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85c3ca33333eae4eb9277d9a14064a2ed08e7fdd
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_MAX_PROBE_TRIES 5
32
33 /*
34 * beacon loss detection timeout
35 * XXX: should depend on beacon interval
36 */
37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
38 /*
39 * Time the connection can be idle before we probe
40 * it to see if we can still talk to the AP.
41 */
42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
43 /*
44 * Time we wait for a probe response after sending
45 * a probe request because of beacon loss or for
46 * checking the connection still works.
47 */
48 #define IEEE80211_PROBE_WAIT (HZ / 2)
49
50 /*
51 * Weight given to the latest Beacon frame when calculating average signal
52 * strength for Beacon frames received in the current BSS. This must be
53 * between 1 and 15.
54 */
55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
56
57 #define TMR_RUNNING_TIMER 0
58 #define TMR_RUNNING_CHANSW 1
59
60 /*
61 * All cfg80211 functions have to be called outside a locked
62 * section so that they can acquire a lock themselves... This
63 * is much simpler than queuing up things in cfg80211, but we
64 * do need some indirection for that here.
65 */
66 enum rx_mgmt_action {
67 /* no action required */
68 RX_MGMT_NONE,
69
70 /* caller must call cfg80211_send_rx_auth() */
71 RX_MGMT_CFG80211_AUTH,
72
73 /* caller must call cfg80211_send_rx_assoc() */
74 RX_MGMT_CFG80211_ASSOC,
75
76 /* caller must call cfg80211_send_deauth() */
77 RX_MGMT_CFG80211_DEAUTH,
78
79 /* caller must call cfg80211_send_disassoc() */
80 RX_MGMT_CFG80211_DISASSOC,
81
82 /* caller must tell cfg80211 about internal error */
83 RX_MGMT_CFG80211_ASSOC_ERROR,
84 };
85
86 /* utils */
87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
88 {
89 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
90 }
91
92 /*
93 * We can have multiple work items (and connection probing)
94 * scheduling this timer, but we need to take care to only
95 * reschedule it when it should fire _earlier_ than it was
96 * asked for before, or if it's not pending right now. This
97 * function ensures that. Note that it then is required to
98 * run this function for all timeouts after the first one
99 * has happened -- the work that runs from this timer will
100 * do that.
101 */
102 static void run_again(struct ieee80211_if_managed *ifmgd,
103 unsigned long timeout)
104 {
105 ASSERT_MGD_MTX(ifmgd);
106
107 if (!timer_pending(&ifmgd->timer) ||
108 time_before(timeout, ifmgd->timer.expires))
109 mod_timer(&ifmgd->timer, timeout);
110 }
111
112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
113 {
114 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
119 }
120
121 static int ecw2cw(int ecw)
122 {
123 return (1 << ecw) - 1;
124 }
125
126 /*
127 * ieee80211_enable_ht should be called only after the operating band
128 * has been determined as ht configuration depends on the hw's
129 * HT abilities for a specific band.
130 */
131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
132 struct ieee80211_ht_info *hti,
133 const u8 *bssid, u16 ap_ht_cap_flags)
134 {
135 struct ieee80211_local *local = sdata->local;
136 struct ieee80211_supported_band *sband;
137 struct sta_info *sta;
138 u32 changed = 0;
139 u16 ht_opmode;
140 bool enable_ht = true;
141 enum nl80211_channel_type prev_chantype;
142 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
143
144 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
145
146 prev_chantype = sdata->vif.bss_conf.channel_type;
147
148 /* HT is not supported */
149 if (!sband->ht_cap.ht_supported)
150 enable_ht = false;
151
152 /* check that channel matches the right operating channel */
153 if (local->hw.conf.channel->center_freq !=
154 ieee80211_channel_to_frequency(hti->control_chan))
155 enable_ht = false;
156
157 if (enable_ht) {
158 channel_type = NL80211_CHAN_HT20;
159
160 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
161 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
162 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
163 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
164 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
165 if (!(local->hw.conf.channel->flags &
166 IEEE80211_CHAN_NO_HT40PLUS))
167 channel_type = NL80211_CHAN_HT40PLUS;
168 break;
169 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
170 if (!(local->hw.conf.channel->flags &
171 IEEE80211_CHAN_NO_HT40MINUS))
172 channel_type = NL80211_CHAN_HT40MINUS;
173 break;
174 }
175 }
176 }
177
178 if (local->tmp_channel)
179 local->tmp_channel_type = channel_type;
180
181 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
182 /* can only fail due to HT40+/- mismatch */
183 channel_type = NL80211_CHAN_HT20;
184 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
185 }
186
187 /* channel_type change automatically detected */
188 ieee80211_hw_config(local, 0);
189
190 if (prev_chantype != channel_type) {
191 rcu_read_lock();
192 sta = sta_info_get(sdata, bssid);
193 if (sta)
194 rate_control_rate_update(local, sband, sta,
195 IEEE80211_RC_HT_CHANGED,
196 channel_type);
197 rcu_read_unlock();
198 }
199
200 ht_opmode = le16_to_cpu(hti->operation_mode);
201
202 /* if bss configuration changed store the new one */
203 if (sdata->ht_opmode_valid != enable_ht ||
204 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
205 prev_chantype != channel_type) {
206 changed |= BSS_CHANGED_HT;
207 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
208 sdata->ht_opmode_valid = enable_ht;
209 }
210
211 return changed;
212 }
213
214 /* frame sending functions */
215
216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
217 const u8 *bssid, u16 stype, u16 reason,
218 void *cookie, bool send_frame)
219 {
220 struct ieee80211_local *local = sdata->local;
221 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
222 struct sk_buff *skb;
223 struct ieee80211_mgmt *mgmt;
224
225 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
226 if (!skb) {
227 printk(KERN_DEBUG "%s: failed to allocate buffer for "
228 "deauth/disassoc frame\n", sdata->name);
229 return;
230 }
231 skb_reserve(skb, local->hw.extra_tx_headroom);
232
233 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
234 memset(mgmt, 0, 24);
235 memcpy(mgmt->da, bssid, ETH_ALEN);
236 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
237 memcpy(mgmt->bssid, bssid, ETH_ALEN);
238 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
239 skb_put(skb, 2);
240 /* u.deauth.reason_code == u.disassoc.reason_code */
241 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
242
243 if (stype == IEEE80211_STYPE_DEAUTH)
244 if (cookie)
245 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
248 else
249 if (cookie)
250 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
251 else
252 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
253 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
254 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
255
256 if (send_frame)
257 ieee80211_tx_skb(sdata, skb);
258 else
259 kfree_skb(skb);
260 }
261
262 void ieee80211_send_pspoll(struct ieee80211_local *local,
263 struct ieee80211_sub_if_data *sdata)
264 {
265 struct ieee80211_pspoll *pspoll;
266 struct sk_buff *skb;
267
268 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
269 if (!skb)
270 return;
271
272 pspoll = (struct ieee80211_pspoll *) skb->data;
273 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
274
275 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
276 ieee80211_tx_skb(sdata, skb);
277 }
278
279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
280 struct ieee80211_sub_if_data *sdata,
281 int powersave)
282 {
283 struct sk_buff *skb;
284 struct ieee80211_hdr_3addr *nullfunc;
285
286 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
287 if (!skb)
288 return;
289
290 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
291 if (powersave)
292 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
293
294 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
295 ieee80211_tx_skb(sdata, skb);
296 }
297
298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
299 struct ieee80211_sub_if_data *sdata)
300 {
301 struct sk_buff *skb;
302 struct ieee80211_hdr *nullfunc;
303 __le16 fc;
304
305 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
306 return;
307
308 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
309 if (!skb) {
310 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
311 "nullfunc frame\n", sdata->name);
312 return;
313 }
314 skb_reserve(skb, local->hw.extra_tx_headroom);
315
316 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
317 memset(nullfunc, 0, 30);
318 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
319 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
320 nullfunc->frame_control = fc;
321 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
322 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
323 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
324 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
325
326 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
327 ieee80211_tx_skb(sdata, skb);
328 }
329
330 /* spectrum management related things */
331 static void ieee80211_chswitch_work(struct work_struct *work)
332 {
333 struct ieee80211_sub_if_data *sdata =
334 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
336
337 if (!ieee80211_sdata_running(sdata))
338 return;
339
340 mutex_lock(&ifmgd->mtx);
341 if (!ifmgd->associated)
342 goto out;
343
344 sdata->local->oper_channel = sdata->local->csa_channel;
345 if (!sdata->local->ops->channel_switch) {
346 /* call "hw_config" only if doing sw channel switch */
347 ieee80211_hw_config(sdata->local,
348 IEEE80211_CONF_CHANGE_CHANNEL);
349 }
350
351 /* XXX: shouldn't really modify cfg80211-owned data! */
352 ifmgd->associated->channel = sdata->local->oper_channel;
353
354 ieee80211_wake_queues_by_reason(&sdata->local->hw,
355 IEEE80211_QUEUE_STOP_REASON_CSA);
356 out:
357 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
358 mutex_unlock(&ifmgd->mtx);
359 }
360
361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
362 {
363 struct ieee80211_sub_if_data *sdata;
364 struct ieee80211_if_managed *ifmgd;
365
366 sdata = vif_to_sdata(vif);
367 ifmgd = &sdata->u.mgd;
368
369 trace_api_chswitch_done(sdata, success);
370 if (!success) {
371 /*
372 * If the channel switch was not successful, stay
373 * around on the old channel. We currently lack
374 * good handling of this situation, possibly we
375 * should just drop the association.
376 */
377 sdata->local->csa_channel = sdata->local->oper_channel;
378 }
379
380 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
381 }
382 EXPORT_SYMBOL(ieee80211_chswitch_done);
383
384 static void ieee80211_chswitch_timer(unsigned long data)
385 {
386 struct ieee80211_sub_if_data *sdata =
387 (struct ieee80211_sub_if_data *) data;
388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
389
390 if (sdata->local->quiescing) {
391 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
392 return;
393 }
394
395 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
396 }
397
398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
399 struct ieee80211_channel_sw_ie *sw_elem,
400 struct ieee80211_bss *bss,
401 u64 timestamp)
402 {
403 struct cfg80211_bss *cbss =
404 container_of((void *)bss, struct cfg80211_bss, priv);
405 struct ieee80211_channel *new_ch;
406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
407 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
408
409 ASSERT_MGD_MTX(ifmgd);
410
411 if (!ifmgd->associated)
412 return;
413
414 if (sdata->local->scanning)
415 return;
416
417 /* Disregard subsequent beacons if we are already running a timer
418 processing a CSA */
419
420 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
421 return;
422
423 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
424 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
425 return;
426
427 sdata->local->csa_channel = new_ch;
428
429 if (sdata->local->ops->channel_switch) {
430 /* use driver's channel switch callback */
431 struct ieee80211_channel_switch ch_switch;
432 memset(&ch_switch, 0, sizeof(ch_switch));
433 ch_switch.timestamp = timestamp;
434 if (sw_elem->mode) {
435 ch_switch.block_tx = true;
436 ieee80211_stop_queues_by_reason(&sdata->local->hw,
437 IEEE80211_QUEUE_STOP_REASON_CSA);
438 }
439 ch_switch.channel = new_ch;
440 ch_switch.count = sw_elem->count;
441 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
442 drv_channel_switch(sdata->local, &ch_switch);
443 return;
444 }
445
446 /* channel switch handled in software */
447 if (sw_elem->count <= 1) {
448 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
449 } else {
450 if (sw_elem->mode)
451 ieee80211_stop_queues_by_reason(&sdata->local->hw,
452 IEEE80211_QUEUE_STOP_REASON_CSA);
453 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
454 mod_timer(&ifmgd->chswitch_timer,
455 jiffies +
456 msecs_to_jiffies(sw_elem->count *
457 cbss->beacon_interval));
458 }
459 }
460
461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
462 u16 capab_info, u8 *pwr_constr_elem,
463 u8 pwr_constr_elem_len)
464 {
465 struct ieee80211_conf *conf = &sdata->local->hw.conf;
466
467 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
468 return;
469
470 /* Power constraint IE length should be 1 octet */
471 if (pwr_constr_elem_len != 1)
472 return;
473
474 if ((*pwr_constr_elem <= conf->channel->max_power) &&
475 (*pwr_constr_elem != sdata->local->power_constr_level)) {
476 sdata->local->power_constr_level = *pwr_constr_elem;
477 ieee80211_hw_config(sdata->local, 0);
478 }
479 }
480
481 /* powersave */
482 static void ieee80211_enable_ps(struct ieee80211_local *local,
483 struct ieee80211_sub_if_data *sdata)
484 {
485 struct ieee80211_conf *conf = &local->hw.conf;
486
487 /*
488 * If we are scanning right now then the parameters will
489 * take effect when scan finishes.
490 */
491 if (local->scanning)
492 return;
493
494 if (conf->dynamic_ps_timeout > 0 &&
495 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
496 mod_timer(&local->dynamic_ps_timer, jiffies +
497 msecs_to_jiffies(conf->dynamic_ps_timeout));
498 } else {
499 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
500 ieee80211_send_nullfunc(local, sdata, 1);
501
502 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
503 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
504 return;
505
506 conf->flags |= IEEE80211_CONF_PS;
507 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
508 }
509 }
510
511 static void ieee80211_change_ps(struct ieee80211_local *local)
512 {
513 struct ieee80211_conf *conf = &local->hw.conf;
514
515 if (local->ps_sdata) {
516 ieee80211_enable_ps(local, local->ps_sdata);
517 } else if (conf->flags & IEEE80211_CONF_PS) {
518 conf->flags &= ~IEEE80211_CONF_PS;
519 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
520 del_timer_sync(&local->dynamic_ps_timer);
521 cancel_work_sync(&local->dynamic_ps_enable_work);
522 }
523 }
524
525 /* need to hold RTNL or interface lock */
526 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
527 {
528 struct ieee80211_sub_if_data *sdata, *found = NULL;
529 int count = 0;
530 int timeout;
531
532 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
533 local->ps_sdata = NULL;
534 return;
535 }
536
537 if (!list_empty(&local->work_list)) {
538 local->ps_sdata = NULL;
539 goto change;
540 }
541
542 list_for_each_entry(sdata, &local->interfaces, list) {
543 if (!ieee80211_sdata_running(sdata))
544 continue;
545 if (sdata->vif.type != NL80211_IFTYPE_STATION)
546 continue;
547 found = sdata;
548 count++;
549 }
550
551 if (count == 1 && found->u.mgd.powersave &&
552 found->u.mgd.associated &&
553 found->u.mgd.associated->beacon_ies &&
554 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
555 IEEE80211_STA_CONNECTION_POLL))) {
556 s32 beaconint_us;
557
558 if (latency < 0)
559 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
560
561 beaconint_us = ieee80211_tu_to_usec(
562 found->vif.bss_conf.beacon_int);
563
564 timeout = local->dynamic_ps_forced_timeout;
565 if (timeout < 0) {
566 /*
567 * Go to full PSM if the user configures a very low
568 * latency requirement.
569 * The 2 second value is there for compatibility until
570 * the PM_QOS_NETWORK_LATENCY is configured with real
571 * values.
572 */
573 if (latency > 1900000000 && latency != 2000000000)
574 timeout = 0;
575 else
576 timeout = 100;
577 }
578 local->hw.conf.dynamic_ps_timeout = timeout;
579
580 if (beaconint_us > latency) {
581 local->ps_sdata = NULL;
582 } else {
583 struct ieee80211_bss *bss;
584 int maxslp = 1;
585 u8 dtimper;
586
587 bss = (void *)found->u.mgd.associated->priv;
588 dtimper = bss->dtim_period;
589
590 /* If the TIM IE is invalid, pretend the value is 1 */
591 if (!dtimper)
592 dtimper = 1;
593 else if (dtimper > 1)
594 maxslp = min_t(int, dtimper,
595 latency / beaconint_us);
596
597 local->hw.conf.max_sleep_period = maxslp;
598 local->hw.conf.ps_dtim_period = dtimper;
599 local->ps_sdata = found;
600 }
601 } else {
602 local->ps_sdata = NULL;
603 }
604
605 change:
606 ieee80211_change_ps(local);
607 }
608
609 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
610 {
611 struct ieee80211_local *local =
612 container_of(work, struct ieee80211_local,
613 dynamic_ps_disable_work);
614
615 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
616 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
617 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
618 }
619
620 ieee80211_wake_queues_by_reason(&local->hw,
621 IEEE80211_QUEUE_STOP_REASON_PS);
622 }
623
624 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
625 {
626 struct ieee80211_local *local =
627 container_of(work, struct ieee80211_local,
628 dynamic_ps_enable_work);
629 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
630 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
631
632 /* can only happen when PS was just disabled anyway */
633 if (!sdata)
634 return;
635
636 if (local->hw.conf.flags & IEEE80211_CONF_PS)
637 return;
638
639 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
640 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
641 ieee80211_send_nullfunc(local, sdata, 1);
642
643 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
644 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
645 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
646 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
647 local->hw.conf.flags |= IEEE80211_CONF_PS;
648 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
649 }
650 }
651
652 void ieee80211_dynamic_ps_timer(unsigned long data)
653 {
654 struct ieee80211_local *local = (void *) data;
655
656 if (local->quiescing || local->suspended)
657 return;
658
659 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
660 }
661
662 /* MLME */
663 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
664 struct ieee80211_if_managed *ifmgd,
665 u8 *wmm_param, size_t wmm_param_len)
666 {
667 struct ieee80211_tx_queue_params params;
668 size_t left;
669 int count;
670 u8 *pos, uapsd_queues = 0;
671
672 if (!local->ops->conf_tx)
673 return;
674
675 if (local->hw.queues < 4)
676 return;
677
678 if (!wmm_param)
679 return;
680
681 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
682 return;
683
684 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
685 uapsd_queues = local->uapsd_queues;
686
687 count = wmm_param[6] & 0x0f;
688 if (count == ifmgd->wmm_last_param_set)
689 return;
690 ifmgd->wmm_last_param_set = count;
691
692 pos = wmm_param + 8;
693 left = wmm_param_len - 8;
694
695 memset(&params, 0, sizeof(params));
696
697 local->wmm_acm = 0;
698 for (; left >= 4; left -= 4, pos += 4) {
699 int aci = (pos[0] >> 5) & 0x03;
700 int acm = (pos[0] >> 4) & 0x01;
701 bool uapsd = false;
702 int queue;
703
704 switch (aci) {
705 case 1: /* AC_BK */
706 queue = 3;
707 if (acm)
708 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
709 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
710 uapsd = true;
711 break;
712 case 2: /* AC_VI */
713 queue = 1;
714 if (acm)
715 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
716 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
717 uapsd = true;
718 break;
719 case 3: /* AC_VO */
720 queue = 0;
721 if (acm)
722 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
723 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
724 uapsd = true;
725 break;
726 case 0: /* AC_BE */
727 default:
728 queue = 2;
729 if (acm)
730 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
731 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
732 uapsd = true;
733 break;
734 }
735
736 params.aifs = pos[0] & 0x0f;
737 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
738 params.cw_min = ecw2cw(pos[1] & 0x0f);
739 params.txop = get_unaligned_le16(pos + 2);
740 params.uapsd = uapsd;
741
742 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
743 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
744 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
745 wiphy_name(local->hw.wiphy), queue, aci, acm,
746 params.aifs, params.cw_min, params.cw_max, params.txop,
747 params.uapsd);
748 #endif
749 if (drv_conf_tx(local, queue, &params))
750 printk(KERN_DEBUG "%s: failed to set TX queue "
751 "parameters for queue %d\n",
752 wiphy_name(local->hw.wiphy), queue);
753 }
754
755 /* enable WMM or activate new settings */
756 local->hw.conf.flags |= IEEE80211_CONF_QOS;
757 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
758 }
759
760 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
761 u16 capab, bool erp_valid, u8 erp)
762 {
763 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
764 u32 changed = 0;
765 bool use_protection;
766 bool use_short_preamble;
767 bool use_short_slot;
768
769 if (erp_valid) {
770 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
771 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
772 } else {
773 use_protection = false;
774 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
775 }
776
777 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
778 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
779 use_short_slot = true;
780
781 if (use_protection != bss_conf->use_cts_prot) {
782 bss_conf->use_cts_prot = use_protection;
783 changed |= BSS_CHANGED_ERP_CTS_PROT;
784 }
785
786 if (use_short_preamble != bss_conf->use_short_preamble) {
787 bss_conf->use_short_preamble = use_short_preamble;
788 changed |= BSS_CHANGED_ERP_PREAMBLE;
789 }
790
791 if (use_short_slot != bss_conf->use_short_slot) {
792 bss_conf->use_short_slot = use_short_slot;
793 changed |= BSS_CHANGED_ERP_SLOT;
794 }
795
796 return changed;
797 }
798
799 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
800 struct cfg80211_bss *cbss,
801 u32 bss_info_changed)
802 {
803 struct ieee80211_bss *bss = (void *)cbss->priv;
804 struct ieee80211_local *local = sdata->local;
805 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
806
807 bss_info_changed |= BSS_CHANGED_ASSOC;
808 /* set timing information */
809 bss_conf->beacon_int = cbss->beacon_interval;
810 bss_conf->timestamp = cbss->tsf;
811
812 bss_info_changed |= BSS_CHANGED_BEACON_INT;
813 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
814 cbss->capability, bss->has_erp_value, bss->erp_value);
815
816 sdata->u.mgd.associated = cbss;
817 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
818
819 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
820
821 /* just to be sure */
822 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
823 IEEE80211_STA_BEACON_POLL);
824
825 /*
826 * Always handle WMM once after association regardless
827 * of the first value the AP uses. Setting -1 here has
828 * that effect because the AP values is an unsigned
829 * 4-bit value.
830 */
831 sdata->u.mgd.wmm_last_param_set = -1;
832
833 ieee80211_led_assoc(local, 1);
834
835 bss_conf->assoc = 1;
836 /*
837 * For now just always ask the driver to update the basic rateset
838 * when we have associated, we aren't checking whether it actually
839 * changed or not.
840 */
841 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
842
843 /* And the BSSID changed - we're associated now */
844 bss_info_changed |= BSS_CHANGED_BSSID;
845
846 /* Tell the driver to monitor connection quality (if supported) */
847 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
848 bss_conf->cqm_rssi_thold)
849 bss_info_changed |= BSS_CHANGED_CQM;
850
851 /* Enable ARP filtering */
852 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
853 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
854 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
855 }
856
857 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
858
859 mutex_lock(&local->iflist_mtx);
860 ieee80211_recalc_ps(local, -1);
861 ieee80211_recalc_smps(local, sdata);
862 mutex_unlock(&local->iflist_mtx);
863
864 netif_tx_start_all_queues(sdata->dev);
865 netif_carrier_on(sdata->dev);
866 }
867
868 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
869 bool remove_sta)
870 {
871 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
872 struct ieee80211_local *local = sdata->local;
873 struct sta_info *sta;
874 u32 changed = 0, config_changed = 0;
875 u8 bssid[ETH_ALEN];
876
877 ASSERT_MGD_MTX(ifmgd);
878
879 if (WARN_ON(!ifmgd->associated))
880 return;
881
882 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
883
884 ifmgd->associated = NULL;
885 memset(ifmgd->bssid, 0, ETH_ALEN);
886
887 /*
888 * we need to commit the associated = NULL change because the
889 * scan code uses that to determine whether this iface should
890 * go to/wake up from powersave or not -- and could otherwise
891 * wake the queues erroneously.
892 */
893 smp_mb();
894
895 /*
896 * Thus, we can only afterwards stop the queues -- to account
897 * for the case where another CPU is finishing a scan at this
898 * time -- we don't want the scan code to enable queues.
899 */
900
901 netif_tx_stop_all_queues(sdata->dev);
902 netif_carrier_off(sdata->dev);
903
904 mutex_lock(&local->sta_mtx);
905 sta = sta_info_get(sdata, bssid);
906 if (sta) {
907 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
908 ieee80211_sta_tear_down_BA_sessions(sta);
909 }
910 mutex_unlock(&local->sta_mtx);
911
912 changed |= ieee80211_reset_erp_info(sdata);
913
914 ieee80211_led_assoc(local, 0);
915 changed |= BSS_CHANGED_ASSOC;
916 sdata->vif.bss_conf.assoc = false;
917
918 ieee80211_set_wmm_default(sdata);
919
920 /* channel(_type) changes are handled by ieee80211_hw_config */
921 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
922
923 /* on the next assoc, re-program HT parameters */
924 sdata->ht_opmode_valid = false;
925
926 local->power_constr_level = 0;
927
928 del_timer_sync(&local->dynamic_ps_timer);
929 cancel_work_sync(&local->dynamic_ps_enable_work);
930
931 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
932 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
933 config_changed |= IEEE80211_CONF_CHANGE_PS;
934 }
935
936 ieee80211_hw_config(local, config_changed);
937
938 /* Disable ARP filtering */
939 if (sdata->vif.bss_conf.arp_filter_enabled) {
940 sdata->vif.bss_conf.arp_filter_enabled = false;
941 changed |= BSS_CHANGED_ARP_FILTER;
942 }
943
944 /* The BSSID (not really interesting) and HT changed */
945 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
946 ieee80211_bss_info_change_notify(sdata, changed);
947
948 if (remove_sta)
949 sta_info_destroy_addr(sdata, bssid);
950 }
951
952 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
953 struct ieee80211_hdr *hdr)
954 {
955 /*
956 * We can postpone the mgd.timer whenever receiving unicast frames
957 * from AP because we know that the connection is working both ways
958 * at that time. But multicast frames (and hence also beacons) must
959 * be ignored here, because we need to trigger the timer during
960 * data idle periods for sending the periodic probe request to the
961 * AP we're connected to.
962 */
963 if (is_multicast_ether_addr(hdr->addr1))
964 return;
965
966 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
967 return;
968
969 mod_timer(&sdata->u.mgd.conn_mon_timer,
970 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
971 }
972
973 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
974 {
975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
976 const u8 *ssid;
977
978 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
979 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
980 ssid + 2, ssid[1], NULL, 0);
981
982 ifmgd->probe_send_count++;
983 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
984 run_again(ifmgd, ifmgd->probe_timeout);
985 }
986
987 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
988 bool beacon)
989 {
990 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
991 bool already = false;
992
993 if (!ieee80211_sdata_running(sdata))
994 return;
995
996 if (sdata->local->scanning)
997 return;
998
999 if (sdata->local->tmp_channel)
1000 return;
1001
1002 mutex_lock(&ifmgd->mtx);
1003
1004 if (!ifmgd->associated)
1005 goto out;
1006
1007 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1008 if (beacon && net_ratelimit())
1009 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1010 "- sending probe request\n", sdata->name);
1011 #endif
1012
1013 /*
1014 * The driver/our work has already reported this event or the
1015 * connection monitoring has kicked in and we have already sent
1016 * a probe request. Or maybe the AP died and the driver keeps
1017 * reporting until we disassociate...
1018 *
1019 * In either case we have to ignore the current call to this
1020 * function (except for setting the correct probe reason bit)
1021 * because otherwise we would reset the timer every time and
1022 * never check whether we received a probe response!
1023 */
1024 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1025 IEEE80211_STA_CONNECTION_POLL))
1026 already = true;
1027
1028 if (beacon)
1029 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1030 else
1031 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1032
1033 if (already)
1034 goto out;
1035
1036 mutex_lock(&sdata->local->iflist_mtx);
1037 ieee80211_recalc_ps(sdata->local, -1);
1038 mutex_unlock(&sdata->local->iflist_mtx);
1039
1040 ifmgd->probe_send_count = 0;
1041 ieee80211_mgd_probe_ap_send(sdata);
1042 out:
1043 mutex_unlock(&ifmgd->mtx);
1044 }
1045
1046 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1047 {
1048 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049 struct ieee80211_local *local = sdata->local;
1050 u8 bssid[ETH_ALEN];
1051
1052 mutex_lock(&ifmgd->mtx);
1053 if (!ifmgd->associated) {
1054 mutex_unlock(&ifmgd->mtx);
1055 return;
1056 }
1057
1058 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1059
1060 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1061
1062 ieee80211_set_disassoc(sdata, true);
1063 ieee80211_recalc_idle(local);
1064 mutex_unlock(&ifmgd->mtx);
1065 /*
1066 * must be outside lock due to cfg80211,
1067 * but that's not a problem.
1068 */
1069 ieee80211_send_deauth_disassoc(sdata, bssid,
1070 IEEE80211_STYPE_DEAUTH,
1071 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1072 NULL, true);
1073 }
1074
1075 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1076 {
1077 struct ieee80211_sub_if_data *sdata =
1078 container_of(work, struct ieee80211_sub_if_data,
1079 u.mgd.beacon_connection_loss_work);
1080
1081 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1082 __ieee80211_connection_loss(sdata);
1083 else
1084 ieee80211_mgd_probe_ap(sdata, true);
1085 }
1086
1087 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1088 {
1089 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1090 struct ieee80211_hw *hw = &sdata->local->hw;
1091
1092 trace_api_beacon_loss(sdata);
1093
1094 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1095 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1096 }
1097 EXPORT_SYMBOL(ieee80211_beacon_loss);
1098
1099 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1100 {
1101 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102 struct ieee80211_hw *hw = &sdata->local->hw;
1103
1104 trace_api_connection_loss(sdata);
1105
1106 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1107 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1108 }
1109 EXPORT_SYMBOL(ieee80211_connection_loss);
1110
1111
1112 static enum rx_mgmt_action __must_check
1113 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1114 struct ieee80211_mgmt *mgmt, size_t len)
1115 {
1116 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117 const u8 *bssid = NULL;
1118 u16 reason_code;
1119
1120 if (len < 24 + 2)
1121 return RX_MGMT_NONE;
1122
1123 ASSERT_MGD_MTX(ifmgd);
1124
1125 bssid = ifmgd->associated->bssid;
1126
1127 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1128
1129 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1130 sdata->name, bssid, reason_code);
1131
1132 ieee80211_set_disassoc(sdata, true);
1133 ieee80211_recalc_idle(sdata->local);
1134
1135 return RX_MGMT_CFG80211_DEAUTH;
1136 }
1137
1138
1139 static enum rx_mgmt_action __must_check
1140 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1141 struct ieee80211_mgmt *mgmt, size_t len)
1142 {
1143 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1144 u16 reason_code;
1145
1146 if (len < 24 + 2)
1147 return RX_MGMT_NONE;
1148
1149 ASSERT_MGD_MTX(ifmgd);
1150
1151 if (WARN_ON(!ifmgd->associated))
1152 return RX_MGMT_NONE;
1153
1154 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1155 return RX_MGMT_NONE;
1156
1157 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1158
1159 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1160 sdata->name, mgmt->sa, reason_code);
1161
1162 ieee80211_set_disassoc(sdata, true);
1163 ieee80211_recalc_idle(sdata->local);
1164 return RX_MGMT_CFG80211_DISASSOC;
1165 }
1166
1167
1168 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1169 struct ieee80211_mgmt *mgmt, size_t len)
1170 {
1171 struct ieee80211_sub_if_data *sdata = wk->sdata;
1172 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1173 struct ieee80211_local *local = sdata->local;
1174 struct ieee80211_supported_band *sband;
1175 struct sta_info *sta;
1176 struct cfg80211_bss *cbss = wk->assoc.bss;
1177 u8 *pos;
1178 u32 rates, basic_rates;
1179 u16 capab_info, aid;
1180 struct ieee802_11_elems elems;
1181 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1182 u32 changed = 0;
1183 int i, j, err;
1184 bool have_higher_than_11mbit = false;
1185 u16 ap_ht_cap_flags;
1186
1187 /* AssocResp and ReassocResp have identical structure */
1188
1189 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1190 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1191
1192 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1193 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1194 "set\n", sdata->name, aid);
1195 aid &= ~(BIT(15) | BIT(14));
1196
1197 pos = mgmt->u.assoc_resp.variable;
1198 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1199
1200 if (!elems.supp_rates) {
1201 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1202 sdata->name);
1203 return false;
1204 }
1205
1206 ifmgd->aid = aid;
1207
1208 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1209 if (!sta) {
1210 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1211 " the AP\n", sdata->name);
1212 return false;
1213 }
1214
1215 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1216 WLAN_STA_ASSOC_AP);
1217 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1218 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1219
1220 rates = 0;
1221 basic_rates = 0;
1222 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1223
1224 for (i = 0; i < elems.supp_rates_len; i++) {
1225 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1226 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1227
1228 if (rate > 110)
1229 have_higher_than_11mbit = true;
1230
1231 for (j = 0; j < sband->n_bitrates; j++) {
1232 if (sband->bitrates[j].bitrate == rate) {
1233 rates |= BIT(j);
1234 if (is_basic)
1235 basic_rates |= BIT(j);
1236 break;
1237 }
1238 }
1239 }
1240
1241 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1242 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1243 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1244
1245 if (rate > 110)
1246 have_higher_than_11mbit = true;
1247
1248 for (j = 0; j < sband->n_bitrates; j++) {
1249 if (sband->bitrates[j].bitrate == rate) {
1250 rates |= BIT(j);
1251 if (is_basic)
1252 basic_rates |= BIT(j);
1253 break;
1254 }
1255 }
1256 }
1257
1258 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1259 sdata->vif.bss_conf.basic_rates = basic_rates;
1260
1261 /* cf. IEEE 802.11 9.2.12 */
1262 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1263 have_higher_than_11mbit)
1264 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1265 else
1266 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1267
1268 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1269 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1270 elems.ht_cap_elem, &sta->sta.ht_cap);
1271
1272 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1273
1274 rate_control_rate_init(sta);
1275
1276 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1277 set_sta_flags(sta, WLAN_STA_MFP);
1278
1279 if (elems.wmm_param)
1280 set_sta_flags(sta, WLAN_STA_WME);
1281
1282 err = sta_info_insert(sta);
1283 sta = NULL;
1284 if (err) {
1285 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1286 " the AP (error %d)\n", sdata->name, err);
1287 return false;
1288 }
1289
1290 if (elems.wmm_param)
1291 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1292 elems.wmm_param_len);
1293 else
1294 ieee80211_set_wmm_default(sdata);
1295
1296 local->oper_channel = wk->chan;
1297
1298 if (elems.ht_info_elem && elems.wmm_param &&
1299 (sdata->local->hw.queues >= 4) &&
1300 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1301 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1302 cbss->bssid, ap_ht_cap_flags);
1303
1304 /* set AID and assoc capability,
1305 * ieee80211_set_associated() will tell the driver */
1306 bss_conf->aid = aid;
1307 bss_conf->assoc_capability = capab_info;
1308 ieee80211_set_associated(sdata, cbss, changed);
1309
1310 /*
1311 * If we're using 4-addr mode, let the AP know that we're
1312 * doing so, so that it can create the STA VLAN on its side
1313 */
1314 if (ifmgd->use_4addr)
1315 ieee80211_send_4addr_nullfunc(local, sdata);
1316
1317 /*
1318 * Start timer to probe the connection to the AP now.
1319 * Also start the timer that will detect beacon loss.
1320 */
1321 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1322 mod_beacon_timer(sdata);
1323
1324 return true;
1325 }
1326
1327
1328 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1329 struct ieee80211_mgmt *mgmt,
1330 size_t len,
1331 struct ieee80211_rx_status *rx_status,
1332 struct ieee802_11_elems *elems,
1333 bool beacon)
1334 {
1335 struct ieee80211_local *local = sdata->local;
1336 int freq;
1337 struct ieee80211_bss *bss;
1338 struct ieee80211_channel *channel;
1339 bool need_ps = false;
1340
1341 if (sdata->u.mgd.associated) {
1342 bss = (void *)sdata->u.mgd.associated->priv;
1343 /* not previously set so we may need to recalc */
1344 need_ps = !bss->dtim_period;
1345 }
1346
1347 if (elems->ds_params && elems->ds_params_len == 1)
1348 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1349 else
1350 freq = rx_status->freq;
1351
1352 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1353
1354 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1355 return;
1356
1357 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1358 channel, beacon);
1359 if (bss)
1360 ieee80211_rx_bss_put(local, bss);
1361
1362 if (!sdata->u.mgd.associated)
1363 return;
1364
1365 if (need_ps) {
1366 mutex_lock(&local->iflist_mtx);
1367 ieee80211_recalc_ps(local, -1);
1368 mutex_unlock(&local->iflist_mtx);
1369 }
1370
1371 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1372 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1373 ETH_ALEN) == 0)) {
1374 struct ieee80211_channel_sw_ie *sw_elem =
1375 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1376 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1377 bss, rx_status->mactime);
1378 }
1379 }
1380
1381
1382 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1383 struct sk_buff *skb)
1384 {
1385 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1386 struct ieee80211_if_managed *ifmgd;
1387 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1388 size_t baselen, len = skb->len;
1389 struct ieee802_11_elems elems;
1390
1391 ifmgd = &sdata->u.mgd;
1392
1393 ASSERT_MGD_MTX(ifmgd);
1394
1395 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1396 return; /* ignore ProbeResp to foreign address */
1397
1398 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1399 if (baselen > len)
1400 return;
1401
1402 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1403 &elems);
1404
1405 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1406
1407 if (ifmgd->associated &&
1408 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1409 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1410 IEEE80211_STA_CONNECTION_POLL)) {
1411 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1412 IEEE80211_STA_BEACON_POLL);
1413 mutex_lock(&sdata->local->iflist_mtx);
1414 ieee80211_recalc_ps(sdata->local, -1);
1415 mutex_unlock(&sdata->local->iflist_mtx);
1416
1417 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1418 return;
1419
1420 /*
1421 * We've received a probe response, but are not sure whether
1422 * we have or will be receiving any beacons or data, so let's
1423 * schedule the timers again, just in case.
1424 */
1425 mod_beacon_timer(sdata);
1426
1427 mod_timer(&ifmgd->conn_mon_timer,
1428 round_jiffies_up(jiffies +
1429 IEEE80211_CONNECTION_IDLE_TIME));
1430 }
1431 }
1432
1433 /*
1434 * This is the canonical list of information elements we care about,
1435 * the filter code also gives us all changes to the Microsoft OUI
1436 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1437 *
1438 * We implement beacon filtering in software since that means we can
1439 * avoid processing the frame here and in cfg80211, and userspace
1440 * will not be able to tell whether the hardware supports it or not.
1441 *
1442 * XXX: This list needs to be dynamic -- userspace needs to be able to
1443 * add items it requires. It also needs to be able to tell us to
1444 * look out for other vendor IEs.
1445 */
1446 static const u64 care_about_ies =
1447 (1ULL << WLAN_EID_COUNTRY) |
1448 (1ULL << WLAN_EID_ERP_INFO) |
1449 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1450 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1451 (1ULL << WLAN_EID_HT_CAPABILITY) |
1452 (1ULL << WLAN_EID_HT_INFORMATION);
1453
1454 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1455 struct ieee80211_mgmt *mgmt,
1456 size_t len,
1457 struct ieee80211_rx_status *rx_status)
1458 {
1459 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1460 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1461 size_t baselen;
1462 struct ieee802_11_elems elems;
1463 struct ieee80211_local *local = sdata->local;
1464 u32 changed = 0;
1465 bool erp_valid, directed_tim = false;
1466 u8 erp_value = 0;
1467 u32 ncrc;
1468 u8 *bssid;
1469
1470 ASSERT_MGD_MTX(ifmgd);
1471
1472 /* Process beacon from the current BSS */
1473 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1474 if (baselen > len)
1475 return;
1476
1477 if (rx_status->freq != local->hw.conf.channel->center_freq)
1478 return;
1479
1480 /*
1481 * We might have received a number of frames, among them a
1482 * disassoc frame and a beacon...
1483 */
1484 if (!ifmgd->associated)
1485 return;
1486
1487 bssid = ifmgd->associated->bssid;
1488
1489 /*
1490 * And in theory even frames from a different AP we were just
1491 * associated to a split-second ago!
1492 */
1493 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1494 return;
1495
1496 /* Track average RSSI from the Beacon frames of the current AP */
1497 ifmgd->last_beacon_signal = rx_status->signal;
1498 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1499 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1500 ifmgd->ave_beacon_signal = rx_status->signal;
1501 ifmgd->last_cqm_event_signal = 0;
1502 } else {
1503 ifmgd->ave_beacon_signal =
1504 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1505 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1506 ifmgd->ave_beacon_signal) / 16;
1507 }
1508 if (bss_conf->cqm_rssi_thold &&
1509 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1510 int sig = ifmgd->ave_beacon_signal / 16;
1511 int last_event = ifmgd->last_cqm_event_signal;
1512 int thold = bss_conf->cqm_rssi_thold;
1513 int hyst = bss_conf->cqm_rssi_hyst;
1514 if (sig < thold &&
1515 (last_event == 0 || sig < last_event - hyst)) {
1516 ifmgd->last_cqm_event_signal = sig;
1517 ieee80211_cqm_rssi_notify(
1518 &sdata->vif,
1519 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1520 GFP_KERNEL);
1521 } else if (sig > thold &&
1522 (last_event == 0 || sig > last_event + hyst)) {
1523 ifmgd->last_cqm_event_signal = sig;
1524 ieee80211_cqm_rssi_notify(
1525 &sdata->vif,
1526 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1527 GFP_KERNEL);
1528 }
1529 }
1530
1531 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1532 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1533 if (net_ratelimit()) {
1534 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1535 "to a received beacon\n", sdata->name);
1536 }
1537 #endif
1538 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1539 mutex_lock(&local->iflist_mtx);
1540 ieee80211_recalc_ps(local, -1);
1541 mutex_unlock(&local->iflist_mtx);
1542 }
1543
1544 /*
1545 * Push the beacon loss detection into the future since
1546 * we are processing a beacon from the AP just now.
1547 */
1548 mod_beacon_timer(sdata);
1549
1550 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1551 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1552 len - baselen, &elems,
1553 care_about_ies, ncrc);
1554
1555 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1556 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1557 ifmgd->aid);
1558
1559 if (ncrc != ifmgd->beacon_crc) {
1560 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1561 true);
1562
1563 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1564 elems.wmm_param_len);
1565 }
1566
1567 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1568 if (directed_tim) {
1569 if (local->hw.conf.dynamic_ps_timeout > 0) {
1570 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1571 ieee80211_hw_config(local,
1572 IEEE80211_CONF_CHANGE_PS);
1573 ieee80211_send_nullfunc(local, sdata, 0);
1574 } else {
1575 local->pspolling = true;
1576
1577 /*
1578 * Here is assumed that the driver will be
1579 * able to send ps-poll frame and receive a
1580 * response even though power save mode is
1581 * enabled, but some drivers might require
1582 * to disable power save here. This needs
1583 * to be investigated.
1584 */
1585 ieee80211_send_pspoll(local, sdata);
1586 }
1587 }
1588 }
1589
1590 if (ncrc == ifmgd->beacon_crc)
1591 return;
1592 ifmgd->beacon_crc = ncrc;
1593
1594 if (elems.erp_info && elems.erp_info_len >= 1) {
1595 erp_valid = true;
1596 erp_value = elems.erp_info[0];
1597 } else {
1598 erp_valid = false;
1599 }
1600 changed |= ieee80211_handle_bss_capability(sdata,
1601 le16_to_cpu(mgmt->u.beacon.capab_info),
1602 erp_valid, erp_value);
1603
1604
1605 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1606 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1607 struct sta_info *sta;
1608 struct ieee80211_supported_band *sband;
1609 u16 ap_ht_cap_flags;
1610
1611 rcu_read_lock();
1612
1613 sta = sta_info_get(sdata, bssid);
1614 if (WARN_ON(!sta)) {
1615 rcu_read_unlock();
1616 return;
1617 }
1618
1619 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1620
1621 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1622 elems.ht_cap_elem, &sta->sta.ht_cap);
1623
1624 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1625
1626 rcu_read_unlock();
1627
1628 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1629 bssid, ap_ht_cap_flags);
1630 }
1631
1632 /* Note: country IE parsing is done for us by cfg80211 */
1633 if (elems.country_elem) {
1634 /* TODO: IBSS also needs this */
1635 if (elems.pwr_constr_elem)
1636 ieee80211_handle_pwr_constr(sdata,
1637 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1638 elems.pwr_constr_elem,
1639 elems.pwr_constr_elem_len);
1640 }
1641
1642 ieee80211_bss_info_change_notify(sdata, changed);
1643 }
1644
1645 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1646 struct sk_buff *skb)
1647 {
1648 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1649 struct ieee80211_rx_status *rx_status;
1650 struct ieee80211_mgmt *mgmt;
1651 enum rx_mgmt_action rma = RX_MGMT_NONE;
1652 u16 fc;
1653
1654 rx_status = (struct ieee80211_rx_status *) skb->cb;
1655 mgmt = (struct ieee80211_mgmt *) skb->data;
1656 fc = le16_to_cpu(mgmt->frame_control);
1657
1658 mutex_lock(&ifmgd->mtx);
1659
1660 if (ifmgd->associated &&
1661 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1662 switch (fc & IEEE80211_FCTL_STYPE) {
1663 case IEEE80211_STYPE_BEACON:
1664 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1665 rx_status);
1666 break;
1667 case IEEE80211_STYPE_PROBE_RESP:
1668 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1669 break;
1670 case IEEE80211_STYPE_DEAUTH:
1671 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1672 break;
1673 case IEEE80211_STYPE_DISASSOC:
1674 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1675 break;
1676 case IEEE80211_STYPE_ACTION:
1677 switch (mgmt->u.action.category) {
1678 case WLAN_CATEGORY_SPECTRUM_MGMT:
1679 ieee80211_sta_process_chanswitch(sdata,
1680 &mgmt->u.action.u.chan_switch.sw_elem,
1681 (void *)ifmgd->associated->priv,
1682 rx_status->mactime);
1683 break;
1684 }
1685 }
1686 mutex_unlock(&ifmgd->mtx);
1687
1688 switch (rma) {
1689 case RX_MGMT_NONE:
1690 /* no action */
1691 break;
1692 case RX_MGMT_CFG80211_DEAUTH:
1693 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1694 break;
1695 case RX_MGMT_CFG80211_DISASSOC:
1696 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1697 break;
1698 default:
1699 WARN(1, "unexpected: %d", rma);
1700 }
1701 return;
1702 }
1703
1704 mutex_unlock(&ifmgd->mtx);
1705
1706 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1707 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1708 struct ieee80211_local *local = sdata->local;
1709 struct ieee80211_work *wk;
1710
1711 mutex_lock(&local->work_mtx);
1712 list_for_each_entry(wk, &local->work_list, list) {
1713 if (wk->sdata != sdata)
1714 continue;
1715
1716 if (wk->type != IEEE80211_WORK_ASSOC)
1717 continue;
1718
1719 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1720 continue;
1721 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1722 continue;
1723
1724 /*
1725 * Printing the message only here means we can't
1726 * spuriously print it, but it also means that it
1727 * won't be printed when the frame comes in before
1728 * we even tried to associate or in similar cases.
1729 *
1730 * Ultimately, I suspect cfg80211 should print the
1731 * messages instead.
1732 */
1733 printk(KERN_DEBUG
1734 "%s: deauthenticated from %pM (Reason: %u)\n",
1735 sdata->name, mgmt->bssid,
1736 le16_to_cpu(mgmt->u.deauth.reason_code));
1737
1738 list_del_rcu(&wk->list);
1739 free_work(wk);
1740 break;
1741 }
1742 mutex_unlock(&local->work_mtx);
1743
1744 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1745 }
1746 }
1747
1748 static void ieee80211_sta_timer(unsigned long data)
1749 {
1750 struct ieee80211_sub_if_data *sdata =
1751 (struct ieee80211_sub_if_data *) data;
1752 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1753 struct ieee80211_local *local = sdata->local;
1754
1755 if (local->quiescing) {
1756 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1757 return;
1758 }
1759
1760 ieee80211_queue_work(&local->hw, &sdata->work);
1761 }
1762
1763 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1764 {
1765 struct ieee80211_local *local = sdata->local;
1766 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1767
1768 /* then process the rest of the work */
1769 mutex_lock(&ifmgd->mtx);
1770
1771 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1772 IEEE80211_STA_CONNECTION_POLL) &&
1773 ifmgd->associated) {
1774 u8 bssid[ETH_ALEN];
1775
1776 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1777 if (time_is_after_jiffies(ifmgd->probe_timeout))
1778 run_again(ifmgd, ifmgd->probe_timeout);
1779
1780 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1781 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1782 printk(KERN_DEBUG "No probe response from AP %pM"
1783 " after %dms, try %d\n", bssid,
1784 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1785 ifmgd->probe_send_count);
1786 #endif
1787 ieee80211_mgd_probe_ap_send(sdata);
1788 } else {
1789 /*
1790 * We actually lost the connection ... or did we?
1791 * Let's make sure!
1792 */
1793 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1794 IEEE80211_STA_BEACON_POLL);
1795 printk(KERN_DEBUG "No probe response from AP %pM"
1796 " after %dms, disconnecting.\n",
1797 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1798 ieee80211_set_disassoc(sdata, true);
1799 ieee80211_recalc_idle(local);
1800 mutex_unlock(&ifmgd->mtx);
1801 /*
1802 * must be outside lock due to cfg80211,
1803 * but that's not a problem.
1804 */
1805 ieee80211_send_deauth_disassoc(sdata, bssid,
1806 IEEE80211_STYPE_DEAUTH,
1807 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1808 NULL, true);
1809 mutex_lock(&ifmgd->mtx);
1810 }
1811 }
1812
1813 mutex_unlock(&ifmgd->mtx);
1814 }
1815
1816 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1817 {
1818 struct ieee80211_sub_if_data *sdata =
1819 (struct ieee80211_sub_if_data *) data;
1820 struct ieee80211_local *local = sdata->local;
1821
1822 if (local->quiescing)
1823 return;
1824
1825 ieee80211_queue_work(&sdata->local->hw,
1826 &sdata->u.mgd.beacon_connection_loss_work);
1827 }
1828
1829 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1830 {
1831 struct ieee80211_sub_if_data *sdata =
1832 (struct ieee80211_sub_if_data *) data;
1833 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1834 struct ieee80211_local *local = sdata->local;
1835
1836 if (local->quiescing)
1837 return;
1838
1839 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1840 }
1841
1842 static void ieee80211_sta_monitor_work(struct work_struct *work)
1843 {
1844 struct ieee80211_sub_if_data *sdata =
1845 container_of(work, struct ieee80211_sub_if_data,
1846 u.mgd.monitor_work);
1847
1848 ieee80211_mgd_probe_ap(sdata, false);
1849 }
1850
1851 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1852 {
1853 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1854 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1855 IEEE80211_STA_CONNECTION_POLL);
1856
1857 /* let's probe the connection once */
1858 ieee80211_queue_work(&sdata->local->hw,
1859 &sdata->u.mgd.monitor_work);
1860 /* and do all the other regular work too */
1861 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1862 }
1863 }
1864
1865 #ifdef CONFIG_PM
1866 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1867 {
1868 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1869
1870 /*
1871 * we need to use atomic bitops for the running bits
1872 * only because both timers might fire at the same
1873 * time -- the code here is properly synchronised.
1874 */
1875
1876 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1877 if (del_timer_sync(&ifmgd->timer))
1878 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1879
1880 cancel_work_sync(&ifmgd->chswitch_work);
1881 if (del_timer_sync(&ifmgd->chswitch_timer))
1882 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1883
1884 cancel_work_sync(&ifmgd->monitor_work);
1885 /* these will just be re-established on connection */
1886 del_timer_sync(&ifmgd->conn_mon_timer);
1887 del_timer_sync(&ifmgd->bcn_mon_timer);
1888 }
1889
1890 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1891 {
1892 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893
1894 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1895 add_timer(&ifmgd->timer);
1896 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1897 add_timer(&ifmgd->chswitch_timer);
1898 }
1899 #endif
1900
1901 /* interface setup */
1902 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1903 {
1904 struct ieee80211_if_managed *ifmgd;
1905
1906 ifmgd = &sdata->u.mgd;
1907 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1908 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1909 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1910 ieee80211_beacon_connection_loss_work);
1911 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1912 (unsigned long) sdata);
1913 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1914 (unsigned long) sdata);
1915 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1916 (unsigned long) sdata);
1917 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1918 (unsigned long) sdata);
1919
1920 ifmgd->flags = 0;
1921
1922 mutex_init(&ifmgd->mtx);
1923
1924 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1925 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1926 else
1927 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1928 }
1929
1930 /* scan finished notification */
1931 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1932 {
1933 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1934
1935 /* Restart STA timers */
1936 rcu_read_lock();
1937 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1938 ieee80211_restart_sta_timer(sdata);
1939 rcu_read_unlock();
1940 }
1941
1942 int ieee80211_max_network_latency(struct notifier_block *nb,
1943 unsigned long data, void *dummy)
1944 {
1945 s32 latency_usec = (s32) data;
1946 struct ieee80211_local *local =
1947 container_of(nb, struct ieee80211_local,
1948 network_latency_notifier);
1949
1950 mutex_lock(&local->iflist_mtx);
1951 ieee80211_recalc_ps(local, latency_usec);
1952 mutex_unlock(&local->iflist_mtx);
1953
1954 return 0;
1955 }
1956
1957 /* config hooks */
1958 static enum work_done_result
1959 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1960 struct sk_buff *skb)
1961 {
1962 if (!skb) {
1963 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1964 return WORK_DONE_DESTROY;
1965 }
1966
1967 if (wk->type == IEEE80211_WORK_AUTH) {
1968 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1969 return WORK_DONE_DESTROY;
1970 }
1971
1972 mutex_lock(&wk->sdata->u.mgd.mtx);
1973 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1974 mutex_unlock(&wk->sdata->u.mgd.mtx);
1975
1976 wk->type = IEEE80211_WORK_AUTH;
1977 wk->probe_auth.tries = 0;
1978 return WORK_DONE_REQUEUE;
1979 }
1980
1981 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1982 struct cfg80211_auth_request *req)
1983 {
1984 const u8 *ssid;
1985 struct ieee80211_work *wk;
1986 u16 auth_alg;
1987
1988 if (req->local_state_change)
1989 return 0; /* no need to update mac80211 state */
1990
1991 switch (req->auth_type) {
1992 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1993 auth_alg = WLAN_AUTH_OPEN;
1994 break;
1995 case NL80211_AUTHTYPE_SHARED_KEY:
1996 auth_alg = WLAN_AUTH_SHARED_KEY;
1997 break;
1998 case NL80211_AUTHTYPE_FT:
1999 auth_alg = WLAN_AUTH_FT;
2000 break;
2001 case NL80211_AUTHTYPE_NETWORK_EAP:
2002 auth_alg = WLAN_AUTH_LEAP;
2003 break;
2004 default:
2005 return -EOPNOTSUPP;
2006 }
2007
2008 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2009 if (!wk)
2010 return -ENOMEM;
2011
2012 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2013
2014 if (req->ie && req->ie_len) {
2015 memcpy(wk->ie, req->ie, req->ie_len);
2016 wk->ie_len = req->ie_len;
2017 }
2018
2019 if (req->key && req->key_len) {
2020 wk->probe_auth.key_len = req->key_len;
2021 wk->probe_auth.key_idx = req->key_idx;
2022 memcpy(wk->probe_auth.key, req->key, req->key_len);
2023 }
2024
2025 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2026 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2027 wk->probe_auth.ssid_len = ssid[1];
2028
2029 wk->probe_auth.algorithm = auth_alg;
2030 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2031
2032 /* if we already have a probe, don't probe again */
2033 if (req->bss->proberesp_ies)
2034 wk->type = IEEE80211_WORK_AUTH;
2035 else
2036 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2037 wk->chan = req->bss->channel;
2038 wk->sdata = sdata;
2039 wk->done = ieee80211_probe_auth_done;
2040
2041 ieee80211_add_work(wk);
2042 return 0;
2043 }
2044
2045 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2046 struct sk_buff *skb)
2047 {
2048 struct ieee80211_mgmt *mgmt;
2049 u16 status;
2050
2051 if (!skb) {
2052 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2053 return WORK_DONE_DESTROY;
2054 }
2055
2056 mgmt = (void *)skb->data;
2057 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2058
2059 if (status == WLAN_STATUS_SUCCESS) {
2060 mutex_lock(&wk->sdata->u.mgd.mtx);
2061 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2062 mutex_unlock(&wk->sdata->u.mgd.mtx);
2063 /* oops -- internal error -- send timeout for now */
2064 cfg80211_send_assoc_timeout(wk->sdata->dev,
2065 wk->filter_ta);
2066 return WORK_DONE_DESTROY;
2067 }
2068
2069 mutex_unlock(&wk->sdata->u.mgd.mtx);
2070 }
2071
2072 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2073 return WORK_DONE_DESTROY;
2074 }
2075
2076 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2077 struct cfg80211_assoc_request *req)
2078 {
2079 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2080 struct ieee80211_bss *bss = (void *)req->bss->priv;
2081 struct ieee80211_work *wk;
2082 const u8 *ssid;
2083 int i;
2084
2085 mutex_lock(&ifmgd->mtx);
2086 if (ifmgd->associated) {
2087 if (!req->prev_bssid ||
2088 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2089 ETH_ALEN)) {
2090 /*
2091 * We are already associated and the request was not a
2092 * reassociation request from the current BSS, so
2093 * reject it.
2094 */
2095 mutex_unlock(&ifmgd->mtx);
2096 return -EALREADY;
2097 }
2098
2099 /* Trying to reassociate - clear previous association state */
2100 ieee80211_set_disassoc(sdata, true);
2101 }
2102 mutex_unlock(&ifmgd->mtx);
2103
2104 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2105 if (!wk)
2106 return -ENOMEM;
2107
2108 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2109 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2110
2111 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2112 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2113 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2114 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2115 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2116
2117
2118 if (req->ie && req->ie_len) {
2119 memcpy(wk->ie, req->ie, req->ie_len);
2120 wk->ie_len = req->ie_len;
2121 } else
2122 wk->ie_len = 0;
2123
2124 wk->assoc.bss = req->bss;
2125
2126 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2127
2128 /* new association always uses requested smps mode */
2129 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2130 if (ifmgd->powersave)
2131 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2132 else
2133 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2134 } else
2135 ifmgd->ap_smps = ifmgd->req_smps;
2136
2137 wk->assoc.smps = ifmgd->ap_smps;
2138 /*
2139 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2140 * We still associate in non-HT mode (11a/b/g) if any one of these
2141 * ciphers is configured as pairwise.
2142 * We can set this to true for non-11n hardware, that'll be checked
2143 * separately along with the peer capabilities.
2144 */
2145 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2146 wk->assoc.capability = req->bss->capability;
2147 wk->assoc.wmm_used = bss->wmm_used;
2148 wk->assoc.supp_rates = bss->supp_rates;
2149 wk->assoc.supp_rates_len = bss->supp_rates_len;
2150 wk->assoc.ht_information_ie =
2151 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2152
2153 if (bss->wmm_used && bss->uapsd_supported &&
2154 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2155 wk->assoc.uapsd_used = true;
2156 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2157 } else {
2158 wk->assoc.uapsd_used = false;
2159 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2160 }
2161
2162 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2163 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2164 wk->assoc.ssid_len = ssid[1];
2165
2166 if (req->prev_bssid)
2167 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2168
2169 wk->type = IEEE80211_WORK_ASSOC;
2170 wk->chan = req->bss->channel;
2171 wk->sdata = sdata;
2172 wk->done = ieee80211_assoc_done;
2173
2174 if (req->use_mfp) {
2175 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2176 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2177 } else {
2178 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2179 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2180 }
2181
2182 if (req->crypto.control_port)
2183 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2184 else
2185 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2186
2187 ieee80211_add_work(wk);
2188 return 0;
2189 }
2190
2191 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2192 struct cfg80211_deauth_request *req,
2193 void *cookie)
2194 {
2195 struct ieee80211_local *local = sdata->local;
2196 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2197 struct ieee80211_work *wk;
2198 u8 bssid[ETH_ALEN];
2199 bool assoc_bss = false;
2200
2201 mutex_lock(&ifmgd->mtx);
2202
2203 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2204 if (ifmgd->associated == req->bss) {
2205 ieee80211_set_disassoc(sdata, false);
2206 mutex_unlock(&ifmgd->mtx);
2207 assoc_bss = true;
2208 } else {
2209 bool not_auth_yet = false;
2210
2211 mutex_unlock(&ifmgd->mtx);
2212
2213 mutex_lock(&local->work_mtx);
2214 list_for_each_entry(wk, &local->work_list, list) {
2215 if (wk->sdata != sdata)
2216 continue;
2217
2218 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2219 wk->type != IEEE80211_WORK_AUTH &&
2220 wk->type != IEEE80211_WORK_ASSOC)
2221 continue;
2222
2223 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2224 continue;
2225
2226 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2227 list_del_rcu(&wk->list);
2228 free_work(wk);
2229 break;
2230 }
2231 mutex_unlock(&local->work_mtx);
2232
2233 /*
2234 * If somebody requests authentication and we haven't
2235 * sent out an auth frame yet there's no need to send
2236 * out a deauth frame either. If the state was PROBE,
2237 * then this is the case. If it's AUTH we have sent a
2238 * frame, and if it's IDLE we have completed the auth
2239 * process already.
2240 */
2241 if (not_auth_yet) {
2242 __cfg80211_auth_canceled(sdata->dev, bssid);
2243 return 0;
2244 }
2245 }
2246
2247 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2248 sdata->name, bssid, req->reason_code);
2249
2250 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2251 req->reason_code, cookie,
2252 !req->local_state_change);
2253 if (assoc_bss)
2254 sta_info_destroy_addr(sdata, bssid);
2255
2256 ieee80211_recalc_idle(sdata->local);
2257
2258 return 0;
2259 }
2260
2261 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2262 struct cfg80211_disassoc_request *req,
2263 void *cookie)
2264 {
2265 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2266 u8 bssid[ETH_ALEN];
2267
2268 mutex_lock(&ifmgd->mtx);
2269
2270 /*
2271 * cfg80211 should catch this ... but it's racy since
2272 * we can receive a disassoc frame, process it, hand it
2273 * to cfg80211 while that's in a locked section already
2274 * trying to tell us that the user wants to disconnect.
2275 */
2276 if (ifmgd->associated != req->bss) {
2277 mutex_unlock(&ifmgd->mtx);
2278 return -ENOLINK;
2279 }
2280
2281 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2282 sdata->name, req->bss->bssid, req->reason_code);
2283
2284 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2285 ieee80211_set_disassoc(sdata, false);
2286
2287 mutex_unlock(&ifmgd->mtx);
2288
2289 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2290 IEEE80211_STYPE_DISASSOC, req->reason_code,
2291 cookie, !req->local_state_change);
2292 sta_info_destroy_addr(sdata, bssid);
2293
2294 ieee80211_recalc_idle(sdata->local);
2295
2296 return 0;
2297 }
2298
2299 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2300 enum nl80211_cqm_rssi_threshold_event rssi_event,
2301 gfp_t gfp)
2302 {
2303 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2304
2305 trace_api_cqm_rssi_notify(sdata, rssi_event);
2306
2307 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2308 }
2309 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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