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USB: convert drivers/media/* to use module_usb_driver()
[zen-stable.git] / net / mac80211 / main.c
blobd999bf3b84e1b27d0d79c91d44b7771756d92a3e
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, *scan_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 = scan_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, *scan_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 scan_chan = local->scan_channel;
147
148 /* If this off-channel logic ever changes, ieee80211_on_oper_channel
149 * may need to change as well.
150 */
151 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
152 if (scan_chan) {
153 chan = scan_chan;
154 /* If scanning on oper channel, use whatever channel-type
155 * is currently in use.
156 */
157 if (chan == local->oper_channel)
158 channel_type = local->_oper_channel_type;
159 else
160 channel_type = NL80211_CHAN_NO_HT;
161 } else if (local->tmp_channel) {
162 chan = scan_chan = local->tmp_channel;
163 channel_type = local->tmp_channel_type;
164 } else {
165 chan = local->oper_channel;
166 channel_type = local->_oper_channel_type;
167 }
168
169 if (chan != local->oper_channel ||
170 channel_type != local->_oper_channel_type)
171 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
172 else
173 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
174
175 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
176
177 if (offchannel_flag || chan != local->hw.conf.channel ||
178 channel_type != local->hw.conf.channel_type) {
179 local->hw.conf.channel = chan;
180 local->hw.conf.channel_type = channel_type;
181 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
182 }
183
184 if (!conf_is_ht(&local->hw.conf)) {
185 /*
186 * mac80211.h documents that this is only valid
187 * when the channel is set to an HT type, and
188 * that otherwise STATIC is used.
189 */
190 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
191 } else if (local->hw.conf.smps_mode != local->smps_mode) {
192 local->hw.conf.smps_mode = local->smps_mode;
193 changed |= IEEE80211_CONF_CHANGE_SMPS;
194 }
195
196 if ((local->scanning & SCAN_SW_SCANNING) ||
197 (local->scanning & SCAN_HW_SCANNING))
198 power = chan->max_power;
199 else
200 power = local->power_constr_level ?
201 (chan->max_power - local->power_constr_level) :
202 chan->max_power;
203
204 if (local->user_power_level >= 0)
205 power = min(power, local->user_power_level);
206
207 if (local->hw.conf.power_level != power) {
208 changed |= IEEE80211_CONF_CHANGE_POWER;
209 local->hw.conf.power_level = power;
210 }
211
212 if (changed && local->open_count) {
213 ret = drv_config(local, changed);
214 /*
215 * Goal:
216 * HW reconfiguration should never fail, the driver has told
217 * us what it can support so it should live up to that promise.
218 *
219 * Current status:
220 * rfkill is not integrated with mac80211 and a
221 * configuration command can thus fail if hardware rfkill
222 * is enabled
223 *
224 * FIXME: integrate rfkill with mac80211 and then add this
225 * WARN_ON() back
226 *
227 */
228 /* WARN_ON(ret); */
229 }
230
231 return ret;
232 }
233
234 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
235 u32 changed)
236 {
237 struct ieee80211_local *local = sdata->local;
238 static const u8 zero[ETH_ALEN] = { 0 };
239
240 if (!changed)
241 return;
242
243 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
244 /*
245 * While not associated, claim a BSSID of all-zeroes
246 * so that drivers don't do any weird things with the
247 * BSSID at that time.
248 */
249 if (sdata->vif.bss_conf.assoc)
250 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
251 else
252 sdata->vif.bss_conf.bssid = zero;
253 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
254 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
255 else if (sdata->vif.type == NL80211_IFTYPE_AP)
256 sdata->vif.bss_conf.bssid = sdata->vif.addr;
257 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
258 sdata->vif.bss_conf.bssid = NULL;
259 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
260 sdata->vif.bss_conf.bssid = zero;
261 } else {
262 WARN_ON(1);
263 return;
264 }
265
266 switch (sdata->vif.type) {
267 case NL80211_IFTYPE_AP:
268 case NL80211_IFTYPE_ADHOC:
269 case NL80211_IFTYPE_WDS:
270 case NL80211_IFTYPE_MESH_POINT:
271 break;
272 default:
273 /* do not warn to simplify caller in scan.c */
274 changed &= ~BSS_CHANGED_BEACON_ENABLED;
275 if (WARN_ON(changed & BSS_CHANGED_BEACON))
276 return;
277 break;
278 }
279
280 if (changed & BSS_CHANGED_BEACON_ENABLED) {
281 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
282 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
283 sdata->vif.bss_conf.enable_beacon = false;
284 } else {
285 /*
286 * Beacon should be enabled, but AP mode must
287 * check whether there is a beacon configured.
288 */
289 switch (sdata->vif.type) {
290 case NL80211_IFTYPE_AP:
291 sdata->vif.bss_conf.enable_beacon =
292 !!sdata->u.ap.beacon;
293 break;
294 case NL80211_IFTYPE_ADHOC:
295 sdata->vif.bss_conf.enable_beacon =
296 !!sdata->u.ibss.presp;
297 break;
298 #ifdef CONFIG_MAC80211_MESH
299 case NL80211_IFTYPE_MESH_POINT:
300 sdata->vif.bss_conf.enable_beacon =
301 !!sdata->u.mesh.mesh_id_len;
302 break;
303 #endif
304 default:
305 /* not reached */
306 WARN_ON(1);
307 break;
308 }
309 }
310 }
311
312 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
313 }
314
315 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
316 {
317 sdata->vif.bss_conf.use_cts_prot = false;
318 sdata->vif.bss_conf.use_short_preamble = false;
319 sdata->vif.bss_conf.use_short_slot = false;
320 return BSS_CHANGED_ERP_CTS_PROT |
321 BSS_CHANGED_ERP_PREAMBLE |
322 BSS_CHANGED_ERP_SLOT;
323 }
324
325 static void ieee80211_tasklet_handler(unsigned long data)
326 {
327 struct ieee80211_local *local = (struct ieee80211_local *) data;
328 struct sta_info *sta, *tmp;
329 struct skb_eosp_msg_data *eosp_data;
330 struct sk_buff *skb;
331
332 while ((skb = skb_dequeue(&local->skb_queue)) ||
333 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
334 switch (skb->pkt_type) {
335 case IEEE80211_RX_MSG:
336 /* Clear skb->pkt_type in order to not confuse kernel
337 * netstack. */
338 skb->pkt_type = 0;
339 ieee80211_rx(local_to_hw(local), skb);
340 break;
341 case IEEE80211_TX_STATUS_MSG:
342 skb->pkt_type = 0;
343 ieee80211_tx_status(local_to_hw(local), skb);
344 break;
345 case IEEE80211_EOSP_MSG:
346 eosp_data = (void *)skb->cb;
347 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
348 /* skip wrong virtual interface */
349 if (memcmp(eosp_data->iface,
350 sta->sdata->vif.addr, ETH_ALEN))
351 continue;
352 clear_sta_flag(sta, WLAN_STA_SP);
353 break;
354 }
355 dev_kfree_skb(skb);
356 break;
357 default:
358 WARN(1, "mac80211: Packet is of unknown type %d\n",
359 skb->pkt_type);
360 dev_kfree_skb(skb);
361 break;
362 }
363 }
364 }
365
366 static void ieee80211_restart_work(struct work_struct *work)
367 {
368 struct ieee80211_local *local =
369 container_of(work, struct ieee80211_local, restart_work);
370
371 /* wait for scan work complete */
372 flush_workqueue(local->workqueue);
373
374 mutex_lock(&local->mtx);
375 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
376 local->sched_scanning,
377 "%s called with hardware scan in progress\n", __func__);
378 mutex_unlock(&local->mtx);
379
380 rtnl_lock();
381 ieee80211_scan_cancel(local);
382 ieee80211_reconfig(local);
383 rtnl_unlock();
384 }
385
386 void ieee80211_restart_hw(struct ieee80211_hw *hw)
387 {
388 struct ieee80211_local *local = hw_to_local(hw);
389
390 trace_api_restart_hw(local);
391
392 wiphy_info(hw->wiphy,
393 "Hardware restart was requested\n");
394
395 /* use this reason, ieee80211_reconfig will unblock it */
396 ieee80211_stop_queues_by_reason(hw,
397 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
398
399 schedule_work(&local->restart_work);
400 }
401 EXPORT_SYMBOL(ieee80211_restart_hw);
402
403 static void ieee80211_recalc_smps_work(struct work_struct *work)
404 {
405 struct ieee80211_local *local =
406 container_of(work, struct ieee80211_local, recalc_smps);
407
408 mutex_lock(&local->iflist_mtx);
409 ieee80211_recalc_smps(local);
410 mutex_unlock(&local->iflist_mtx);
411 }
412
413 #ifdef CONFIG_INET
414 static int ieee80211_ifa_changed(struct notifier_block *nb,
415 unsigned long data, void *arg)
416 {
417 struct in_ifaddr *ifa = arg;
418 struct ieee80211_local *local =
419 container_of(nb, struct ieee80211_local,
420 ifa_notifier);
421 struct net_device *ndev = ifa->ifa_dev->dev;
422 struct wireless_dev *wdev = ndev->ieee80211_ptr;
423 struct in_device *idev;
424 struct ieee80211_sub_if_data *sdata;
425 struct ieee80211_bss_conf *bss_conf;
426 struct ieee80211_if_managed *ifmgd;
427 int c = 0;
428
429 /* Make sure it's our interface that got changed */
430 if (!wdev)
431 return NOTIFY_DONE;
432
433 if (wdev->wiphy != local->hw.wiphy)
434 return NOTIFY_DONE;
435
436 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
437 bss_conf = &sdata->vif.bss_conf;
438
439 if (!ieee80211_sdata_running(sdata))
440 return NOTIFY_DONE;
441
442 /* ARP filtering is only supported in managed mode */
443 if (sdata->vif.type != NL80211_IFTYPE_STATION)
444 return NOTIFY_DONE;
445
446 idev = __in_dev_get_rtnl(sdata->dev);
447 if (!idev)
448 return NOTIFY_DONE;
449
450 ifmgd = &sdata->u.mgd;
451 mutex_lock(&ifmgd->mtx);
452
453 /* Copy the addresses to the bss_conf list */
454 ifa = idev->ifa_list;
455 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
456 bss_conf->arp_addr_list[c] = ifa->ifa_address;
457 ifa = ifa->ifa_next;
458 c++;
459 }
460
461 /* If not all addresses fit the list, disable filtering */
462 if (ifa) {
463 sdata->arp_filter_state = false;
464 c = 0;
465 } else {
466 sdata->arp_filter_state = true;
467 }
468 bss_conf->arp_addr_cnt = c;
469
470 /* Configure driver only if associated */
471 if (ifmgd->associated) {
472 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
473 ieee80211_bss_info_change_notify(sdata,
474 BSS_CHANGED_ARP_FILTER);
475 }
476
477 mutex_unlock(&ifmgd->mtx);
478
479 return NOTIFY_DONE;
480 }
481 #endif
482
483 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
484 {
485 struct ieee80211_local *local =
486 container_of(napi, struct ieee80211_local, napi);
487
488 return local->ops->napi_poll(&local->hw, budget);
489 }
490
491 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
492 {
493 struct ieee80211_local *local = hw_to_local(hw);
494
495 napi_schedule(&local->napi);
496 }
497 EXPORT_SYMBOL(ieee80211_napi_schedule);
498
499 void ieee80211_napi_complete(struct ieee80211_hw *hw)
500 {
501 struct ieee80211_local *local = hw_to_local(hw);
502
503 napi_complete(&local->napi);
504 }
505 EXPORT_SYMBOL(ieee80211_napi_complete);
506
507 /* There isn't a lot of sense in it, but you can transmit anything you like */
508 static const struct ieee80211_txrx_stypes
509 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
510 [NL80211_IFTYPE_ADHOC] = {
511 .tx = 0xffff,
512 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
513 },
514 [NL80211_IFTYPE_STATION] = {
515 .tx = 0xffff,
516 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
517 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
518 },
519 [NL80211_IFTYPE_AP] = {
520 .tx = 0xffff,
521 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
522 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
523 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
524 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
525 BIT(IEEE80211_STYPE_AUTH >> 4) |
526 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
527 BIT(IEEE80211_STYPE_ACTION >> 4),
528 },
529 [NL80211_IFTYPE_AP_VLAN] = {
530 /* copy AP */
531 .tx = 0xffff,
532 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
533 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
534 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
535 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
536 BIT(IEEE80211_STYPE_AUTH >> 4) |
537 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
538 BIT(IEEE80211_STYPE_ACTION >> 4),
539 },
540 [NL80211_IFTYPE_P2P_CLIENT] = {
541 .tx = 0xffff,
542 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
543 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
544 },
545 [NL80211_IFTYPE_P2P_GO] = {
546 .tx = 0xffff,
547 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
548 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
549 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
550 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
551 BIT(IEEE80211_STYPE_AUTH >> 4) |
552 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
553 BIT(IEEE80211_STYPE_ACTION >> 4),
554 },
555 [NL80211_IFTYPE_MESH_POINT] = {
556 .tx = 0xffff,
557 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
558 BIT(IEEE80211_STYPE_AUTH >> 4) |
559 BIT(IEEE80211_STYPE_DEAUTH >> 4),
560 },
561 };
562
563 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
564 const struct ieee80211_ops *ops)
565 {
566 struct ieee80211_local *local;
567 int priv_size, i;
568 struct wiphy *wiphy;
569
570 /* Ensure 32-byte alignment of our private data and hw private data.
571 * We use the wiphy priv data for both our ieee80211_local and for
572 * the driver's private data
573 *
574 * In memory it'll be like this:
575 *
576 * +-------------------------+
577 * | struct wiphy |
578 * +-------------------------+
579 * | struct ieee80211_local |
580 * +-------------------------+
581 * | driver's private data |
582 * +-------------------------+
583 *
584 */
585 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
586
587 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
588
589 if (!wiphy)
590 return NULL;
591
592 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
593
594 wiphy->privid = mac80211_wiphy_privid;
595
596 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
597 WIPHY_FLAG_4ADDR_AP |
598 WIPHY_FLAG_4ADDR_STATION;
599
600 if (!ops->set_key)
601 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
602
603 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
604
605 local = wiphy_priv(wiphy);
606
607 local->hw.wiphy = wiphy;
608
609 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
610
611 BUG_ON(!ops->tx);
612 BUG_ON(!ops->start);
613 BUG_ON(!ops->stop);
614 BUG_ON(!ops->config);
615 BUG_ON(!ops->add_interface);
616 BUG_ON(!ops->remove_interface);
617 BUG_ON(!ops->configure_filter);
618 local->ops = ops;
619
620 /* set up some defaults */
621 local->hw.queues = 1;
622 local->hw.max_rates = 1;
623 local->hw.max_report_rates = 0;
624 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
625 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
626 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
627 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
628 local->user_power_level = -1;
629 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
630 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
631
632 INIT_LIST_HEAD(&local->interfaces);
633
634 __hw_addr_init(&local->mc_list);
635
636 mutex_init(&local->iflist_mtx);
637 mutex_init(&local->mtx);
638
639 mutex_init(&local->key_mtx);
640 spin_lock_init(&local->filter_lock);
641 spin_lock_init(&local->queue_stop_reason_lock);
642
643 /*
644 * The rx_skb_queue is only accessed from tasklets,
645 * but other SKB queues are used from within IRQ
646 * context. Therefore, this one needs a different
647 * locking class so our direct, non-irq-safe use of
648 * the queue's lock doesn't throw lockdep warnings.
649 */
650 skb_queue_head_init_class(&local->rx_skb_queue,
651 &ieee80211_rx_skb_queue_class);
652
653 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
654
655 ieee80211_work_init(local);
656
657 INIT_WORK(&local->restart_work, ieee80211_restart_work);
658
659 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
660 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
661 local->smps_mode = IEEE80211_SMPS_OFF;
662
663 INIT_WORK(&local->dynamic_ps_enable_work,
664 ieee80211_dynamic_ps_enable_work);
665 INIT_WORK(&local->dynamic_ps_disable_work,
666 ieee80211_dynamic_ps_disable_work);
667 setup_timer(&local->dynamic_ps_timer,
668 ieee80211_dynamic_ps_timer, (unsigned long) local);
669
670 INIT_WORK(&local->sched_scan_stopped_work,
671 ieee80211_sched_scan_stopped_work);
672
673 sta_info_init(local);
674
675 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
676 skb_queue_head_init(&local->pending[i]);
677 atomic_set(&local->agg_queue_stop[i], 0);
678 }
679 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
680 (unsigned long)local);
681
682 tasklet_init(&local->tasklet,
683 ieee80211_tasklet_handler,
684 (unsigned long) local);
685
686 skb_queue_head_init(&local->skb_queue);
687 skb_queue_head_init(&local->skb_queue_unreliable);
688
689 /* init dummy netdev for use w/ NAPI */
690 init_dummy_netdev(&local->napi_dev);
691
692 ieee80211_led_names(local);
693
694 ieee80211_hw_roc_setup(local);
695
696 return local_to_hw(local);
697 }
698 EXPORT_SYMBOL(ieee80211_alloc_hw);
699
700 int ieee80211_register_hw(struct ieee80211_hw *hw)
701 {
702 struct ieee80211_local *local = hw_to_local(hw);
703 int result, i;
704 enum ieee80211_band band;
705 int channels, max_bitrates;
706 bool supp_ht;
707 static const u32 cipher_suites[] = {
708 /* keep WEP first, it may be removed below */
709 WLAN_CIPHER_SUITE_WEP40,
710 WLAN_CIPHER_SUITE_WEP104,
711 WLAN_CIPHER_SUITE_TKIP,
712 WLAN_CIPHER_SUITE_CCMP,
713
714 /* keep last -- depends on hw flags! */
715 WLAN_CIPHER_SUITE_AES_CMAC
716 };
717
718 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
719 #ifdef CONFIG_PM
720 && (!local->ops->suspend || !local->ops->resume)
721 #endif
722 )
723 return -EINVAL;
724
725 if (hw->max_report_rates == 0)
726 hw->max_report_rates = hw->max_rates;
727
728 /*
729 * generic code guarantees at least one band,
730 * set this very early because much code assumes
731 * that hw.conf.channel is assigned
732 */
733 channels = 0;
734 max_bitrates = 0;
735 supp_ht = false;
736 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
737 struct ieee80211_supported_band *sband;
738
739 sband = local->hw.wiphy->bands[band];
740 if (!sband)
741 continue;
742 if (!local->oper_channel) {
743 /* init channel we're on */
744 local->hw.conf.channel =
745 local->oper_channel = &sband->channels[0];
746 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
747 }
748 channels += sband->n_channels;
749
750 if (max_bitrates < sband->n_bitrates)
751 max_bitrates = sband->n_bitrates;
752 supp_ht = supp_ht || sband->ht_cap.ht_supported;
753 }
754
755 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
756 sizeof(void *) * channels, GFP_KERNEL);
757 if (!local->int_scan_req)
758 return -ENOMEM;
759
760 /* if low-level driver supports AP, we also support VLAN */
761 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
762 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
763 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
764 }
765
766 /* mac80211 always supports monitor */
767 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
768 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
769
770 /*
771 * mac80211 doesn't support more than 1 channel, and also not more
772 * than one IBSS interface
773 */
774 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
775 const struct ieee80211_iface_combination *c;
776 int j;
777
778 c = &hw->wiphy->iface_combinations[i];
779
780 if (c->num_different_channels > 1)
781 return -EINVAL;
782
783 for (j = 0; j < c->n_limits; j++)
784 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
785 c->limits[j].max > 1)
786 return -EINVAL;
787 }
788
789 #ifndef CONFIG_MAC80211_MESH
790 /* mesh depends on Kconfig, but drivers should set it if they want */
791 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
792 #endif
793
794 /* if the underlying driver supports mesh, mac80211 will (at least)
795 * provide routing of mesh authentication frames to userspace */
796 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
797 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
798
799 /* mac80211 supports control port protocol changing */
800 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
801
802 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
803 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
804 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
805 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
806
807 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
808 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
809 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
810
811 /*
812 * Calculate scan IE length -- we need this to alloc
813 * memory and to subtract from the driver limit. It
814 * includes the DS Params, (extended) supported rates, and HT
815 * information -- SSID is the driver's responsibility.
816 */
817 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
818 3 /* DS Params */;
819 if (supp_ht)
820 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
821
822 if (!local->ops->hw_scan) {
823 /* For hw_scan, driver needs to set these up. */
824 local->hw.wiphy->max_scan_ssids = 4;
825 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
826 }
827
828 /*
829 * If the driver supports any scan IEs, then assume the
830 * limit includes the IEs mac80211 will add, otherwise
831 * leave it at zero and let the driver sort it out; we
832 * still pass our IEs to the driver but userspace will
833 * not be allowed to in that case.
834 */
835 if (local->hw.wiphy->max_scan_ie_len)
836 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
837
838 /* Set up cipher suites unless driver already did */
839 if (!local->hw.wiphy->cipher_suites) {
840 local->hw.wiphy->cipher_suites = cipher_suites;
841 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
842 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
843 local->hw.wiphy->n_cipher_suites--;
844 }
845 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
846 if (local->hw.wiphy->cipher_suites == cipher_suites) {
847 local->hw.wiphy->cipher_suites += 2;
848 local->hw.wiphy->n_cipher_suites -= 2;
849 } else {
850 u32 *suites;
851 int r, w = 0;
852
853 /* Filter out WEP */
854
855 suites = kmemdup(
856 local->hw.wiphy->cipher_suites,
857 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
858 GFP_KERNEL);
859 if (!suites)
860 return -ENOMEM;
861 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
862 u32 suite = local->hw.wiphy->cipher_suites[r];
863 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
864 suite == WLAN_CIPHER_SUITE_WEP104)
865 continue;
866 suites[w++] = suite;
867 }
868 local->hw.wiphy->cipher_suites = suites;
869 local->hw.wiphy->n_cipher_suites = w;
870 local->wiphy_ciphers_allocated = true;
871 }
872 }
873
874 if (!local->ops->remain_on_channel)
875 local->hw.wiphy->max_remain_on_channel_duration = 5000;
876
877 if (local->ops->sched_scan_start)
878 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
879
880 /* mac80211 based drivers don't support internal TDLS setup */
881 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
882 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
883
884 result = wiphy_register(local->hw.wiphy);
885 if (result < 0)
886 goto fail_wiphy_register;
887
888 /*
889 * We use the number of queues for feature tests (QoS, HT) internally
890 * so restrict them appropriately.
891 */
892 if (hw->queues > IEEE80211_MAX_QUEUES)
893 hw->queues = IEEE80211_MAX_QUEUES;
894
895 local->workqueue =
896 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
897 if (!local->workqueue) {
898 result = -ENOMEM;
899 goto fail_workqueue;
900 }
901
902 /*
903 * The hardware needs headroom for sending the frame,
904 * and we need some headroom for passing the frame to monitor
905 * interfaces, but never both at the same time.
906 */
907 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
908 IEEE80211_TX_STATUS_HEADROOM);
909
910 debugfs_hw_add(local);
911
912 /*
913 * if the driver doesn't specify a max listen interval we
914 * use 5 which should be a safe default
915 */
916 if (local->hw.max_listen_interval == 0)
917 local->hw.max_listen_interval = 5;
918
919 local->hw.conf.listen_interval = local->hw.max_listen_interval;
920
921 local->dynamic_ps_forced_timeout = -1;
922
923 result = ieee80211_wep_init(local);
924 if (result < 0)
925 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
926 result);
927
928 rtnl_lock();
929
930 result = ieee80211_init_rate_ctrl_alg(local,
931 hw->rate_control_algorithm);
932 if (result < 0) {
933 wiphy_debug(local->hw.wiphy,
934 "Failed to initialize rate control algorithm\n");
935 goto fail_rate;
936 }
937
938 /* add one default STA interface if supported */
939 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
940 result = ieee80211_if_add(local, "wlan%d", NULL,
941 NL80211_IFTYPE_STATION, NULL);
942 if (result)
943 wiphy_warn(local->hw.wiphy,
944 "Failed to add default virtual iface\n");
945 }
946
947 rtnl_unlock();
948
949 ieee80211_led_init(local);
950
951 local->network_latency_notifier.notifier_call =
952 ieee80211_max_network_latency;
953 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
954 &local->network_latency_notifier);
955 if (result) {
956 rtnl_lock();
957 goto fail_pm_qos;
958 }
959
960 #ifdef CONFIG_INET
961 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
962 result = register_inetaddr_notifier(&local->ifa_notifier);
963 if (result)
964 goto fail_ifa;
965 #endif
966
967 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
968 local->hw.napi_weight);
969
970 return 0;
971
972 #ifdef CONFIG_INET
973 fail_ifa:
974 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
975 &local->network_latency_notifier);
976 rtnl_lock();
977 #endif
978 fail_pm_qos:
979 ieee80211_led_exit(local);
980 ieee80211_remove_interfaces(local);
981 fail_rate:
982 rtnl_unlock();
983 ieee80211_wep_free(local);
984 sta_info_stop(local);
985 destroy_workqueue(local->workqueue);
986 fail_workqueue:
987 wiphy_unregister(local->hw.wiphy);
988 fail_wiphy_register:
989 if (local->wiphy_ciphers_allocated)
990 kfree(local->hw.wiphy->cipher_suites);
991 kfree(local->int_scan_req);
992 return result;
993 }
994 EXPORT_SYMBOL(ieee80211_register_hw);
995
996 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
997 {
998 struct ieee80211_local *local = hw_to_local(hw);
999
1000 tasklet_kill(&local->tx_pending_tasklet);
1001 tasklet_kill(&local->tasklet);
1002
1003 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1004 &local->network_latency_notifier);
1005 #ifdef CONFIG_INET
1006 unregister_inetaddr_notifier(&local->ifa_notifier);
1007 #endif
1008
1009 rtnl_lock();
1010
1011 /*
1012 * At this point, interface list manipulations are fine
1013 * because the driver cannot be handing us frames any
1014 * more and the tasklet is killed.
1015 */
1016 ieee80211_remove_interfaces(local);
1017
1018 rtnl_unlock();
1019
1020 /*
1021 * Now all work items will be gone, but the
1022 * timer might still be armed, so delete it
1023 */
1024 del_timer_sync(&local->work_timer);
1025
1026 cancel_work_sync(&local->restart_work);
1027 cancel_work_sync(&local->reconfig_filter);
1028
1029 ieee80211_clear_tx_pending(local);
1030 rate_control_deinitialize(local);
1031
1032 if (skb_queue_len(&local->skb_queue) ||
1033 skb_queue_len(&local->skb_queue_unreliable))
1034 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1035 skb_queue_purge(&local->skb_queue);
1036 skb_queue_purge(&local->skb_queue_unreliable);
1037 skb_queue_purge(&local->rx_skb_queue);
1038
1039 destroy_workqueue(local->workqueue);
1040 wiphy_unregister(local->hw.wiphy);
1041 sta_info_stop(local);
1042 ieee80211_wep_free(local);
1043 ieee80211_led_exit(local);
1044 kfree(local->int_scan_req);
1045 }
1046 EXPORT_SYMBOL(ieee80211_unregister_hw);
1047
1048 void ieee80211_free_hw(struct ieee80211_hw *hw)
1049 {
1050 struct ieee80211_local *local = hw_to_local(hw);
1051
1052 mutex_destroy(&local->iflist_mtx);
1053 mutex_destroy(&local->mtx);
1054
1055 if (local->wiphy_ciphers_allocated)
1056 kfree(local->hw.wiphy->cipher_suites);
1057
1058 wiphy_free(local->hw.wiphy);
1059 }
1060 EXPORT_SYMBOL(ieee80211_free_hw);
1061
1062 static int __init ieee80211_init(void)
1063 {
1064 struct sk_buff *skb;
1065 int ret;
1066
1067 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1068 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1069 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1070
1071 ret = rc80211_minstrel_init();
1072 if (ret)
1073 return ret;
1074
1075 ret = rc80211_minstrel_ht_init();
1076 if (ret)
1077 goto err_minstrel;
1078
1079 ret = rc80211_pid_init();
1080 if (ret)
1081 goto err_pid;
1082
1083 ret = ieee80211_iface_init();
1084 if (ret)
1085 goto err_netdev;
1086
1087 return 0;
1088 err_netdev:
1089 rc80211_pid_exit();
1090 err_pid:
1091 rc80211_minstrel_ht_exit();
1092 err_minstrel:
1093 rc80211_minstrel_exit();
1094
1095 return ret;
1096 }
1097
1098 static void __exit ieee80211_exit(void)
1099 {
1100 rc80211_pid_exit();
1101 rc80211_minstrel_ht_exit();
1102 rc80211_minstrel_exit();
1103
1104 if (mesh_allocated)
1105 ieee80211s_stop();
1106
1107 ieee80211_iface_exit();
1108
1109 rcu_barrier();
1110 }
1111
1112
1113 subsys_initcall(ieee80211_init);
1114 module_exit(ieee80211_exit);
1115
1116 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1117 MODULE_LICENSE("GPL");