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mac80211: minor cleanup to mesh state locking
[deliverable/linux.git] / net / mac80211 / main.c
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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
36static struct lock_class_key ieee80211_rx_skb_queue_class;
37
38void 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 || 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
87static 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/*
96 * Returns true if we are logically configured to be on
97 * the operating channel AND the hardware-conf is currently
98 * configured on the operating channel. Compares channel-type
99 * as well.
100 */
101bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
102{
103 struct ieee80211_channel *chan;
104 enum nl80211_channel_type channel_type;
105
106 /* This logic needs to match logic in ieee80211_hw_config */
107 if (local->scan_channel) {
108 chan = local->scan_channel;
109 /* If scanning on oper channel, use whatever channel-type
110 * is currently in use.
111 */
112 if (chan == local->oper_channel)
113 channel_type = local->_oper_channel_type;
114 else
115 channel_type = NL80211_CHAN_NO_HT;
116 } else if (local->tmp_channel) {
117 chan = local->tmp_channel;
118 channel_type = local->tmp_channel_type;
119 } else {
120 chan = local->oper_channel;
121 channel_type = local->_oper_channel_type;
122 }
123
124 if (chan != local->oper_channel ||
125 channel_type != local->_oper_channel_type)
126 return false;
127
128 /* Check current hardware-config against oper_channel. */
129 if (local->oper_channel != local->hw.conf.channel ||
130 local->_oper_channel_type != local->hw.conf.channel_type)
131 return false;
132
133 return true;
134}
135
136int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137{
138 struct ieee80211_channel *chan;
139 int ret = 0;
140 int power;
141 enum nl80211_channel_type channel_type;
142 u32 offchannel_flag;
143
144 might_sleep();
145
146 /* If this off-channel logic ever changes, ieee80211_on_oper_channel
147 * may need to change as well.
148 */
149 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
150 if (local->scan_channel) {
151 chan = local->scan_channel;
152 /* If scanning on oper channel, use whatever channel-type
153 * is currently in use.
154 */
155 if (chan == local->oper_channel)
156 channel_type = local->_oper_channel_type;
157 else
158 channel_type = NL80211_CHAN_NO_HT;
159 } else if (local->tmp_channel) {
160 chan = local->tmp_channel;
161 channel_type = local->tmp_channel_type;
162 } else {
163 chan = local->oper_channel;
164 channel_type = local->_oper_channel_type;
165 }
166
167 if (chan != local->oper_channel ||
168 channel_type != local->_oper_channel_type)
169 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
170 else
171 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
172
173 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
174
175 if (offchannel_flag || chan != local->hw.conf.channel ||
176 channel_type != local->hw.conf.channel_type) {
177 local->hw.conf.channel = chan;
178 local->hw.conf.channel_type = channel_type;
179 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
180 }
181
182 if (!conf_is_ht(&local->hw.conf)) {
183 /*
184 * mac80211.h documents that this is only valid
185 * when the channel is set to an HT type, and
186 * that otherwise STATIC is used.
187 */
188 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
189 } else if (local->hw.conf.smps_mode != local->smps_mode) {
190 local->hw.conf.smps_mode = local->smps_mode;
191 changed |= IEEE80211_CONF_CHANGE_SMPS;
192 }
193
194 if ((local->scanning & SCAN_SW_SCANNING) ||
195 (local->scanning & SCAN_HW_SCANNING))
196 power = chan->max_power;
197 else
198 power = local->power_constr_level ?
199 (chan->max_power - local->power_constr_level) :
200 chan->max_power;
201
202 if (local->user_power_level >= 0)
203 power = min(power, local->user_power_level);
204
205 if (local->hw.conf.power_level != power) {
206 changed |= IEEE80211_CONF_CHANGE_POWER;
207 local->hw.conf.power_level = power;
208 }
209
210 if (changed && local->open_count) {
211 ret = drv_config(local, changed);
212 /*
213 * Goal:
214 * HW reconfiguration should never fail, the driver has told
215 * us what it can support so it should live up to that promise.
216 *
217 * Current status:
218 * rfkill is not integrated with mac80211 and a
219 * configuration command can thus fail if hardware rfkill
220 * is enabled
221 *
222 * FIXME: integrate rfkill with mac80211 and then add this
223 * WARN_ON() back
224 *
225 */
226 /* WARN_ON(ret); */
227 }
228
229 return ret;
230}
231
232void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
233 u32 changed)
234{
235 struct ieee80211_local *local = sdata->local;
236 static const u8 zero[ETH_ALEN] = { 0 };
237
238 if (!changed)
239 return;
240
241 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
242 /*
243 * While not associated, claim a BSSID of all-zeroes
244 * so that drivers don't do any weird things with the
245 * BSSID at that time.
246 */
247 if (sdata->vif.bss_conf.assoc)
248 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
249 else
250 sdata->vif.bss_conf.bssid = zero;
251 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
252 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
253 else if (sdata->vif.type == NL80211_IFTYPE_AP)
254 sdata->vif.bss_conf.bssid = sdata->vif.addr;
255 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
256 sdata->vif.bss_conf.bssid = NULL;
257 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
258 sdata->vif.bss_conf.bssid = zero;
259 } else {
260 WARN_ON(1);
261 return;
262 }
263
264 switch (sdata->vif.type) {
265 case NL80211_IFTYPE_AP:
266 case NL80211_IFTYPE_ADHOC:
267 case NL80211_IFTYPE_WDS:
268 case NL80211_IFTYPE_MESH_POINT:
269 break;
270 default:
271 /* do not warn to simplify caller in scan.c */
272 changed &= ~BSS_CHANGED_BEACON_ENABLED;
273 if (WARN_ON(changed & BSS_CHANGED_BEACON))
274 return;
275 break;
276 }
277
278 if (changed & BSS_CHANGED_BEACON_ENABLED) {
279 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
280 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
281 sdata->vif.bss_conf.enable_beacon = false;
282 } else {
283 /*
284 * Beacon should be enabled, but AP mode must
285 * check whether there is a beacon configured.
286 */
287 switch (sdata->vif.type) {
288 case NL80211_IFTYPE_AP:
289 sdata->vif.bss_conf.enable_beacon =
290 !!sdata->u.ap.beacon;
291 break;
292 case NL80211_IFTYPE_ADHOC:
293 sdata->vif.bss_conf.enable_beacon =
294 !!sdata->u.ibss.presp;
295 break;
296#ifdef CONFIG_MAC80211_MESH
297 case NL80211_IFTYPE_MESH_POINT:
298 sdata->vif.bss_conf.enable_beacon =
299 !!sdata->u.mesh.mesh_id_len;
300 break;
301#endif
302 default:
303 /* not reached */
304 WARN_ON(1);
305 break;
306 }
307 }
308 }
309
310 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
311}
312
313u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
314{
315 sdata->vif.bss_conf.use_cts_prot = false;
316 sdata->vif.bss_conf.use_short_preamble = false;
317 sdata->vif.bss_conf.use_short_slot = false;
318 return BSS_CHANGED_ERP_CTS_PROT |
319 BSS_CHANGED_ERP_PREAMBLE |
320 BSS_CHANGED_ERP_SLOT;
321}
322
323static void ieee80211_tasklet_handler(unsigned long data)
324{
325 struct ieee80211_local *local = (struct ieee80211_local *) data;
326 struct sta_info *sta, *tmp;
327 struct skb_eosp_msg_data *eosp_data;
328 struct sk_buff *skb;
329
330 while ((skb = skb_dequeue(&local->skb_queue)) ||
331 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332 switch (skb->pkt_type) {
333 case IEEE80211_RX_MSG:
334 /* Clear skb->pkt_type in order to not confuse kernel
335 * netstack. */
336 skb->pkt_type = 0;
337 ieee80211_rx(local_to_hw(local), skb);
338 break;
339 case IEEE80211_TX_STATUS_MSG:
340 skb->pkt_type = 0;
341 ieee80211_tx_status(local_to_hw(local), skb);
342 break;
343 case IEEE80211_EOSP_MSG:
344 eosp_data = (void *)skb->cb;
345 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
346 /* skip wrong virtual interface */
347 if (memcmp(eosp_data->iface,
348 sta->sdata->vif.addr, ETH_ALEN))
349 continue;
350 clear_sta_flag(sta, WLAN_STA_SP);
351 break;
352 }
353 dev_kfree_skb(skb);
354 break;
355 default:
356 WARN(1, "mac80211: Packet is of unknown type %d\n",
357 skb->pkt_type);
358 dev_kfree_skb(skb);
359 break;
360 }
361 }
362}
363
364static void ieee80211_restart_work(struct work_struct *work)
365{
366 struct ieee80211_local *local =
367 container_of(work, struct ieee80211_local, restart_work);
368
369 /* wait for scan work complete */
370 flush_workqueue(local->workqueue);
371
372 mutex_lock(&local->mtx);
373 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
374 local->sched_scanning,
375 "%s called with hardware scan in progress\n", __func__);
376 mutex_unlock(&local->mtx);
377
378 rtnl_lock();
379 ieee80211_scan_cancel(local);
380 ieee80211_reconfig(local);
381 rtnl_unlock();
382}
383
384void ieee80211_restart_hw(struct ieee80211_hw *hw)
385{
386 struct ieee80211_local *local = hw_to_local(hw);
387
388 trace_api_restart_hw(local);
389
390 wiphy_info(hw->wiphy,
391 "Hardware restart was requested\n");
392
393 /* use this reason, ieee80211_reconfig will unblock it */
394 ieee80211_stop_queues_by_reason(hw,
395 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
396
397 schedule_work(&local->restart_work);
398}
399EXPORT_SYMBOL(ieee80211_restart_hw);
400
401static void ieee80211_recalc_smps_work(struct work_struct *work)
402{
403 struct ieee80211_local *local =
404 container_of(work, struct ieee80211_local, recalc_smps);
405
406 mutex_lock(&local->iflist_mtx);
407 ieee80211_recalc_smps(local);
408 mutex_unlock(&local->iflist_mtx);
409}
410
411#ifdef CONFIG_INET
412static int ieee80211_ifa_changed(struct notifier_block *nb,
413 unsigned long data, void *arg)
414{
415 struct in_ifaddr *ifa = arg;
416 struct ieee80211_local *local =
417 container_of(nb, struct ieee80211_local,
418 ifa_notifier);
419 struct net_device *ndev = ifa->ifa_dev->dev;
420 struct wireless_dev *wdev = ndev->ieee80211_ptr;
421 struct in_device *idev;
422 struct ieee80211_sub_if_data *sdata;
423 struct ieee80211_bss_conf *bss_conf;
424 struct ieee80211_if_managed *ifmgd;
425 int c = 0;
426
427 /* Make sure it's our interface that got changed */
428 if (!wdev)
429 return NOTIFY_DONE;
430
431 if (wdev->wiphy != local->hw.wiphy)
432 return NOTIFY_DONE;
433
434 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
435 bss_conf = &sdata->vif.bss_conf;
436
437 if (!ieee80211_sdata_running(sdata))
438 return NOTIFY_DONE;
439
440 /* ARP filtering is only supported in managed mode */
441 if (sdata->vif.type != NL80211_IFTYPE_STATION)
442 return NOTIFY_DONE;
443
444 idev = __in_dev_get_rtnl(sdata->dev);
445 if (!idev)
446 return NOTIFY_DONE;
447
448 ifmgd = &sdata->u.mgd;
449 mutex_lock(&ifmgd->mtx);
450
451 /* Copy the addresses to the bss_conf list */
452 ifa = idev->ifa_list;
453 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
454 bss_conf->arp_addr_list[c] = ifa->ifa_address;
455 ifa = ifa->ifa_next;
456 c++;
457 }
458
459 /* If not all addresses fit the list, disable filtering */
460 if (ifa) {
461 sdata->arp_filter_state = false;
462 c = 0;
463 } else {
464 sdata->arp_filter_state = true;
465 }
466 bss_conf->arp_addr_cnt = c;
467
468 /* Configure driver only if associated */
469 if (ifmgd->associated) {
470 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
471 ieee80211_bss_info_change_notify(sdata,
472 BSS_CHANGED_ARP_FILTER);
473 }
474
475 mutex_unlock(&ifmgd->mtx);
476
477 return NOTIFY_DONE;
478}
479#endif
480
481static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
482{
483 struct ieee80211_local *local =
484 container_of(napi, struct ieee80211_local, napi);
485
486 return local->ops->napi_poll(&local->hw, budget);
487}
488
489void ieee80211_napi_schedule(struct ieee80211_hw *hw)
490{
491 struct ieee80211_local *local = hw_to_local(hw);
492
493 napi_schedule(&local->napi);
494}
495EXPORT_SYMBOL(ieee80211_napi_schedule);
496
497void ieee80211_napi_complete(struct ieee80211_hw *hw)
498{
499 struct ieee80211_local *local = hw_to_local(hw);
500
501 napi_complete(&local->napi);
502}
503EXPORT_SYMBOL(ieee80211_napi_complete);
504
505/* There isn't a lot of sense in it, but you can transmit anything you like */
506static const struct ieee80211_txrx_stypes
507ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
508 [NL80211_IFTYPE_ADHOC] = {
509 .tx = 0xffff,
510 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
511 },
512 [NL80211_IFTYPE_STATION] = {
513 .tx = 0xffff,
514 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
515 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
516 },
517 [NL80211_IFTYPE_AP] = {
518 .tx = 0xffff,
519 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
520 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
521 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
522 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
523 BIT(IEEE80211_STYPE_AUTH >> 4) |
524 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
525 BIT(IEEE80211_STYPE_ACTION >> 4),
526 },
527 [NL80211_IFTYPE_AP_VLAN] = {
528 /* copy AP */
529 .tx = 0xffff,
530 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
531 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
532 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
533 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
534 BIT(IEEE80211_STYPE_AUTH >> 4) |
535 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
536 BIT(IEEE80211_STYPE_ACTION >> 4),
537 },
538 [NL80211_IFTYPE_P2P_CLIENT] = {
539 .tx = 0xffff,
540 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
541 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
542 },
543 [NL80211_IFTYPE_P2P_GO] = {
544 .tx = 0xffff,
545 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
546 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
547 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
548 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
549 BIT(IEEE80211_STYPE_AUTH >> 4) |
550 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
551 BIT(IEEE80211_STYPE_ACTION >> 4),
552 },
553 [NL80211_IFTYPE_MESH_POINT] = {
554 .tx = 0xffff,
555 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
556 BIT(IEEE80211_STYPE_AUTH >> 4) |
557 BIT(IEEE80211_STYPE_DEAUTH >> 4),
558 },
559};
560
561struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
562 const struct ieee80211_ops *ops)
563{
564 struct ieee80211_local *local;
565 int priv_size, i;
566 struct wiphy *wiphy;
567
568 /* Ensure 32-byte alignment of our private data and hw private data.
569 * We use the wiphy priv data for both our ieee80211_local and for
570 * the driver's private data
571 *
572 * In memory it'll be like this:
573 *
574 * +-------------------------+
575 * | struct wiphy |
576 * +-------------------------+
577 * | struct ieee80211_local |
578 * +-------------------------+
579 * | driver's private data |
580 * +-------------------------+
581 *
582 */
583 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
584
585 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
586
587 if (!wiphy)
588 return NULL;
589
590 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
591
592 wiphy->privid = mac80211_wiphy_privid;
593
594 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
595 WIPHY_FLAG_4ADDR_AP |
596 WIPHY_FLAG_4ADDR_STATION |
597 WIPHY_FLAG_REPORTS_OBSS;
598
599 wiphy->features = NL80211_FEATURE_SK_TX_STATUS;
600
601 if (!ops->set_key)
602 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
603
604 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
605
606 local = wiphy_priv(wiphy);
607
608 local->hw.wiphy = wiphy;
609
610 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
611
612 BUG_ON(!ops->tx && !ops->tx_frags);
613 BUG_ON(!ops->start);
614 BUG_ON(!ops->stop);
615 BUG_ON(!ops->config);
616 BUG_ON(!ops->add_interface);
617 BUG_ON(!ops->remove_interface);
618 BUG_ON(!ops->configure_filter);
619 local->ops = ops;
620
621 /* set up some defaults */
622 local->hw.queues = 1;
623 local->hw.max_rates = 1;
624 local->hw.max_report_rates = 0;
625 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
626 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
627 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
628 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
629 local->user_power_level = -1;
630 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
631 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
632
633 INIT_LIST_HEAD(&local->interfaces);
634
635 __hw_addr_init(&local->mc_list);
636
637 mutex_init(&local->iflist_mtx);
638 mutex_init(&local->mtx);
639
640 mutex_init(&local->key_mtx);
641 spin_lock_init(&local->filter_lock);
642 spin_lock_init(&local->queue_stop_reason_lock);
643
644 /*
645 * The rx_skb_queue is only accessed from tasklets,
646 * but other SKB queues are used from within IRQ
647 * context. Therefore, this one needs a different
648 * locking class so our direct, non-irq-safe use of
649 * the queue's lock doesn't throw lockdep warnings.
650 */
651 skb_queue_head_init_class(&local->rx_skb_queue,
652 &ieee80211_rx_skb_queue_class);
653
654 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
655
656 ieee80211_work_init(local);
657
658 INIT_WORK(&local->restart_work, ieee80211_restart_work);
659
660 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
661 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
662 local->smps_mode = IEEE80211_SMPS_OFF;
663
664 INIT_WORK(&local->dynamic_ps_enable_work,
665 ieee80211_dynamic_ps_enable_work);
666 INIT_WORK(&local->dynamic_ps_disable_work,
667 ieee80211_dynamic_ps_disable_work);
668 setup_timer(&local->dynamic_ps_timer,
669 ieee80211_dynamic_ps_timer, (unsigned long) local);
670
671 INIT_WORK(&local->sched_scan_stopped_work,
672 ieee80211_sched_scan_stopped_work);
673
674 spin_lock_init(&local->ack_status_lock);
675 idr_init(&local->ack_status_frames);
676 /* preallocate at least one entry */
677 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
678
679 sta_info_init(local);
680
681 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
682 skb_queue_head_init(&local->pending[i]);
683 atomic_set(&local->agg_queue_stop[i], 0);
684 }
685 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
686 (unsigned long)local);
687
688 tasklet_init(&local->tasklet,
689 ieee80211_tasklet_handler,
690 (unsigned long) local);
691
692 skb_queue_head_init(&local->skb_queue);
693 skb_queue_head_init(&local->skb_queue_unreliable);
694
695 /* init dummy netdev for use w/ NAPI */
696 init_dummy_netdev(&local->napi_dev);
697
698 ieee80211_led_names(local);
699
700 ieee80211_hw_roc_setup(local);
701
702 return local_to_hw(local);
703}
704EXPORT_SYMBOL(ieee80211_alloc_hw);
705
706int ieee80211_register_hw(struct ieee80211_hw *hw)
707{
708 struct ieee80211_local *local = hw_to_local(hw);
709 int result, i;
710 enum ieee80211_band band;
711 int channels, max_bitrates;
712 bool supp_ht;
713 static const u32 cipher_suites[] = {
714 /* keep WEP first, it may be removed below */
715 WLAN_CIPHER_SUITE_WEP40,
716 WLAN_CIPHER_SUITE_WEP104,
717 WLAN_CIPHER_SUITE_TKIP,
718 WLAN_CIPHER_SUITE_CCMP,
719
720 /* keep last -- depends on hw flags! */
721 WLAN_CIPHER_SUITE_AES_CMAC
722 };
723
724 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
725#ifdef CONFIG_PM
726 && (!local->ops->suspend || !local->ops->resume)
727#endif
728 )
729 return -EINVAL;
730
731 if (hw->max_report_rates == 0)
732 hw->max_report_rates = hw->max_rates;
733
734 /*
735 * generic code guarantees at least one band,
736 * set this very early because much code assumes
737 * that hw.conf.channel is assigned
738 */
739 channels = 0;
740 max_bitrates = 0;
741 supp_ht = false;
742 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
743 struct ieee80211_supported_band *sband;
744
745 sband = local->hw.wiphy->bands[band];
746 if (!sband)
747 continue;
748 if (!local->oper_channel) {
749 /* init channel we're on */
750 local->hw.conf.channel =
751 local->oper_channel = &sband->channels[0];
752 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
753 }
754 channels += sband->n_channels;
755
756 if (max_bitrates < sband->n_bitrates)
757 max_bitrates = sband->n_bitrates;
758 supp_ht = supp_ht || sband->ht_cap.ht_supported;
759 }
760
761 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
762 sizeof(void *) * channels, GFP_KERNEL);
763 if (!local->int_scan_req)
764 return -ENOMEM;
765
766 /* if low-level driver supports AP, we also support VLAN */
767 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
768 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
769 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
770 }
771
772 /* mac80211 always supports monitor */
773 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
774 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
775
776 /*
777 * mac80211 doesn't support more than 1 channel, and also not more
778 * than one IBSS interface
779 */
780 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
781 const struct ieee80211_iface_combination *c;
782 int j;
783
784 c = &hw->wiphy->iface_combinations[i];
785
786 if (c->num_different_channels > 1)
787 return -EINVAL;
788
789 for (j = 0; j < c->n_limits; j++)
790 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
791 c->limits[j].max > 1)
792 return -EINVAL;
793 }
794
795#ifndef CONFIG_MAC80211_MESH
796 /* mesh depends on Kconfig, but drivers should set it if they want */
797 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
798#endif
799
800 /* if the underlying driver supports mesh, mac80211 will (at least)
801 * provide routing of mesh authentication frames to userspace */
802 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
803 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
804
805 /* mac80211 supports control port protocol changing */
806 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
807
808 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
809 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
810 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
811 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
812
813 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
814 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
815 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
816
817 /*
818 * Calculate scan IE length -- we need this to alloc
819 * memory and to subtract from the driver limit. It
820 * includes the DS Params, (extended) supported rates, and HT
821 * information -- SSID is the driver's responsibility.
822 */
823 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
824 3 /* DS Params */;
825 if (supp_ht)
826 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
827
828 if (!local->ops->hw_scan) {
829 /* For hw_scan, driver needs to set these up. */
830 local->hw.wiphy->max_scan_ssids = 4;
831 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
832 }
833
834 /*
835 * If the driver supports any scan IEs, then assume the
836 * limit includes the IEs mac80211 will add, otherwise
837 * leave it at zero and let the driver sort it out; we
838 * still pass our IEs to the driver but userspace will
839 * not be allowed to in that case.
840 */
841 if (local->hw.wiphy->max_scan_ie_len)
842 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
843
844 /* Set up cipher suites unless driver already did */
845 if (!local->hw.wiphy->cipher_suites) {
846 local->hw.wiphy->cipher_suites = cipher_suites;
847 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
848 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
849 local->hw.wiphy->n_cipher_suites--;
850 }
851 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
852 if (local->hw.wiphy->cipher_suites == cipher_suites) {
853 local->hw.wiphy->cipher_suites += 2;
854 local->hw.wiphy->n_cipher_suites -= 2;
855 } else {
856 u32 *suites;
857 int r, w = 0;
858
859 /* Filter out WEP */
860
861 suites = kmemdup(
862 local->hw.wiphy->cipher_suites,
863 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
864 GFP_KERNEL);
865 if (!suites)
866 return -ENOMEM;
867 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
868 u32 suite = local->hw.wiphy->cipher_suites[r];
869 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
870 suite == WLAN_CIPHER_SUITE_WEP104)
871 continue;
872 suites[w++] = suite;
873 }
874 local->hw.wiphy->cipher_suites = suites;
875 local->hw.wiphy->n_cipher_suites = w;
876 local->wiphy_ciphers_allocated = true;
877 }
878 }
879
880 if (!local->ops->remain_on_channel)
881 local->hw.wiphy->max_remain_on_channel_duration = 5000;
882
883 if (local->ops->sched_scan_start)
884 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
885
886 /* mac80211 based drivers don't support internal TDLS setup */
887 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
888 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
889
890 result = wiphy_register(local->hw.wiphy);
891 if (result < 0)
892 goto fail_wiphy_register;
893
894 /*
895 * We use the number of queues for feature tests (QoS, HT) internally
896 * so restrict them appropriately.
897 */
898 if (hw->queues > IEEE80211_MAX_QUEUES)
899 hw->queues = IEEE80211_MAX_QUEUES;
900
901 local->workqueue =
902 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
903 if (!local->workqueue) {
904 result = -ENOMEM;
905 goto fail_workqueue;
906 }
907
908 /*
909 * The hardware needs headroom for sending the frame,
910 * and we need some headroom for passing the frame to monitor
911 * interfaces, but never both at the same time.
912 */
913 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
914 IEEE80211_TX_STATUS_HEADROOM);
915
916 debugfs_hw_add(local);
917
918 /*
919 * if the driver doesn't specify a max listen interval we
920 * use 5 which should be a safe default
921 */
922 if (local->hw.max_listen_interval == 0)
923 local->hw.max_listen_interval = 5;
924
925 local->hw.conf.listen_interval = local->hw.max_listen_interval;
926
927 local->dynamic_ps_forced_timeout = -1;
928
929 result = ieee80211_wep_init(local);
930 if (result < 0)
931 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
932 result);
933
934 rtnl_lock();
935
936 result = ieee80211_init_rate_ctrl_alg(local,
937 hw->rate_control_algorithm);
938 if (result < 0) {
939 wiphy_debug(local->hw.wiphy,
940 "Failed to initialize rate control algorithm\n");
941 goto fail_rate;
942 }
943
944 /* add one default STA interface if supported */
945 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
946 result = ieee80211_if_add(local, "wlan%d", NULL,
947 NL80211_IFTYPE_STATION, NULL);
948 if (result)
949 wiphy_warn(local->hw.wiphy,
950 "Failed to add default virtual iface\n");
951 }
952
953 rtnl_unlock();
954
955 ieee80211_led_init(local);
956
957 local->network_latency_notifier.notifier_call =
958 ieee80211_max_network_latency;
959 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
960 &local->network_latency_notifier);
961 if (result) {
962 rtnl_lock();
963 goto fail_pm_qos;
964 }
965
966#ifdef CONFIG_INET
967 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
968 result = register_inetaddr_notifier(&local->ifa_notifier);
969 if (result)
970 goto fail_ifa;
971#endif
972
973 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
974 local->hw.napi_weight);
975
976 return 0;
977
978#ifdef CONFIG_INET
979 fail_ifa:
980 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
981 &local->network_latency_notifier);
982 rtnl_lock();
983#endif
984 fail_pm_qos:
985 ieee80211_led_exit(local);
986 ieee80211_remove_interfaces(local);
987 fail_rate:
988 rtnl_unlock();
989 ieee80211_wep_free(local);
990 sta_info_stop(local);
991 destroy_workqueue(local->workqueue);
992 fail_workqueue:
993 wiphy_unregister(local->hw.wiphy);
994 fail_wiphy_register:
995 if (local->wiphy_ciphers_allocated)
996 kfree(local->hw.wiphy->cipher_suites);
997 kfree(local->int_scan_req);
998 return result;
999}
1000EXPORT_SYMBOL(ieee80211_register_hw);
1001
1002void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1003{
1004 struct ieee80211_local *local = hw_to_local(hw);
1005
1006 tasklet_kill(&local->tx_pending_tasklet);
1007 tasklet_kill(&local->tasklet);
1008
1009 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1010 &local->network_latency_notifier);
1011#ifdef CONFIG_INET
1012 unregister_inetaddr_notifier(&local->ifa_notifier);
1013#endif
1014
1015 rtnl_lock();
1016
1017 /*
1018 * At this point, interface list manipulations are fine
1019 * because the driver cannot be handing us frames any
1020 * more and the tasklet is killed.
1021 */
1022 ieee80211_remove_interfaces(local);
1023
1024 rtnl_unlock();
1025
1026 /*
1027 * Now all work items will be gone, but the
1028 * timer might still be armed, so delete it
1029 */
1030 del_timer_sync(&local->work_timer);
1031
1032 cancel_work_sync(&local->restart_work);
1033 cancel_work_sync(&local->reconfig_filter);
1034
1035 ieee80211_clear_tx_pending(local);
1036 rate_control_deinitialize(local);
1037
1038 if (skb_queue_len(&local->skb_queue) ||
1039 skb_queue_len(&local->skb_queue_unreliable))
1040 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1041 skb_queue_purge(&local->skb_queue);
1042 skb_queue_purge(&local->skb_queue_unreliable);
1043 skb_queue_purge(&local->rx_skb_queue);
1044
1045 destroy_workqueue(local->workqueue);
1046 wiphy_unregister(local->hw.wiphy);
1047 sta_info_stop(local);
1048 ieee80211_wep_free(local);
1049 ieee80211_led_exit(local);
1050 kfree(local->int_scan_req);
1051}
1052EXPORT_SYMBOL(ieee80211_unregister_hw);
1053
1054static int ieee80211_free_ack_frame(int id, void *p, void *data)
1055{
1056 WARN_ONCE(1, "Have pending ack frames!\n");
1057 kfree_skb(p);
1058 return 0;
1059}
1060
1061void ieee80211_free_hw(struct ieee80211_hw *hw)
1062{
1063 struct ieee80211_local *local = hw_to_local(hw);
1064
1065 mutex_destroy(&local->iflist_mtx);
1066 mutex_destroy(&local->mtx);
1067
1068 if (local->wiphy_ciphers_allocated)
1069 kfree(local->hw.wiphy->cipher_suites);
1070
1071 idr_for_each(&local->ack_status_frames,
1072 ieee80211_free_ack_frame, NULL);
1073 idr_destroy(&local->ack_status_frames);
1074
1075 wiphy_free(local->hw.wiphy);
1076}
1077EXPORT_SYMBOL(ieee80211_free_hw);
1078
1079static int __init ieee80211_init(void)
1080{
1081 struct sk_buff *skb;
1082 int ret;
1083
1084 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1085 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1086 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1087
1088 ret = rc80211_minstrel_init();
1089 if (ret)
1090 return ret;
1091
1092 ret = rc80211_minstrel_ht_init();
1093 if (ret)
1094 goto err_minstrel;
1095
1096 ret = rc80211_pid_init();
1097 if (ret)
1098 goto err_pid;
1099
1100 ret = ieee80211_iface_init();
1101 if (ret)
1102 goto err_netdev;
1103
1104 return 0;
1105 err_netdev:
1106 rc80211_pid_exit();
1107 err_pid:
1108 rc80211_minstrel_ht_exit();
1109 err_minstrel:
1110 rc80211_minstrel_exit();
1111
1112 return ret;
1113}
1114
1115static void __exit ieee80211_exit(void)
1116{
1117 rc80211_pid_exit();
1118 rc80211_minstrel_ht_exit();
1119 rc80211_minstrel_exit();
1120
1121 if (mesh_allocated)
1122 ieee80211s_stop();
1123
1124 ieee80211_iface_exit();
1125
1126 rcu_barrier();
1127}
1128
1129
1130subsys_initcall(ieee80211_init);
1131module_exit(ieee80211_exit);
1132
1133MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1134MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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