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
ieee80211_configure_filter(struct ieee80211_local * local)38 void ieee80211_configure_filter(struct ieee80211_local *local)
39 {
40 u64 mc;
41 unsigned int changed_flags;
42 unsigned int new_flags = 0;
43
44 if (atomic_read(&local->iff_promiscs))
45 new_flags |= FIF_PROMISC_IN_BSS;
46
47 if (atomic_read(&local->iff_allmultis))
48 new_flags |= FIF_ALLMULTI;
49
50 if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning))
51 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53 if (local->fif_probe_req || local->probe_req_reg)
54 new_flags |= FIF_PROBE_REQ;
55
56 if (local->fif_fcsfail)
57 new_flags |= FIF_FCSFAIL;
58
59 if (local->fif_plcpfail)
60 new_flags |= FIF_PLCPFAIL;
61
62 if (local->fif_control)
63 new_flags |= FIF_CONTROL;
64
65 if (local->fif_other_bss)
66 new_flags |= FIF_OTHER_BSS;
67
68 if (local->fif_pspoll)
69 new_flags |= FIF_PSPOLL;
70
71 spin_lock_bh(&local->filter_lock);
72 changed_flags = local->filter_flags ^ new_flags;
73
74 mc = drv_prepare_multicast(local, &local->mc_list);
75 spin_unlock_bh(&local->filter_lock);
76
77 /* be a bit nasty */
78 new_flags |= (1<<31);
79
80 drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82 WARN_ON(new_flags & (1<<31));
83
84 local->filter_flags = new_flags & ~(1<<31);
85 }
86
ieee80211_reconfig_filter(struct work_struct * work)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
ieee80211_hw_config(struct ieee80211_local * local,u32 changed)95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
96 {
97 struct ieee80211_channel *chan;
98 int ret = 0;
99 int power;
100 enum nl80211_channel_type channel_type;
101 u32 offchannel_flag;
102
103 might_sleep();
104
105 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
106 if (local->scan_channel) {
107 chan = local->scan_channel;
108 /* If scanning on oper channel, use whatever channel-type
109 * is currently in use.
110 */
111 if (chan == local->oper_channel)
112 channel_type = local->_oper_channel_type;
113 else
114 channel_type = NL80211_CHAN_NO_HT;
115 } else if (local->tmp_channel) {
116 chan = local->tmp_channel;
117 channel_type = local->tmp_channel_type;
118 } else {
119 chan = local->oper_channel;
120 channel_type = local->_oper_channel_type;
121 }
122
123 if (chan != local->oper_channel ||
124 channel_type != local->_oper_channel_type)
125 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
126 else
127 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
128
129 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
130
131 if (offchannel_flag || chan != local->hw.conf.channel ||
132 channel_type != local->hw.conf.channel_type) {
133 local->hw.conf.channel = chan;
134 local->hw.conf.channel_type = channel_type;
135 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
136 }
137
138 if (!conf_is_ht(&local->hw.conf)) {
139 /*
140 * mac80211.h documents that this is only valid
141 * when the channel is set to an HT type, and
142 * that otherwise STATIC is used.
143 */
144 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
145 } else if (local->hw.conf.smps_mode != local->smps_mode) {
146 local->hw.conf.smps_mode = local->smps_mode;
147 changed |= IEEE80211_CONF_CHANGE_SMPS;
148 }
149
150 if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
151 test_bit(SCAN_HW_SCANNING, &local->scanning))
152 power = chan->max_power;
153 else
154 power = local->power_constr_level ?
155 min(chan->max_power,
156 (chan->max_reg_power - local->power_constr_level)) :
157 chan->max_power;
158
159 if (local->user_power_level >= 0)
160 power = min(power, local->user_power_level);
161
162 if (local->hw.conf.power_level != power) {
163 changed |= IEEE80211_CONF_CHANGE_POWER;
164 local->hw.conf.power_level = power;
165 }
166
167 if (changed && local->open_count) {
168 ret = drv_config(local, changed);
169 /*
170 * Goal:
171 * HW reconfiguration should never fail, the driver has told
172 * us what it can support so it should live up to that promise.
173 *
174 * Current status:
175 * rfkill is not integrated with mac80211 and a
176 * configuration command can thus fail if hardware rfkill
177 * is enabled
178 *
179 * FIXME: integrate rfkill with mac80211 and then add this
180 * WARN_ON() back
181 *
182 */
183 /* WARN_ON(ret); */
184 }
185
186 return ret;
187 }
188
ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)189 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
190 u32 changed)
191 {
192 struct ieee80211_local *local = sdata->local;
193 static const u8 zero[ETH_ALEN] = { 0 };
194
195 if (!changed)
196 return;
197
198 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
199 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
200 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
201 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
202 else if (sdata->vif.type == NL80211_IFTYPE_AP)
203 sdata->vif.bss_conf.bssid = sdata->vif.addr;
204 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
205 sdata->vif.bss_conf.bssid = NULL;
206 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
207 sdata->vif.bss_conf.bssid = zero;
208 } else {
209 WARN_ON(1);
210 return;
211 }
212
213 switch (sdata->vif.type) {
214 case NL80211_IFTYPE_AP:
215 case NL80211_IFTYPE_ADHOC:
216 case NL80211_IFTYPE_WDS:
217 case NL80211_IFTYPE_MESH_POINT:
218 break;
219 default:
220 /* do not warn to simplify caller in scan.c */
221 changed &= ~BSS_CHANGED_BEACON_ENABLED;
222 if (WARN_ON(changed & BSS_CHANGED_BEACON))
223 return;
224 break;
225 }
226
227 if (changed & BSS_CHANGED_BEACON_ENABLED) {
228 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
229 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
230 sdata->vif.bss_conf.enable_beacon = false;
231 } else {
232 /*
233 * Beacon should be enabled, but AP mode must
234 * check whether there is a beacon configured.
235 */
236 switch (sdata->vif.type) {
237 case NL80211_IFTYPE_AP:
238 sdata->vif.bss_conf.enable_beacon =
239 !!sdata->u.ap.beacon;
240 break;
241 case NL80211_IFTYPE_ADHOC:
242 sdata->vif.bss_conf.enable_beacon =
243 !!sdata->u.ibss.presp;
244 break;
245 #ifdef CONFIG_MAC80211_MESH
246 case NL80211_IFTYPE_MESH_POINT:
247 sdata->vif.bss_conf.enable_beacon =
248 !!sdata->u.mesh.mesh_id_len;
249 break;
250 #endif
251 default:
252 /* not reached */
253 WARN_ON(1);
254 break;
255 }
256 }
257 }
258
259 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
260 }
261
ieee80211_reset_erp_info(struct ieee80211_sub_if_data * sdata)262 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
263 {
264 sdata->vif.bss_conf.use_cts_prot = false;
265 sdata->vif.bss_conf.use_short_preamble = false;
266 sdata->vif.bss_conf.use_short_slot = false;
267 return BSS_CHANGED_ERP_CTS_PROT |
268 BSS_CHANGED_ERP_PREAMBLE |
269 BSS_CHANGED_ERP_SLOT;
270 }
271
ieee80211_tasklet_handler(unsigned long data)272 static void ieee80211_tasklet_handler(unsigned long data)
273 {
274 struct ieee80211_local *local = (struct ieee80211_local *) data;
275 struct sta_info *sta, *tmp;
276 struct skb_eosp_msg_data *eosp_data;
277 struct sk_buff *skb;
278
279 while ((skb = skb_dequeue(&local->skb_queue)) ||
280 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
281 switch (skb->pkt_type) {
282 case IEEE80211_RX_MSG:
283 /* Clear skb->pkt_type in order to not confuse kernel
284 * netstack. */
285 skb->pkt_type = 0;
286 ieee80211_rx(&local->hw, skb);
287 break;
288 case IEEE80211_TX_STATUS_MSG:
289 skb->pkt_type = 0;
290 ieee80211_tx_status(&local->hw, skb);
291 break;
292 case IEEE80211_EOSP_MSG:
293 eosp_data = (void *)skb->cb;
294 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
295 /* skip wrong virtual interface */
296 if (memcmp(eosp_data->iface,
297 sta->sdata->vif.addr, ETH_ALEN))
298 continue;
299 clear_sta_flag(sta, WLAN_STA_SP);
300 break;
301 }
302 dev_kfree_skb(skb);
303 break;
304 default:
305 WARN(1, "mac80211: Packet is of unknown type %d\n",
306 skb->pkt_type);
307 dev_kfree_skb(skb);
308 break;
309 }
310 }
311 }
312
ieee80211_restart_work(struct work_struct * work)313 static void ieee80211_restart_work(struct work_struct *work)
314 {
315 struct ieee80211_local *local =
316 container_of(work, struct ieee80211_local, restart_work);
317
318 /* wait for scan work complete */
319 flush_workqueue(local->workqueue);
320
321 mutex_lock(&local->mtx);
322 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
323 local->sched_scanning,
324 "%s called with hardware scan in progress\n", __func__);
325 mutex_unlock(&local->mtx);
326
327 rtnl_lock();
328 ieee80211_scan_cancel(local);
329 ieee80211_reconfig(local);
330 rtnl_unlock();
331 }
332
ieee80211_restart_hw(struct ieee80211_hw * hw)333 void ieee80211_restart_hw(struct ieee80211_hw *hw)
334 {
335 struct ieee80211_local *local = hw_to_local(hw);
336
337 trace_api_restart_hw(local);
338
339 wiphy_info(hw->wiphy,
340 "Hardware restart was requested\n");
341
342 /* use this reason, ieee80211_reconfig will unblock it */
343 ieee80211_stop_queues_by_reason(hw,
344 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
345
346 schedule_work(&local->restart_work);
347 }
348 EXPORT_SYMBOL(ieee80211_restart_hw);
349
ieee80211_recalc_smps_work(struct work_struct * work)350 static void ieee80211_recalc_smps_work(struct work_struct *work)
351 {
352 struct ieee80211_local *local =
353 container_of(work, struct ieee80211_local, recalc_smps);
354
355 mutex_lock(&local->iflist_mtx);
356 ieee80211_recalc_smps(local);
357 mutex_unlock(&local->iflist_mtx);
358 }
359
360 #ifdef CONFIG_INET
ieee80211_ifa_changed(struct notifier_block * nb,unsigned long data,void * arg)361 static int ieee80211_ifa_changed(struct notifier_block *nb,
362 unsigned long data, void *arg)
363 {
364 struct in_ifaddr *ifa = arg;
365 struct ieee80211_local *local =
366 container_of(nb, struct ieee80211_local,
367 ifa_notifier);
368 struct net_device *ndev = ifa->ifa_dev->dev;
369 struct wireless_dev *wdev = ndev->ieee80211_ptr;
370 struct in_device *idev;
371 struct ieee80211_sub_if_data *sdata;
372 struct ieee80211_bss_conf *bss_conf;
373 struct ieee80211_if_managed *ifmgd;
374 int c = 0;
375
376 /* Make sure it's our interface that got changed */
377 if (!wdev)
378 return NOTIFY_DONE;
379
380 if (wdev->wiphy != local->hw.wiphy)
381 return NOTIFY_DONE;
382
383 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
384 bss_conf = &sdata->vif.bss_conf;
385
386 /* ARP filtering is only supported in managed mode */
387 if (sdata->vif.type != NL80211_IFTYPE_STATION)
388 return NOTIFY_DONE;
389
390 idev = __in_dev_get_rtnl(sdata->dev);
391 if (!idev)
392 return NOTIFY_DONE;
393
394 ifmgd = &sdata->u.mgd;
395 mutex_lock(&ifmgd->mtx);
396
397 /* Copy the addresses to the bss_conf list */
398 ifa = idev->ifa_list;
399 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
400 bss_conf->arp_addr_list[c] = ifa->ifa_address;
401 ifa = ifa->ifa_next;
402 c++;
403 }
404
405 /* If not all addresses fit the list, disable filtering */
406 if (ifa) {
407 sdata->arp_filter_state = false;
408 c = 0;
409 } else {
410 sdata->arp_filter_state = true;
411 }
412 bss_conf->arp_addr_cnt = c;
413
414 /* Configure driver only if associated (which also implies it is up) */
415 if (ifmgd->associated) {
416 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
417 ieee80211_bss_info_change_notify(sdata,
418 BSS_CHANGED_ARP_FILTER);
419 }
420
421 mutex_unlock(&ifmgd->mtx);
422
423 return NOTIFY_DONE;
424 }
425 #endif
426
ieee80211_napi_poll(struct napi_struct * napi,int budget)427 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
428 {
429 struct ieee80211_local *local =
430 container_of(napi, struct ieee80211_local, napi);
431
432 return local->ops->napi_poll(&local->hw, budget);
433 }
434
ieee80211_napi_schedule(struct ieee80211_hw * hw)435 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
436 {
437 struct ieee80211_local *local = hw_to_local(hw);
438
439 napi_schedule(&local->napi);
440 }
441 EXPORT_SYMBOL(ieee80211_napi_schedule);
442
ieee80211_napi_complete(struct ieee80211_hw * hw)443 void ieee80211_napi_complete(struct ieee80211_hw *hw)
444 {
445 struct ieee80211_local *local = hw_to_local(hw);
446
447 napi_complete(&local->napi);
448 }
449 EXPORT_SYMBOL(ieee80211_napi_complete);
450
451 /* There isn't a lot of sense in it, but you can transmit anything you like */
452 static const struct ieee80211_txrx_stypes
453 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
454 [NL80211_IFTYPE_ADHOC] = {
455 .tx = 0xffff,
456 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
457 },
458 [NL80211_IFTYPE_STATION] = {
459 .tx = 0xffff,
460 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
461 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
462 },
463 [NL80211_IFTYPE_AP] = {
464 .tx = 0xffff,
465 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
466 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
467 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
468 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
469 BIT(IEEE80211_STYPE_AUTH >> 4) |
470 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
471 BIT(IEEE80211_STYPE_ACTION >> 4),
472 },
473 [NL80211_IFTYPE_AP_VLAN] = {
474 /* copy AP */
475 .tx = 0xffff,
476 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
477 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
478 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
479 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
480 BIT(IEEE80211_STYPE_AUTH >> 4) |
481 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
482 BIT(IEEE80211_STYPE_ACTION >> 4),
483 },
484 [NL80211_IFTYPE_P2P_CLIENT] = {
485 .tx = 0xffff,
486 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
487 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
488 },
489 [NL80211_IFTYPE_P2P_GO] = {
490 .tx = 0xffff,
491 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
492 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
493 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
494 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
495 BIT(IEEE80211_STYPE_AUTH >> 4) |
496 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
497 BIT(IEEE80211_STYPE_ACTION >> 4),
498 },
499 [NL80211_IFTYPE_MESH_POINT] = {
500 .tx = 0xffff,
501 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
502 BIT(IEEE80211_STYPE_AUTH >> 4) |
503 BIT(IEEE80211_STYPE_DEAUTH >> 4),
504 },
505 };
506
507 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
508 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
509 IEEE80211_HT_AMPDU_PARM_DENSITY,
510
511 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
512 IEEE80211_HT_CAP_MAX_AMSDU |
513 IEEE80211_HT_CAP_SGI_40),
514 .mcs = {
515 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
516 0xff, 0xff, 0xff, 0xff, 0xff, },
517 },
518 };
519
ieee80211_alloc_hw(size_t priv_data_len,const struct ieee80211_ops * ops)520 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
521 const struct ieee80211_ops *ops)
522 {
523 struct ieee80211_local *local;
524 int priv_size, i;
525 struct wiphy *wiphy;
526
527 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
528 return NULL;
529
530 /* Ensure 32-byte alignment of our private data and hw private data.
531 * We use the wiphy priv data for both our ieee80211_local and for
532 * the driver's private data
533 *
534 * In memory it'll be like this:
535 *
536 * +-------------------------+
537 * | struct wiphy |
538 * +-------------------------+
539 * | struct ieee80211_local |
540 * +-------------------------+
541 * | driver's private data |
542 * +-------------------------+
543 *
544 */
545 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
546
547 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
548
549 if (!wiphy)
550 return NULL;
551
552 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
553
554 wiphy->privid = mac80211_wiphy_privid;
555
556 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
557 WIPHY_FLAG_4ADDR_AP |
558 WIPHY_FLAG_4ADDR_STATION |
559 WIPHY_FLAG_REPORTS_OBSS |
560 WIPHY_FLAG_OFFCHAN_TX |
561 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
562
563 wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
564 NL80211_FEATURE_HT_IBSS;
565
566 if (!ops->set_key)
567 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
568
569 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
570
571 local = wiphy_priv(wiphy);
572
573 local->hw.wiphy = wiphy;
574
575 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
576
577 BUG_ON(!ops->tx && !ops->tx_frags);
578 BUG_ON(!ops->start);
579 BUG_ON(!ops->stop);
580 BUG_ON(!ops->config);
581 BUG_ON(!ops->add_interface);
582 BUG_ON(!ops->remove_interface);
583 BUG_ON(!ops->configure_filter);
584 local->ops = ops;
585
586 /* set up some defaults */
587 local->hw.queues = 1;
588 local->hw.max_rates = 1;
589 local->hw.max_report_rates = 0;
590 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
591 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
592 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
593 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
594 local->user_power_level = -1;
595 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
596
597 INIT_LIST_HEAD(&local->interfaces);
598
599 __hw_addr_init(&local->mc_list);
600
601 mutex_init(&local->iflist_mtx);
602 mutex_init(&local->mtx);
603
604 mutex_init(&local->key_mtx);
605 spin_lock_init(&local->filter_lock);
606 spin_lock_init(&local->queue_stop_reason_lock);
607
608 /*
609 * The rx_skb_queue is only accessed from tasklets,
610 * but other SKB queues are used from within IRQ
611 * context. Therefore, this one needs a different
612 * locking class so our direct, non-irq-safe use of
613 * the queue's lock doesn't throw lockdep warnings.
614 */
615 skb_queue_head_init_class(&local->rx_skb_queue,
616 &ieee80211_rx_skb_queue_class);
617
618 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
619
620 ieee80211_work_init(local);
621
622 INIT_WORK(&local->restart_work, ieee80211_restart_work);
623
624 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
625 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
626 local->smps_mode = IEEE80211_SMPS_OFF;
627
628 INIT_WORK(&local->dynamic_ps_enable_work,
629 ieee80211_dynamic_ps_enable_work);
630 INIT_WORK(&local->dynamic_ps_disable_work,
631 ieee80211_dynamic_ps_disable_work);
632 setup_timer(&local->dynamic_ps_timer,
633 ieee80211_dynamic_ps_timer, (unsigned long) local);
634
635 INIT_WORK(&local->sched_scan_stopped_work,
636 ieee80211_sched_scan_stopped_work);
637
638 spin_lock_init(&local->ack_status_lock);
639 idr_init(&local->ack_status_frames);
640 /* preallocate at least one entry */
641 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
642
643 sta_info_init(local);
644
645 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
646 skb_queue_head_init(&local->pending[i]);
647 atomic_set(&local->agg_queue_stop[i], 0);
648 }
649 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
650 (unsigned long)local);
651
652 tasklet_init(&local->tasklet,
653 ieee80211_tasklet_handler,
654 (unsigned long) local);
655
656 skb_queue_head_init(&local->skb_queue);
657 skb_queue_head_init(&local->skb_queue_unreliable);
658
659 /* init dummy netdev for use w/ NAPI */
660 init_dummy_netdev(&local->napi_dev);
661
662 ieee80211_led_names(local);
663
664 ieee80211_hw_roc_setup(local);
665
666 return &local->hw;
667 }
668 EXPORT_SYMBOL(ieee80211_alloc_hw);
669
ieee80211_register_hw(struct ieee80211_hw * hw)670 int ieee80211_register_hw(struct ieee80211_hw *hw)
671 {
672 struct ieee80211_local *local = hw_to_local(hw);
673 int result, i;
674 enum ieee80211_band band;
675 int channels, max_bitrates;
676 bool supp_ht;
677 static const u32 cipher_suites[] = {
678 /* keep WEP first, it may be removed below */
679 WLAN_CIPHER_SUITE_WEP40,
680 WLAN_CIPHER_SUITE_WEP104,
681 WLAN_CIPHER_SUITE_TKIP,
682 WLAN_CIPHER_SUITE_CCMP,
683
684 /* keep last -- depends on hw flags! */
685 WLAN_CIPHER_SUITE_AES_CMAC
686 };
687
688 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
689 #ifdef CONFIG_PM
690 && (!local->ops->suspend || !local->ops->resume)
691 #endif
692 )
693 return -EINVAL;
694
695 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
696 return -EINVAL;
697
698 if (hw->max_report_rates == 0)
699 hw->max_report_rates = hw->max_rates;
700
701 /*
702 * generic code guarantees at least one band,
703 * set this very early because much code assumes
704 * that hw.conf.channel is assigned
705 */
706 channels = 0;
707 max_bitrates = 0;
708 supp_ht = false;
709 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
710 struct ieee80211_supported_band *sband;
711
712 sband = local->hw.wiphy->bands[band];
713 if (!sband)
714 continue;
715 if (!local->oper_channel) {
716 /* init channel we're on */
717 local->hw.conf.channel =
718 local->oper_channel = &sband->channels[0];
719 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
720 }
721 channels += sband->n_channels;
722
723 if (max_bitrates < sband->n_bitrates)
724 max_bitrates = sband->n_bitrates;
725 supp_ht = supp_ht || sband->ht_cap.ht_supported;
726 }
727
728 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
729 sizeof(void *) * channels, GFP_KERNEL);
730 if (!local->int_scan_req)
731 return -ENOMEM;
732
733 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
734 if (!local->hw.wiphy->bands[band])
735 continue;
736 local->int_scan_req->rates[band] = (u32) -1;
737 }
738
739 /* if low-level driver supports AP, we also support VLAN */
740 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
741 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
742 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
743 }
744
745 /* mac80211 always supports monitor */
746 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
747 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
748
749 /*
750 * mac80211 doesn't support more than 1 channel, and also not more
751 * than one IBSS interface
752 */
753 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
754 const struct ieee80211_iface_combination *c;
755 int j;
756
757 c = &hw->wiphy->iface_combinations[i];
758
759 if (c->num_different_channels > 1)
760 return -EINVAL;
761
762 for (j = 0; j < c->n_limits; j++)
763 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
764 c->limits[j].max > 1)
765 return -EINVAL;
766 }
767
768 #ifndef CONFIG_MAC80211_MESH
769 /* mesh depends on Kconfig, but drivers should set it if they want */
770 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
771 #endif
772
773 /* if the underlying driver supports mesh, mac80211 will (at least)
774 * provide routing of mesh authentication frames to userspace */
775 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
776 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
777
778 /* mac80211 supports control port protocol changing */
779 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
780
781 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
782 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
783 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
784 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
785
786 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
787 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
788 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
789
790 /*
791 * Calculate scan IE length -- we need this to alloc
792 * memory and to subtract from the driver limit. It
793 * includes the DS Params, (extended) supported rates, and HT
794 * information -- SSID is the driver's responsibility.
795 */
796 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
797 3 /* DS Params */;
798 if (supp_ht)
799 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
800
801 if (!local->ops->hw_scan) {
802 /* For hw_scan, driver needs to set these up. */
803 local->hw.wiphy->max_scan_ssids = 4;
804 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
805 }
806
807 /*
808 * If the driver supports any scan IEs, then assume the
809 * limit includes the IEs mac80211 will add, otherwise
810 * leave it at zero and let the driver sort it out; we
811 * still pass our IEs to the driver but userspace will
812 * not be allowed to in that case.
813 */
814 if (local->hw.wiphy->max_scan_ie_len)
815 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
816
817 /* Set up cipher suites unless driver already did */
818 if (!local->hw.wiphy->cipher_suites) {
819 local->hw.wiphy->cipher_suites = cipher_suites;
820 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
821 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
822 local->hw.wiphy->n_cipher_suites--;
823 }
824 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
825 if (local->hw.wiphy->cipher_suites == cipher_suites) {
826 local->hw.wiphy->cipher_suites += 2;
827 local->hw.wiphy->n_cipher_suites -= 2;
828 } else {
829 u32 *suites;
830 int r, w = 0;
831
832 /* Filter out WEP */
833
834 suites = kmemdup(
835 local->hw.wiphy->cipher_suites,
836 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
837 GFP_KERNEL);
838 if (!suites)
839 return -ENOMEM;
840 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
841 u32 suite = local->hw.wiphy->cipher_suites[r];
842 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
843 suite == WLAN_CIPHER_SUITE_WEP104)
844 continue;
845 suites[w++] = suite;
846 }
847 local->hw.wiphy->cipher_suites = suites;
848 local->hw.wiphy->n_cipher_suites = w;
849 local->wiphy_ciphers_allocated = true;
850 }
851 }
852
853 if (!local->ops->remain_on_channel)
854 local->hw.wiphy->max_remain_on_channel_duration = 5000;
855
856 if (local->ops->sched_scan_start)
857 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
858
859 /* mac80211 based drivers don't support internal TDLS setup */
860 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
861 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
862
863 result = wiphy_register(local->hw.wiphy);
864 if (result < 0)
865 goto fail_wiphy_register;
866
867 /*
868 * We use the number of queues for feature tests (QoS, HT) internally
869 * so restrict them appropriately.
870 */
871 if (hw->queues > IEEE80211_MAX_QUEUES)
872 hw->queues = IEEE80211_MAX_QUEUES;
873
874 local->workqueue =
875 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
876 if (!local->workqueue) {
877 result = -ENOMEM;
878 goto fail_workqueue;
879 }
880
881 /*
882 * The hardware needs headroom for sending the frame,
883 * and we need some headroom for passing the frame to monitor
884 * interfaces, but never both at the same time.
885 */
886 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
887 IEEE80211_TX_STATUS_HEADROOM);
888
889 debugfs_hw_add(local);
890
891 /*
892 * if the driver doesn't specify a max listen interval we
893 * use 5 which should be a safe default
894 */
895 if (local->hw.max_listen_interval == 0)
896 local->hw.max_listen_interval = 5;
897
898 local->hw.conf.listen_interval = local->hw.max_listen_interval;
899
900 local->dynamic_ps_forced_timeout = -1;
901
902 result = ieee80211_wep_init(local);
903 if (result < 0)
904 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
905 result);
906
907 ieee80211_led_init(local);
908
909 rtnl_lock();
910
911 result = ieee80211_init_rate_ctrl_alg(local,
912 hw->rate_control_algorithm);
913 if (result < 0) {
914 wiphy_debug(local->hw.wiphy,
915 "Failed to initialize rate control algorithm\n");
916 goto fail_rate;
917 }
918
919 /* add one default STA interface if supported */
920 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
921 result = ieee80211_if_add(local, "wlan%d", NULL,
922 NL80211_IFTYPE_STATION, NULL);
923 if (result)
924 wiphy_warn(local->hw.wiphy,
925 "Failed to add default virtual iface\n");
926 }
927
928 rtnl_unlock();
929
930 local->network_latency_notifier.notifier_call =
931 ieee80211_max_network_latency;
932 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
933 &local->network_latency_notifier);
934 if (result) {
935 rtnl_lock();
936 goto fail_pm_qos;
937 }
938
939 #ifdef CONFIG_INET
940 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
941 result = register_inetaddr_notifier(&local->ifa_notifier);
942 if (result)
943 goto fail_ifa;
944 #endif
945
946 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
947 local->hw.napi_weight);
948
949 return 0;
950
951 #ifdef CONFIG_INET
952 fail_ifa:
953 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
954 &local->network_latency_notifier);
955 rtnl_lock();
956 #endif
957 fail_pm_qos:
958 ieee80211_led_exit(local);
959 ieee80211_remove_interfaces(local);
960 fail_rate:
961 rtnl_unlock();
962 ieee80211_wep_free(local);
963 sta_info_stop(local);
964 destroy_workqueue(local->workqueue);
965 fail_workqueue:
966 wiphy_unregister(local->hw.wiphy);
967 fail_wiphy_register:
968 if (local->wiphy_ciphers_allocated)
969 kfree(local->hw.wiphy->cipher_suites);
970 kfree(local->int_scan_req);
971 return result;
972 }
973 EXPORT_SYMBOL(ieee80211_register_hw);
974
ieee80211_unregister_hw(struct ieee80211_hw * hw)975 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
976 {
977 struct ieee80211_local *local = hw_to_local(hw);
978
979 tasklet_kill(&local->tx_pending_tasklet);
980 tasklet_kill(&local->tasklet);
981
982 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
983 &local->network_latency_notifier);
984 #ifdef CONFIG_INET
985 unregister_inetaddr_notifier(&local->ifa_notifier);
986 #endif
987
988 rtnl_lock();
989
990 /*
991 * At this point, interface list manipulations are fine
992 * because the driver cannot be handing us frames any
993 * more and the tasklet is killed.
994 */
995 ieee80211_remove_interfaces(local);
996
997 rtnl_unlock();
998
999 /*
1000 * Now all work items will be gone, but the
1001 * timer might still be armed, so delete it
1002 */
1003 del_timer_sync(&local->work_timer);
1004
1005 cancel_work_sync(&local->restart_work);
1006 cancel_work_sync(&local->reconfig_filter);
1007
1008 ieee80211_clear_tx_pending(local);
1009 rate_control_deinitialize(local);
1010
1011 if (skb_queue_len(&local->skb_queue) ||
1012 skb_queue_len(&local->skb_queue_unreliable))
1013 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1014 skb_queue_purge(&local->skb_queue);
1015 skb_queue_purge(&local->skb_queue_unreliable);
1016 skb_queue_purge(&local->rx_skb_queue);
1017
1018 destroy_workqueue(local->workqueue);
1019 wiphy_unregister(local->hw.wiphy);
1020 sta_info_stop(local);
1021 ieee80211_wep_free(local);
1022 ieee80211_led_exit(local);
1023 kfree(local->int_scan_req);
1024 }
1025 EXPORT_SYMBOL(ieee80211_unregister_hw);
1026
ieee80211_free_ack_frame(int id,void * p,void * data)1027 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1028 {
1029 WARN_ONCE(1, "Have pending ack frames!\n");
1030 kfree_skb(p);
1031 return 0;
1032 }
1033
ieee80211_free_hw(struct ieee80211_hw * hw)1034 void ieee80211_free_hw(struct ieee80211_hw *hw)
1035 {
1036 struct ieee80211_local *local = hw_to_local(hw);
1037
1038 mutex_destroy(&local->iflist_mtx);
1039 mutex_destroy(&local->mtx);
1040
1041 if (local->wiphy_ciphers_allocated)
1042 kfree(local->hw.wiphy->cipher_suites);
1043
1044 idr_for_each(&local->ack_status_frames,
1045 ieee80211_free_ack_frame, NULL);
1046 idr_destroy(&local->ack_status_frames);
1047
1048 wiphy_free(local->hw.wiphy);
1049 }
1050 EXPORT_SYMBOL(ieee80211_free_hw);
1051
ieee80211_init(void)1052 static int __init ieee80211_init(void)
1053 {
1054 struct sk_buff *skb;
1055 int ret;
1056
1057 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1058 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1059 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1060
1061 ret = rc80211_minstrel_init();
1062 if (ret)
1063 return ret;
1064
1065 ret = rc80211_minstrel_ht_init();
1066 if (ret)
1067 goto err_minstrel;
1068
1069 ret = rc80211_pid_init();
1070 if (ret)
1071 goto err_pid;
1072
1073 ret = ieee80211_iface_init();
1074 if (ret)
1075 goto err_netdev;
1076
1077 return 0;
1078 err_netdev:
1079 rc80211_pid_exit();
1080 err_pid:
1081 rc80211_minstrel_ht_exit();
1082 err_minstrel:
1083 rc80211_minstrel_exit();
1084
1085 return ret;
1086 }
1087
ieee80211_exit(void)1088 static void __exit ieee80211_exit(void)
1089 {
1090 rc80211_pid_exit();
1091 rc80211_minstrel_ht_exit();
1092 rc80211_minstrel_exit();
1093
1094 if (mesh_allocated)
1095 ieee80211s_stop();
1096
1097 ieee80211_iface_exit();
1098
1099 rcu_barrier();
1100 }
1101
1102
1103 subsys_initcall(ieee80211_init);
1104 module_exit(ieee80211_exit);
1105
1106 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1107 MODULE_LICENSE("GPL");
1108