xref: /openbmc/linux/net/mac80211/main.c (revision 8bd1369b)
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  * Copyright 2013-2014  Intel Mobile Communications GmbH
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <net/mac80211.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/bitmap.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/addrconf.h>
27 
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "led.h"
34 #include "debugfs.h"
35 
36 void ieee80211_configure_filter(struct ieee80211_local *local)
37 {
38 	u64 mc;
39 	unsigned int changed_flags;
40 	unsigned int new_flags = 0;
41 
42 	if (atomic_read(&local->iff_allmultis))
43 		new_flags |= FIF_ALLMULTI;
44 
45 	if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
46 	    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
47 		new_flags |= FIF_BCN_PRBRESP_PROMISC;
48 
49 	if (local->fif_probe_req || local->probe_req_reg)
50 		new_flags |= FIF_PROBE_REQ;
51 
52 	if (local->fif_fcsfail)
53 		new_flags |= FIF_FCSFAIL;
54 
55 	if (local->fif_plcpfail)
56 		new_flags |= FIF_PLCPFAIL;
57 
58 	if (local->fif_control)
59 		new_flags |= FIF_CONTROL;
60 
61 	if (local->fif_other_bss)
62 		new_flags |= FIF_OTHER_BSS;
63 
64 	if (local->fif_pspoll)
65 		new_flags |= FIF_PSPOLL;
66 
67 	spin_lock_bh(&local->filter_lock);
68 	changed_flags = local->filter_flags ^ new_flags;
69 
70 	mc = drv_prepare_multicast(local, &local->mc_list);
71 	spin_unlock_bh(&local->filter_lock);
72 
73 	/* be a bit nasty */
74 	new_flags |= (1<<31);
75 
76 	drv_configure_filter(local, changed_flags, &new_flags, mc);
77 
78 	WARN_ON(new_flags & (1<<31));
79 
80 	local->filter_flags = new_flags & ~(1<<31);
81 }
82 
83 static void ieee80211_reconfig_filter(struct work_struct *work)
84 {
85 	struct ieee80211_local *local =
86 		container_of(work, struct ieee80211_local, reconfig_filter);
87 
88 	ieee80211_configure_filter(local);
89 }
90 
91 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
92 {
93 	struct ieee80211_sub_if_data *sdata;
94 	struct cfg80211_chan_def chandef = {};
95 	u32 changed = 0;
96 	int power;
97 	u32 offchannel_flag;
98 
99 	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
100 
101 	if (local->scan_chandef.chan) {
102 		chandef = local->scan_chandef;
103 	} else if (local->tmp_channel) {
104 		chandef.chan = local->tmp_channel;
105 		chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
106 		chandef.center_freq1 = chandef.chan->center_freq;
107 	} else
108 		chandef = local->_oper_chandef;
109 
110 	WARN(!cfg80211_chandef_valid(&chandef),
111 	     "control:%d MHz width:%d center: %d/%d MHz",
112 	     chandef.chan->center_freq, chandef.width,
113 	     chandef.center_freq1, chandef.center_freq2);
114 
115 	if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
116 		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
117 	else
118 		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
119 
120 	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
121 
122 	if (offchannel_flag ||
123 	    !cfg80211_chandef_identical(&local->hw.conf.chandef,
124 					&local->_oper_chandef)) {
125 		local->hw.conf.chandef = chandef;
126 		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
127 	}
128 
129 	if (!conf_is_ht(&local->hw.conf)) {
130 		/*
131 		 * mac80211.h documents that this is only valid
132 		 * when the channel is set to an HT type, and
133 		 * that otherwise STATIC is used.
134 		 */
135 		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
136 	} else if (local->hw.conf.smps_mode != local->smps_mode) {
137 		local->hw.conf.smps_mode = local->smps_mode;
138 		changed |= IEEE80211_CONF_CHANGE_SMPS;
139 	}
140 
141 	power = ieee80211_chandef_max_power(&chandef);
142 
143 	rcu_read_lock();
144 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
145 		if (!rcu_access_pointer(sdata->vif.chanctx_conf))
146 			continue;
147 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
148 			continue;
149 		power = min(power, sdata->vif.bss_conf.txpower);
150 	}
151 	rcu_read_unlock();
152 
153 	if (local->hw.conf.power_level != power) {
154 		changed |= IEEE80211_CONF_CHANGE_POWER;
155 		local->hw.conf.power_level = power;
156 	}
157 
158 	return changed;
159 }
160 
161 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
162 {
163 	int ret = 0;
164 
165 	might_sleep();
166 
167 	if (!local->use_chanctx)
168 		changed |= ieee80211_hw_conf_chan(local);
169 	else
170 		changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
171 			     IEEE80211_CONF_CHANGE_POWER);
172 
173 	if (changed && local->open_count) {
174 		ret = drv_config(local, changed);
175 		/*
176 		 * Goal:
177 		 * HW reconfiguration should never fail, the driver has told
178 		 * us what it can support so it should live up to that promise.
179 		 *
180 		 * Current status:
181 		 * rfkill is not integrated with mac80211 and a
182 		 * configuration command can thus fail if hardware rfkill
183 		 * is enabled
184 		 *
185 		 * FIXME: integrate rfkill with mac80211 and then add this
186 		 * WARN_ON() back
187 		 *
188 		 */
189 		/* WARN_ON(ret); */
190 	}
191 
192 	return ret;
193 }
194 
195 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
196 				      u32 changed)
197 {
198 	struct ieee80211_local *local = sdata->local;
199 
200 	if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
201 		return;
202 
203 	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
204 }
205 
206 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
207 {
208 	sdata->vif.bss_conf.use_cts_prot = false;
209 	sdata->vif.bss_conf.use_short_preamble = false;
210 	sdata->vif.bss_conf.use_short_slot = false;
211 	return BSS_CHANGED_ERP_CTS_PROT |
212 	       BSS_CHANGED_ERP_PREAMBLE |
213 	       BSS_CHANGED_ERP_SLOT;
214 }
215 
216 static void ieee80211_tasklet_handler(unsigned long data)
217 {
218 	struct ieee80211_local *local = (struct ieee80211_local *) data;
219 	struct sk_buff *skb;
220 
221 	while ((skb = skb_dequeue(&local->skb_queue)) ||
222 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
223 		switch (skb->pkt_type) {
224 		case IEEE80211_RX_MSG:
225 			/* Clear skb->pkt_type in order to not confuse kernel
226 			 * netstack. */
227 			skb->pkt_type = 0;
228 			ieee80211_rx(&local->hw, skb);
229 			break;
230 		case IEEE80211_TX_STATUS_MSG:
231 			skb->pkt_type = 0;
232 			ieee80211_tx_status(&local->hw, skb);
233 			break;
234 		default:
235 			WARN(1, "mac80211: Packet is of unknown type %d\n",
236 			     skb->pkt_type);
237 			dev_kfree_skb(skb);
238 			break;
239 		}
240 	}
241 }
242 
243 static void ieee80211_restart_work(struct work_struct *work)
244 {
245 	struct ieee80211_local *local =
246 		container_of(work, struct ieee80211_local, restart_work);
247 	struct ieee80211_sub_if_data *sdata;
248 
249 	/* wait for scan work complete */
250 	flush_workqueue(local->workqueue);
251 	flush_work(&local->sched_scan_stopped_work);
252 
253 	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
254 	     "%s called with hardware scan in progress\n", __func__);
255 
256 	flush_work(&local->radar_detected_work);
257 	rtnl_lock();
258 	list_for_each_entry(sdata, &local->interfaces, list)
259 		flush_delayed_work(&sdata->dec_tailroom_needed_wk);
260 	ieee80211_scan_cancel(local);
261 
262 	/* make sure any new ROC will consider local->in_reconfig */
263 	flush_delayed_work(&local->roc_work);
264 	flush_work(&local->hw_roc_done);
265 
266 	/* wait for all packet processing to be done */
267 	synchronize_net();
268 
269 	ieee80211_reconfig(local);
270 	rtnl_unlock();
271 }
272 
273 void ieee80211_restart_hw(struct ieee80211_hw *hw)
274 {
275 	struct ieee80211_local *local = hw_to_local(hw);
276 
277 	trace_api_restart_hw(local);
278 
279 	wiphy_info(hw->wiphy,
280 		   "Hardware restart was requested\n");
281 
282 	/* use this reason, ieee80211_reconfig will unblock it */
283 	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
284 					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
285 					false);
286 
287 	/*
288 	 * Stop all Rx during the reconfig. We don't want state changes
289 	 * or driver callbacks while this is in progress.
290 	 */
291 	local->in_reconfig = true;
292 	barrier();
293 
294 	queue_work(system_freezable_wq, &local->restart_work);
295 }
296 EXPORT_SYMBOL(ieee80211_restart_hw);
297 
298 #ifdef CONFIG_INET
299 static int ieee80211_ifa_changed(struct notifier_block *nb,
300 				 unsigned long data, void *arg)
301 {
302 	struct in_ifaddr *ifa = arg;
303 	struct ieee80211_local *local =
304 		container_of(nb, struct ieee80211_local,
305 			     ifa_notifier);
306 	struct net_device *ndev = ifa->ifa_dev->dev;
307 	struct wireless_dev *wdev = ndev->ieee80211_ptr;
308 	struct in_device *idev;
309 	struct ieee80211_sub_if_data *sdata;
310 	struct ieee80211_bss_conf *bss_conf;
311 	struct ieee80211_if_managed *ifmgd;
312 	int c = 0;
313 
314 	/* Make sure it's our interface that got changed */
315 	if (!wdev)
316 		return NOTIFY_DONE;
317 
318 	if (wdev->wiphy != local->hw.wiphy)
319 		return NOTIFY_DONE;
320 
321 	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
322 	bss_conf = &sdata->vif.bss_conf;
323 
324 	/* ARP filtering is only supported in managed mode */
325 	if (sdata->vif.type != NL80211_IFTYPE_STATION)
326 		return NOTIFY_DONE;
327 
328 	idev = __in_dev_get_rtnl(sdata->dev);
329 	if (!idev)
330 		return NOTIFY_DONE;
331 
332 	ifmgd = &sdata->u.mgd;
333 	sdata_lock(sdata);
334 
335 	/* Copy the addresses to the bss_conf list */
336 	ifa = idev->ifa_list;
337 	while (ifa) {
338 		if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
339 			bss_conf->arp_addr_list[c] = ifa->ifa_address;
340 		ifa = ifa->ifa_next;
341 		c++;
342 	}
343 
344 	bss_conf->arp_addr_cnt = c;
345 
346 	/* Configure driver only if associated (which also implies it is up) */
347 	if (ifmgd->associated)
348 		ieee80211_bss_info_change_notify(sdata,
349 						 BSS_CHANGED_ARP_FILTER);
350 
351 	sdata_unlock(sdata);
352 
353 	return NOTIFY_OK;
354 }
355 #endif
356 
357 #if IS_ENABLED(CONFIG_IPV6)
358 static int ieee80211_ifa6_changed(struct notifier_block *nb,
359 				  unsigned long data, void *arg)
360 {
361 	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
362 	struct inet6_dev *idev = ifa->idev;
363 	struct net_device *ndev = ifa->idev->dev;
364 	struct ieee80211_local *local =
365 		container_of(nb, struct ieee80211_local, ifa6_notifier);
366 	struct wireless_dev *wdev = ndev->ieee80211_ptr;
367 	struct ieee80211_sub_if_data *sdata;
368 
369 	/* Make sure it's our interface that got changed */
370 	if (!wdev || wdev->wiphy != local->hw.wiphy)
371 		return NOTIFY_DONE;
372 
373 	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
374 
375 	/*
376 	 * For now only support station mode. This is mostly because
377 	 * doing AP would have to handle AP_VLAN in some way ...
378 	 */
379 	if (sdata->vif.type != NL80211_IFTYPE_STATION)
380 		return NOTIFY_DONE;
381 
382 	drv_ipv6_addr_change(local, sdata, idev);
383 
384 	return NOTIFY_OK;
385 }
386 #endif
387 
388 /* There isn't a lot of sense in it, but you can transmit anything you like */
389 static const struct ieee80211_txrx_stypes
390 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
391 	[NL80211_IFTYPE_ADHOC] = {
392 		.tx = 0xffff,
393 		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
394 			BIT(IEEE80211_STYPE_AUTH >> 4) |
395 			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
396 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
397 	},
398 	[NL80211_IFTYPE_STATION] = {
399 		.tx = 0xffff,
400 		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
401 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
402 	},
403 	[NL80211_IFTYPE_AP] = {
404 		.tx = 0xffff,
405 		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
406 			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
407 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
408 			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
409 			BIT(IEEE80211_STYPE_AUTH >> 4) |
410 			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
411 			BIT(IEEE80211_STYPE_ACTION >> 4),
412 	},
413 	[NL80211_IFTYPE_AP_VLAN] = {
414 		/* copy AP */
415 		.tx = 0xffff,
416 		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
417 			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
418 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
419 			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
420 			BIT(IEEE80211_STYPE_AUTH >> 4) |
421 			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
422 			BIT(IEEE80211_STYPE_ACTION >> 4),
423 	},
424 	[NL80211_IFTYPE_P2P_CLIENT] = {
425 		.tx = 0xffff,
426 		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
427 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
428 	},
429 	[NL80211_IFTYPE_P2P_GO] = {
430 		.tx = 0xffff,
431 		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
432 			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
433 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
434 			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
435 			BIT(IEEE80211_STYPE_AUTH >> 4) |
436 			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
437 			BIT(IEEE80211_STYPE_ACTION >> 4),
438 	},
439 	[NL80211_IFTYPE_MESH_POINT] = {
440 		.tx = 0xffff,
441 		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
442 			BIT(IEEE80211_STYPE_AUTH >> 4) |
443 			BIT(IEEE80211_STYPE_DEAUTH >> 4),
444 	},
445 	[NL80211_IFTYPE_P2P_DEVICE] = {
446 		.tx = 0xffff,
447 		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
448 			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
449 	},
450 };
451 
452 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
453 	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
454 			     IEEE80211_HT_AMPDU_PARM_DENSITY,
455 
456 	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
457 				IEEE80211_HT_CAP_MAX_AMSDU |
458 				IEEE80211_HT_CAP_SGI_20 |
459 				IEEE80211_HT_CAP_SGI_40 |
460 				IEEE80211_HT_CAP_LDPC_CODING |
461 				IEEE80211_HT_CAP_40MHZ_INTOLERANT),
462 	.mcs = {
463 		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
464 			     0xff, 0xff, 0xff, 0xff, 0xff, },
465 	},
466 };
467 
468 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
469 	.vht_cap_info =
470 		cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
471 			    IEEE80211_VHT_CAP_SHORT_GI_80 |
472 			    IEEE80211_VHT_CAP_SHORT_GI_160 |
473 			    IEEE80211_VHT_CAP_RXSTBC_1 |
474 			    IEEE80211_VHT_CAP_RXSTBC_2 |
475 			    IEEE80211_VHT_CAP_RXSTBC_3 |
476 			    IEEE80211_VHT_CAP_RXSTBC_4 |
477 			    IEEE80211_VHT_CAP_TXSTBC |
478 			    IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
479 			    IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
480 			    IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
481 			    IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
482 			    IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
483 	.supp_mcs = {
484 		.rx_mcs_map = cpu_to_le16(~0),
485 		.tx_mcs_map = cpu_to_le16(~0),
486 	},
487 };
488 
489 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
490 					   const struct ieee80211_ops *ops,
491 					   const char *requested_name)
492 {
493 	struct ieee80211_local *local;
494 	int priv_size, i;
495 	struct wiphy *wiphy;
496 	bool use_chanctx;
497 
498 	if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
499 		    !ops->add_interface || !ops->remove_interface ||
500 		    !ops->configure_filter))
501 		return NULL;
502 
503 	if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
504 		return NULL;
505 
506 	/* check all or no channel context operations exist */
507 	i = !!ops->add_chanctx + !!ops->remove_chanctx +
508 	    !!ops->change_chanctx + !!ops->assign_vif_chanctx +
509 	    !!ops->unassign_vif_chanctx;
510 	if (WARN_ON(i != 0 && i != 5))
511 		return NULL;
512 	use_chanctx = i == 5;
513 
514 	/* Ensure 32-byte alignment of our private data and hw private data.
515 	 * We use the wiphy priv data for both our ieee80211_local and for
516 	 * the driver's private data
517 	 *
518 	 * In memory it'll be like this:
519 	 *
520 	 * +-------------------------+
521 	 * | struct wiphy	    |
522 	 * +-------------------------+
523 	 * | struct ieee80211_local  |
524 	 * +-------------------------+
525 	 * | driver's private data   |
526 	 * +-------------------------+
527 	 *
528 	 */
529 	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
530 
531 	wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
532 
533 	if (!wiphy)
534 		return NULL;
535 
536 	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
537 
538 	wiphy->privid = mac80211_wiphy_privid;
539 
540 	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
541 			WIPHY_FLAG_4ADDR_AP |
542 			WIPHY_FLAG_4ADDR_STATION |
543 			WIPHY_FLAG_REPORTS_OBSS |
544 			WIPHY_FLAG_OFFCHAN_TX;
545 
546 	if (ops->remain_on_channel)
547 		wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
548 
549 	wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
550 			   NL80211_FEATURE_SAE |
551 			   NL80211_FEATURE_HT_IBSS |
552 			   NL80211_FEATURE_VIF_TXPOWER |
553 			   NL80211_FEATURE_MAC_ON_CREATE |
554 			   NL80211_FEATURE_USERSPACE_MPM |
555 			   NL80211_FEATURE_FULL_AP_CLIENT_STATE;
556 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
557 	wiphy_ext_feature_set(wiphy,
558 			      NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
559 
560 	if (!ops->hw_scan)
561 		wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
562 				   NL80211_FEATURE_AP_SCAN;
563 
564 
565 	if (!ops->set_key)
566 		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
567 
568 	if (ops->wake_tx_queue)
569 		wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
570 
571 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
572 
573 	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
574 
575 	local = wiphy_priv(wiphy);
576 
577 	if (sta_info_init(local))
578 		goto err_free;
579 
580 	local->hw.wiphy = wiphy;
581 
582 	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
583 
584 	local->ops = ops;
585 	local->use_chanctx = use_chanctx;
586 
587 	/* set up some defaults */
588 	local->hw.queues = 1;
589 	local->hw.max_rates = 1;
590 	local->hw.max_report_rates = 0;
591 	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
592 	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
593 	local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
594 	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
595 	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
596 	local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
597 					 IEEE80211_RADIOTAP_MCS_HAVE_GI |
598 					 IEEE80211_RADIOTAP_MCS_HAVE_BW;
599 	local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
600 					 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
601 	local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
602 	local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
603 	local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
604 	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
605 	wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
606 
607 	local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
608 
609 	wiphy->extended_capabilities = local->ext_capa;
610 	wiphy->extended_capabilities_mask = local->ext_capa;
611 	wiphy->extended_capabilities_len =
612 		ARRAY_SIZE(local->ext_capa);
613 
614 	INIT_LIST_HEAD(&local->interfaces);
615 	INIT_LIST_HEAD(&local->mon_list);
616 
617 	__hw_addr_init(&local->mc_list);
618 
619 	mutex_init(&local->iflist_mtx);
620 	mutex_init(&local->mtx);
621 
622 	mutex_init(&local->key_mtx);
623 	spin_lock_init(&local->filter_lock);
624 	spin_lock_init(&local->rx_path_lock);
625 	spin_lock_init(&local->queue_stop_reason_lock);
626 
627 	INIT_LIST_HEAD(&local->chanctx_list);
628 	mutex_init(&local->chanctx_mtx);
629 
630 	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
631 
632 	INIT_WORK(&local->restart_work, ieee80211_restart_work);
633 
634 	INIT_WORK(&local->radar_detected_work,
635 		  ieee80211_dfs_radar_detected_work);
636 
637 	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
638 	local->smps_mode = IEEE80211_SMPS_OFF;
639 
640 	INIT_WORK(&local->dynamic_ps_enable_work,
641 		  ieee80211_dynamic_ps_enable_work);
642 	INIT_WORK(&local->dynamic_ps_disable_work,
643 		  ieee80211_dynamic_ps_disable_work);
644 	timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
645 
646 	INIT_WORK(&local->sched_scan_stopped_work,
647 		  ieee80211_sched_scan_stopped_work);
648 
649 	INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
650 
651 	spin_lock_init(&local->ack_status_lock);
652 	idr_init(&local->ack_status_frames);
653 
654 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
655 		skb_queue_head_init(&local->pending[i]);
656 		atomic_set(&local->agg_queue_stop[i], 0);
657 	}
658 	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
659 		     (unsigned long)local);
660 
661 	tasklet_init(&local->tasklet,
662 		     ieee80211_tasklet_handler,
663 		     (unsigned long) local);
664 
665 	skb_queue_head_init(&local->skb_queue);
666 	skb_queue_head_init(&local->skb_queue_unreliable);
667 	skb_queue_head_init(&local->skb_queue_tdls_chsw);
668 
669 	ieee80211_alloc_led_names(local);
670 
671 	ieee80211_roc_setup(local);
672 
673 	local->hw.radiotap_timestamp.units_pos = -1;
674 	local->hw.radiotap_timestamp.accuracy = -1;
675 
676 	return &local->hw;
677  err_free:
678 	wiphy_free(wiphy);
679 	return NULL;
680 }
681 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
682 
683 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
684 {
685 	bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
686 			  IS_ERR(local->wep_rx_tfm));
687 	bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
688 	int n_suites = 0, r = 0, w = 0;
689 	u32 *suites;
690 	static const u32 cipher_suites[] = {
691 		/* keep WEP first, it may be removed below */
692 		WLAN_CIPHER_SUITE_WEP40,
693 		WLAN_CIPHER_SUITE_WEP104,
694 		WLAN_CIPHER_SUITE_TKIP,
695 		WLAN_CIPHER_SUITE_CCMP,
696 		WLAN_CIPHER_SUITE_CCMP_256,
697 		WLAN_CIPHER_SUITE_GCMP,
698 		WLAN_CIPHER_SUITE_GCMP_256,
699 
700 		/* keep last -- depends on hw flags! */
701 		WLAN_CIPHER_SUITE_AES_CMAC,
702 		WLAN_CIPHER_SUITE_BIP_CMAC_256,
703 		WLAN_CIPHER_SUITE_BIP_GMAC_128,
704 		WLAN_CIPHER_SUITE_BIP_GMAC_256,
705 	};
706 
707 	if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
708 	    local->hw.wiphy->cipher_suites) {
709 		/* If the driver advertises, or doesn't support SW crypto,
710 		 * we only need to remove WEP if necessary.
711 		 */
712 		if (have_wep)
713 			return 0;
714 
715 		/* well if it has _no_ ciphers ... fine */
716 		if (!local->hw.wiphy->n_cipher_suites)
717 			return 0;
718 
719 		/* Driver provides cipher suites, but we need to exclude WEP */
720 		suites = kmemdup(local->hw.wiphy->cipher_suites,
721 				 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
722 				 GFP_KERNEL);
723 		if (!suites)
724 			return -ENOMEM;
725 
726 		for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
727 			u32 suite = local->hw.wiphy->cipher_suites[r];
728 
729 			if (suite == WLAN_CIPHER_SUITE_WEP40 ||
730 			    suite == WLAN_CIPHER_SUITE_WEP104)
731 				continue;
732 			suites[w++] = suite;
733 		}
734 	} else if (!local->hw.cipher_schemes) {
735 		/* If the driver doesn't have cipher schemes, there's nothing
736 		 * else to do other than assign the (software supported and
737 		 * perhaps offloaded) cipher suites.
738 		 */
739 		local->hw.wiphy->cipher_suites = cipher_suites;
740 		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
741 
742 		if (!have_mfp)
743 			local->hw.wiphy->n_cipher_suites -= 4;
744 
745 		if (!have_wep) {
746 			local->hw.wiphy->cipher_suites += 2;
747 			local->hw.wiphy->n_cipher_suites -= 2;
748 		}
749 
750 		/* not dynamically allocated, so just return */
751 		return 0;
752 	} else {
753 		const struct ieee80211_cipher_scheme *cs;
754 
755 		cs = local->hw.cipher_schemes;
756 
757 		/* Driver specifies cipher schemes only (but not cipher suites
758 		 * including the schemes)
759 		 *
760 		 * We start counting ciphers defined by schemes, TKIP, CCMP,
761 		 * CCMP-256, GCMP, and GCMP-256
762 		 */
763 		n_suites = local->hw.n_cipher_schemes + 5;
764 
765 		/* check if we have WEP40 and WEP104 */
766 		if (have_wep)
767 			n_suites += 2;
768 
769 		/* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
770 		 * BIP-GMAC-256
771 		 */
772 		if (have_mfp)
773 			n_suites += 4;
774 
775 		suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
776 		if (!suites)
777 			return -ENOMEM;
778 
779 		suites[w++] = WLAN_CIPHER_SUITE_CCMP;
780 		suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
781 		suites[w++] = WLAN_CIPHER_SUITE_TKIP;
782 		suites[w++] = WLAN_CIPHER_SUITE_GCMP;
783 		suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
784 
785 		if (have_wep) {
786 			suites[w++] = WLAN_CIPHER_SUITE_WEP40;
787 			suites[w++] = WLAN_CIPHER_SUITE_WEP104;
788 		}
789 
790 		if (have_mfp) {
791 			suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
792 			suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
793 			suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
794 			suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
795 		}
796 
797 		for (r = 0; r < local->hw.n_cipher_schemes; r++) {
798 			suites[w++] = cs[r].cipher;
799 			if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
800 				kfree(suites);
801 				return -EINVAL;
802 			}
803 		}
804 	}
805 
806 	local->hw.wiphy->cipher_suites = suites;
807 	local->hw.wiphy->n_cipher_suites = w;
808 	local->wiphy_ciphers_allocated = true;
809 
810 	return 0;
811 }
812 
813 int ieee80211_register_hw(struct ieee80211_hw *hw)
814 {
815 	struct ieee80211_local *local = hw_to_local(hw);
816 	int result, i;
817 	enum nl80211_band band;
818 	int channels, max_bitrates;
819 	bool supp_ht, supp_vht;
820 	netdev_features_t feature_whitelist;
821 	struct cfg80211_chan_def dflt_chandef = {};
822 
823 	if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
824 	    (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
825 	     local->hw.offchannel_tx_hw_queue >= local->hw.queues))
826 		return -EINVAL;
827 
828 	if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
829 	    (!local->ops->tdls_channel_switch ||
830 	     !local->ops->tdls_cancel_channel_switch ||
831 	     !local->ops->tdls_recv_channel_switch))
832 		return -EOPNOTSUPP;
833 
834 	if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
835 		    !local->ops->set_frag_threshold))
836 		return -EINVAL;
837 
838 	if (WARN_ON(local->hw.wiphy->interface_modes &
839 			BIT(NL80211_IFTYPE_NAN) &&
840 		    (!local->ops->start_nan || !local->ops->stop_nan)))
841 		return -EINVAL;
842 
843 #ifdef CONFIG_PM
844 	if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
845 		return -EINVAL;
846 #endif
847 
848 	if (!local->use_chanctx) {
849 		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
850 			const struct ieee80211_iface_combination *comb;
851 
852 			comb = &local->hw.wiphy->iface_combinations[i];
853 
854 			if (comb->num_different_channels > 1)
855 				return -EINVAL;
856 		}
857 	} else {
858 		/*
859 		 * WDS is currently prohibited when channel contexts are used
860 		 * because there's no clear definition of which channel WDS
861 		 * type interfaces use
862 		 */
863 		if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
864 			return -EINVAL;
865 
866 		/* DFS is not supported with multi-channel combinations yet */
867 		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
868 			const struct ieee80211_iface_combination *comb;
869 
870 			comb = &local->hw.wiphy->iface_combinations[i];
871 
872 			if (comb->radar_detect_widths &&
873 			    comb->num_different_channels > 1)
874 				return -EINVAL;
875 		}
876 	}
877 
878 	/* Only HW csum features are currently compatible with mac80211 */
879 	feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
880 			    NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
881 			    NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;
882 	if (WARN_ON(hw->netdev_features & ~feature_whitelist))
883 		return -EINVAL;
884 
885 	if (hw->max_report_rates == 0)
886 		hw->max_report_rates = hw->max_rates;
887 
888 	local->rx_chains = 1;
889 
890 	/*
891 	 * generic code guarantees at least one band,
892 	 * set this very early because much code assumes
893 	 * that hw.conf.channel is assigned
894 	 */
895 	channels = 0;
896 	max_bitrates = 0;
897 	supp_ht = false;
898 	supp_vht = false;
899 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
900 		struct ieee80211_supported_band *sband;
901 
902 		sband = local->hw.wiphy->bands[band];
903 		if (!sband)
904 			continue;
905 
906 		if (!dflt_chandef.chan) {
907 			cfg80211_chandef_create(&dflt_chandef,
908 						&sband->channels[0],
909 						NL80211_CHAN_NO_HT);
910 			/* init channel we're on */
911 			if (!local->use_chanctx && !local->_oper_chandef.chan) {
912 				local->hw.conf.chandef = dflt_chandef;
913 				local->_oper_chandef = dflt_chandef;
914 			}
915 			local->monitor_chandef = dflt_chandef;
916 		}
917 
918 		channels += sband->n_channels;
919 
920 		if (max_bitrates < sband->n_bitrates)
921 			max_bitrates = sband->n_bitrates;
922 		supp_ht = supp_ht || sband->ht_cap.ht_supported;
923 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
924 
925 		if (!sband->ht_cap.ht_supported)
926 			continue;
927 
928 		/* TODO: consider VHT for RX chains, hopefully it's the same */
929 		local->rx_chains =
930 			max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
931 			    local->rx_chains);
932 
933 		/* no need to mask, SM_PS_DISABLED has all bits set */
934 		sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
935 			             IEEE80211_HT_CAP_SM_PS_SHIFT;
936 	}
937 
938 	/* if low-level driver supports AP, we also support VLAN.
939 	 * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
940 	 * based on their support to transmit SW encrypted packets.
941 	 */
942 	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
943 	    !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
944 		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
945 		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
946 	}
947 
948 	/* mac80211 always supports monitor */
949 	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
950 	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
951 
952 	/* mac80211 doesn't support more than one IBSS interface right now */
953 	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
954 		const struct ieee80211_iface_combination *c;
955 		int j;
956 
957 		c = &hw->wiphy->iface_combinations[i];
958 
959 		for (j = 0; j < c->n_limits; j++)
960 			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
961 			    c->limits[j].max > 1)
962 				return -EINVAL;
963 	}
964 
965 	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
966 				      sizeof(void *) * channels, GFP_KERNEL);
967 	if (!local->int_scan_req)
968 		return -ENOMEM;
969 
970 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
971 		if (!local->hw.wiphy->bands[band])
972 			continue;
973 		local->int_scan_req->rates[band] = (u32) -1;
974 	}
975 
976 #ifndef CONFIG_MAC80211_MESH
977 	/* mesh depends on Kconfig, but drivers should set it if they want */
978 	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
979 #endif
980 
981 	/* if the underlying driver supports mesh, mac80211 will (at least)
982 	 * provide routing of mesh authentication frames to userspace */
983 	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
984 		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
985 
986 	/* mac80211 supports control port protocol changing */
987 	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
988 
989 	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
990 		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
991 	} else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
992 		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
993 		if (hw->max_signal <= 0) {
994 			result = -EINVAL;
995 			goto fail_wiphy_register;
996 		}
997 	}
998 
999 	/*
1000 	 * Calculate scan IE length -- we need this to alloc
1001 	 * memory and to subtract from the driver limit. It
1002 	 * includes the DS Params, (extended) supported rates, and HT
1003 	 * information -- SSID is the driver's responsibility.
1004 	 */
1005 	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1006 		3 /* DS Params */;
1007 	if (supp_ht)
1008 		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1009 
1010 	if (supp_vht)
1011 		local->scan_ies_len +=
1012 			2 + sizeof(struct ieee80211_vht_cap);
1013 
1014 	if (!local->ops->hw_scan) {
1015 		/* For hw_scan, driver needs to set these up. */
1016 		local->hw.wiphy->max_scan_ssids = 4;
1017 		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1018 	}
1019 
1020 	/*
1021 	 * If the driver supports any scan IEs, then assume the
1022 	 * limit includes the IEs mac80211 will add, otherwise
1023 	 * leave it at zero and let the driver sort it out; we
1024 	 * still pass our IEs to the driver but userspace will
1025 	 * not be allowed to in that case.
1026 	 */
1027 	if (local->hw.wiphy->max_scan_ie_len)
1028 		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1029 
1030 	WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1031 					 local->hw.n_cipher_schemes));
1032 
1033 	result = ieee80211_init_cipher_suites(local);
1034 	if (result < 0)
1035 		goto fail_wiphy_register;
1036 
1037 	if (!local->ops->remain_on_channel)
1038 		local->hw.wiphy->max_remain_on_channel_duration = 5000;
1039 
1040 	/* mac80211 based drivers don't support internal TDLS setup */
1041 	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1042 		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1043 
1044 	/* mac80211 supports eCSA, if the driver supports STA CSA at all */
1045 	if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1046 		local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1047 
1048 	local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1049 
1050 	result = wiphy_register(local->hw.wiphy);
1051 	if (result < 0)
1052 		goto fail_wiphy_register;
1053 
1054 	/*
1055 	 * We use the number of queues for feature tests (QoS, HT) internally
1056 	 * so restrict them appropriately.
1057 	 */
1058 	if (hw->queues > IEEE80211_MAX_QUEUES)
1059 		hw->queues = IEEE80211_MAX_QUEUES;
1060 
1061 	local->workqueue =
1062 		alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1063 	if (!local->workqueue) {
1064 		result = -ENOMEM;
1065 		goto fail_workqueue;
1066 	}
1067 
1068 	/*
1069 	 * The hardware needs headroom for sending the frame,
1070 	 * and we need some headroom for passing the frame to monitor
1071 	 * interfaces, but never both at the same time.
1072 	 */
1073 	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1074 				   IEEE80211_TX_STATUS_HEADROOM);
1075 
1076 	debugfs_hw_add(local);
1077 
1078 	/*
1079 	 * if the driver doesn't specify a max listen interval we
1080 	 * use 5 which should be a safe default
1081 	 */
1082 	if (local->hw.max_listen_interval == 0)
1083 		local->hw.max_listen_interval = 5;
1084 
1085 	local->hw.conf.listen_interval = local->hw.max_listen_interval;
1086 
1087 	local->dynamic_ps_forced_timeout = -1;
1088 
1089 	if (!local->hw.max_nan_de_entries)
1090 		local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1091 
1092 	result = ieee80211_wep_init(local);
1093 	if (result < 0)
1094 		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1095 			    result);
1096 
1097 	local->hw.conf.flags = IEEE80211_CONF_IDLE;
1098 
1099 	ieee80211_led_init(local);
1100 
1101 	result = ieee80211_txq_setup_flows(local);
1102 	if (result)
1103 		goto fail_flows;
1104 
1105 	rtnl_lock();
1106 
1107 	result = ieee80211_init_rate_ctrl_alg(local,
1108 					      hw->rate_control_algorithm);
1109 	if (result < 0) {
1110 		wiphy_debug(local->hw.wiphy,
1111 			    "Failed to initialize rate control algorithm\n");
1112 		goto fail_rate;
1113 	}
1114 
1115 	/* add one default STA interface if supported */
1116 	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1117 	    !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1118 		result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1119 					  NL80211_IFTYPE_STATION, NULL);
1120 		if (result)
1121 			wiphy_warn(local->hw.wiphy,
1122 				   "Failed to add default virtual iface\n");
1123 	}
1124 
1125 	rtnl_unlock();
1126 
1127 #ifdef CONFIG_INET
1128 	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1129 	result = register_inetaddr_notifier(&local->ifa_notifier);
1130 	if (result)
1131 		goto fail_ifa;
1132 #endif
1133 
1134 #if IS_ENABLED(CONFIG_IPV6)
1135 	local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1136 	result = register_inet6addr_notifier(&local->ifa6_notifier);
1137 	if (result)
1138 		goto fail_ifa6;
1139 #endif
1140 
1141 	return 0;
1142 
1143 #if IS_ENABLED(CONFIG_IPV6)
1144  fail_ifa6:
1145 #ifdef CONFIG_INET
1146 	unregister_inetaddr_notifier(&local->ifa_notifier);
1147 #endif
1148 #endif
1149 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1150  fail_ifa:
1151 #endif
1152 	rtnl_lock();
1153 	rate_control_deinitialize(local);
1154 	ieee80211_remove_interfaces(local);
1155  fail_rate:
1156 	rtnl_unlock();
1157 	ieee80211_led_exit(local);
1158 	ieee80211_wep_free(local);
1159 	ieee80211_txq_teardown_flows(local);
1160  fail_flows:
1161 	destroy_workqueue(local->workqueue);
1162  fail_workqueue:
1163 	wiphy_unregister(local->hw.wiphy);
1164  fail_wiphy_register:
1165 	if (local->wiphy_ciphers_allocated)
1166 		kfree(local->hw.wiphy->cipher_suites);
1167 	kfree(local->int_scan_req);
1168 	return result;
1169 }
1170 EXPORT_SYMBOL(ieee80211_register_hw);
1171 
1172 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1173 {
1174 	struct ieee80211_local *local = hw_to_local(hw);
1175 
1176 	tasklet_kill(&local->tx_pending_tasklet);
1177 	tasklet_kill(&local->tasklet);
1178 
1179 #ifdef CONFIG_INET
1180 	unregister_inetaddr_notifier(&local->ifa_notifier);
1181 #endif
1182 #if IS_ENABLED(CONFIG_IPV6)
1183 	unregister_inet6addr_notifier(&local->ifa6_notifier);
1184 #endif
1185 
1186 	rtnl_lock();
1187 
1188 	/*
1189 	 * At this point, interface list manipulations are fine
1190 	 * because the driver cannot be handing us frames any
1191 	 * more and the tasklet is killed.
1192 	 */
1193 	ieee80211_remove_interfaces(local);
1194 
1195 	rtnl_unlock();
1196 
1197 	cancel_delayed_work_sync(&local->roc_work);
1198 	cancel_work_sync(&local->restart_work);
1199 	cancel_work_sync(&local->reconfig_filter);
1200 	cancel_work_sync(&local->tdls_chsw_work);
1201 	flush_work(&local->sched_scan_stopped_work);
1202 	flush_work(&local->radar_detected_work);
1203 
1204 	ieee80211_clear_tx_pending(local);
1205 	rate_control_deinitialize(local);
1206 
1207 	if (skb_queue_len(&local->skb_queue) ||
1208 	    skb_queue_len(&local->skb_queue_unreliable))
1209 		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1210 	skb_queue_purge(&local->skb_queue);
1211 	skb_queue_purge(&local->skb_queue_unreliable);
1212 	skb_queue_purge(&local->skb_queue_tdls_chsw);
1213 	ieee80211_txq_teardown_flows(local);
1214 
1215 	destroy_workqueue(local->workqueue);
1216 	wiphy_unregister(local->hw.wiphy);
1217 	ieee80211_wep_free(local);
1218 	ieee80211_led_exit(local);
1219 	kfree(local->int_scan_req);
1220 }
1221 EXPORT_SYMBOL(ieee80211_unregister_hw);
1222 
1223 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1224 {
1225 	WARN_ONCE(1, "Have pending ack frames!\n");
1226 	kfree_skb(p);
1227 	return 0;
1228 }
1229 
1230 void ieee80211_free_hw(struct ieee80211_hw *hw)
1231 {
1232 	struct ieee80211_local *local = hw_to_local(hw);
1233 
1234 	mutex_destroy(&local->iflist_mtx);
1235 	mutex_destroy(&local->mtx);
1236 
1237 	if (local->wiphy_ciphers_allocated)
1238 		kfree(local->hw.wiphy->cipher_suites);
1239 
1240 	idr_for_each(&local->ack_status_frames,
1241 		     ieee80211_free_ack_frame, NULL);
1242 	idr_destroy(&local->ack_status_frames);
1243 
1244 	sta_info_stop(local);
1245 
1246 	ieee80211_free_led_names(local);
1247 
1248 	wiphy_free(local->hw.wiphy);
1249 }
1250 EXPORT_SYMBOL(ieee80211_free_hw);
1251 
1252 static int __init ieee80211_init(void)
1253 {
1254 	struct sk_buff *skb;
1255 	int ret;
1256 
1257 	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1258 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1259 		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1260 
1261 	ret = rc80211_minstrel_init();
1262 	if (ret)
1263 		return ret;
1264 
1265 	ret = rc80211_minstrel_ht_init();
1266 	if (ret)
1267 		goto err_minstrel;
1268 
1269 	ret = ieee80211_iface_init();
1270 	if (ret)
1271 		goto err_netdev;
1272 
1273 	return 0;
1274  err_netdev:
1275 	rc80211_minstrel_ht_exit();
1276  err_minstrel:
1277 	rc80211_minstrel_exit();
1278 
1279 	return ret;
1280 }
1281 
1282 static void __exit ieee80211_exit(void)
1283 {
1284 	rc80211_minstrel_ht_exit();
1285 	rc80211_minstrel_exit();
1286 
1287 	ieee80211s_stop();
1288 
1289 	ieee80211_iface_exit();
1290 
1291 	rcu_barrier();
1292 }
1293 
1294 
1295 subsys_initcall(ieee80211_init);
1296 module_exit(ieee80211_exit);
1297 
1298 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1299 MODULE_LICENSE("GPL");
1300