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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6.git] / net / mac80211 / main.c
blobd6e43b08d6293a292ef92ea65e4d395d17d9b838
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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
97 {
98 struct ieee80211_channel *chan;
99 u32 changed = 0;
100 int power;
101 enum nl80211_channel_type channel_type;
102 u32 offchannel_flag;
103
104 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
105 if (local->scan_channel) {
106 chan = local->scan_channel;
107 /* If scanning on oper channel, use whatever channel-type
108 * is currently in use.
109 */
110 if (chan == local->_oper_channel)
111 channel_type = local->_oper_channel_type;
112 else
113 channel_type = NL80211_CHAN_NO_HT;
114 } else if (local->tmp_channel) {
115 chan = local->tmp_channel;
116 channel_type = local->tmp_channel_type;
117 } else {
118 chan = local->_oper_channel;
119 channel_type = local->_oper_channel_type;
120 }
121
122 if (chan != local->_oper_channel ||
123 channel_type != local->_oper_channel_type)
124 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
125 else
126 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
127
128 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
129
130 if (offchannel_flag || chan != local->hw.conf.channel ||
131 channel_type != local->hw.conf.channel_type) {
132 local->hw.conf.channel = chan;
133 local->hw.conf.channel_type = channel_type;
134 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
135 }
136
137 if (!conf_is_ht(&local->hw.conf)) {
138 /*
139 * mac80211.h documents that this is only valid
140 * when the channel is set to an HT type, and
141 * that otherwise STATIC is used.
142 */
143 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
144 } else if (local->hw.conf.smps_mode != local->smps_mode) {
145 local->hw.conf.smps_mode = local->smps_mode;
146 changed |= IEEE80211_CONF_CHANGE_SMPS;
147 }
148
149 if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
150 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
151 test_bit(SCAN_HW_SCANNING, &local->scanning) ||
152 !local->ap_power_level)
153 power = chan->max_power;
154 else
155 power = min(chan->max_power, local->ap_power_level);
156
157 if (local->user_power_level >= 0)
158 power = min(power, local->user_power_level);
159
160 if (local->hw.conf.power_level != power) {
161 changed |= IEEE80211_CONF_CHANGE_POWER;
162 local->hw.conf.power_level = power;
163 }
164
165 return changed;
166 }
167
168 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
169 {
170 int ret = 0;
171
172 might_sleep();
173
174 if (!local->use_chanctx)
175 changed |= ieee80211_hw_conf_chan(local);
176 else
177 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
178 IEEE80211_CONF_CHANGE_POWER);
179
180 if (changed && local->open_count) {
181 ret = drv_config(local, changed);
182 /*
183 * Goal:
184 * HW reconfiguration should never fail, the driver has told
185 * us what it can support so it should live up to that promise.
186 *
187 * Current status:
188 * rfkill is not integrated with mac80211 and a
189 * configuration command can thus fail if hardware rfkill
190 * is enabled
191 *
192 * FIXME: integrate rfkill with mac80211 and then add this
193 * WARN_ON() back
194 *
195 */
196 /* WARN_ON(ret); */
197 }
198
199 return ret;
200 }
201
202 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
203 u32 changed)
204 {
205 struct ieee80211_local *local = sdata->local;
206 static const u8 zero[ETH_ALEN] = { 0 };
207
208 if (!changed)
209 return;
210
211 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
212 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
213 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
214 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
215 else if (sdata->vif.type == NL80211_IFTYPE_AP)
216 sdata->vif.bss_conf.bssid = sdata->vif.addr;
217 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
218 sdata->vif.bss_conf.bssid = NULL;
219 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
220 sdata->vif.bss_conf.bssid = zero;
221 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
222 sdata->vif.bss_conf.bssid = sdata->vif.addr;
223 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
224 "P2P Device BSS changed %#x", changed);
225 } else {
226 WARN_ON(1);
227 return;
228 }
229
230 switch (sdata->vif.type) {
231 case NL80211_IFTYPE_AP:
232 case NL80211_IFTYPE_ADHOC:
233 case NL80211_IFTYPE_WDS:
234 case NL80211_IFTYPE_MESH_POINT:
235 break;
236 default:
237 /* do not warn to simplify caller in scan.c */
238 changed &= ~BSS_CHANGED_BEACON_ENABLED;
239 if (WARN_ON(changed & BSS_CHANGED_BEACON))
240 return;
241 break;
242 }
243
244 if (changed & BSS_CHANGED_BEACON_ENABLED) {
245 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
246 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
247 sdata->vif.bss_conf.enable_beacon = false;
248 } else {
249 /*
250 * Beacon should be enabled, but AP mode must
251 * check whether there is a beacon configured.
252 */
253 switch (sdata->vif.type) {
254 case NL80211_IFTYPE_AP:
255 sdata->vif.bss_conf.enable_beacon =
256 !!sdata->u.ap.beacon;
257 break;
258 case NL80211_IFTYPE_ADHOC:
259 sdata->vif.bss_conf.enable_beacon =
260 !!sdata->u.ibss.presp;
261 break;
262 #ifdef CONFIG_MAC80211_MESH
263 case NL80211_IFTYPE_MESH_POINT:
264 sdata->vif.bss_conf.enable_beacon =
265 !!sdata->u.mesh.mesh_id_len;
266 break;
267 #endif
268 default:
269 /* not reached */
270 WARN_ON(1);
271 break;
272 }
273 }
274 }
275
276 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
277 }
278
279 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
280 {
281 sdata->vif.bss_conf.use_cts_prot = false;
282 sdata->vif.bss_conf.use_short_preamble = false;
283 sdata->vif.bss_conf.use_short_slot = false;
284 return BSS_CHANGED_ERP_CTS_PROT |
285 BSS_CHANGED_ERP_PREAMBLE |
286 BSS_CHANGED_ERP_SLOT;
287 }
288
289 static void ieee80211_tasklet_handler(unsigned long data)
290 {
291 struct ieee80211_local *local = (struct ieee80211_local *) data;
292 struct sta_info *sta, *tmp;
293 struct skb_eosp_msg_data *eosp_data;
294 struct sk_buff *skb;
295
296 while ((skb = skb_dequeue(&local->skb_queue)) ||
297 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
298 switch (skb->pkt_type) {
299 case IEEE80211_RX_MSG:
300 /* Clear skb->pkt_type in order to not confuse kernel
301 * netstack. */
302 skb->pkt_type = 0;
303 ieee80211_rx(&local->hw, skb);
304 break;
305 case IEEE80211_TX_STATUS_MSG:
306 skb->pkt_type = 0;
307 ieee80211_tx_status(&local->hw, skb);
308 break;
309 case IEEE80211_EOSP_MSG:
310 eosp_data = (void *)skb->cb;
311 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
312 /* skip wrong virtual interface */
313 if (memcmp(eosp_data->iface,
314 sta->sdata->vif.addr, ETH_ALEN))
315 continue;
316 clear_sta_flag(sta, WLAN_STA_SP);
317 break;
318 }
319 dev_kfree_skb(skb);
320 break;
321 default:
322 WARN(1, "mac80211: Packet is of unknown type %d\n",
323 skb->pkt_type);
324 dev_kfree_skb(skb);
325 break;
326 }
327 }
328 }
329
330 static void ieee80211_restart_work(struct work_struct *work)
331 {
332 struct ieee80211_local *local =
333 container_of(work, struct ieee80211_local, restart_work);
334
335 /* wait for scan work complete */
336 flush_workqueue(local->workqueue);
337
338 mutex_lock(&local->mtx);
339 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
340 rcu_dereference_protected(local->sched_scan_sdata,
341 lockdep_is_held(&local->mtx)),
342 "%s called with hardware scan in progress\n", __func__);
343 mutex_unlock(&local->mtx);
344
345 rtnl_lock();
346 ieee80211_scan_cancel(local);
347 ieee80211_reconfig(local);
348 rtnl_unlock();
349 }
350
351 void ieee80211_restart_hw(struct ieee80211_hw *hw)
352 {
353 struct ieee80211_local *local = hw_to_local(hw);
354
355 trace_api_restart_hw(local);
356
357 wiphy_info(hw->wiphy,
358 "Hardware restart was requested\n");
359
360 /* use this reason, ieee80211_reconfig will unblock it */
361 ieee80211_stop_queues_by_reason(hw,
362 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
363
364 /*
365 * Stop all Rx during the reconfig. We don't want state changes
366 * or driver callbacks while this is in progress.
367 */
368 local->in_reconfig = true;
369 barrier();
370
371 schedule_work(&local->restart_work);
372 }
373 EXPORT_SYMBOL(ieee80211_restart_hw);
374
375 #ifdef CONFIG_INET
376 static int ieee80211_ifa_changed(struct notifier_block *nb,
377 unsigned long data, void *arg)
378 {
379 struct in_ifaddr *ifa = arg;
380 struct ieee80211_local *local =
381 container_of(nb, struct ieee80211_local,
382 ifa_notifier);
383 struct net_device *ndev = ifa->ifa_dev->dev;
384 struct wireless_dev *wdev = ndev->ieee80211_ptr;
385 struct in_device *idev;
386 struct ieee80211_sub_if_data *sdata;
387 struct ieee80211_bss_conf *bss_conf;
388 struct ieee80211_if_managed *ifmgd;
389 int c = 0;
390
391 /* Make sure it's our interface that got changed */
392 if (!wdev)
393 return NOTIFY_DONE;
394
395 if (wdev->wiphy != local->hw.wiphy)
396 return NOTIFY_DONE;
397
398 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
399 bss_conf = &sdata->vif.bss_conf;
400
401 /* ARP filtering is only supported in managed mode */
402 if (sdata->vif.type != NL80211_IFTYPE_STATION)
403 return NOTIFY_DONE;
404
405 idev = __in_dev_get_rtnl(sdata->dev);
406 if (!idev)
407 return NOTIFY_DONE;
408
409 ifmgd = &sdata->u.mgd;
410 mutex_lock(&ifmgd->mtx);
411
412 /* Copy the addresses to the bss_conf list */
413 ifa = idev->ifa_list;
414 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
415 bss_conf->arp_addr_list[c] = ifa->ifa_address;
416 ifa = ifa->ifa_next;
417 c++;
418 }
419
420 /* If not all addresses fit the list, disable filtering */
421 if (ifa) {
422 sdata->arp_filter_state = false;
423 c = 0;
424 } else {
425 sdata->arp_filter_state = true;
426 }
427 bss_conf->arp_addr_cnt = c;
428
429 /* Configure driver only if associated (which also implies it is up) */
430 if (ifmgd->associated) {
431 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
432 ieee80211_bss_info_change_notify(sdata,
433 BSS_CHANGED_ARP_FILTER);
434 }
435
436 mutex_unlock(&ifmgd->mtx);
437
438 return NOTIFY_DONE;
439 }
440 #endif
441
442 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
443 {
444 struct ieee80211_local *local =
445 container_of(napi, struct ieee80211_local, napi);
446
447 return local->ops->napi_poll(&local->hw, budget);
448 }
449
450 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
451 {
452 struct ieee80211_local *local = hw_to_local(hw);
453
454 napi_schedule(&local->napi);
455 }
456 EXPORT_SYMBOL(ieee80211_napi_schedule);
457
458 void ieee80211_napi_complete(struct ieee80211_hw *hw)
459 {
460 struct ieee80211_local *local = hw_to_local(hw);
461
462 napi_complete(&local->napi);
463 }
464 EXPORT_SYMBOL(ieee80211_napi_complete);
465
466 /* There isn't a lot of sense in it, but you can transmit anything you like */
467 static const struct ieee80211_txrx_stypes
468 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
469 [NL80211_IFTYPE_ADHOC] = {
470 .tx = 0xffff,
471 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
472 BIT(IEEE80211_STYPE_AUTH >> 4) |
473 BIT(IEEE80211_STYPE_DEAUTH >> 4),
474 },
475 [NL80211_IFTYPE_STATION] = {
476 .tx = 0xffff,
477 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
478 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
479 },
480 [NL80211_IFTYPE_AP] = {
481 .tx = 0xffff,
482 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
483 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
484 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
485 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
486 BIT(IEEE80211_STYPE_AUTH >> 4) |
487 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
488 BIT(IEEE80211_STYPE_ACTION >> 4),
489 },
490 [NL80211_IFTYPE_AP_VLAN] = {
491 /* copy AP */
492 .tx = 0xffff,
493 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
494 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
495 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
496 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
497 BIT(IEEE80211_STYPE_AUTH >> 4) |
498 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
499 BIT(IEEE80211_STYPE_ACTION >> 4),
500 },
501 [NL80211_IFTYPE_P2P_CLIENT] = {
502 .tx = 0xffff,
503 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
504 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
505 },
506 [NL80211_IFTYPE_P2P_GO] = {
507 .tx = 0xffff,
508 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
509 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
510 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
511 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
512 BIT(IEEE80211_STYPE_AUTH >> 4) |
513 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
514 BIT(IEEE80211_STYPE_ACTION >> 4),
515 },
516 [NL80211_IFTYPE_MESH_POINT] = {
517 .tx = 0xffff,
518 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
519 BIT(IEEE80211_STYPE_AUTH >> 4) |
520 BIT(IEEE80211_STYPE_DEAUTH >> 4),
521 },
522 [NL80211_IFTYPE_P2P_DEVICE] = {
523 .tx = 0xffff,
524 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
525 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
526 },
527 };
528
529 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
530 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
531 IEEE80211_HT_AMPDU_PARM_DENSITY,
532
533 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
534 IEEE80211_HT_CAP_MAX_AMSDU |
535 IEEE80211_HT_CAP_SGI_40),
536 .mcs = {
537 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
538 0xff, 0xff, 0xff, 0xff, 0xff, },
539 },
540 };
541
542 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
543 const struct ieee80211_ops *ops)
544 {
545 struct ieee80211_local *local;
546 int priv_size, i;
547 struct wiphy *wiphy;
548 bool use_chanctx;
549
550 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
551 !ops->add_interface || !ops->remove_interface ||
552 !ops->configure_filter))
553 return NULL;
554
555 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
556 return NULL;
557
558 /* check all or no channel context operations exist */
559 i = !!ops->add_chanctx + !!ops->remove_chanctx +
560 !!ops->change_chanctx + !!ops->assign_vif_chanctx +
561 !!ops->unassign_vif_chanctx;
562 if (WARN_ON(i != 0 && i != 5))
563 return NULL;
564 use_chanctx = i == 5;
565
566 /* Ensure 32-byte alignment of our private data and hw private data.
567 * We use the wiphy priv data for both our ieee80211_local and for
568 * the driver's private data
569 *
570 * In memory it'll be like this:
571 *
572 * +-------------------------+
573 * | struct wiphy |
574 * +-------------------------+
575 * | struct ieee80211_local |
576 * +-------------------------+
577 * | driver's private data |
578 * +-------------------------+
579 *
580 */
581 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
582
583 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
584
585 if (!wiphy)
586 return NULL;
587
588 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
589
590 wiphy->privid = mac80211_wiphy_privid;
591
592 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
593 WIPHY_FLAG_4ADDR_AP |
594 WIPHY_FLAG_4ADDR_STATION |
595 WIPHY_FLAG_REPORTS_OBSS |
596 WIPHY_FLAG_OFFCHAN_TX;
597
598 if (ops->remain_on_channel)
599 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
600
601 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
602 NL80211_FEATURE_SAE |
603 NL80211_FEATURE_HT_IBSS;
604
605 if (!ops->hw_scan)
606 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
607 NL80211_FEATURE_AP_SCAN;
608
609
610 if (!ops->set_key)
611 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
612
613 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
614
615 local = wiphy_priv(wiphy);
616
617 local->hw.wiphy = wiphy;
618
619 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
620
621 local->ops = ops;
622 local->use_chanctx = use_chanctx;
623
624 /* set up some defaults */
625 local->hw.queues = 1;
626 local->hw.max_rates = 1;
627 local->hw.max_report_rates = 0;
628 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
629 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
630 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
631 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
632 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
633 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
634 IEEE80211_RADIOTAP_MCS_HAVE_GI |
635 IEEE80211_RADIOTAP_MCS_HAVE_BW;
636 local->user_power_level = -1;
637 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
638
639 INIT_LIST_HEAD(&local->interfaces);
640
641 __hw_addr_init(&local->mc_list);
642
643 mutex_init(&local->iflist_mtx);
644 mutex_init(&local->mtx);
645
646 mutex_init(&local->key_mtx);
647 spin_lock_init(&local->filter_lock);
648 spin_lock_init(&local->queue_stop_reason_lock);
649
650 INIT_LIST_HEAD(&local->chanctx_list);
651 mutex_init(&local->chanctx_mtx);
652
653 /*
654 * The rx_skb_queue is only accessed from tasklets,
655 * but other SKB queues are used from within IRQ
656 * context. Therefore, this one needs a different
657 * locking class so our direct, non-irq-safe use of
658 * the queue's lock doesn't throw lockdep warnings.
659 */
660 skb_queue_head_init_class(&local->rx_skb_queue,
661 &ieee80211_rx_skb_queue_class);
662
663 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
664
665 INIT_WORK(&local->restart_work, ieee80211_restart_work);
666
667 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
668 local->smps_mode = IEEE80211_SMPS_OFF;
669
670 INIT_WORK(&local->dynamic_ps_enable_work,
671 ieee80211_dynamic_ps_enable_work);
672 INIT_WORK(&local->dynamic_ps_disable_work,
673 ieee80211_dynamic_ps_disable_work);
674 setup_timer(&local->dynamic_ps_timer,
675 ieee80211_dynamic_ps_timer, (unsigned long) local);
676
677 INIT_WORK(&local->sched_scan_stopped_work,
678 ieee80211_sched_scan_stopped_work);
679
680 spin_lock_init(&local->ack_status_lock);
681 idr_init(&local->ack_status_frames);
682 /* preallocate at least one entry */
683 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
684
685 sta_info_init(local);
686
687 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
688 skb_queue_head_init(&local->pending[i]);
689 atomic_set(&local->agg_queue_stop[i], 0);
690 }
691 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
692 (unsigned long)local);
693
694 tasklet_init(&local->tasklet,
695 ieee80211_tasklet_handler,
696 (unsigned long) local);
697
698 skb_queue_head_init(&local->skb_queue);
699 skb_queue_head_init(&local->skb_queue_unreliable);
700
701 /* init dummy netdev for use w/ NAPI */
702 init_dummy_netdev(&local->napi_dev);
703
704 ieee80211_led_names(local);
705
706 ieee80211_roc_setup(local);
707
708 return &local->hw;
709 }
710 EXPORT_SYMBOL(ieee80211_alloc_hw);
711
712 int ieee80211_register_hw(struct ieee80211_hw *hw)
713 {
714 struct ieee80211_local *local = hw_to_local(hw);
715 int result, i;
716 enum ieee80211_band band;
717 int channels, max_bitrates;
718 bool supp_ht, supp_vht;
719 netdev_features_t feature_whitelist;
720 static const u32 cipher_suites[] = {
721 /* keep WEP first, it may be removed below */
722 WLAN_CIPHER_SUITE_WEP40,
723 WLAN_CIPHER_SUITE_WEP104,
724 WLAN_CIPHER_SUITE_TKIP,
725 WLAN_CIPHER_SUITE_CCMP,
726
727 /* keep last -- depends on hw flags! */
728 WLAN_CIPHER_SUITE_AES_CMAC
729 };
730
731 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
732 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
733 local->hw.offchannel_tx_hw_queue >= local->hw.queues))
734 return -EINVAL;
735
736 #ifdef CONFIG_PM
737 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
738 (!local->ops->suspend || !local->ops->resume))
739 return -EINVAL;
740 #endif
741
742 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
743 return -EINVAL;
744
745 if (!local->use_chanctx) {
746 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
747 const struct ieee80211_iface_combination *comb;
748
749 comb = &local->hw.wiphy->iface_combinations[i];
750
751 if (comb->num_different_channels > 1)
752 return -EINVAL;
753 }
754 } else {
755 /*
756 * WDS is currently prohibited when channel contexts are used
757 * because there's no clear definition of which channel WDS
758 * type interfaces use
759 */
760 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
761 return -EINVAL;
762 }
763
764 /* Only HW csum features are currently compatible with mac80211 */
765 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
766 NETIF_F_HW_CSUM;
767 if (WARN_ON(hw->netdev_features & ~feature_whitelist))
768 return -EINVAL;
769
770 if (hw->max_report_rates == 0)
771 hw->max_report_rates = hw->max_rates;
772
773 local->rx_chains = 1;
774
775 /*
776 * generic code guarantees at least one band,
777 * set this very early because much code assumes
778 * that hw.conf.channel is assigned
779 */
780 channels = 0;
781 max_bitrates = 0;
782 supp_ht = false;
783 supp_vht = false;
784 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
785 struct ieee80211_supported_band *sband;
786
787 sband = local->hw.wiphy->bands[band];
788 if (!sband)
789 continue;
790 if (!local->use_chanctx && !local->_oper_channel) {
791 /* init channel we're on */
792 local->hw.conf.channel =
793 local->_oper_channel = &sband->channels[0];
794 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
795 }
796 if (!local->monitor_channel) {
797 local->monitor_channel = &sband->channels[0];
798 local->monitor_channel_type = NL80211_CHAN_NO_HT;
799 }
800 channels += sband->n_channels;
801
802 if (max_bitrates < sband->n_bitrates)
803 max_bitrates = sband->n_bitrates;
804 supp_ht = supp_ht || sband->ht_cap.ht_supported;
805 supp_vht = supp_vht || sband->vht_cap.vht_supported;
806
807 if (sband->ht_cap.ht_supported)
808 local->rx_chains =
809 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
810 local->rx_chains);
811
812 /* TODO: consider VHT for RX chains, hopefully it's the same */
813 }
814
815 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
816 sizeof(void *) * channels, GFP_KERNEL);
817 if (!local->int_scan_req)
818 return -ENOMEM;
819
820 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
821 if (!local->hw.wiphy->bands[band])
822 continue;
823 local->int_scan_req->rates[band] = (u32) -1;
824 }
825
826 /* if low-level driver supports AP, we also support VLAN */
827 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
828 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
829 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
830 }
831
832 /* mac80211 always supports monitor */
833 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
834 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
835
836 /* mac80211 doesn't support more than one IBSS interface right now */
837 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
838 const struct ieee80211_iface_combination *c;
839 int j;
840
841 c = &hw->wiphy->iface_combinations[i];
842
843 for (j = 0; j < c->n_limits; j++)
844 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
845 c->limits[j].max > 1)
846 return -EINVAL;
847 }
848
849 #ifndef CONFIG_MAC80211_MESH
850 /* mesh depends on Kconfig, but drivers should set it if they want */
851 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
852 #endif
853
854 /* if the underlying driver supports mesh, mac80211 will (at least)
855 * provide routing of mesh authentication frames to userspace */
856 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
857 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
858
859 /* mac80211 supports control port protocol changing */
860 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
861
862 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
863 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
864 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
865 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
866
867 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
868 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
869 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
870
871 /*
872 * Calculate scan IE length -- we need this to alloc
873 * memory and to subtract from the driver limit. It
874 * includes the DS Params, (extended) supported rates, and HT
875 * information -- SSID is the driver's responsibility.
876 */
877 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
878 3 /* DS Params */;
879 if (supp_ht)
880 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
881
882 if (supp_vht)
883 local->scan_ies_len +=
884 2 + sizeof(struct ieee80211_vht_cap);
885
886 if (!local->ops->hw_scan) {
887 /* For hw_scan, driver needs to set these up. */
888 local->hw.wiphy->max_scan_ssids = 4;
889 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
890 }
891
892 /*
893 * If the driver supports any scan IEs, then assume the
894 * limit includes the IEs mac80211 will add, otherwise
895 * leave it at zero and let the driver sort it out; we
896 * still pass our IEs to the driver but userspace will
897 * not be allowed to in that case.
898 */
899 if (local->hw.wiphy->max_scan_ie_len)
900 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
901
902 /* Set up cipher suites unless driver already did */
903 if (!local->hw.wiphy->cipher_suites) {
904 local->hw.wiphy->cipher_suites = cipher_suites;
905 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
906 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
907 local->hw.wiphy->n_cipher_suites--;
908 }
909 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
910 if (local->hw.wiphy->cipher_suites == cipher_suites) {
911 local->hw.wiphy->cipher_suites += 2;
912 local->hw.wiphy->n_cipher_suites -= 2;
913 } else {
914 u32 *suites;
915 int r, w = 0;
916
917 /* Filter out WEP */
918
919 suites = kmemdup(
920 local->hw.wiphy->cipher_suites,
921 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
922 GFP_KERNEL);
923 if (!suites) {
924 result = -ENOMEM;
925 goto fail_wiphy_register;
926 }
927 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
928 u32 suite = local->hw.wiphy->cipher_suites[r];
929 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
930 suite == WLAN_CIPHER_SUITE_WEP104)
931 continue;
932 suites[w++] = suite;
933 }
934 local->hw.wiphy->cipher_suites = suites;
935 local->hw.wiphy->n_cipher_suites = w;
936 local->wiphy_ciphers_allocated = true;
937 }
938 }
939
940 if (!local->ops->remain_on_channel)
941 local->hw.wiphy->max_remain_on_channel_duration = 5000;
942
943 if (local->ops->sched_scan_start)
944 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
945
946 /* mac80211 based drivers don't support internal TDLS setup */
947 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
948 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
949
950 result = wiphy_register(local->hw.wiphy);
951 if (result < 0)
952 goto fail_wiphy_register;
953
954 /*
955 * We use the number of queues for feature tests (QoS, HT) internally
956 * so restrict them appropriately.
957 */
958 if (hw->queues > IEEE80211_MAX_QUEUES)
959 hw->queues = IEEE80211_MAX_QUEUES;
960
961 local->workqueue =
962 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
963 if (!local->workqueue) {
964 result = -ENOMEM;
965 goto fail_workqueue;
966 }
967
968 /*
969 * The hardware needs headroom for sending the frame,
970 * and we need some headroom for passing the frame to monitor
971 * interfaces, but never both at the same time.
972 */
973 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
974 IEEE80211_TX_STATUS_HEADROOM);
975
976 debugfs_hw_add(local);
977
978 /*
979 * if the driver doesn't specify a max listen interval we
980 * use 5 which should be a safe default
981 */
982 if (local->hw.max_listen_interval == 0)
983 local->hw.max_listen_interval = 5;
984
985 local->hw.conf.listen_interval = local->hw.max_listen_interval;
986
987 local->dynamic_ps_forced_timeout = -1;
988
989 result = ieee80211_wep_init(local);
990 if (result < 0)
991 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
992 result);
993
994 ieee80211_led_init(local);
995
996 rtnl_lock();
997
998 result = ieee80211_init_rate_ctrl_alg(local,
999 hw->rate_control_algorithm);
1000 if (result < 0) {
1001 wiphy_debug(local->hw.wiphy,
1002 "Failed to initialize rate control algorithm\n");
1003 goto fail_rate;
1004 }
1005
1006 /* add one default STA interface if supported */
1007 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1008 result = ieee80211_if_add(local, "wlan%d", NULL,
1009 NL80211_IFTYPE_STATION, NULL);
1010 if (result)
1011 wiphy_warn(local->hw.wiphy,
1012 "Failed to add default virtual iface\n");
1013 }
1014
1015 rtnl_unlock();
1016
1017 local->network_latency_notifier.notifier_call =
1018 ieee80211_max_network_latency;
1019 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1020 &local->network_latency_notifier);
1021 if (result) {
1022 rtnl_lock();
1023 goto fail_pm_qos;
1024 }
1025
1026 #ifdef CONFIG_INET
1027 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1028 result = register_inetaddr_notifier(&local->ifa_notifier);
1029 if (result)
1030 goto fail_ifa;
1031 #endif
1032
1033 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1034 local->hw.napi_weight);
1035
1036 return 0;
1037
1038 #ifdef CONFIG_INET
1039 fail_ifa:
1040 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1041 &local->network_latency_notifier);
1042 rtnl_lock();
1043 #endif
1044 fail_pm_qos:
1045 ieee80211_led_exit(local);
1046 ieee80211_remove_interfaces(local);
1047 fail_rate:
1048 rtnl_unlock();
1049 ieee80211_wep_free(local);
1050 sta_info_stop(local);
1051 destroy_workqueue(local->workqueue);
1052 fail_workqueue:
1053 wiphy_unregister(local->hw.wiphy);
1054 fail_wiphy_register:
1055 if (local->wiphy_ciphers_allocated)
1056 kfree(local->hw.wiphy->cipher_suites);
1057 kfree(local->int_scan_req);
1058 return result;
1059 }
1060 EXPORT_SYMBOL(ieee80211_register_hw);
1061
1062 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1063 {
1064 struct ieee80211_local *local = hw_to_local(hw);
1065
1066 tasklet_kill(&local->tx_pending_tasklet);
1067 tasklet_kill(&local->tasklet);
1068
1069 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1070 &local->network_latency_notifier);
1071 #ifdef CONFIG_INET
1072 unregister_inetaddr_notifier(&local->ifa_notifier);
1073 #endif
1074
1075 rtnl_lock();
1076
1077 /*
1078 * At this point, interface list manipulations are fine
1079 * because the driver cannot be handing us frames any
1080 * more and the tasklet is killed.
1081 */
1082 ieee80211_remove_interfaces(local);
1083
1084 rtnl_unlock();
1085
1086 cancel_work_sync(&local->restart_work);
1087 cancel_work_sync(&local->reconfig_filter);
1088
1089 ieee80211_clear_tx_pending(local);
1090 rate_control_deinitialize(local);
1091
1092 if (skb_queue_len(&local->skb_queue) ||
1093 skb_queue_len(&local->skb_queue_unreliable))
1094 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1095 skb_queue_purge(&local->skb_queue);
1096 skb_queue_purge(&local->skb_queue_unreliable);
1097 skb_queue_purge(&local->rx_skb_queue);
1098
1099 destroy_workqueue(local->workqueue);
1100 wiphy_unregister(local->hw.wiphy);
1101 sta_info_stop(local);
1102 ieee80211_wep_free(local);
1103 ieee80211_led_exit(local);
1104 kfree(local->int_scan_req);
1105 }
1106 EXPORT_SYMBOL(ieee80211_unregister_hw);
1107
1108 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1109 {
1110 WARN_ONCE(1, "Have pending ack frames!\n");
1111 kfree_skb(p);
1112 return 0;
1113 }
1114
1115 void ieee80211_free_hw(struct ieee80211_hw *hw)
1116 {
1117 struct ieee80211_local *local = hw_to_local(hw);
1118
1119 mutex_destroy(&local->iflist_mtx);
1120 mutex_destroy(&local->mtx);
1121
1122 if (local->wiphy_ciphers_allocated)
1123 kfree(local->hw.wiphy->cipher_suites);
1124
1125 idr_for_each(&local->ack_status_frames,
1126 ieee80211_free_ack_frame, NULL);
1127 idr_destroy(&local->ack_status_frames);
1128
1129 wiphy_free(local->hw.wiphy);
1130 }
1131 EXPORT_SYMBOL(ieee80211_free_hw);
1132
1133 static int __init ieee80211_init(void)
1134 {
1135 struct sk_buff *skb;
1136 int ret;
1137
1138 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1139 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1140 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1141
1142 ret = rc80211_minstrel_init();
1143 if (ret)
1144 return ret;
1145
1146 ret = rc80211_minstrel_ht_init();
1147 if (ret)
1148 goto err_minstrel;
1149
1150 ret = rc80211_pid_init();
1151 if (ret)
1152 goto err_pid;
1153
1154 ret = ieee80211_iface_init();
1155 if (ret)
1156 goto err_netdev;
1157
1158 return 0;
1159 err_netdev:
1160 rc80211_pid_exit();
1161 err_pid:
1162 rc80211_minstrel_ht_exit();
1163 err_minstrel:
1164 rc80211_minstrel_exit();
1165
1166 return ret;
1167 }
1168
1169 static void __exit ieee80211_exit(void)
1170 {
1171 rc80211_pid_exit();
1172 rc80211_minstrel_ht_exit();
1173 rc80211_minstrel_exit();
1174
1175 if (mesh_allocated)
1176 ieee80211s_stop();
1177
1178 ieee80211_iface_exit();
1179
1180 rcu_barrier();
1181 }
1182
1183
1184 subsys_initcall(ieee80211_init);
1185 module_exit(ieee80211_exit);
1186
1187 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1188 MODULE_LICENSE("GPL");
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