dddedfad5404e8700ebb675206753c9c6f438bd9
[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 || local->scanning)
51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53         if (local->fif_probe_req || local->probe_req_reg)
54                 new_flags |= FIF_PROBE_REQ;
55
56         if (local->fif_fcsfail)
57                 new_flags |= FIF_FCSFAIL;
58
59         if (local->fif_plcpfail)
60                 new_flags |= FIF_PLCPFAIL;
61
62         if (local->fif_control)
63                 new_flags |= FIF_CONTROL;
64
65         if (local->fif_other_bss)
66                 new_flags |= FIF_OTHER_BSS;
67
68         if (local->fif_pspoll)
69                 new_flags |= FIF_PSPOLL;
70
71         spin_lock_bh(&local->filter_lock);
72         changed_flags = local->filter_flags ^ new_flags;
73
74         mc = drv_prepare_multicast(local, &local->mc_list);
75         spin_unlock_bh(&local->filter_lock);
76
77         /* be a bit nasty */
78         new_flags |= (1<<31);
79
80         drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82         WARN_ON(new_flags & (1<<31));
83
84         local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89         struct ieee80211_local *local =
90                 container_of(work, struct ieee80211_local, reconfig_filter);
91
92         ieee80211_configure_filter(local);
93 }
94
95 /*
96  * Returns true if we are logically configured to be on
97  * the operating channel AND the hardware-conf is currently
98  * configured on the operating channel.  Compares channel-type
99  * as well.
100  */
101 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
102 {
103         struct ieee80211_channel *chan;
104         enum nl80211_channel_type channel_type;
105
106         /* This logic needs to match logic in ieee80211_hw_config */
107         if (local->scan_channel) {
108                 chan = local->scan_channel;
109                 /* If scanning on oper channel, use whatever channel-type
110                  * is currently in use.
111                  */
112                 if (chan == local->oper_channel)
113                         channel_type = local->_oper_channel_type;
114                 else
115                         channel_type = NL80211_CHAN_NO_HT;
116         } else if (local->tmp_channel) {
117                 chan = local->tmp_channel;
118                 channel_type = local->tmp_channel_type;
119         } else {
120                 chan = local->oper_channel;
121                 channel_type = local->_oper_channel_type;
122         }
123
124         if (chan != local->oper_channel ||
125             channel_type != local->_oper_channel_type)
126                 return false;
127
128         /* Check current hardware-config against oper_channel. */
129         if (local->oper_channel != local->hw.conf.channel ||
130             local->_oper_channel_type != local->hw.conf.channel_type)
131                 return false;
132
133         return true;
134 }
135
136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137 {
138         struct ieee80211_channel *chan;
139         int ret = 0;
140         int power;
141         enum nl80211_channel_type channel_type;
142         u32 offchannel_flag;
143
144         might_sleep();
145
146         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
147          * may need to change as well.
148          */
149         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
150         if (local->scan_channel) {
151                 chan = local->scan_channel;
152                 /* If scanning on oper channel, use whatever channel-type
153                  * is currently in use.
154                  */
155                 if (chan == local->oper_channel)
156                         channel_type = local->_oper_channel_type;
157                 else
158                         channel_type = NL80211_CHAN_NO_HT;
159         } else if (local->tmp_channel) {
160                 chan = local->tmp_channel;
161                 channel_type = local->tmp_channel_type;
162         } else {
163                 chan = local->oper_channel;
164                 channel_type = local->_oper_channel_type;
165         }
166
167         if (chan != local->oper_channel ||
168             channel_type != local->_oper_channel_type)
169                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
170         else
171                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
172
173         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
174
175         if (offchannel_flag || chan != local->hw.conf.channel ||
176             channel_type != local->hw.conf.channel_type) {
177                 local->hw.conf.channel = chan;
178                 local->hw.conf.channel_type = channel_type;
179                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
180         }
181
182         if (!conf_is_ht(&local->hw.conf)) {
183                 /*
184                  * mac80211.h documents that this is only valid
185                  * when the channel is set to an HT type, and
186                  * that otherwise STATIC is used.
187                  */
188                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
189         } else if (local->hw.conf.smps_mode != local->smps_mode) {
190                 local->hw.conf.smps_mode = local->smps_mode;
191                 changed |= IEEE80211_CONF_CHANGE_SMPS;
192         }
193
194         if ((local->scanning & SCAN_SW_SCANNING) ||
195             (local->scanning & SCAN_HW_SCANNING))
196                 power = chan->max_power;
197         else
198                 power = local->power_constr_level ?
199                         (chan->max_power - local->power_constr_level) :
200                         chan->max_power;
201
202         if (local->user_power_level >= 0)
203                 power = min(power, local->user_power_level);
204
205         if (local->hw.conf.power_level != power) {
206                 changed |= IEEE80211_CONF_CHANGE_POWER;
207                 local->hw.conf.power_level = power;
208         }
209
210         if (changed && local->open_count) {
211                 ret = drv_config(local, changed);
212                 /*
213                  * Goal:
214                  * HW reconfiguration should never fail, the driver has told
215                  * us what it can support so it should live up to that promise.
216                  *
217                  * Current status:
218                  * rfkill is not integrated with mac80211 and a
219                  * configuration command can thus fail if hardware rfkill
220                  * is enabled
221                  *
222                  * FIXME: integrate rfkill with mac80211 and then add this
223                  * WARN_ON() back
224                  *
225                  */
226                 /* WARN_ON(ret); */
227         }
228
229         return ret;
230 }
231
232 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
233                                       u32 changed)
234 {
235         struct ieee80211_local *local = sdata->local;
236         static const u8 zero[ETH_ALEN] = { 0 };
237
238         if (!changed)
239                 return;
240
241         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
242                 /*
243                  * While not associated, claim a BSSID of all-zeroes
244                  * so that drivers don't do any weird things with the
245                  * BSSID at that time.
246                  */
247                 if (sdata->vif.bss_conf.assoc)
248                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
249                 else
250                         sdata->vif.bss_conf.bssid = zero;
251         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
252                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
253         else if (sdata->vif.type == NL80211_IFTYPE_AP)
254                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
255         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
256                 sdata->vif.bss_conf.bssid = NULL;
257         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
258                 sdata->vif.bss_conf.bssid = zero;
259         } else {
260                 WARN_ON(1);
261                 return;
262         }
263
264         switch (sdata->vif.type) {
265         case NL80211_IFTYPE_AP:
266         case NL80211_IFTYPE_ADHOC:
267         case NL80211_IFTYPE_WDS:
268         case NL80211_IFTYPE_MESH_POINT:
269                 break;
270         default:
271                 /* do not warn to simplify caller in scan.c */
272                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
273                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
274                         return;
275                 break;
276         }
277
278         if (changed & BSS_CHANGED_BEACON_ENABLED) {
279                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
280                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
281                         sdata->vif.bss_conf.enable_beacon = false;
282                 } else {
283                         /*
284                          * Beacon should be enabled, but AP mode must
285                          * check whether there is a beacon configured.
286                          */
287                         switch (sdata->vif.type) {
288                         case NL80211_IFTYPE_AP:
289                                 sdata->vif.bss_conf.enable_beacon =
290                                         !!sdata->u.ap.beacon;
291                                 break;
292                         case NL80211_IFTYPE_ADHOC:
293                                 sdata->vif.bss_conf.enable_beacon =
294                                         !!sdata->u.ibss.presp;
295                                 break;
296 #ifdef CONFIG_MAC80211_MESH
297                         case NL80211_IFTYPE_MESH_POINT:
298                                 sdata->vif.bss_conf.enable_beacon =
299                                         !!sdata->u.mesh.mesh_id_len;
300                                 break;
301 #endif
302                         default:
303                                 /* not reached */
304                                 WARN_ON(1);
305                                 break;
306                         }
307                 }
308         }
309
310         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
311 }
312
313 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
314 {
315         sdata->vif.bss_conf.use_cts_prot = false;
316         sdata->vif.bss_conf.use_short_preamble = false;
317         sdata->vif.bss_conf.use_short_slot = false;
318         return BSS_CHANGED_ERP_CTS_PROT |
319                BSS_CHANGED_ERP_PREAMBLE |
320                BSS_CHANGED_ERP_SLOT;
321 }
322
323 static void ieee80211_tasklet_handler(unsigned long data)
324 {
325         struct ieee80211_local *local = (struct ieee80211_local *) data;
326         struct sta_info *sta, *tmp;
327         struct skb_eosp_msg_data *eosp_data;
328         struct sk_buff *skb;
329
330         while ((skb = skb_dequeue(&local->skb_queue)) ||
331                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332                 switch (skb->pkt_type) {
333                 case IEEE80211_RX_MSG:
334                         /* Clear skb->pkt_type in order to not confuse kernel
335                          * netstack. */
336                         skb->pkt_type = 0;
337                         ieee80211_rx(local_to_hw(local), skb);
338                         break;
339                 case IEEE80211_TX_STATUS_MSG:
340                         skb->pkt_type = 0;
341                         ieee80211_tx_status(local_to_hw(local), skb);
342                         break;
343                 case IEEE80211_EOSP_MSG:
344                         eosp_data = (void *)skb->cb;
345                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
346                                 /* skip wrong virtual interface */
347                                 if (memcmp(eosp_data->iface,
348                                            sta->sdata->vif.addr, ETH_ALEN))
349                                         continue;
350                                 clear_sta_flag(sta, WLAN_STA_SP);
351                                 break;
352                         }
353                         dev_kfree_skb(skb);
354                         break;
355                 default:
356                         WARN(1, "mac80211: Packet is of unknown type %d\n",
357                              skb->pkt_type);
358                         dev_kfree_skb(skb);
359                         break;
360                 }
361         }
362 }
363
364 static void ieee80211_restart_work(struct work_struct *work)
365 {
366         struct ieee80211_local *local =
367                 container_of(work, struct ieee80211_local, restart_work);
368
369         /* wait for scan work complete */
370         flush_workqueue(local->workqueue);
371
372         mutex_lock(&local->mtx);
373         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
374              local->sched_scanning,
375                 "%s called with hardware scan in progress\n", __func__);
376         mutex_unlock(&local->mtx);
377
378         rtnl_lock();
379         ieee80211_scan_cancel(local);
380         ieee80211_reconfig(local);
381         rtnl_unlock();
382 }
383
384 void ieee80211_restart_hw(struct ieee80211_hw *hw)
385 {
386         struct ieee80211_local *local = hw_to_local(hw);
387
388         trace_api_restart_hw(local);
389
390         wiphy_info(hw->wiphy,
391                    "Hardware restart was requested\n");
392
393         /* use this reason, ieee80211_reconfig will unblock it */
394         ieee80211_stop_queues_by_reason(hw,
395                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
396
397         schedule_work(&local->restart_work);
398 }
399 EXPORT_SYMBOL(ieee80211_restart_hw);
400
401 static void ieee80211_recalc_smps_work(struct work_struct *work)
402 {
403         struct ieee80211_local *local =
404                 container_of(work, struct ieee80211_local, recalc_smps);
405
406         mutex_lock(&local->iflist_mtx);
407         ieee80211_recalc_smps(local);
408         mutex_unlock(&local->iflist_mtx);
409 }
410
411 #ifdef CONFIG_INET
412 static int ieee80211_ifa_changed(struct notifier_block *nb,
413                                  unsigned long data, void *arg)
414 {
415         struct in_ifaddr *ifa = arg;
416         struct ieee80211_local *local =
417                 container_of(nb, struct ieee80211_local,
418                              ifa_notifier);
419         struct net_device *ndev = ifa->ifa_dev->dev;
420         struct wireless_dev *wdev = ndev->ieee80211_ptr;
421         struct in_device *idev;
422         struct ieee80211_sub_if_data *sdata;
423         struct ieee80211_bss_conf *bss_conf;
424         struct ieee80211_if_managed *ifmgd;
425         int c = 0;
426
427         /* Make sure it's our interface that got changed */
428         if (!wdev)
429                 return NOTIFY_DONE;
430
431         if (wdev->wiphy != local->hw.wiphy)
432                 return NOTIFY_DONE;
433
434         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
435         bss_conf = &sdata->vif.bss_conf;
436
437         if (!ieee80211_sdata_running(sdata))
438                 return NOTIFY_DONE;
439
440         /* ARP filtering is only supported in managed mode */
441         if (sdata->vif.type != NL80211_IFTYPE_STATION)
442                 return NOTIFY_DONE;
443
444         idev = __in_dev_get_rtnl(sdata->dev);
445         if (!idev)
446                 return NOTIFY_DONE;
447
448         ifmgd = &sdata->u.mgd;
449         mutex_lock(&ifmgd->mtx);
450
451         /* Copy the addresses to the bss_conf list */
452         ifa = idev->ifa_list;
453         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
454                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
455                 ifa = ifa->ifa_next;
456                 c++;
457         }
458
459         /* If not all addresses fit the list, disable filtering */
460         if (ifa) {
461                 sdata->arp_filter_state = false;
462                 c = 0;
463         } else {
464                 sdata->arp_filter_state = true;
465         }
466         bss_conf->arp_addr_cnt = c;
467
468         /* Configure driver only if associated */
469         if (ifmgd->associated) {
470                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
471                 ieee80211_bss_info_change_notify(sdata,
472                                                  BSS_CHANGED_ARP_FILTER);
473         }
474
475         mutex_unlock(&ifmgd->mtx);
476
477         return NOTIFY_DONE;
478 }
479 #endif
480
481 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
482 {
483         struct ieee80211_local *local =
484                 container_of(napi, struct ieee80211_local, napi);
485
486         return local->ops->napi_poll(&local->hw, budget);
487 }
488
489 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
490 {
491         struct ieee80211_local *local = hw_to_local(hw);
492
493         napi_schedule(&local->napi);
494 }
495 EXPORT_SYMBOL(ieee80211_napi_schedule);
496
497 void ieee80211_napi_complete(struct ieee80211_hw *hw)
498 {
499         struct ieee80211_local *local = hw_to_local(hw);
500
501         napi_complete(&local->napi);
502 }
503 EXPORT_SYMBOL(ieee80211_napi_complete);
504
505 /* There isn't a lot of sense in it, but you can transmit anything you like */
506 static const struct ieee80211_txrx_stypes
507 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
508         [NL80211_IFTYPE_ADHOC] = {
509                 .tx = 0xffff,
510                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
511         },
512         [NL80211_IFTYPE_STATION] = {
513                 .tx = 0xffff,
514                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
515                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
516         },
517         [NL80211_IFTYPE_AP] = {
518                 .tx = 0xffff,
519                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
520                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
521                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
522                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
523                         BIT(IEEE80211_STYPE_AUTH >> 4) |
524                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
525                         BIT(IEEE80211_STYPE_ACTION >> 4),
526         },
527         [NL80211_IFTYPE_AP_VLAN] = {
528                 /* copy AP */
529                 .tx = 0xffff,
530                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
531                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
532                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
533                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
534                         BIT(IEEE80211_STYPE_AUTH >> 4) |
535                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
536                         BIT(IEEE80211_STYPE_ACTION >> 4),
537         },
538         [NL80211_IFTYPE_P2P_CLIENT] = {
539                 .tx = 0xffff,
540                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
541                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
542         },
543         [NL80211_IFTYPE_P2P_GO] = {
544                 .tx = 0xffff,
545                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
546                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
547                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
548                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
549                         BIT(IEEE80211_STYPE_AUTH >> 4) |
550                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
551                         BIT(IEEE80211_STYPE_ACTION >> 4),
552         },
553         [NL80211_IFTYPE_MESH_POINT] = {
554                 .tx = 0xffff,
555                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
556                         BIT(IEEE80211_STYPE_AUTH >> 4) |
557                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
558         },
559 };
560
561 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
562         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
563                              IEEE80211_HT_AMPDU_PARM_DENSITY,
564
565         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
566                                 IEEE80211_HT_CAP_MAX_AMSDU |
567                                 IEEE80211_HT_CAP_SGI_40),
568         .mcs = {
569                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
570                              0xff, 0xff, 0xff, 0xff, 0xff, },
571         },
572 };
573
574 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
575                                         const struct ieee80211_ops *ops)
576 {
577         struct ieee80211_local *local;
578         int priv_size, i;
579         struct wiphy *wiphy;
580
581         /* Ensure 32-byte alignment of our private data and hw private data.
582          * We use the wiphy priv data for both our ieee80211_local and for
583          * the driver's private data
584          *
585          * In memory it'll be like this:
586          *
587          * +-------------------------+
588          * | struct wiphy           |
589          * +-------------------------+
590          * | struct ieee80211_local  |
591          * +-------------------------+
592          * | driver's private data   |
593          * +-------------------------+
594          *
595          */
596         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
597
598         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
599
600         if (!wiphy)
601                 return NULL;
602
603         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
604
605         wiphy->privid = mac80211_wiphy_privid;
606
607         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
608                         WIPHY_FLAG_4ADDR_AP |
609                         WIPHY_FLAG_4ADDR_STATION |
610                         WIPHY_FLAG_REPORTS_OBSS |
611                         WIPHY_FLAG_OFFCHAN_TX |
612                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
613
614         wiphy->features = NL80211_FEATURE_SK_TX_STATUS;
615
616         if (!ops->set_key)
617                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
618
619         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
620
621         local = wiphy_priv(wiphy);
622
623         local->hw.wiphy = wiphy;
624
625         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
626
627         BUG_ON(!ops->tx && !ops->tx_frags);
628         BUG_ON(!ops->start);
629         BUG_ON(!ops->stop);
630         BUG_ON(!ops->config);
631         BUG_ON(!ops->add_interface);
632         BUG_ON(!ops->remove_interface);
633         BUG_ON(!ops->configure_filter);
634         local->ops = ops;
635
636         /* set up some defaults */
637         local->hw.queues = 1;
638         local->hw.max_rates = 1;
639         local->hw.max_report_rates = 0;
640         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
641         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
642         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
643         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
644         local->user_power_level = -1;
645         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
646         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
647         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
648
649         INIT_LIST_HEAD(&local->interfaces);
650
651         __hw_addr_init(&local->mc_list);
652
653         mutex_init(&local->iflist_mtx);
654         mutex_init(&local->mtx);
655
656         mutex_init(&local->key_mtx);
657         spin_lock_init(&local->filter_lock);
658         spin_lock_init(&local->queue_stop_reason_lock);
659
660         /*
661          * The rx_skb_queue is only accessed from tasklets,
662          * but other SKB queues are used from within IRQ
663          * context. Therefore, this one needs a different
664          * locking class so our direct, non-irq-safe use of
665          * the queue's lock doesn't throw lockdep warnings.
666          */
667         skb_queue_head_init_class(&local->rx_skb_queue,
668                                   &ieee80211_rx_skb_queue_class);
669
670         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
671
672         ieee80211_work_init(local);
673
674         INIT_WORK(&local->restart_work, ieee80211_restart_work);
675
676         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
677         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
678         local->smps_mode = IEEE80211_SMPS_OFF;
679
680         INIT_WORK(&local->dynamic_ps_enable_work,
681                   ieee80211_dynamic_ps_enable_work);
682         INIT_WORK(&local->dynamic_ps_disable_work,
683                   ieee80211_dynamic_ps_disable_work);
684         setup_timer(&local->dynamic_ps_timer,
685                     ieee80211_dynamic_ps_timer, (unsigned long) local);
686
687         INIT_WORK(&local->sched_scan_stopped_work,
688                   ieee80211_sched_scan_stopped_work);
689
690         spin_lock_init(&local->ack_status_lock);
691         idr_init(&local->ack_status_frames);
692         /* preallocate at least one entry */
693         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
694
695         sta_info_init(local);
696
697         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
698                 skb_queue_head_init(&local->pending[i]);
699                 atomic_set(&local->agg_queue_stop[i], 0);
700         }
701         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
702                      (unsigned long)local);
703
704         tasklet_init(&local->tasklet,
705                      ieee80211_tasklet_handler,
706                      (unsigned long) local);
707
708         skb_queue_head_init(&local->skb_queue);
709         skb_queue_head_init(&local->skb_queue_unreliable);
710
711         /* init dummy netdev for use w/ NAPI */
712         init_dummy_netdev(&local->napi_dev);
713
714         ieee80211_led_names(local);
715
716         ieee80211_hw_roc_setup(local);
717
718         return local_to_hw(local);
719 }
720 EXPORT_SYMBOL(ieee80211_alloc_hw);
721
722 int ieee80211_register_hw(struct ieee80211_hw *hw)
723 {
724         struct ieee80211_local *local = hw_to_local(hw);
725         int result, i;
726         enum ieee80211_band band;
727         int channels, max_bitrates;
728         bool supp_ht;
729         static const u32 cipher_suites[] = {
730                 /* keep WEP first, it may be removed below */
731                 WLAN_CIPHER_SUITE_WEP40,
732                 WLAN_CIPHER_SUITE_WEP104,
733                 WLAN_CIPHER_SUITE_TKIP,
734                 WLAN_CIPHER_SUITE_CCMP,
735
736                 /* keep last -- depends on hw flags! */
737                 WLAN_CIPHER_SUITE_AES_CMAC
738         };
739
740         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
741 #ifdef CONFIG_PM
742             && (!local->ops->suspend || !local->ops->resume)
743 #endif
744             )
745                 return -EINVAL;
746
747         if (hw->max_report_rates == 0)
748                 hw->max_report_rates = hw->max_rates;
749
750         /*
751          * generic code guarantees at least one band,
752          * set this very early because much code assumes
753          * that hw.conf.channel is assigned
754          */
755         channels = 0;
756         max_bitrates = 0;
757         supp_ht = false;
758         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
759                 struct ieee80211_supported_band *sband;
760
761                 sband = local->hw.wiphy->bands[band];
762                 if (!sband)
763                         continue;
764                 if (!local->oper_channel) {
765                         /* init channel we're on */
766                         local->hw.conf.channel =
767                         local->oper_channel = &sband->channels[0];
768                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
769                 }
770                 channels += sband->n_channels;
771
772                 if (max_bitrates < sband->n_bitrates)
773                         max_bitrates = sband->n_bitrates;
774                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
775         }
776
777         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
778                                       sizeof(void *) * channels, GFP_KERNEL);
779         if (!local->int_scan_req)
780                 return -ENOMEM;
781
782         /* if low-level driver supports AP, we also support VLAN */
783         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
784                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
785                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
786         }
787
788         /* mac80211 always supports monitor */
789         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
790         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
791
792         /*
793          * mac80211 doesn't support more than 1 channel, and also not more
794          * than one IBSS interface
795          */
796         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
797                 const struct ieee80211_iface_combination *c;
798                 int j;
799
800                 c = &hw->wiphy->iface_combinations[i];
801
802                 if (c->num_different_channels > 1)
803                         return -EINVAL;
804
805                 for (j = 0; j < c->n_limits; j++)
806                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
807                             c->limits[j].max > 1)
808                                 return -EINVAL;
809         }
810
811 #ifndef CONFIG_MAC80211_MESH
812         /* mesh depends on Kconfig, but drivers should set it if they want */
813         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
814 #endif
815
816         /* if the underlying driver supports mesh, mac80211 will (at least)
817          * provide routing of mesh authentication frames to userspace */
818         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
819                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
820
821         /* mac80211 supports control port protocol changing */
822         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
823
824         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
825                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
826         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
827                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
828
829         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
830              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
831              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
832
833         /*
834          * Calculate scan IE length -- we need this to alloc
835          * memory and to subtract from the driver limit. It
836          * includes the DS Params, (extended) supported rates, and HT
837          * information -- SSID is the driver's responsibility.
838          */
839         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
840                 3 /* DS Params */;
841         if (supp_ht)
842                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
843
844         if (!local->ops->hw_scan) {
845                 /* For hw_scan, driver needs to set these up. */
846                 local->hw.wiphy->max_scan_ssids = 4;
847                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
848         }
849
850         /*
851          * If the driver supports any scan IEs, then assume the
852          * limit includes the IEs mac80211 will add, otherwise
853          * leave it at zero and let the driver sort it out; we
854          * still pass our IEs to the driver but userspace will
855          * not be allowed to in that case.
856          */
857         if (local->hw.wiphy->max_scan_ie_len)
858                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
859
860         /* Set up cipher suites unless driver already did */
861         if (!local->hw.wiphy->cipher_suites) {
862                 local->hw.wiphy->cipher_suites = cipher_suites;
863                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
864                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
865                         local->hw.wiphy->n_cipher_suites--;
866         }
867         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
868                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
869                         local->hw.wiphy->cipher_suites += 2;
870                         local->hw.wiphy->n_cipher_suites -= 2;
871                 } else {
872                         u32 *suites;
873                         int r, w = 0;
874
875                         /* Filter out WEP */
876
877                         suites = kmemdup(
878                                 local->hw.wiphy->cipher_suites,
879                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
880                                 GFP_KERNEL);
881                         if (!suites)
882                                 return -ENOMEM;
883                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
884                                 u32 suite = local->hw.wiphy->cipher_suites[r];
885                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
886                                     suite == WLAN_CIPHER_SUITE_WEP104)
887                                         continue;
888                                 suites[w++] = suite;
889                         }
890                         local->hw.wiphy->cipher_suites = suites;
891                         local->hw.wiphy->n_cipher_suites = w;
892                         local->wiphy_ciphers_allocated = true;
893                 }
894         }
895
896         if (!local->ops->remain_on_channel)
897                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
898
899         if (local->ops->sched_scan_start)
900                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
901
902         /* mac80211 based drivers don't support internal TDLS setup */
903         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
904                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
905
906         result = wiphy_register(local->hw.wiphy);
907         if (result < 0)
908                 goto fail_wiphy_register;
909
910         /*
911          * We use the number of queues for feature tests (QoS, HT) internally
912          * so restrict them appropriately.
913          */
914         if (hw->queues > IEEE80211_MAX_QUEUES)
915                 hw->queues = IEEE80211_MAX_QUEUES;
916
917         local->workqueue =
918                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
919         if (!local->workqueue) {
920                 result = -ENOMEM;
921                 goto fail_workqueue;
922         }
923
924         /*
925          * The hardware needs headroom for sending the frame,
926          * and we need some headroom for passing the frame to monitor
927          * interfaces, but never both at the same time.
928          */
929         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
930                                    IEEE80211_TX_STATUS_HEADROOM);
931
932         debugfs_hw_add(local);
933
934         /*
935          * if the driver doesn't specify a max listen interval we
936          * use 5 which should be a safe default
937          */
938         if (local->hw.max_listen_interval == 0)
939                 local->hw.max_listen_interval = 5;
940
941         local->hw.conf.listen_interval = local->hw.max_listen_interval;
942
943         local->dynamic_ps_forced_timeout = -1;
944
945         result = ieee80211_wep_init(local);
946         if (result < 0)
947                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
948                             result);
949
950         rtnl_lock();
951
952         result = ieee80211_init_rate_ctrl_alg(local,
953                                               hw->rate_control_algorithm);
954         if (result < 0) {
955                 wiphy_debug(local->hw.wiphy,
956                             "Failed to initialize rate control algorithm\n");
957                 goto fail_rate;
958         }
959
960         /* add one default STA interface if supported */
961         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
962                 result = ieee80211_if_add(local, "wlan%d", NULL,
963                                           NL80211_IFTYPE_STATION, NULL);
964                 if (result)
965                         wiphy_warn(local->hw.wiphy,
966                                    "Failed to add default virtual iface\n");
967         }
968
969         rtnl_unlock();
970
971         ieee80211_led_init(local);
972
973         local->network_latency_notifier.notifier_call =
974                 ieee80211_max_network_latency;
975         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
976                                      &local->network_latency_notifier);
977         if (result) {
978                 rtnl_lock();
979                 goto fail_pm_qos;
980         }
981
982 #ifdef CONFIG_INET
983         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
984         result = register_inetaddr_notifier(&local->ifa_notifier);
985         if (result)
986                 goto fail_ifa;
987 #endif
988
989         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
990                         local->hw.napi_weight);
991
992         return 0;
993
994 #ifdef CONFIG_INET
995  fail_ifa:
996         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
997                                &local->network_latency_notifier);
998         rtnl_lock();
999 #endif
1000  fail_pm_qos:
1001         ieee80211_led_exit(local);
1002         ieee80211_remove_interfaces(local);
1003  fail_rate:
1004         rtnl_unlock();
1005         ieee80211_wep_free(local);
1006         sta_info_stop(local);
1007         destroy_workqueue(local->workqueue);
1008  fail_workqueue:
1009         wiphy_unregister(local->hw.wiphy);
1010  fail_wiphy_register:
1011         if (local->wiphy_ciphers_allocated)
1012                 kfree(local->hw.wiphy->cipher_suites);
1013         kfree(local->int_scan_req);
1014         return result;
1015 }
1016 EXPORT_SYMBOL(ieee80211_register_hw);
1017
1018 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1019 {
1020         struct ieee80211_local *local = hw_to_local(hw);
1021
1022         tasklet_kill(&local->tx_pending_tasklet);
1023         tasklet_kill(&local->tasklet);
1024
1025         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1026                                &local->network_latency_notifier);
1027 #ifdef CONFIG_INET
1028         unregister_inetaddr_notifier(&local->ifa_notifier);
1029 #endif
1030
1031         rtnl_lock();
1032
1033         /*
1034          * At this point, interface list manipulations are fine
1035          * because the driver cannot be handing us frames any
1036          * more and the tasklet is killed.
1037          */
1038         ieee80211_remove_interfaces(local);
1039
1040         rtnl_unlock();
1041
1042         /*
1043          * Now all work items will be gone, but the
1044          * timer might still be armed, so delete it
1045          */
1046         del_timer_sync(&local->work_timer);
1047
1048         cancel_work_sync(&local->restart_work);
1049         cancel_work_sync(&local->reconfig_filter);
1050
1051         ieee80211_clear_tx_pending(local);
1052         rate_control_deinitialize(local);
1053
1054         if (skb_queue_len(&local->skb_queue) ||
1055             skb_queue_len(&local->skb_queue_unreliable))
1056                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1057         skb_queue_purge(&local->skb_queue);
1058         skb_queue_purge(&local->skb_queue_unreliable);
1059         skb_queue_purge(&local->rx_skb_queue);
1060
1061         destroy_workqueue(local->workqueue);
1062         wiphy_unregister(local->hw.wiphy);
1063         sta_info_stop(local);
1064         ieee80211_wep_free(local);
1065         ieee80211_led_exit(local);
1066         kfree(local->int_scan_req);
1067 }
1068 EXPORT_SYMBOL(ieee80211_unregister_hw);
1069
1070 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1071 {
1072         WARN_ONCE(1, "Have pending ack frames!\n");
1073         kfree_skb(p);
1074         return 0;
1075 }
1076
1077 void ieee80211_free_hw(struct ieee80211_hw *hw)
1078 {
1079         struct ieee80211_local *local = hw_to_local(hw);
1080
1081         mutex_destroy(&local->iflist_mtx);
1082         mutex_destroy(&local->mtx);
1083
1084         if (local->wiphy_ciphers_allocated)
1085                 kfree(local->hw.wiphy->cipher_suites);
1086
1087         idr_for_each(&local->ack_status_frames,
1088                      ieee80211_free_ack_frame, NULL);
1089         idr_destroy(&local->ack_status_frames);
1090
1091         wiphy_free(local->hw.wiphy);
1092 }
1093 EXPORT_SYMBOL(ieee80211_free_hw);
1094
1095 static int __init ieee80211_init(void)
1096 {
1097         struct sk_buff *skb;
1098         int ret;
1099
1100         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1101         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1102                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1103
1104         ret = rc80211_minstrel_init();
1105         if (ret)
1106                 return ret;
1107
1108         ret = rc80211_minstrel_ht_init();
1109         if (ret)
1110                 goto err_minstrel;
1111
1112         ret = rc80211_pid_init();
1113         if (ret)
1114                 goto err_pid;
1115
1116         ret = ieee80211_iface_init();
1117         if (ret)
1118                 goto err_netdev;
1119
1120         return 0;
1121  err_netdev:
1122         rc80211_pid_exit();
1123  err_pid:
1124         rc80211_minstrel_ht_exit();
1125  err_minstrel:
1126         rc80211_minstrel_exit();
1127
1128         return ret;
1129 }
1130
1131 static void __exit ieee80211_exit(void)
1132 {
1133         rc80211_pid_exit();
1134         rc80211_minstrel_ht_exit();
1135         rc80211_minstrel_exit();
1136
1137         if (mesh_allocated)
1138                 ieee80211s_stop();
1139
1140         ieee80211_iface_exit();
1141
1142         rcu_barrier();
1143 }
1144
1145
1146 subsys_initcall(ieee80211_init);
1147 module_exit(ieee80211_exit);
1148
1149 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1150 MODULE_LICENSE("GPL");