?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: 6352/1: perf: fix event validation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blobb6c163ac22da39fd3327a30f77478e27cb81756c
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 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
482 {
483 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
484 struct ieee80211_local *local = sdata->local;
485 struct ieee80211_conf *conf = &local->hw.conf;
486
487 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
488 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
489 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
490
491 local->disable_dynamic_ps = false;
492 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
493 }
494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
495
496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
497 {
498 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
499 struct ieee80211_local *local = sdata->local;
500 struct ieee80211_conf *conf = &local->hw.conf;
501
502 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
503 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
504 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
505
506 local->disable_dynamic_ps = true;
507 conf->dynamic_ps_timeout = 0;
508 del_timer_sync(&local->dynamic_ps_timer);
509 ieee80211_queue_work(&local->hw,
510 &local->dynamic_ps_enable_work);
511 }
512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
513
514 /* powersave */
515 static void ieee80211_enable_ps(struct ieee80211_local *local,
516 struct ieee80211_sub_if_data *sdata)
517 {
518 struct ieee80211_conf *conf = &local->hw.conf;
519
520 /*
521 * If we are scanning right now then the parameters will
522 * take effect when scan finishes.
523 */
524 if (local->scanning)
525 return;
526
527 if (conf->dynamic_ps_timeout > 0 &&
528 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
529 mod_timer(&local->dynamic_ps_timer, jiffies +
530 msecs_to_jiffies(conf->dynamic_ps_timeout));
531 } else {
532 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
533 ieee80211_send_nullfunc(local, sdata, 1);
534
535 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
536 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
537 return;
538
539 conf->flags |= IEEE80211_CONF_PS;
540 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
541 }
542 }
543
544 static void ieee80211_change_ps(struct ieee80211_local *local)
545 {
546 struct ieee80211_conf *conf = &local->hw.conf;
547
548 if (local->ps_sdata) {
549 ieee80211_enable_ps(local, local->ps_sdata);
550 } else if (conf->flags & IEEE80211_CONF_PS) {
551 conf->flags &= ~IEEE80211_CONF_PS;
552 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
553 del_timer_sync(&local->dynamic_ps_timer);
554 cancel_work_sync(&local->dynamic_ps_enable_work);
555 }
556 }
557
558 /* need to hold RTNL or interface lock */
559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
560 {
561 struct ieee80211_sub_if_data *sdata, *found = NULL;
562 int count = 0;
563 int timeout;
564
565 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
566 local->ps_sdata = NULL;
567 return;
568 }
569
570 if (!list_empty(&local->work_list)) {
571 local->ps_sdata = NULL;
572 goto change;
573 }
574
575 list_for_each_entry(sdata, &local->interfaces, list) {
576 if (!ieee80211_sdata_running(sdata))
577 continue;
578 if (sdata->vif.type != NL80211_IFTYPE_STATION)
579 continue;
580 found = sdata;
581 count++;
582 }
583
584 if (count == 1 && found->u.mgd.powersave &&
585 found->u.mgd.associated &&
586 found->u.mgd.associated->beacon_ies &&
587 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
588 IEEE80211_STA_CONNECTION_POLL))) {
589 struct ieee80211_conf *conf = &local->hw.conf;
590 s32 beaconint_us;
591
592 if (latency < 0)
593 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
594
595 beaconint_us = ieee80211_tu_to_usec(
596 found->vif.bss_conf.beacon_int);
597
598 timeout = local->dynamic_ps_forced_timeout;
599 if (timeout < 0) {
600 /*
601 * Go to full PSM if the user configures a very low
602 * latency requirement.
603 * The 2 second value is there for compatibility until
604 * the PM_QOS_NETWORK_LATENCY is configured with real
605 * values.
606 */
607 if (latency > 1900000000 && latency != 2000000000)
608 timeout = 0;
609 else
610 timeout = 100;
611 }
612 local->dynamic_ps_user_timeout = timeout;
613 if (!local->disable_dynamic_ps)
614 conf->dynamic_ps_timeout =
615 local->dynamic_ps_user_timeout;
616
617 if (beaconint_us > latency) {
618 local->ps_sdata = NULL;
619 } else {
620 struct ieee80211_bss *bss;
621 int maxslp = 1;
622 u8 dtimper;
623
624 bss = (void *)found->u.mgd.associated->priv;
625 dtimper = bss->dtim_period;
626
627 /* If the TIM IE is invalid, pretend the value is 1 */
628 if (!dtimper)
629 dtimper = 1;
630 else if (dtimper > 1)
631 maxslp = min_t(int, dtimper,
632 latency / beaconint_us);
633
634 local->hw.conf.max_sleep_period = maxslp;
635 local->hw.conf.ps_dtim_period = dtimper;
636 local->ps_sdata = found;
637 }
638 } else {
639 local->ps_sdata = NULL;
640 }
641
642 change:
643 ieee80211_change_ps(local);
644 }
645
646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
647 {
648 struct ieee80211_local *local =
649 container_of(work, struct ieee80211_local,
650 dynamic_ps_disable_work);
651
652 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
653 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
655 }
656
657 ieee80211_wake_queues_by_reason(&local->hw,
658 IEEE80211_QUEUE_STOP_REASON_PS);
659 }
660
661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
662 {
663 struct ieee80211_local *local =
664 container_of(work, struct ieee80211_local,
665 dynamic_ps_enable_work);
666 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
667 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
668
669 /* can only happen when PS was just disabled anyway */
670 if (!sdata)
671 return;
672
673 if (local->hw.conf.flags & IEEE80211_CONF_PS)
674 return;
675
676 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
677 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
678 ieee80211_send_nullfunc(local, sdata, 1);
679
680 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
681 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
682 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
683 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
684 local->hw.conf.flags |= IEEE80211_CONF_PS;
685 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
686 }
687 }
688
689 void ieee80211_dynamic_ps_timer(unsigned long data)
690 {
691 struct ieee80211_local *local = (void *) data;
692
693 if (local->quiescing || local->suspended)
694 return;
695
696 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
697 }
698
699 /* MLME */
700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
701 struct ieee80211_sub_if_data *sdata,
702 u8 *wmm_param, size_t wmm_param_len)
703 {
704 struct ieee80211_tx_queue_params params;
705 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
706 size_t left;
707 int count;
708 u8 *pos, uapsd_queues = 0;
709
710 if (!local->ops->conf_tx)
711 return;
712
713 if (local->hw.queues < 4)
714 return;
715
716 if (!wmm_param)
717 return;
718
719 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
720 return;
721
722 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
723 uapsd_queues = local->uapsd_queues;
724
725 count = wmm_param[6] & 0x0f;
726 if (count == ifmgd->wmm_last_param_set)
727 return;
728 ifmgd->wmm_last_param_set = count;
729
730 pos = wmm_param + 8;
731 left = wmm_param_len - 8;
732
733 memset(&params, 0, sizeof(params));
734
735 local->wmm_acm = 0;
736 for (; left >= 4; left -= 4, pos += 4) {
737 int aci = (pos[0] >> 5) & 0x03;
738 int acm = (pos[0] >> 4) & 0x01;
739 bool uapsd = false;
740 int queue;
741
742 switch (aci) {
743 case 1: /* AC_BK */
744 queue = 3;
745 if (acm)
746 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
747 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
748 uapsd = true;
749 break;
750 case 2: /* AC_VI */
751 queue = 1;
752 if (acm)
753 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
754 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
755 uapsd = true;
756 break;
757 case 3: /* AC_VO */
758 queue = 0;
759 if (acm)
760 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
761 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
762 uapsd = true;
763 break;
764 case 0: /* AC_BE */
765 default:
766 queue = 2;
767 if (acm)
768 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
769 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
770 uapsd = true;
771 break;
772 }
773
774 params.aifs = pos[0] & 0x0f;
775 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
776 params.cw_min = ecw2cw(pos[1] & 0x0f);
777 params.txop = get_unaligned_le16(pos + 2);
778 params.uapsd = uapsd;
779
780 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
781 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
782 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
783 wiphy_name(local->hw.wiphy), queue, aci, acm,
784 params.aifs, params.cw_min, params.cw_max, params.txop,
785 params.uapsd);
786 #endif
787 if (drv_conf_tx(local, queue, &params))
788 printk(KERN_DEBUG "%s: failed to set TX queue "
789 "parameters for queue %d\n",
790 wiphy_name(local->hw.wiphy), queue);
791 }
792
793 /* enable WMM or activate new settings */
794 sdata->vif.bss_conf.qos = true;
795 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
796 }
797
798 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
799 u16 capab, bool erp_valid, u8 erp)
800 {
801 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
802 u32 changed = 0;
803 bool use_protection;
804 bool use_short_preamble;
805 bool use_short_slot;
806
807 if (erp_valid) {
808 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
809 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
810 } else {
811 use_protection = false;
812 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
813 }
814
815 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
816 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
817 use_short_slot = true;
818
819 if (use_protection != bss_conf->use_cts_prot) {
820 bss_conf->use_cts_prot = use_protection;
821 changed |= BSS_CHANGED_ERP_CTS_PROT;
822 }
823
824 if (use_short_preamble != bss_conf->use_short_preamble) {
825 bss_conf->use_short_preamble = use_short_preamble;
826 changed |= BSS_CHANGED_ERP_PREAMBLE;
827 }
828
829 if (use_short_slot != bss_conf->use_short_slot) {
830 bss_conf->use_short_slot = use_short_slot;
831 changed |= BSS_CHANGED_ERP_SLOT;
832 }
833
834 return changed;
835 }
836
837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
838 struct cfg80211_bss *cbss,
839 u32 bss_info_changed)
840 {
841 struct ieee80211_bss *bss = (void *)cbss->priv;
842 struct ieee80211_local *local = sdata->local;
843 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
844
845 bss_info_changed |= BSS_CHANGED_ASSOC;
846 /* set timing information */
847 bss_conf->beacon_int = cbss->beacon_interval;
848 bss_conf->timestamp = cbss->tsf;
849
850 bss_info_changed |= BSS_CHANGED_BEACON_INT;
851 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
852 cbss->capability, bss->has_erp_value, bss->erp_value);
853
854 sdata->u.mgd.associated = cbss;
855 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
856
857 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
858
859 /* just to be sure */
860 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
861 IEEE80211_STA_BEACON_POLL);
862
863 /*
864 * Always handle WMM once after association regardless
865 * of the first value the AP uses. Setting -1 here has
866 * that effect because the AP values is an unsigned
867 * 4-bit value.
868 */
869 sdata->u.mgd.wmm_last_param_set = -1;
870
871 ieee80211_led_assoc(local, 1);
872
873 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
874 bss_conf->dtim_period = bss->dtim_period;
875 else
876 bss_conf->dtim_period = 0;
877
878 bss_conf->assoc = 1;
879 /*
880 * For now just always ask the driver to update the basic rateset
881 * when we have associated, we aren't checking whether it actually
882 * changed or not.
883 */
884 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
885
886 /* And the BSSID changed - we're associated now */
887 bss_info_changed |= BSS_CHANGED_BSSID;
888
889 /* Tell the driver to monitor connection quality (if supported) */
890 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
891 bss_conf->cqm_rssi_thold)
892 bss_info_changed |= BSS_CHANGED_CQM;
893
894 /* Enable ARP filtering */
895 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
896 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
897 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
898 }
899
900 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
901
902 mutex_lock(&local->iflist_mtx);
903 ieee80211_recalc_ps(local, -1);
904 ieee80211_recalc_smps(local, sdata);
905 mutex_unlock(&local->iflist_mtx);
906
907 netif_tx_start_all_queues(sdata->dev);
908 netif_carrier_on(sdata->dev);
909 }
910
911 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
912 bool remove_sta)
913 {
914 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
915 struct ieee80211_local *local = sdata->local;
916 struct sta_info *sta;
917 u32 changed = 0, config_changed = 0;
918 u8 bssid[ETH_ALEN];
919
920 ASSERT_MGD_MTX(ifmgd);
921
922 if (WARN_ON(!ifmgd->associated))
923 return;
924
925 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
926
927 ifmgd->associated = NULL;
928 memset(ifmgd->bssid, 0, ETH_ALEN);
929
930 /*
931 * we need to commit the associated = NULL change because the
932 * scan code uses that to determine whether this iface should
933 * go to/wake up from powersave or not -- and could otherwise
934 * wake the queues erroneously.
935 */
936 smp_mb();
937
938 /*
939 * Thus, we can only afterwards stop the queues -- to account
940 * for the case where another CPU is finishing a scan at this
941 * time -- we don't want the scan code to enable queues.
942 */
943
944 netif_tx_stop_all_queues(sdata->dev);
945 netif_carrier_off(sdata->dev);
946
947 mutex_lock(&local->sta_mtx);
948 sta = sta_info_get(sdata, bssid);
949 if (sta) {
950 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
951 ieee80211_sta_tear_down_BA_sessions(sta);
952 }
953 mutex_unlock(&local->sta_mtx);
954
955 changed |= ieee80211_reset_erp_info(sdata);
956
957 ieee80211_led_assoc(local, 0);
958 changed |= BSS_CHANGED_ASSOC;
959 sdata->vif.bss_conf.assoc = false;
960
961 ieee80211_set_wmm_default(sdata);
962
963 /* channel(_type) changes are handled by ieee80211_hw_config */
964 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
965
966 /* on the next assoc, re-program HT parameters */
967 sdata->ht_opmode_valid = false;
968
969 local->power_constr_level = 0;
970
971 del_timer_sync(&local->dynamic_ps_timer);
972 cancel_work_sync(&local->dynamic_ps_enable_work);
973
974 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
975 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
976 config_changed |= IEEE80211_CONF_CHANGE_PS;
977 }
978
979 ieee80211_hw_config(local, config_changed);
980
981 /* Disable ARP filtering */
982 if (sdata->vif.bss_conf.arp_filter_enabled) {
983 sdata->vif.bss_conf.arp_filter_enabled = false;
984 changed |= BSS_CHANGED_ARP_FILTER;
985 }
986
987 /* The BSSID (not really interesting) and HT changed */
988 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
989 ieee80211_bss_info_change_notify(sdata, changed);
990
991 if (remove_sta)
992 sta_info_destroy_addr(sdata, bssid);
993 }
994
995 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_hdr *hdr)
997 {
998 /*
999 * We can postpone the mgd.timer whenever receiving unicast frames
1000 * from AP because we know that the connection is working both ways
1001 * at that time. But multicast frames (and hence also beacons) must
1002 * be ignored here, because we need to trigger the timer during
1003 * data idle periods for sending the periodic probe request to the
1004 * AP we're connected to.
1005 */
1006 if (is_multicast_ether_addr(hdr->addr1))
1007 return;
1008
1009 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1010 return;
1011
1012 mod_timer(&sdata->u.mgd.conn_mon_timer,
1013 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1014 }
1015
1016 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1017 {
1018 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1019 const u8 *ssid;
1020
1021 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1022 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1023 ssid + 2, ssid[1], NULL, 0);
1024
1025 ifmgd->probe_send_count++;
1026 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1027 run_again(ifmgd, ifmgd->probe_timeout);
1028 }
1029
1030 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1031 bool beacon)
1032 {
1033 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1034 bool already = false;
1035
1036 if (!ieee80211_sdata_running(sdata))
1037 return;
1038
1039 if (sdata->local->scanning)
1040 return;
1041
1042 if (sdata->local->tmp_channel)
1043 return;
1044
1045 mutex_lock(&ifmgd->mtx);
1046
1047 if (!ifmgd->associated)
1048 goto out;
1049
1050 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1051 if (beacon && net_ratelimit())
1052 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1053 "- sending probe request\n", sdata->name);
1054 #endif
1055
1056 /*
1057 * The driver/our work has already reported this event or the
1058 * connection monitoring has kicked in and we have already sent
1059 * a probe request. Or maybe the AP died and the driver keeps
1060 * reporting until we disassociate...
1061 *
1062 * In either case we have to ignore the current call to this
1063 * function (except for setting the correct probe reason bit)
1064 * because otherwise we would reset the timer every time and
1065 * never check whether we received a probe response!
1066 */
1067 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1068 IEEE80211_STA_CONNECTION_POLL))
1069 already = true;
1070
1071 if (beacon)
1072 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1073 else
1074 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1075
1076 if (already)
1077 goto out;
1078
1079 mutex_lock(&sdata->local->iflist_mtx);
1080 ieee80211_recalc_ps(sdata->local, -1);
1081 mutex_unlock(&sdata->local->iflist_mtx);
1082
1083 ifmgd->probe_send_count = 0;
1084 ieee80211_mgd_probe_ap_send(sdata);
1085 out:
1086 mutex_unlock(&ifmgd->mtx);
1087 }
1088
1089 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1090 {
1091 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1092 struct ieee80211_local *local = sdata->local;
1093 u8 bssid[ETH_ALEN];
1094
1095 mutex_lock(&ifmgd->mtx);
1096 if (!ifmgd->associated) {
1097 mutex_unlock(&ifmgd->mtx);
1098 return;
1099 }
1100
1101 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1102
1103 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1104
1105 ieee80211_set_disassoc(sdata, true);
1106 ieee80211_recalc_idle(local);
1107 mutex_unlock(&ifmgd->mtx);
1108 /*
1109 * must be outside lock due to cfg80211,
1110 * but that's not a problem.
1111 */
1112 ieee80211_send_deauth_disassoc(sdata, bssid,
1113 IEEE80211_STYPE_DEAUTH,
1114 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1115 NULL, true);
1116 }
1117
1118 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1119 {
1120 struct ieee80211_sub_if_data *sdata =
1121 container_of(work, struct ieee80211_sub_if_data,
1122 u.mgd.beacon_connection_loss_work);
1123
1124 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1125 __ieee80211_connection_loss(sdata);
1126 else
1127 ieee80211_mgd_probe_ap(sdata, true);
1128 }
1129
1130 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1131 {
1132 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1133 struct ieee80211_hw *hw = &sdata->local->hw;
1134
1135 trace_api_beacon_loss(sdata);
1136
1137 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1138 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1139 }
1140 EXPORT_SYMBOL(ieee80211_beacon_loss);
1141
1142 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1143 {
1144 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1145 struct ieee80211_hw *hw = &sdata->local->hw;
1146
1147 trace_api_connection_loss(sdata);
1148
1149 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1150 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1151 }
1152 EXPORT_SYMBOL(ieee80211_connection_loss);
1153
1154
1155 static enum rx_mgmt_action __must_check
1156 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1157 struct ieee80211_mgmt *mgmt, size_t len)
1158 {
1159 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1160 const u8 *bssid = NULL;
1161 u16 reason_code;
1162
1163 if (len < 24 + 2)
1164 return RX_MGMT_NONE;
1165
1166 ASSERT_MGD_MTX(ifmgd);
1167
1168 bssid = ifmgd->associated->bssid;
1169
1170 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1171
1172 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1173 sdata->name, bssid, reason_code);
1174
1175 ieee80211_set_disassoc(sdata, true);
1176 ieee80211_recalc_idle(sdata->local);
1177
1178 return RX_MGMT_CFG80211_DEAUTH;
1179 }
1180
1181
1182 static enum rx_mgmt_action __must_check
1183 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1184 struct ieee80211_mgmt *mgmt, size_t len)
1185 {
1186 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1187 u16 reason_code;
1188
1189 if (len < 24 + 2)
1190 return RX_MGMT_NONE;
1191
1192 ASSERT_MGD_MTX(ifmgd);
1193
1194 if (WARN_ON(!ifmgd->associated))
1195 return RX_MGMT_NONE;
1196
1197 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1198 return RX_MGMT_NONE;
1199
1200 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1201
1202 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1203 sdata->name, mgmt->sa, reason_code);
1204
1205 ieee80211_set_disassoc(sdata, true);
1206 ieee80211_recalc_idle(sdata->local);
1207 return RX_MGMT_CFG80211_DISASSOC;
1208 }
1209
1210
1211 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1212 struct ieee80211_mgmt *mgmt, size_t len)
1213 {
1214 struct ieee80211_sub_if_data *sdata = wk->sdata;
1215 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1216 struct ieee80211_local *local = sdata->local;
1217 struct ieee80211_supported_band *sband;
1218 struct sta_info *sta;
1219 struct cfg80211_bss *cbss = wk->assoc.bss;
1220 u8 *pos;
1221 u32 rates, basic_rates;
1222 u16 capab_info, aid;
1223 struct ieee802_11_elems elems;
1224 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1225 u32 changed = 0;
1226 int i, j, err;
1227 bool have_higher_than_11mbit = false;
1228 u16 ap_ht_cap_flags;
1229
1230 /* AssocResp and ReassocResp have identical structure */
1231
1232 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1233 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1234
1235 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1236 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1237 "set\n", sdata->name, aid);
1238 aid &= ~(BIT(15) | BIT(14));
1239
1240 pos = mgmt->u.assoc_resp.variable;
1241 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1242
1243 if (!elems.supp_rates) {
1244 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1245 sdata->name);
1246 return false;
1247 }
1248
1249 ifmgd->aid = aid;
1250
1251 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1252 if (!sta) {
1253 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1254 " the AP\n", sdata->name);
1255 return false;
1256 }
1257
1258 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1259 WLAN_STA_ASSOC_AP);
1260 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1261 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1262
1263 rates = 0;
1264 basic_rates = 0;
1265 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1266
1267 for (i = 0; i < elems.supp_rates_len; i++) {
1268 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1269 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1270
1271 if (rate > 110)
1272 have_higher_than_11mbit = true;
1273
1274 for (j = 0; j < sband->n_bitrates; j++) {
1275 if (sband->bitrates[j].bitrate == rate) {
1276 rates |= BIT(j);
1277 if (is_basic)
1278 basic_rates |= BIT(j);
1279 break;
1280 }
1281 }
1282 }
1283
1284 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1285 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1286 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1287
1288 if (rate > 110)
1289 have_higher_than_11mbit = true;
1290
1291 for (j = 0; j < sband->n_bitrates; j++) {
1292 if (sband->bitrates[j].bitrate == rate) {
1293 rates |= BIT(j);
1294 if (is_basic)
1295 basic_rates |= BIT(j);
1296 break;
1297 }
1298 }
1299 }
1300
1301 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1302 sdata->vif.bss_conf.basic_rates = basic_rates;
1303
1304 /* cf. IEEE 802.11 9.2.12 */
1305 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1306 have_higher_than_11mbit)
1307 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1308 else
1309 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1310
1311 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1312 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1313 elems.ht_cap_elem, &sta->sta.ht_cap);
1314
1315 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1316
1317 rate_control_rate_init(sta);
1318
1319 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1320 set_sta_flags(sta, WLAN_STA_MFP);
1321
1322 if (elems.wmm_param)
1323 set_sta_flags(sta, WLAN_STA_WME);
1324
1325 err = sta_info_insert(sta);
1326 sta = NULL;
1327 if (err) {
1328 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1329 " the AP (error %d)\n", sdata->name, err);
1330 return false;
1331 }
1332
1333 if (elems.wmm_param)
1334 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1335 elems.wmm_param_len);
1336 else
1337 ieee80211_set_wmm_default(sdata);
1338
1339 local->oper_channel = wk->chan;
1340
1341 if (elems.ht_info_elem && elems.wmm_param &&
1342 (sdata->local->hw.queues >= 4) &&
1343 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1344 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1345 cbss->bssid, ap_ht_cap_flags);
1346
1347 /* set AID and assoc capability,
1348 * ieee80211_set_associated() will tell the driver */
1349 bss_conf->aid = aid;
1350 bss_conf->assoc_capability = capab_info;
1351 ieee80211_set_associated(sdata, cbss, changed);
1352
1353 /*
1354 * If we're using 4-addr mode, let the AP know that we're
1355 * doing so, so that it can create the STA VLAN on its side
1356 */
1357 if (ifmgd->use_4addr)
1358 ieee80211_send_4addr_nullfunc(local, sdata);
1359
1360 /*
1361 * Start timer to probe the connection to the AP now.
1362 * Also start the timer that will detect beacon loss.
1363 */
1364 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1365 mod_beacon_timer(sdata);
1366
1367 return true;
1368 }
1369
1370
1371 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1372 struct ieee80211_mgmt *mgmt,
1373 size_t len,
1374 struct ieee80211_rx_status *rx_status,
1375 struct ieee802_11_elems *elems,
1376 bool beacon)
1377 {
1378 struct ieee80211_local *local = sdata->local;
1379 int freq;
1380 struct ieee80211_bss *bss;
1381 struct ieee80211_channel *channel;
1382 bool need_ps = false;
1383
1384 if (sdata->u.mgd.associated) {
1385 bss = (void *)sdata->u.mgd.associated->priv;
1386 /* not previously set so we may need to recalc */
1387 need_ps = !bss->dtim_period;
1388 }
1389
1390 if (elems->ds_params && elems->ds_params_len == 1)
1391 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1392 else
1393 freq = rx_status->freq;
1394
1395 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1396
1397 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1398 return;
1399
1400 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1401 channel, beacon);
1402 if (bss)
1403 ieee80211_rx_bss_put(local, bss);
1404
1405 if (!sdata->u.mgd.associated)
1406 return;
1407
1408 if (need_ps) {
1409 mutex_lock(&local->iflist_mtx);
1410 ieee80211_recalc_ps(local, -1);
1411 mutex_unlock(&local->iflist_mtx);
1412 }
1413
1414 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1415 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1416 ETH_ALEN) == 0)) {
1417 struct ieee80211_channel_sw_ie *sw_elem =
1418 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1419 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1420 bss, rx_status->mactime);
1421 }
1422 }
1423
1424
1425 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1426 struct sk_buff *skb)
1427 {
1428 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1429 struct ieee80211_if_managed *ifmgd;
1430 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1431 size_t baselen, len = skb->len;
1432 struct ieee802_11_elems elems;
1433
1434 ifmgd = &sdata->u.mgd;
1435
1436 ASSERT_MGD_MTX(ifmgd);
1437
1438 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1439 return; /* ignore ProbeResp to foreign address */
1440
1441 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1442 if (baselen > len)
1443 return;
1444
1445 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1446 &elems);
1447
1448 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1449
1450 if (ifmgd->associated &&
1451 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1452 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1453 IEEE80211_STA_CONNECTION_POLL)) {
1454 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1455 IEEE80211_STA_BEACON_POLL);
1456 mutex_lock(&sdata->local->iflist_mtx);
1457 ieee80211_recalc_ps(sdata->local, -1);
1458 mutex_unlock(&sdata->local->iflist_mtx);
1459
1460 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1461 return;
1462
1463 /*
1464 * We've received a probe response, but are not sure whether
1465 * we have or will be receiving any beacons or data, so let's
1466 * schedule the timers again, just in case.
1467 */
1468 mod_beacon_timer(sdata);
1469
1470 mod_timer(&ifmgd->conn_mon_timer,
1471 round_jiffies_up(jiffies +
1472 IEEE80211_CONNECTION_IDLE_TIME));
1473 }
1474 }
1475
1476 /*
1477 * This is the canonical list of information elements we care about,
1478 * the filter code also gives us all changes to the Microsoft OUI
1479 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1480 *
1481 * We implement beacon filtering in software since that means we can
1482 * avoid processing the frame here and in cfg80211, and userspace
1483 * will not be able to tell whether the hardware supports it or not.
1484 *
1485 * XXX: This list needs to be dynamic -- userspace needs to be able to
1486 * add items it requires. It also needs to be able to tell us to
1487 * look out for other vendor IEs.
1488 */
1489 static const u64 care_about_ies =
1490 (1ULL << WLAN_EID_COUNTRY) |
1491 (1ULL << WLAN_EID_ERP_INFO) |
1492 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1493 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1494 (1ULL << WLAN_EID_HT_CAPABILITY) |
1495 (1ULL << WLAN_EID_HT_INFORMATION);
1496
1497 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1498 struct ieee80211_mgmt *mgmt,
1499 size_t len,
1500 struct ieee80211_rx_status *rx_status)
1501 {
1502 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1503 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1504 size_t baselen;
1505 struct ieee802_11_elems elems;
1506 struct ieee80211_local *local = sdata->local;
1507 u32 changed = 0;
1508 bool erp_valid, directed_tim = false;
1509 u8 erp_value = 0;
1510 u32 ncrc;
1511 u8 *bssid;
1512
1513 ASSERT_MGD_MTX(ifmgd);
1514
1515 /* Process beacon from the current BSS */
1516 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1517 if (baselen > len)
1518 return;
1519
1520 if (rx_status->freq != local->hw.conf.channel->center_freq)
1521 return;
1522
1523 /*
1524 * We might have received a number of frames, among them a
1525 * disassoc frame and a beacon...
1526 */
1527 if (!ifmgd->associated)
1528 return;
1529
1530 bssid = ifmgd->associated->bssid;
1531
1532 /*
1533 * And in theory even frames from a different AP we were just
1534 * associated to a split-second ago!
1535 */
1536 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1537 return;
1538
1539 /* Track average RSSI from the Beacon frames of the current AP */
1540 ifmgd->last_beacon_signal = rx_status->signal;
1541 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1542 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1543 ifmgd->ave_beacon_signal = rx_status->signal;
1544 ifmgd->last_cqm_event_signal = 0;
1545 } else {
1546 ifmgd->ave_beacon_signal =
1547 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1548 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1549 ifmgd->ave_beacon_signal) / 16;
1550 }
1551 if (bss_conf->cqm_rssi_thold &&
1552 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1553 int sig = ifmgd->ave_beacon_signal / 16;
1554 int last_event = ifmgd->last_cqm_event_signal;
1555 int thold = bss_conf->cqm_rssi_thold;
1556 int hyst = bss_conf->cqm_rssi_hyst;
1557 if (sig < thold &&
1558 (last_event == 0 || sig < last_event - hyst)) {
1559 ifmgd->last_cqm_event_signal = sig;
1560 ieee80211_cqm_rssi_notify(
1561 &sdata->vif,
1562 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1563 GFP_KERNEL);
1564 } else if (sig > thold &&
1565 (last_event == 0 || sig > last_event + hyst)) {
1566 ifmgd->last_cqm_event_signal = sig;
1567 ieee80211_cqm_rssi_notify(
1568 &sdata->vif,
1569 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1570 GFP_KERNEL);
1571 }
1572 }
1573
1574 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1576 if (net_ratelimit()) {
1577 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1578 "to a received beacon\n", sdata->name);
1579 }
1580 #endif
1581 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1582 mutex_lock(&local->iflist_mtx);
1583 ieee80211_recalc_ps(local, -1);
1584 mutex_unlock(&local->iflist_mtx);
1585 }
1586
1587 /*
1588 * Push the beacon loss detection into the future since
1589 * we are processing a beacon from the AP just now.
1590 */
1591 mod_beacon_timer(sdata);
1592
1593 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1594 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1595 len - baselen, &elems,
1596 care_about_ies, ncrc);
1597
1598 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1599 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1600 ifmgd->aid);
1601
1602 if (ncrc != ifmgd->beacon_crc) {
1603 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1604 true);
1605
1606 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1607 elems.wmm_param_len);
1608 }
1609
1610 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1611 if (directed_tim) {
1612 if (local->hw.conf.dynamic_ps_timeout > 0) {
1613 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1614 ieee80211_hw_config(local,
1615 IEEE80211_CONF_CHANGE_PS);
1616 ieee80211_send_nullfunc(local, sdata, 0);
1617 } else {
1618 local->pspolling = true;
1619
1620 /*
1621 * Here is assumed that the driver will be
1622 * able to send ps-poll frame and receive a
1623 * response even though power save mode is
1624 * enabled, but some drivers might require
1625 * to disable power save here. This needs
1626 * to be investigated.
1627 */
1628 ieee80211_send_pspoll(local, sdata);
1629 }
1630 }
1631 }
1632
1633 if (ncrc == ifmgd->beacon_crc)
1634 return;
1635 ifmgd->beacon_crc = ncrc;
1636
1637 if (elems.erp_info && elems.erp_info_len >= 1) {
1638 erp_valid = true;
1639 erp_value = elems.erp_info[0];
1640 } else {
1641 erp_valid = false;
1642 }
1643 changed |= ieee80211_handle_bss_capability(sdata,
1644 le16_to_cpu(mgmt->u.beacon.capab_info),
1645 erp_valid, erp_value);
1646
1647
1648 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1649 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1650 struct sta_info *sta;
1651 struct ieee80211_supported_band *sband;
1652 u16 ap_ht_cap_flags;
1653
1654 rcu_read_lock();
1655
1656 sta = sta_info_get(sdata, bssid);
1657 if (WARN_ON(!sta)) {
1658 rcu_read_unlock();
1659 return;
1660 }
1661
1662 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1663
1664 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1665 elems.ht_cap_elem, &sta->sta.ht_cap);
1666
1667 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1668
1669 rcu_read_unlock();
1670
1671 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1672 bssid, ap_ht_cap_flags);
1673 }
1674
1675 /* Note: country IE parsing is done for us by cfg80211 */
1676 if (elems.country_elem) {
1677 /* TODO: IBSS also needs this */
1678 if (elems.pwr_constr_elem)
1679 ieee80211_handle_pwr_constr(sdata,
1680 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1681 elems.pwr_constr_elem,
1682 elems.pwr_constr_elem_len);
1683 }
1684
1685 ieee80211_bss_info_change_notify(sdata, changed);
1686 }
1687
1688 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1689 struct sk_buff *skb)
1690 {
1691 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1692 struct ieee80211_rx_status *rx_status;
1693 struct ieee80211_mgmt *mgmt;
1694 enum rx_mgmt_action rma = RX_MGMT_NONE;
1695 u16 fc;
1696
1697 rx_status = (struct ieee80211_rx_status *) skb->cb;
1698 mgmt = (struct ieee80211_mgmt *) skb->data;
1699 fc = le16_to_cpu(mgmt->frame_control);
1700
1701 mutex_lock(&ifmgd->mtx);
1702
1703 if (ifmgd->associated &&
1704 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1705 switch (fc & IEEE80211_FCTL_STYPE) {
1706 case IEEE80211_STYPE_BEACON:
1707 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1708 rx_status);
1709 break;
1710 case IEEE80211_STYPE_PROBE_RESP:
1711 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1712 break;
1713 case IEEE80211_STYPE_DEAUTH:
1714 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1715 break;
1716 case IEEE80211_STYPE_DISASSOC:
1717 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1718 break;
1719 case IEEE80211_STYPE_ACTION:
1720 switch (mgmt->u.action.category) {
1721 case WLAN_CATEGORY_SPECTRUM_MGMT:
1722 ieee80211_sta_process_chanswitch(sdata,
1723 &mgmt->u.action.u.chan_switch.sw_elem,
1724 (void *)ifmgd->associated->priv,
1725 rx_status->mactime);
1726 break;
1727 }
1728 }
1729 mutex_unlock(&ifmgd->mtx);
1730
1731 switch (rma) {
1732 case RX_MGMT_NONE:
1733 /* no action */
1734 break;
1735 case RX_MGMT_CFG80211_DEAUTH:
1736 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1737 break;
1738 case RX_MGMT_CFG80211_DISASSOC:
1739 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1740 break;
1741 default:
1742 WARN(1, "unexpected: %d", rma);
1743 }
1744 return;
1745 }
1746
1747 mutex_unlock(&ifmgd->mtx);
1748
1749 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1750 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1751 struct ieee80211_local *local = sdata->local;
1752 struct ieee80211_work *wk;
1753
1754 mutex_lock(&local->work_mtx);
1755 list_for_each_entry(wk, &local->work_list, list) {
1756 if (wk->sdata != sdata)
1757 continue;
1758
1759 if (wk->type != IEEE80211_WORK_ASSOC &&
1760 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1761 continue;
1762
1763 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1764 continue;
1765 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1766 continue;
1767
1768 /*
1769 * Printing the message only here means we can't
1770 * spuriously print it, but it also means that it
1771 * won't be printed when the frame comes in before
1772 * we even tried to associate or in similar cases.
1773 *
1774 * Ultimately, I suspect cfg80211 should print the
1775 * messages instead.
1776 */
1777 printk(KERN_DEBUG
1778 "%s: deauthenticated from %pM (Reason: %u)\n",
1779 sdata->name, mgmt->bssid,
1780 le16_to_cpu(mgmt->u.deauth.reason_code));
1781
1782 list_del_rcu(&wk->list);
1783 free_work(wk);
1784 break;
1785 }
1786 mutex_unlock(&local->work_mtx);
1787
1788 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1789 }
1790 }
1791
1792 static void ieee80211_sta_timer(unsigned long data)
1793 {
1794 struct ieee80211_sub_if_data *sdata =
1795 (struct ieee80211_sub_if_data *) data;
1796 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1797 struct ieee80211_local *local = sdata->local;
1798
1799 if (local->quiescing) {
1800 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1801 return;
1802 }
1803
1804 ieee80211_queue_work(&local->hw, &sdata->work);
1805 }
1806
1807 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1808 {
1809 struct ieee80211_local *local = sdata->local;
1810 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1811
1812 /* then process the rest of the work */
1813 mutex_lock(&ifmgd->mtx);
1814
1815 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1816 IEEE80211_STA_CONNECTION_POLL) &&
1817 ifmgd->associated) {
1818 u8 bssid[ETH_ALEN];
1819
1820 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1821 if (time_is_after_jiffies(ifmgd->probe_timeout))
1822 run_again(ifmgd, ifmgd->probe_timeout);
1823
1824 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1825 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1826 printk(KERN_DEBUG "No probe response from AP %pM"
1827 " after %dms, try %d\n", bssid,
1828 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1829 ifmgd->probe_send_count);
1830 #endif
1831 ieee80211_mgd_probe_ap_send(sdata);
1832 } else {
1833 /*
1834 * We actually lost the connection ... or did we?
1835 * Let's make sure!
1836 */
1837 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1838 IEEE80211_STA_BEACON_POLL);
1839 printk(KERN_DEBUG "No probe response from AP %pM"
1840 " after %dms, disconnecting.\n",
1841 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1842 ieee80211_set_disassoc(sdata, true);
1843 ieee80211_recalc_idle(local);
1844 mutex_unlock(&ifmgd->mtx);
1845 /*
1846 * must be outside lock due to cfg80211,
1847 * but that's not a problem.
1848 */
1849 ieee80211_send_deauth_disassoc(sdata, bssid,
1850 IEEE80211_STYPE_DEAUTH,
1851 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1852 NULL, true);
1853 mutex_lock(&ifmgd->mtx);
1854 }
1855 }
1856
1857 mutex_unlock(&ifmgd->mtx);
1858 }
1859
1860 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1861 {
1862 struct ieee80211_sub_if_data *sdata =
1863 (struct ieee80211_sub_if_data *) data;
1864 struct ieee80211_local *local = sdata->local;
1865
1866 if (local->quiescing)
1867 return;
1868
1869 ieee80211_queue_work(&sdata->local->hw,
1870 &sdata->u.mgd.beacon_connection_loss_work);
1871 }
1872
1873 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1874 {
1875 struct ieee80211_sub_if_data *sdata =
1876 (struct ieee80211_sub_if_data *) data;
1877 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1878 struct ieee80211_local *local = sdata->local;
1879
1880 if (local->quiescing)
1881 return;
1882
1883 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1884 }
1885
1886 static void ieee80211_sta_monitor_work(struct work_struct *work)
1887 {
1888 struct ieee80211_sub_if_data *sdata =
1889 container_of(work, struct ieee80211_sub_if_data,
1890 u.mgd.monitor_work);
1891
1892 ieee80211_mgd_probe_ap(sdata, false);
1893 }
1894
1895 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1896 {
1897 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1898 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1899 IEEE80211_STA_CONNECTION_POLL);
1900
1901 /* let's probe the connection once */
1902 ieee80211_queue_work(&sdata->local->hw,
1903 &sdata->u.mgd.monitor_work);
1904 /* and do all the other regular work too */
1905 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1906 }
1907 }
1908
1909 #ifdef CONFIG_PM
1910 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1911 {
1912 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1913
1914 /*
1915 * we need to use atomic bitops for the running bits
1916 * only because both timers might fire at the same
1917 * time -- the code here is properly synchronised.
1918 */
1919
1920 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1921 if (del_timer_sync(&ifmgd->timer))
1922 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1923
1924 cancel_work_sync(&ifmgd->chswitch_work);
1925 if (del_timer_sync(&ifmgd->chswitch_timer))
1926 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1927
1928 cancel_work_sync(&ifmgd->monitor_work);
1929 /* these will just be re-established on connection */
1930 del_timer_sync(&ifmgd->conn_mon_timer);
1931 del_timer_sync(&ifmgd->bcn_mon_timer);
1932 }
1933
1934 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1935 {
1936 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1937
1938 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1939 add_timer(&ifmgd->timer);
1940 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1941 add_timer(&ifmgd->chswitch_timer);
1942 }
1943 #endif
1944
1945 /* interface setup */
1946 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1947 {
1948 struct ieee80211_if_managed *ifmgd;
1949
1950 ifmgd = &sdata->u.mgd;
1951 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1952 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1953 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1954 ieee80211_beacon_connection_loss_work);
1955 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1956 (unsigned long) sdata);
1957 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1958 (unsigned long) sdata);
1959 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1960 (unsigned long) sdata);
1961 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1962 (unsigned long) sdata);
1963
1964 ifmgd->flags = 0;
1965
1966 mutex_init(&ifmgd->mtx);
1967
1968 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1969 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1970 else
1971 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1972 }
1973
1974 /* scan finished notification */
1975 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1976 {
1977 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1978
1979 /* Restart STA timers */
1980 rcu_read_lock();
1981 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1982 ieee80211_restart_sta_timer(sdata);
1983 rcu_read_unlock();
1984 }
1985
1986 int ieee80211_max_network_latency(struct notifier_block *nb,
1987 unsigned long data, void *dummy)
1988 {
1989 s32 latency_usec = (s32) data;
1990 struct ieee80211_local *local =
1991 container_of(nb, struct ieee80211_local,
1992 network_latency_notifier);
1993
1994 mutex_lock(&local->iflist_mtx);
1995 ieee80211_recalc_ps(local, latency_usec);
1996 mutex_unlock(&local->iflist_mtx);
1997
1998 return 0;
1999 }
2000
2001 /* config hooks */
2002 static enum work_done_result
2003 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2004 struct sk_buff *skb)
2005 {
2006 if (!skb) {
2007 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2008 return WORK_DONE_DESTROY;
2009 }
2010
2011 if (wk->type == IEEE80211_WORK_AUTH) {
2012 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2013 return WORK_DONE_DESTROY;
2014 }
2015
2016 mutex_lock(&wk->sdata->u.mgd.mtx);
2017 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2018 mutex_unlock(&wk->sdata->u.mgd.mtx);
2019
2020 wk->type = IEEE80211_WORK_AUTH;
2021 wk->probe_auth.tries = 0;
2022 return WORK_DONE_REQUEUE;
2023 }
2024
2025 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2026 struct cfg80211_auth_request *req)
2027 {
2028 const u8 *ssid;
2029 struct ieee80211_work *wk;
2030 u16 auth_alg;
2031
2032 if (req->local_state_change)
2033 return 0; /* no need to update mac80211 state */
2034
2035 switch (req->auth_type) {
2036 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2037 auth_alg = WLAN_AUTH_OPEN;
2038 break;
2039 case NL80211_AUTHTYPE_SHARED_KEY:
2040 if (IS_ERR(sdata->local->wep_tx_tfm))
2041 return -EOPNOTSUPP;
2042 auth_alg = WLAN_AUTH_SHARED_KEY;
2043 break;
2044 case NL80211_AUTHTYPE_FT:
2045 auth_alg = WLAN_AUTH_FT;
2046 break;
2047 case NL80211_AUTHTYPE_NETWORK_EAP:
2048 auth_alg = WLAN_AUTH_LEAP;
2049 break;
2050 default:
2051 return -EOPNOTSUPP;
2052 }
2053
2054 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2055 if (!wk)
2056 return -ENOMEM;
2057
2058 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2059
2060 if (req->ie && req->ie_len) {
2061 memcpy(wk->ie, req->ie, req->ie_len);
2062 wk->ie_len = req->ie_len;
2063 }
2064
2065 if (req->key && req->key_len) {
2066 wk->probe_auth.key_len = req->key_len;
2067 wk->probe_auth.key_idx = req->key_idx;
2068 memcpy(wk->probe_auth.key, req->key, req->key_len);
2069 }
2070
2071 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2072 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2073 wk->probe_auth.ssid_len = ssid[1];
2074
2075 wk->probe_auth.algorithm = auth_alg;
2076 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2077
2078 /* if we already have a probe, don't probe again */
2079 if (req->bss->proberesp_ies)
2080 wk->type = IEEE80211_WORK_AUTH;
2081 else
2082 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2083 wk->chan = req->bss->channel;
2084 wk->sdata = sdata;
2085 wk->done = ieee80211_probe_auth_done;
2086
2087 ieee80211_add_work(wk);
2088 return 0;
2089 }
2090
2091 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2092 struct sk_buff *skb)
2093 {
2094 struct ieee80211_mgmt *mgmt;
2095 struct ieee80211_rx_status *rx_status;
2096 struct ieee802_11_elems elems;
2097 u16 status;
2098
2099 if (!skb) {
2100 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2101 return WORK_DONE_DESTROY;
2102 }
2103
2104 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2105 mutex_lock(&wk->sdata->u.mgd.mtx);
2106 rx_status = (void *) skb->cb;
2107 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2108 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2109 &elems, true);
2110 mutex_unlock(&wk->sdata->u.mgd.mtx);
2111
2112 wk->type = IEEE80211_WORK_ASSOC;
2113 /* not really done yet */
2114 return WORK_DONE_REQUEUE;
2115 }
2116
2117 mgmt = (void *)skb->data;
2118 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2119
2120 if (status == WLAN_STATUS_SUCCESS) {
2121 mutex_lock(&wk->sdata->u.mgd.mtx);
2122 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2123 mutex_unlock(&wk->sdata->u.mgd.mtx);
2124 /* oops -- internal error -- send timeout for now */
2125 cfg80211_send_assoc_timeout(wk->sdata->dev,
2126 wk->filter_ta);
2127 return WORK_DONE_DESTROY;
2128 }
2129
2130 mutex_unlock(&wk->sdata->u.mgd.mtx);
2131 }
2132
2133 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2134 return WORK_DONE_DESTROY;
2135 }
2136
2137 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2138 struct cfg80211_assoc_request *req)
2139 {
2140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141 struct ieee80211_bss *bss = (void *)req->bss->priv;
2142 struct ieee80211_work *wk;
2143 const u8 *ssid;
2144 int i;
2145
2146 mutex_lock(&ifmgd->mtx);
2147 if (ifmgd->associated) {
2148 if (!req->prev_bssid ||
2149 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2150 ETH_ALEN)) {
2151 /*
2152 * We are already associated and the request was not a
2153 * reassociation request from the current BSS, so
2154 * reject it.
2155 */
2156 mutex_unlock(&ifmgd->mtx);
2157 return -EALREADY;
2158 }
2159
2160 /* Trying to reassociate - clear previous association state */
2161 ieee80211_set_disassoc(sdata, true);
2162 }
2163 mutex_unlock(&ifmgd->mtx);
2164
2165 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2166 if (!wk)
2167 return -ENOMEM;
2168
2169 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2170 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2171
2172 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2173 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2174 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2175 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2176 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2177
2178
2179 if (req->ie && req->ie_len) {
2180 memcpy(wk->ie, req->ie, req->ie_len);
2181 wk->ie_len = req->ie_len;
2182 } else
2183 wk->ie_len = 0;
2184
2185 wk->assoc.bss = req->bss;
2186
2187 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2188
2189 /* new association always uses requested smps mode */
2190 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2191 if (ifmgd->powersave)
2192 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2193 else
2194 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2195 } else
2196 ifmgd->ap_smps = ifmgd->req_smps;
2197
2198 wk->assoc.smps = ifmgd->ap_smps;
2199 /*
2200 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2201 * We still associate in non-HT mode (11a/b/g) if any one of these
2202 * ciphers is configured as pairwise.
2203 * We can set this to true for non-11n hardware, that'll be checked
2204 * separately along with the peer capabilities.
2205 */
2206 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2207 wk->assoc.capability = req->bss->capability;
2208 wk->assoc.wmm_used = bss->wmm_used;
2209 wk->assoc.supp_rates = bss->supp_rates;
2210 wk->assoc.supp_rates_len = bss->supp_rates_len;
2211 wk->assoc.ht_information_ie =
2212 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2213
2214 if (bss->wmm_used && bss->uapsd_supported &&
2215 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2216 wk->assoc.uapsd_used = true;
2217 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2218 } else {
2219 wk->assoc.uapsd_used = false;
2220 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2221 }
2222
2223 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2224 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2225 wk->assoc.ssid_len = ssid[1];
2226
2227 if (req->prev_bssid)
2228 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2229
2230 wk->chan = req->bss->channel;
2231 wk->sdata = sdata;
2232 wk->done = ieee80211_assoc_done;
2233 if (!bss->dtim_period &&
2234 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2235 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2236 else
2237 wk->type = IEEE80211_WORK_ASSOC;
2238
2239 if (req->use_mfp) {
2240 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2241 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2242 } else {
2243 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2244 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2245 }
2246
2247 if (req->crypto.control_port)
2248 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2249 else
2250 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2251
2252 ieee80211_add_work(wk);
2253 return 0;
2254 }
2255
2256 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2257 struct cfg80211_deauth_request *req,
2258 void *cookie)
2259 {
2260 struct ieee80211_local *local = sdata->local;
2261 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262 struct ieee80211_work *wk;
2263 u8 bssid[ETH_ALEN];
2264 bool assoc_bss = false;
2265
2266 mutex_lock(&ifmgd->mtx);
2267
2268 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2269 if (ifmgd->associated == req->bss) {
2270 ieee80211_set_disassoc(sdata, false);
2271 mutex_unlock(&ifmgd->mtx);
2272 assoc_bss = true;
2273 } else {
2274 bool not_auth_yet = false;
2275
2276 mutex_unlock(&ifmgd->mtx);
2277
2278 mutex_lock(&local->work_mtx);
2279 list_for_each_entry(wk, &local->work_list, list) {
2280 if (wk->sdata != sdata)
2281 continue;
2282
2283 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2284 wk->type != IEEE80211_WORK_AUTH &&
2285 wk->type != IEEE80211_WORK_ASSOC &&
2286 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2287 continue;
2288
2289 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2290 continue;
2291
2292 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2293 list_del_rcu(&wk->list);
2294 free_work(wk);
2295 break;
2296 }
2297 mutex_unlock(&local->work_mtx);
2298
2299 /*
2300 * If somebody requests authentication and we haven't
2301 * sent out an auth frame yet there's no need to send
2302 * out a deauth frame either. If the state was PROBE,
2303 * then this is the case. If it's AUTH we have sent a
2304 * frame, and if it's IDLE we have completed the auth
2305 * process already.
2306 */
2307 if (not_auth_yet) {
2308 __cfg80211_auth_canceled(sdata->dev, bssid);
2309 return 0;
2310 }
2311 }
2312
2313 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2314 sdata->name, bssid, req->reason_code);
2315
2316 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2317 req->reason_code, cookie,
2318 !req->local_state_change);
2319 if (assoc_bss)
2320 sta_info_destroy_addr(sdata, bssid);
2321
2322 ieee80211_recalc_idle(sdata->local);
2323
2324 return 0;
2325 }
2326
2327 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2328 struct cfg80211_disassoc_request *req,
2329 void *cookie)
2330 {
2331 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2332 u8 bssid[ETH_ALEN];
2333
2334 mutex_lock(&ifmgd->mtx);
2335
2336 /*
2337 * cfg80211 should catch this ... but it's racy since
2338 * we can receive a disassoc frame, process it, hand it
2339 * to cfg80211 while that's in a locked section already
2340 * trying to tell us that the user wants to disconnect.
2341 */
2342 if (ifmgd->associated != req->bss) {
2343 mutex_unlock(&ifmgd->mtx);
2344 return -ENOLINK;
2345 }
2346
2347 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2348 sdata->name, req->bss->bssid, req->reason_code);
2349
2350 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2351 ieee80211_set_disassoc(sdata, false);
2352
2353 mutex_unlock(&ifmgd->mtx);
2354
2355 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2356 IEEE80211_STYPE_DISASSOC, req->reason_code,
2357 cookie, !req->local_state_change);
2358 sta_info_destroy_addr(sdata, bssid);
2359
2360 ieee80211_recalc_idle(sdata->local);
2361
2362 return 0;
2363 }
2364
2365 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2366 enum nl80211_cqm_rssi_threshold_event rssi_event,
2367 gfp_t gfp)
2368 {
2369 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2370
2371 trace_api_cqm_rssi_notify(sdata, rssi_event);
2372
2373 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2374 }
2375 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree