {
1063         struct sk_buff *skb;
1064         int ret;
1065
1066         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1067         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1068                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1069
1070         ret = rc80211_minstrel_init();
1071         if (ret)
1072                 return ret;
1073
1074         ret = rc80211_minstrel_ht_init();
1075         if (ret)
1076                 goto err_minstrel;
1077
1078         ret = rc80211_pid_init();
1079         if (ret)
1080                 goto err_pid;
1081
1082         ret = ieee80211_iface_init();
1083         if (ret)
1084                 goto err_netdev;
1085
1086         return 0;
1087  err_netdev:
1088         rc80211_pid_exit();
1089  err_pid:
1090         rc80211_minstrel_ht_exit();
1091  err_minstrel:
1092         rc80211_minstrel_exit();
1093
1094         return ret;
1095 }
1096
1097 static void __exit ieee80211_exit(void)
1098 {
1099         rc80211_pid_exit();
1100         rc80211_minstrel_ht_exit();
1101         rc80211_minstrel_exit();
1102
1103         if (mesh_allocated)
1104                 ieee80211s_stop();
1105
1106         ieee80211_iface_exit();
1107
1108         rcu_barrier();
1109 }
1110
1111
1112 subsys_initcall(ieee80211_init);
1113 module_exit(ieee80211_exit);
1114
1115 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1116 MODULE_LICENSE("GPL");