2306d7514fff5bb2c82d609a859a3e826fdd6099
[linux-2.6.git] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35
36 static struct lock_class_key ieee80211_rx_skb_queue_class;
37
38 void ieee80211_configure_filter(struct ieee80211_local *local)
39 {
40         u64 mc;
41         unsigned int changed_flags;
42         unsigned int new_flags = 0;
43
44         if (atomic_read(&local->iff_promiscs))
45                 new_flags |= FIF_PROMISC_IN_BSS;
46
47         if (atomic_read(&local->iff_allmultis))
48                 new_flags |= FIF_ALLMULTI;
49
50         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning))
51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53         if (local->fif_probe_req || local->probe_req_reg)
54                 new_flags |= FIF_PROBE_REQ;
55
56         if (local->fif_fcsfail)
57                 new_flags |= FIF_FCSFAIL;
58
59         if (local->fif_plcpfail)
60                 new_flags |= FIF_PLCPFAIL;
61
62         if (local->fif_control)
63                 new_flags |= FIF_CONTROL;
64
65         if (local->fif_other_bss)
66                 new_flags |= FIF_OTHER_BSS;
67
68         if (local->fif_pspoll)
69                 new_flags |= FIF_PSPOLL;
70
71         spin_lock_bh(&local->filter_lock);
72         changed_flags = local->filter_flags ^ new_flags;
73
74         mc = drv_prepare_multicast(local, &local->mc_list);
75         spin_unlock_bh(&local->filter_lock);
76
77         /* be a bit nasty */
78         new_flags |= (1<<31);
79
80         drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82         WARN_ON(new_flags & (1<<31));
83
84         local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89         struct ieee80211_local *local =
90                 container_of(work, struct ieee80211_local, reconfig_filter);
91
92         ieee80211_configure_filter(local);
93 }
94
95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
96 {
97         struct ieee80211_channel *chan;
98         int ret = 0;
99         int power;
100         enum nl80211_channel_type channel_type;
101         u32 offchannel_flag;
102
103         might_sleep();
104
105         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
106          * may need to change as well.
107          */
108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109         if (local->scan_channel) {
110                 chan = local->scan_channel;
111                 /* If scanning on oper channel, use whatever channel-type
112                  * is currently in use.
113                  */
114                 if (chan == local->oper_channel)
115                         channel_type = local->_oper_channel_type;
116                 else
117                         channel_type = NL80211_CHAN_NO_HT;
118         } else if (local->tmp_channel) {
119                 chan = local->tmp_channel;
120                 channel_type = local->tmp_channel_type;
121         } else {
122                 chan = local->oper_channel;
123                 channel_type = local->_oper_channel_type;
124         }
125
126         if (chan != local->oper_channel ||
127             channel_type != local->_oper_channel_type)
128                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
129         else
130                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
131
132         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
133
134         if (offchannel_flag || chan != local->hw.conf.channel ||
135             channel_type != local->hw.conf.channel_type) {
136                 local->hw.conf.channel = chan;
137                 local->hw.conf.channel_type = channel_type;
138                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
139         }
140
141         if (!conf_is_ht(&local->hw.conf)) {
142                 /*
143                  * mac80211.h documents that this is only valid
144                  * when the channel is set to an HT type, and
145                  * that otherwise STATIC is used.
146                  */
147                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
148         } else if (local->hw.conf.smps_mode != local->smps_mode) {
149                 local->hw.conf.smps_mode = local->smps_mode;
150                 changed |= IEEE80211_CONF_CHANGE_SMPS;
151         }
152
153         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
154             test_bit(SCAN_HW_SCANNING, &local->scanning))
155                 power = chan->max_power;
156         else
157                 power = local->power_constr_level ?
158                         min(chan->max_power,
159                                 (chan->max_reg_power  - local->power_constr_level)) :
160                         chan->max_power;
161
162         if (local->user_power_level >= 0)
163                 power = min(power, local->user_power_level);
164
165         if (local->hw.conf.power_level != power) {
166                 changed |= IEEE80211_CONF_CHANGE_POWER;
167                 local->hw.conf.power_level = power;
168         }
169
170         if (changed && local->open_count) {
171                 ret = drv_config(local, changed);
172                 /*
173                  * Goal:
174                  * HW reconfiguration should never fail, the driver has told
175                  * us what it can support so it should live up to that promise.
176                  *
177                  * Current status:
178                  * rfkill is not integrated with mac80211 and a
179                  * configuration command can thus fail if hardware rfkill
180                  * is enabled
181                  *
182                  * FIXME: integrate rfkill with mac80211 and then add this
183                  * WARN_ON() back
184                  *
185                  */
186                 /* WARN_ON(ret); */
187         }
188
189         return ret;
190 }
191
192 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
193                                       u32 changed)
194 {
195         struct ieee80211_local *local = sdata->local;
196         static const u8 zero[ETH_ALEN] = { 0 };
197
198         if (!changed)
199                 return;
200
201         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
202                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
203         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
205         else if (sdata->vif.type == NL80211_IFTYPE_AP)
206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
207         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
208                 sdata->vif.bss_conf.bssid = NULL;
209         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
210                 sdata->vif.bss_conf.bssid = zero;
211         } else {
212                 WARN_ON(1);
213                 return;
214         }
215
216         switch (sdata->vif.type) {
217         case NL80211_IFTYPE_AP:
218         case NL80211_IFTYPE_ADHOC:
219         case NL80211_IFTYPE_WDS:
220         case NL80211_IFTYPE_MESH_POINT:
221                 break;
222         default:
223                 /* do not warn to simplify caller in scan.c */
224                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
225                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
226                         return;
227                 break;
228         }
229
230         if (changed & BSS_CHANGED_BEACON_ENABLED) {
231                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
232                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
233                         sdata->vif.bss_conf.enable_beacon = false;
234                 } else {
235                         /*
236                          * Beacon should be enabled, but AP mode must
237                          * check whether there is a beacon configured.
238                          */
239                         switch (sdata->vif.type) {
240                         case NL80211_IFTYPE_AP:
241                                 sdata->vif.bss_conf.enable_beacon =
242                                         !!sdata->u.ap.beacon;
243                                 break;
244                         case NL80211_IFTYPE_ADHOC:
245                                 sdata->vif.bss_conf.enable_beacon =
246                                         !!sdata->u.ibss.presp;
247                                 break;
248 #ifdef CONFIG_MAC80211_MESH
249                         case NL80211_IFTYPE_MESH_POINT:
250                                 sdata->vif.bss_conf.enable_beacon =
251                                         !!sdata->u.mesh.mesh_id_len;
252                                 break;
253 #endif
254                         default:
255                                 /* not reached */
256                                 WARN_ON(1);
257                                 break;
258                         }
259                 }
260         }
261
262         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
263 }
264
265 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
266 {
267         sdata->vif.bss_conf.use_cts_prot = false;
268         sdata->vif.bss_conf.use_short_preamble = false;
269         sdata->vif.bss_conf.use_short_slot = false;
270         return BSS_CHANGED_ERP_CTS_PROT |
271                BSS_CHANGED_ERP_PREAMBLE |
272                BSS_CHANGED_ERP_SLOT;
273 }
274
275 static void ieee80211_tasklet_handler(unsigned long data)
276 {
277         struct ieee80211_local *local = (struct ieee80211_local *) data;
278         struct sta_info *sta, *tmp;
279         struct skb_eosp_msg_data *eosp_data;
280         struct sk_buff *skb;
281
282         while ((skb = skb_dequeue(&local->skb_queue)) ||
283                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
284                 switch (skb->pkt_type) {
285                 case IEEE80211_RX_MSG:
286                         /* Clear skb->pkt_type in order to not confuse kernel
287                          * netstack. */
288                         skb->pkt_type = 0;
289                         ieee80211_rx(local_to_hw(local), skb);
290                         break;
291                 case IEEE80211_TX_STATUS_MSG:
292                         skb->pkt_type = 0;
293                         ieee80211_tx_status(local_to_hw(local), skb);
294                         break;
295                 case IEEE80211_EOSP_MSG:
296                         eosp_data = (void *)skb->cb;
297                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
298                                 /* skip wrong virtual interface */
299                                 if (memcmp(eosp_data->iface,
300                                            sta->sdata->vif.addr, ETH_ALEN))
301                                         continue;
302                                 clear_sta_flag(sta, WLAN_STA_SP);
303                                 break;
304                         }
305                         dev_kfree_skb(skb);
306                         break;
307                 default:
308                         WARN(1, "mac80211: Packet is of unknown type %d\n",
309                              skb->pkt_type);
310                         dev_kfree_skb(skb);
311                         break;
312                 }
313         }
314 }
315
316 static void ieee80211_restart_work(struct work_struct *work)
317 {
318         struct ieee80211_local *local =
319                 container_of(work, struct ieee80211_local, restart_work);
320
321         /* wait for scan work complete */
322         flush_workqueue(local->workqueue);
323
324         mutex_lock(&local->mtx);
325         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
326              local->sched_scanning,
327                 "%s called with hardware scan in progress\n", __func__);
328         mutex_unlock(&local->mtx);
329
330         rtnl_lock();
331         ieee80211_scan_cancel(local);
332         ieee80211_reconfig(local);
333         rtnl_unlock();
334 }
335
336 void ieee80211_restart_hw(struct ieee80211_hw *hw)
337 {
338         struct ieee80211_local *local = hw_to_local(hw);
339
340         trace_api_restart_hw(local);
341
342         wiphy_info(hw->wiphy,
343                    "Hardware restart was requested\n");
344
345         /* use this reason, ieee80211_reconfig will unblock it */
346         ieee80211_stop_queues_by_reason(hw,
347                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
348
349         schedule_work(&local->restart_work);
350 }
351 EXPORT_SYMBOL(ieee80211_restart_hw);
352
353 static void ieee80211_recalc_smps_work(struct work_struct *work)
354 {
355         struct ieee80211_local *local =
356                 container_of(work, struct ieee80211_local, recalc_smps);
357
358         mutex_lock(&local->iflist_mtx);
359         ieee80211_recalc_smps(local);
360         mutex_unlock(&local->iflist_mtx);
361 }
362
363 #ifdef CONFIG_INET
364 static int ieee80211_ifa_changed(struct notifier_block *nb,
365                                  unsigned long data, void *arg)
366 {
367         struct in_ifaddr *ifa = arg;
368         struct ieee80211_local *local =
369                 container_of(nb, struct ieee80211_local,
370                              ifa_notifier);
371         struct net_device *ndev = ifa->ifa_dev->dev;
372         struct wireless_dev *wdev = ndev->ieee80211_ptr;
373         struct in_device *idev;
374         struct ieee80211_sub_if_data *sdata;
375         struct ieee80211_bss_conf *bss_conf;
376         struct ieee80211_if_managed *ifmgd;
377         int c = 0;
378
379         /* Make sure it's our interface that got changed */
380         if (!wdev)
381                 return NOTIFY_DONE;
382
383         if (wdev->wiphy != local->hw.wiphy)
384                 return NOTIFY_DONE;
385
386         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
387         bss_conf = &sdata->vif.bss_conf;
388
389         /* ARP filtering is only supported in managed mode */
390         if (sdata->vif.type != NL80211_IFTYPE_STATION)
391                 return NOTIFY_DONE;
392
393         idev = __in_dev_get_rtnl(sdata->dev);
394         if (!idev)
395                 return NOTIFY_DONE;
396
397         ifmgd = &sdata->u.mgd;
398         mutex_lock(&ifmgd->mtx);
399
400         /* Copy the addresses to the bss_conf list */
401         ifa = idev->ifa_list;
402         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
403                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
404                 ifa = ifa->ifa_next;
405                 c++;
406         }
407
408         /* If not all addresses fit the list, disable filtering */
409         if (ifa) {
410                 sdata->arp_filter_state = false;
411                 c = 0;
412         } else {
413                 sdata->arp_filter_state = true;
414         }
415         bss_conf->arp_addr_cnt = c;
416
417         /* Configure driver only if associated (which also implies it is up) */
418         if (ifmgd->associated) {
419                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
420                 ieee80211_bss_info_change_notify(sdata,
421                                                  BSS_CHANGED_ARP_FILTER);
422         }
423
424         mutex_unlock(&ifmgd->mtx);
425
426         return NOTIFY_DONE;
427 }
428 #endif
429
430 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
431 {
432         struct ieee80211_local *local =
433                 container_of(napi, struct ieee80211_local, napi);
434
435         return local->ops->napi_poll(&local->hw, budget);
436 }
437
438 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
439 {
440         struct ieee80211_local *local = hw_to_local(hw);
441
442         napi_schedule(&local->napi);
443 }
444 EXPORT_SYMBOL(ieee80211_napi_schedule);
445
446 void ieee80211_napi_complete(struct ieee80211_hw *hw)
447 {
448         struct ieee80211_local *local = hw_to_local(hw);
449
450         napi_complete(&local->napi);
451 }
452 EXPORT_SYMBOL(ieee80211_napi_complete);
453
454 /* There isn't a lot of sense in it, but you can transmit anything you like */
455 static const struct ieee80211_txrx_stypes
456 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
457         [NL80211_IFTYPE_ADHOC] = {
458                 .tx = 0xffff,
459                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
460         },
461         [NL80211_IFTYPE_STATION] = {
462                 .tx = 0xffff,
463                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
464                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
465         },
466         [NL80211_IFTYPE_AP] = {
467                 .tx = 0xffff,
468                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
469                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
470                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
471                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
472                         BIT(IEEE80211_STYPE_AUTH >> 4) |
473                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
474                         BIT(IEEE80211_STYPE_ACTION >> 4),
475         },
476         [NL80211_IFTYPE_AP_VLAN] = {
477                 /* copy AP */
478                 .tx = 0xffff,
479                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
480                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
481                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
482                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
483                         BIT(IEEE80211_STYPE_AUTH >> 4) |
484                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
485                         BIT(IEEE80211_STYPE_ACTION >> 4),
486         },
487         [NL80211_IFTYPE_P2P_CLIENT] = {
488                 .tx = 0xffff,
489                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
491         },
492         [NL80211_IFTYPE_P2P_GO] = {
493                 .tx = 0xffff,
494                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
495                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
496                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
497                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
498                         BIT(IEEE80211_STYPE_AUTH >> 4) |
499                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
500                         BIT(IEEE80211_STYPE_ACTION >> 4),
501         },
502         [NL80211_IFTYPE_MESH_POINT] = {
503                 .tx = 0xffff,
504                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
505                         BIT(IEEE80211_STYPE_AUTH >> 4) |
506                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
507         },
508 };
509
510 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
511         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
512                              IEEE80211_HT_AMPDU_PARM_DENSITY,
513
514         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
515                                 IEEE80211_HT_CAP_MAX_AMSDU |
516                                 IEEE80211_HT_CAP_SGI_40),
517         .mcs = {
518                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
519                              0xff, 0xff, 0xff, 0xff, 0xff, },
520         },
521 };
522
523 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
524                                         const struct ieee80211_ops *ops)
525 {
526         struct ieee80211_local *local;
527         int priv_size, i;
528         struct wiphy *wiphy;
529
530         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
531                 return NULL;
532
533         /* Ensure 32-byte alignment of our private data and hw private data.
534          * We use the wiphy priv data for both our ieee80211_local and for
535          * the driver's private data
536          *
537          * In memory it'll be like this:
538          *
539          * +-------------------------+
540          * | struct wiphy           |
541          * +-------------------------+
542          * | struct ieee80211_local  |
543          * +-------------------------+
544          * | driver's private data   |
545          * +-------------------------+
546          *
547          */
548         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
549
550         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
551
552         if (!wiphy)
553                 return NULL;
554
555         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
556
557         wiphy->privid = mac80211_wiphy_privid;
558
559         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
560                         WIPHY_FLAG_4ADDR_AP |
561                         WIPHY_FLAG_4ADDR_STATION |
562                         WIPHY_FLAG_REPORTS_OBSS |
563                         WIPHY_FLAG_OFFCHAN_TX |
564                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
565
566         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
567                           NL80211_FEATURE_HT_IBSS;
568
569         if (!ops->set_key)
570                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
571
572         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
573
574         local = wiphy_priv(wiphy);
575
576         local->hw.wiphy = wiphy;
577
578         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
579
580         BUG_ON(!ops->tx && !ops->tx_frags);
581         BUG_ON(!ops->start);
582         BUG_ON(!ops->stop);
583         BUG_ON(!ops->config);
584         BUG_ON(!ops->add_interface);
585         BUG_ON(!ops->remove_interface);
586         BUG_ON(!ops->configure_filter);
587         local->ops = ops;
588
589         /* set up some defaults */
590         local->hw.queues = 1;
591         local->hw.max_rates = 1;
592         local->hw.max_report_rates = 0;
593         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
594         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
595         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
596         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
597         local->user_power_level = -1;
598         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
599         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
600         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
601
602         INIT_LIST_HEAD(&local->interfaces);
603
604         __hw_addr_init(&local->mc_list);
605
606         mutex_init(&local->iflist_mtx);
607         mutex_init(&local->mtx);
608
609         mutex_init(&local->key_mtx);
610         spin_lock_init(&local->filter_lock);
611         spin_lock_init(&local->queue_stop_reason_lock);
612
613         /*
614          * The rx_skb_queue is only accessed from tasklets,
615          * but other SKB queues are used from within IRQ
616          * context. Therefore, this one needs a different
617          * locking class so our direct, non-irq-safe use of
618          * the queue's lock doesn't throw lockdep warnings.
619          */
620         skb_queue_head_init_class(&local->rx_skb_queue,
621                                   &ieee80211_rx_skb_queue_class);
622
623         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
624
625         ieee80211_work_init(local);
626
627         INIT_WORK(&local->restart_work, ieee80211_restart_work);
628
629         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
630         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
631         local->smps_mode = IEEE80211_SMPS_OFF;
632
633         INIT_WORK(&local->dynamic_ps_enable_work,
634                   ieee80211_dynamic_ps_enable_work);
635         INIT_WORK(&local->dynamic_ps_disable_work,
636                   ieee80211_dynamic_ps_disable_work);
637         setup_timer(&local->dynamic_ps_timer,
638                     ieee80211_dynamic_ps_timer, (unsigned long) local);
639
640         INIT_WORK(&local->sched_scan_stopped_work,
641                   ieee80211_sched_scan_stopped_work);
642
643         spin_lock_init(&local->ack_status_lock);
644         idr_init(&local->ack_status_frames);
645         /* preallocate at least one entry */
646         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
647
648         sta_info_init(local);
649
650         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
651                 skb_queue_head_init(&local->pending[i]);
652                 atomic_set(&local->agg_queue_stop[i], 0);
653         }
654         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
655                      (unsigned long)local);
656
657         tasklet_init(&local->tasklet,
658                      ieee80211_tasklet_handler,
659                      (unsigned long) local);
660
661         skb_queue_head_init(&local->skb_queue);
662         skb_queue_head_init(&local->skb_queue_unreliable);
663
664         /* init dummy netdev for use w/ NAPI */
665         init_dummy_netdev(&local->napi_dev);
666
667         ieee80211_led_names(local);
668
669         ieee80211_hw_roc_setup(local);
670
671         return local_to_hw(local);
672 }
673 EXPORT_SYMBOL(ieee80211_alloc_hw);
674
675 int ieee80211_register_hw(struct ieee80211_hw *hw)
676 {
677         struct ieee80211_local *local = hw_to_local(hw);
678         int result, i;
679         enum ieee80211_band band;
680         int channels, max_bitrates;
681         bool supp_ht;
682         static const u32 cipher_suites[] = {
683                 /* keep WEP first, it may be removed below */
684                 WLAN_CIPHER_SUITE_WEP40,
685                 WLAN_CIPHER_SUITE_WEP104,
686                 WLAN_CIPHER_SUITE_TKIP,
687                 WLAN_CIPHER_SUITE_CCMP,
688
689                 /* keep last -- depends on hw flags! */
690                 WLAN_CIPHER_SUITE_AES_CMAC
691         };
692
693         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
694 #ifdef CONFIG_PM
695             && (!local->ops->suspend || !local->ops->resume)
696 #endif
697             )
698                 return -EINVAL;
699
700         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
701                 return -EINVAL;
702
703         if (hw->max_report_rates == 0)
704                 hw->max_report_rates = hw->max_rates;
705
706         /*
707          * generic code guarantees at least one band,
708          * set this very early because much code assumes
709          * that hw.conf.channel is assigned
710          */
711         channels = 0;
712         max_bitrates = 0;
713         supp_ht = false;
714         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
715                 struct ieee80211_supported_band *sband;
716
717                 sband = local->hw.wiphy->bands[band];
718                 if (!sband)
719                         continue;
720                 if (!local->oper_channel) {
721                         /* init channel we're on */
722                         local->hw.conf.channel =
723                         local->oper_channel = &sband->channels[0];
724                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
725                 }
726                 channels += sband->n_channels;
727
728                 if (max_bitrates < sband->n_bitrates)
729                         max_bitrates = sband->n_bitrates;
730                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
731         }
732
733         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
734                                       sizeof(void *) * channels, GFP_KERNEL);
735         if (!local->int_scan_req)
736                 return -ENOMEM;
737
738         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
739                 if (!local->hw.wiphy->bands[band])
740                         continue;
741                 local->int_scan_req->rates[band] = (u32) -1;
742         }
743
744         /* if low-level driver supports AP, we also support VLAN */
745         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
746                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
747                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
748         }
749
750         /* mac80211 always supports monitor */
751         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
752         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
753
754         /*
755          * mac80211 doesn't support more than 1 channel, and also not more
756          * than one IBSS interface
757          */
758         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
759                 const struct ieee80211_iface_combination *c;
760                 int j;
761
762                 c = &hw->wiphy->iface_combinations[i];
763
764                 if (c->num_different_channels > 1)
765                         return -EINVAL;
766
767                 for (j = 0; j < c->n_limits; j++)
768                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
769                             c->limits[j].max > 1)
770                                 return -EINVAL;
771         }
772
773 #ifndef CONFIG_MAC80211_MESH
774         /* mesh depends on Kconfig, but drivers should set it if they want */
775         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
776 #endif
777
778         /* if the underlying driver supports mesh, mac80211 will (at least)
779          * provide routing of mesh authentication frames to userspace */
780         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
781                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
782
783         /* mac80211 supports control port protocol changing */
784         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
785
786         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
787                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
788         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
789                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
790
791         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
792              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
793              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
794
795         /*
796          * Calculate scan IE length -- we need this to alloc
797          * memory and to subtract from the driver limit. It
798          * includes the DS Params, (extended) supported rates, and HT
799          * information -- SSID is the driver's responsibility.
800          */
801         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
802                 3 /* DS Params */;
803         if (supp_ht)
804                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
805
806         if (!local->ops->hw_scan) {
807                 /* For hw_scan, driver needs to set these up. */
808                 local->hw.wiphy->max_scan_ssids = 4;
809                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
810         }
811
812         /*
813          * If the driver supports any scan IEs, then assume the
814          * limit includes the IEs mac80211 will add, otherwise
815          * leave it at zero and let the driver sort it out; we
816          * still pass our IEs to the driver but userspace will
817          * not be allowed to in that case.
818          */
819         if (local->hw.wiphy->max_scan_ie_len)
820                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
821
822         /* Set up cipher suites unless driver already did */
823         if (!local->hw.wiphy->cipher_suites) {
824                 local->hw.wiphy->cipher_suites = cipher_suites;
825                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
826                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
827                         local->hw.wiphy->n_cipher_suites--;
828         }
829         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
830                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
831                         local->hw.wiphy->cipher_suites += 2;
832                         local->hw.wiphy->n_cipher_suites -= 2;
833                 } else {
834                         u32 *suites;
835                         int r, w = 0;
836
837                         /* Filter out WEP */
838
839                         suites = kmemdup(
840                                 local->hw.wiphy->cipher_suites,
841                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
842                                 GFP_KERNEL);
843                         if (!suites)
844                                 return -ENOMEM;
845                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
846                                 u32 suite = local->hw.wiphy->cipher_suites[r];
847                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
848                                     suite == WLAN_CIPHER_SUITE_WEP104)
849                                         continue;
850                                 suites[w++] = suite;
851                         }
852                         local->hw.wiphy->cipher_suites = suites;
853                         local->hw.wiphy->n_cipher_suites = w;
854                         local->wiphy_ciphers_allocated = true;
855                 }
856         }
857
858         if (!local->ops->remain_on_channel)
859                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
860
861         if (local->ops->sched_scan_start)
862                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
863
864         /* mac80211 based drivers don't support internal TDLS setup */
865         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
866                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
867
868         result = wiphy_register(local->hw.wiphy);
869         if (result < 0)
870                 goto fail_wiphy_register;
871
872         /*
873          * We use the number of queues for feature tests (QoS, HT) internally
874          * so restrict them appropriately.
875          */
876         if (hw->queues > IEEE80211_MAX_QUEUES)
877                 hw->queues = IEEE80211_MAX_QUEUES;
878
879         local->workqueue =
880                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
881         if (!local->workqueue) {
882                 result = -ENOMEM;
883                 goto fail_workqueue;
884         }
885
886         /*
887          * The hardware needs headroom for sending the frame,
888          * and we need some headroom for passing the frame to monitor
889          * interfaces, but never both at the same time.
890          */
891         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
892                                    IEEE80211_TX_STATUS_HEADROOM);
893
894         debugfs_hw_add(local);
895
896         /*
897          * if the driver doesn't specify a max listen interval we
898          * use 5 which should be a safe default
899          */
900         if (local->hw.max_listen_interval == 0)
901                 local->hw.max_listen_interval = 5;
902
903         local->hw.conf.listen_interval = local->hw.max_listen_interval;
904
905         local->dynamic_ps_forced_timeout = -1;
906
907         result = ieee80211_wep_init(local);
908         if (result < 0)
909                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
910                             result);
911
912         ieee80211_led_init(local);
913
914         rtnl_lock();
915
916         result = ieee80211_init_rate_ctrl_alg(local,
917                                               hw->rate_control_algorithm);
918         if (result < 0) {
919                 wiphy_debug(local->hw.wiphy,
920                             "Failed to initialize rate control algorithm\n");
921                 goto fail_rate;
922         }
923
924         /* add one default STA interface if supported */
925         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
926                 result = ieee80211_if_add(local, "wlan%d", NULL,
927                                           NL80211_IFTYPE_STATION, NULL);
928                 if (result)
929                         wiphy_warn(local->hw.wiphy,
930                                    "Failed to add default virtual iface\n");
931         }
932
933         rtnl_unlock();
934
935         local->network_latency_notifier.notifier_call =
936                 ieee80211_max_network_latency;
937         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
938                                      &local->network_latency_notifier);
939         if (result) {
940                 rtnl_lock();
941                 goto fail_pm_qos;
942         }
943
944 #ifdef CONFIG_INET
945         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
946         result = register_inetaddr_notifier(&local->ifa_notifier);
947         if (result)
948                 goto fail_ifa;
949 #endif
950
951         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
952                         local->hw.napi_weight);
953
954         return 0;
955
956 #ifdef CONFIG_INET
957  fail_ifa:
958         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
959                                &local->network_latency_notifier);
960         rtnl_lock();
961 #endif
962  fail_pm_qos:
963         ieee80211_led_exit(local);
964         ieee80211_remove_interfaces(local);
965  fail_rate:
966         rtnl_unlock();
967         ieee80211_wep_free(local);
968         sta_info_stop(local);
969         destroy_workqueue(local->workqueue);
970  fail_workqueue:
971         wiphy_unregister(local->hw.wiphy);
972  fail_wiphy_register:
973         if (local->wiphy_ciphers_allocated)
974                 kfree(local->hw.wiphy->cipher_suites);
975         kfree(local->int_scan_req);
976         return result;
977 }
978 EXPORT_SYMBOL(ieee80211_register_hw);
979
980 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
981 {
982         struct ieee80211_local *local = hw_to_local(hw);
983
984         tasklet_kill(&local->tx_pending_tasklet);
985         tasklet_kill(&local->tasklet);
986
987         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
988                                &local->network_latency_notifier);
989 #ifdef CONFIG_INET
990         unregister_inetaddr_notifier(&local->ifa_notifier);
991 #endif
992
993         rtnl_lock();
994
995         /*
996          * At this point, interface list manipulations are fine
997          * because the driver cannot be handing us frames any
998          * more and the tasklet is killed.
999          */
1000         ieee80211_remove_interfaces(local);
1001
1002         rtnl_unlock();
1003
1004         /*
1005          * Now all work items will be gone, but the
1006          * timer might still be armed, so delete it
1007          */
1008         del_timer_sync(&local->work_timer);
1009
1010         cancel_work_sync(&local->restart_work);
1011         cancel_work_sync(&local->reconfig_filter);
1012
1013         ieee80211_clear_tx_pending(local);
1014         rate_control_deinitialize(local);
1015
1016         if (skb_queue_len(&local->skb_queue) ||
1017             skb_queue_len(&local->skb_queue_unreliable))
1018                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1019         skb_queue_purge(&local->skb_queue);
1020         skb_queue_purge(&local->skb_queue_unreliable);
1021         skb_queue_purge(&local->rx_skb_queue);
1022
1023         destroy_workqueue(local->workqueue);
1024         wiphy_unregister(local->hw.wiphy);
1025         sta_info_stop(local);
1026         ieee80211_wep_free(local);
1027         ieee80211_led_exit(local);
1028         kfree(local->int_scan_req);
1029 }
1030 EXPORT_SYMBOL(ieee80211_unregister_hw);
1031
1032 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1033 {
1034         WARN_ONCE(1, "Have pending ack frames!\n");
1035         kfree_skb(p);
1036         return 0;
1037 }
1038
1039 void ieee80211_free_hw(struct ieee80211_hw *hw)
1040 {
1041         struct ieee80211_local *local = hw_to_local(hw);
1042
1043         mutex_destroy(&local->iflist_mtx);
1044         mutex_destroy(&local->mtx);
1045
1046         if (local->wiphy_ciphers_allocated)
1047                 kfree(local->hw.wiphy->cipher_suites);
1048
1049         idr_for_each(&local->ack_status_frames,
1050                      ieee80211_free_ack_frame, NULL);
1051         idr_destroy(&local->ack_status_frames);
1052
1053         wiphy_free(local->hw.wiphy);
1054 }
1055 EXPORT_SYMBOL(ieee80211_free_hw);
1056
1057 static int __init ieee80211_init(void)
1058 {
1059         struct sk_buff *skb;
1060         int ret;
1061
1062         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1063         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1064                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1065
1066         ret = rc80211_minstrel_init();
1067         if (ret)
1068                 return ret;
1069
1070         ret = rc80211_minstrel_ht_init();
1071         if (ret)
1072                 goto err_minstrel;
1073
1074         ret = rc80211_pid_init();
1075         if (ret)
1076                 goto err_pid;
1077
1078         ret = ieee80211_iface_init();
1079         if (ret)
1080                 goto err_netdev;
1081
1082         return 0;
1083  err_netdev:
1084         rc80211_pid_exit();
1085  err_pid:
1086         rc80211_minstrel_ht_exit();
1087  err_minstrel:
1088         rc80211_minstrel_exit();
1089
1090         return ret;
1091 }
1092
1093 static void __exit ieee80211_exit(void)
1094 {
1095         rc80211_pid_exit();
1096         rc80211_minstrel_ht_exit();
1097         rc80211_minstrel_exit();
1098
1099         if (mesh_allocated)
1100                 ieee80211s_stop();
1101
1102         ieee80211_iface_exit();
1103
1104         rcu_barrier();
1105 }
1106
1107
1108 subsys_initcall(ieee80211_init);
1109 module_exit(ieee80211_exit);
1110
1111 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1112 MODULE_LICENSE("GPL");