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[linux-2.6/next.git] / net / mac80211 / main.c
blob866f269183cf9a1532f317e3b9f52bc437a98213
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 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 sk_buff *skb;
329
330 while ((skb = skb_dequeue(&local->skb_queue)) ||
331 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332 switch (skb->pkt_type) {
333 case IEEE80211_RX_MSG:
334 /* Clear skb->pkt_type in order to not confuse kernel
335 * netstack. */
336 skb->pkt_type = 0;
337 ieee80211_rx(local_to_hw(local), skb);
338 break;
339 case IEEE80211_TX_STATUS_MSG:
340 skb->pkt_type = 0;
341 ieee80211_tx_status(local_to_hw(local), skb);
342 break;
343 default:
344 WARN(1, "mac80211: Packet is of unknown type %d\n",
345 skb->pkt_type);
346 dev_kfree_skb(skb);
347 break;
348 }
349 }
350 }
351
352 static void ieee80211_restart_work(struct work_struct *work)
353 {
354 struct ieee80211_local *local =
355 container_of(work, struct ieee80211_local, restart_work);
356
357 /* wait for scan work complete */
358 flush_workqueue(local->workqueue);
359
360 mutex_lock(&local->mtx);
361 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
362 local->sched_scanning,
363 "%s called with hardware scan in progress\n", __func__);
364 mutex_unlock(&local->mtx);
365
366 rtnl_lock();
367 ieee80211_scan_cancel(local);
368 ieee80211_reconfig(local);
369 rtnl_unlock();
370 }
371
372 void ieee80211_restart_hw(struct ieee80211_hw *hw)
373 {
374 struct ieee80211_local *local = hw_to_local(hw);
375
376 trace_api_restart_hw(local);
377
378 wiphy_info(hw->wiphy,
379 "Hardware restart was requested\n");
380
381 /* use this reason, ieee80211_reconfig will unblock it */
382 ieee80211_stop_queues_by_reason(hw,
383 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
384
385 schedule_work(&local->restart_work);
386 }
387 EXPORT_SYMBOL(ieee80211_restart_hw);
388
389 static void ieee80211_recalc_smps_work(struct work_struct *work)
390 {
391 struct ieee80211_local *local =
392 container_of(work, struct ieee80211_local, recalc_smps);
393
394 mutex_lock(&local->iflist_mtx);
395 ieee80211_recalc_smps(local);
396 mutex_unlock(&local->iflist_mtx);
397 }
398
399 #ifdef CONFIG_INET
400 static int ieee80211_ifa_changed(struct notifier_block *nb,
401 unsigned long data, void *arg)
402 {
403 struct in_ifaddr *ifa = arg;
404 struct ieee80211_local *local =
405 container_of(nb, struct ieee80211_local,
406 ifa_notifier);
407 struct net_device *ndev = ifa->ifa_dev->dev;
408 struct wireless_dev *wdev = ndev->ieee80211_ptr;
409 struct in_device *idev;
410 struct ieee80211_sub_if_data *sdata;
411 struct ieee80211_bss_conf *bss_conf;
412 struct ieee80211_if_managed *ifmgd;
413 int c = 0;
414
415 /* Make sure it's our interface that got changed */
416 if (!wdev)
417 return NOTIFY_DONE;
418
419 if (wdev->wiphy != local->hw.wiphy)
420 return NOTIFY_DONE;
421
422 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
423 bss_conf = &sdata->vif.bss_conf;
424
425 if (!ieee80211_sdata_running(sdata))
426 return NOTIFY_DONE;
427
428 /* ARP filtering is only supported in managed mode */
429 if (sdata->vif.type != NL80211_IFTYPE_STATION)
430 return NOTIFY_DONE;
431
432 idev = __in_dev_get_rtnl(sdata->dev);
433 if (!idev)
434 return NOTIFY_DONE;
435
436 ifmgd = &sdata->u.mgd;
437 mutex_lock(&ifmgd->mtx);
438
439 /* Copy the addresses to the bss_conf list */
440 ifa = idev->ifa_list;
441 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
442 bss_conf->arp_addr_list[c] = ifa->ifa_address;
443 ifa = ifa->ifa_next;
444 c++;
445 }
446
447 /* If not all addresses fit the list, disable filtering */
448 if (ifa) {
449 sdata->arp_filter_state = false;
450 c = 0;
451 } else {
452 sdata->arp_filter_state = true;
453 }
454 bss_conf->arp_addr_cnt = c;
455
456 /* Configure driver only if associated */
457 if (ifmgd->associated) {
458 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
459 ieee80211_bss_info_change_notify(sdata,
460 BSS_CHANGED_ARP_FILTER);
461 }
462
463 mutex_unlock(&ifmgd->mtx);
464
465 return NOTIFY_DONE;
466 }
467 #endif
468
469 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
470 {
471 struct ieee80211_local *local =
472 container_of(napi, struct ieee80211_local, napi);
473
474 return local->ops->napi_poll(&local->hw, budget);
475 }
476
477 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
478 {
479 struct ieee80211_local *local = hw_to_local(hw);
480
481 napi_schedule(&local->napi);
482 }
483 EXPORT_SYMBOL(ieee80211_napi_schedule);
484
485 void ieee80211_napi_complete(struct ieee80211_hw *hw)
486 {
487 struct ieee80211_local *local = hw_to_local(hw);
488
489 napi_complete(&local->napi);
490 }
491 EXPORT_SYMBOL(ieee80211_napi_complete);
492
493 /* There isn't a lot of sense in it, but you can transmit anything you like */
494 static const struct ieee80211_txrx_stypes
495 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
496 [NL80211_IFTYPE_ADHOC] = {
497 .tx = 0xffff,
498 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
499 },
500 [NL80211_IFTYPE_STATION] = {
501 .tx = 0xffff,
502 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
503 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
504 },
505 [NL80211_IFTYPE_AP] = {
506 .tx = 0xffff,
507 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
508 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
509 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
510 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
511 BIT(IEEE80211_STYPE_AUTH >> 4) |
512 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
513 BIT(IEEE80211_STYPE_ACTION >> 4),
514 },
515 [NL80211_IFTYPE_AP_VLAN] = {
516 /* copy AP */
517 .tx = 0xffff,
518 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
519 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
520 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
521 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
522 BIT(IEEE80211_STYPE_AUTH >> 4) |
523 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
524 BIT(IEEE80211_STYPE_ACTION >> 4),
525 },
526 [NL80211_IFTYPE_P2P_CLIENT] = {
527 .tx = 0xffff,
528 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
529 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
530 },
531 [NL80211_IFTYPE_P2P_GO] = {
532 .tx = 0xffff,
533 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
534 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
535 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
536 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
537 BIT(IEEE80211_STYPE_AUTH >> 4) |
538 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
539 BIT(IEEE80211_STYPE_ACTION >> 4),
540 },
541 [NL80211_IFTYPE_MESH_POINT] = {
542 .tx = 0xffff,
543 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
544 BIT(IEEE80211_STYPE_AUTH >> 4) |
545 BIT(IEEE80211_STYPE_DEAUTH >> 4),
546 },
547 };
548
549 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
550 const struct ieee80211_ops *ops)
551 {
552 struct ieee80211_local *local;
553 int priv_size, i;
554 struct wiphy *wiphy;
555
556 /* Ensure 32-byte alignment of our private data and hw private data.
557 * We use the wiphy priv data for both our ieee80211_local and for
558 * the driver's private data
559 *
560 * In memory it'll be like this:
561 *
562 * +-------------------------+
563 * | struct wiphy |
564 * +-------------------------+
565 * | struct ieee80211_local |
566 * +-------------------------+
567 * | driver's private data |
568 * +-------------------------+
569 *
570 */
571 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
572
573 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
574
575 if (!wiphy)
576 return NULL;
577
578 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
579
580 wiphy->privid = mac80211_wiphy_privid;
581
582 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
583 WIPHY_FLAG_4ADDR_AP |
584 WIPHY_FLAG_4ADDR_STATION;
585
586 if (!ops->set_key)
587 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
588
589 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
590
591 local = wiphy_priv(wiphy);
592
593 local->hw.wiphy = wiphy;
594
595 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
596
597 BUG_ON(!ops->tx);
598 BUG_ON(!ops->start);
599 BUG_ON(!ops->stop);
600 BUG_ON(!ops->config);
601 BUG_ON(!ops->add_interface);
602 BUG_ON(!ops->remove_interface);
603 BUG_ON(!ops->configure_filter);
604 local->ops = ops;
605
606 /* set up some defaults */
607 local->hw.queues = 1;
608 local->hw.max_rates = 1;
609 local->hw.max_report_rates = 0;
610 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
611 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
612 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
613 local->user_power_level = -1;
614 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
615 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
616
617 INIT_LIST_HEAD(&local->interfaces);
618
619 __hw_addr_init(&local->mc_list);
620
621 mutex_init(&local->iflist_mtx);
622 mutex_init(&local->mtx);
623
624 mutex_init(&local->key_mtx);
625 spin_lock_init(&local->filter_lock);
626 spin_lock_init(&local->queue_stop_reason_lock);
627
628 /*
629 * The rx_skb_queue is only accessed from tasklets,
630 * but other SKB queues are used from within IRQ
631 * context. Therefore, this one needs a different
632 * locking class so our direct, non-irq-safe use of
633 * the queue's lock doesn't throw lockdep warnings.
634 */
635 skb_queue_head_init_class(&local->rx_skb_queue,
636 &ieee80211_rx_skb_queue_class);
637
638 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
639
640 ieee80211_work_init(local);
641
642 INIT_WORK(&local->restart_work, ieee80211_restart_work);
643
644 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
645 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
646 local->smps_mode = IEEE80211_SMPS_OFF;
647
648 INIT_WORK(&local->dynamic_ps_enable_work,
649 ieee80211_dynamic_ps_enable_work);
650 INIT_WORK(&local->dynamic_ps_disable_work,
651 ieee80211_dynamic_ps_disable_work);
652 setup_timer(&local->dynamic_ps_timer,
653 ieee80211_dynamic_ps_timer, (unsigned long) local);
654
655 INIT_WORK(&local->sched_scan_stopped_work,
656 ieee80211_sched_scan_stopped_work);
657
658 sta_info_init(local);
659
660 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
661 skb_queue_head_init(&local->pending[i]);
662 atomic_set(&local->agg_queue_stop[i], 0);
663 }
664 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
665 (unsigned long)local);
666
667 tasklet_init(&local->tasklet,
668 ieee80211_tasklet_handler,
669 (unsigned long) local);
670
671 skb_queue_head_init(&local->skb_queue);
672 skb_queue_head_init(&local->skb_queue_unreliable);
673
674 /* init dummy netdev for use w/ NAPI */
675 init_dummy_netdev(&local->napi_dev);
676
677 ieee80211_led_names(local);
678
679 ieee80211_hw_roc_setup(local);
680
681 return local_to_hw(local);
682 }
683 EXPORT_SYMBOL(ieee80211_alloc_hw);
684
685 int ieee80211_register_hw(struct ieee80211_hw *hw)
686 {
687 struct ieee80211_local *local = hw_to_local(hw);
688 int result, i;
689 enum ieee80211_band band;
690 int channels, max_bitrates;
691 bool supp_ht;
692 static const u32 cipher_suites[] = {
693 /* keep WEP first, it may be removed below */
694 WLAN_CIPHER_SUITE_WEP40,
695 WLAN_CIPHER_SUITE_WEP104,
696 WLAN_CIPHER_SUITE_TKIP,
697 WLAN_CIPHER_SUITE_CCMP,
698
699 /* keep last -- depends on hw flags! */
700 WLAN_CIPHER_SUITE_AES_CMAC
701 };
702
703 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
704 #ifdef CONFIG_PM
705 && (!local->ops->suspend || !local->ops->resume)
706 #endif
707 )
708 return -EINVAL;
709
710 if (hw->max_report_rates == 0)
711 hw->max_report_rates = hw->max_rates;
712
713 /*
714 * generic code guarantees at least one band,
715 * set this very early because much code assumes
716 * that hw.conf.channel is assigned
717 */
718 channels = 0;
719 max_bitrates = 0;
720 supp_ht = false;
721 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
722 struct ieee80211_supported_band *sband;
723
724 sband = local->hw.wiphy->bands[band];
725 if (!sband)
726 continue;
727 if (!local->oper_channel) {
728 /* init channel we're on */
729 local->hw.conf.channel =
730 local->oper_channel = &sband->channels[0];
731 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
732 }
733 channels += sband->n_channels;
734
735 if (max_bitrates < sband->n_bitrates)
736 max_bitrates = sband->n_bitrates;
737 supp_ht = supp_ht || sband->ht_cap.ht_supported;
738 }
739
740 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
741 sizeof(void *) * channels, GFP_KERNEL);
742 if (!local->int_scan_req)
743 return -ENOMEM;
744
745 /* if low-level driver supports AP, we also support VLAN */
746 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
747 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
748 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
749 }
750
751 /* mac80211 always supports monitor */
752 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
753 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
754
755 /*
756 * mac80211 doesn't support more than 1 channel, and also not more
757 * than one IBSS interface
758 */
759 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
760 const struct ieee80211_iface_combination *c;
761 int j;
762
763 c = &hw->wiphy->iface_combinations[i];
764
765 if (c->num_different_channels > 1)
766 return -EINVAL;
767
768 for (j = 0; j < c->n_limits; j++)
769 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
770 c->limits[j].max > 1)
771 return -EINVAL;
772 }
773
774 #ifndef CONFIG_MAC80211_MESH
775 /* mesh depends on Kconfig, but drivers should set it if they want */
776 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
777 #endif
778
779 /* if the underlying driver supports mesh, mac80211 will (at least)
780 * provide routing of mesh authentication frames to userspace */
781 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
782 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
783
784 /* mac80211 supports control port protocol changing */
785 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
786
787 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
788 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
789 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
790 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
791
792 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
793 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
794 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
795
796 /*
797 * Calculate scan IE length -- we need this to alloc
798 * memory and to subtract from the driver limit. It
799 * includes the DS Params, (extended) supported rates, and HT
800 * information -- SSID is the driver's responsibility.
801 */
802 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
803 3 /* DS Params */;
804 if (supp_ht)
805 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806
807 if (!local->ops->hw_scan) {
808 /* For hw_scan, driver needs to set these up. */
809 local->hw.wiphy->max_scan_ssids = 4;
810 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811 }
812
813 /*
814 * If the driver supports any scan IEs, then assume the
815 * limit includes the IEs mac80211 will add, otherwise
816 * leave it at zero and let the driver sort it out; we
817 * still pass our IEs to the driver but userspace will
818 * not be allowed to in that case.
819 */
820 if (local->hw.wiphy->max_scan_ie_len)
821 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822
823 /* Set up cipher suites unless driver already did */
824 if (!local->hw.wiphy->cipher_suites) {
825 local->hw.wiphy->cipher_suites = cipher_suites;
826 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
827 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
828 local->hw.wiphy->n_cipher_suites--;
829 }
830 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
831 if (local->hw.wiphy->cipher_suites == cipher_suites) {
832 local->hw.wiphy->cipher_suites += 2;
833 local->hw.wiphy->n_cipher_suites -= 2;
834 } else {
835 u32 *suites;
836 int r, w = 0;
837
838 /* Filter out WEP */
839
840 suites = kmemdup(
841 local->hw.wiphy->cipher_suites,
842 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
843 GFP_KERNEL);
844 if (!suites)
845 return -ENOMEM;
846 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
847 u32 suite = local->hw.wiphy->cipher_suites[r];
848 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
849 suite == WLAN_CIPHER_SUITE_WEP104)
850 continue;
851 suites[w++] = suite;
852 }
853 local->hw.wiphy->cipher_suites = suites;
854 local->hw.wiphy->n_cipher_suites = w;
855 local->wiphy_ciphers_allocated = true;
856 }
857 }
858
859 if (!local->ops->remain_on_channel)
860 local->hw.wiphy->max_remain_on_channel_duration = 5000;
861
862 if (local->ops->sched_scan_start)
863 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
864
865 result = wiphy_register(local->hw.wiphy);
866 if (result < 0)
867 goto fail_wiphy_register;
868
869 /*
870 * We use the number of queues for feature tests (QoS, HT) internally
871 * so restrict them appropriately.
872 */
873 if (hw->queues > IEEE80211_MAX_QUEUES)
874 hw->queues = IEEE80211_MAX_QUEUES;
875
876 local->workqueue =
877 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
878 if (!local->workqueue) {
879 result = -ENOMEM;
880 goto fail_workqueue;
881 }
882
883 /*
884 * The hardware needs headroom for sending the frame,
885 * and we need some headroom for passing the frame to monitor
886 * interfaces, but never both at the same time.
887 */
888 #ifndef __CHECKER__
889 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
890 sizeof(struct ieee80211_tx_status_rtap_hdr));
891 #endif
892 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893 sizeof(struct ieee80211_tx_status_rtap_hdr));
894
895 debugfs_hw_add(local);
896
897 /*
898 * if the driver doesn't specify a max listen interval we
899 * use 5 which should be a safe default
900 */
901 if (local->hw.max_listen_interval == 0)
902 local->hw.max_listen_interval = 5;
903
904 local->hw.conf.listen_interval = local->hw.max_listen_interval;
905
906 local->dynamic_ps_forced_timeout = -1;
907
908 result = ieee80211_wep_init(local);
909 if (result < 0)
910 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
911 result);
912
913 rtnl_lock();
914
915 result = ieee80211_init_rate_ctrl_alg(local,
916 hw->rate_control_algorithm);
917 if (result < 0) {
918 wiphy_debug(local->hw.wiphy,
919 "Failed to initialize rate control algorithm\n");
920 goto fail_rate;
921 }
922
923 /* add one default STA interface if supported */
924 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
925 result = ieee80211_if_add(local, "wlan%d", NULL,
926 NL80211_IFTYPE_STATION, NULL);
927 if (result)
928 wiphy_warn(local->hw.wiphy,
929 "Failed to add default virtual iface\n");
930 }
931
932 rtnl_unlock();
933
934 ieee80211_led_init(local);
935
936 local->network_latency_notifier.notifier_call =
937 ieee80211_max_network_latency;
938 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
939 &local->network_latency_notifier);
940 if (result) {
941 rtnl_lock();
942 goto fail_pm_qos;
943 }
944
945 #ifdef CONFIG_INET
946 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
947 result = register_inetaddr_notifier(&local->ifa_notifier);
948 if (result)
949 goto fail_ifa;
950 #endif
951
952 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
953 local->hw.napi_weight);
954
955 return 0;
956
957 #ifdef CONFIG_INET
958 fail_ifa:
959 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
960 &local->network_latency_notifier);
961 rtnl_lock();
962 #endif
963 fail_pm_qos:
964 ieee80211_led_exit(local);
965 ieee80211_remove_interfaces(local);
966 fail_rate:
967 rtnl_unlock();
968 ieee80211_wep_free(local);
969 sta_info_stop(local);
970 destroy_workqueue(local->workqueue);
971 fail_workqueue:
972 wiphy_unregister(local->hw.wiphy);
973 fail_wiphy_register:
974 if (local->wiphy_ciphers_allocated)
975 kfree(local->hw.wiphy->cipher_suites);
976 kfree(local->int_scan_req);
977 return result;
978 }
979 EXPORT_SYMBOL(ieee80211_register_hw);
980
981 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
982 {
983 struct ieee80211_local *local = hw_to_local(hw);
984
985 tasklet_kill(&local->tx_pending_tasklet);
986 tasklet_kill(&local->tasklet);
987
988 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
989 &local->network_latency_notifier);
990 #ifdef CONFIG_INET
991 unregister_inetaddr_notifier(&local->ifa_notifier);
992 #endif
993
994 rtnl_lock();
995
996 /*
997 * At this point, interface list manipulations are fine
998 * because the driver cannot be handing us frames any
999 * more and the tasklet is killed.
1000 */
1001 ieee80211_remove_interfaces(local);
1002
1003 rtnl_unlock();
1004
1005 /*
1006 * Now all work items will be gone, but the
1007 * timer might still be armed, so delete it
1008 */
1009 del_timer_sync(&local->work_timer);
1010
1011 cancel_work_sync(&local->restart_work);
1012 cancel_work_sync(&local->reconfig_filter);
1013
1014 ieee80211_clear_tx_pending(local);
1015 sta_info_stop(local);
1016 rate_control_deinitialize(local);
1017
1018 if (skb_queue_len(&local->skb_queue) ||
1019 skb_queue_len(&local->skb_queue_unreliable))
1020 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1021 skb_queue_purge(&local->skb_queue);
1022 skb_queue_purge(&local->skb_queue_unreliable);
1023 skb_queue_purge(&local->rx_skb_queue);
1024
1025 destroy_workqueue(local->workqueue);
1026 wiphy_unregister(local->hw.wiphy);
1027 ieee80211_wep_free(local);
1028 ieee80211_led_exit(local);
1029 kfree(local->int_scan_req);
1030 }
1031 EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033 void ieee80211_free_hw(struct ieee80211_hw *hw)
1034 {
1035 struct ieee80211_local *local = hw_to_local(hw);
1036
1037 mutex_destroy(&local->iflist_mtx);
1038 mutex_destroy(&local->mtx);
1039
1040 if (local->wiphy_ciphers_allocated)
1041 kfree(local->hw.wiphy->cipher_suites);
1042
1043 wiphy_free(local->hw.wiphy);
1044 }
1045 EXPORT_SYMBOL(ieee80211_free_hw);
1046
1047 static int __init ieee80211_init(void)
1048 {
1049 struct sk_buff *skb;
1050 int ret;
1051
1052 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1053 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1054 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1055
1056 ret = rc80211_minstrel_init();
1057 if (ret)
1058 return ret;
1059
1060 ret = rc80211_minstrel_ht_init();
1061 if (ret)
1062 goto err_minstrel;
1063
1064 ret = rc80211_pid_init();
1065 if (ret)
1066 goto err_pid;
1067
1068 ret = ieee80211_iface_init();
1069 if (ret)
1070 goto err_netdev;
1071
1072 return 0;
1073 err_netdev:
1074 rc80211_pid_exit();
1075 err_pid:
1076 rc80211_minstrel_ht_exit();
1077 err_minstrel:
1078 rc80211_minstrel_exit();
1079
1080 return ret;
1081 }
1082
1083 static void __exit ieee80211_exit(void)
1084 {
1085 rc80211_pid_exit();
1086 rc80211_minstrel_ht_exit();
1087 rc80211_minstrel_exit();
1088
1089 if (mesh_allocated)
1090 ieee80211s_stop();
1091
1092 ieee80211_iface_exit();
1093
1094 rcu_barrier();
1095 }
1096
1097
1098 subsys_initcall(ieee80211_init);
1099 module_exit(ieee80211_exit);
1100
1101 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1102 MODULE_LICENSE("GPL");
linux-next