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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
[linux-2.6/next.git] / net / mac80211 / mlme.c
blob0839c4e8fd2e35b2042e968a9eddebb1e49dc99e
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->hw.conf.dynamic_ps_forced_timeout;
565 if (timeout < 0) {
566 /*
567 * The 2 second value is there for compatibility until
568 * the PM_QOS_NETWORK_LATENCY is configured with real
569 * values.
570 */
571 if (latency == 2000000000)
572 timeout = 100;
573 else if (latency <= 50000)
574 timeout = 300;
575 else if (latency <= 100000)
576 timeout = 100;
577 else if (latency <= 500000)
578 timeout = 50;
579 else
580 timeout = 0;
581 }
582 local->hw.conf.dynamic_ps_timeout = timeout;
583
584 if (beaconint_us > latency) {
585 local->ps_sdata = NULL;
586 } else {
587 struct ieee80211_bss *bss;
588 int maxslp = 1;
589 u8 dtimper;
590
591 bss = (void *)found->u.mgd.associated->priv;
592 dtimper = bss->dtim_period;
593
594 /* If the TIM IE is invalid, pretend the value is 1 */
595 if (!dtimper)
596 dtimper = 1;
597 else if (dtimper > 1)
598 maxslp = min_t(int, dtimper,
599 latency / beaconint_us);
600
601 local->hw.conf.max_sleep_period = maxslp;
602 local->hw.conf.ps_dtim_period = dtimper;
603 local->ps_sdata = found;
604 }
605 } else {
606 local->ps_sdata = NULL;
607 }
608
609 change:
610 ieee80211_change_ps(local);
611 }
612
613 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
614 {
615 struct ieee80211_local *local =
616 container_of(work, struct ieee80211_local,
617 dynamic_ps_disable_work);
618
619 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
620 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
621 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
622 }
623
624 ieee80211_wake_queues_by_reason(&local->hw,
625 IEEE80211_QUEUE_STOP_REASON_PS);
626 }
627
628 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
629 {
630 struct ieee80211_local *local =
631 container_of(work, struct ieee80211_local,
632 dynamic_ps_enable_work);
633 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
634 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
635
636 /* can only happen when PS was just disabled anyway */
637 if (!sdata)
638 return;
639
640 if (local->hw.conf.flags & IEEE80211_CONF_PS)
641 return;
642
643 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
644 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
645 ieee80211_send_nullfunc(local, sdata, 1);
646
647 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
648 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
649 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
650 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
651 local->hw.conf.flags |= IEEE80211_CONF_PS;
652 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
653 }
654 }
655
656 void ieee80211_dynamic_ps_timer(unsigned long data)
657 {
658 struct ieee80211_local *local = (void *) data;
659
660 if (local->quiescing || local->suspended)
661 return;
662
663 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
664 }
665
666 /* MLME */
667 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
668 struct ieee80211_if_managed *ifmgd,
669 u8 *wmm_param, size_t wmm_param_len)
670 {
671 struct ieee80211_tx_queue_params params;
672 size_t left;
673 int count;
674 u8 *pos, uapsd_queues = 0;
675
676 if (!local->ops->conf_tx)
677 return;
678
679 if (local->hw.queues < 4)
680 return;
681
682 if (!wmm_param)
683 return;
684
685 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
686 return;
687
688 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
689 uapsd_queues = local->uapsd_queues;
690
691 count = wmm_param[6] & 0x0f;
692 if (count == ifmgd->wmm_last_param_set)
693 return;
694 ifmgd->wmm_last_param_set = count;
695
696 pos = wmm_param + 8;
697 left = wmm_param_len - 8;
698
699 memset(&params, 0, sizeof(params));
700
701 local->wmm_acm = 0;
702 for (; left >= 4; left -= 4, pos += 4) {
703 int aci = (pos[0] >> 5) & 0x03;
704 int acm = (pos[0] >> 4) & 0x01;
705 bool uapsd = false;
706 int queue;
707
708 switch (aci) {
709 case 1: /* AC_BK */
710 queue = 3;
711 if (acm)
712 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
713 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
714 uapsd = true;
715 break;
716 case 2: /* AC_VI */
717 queue = 1;
718 if (acm)
719 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
720 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
721 uapsd = true;
722 break;
723 case 3: /* AC_VO */
724 queue = 0;
725 if (acm)
726 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
727 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
728 uapsd = true;
729 break;
730 case 0: /* AC_BE */
731 default:
732 queue = 2;
733 if (acm)
734 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
735 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
736 uapsd = true;
737 break;
738 }
739
740 params.aifs = pos[0] & 0x0f;
741 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
742 params.cw_min = ecw2cw(pos[1] & 0x0f);
743 params.txop = get_unaligned_le16(pos + 2);
744 params.uapsd = uapsd;
745
746 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
747 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
748 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
749 wiphy_name(local->hw.wiphy), queue, aci, acm,
750 params.aifs, params.cw_min, params.cw_max, params.txop,
751 params.uapsd);
752 #endif
753 if (drv_conf_tx(local, queue, &params))
754 printk(KERN_DEBUG "%s: failed to set TX queue "
755 "parameters for queue %d\n",
756 wiphy_name(local->hw.wiphy), queue);
757 }
758
759 /* enable WMM or activate new settings */
760 local->hw.conf.flags |= IEEE80211_CONF_QOS;
761 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
762 }
763
764 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
765 u16 capab, bool erp_valid, u8 erp)
766 {
767 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
768 u32 changed = 0;
769 bool use_protection;
770 bool use_short_preamble;
771 bool use_short_slot;
772
773 if (erp_valid) {
774 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
775 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
776 } else {
777 use_protection = false;
778 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
779 }
780
781 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
782 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
783 use_short_slot = true;
784
785 if (use_protection != bss_conf->use_cts_prot) {
786 bss_conf->use_cts_prot = use_protection;
787 changed |= BSS_CHANGED_ERP_CTS_PROT;
788 }
789
790 if (use_short_preamble != bss_conf->use_short_preamble) {
791 bss_conf->use_short_preamble = use_short_preamble;
792 changed |= BSS_CHANGED_ERP_PREAMBLE;
793 }
794
795 if (use_short_slot != bss_conf->use_short_slot) {
796 bss_conf->use_short_slot = use_short_slot;
797 changed |= BSS_CHANGED_ERP_SLOT;
798 }
799
800 return changed;
801 }
802
803 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
804 struct cfg80211_bss *cbss,
805 u32 bss_info_changed)
806 {
807 struct ieee80211_bss *bss = (void *)cbss->priv;
808 struct ieee80211_local *local = sdata->local;
809
810 bss_info_changed |= BSS_CHANGED_ASSOC;
811 /* set timing information */
812 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
813 sdata->vif.bss_conf.timestamp = cbss->tsf;
814
815 bss_info_changed |= BSS_CHANGED_BEACON_INT;
816 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
817 cbss->capability, bss->has_erp_value, bss->erp_value);
818
819 sdata->u.mgd.associated = cbss;
820 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
821
822 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
823
824 /* just to be sure */
825 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
826 IEEE80211_STA_BEACON_POLL);
827
828 /*
829 * Always handle WMM once after association regardless
830 * of the first value the AP uses. Setting -1 here has
831 * that effect because the AP values is an unsigned
832 * 4-bit value.
833 */
834 sdata->u.mgd.wmm_last_param_set = -1;
835
836 ieee80211_led_assoc(local, 1);
837
838 sdata->vif.bss_conf.assoc = 1;
839 /*
840 * For now just always ask the driver to update the basic rateset
841 * when we have associated, we aren't checking whether it actually
842 * changed or not.
843 */
844 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
845
846 /* And the BSSID changed - we're associated now */
847 bss_info_changed |= BSS_CHANGED_BSSID;
848
849 /* Tell the driver to monitor connection quality (if supported) */
850 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
851 sdata->vif.bss_conf.cqm_rssi_thold)
852 bss_info_changed |= BSS_CHANGED_CQM;
853
854 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
855
856 mutex_lock(&local->iflist_mtx);
857 ieee80211_recalc_ps(local, -1);
858 ieee80211_recalc_smps(local, sdata);
859 mutex_unlock(&local->iflist_mtx);
860
861 netif_tx_start_all_queues(sdata->dev);
862 netif_carrier_on(sdata->dev);
863 }
864
865 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
866 bool remove_sta)
867 {
868 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
869 struct ieee80211_local *local = sdata->local;
870 struct sta_info *sta;
871 u32 changed = 0, config_changed = 0;
872 u8 bssid[ETH_ALEN];
873
874 ASSERT_MGD_MTX(ifmgd);
875
876 if (WARN_ON(!ifmgd->associated))
877 return;
878
879 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
880
881 ifmgd->associated = NULL;
882 memset(ifmgd->bssid, 0, ETH_ALEN);
883
884 /*
885 * we need to commit the associated = NULL change because the
886 * scan code uses that to determine whether this iface should
887 * go to/wake up from powersave or not -- and could otherwise
888 * wake the queues erroneously.
889 */
890 smp_mb();
891
892 /*
893 * Thus, we can only afterwards stop the queues -- to account
894 * for the case where another CPU is finishing a scan at this
895 * time -- we don't want the scan code to enable queues.
896 */
897
898 netif_tx_stop_all_queues(sdata->dev);
899 netif_carrier_off(sdata->dev);
900
901 rcu_read_lock();
902 sta = sta_info_get(sdata, bssid);
903 if (sta) {
904 set_sta_flags(sta, WLAN_STA_DISASSOC);
905 ieee80211_sta_tear_down_BA_sessions(sta);
906 }
907 rcu_read_unlock();
908
909 changed |= ieee80211_reset_erp_info(sdata);
910
911 ieee80211_led_assoc(local, 0);
912 changed |= BSS_CHANGED_ASSOC;
913 sdata->vif.bss_conf.assoc = false;
914
915 ieee80211_set_wmm_default(sdata);
916
917 /* channel(_type) changes are handled by ieee80211_hw_config */
918 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
919
920 /* on the next assoc, re-program HT parameters */
921 sdata->ht_opmode_valid = false;
922
923 local->power_constr_level = 0;
924
925 del_timer_sync(&local->dynamic_ps_timer);
926 cancel_work_sync(&local->dynamic_ps_enable_work);
927
928 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
929 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
930 config_changed |= IEEE80211_CONF_CHANGE_PS;
931 }
932
933 ieee80211_hw_config(local, config_changed);
934
935 /* The BSSID (not really interesting) and HT changed */
936 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
937 ieee80211_bss_info_change_notify(sdata, changed);
938
939 if (remove_sta)
940 sta_info_destroy_addr(sdata, bssid);
941 }
942
943 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
944 struct ieee80211_hdr *hdr)
945 {
946 /*
947 * We can postpone the mgd.timer whenever receiving unicast frames
948 * from AP because we know that the connection is working both ways
949 * at that time. But multicast frames (and hence also beacons) must
950 * be ignored here, because we need to trigger the timer during
951 * data idle periods for sending the periodic probe request to the
952 * AP we're connected to.
953 */
954 if (is_multicast_ether_addr(hdr->addr1))
955 return;
956
957 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
958 return;
959
960 mod_timer(&sdata->u.mgd.conn_mon_timer,
961 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
962 }
963
964 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
965 {
966 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
967 const u8 *ssid;
968
969 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
970 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
971 ssid + 2, ssid[1], NULL, 0);
972
973 ifmgd->probe_send_count++;
974 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
975 run_again(ifmgd, ifmgd->probe_timeout);
976 }
977
978 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
979 bool beacon)
980 {
981 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
982 bool already = false;
983
984 if (!ieee80211_sdata_running(sdata))
985 return;
986
987 if (sdata->local->scanning)
988 return;
989
990 if (sdata->local->tmp_channel)
991 return;
992
993 mutex_lock(&ifmgd->mtx);
994
995 if (!ifmgd->associated)
996 goto out;
997
998 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
999 if (beacon && net_ratelimit())
1000 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1001 "- sending probe request\n", sdata->name);
1002 #endif
1003
1004 /*
1005 * The driver/our work has already reported this event or the
1006 * connection monitoring has kicked in and we have already sent
1007 * a probe request. Or maybe the AP died and the driver keeps
1008 * reporting until we disassociate...
1009 *
1010 * In either case we have to ignore the current call to this
1011 * function (except for setting the correct probe reason bit)
1012 * because otherwise we would reset the timer every time and
1013 * never check whether we received a probe response!
1014 */
1015 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1016 IEEE80211_STA_CONNECTION_POLL))
1017 already = true;
1018
1019 if (beacon)
1020 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1021 else
1022 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1023
1024 if (already)
1025 goto out;
1026
1027 mutex_lock(&sdata->local->iflist_mtx);
1028 ieee80211_recalc_ps(sdata->local, -1);
1029 mutex_unlock(&sdata->local->iflist_mtx);
1030
1031 ifmgd->probe_send_count = 0;
1032 ieee80211_mgd_probe_ap_send(sdata);
1033 out:
1034 mutex_unlock(&ifmgd->mtx);
1035 }
1036
1037 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1038 {
1039 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040 struct ieee80211_local *local = sdata->local;
1041 u8 bssid[ETH_ALEN];
1042
1043 mutex_lock(&ifmgd->mtx);
1044 if (!ifmgd->associated) {
1045 mutex_unlock(&ifmgd->mtx);
1046 return;
1047 }
1048
1049 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1050
1051 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1052
1053 ieee80211_set_disassoc(sdata, true);
1054 ieee80211_recalc_idle(local);
1055 mutex_unlock(&ifmgd->mtx);
1056 /*
1057 * must be outside lock due to cfg80211,
1058 * but that's not a problem.
1059 */
1060 ieee80211_send_deauth_disassoc(sdata, bssid,
1061 IEEE80211_STYPE_DEAUTH,
1062 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1063 NULL, true);
1064 }
1065
1066 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1067 {
1068 struct ieee80211_sub_if_data *sdata =
1069 container_of(work, struct ieee80211_sub_if_data,
1070 u.mgd.beacon_connection_loss_work);
1071
1072 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1073 __ieee80211_connection_loss(sdata);
1074 else
1075 ieee80211_mgd_probe_ap(sdata, true);
1076 }
1077
1078 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1079 {
1080 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1081 struct ieee80211_hw *hw = &sdata->local->hw;
1082
1083 trace_api_beacon_loss(sdata);
1084
1085 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1086 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1087 }
1088 EXPORT_SYMBOL(ieee80211_beacon_loss);
1089
1090 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1091 {
1092 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1093 struct ieee80211_hw *hw = &sdata->local->hw;
1094
1095 trace_api_connection_loss(sdata);
1096
1097 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1098 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1099 }
1100 EXPORT_SYMBOL(ieee80211_connection_loss);
1101
1102
1103 static enum rx_mgmt_action __must_check
1104 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1105 struct ieee80211_mgmt *mgmt, size_t len)
1106 {
1107 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108 const u8 *bssid = NULL;
1109 u16 reason_code;
1110
1111 if (len < 24 + 2)
1112 return RX_MGMT_NONE;
1113
1114 ASSERT_MGD_MTX(ifmgd);
1115
1116 bssid = ifmgd->associated->bssid;
1117
1118 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1119
1120 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1121 sdata->name, bssid, reason_code);
1122
1123 ieee80211_set_disassoc(sdata, true);
1124 ieee80211_recalc_idle(sdata->local);
1125
1126 return RX_MGMT_CFG80211_DEAUTH;
1127 }
1128
1129
1130 static enum rx_mgmt_action __must_check
1131 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1132 struct ieee80211_mgmt *mgmt, size_t len)
1133 {
1134 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1135 u16 reason_code;
1136
1137 if (len < 24 + 2)
1138 return RX_MGMT_NONE;
1139
1140 ASSERT_MGD_MTX(ifmgd);
1141
1142 if (WARN_ON(!ifmgd->associated))
1143 return RX_MGMT_NONE;
1144
1145 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1146 return RX_MGMT_NONE;
1147
1148 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1149
1150 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1151 sdata->name, mgmt->sa, reason_code);
1152
1153 ieee80211_set_disassoc(sdata, true);
1154 ieee80211_recalc_idle(sdata->local);
1155 return RX_MGMT_CFG80211_DISASSOC;
1156 }
1157
1158
1159 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1160 struct ieee80211_mgmt *mgmt, size_t len)
1161 {
1162 struct ieee80211_sub_if_data *sdata = wk->sdata;
1163 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1164 struct ieee80211_local *local = sdata->local;
1165 struct ieee80211_supported_band *sband;
1166 struct sta_info *sta;
1167 struct cfg80211_bss *cbss = wk->assoc.bss;
1168 u8 *pos;
1169 u32 rates, basic_rates;
1170 u16 capab_info, aid;
1171 struct ieee802_11_elems elems;
1172 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1173 u32 changed = 0;
1174 int i, j, err;
1175 bool have_higher_than_11mbit = false;
1176 u16 ap_ht_cap_flags;
1177
1178 /* AssocResp and ReassocResp have identical structure */
1179
1180 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1181 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1182
1183 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1184 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1185 "set\n", sdata->name, aid);
1186 aid &= ~(BIT(15) | BIT(14));
1187
1188 pos = mgmt->u.assoc_resp.variable;
1189 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1190
1191 if (!elems.supp_rates) {
1192 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1193 sdata->name);
1194 return false;
1195 }
1196
1197 ifmgd->aid = aid;
1198
1199 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1200 if (!sta) {
1201 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1202 " the AP\n", sdata->name);
1203 return false;
1204 }
1205
1206 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1207 WLAN_STA_ASSOC_AP);
1208 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1209 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1210
1211 rates = 0;
1212 basic_rates = 0;
1213 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1214
1215 for (i = 0; i < elems.supp_rates_len; i++) {
1216 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1217 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1218
1219 if (rate > 110)
1220 have_higher_than_11mbit = true;
1221
1222 for (j = 0; j < sband->n_bitrates; j++) {
1223 if (sband->bitrates[j].bitrate == rate) {
1224 rates |= BIT(j);
1225 if (is_basic)
1226 basic_rates |= BIT(j);
1227 break;
1228 }
1229 }
1230 }
1231
1232 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1233 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1234 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1235
1236 if (rate > 110)
1237 have_higher_than_11mbit = true;
1238
1239 for (j = 0; j < sband->n_bitrates; j++) {
1240 if (sband->bitrates[j].bitrate == rate) {
1241 rates |= BIT(j);
1242 if (is_basic)
1243 basic_rates |= BIT(j);
1244 break;
1245 }
1246 }
1247 }
1248
1249 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1250 sdata->vif.bss_conf.basic_rates = basic_rates;
1251
1252 /* cf. IEEE 802.11 9.2.12 */
1253 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1254 have_higher_than_11mbit)
1255 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1256 else
1257 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1258
1259 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1260 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1261 elems.ht_cap_elem, &sta->sta.ht_cap);
1262
1263 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1264
1265 rate_control_rate_init(sta);
1266
1267 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1268 set_sta_flags(sta, WLAN_STA_MFP);
1269
1270 if (elems.wmm_param)
1271 set_sta_flags(sta, WLAN_STA_WME);
1272
1273 err = sta_info_insert(sta);
1274 sta = NULL;
1275 if (err) {
1276 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1277 " the AP (error %d)\n", sdata->name, err);
1278 return false;
1279 }
1280
1281 if (elems.wmm_param)
1282 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1283 elems.wmm_param_len);
1284 else
1285 ieee80211_set_wmm_default(sdata);
1286
1287 local->oper_channel = wk->chan;
1288
1289 if (elems.ht_info_elem && elems.wmm_param &&
1290 (sdata->local->hw.queues >= 4) &&
1291 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1292 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1293 cbss->bssid, ap_ht_cap_flags);
1294
1295 /* set AID and assoc capability,
1296 * ieee80211_set_associated() will tell the driver */
1297 bss_conf->aid = aid;
1298 bss_conf->assoc_capability = capab_info;
1299 ieee80211_set_associated(sdata, cbss, changed);
1300
1301 /*
1302 * If we're using 4-addr mode, let the AP know that we're
1303 * doing so, so that it can create the STA VLAN on its side
1304 */
1305 if (ifmgd->use_4addr)
1306 ieee80211_send_4addr_nullfunc(local, sdata);
1307
1308 /*
1309 * Start timer to probe the connection to the AP now.
1310 * Also start the timer that will detect beacon loss.
1311 */
1312 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1313 mod_beacon_timer(sdata);
1314
1315 return true;
1316 }
1317
1318
1319 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1320 struct ieee80211_mgmt *mgmt,
1321 size_t len,
1322 struct ieee80211_rx_status *rx_status,
1323 struct ieee802_11_elems *elems,
1324 bool beacon)
1325 {
1326 struct ieee80211_local *local = sdata->local;
1327 int freq;
1328 struct ieee80211_bss *bss;
1329 struct ieee80211_channel *channel;
1330 bool need_ps = false;
1331
1332 if (sdata->u.mgd.associated) {
1333 bss = (void *)sdata->u.mgd.associated->priv;
1334 /* not previously set so we may need to recalc */
1335 need_ps = !bss->dtim_period;
1336 }
1337
1338 if (elems->ds_params && elems->ds_params_len == 1)
1339 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1340 else
1341 freq = rx_status->freq;
1342
1343 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1344
1345 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1346 return;
1347
1348 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1349 channel, beacon);
1350 if (bss)
1351 ieee80211_rx_bss_put(local, bss);
1352
1353 if (!sdata->u.mgd.associated)
1354 return;
1355
1356 if (need_ps) {
1357 mutex_lock(&local->iflist_mtx);
1358 ieee80211_recalc_ps(local, -1);
1359 mutex_unlock(&local->iflist_mtx);
1360 }
1361
1362 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1363 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1364 ETH_ALEN) == 0)) {
1365 struct ieee80211_channel_sw_ie *sw_elem =
1366 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1367 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1368 bss, rx_status->mactime);
1369 }
1370 }
1371
1372
1373 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1374 struct sk_buff *skb)
1375 {
1376 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1377 struct ieee80211_if_managed *ifmgd;
1378 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1379 size_t baselen, len = skb->len;
1380 struct ieee802_11_elems elems;
1381
1382 ifmgd = &sdata->u.mgd;
1383
1384 ASSERT_MGD_MTX(ifmgd);
1385
1386 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1387 return; /* ignore ProbeResp to foreign address */
1388
1389 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1390 if (baselen > len)
1391 return;
1392
1393 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1394 &elems);
1395
1396 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1397
1398 if (ifmgd->associated &&
1399 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1400 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1401 IEEE80211_STA_CONNECTION_POLL)) {
1402 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1403 IEEE80211_STA_BEACON_POLL);
1404 mutex_lock(&sdata->local->iflist_mtx);
1405 ieee80211_recalc_ps(sdata->local, -1);
1406 mutex_unlock(&sdata->local->iflist_mtx);
1407
1408 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1409 return;
1410
1411 /*
1412 * We've received a probe response, but are not sure whether
1413 * we have or will be receiving any beacons or data, so let's
1414 * schedule the timers again, just in case.
1415 */
1416 mod_beacon_timer(sdata);
1417
1418 mod_timer(&ifmgd->conn_mon_timer,
1419 round_jiffies_up(jiffies +
1420 IEEE80211_CONNECTION_IDLE_TIME));
1421 }
1422 }
1423
1424 /*
1425 * This is the canonical list of information elements we care about,
1426 * the filter code also gives us all changes to the Microsoft OUI
1427 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1428 *
1429 * We implement beacon filtering in software since that means we can
1430 * avoid processing the frame here and in cfg80211, and userspace
1431 * will not be able to tell whether the hardware supports it or not.
1432 *
1433 * XXX: This list needs to be dynamic -- userspace needs to be able to
1434 * add items it requires. It also needs to be able to tell us to
1435 * look out for other vendor IEs.
1436 */
1437 static const u64 care_about_ies =
1438 (1ULL << WLAN_EID_COUNTRY) |
1439 (1ULL << WLAN_EID_ERP_INFO) |
1440 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1441 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1442 (1ULL << WLAN_EID_HT_CAPABILITY) |
1443 (1ULL << WLAN_EID_HT_INFORMATION);
1444
1445 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1446 struct ieee80211_mgmt *mgmt,
1447 size_t len,
1448 struct ieee80211_rx_status *rx_status)
1449 {
1450 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1451 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1452 size_t baselen;
1453 struct ieee802_11_elems elems;
1454 struct ieee80211_local *local = sdata->local;
1455 u32 changed = 0;
1456 bool erp_valid, directed_tim = false;
1457 u8 erp_value = 0;
1458 u32 ncrc;
1459 u8 *bssid;
1460
1461 ASSERT_MGD_MTX(ifmgd);
1462
1463 /* Process beacon from the current BSS */
1464 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1465 if (baselen > len)
1466 return;
1467
1468 if (rx_status->freq != local->hw.conf.channel->center_freq)
1469 return;
1470
1471 /*
1472 * We might have received a number of frames, among them a
1473 * disassoc frame and a beacon...
1474 */
1475 if (!ifmgd->associated)
1476 return;
1477
1478 bssid = ifmgd->associated->bssid;
1479
1480 /*
1481 * And in theory even frames from a different AP we were just
1482 * associated to a split-second ago!
1483 */
1484 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1485 return;
1486
1487 /* Track average RSSI from the Beacon frames of the current AP */
1488 ifmgd->last_beacon_signal = rx_status->signal;
1489 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1490 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1491 ifmgd->ave_beacon_signal = rx_status->signal;
1492 ifmgd->last_cqm_event_signal = 0;
1493 } else {
1494 ifmgd->ave_beacon_signal =
1495 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1496 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1497 ifmgd->ave_beacon_signal) / 16;
1498 }
1499 if (bss_conf->cqm_rssi_thold &&
1500 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1501 int sig = ifmgd->ave_beacon_signal / 16;
1502 int last_event = ifmgd->last_cqm_event_signal;
1503 int thold = bss_conf->cqm_rssi_thold;
1504 int hyst = bss_conf->cqm_rssi_hyst;
1505 if (sig < thold &&
1506 (last_event == 0 || sig < last_event - hyst)) {
1507 ifmgd->last_cqm_event_signal = sig;
1508 ieee80211_cqm_rssi_notify(
1509 &sdata->vif,
1510 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1511 GFP_KERNEL);
1512 } else if (sig > thold &&
1513 (last_event == 0 || sig > last_event + hyst)) {
1514 ifmgd->last_cqm_event_signal = sig;
1515 ieee80211_cqm_rssi_notify(
1516 &sdata->vif,
1517 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1518 GFP_KERNEL);
1519 }
1520 }
1521
1522 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1523 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1524 if (net_ratelimit()) {
1525 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1526 "to a received beacon\n", sdata->name);
1527 }
1528 #endif
1529 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1530 mutex_lock(&local->iflist_mtx);
1531 ieee80211_recalc_ps(local, -1);
1532 mutex_unlock(&local->iflist_mtx);
1533 }
1534
1535 /*
1536 * Push the beacon loss detection into the future since
1537 * we are processing a beacon from the AP just now.
1538 */
1539 mod_beacon_timer(sdata);
1540
1541 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1542 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1543 len - baselen, &elems,
1544 care_about_ies, ncrc);
1545
1546 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1547 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1548 ifmgd->aid);
1549
1550 if (ncrc != ifmgd->beacon_crc) {
1551 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1552 true);
1553
1554 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1555 elems.wmm_param_len);
1556 }
1557
1558 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1559 if (directed_tim) {
1560 if (local->hw.conf.dynamic_ps_timeout > 0) {
1561 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1562 ieee80211_hw_config(local,
1563 IEEE80211_CONF_CHANGE_PS);
1564 ieee80211_send_nullfunc(local, sdata, 0);
1565 } else {
1566 local->pspolling = true;
1567
1568 /*
1569 * Here is assumed that the driver will be
1570 * able to send ps-poll frame and receive a
1571 * response even though power save mode is
1572 * enabled, but some drivers might require
1573 * to disable power save here. This needs
1574 * to be investigated.
1575 */
1576 ieee80211_send_pspoll(local, sdata);
1577 }
1578 }
1579 }
1580
1581 if (ncrc == ifmgd->beacon_crc)
1582 return;
1583 ifmgd->beacon_crc = ncrc;
1584
1585 if (elems.erp_info && elems.erp_info_len >= 1) {
1586 erp_valid = true;
1587 erp_value = elems.erp_info[0];
1588 } else {
1589 erp_valid = false;
1590 }
1591 changed |= ieee80211_handle_bss_capability(sdata,
1592 le16_to_cpu(mgmt->u.beacon.capab_info),
1593 erp_valid, erp_value);
1594
1595
1596 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1597 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1598 struct sta_info *sta;
1599 struct ieee80211_supported_band *sband;
1600 u16 ap_ht_cap_flags;
1601
1602 rcu_read_lock();
1603
1604 sta = sta_info_get(sdata, bssid);
1605 if (WARN_ON(!sta)) {
1606 rcu_read_unlock();
1607 return;
1608 }
1609
1610 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1611
1612 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1613 elems.ht_cap_elem, &sta->sta.ht_cap);
1614
1615 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1616
1617 rcu_read_unlock();
1618
1619 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1620 bssid, ap_ht_cap_flags);
1621 }
1622
1623 /* Note: country IE parsing is done for us by cfg80211 */
1624 if (elems.country_elem) {
1625 /* TODO: IBSS also needs this */
1626 if (elems.pwr_constr_elem)
1627 ieee80211_handle_pwr_constr(sdata,
1628 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1629 elems.pwr_constr_elem,
1630 elems.pwr_constr_elem_len);
1631 }
1632
1633 ieee80211_bss_info_change_notify(sdata, changed);
1634 }
1635
1636 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1637 struct sk_buff *skb)
1638 {
1639 struct ieee80211_local *local = sdata->local;
1640 struct ieee80211_mgmt *mgmt;
1641 u16 fc;
1642
1643 if (skb->len < 24)
1644 return RX_DROP_MONITOR;
1645
1646 mgmt = (struct ieee80211_mgmt *) skb->data;
1647 fc = le16_to_cpu(mgmt->frame_control);
1648
1649 switch (fc & IEEE80211_FCTL_STYPE) {
1650 case IEEE80211_STYPE_PROBE_RESP:
1651 case IEEE80211_STYPE_BEACON:
1652 case IEEE80211_STYPE_DEAUTH:
1653 case IEEE80211_STYPE_DISASSOC:
1654 case IEEE80211_STYPE_ACTION:
1655 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1656 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1657 return RX_QUEUED;
1658 }
1659
1660 return RX_DROP_MONITOR;
1661 }
1662
1663 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1664 struct sk_buff *skb)
1665 {
1666 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1667 struct ieee80211_rx_status *rx_status;
1668 struct ieee80211_mgmt *mgmt;
1669 enum rx_mgmt_action rma = RX_MGMT_NONE;
1670 u16 fc;
1671
1672 rx_status = (struct ieee80211_rx_status *) skb->cb;
1673 mgmt = (struct ieee80211_mgmt *) skb->data;
1674 fc = le16_to_cpu(mgmt->frame_control);
1675
1676 mutex_lock(&ifmgd->mtx);
1677
1678 if (ifmgd->associated &&
1679 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1680 switch (fc & IEEE80211_FCTL_STYPE) {
1681 case IEEE80211_STYPE_BEACON:
1682 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1683 rx_status);
1684 break;
1685 case IEEE80211_STYPE_PROBE_RESP:
1686 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1687 break;
1688 case IEEE80211_STYPE_DEAUTH:
1689 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1690 break;
1691 case IEEE80211_STYPE_DISASSOC:
1692 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1693 break;
1694 case IEEE80211_STYPE_ACTION:
1695 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1696 break;
1697
1698 ieee80211_sta_process_chanswitch(sdata,
1699 &mgmt->u.action.u.chan_switch.sw_elem,
1700 (void *)ifmgd->associated->priv,
1701 rx_status->mactime);
1702 break;
1703 }
1704 mutex_unlock(&ifmgd->mtx);
1705
1706 switch (rma) {
1707 case RX_MGMT_NONE:
1708 /* no action */
1709 break;
1710 case RX_MGMT_CFG80211_DEAUTH:
1711 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1712 break;
1713 case RX_MGMT_CFG80211_DISASSOC:
1714 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1715 break;
1716 default:
1717 WARN(1, "unexpected: %d", rma);
1718 }
1719 goto out;
1720 }
1721
1722 mutex_unlock(&ifmgd->mtx);
1723
1724 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1725 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1726 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1727
1728 out:
1729 kfree_skb(skb);
1730 }
1731
1732 static void ieee80211_sta_timer(unsigned long data)
1733 {
1734 struct ieee80211_sub_if_data *sdata =
1735 (struct ieee80211_sub_if_data *) data;
1736 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1737 struct ieee80211_local *local = sdata->local;
1738
1739 if (local->quiescing) {
1740 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1741 return;
1742 }
1743
1744 ieee80211_queue_work(&local->hw, &ifmgd->work);
1745 }
1746
1747 static void ieee80211_sta_work(struct work_struct *work)
1748 {
1749 struct ieee80211_sub_if_data *sdata =
1750 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1751 struct ieee80211_local *local = sdata->local;
1752 struct ieee80211_if_managed *ifmgd;
1753 struct sk_buff *skb;
1754
1755 if (!ieee80211_sdata_running(sdata))
1756 return;
1757
1758 if (local->scanning)
1759 return;
1760
1761 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1762 return;
1763
1764 /*
1765 * ieee80211_queue_work() should have picked up most cases,
1766 * here we'll pick the the rest.
1767 */
1768 if (WARN(local->suspended, "STA MLME work scheduled while "
1769 "going to suspend\n"))
1770 return;
1771
1772 ifmgd = &sdata->u.mgd;
1773
1774 /* first process frames to avoid timing out while a frame is pending */
1775 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1776 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1777
1778 /* then process the rest of the work */
1779 mutex_lock(&ifmgd->mtx);
1780
1781 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1782 IEEE80211_STA_CONNECTION_POLL) &&
1783 ifmgd->associated) {
1784 u8 bssid[ETH_ALEN];
1785
1786 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1787 if (time_is_after_jiffies(ifmgd->probe_timeout))
1788 run_again(ifmgd, ifmgd->probe_timeout);
1789
1790 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1791 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1792 printk(KERN_DEBUG "No probe response from AP %pM"
1793 " after %dms, try %d\n", bssid,
1794 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1795 ifmgd->probe_send_count);
1796 #endif
1797 ieee80211_mgd_probe_ap_send(sdata);
1798 } else {
1799 /*
1800 * We actually lost the connection ... or did we?
1801 * Let's make sure!
1802 */
1803 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1804 IEEE80211_STA_BEACON_POLL);
1805 printk(KERN_DEBUG "No probe response from AP %pM"
1806 " after %dms, disconnecting.\n",
1807 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1808 ieee80211_set_disassoc(sdata, true);
1809 ieee80211_recalc_idle(local);
1810 mutex_unlock(&ifmgd->mtx);
1811 /*
1812 * must be outside lock due to cfg80211,
1813 * but that's not a problem.
1814 */
1815 ieee80211_send_deauth_disassoc(sdata, bssid,
1816 IEEE80211_STYPE_DEAUTH,
1817 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1818 NULL, true);
1819 mutex_lock(&ifmgd->mtx);
1820 }
1821 }
1822
1823 mutex_unlock(&ifmgd->mtx);
1824 }
1825
1826 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1827 {
1828 struct ieee80211_sub_if_data *sdata =
1829 (struct ieee80211_sub_if_data *) data;
1830 struct ieee80211_local *local = sdata->local;
1831
1832 if (local->quiescing)
1833 return;
1834
1835 ieee80211_queue_work(&sdata->local->hw,
1836 &sdata->u.mgd.beacon_connection_loss_work);
1837 }
1838
1839 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1840 {
1841 struct ieee80211_sub_if_data *sdata =
1842 (struct ieee80211_sub_if_data *) data;
1843 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1844 struct ieee80211_local *local = sdata->local;
1845
1846 if (local->quiescing)
1847 return;
1848
1849 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1850 }
1851
1852 static void ieee80211_sta_monitor_work(struct work_struct *work)
1853 {
1854 struct ieee80211_sub_if_data *sdata =
1855 container_of(work, struct ieee80211_sub_if_data,
1856 u.mgd.monitor_work);
1857
1858 ieee80211_mgd_probe_ap(sdata, false);
1859 }
1860
1861 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1862 {
1863 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1864 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1865 IEEE80211_STA_CONNECTION_POLL);
1866
1867 /* let's probe the connection once */
1868 ieee80211_queue_work(&sdata->local->hw,
1869 &sdata->u.mgd.monitor_work);
1870 /* and do all the other regular work too */
1871 ieee80211_queue_work(&sdata->local->hw,
1872 &sdata->u.mgd.work);
1873 }
1874 }
1875
1876 #ifdef CONFIG_PM
1877 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1878 {
1879 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1880
1881 /*
1882 * we need to use atomic bitops for the running bits
1883 * only because both timers might fire at the same
1884 * time -- the code here is properly synchronised.
1885 */
1886
1887 cancel_work_sync(&ifmgd->work);
1888 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1889 if (del_timer_sync(&ifmgd->timer))
1890 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1891
1892 cancel_work_sync(&ifmgd->chswitch_work);
1893 if (del_timer_sync(&ifmgd->chswitch_timer))
1894 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1895
1896 cancel_work_sync(&ifmgd->monitor_work);
1897 /* these will just be re-established on connection */
1898 del_timer_sync(&ifmgd->conn_mon_timer);
1899 del_timer_sync(&ifmgd->bcn_mon_timer);
1900 }
1901
1902 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1903 {
1904 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1905
1906 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1907 add_timer(&ifmgd->timer);
1908 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1909 add_timer(&ifmgd->chswitch_timer);
1910 }
1911 #endif
1912
1913 /* interface setup */
1914 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1915 {
1916 struct ieee80211_if_managed *ifmgd;
1917
1918 ifmgd = &sdata->u.mgd;
1919 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1920 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1921 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1922 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1923 ieee80211_beacon_connection_loss_work);
1924 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1925 (unsigned long) sdata);
1926 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1927 (unsigned long) sdata);
1928 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1929 (unsigned long) sdata);
1930 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1931 (unsigned long) sdata);
1932 skb_queue_head_init(&ifmgd->skb_queue);
1933
1934 ifmgd->flags = 0;
1935
1936 mutex_init(&ifmgd->mtx);
1937
1938 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1939 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1940 else
1941 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1942 }
1943
1944 /* scan finished notification */
1945 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1946 {
1947 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1948
1949 /* Restart STA timers */
1950 rcu_read_lock();
1951 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1952 ieee80211_restart_sta_timer(sdata);
1953 rcu_read_unlock();
1954 }
1955
1956 int ieee80211_max_network_latency(struct notifier_block *nb,
1957 unsigned long data, void *dummy)
1958 {
1959 s32 latency_usec = (s32) data;
1960 struct ieee80211_local *local =
1961 container_of(nb, struct ieee80211_local,
1962 network_latency_notifier);
1963
1964 mutex_lock(&local->iflist_mtx);
1965 ieee80211_recalc_ps(local, latency_usec);
1966 mutex_unlock(&local->iflist_mtx);
1967
1968 return 0;
1969 }
1970
1971 /* config hooks */
1972 static enum work_done_result
1973 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1974 struct sk_buff *skb)
1975 {
1976 if (!skb) {
1977 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1978 return WORK_DONE_DESTROY;
1979 }
1980
1981 if (wk->type == IEEE80211_WORK_AUTH) {
1982 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1983 return WORK_DONE_DESTROY;
1984 }
1985
1986 mutex_lock(&wk->sdata->u.mgd.mtx);
1987 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1988 mutex_unlock(&wk->sdata->u.mgd.mtx);
1989
1990 wk->type = IEEE80211_WORK_AUTH;
1991 wk->probe_auth.tries = 0;
1992 return WORK_DONE_REQUEUE;
1993 }
1994
1995 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1996 struct cfg80211_auth_request *req)
1997 {
1998 const u8 *ssid;
1999 struct ieee80211_work *wk;
2000 u16 auth_alg;
2001
2002 if (req->local_state_change)
2003 return 0; /* no need to update mac80211 state */
2004
2005 switch (req->auth_type) {
2006 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2007 auth_alg = WLAN_AUTH_OPEN;
2008 break;
2009 case NL80211_AUTHTYPE_SHARED_KEY:
2010 auth_alg = WLAN_AUTH_SHARED_KEY;
2011 break;
2012 case NL80211_AUTHTYPE_FT:
2013 auth_alg = WLAN_AUTH_FT;
2014 break;
2015 case NL80211_AUTHTYPE_NETWORK_EAP:
2016 auth_alg = WLAN_AUTH_LEAP;
2017 break;
2018 default:
2019 return -EOPNOTSUPP;
2020 }
2021
2022 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2023 if (!wk)
2024 return -ENOMEM;
2025
2026 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2027
2028 if (req->ie && req->ie_len) {
2029 memcpy(wk->ie, req->ie, req->ie_len);
2030 wk->ie_len = req->ie_len;
2031 }
2032
2033 if (req->key && req->key_len) {
2034 wk->probe_auth.key_len = req->key_len;
2035 wk->probe_auth.key_idx = req->key_idx;
2036 memcpy(wk->probe_auth.key, req->key, req->key_len);
2037 }
2038
2039 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2040 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2041 wk->probe_auth.ssid_len = ssid[1];
2042
2043 wk->probe_auth.algorithm = auth_alg;
2044 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2045
2046 /* if we already have a probe, don't probe again */
2047 if (req->bss->proberesp_ies)
2048 wk->type = IEEE80211_WORK_AUTH;
2049 else
2050 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2051 wk->chan = req->bss->channel;
2052 wk->sdata = sdata;
2053 wk->done = ieee80211_probe_auth_done;
2054
2055 ieee80211_add_work(wk);
2056 return 0;
2057 }
2058
2059 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2060 struct sk_buff *skb)
2061 {
2062 struct ieee80211_mgmt *mgmt;
2063 u16 status;
2064
2065 if (!skb) {
2066 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2067 return WORK_DONE_DESTROY;
2068 }
2069
2070 mgmt = (void *)skb->data;
2071 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2072
2073 if (status == WLAN_STATUS_SUCCESS) {
2074 mutex_lock(&wk->sdata->u.mgd.mtx);
2075 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2076 mutex_unlock(&wk->sdata->u.mgd.mtx);
2077 /* oops -- internal error -- send timeout for now */
2078 cfg80211_send_assoc_timeout(wk->sdata->dev,
2079 wk->filter_ta);
2080 return WORK_DONE_DESTROY;
2081 }
2082 mutex_unlock(&wk->sdata->u.mgd.mtx);
2083 }
2084
2085 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2086 return WORK_DONE_DESTROY;
2087 }
2088
2089 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2090 struct cfg80211_assoc_request *req)
2091 {
2092 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2093 struct ieee80211_bss *bss = (void *)req->bss->priv;
2094 struct ieee80211_work *wk;
2095 const u8 *ssid;
2096 int i;
2097
2098 mutex_lock(&ifmgd->mtx);
2099 if (ifmgd->associated) {
2100 if (!req->prev_bssid ||
2101 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2102 ETH_ALEN)) {
2103 /*
2104 * We are already associated and the request was not a
2105 * reassociation request from the current BSS, so
2106 * reject it.
2107 */
2108 mutex_unlock(&ifmgd->mtx);
2109 return -EALREADY;
2110 }
2111
2112 /* Trying to reassociate - clear previous association state */
2113 ieee80211_set_disassoc(sdata, true);
2114 }
2115 mutex_unlock(&ifmgd->mtx);
2116
2117 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2118 if (!wk)
2119 return -ENOMEM;
2120
2121 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2122 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2123
2124 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2125 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2126 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2127 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2128 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2129
2130
2131 if (req->ie && req->ie_len) {
2132 memcpy(wk->ie, req->ie, req->ie_len);
2133 wk->ie_len = req->ie_len;
2134 } else
2135 wk->ie_len = 0;
2136
2137 wk->assoc.bss = req->bss;
2138
2139 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2140
2141 /* new association always uses requested smps mode */
2142 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2143 if (ifmgd->powersave)
2144 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2145 else
2146 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2147 } else
2148 ifmgd->ap_smps = ifmgd->req_smps;
2149
2150 wk->assoc.smps = ifmgd->ap_smps;
2151 /*
2152 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2153 * We still associate in non-HT mode (11a/b/g) if any one of these
2154 * ciphers is configured as pairwise.
2155 * We can set this to true for non-11n hardware, that'll be checked
2156 * separately along with the peer capabilities.
2157 */
2158 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2159 wk->assoc.capability = req->bss->capability;
2160 wk->assoc.wmm_used = bss->wmm_used;
2161 wk->assoc.supp_rates = bss->supp_rates;
2162 wk->assoc.supp_rates_len = bss->supp_rates_len;
2163 wk->assoc.ht_information_ie =
2164 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2165
2166 if (bss->wmm_used && bss->uapsd_supported &&
2167 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2168 wk->assoc.uapsd_used = true;
2169 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2170 } else {
2171 wk->assoc.uapsd_used = false;
2172 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2173 }
2174
2175 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2176 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2177 wk->assoc.ssid_len = ssid[1];
2178
2179 if (req->prev_bssid)
2180 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2181
2182 wk->type = IEEE80211_WORK_ASSOC;
2183 wk->chan = req->bss->channel;
2184 wk->sdata = sdata;
2185 wk->done = ieee80211_assoc_done;
2186
2187 if (req->use_mfp) {
2188 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2189 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2190 } else {
2191 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2192 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2193 }
2194
2195 if (req->crypto.control_port)
2196 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2197 else
2198 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2199
2200 ieee80211_add_work(wk);
2201 return 0;
2202 }
2203
2204 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2205 struct cfg80211_deauth_request *req,
2206 void *cookie)
2207 {
2208 struct ieee80211_local *local = sdata->local;
2209 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2210 struct ieee80211_work *wk;
2211 const u8 *bssid = req->bss->bssid;
2212
2213 mutex_lock(&ifmgd->mtx);
2214
2215 if (ifmgd->associated == req->bss) {
2216 bssid = req->bss->bssid;
2217 ieee80211_set_disassoc(sdata, true);
2218 mutex_unlock(&ifmgd->mtx);
2219 } else {
2220 bool not_auth_yet = false;
2221
2222 mutex_unlock(&ifmgd->mtx);
2223
2224 mutex_lock(&local->work_mtx);
2225 list_for_each_entry(wk, &local->work_list, list) {
2226 if (wk->sdata != sdata)
2227 continue;
2228
2229 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2230 wk->type != IEEE80211_WORK_AUTH &&
2231 wk->type != IEEE80211_WORK_ASSOC)
2232 continue;
2233
2234 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2235 continue;
2236
2237 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2238 list_del_rcu(&wk->list);
2239 free_work(wk);
2240 break;
2241 }
2242 mutex_unlock(&local->work_mtx);
2243
2244 /*
2245 * If somebody requests authentication and we haven't
2246 * sent out an auth frame yet there's no need to send
2247 * out a deauth frame either. If the state was PROBE,
2248 * then this is the case. If it's AUTH we have sent a
2249 * frame, and if it's IDLE we have completed the auth
2250 * process already.
2251 */
2252 if (not_auth_yet) {
2253 __cfg80211_auth_canceled(sdata->dev, bssid);
2254 return 0;
2255 }
2256 }
2257
2258 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2259 sdata->name, bssid, req->reason_code);
2260
2261 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2262 req->reason_code, cookie,
2263 !req->local_state_change);
2264
2265 ieee80211_recalc_idle(sdata->local);
2266
2267 return 0;
2268 }
2269
2270 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2271 struct cfg80211_disassoc_request *req,
2272 void *cookie)
2273 {
2274 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2275 u8 bssid[ETH_ALEN];
2276
2277 mutex_lock(&ifmgd->mtx);
2278
2279 /*
2280 * cfg80211 should catch this ... but it's racy since
2281 * we can receive a disassoc frame, process it, hand it
2282 * to cfg80211 while that's in a locked section already
2283 * trying to tell us that the user wants to disconnect.
2284 */
2285 if (ifmgd->associated != req->bss) {
2286 mutex_unlock(&ifmgd->mtx);
2287 return -ENOLINK;
2288 }
2289
2290 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2291 sdata->name, req->bss->bssid, req->reason_code);
2292
2293 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2294 ieee80211_set_disassoc(sdata, false);
2295
2296 mutex_unlock(&ifmgd->mtx);
2297
2298 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2299 IEEE80211_STYPE_DISASSOC, req->reason_code,
2300 cookie, !req->local_state_change);
2301 sta_info_destroy_addr(sdata, bssid);
2302
2303 ieee80211_recalc_idle(sdata->local);
2304
2305 return 0;
2306 }
2307
2308 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2309 struct ieee80211_channel *chan,
2310 enum nl80211_channel_type channel_type,
2311 const u8 *buf, size_t len, u64 *cookie)
2312 {
2313 struct ieee80211_local *local = sdata->local;
2314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2315 struct sk_buff *skb;
2316
2317 /* Check that we are on the requested channel for transmission */
2318 if ((chan != local->tmp_channel ||
2319 channel_type != local->tmp_channel_type) &&
2320 (chan != local->oper_channel ||
2321 channel_type != local->_oper_channel_type))
2322 return -EBUSY;
2323
2324 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2325 if (!skb)
2326 return -ENOMEM;
2327 skb_reserve(skb, local->hw.extra_tx_headroom);
2328
2329 memcpy(skb_put(skb, len), buf, len);
2330
2331 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2332 IEEE80211_SKB_CB(skb)->flags |=
2333 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2334 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2335 IEEE80211_TX_CTL_REQ_TX_STATUS;
2336 skb->dev = sdata->dev;
2337 ieee80211_tx_skb(sdata, skb);
2338
2339 *cookie = (unsigned long) skb;
2340 return 0;
2341 }
2342
2343 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2344 enum nl80211_cqm_rssi_threshold_event rssi_event,
2345 gfp_t gfp)
2346 {
2347 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2348
2349 trace_api_cqm_rssi_notify(sdata, rssi_event);
2350
2351 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2352 }
2353 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
linux-next