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asm-generic: add linux/types.h to cmpxchg.h
[linux-2.6.git] / net / mac80211 / main.c
blobb581a24fa15c43739538ea8d4ae0b4a843feedce
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->hw, skb);
290 break;
291 case IEEE80211_TX_STATUS_MSG:
292 skb->pkt_type = 0;
293 ieee80211_tx_status(&local->hw, 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 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
599
600 INIT_LIST_HEAD(&local->interfaces);
601
602 __hw_addr_init(&local->mc_list);
603
604 mutex_init(&local->iflist_mtx);
605 mutex_init(&local->mtx);
606
607 mutex_init(&local->key_mtx);
608 spin_lock_init(&local->filter_lock);
609 spin_lock_init(&local->queue_stop_reason_lock);
610
611 /*
612 * The rx_skb_queue is only accessed from tasklets,
613 * but other SKB queues are used from within IRQ
614 * context. Therefore, this one needs a different
615 * locking class so our direct, non-irq-safe use of
616 * the queue's lock doesn't throw lockdep warnings.
617 */
618 skb_queue_head_init_class(&local->rx_skb_queue,
619 &ieee80211_rx_skb_queue_class);
620
621 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
622
623 ieee80211_work_init(local);
624
625 INIT_WORK(&local->restart_work, ieee80211_restart_work);
626
627 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
628 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
629 local->smps_mode = IEEE80211_SMPS_OFF;
630
631 INIT_WORK(&local->dynamic_ps_enable_work,
632 ieee80211_dynamic_ps_enable_work);
633 INIT_WORK(&local->dynamic_ps_disable_work,
634 ieee80211_dynamic_ps_disable_work);
635 setup_timer(&local->dynamic_ps_timer,
636 ieee80211_dynamic_ps_timer, (unsigned long) local);
637
638 INIT_WORK(&local->sched_scan_stopped_work,
639 ieee80211_sched_scan_stopped_work);
640
641 spin_lock_init(&local->ack_status_lock);
642 idr_init(&local->ack_status_frames);
643 /* preallocate at least one entry */
644 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
645
646 sta_info_init(local);
647
648 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
649 skb_queue_head_init(&local->pending[i]);
650 atomic_set(&local->agg_queue_stop[i], 0);
651 }
652 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
653 (unsigned long)local);
654
655 tasklet_init(&local->tasklet,
656 ieee80211_tasklet_handler,
657 (unsigned long) local);
658
659 skb_queue_head_init(&local->skb_queue);
660 skb_queue_head_init(&local->skb_queue_unreliable);
661
662 /* init dummy netdev for use w/ NAPI */
663 init_dummy_netdev(&local->napi_dev);
664
665 ieee80211_led_names(local);
666
667 ieee80211_hw_roc_setup(local);
668
669 return &local->hw;
670 }
671 EXPORT_SYMBOL(ieee80211_alloc_hw);
672
673 int ieee80211_register_hw(struct ieee80211_hw *hw)
674 {
675 struct ieee80211_local *local = hw_to_local(hw);
676 int result, i;
677 enum ieee80211_band band;
678 int channels, max_bitrates;
679 bool supp_ht;
680 static const u32 cipher_suites[] = {
681 /* keep WEP first, it may be removed below */
682 WLAN_CIPHER_SUITE_WEP40,
683 WLAN_CIPHER_SUITE_WEP104,
684 WLAN_CIPHER_SUITE_TKIP,
685 WLAN_CIPHER_SUITE_CCMP,
686
687 /* keep last -- depends on hw flags! */
688 WLAN_CIPHER_SUITE_AES_CMAC
689 };
690
691 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
692 #ifdef CONFIG_PM
693 && (!local->ops->suspend || !local->ops->resume)
694 #endif
695 )
696 return -EINVAL;
697
698 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
699 return -EINVAL;
700
701 if (hw->max_report_rates == 0)
702 hw->max_report_rates = hw->max_rates;
703
704 /*
705 * generic code guarantees at least one band,
706 * set this very early because much code assumes
707 * that hw.conf.channel is assigned
708 */
709 channels = 0;
710 max_bitrates = 0;
711 supp_ht = false;
712 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
713 struct ieee80211_supported_band *sband;
714
715 sband = local->hw.wiphy->bands[band];
716 if (!sband)
717 continue;
718 if (!local->oper_channel) {
719 /* init channel we're on */
720 local->hw.conf.channel =
721 local->oper_channel = &sband->channels[0];
722 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
723 }
724 channels += sband->n_channels;
725
726 if (max_bitrates < sband->n_bitrates)
727 max_bitrates = sband->n_bitrates;
728 supp_ht = supp_ht || sband->ht_cap.ht_supported;
729 }
730
731 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
732 sizeof(void *) * channels, GFP_KERNEL);
733 if (!local->int_scan_req)
734 return -ENOMEM;
735
736 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
737 if (!local->hw.wiphy->bands[band])
738 continue;
739 local->int_scan_req->rates[band] = (u32) -1;
740 }
741
742 /* if low-level driver supports AP, we also support VLAN */
743 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
744 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
745 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
746 }
747
748 /* mac80211 always supports monitor */
749 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
750 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
751
752 /*
753 * mac80211 doesn't support more than 1 channel, and also not more
754 * than one IBSS interface
755 */
756 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
757 const struct ieee80211_iface_combination *c;
758 int j;
759
760 c = &hw->wiphy->iface_combinations[i];
761
762 if (c->num_different_channels > 1)
763 return -EINVAL;
764
765 for (j = 0; j < c->n_limits; j++)
766 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
767 c->limits[j].max > 1)
768 return -EINVAL;
769 }
770
771 #ifndef CONFIG_MAC80211_MESH
772 /* mesh depends on Kconfig, but drivers should set it if they want */
773 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
774 #endif
775
776 /* if the underlying driver supports mesh, mac80211 will (at least)
777 * provide routing of mesh authentication frames to userspace */
778 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
779 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
780
781 /* mac80211 supports control port protocol changing */
782 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
783
784 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
785 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
786 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
787 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
788
789 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
790 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
791 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
792
793 /*
794 * Calculate scan IE length -- we need this to alloc
795 * memory and to subtract from the driver limit. It
796 * includes the DS Params, (extended) supported rates, and HT
797 * information -- SSID is the driver's responsibility.
798 */
799 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
800 3 /* DS Params */;
801 if (supp_ht)
802 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
803
804 if (!local->ops->hw_scan) {
805 /* For hw_scan, driver needs to set these up. */
806 local->hw.wiphy->max_scan_ssids = 4;
807 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
808 }
809
810 /*
811 * If the driver supports any scan IEs, then assume the
812 * limit includes the IEs mac80211 will add, otherwise
813 * leave it at zero and let the driver sort it out; we
814 * still pass our IEs to the driver but userspace will
815 * not be allowed to in that case.
816 */
817 if (local->hw.wiphy->max_scan_ie_len)
818 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
819
820 /* Set up cipher suites unless driver already did */
821 if (!local->hw.wiphy->cipher_suites) {
822 local->hw.wiphy->cipher_suites = cipher_suites;
823 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
824 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
825 local->hw.wiphy->n_cipher_suites--;
826 }
827 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
828 if (local->hw.wiphy->cipher_suites == cipher_suites) {
829 local->hw.wiphy->cipher_suites += 2;
830 local->hw.wiphy->n_cipher_suites -= 2;
831 } else {
832 u32 *suites;
833 int r, w = 0;
834
835 /* Filter out WEP */
836
837 suites = kmemdup(
838 local->hw.wiphy->cipher_suites,
839 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
840 GFP_KERNEL);
841 if (!suites)
842 return -ENOMEM;
843 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
844 u32 suite = local->hw.wiphy->cipher_suites[r];
845 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
846 suite == WLAN_CIPHER_SUITE_WEP104)
847 continue;
848 suites[w++] = suite;
849 }
850 local->hw.wiphy->cipher_suites = suites;
851 local->hw.wiphy->n_cipher_suites = w;
852 local->wiphy_ciphers_allocated = true;
853 }
854 }
855
856 if (!local->ops->remain_on_channel)
857 local->hw.wiphy->max_remain_on_channel_duration = 5000;
858
859 if (local->ops->sched_scan_start)
860 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
861
862 /* mac80211 based drivers don't support internal TDLS setup */
863 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
864 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
865
866 result = wiphy_register(local->hw.wiphy);
867 if (result < 0)
868 goto fail_wiphy_register;
869
870 /*
871 * We use the number of queues for feature tests (QoS, HT) internally
872 * so restrict them appropriately.
873 */
874 if (hw->queues > IEEE80211_MAX_QUEUES)
875 hw->queues = IEEE80211_MAX_QUEUES;
876
877 local->workqueue =
878 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
879 if (!local->workqueue) {
880 result = -ENOMEM;
881 goto fail_workqueue;
882 }
883
884 /*
885 * The hardware needs headroom for sending the frame,
886 * and we need some headroom for passing the frame to monitor
887 * interfaces, but never both at the same time.
888 */
889 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
890 IEEE80211_TX_STATUS_HEADROOM);
891
892 debugfs_hw_add(local);
893
894 /*
895 * if the driver doesn't specify a max listen interval we
896 * use 5 which should be a safe default
897 */
898 if (local->hw.max_listen_interval == 0)
899 local->hw.max_listen_interval = 5;
900
901 local->hw.conf.listen_interval = local->hw.max_listen_interval;
902
903 local->dynamic_ps_forced_timeout = -1;
904
905 result = ieee80211_wep_init(local);
906 if (result < 0)
907 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
908 result);
909
910 ieee80211_led_init(local);
911
912 rtnl_lock();
913
914 result = ieee80211_init_rate_ctrl_alg(local,
915 hw->rate_control_algorithm);
916 if (result < 0) {
917 wiphy_debug(local->hw.wiphy,
918 "Failed to initialize rate control algorithm\n");
919 goto fail_rate;
920 }
921
922 /* add one default STA interface if supported */
923 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
924 result = ieee80211_if_add(local, "wlan%d", NULL,
925 NL80211_IFTYPE_STATION, NULL);
926 if (result)
927 wiphy_warn(local->hw.wiphy,
928 "Failed to add default virtual iface\n");
929 }
930
931 rtnl_unlock();
932
933 local->network_latency_notifier.notifier_call =
934 ieee80211_max_network_latency;
935 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
936 &local->network_latency_notifier);
937 if (result) {
938 rtnl_lock();
939 goto fail_pm_qos;
940 }
941
942 #ifdef CONFIG_INET
943 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
944 result = register_inetaddr_notifier(&local->ifa_notifier);
945 if (result)
946 goto fail_ifa;
947 #endif
948
949 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
950 local->hw.napi_weight);
951
952 return 0;
953
954 #ifdef CONFIG_INET
955 fail_ifa:
956 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
957 &local->network_latency_notifier);
958 rtnl_lock();
959 #endif
960 fail_pm_qos:
961 ieee80211_led_exit(local);
962 ieee80211_remove_interfaces(local);
963 fail_rate:
964 rtnl_unlock();
965 ieee80211_wep_free(local);
966 sta_info_stop(local);
967 destroy_workqueue(local->workqueue);
968 fail_workqueue:
969 wiphy_unregister(local->hw.wiphy);
970 fail_wiphy_register:
971 if (local->wiphy_ciphers_allocated)
972 kfree(local->hw.wiphy->cipher_suites);
973 kfree(local->int_scan_req);
974 return result;
975 }
976 EXPORT_SYMBOL(ieee80211_register_hw);
977
978 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
979 {
980 struct ieee80211_local *local = hw_to_local(hw);
981
982 tasklet_kill(&local->tx_pending_tasklet);
983 tasklet_kill(&local->tasklet);
984
985 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
986 &local->network_latency_notifier);
987 #ifdef CONFIG_INET
988 unregister_inetaddr_notifier(&local->ifa_notifier);
989 #endif
990
991 rtnl_lock();
992
993 /*
994 * At this point, interface list manipulations are fine
995 * because the driver cannot be handing us frames any
996 * more and the tasklet is killed.
997 */
998 ieee80211_remove_interfaces(local);
999
1000 rtnl_unlock();
1001
1002 /*
1003 * Now all work items will be gone, but the
1004 * timer might still be armed, so delete it
1005 */
1006 del_timer_sync(&local->work_timer);
1007
1008 cancel_work_sync(&local->restart_work);
1009 cancel_work_sync(&local->reconfig_filter);
1010
1011 ieee80211_clear_tx_pending(local);
1012 rate_control_deinitialize(local);
1013
1014 if (skb_queue_len(&local->skb_queue) ||
1015 skb_queue_len(&local->skb_queue_unreliable))
1016 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1017 skb_queue_purge(&local->skb_queue);
1018 skb_queue_purge(&local->skb_queue_unreliable);
1019 skb_queue_purge(&local->rx_skb_queue);
1020
1021 destroy_workqueue(local->workqueue);
1022 wiphy_unregister(local->hw.wiphy);
1023 sta_info_stop(local);
1024 ieee80211_wep_free(local);
1025 ieee80211_led_exit(local);
1026 kfree(local->int_scan_req);
1027 }
1028 EXPORT_SYMBOL(ieee80211_unregister_hw);
1029
1030 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1031 {
1032 WARN_ONCE(1, "Have pending ack frames!\n");
1033 kfree_skb(p);
1034 return 0;
1035 }
1036
1037 void ieee80211_free_hw(struct ieee80211_hw *hw)
1038 {
1039 struct ieee80211_local *local = hw_to_local(hw);
1040
1041 mutex_destroy(&local->iflist_mtx);
1042 mutex_destroy(&local->mtx);
1043
1044 if (local->wiphy_ciphers_allocated)
1045 kfree(local->hw.wiphy->cipher_suites);
1046
1047 idr_for_each(&local->ack_status_frames,
1048 ieee80211_free_ack_frame, NULL);
1049 idr_destroy(&local->ack_status_frames);
1050
1051 wiphy_free(local->hw.wiphy);
1052 }
1053 EXPORT_SYMBOL(ieee80211_free_hw);
1054
1055 static int __init ieee80211_init(void)
1056 {
1057 struct sk_buff *skb;
1058 int ret;
1059
1060 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1061 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1062 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1063
1064 ret = rc80211_minstrel_init();
1065 if (ret)
1066 return ret;
1067
1068 ret = rc80211_minstrel_ht_init();
1069 if (ret)
1070 goto err_minstrel;
1071
1072 ret = rc80211_pid_init();
1073 if (ret)
1074 goto err_pid;
1075
1076 ret = ieee80211_iface_init();
1077 if (ret)
1078 goto err_netdev;
1079
1080 return 0;
1081 err_netdev:
1082 rc80211_pid_exit();
1083 err_pid:
1084 rc80211_minstrel_ht_exit();
1085 err_minstrel:
1086 rc80211_minstrel_exit();
1087
1088 return ret;
1089 }
1090
1091 static void __exit ieee80211_exit(void)
1092 {
1093 rc80211_pid_exit();
1094 rc80211_minstrel_ht_exit();
1095 rc80211_minstrel_exit();
1096
1097 if (mesh_allocated)
1098 ieee80211s_stop();
1099
1100 ieee80211_iface_exit();
1101
1102 rcu_barrier();
1103 }
1104
1105
1106 subsys_initcall(ieee80211_init);
1107 module_exit(ieee80211_exit);
1108
1109 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1110 MODULE_LICENSE("GPL");
Linus' kernel tree