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mac80211: allow userspace registration for probe requests in IBSS
[linux-2.6.git] / net / mac80211 / main.c
blob4ece42ca87bbcacc94b2f3ebe4cb2dfa2244a5ed
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_sub_if_data *sdata;
99 struct ieee80211_channel *chan;
100 u32 changed = 0;
101 int power;
102 enum nl80211_channel_type channel_type;
103 u32 offchannel_flag;
104 bool scanning = false;
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 = NL80211_CHAN_NO_HT;
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 scanning = 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
156 rcu_read_lock();
157 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
158 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
159 continue;
160 power = min(power, sdata->vif.bss_conf.txpower);
161 }
162 rcu_read_unlock();
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 return changed;
170 }
171
172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
173 {
174 int ret = 0;
175
176 might_sleep();
177
178 if (!local->use_chanctx)
179 changed |= ieee80211_hw_conf_chan(local);
180 else
181 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
182 IEEE80211_CONF_CHANGE_POWER);
183
184 if (changed && local->open_count) {
185 ret = drv_config(local, changed);
186 /*
187 * Goal:
188 * HW reconfiguration should never fail, the driver has told
189 * us what it can support so it should live up to that promise.
190 *
191 * Current status:
192 * rfkill is not integrated with mac80211 and a
193 * configuration command can thus fail if hardware rfkill
194 * is enabled
195 *
196 * FIXME: integrate rfkill with mac80211 and then add this
197 * WARN_ON() back
198 *
199 */
200 /* WARN_ON(ret); */
201 }
202
203 return ret;
204 }
205
206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
207 u32 changed)
208 {
209 struct ieee80211_local *local = sdata->local;
210 static const u8 zero[ETH_ALEN] = { 0 };
211
212 if (!changed)
213 return;
214
215 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
216 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
217 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
218 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
219 else if (sdata->vif.type == NL80211_IFTYPE_AP)
220 sdata->vif.bss_conf.bssid = sdata->vif.addr;
221 else if (sdata->vif.type == NL80211_IFTYPE_WDS)
222 sdata->vif.bss_conf.bssid = NULL;
223 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
224 sdata->vif.bss_conf.bssid = zero;
225 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
226 sdata->vif.bss_conf.bssid = sdata->vif.addr;
227 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
228 "P2P Device BSS changed %#x", changed);
229 } else {
230 WARN_ON(1);
231 return;
232 }
233
234 switch (sdata->vif.type) {
235 case NL80211_IFTYPE_AP:
236 case NL80211_IFTYPE_ADHOC:
237 case NL80211_IFTYPE_WDS:
238 case NL80211_IFTYPE_MESH_POINT:
239 break;
240 default:
241 /* do not warn to simplify caller in scan.c */
242 changed &= ~BSS_CHANGED_BEACON_ENABLED;
243 if (WARN_ON(changed & BSS_CHANGED_BEACON))
244 return;
245 break;
246 }
247
248 if (changed & BSS_CHANGED_BEACON_ENABLED) {
249 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
250 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
251 sdata->vif.bss_conf.enable_beacon = false;
252 } else {
253 /*
254 * Beacon should be enabled, but AP mode must
255 * check whether there is a beacon configured.
256 */
257 switch (sdata->vif.type) {
258 case NL80211_IFTYPE_AP:
259 sdata->vif.bss_conf.enable_beacon =
260 !!sdata->u.ap.beacon;
261 break;
262 case NL80211_IFTYPE_ADHOC:
263 sdata->vif.bss_conf.enable_beacon =
264 !!sdata->u.ibss.presp;
265 break;
266 #ifdef CONFIG_MAC80211_MESH
267 case NL80211_IFTYPE_MESH_POINT:
268 sdata->vif.bss_conf.enable_beacon =
269 !!sdata->u.mesh.mesh_id_len;
270 break;
271 #endif
272 default:
273 /* not reached */
274 WARN_ON(1);
275 break;
276 }
277 }
278 }
279
280 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
281 }
282
283 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
284 {
285 sdata->vif.bss_conf.use_cts_prot = false;
286 sdata->vif.bss_conf.use_short_preamble = false;
287 sdata->vif.bss_conf.use_short_slot = false;
288 return BSS_CHANGED_ERP_CTS_PROT |
289 BSS_CHANGED_ERP_PREAMBLE |
290 BSS_CHANGED_ERP_SLOT;
291 }
292
293 static void ieee80211_tasklet_handler(unsigned long data)
294 {
295 struct ieee80211_local *local = (struct ieee80211_local *) data;
296 struct sta_info *sta, *tmp;
297 struct skb_eosp_msg_data *eosp_data;
298 struct sk_buff *skb;
299
300 while ((skb = skb_dequeue(&local->skb_queue)) ||
301 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
302 switch (skb->pkt_type) {
303 case IEEE80211_RX_MSG:
304 /* Clear skb->pkt_type in order to not confuse kernel
305 * netstack. */
306 skb->pkt_type = 0;
307 ieee80211_rx(&local->hw, skb);
308 break;
309 case IEEE80211_TX_STATUS_MSG:
310 skb->pkt_type = 0;
311 ieee80211_tx_status(&local->hw, skb);
312 break;
313 case IEEE80211_EOSP_MSG:
314 eosp_data = (void *)skb->cb;
315 for_each_sta_info(local, eosp_data->sta, sta, tmp) {
316 /* skip wrong virtual interface */
317 if (memcmp(eosp_data->iface,
318 sta->sdata->vif.addr, ETH_ALEN))
319 continue;
320 clear_sta_flag(sta, WLAN_STA_SP);
321 break;
322 }
323 dev_kfree_skb(skb);
324 break;
325 default:
326 WARN(1, "mac80211: Packet is of unknown type %d\n",
327 skb->pkt_type);
328 dev_kfree_skb(skb);
329 break;
330 }
331 }
332 }
333
334 static void ieee80211_restart_work(struct work_struct *work)
335 {
336 struct ieee80211_local *local =
337 container_of(work, struct ieee80211_local, restart_work);
338
339 /* wait for scan work complete */
340 flush_workqueue(local->workqueue);
341
342 mutex_lock(&local->mtx);
343 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
344 rcu_dereference_protected(local->sched_scan_sdata,
345 lockdep_is_held(&local->mtx)),
346 "%s called with hardware scan in progress\n", __func__);
347 mutex_unlock(&local->mtx);
348
349 rtnl_lock();
350 ieee80211_scan_cancel(local);
351 ieee80211_reconfig(local);
352 rtnl_unlock();
353 }
354
355 void ieee80211_restart_hw(struct ieee80211_hw *hw)
356 {
357 struct ieee80211_local *local = hw_to_local(hw);
358
359 trace_api_restart_hw(local);
360
361 wiphy_info(hw->wiphy,
362 "Hardware restart was requested\n");
363
364 /* use this reason, ieee80211_reconfig will unblock it */
365 ieee80211_stop_queues_by_reason(hw,
366 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
367
368 /*
369 * Stop all Rx during the reconfig. We don't want state changes
370 * or driver callbacks while this is in progress.
371 */
372 local->in_reconfig = true;
373 barrier();
374
375 schedule_work(&local->restart_work);
376 }
377 EXPORT_SYMBOL(ieee80211_restart_hw);
378
379 #ifdef CONFIG_INET
380 static int ieee80211_ifa_changed(struct notifier_block *nb,
381 unsigned long data, void *arg)
382 {
383 struct in_ifaddr *ifa = arg;
384 struct ieee80211_local *local =
385 container_of(nb, struct ieee80211_local,
386 ifa_notifier);
387 struct net_device *ndev = ifa->ifa_dev->dev;
388 struct wireless_dev *wdev = ndev->ieee80211_ptr;
389 struct in_device *idev;
390 struct ieee80211_sub_if_data *sdata;
391 struct ieee80211_bss_conf *bss_conf;
392 struct ieee80211_if_managed *ifmgd;
393 int c = 0;
394
395 /* Make sure it's our interface that got changed */
396 if (!wdev)
397 return NOTIFY_DONE;
398
399 if (wdev->wiphy != local->hw.wiphy)
400 return NOTIFY_DONE;
401
402 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
403 bss_conf = &sdata->vif.bss_conf;
404
405 /* ARP filtering is only supported in managed mode */
406 if (sdata->vif.type != NL80211_IFTYPE_STATION)
407 return NOTIFY_DONE;
408
409 idev = __in_dev_get_rtnl(sdata->dev);
410 if (!idev)
411 return NOTIFY_DONE;
412
413 ifmgd = &sdata->u.mgd;
414 mutex_lock(&ifmgd->mtx);
415
416 /* Copy the addresses to the bss_conf list */
417 ifa = idev->ifa_list;
418 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
419 bss_conf->arp_addr_list[c] = ifa->ifa_address;
420 ifa = ifa->ifa_next;
421 c++;
422 }
423
424 /* If not all addresses fit the list, disable filtering */
425 if (ifa) {
426 sdata->arp_filter_state = false;
427 c = 0;
428 } else {
429 sdata->arp_filter_state = true;
430 }
431 bss_conf->arp_addr_cnt = c;
432
433 /* Configure driver only if associated (which also implies it is up) */
434 if (ifmgd->associated) {
435 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
436 ieee80211_bss_info_change_notify(sdata,
437 BSS_CHANGED_ARP_FILTER);
438 }
439
440 mutex_unlock(&ifmgd->mtx);
441
442 return NOTIFY_DONE;
443 }
444 #endif
445
446 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
447 {
448 struct ieee80211_local *local =
449 container_of(napi, struct ieee80211_local, napi);
450
451 return local->ops->napi_poll(&local->hw, budget);
452 }
453
454 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
455 {
456 struct ieee80211_local *local = hw_to_local(hw);
457
458 napi_schedule(&local->napi);
459 }
460 EXPORT_SYMBOL(ieee80211_napi_schedule);
461
462 void ieee80211_napi_complete(struct ieee80211_hw *hw)
463 {
464 struct ieee80211_local *local = hw_to_local(hw);
465
466 napi_complete(&local->napi);
467 }
468 EXPORT_SYMBOL(ieee80211_napi_complete);
469
470 /* There isn't a lot of sense in it, but you can transmit anything you like */
471 static const struct ieee80211_txrx_stypes
472 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
473 [NL80211_IFTYPE_ADHOC] = {
474 .tx = 0xffff,
475 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
476 BIT(IEEE80211_STYPE_AUTH >> 4) |
477 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
478 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
479 },
480 [NL80211_IFTYPE_STATION] = {
481 .tx = 0xffff,
482 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
483 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
484 },
485 [NL80211_IFTYPE_AP] = {
486 .tx = 0xffff,
487 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
488 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
489 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
490 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
491 BIT(IEEE80211_STYPE_AUTH >> 4) |
492 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
493 BIT(IEEE80211_STYPE_ACTION >> 4),
494 },
495 [NL80211_IFTYPE_AP_VLAN] = {
496 /* copy AP */
497 .tx = 0xffff,
498 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
499 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
500 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
501 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
502 BIT(IEEE80211_STYPE_AUTH >> 4) |
503 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
504 BIT(IEEE80211_STYPE_ACTION >> 4),
505 },
506 [NL80211_IFTYPE_P2P_CLIENT] = {
507 .tx = 0xffff,
508 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
509 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
510 },
511 [NL80211_IFTYPE_P2P_GO] = {
512 .tx = 0xffff,
513 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
514 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
515 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
516 BIT(IEEE80211_STYPE_DISASSOC >> 4) |
517 BIT(IEEE80211_STYPE_AUTH >> 4) |
518 BIT(IEEE80211_STYPE_DEAUTH >> 4) |
519 BIT(IEEE80211_STYPE_ACTION >> 4),
520 },
521 [NL80211_IFTYPE_MESH_POINT] = {
522 .tx = 0xffff,
523 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
524 BIT(IEEE80211_STYPE_AUTH >> 4) |
525 BIT(IEEE80211_STYPE_DEAUTH >> 4),
526 },
527 [NL80211_IFTYPE_P2P_DEVICE] = {
528 .tx = 0xffff,
529 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
530 BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
531 },
532 };
533
534 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
535 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
536 IEEE80211_HT_AMPDU_PARM_DENSITY,
537
538 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
539 IEEE80211_HT_CAP_MAX_AMSDU |
540 IEEE80211_HT_CAP_SGI_40),
541 .mcs = {
542 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
543 0xff, 0xff, 0xff, 0xff, 0xff, },
544 },
545 };
546
547 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
548 const struct ieee80211_ops *ops)
549 {
550 struct ieee80211_local *local;
551 int priv_size, i;
552 struct wiphy *wiphy;
553 bool use_chanctx;
554
555 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
556 !ops->add_interface || !ops->remove_interface ||
557 !ops->configure_filter))
558 return NULL;
559
560 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
561 return NULL;
562
563 /* check all or no channel context operations exist */
564 i = !!ops->add_chanctx + !!ops->remove_chanctx +
565 !!ops->change_chanctx + !!ops->assign_vif_chanctx +
566 !!ops->unassign_vif_chanctx;
567 if (WARN_ON(i != 0 && i != 5))
568 return NULL;
569 use_chanctx = i == 5;
570
571 /* Ensure 32-byte alignment of our private data and hw private data.
572 * We use the wiphy priv data for both our ieee80211_local and for
573 * the driver's private data
574 *
575 * In memory it'll be like this:
576 *
577 * +-------------------------+
578 * | struct wiphy |
579 * +-------------------------+
580 * | struct ieee80211_local |
581 * +-------------------------+
582 * | driver's private data |
583 * +-------------------------+
584 *
585 */
586 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
587
588 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
589
590 if (!wiphy)
591 return NULL;
592
593 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
594
595 wiphy->privid = mac80211_wiphy_privid;
596
597 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
598 WIPHY_FLAG_4ADDR_AP |
599 WIPHY_FLAG_4ADDR_STATION |
600 WIPHY_FLAG_REPORTS_OBSS |
601 WIPHY_FLAG_OFFCHAN_TX;
602
603 if (ops->remain_on_channel)
604 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
605
606 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
607 NL80211_FEATURE_SAE |
608 NL80211_FEATURE_HT_IBSS |
609 NL80211_FEATURE_VIF_TXPOWER;
610
611 if (!ops->hw_scan)
612 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
613 NL80211_FEATURE_AP_SCAN;
614
615
616 if (!ops->set_key)
617 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
618
619 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
620
621 local = wiphy_priv(wiphy);
622
623 local->hw.wiphy = wiphy;
624
625 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
626
627 local->ops = ops;
628 local->use_chanctx = use_chanctx;
629
630 /* set up some defaults */
631 local->hw.queues = 1;
632 local->hw.max_rates = 1;
633 local->hw.max_report_rates = 0;
634 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
635 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
636 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
637 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
638 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
639 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
640 IEEE80211_RADIOTAP_MCS_HAVE_GI |
641 IEEE80211_RADIOTAP_MCS_HAVE_BW;
642 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
643 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
644 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
645 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
646
647 INIT_LIST_HEAD(&local->interfaces);
648
649 __hw_addr_init(&local->mc_list);
650
651 mutex_init(&local->iflist_mtx);
652 mutex_init(&local->mtx);
653
654 mutex_init(&local->key_mtx);
655 spin_lock_init(&local->filter_lock);
656 spin_lock_init(&local->queue_stop_reason_lock);
657
658 INIT_LIST_HEAD(&local->chanctx_list);
659 mutex_init(&local->chanctx_mtx);
660
661 /*
662 * The rx_skb_queue is only accessed from tasklets,
663 * but other SKB queues are used from within IRQ
664 * context. Therefore, this one needs a different
665 * locking class so our direct, non-irq-safe use of
666 * the queue's lock doesn't throw lockdep warnings.
667 */
668 skb_queue_head_init_class(&local->rx_skb_queue,
669 &ieee80211_rx_skb_queue_class);
670
671 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
672
673 INIT_WORK(&local->restart_work, ieee80211_restart_work);
674
675 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
676 local->smps_mode = IEEE80211_SMPS_OFF;
677
678 INIT_WORK(&local->dynamic_ps_enable_work,
679 ieee80211_dynamic_ps_enable_work);
680 INIT_WORK(&local->dynamic_ps_disable_work,
681 ieee80211_dynamic_ps_disable_work);
682 setup_timer(&local->dynamic_ps_timer,
683 ieee80211_dynamic_ps_timer, (unsigned long) local);
684
685 INIT_WORK(&local->sched_scan_stopped_work,
686 ieee80211_sched_scan_stopped_work);
687
688 spin_lock_init(&local->ack_status_lock);
689 idr_init(&local->ack_status_frames);
690 /* preallocate at least one entry */
691 idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
692
693 sta_info_init(local);
694
695 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
696 skb_queue_head_init(&local->pending[i]);
697 atomic_set(&local->agg_queue_stop[i], 0);
698 }
699 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
700 (unsigned long)local);
701
702 tasklet_init(&local->tasklet,
703 ieee80211_tasklet_handler,
704 (unsigned long) local);
705
706 skb_queue_head_init(&local->skb_queue);
707 skb_queue_head_init(&local->skb_queue_unreliable);
708
709 /* init dummy netdev for use w/ NAPI */
710 init_dummy_netdev(&local->napi_dev);
711
712 ieee80211_led_names(local);
713
714 ieee80211_roc_setup(local);
715
716 return &local->hw;
717 }
718 EXPORT_SYMBOL(ieee80211_alloc_hw);
719
720 int ieee80211_register_hw(struct ieee80211_hw *hw)
721 {
722 struct ieee80211_local *local = hw_to_local(hw);
723 int result, i;
724 enum ieee80211_band band;
725 int channels, max_bitrates;
726 bool supp_ht, supp_vht;
727 netdev_features_t feature_whitelist;
728 static const u32 cipher_suites[] = {
729 /* keep WEP first, it may be removed below */
730 WLAN_CIPHER_SUITE_WEP40,
731 WLAN_CIPHER_SUITE_WEP104,
732 WLAN_CIPHER_SUITE_TKIP,
733 WLAN_CIPHER_SUITE_CCMP,
734
735 /* keep last -- depends on hw flags! */
736 WLAN_CIPHER_SUITE_AES_CMAC
737 };
738
739 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
740 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
741 local->hw.offchannel_tx_hw_queue >= local->hw.queues))
742 return -EINVAL;
743
744 #ifdef CONFIG_PM
745 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
746 (!local->ops->suspend || !local->ops->resume))
747 return -EINVAL;
748 #endif
749
750 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
751 return -EINVAL;
752
753 if (!local->use_chanctx) {
754 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
755 const struct ieee80211_iface_combination *comb;
756
757 comb = &local->hw.wiphy->iface_combinations[i];
758
759 if (comb->num_different_channels > 1)
760 return -EINVAL;
761 }
762 } else {
763 /*
764 * WDS is currently prohibited when channel contexts are used
765 * because there's no clear definition of which channel WDS
766 * type interfaces use
767 */
768 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
769 return -EINVAL;
770 }
771
772 /* Only HW csum features are currently compatible with mac80211 */
773 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
774 NETIF_F_HW_CSUM;
775 if (WARN_ON(hw->netdev_features & ~feature_whitelist))
776 return -EINVAL;
777
778 if (hw->max_report_rates == 0)
779 hw->max_report_rates = hw->max_rates;
780
781 local->rx_chains = 1;
782
783 /*
784 * generic code guarantees at least one band,
785 * set this very early because much code assumes
786 * that hw.conf.channel is assigned
787 */
788 channels = 0;
789 max_bitrates = 0;
790 supp_ht = false;
791 supp_vht = false;
792 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
793 struct ieee80211_supported_band *sband;
794
795 sband = local->hw.wiphy->bands[band];
796 if (!sband)
797 continue;
798 if (!local->use_chanctx && !local->_oper_channel) {
799 /* init channel we're on */
800 local->hw.conf.channel =
801 local->_oper_channel = &sband->channels[0];
802 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
803 }
804 cfg80211_chandef_create(&local->monitor_chandef,
805 &sband->channels[0],
806 NL80211_CHAN_NO_HT);
807 channels += sband->n_channels;
808
809 if (max_bitrates < sband->n_bitrates)
810 max_bitrates = sband->n_bitrates;
811 supp_ht = supp_ht || sband->ht_cap.ht_supported;
812 supp_vht = supp_vht || sband->vht_cap.vht_supported;
813
814 if (sband->ht_cap.ht_supported)
815 local->rx_chains =
816 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
817 local->rx_chains);
818
819 /* TODO: consider VHT for RX chains, hopefully it's the same */
820 }
821
822 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
823 sizeof(void *) * channels, GFP_KERNEL);
824 if (!local->int_scan_req)
825 return -ENOMEM;
826
827 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
828 if (!local->hw.wiphy->bands[band])
829 continue;
830 local->int_scan_req->rates[band] = (u32) -1;
831 }
832
833 /* if low-level driver supports AP, we also support VLAN */
834 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
835 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
836 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
837 }
838
839 /* mac80211 always supports monitor */
840 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
841 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
842
843 /* mac80211 doesn't support more than one IBSS interface right now */
844 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
845 const struct ieee80211_iface_combination *c;
846 int j;
847
848 c = &hw->wiphy->iface_combinations[i];
849
850 for (j = 0; j < c->n_limits; j++)
851 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
852 c->limits[j].max > 1)
853 return -EINVAL;
854 }
855
856 #ifndef CONFIG_MAC80211_MESH
857 /* mesh depends on Kconfig, but drivers should set it if they want */
858 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
859 #endif
860
861 /* if the underlying driver supports mesh, mac80211 will (at least)
862 * provide routing of mesh authentication frames to userspace */
863 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
864 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
865
866 /* mac80211 supports control port protocol changing */
867 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
868
869 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
870 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
871 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
872 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
873
874 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
875 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
876 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
877
878 /*
879 * Calculate scan IE length -- we need this to alloc
880 * memory and to subtract from the driver limit. It
881 * includes the DS Params, (extended) supported rates, and HT
882 * information -- SSID is the driver's responsibility.
883 */
884 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
885 3 /* DS Params */;
886 if (supp_ht)
887 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
888
889 if (supp_vht) {
890 local->scan_ies_len +=
891 2 + sizeof(struct ieee80211_vht_cap);
892
893 /*
894 * (for now at least), drivers wanting to use VHT must
895 * support channel contexts, as they contain all the
896 * necessary VHT information and the global hw config
897 * doesn't (yet)
898 */
899 if (WARN_ON(!local->use_chanctx)) {
900 result = -EINVAL;
901 goto fail_wiphy_register;
902 }
903 }
904
905 if (!local->ops->hw_scan) {
906 /* For hw_scan, driver needs to set these up. */
907 local->hw.wiphy->max_scan_ssids = 4;
908 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
909 }
910
911 /*
912 * If the driver supports any scan IEs, then assume the
913 * limit includes the IEs mac80211 will add, otherwise
914 * leave it at zero and let the driver sort it out; we
915 * still pass our IEs to the driver but userspace will
916 * not be allowed to in that case.
917 */
918 if (local->hw.wiphy->max_scan_ie_len)
919 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
920
921 /* Set up cipher suites unless driver already did */
922 if (!local->hw.wiphy->cipher_suites) {
923 local->hw.wiphy->cipher_suites = cipher_suites;
924 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
925 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
926 local->hw.wiphy->n_cipher_suites--;
927 }
928 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
929 if (local->hw.wiphy->cipher_suites == cipher_suites) {
930 local->hw.wiphy->cipher_suites += 2;
931 local->hw.wiphy->n_cipher_suites -= 2;
932 } else {
933 u32 *suites;
934 int r, w = 0;
935
936 /* Filter out WEP */
937
938 suites = kmemdup(
939 local->hw.wiphy->cipher_suites,
940 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
941 GFP_KERNEL);
942 if (!suites)
943 return -ENOMEM;
944 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
945 u32 suite = local->hw.wiphy->cipher_suites[r];
946 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
947 suite == WLAN_CIPHER_SUITE_WEP104)
948 continue;
949 suites[w++] = suite;
950 }
951 local->hw.wiphy->cipher_suites = suites;
952 local->hw.wiphy->n_cipher_suites = w;
953 local->wiphy_ciphers_allocated = true;
954 }
955 }
956
957 if (!local->ops->remain_on_channel)
958 local->hw.wiphy->max_remain_on_channel_duration = 5000;
959
960 if (local->ops->sched_scan_start)
961 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
962
963 /* mac80211 based drivers don't support internal TDLS setup */
964 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
965 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
966
967 result = wiphy_register(local->hw.wiphy);
968 if (result < 0)
969 goto fail_wiphy_register;
970
971 /*
972 * We use the number of queues for feature tests (QoS, HT) internally
973 * so restrict them appropriately.
974 */
975 if (hw->queues > IEEE80211_MAX_QUEUES)
976 hw->queues = IEEE80211_MAX_QUEUES;
977
978 local->workqueue =
979 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
980 if (!local->workqueue) {
981 result = -ENOMEM;
982 goto fail_workqueue;
983 }
984
985 /*
986 * The hardware needs headroom for sending the frame,
987 * and we need some headroom for passing the frame to monitor
988 * interfaces, but never both at the same time.
989 */
990 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
991 IEEE80211_TX_STATUS_HEADROOM);
992
993 debugfs_hw_add(local);
994
995 /*
996 * if the driver doesn't specify a max listen interval we
997 * use 5 which should be a safe default
998 */
999 if (local->hw.max_listen_interval == 0)
1000 local->hw.max_listen_interval = 5;
1001
1002 local->hw.conf.listen_interval = local->hw.max_listen_interval;
1003
1004 local->dynamic_ps_forced_timeout = -1;
1005
1006 result = ieee80211_wep_init(local);
1007 if (result < 0)
1008 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1009 result);
1010
1011 ieee80211_led_init(local);
1012
1013 rtnl_lock();
1014
1015 result = ieee80211_init_rate_ctrl_alg(local,
1016 hw->rate_control_algorithm);
1017 if (result < 0) {
1018 wiphy_debug(local->hw.wiphy,
1019 "Failed to initialize rate control algorithm\n");
1020 goto fail_rate;
1021 }
1022
1023 /* add one default STA interface if supported */
1024 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1025 result = ieee80211_if_add(local, "wlan%d", NULL,
1026 NL80211_IFTYPE_STATION, NULL);
1027 if (result)
1028 wiphy_warn(local->hw.wiphy,
1029 "Failed to add default virtual iface\n");
1030 }
1031
1032 rtnl_unlock();
1033
1034 local->network_latency_notifier.notifier_call =
1035 ieee80211_max_network_latency;
1036 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1037 &local->network_latency_notifier);
1038 if (result) {
1039 rtnl_lock();
1040 goto fail_pm_qos;
1041 }
1042
1043 #ifdef CONFIG_INET
1044 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1045 result = register_inetaddr_notifier(&local->ifa_notifier);
1046 if (result)
1047 goto fail_ifa;
1048 #endif
1049
1050 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1051 local->hw.napi_weight);
1052
1053 return 0;
1054
1055 #ifdef CONFIG_INET
1056 fail_ifa:
1057 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1058 &local->network_latency_notifier);
1059 rtnl_lock();
1060 #endif
1061 fail_pm_qos:
1062 ieee80211_led_exit(local);
1063 ieee80211_remove_interfaces(local);
1064 fail_rate:
1065 rtnl_unlock();
1066 ieee80211_wep_free(local);
1067 sta_info_stop(local);
1068 destroy_workqueue(local->workqueue);
1069 fail_workqueue:
1070 wiphy_unregister(local->hw.wiphy);
1071 fail_wiphy_register:
1072 if (local->wiphy_ciphers_allocated)
1073 kfree(local->hw.wiphy->cipher_suites);
1074 kfree(local->int_scan_req);
1075 return result;
1076 }
1077 EXPORT_SYMBOL(ieee80211_register_hw);
1078
1079 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1080 {
1081 struct ieee80211_local *local = hw_to_local(hw);
1082
1083 tasklet_kill(&local->tx_pending_tasklet);
1084 tasklet_kill(&local->tasklet);
1085
1086 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1087 &local->network_latency_notifier);
1088 #ifdef CONFIG_INET
1089 unregister_inetaddr_notifier(&local->ifa_notifier);
1090 #endif
1091
1092 rtnl_lock();
1093
1094 /*
1095 * At this point, interface list manipulations are fine
1096 * because the driver cannot be handing us frames any
1097 * more and the tasklet is killed.
1098 */
1099 ieee80211_remove_interfaces(local);
1100
1101 rtnl_unlock();
1102
1103 cancel_work_sync(&local->restart_work);
1104 cancel_work_sync(&local->reconfig_filter);
1105
1106 ieee80211_clear_tx_pending(local);
1107 rate_control_deinitialize(local);
1108
1109 if (skb_queue_len(&local->skb_queue) ||
1110 skb_queue_len(&local->skb_queue_unreliable))
1111 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1112 skb_queue_purge(&local->skb_queue);
1113 skb_queue_purge(&local->skb_queue_unreliable);
1114 skb_queue_purge(&local->rx_skb_queue);
1115
1116 destroy_workqueue(local->workqueue);
1117 wiphy_unregister(local->hw.wiphy);
1118 sta_info_stop(local);
1119 ieee80211_wep_free(local);
1120 ieee80211_led_exit(local);
1121 kfree(local->int_scan_req);
1122 }
1123 EXPORT_SYMBOL(ieee80211_unregister_hw);
1124
1125 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1126 {
1127 WARN_ONCE(1, "Have pending ack frames!\n");
1128 kfree_skb(p);
1129 return 0;
1130 }
1131
1132 void ieee80211_free_hw(struct ieee80211_hw *hw)
1133 {
1134 struct ieee80211_local *local = hw_to_local(hw);
1135
1136 mutex_destroy(&local->iflist_mtx);
1137 mutex_destroy(&local->mtx);
1138
1139 if (local->wiphy_ciphers_allocated)
1140 kfree(local->hw.wiphy->cipher_suites);
1141
1142 idr_for_each(&local->ack_status_frames,
1143 ieee80211_free_ack_frame, NULL);
1144 idr_destroy(&local->ack_status_frames);
1145
1146 wiphy_free(local->hw.wiphy);
1147 }
1148 EXPORT_SYMBOL(ieee80211_free_hw);
1149
1150 static int __init ieee80211_init(void)
1151 {
1152 struct sk_buff *skb;
1153 int ret;
1154
1155 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1156 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1157 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1158
1159 ret = rc80211_minstrel_init();
1160 if (ret)
1161 return ret;
1162
1163 ret = rc80211_minstrel_ht_init();
1164 if (ret)
1165 goto err_minstrel;
1166
1167 ret = rc80211_pid_init();
1168 if (ret)
1169 goto err_pid;
1170
1171 ret = ieee80211_iface_init();
1172 if (ret)
1173 goto err_netdev;
1174
1175 return 0;
1176 err_netdev:
1177 rc80211_pid_exit();
1178 err_pid:
1179 rc80211_minstrel_ht_exit();
1180 err_minstrel:
1181 rc80211_minstrel_exit();
1182
1183 return ret;
1184 }
1185
1186 static void __exit ieee80211_exit(void)
1187 {
1188 rc80211_pid_exit();
1189 rc80211_minstrel_ht_exit();
1190 rc80211_minstrel_exit();
1191
1192 if (mesh_allocated)
1193 ieee80211s_stop();
1194
1195 ieee80211_iface_exit();
1196
1197 rcu_barrier();
1198 }
1199
1200
1201 subsys_initcall(ieee80211_init);
1202 module_exit(ieee80211_exit);
1203
1204 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1205 MODULE_LICENSE("GPL");
Linus' kernel tree