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