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nl80211/mac80211: support full station state in AP mode
[linux-2.6.git] / net / mac80211 / main.c
blob39cfe8f10ad2dc50d929709715b2763c8e2cccd7
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 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
52 new_flags |= FIF_BCN_PRBRESP_PROMISC;
53
54 if (local->fif_probe_req || local->probe_req_reg)
55 new_flags |= FIF_PROBE_REQ;
56
57 if (local->fif_fcsfail)
58 new_flags |= FIF_FCSFAIL;
59
60 if (local->fif_plcpfail)
61 new_flags |= FIF_PLCPFAIL;
62
63 if (local->fif_control)
64 new_flags |= FIF_CONTROL;
65
66 if (local->fif_other_bss)
67 new_flags |= FIF_OTHER_BSS;
68
69 if (local->fif_pspoll)
70 new_flags |= FIF_PSPOLL;
71
72 spin_lock_bh(&local->filter_lock);
73 changed_flags = local->filter_flags ^ new_flags;
74
75 mc = drv_prepare_multicast(local, &local->mc_list);
76 spin_unlock_bh(&local->filter_lock);
77
78 /* be a bit nasty */
79 new_flags |= (1<<31);
80
81 drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83 WARN_ON(new_flags & (1<<31));
84
85 local->filter_flags = new_flags & ~(1<<31);
86 }
87
88 static void ieee80211_reconfig_filter(struct work_struct *work)
89 {
90 struct ieee80211_local *local =
91 container_of(work, struct ieee80211_local, reconfig_filter);
92
93 ieee80211_configure_filter(local);
94 }
95
96 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
97 {
98 struct ieee80211_sub_if_data *sdata;
99 struct ieee80211_channel *chan;
100 u32 changed = 0;
101 int power;
102 enum nl80211_channel_type channel_type;
103 u32 offchannel_flag;
104 bool scanning = false;
105
106 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
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 = local->tmp_channel;
118 channel_type = NL80211_CHAN_NO_HT;
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 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
127 else
128 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
129
130 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
131
132 if (offchannel_flag || chan != local->hw.conf.channel ||
133 channel_type != local->hw.conf.channel_type) {
134 local->hw.conf.channel = chan;
135 local->hw.conf.channel_type = channel_type;
136 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
137 }
138
139 if (!conf_is_ht(&local->hw.conf)) {
140 /*
141 * mac80211.h documents that this is only valid
142 * when the channel is set to an HT type, and
143 * that otherwise STATIC is used.
144 */
145 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
146 } else if (local->hw.conf.smps_mode != local->smps_mode) {
147 local->hw.conf.smps_mode = local->smps_mode;
148 changed |= IEEE80211_CONF_CHANGE_SMPS;
149 }
150
151 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
152 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
153 test_bit(SCAN_HW_SCANNING, &local->scanning);
154 power = chan->max_power;
155
156 rcu_read_lock();
157 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
158 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
159 continue;
160 power = min(power, sdata->vif.bss_conf.txpower);
161 }
162 rcu_read_unlock();
163
164 if (local->hw.conf.power_level != power) {
165 changed |= IEEE80211_CONF_CHANGE_POWER;
166 local->hw.conf.power_level = power;
167 }
168
169 return changed;
170 }
171
172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
173 {
174 int ret = 0;
175
176 might_sleep();
177
178 if (!local->use_chanctx)
179 changed |= ieee80211_hw_conf_chan(local);
180 else
181 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
182 IEEE80211_CONF_CHANGE_POWER);
183
184 if (changed && local->open_count) {
185 ret = drv_config(local, changed);
186 /*
187 * Goal:
188 * HW reconfiguration should never fail, the driver has told
189 * us what it can support so it should live up to that promise.
190 *
191 * Current status:
192 * rfkill is not integrated with mac80211 and a
193 * configuration command can thus fail if hardware rfkill
194 * is enabled
195 *
196 * FIXME: integrate rfkill with mac80211 and then add this
197 * WARN_ON() back
198 *
199 */
200 /* WARN_ON(ret); */
201 }
202
203 return ret;
204 }
205
206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
207 u32 changed)
208 {
209 struct ieee80211_local *local = sdata->local;
210
211 if (!changed)
212 return;
213
214 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
215 }
216
217 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
218 {
219 sdata->vif.bss_conf.use_cts_prot = false;
220 sdata->vif.bss_conf.use_short_preamble = false;
221 sdata->vif.bss_conf.use_short_slot = false;
222 return BSS_CHANGED_ERP_CTS_PROT |
223 BSS_CHANGED_ERP_PREAMBLE |
224 BSS_CHANGED_ERP_SLOT;
225 }
226
227 static void ieee80211_tasklet_handler(unsigned long data)
228 {
229 struct ieee80211_local *local = (struct ieee80211_local *) data;
230 struct sta_info *sta, *tmp;
231 struct skb_eosp_msg_data *eosp_data;
232 struct sk_buff *skb;
233
234 while ((skb = skb_dequeue(&local->skb_queue)) ||
235 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
236 switch (skb->pkt_type) {
237 case IEEE80211_RX_MSG:
238 /* Clear skb->pkt_type in order to not confuse kernel
239 * netstack. */
240 skb->pkt_type = 0;
241 ieee80211_rx(&local->hw, skb);
242 break;
243 case IEEE80211_TX_STATUS_MSG:
244 skb->pkt_type = 0;
245 ieee80211_tx_status(&local->hw, skb);
246 break;
247 case IEEE80211_EOSP_MSG:
248 eosp_data = (void *)skb->cb;
249 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
250 /* skip wrong virtual interface */
251 if (memcmp(eosp_data->iface,
252 sta->sdata->vif.addr, ETH_ALEN))
253 continue;
254 clear_sta_flag(sta, WLAN_STA_SP);
255 break;
256 }
257 dev_kfree_skb(skb);
258 break;
259 default:
260 WARN(1, "mac80211: Packet is of unknown type %d\n",
261 skb->pkt_type);
262 dev_kfree_skb(skb);
263 break;
264 }
265 }
266 }
267
268 static void ieee80211_restart_work(struct work_struct *work)
269 {
270 struct ieee80211_local *local =
271 container_of(work, struct ieee80211_local, restart_work);
272
273 /* wait for scan work complete */
274 flush_workqueue(local->workqueue);
275
276 mutex_lock(&local->mtx);
277 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
278 rcu_dereference_protected(local->sched_scan_sdata,
279 lockdep_is_held(&local->mtx)),
280 "%s called with hardware scan in progress\n", __func__);
281 mutex_unlock(&local->mtx);
282
283 rtnl_lock();
284 ieee80211_scan_cancel(local);
285 ieee80211_reconfig(local);
286 rtnl_unlock();
287 }
288
289 void ieee80211_restart_hw(struct ieee80211_hw *hw)
290 {
291 struct ieee80211_local *local = hw_to_local(hw);
292
293 trace_api_restart_hw(local);
294
295 wiphy_info(hw->wiphy,
296 "Hardware restart was requested\n");
297
298 /* use this reason, ieee80211_reconfig will unblock it */
299 ieee80211_stop_queues_by_reason(hw,
300 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
301
302 /*
303 * Stop all Rx during the reconfig. We don't want state changes
304 * or driver callbacks while this is in progress.
305 */
306 local->in_reconfig = true;
307 barrier();
308
309 schedule_work(&local->restart_work);
310 }
311 EXPORT_SYMBOL(ieee80211_restart_hw);
312
313 #ifdef CONFIG_INET
314 static int ieee80211_ifa_changed(struct notifier_block *nb,
315 unsigned long data, void *arg)
316 {
317 struct in_ifaddr *ifa = arg;
318 struct ieee80211_local *local =
319 container_of(nb, struct ieee80211_local,
320 ifa_notifier);
321 struct net_device *ndev = ifa->ifa_dev->dev;
322 struct wireless_dev *wdev = ndev->ieee80211_ptr;
323 struct in_device *idev;
324 struct ieee80211_sub_if_data *sdata;
325 struct ieee80211_bss_conf *bss_conf;
326 struct ieee80211_if_managed *ifmgd;
327 int c = 0;
328
329 /* Make sure it's our interface that got changed */
330 if (!wdev)
331 return NOTIFY_DONE;
332
333 if (wdev->wiphy != local->hw.wiphy)
334 return NOTIFY_DONE;
335
336 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
337 bss_conf = &sdata->vif.bss_conf;
338
339 /* ARP filtering is only supported in managed mode */
340 if (sdata->vif.type != NL80211_IFTYPE_STATION)
341 return NOTIFY_DONE;
342
343 idev = __in_dev_get_rtnl(sdata->dev);
344 if (!idev)
345 return NOTIFY_DONE;
346
347 ifmgd = &sdata->u.mgd;
348 mutex_lock(&ifmgd->mtx);
349
350 /* Copy the addresses to the bss_conf list */
351 ifa = idev->ifa_list;
352 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
353 bss_conf->arp_addr_list[c] = ifa->ifa_address;
354 ifa = ifa->ifa_next;
355 c++;
356 }
357
358 /* If not all addresses fit the list, disable filtering */
359 if (ifa) {
360 sdata->arp_filter_state = false;
361 c = 0;
362 } else {
363 sdata->arp_filter_state = true;
364 }
365 bss_conf->arp_addr_cnt = c;
366
367 /* Configure driver only if associated (which also implies it is up) */
368 if (ifmgd->associated) {
369 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
370 ieee80211_bss_info_change_notify(sdata,
371 BSS_CHANGED_ARP_FILTER);
372 }
373
374 mutex_unlock(&ifmgd->mtx);
375
376 return NOTIFY_DONE;
377 }
378 #endif
379
380 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
381 {
382 struct ieee80211_local *local =
383 container_of(napi, struct ieee80211_local, napi);
384
385 return local->ops->napi_poll(&local->hw, budget);
386 }
387
388 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
389 {
390 struct ieee80211_local *local = hw_to_local(hw);
391
392 napi_schedule(&local->napi);
393 }
394 EXPORT_SYMBOL(ieee80211_napi_schedule);
395
396 void ieee80211_napi_complete(struct ieee80211_hw *hw)
397 {
398 struct ieee80211_local *local = hw_to_local(hw);
399
400 napi_complete(&local->napi);
401 }
402 EXPORT_SYMBOL(ieee80211_napi_complete);
403
404 /* There isn't a lot of sense in it, but you can transmit anything you like */
405 static const struct ieee80211_txrx_stypes
406 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
407 [NL80211_IFTYPE_ADHOC] = {
408 .tx = 0xffff,
409 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
410 BIT(IEEE80211_STYPE_AUTH >> 4) |
411 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
412 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
413 },
414 [NL80211_IFTYPE_STATION] = {
415 .tx = 0xffff,
416 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
417 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
418 },
419 [NL80211_IFTYPE_AP] = {
420 .tx = 0xffff,
421 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
422 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
423 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
424 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
425 BIT(IEEE80211_STYPE_AUTH >> 4) |
426 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
427 BIT(IEEE80211_STYPE_ACTION >> 4),
428 },
429 [NL80211_IFTYPE_AP_VLAN] = {
430 /* copy AP */
431 .tx = 0xffff,
432 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
433 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
434 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
435 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
436 BIT(IEEE80211_STYPE_AUTH >> 4) |
437 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
438 BIT(IEEE80211_STYPE_ACTION >> 4),
439 },
440 [NL80211_IFTYPE_P2P_CLIENT] = {
441 .tx = 0xffff,
442 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
443 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
444 },
445 [NL80211_IFTYPE_P2P_GO] = {
446 .tx = 0xffff,
447 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
448 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
449 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
450 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
451 BIT(IEEE80211_STYPE_AUTH >> 4) |
452 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
453 BIT(IEEE80211_STYPE_ACTION >> 4),
454 },
455 [NL80211_IFTYPE_MESH_POINT] = {
456 .tx = 0xffff,
457 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
458 BIT(IEEE80211_STYPE_AUTH >> 4) |
459 BIT(IEEE80211_STYPE_DEAUTH >> 4),
460 },
461 [NL80211_IFTYPE_P2P_DEVICE] = {
462 .tx = 0xffff,
463 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
464 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
465 },
466 };
467
468 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
469 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
470 IEEE80211_HT_AMPDU_PARM_DENSITY,
471
472 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
473 IEEE80211_HT_CAP_MAX_AMSDU |
474 IEEE80211_HT_CAP_SGI_20 |
475 IEEE80211_HT_CAP_SGI_40),
476 .mcs = {
477 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
478 0xff, 0xff, 0xff, 0xff, 0xff, },
479 },
480 };
481
482 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
483 const struct ieee80211_ops *ops)
484 {
485 struct ieee80211_local *local;
486 int priv_size, i;
487 struct wiphy *wiphy;
488 bool use_chanctx;
489
490 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
491 !ops->add_interface || !ops->remove_interface ||
492 !ops->configure_filter))
493 return NULL;
494
495 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
496 return NULL;
497
498 /* check all or no channel context operations exist */
499 i = !!ops->add_chanctx + !!ops->remove_chanctx +
500 !!ops->change_chanctx + !!ops->assign_vif_chanctx +
501 !!ops->unassign_vif_chanctx;
502 if (WARN_ON(i != 0 && i != 5))
503 return NULL;
504 use_chanctx = i == 5;
505
506 /* Ensure 32-byte alignment of our private data and hw private data.
507 * We use the wiphy priv data for both our ieee80211_local and for
508 * the driver's private data
509 *
510 * In memory it'll be like this:
511 *
512 * +-------------------------+
513 * | struct wiphy |
514 * +-------------------------+
515 * | struct ieee80211_local |
516 * +-------------------------+
517 * | driver's private data |
518 * +-------------------------+
519 *
520 */
521 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
522
523 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
524
525 if (!wiphy)
526 return NULL;
527
528 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
529
530 wiphy->privid = mac80211_wiphy_privid;
531
532 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
533 WIPHY_FLAG_4ADDR_AP |
534 WIPHY_FLAG_4ADDR_STATION |
535 WIPHY_FLAG_REPORTS_OBSS |
536 WIPHY_FLAG_OFFCHAN_TX;
537
538 if (ops->remain_on_channel)
539 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
540
541 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
542 NL80211_FEATURE_SAE |
543 NL80211_FEATURE_HT_IBSS |
544 NL80211_FEATURE_VIF_TXPOWER |
545 NL80211_FEATURE_FULL_AP_CLIENT_STATE;
546
547 if (!ops->hw_scan)
548 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
549 NL80211_FEATURE_AP_SCAN;
550
551
552 if (!ops->set_key)
553 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
554
555 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
556
557 local = wiphy_priv(wiphy);
558
559 local->hw.wiphy = wiphy;
560
561 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
562
563 local->ops = ops;
564 local->use_chanctx = use_chanctx;
565
566 /* set up some defaults */
567 local->hw.queues = 1;
568 local->hw.max_rates = 1;
569 local->hw.max_report_rates = 0;
570 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
571 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
572 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
573 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
574 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
575 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
576 IEEE80211_RADIOTAP_MCS_HAVE_GI |
577 IEEE80211_RADIOTAP_MCS_HAVE_BW;
578 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
579 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
580 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
581 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
582
583 INIT_LIST_HEAD(&local->interfaces);
584
585 __hw_addr_init(&local->mc_list);
586
587 mutex_init(&local->iflist_mtx);
588 mutex_init(&local->mtx);
589
590 mutex_init(&local->key_mtx);
591 spin_lock_init(&local->filter_lock);
592 spin_lock_init(&local->queue_stop_reason_lock);
593
594 INIT_LIST_HEAD(&local->chanctx_list);
595 mutex_init(&local->chanctx_mtx);
596
597 /*
598 * The rx_skb_queue is only accessed from tasklets,
599 * but other SKB queues are used from within IRQ
600 * context. Therefore, this one needs a different
601 * locking class so our direct, non-irq-safe use of
602 * the queue's lock doesn't throw lockdep warnings.
603 */
604 skb_queue_head_init_class(&local->rx_skb_queue,
605 &ieee80211_rx_skb_queue_class);
606
607 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
608
609 INIT_WORK(&local->restart_work, ieee80211_restart_work);
610
611 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
612 local->smps_mode = IEEE80211_SMPS_OFF;
613
614 INIT_WORK(&local->dynamic_ps_enable_work,
615 ieee80211_dynamic_ps_enable_work);
616 INIT_WORK(&local->dynamic_ps_disable_work,
617 ieee80211_dynamic_ps_disable_work);
618 setup_timer(&local->dynamic_ps_timer,
619 ieee80211_dynamic_ps_timer, (unsigned long) local);
620
621 INIT_WORK(&local->sched_scan_stopped_work,
622 ieee80211_sched_scan_stopped_work);
623
624 spin_lock_init(&local->ack_status_lock);
625 idr_init(&local->ack_status_frames);
626 /* preallocate at least one entry */
627 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
628
629 sta_info_init(local);
630
631 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
632 skb_queue_head_init(&local->pending[i]);
633 atomic_set(&local->agg_queue_stop[i], 0);
634 }
635 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
636 (unsigned long)local);
637
638 tasklet_init(&local->tasklet,
639 ieee80211_tasklet_handler,
640 (unsigned long) local);
641
642 skb_queue_head_init(&local->skb_queue);
643 skb_queue_head_init(&local->skb_queue_unreliable);
644
645 /* init dummy netdev for use w/ NAPI */
646 init_dummy_netdev(&local->napi_dev);
647
648 ieee80211_led_names(local);
649
650 ieee80211_roc_setup(local);
651
652 return &local->hw;
653 }
654 EXPORT_SYMBOL(ieee80211_alloc_hw);
655
656 int ieee80211_register_hw(struct ieee80211_hw *hw)
657 {
658 struct ieee80211_local *local = hw_to_local(hw);
659 int result, i;
660 enum ieee80211_band band;
661 int channels, max_bitrates;
662 bool supp_ht, supp_vht;
663 netdev_features_t feature_whitelist;
664 static const u32 cipher_suites[] = {
665 /* keep WEP first, it may be removed below */
666 WLAN_CIPHER_SUITE_WEP40,
667 WLAN_CIPHER_SUITE_WEP104,
668 WLAN_CIPHER_SUITE_TKIP,
669 WLAN_CIPHER_SUITE_CCMP,
670
671 /* keep last -- depends on hw flags! */
672 WLAN_CIPHER_SUITE_AES_CMAC
673 };
674
675 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
676 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
677 local->hw.offchannel_tx_hw_queue >= local->hw.queues))
678 return -EINVAL;
679
680 #ifdef CONFIG_PM
681 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
682 (!local->ops->suspend || !local->ops->resume))
683 return -EINVAL;
684 #endif
685
686 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
687 return -EINVAL;
688
689 if (!local->use_chanctx) {
690 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
691 const struct ieee80211_iface_combination *comb;
692
693 comb = &local->hw.wiphy->iface_combinations[i];
694
695 if (comb->num_different_channels > 1)
696 return -EINVAL;
697 }
698 } else {
699 /*
700 * WDS is currently prohibited when channel contexts are used
701 * because there's no clear definition of which channel WDS
702 * type interfaces use
703 */
704 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
705 return -EINVAL;
706 }
707
708 /* Only HW csum features are currently compatible with mac80211 */
709 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
710 NETIF_F_HW_CSUM;
711 if (WARN_ON(hw->netdev_features & ~feature_whitelist))
712 return -EINVAL;
713
714 if (hw->max_report_rates == 0)
715 hw->max_report_rates = hw->max_rates;
716
717 local->rx_chains = 1;
718
719 /*
720 * generic code guarantees at least one band,
721 * set this very early because much code assumes
722 * that hw.conf.channel is assigned
723 */
724 channels = 0;
725 max_bitrates = 0;
726 supp_ht = false;
727 supp_vht = false;
728 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
729 struct ieee80211_supported_band *sband;
730
731 sband = local->hw.wiphy->bands[band];
732 if (!sband)
733 continue;
734 if (!local->use_chanctx && !local->_oper_channel) {
735 /* init channel we're on */
736 local->hw.conf.channel =
737 local->_oper_channel = &sband->channels[0];
738 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
739 }
740 cfg80211_chandef_create(&local->monitor_chandef,
741 &sband->channels[0],
742 NL80211_CHAN_NO_HT);
743 channels += sband->n_channels;
744
745 if (max_bitrates < sband->n_bitrates)
746 max_bitrates = sband->n_bitrates;
747 supp_ht = supp_ht || sband->ht_cap.ht_supported;
748 supp_vht = supp_vht || sband->vht_cap.vht_supported;
749
750 if (sband->ht_cap.ht_supported)
751 local->rx_chains =
752 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
753 local->rx_chains);
754
755 /* TODO: consider VHT for RX chains, hopefully it's the same */
756 }
757
758 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
759 sizeof(void *) * channels, GFP_KERNEL);
760 if (!local->int_scan_req)
761 return -ENOMEM;
762
763 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
764 if (!local->hw.wiphy->bands[band])
765 continue;
766 local->int_scan_req->rates[band] = (u32) -1;
767 }
768
769 /* if low-level driver supports AP, we also support VLAN */
770 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
771 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
772 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
773 }
774
775 /* mac80211 always supports monitor */
776 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
777 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
778
779 /* mac80211 doesn't support more than one IBSS interface right now */
780 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
781 const struct ieee80211_iface_combination *c;
782 int j;
783
784 c = &hw->wiphy->iface_combinations[i];
785
786 for (j = 0; j < c->n_limits; j++)
787 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
788 c->limits[j].max > 1)
789 return -EINVAL;
790 }
791
792 #ifndef CONFIG_MAC80211_MESH
793 /* mesh depends on Kconfig, but drivers should set it if they want */
794 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
795 #endif
796
797 /* if the underlying driver supports mesh, mac80211 will (at least)
798 * provide routing of mesh authentication frames to userspace */
799 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
800 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
801
802 /* mac80211 supports control port protocol changing */
803 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
804
805 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
806 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
807 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
808 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
809
810 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
811 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
812 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
813
814 /*
815 * Calculate scan IE length -- we need this to alloc
816 * memory and to subtract from the driver limit. It
817 * includes the DS Params, (extended) supported rates, and HT
818 * information -- SSID is the driver's responsibility.
819 */
820 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
821 3 /* DS Params */;
822 if (supp_ht)
823 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
824
825 if (supp_vht) {
826 local->scan_ies_len +=
827 2 + sizeof(struct ieee80211_vht_cap);
828
829 /*
830 * (for now at least), drivers wanting to use VHT must
831 * support channel contexts, as they contain all the
832 * necessary VHT information and the global hw config
833 * doesn't (yet)
834 */
835 if (WARN_ON(!local->use_chanctx)) {
836 result = -EINVAL;
837 goto fail_wiphy_register;
838 }
839 }
840
841 if (!local->ops->hw_scan) {
842 /* For hw_scan, driver needs to set these up. */
843 local->hw.wiphy->max_scan_ssids = 4;
844 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
845 }
846
847 /*
848 * If the driver supports any scan IEs, then assume the
849 * limit includes the IEs mac80211 will add, otherwise
850 * leave it at zero and let the driver sort it out; we
851 * still pass our IEs to the driver but userspace will
852 * not be allowed to in that case.
853 */
854 if (local->hw.wiphy->max_scan_ie_len)
855 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
856
857 /* Set up cipher suites unless driver already did */
858 if (!local->hw.wiphy->cipher_suites) {
859 local->hw.wiphy->cipher_suites = cipher_suites;
860 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
861 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
862 local->hw.wiphy->n_cipher_suites--;
863 }
864 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
865 if (local->hw.wiphy->cipher_suites == cipher_suites) {
866 local->hw.wiphy->cipher_suites += 2;
867 local->hw.wiphy->n_cipher_suites -= 2;
868 } else {
869 u32 *suites;
870 int r, w = 0;
871
872 /* Filter out WEP */
873
874 suites = kmemdup(
875 local->hw.wiphy->cipher_suites,
876 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
877 GFP_KERNEL);
878 if (!suites) {
879 result = -ENOMEM;
880 goto fail_wiphy_register;
881 }
882 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
883 u32 suite = local->hw.wiphy->cipher_suites[r];
884 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
885 suite == WLAN_CIPHER_SUITE_WEP104)
886 continue;
887 suites[w++] = suite;
888 }
889 local->hw.wiphy->cipher_suites = suites;
890 local->hw.wiphy->n_cipher_suites = w;
891 local->wiphy_ciphers_allocated = true;
892 }
893 }
894
895 if (!local->ops->remain_on_channel)
896 local->hw.wiphy->max_remain_on_channel_duration = 5000;
897
898 if (local->ops->sched_scan_start)
899 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
900
901 /* mac80211 based drivers don't support internal TDLS setup */
902 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
903 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
904
905 result = wiphy_register(local->hw.wiphy);
906 if (result < 0)
907 goto fail_wiphy_register;
908
909 /*
910 * We use the number of queues for feature tests (QoS, HT) internally
911 * so restrict them appropriately.
912 */
913 if (hw->queues > IEEE80211_MAX_QUEUES)
914 hw->queues = IEEE80211_MAX_QUEUES;
915
916 local->workqueue =
917 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
918 if (!local->workqueue) {
919 result = -ENOMEM;
920 goto fail_workqueue;
921 }
922
923 /*
924 * The hardware needs headroom for sending the frame,
925 * and we need some headroom for passing the frame to monitor
926 * interfaces, but never both at the same time.
927 */
928 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
929 IEEE80211_TX_STATUS_HEADROOM);
930
931 debugfs_hw_add(local);
932
933 /*
934 * if the driver doesn't specify a max listen interval we
935 * use 5 which should be a safe default
936 */
937 if (local->hw.max_listen_interval == 0)
938 local->hw.max_listen_interval = 5;
939
940 local->hw.conf.listen_interval = local->hw.max_listen_interval;
941
942 local->dynamic_ps_forced_timeout = -1;
943
944 result = ieee80211_wep_init(local);
945 if (result < 0)
946 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
947 result);
948
949 ieee80211_led_init(local);
950
951 rtnl_lock();
952
953 result = ieee80211_init_rate_ctrl_alg(local,
954 hw->rate_control_algorithm);
955 if (result < 0) {
956 wiphy_debug(local->hw.wiphy,
957 "Failed to initialize rate control algorithm\n");
958 goto fail_rate;
959 }
960
961 /* add one default STA interface if supported */
962 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
963 result = ieee80211_if_add(local, "wlan%d", NULL,
964 NL80211_IFTYPE_STATION, NULL);
965 if (result)
966 wiphy_warn(local->hw.wiphy,
967 "Failed to add default virtual iface\n");
968 }
969
970 rtnl_unlock();
971
972 local->network_latency_notifier.notifier_call =
973 ieee80211_max_network_latency;
974 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
975 &local->network_latency_notifier);
976 if (result) {
977 rtnl_lock();
978 goto fail_pm_qos;
979 }
980
981 #ifdef CONFIG_INET
982 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
983 result = register_inetaddr_notifier(&local->ifa_notifier);
984 if (result)
985 goto fail_ifa;
986 #endif
987
988 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
989 local->hw.napi_weight);
990
991 return 0;
992
993 #ifdef CONFIG_INET
994 fail_ifa:
995 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
996 &local->network_latency_notifier);
997 rtnl_lock();
998 #endif
999 fail_pm_qos:
1000 ieee80211_led_exit(local);
1001 ieee80211_remove_interfaces(local);
1002 fail_rate:
1003 rtnl_unlock();
1004 ieee80211_wep_free(local);
1005 sta_info_stop(local);
1006 destroy_workqueue(local->workqueue);
1007 fail_workqueue:
1008 wiphy_unregister(local->hw.wiphy);
1009 fail_wiphy_register:
1010 if (local->wiphy_ciphers_allocated)
1011 kfree(local->hw.wiphy->cipher_suites);
1012 kfree(local->int_scan_req);
1013 return result;
1014 }
1015 EXPORT_SYMBOL(ieee80211_register_hw);
1016
1017 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1018 {
1019 struct ieee80211_local *local = hw_to_local(hw);
1020
1021 tasklet_kill(&local->tx_pending_tasklet);
1022 tasklet_kill(&local->tasklet);
1023
1024 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1025 &local->network_latency_notifier);
1026 #ifdef CONFIG_INET
1027 unregister_inetaddr_notifier(&local->ifa_notifier);
1028 #endif
1029
1030 rtnl_lock();
1031
1032 /*
1033 * At this point, interface list manipulations are fine
1034 * because the driver cannot be handing us frames any
1035 * more and the tasklet is killed.
1036 */
1037 ieee80211_remove_interfaces(local);
1038
1039 rtnl_unlock();
1040
1041 cancel_work_sync(&local->restart_work);
1042 cancel_work_sync(&local->reconfig_filter);
1043
1044 ieee80211_clear_tx_pending(local);
1045 rate_control_deinitialize(local);
1046
1047 if (skb_queue_len(&local->skb_queue) ||
1048 skb_queue_len(&local->skb_queue_unreliable))
1049 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1050 skb_queue_purge(&local->skb_queue);
1051 skb_queue_purge(&local->skb_queue_unreliable);
1052 skb_queue_purge(&local->rx_skb_queue);
1053
1054 destroy_workqueue(local->workqueue);
1055 wiphy_unregister(local->hw.wiphy);
1056 sta_info_stop(local);
1057 ieee80211_wep_free(local);
1058 ieee80211_led_exit(local);
1059 kfree(local->int_scan_req);
1060 }
1061 EXPORT_SYMBOL(ieee80211_unregister_hw);
1062
1063 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1064 {
1065 WARN_ONCE(1, "Have pending ack frames!\n");
1066 kfree_skb(p);
1067 return 0;
1068 }
1069
1070 void ieee80211_free_hw(struct ieee80211_hw *hw)
1071 {
1072 struct ieee80211_local *local = hw_to_local(hw);
1073
1074 mutex_destroy(&local->iflist_mtx);
1075 mutex_destroy(&local->mtx);
1076
1077 if (local->wiphy_ciphers_allocated)
1078 kfree(local->hw.wiphy->cipher_suites);
1079
1080 idr_for_each(&local->ack_status_frames,
1081 ieee80211_free_ack_frame, NULL);
1082 idr_destroy(&local->ack_status_frames);
1083
1084 wiphy_free(local->hw.wiphy);
1085 }
1086 EXPORT_SYMBOL(ieee80211_free_hw);
1087
1088 static int __init ieee80211_init(void)
1089 {
1090 struct sk_buff *skb;
1091 int ret;
1092
1093 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1094 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1095 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1096
1097 ret = rc80211_minstrel_init();
1098 if (ret)
1099 return ret;
1100
1101 ret = rc80211_minstrel_ht_init();
1102 if (ret)
1103 goto err_minstrel;
1104
1105 ret = rc80211_pid_init();
1106 if (ret)
1107 goto err_pid;
1108
1109 ret = ieee80211_iface_init();
1110 if (ret)
1111 goto err_netdev;
1112
1113 return 0;
1114 err_netdev:
1115 rc80211_pid_exit();
1116 err_pid:
1117 rc80211_minstrel_ht_exit();
1118 err_minstrel:
1119 rc80211_minstrel_exit();
1120
1121 return ret;
1122 }
1123
1124 static void __exit ieee80211_exit(void)
1125 {
1126 rc80211_pid_exit();
1127 rc80211_minstrel_ht_exit();
1128 rc80211_minstrel_exit();
1129
1130 if (mesh_allocated)
1131 ieee80211s_stop();
1132
1133 ieee80211_iface_exit();
1134
1135 rcu_barrier();
1136 }
1137
1138
1139 subsys_initcall(ieee80211_init);
1140 module_exit(ieee80211_exit);
1141
1142 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1143 MODULE_LICENSE("GPL");
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