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Linux 3.6-rc6
[linux/fpc-iii.git] / net / mac80211 / main.c
blobc26e231c733af85d66fba73821ee877ca4338912
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35
36 static struct lock_class_key ieee80211_rx_skb_queue_class;
37
38 void ieee80211_configure_filter(struct ieee80211_local *local)
39 {
40 u64 mc;
41 unsigned int changed_flags;
42 unsigned int new_flags = 0;
43
44 if (atomic_read(&local->iff_promiscs))
45 new_flags |= FIF_PROMISC_IN_BSS;
46
47 if (atomic_read(&local->iff_allmultis))
48 new_flags |= FIF_ALLMULTI;
49
50 if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
51 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
52 new_flags |= FIF_BCN_PRBRESP_PROMISC;
53
54 if (local->fif_probe_req || local->probe_req_reg)
55 new_flags |= FIF_PROBE_REQ;
56
57 if (local->fif_fcsfail)
58 new_flags |= FIF_FCSFAIL;
59
60 if (local->fif_plcpfail)
61 new_flags |= FIF_PLCPFAIL;
62
63 if (local->fif_control)
64 new_flags |= FIF_CONTROL;
65
66 if (local->fif_other_bss)
67 new_flags |= FIF_OTHER_BSS;
68
69 if (local->fif_pspoll)
70 new_flags |= FIF_PSPOLL;
71
72 spin_lock_bh(&local->filter_lock);
73 changed_flags = local->filter_flags ^ new_flags;
74
75 mc = drv_prepare_multicast(local, &local->mc_list);
76 spin_unlock_bh(&local->filter_lock);
77
78 /* be a bit nasty */
79 new_flags |= (1<<31);
80
81 drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83 WARN_ON(new_flags & (1<<31));
84
85 local->filter_flags = new_flags & ~(1<<31);
86 }
87
88 static void ieee80211_reconfig_filter(struct work_struct *work)
89 {
90 struct ieee80211_local *local =
91 container_of(work, struct ieee80211_local, reconfig_filter);
92
93 ieee80211_configure_filter(local);
94 }
95
96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97 {
98 struct ieee80211_channel *chan;
99 int ret = 0;
100 int power;
101 enum nl80211_channel_type channel_type;
102 u32 offchannel_flag;
103
104 might_sleep();
105
106 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
107 if (local->scan_channel) {
108 chan = local->scan_channel;
109 /* If scanning on oper channel, use whatever channel-type
110 * is currently in use.
111 */
112 if (chan == local->oper_channel)
113 channel_type = local->_oper_channel_type;
114 else
115 channel_type = NL80211_CHAN_NO_HT;
116 } else if (local->tmp_channel) {
117 chan = local->tmp_channel;
118 channel_type = 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 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
127 else
128 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
129
130 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
131
132 if (offchannel_flag || chan != local->hw.conf.channel ||
133 channel_type != local->hw.conf.channel_type) {
134 local->hw.conf.channel = chan;
135 local->hw.conf.channel_type = channel_type;
136 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
137 }
138
139 if (!conf_is_ht(&local->hw.conf)) {
140 /*
141 * mac80211.h documents that this is only valid
142 * when the channel is set to an HT type, and
143 * that otherwise STATIC is used.
144 */
145 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
146 } else if (local->hw.conf.smps_mode != local->smps_mode) {
147 local->hw.conf.smps_mode = local->smps_mode;
148 changed |= IEEE80211_CONF_CHANGE_SMPS;
149 }
150
151 if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
152 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
153 test_bit(SCAN_HW_SCANNING, &local->scanning))
154 power = chan->max_power;
155 else
156 power = local->power_constr_level ?
157 min(chan->max_power,
158 (chan->max_reg_power - local->power_constr_level)) :
159 chan->max_power;
160
161 if (local->user_power_level >= 0)
162 power = min(power, local->user_power_level);
163
164 if (local->hw.conf.power_level != power) {
165 changed |= IEEE80211_CONF_CHANGE_POWER;
166 local->hw.conf.power_level = power;
167 }
168
169 if (changed && local->open_count) {
170 ret = drv_config(local, changed);
171 /*
172 * Goal:
173 * HW reconfiguration should never fail, the driver has told
174 * us what it can support so it should live up to that promise.
175 *
176 * Current status:
177 * rfkill is not integrated with mac80211 and a
178 * configuration command can thus fail if hardware rfkill
179 * is enabled
180 *
181 * FIXME: integrate rfkill with mac80211 and then add this
182 * WARN_ON() back
183 *
184 */
185 /* WARN_ON(ret); */
186 }
187
188 return ret;
189 }
190
191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
192 u32 changed)
193 {
194 struct ieee80211_local *local = sdata->local;
195 static const u8 zero[ETH_ALEN] = { 0 };
196
197 if (!changed)
198 return;
199
200 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
201 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
202 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
203 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
204 else if (sdata->vif.type == NL80211_IFTYPE_AP)
205 sdata->vif.bss_conf.bssid = sdata->vif.addr;
206 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
207 sdata->vif.bss_conf.bssid = NULL;
208 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
209 sdata->vif.bss_conf.bssid = zero;
210 } else {
211 WARN_ON(1);
212 return;
213 }
214
215 switch (sdata->vif.type) {
216 case NL80211_IFTYPE_AP:
217 case NL80211_IFTYPE_ADHOC:
218 case NL80211_IFTYPE_WDS:
219 case NL80211_IFTYPE_MESH_POINT:
220 break;
221 default:
222 /* do not warn to simplify caller in scan.c */
223 changed &= ~BSS_CHANGED_BEACON_ENABLED;
224 if (WARN_ON(changed & BSS_CHANGED_BEACON))
225 return;
226 break;
227 }
228
229 if (changed & BSS_CHANGED_BEACON_ENABLED) {
230 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
231 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
232 sdata->vif.bss_conf.enable_beacon = false;
233 } else {
234 /*
235 * Beacon should be enabled, but AP mode must
236 * check whether there is a beacon configured.
237 */
238 switch (sdata->vif.type) {
239 case NL80211_IFTYPE_AP:
240 sdata->vif.bss_conf.enable_beacon =
241 !!sdata->u.ap.beacon;
242 break;
243 case NL80211_IFTYPE_ADHOC:
244 sdata->vif.bss_conf.enable_beacon =
245 !!sdata->u.ibss.presp;
246 break;
247 #ifdef CONFIG_MAC80211_MESH
248 case NL80211_IFTYPE_MESH_POINT:
249 sdata->vif.bss_conf.enable_beacon =
250 !!sdata->u.mesh.mesh_id_len;
251 break;
252 #endif
253 default:
254 /* not reached */
255 WARN_ON(1);
256 break;
257 }
258 }
259 }
260
261 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
262 }
263
264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
265 {
266 sdata->vif.bss_conf.use_cts_prot = false;
267 sdata->vif.bss_conf.use_short_preamble = false;
268 sdata->vif.bss_conf.use_short_slot = false;
269 return BSS_CHANGED_ERP_CTS_PROT |
270 BSS_CHANGED_ERP_PREAMBLE |
271 BSS_CHANGED_ERP_SLOT;
272 }
273
274 static void ieee80211_tasklet_handler(unsigned long data)
275 {
276 struct ieee80211_local *local = (struct ieee80211_local *) data;
277 struct sta_info *sta, *tmp;
278 struct skb_eosp_msg_data *eosp_data;
279 struct sk_buff *skb;
280
281 while ((skb = skb_dequeue(&local->skb_queue)) ||
282 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
283 switch (skb->pkt_type) {
284 case IEEE80211_RX_MSG:
285 /* Clear skb->pkt_type in order to not confuse kernel
286 * netstack. */
287 skb->pkt_type = 0;
288 ieee80211_rx(&local->hw, skb);
289 break;
290 case IEEE80211_TX_STATUS_MSG:
291 skb->pkt_type = 0;
292 ieee80211_tx_status(&local->hw, skb);
293 break;
294 case IEEE80211_EOSP_MSG:
295 eosp_data = (void *)skb->cb;
296 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
297 /* skip wrong virtual interface */
298 if (memcmp(eosp_data->iface,
299 sta->sdata->vif.addr, ETH_ALEN))
300 continue;
301 clear_sta_flag(sta, WLAN_STA_SP);
302 break;
303 }
304 dev_kfree_skb(skb);
305 break;
306 default:
307 WARN(1, "mac80211: Packet is of unknown type %d\n",
308 skb->pkt_type);
309 dev_kfree_skb(skb);
310 break;
311 }
312 }
313 }
314
315 static void ieee80211_restart_work(struct work_struct *work)
316 {
317 struct ieee80211_local *local =
318 container_of(work, struct ieee80211_local, restart_work);
319
320 /* wait for scan work complete */
321 flush_workqueue(local->workqueue);
322
323 mutex_lock(&local->mtx);
324 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
325 rcu_dereference_protected(local->sched_scan_sdata,
326 lockdep_is_held(&local->mtx)),
327 "%s called with hardware scan in progress\n", __func__);
328 mutex_unlock(&local->mtx);
329
330 rtnl_lock();
331 ieee80211_scan_cancel(local);
332 ieee80211_reconfig(local);
333 rtnl_unlock();
334 }
335
336 void ieee80211_restart_hw(struct ieee80211_hw *hw)
337 {
338 struct ieee80211_local *local = hw_to_local(hw);
339
340 trace_api_restart_hw(local);
341
342 wiphy_info(hw->wiphy,
343 "Hardware restart was requested\n");
344
345 /* use this reason, ieee80211_reconfig will unblock it */
346 ieee80211_stop_queues_by_reason(hw,
347 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
348
349 /*
350 * Stop all Rx during the reconfig. We don't want state changes
351 * or driver callbacks while this is in progress.
352 */
353 local->in_reconfig = true;
354 barrier();
355
356 schedule_work(&local->restart_work);
357 }
358 EXPORT_SYMBOL(ieee80211_restart_hw);
359
360 static void ieee80211_recalc_smps_work(struct work_struct *work)
361 {
362 struct ieee80211_local *local =
363 container_of(work, struct ieee80211_local, recalc_smps);
364
365 mutex_lock(&local->iflist_mtx);
366 ieee80211_recalc_smps(local);
367 mutex_unlock(&local->iflist_mtx);
368 }
369
370 #ifdef CONFIG_INET
371 static int ieee80211_ifa_changed(struct notifier_block *nb,
372 unsigned long data, void *arg)
373 {
374 struct in_ifaddr *ifa = arg;
375 struct ieee80211_local *local =
376 container_of(nb, struct ieee80211_local,
377 ifa_notifier);
378 struct net_device *ndev = ifa->ifa_dev->dev;
379 struct wireless_dev *wdev = ndev->ieee80211_ptr;
380 struct in_device *idev;
381 struct ieee80211_sub_if_data *sdata;
382 struct ieee80211_bss_conf *bss_conf;
383 struct ieee80211_if_managed *ifmgd;
384 int c = 0;
385
386 /* Make sure it's our interface that got changed */
387 if (!wdev)
388 return NOTIFY_DONE;
389
390 if (wdev->wiphy != local->hw.wiphy)
391 return NOTIFY_DONE;
392
393 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
394 bss_conf = &sdata->vif.bss_conf;
395
396 /* ARP filtering is only supported in managed mode */
397 if (sdata->vif.type != NL80211_IFTYPE_STATION)
398 return NOTIFY_DONE;
399
400 idev = __in_dev_get_rtnl(sdata->dev);
401 if (!idev)
402 return NOTIFY_DONE;
403
404 ifmgd = &sdata->u.mgd;
405 mutex_lock(&ifmgd->mtx);
406
407 /* Copy the addresses to the bss_conf list */
408 ifa = idev->ifa_list;
409 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
410 bss_conf->arp_addr_list[c] = ifa->ifa_address;
411 ifa = ifa->ifa_next;
412 c++;
413 }
414
415 /* If not all addresses fit the list, disable filtering */
416 if (ifa) {
417 sdata->arp_filter_state = false;
418 c = 0;
419 } else {
420 sdata->arp_filter_state = true;
421 }
422 bss_conf->arp_addr_cnt = c;
423
424 /* Configure driver only if associated (which also implies it is up) */
425 if (ifmgd->associated) {
426 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
427 ieee80211_bss_info_change_notify(sdata,
428 BSS_CHANGED_ARP_FILTER);
429 }
430
431 mutex_unlock(&ifmgd->mtx);
432
433 return NOTIFY_DONE;
434 }
435 #endif
436
437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
438 {
439 struct ieee80211_local *local =
440 container_of(napi, struct ieee80211_local, napi);
441
442 return local->ops->napi_poll(&local->hw, budget);
443 }
444
445 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
446 {
447 struct ieee80211_local *local = hw_to_local(hw);
448
449 napi_schedule(&local->napi);
450 }
451 EXPORT_SYMBOL(ieee80211_napi_schedule);
452
453 void ieee80211_napi_complete(struct ieee80211_hw *hw)
454 {
455 struct ieee80211_local *local = hw_to_local(hw);
456
457 napi_complete(&local->napi);
458 }
459 EXPORT_SYMBOL(ieee80211_napi_complete);
460
461 /* There isn't a lot of sense in it, but you can transmit anything you like */
462 static const struct ieee80211_txrx_stypes
463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
464 [NL80211_IFTYPE_ADHOC] = {
465 .tx = 0xffff,
466 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
467 BIT(IEEE80211_STYPE_AUTH >> 4) |
468 BIT(IEEE80211_STYPE_DEAUTH >> 4),
469 },
470 [NL80211_IFTYPE_STATION] = {
471 .tx = 0xffff,
472 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
473 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
474 },
475 [NL80211_IFTYPE_AP] = {
476 .tx = 0xffff,
477 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
478 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
479 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
480 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
481 BIT(IEEE80211_STYPE_AUTH >> 4) |
482 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
483 BIT(IEEE80211_STYPE_ACTION >> 4),
484 },
485 [NL80211_IFTYPE_AP_VLAN] = {
486 /* copy AP */
487 .tx = 0xffff,
488 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
489 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
490 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
491 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
492 BIT(IEEE80211_STYPE_AUTH >> 4) |
493 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
494 BIT(IEEE80211_STYPE_ACTION >> 4),
495 },
496 [NL80211_IFTYPE_P2P_CLIENT] = {
497 .tx = 0xffff,
498 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
499 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
500 },
501 [NL80211_IFTYPE_P2P_GO] = {
502 .tx = 0xffff,
503 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
504 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
505 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
506 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
507 BIT(IEEE80211_STYPE_AUTH >> 4) |
508 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
509 BIT(IEEE80211_STYPE_ACTION >> 4),
510 },
511 [NL80211_IFTYPE_MESH_POINT] = {
512 .tx = 0xffff,
513 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
514 BIT(IEEE80211_STYPE_AUTH >> 4) |
515 BIT(IEEE80211_STYPE_DEAUTH >> 4),
516 },
517 };
518
519 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
520 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
521 IEEE80211_HT_AMPDU_PARM_DENSITY,
522
523 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
524 IEEE80211_HT_CAP_MAX_AMSDU |
525 IEEE80211_HT_CAP_SGI_40),
526 .mcs = {
527 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
528 0xff, 0xff, 0xff, 0xff, 0xff, },
529 },
530 };
531
532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
533 const struct ieee80211_ops *ops)
534 {
535 struct ieee80211_local *local;
536 int priv_size, i;
537 struct wiphy *wiphy;
538
539 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
540 return NULL;
541
542 /* Ensure 32-byte alignment of our private data and hw private data.
543 * We use the wiphy priv data for both our ieee80211_local and for
544 * the driver's private data
545 *
546 * In memory it'll be like this:
547 *
548 * +-------------------------+
549 * | struct wiphy |
550 * +-------------------------+
551 * | struct ieee80211_local |
552 * +-------------------------+
553 * | driver's private data |
554 * +-------------------------+
555 *
556 */
557 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
558
559 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
560
561 if (!wiphy)
562 return NULL;
563
564 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
565
566 wiphy->privid = mac80211_wiphy_privid;
567
568 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
569 WIPHY_FLAG_4ADDR_AP |
570 WIPHY_FLAG_4ADDR_STATION |
571 WIPHY_FLAG_REPORTS_OBSS |
572 WIPHY_FLAG_OFFCHAN_TX;
573
574 if (ops->remain_on_channel)
575 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
576
577 wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
578 NL80211_FEATURE_HT_IBSS;
579
580 if (!ops->set_key)
581 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
582
583 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
584
585 local = wiphy_priv(wiphy);
586
587 local->hw.wiphy = wiphy;
588
589 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
590
591 BUG_ON(!ops->tx);
592 BUG_ON(!ops->start);
593 BUG_ON(!ops->stop);
594 BUG_ON(!ops->config);
595 BUG_ON(!ops->add_interface);
596 BUG_ON(!ops->remove_interface);
597 BUG_ON(!ops->configure_filter);
598 local->ops = ops;
599
600 /* set up some defaults */
601 local->hw.queues = 1;
602 local->hw.max_rates = 1;
603 local->hw.max_report_rates = 0;
604 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
605 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
606 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
607 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
608 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
609 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
610 IEEE80211_RADIOTAP_MCS_HAVE_GI |
611 IEEE80211_RADIOTAP_MCS_HAVE_BW;
612 local->user_power_level = -1;
613 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
614
615 INIT_LIST_HEAD(&local->interfaces);
616
617 __hw_addr_init(&local->mc_list);
618
619 mutex_init(&local->iflist_mtx);
620 mutex_init(&local->mtx);
621
622 mutex_init(&local->key_mtx);
623 spin_lock_init(&local->filter_lock);
624 spin_lock_init(&local->queue_stop_reason_lock);
625
626 /*
627 * The rx_skb_queue is only accessed from tasklets,
628 * but other SKB queues are used from within IRQ
629 * context. Therefore, this one needs a different
630 * locking class so our direct, non-irq-safe use of
631 * the queue's lock doesn't throw lockdep warnings.
632 */
633 skb_queue_head_init_class(&local->rx_skb_queue,
634 &ieee80211_rx_skb_queue_class);
635
636 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
637
638 INIT_WORK(&local->restart_work, ieee80211_restart_work);
639
640 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
641 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
642 local->smps_mode = IEEE80211_SMPS_OFF;
643
644 INIT_WORK(&local->dynamic_ps_enable_work,
645 ieee80211_dynamic_ps_enable_work);
646 INIT_WORK(&local->dynamic_ps_disable_work,
647 ieee80211_dynamic_ps_disable_work);
648 setup_timer(&local->dynamic_ps_timer,
649 ieee80211_dynamic_ps_timer, (unsigned long) local);
650
651 INIT_WORK(&local->sched_scan_stopped_work,
652 ieee80211_sched_scan_stopped_work);
653
654 spin_lock_init(&local->ack_status_lock);
655 idr_init(&local->ack_status_frames);
656 /* preallocate at least one entry */
657 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
658
659 sta_info_init(local);
660
661 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
662 skb_queue_head_init(&local->pending[i]);
663 atomic_set(&local->agg_queue_stop[i], 0);
664 }
665 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
666 (unsigned long)local);
667
668 tasklet_init(&local->tasklet,
669 ieee80211_tasklet_handler,
670 (unsigned long) local);
671
672 skb_queue_head_init(&local->skb_queue);
673 skb_queue_head_init(&local->skb_queue_unreliable);
674
675 /* init dummy netdev for use w/ NAPI */
676 init_dummy_netdev(&local->napi_dev);
677
678 ieee80211_led_names(local);
679
680 ieee80211_roc_setup(local);
681
682 return &local->hw;
683 }
684 EXPORT_SYMBOL(ieee80211_alloc_hw);
685
686 int ieee80211_register_hw(struct ieee80211_hw *hw)
687 {
688 struct ieee80211_local *local = hw_to_local(hw);
689 int result, i;
690 enum ieee80211_band band;
691 int channels, max_bitrates;
692 bool supp_ht, supp_vht;
693 netdev_features_t feature_whitelist;
694 static const u32 cipher_suites[] = {
695 /* keep WEP first, it may be removed below */
696 WLAN_CIPHER_SUITE_WEP40,
697 WLAN_CIPHER_SUITE_WEP104,
698 WLAN_CIPHER_SUITE_TKIP,
699 WLAN_CIPHER_SUITE_CCMP,
700
701 /* keep last -- depends on hw flags! */
702 WLAN_CIPHER_SUITE_AES_CMAC
703 };
704
705 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
706 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
707 local->hw.offchannel_tx_hw_queue >= local->hw.queues))
708 return -EINVAL;
709
710 #ifdef CONFIG_PM
711 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
712 (!local->ops->suspend || !local->ops->resume))
713 return -EINVAL;
714 #endif
715
716 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
717 return -EINVAL;
718
719 /* Only HW csum features are currently compatible with mac80211 */
720 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
721 NETIF_F_HW_CSUM;
722 if (WARN_ON(hw->netdev_features & ~feature_whitelist))
723 return -EINVAL;
724
725 if (hw->max_report_rates == 0)
726 hw->max_report_rates = hw->max_rates;
727
728 /*
729 * generic code guarantees at least one band,
730 * set this very early because much code assumes
731 * that hw.conf.channel is assigned
732 */
733 channels = 0;
734 max_bitrates = 0;
735 supp_ht = false;
736 supp_vht = false;
737 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
738 struct ieee80211_supported_band *sband;
739
740 sband = local->hw.wiphy->bands[band];
741 if (!sband)
742 continue;
743 if (!local->oper_channel) {
744 /* init channel we're on */
745 local->hw.conf.channel =
746 local->oper_channel = &sband->channels[0];
747 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
748 }
749 channels += sband->n_channels;
750
751 if (max_bitrates < sband->n_bitrates)
752 max_bitrates = sband->n_bitrates;
753 supp_ht = supp_ht || sband->ht_cap.ht_supported;
754 supp_vht = supp_vht || sband->vht_cap.vht_supported;
755 }
756
757 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
758 sizeof(void *) * channels, GFP_KERNEL);
759 if (!local->int_scan_req)
760 return -ENOMEM;
761
762 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
763 if (!local->hw.wiphy->bands[band])
764 continue;
765 local->int_scan_req->rates[band] = (u32) -1;
766 }
767
768 /* if low-level driver supports AP, we also support VLAN */
769 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
770 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
771 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
772 }
773
774 /* mac80211 always supports monitor */
775 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
776 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
777
778 /*
779 * mac80211 doesn't support more than 1 channel, and also not more
780 * than one IBSS interface
781 */
782 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
783 const struct ieee80211_iface_combination *c;
784 int j;
785
786 c = &hw->wiphy->iface_combinations[i];
787
788 if (c->num_different_channels > 1)
789 return -EINVAL;
790
791 for (j = 0; j < c->n_limits; j++)
792 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
793 c->limits[j].max > 1)
794 return -EINVAL;
795 }
796
797 #ifndef CONFIG_MAC80211_MESH
798 /* mesh depends on Kconfig, but drivers should set it if they want */
799 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
800 #endif
801
802 /* if the underlying driver supports mesh, mac80211 will (at least)
803 * provide routing of mesh authentication frames to userspace */
804 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
805 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
806
807 /* mac80211 supports control port protocol changing */
808 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
809
810 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
811 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
812 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
813 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
814
815 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
816 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
817 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
818
819 /*
820 * Calculate scan IE length -- we need this to alloc
821 * memory and to subtract from the driver limit. It
822 * includes the DS Params, (extended) supported rates, and HT
823 * information -- SSID is the driver's responsibility.
824 */
825 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
826 3 /* DS Params */;
827 if (supp_ht)
828 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
829
830 if (supp_vht)
831 local->scan_ies_len +=
832 2 + sizeof(struct ieee80211_vht_capabilities);
833
834 if (!local->ops->hw_scan) {
835 /* For hw_scan, driver needs to set these up. */
836 local->hw.wiphy->max_scan_ssids = 4;
837 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
838 }
839
840 /*
841 * If the driver supports any scan IEs, then assume the
842 * limit includes the IEs mac80211 will add, otherwise
843 * leave it at zero and let the driver sort it out; we
844 * still pass our IEs to the driver but userspace will
845 * not be allowed to in that case.
846 */
847 if (local->hw.wiphy->max_scan_ie_len)
848 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
849
850 /* Set up cipher suites unless driver already did */
851 if (!local->hw.wiphy->cipher_suites) {
852 local->hw.wiphy->cipher_suites = cipher_suites;
853 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
854 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
855 local->hw.wiphy->n_cipher_suites--;
856 }
857 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
858 if (local->hw.wiphy->cipher_suites == cipher_suites) {
859 local->hw.wiphy->cipher_suites += 2;
860 local->hw.wiphy->n_cipher_suites -= 2;
861 } else {
862 u32 *suites;
863 int r, w = 0;
864
865 /* Filter out WEP */
866
867 suites = kmemdup(
868 local->hw.wiphy->cipher_suites,
869 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
870 GFP_KERNEL);
871 if (!suites)
872 return -ENOMEM;
873 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
874 u32 suite = local->hw.wiphy->cipher_suites[r];
875 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
876 suite == WLAN_CIPHER_SUITE_WEP104)
877 continue;
878 suites[w++] = suite;
879 }
880 local->hw.wiphy->cipher_suites = suites;
881 local->hw.wiphy->n_cipher_suites = w;
882 local->wiphy_ciphers_allocated = true;
883 }
884 }
885
886 if (!local->ops->remain_on_channel)
887 local->hw.wiphy->max_remain_on_channel_duration = 5000;
888
889 if (local->ops->sched_scan_start)
890 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
891
892 /* mac80211 based drivers don't support internal TDLS setup */
893 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
894 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
895
896 result = wiphy_register(local->hw.wiphy);
897 if (result < 0)
898 goto fail_wiphy_register;
899
900 /*
901 * We use the number of queues for feature tests (QoS, HT) internally
902 * so restrict them appropriately.
903 */
904 if (hw->queues > IEEE80211_MAX_QUEUES)
905 hw->queues = IEEE80211_MAX_QUEUES;
906
907 local->workqueue =
908 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
909 if (!local->workqueue) {
910 result = -ENOMEM;
911 goto fail_workqueue;
912 }
913
914 /*
915 * The hardware needs headroom for sending the frame,
916 * and we need some headroom for passing the frame to monitor
917 * interfaces, but never both at the same time.
918 */
919 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
920 IEEE80211_TX_STATUS_HEADROOM);
921
922 debugfs_hw_add(local);
923
924 /*
925 * if the driver doesn't specify a max listen interval we
926 * use 5 which should be a safe default
927 */
928 if (local->hw.max_listen_interval == 0)
929 local->hw.max_listen_interval = 5;
930
931 local->hw.conf.listen_interval = local->hw.max_listen_interval;
932
933 local->dynamic_ps_forced_timeout = -1;
934
935 result = ieee80211_wep_init(local);
936 if (result < 0)
937 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
938 result);
939
940 ieee80211_led_init(local);
941
942 rtnl_lock();
943
944 result = ieee80211_init_rate_ctrl_alg(local,
945 hw->rate_control_algorithm);
946 if (result < 0) {
947 wiphy_debug(local->hw.wiphy,
948 "Failed to initialize rate control algorithm\n");
949 goto fail_rate;
950 }
951
952 /* add one default STA interface if supported */
953 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
954 result = ieee80211_if_add(local, "wlan%d", NULL,
955 NL80211_IFTYPE_STATION, NULL);
956 if (result)
957 wiphy_warn(local->hw.wiphy,
958 "Failed to add default virtual iface\n");
959 }
960
961 rtnl_unlock();
962
963 local->network_latency_notifier.notifier_call =
964 ieee80211_max_network_latency;
965 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
966 &local->network_latency_notifier);
967 if (result) {
968 rtnl_lock();
969 goto fail_pm_qos;
970 }
971
972 #ifdef CONFIG_INET
973 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
974 result = register_inetaddr_notifier(&local->ifa_notifier);
975 if (result)
976 goto fail_ifa;
977 #endif
978
979 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
980 local->hw.napi_weight);
981
982 return 0;
983
984 #ifdef CONFIG_INET
985 fail_ifa:
986 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
987 &local->network_latency_notifier);
988 rtnl_lock();
989 #endif
990 fail_pm_qos:
991 ieee80211_led_exit(local);
992 ieee80211_remove_interfaces(local);
993 fail_rate:
994 rtnl_unlock();
995 ieee80211_wep_free(local);
996 sta_info_stop(local);
997 destroy_workqueue(local->workqueue);
998 fail_workqueue:
999 wiphy_unregister(local->hw.wiphy);
1000 fail_wiphy_register:
1001 if (local->wiphy_ciphers_allocated)
1002 kfree(local->hw.wiphy->cipher_suites);
1003 kfree(local->int_scan_req);
1004 return result;
1005 }
1006 EXPORT_SYMBOL(ieee80211_register_hw);
1007
1008 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1009 {
1010 struct ieee80211_local *local = hw_to_local(hw);
1011
1012 tasklet_kill(&local->tx_pending_tasklet);
1013 tasklet_kill(&local->tasklet);
1014
1015 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1016 &local->network_latency_notifier);
1017 #ifdef CONFIG_INET
1018 unregister_inetaddr_notifier(&local->ifa_notifier);
1019 #endif
1020
1021 rtnl_lock();
1022
1023 /*
1024 * At this point, interface list manipulations are fine
1025 * because the driver cannot be handing us frames any
1026 * more and the tasklet is killed.
1027 */
1028 ieee80211_remove_interfaces(local);
1029
1030 rtnl_unlock();
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 }
1052 EXPORT_SYMBOL(ieee80211_unregister_hw);
1053
1054 static 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
1061 void 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 }
1077 EXPORT_SYMBOL(ieee80211_free_hw);
1078
1079 static 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
1115 static 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
1130 subsys_initcall(ieee80211_init);
1131 module_exit(ieee80211_exit);
1132
1133 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1134 MODULE_LICENSE("GPL");
Linux with added FPC-III support