Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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_params.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
37 bool ieee80211_disable_40mhz_24ghz;
38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40                  "Disable 40MHz support in the 2.4GHz band");
41
42 void ieee80211_configure_filter(struct ieee80211_local *local)
43 {
44         u64 mc;
45         unsigned int changed_flags;
46         unsigned int new_flags = 0;
47
48         if (atomic_read(&local->iff_promiscs))
49                 new_flags |= FIF_PROMISC_IN_BSS;
50
51         if (atomic_read(&local->iff_allmultis))
52                 new_flags |= FIF_ALLMULTI;
53
54         if (local->monitors || local->scanning)
55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
56
57         if (local->fif_fcsfail)
58                 new_flags |= FIF_FCSFAIL;
59
60         if (local->fif_plcpfail)
61                 new_flags |= FIF_PLCPFAIL;
62
63         if (local->fif_control)
64                 new_flags |= FIF_CONTROL;
65
66         if (local->fif_other_bss)
67                 new_flags |= FIF_OTHER_BSS;
68
69         if (local->fif_pspoll)
70                 new_flags |= FIF_PSPOLL;
71
72         spin_lock_bh(&local->filter_lock);
73         changed_flags = local->filter_flags ^ new_flags;
74
75         mc = drv_prepare_multicast(local, &local->mc_list);
76         spin_unlock_bh(&local->filter_lock);
77
78         /* be a bit nasty */
79         new_flags |= (1<<31);
80
81         drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83         WARN_ON(new_flags & (1<<31));
84
85         local->filter_flags = new_flags & ~(1<<31);
86 }
87
88 static void ieee80211_reconfig_filter(struct work_struct *work)
89 {
90         struct ieee80211_local *local =
91                 container_of(work, struct ieee80211_local, reconfig_filter);
92
93         ieee80211_configure_filter(local);
94 }
95
96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97 {
98         struct ieee80211_channel *chan, *scan_chan;
99         int ret = 0;
100         int power;
101         enum nl80211_channel_type channel_type;
102         u32 offchannel_flag;
103
104         might_sleep();
105
106         scan_chan = local->scan_channel;
107
108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109         if (scan_chan) {
110                 chan = scan_chan;
111                 channel_type = NL80211_CHAN_NO_HT;
112                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
113         } else if (local->tmp_channel) {
114                 chan = scan_chan = local->tmp_channel;
115                 channel_type = local->tmp_channel_type;
116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
117         } else {
118                 chan = local->oper_channel;
119                 channel_type = local->_oper_channel_type;
120                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
121         }
122         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
123
124         if (offchannel_flag || chan != local->hw.conf.channel ||
125             channel_type != local->hw.conf.channel_type) {
126                 local->hw.conf.channel = chan;
127                 local->hw.conf.channel_type = channel_type;
128                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
129         }
130
131         if (!conf_is_ht(&local->hw.conf)) {
132                 /*
133                  * mac80211.h documents that this is only valid
134                  * when the channel is set to an HT type, and
135                  * that otherwise STATIC is used.
136                  */
137                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
138         } else if (local->hw.conf.smps_mode != local->smps_mode) {
139                 local->hw.conf.smps_mode = local->smps_mode;
140                 changed |= IEEE80211_CONF_CHANGE_SMPS;
141         }
142
143         if (scan_chan)
144                 power = chan->max_power;
145         else
146                 power = local->power_constr_level ?
147                         (chan->max_power - local->power_constr_level) :
148                         chan->max_power;
149
150         if (local->user_power_level >= 0)
151                 power = min(power, local->user_power_level);
152
153         if (local->hw.conf.power_level != power) {
154                 changed |= IEEE80211_CONF_CHANGE_POWER;
155                 local->hw.conf.power_level = power;
156         }
157
158         if (changed && local->open_count) {
159                 ret = drv_config(local, changed);
160                 /*
161                  * Goal:
162                  * HW reconfiguration should never fail, the driver has told
163                  * us what it can support so it should live up to that promise.
164                  *
165                  * Current status:
166                  * rfkill is not integrated with mac80211 and a
167                  * configuration command can thus fail if hardware rfkill
168                  * is enabled
169                  *
170                  * FIXME: integrate rfkill with mac80211 and then add this
171                  * WARN_ON() back
172                  *
173                  */
174                 /* WARN_ON(ret); */
175         }
176
177         return ret;
178 }
179
180 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
181                                       u32 changed)
182 {
183         struct ieee80211_local *local = sdata->local;
184         static const u8 zero[ETH_ALEN] = { 0 };
185
186         if (!changed)
187                 return;
188
189         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
190                 /*
191                  * While not associated, claim a BSSID of all-zeroes
192                  * so that drivers don't do any weird things with the
193                  * BSSID at that time.
194                  */
195                 if (sdata->vif.bss_conf.assoc)
196                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
197                 else
198                         sdata->vif.bss_conf.bssid = zero;
199         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
200                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
201         else if (sdata->vif.type == NL80211_IFTYPE_AP)
202                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
203         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
204                 sdata->vif.bss_conf.bssid = zero;
205         } else {
206                 WARN_ON(1);
207                 return;
208         }
209
210         switch (sdata->vif.type) {
211         case NL80211_IFTYPE_AP:
212         case NL80211_IFTYPE_ADHOC:
213         case NL80211_IFTYPE_MESH_POINT:
214                 break;
215         default:
216                 /* do not warn to simplify caller in scan.c */
217                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
218                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
219                         return;
220                 break;
221         }
222
223         if (changed & BSS_CHANGED_BEACON_ENABLED) {
224                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
225                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
226                         sdata->vif.bss_conf.enable_beacon = false;
227                 } else {
228                         /*
229                          * Beacon should be enabled, but AP mode must
230                          * check whether there is a beacon configured.
231                          */
232                         switch (sdata->vif.type) {
233                         case NL80211_IFTYPE_AP:
234                                 sdata->vif.bss_conf.enable_beacon =
235                                         !!sdata->u.ap.beacon;
236                                 break;
237                         case NL80211_IFTYPE_ADHOC:
238                                 sdata->vif.bss_conf.enable_beacon =
239                                         !!sdata->u.ibss.presp;
240                                 break;
241                         case NL80211_IFTYPE_MESH_POINT:
242                                 sdata->vif.bss_conf.enable_beacon = true;
243                                 break;
244                         default:
245                                 /* not reached */
246                                 WARN_ON(1);
247                                 break;
248                         }
249                 }
250         }
251
252         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
253 }
254
255 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
256 {
257         sdata->vif.bss_conf.use_cts_prot = false;
258         sdata->vif.bss_conf.use_short_preamble = false;
259         sdata->vif.bss_conf.use_short_slot = false;
260         return BSS_CHANGED_ERP_CTS_PROT |
261                BSS_CHANGED_ERP_PREAMBLE |
262                BSS_CHANGED_ERP_SLOT;
263 }
264
265 static void ieee80211_tasklet_handler(unsigned long data)
266 {
267         struct ieee80211_local *local = (struct ieee80211_local *) data;
268         struct sk_buff *skb;
269
270         while ((skb = skb_dequeue(&local->skb_queue)) ||
271                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
272                 switch (skb->pkt_type) {
273                 case IEEE80211_RX_MSG:
274                         /* Clear skb->pkt_type in order to not confuse kernel
275                          * netstack. */
276                         skb->pkt_type = 0;
277                         ieee80211_rx(local_to_hw(local), skb);
278                         break;
279                 case IEEE80211_TX_STATUS_MSG:
280                         skb->pkt_type = 0;
281                         ieee80211_tx_status(local_to_hw(local), skb);
282                         break;
283                 default:
284                         WARN(1, "mac80211: Packet is of unknown type %d\n",
285                              skb->pkt_type);
286                         dev_kfree_skb(skb);
287                         break;
288                 }
289         }
290 }
291
292 static void ieee80211_restart_work(struct work_struct *work)
293 {
294         struct ieee80211_local *local =
295                 container_of(work, struct ieee80211_local, restart_work);
296
297         rtnl_lock();
298         ieee80211_reconfig(local);
299         rtnl_unlock();
300 }
301
302 void ieee80211_restart_hw(struct ieee80211_hw *hw)
303 {
304         struct ieee80211_local *local = hw_to_local(hw);
305
306         trace_api_restart_hw(local);
307
308         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
309                 "%s called with hardware scan in progress\n", __func__);
310
311         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)))
312                 ieee80211_scan_cancel(local);
313
314         /* use this reason, ieee80211_reconfig will unblock it */
315         ieee80211_stop_queues_by_reason(hw,
316                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
317
318         schedule_work(&local->restart_work);
319 }
320 EXPORT_SYMBOL(ieee80211_restart_hw);
321
322 static void ieee80211_recalc_smps_work(struct work_struct *work)
323 {
324         struct ieee80211_local *local =
325                 container_of(work, struct ieee80211_local, recalc_smps);
326
327         mutex_lock(&local->iflist_mtx);
328         ieee80211_recalc_smps(local, NULL);
329         mutex_unlock(&local->iflist_mtx);
330 }
331
332 #ifdef CONFIG_INET
333 static int ieee80211_ifa_changed(struct notifier_block *nb,
334                                  unsigned long data, void *arg)
335 {
336         struct in_ifaddr *ifa = arg;
337         struct ieee80211_local *local =
338                 container_of(nb, struct ieee80211_local,
339                              ifa_notifier);
340         struct net_device *ndev = ifa->ifa_dev->dev;
341         struct wireless_dev *wdev = ndev->ieee80211_ptr;
342         struct in_device *idev;
343         struct ieee80211_sub_if_data *sdata;
344         struct ieee80211_bss_conf *bss_conf;
345         struct ieee80211_if_managed *ifmgd;
346         int c = 0;
347
348         /* Make sure it's our interface that got changed */
349         if (!wdev)
350                 return NOTIFY_DONE;
351
352         if (wdev->wiphy != local->hw.wiphy)
353                 return NOTIFY_DONE;
354
355         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
356         bss_conf = &sdata->vif.bss_conf;
357
358         if (!ieee80211_sdata_running(sdata))
359                 return NOTIFY_DONE;
360
361         /* ARP filtering is only supported in managed mode */
362         if (sdata->vif.type != NL80211_IFTYPE_STATION)
363                 return NOTIFY_DONE;
364
365         idev = sdata->dev->ip_ptr;
366         if (!idev)
367                 return NOTIFY_DONE;
368
369         ifmgd = &sdata->u.mgd;
370         mutex_lock(&ifmgd->mtx);
371
372         /* Copy the addresses to the bss_conf list */
373         ifa = idev->ifa_list;
374         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
375                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
376                 ifa = ifa->ifa_next;
377                 c++;
378         }
379
380         /* If not all addresses fit the list, disable filtering */
381         if (ifa) {
382                 sdata->arp_filter_state = false;
383                 c = 0;
384         } else {
385                 sdata->arp_filter_state = true;
386         }
387         bss_conf->arp_addr_cnt = c;
388
389         /* Configure driver only if associated */
390         if (ifmgd->associated) {
391                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
392                 ieee80211_bss_info_change_notify(sdata,
393                                                  BSS_CHANGED_ARP_FILTER);
394         }
395
396         mutex_unlock(&ifmgd->mtx);
397
398         return NOTIFY_DONE;
399 }
400 #endif
401
402 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
403 {
404         struct ieee80211_local *local =
405                 container_of(napi, struct ieee80211_local, napi);
406
407         return local->ops->napi_poll(&local->hw, budget);
408 }
409
410 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
411 {
412         struct ieee80211_local *local = hw_to_local(hw);
413
414         napi_schedule(&local->napi);
415 }
416 EXPORT_SYMBOL(ieee80211_napi_schedule);
417
418 void ieee80211_napi_complete(struct ieee80211_hw *hw)
419 {
420         struct ieee80211_local *local = hw_to_local(hw);
421
422         napi_complete(&local->napi);
423 }
424 EXPORT_SYMBOL(ieee80211_napi_complete);
425
426 /* There isn't a lot of sense in it, but you can transmit anything you like */
427 static const struct ieee80211_txrx_stypes
428 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
429         [NL80211_IFTYPE_ADHOC] = {
430                 .tx = 0xffff,
431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
432         },
433         [NL80211_IFTYPE_STATION] = {
434                 .tx = 0xffff,
435                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
436                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
437         },
438         [NL80211_IFTYPE_AP] = {
439                 .tx = 0xffff,
440                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
441                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
442                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
443                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
444                         BIT(IEEE80211_STYPE_AUTH >> 4) |
445                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
446                         BIT(IEEE80211_STYPE_ACTION >> 4),
447         },
448         [NL80211_IFTYPE_AP_VLAN] = {
449                 /* copy AP */
450                 .tx = 0xffff,
451                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
452                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
453                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
454                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
456                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
457                         BIT(IEEE80211_STYPE_ACTION >> 4),
458         },
459 };
460
461 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
462                                         const struct ieee80211_ops *ops)
463 {
464         struct ieee80211_local *local;
465         int priv_size, i;
466         struct wiphy *wiphy;
467
468         /* Ensure 32-byte alignment of our private data and hw private data.
469          * We use the wiphy priv data for both our ieee80211_local and for
470          * the driver's private data
471          *
472          * In memory it'll be like this:
473          *
474          * +-------------------------+
475          * | struct wiphy           |
476          * +-------------------------+
477          * | struct ieee80211_local  |
478          * +-------------------------+
479          * | driver's private data   |
480          * +-------------------------+
481          *
482          */
483         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
484
485         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
486
487         if (!wiphy)
488                 return NULL;
489
490         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
491
492         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
493                         WIPHY_FLAG_4ADDR_AP |
494                         WIPHY_FLAG_4ADDR_STATION;
495         wiphy->privid = mac80211_wiphy_privid;
496
497         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
498
499         local = wiphy_priv(wiphy);
500
501         local->hw.wiphy = wiphy;
502
503         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
504
505         BUG_ON(!ops->tx);
506         BUG_ON(!ops->start);
507         BUG_ON(!ops->stop);
508         BUG_ON(!ops->config);
509         BUG_ON(!ops->add_interface);
510         BUG_ON(!ops->remove_interface);
511         BUG_ON(!ops->configure_filter);
512         local->ops = ops;
513
514         /* set up some defaults */
515         local->hw.queues = 1;
516         local->hw.max_rates = 1;
517         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
518         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
519         local->user_power_level = -1;
520         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
521         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
522
523         INIT_LIST_HEAD(&local->interfaces);
524
525         __hw_addr_init(&local->mc_list);
526
527         mutex_init(&local->iflist_mtx);
528         mutex_init(&local->mtx);
529
530         mutex_init(&local->key_mtx);
531         spin_lock_init(&local->filter_lock);
532         spin_lock_init(&local->queue_stop_reason_lock);
533
534         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
535
536         ieee80211_work_init(local);
537
538         INIT_WORK(&local->restart_work, ieee80211_restart_work);
539
540         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
541         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
542         local->smps_mode = IEEE80211_SMPS_OFF;
543
544         INIT_WORK(&local->dynamic_ps_enable_work,
545                   ieee80211_dynamic_ps_enable_work);
546         INIT_WORK(&local->dynamic_ps_disable_work,
547                   ieee80211_dynamic_ps_disable_work);
548         setup_timer(&local->dynamic_ps_timer,
549                     ieee80211_dynamic_ps_timer, (unsigned long) local);
550
551         sta_info_init(local);
552
553         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
554                 skb_queue_head_init(&local->pending[i]);
555                 atomic_set(&local->agg_queue_stop[i], 0);
556         }
557         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
558                      (unsigned long)local);
559
560         tasklet_init(&local->tasklet,
561                      ieee80211_tasklet_handler,
562                      (unsigned long) local);
563
564         skb_queue_head_init(&local->skb_queue);
565         skb_queue_head_init(&local->skb_queue_unreliable);
566
567         /* init dummy netdev for use w/ NAPI */
568         init_dummy_netdev(&local->napi_dev);
569
570         return local_to_hw(local);
571 }
572 EXPORT_SYMBOL(ieee80211_alloc_hw);
573
574 int ieee80211_register_hw(struct ieee80211_hw *hw)
575 {
576         struct ieee80211_local *local = hw_to_local(hw);
577         int result;
578         enum ieee80211_band band;
579         int channels, max_bitrates;
580         bool supp_ht;
581         static const u32 cipher_suites[] = {
582                 /* keep WEP first, it may be removed below */
583                 WLAN_CIPHER_SUITE_WEP40,
584                 WLAN_CIPHER_SUITE_WEP104,
585                 WLAN_CIPHER_SUITE_TKIP,
586                 WLAN_CIPHER_SUITE_CCMP,
587
588                 /* keep last -- depends on hw flags! */
589                 WLAN_CIPHER_SUITE_AES_CMAC
590         };
591
592         /*
593          * generic code guarantees at least one band,
594          * set this very early because much code assumes
595          * that hw.conf.channel is assigned
596          */
597         channels = 0;
598         max_bitrates = 0;
599         supp_ht = false;
600         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
601                 struct ieee80211_supported_band *sband;
602
603                 sband = local->hw.wiphy->bands[band];
604                 if (!sband)
605                         continue;
606                 if (!local->oper_channel) {
607                         /* init channel we're on */
608                         local->hw.conf.channel =
609                         local->oper_channel = &sband->channels[0];
610                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
611                 }
612                 channels += sband->n_channels;
613
614                 if (max_bitrates < sband->n_bitrates)
615                         max_bitrates = sband->n_bitrates;
616                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
617         }
618
619         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
620                                       sizeof(void *) * channels, GFP_KERNEL);
621         if (!local->int_scan_req)
622                 return -ENOMEM;
623
624         /* if low-level driver supports AP, we also support VLAN */
625         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
626                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
627
628         /* mac80211 always supports monitor */
629         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
630
631 #ifndef CONFIG_MAC80211_MESH
632         /* mesh depends on Kconfig, but drivers should set it if they want */
633         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
634 #endif
635
636         /* mac80211 supports control port protocol changing */
637         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
638
639         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
640                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
641         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
642                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
643
644         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
645              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
646              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
647
648         /*
649          * Calculate scan IE length -- we need this to alloc
650          * memory and to subtract from the driver limit. It
651          * includes the (extended) supported rates and HT
652          * information -- SSID is the driver's responsibility.
653          */
654         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
655         if (supp_ht)
656                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
657
658         if (!local->ops->hw_scan) {
659                 /* For hw_scan, driver needs to set these up. */
660                 local->hw.wiphy->max_scan_ssids = 4;
661                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
662         }
663
664         /*
665          * If the driver supports any scan IEs, then assume the
666          * limit includes the IEs mac80211 will add, otherwise
667          * leave it at zero and let the driver sort it out; we
668          * still pass our IEs to the driver but userspace will
669          * not be allowed to in that case.
670          */
671         if (local->hw.wiphy->max_scan_ie_len)
672                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
673
674         /* Set up cipher suites unless driver already did */
675         if (!local->hw.wiphy->cipher_suites) {
676                 local->hw.wiphy->cipher_suites = cipher_suites;
677                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
678                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
679                         local->hw.wiphy->n_cipher_suites--;
680         }
681         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
682                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
683                         local->hw.wiphy->cipher_suites += 2;
684                         local->hw.wiphy->n_cipher_suites -= 2;
685                 } else {
686                         u32 *suites;
687                         int r, w = 0;
688
689                         /* Filter out WEP */
690
691                         suites = kmemdup(
692                                 local->hw.wiphy->cipher_suites,
693                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
694                                 GFP_KERNEL);
695                         if (!suites)
696                                 return -ENOMEM;
697                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
698                                 u32 suite = local->hw.wiphy->cipher_suites[r];
699                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
700                                     suite == WLAN_CIPHER_SUITE_WEP104)
701                                         continue;
702                                 suites[w++] = suite;
703                         }
704                         local->hw.wiphy->cipher_suites = suites;
705                         local->hw.wiphy->n_cipher_suites = w;
706                         local->wiphy_ciphers_allocated = true;
707                 }
708         }
709
710         result = wiphy_register(local->hw.wiphy);
711         if (result < 0)
712                 goto fail_wiphy_register;
713
714         /*
715          * We use the number of queues for feature tests (QoS, HT) internally
716          * so restrict them appropriately.
717          */
718         if (hw->queues > IEEE80211_MAX_QUEUES)
719                 hw->queues = IEEE80211_MAX_QUEUES;
720
721         local->workqueue =
722                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
723         if (!local->workqueue) {
724                 result = -ENOMEM;
725                 goto fail_workqueue;
726         }
727
728         /*
729          * The hardware needs headroom for sending the frame,
730          * and we need some headroom for passing the frame to monitor
731          * interfaces, but never both at the same time.
732          */
733         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
734                         sizeof(struct ieee80211_tx_status_rtap_hdr));
735         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
736                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
737
738         debugfs_hw_add(local);
739
740         /*
741          * if the driver doesn't specify a max listen interval we
742          * use 5 which should be a safe default
743          */
744         if (local->hw.max_listen_interval == 0)
745                 local->hw.max_listen_interval = 5;
746
747         local->hw.conf.listen_interval = local->hw.max_listen_interval;
748
749         local->dynamic_ps_forced_timeout = -1;
750
751         result = sta_info_start(local);
752         if (result < 0)
753                 goto fail_sta_info;
754
755         result = ieee80211_wep_init(local);
756         if (result < 0)
757                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
758                             result);
759
760         rtnl_lock();
761
762         result = ieee80211_init_rate_ctrl_alg(local,
763                                               hw->rate_control_algorithm);
764         if (result < 0) {
765                 wiphy_debug(local->hw.wiphy,
766                             "Failed to initialize rate control algorithm\n");
767                 goto fail_rate;
768         }
769
770         /* add one default STA interface if supported */
771         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
772                 result = ieee80211_if_add(local, "wlan%d", NULL,
773                                           NL80211_IFTYPE_STATION, NULL);
774                 if (result)
775                         wiphy_warn(local->hw.wiphy,
776                                    "Failed to add default virtual iface\n");
777         }
778
779         rtnl_unlock();
780
781         ieee80211_led_init(local);
782
783         local->network_latency_notifier.notifier_call =
784                 ieee80211_max_network_latency;
785         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
786                                      &local->network_latency_notifier);
787         if (result) {
788                 rtnl_lock();
789                 goto fail_pm_qos;
790         }
791
792 #ifdef CONFIG_INET
793         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
794         result = register_inetaddr_notifier(&local->ifa_notifier);
795         if (result)
796                 goto fail_ifa;
797 #endif
798
799         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
800                         local->hw.napi_weight);
801
802         return 0;
803
804 #ifdef CONFIG_INET
805  fail_ifa:
806         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
807                                &local->network_latency_notifier);
808         rtnl_lock();
809 #endif
810  fail_pm_qos:
811         ieee80211_led_exit(local);
812         ieee80211_remove_interfaces(local);
813  fail_rate:
814         rtnl_unlock();
815         ieee80211_wep_free(local);
816         sta_info_stop(local);
817  fail_sta_info:
818         destroy_workqueue(local->workqueue);
819  fail_workqueue:
820         wiphy_unregister(local->hw.wiphy);
821  fail_wiphy_register:
822         if (local->wiphy_ciphers_allocated)
823                 kfree(local->hw.wiphy->cipher_suites);
824         kfree(local->int_scan_req);
825         return result;
826 }
827 EXPORT_SYMBOL(ieee80211_register_hw);
828
829 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
830 {
831         struct ieee80211_local *local = hw_to_local(hw);
832
833         tasklet_kill(&local->tx_pending_tasklet);
834         tasklet_kill(&local->tasklet);
835
836         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
837                                &local->network_latency_notifier);
838 #ifdef CONFIG_INET
839         unregister_inetaddr_notifier(&local->ifa_notifier);
840 #endif
841
842         rtnl_lock();
843
844         /*
845          * At this point, interface list manipulations are fine
846          * because the driver cannot be handing us frames any
847          * more and the tasklet is killed.
848          */
849         ieee80211_remove_interfaces(local);
850
851         rtnl_unlock();
852
853         /*
854          * Now all work items will be gone, but the
855          * timer might still be armed, so delete it
856          */
857         del_timer_sync(&local->work_timer);
858
859         cancel_work_sync(&local->restart_work);
860         cancel_work_sync(&local->reconfig_filter);
861
862         ieee80211_clear_tx_pending(local);
863         sta_info_stop(local);
864         rate_control_deinitialize(local);
865
866         if (skb_queue_len(&local->skb_queue) ||
867             skb_queue_len(&local->skb_queue_unreliable))
868                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
869         skb_queue_purge(&local->skb_queue);
870         skb_queue_purge(&local->skb_queue_unreliable);
871
872         destroy_workqueue(local->workqueue);
873         wiphy_unregister(local->hw.wiphy);
874         ieee80211_wep_free(local);
875         ieee80211_led_exit(local);
876         kfree(local->int_scan_req);
877 }
878 EXPORT_SYMBOL(ieee80211_unregister_hw);
879
880 void ieee80211_free_hw(struct ieee80211_hw *hw)
881 {
882         struct ieee80211_local *local = hw_to_local(hw);
883
884         mutex_destroy(&local->iflist_mtx);
885         mutex_destroy(&local->mtx);
886
887         if (local->wiphy_ciphers_allocated)
888                 kfree(local->hw.wiphy->cipher_suites);
889
890         wiphy_free(local->hw.wiphy);
891 }
892 EXPORT_SYMBOL(ieee80211_free_hw);
893
894 static int __init ieee80211_init(void)
895 {
896         struct sk_buff *skb;
897         int ret;
898
899         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
900         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
901                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
902
903         ret = rc80211_minstrel_init();
904         if (ret)
905                 return ret;
906
907         ret = rc80211_minstrel_ht_init();
908         if (ret)
909                 goto err_minstrel;
910
911         ret = rc80211_pid_init();
912         if (ret)
913                 goto err_pid;
914
915         ret = ieee80211_iface_init();
916         if (ret)
917                 goto err_netdev;
918
919         return 0;
920  err_netdev:
921         rc80211_pid_exit();
922  err_pid:
923         rc80211_minstrel_ht_exit();
924  err_minstrel:
925         rc80211_minstrel_exit();
926
927         return ret;
928 }
929
930 static void __exit ieee80211_exit(void)
931 {
932         rc80211_pid_exit();
933         rc80211_minstrel_ht_exit();
934         rc80211_minstrel_exit();
935
936         /*
937          * For key todo, it'll be empty by now but the work
938          * might still be scheduled.
939          */
940         flush_scheduled_work();
941
942         if (mesh_allocated)
943                 ieee80211s_stop();
944
945         ieee80211_iface_exit();
946 }
947
948
949 subsys_initcall(ieee80211_init);
950 module_exit(ieee80211_exit);
951
952 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
953 MODULE_LICENSE("GPL");