Merge remote-tracking branch 'grant/devicetree/merge' into dt-fixes
[firefly-linux-kernel-4.4.55.git] / net / mac80211 / main.c
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 #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 "cfg.h"
35 #include "debugfs.h"
36
37 void ieee80211_configure_filter(struct ieee80211_local *local)
38 {
39         u64 mc;
40         unsigned int changed_flags;
41         unsigned int new_flags = 0;
42
43         if (atomic_read(&local->iff_promiscs))
44                 new_flags |= FIF_PROMISC_IN_BSS;
45
46         if (atomic_read(&local->iff_allmultis))
47                 new_flags |= FIF_ALLMULTI;
48
49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
50             test_bit(SCAN_ONCHANNEL_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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
96 {
97         struct ieee80211_sub_if_data *sdata;
98         struct cfg80211_chan_def chandef = {};
99         u32 changed = 0;
100         int power;
101         u32 offchannel_flag;
102
103         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
104
105         if (local->scan_chandef.chan) {
106                 chandef = local->scan_chandef;
107         } else if (local->tmp_channel) {
108                 chandef.chan = local->tmp_channel;
109                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
110                 chandef.center_freq1 = chandef.chan->center_freq;
111         } else
112                 chandef = local->_oper_chandef;
113
114         WARN(!cfg80211_chandef_valid(&chandef),
115              "control:%d MHz width:%d center: %d/%d MHz",
116              chandef.chan->center_freq, chandef.width,
117              chandef.center_freq1, chandef.center_freq2);
118
119         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
121         else
122                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
123
124         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
125
126         if (offchannel_flag ||
127             !cfg80211_chandef_identical(&local->hw.conf.chandef,
128                                         &local->_oper_chandef)) {
129                 local->hw.conf.chandef = chandef;
130                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
131         }
132
133         if (!conf_is_ht(&local->hw.conf)) {
134                 /*
135                  * mac80211.h documents that this is only valid
136                  * when the channel is set to an HT type, and
137                  * that otherwise STATIC is used.
138                  */
139                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
140         } else if (local->hw.conf.smps_mode != local->smps_mode) {
141                 local->hw.conf.smps_mode = local->smps_mode;
142                 changed |= IEEE80211_CONF_CHANGE_SMPS;
143         }
144
145         power = ieee80211_chandef_max_power(&chandef);
146
147         rcu_read_lock();
148         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
149                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
150                         continue;
151                 power = min(power, sdata->vif.bss_conf.txpower);
152         }
153         rcu_read_unlock();
154
155         if (local->hw.conf.power_level != power) {
156                 changed |= IEEE80211_CONF_CHANGE_POWER;
157                 local->hw.conf.power_level = power;
158         }
159
160         return changed;
161 }
162
163 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
164 {
165         int ret = 0;
166
167         might_sleep();
168
169         if (!local->use_chanctx)
170                 changed |= ieee80211_hw_conf_chan(local);
171         else
172                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
173                              IEEE80211_CONF_CHANGE_POWER);
174
175         if (changed && local->open_count) {
176                 ret = drv_config(local, changed);
177                 /*
178                  * Goal:
179                  * HW reconfiguration should never fail, the driver has told
180                  * us what it can support so it should live up to that promise.
181                  *
182                  * Current status:
183                  * rfkill is not integrated with mac80211 and a
184                  * configuration command can thus fail if hardware rfkill
185                  * is enabled
186                  *
187                  * FIXME: integrate rfkill with mac80211 and then add this
188                  * WARN_ON() back
189                  *
190                  */
191                 /* WARN_ON(ret); */
192         }
193
194         return ret;
195 }
196
197 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
198                                       u32 changed)
199 {
200         struct ieee80211_local *local = sdata->local;
201
202         if (!changed)
203                 return;
204
205         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
206 }
207
208 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
209 {
210         sdata->vif.bss_conf.use_cts_prot = false;
211         sdata->vif.bss_conf.use_short_preamble = false;
212         sdata->vif.bss_conf.use_short_slot = false;
213         return BSS_CHANGED_ERP_CTS_PROT |
214                BSS_CHANGED_ERP_PREAMBLE |
215                BSS_CHANGED_ERP_SLOT;
216 }
217
218 static void ieee80211_tasklet_handler(unsigned long data)
219 {
220         struct ieee80211_local *local = (struct ieee80211_local *) data;
221         struct sk_buff *skb;
222
223         while ((skb = skb_dequeue(&local->skb_queue)) ||
224                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
225                 switch (skb->pkt_type) {
226                 case IEEE80211_RX_MSG:
227                         /* Clear skb->pkt_type in order to not confuse kernel
228                          * netstack. */
229                         skb->pkt_type = 0;
230                         ieee80211_rx(&local->hw, skb);
231                         break;
232                 case IEEE80211_TX_STATUS_MSG:
233                         skb->pkt_type = 0;
234                         ieee80211_tx_status(&local->hw, skb);
235                         break;
236                 default:
237                         WARN(1, "mac80211: Packet is of unknown type %d\n",
238                              skb->pkt_type);
239                         dev_kfree_skb(skb);
240                         break;
241                 }
242         }
243 }
244
245 static void ieee80211_restart_work(struct work_struct *work)
246 {
247         struct ieee80211_local *local =
248                 container_of(work, struct ieee80211_local, restart_work);
249
250         /* wait for scan work complete */
251         flush_workqueue(local->workqueue);
252
253         mutex_lock(&local->mtx);
254         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
255              rcu_dereference_protected(local->sched_scan_sdata,
256                                        lockdep_is_held(&local->mtx)),
257                 "%s called with hardware scan in progress\n", __func__);
258         mutex_unlock(&local->mtx);
259
260         rtnl_lock();
261         ieee80211_scan_cancel(local);
262         ieee80211_reconfig(local);
263         rtnl_unlock();
264 }
265
266 void ieee80211_restart_hw(struct ieee80211_hw *hw)
267 {
268         struct ieee80211_local *local = hw_to_local(hw);
269
270         trace_api_restart_hw(local);
271
272         wiphy_info(hw->wiphy,
273                    "Hardware restart was requested\n");
274
275         /* use this reason, ieee80211_reconfig will unblock it */
276         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
277                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
278
279         /*
280          * Stop all Rx during the reconfig. We don't want state changes
281          * or driver callbacks while this is in progress.
282          */
283         local->in_reconfig = true;
284         barrier();
285
286         schedule_work(&local->restart_work);
287 }
288 EXPORT_SYMBOL(ieee80211_restart_hw);
289
290 #ifdef CONFIG_INET
291 static int ieee80211_ifa_changed(struct notifier_block *nb,
292                                  unsigned long data, void *arg)
293 {
294         struct in_ifaddr *ifa = arg;
295         struct ieee80211_local *local =
296                 container_of(nb, struct ieee80211_local,
297                              ifa_notifier);
298         struct net_device *ndev = ifa->ifa_dev->dev;
299         struct wireless_dev *wdev = ndev->ieee80211_ptr;
300         struct in_device *idev;
301         struct ieee80211_sub_if_data *sdata;
302         struct ieee80211_bss_conf *bss_conf;
303         struct ieee80211_if_managed *ifmgd;
304         int c = 0;
305
306         /* Make sure it's our interface that got changed */
307         if (!wdev)
308                 return NOTIFY_DONE;
309
310         if (wdev->wiphy != local->hw.wiphy)
311                 return NOTIFY_DONE;
312
313         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
314         bss_conf = &sdata->vif.bss_conf;
315
316         /* ARP filtering is only supported in managed mode */
317         if (sdata->vif.type != NL80211_IFTYPE_STATION)
318                 return NOTIFY_DONE;
319
320         idev = __in_dev_get_rtnl(sdata->dev);
321         if (!idev)
322                 return NOTIFY_DONE;
323
324         ifmgd = &sdata->u.mgd;
325         sdata_lock(sdata);
326
327         /* Copy the addresses to the bss_conf list */
328         ifa = idev->ifa_list;
329         while (ifa) {
330                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
331                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
332                 ifa = ifa->ifa_next;
333                 c++;
334         }
335
336         bss_conf->arp_addr_cnt = c;
337
338         /* Configure driver only if associated (which also implies it is up) */
339         if (ifmgd->associated)
340                 ieee80211_bss_info_change_notify(sdata,
341                                                  BSS_CHANGED_ARP_FILTER);
342
343         sdata_unlock(sdata);
344
345         return NOTIFY_DONE;
346 }
347 #endif
348
349 #if IS_ENABLED(CONFIG_IPV6)
350 static int ieee80211_ifa6_changed(struct notifier_block *nb,
351                                   unsigned long data, void *arg)
352 {
353         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
354         struct inet6_dev *idev = ifa->idev;
355         struct net_device *ndev = ifa->idev->dev;
356         struct ieee80211_local *local =
357                 container_of(nb, struct ieee80211_local, ifa6_notifier);
358         struct wireless_dev *wdev = ndev->ieee80211_ptr;
359         struct ieee80211_sub_if_data *sdata;
360
361         /* Make sure it's our interface that got changed */
362         if (!wdev || wdev->wiphy != local->hw.wiphy)
363                 return NOTIFY_DONE;
364
365         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
366
367         /*
368          * For now only support station mode. This is mostly because
369          * doing AP would have to handle AP_VLAN in some way ...
370          */
371         if (sdata->vif.type != NL80211_IFTYPE_STATION)
372                 return NOTIFY_DONE;
373
374         drv_ipv6_addr_change(local, sdata, idev);
375
376         return NOTIFY_DONE;
377 }
378 #endif
379
380 /* There isn't a lot of sense in it, but you can transmit anything you like */
381 static const struct ieee80211_txrx_stypes
382 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
383         [NL80211_IFTYPE_ADHOC] = {
384                 .tx = 0xffff,
385                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
386                         BIT(IEEE80211_STYPE_AUTH >> 4) |
387                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
388                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
389         },
390         [NL80211_IFTYPE_STATION] = {
391                 .tx = 0xffff,
392                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
393                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
394         },
395         [NL80211_IFTYPE_AP] = {
396                 .tx = 0xffff,
397                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
398                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
399                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
400                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
401                         BIT(IEEE80211_STYPE_AUTH >> 4) |
402                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
403                         BIT(IEEE80211_STYPE_ACTION >> 4),
404         },
405         [NL80211_IFTYPE_AP_VLAN] = {
406                 /* copy AP */
407                 .tx = 0xffff,
408                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
409                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
410                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
411                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
412                         BIT(IEEE80211_STYPE_AUTH >> 4) |
413                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
414                         BIT(IEEE80211_STYPE_ACTION >> 4),
415         },
416         [NL80211_IFTYPE_P2P_CLIENT] = {
417                 .tx = 0xffff,
418                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
419                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
420         },
421         [NL80211_IFTYPE_P2P_GO] = {
422                 .tx = 0xffff,
423                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
424                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
425                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
426                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
427                         BIT(IEEE80211_STYPE_AUTH >> 4) |
428                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
429                         BIT(IEEE80211_STYPE_ACTION >> 4),
430         },
431         [NL80211_IFTYPE_MESH_POINT] = {
432                 .tx = 0xffff,
433                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
434                         BIT(IEEE80211_STYPE_AUTH >> 4) |
435                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
436         },
437         [NL80211_IFTYPE_P2P_DEVICE] = {
438                 .tx = 0xffff,
439                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
440                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
441         },
442 };
443
444 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
445         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
446                              IEEE80211_HT_AMPDU_PARM_DENSITY,
447
448         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
449                                 IEEE80211_HT_CAP_MAX_AMSDU |
450                                 IEEE80211_HT_CAP_SGI_20 |
451                                 IEEE80211_HT_CAP_SGI_40),
452         .mcs = {
453                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
454                              0xff, 0xff, 0xff, 0xff, 0xff, },
455         },
456 };
457
458 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
459         .vht_cap_info =
460                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
461                             IEEE80211_VHT_CAP_SHORT_GI_80 |
462                             IEEE80211_VHT_CAP_SHORT_GI_160 |
463                             IEEE80211_VHT_CAP_RXSTBC_1 |
464                             IEEE80211_VHT_CAP_RXSTBC_2 |
465                             IEEE80211_VHT_CAP_RXSTBC_3 |
466                             IEEE80211_VHT_CAP_RXSTBC_4 |
467                             IEEE80211_VHT_CAP_TXSTBC |
468                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
469                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
470                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
471                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
472                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
473         .supp_mcs = {
474                 .rx_mcs_map = cpu_to_le16(~0),
475                 .tx_mcs_map = cpu_to_le16(~0),
476         },
477 };
478
479 static const u8 extended_capabilities[] = {
480         0, 0, 0, 0, 0, 0, 0,
481         WLAN_EXT_CAPA8_OPMODE_NOTIF,
482 };
483
484 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
485                                         const struct ieee80211_ops *ops)
486 {
487         struct ieee80211_local *local;
488         int priv_size, i;
489         struct wiphy *wiphy;
490         bool use_chanctx;
491
492         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
493                     !ops->add_interface || !ops->remove_interface ||
494                     !ops->configure_filter))
495                 return NULL;
496
497         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
498                 return NULL;
499
500         /* check all or no channel context operations exist */
501         i = !!ops->add_chanctx + !!ops->remove_chanctx +
502             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
503             !!ops->unassign_vif_chanctx;
504         if (WARN_ON(i != 0 && i != 5))
505                 return NULL;
506         use_chanctx = i == 5;
507
508         /* Ensure 32-byte alignment of our private data and hw private data.
509          * We use the wiphy priv data for both our ieee80211_local and for
510          * the driver's private data
511          *
512          * In memory it'll be like this:
513          *
514          * +-------------------------+
515          * | struct wiphy           |
516          * +-------------------------+
517          * | struct ieee80211_local  |
518          * +-------------------------+
519          * | driver's private data   |
520          * +-------------------------+
521          *
522          */
523         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
524
525         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
526
527         if (!wiphy)
528                 return NULL;
529
530         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
531
532         wiphy->privid = mac80211_wiphy_privid;
533
534         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
535                         WIPHY_FLAG_4ADDR_AP |
536                         WIPHY_FLAG_4ADDR_STATION |
537                         WIPHY_FLAG_REPORTS_OBSS |
538                         WIPHY_FLAG_OFFCHAN_TX;
539
540         wiphy->extended_capabilities = extended_capabilities;
541         wiphy->extended_capabilities_mask = extended_capabilities;
542         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
543
544         if (ops->remain_on_channel)
545                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
546
547         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
548                            NL80211_FEATURE_SAE |
549                            NL80211_FEATURE_HT_IBSS |
550                            NL80211_FEATURE_VIF_TXPOWER |
551                            NL80211_FEATURE_USERSPACE_MPM;
552
553         if (!ops->hw_scan)
554                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
555                                    NL80211_FEATURE_AP_SCAN;
556
557
558         if (!ops->set_key)
559                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
560
561         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
562
563         local = wiphy_priv(wiphy);
564
565         local->hw.wiphy = wiphy;
566
567         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
568
569         local->ops = ops;
570         local->use_chanctx = use_chanctx;
571
572         /* set up some defaults */
573         local->hw.queues = 1;
574         local->hw.max_rates = 1;
575         local->hw.max_report_rates = 0;
576         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
577         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
578         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
579         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
580         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
581         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
582                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
583                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
584         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
585                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
586         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
587         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
588         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
589         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
590         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
591
592         INIT_LIST_HEAD(&local->interfaces);
593
594         __hw_addr_init(&local->mc_list);
595
596         mutex_init(&local->iflist_mtx);
597         mutex_init(&local->mtx);
598
599         mutex_init(&local->key_mtx);
600         spin_lock_init(&local->filter_lock);
601         spin_lock_init(&local->rx_path_lock);
602         spin_lock_init(&local->queue_stop_reason_lock);
603
604         INIT_LIST_HEAD(&local->chanctx_list);
605         mutex_init(&local->chanctx_mtx);
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->radar_detected_work,
612                   ieee80211_dfs_radar_detected_work);
613
614         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
615         local->smps_mode = IEEE80211_SMPS_OFF;
616
617         INIT_WORK(&local->dynamic_ps_enable_work,
618                   ieee80211_dynamic_ps_enable_work);
619         INIT_WORK(&local->dynamic_ps_disable_work,
620                   ieee80211_dynamic_ps_disable_work);
621         setup_timer(&local->dynamic_ps_timer,
622                     ieee80211_dynamic_ps_timer, (unsigned long) local);
623
624         INIT_WORK(&local->sched_scan_stopped_work,
625                   ieee80211_sched_scan_stopped_work);
626
627         spin_lock_init(&local->ack_status_lock);
628         idr_init(&local->ack_status_frames);
629
630         sta_info_init(local);
631
632         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
633                 skb_queue_head_init(&local->pending[i]);
634                 atomic_set(&local->agg_queue_stop[i], 0);
635         }
636         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
637                      (unsigned long)local);
638
639         tasklet_init(&local->tasklet,
640                      ieee80211_tasklet_handler,
641                      (unsigned long) local);
642
643         skb_queue_head_init(&local->skb_queue);
644         skb_queue_head_init(&local->skb_queue_unreliable);
645
646         ieee80211_led_names(local);
647
648         ieee80211_roc_setup(local);
649
650         return &local->hw;
651 }
652 EXPORT_SYMBOL(ieee80211_alloc_hw);
653
654 int ieee80211_register_hw(struct ieee80211_hw *hw)
655 {
656         struct ieee80211_local *local = hw_to_local(hw);
657         int result, i;
658         enum ieee80211_band band;
659         int channels, max_bitrates;
660         bool supp_ht, supp_vht;
661         netdev_features_t feature_whitelist;
662         struct cfg80211_chan_def dflt_chandef = {};
663         static const u32 cipher_suites[] = {
664                 /* keep WEP first, it may be removed below */
665                 WLAN_CIPHER_SUITE_WEP40,
666                 WLAN_CIPHER_SUITE_WEP104,
667                 WLAN_CIPHER_SUITE_TKIP,
668                 WLAN_CIPHER_SUITE_CCMP,
669
670                 /* keep last -- depends on hw flags! */
671                 WLAN_CIPHER_SUITE_AES_CMAC
672         };
673
674         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
675             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
676              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
677                 return -EINVAL;
678
679 #ifdef CONFIG_PM
680         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
681                 return -EINVAL;
682 #endif
683
684         if (!local->use_chanctx) {
685                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
686                         const struct ieee80211_iface_combination *comb;
687
688                         comb = &local->hw.wiphy->iface_combinations[i];
689
690                         if (comb->num_different_channels > 1)
691                                 return -EINVAL;
692                 }
693         } else {
694                 /*
695                  * WDS is currently prohibited when channel contexts are used
696                  * because there's no clear definition of which channel WDS
697                  * type interfaces use
698                  */
699                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
700                         return -EINVAL;
701
702                 /* DFS currently not supported with channel context drivers */
703                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
704                         const struct ieee80211_iface_combination *comb;
705
706                         comb = &local->hw.wiphy->iface_combinations[i];
707
708                         if (comb->radar_detect_widths)
709                                 return -EINVAL;
710                 }
711         }
712
713         /* Only HW csum features are currently compatible with mac80211 */
714         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
715                             NETIF_F_HW_CSUM;
716         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
717                 return -EINVAL;
718
719         if (hw->max_report_rates == 0)
720                 hw->max_report_rates = hw->max_rates;
721
722         local->rx_chains = 1;
723
724         /*
725          * generic code guarantees at least one band,
726          * set this very early because much code assumes
727          * that hw.conf.channel is assigned
728          */
729         channels = 0;
730         max_bitrates = 0;
731         supp_ht = false;
732         supp_vht = false;
733         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
734                 struct ieee80211_supported_band *sband;
735
736                 sband = local->hw.wiphy->bands[band];
737                 if (!sband)
738                         continue;
739
740                 if (!dflt_chandef.chan) {
741                         cfg80211_chandef_create(&dflt_chandef,
742                                                 &sband->channels[0],
743                                                 NL80211_CHAN_NO_HT);
744                         /* init channel we're on */
745                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
746                                 local->hw.conf.chandef = dflt_chandef;
747                                 local->_oper_chandef = dflt_chandef;
748                         }
749                         local->monitor_chandef = dflt_chandef;
750                 }
751
752                 channels += sband->n_channels;
753
754                 if (max_bitrates < sband->n_bitrates)
755                         max_bitrates = sband->n_bitrates;
756                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
757                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
758
759                 if (sband->ht_cap.ht_supported)
760                         local->rx_chains =
761                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
762                                     local->rx_chains);
763
764                 /* TODO: consider VHT for RX chains, hopefully it's the same */
765         }
766
767         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
768                                       sizeof(void *) * channels, GFP_KERNEL);
769         if (!local->int_scan_req)
770                 return -ENOMEM;
771
772         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
773                 if (!local->hw.wiphy->bands[band])
774                         continue;
775                 local->int_scan_req->rates[band] = (u32) -1;
776         }
777
778         /* if low-level driver supports AP, we also support VLAN */
779         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
780                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
781                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
782         }
783
784         /* mac80211 always supports monitor */
785         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
786         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
787
788         /* mac80211 doesn't support more than one IBSS interface right now */
789         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
790                 const struct ieee80211_iface_combination *c;
791                 int j;
792
793                 c = &hw->wiphy->iface_combinations[i];
794
795                 for (j = 0; j < c->n_limits; j++)
796                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
797                             c->limits[j].max > 1)
798                                 return -EINVAL;
799         }
800
801 #ifndef CONFIG_MAC80211_MESH
802         /* mesh depends on Kconfig, but drivers should set it if they want */
803         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
804 #endif
805
806         /* if the underlying driver supports mesh, mac80211 will (at least)
807          * provide routing of mesh authentication frames to userspace */
808         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
809                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
810
811         /* mac80211 supports control port protocol changing */
812         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
813
814         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
815                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
816         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
817                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
818
819         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
820              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
821              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
822
823         /*
824          * Calculate scan IE length -- we need this to alloc
825          * memory and to subtract from the driver limit. It
826          * includes the DS Params, (extended) supported rates, and HT
827          * information -- SSID is the driver's responsibility.
828          */
829         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
830                 3 /* DS Params */;
831         if (supp_ht)
832                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
833
834         if (supp_vht)
835                 local->scan_ies_len +=
836                         2 + sizeof(struct ieee80211_vht_cap);
837
838         if (!local->ops->hw_scan) {
839                 /* For hw_scan, driver needs to set these up. */
840                 local->hw.wiphy->max_scan_ssids = 4;
841                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
842         }
843
844         /*
845          * If the driver supports any scan IEs, then assume the
846          * limit includes the IEs mac80211 will add, otherwise
847          * leave it at zero and let the driver sort it out; we
848          * still pass our IEs to the driver but userspace will
849          * not be allowed to in that case.
850          */
851         if (local->hw.wiphy->max_scan_ie_len)
852                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
853
854         /* Set up cipher suites unless driver already did */
855         if (!local->hw.wiphy->cipher_suites) {
856                 local->hw.wiphy->cipher_suites = cipher_suites;
857                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
858                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
859                         local->hw.wiphy->n_cipher_suites--;
860         }
861         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
862                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
863                         local->hw.wiphy->cipher_suites += 2;
864                         local->hw.wiphy->n_cipher_suites -= 2;
865                 } else {
866                         u32 *suites;
867                         int r, w = 0;
868
869                         /* Filter out WEP */
870
871                         suites = kmemdup(
872                                 local->hw.wiphy->cipher_suites,
873                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
874                                 GFP_KERNEL);
875                         if (!suites) {
876                                 result = -ENOMEM;
877                                 goto fail_wiphy_register;
878                         }
879                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
880                                 u32 suite = local->hw.wiphy->cipher_suites[r];
881                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
882                                     suite == WLAN_CIPHER_SUITE_WEP104)
883                                         continue;
884                                 suites[w++] = suite;
885                         }
886                         local->hw.wiphy->cipher_suites = suites;
887                         local->hw.wiphy->n_cipher_suites = w;
888                         local->wiphy_ciphers_allocated = true;
889                 }
890         }
891
892         if (!local->ops->remain_on_channel)
893                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
894
895         /* mac80211 based drivers don't support internal TDLS setup */
896         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
897                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
898
899         result = wiphy_register(local->hw.wiphy);
900         if (result < 0)
901                 goto fail_wiphy_register;
902
903         /*
904          * We use the number of queues for feature tests (QoS, HT) internally
905          * so restrict them appropriately.
906          */
907         if (hw->queues > IEEE80211_MAX_QUEUES)
908                 hw->queues = IEEE80211_MAX_QUEUES;
909
910         local->workqueue =
911                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
912         if (!local->workqueue) {
913                 result = -ENOMEM;
914                 goto fail_workqueue;
915         }
916
917         /*
918          * The hardware needs headroom for sending the frame,
919          * and we need some headroom for passing the frame to monitor
920          * interfaces, but never both at the same time.
921          */
922         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
923                                    IEEE80211_TX_STATUS_HEADROOM);
924
925         debugfs_hw_add(local);
926
927         /*
928          * if the driver doesn't specify a max listen interval we
929          * use 5 which should be a safe default
930          */
931         if (local->hw.max_listen_interval == 0)
932                 local->hw.max_listen_interval = 5;
933
934         local->hw.conf.listen_interval = local->hw.max_listen_interval;
935
936         local->dynamic_ps_forced_timeout = -1;
937
938         result = ieee80211_wep_init(local);
939         if (result < 0)
940                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
941                             result);
942
943         local->hw.conf.flags = IEEE80211_CONF_IDLE;
944
945         ieee80211_led_init(local);
946
947         rtnl_lock();
948
949         result = ieee80211_init_rate_ctrl_alg(local,
950                                               hw->rate_control_algorithm);
951         if (result < 0) {
952                 wiphy_debug(local->hw.wiphy,
953                             "Failed to initialize rate control algorithm\n");
954                 goto fail_rate;
955         }
956
957         /* add one default STA interface if supported */
958         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
959                 result = ieee80211_if_add(local, "wlan%d", NULL,
960                                           NL80211_IFTYPE_STATION, NULL);
961                 if (result)
962                         wiphy_warn(local->hw.wiphy,
963                                    "Failed to add default virtual iface\n");
964         }
965
966         rtnl_unlock();
967
968         local->network_latency_notifier.notifier_call =
969                 ieee80211_max_network_latency;
970         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
971                                      &local->network_latency_notifier);
972         if (result) {
973                 rtnl_lock();
974                 goto fail_pm_qos;
975         }
976
977 #ifdef CONFIG_INET
978         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
979         result = register_inetaddr_notifier(&local->ifa_notifier);
980         if (result)
981                 goto fail_ifa;
982 #endif
983
984 #if IS_ENABLED(CONFIG_IPV6)
985         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
986         result = register_inet6addr_notifier(&local->ifa6_notifier);
987         if (result)
988                 goto fail_ifa6;
989 #endif
990
991         return 0;
992
993 #if IS_ENABLED(CONFIG_IPV6)
994  fail_ifa6:
995 #ifdef CONFIG_INET
996         unregister_inetaddr_notifier(&local->ifa_notifier);
997 #endif
998 #endif
999 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1000  fail_ifa:
1001         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1002                                &local->network_latency_notifier);
1003         rtnl_lock();
1004 #endif
1005  fail_pm_qos:
1006         ieee80211_led_exit(local);
1007         ieee80211_remove_interfaces(local);
1008  fail_rate:
1009         rtnl_unlock();
1010         ieee80211_wep_free(local);
1011         sta_info_stop(local);
1012         destroy_workqueue(local->workqueue);
1013  fail_workqueue:
1014         wiphy_unregister(local->hw.wiphy);
1015  fail_wiphy_register:
1016         if (local->wiphy_ciphers_allocated)
1017                 kfree(local->hw.wiphy->cipher_suites);
1018         kfree(local->int_scan_req);
1019         return result;
1020 }
1021 EXPORT_SYMBOL(ieee80211_register_hw);
1022
1023 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1024 {
1025         struct ieee80211_local *local = hw_to_local(hw);
1026
1027         tasklet_kill(&local->tx_pending_tasklet);
1028         tasklet_kill(&local->tasklet);
1029
1030         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1031                                &local->network_latency_notifier);
1032 #ifdef CONFIG_INET
1033         unregister_inetaddr_notifier(&local->ifa_notifier);
1034 #endif
1035 #if IS_ENABLED(CONFIG_IPV6)
1036         unregister_inet6addr_notifier(&local->ifa6_notifier);
1037 #endif
1038
1039         rtnl_lock();
1040
1041         /*
1042          * At this point, interface list manipulations are fine
1043          * because the driver cannot be handing us frames any
1044          * more and the tasklet is killed.
1045          */
1046         ieee80211_remove_interfaces(local);
1047
1048         rtnl_unlock();
1049
1050         cancel_work_sync(&local->restart_work);
1051         cancel_work_sync(&local->reconfig_filter);
1052         flush_work(&local->sched_scan_stopped_work);
1053
1054         ieee80211_clear_tx_pending(local);
1055         rate_control_deinitialize(local);
1056
1057         if (skb_queue_len(&local->skb_queue) ||
1058             skb_queue_len(&local->skb_queue_unreliable))
1059                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1060         skb_queue_purge(&local->skb_queue);
1061         skb_queue_purge(&local->skb_queue_unreliable);
1062
1063         destroy_workqueue(local->workqueue);
1064         wiphy_unregister(local->hw.wiphy);
1065         sta_info_stop(local);
1066         ieee80211_wep_free(local);
1067         ieee80211_led_exit(local);
1068         kfree(local->int_scan_req);
1069 }
1070 EXPORT_SYMBOL(ieee80211_unregister_hw);
1071
1072 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1073 {
1074         WARN_ONCE(1, "Have pending ack frames!\n");
1075         kfree_skb(p);
1076         return 0;
1077 }
1078
1079 void ieee80211_free_hw(struct ieee80211_hw *hw)
1080 {
1081         struct ieee80211_local *local = hw_to_local(hw);
1082
1083         mutex_destroy(&local->iflist_mtx);
1084         mutex_destroy(&local->mtx);
1085
1086         if (local->wiphy_ciphers_allocated)
1087                 kfree(local->hw.wiphy->cipher_suites);
1088
1089         idr_for_each(&local->ack_status_frames,
1090                      ieee80211_free_ack_frame, NULL);
1091         idr_destroy(&local->ack_status_frames);
1092
1093         wiphy_free(local->hw.wiphy);
1094 }
1095 EXPORT_SYMBOL(ieee80211_free_hw);
1096
1097 static int __init ieee80211_init(void)
1098 {
1099         struct sk_buff *skb;
1100         int ret;
1101
1102         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1103         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1104                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1105
1106         ret = rc80211_minstrel_init();
1107         if (ret)
1108                 return ret;
1109
1110         ret = rc80211_minstrel_ht_init();
1111         if (ret)
1112                 goto err_minstrel;
1113
1114         ret = rc80211_pid_init();
1115         if (ret)
1116                 goto err_pid;
1117
1118         ret = ieee80211_iface_init();
1119         if (ret)
1120                 goto err_netdev;
1121
1122         return 0;
1123  err_netdev:
1124         rc80211_pid_exit();
1125  err_pid:
1126         rc80211_minstrel_ht_exit();
1127  err_minstrel:
1128         rc80211_minstrel_exit();
1129
1130         return ret;
1131 }
1132
1133 static void __exit ieee80211_exit(void)
1134 {
1135         rc80211_pid_exit();
1136         rc80211_minstrel_ht_exit();
1137         rc80211_minstrel_exit();
1138
1139         ieee80211s_stop();
1140
1141         ieee80211_iface_exit();
1142
1143         rcu_barrier();
1144 }
1145
1146
1147 subsys_initcall(ieee80211_init);
1148 module_exit(ieee80211_exit);
1149
1150 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1151 MODULE_LICENSE("GPL");