mac80211: add sta_state callback
[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                         min(chan->max_power,
159                                 (chan->max_reg_power  - local->power_constr_level)) :
160                         chan->max_power;
161
162         if (local->user_power_level >= 0)
163                 power = min(power, local->user_power_level);
164
165         if (local->hw.conf.power_level != power) {
166                 changed |= IEEE80211_CONF_CHANGE_POWER;
167                 local->hw.conf.power_level = power;
168         }
169
170         if (changed && local->open_count) {
171                 ret = drv_config(local, changed);
172                 /*
173                  * Goal:
174                  * HW reconfiguration should never fail, the driver has told
175                  * us what it can support so it should live up to that promise.
176                  *
177                  * Current status:
178                  * rfkill is not integrated with mac80211 and a
179                  * configuration command can thus fail if hardware rfkill
180                  * is enabled
181                  *
182                  * FIXME: integrate rfkill with mac80211 and then add this
183                  * WARN_ON() back
184                  *
185                  */
186                 /* WARN_ON(ret); */
187         }
188
189         return ret;
190 }
191
192 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
193                                       u32 changed)
194 {
195         struct ieee80211_local *local = sdata->local;
196         static const u8 zero[ETH_ALEN] = { 0 };
197
198         if (!changed)
199                 return;
200
201         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
202                 /*
203                  * While not associated, claim a BSSID of all-zeroes
204                  * so that drivers don't do any weird things with the
205                  * BSSID at that time.
206                  */
207                 if (sdata->vif.bss_conf.assoc)
208                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
209                 else
210                         sdata->vif.bss_conf.bssid = zero;
211         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
212                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
213         else if (sdata->vif.type == NL80211_IFTYPE_AP)
214                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
215         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
216                 sdata->vif.bss_conf.bssid = NULL;
217         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
218                 sdata->vif.bss_conf.bssid = zero;
219         } else {
220                 WARN_ON(1);
221                 return;
222         }
223
224         switch (sdata->vif.type) {
225         case NL80211_IFTYPE_AP:
226         case NL80211_IFTYPE_ADHOC:
227         case NL80211_IFTYPE_WDS:
228         case NL80211_IFTYPE_MESH_POINT:
229                 break;
230         default:
231                 /* do not warn to simplify caller in scan.c */
232                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
233                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
234                         return;
235                 break;
236         }
237
238         if (changed & BSS_CHANGED_BEACON_ENABLED) {
239                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
240                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
241                         sdata->vif.bss_conf.enable_beacon = false;
242                 } else {
243                         /*
244                          * Beacon should be enabled, but AP mode must
245                          * check whether there is a beacon configured.
246                          */
247                         switch (sdata->vif.type) {
248                         case NL80211_IFTYPE_AP:
249                                 sdata->vif.bss_conf.enable_beacon =
250                                         !!sdata->u.ap.beacon;
251                                 break;
252                         case NL80211_IFTYPE_ADHOC:
253                                 sdata->vif.bss_conf.enable_beacon =
254                                         !!sdata->u.ibss.presp;
255                                 break;
256 #ifdef CONFIG_MAC80211_MESH
257                         case NL80211_IFTYPE_MESH_POINT:
258                                 sdata->vif.bss_conf.enable_beacon =
259                                         !!sdata->u.mesh.mesh_id_len;
260                                 break;
261 #endif
262                         default:
263                                 /* not reached */
264                                 WARN_ON(1);
265                                 break;
266                         }
267                 }
268         }
269
270         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
271 }
272
273 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
274 {
275         sdata->vif.bss_conf.use_cts_prot = false;
276         sdata->vif.bss_conf.use_short_preamble = false;
277         sdata->vif.bss_conf.use_short_slot = false;
278         return BSS_CHANGED_ERP_CTS_PROT |
279                BSS_CHANGED_ERP_PREAMBLE |
280                BSS_CHANGED_ERP_SLOT;
281 }
282
283 static void ieee80211_tasklet_handler(unsigned long data)
284 {
285         struct ieee80211_local *local = (struct ieee80211_local *) data;
286         struct sta_info *sta, *tmp;
287         struct skb_eosp_msg_data *eosp_data;
288         struct sk_buff *skb;
289
290         while ((skb = skb_dequeue(&local->skb_queue)) ||
291                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
292                 switch (skb->pkt_type) {
293                 case IEEE80211_RX_MSG:
294                         /* Clear skb->pkt_type in order to not confuse kernel
295                          * netstack. */
296                         skb->pkt_type = 0;
297                         ieee80211_rx(local_to_hw(local), skb);
298                         break;
299                 case IEEE80211_TX_STATUS_MSG:
300                         skb->pkt_type = 0;
301                         ieee80211_tx_status(local_to_hw(local), skb);
302                         break;
303                 case IEEE80211_EOSP_MSG:
304                         eosp_data = (void *)skb->cb;
305                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
306                                 /* skip wrong virtual interface */
307                                 if (memcmp(eosp_data->iface,
308                                            sta->sdata->vif.addr, ETH_ALEN))
309                                         continue;
310                                 clear_sta_flag(sta, WLAN_STA_SP);
311                                 break;
312                         }
313                         dev_kfree_skb(skb);
314                         break;
315                 default:
316                         WARN(1, "mac80211: Packet is of unknown type %d\n",
317                              skb->pkt_type);
318                         dev_kfree_skb(skb);
319                         break;
320                 }
321         }
322 }
323
324 static void ieee80211_restart_work(struct work_struct *work)
325 {
326         struct ieee80211_local *local =
327                 container_of(work, struct ieee80211_local, restart_work);
328
329         /* wait for scan work complete */
330         flush_workqueue(local->workqueue);
331
332         mutex_lock(&local->mtx);
333         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
334              local->sched_scanning,
335                 "%s called with hardware scan in progress\n", __func__);
336         mutex_unlock(&local->mtx);
337
338         rtnl_lock();
339         ieee80211_scan_cancel(local);
340         ieee80211_reconfig(local);
341         rtnl_unlock();
342 }
343
344 void ieee80211_restart_hw(struct ieee80211_hw *hw)
345 {
346         struct ieee80211_local *local = hw_to_local(hw);
347
348         trace_api_restart_hw(local);
349
350         wiphy_info(hw->wiphy,
351                    "Hardware restart was requested\n");
352
353         /* use this reason, ieee80211_reconfig will unblock it */
354         ieee80211_stop_queues_by_reason(hw,
355                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
356
357         schedule_work(&local->restart_work);
358 }
359 EXPORT_SYMBOL(ieee80211_restart_hw);
360
361 static void ieee80211_recalc_smps_work(struct work_struct *work)
362 {
363         struct ieee80211_local *local =
364                 container_of(work, struct ieee80211_local, recalc_smps);
365
366         mutex_lock(&local->iflist_mtx);
367         ieee80211_recalc_smps(local);
368         mutex_unlock(&local->iflist_mtx);
369 }
370
371 #ifdef CONFIG_INET
372 static int ieee80211_ifa_changed(struct notifier_block *nb,
373                                  unsigned long data, void *arg)
374 {
375         struct in_ifaddr *ifa = arg;
376         struct ieee80211_local *local =
377                 container_of(nb, struct ieee80211_local,
378                              ifa_notifier);
379         struct net_device *ndev = ifa->ifa_dev->dev;
380         struct wireless_dev *wdev = ndev->ieee80211_ptr;
381         struct in_device *idev;
382         struct ieee80211_sub_if_data *sdata;
383         struct ieee80211_bss_conf *bss_conf;
384         struct ieee80211_if_managed *ifmgd;
385         int c = 0;
386
387         /* Make sure it's our interface that got changed */
388         if (!wdev)
389                 return NOTIFY_DONE;
390
391         if (wdev->wiphy != local->hw.wiphy)
392                 return NOTIFY_DONE;
393
394         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
395         bss_conf = &sdata->vif.bss_conf;
396
397         /* ARP filtering is only supported in managed mode */
398         if (sdata->vif.type != NL80211_IFTYPE_STATION)
399                 return NOTIFY_DONE;
400
401         idev = __in_dev_get_rtnl(sdata->dev);
402         if (!idev)
403                 return NOTIFY_DONE;
404
405         ifmgd = &sdata->u.mgd;
406         mutex_lock(&ifmgd->mtx);
407
408         /* Copy the addresses to the bss_conf list */
409         ifa = idev->ifa_list;
410         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
411                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
412                 ifa = ifa->ifa_next;
413                 c++;
414         }
415
416         /* If not all addresses fit the list, disable filtering */
417         if (ifa) {
418                 sdata->arp_filter_state = false;
419                 c = 0;
420         } else {
421                 sdata->arp_filter_state = true;
422         }
423         bss_conf->arp_addr_cnt = c;
424
425         /* Configure driver only if associated (which also implies it is up) */
426         if (ifmgd->associated) {
427                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
428                 ieee80211_bss_info_change_notify(sdata,
429                                                  BSS_CHANGED_ARP_FILTER);
430         }
431
432         mutex_unlock(&ifmgd->mtx);
433
434         return NOTIFY_DONE;
435 }
436 #endif
437
438 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
439 {
440         struct ieee80211_local *local =
441                 container_of(napi, struct ieee80211_local, napi);
442
443         return local->ops->napi_poll(&local->hw, budget);
444 }
445
446 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
447 {
448         struct ieee80211_local *local = hw_to_local(hw);
449
450         napi_schedule(&local->napi);
451 }
452 EXPORT_SYMBOL(ieee80211_napi_schedule);
453
454 void ieee80211_napi_complete(struct ieee80211_hw *hw)
455 {
456         struct ieee80211_local *local = hw_to_local(hw);
457
458         napi_complete(&local->napi);
459 }
460 EXPORT_SYMBOL(ieee80211_napi_complete);
461
462 /* There isn't a lot of sense in it, but you can transmit anything you like */
463 static const struct ieee80211_txrx_stypes
464 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
465         [NL80211_IFTYPE_ADHOC] = {
466                 .tx = 0xffff,
467                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
468         },
469         [NL80211_IFTYPE_STATION] = {
470                 .tx = 0xffff,
471                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
472                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
473         },
474         [NL80211_IFTYPE_AP] = {
475                 .tx = 0xffff,
476                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
477                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
478                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
479                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
480                         BIT(IEEE80211_STYPE_AUTH >> 4) |
481                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
482                         BIT(IEEE80211_STYPE_ACTION >> 4),
483         },
484         [NL80211_IFTYPE_AP_VLAN] = {
485                 /* copy AP */
486                 .tx = 0xffff,
487                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
488                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
489                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
490                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
491                         BIT(IEEE80211_STYPE_AUTH >> 4) |
492                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
493                         BIT(IEEE80211_STYPE_ACTION >> 4),
494         },
495         [NL80211_IFTYPE_P2P_CLIENT] = {
496                 .tx = 0xffff,
497                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
498                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
499         },
500         [NL80211_IFTYPE_P2P_GO] = {
501                 .tx = 0xffff,
502                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
503                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
504                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
505                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
506                         BIT(IEEE80211_STYPE_AUTH >> 4) |
507                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
508                         BIT(IEEE80211_STYPE_ACTION >> 4),
509         },
510         [NL80211_IFTYPE_MESH_POINT] = {
511                 .tx = 0xffff,
512                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
513                         BIT(IEEE80211_STYPE_AUTH >> 4) |
514                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
515         },
516 };
517
518 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
519         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
520                              IEEE80211_HT_AMPDU_PARM_DENSITY,
521
522         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
523                                 IEEE80211_HT_CAP_MAX_AMSDU |
524                                 IEEE80211_HT_CAP_SGI_40),
525         .mcs = {
526                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
527                              0xff, 0xff, 0xff, 0xff, 0xff, },
528         },
529 };
530
531 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
532                                         const struct ieee80211_ops *ops)
533 {
534         struct ieee80211_local *local;
535         int priv_size, i;
536         struct wiphy *wiphy;
537
538         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
539                 return NULL;
540
541         /* Ensure 32-byte alignment of our private data and hw private data.
542          * We use the wiphy priv data for both our ieee80211_local and for
543          * the driver's private data
544          *
545          * In memory it'll be like this:
546          *
547          * +-------------------------+
548          * | struct wiphy           |
549          * +-------------------------+
550          * | struct ieee80211_local  |
551          * +-------------------------+
552          * | driver's private data   |
553          * +-------------------------+
554          *
555          */
556         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
557
558         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
559
560         if (!wiphy)
561                 return NULL;
562
563         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
564
565         wiphy->privid = mac80211_wiphy_privid;
566
567         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
568                         WIPHY_FLAG_4ADDR_AP |
569                         WIPHY_FLAG_4ADDR_STATION |
570                         WIPHY_FLAG_REPORTS_OBSS |
571                         WIPHY_FLAG_OFFCHAN_TX |
572                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
573
574         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
575                           NL80211_FEATURE_HT_IBSS;
576
577         if (!ops->set_key)
578                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
579
580         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
581
582         local = wiphy_priv(wiphy);
583
584         local->hw.wiphy = wiphy;
585
586         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
587
588         BUG_ON(!ops->tx && !ops->tx_frags);
589         BUG_ON(!ops->start);
590         BUG_ON(!ops->stop);
591         BUG_ON(!ops->config);
592         BUG_ON(!ops->add_interface);
593         BUG_ON(!ops->remove_interface);
594         BUG_ON(!ops->configure_filter);
595         local->ops = ops;
596
597         /* set up some defaults */
598         local->hw.queues = 1;
599         local->hw.max_rates = 1;
600         local->hw.max_report_rates = 0;
601         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
602         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
603         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
604         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
605         local->user_power_level = -1;
606         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
607         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
608         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
609
610         INIT_LIST_HEAD(&local->interfaces);
611
612         __hw_addr_init(&local->mc_list);
613
614         mutex_init(&local->iflist_mtx);
615         mutex_init(&local->mtx);
616
617         mutex_init(&local->key_mtx);
618         spin_lock_init(&local->filter_lock);
619         spin_lock_init(&local->queue_stop_reason_lock);
620
621         /*
622          * The rx_skb_queue is only accessed from tasklets,
623          * but other SKB queues are used from within IRQ
624          * context. Therefore, this one needs a different
625          * locking class so our direct, non-irq-safe use of
626          * the queue's lock doesn't throw lockdep warnings.
627          */
628         skb_queue_head_init_class(&local->rx_skb_queue,
629                                   &ieee80211_rx_skb_queue_class);
630
631         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
632
633         ieee80211_work_init(local);
634
635         INIT_WORK(&local->restart_work, ieee80211_restart_work);
636
637         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
638         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
639         local->smps_mode = IEEE80211_SMPS_OFF;
640
641         INIT_WORK(&local->dynamic_ps_enable_work,
642                   ieee80211_dynamic_ps_enable_work);
643         INIT_WORK(&local->dynamic_ps_disable_work,
644                   ieee80211_dynamic_ps_disable_work);
645         setup_timer(&local->dynamic_ps_timer,
646                     ieee80211_dynamic_ps_timer, (unsigned long) local);
647
648         INIT_WORK(&local->sched_scan_stopped_work,
649                   ieee80211_sched_scan_stopped_work);
650
651         spin_lock_init(&local->ack_status_lock);
652         idr_init(&local->ack_status_frames);
653         /* preallocate at least one entry */
654         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
655
656         sta_info_init(local);
657
658         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
659                 skb_queue_head_init(&local->pending[i]);
660                 atomic_set(&local->agg_queue_stop[i], 0);
661         }
662         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
663                      (unsigned long)local);
664
665         tasklet_init(&local->tasklet,
666                      ieee80211_tasklet_handler,
667                      (unsigned long) local);
668
669         skb_queue_head_init(&local->skb_queue);
670         skb_queue_head_init(&local->skb_queue_unreliable);
671
672         /* init dummy netdev for use w/ NAPI */
673         init_dummy_netdev(&local->napi_dev);
674
675         ieee80211_led_names(local);
676
677         ieee80211_hw_roc_setup(local);
678
679         return local_to_hw(local);
680 }
681 EXPORT_SYMBOL(ieee80211_alloc_hw);
682
683 int ieee80211_register_hw(struct ieee80211_hw *hw)
684 {
685         struct ieee80211_local *local = hw_to_local(hw);
686         int result, i;
687         enum ieee80211_band band;
688         int channels, max_bitrates;
689         bool supp_ht;
690         static const u32 cipher_suites[] = {
691                 /* keep WEP first, it may be removed below */
692                 WLAN_CIPHER_SUITE_WEP40,
693                 WLAN_CIPHER_SUITE_WEP104,
694                 WLAN_CIPHER_SUITE_TKIP,
695                 WLAN_CIPHER_SUITE_CCMP,
696
697                 /* keep last -- depends on hw flags! */
698                 WLAN_CIPHER_SUITE_AES_CMAC
699         };
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->max_report_rates == 0)
709                 hw->max_report_rates = hw->max_rates;
710
711         /*
712          * generic code guarantees at least one band,
713          * set this very early because much code assumes
714          * that hw.conf.channel is assigned
715          */
716         channels = 0;
717         max_bitrates = 0;
718         supp_ht = false;
719         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
720                 struct ieee80211_supported_band *sband;
721
722                 sband = local->hw.wiphy->bands[band];
723                 if (!sband)
724                         continue;
725                 if (!local->oper_channel) {
726                         /* init channel we're on */
727                         local->hw.conf.channel =
728                         local->oper_channel = &sband->channels[0];
729                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
730                 }
731                 channels += sband->n_channels;
732
733                 if (max_bitrates < sband->n_bitrates)
734                         max_bitrates = sband->n_bitrates;
735                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
736         }
737
738         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
739                                       sizeof(void *) * channels, GFP_KERNEL);
740         if (!local->int_scan_req)
741                 return -ENOMEM;
742
743         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
744                 if (!local->hw.wiphy->bands[band])
745                         continue;
746                 local->int_scan_req->rates[band] = (u32) -1;
747         }
748
749         /* if low-level driver supports AP, we also support VLAN */
750         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
751                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
752                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
753         }
754
755         /* mac80211 always supports monitor */
756         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
757         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
758
759         /*
760          * mac80211 doesn't support more than 1 channel, and also not more
761          * than one IBSS interface
762          */
763         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
764                 const struct ieee80211_iface_combination *c;
765                 int j;
766
767                 c = &hw->wiphy->iface_combinations[i];
768
769                 if (c->num_different_channels > 1)
770                         return -EINVAL;
771
772                 for (j = 0; j < c->n_limits; j++)
773                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
774                             c->limits[j].max > 1)
775                                 return -EINVAL;
776         }
777
778 #ifndef CONFIG_MAC80211_MESH
779         /* mesh depends on Kconfig, but drivers should set it if they want */
780         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
781 #endif
782
783         /* if the underlying driver supports mesh, mac80211 will (at least)
784          * provide routing of mesh authentication frames to userspace */
785         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
786                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
787
788         /* mac80211 supports control port protocol changing */
789         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
790
791         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
792                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
793         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
794                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
795
796         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
797              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
798              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
799
800         /*
801          * Calculate scan IE length -- we need this to alloc
802          * memory and to subtract from the driver limit. It
803          * includes the DS Params, (extended) supported rates, and HT
804          * information -- SSID is the driver's responsibility.
805          */
806         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
807                 3 /* DS Params */;
808         if (supp_ht)
809                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
810
811         if (!local->ops->hw_scan) {
812                 /* For hw_scan, driver needs to set these up. */
813                 local->hw.wiphy->max_scan_ssids = 4;
814                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
815         }
816
817         /*
818          * If the driver supports any scan IEs, then assume the
819          * limit includes the IEs mac80211 will add, otherwise
820          * leave it at zero and let the driver sort it out; we
821          * still pass our IEs to the driver but userspace will
822          * not be allowed to in that case.
823          */
824         if (local->hw.wiphy->max_scan_ie_len)
825                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
826
827         /* Set up cipher suites unless driver already did */
828         if (!local->hw.wiphy->cipher_suites) {
829                 local->hw.wiphy->cipher_suites = cipher_suites;
830                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
831                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
832                         local->hw.wiphy->n_cipher_suites--;
833         }
834         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
835                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
836                         local->hw.wiphy->cipher_suites += 2;
837                         local->hw.wiphy->n_cipher_suites -= 2;
838                 } else {
839                         u32 *suites;
840                         int r, w = 0;
841
842                         /* Filter out WEP */
843
844                         suites = kmemdup(
845                                 local->hw.wiphy->cipher_suites,
846                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
847                                 GFP_KERNEL);
848                         if (!suites)
849                                 return -ENOMEM;
850                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
851                                 u32 suite = local->hw.wiphy->cipher_suites[r];
852                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
853                                     suite == WLAN_CIPHER_SUITE_WEP104)
854                                         continue;
855                                 suites[w++] = suite;
856                         }
857                         local->hw.wiphy->cipher_suites = suites;
858                         local->hw.wiphy->n_cipher_suites = w;
859                         local->wiphy_ciphers_allocated = true;
860                 }
861         }
862
863         if (!local->ops->remain_on_channel)
864                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
865
866         if (local->ops->sched_scan_start)
867                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
868
869         /* mac80211 based drivers don't support internal TDLS setup */
870         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
871                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
872
873         result = wiphy_register(local->hw.wiphy);
874         if (result < 0)
875                 goto fail_wiphy_register;
876
877         /*
878          * We use the number of queues for feature tests (QoS, HT) internally
879          * so restrict them appropriately.
880          */
881         if (hw->queues > IEEE80211_MAX_QUEUES)
882                 hw->queues = IEEE80211_MAX_QUEUES;
883
884         local->workqueue =
885                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
886         if (!local->workqueue) {
887                 result = -ENOMEM;
888                 goto fail_workqueue;
889         }
890
891         /*
892          * The hardware needs headroom for sending the frame,
893          * and we need some headroom for passing the frame to monitor
894          * interfaces, but never both at the same time.
895          */
896         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
897                                    IEEE80211_TX_STATUS_HEADROOM);
898
899         debugfs_hw_add(local);
900
901         /*
902          * if the driver doesn't specify a max listen interval we
903          * use 5 which should be a safe default
904          */
905         if (local->hw.max_listen_interval == 0)
906                 local->hw.max_listen_interval = 5;
907
908         local->hw.conf.listen_interval = local->hw.max_listen_interval;
909
910         local->dynamic_ps_forced_timeout = -1;
911
912         result = ieee80211_wep_init(local);
913         if (result < 0)
914                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
915                             result);
916
917         rtnl_lock();
918
919         result = ieee80211_init_rate_ctrl_alg(local,
920                                               hw->rate_control_algorithm);
921         if (result < 0) {
922                 wiphy_debug(local->hw.wiphy,
923                             "Failed to initialize rate control algorithm\n");
924                 goto fail_rate;
925         }
926
927         /* add one default STA interface if supported */
928         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
929                 result = ieee80211_if_add(local, "wlan%d", NULL,
930                                           NL80211_IFTYPE_STATION, NULL);
931                 if (result)
932                         wiphy_warn(local->hw.wiphy,
933                                    "Failed to add default virtual iface\n");
934         }
935
936         rtnl_unlock();
937
938         ieee80211_led_init(local);
939
940         local->network_latency_notifier.notifier_call =
941                 ieee80211_max_network_latency;
942         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
943                                      &local->network_latency_notifier);
944         if (result) {
945                 rtnl_lock();
946                 goto fail_pm_qos;
947         }
948
949 #ifdef CONFIG_INET
950         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
951         result = register_inetaddr_notifier(&local->ifa_notifier);
952         if (result)
953                 goto fail_ifa;
954 #endif
955
956         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
957                         local->hw.napi_weight);
958
959         return 0;
960
961 #ifdef CONFIG_INET
962  fail_ifa:
963         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
964                                &local->network_latency_notifier);
965         rtnl_lock();
966 #endif
967  fail_pm_qos:
968         ieee80211_led_exit(local);
969         ieee80211_remove_interfaces(local);
970  fail_rate:
971         rtnl_unlock();
972         ieee80211_wep_free(local);
973         sta_info_stop(local);
974         destroy_workqueue(local->workqueue);
975  fail_workqueue:
976         wiphy_unregister(local->hw.wiphy);
977  fail_wiphy_register:
978         if (local->wiphy_ciphers_allocated)
979                 kfree(local->hw.wiphy->cipher_suites);
980         kfree(local->int_scan_req);
981         return result;
982 }
983 EXPORT_SYMBOL(ieee80211_register_hw);
984
985 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
986 {
987         struct ieee80211_local *local = hw_to_local(hw);
988
989         tasklet_kill(&local->tx_pending_tasklet);
990         tasklet_kill(&local->tasklet);
991
992         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
993                                &local->network_latency_notifier);
994 #ifdef CONFIG_INET
995         unregister_inetaddr_notifier(&local->ifa_notifier);
996 #endif
997
998         rtnl_lock();
999
1000         /*
1001          * At this point, interface list manipulations are fine
1002          * because the driver cannot be handing us frames any
1003          * more and the tasklet is killed.
1004          */
1005         ieee80211_remove_interfaces(local);
1006
1007         rtnl_unlock();
1008
1009         /*
1010          * Now all work items will be gone, but the
1011          * timer might still be armed, so delete it
1012          */
1013         del_timer_sync(&local->work_timer);
1014
1015         cancel_work_sync(&local->restart_work);
1016         cancel_work_sync(&local->reconfig_filter);
1017
1018         ieee80211_clear_tx_pending(local);
1019         rate_control_deinitialize(local);
1020
1021         if (skb_queue_len(&local->skb_queue) ||
1022             skb_queue_len(&local->skb_queue_unreliable))
1023                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1024         skb_queue_purge(&local->skb_queue);
1025         skb_queue_purge(&local->skb_queue_unreliable);
1026         skb_queue_purge(&local->rx_skb_queue);
1027
1028         destroy_workqueue(local->workqueue);
1029         wiphy_unregister(local->hw.wiphy);
1030         sta_info_stop(local);
1031         ieee80211_wep_free(local);
1032         ieee80211_led_exit(local);
1033         kfree(local->int_scan_req);
1034 }
1035 EXPORT_SYMBOL(ieee80211_unregister_hw);
1036
1037 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1038 {
1039         WARN_ONCE(1, "Have pending ack frames!\n");
1040         kfree_skb(p);
1041         return 0;
1042 }
1043
1044 void ieee80211_free_hw(struct ieee80211_hw *hw)
1045 {
1046         struct ieee80211_local *local = hw_to_local(hw);
1047
1048         mutex_destroy(&local->iflist_mtx);
1049         mutex_destroy(&local->mtx);
1050
1051         if (local->wiphy_ciphers_allocated)
1052                 kfree(local->hw.wiphy->cipher_suites);
1053
1054         idr_for_each(&local->ack_status_frames,
1055                      ieee80211_free_ack_frame, NULL);
1056         idr_destroy(&local->ack_status_frames);
1057
1058         wiphy_free(local->hw.wiphy);
1059 }
1060 EXPORT_SYMBOL(ieee80211_free_hw);
1061
1062 static int __init ieee80211_init(void)
1063 {
1064         struct sk_buff *skb;
1065         int ret;
1066
1067         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1068         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1069                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1070
1071         ret = rc80211_minstrel_init();
1072         if (ret)
1073                 return ret;
1074
1075         ret = rc80211_minstrel_ht_init();
1076         if (ret)
1077                 goto err_minstrel;
1078
1079         ret = rc80211_pid_init();
1080         if (ret)
1081                 goto err_pid;
1082
1083         ret = ieee80211_iface_init();
1084         if (ret)
1085                 goto err_netdev;
1086
1087         return 0;
1088  err_netdev:
1089         rc80211_pid_exit();
1090  err_pid:
1091         rc80211_minstrel_ht_exit();
1092  err_minstrel:
1093         rc80211_minstrel_exit();
1094
1095         return ret;
1096 }
1097
1098 static void __exit ieee80211_exit(void)
1099 {
1100         rc80211_pid_exit();
1101         rc80211_minstrel_ht_exit();
1102         rc80211_minstrel_exit();
1103
1104         if (mesh_allocated)
1105                 ieee80211s_stop();
1106
1107         ieee80211_iface_exit();
1108
1109         rcu_barrier();
1110 }
1111
1112
1113 subsys_initcall(ieee80211_init);
1114 module_exit(ieee80211_exit);
1115
1116 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1117 MODULE_LICENSE("GPL");