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Linux 3.3-rc6
[linux/fpc-iii.git] / net / mac80211 / main.c
blobb142bd4c239096f51fbf0e79e9b507a2bf35d1d0
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 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53 if (local->fif_probe_req || local->probe_req_reg)
54 new_flags |= FIF_PROBE_REQ;
55
56 if (local->fif_fcsfail)
57 new_flags |= FIF_FCSFAIL;
58
59 if (local->fif_plcpfail)
60 new_flags |= FIF_PLCPFAIL;
61
62 if (local->fif_control)
63 new_flags |= FIF_CONTROL;
64
65 if (local->fif_other_bss)
66 new_flags |= FIF_OTHER_BSS;
67
68 if (local->fif_pspoll)
69 new_flags |= FIF_PSPOLL;
70
71 spin_lock_bh(&local->filter_lock);
72 changed_flags = local->filter_flags ^ new_flags;
73
74 mc = drv_prepare_multicast(local, &local->mc_list);
75 spin_unlock_bh(&local->filter_lock);
76
77 /* be a bit nasty */
78 new_flags |= (1<<31);
79
80 drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82 WARN_ON(new_flags & (1<<31));
83
84 local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89 struct ieee80211_local *local =
90 container_of(work, struct ieee80211_local, reconfig_filter);
91
92 ieee80211_configure_filter(local);
93 }
94
95 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 /* If this off-channel logic ever changes, ieee80211_on_oper_channel
106 * may need to change as well.
107 */
108 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109 if (local->scan_channel) {
110 chan = local->scan_channel;
111 /* If scanning on oper channel, use whatever channel-type
112 * is currently in use.
113 */
114 if (chan == local->oper_channel)
115 channel_type = local->_oper_channel_type;
116 else
117 channel_type = NL80211_CHAN_NO_HT;
118 } else if (local->tmp_channel) {
119 chan = local->tmp_channel;
120 channel_type = local->tmp_channel_type;
121 } else {
122 chan = local->oper_channel;
123 channel_type = local->_oper_channel_type;
124 }
125
126 if (chan != local->oper_channel ||
127 channel_type != local->_oper_channel_type)
128 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
129 else
130 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
131
132 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
133
134 if (offchannel_flag || chan != local->hw.conf.channel ||
135 channel_type != local->hw.conf.channel_type) {
136 local->hw.conf.channel = chan;
137 local->hw.conf.channel_type = channel_type;
138 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
139 }
140
141 if (!conf_is_ht(&local->hw.conf)) {
142 /*
143 * mac80211.h documents that this is only valid
144 * when the channel is set to an HT type, and
145 * that otherwise STATIC is used.
146 */
147 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
148 } else if (local->hw.conf.smps_mode != local->smps_mode) {
149 local->hw.conf.smps_mode = local->smps_mode;
150 changed |= IEEE80211_CONF_CHANGE_SMPS;
151 }
152
153 if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
154 test_bit(SCAN_HW_SCANNING, &local->scanning))
155 power = chan->max_power;
156 else
157 power = local->power_constr_level ?
158 (chan->max_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 /*
202 * While not associated, claim a BSSID of all-zeroes
203 * so that drivers don't do any weird things with the
204 * BSSID at that time.
205 */
206 if (sdata->vif.bss_conf.assoc)
207 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
208 else
209 sdata->vif.bss_conf.bssid = zero;
210 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
211 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
212 else if (sdata->vif.type == NL80211_IFTYPE_AP)
213 sdata->vif.bss_conf.bssid = sdata->vif.addr;
214 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
215 sdata->vif.bss_conf.bssid = NULL;
216 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
217 sdata->vif.bss_conf.bssid = zero;
218 } else {
219 WARN_ON(1);
220 return;
221 }
222
223 switch (sdata->vif.type) {
224 case NL80211_IFTYPE_AP:
225 case NL80211_IFTYPE_ADHOC:
226 case NL80211_IFTYPE_WDS:
227 case NL80211_IFTYPE_MESH_POINT:
228 break;
229 default:
230 /* do not warn to simplify caller in scan.c */
231 changed &= ~BSS_CHANGED_BEACON_ENABLED;
232 if (WARN_ON(changed & BSS_CHANGED_BEACON))
233 return;
234 break;
235 }
236
237 if (changed & BSS_CHANGED_BEACON_ENABLED) {
238 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
239 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
240 sdata->vif.bss_conf.enable_beacon = false;
241 } else {
242 /*
243 * Beacon should be enabled, but AP mode must
244 * check whether there is a beacon configured.
245 */
246 switch (sdata->vif.type) {
247 case NL80211_IFTYPE_AP:
248 sdata->vif.bss_conf.enable_beacon =
249 !!sdata->u.ap.beacon;
250 break;
251 case NL80211_IFTYPE_ADHOC:
252 sdata->vif.bss_conf.enable_beacon =
253 !!sdata->u.ibss.presp;
254 break;
255 #ifdef CONFIG_MAC80211_MESH
256 case NL80211_IFTYPE_MESH_POINT:
257 sdata->vif.bss_conf.enable_beacon =
258 !!sdata->u.mesh.mesh_id_len;
259 break;
260 #endif
261 default:
262 /* not reached */
263 WARN_ON(1);
264 break;
265 }
266 }
267 }
268
269 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
270 }
271
272 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
273 {
274 sdata->vif.bss_conf.use_cts_prot = false;
275 sdata->vif.bss_conf.use_short_preamble = false;
276 sdata->vif.bss_conf.use_short_slot = false;
277 return BSS_CHANGED_ERP_CTS_PROT |
278 BSS_CHANGED_ERP_PREAMBLE |
279 BSS_CHANGED_ERP_SLOT;
280 }
281
282 static void ieee80211_tasklet_handler(unsigned long data)
283 {
284 struct ieee80211_local *local = (struct ieee80211_local *) data;
285 struct sta_info *sta, *tmp;
286 struct skb_eosp_msg_data *eosp_data;
287 struct sk_buff *skb;
288
289 while ((skb = skb_dequeue(&local->skb_queue)) ||
290 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
291 switch (skb->pkt_type) {
292 case IEEE80211_RX_MSG:
293 /* Clear skb->pkt_type in order to not confuse kernel
294 * netstack. */
295 skb->pkt_type = 0;
296 ieee80211_rx(local_to_hw(local), skb);
297 break;
298 case IEEE80211_TX_STATUS_MSG:
299 skb->pkt_type = 0;
300 ieee80211_tx_status(local_to_hw(local), skb);
301 break;
302 case IEEE80211_EOSP_MSG:
303 eosp_data = (void *)skb->cb;
304 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
305 /* skip wrong virtual interface */
306 if (memcmp(eosp_data->iface,
307 sta->sdata->vif.addr, ETH_ALEN))
308 continue;
309 clear_sta_flag(sta, WLAN_STA_SP);
310 break;
311 }
312 dev_kfree_skb(skb);
313 break;
314 default:
315 WARN(1, "mac80211: Packet is of unknown type %d\n",
316 skb->pkt_type);
317 dev_kfree_skb(skb);
318 break;
319 }
320 }
321 }
322
323 static void ieee80211_restart_work(struct work_struct *work)
324 {
325 struct ieee80211_local *local =
326 container_of(work, struct ieee80211_local, restart_work);
327
328 /* wait for scan work complete */
329 flush_workqueue(local->workqueue);
330
331 mutex_lock(&local->mtx);
332 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
333 local->sched_scanning,
334 "%s called with hardware scan in progress\n", __func__);
335 mutex_unlock(&local->mtx);
336
337 rtnl_lock();
338 ieee80211_scan_cancel(local);
339 ieee80211_reconfig(local);
340 rtnl_unlock();
341 }
342
343 void ieee80211_restart_hw(struct ieee80211_hw *hw)
344 {
345 struct ieee80211_local *local = hw_to_local(hw);
346
347 trace_api_restart_hw(local);
348
349 wiphy_info(hw->wiphy,
350 "Hardware restart was requested\n");
351
352 /* use this reason, ieee80211_reconfig will unblock it */
353 ieee80211_stop_queues_by_reason(hw,
354 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
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 },
468 [NL80211_IFTYPE_STATION] = {
469 .tx = 0xffff,
470 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
471 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
472 },
473 [NL80211_IFTYPE_AP] = {
474 .tx = 0xffff,
475 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
476 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
477 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
478 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
479 BIT(IEEE80211_STYPE_AUTH >> 4) |
480 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
481 BIT(IEEE80211_STYPE_ACTION >> 4),
482 },
483 [NL80211_IFTYPE_AP_VLAN] = {
484 /* copy AP */
485 .tx = 0xffff,
486 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
487 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
488 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
489 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
490 BIT(IEEE80211_STYPE_AUTH >> 4) |
491 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
492 BIT(IEEE80211_STYPE_ACTION >> 4),
493 },
494 [NL80211_IFTYPE_P2P_CLIENT] = {
495 .tx = 0xffff,
496 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
497 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
498 },
499 [NL80211_IFTYPE_P2P_GO] = {
500 .tx = 0xffff,
501 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
502 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
503 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
504 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
505 BIT(IEEE80211_STYPE_AUTH >> 4) |
506 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
507 BIT(IEEE80211_STYPE_ACTION >> 4),
508 },
509 [NL80211_IFTYPE_MESH_POINT] = {
510 .tx = 0xffff,
511 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
512 BIT(IEEE80211_STYPE_AUTH >> 4) |
513 BIT(IEEE80211_STYPE_DEAUTH >> 4),
514 },
515 };
516
517 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
518 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
519 IEEE80211_HT_AMPDU_PARM_DENSITY,
520
521 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
522 IEEE80211_HT_CAP_MAX_AMSDU |
523 IEEE80211_HT_CAP_SGI_40),
524 .mcs = {
525 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
526 0xff, 0xff, 0xff, 0xff, 0xff, },
527 },
528 };
529
530 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
531 const struct ieee80211_ops *ops)
532 {
533 struct ieee80211_local *local;
534 int priv_size, i;
535 struct wiphy *wiphy;
536
537 /* Ensure 32-byte alignment of our private data and hw private data.
538 * We use the wiphy priv data for both our ieee80211_local and for
539 * the driver's private data
540 *
541 * In memory it'll be like this:
542 *
543 * +-------------------------+
544 * | struct wiphy |
545 * +-------------------------+
546 * | struct ieee80211_local |
547 * +-------------------------+
548 * | driver's private data |
549 * +-------------------------+
550 *
551 */
552 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
553
554 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
555
556 if (!wiphy)
557 return NULL;
558
559 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
560
561 wiphy->privid = mac80211_wiphy_privid;
562
563 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
564 WIPHY_FLAG_4ADDR_AP |
565 WIPHY_FLAG_4ADDR_STATION |
566 WIPHY_FLAG_REPORTS_OBSS |
567 WIPHY_FLAG_OFFCHAN_TX |
568 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
569
570 wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
571 NL80211_FEATURE_HT_IBSS;
572
573 if (!ops->set_key)
574 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
575
576 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
577
578 local = wiphy_priv(wiphy);
579
580 local->hw.wiphy = wiphy;
581
582 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
583
584 BUG_ON(!ops->tx && !ops->tx_frags);
585 BUG_ON(!ops->start);
586 BUG_ON(!ops->stop);
587 BUG_ON(!ops->config);
588 BUG_ON(!ops->add_interface);
589 BUG_ON(!ops->remove_interface);
590 BUG_ON(!ops->configure_filter);
591 local->ops = ops;
592
593 /* set up some defaults */
594 local->hw.queues = 1;
595 local->hw.max_rates = 1;
596 local->hw.max_report_rates = 0;
597 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
598 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
599 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
600 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
601 local->user_power_level = -1;
602 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
603 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
604 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
605
606 INIT_LIST_HEAD(&local->interfaces);
607
608 __hw_addr_init(&local->mc_list);
609
610 mutex_init(&local->iflist_mtx);
611 mutex_init(&local->mtx);
612
613 mutex_init(&local->key_mtx);
614 spin_lock_init(&local->filter_lock);
615 spin_lock_init(&local->queue_stop_reason_lock);
616
617 /*
618 * The rx_skb_queue is only accessed from tasklets,
619 * but other SKB queues are used from within IRQ
620 * context. Therefore, this one needs a different
621 * locking class so our direct, non-irq-safe use of
622 * the queue's lock doesn't throw lockdep warnings.
623 */
624 skb_queue_head_init_class(&local->rx_skb_queue,
625 &ieee80211_rx_skb_queue_class);
626
627 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
628
629 ieee80211_work_init(local);
630
631 INIT_WORK(&local->restart_work, ieee80211_restart_work);
632
633 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
634 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
635 local->smps_mode = IEEE80211_SMPS_OFF;
636
637 INIT_WORK(&local->dynamic_ps_enable_work,
638 ieee80211_dynamic_ps_enable_work);
639 INIT_WORK(&local->dynamic_ps_disable_work,
640 ieee80211_dynamic_ps_disable_work);
641 setup_timer(&local->dynamic_ps_timer,
642 ieee80211_dynamic_ps_timer, (unsigned long) local);
643
644 INIT_WORK(&local->sched_scan_stopped_work,
645 ieee80211_sched_scan_stopped_work);
646
647 spin_lock_init(&local->ack_status_lock);
648 idr_init(&local->ack_status_frames);
649 /* preallocate at least one entry */
650 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
651
652 sta_info_init(local);
653
654 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
655 skb_queue_head_init(&local->pending[i]);
656 atomic_set(&local->agg_queue_stop[i], 0);
657 }
658 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
659 (unsigned long)local);
660
661 tasklet_init(&local->tasklet,
662 ieee80211_tasklet_handler,
663 (unsigned long) local);
664
665 skb_queue_head_init(&local->skb_queue);
666 skb_queue_head_init(&local->skb_queue_unreliable);
667
668 /* init dummy netdev for use w/ NAPI */
669 init_dummy_netdev(&local->napi_dev);
670
671 ieee80211_led_names(local);
672
673 ieee80211_hw_roc_setup(local);
674
675 return local_to_hw(local);
676 }
677 EXPORT_SYMBOL(ieee80211_alloc_hw);
678
679 int ieee80211_register_hw(struct ieee80211_hw *hw)
680 {
681 struct ieee80211_local *local = hw_to_local(hw);
682 int result, i;
683 enum ieee80211_band band;
684 int channels, max_bitrates;
685 bool supp_ht;
686 static const u32 cipher_suites[] = {
687 /* keep WEP first, it may be removed below */
688 WLAN_CIPHER_SUITE_WEP40,
689 WLAN_CIPHER_SUITE_WEP104,
690 WLAN_CIPHER_SUITE_TKIP,
691 WLAN_CIPHER_SUITE_CCMP,
692
693 /* keep last -- depends on hw flags! */
694 WLAN_CIPHER_SUITE_AES_CMAC
695 };
696
697 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
698 #ifdef CONFIG_PM
699 && (!local->ops->suspend || !local->ops->resume)
700 #endif
701 )
702 return -EINVAL;
703
704 if (hw->max_report_rates == 0)
705 hw->max_report_rates = hw->max_rates;
706
707 /*
708 * generic code guarantees at least one band,
709 * set this very early because much code assumes
710 * that hw.conf.channel is assigned
711 */
712 channels = 0;
713 max_bitrates = 0;
714 supp_ht = false;
715 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
716 struct ieee80211_supported_band *sband;
717
718 sband = local->hw.wiphy->bands[band];
719 if (!sband)
720 continue;
721 if (!local->oper_channel) {
722 /* init channel we're on */
723 local->hw.conf.channel =
724 local->oper_channel = &sband->channels[0];
725 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
726 }
727 channels += sband->n_channels;
728
729 if (max_bitrates < sband->n_bitrates)
730 max_bitrates = sband->n_bitrates;
731 supp_ht = supp_ht || sband->ht_cap.ht_supported;
732 }
733
734 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
735 sizeof(void *) * channels, GFP_KERNEL);
736 if (!local->int_scan_req)
737 return -ENOMEM;
738
739 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
740 if (!local->hw.wiphy->bands[band])
741 continue;
742 local->int_scan_req->rates[band] = (u32) -1;
743 }
744
745 /* if low-level driver supports AP, we also support VLAN */
746 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
747 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
748 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
749 }
750
751 /* mac80211 always supports monitor */
752 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
753 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
754
755 /*
756 * mac80211 doesn't support more than 1 channel, and also not more
757 * than one IBSS interface
758 */
759 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
760 const struct ieee80211_iface_combination *c;
761 int j;
762
763 c = &hw->wiphy->iface_combinations[i];
764
765 if (c->num_different_channels > 1)
766 return -EINVAL;
767
768 for (j = 0; j < c->n_limits; j++)
769 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
770 c->limits[j].max > 1)
771 return -EINVAL;
772 }
773
774 #ifndef CONFIG_MAC80211_MESH
775 /* mesh depends on Kconfig, but drivers should set it if they want */
776 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
777 #endif
778
779 /* if the underlying driver supports mesh, mac80211 will (at least)
780 * provide routing of mesh authentication frames to userspace */
781 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
782 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
783
784 /* mac80211 supports control port protocol changing */
785 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
786
787 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
788 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
789 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
790 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
791
792 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
793 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
794 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
795
796 /*
797 * Calculate scan IE length -- we need this to alloc
798 * memory and to subtract from the driver limit. It
799 * includes the DS Params, (extended) supported rates, and HT
800 * information -- SSID is the driver's responsibility.
801 */
802 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
803 3 /* DS Params */;
804 if (supp_ht)
805 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806
807 if (!local->ops->hw_scan) {
808 /* For hw_scan, driver needs to set these up. */
809 local->hw.wiphy->max_scan_ssids = 4;
810 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811 }
812
813 /*
814 * If the driver supports any scan IEs, then assume the
815 * limit includes the IEs mac80211 will add, otherwise
816 * leave it at zero and let the driver sort it out; we
817 * still pass our IEs to the driver but userspace will
818 * not be allowed to in that case.
819 */
820 if (local->hw.wiphy->max_scan_ie_len)
821 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822
823 /* Set up cipher suites unless driver already did */
824 if (!local->hw.wiphy->cipher_suites) {
825 local->hw.wiphy->cipher_suites = cipher_suites;
826 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
827 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
828 local->hw.wiphy->n_cipher_suites--;
829 }
830 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
831 if (local->hw.wiphy->cipher_suites == cipher_suites) {
832 local->hw.wiphy->cipher_suites += 2;
833 local->hw.wiphy->n_cipher_suites -= 2;
834 } else {
835 u32 *suites;
836 int r, w = 0;
837
838 /* Filter out WEP */
839
840 suites = kmemdup(
841 local->hw.wiphy->cipher_suites,
842 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
843 GFP_KERNEL);
844 if (!suites)
845 return -ENOMEM;
846 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
847 u32 suite = local->hw.wiphy->cipher_suites[r];
848 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
849 suite == WLAN_CIPHER_SUITE_WEP104)
850 continue;
851 suites[w++] = suite;
852 }
853 local->hw.wiphy->cipher_suites = suites;
854 local->hw.wiphy->n_cipher_suites = w;
855 local->wiphy_ciphers_allocated = true;
856 }
857 }
858
859 if (!local->ops->remain_on_channel)
860 local->hw.wiphy->max_remain_on_channel_duration = 5000;
861
862 if (local->ops->sched_scan_start)
863 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
864
865 /* mac80211 based drivers don't support internal TDLS setup */
866 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
867 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
868
869 result = wiphy_register(local->hw.wiphy);
870 if (result < 0)
871 goto fail_wiphy_register;
872
873 /*
874 * We use the number of queues for feature tests (QoS, HT) internally
875 * so restrict them appropriately.
876 */
877 if (hw->queues > IEEE80211_MAX_QUEUES)
878 hw->queues = IEEE80211_MAX_QUEUES;
879
880 local->workqueue =
881 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
882 if (!local->workqueue) {
883 result = -ENOMEM;
884 goto fail_workqueue;
885 }
886
887 /*
888 * The hardware needs headroom for sending the frame,
889 * and we need some headroom for passing the frame to monitor
890 * interfaces, but never both at the same time.
891 */
892 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893 IEEE80211_TX_STATUS_HEADROOM);
894
895 debugfs_hw_add(local);
896
897 /*
898 * if the driver doesn't specify a max listen interval we
899 * use 5 which should be a safe default
900 */
901 if (local->hw.max_listen_interval == 0)
902 local->hw.max_listen_interval = 5;
903
904 local->hw.conf.listen_interval = local->hw.max_listen_interval;
905
906 local->dynamic_ps_forced_timeout = -1;
907
908 result = ieee80211_wep_init(local);
909 if (result < 0)
910 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
911 result);
912
913 ieee80211_led_init(local);
914
915 rtnl_lock();
916
917 result = ieee80211_init_rate_ctrl_alg(local,
918 hw->rate_control_algorithm);
919 if (result < 0) {
920 wiphy_debug(local->hw.wiphy,
921 "Failed to initialize rate control algorithm\n");
922 goto fail_rate;
923 }
924
925 /* add one default STA interface if supported */
926 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
927 result = ieee80211_if_add(local, "wlan%d", NULL,
928 NL80211_IFTYPE_STATION, NULL);
929 if (result)
930 wiphy_warn(local->hw.wiphy,
931 "Failed to add default virtual iface\n");
932 }
933
934 rtnl_unlock();
935
936 local->network_latency_notifier.notifier_call =
937 ieee80211_max_network_latency;
938 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
939 &local->network_latency_notifier);
940 if (result) {
941 rtnl_lock();
942 goto fail_pm_qos;
943 }
944
945 #ifdef CONFIG_INET
946 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
947 result = register_inetaddr_notifier(&local->ifa_notifier);
948 if (result)
949 goto fail_ifa;
950 #endif
951
952 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
953 local->hw.napi_weight);
954
955 return 0;
956
957 #ifdef CONFIG_INET
958 fail_ifa:
959 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
960 &local->network_latency_notifier);
961 rtnl_lock();
962 #endif
963 fail_pm_qos:
964 ieee80211_led_exit(local);
965 ieee80211_remove_interfaces(local);
966 fail_rate:
967 rtnl_unlock();
968 ieee80211_wep_free(local);
969 sta_info_stop(local);
970 destroy_workqueue(local->workqueue);
971 fail_workqueue:
972 wiphy_unregister(local->hw.wiphy);
973 fail_wiphy_register:
974 if (local->wiphy_ciphers_allocated)
975 kfree(local->hw.wiphy->cipher_suites);
976 kfree(local->int_scan_req);
977 return result;
978 }
979 EXPORT_SYMBOL(ieee80211_register_hw);
980
981 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
982 {
983 struct ieee80211_local *local = hw_to_local(hw);
984
985 tasklet_kill(&local->tx_pending_tasklet);
986 tasklet_kill(&local->tasklet);
987
988 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
989 &local->network_latency_notifier);
990 #ifdef CONFIG_INET
991 unregister_inetaddr_notifier(&local->ifa_notifier);
992 #endif
993
994 rtnl_lock();
995
996 /*
997 * At this point, interface list manipulations are fine
998 * because the driver cannot be handing us frames any
999 * more and the tasklet is killed.
1000 */
1001 ieee80211_remove_interfaces(local);
1002
1003 rtnl_unlock();
1004
1005 /*
1006 * Now all work items will be gone, but the
1007 * timer might still be armed, so delete it
1008 */
1009 del_timer_sync(&local->work_timer);
1010
1011 cancel_work_sync(&local->restart_work);
1012 cancel_work_sync(&local->reconfig_filter);
1013
1014 ieee80211_clear_tx_pending(local);
1015 rate_control_deinitialize(local);
1016
1017 if (skb_queue_len(&local->skb_queue) ||
1018 skb_queue_len(&local->skb_queue_unreliable))
1019 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1020 skb_queue_purge(&local->skb_queue);
1021 skb_queue_purge(&local->skb_queue_unreliable);
1022 skb_queue_purge(&local->rx_skb_queue);
1023
1024 destroy_workqueue(local->workqueue);
1025 wiphy_unregister(local->hw.wiphy);
1026 sta_info_stop(local);
1027 ieee80211_wep_free(local);
1028 ieee80211_led_exit(local);
1029 kfree(local->int_scan_req);
1030 }
1031 EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1034 {
1035 WARN_ONCE(1, "Have pending ack frames!\n");
1036 kfree_skb(p);
1037 return 0;
1038 }
1039
1040 void ieee80211_free_hw(struct ieee80211_hw *hw)
1041 {
1042 struct ieee80211_local *local = hw_to_local(hw);
1043
1044 mutex_destroy(&local->iflist_mtx);
1045 mutex_destroy(&local->mtx);
1046
1047 if (local->wiphy_ciphers_allocated)
1048 kfree(local->hw.wiphy->cipher_suites);
1049
1050 idr_for_each(&local->ack_status_frames,
1051 ieee80211_free_ack_frame, NULL);
1052 idr_destroy(&local->ack_status_frames);
1053
1054 wiphy_free(local->hw.wiphy);
1055 }
1056 EXPORT_SYMBOL(ieee80211_free_hw);
1057
1058 static int __init ieee80211_init(void)
1059 {
1060 struct sk_buff *skb;
1061 int ret;
1062
1063 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1064 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1065 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1066
1067 ret = rc80211_minstrel_init();
1068 if (ret)
1069 return ret;
1070
1071 ret = rc80211_minstrel_ht_init();
1072 if (ret)
1073 goto err_minstrel;
1074
1075 ret = rc80211_pid_init();
1076 if (ret)
1077 goto err_pid;
1078
1079 ret = ieee80211_iface_init();
1080 if (ret)
1081 goto err_netdev;
1082
1083 return 0;
1084 err_netdev:
1085 rc80211_pid_exit();
1086 err_pid:
1087 rc80211_minstrel_ht_exit();
1088 err_minstrel:
1089 rc80211_minstrel_exit();
1090
1091 return ret;
1092 }
1093
1094 static void __exit ieee80211_exit(void)
1095 {
1096 rc80211_pid_exit();
1097 rc80211_minstrel_ht_exit();
1098 rc80211_minstrel_exit();
1099
1100 if (mesh_allocated)
1101 ieee80211s_stop();
1102
1103 ieee80211_iface_exit();
1104
1105 rcu_barrier();
1106 }
1107
1108
1109 subsys_initcall(ieee80211_init);
1110 module_exit(ieee80211_exit);
1111
1112 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1113 MODULE_LICENSE("GPL");
Linux with added FPC-III support